[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini xargs implementation for busybox
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| 4 | * Options are supported: "-prtx -n max_arg -s max_chars -e[ouf_str]"
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| 5 | *
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| 6 | * (C) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru>
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| 7 | *
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| 8 | * Special thanks
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| 9 | * - Mark Whitley and Glenn McGrath for stimulus to rewrite :)
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| 10 | * - Mike Rendell <michael@cs.mun.ca>
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| 11 | * and David MacKenzie <djm@gnu.ai.mit.edu>.
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| 12 | *
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| 13 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 14 | *
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| 15 | * xargs is described in the Single Unix Specification v3 at
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| 16 | * http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html
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| 17 | *
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| 18 | */
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| 19 |
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| 20 | #include "busybox.h"
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| 21 | #include <stdio.h>
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| 22 | #include <stdlib.h>
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| 23 | #include <string.h>
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| 24 | #include <unistd.h>
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| 25 | #include <getopt.h>
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| 26 | #include <errno.h>
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| 27 | #include <fcntl.h>
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| 28 | #include <sys/types.h>
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| 29 | #include <sys/wait.h>
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| 30 |
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| 31 | /* COMPAT: SYSV version defaults size (and has a max value of) to 470.
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| 32 | We try to make it as large as possible. */
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| 33 | #if !defined(ARG_MAX) && defined(_SC_ARG_MAX)
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| 34 | #define ARG_MAX sysconf (_SC_ARG_MAX)
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| 35 | #endif
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| 36 | #ifndef ARG_MAX
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| 37 | #define ARG_MAX 470
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| 38 | #endif
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| 39 |
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| 40 |
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| 41 | #ifdef TEST
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| 42 | # ifndef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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| 43 | # define CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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| 44 | # endif
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| 45 | # ifndef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
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| 46 | # define CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
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| 47 | # endif
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| 48 | # ifndef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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| 49 | # define CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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| 50 | # endif
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| 51 | # ifndef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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| 52 | # define CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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| 53 | # endif
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| 54 | #endif
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| 55 |
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| 56 | /*
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| 57 | This function have special algorithm.
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| 58 | Don`t use fork and include to main!
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| 59 | */
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| 60 | static int xargs_exec(char *const *args)
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| 61 | {
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| 62 | pid_t p;
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| 63 | volatile int exec_errno = 0; /* shared vfork stack */
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| 64 |
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| 65 | if ((p = vfork()) >= 0) {
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| 66 | if (p == 0) {
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| 67 | /* vfork -- child */
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| 68 | execvp(args[0], args);
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| 69 | exec_errno = errno; /* set error to shared stack */
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| 70 | _exit(1);
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| 71 | } else {
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| 72 | /* vfork -- parent */
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| 73 | int status;
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| 74 |
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| 75 | while (wait(&status) == (pid_t) - 1)
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| 76 | if (errno != EINTR)
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| 77 | break;
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| 78 | if (exec_errno) {
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| 79 | errno = exec_errno;
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| 80 | bb_perror_msg("%s", args[0]);
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| 81 | return exec_errno == ENOENT ? 127 : 126;
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| 82 | } else {
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| 83 | if (WEXITSTATUS(status) == 255) {
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| 84 | bb_error_msg("%s: exited with status 255; aborting", args[0]);
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| 85 | return 124;
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| 86 | }
