1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * A prototype Bourne shell grammar parser.
|
---|
4 | * Intended to follow the original Thompson and Ritchie
|
---|
5 | * "small and simple is beautiful" philosophy, which
|
---|
6 | * incidentally is a good match to today's BusyBox.
|
---|
7 | *
|
---|
8 | * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
|
---|
9 | * Copyright (C) 2008,2009 Denys Vlasenko <vda.linux@googlemail.com>
|
---|
10 | *
|
---|
11 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
12 | *
|
---|
13 | * Credits:
|
---|
14 | * The parser routines proper are all original material, first
|
---|
15 | * written Dec 2000 and Jan 2001 by Larry Doolittle. The
|
---|
16 | * execution engine, the builtins, and much of the underlying
|
---|
17 | * support has been adapted from busybox-0.49pre's lash, which is
|
---|
18 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
---|
19 | * written by Erik Andersen <andersen@codepoet.org>. That, in turn,
|
---|
20 | * is based in part on ladsh.c, by Michael K. Johnson and Erik W.
|
---|
21 | * Troan, which they placed in the public domain. I don't know
|
---|
22 | * how much of the Johnson/Troan code has survived the repeated
|
---|
23 | * rewrites.
|
---|
24 | *
|
---|
25 | * Other credits:
|
---|
26 | * o_addchr derived from similar w_addchar function in glibc-2.2.
|
---|
27 | * parse_redirect, redirect_opt_num, and big chunks of main
|
---|
28 | * and many builtins derived from contributions by Erik Andersen.
|
---|
29 | * Miscellaneous bugfixes from Matt Kraai.
|
---|
30 | *
|
---|
31 | * There are two big (and related) architecture differences between
|
---|
32 | * this parser and the lash parser. One is that this version is
|
---|
33 | * actually designed from the ground up to understand nearly all
|
---|
34 | * of the Bourne grammar. The second, consequential change is that
|
---|
35 | * the parser and input reader have been turned inside out. Now,
|
---|
36 | * the parser is in control, and asks for input as needed. The old
|
---|
37 | * way had the input reader in control, and it asked for parsing to
|
---|
38 | * take place as needed. The new way makes it much easier to properly
|
---|
39 | * handle the recursion implicit in the various substitutions, especially
|
---|
40 | * across continuation lines.
|
---|
41 | *
|
---|
42 | * TODOs:
|
---|
43 | * grep for "TODO" and fix (some of them are easy)
|
---|
44 | * special variables (done: PWD, PPID, RANDOM)
|
---|
45 | * tilde expansion
|
---|
46 | * aliases
|
---|
47 | * follow IFS rules more precisely, including update semantics
|
---|
48 | * builtins mandated by standards we don't support:
|
---|
49 | * [un]alias, command, fc, getopts, newgrp, readonly, times
|
---|
50 | * make complex ${var%...} constructs support optional
|
---|
51 | * make here documents optional
|
---|
52 | *
|
---|
53 | * Bash compat TODO:
|
---|
54 | * redirection of stdout+stderr: &> and >&
|
---|
55 | * reserved words: function select
|
---|
56 | * advanced test: [[ ]]
|
---|
57 | * process substitution: <(list) and >(list)
|
---|
58 | * =~: regex operator
|
---|
59 | * let EXPR [EXPR...]
|
---|
60 | * Each EXPR is an arithmetic expression (ARITHMETIC EVALUATION)
|
---|
61 | * If the last arg evaluates to 0, let returns 1; 0 otherwise.
|
---|
62 | * NB: let `echo 'a=a + 1'` - error (IOW: multi-word expansion is used)
|
---|
63 | * ((EXPR))
|
---|
64 | * The EXPR is evaluated according to ARITHMETIC EVALUATION.
|
---|
65 | * This is exactly equivalent to let "EXPR".
|
---|
66 | * $[EXPR]: synonym for $((EXPR))
|
---|
67 | *
|
---|
68 | * Won't do:
|
---|
69 | * In bash, export builtin is special, its arguments are assignments
|
---|
70 | * and therefore expansion of them should be "one-word" expansion:
|
---|
71 | * $ export i=`echo 'a b'` # export has one arg: "i=a b"
|
---|
72 | * compare with:
|
---|
73 | * $ ls i=`echo 'a b'` # ls has two args: "i=a" and "b"
|
---|
74 | * ls: cannot access i=a: No such file or directory
|
---|
75 | * ls: cannot access b: No such file or directory
|
---|
76 | * Note1: same applies to local builtin.
|
---|
77 | * Note2: bash 3.2.33(1) does this only if export word itself
|
---|
78 | * is not quoted:
|
---|
79 | * $ export i=`echo 'aaa bbb'`; echo "$i"
|
---|
80 | * aaa bbb
|
---|
81 | * $ "export" i=`echo 'aaa bbb'`; echo "$i"
|
---|
82 | * aaa
|
---|
83 | */
|
---|
84 | #if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
|
---|
85 | || defined(__APPLE__) \
|
---|
86 | )
|
---|
87 | # include <malloc.h> /* for malloc_trim */
|
---|
88 | #endif
|
---|
89 | #include <glob.h>
|
---|
90 | /* #include <dmalloc.h> */
|
---|
91 | #if ENABLE_HUSH_CASE
|
---|
92 | # include <fnmatch.h>
|
---|
93 | #endif
|
---|
94 | #include <sys/utsname.h> /* for setting $HOSTNAME */
|
---|
95 |
|
---|
96 | #include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
|
---|
97 | #include "unicode.h"
|
---|
98 | #include "shell_common.h"
|
---|
99 | #include "math.h"
|
---|
100 | #include "match.h"
|
---|
101 | #if ENABLE_HUSH_RANDOM_SUPPORT
|
---|
102 | # include "random.h"
|
---|
103 | #else
|
---|
104 | # define CLEAR_RANDOM_T(rnd) ((void)0)
|
---|
105 | #endif
|
---|
106 | #ifndef PIPE_BUF
|
---|
107 | # define PIPE_BUF 4096 /* amount of buffering in a pipe */
|
---|
108 | #endif
|
---|
109 |
|
---|
110 | //config:config HUSH
|
---|
111 | //config: bool "hush"
|
---|
112 | //config: default y
|
---|
113 | //config: help
|
---|
114 | //config: hush is a small shell (25k). It handles the normal flow control
|
---|
115 | //config: constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
|
---|
116 | //config: case/esac. Redirections, here documents, $((arithmetic))
|
---|
117 | //config: and functions are supported.
|
---|
118 | //config:
|
---|
119 | //config: It will compile and work on no-mmu systems.
|
---|
120 | //config:
|
---|
121 | //config: It does not handle select, aliases, tilde expansion,
|
---|
122 | //config: &>file and >&file redirection of stdout+stderr.
|
---|
123 | //config:
|
---|
124 | //config:config HUSH_BASH_COMPAT
|
---|
125 | //config: bool "bash-compatible extensions"
|
---|
126 | //config: default y
|
---|
127 | //config: depends on HUSH
|
---|
128 | //config: help
|
---|
129 | //config: Enable bash-compatible extensions.
|
---|
130 | //config:
|
---|
131 | //config:config HUSH_BRACE_EXPANSION
|
---|
132 | //config: bool "Brace expansion"
|
---|
133 | //config: default y
|
---|
134 | //config: depends on HUSH_BASH_COMPAT
|
---|
135 | //config: help
|
---|
136 | //config: Enable {abc,def} extension.
|
---|
137 | //config:
|
---|
138 | //config:config HUSH_HELP
|
---|
139 | //config: bool "help builtin"
|
---|
140 | //config: default y
|
---|
141 | //config: depends on HUSH
|
---|
142 | //config: help
|
---|
143 | //config: Enable help builtin in hush. Code size + ~1 kbyte.
|
---|
144 | //config:
|
---|
145 | //config:config HUSH_INTERACTIVE
|
---|
146 | //config: bool "Interactive mode"
|
---|
147 | //config: default y
|
---|
148 | //config: depends on HUSH
|
---|
149 | //config: help
|
---|
150 | //config: Enable interactive mode (prompt and command editing).
|
---|
151 | //config: Without this, hush simply reads and executes commands
|
---|
152 | //config: from stdin just like a shell script from a file.
|
---|
153 | //config: No prompt, no PS1/PS2 magic shell variables.
|
---|
154 | //config:
|
---|
155 | //config:config HUSH_SAVEHISTORY
|
---|
156 | //config: bool "Save command history to .hush_history"
|
---|
157 | //config: default y
|
---|
158 | //config: depends on HUSH_INTERACTIVE && FEATURE_EDITING_SAVEHISTORY
|
---|
159 | //config: help
|
---|
160 | //config: Enable history saving in hush.
|
---|
161 | //config:
|
---|
162 | //config:config HUSH_JOB
|
---|
163 | //config: bool "Job control"
|
---|
164 | //config: default y
|
---|
165 | //config: depends on HUSH_INTERACTIVE
|
---|
166 | //config: help
|
---|
167 | //config: Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
|
---|
168 | //config: command (not entire shell), fg/bg builtins work. Without this option,
|
---|
169 | //config: "cmd &" still works by simply spawning a process and immediately
|
---|
170 | //config: prompting for next command (or executing next command in a script),
|
---|
171 | //config: but no separate process group is formed.
|
---|
172 | //config:
|
---|
173 | //config:config HUSH_TICK
|
---|
174 | //config: bool "Process substitution"
|
---|
175 | //config: default y
|
---|
176 | //config: depends on HUSH
|
---|
177 | //config: help
|
---|
178 | //config: Enable process substitution `command` and $(command) in hush.
|
---|
179 | //config:
|
---|
180 | //config:config HUSH_IF
|
---|
181 | //config: bool "Support if/then/elif/else/fi"
|
---|
182 | //config: default y
|
---|
183 | //config: depends on HUSH
|
---|
184 | //config: help
|
---|
185 | //config: Enable if/then/elif/else/fi in hush.
|
---|
186 | //config:
|
---|
187 | //config:config HUSH_LOOPS
|
---|
188 | //config: bool "Support for, while and until loops"
|
---|
189 | //config: default y
|
---|
190 | //config: depends on HUSH
|
---|
191 | //config: help
|
---|
192 | //config: Enable for, while and until loops in hush.
|
---|
193 | //config:
|
---|
194 | //config:config HUSH_CASE
|
---|
195 | //config: bool "Support case ... esac statement"
|
---|
196 | //config: default y
|
---|
197 | //config: depends on HUSH
|
---|
198 | //config: help
|
---|
199 | //config: Enable case ... esac statement in hush. +400 bytes.
|
---|
200 | //config:
|
---|
201 | //config:config HUSH_FUNCTIONS
|
---|
202 | //config: bool "Support funcname() { commands; } syntax"
|
---|
203 | //config: default y
|
---|
204 | //config: depends on HUSH
|
---|
205 | //config: help
|
---|
206 | //config: Enable support for shell functions in hush. +800 bytes.
|
---|
207 | //config:
|
---|
208 | //config:config HUSH_LOCAL
|
---|
209 | //config: bool "Support local builtin"
|
---|
210 | //config: default y
|
---|
211 | //config: depends on HUSH_FUNCTIONS
|
---|
212 | //config: help
|
---|
213 | //config: Enable support for local variables in functions.
|
---|
214 | //config:
|
---|
215 | //config:config HUSH_RANDOM_SUPPORT
|
---|
216 | //config: bool "Pseudorandom generator and $RANDOM variable"
|
---|
217 | //config: default y
|
---|
218 | //config: depends on HUSH
|
---|
219 | //config: help
|
---|
220 | //config: Enable pseudorandom generator and dynamic variable "$RANDOM".
|
---|
221 | //config: Each read of "$RANDOM" will generate a new pseudorandom value.
|
---|
222 | //config:
|
---|
223 | //config:config HUSH_EXPORT_N
|
---|
224 | //config: bool "Support 'export -n' option"
|
---|
225 | //config: default y
|
---|
226 | //config: depends on HUSH
|
---|
227 | //config: help
|
---|
228 | //config: export -n unexports variables. It is a bash extension.
|
---|
229 | //config:
|
---|
230 | //config:config HUSH_MODE_X
|
---|
231 | //config: bool "Support 'hush -x' option and 'set -x' command"
|
---|
232 | //config: default y
|
---|
233 | //config: depends on HUSH
|
---|
234 | //config: help
|
---|
235 | //config: This instructs hush to print commands before execution.
|
---|
236 | //config: Adds ~300 bytes.
|
---|
237 | //config:
|
---|
238 | //config:config MSH
|
---|
239 | //config: bool "msh (deprecated: aliased to hush)"
|
---|
240 | //config: default n
|
---|
241 | //config: select HUSH
|
---|
242 | //config: help
|
---|
243 | //config: msh is deprecated and will be removed, please migrate to hush.
|
---|
244 | //config:
|
---|
245 |
|
---|
246 | //applet:IF_HUSH(APPLET(hush, BB_DIR_BIN, BB_SUID_DROP))
|
---|
247 | //applet:IF_MSH(APPLET(msh, BB_DIR_BIN, BB_SUID_DROP))
|
---|
248 | //applet:IF_FEATURE_SH_IS_HUSH(APPLET_ODDNAME(sh, hush, BB_DIR_BIN, BB_SUID_DROP, sh))
|
---|
249 | //applet:IF_FEATURE_BASH_IS_HUSH(APPLET_ODDNAME(bash, hush, BB_DIR_BIN, BB_SUID_DROP, bash))
|
---|
250 |
|
---|
251 | //kbuild:lib-$(CONFIG_HUSH) += hush.o match.o shell_common.o
|
---|
252 | //kbuild:lib-$(CONFIG_HUSH_RANDOM_SUPPORT) += random.o
|
---|
253 |
|
---|
254 | /* -i (interactive) and -s (read stdin) are also accepted,
|
---|
255 | * but currently do nothing, therefore aren't shown in help.
|
---|
256 | * NOMMU-specific options are not meant to be used by users,
|
---|
257 | * therefore we don't show them either.
|
---|
258 | */
|
---|
259 | //usage:#define hush_trivial_usage
|
---|
260 | //usage: "[-nxl] [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
|
---|
261 | //usage:#define hush_full_usage "\n\n"
|
---|
262 | //usage: "Unix shell interpreter"
|
---|
263 |
|
---|
264 | //usage:#define msh_trivial_usage hush_trivial_usage
|
---|
265 | //usage:#define msh_full_usage hush_full_usage
|
---|
266 |
|
---|
267 | //usage:#if ENABLE_FEATURE_SH_IS_HUSH
|
---|
268 | //usage:# define sh_trivial_usage hush_trivial_usage
|
---|
269 | //usage:# define sh_full_usage hush_full_usage
|
---|
270 | //usage:#endif
|
---|
271 | //usage:#if ENABLE_FEATURE_BASH_IS_HUSH
|
---|
272 | //usage:# define bash_trivial_usage hush_trivial_usage
|
---|
273 | //usage:# define bash_full_usage hush_full_usage
|
---|
274 | //usage:#endif
|
---|
275 |
|
---|
276 |
|
---|
277 | /* Build knobs */
|
---|
278 | #define LEAK_HUNTING 0
|
---|
279 | #define BUILD_AS_NOMMU 0
|
---|
280 | /* Enable/disable sanity checks. Ok to enable in production,
|
---|
281 | * only adds a bit of bloat. Set to >1 to get non-production level verbosity.
