[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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[2725] | 3 | * A prototype Bourne shell grammar parser.
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| 4 | * Intended to follow the original Thompson and Ritchie
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| 5 | * "small and simple is beautiful" philosophy, which
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| 6 | * incidentally is a good match to today's BusyBox.
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[821] | 7 | *
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[2725] | 8 | * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
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| 9 | * Copyright (C) 2008,2009 Denys Vlasenko <vda.linux@googlemail.com>
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[821] | 10 | *
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[2725] | 11 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 12 | *
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[821] | 13 | * Credits:
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| 14 | * The parser routines proper are all original material, first
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| 15 | * written Dec 2000 and Jan 2001 by Larry Doolittle. The
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| 16 | * execution engine, the builtins, and much of the underlying
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| 17 | * support has been adapted from busybox-0.49pre's lash, which is
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| 18 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 19 | * written by Erik Andersen <andersen@codepoet.org>. That, in turn,
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| 20 | * is based in part on ladsh.c, by Michael K. Johnson and Erik W.
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| 21 | * Troan, which they placed in the public domain. I don't know
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| 22 | * how much of the Johnson/Troan code has survived the repeated
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| 23 | * rewrites.
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| 24 | *
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| 25 | * Other credits:
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[2725] | 26 | * o_addchr derived from similar w_addchar function in glibc-2.2.
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| 27 | * parse_redirect, redirect_opt_num, and big chunks of main
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| 28 | * and many builtins derived from contributions by Erik Andersen.
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| 29 | * Miscellaneous bugfixes from Matt Kraai.
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[821] | 30 | *
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| 31 | * There are two big (and related) architecture differences between
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| 32 | * this parser and the lash parser. One is that this version is
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| 33 | * actually designed from the ground up to understand nearly all
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| 34 | * of the Bourne grammar. The second, consequential change is that
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| 35 | * the parser and input reader have been turned inside out. Now,
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| 36 | * the parser is in control, and asks for input as needed. The old
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| 37 | * way had the input reader in control, and it asked for parsing to
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| 38 | * take place as needed. The new way makes it much easier to properly
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| 39 | * handle the recursion implicit in the various substitutions, especially
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| 40 | * across continuation lines.
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| 41 | *
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[2725] | 42 | * TODOs:
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| 43 | * grep for "TODO" and fix (some of them are easy)
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| 44 | * special variables (done: PWD, PPID, RANDOM)
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| 45 | * tilde expansion
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[821] | 46 | * aliases
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| 47 | * follow IFS rules more precisely, including update semantics
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[2725] | 48 | * builtins mandated by standards we don't support:
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| 49 | * [un]alias, command, fc, getopts, newgrp, readonly, times
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| 50 | * make complex ${var%...} constructs support optional
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| 51 | * make here documents optional
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[821] | 52 | *
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[2725] | 53 | * Bash compat TODO:
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| 54 | * redirection of stdout+stderr: &> and >&
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| 55 | * reserved words: function select
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| 56 | * advanced test: [[ ]]
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| 57 | * process substitution: <(list) and >(list)
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| 58 | * =~: regex operator
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| 59 | * let EXPR [EXPR...]
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| 60 | * Each EXPR is an arithmetic expression (ARITHMETIC EVALUATION)
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| 61 | * If the last arg evaluates to 0, let returns 1; 0 otherwise.
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| 62 | * NB: let `echo 'a=a + 1'` - error (IOW: multi-word expansion is used)
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| 63 | * ((EXPR))
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| 64 | * The EXPR is evaluated according to ARITHMETIC EVALUATION.
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| 65 | * This is exactly equivalent to let "EXPR".
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| 66 | * $[EXPR]: synonym for $((EXPR))
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| 67 | *
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| 68 | * Won't do:
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| 69 | * In bash, export builtin is special, its arguments are assignments
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| 70 | * and therefore expansion of them should be "one-word" expansion:
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| 71 | * $ export i=`echo 'a b'` # export has one arg: "i=a b"
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| 72 | * compare with:
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| 73 | * $ ls i=`echo 'a b'` # ls has two args: "i=a" and "b"
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| 74 | * ls: cannot access i=a: No such file or directory
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| 75 | * ls: cannot access b: No such file or directory
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| 76 | * Note1: same applies to local builtin.
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| 77 | * Note2: bash 3.2.33(1) does this only if export word itself
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| 78 | * is not quoted:
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| 79 | * $ export i=`echo 'aaa bbb'`; echo "$i"
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| 80 | * aaa bbb
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| 81 | * $ "export" i=`echo 'aaa bbb'`; echo "$i"
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| 82 | * aaa
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[821] | 83 | */
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[3232] | 84 | #if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
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| 85 | || defined(__APPLE__) \
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| 86 | )
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| 87 | # include <malloc.h> /* for malloc_trim */
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| 88 | #endif
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[2725] | 89 | #include <glob.h>
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| 90 | /* #include <dmalloc.h> */
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| 91 | #if ENABLE_HUSH_CASE
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| 92 | # include <fnmatch.h>
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| 93 | #endif
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[3621] | 94 | #include <sys/utsname.h> /* for setting $HOSTNAME */
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[821] | 95 |
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[3232] | 96 | #include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
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| 97 | #include "unicode.h"
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[2725] | 98 | #include "shell_common.h"
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| 99 | #include "math.h"
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| 100 | #include "match.h"
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| 101 | #if ENABLE_HUSH_RANDOM_SUPPORT
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| 102 | # include "random.h"
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| 103 | #else
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| 104 | # define CLEAR_RANDOM_T(rnd) ((void)0)
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| 105 | #endif
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| 106 | #ifndef PIPE_BUF
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| 107 | # define PIPE_BUF 4096 /* amount of buffering in a pipe */
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| 108 | #endif
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[1765] | 109 |
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[2725] | 110 | //config:config HUSH
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| 111 | //config: bool "hush"
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| 112 | //config: default y
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| 113 | //config: help
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| 114 | //config: hush is a small shell (25k). It handles the normal flow control
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| 115 | //config: constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
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| 116 | //config: case/esac. Redirections, here documents, $((arithmetic))
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| 117 | //config: and functions are supported.
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| 118 | //config:
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| 119 | //config: It will compile and work on no-mmu systems.
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| 120 | //config:
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| 121 | //config: It does not handle select, aliases, tilde expansion,
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| 122 | //config: &>file and >&file redirection of stdout+stderr.
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| 123 | //config:
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| 124 | //config:config HUSH_BASH_COMPAT
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| 125 | //config: bool "bash-compatible extensions"
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| 126 | //config: default y
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| 127 | //config: depends on HUSH
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| 128 | //config: help
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| 129 | //config: Enable bash-compatible extensions.
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| 130 | //config:
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| 131 | //config:config HUSH_BRACE_EXPANSION
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| 132 | //config: bool "Brace expansion"
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| 133 | //config: default y
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| 134 | //config: depends on HUSH_BASH_COMPAT
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| 135 | //config: help
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| 136 | //config: Enable {abc,def} extension.
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| 137 | //config:
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| 138 | //config:config HUSH_HELP
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| 139 | //config: bool "help builtin"
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| 140 | //config: default y
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| 141 | //config: depends on HUSH
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| 142 | //config: help
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| 143 | //config: Enable help builtin in hush. Code size + ~1 kbyte.
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| 144 | //config:
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| 145 | //config:config HUSH_INTERACTIVE
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| 146 | //config: bool "Interactive mode"
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| 147 | //config: default y
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| 148 | //config: depends on HUSH
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| 149 | //config: help
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| 150 | //config: Enable interactive mode (prompt and command editing).
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| 151 | //config: Without this, hush simply reads and executes commands
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| 152 | //config: from stdin just like a shell script from a file.
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| 153 | //config: No prompt, no PS1/PS2 magic shell variables.
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| 154 | //config:
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| 155 | //config:config HUSH_SAVEHISTORY
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| 156 | //config: bool "Save command history to .hush_history"
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| 157 | //config: default y
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| 158 | //config: depends on HUSH_INTERACTIVE && FEATURE_EDITING_SAVEHISTORY
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| 159 | //config: help
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| 160 | //config: Enable history saving in hush.
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| 161 | //config:
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| 162 | //config:config HUSH_JOB
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| 163 | //config: bool "Job control"
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| 164 | //config: default y
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| 165 | //config: depends on HUSH_INTERACTIVE
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| 166 | //config: help
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| 167 | //config: Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
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| 168 | //config: command (not entire shell), fg/bg builtins work. Without this option,
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| 169 | //config: "cmd &" still works by simply spawning a process and immediately
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| 170 | //config: prompting for next command (or executing next command in a script),
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| 171 | //config: but no separate process group is formed.
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| 172 | //config:
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| 173 | //config:config HUSH_TICK
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| 174 | //config: bool "Process substitution"
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| 175 | //config: default y
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| 176 | //config: depends on HUSH
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| 177 | //config: help
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| 178 | //config: Enable process substitution `command` and $(command) in hush.
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| 179 | //config:
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| 180 | //config:config HUSH_IF
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| 181 | //config: bool "Support if/then/elif/else/fi"
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| 182 | //config: default y
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| 183 | //config: depends on HUSH
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| 184 | //config: help
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| 185 | //config: Enable if/then/elif/else/fi in hush.
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| 186 | //config:
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| 187 | //config:config HUSH_LOOPS
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| 188 | //config: bool "Support for, while and until loops"
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| 189 | //config: default y
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| 190 | //config: depends on HUSH
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| 191 | //config: help
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| 192 | //config: Enable for, while and until loops in hush.
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| 193 | //config:
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| 194 | //config:config HUSH_CASE
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| 195 | //config: bool "Support case ... esac statement"
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| 196 | //config: default y
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| 197 | //config: depends on HUSH
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| 198 | //config: help
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| 199 | //config: Enable case ... esac statement in hush. +400 bytes.
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| 200 | //config:
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| 201 | //config:config HUSH_FUNCTIONS
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| 202 | //config: bool "Support funcname() { commands; } syntax"
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| 203 | //config: default y
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| 204 | //config: depends on HUSH
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| 205 | //config: help
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| 206 | //config: Enable support for shell functions in hush. +800 bytes.
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| 207 | //config:
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| 208 | //config:config HUSH_LOCAL
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| 209 | //config: bool "Support local builtin"
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| 210 | //config: default y
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| 211 | //config: depends on HUSH_FUNCTIONS
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| 212 | //config: help
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| 213 | //config: Enable support for local variables in functions.
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| 214 | //config:
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| 215 | //config:config HUSH_RANDOM_SUPPORT
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| 216 | //config: bool "Pseudorandom generator and $RANDOM variable"
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| 217 | //config: default y
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| 218 | //config: depends on HUSH
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| 219 | //config: help
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| 220 | //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
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| 221 | //config: Each read of "$RANDOM" will generate a new pseudorandom value.
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| 222 | //config:
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| 223 | //config:config HUSH_EXPORT_N
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| 224 | //config: bool "Support 'export -n' option"
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| 225 | //config: default y
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| 226 | //config: depends on HUSH
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| 227 | //config: help
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| 228 | //config: export -n unexports variables. It is a bash extension.
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| 229 | //config:
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| 230 | //config:config HUSH_MODE_X
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| 231 | //config: bool "Support 'hush -x' option and 'set -x' command"
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| 232 | //config: default y
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| 233 | //config: depends on HUSH
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| 234 | //config: help
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| 235 | //config: This instructs hush to print commands before execution.
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| 236 | //config: Adds ~300 bytes.
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| 237 | //config:
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| 238 | //config:config MSH
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| 239 | //config: bool "msh (deprecated: aliased to hush)"
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| 240 | //config: default n
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| 241 | //config: select HUSH
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| 242 | //config: help
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| 243 | //config: msh is deprecated and will be removed, please migrate to hush.
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| 244 | //config:
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[821] | 245 |
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[3232] | 246 | //applet:IF_HUSH(APPLET(hush, BB_DIR_BIN, BB_SUID_DROP))
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| 247 | //applet:IF_MSH(APPLET(msh, BB_DIR_BIN, BB_SUID_DROP))
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| 248 | //applet:IF_FEATURE_SH_IS_HUSH(APPLET_ODDNAME(sh, hush, BB_DIR_BIN, BB_SUID_DROP, sh))
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| 249 | //applet:IF_FEATURE_BASH_IS_HUSH(APPLET_ODDNAME(bash, hush, BB_DIR_BIN, BB_SUID_DROP, bash))
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[1765] | 250 |
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[3232] | 251 | //kbuild:lib-$(CONFIG_HUSH) += hush.o match.o shell_common.o
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| 252 | //kbuild:lib-$(CONFIG_HUSH_RANDOM_SUPPORT) += random.o
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[2725] | 253 |
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[3232] | 254 | /* -i (interactive) and -s (read stdin) are also accepted,
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| 255 | * but currently do nothing, therefore aren't shown in help.
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| 256 | * NOMMU-specific options are not meant to be used by users,
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| 257 | * therefore we don't show them either.
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| 258 | */
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| 259 | //usage:#define hush_trivial_usage
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| 260 | //usage: "[-nxl] [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
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| 261 | //usage:#define hush_full_usage "\n\n"
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| 262 | //usage: "Unix shell interpreter"
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| 263 |
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| 264 | //usage:#define msh_trivial_usage hush_trivial_usage
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| 265 | //usage:#define msh_full_usage hush_full_usage
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| 266 |
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| 267 | //usage:#if ENABLE_FEATURE_SH_IS_HUSH
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| 268 | //usage:# define sh_trivial_usage hush_trivial_usage
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| 269 | //usage:# define sh_full_usage hush_full_usage
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| 270 | //usage:#endif
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| 271 | //usage:#if ENABLE_FEATURE_BASH_IS_HUSH
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| 272 | //usage:# define bash_trivial_usage hush_trivial_usage
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| 273 | //usage:# define bash_full_usage hush_full_usage
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| 274 | //usage:#endif
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| 275 |
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| 276 |
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[2725] | 277 | /* Build knobs */
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| 278 | #define LEAK_HUNTING 0
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| 279 | #define BUILD_AS_NOMMU 0
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| 280 | /* Enable/disable sanity checks. Ok to enable in production,
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| 281 | * only adds a bit of bloat. Set to >1 to get non-production level verbosity.
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| 282 | * Keeping 1 for now even in released versions.
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| 283 | */
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| 284 | #define HUSH_DEBUG 1
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| 285 | /* Slightly bigger (+200 bytes), but faster hush.
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| 286 | * So far it only enables a trick with counting SIGCHLDs and forks,
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| 287 | * which allows us to do fewer waitpid's.
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| 288 | * (we can detect a case where neither forks were done nor SIGCHLDs happened
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| 289 | * and therefore waitpid will return the same result as last time)
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| 290 | */
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| 291 | #define ENABLE_HUSH_FAST 0
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| 292 | /* TODO: implement simplified code for users which do not need ${var%...} ops
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| 293 | * So far ${var%...} ops are always enabled:
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| 294 | */
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| 295 | #define ENABLE_HUSH_DOLLAR_OPS 1
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| 296 |
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| 297 |
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| 298 | #if BUILD_AS_NOMMU
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| 299 | # undef BB_MMU
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| 300 | # undef USE_FOR_NOMMU
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| 301 | # undef USE_FOR_MMU
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| 302 | # define BB_MMU 0
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| 303 | # define USE_FOR_NOMMU(...) __VA_ARGS__
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| 304 | # define USE_FOR_MMU(...)
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| 305 | #endif
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| 306 |
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| 307 | #include "NUM_APPLETS.h"
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| 308 | #if NUM_APPLETS == 1
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| 309 | /* STANDALONE does not make sense, and won't compile */
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| 310 | # undef CONFIG_FEATURE_SH_STANDALONE
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| 311 | # undef ENABLE_FEATURE_SH_STANDALONE
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| 312 | # undef IF_FEATURE_SH_STANDALONE
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| 313 | # undef IF_NOT_FEATURE_SH_STANDALONE
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| 314 | # define ENABLE_FEATURE_SH_STANDALONE 0
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| 315 | # define IF_FEATURE_SH_STANDALONE(...)
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| 316 | # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
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| 317 | #endif
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| 318 |
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| 319 | #if !ENABLE_HUSH_INTERACTIVE
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| 320 | # undef ENABLE_FEATURE_EDITING
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| 321 | # define ENABLE_FEATURE_EDITING 0
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| 322 | # undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
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| 323 | # define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
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[3232] | 324 | # undef ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
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| 325 | # define ENABLE_FEATURE_EDITING_SAVE_ON_EXIT 0
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[2725] | 326 | #endif
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| 327 |
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| 328 | /* Do we support ANY keywords? */
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| 329 | #if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
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| 330 | # define HAS_KEYWORDS 1
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| 331 | # define IF_HAS_KEYWORDS(...) __VA_ARGS__
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| 332 | # define IF_HAS_NO_KEYWORDS(...)
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| 333 | #else
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| 334 | # define HAS_KEYWORDS 0
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| 335 | # define IF_HAS_KEYWORDS(...)
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| 336 | # define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
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| 337 | #endif
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| 338 |
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[1765] | 339 | /* If you comment out one of these below, it will be #defined later
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| 340 | * to perform debug printfs to stderr: */
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| 341 | #define debug_printf(...) do {} while (0)
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| 342 | /* Finer-grained debug switches */
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| 343 | #define debug_printf_parse(...) do {} while (0)
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| 344 | #define debug_print_tree(a, b) do {} while (0)
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| 345 | #define debug_printf_exec(...) do {} while (0)
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[2725] | 346 | #define debug_printf_env(...) do {} while (0)
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[1765] | 347 | #define debug_printf_jobs(...) do {} while (0)
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| 348 | #define debug_printf_expand(...) do {} while (0)
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[2725] | 349 | #define debug_printf_varexp(...) do {} while (0)
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| 350 | #define debug_printf_glob(...) do {} while (0)
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| 351 | #define debug_printf_list(...) do {} while (0)
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| 352 | #define debug_printf_subst(...) do {} while (0)
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[1765] | 353 | #define debug_printf_clean(...) do {} while (0)
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| 354 |
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[2725] | 355 | #define ERR_PTR ((void*)(long)1)
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[821] | 356 |
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[2725] | 357 | #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
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[1765] | 358 |
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[2725] | 359 | #define _SPECIAL_VARS_STR "_*@$!?#"
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| 360 | #define SPECIAL_VARS_STR ("_*@$!?#" + 1)
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| 361 | #define NUMERIC_SPECVARS_STR ("_*@$!?#" + 3)
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| 362 | #if ENABLE_HUSH_BASH_COMPAT
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| 363 | /* Support / and // replace ops */
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| 364 | /* Note that // is stored as \ in "encoded" string representation */
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| 365 | # define VAR_ENCODED_SUBST_OPS "\\/%#:-=+?"
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| 366 | # define VAR_SUBST_OPS ("\\/%#:-=+?" + 1)
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| 367 | # define MINUS_PLUS_EQUAL_QUESTION ("\\/%#:-=+?" + 5)
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| 368 | #else
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| 369 | # define VAR_ENCODED_SUBST_OPS "%#:-=+?"
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| 370 | # define VAR_SUBST_OPS "%#:-=+?"
|
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| 371 | # define MINUS_PLUS_EQUAL_QUESTION ("%#:-=+?" + 3)
|
---|
[1765] | 372 | #endif
|
---|
| 373 |
|
---|
[2725] | 374 | #define SPECIAL_VAR_SYMBOL 3
|
---|
[1765] | 375 |
|
---|
[2725] | 376 | struct variable;
|
---|
[1765] | 377 |
|
---|
[2725] | 378 | static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="BB_VER;
|
---|
[1765] | 379 |
|
---|
[2725] | 380 | /* This supports saving pointers malloced in vfork child,
|
---|
| 381 | * to be freed in the parent.
|
---|
| 382 | */
|
---|
| 383 | #if !BB_MMU
|
---|
| 384 | typedef struct nommu_save_t {
|
---|
| 385 | char **new_env;
|
---|
| 386 | struct variable *old_vars;
|
---|
| 387 | char **argv;
|
---|
| 388 | char **argv_from_re_execing;
|
---|
| 389 | } nommu_save_t;
|
---|
[1765] | 390 | #endif
|
---|
| 391 |
|
---|
[2725] | 392 | enum {
|
---|
| 393 | RES_NONE = 0,
|
---|
| 394 | #if ENABLE_HUSH_IF
|
---|
| 395 | RES_IF ,
|
---|
| 396 | RES_THEN ,
|
---|
| 397 | RES_ELIF ,
|
---|
| 398 | RES_ELSE ,
|
---|
| 399 | RES_FI ,
|
---|
[1765] | 400 | #endif
|
---|
[2725] | 401 | #if ENABLE_HUSH_LOOPS
|
---|
| 402 | RES_FOR ,
|
---|
| 403 | RES_WHILE ,
|
---|
| 404 | RES_UNTIL ,
|
---|
| 405 | RES_DO ,
|
---|
| 406 | RES_DONE ,
|
---|
| 407 | #endif
|
---|
| 408 | #if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
|
---|
| 409 | RES_IN ,
|
---|
| 410 | #endif
|
---|
| 411 | #if ENABLE_HUSH_CASE
|
---|
| 412 | RES_CASE ,
|
---|
| 413 | /* three pseudo-keywords support contrived "case" syntax: */
|
---|
| 414 | RES_CASE_IN, /* "case ... IN", turns into RES_MATCH when IN is observed */
|
---|
| 415 | RES_MATCH , /* "word)" */
|
---|
| 416 | RES_CASE_BODY, /* "this command is inside CASE" */
|
---|
| 417 | RES_ESAC ,
|
---|
| 418 | #endif
|
---|
| 419 | RES_XXXX ,
|
---|
| 420 | RES_SNTX
|
---|
| 421 | };
|
---|
[1765] | 422 |
|
---|
[2725] | 423 | typedef struct o_string {
|
---|
| 424 | char *data;
|
---|
| 425 | int length; /* position where data is appended */
|
---|
| 426 | int maxlen;
|
---|
| 427 | int o_expflags;
|
---|
| 428 | /* At least some part of the string was inside '' or "",
|
---|
| 429 | * possibly empty one: word"", wo''rd etc. */
|
---|
| 430 | smallint has_quoted_part;
|
---|
| 431 | smallint has_empty_slot;
|
---|
| 432 | smallint o_assignment; /* 0:maybe, 1:yes, 2:no */
|
---|
| 433 | } o_string;
|
---|
| 434 | enum {
|
---|
| 435 | EXP_FLAG_SINGLEWORD = 0x80, /* must be 0x80 */
|
---|
| 436 | EXP_FLAG_GLOB = 0x2,
|
---|
| 437 | /* Protect newly added chars against globbing
|
---|
| 438 | * by prepending \ to *, ?, [, \ */
|
---|
| 439 | EXP_FLAG_ESC_GLOB_CHARS = 0x1,
|
---|
| 440 | };
|
---|
| 441 | enum {
|
---|
| 442 | MAYBE_ASSIGNMENT = 0,
|
---|
| 443 | DEFINITELY_ASSIGNMENT = 1,
|
---|
| 444 | NOT_ASSIGNMENT = 2,
|
---|
[3621] | 445 | /* Not an assignment, but next word may be: "if v=xyz cmd;" */
|
---|
[2725] | 446 | WORD_IS_KEYWORD = 3,
|
---|
| 447 | };
|
---|
| 448 | /* Used for initialization: o_string foo = NULL_O_STRING; */
|
---|
| 449 | #define NULL_O_STRING { NULL }
|
---|
[1765] | 450 |
|
---|
[2859] | 451 | #ifndef debug_printf_parse
|
---|
| 452 | static const char *const assignment_flag[] = {
|
---|
| 453 | "MAYBE_ASSIGNMENT",
|
---|
| 454 | "DEFINITELY_ASSIGNMENT",
|
---|
| 455 | "NOT_ASSIGNMENT",
|
---|
| 456 | "WORD_IS_KEYWORD",
|
---|
| 457 | };
|
---|
| 458 | #endif
|
---|
| 459 |
|
---|
[2725] | 460 | typedef struct in_str {
|
---|
| 461 | const char *p;
|
---|
| 462 | /* eof_flag=1: last char in ->p is really an EOF */
|
---|
| 463 | char eof_flag; /* meaningless if ->p == NULL */
|
---|
| 464 | char peek_buf[2];
|
---|
| 465 | #if ENABLE_HUSH_INTERACTIVE
|
---|
| 466 | smallint promptmode; /* 0: PS1, 1: PS2 */
|
---|
| 467 | #endif
|
---|
[3232] | 468 | int last_char;
|
---|
[2725] | 469 | FILE *file;
|
---|
| 470 | int (*get) (struct in_str *) FAST_FUNC;
|
---|
| 471 | int (*peek) (struct in_str *) FAST_FUNC;
|
---|
| 472 | } in_str;
|
---|
| 473 | #define i_getch(input) ((input)->get(input))
|
---|
| 474 | #define i_peek(input) ((input)->peek(input))
|
---|
[1765] | 475 |
|
---|
[2725] | 476 | /* The descrip member of this structure is only used to make
|
---|
| 477 | * debugging output pretty */
|
---|
[1765] | 478 | static const struct {
|
---|
| 479 | int mode;
|
---|
| 480 | signed char default_fd;
|
---|
| 481 | char descrip[3];
|
---|
| 482 | } redir_table[] = {
|
---|
[821] | 483 | { O_RDONLY, 0, "<" },
|
---|
| 484 | { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
|
---|
| 485 | { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
|
---|
[2725] | 486 | { O_CREAT|O_RDWR, 1, "<>" },
|
---|
| 487 | { O_RDONLY, 0, "<<" },
|
---|
| 488 | /* Should not be needed. Bogus default_fd helps in debugging */
|
---|
| 489 | /* { O_RDONLY, 77, "<<" }, */
|
---|
[821] | 490 | };
|
---|
| 491 |
|
---|
[2725] | 492 | struct redir_struct {
|
---|
| 493 | struct redir_struct *next;
|
---|
| 494 | char *rd_filename; /* filename */
|
---|
| 495 | int rd_fd; /* fd to redirect */
|
---|
| 496 | /* fd to redirect to, or -3 if rd_fd is to be closed (n>&-) */
|
---|
| 497 | int rd_dup;
|
---|
| 498 | smallint rd_type; /* (enum redir_type) */
|
---|
| 499 | /* note: for heredocs, rd_filename contains heredoc delimiter,
|
---|
| 500 | * and subsequently heredoc itself; and rd_dup is a bitmask:
|
---|
| 501 | * bit 0: do we need to trim leading tabs?
|
---|
| 502 | * bit 1: is heredoc quoted (<<'delim' syntax) ?
|
---|
| 503 | */
|
---|
| 504 | };
|
---|
| 505 | typedef enum redir_type {
|
---|
| 506 | REDIRECT_INPUT = 0,
|
---|
| 507 | REDIRECT_OVERWRITE = 1,
|
---|
| 508 | REDIRECT_APPEND = 2,
|
---|
| 509 | REDIRECT_IO = 3,
|
---|
| 510 | REDIRECT_HEREDOC = 4,
|
---|
| 511 | REDIRECT_HEREDOC2 = 5, /* REDIRECT_HEREDOC after heredoc is loaded */
|
---|
[821] | 512 |
|
---|
[2725] | 513 | REDIRFD_CLOSE = -3,
|
---|
| 514 | REDIRFD_SYNTAX_ERR = -2,
|
---|
| 515 | REDIRFD_TO_FILE = -1,
|
---|
| 516 | /* otherwise, rd_fd is redirected to rd_dup */
|
---|
| 517 |
|
---|
| 518 | HEREDOC_SKIPTABS = 1,
|
---|
| 519 | HEREDOC_QUOTED = 2,
|
---|
| 520 | } redir_type;
|
---|
| 521 |
|
---|
| 522 |
|
---|
| 523 | struct command {
|
---|
| 524 | pid_t pid; /* 0 if exited */
|
---|
| 525 | int assignment_cnt; /* how many argv[i] are assignments? */
|
---|
| 526 | smallint cmd_type; /* CMD_xxx */
|
---|
| 527 | #define CMD_NORMAL 0
|
---|
| 528 | #define CMD_SUBSHELL 1
|
---|
| 529 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
| 530 | /* used for "[[ EXPR ]]" */
|
---|
| 531 | # define CMD_SINGLEWORD_NOGLOB 2
|
---|
[1765] | 532 | #endif
|
---|
[2725] | 533 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 534 | # define CMD_FUNCDEF 3
|
---|
[1765] | 535 | #endif
|
---|
[2725] | 536 |
|
---|
| 537 | smalluint cmd_exitcode;
|
---|
| 538 | /* if non-NULL, this "command" is { list }, ( list ), or a compound statement */
|
---|
| 539 | struct pipe *group;
|
---|
| 540 | #if !BB_MMU
|
---|
| 541 | char *group_as_string;
|
---|
[1765] | 542 | #endif
|
---|
[2725] | 543 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 544 | struct function *child_func;
|
---|
| 545 | /* This field is used to prevent a bug here:
|
---|
| 546 | * while...do f1() {a;}; f1; f1() {b;}; f1; done
|
---|
| 547 | * When we execute "f1() {a;}" cmd, we create new function and clear
|
---|
| 548 | * cmd->group, cmd->group_as_string, cmd->argv[0].
|
---|
| 549 | * When we execute "f1() {b;}", we notice that f1 exists,
|
---|
| 550 | * and that its "parent cmd" struct is still "alive",
|
---|
| 551 | * we put those fields back into cmd->xxx
|
---|
| 552 | * (struct function has ->parent_cmd ptr to facilitate that).
|
---|
| 553 | * When we loop back, we can execute "f1() {a;}" again and set f1 correctly.
|
---|
| 554 | * Without this trick, loop would execute a;b;b;b;...
|
---|
| 555 | * instead of correct sequence a;b;a;b;...
|
---|
| 556 | * When command is freed, it severs the link
|
---|
| 557 | * (sets ->child_func->parent_cmd to NULL).
|
---|
| 558 | */
|
---|
[1765] | 559 | #endif
|
---|
[2725] | 560 | char **argv; /* command name and arguments */
|
---|
[1765] | 561 | /* argv vector may contain variable references (^Cvar^C, ^C0^C etc)
|
---|
| 562 | * and on execution these are substituted with their values.
|
---|
| 563 | * Substitution can make _several_ words out of one argv[n]!
|
---|
| 564 | * Example: argv[0]=='.^C*^C.' here: echo .$*.
|
---|
[2725] | 565 | * References of the form ^C`cmd arg^C are `cmd arg` substitutions.
|
---|
[1765] | 566 | */
|
---|
[2725] | 567 | struct redir_struct *redirects; /* I/O redirections */
|
---|
| 568 | };
|
---|
| 569 | /* Is there anything in this command at all? */
|
---|
| 570 | #define IS_NULL_CMD(cmd) \
|
---|
| 571 | (!(cmd)->group && !(cmd)->argv && !(cmd)->redirects)
|
---|
[821] | 572 |
|
---|
| 573 | struct pipe {
|
---|
[1765] | 574 | struct pipe *next;
|
---|
[2725] | 575 | int num_cmds; /* total number of commands in pipe */
|
---|
| 576 | int alive_cmds; /* number of commands running (not exited) */
|
---|
| 577 | int stopped_cmds; /* number of commands alive, but stopped */
|
---|
[1765] | 578 | #if ENABLE_HUSH_JOB
|
---|
| 579 | int jobid; /* job number */
|
---|
| 580 | pid_t pgrp; /* process group ID for the job */
|
---|
| 581 | char *cmdtext; /* name of job */
|
---|
| 582 | #endif
|
---|
[2725] | 583 | struct command *cmds; /* array of commands in pipe */
|
---|
[1765] | 584 | smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
|
---|
[2725] | 585 | IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */
|
---|
| 586 | IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */
|
---|
[821] | 587 | };
|
---|
[2725] | 588 | typedef enum pipe_style {
|
---|
| 589 | PIPE_SEQ = 1,
|
---|
| 590 | PIPE_AND = 2,
|
---|
| 591 | PIPE_OR = 3,
|
---|
| 592 | PIPE_BG = 4,
|
---|
| 593 | } pipe_style;
|
---|
| 594 | /* Is there anything in this pipe at all? */
|
---|
| 595 | #define IS_NULL_PIPE(pi) \
|
---|
| 596 | ((pi)->num_cmds == 0 IF_HAS_KEYWORDS( && (pi)->res_word == RES_NONE))
|
---|
[821] | 597 |
|
---|
[2725] | 598 | /* This holds pointers to the various results of parsing */
|
---|
| 599 | struct parse_context {
|
---|
| 600 | /* linked list of pipes */
|
---|
| 601 | struct pipe *list_head;
|
---|
| 602 | /* last pipe (being constructed right now) */
|
---|
| 603 | struct pipe *pipe;
|
---|
| 604 | /* last command in pipe (being constructed right now) */
|
---|
| 605 | struct command *command;
|
---|
| 606 | /* last redirect in command->redirects list */
|
---|
| 607 | struct redir_struct *pending_redirect;
|
---|
| 608 | #if !BB_MMU
|
---|
| 609 | o_string as_string;
|
---|
| 610 | #endif
|
---|
| 611 | #if HAS_KEYWORDS
|
---|
| 612 | smallint ctx_res_w;
|
---|
| 613 | smallint ctx_inverted; /* "! cmd | cmd" */
|
---|
| 614 | #if ENABLE_HUSH_CASE
|
---|
| 615 | smallint ctx_dsemicolon; /* ";;" seen */
|
---|
| 616 | #endif
|
---|
| 617 | /* bitmask of FLAG_xxx, for figuring out valid reserved words */
|
---|
| 618 | int old_flag;
|
---|
| 619 | /* group we are enclosed in:
|
---|
| 620 | * example: "if pipe1; pipe2; then pipe3; fi"
|
---|
| 621 | * when we see "if" or "then", we malloc and copy current context,
|
---|
| 622 | * and make ->stack point to it. then we parse pipeN.
|
---|
| 623 | * when closing "then" / fi" / whatever is found,
|
---|
| 624 | * we move list_head into ->stack->command->group,
|
---|
| 625 | * copy ->stack into current context, and delete ->stack.
|
---|
| 626 | * (parsing of { list } and ( list ) doesn't use this method)
|
---|
| 627 | */
|
---|
| 628 | struct parse_context *stack;
|
---|
| 629 | #endif
|
---|
[821] | 630 | };
|
---|
| 631 |
|
---|
[1765] | 632 | /* On program start, environ points to initial environment.
|
---|
| 633 | * putenv adds new pointers into it, unsetenv removes them.
|
---|
| 634 | * Neither of these (de)allocates the strings.
|
---|
| 635 | * setenv allocates new strings in malloc space and does putenv,
|
---|
| 636 | * and thus setenv is unusable (leaky) for shell's purposes */
|
---|
| 637 | #define setenv(...) setenv_is_leaky_dont_use()
|
---|
| 638 | struct variable {
|
---|
| 639 | struct variable *next;
|
---|
| 640 | char *varstr; /* points to "name=" portion */
|
---|
[2725] | 641 | #if ENABLE_HUSH_LOCAL
|
---|
| 642 | unsigned func_nest_level;
|
---|
| 643 | #endif
|
---|
[1765] | 644 | int max_len; /* if > 0, name is part of initial env; else name is malloced */
|
---|
| 645 | smallint flg_export; /* putenv should be done on this var */
|
---|
| 646 | smallint flg_read_only;
|
---|
[821] | 647 | };
|
---|
| 648 |
|
---|
[2725] | 649 | enum {
|
---|
| 650 | BC_BREAK = 1,
|
---|
| 651 | BC_CONTINUE = 2,
|
---|
| 652 | };
|
---|
[821] | 653 |
|
---|
[2725] | 654 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 655 | struct function {
|
---|
| 656 | struct function *next;
|
---|
| 657 | char *name;
|
---|
| 658 | struct command *parent_cmd;
|
---|
| 659 | struct pipe *body;
|
---|
| 660 | # if !BB_MMU
|
---|
| 661 | char *body_as_string;
|
---|
| 662 | # endif
|
---|
| 663 | };
|
---|
[1765] | 664 | #endif
|
---|
[821] | 665 |
|
---|
[2725] | 666 |
|
---|
| 667 | /* set -/+o OPT support. (TODO: make it optional)
|
---|
| 668 | * bash supports the following opts:
|
---|
| 669 | * allexport off
|
---|
| 670 | * braceexpand on
|
---|
| 671 | * emacs on
|
---|
| 672 | * errexit off
|
---|
| 673 | * errtrace off
|
---|
| 674 | * functrace off
|
---|
| 675 | * hashall on
|
---|
| 676 | * histexpand off
|
---|
| 677 | * history on
|
---|
| 678 | * ignoreeof off
|
---|
| 679 | * interactive-comments on
|
---|
| 680 | * keyword off
|
---|
| 681 | * monitor on
|
---|
| 682 | * noclobber off
|
---|
| 683 | * noexec off
|
---|
| 684 | * noglob off
|
---|
| 685 | * nolog off
|
---|
| 686 | * notify off
|
---|
| 687 | * nounset off
|
---|
| 688 | * onecmd off
|
---|
| 689 | * physical off
|
---|
| 690 | * pipefail off
|
---|
| 691 | * posix off
|
---|
| 692 | * privileged off
|
---|
| 693 | * verbose off
|
---|
| 694 | * vi off
|
---|
| 695 | * xtrace off
|
---|
| 696 | */
|
---|
[3232] | 697 | static const char o_opt_strings[] ALIGN1 =
|
---|
| 698 | "pipefail\0"
|
---|
| 699 | "noexec\0"
|
---|
| 700 | #if ENABLE_HUSH_MODE_X
|
---|
| 701 | "xtrace\0"
|
---|
| 702 | #endif
|
---|
| 703 | ;
|
---|
[1765] | 704 | enum {
|
---|
[2725] | 705 | OPT_O_PIPEFAIL,
|
---|
[3232] | 706 | OPT_O_NOEXEC,
|
---|
| 707 | #if ENABLE_HUSH_MODE_X
|
---|
| 708 | OPT_O_XTRACE,
|
---|
| 709 | #endif
|
---|
[2725] | 710 | NUM_OPT_O
|
---|
[1765] | 711 | };
|
---|
[821] | 712 |
|
---|
[1765] | 713 |
|
---|
| 714 | /* "Globals" within this file */
|
---|
| 715 | /* Sorted roughly by size (smaller offsets == smaller code) */
|
---|
| 716 | struct globals {
|
---|
[2725] | 717 | /* interactive_fd != 0 means we are an interactive shell.
|
---|
| 718 | * If we are, then saved_tty_pgrp can also be != 0, meaning
|
---|
| 719 | * that controlling tty is available. With saved_tty_pgrp == 0,
|
---|
| 720 | * job control still works, but terminal signals
|
---|
| 721 | * (^C, ^Z, ^Y, ^\) won't work at all, and background
|
---|
| 722 | * process groups can only be created with "cmd &".
|
---|
| 723 | * With saved_tty_pgrp != 0, hush will use tcsetpgrp()
|
---|
| 724 | * to give tty to the foreground process group,
|
---|
| 725 | * and will take it back when the group is stopped (^Z)
|
---|
| 726 | * or killed (^C).
|
---|
| 727 | */
|
---|
[1765] | 728 | #if ENABLE_HUSH_INTERACTIVE
|
---|
| 729 | /* 'interactive_fd' is a fd# open to ctty, if we have one
|
---|
| 730 | * _AND_ if we decided to act interactively */
|
---|
| 731 | int interactive_fd;
|
---|
| 732 | const char *PS1;
|
---|
| 733 | const char *PS2;
|
---|
[2725] | 734 | # define G_interactive_fd (G.interactive_fd)
|
---|
| 735 | #else
|
---|
| 736 | # define G_interactive_fd 0
|
---|
[1765] | 737 | #endif
|
---|
| 738 | #if ENABLE_FEATURE_EDITING
|
---|
| 739 | line_input_t *line_input_state;
|
---|
| 740 | #endif
|
---|
[2725] | 741 | pid_t root_pid;
|
---|
| 742 | pid_t root_ppid;
|
---|
| 743 | pid_t last_bg_pid;
|
---|
| 744 | #if ENABLE_HUSH_RANDOM_SUPPORT
|
---|
| 745 | random_t random_gen;
|
---|
| 746 | #endif
|
---|
[1765] | 747 | #if ENABLE_HUSH_JOB
|
---|
| 748 | int run_list_level;
|
---|
[2725] | 749 | int last_jobid;
|
---|
[1765] | 750 | pid_t saved_tty_pgrp;
|
---|
| 751 | struct pipe *job_list;
|
---|
[2725] | 752 | # define G_saved_tty_pgrp (G.saved_tty_pgrp)
|
---|
| 753 | #else
|
---|
| 754 | # define G_saved_tty_pgrp 0
|
---|
[1765] | 755 | #endif
|
---|
[2725] | 756 | char o_opt[NUM_OPT_O];
|
---|
[3232] | 757 | #if ENABLE_HUSH_MODE_X
|
---|
| 758 | # define G_x_mode (G.o_opt[OPT_O_XTRACE])
|
---|
| 759 | #else
|
---|
| 760 | # define G_x_mode 0
|
---|
| 761 | #endif
|
---|
[2725] | 762 | smallint flag_SIGINT;
|
---|
| 763 | #if ENABLE_HUSH_LOOPS
|
---|
| 764 | smallint flag_break_continue;
|
---|
| 765 | #endif
|
---|
| 766 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 767 | /* 0: outside of a function (or sourced file)
|
---|
| 768 | * -1: inside of a function, ok to use return builtin
|
---|
| 769 | * 1: return is invoked, skip all till end of func
|
---|
| 770 | */
|
---|
| 771 | smallint flag_return_in_progress;
|
---|
| 772 | #endif
|
---|
| 773 | smallint exiting; /* used to prevent EXIT trap recursion */
|
---|
| 774 | /* These four support $?, $#, and $1 */
|
---|
| 775 | smalluint last_exitcode;
|
---|
| 776 | /* are global_argv and global_argv[1..n] malloced? (note: not [0]) */
|
---|
| 777 | smalluint global_args_malloced;
|
---|
| 778 | /* how many non-NULL argv's we have. NB: $# + 1 */
|
---|
| 779 | int global_argc;
|
---|
[1765] | 780 | char **global_argv;
|
---|
[2725] | 781 | #if !BB_MMU
|
---|
| 782 | char *argv0_for_re_execing;
|
---|
| 783 | #endif
|
---|
| 784 | #if ENABLE_HUSH_LOOPS
|
---|
| 785 | unsigned depth_break_continue;
|
---|
| 786 | unsigned depth_of_loop;
|
---|
| 787 | #endif
|
---|
[1765] | 788 | const char *ifs;
|
---|
| 789 | const char *cwd;
|
---|
[2725] | 790 | struct variable *top_var;
|
---|
| 791 | char **expanded_assignments;
|
---|
| 792 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 793 | struct function *top_func;
|
---|
| 794 | # if ENABLE_HUSH_LOCAL
|
---|
| 795 | struct variable **shadowed_vars_pp;
|
---|
| 796 | unsigned func_nest_level;
|
---|
| 797 | # endif
|
---|
[1765] | 798 | #endif
|
---|
[2725] | 799 | /* Signal and trap handling */
|
---|
| 800 | #if ENABLE_HUSH_FAST
|
---|
| 801 | unsigned count_SIGCHLD;
|
---|
| 802 | unsigned handled_SIGCHLD;
|
---|
| 803 | smallint we_have_children;
|
---|
[1765] | 804 | #endif
|
---|
[3232] | 805 | /* Which signals have non-DFL handler (even with no traps set)?
|
---|
| 806 | * Set at the start to:
|
---|
| 807 | * (SIGQUIT + maybe SPECIAL_INTERACTIVE_SIGS + maybe SPECIAL_JOBSTOP_SIGS)
|
---|
| 808 | * SPECIAL_INTERACTIVE_SIGS are cleared after fork.
|
---|
| 809 | * The rest is cleared right before execv syscalls.
|
---|
| 810 | * Other than these two times, never modified.
|
---|
| 811 | */
|
---|
| 812 | unsigned special_sig_mask;
|
---|
| 813 | #if ENABLE_HUSH_JOB
|
---|
| 814 | unsigned fatal_sig_mask;
|
---|
| 815 | # define G_fatal_sig_mask G.fatal_sig_mask
|
---|
| 816 | #else
|
---|
| 817 | # define G_fatal_sig_mask 0
|
---|
| 818 | #endif
|
---|
[2725] | 819 | char **traps; /* char *traps[NSIG] */
|
---|
[3232] | 820 | sigset_t pending_set;
|
---|
[2725] | 821 | #if HUSH_DEBUG
|
---|
| 822 | unsigned long memleak_value;
|
---|
| 823 | int debug_indent;
|
---|
| 824 | #endif
|
---|
[3232] | 825 | struct sigaction sa;
|
---|
[2725] | 826 | char user_input_buf[ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 2];
|
---|
[821] | 827 | };
|
---|
[1765] | 828 | #define G (*ptr_to_globals)
|
---|
[2725] | 829 | /* Not #defining name to G.name - this quickly gets unwieldy
|
---|
| 830 | * (too many defines). Also, I actually prefer to see when a variable
|
---|
| 831 | * is global, thus "G." prefix is a useful hint */
|
---|
| 832 | #define INIT_G() do { \
|
---|
| 833 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
|
---|
[3232] | 834 | /* memset(&G.sa, 0, sizeof(G.sa)); */ \
|
---|
| 835 | sigfillset(&G.sa.sa_mask); \
|
---|
| 836 | G.sa.sa_flags = SA_RESTART; \
|
---|
[2725] | 837 | } while (0)
|
---|
[821] | 838 |
|
---|
[1765] | 839 |
|
---|
[2725] | 840 | /* Function prototypes for builtins */
|
---|
| 841 | static int builtin_cd(char **argv) FAST_FUNC;
|
---|
| 842 | static int builtin_echo(char **argv) FAST_FUNC;
|
---|
| 843 | static int builtin_eval(char **argv) FAST_FUNC;
|
---|
| 844 | static int builtin_exec(char **argv) FAST_FUNC;
|
---|
| 845 | static int builtin_exit(char **argv) FAST_FUNC;
|
---|
| 846 | static int builtin_export(char **argv) FAST_FUNC;
|
---|
[1765] | 847 | #if ENABLE_HUSH_JOB
|
---|
[2725] | 848 | static int builtin_fg_bg(char **argv) FAST_FUNC;
|
---|
| 849 | static int builtin_jobs(char **argv) FAST_FUNC;
|
---|
[1765] | 850 | #endif
|
---|
[2725] | 851 | #if ENABLE_HUSH_HELP
|
---|
| 852 | static int builtin_help(char **argv) FAST_FUNC;
|
---|
[1765] | 853 | #endif
|
---|
[3621] | 854 | #if MAX_HISTORY && ENABLE_FEATURE_EDITING
|
---|
| 855 | static int builtin_history(char **argv) FAST_FUNC;
|
---|
| 856 | #endif
|
---|
[2725] | 857 | #if ENABLE_HUSH_LOCAL
|
---|
| 858 | static int builtin_local(char **argv) FAST_FUNC;
|
---|
[1765] | 859 | #endif
|
---|
[2725] | 860 | #if HUSH_DEBUG
|
---|
| 861 | static int builtin_memleak(char **argv) FAST_FUNC;
|
---|
[1765] | 862 | #endif
|
---|
[2725] | 863 | #if ENABLE_PRINTF
|
---|
| 864 | static int builtin_printf(char **argv) FAST_FUNC;
|
---|
[1765] | 865 | #endif
|
---|
[2725] | 866 | static int builtin_pwd(char **argv) FAST_FUNC;
|
---|
| 867 | static int builtin_read(char **argv) FAST_FUNC;
|
---|
| 868 | static int builtin_set(char **argv) FAST_FUNC;
|
---|
| 869 | static int builtin_shift(char **argv) FAST_FUNC;
|
---|
| 870 | static int builtin_source(char **argv) FAST_FUNC;
|
---|
| 871 | static int builtin_test(char **argv) FAST_FUNC;
|
---|
| 872 | static int builtin_trap(char **argv) FAST_FUNC;
|
---|
| 873 | static int builtin_type(char **argv) FAST_FUNC;
|
---|
| 874 | static int builtin_true(char **argv) FAST_FUNC;
|
---|
| 875 | static int builtin_umask(char **argv) FAST_FUNC;
|
---|
| 876 | static int builtin_unset(char **argv) FAST_FUNC;
|
---|
| 877 | static int builtin_wait(char **argv) FAST_FUNC;
|
---|
| 878 | #if ENABLE_HUSH_LOOPS
|
---|
| 879 | static int builtin_break(char **argv) FAST_FUNC;
|
---|
| 880 | static int builtin_continue(char **argv) FAST_FUNC;
|
---|
[1765] | 881 | #endif
|
---|
[2725] | 882 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 883 | static int builtin_return(char **argv) FAST_FUNC;
|
---|
[1765] | 884 | #endif
|
---|
[821] | 885 |
|
---|
| 886 | /* Table of built-in functions. They can be forked or not, depending on
|
---|
| 887 | * context: within pipes, they fork. As simple commands, they do not.
|
---|
| 888 | * When used in non-forking context, they can change global variables
|
---|
[1765] | 889 | * in the parent shell process. If forked, of course they cannot.
|
---|
[821] | 890 | * For example, 'unset foo | whatever' will parse and run, but foo will
|
---|
| 891 | * still be set at the end. */
|
---|
[1765] | 892 | struct built_in_command {
|
---|
[2725] | 893 | const char *b_cmd;
|
---|
| 894 | int (*b_function)(char **argv) FAST_FUNC;
|
---|
[1765] | 895 | #if ENABLE_HUSH_HELP
|
---|
[2725] | 896 | const char *b_descr;
|
---|
| 897 | # define BLTIN(cmd, func, help) { cmd, func, help }
|
---|
[1765] | 898 | #else
|
---|
[2725] | 899 | # define BLTIN(cmd, func, help) { cmd, func }
|
---|
[1765] | 900 | #endif
|
---|
| 901 | };
|
---|
| 902 |
|
---|
[2725] | 903 | static const struct built_in_command bltins1[] = {
|
---|
| 904 | BLTIN("." , builtin_source , "Run commands in a file"),
|
---|
| 905 | BLTIN(":" , builtin_true , NULL),
|
---|
[1765] | 906 | #if ENABLE_HUSH_JOB
|
---|
[2725] | 907 | BLTIN("bg" , builtin_fg_bg , "Resume a job in the background"),
|
---|
[1765] | 908 | #endif
|
---|
[2725] | 909 | #if ENABLE_HUSH_LOOPS
|
---|
| 910 | BLTIN("break" , builtin_break , "Exit from a loop"),
|
---|
| 911 | #endif
|
---|
| 912 | BLTIN("cd" , builtin_cd , "Change directory"),
|
---|
| 913 | #if ENABLE_HUSH_LOOPS
|
---|
| 914 | BLTIN("continue" , builtin_continue, "Start new loop iteration"),
|
---|
| 915 | #endif
|
---|
| 916 | BLTIN("eval" , builtin_eval , "Construct and run shell command"),
|
---|
| 917 | BLTIN("exec" , builtin_exec , "Execute command, don't return to shell"),
|
---|
| 918 | BLTIN("exit" , builtin_exit , "Exit"),
|
---|
| 919 | BLTIN("export" , builtin_export , "Set environment variables"),
|
---|
[1765] | 920 | #if ENABLE_HUSH_JOB
|
---|
[2725] | 921 | BLTIN("fg" , builtin_fg_bg , "Bring job into the foreground"),
|
---|
[1765] | 922 | #endif
|
---|
| 923 | #if ENABLE_HUSH_HELP
|
---|
[2725] | 924 | BLTIN("help" , builtin_help , NULL),
|
---|
[1765] | 925 | #endif
|
---|
[3621] | 926 | #if MAX_HISTORY && ENABLE_FEATURE_EDITING
|
---|
| 927 | BLTIN("history" , builtin_history , "Show command history"),
|
---|
| 928 | #endif
|
---|
[2725] | 929 | #if ENABLE_HUSH_JOB
|
---|
| 930 | BLTIN("jobs" , builtin_jobs , "List jobs"),
|
---|
| 931 | #endif
|
---|
| 932 | #if ENABLE_HUSH_LOCAL
|
---|
| 933 | BLTIN("local" , builtin_local , "Set local variables"),
|
---|
| 934 | #endif
|
---|
| 935 | #if HUSH_DEBUG
|
---|
| 936 | BLTIN("memleak" , builtin_memleak , NULL),
|
---|
| 937 | #endif
|
---|
| 938 | BLTIN("read" , builtin_read , "Input into variable"),
|
---|
| 939 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 940 | BLTIN("return" , builtin_return , "Return from a function"),
|
---|
| 941 | #endif
|
---|
| 942 | BLTIN("set" , builtin_set , "Set/unset positional parameters"),
|
---|
| 943 | BLTIN("shift" , builtin_shift , "Shift positional parameters"),
|
---|
| 944 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
| 945 | BLTIN("source" , builtin_source , "Run commands in a file"),
|
---|
| 946 | #endif
|
---|
| 947 | BLTIN("trap" , builtin_trap , "Trap signals"),
|
---|
[3621] | 948 | BLTIN("true" , builtin_true , NULL),
|
---|
[2725] | 949 | BLTIN("type" , builtin_type , "Show command type"),
|
---|
| 950 | BLTIN("ulimit" , shell_builtin_ulimit , "Control resource limits"),
|
---|
| 951 | BLTIN("umask" , builtin_umask , "Set file creation mask"),
|
---|
| 952 | BLTIN("unset" , builtin_unset , "Unset variables"),
|
---|
| 953 | BLTIN("wait" , builtin_wait , "Wait for process"),
|
---|
[821] | 954 | };
|
---|
[2725] | 955 | /* For now, echo and test are unconditionally enabled.
|
---|
| 956 | * Maybe make it configurable? */
|
---|
| 957 | static const struct built_in_command bltins2[] = {
|
---|
| 958 | BLTIN("[" , builtin_test , NULL),
|
---|
| 959 | BLTIN("echo" , builtin_echo , NULL),
|
---|
| 960 | #if ENABLE_PRINTF
|
---|
| 961 | BLTIN("printf" , builtin_printf , NULL),
|
---|
| 962 | #endif
|
---|
| 963 | BLTIN("pwd" , builtin_pwd , NULL),
|
---|
| 964 | BLTIN("test" , builtin_test , NULL),
|
---|
| 965 | };
|
---|
[821] | 966 |
|
---|
[1765] | 967 |
|
---|
[2725] | 968 | /* Debug printouts.
|
---|
| 969 | */
|
---|
| 970 | #if HUSH_DEBUG
|
---|
| 971 | /* prevent disasters with G.debug_indent < 0 */
|
---|
| 972 | # define indent() fdprintf(2, "%*s", (G.debug_indent * 2) & 0xff, "")
|
---|
| 973 | # define debug_enter() (G.debug_indent++)
|
---|
| 974 | # define debug_leave() (G.debug_indent--)
|
---|
| 975 | #else
|
---|
| 976 | # define indent() ((void)0)
|
---|
| 977 | # define debug_enter() ((void)0)
|
---|
| 978 | # define debug_leave() ((void)0)
|
---|
| 979 | #endif
|
---|
| 980 |
|
---|
| 981 | #ifndef debug_printf
|
---|
| 982 | # define debug_printf(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 983 | #endif
|
---|
| 984 |
|
---|
| 985 | #ifndef debug_printf_parse
|
---|
| 986 | # define debug_printf_parse(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 987 | #endif
|
---|
| 988 |
|
---|
| 989 | #ifndef debug_printf_exec
|
---|
| 990 | #define debug_printf_exec(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 991 | #endif
|
---|
| 992 |
|
---|
| 993 | #ifndef debug_printf_env
|
---|
| 994 | # define debug_printf_env(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 995 | #endif
|
---|
| 996 |
|
---|
| 997 | #ifndef debug_printf_jobs
|
---|
| 998 | # define debug_printf_jobs(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 999 | # define DEBUG_JOBS 1
|
---|
| 1000 | #else
|
---|
| 1001 | # define DEBUG_JOBS 0
|
---|
| 1002 | #endif
|
---|
| 1003 |
|
---|
| 1004 | #ifndef debug_printf_expand
|
---|
| 1005 | # define debug_printf_expand(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 1006 | # define DEBUG_EXPAND 1
|
---|
| 1007 | #else
|
---|
| 1008 | # define DEBUG_EXPAND 0
|
---|
| 1009 | #endif
|
---|
| 1010 |
|
---|
| 1011 | #ifndef debug_printf_varexp
|
---|
| 1012 | # define debug_printf_varexp(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 1013 | #endif
|
---|
| 1014 |
|
---|
| 1015 | #ifndef debug_printf_glob
|
---|
| 1016 | # define debug_printf_glob(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 1017 | # define DEBUG_GLOB 1
|
---|
| 1018 | #else
|
---|
| 1019 | # define DEBUG_GLOB 0
|
---|
| 1020 | #endif
|
---|
| 1021 |
|
---|
| 1022 | #ifndef debug_printf_list
|
---|
| 1023 | # define debug_printf_list(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 1024 | #endif
|
---|
| 1025 |
|
---|
| 1026 | #ifndef debug_printf_subst
|
---|
| 1027 | # define debug_printf_subst(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 1028 | #endif
|
---|
| 1029 |
|
---|
| 1030 | #ifndef debug_printf_clean
|
---|
| 1031 | # define debug_printf_clean(...) (indent(), fdprintf(2, __VA_ARGS__))
|
---|
| 1032 | # define DEBUG_CLEAN 1
|
---|
| 1033 | #else
|
---|
| 1034 | # define DEBUG_CLEAN 0
|
---|
| 1035 | #endif
|
---|
| 1036 |
|
---|
| 1037 | #if DEBUG_EXPAND
|
---|
| 1038 | static void debug_print_strings(const char *prefix, char **vv)
|
---|
[1765] | 1039 | {
|
---|
[2725] | 1040 | indent();
|
---|
| 1041 | fdprintf(2, "%s:\n", prefix);
|
---|
| 1042 | while (*vv)
|
---|
| 1043 | fdprintf(2, " '%s'\n", *vv++);
|
---|
[1765] | 1044 | }
|
---|
[2725] | 1045 | #else
|
---|
| 1046 | # define debug_print_strings(prefix, vv) ((void)0)
|
---|
| 1047 | #endif
|
---|
[1765] | 1048 |
|
---|
[2725] | 1049 |
|
---|
| 1050 | /* Leak hunting. Use hush_leaktool.sh for post-processing.
|
---|
| 1051 | */
|
---|
| 1052 | #if LEAK_HUNTING
|
---|
| 1053 | static void *xxmalloc(int lineno, size_t size)
|
---|
[1765] | 1054 | {
|
---|
[2725] | 1055 | void *ptr = xmalloc((size + 0xff) & ~0xff);
|
---|
| 1056 | fdprintf(2, "line %d: malloc %p\n", lineno, ptr);
|
---|
| 1057 | return ptr;
|
---|
[1765] | 1058 | }
|
---|
[2725] | 1059 | static void *xxrealloc(int lineno, void *ptr, size_t size)
|
---|
[1765] | 1060 | {
|
---|
[2725] | 1061 | ptr = xrealloc(ptr, (size + 0xff) & ~0xff);
|
---|
| 1062 | fdprintf(2, "line %d: realloc %p\n", lineno, ptr);
|
---|
| 1063 | return ptr;
|
---|
[1765] | 1064 | }
|
---|
[2725] | 1065 | static char *xxstrdup(int lineno, const char *str)
|
---|
[1765] | 1066 | {
|
---|
[2725] | 1067 | char *ptr = xstrdup(str);
|
---|
| 1068 | fdprintf(2, "line %d: strdup %p\n", lineno, ptr);
|
---|
| 1069 | return ptr;
|
---|
[1765] | 1070 | }
|
---|
[2725] | 1071 | static void xxfree(void *ptr)
|
---|
| 1072 | {
|
---|
| 1073 | fdprintf(2, "free %p\n", ptr);
|
---|
| 1074 | free(ptr);
|
---|
| 1075 | }
|
---|
| 1076 | # define xmalloc(s) xxmalloc(__LINE__, s)
|
---|
| 1077 | # define xrealloc(p, s) xxrealloc(__LINE__, p, s)
|
---|
| 1078 | # define xstrdup(s) xxstrdup(__LINE__, s)
|
---|
| 1079 | # define free(p) xxfree(p)
|
---|
| 1080 | #endif
|
---|
[1765] | 1081 |
|
---|
[2725] | 1082 |
|
---|
| 1083 | /* Syntax and runtime errors. They always abort scripts.
|
---|
| 1084 | * In interactive use they usually discard unparsed and/or unexecuted commands
|
---|
| 1085 | * and return to the prompt.
|
---|
| 1086 | * HUSH_DEBUG >= 2 prints line number in this file where it was detected.
|
---|
| 1087 | */
|
---|
| 1088 | #if HUSH_DEBUG < 2
|
---|
| 1089 | # define die_if_script(lineno, ...) die_if_script(__VA_ARGS__)
|
---|
| 1090 | # define syntax_error(lineno, msg) syntax_error(msg)
|
---|
| 1091 | # define syntax_error_at(lineno, msg) syntax_error_at(msg)
|
---|
| 1092 | # define syntax_error_unterm_ch(lineno, ch) syntax_error_unterm_ch(ch)
|
---|
| 1093 | # define syntax_error_unterm_str(lineno, s) syntax_error_unterm_str(s)
|
---|
| 1094 | # define syntax_error_unexpected_ch(lineno, ch) syntax_error_unexpected_ch(ch)
|
---|
| 1095 | #endif
|
---|
| 1096 |
|
---|
| 1097 | static void die_if_script(unsigned lineno, const char *fmt, ...)
