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db8cbc6a7a
This patch replaces the fork+exec by posix_spawn on wordexp, which allows a better scability on Linux and simplifies the thread cancellation handling. The only change which can not be implemented with posix_spawn the /dev/null check to certify it is indeed the expected device. I am not sure how effetive this check is since /dev/null tampering means something very wrong with the system and this is the least of the issues. My view is the tests is really out of the place and the hardening provided is minimum. If the idea is still to provide such check, I think a possibilty would be to open /dev/null, check it, add a dup2 file action, and close the file descriptor. Checked on powerpc64le-linux-gnu and x86_64-linux-gnu. * include/spawn.h (__posix_spawn_file_actions_addopen): New prototype. * posix/spawn_faction_addopen.c (posix_spawn_file_actions_addopen): Add internal alias. * posix/wordexp.c (create_environment, free_environment): New functions. (exec_comm_child, exec_comm): Use posix_spawn instead of fork+exec. * posix/wordexp-test.c: Use libsupport.
2437 lines
52 KiB
C
2437 lines
52 KiB
C
/* POSIX.2 wordexp implementation.
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Copyright (C) 1997-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Tim Waugh <tim@cyberelk.demon.co.uk>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <glob.h>
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#include <libintl.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <wordexp.h>
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#include <spawn.h>
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#include <scratch_buffer.h>
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#include <_itoa.h>
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#include <assert.h>
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/*
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* This is a recursive-descent-style word expansion routine.
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*/
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/* These variables are defined and initialized in the startup code. */
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extern int __libc_argc attribute_hidden;
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extern char **__libc_argv attribute_hidden;
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/* Some forward declarations */
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static int parse_dollars (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset, int flags,
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wordexp_t *pwordexp, const char *ifs,
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const char *ifs_white, int quoted);
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static int parse_backtick (char **word, size_t *word_length,
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size_t *max_length, const char *words,
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size_t *offset, int flags, wordexp_t *pwordexp,
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const char *ifs, const char *ifs_white);
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static int parse_dquote (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset, int flags,
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wordexp_t *pwordexp, const char *ifs,
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const char *ifs_white);
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static int eval_expr (char *expr, long int *result);
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/* The w_*() functions manipulate word lists. */
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#define W_CHUNK (100)
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/* Result of w_newword will be ignored if it's the last word. */
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static inline char *
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w_newword (size_t *actlen, size_t *maxlen)
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{
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*actlen = *maxlen = 0;
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return NULL;
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}
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static char *
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w_addchar (char *buffer, size_t *actlen, size_t *maxlen, char ch)
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/* (lengths exclude trailing zero) */
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{
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/* Add a character to the buffer, allocating room for it if needed. */
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if (*actlen == *maxlen)
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{
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char *old_buffer = buffer;
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assert (buffer == NULL || *maxlen != 0);
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*maxlen += W_CHUNK;
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buffer = (char *) realloc (buffer, 1 + *maxlen);
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if (buffer == NULL)
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free (old_buffer);
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}
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if (buffer != NULL)
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{
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buffer[*actlen] = ch;
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buffer[++(*actlen)] = '\0';
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}
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return buffer;
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}
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static char *
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w_addmem (char *buffer, size_t *actlen, size_t *maxlen, const char *str,
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size_t len)
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{
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/* Add a string to the buffer, allocating room for it if needed.
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*/
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if (*actlen + len > *maxlen)
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{
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char *old_buffer = buffer;
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assert (buffer == NULL || *maxlen != 0);
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*maxlen += MAX (2 * len, W_CHUNK);
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buffer = realloc (old_buffer, 1 + *maxlen);
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if (buffer == NULL)
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free (old_buffer);
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}
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if (buffer != NULL)
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{
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*((char *) __mempcpy (&buffer[*actlen], str, len)) = '\0';
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*actlen += len;
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}
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return buffer;
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}
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static char *
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w_addstr (char *buffer, size_t *actlen, size_t *maxlen, const char *str)
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/* (lengths exclude trailing zero) */
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{
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/* Add a string to the buffer, allocating room for it if needed.
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*/
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size_t len;
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assert (str != NULL); /* w_addstr only called from this file */
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len = strlen (str);
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return w_addmem (buffer, actlen, maxlen, str, len);
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}
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static int
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w_addword (wordexp_t *pwordexp, char *word)
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{
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/* Add a word to the wordlist */
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size_t num_p;
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char **new_wordv;
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bool allocated = false;
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/* Internally, NULL acts like "". Convert NULLs to "" before
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* the caller sees them.
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*/
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if (word == NULL)
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{
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word = __strdup ("");
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if (word == NULL)
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goto no_space;
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allocated = true;
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}
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num_p = 2 + pwordexp->we_wordc + pwordexp->we_offs;
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new_wordv = realloc (pwordexp->we_wordv, sizeof (char *) * num_p);
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if (new_wordv != NULL)
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{
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pwordexp->we_wordv = new_wordv;
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pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc++] = word;
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pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc] = NULL;
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return 0;
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}
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if (allocated)
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free (word);
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no_space:
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return WRDE_NOSPACE;
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}
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/* The parse_*() functions should leave *offset being the offset in 'words'
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* to the last character processed.