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| 87 | if (WIFSTOPPED(status)) {
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| 88 | bb_error_msg("%s: stopped by signal %d",
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| 89 | args[0], WSTOPSIG(status));
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| 90 | return 125;
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| 91 | }
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| 92 | if (WIFSIGNALED(status)) {
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| 93 | bb_error_msg("%s: terminated by signal %d",
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| 94 | args[0], WTERMSIG(status));
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| 95 | return 125;
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| 96 | }
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| 97 | if (WEXITSTATUS(status) != 0)
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| 98 | return 123;
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| 99 | return 0;
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| 100 | }
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| 101 | }
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| 102 | } else {
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| 103 | bb_perror_msg_and_die("vfork");
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| 104 | }
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| 105 | }
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| 106 |
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| 107 |
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| 108 | typedef struct xlist_s {
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| 109 | char *data;
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| 110 | size_t lenght;
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| 111 | struct xlist_s *link;
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| 112 | } xlist_t;
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| 113 |
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| 114 | static int eof_stdin_detected;
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| 115 |
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| 116 | #define ISBLANK(c) ((c) == ' ' || (c) == '\t')
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| 117 | #define ISSPACE(c) (ISBLANK (c) || (c) == '\n' || (c) == '\r' \
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| 118 | || (c) == '\f' || (c) == '\v')
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| 119 |
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| 120 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
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| 121 | static xlist_t *process_stdin(xlist_t * list_arg,
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| 122 | const char *eof_str, size_t mc, char *buf)
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| 123 | {
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| 124 | #define NORM 0
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| 125 | #define QUOTE 1
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| 126 | #define BACKSLASH 2
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| 127 | #define SPACE 4
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| 128 |
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| 129 | char *s = NULL; /* start word */
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| 130 | char *p = NULL; /* pointer to end word */
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| 131 | char q = 0; /* quote char */
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| 132 | char state = NORM;
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| 133 | char eof_str_detected = 0;
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| 134 | size_t line_l = 0; /* size loaded args line */
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| 135 | int c; /* current char */
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| 136 | xlist_t *cur;
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| 137 | xlist_t *prev;
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| 138 |
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| 139 | for (prev = cur = list_arg; cur; cur = cur->link) {
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| 140 | line_l += cur->lenght; /* previous allocated */
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| 141 | if (prev != cur)
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| 142 | prev = prev->link;
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| 143 | }
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| 144 |
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| 145 | while (!eof_stdin_detected) {
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| 146 | c = getchar();
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| 147 | if (c == EOF) {
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| 148 | eof_stdin_detected++;
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| 149 | if (s)
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| 150 | goto unexpected_eof;
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| 151 | break;
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| 152 | }
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| 153 | if (eof_str_detected)
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| 154 | continue;
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| 155 | if (state == BACKSLASH) {
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| 156 | state = NORM;
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| 157 | goto set;
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| 158 | } else if (state == QUOTE) {
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| 159 | if (c == q) {
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| 160 | q = 0;
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| 161 | state = NORM;
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| 162 | } else {
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| 163 | goto set;
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| 164 | }
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| 165 | } else { /* if(state == NORM) */
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| 166 |
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| 167 | if (ISSPACE(c)) {
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| 168 | if (s) {
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| 169 | unexpected_eof:
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| 170 | state = SPACE;
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| 171 | c = 0;
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| 172 | goto set;
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| 173 | }
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| 174 | } else {
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| 175 | if (s == NULL)
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| 176 | s = p = buf;
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| 177 | if (c == '\\') {