|
---|
[1765] | 1098 | {
|
---|
[2725] | 1099 | va_list p;
|
---|
| 1100 |
|
---|
| 1101 | #if HUSH_DEBUG >= 2
|
---|
| 1102 | bb_error_msg("hush.c:%u", lineno);
|
---|
| 1103 | #endif
|
---|
| 1104 | va_start(p, fmt);
|
---|
| 1105 | bb_verror_msg(fmt, p, NULL);
|
---|
| 1106 | va_end(p);
|
---|
| 1107 | if (!G_interactive_fd)
|
---|
| 1108 | xfunc_die();
|
---|
[1765] | 1109 | }
|
---|
| 1110 |
|
---|
[3232] | 1111 | static void syntax_error(unsigned lineno UNUSED_PARAM, const char *msg)
|
---|
[1765] | 1112 | {
|
---|
[2725] | 1113 | if (msg)
|
---|
[3232] | 1114 | bb_error_msg("syntax error: %s", msg);
|
---|
[2725] | 1115 | else
|
---|
[3232] | 1116 | bb_error_msg("syntax error");
|
---|
[1765] | 1117 | }
|
---|
| 1118 |
|
---|
[3232] | 1119 | static void syntax_error_at(unsigned lineno UNUSED_PARAM, const char *msg)
|
---|
[1765] | 1120 | {
|
---|
[3232] | 1121 | bb_error_msg("syntax error at '%s'", msg);
|
---|
[2725] | 1122 | }
|
---|
[1765] | 1123 |
|
---|
[3232] | 1124 | static void syntax_error_unterm_str(unsigned lineno UNUSED_PARAM, const char *s)
|
---|
[2725] | 1125 | {
|
---|
[3232] | 1126 | bb_error_msg("syntax error: unterminated %s", s);
|
---|
[1765] | 1127 | }
|
---|
| 1128 |
|
---|
[2725] | 1129 | static void syntax_error_unterm_ch(unsigned lineno, char ch)
|
---|
[1765] | 1130 | {
|
---|
[2725] | 1131 | char msg[2] = { ch, '\0' };
|
---|
| 1132 | syntax_error_unterm_str(lineno, msg);
|
---|
[1765] | 1133 | }
|
---|
| 1134 |
|
---|
[3232] | 1135 | static void syntax_error_unexpected_ch(unsigned lineno UNUSED_PARAM, int ch)
|
---|
[1765] | 1136 | {
|
---|
[2725] | 1137 | char msg[2];
|
---|
| 1138 | msg[0] = ch;
|
---|
| 1139 | msg[1] = '\0';
|
---|
[3232] | 1140 | bb_error_msg("syntax error: unexpected %s", ch == EOF ? "EOF" : msg);
|
---|
[1765] | 1141 | }
|
---|
| 1142 |
|
---|
[2725] | 1143 | #if HUSH_DEBUG < 2
|
---|
| 1144 | # undef die_if_script
|
---|
| 1145 | # undef syntax_error
|
---|
| 1146 | # undef syntax_error_at
|
---|
| 1147 | # undef syntax_error_unterm_ch
|
---|
| 1148 | # undef syntax_error_unterm_str
|
---|
| 1149 | # undef syntax_error_unexpected_ch
|
---|
| 1150 | #else
|
---|
| 1151 | # define die_if_script(...) die_if_script(__LINE__, __VA_ARGS__)
|
---|
| 1152 | # define syntax_error(msg) syntax_error(__LINE__, msg)
|
---|
| 1153 | # define syntax_error_at(msg) syntax_error_at(__LINE__, msg)
|
---|
| 1154 | # define syntax_error_unterm_ch(ch) syntax_error_unterm_ch(__LINE__, ch)
|
---|
| 1155 | # define syntax_error_unterm_str(s) syntax_error_unterm_str(__LINE__, s)
|
---|
| 1156 | # define syntax_error_unexpected_ch(ch) syntax_error_unexpected_ch(__LINE__, ch)
|
---|
| 1157 | #endif
|
---|
[1765] | 1158 |
|
---|
| 1159 |
|
---|
[2725] | 1160 | #if ENABLE_HUSH_INTERACTIVE
|
---|
| 1161 | static void cmdedit_update_prompt(void);
|
---|
| 1162 | #else
|
---|
| 1163 | # define cmdedit_update_prompt() ((void)0)
|
---|
| 1164 | #endif
|
---|
[1765] | 1165 |
|
---|
| 1166 |
|
---|
[2725] | 1167 | /* Utility functions
|
---|
| 1168 | */
|
---|
| 1169 | /* Replace each \x with x in place, return ptr past NUL. */
|
---|
| 1170 | static char *unbackslash(char *src)
|
---|
[821] | 1171 | {
|
---|
[2725] | 1172 | char *dst = src = strchrnul(src, '\\');
|
---|
| 1173 | while (1) {
|
---|
| 1174 | if (*src == '\\')
|
---|
| 1175 | src++;
|
---|
| 1176 | if ((*dst++ = *src++) == '\0')
|
---|
| 1177 | break;
|
---|
| 1178 | }
|
---|
| 1179 | return dst;
|
---|
[821] | 1180 | }
|
---|
| 1181 |
|
---|
[2725] | 1182 | static char **add_strings_to_strings(char **strings, char **add, int need_to_dup)
|
---|
[821] | 1183 | {
|
---|
[2725] | 1184 | int i;
|
---|
| 1185 | unsigned count1;
|
---|
| 1186 | unsigned count2;
|
---|
| 1187 | char **v;
|
---|
[821] | 1188 |
|
---|
[2725] | 1189 | v = strings;
|
---|
| 1190 | count1 = 0;
|
---|
| 1191 | if (v) {
|
---|
| 1192 | while (*v) {
|
---|
| 1193 | count1++;
|
---|
| 1194 | v++;
|
---|
| 1195 | }
|
---|
[821] | 1196 | }
|
---|
[2725] | 1197 | count2 = 0;
|
---|
| 1198 | v = add;
|
---|
| 1199 | while (*v) {
|
---|
| 1200 | count2++;
|
---|
| 1201 | v++;
|
---|
| 1202 | }
|
---|
| 1203 | v = xrealloc(strings, (count1 + count2 + 1) * sizeof(char*));
|
---|
| 1204 | v[count1 + count2] = NULL;
|
---|
| 1205 | i = count2;
|
---|
| 1206 | while (--i >= 0)
|
---|
| 1207 | v[count1 + i] = (need_to_dup ? xstrdup(add[i]) : add[i]);
|
---|
| 1208 | return v;
|
---|
[821] | 1209 | }
|
---|
[2725] | 1210 | #if LEAK_HUNTING
|
---|
| 1211 | static char **xx_add_strings_to_strings(int lineno, char **strings, char **add, int need_to_dup)
|
---|
| 1212 | {
|
---|
| 1213 | char **ptr = add_strings_to_strings(strings, add, need_to_dup);
|
---|
| 1214 | fdprintf(2, "line %d: add_strings_to_strings %p\n", lineno, ptr);
|
---|
| 1215 | return ptr;
|
---|
| 1216 | }
|
---|
| 1217 | #define add_strings_to_strings(strings, add, need_to_dup) \
|
---|
| 1218 | xx_add_strings_to_strings(__LINE__, strings, add, need_to_dup)
|
---|
| 1219 | #endif
|
---|
[821] | 1220 |
|
---|
[2725] | 1221 | /* Note: takes ownership of "add" ptr (it is not strdup'ed) */
|
---|
| 1222 | static char **add_string_to_strings(char **strings, char *add)
|
---|
[821] | 1223 | {
|
---|
[2725] | 1224 | char *v[2];
|
---|
| 1225 | v[0] = add;
|
---|
| 1226 | v[1] = NULL;
|
---|
| 1227 | return add_strings_to_strings(strings, v, /*dup:*/ 0);
|
---|
[821] | 1228 | }
|
---|
[2725] | 1229 | #if LEAK_HUNTING
|
---|
| 1230 | static char **xx_add_string_to_strings(int lineno, char **strings, char *add)
|
---|
| 1231 | {
|
---|
| 1232 | char **ptr = add_string_to_strings(strings, add);
|
---|
| 1233 | fdprintf(2, "line %d: add_string_to_strings %p\n", lineno, ptr);
|
---|
| 1234 | return ptr;
|
---|
| 1235 | }
|
---|
| 1236 | #define add_string_to_strings(strings, add) \
|
---|
| 1237 | xx_add_string_to_strings(__LINE__, strings, add)
|
---|
| 1238 | #endif
|
---|
[821] | 1239 |
|
---|
[2725] | 1240 | static void free_strings(char **strings)
|
---|
[821] | 1241 | {
|
---|
[2725] | 1242 | char **v;
|
---|
| 1243 |
|
---|
| 1244 | if (!strings)
|
---|
| 1245 | return;
|
---|
| 1246 | v = strings;
|
---|
| 1247 | while (*v) {
|
---|
| 1248 | free(*v);
|
---|
| 1249 | v++;
|
---|
| 1250 | }
|
---|
| 1251 | free(strings);
|
---|
[821] | 1252 | }
|
---|
| 1253 |
|
---|
[2725] | 1254 |
|
---|
| 1255 | /* Helpers for setting new $n and restoring them back
|
---|
| 1256 | */
|
---|
| 1257 | typedef struct save_arg_t {
|
---|
| 1258 | char *sv_argv0;
|
---|
| 1259 | char **sv_g_argv;
|
---|
| 1260 | int sv_g_argc;
|
---|
| 1261 | smallint sv_g_malloced;
|
---|
| 1262 | } save_arg_t;
|
---|
| 1263 |
|
---|
| 1264 | static void save_and_replace_G_args(save_arg_t *sv, char **argv)
|
---|
[821] | 1265 | {
|
---|
[2725] | 1266 | int n;
|
---|
[1765] | 1267 |
|
---|
[2725] | 1268 | sv->sv_argv0 = argv[0];
|
---|
| 1269 | sv->sv_g_argv = G.global_argv;
|
---|
| 1270 | sv->sv_g_argc = G.global_argc;
|
---|
| 1271 | sv->sv_g_malloced = G.global_args_malloced;
|
---|
| 1272 |
|
---|
| 1273 | argv[0] = G.global_argv[0]; /* retain $0 */
|
---|
| 1274 | G.global_argv = argv;
|
---|
| 1275 | G.global_args_malloced = 0;
|
---|
| 1276 |
|
---|
| 1277 | n = 1;
|
---|
| 1278 | while (*++argv)
|
---|
| 1279 | n++;
|
---|
| 1280 | G.global_argc = n;
|
---|
[821] | 1281 | }
|
---|
| 1282 |
|
---|
[2725] | 1283 | static void restore_G_args(save_arg_t *sv, char **argv)
|
---|
[821] | 1284 | {
|
---|
[2725] | 1285 | char **pp;
|
---|
[821] | 1286 |
|
---|
[2725] | 1287 | if (G.global_args_malloced) {
|
---|
| 1288 | /* someone ran "set -- arg1 arg2 ...", undo */
|
---|
| 1289 | pp = G.global_argv;
|
---|
| 1290 | while (*++pp) /* note: does not free $0 */
|
---|
| 1291 | free(*pp);
|
---|
| 1292 | free(G.global_argv);
|
---|
[821] | 1293 | }
|
---|
[2725] | 1294 | argv[0] = sv->sv_argv0;
|
---|
| 1295 | G.global_argv = sv->sv_g_argv;
|
---|
| 1296 | G.global_argc = sv->sv_g_argc;
|
---|
| 1297 | G.global_args_malloced = sv->sv_g_malloced;
|
---|
| 1298 | }
|
---|
[821] | 1299 |
|
---|
| 1300 |
|
---|
[2725] | 1301 | /* Basic theory of signal handling in shell
|
---|
| 1302 | * ========================================
|
---|
| 1303 | * This does not describe what hush does, rather, it is current understanding
|
---|
| 1304 | * what it _should_ do. If it doesn't, it's a bug.
|
---|
| 1305 | * http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#trap
|
---|
| 1306 | *
|
---|
| 1307 | * Signals are handled only after each pipe ("cmd | cmd | cmd" thing)
|
---|
| 1308 | * is finished or backgrounded. It is the same in interactive and
|
---|
| 1309 | * non-interactive shells, and is the same regardless of whether
|
---|
| 1310 | * a user trap handler is installed or a shell special one is in effect.
|
---|
| 1311 | * ^C or ^Z from keyboard seems to execute "at once" because it usually
|
---|
| 1312 | * backgrounds (i.e. stops) or kills all members of currently running
|
---|
| 1313 | * pipe.
|
---|
| 1314 | *
|
---|
[3621] | 1315 | * Wait builtin is interruptible by signals for which user trap is set
|
---|
[2725] | 1316 | * or by SIGINT in interactive shell.
|
---|
| 1317 | *
|
---|
| 1318 | * Trap handlers will execute even within trap handlers. (right?)
|
---|
| 1319 | *
|
---|
| 1320 | * User trap handlers are forgotten when subshell ("(cmd)") is entered,
|
---|
| 1321 | * except for handlers set to '' (empty string).
|
---|
| 1322 | *
|
---|
| 1323 | * If job control is off, backgrounded commands ("cmd &")
|
---|
| 1324 | * have SIGINT, SIGQUIT set to SIG_IGN.
|
---|
| 1325 | *
|
---|
| 1326 | * Commands which are run in command substitution ("`cmd`")
|
---|
| 1327 | * have SIGTTIN, SIGTTOU, SIGTSTP set to SIG_IGN.
|
---|
| 1328 | *
|
---|
| 1329 | * Ordinary commands have signals set to SIG_IGN/DFL as inherited
|
---|
| 1330 | * by the shell from its parent.
|
---|
| 1331 | *
|
---|
| 1332 | * Signals which differ from SIG_DFL action
|
---|
| 1333 | * (note: child (i.e., [v]forked) shell is not an interactive shell):
|
---|
| 1334 | *
|
---|
| 1335 | * SIGQUIT: ignore
|
---|
| 1336 | * SIGTERM (interactive): ignore
|
---|
| 1337 | * SIGHUP (interactive):
|
---|
| 1338 | * send SIGCONT to stopped jobs, send SIGHUP to all jobs and exit
|
---|
| 1339 | * SIGTTIN, SIGTTOU, SIGTSTP (if job control is on): ignore
|
---|
| 1340 | * Note that ^Z is handled not by trapping SIGTSTP, but by seeing
|
---|
| 1341 | * that all pipe members are stopped. Try this in bash:
|
---|
| 1342 | * while :; do :; done - ^Z does not background it
|
---|
| 1343 | * (while :; do :; done) - ^Z backgrounds it
|
---|
| 1344 | * SIGINT (interactive): wait for last pipe, ignore the rest
|
---|
| 1345 | * of the command line, show prompt. NB: ^C does not send SIGINT
|
---|
| 1346 | * to interactive shell while shell is waiting for a pipe,
|
---|
| 1347 | * since shell is bg'ed (is not in foreground process group).
|
---|
| 1348 | * Example 1: this waits 5 sec, but does not execute ls:
|
---|
| 1349 | * "echo $$; sleep 5; ls -l" + "kill -INT <pid>"
|
---|
| 1350 | * Example 2: this does not wait and does not execute ls:
|
---|
| 1351 | * "echo $$; sleep 5 & wait; ls -l" + "kill -INT <pid>"
|
---|
| 1352 | * Example 3: this does not wait 5 sec, but executes ls:
|
---|
| 1353 | * "sleep 5; ls -l" + press ^C
|
---|
[3232] | 1354 | * Example 4: this does not wait and does not execute ls:
|
---|
| 1355 | * "sleep 5 & wait; ls -l" + press ^C
|
---|
[2725] | 1356 | *
|
---|
| 1357 | * (What happens to signals which are IGN on shell start?)
|
---|
| 1358 | * (What happens with signal mask on shell start?)
|
---|
| 1359 | *
|
---|
[3232] | 1360 | * Old implementation
|
---|
| 1361 | * ==================
|
---|
[2725] | 1362 | * We use in-kernel pending signal mask to determine which signals were sent.
|
---|
| 1363 | * We block all signals which we don't want to take action immediately,
|
---|
| 1364 | * i.e. we block all signals which need to have special handling as described
|
---|
| 1365 | * above, and all signals which have traps set.
|
---|
| 1366 | * After each pipe execution, we extract any pending signals via sigtimedwait()
|
---|
| 1367 | * and act on them.
|
---|
| 1368 | *
|
---|
[3232] | 1369 | * unsigned special_sig_mask: a mask of such "special" signals
|
---|
[2725] | 1370 | * sigset_t blocked_set: current blocked signal set
|
---|
| 1371 | *
|
---|
| 1372 | * "trap - SIGxxx":
|
---|
[3232] | 1373 | * clear bit in blocked_set unless it is also in special_sig_mask
|
---|
[2725] | 1374 | * "trap 'cmd' SIGxxx":
|
---|
| 1375 | * set bit in blocked_set (even if 'cmd' is '')
|
---|
| 1376 | * after [v]fork, if we plan to be a shell:
|
---|
| 1377 | * unblock signals with special interactive handling
|
---|
| 1378 | * (child shell is not interactive),
|
---|
| 1379 | * unset all traps except '' (note: regardless of child shell's type - {}, (), etc)
|
---|
| 1380 | * after [v]fork, if we plan to exec:
|
---|
| 1381 | * POSIX says fork clears pending signal mask in child - no need to clear it.
|
---|
| 1382 | * Restore blocked signal set to one inherited by shell just prior to exec.
|
---|
| 1383 | *
|
---|
| 1384 | * Note: as a result, we do not use signal handlers much. The only uses
|
---|
| 1385 | * are to count SIGCHLDs
|
---|
| 1386 | * and to restore tty pgrp on signal-induced exit.
|
---|
| 1387 | *
|
---|
| 1388 | * Note 2 (compat):
|
---|
| 1389 | * Standard says "When a subshell is entered, traps that are not being ignored
|
---|
| 1390 | * are set to the default actions". bash interprets it so that traps which
|
---|
| 1391 | * are set to '' (ignore) are NOT reset to defaults. We do the same.
|
---|
[3232] | 1392 | *
|
---|
| 1393 | * Problem: the above approach makes it unwieldy to catch signals while
|
---|
[3621] | 1394 | * we are in read builtin, or while we read commands from stdin:
|
---|
[3232] | 1395 | * masked signals are not visible!
|
---|
| 1396 | *
|
---|
| 1397 | * New implementation
|
---|
| 1398 | * ==================
|
---|
| 1399 | * We record each signal we are interested in by installing signal handler
|
---|
| 1400 | * for them - a bit like emulating kernel pending signal mask in userspace.
|
---|
| 1401 | * We are interested in: signals which need to have special handling
|
---|
| 1402 | * as described above, and all signals which have traps set.
|
---|
[3621] | 1403 | * Signals are recorded in pending_set.
|
---|
[3232] | 1404 | * After each pipe execution, we extract any pending signals
|
---|
| 1405 | * and act on them.
|
---|
| 1406 | *
|
---|
| 1407 | * unsigned special_sig_mask: a mask of shell-special signals.
|
---|
| 1408 | * unsigned fatal_sig_mask: a mask of signals on which we restore tty pgrp.
|
---|
| 1409 | * char *traps[sig] if trap for sig is set (even if it's '').
|
---|
| 1410 | * sigset_t pending_set: set of sigs we received.
|
---|
| 1411 | *
|
---|
| 1412 | * "trap - SIGxxx":
|
---|
| 1413 | * if sig is in special_sig_mask, set handler back to:
|
---|
| 1414 | * record_pending_signo, or to IGN if it's a tty stop signal
|
---|
| 1415 | * if sig is in fatal_sig_mask, set handler back to sigexit.
|
---|
| 1416 | * else: set handler back to SIG_DFL
|
---|
| 1417 | * "trap 'cmd' SIGxxx":
|
---|
| 1418 | * set handler to record_pending_signo.
|
---|
| 1419 | * "trap '' SIGxxx":
|
---|
| 1420 | * set handler to SIG_IGN.
|
---|
| 1421 | * after [v]fork, if we plan to be a shell:
|
---|
| 1422 | * set signals with special interactive handling to SIG_DFL
|
---|
| 1423 | * (because child shell is not interactive),
|
---|
| 1424 | * unset all traps except '' (note: regardless of child shell's type - {}, (), etc)
|
---|
| 1425 | * after [v]fork, if we plan to exec:
|
---|
| 1426 | * POSIX says fork clears pending signal mask in child - no need to clear it.
|
---|
| 1427 | *
|
---|
| 1428 | * To make wait builtin interruptible, we handle SIGCHLD as special signal,
|
---|
| 1429 | * otherwise (if we leave it SIG_DFL) sigsuspend in wait builtin will not wake up on it.
|
---|
| 1430 | *
|
---|
| 1431 | * Note (compat):
|
---|
| 1432 | * Standard says "When a subshell is entered, traps that are not being ignored
|
---|
| 1433 | * are set to the default actions". bash interprets it so that traps which
|
---|
| 1434 | * are set to '' (ignore) are NOT reset to defaults. We do the same.
|
---|
[2725] | 1435 | */
|
---|
| 1436 | enum {
|
---|
| 1437 | SPECIAL_INTERACTIVE_SIGS = 0
|
---|
| 1438 | | (1 << SIGTERM)
|
---|
| 1439 | | (1 << SIGINT)
|
---|
| 1440 | | (1 << SIGHUP)
|
---|
| 1441 | ,
|
---|
[3232] | 1442 | SPECIAL_JOBSTOP_SIGS = 0
|
---|
[2725] | 1443 | #if ENABLE_HUSH_JOB
|
---|
| 1444 | | (1 << SIGTTIN)
|
---|
| 1445 | | (1 << SIGTTOU)
|
---|
| 1446 | | (1 << SIGTSTP)
|
---|
| 1447 | #endif
|
---|
[3232] | 1448 | ,
|
---|
[2725] | 1449 | };
|
---|
[1765] | 1450 |
|
---|
[3232] | 1451 | static void record_pending_signo(int sig)
|
---|
| 1452 | {
|
---|
| 1453 | sigaddset(&G.pending_set, sig);
|
---|
[2725] | 1454 | #if ENABLE_HUSH_FAST
|
---|
[3232] | 1455 | if (sig == SIGCHLD) {
|
---|
| 1456 | G.count_SIGCHLD++;
|
---|
[2725] | 1457 | //bb_error_msg("[%d] SIGCHLD_handler: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
---|
[3232] | 1458 | }
|
---|
| 1459 | #endif
|
---|
[821] | 1460 | }
|
---|
| 1461 |
|
---|
[3232] | 1462 | static sighandler_t install_sighandler(int sig, sighandler_t handler)
|
---|
| 1463 | {
|
---|
| 1464 | struct sigaction old_sa;
|
---|
| 1465 |
|
---|
| 1466 | /* We could use signal() to install handlers... almost:
|
---|
| 1467 | * except that we need to mask ALL signals while handlers run.
|
---|
| 1468 | * I saw signal nesting in strace, race window isn't small.
|
---|
| 1469 | * SA_RESTART is also needed, but in Linux, signal()
|
---|
| 1470 | * sets SA_RESTART too.
|
---|
| 1471 | */
|
---|
| 1472 | /* memset(&G.sa, 0, sizeof(G.sa)); - already done */
|
---|
| 1473 | /* sigfillset(&G.sa.sa_mask); - already done */
|
---|
| 1474 | /* G.sa.sa_flags = SA_RESTART; - already done */
|
---|
| 1475 | G.sa.sa_handler = handler;
|
---|
| 1476 | sigaction(sig, &G.sa, &old_sa);
|
---|
| 1477 | return old_sa.sa_handler;
|
---|
| 1478 | }
|
---|
| 1479 |
|
---|
[3621] | 1480 | static void hush_exit(int exitcode) NORETURN;
|
---|
| 1481 | static void fflush_and__exit(void) NORETURN;
|
---|
| 1482 | static void restore_ttypgrp_and__exit(void) NORETURN;
|
---|
| 1483 |
|
---|
| 1484 | static void restore_ttypgrp_and__exit(void)
|
---|
| 1485 | {
|
---|
| 1486 | /* xfunc has failed! die die die */
|
---|
| 1487 | /* no EXIT traps, this is an escape hatch! */
|
---|
| 1488 | G.exiting = 1;
|
---|
| 1489 | hush_exit(xfunc_error_retval);
|
---|
| 1490 | }
|
---|
| 1491 |
|
---|
| 1492 | /* Needed only on some libc:
|
---|
| 1493 | * It was observed that on exit(), fgetc'ed buffered data
|
---|
| 1494 | * gets "unwound" via lseek(fd, -NUM, SEEK_CUR).
|
---|
| 1495 | * With the net effect that even after fork(), not vfork(),
|
---|
| 1496 | * exit() in NOEXECed applet in "sh SCRIPT":
|
---|
| 1497 | * noexec_applet_here
|
---|
| 1498 | * echo END_OF_SCRIPT
|
---|
| 1499 | * lseeks fd in input FILE object from EOF to "e" in "echo END_OF_SCRIPT".
|
---|
| 1500 | * This makes "echo END_OF_SCRIPT" executed twice.
|
---|
| 1501 | * Similar problems can be seen with die_if_script() -> xfunc_die()
|
---|
| 1502 | * and in `cmd` handling.
|
---|
| 1503 | * If set as die_func(), this makes xfunc_die() exit via _exit(), not exit():
|
---|
| 1504 | */
|
---|
| 1505 | static void fflush_and__exit(void)
|
---|
| 1506 | {
|
---|
| 1507 | fflush_all();
|
---|
| 1508 | _exit(xfunc_error_retval);
|
---|
| 1509 | }
|
---|
| 1510 |
|
---|
[1765] | 1511 | #if ENABLE_HUSH_JOB
|
---|
[2725] | 1512 |
|
---|
| 1513 | /* After [v]fork, in child: do not restore tty pgrp on xfunc death */
|
---|
[3621] | 1514 | # define disable_restore_tty_pgrp_on_exit() (die_func = fflush_and__exit)
|
---|
[2725] | 1515 | /* After [v]fork, in parent: restore tty pgrp on xfunc death */
|
---|
[3621] | 1516 | # define enable_restore_tty_pgrp_on_exit() (die_func = restore_ttypgrp_and__exit)
|
---|
[2725] | 1517 |
|
---|
| 1518 | /* Restores tty foreground process group, and exits.
|
---|
| 1519 | * May be called as signal handler for fatal signal
|
---|
| 1520 | * (will resend signal to itself, producing correct exit state)
|
---|
| 1521 | * or called directly with -EXITCODE.
|
---|
[3621] | 1522 | * We also call it if xfunc is exiting.
|
---|
| 1523 | */
|
---|
[2725] | 1524 | static void sigexit(int sig) NORETURN;
|
---|
| 1525 | static void sigexit(int sig)
|
---|
[821] | 1526 | {
|
---|
[2725] | 1527 | /* Careful: we can end up here after [v]fork. Do not restore
|
---|
| 1528 | * tty pgrp then, only top-level shell process does that */
|
---|
[3232] | 1529 | if (G_saved_tty_pgrp && getpid() == G.root_pid) {
|
---|
| 1530 | /* Disable all signals: job control, SIGPIPE, etc.
|
---|
| 1531 | * Mostly paranoid measure, to prevent infinite SIGTTOU.
|
---|
| 1532 | */
|
---|
| 1533 | sigprocmask_allsigs(SIG_BLOCK);
|
---|
[2725] | 1534 | tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp);
|
---|
[3232] | 1535 | }
|
---|
[821] | 1536 |
|
---|
[2725] | 1537 | /* Not a signal, just exit */
|
---|
| 1538 | if (sig <= 0)
|
---|
| 1539 | _exit(- sig);
|
---|
[821] | 1540 |
|
---|
[2725] | 1541 | kill_myself_with_sig(sig); /* does not return */
|
---|
| 1542 | }
|
---|
| 1543 | #else
|
---|
[821] | 1544 |
|
---|
[2725] | 1545 | # define disable_restore_tty_pgrp_on_exit() ((void)0)
|
---|
| 1546 | # define enable_restore_tty_pgrp_on_exit() ((void)0)
|
---|
| 1547 |
|
---|
[1765] | 1548 | #endif
|
---|
[821] | 1549 |
|
---|
[3232] | 1550 | static sighandler_t pick_sighandler(unsigned sig)
|
---|
| 1551 | {
|
---|
| 1552 | sighandler_t handler = SIG_DFL;
|
---|
| 1553 | if (sig < sizeof(unsigned)*8) {
|
---|
| 1554 | unsigned sigmask = (1 << sig);
|
---|
| 1555 |
|
---|
| 1556 | #if ENABLE_HUSH_JOB
|
---|
| 1557 | /* is sig fatal? */
|
---|
| 1558 | if (G_fatal_sig_mask & sigmask)
|
---|
| 1559 | handler = sigexit;
|
---|
| 1560 | else
|
---|
| 1561 | #endif
|
---|
| 1562 | /* sig has special handling? */
|
---|
| 1563 | if (G.special_sig_mask & sigmask) {
|
---|
| 1564 | handler = record_pending_signo;
|
---|
| 1565 | /* TTIN/TTOU/TSTP can't be set to record_pending_signo
|
---|
| 1566 | * in order to ignore them: they will be raised
|
---|
| 1567 | * in an endless loop when we try to do some
|
---|
| 1568 | * terminal ioctls! We do have to _ignore_ these.
|
---|
| 1569 | */
|
---|
| 1570 | if (SPECIAL_JOBSTOP_SIGS & sigmask)
|
---|
| 1571 | handler = SIG_IGN;
|
---|
| 1572 | }
|
---|
| 1573 | }
|
---|
| 1574 | return handler;
|
---|
| 1575 | }
|
---|
| 1576 |
|
---|
[2725] | 1577 | /* Restores tty foreground process group, and exits. */
|
---|
| 1578 | static void hush_exit(int exitcode)
|
---|
[821] | 1579 | {
|
---|
[3232] | 1580 | #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
|
---|
| 1581 | save_history(G.line_input_state);
|
---|
| 1582 | #endif
|
---|
| 1583 |
|
---|
| 1584 | fflush_all();
|
---|
[2725] | 1585 | if (G.exiting <= 0 && G.traps && G.traps[0] && G.traps[0][0]) {
|
---|
| 1586 | char *argv[3];
|
---|
| 1587 | /* argv[0] is unused */
|
---|
| 1588 | argv[1] = G.traps[0];
|
---|
| 1589 | argv[2] = NULL;
|
---|
| 1590 | G.exiting = 1; /* prevent EXIT trap recursion */
|
---|
| 1591 | /* Note: G.traps[0] is not cleared!
|
---|
| 1592 | * "trap" will still show it, if executed
|
---|
| 1593 | * in the handler */
|
---|
| 1594 | builtin_eval(argv);
|
---|
| 1595 | }
|
---|
[821] | 1596 |
|
---|
[2725] | 1597 | #if ENABLE_FEATURE_CLEAN_UP
|
---|
| 1598 | {
|
---|
| 1599 | struct variable *cur_var;
|
---|
| 1600 | if (G.cwd != bb_msg_unknown)
|
---|
| 1601 | free((char*)G.cwd);
|
---|
| 1602 | cur_var = G.top_var;
|
---|
| 1603 | while (cur_var) {
|
---|
| 1604 | struct variable *tmp = cur_var;
|
---|
| 1605 | if (!cur_var->max_len)
|
---|
| 1606 | free(cur_var->varstr);
|
---|
| 1607 | cur_var = cur_var->next;
|
---|
| 1608 | free(tmp);
|
---|
| 1609 | }
|
---|
[821] | 1610 | }
|
---|
[1765] | 1611 | #endif
|
---|
[821] | 1612 |
|
---|
[3621] | 1613 | fflush_all();
|
---|
[1765] | 1614 | #if ENABLE_HUSH_JOB
|
---|
[2725] | 1615 | sigexit(- (exitcode & 0xff));
|
---|
| 1616 | #else
|
---|
[3621] | 1617 | _exit(exitcode);
|
---|
[2725] | 1618 | #endif
|
---|
| 1619 | }
|
---|
| 1620 |
|
---|
| 1621 |
|
---|
[3232] | 1622 | //TODO: return a mask of ALL handled sigs?
|
---|
| 1623 | static int check_and_run_traps(void)
|
---|
[821] | 1624 | {
|
---|
[2725] | 1625 | int last_sig = 0;
|
---|
[821] | 1626 |
|
---|
[2725] | 1627 | while (1) {
|
---|
[3232] | 1628 | int sig;
|
---|
| 1629 |
|
---|
| 1630 | if (sigisemptyset(&G.pending_set))
|
---|
[2725] | 1631 | break;
|
---|
[3232] | 1632 | sig = 0;
|
---|
| 1633 | do {
|
---|
| 1634 | sig++;
|
---|
| 1635 | if (sigismember(&G.pending_set, sig)) {
|
---|
| 1636 | sigdelset(&G.pending_set, sig);
|
---|
| 1637 | goto got_sig;
|
---|
| 1638 | }
|
---|
| 1639 | } while (sig < NSIG);
|
---|
| 1640 | break;
|
---|
| 1641 | got_sig:
|
---|
[2725] | 1642 | if (G.traps && G.traps[sig]) {
|
---|
| 1643 | if (G.traps[sig][0]) {
|
---|
| 1644 | /* We have user-defined handler */
|
---|
[3232] | 1645 | smalluint save_rcode;
|
---|
[2725] | 1646 | char *argv[3];
|
---|
| 1647 | /* argv[0] is unused */
|
---|
| 1648 | argv[1] = G.traps[sig];
|
---|
| 1649 | argv[2] = NULL;
|
---|
| 1650 | save_rcode = G.last_exitcode;
|
---|
| 1651 | builtin_eval(argv);
|
---|
| 1652 | G.last_exitcode = save_rcode;
|
---|
[3232] | 1653 | last_sig = sig;
|
---|
[2725] | 1654 | } /* else: "" trap, ignoring signal */
|
---|
| 1655 | continue;
|
---|
| 1656 | }
|
---|
| 1657 | /* not a trap: special action */
|
---|
| 1658 | switch (sig) {
|
---|
| 1659 | case SIGINT:
|
---|
| 1660 | /* Builtin was ^C'ed, make it look prettier: */
|
---|
| 1661 | bb_putchar('\n');
|
---|
| 1662 | G.flag_SIGINT = 1;
|
---|
[3232] | 1663 | last_sig = sig;
|
---|
[2725] | 1664 | break;
|
---|
| 1665 | #if ENABLE_HUSH_JOB
|
---|
| 1666 | case SIGHUP: {
|
---|
| 1667 | struct pipe *job;
|
---|
| 1668 | /* bash is observed to signal whole process groups,
|
---|
| 1669 | * not individual processes */
|
---|
| 1670 | for (job = G.job_list; job; job = job->next) {
|
---|
| 1671 | if (job->pgrp <= 0)
|
---|
| 1672 | continue;
|
---|
| 1673 | debug_printf_exec("HUPing pgrp %d\n", job->pgrp);
|
---|
| 1674 | if (kill(- job->pgrp, SIGHUP) == 0)
|
---|
| 1675 | kill(- job->pgrp, SIGCONT);
|
---|
| 1676 | }
|
---|
| 1677 | sigexit(SIGHUP);
|
---|
| 1678 | }
|
---|
| 1679 | #endif
|
---|
[3232] | 1680 | #if ENABLE_HUSH_FAST
|
---|
| 1681 | case SIGCHLD:
|
---|
| 1682 | G.count_SIGCHLD++;
|
---|
| 1683 | //bb_error_msg("[%d] check_and_run_traps: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
---|
| 1684 | /* Note:
|
---|
| 1685 | * We dont do 'last_sig = sig' here -> NOT returning this sig.
|
---|
| 1686 | * This simplifies wait builtin a bit.
|
---|
| 1687 | */
|
---|
| 1688 | break;
|
---|
| 1689 | #endif
|
---|
[2725] | 1690 | default: /* ignored: */
|
---|
| 1691 | /* SIGTERM, SIGQUIT, SIGTTIN, SIGTTOU, SIGTSTP */
|
---|
[3232] | 1692 | /* Note:
|
---|
| 1693 | * We dont do 'last_sig = sig' here -> NOT returning this sig.
|
---|
| 1694 | * Example: wait is not interrupted by TERM
|
---|
| 1695 | * in interactive shell, because TERM is ignored.
|
---|
| 1696 | */
|
---|
[2725] | 1697 | break;
|
---|
| 1698 | }
|
---|
[821] | 1699 | }
|
---|
[2725] | 1700 | return last_sig;
|
---|
[821] | 1701 | }
|
---|
| 1702 |
|
---|
[2725] | 1703 |
|
---|
| 1704 | static const char *get_cwd(int force)
|
---|
[821] | 1705 | {
|
---|
[2725] | 1706 | if (force || G.cwd == NULL) {
|
---|
| 1707 | /* xrealloc_getcwd_or_warn(arg) calls free(arg),
|
---|
| 1708 | * we must not try to free(bb_msg_unknown) */
|
---|
| 1709 | if (G.cwd == bb_msg_unknown)
|
---|
| 1710 | G.cwd = NULL;
|
---|
| 1711 | G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd);
|
---|
| 1712 | if (!G.cwd)
|
---|
| 1713 | G.cwd = bb_msg_unknown;
|
---|
| 1714 | }
|
---|
| 1715 | return G.cwd;
|
---|
[821] | 1716 | }
|
---|
| 1717 |
|
---|
[2725] | 1718 |
|
---|
| 1719 | /*
|
---|
| 1720 | * Shell and environment variable support
|
---|
| 1721 | */
|
---|
| 1722 | static struct variable **get_ptr_to_local_var(const char *name, unsigned len)
|
---|
[821] | 1723 | {
|
---|
[2725] | 1724 | struct variable **pp;
|
---|
| 1725 | struct variable *cur;
|
---|
[821] | 1726 |
|
---|
[2725] | 1727 | pp = &G.top_var;
|
---|
| 1728 | while ((cur = *pp) != NULL) {
|
---|
| 1729 | if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
|
---|
| 1730 | return pp;
|
---|
| 1731 | pp = &cur->next;
|
---|
| 1732 | }
|
---|
| 1733 | return NULL;
|
---|
[821] | 1734 | }
|
---|
| 1735 |
|
---|
[2725] | 1736 | static const char* FAST_FUNC get_local_var_value(const char *name)
|
---|
[821] | 1737 | {
|
---|
[2725] | 1738 | struct variable **vpp;
|
---|
| 1739 | unsigned len = strlen(name);
|
---|
[821] | 1740 |
|
---|
[2725] | 1741 | if (G.expanded_assignments) {
|
---|
| 1742 | char **cpp = G.expanded_assignments;
|
---|
| 1743 | while (*cpp) {
|
---|
| 1744 | char *cp = *cpp;
|
---|
| 1745 | if (strncmp(cp, name, len) == 0 && cp[len] == '=')
|
---|
| 1746 | return cp + len + 1;
|
---|
| 1747 | cpp++;
|
---|
| 1748 | }
|
---|
| 1749 | }
|
---|
[821] | 1750 |
|
---|
[2725] | 1751 | vpp = get_ptr_to_local_var(name, len);
|
---|
| 1752 | if (vpp)
|
---|
| 1753 | return (*vpp)->varstr + len + 1;
|
---|
| 1754 |
|
---|
| 1755 | if (strcmp(name, "PPID") == 0)
|
---|
| 1756 | return utoa(G.root_ppid);
|
---|
| 1757 | // bash compat: UID? EUID?
|
---|
| 1758 | #if ENABLE_HUSH_RANDOM_SUPPORT
|
---|
| 1759 | if (strcmp(name, "RANDOM") == 0)
|
---|
| 1760 | return utoa(next_random(&G.random_gen));
|
---|
| 1761 | #endif
|
---|
| 1762 | return NULL;
|
---|
[821] | 1763 | }
|
---|
| 1764 |
|
---|
[2725] | 1765 | /* str holds "NAME=VAL" and is expected to be malloced.
|
---|
| 1766 | * We take ownership of it.
|
---|
| 1767 | * flg_export:
|
---|
| 1768 | * 0: do not change export flag
|
---|
| 1769 | * (if creating new variable, flag will be 0)
|
---|
| 1770 | * 1: set export flag and putenv the variable
|
---|
| 1771 | * -1: clear export flag and unsetenv the variable
|
---|
| 1772 | * flg_read_only is set only when we handle -R var=val
|
---|
| 1773 | */
|
---|
| 1774 | #if !BB_MMU && ENABLE_HUSH_LOCAL
|
---|
| 1775 | /* all params are used */
|
---|
| 1776 | #elif BB_MMU && ENABLE_HUSH_LOCAL
|
---|
| 1777 | #define set_local_var(str, flg_export, local_lvl, flg_read_only) \
|
---|
| 1778 | set_local_var(str, flg_export, local_lvl)
|
---|
| 1779 | #elif BB_MMU && !ENABLE_HUSH_LOCAL
|
---|
| 1780 | #define set_local_var(str, flg_export, local_lvl, flg_read_only) \
|
---|
| 1781 | set_local_var(str, flg_export)
|
---|
| 1782 | #elif !BB_MMU && !ENABLE_HUSH_LOCAL
|
---|
| 1783 | #define set_local_var(str, flg_export, local_lvl, flg_read_only) \
|
---|
| 1784 | set_local_var(str, flg_export, flg_read_only)
|
---|
| 1785 | #endif
|
---|
| 1786 | static int set_local_var(char *str, int flg_export, int local_lvl, int flg_read_only)
|
---|
| 1787 | {
|
---|
| 1788 | struct variable **var_pp;
|
---|
| 1789 | struct variable *cur;
|
---|
[3621] | 1790 | char *free_me = NULL;
|
---|
[2725] | 1791 | char *eq_sign;
|
---|
| 1792 | int name_len;
|
---|
[821] | 1793 |
|
---|
[2725] | 1794 | eq_sign = strchr(str, '=');
|
---|
| 1795 | if (!eq_sign) { /* not expected to ever happen? */
|
---|
| 1796 | free(str);
|
---|
| 1797 | return -1;
|
---|
[821] | 1798 | }
|
---|
[2725] | 1799 |
|
---|
| 1800 | name_len = eq_sign - str + 1; /* including '=' */
|
---|
| 1801 | var_pp = &G.top_var;
|
---|
| 1802 | while ((cur = *var_pp) != NULL) {
|
---|
| 1803 | if (strncmp(cur->varstr, str, name_len) != 0) {
|
---|
| 1804 | var_pp = &cur->next;
|
---|
| 1805 | continue;
|
---|
| 1806 | }
|
---|
[3621] | 1807 |
|
---|
[2725] | 1808 | /* We found an existing var with this name */
|
---|
| 1809 | if (cur->flg_read_only) {
|
---|
| 1810 | #if !BB_MMU
|
---|
| 1811 | if (!flg_read_only)
|
---|
| 1812 | #endif
|
---|
| 1813 | bb_error_msg("%s: readonly variable", str);
|
---|
| 1814 | free(str);
|
---|
| 1815 | return -1;
|
---|
| 1816 | }
|
---|
| 1817 | if (flg_export == -1) { // "&& cur->flg_export" ?
|
---|
| 1818 | debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
|
---|
| 1819 | *eq_sign = '\0';
|
---|
| 1820 | unsetenv(str);
|
---|
| 1821 | *eq_sign = '=';
|
---|
| 1822 | }
|
---|
| 1823 | #if ENABLE_HUSH_LOCAL
|
---|
| 1824 | if (cur->func_nest_level < local_lvl) {
|
---|
| 1825 | /* New variable is declared as local,
|
---|
| 1826 | * and existing one is global, or local
|
---|
| 1827 | * from enclosing function.
|
---|
| 1828 | * Remove and save old one: */
|
---|
| 1829 | *var_pp = cur->next;
|
---|
| 1830 | cur->next = *G.shadowed_vars_pp;
|
---|
| 1831 | *G.shadowed_vars_pp = cur;
|
---|
| 1832 | /* bash 3.2.33(1) and exported vars:
|
---|
| 1833 | * # export z=z
|
---|
| 1834 | * # f() { local z=a; env | grep ^z; }
|
---|
| 1835 | * # f
|
---|
| 1836 | * z=a
|
---|
| 1837 | * # env | grep ^z
|
---|
| 1838 | * z=z
|
---|
| 1839 | */
|
---|
| 1840 | if (cur->flg_export)
|
---|
| 1841 | flg_export = 1;
|
---|
| 1842 | break;
|
---|
| 1843 | }
|
---|
| 1844 | #endif
|
---|
| 1845 | if (strcmp(cur->varstr + name_len, eq_sign + 1) == 0) {
|
---|
| 1846 | free_and_exp:
|
---|
| 1847 | free(str);
|
---|
| 1848 | goto exp;
|
---|
| 1849 | }
|
---|
| 1850 | if (cur->max_len != 0) {
|
---|
| 1851 | if (cur->max_len >= strlen(str)) {
|
---|
| 1852 | /* This one is from startup env, reuse space */
|
---|
| 1853 | strcpy(cur->varstr, str);
|
---|
| 1854 | goto free_and_exp;
|
---|
| 1855 | }
|
---|
[3621] | 1856 | /* Can't reuse */
|
---|
| 1857 | cur->max_len = 0;
|
---|
| 1858 | goto set_str_and_exp;
|
---|
[2725] | 1859 | }
|
---|
[3621] | 1860 | /* max_len == 0 signifies "malloced" var, which we can
|
---|
| 1861 | * (and have to) free. But we can't free(cur->varstr) here:
|
---|
| 1862 | * if cur->flg_export is 1, it is in the environment.
|
---|
| 1863 | * We should either unsetenv+free, or wait until putenv,
|
---|
| 1864 | * then putenv(new)+free(old).
|
---|
| 1865 | */
|
---|
| 1866 | free_me = cur->varstr;
|
---|
[2725] | 1867 | goto set_str_and_exp;
|
---|
[821] | 1868 | }
|
---|
| 1869 |
|
---|
[2725] | 1870 | /* Not found - create new variable struct */
|
---|
| 1871 | cur = xzalloc(sizeof(*cur));
|
---|
| 1872 | #if ENABLE_HUSH_LOCAL
|
---|
| 1873 | cur->func_nest_level = local_lvl;
|
---|
| 1874 | #endif
|
---|
| 1875 | cur->next = *var_pp;
|
---|
| 1876 | *var_pp = cur;
|
---|
[821] | 1877 |
|
---|
[2725] | 1878 | set_str_and_exp:
|
---|
| 1879 | cur->varstr = str;
|
---|
| 1880 | #if !BB_MMU
|
---|
| 1881 | cur->flg_read_only = flg_read_only;
|
---|
| 1882 | #endif
|
---|
| 1883 | exp:
|
---|
| 1884 | if (flg_export == 1)
|
---|
| 1885 | cur->flg_export = 1;
|
---|
| 1886 | if (name_len == 4 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S')
|
---|
| 1887 | cmdedit_update_prompt();
|
---|
| 1888 | if (cur->flg_export) {
|
---|
| 1889 | if (flg_export == -1) {
|
---|
| 1890 | cur->flg_export = 0;
|
---|
| 1891 | /* unsetenv was already done */
|
---|
| 1892 | } else {
|
---|
[3621] | 1893 | int i;
|
---|
[2725] | 1894 | debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr);
|
---|
[3621] | 1895 | i = putenv(cur->varstr);
|
---|
| 1896 | /* only now we can free old exported malloced string */
|
---|
| 1897 | free(free_me);
|
---|
| 1898 | return i;
|
---|
[2725] | 1899 | }
|
---|
[821] | 1900 | }
|
---|
[3621] | 1901 | free(free_me);
|
---|
[2725] | 1902 | return 0;
|
---|
| 1903 | }
|
---|
[821] | 1904 |
|
---|
[2725] | 1905 | /* Used at startup and after each cd */
|
---|
| 1906 | static void set_pwd_var(int exp)
|
---|
| 1907 | {
|
---|
| 1908 | set_local_var(xasprintf("PWD=%s", get_cwd(/*force:*/ 1)),
|
---|
| 1909 | /*exp:*/ exp, /*lvl:*/ 0, /*ro:*/ 0);
|
---|
[821] | 1910 | }
|
---|
| 1911 |
|
---|
[2725] | 1912 | static int unset_local_var_len(const char *name, int name_len)
|
---|
[821] | 1913 | {
|
---|
[2725] | 1914 | struct variable *cur;
|
---|
| 1915 | struct variable **var_pp;
|
---|
| 1916 |
|
---|
| 1917 | if (!name)
|
---|
| 1918 | return EXIT_SUCCESS;
|
---|
| 1919 | var_pp = &G.top_var;
|
---|
| 1920 | while ((cur = *var_pp) != NULL) {
|
---|
| 1921 | if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
|
---|
| 1922 | if (cur->flg_read_only) {
|
---|
| 1923 | bb_error_msg("%s: readonly variable", name);
|
---|
| 1924 | return EXIT_FAILURE;
|
---|
| 1925 | }
|
---|
| 1926 | *var_pp = cur->next;
|
---|
| 1927 | debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
|
---|
| 1928 | bb_unsetenv(cur->varstr);
|
---|
| 1929 | if (name_len == 3 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S')
|
---|
| 1930 | cmdedit_update_prompt();
|
---|
| 1931 | if (!cur->max_len)
|
---|
| 1932 | free(cur->varstr);
|
---|
| 1933 | free(cur);
|
---|
| 1934 | return EXIT_SUCCESS;
|
---|
[821] | 1935 | }
|
---|
[2725] | 1936 | var_pp = &cur->next;
|
---|
[821] | 1937 | }
|
---|
| 1938 | return EXIT_SUCCESS;
|
---|
| 1939 | }
|
---|
| 1940 |
|
---|
[2725] | 1941 | static int unset_local_var(const char *name)
|
---|
[821] | 1942 | {
|
---|
[2725] | 1943 | return unset_local_var_len(name, strlen(name));
|
---|
[821] | 1944 | }
|
---|
| 1945 |
|
---|
[2725] | 1946 | static void unset_vars(char **strings)
|
---|
| 1947 | {
|
---|
| 1948 | char **v;
|
---|
[821] | 1949 |
|
---|
[2725] | 1950 | if (!strings)
|
---|
| 1951 | return;
|
---|
| 1952 | v = strings;
|
---|
| 1953 | while (*v) {
|
---|
| 1954 | const char *eq = strchrnul(*v, '=');
|
---|
| 1955 | unset_local_var_len(*v, (int)(eq - *v));
|
---|
| 1956 | v++;
|
---|
[821] | 1957 | }
|
---|
[2725] | 1958 | free(strings);
|
---|
[821] | 1959 | }
|
---|
| 1960 |
|
---|
[2725] | 1961 | static void FAST_FUNC set_local_var_from_halves(const char *name, const char *val)
|
---|
[821] | 1962 | {
|
---|
[2725] | 1963 | char *var = xasprintf("%s=%s", name, val);
|
---|
| 1964 | set_local_var(var, /*flags:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
---|
[821] | 1965 | }
|
---|
| 1966 |
|
---|
[2725] | 1967 |
|
---|
| 1968 | /*
|
---|
| 1969 | * Helpers for "var1=val1 var2=val2 cmd" feature
|
---|
| 1970 | */
|
---|
| 1971 | static void add_vars(struct variable *var)
|
---|
[821] | 1972 | {
|
---|
[2725] | 1973 | struct variable *next;
|
---|
| 1974 |
|
---|
| 1975 | while (var) {
|
---|
| 1976 | next = var->next;
|
---|
| 1977 | var->next = G.top_var;
|
---|
| 1978 | G.top_var = var;
|
---|
| 1979 | if (var->flg_export) {
|
---|
| 1980 | debug_printf_env("%s: restoring exported '%s'\n", __func__, var->varstr);
|
---|
| 1981 | putenv(var->varstr);
|
---|
| 1982 | } else {
|
---|
| 1983 | debug_printf_env("%s: restoring variable '%s'\n", __func__, var->varstr);
|
---|
| 1984 | }
|
---|
| 1985 | var = next;
|
---|
| 1986 | }
|
---|
[821] | 1987 | }
|
---|
| 1988 |
|
---|
[2725] | 1989 | static struct variable *set_vars_and_save_old(char **strings)
|
---|
[821] | 1990 | {
|
---|
[2725] | 1991 | char **s;
|
---|
| 1992 | struct variable *old = NULL;
|
---|
| 1993 |
|
---|
| 1994 | if (!strings)
|
---|
| 1995 | return old;
|
---|
| 1996 | s = strings;
|
---|
| 1997 | while (*s) {
|
---|
| 1998 | struct variable *var_p;
|
---|
| 1999 | struct variable **var_pp;
|
---|
| 2000 | char *eq;
|
---|
| 2001 |
|
---|
| 2002 | eq = strchr(*s, '=');
|
---|
| 2003 | if (eq) {
|
---|
| 2004 | var_pp = get_ptr_to_local_var(*s, eq - *s);
|
---|
| 2005 | if (var_pp) {
|
---|
| 2006 | /* Remove variable from global linked list */
|
---|
| 2007 | var_p = *var_pp;
|
---|
| 2008 | debug_printf_env("%s: removing '%s'\n", __func__, var_p->varstr);
|
---|
| 2009 | *var_pp = var_p->next;
|
---|
| 2010 | /* Add it to returned list */
|
---|
| 2011 | var_p->next = old;
|
---|
| 2012 | old = var_p;
|
---|
| 2013 | }
|
---|
| 2014 | set_local_var(*s, /*exp:*/ 1, /*lvl:*/ 0, /*ro:*/ 0);
|
---|
| 2015 | }
|
---|
| 2016 | s++;
|
---|
| 2017 | }
|
---|
| 2018 | return old;
|
---|
[821] | 2019 | }
|
---|
| 2020 |
|
---|
[2725] | 2021 |
|
---|
| 2022 | /*
|
---|
[3621] | 2023 | * Unicode helper
|
---|
| 2024 | */
|
---|
| 2025 | static void reinit_unicode_for_hush(void)
|
---|
| 2026 | {
|
---|
| 2027 | /* Unicode support should be activated even if LANG is set
|
---|
| 2028 | * _during_ shell execution, not only if it was set when
|
---|
| 2029 | * shell was started. Therefore, re-check LANG every time:
|
---|
| 2030 | */
|
---|
| 2031 | if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV
|
---|
| 2032 | || ENABLE_UNICODE_USING_LOCALE
|
---|
| 2033 | ) {
|
---|
| 2034 | const char *s = get_local_var_value("LC_ALL");
|
---|
| 2035 | if (!s) s = get_local_var_value("LC_CTYPE");
|
---|
| 2036 | if (!s) s = get_local_var_value("LANG");
|
---|
| 2037 | reinit_unicode(s);
|
---|
| 2038 | }
|
---|
| 2039 | }
|
---|
| 2040 |
|
---|
| 2041 |
|
---|
| 2042 | /*
|
---|
[2725] | 2043 | * in_str support
|
---|
[821] | 2044 | */
|
---|
[2725] | 2045 | static int FAST_FUNC static_get(struct in_str *i)
|
---|
[821] | 2046 | {
|
---|
[2725] | 2047 | int ch = *i->p;
|
---|
| 2048 | if (ch != '\0') {
|
---|
| 2049 | i->p++;
|
---|
[3232] | 2050 | i->last_char = ch;
|
---|
[2725] | 2051 | return ch;
|
---|
[821] | 2052 | }
|
---|
[2725] | 2053 | return EOF;
|
---|
[821] | 2054 | }
|
---|
| 2055 |
|
---|
[2725] | 2056 | static int FAST_FUNC static_peek(struct in_str *i)
|
---|
[821] | 2057 | {
|
---|
| 2058 | return *i->p;
|
---|
| 2059 | }
|
---|
| 2060 |
|
---|
[1765] | 2061 | #if ENABLE_HUSH_INTERACTIVE
|
---|
[2725] | 2062 |
|
---|
| 2063 | static void cmdedit_update_prompt(void)
|
---|
[821] | 2064 | {
|
---|
[2725] | 2065 | if (ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
|
---|
| 2066 | G.PS1 = get_local_var_value("PS1");
|
---|
| 2067 | if (G.PS1 == NULL)
|
---|
| 2068 | G.PS1 = "\\w \\$ ";
|
---|
| 2069 | G.PS2 = get_local_var_value("PS2");
|
---|
| 2070 | } else {
|
---|
| 2071 | G.PS1 = NULL;
|
---|
| 2072 | }
|
---|
| 2073 | if (G.PS2 == NULL)
|
---|
| 2074 | G.PS2 = "> ";
|
---|
[821] | 2075 | }
|
---|
| 2076 |
|
---|
[2725] | 2077 | static const char *setup_prompt_string(int promptmode)
|
---|
[821] | 2078 | {
|
---|
[1765] | 2079 | const char *prompt_str;
|
---|
| 2080 | debug_printf("setup_prompt_string %d ", promptmode);
|
---|
[2725] | 2081 | if (!ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
|
---|
| 2082 | /* Set up the prompt */
|
---|
| 2083 | if (promptmode == 0) { /* PS1 */
|
---|
| 2084 | free((char*)G.PS1);
|
---|
| 2085 | /* bash uses $PWD value, even if it is set by user.
|
---|
| 2086 | * It uses current dir only if PWD is unset.
|
---|
| 2087 | * We always use current dir. */
|
---|
| 2088 | G.PS1 = xasprintf("%s %c ", get_cwd(0), (geteuid() != 0) ? '$' : '#');
|
---|
| 2089 | prompt_str = G.PS1;
|
---|
| 2090 | } else
|
---|
| 2091 | prompt_str = G.PS2;
|
---|
| 2092 | } else
|
---|
| 2093 | prompt_str = (promptmode == 0) ? G.PS1 : G.PS2;
|
---|
[1765] | 2094 | debug_printf("result '%s'\n", prompt_str);
|
---|
| 2095 | return prompt_str;
|
---|
[821] | 2096 | }
|
---|
| 2097 |
|
---|
| 2098 | static void get_user_input(struct in_str *i)
|
---|
| 2099 | {
|
---|
[1765] | 2100 | int r;
|
---|
| 2101 | const char *prompt_str;
|
---|
[821] | 2102 |
|
---|
[1765] | 2103 | prompt_str = setup_prompt_string(i->promptmode);
|
---|
[2725] | 2104 | # if ENABLE_FEATURE_EDITING
|
---|
[1765] | 2105 | /* Enable command line editing only while a command line
|
---|
[2725] | 2106 | * is actually being read */
|
---|
| 2107 | do {
|
---|
[3621] | 2108 | reinit_unicode_for_hush();
|
---|
[2725] | 2109 | G.flag_SIGINT = 0;
|
---|
| 2110 | /* buglet: SIGINT will not make new prompt to appear _at once_,
|
---|
| 2111 | * only after <Enter>. (^C will work) */
|
---|
[3232] | 2112 | r = read_line_input(G.line_input_state, prompt_str, G.user_input_buf, CONFIG_FEATURE_EDITING_MAX_LEN-1, /*timeout*/ -1);
|
---|
[2725] | 2113 | /* catch *SIGINT* etc (^C is handled by read_line_input) */
|
---|
[3232] | 2114 | check_and_run_traps();
|
---|
[2725] | 2115 | } while (r == 0 || G.flag_SIGINT); /* repeat if ^C or SIGINT */
|
---|
[1765] | 2116 | i->eof_flag = (r < 0);
|
---|
| 2117 | if (i->eof_flag) { /* EOF/error detected */
|
---|
[2725] | 2118 | G.user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
|
---|
| 2119 | G.user_input_buf[1] = '\0';
|
---|
[1765] | 2120 | }
|
---|
[2725] | 2121 | # else
|
---|
| 2122 | do {
|
---|
| 2123 | G.flag_SIGINT = 0;
|
---|
[3232] | 2124 | if (i->last_char == '\0' || i->last_char == '\n') {
|
---|
| 2125 | /* Why check_and_run_traps here? Try this interactively:
|
---|
| 2126 | * $ trap 'echo INT' INT; (sleep 2; kill -INT $$) &
|
---|
| 2127 | * $ <[enter], repeatedly...>
|
---|
| 2128 | * Without check_and_run_traps, handler never runs.
|
---|
| 2129 | */
|
---|
| 2130 | check_and_run_traps();
|
---|
| 2131 | fputs(prompt_str, stdout);
|
---|
| 2132 | }
|
---|
[2725] | 2133 | fflush_all();
|
---|
| 2134 | G.user_input_buf[0] = r = fgetc(i->file);
|
---|
| 2135 | /*G.user_input_buf[1] = '\0'; - already is and never changed */
|
---|
| 2136 | } while (G.flag_SIGINT);
|
---|
[1765] | 2137 | i->eof_flag = (r == EOF);
|
---|
[2725] | 2138 | # endif
|
---|
| 2139 | i->p = G.user_input_buf;
|
---|
[821] | 2140 | }
|
---|
[2725] | 2141 |
|
---|
[1765] | 2142 | #endif /* INTERACTIVE */
|
---|
[821] | 2143 |
|
---|
| 2144 | /* This is the magic location that prints prompts
|
---|
| 2145 | * and gets data back from the user */
|
---|
[2725] | 2146 | static int FAST_FUNC file_get(struct in_str *i)
|
---|
[821] | 2147 | {
|
---|
| 2148 | int ch;
|
---|
| 2149 |
|
---|
| 2150 | /* If there is data waiting, eat it up */
|
---|
| 2151 | if (i->p && *i->p) {
|
---|
[1765] | 2152 | #if ENABLE_HUSH_INTERACTIVE
|
---|
| 2153 | take_cached:
|
---|
| 2154 | #endif
|
---|
| 2155 | ch = *i->p++;
|
---|
| 2156 | if (i->eof_flag && !*i->p)
|
---|
| 2157 | ch = EOF;
|
---|
[2725] | 2158 | /* note: ch is never NUL */
|
---|
[821] | 2159 | } else {
|
---|
| 2160 | /* need to double check i->file because we might be doing something
|
---|
| 2161 | * more complicated by now, like sourcing or substituting. */
|
---|
[1765] | 2162 | #if ENABLE_HUSH_INTERACTIVE
|
---|
[3232] | 2163 | if (G_interactive_fd && i->file == stdin) {
|
---|
[1765] | 2164 | do {
|
---|
[821] | 2165 | get_user_input(i);
|
---|
[1765] | 2166 | } while (!*i->p); /* need non-empty line */
|
---|
| 2167 | i->promptmode = 1; /* PS2 */
|
---|
| 2168 | goto take_cached;
|
---|
[821] | 2169 | }
|
---|
[1765] | 2170 | #endif
|
---|
[2725] | 2171 | do ch = fgetc(i->file); while (ch == '\0');
|
---|
[821] | 2172 | }
|
---|
[2725] | 2173 | debug_printf("file_get: got '%c' %d\n", ch, ch);
|
---|
[3232] | 2174 | i->last_char = ch;
|
---|
[821] | 2175 | return ch;
|
---|
| 2176 | }
|
---|
| 2177 |
|
---|
[2725] | 2178 | /* All callers guarantee this routine will never
|
---|
| 2179 | * be used right after a newline, so prompting is not needed.
|
---|
[821] | 2180 | */
|
---|
[2725] | 2181 | static int FAST_FUNC file_peek(struct in_str *i)
|
---|
[821] | 2182 | {
|
---|
[1765] | 2183 | int ch;
|
---|
[821] | 2184 | if (i->p && *i->p) {
|
---|
[1765] | 2185 | if (i->eof_flag && !i->p[1])
|
---|
| 2186 | return EOF;
|
---|
[821] | 2187 | return *i->p;
|
---|
[2725] | 2188 | /* note: ch is never NUL */
|
---|
[821] | 2189 | }
|
---|
[2725] | 2190 | do ch = fgetc(i->file); while (ch == '\0');
|
---|
[1765] | 2191 | i->eof_flag = (ch == EOF);
|
---|
| 2192 | i->peek_buf[0] = ch;
|
---|
| 2193 | i->peek_buf[1] = '\0';
|
---|
| 2194 | i->p = i->peek_buf;
|
---|
[2725] | 2195 | debug_printf("file_peek: got '%c' %d\n", ch, ch);
|
---|
[1765] | 2196 | return ch;
|
---|
[821] | 2197 | }
|
---|
| 2198 |
|
---|
| 2199 | static void setup_file_in_str(struct in_str *i, FILE *f)
|
---|
| 2200 | {
|
---|
[3232] | 2201 | memset(i, 0, sizeof(*i));
|
---|
[821] | 2202 | i->peek = file_peek;
|
---|
| 2203 | i->get = file_get;
|
---|
[3232] | 2204 | /* i->promptmode = 0; - PS1 (memset did it) */
|
---|
[821] | 2205 | i->file = f;
|
---|
[3232] | 2206 | /* i->p = NULL; */
|
---|
[821] | 2207 | }
|
---|
| 2208 |
|
---|
| 2209 | static void setup_string_in_str(struct in_str *i, const char *s)
|
---|
| 2210 | {
|
---|
[3232] | 2211 | memset(i, 0, sizeof(*i));
|
---|
[821] | 2212 | i->peek = static_peek;
|
---|
| 2213 | i->get = static_get;
|
---|
[3232] | 2214 | /* i->promptmode = 0; - PS1 (memset did it) */
|
---|
[821] | 2215 | i->p = s;
|
---|
[3232] | 2216 | /* i->eof_flag = 0; */
|
---|
[821] | 2217 | }
|
---|
| 2218 |
|
---|
[2725] | 2219 |
|
---|
| 2220 | /*
|
---|
| 2221 | * o_string support
|
---|
| 2222 | */
|
---|
| 2223 | #define B_CHUNK (32 * sizeof(char*))
|
---|
| 2224 |
|
---|
| 2225 | static void o_reset_to_empty_unquoted(o_string *o)
|
---|
[821] | 2226 | {
|
---|
[2725] | 2227 | o->length = 0;
|
---|
| 2228 | o->has_quoted_part = 0;
|
---|
| 2229 | if (o->data)
|
---|
| 2230 | o->data[0] = '\0';
|
---|
[821] | 2231 | }
|
---|
| 2232 |
|
---|
[2725] | 2233 | static void o_free(o_string *o)
|
---|
[821] | 2234 | {
|
---|
[2725] | 2235 | free(o->data);
|
---|
| 2236 | memset(o, 0, sizeof(*o));
|
---|
[821] | 2237 | }
|
---|
| 2238 |
|
---|
[2725] | 2239 | static ALWAYS_INLINE void o_free_unsafe(o_string *o)
|
---|
[821] | 2240 | {
|
---|
[2725] | 2241 | free(o->data);
|
---|
| 2242 | }
|
---|
| 2243 |
|
---|
| 2244 | static void o_grow_by(o_string *o, int len)
|
---|
| 2245 | {
|
---|
| 2246 | if (o->length + len > o->maxlen) {
|
---|
| 2247 | o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
|
---|
| 2248 | o->data = xrealloc(o->data, 1 + o->maxlen);
|
---|
[821] | 2249 | }
|
---|
| 2250 | }
|
---|
| 2251 |
|
---|
[2725] | 2252 | static void o_addchr(o_string *o, int ch)
|
---|
[821] | 2253 | {
|
---|
[2725] | 2254 | debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
|
---|
| 2255 | o_grow_by(o, 1);
|
---|
| 2256 | o->data[o->length] = ch;
|
---|
| 2257 | o->length++;
|
---|
| 2258 | o->data[o->length] = '\0';
|
---|
| 2259 | }
|
---|
[821] | 2260 |
|
---|
[2725] | 2261 | static void o_addblock(o_string *o, const char *str, int len)
|
---|
| 2262 | {
|
---|
| 2263 | o_grow_by(o, len);
|
---|
| 2264 | memcpy(&o->data[o->length], str, len);
|
---|
| 2265 | o->length += len;
|
---|
| 2266 | o->data[o->length] = '\0';
|
---|
| 2267 | }
|
---|
[821] | 2268 |
|
---|
[2725] | 2269 | static void o_addstr(o_string *o, const char *str)
|
---|
| 2270 | {
|
---|
| 2271 | o_addblock(o, str, strlen(str));
|
---|
[821] | 2272 | }
|
---|
| 2273 |
|
---|
[2725] | 2274 | #if !BB_MMU
|
---|
| 2275 | static void nommu_addchr(o_string *o, int ch)
|
---|
[821] | 2276 | {
|
---|
[2725] | 2277 | if (o)
|
---|
| 2278 | o_addchr(o, ch);
|
---|
[821] | 2279 | }
|
---|
[2725] | 2280 | #else
|
---|
| 2281 | # define nommu_addchr(o, str) ((void)0)
|
---|
| 2282 | #endif
|
---|
[821] | 2283 |
|
---|
[2725] | 2284 | static void o_addstr_with_NUL(o_string *o, const char *str)
|
---|
[821] | 2285 | {
|
---|
[2725] | 2286 | o_addblock(o, str, strlen(str) + 1);
|
---|
| 2287 | }
|
---|
[1765] | 2288 |
|
---|
[2725] | 2289 | /*
|
---|
| 2290 | * HUSH_BRACE_EXPANSION code needs corresponding quoting on variable expansion side.
|
---|
| 2291 | * Currently, "v='{q,w}'; echo $v" erroneously expands braces in $v.
|
---|
| 2292 | * Apparently, on unquoted $v bash still does globbing
|
---|
| 2293 | * ("v='*.txt'; echo $v" prints all .txt files),
|
---|
| 2294 | * but NOT brace expansion! Thus, there should be TWO independent
|
---|
| 2295 | * quoting mechanisms on $v expansion side: one protects
|
---|
| 2296 | * $v from brace expansion, and other additionally protects "$v" against globbing.
|
---|
| 2297 | * We have only second one.
|
---|
| 2298 | */
|
---|
[1765] | 2299 |
|
---|
[2725] | 2300 | #if ENABLE_HUSH_BRACE_EXPANSION
|
---|
| 2301 | # define MAYBE_BRACES "{}"
|
---|
| 2302 | #else
|
---|
| 2303 | # define MAYBE_BRACES ""
|
---|
| 2304 | #endif
|
---|
[1765] | 2305 |
|
---|
[2725] | 2306 | /* My analysis of quoting semantics tells me that state information
|
---|
| 2307 | * is associated with a destination, not a source.