|
---|
282 | * Keeping 1 for now even in released versions.
|
---|
283 | */
|
---|
284 | #define HUSH_DEBUG 1
|
---|
285 | /* Slightly bigger (+200 bytes), but faster hush.
|
---|
286 | * So far it only enables a trick with counting SIGCHLDs and forks,
|
---|
287 | * which allows us to do fewer waitpid's.
|
---|
288 | * (we can detect a case where neither forks were done nor SIGCHLDs happened
|
---|
289 | * and therefore waitpid will return the same result as last time)
|
---|
290 | */
|
---|
291 | #define ENABLE_HUSH_FAST 0
|
---|
292 | /* TODO: implement simplified code for users which do not need ${var%...} ops
|
---|
293 | * So far ${var%...} ops are always enabled:
|
---|
294 | */
|
---|
295 | #define ENABLE_HUSH_DOLLAR_OPS 1
|
---|
296 |
|
---|
297 |
|
---|
298 | #if BUILD_AS_NOMMU
|
---|
299 | # undef BB_MMU
|
---|
300 | # undef USE_FOR_NOMMU
|
---|
301 | # undef USE_FOR_MMU
|
---|
302 | # define BB_MMU 0
|
---|
303 | # define USE_FOR_NOMMU(...) __VA_ARGS__
|
---|
304 | # define USE_FOR_MMU(...)
|
---|
305 | #endif
|
---|
306 |
|
---|
307 | #include "NUM_APPLETS.h"
|
---|
308 | #if NUM_APPLETS == 1
|
---|
309 | /* STANDALONE does not make sense, and won't compile */
|
---|
310 | # undef CONFIG_FEATURE_SH_STANDALONE
|
---|
311 | # undef ENABLE_FEATURE_SH_STANDALONE
|
---|
312 | # undef IF_FEATURE_SH_STANDALONE
|
---|
313 | # undef IF_NOT_FEATURE_SH_STANDALONE
|
---|
314 | # define ENABLE_FEATURE_SH_STANDALONE 0
|
---|
315 | # define IF_FEATURE_SH_STANDALONE(...)
|
---|
316 | # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
|
---|
317 | #endif
|
---|
318 |
|
---|
319 | #if !ENABLE_HUSH_INTERACTIVE
|
---|
320 | # undef ENABLE_FEATURE_EDITING
|
---|
321 | # define ENABLE_FEATURE_EDITING 0
|
---|
322 | # undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
|
---|
323 | # define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
|
---|
324 | # undef ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
|
---|
325 | # define ENABLE_FEATURE_EDITING_SAVE_ON_EXIT 0
|
---|
326 | #endif
|
---|
327 |
|
---|
328 | /* Do we support ANY keywords? */
|
---|
329 | #if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
|
---|
330 | # define HAS_KEYWORDS 1
|
---|
331 | # define IF_HAS_KEYWORDS(...) __VA_ARGS__
|
---|
332 | # define IF_HAS_NO_KEYWORDS(...)
|
---|
333 | #else
|
---|
334 | # define HAS_KEYWORDS 0
|
---|
335 | # define IF_HAS_KEYWORDS(...)
|
---|
336 | # define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
|
---|
337 | #endif
|
---|
338 |
|
---|
339 | /* If you comment out one of these below, it will be #defined later
|
---|
340 | * to perform debug printfs to stderr: */
|
---|
341 | #define debug_printf(...) do {} while (0)
|
---|
342 | /* Finer-grained debug switches */
|
---|
343 | #define debug_printf_parse(...) do {} while (0)
|
---|
344 | #define debug_print_tree(a, b) do {} while (0)
|
---|
345 | #define debug_printf_exec(...) do {} while (0)
|
---|
346 | #define debug_printf_env(...) do {} while (0)
|
---|
347 | #define debug_printf_jobs(...) do {} while (0)
|
---|
348 | #define debug_printf_expand(...) do {} while (0)
|
---|
349 | #define debug_printf_varexp(...) do {} while (0)
|
---|
350 | #define debug_printf_glob(...) do {} while (0)
|
---|
351 | #define debug_printf_list(...) do {} while (0)
|
---|
352 | #define debug_printf_subst(...) do {} while (0)
|
---|
353 | #define debug_printf_clean(...) do {} while (0)
|
---|
354 |
|
---|
355 | #define ERR_PTR ((void*)(long)1)
|
---|
356 |
|
---|
357 | #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
|
---|
358 |
|
---|
359 | #define _SPECIAL_VARS_STR "_*@$!?#"
|
---|
360 | #define SPECIAL_VARS_STR ("_*@$!?#" + 1)
|
---|
361 | #define NUMERIC_SPECVARS_STR ("_*@$!?#" + 3)
|
---|
362 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
363 | /* Support / and // replace ops */
|
---|
364 | /* Note that // is stored as \ in "encoded" string representation */
|
---|
365 | # define VAR_ENCODED_SUBST_OPS "\\/%#:-=+?"
|
---|
366 | # define VAR_SUBST_OPS ("\\/%#:-=+?" + 1)
|
---|
367 | # define MINUS_PLUS_EQUAL_QUESTION ("\\/%#:-=+?" + 5)
|
---|
368 | #else
|
---|
369 | # define VAR_ENCODED_SUBST_OPS "%#:-=+?"
|
---|
370 | # define VAR_SUBST_OPS "%#:-=+?"
|
---|
371 | # define MINUS_PLUS_EQUAL_QUESTION ("%#:-=+?" + 3)
|
---|
372 | #endif
|
---|
373 |
|
---|
374 | #define SPECIAL_VAR_SYMBOL 3
|
---|
375 |
|
---|
376 | struct variable;
|
---|
377 |
|
---|
378 | static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="BB_VER;
|
---|
379 |
|
---|
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;
|
---|
390 | #endif
|
---|
391 |
|
---|
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 ,
|
---|
400 | #endif
|
---|
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 | };
|
---|
422 |
|
---|
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,
|
---|
445 | /* Not an assignment, but next word may be: "if v=xyz cmd;" */
|
---|
446 | WORD_IS_KEYWORD = 3,
|
---|
447 | };
|
---|
448 | /* Used for initialization: o_string foo = NULL_O_STRING; */
|
---|
449 | #define NULL_O_STRING { NULL }
|
---|
450 |
|
---|
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 |
|
---|
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
|
---|
468 | int last_char;
|
---|
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))
|
---|
475 |
|
---|
476 | /* The descrip member of this structure is only used to make
|
---|
477 | * debugging output pretty */
|
---|
478 | static const struct {
|
---|
479 | int mode;
|
---|
480 | signed char default_fd;
|
---|
481 | char descrip[3];
|
---|
482 | } redir_table[] = {
|
---|
483 | { O_RDONLY, 0, "<" },
|
---|
484 | { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
|
---|
485 | { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
|
---|
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, "<<" }, */
|
---|
490 | };
|
---|
491 |
|
---|
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 */
|
---|
512 |
|
---|
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
|
---|
532 | #endif
|
---|
533 | #if ENABLE_HUSH_FUNCTIONS
|
---|
534 | # define CMD_FUNCDEF 3
|
---|
535 | #endif
|
---|
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;
|
---|
542 | #endif
|
---|
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 | */
|
---|
559 | #endif
|
---|
560 | char **argv; /* command name and arguments */
|
---|
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 .$*.
|
---|
565 | * References of the form ^C`cmd arg^C are `cmd arg` substitutions.
|
---|
566 | */
|
---|
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)
|
---|
572 |
|
---|
573 | struct pipe {
|
---|
574 | struct pipe *next;
|
---|
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 */
|
---|
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
|
---|
583 | struct command *cmds; /* array of commands in pipe */
|
---|
584 | smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
|
---|
585 | IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */
|
---|
586 | IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */
|
---|
587 | };
|
---|
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))
|
---|
597 |
|
---|
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
|
---|
630 | };
|
---|
631 |
|
---|
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 */
|
---|
641 | #if ENABLE_HUSH_LOCAL
|
---|
642 | unsigned func_nest_level;
|
---|
643 | #endif
|
---|
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;
|
---|
647 | };
|
---|
648 |
|
---|
649 | enum {
|
---|
650 | BC_BREAK = 1,
|
---|
651 | BC_CONTINUE = 2,
|
---|
652 | };
|
---|
653 |
|
---|
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 | };
|
---|
664 | #endif
|
---|
665 |
|
---|
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 | */
|
---|
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 | ;
|
---|
704 | enum {
|
---|
705 | OPT_O_PIPEFAIL,
|
---|
706 | OPT_O_NOEXEC,
|
---|
707 | #if ENABLE_HUSH_MODE_X
|
---|
708 | OPT_O_XTRACE,
|
---|
709 | #endif
|
---|
710 | NUM_OPT_O
|
---|
711 | };
|
---|
712 |
|
---|
713 |
|
---|
714 | /* "Globals" within this file */
|
---|
715 | /* Sorted roughly by size (smaller offsets == smaller code) */
|
---|
716 | struct globals {
|
---|
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 | */
|
---|
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;
|
---|
734 | # define G_interactive_fd (G.interactive_fd)
|
---|
735 | #else
|
---|
736 | # define G_interactive_fd 0
|
---|
737 | #endif
|
---|
738 | #if ENABLE_FEATURE_EDITING
|
---|
739 | line_input_t *line_input_state;
|
---|
740 | #endif
|
---|
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
|
---|
747 | #if ENABLE_HUSH_JOB
|
---|
748 | int run_list_level;
|
---|
749 | int last_jobid;
|
---|
750 | pid_t saved_tty_pgrp;
|
---|
751 | struct pipe *job_list;
|
---|
752 | # define G_saved_tty_pgrp (G.saved_tty_pgrp)
|
---|
753 | #else
|
---|
754 | # define G_saved_tty_pgrp 0
|
---|
755 | #endif
|
---|
756 | char o_opt[NUM_OPT_O];
|
---|
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
|
---|
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;
|
---|
780 | char **global_argv;
|
---|
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
|
---|
788 | const char *ifs;
|
---|
789 | const char *cwd;
|
---|
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
|
---|
798 | #endif
|
---|
799 | /* Signal and trap handling */
|
---|
800 | #if ENABLE_HUSH_FAST
|
---|
801 | unsigned count_SIGCHLD;
|
---|
802 | unsigned handled_SIGCHLD;
|
---|
803 | smallint we_have_children;
|
---|
804 | #endif
|
---|
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
|
---|
819 | char **traps; /* char *traps[NSIG] */
|
---|
820 | sigset_t pending_set;
|
---|
821 | #if HUSH_DEBUG
|
---|
822 | unsigned long memleak_value;
|
---|
823 | int debug_indent;
|
---|
824 | #endif
|
---|
825 | struct sigaction sa;
|
---|
826 | char user_input_buf[ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 2];
|
---|
827 | };
|
---|
828 | #define G (*ptr_to_globals)
|
---|
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))); \
|
---|
834 | /* memset(&G.sa, 0, sizeof(G.sa)); */ \
|
---|
835 | sigfillset(&G.sa.sa_mask); \
|
---|
836 | G.sa.sa_flags = SA_RESTART; \
|
---|
837 | } while (0)
|
---|
838 |
|
---|
839 |
|
---|
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;
|
---|
847 | #if ENABLE_HUSH_JOB
|
---|
848 | static int builtin_fg_bg(char **argv) FAST_FUNC;
|
---|
849 | static int builtin_jobs(char **argv) FAST_FUNC;
|
---|
850 | #endif
|
---|
851 | #if ENABLE_HUSH_HELP
|
---|
852 | static int builtin_help(char **argv) FAST_FUNC;
|
---|
853 | #endif
|
---|
854 | #if MAX_HISTORY && ENABLE_FEATURE_EDITING
|
---|
855 | static int builtin_history(char **argv) FAST_FUNC;
|
---|
856 | #endif
|
---|
857 | #if ENABLE_HUSH_LOCAL
|
---|
858 | static int builtin_local(char **argv) FAST_FUNC;
|
---|
859 | #endif
|
---|
860 | #if HUSH_DEBUG
|
---|
861 | static int builtin_memleak(char **argv) FAST_FUNC;
|
---|
862 | #endif
|
---|
863 | #if ENABLE_PRINTF
|
---|
864 | static int builtin_printf(char **argv) FAST_FUNC;
|
---|
865 | #endif
|
---|
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;
|
---|
881 | #endif
|
---|
882 | #if ENABLE_HUSH_FUNCTIONS
|
---|
883 | static int builtin_return(char **argv) FAST_FUNC;
|
---|
884 | #endif
|
---|
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
|
---|
889 | * in the parent shell process. If forked, of course they cannot.
|
---|
890 | * For example, 'unset foo | whatever' will parse and run, but foo will
|
---|
891 | * still be set at the end. */
|
---|
892 | struct built_in_command {
|
---|
893 | const char *b_cmd;
|
---|
894 | int (*b_function)(char **argv) FAST_FUNC;
|
---|
895 | #if ENABLE_HUSH_HELP
|
---|
896 | const char *b_descr;
|
---|
897 | # define BLTIN(cmd, func, help) { cmd, func, help }
|
---|
898 | #else
|
---|
899 | # define BLTIN(cmd, func, help) { cmd, func }
|
---|
900 | #endif
|
---|
901 | };
|
---|
902 |
|
---|
903 | static const struct built_in_command bltins1[] = {
|
---|
904 | BLTIN("." , builtin_source , "Run commands in a file"),
|
---|
905 | BLTIN(":" , builtin_true , NULL),
|
---|
906 | #if ENABLE_HUSH_JOB
|
---|
907 | BLTIN("bg" , builtin_fg_bg , "Resume a job in the background"),
|
---|
908 | #endif
|
---|
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"),
|
---|
920 | #if ENABLE_HUSH_JOB
|
---|
921 | BLTIN("fg" , builtin_fg_bg , "Bring job into the foreground"),
|
---|
922 | #endif
|
---|
923 | #if ENABLE_HUSH_HELP
|
---|
924 | BLTIN("help" , builtin_help , NULL),
|
---|
925 | #endif
|
---|
926 | #if MAX_HISTORY && ENABLE_FEATURE_EDITING
|
---|
927 | BLTIN("history" , builtin_history , "Show command history"),
|
---|
928 | #endif
|
---|
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"),
|
---|
948 | BLTIN("true" , builtin_true , NULL),
|
---|
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"),
|
---|
954 | };
|
---|
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 | };
|
---|
966 |
|
---|
967 |
|
---|
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)
|
---|
1039 | {
|
---|
1040 | indent();
|
---|
1041 | fdprintf(2, "%s:\n", prefix);
|
---|
1042 | while (*vv)
|
---|
1043 | fdprintf(2, " '%s'\n", *vv++);
|
---|
1044 | }
|
---|
1045 | #else
|
---|
1046 | # define debug_print_strings(prefix, vv) ((void)0)
|
---|
1047 | #endif
|
---|
1048 |
|
---|
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)
|
---|
1054 | {
|
---|
1055 | void *ptr = xmalloc((size + 0xff) & ~0xff);
|
---|
1056 | fdprintf(2, "line %d: malloc %p\n", lineno, ptr);
|
---|
1057 | return ptr;
|
---|
1058 | }
|
---|
1059 | static void *xxrealloc(int lineno, void *ptr, size_t size)
|
---|
1060 | {
|
---|
1061 | ptr = xrealloc(ptr, (size + 0xff) & ~0xff);
|
---|
1062 | fdprintf(2, "line %d: realloc %p\n", lineno, ptr);
|
---|
1063 | return ptr;
|
---|
1064 | }
|
---|
1065 | static char *xxstrdup(int lineno, const char *str)
|
---|
1066 | {
|
---|
1067 | char *ptr = xstrdup(str);
|
---|
1068 | fdprintf(2, "line %d: strdup %p\n", lineno, ptr);
|
---|
1069 | return ptr;
|
---|
1070 | }
|
---|
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
|
---|
1081 |
|
---|
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, ...)