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*/
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static int
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parse_backslash (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset)
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{
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/* We are poised _at_ a backslash, not in quotes */
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switch (words[1 + *offset])
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{
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case 0:
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/* Backslash is last character of input words */
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return WRDE_SYNTAX;
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case '\n':
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++(*offset);
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break;
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default:
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*word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
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if (*word == NULL)
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return WRDE_NOSPACE;
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++(*offset);
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break;
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}
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return 0;
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}
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static int
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parse_qtd_backslash (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset)
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{
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/* We are poised _at_ a backslash, inside quotes */
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switch (words[1 + *offset])
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{
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case 0:
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/* Backslash is last character of input words */
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return WRDE_SYNTAX;
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case '\n':
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++(*offset);
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break;
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case '$':
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case '`':
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case '"':
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case '\\':
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*word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
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if (*word == NULL)
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return WRDE_NOSPACE;
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++(*offset);
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break;
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default:
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*word = w_addchar (*word, word_length, max_length, words[*offset]);
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if (*word != NULL)
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*word = w_addchar (*word, word_length, max_length, words[1 + *offset]);
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if (*word == NULL)
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return WRDE_NOSPACE;
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++(*offset);
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break;
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}
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return 0;
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}
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static int
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parse_tilde (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset, size_t wordc)
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{
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/* We are poised _at_ a tilde */
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size_t i;
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if (*word_length != 0)
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{
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if (!((*word)[*word_length - 1] == '=' && wordc == 0))
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{
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if (!((*word)[*word_length - 1] == ':'
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&& strchr (*word, '=') && wordc == 0))
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{
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*word = w_addchar (*word, word_length, max_length, '~');
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return *word ? 0 : WRDE_NOSPACE;
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}
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}
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}
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for (i = 1 + *offset; words[i]; i++)
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{
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if (words[i] == ':' || words[i] == '/' || words[i] == ' '
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|| words[i] == '\t' || words[i] == 0 )
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break;
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if (words[i] == '\\')
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{
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*word = w_addchar (*word, word_length, max_length, '~');
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return *word ? 0 : WRDE_NOSPACE;
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}
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}
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if (i == 1 + *offset)
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{
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/* Tilde appears on its own */
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char* home;
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/* POSIX.2 says ~ expands to $HOME and if HOME is unset the
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results are unspecified. We do a lookup on the uid if
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HOME is unset. */
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home = getenv ("HOME");
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if (home != NULL)
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{
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*word = w_addstr (*word, word_length, max_length, home);
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if (*word == NULL)
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return WRDE_NOSPACE;
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}
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else
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{
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struct passwd pwd, *tpwd;
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uid_t uid = __getuid ();
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int result;
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struct scratch_buffer tmpbuf;
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scratch_buffer_init (&tmpbuf);
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while ((result = __getpwuid_r (uid, &pwd,
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tmpbuf.data, tmpbuf.length,
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&tpwd)) != 0
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&& errno == ERANGE)
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if (!scratch_buffer_grow (&tmpbuf))
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return WRDE_NOSPACE;
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if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL)
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{
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*word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
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if (*word == NULL)
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{
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scratch_buffer_free (&tmpbuf);
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return WRDE_NOSPACE;
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}
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}
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else
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{
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*word = w_addchar (*word, word_length, max_length, '~');
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if (*word == NULL)
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{
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scratch_buffer_free (&tmpbuf);
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return WRDE_NOSPACE;
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}
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}
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scratch_buffer_free (&tmpbuf);
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}
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}
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else
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{
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/* Look up user name in database to get home directory */
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char *user = strndupa (&words[1 + *offset], i - (1 + *offset));
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struct passwd pwd, *tpwd;
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int result;
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struct scratch_buffer tmpbuf;
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scratch_buffer_init (&tmpbuf);
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while ((result = __getpwnam_r (user, &pwd, tmpbuf.data, tmpbuf.length,
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&tpwd)) != 0
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&& errno == ERANGE)
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if (!scratch_buffer_grow (&tmpbuf))
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return WRDE_NOSPACE;
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if (result == 0 && tpwd != NULL && pwd.pw_dir)
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*word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
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else