|
---|
| 2308 | */
|
---|
| 2309 | static void o_addqchr(o_string *o, int ch)
|
---|
| 2310 | {
|
---|
| 2311 | int sz = 1;
|
---|
| 2312 | char *found = strchr("*?[\\" MAYBE_BRACES, ch);
|
---|
| 2313 | if (found)
|
---|
| 2314 | sz++;
|
---|
| 2315 | o_grow_by(o, sz);
|
---|
| 2316 | if (found) {
|
---|
| 2317 | o->data[o->length] = '\\';
|
---|
| 2318 | o->length++;
|
---|
[1765] | 2319 | }
|
---|
[2725] | 2320 | o->data[o->length] = ch;
|
---|
| 2321 | o->length++;
|
---|
| 2322 | o->data[o->length] = '\0';
|
---|
| 2323 | }
|
---|
[821] | 2324 |
|
---|
[2725] | 2325 | static void o_addQchr(o_string *o, int ch)
|
---|
| 2326 | {
|
---|
| 2327 | int sz = 1;
|
---|
| 2328 | if ((o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)
|
---|
| 2329 | && strchr("*?[\\" MAYBE_BRACES, ch)
|
---|
| 2330 | ) {
|
---|
| 2331 | sz++;
|
---|
| 2332 | o->data[o->length] = '\\';
|
---|
| 2333 | o->length++;
|
---|
[1765] | 2334 | }
|
---|
[2725] | 2335 | o_grow_by(o, sz);
|
---|
| 2336 | o->data[o->length] = ch;
|
---|
| 2337 | o->length++;
|
---|
| 2338 | o->data[o->length] = '\0';
|
---|
[1765] | 2339 | }
|
---|
[821] | 2340 |
|
---|
[2725] | 2341 | static void o_addqblock(o_string *o, const char *str, int len)
|
---|
[1765] | 2342 | {
|
---|
[2725] | 2343 | while (len) {
|
---|
| 2344 | char ch;
|
---|
| 2345 | int sz;
|
---|
| 2346 | int ordinary_cnt = strcspn(str, "*?[\\" MAYBE_BRACES);
|
---|
| 2347 | if (ordinary_cnt > len) /* paranoia */
|
---|
| 2348 | ordinary_cnt = len;
|
---|
| 2349 | o_addblock(o, str, ordinary_cnt);
|
---|
| 2350 | if (ordinary_cnt == len)
|
---|
[3232] | 2351 | return; /* NUL is already added by o_addblock */
|
---|
[2725] | 2352 | str += ordinary_cnt;
|
---|
| 2353 | len -= ordinary_cnt + 1; /* we are processing + 1 char below */
|
---|
[1765] | 2354 |
|
---|
[2725] | 2355 | ch = *str++;
|
---|
| 2356 | sz = 1;
|
---|
| 2357 | if (ch) { /* it is necessarily one of "*?[\\" MAYBE_BRACES */
|
---|
| 2358 | sz++;
|
---|
| 2359 | o->data[o->length] = '\\';
|
---|
| 2360 | o->length++;
|
---|
| 2361 | }
|
---|
| 2362 | o_grow_by(o, sz);
|
---|
| 2363 | o->data[o->length] = ch;
|
---|
| 2364 | o->length++;
|
---|
[1765] | 2365 | }
|
---|
[3232] | 2366 | o->data[o->length] = '\0';
|
---|
[2725] | 2367 | }
|
---|
[1765] | 2368 |
|
---|
[2725] | 2369 | static void o_addQblock(o_string *o, const char *str, int len)
|
---|
| 2370 | {
|
---|
| 2371 | if (!(o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS)) {
|
---|
| 2372 | o_addblock(o, str, len);
|
---|
| 2373 | return;
|
---|
[821] | 2374 | }
|
---|
[2725] | 2375 | o_addqblock(o, str, len);
|
---|
[821] | 2376 | }
|
---|
| 2377 |
|
---|
[2725] | 2378 | static void o_addQstr(o_string *o, const char *str)
|
---|
[1765] | 2379 | {
|
---|
[2725] | 2380 | o_addQblock(o, str, strlen(str));
|
---|
[1765] | 2381 | }
|
---|
| 2382 |
|
---|
[2725] | 2383 | /* A special kind of o_string for $VAR and `cmd` expansion.
|
---|
| 2384 | * It contains char* list[] at the beginning, which is grown in 16 element
|
---|
| 2385 | * increments. Actual string data starts at the next multiple of 16 * (char*).
|
---|
| 2386 | * list[i] contains an INDEX (int!) into this string data.
|
---|
| 2387 | * It means that if list[] needs to grow, data needs to be moved higher up
|
---|
| 2388 | * but list[i]'s need not be modified.
|
---|
| 2389 | * NB: remembering how many list[i]'s you have there is crucial.
|
---|
| 2390 | * o_finalize_list() operation post-processes this structure - calculates
|
---|
| 2391 | * and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well.
|
---|
| 2392 | */
|
---|
| 2393 | #if DEBUG_EXPAND || DEBUG_GLOB
|
---|
| 2394 | static void debug_print_list(const char *prefix, o_string *o, int n)
|
---|
[821] | 2395 | {
|
---|
[2725] | 2396 | char **list = (char**)o->data;
|
---|
| 2397 | int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
---|
| 2398 | int i = 0;
|
---|
[821] | 2399 |
|
---|
[2725] | 2400 | indent();
|
---|
| 2401 | fdprintf(2, "%s: list:%p n:%d string_start:%d length:%d maxlen:%d glob:%d quoted:%d escape:%d\n",
|
---|
| 2402 | prefix, list, n, string_start, o->length, o->maxlen,
|
---|
| 2403 | !!(o->o_expflags & EXP_FLAG_GLOB),
|
---|
| 2404 | o->has_quoted_part,
|
---|
| 2405 | !!(o->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
|
---|
| 2406 | while (i < n) {
|
---|
| 2407 | indent();
|
---|
| 2408 | fdprintf(2, " list[%d]=%d '%s' %p\n", i, (int)(uintptr_t)list[i],
|
---|
| 2409 | o->data + (int)(uintptr_t)list[i] + string_start,
|
---|
| 2410 | o->data + (int)(uintptr_t)list[i] + string_start);
|
---|
| 2411 | i++;
|
---|
[821] | 2412 | }
|
---|
[2725] | 2413 | if (n) {
|
---|
| 2414 | const char *p = o->data + (int)(uintptr_t)list[n - 1] + string_start;
|
---|
| 2415 | indent();
|
---|
| 2416 | fdprintf(2, " total_sz:%ld\n", (long)((p + strlen(p) + 1) - o->data));
|
---|
[1765] | 2417 | }
|
---|
[821] | 2418 | }
|
---|
[2725] | 2419 | #else
|
---|
| 2420 | # define debug_print_list(prefix, o, n) ((void)0)
|
---|
| 2421 | #endif
|
---|
[821] | 2422 |
|
---|
[2725] | 2423 | /* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value
|
---|
| 2424 | * in list[n] so that it points past last stored byte so far.
|
---|
| 2425 | * It returns n+1. */
|
---|
| 2426 | static int o_save_ptr_helper(o_string *o, int n)
|
---|
[821] | 2427 | {
|
---|
[2725] | 2428 | char **list = (char**)o->data;
|
---|
| 2429 | int string_start;
|
---|
| 2430 | int string_len;
|
---|
[821] | 2431 |
|
---|
[2725] | 2432 | if (!o->has_empty_slot) {
|
---|
| 2433 | string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
---|
| 2434 | string_len = o->length - string_start;
|
---|
| 2435 | if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */
|
---|
| 2436 | debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start);
|
---|
| 2437 | /* list[n] points to string_start, make space for 16 more pointers */
|
---|
| 2438 | o->maxlen += 0x10 * sizeof(list[0]);
|
---|
| 2439 | o->data = xrealloc(o->data, o->maxlen + 1);
|
---|
| 2440 | list = (char**)o->data;
|
---|
| 2441 | memmove(list + n + 0x10, list + n, string_len);
|
---|
| 2442 | o->length += 0x10 * sizeof(list[0]);
|
---|
| 2443 | } else {
|
---|
| 2444 | debug_printf_list("list[%d]=%d string_start=%d\n",
|
---|
| 2445 | n, string_len, string_start);
|
---|
| 2446 | }
|
---|
[821] | 2447 | } else {
|
---|
[2725] | 2448 | /* We have empty slot at list[n], reuse without growth */
|
---|
| 2449 | string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */
|
---|
| 2450 | string_len = o->length - string_start;
|
---|
| 2451 | debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n",
|
---|
| 2452 | n, string_len, string_start);
|
---|
| 2453 | o->has_empty_slot = 0;
|
---|
[821] | 2454 | }
|
---|
[3232] | 2455 | o->has_quoted_part = 0;
|
---|
[2725] | 2456 | list[n] = (char*)(uintptr_t)string_len;
|
---|
| 2457 | return n + 1;
|
---|
[1765] | 2458 | }
|
---|
[821] | 2459 |
|
---|
[2725] | 2460 | /* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */
|
---|
| 2461 | static int o_get_last_ptr(o_string *o, int n)
|
---|
[1765] | 2462 | {
|
---|
[2725] | 2463 | char **list = (char**)o->data;
|
---|
| 2464 | int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
---|
| 2465 |
|
---|
| 2466 | return ((int)(uintptr_t)list[n-1]) + string_start;
|
---|
[821] | 2467 | }
|
---|
| 2468 |
|
---|
[2725] | 2469 | #if ENABLE_HUSH_BRACE_EXPANSION
|
---|
| 2470 | /* There in a GNU extension, GLOB_BRACE, but it is not usable:
|
---|
| 2471 | * first, it processes even {a} (no commas), second,
|
---|
| 2472 | * I didn't manage to make it return strings when they don't match
|
---|
| 2473 | * existing files. Need to re-implement it.
|
---|
| 2474 | */
|
---|
| 2475 |
|
---|
| 2476 | /* Helper */
|
---|
| 2477 | static int glob_needed(const char *s)
|
---|
[821] | 2478 | {
|
---|
[2725] | 2479 | while (*s) {
|
---|
| 2480 | if (*s == '\\') {
|
---|
| 2481 | if (!s[1])
|
---|
| 2482 | return 0;
|
---|
| 2483 | s += 2;
|
---|
| 2484 | continue;
|
---|
| 2485 | }
|
---|
| 2486 | if (*s == '*' || *s == '[' || *s == '?' || *s == '{')
|
---|
| 2487 | return 1;
|
---|
| 2488 | s++;
|
---|
[821] | 2489 | }
|
---|
[2725] | 2490 | return 0;
|
---|
| 2491 | }
|
---|
| 2492 | /* Return pointer to next closing brace or to comma */
|
---|
| 2493 | static const char *next_brace_sub(const char *cp)
|
---|
| 2494 | {
|
---|
| 2495 | unsigned depth = 0;
|
---|
| 2496 | cp++;
|
---|
| 2497 | while (*cp != '\0') {
|
---|
| 2498 | if (*cp == '\\') {
|
---|
| 2499 | if (*++cp == '\0')
|
---|
| 2500 | break;
|
---|
| 2501 | cp++;
|
---|
| 2502 | continue;
|
---|
| 2503 | }
|
---|
| 2504 | if ((*cp == '}' && depth-- == 0) || (*cp == ',' && depth == 0))
|
---|
| 2505 | break;
|
---|
| 2506 | if (*cp++ == '{')
|
---|
| 2507 | depth++;
|
---|
| 2508 | }
|
---|
[821] | 2509 |
|
---|
[2725] | 2510 | return *cp != '\0' ? cp : NULL;
|
---|
| 2511 | }
|
---|
| 2512 | /* Recursive brace globber. Note: may garble pattern[]. */
|
---|
| 2513 | static int glob_brace(char *pattern, o_string *o, int n)
|
---|
| 2514 | {
|
---|
| 2515 | char *new_pattern_buf;
|
---|
| 2516 | const char *begin;
|
---|
| 2517 | const char *next;
|
---|
| 2518 | const char *rest;
|
---|
| 2519 | const char *p;
|
---|
| 2520 | size_t rest_len;
|
---|
[1765] | 2521 |
|
---|
[2725] | 2522 | debug_printf_glob("glob_brace('%s')\n", pattern);
|
---|
[1765] | 2523 |
|
---|
[2725] | 2524 | begin = pattern;
|
---|
| 2525 | while (1) {
|
---|
| 2526 | if (*begin == '\0')
|
---|
| 2527 | goto simple_glob;
|
---|
| 2528 | if (*begin == '{') {
|
---|
| 2529 | /* Find the first sub-pattern and at the same time
|
---|
| 2530 | * find the rest after the closing brace */
|
---|
| 2531 | next = next_brace_sub(begin);
|
---|
| 2532 | if (next == NULL) {
|
---|
| 2533 | /* An illegal expression */
|
---|
| 2534 | goto simple_glob;
|
---|
[821] | 2535 | }
|
---|
[2725] | 2536 | if (*next == '}') {
|
---|
| 2537 | /* "{abc}" with no commas - illegal
|
---|
| 2538 | * brace expr, disregard and skip it */
|
---|
| 2539 | begin = next + 1;
|
---|
| 2540 | continue;
|
---|
| 2541 | }
|
---|
| 2542 | break;
|
---|
[821] | 2543 | }
|
---|
[2725] | 2544 | if (*begin == '\\' && begin[1] != '\0')
|
---|
| 2545 | begin++;
|
---|
| 2546 | begin++;
|
---|
| 2547 | }
|
---|
| 2548 | debug_printf_glob("begin:%s\n", begin);
|
---|
| 2549 | debug_printf_glob("next:%s\n", next);
|
---|
[821] | 2550 |
|
---|
[2725] | 2551 | /* Now find the end of the whole brace expression */
|
---|
| 2552 | rest = next;
|
---|
| 2553 | while (*rest != '}') {
|
---|
| 2554 | rest = next_brace_sub(rest);
|
---|
| 2555 | if (rest == NULL) {
|
---|
| 2556 | /* An illegal expression */
|
---|
| 2557 | goto simple_glob;
|
---|
[821] | 2558 | }
|
---|
[2725] | 2559 | debug_printf_glob("rest:%s\n", rest);
|
---|
| 2560 | }
|
---|
| 2561 | rest_len = strlen(++rest) + 1;
|
---|
[821] | 2562 |
|
---|
[2725] | 2563 | /* We are sure the brace expression is well-formed */
|
---|
[821] | 2564 |
|
---|
[2725] | 2565 | /* Allocate working buffer large enough for our work */
|
---|
| 2566 | new_pattern_buf = xmalloc(strlen(pattern));
|
---|
| 2567 |
|
---|
| 2568 | /* We have a brace expression. BEGIN points to the opening {,
|
---|
| 2569 | * NEXT points past the terminator of the first element, and REST
|
---|
| 2570 | * points past the final }. We will accumulate result names from
|
---|
| 2571 | * recursive runs for each brace alternative in the buffer using
|
---|
| 2572 | * GLOB_APPEND. */
|
---|
| 2573 |
|
---|
| 2574 | p = begin + 1;
|
---|
| 2575 | while (1) {
|
---|
| 2576 | /* Construct the new glob expression */
|
---|
| 2577 | memcpy(
|
---|
| 2578 | mempcpy(
|
---|
| 2579 | mempcpy(new_pattern_buf,
|
---|
| 2580 | /* We know the prefix for all sub-patterns */
|
---|
| 2581 | pattern, begin - pattern),
|
---|
| 2582 | p, next - p),
|
---|
| 2583 | rest, rest_len);
|
---|
| 2584 |
|
---|
| 2585 | /* Note: glob_brace() may garble new_pattern_buf[].
|
---|
| 2586 | * That's why we re-copy prefix every time (1st memcpy above).
|
---|
| 2587 | */
|
---|
| 2588 | n = glob_brace(new_pattern_buf, o, n);
|
---|
| 2589 | if (*next == '}') {
|
---|
| 2590 | /* We saw the last entry */
|
---|
| 2591 | break;
|
---|
| 2592 | }
|
---|
| 2593 | p = next + 1;
|
---|
| 2594 | next = next_brace_sub(next);
|
---|
| 2595 | }
|
---|
| 2596 | free(new_pattern_buf);
|
---|
| 2597 | return n;
|
---|
| 2598 |
|
---|
| 2599 | simple_glob:
|
---|
| 2600 | {
|
---|
| 2601 | int gr;
|
---|
| 2602 | glob_t globdata;
|
---|
| 2603 |
|
---|
| 2604 | memset(&globdata, 0, sizeof(globdata));
|
---|
| 2605 | gr = glob(pattern, 0, NULL, &globdata);
|
---|
| 2606 | debug_printf_glob("glob('%s'):%d\n", pattern, gr);
|
---|
| 2607 | if (gr != 0) {
|
---|
| 2608 | if (gr == GLOB_NOMATCH) {
|
---|
| 2609 | globfree(&globdata);
|
---|
| 2610 | /* NB: garbles parameter */
|
---|
| 2611 | unbackslash(pattern);
|
---|
| 2612 | o_addstr_with_NUL(o, pattern);
|
---|
| 2613 | debug_printf_glob("glob pattern '%s' is literal\n", pattern);
|
---|
| 2614 | return o_save_ptr_helper(o, n);
|
---|
[821] | 2615 | }
|
---|
[2725] | 2616 | if (gr == GLOB_NOSPACE)
|
---|
| 2617 | bb_error_msg_and_die(bb_msg_memory_exhausted);
|
---|
| 2618 | /* GLOB_ABORTED? Only happens with GLOB_ERR flag,
|
---|
| 2619 | * but we didn't specify it. Paranoia again. */
|
---|
| 2620 | bb_error_msg_and_die("glob error %d on '%s'", gr, pattern);
|
---|
[1765] | 2621 | }
|
---|
[2725] | 2622 | if (globdata.gl_pathv && globdata.gl_pathv[0]) {
|
---|
| 2623 | char **argv = globdata.gl_pathv;
|
---|
| 2624 | while (1) {
|
---|
| 2625 | o_addstr_with_NUL(o, *argv);
|
---|
| 2626 | n = o_save_ptr_helper(o, n);
|
---|
| 2627 | argv++;
|
---|
| 2628 | if (!*argv)
|
---|
| 2629 | break;
|
---|
| 2630 | }
|
---|
| 2631 | }
|
---|
| 2632 | globfree(&globdata);
|
---|
[821] | 2633 | }
|
---|
[2725] | 2634 | return n;
|
---|
| 2635 | }
|
---|
| 2636 | /* Performs globbing on last list[],
|
---|
| 2637 | * saving each result as a new list[].
|
---|
| 2638 | */
|
---|
| 2639 | static int perform_glob(o_string *o, int n)
|
---|
| 2640 | {
|
---|
| 2641 | char *pattern, *copy;
|
---|
[821] | 2642 |
|
---|
[2725] | 2643 | debug_printf_glob("start perform_glob: n:%d o->data:%p\n", n, o->data);
|
---|
| 2644 | if (!o->data)
|
---|
| 2645 | return o_save_ptr_helper(o, n);
|
---|
| 2646 | pattern = o->data + o_get_last_ptr(o, n);
|
---|
| 2647 | debug_printf_glob("glob pattern '%s'\n", pattern);
|
---|
| 2648 | if (!glob_needed(pattern)) {
|
---|
| 2649 | /* unbackslash last string in o in place, fix length */
|
---|
| 2650 | o->length = unbackslash(pattern) - o->data;
|
---|
| 2651 | debug_printf_glob("glob pattern '%s' is literal\n", pattern);
|
---|
| 2652 | return o_save_ptr_helper(o, n);
|
---|
| 2653 | }
|
---|
[1765] | 2654 |
|
---|
[2725] | 2655 | copy = xstrdup(pattern);
|
---|
| 2656 | /* "forget" pattern in o */
|
---|
| 2657 | o->length = pattern - o->data;
|
---|
| 2658 | n = glob_brace(copy, o, n);
|
---|
| 2659 | free(copy);
|
---|
| 2660 | if (DEBUG_GLOB)
|
---|
| 2661 | debug_print_list("perform_glob returning", o, n);
|
---|
| 2662 | return n;
|
---|
[821] | 2663 | }
|
---|
| 2664 |
|
---|
[2725] | 2665 | #else /* !HUSH_BRACE_EXPANSION */
|
---|
| 2666 |
|
---|
| 2667 | /* Helper */
|
---|
| 2668 | static int glob_needed(const char *s)
|
---|
[821] | 2669 | {
|
---|
[2725] | 2670 | while (*s) {
|
---|
| 2671 | if (*s == '\\') {
|
---|
| 2672 | if (!s[1])
|
---|
| 2673 | return 0;
|
---|
| 2674 | s += 2;
|
---|
| 2675 | continue;
|
---|
| 2676 | }
|
---|
| 2677 | if (*s == '*' || *s == '[' || *s == '?')
|
---|
| 2678 | return 1;
|
---|
| 2679 | s++;
|
---|
| 2680 | }
|
---|
| 2681 | return 0;
|
---|
[821] | 2682 | }
|
---|
[2725] | 2683 | /* Performs globbing on last list[],
|
---|
| 2684 | * saving each result as a new list[].
|
---|
[821] | 2685 | */
|
---|
[2725] | 2686 | static int perform_glob(o_string *o, int n)
|
---|
[821] | 2687 | {
|
---|
[2725] | 2688 | glob_t globdata;
|
---|
| 2689 | int gr;
|
---|
| 2690 | char *pattern;
|
---|
[821] | 2691 |
|
---|
[2725] | 2692 | debug_printf_glob("start perform_glob: n:%d o->data:%p\n", n, o->data);
|
---|
| 2693 | if (!o->data)
|
---|
| 2694 | return o_save_ptr_helper(o, n);
|
---|
| 2695 | pattern = o->data + o_get_last_ptr(o, n);
|
---|
| 2696 | debug_printf_glob("glob pattern '%s'\n", pattern);
|
---|
| 2697 | if (!glob_needed(pattern)) {
|
---|
| 2698 | literal:
|
---|
| 2699 | /* unbackslash last string in o in place, fix length */
|
---|
| 2700 | o->length = unbackslash(pattern) - o->data;
|
---|
| 2701 | debug_printf_glob("glob pattern '%s' is literal\n", pattern);
|
---|
| 2702 | return o_save_ptr_helper(o, n);
|
---|
| 2703 | }
|
---|
[1765] | 2704 |
|
---|
[2725] | 2705 | memset(&globdata, 0, sizeof(globdata));
|
---|
| 2706 | /* Can't use GLOB_NOCHECK: it does not unescape the string.
|
---|
| 2707 | * If we glob "*.\*" and don't find anything, we need
|
---|
| 2708 | * to fall back to using literal "*.*", but GLOB_NOCHECK
|
---|
| 2709 | * will return "*.\*"!
|
---|
[821] | 2710 | */
|
---|
[2725] | 2711 | gr = glob(pattern, 0, NULL, &globdata);
|
---|
| 2712 | debug_printf_glob("glob('%s'):%d\n", pattern, gr);
|
---|
| 2713 | if (gr != 0) {
|
---|
| 2714 | if (gr == GLOB_NOMATCH) {
|
---|
| 2715 | globfree(&globdata);
|
---|
| 2716 | goto literal;
|
---|
| 2717 | }
|
---|
| 2718 | if (gr == GLOB_NOSPACE)
|
---|
| 2719 | bb_error_msg_and_die(bb_msg_memory_exhausted);
|
---|
| 2720 | /* GLOB_ABORTED? Only happens with GLOB_ERR flag,
|
---|
| 2721 | * but we didn't specify it. Paranoia again. */
|
---|
| 2722 | bb_error_msg_and_die("glob error %d on '%s'", gr, pattern);
|
---|
[1765] | 2723 | }
|
---|
[2725] | 2724 | if (globdata.gl_pathv && globdata.gl_pathv[0]) {
|
---|
| 2725 | char **argv = globdata.gl_pathv;
|
---|
| 2726 | /* "forget" pattern in o */
|
---|
| 2727 | o->length = pattern - o->data;
|
---|
| 2728 | while (1) {
|
---|
| 2729 | o_addstr_with_NUL(o, *argv);
|
---|
| 2730 | n = o_save_ptr_helper(o, n);
|
---|
| 2731 | argv++;
|
---|
| 2732 | if (!*argv)
|
---|
| 2733 | break;
|
---|
| 2734 | }
|
---|
| 2735 | }
|
---|
| 2736 | globfree(&globdata);
|
---|
| 2737 | if (DEBUG_GLOB)
|
---|
| 2738 | debug_print_list("perform_glob returning", o, n);
|
---|
| 2739 | return n;
|
---|
| 2740 | }
|
---|
[1765] | 2741 |
|
---|
[2725] | 2742 | #endif /* !HUSH_BRACE_EXPANSION */
|
---|
[1765] | 2743 |
|
---|
[2725] | 2744 | /* If o->o_expflags & EXP_FLAG_GLOB, glob the string so far remembered.
|
---|
| 2745 | * Otherwise, just finish current list[] and start new */
|
---|
| 2746 | static int o_save_ptr(o_string *o, int n)
|
---|
| 2747 | {
|
---|
| 2748 | if (o->o_expflags & EXP_FLAG_GLOB) {
|
---|
| 2749 | /* If o->has_empty_slot, list[n] was already globbed
|
---|
| 2750 | * (if it was requested back then when it was filled)
|
---|
| 2751 | * so don't do that again! */
|
---|
| 2752 | if (!o->has_empty_slot)
|
---|
| 2753 | return perform_glob(o, n); /* o_save_ptr_helper is inside */
|
---|
[821] | 2754 | }
|
---|
[2725] | 2755 | return o_save_ptr_helper(o, n);
|
---|
| 2756 | }
|
---|
[821] | 2757 |
|
---|
[2725] | 2758 | /* "Please convert list[n] to real char* ptrs, and NULL terminate it." */
|
---|
| 2759 | static char **o_finalize_list(o_string *o, int n)
|
---|
| 2760 | {
|
---|
| 2761 | char **list;
|
---|
| 2762 | int string_start;
|
---|
[1765] | 2763 |
|
---|
[2725] | 2764 | n = o_save_ptr(o, n); /* force growth for list[n] if necessary */
|
---|
| 2765 | if (DEBUG_EXPAND)
|
---|
| 2766 | debug_print_list("finalized", o, n);
|
---|
| 2767 | debug_printf_expand("finalized n:%d\n", n);
|
---|
| 2768 | list = (char**)o->data;
|
---|
| 2769 | string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
---|
| 2770 | list[--n] = NULL;
|
---|
| 2771 | while (n) {
|
---|
| 2772 | n--;
|
---|
| 2773 | list[n] = o->data + (int)(uintptr_t)list[n] + string_start;
|
---|
| 2774 | }
|
---|
| 2775 | return list;
|
---|
| 2776 | }
|
---|
[1765] | 2777 |
|
---|
[2725] | 2778 | static void free_pipe_list(struct pipe *pi);
|
---|
[821] | 2779 |
|
---|
[2725] | 2780 | /* Returns pi->next - next pipe in the list */
|
---|
| 2781 | static struct pipe *free_pipe(struct pipe *pi)
|
---|
| 2782 | {
|
---|
| 2783 | struct pipe *next;
|
---|
| 2784 | int i;
|
---|
[821] | 2785 |
|
---|
[2725] | 2786 | debug_printf_clean("free_pipe (pid %d)\n", getpid());
|
---|
| 2787 | for (i = 0; i < pi->num_cmds; i++) {
|
---|
| 2788 | struct command *command;
|
---|
| 2789 | struct redir_struct *r, *rnext;
|
---|
| 2790 |
|
---|
| 2791 | command = &pi->cmds[i];
|
---|
| 2792 | debug_printf_clean(" command %d:\n", i);
|
---|
| 2793 | if (command->argv) {
|
---|
| 2794 | if (DEBUG_CLEAN) {
|
---|
| 2795 | int a;
|
---|
| 2796 | char **p;
|
---|
| 2797 | for (a = 0, p = command->argv; *p; a++, p++) {
|
---|
| 2798 | debug_printf_clean(" argv[%d] = %s\n", a, *p);
|
---|
[1765] | 2799 | }
|
---|
| 2800 | }
|
---|
[2725] | 2801 | free_strings(command->argv);
|
---|
| 2802 | //command->argv = NULL;
|
---|
| 2803 | }
|
---|
| 2804 | /* not "else if": on syntax error, we may have both! */
|
---|
| 2805 | if (command->group) {
|
---|
| 2806 | debug_printf_clean(" begin group (cmd_type:%d)\n",
|
---|
| 2807 | command->cmd_type);
|
---|
| 2808 | free_pipe_list(command->group);
|
---|
| 2809 | debug_printf_clean(" end group\n");
|
---|
| 2810 | //command->group = NULL;
|
---|
| 2811 | }
|
---|
| 2812 | /* else is crucial here.
|
---|
| 2813 | * If group != NULL, child_func is meaningless */
|
---|
| 2814 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 2815 | else if (command->child_func) {
|
---|
| 2816 | debug_printf_exec("cmd %p releases child func at %p\n", command, command->child_func);
|
---|
| 2817 | command->child_func->parent_cmd = NULL;
|
---|
| 2818 | }
|
---|
[1765] | 2819 | #endif
|
---|
[2725] | 2820 | #if !BB_MMU
|
---|
| 2821 | free(command->group_as_string);
|
---|
| 2822 | //command->group_as_string = NULL;
|
---|
| 2823 | #endif
|
---|
| 2824 | for (r = command->redirects; r; r = rnext) {
|
---|
| 2825 | debug_printf_clean(" redirect %d%s",
|
---|
| 2826 | r->rd_fd, redir_table[r->rd_type].descrip);
|
---|
| 2827 | /* guard against the case >$FOO, where foo is unset or blank */
|
---|
| 2828 | if (r->rd_filename) {
|
---|
| 2829 | debug_printf_clean(" fname:'%s'\n", r->rd_filename);
|
---|
| 2830 | free(r->rd_filename);
|
---|
| 2831 | //r->rd_filename = NULL;
|
---|
[821] | 2832 | }
|
---|
[2725] | 2833 | debug_printf_clean(" rd_dup:%d\n", r->rd_dup);
|
---|
| 2834 | rnext = r->next;
|
---|
| 2835 | free(r);
|
---|
[821] | 2836 | }
|
---|
[2725] | 2837 | //command->redirects = NULL;
|
---|
| 2838 | }
|
---|
| 2839 | free(pi->cmds); /* children are an array, they get freed all at once */
|
---|
| 2840 | //pi->cmds = NULL;
|
---|
| 2841 | #if ENABLE_HUSH_JOB
|
---|
| 2842 | free(pi->cmdtext);
|
---|
| 2843 | //pi->cmdtext = NULL;
|
---|
| 2844 | #endif
|
---|
[821] | 2845 |
|
---|
[2725] | 2846 | next = pi->next;
|
---|
| 2847 | free(pi);
|
---|
| 2848 | return next;
|
---|
| 2849 | }
|
---|
[821] | 2850 |
|
---|
[2725] | 2851 | static void free_pipe_list(struct pipe *pi)
|
---|
| 2852 | {
|
---|
| 2853 | while (pi) {
|
---|
| 2854 | #if HAS_KEYWORDS
|
---|
| 2855 | debug_printf_clean("pipe reserved word %d\n", pi->res_word);
|
---|
[1765] | 2856 | #endif
|
---|
[2725] | 2857 | debug_printf_clean("pipe followup code %d\n", pi->followup);
|
---|
| 2858 | pi = free_pipe(pi);
|
---|
[821] | 2859 | }
|
---|
| 2860 | }
|
---|
| 2861 |
|
---|
[2725] | 2862 |
|
---|
| 2863 | /*** Parsing routines ***/
|
---|
| 2864 |
|
---|
[1765] | 2865 | #ifndef debug_print_tree
|
---|
| 2866 | static void debug_print_tree(struct pipe *pi, int lvl)
|
---|
| 2867 | {
|
---|
[2725] | 2868 | static const char *const PIPE[] = {
|
---|
[1765] | 2869 | [PIPE_SEQ] = "SEQ",
|
---|
| 2870 | [PIPE_AND] = "AND",
|
---|
| 2871 | [PIPE_OR ] = "OR" ,
|
---|
| 2872 | [PIPE_BG ] = "BG" ,
|
---|
| 2873 | };
|
---|
| 2874 | static const char *RES[] = {
|
---|
| 2875 | [RES_NONE ] = "NONE" ,
|
---|
[2725] | 2876 | # if ENABLE_HUSH_IF
|
---|
[1765] | 2877 | [RES_IF ] = "IF" ,
|
---|
| 2878 | [RES_THEN ] = "THEN" ,
|
---|
| 2879 | [RES_ELIF ] = "ELIF" ,
|
---|
| 2880 | [RES_ELSE ] = "ELSE" ,
|
---|
| 2881 | [RES_FI ] = "FI" ,
|
---|
[2725] | 2882 | # endif
|
---|
| 2883 | # if ENABLE_HUSH_LOOPS
|
---|
[1765] | 2884 | [RES_FOR ] = "FOR" ,
|
---|
| 2885 | [RES_WHILE] = "WHILE",
|
---|
| 2886 | [RES_UNTIL] = "UNTIL",
|
---|
| 2887 | [RES_DO ] = "DO" ,
|
---|
| 2888 | [RES_DONE ] = "DONE" ,
|
---|
[2725] | 2889 | # endif
|
---|
| 2890 | # if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
|
---|
[1765] | 2891 | [RES_IN ] = "IN" ,
|
---|
[2725] | 2892 | # endif
|
---|
| 2893 | # if ENABLE_HUSH_CASE
|
---|
| 2894 | [RES_CASE ] = "CASE" ,
|
---|
| 2895 | [RES_CASE_IN ] = "CASE_IN" ,
|
---|
| 2896 | [RES_MATCH] = "MATCH",
|
---|
| 2897 | [RES_CASE_BODY] = "CASE_BODY",
|
---|
| 2898 | [RES_ESAC ] = "ESAC" ,
|
---|
| 2899 | # endif
|
---|
[1765] | 2900 | [RES_XXXX ] = "XXXX" ,
|
---|
| 2901 | [RES_SNTX ] = "SNTX" ,
|
---|
| 2902 | };
|
---|
[2725] | 2903 | static const char *const CMDTYPE[] = {
|
---|
| 2904 | "{}",
|
---|
| 2905 | "()",
|
---|
| 2906 | "[noglob]",
|
---|
| 2907 | # if ENABLE_HUSH_FUNCTIONS
|
---|
| 2908 | "func()",
|
---|
| 2909 | # endif
|
---|
| 2910 | };
|
---|
[1765] | 2911 |
|
---|
| 2912 | int pin, prn;
|
---|
| 2913 |
|
---|
| 2914 | pin = 0;
|
---|
| 2915 | while (pi) {
|
---|
[2725] | 2916 | fdprintf(2, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
|
---|
[1765] | 2917 | pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
|
---|
| 2918 | prn = 0;
|
---|
[2725] | 2919 | while (prn < pi->num_cmds) {
|
---|
| 2920 | struct command *command = &pi->cmds[prn];
|
---|
| 2921 | char **argv = command->argv;
|
---|
[1765] | 2922 |
|
---|
[2725] | 2923 | fdprintf(2, "%*s cmd %d assignment_cnt:%d",
|
---|
| 2924 | lvl*2, "", prn,
|
---|
| 2925 | command->assignment_cnt);
|
---|
| 2926 | if (command->group) {
|
---|
| 2927 | fdprintf(2, " group %s: (argv=%p)%s%s\n",
|
---|
| 2928 | CMDTYPE[command->cmd_type],
|
---|
| 2929 | argv
|
---|
| 2930 | # if !BB_MMU
|
---|
| 2931 | , " group_as_string:", command->group_as_string
|
---|
| 2932 | # else
|
---|
| 2933 | , "", ""
|
---|
| 2934 | # endif
|
---|
| 2935 | );
|
---|
| 2936 | debug_print_tree(command->group, lvl+1);
|
---|
[1765] | 2937 | prn++;
|
---|
| 2938 | continue;
|
---|
| 2939 | }
|
---|
| 2940 | if (argv) while (*argv) {
|
---|
[2725] | 2941 | fdprintf(2, " '%s'", *argv);
|
---|
[1765] | 2942 | argv++;
|
---|
| 2943 | }
|
---|
[2725] | 2944 | fdprintf(2, "\n");
|
---|
[1765] | 2945 | prn++;
|
---|
| 2946 | }
|
---|
| 2947 | pi = pi->next;
|
---|
| 2948 | pin++;
|
---|
| 2949 | }
|
---|
| 2950 | }
|
---|
[2725] | 2951 | #endif /* debug_print_tree */
|
---|
[1765] | 2952 |
|
---|
[2725] | 2953 | static struct pipe *new_pipe(void)
|
---|
[821] | 2954 | {
|
---|
[2725] | 2955 | struct pipe *pi;
|
---|
| 2956 | pi = xzalloc(sizeof(struct pipe));
|
---|
| 2957 | /*pi->followup = 0; - deliberately invalid value */
|
---|
| 2958 | /*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */
|
---|
| 2959 | return pi;
|
---|
| 2960 | }
|
---|
| 2961 |
|
---|
| 2962 | /* Command (member of a pipe) is complete, or we start a new pipe
|
---|
| 2963 | * if ctx->command is NULL.
|
---|
| 2964 | * No errors possible here.
|
---|
| 2965 | */
|
---|
| 2966 | static int done_command(struct parse_context *ctx)
|
---|
| 2967 | {
|
---|
| 2968 | /* The command is really already in the pipe structure, so
|
---|
| 2969 | * advance the pipe counter and make a new, null command. */
|
---|
| 2970 | struct pipe *pi = ctx->pipe;
|
---|
| 2971 | struct command *command = ctx->command;
|
---|
| 2972 |
|
---|
| 2973 | if (command) {
|
---|
| 2974 | if (IS_NULL_CMD(command)) {
|
---|
| 2975 | debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
|
---|
| 2976 | goto clear_and_ret;
|
---|
| 2977 | }
|
---|
| 2978 | pi->num_cmds++;
|
---|
| 2979 | debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
|
---|
| 2980 | //debug_print_tree(ctx->list_head, 20);
|
---|
| 2981 | } else {
|
---|
| 2982 | debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
|
---|
| 2983 | }
|
---|
| 2984 |
|
---|
| 2985 | /* Only real trickiness here is that the uncommitted
|
---|
| 2986 | * command structure is not counted in pi->num_cmds. */
|
---|
| 2987 | pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
|
---|
| 2988 | ctx->command = command = &pi->cmds[pi->num_cmds];
|
---|
| 2989 | clear_and_ret:
|
---|
| 2990 | memset(command, 0, sizeof(*command));
|
---|
| 2991 | return pi->num_cmds; /* used only for 0/nonzero check */
|
---|
| 2992 | }
|
---|
| 2993 |
|
---|
| 2994 | static void done_pipe(struct parse_context *ctx, pipe_style type)
|
---|
| 2995 | {
|
---|
| 2996 | int not_null;
|
---|
| 2997 |
|
---|
| 2998 | debug_printf_parse("done_pipe entered, followup %d\n", type);
|
---|
| 2999 | /* Close previous command */
|
---|
| 3000 | not_null = done_command(ctx);
|
---|
| 3001 | ctx->pipe->followup = type;
|
---|
| 3002 | #if HAS_KEYWORDS
|
---|
| 3003 | ctx->pipe->pi_inverted = ctx->ctx_inverted;
|
---|
| 3004 | ctx->ctx_inverted = 0;
|
---|
| 3005 | ctx->pipe->res_word = ctx->ctx_res_w;
|
---|
[1765] | 3006 | #endif
|
---|
[2725] | 3007 |
|
---|
| 3008 | /* Without this check, even just <enter> on command line generates
|
---|
| 3009 | * tree of three NOPs (!). Which is harmless but annoying.
|
---|
| 3010 | * IOW: it is safe to do it unconditionally. */
|
---|
| 3011 | if (not_null
|
---|
[1765] | 3012 | #if ENABLE_HUSH_IF
|
---|
[2725] | 3013 | || ctx->ctx_res_w == RES_FI
|
---|
[1765] | 3014 | #endif
|
---|
[2725] | 3015 | #if ENABLE_HUSH_LOOPS
|
---|
| 3016 | || ctx->ctx_res_w == RES_DONE
|
---|
| 3017 | || ctx->ctx_res_w == RES_FOR
|
---|
| 3018 | || ctx->ctx_res_w == RES_IN
|
---|
| 3019 | #endif
|
---|
| 3020 | #if ENABLE_HUSH_CASE
|
---|
| 3021 | || ctx->ctx_res_w == RES_ESAC
|
---|
| 3022 | #endif
|
---|
| 3023 | ) {
|
---|
| 3024 | struct pipe *new_p;
|
---|
| 3025 | debug_printf_parse("done_pipe: adding new pipe: "
|
---|
| 3026 | "not_null:%d ctx->ctx_res_w:%d\n",
|
---|
| 3027 | not_null, ctx->ctx_res_w);
|
---|
| 3028 | new_p = new_pipe();
|
---|
| 3029 | ctx->pipe->next = new_p;
|
---|
| 3030 | ctx->pipe = new_p;
|
---|
| 3031 | /* RES_THEN, RES_DO etc are "sticky" -
|
---|
| 3032 | * they remain set for pipes inside if/while.
|
---|
| 3033 | * This is used to control execution.
|
---|
| 3034 | * RES_FOR and RES_IN are NOT sticky (needed to support
|
---|
| 3035 | * cases where variable or value happens to match a keyword):
|
---|
| 3036 | */
|
---|
| 3037 | #if ENABLE_HUSH_LOOPS
|
---|
| 3038 | if (ctx->ctx_res_w == RES_FOR
|
---|
| 3039 | || ctx->ctx_res_w == RES_IN)
|
---|
| 3040 | ctx->ctx_res_w = RES_NONE;
|
---|
| 3041 | #endif
|
---|
| 3042 | #if ENABLE_HUSH_CASE
|
---|
| 3043 | if (ctx->ctx_res_w == RES_MATCH)
|
---|
| 3044 | ctx->ctx_res_w = RES_CASE_BODY;
|
---|
| 3045 | if (ctx->ctx_res_w == RES_CASE)
|
---|
| 3046 | ctx->ctx_res_w = RES_CASE_IN;
|
---|
| 3047 | #endif
|
---|
| 3048 | ctx->command = NULL; /* trick done_command below */
|
---|
| 3049 | /* Create the memory for command, roughly:
|
---|
| 3050 | * ctx->pipe->cmds = new struct command;
|
---|
| 3051 | * ctx->command = &ctx->pipe->cmds[0];
|
---|
| 3052 | */
|
---|
| 3053 | done_command(ctx);
|
---|
| 3054 | //debug_print_tree(ctx->list_head, 10);
|
---|
| 3055 | }
|
---|
| 3056 | debug_printf_parse("done_pipe return\n");
|
---|
| 3057 | }
|
---|
[1765] | 3058 |
|
---|
[2725] | 3059 | static void initialize_context(struct parse_context *ctx)
|
---|
| 3060 | {
|
---|
| 3061 | memset(ctx, 0, sizeof(*ctx));
|
---|
| 3062 | ctx->pipe = ctx->list_head = new_pipe();
|
---|
| 3063 | /* Create the memory for command, roughly:
|
---|
| 3064 | * ctx->pipe->cmds = new struct command;
|
---|
| 3065 | * ctx->command = &ctx->pipe->cmds[0];
|
---|
| 3066 | */
|
---|
| 3067 | done_command(ctx);
|
---|
| 3068 | }
|
---|
[1765] | 3069 |
|
---|
[2725] | 3070 | /* If a reserved word is found and processed, parse context is modified
|
---|
| 3071 | * and 1 is returned.
|
---|
| 3072 | */
|
---|
| 3073 | #if HAS_KEYWORDS
|
---|
| 3074 | struct reserved_combo {
|
---|
| 3075 | char literal[6];
|
---|
| 3076 | unsigned char res;
|
---|
| 3077 | unsigned char assignment_flag;
|
---|
| 3078 | int flag;
|
---|
| 3079 | };
|
---|
| 3080 | enum {
|
---|
| 3081 | FLAG_END = (1 << RES_NONE ),
|
---|
| 3082 | # if ENABLE_HUSH_IF
|
---|
| 3083 | FLAG_IF = (1 << RES_IF ),
|
---|
| 3084 | FLAG_THEN = (1 << RES_THEN ),
|
---|
| 3085 | FLAG_ELIF = (1 << RES_ELIF ),
|
---|
| 3086 | FLAG_ELSE = (1 << RES_ELSE ),
|
---|
| 3087 | FLAG_FI = (1 << RES_FI ),
|
---|
| 3088 | # endif
|
---|
| 3089 | # if ENABLE_HUSH_LOOPS
|
---|
| 3090 | FLAG_FOR = (1 << RES_FOR ),
|
---|
| 3091 | FLAG_WHILE = (1 << RES_WHILE),
|
---|
| 3092 | FLAG_UNTIL = (1 << RES_UNTIL),
|
---|
| 3093 | FLAG_DO = (1 << RES_DO ),
|
---|
| 3094 | FLAG_DONE = (1 << RES_DONE ),
|
---|
| 3095 | FLAG_IN = (1 << RES_IN ),
|
---|
| 3096 | # endif
|
---|
| 3097 | # if ENABLE_HUSH_CASE
|
---|
| 3098 | FLAG_MATCH = (1 << RES_MATCH),
|
---|
| 3099 | FLAG_ESAC = (1 << RES_ESAC ),
|
---|
| 3100 | # endif
|
---|
| 3101 | FLAG_START = (1 << RES_XXXX ),
|
---|
| 3102 | };
|
---|
| 3103 |
|
---|
| 3104 | static const struct reserved_combo* match_reserved_word(o_string *word)
|
---|
| 3105 | {
|
---|
| 3106 | /* Mostly a list of accepted follow-up reserved words.
|
---|
| 3107 | * FLAG_END means we are done with the sequence, and are ready
|
---|
| 3108 | * to turn the compound list into a command.
|
---|
| 3109 | * FLAG_START means the word must start a new compound list.
|
---|
| 3110 | */
|
---|
| 3111 | static const struct reserved_combo reserved_list[] = {
|
---|
| 3112 | # if ENABLE_HUSH_IF
|
---|
[2859] | 3113 | { "!", RES_NONE, NOT_ASSIGNMENT , 0 },
|
---|
| 3114 | { "if", RES_IF, MAYBE_ASSIGNMENT, FLAG_THEN | FLAG_START },
|
---|
| 3115 | { "then", RES_THEN, MAYBE_ASSIGNMENT, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
|
---|
| 3116 | { "elif", RES_ELIF, MAYBE_ASSIGNMENT, FLAG_THEN },
|
---|
| 3117 | { "else", RES_ELSE, MAYBE_ASSIGNMENT, FLAG_FI },
|
---|
| 3118 | { "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END },
|
---|
[2725] | 3119 | # endif
|
---|
| 3120 | # if ENABLE_HUSH_LOOPS
|
---|
[2859] | 3121 | { "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START },
|
---|
| 3122 | { "while", RES_WHILE, MAYBE_ASSIGNMENT, FLAG_DO | FLAG_START },
|
---|
| 3123 | { "until", RES_UNTIL, MAYBE_ASSIGNMENT, FLAG_DO | FLAG_START },
|
---|
| 3124 | { "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO },
|
---|
| 3125 | { "do", RES_DO, MAYBE_ASSIGNMENT, FLAG_DONE },
|
---|
| 3126 | { "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END },
|
---|
[2725] | 3127 | # endif
|
---|
| 3128 | # if ENABLE_HUSH_CASE
|
---|
[2859] | 3129 | { "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START },
|
---|
| 3130 | { "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END },
|
---|
[2725] | 3131 | # endif
|
---|
| 3132 | };
|
---|
| 3133 | const struct reserved_combo *r;
|
---|
| 3134 |
|
---|
| 3135 | for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
|
---|
| 3136 | if (strcmp(word->data, r->literal) == 0)
|
---|
| 3137 | return r;
|
---|
| 3138 | }
|
---|
| 3139 | return NULL;
|
---|
| 3140 | }
|
---|
| 3141 | /* Return 0: not a keyword, 1: keyword
|
---|
| 3142 | */
|
---|
| 3143 | static int reserved_word(o_string *word, struct parse_context *ctx)
|
---|
| 3144 | {
|
---|
| 3145 | # if ENABLE_HUSH_CASE
|
---|
| 3146 | static const struct reserved_combo reserved_match = {
|
---|
| 3147 | "", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC
|
---|
| 3148 | };
|
---|
| 3149 | # endif
|
---|
| 3150 | const struct reserved_combo *r;
|
---|
| 3151 |
|
---|
| 3152 | if (word->has_quoted_part)
|
---|
| 3153 | return 0;
|
---|
| 3154 | r = match_reserved_word(word);
|
---|
| 3155 | if (!r)
|
---|
| 3156 | return 0;
|
---|
| 3157 |
|
---|
| 3158 | debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
|
---|
| 3159 | # if ENABLE_HUSH_CASE
|
---|
| 3160 | if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE_IN) {
|
---|
| 3161 | /* "case word IN ..." - IN part starts first MATCH part */
|
---|
| 3162 | r = &reserved_match;
|
---|
| 3163 | } else
|
---|
| 3164 | # endif
|
---|
| 3165 | if (r->flag == 0) { /* '!' */
|
---|
| 3166 | if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
|
---|
| 3167 | syntax_error("! ! command");
|
---|
| 3168 | ctx->ctx_res_w = RES_SNTX;
|
---|
| 3169 | }
|
---|
| 3170 | ctx->ctx_inverted = 1;
|
---|
| 3171 | return 1;
|
---|
| 3172 | }
|
---|
| 3173 | if (r->flag & FLAG_START) {
|
---|
| 3174 | struct parse_context *old;
|
---|
| 3175 |
|
---|
| 3176 | old = xmalloc(sizeof(*old));
|
---|
| 3177 | debug_printf_parse("push stack %p\n", old);
|
---|
| 3178 | *old = *ctx; /* physical copy */
|
---|
| 3179 | initialize_context(ctx);
|
---|
| 3180 | ctx->stack = old;
|
---|
| 3181 | } else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
|
---|
| 3182 | syntax_error_at(word->data);
|
---|
| 3183 | ctx->ctx_res_w = RES_SNTX;
|
---|
| 3184 | return 1;
|
---|
| 3185 | } else {
|
---|
| 3186 | /* "{...} fi" is ok. "{...} if" is not
|
---|
| 3187 | * Example:
|
---|
| 3188 | * if { echo foo; } then { echo bar; } fi */
|
---|
| 3189 | if (ctx->command->group)
|
---|
| 3190 | done_pipe(ctx, PIPE_SEQ);
|
---|
| 3191 | }
|
---|
| 3192 |
|
---|
| 3193 | ctx->ctx_res_w = r->res;
|
---|
| 3194 | ctx->old_flag = r->flag;
|
---|
| 3195 | word->o_assignment = r->assignment_flag;
|
---|
[2859] | 3196 | debug_printf_parse("word->o_assignment='%s'\n", assignment_flag[word->o_assignment]);
|
---|
[2725] | 3197 |
|
---|
| 3198 | if (ctx->old_flag & FLAG_END) {
|
---|
| 3199 | struct parse_context *old;
|
---|
| 3200 |
|
---|
| 3201 | done_pipe(ctx, PIPE_SEQ);
|
---|
| 3202 | debug_printf_parse("pop stack %p\n", ctx->stack);
|
---|
| 3203 | old = ctx->stack;
|
---|
| 3204 | old->command->group = ctx->list_head;
|
---|
| 3205 | old->command->cmd_type = CMD_NORMAL;
|
---|
| 3206 | # if !BB_MMU
|
---|
[3621] | 3207 | /* At this point, the compound command's string is in
|
---|
| 3208 | * ctx->as_string... except for the leading keyword!
|
---|
| 3209 | * Consider this example: "echo a | if true; then echo a; fi"
|
---|
| 3210 | * ctx->as_string will contain "true; then echo a; fi",
|
---|
| 3211 | * with "if " remaining in old->as_string!
|
---|
| 3212 | */
|
---|
| 3213 | {
|
---|
| 3214 | char *str;
|
---|
| 3215 | int len = old->as_string.length;
|
---|
| 3216 | /* Concatenate halves */
|
---|
| 3217 | o_addstr(&old->as_string, ctx->as_string.data);
|
---|
| 3218 | o_free_unsafe(&ctx->as_string);
|
---|
| 3219 | /* Find where leading keyword starts in first half */
|
---|
| 3220 | str = old->as_string.data + len;
|
---|
| 3221 | if (str > old->as_string.data)
|
---|
| 3222 | str--; /* skip whitespace after keyword */
|
---|
| 3223 | while (str > old->as_string.data && isalpha(str[-1]))
|
---|
| 3224 | str--;
|
---|
| 3225 | /* Ugh, we're done with this horrid hack */
|
---|
| 3226 | old->command->group_as_string = xstrdup(str);
|
---|
| 3227 | debug_printf_parse("pop, remembering as:'%s'\n",
|
---|
| 3228 | old->command->group_as_string);
|
---|
| 3229 | }
|
---|
[2725] | 3230 | # endif
|
---|
| 3231 | *ctx = *old; /* physical copy */
|
---|
| 3232 | free(old);
|
---|
| 3233 | }
|
---|
| 3234 | return 1;
|
---|
| 3235 | }
|
---|
| 3236 | #endif /* HAS_KEYWORDS */
|
---|
| 3237 |
|
---|
| 3238 | /* Word is complete, look at it and update parsing context.
|
---|
| 3239 | * Normal return is 0. Syntax errors return 1.
|
---|
| 3240 | * Note: on return, word is reset, but not o_free'd!
|
---|
| 3241 | */
|
---|
| 3242 | static int done_word(o_string *word, struct parse_context *ctx)
|
---|
| 3243 | {
|
---|
| 3244 | struct command *command = ctx->command;
|
---|
| 3245 |
|
---|
| 3246 | debug_printf_parse("done_word entered: '%s' %p\n", word->data, command);
|
---|
| 3247 | if (word->length == 0 && !word->has_quoted_part) {
|
---|
| 3248 | debug_printf_parse("done_word return 0: true null, ignored\n");
|
---|
| 3249 | return 0;
|
---|
| 3250 | }
|
---|
| 3251 |
|
---|
| 3252 | if (ctx->pending_redirect) {
|
---|
| 3253 | /* We do not glob in e.g. >*.tmp case. bash seems to glob here
|
---|
| 3254 | * only if run as "bash", not "sh" */
|
---|
| 3255 | /* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
|
---|
| 3256 | * "2.7 Redirection
|
---|
| 3257 | * ...the word that follows the redirection operator
|
---|
| 3258 | * shall be subjected to tilde expansion, parameter expansion,
|
---|
| 3259 | * command substitution, arithmetic expansion, and quote
|
---|
| 3260 | * removal. Pathname expansion shall not be performed
|
---|
| 3261 | * on the word by a non-interactive shell; an interactive
|
---|
| 3262 | * shell may perform it, but shall do so only when
|
---|
| 3263 | * the expansion would result in one word."
|
---|
| 3264 | */
|
---|
| 3265 | ctx->pending_redirect->rd_filename = xstrdup(word->data);
|
---|
| 3266 | /* Cater for >\file case:
|
---|
| 3267 | * >\a creates file a; >\\a, >"\a", >"\\a" create file \a
|
---|
| 3268 | * Same with heredocs:
|
---|
| 3269 | * for <<\H delim is H; <<\\H, <<"\H", <<"\\H" - \H
|
---|
| 3270 | */
|
---|
| 3271 | if (ctx->pending_redirect->rd_type == REDIRECT_HEREDOC) {
|
---|
| 3272 | unbackslash(ctx->pending_redirect->rd_filename);
|
---|
| 3273 | /* Is it <<"HEREDOC"? */
|
---|
| 3274 | if (word->has_quoted_part) {
|
---|
| 3275 | ctx->pending_redirect->rd_dup |= HEREDOC_QUOTED;
|
---|
| 3276 | }
|
---|
| 3277 | }
|
---|
| 3278 | debug_printf_parse("word stored in rd_filename: '%s'\n", word->data);
|
---|
| 3279 | ctx->pending_redirect = NULL;
|
---|
| 3280 | } else {
|
---|
| 3281 | #if HAS_KEYWORDS
|
---|
| 3282 | # if ENABLE_HUSH_CASE
|
---|
| 3283 | if (ctx->ctx_dsemicolon
|
---|
| 3284 | && strcmp(word->data, "esac") != 0 /* not "... pattern) cmd;; esac" */
|
---|
| 3285 | ) {
|
---|
| 3286 | /* already done when ctx_dsemicolon was set to 1: */
|
---|
| 3287 | /* ctx->ctx_res_w = RES_MATCH; */
|
---|
| 3288 | ctx->ctx_dsemicolon = 0;
|
---|
| 3289 | } else
|
---|
| 3290 | # endif
|
---|
| 3291 | if (!command->argv /* if it's the first word... */
|
---|
| 3292 | # if ENABLE_HUSH_LOOPS
|
---|
| 3293 | && ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
|
---|
| 3294 | && ctx->ctx_res_w != RES_IN
|
---|
| 3295 | # endif
|
---|
| 3296 | # if ENABLE_HUSH_CASE
|
---|
| 3297 | && ctx->ctx_res_w != RES_CASE
|
---|
| 3298 | # endif
|
---|
| 3299 | ) {
|
---|
[2859] | 3300 | int reserved = reserved_word(word, ctx);
|
---|
| 3301 | debug_printf_parse("checking for reserved-ness: %d\n", reserved);
|
---|
| 3302 | if (reserved) {
|
---|
[2725] | 3303 | o_reset_to_empty_unquoted(word);
|
---|
| 3304 | debug_printf_parse("done_word return %d\n",
|
---|
| 3305 | (ctx->ctx_res_w == RES_SNTX));
|
---|
| 3306 | return (ctx->ctx_res_w == RES_SNTX);
|
---|
| 3307 | }
|
---|
| 3308 | # if ENABLE_HUSH_BASH_COMPAT
|
---|
| 3309 | if (strcmp(word->data, "[[") == 0) {
|
---|
| 3310 | command->cmd_type = CMD_SINGLEWORD_NOGLOB;
|
---|
| 3311 | }
|
---|
| 3312 | /* fall through */
|
---|
| 3313 | # endif
|
---|
| 3314 | }
|
---|
| 3315 | #endif
|
---|
| 3316 | if (command->group) {
|
---|
| 3317 | /* "{ echo foo; } echo bar" - bad */
|
---|
| 3318 | syntax_error_at(word->data);
|
---|
| 3319 | debug_printf_parse("done_word return 1: syntax error, "
|
---|
| 3320 | "groups and arglists don't mix\n");
|
---|
[1765] | 3321 | return 1;
|
---|
[821] | 3322 | }
|
---|
[2859] | 3323 |
|
---|
| 3324 | /* If this word wasn't an assignment, next ones definitely
|
---|
| 3325 | * can't be assignments. Even if they look like ones. */
|
---|
| 3326 | if (word->o_assignment != DEFINITELY_ASSIGNMENT
|
---|
| 3327 | && word->o_assignment != WORD_IS_KEYWORD
|
---|
| 3328 | ) {
|
---|
| 3329 | word->o_assignment = NOT_ASSIGNMENT;
|
---|
| 3330 | } else {
|
---|
| 3331 | if (word->o_assignment == DEFINITELY_ASSIGNMENT) {
|
---|
| 3332 | command->assignment_cnt++;
|
---|
| 3333 | debug_printf_parse("++assignment_cnt=%d\n", command->assignment_cnt);
|
---|
| 3334 | }
|
---|
| 3335 | debug_printf_parse("word->o_assignment was:'%s'\n", assignment_flag[word->o_assignment]);
|
---|
| 3336 | word->o_assignment = MAYBE_ASSIGNMENT;
|
---|
| 3337 | }
|
---|
| 3338 | debug_printf_parse("word->o_assignment='%s'\n", assignment_flag[word->o_assignment]);
|
---|
| 3339 |
|
---|
[2725] | 3340 | if (word->has_quoted_part
|
---|
| 3341 | /* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
|
---|
| 3342 | && (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
|
---|
| 3343 | /* (otherwise it's known to be not empty and is already safe) */
|
---|
[1765] | 3344 | ) {
|
---|
[2725] | 3345 | /* exclude "$@" - it can expand to no word despite "" */
|
---|
| 3346 | char *p = word->data;
|
---|
| 3347 | while (p[0] == SPECIAL_VAR_SYMBOL
|
---|
| 3348 | && (p[1] & 0x7f) == '@'
|
---|
| 3349 | && p[2] == SPECIAL_VAR_SYMBOL
|
---|
| 3350 | ) {
|
---|
| 3351 | p += 3;
|
---|
| 3352 | }
|
---|
| 3353 | }
|
---|
| 3354 | command->argv = add_string_to_strings(command->argv, xstrdup(word->data));
|
---|
| 3355 | debug_print_strings("word appended to argv", command->argv);
|
---|
| 3356 | }
|
---|
| 3357 |
|
---|
| 3358 | #if ENABLE_HUSH_LOOPS
|
---|
| 3359 | if (ctx->ctx_res_w == RES_FOR) {
|
---|
| 3360 | if (word->has_quoted_part
|
---|
| 3361 | || !is_well_formed_var_name(command->argv[0], '\0')
|
---|
| 3362 | ) {
|
---|
| 3363 | /* bash says just "not a valid identifier" */
|
---|
| 3364 | syntax_error("not a valid identifier in for");
|
---|
[1765] | 3365 | return 1;
|
---|
[821] | 3366 | }
|
---|
[2725] | 3367 | /* Force FOR to have just one word (variable name) */
|
---|
| 3368 | /* NB: basically, this makes hush see "for v in ..."
|
---|
| 3369 | * syntax as if it is "for v; in ...". FOR and IN become
|
---|
| 3370 | * two pipe structs in parse tree. */
|
---|
| 3371 | done_pipe(ctx, PIPE_SEQ);
|
---|
[821] | 3372 | }
|
---|
[1765] | 3373 | #endif
|
---|
[2725] | 3374 | #if ENABLE_HUSH_CASE
|
---|
| 3375 | /* Force CASE to have just one word */
|
---|
| 3376 | if (ctx->ctx_res_w == RES_CASE) {
|
---|
| 3377 | done_pipe(ctx, PIPE_SEQ);
|
---|
| 3378 | }
|
---|
| 3379 | #endif
|
---|
[1765] | 3380 |
|
---|
[2725] | 3381 | o_reset_to_empty_unquoted(word);
|
---|
| 3382 |
|
---|
| 3383 | debug_printf_parse("done_word return 0\n");
|
---|
| 3384 | return 0;
|
---|
| 3385 | }
|
---|
| 3386 |
|
---|
| 3387 |
|
---|
| 3388 | /* Peek ahead in the input to find out if we have a "&n" construct,
|
---|
| 3389 | * as in "2>&1", that represents duplicating a file descriptor.
|
---|
| 3390 | * Return:
|
---|
| 3391 | * REDIRFD_CLOSE if >&- "close fd" construct is seen,
|
---|
| 3392 | * REDIRFD_SYNTAX_ERR if syntax error,
|
---|
| 3393 | * REDIRFD_TO_FILE if no & was seen,
|
---|
| 3394 | * or the number found.
|
---|
| 3395 | */
|
---|
| 3396 | #if BB_MMU
|
---|
| 3397 | #define parse_redir_right_fd(as_string, input) \
|
---|
| 3398 | parse_redir_right_fd(input)
|
---|
[1765] | 3399 | #endif
|
---|
[2725] | 3400 | static int parse_redir_right_fd(o_string *as_string, struct in_str *input)
|
---|
| 3401 | {
|
---|
| 3402 | int ch, d, ok;
|
---|
| 3403 |
|
---|
| 3404 | ch = i_peek(input);
|
---|
| 3405 | if (ch != '&')
|
---|
| 3406 | return REDIRFD_TO_FILE;
|
---|
| 3407 |
|
---|
| 3408 | ch = i_getch(input); /* get the & */
|
---|
| 3409 | nommu_addchr(as_string, ch);
|
---|
| 3410 | ch = i_peek(input);
|
---|
| 3411 | if (ch == '-') {
|
---|
| 3412 | ch = i_getch(input);
|
---|
| 3413 | nommu_addchr(as_string, ch);
|
---|
| 3414 | return REDIRFD_CLOSE;
|
---|
| 3415 | }
|
---|
| 3416 | d = 0;
|
---|
| 3417 | ok = 0;
|
---|
| 3418 | while (ch != EOF && isdigit(ch)) {
|
---|
| 3419 | d = d*10 + (ch-'0');
|
---|
| 3420 | ok = 1;
|
---|
| 3421 | ch = i_getch(input);
|
---|
| 3422 | nommu_addchr(as_string, ch);
|
---|
| 3423 | ch = i_peek(input);
|
---|
| 3424 | }
|
---|
| 3425 | if (ok) return d;
|
---|
| 3426 |
|
---|
| 3427 | //TODO: this is the place to catch ">&file" bashism (redirect both fd 1 and 2)
|
---|
| 3428 |
|
---|
| 3429 | bb_error_msg("ambiguous redirect");
|
---|
| 3430 | return REDIRFD_SYNTAX_ERR;
|
---|
| 3431 | }
|
---|
| 3432 |
|
---|
| 3433 | /* Return code is 0 normal, 1 if a syntax error is detected
|
---|
| 3434 | */
|
---|
| 3435 | static int parse_redirect(struct parse_context *ctx,
|
---|
| 3436 | int fd,
|
---|
| 3437 | redir_type style,
|
---|
| 3438 | struct in_str *input)
|
---|
| 3439 | {
|
---|
| 3440 | struct command *command = ctx->command;
|
---|
| 3441 | struct redir_struct *redir;
|
---|
| 3442 | struct redir_struct **redirp;
|
---|
| 3443 | int dup_num;
|
---|
| 3444 |
|
---|
| 3445 | dup_num = REDIRFD_TO_FILE;
|
---|
| 3446 | if (style != REDIRECT_HEREDOC) {
|
---|
| 3447 | /* Check for a '>&1' type redirect */
|
---|
| 3448 | dup_num = parse_redir_right_fd(&ctx->as_string, input);
|
---|
| 3449 | if (dup_num == REDIRFD_SYNTAX_ERR)
|
---|
| 3450 | return 1;
|
---|
| 3451 | } else {
|
---|
| 3452 | int ch = i_peek(input);
|
---|
| 3453 | dup_num = (ch == '-'); /* HEREDOC_SKIPTABS bit is 1 */
|
---|
| 3454 | if (dup_num) { /* <<-... */
|
---|
| 3455 | ch = i_getch(input);
|
---|
| 3456 | nommu_addchr(&ctx->as_string, ch);
|
---|
| 3457 | ch = i_peek(input);
|
---|
| 3458 | }
|
---|
| 3459 | }
|
---|
| 3460 |
|
---|
| 3461 | if (style == REDIRECT_OVERWRITE && dup_num == REDIRFD_TO_FILE) {
|
---|
| 3462 | int ch = i_peek(input);
|
---|
| 3463 | if (ch == '|') {
|
---|
| 3464 | /* >|FILE redirect ("clobbering" >).