|
---|
1098 | {
|
---|
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();
|
---|
1109 | }
|
---|
1110 |
|
---|
1111 | static void syntax_error(unsigned lineno UNUSED_PARAM, const char *msg)
|
---|
1112 | {
|
---|
1113 | if (msg)
|
---|
1114 | bb_error_msg("syntax error: %s", msg);
|
---|
1115 | else
|
---|
1116 | bb_error_msg("syntax error");
|
---|
1117 | }
|
---|
1118 |
|
---|
1119 | static void syntax_error_at(unsigned lineno UNUSED_PARAM, const char *msg)
|
---|
1120 | {
|
---|
1121 | bb_error_msg("syntax error at '%s'", msg);
|
---|
1122 | }
|
---|
1123 |
|
---|
1124 | static void syntax_error_unterm_str(unsigned lineno UNUSED_PARAM, const char *s)
|
---|
1125 | {
|
---|
1126 | bb_error_msg("syntax error: unterminated %s", s);
|
---|
1127 | }
|
---|
1128 |
|
---|
1129 | static void syntax_error_unterm_ch(unsigned lineno, char ch)
|
---|
1130 | {
|
---|
1131 | char msg[2] = { ch, '\0' };
|
---|
1132 | syntax_error_unterm_str(lineno, msg);
|
---|
1133 | }
|
---|
1134 |
|
---|
1135 | static void syntax_error_unexpected_ch(unsigned lineno UNUSED_PARAM, int ch)
|
---|
1136 | {
|
---|
1137 | char msg[2];
|
---|
1138 | msg[0] = ch;
|
---|
1139 | msg[1] = '\0';
|
---|
1140 | bb_error_msg("syntax error: unexpected %s", ch == EOF ? "EOF" : msg);
|
---|
1141 | }
|
---|
1142 |
|
---|
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
|
---|
1158 |
|
---|
1159 |
|
---|
1160 | #if ENABLE_HUSH_INTERACTIVE
|
---|
1161 | static void cmdedit_update_prompt(void);
|
---|
1162 | #else
|
---|
1163 | # define cmdedit_update_prompt() ((void)0)
|
---|
1164 | #endif
|
---|
1165 |
|
---|
1166 |
|
---|
1167 | /* Utility functions
|
---|
1168 | */
|
---|
1169 | /* Replace each \x with x in place, return ptr past NUL. */
|
---|
1170 | static char *unbackslash(char *src)
|
---|
1171 | {
|
---|
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;
|
---|
1180 | }
|
---|
1181 |
|
---|
1182 | static char **add_strings_to_strings(char **strings, char **add, int need_to_dup)
|
---|
1183 | {
|
---|
1184 | int i;
|
---|
1185 | unsigned count1;
|
---|
1186 | unsigned count2;
|
---|
1187 | char **v;
|
---|
1188 |
|
---|
1189 | v = strings;
|
---|
1190 | count1 = 0;
|
---|
1191 | if (v) {
|
---|
1192 | while (*v) {
|
---|
1193 | count1++;
|
---|
1194 | v++;
|
---|
1195 | }
|
---|
1196 | }
|
---|
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;
|
---|
1209 | }
|
---|
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
|
---|
1220 |
|
---|
1221 | /* Note: takes ownership of "add" ptr (it is not strdup'ed) */
|
---|
1222 | static char **add_string_to_strings(char **strings, char *add)
|
---|
1223 | {
|
---|
1224 | char *v[2];
|
---|
1225 | v[0] = add;
|
---|
1226 | v[1] = NULL;
|
---|
1227 | return add_strings_to_strings(strings, v, /*dup:*/ 0);
|
---|
1228 | }
|
---|
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
|
---|
1239 |
|
---|
1240 | static void free_strings(char **strings)
|
---|
1241 | {
|
---|
1242 | char **v;
|
---|
1243 |
|
---|
1244 | if (!strings)
|
---|
1245 | return;
|
---|
1246 | v = strings;
|
---|
1247 | while (*v) {
|
---|
1248 | free(*v);
|
---|
1249 | v++;
|
---|
1250 | }
|
---|
1251 | free(strings);
|
---|
1252 | }
|
---|
1253 |
|
---|
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)
|
---|
1265 | {
|
---|
1266 | int n;
|
---|
1267 |
|
---|
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;
|
---|
1281 | }
|
---|
1282 |
|
---|
1283 | static void restore_G_args(save_arg_t *sv, char **argv)
|
---|
1284 | {
|
---|
1285 | char **pp;
|
---|
1286 |
|
---|
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);
|
---|
1293 | }
|
---|
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 | }
|
---|
1299 |
|
---|
1300 |
|
---|
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 | *
|
---|
1315 | * Wait builtin is interruptible by signals for which user trap is set
|
---|
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
|
---|
1354 | * Example 4: this does not wait and does not execute ls:
|
---|
1355 | * "sleep 5 & wait; ls -l" + press ^C
|
---|
1356 | *
|
---|
1357 | * (What happens to signals which are IGN on shell start?)
|
---|
1358 | * (What happens with signal mask on shell start?)
|
---|
1359 | *
|
---|
1360 | * Old implementation
|
---|
1361 | * ==================
|
---|
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 | *
|
---|
1369 | * unsigned special_sig_mask: a mask of such "special" signals
|
---|
1370 | * sigset_t blocked_set: current blocked signal set
|
---|
1371 | *
|
---|
1372 | * "trap - SIGxxx":
|
---|
1373 | * clear bit in blocked_set unless it is also in special_sig_mask
|
---|
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.
|
---|
1392 | *
|
---|
1393 | * Problem: the above approach makes it unwieldy to catch signals while
|
---|
1394 | * we are in read builtin, or while we read commands from stdin:
|
---|
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.
|
---|
1403 | * Signals are recorded in pending_set.
|
---|
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.
|
---|
1435 | */
|
---|
1436 | enum {
|
---|
1437 | SPECIAL_INTERACTIVE_SIGS = 0
|
---|
1438 | | (1 << SIGTERM)
|
---|
1439 | | (1 << SIGINT)
|
---|
1440 | | (1 << SIGHUP)
|
---|
1441 | ,
|
---|
1442 | SPECIAL_JOBSTOP_SIGS = 0
|
---|
1443 | #if ENABLE_HUSH_JOB
|
---|
1444 | | (1 << SIGTTIN)
|
---|
1445 | | (1 << SIGTTOU)
|
---|
1446 | | (1 << SIGTSTP)
|
---|
1447 | #endif
|
---|
1448 | ,
|
---|
1449 | };
|
---|
1450 |
|
---|
1451 | static void record_pending_signo(int sig)
|
---|
1452 | {
|
---|
1453 | sigaddset(&G.pending_set, sig);
|
---|
1454 | #if ENABLE_HUSH_FAST
|
---|
1455 | if (sig == SIGCHLD) {
|
---|
1456 | G.count_SIGCHLD++;
|
---|
1457 | //bb_error_msg("[%d] SIGCHLD_handler: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
---|
1458 | }
|
---|
1459 | #endif
|
---|
1460 | }
|
---|
1461 |
|
---|
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 |
|
---|
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 |
|
---|
1511 | #if ENABLE_HUSH_JOB
|
---|
1512 |
|
---|
1513 | /* After [v]fork, in child: do not restore tty pgrp on xfunc death */
|
---|
1514 | # define disable_restore_tty_pgrp_on_exit() (die_func = fflush_and__exit)
|
---|
1515 | /* After [v]fork, in parent: restore tty pgrp on xfunc death */
|
---|
1516 | # define enable_restore_tty_pgrp_on_exit() (die_func = restore_ttypgrp_and__exit)
|
---|
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.
|
---|
1522 | * We also call it if xfunc is exiting.
|
---|
1523 | */
|
---|
1524 | static void sigexit(int sig) NORETURN;
|
---|
1525 | static void sigexit(int sig)
|
---|
1526 | {
|
---|
1527 | /* Careful: we can end up here after [v]fork. Do not restore
|
---|
1528 | * tty pgrp then, only top-level shell process does that */
|
---|
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);
|
---|
1534 | tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp);
|
---|
1535 | }
|
---|
1536 |
|
---|
1537 | /* Not a signal, just exit */
|
---|
1538 | if (sig <= 0)
|
---|
1539 | _exit(- sig);
|
---|
1540 |
|
---|
1541 | kill_myself_with_sig(sig); /* does not return */
|
---|
1542 | }
|
---|
1543 | #else
|
---|
1544 |
|
---|
1545 | # define disable_restore_tty_pgrp_on_exit() ((void)0)
|
---|
1546 | # define enable_restore_tty_pgrp_on_exit() ((void)0)
|
---|
1547 |
|
---|
1548 | #endif
|
---|
1549 |
|
---|
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 |
|
---|
1577 | /* Restores tty foreground process group, and exits. */
|
---|
1578 | static void hush_exit(int exitcode)
|
---|
1579 | {
|
---|
1580 | #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
|
---|
1581 | save_history(G.line_input_state);
|
---|
1582 | #endif
|
---|
1583 |
|
---|
1584 | fflush_all();
|
---|
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 | }
|
---|
1596 |
|
---|
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 | }
|
---|
1610 | }
|
---|
1611 | #endif
|
---|
1612 |
|
---|
1613 | fflush_all();
|
---|
1614 | #if ENABLE_HUSH_JOB
|
---|
1615 | sigexit(- (exitcode & 0xff));
|
---|
1616 | #else
|
---|
1617 | _exit(exitcode);
|
---|
1618 | #endif
|
---|
1619 | }
|
---|
1620 |
|
---|
1621 |
|
---|
1622 | //TODO: return a mask of ALL handled sigs?
|
---|
1623 | static int check_and_run_traps(void)
|
---|
1624 | {
|
---|
1625 | int last_sig = 0;
|
---|
1626 |
|
---|
1627 | while (1) {
|
---|
1628 | int sig;
|
---|
1629 |
|
---|
1630 | if (sigisemptyset(&G.pending_set))
|
---|
1631 | break;
|
---|
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:
|
---|
1642 | if (G.traps && G.traps[sig]) {
|
---|
1643 | if (G.traps[sig][0]) {
|
---|
1644 | /* We have user-defined handler */
|
---|
1645 | smalluint save_rcode;
|
---|
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;
|
---|
1653 | last_sig = sig;
|
---|
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;
|
---|
1663 | last_sig = sig;
|
---|
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
|
---|
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
|
---|
1690 | default: /* ignored: */
|
---|
1691 | /* SIGTERM, SIGQUIT, SIGTTIN, SIGTTOU, SIGTSTP */
|
---|
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 | */
|
---|
1697 | break;
|
---|
1698 | }
|
---|
1699 | }
|
---|
1700 | return last_sig;
|
---|
1701 | }
|
---|
1702 |
|
---|
1703 |
|
---|
1704 | static const char *get_cwd(int force)
|
---|
1705 | {
|
---|
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;
|
---|
1716 | }
|
---|
1717 |
|
---|
1718 |
|
---|
1719 | /*
|
---|
1720 | * Shell and environment variable support
|
---|
1721 | */
|
---|
1722 | static struct variable **get_ptr_to_local_var(const char *name, unsigned len)
|
---|
1723 | {
|
---|
1724 | struct variable **pp;
|
---|
1725 | struct variable *cur;
|
---|
1726 |
|
---|
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;
|
---|
1734 | }
|
---|
1735 |
|
---|
1736 | static const char* FAST_FUNC get_local_var_value(const char *name)
|
---|
1737 | {
|
---|
1738 | struct variable **vpp;
|
---|
1739 | unsigned len = strlen(name);
|
---|
1740 |
|
---|
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 | }
|
---|
1750 |
|
---|
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;
|
---|
1763 | }
|
---|
1764 |
|
---|
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;
|
---|
1790 | char *free_me = NULL;
|
---|
1791 | char *eq_sign;
|
---|
1792 | int name_len;
|
---|
1793 |
|
---|
1794 | eq_sign = strchr(str, '=');
|
---|
1795 | if (!eq_sign) { /* not expected to ever happen? */
|
---|
1796 | free(str);
|
---|
1797 | return -1;
|
---|
1798 | }
|
---|
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 | }
|
---|
1807 |
|
---|
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 | }
|
---|
1856 | /* Can't reuse */
|
---|
1857 | cur->max_len = 0;
|
---|
1858 | goto set_str_and_exp;
|
---|
1859 | }
|
---|
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;
|
---|
1867 | goto set_str_and_exp;
|
---|
1868 | }
|
---|
1869 |
|
---|
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;
|
---|
1877 |
|
---|
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 {
|
---|
1893 | int i;
|
---|
1894 | debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr);
|
---|
1895 | i = putenv(cur->varstr);
|
---|
1896 | /* only now we can free old exported malloced string */
|
---|
1897 | free(free_me);
|
---|
1898 | return i;
|
---|
1899 | }
|
---|
1900 | }
|
---|
1901 | free(free_me);
|
---|
1902 | return 0;
|
---|
1903 | }
|
---|
1904 |
|
---|
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);
|
---|
1910 | }
|
---|
1911 |
|
---|
1912 | static int unset_local_var_len(const char *name, int name_len)
|
---|
1913 | {
|
---|
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;
|
---|
1935 | }
|
---|
1936 | var_pp = &cur->next;
|
---|
1937 | }
|
---|
1938 | return EXIT_SUCCESS;
|
---|
1939 | }
|
---|
1940 |
|
---|
1941 | static int unset_local_var(const char *name)
|
---|
1942 | {
|
---|
1943 | return unset_local_var_len(name, strlen(name));
|
---|
1944 | }
|
---|
1945 |
|
---|
1946 | static void unset_vars(char **strings)
|
---|
1947 | {
|
---|
1948 | char **v;
|
---|
1949 |
|
---|
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++;
|
---|
1957 | }
|
---|
1958 | free(strings);
|
---|
1959 | }
|
---|
1960 |
|
---|
1961 | static void FAST_FUNC set_local_var_from_halves(const char *name, const char *val)
|
---|
1962 | {
|
---|