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| 178 | state = BACKSLASH;
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| 179 | } else if (c == '\'' || c == '"') {
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| 180 | q = c;
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| 181 | state = QUOTE;
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| 182 | } else {
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| 183 | set:
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| 184 | if ((size_t)(p - buf) >= mc)
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| 185 | bb_error_msg_and_die("argument line too long");
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| 186 | *p++ = c;
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| 187 | }
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| 188 | }
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| 189 | }
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| 190 | if (state == SPACE) { /* word's delimiter or EOF detected */
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| 191 | if (q) {
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| 192 | bb_error_msg_and_die("unmatched %s quote",
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| 193 | q == '\'' ? "single" : "double");
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| 194 | }
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| 195 | /* word loaded */
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| 196 | if (eof_str) {
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| 197 | eof_str_detected = strcmp(s, eof_str) == 0;
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| 198 | }
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| 199 | if (!eof_str_detected) {
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| 200 | size_t lenght = (p - buf);
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| 201 |
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| 202 | cur = xmalloc(sizeof(xlist_t) + lenght);
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| 203 | cur->data = memcpy(cur + 1, s, lenght);
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| 204 | cur->lenght = lenght;
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| 205 | cur->link = NULL;
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| 206 | if (prev == NULL) {
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| 207 | list_arg = cur;
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| 208 | } else {
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| 209 | prev->link = cur;
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| 210 | }
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| 211 | prev = cur;
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| 212 | line_l += lenght;
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| 213 | if (line_l > mc) {
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| 214 | /* stop memory usage :-) */
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| 215 | break;
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| 216 | }
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| 217 | }
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| 218 | s = NULL;
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| 219 | state = NORM;
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| 220 | }
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| 221 | }
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| 222 | return list_arg;
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| 223 | }
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| 224 | #else
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| 225 | /* The variant does not support single quotes, double quotes or backslash */
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| 226 | static xlist_t *process_stdin(xlist_t * list_arg,
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| 227 | const char *eof_str, size_t mc, char *buf)
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| 228 | {
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| 229 |
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| 230 | int c; /* current char */
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| 231 | int eof_str_detected = 0;
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| 232 | char *s = NULL; /* start word */
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| 233 | char *p = NULL; /* pointer to end word */
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| 234 | size_t line_l = 0; /* size loaded args line */
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| 235 | xlist_t *cur;
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| 236 | xlist_t *prev;
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| 237 |
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| 238 | for (prev = cur = list_arg; cur; cur = cur->link) {
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| 239 | line_l += cur->lenght; /* previous allocated */
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| 240 | if (prev != cur)
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| 241 | prev = prev->link;
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| 242 | }
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| 243 |
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| 244 | while (!eof_stdin_detected) {
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| 245 | c = getchar();
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| 246 | if (c == EOF) {
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| 247 | eof_stdin_detected++;
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| 248 | }
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| 249 | if (eof_str_detected)
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| 250 | continue;
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| 251 | if (c == EOF || ISSPACE(c)) {
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| 252 | if (s == NULL)
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| 253 | continue;
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| 254 | c = EOF;
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| 255 | }
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| 256 | if (s == NULL)
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| 257 | s = p = buf;
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| 258 | if ((p - buf) >= mc)
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| 259 | bb_error_msg_and_die("argument line too long");
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| 260 | *p++ = c == EOF ? 0 : c;
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| 261 | if (c == EOF) { /* word's delimiter or EOF detected */
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| 262 | /* word loaded */
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| 263 | if (eof_str) {
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| 264 | eof_str_detected = strcmp(s, eof_str) == 0;
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| 265 | }