|
---|
| 3465 | * Since we do not support "set -o noclobber" yet,
|
---|
| 3466 | * >| and > are the same for now. Just eat |.
|
---|
| 3467 | */
|
---|
| 3468 | ch = i_getch(input);
|
---|
| 3469 | nommu_addchr(&ctx->as_string, ch);
|
---|
| 3470 | }
|
---|
| 3471 | }
|
---|
| 3472 |
|
---|
| 3473 | /* Create a new redir_struct and append it to the linked list */
|
---|
| 3474 | redirp = &command->redirects;
|
---|
| 3475 | while ((redir = *redirp) != NULL) {
|
---|
| 3476 | redirp = &(redir->next);
|
---|
| 3477 | }
|
---|
| 3478 | *redirp = redir = xzalloc(sizeof(*redir));
|
---|
| 3479 | /* redir->next = NULL; */
|
---|
| 3480 | /* redir->rd_filename = NULL; */
|
---|
| 3481 | redir->rd_type = style;
|
---|
| 3482 | redir->rd_fd = (fd == -1) ? redir_table[style].default_fd : fd;
|
---|
| 3483 |
|
---|
| 3484 | debug_printf_parse("redirect type %d %s\n", redir->rd_fd,
|
---|
| 3485 | redir_table[style].descrip);
|
---|
| 3486 |
|
---|
| 3487 | redir->rd_dup = dup_num;
|
---|
| 3488 | if (style != REDIRECT_HEREDOC && dup_num != REDIRFD_TO_FILE) {
|
---|
| 3489 | /* Erik had a check here that the file descriptor in question
|
---|
| 3490 | * is legit; I postpone that to "run time"
|
---|
| 3491 | * A "-" representation of "close me" shows up as a -3 here */
|
---|
| 3492 | debug_printf_parse("duplicating redirect '%d>&%d'\n",
|
---|
| 3493 | redir->rd_fd, redir->rd_dup);
|
---|
| 3494 | } else {
|
---|
| 3495 | /* Set ctx->pending_redirect, so we know what to do at the
|
---|
| 3496 | * end of the next parsed word. */
|
---|
| 3497 | ctx->pending_redirect = redir;
|
---|
| 3498 | }
|
---|
| 3499 | return 0;
|
---|
| 3500 | }
|
---|
| 3501 |
|
---|
| 3502 | /* If a redirect is immediately preceded by a number, that number is
|
---|
| 3503 | * supposed to tell which file descriptor to redirect. This routine
|
---|
| 3504 | * looks for such preceding numbers. In an ideal world this routine
|
---|
| 3505 | * needs to handle all the following classes of redirects...
|
---|
| 3506 | * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
|
---|
| 3507 | * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
|
---|
| 3508 | * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
|
---|
| 3509 | * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
|
---|
| 3510 | *
|
---|
| 3511 | * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
|
---|
| 3512 | * "2.7 Redirection
|
---|
| 3513 | * ... If n is quoted, the number shall not be recognized as part of
|
---|
| 3514 | * the redirection expression. For example:
|
---|
| 3515 | * echo \2>a
|
---|
| 3516 | * writes the character 2 into file a"
|
---|
| 3517 | * We are getting it right by setting ->has_quoted_part on any \<char>
|
---|
| 3518 | *
|
---|
| 3519 | * A -1 return means no valid number was found,
|
---|
| 3520 | * the caller should use the appropriate default for this redirection.
|
---|
| 3521 | */
|
---|
| 3522 | static int redirect_opt_num(o_string *o)
|
---|
| 3523 | {
|
---|
| 3524 | int num;
|
---|
| 3525 |
|
---|
| 3526 | if (o->data == NULL)
|
---|
| 3527 | return -1;
|
---|
| 3528 | num = bb_strtou(o->data, NULL, 10);
|
---|
| 3529 | if (errno || num < 0)
|
---|
| 3530 | return -1;
|
---|
| 3531 | o_reset_to_empty_unquoted(o);
|
---|
| 3532 | return num;
|
---|
| 3533 | }
|
---|
| 3534 |
|
---|
| 3535 | #if BB_MMU
|
---|
| 3536 | #define fetch_till_str(as_string, input, word, skip_tabs) \
|
---|
| 3537 | fetch_till_str(input, word, skip_tabs)
|
---|
| 3538 | #endif
|
---|
| 3539 | static char *fetch_till_str(o_string *as_string,
|
---|
| 3540 | struct in_str *input,
|
---|
| 3541 | const char *word,
|
---|
| 3542 | int heredoc_flags)
|
---|
| 3543 | {
|
---|
| 3544 | o_string heredoc = NULL_O_STRING;
|
---|
| 3545 | unsigned past_EOL;
|
---|
| 3546 | int prev = 0; /* not \ */
|
---|
| 3547 | int ch;
|
---|
| 3548 |
|
---|
| 3549 | goto jump_in;
|
---|
[3232] | 3550 |
|
---|
[2725] | 3551 | while (1) {
|
---|
| 3552 | ch = i_getch(input);
|
---|
| 3553 | if (ch != EOF)
|
---|
| 3554 | nommu_addchr(as_string, ch);
|
---|
| 3555 | if ((ch == '\n' || ch == EOF)
|
---|
| 3556 | && ((heredoc_flags & HEREDOC_QUOTED) || prev != '\\')
|
---|
| 3557 | ) {
|
---|
| 3558 | if (strcmp(heredoc.data + past_EOL, word) == 0) {
|
---|
| 3559 | heredoc.data[past_EOL] = '\0';
|
---|
| 3560 | debug_printf_parse("parsed heredoc '%s'\n", heredoc.data);
|
---|
| 3561 | return heredoc.data;
|
---|
[1765] | 3562 | }
|
---|
[2725] | 3563 | while (ch == '\n') {
|
---|
| 3564 | o_addchr(&heredoc, ch);
|
---|
| 3565 | prev = ch;
|
---|
| 3566 | jump_in:
|
---|
| 3567 | past_EOL = heredoc.length;
|
---|
| 3568 | do {
|
---|
| 3569 | ch = i_getch(input);
|
---|
| 3570 | if (ch != EOF)
|
---|
| 3571 | nommu_addchr(as_string, ch);
|
---|
| 3572 | } while ((heredoc_flags & HEREDOC_SKIPTABS) && ch == '\t');
|
---|
| 3573 | }
|
---|
[821] | 3574 | }
|
---|
[2725] | 3575 | if (ch == EOF) {
|
---|
| 3576 | o_free_unsafe(&heredoc);
|
---|
| 3577 | return NULL;
|
---|
| 3578 | }
|
---|
| 3579 | o_addchr(&heredoc, ch);
|
---|
| 3580 | nommu_addchr(as_string, ch);
|
---|
| 3581 | if (prev == '\\' && ch == '\\')
|
---|
| 3582 | /* Correctly handle foo\\<eol> (not a line cont.) */
|
---|
| 3583 | prev = 0; /* not \ */
|
---|
| 3584 | else
|
---|
| 3585 | prev = ch;
|
---|
| 3586 | }
|
---|
| 3587 | }
|
---|
| 3588 |
|
---|
| 3589 | /* Look at entire parse tree for not-yet-loaded REDIRECT_HEREDOCs
|
---|
| 3590 | * and load them all. There should be exactly heredoc_cnt of them.
|
---|
| 3591 | */
|
---|
| 3592 | static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_str *input)
|
---|
| 3593 | {
|
---|
| 3594 | struct pipe *pi = ctx->list_head;
|
---|
| 3595 |
|
---|
| 3596 | while (pi && heredoc_cnt) {
|
---|
| 3597 | int i;
|
---|
| 3598 | struct command *cmd = pi->cmds;
|
---|
| 3599 |
|
---|
| 3600 | debug_printf_parse("fetch_heredocs: num_cmds:%d cmd argv0:'%s'\n",
|
---|
| 3601 | pi->num_cmds,
|
---|
| 3602 | cmd->argv ? cmd->argv[0] : "NONE");
|
---|
| 3603 | for (i = 0; i < pi->num_cmds; i++) {
|
---|
| 3604 | struct redir_struct *redir = cmd->redirects;
|
---|
| 3605 |
|
---|
| 3606 | debug_printf_parse("fetch_heredocs: %d cmd argv0:'%s'\n",
|
---|
| 3607 | i, cmd->argv ? cmd->argv[0] : "NONE");
|
---|
| 3608 | while (redir) {
|
---|
| 3609 | if (redir->rd_type == REDIRECT_HEREDOC) {
|
---|
| 3610 | char *p;
|
---|
| 3611 |
|
---|
| 3612 | redir->rd_type = REDIRECT_HEREDOC2;
|
---|
| 3613 | /* redir->rd_dup is (ab)used to indicate <<- */
|
---|
| 3614 | p = fetch_till_str(&ctx->as_string, input,
|
---|
| 3615 | redir->rd_filename, redir->rd_dup);
|
---|
| 3616 | if (!p) {
|
---|
| 3617 | syntax_error("unexpected EOF in here document");
|
---|
| 3618 | return 1;
|
---|
| 3619 | }
|
---|
| 3620 | free(redir->rd_filename);
|
---|
| 3621 | redir->rd_filename = p;
|
---|
| 3622 | heredoc_cnt--;
|
---|
| 3623 | }
|
---|
| 3624 | redir = redir->next;
|
---|
| 3625 | }
|
---|
| 3626 | cmd++;
|
---|
| 3627 | }
|
---|
| 3628 | pi = pi->next;
|
---|
| 3629 | }
|
---|
| 3630 | #if 0
|
---|
| 3631 | /* Should be 0. If it isn't, it's a parse error */
|
---|
| 3632 | if (heredoc_cnt)
|
---|
| 3633 | bb_error_msg_and_die("heredoc BUG 2");
|
---|
[1765] | 3634 | #endif
|
---|
[2725] | 3635 | return 0;
|
---|
| 3636 | }
|
---|
| 3637 |
|
---|
| 3638 |
|
---|
| 3639 | static int run_list(struct pipe *pi);
|
---|
| 3640 | #if BB_MMU
|
---|
| 3641 | #define parse_stream(pstring, input, end_trigger) \
|
---|
| 3642 | parse_stream(input, end_trigger)
|
---|
| 3643 | #endif
|
---|
| 3644 | static struct pipe *parse_stream(char **pstring,
|
---|
| 3645 | struct in_str *input,
|
---|
| 3646 | int end_trigger);
|
---|
| 3647 |
|
---|
| 3648 |
|
---|
| 3649 | #if !ENABLE_HUSH_FUNCTIONS
|
---|
| 3650 | #define parse_group(dest, ctx, input, ch) \
|
---|
| 3651 | parse_group(ctx, input, ch)
|
---|
| 3652 | #endif
|
---|
| 3653 | static int parse_group(o_string *dest, struct parse_context *ctx,
|
---|
| 3654 | struct in_str *input, int ch)
|
---|
| 3655 | {
|
---|
| 3656 | /* dest contains characters seen prior to ( or {.
|
---|
| 3657 | * Typically it's empty, but for function defs,
|
---|
| 3658 | * it contains function name (without '()'). */
|
---|
| 3659 | struct pipe *pipe_list;
|
---|
| 3660 | int endch;
|
---|
| 3661 | struct command *command = ctx->command;
|
---|
| 3662 |
|
---|
| 3663 | debug_printf_parse("parse_group entered\n");
|
---|
| 3664 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 3665 | if (ch == '(' && !dest->has_quoted_part) {
|
---|
| 3666 | if (dest->length)
|
---|
| 3667 | if (done_word(dest, ctx))
|
---|
| 3668 | return 1;
|
---|
| 3669 | if (!command->argv)
|
---|
| 3670 | goto skip; /* (... */
|
---|
| 3671 | if (command->argv[1]) { /* word word ... (... */
|
---|
| 3672 | syntax_error_unexpected_ch('(');
|
---|
| 3673 | return 1;
|
---|
| 3674 | }
|
---|
| 3675 | /* it is "word(..." or "word (..." */
|
---|
| 3676 | do
|
---|
| 3677 | ch = i_getch(input);
|
---|
| 3678 | while (ch == ' ' || ch == '\t');
|
---|
| 3679 | if (ch != ')') {
|
---|
| 3680 | syntax_error_unexpected_ch(ch);
|
---|
| 3681 | return 1;
|
---|
| 3682 | }
|
---|
| 3683 | nommu_addchr(&ctx->as_string, ch);
|
---|
| 3684 | do
|
---|
| 3685 | ch = i_getch(input);
|
---|
| 3686 | while (ch == ' ' || ch == '\t' || ch == '\n');
|
---|
| 3687 | if (ch != '{') {
|
---|
| 3688 | syntax_error_unexpected_ch(ch);
|
---|
| 3689 | return 1;
|
---|
| 3690 | }
|
---|
| 3691 | nommu_addchr(&ctx->as_string, ch);
|
---|
| 3692 | command->cmd_type = CMD_FUNCDEF;
|
---|
| 3693 | goto skip;
|
---|
[1765] | 3694 | }
|
---|
| 3695 | #endif
|
---|
| 3696 |
|
---|
[2725] | 3697 | #if 0 /* Prevented by caller */
|
---|
| 3698 | if (command->argv /* word [word]{... */
|
---|
| 3699 | || dest->length /* word{... */
|
---|
| 3700 | || dest->has_quoted_part /* ""{... */
|
---|
| 3701 | ) {
|
---|
| 3702 | syntax_error(NULL);
|
---|
| 3703 | debug_printf_parse("parse_group return 1: "
|
---|
| 3704 | "syntax error, groups and arglists don't mix\n");
|
---|
| 3705 | return 1;
|
---|
| 3706 | }
|
---|
| 3707 | #endif
|
---|
| 3708 |
|
---|
| 3709 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 3710 | skip:
|
---|
| 3711 | #endif
|
---|
| 3712 | endch = '}';
|
---|
| 3713 | if (ch == '(') {
|
---|
| 3714 | endch = ')';
|
---|
| 3715 | command->cmd_type = CMD_SUBSHELL;
|
---|
| 3716 | } else {
|
---|
| 3717 | /* bash does not allow "{echo...", requires whitespace */
|
---|
| 3718 | ch = i_getch(input);
|
---|
| 3719 | if (ch != ' ' && ch != '\t' && ch != '\n') {
|
---|
| 3720 | syntax_error_unexpected_ch(ch);
|
---|
| 3721 | return 1;
|
---|
[1765] | 3722 | }
|
---|
[2725] | 3723 | nommu_addchr(&ctx->as_string, ch);
|
---|
| 3724 | }
|
---|
| 3725 |
|
---|
| 3726 | {
|
---|
| 3727 | #if BB_MMU
|
---|
| 3728 | # define as_string NULL
|
---|
| 3729 | #else
|
---|
| 3730 | char *as_string = NULL;
|
---|
[1765] | 3731 | #endif
|
---|
[2725] | 3732 | pipe_list = parse_stream(&as_string, input, endch);
|
---|
| 3733 | #if !BB_MMU
|
---|
| 3734 | if (as_string)
|
---|
| 3735 | o_addstr(&ctx->as_string, as_string);
|
---|
| 3736 | #endif
|
---|
| 3737 | /* empty ()/{} or parse error? */
|
---|
| 3738 | if (!pipe_list || pipe_list == ERR_PTR) {
|
---|
| 3739 | /* parse_stream already emitted error msg */
|
---|
| 3740 | if (!BB_MMU)
|
---|
| 3741 | free(as_string);
|
---|
| 3742 | debug_printf_parse("parse_group return 1: "
|
---|
| 3743 | "parse_stream returned %p\n", pipe_list);
|
---|
| 3744 | return 1;
|
---|
| 3745 | }
|
---|
| 3746 | command->group = pipe_list;
|
---|
| 3747 | #if !BB_MMU
|
---|
| 3748 | as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
|
---|
| 3749 | command->group_as_string = as_string;
|
---|
| 3750 | debug_printf_parse("end of group, remembering as:'%s'\n",
|
---|
| 3751 | command->group_as_string);
|
---|
| 3752 | #endif
|
---|
| 3753 | #undef as_string
|
---|
| 3754 | }
|
---|
| 3755 | debug_printf_parse("parse_group return 0\n");
|
---|
| 3756 | return 0;
|
---|
| 3757 | /* command remains "open", available for possible redirects */
|
---|
| 3758 | }
|
---|
| 3759 |
|
---|
| 3760 | #if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS
|
---|
| 3761 | /* Subroutines for copying $(...) and `...` things */
|
---|
[3232] | 3762 | static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote);
|
---|
[2725] | 3763 | /* '...' */
|
---|
[3232] | 3764 | static int add_till_single_quote(o_string *dest, struct in_str *input)
|
---|
[2725] | 3765 | {
|
---|
| 3766 | while (1) {
|
---|
| 3767 | int ch = i_getch(input);
|
---|
| 3768 | if (ch == EOF) {
|
---|
| 3769 | syntax_error_unterm_ch('\'');
|
---|
[3232] | 3770 | return 0;
|
---|
[2725] | 3771 | }
|
---|
| 3772 | if (ch == '\'')
|
---|
[3232] | 3773 | return 1;
|
---|
[2725] | 3774 | o_addchr(dest, ch);
|
---|
| 3775 | }
|
---|
| 3776 | }
|
---|
| 3777 | /* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
|
---|
[3232] | 3778 | static int add_till_double_quote(o_string *dest, struct in_str *input)
|
---|
[2725] | 3779 | {
|
---|
| 3780 | while (1) {
|
---|
| 3781 | int ch = i_getch(input);
|
---|
| 3782 | if (ch == EOF) {
|
---|
| 3783 | syntax_error_unterm_ch('"');
|
---|
[3232] | 3784 | return 0;
|
---|
[2725] | 3785 | }
|
---|
| 3786 | if (ch == '"')
|
---|
[3232] | 3787 | return 1;
|
---|
[2725] | 3788 | if (ch == '\\') { /* \x. Copy both chars. */
|
---|
| 3789 | o_addchr(dest, ch);
|
---|
| 3790 | ch = i_getch(input);
|
---|
| 3791 | }
|
---|
| 3792 | o_addchr(dest, ch);
|
---|
| 3793 | if (ch == '`') {
|
---|
[3232] | 3794 | if (!add_till_backquote(dest, input, /*in_dquote:*/ 1))
|
---|
| 3795 | return 0;
|
---|
[2725] | 3796 | o_addchr(dest, ch);
|
---|
[821] | 3797 | continue;
|
---|
| 3798 | }
|
---|
[2725] | 3799 | //if (ch == '$') ...
|
---|
| 3800 | }
|
---|
| 3801 | }
|
---|
| 3802 | /* Process `cmd` - copy contents until "`" is seen. Complicated by
|
---|
| 3803 | * \` quoting.
|
---|
| 3804 | * "Within the backquoted style of command substitution, backslash
|
---|
| 3805 | * shall retain its literal meaning, except when followed by: '$', '`', or '\'.
|
---|
| 3806 | * The search for the matching backquote shall be satisfied by the first
|
---|
| 3807 | * backquote found without a preceding backslash; during this search,
|
---|
| 3808 | * if a non-escaped backquote is encountered within a shell comment,
|
---|
| 3809 | * a here-document, an embedded command substitution of the $(command)
|
---|
| 3810 | * form, or a quoted string, undefined results occur. A single-quoted
|
---|
| 3811 | * or double-quoted string that begins, but does not end, within the
|
---|
| 3812 | * "`...`" sequence produces undefined results."
|
---|
| 3813 | * Example Output
|
---|
| 3814 | * echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
|
---|
| 3815 | */
|
---|
[3232] | 3816 | static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote)
|
---|
[2725] | 3817 | {
|
---|
| 3818 | while (1) {
|
---|
| 3819 | int ch = i_getch(input);
|
---|
| 3820 | if (ch == '`')
|
---|
[3232] | 3821 | return 1;
|
---|
[2725] | 3822 | if (ch == '\\') {
|
---|
| 3823 | /* \x. Copy both unless it is \`, \$, \\ and maybe \" */
|
---|
| 3824 | ch = i_getch(input);
|
---|
| 3825 | if (ch != '`'
|
---|
| 3826 | && ch != '$'
|
---|
| 3827 | && ch != '\\'
|
---|
| 3828 | && (!in_dquote || ch != '"')
|
---|
| 3829 | ) {
|
---|
| 3830 | o_addchr(dest, '\\');
|
---|
[821] | 3831 | }
|
---|
[2725] | 3832 | }
|
---|
| 3833 | if (ch == EOF) {
|
---|
| 3834 | syntax_error_unterm_ch('`');
|
---|
[3232] | 3835 | return 0;
|
---|
[2725] | 3836 | }
|
---|
| 3837 | o_addchr(dest, ch);
|
---|
| 3838 | }
|
---|
| 3839 | }
|
---|
| 3840 | /* Process $(cmd) - copy contents until ")" is seen. Complicated by
|
---|
| 3841 | * quoting and nested ()s.
|
---|
| 3842 | * "With the $(command) style of command substitution, all characters
|
---|
| 3843 | * following the open parenthesis to the matching closing parenthesis
|
---|
| 3844 | * constitute the command. Any valid shell script can be used for command,
|
---|
| 3845 | * except a script consisting solely of redirections which produces
|
---|
| 3846 | * unspecified results."
|
---|
| 3847 | * Example Output
|
---|
| 3848 | * echo $(echo '(TEST)' BEST) (TEST) BEST
|
---|
| 3849 | * echo $(echo 'TEST)' BEST) TEST) BEST
|
---|
| 3850 | * echo $(echo \(\(TEST\) BEST) ((TEST) BEST
|
---|
| 3851 | *
|
---|
| 3852 | * Also adapted to eat ${var%...} and $((...)) constructs, since ... part
|
---|
| 3853 | * can contain arbitrary constructs, just like $(cmd).
|
---|
| 3854 | * In bash compat mode, it needs to also be able to stop on ':' or '/'
|
---|
| 3855 | * for ${var:N[:M]} and ${var/P[/R]} parsing.
|
---|
| 3856 | */
|
---|
| 3857 | #define DOUBLE_CLOSE_CHAR_FLAG 0x80
|
---|
| 3858 | static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsigned end_ch)
|
---|
| 3859 | {
|
---|
| 3860 | int ch;
|
---|
| 3861 | char dbl = end_ch & DOUBLE_CLOSE_CHAR_FLAG;
|
---|
| 3862 | # if ENABLE_HUSH_BASH_COMPAT
|
---|
| 3863 | char end_char2 = end_ch >> 8;
|
---|
| 3864 | # endif
|
---|
| 3865 | end_ch &= (DOUBLE_CLOSE_CHAR_FLAG - 1);
|
---|
| 3866 |
|
---|
| 3867 | while (1) {
|
---|
| 3868 | ch = i_getch(input);
|
---|
| 3869 | if (ch == EOF) {
|
---|
| 3870 | syntax_error_unterm_ch(end_ch);
|
---|
[3232] | 3871 | return 0;
|
---|
[2725] | 3872 | }
|
---|
| 3873 | if (ch == end_ch IF_HUSH_BASH_COMPAT( || ch == end_char2)) {
|
---|
| 3874 | if (!dbl)
|
---|
| 3875 | break;
|
---|
| 3876 | /* we look for closing )) of $((EXPR)) */
|
---|
| 3877 | if (i_peek(input) == end_ch) {
|
---|
| 3878 | i_getch(input); /* eat second ')' */
|
---|
| 3879 | break;
|
---|
[821] | 3880 | }
|
---|
| 3881 | }
|
---|
[2725] | 3882 | o_addchr(dest, ch);
|
---|
| 3883 | if (ch == '(' || ch == '{') {
|
---|
| 3884 | ch = (ch == '(' ? ')' : '}');
|
---|
[3232] | 3885 | if (!add_till_closing_bracket(dest, input, ch))
|
---|
| 3886 | return 0;
|
---|
[2725] | 3887 | o_addchr(dest, ch);
|
---|
[1765] | 3888 | continue;
|
---|
[821] | 3889 | }
|
---|
[2725] | 3890 | if (ch == '\'') {
|
---|
[3232] | 3891 | if (!add_till_single_quote(dest, input))
|
---|
| 3892 | return 0;
|
---|
[2725] | 3893 | o_addchr(dest, ch);
|
---|
| 3894 | continue;
|
---|
| 3895 | }
|
---|
| 3896 | if (ch == '"') {
|
---|
[3232] | 3897 | if (!add_till_double_quote(dest, input))
|
---|
| 3898 | return 0;
|
---|
[2725] | 3899 | o_addchr(dest, ch);
|
---|
| 3900 | continue;
|
---|
| 3901 | }
|
---|
| 3902 | if (ch == '`') {
|
---|
[3232] | 3903 | if (!add_till_backquote(dest, input, /*in_dquote:*/ 0))
|
---|
| 3904 | return 0;
|
---|
[2725] | 3905 | o_addchr(dest, ch);
|
---|
| 3906 | continue;
|
---|
| 3907 | }
|
---|
| 3908 | if (ch == '\\') {
|
---|
| 3909 | /* \x. Copy verbatim. Important for \(, \) */
|
---|
| 3910 | ch = i_getch(input);
|
---|
| 3911 | if (ch == EOF) {
|
---|
| 3912 | syntax_error_unterm_ch(')');
|
---|
[3232] | 3913 | return 0;
|
---|
[821] | 3914 | }
|
---|
[2725] | 3915 | o_addchr(dest, ch);
|
---|
| 3916 | continue;
|
---|
[821] | 3917 | }
|
---|
[2725] | 3918 | }
|
---|
| 3919 | return ch;
|
---|
| 3920 | }
|
---|
| 3921 | #endif /* ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS */
|
---|
| 3922 |
|
---|
| 3923 | /* Return code: 0 for OK, 1 for syntax error */
|
---|
| 3924 | #if BB_MMU
|
---|
| 3925 | #define parse_dollar(as_string, dest, input, quote_mask) \
|
---|
| 3926 | parse_dollar(dest, input, quote_mask)
|
---|
| 3927 | #define as_string NULL
|
---|
[1765] | 3928 | #endif
|
---|
[2725] | 3929 | static int parse_dollar(o_string *as_string,
|
---|
| 3930 | o_string *dest,
|
---|
| 3931 | struct in_str *input, unsigned char quote_mask)
|
---|
| 3932 | {
|
---|
| 3933 | int ch = i_peek(input); /* first character after the $ */
|
---|
| 3934 |
|
---|
| 3935 | debug_printf_parse("parse_dollar entered: ch='%c'\n", ch);
|
---|
| 3936 | if (isalpha(ch)) {
|
---|
| 3937 | ch = i_getch(input);
|
---|
| 3938 | nommu_addchr(as_string, ch);
|
---|
| 3939 | make_var:
|
---|
| 3940 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 3941 | while (1) {
|
---|
| 3942 | debug_printf_parse(": '%c'\n", ch);
|
---|
| 3943 | o_addchr(dest, ch | quote_mask);
|
---|
| 3944 | quote_mask = 0;
|
---|
| 3945 | ch = i_peek(input);
|
---|
| 3946 | if (!isalnum(ch) && ch != '_')
|
---|
| 3947 | break;
|
---|
| 3948 | ch = i_getch(input);
|
---|
| 3949 | nommu_addchr(as_string, ch);
|
---|
| 3950 | }
|
---|
| 3951 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 3952 | } else if (isdigit(ch)) {
|
---|
| 3953 | make_one_char_var:
|
---|
| 3954 | ch = i_getch(input);
|
---|
| 3955 | nommu_addchr(as_string, ch);
|
---|
| 3956 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 3957 | debug_printf_parse(": '%c'\n", ch);
|
---|
| 3958 | o_addchr(dest, ch | quote_mask);
|
---|
| 3959 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 3960 | } else switch (ch) {
|
---|
| 3961 | case '$': /* pid */
|
---|
| 3962 | case '!': /* last bg pid */
|
---|
| 3963 | case '?': /* last exit code */
|
---|
| 3964 | case '#': /* number of args */
|
---|
| 3965 | case '*': /* args */
|
---|
| 3966 | case '@': /* args */
|
---|
| 3967 | goto make_one_char_var;
|
---|
| 3968 | case '{': {
|
---|
| 3969 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 3970 |
|
---|
| 3971 | ch = i_getch(input); /* eat '{' */
|
---|
| 3972 | nommu_addchr(as_string, ch);
|
---|
| 3973 |
|
---|
| 3974 | ch = i_getch(input); /* first char after '{' */
|
---|
| 3975 | /* It should be ${?}, or ${#var},
|
---|
| 3976 | * or even ${?+subst} - operator acting on a special variable,
|
---|
| 3977 | * or the beginning of variable name.
|
---|
| 3978 | */
|
---|
| 3979 | if (ch == EOF
|
---|
| 3980 | || (!strchr(_SPECIAL_VARS_STR, ch) && !isalnum(ch)) /* not one of those */
|
---|
| 3981 | ) {
|
---|
| 3982 | bad_dollar_syntax:
|
---|
| 3983 | syntax_error_unterm_str("${name}");
|
---|
[3232] | 3984 | debug_printf_parse("parse_dollar return 0: unterminated ${name}\n");
|
---|
| 3985 | return 0;
|
---|
[2725] | 3986 | }
|
---|
| 3987 | nommu_addchr(as_string, ch);
|
---|
| 3988 | ch |= quote_mask;
|
---|
| 3989 |
|
---|
| 3990 | /* It's possible to just call add_till_closing_bracket() at this point.
|
---|
| 3991 | * However, this regresses some of our testsuite cases
|
---|
| 3992 | * which check invalid constructs like ${%}.
|
---|
| 3993 | * Oh well... let's check that the var name part is fine... */
|
---|
| 3994 |
|
---|
| 3995 | while (1) {
|
---|
| 3996 | unsigned pos;
|
---|
| 3997 |
|
---|
| 3998 | o_addchr(dest, ch);
|
---|
| 3999 | debug_printf_parse(": '%c'\n", ch);
|
---|
| 4000 |
|
---|
| 4001 | ch = i_getch(input);
|
---|
| 4002 | nommu_addchr(as_string, ch);
|
---|
| 4003 | if (ch == '}')
|
---|
| 4004 | break;
|
---|
| 4005 |
|
---|
| 4006 | if (!isalnum(ch) && ch != '_') {
|
---|
| 4007 | unsigned end_ch;
|
---|
| 4008 | unsigned char last_ch;
|
---|
| 4009 | /* handle parameter expansions
|
---|
| 4010 | * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
|
---|
| 4011 | */
|
---|
| 4012 | if (!strchr(VAR_SUBST_OPS, ch)) /* ${var<bad_char>... */
|
---|
| 4013 | goto bad_dollar_syntax;
|
---|
| 4014 |
|
---|
| 4015 | /* Eat everything until closing '}' (or ':') */
|
---|
| 4016 | end_ch = '}';
|
---|
| 4017 | if (ENABLE_HUSH_BASH_COMPAT
|
---|
| 4018 | && ch == ':'
|
---|
| 4019 | && !strchr(MINUS_PLUS_EQUAL_QUESTION, i_peek(input))
|
---|
| 4020 | ) {
|
---|
| 4021 | /* It's ${var:N[:M]} thing */
|
---|
| 4022 | end_ch = '}' * 0x100 + ':';
|
---|
| 4023 | }
|
---|
| 4024 | if (ENABLE_HUSH_BASH_COMPAT
|
---|
| 4025 | && ch == '/'
|
---|
| 4026 | ) {
|
---|
| 4027 | /* It's ${var/[/]pattern[/repl]} thing */
|
---|
| 4028 | if (i_peek(input) == '/') { /* ${var//pattern[/repl]}? */
|
---|
| 4029 | i_getch(input);
|
---|
| 4030 | nommu_addchr(as_string, '/');
|
---|
| 4031 | ch = '\\';
|
---|
| 4032 | }
|
---|
| 4033 | end_ch = '}' * 0x100 + '/';
|
---|
| 4034 | }
|
---|
| 4035 | o_addchr(dest, ch);
|
---|
| 4036 | again:
|
---|
| 4037 | if (!BB_MMU)
|
---|
| 4038 | pos = dest->length;
|
---|
| 4039 | #if ENABLE_HUSH_DOLLAR_OPS
|
---|
| 4040 | last_ch = add_till_closing_bracket(dest, input, end_ch);
|
---|
[3232] | 4041 | if (last_ch == 0) /* error? */
|
---|
| 4042 | return 0;
|
---|
[2725] | 4043 | #else
|
---|
| 4044 | #error Simple code to only allow ${var} is not implemented
|
---|
[1765] | 4045 | #endif
|
---|
[2725] | 4046 | if (as_string) {
|
---|
| 4047 | o_addstr(as_string, dest->data + pos);
|
---|
| 4048 | o_addchr(as_string, last_ch);
|
---|
| 4049 | }
|
---|
| 4050 |
|
---|
| 4051 | if (ENABLE_HUSH_BASH_COMPAT && (end_ch & 0xff00)) {
|
---|
| 4052 | /* close the first block: */
|
---|
| 4053 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4054 | /* while parsing N from ${var:N[:M]}
|
---|
| 4055 | * or pattern from ${var/[/]pattern[/repl]} */
|
---|
| 4056 | if ((end_ch & 0xff) == last_ch) {
|
---|
| 4057 | /* got ':' or '/'- parse the rest */
|
---|
| 4058 | end_ch = '}';
|
---|
| 4059 | goto again;
|
---|
| 4060 | }
|
---|
| 4061 | /* got '}' */
|
---|
| 4062 | if (end_ch == '}' * 0x100 + ':') {
|
---|
| 4063 | /* it's ${var:N} - emulate :999999999 */
|
---|
| 4064 | o_addstr(dest, "999999999");
|
---|
| 4065 | } /* else: it's ${var/[/]pattern} */
|
---|
| 4066 | }
|
---|
| 4067 | break;
|
---|
[821] | 4068 | }
|
---|
| 4069 | }
|
---|
[2725] | 4070 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4071 | break;
|
---|
| 4072 | }
|
---|
| 4073 | #if ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_TICK
|
---|
| 4074 | case '(': {
|
---|
| 4075 | unsigned pos;
|
---|
| 4076 |
|
---|
| 4077 | ch = i_getch(input);
|
---|
| 4078 | nommu_addchr(as_string, ch);
|
---|
| 4079 | # if ENABLE_SH_MATH_SUPPORT
|
---|
| 4080 | if (i_peek(input) == '(') {
|
---|
| 4081 | ch = i_getch(input);
|
---|
| 4082 | nommu_addchr(as_string, ch);
|
---|
| 4083 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4084 | o_addchr(dest, /*quote_mask |*/ '+');
|
---|
| 4085 | if (!BB_MMU)
|
---|
| 4086 | pos = dest->length;
|
---|
[3232] | 4087 | if (!add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG))
|
---|
| 4088 | return 0; /* error */
|
---|
[2725] | 4089 | if (as_string) {
|
---|
| 4090 | o_addstr(as_string, dest->data + pos);
|
---|
| 4091 | o_addchr(as_string, ')');
|
---|
| 4092 | o_addchr(as_string, ')');
|
---|
| 4093 | }
|
---|
| 4094 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4095 | break;
|
---|
| 4096 | }
|
---|
| 4097 | # endif
|
---|
| 4098 | # if ENABLE_HUSH_TICK
|
---|
| 4099 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4100 | o_addchr(dest, quote_mask | '`');
|
---|
| 4101 | if (!BB_MMU)
|
---|
| 4102 | pos = dest->length;
|
---|
[3232] | 4103 | if (!add_till_closing_bracket(dest, input, ')'))
|
---|
| 4104 | return 0; /* error */
|
---|
[2725] | 4105 | if (as_string) {
|
---|
| 4106 | o_addstr(as_string, dest->data + pos);
|
---|
| 4107 | o_addchr(as_string, ')');
|
---|
| 4108 | }
|
---|
| 4109 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4110 | # endif
|
---|
| 4111 | break;
|
---|
| 4112 | }
|
---|
[1765] | 4113 | #endif
|
---|
[2725] | 4114 | case '_':
|
---|
| 4115 | ch = i_getch(input);
|
---|
| 4116 | nommu_addchr(as_string, ch);
|
---|
| 4117 | ch = i_peek(input);
|
---|
| 4118 | if (isalnum(ch)) { /* it's $_name or $_123 */
|
---|
| 4119 | ch = '_';
|
---|
| 4120 | goto make_var;
|
---|
[1765] | 4121 | }
|
---|
[2725] | 4122 | /* else: it's $_ */
|
---|
| 4123 | /* TODO: $_ and $-: */
|
---|
| 4124 | /* $_ Shell or shell script name; or last argument of last command
|
---|
| 4125 | * (if last command wasn't a pipe; if it was, bash sets $_ to "");
|
---|
| 4126 | * but in command's env, set to full pathname used to invoke it */
|
---|
| 4127 | /* $- Option flags set by set builtin or shell options (-i etc) */
|
---|
| 4128 | default:
|
---|
| 4129 | o_addQchr(dest, '$');
|
---|
[821] | 4130 | }
|
---|
[3232] | 4131 | debug_printf_parse("parse_dollar return 1 (ok)\n");
|
---|
| 4132 | return 1;
|
---|
[2725] | 4133 | #undef as_string
|
---|
| 4134 | }
|
---|
[1765] | 4135 |
|
---|
[2725] | 4136 | #if BB_MMU
|
---|
| 4137 | # if ENABLE_HUSH_BASH_COMPAT
|
---|
| 4138 | #define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
|
---|
| 4139 | encode_string(dest, input, dquote_end, process_bkslash)
|
---|
| 4140 | # else
|
---|
| 4141 | /* only ${var/pattern/repl} (its pattern part) needs additional mode */
|
---|
| 4142 | #define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
|
---|
| 4143 | encode_string(dest, input, dquote_end)
|
---|
| 4144 | # endif
|
---|
| 4145 | #define as_string NULL
|
---|
| 4146 |
|
---|
| 4147 | #else /* !MMU */
|
---|
| 4148 |
|
---|
| 4149 | # if ENABLE_HUSH_BASH_COMPAT
|
---|
| 4150 | /* all parameters are needed, no macro tricks */
|
---|
| 4151 | # else
|
---|
| 4152 | #define encode_string(as_string, dest, input, dquote_end, process_bkslash) \
|
---|
| 4153 | encode_string(as_string, dest, input, dquote_end)
|
---|
| 4154 | # endif
|
---|
| 4155 | #endif
|
---|
| 4156 | static int encode_string(o_string *as_string,
|
---|
| 4157 | o_string *dest,
|
---|
| 4158 | struct in_str *input,
|
---|
| 4159 | int dquote_end,
|
---|
| 4160 | int process_bkslash)
|
---|
| 4161 | {
|
---|
| 4162 | #if !ENABLE_HUSH_BASH_COMPAT
|
---|
| 4163 | const int process_bkslash = 1;
|
---|
| 4164 | #endif
|
---|
| 4165 | int ch;
|
---|
| 4166 | int next;
|
---|
| 4167 |
|
---|
| 4168 | again:
|
---|
| 4169 | ch = i_getch(input);
|
---|
| 4170 | if (ch != EOF)
|
---|
| 4171 | nommu_addchr(as_string, ch);
|
---|
| 4172 | if (ch == dquote_end) { /* may be only '"' or EOF */
|
---|
[3232] | 4173 | debug_printf_parse("encode_string return 1 (ok)\n");
|
---|
| 4174 | return 1;
|
---|
[1765] | 4175 | }
|
---|
[2725] | 4176 | /* note: can't move it above ch == dquote_end check! */
|
---|
| 4177 | if (ch == EOF) {
|
---|
| 4178 | syntax_error_unterm_ch('"');
|
---|
[3232] | 4179 | return 0; /* error */
|
---|
[1765] | 4180 | }
|
---|
[2725] | 4181 | next = '\0';
|
---|
| 4182 | if (ch != '\n') {
|
---|
| 4183 | next = i_peek(input);
|
---|
| 4184 | }
|
---|
| 4185 | debug_printf_parse("\" ch=%c (%d) escape=%d\n",
|
---|
| 4186 | ch, ch, !!(dest->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
|
---|
| 4187 | if (process_bkslash && ch == '\\') {
|
---|
| 4188 | if (next == EOF) {
|
---|
| 4189 | syntax_error("\\<eof>");
|
---|
| 4190 | xfunc_die();
|
---|
| 4191 | }
|
---|
| 4192 | /* bash:
|
---|
| 4193 | * "The backslash retains its special meaning [in "..."]
|
---|
| 4194 | * only when followed by one of the following characters:
|
---|
| 4195 | * $, `, ", \, or <newline>. A double quote may be quoted
|
---|
| 4196 | * within double quotes by preceding it with a backslash."
|
---|
| 4197 | * NB: in (unquoted) heredoc, above does not apply to ",
|
---|
| 4198 | * therefore we check for it by "next == dquote_end" cond.
|
---|
| 4199 | */
|
---|
| 4200 | if (next == dquote_end || strchr("$`\\\n", next)) {
|
---|
| 4201 | ch = i_getch(input); /* eat next */
|
---|
| 4202 | if (ch == '\n')
|
---|
| 4203 | goto again; /* skip \<newline> */
|
---|
| 4204 | } /* else: ch remains == '\\', and we double it below: */
|
---|
| 4205 | o_addqchr(dest, ch); /* \c if c is a glob char, else just c */
|
---|
| 4206 | nommu_addchr(as_string, ch);
|
---|
| 4207 | goto again;
|
---|
| 4208 | }
|
---|
| 4209 | if (ch == '$') {
|
---|
[3232] | 4210 | if (!parse_dollar(as_string, dest, input, /*quote_mask:*/ 0x80)) {
|
---|
| 4211 | debug_printf_parse("encode_string return 0: "
|
---|
| 4212 | "parse_dollar returned 0 (error)\n");
|
---|
| 4213 | return 0;
|
---|
[2725] | 4214 | }
|
---|
| 4215 | goto again;
|
---|
| 4216 | }
|
---|
| 4217 | #if ENABLE_HUSH_TICK
|
---|
| 4218 | if (ch == '`') {
|
---|
| 4219 | //unsigned pos = dest->length;
|
---|
| 4220 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4221 | o_addchr(dest, 0x80 | '`');
|
---|
[3232] | 4222 | if (!add_till_backquote(dest, input, /*in_dquote:*/ dquote_end == '"'))
|
---|
| 4223 | return 0; /* error */
|
---|
[2725] | 4224 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4225 | //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
|
---|
| 4226 | goto again;
|
---|
| 4227 | }
|
---|
[1765] | 4228 | #endif
|
---|
[2725] | 4229 | o_addQchr(dest, ch);
|
---|
| 4230 | goto again;
|
---|
| 4231 | #undef as_string
|
---|
[821] | 4232 | }
|
---|
| 4233 |
|
---|
[2725] | 4234 | /*
|
---|
| 4235 | * Scan input until EOF or end_trigger char.
|
---|
| 4236 | * Return a list of pipes to execute, or NULL on EOF
|
---|
| 4237 | * or if end_trigger character is met.
|
---|
[3232] | 4238 | * On syntax error, exit if shell is not interactive,
|
---|
[2725] | 4239 | * reset parsing machinery and start parsing anew,
|
---|
| 4240 | * or return ERR_PTR.
|
---|
| 4241 | */
|
---|
| 4242 | static struct pipe *parse_stream(char **pstring,
|
---|
| 4243 | struct in_str *input,
|
---|
| 4244 | int end_trigger)
|
---|
[821] | 4245 | {
|
---|
[2725] | 4246 | struct parse_context ctx;
|
---|
| 4247 | o_string dest = NULL_O_STRING;
|
---|
| 4248 | int heredoc_cnt;
|
---|
[821] | 4249 |
|
---|
[2725] | 4250 | /* Single-quote triggers a bypass of the main loop until its mate is
|
---|
| 4251 | * found. When recursing, quote state is passed in via dest->o_expflags.
|
---|
| 4252 | */
|
---|
| 4253 | debug_printf_parse("parse_stream entered, end_trigger='%c'\n",
|
---|
| 4254 | end_trigger ? end_trigger : 'X');
|
---|
| 4255 | debug_enter();
|
---|
| 4256 |
|
---|
| 4257 | /* If very first arg is "" or '', dest.data may end up NULL.
|
---|
| 4258 | * Preventing this: */
|
---|
| 4259 | o_addchr(&dest, '\0');
|
---|
| 4260 | dest.length = 0;
|
---|
| 4261 |
|
---|
| 4262 | /* We used to separate words on $IFS here. This was wrong.
|
---|
| 4263 | * $IFS is used only for word splitting when $var is expanded,
|
---|
| 4264 | * here we should use blank chars as separators, not $IFS
|
---|
| 4265 | */
|
---|
| 4266 |
|
---|
| 4267 | if (MAYBE_ASSIGNMENT != 0)
|
---|
| 4268 | dest.o_assignment = MAYBE_ASSIGNMENT;
|
---|
| 4269 | initialize_context(&ctx);
|
---|
| 4270 | heredoc_cnt = 0;
|
---|
| 4271 | while (1) {
|
---|
| 4272 | const char *is_blank;
|
---|
| 4273 | const char *is_special;
|
---|
| 4274 | int ch;
|
---|
| 4275 | int next;
|
---|
| 4276 | int redir_fd;
|
---|
| 4277 | redir_type redir_style;
|
---|
| 4278 |
|
---|
| 4279 | ch = i_getch(input);
|
---|
| 4280 | debug_printf_parse(": ch=%c (%d) escape=%d\n",
|
---|
| 4281 | ch, ch, !!(dest.o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
|
---|
| 4282 | if (ch == EOF) {
|
---|
| 4283 | struct pipe *pi;
|
---|
| 4284 |
|
---|
| 4285 | if (heredoc_cnt) {
|
---|
| 4286 | syntax_error_unterm_str("here document");
|
---|
| 4287 | goto parse_error;
|
---|
[821] | 4288 | }
|
---|
[2725] | 4289 | /* end_trigger == '}' case errors out earlier,
|
---|
| 4290 | * checking only ')' */
|
---|
| 4291 | if (end_trigger == ')') {
|
---|
[3232] | 4292 | syntax_error_unterm_ch('(');
|
---|
| 4293 | goto parse_error;
|
---|
[2725] | 4294 | }
|
---|
| 4295 |
|
---|
| 4296 | if (done_word(&dest, &ctx)) {
|
---|
| 4297 | goto parse_error;
|
---|
| 4298 | }
|
---|
| 4299 | o_free(&dest);
|
---|
| 4300 | done_pipe(&ctx, PIPE_SEQ);
|
---|
| 4301 | pi = ctx.list_head;
|
---|
| 4302 | /* If we got nothing... */
|
---|
| 4303 | /* (this makes bare "&" cmd a no-op.
|
---|
| 4304 | * bash says: "syntax error near unexpected token '&'") */
|
---|
| 4305 | if (pi->num_cmds == 0
|
---|
[3232] | 4306 | IF_HAS_KEYWORDS(&& pi->res_word == RES_NONE)
|
---|
[2725] | 4307 | ) {
|
---|
| 4308 | free_pipe_list(pi);
|
---|
| 4309 | pi = NULL;
|
---|
| 4310 | }
|
---|
| 4311 | #if !BB_MMU
|
---|
[3621] | 4312 | debug_printf_parse("as_string1 '%s'\n", ctx.as_string.data);
|
---|
[2725] | 4313 | if (pstring)
|
---|
| 4314 | *pstring = ctx.as_string.data;
|
---|
| 4315 | else
|
---|
| 4316 | o_free_unsafe(&ctx.as_string);
|
---|
| 4317 | #endif
|
---|
| 4318 | debug_leave();
|
---|
| 4319 | debug_printf_parse("parse_stream return %p\n", pi);
|
---|
| 4320 | return pi;
|
---|
[821] | 4321 | }
|
---|
[2725] | 4322 | nommu_addchr(&ctx.as_string, ch);
|
---|
| 4323 |
|
---|
| 4324 | next = '\0';
|
---|
| 4325 | if (ch != '\n')
|
---|
| 4326 | next = i_peek(input);
|
---|
| 4327 |
|
---|
| 4328 | is_special = "{}<>;&|()#'" /* special outside of "str" */
|
---|
| 4329 | "\\$\"" IF_HUSH_TICK("`"); /* always special */
|
---|
| 4330 | /* Are { and } special here? */
|
---|
| 4331 | if (ctx.command->argv /* word [word]{... - non-special */
|
---|
| 4332 | || dest.length /* word{... - non-special */
|
---|
| 4333 | || dest.has_quoted_part /* ""{... - non-special */
|
---|
| 4334 | || (next != ';' /* }; - special */
|
---|
| 4335 | && next != ')' /* }) - special */
|
---|
| 4336 | && next != '&' /* }& and }&& ... - special */
|
---|
| 4337 | && next != '|' /* }|| ... - special */
|
---|
| 4338 | && !strchr(defifs, next) /* {word - non-special */
|
---|
| 4339 | )
|
---|
| 4340 | ) {
|
---|
| 4341 | /* They are not special, skip "{}" */
|
---|
| 4342 | is_special += 2;
|
---|
| 4343 | }
|
---|
| 4344 | is_special = strchr(is_special, ch);
|
---|
| 4345 | is_blank = strchr(defifs, ch);
|
---|
| 4346 |
|
---|
| 4347 | if (!is_special && !is_blank) { /* ordinary char */
|
---|
| 4348 | ordinary_char:
|
---|
| 4349 | o_addQchr(&dest, ch);
|
---|
| 4350 | if ((dest.o_assignment == MAYBE_ASSIGNMENT
|
---|
| 4351 | || dest.o_assignment == WORD_IS_KEYWORD)
|
---|
| 4352 | && ch == '='
|
---|
| 4353 | && is_well_formed_var_name(dest.data, '=')
|
---|
| 4354 | ) {
|
---|
| 4355 | dest.o_assignment = DEFINITELY_ASSIGNMENT;
|
---|
[2859] | 4356 | debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
---|
[2725] | 4357 | }
|
---|
| 4358 | continue;
|
---|
| 4359 | }
|
---|
| 4360 |
|
---|
| 4361 | if (is_blank) {
|
---|
| 4362 | if (done_word(&dest, &ctx)) {
|
---|
| 4363 | goto parse_error;
|
---|
| 4364 | }
|
---|
| 4365 | if (ch == '\n') {
|
---|
| 4366 | /* Is this a case when newline is simply ignored?
|
---|
| 4367 | * Some examples:
|
---|
| 4368 | * "cmd | <newline> cmd ..."
|
---|
| 4369 | * "case ... in <newline> word) ..."
|
---|
| 4370 | */
|
---|
| 4371 | if (IS_NULL_CMD(ctx.command)
|
---|
| 4372 | && dest.length == 0 && !dest.has_quoted_part
|
---|
| 4373 | ) {
|
---|
| 4374 | /* This newline can be ignored. But...
|
---|
| 4375 | * Without check #1, interactive shell
|
---|
| 4376 | * ignores even bare <newline>,
|
---|
| 4377 | * and shows the continuation prompt:
|
---|
| 4378 | * ps1_prompt$ <enter>
|
---|
| 4379 | * ps2> _ <=== wrong, should be ps1
|
---|
| 4380 | * Without check #2, "cmd & <newline>"
|
---|
| 4381 | * is similarly mistreated.
|
---|
| 4382 | * (BTW, this makes "cmd & cmd"
|
---|
| 4383 | * and "cmd && cmd" non-orthogonal.
|
---|
| 4384 | * Really, ask yourself, why
|
---|
| 4385 | * "cmd && <newline>" doesn't start
|
---|
| 4386 | * cmd but waits for more input?
|
---|
| 4387 | * No reason...)
|
---|
| 4388 | */
|
---|
| 4389 | struct pipe *pi = ctx.list_head;
|
---|
| 4390 | if (pi->num_cmds != 0 /* check #1 */
|
---|
| 4391 | && pi->followup != PIPE_BG /* check #2 */
|
---|
| 4392 | ) {
|
---|
| 4393 | continue;
|
---|
| 4394 | }
|
---|
[821] | 4395 | }
|
---|
[2725] | 4396 | /* Treat newline as a command separator. */
|
---|
| 4397 | done_pipe(&ctx, PIPE_SEQ);
|
---|
| 4398 | debug_printf_parse("heredoc_cnt:%d\n", heredoc_cnt);
|
---|
| 4399 | if (heredoc_cnt) {
|
---|
| 4400 | if (fetch_heredocs(heredoc_cnt, &ctx, input)) {
|
---|
| 4401 | goto parse_error;
|
---|
| 4402 | }
|
---|
| 4403 | heredoc_cnt = 0;
|
---|
| 4404 | }
|
---|
| 4405 | dest.o_assignment = MAYBE_ASSIGNMENT;
|
---|
[2859] | 4406 | debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
---|
[2725] | 4407 | ch = ';';
|
---|
| 4408 | /* note: if (is_blank) continue;
|
---|
| 4409 | * will still trigger for us */
|
---|
| 4410 | }
|
---|
| 4411 | }
|
---|
| 4412 |
|
---|
| 4413 | /* "cmd}" or "cmd }..." without semicolon or &:
|
---|
| 4414 | * } is an ordinary char in this case, even inside { cmd; }
|
---|
| 4415 | * Pathological example: { ""}; } should exec "}" cmd
|
---|
| 4416 | */
|
---|
| 4417 | if (ch == '}') {
|
---|
| 4418 | if (!IS_NULL_CMD(ctx.command) /* cmd } */
|
---|
| 4419 | || dest.length != 0 /* word} */
|
---|
| 4420 | || dest.has_quoted_part /* ""} */
|
---|
| 4421 | ) {
|
---|
| 4422 | goto ordinary_char;
|
---|
| 4423 | }
|
---|
| 4424 | if (!IS_NULL_PIPE(ctx.pipe)) /* cmd | } */
|
---|
| 4425 | goto skip_end_trigger;
|
---|
| 4426 | /* else: } does terminate a group */
|
---|
| 4427 | }
|
---|
| 4428 |
|
---|
| 4429 | if (end_trigger && end_trigger == ch
|
---|
| 4430 | && (ch != ';' || heredoc_cnt == 0)
|
---|
| 4431 | #if ENABLE_HUSH_CASE
|
---|
| 4432 | && (ch != ')'
|
---|
| 4433 | || ctx.ctx_res_w != RES_MATCH
|
---|
| 4434 | || (!dest.has_quoted_part && strcmp(dest.data, "esac") == 0)
|
---|
| 4435 | )
|
---|
| 4436 | #endif
|
---|
| 4437 | ) {
|
---|
| 4438 | if (heredoc_cnt) {
|
---|
| 4439 | /* This is technically valid:
|
---|
| 4440 | * { cat <<HERE; }; echo Ok
|
---|
| 4441 | * heredoc
|
---|
| 4442 | * heredoc
|
---|
| 4443 | * HERE
|
---|
| 4444 | * but we don't support this.
|
---|
| 4445 | * We require heredoc to be in enclosing {}/(),
|
---|
| 4446 | * if any.
|
---|
| 4447 | */
|
---|
| 4448 | syntax_error_unterm_str("here document");
|
---|
| 4449 | goto parse_error;
|
---|
| 4450 | }
|
---|
| 4451 | if (done_word(&dest, &ctx)) {
|
---|
| 4452 | goto parse_error;
|
---|
| 4453 | }
|
---|
| 4454 | done_pipe(&ctx, PIPE_SEQ);
|
---|
| 4455 | dest.o_assignment = MAYBE_ASSIGNMENT;
|
---|
[2859] | 4456 | debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
---|
[2725] | 4457 | /* Do we sit outside of any if's, loops or case's? */
|
---|
| 4458 | if (!HAS_KEYWORDS
|
---|
[3232] | 4459 | IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0))
|
---|
[2725] | 4460 | ) {
|
---|
| 4461 | o_free(&dest);
|
---|
| 4462 | #if !BB_MMU
|
---|
[3621] | 4463 | debug_printf_parse("as_string2 '%s'\n", ctx.as_string.data);
|
---|
[2725] | 4464 | if (pstring)
|
---|
| 4465 | *pstring = ctx.as_string.data;
|
---|
| 4466 | else
|
---|
| 4467 | o_free_unsafe(&ctx.as_string);
|
---|
| 4468 | #endif
|
---|
| 4469 | debug_leave();
|
---|
| 4470 | debug_printf_parse("parse_stream return %p: "
|
---|
| 4471 | "end_trigger char found\n",
|
---|
| 4472 | ctx.list_head);
|
---|
| 4473 | return ctx.list_head;
|
---|
| 4474 | }
|
---|
| 4475 | }
|
---|
| 4476 | skip_end_trigger:
|
---|
| 4477 | if (is_blank)
|
---|
| 4478 | continue;
|
---|
| 4479 |
|
---|
| 4480 | /* Catch <, > before deciding whether this word is
|
---|
| 4481 | * an assignment. a=1 2>z b=2: b=2 is still assignment */
|
---|
| 4482 | switch (ch) {
|
---|
| 4483 | case '>':
|
---|
| 4484 | redir_fd = redirect_opt_num(&dest);
|
---|
| 4485 | if (done_word(&dest, &ctx)) {
|
---|
| 4486 | goto parse_error;
|
---|
| 4487 | }
|
---|
| 4488 | redir_style = REDIRECT_OVERWRITE;
|
---|
| 4489 | if (next == '>') {
|
---|
| 4490 | redir_style = REDIRECT_APPEND;
|
---|
| 4491 | ch = i_getch(input);
|
---|
| 4492 | nommu_addchr(&ctx.as_string, ch);
|
---|
| 4493 | }
|
---|
| 4494 | #if 0
|
---|
| 4495 | else if (next == '(') {
|
---|
| 4496 | syntax_error(">(process) not supported");
|
---|
| 4497 | goto parse_error;
|
---|
| 4498 | }
|
---|
| 4499 | #endif
|
---|
| 4500 | if (parse_redirect(&ctx, redir_fd, redir_style, input))
|
---|
| 4501 | goto parse_error;
|
---|
| 4502 | continue; /* back to top of while (1) */
|
---|
| 4503 | case '<':
|
---|
| 4504 | redir_fd = redirect_opt_num(&dest);
|
---|
| 4505 | if (done_word(&dest, &ctx)) {
|
---|
| 4506 | goto parse_error;
|
---|
| 4507 | }
|
---|
| 4508 | redir_style = REDIRECT_INPUT;
|
---|
| 4509 | if (next == '<') {
|
---|
| 4510 | redir_style = REDIRECT_HEREDOC;
|
---|
| 4511 | heredoc_cnt++;
|
---|
| 4512 | debug_printf_parse("++heredoc_cnt=%d\n", heredoc_cnt);
|
---|
| 4513 | ch = i_getch(input);
|
---|
| 4514 | nommu_addchr(&ctx.as_string, ch);
|
---|
| 4515 | } else if (next == '>') {
|
---|
| 4516 | redir_style = REDIRECT_IO;
|
---|
| 4517 | ch = i_getch(input);
|
---|
| 4518 | nommu_addchr(&ctx.as_string, ch);
|
---|
| 4519 | }
|
---|
| 4520 | #if 0
|
---|
| 4521 | else if (next == '(') {
|
---|
| 4522 | syntax_error("<(process) not supported");
|
---|
| 4523 | goto parse_error;
|
---|
| 4524 | }
|
---|
| 4525 | #endif
|
---|
| 4526 | if (parse_redirect(&ctx, redir_fd, redir_style, input))
|
---|
| 4527 | goto parse_error;
|
---|
| 4528 | continue; /* back to top of while (1) */
|
---|
| 4529 | case '#':
|
---|
| 4530 | if (dest.length == 0 && !dest.has_quoted_part) {
|
---|
| 4531 | /* skip "#comment" */
|
---|
| 4532 | while (1) {
|
---|
| 4533 | ch = i_peek(input);
|
---|
| 4534 | if (ch == EOF || ch == '\n')
|
---|
| 4535 | break;
|
---|
| 4536 | i_getch(input);
|
---|
| 4537 | /* note: we do not add it to &ctx.as_string */
|
---|
| 4538 | }
|
---|
| 4539 | nommu_addchr(&ctx.as_string, '\n');
|
---|
| 4540 | continue; /* back to top of while (1) */
|
---|
| 4541 | }
|
---|
| 4542 | break;
|
---|
| 4543 | case '\\':
|
---|
| 4544 | if (next == '\n') {
|
---|
| 4545 | /* It's "\<newline>" */
|
---|
| 4546 | #if !BB_MMU
|
---|
| 4547 | /* Remove trailing '\' from ctx.as_string */
|
---|
| 4548 | ctx.as_string.data[--ctx.as_string.length] = '\0';
|
---|
| 4549 | #endif
|
---|
| 4550 | ch = i_getch(input); /* eat it */
|
---|
| 4551 | continue; /* back to top of while (1) */
|
---|
| 4552 | }
|
---|
| 4553 | break;
|
---|
| 4554 | }
|
---|
| 4555 |
|
---|
| 4556 | if (dest.o_assignment == MAYBE_ASSIGNMENT
|
---|
| 4557 | /* check that we are not in word in "a=1 2>word b=1": */
|
---|
| 4558 | && !ctx.pending_redirect
|
---|
| 4559 | ) {
|
---|
| 4560 | /* ch is a special char and thus this word
|
---|
| 4561 | * cannot be an assignment */
|
---|
| 4562 | dest.o_assignment = NOT_ASSIGNMENT;
|
---|
[2859] | 4563 | debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
---|
[2725] | 4564 | }
|
---|
| 4565 |
|
---|
| 4566 | /* Note: nommu_addchr(&ctx.as_string, ch) is already done */
|
---|
| 4567 |
|
---|
| 4568 | switch (ch) {
|
---|
| 4569 | case '#': /* non-comment #: "echo a#b" etc */
|
---|
| 4570 | o_addQchr(&dest, ch);
|
---|
| 4571 | break;
|
---|
| 4572 | case '\\':
|
---|
| 4573 | if (next == EOF) {
|
---|
| 4574 | syntax_error("\\<eof>");
|
---|
| 4575 | xfunc_die();
|
---|
| 4576 | }
|
---|
| 4577 | ch = i_getch(input);
|
---|
| 4578 | /* note: ch != '\n' (that case does not reach this place) */
|
---|
| 4579 | o_addchr(&dest, '\\');
|
---|
| 4580 | /*nommu_addchr(&ctx.as_string, '\\'); - already done */
|
---|
| 4581 | o_addchr(&dest, ch);
|
---|
| 4582 | nommu_addchr(&ctx.as_string, ch);
|
---|
| 4583 | /* Example: echo Hello \2>file
|
---|
| 4584 | * we need to know that word 2 is quoted */
|
---|
| 4585 | dest.has_quoted_part = 1;
|
---|
| 4586 | break;
|
---|
| 4587 | case '$':
|
---|
[3232] | 4588 | if (!parse_dollar(&ctx.as_string, &dest, input, /*quote_mask:*/ 0)) {
|
---|
[2725] | 4589 | debug_printf_parse("parse_stream parse error: "
|
---|
[3232] | 4590 | "parse_dollar returned 0 (error)\n");
|
---|
[2725] | 4591 | goto parse_error;
|
---|
| 4592 | }
|
---|
| 4593 | break;
|
---|
| 4594 | case '\'':
|
---|
| 4595 | dest.has_quoted_part = 1;
|
---|
[3232] | 4596 | if (next == '\'' && !ctx.pending_redirect) {
|
---|
| 4597 | insert_empty_quoted_str_marker:
|
---|
| 4598 | nommu_addchr(&ctx.as_string, next);
|
---|
| 4599 | i_getch(input); /* eat second ' */
|
---|
| 4600 | o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4601 | o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4602 | } else {
|
---|
| 4603 | while (1) {
|
---|
| 4604 | ch = i_getch(input);
|
---|
| 4605 | if (ch == EOF) {
|
---|
| 4606 | syntax_error_unterm_ch('\'');
|
---|
| 4607 | goto parse_error;
|
---|
| 4608 | }
|
---|
| 4609 | nommu_addchr(&ctx.as_string, ch);
|
---|
| 4610 | if (ch == '\'')
|
---|
| 4611 | break;
|
---|
| 4612 | o_addqchr(&dest, ch);
|
---|
[2725] | 4613 | }
|
---|
| 4614 | }
|
---|
| 4615 | break;
|
---|
| 4616 | case '"':
|
---|
| 4617 | dest.has_quoted_part = 1;
|
---|
[3232] | 4618 | if (next == '"' && !ctx.pending_redirect)
|
---|
| 4619 | goto insert_empty_quoted_str_marker;
|
---|
[2725] | 4620 | if (dest.o_assignment == NOT_ASSIGNMENT)
|
---|
| 4621 | dest.o_expflags |= EXP_FLAG_ESC_GLOB_CHARS;
|
---|
[3232] | 4622 | if (!encode_string(&ctx.as_string, &dest, input, '"', /*process_bkslash:*/ 1))
|
---|
[2725] | 4623 | goto parse_error;
|
---|
| 4624 | dest.o_expflags &= ~EXP_FLAG_ESC_GLOB_CHARS;
|
---|
| 4625 | break;
|
---|
| 4626 | #if ENABLE_HUSH_TICK
|
---|
| 4627 | case '`': {
|
---|
[3232] | 4628 | USE_FOR_NOMMU(unsigned pos;)
|
---|
[2725] | 4629 |
|
---|
| 4630 | o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4631 | o_addchr(&dest, '`');
|
---|
[3232] | 4632 | USE_FOR_NOMMU(pos = dest.length;)
|
---|
| 4633 | if (!add_till_backquote(&dest, input, /*in_dquote:*/ 0))
|
---|
| 4634 | goto parse_error;
|
---|
[2725] | 4635 | # if !BB_MMU
|
---|
| 4636 | o_addstr(&ctx.as_string, dest.data + pos);
|
---|
| 4637 | o_addchr(&ctx.as_string, '`');
|
---|
| 4638 | # endif
|
---|
| 4639 | o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
---|
| 4640 | //debug_printf_subst("SUBST RES3 '%s'\n", dest.data + pos);
|
---|
| 4641 | break;
|
---|
| 4642 | }
|
---|
| 4643 | #endif
|
---|
| 4644 | case ';':
|
---|
| 4645 | #if ENABLE_HUSH_CASE
|
---|
| 4646 | case_semi:
|
---|
| 4647 | #endif
|
---|
| 4648 | if (done_word(&dest, &ctx)) {
|
---|
| 4649 | goto parse_error;
|
---|
| 4650 | }
|
---|
| 4651 | done_pipe(&ctx, PIPE_SEQ);
|
---|
| 4652 | #if ENABLE_HUSH_CASE
|
---|
| 4653 | /* Eat multiple semicolons, detect
|
---|
| 4654 | * whether it means something special */
|
---|
| 4655 | while (1) {
|
---|
| 4656 | ch = i_peek(input);
|
---|
| 4657 | if (ch != ';')
|
---|
| 4658 | break;
|
---|
| 4659 | ch = i_getch(input);
|
---|
| 4660 | nommu_addchr(&ctx.as_string, ch);
|
---|
| 4661 | if (ctx.ctx_res_w == RES_CASE_BODY) {
|
---|
| 4662 | ctx.ctx_dsemicolon = 1;
|
---|
| 4663 | ctx.ctx_res_w = RES_MATCH;
|
---|
| 4664 | break;
|
---|
| 4665 | }
|
---|
| 4666 | }
|
---|
| 4667 | #endif
|
---|
| 4668 | new_cmd:
|
---|
| 4669 | /* We just finished a cmd. New one may start
|
---|
| 4670 | * with an assignment */
|
---|
| 4671 | dest.o_assignment = MAYBE_ASSIGNMENT;
|
---|
[2859] | 4672 | debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
---|
[2725] | 4673 | break;
|
---|
| 4674 | case '&':
|
---|
| 4675 | if (done_word(&dest, &ctx)) {
|
---|
| 4676 | goto parse_error;
|
---|
| 4677 | }
|
---|
| 4678 | if (next == '&') {
|
---|
| 4679 | ch = i_getch(input);
|
---|
| 4680 | nommu_addchr(&ctx.as_string, ch);
|
---|
| 4681 | done_pipe(&ctx, PIPE_AND);
|
---|
[821] | 4682 | } else {
|
---|
[2725] | 4683 | done_pipe(&ctx, PIPE_BG);
|
---|
[821] | 4684 | }
|
---|
[2725] | 4685 | goto new_cmd;
|
---|
| 4686 | case '|':
|
---|
| 4687 | if (done_word(&dest, &ctx)) {
|
---|
| 4688 | goto parse_error;
|
---|
| 4689 | }
|
---|
| 4690 | #if ENABLE_HUSH_CASE
|
---|
| 4691 | if (ctx.ctx_res_w == RES_MATCH)
|
---|
| 4692 | break; /* we are in case's "word | word)" */
|
---|
| 4693 | #endif
|
---|
| 4694 | if (next == '|') { /* || */
|
---|
| 4695 | ch = i_getch(input);
|
---|
| 4696 | nommu_addchr(&ctx.as_string, ch);
|
---|
| 4697 | done_pipe(&ctx, PIPE_OR);
|
---|
| 4698 | } else {
|
---|
| 4699 | /* we could pick up a file descriptor choice here
|
---|
| 4700 | * with redirect_opt_num(), but bash doesn't do it.