1963 | char *var = xasprintf("%s=%s", name, val);
|
---|
1964 | set_local_var(var, /*flags:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
|
---|
1965 | }
|
---|
1966 |
|
---|
1967 |
|
---|
1968 | /*
|
---|
1969 | * Helpers for "var1=val1 var2=val2 cmd" feature
|
---|
1970 | */
|
---|
1971 | static void add_vars(struct variable *var)
|
---|
1972 | {
|
---|
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 | }
|
---|
1987 | }
|
---|
1988 |
|
---|
1989 | static struct variable *set_vars_and_save_old(char **strings)
|
---|
1990 | {
|
---|
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;
|
---|
2019 | }
|
---|
2020 |
|
---|
2021 |
|
---|
2022 | /*
|
---|
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 | /*
|
---|
2043 | * in_str support
|
---|
2044 | */
|
---|
2045 | static int FAST_FUNC static_get(struct in_str *i)
|
---|
2046 | {
|
---|
2047 | int ch = *i->p;
|
---|
2048 | if (ch != '\0') {
|
---|
2049 | i->p++;
|
---|
2050 | i->last_char = ch;
|
---|
2051 | return ch;
|
---|
2052 | }
|
---|
2053 | return EOF;
|
---|
2054 | }
|
---|
2055 |
|
---|
2056 | static int FAST_FUNC static_peek(struct in_str *i)
|
---|
2057 | {
|
---|
2058 | return *i->p;
|
---|
2059 | }
|
---|
2060 |
|
---|
2061 | #if ENABLE_HUSH_INTERACTIVE
|
---|
2062 |
|
---|
2063 | static void cmdedit_update_prompt(void)
|
---|
2064 | {
|
---|
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 = "> ";
|
---|
2075 | }
|
---|
2076 |
|
---|
2077 | static const char *setup_prompt_string(int promptmode)
|
---|
2078 | {
|
---|
2079 | const char *prompt_str;
|
---|
2080 | debug_printf("setup_prompt_string %d ", promptmode);
|
---|
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;
|
---|
2094 | debug_printf("result '%s'\n", prompt_str);
|
---|
2095 | return prompt_str;
|
---|
2096 | }
|
---|
2097 |
|
---|
2098 | static void get_user_input(struct in_str *i)
|
---|
2099 | {
|
---|
2100 | int r;
|
---|
2101 | const char *prompt_str;
|
---|
2102 |
|
---|
2103 | prompt_str = setup_prompt_string(i->promptmode);
|
---|
2104 | # if ENABLE_FEATURE_EDITING
|
---|
2105 | /* Enable command line editing only while a command line
|
---|
2106 | * is actually being read */
|
---|
2107 | do {
|
---|
2108 | reinit_unicode_for_hush();
|
---|
2109 | G.flag_SIGINT = 0;
|
---|
2110 | /* buglet: SIGINT will not make new prompt to appear _at once_,
|
---|
2111 | * only after <Enter>. (^C will work) */
|
---|
2112 | r = read_line_input(G.line_input_state, prompt_str, G.user_input_buf, CONFIG_FEATURE_EDITING_MAX_LEN-1, /*timeout*/ -1);
|
---|
2113 | /* catch *SIGINT* etc (^C is handled by read_line_input) */
|
---|
2114 | check_and_run_traps();
|
---|
2115 | } while (r == 0 || G.flag_SIGINT); /* repeat if ^C or SIGINT */
|
---|
2116 | i->eof_flag = (r < 0);
|
---|
2117 | if (i->eof_flag) { /* EOF/error detected */
|
---|
2118 | G.user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
|
---|
2119 | G.user_input_buf[1] = '\0';
|
---|
2120 | }
|
---|
2121 | # else
|
---|
2122 | do {
|
---|
2123 | G.flag_SIGINT = 0;
|
---|
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 | }
|
---|
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);
|
---|
2137 | i->eof_flag = (r == EOF);
|
---|
2138 | # endif
|
---|
2139 | i->p = G.user_input_buf;
|
---|
2140 | }
|
---|
2141 |
|
---|
2142 | #endif /* INTERACTIVE */
|
---|
2143 |
|
---|
2144 | /* This is the magic location that prints prompts
|
---|
2145 | * and gets data back from the user */
|
---|
2146 | static int FAST_FUNC file_get(struct in_str *i)
|
---|
2147 | {
|
---|
2148 | int ch;
|
---|
2149 |
|
---|
2150 | /* If there is data waiting, eat it up */
|
---|
2151 | if (i->p && *i->p) {
|
---|
2152 | #if ENABLE_HUSH_INTERACTIVE
|
---|
2153 | take_cached:
|
---|
2154 | #endif
|
---|
2155 | ch = *i->p++;
|
---|
2156 | if (i->eof_flag && !*i->p)
|
---|
2157 | ch = EOF;
|
---|
2158 | /* note: ch is never NUL */
|
---|
2159 | } else {
|
---|
2160 | /* need to double check i->file because we might be doing something
|
---|
2161 | * more complicated by now, like sourcing or substituting. */
|
---|
2162 | #if ENABLE_HUSH_INTERACTIVE
|
---|
2163 | if (G_interactive_fd && i->file == stdin) {
|
---|
2164 | do {
|
---|
2165 | get_user_input(i);
|
---|
2166 | } while (!*i->p); /* need non-empty line */
|
---|
2167 | i->promptmode = 1; /* PS2 */
|
---|
2168 | goto take_cached;
|
---|
2169 | }
|
---|
2170 | #endif
|
---|
2171 | do ch = fgetc(i->file); while (ch == '\0');
|
---|
2172 | }
|
---|
2173 | debug_printf("file_get: got '%c' %d\n", ch, ch);
|
---|
2174 | i->last_char = ch;
|
---|
2175 | return ch;
|
---|
2176 | }
|
---|
2177 |
|
---|
2178 | /* All callers guarantee this routine will never
|
---|
2179 | * be used right after a newline, so prompting is not needed.
|
---|
2180 | */
|
---|
2181 | static int FAST_FUNC file_peek(struct in_str *i)
|
---|
2182 | {
|
---|
2183 | int ch;
|
---|
2184 | if (i->p && *i->p) {
|
---|
2185 | if (i->eof_flag && !i->p[1])
|
---|
2186 | return EOF;
|
---|
2187 | return *i->p;
|
---|
2188 | /* note: ch is never NUL */
|
---|
2189 | }
|
---|
2190 | do ch = fgetc(i->file); while (ch == '\0');
|
---|
2191 | i->eof_flag = (ch == EOF);
|
---|
2192 | i->peek_buf[0] = ch;
|
---|
2193 | i->peek_buf[1] = '\0';
|
---|
2194 | i->p = i->peek_buf;
|
---|
2195 | debug_printf("file_peek: got '%c' %d\n", ch, ch);
|
---|
2196 | return ch;
|
---|
2197 | }
|
---|
2198 |
|
---|
2199 | static void setup_file_in_str(struct in_str *i, FILE *f)
|
---|
2200 | {
|
---|
2201 | memset(i, 0, sizeof(*i));
|
---|
2202 | i->peek = file_peek;
|
---|
2203 | i->get = file_get;
|
---|
2204 | /* i->promptmode = 0; - PS1 (memset did it) */
|
---|
2205 | i->file = f;
|
---|
2206 | /* i->p = NULL; */
|
---|
2207 | }
|
---|
2208 |
|
---|
2209 | static void setup_string_in_str(struct in_str *i, const char *s)
|
---|
2210 | {
|
---|
2211 | memset(i, 0, sizeof(*i));
|
---|
2212 | i->peek = static_peek;
|
---|
2213 | i->get = static_get;
|
---|
2214 | /* i->promptmode = 0; - PS1 (memset did it) */
|
---|
2215 | i->p = s;
|
---|
2216 | /* i->eof_flag = 0; */
|
---|
2217 | }
|
---|
2218 |
|
---|
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)
|
---|
2226 | {
|
---|
2227 | o->length = 0;
|
---|
2228 | o->has_quoted_part = 0;
|
---|
2229 | if (o->data)
|
---|
2230 | o->data[0] = '\0';
|
---|
2231 | }
|
---|
2232 |
|
---|
2233 | static void o_free(o_string *o)
|
---|
2234 | {
|
---|
2235 | free(o->data);
|
---|
2236 | memset(o, 0, sizeof(*o));
|
---|
2237 | }
|
---|
2238 |
|
---|
2239 | static ALWAYS_INLINE void o_free_unsafe(o_string *o)
|
---|
2240 | {
|
---|
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);
|
---|
2249 | }
|
---|
2250 | }
|
---|
2251 |
|
---|
2252 | static void o_addchr(o_string *o, int ch)
|
---|
2253 | {
|
---|
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 | }
|
---|
2260 |
|
---|
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 | }
|
---|
2268 |
|
---|
2269 | static void o_addstr(o_string *o, const char *str)
|
---|
2270 | {
|
---|
2271 | o_addblock(o, str, strlen(str));
|
---|
2272 | }
|
---|
2273 |
|
---|
2274 | #if !BB_MMU
|
---|
2275 | static void nommu_addchr(o_string *o, int ch)
|
---|
2276 | {
|
---|
2277 | if (o)
|
---|
2278 | o_addchr(o, ch);
|
---|
2279 | }
|
---|
2280 | #else
|
---|
2281 | # define nommu_addchr(o, str) ((void)0)
|
---|
2282 | #endif
|
---|
2283 |
|
---|
2284 | static void o_addstr_with_NUL(o_string *o, const char *str)
|
---|
2285 | {
|
---|
2286 | o_addblock(o, str, strlen(str) + 1);
|
---|
2287 | }
|
---|
2288 |
|
---|
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 | */
|
---|
2299 |
|
---|
2300 | #if ENABLE_HUSH_BRACE_EXPANSION
|
---|
2301 | # define MAYBE_BRACES "{}"
|
---|
2302 | #else
|
---|
2303 | # define MAYBE_BRACES ""
|
---|
2304 | #endif
|
---|
2305 |
|
---|
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++;
|
---|
2319 | }
|
---|
2320 | o->data[o->length] = ch;
|
---|
2321 | o->length++;
|
---|
2322 | o->data[o->length] = '\0';
|
---|
2323 | }
|
---|
2324 |
|
---|
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++;
|
---|
2334 | }
|
---|
2335 | o_grow_by(o, sz);
|
---|
2336 | o->data[o->length] = ch;
|
---|
2337 | o->length++;
|
---|
2338 | o->data[o->length] = '\0';
|
---|
2339 | }
|
---|
2340 |
|
---|
2341 | static void o_addqblock(o_string *o, const char *str, int len)
|
---|
2342 | {
|
---|
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)
|
---|
2351 | return; /* NUL is already added by o_addblock */
|
---|
2352 | str += ordinary_cnt;
|
---|
2353 | len -= ordinary_cnt + 1; /* we are processing + 1 char below */
|
---|
2354 |
|
---|
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++;
|
---|
2365 | }
|
---|
2366 | o->data[o->length] = '\0';
|
---|
2367 | }
|
---|
2368 |
|
---|
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;
|
---|
2374 | }
|
---|
2375 | o_addqblock(o, str, len);
|
---|
2376 | }
|
---|
2377 |
|
---|
2378 | static void o_addQstr(o_string *o, const char *str)
|
---|
2379 | {
|
---|
2380 | o_addQblock(o, str, strlen(str));
|
---|
2381 | }
|
---|
2382 |
|
---|
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)
|
---|
2395 | {
|
---|
2396 | char **list = (char**)o->data;
|
---|
2397 | int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
---|
2398 | int i = 0;
|
---|
2399 |
|
---|
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++;
|
---|
2412 | }
|
---|
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));
|
---|
2417 | }
|
---|
2418 | }
|
---|
2419 | #else
|
---|
2420 | # define debug_print_list(prefix, o, n) ((void)0)
|
---|
2421 | #endif
|
---|
2422 |
|
---|
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)
|
---|
2427 | {
|
---|
2428 | char **list = (char**)o->data;
|
---|
2429 | int string_start;
|
---|
2430 | int string_len;
|
---|
2431 |
|
---|
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 | }
|
---|
2447 | } else {
|
---|
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;
|
---|
2454 | }
|
---|
2455 | o->has_quoted_part = 0;
|
---|
2456 | list[n] = (char*)(uintptr_t)string_len;
|
---|
2457 | return n + 1;
|
---|
2458 | }
|
---|
2459 |
|
---|
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)
|
---|
2462 | {
|
---|
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;
|
---|
2467 | }
|
---|
2468 |
|
---|
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)
|
---|
2478 | {
|
---|
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++;
|
---|
2489 | }
|
---|
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 | }
|
---|
2509 |
|
---|
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;
|
---|
2521 |
|
---|
2522 | debug_printf_glob("glob_brace('%s')\n", pattern);
|
---|
2523 |
|
---|
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;
|
---|
2535 | }
|
---|
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;
|
---|
2543 | }
|
---|
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);
|
---|
2550 |
|
---|
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;
|
---|
2558 | }
|
---|
2559 | debug_printf_glob("rest:%s\n", rest);
|
---|
2560 | }
|
---|
2561 | rest_len = strlen(++rest) + 1;
|
---|
2562 |
|
---|
2563 | /* We are sure the brace expression is well-formed */
|
---|
2564 |
|
---|
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);
|
---|
2615 | }
|
---|
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);
|
---|
2621 | }
|
---|
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);
|
---|
2633 | }
|
---|
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;
|
---|
2642 |
|
---|
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 | }
|
---|
2654 |
|
---|
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;
|
---|
2663 | }
|
---|
2664 |
|
---|
2665 | #else /* !HUSH_BRACE_EXPANSION */
|
---|
2666 |
|
---|
2667 | /* Helper */
|
---|
2668 | static int glob_needed(const char *s)
|
---|
2669 | {
|
---|
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;
|
---|
2682 | }
|
---|
2683 | /* Performs globbing on last list[],
|
---|
2684 | * saving each result as a new list[].
|
---|
2685 | */
|
---|
2686 | static int perform_glob(o_string *o, int n)
|
---|
2687 | {
|
---|
2688 | glob_t globdata;
|
---|
2689 | int gr;
|
---|
2690 | char *pattern;
|
---|
2691 |
|
---|
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 | }
|
---|
2704 |
|
---|
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 "*.\*"!