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| 266 | if (!eof_str_detected) {
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| 267 | size_t lenght = (p - buf);
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| 268 |
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| 269 | cur = xmalloc(sizeof(xlist_t) + lenght);
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| 270 | cur->data = memcpy(cur + 1, s, lenght);
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| 271 | cur->lenght = lenght;
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| 272 | cur->link = NULL;
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| 273 | if (prev == NULL) {
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| 274 | list_arg = cur;
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| 275 | } else {
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| 276 | prev->link = cur;
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| 277 | }
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| 278 | prev = cur;
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| 279 | line_l += lenght;
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| 280 | if (line_l > mc) {
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| 281 | /* stop memory usage :-) */
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| 282 | break;
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| 283 | }
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| 284 | s = NULL;
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| 285 | }
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| 286 | }
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| 287 | }
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| 288 | return list_arg;
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| 289 | }
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| 290 | #endif /* CONFIG_FEATURE_XARGS_SUPPORT_QUOTES */
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| 291 |
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| 292 |
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| 293 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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| 294 | /* Prompt the user for a response, and
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| 295 | if the user responds affirmatively, return true;
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| 296 | otherwise, return false. Used "/dev/tty", not stdin. */
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| 297 | static int xargs_ask_confirmation(void)
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| 298 | {
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| 299 | static FILE *tty_stream;
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| 300 | int c, savec;
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| 301 |
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| 302 | if (!tty_stream) {
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| 303 | tty_stream = bb_xfopen(CURRENT_TTY, "r");
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| 304 | /* pranoidal security by vodz */
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| 305 | fcntl(fileno(tty_stream), F_SETFD, FD_CLOEXEC);
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| 306 | }
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| 307 | fputs(" ?...", stderr);
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| 308 | fflush(stderr);
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| 309 | c = savec = getc(tty_stream);
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| 310 | while (c != EOF && c != '\n')
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| 311 | c = getc(tty_stream);
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| 312 | if (savec == 'y' || savec == 'Y')
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| 313 | return 1;
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| 314 | return 0;
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| 315 | }
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| 316 |
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| 317 | # define OPT_INC_P 1
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| 318 | #else
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| 319 | # define OPT_INC_P 0
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| 320 | # define xargs_ask_confirmation() 1
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| 321 | #endif /* CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION */
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| 322 |
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| 323 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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| 324 | # define OPT_INC_X 1
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| 325 | #else
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| 326 | # define OPT_INC_X 0
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| 327 | #endif
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| 328 |
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| 329 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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| 330 | static xlist_t *process0_stdin(xlist_t * list_arg, const char *eof_str ATTRIBUTE_UNUSED,
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| 331 | size_t mc, char *buf)
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| 332 | {
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| 333 | int c; /* current char */
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| 334 | char *s = NULL; /* start word */
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| 335 | char *p = NULL; /* pointer to end word */
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| 336 | size_t line_l = 0; /* size loaded args line */
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| 337 | xlist_t *cur;
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| 338 | xlist_t *prev;
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| 339 |
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| 340 | for (prev = cur = list_arg; cur; cur = cur->link) {
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| 341 | line_l += cur->lenght; /* previous allocated */
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| 342 | if (prev != cur)
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| 343 | prev = prev->link;
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| 344 | }
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| 345 |
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| 346 | while (!eof_stdin_detected) {
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| 347 | c = getchar();
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| 348 | if (c == EOF) {
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| 349 | eof_stdin_detected++;
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| 350 | if (s == NULL)
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| 351 | break;
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| 352 | c = 0;