|
---|
| 4701 | * "echo foo 2| cat" yields "foo 2". */
|
---|
| 4702 | done_command(&ctx);
|
---|
| 4703 | }
|
---|
| 4704 | goto new_cmd;
|
---|
| 4705 | case '(':
|
---|
| 4706 | #if ENABLE_HUSH_CASE
|
---|
| 4707 | /* "case... in [(]word)..." - skip '(' */
|
---|
| 4708 | if (ctx.ctx_res_w == RES_MATCH
|
---|
| 4709 | && ctx.command->argv == NULL /* not (word|(... */
|
---|
| 4710 | && dest.length == 0 /* not word(... */
|
---|
| 4711 | && dest.has_quoted_part == 0 /* not ""(... */
|
---|
| 4712 | ) {
|
---|
| 4713 | continue;
|
---|
| 4714 | }
|
---|
| 4715 | #endif
|
---|
| 4716 | case '{':
|
---|
| 4717 | if (parse_group(&dest, &ctx, input, ch) != 0) {
|
---|
| 4718 | goto parse_error;
|
---|
| 4719 | }
|
---|
| 4720 | goto new_cmd;
|
---|
| 4721 | case ')':
|
---|
| 4722 | #if ENABLE_HUSH_CASE
|
---|
| 4723 | if (ctx.ctx_res_w == RES_MATCH)
|
---|
| 4724 | goto case_semi;
|
---|
| 4725 | #endif
|
---|
| 4726 | case '}':
|
---|
| 4727 | /* proper use of this character is caught by end_trigger:
|
---|
| 4728 | * if we see {, we call parse_group(..., end_trigger='}')
|
---|
| 4729 | * and it will match } earlier (not here). */
|
---|
| 4730 | syntax_error_unexpected_ch(ch);
|
---|
| 4731 | goto parse_error;
|
---|
| 4732 | default:
|
---|
| 4733 | if (HUSH_DEBUG)
|
---|
| 4734 | bb_error_msg_and_die("BUG: unexpected %c\n", ch);
|
---|
[821] | 4735 | }
|
---|
[2725] | 4736 | } /* while (1) */
|
---|
| 4737 |
|
---|
| 4738 | parse_error:
|
---|
| 4739 | {
|
---|
| 4740 | struct parse_context *pctx;
|
---|
| 4741 | IF_HAS_KEYWORDS(struct parse_context *p2;)
|
---|
| 4742 |
|
---|
| 4743 | /* Clean up allocated tree.
|
---|
| 4744 | * Sample for finding leaks on syntax error recovery path.
|
---|
| 4745 | * Run it from interactive shell, watch pmap `pidof hush`.
|
---|
| 4746 | * while if false; then false; fi; do break; fi
|
---|
| 4747 | * Samples to catch leaks at execution:
|
---|
| 4748 | * while if (true | {true;}); then echo ok; fi; do break; done
|
---|
| 4749 | * while if (true | {true;}); then echo ok; fi; do (if echo ok; break; then :; fi) | cat; break; done
|
---|
| 4750 | */
|
---|
| 4751 | pctx = &ctx;
|
---|
| 4752 | do {
|
---|
| 4753 | /* Update pipe/command counts,
|
---|
| 4754 | * otherwise freeing may miss some */
|
---|
| 4755 | done_pipe(pctx, PIPE_SEQ);
|
---|
| 4756 | debug_printf_clean("freeing list %p from ctx %p\n",
|
---|
| 4757 | pctx->list_head, pctx);
|
---|
| 4758 | debug_print_tree(pctx->list_head, 0);
|
---|
| 4759 | free_pipe_list(pctx->list_head);
|
---|
| 4760 | debug_printf_clean("freed list %p\n", pctx->list_head);
|
---|
| 4761 | #if !BB_MMU
|
---|
| 4762 | o_free_unsafe(&pctx->as_string);
|
---|
| 4763 | #endif
|
---|
| 4764 | IF_HAS_KEYWORDS(p2 = pctx->stack;)
|
---|
| 4765 | if (pctx != &ctx) {
|
---|
| 4766 | free(pctx);
|
---|
| 4767 | }
|
---|
| 4768 | IF_HAS_KEYWORDS(pctx = p2;)
|
---|
| 4769 | } while (HAS_KEYWORDS && pctx);
|
---|
[3232] | 4770 |
|
---|
[2725] | 4771 | o_free(&dest);
|
---|
[3232] | 4772 | G.last_exitcode = 1;
|
---|
[2725] | 4773 | #if !BB_MMU
|
---|
[3232] | 4774 | if (pstring)
|
---|
| 4775 | *pstring = NULL;
|
---|
[2725] | 4776 | #endif
|
---|
[3232] | 4777 | debug_leave();
|
---|
| 4778 | return ERR_PTR;
|
---|
[821] | 4779 | }
|
---|
| 4780 | }
|
---|
| 4781 |
|
---|
[2725] | 4782 |
|
---|
| 4783 | /*** Execution routines ***/
|
---|
| 4784 |
|
---|
| 4785 | /* Expansion can recurse, need forward decls: */
|
---|
| 4786 | #if !ENABLE_HUSH_BASH_COMPAT
|
---|
| 4787 | /* only ${var/pattern/repl} (its pattern part) needs additional mode */
|
---|
| 4788 | #define expand_string_to_string(str, do_unbackslash) \
|
---|
| 4789 | expand_string_to_string(str)
|
---|
| 4790 | #endif
|
---|
| 4791 | static char *expand_string_to_string(const char *str, int do_unbackslash);
|
---|
| 4792 | #if ENABLE_HUSH_TICK
|
---|
| 4793 | static int process_command_subs(o_string *dest, const char *s);
|
---|
| 4794 | #endif
|
---|
| 4795 |
|
---|
| 4796 | /* expand_strvec_to_strvec() takes a list of strings, expands
|
---|
| 4797 | * all variable references within and returns a pointer to
|
---|
| 4798 | * a list of expanded strings, possibly with larger number
|
---|
| 4799 | * of strings. (Think VAR="a b"; echo $VAR).
|
---|
| 4800 | * This new list is allocated as a single malloc block.
|
---|
| 4801 | * NULL-terminated list of char* pointers is at the beginning of it,
|
---|
| 4802 | * followed by strings themselves.
|
---|
| 4803 | * Caller can deallocate entire list by single free(list). */
|
---|
| 4804 |
|
---|
| 4805 | /* A horde of its helpers come first: */
|
---|
| 4806 |
|
---|
| 4807 | static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len)
|
---|
[821] | 4808 | {
|
---|
[2725] | 4809 | while (--len >= 0) {
|
---|
| 4810 | char c = *str++;
|
---|
[1765] | 4811 |
|
---|
[2725] | 4812 | #if ENABLE_HUSH_BRACE_EXPANSION
|
---|
| 4813 | if (c == '{' || c == '}') {
|
---|
| 4814 | /* { -> \{, } -> \} */
|
---|
| 4815 | o_addchr(o, '\\');
|
---|
| 4816 | /* And now we want to add { or } and continue:
|
---|
| 4817 | * o_addchr(o, c);
|
---|
| 4818 | * continue;
|
---|
| 4819 | * luckily, just falling throught achieves this.
|
---|
| 4820 | */
|
---|
| 4821 | }
|
---|
| 4822 | #endif
|
---|
| 4823 | o_addchr(o, c);
|
---|
| 4824 | if (c == '\\') {
|
---|
| 4825 | /* \z -> \\\z; \<eol> -> \\<eol> */
|
---|
| 4826 | o_addchr(o, '\\');
|
---|
| 4827 | if (len) {
|
---|
| 4828 | len--;
|
---|
| 4829 | o_addchr(o, '\\');
|
---|
| 4830 | o_addchr(o, *str++);
|
---|
| 4831 | }
|
---|
| 4832 | }
|
---|
[821] | 4833 | }
|
---|
| 4834 | }
|
---|
| 4835 |
|
---|
[2725] | 4836 | /* Store given string, finalizing the word and starting new one whenever
|
---|
| 4837 | * we encounter IFS char(s). This is used for expanding variable values.
|
---|
[3232] | 4838 | * End-of-string does NOT finalize word: think about 'echo -$VAR-'.
|
---|
| 4839 | * Return in *ended_with_ifs:
|
---|
| 4840 | * 1 - ended with IFS char, else 0 (this includes case of empty str).
|
---|
| 4841 | */
|
---|
| 4842 | static int expand_on_ifs(int *ended_with_ifs, o_string *output, int n, const char *str)
|
---|
[821] | 4843 | {
|
---|
[3232] | 4844 | int last_is_ifs = 0;
|
---|
| 4845 |
|
---|
[2725] | 4846 | while (1) {
|
---|
[3232] | 4847 | int word_len;
|
---|
| 4848 |
|
---|
| 4849 | if (!*str) /* EOL - do not finalize word */
|
---|
| 4850 | break;
|
---|
| 4851 | word_len = strcspn(str, G.ifs);
|
---|
[2725] | 4852 | if (word_len) {
|
---|
[3232] | 4853 | /* We have WORD_LEN leading non-IFS chars */
|
---|
[2725] | 4854 | if (!(output->o_expflags & EXP_FLAG_GLOB)) {
|
---|
| 4855 | o_addblock(output, str, word_len);
|
---|
| 4856 | } else {
|
---|
| 4857 | /* Protect backslashes against globbing up :)
|
---|
| 4858 | * Example: "v='\*'; echo b$v" prints "b\*"
|
---|
| 4859 | * (and does not try to glob on "*")
|
---|
| 4860 | */
|
---|
| 4861 | o_addblock_duplicate_backslash(output, str, word_len);
|
---|
| 4862 | /*/ Why can't we do it easier? */
|
---|
| 4863 | /*o_addblock(output, str, word_len); - WRONG: "v='\*'; echo Z$v" prints "Z*" instead of "Z\*" */
|
---|
| 4864 | /*o_addqblock(output, str, word_len); - WRONG: "v='*'; echo Z$v" prints "Z*" instead of Z* files */
|
---|
| 4865 | }
|
---|
[3232] | 4866 | last_is_ifs = 0;
|
---|
[2725] | 4867 | str += word_len;
|
---|
[3232] | 4868 | if (!*str) /* EOL - do not finalize word */
|
---|
| 4869 | break;
|
---|
[2725] | 4870 | }
|
---|
[3232] | 4871 |
|
---|
| 4872 | /* We know str here points to at least one IFS char */
|
---|
| 4873 | last_is_ifs = 1;
|
---|
| 4874 | str += strspn(str, G.ifs); /* skip IFS chars */
|
---|
[2725] | 4875 | if (!*str) /* EOL - do not finalize word */
|
---|
| 4876 | break;
|
---|
[3232] | 4877 |
|
---|
| 4878 | /* Start new word... but not always! */
|
---|
| 4879 | /* Case "v=' a'; echo ''$v": we do need to finalize empty word: */
|
---|
| 4880 | if (output->has_quoted_part
|
---|
| 4881 | /* Case "v=' a'; echo $v":
|
---|
| 4882 | * here nothing precedes the space in $v expansion,
|
---|
| 4883 | * therefore we should not finish the word
|
---|
| 4884 | * (IOW: if there *is* word to finalize, only then do it):
|
---|
| 4885 | */
|
---|
| 4886 | || (n > 0 && output->data[output->length - 1])
|
---|
| 4887 | ) {
|
---|
| 4888 | o_addchr(output, '\0');
|
---|
| 4889 | debug_print_list("expand_on_ifs", output, n);
|
---|
| 4890 | n = o_save_ptr(output, n);
|
---|
| 4891 | }
|
---|
[821] | 4892 | }
|
---|
[3232] | 4893 |
|
---|
| 4894 | if (ended_with_ifs)
|
---|
| 4895 | *ended_with_ifs = last_is_ifs;
|
---|
[2725] | 4896 | debug_print_list("expand_on_ifs[1]", output, n);
|
---|
| 4897 | return n;
|
---|
[821] | 4898 | }
|
---|
| 4899 |
|
---|
[2725] | 4900 | /* Helper to expand $((...)) and heredoc body. These act as if
|
---|
| 4901 | * they are in double quotes, with the exception that they are not :).
|
---|
| 4902 | * Just the rules are similar: "expand only $var and `cmd`"
|
---|
| 4903 | *
|
---|
| 4904 | * Returns malloced string.
|
---|
| 4905 | * As an optimization, we return NULL if expansion is not needed.
|
---|
[821] | 4906 | */
|
---|
[2725] | 4907 | #if !ENABLE_HUSH_BASH_COMPAT
|
---|
| 4908 | /* only ${var/pattern/repl} (its pattern part) needs additional mode */
|
---|
| 4909 | #define encode_then_expand_string(str, process_bkslash, do_unbackslash) \
|
---|
| 4910 | encode_then_expand_string(str)
|
---|
| 4911 | #endif
|
---|
| 4912 | static char *encode_then_expand_string(const char *str, int process_bkslash, int do_unbackslash)
|
---|
[821] | 4913 | {
|
---|
[2725] | 4914 | char *exp_str;
|
---|
| 4915 | struct in_str input;
|
---|
| 4916 | o_string dest = NULL_O_STRING;
|
---|
| 4917 |
|
---|
| 4918 | if (!strchr(str, '$')
|
---|
| 4919 | && !strchr(str, '\\')
|
---|
| 4920 | #if ENABLE_HUSH_TICK
|
---|
| 4921 | && !strchr(str, '`')
|
---|
| 4922 | #endif
|
---|
| 4923 | ) {
|
---|
| 4924 | return NULL;
|
---|
[821] | 4925 | }
|
---|
[2725] | 4926 |
|
---|
| 4927 | /* We need to expand. Example:
|
---|
| 4928 | * echo $(($a + `echo 1`)) $((1 + $((2)) ))
|
---|
| 4929 | */
|
---|
| 4930 | setup_string_in_str(&input, str);
|
---|
| 4931 | encode_string(NULL, &dest, &input, EOF, process_bkslash);
|
---|
[3232] | 4932 | //TODO: error check (encode_string returns 0 on error)?
|
---|
[2725] | 4933 | //bb_error_msg("'%s' -> '%s'", str, dest.data);
|
---|
| 4934 | exp_str = expand_string_to_string(dest.data, /*unbackslash:*/ do_unbackslash);
|
---|
| 4935 | //bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
|
---|
| 4936 | o_free_unsafe(&dest);
|
---|
| 4937 | return exp_str;
|
---|
[821] | 4938 | }
|
---|
| 4939 |
|
---|
[2725] | 4940 | #if ENABLE_SH_MATH_SUPPORT
|
---|
| 4941 | static arith_t expand_and_evaluate_arith(const char *arg, const char **errmsg_p)
|
---|
[821] | 4942 | {
|
---|
[2725] | 4943 | arith_state_t math_state;
|
---|
| 4944 | arith_t res;
|
---|
| 4945 | char *exp_str;
|
---|
| 4946 |
|
---|
| 4947 | math_state.lookupvar = get_local_var_value;
|
---|
| 4948 | math_state.setvar = set_local_var_from_halves;
|
---|
| 4949 | //math_state.endofname = endofname;
|
---|
| 4950 | exp_str = encode_then_expand_string(arg, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
|
---|
| 4951 | res = arith(&math_state, exp_str ? exp_str : arg);
|
---|
| 4952 | free(exp_str);
|
---|
| 4953 | if (errmsg_p)
|
---|
| 4954 | *errmsg_p = math_state.errmsg;
|
---|
| 4955 | if (math_state.errmsg)
|
---|
| 4956 | die_if_script(math_state.errmsg);
|
---|
| 4957 | return res;
|
---|
[821] | 4958 | }
|
---|
[2725] | 4959 | #endif
|
---|
[821] | 4960 |
|
---|
[2725] | 4961 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
| 4962 | /* ${var/[/]pattern[/repl]} helpers */
|
---|
| 4963 | static char *strstr_pattern(char *val, const char *pattern, int *size)
|
---|
[821] | 4964 | {
|
---|
[2725] | 4965 | while (1) {
|
---|
| 4966 | char *end = scan_and_match(val, pattern, SCAN_MOVE_FROM_RIGHT + SCAN_MATCH_LEFT_HALF);
|
---|
| 4967 | debug_printf_varexp("val:'%s' pattern:'%s' end:'%s'\n", val, pattern, end);
|
---|
| 4968 | if (end) {
|
---|
| 4969 | *size = end - val;
|
---|
| 4970 | return val;
|
---|
[821] | 4971 | }
|
---|
[2725] | 4972 | if (*val == '\0')
|
---|
| 4973 | return NULL;
|
---|
| 4974 | /* Optimization: if "*pat" did not match the start of "string",
|
---|
| 4975 | * we know that "tring", "ring" etc will not match too:
|
---|
| 4976 | */
|
---|
| 4977 | if (pattern[0] == '*')
|
---|
| 4978 | return NULL;
|
---|
| 4979 | val++;
|
---|
[821] | 4980 | }
|
---|
| 4981 | }
|
---|
[2725] | 4982 | static char *replace_pattern(char *val, const char *pattern, const char *repl, char exp_op)
|
---|
| 4983 | {
|
---|
| 4984 | char *result = NULL;
|
---|
| 4985 | unsigned res_len = 0;
|
---|
| 4986 | unsigned repl_len = strlen(repl);
|
---|
[821] | 4987 |
|
---|
[2725] | 4988 | while (1) {
|
---|
| 4989 | int size;
|
---|
| 4990 | char *s = strstr_pattern(val, pattern, &size);
|
---|
| 4991 | if (!s)
|
---|
| 4992 | break;
|
---|
[1765] | 4993 |
|
---|
[2725] | 4994 | result = xrealloc(result, res_len + (s - val) + repl_len + 1);
|
---|
| 4995 | memcpy(result + res_len, val, s - val);
|
---|
| 4996 | res_len += s - val;
|
---|
| 4997 | strcpy(result + res_len, repl);
|
---|
| 4998 | res_len += repl_len;
|
---|
| 4999 | debug_printf_varexp("val:'%s' s:'%s' result:'%s'\n", val, s, result);
|
---|
| 5000 |
|
---|
| 5001 | val = s + size;
|
---|
| 5002 | if (exp_op == '/')
|
---|
| 5003 | break;
|
---|
[1765] | 5004 | }
|
---|
[2725] | 5005 | if (val[0] && result) {
|
---|
| 5006 | result = xrealloc(result, res_len + strlen(val) + 1);
|
---|
| 5007 | strcpy(result + res_len, val);
|
---|
| 5008 | debug_printf_varexp("val:'%s' result:'%s'\n", val, result);
|
---|
| 5009 | }
|
---|
| 5010 | debug_printf_varexp("result:'%s'\n", result);
|
---|
| 5011 | return result;
|
---|
[821] | 5012 | }
|
---|
[2725] | 5013 | #endif
|
---|
[821] | 5014 |
|
---|
[2725] | 5015 | /* Helper:
|
---|
| 5016 | * Handles <SPECIAL_VAR_SYMBOL>varname...<SPECIAL_VAR_SYMBOL> construct.
|
---|
| 5017 | */
|
---|
| 5018 | static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, char **pp)
|
---|
[821] | 5019 | {
|
---|
[2725] | 5020 | const char *val = NULL;
|
---|
| 5021 | char *to_be_freed = NULL;
|
---|
| 5022 | char *p = *pp;
|
---|
| 5023 | char *var;
|
---|
| 5024 | char first_char;
|
---|
| 5025 | char exp_op;
|
---|
| 5026 | char exp_save = exp_save; /* for compiler */
|
---|
| 5027 | char *exp_saveptr; /* points to expansion operator */
|
---|
| 5028 | char *exp_word = exp_word; /* for compiler */
|
---|
| 5029 | char arg0;
|
---|
[821] | 5030 |
|
---|
[2725] | 5031 | *p = '\0'; /* replace trailing SPECIAL_VAR_SYMBOL */
|
---|
| 5032 | var = arg;
|
---|
| 5033 | exp_saveptr = arg[1] ? strchr(VAR_ENCODED_SUBST_OPS, arg[1]) : NULL;
|
---|
| 5034 | arg0 = arg[0];
|
---|
| 5035 | first_char = arg[0] = arg0 & 0x7f;
|
---|
| 5036 | exp_op = 0;
|
---|
[821] | 5037 |
|
---|
[2725] | 5038 | if (first_char == '#' /* ${#... */
|
---|
| 5039 | && arg[1] && !exp_saveptr /* not ${#} and not ${#<op_char>...} */
|
---|
| 5040 | ) {
|
---|
| 5041 | /* It must be length operator: ${#var} */
|
---|
| 5042 | var++;
|
---|
| 5043 | exp_op = 'L';
|
---|
| 5044 | } else {
|
---|
| 5045 | /* Maybe handle parameter expansion */
|
---|
| 5046 | if (exp_saveptr /* if 2nd char is one of expansion operators */
|
---|
| 5047 | && strchr(NUMERIC_SPECVARS_STR, first_char) /* 1st char is special variable */
|
---|
| 5048 | ) {
|
---|
| 5049 | /* ${?:0}, ${#[:]%0} etc */
|
---|
| 5050 | exp_saveptr = var + 1;
|
---|
| 5051 | } else {
|
---|
| 5052 | /* ${?}, ${var}, ${var:0}, ${var[:]%0} etc */
|
---|
| 5053 | exp_saveptr = var+1 + strcspn(var+1, VAR_ENCODED_SUBST_OPS);
|
---|
| 5054 | }
|
---|
| 5055 | exp_op = exp_save = *exp_saveptr;
|
---|
| 5056 | if (exp_op) {
|
---|
| 5057 | exp_word = exp_saveptr + 1;
|
---|
| 5058 | if (exp_op == ':') {
|
---|
| 5059 | exp_op = *exp_word++;
|
---|
| 5060 | //TODO: try ${var:} and ${var:bogus} in non-bash config
|
---|
| 5061 | if (ENABLE_HUSH_BASH_COMPAT
|
---|
| 5062 | && (!exp_op || !strchr(MINUS_PLUS_EQUAL_QUESTION, exp_op))
|
---|
| 5063 | ) {
|
---|
| 5064 | /* oops... it's ${var:N[:M]}, not ${var:?xxx} or some such */
|
---|
| 5065 | exp_op = ':';
|
---|
| 5066 | exp_word--;
|
---|
| 5067 | }
|
---|
| 5068 | }
|
---|
| 5069 | *exp_saveptr = '\0';
|
---|
| 5070 | } /* else: it's not an expansion op, but bare ${var} */
|
---|
| 5071 | }
|
---|
| 5072 |
|
---|
| 5073 | /* Look up the variable in question */
|
---|
| 5074 | if (isdigit(var[0])) {
|
---|
| 5075 | /* parse_dollar should have vetted var for us */
|
---|
| 5076 | int n = xatoi_positive(var);
|
---|
| 5077 | if (n < G.global_argc)
|
---|
| 5078 | val = G.global_argv[n];
|
---|
| 5079 | /* else val remains NULL: $N with too big N */
|
---|
| 5080 | } else {
|
---|
| 5081 | switch (var[0]) {
|
---|
[1765] | 5082 | case '$': /* pid */
|
---|
[2725] | 5083 | val = utoa(G.root_pid);
|
---|
| 5084 | break;
|
---|
[1765] | 5085 | case '!': /* bg pid */
|
---|
[2725] | 5086 | val = G.last_bg_pid ? utoa(G.last_bg_pid) : "";
|
---|
| 5087 | break;
|
---|
[1765] | 5088 | case '?': /* exitcode */
|
---|
[2725] | 5089 | val = utoa(G.last_exitcode);
|
---|
| 5090 | break;
|
---|
[1765] | 5091 | case '#': /* argc */
|
---|
[2725] | 5092 | val = utoa(G.global_argc ? G.global_argc-1 : 0);
|
---|
[1765] | 5093 | break;
|
---|
[2725] | 5094 | default:
|
---|
| 5095 | val = get_local_var_value(var);
|
---|
| 5096 | }
|
---|
| 5097 | }
|
---|
| 5098 |
|
---|
| 5099 | /* Handle any expansions */
|
---|
| 5100 | if (exp_op == 'L') {
|
---|
[3621] | 5101 | reinit_unicode_for_hush();
|
---|
[2725] | 5102 | debug_printf_expand("expand: length(%s)=", val);
|
---|
[3621] | 5103 | val = utoa(val ? unicode_strlen(val) : 0);
|
---|
[2725] | 5104 | debug_printf_expand("%s\n", val);
|
---|
| 5105 | } else if (exp_op) {
|
---|
| 5106 | if (exp_op == '%' || exp_op == '#') {
|
---|
| 5107 | /* Standard-mandated substring removal ops:
|
---|
| 5108 | * ${parameter%word} - remove smallest suffix pattern
|
---|
| 5109 | * ${parameter%%word} - remove largest suffix pattern
|
---|
| 5110 | * ${parameter#word} - remove smallest prefix pattern
|
---|
| 5111 | * ${parameter##word} - remove largest prefix pattern
|
---|
| 5112 | *
|
---|
| 5113 | * Word is expanded to produce a glob pattern.
|
---|
| 5114 | * Then var's value is matched to it and matching part removed.
|
---|
| 5115 | */
|
---|
| 5116 | if (val && val[0]) {
|
---|
| 5117 | char *t;
|
---|
| 5118 | char *exp_exp_word;
|
---|
| 5119 | char *loc;
|
---|
| 5120 | unsigned scan_flags = pick_scan(exp_op, *exp_word);
|
---|
| 5121 | if (exp_op == *exp_word) /* ## or %% */
|
---|
| 5122 | exp_word++;
|
---|
| 5123 | exp_exp_word = encode_then_expand_string(exp_word, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
|
---|
| 5124 | if (exp_exp_word)
|
---|
| 5125 | exp_word = exp_exp_word;
|
---|
| 5126 | /* HACK ALERT. We depend here on the fact that
|
---|
| 5127 | * G.global_argv and results of utoa and get_local_var_value
|
---|
| 5128 | * are actually in writable memory:
|
---|
| 5129 | * scan_and_match momentarily stores NULs there. */
|
---|
| 5130 | t = (char*)val;
|
---|
| 5131 | loc = scan_and_match(t, exp_word, scan_flags);
|
---|
| 5132 | //bb_error_msg("op:%c str:'%s' pat:'%s' res:'%s'",
|
---|
| 5133 | // exp_op, t, exp_word, loc);
|
---|
| 5134 | free(exp_exp_word);
|
---|
| 5135 | if (loc) { /* match was found */
|
---|
| 5136 | if (scan_flags & SCAN_MATCH_LEFT_HALF) /* #[#] */
|
---|
| 5137 | val = loc; /* take right part */
|
---|
| 5138 | else /* %[%] */
|
---|
| 5139 | val = to_be_freed = xstrndup(val, loc - val); /* left */
|
---|
| 5140 | }
|
---|
[1765] | 5141 | }
|
---|
[2725] | 5142 | }
|
---|
| 5143 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
| 5144 | else if (exp_op == '/' || exp_op == '\\') {
|
---|
| 5145 | /* It's ${var/[/]pattern[/repl]} thing.
|
---|
| 5146 | * Note that in encoded form it has TWO parts:
|
---|
| 5147 | * var/pattern<SPECIAL_VAR_SYMBOL>repl<SPECIAL_VAR_SYMBOL>
|
---|
| 5148 | * and if // is used, it is encoded as \:
|
---|
| 5149 | * var\pattern<SPECIAL_VAR_SYMBOL>repl<SPECIAL_VAR_SYMBOL>
|
---|
| 5150 | */
|
---|
| 5151 | /* Empty variable always gives nothing: */
|
---|
| 5152 | // "v=''; echo ${v/*/w}" prints "", not "w"
|
---|
| 5153 | if (val && val[0]) {
|
---|
| 5154 | /* pattern uses non-standard expansion.
|
---|
| 5155 | * repl should be unbackslashed and globbed
|
---|
| 5156 | * by the usual expansion rules:
|
---|
| 5157 | * >az; >bz;
|
---|
| 5158 | * v='a bz'; echo "${v/a*z/a*z}" prints "a*z"
|
---|
| 5159 | * v='a bz'; echo "${v/a*z/\z}" prints "\z"
|
---|
| 5160 | * v='a bz'; echo ${v/a*z/a*z} prints "az"
|
---|
| 5161 | * v='a bz'; echo ${v/a*z/\z} prints "z"
|
---|
| 5162 | * (note that a*z _pattern_ is never globbed!)
|
---|
| 5163 | */
|
---|
| 5164 | char *pattern, *repl, *t;
|
---|
| 5165 | pattern = encode_then_expand_string(exp_word, /*process_bkslash:*/ 0, /*unbackslash:*/ 0);
|
---|
| 5166 | if (!pattern)
|
---|
| 5167 | pattern = xstrdup(exp_word);
|
---|
| 5168 | debug_printf_varexp("pattern:'%s'->'%s'\n", exp_word, pattern);
|
---|
| 5169 | *p++ = SPECIAL_VAR_SYMBOL;
|
---|
| 5170 | exp_word = p;
|
---|
| 5171 | p = strchr(p, SPECIAL_VAR_SYMBOL);
|
---|
| 5172 | *p = '\0';
|
---|
| 5173 | repl = encode_then_expand_string(exp_word, /*process_bkslash:*/ arg0 & 0x80, /*unbackslash:*/ 1);
|
---|
| 5174 | debug_printf_varexp("repl:'%s'->'%s'\n", exp_word, repl);
|
---|
| 5175 | /* HACK ALERT. We depend here on the fact that
|
---|
| 5176 | * G.global_argv and results of utoa and get_local_var_value
|
---|
| 5177 | * are actually in writable memory:
|
---|
| 5178 | * replace_pattern momentarily stores NULs there. */
|
---|
| 5179 | t = (char*)val;
|
---|
| 5180 | to_be_freed = replace_pattern(t,
|
---|
| 5181 | pattern,
|
---|
| 5182 | (repl ? repl : exp_word),
|
---|
| 5183 | exp_op);
|
---|
| 5184 | if (to_be_freed) /* at least one replace happened */
|
---|
| 5185 | val = to_be_freed;
|
---|
| 5186 | free(pattern);
|
---|
| 5187 | free(repl);
|
---|
| 5188 | }
|
---|
| 5189 | }
|
---|
| 5190 | #endif
|
---|
| 5191 | else if (exp_op == ':') {
|
---|
| 5192 | #if ENABLE_HUSH_BASH_COMPAT && ENABLE_SH_MATH_SUPPORT
|
---|
| 5193 | /* It's ${var:N[:M]} bashism.
|
---|
| 5194 | * Note that in encoded form it has TWO parts:
|
---|
| 5195 | * var:N<SPECIAL_VAR_SYMBOL>M<SPECIAL_VAR_SYMBOL>
|
---|
| 5196 | */
|
---|
| 5197 | arith_t beg, len;
|
---|
| 5198 | const char *errmsg;
|
---|
| 5199 |
|
---|
| 5200 | beg = expand_and_evaluate_arith(exp_word, &errmsg);
|
---|
| 5201 | if (errmsg)
|
---|
| 5202 | goto arith_err;
|
---|
| 5203 | debug_printf_varexp("beg:'%s'=%lld\n", exp_word, (long long)beg);
|
---|
| 5204 | *p++ = SPECIAL_VAR_SYMBOL;
|
---|
| 5205 | exp_word = p;
|
---|
| 5206 | p = strchr(p, SPECIAL_VAR_SYMBOL);
|
---|
[1765] | 5207 | *p = '\0';
|
---|
[2725] | 5208 | len = expand_and_evaluate_arith(exp_word, &errmsg);
|
---|
| 5209 | if (errmsg)
|
---|
| 5210 | goto arith_err;
|
---|
| 5211 | debug_printf_varexp("len:'%s'=%lld\n", exp_word, (long long)len);
|
---|
| 5212 | if (len >= 0) { /* bash compat: len < 0 is illegal */
|
---|
| 5213 | if (beg < 0) /* bash compat */
|
---|
| 5214 | beg = 0;
|
---|
| 5215 | debug_printf_varexp("from val:'%s'\n", val);
|
---|
| 5216 | if (len == 0 || !val || beg >= strlen(val)) {
|
---|
| 5217 | arith_err:
|
---|
| 5218 | val = NULL;
|
---|
| 5219 | } else {
|
---|
| 5220 | /* Paranoia. What if user entered 9999999999999
|
---|
| 5221 | * which fits in arith_t but not int? */
|
---|
| 5222 | if (len >= INT_MAX)
|
---|
| 5223 | len = INT_MAX;
|
---|
| 5224 | val = to_be_freed = xstrndup(val + beg, len);
|
---|
| 5225 | }
|
---|
| 5226 | debug_printf_varexp("val:'%s'\n", val);
|
---|
| 5227 | } else
|
---|
| 5228 | #endif
|
---|
| 5229 | {
|
---|
| 5230 | die_if_script("malformed ${%s:...}", var);
|
---|
[1765] | 5231 | val = NULL;
|
---|
[2725] | 5232 | }
|
---|
| 5233 | } else { /* one of "-=+?" */
|
---|
| 5234 | /* Standard-mandated substitution ops:
|
---|
| 5235 | * ${var?word} - indicate error if unset
|
---|
| 5236 | * If var is unset, word (or a message indicating it is unset
|
---|
| 5237 | * if word is null) is written to standard error
|
---|
| 5238 | * and the shell exits with a non-zero exit status.
|
---|
| 5239 | * Otherwise, the value of var is substituted.
|
---|
| 5240 | * ${var-word} - use default value
|
---|
| 5241 | * If var is unset, word is substituted.
|
---|
| 5242 | * ${var=word} - assign and use default value
|
---|
| 5243 | * If var is unset, word is assigned to var.
|
---|
| 5244 | * In all cases, final value of var is substituted.
|
---|
| 5245 | * ${var+word} - use alternative value
|
---|
| 5246 | * If var is unset, null is substituted.
|
---|
| 5247 | * Otherwise, word is substituted.
|
---|
| 5248 | *
|
---|
| 5249 | * Word is subjected to tilde expansion, parameter expansion,
|
---|
| 5250 | * command substitution, and arithmetic expansion.
|
---|
| 5251 | * If word is not needed, it is not expanded.
|
---|
| 5252 | *
|
---|
| 5253 | * Colon forms (${var:-word}, ${var:=word} etc) do the same,
|
---|
| 5254 | * but also treat null var as if it is unset.
|
---|
| 5255 | */
|
---|
| 5256 | int use_word = (!val || ((exp_save == ':') && !val[0]));
|
---|
| 5257 | if (exp_op == '+')
|
---|
| 5258 | use_word = !use_word;
|
---|
| 5259 | debug_printf_expand("expand: op:%c (null:%s) test:%i\n", exp_op,
|
---|
| 5260 | (exp_save == ':') ? "true" : "false", use_word);
|
---|
| 5261 | if (use_word) {
|
---|
| 5262 | to_be_freed = encode_then_expand_string(exp_word, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
|
---|
| 5263 | if (to_be_freed)
|
---|
| 5264 | exp_word = to_be_freed;
|
---|
| 5265 | if (exp_op == '?') {
|
---|
| 5266 | /* mimic bash message */
|
---|
| 5267 | die_if_script("%s: %s",
|
---|
| 5268 | var,
|
---|
| 5269 | exp_word[0] ? exp_word : "parameter null or not set"
|
---|
| 5270 | );
|
---|
| 5271 | //TODO: how interactive bash aborts expansion mid-command?
|
---|
| 5272 | } else {
|
---|
| 5273 | val = exp_word;
|
---|
| 5274 | }
|
---|
[1765] | 5275 |
|
---|
[2725] | 5276 | if (exp_op == '=') {
|
---|
| 5277 | /* ${var=[word]} or ${var:=[word]} */
|
---|
| 5278 | if (isdigit(var[0]) || var[0] == '#') {
|
---|
| 5279 | /* mimic bash message */
|
---|
| 5280 | die_if_script("$%s: cannot assign in this way", var);
|
---|
| 5281 | val = NULL;
|
---|
| 5282 | } else {
|
---|
| 5283 | char *new_var = xasprintf("%s=%s", var, val);
|
---|
| 5284 | set_local_var(new_var, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
---|
| 5285 | }
|
---|
| 5286 | }
|
---|
[1765] | 5287 | }
|
---|
[2725] | 5288 | } /* one of "-=+?" */
|
---|
[821] | 5289 |
|
---|
[2725] | 5290 | *exp_saveptr = exp_save;
|
---|
| 5291 | } /* if (exp_op) */
|
---|
[1765] | 5292 |
|
---|
[2725] | 5293 | arg[0] = arg0;
|
---|
| 5294 |
|
---|
| 5295 | *pp = p;
|
---|
| 5296 | *to_be_freed_pp = to_be_freed;
|
---|
| 5297 | return val;
|
---|
[1765] | 5298 | }
|
---|
[821] | 5299 |
|
---|
[1765] | 5300 | /* Expand all variable references in given string, adding words to list[]
|
---|
| 5301 | * at n, n+1,... positions. Return updated n (so that list[n] is next one
|
---|
| 5302 | * to be filled). This routine is extremely tricky: has to deal with
|
---|
| 5303 | * variables/parameters with whitespace, $* and $@, and constructs like
|
---|
| 5304 | * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
|
---|
[2725] | 5305 | static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg)
|
---|
[1765] | 5306 | {
|
---|
[2725] | 5307 | /* output->o_expflags & EXP_FLAG_SINGLEWORD (0x80) if we are in
|
---|
| 5308 | * expansion of right-hand side of assignment == 1-element expand.
|
---|
| 5309 | */
|
---|
| 5310 | char cant_be_null = 0; /* only bit 0x80 matters */
|
---|
[3232] | 5311 | int ended_in_ifs = 0; /* did last unquoted expansion end with IFS chars? */
|
---|
[1765] | 5312 | char *p;
|
---|
| 5313 |
|
---|
[2725] | 5314 | debug_printf_expand("expand_vars_to_list: arg:'%s' singleword:%x\n", arg,
|
---|
| 5315 | !!(output->o_expflags & EXP_FLAG_SINGLEWORD));
|
---|
| 5316 | debug_print_list("expand_vars_to_list", output, n);
|
---|
| 5317 | n = o_save_ptr(output, n);
|
---|
| 5318 | debug_print_list("expand_vars_to_list[0]", output, n);
|
---|
[1765] | 5319 |
|
---|
[2725] | 5320 | while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
|
---|
| 5321 | char first_ch;
|
---|
| 5322 | char *to_be_freed = NULL;
|
---|
| 5323 | const char *val = NULL;
|
---|
| 5324 | #if ENABLE_HUSH_TICK
|
---|
| 5325 | o_string subst_result = NULL_O_STRING;
|
---|
| 5326 | #endif
|
---|
| 5327 | #if ENABLE_SH_MATH_SUPPORT
|
---|
| 5328 | char arith_buf[sizeof(arith_t)*3 + 2];
|
---|
| 5329 | #endif
|
---|
[3232] | 5330 |
|
---|
| 5331 | if (ended_in_ifs) {
|
---|
| 5332 | o_addchr(output, '\0');
|
---|
| 5333 | n = o_save_ptr(output, n);
|
---|
| 5334 | ended_in_ifs = 0;
|
---|
| 5335 | }
|
---|
| 5336 |
|
---|
[2725] | 5337 | o_addblock(output, arg, p - arg);
|
---|
| 5338 | debug_print_list("expand_vars_to_list[1]", output, n);
|
---|
[1765] | 5339 | arg = ++p;
|
---|
| 5340 | p = strchr(p, SPECIAL_VAR_SYMBOL);
|
---|
| 5341 |
|
---|
[2725] | 5342 | /* Fetch special var name (if it is indeed one of them)
|
---|
| 5343 | * and quote bit, force the bit on if singleword expansion -
|
---|
| 5344 | * important for not getting v=$@ expand to many words. */
|
---|
| 5345 | first_ch = arg[0] | (output->o_expflags & EXP_FLAG_SINGLEWORD);
|
---|
| 5346 |
|
---|
| 5347 | /* Is this variable quoted and thus expansion can't be null?
|
---|
| 5348 | * "$@" is special. Even if quoted, it can still
|
---|
| 5349 | * expand to nothing (not even an empty string),
|
---|
| 5350 | * thus it is excluded. */
|
---|
| 5351 | if ((first_ch & 0x7f) != '@')
|
---|
| 5352 | cant_be_null |= first_ch;
|
---|
| 5353 |
|
---|
[1765] | 5354 | switch (first_ch & 0x7f) {
|
---|
| 5355 | /* Highest bit in first_ch indicates that var is double-quoted */
|
---|
| 5356 | case '*':
|
---|
[2725] | 5357 | case '@': {
|
---|
| 5358 | int i;
|
---|
| 5359 | if (!G.global_argv[1])
|
---|
| 5360 | break;
|
---|
[1765] | 5361 | i = 1;
|
---|
[2725] | 5362 | cant_be_null |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
|
---|
[1765] | 5363 | if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
|
---|
[2725] | 5364 | while (G.global_argv[i]) {
|
---|
[3232] | 5365 | n = expand_on_ifs(NULL, output, n, G.global_argv[i]);
|
---|
[2725] | 5366 | debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
|
---|
| 5367 | if (G.global_argv[i++][0] && G.global_argv[i]) {
|
---|
[1765] | 5368 | /* this argv[] is not empty and not last:
|
---|
| 5369 | * put terminating NUL, start new word */
|
---|
[2725] | 5370 | o_addchr(output, '\0');
|
---|
| 5371 | debug_print_list("expand_vars_to_list[2]", output, n);
|
---|
| 5372 | n = o_save_ptr(output, n);
|
---|
| 5373 | debug_print_list("expand_vars_to_list[3]", output, n);
|
---|
[1765] | 5374 | }
|
---|
| 5375 | }
|
---|
| 5376 | } else
|
---|
[2725] | 5377 | /* If EXP_FLAG_SINGLEWORD, we handle assignment 'a=....$@.....'
|
---|
| 5378 | * and in this case should treat it like '$*' - see 'else...' below */
|
---|
| 5379 | if (first_ch == ('@'|0x80) /* quoted $@ */
|
---|
| 5380 | && !(output->o_expflags & EXP_FLAG_SINGLEWORD) /* not v="$@" case */
|
---|
| 5381 | ) {
|
---|
[1765] | 5382 | while (1) {
|
---|
[2725] | 5383 | o_addQstr(output, G.global_argv[i]);
|
---|
| 5384 | if (++i >= G.global_argc)
|
---|
[1765] | 5385 | break;
|
---|
[2725] | 5386 | o_addchr(output, '\0');
|
---|
| 5387 | debug_print_list("expand_vars_to_list[4]", output, n);
|
---|
| 5388 | n = o_save_ptr(output, n);
|
---|
[1765] | 5389 | }
|
---|
[2725] | 5390 | } else { /* quoted $* (or v="$@" case): add as one word */
|
---|
[1765] | 5391 | while (1) {
|
---|
[2725] | 5392 | o_addQstr(output, G.global_argv[i]);
|
---|
| 5393 | if (!G.global_argv[++i])
|
---|
[1765] | 5394 | break;
|
---|
[2725] | 5395 | if (G.ifs[0])
|
---|
| 5396 | o_addchr(output, G.ifs[0]);
|
---|
[1765] | 5397 | }
|
---|
[3232] | 5398 | output->has_quoted_part = 1;
|
---|
[821] | 5399 | }
|
---|
[1765] | 5400 | break;
|
---|
[2725] | 5401 | }
|
---|
| 5402 | case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
|
---|
| 5403 | /* "Empty variable", used to make "" etc to not disappear */
|
---|
[3232] | 5404 | output->has_quoted_part = 1;
|
---|
[2725] | 5405 | arg++;
|
---|
| 5406 | cant_be_null = 0x80;
|
---|
| 5407 | break;
|
---|
| 5408 | #if ENABLE_HUSH_TICK
|
---|
| 5409 | case '`': /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */
|
---|
| 5410 | *p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
|
---|
| 5411 | arg++;
|
---|
| 5412 | /* Can't just stuff it into output o_string,
|
---|
| 5413 | * expanded result may need to be globbed
|
---|
| 5414 | * and $IFS-splitted */
|
---|
| 5415 | debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
|
---|
| 5416 | G.last_exitcode = process_command_subs(&subst_result, arg);
|
---|
| 5417 | debug_printf_subst("SUBST RES:%d '%s'\n", G.last_exitcode, subst_result.data);
|
---|
| 5418 | val = subst_result.data;
|
---|
| 5419 | goto store_val;
|
---|
| 5420 | #endif
|
---|
| 5421 | #if ENABLE_SH_MATH_SUPPORT
|
---|
| 5422 | case '+': { /* <SPECIAL_VAR_SYMBOL>+cmd<SPECIAL_VAR_SYMBOL> */
|
---|
| 5423 | arith_t res;
|
---|
| 5424 |
|
---|
| 5425 | arg++; /* skip '+' */
|
---|
| 5426 | *p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
|
---|
| 5427 | debug_printf_subst("ARITH '%s' first_ch %x\n", arg, first_ch);
|
---|
| 5428 | res = expand_and_evaluate_arith(arg, NULL);
|
---|
| 5429 | debug_printf_subst("ARITH RES '"ARITH_FMT"'\n", res);
|
---|
| 5430 | sprintf(arith_buf, ARITH_FMT, res);
|
---|
| 5431 | val = arith_buf;
|
---|
| 5432 | break;
|
---|
| 5433 | }
|
---|
| 5434 | #endif
|
---|
[1765] | 5435 | default:
|
---|
[2725] | 5436 | val = expand_one_var(&to_be_freed, arg, &p);
|
---|
| 5437 | IF_HUSH_TICK(store_val:)
|
---|
[1765] | 5438 | if (!(first_ch & 0x80)) { /* unquoted $VAR */
|
---|
[2725] | 5439 | debug_printf_expand("unquoted '%s', output->o_escape:%d\n", val,
|
---|
| 5440 | !!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
|
---|
| 5441 | if (val && val[0]) {
|
---|
[3232] | 5442 | n = expand_on_ifs(&ended_in_ifs, output, n, val);
|
---|
[1765] | 5443 | val = NULL;
|
---|
| 5444 | }
|
---|
[2725] | 5445 | } else { /* quoted $VAR, val will be appended below */
|
---|
[3232] | 5446 | output->has_quoted_part = 1;
|
---|
[2725] | 5447 | debug_printf_expand("quoted '%s', output->o_escape:%d\n", val,
|
---|
| 5448 | !!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
|
---|
| 5449 | }
|
---|
| 5450 | break;
|
---|
| 5451 | } /* switch (char after <SPECIAL_VAR_SYMBOL>) */
|
---|
| 5452 |
|
---|
| 5453 | if (val && val[0]) {
|
---|
| 5454 | o_addQstr(output, val);
|
---|
[821] | 5455 | }
|
---|
[2725] | 5456 | free(to_be_freed);
|
---|
| 5457 |
|
---|
| 5458 | /* Restore NULL'ed SPECIAL_VAR_SYMBOL.
|
---|
| 5459 | * Do the check to avoid writing to a const string. */
|
---|
| 5460 | if (*p != SPECIAL_VAR_SYMBOL)
|
---|
| 5461 | *p = SPECIAL_VAR_SYMBOL;
|
---|
| 5462 |
|
---|
| 5463 | #if ENABLE_HUSH_TICK
|
---|
| 5464 | o_free(&subst_result);
|
---|
| 5465 | #endif
|
---|
[1765] | 5466 | arg = ++p;
|
---|
[2725] | 5467 | } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
|
---|
| 5468 |
|
---|
| 5469 | if (arg[0]) {
|
---|
[3232] | 5470 | if (ended_in_ifs) {
|
---|
| 5471 | o_addchr(output, '\0');
|
---|
| 5472 | n = o_save_ptr(output, n);
|
---|
| 5473 | }
|
---|
[2725] | 5474 | debug_print_list("expand_vars_to_list[a]", output, n);
|
---|
| 5475 | /* this part is literal, and it was already pre-quoted
|
---|
| 5476 | * if needed (much earlier), do not use o_addQstr here! */
|
---|
| 5477 | o_addstr_with_NUL(output, arg);
|
---|
| 5478 | debug_print_list("expand_vars_to_list[b]", output, n);
|
---|
| 5479 | } else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
|
---|
| 5480 | && !(cant_be_null & 0x80) /* and all vars were not quoted. */
|
---|
| 5481 | ) {
|
---|
| 5482 | n--;
|
---|
| 5483 | /* allow to reuse list[n] later without re-growth */
|
---|
| 5484 | output->has_empty_slot = 1;
|
---|
| 5485 | } else {
|
---|
| 5486 | o_addchr(output, '\0');
|
---|
[821] | 5487 | }
|
---|
| 5488 |
|
---|
[1765] | 5489 | return n;
|
---|
| 5490 | }
|
---|
| 5491 |
|
---|
[2725] | 5492 | static char **expand_variables(char **argv, unsigned expflags)
|
---|
[1765] | 5493 | {
|
---|
| 5494 | int n;
|
---|
[2725] | 5495 | char **list;
|
---|
| 5496 | o_string output = NULL_O_STRING;
|
---|
[1765] | 5497 |
|
---|
[2725] | 5498 | output.o_expflags = expflags;
|
---|
| 5499 |
|
---|
| 5500 | n = 0;
|
---|
| 5501 | while (*argv) {
|
---|
| 5502 | n = expand_vars_to_list(&output, n, *argv);
|
---|
| 5503 | argv++;
|
---|
[821] | 5504 | }
|
---|
[2725] | 5505 | debug_print_list("expand_variables", &output, n);
|
---|
[1765] | 5506 |
|
---|
[2725] | 5507 | /* output.data (malloced in one block) gets returned in "list" */
|
---|
| 5508 | list = o_finalize_list(&output, n);
|
---|
| 5509 | debug_print_strings("expand_variables[1]", list);
|
---|
[1765] | 5510 | return list;
|
---|
[821] | 5511 | }
|
---|
| 5512 |
|
---|
[1765] | 5513 | static char **expand_strvec_to_strvec(char **argv)
|
---|
[821] | 5514 | {
|
---|
[2725] | 5515 | return expand_variables(argv, EXP_FLAG_GLOB | EXP_FLAG_ESC_GLOB_CHARS);
|
---|
[1765] | 5516 | }
|
---|
[821] | 5517 |
|
---|
[2725] | 5518 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
| 5519 | static char **expand_strvec_to_strvec_singleword_noglob(char **argv)
|
---|
[1765] | 5520 | {
|
---|
[2725] | 5521 | return expand_variables(argv, EXP_FLAG_SINGLEWORD);
|
---|
| 5522 | }
|
---|
| 5523 | #endif
|
---|
| 5524 |
|
---|
| 5525 | /* Used for expansion of right hand of assignments,
|
---|
| 5526 | * $((...)), heredocs, variable espansion parts.
|
---|
| 5527 | *
|
---|
| 5528 | * NB: should NOT do globbing!
|
---|
| 5529 | * "export v=/bin/c*; env | grep ^v=" outputs "v=/bin/c*"
|
---|
| 5530 | */
|
---|
| 5531 | static char *expand_string_to_string(const char *str, int do_unbackslash)
|
---|
| 5532 | {
|
---|
| 5533 | #if !ENABLE_HUSH_BASH_COMPAT
|
---|
| 5534 | const int do_unbackslash = 1;
|
---|
| 5535 | #endif
|
---|
[1765] | 5536 | char *argv[2], **list;
|
---|
| 5537 |
|
---|
[2725] | 5538 | debug_printf_expand("string_to_string<='%s'\n", str);
|
---|
| 5539 | /* This is generally an optimization, but it also
|
---|
| 5540 | * handles "", which otherwise trips over !list[0] check below.
|
---|
| 5541 | * (is this ever happens that we actually get str="" here?)
|
---|
| 5542 | */
|
---|
| 5543 | if (!strchr(str, SPECIAL_VAR_SYMBOL) && !strchr(str, '\\')) {
|
---|
| 5544 | //TODO: Can use on strings with \ too, just unbackslash() them?
|
---|
| 5545 | debug_printf_expand("string_to_string(fast)=>'%s'\n", str);
|
---|
| 5546 | return xstrdup(str);
|
---|
| 5547 | }
|
---|
| 5548 |
|
---|
[1765] | 5549 | argv[0] = (char*)str;
|
---|
| 5550 | argv[1] = NULL;
|
---|
[2725] | 5551 | list = expand_variables(argv, do_unbackslash
|
---|
| 5552 | ? EXP_FLAG_ESC_GLOB_CHARS | EXP_FLAG_SINGLEWORD
|
---|
| 5553 | : EXP_FLAG_SINGLEWORD
|
---|
| 5554 | );
|
---|
| 5555 | if (HUSH_DEBUG)
|
---|
[1765] | 5556 | if (!list[0] || list[1])
|
---|
| 5557 | bb_error_msg_and_die("BUG in varexp2");
|
---|
| 5558 | /* actually, just move string 2*sizeof(char*) bytes back */
|
---|
[2725] | 5559 | overlapping_strcpy((char*)list, list[0]);
|
---|
| 5560 | if (do_unbackslash)
|
---|
| 5561 | unbackslash((char*)list);
|
---|
| 5562 | debug_printf_expand("string_to_string=>'%s'\n", (char*)list);
|
---|
[1765] | 5563 | return (char*)list;
|
---|
| 5564 | }
|
---|
| 5565 |
|
---|
[2725] | 5566 | /* Used for "eval" builtin */
|
---|
[1765] | 5567 | static char* expand_strvec_to_string(char **argv)
|
---|
| 5568 | {
|
---|
| 5569 | char **list;
|
---|
| 5570 |
|
---|
[2725] | 5571 | list = expand_variables(argv, EXP_FLAG_SINGLEWORD);
|
---|
[1765] | 5572 | /* Convert all NULs to spaces */
|
---|
| 5573 | if (list[0]) {
|
---|
| 5574 | int n = 1;
|
---|
| 5575 | while (list[n]) {
|
---|
[2725] | 5576 | if (HUSH_DEBUG)
|
---|
[1765] | 5577 | if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
|
---|
| 5578 | bb_error_msg_and_die("BUG in varexp3");
|
---|
[2725] | 5579 | /* bash uses ' ' regardless of $IFS contents */
|
---|
| 5580 | list[n][-1] = ' ';
|
---|
[1765] | 5581 | n++;
|
---|
| 5582 | }
|
---|
| 5583 | }
|
---|
[2725] | 5584 | overlapping_strcpy((char*)list, list[0]);
|
---|
[1765] | 5585 | debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
|
---|
| 5586 | return (char*)list;
|
---|
| 5587 | }
|
---|
| 5588 |
|
---|
[2725] | 5589 | static char **expand_assignments(char **argv, int count)
|
---|
[1765] | 5590 | {
|
---|
[2725] | 5591 | int i;
|
---|
| 5592 | char **p;
|
---|
[1765] | 5593 |
|
---|
[2725] | 5594 | G.expanded_assignments = p = NULL;
|
---|
| 5595 | /* Expand assignments into one string each */
|
---|
| 5596 | for (i = 0; i < count; i++) {
|
---|
| 5597 | G.expanded_assignments = p = add_string_to_strings(p, expand_string_to_string(argv[i], /*unbackslash:*/ 1));
|
---|
[1765] | 5598 | }
|
---|
[2725] | 5599 | G.expanded_assignments = NULL;
|
---|
| 5600 | return p;
|
---|
[1765] | 5601 | }
|
---|
| 5602 |
|
---|
[2725] | 5603 |
|
---|
[3232] | 5604 | static void switch_off_special_sigs(unsigned mask)
|
---|
| 5605 | {
|
---|
| 5606 | unsigned sig = 0;
|
---|
| 5607 | while ((mask >>= 1) != 0) {
|
---|
| 5608 | sig++;
|
---|
| 5609 | if (!(mask & 1))
|
---|
| 5610 | continue;
|
---|
| 5611 | if (G.traps) {
|
---|
| 5612 | if (G.traps[sig] && !G.traps[sig][0])
|
---|
| 5613 | /* trap is '', has to remain SIG_IGN */
|
---|
| 5614 | continue;
|
---|
| 5615 | free(G.traps[sig]);
|
---|
| 5616 | G.traps[sig] = NULL;
|
---|
| 5617 | }
|
---|
| 5618 | /* We are here only if no trap or trap was not '' */
|
---|
| 5619 | install_sighandler(sig, SIG_DFL);
|
---|
| 5620 | }
|
---|
| 5621 | }
|
---|
| 5622 |
|
---|
[2725] | 5623 | #if BB_MMU
|
---|
| 5624 | /* never called */
|
---|
| 5625 | void re_execute_shell(char ***to_free, const char *s,
|
---|
| 5626 | char *g_argv0, char **g_argv,
|
---|
| 5627 | char **builtin_argv) NORETURN;
|
---|
| 5628 |
|
---|
| 5629 | static void reset_traps_to_defaults(void)
|
---|
[1765] | 5630 | {
|
---|
[2725] | 5631 | /* This function is always called in a child shell
|
---|
| 5632 | * after fork (not vfork, NOMMU doesn't use this function).
|
---|
| 5633 | */
|
---|
| 5634 | unsigned sig;
|
---|
| 5635 | unsigned mask;
|
---|
| 5636 |
|
---|
| 5637 | /* Child shells are not interactive.
|
---|
| 5638 | * SIGTTIN/SIGTTOU/SIGTSTP should not have special handling.
|
---|
| 5639 | * Testcase: (while :; do :; done) + ^Z should background.
|
---|
| 5640 | * Same goes for SIGTERM, SIGHUP, SIGINT.
|
---|
| 5641 | */
|
---|
[3232] | 5642 | mask = (G.special_sig_mask & SPECIAL_INTERACTIVE_SIGS) | G_fatal_sig_mask;
|
---|
| 5643 | if (!G.traps && !mask)
|
---|
| 5644 | return; /* already no traps and no special sigs */
|
---|
[2725] | 5645 |
|
---|
[3232] | 5646 | /* Switch off special sigs */
|
---|
| 5647 | switch_off_special_sigs(mask);
|
---|
| 5648 | #if ENABLE_HUSH_JOB
|
---|
| 5649 | G_fatal_sig_mask = 0;
|
---|
| 5650 | #endif
|
---|
| 5651 | G.special_sig_mask &= ~SPECIAL_INTERACTIVE_SIGS;
|
---|
| 5652 | /* SIGQUIT,SIGCHLD and maybe SPECIAL_JOBSTOP_SIGS
|
---|
| 5653 | * remain set in G.special_sig_mask */
|
---|
[2725] | 5654 |
|
---|
[3232] | 5655 | if (!G.traps)
|
---|
| 5656 | return;
|
---|
| 5657 |
|
---|
| 5658 | /* Reset all sigs to default except ones with empty traps */
|
---|
| 5659 | for (sig = 0; sig < NSIG; sig++) {
|
---|
| 5660 | if (!G.traps[sig])
|
---|
| 5661 | continue; /* no trap: nothing to do */
|
---|
| 5662 | if (!G.traps[sig][0])
|
---|
| 5663 | continue; /* empty trap: has to remain SIG_IGN */
|
---|
| 5664 | /* sig has non-empty trap, reset it: */
|
---|
[2725] | 5665 | free(G.traps[sig]);
|
---|
| 5666 | G.traps[sig] = NULL;
|
---|
[3232] | 5667 | /* There is no signal for trap 0 (EXIT) */
|
---|
[2725] | 5668 | if (sig == 0)
|
---|
| 5669 | continue;
|
---|
[3232] | 5670 | install_sighandler(sig, pick_sighandler(sig));
|
---|
[2725] | 5671 | }
|
---|
| 5672 | }
|
---|
| 5673 |
|
---|
| 5674 | #else /* !BB_MMU */
|
---|
| 5675 |
|
---|
| 5676 | static void re_execute_shell(char ***to_free, const char *s,
|
---|
| 5677 | char *g_argv0, char **g_argv,
|
---|
| 5678 | char **builtin_argv) NORETURN;
|
---|
| 5679 | static void re_execute_shell(char ***to_free, const char *s,
|
---|
| 5680 | char *g_argv0, char **g_argv,
|
---|
| 5681 | char **builtin_argv)
|
---|
| 5682 | {
|
---|
| 5683 | # define NOMMU_HACK_FMT ("-$%x:%x:%x:%x:%x:%llx" IF_HUSH_LOOPS(":%x"))
|
---|
| 5684 | /* delims + 2 * (number of bytes in printed hex numbers) */
|
---|
| 5685 | char param_buf[sizeof(NOMMU_HACK_FMT) + 2 * (sizeof(int)*6 + sizeof(long long)*1)];
|
---|
| 5686 | char *heredoc_argv[4];
|
---|
[1765] | 5687 | struct variable *cur;
|
---|
[2725] | 5688 | # if ENABLE_HUSH_FUNCTIONS
|
---|
| 5689 | struct function *funcp;
|
---|
| 5690 | # endif
|
---|
| 5691 | char **argv, **pp;
|
---|
| 5692 | unsigned cnt;
|
---|
| 5693 | unsigned long long empty_trap_mask;
|
---|
[1765] | 5694 |
|
---|
[2725] | 5695 | if (!g_argv0) { /* heredoc */
|
---|
| 5696 | argv = heredoc_argv;
|
---|
| 5697 | argv[0] = (char *) G.argv0_for_re_execing;
|
---|
| 5698 | argv[1] = (char *) "-<";
|
---|
| 5699 | argv[2] = (char *) s;
|
---|
| 5700 | argv[3] = NULL;
|
---|
| 5701 | pp = &argv[3]; /* used as pointer to empty environment */
|
---|
| 5702 | goto do_exec;
|
---|
[1765] | 5703 | }
|
---|
| 5704 |
|
---|
[2725] | 5705 | cnt = 0;
|
---|
| 5706 | pp = builtin_argv;
|
---|
| 5707 | if (pp) while (*pp++)
|
---|
| 5708 | cnt++;
|
---|
| 5709 |
|
---|
| 5710 | empty_trap_mask = 0;
|
---|
| 5711 | if (G.traps) {
|
---|
| 5712 | int sig;
|
---|
| 5713 | for (sig = 1; sig < NSIG; sig++) {
|
---|
| 5714 | if (G.traps[sig] && !G.traps[sig][0])
|
---|
| 5715 | empty_trap_mask |= 1LL << sig;
|
---|
| 5716 | }
|
---|
| 5717 | }
|
---|
| 5718 |
|
---|
| 5719 | sprintf(param_buf, NOMMU_HACK_FMT
|
---|
| 5720 | , (unsigned) G.root_pid
|
---|
| 5721 | , (unsigned) G.root_ppid
|
---|
| 5722 | , (unsigned) G.last_bg_pid
|
---|
| 5723 | , (unsigned) G.last_exitcode
|
---|
| 5724 | , cnt
|
---|
| 5725 | , empty_trap_mask
|
---|
| 5726 | IF_HUSH_LOOPS(, G.depth_of_loop)
|
---|
| 5727 | );
|
---|
| 5728 | # undef NOMMU_HACK_FMT
|
---|
| 5729 | /* 1:hush 2:-$<pid>:<pid>:<exitcode>:<etc...> <vars...> <funcs...>
|
---|
| 5730 | * 3:-c 4:<cmd> 5:<arg0> <argN...> 6:NULL
|
---|
| 5731 | */
|
---|
| 5732 | cnt += 6;
|
---|
| 5733 | for (cur = G.top_var; cur; cur = cur->next) {
|
---|
| 5734 | if (!cur->flg_export || cur->flg_read_only)
|
---|
| 5735 | cnt += 2;
|
---|
| 5736 | }
|
---|
| 5737 | # if ENABLE_HUSH_FUNCTIONS
|
---|
| 5738 | for (funcp = G.top_func; funcp; funcp = funcp->next)
|
---|
| 5739 | cnt += 3;
|
---|
| 5740 | # endif
|
---|
| 5741 | pp = g_argv;
|
---|
| 5742 | while (*pp++)
|
---|
| 5743 | cnt++;
|
---|
| 5744 | *to_free = argv = pp = xzalloc(sizeof(argv[0]) * cnt);
|
---|
| 5745 | *pp++ = (char *) G.argv0_for_re_execing;
|
---|
| 5746 | *pp++ = param_buf;
|
---|
| 5747 | for (cur = G.top_var; cur; cur = cur->next) {
|
---|
| 5748 | if (strcmp(cur->varstr, hush_version_str) == 0)
|
---|
[1765] | 5749 | continue;
|
---|
| 5750 | if (cur->flg_read_only) {
|
---|
[2725] | 5751 | *pp++ = (char *) "-R";
|
---|
| 5752 | *pp++ = cur->varstr;
|
---|
| 5753 | } else if (!cur->flg_export) {
|
---|
| 5754 | *pp++ = (char *) "-V";
|
---|
| 5755 | *pp++ = cur->varstr;
|
---|
[1765] | 5756 | }
|
---|
| 5757 | }
|
---|
[2725] | 5758 | # if ENABLE_HUSH_FUNCTIONS
|
---|
| 5759 | for (funcp = G.top_func; funcp; funcp = funcp->next) {
|
---|
| 5760 | *pp++ = (char *) "-F";
|
---|
| 5761 | *pp++ = funcp->name;
|
---|
| 5762 | *pp++ = funcp->body_as_string;
|
---|
| 5763 | }
|
---|
| 5764 | # endif
|
---|
| 5765 | /* We can pass activated traps here. Say, -Tnn:trap_string
|
---|
| 5766 | *
|
---|
| 5767 | * However, POSIX says that subshells reset signals with traps
|
---|
| 5768 | * to SIG_DFL.