|
---|
2710 | */
|
---|
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);
|
---|
2723 | }
|
---|
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 | }
|
---|
2741 |
|
---|
2742 | #endif /* !HUSH_BRACE_EXPANSION */
|
---|
2743 |
|
---|
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 */
|
---|
2754 | }
|
---|
2755 | return o_save_ptr_helper(o, n);
|
---|
2756 | }
|
---|
2757 |
|
---|
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;
|
---|
2763 |
|
---|
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 | }
|
---|
2777 |
|
---|
2778 | static void free_pipe_list(struct pipe *pi);
|
---|
2779 |
|
---|
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;
|
---|
2785 |
|
---|
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);
|
---|
2799 | }
|
---|
2800 | }
|
---|
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 | }
|
---|
2819 | #endif
|
---|
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;
|
---|
2832 | }
|
---|
2833 | debug_printf_clean(" rd_dup:%d\n", r->rd_dup);
|
---|
2834 | rnext = r->next;
|
---|
2835 | free(r);
|
---|
2836 | }
|
---|
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
|
---|
2845 |
|
---|
2846 | next = pi->next;
|
---|
2847 | free(pi);
|
---|
2848 | return next;
|
---|
2849 | }
|
---|
2850 |
|
---|
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);
|
---|
2856 | #endif
|
---|
2857 | debug_printf_clean("pipe followup code %d\n", pi->followup);
|
---|
2858 | pi = free_pipe(pi);
|
---|
2859 | }
|
---|
2860 | }
|
---|
2861 |
|
---|
2862 |
|
---|
2863 | /*** Parsing routines ***/
|
---|
2864 |
|
---|
2865 | #ifndef debug_print_tree
|
---|
2866 | static void debug_print_tree(struct pipe *pi, int lvl)
|
---|
2867 | {
|
---|
2868 | static const char *const PIPE[] = {
|
---|
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" ,
|
---|
2876 | # if ENABLE_HUSH_IF
|
---|
2877 | [RES_IF ] = "IF" ,
|
---|
2878 | [RES_THEN ] = "THEN" ,
|
---|
2879 | [RES_ELIF ] = "ELIF" ,
|
---|
2880 | [RES_ELSE ] = "ELSE" ,
|
---|
2881 | [RES_FI ] = "FI" ,
|
---|
2882 | # endif
|
---|
2883 | # if ENABLE_HUSH_LOOPS
|
---|
2884 | [RES_FOR ] = "FOR" ,
|
---|
2885 | [RES_WHILE] = "WHILE",
|
---|
2886 | [RES_UNTIL] = "UNTIL",
|
---|
2887 | [RES_DO ] = "DO" ,
|
---|
2888 | [RES_DONE ] = "DONE" ,
|
---|
2889 | # endif
|
---|
2890 | # if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
|
---|
2891 | [RES_IN ] = "IN" ,
|
---|
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
|
---|
2900 | [RES_XXXX ] = "XXXX" ,
|
---|
2901 | [RES_SNTX ] = "SNTX" ,
|
---|
2902 | };
|
---|
2903 | static const char *const CMDTYPE[] = {
|
---|
2904 | "{}",
|
---|
2905 | "()",
|
---|
2906 | "[noglob]",
|
---|
2907 | # if ENABLE_HUSH_FUNCTIONS
|
---|
2908 | "func()",
|
---|
2909 | # endif
|
---|
2910 | };
|
---|
2911 |
|
---|
2912 | int pin, prn;
|
---|
2913 |
|
---|
2914 | pin = 0;
|
---|
2915 | while (pi) {
|
---|
2916 | fdprintf(2, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
|
---|
2917 | pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
|
---|
2918 | prn = 0;
|
---|
2919 | while (prn < pi->num_cmds) {
|
---|
2920 | struct command *command = &pi->cmds[prn];
|
---|
2921 | char **argv = command->argv;
|
---|
2922 |
|
---|
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);
|
---|
2937 | prn++;
|
---|
2938 | continue;
|
---|
2939 | }
|
---|
2940 | if (argv) while (*argv) {
|
---|
2941 | fdprintf(2, " '%s'", *argv);
|
---|
2942 | argv++;
|
---|
2943 | }
|
---|
2944 | fdprintf(2, "\n");
|
---|
2945 | prn++;
|
---|
2946 | }
|
---|
2947 | pi = pi->next;
|
---|
2948 | pin++;
|
---|
2949 | }
|
---|
2950 | }
|
---|
2951 | #endif /* debug_print_tree */
|
---|
2952 |
|
---|
2953 | static struct pipe *new_pipe(void)
|
---|
2954 | {
|
---|
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;
|
---|
3006 | #endif
|
---|
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
|
---|
3012 | #if ENABLE_HUSH_IF
|
---|
3013 | || ctx->ctx_res_w == RES_FI
|
---|
3014 | #endif
|
---|
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 | }
|
---|
3058 |
|
---|
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 | }
|
---|
3069 |
|
---|
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
|
---|
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 },
|
---|
3119 | # endif
|
---|
3120 | # if ENABLE_HUSH_LOOPS
|
---|
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 },
|
---|
3127 | # endif
|
---|
3128 | # if ENABLE_HUSH_CASE
|
---|
3129 | { "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START },
|
---|
3130 | { "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END },
|
---|
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;
|
---|
3196 | debug_printf_parse("word->o_assignment='%s'\n", assignment_flag[word->o_assignment]);
|
---|
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
|
---|
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 | }
|
---|
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 | ) {
|
---|
3300 | int reserved = reserved_word(word, ctx);
|
---|
3301 | debug_printf_parse("checking for reserved-ness: %d\n", reserved);
|
---|
3302 | if (reserved) {
|
---|
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");
|
---|
3321 | return 1;
|
---|
3322 | }
|
---|
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 |
|
---|
3340 | if (word->has_quoted_part
|
---|
3341 | /* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
|
---|
3342 | && (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
|
---|
3343 | /* (otherwise it's known to be not empty and is already safe) */
|
---|
3344 | ) {
|
---|
3345 | /* exclude "$@" - 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");
|
---|
3365 | return 1;
|
---|
3366 | }
|
---|
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);
|
---|
3372 | }
|
---|
3373 | #endif
|
---|
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
|
---|
3380 |
|
---|
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)
|
---|
3399 | #endif
|
---|
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;
|
---|
3550 |
|
---|
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;
|
---|
3562 | }
|
---|
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 | }
|
---|
3574 | }
|
---|
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");
|
---|
3634 | #endif
|
---|
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;
|
---|
3694 | }
|
---|
3695 | #endif
|
---|
3696 |
|
---|
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;
|
---|
3722 | }
|
---|
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;
|
---|
3731 | #endif
|
---|
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 $(...) and `...` things */
|
---|
3762 | static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote);
|
---|
3763 | /* '...' */
|
---|
3764 | static int add_till_single_quote(o_string *dest, struct in_str *input)
|
---|
3765 | {
|
---|
3766 | while (1) {
|
---|
3767 | int ch = i_getch(input);
|
---|
3768 | if (ch == EOF) {
|
---|
3769 | syntax_error_unterm_ch('\'');
|
---|
3770 | return 0;
|
---|
3771 | }
|
---|
3772 | if (ch == '\'')
|
---|
3773 | return 1;
|
---|
3774 | o_addchr(dest, ch);
|
---|
3775 | }
|
---|
3776 | }
|
---|
3777 | /* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
|
---|
3778 | static int add_till_double_quote(o_string *dest, struct in_str *input)
|
---|
3779 | {
|
---|
3780 | while (1) {
|
---|
3781 | int ch = i_getch(input);
|
---|
3782 | if (ch == EOF) {
|
---|
3783 | syntax_error_unterm_ch('"');
|
---|
3784 | return 0;
|
---|
3785 | }
|
---|
3786 | if (ch == '"')
|
---|
3787 | return 1;
|
---|
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 == '`') {
|
---|
3794 | if (!add_till_backquote(dest, input, /*in_dquote:*/ 1))
|
---|
3795 | return 0;
|
---|
3796 | o_addchr(dest, ch);
|
---|
3797 | continue;
|
---|
3798 | }
|
---|
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 $(command)
|
---|
3810 | * form, or a quoted string, undefined results occur. A single-quoted
|
---|
3811 | * or double-quoted string that begins, but does not end, within the
|
---|
3812 | * "`...`" sequence produces undefined results."
|
---|
3813 | * Example Output
|
---|
3814 | * echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
|
---|
3815 | */
|
---|
3816 | static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote)
|
---|
3817 | {
|
---|
3818 | while (1) {
|
---|
3819 | int ch = i_getch(input);
|
---|
3820 | if (ch == '`')
|
---|
3821 | return 1;
|
---|
3822 | if (ch == '\\') {
|
---|
3823 | /* \x. Copy both unless it is \`, \$, \\ and maybe \" */
|
---|
3824 | ch = i_getch(input);
|
---|
3825 | if (ch != '`'
|
---|
3826 | && ch != '$'
|
---|
3827 | && ch != '\\'
|
---|
3828 | && (!in_dquote || ch != '"')
|
---|
3829 | ) {
|
---|
3830 | o_addchr(dest, '\\');
|
---|
3831 | }
|
---|
3832 | }
|
---|
3833 | if (ch == EOF) {
|
---|
3834 | syntax_error_unterm_ch('`');
|
---|
3835 | return 0;
|
---|
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);
|
---|
3871 | return 0;
|
---|
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;
|
---|
3880 | }
|
---|
3881 | }
|
---|
3882 | o_addchr(dest, ch);
|
---|
3883 | if (ch == '(' || ch == '{') {
|
---|
3884 | ch = (ch == '(' ? ')' : '}');
|
---|
3885 | if (!add_till_closing_bracket(dest, input, ch))
|
---|
3886 | return 0;
|
---|
3887 | o_addchr(dest, ch);
|
---|
3888 | continue;
|
---|
3889 | }
|
---|
3890 | if (ch == '\'') {
|
---|
3891 | if (!add_till_single_quote(dest, input))
|
---|
3892 | return 0;
|
---|
3893 | o_addchr(dest, ch);
|
---|
3894 | continue;
|
---|
3895 | }
|
---|
3896 | if (ch == '"') {
|
---|
3897 | if (!add_till_double_quote(dest, input))
|
---|
3898 | return 0;
|
---|
3899 | o_addchr(dest, ch);
|
---|
3900 | continue;
|
---|
3901 | }
|
---|
3902 | if (ch == '`') {
|
---|
3903 | if (!add_till_backquote(dest, input, /*in_dquote:*/ 0))
|
---|
3904 | return 0;
|
---|
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(')');
|
---|
3913 | return 0;
|
---|
3914 | }
|
---|
3915 | o_addchr(dest, ch);
|
---|
3916 | continue;
|
---|
3917 | }
|
---|
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
|
---|
3928 | #endif
|
---|
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}");
|
---|
3984 | debug_printf_parse("parse_dollar return 0: unterminated ${name}\n");
|
---|
3985 | return 0;
|
---|
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);
|
---|
4041 | if (last_ch == 0) /* error? */
|
---|
4042 | return 0;
|
---|
4043 | #else
|
---|
4044 | #error Simple code to only allow ${var} is not implemented
|
---|
4045 | #endif
|
---|
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;
|
---|
4068 | }
|
---|
4069 | }
|
---|
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;
|
---|
4087 | if (!add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG))
|
---|
4088 | return 0; /* error */
|
---|
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;
|
---|
4103 | if (!add_till_closing_bracket(dest, input, ')'))
|
---|
4104 | return 0; /* error */
|
---|
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 | }
|
---|
4113 | #endif
|
---|
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;
|
---|
4121 | }
|
---|
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 | /* $- Option flags set by set builtin or shell options (-i etc) */
|
---|
4128 | default:
|
---|
4129 | o_addQchr(dest, '$');
|
---|
4130 | }
|
---|
4131 | debug_printf_parse("parse_dollar return 1 (ok)\n");
|
---|
4132 | return 1;
|
---|
4133 | #undef as_string
|
---|
4134 | }
|
---|
4135 |
|
---|
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 */
|
---|
4173 | debug_printf_parse("encode_string return 1 (ok)\n");
|
---|
4174 | return 1;
|
---|
4175 | }
|
---|
4176 | /* note: can't move it above ch == dquote_end check! */
|
---|
4177 | if (ch == EOF) {
|
---|
4178 | syntax_error_unterm_ch('"');
|
---|
4179 | return 0; /* error */
|
---|
4180 | }
|
---|
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 == '$') {
|
---|
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;
|
---|
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 | '`');
|
---|
4222 | if (!add_till_backquote(dest, input, /*in_dquote:*/ dquote_end == '"'))
|
---|
4223 | return 0; /* error */
|
---|
4224 | o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
---|
4225 | //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
|
---|
4226 | goto again;
|
---|
4227 | }
|
---|
4228 | #endif
|
---|
4229 | o_addQchr(dest, ch);
|
---|
4230 | goto again;
|
---|
4231 | #undef as_string
|
---|
4232 | }
|
---|
4233 |
|
---|
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.
|
---|
4238 | * On syntax error, exit if shell is not interactive,
|
---|
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)
|
---|
4245 | {
|
---|
4246 | struct parse_context ctx;
|
---|
4247 | o_string dest = NULL_O_STRING;
|
---|
4248 | int heredoc_cnt;
|
---|
4249 |
|
---|
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;
|
---|
4288 | }
|
---|
4289 | /* end_trigger == '}' case errors out earlier,
|
---|
4290 | * checking only ')' */
|
---|
4291 | if (end_trigger == ')') {
|
---|
4292 | syntax_error_unterm_ch('(');
|
---|
4293 | goto parse_error;
|
---|
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
|
---|
4306 | IF_HAS_KEYWORDS(&& pi->res_word == RES_NONE)
|
---|
4307 | ) {
|
---|
4308 | free_pipe_list(pi);
|
---|
4309 | pi = NULL;
|
---|
4310 | }
|
---|
4311 | #if !BB_MMU
|
---|
4312 | debug_printf_parse("as_string1 '%s'\n", ctx.as_string.data);
|
---|
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;
|
---|
4321 | }
|
---|
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;
|
---|
4356 | debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
---|
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 | }
|
---|
4395 | }
|
---|
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;
|
---|
4406 | debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
---|
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;
|
---|
4456 | debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
---|
4457 | /* Do we sit outside of any if's, loops or case's? */
|
---|
4458 | if (!HAS_KEYWORDS
|
---|
4459 | IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0))
|
---|
4460 | ) {
|
---|
4461 | o_free(&dest);
|
---|
4462 | #if !BB_MMU
|
---|
4463 | debug_printf_parse("as_string2 '%s'\n", ctx.as_string.data);
|
---|
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;
|
---|
4563 | debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
---|
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 '$':
|
---|
4588 | if (!parse_dollar(&ctx.as_string, &dest, input, /*quote_mask:*/ 0)) {
|
---|
4589 | debug_printf_parse("parse_stream parse error: "
|
---|
4590 | "parse_dollar returned 0 (error)\n");
|
---|
4591 | goto parse_error;
|
---|
4592 | }
|
---|
4593 | break;
|
---|
4594 | case '\'':
|
---|
4595 | dest.has_quoted_part = 1;
|
---|
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);
|
---|
4613 | }
|
---|
4614 | }
|
---|
4615 | break;
|
---|
4616 | case '"':
|
---|
4617 | dest.has_quoted_part = 1;
|
---|
4618 | if (next == '"' && !ctx.pending_redirect)
|
---|
4619 | goto insert_empty_quoted_str_marker;
|
---|
4620 | if (dest.o_assignment == NOT_ASSIGNMENT)
|
---|
4621 | dest.o_expflags |= EXP_FLAG_ESC_GLOB_CHARS;
|
---|
4622 | if (!encode_string(&ctx.as_string, &dest, input, '"', /*process_bkslash:*/ 1))
|
---|
4623 | goto parse_error;
|
---|
4624 | dest.o_expflags &= ~EXP_FLAG_ESC_GLOB_CHARS;
|
---|
4625 | break;
|
---|
4626 | #if ENABLE_HUSH_TICK
|
---|
4627 | case '`': {
|
---|
4628 | USE_FOR_NOMMU(unsigned pos;)
|
---|
4629 |
|
---|
4630 | o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
---|
4631 | o_addchr(&dest, '`');
|
---|
4632 | USE_FOR_NOMMU(pos = dest.length;)
|
---|
4633 | if (!add_till_backquote(&dest, input, /*in_dquote:*/ 0))
|
---|
4634 | goto parse_error;
|
---|
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;
|
---|
4672 | debug_printf_parse("dest.o_assignment='%s'\n", assignment_flag[dest.o_assignment]);
|
---|
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);
|
---|
4682 | } else {
|
---|
4683 | done_pipe(&ctx, PIPE_BG);
|
---|
4684 | }
|
---|
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);
|
---|
4735 | }
|
---|
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);
|
---|
4770 |
|
---|
4771 | o_free(&dest);
|
---|
4772 | G.last_exitcode = 1;
|
---|
4773 | #if !BB_MMU
|
---|
4774 | if (pstring)
|
---|
4775 | *pstring = NULL;
|
---|
4776 | #endif
|
---|
4777 | debug_leave();
|
---|
4778 | return ERR_PTR;
|
---|
4779 | }
|
---|
4780 | }
|
---|
4781 |
|
---|
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 $VAR).