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| 353 | }
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| 354 | if (s == NULL)
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| 355 | s = p = buf;
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| 356 | if ((size_t)(p - buf) >= mc)
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| 357 | bb_error_msg_and_die("argument line too long");
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| 358 | *p++ = c;
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| 359 | if (c == 0) { /* word's delimiter or EOF detected */
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| 360 | /* word loaded */
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| 361 | size_t lenght = (p - buf);
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| 362 |
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| 363 | cur = xmalloc(sizeof(xlist_t) + lenght);
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| 364 | cur->data = memcpy(cur + 1, s, lenght);
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| 365 | cur->lenght = lenght;
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| 366 | cur->link = NULL;
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| 367 | if (prev == NULL) {
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| 368 | list_arg = cur;
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| 369 | } else {
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| 370 | prev->link = cur;
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| 371 | }
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| 372 | prev = cur;
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| 373 | line_l += lenght;
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| 374 | if (line_l > mc) {
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| 375 | /* stop memory usage :-) */
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| 376 | break;
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| 377 | }
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| 378 | s = NULL;
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| 379 | }
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| 380 | }
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| 381 | return list_arg;
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| 382 | }
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| 383 |
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| 384 | # define READ_ARGS(l, e, nmc, mc) (*read_args)(l, e, nmc, mc)
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| 385 | # define OPT_INC_0 1 /* future use */
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| 386 | #else
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| 387 | # define OPT_INC_0 0 /* future use */
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| 388 | # define READ_ARGS(l, e, nmc, mc) process_stdin(l, e, nmc, mc)
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| 389 | #endif /* CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM */
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| 390 |
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| 391 |
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| 392 | #define OPT_VERBOSE (1<<0)
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| 393 | #define OPT_NO_EMPTY (1<<1)
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| 394 | #define OPT_UPTO_NUMBER (1<<2)
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| 395 | #define OPT_UPTO_SIZE (1<<3)
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| 396 | #define OPT_EOF_STRING (1<<4)
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| 397 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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| 398 | #define OPT_INTERACTIVE (1<<5)
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| 399 | #else
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| 400 | #define OPT_INTERACTIVE (0) /* require for algorithm &| */
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| 401 | #endif
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| 402 | #define OPT_TERMINATE (1<<(5+OPT_INC_P))
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| 403 | #define OPT_ZEROTERM (1<<(5+OPT_INC_P+OPT_INC_X))
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| 404 | /* next future
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| 405 | #define OPT_NEXT_OTHER (1<<(5+OPT_INC_P+OPT_INC_X+OPT_INC_0))
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| 406 | */
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| 407 |
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| 408 | int xargs_main(int argc, char **argv)
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| 409 | {
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| 410 | char **args;
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| 411 | int i, a, n;
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| 412 | xlist_t *list = NULL;
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| 413 | xlist_t *cur;
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| 414 | int child_error = 0;
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| 415 | char *max_args, *max_chars;
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| 416 | int n_max_arg;
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| 417 | size_t n_chars = 0;
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| 418 | long orig_arg_max;
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| 419 | const char *eof_str = "_";
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| 420 | unsigned long opt;
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| 421 | size_t n_max_chars;
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| 422 |
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| 423 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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| 424 | xlist_t *(*read_args) (xlist_t *, const char *, size_t, char *) = process_stdin;
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| 425 | #endif
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| 426 |
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| 427 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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| 428 | bb_opt_complementally = "pt";
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| 429 | #endif
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| 430 |
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| 431 | opt = bb_getopt_ulflags(argc, argv, "+trn:s:e::"
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| 432 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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| 433 | "p"
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| 434 | #endif
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| 435 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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| 436 | "x"
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| 437 | #endif