|
---|
| 5769 | * I tested bash-3.2 and it not only does that with true subshells
|
---|
| 5770 | * of the form ( list ), but with any forked children shells.
|
---|
| 5771 | * I set trap "echo W" WINCH; and then tried:
|
---|
| 5772 | *
|
---|
| 5773 | * { echo 1; sleep 20; echo 2; } &
|
---|
| 5774 | * while true; do echo 1; sleep 20; echo 2; break; done &
|
---|
| 5775 | * true | { echo 1; sleep 20; echo 2; } | cat
|
---|
| 5776 | *
|
---|
| 5777 | * In all these cases sending SIGWINCH to the child shell
|
---|
| 5778 | * did not run the trap. If I add trap "echo V" WINCH;
|
---|
| 5779 | * _inside_ group (just before echo 1), it works.
|
---|
| 5780 | *
|
---|
| 5781 | * I conclude it means we don't need to pass active traps here.
|
---|
| 5782 | */
|
---|
| 5783 | *pp++ = (char *) "-c";
|
---|
| 5784 | *pp++ = (char *) s;
|
---|
| 5785 | if (builtin_argv) {
|
---|
| 5786 | while (*++builtin_argv)
|
---|
| 5787 | *pp++ = *builtin_argv;
|
---|
| 5788 | *pp++ = (char *) "";
|
---|
| 5789 | }
|
---|
| 5790 | *pp++ = g_argv0;
|
---|
| 5791 | while (*g_argv)
|
---|
| 5792 | *pp++ = *g_argv++;
|
---|
| 5793 | /* *pp = NULL; - is already there */
|
---|
| 5794 | pp = environ;
|
---|
[1765] | 5795 |
|
---|
[2725] | 5796 | do_exec:
|
---|
| 5797 | debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s);
|
---|
[3232] | 5798 | /* Don't propagate SIG_IGN to the child */
|
---|
| 5799 | if (SPECIAL_JOBSTOP_SIGS != 0)
|
---|
| 5800 | switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
|
---|
[2725] | 5801 | execve(bb_busybox_exec_path, argv, pp);
|
---|
| 5802 | /* Fallback. Useful for init=/bin/hush usage etc */
|
---|
| 5803 | if (argv[0][0] == '/')
|
---|
| 5804 | execve(argv[0], argv, pp);
|
---|
| 5805 | xfunc_error_retval = 127;
|
---|
| 5806 | bb_error_msg_and_die("can't re-execute the shell");
|
---|
[1765] | 5807 | }
|
---|
[2725] | 5808 | #endif /* !BB_MMU */
|
---|
[1765] | 5809 |
|
---|
[2725] | 5810 |
|
---|
| 5811 | static int run_and_free_list(struct pipe *pi);
|
---|
| 5812 |
|
---|
| 5813 | /* Executing from string: eval, sh -c '...'
|
---|
| 5814 | * or from file: /etc/profile, . file, sh <script>, sh (intereactive)
|
---|
| 5815 | * end_trigger controls how often we stop parsing
|
---|
| 5816 | * NUL: parse all, execute, return
|
---|
| 5817 | * ';': parse till ';' or newline, execute, repeat till EOF
|
---|
| 5818 | */
|
---|
| 5819 | static void parse_and_run_stream(struct in_str *inp, int end_trigger)
|
---|
[1765] | 5820 | {
|
---|
[2725] | 5821 | /* Why we need empty flag?
|
---|
| 5822 | * An obscure corner case "false; ``; echo $?":
|
---|
| 5823 | * empty command in `` should still set $? to 0.
|
---|
| 5824 | * But we can't just set $? to 0 at the start,
|
---|
| 5825 | * this breaks "false; echo `echo $?`" case.
|
---|
| 5826 | */
|
---|
| 5827 | bool empty = 1;
|
---|
| 5828 | while (1) {
|
---|
| 5829 | struct pipe *pipe_list;
|
---|
[1765] | 5830 |
|
---|
[3232] | 5831 | #if ENABLE_HUSH_INTERACTIVE
|
---|
| 5832 | if (end_trigger == ';')
|
---|
| 5833 | inp->promptmode = 0; /* PS1 */
|
---|
| 5834 | #endif
|
---|
[2725] | 5835 | pipe_list = parse_stream(NULL, inp, end_trigger);
|
---|
[3232] | 5836 | if (!pipe_list || pipe_list == ERR_PTR) { /* EOF/error */
|
---|
| 5837 | /* If we are in "big" script
|
---|
| 5838 | * (not in `cmd` or something similar)...
|
---|
| 5839 | */
|
---|
| 5840 | if (pipe_list == ERR_PTR && end_trigger == ';') {
|
---|
| 5841 | /* Discard cached input (rest of line) */
|
---|
| 5842 | int ch = inp->last_char;
|
---|
| 5843 | while (ch != EOF && ch != '\n') {
|
---|
| 5844 | //bb_error_msg("Discarded:'%c'", ch);
|
---|
| 5845 | ch = i_getch(inp);
|
---|
| 5846 | }
|
---|
| 5847 | /* Force prompt */
|
---|
| 5848 | inp->p = NULL;
|
---|
| 5849 | /* This stream isn't empty */
|
---|
| 5850 | empty = 0;
|
---|
| 5851 | continue;
|
---|
| 5852 | }
|
---|
| 5853 | if (!pipe_list && empty)
|
---|
[2725] | 5854 | G.last_exitcode = 0;
|
---|
| 5855 | break;
|
---|
[821] | 5856 | }
|
---|
[2725] | 5857 | debug_print_tree(pipe_list, 0);
|
---|
| 5858 | debug_printf_exec("parse_and_run_stream: run_and_free_list\n");
|
---|
| 5859 | run_and_free_list(pipe_list);
|
---|
| 5860 | empty = 0;
|
---|
[3232] | 5861 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 5862 | if (G.flag_return_in_progress == 1)
|
---|
| 5863 | break;
|
---|
| 5864 | #endif
|
---|
[821] | 5865 | }
|
---|
| 5866 | }
|
---|
| 5867 |
|
---|
[2725] | 5868 | static void parse_and_run_string(const char *s)
|
---|
[821] | 5869 | {
|
---|
[2725] | 5870 | struct in_str input;
|
---|
| 5871 | setup_string_in_str(&input, s);
|
---|
| 5872 | parse_and_run_stream(&input, '\0');
|
---|
[821] | 5873 | }
|
---|
| 5874 |
|
---|
[2725] | 5875 | static void parse_and_run_file(FILE *f)
|
---|
[821] | 5876 | {
|
---|
[2725] | 5877 | struct in_str input;
|
---|
| 5878 | setup_file_in_str(&input, f);
|
---|
| 5879 | parse_and_run_stream(&input, ';');
|
---|
| 5880 | }
|
---|
[821] | 5881 |
|
---|
[2725] | 5882 | #if ENABLE_HUSH_TICK
|
---|
| 5883 | static FILE *generate_stream_from_string(const char *s, pid_t *pid_p)
|
---|
| 5884 | {
|
---|
| 5885 | pid_t pid;
|
---|
| 5886 | int channel[2];
|
---|
| 5887 | # if !BB_MMU
|
---|
| 5888 | char **to_free = NULL;
|
---|
| 5889 | # endif
|
---|
| 5890 |
|
---|
| 5891 | xpipe(channel);
|
---|
| 5892 | pid = BB_MMU ? xfork() : xvfork();
|
---|
| 5893 | if (pid == 0) { /* child */
|
---|
| 5894 | disable_restore_tty_pgrp_on_exit();
|
---|
| 5895 | /* Process substitution is not considered to be usual
|
---|
| 5896 | * 'command execution'.
|
---|
| 5897 | * SUSv3 says ctrl-Z should be ignored, ctrl-C should not.
|
---|
| 5898 | */
|
---|
| 5899 | bb_signals(0
|
---|
| 5900 | + (1 << SIGTSTP)
|
---|
| 5901 | + (1 << SIGTTIN)
|
---|
| 5902 | + (1 << SIGTTOU)
|
---|
| 5903 | , SIG_IGN);
|
---|
| 5904 | CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
|
---|
| 5905 | close(channel[0]); /* NB: close _first_, then move fd! */
|
---|
| 5906 | xmove_fd(channel[1], 1);
|
---|
| 5907 | /* Prevent it from trying to handle ctrl-z etc */
|
---|
| 5908 | IF_HUSH_JOB(G.run_list_level = 1;)
|
---|
| 5909 | /* Awful hack for `trap` or $(trap).
|
---|
| 5910 | *
|
---|
| 5911 | * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
|
---|
| 5912 | * contains an example where "trap" is executed in a subshell:
|
---|
| 5913 | *
|
---|
| 5914 | * save_traps=$(trap)
|
---|
| 5915 | * ...
|
---|
| 5916 | * eval "$save_traps"
|
---|
| 5917 | *
|
---|
| 5918 | * Standard does not say that "trap" in subshell shall print
|
---|
| 5919 | * parent shell's traps. It only says that its output
|
---|
| 5920 | * must have suitable form, but then, in the above example
|
---|
| 5921 | * (which is not supposed to be normative), it implies that.
|
---|
| 5922 | *
|
---|
| 5923 | * bash (and probably other shell) does implement it
|
---|
| 5924 | * (traps are reset to defaults, but "trap" still shows them),
|
---|
| 5925 | * but as a result, "trap" logic is hopelessly messed up:
|
---|
| 5926 | *
|
---|
| 5927 | * # trap
|
---|
| 5928 | * trap -- 'echo Ho' SIGWINCH <--- we have a handler
|
---|
| 5929 | * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
|
---|
| 5930 | * # true | trap <--- trap is in subshell - no output (ditto)
|
---|
| 5931 | * # echo `true | trap` <--- in subshell - output (but traps are reset!)
|
---|
| 5932 | * trap -- 'echo Ho' SIGWINCH
|
---|
| 5933 | * # echo `(trap)` <--- in subshell in subshell - output
|
---|
| 5934 | * trap -- 'echo Ho' SIGWINCH
|
---|
| 5935 | * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
|
---|
| 5936 | * trap -- 'echo Ho' SIGWINCH
|
---|
| 5937 | *
|
---|
| 5938 | * The rules when to forget and when to not forget traps
|
---|
| 5939 | * get really complex and nonsensical.
|
---|
| 5940 | *
|
---|
| 5941 | * Our solution: ONLY bare $(trap) or `trap` is special.
|
---|
| 5942 | */
|
---|
| 5943 | s = skip_whitespace(s);
|
---|
[3621] | 5944 | if (is_prefixed_with(s, "trap")
|
---|
[2725] | 5945 | && skip_whitespace(s + 4)[0] == '\0'
|
---|
| 5946 | ) {
|
---|
| 5947 | static const char *const argv[] = { NULL, NULL };
|
---|
| 5948 | builtin_trap((char**)argv);
|
---|
[3621] | 5949 | fflush_all(); /* important */
|
---|
| 5950 | _exit(0);
|
---|
[2725] | 5951 | }
|
---|
| 5952 | # if BB_MMU
|
---|
| 5953 | reset_traps_to_defaults();
|
---|
| 5954 | parse_and_run_string(s);
|
---|
| 5955 | _exit(G.last_exitcode);
|
---|
| 5956 | # else
|
---|
| 5957 | /* We re-execute after vfork on NOMMU. This makes this script safe:
|
---|
| 5958 | * yes "0123456789012345678901234567890" | dd bs=32 count=64k >BIG
|
---|
| 5959 | * huge=`cat BIG` # was blocking here forever
|
---|
| 5960 | * echo OK
|
---|
| 5961 | */
|
---|
| 5962 | re_execute_shell(&to_free,
|
---|
| 5963 | s,
|
---|
| 5964 | G.global_argv[0],
|
---|
| 5965 | G.global_argv + 1,
|
---|
| 5966 | NULL);
|
---|
| 5967 | # endif
|
---|
[821] | 5968 | }
|
---|
| 5969 |
|
---|
[2725] | 5970 | /* parent */
|
---|
| 5971 | *pid_p = pid;
|
---|
| 5972 | # if ENABLE_HUSH_FAST
|
---|
| 5973 | G.count_SIGCHLD++;
|
---|
| 5974 | //bb_error_msg("[%d] fork in generate_stream_from_string:"
|
---|
| 5975 | // " G.count_SIGCHLD:%d G.handled_SIGCHLD:%d",
|
---|
| 5976 | // getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
---|
| 5977 | # endif
|
---|
| 5978 | enable_restore_tty_pgrp_on_exit();
|
---|
| 5979 | # if !BB_MMU
|
---|
| 5980 | free(to_free);
|
---|
| 5981 | # endif
|
---|
| 5982 | close(channel[1]);
|
---|
| 5983 | close_on_exec_on(channel[0]);
|
---|
| 5984 | return xfdopen_for_read(channel[0]);
|
---|
| 5985 | }
|
---|
[821] | 5986 |
|
---|
[2725] | 5987 | /* Return code is exit status of the process that is run. */
|
---|
| 5988 | static int process_command_subs(o_string *dest, const char *s)
|
---|
| 5989 | {
|
---|
| 5990 | FILE *fp;
|
---|
| 5991 | struct in_str pipe_str;
|
---|
| 5992 | pid_t pid;
|
---|
| 5993 | int status, ch, eol_cnt;
|
---|
[821] | 5994 |
|
---|
[2725] | 5995 | fp = generate_stream_from_string(s, &pid);
|
---|
| 5996 |
|
---|
| 5997 | /* Now send results of command back into original context */
|
---|
| 5998 | setup_file_in_str(&pipe_str, fp);
|
---|
| 5999 | eol_cnt = 0;
|
---|
| 6000 | while ((ch = i_getch(&pipe_str)) != EOF) {
|
---|
| 6001 | if (ch == '\n') {
|
---|
| 6002 | eol_cnt++;
|
---|
| 6003 | continue;
|
---|
| 6004 | }
|
---|
| 6005 | while (eol_cnt) {
|
---|
| 6006 | o_addchr(dest, '\n');
|
---|
| 6007 | eol_cnt--;
|
---|
| 6008 | }
|
---|
| 6009 | o_addQchr(dest, ch);
|
---|
[821] | 6010 | }
|
---|
| 6011 |
|
---|
[2725] | 6012 | debug_printf("done reading from `cmd` pipe, closing it\n");
|
---|
| 6013 | fclose(fp);
|
---|
| 6014 | /* We need to extract exitcode. Test case
|
---|
| 6015 | * "true; echo `sleep 1; false` $?"
|
---|
| 6016 | * should print 1 */
|
---|
| 6017 | safe_waitpid(pid, &status, 0);
|
---|
| 6018 | debug_printf("child exited. returning its exitcode:%d\n", WEXITSTATUS(status));
|
---|
| 6019 | return WEXITSTATUS(status);
|
---|
[821] | 6020 | }
|
---|
[2725] | 6021 | #endif /* ENABLE_HUSH_TICK */
|
---|
[821] | 6022 |
|
---|
| 6023 |
|
---|
[2725] | 6024 | static void setup_heredoc(struct redir_struct *redir)
|
---|
[821] | 6025 | {
|
---|
[2725] | 6026 | struct fd_pair pair;
|
---|
| 6027 | pid_t pid;
|
---|
| 6028 | int len, written;
|
---|
| 6029 | /* the _body_ of heredoc (misleading field name) */
|
---|
| 6030 | const char *heredoc = redir->rd_filename;
|
---|
| 6031 | char *expanded;
|
---|
| 6032 | #if !BB_MMU
|
---|
| 6033 | char **to_free;
|
---|
[1765] | 6034 | #endif
|
---|
[2725] | 6035 |
|
---|
| 6036 | expanded = NULL;
|
---|
| 6037 | if (!(redir->rd_dup & HEREDOC_QUOTED)) {
|
---|
| 6038 | expanded = encode_then_expand_string(heredoc, /*process_bkslash:*/ 1, /*unbackslash:*/ 1);
|
---|
| 6039 | if (expanded)
|
---|
| 6040 | heredoc = expanded;
|
---|
| 6041 | }
|
---|
| 6042 | len = strlen(heredoc);
|
---|
| 6043 |
|
---|
| 6044 | close(redir->rd_fd); /* often saves dup2+close in xmove_fd */
|
---|
| 6045 | xpiped_pair(pair);
|
---|
| 6046 | xmove_fd(pair.rd, redir->rd_fd);
|
---|
| 6047 |
|
---|
| 6048 | /* Try writing without forking. Newer kernels have
|
---|
| 6049 | * dynamically growing pipes. Must use non-blocking write! */
|
---|
| 6050 | ndelay_on(pair.wr);
|
---|
| 6051 | while (1) {
|
---|
| 6052 | written = write(pair.wr, heredoc, len);
|
---|
| 6053 | if (written <= 0)
|
---|
| 6054 | break;
|
---|
| 6055 | len -= written;
|
---|
| 6056 | if (len == 0) {
|
---|
| 6057 | close(pair.wr);
|
---|
| 6058 | free(expanded);
|
---|
| 6059 | return;
|
---|
| 6060 | }
|
---|
| 6061 | heredoc += written;
|
---|
| 6062 | }
|
---|
| 6063 | ndelay_off(pair.wr);
|
---|
| 6064 |
|
---|
| 6065 | /* Okay, pipe buffer was not big enough */
|
---|
| 6066 | /* Note: we must not create a stray child (bastard? :)
|
---|
| 6067 | * for the unsuspecting parent process. Child creates a grandchild
|
---|
| 6068 | * and exits before parent execs the process which consumes heredoc
|
---|
| 6069 | * (that exec happens after we return from this function) */
|
---|
| 6070 | #if !BB_MMU
|
---|
| 6071 | to_free = NULL;
|
---|
[1765] | 6072 | #endif
|
---|
[2725] | 6073 | pid = xvfork();
|
---|
| 6074 | if (pid == 0) {
|
---|
| 6075 | /* child */
|
---|
| 6076 | disable_restore_tty_pgrp_on_exit();
|
---|
| 6077 | pid = BB_MMU ? xfork() : xvfork();
|
---|
| 6078 | if (pid != 0)
|
---|
| 6079 | _exit(0);
|
---|
| 6080 | /* grandchild */
|
---|
| 6081 | close(redir->rd_fd); /* read side of the pipe */
|
---|
| 6082 | #if BB_MMU
|
---|
| 6083 | full_write(pair.wr, heredoc, len); /* may loop or block */
|
---|
| 6084 | _exit(0);
|
---|
| 6085 | #else
|
---|
| 6086 | /* Delegate blocking writes to another process */
|
---|
| 6087 | xmove_fd(pair.wr, STDOUT_FILENO);
|
---|
| 6088 | re_execute_shell(&to_free, heredoc, NULL, NULL, NULL);
|
---|
| 6089 | #endif
|
---|
| 6090 | }
|
---|
| 6091 | /* parent */
|
---|
| 6092 | #if ENABLE_HUSH_FAST
|
---|
| 6093 | G.count_SIGCHLD++;
|
---|
| 6094 | //bb_error_msg("[%d] fork in setup_heredoc: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
---|
| 6095 | #endif
|
---|
| 6096 | enable_restore_tty_pgrp_on_exit();
|
---|
| 6097 | #if !BB_MMU
|
---|
| 6098 | free(to_free);
|
---|
| 6099 | #endif
|
---|
| 6100 | close(pair.wr);
|
---|
| 6101 | free(expanded);
|
---|
| 6102 | wait(NULL); /* wait till child has died */
|
---|
| 6103 | }
|
---|
[1765] | 6104 |
|
---|
[2725] | 6105 | /* squirrel != NULL means we squirrel away copies of stdin, stdout,
|
---|
| 6106 | * and stderr if they are redirected. */
|
---|
| 6107 | static int setup_redirects(struct command *prog, int squirrel[])
|
---|
| 6108 | {
|
---|
| 6109 | int openfd, mode;
|
---|
| 6110 | struct redir_struct *redir;
|
---|
[1765] | 6111 |
|
---|
[2725] | 6112 | for (redir = prog->redirects; redir; redir = redir->next) {
|
---|
| 6113 | if (redir->rd_type == REDIRECT_HEREDOC2) {
|
---|
| 6114 | /* rd_fd<<HERE case */
|
---|
| 6115 | if (squirrel && redir->rd_fd < 3
|
---|
| 6116 | && squirrel[redir->rd_fd] < 0
|
---|
| 6117 | ) {
|
---|
| 6118 | squirrel[redir->rd_fd] = dup(redir->rd_fd);
|
---|
| 6119 | }
|
---|
| 6120 | /* for REDIRECT_HEREDOC2, rd_filename holds _contents_
|
---|
| 6121 | * of the heredoc */
|
---|
| 6122 | debug_printf_parse("set heredoc '%s'\n",
|
---|
| 6123 | redir->rd_filename);
|
---|
| 6124 | setup_heredoc(redir);
|
---|
[1765] | 6125 | continue;
|
---|
[2725] | 6126 | }
|
---|
| 6127 |
|
---|
| 6128 | if (redir->rd_dup == REDIRFD_TO_FILE) {
|
---|
| 6129 | /* rd_fd<*>file case (<*> is <,>,>>,<>) */
|
---|
| 6130 | char *p;
|
---|
| 6131 | if (redir->rd_filename == NULL) {
|
---|
| 6132 | /* Something went wrong in the parse.
|
---|
| 6133 | * Pretend it didn't happen */
|
---|
| 6134 | bb_error_msg("bug in redirect parse");
|
---|
| 6135 | continue;
|
---|
| 6136 | }
|
---|
| 6137 | mode = redir_table[redir->rd_type].mode;
|
---|
| 6138 | p = expand_string_to_string(redir->rd_filename, /*unbackslash:*/ 1);
|
---|
| 6139 | openfd = open_or_warn(p, mode);
|
---|
| 6140 | free(p);
|
---|
| 6141 | if (openfd < 0) {
|
---|
| 6142 | /* this could get lost if stderr has been redirected, but
|
---|
| 6143 | * bash and ash both lose it as well (though zsh doesn't!) */
|
---|
| 6144 | //what the above comment tries to say?
|
---|
[821] | 6145 | return 1;
|
---|
| 6146 | }
|
---|
[2725] | 6147 | } else {
|
---|
| 6148 | /* rd_fd<*>rd_dup or rd_fd<*>- cases */
|
---|
| 6149 | openfd = redir->rd_dup;
|
---|
[821] | 6150 | }
|
---|
[2725] | 6151 |
|
---|
| 6152 | if (openfd != redir->rd_fd) {
|
---|
| 6153 | if (squirrel && redir->rd_fd < 3
|
---|
| 6154 | && squirrel[redir->rd_fd] < 0
|
---|
| 6155 | ) {
|
---|
| 6156 | squirrel[redir->rd_fd] = dup(redir->rd_fd);
|
---|
| 6157 | }
|
---|
| 6158 | if (openfd == REDIRFD_CLOSE) {
|
---|
| 6159 | /* "n>-" means "close me" */
|
---|
| 6160 | close(redir->rd_fd);
|
---|
| 6161 | } else {
|
---|
| 6162 | xdup2(openfd, redir->rd_fd);
|
---|
| 6163 | if (redir->rd_dup == REDIRFD_TO_FILE)
|
---|
| 6164 | close(openfd);
|
---|
| 6165 | }
|
---|
[1765] | 6166 | }
|
---|
[821] | 6167 | }
|
---|
| 6168 | return 0;
|
---|
| 6169 | }
|
---|
| 6170 |
|
---|
[2725] | 6171 | static void restore_redirects(int squirrel[])
|
---|
[821] | 6172 | {
|
---|
[2725] | 6173 | int i, fd;
|
---|
| 6174 | for (i = 0; i < 3; i++) {
|
---|
| 6175 | fd = squirrel[i];
|
---|
| 6176 | if (fd != -1) {
|
---|
| 6177 | /* We simply die on error */
|
---|
| 6178 | xmove_fd(fd, i);
|
---|
| 6179 | }
|
---|
| 6180 | }
|
---|
| 6181 | }
|
---|
[821] | 6182 |
|
---|
[2725] | 6183 | static char *find_in_path(const char *arg)
|
---|
| 6184 | {
|
---|
| 6185 | char *ret = NULL;
|
---|
| 6186 | const char *PATH = get_local_var_value("PATH");
|
---|
| 6187 |
|
---|
| 6188 | if (!PATH)
|
---|
| 6189 | return NULL;
|
---|
| 6190 |
|
---|
| 6191 | while (1) {
|
---|
| 6192 | const char *end = strchrnul(PATH, ':');
|
---|
| 6193 | int sz = end - PATH; /* must be int! */
|
---|
| 6194 |
|
---|
| 6195 | free(ret);
|
---|
| 6196 | if (sz != 0) {
|
---|
| 6197 | ret = xasprintf("%.*s/%s", sz, PATH, arg);
|
---|
| 6198 | } else {
|
---|
| 6199 | /* We have xxx::yyyy in $PATH,
|
---|
| 6200 | * it means "use current dir" */
|
---|
| 6201 | ret = xstrdup(arg);
|
---|
[821] | 6202 | }
|
---|
[2725] | 6203 | if (access(ret, F_OK) == 0)
|
---|
| 6204 | break;
|
---|
| 6205 |
|
---|
| 6206 | if (*end == '\0') {
|
---|
| 6207 | free(ret);
|
---|
| 6208 | return NULL;
|
---|
[821] | 6209 | }
|
---|
[2725] | 6210 | PATH = end + 1;
|
---|
[821] | 6211 | }
|
---|
[2725] | 6212 |
|
---|
| 6213 | return ret;
|
---|
| 6214 | }
|
---|
| 6215 |
|
---|
| 6216 | static const struct built_in_command *find_builtin_helper(const char *name,
|
---|
| 6217 | const struct built_in_command *x,
|
---|
| 6218 | const struct built_in_command *end)
|
---|
| 6219 | {
|
---|
| 6220 | while (x != end) {
|
---|
| 6221 | if (strcmp(name, x->b_cmd) != 0) {
|
---|
| 6222 | x++;
|
---|
| 6223 | continue;
|
---|
| 6224 | }
|
---|
| 6225 | debug_printf_exec("found builtin '%s'\n", name);
|
---|
| 6226 | return x;
|
---|
[1765] | 6227 | }
|
---|
[2725] | 6228 | return NULL;
|
---|
| 6229 | }
|
---|
| 6230 | static const struct built_in_command *find_builtin1(const char *name)
|
---|
| 6231 | {
|
---|
| 6232 | return find_builtin_helper(name, bltins1, &bltins1[ARRAY_SIZE(bltins1)]);
|
---|
| 6233 | }
|
---|
| 6234 | static const struct built_in_command *find_builtin(const char *name)
|
---|
| 6235 | {
|
---|
| 6236 | const struct built_in_command *x = find_builtin1(name);
|
---|
| 6237 | if (x)
|
---|
| 6238 | return x;
|
---|
| 6239 | return find_builtin_helper(name, bltins2, &bltins2[ARRAY_SIZE(bltins2)]);
|
---|
| 6240 | }
|
---|
[821] | 6241 |
|
---|
[2725] | 6242 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 6243 | static struct function **find_function_slot(const char *name)
|
---|
| 6244 | {
|
---|
| 6245 | struct function **funcpp = &G.top_func;
|
---|
| 6246 | while (*funcpp) {
|
---|
| 6247 | if (strcmp(name, (*funcpp)->name) == 0) {
|
---|
| 6248 | break;
|
---|
[821] | 6249 | }
|
---|
[2725] | 6250 | funcpp = &(*funcpp)->next;
|
---|
[821] | 6251 | }
|
---|
[2725] | 6252 | return funcpp;
|
---|
[821] | 6253 | }
|
---|
| 6254 |
|
---|
[2725] | 6255 | static const struct function *find_function(const char *name)
|
---|
[821] | 6256 | {
|
---|
[2725] | 6257 | const struct function *funcp = *find_function_slot(name);
|
---|
| 6258 | if (funcp)
|
---|
| 6259 | debug_printf_exec("found function '%s'\n", name);
|
---|
| 6260 | return funcp;
|
---|
| 6261 | }
|
---|
[821] | 6262 |
|
---|
[2725] | 6263 | /* Note: takes ownership on name ptr */
|
---|
| 6264 | static struct function *new_function(char *name)
|
---|
| 6265 | {
|
---|
| 6266 | struct function **funcpp = find_function_slot(name);
|
---|
| 6267 | struct function *funcp = *funcpp;
|
---|
| 6268 |
|
---|
| 6269 | if (funcp != NULL) {
|
---|
| 6270 | struct command *cmd = funcp->parent_cmd;
|
---|
| 6271 | debug_printf_exec("func %p parent_cmd %p\n", funcp, cmd);
|
---|
| 6272 | if (!cmd) {
|
---|
| 6273 | debug_printf_exec("freeing & replacing function '%s'\n", funcp->name);
|
---|
| 6274 | free(funcp->name);
|
---|
| 6275 | /* Note: if !funcp->body, do not free body_as_string!
|
---|
| 6276 | * This is a special case of "-F name body" function:
|
---|
| 6277 | * body_as_string was not malloced! */
|
---|
| 6278 | if (funcp->body) {
|
---|
| 6279 | free_pipe_list(funcp->body);
|
---|
| 6280 | # if !BB_MMU
|
---|
| 6281 | free(funcp->body_as_string);
|
---|
| 6282 | # endif
|
---|
| 6283 | }
|
---|
| 6284 | } else {
|
---|
| 6285 | debug_printf_exec("reinserting in tree & replacing function '%s'\n", funcp->name);
|
---|
| 6286 | cmd->argv[0] = funcp->name;
|
---|
| 6287 | cmd->group = funcp->body;
|
---|
| 6288 | # if !BB_MMU
|
---|
| 6289 | cmd->group_as_string = funcp->body_as_string;
|
---|
| 6290 | # endif
|
---|
[1765] | 6291 | }
|
---|
[821] | 6292 | } else {
|
---|
[2725] | 6293 | debug_printf_exec("remembering new function '%s'\n", name);
|
---|
| 6294 | funcp = *funcpp = xzalloc(sizeof(*funcp));
|
---|
| 6295 | /*funcp->next = NULL;*/
|
---|
[821] | 6296 | }
|
---|
[1765] | 6297 |
|
---|
[2725] | 6298 | funcp->name = name;
|
---|
| 6299 | return funcp;
|
---|
| 6300 | }
|
---|
[821] | 6301 |
|
---|
[2725] | 6302 | static void unset_func(const char *name)
|
---|
| 6303 | {
|
---|
| 6304 | struct function **funcpp = find_function_slot(name);
|
---|
| 6305 | struct function *funcp = *funcpp;
|
---|
[821] | 6306 |
|
---|
[2725] | 6307 | if (funcp != NULL) {
|
---|
| 6308 | debug_printf_exec("freeing function '%s'\n", funcp->name);
|
---|
| 6309 | *funcpp = funcp->next;
|
---|
| 6310 | /* funcp is unlinked now, deleting it.
|
---|
| 6311 | * Note: if !funcp->body, the function was created by
|
---|
| 6312 | * "-F name body", do not free ->body_as_string
|
---|
| 6313 | * and ->name as they were not malloced. */
|
---|
| 6314 | if (funcp->body) {
|
---|
| 6315 | free_pipe_list(funcp->body);
|
---|
| 6316 | free(funcp->name);
|
---|
| 6317 | # if !BB_MMU
|
---|
| 6318 | free(funcp->body_as_string);
|
---|
| 6319 | # endif
|
---|
| 6320 | }
|
---|
| 6321 | free(funcp);
|
---|
| 6322 | }
|
---|
[821] | 6323 | }
|
---|
| 6324 |
|
---|
[2725] | 6325 | # if BB_MMU
|
---|
| 6326 | #define exec_function(to_free, funcp, argv) \
|
---|
| 6327 | exec_function(funcp, argv)
|
---|
| 6328 | # endif
|
---|
| 6329 | static void exec_function(char ***to_free,
|
---|
| 6330 | const struct function *funcp,
|
---|
| 6331 | char **argv) NORETURN;
|
---|
| 6332 | static void exec_function(char ***to_free,
|
---|
| 6333 | const struct function *funcp,
|
---|
| 6334 | char **argv)
|
---|
[821] | 6335 | {
|
---|
[2725] | 6336 | # if BB_MMU
|
---|
| 6337 | int n = 1;
|
---|
[1765] | 6338 |
|
---|
[2725] | 6339 | argv[0] = G.global_argv[0];
|
---|
| 6340 | G.global_argv = argv;
|
---|
| 6341 | while (*++argv)
|
---|
| 6342 | n++;
|
---|
| 6343 | G.global_argc = n;
|
---|
| 6344 | /* On MMU, funcp->body is always non-NULL */
|
---|
| 6345 | n = run_list(funcp->body);
|
---|
| 6346 | fflush_all();
|
---|
| 6347 | _exit(n);
|
---|
| 6348 | # else
|
---|
| 6349 | re_execute_shell(to_free,
|
---|
| 6350 | funcp->body_as_string,
|
---|
| 6351 | G.global_argv[0],
|
---|
| 6352 | argv + 1,
|
---|
| 6353 | NULL);
|
---|
| 6354 | # endif
|
---|
[821] | 6355 | }
|
---|
| 6356 |
|
---|
[2725] | 6357 | static int run_function(const struct function *funcp, char **argv)
|
---|
[821] | 6358 | {
|
---|
[2725] | 6359 | int rc;
|
---|
| 6360 | save_arg_t sv;
|
---|
| 6361 | smallint sv_flg;
|
---|
[821] | 6362 |
|
---|
[2725] | 6363 | save_and_replace_G_args(&sv, argv);
|
---|
| 6364 |
|
---|
| 6365 | /* "we are in function, ok to use return" */
|
---|
| 6366 | sv_flg = G.flag_return_in_progress;
|
---|
| 6367 | G.flag_return_in_progress = -1;
|
---|
| 6368 | # if ENABLE_HUSH_LOCAL
|
---|
| 6369 | G.func_nest_level++;
|
---|
| 6370 | # endif
|
---|
| 6371 |
|
---|
| 6372 | /* On MMU, funcp->body is always non-NULL */
|
---|
| 6373 | # if !BB_MMU
|
---|
| 6374 | if (!funcp->body) {
|
---|
| 6375 | /* Function defined by -F */
|
---|
| 6376 | parse_and_run_string(funcp->body_as_string);
|
---|
| 6377 | rc = G.last_exitcode;
|
---|
| 6378 | } else
|
---|
| 6379 | # endif
|
---|
| 6380 | {
|
---|
| 6381 | rc = run_list(funcp->body);
|
---|
[821] | 6382 | }
|
---|
[2725] | 6383 |
|
---|
| 6384 | # if ENABLE_HUSH_LOCAL
|
---|
| 6385 | {
|
---|
| 6386 | struct variable *var;
|
---|
| 6387 | struct variable **var_pp;
|
---|
| 6388 |
|
---|
| 6389 | var_pp = &G.top_var;
|
---|
| 6390 | while ((var = *var_pp) != NULL) {
|
---|
| 6391 | if (var->func_nest_level < G.func_nest_level) {
|
---|
| 6392 | var_pp = &var->next;
|
---|
| 6393 | continue;
|
---|
| 6394 | }
|
---|
| 6395 | /* Unexport */
|
---|
| 6396 | if (var->flg_export)
|
---|
| 6397 | bb_unsetenv(var->varstr);
|
---|
| 6398 | /* Remove from global list */
|
---|
| 6399 | *var_pp = var->next;
|
---|
| 6400 | /* Free */
|
---|
| 6401 | if (!var->max_len)
|
---|
| 6402 | free(var->varstr);
|
---|
| 6403 | free(var);
|
---|
| 6404 | }
|
---|
| 6405 | G.func_nest_level--;
|
---|
[821] | 6406 | }
|
---|
[2725] | 6407 | # endif
|
---|
| 6408 | G.flag_return_in_progress = sv_flg;
|
---|
[821] | 6409 |
|
---|
[2725] | 6410 | restore_G_args(&sv, argv);
|
---|
| 6411 |
|
---|
| 6412 | return rc;
|
---|
[821] | 6413 | }
|
---|
[2725] | 6414 | #endif /* ENABLE_HUSH_FUNCTIONS */
|
---|
[821] | 6415 |
|
---|
[2725] | 6416 |
|
---|
| 6417 | #if BB_MMU
|
---|
| 6418 | #define exec_builtin(to_free, x, argv) \
|
---|
| 6419 | exec_builtin(x, argv)
|
---|
| 6420 | #else
|
---|
| 6421 | #define exec_builtin(to_free, x, argv) \
|
---|
| 6422 | exec_builtin(to_free, argv)
|
---|
| 6423 | #endif
|
---|
| 6424 | static void exec_builtin(char ***to_free,
|
---|
| 6425 | const struct built_in_command *x,
|
---|
| 6426 | char **argv) NORETURN;
|
---|
| 6427 | static void exec_builtin(char ***to_free,
|
---|
| 6428 | const struct built_in_command *x,
|
---|
| 6429 | char **argv)
|
---|
[821] | 6430 | {
|
---|
[2725] | 6431 | #if BB_MMU
|
---|
[3232] | 6432 | int rcode;
|
---|
[2725] | 6433 | fflush_all();
|
---|
[3232] | 6434 | rcode = x->b_function(argv);
|
---|
| 6435 | fflush_all();
|
---|
[2725] | 6436 | _exit(rcode);
|
---|
| 6437 | #else
|
---|
[3232] | 6438 | fflush_all();
|
---|
[2725] | 6439 | /* On NOMMU, we must never block!
|
---|
| 6440 | * Example: { sleep 99 | read line; } & echo Ok
|
---|
| 6441 | */
|
---|
| 6442 | re_execute_shell(to_free,
|
---|
| 6443 | argv[0],
|
---|
| 6444 | G.global_argv[0],
|
---|
| 6445 | G.global_argv + 1,
|
---|
| 6446 | argv);
|
---|
| 6447 | #endif
|
---|
| 6448 | }
|
---|
[821] | 6449 |
|
---|
[2725] | 6450 |
|
---|
| 6451 | static void execvp_or_die(char **argv) NORETURN;
|
---|
| 6452 | static void execvp_or_die(char **argv)
|
---|
| 6453 | {
|
---|
| 6454 | debug_printf_exec("execing '%s'\n", argv[0]);
|
---|
[3232] | 6455 | /* Don't propagate SIG_IGN to the child */
|
---|
| 6456 | if (SPECIAL_JOBSTOP_SIGS != 0)
|
---|
| 6457 | switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
|
---|
[2725] | 6458 | execvp(argv[0], argv);
|
---|
| 6459 | bb_perror_msg("can't execute '%s'", argv[0]);
|
---|
| 6460 | _exit(127); /* bash compat */
|
---|
| 6461 | }
|
---|
| 6462 |
|
---|
| 6463 | #if ENABLE_HUSH_MODE_X
|
---|
| 6464 | static void dump_cmd_in_x_mode(char **argv)
|
---|
| 6465 | {
|
---|
| 6466 | if (G_x_mode && argv) {
|
---|
| 6467 | /* We want to output the line in one write op */
|
---|
| 6468 | char *buf, *p;
|
---|
| 6469 | int len;
|
---|
| 6470 | int n;
|
---|
| 6471 |
|
---|
| 6472 | len = 3;
|
---|
| 6473 | n = 0;
|
---|
| 6474 | while (argv[n])
|
---|
| 6475 | len += strlen(argv[n++]) + 1;
|
---|
| 6476 | buf = xmalloc(len);
|
---|
| 6477 | buf[0] = '+';
|
---|
| 6478 | p = buf + 1;
|
---|
| 6479 | n = 0;
|
---|
| 6480 | while (argv[n])
|
---|
| 6481 | p += sprintf(p, " %s", argv[n++]);
|
---|
| 6482 | *p++ = '\n';
|
---|
| 6483 | *p = '\0';
|
---|
| 6484 | fputs(buf, stderr);
|
---|
| 6485 | free(buf);
|
---|
[821] | 6486 | }
|
---|
| 6487 | }
|
---|
[2725] | 6488 | #else
|
---|
| 6489 | # define dump_cmd_in_x_mode(argv) ((void)0)
|
---|
| 6490 | #endif
|
---|
[821] | 6491 |
|
---|
[2725] | 6492 | #if BB_MMU
|
---|
| 6493 | #define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
|
---|
| 6494 | pseudo_exec_argv(argv, assignment_cnt, argv_expanded)
|
---|
| 6495 | #define pseudo_exec(nommu_save, command, argv_expanded) \
|
---|
| 6496 | pseudo_exec(command, argv_expanded)
|
---|
| 6497 | #endif
|
---|
| 6498 |
|
---|
| 6499 | /* Called after [v]fork() in run_pipe, or from builtin_exec.
|
---|
| 6500 | * Never returns.
|
---|
| 6501 | * Don't exit() here. If you don't exec, use _exit instead.
|
---|
| 6502 | * The at_exit handlers apparently confuse the calling process,
|
---|
[3621] | 6503 | * in particular stdin handling. Not sure why? -- because of vfork! (vda)
|
---|
| 6504 | */
|
---|
[2725] | 6505 | static void pseudo_exec_argv(nommu_save_t *nommu_save,
|
---|
| 6506 | char **argv, int assignment_cnt,
|
---|
| 6507 | char **argv_expanded) NORETURN;
|
---|
| 6508 | static NOINLINE void pseudo_exec_argv(nommu_save_t *nommu_save,
|
---|
| 6509 | char **argv, int assignment_cnt,
|
---|
| 6510 | char **argv_expanded)
|
---|
[821] | 6511 | {
|
---|
[2725] | 6512 | char **new_env;
|
---|
[1765] | 6513 |
|
---|
[2725] | 6514 | new_env = expand_assignments(argv, assignment_cnt);
|
---|
| 6515 | dump_cmd_in_x_mode(new_env);
|
---|
| 6516 |
|
---|
| 6517 | if (!argv[assignment_cnt]) {
|
---|
| 6518 | /* Case when we are here: ... | var=val | ...
|
---|
| 6519 | * (note that we do not exit early, i.e., do not optimize out
|
---|
| 6520 | * expand_assignments(): think about ... | var=`sleep 1` | ...
|
---|
| 6521 | */
|
---|
| 6522 | free_strings(new_env);
|
---|
| 6523 | _exit(EXIT_SUCCESS);
|
---|
| 6524 | }
|
---|
| 6525 |
|
---|
[1765] | 6526 | #if BB_MMU
|
---|
[2725] | 6527 | set_vars_and_save_old(new_env);
|
---|
| 6528 | free(new_env); /* optional */
|
---|
| 6529 | /* we can also destroy set_vars_and_save_old's return value,
|
---|
| 6530 | * to save memory */
|
---|
[821] | 6531 | #else
|
---|
[2725] | 6532 | nommu_save->new_env = new_env;
|
---|
| 6533 | nommu_save->old_vars = set_vars_and_save_old(new_env);
|
---|
[821] | 6534 | #endif
|
---|
[2725] | 6535 |
|
---|
| 6536 | if (argv_expanded) {
|
---|
| 6537 | argv = argv_expanded;
|
---|
| 6538 | } else {
|
---|
| 6539 | argv = expand_strvec_to_strvec(argv + assignment_cnt);
|
---|
| 6540 | #if !BB_MMU
|
---|
| 6541 | nommu_save->argv = argv;
|
---|
| 6542 | #endif
|
---|
| 6543 | }
|
---|
| 6544 | dump_cmd_in_x_mode(argv);
|
---|
| 6545 |
|
---|
| 6546 | #if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
|
---|
| 6547 | if (strchr(argv[0], '/') != NULL)
|
---|
| 6548 | goto skip;
|
---|
| 6549 | #endif
|
---|
| 6550 |
|
---|
| 6551 | /* Check if the command matches any of the builtins.
|
---|
| 6552 | * Depending on context, this might be redundant. But it's
|
---|
| 6553 | * easier to waste a few CPU cycles than it is to figure out
|
---|
| 6554 | * if this is one of those cases.
|
---|
| 6555 | */
|
---|
| 6556 | {
|
---|
| 6557 | /* On NOMMU, it is more expensive to re-execute shell
|
---|
| 6558 | * just in order to run echo or test builtin.
|
---|
| 6559 | * It's better to skip it here and run corresponding
|
---|
| 6560 | * non-builtin later. */
|
---|
| 6561 | const struct built_in_command *x;
|
---|
| 6562 | x = BB_MMU ? find_builtin(argv[0]) : find_builtin1(argv[0]);
|
---|
| 6563 | if (x) {
|
---|
| 6564 | exec_builtin(&nommu_save->argv_from_re_execing, x, argv);
|
---|
[821] | 6565 | }
|
---|
[2725] | 6566 | }
|
---|
| 6567 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 6568 | /* Check if the command matches any functions */
|
---|
| 6569 | {
|
---|
| 6570 | const struct function *funcp = find_function(argv[0]);
|
---|
| 6571 | if (funcp) {
|
---|
| 6572 | exec_function(&nommu_save->argv_from_re_execing, funcp, argv);
|
---|
| 6573 | }
|
---|
| 6574 | }
|
---|
[1765] | 6575 | #endif
|
---|
[2725] | 6576 |
|
---|
| 6577 | #if ENABLE_FEATURE_SH_STANDALONE
|
---|
| 6578 | /* Check if the command matches any busybox applets */
|
---|
| 6579 | {
|
---|
| 6580 | int a = find_applet_by_name(argv[0]);
|
---|
| 6581 | if (a >= 0) {
|
---|
| 6582 | # if BB_MMU /* see above why on NOMMU it is not allowed */
|
---|
| 6583 | if (APPLET_IS_NOEXEC(a)) {
|
---|
| 6584 | debug_printf_exec("running applet '%s'\n", argv[0]);
|
---|
| 6585 | run_applet_no_and_exit(a, argv);
|
---|
| 6586 | }
|
---|
| 6587 | # endif
|
---|
| 6588 | /* Re-exec ourselves */
|
---|
| 6589 | debug_printf_exec("re-execing applet '%s'\n", argv[0]);
|
---|
[3232] | 6590 | /* Don't propagate SIG_IGN to the child */
|
---|
| 6591 | if (SPECIAL_JOBSTOP_SIGS != 0)
|
---|
| 6592 | switch_off_special_sigs(G.special_sig_mask & SPECIAL_JOBSTOP_SIGS);
|
---|
[2725] | 6593 | execv(bb_busybox_exec_path, argv);
|
---|
| 6594 | /* If they called chroot or otherwise made the binary no longer
|
---|
| 6595 | * executable, fall through */
|
---|
| 6596 | }
|
---|
[821] | 6597 | }
|
---|
[2725] | 6598 | #endif
|
---|
| 6599 |
|
---|
| 6600 | #if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
|
---|
| 6601 | skip:
|
---|
| 6602 | #endif
|
---|
| 6603 | execvp_or_die(argv);
|
---|
[821] | 6604 | }
|
---|
| 6605 |
|
---|
[2725] | 6606 | /* Called after [v]fork() in run_pipe
|
---|
| 6607 | */
|
---|
| 6608 | static void pseudo_exec(nommu_save_t *nommu_save,
|
---|
| 6609 | struct command *command,
|
---|
| 6610 | char **argv_expanded) NORETURN;
|
---|
| 6611 | static void pseudo_exec(nommu_save_t *nommu_save,
|
---|
| 6612 | struct command *command,
|
---|
| 6613 | char **argv_expanded)
|
---|
[821] | 6614 | {
|
---|
[2725] | 6615 | if (command->argv) {
|
---|
| 6616 | pseudo_exec_argv(nommu_save, command->argv,
|
---|
| 6617 | command->assignment_cnt, argv_expanded);
|
---|
| 6618 | }
|
---|
[1765] | 6619 |
|
---|
[2725] | 6620 | if (command->group) {
|
---|
| 6621 | /* Cases when we are here:
|
---|
| 6622 | * ( list )
|
---|
| 6623 | * { list } &
|
---|
| 6624 | * ... | ( list ) | ...
|
---|
| 6625 | * ... | { list } | ...
|
---|
| 6626 | */
|
---|
| 6627 | #if BB_MMU
|
---|
| 6628 | int rcode;
|
---|
| 6629 | debug_printf_exec("pseudo_exec: run_list\n");
|
---|
| 6630 | reset_traps_to_defaults();
|
---|
| 6631 | rcode = run_list(command->group);
|
---|
| 6632 | /* OK to leak memory by not calling free_pipe_list,
|
---|
| 6633 | * since this process is about to exit */
|
---|
| 6634 | _exit(rcode);
|
---|
| 6635 | #else
|
---|
| 6636 | re_execute_shell(&nommu_save->argv_from_re_execing,
|
---|
| 6637 | command->group_as_string,
|
---|
| 6638 | G.global_argv[0],
|
---|
| 6639 | G.global_argv + 1,
|
---|
| 6640 | NULL);
|
---|
| 6641 | #endif
|
---|
| 6642 | }
|
---|
[821] | 6643 |
|
---|
[2725] | 6644 | /* Case when we are here: ... | >file */
|
---|
| 6645 | debug_printf_exec("pseudo_exec'ed null command\n");
|
---|
| 6646 | _exit(EXIT_SUCCESS);
|
---|
| 6647 | }
|
---|
[821] | 6648 |
|
---|
[2725] | 6649 | #if ENABLE_HUSH_JOB
|
---|
| 6650 | static const char *get_cmdtext(struct pipe *pi)
|
---|
| 6651 | {
|
---|
| 6652 | char **argv;
|
---|
| 6653 | char *p;
|
---|
| 6654 | int len;
|
---|
[821] | 6655 |
|
---|
[2725] | 6656 | /* This is subtle. ->cmdtext is created only on first backgrounding.
|
---|
| 6657 | * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
|
---|
| 6658 | * On subsequent bg argv is trashed, but we won't use it */
|
---|
| 6659 | if (pi->cmdtext)
|
---|
| 6660 | return pi->cmdtext;
|
---|
| 6661 | argv = pi->cmds[0].argv;
|
---|
| 6662 | if (!argv || !argv[0]) {
|
---|
| 6663 | pi->cmdtext = xzalloc(1);
|
---|
| 6664 | return pi->cmdtext;
|
---|
[821] | 6665 | }
|
---|
| 6666 |
|
---|
[2725] | 6667 | len = 0;
|
---|
| 6668 | do {
|
---|
| 6669 | len += strlen(*argv) + 1;
|
---|
| 6670 | } while (*++argv);
|
---|
| 6671 | p = xmalloc(len);
|
---|
| 6672 | pi->cmdtext = p;
|
---|
| 6673 | argv = pi->cmds[0].argv;
|
---|
| 6674 | do {
|
---|
| 6675 | len = strlen(*argv);
|
---|
| 6676 | memcpy(p, *argv, len);
|
---|
| 6677 | p += len;
|
---|
| 6678 | *p++ = ' ';
|
---|
| 6679 | } while (*++argv);
|
---|
| 6680 | p[-1] = '\0';
|
---|
| 6681 | return pi->cmdtext;
|
---|
[821] | 6682 | }
|
---|
| 6683 |
|
---|
[2725] | 6684 | static void insert_bg_job(struct pipe *pi)
|
---|
[821] | 6685 | {
|
---|
[2725] | 6686 | struct pipe *job, **jobp;
|
---|
| 6687 | int i;
|
---|
[1765] | 6688 |
|
---|
[2725] | 6689 | /* Linear search for the ID of the job to use */
|
---|
| 6690 | pi->jobid = 1;
|
---|
| 6691 | for (job = G.job_list; job; job = job->next)
|
---|
| 6692 | if (job->jobid >= pi->jobid)
|
---|
| 6693 | pi->jobid = job->jobid + 1;
|
---|
| 6694 |
|
---|
| 6695 | /* Add job to the list of running jobs */
|
---|
| 6696 | jobp = &G.job_list;
|
---|
| 6697 | while ((job = *jobp) != NULL)
|
---|
| 6698 | jobp = &job->next;
|
---|
| 6699 | job = *jobp = xmalloc(sizeof(*job));
|
---|
| 6700 |
|
---|
| 6701 | *job = *pi; /* physical copy */
|
---|
| 6702 | job->next = NULL;
|
---|
| 6703 | job->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds);
|
---|
| 6704 | /* Cannot copy entire pi->cmds[] vector! This causes double frees */
|
---|
| 6705 | for (i = 0; i < pi->num_cmds; i++) {
|
---|
| 6706 | job->cmds[i].pid = pi->cmds[i].pid;
|
---|
| 6707 | /* all other fields are not used and stay zero */
|
---|
[821] | 6708 | }
|
---|
[2725] | 6709 | job->cmdtext = xstrdup(get_cmdtext(pi));
|
---|
[1765] | 6710 |
|
---|
[2725] | 6711 | if (G_interactive_fd)
|
---|
| 6712 | printf("[%d] %d %s\n", job->jobid, job->cmds[0].pid, job->cmdtext);
|
---|
| 6713 | G.last_jobid = job->jobid;
|
---|
[821] | 6714 | }
|
---|
| 6715 |
|
---|
[2725] | 6716 | static void remove_bg_job(struct pipe *pi)
|
---|
[821] | 6717 | {
|
---|
[2725] | 6718 | struct pipe *prev_pipe;
|
---|
| 6719 |
|
---|
| 6720 | if (pi == G.job_list) {
|
---|
| 6721 | G.job_list = pi->next;
|
---|
| 6722 | } else {
|
---|
| 6723 | prev_pipe = G.job_list;
|
---|
| 6724 | while (prev_pipe->next != pi)
|
---|
| 6725 | prev_pipe = prev_pipe->next;
|
---|
| 6726 | prev_pipe->next = pi->next;
|
---|
| 6727 | }
|
---|
| 6728 | if (G.job_list)
|
---|
| 6729 | G.last_jobid = G.job_list->jobid;
|
---|
| 6730 | else
|
---|
| 6731 | G.last_jobid = 0;
|
---|
[821] | 6732 | }
|
---|
| 6733 |
|
---|
[2725] | 6734 | /* Remove a backgrounded job */
|
---|
| 6735 | static void delete_finished_bg_job(struct pipe *pi)
|
---|
[821] | 6736 | {
|
---|
[2725] | 6737 | remove_bg_job(pi);
|
---|
| 6738 | free_pipe(pi);
|
---|
| 6739 | }
|
---|
| 6740 | #endif /* JOB */
|
---|
[1765] | 6741 |
|
---|
[2725] | 6742 | /* Check to see if any processes have exited -- if they
|
---|
| 6743 | * have, figure out why and see if a job has completed */
|
---|
| 6744 | static int checkjobs(struct pipe *fg_pipe)
|
---|
| 6745 | {
|
---|
| 6746 | int attributes;
|
---|
| 6747 | int status;
|
---|
| 6748 | #if ENABLE_HUSH_JOB
|
---|
| 6749 | struct pipe *pi;
|
---|
| 6750 | #endif
|
---|
| 6751 | pid_t childpid;
|
---|
| 6752 | int rcode = 0;
|
---|
| 6753 |
|
---|
| 6754 | debug_printf_jobs("checkjobs %p\n", fg_pipe);
|
---|
| 6755 |
|
---|
| 6756 | attributes = WUNTRACED;
|
---|
| 6757 | if (fg_pipe == NULL)
|
---|
| 6758 | attributes |= WNOHANG;
|
---|
| 6759 |
|
---|
| 6760 | errno = 0;
|
---|
| 6761 | #if ENABLE_HUSH_FAST
|
---|
| 6762 | if (G.handled_SIGCHLD == G.count_SIGCHLD) {
|
---|
| 6763 | //bb_error_msg("[%d] checkjobs: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d children?:%d fg_pipe:%p",
|
---|
| 6764 | //getpid(), G.count_SIGCHLD, G.handled_SIGCHLD, G.we_have_children, fg_pipe);
|
---|
| 6765 | /* There was neither fork nor SIGCHLD since last waitpid */
|
---|
| 6766 | /* Avoid doing waitpid syscall if possible */
|
---|
| 6767 | if (!G.we_have_children) {
|
---|
| 6768 | errno = ECHILD;
|
---|
| 6769 | return -1;
|
---|
[821] | 6770 | }
|
---|
[2725] | 6771 | if (fg_pipe == NULL) { /* is WNOHANG set? */
|
---|
| 6772 | /* We have children, but they did not exit
|
---|
| 6773 | * or stop yet (we saw no SIGCHLD) */
|
---|
| 6774 | return 0;
|
---|
| 6775 | }
|
---|
| 6776 | /* else: !WNOHANG, waitpid will block, can't short-circuit */
|
---|
| 6777 | }
|
---|
| 6778 | #endif
|
---|
| 6779 |
|
---|
| 6780 | /* Do we do this right?
|
---|
| 6781 | * bash-3.00# sleep 20 | false
|
---|
| 6782 | * <ctrl-Z pressed>
|
---|
| 6783 | * [3]+ Stopped sleep 20 | false
|
---|
| 6784 | * bash-3.00# echo $?
|
---|
| 6785 | * 1 <========== bg pipe is not fully done, but exitcode is already known!
|
---|
| 6786 | * [hush 1.14.0: yes we do it right]
|
---|
| 6787 | */
|
---|
| 6788 | wait_more:
|
---|
| 6789 | while (1) {
|
---|
| 6790 | int i;
|
---|
| 6791 | int dead;
|
---|
| 6792 |
|
---|
| 6793 | #if ENABLE_HUSH_FAST
|
---|
| 6794 | i = G.count_SIGCHLD;
|
---|
| 6795 | #endif
|
---|
| 6796 | childpid = waitpid(-1, &status, attributes);
|
---|
| 6797 | if (childpid <= 0) {
|
---|
| 6798 | if (childpid && errno != ECHILD)
|
---|
| 6799 | bb_perror_msg("waitpid");
|
---|
| 6800 | #if ENABLE_HUSH_FAST
|
---|
| 6801 | else { /* Until next SIGCHLD, waitpid's are useless */
|
---|
| 6802 | G.we_have_children = (childpid == 0);
|
---|
| 6803 | G.handled_SIGCHLD = i;
|
---|
| 6804 | //bb_error_msg("[%d] checkjobs: waitpid returned <= 0, G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
---|
[821] | 6805 | }
|
---|
[2725] | 6806 | #endif
|
---|
[821] | 6807 | break;
|
---|
[2725] | 6808 | }
|
---|
| 6809 | dead = WIFEXITED(status) || WIFSIGNALED(status);
|
---|
| 6810 |
|
---|
| 6811 | #if DEBUG_JOBS
|
---|
| 6812 | if (WIFSTOPPED(status))
|
---|
| 6813 | debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
|
---|
| 6814 | childpid, WSTOPSIG(status), WEXITSTATUS(status));
|
---|
| 6815 | if (WIFSIGNALED(status))
|
---|
| 6816 | debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
|
---|
| 6817 | childpid, WTERMSIG(status), WEXITSTATUS(status));
|
---|
| 6818 | if (WIFEXITED(status))
|
---|
| 6819 | debug_printf_jobs("pid %d exited, exitcode %d\n",
|
---|
| 6820 | childpid, WEXITSTATUS(status));
|
---|
[1765] | 6821 | #endif
|
---|
[2725] | 6822 | /* Were we asked to wait for fg pipe? */
|
---|
| 6823 | if (fg_pipe) {
|
---|
| 6824 | i = fg_pipe->num_cmds;
|
---|
| 6825 | while (--i >= 0) {
|
---|
| 6826 | debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid);
|
---|
| 6827 | if (fg_pipe->cmds[i].pid != childpid)
|
---|
| 6828 | continue;
|
---|
| 6829 | if (dead) {
|
---|
| 6830 | int ex;
|
---|
| 6831 | fg_pipe->cmds[i].pid = 0;
|
---|
| 6832 | fg_pipe->alive_cmds--;
|
---|
| 6833 | ex = WEXITSTATUS(status);
|
---|
| 6834 | /* bash prints killer signal's name for *last*
|
---|
[3232] | 6835 | * process in pipe (prints just newline for SIGINT/SIGPIPE).
|
---|
[2725] | 6836 | * Mimic this. Example: "sleep 5" + (^\ or kill -QUIT)
|
---|
| 6837 | */
|
---|
| 6838 | if (WIFSIGNALED(status)) {
|
---|
| 6839 | int sig = WTERMSIG(status);
|
---|
| 6840 | if (i == fg_pipe->num_cmds-1)
|
---|
[3232] | 6841 | /* TODO: use strsignal() instead for bash compat? but that's bloat... */
|
---|
[3621] | 6842 | puts(sig == SIGINT || sig == SIGPIPE ? "" : get_signame(sig));
|
---|
[3232] | 6843 | /* TODO: if (WCOREDUMP(status)) + " (core dumped)"; */
|
---|
[2725] | 6844 | /* TODO: MIPS has 128 sigs (1..128), what if sig==128 here?
|
---|
| 6845 | * Maybe we need to use sig | 128? */
|
---|
| 6846 | ex = sig + 128;
|
---|
| 6847 | }
|
---|
| 6848 | fg_pipe->cmds[i].cmd_exitcode = ex;
|
---|
| 6849 | } else {
|
---|
| 6850 | fg_pipe->stopped_cmds++;
|
---|
| 6851 | }
|
---|
| 6852 | debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n",
|
---|
| 6853 | fg_pipe->alive_cmds, fg_pipe->stopped_cmds);
|
---|
| 6854 | if (fg_pipe->alive_cmds == fg_pipe->stopped_cmds) {
|
---|
| 6855 | /* All processes in fg pipe have exited or stopped */
|
---|
| 6856 | i = fg_pipe->num_cmds;
|
---|
| 6857 | while (--i >= 0) {
|
---|
| 6858 | rcode = fg_pipe->cmds[i].cmd_exitcode;
|
---|
| 6859 | /* usually last process gives overall exitstatus,
|
---|
| 6860 | * but with "set -o pipefail", last *failed* process does */
|
---|
| 6861 | if (G.o_opt[OPT_O_PIPEFAIL] == 0 || rcode != 0)
|
---|
| 6862 | break;
|
---|
| 6863 | }
|
---|
| 6864 | IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;)
|
---|
| 6865 | /* Note: *non-interactive* bash does not continue if all processes in fg pipe
|
---|
| 6866 | * are stopped. Testcase: "cat | cat" in a script (not on command line!)