|
---|
4800 | * This new list is allocated as a single malloc block.
|
---|
4801 | * NULL-terminated list of char* pointers is at the beginning of it,
|
---|
4802 | * followed by strings themselves.
|
---|
4803 | * Caller can deallocate entire list by single free(list). */
|
---|
4804 |
|
---|
4805 | /* A horde of its helpers come first: */
|
---|
4806 |
|
---|
4807 | static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len)
|
---|
4808 | {
|
---|
4809 | while (--len >= 0) {
|
---|
4810 | char c = *str++;
|
---|
4811 |
|
---|
4812 | #if ENABLE_HUSH_BRACE_EXPANSION
|
---|
4813 | if (c == '{' || c == '}') {
|
---|
4814 | /* { -> \{, } -> \} */
|
---|
4815 | o_addchr(o, '\\');
|
---|
4816 | /* And now we want to add { or } and continue:
|
---|
4817 | * o_addchr(o, c);
|
---|
4818 | * continue;
|
---|
4819 | * luckily, just falling throught achieves this.
|
---|
4820 | */
|
---|
4821 | }
|
---|
4822 | #endif
|
---|
4823 | o_addchr(o, c);
|
---|
4824 | if (c == '\\') {
|
---|
4825 | /* \z -> \\\z; \<eol> -> \\<eol> */
|
---|
4826 | o_addchr(o, '\\');
|
---|
4827 | if (len) {
|
---|
4828 | len--;
|
---|
4829 | o_addchr(o, '\\');
|
---|
4830 | o_addchr(o, *str++);
|
---|
4831 | }
|
---|
4832 | }
|
---|
4833 | }
|
---|
4834 | }
|
---|
4835 |
|
---|
4836 | /* Store given string, finalizing the word and starting new one whenever
|
---|
4837 | * we encounter IFS char(s). This is used for expanding variable values.
|
---|
4838 | * End-of-string does NOT finalize word: think about 'echo -$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)
|
---|
4843 | {
|
---|
4844 | int last_is_ifs = 0;
|
---|
4845 |
|
---|
4846 | while (1) {
|
---|
4847 | int word_len;
|
---|
4848 |
|
---|
4849 | if (!*str) /* EOL - do not finalize word */
|
---|
4850 | break;
|
---|
4851 | word_len = strcspn(str, G.ifs);
|
---|
4852 | if (word_len) {
|
---|
4853 | /* We have WORD_LEN leading non-IFS chars */
|
---|
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$v" prints "Z*" instead of Z* files */
|
---|
4865 | }
|
---|
4866 | last_is_ifs = 0;
|
---|
4867 | str += word_len;
|
---|
4868 | if (!*str) /* EOL - do not finalize word */
|
---|
4869 | break;
|
---|
4870 | }
|
---|
4871 |
|
---|
4872 | /* We know str here points to at least one IFS char */
|
---|
4873 | last_is_ifs = 1;
|
---|
4874 | str += strspn(str, G.ifs); /* skip IFS chars */
|
---|
4875 | if (!*str) /* EOL - do not finalize word */
|
---|
4876 | break;
|
---|
4877 |
|
---|
4878 | /* Start new word... but not always! */
|
---|
4879 | /* Case "v=' a'; echo ''$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 | }
|
---|
4892 | }
|
---|
4893 |
|
---|
4894 | if (ended_with_ifs)
|
---|
4895 | *ended_with_ifs = last_is_ifs;
|
---|
4896 | debug_print_list("expand_on_ifs[1]", output, n);
|
---|
4897 | return n;
|
---|
4898 | }
|
---|
4899 |
|
---|
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.
|
---|
4906 | */
|
---|
4907 | #if !ENABLE_HUSH_BASH_COMPAT
|
---|
4908 | /* only ${var/pattern/repl} (its pattern part) needs additional mode */
|
---|
4909 | #define encode_then_expand_string(str, process_bkslash, do_unbackslash) \
|
---|
4910 | encode_then_expand_string(str)
|
---|
4911 | #endif
|
---|
4912 | static char *encode_then_expand_string(const char *str, int process_bkslash, int do_unbackslash)
|
---|
4913 | {
|
---|
4914 | char *exp_str;
|
---|
4915 | struct in_str input;
|
---|
4916 | o_string dest = NULL_O_STRING;
|
---|
4917 |
|
---|
4918 | if (!strchr(str, '$')
|
---|
4919 | && !strchr(str, '\\')
|
---|
4920 | #if ENABLE_HUSH_TICK
|
---|
4921 | && !strchr(str, '`')
|
---|
4922 | #endif
|
---|
4923 | ) {
|
---|
4924 | return NULL;
|
---|
4925 | }
|
---|
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);
|
---|
4932 | //TODO: error check (encode_string returns 0 on error)?
|
---|
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;
|
---|
4938 | }
|
---|
4939 |
|
---|
4940 | #if ENABLE_SH_MATH_SUPPORT
|
---|
4941 | static arith_t expand_and_evaluate_arith(const char *arg, const char **errmsg_p)
|
---|
4942 | {
|
---|
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;
|
---|
4958 | }
|
---|
4959 | #endif
|
---|
4960 |
|
---|
4961 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
4962 | /* ${var/[/]pattern[/repl]} helpers */
|
---|
4963 | static char *strstr_pattern(char *val, const char *pattern, int *size)
|
---|
4964 | {
|
---|
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;
|
---|
4971 | }
|
---|
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++;
|
---|
4980 | }
|
---|
4981 | }
|
---|
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);
|
---|
4987 |
|
---|
4988 | while (1) {
|
---|
4989 | int size;
|
---|
4990 | char *s = strstr_pattern(val, pattern, &size);
|
---|
4991 | if (!s)
|
---|
4992 | break;
|
---|
4993 |
|
---|
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;
|
---|
5004 | }
|
---|
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;
|
---|
5012 | }
|
---|
5013 | #endif
|
---|
5014 |
|
---|
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)
|
---|
5019 | {
|
---|
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;
|
---|
5030 |
|
---|
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;
|
---|
5037 |
|
---|
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: $N with too big N */
|
---|
5080 | } else {
|
---|
5081 | switch (var[0]) {
|
---|
5082 | case '$': /* pid */
|
---|
5083 | val = utoa(G.root_pid);
|
---|
5084 | break;
|
---|
5085 | case '!': /* bg pid */
|
---|
5086 | val = G.last_bg_pid ? utoa(G.last_bg_pid) : "";
|
---|
5087 | break;
|
---|
5088 | case '?': /* exitcode */
|
---|
5089 | val = utoa(G.last_exitcode);
|
---|
5090 | break;
|
---|
5091 | case '#': /* argc */
|
---|
5092 | val = utoa(G.global_argc ? G.global_argc-1 : 0);
|
---|
5093 | break;
|
---|
5094 | default:
|
---|
5095 | val = get_local_var_value(var);
|
---|
5096 | }
|
---|
5097 | }
|
---|
5098 |
|
---|
5099 | /* Handle any expansions */
|
---|
5100 | if (exp_op == 'L') {
|
---|
5101 | reinit_unicode_for_hush();
|
---|
5102 | debug_printf_expand("expand: length(%s)=", val);
|
---|
5103 | val = utoa(val ? unicode_strlen(val) : 0);
|
---|
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 | }
|
---|
5141 | }
|
---|
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);
|
---|
5207 | *p = '\0';
|
---|
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);
|
---|
5231 | val = NULL;
|
---|
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 | }
|
---|
5275 |
|
---|
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 | }
|
---|
5287 | }
|
---|
5288 | } /* one of "-=+?" */
|
---|
5289 |
|
---|
5290 | *exp_saveptr = exp_save;
|
---|
5291 | } /* if (exp_op) */
|
---|
5292 |
|
---|
5293 | arg[0] = arg0;
|
---|
5294 |
|
---|
5295 | *pp = p;
|
---|
5296 | *to_be_freed_pp = to_be_freed;
|
---|
5297 | return val;
|
---|
5298 | }
|
---|
5299 |
|
---|
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! */
|
---|
5305 | static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg)
|
---|
5306 | {
|
---|
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 */
|
---|
5311 | int ended_in_ifs = 0; /* did last unquoted expansion end with IFS chars? */
|
---|
5312 | char *p;
|
---|
5313 |
|
---|
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);
|
---|
5319 |
|
---|
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
|
---|
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 |
|
---|
5337 | o_addblock(output, arg, p - arg);
|
---|
5338 | debug_print_list("expand_vars_to_list[1]", output, n);
|
---|
5339 | arg = ++p;
|
---|
5340 | p = strchr(p, SPECIAL_VAR_SYMBOL);
|
---|
5341 |
|
---|
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 |
|
---|
5354 | switch (first_ch & 0x7f) {
|
---|
5355 | /* Highest bit in first_ch indicates that var is double-quoted */
|
---|
5356 | case '*':
|
---|
5357 | case '@': {
|
---|
5358 | int i;
|
---|
5359 | if (!G.global_argv[1])
|
---|
5360 | break;
|
---|
5361 | i = 1;
|
---|
5362 | cant_be_null |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
|
---|
5363 | if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
|
---|
5364 | while (G.global_argv[i]) {
|
---|
5365 | n = expand_on_ifs(NULL, output, n, G.global_argv[i]);
|
---|
5366 | debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
|
---|
5367 | if (G.global_argv[i++][0] && G.global_argv[i]) {
|
---|
5368 | /* this argv[] is not empty and not last:
|
---|
5369 | * put terminating NUL, start new word */
|
---|
5370 | o_addchr(output, '\0');
|
---|
5371 | debug_print_list("expand_vars_to_list[2]", output, n);
|
---|
5372 | n = o_save_ptr(output, n);
|
---|
5373 | debug_print_list("expand_vars_to_list[3]", output, n);
|
---|
5374 | }
|
---|
5375 | }
|
---|
5376 | } else
|
---|
5377 | /* If EXP_FLAG_SINGLEWORD, we handle assignment 'a=....$@.....'
|
---|
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 | ) {
|
---|
5382 | while (1) {
|
---|
5383 | o_addQstr(output, G.global_argv[i]);
|
---|
5384 | if (++i >= G.global_argc)
|
---|
5385 | break;
|
---|
5386 | o_addchr(output, '\0');
|
---|
5387 | debug_print_list("expand_vars_to_list[4]", output, n);
|
---|
5388 | n = o_save_ptr(output, n);
|
---|
5389 | }
|
---|
5390 | } else { /* quoted $* (or v="$@" case): add as one word */
|
---|
5391 | while (1) {
|
---|
5392 | o_addQstr(output, G.global_argv[i]);
|
---|
5393 | if (!G.global_argv[++i])
|
---|
5394 | break;
|
---|
5395 | if (G.ifs[0])
|
---|
5396 | o_addchr(output, G.ifs[0]);
|
---|
5397 | }
|
---|
5398 | output->has_quoted_part = 1;
|
---|
5399 | }
|
---|
5400 | break;
|
---|
5401 | }
|
---|
5402 | case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
|
---|
5403 | /* "Empty variable", used to make "" etc to not disappear */
|
---|
5404 | output->has_quoted_part = 1;
|
---|
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
|
---|
5435 | default:
|
---|
5436 | val = expand_one_var(&to_be_freed, arg, &p);
|
---|
5437 | IF_HUSH_TICK(store_val:)
|
---|
5438 | if (!(first_ch & 0x80)) { /* unquoted $VAR */
|
---|
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]) {
|
---|
5442 | n = expand_on_ifs(&ended_in_ifs, output, n, val);
|
---|
5443 | val = NULL;
|
---|
5444 | }
|
---|
5445 | } else { /* quoted $VAR, val will be appended below */
|
---|
5446 | output->has_quoted_part = 1;
|
---|
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);
|
---|
5455 | }
|
---|
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
|
---|
5466 | arg = ++p;
|
---|
5467 | } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
|
---|
5468 |
|
---|
5469 | if (arg[0]) {
|
---|
5470 | if (ended_in_ifs) {
|
---|
5471 | o_addchr(output, '\0');
|
---|
5472 | n = o_save_ptr(output, n);
|
---|
5473 | }
|
---|
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');
|
---|
5487 | }
|
---|
5488 |
|
---|
5489 | return n;
|
---|
5490 | }
|
---|
5491 |
|
---|
5492 | static char **expand_variables(char **argv, unsigned expflags)
|
---|
5493 | {
|
---|
5494 | int n;
|
---|
5495 | char **list;
|
---|
5496 | o_string output = NULL_O_STRING;
|
---|
5497 |
|
---|
5498 | output.o_expflags = expflags;
|
---|
5499 |
|
---|
5500 | n = 0;
|
---|
5501 | while (*argv) {
|
---|
5502 | n = expand_vars_to_list(&output, n, *argv);
|
---|
5503 | argv++;
|
---|
5504 | }
|
---|
5505 | debug_print_list("expand_variables", &output, n);
|
---|
5506 |
|
---|
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);
|
---|
5510 | return list;
|
---|
5511 | }
|
---|
5512 |
|
---|
5513 | static char **expand_strvec_to_strvec(char **argv)
|
---|
5514 | {
|
---|
5515 | return expand_variables(argv, EXP_FLAG_GLOB | EXP_FLAG_ESC_GLOB_CHARS);
|
---|
5516 | }
|
---|
5517 |
|
---|
5518 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
5519 | static char **expand_strvec_to_strvec_singleword_noglob(char **argv)
|
---|
5520 | {
|
---|
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
|
---|
5536 | char *argv[2], **list;
|
---|
5537 |
|
---|
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 |
|
---|
5549 | argv[0] = (char*)str;
|
---|
5550 | argv[1] = NULL;
|
---|
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)
|
---|
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 */
|
---|
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);
|
---|
5563 | return (char*)list;
|
---|
5564 | }
|
---|
5565 |
|
---|
5566 | /* Used for "eval" builtin */
|
---|
5567 | static char* expand_strvec_to_string(char **argv)
|
---|
5568 | {
|
---|
5569 | char **list;
|
---|
5570 |
|
---|
5571 | list = expand_variables(argv, EXP_FLAG_SINGLEWORD);
|
---|
5572 | /* Convert all NULs to spaces */
|
---|
5573 | if (list[0]) {
|
---|
5574 | int n = 1;