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| 438 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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| 439 | "0"
|
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| 440 | #endif
|
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| 441 | ,&max_args, &max_chars, &eof_str);
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| 442 |
|
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| 443 | a = argc - optind;
|
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| 444 | argv += optind;
|
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| 445 | if (a == 0) {
|
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| 446 | /* default behavior is to echo all the filenames */
|
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| 447 | *argv = "echo";
|
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| 448 | a++;
|
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| 449 | }
|
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| 450 |
|
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| 451 | orig_arg_max = ARG_MAX;
|
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| 452 | if (orig_arg_max == -1)
|
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| 453 | orig_arg_max = LONG_MAX;
|
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| 454 | orig_arg_max -= 2048; /* POSIX.2 requires subtracting 2048. */
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| 455 | if ((opt & OPT_UPTO_SIZE)) {
|
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| 456 | n_max_chars = bb_xgetularg10_bnd(max_chars, 1, orig_arg_max);
|
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| 457 | for (i = 0; i < a; i++) {
|
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| 458 | n_chars += strlen(*argv) + 1;
|
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| 459 | }
|
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| 460 | if (n_max_chars < n_chars) {
|
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| 461 | bb_error_msg_and_die("can not fit single argument within argument list size limit");
|
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| 462 | }
|
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| 463 | n_max_chars -= n_chars;
|
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| 464 | } else {
|
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| 465 | /* Sanity check for systems with huge ARG_MAX defines (e.g., Suns which
|
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| 466 | have it at 1 meg). Things will work fine with a large ARG_MAX but it
|
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| 467 | will probably hurt the system more than it needs to; an array of this
|
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| 468 | size is allocated. */
|
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| 469 | if (orig_arg_max > 20 * 1024)
|
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| 470 | orig_arg_max = 20 * 1024;
|
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| 471 | n_max_chars = orig_arg_max;
|
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| 472 | }
|
---|
| 473 | max_chars = xmalloc(n_max_chars);
|
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| 474 |
|
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| 475 | if ((opt & OPT_UPTO_NUMBER)) {
|
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| 476 | n_max_arg = bb_xgetularg10_bnd(max_args, 1, INT_MAX);
|
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| 477 | } else {
|
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| 478 | n_max_arg = n_max_chars;
|
---|
| 479 | }
|
---|
| 480 |
|
---|
| 481 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
|
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| 482 | if (opt & OPT_ZEROTERM)
|
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| 483 | read_args = process0_stdin;
|
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| 484 | #endif
|
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| 485 |
|
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| 486 | while ((list = READ_ARGS(list, eof_str, n_max_chars, max_chars)) != NULL ||
|
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| 487 | (opt & OPT_NO_EMPTY) == 0)
|
---|
| 488 | {
|
---|
| 489 | opt |= OPT_NO_EMPTY;
|
---|
| 490 | n = 0;
|
---|
| 491 | n_chars = 0;
|
---|
| 492 | #ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
|
---|
| 493 | for (cur = list; cur;) {
|
---|
| 494 | n_chars += cur->lenght;
|
---|
| 495 | n++;
|
---|
| 496 | cur = cur->link;
|
---|
| 497 | if (n_chars > n_max_chars || (n == n_max_arg && cur)) {
|
---|
| 498 | if (opt & OPT_TERMINATE)
|
---|
| 499 | bb_error_msg_and_die("argument list too long");
|
---|
| 500 | break;
|
---|
| 501 | }
|
---|
| 502 | }
|
---|
| 503 | #else
|
---|
| 504 | for (cur = list; cur; cur = cur->link) {
|
---|
| 505 | n_chars += cur->lenght;
|
---|
| 506 | n++;
|
---|
| 507 | if (n_chars > n_max_chars || n == n_max_arg) {
|
---|
| 508 | break;
|
---|
| 509 | }
|
---|
| 510 | }
|
---|
| 511 | #endif /* CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT */
|
---|
| 512 |
|
---|
| 513 | /* allocating pointers for execvp:
|
---|
| 514 | a*arg, n*arg from stdin, NULL */
|
---|
| 515 | args = xcalloc(n + a + 1, sizeof(char *));
|
---|
| 516 |
|
---|
| 517 | /* Store the command to be executed
|
---|
| 518 | (taken from the command line) */
|
---|
| 519 | for (i = 0; i < a; i++)
|
---|
| 520 | args[i] = argv[i];
|
---|
| 521 | /* (taken from stdin) */
|
---|
| 522 | for (cur = list; n; cur = cur->link) {
|
---|
| 523 | args[i++] = cur->data;
|
---|
| 524 | n--;
|
---|
| 525 | }
|
---|
| 526 |
|
---|
| 527 | if ((opt & (OPT_INTERACTIVE | OPT_VERBOSE))) {
|
---|
| 528 | for (i = 0; args[i]; i++) {
|
---|
| 529 | if (i)
|
---|
| 530 | fputc(' ', stderr);
|
---|
| 531 | fputs(args[i], stderr);
|
---|
| 532 | }
|
---|
| 533 | if ((opt & OPT_INTERACTIVE) == 0)
|
---|
| 534 | fputc('\n', stderr);
|
---|
| 535 | }
|
---|
| 536 | if ((opt & OPT_INTERACTIVE) == 0 || xargs_ask_confirmation() != 0) {
|
---|
| 537 | child_error = xargs_exec(args);
|
---|
| 538 | }
|
---|
| 539 |
|
---|
| 540 | /* clean up */
|
---|
| 541 | for (i = a; args[i]; i++) {
|
---|
| 542 | cur = list;
|
---|
| 543 | list = list->link;
|
---|
| 544 | free(cur);
|
---|
| 545 | }
|
---|
| 546 | free(args);
|
---|
| 547 | if (child_error > 0 && child_error != 123) {
|
---|
| 548 | break;
|
---|
| 549 | }
|
---|
| 550 | }
|
---|
| 551 | #ifdef CONFIG_FEATURE_CLEAN_UP
|
---|
| 552 | free(max_chars);
|
---|
| 553 | #endif
|
---|
| 554 | return child_error;
|
---|
| 555 | }
|
---|
| 556 |
|
---|
| 557 |
|
---|
| 558 | #ifdef TEST
|
---|
| 559 |
|
---|
| 560 | const char *bb_applet_name = "debug stuff usage";
|
---|
| 561 |
|
---|
| 562 | void bb_show_usage(void)
|
---|
| 563 | {
|
---|
| 564 | fprintf(stderr, "Usage: %s [-p] [-r] [-t] -[x] [-n max_arg] [-s max_chars]\n",
|
---|
| 565 | bb_applet_name);
|
---|
| 566 | exit(1);
|
---|
| 567 | }
|
---|
| 568 |
|
---|
| 569 | int main(int argc, char **argv)
|
---|
| 570 | {
|
---|
| 571 | return xargs_main(argc, argv);
|
---|
| 572 | }
|
---|
| 573 | #endif /* TEST */
|
---|