|
---|
| 6867 | * and "killall -STOP cat" */
|
---|
| 6868 | if (G_interactive_fd) {
|
---|
| 6869 | #if ENABLE_HUSH_JOB
|
---|
| 6870 | if (fg_pipe->alive_cmds != 0)
|
---|
| 6871 | insert_bg_job(fg_pipe);
|
---|
| 6872 | #endif
|
---|
| 6873 | return rcode;
|
---|
| 6874 | }
|
---|
| 6875 | if (fg_pipe->alive_cmds == 0)
|
---|
| 6876 | return rcode;
|
---|
| 6877 | }
|
---|
| 6878 | /* There are still running processes in the fg pipe */
|
---|
| 6879 | goto wait_more; /* do waitpid again */
|
---|
| 6880 | }
|
---|
| 6881 | /* it wasnt fg_pipe, look for process in bg pipes */
|
---|
| 6882 | }
|
---|
| 6883 |
|
---|
| 6884 | #if ENABLE_HUSH_JOB
|
---|
| 6885 | /* We asked to wait for bg or orphaned children */
|
---|
| 6886 | /* No need to remember exitcode in this case */
|
---|
| 6887 | for (pi = G.job_list; pi; pi = pi->next) {
|
---|
| 6888 | for (i = 0; i < pi->num_cmds; i++) {
|
---|
| 6889 | if (pi->cmds[i].pid == childpid)
|
---|
| 6890 | goto found_pi_and_prognum;
|
---|
| 6891 | }
|
---|
| 6892 | }
|
---|
| 6893 | /* Happens when shell is used as init process (init=/bin/sh) */
|
---|
| 6894 | debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
|
---|
| 6895 | continue; /* do waitpid again */
|
---|
| 6896 |
|
---|
| 6897 | found_pi_and_prognum:
|
---|
| 6898 | if (dead) {
|
---|
| 6899 | /* child exited */
|
---|
| 6900 | pi->cmds[i].pid = 0;
|
---|
| 6901 | pi->alive_cmds--;
|
---|
| 6902 | if (!pi->alive_cmds) {
|
---|
| 6903 | if (G_interactive_fd)
|
---|
| 6904 | printf(JOB_STATUS_FORMAT, pi->jobid,
|
---|
| 6905 | "Done", pi->cmdtext);
|
---|
| 6906 | delete_finished_bg_job(pi);
|
---|
| 6907 | }
|
---|
| 6908 | } else {
|
---|
| 6909 | /* child stopped */
|
---|
| 6910 | pi->stopped_cmds++;
|
---|
| 6911 | }
|
---|
| 6912 | #endif
|
---|
| 6913 | } /* while (waitpid succeeds)... */
|
---|
| 6914 |
|
---|
| 6915 | return rcode;
|
---|
| 6916 | }
|
---|
| 6917 |
|
---|
| 6918 | #if ENABLE_HUSH_JOB
|
---|
| 6919 | static int checkjobs_and_fg_shell(struct pipe *fg_pipe)
|
---|
| 6920 | {
|
---|
| 6921 | pid_t p;
|
---|
| 6922 | int rcode = checkjobs(fg_pipe);
|
---|
| 6923 | if (G_saved_tty_pgrp) {
|
---|
| 6924 | /* Job finished, move the shell to the foreground */
|
---|
| 6925 | p = getpgrp(); /* our process group id */
|
---|
| 6926 | debug_printf_jobs("fg'ing ourself: getpgrp()=%d\n", (int)p);
|
---|
| 6927 | tcsetpgrp(G_interactive_fd, p);
|
---|
[821] | 6928 | }
|
---|
[2725] | 6929 | return rcode;
|
---|
[821] | 6930 | }
|
---|
[2725] | 6931 | #endif
|
---|
[821] | 6932 |
|
---|
[2725] | 6933 | /* Start all the jobs, but don't wait for anything to finish.
|
---|
| 6934 | * See checkjobs().
|
---|
| 6935 | *
|
---|
| 6936 | * Return code is normally -1, when the caller has to wait for children
|
---|
| 6937 | * to finish to determine the exit status of the pipe. If the pipe
|
---|
| 6938 | * is a simple builtin command, however, the action is done by the
|
---|
| 6939 | * time run_pipe returns, and the exit code is provided as the
|
---|
| 6940 | * return value.
|
---|
| 6941 | *
|
---|
| 6942 | * Returns -1 only if started some children. IOW: we have to
|
---|
| 6943 | * mask out retvals of builtins etc with 0xff!
|
---|
| 6944 | *
|
---|
| 6945 | * The only case when we do not need to [v]fork is when the pipe
|
---|
| 6946 | * is single, non-backgrounded, non-subshell command. Examples:
|
---|
| 6947 | * cmd ; ... { list } ; ...
|
---|
| 6948 | * cmd && ... { list } && ...
|
---|
| 6949 | * cmd || ... { list } || ...
|
---|
[3232] | 6950 | * If it is, then we can run cmd as a builtin, NOFORK,
|
---|
[2725] | 6951 | * or (if SH_STANDALONE) an applet, and we can run the { list }
|
---|
| 6952 | * with run_list. If it isn't one of these, we fork and exec cmd.
|
---|
| 6953 | *
|
---|
| 6954 | * Cases when we must fork:
|
---|
| 6955 | * non-single: cmd | cmd
|
---|
| 6956 | * backgrounded: cmd & { list } &
|
---|
| 6957 | * subshell: ( list ) [&]
|
---|
| 6958 | */
|
---|
| 6959 | #if !ENABLE_HUSH_MODE_X
|
---|
| 6960 | #define redirect_and_varexp_helper(new_env_p, old_vars_p, command, squirrel, argv_expanded) \
|
---|
| 6961 | redirect_and_varexp_helper(new_env_p, old_vars_p, command, squirrel)
|
---|
| 6962 | #endif
|
---|
| 6963 | static int redirect_and_varexp_helper(char ***new_env_p,
|
---|
| 6964 | struct variable **old_vars_p,
|
---|
| 6965 | struct command *command,
|
---|
| 6966 | int squirrel[3],
|
---|
| 6967 | char **argv_expanded)
|
---|
[821] | 6968 | {
|
---|
[2725] | 6969 | /* setup_redirects acts on file descriptors, not FILEs.
|
---|
| 6970 | * This is perfect for work that comes after exec().
|
---|
| 6971 | * Is it really safe for inline use? Experimentally,
|
---|
| 6972 | * things seem to work. */
|
---|
| 6973 | int rcode = setup_redirects(command, squirrel);
|
---|
| 6974 | if (rcode == 0) {
|
---|
| 6975 | char **new_env = expand_assignments(command->argv, command->assignment_cnt);
|
---|
| 6976 | *new_env_p = new_env;
|
---|
| 6977 | dump_cmd_in_x_mode(new_env);
|
---|
| 6978 | dump_cmd_in_x_mode(argv_expanded);
|
---|
| 6979 | if (old_vars_p)
|
---|
| 6980 | *old_vars_p = set_vars_and_save_old(new_env);
|
---|
| 6981 | }
|
---|
| 6982 | return rcode;
|
---|
| 6983 | }
|
---|
| 6984 | static NOINLINE int run_pipe(struct pipe *pi)
|
---|
| 6985 | {
|
---|
| 6986 | static const char *const null_ptr = NULL;
|
---|
[821] | 6987 |
|
---|
[2725] | 6988 | int cmd_no;
|
---|
| 6989 | int next_infd;
|
---|
| 6990 | struct command *command;
|
---|
| 6991 | char **argv_expanded;
|
---|
| 6992 | char **argv;
|
---|
| 6993 | /* it is not always needed, but we aim to smaller code */
|
---|
| 6994 | int squirrel[] = { -1, -1, -1 };
|
---|
| 6995 | int rcode;
|
---|
[821] | 6996 |
|
---|
[2725] | 6997 | debug_printf_exec("run_pipe start: members:%d\n", pi->num_cmds);
|
---|
| 6998 | debug_enter();
|
---|
[1765] | 6999 |
|
---|
[2725] | 7000 | /* Testcase: set -- q w e; (IFS='' echo "$*"; IFS=''; echo "$*"); echo "$*"
|
---|
| 7001 | * Result should be 3 lines: q w e, qwe, q w e
|
---|
| 7002 | */
|
---|
| 7003 | G.ifs = get_local_var_value("IFS");
|
---|
| 7004 | if (!G.ifs)
|
---|
| 7005 | G.ifs = defifs;
|
---|
| 7006 |
|
---|
| 7007 | IF_HUSH_JOB(pi->pgrp = -1;)
|
---|
| 7008 | pi->stopped_cmds = 0;
|
---|
| 7009 | command = &pi->cmds[0];
|
---|
| 7010 | argv_expanded = NULL;
|
---|
| 7011 |
|
---|
| 7012 | if (pi->num_cmds != 1
|
---|
| 7013 | || pi->followup == PIPE_BG
|
---|
| 7014 | || command->cmd_type == CMD_SUBSHELL
|
---|
| 7015 | ) {
|
---|
| 7016 | goto must_fork;
|
---|
| 7017 | }
|
---|
| 7018 |
|
---|
| 7019 | pi->alive_cmds = 1;
|
---|
| 7020 |
|
---|
| 7021 | debug_printf_exec(": group:%p argv:'%s'\n",
|
---|
| 7022 | command->group, command->argv ? command->argv[0] : "NONE");
|
---|
| 7023 |
|
---|
| 7024 | if (command->group) {
|
---|
| 7025 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 7026 | if (command->cmd_type == CMD_FUNCDEF) {
|
---|
| 7027 | /* "executing" func () { list } */
|
---|
| 7028 | struct function *funcp;
|
---|
| 7029 |
|
---|
| 7030 | funcp = new_function(command->argv[0]);
|
---|
| 7031 | /* funcp->name is already set to argv[0] */
|
---|
| 7032 | funcp->body = command->group;
|
---|
| 7033 | # if !BB_MMU
|
---|
| 7034 | funcp->body_as_string = command->group_as_string;
|
---|
| 7035 | command->group_as_string = NULL;
|
---|
| 7036 | # endif
|
---|
| 7037 | command->group = NULL;
|
---|
| 7038 | command->argv[0] = NULL;
|
---|
| 7039 | debug_printf_exec("cmd %p has child func at %p\n", command, funcp);
|
---|
| 7040 | funcp->parent_cmd = command;
|
---|
| 7041 | command->child_func = funcp;
|
---|
| 7042 |
|
---|
| 7043 | debug_printf_exec("run_pipe: return EXIT_SUCCESS\n");
|
---|
| 7044 | debug_leave();
|
---|
| 7045 | return EXIT_SUCCESS;
|
---|
[1765] | 7046 | }
|
---|
[2725] | 7047 | #endif
|
---|
| 7048 | /* { list } */
|
---|
| 7049 | debug_printf("non-subshell group\n");
|
---|
| 7050 | rcode = 1; /* exitcode if redir failed */
|
---|
| 7051 | if (setup_redirects(command, squirrel) == 0) {
|
---|
| 7052 | debug_printf_exec(": run_list\n");
|
---|
| 7053 | rcode = run_list(command->group) & 0xff;
|
---|
| 7054 | }
|
---|
| 7055 | restore_redirects(squirrel);
|
---|
| 7056 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
|
---|
| 7057 | debug_leave();
|
---|
| 7058 | debug_printf_exec("run_pipe: return %d\n", rcode);
|
---|
| 7059 | return rcode;
|
---|
| 7060 | }
|
---|
| 7061 |
|
---|
| 7062 | argv = command->argv ? command->argv : (char **) &null_ptr;
|
---|
| 7063 | {
|
---|
| 7064 | const struct built_in_command *x;
|
---|
| 7065 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 7066 | const struct function *funcp;
|
---|
| 7067 | #else
|
---|
| 7068 | enum { funcp = 0 };
|
---|
| 7069 | #endif
|
---|
| 7070 | char **new_env = NULL;
|
---|
| 7071 | struct variable *old_vars = NULL;
|
---|
| 7072 |
|
---|
| 7073 | if (argv[command->assignment_cnt] == NULL) {
|
---|
| 7074 | /* Assignments, but no command */
|
---|
| 7075 | /* Ensure redirects take effect (that is, create files).
|
---|
| 7076 | * Try "a=t >file" */
|
---|
| 7077 | #if 0 /* A few cases in testsuite fail with this code. FIXME */
|
---|
| 7078 | rcode = redirect_and_varexp_helper(&new_env, /*old_vars:*/ NULL, command, squirrel, /*argv_expanded:*/ NULL);
|
---|
| 7079 | /* Set shell variables */
|
---|
| 7080 | if (new_env) {
|
---|
| 7081 | argv = new_env;
|
---|
| 7082 | while (*argv) {
|
---|
| 7083 | set_local_var(*argv, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
---|
| 7084 | /* Do we need to flag set_local_var() errors?
|
---|
| 7085 | * "assignment to readonly var" and "putenv error"
|
---|
| 7086 | */
|
---|
| 7087 | argv++;
|
---|
| 7088 | }
|
---|
[1765] | 7089 | }
|
---|
[2725] | 7090 | /* Redirect error sets $? to 1. Otherwise,
|
---|
| 7091 | * if evaluating assignment value set $?, retain it.
|
---|
| 7092 | * Try "false; q=`exit 2`; echo $?" - should print 2: */
|
---|
| 7093 | if (rcode == 0)
|
---|
| 7094 | rcode = G.last_exitcode;
|
---|
| 7095 | /* Exit, _skipping_ variable restoring code: */
|
---|
| 7096 | goto clean_up_and_ret0;
|
---|
| 7097 |
|
---|
| 7098 | #else /* Older, bigger, but more correct code */
|
---|
| 7099 |
|
---|
| 7100 | rcode = setup_redirects(command, squirrel);
|
---|
| 7101 | restore_redirects(squirrel);
|
---|
| 7102 | /* Set shell variables */
|
---|
| 7103 | if (G_x_mode)
|
---|
| 7104 | bb_putchar_stderr('+');
|
---|
| 7105 | while (*argv) {
|
---|
| 7106 | char *p = expand_string_to_string(*argv, /*unbackslash:*/ 1);
|
---|
| 7107 | if (G_x_mode)
|
---|
| 7108 | fprintf(stderr, " %s", p);
|
---|
| 7109 | debug_printf_exec("set shell var:'%s'->'%s'\n",
|
---|
| 7110 | *argv, p);
|
---|
| 7111 | set_local_var(p, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
---|
| 7112 | /* Do we need to flag set_local_var() errors?
|
---|
| 7113 | * "assignment to readonly var" and "putenv error"
|
---|
| 7114 | */
|
---|
| 7115 | argv++;
|
---|
| 7116 | }
|
---|
| 7117 | if (G_x_mode)
|
---|
| 7118 | bb_putchar_stderr('\n');
|
---|
| 7119 | /* Redirect error sets $? to 1. Otherwise,
|
---|
| 7120 | * if evaluating assignment value set $?, retain it.
|
---|
| 7121 | * Try "false; q=`exit 2`; echo $?" - should print 2: */
|
---|
| 7122 | if (rcode == 0)
|
---|
| 7123 | rcode = G.last_exitcode;
|
---|
| 7124 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
|
---|
| 7125 | debug_leave();
|
---|
| 7126 | debug_printf_exec("run_pipe: return %d\n", rcode);
|
---|
| 7127 | return rcode;
|
---|
| 7128 | #endif
|
---|
[1765] | 7129 | }
|
---|
[2725] | 7130 |
|
---|
| 7131 | /* Expand the rest into (possibly) many strings each */
|
---|
| 7132 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
[3232] | 7133 | if (command->cmd_type == CMD_SINGLEWORD_NOGLOB) {
|
---|
[2725] | 7134 | argv_expanded = expand_strvec_to_strvec_singleword_noglob(argv + command->assignment_cnt);
|
---|
[3232] | 7135 | } else
|
---|
[2725] | 7136 | #endif
|
---|
[3232] | 7137 | {
|
---|
[2725] | 7138 | argv_expanded = expand_strvec_to_strvec(argv + command->assignment_cnt);
|
---|
| 7139 | }
|
---|
| 7140 |
|
---|
| 7141 | /* if someone gives us an empty string: `cmd with empty output` */
|
---|
| 7142 | if (!argv_expanded[0]) {
|
---|
| 7143 | free(argv_expanded);
|
---|
| 7144 | debug_leave();
|
---|
| 7145 | return G.last_exitcode;
|
---|
| 7146 | }
|
---|
| 7147 |
|
---|
| 7148 | x = find_builtin(argv_expanded[0]);
|
---|
| 7149 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 7150 | funcp = NULL;
|
---|
| 7151 | if (!x)
|
---|
| 7152 | funcp = find_function(argv_expanded[0]);
|
---|
| 7153 | #endif
|
---|
| 7154 | if (x || funcp) {
|
---|
| 7155 | if (!funcp) {
|
---|
| 7156 | if (x->b_function == builtin_exec && argv_expanded[1] == NULL) {
|
---|
| 7157 | debug_printf("exec with redirects only\n");
|
---|
| 7158 | rcode = setup_redirects(command, NULL);
|
---|
| 7159 | goto clean_up_and_ret1;
|
---|
| 7160 | }
|
---|
[821] | 7161 | }
|
---|
[2725] | 7162 | rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, squirrel, argv_expanded);
|
---|
| 7163 | if (rcode == 0) {
|
---|
| 7164 | if (!funcp) {
|
---|
| 7165 | debug_printf_exec(": builtin '%s' '%s'...\n",
|
---|
| 7166 | x->b_cmd, argv_expanded[1]);
|
---|
[3232] | 7167 | fflush_all();
|
---|
[2725] | 7168 | rcode = x->b_function(argv_expanded) & 0xff;
|
---|
| 7169 | fflush_all();
|
---|
| 7170 | }
|
---|
| 7171 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 7172 | else {
|
---|
| 7173 | # if ENABLE_HUSH_LOCAL
|
---|
| 7174 | struct variable **sv;
|
---|
| 7175 | sv = G.shadowed_vars_pp;
|
---|
| 7176 | G.shadowed_vars_pp = &old_vars;
|
---|
| 7177 | # endif
|
---|
| 7178 | debug_printf_exec(": function '%s' '%s'...\n",
|
---|
| 7179 | funcp->name, argv_expanded[1]);
|
---|
| 7180 | rcode = run_function(funcp, argv_expanded) & 0xff;
|
---|
| 7181 | # if ENABLE_HUSH_LOCAL
|
---|
| 7182 | G.shadowed_vars_pp = sv;
|
---|
| 7183 | # endif
|
---|
| 7184 | }
|
---|
| 7185 | #endif
|
---|
[821] | 7186 | }
|
---|
[2725] | 7187 | clean_up_and_ret:
|
---|
| 7188 | unset_vars(new_env);
|
---|
| 7189 | add_vars(old_vars);
|
---|
| 7190 | /* clean_up_and_ret0: */
|
---|
| 7191 | restore_redirects(squirrel);
|
---|
| 7192 | clean_up_and_ret1:
|
---|
| 7193 | free(argv_expanded);
|
---|
| 7194 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
|
---|
| 7195 | debug_leave();
|
---|
| 7196 | debug_printf_exec("run_pipe return %d\n", rcode);
|
---|
| 7197 | return rcode;
|
---|
[1765] | 7198 | }
|
---|
[2725] | 7199 |
|
---|
[3232] | 7200 | if (ENABLE_FEATURE_SH_NOFORK) {
|
---|
[2725] | 7201 | int n = find_applet_by_name(argv_expanded[0]);
|
---|
| 7202 | if (n >= 0 && APPLET_IS_NOFORK(n)) {
|
---|
| 7203 | rcode = redirect_and_varexp_helper(&new_env, &old_vars, command, squirrel, argv_expanded);
|
---|
| 7204 | if (rcode == 0) {
|
---|
| 7205 | debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
|
---|
| 7206 | argv_expanded[0], argv_expanded[1]);
|
---|
| 7207 | rcode = run_nofork_applet(n, argv_expanded);
|
---|
| 7208 | }
|
---|
| 7209 | goto clean_up_and_ret;
|
---|
| 7210 | }
|
---|
[1765] | 7211 | }
|
---|
[2725] | 7212 | /* It is neither builtin nor applet. We must fork. */
|
---|
| 7213 | }
|
---|
| 7214 |
|
---|
| 7215 | must_fork:
|
---|
| 7216 | /* NB: argv_expanded may already be created, and that
|
---|
| 7217 | * might include `cmd` runs! Do not rerun it! We *must*
|
---|
| 7218 | * use argv_expanded if it's non-NULL */
|
---|
| 7219 |
|
---|
| 7220 | /* Going to fork a child per each pipe member */
|
---|
| 7221 | pi->alive_cmds = 0;
|
---|
| 7222 | next_infd = 0;
|
---|
| 7223 |
|
---|
| 7224 | cmd_no = 0;
|
---|
| 7225 | while (cmd_no < pi->num_cmds) {
|
---|
| 7226 | struct fd_pair pipefds;
|
---|
| 7227 | #if !BB_MMU
|
---|
| 7228 | volatile nommu_save_t nommu_save;
|
---|
| 7229 | nommu_save.new_env = NULL;
|
---|
| 7230 | nommu_save.old_vars = NULL;
|
---|
| 7231 | nommu_save.argv = NULL;
|
---|
| 7232 | nommu_save.argv_from_re_execing = NULL;
|
---|
| 7233 | #endif
|
---|
| 7234 | command = &pi->cmds[cmd_no];
|
---|
| 7235 | cmd_no++;
|
---|
| 7236 | if (command->argv) {
|
---|
| 7237 | debug_printf_exec(": pipe member '%s' '%s'...\n",
|
---|
| 7238 | command->argv[0], command->argv[1]);
|
---|
| 7239 | } else {
|
---|
| 7240 | debug_printf_exec(": pipe member with no argv\n");
|
---|
| 7241 | }
|
---|
| 7242 |
|
---|
| 7243 | /* pipes are inserted between pairs of commands */
|
---|
| 7244 | pipefds.rd = 0;
|
---|
| 7245 | pipefds.wr = 1;
|
---|
| 7246 | if (cmd_no < pi->num_cmds)
|
---|
| 7247 | xpiped_pair(pipefds);
|
---|
| 7248 |
|
---|
| 7249 | command->pid = BB_MMU ? fork() : vfork();
|
---|
| 7250 | if (!command->pid) { /* child */
|
---|
| 7251 | #if ENABLE_HUSH_JOB
|
---|
| 7252 | disable_restore_tty_pgrp_on_exit();
|
---|
| 7253 | CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
|
---|
| 7254 |
|
---|
| 7255 | /* Every child adds itself to new process group
|
---|
| 7256 | * with pgid == pid_of_first_child_in_pipe */
|
---|
| 7257 | if (G.run_list_level == 1 && G_interactive_fd) {
|
---|
| 7258 | pid_t pgrp;
|
---|
| 7259 | pgrp = pi->pgrp;
|
---|
| 7260 | if (pgrp < 0) /* true for 1st process only */
|
---|
| 7261 | pgrp = getpid();
|
---|
| 7262 | if (setpgid(0, pgrp) == 0
|
---|
| 7263 | && pi->followup != PIPE_BG
|
---|
| 7264 | && G_saved_tty_pgrp /* we have ctty */
|
---|
| 7265 | ) {
|
---|
| 7266 | /* We do it in *every* child, not just first,
|
---|
| 7267 | * to avoid races */
|
---|
| 7268 | tcsetpgrp(G_interactive_fd, pgrp);
|
---|
[1765] | 7269 | }
|
---|
[2725] | 7270 | }
|
---|
| 7271 | #endif
|
---|
| 7272 | if (pi->alive_cmds == 0 && pi->followup == PIPE_BG) {
|
---|
| 7273 | /* 1st cmd in backgrounded pipe
|
---|
| 7274 | * should have its stdin /dev/null'ed */
|
---|
| 7275 | close(0);
|
---|
| 7276 | if (open(bb_dev_null, O_RDONLY))
|
---|
| 7277 | xopen("/", O_RDONLY);
|
---|
[821] | 7278 | } else {
|
---|
[2725] | 7279 | xmove_fd(next_infd, 0);
|
---|
[821] | 7280 | }
|
---|
[2725] | 7281 | xmove_fd(pipefds.wr, 1);
|
---|
| 7282 | if (pipefds.rd > 1)
|
---|
| 7283 | close(pipefds.rd);
|
---|
| 7284 | /* Like bash, explicit redirects override pipes,
|
---|
| 7285 | * and the pipe fd is available for dup'ing. */
|
---|
| 7286 | if (setup_redirects(command, NULL))
|
---|
| 7287 | _exit(1);
|
---|
| 7288 |
|
---|
| 7289 | /* Stores to nommu_save list of env vars putenv'ed
|
---|
| 7290 | * (NOMMU, on MMU we don't need that) */
|
---|
| 7291 | /* cast away volatility... */
|
---|
| 7292 | pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded);
|
---|
| 7293 | /* pseudo_exec() does not return */
|
---|
| 7294 | }
|
---|
| 7295 |
|
---|
| 7296 | /* parent or error */
|
---|
| 7297 | #if ENABLE_HUSH_FAST
|
---|
| 7298 | G.count_SIGCHLD++;
|
---|
| 7299 | //bb_error_msg("[%d] fork in run_pipe: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
---|
| 7300 | #endif
|
---|
| 7301 | enable_restore_tty_pgrp_on_exit();
|
---|
| 7302 | #if !BB_MMU
|
---|
| 7303 | /* Clean up after vforked child */
|
---|
| 7304 | free(nommu_save.argv);
|
---|
| 7305 | free(nommu_save.argv_from_re_execing);
|
---|
| 7306 | unset_vars(nommu_save.new_env);
|
---|
| 7307 | add_vars(nommu_save.old_vars);
|
---|
| 7308 | #endif
|
---|
| 7309 | free(argv_expanded);
|
---|
| 7310 | argv_expanded = NULL;
|
---|
| 7311 | if (command->pid < 0) { /* [v]fork failed */
|
---|
| 7312 | /* Clearly indicate, was it fork or vfork */
|
---|
| 7313 | bb_perror_msg(BB_MMU ? "vfork"+1 : "vfork");
|
---|
| 7314 | } else {
|
---|
| 7315 | pi->alive_cmds++;
|
---|
| 7316 | #if ENABLE_HUSH_JOB
|
---|
| 7317 | /* Second and next children need to know pid of first one */
|
---|
| 7318 | if (pi->pgrp < 0)
|
---|
| 7319 | pi->pgrp = command->pid;
|
---|
| 7320 | #endif
|
---|
| 7321 | }
|
---|
| 7322 |
|
---|
| 7323 | if (cmd_no > 1)
|
---|
| 7324 | close(next_infd);
|
---|
| 7325 | if (cmd_no < pi->num_cmds)
|
---|
| 7326 | close(pipefds.wr);
|
---|
| 7327 | /* Pass read (output) pipe end to next iteration */
|
---|
| 7328 | next_infd = pipefds.rd;
|
---|
| 7329 | }
|
---|
| 7330 |
|
---|
| 7331 | if (!pi->alive_cmds) {
|
---|
| 7332 | debug_leave();
|
---|
| 7333 | debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
|
---|
| 7334 | return 1;
|
---|
| 7335 | }
|
---|
| 7336 |
|
---|
| 7337 | debug_leave();
|
---|
| 7338 | debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds);
|
---|
| 7339 | return -1;
|
---|
| 7340 | }
|
---|
| 7341 |
|
---|
| 7342 | /* NB: called by pseudo_exec, and therefore must not modify any
|
---|
| 7343 | * global data until exec/_exit (we can be a child after vfork!) */
|
---|
| 7344 | static int run_list(struct pipe *pi)
|
---|
| 7345 | {
|
---|
| 7346 | #if ENABLE_HUSH_CASE
|
---|
| 7347 | char *case_word = NULL;
|
---|
| 7348 | #endif
|
---|
| 7349 | #if ENABLE_HUSH_LOOPS
|
---|
| 7350 | struct pipe *loop_top = NULL;
|
---|
| 7351 | char **for_lcur = NULL;
|
---|
| 7352 | char **for_list = NULL;
|
---|
| 7353 | #endif
|
---|
| 7354 | smallint last_followup;
|
---|
| 7355 | smalluint rcode;
|
---|
| 7356 | #if ENABLE_HUSH_IF || ENABLE_HUSH_CASE
|
---|
| 7357 | smalluint cond_code = 0;
|
---|
| 7358 | #else
|
---|
| 7359 | enum { cond_code = 0 };
|
---|
| 7360 | #endif
|
---|
| 7361 | #if HAS_KEYWORDS
|
---|
| 7362 | smallint rword; /* RES_foo */
|
---|
| 7363 | smallint last_rword; /* ditto */
|
---|
| 7364 | #endif
|
---|
| 7365 |
|
---|
| 7366 | debug_printf_exec("run_list start lvl %d\n", G.run_list_level);
|
---|
| 7367 | debug_enter();
|
---|
| 7368 |
|
---|
| 7369 | #if ENABLE_HUSH_LOOPS
|
---|
| 7370 | /* Check syntax for "for" */
|
---|
| 7371 | {
|
---|
| 7372 | struct pipe *cpipe;
|
---|
| 7373 | for (cpipe = pi; cpipe; cpipe = cpipe->next) {
|
---|
| 7374 | if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN)
|
---|
| 7375 | continue;
|
---|
| 7376 | /* current word is FOR or IN (BOLD in comments below) */
|
---|
| 7377 | if (cpipe->next == NULL) {
|
---|
| 7378 | syntax_error("malformed for");
|
---|
| 7379 | debug_leave();
|
---|
| 7380 | debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
|
---|
[821] | 7381 | return 1;
|
---|
| 7382 | }
|
---|
[2725] | 7383 | /* "FOR v; do ..." and "for v IN a b; do..." are ok */
|
---|
| 7384 | if (cpipe->next->res_word == RES_DO)
|
---|
| 7385 | continue;
|
---|
| 7386 | /* next word is not "do". It must be "in" then ("FOR v in ...") */
|
---|
| 7387 | if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */
|
---|
| 7388 | || cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
|
---|
| 7389 | ) {
|
---|
| 7390 | syntax_error("malformed for");
|
---|
| 7391 | debug_leave();
|
---|
| 7392 | debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
|
---|
[1765] | 7393 | return 1;
|
---|
| 7394 | }
|
---|
[2725] | 7395 | }
|
---|
| 7396 | }
|
---|
| 7397 | #endif
|
---|
| 7398 |
|
---|
| 7399 | /* Past this point, all code paths should jump to ret: label
|
---|
| 7400 | * in order to return, no direct "return" statements please.
|
---|
| 7401 | * This helps to ensure that no memory is leaked. */
|
---|
| 7402 |
|
---|
| 7403 | #if ENABLE_HUSH_JOB
|
---|
| 7404 | G.run_list_level++;
|
---|
| 7405 | #endif
|
---|
| 7406 |
|
---|
| 7407 | #if HAS_KEYWORDS
|
---|
| 7408 | rword = RES_NONE;
|
---|
| 7409 | last_rword = RES_XXXX;
|
---|
| 7410 | #endif
|
---|
| 7411 | last_followup = PIPE_SEQ;
|
---|
| 7412 | rcode = G.last_exitcode;
|
---|
| 7413 |
|
---|
| 7414 | /* Go through list of pipes, (maybe) executing them. */
|
---|
| 7415 | for (; pi; pi = IF_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) {
|
---|
| 7416 | if (G.flag_SIGINT)
|
---|
[821] | 7417 | break;
|
---|
[2725] | 7418 |
|
---|
| 7419 | IF_HAS_KEYWORDS(rword = pi->res_word;)
|
---|
| 7420 | debug_printf_exec(": rword=%d cond_code=%d last_rword=%d\n",
|
---|
| 7421 | rword, cond_code, last_rword);
|
---|
| 7422 | #if ENABLE_HUSH_LOOPS
|
---|
| 7423 | if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR)
|
---|
| 7424 | && loop_top == NULL /* avoid bumping G.depth_of_loop twice */
|
---|
| 7425 | ) {
|
---|
| 7426 | /* start of a loop: remember where loop starts */
|
---|
| 7427 | loop_top = pi;
|
---|
| 7428 | G.depth_of_loop++;
|
---|
| 7429 | }
|
---|
| 7430 | #endif
|
---|
| 7431 | /* Still in the same "if...", "then..." or "do..." branch? */
|
---|
| 7432 | if (IF_HAS_KEYWORDS(rword == last_rword &&) 1) {
|
---|
| 7433 | if ((rcode == 0 && last_followup == PIPE_OR)
|
---|
| 7434 | || (rcode != 0 && last_followup == PIPE_AND)
|
---|
| 7435 | ) {
|
---|
| 7436 | /* It is "<true> || CMD" or "<false> && CMD"
|
---|
| 7437 | * and we should not execute CMD */
|
---|
| 7438 | debug_printf_exec("skipped cmd because of || or &&\n");
|
---|
| 7439 | last_followup = pi->followup;
|
---|
[3621] | 7440 | goto dont_check_jobs_but_continue;
|
---|
[821] | 7441 | }
|
---|
[2725] | 7442 | }
|
---|
| 7443 | last_followup = pi->followup;
|
---|
| 7444 | IF_HAS_KEYWORDS(last_rword = rword;)
|
---|
| 7445 | #if ENABLE_HUSH_IF
|
---|
| 7446 | if (cond_code) {
|
---|
| 7447 | if (rword == RES_THEN) {
|
---|
| 7448 | /* if false; then ... fi has exitcode 0! */
|
---|
| 7449 | G.last_exitcode = rcode = EXIT_SUCCESS;
|
---|
| 7450 | /* "if <false> THEN cmd": skip cmd */
|
---|
| 7451 | continue;
|
---|
[821] | 7452 | }
|
---|
[2725] | 7453 | } else {
|
---|
| 7454 | if (rword == RES_ELSE || rword == RES_ELIF) {
|
---|
| 7455 | /* "if <true> then ... ELSE/ELIF cmd":
|
---|
| 7456 | * skip cmd and all following ones */
|
---|
| 7457 | break;
|
---|
| 7458 | }
|
---|
| 7459 | }
|
---|
[1765] | 7460 | #endif
|
---|
[2725] | 7461 | #if ENABLE_HUSH_LOOPS
|
---|
| 7462 | if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */
|
---|
| 7463 | if (!for_lcur) {
|
---|
| 7464 | /* first loop through for */
|
---|
| 7465 |
|
---|
| 7466 | static const char encoded_dollar_at[] ALIGN1 = {
|
---|
| 7467 | SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0'
|
---|
| 7468 | }; /* encoded representation of "$@" */
|
---|
| 7469 | static const char *const encoded_dollar_at_argv[] = {
|
---|
| 7470 | encoded_dollar_at, NULL
|
---|
| 7471 | }; /* argv list with one element: "$@" */
|
---|
| 7472 | char **vals;
|
---|
| 7473 |
|
---|
| 7474 | vals = (char**)encoded_dollar_at_argv;
|
---|
| 7475 | if (pi->next->res_word == RES_IN) {
|
---|
| 7476 | /* if no variable values after "in" we skip "for" */
|
---|
| 7477 | if (!pi->next->cmds[0].argv) {
|
---|
| 7478 | G.last_exitcode = rcode = EXIT_SUCCESS;
|
---|
| 7479 | debug_printf_exec(": null FOR: exitcode EXIT_SUCCESS\n");
|
---|
| 7480 | break;
|
---|
| 7481 | }
|
---|
| 7482 | vals = pi->next->cmds[0].argv;
|
---|
| 7483 | } /* else: "for var; do..." -> assume "$@" list */
|
---|
| 7484 | /* create list of variable values */
|
---|
| 7485 | debug_print_strings("for_list made from", vals);
|
---|
| 7486 | for_list = expand_strvec_to_strvec(vals);
|
---|
| 7487 | for_lcur = for_list;
|
---|
| 7488 | debug_print_strings("for_list", for_list);
|
---|
[1765] | 7489 | }
|
---|
[2725] | 7490 | if (!*for_lcur) {
|
---|
| 7491 | /* "for" loop is over, clean up */
|
---|
| 7492 | free(for_list);
|
---|
| 7493 | for_list = NULL;
|
---|
| 7494 | for_lcur = NULL;
|
---|
| 7495 | break;
|
---|
[821] | 7496 | }
|
---|
[2725] | 7497 | /* Insert next value from for_lcur */
|
---|
| 7498 | /* note: *for_lcur already has quotes removed, $var expanded, etc */
|
---|
| 7499 | set_local_var(xasprintf("%s=%s", pi->cmds[0].argv[0], *for_lcur++), /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
---|
| 7500 | continue;
|
---|
| 7501 | }
|
---|
| 7502 | if (rword == RES_IN) {
|
---|
| 7503 | continue; /* "for v IN list;..." - "in" has no cmds anyway */
|
---|
| 7504 | }
|
---|
| 7505 | if (rword == RES_DONE) {
|
---|
| 7506 | continue; /* "done" has no cmds too */
|
---|
| 7507 | }
|
---|
[1765] | 7508 | #endif
|
---|
[2725] | 7509 | #if ENABLE_HUSH_CASE
|
---|
| 7510 | if (rword == RES_CASE) {
|
---|
| 7511 | case_word = expand_strvec_to_string(pi->cmds->argv);
|
---|
| 7512 | continue;
|
---|
| 7513 | }
|
---|
| 7514 | if (rword == RES_MATCH) {
|
---|
| 7515 | char **argv;
|
---|
| 7516 |
|
---|
| 7517 | if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */
|
---|
| 7518 | break;
|
---|
| 7519 | /* all prev words didn't match, does this one match? */
|
---|
| 7520 | argv = pi->cmds->argv;
|
---|
| 7521 | while (*argv) {
|
---|
| 7522 | char *pattern = expand_string_to_string(*argv, /*unbackslash:*/ 1);
|
---|
| 7523 | /* TODO: which FNM_xxx flags to use? */
|
---|
| 7524 | cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0);
|
---|
| 7525 | free(pattern);
|
---|
| 7526 | if (cond_code == 0) { /* match! we will execute this branch */
|
---|
| 7527 | free(case_word); /* make future "word)" stop */
|
---|
| 7528 | case_word = NULL;
|
---|
| 7529 | break;
|
---|
| 7530 | }
|
---|
| 7531 | argv++;
|
---|
[1765] | 7532 | }
|
---|
[2725] | 7533 | continue;
|
---|
| 7534 | }
|
---|
| 7535 | if (rword == RES_CASE_BODY) { /* inside of a case branch */
|
---|
| 7536 | if (cond_code != 0)
|
---|
| 7537 | continue; /* not matched yet, skip this pipe */
|
---|
| 7538 | }
|
---|
[1765] | 7539 | #endif
|
---|
[2725] | 7540 | /* Just pressing <enter> in shell should check for jobs.
|
---|
| 7541 | * OTOH, in non-interactive shell this is useless
|
---|
| 7542 | * and only leads to extra job checks */
|
---|
| 7543 | if (pi->num_cmds == 0) {
|
---|
| 7544 | if (G_interactive_fd)
|
---|
| 7545 | goto check_jobs_and_continue;
|
---|
| 7546 | continue;
|
---|
| 7547 | }
|
---|
| 7548 |
|
---|
| 7549 | /* After analyzing all keywords and conditions, we decided
|
---|
| 7550 | * to execute this pipe. NB: have to do checkjobs(NULL)
|
---|
| 7551 | * after run_pipe to collect any background children,
|
---|
| 7552 | * even if list execution is to be stopped. */
|
---|
| 7553 | debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds);
|
---|
| 7554 | {
|
---|
| 7555 | int r;
|
---|
| 7556 | #if ENABLE_HUSH_LOOPS
|
---|
| 7557 | G.flag_break_continue = 0;
|
---|
| 7558 | #endif
|
---|
| 7559 | rcode = r = run_pipe(pi); /* NB: rcode is a smallint */
|
---|
| 7560 | if (r != -1) {
|
---|
| 7561 | /* We ran a builtin, function, or group.
|
---|
| 7562 | * rcode is already known
|
---|
| 7563 | * and we don't need to wait for anything. */
|
---|
| 7564 | G.last_exitcode = rcode;
|
---|
| 7565 | debug_printf_exec(": builtin/func exitcode %d\n", rcode);
|
---|
[3232] | 7566 | check_and_run_traps();
|
---|
[2725] | 7567 | #if ENABLE_HUSH_LOOPS
|
---|
| 7568 | /* Was it "break" or "continue"? */
|
---|
| 7569 | if (G.flag_break_continue) {
|
---|
| 7570 | smallint fbc = G.flag_break_continue;
|
---|
| 7571 | /* We might fall into outer *loop*,
|
---|
| 7572 | * don't want to break it too */
|
---|
| 7573 | if (loop_top) {
|
---|
| 7574 | G.depth_break_continue--;
|
---|
| 7575 | if (G.depth_break_continue == 0)
|
---|
| 7576 | G.flag_break_continue = 0;
|
---|
| 7577 | /* else: e.g. "continue 2" should *break* once, *then* continue */
|
---|
| 7578 | } /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */
|
---|
[3621] | 7579 | if (G.depth_break_continue != 0 || fbc == BC_BREAK) {
|
---|
| 7580 | checkjobs(NULL);
|
---|
| 7581 | break;
|
---|
| 7582 | }
|
---|
[2725] | 7583 | /* "continue": simulate end of loop */
|
---|
| 7584 | rword = RES_DONE;
|
---|
| 7585 | continue;
|
---|
| 7586 | }
|
---|
| 7587 | #endif
|
---|
| 7588 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 7589 | if (G.flag_return_in_progress == 1) {
|
---|
| 7590 | checkjobs(NULL);
|
---|
| 7591 | break;
|
---|
| 7592 | }
|
---|
| 7593 | #endif
|
---|
| 7594 | } else if (pi->followup == PIPE_BG) {
|
---|
| 7595 | /* What does bash do with attempts to background builtins? */
|
---|
| 7596 | /* even bash 3.2 doesn't do that well with nested bg:
|
---|
| 7597 | * try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
|
---|
| 7598 | * I'm NOT treating inner &'s as jobs */
|
---|
[3232] | 7599 | check_and_run_traps();
|
---|
[2725] | 7600 | #if ENABLE_HUSH_JOB
|
---|
| 7601 | if (G.run_list_level == 1)
|
---|
| 7602 | insert_bg_job(pi);
|
---|
| 7603 | #endif
|
---|
| 7604 | /* Last command's pid goes to $! */
|
---|
| 7605 | G.last_bg_pid = pi->cmds[pi->num_cmds - 1].pid;
|
---|
| 7606 | G.last_exitcode = rcode = EXIT_SUCCESS;
|
---|
| 7607 | debug_printf_exec(": cmd&: exitcode EXIT_SUCCESS\n");
|
---|
[821] | 7608 | } else {
|
---|
[2725] | 7609 | #if ENABLE_HUSH_JOB
|
---|
| 7610 | if (G.run_list_level == 1 && G_interactive_fd) {
|
---|
| 7611 | /* Waits for completion, then fg's main shell */
|
---|
| 7612 | rcode = checkjobs_and_fg_shell(pi);
|
---|
| 7613 | debug_printf_exec(": checkjobs_and_fg_shell exitcode %d\n", rcode);
|
---|
[3232] | 7614 | check_and_run_traps();
|
---|
[2725] | 7615 | } else
|
---|
| 7616 | #endif
|
---|
| 7617 | { /* This one just waits for completion */
|
---|
| 7618 | rcode = checkjobs(pi);
|
---|
| 7619 | debug_printf_exec(": checkjobs exitcode %d\n", rcode);
|
---|
[3232] | 7620 | check_and_run_traps();
|
---|
[2725] | 7621 | }
|
---|
| 7622 | G.last_exitcode = rcode;
|
---|
[821] | 7623 | }
|
---|
[2725] | 7624 | }
|
---|
| 7625 |
|
---|
| 7626 | /* Analyze how result affects subsequent commands */
|
---|
| 7627 | #if ENABLE_HUSH_IF
|
---|
| 7628 | if (rword == RES_IF || rword == RES_ELIF)
|
---|
| 7629 | cond_code = rcode;
|
---|
| 7630 | #endif
|
---|
[3621] | 7631 | check_jobs_and_continue:
|
---|
| 7632 | checkjobs(NULL);
|
---|
| 7633 | dont_check_jobs_but_continue: ;
|
---|
[2725] | 7634 | #if ENABLE_HUSH_LOOPS
|
---|
| 7635 | /* Beware of "while false; true; do ..."! */
|
---|
[2859] | 7636 | if (pi->next
|
---|
| 7637 | && (pi->next->res_word == RES_DO || pi->next->res_word == RES_DONE)
|
---|
[3232] | 7638 | /* check for RES_DONE is needed for "while ...; do \n done" case */
|
---|
[2859] | 7639 | ) {
|
---|
[2725] | 7640 | if (rword == RES_WHILE) {
|
---|
| 7641 | if (rcode) {
|
---|
| 7642 | /* "while false; do...done" - exitcode 0 */
|
---|
| 7643 | G.last_exitcode = rcode = EXIT_SUCCESS;
|
---|
| 7644 | debug_printf_exec(": while expr is false: breaking (exitcode:EXIT_SUCCESS)\n");
|
---|
[3621] | 7645 | break;
|
---|
[2725] | 7646 | }
|
---|
[821] | 7647 | }
|
---|
[2725] | 7648 | if (rword == RES_UNTIL) {
|
---|
| 7649 | if (!rcode) {
|
---|
| 7650 | debug_printf_exec(": until expr is true: breaking\n");
|
---|
| 7651 | break;
|
---|
| 7652 | }
|
---|
[1765] | 7653 | }
|
---|
[821] | 7654 | }
|
---|
[2725] | 7655 | #endif
|
---|
| 7656 | } /* for (pi) */
|
---|
[821] | 7657 |
|
---|
[2725] | 7658 | #if ENABLE_HUSH_JOB
|
---|
| 7659 | G.run_list_level--;
|
---|
[1765] | 7660 | #endif
|
---|
[2725] | 7661 | #if ENABLE_HUSH_LOOPS
|
---|
| 7662 | if (loop_top)
|
---|
| 7663 | G.depth_of_loop--;
|
---|
| 7664 | free(for_list);
|
---|
[1765] | 7665 | #endif
|
---|
[2725] | 7666 | #if ENABLE_HUSH_CASE
|
---|
| 7667 | free(case_word);
|
---|
| 7668 | #endif
|
---|
| 7669 | debug_leave();
|
---|
| 7670 | debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level + 1, rcode);
|
---|
| 7671 | return rcode;
|
---|
[821] | 7672 | }
|
---|
| 7673 |
|
---|
[2725] | 7674 | /* Select which version we will use */
|
---|
| 7675 | static int run_and_free_list(struct pipe *pi)
|
---|
[821] | 7676 | {
|
---|
[2725] | 7677 | int rcode = 0;
|
---|
| 7678 | debug_printf_exec("run_and_free_list entered\n");
|
---|
[3232] | 7679 | if (!G.o_opt[OPT_O_NOEXEC]) {
|
---|
[2725] | 7680 | debug_printf_exec(": run_list: 1st pipe with %d cmds\n", pi->num_cmds);
|
---|
| 7681 | rcode = run_list(pi);
|
---|
| 7682 | }
|
---|
| 7683 | /* free_pipe_list has the side effect of clearing memory.
|
---|
| 7684 | * In the long run that function can be merged with run_list,
|
---|
| 7685 | * but doing that now would hobble the debugging effort. */
|
---|
| 7686 | free_pipe_list(pi);
|
---|
| 7687 | debug_printf_exec("run_and_free_list return %d\n", rcode);
|
---|
[821] | 7688 | return rcode;
|
---|
| 7689 | }
|
---|
| 7690 |
|
---|
[2725] | 7691 |
|
---|
[3232] | 7692 | static void install_sighandlers(unsigned mask)
|
---|
| 7693 | {
|
---|
| 7694 | sighandler_t old_handler;
|
---|
| 7695 | unsigned sig = 0;
|
---|
| 7696 | while ((mask >>= 1) != 0) {
|
---|
| 7697 | sig++;
|
---|
| 7698 | if (!(mask & 1))
|
---|
| 7699 | continue;
|
---|
| 7700 | old_handler = install_sighandler(sig, pick_sighandler(sig));
|
---|
| 7701 | /* POSIX allows shell to re-enable SIGCHLD
|
---|
| 7702 | * even if it was SIG_IGN on entry.
|
---|
| 7703 | * Therefore we skip IGN check for it:
|
---|
| 7704 | */
|
---|
| 7705 | if (sig == SIGCHLD)
|
---|
| 7706 | continue;
|
---|
| 7707 | if (old_handler == SIG_IGN) {
|
---|
| 7708 | /* oops... restore back to IGN, and record this fact */
|
---|
| 7709 | install_sighandler(sig, old_handler);
|
---|
| 7710 | if (!G.traps)
|
---|
| 7711 | G.traps = xzalloc(sizeof(G.traps[0]) * NSIG);
|
---|
| 7712 | free(G.traps[sig]);
|
---|
| 7713 | G.traps[sig] = xzalloc(1); /* == xstrdup(""); */
|
---|
| 7714 | }
|
---|
| 7715 | }
|
---|
| 7716 | }
|
---|
| 7717 |
|
---|
[2725] | 7718 | /* Called a few times only (or even once if "sh -c") */
|
---|
[3232] | 7719 | static void install_special_sighandlers(void)
|
---|
[821] | 7720 | {
|
---|
[2725] | 7721 | unsigned mask;
|
---|
[821] | 7722 |
|
---|
[3232] | 7723 | /* Which signals are shell-special? */
|
---|
| 7724 | mask = (1 << SIGQUIT) | (1 << SIGCHLD);
|
---|
[2725] | 7725 | if (G_interactive_fd) {
|
---|
[3232] | 7726 | mask |= SPECIAL_INTERACTIVE_SIGS;
|
---|
[2725] | 7727 | if (G_saved_tty_pgrp) /* we have ctty, job control sigs work */
|
---|
[3232] | 7728 | mask |= SPECIAL_JOBSTOP_SIGS;
|
---|
[1765] | 7729 | }
|
---|
[3232] | 7730 | /* Careful, do not re-install handlers we already installed */
|
---|
| 7731 | if (G.special_sig_mask != mask) {
|
---|
| 7732 | unsigned diff = mask & ~G.special_sig_mask;
|
---|
| 7733 | G.special_sig_mask = mask;
|
---|
| 7734 | install_sighandlers(diff);
|
---|
[2725] | 7735 | }
|
---|
[821] | 7736 | }
|
---|
[2725] | 7737 |
|
---|
| 7738 | #if ENABLE_HUSH_JOB
|
---|
| 7739 | /* helper */
|
---|
| 7740 | /* Set handlers to restore tty pgrp and exit */
|
---|
[3232] | 7741 | static void install_fatal_sighandlers(void)
|
---|
[2725] | 7742 | {
|
---|
[3232] | 7743 | unsigned mask;
|
---|
| 7744 |
|
---|
| 7745 | /* We will restore tty pgrp on these signals */
|
---|
| 7746 | mask = 0
|
---|
| 7747 | + (1 << SIGILL ) * HUSH_DEBUG
|
---|
| 7748 | + (1 << SIGFPE ) * HUSH_DEBUG
|
---|
| 7749 | + (1 << SIGBUS ) * HUSH_DEBUG
|
---|
| 7750 | + (1 << SIGSEGV) * HUSH_DEBUG
|
---|
| 7751 | + (1 << SIGTRAP) * HUSH_DEBUG
|
---|
| 7752 | + (1 << SIGABRT)
|
---|
[2725] | 7753 | /* bash 3.2 seems to handle these just like 'fatal' ones */
|
---|
[3232] | 7754 | + (1 << SIGPIPE)
|
---|
| 7755 | + (1 << SIGALRM)
|
---|
| 7756 | /* if we are interactive, SIGHUP, SIGTERM and SIGINT are special sigs.
|
---|
[2725] | 7757 | * if we aren't interactive... but in this case
|
---|
[3232] | 7758 | * we never want to restore pgrp on exit, and this fn is not called
|
---|
| 7759 | */
|
---|
| 7760 | /*+ (1 << SIGHUP )*/
|
---|
| 7761 | /*+ (1 << SIGTERM)*/
|
---|
| 7762 | /*+ (1 << SIGINT )*/
|
---|
| 7763 | ;
|
---|
| 7764 | G_fatal_sig_mask = mask;
|
---|
| 7765 |
|
---|
| 7766 | install_sighandlers(mask);
|
---|
[2725] | 7767 | }
|
---|
[1765] | 7768 | #endif
|
---|
[821] | 7769 |
|
---|
[2725] | 7770 | static int set_mode(int state, char mode, const char *o_opt)
|
---|
| 7771 | {
|
---|
| 7772 | int idx;
|
---|
| 7773 | switch (mode) {
|
---|
| 7774 | case 'n':
|
---|
[3232] | 7775 | G.o_opt[OPT_O_NOEXEC] = state;
|
---|
[2725] | 7776 | break;
|
---|
| 7777 | case 'x':
|
---|
| 7778 | IF_HUSH_MODE_X(G_x_mode = state;)
|
---|
| 7779 | break;
|
---|
| 7780 | case 'o':
|
---|
| 7781 | if (!o_opt) {
|
---|
| 7782 | /* "set -+o" without parameter.
|
---|
| 7783 | * in bash, set -o produces this output:
|
---|
| 7784 | * pipefail off
|
---|
| 7785 | * and set +o:
|
---|
| 7786 | * set +o pipefail
|
---|
| 7787 | * We always use the second form.
|
---|
| 7788 | */
|
---|
| 7789 | const char *p = o_opt_strings;
|
---|
| 7790 | idx = 0;
|
---|
| 7791 | while (*p) {
|
---|
| 7792 | printf("set %co %s\n", (G.o_opt[idx] ? '-' : '+'), p);
|
---|
| 7793 | idx++;
|
---|
| 7794 | p += strlen(p) + 1;
|
---|
| 7795 | }
|
---|
| 7796 | break;
|
---|
| 7797 | }
|
---|
| 7798 | idx = index_in_strings(o_opt_strings, o_opt);
|
---|
| 7799 | if (idx >= 0) {
|
---|
| 7800 | G.o_opt[idx] = state;
|
---|
| 7801 | break;
|
---|
| 7802 | }
|
---|
| 7803 | default:
|
---|
| 7804 | return EXIT_FAILURE;
|
---|
| 7805 | }
|
---|
| 7806 | return EXIT_SUCCESS;
|
---|
| 7807 | }
|
---|
| 7808 |
|
---|
| 7809 | int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
[821] | 7810 | int hush_main(int argc, char **argv)
|
---|
| 7811 | {
|
---|
[3232] | 7812 | enum {
|
---|
| 7813 | OPT_login = (1 << 0),
|
---|
| 7814 | };
|
---|
| 7815 | unsigned flags;
|
---|
[821] | 7816 | int opt;
|
---|
[2725] | 7817 | unsigned builtin_argc;
|
---|
[1765] | 7818 | char **e;
|
---|
| 7819 | struct variable *cur_var;
|
---|
[2725] | 7820 | struct variable *shell_ver;
|
---|
[821] | 7821 |
|
---|
[2725] | 7822 | INIT_G();
|
---|
[3232] | 7823 | if (EXIT_SUCCESS != 0) /* if EXIT_SUCCESS == 0, it is already done */
|
---|
[2725] | 7824 | G.last_exitcode = EXIT_SUCCESS;
|
---|
[3621] | 7825 |
|
---|
[3232] | 7826 | #if ENABLE_HUSH_FAST
|
---|
| 7827 | G.count_SIGCHLD++; /* ensure it is != G.handled_SIGCHLD */
|
---|
| 7828 | #endif
|
---|
[2725] | 7829 | #if !BB_MMU
|
---|
| 7830 | G.argv0_for_re_execing = argv[0];
|
---|
| 7831 | #endif
|
---|
[1765] | 7832 | /* Deal with HUSH_VERSION */
|
---|
[2725] | 7833 | shell_ver = xzalloc(sizeof(*shell_ver));
|
---|
| 7834 | shell_ver->flg_export = 1;
|
---|
| 7835 | shell_ver->flg_read_only = 1;
|
---|
| 7836 | /* Code which handles ${var<op>...} needs writable values for all variables,
|
---|
| 7837 | * therefore we xstrdup: */
|
---|
| 7838 | shell_ver->varstr = xstrdup(hush_version_str);
|
---|
| 7839 | /* Create shell local variables from the values
|
---|
| 7840 | * currently living in the environment */
|
---|
| 7841 | debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION");
|
---|
[1765] | 7842 | unsetenv("HUSH_VERSION"); /* in case it exists in initial env */
|
---|
[2725] | 7843 | G.top_var = shell_ver;
|
---|
| 7844 | cur_var = G.top_var;
|
---|
[1765] | 7845 | e = environ;
|
---|
| 7846 | if (e) while (*e) {
|
---|
| 7847 | char *value = strchr(*e, '=');
|
---|
| 7848 | if (value) { /* paranoia */
|
---|
| 7849 | cur_var->next = xzalloc(sizeof(*cur_var));
|
---|
| 7850 | cur_var = cur_var->next;
|
---|
| 7851 | cur_var->varstr = *e;
|
---|
| 7852 | cur_var->max_len = strlen(*e);
|
---|
| 7853 | cur_var->flg_export = 1;
|
---|
| 7854 | }
|
---|
| 7855 | e++;
|
---|
| 7856 | }
|
---|
[2725] | 7857 | /* (Re)insert HUSH_VERSION into env (AFTER we scanned the env!) */
|
---|
| 7858 | debug_printf_env("putenv '%s'\n", shell_ver->varstr);
|
---|
| 7859 | putenv(shell_ver->varstr);
|
---|
[1765] | 7860 |
|
---|
[2725] | 7861 | /* Export PWD */
|
---|
| 7862 | set_pwd_var(/*exp:*/ 1);
|
---|
[3621] | 7863 |
|
---|
| 7864 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
| 7865 | /* Set (but not export) HOSTNAME unless already set */
|
---|
| 7866 | if (!get_local_var_value("HOSTNAME")) {
|
---|
| 7867 | struct utsname uts;
|
---|
| 7868 | uname(&uts);
|
---|
| 7869 | set_local_var_from_halves("HOSTNAME", uts.nodename);
|
---|
| 7870 | }
|
---|
[2725] | 7871 | /* bash also exports SHLVL and _,
|
---|
| 7872 | * and sets (but doesn't export) the following variables:
|
---|
| 7873 | * BASH=/bin/bash
|
---|
| 7874 | * BASH_VERSINFO=([0]="3" [1]="2" [2]="0" [3]="1" [4]="release" [5]="i386-pc-linux-gnu")
|
---|
| 7875 | * BASH_VERSION='3.2.0(1)-release'
|
---|
| 7876 | * HOSTTYPE=i386
|
---|
| 7877 | * MACHTYPE=i386-pc-linux-gnu
|
---|
| 7878 | * OSTYPE=linux-gnu
|
---|
| 7879 | * PPID=<NNNNN> - we also do it elsewhere
|
---|
| 7880 | * EUID=<NNNNN>
|
---|
| 7881 | * UID=<NNNNN>
|
---|
| 7882 | * GROUPS=()
|
---|
| 7883 | * LINES=<NNN>
|
---|
| 7884 | * COLUMNS=<NNN>
|
---|
| 7885 | * BASH_ARGC=()
|
---|
| 7886 | * BASH_ARGV=()
|
---|
| 7887 | * BASH_LINENO=()
|
---|
| 7888 | * BASH_SOURCE=()
|
---|
| 7889 | * DIRSTACK=()
|
---|
| 7890 | * PIPESTATUS=([0]="0")
|
---|
| 7891 | * HISTFILE=/<xxx>/.bash_history
|
---|
| 7892 | * HISTFILESIZE=500
|
---|
| 7893 | * HISTSIZE=500
|
---|
| 7894 | * MAILCHECK=60
|
---|
| 7895 | * PATH=/usr/gnu/bin:/usr/local/bin:/bin:/usr/bin:.
|
---|
| 7896 | * SHELL=/bin/bash
|
---|
| 7897 | * SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor
|
---|
| 7898 | * TERM=dumb
|
---|
| 7899 | * OPTERR=1
|
---|
| 7900 | * OPTIND=1
|
---|
| 7901 | * IFS=$' \t\n'
|
---|
| 7902 | * PS1='\s-\v\$ '
|
---|
| 7903 | * PS2='> '
|
---|
| 7904 | * PS4='+ '
|
---|
| 7905 | */
|
---|
[3621] | 7906 | #endif
|
---|
[2725] | 7907 |
|
---|
[1765] | 7908 | #if ENABLE_FEATURE_EDITING
|
---|
[2725] | 7909 | G.line_input_state = new_line_input_t(FOR_SHELL);
|
---|
[1765] | 7910 | #endif
|
---|
[2725] | 7911 |
|
---|
[821] | 7912 | /* Initialize some more globals to non-zero values */
|
---|
[2725] | 7913 | cmdedit_update_prompt();
|
---|
[821] | 7914 |
|
---|
[3621] | 7915 | die_func = restore_ttypgrp_and__exit;
|
---|
[821] | 7916 |
|
---|
[2725] | 7917 | /* Shell is non-interactive at first. We need to call
|
---|
[3232] | 7918 | * install_special_sighandlers() if we are going to execute "sh <script>",
|
---|
[2725] | 7919 | * "sh -c <cmds>" or login shell's /etc/profile and friends.
|
---|
[3232] | 7920 | * If we later decide that we are interactive, we run install_special_sighandlers()
|
---|
[2725] | 7921 | * in order to intercept (more) signals.
|
---|
| 7922 | */
|
---|
| 7923 |
|
---|
| 7924 | /* Parse options */
|
---|
| 7925 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */
|
---|
[3232] | 7926 | flags = (argv[0] && argv[0][0] == '-') ? OPT_login : 0;
|
---|
[2725] | 7927 | builtin_argc = 0;
|
---|
| 7928 | while (1) {
|
---|
[3232] | 7929 | opt = getopt(argc, argv, "+c:xinsl"
|
---|
[2725] | 7930 | #if !BB_MMU
|
---|
| 7931 | "<:$:R:V:"
|
---|
| 7932 | # if ENABLE_HUSH_FUNCTIONS
|
---|
| 7933 | "F:"
|
---|
| 7934 | # endif
|
---|
| 7935 | #endif
|
---|
| 7936 | );
|
---|
| 7937 | if (opt <= 0)
|
---|
| 7938 | break;
|
---|
[821] | 7939 | switch (opt) {
|
---|
[1765] | 7940 | case 'c':
|
---|
[2725] | 7941 | /* Possibilities:
|
---|
| 7942 | * sh ... -c 'script'
|
---|
| 7943 | * sh ... -c 'script' ARG0 [ARG1...]
|
---|
| 7944 | * On NOMMU, if builtin_argc != 0,
|
---|
| 7945 | * sh ... -c 'builtin' BARGV... "" ARG0 [ARG1...]
|
---|
| 7946 | * "" needs to be replaced with NULL
|
---|
| 7947 | * and BARGV vector fed to builtin function.
|
---|
| 7948 | * Note: the form without ARG0 never happens:
|
---|
| 7949 | * sh ... -c 'builtin' BARGV... ""
|
---|
| 7950 | */
|
---|
| 7951 | if (!G.root_pid) {
|
---|
| 7952 | G.root_pid = getpid();
|
---|
| 7953 | G.root_ppid = getppid();
|
---|
| 7954 | }
|
---|
| 7955 | G.global_argv = argv + optind;
|
---|
| 7956 | G.global_argc = argc - optind;
|
---|
| 7957 | if (builtin_argc) {
|
---|
| 7958 | /* -c 'builtin' [BARGV...] "" ARG0 [ARG1...] */
|
---|
| 7959 | const struct built_in_command *x;
|
---|
| 7960 |
|
---|
[3232] | 7961 | install_special_sighandlers();
|
---|
[2725] | 7962 | x = find_builtin(optarg);
|
---|
| 7963 | if (x) { /* paranoia */
|
---|
| 7964 | G.global_argc -= builtin_argc; /* skip [BARGV...] "" */
|
---|
| 7965 | G.global_argv += builtin_argc;
|
---|
| 7966 | G.global_argv[-1] = NULL; /* replace "" */
|
---|
[3232] | 7967 | fflush_all();
|
---|
[2725] | 7968 | G.last_exitcode = x->b_function(argv + optind - 1);
|
---|
| 7969 | }
|
---|
| 7970 | goto final_return;
|
---|
| 7971 | }
|
---|
| 7972 | if (!G.global_argv[0]) {
|
---|
| 7973 | /* -c 'script' (no params): prevent empty $0 */
|
---|
| 7974 | G.global_argv--; /* points to argv[i] of 'script' */
|
---|
| 7975 | G.global_argv[0] = argv[0];
|
---|
| 7976 | G.global_argc++;
|
---|
| 7977 | } /* else -c 'script' ARG0 [ARG1...]: $0 is ARG0 */
|
---|
[3232] | 7978 | install_special_sighandlers();
|
---|
[2725] | 7979 | parse_and_run_string(optarg);
|
---|
[1765] | 7980 | goto final_return;
|
---|
| 7981 | case 'i':
|
---|
| 7982 | /* Well, we cannot just declare interactiveness,
|
---|
| 7983 | * we have to have some stuff (ctty, etc) */
|
---|
[2725] | 7984 | /* G_interactive_fd++; */
|
---|
[1765] | 7985 | break;
|
---|
[2725] | 7986 | case 's':
|
---|
| 7987 | /* "-s" means "read from stdin", but this is how we always
|
---|
| 7988 | * operate, so simply do nothing here. */
|
---|
[1765] | 7989 | break;
|
---|
[3232] | 7990 | case 'l':
|
---|
| 7991 | flags |= OPT_login;
|
---|
| 7992 | break;
|
---|
[2725] | 7993 | #if !BB_MMU
|
---|
| 7994 | case '<': /* "big heredoc" support */
|
---|
| 7995 | full_write1_str(optarg);
|
---|
| 7996 | _exit(0);
|
---|
| 7997 | case '$': {
|
---|
| 7998 | unsigned long long empty_trap_mask;
|
---|
| 7999 |
|
---|
| 8000 | G.root_pid = bb_strtou(optarg, &optarg, 16);
|
---|
| 8001 | optarg++;
|
---|
| 8002 | G.root_ppid = bb_strtou(optarg, &optarg, 16);
|
---|
| 8003 | optarg++;
|
---|
| 8004 | G.last_bg_pid = bb_strtou(optarg, &optarg, 16);
|
---|
| 8005 | optarg++;
|
---|
| 8006 | G.last_exitcode = bb_strtou(optarg, &optarg, 16);
|
---|
| 8007 | optarg++;
|
---|
| 8008 | builtin_argc = bb_strtou(optarg, &optarg, 16);
|
---|
| 8009 | optarg++;
|
---|
| 8010 | empty_trap_mask = bb_strtoull(optarg, &optarg, 16);
|
---|
| 8011 | if (empty_trap_mask != 0) {
|
---|
| 8012 | int sig;
|
---|
[3232] | 8013 | install_special_sighandlers();
|
---|
[2725] | 8014 | G.traps = xzalloc(sizeof(G.traps[0]) * NSIG);
|
---|
| 8015 | for (sig = 1; sig < NSIG; sig++) {
|
---|
| 8016 | if (empty_trap_mask & (1LL << sig)) {
|
---|
| 8017 | G.traps[sig] = xzalloc(1); /* == xstrdup(""); */
|
---|
[3232] | 8018 | install_sighandler(sig, SIG_IGN);
|
---|
[2725] | 8019 | }
|
---|
| 8020 | }
|
---|
| 8021 | }
|
---|
| 8022 | # if ENABLE_HUSH_LOOPS
|
---|
| 8023 | optarg++;
|
---|
| 8024 | G.depth_of_loop = bb_strtou(optarg, &optarg, 16);
|
---|
| 8025 | # endif
|
---|
| 8026 | break;
|
---|
| 8027 | }
|
---|
| 8028 | case 'R':
|
---|
| 8029 | case 'V':
|
---|
| 8030 | set_local_var(xstrdup(optarg), /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ opt == 'R');
|
---|
| 8031 | break;
|
---|
| 8032 | # if ENABLE_HUSH_FUNCTIONS
|
---|
| 8033 | case 'F': {
|
---|
| 8034 | struct function *funcp = new_function(optarg);
|
---|
| 8035 | /* funcp->name is already set to optarg */
|
---|
| 8036 | /* funcp->body is set to NULL. It's a special case. */
|
---|
| 8037 | funcp->body_as_string = argv[optind];
|
---|
| 8038 | optind++;
|
---|
| 8039 | break;
|
---|
| 8040 | }
|
---|
| 8041 | # endif
|
---|
| 8042 | #endif
|
---|
| 8043 | case 'n':
|
---|
| 8044 | case 'x':
|
---|
| 8045 | if (set_mode(1, opt, NULL) == 0) /* no error */
|
---|
| 8046 | break;
|
---|
[1765] | 8047 | default:
|
---|
[821] | 8048 | #ifndef BB_VER
|
---|
[1765] | 8049 | fprintf(stderr, "Usage: sh [FILE]...\n"
|
---|
| 8050 | " or: sh -c command [args]...\n\n");
|
---|
| 8051 | exit(EXIT_FAILURE);
|
---|
[821] | 8052 | #else
|
---|
[1765] | 8053 | bb_show_usage();
|
---|
[821] | 8054 | #endif
|
---|
| 8055 | }
|
---|
[2725] | 8056 | } /* option parsing loop */
|
---|
| 8057 |
|
---|
[3232] | 8058 | /* Skip options. Try "hush -l": $1 should not be "-l"! */
|
---|
| 8059 | G.global_argc = argc - (optind - 1);
|
---|
| 8060 | G.global_argv = argv + (optind - 1);
|
---|
| 8061 | G.global_argv[0] = argv[0];
|
---|
| 8062 |
|
---|
[2725] | 8063 | if (!G.root_pid) {
|
---|
| 8064 | G.root_pid = getpid();
|
---|
| 8065 | G.root_ppid = getppid();
|
---|
[821] | 8066 | }
|
---|
[2725] | 8067 |
|
---|
| 8068 | /* If we are login shell... */
|
---|
[3232] | 8069 | if (flags & OPT_login) {
|
---|
[2725] | 8070 | FILE *input;
|
---|
| 8071 | debug_printf("sourcing /etc/profile\n");
|
---|
| 8072 | input = fopen_for_read("/etc/profile");
|
---|
| 8073 | if (input != NULL) {
|
---|
| 8074 | close_on_exec_on(fileno(input));
|
---|
[3232] | 8075 | install_special_sighandlers();
|
---|
[2725] | 8076 | parse_and_run_file(input);
|
---|
| 8077 | fclose(input);
|
---|
| 8078 | }
|
---|
| 8079 | /* bash: after sourcing /etc/profile,
|
---|
| 8080 | * tries to source (in the given order):
|
---|
| 8081 | * ~/.bash_profile, ~/.bash_login, ~/.profile,
|
---|
| 8082 | * stopping on first found. --noprofile turns this off.