|
---|
5575 | while (list[n]) {
|
---|
5576 | if (HUSH_DEBUG)
|
---|
5577 | if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
|
---|
5578 | bb_error_msg_and_die("BUG in varexp3");
|
---|
5579 | /* bash uses ' ' regardless of $IFS contents */
|
---|
5580 | list[n][-1] = ' ';
|
---|
5581 | n++;
|
---|
5582 | }
|
---|
5583 | }
|
---|
5584 | overlapping_strcpy((char*)list, list[0]);
|
---|
5585 | debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
|
---|
5586 | return (char*)list;
|
---|
5587 | }
|
---|
5588 |
|
---|
5589 | static char **expand_assignments(char **argv, int count)
|
---|
5590 | {
|
---|
5591 | int i;
|
---|
5592 | char **p;
|
---|
5593 |
|
---|
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));
|
---|
5598 | }
|
---|
5599 | G.expanded_assignments = NULL;
|
---|
5600 | return p;
|
---|
5601 | }
|
---|
5602 |
|
---|
5603 |
|
---|
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 |
|
---|
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)
|
---|
5630 | {
|
---|
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 | */
|
---|
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 */
|
---|
5645 |
|
---|
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 */
|
---|
5654 |
|
---|
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: */
|
---|
5665 | free(G.traps[sig]);
|
---|
5666 | G.traps[sig] = NULL;
|
---|
5667 | /* There is no signal for trap 0 (EXIT) */
|
---|
5668 | if (sig == 0)
|
---|
5669 | continue;
|
---|
5670 | install_sighandler(sig, pick_sighandler(sig));
|
---|
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];
|
---|
5687 | struct variable *cur;
|
---|
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;
|
---|
5694 |
|
---|
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;
|
---|
5703 | }
|
---|
5704 |
|
---|
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)
|
---|
5749 | continue;
|
---|
5750 | if (cur->flg_read_only) {
|
---|
5751 | *pp++ = (char *) "-R";
|
---|
5752 | *pp++ = cur->varstr;
|
---|
5753 | } else if (!cur->flg_export) {
|
---|
5754 | *pp++ = (char *) "-V";
|
---|
5755 | *pp++ = cur->varstr;
|
---|
5756 | }
|
---|
5757 | }
|
---|
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;
|
---|
5795 |
|
---|
5796 | do_exec:
|
---|
5797 | debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s);
|
---|
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);
|
---|
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");
|
---|
5807 | }
|
---|
5808 | #endif /* !BB_MMU */
|
---|
5809 |
|
---|
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)
|
---|
5820 | {
|
---|
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;
|
---|
5830 |
|
---|
5831 | #if ENABLE_HUSH_INTERACTIVE
|
---|
5832 | if (end_trigger == ';')
|
---|
5833 | inp->promptmode = 0; /* PS1 */
|
---|
5834 | #endif
|
---|
5835 | pipe_list = parse_stream(NULL, inp, end_trigger);
|
---|
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)
|
---|
5854 | G.last_exitcode = 0;
|
---|
5855 | break;
|
---|
5856 | }
|
---|
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;
|
---|
5861 | #if ENABLE_HUSH_FUNCTIONS
|
---|
5862 | if (G.flag_return_in_progress == 1)
|
---|
5863 | break;
|
---|
5864 | #endif
|
---|
5865 | }
|
---|
5866 | }
|
---|
5867 |
|
---|
5868 | static void parse_and_run_string(const char *s)
|
---|
5869 | {
|
---|
5870 | struct in_str input;
|
---|
5871 | setup_string_in_str(&input, s);
|
---|
5872 | parse_and_run_stream(&input, '\0');
|
---|
5873 | }
|
---|
5874 |
|
---|
5875 | static void parse_and_run_file(FILE *f)
|
---|
5876 | {
|
---|
5877 | struct in_str input;
|
---|
5878 | setup_file_in_str(&input, f);
|
---|
5879 | parse_and_run_stream(&input, ';');
|
---|
5880 | }
|
---|
5881 |
|
---|
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);
|
---|
5944 | if (is_prefixed_with(s, "trap")
|
---|
5945 | && skip_whitespace(s + 4)[0] == '\0'
|
---|
5946 | ) {
|
---|
5947 | static const char *const argv[] = { NULL, NULL };
|
---|
5948 | builtin_trap((char**)argv);
|
---|
5949 | fflush_all(); /* important */
|
---|
5950 | _exit(0);
|
---|
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
|
---|
5968 | }
|
---|
5969 |
|
---|
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 | }
|
---|
5986 |
|
---|
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;
|
---|
5994 |
|
---|
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);
|
---|
6010 | }
|
---|
6011 |
|
---|
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);
|
---|
6020 | }
|
---|
6021 | #endif /* ENABLE_HUSH_TICK */
|
---|
6022 |
|
---|
6023 |
|
---|
6024 | static void setup_heredoc(struct redir_struct *redir)
|
---|
6025 | {
|
---|
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;
|
---|
6034 | #endif
|
---|
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;
|
---|
6072 | #endif
|
---|
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 | }
|
---|
6104 |
|
---|
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;
|
---|
6111 |
|
---|
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);
|
---|
6125 | continue;
|
---|
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?
|
---|
6145 | return 1;
|
---|
6146 | }
|
---|
6147 | } else {
|
---|
6148 | /* rd_fd<*>rd_dup or rd_fd<*>- cases */
|
---|
6149 | openfd = redir->rd_dup;
|
---|
6150 | }
|
---|
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 | }
|
---|
6166 | }
|
---|
6167 | }
|
---|
6168 | return 0;
|
---|
6169 | }
|
---|
6170 |
|
---|
6171 | static void restore_redirects(int squirrel[])
|
---|
6172 | {
|
---|
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 | }
|
---|
6182 |
|
---|
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);
|
---|
6202 | }
|
---|
6203 | if (access(ret, F_OK) == 0)
|
---|
6204 | break;
|
---|
6205 |
|
---|
6206 | if (*end == '\0') {
|
---|
6207 | free(ret);
|
---|
6208 | return NULL;
|
---|
6209 | }
|
---|
6210 | PATH = end + 1;
|
---|
6211 | }
|
---|
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;
|
---|
6227 | }
|
---|
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 | }
|
---|
6241 |
|
---|
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;
|
---|
6249 | }
|
---|
6250 | funcpp = &(*funcpp)->next;
|
---|
6251 | }
|
---|
6252 | return funcpp;
|
---|
6253 | }
|
---|
6254 |
|
---|
6255 | static const struct function *find_function(const char *name)
|
---|
6256 | {
|
---|
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 | }
|
---|
6262 |
|
---|
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
|
---|
6291 | }
|
---|
6292 | } else {
|
---|
6293 | debug_printf_exec("remembering new function '%s'\n", name);
|
---|
6294 | funcp = *funcpp = xzalloc(sizeof(*funcp));
|
---|
6295 | /*funcp->next = NULL;*/
|
---|
6296 | }
|
---|
6297 |
|
---|
6298 | funcp->name = name;
|
---|
6299 | return funcp;
|
---|
6300 | }
|
---|
6301 |
|
---|
6302 | static void unset_func(const char *name)
|
---|
6303 | {
|
---|
6304 | struct function **funcpp = find_function_slot(name);
|
---|
6305 | struct function *funcp = *funcpp;
|
---|
6306 |
|
---|
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 | }
|
---|
6323 | }
|
---|
6324 |
|
---|
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)
|
---|
6335 | {
|
---|
6336 | # if BB_MMU
|
---|
6337 | int n = 1;
|
---|
6338 |
|
---|
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
|
---|
6355 | }
|
---|
6356 |
|
---|
6357 | static int run_function(const struct function *funcp, char **argv)
|
---|
6358 | {
|
---|
6359 | int rc;
|
---|
6360 | save_arg_t sv;
|
---|
6361 | smallint sv_flg;
|
---|
6362 |
|
---|
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);
|
---|
6382 | }
|
---|
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--;
|
---|
6406 | }
|
---|
6407 | # endif
|
---|
6408 | G.flag_return_in_progress = sv_flg;
|
---|
6409 |
|
---|
6410 | restore_G_args(&sv, argv);
|
---|
6411 |
|
---|
6412 | return rc;
|
---|
6413 | }
|
---|
6414 | #endif /* ENABLE_HUSH_FUNCTIONS */
|
---|
6415 |
|
---|
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)
|
---|
6430 | {
|
---|
6431 | #if BB_MMU
|
---|
6432 | int rcode;
|
---|
6433 | fflush_all();
|
---|
6434 | rcode = x->b_function(argv);
|
---|
6435 | fflush_all();
|
---|
6436 | _exit(rcode);
|
---|
6437 | #else
|
---|
6438 | fflush_all();
|
---|
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 | }
|
---|
6449 |
|
---|
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]);
|
---|
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);
|
---|
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);
|
---|
6486 | }
|
---|
6487 | }
|
---|
6488 | #else
|
---|
6489 | # define dump_cmd_in_x_mode(argv) ((void)0)
|
---|
6490 | #endif
|
---|
6491 |
|
---|
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,
|
---|
6503 | * in particular stdin handling. Not sure why? -- because of vfork! (vda)
|
---|
6504 | */
|
---|
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)
|
---|
6511 | {
|
---|
6512 | char **new_env;
|
---|
6513 |
|
---|
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 |
|
---|
6526 | #if BB_MMU
|
---|
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 */
|
---|
6531 | #else
|
---|
6532 | nommu_save->new_env = new_env;
|
---|
6533 | nommu_save->old_vars = set_vars_and_save_old(new_env);
|
---|
6534 | #endif
|
---|
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);
|
---|
6565 | }
|
---|
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 | }
|
---|
6575 | #endif
|
---|
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]);
|
---|
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);
|
---|
6593 | execv(bb_busybox_exec_path, argv);
|
---|
6594 | /* If they called chroot or otherwise made the binary no longer
|
---|
6595 | * executable, fall through */
|
---|
6596 | }
|
---|
6597 | }
|
---|
6598 | #endif
|
---|
6599 |
|
---|
6600 | #if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
|
---|
6601 | skip:
|
---|
6602 | #endif
|
---|
6603 | execvp_or_die(argv);
|
---|
6604 | }
|
---|
6605 |
|
---|
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)
|
---|
6614 | {
|
---|
6615 | if (command->argv) {
|
---|
6616 | pseudo_exec_argv(nommu_save, command->argv,
|
---|
6617 | command->assignment_cnt, argv_expanded);
|
---|
6618 | }
|
---|
6619 |
|
---|
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 | }
|
---|
6643 |
|
---|
6644 | /* Case when we are here: ... | >file */
|
---|
6645 | debug_printf_exec("pseudo_exec'ed null command\n");
|
---|
6646 | _exit(EXIT_SUCCESS);
|
---|
6647 | }
|
---|
6648 |
|
---|
6649 | #if ENABLE_HUSH_JOB
|
---|
6650 | static const char *get_cmdtext(struct pipe *pi)
|
---|
6651 | {
|
---|
6652 | char **argv;
|
---|
6653 | char *p;
|
---|
6654 | int len;
|
---|
6655 |
|
---|
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;
|
---|
6665 | }
|
---|
6666 |
|
---|
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;
|
---|
6682 | }
|
---|
6683 |
|
---|
6684 | static void insert_bg_job(struct pipe *pi)
|
---|
6685 | {
|
---|
6686 | struct pipe *job, **jobp;
|
---|
6687 | int i;
|
---|
6688 |
|
---|
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 */
|
---|
6708 | }
|
---|
6709 | job->cmdtext = xstrdup(get_cmdtext(pi));
|
---|
6710 |
|
---|
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;
|
---|
6714 | }
|
---|
6715 |
|
---|
6716 | static void remove_bg_job(struct pipe *pi)
|
---|
6717 | {
|
---|
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;
|
---|
6732 | }
|
---|
6733 |
|
---|
6734 | /* Remove a backgrounded job */
|
---|
6735 | static void delete_finished_bg_job(struct pipe *pi)
|
---|
6736 | {
|
---|
6737 | remove_bg_job(pi);
|
---|
6738 | free_pipe(pi);
|
---|
6739 | }
|
---|
6740 | #endif /* JOB */
|
---|
6741 |
|
---|
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;
|
---|
6770 | }
|
---|
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);
|
---|
6805 | }
|
---|
6806 | #endif
|
---|
6807 | break;
|
---|
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));
|
---|
6821 | #endif
|
---|
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*
|
---|
6835 | * process in pipe (prints just newline for SIGINT/SIGPIPE).
|
---|
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)
|
---|
6841 | /* TODO: use strsignal() instead for bash compat? but that's bloat... */
|
---|
6842 | puts(sig == SIGINT || sig == SIGPIPE ? "" : get_signame(sig));
|
---|
6843 | /* TODO: if (WCOREDUMP(status)) + " (core dumped)"; */
|
---|
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);
|
---|
6928 | }
|
---|
6929 | return rcode;
|
---|
6930 | }
|
---|
6931 | #endif
|
---|
6932 |
|
---|
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 } || ...
|
---|
6950 | * If it is, then we can run cmd as a builtin, NOFORK,
|
---|
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)
|
---|
6968 | {
|
---|
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;
|
---|
6987 |
|
---|
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;
|
---|
6996 |
|
---|
6997 | debug_printf_exec("run_pipe start: members:%d\n", pi->num_cmds);
|
---|
6998 | debug_enter();
|
---|
6999 |
|
---|
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;
|
---|
7046 | }
|
---|
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 | }
|
---|
7089 | }
|
---|
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
|
---|
7129 | }
|
---|
7130 |
|
---|
7131 | /* Expand the rest into (possibly) many strings each */
|
---|
7132 | #if ENABLE_HUSH_BASH_COMPAT
|
---|
7133 | if (command->cmd_type == CMD_SINGLEWORD_NOGLOB) {
|
---|
7134 | argv_expanded = expand_strvec_to_strvec_singleword_noglob(argv + command->assignment_cnt);
|
---|
7135 | } else
|
---|
7136 | #endif
|
---|
7137 | {
|
---|
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 | }
|
---|
7161 | }
|
---|
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]);
|
---|
7167 | fflush_all();
|
---|
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
|
---|
7186 | }
|
---|
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;
|
---|
7198 | }
|
---|
7199 |
|
---|
7200 | if (ENABLE_FEATURE_SH_NOFORK) {
|
---|
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 | }
|
---|
7211 | }
|
---|
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);
|
---|
7269 | }
|
---|
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);
|
---|
7278 | } else {
|
---|
7279 | xmove_fd(next_infd, 0);
|
---|
7280 | }
|
---|
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);
|
---|
7381 | return 1;
|
---|
7382 | }
|
---|
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);
|
---|
7393 | return 1;
|
---|
7394 | }
|
---|
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)
|
---|
7417 | break;
|
---|
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;
|
---|
7440 | goto dont_check_jobs_but_continue;
|
---|
7441 | }
|
---|
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;
|
---|
7452 | }
|
---|
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 | }
|
---|
7460 | #endif
|
---|
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);
|
---|
7489 | }
|
---|
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;
|
---|
7496 | }
|
---|
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 | }
|
---|
7508 | #endif
|
---|
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++;
|
---|
7532 | }
|
---|
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 | }
|
---|
7539 | #endif
|
---|
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);
|
---|
7566 | check_and_run_traps();
|
---|
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" */
|
---|
7579 | if (G.depth_break_continue != 0 || fbc == BC_BREAK) {
|
---|
7580 | checkjobs(NULL);
|
---|
7581 | break;
|
---|
7582 | }
|
---|
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 */
|
---|
7599 | check_and_run_traps();
|
---|
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");
|
---|
7608 | } else {
|
---|
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);
|
---|
7614 | check_and_run_traps();
|
---|
7615 | } else
|
---|
7616 | #endif
|
---|
7617 | { /* This one just waits for completion */
|
---|
7618 | rcode = checkjobs(pi);
|
---|
7619 | debug_printf_exec(": checkjobs exitcode %d\n", rcode);
|
---|
7620 | check_and_run_traps();
|
---|
7621 | }
|
---|
7622 | G.last_exitcode = rcode;
|
---|
7623 | }
|
---|
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
|
---|
7631 | check_jobs_and_continue:
|
---|
7632 | checkjobs(NULL);
|
---|
7633 | dont_check_jobs_but_continue: ;
|
---|
7634 | #if ENABLE_HUSH_LOOPS
|
---|
7635 | /* Beware of "while false; true; do ..."! */
|
---|
7636 | if (pi->next
|
---|
7637 | && (pi->next->res_word == RES_DO || pi->next->res_word == RES_DONE)
|
---|
7638 | /* check for RES_DONE is needed for "while ...; do \n done" case */
|
---|
7639 | ) {
|
---|
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");
|
---|
7645 | break;
|
---|
7646 | }
|
---|
7647 | }
|
---|
7648 | if (rword == RES_UNTIL) {
|
---|
7649 | if (!rcode) {
|
---|
7650 | debug_printf_exec(": until expr is true: breaking\n");
|
---|
7651 | break;
|
---|
7652 | }
|
---|
7653 | }
|
---|
7654 | }
|
---|
7655 | #endif
|
---|
7656 | } /* for (pi) */
|
---|
7657 |
|
---|
7658 | #if ENABLE_HUSH_JOB
|
---|
7659 | G.run_list_level--;
|
---|
7660 | #endif
|
---|
7661 | #if ENABLE_HUSH_LOOPS
|
---|
7662 | if (loop_top)
|
---|
7663 | G.depth_of_loop--;
|
---|
7664 | free(for_list);
|
---|
7665 | #endif
|
---|
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;
|
---|
7672 | }
|
---|
7673 |
|
---|
7674 | /* Select which version we will use */
|
---|
7675 | static int run_and_free_list(struct pipe *pi)
|
---|
7676 | {
|
---|
7677 | int rcode = 0;
|
---|
7678 | debug_printf_exec("run_and_free_list entered\n");
|
---|
7679 | if (!G.o_opt[OPT_O_NOEXEC]) {
|
---|
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);
|
---|
7688 | return rcode;
|
---|
7689 | }
|
---|
7690 |
|
---|
7691 |
|
---|
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 |
|
---|
7718 | /* Called a few times only (or even once if "sh -c") */
|
---|
7719 | static void install_special_sighandlers(void)
|
---|
7720 | {
|
---|
7721 | unsigned mask;
|
---|
7722 |
|
---|
7723 | /* Which signals are shell-special? */
|
---|
7724 | mask = (1 << SIGQUIT) | (1 << SIGCHLD);
|
---|
7725 | if (G_interactive_fd) {
|
---|
7726 | mask |= SPECIAL_INTERACTIVE_SIGS;
|
---|
7727 | if (G_saved_tty_pgrp) /* we have ctty, job control sigs work */
|
---|
7728 | mask |= SPECIAL_JOBSTOP_SIGS;
|
---|
7729 | }
|
---|
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);
|
---|
7735 | }
|
---|
7736 | }
|
---|
7737 |
|
---|
7738 | #if ENABLE_HUSH_JOB
|
---|
7739 | /* helper */
|
---|
7740 | /* Set handlers to restore tty pgrp and exit */
|
---|
7741 | static void install_fatal_sighandlers(void)
|
---|
7742 | {
|
---|
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)
|
---|
7753 | /* bash 3.2 seems to handle these just like 'fatal' ones */
|
---|
7754 | + (1 << SIGPIPE)
|
---|
7755 | + (1 << SIGALRM)
|
---|
7756 | /* if we are interactive, SIGHUP, SIGTERM and SIGINT are special sigs.
|
---|
7757 | * if we aren't interactive... but in this case
|
---|
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);
|
---|
7767 | }
|
---|
7768 | #endif
|
---|
7769 |
|
---|
7770 | static int set_mode(int state, char mode, const char *o_opt)
|
---|
7771 | {
|
---|
7772 | int idx;
|
---|
7773 | switch (mode) {
|
---|
7774 | case 'n':
|
---|
7775 | G.o_opt[OPT_O_NOEXEC] = state;
|
---|
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;
|
---|
7810 | int hush_main(int argc, char **argv)
|
---|
7811 | {
|
---|
7812 | enum {
|
---|
7813 | OPT_login = (1 << 0),
|
---|
7814 | };
|
---|
7815 | unsigned flags;
|
---|
7816 | int opt;
|
---|
7817 | unsigned builtin_argc;
|
---|
7818 | char **e;
|
---|
7819 | struct variable *cur_var;
|
---|
7820 | struct variable *shell_ver;
|
---|
7821 |
|
---|
7822 | INIT_G();
|
---|
7823 | if (EXIT_SUCCESS != 0) /* if EXIT_SUCCESS == 0, it is already done */
|
---|
7824 | G.last_exitcode = EXIT_SUCCESS;
|
---|
7825 |
|
---|
7826 | #if ENABLE_HUSH_FAST
|
---|
7827 | G.count_SIGCHLD++; /* ensure it is != G.handled_SIGCHLD */
|
---|
7828 | #endif
|
---|
7829 | #if !BB_MMU
|
---|
7830 | G.argv0_for_re_execing = argv[0];
|
---|
7831 | #endif
|
---|
7832 | /* Deal with HUSH_VERSION */
|
---|
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");
|
---|
7842 | unsetenv("HUSH_VERSION"); /* in case it exists in initial env */
|
---|
7843 | G.top_var = shell_ver;
|
---|
7844 | cur_var = G.top_var;
|
---|
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 | }
|
---|
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);
|
---|
7860 |
|
---|
7861 | /* Export PWD */
|
---|
7862 | set_pwd_var(/*exp:*/ 1);
|
---|
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 | }
|
---|
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 | */
|
---|
7906 | #endif
|
---|
7907 |
|
---|
7908 | #if ENABLE_FEATURE_EDITING
|
---|
7909 | G.line_input_state = new_line_input_t(FOR_SHELL);
|
---|
7910 | #endif
|
---|
7911 |
|
---|
7912 | /* Initialize some more globals to non-zero values */
|
---|
7913 | cmdedit_update_prompt();
|
---|
7914 |
|
---|
7915 | die_func = restore_ttypgrp_and__exit;
|
---|
7916 |
|
---|
7917 | /* Shell is non-interactive at first. We need to call
|
---|
7918 | * install_special_sighandlers() if we are going to execute "sh <script>",
|
---|
7919 | * "sh -c <cmds>" or login shell's /etc/profile and friends.
|
---|
7920 | * If we later decide that we are interactive, we run install_special_sighandlers()
|
---|
7921 | * in order to intercept (more) signals.
|
---|
7922 | */
|
---|
7923 |
|
---|
7924 | /* Parse options */
|
---|
7925 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */
|
---|
7926 | flags = (argv[0] && argv[0][0] == '-') ? OPT_login : 0;
|
---|
7927 | builtin_argc = 0;
|
---|
7928 | while (1) {
|
---|
7929 | opt = getopt(argc, argv, "+c:xinsl"
|
---|
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;
|
---|
7939 | switch (opt) {
|
---|
7940 | case 'c':
|
---|
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 |
|
---|
7961 | install_special_sighandlers();
|
---|
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 "" */
|
---|
7967 | fflush_all();
|
---|
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...]: $0 is ARG0 */
|
---|
7978 | install_special_sighandlers();
|
---|
7979 | parse_and_run_string(optarg);
|
---|
7980 | goto final_return;
|
---|
7981 | case 'i':
|
---|
7982 | /* Well, we cannot just declare interactiveness,
|
---|
7983 | * we have to have some stuff (ctty, etc) */
|
---|
7984 | /* G_interactive_fd++; */
|
---|
7985 | break;
|
---|
7986 | case 's':
|
---|
7987 | /* "-s" means "read from stdin", but this is how we always
|
---|
7988 | * operate, so simply do nothing here. */
|
---|
7989 | break;
|
---|
7990 | case 'l':
|
---|
7991 | flags |= OPT_login;
|
---|
7992 | break;
|
---|
7993 | #if !BB_MMU
|
---|
7994 | case '<': /* "big heredoc" support */
|
---|
7995 | full_write1_str(optarg);
|
---|
7996 | _exit(0);
|
---|
7997 | case '$': {
|
---|
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;
|
---|
8013 | install_special_sighandlers();
|
---|
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(""); */
|
---|
8018 | install_sighandler(sig, SIG_IGN);
|
---|
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;
|
---|
8047 | default:
|
---|
8048 | #ifndef BB_VER
|
---|
8049 | fprintf(stderr, "Usage: sh [FILE]...\n"
|
---|
8050 | " or: sh -c command [args]...\n\n");
|
---|
8051 | exit(EXIT_FAILURE);
|
---|
8052 | #else
|
---|
8053 | bb_show_usage();
|
---|
8054 | #endif
|
---|
8055 | }
|
---|
8056 | } /* option parsing loop */
|
---|
8057 |
|
---|
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 |
|
---|
8063 | if (!G.root_pid) {
|
---|
8064 | G.root_pid = getpid();
|
---|
8065 | G.root_ppid = getppid();
|
---|
8066 | }
|
---|
8067 |
|
---|
8068 | /* If we are login shell... */
|
---|
8069 | if (flags & OPT_login) {
|
---|
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));
|
---|
8075 | install_special_sighandlers();
|
---|
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 |
|
---|
8088 | if (G.global_argv[1]) {
|
---|
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 | */
|
---|
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]);
|
---|
8099 | close_on_exec_on(fileno(input));
|
---|
8100 | install_special_sighandlers();
|
---|
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.
|
---|
8109 | * NB: don't forget to (re)run install_special_sighandlers() as needed.
|
---|
8110 | */
|
---|
8111 |
|
---|
8112 | /* A shell is interactive if the '-i' flag was given,
|
---|
8113 | * or if all of the following conditions are met:
|
---|
8114 | * no -c command
|
---|
8115 | * no arguments remaining or the -s flag given
|
---|
8116 | * standard input is a terminal
|
---|
8117 | * standard output is a terminal
|
---|
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;
|
---|
8136 | }
|
---|
8137 | }
|
---|
8138 | // TODO: track & disallow any attempts of user
|
---|
8139 | // to (inadvertently) close/redirect G_interactive_fd
|
---|
8140 | }
|
---|
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 | }
|
---|
8159 | }
|
---|
8160 |
|
---|
8161 | /* Install more signal handlers */
|
---|
8162 | install_special_sighandlers();
|
---|
8163 |
|
---|
8164 | if (G_saved_tty_pgrp) {
|
---|
8165 | /* Set other signals to restore saved_tty_pgrp */
|
---|
8166 | install_fatal_sighandlers();
|
---|
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 | }
|
---|
8173 | enable_restore_tty_pgrp_on_exit();
|
---|
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
|
---|
8195 | } else {
|
---|
8196 | install_special_sighandlers();
|
---|
8197 | }
|
---|
8198 | #elif ENABLE_HUSH_INTERACTIVE
|
---|
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) {
|
---|
8203 | /* try to dup to any fd */
|
---|
8204 | G_interactive_fd = dup(STDIN_FILENO);
|
---|
8205 | if (G_interactive_fd < 0)
|
---|
8206 | /* give up */
|
---|
8207 | G_interactive_fd = 0;
|
---|
8208 | }
|
---|
8209 | }
|
---|
8210 | if (G_interactive_fd) {
|
---|
8211 | close_on_exec_on(G_interactive_fd);
|
---|
8212 | }
|
---|
8213 | install_special_sighandlers();
|
---|
8214 | #else
|
---|
8215 | /* We have interactiveness code disabled */
|
---|
8216 | install_special_sighandlers();
|
---|
8217 | #endif
|
---|
8218 | /* bash:
|
---|
8219 | * if interactive but not a login shell, sources ~/.bashrc
|
---|
8220 | * (--norc turns this off, --rcfile <file> overrides)
|
---|
8221 | */
|
---|
8222 |
|
---|
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 | );
|
---|
8231 | }
|
---|
8232 |
|
---|
8233 | parse_and_run_file(stdin);
|
---|
8234 |
|
---|
8235 | final_return:
|
---|
8236 | hush_exit(G.last_exitcode);
|
---|
8237 | }
|
---|
8238 |
|
---|
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.
|
---|
8350 | * We'll need to undo trap cleanup (it's inside execvp_or_die)
|
---|
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
|
---|
8368 | * EEE (then bash exits)
|
---|
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) {
|
---|
8547 | sighandler_t handler;
|
---|
8548 |
|
---|
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 |
|
---|
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);
|
---|
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 |
|
---|
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 |
|
---|
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 |
|
---|
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 | */
|
---|
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;
|
---|
8809 | const char *ifs;
|
---|
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;
|
---|
8819 | ifs = get_local_var_value("IFS"); /* can be NULL */
|
---|
8820 |
|
---|
8821 | again:
|
---|
8822 | r = shell_builtin_read(set_local_var_from_halves,
|
---|
8823 | argv,
|
---|
8824 | ifs,
|
---|
8825 | read_flags,
|
---|
8826 | opt_n,
|
---|
8827 | opt_p,
|
---|
8828 | opt_t,
|
---|
8829 | opt_u
|
---|
8830 | );
|
---|
8831 |
|
---|
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 |
|
---|
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 */
|
---|
8975 | /* POSIX: non-interactive shell should abort here,
|
---|
8976 | * not merely fail. So far no one complained :)
|
---|
8977 | */
|
---|
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
|
---|
8987 | if (argv[1])
|
---|
8988 | save_and_replace_G_args(&sv, argv);
|
---|
8989 |
|
---|
8990 | parse_and_run_file(input);
|
---|
8991 | fclose(input);
|
---|
8992 |
|
---|
8993 | if (argv[1])
|
---|
8994 | restore_G_args(&sv, argv);
|
---|
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 |
|
---|
9007 | rc = 1;
|
---|
9008 | mask = umask(0);
|
---|
9009 | argv = skip_dash_dash(argv);
|
---|
9010 | if (argv[0]) {
|
---|
9011 | mode_t old_mask = mask;
|
---|
9012 |
|
---|
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) {
|
---|
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]);
|
---|
9027 | rc = 0;
|
---|
9028 | }
|
---|
9029 | } else {
|
---|
9030 | /* Mimic bash */
|
---|
9031 | printf("%04o\n", (unsigned) mask);
|
---|
9032 | /* fall through and restore mask which we set to 0 */
|
---|
9033 | }
|
---|
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 | }
|
---|
9070 | #endif
|
---|
9071 | argv++;
|
---|
9072 | }
|
---|
9073 | return ret;
|
---|
9074 | }
|
---|
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;
|
---|
9080 | int status;
|
---|
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) {
|
---|
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);
|
---|
9125 | break;
|
---|
9126 | }
|
---|
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 */
|
---|
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) {
|
---|
9159 | ret = WEXITSTATUS(status);
|
---|
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
|
---|