|
---|
| 8083 | * bash also sources ~/.bash_logout on exit.
|
---|
| 8084 | * If called as sh, skips .bash_XXX files.
|
---|
| 8085 | */
|
---|
| 8086 | }
|
---|
| 8087 |
|
---|
[3232] | 8088 | if (G.global_argv[1]) {
|
---|
[2725] | 8089 | FILE *input;
|
---|
| 8090 | /*
|
---|
| 8091 | * "bash <script>" (which is never interactive (unless -i?))
|
---|
| 8092 | * sources $BASH_ENV here (without scanning $PATH).
|
---|
| 8093 | * If called as sh, does the same but with $ENV.
|
---|
| 8094 | */
|
---|
[3232] | 8095 | G.global_argc--;
|
---|
| 8096 | G.global_argv++;
|
---|
| 8097 | debug_printf("running script '%s'\n", G.global_argv[0]);
|
---|
| 8098 | input = xfopen_for_read(G.global_argv[0]);
|
---|
[2725] | 8099 | close_on_exec_on(fileno(input));
|
---|
[3232] | 8100 | install_special_sighandlers();
|
---|
[2725] | 8101 | parse_and_run_file(input);
|
---|
| 8102 | #if ENABLE_FEATURE_CLEAN_UP
|
---|
| 8103 | fclose(input);
|
---|
| 8104 | #endif
|
---|
| 8105 | goto final_return;
|
---|
| 8106 | }
|
---|
| 8107 |
|
---|
| 8108 | /* Up to here, shell was non-interactive. Now it may become one.
|
---|
[3232] | 8109 | * NB: don't forget to (re)run install_special_sighandlers() as needed.
|
---|
[2725] | 8110 | */
|
---|
| 8111 |
|
---|
| 8112 | /* A shell is interactive if the '-i' flag was given,
|
---|
| 8113 | * or if all of the following conditions are met:
|
---|
[1765] | 8114 | * no -c command
|
---|
[821] | 8115 | * no arguments remaining or the -s flag given
|
---|
| 8116 | * standard input is a terminal
|
---|
| 8117 | * standard output is a terminal
|
---|
[2725] | 8118 | * Refer to Posix.2, the description of the 'sh' utility.
|
---|
| 8119 | */
|
---|
| 8120 | #if ENABLE_HUSH_JOB
|
---|
| 8121 | if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
|
---|
| 8122 | G_saved_tty_pgrp = tcgetpgrp(STDIN_FILENO);
|
---|
| 8123 | debug_printf("saved_tty_pgrp:%d\n", G_saved_tty_pgrp);
|
---|
| 8124 | if (G_saved_tty_pgrp < 0)
|
---|
| 8125 | G_saved_tty_pgrp = 0;
|
---|
| 8126 |
|
---|
| 8127 | /* try to dup stdin to high fd#, >= 255 */
|
---|
| 8128 | G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
|
---|
| 8129 | if (G_interactive_fd < 0) {
|
---|
| 8130 | /* try to dup to any fd */
|
---|
| 8131 | G_interactive_fd = dup(STDIN_FILENO);
|
---|
| 8132 | if (G_interactive_fd < 0) {
|
---|
| 8133 | /* give up */
|
---|
| 8134 | G_interactive_fd = 0;
|
---|
| 8135 | G_saved_tty_pgrp = 0;
|
---|
[1765] | 8136 | }
|
---|
| 8137 | }
|
---|
[2725] | 8138 | // TODO: track & disallow any attempts of user
|
---|
| 8139 | // to (inadvertently) close/redirect G_interactive_fd
|
---|
[821] | 8140 | }
|
---|
[2725] | 8141 | debug_printf("interactive_fd:%d\n", G_interactive_fd);
|
---|
| 8142 | if (G_interactive_fd) {
|
---|
| 8143 | close_on_exec_on(G_interactive_fd);
|
---|
| 8144 |
|
---|
| 8145 | if (G_saved_tty_pgrp) {
|
---|
| 8146 | /* If we were run as 'hush &', sleep until we are
|
---|
| 8147 | * in the foreground (tty pgrp == our pgrp).
|
---|
| 8148 | * If we get started under a job aware app (like bash),
|
---|
| 8149 | * make sure we are now in charge so we don't fight over
|
---|
| 8150 | * who gets the foreground */
|
---|
| 8151 | while (1) {
|
---|
| 8152 | pid_t shell_pgrp = getpgrp();
|
---|
| 8153 | G_saved_tty_pgrp = tcgetpgrp(G_interactive_fd);
|
---|
| 8154 | if (G_saved_tty_pgrp == shell_pgrp)
|
---|
| 8155 | break;
|
---|
| 8156 | /* send TTIN to ourself (should stop us) */
|
---|
| 8157 | kill(- shell_pgrp, SIGTTIN);
|
---|
| 8158 | }
|
---|
[1765] | 8159 | }
|
---|
[2725] | 8160 |
|
---|
[3232] | 8161 | /* Install more signal handlers */
|
---|
| 8162 | install_special_sighandlers();
|
---|
[2725] | 8163 |
|
---|
| 8164 | if (G_saved_tty_pgrp) {
|
---|
| 8165 | /* Set other signals to restore saved_tty_pgrp */
|
---|
[3232] | 8166 | install_fatal_sighandlers();
|
---|
[2725] | 8167 | /* Put ourselves in our own process group
|
---|
| 8168 | * (bash, too, does this only if ctty is available) */
|
---|
| 8169 | bb_setpgrp(); /* is the same as setpgid(our_pid, our_pid); */
|
---|
| 8170 | /* Grab control of the terminal */
|
---|
| 8171 | tcsetpgrp(G_interactive_fd, getpid());
|
---|
| 8172 | }
|
---|
[3621] | 8173 | enable_restore_tty_pgrp_on_exit();
|
---|
[3232] | 8174 |
|
---|
| 8175 | # if ENABLE_HUSH_SAVEHISTORY && MAX_HISTORY > 0
|
---|
| 8176 | {
|
---|
| 8177 | const char *hp = get_local_var_value("HISTFILE");
|
---|
| 8178 | if (!hp) {
|
---|
| 8179 | hp = get_local_var_value("HOME");
|
---|
| 8180 | if (hp)
|
---|
| 8181 | hp = concat_path_file(hp, ".hush_history");
|
---|
| 8182 | } else {
|
---|
| 8183 | hp = xstrdup(hp);
|
---|
| 8184 | }
|
---|
| 8185 | if (hp) {
|
---|
| 8186 | G.line_input_state->hist_file = hp;
|
---|
| 8187 | //set_local_var(xasprintf("HISTFILE=%s", ...));
|
---|
| 8188 | }
|
---|
| 8189 | # if ENABLE_FEATURE_SH_HISTFILESIZE
|
---|
| 8190 | hp = get_local_var_value("HISTFILESIZE");
|
---|
| 8191 | G.line_input_state->max_history = size_from_HISTFILESIZE(hp);
|
---|
| 8192 | # endif
|
---|
| 8193 | }
|
---|
| 8194 | # endif
|
---|
[2725] | 8195 | } else {
|
---|
[3232] | 8196 | install_special_sighandlers();
|
---|
[821] | 8197 | }
|
---|
[1765] | 8198 | #elif ENABLE_HUSH_INTERACTIVE
|
---|
[2725] | 8199 | /* No job control compiled in, only prompt/line editing */
|
---|
| 8200 | if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
|
---|
| 8201 | G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
|
---|
| 8202 | if (G_interactive_fd < 0) {
|
---|
[1765] | 8203 | /* try to dup to any fd */
|
---|
[2725] | 8204 | G_interactive_fd = dup(STDIN_FILENO);
|
---|
| 8205 | if (G_interactive_fd < 0)
|
---|
[1765] | 8206 | /* give up */
|
---|
[2725] | 8207 | G_interactive_fd = 0;
|
---|
[1765] | 8208 | }
|
---|
| 8209 | }
|
---|
[2725] | 8210 | if (G_interactive_fd) {
|
---|
| 8211 | close_on_exec_on(G_interactive_fd);
|
---|
| 8212 | }
|
---|
[3232] | 8213 | install_special_sighandlers();
|
---|
[2725] | 8214 | #else
|
---|
| 8215 | /* We have interactiveness code disabled */
|
---|
[3232] | 8216 | install_special_sighandlers();
|
---|
[1765] | 8217 | #endif
|
---|
[2725] | 8218 | /* bash:
|
---|
| 8219 | * if interactive but not a login shell, sources ~/.bashrc
|
---|
| 8220 | * (--norc turns this off, --rcfile <file> overrides)
|
---|
| 8221 | */
|
---|
[1765] | 8222 |
|
---|
[2725] | 8223 | if (!ENABLE_FEATURE_SH_EXTRA_QUIET && G_interactive_fd) {
|
---|
| 8224 | /* note: ash and hush share this string */
|
---|
| 8225 | printf("\n\n%s %s\n"
|
---|
| 8226 | IF_HUSH_HELP("Enter 'help' for a list of built-in commands.\n")
|
---|
| 8227 | "\n",
|
---|
| 8228 | bb_banner,
|
---|
| 8229 | "hush - the humble shell"
|
---|
| 8230 | );
|
---|
[821] | 8231 | }
|
---|
| 8232 |
|
---|
[2725] | 8233 | parse_and_run_file(stdin);
|
---|
[821] | 8234 |
|
---|
[1765] | 8235 | final_return:
|
---|
[2725] | 8236 | hush_exit(G.last_exitcode);
|
---|
| 8237 | }
|
---|
[1765] | 8238 |
|
---|
[2725] | 8239 |
|
---|
| 8240 | #if ENABLE_MSH
|
---|
| 8241 | int msh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 8242 | int msh_main(int argc, char **argv)
|
---|
| 8243 | {
|
---|
| 8244 | //bb_error_msg("msh is deprecated, please use hush instead");
|
---|
| 8245 | return hush_main(argc, argv);
|
---|
| 8246 | }
|
---|
| 8247 | #endif
|
---|
| 8248 |
|
---|
| 8249 |
|
---|
| 8250 | /*
|
---|
| 8251 | * Built-ins
|
---|
| 8252 | */
|
---|
| 8253 | static int FAST_FUNC builtin_true(char **argv UNUSED_PARAM)
|
---|
| 8254 | {
|
---|
| 8255 | return 0;
|
---|
| 8256 | }
|
---|
| 8257 |
|
---|
| 8258 | static int run_applet_main(char **argv, int (*applet_main_func)(int argc, char **argv))
|
---|
| 8259 | {
|
---|
| 8260 | int argc = 0;
|
---|
| 8261 | while (*argv) {
|
---|
| 8262 | argc++;
|
---|
| 8263 | argv++;
|
---|
| 8264 | }
|
---|
| 8265 | return applet_main_func(argc, argv - argc);
|
---|
| 8266 | }
|
---|
| 8267 |
|
---|
| 8268 | static int FAST_FUNC builtin_test(char **argv)
|
---|
| 8269 | {
|
---|
| 8270 | return run_applet_main(argv, test_main);
|
---|
| 8271 | }
|
---|
| 8272 |
|
---|
| 8273 | static int FAST_FUNC builtin_echo(char **argv)
|
---|
| 8274 | {
|
---|
| 8275 | return run_applet_main(argv, echo_main);
|
---|
| 8276 | }
|
---|
| 8277 |
|
---|
| 8278 | #if ENABLE_PRINTF
|
---|
| 8279 | static int FAST_FUNC builtin_printf(char **argv)
|
---|
| 8280 | {
|
---|
| 8281 | return run_applet_main(argv, printf_main);
|
---|
| 8282 | }
|
---|
| 8283 | #endif
|
---|
| 8284 |
|
---|
| 8285 | static char **skip_dash_dash(char **argv)
|
---|
| 8286 | {
|
---|
| 8287 | argv++;
|
---|
| 8288 | if (argv[0] && argv[0][0] == '-' && argv[0][1] == '-' && argv[0][2] == '\0')
|
---|
| 8289 | argv++;
|
---|
| 8290 | return argv;
|
---|
| 8291 | }
|
---|
| 8292 |
|
---|
| 8293 | static int FAST_FUNC builtin_eval(char **argv)
|
---|
| 8294 | {
|
---|
| 8295 | int rcode = EXIT_SUCCESS;
|
---|
| 8296 |
|
---|
| 8297 | argv = skip_dash_dash(argv);
|
---|
| 8298 | if (*argv) {
|
---|
| 8299 | char *str = expand_strvec_to_string(argv);
|
---|
| 8300 | /* bash:
|
---|
| 8301 | * eval "echo Hi; done" ("done" is syntax error):
|
---|
| 8302 | * "echo Hi" will not execute too.
|
---|
| 8303 | */
|
---|
| 8304 | parse_and_run_string(str);
|
---|
| 8305 | free(str);
|
---|
| 8306 | rcode = G.last_exitcode;
|
---|
| 8307 | }
|
---|
| 8308 | return rcode;
|
---|
| 8309 | }
|
---|
| 8310 |
|
---|
| 8311 | static int FAST_FUNC builtin_cd(char **argv)
|
---|
| 8312 | {
|
---|
| 8313 | const char *newdir;
|
---|
| 8314 |
|
---|
| 8315 | argv = skip_dash_dash(argv);
|
---|
| 8316 | newdir = argv[0];
|
---|
| 8317 | if (newdir == NULL) {
|
---|
| 8318 | /* bash does nothing (exitcode 0) if HOME is ""; if it's unset,
|
---|
| 8319 | * bash says "bash: cd: HOME not set" and does nothing
|
---|
| 8320 | * (exitcode 1)
|
---|
| 8321 | */
|
---|
| 8322 | const char *home = get_local_var_value("HOME");
|
---|
| 8323 | newdir = home ? home : "/";
|
---|
| 8324 | }
|
---|
| 8325 | if (chdir(newdir)) {
|
---|
| 8326 | /* Mimic bash message exactly */
|
---|
| 8327 | bb_perror_msg("cd: %s", newdir);
|
---|
| 8328 | return EXIT_FAILURE;
|
---|
| 8329 | }
|
---|
| 8330 | /* Read current dir (get_cwd(1) is inside) and set PWD.
|
---|
| 8331 | * Note: do not enforce exporting. If PWD was unset or unexported,
|
---|
| 8332 | * set it again, but do not export. bash does the same.
|
---|
| 8333 | */
|
---|
| 8334 | set_pwd_var(/*exp:*/ 0);
|
---|
| 8335 | return EXIT_SUCCESS;
|
---|
| 8336 | }
|
---|
| 8337 |
|
---|
| 8338 | static int FAST_FUNC builtin_exec(char **argv)
|
---|
| 8339 | {
|
---|
| 8340 | argv = skip_dash_dash(argv);
|
---|
| 8341 | if (argv[0] == NULL)
|
---|
| 8342 | return EXIT_SUCCESS; /* bash does this */
|
---|
| 8343 |
|
---|
| 8344 | /* Careful: we can end up here after [v]fork. Do not restore
|
---|
| 8345 | * tty pgrp then, only top-level shell process does that */
|
---|
| 8346 | if (G_saved_tty_pgrp && getpid() == G.root_pid)
|
---|
| 8347 | tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp);
|
---|
| 8348 |
|
---|
| 8349 | /* TODO: if exec fails, bash does NOT exit! We do.
|
---|
[3232] | 8350 | * We'll need to undo trap cleanup (it's inside execvp_or_die)
|
---|
[2725] | 8351 | * and tcsetpgrp, and this is inherently racy.
|
---|
| 8352 | */
|
---|
| 8353 | execvp_or_die(argv);
|
---|
| 8354 | }
|
---|
| 8355 |
|
---|
| 8356 | static int FAST_FUNC builtin_exit(char **argv)
|
---|
| 8357 | {
|
---|
| 8358 | debug_printf_exec("%s()\n", __func__);
|
---|
| 8359 |
|
---|
| 8360 | /* interactive bash:
|
---|
| 8361 | * # trap "echo EEE" EXIT
|
---|
| 8362 | * # exit
|
---|
| 8363 | * exit
|
---|
| 8364 | * There are stopped jobs.
|
---|
| 8365 | * (if there are _stopped_ jobs, running ones don't count)
|
---|
| 8366 | * # exit
|
---|
| 8367 | * exit
|
---|
[3232] | 8368 | * EEE (then bash exits)
|
---|
[2725] | 8369 | *
|
---|
| 8370 | * TODO: we can use G.exiting = -1 as indicator "last cmd was exit"
|
---|
| 8371 | */
|
---|
| 8372 |
|
---|
| 8373 | /* note: EXIT trap is run by hush_exit */
|
---|
| 8374 | argv = skip_dash_dash(argv);
|
---|
| 8375 | if (argv[0] == NULL)
|
---|
| 8376 | hush_exit(G.last_exitcode);
|
---|
| 8377 | /* mimic bash: exit 123abc == exit 255 + error msg */
|
---|
| 8378 | xfunc_error_retval = 255;
|
---|
| 8379 | /* bash: exit -2 == exit 254, no error msg */
|
---|
| 8380 | hush_exit(xatoi(argv[0]) & 0xff);
|
---|
| 8381 | }
|
---|
| 8382 |
|
---|
| 8383 | static void print_escaped(const char *s)
|
---|
| 8384 | {
|
---|
| 8385 | if (*s == '\'')
|
---|
| 8386 | goto squote;
|
---|
| 8387 | do {
|
---|
| 8388 | const char *p = strchrnul(s, '\'');
|
---|
| 8389 | /* print 'xxxx', possibly just '' */
|
---|
| 8390 | printf("'%.*s'", (int)(p - s), s);
|
---|
| 8391 | if (*p == '\0')
|
---|
| 8392 | break;
|
---|
| 8393 | s = p;
|
---|
| 8394 | squote:
|
---|
| 8395 | /* s points to '; print "'''...'''" */
|
---|
| 8396 | putchar('"');
|
---|
| 8397 | do putchar('\''); while (*++s == '\'');
|
---|
| 8398 | putchar('"');
|
---|
| 8399 | } while (*s);
|
---|
| 8400 | }
|
---|
| 8401 |
|
---|
| 8402 | #if !ENABLE_HUSH_LOCAL
|
---|
| 8403 | #define helper_export_local(argv, exp, lvl) \
|
---|
| 8404 | helper_export_local(argv, exp)
|
---|
| 8405 | #endif
|
---|
| 8406 | static void helper_export_local(char **argv, int exp, int lvl)
|
---|
| 8407 | {
|
---|
| 8408 | do {
|
---|
| 8409 | char *name = *argv;
|
---|
| 8410 | char *name_end = strchrnul(name, '=');
|
---|
| 8411 |
|
---|
| 8412 | /* So far we do not check that name is valid (TODO?) */
|
---|
| 8413 |
|
---|
| 8414 | if (*name_end == '\0') {
|
---|
| 8415 | struct variable *var, **vpp;
|
---|
| 8416 |
|
---|
| 8417 | vpp = get_ptr_to_local_var(name, name_end - name);
|
---|
| 8418 | var = vpp ? *vpp : NULL;
|
---|
| 8419 |
|
---|
| 8420 | if (exp == -1) { /* unexporting? */
|
---|
| 8421 | /* export -n NAME (without =VALUE) */
|
---|
| 8422 | if (var) {
|
---|
| 8423 | var->flg_export = 0;
|
---|
| 8424 | debug_printf_env("%s: unsetenv '%s'\n", __func__, name);
|
---|
| 8425 | unsetenv(name);
|
---|
| 8426 | } /* else: export -n NOT_EXISTING_VAR: no-op */
|
---|
| 8427 | continue;
|
---|
| 8428 | }
|
---|
| 8429 | if (exp == 1) { /* exporting? */
|
---|
| 8430 | /* export NAME (without =VALUE) */
|
---|
| 8431 | if (var) {
|
---|
| 8432 | var->flg_export = 1;
|
---|
| 8433 | debug_printf_env("%s: putenv '%s'\n", __func__, var->varstr);
|
---|
| 8434 | putenv(var->varstr);
|
---|
| 8435 | continue;
|
---|
| 8436 | }
|
---|
| 8437 | }
|
---|
| 8438 | /* Exporting non-existing variable.
|
---|
| 8439 | * bash does not put it in environment,
|
---|
| 8440 | * but remembers that it is exported,
|
---|
| 8441 | * and does put it in env when it is set later.
|
---|
| 8442 | * We just set it to "" and export. */
|
---|
| 8443 | /* Or, it's "local NAME" (without =VALUE).
|
---|
| 8444 | * bash sets the value to "". */
|
---|
| 8445 | name = xasprintf("%s=", name);
|
---|
| 8446 | } else {
|
---|
| 8447 | /* (Un)exporting/making local NAME=VALUE */
|
---|
| 8448 | name = xstrdup(name);
|
---|
| 8449 | }
|
---|
| 8450 | set_local_var(name, /*exp:*/ exp, /*lvl:*/ lvl, /*ro:*/ 0);
|
---|
| 8451 | } while (*++argv);
|
---|
| 8452 | }
|
---|
| 8453 |
|
---|
| 8454 | static int FAST_FUNC builtin_export(char **argv)
|
---|
| 8455 | {
|
---|
| 8456 | unsigned opt_unexport;
|
---|
| 8457 |
|
---|
| 8458 | #if ENABLE_HUSH_EXPORT_N
|
---|
| 8459 | /* "!": do not abort on errors */
|
---|
| 8460 | opt_unexport = getopt32(argv, "!n");
|
---|
| 8461 | if (opt_unexport == (uint32_t)-1)
|
---|
| 8462 | return EXIT_FAILURE;
|
---|
| 8463 | argv += optind;
|
---|
| 8464 | #else
|
---|
| 8465 | opt_unexport = 0;
|
---|
| 8466 | argv++;
|
---|
| 8467 | #endif
|
---|
| 8468 |
|
---|
| 8469 | if (argv[0] == NULL) {
|
---|
| 8470 | char **e = environ;
|
---|
| 8471 | if (e) {
|
---|
| 8472 | while (*e) {
|
---|
| 8473 | #if 0
|
---|
| 8474 | puts(*e++);
|
---|
| 8475 | #else
|
---|
| 8476 | /* ash emits: export VAR='VAL'
|
---|
| 8477 | * bash: declare -x VAR="VAL"
|
---|
| 8478 | * we follow ash example */
|
---|
| 8479 | const char *s = *e++;
|
---|
| 8480 | const char *p = strchr(s, '=');
|
---|
| 8481 |
|
---|
| 8482 | if (!p) /* wtf? take next variable */
|
---|
| 8483 | continue;
|
---|
| 8484 | /* export var= */
|
---|
| 8485 | printf("export %.*s", (int)(p - s) + 1, s);
|
---|
| 8486 | print_escaped(p + 1);
|
---|
| 8487 | putchar('\n');
|
---|
| 8488 | #endif
|
---|
| 8489 | }
|
---|
| 8490 | /*fflush_all(); - done after each builtin anyway */
|
---|
| 8491 | }
|
---|
| 8492 | return EXIT_SUCCESS;
|
---|
| 8493 | }
|
---|
| 8494 |
|
---|
| 8495 | helper_export_local(argv, (opt_unexport ? -1 : 1), 0);
|
---|
| 8496 |
|
---|
| 8497 | return EXIT_SUCCESS;
|
---|
| 8498 | }
|
---|
| 8499 |
|
---|
| 8500 | #if ENABLE_HUSH_LOCAL
|
---|
| 8501 | static int FAST_FUNC builtin_local(char **argv)
|
---|
| 8502 | {
|
---|
| 8503 | if (G.func_nest_level == 0) {
|
---|
| 8504 | bb_error_msg("%s: not in a function", argv[0]);
|
---|
| 8505 | return EXIT_FAILURE; /* bash compat */
|
---|
| 8506 | }
|
---|
| 8507 | helper_export_local(argv, 0, G.func_nest_level);
|
---|
| 8508 | return EXIT_SUCCESS;
|
---|
| 8509 | }
|
---|
| 8510 | #endif
|
---|
| 8511 |
|
---|
| 8512 | static int FAST_FUNC builtin_trap(char **argv)
|
---|
| 8513 | {
|
---|
| 8514 | int sig;
|
---|
| 8515 | char *new_cmd;
|
---|
| 8516 |
|
---|
| 8517 | if (!G.traps)
|
---|
| 8518 | G.traps = xzalloc(sizeof(G.traps[0]) * NSIG);
|
---|
| 8519 |
|
---|
| 8520 | argv++;
|
---|
| 8521 | if (!*argv) {
|
---|
| 8522 | int i;
|
---|
| 8523 | /* No args: print all trapped */
|
---|
| 8524 | for (i = 0; i < NSIG; ++i) {
|
---|
| 8525 | if (G.traps[i]) {
|
---|
| 8526 | printf("trap -- ");
|
---|
| 8527 | print_escaped(G.traps[i]);
|
---|
| 8528 | /* note: bash adds "SIG", but only if invoked
|
---|
| 8529 | * as "bash". If called as "sh", or if set -o posix,
|
---|
| 8530 | * then it prints short signal names.
|
---|
| 8531 | * We are printing short names: */
|
---|
| 8532 | printf(" %s\n", get_signame(i));
|
---|
| 8533 | }
|
---|
| 8534 | }
|
---|
| 8535 | /*fflush_all(); - done after each builtin anyway */
|
---|
| 8536 | return EXIT_SUCCESS;
|
---|
| 8537 | }
|
---|
| 8538 |
|
---|
| 8539 | new_cmd = NULL;
|
---|
| 8540 | /* If first arg is a number: reset all specified signals */
|
---|
| 8541 | sig = bb_strtou(*argv, NULL, 10);
|
---|
| 8542 | if (errno == 0) {
|
---|
| 8543 | int ret;
|
---|
| 8544 | process_sig_list:
|
---|
| 8545 | ret = EXIT_SUCCESS;
|
---|
| 8546 | while (*argv) {
|
---|
[3232] | 8547 | sighandler_t handler;
|
---|
| 8548 |
|
---|
[2725] | 8549 | sig = get_signum(*argv++);
|
---|
| 8550 | if (sig < 0 || sig >= NSIG) {
|
---|
| 8551 | ret = EXIT_FAILURE;
|
---|
| 8552 | /* Mimic bash message exactly */
|
---|
| 8553 | bb_perror_msg("trap: %s: invalid signal specification", argv[-1]);
|
---|
| 8554 | continue;
|
---|
| 8555 | }
|
---|
| 8556 |
|
---|
| 8557 | free(G.traps[sig]);
|
---|
| 8558 | G.traps[sig] = xstrdup(new_cmd);
|
---|
| 8559 |
|
---|
| 8560 | debug_printf("trap: setting SIG%s (%i) to '%s'\n",
|
---|
| 8561 | get_signame(sig), sig, G.traps[sig]);
|
---|
| 8562 |
|
---|
| 8563 | /* There is no signal for 0 (EXIT) */
|
---|
| 8564 | if (sig == 0)
|
---|
| 8565 | continue;
|
---|
| 8566 |
|
---|
[3232] | 8567 | if (new_cmd)
|
---|
| 8568 | handler = (new_cmd[0] ? record_pending_signo : SIG_IGN);
|
---|
| 8569 | else
|
---|
| 8570 | /* We are removing trap handler */
|
---|
| 8571 | handler = pick_sighandler(sig);
|
---|
| 8572 | install_sighandler(sig, handler);
|
---|
[2725] | 8573 | }
|
---|
| 8574 | return ret;
|
---|
| 8575 | }
|
---|
| 8576 |
|
---|
| 8577 | if (!argv[1]) { /* no second arg */
|
---|
| 8578 | bb_error_msg("trap: invalid arguments");
|
---|
| 8579 | return EXIT_FAILURE;
|
---|
| 8580 | }
|
---|
| 8581 |
|
---|
| 8582 | /* First arg is "-": reset all specified to default */
|
---|
| 8583 | /* First arg is "--": skip it, the rest is "handler SIGs..." */
|
---|
| 8584 | /* Everything else: set arg as signal handler
|
---|
| 8585 | * (includes "" case, which ignores signal) */
|
---|
| 8586 | if (argv[0][0] == '-') {
|
---|
| 8587 | if (argv[0][1] == '\0') { /* "-" */
|
---|
| 8588 | /* new_cmd remains NULL: "reset these sigs" */
|
---|
| 8589 | goto reset_traps;
|
---|
| 8590 | }
|
---|
| 8591 | if (argv[0][1] == '-' && argv[0][2] == '\0') { /* "--" */
|
---|
| 8592 | argv++;
|
---|
| 8593 | }
|
---|
| 8594 | /* else: "-something", no special meaning */
|
---|
| 8595 | }
|
---|
| 8596 | new_cmd = *argv;
|
---|
| 8597 | reset_traps:
|
---|
| 8598 | argv++;
|
---|
| 8599 | goto process_sig_list;
|
---|
| 8600 | }
|
---|
| 8601 |
|
---|
| 8602 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/type.html */
|
---|
| 8603 | static int FAST_FUNC builtin_type(char **argv)
|
---|
| 8604 | {
|
---|
| 8605 | int ret = EXIT_SUCCESS;
|
---|
| 8606 |
|
---|
| 8607 | while (*++argv) {
|
---|
| 8608 | const char *type;
|
---|
| 8609 | char *path = NULL;
|
---|
| 8610 |
|
---|
| 8611 | if (0) {} /* make conditional compile easier below */
|
---|
| 8612 | /*else if (find_alias(*argv))
|
---|
| 8613 | type = "an alias";*/
|
---|
| 8614 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 8615 | else if (find_function(*argv))
|
---|
| 8616 | type = "a function";
|
---|
| 8617 | #endif
|
---|
| 8618 | else if (find_builtin(*argv))
|
---|
| 8619 | type = "a shell builtin";
|
---|
| 8620 | else if ((path = find_in_path(*argv)) != NULL)
|
---|
| 8621 | type = path;
|
---|
| 8622 | else {
|
---|
| 8623 | bb_error_msg("type: %s: not found", *argv);
|
---|
| 8624 | ret = EXIT_FAILURE;
|
---|
| 8625 | continue;
|
---|
| 8626 | }
|
---|
| 8627 |
|
---|
| 8628 | printf("%s is %s\n", *argv, type);
|
---|
| 8629 | free(path);
|
---|
| 8630 | }
|
---|
| 8631 |
|
---|
| 8632 | return ret;
|
---|
| 8633 | }
|
---|
| 8634 |
|
---|
| 8635 | #if ENABLE_HUSH_JOB
|
---|
| 8636 | /* built-in 'fg' and 'bg' handler */
|
---|
| 8637 | static int FAST_FUNC builtin_fg_bg(char **argv)
|
---|
| 8638 | {
|
---|
| 8639 | int i, jobnum;
|
---|
| 8640 | struct pipe *pi;
|
---|
| 8641 |
|
---|
| 8642 | if (!G_interactive_fd)
|
---|
| 8643 | return EXIT_FAILURE;
|
---|
| 8644 |
|
---|
| 8645 | /* If they gave us no args, assume they want the last backgrounded task */
|
---|
| 8646 | if (!argv[1]) {
|
---|
| 8647 | for (pi = G.job_list; pi; pi = pi->next) {
|
---|
| 8648 | if (pi->jobid == G.last_jobid) {
|
---|
| 8649 | goto found;
|
---|
| 8650 | }
|
---|
| 8651 | }
|
---|
| 8652 | bb_error_msg("%s: no current job", argv[0]);
|
---|
| 8653 | return EXIT_FAILURE;
|
---|
| 8654 | }
|
---|
| 8655 | if (sscanf(argv[1], "%%%d", &jobnum) != 1) {
|
---|
| 8656 | bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]);
|
---|
| 8657 | return EXIT_FAILURE;
|
---|
| 8658 | }
|
---|
| 8659 | for (pi = G.job_list; pi; pi = pi->next) {
|
---|
| 8660 | if (pi->jobid == jobnum) {
|
---|
| 8661 | goto found;
|
---|
| 8662 | }
|
---|
| 8663 | }
|
---|
| 8664 | bb_error_msg("%s: %d: no such job", argv[0], jobnum);
|
---|
| 8665 | return EXIT_FAILURE;
|
---|
| 8666 | found:
|
---|
| 8667 | /* TODO: bash prints a string representation
|
---|
| 8668 | * of job being foregrounded (like "sleep 1 | cat") */
|
---|
| 8669 | if (argv[0][0] == 'f' && G_saved_tty_pgrp) {
|
---|
| 8670 | /* Put the job into the foreground. */
|
---|
| 8671 | tcsetpgrp(G_interactive_fd, pi->pgrp);
|
---|
| 8672 | }
|
---|
| 8673 |
|
---|
| 8674 | /* Restart the processes in the job */
|
---|
| 8675 | debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_cmds, pi->pgrp);
|
---|
| 8676 | for (i = 0; i < pi->num_cmds; i++) {
|
---|
| 8677 | debug_printf_jobs("reviving pid %d\n", pi->cmds[i].pid);
|
---|
| 8678 | }
|
---|
| 8679 | pi->stopped_cmds = 0;
|
---|
| 8680 |
|
---|
| 8681 | i = kill(- pi->pgrp, SIGCONT);
|
---|
| 8682 | if (i < 0) {
|
---|
| 8683 | if (errno == ESRCH) {
|
---|
| 8684 | delete_finished_bg_job(pi);
|
---|
| 8685 | return EXIT_SUCCESS;
|
---|
| 8686 | }
|
---|
| 8687 | bb_perror_msg("kill (SIGCONT)");
|
---|
| 8688 | }
|
---|
| 8689 |
|
---|
| 8690 | if (argv[0][0] == 'f') {
|
---|
| 8691 | remove_bg_job(pi);
|
---|
| 8692 | return checkjobs_and_fg_shell(pi);
|
---|
| 8693 | }
|
---|
| 8694 | return EXIT_SUCCESS;
|
---|
| 8695 | }
|
---|
| 8696 | #endif
|
---|
| 8697 |
|
---|
| 8698 | #if ENABLE_HUSH_HELP
|
---|
| 8699 | static int FAST_FUNC builtin_help(char **argv UNUSED_PARAM)
|
---|
| 8700 | {
|
---|
| 8701 | const struct built_in_command *x;
|
---|
| 8702 |
|
---|
| 8703 | printf(
|
---|
| 8704 | "Built-in commands:\n"
|
---|
| 8705 | "------------------\n");
|
---|
| 8706 | for (x = bltins1; x != &bltins1[ARRAY_SIZE(bltins1)]; x++) {
|
---|
| 8707 | if (x->b_descr)
|
---|
| 8708 | printf("%-10s%s\n", x->b_cmd, x->b_descr);
|
---|
| 8709 | }
|
---|
| 8710 | bb_putchar('\n');
|
---|
| 8711 | return EXIT_SUCCESS;
|
---|
| 8712 | }
|
---|
| 8713 | #endif
|
---|
| 8714 |
|
---|
[3621] | 8715 | #if MAX_HISTORY && ENABLE_FEATURE_EDITING
|
---|
| 8716 | static int FAST_FUNC builtin_history(char **argv UNUSED_PARAM)
|
---|
| 8717 | {
|
---|
| 8718 | show_history(G.line_input_state);
|
---|
| 8719 | return EXIT_SUCCESS;
|
---|
| 8720 | }
|
---|
| 8721 | #endif
|
---|
| 8722 |
|
---|
[2725] | 8723 | #if ENABLE_HUSH_JOB
|
---|
| 8724 | static int FAST_FUNC builtin_jobs(char **argv UNUSED_PARAM)
|
---|
| 8725 | {
|
---|
| 8726 | struct pipe *job;
|
---|
| 8727 | const char *status_string;
|
---|
| 8728 |
|
---|
| 8729 | for (job = G.job_list; job; job = job->next) {
|
---|
| 8730 | if (job->alive_cmds == job->stopped_cmds)
|
---|
| 8731 | status_string = "Stopped";
|
---|
| 8732 | else
|
---|
| 8733 | status_string = "Running";
|
---|
| 8734 |
|
---|
| 8735 | printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
|
---|
| 8736 | }
|
---|
| 8737 | return EXIT_SUCCESS;
|
---|
| 8738 | }
|
---|
| 8739 | #endif
|
---|
| 8740 |
|
---|
| 8741 | #if HUSH_DEBUG
|
---|
| 8742 | static int FAST_FUNC builtin_memleak(char **argv UNUSED_PARAM)
|
---|
| 8743 | {
|
---|
| 8744 | void *p;
|
---|
| 8745 | unsigned long l;
|
---|
| 8746 |
|
---|
| 8747 | # ifdef M_TRIM_THRESHOLD
|
---|
| 8748 | /* Optional. Reduces probability of false positives */
|
---|
| 8749 | malloc_trim(0);
|
---|
| 8750 | # endif
|
---|
| 8751 | /* Crude attempt to find where "free memory" starts,
|
---|
| 8752 | * sans fragmentation. */
|
---|
| 8753 | p = malloc(240);
|
---|
| 8754 | l = (unsigned long)p;
|
---|
| 8755 | free(p);
|
---|
| 8756 | p = malloc(3400);
|
---|
| 8757 | if (l < (unsigned long)p) l = (unsigned long)p;
|
---|
| 8758 | free(p);
|
---|
| 8759 |
|
---|
| 8760 | if (!G.memleak_value)
|
---|
| 8761 | G.memleak_value = l;
|
---|
| 8762 |
|
---|
| 8763 | l -= G.memleak_value;
|
---|
| 8764 | if ((long)l < 0)
|
---|
| 8765 | l = 0;
|
---|
| 8766 | l /= 1024;
|
---|
| 8767 | if (l > 127)
|
---|
| 8768 | l = 127;
|
---|
| 8769 |
|
---|
| 8770 | /* Exitcode is "how many kilobytes we leaked since 1st call" */
|
---|
| 8771 | return l;
|
---|
| 8772 | }
|
---|
| 8773 | #endif
|
---|
| 8774 |
|
---|
| 8775 | static int FAST_FUNC builtin_pwd(char **argv UNUSED_PARAM)
|
---|
| 8776 | {
|
---|
| 8777 | puts(get_cwd(0));
|
---|
| 8778 | return EXIT_SUCCESS;
|
---|
| 8779 | }
|
---|
| 8780 |
|
---|
[3232] | 8781 | /* Interruptibility of read builtin in bash
|
---|
| 8782 | * (tested on bash-4.2.8 by sending signals (not by ^C)):
|
---|
| 8783 | *
|
---|
| 8784 | * Empty trap makes read ignore corresponding signal, for any signal.
|
---|
| 8785 | *
|
---|
| 8786 | * SIGINT:
|
---|
| 8787 | * - terminates non-interactive shell;
|
---|
| 8788 | * - interrupts read in interactive shell;
|
---|
| 8789 | * if it has non-empty trap:
|
---|
| 8790 | * - executes trap and returns to command prompt in interactive shell;
|
---|
| 8791 | * - executes trap and returns to read in non-interactive shell;
|
---|
| 8792 | * SIGTERM:
|
---|
| 8793 | * - is ignored (does not interrupt) read in interactive shell;
|
---|
| 8794 | * - terminates non-interactive shell;
|
---|
| 8795 | * if it has non-empty trap:
|
---|
| 8796 | * - executes trap and returns to read;
|
---|
| 8797 | * SIGHUP:
|
---|
| 8798 | * - terminates shell (regardless of interactivity);
|
---|
| 8799 | * if it has non-empty trap:
|
---|
| 8800 | * - executes trap and returns to read;
|
---|
| 8801 | */
|
---|
[2725] | 8802 | static int FAST_FUNC builtin_read(char **argv)
|
---|
| 8803 | {
|
---|
| 8804 | const char *r;
|
---|
| 8805 | char *opt_n = NULL;
|
---|
| 8806 | char *opt_p = NULL;
|
---|
| 8807 | char *opt_t = NULL;
|
---|
| 8808 | char *opt_u = NULL;
|
---|
[3232] | 8809 | const char *ifs;
|
---|
[2725] | 8810 | int read_flags;
|
---|
| 8811 |
|
---|
| 8812 | /* "!": do not abort on errors.
|
---|
| 8813 | * Option string must start with "sr" to match BUILTIN_READ_xxx
|
---|
| 8814 | */
|
---|
| 8815 | read_flags = getopt32(argv, "!srn:p:t:u:", &opt_n, &opt_p, &opt_t, &opt_u);
|
---|
| 8816 | if (read_flags == (uint32_t)-1)
|
---|
| 8817 | return EXIT_FAILURE;
|
---|
| 8818 | argv += optind;
|
---|
[3232] | 8819 | ifs = get_local_var_value("IFS"); /* can be NULL */
|
---|
[2725] | 8820 |
|
---|
[3232] | 8821 | again:
|
---|
[2725] | 8822 | r = shell_builtin_read(set_local_var_from_halves,
|
---|
| 8823 | argv,
|
---|
[3232] | 8824 | ifs,
|
---|
[2725] | 8825 | read_flags,
|
---|
| 8826 | opt_n,
|
---|
| 8827 | opt_p,
|
---|
| 8828 | opt_t,
|
---|
| 8829 | opt_u
|
---|
| 8830 | );
|
---|
| 8831 |
|
---|
[3232] | 8832 | if ((uintptr_t)r == 1 && errno == EINTR) {
|
---|
| 8833 | unsigned sig = check_and_run_traps();
|
---|
| 8834 | if (sig && sig != SIGINT)
|
---|
| 8835 | goto again;
|
---|
| 8836 | }
|
---|
| 8837 |
|
---|
[2725] | 8838 | if ((uintptr_t)r > 1) {
|
---|
| 8839 | bb_error_msg("%s", r);
|
---|
| 8840 | r = (char*)(uintptr_t)1;
|
---|
| 8841 | }
|
---|
| 8842 |
|
---|
| 8843 | return (uintptr_t)r;
|
---|
| 8844 | }
|
---|
| 8845 |
|
---|
| 8846 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set
|
---|
| 8847 | * built-in 'set' handler
|
---|
| 8848 | * SUSv3 says:
|
---|
| 8849 | * set [-abCefhmnuvx] [-o option] [argument...]
|
---|
| 8850 | * set [+abCefhmnuvx] [+o option] [argument...]
|
---|
| 8851 | * set -- [argument...]
|
---|
| 8852 | * set -o
|
---|
| 8853 | * set +o
|
---|
| 8854 | * Implementations shall support the options in both their hyphen and
|
---|
| 8855 | * plus-sign forms. These options can also be specified as options to sh.
|
---|
| 8856 | * Examples:
|
---|
| 8857 | * Write out all variables and their values: set
|
---|
| 8858 | * Set $1, $2, and $3 and set "$#" to 3: set c a b
|
---|
| 8859 | * Turn on the -x and -v options: set -xv
|
---|
| 8860 | * Unset all positional parameters: set --
|
---|
| 8861 | * Set $1 to the value of x, even if it begins with '-' or '+': set -- "$x"
|
---|
| 8862 | * Set the positional parameters to the expansion of x, even if x expands
|
---|
| 8863 | * with a leading '-' or '+': set -- $x
|
---|
| 8864 | *
|
---|
| 8865 | * So far, we only support "set -- [argument...]" and some of the short names.
|
---|
| 8866 | */
|
---|
| 8867 | static int FAST_FUNC builtin_set(char **argv)
|
---|
| 8868 | {
|
---|
| 8869 | int n;
|
---|
| 8870 | char **pp, **g_argv;
|
---|
| 8871 | char *arg = *++argv;
|
---|
| 8872 |
|
---|
| 8873 | if (arg == NULL) {
|
---|
| 8874 | struct variable *e;
|
---|
| 8875 | for (e = G.top_var; e; e = e->next)
|
---|
| 8876 | puts(e->varstr);
|
---|
| 8877 | return EXIT_SUCCESS;
|
---|
| 8878 | }
|
---|
| 8879 |
|
---|
| 8880 | do {
|
---|
| 8881 | if (strcmp(arg, "--") == 0) {
|
---|
| 8882 | ++argv;
|
---|
| 8883 | goto set_argv;
|
---|
| 8884 | }
|
---|
| 8885 | if (arg[0] != '+' && arg[0] != '-')
|
---|
| 8886 | break;
|
---|
| 8887 | for (n = 1; arg[n]; ++n) {
|
---|
| 8888 | if (set_mode((arg[0] == '-'), arg[n], argv[1]))
|
---|
| 8889 | goto error;
|
---|
| 8890 | if (arg[n] == 'o' && argv[1])
|
---|
| 8891 | argv++;
|
---|
| 8892 | }
|
---|
| 8893 | } while ((arg = *++argv) != NULL);
|
---|
| 8894 | /* Now argv[0] is 1st argument */
|
---|
| 8895 |
|
---|
| 8896 | if (arg == NULL)
|
---|
| 8897 | return EXIT_SUCCESS;
|
---|
| 8898 | set_argv:
|
---|
| 8899 |
|
---|
| 8900 | /* NB: G.global_argv[0] ($0) is never freed/changed */
|
---|
| 8901 | g_argv = G.global_argv;
|
---|
| 8902 | if (G.global_args_malloced) {
|
---|
| 8903 | pp = g_argv;
|
---|
| 8904 | while (*++pp)
|
---|
| 8905 | free(*pp);
|
---|
| 8906 | g_argv[1] = NULL;
|
---|
| 8907 | } else {
|
---|
| 8908 | G.global_args_malloced = 1;
|
---|
| 8909 | pp = xzalloc(sizeof(pp[0]) * 2);
|
---|
| 8910 | pp[0] = g_argv[0]; /* retain $0 */
|
---|
| 8911 | g_argv = pp;
|
---|
| 8912 | }
|
---|
| 8913 | /* This realloc's G.global_argv */
|
---|
| 8914 | G.global_argv = pp = add_strings_to_strings(g_argv, argv, /*dup:*/ 1);
|
---|
| 8915 |
|
---|
| 8916 | n = 1;
|
---|
| 8917 | while (*++pp)
|
---|
| 8918 | n++;
|
---|
| 8919 | G.global_argc = n;
|
---|
| 8920 |
|
---|
| 8921 | return EXIT_SUCCESS;
|
---|
| 8922 |
|
---|
| 8923 | /* Nothing known, so abort */
|
---|
| 8924 | error:
|
---|
| 8925 | bb_error_msg("set: %s: invalid option", arg);
|
---|
| 8926 | return EXIT_FAILURE;
|
---|
| 8927 | }
|
---|
| 8928 |
|
---|
| 8929 | static int FAST_FUNC builtin_shift(char **argv)
|
---|
| 8930 | {
|
---|
| 8931 | int n = 1;
|
---|
| 8932 | argv = skip_dash_dash(argv);
|
---|
| 8933 | if (argv[0]) {
|
---|
| 8934 | n = atoi(argv[0]);
|
---|
| 8935 | }
|
---|
| 8936 | if (n >= 0 && n < G.global_argc) {
|
---|
| 8937 | if (G.global_args_malloced) {
|
---|
| 8938 | int m = 1;
|
---|
| 8939 | while (m <= n)
|
---|
| 8940 | free(G.global_argv[m++]);
|
---|
| 8941 | }
|
---|
| 8942 | G.global_argc -= n;
|
---|
| 8943 | memmove(&G.global_argv[1], &G.global_argv[n+1],
|
---|
| 8944 | G.global_argc * sizeof(G.global_argv[0]));
|
---|
| 8945 | return EXIT_SUCCESS;
|
---|
| 8946 | }
|
---|
| 8947 | return EXIT_FAILURE;
|
---|
| 8948 | }
|
---|
| 8949 |
|
---|
| 8950 | static int FAST_FUNC builtin_source(char **argv)
|
---|
| 8951 | {
|
---|
| 8952 | char *arg_path, *filename;
|
---|
| 8953 | FILE *input;
|
---|
| 8954 | save_arg_t sv;
|
---|
| 8955 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 8956 | smallint sv_flg;
|
---|
| 8957 | #endif
|
---|
| 8958 |
|
---|
| 8959 | argv = skip_dash_dash(argv);
|
---|
| 8960 | filename = argv[0];
|
---|
| 8961 | if (!filename) {
|
---|
| 8962 | /* bash says: "bash: .: filename argument required" */
|
---|
| 8963 | return 2; /* bash compat */
|
---|
| 8964 | }
|
---|
| 8965 | arg_path = NULL;
|
---|
| 8966 | if (!strchr(filename, '/')) {
|
---|
| 8967 | arg_path = find_in_path(filename);
|
---|
| 8968 | if (arg_path)
|
---|
| 8969 | filename = arg_path;
|
---|
| 8970 | }
|
---|
| 8971 | input = fopen_or_warn(filename, "r");
|
---|
| 8972 | free(arg_path);
|
---|
| 8973 | if (!input) {
|
---|
| 8974 | /* bb_perror_msg("%s", *argv); - done by fopen_or_warn */
|
---|
[3621] | 8975 | /* POSIX: non-interactive shell should abort here,
|
---|
| 8976 | * not merely fail. So far no one complained :)
|
---|
| 8977 | */
|
---|
[2725] | 8978 | return EXIT_FAILURE;
|
---|
| 8979 | }
|
---|
| 8980 | close_on_exec_on(fileno(input));
|
---|
| 8981 |
|
---|
| 8982 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 8983 | sv_flg = G.flag_return_in_progress;
|
---|
| 8984 | /* "we are inside sourced file, ok to use return" */
|
---|
| 8985 | G.flag_return_in_progress = -1;
|
---|
| 8986 | #endif
|
---|
[3621] | 8987 | if (argv[1])
|
---|
| 8988 | save_and_replace_G_args(&sv, argv);
|
---|
[2725] | 8989 |
|
---|
| 8990 | parse_and_run_file(input);
|
---|
[821] | 8991 | fclose(input);
|
---|
[2725] | 8992 |
|
---|
[3621] | 8993 | if (argv[1])
|
---|
| 8994 | restore_G_args(&sv, argv);
|
---|
[2725] | 8995 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 8996 | G.flag_return_in_progress = sv_flg;
|
---|
| 8997 | #endif
|
---|
| 8998 |
|
---|
| 8999 | return G.last_exitcode;
|
---|
| 9000 | }
|
---|
| 9001 |
|
---|
| 9002 | static int FAST_FUNC builtin_umask(char **argv)
|
---|
| 9003 | {
|
---|
| 9004 | int rc;
|
---|
| 9005 | mode_t mask;
|
---|
| 9006 |
|
---|
[3621] | 9007 | rc = 1;
|
---|
[2725] | 9008 | mask = umask(0);
|
---|
| 9009 | argv = skip_dash_dash(argv);
|
---|
| 9010 | if (argv[0]) {
|
---|
| 9011 | mode_t old_mask = mask;
|
---|
| 9012 |
|
---|
[3621] | 9013 | /* numeric umasks are taken as-is */
|
---|
| 9014 | /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */
|
---|
| 9015 | if (!isdigit(argv[0][0]))
|
---|
| 9016 | mask ^= 0777;
|
---|
| 9017 | mask = bb_parse_mode(argv[0], mask);
|
---|
| 9018 | if (!isdigit(argv[0][0]))
|
---|
| 9019 | mask ^= 0777;
|
---|
| 9020 | if ((unsigned)mask > 0777) {
|
---|
[2725] | 9021 | mask = old_mask;
|
---|
| 9022 | /* bash messages:
|
---|
| 9023 | * bash: umask: 'q': invalid symbolic mode operator
|
---|
| 9024 | * bash: umask: 999: octal number out of range
|
---|
| 9025 | */
|
---|
| 9026 | bb_error_msg("%s: invalid mode '%s'", "umask", argv[0]);
|
---|
[3621] | 9027 | rc = 0;
|
---|
[2725] | 9028 | }
|
---|
| 9029 | } else {
|
---|
| 9030 | /* Mimic bash */
|
---|
| 9031 | printf("%04o\n", (unsigned) mask);
|
---|
| 9032 | /* fall through and restore mask which we set to 0 */
|
---|
[821] | 9033 | }
|
---|
[2725] | 9034 | umask(mask);
|
---|
| 9035 |
|
---|
| 9036 | return !rc; /* rc != 0 - success */
|
---|
| 9037 | }
|
---|
| 9038 |
|
---|
| 9039 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#unset */
|
---|
| 9040 | static int FAST_FUNC builtin_unset(char **argv)
|
---|
| 9041 | {
|
---|
| 9042 | int ret;
|
---|
| 9043 | unsigned opts;
|
---|
| 9044 |
|
---|
| 9045 | /* "!": do not abort on errors */
|
---|
| 9046 | /* "+": stop at 1st non-option */
|
---|
| 9047 | opts = getopt32(argv, "!+vf");
|
---|
| 9048 | if (opts == (unsigned)-1)
|
---|
| 9049 | return EXIT_FAILURE;
|
---|
| 9050 | if (opts == 3) {
|
---|
| 9051 | bb_error_msg("unset: -v and -f are exclusive");
|
---|
| 9052 | return EXIT_FAILURE;
|
---|
| 9053 | }
|
---|
| 9054 | argv += optind;
|
---|
| 9055 |
|
---|
| 9056 | ret = EXIT_SUCCESS;
|
---|
| 9057 | while (*argv) {
|
---|
| 9058 | if (!(opts & 2)) { /* not -f */
|
---|
| 9059 | if (unset_local_var(*argv)) {
|
---|
| 9060 | /* unset <nonexistent_var> doesn't fail.
|
---|
| 9061 | * Error is when one tries to unset RO var.
|
---|
| 9062 | * Message was printed by unset_local_var. */
|
---|
| 9063 | ret = EXIT_FAILURE;
|
---|
| 9064 | }
|
---|
| 9065 | }
|
---|
| 9066 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 9067 | else {
|
---|
| 9068 | unset_func(*argv);
|
---|
| 9069 | }
|
---|
[821] | 9070 | #endif
|
---|
[2725] | 9071 | argv++;
|
---|
| 9072 | }
|
---|
| 9073 | return ret;
|
---|
[821] | 9074 | }
|
---|
[2725] | 9075 |
|
---|
| 9076 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/wait.html */
|
---|
| 9077 | static int FAST_FUNC builtin_wait(char **argv)
|
---|
| 9078 | {
|
---|
| 9079 | int ret = EXIT_SUCCESS;
|
---|
[3232] | 9080 | int status;
|
---|
[2725] | 9081 |
|
---|
| 9082 | argv = skip_dash_dash(argv);
|
---|
| 9083 | if (argv[0] == NULL) {
|
---|
| 9084 | /* Don't care about wait results */
|
---|
| 9085 | /* Note 1: must wait until there are no more children */
|
---|
| 9086 | /* Note 2: must be interruptible */
|
---|
| 9087 | /* Examples:
|
---|
| 9088 | * $ sleep 3 & sleep 6 & wait
|
---|
| 9089 | * [1] 30934 sleep 3
|
---|
| 9090 | * [2] 30935 sleep 6
|
---|
| 9091 | * [1] Done sleep 3
|
---|
| 9092 | * [2] Done sleep 6
|
---|
| 9093 | * $ sleep 3 & sleep 6 & wait
|
---|
| 9094 | * [1] 30936 sleep 3
|
---|
| 9095 | * [2] 30937 sleep 6
|
---|
| 9096 | * [1] Done sleep 3
|
---|
| 9097 | * ^C <-- after ~4 sec from keyboard
|
---|
| 9098 | * $
|
---|
| 9099 | */
|
---|
| 9100 | while (1) {
|
---|
[3232] | 9101 | int sig;
|
---|
| 9102 | sigset_t oldset, allsigs;
|
---|
| 9103 |
|
---|
| 9104 | /* waitpid is not interruptible by SA_RESTARTed
|
---|
| 9105 | * signals which we use. Thus, this ugly dance:
|
---|
| 9106 | */
|
---|
| 9107 |
|
---|
| 9108 | /* Make sure possible SIGCHLD is stored in kernel's
|
---|
| 9109 | * pending signal mask before we call waitpid.
|
---|
| 9110 | * Or else we may race with SIGCHLD, lose it,
|
---|
| 9111 | * and get stuck in sigwaitinfo...
|
---|
| 9112 | */
|
---|
| 9113 | sigfillset(&allsigs);
|
---|
| 9114 | sigprocmask(SIG_SETMASK, &allsigs, &oldset);
|
---|
| 9115 |
|
---|
| 9116 | if (!sigisemptyset(&G.pending_set)) {
|
---|
| 9117 | /* Crap! we raced with some signal! */
|
---|
| 9118 | // sig = 0;
|
---|
| 9119 | goto restore;
|
---|
| 9120 | }
|
---|
| 9121 |
|
---|
| 9122 | checkjobs(NULL); /* waitpid(WNOHANG) inside */
|
---|
| 9123 | if (errno == ECHILD) {
|
---|
| 9124 | sigprocmask(SIG_SETMASK, &oldset, NULL);
|
---|
[2725] | 9125 | break;
|
---|
| 9126 | }
|
---|
[3232] | 9127 |
|
---|
| 9128 | /* Wait for SIGCHLD or any other signal */
|
---|
| 9129 | //sig = sigwaitinfo(&allsigs, NULL);
|
---|
| 9130 | /* It is vitally important for sigsuspend that SIGCHLD has non-DFL handler! */
|
---|
| 9131 | /* Note: sigsuspend invokes signal handler */
|
---|
| 9132 | sigsuspend(&oldset);
|
---|
| 9133 | restore:
|
---|
| 9134 | sigprocmask(SIG_SETMASK, &oldset, NULL);
|
---|
| 9135 |
|
---|
| 9136 | /* So, did we get a signal? */
|
---|
| 9137 | //if (sig > 0)
|
---|
| 9138 | // raise(sig); /* run handler */
|
---|
| 9139 | sig = check_and_run_traps();
|
---|
| 9140 | if (sig /*&& sig != SIGCHLD - always true */) {
|
---|
| 9141 | /* see note 2 */
|
---|
| 9142 | ret = 128 + sig;
|
---|
| 9143 | break;
|
---|
| 9144 | }
|
---|
| 9145 | /* SIGCHLD, or no signal, or ignored one, such as SIGQUIT. Repeat */
|
---|
[2725] | 9146 | }
|
---|
| 9147 | return ret;
|
---|
| 9148 | }
|
---|
| 9149 |
|
---|
| 9150 | /* This is probably buggy wrt interruptible-ness */
|
---|
| 9151 | while (*argv) {
|
---|
| 9152 | pid_t pid = bb_strtou(*argv, NULL, 10);
|
---|
| 9153 | if (errno) {
|
---|
| 9154 | /* mimic bash message */
|
---|
| 9155 | bb_error_msg("wait: '%s': not a pid or valid job spec", *argv);
|
---|
| 9156 | return EXIT_FAILURE;
|
---|
| 9157 | }
|
---|
| 9158 | if (waitpid(pid, &status, 0) == pid) {
|
---|
[3621] | 9159 | ret = WEXITSTATUS(status);
|
---|
[2725] | 9160 | if (WIFSIGNALED(status))
|
---|
| 9161 | ret = 128 + WTERMSIG(status);
|
---|
| 9162 | } else {
|
---|
| 9163 | bb_perror_msg("wait %s", *argv);
|
---|
| 9164 | ret = 127;
|
---|
| 9165 | }
|
---|
| 9166 | argv++;
|
---|
| 9167 | }
|
---|
| 9168 |
|
---|
| 9169 | return ret;
|
---|
| 9170 | }
|
---|
| 9171 |
|
---|
| 9172 | #if ENABLE_HUSH_LOOPS || ENABLE_HUSH_FUNCTIONS
|
---|
| 9173 | static unsigned parse_numeric_argv1(char **argv, unsigned def, unsigned def_min)
|
---|
| 9174 | {
|
---|
| 9175 | if (argv[1]) {
|
---|
| 9176 | def = bb_strtou(argv[1], NULL, 10);
|
---|
| 9177 | if (errno || def < def_min || argv[2]) {
|
---|
| 9178 | bb_error_msg("%s: bad arguments", argv[0]);
|
---|
| 9179 | def = UINT_MAX;
|
---|
| 9180 | }
|
---|
| 9181 | }
|
---|
| 9182 | return def;
|
---|
| 9183 | }
|
---|
| 9184 | #endif
|
---|
| 9185 |
|
---|
| 9186 | #if ENABLE_HUSH_LOOPS
|
---|
| 9187 | static int FAST_FUNC builtin_break(char **argv)
|
---|
| 9188 | {
|
---|
| 9189 | unsigned depth;
|
---|
| 9190 | if (G.depth_of_loop == 0) {
|
---|
| 9191 | bb_error_msg("%s: only meaningful in a loop", argv[0]);
|
---|
| 9192 | return EXIT_SUCCESS; /* bash compat */
|
---|
| 9193 | }
|
---|
| 9194 | G.flag_break_continue++; /* BC_BREAK = 1 */
|
---|
| 9195 |
|
---|
| 9196 | G.depth_break_continue = depth = parse_numeric_argv1(argv, 1, 1);
|
---|
| 9197 | if (depth == UINT_MAX)
|
---|
| 9198 | G.flag_break_continue = BC_BREAK;
|
---|
| 9199 | if (G.depth_of_loop < depth)
|
---|
| 9200 | G.depth_break_continue = G.depth_of_loop;
|
---|
| 9201 |
|
---|
| 9202 | return EXIT_SUCCESS;
|
---|
| 9203 | }
|
---|
| 9204 |
|
---|
| 9205 | static int FAST_FUNC builtin_continue(char **argv)
|
---|
| 9206 | {
|
---|
| 9207 | G.flag_break_continue = 1; /* BC_CONTINUE = 2 = 1+1 */
|
---|
| 9208 | return builtin_break(argv);
|
---|
| 9209 | }
|
---|
| 9210 | #endif
|
---|
| 9211 |
|
---|
| 9212 | #if ENABLE_HUSH_FUNCTIONS
|
---|
| 9213 | static int FAST_FUNC builtin_return(char **argv)
|
---|
| 9214 | {
|
---|
| 9215 | int rc;
|
---|
| 9216 |
|
---|
| 9217 | if (G.flag_return_in_progress != -1) {
|
---|
| 9218 | bb_error_msg("%s: not in a function or sourced script", argv[0]);
|
---|
| 9219 | return EXIT_FAILURE; /* bash compat */
|
---|
| 9220 | }
|
---|
| 9221 |
|
---|
| 9222 | G.flag_return_in_progress = 1;
|
---|
| 9223 |
|
---|
| 9224 | /* bash:
|
---|
| 9225 | * out of range: wraps around at 256, does not error out
|
---|
| 9226 | * non-numeric param:
|
---|
| 9227 | * f() { false; return qwe; }; f; echo $?
|
---|
| 9228 | * bash: return: qwe: numeric argument required <== we do this
|
---|
| 9229 | * 255 <== we also do this
|
---|
| 9230 | */
|
---|
| 9231 | rc = parse_numeric_argv1(argv, G.last_exitcode, 0);
|
---|
| 9232 | return rc;
|
---|
| 9233 | }
|
---|
| 9234 | #endif
|
---|