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{
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/* (invalid login name) */
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*word = w_addchar (*word, word_length, max_length, '~');
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if (*word != NULL)
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*word = w_addstr (*word, word_length, max_length, user);
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}
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scratch_buffer_free (&tmpbuf);
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*offset = i - 1;
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}
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return *word ? 0 : WRDE_NOSPACE;
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}
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static int
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do_parse_glob (const char *glob_word, char **word, size_t *word_length,
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size_t *max_length, wordexp_t *pwordexp, const char *ifs,
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const char *ifs_white)
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{
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int error;
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unsigned int match;
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glob_t globbuf;
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error = glob (glob_word, GLOB_NOCHECK, NULL, &globbuf);
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if (error != 0)
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{
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/* We can only run into memory problems. */
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assert (error == GLOB_NOSPACE);
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return WRDE_NOSPACE;
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}
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if (ifs && !*ifs)
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{
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/* No field splitting allowed. */
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assert (globbuf.gl_pathv[0] != NULL);
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*word = w_addstr (*word, word_length, max_length, globbuf.gl_pathv[0]);
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for (match = 1; match < globbuf.gl_pathc && *word != NULL; ++match)
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{
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*word = w_addchar (*word, word_length, max_length, ' ');
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if (*word != NULL)
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*word = w_addstr (*word, word_length, max_length,
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globbuf.gl_pathv[match]);
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}
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globfree (&globbuf);
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return *word ? 0 : WRDE_NOSPACE;
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}
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assert (ifs == NULL || *ifs != '\0');
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if (*word != NULL)
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{
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free (*word);
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*word = w_newword (word_length, max_length);
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}
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for (match = 0; match < globbuf.gl_pathc; ++match)
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{
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char *matching_word = __strdup (globbuf.gl_pathv[match]);
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if (matching_word == NULL || w_addword (pwordexp, matching_word))
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{
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globfree (&globbuf);
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return WRDE_NOSPACE;
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}
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}
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globfree (&globbuf);
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return 0;
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}
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static int
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parse_glob (char **word, size_t *word_length, size_t *max_length,
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const char *words, size_t *offset, int flags,
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wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
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{
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/* We are poised just after a '*', a '[' or a '?'. */
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int error = WRDE_NOSPACE;
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int quoted = 0; /* 1 if singly-quoted, 2 if doubly */
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size_t i;
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wordexp_t glob_list; /* List of words to glob */
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glob_list.we_wordc = 0;
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glob_list.we_wordv = NULL;
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glob_list.we_offs = 0;
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for (; words[*offset] != '\0'; ++*offset)
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{
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if (strchr (ifs, words[*offset]) != NULL)
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/* Reached IFS */
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break;
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|
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/* Sort out quoting */
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if (words[*offset] == '\'')
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{
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if (quoted == 0)
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{
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quoted = 1;
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continue;
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}
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else if (quoted == 1)
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{
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quoted = 0;
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continue;
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}
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}
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else if (words[*offset] == '"')
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{
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if (quoted == 0)
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{
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quoted = 2;
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continue;
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}
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else if (quoted == 2)
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{
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quoted = 0;
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continue;
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}
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}
|
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|
|
/* Sort out other special characters */
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if (quoted != 1 && words[*offset] == '$')
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{
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error = parse_dollars (word, word_length, max_length, words,
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offset, flags, &glob_list, ifs, ifs_white,
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quoted == 2);
|
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if (error)
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goto tidy_up;
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|
|
continue;
|
|
}
|
|
else if (words[*offset] == '\\')
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|
{
|
|
if (quoted)
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error = parse_qtd_backslash (word, word_length, max_length,
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words, offset);
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else
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error = parse_backslash (word, word_length, max_length,
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words, offset);
|
|
|
|
if (error)
|
|
goto tidy_up;
|
|
|
|
continue;
|
|
}
|
|
|
|
*word = w_addchar (*word, word_length, max_length, words[*offset]);
|
|
if (*word == NULL)
|
|
goto tidy_up;
|
|
}
|
|
|
|
/* Don't forget to re-parse the character we stopped at. */
|
|
--*offset;
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|
|
|
/* Glob the words */
|
|
error = w_addword (&glob_list, *word);
|
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*word = w_newword (word_length, max_length);
|
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for (i = 0; error == 0 && i < glob_list.we_wordc; i++)
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error = do_parse_glob (glob_list.we_wordv[i], word, word_length,
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max_length, pwordexp, ifs, ifs_white);
|
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|
|
/* Now tidy up */
|
|
tidy_up:
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|
wordfree (&glob_list);
|
|
return error;
|
|
}
|
|
|
|
static int
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|
parse_squote (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset)
|
|
{
|
|
/* We are poised just after a single quote */
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
if (words[*offset] != '\'')
|
|
{
|
|
*word = w_addchar (*word, word_length, max_length, words[*offset]);
|
|
if (*word == NULL)
|
|
return WRDE_NOSPACE;
|
|
}
|
|
else return 0;
|
|
}
|
|
|
|
/* Unterminated string */
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
/* Functions to evaluate an arithmetic expression */
|
|
static int
|
|
eval_expr_val (char **expr, long int *result)
|
|
{
|
|
char *digit;
|
|
|
|
/* Skip white space */
|
|
for (digit = *expr; digit && *digit && isspace (*digit); ++digit);
|
|
|
|
if (*digit == '(')
|
|
{
|
|
/* Scan for closing paren */
|
|
for (++digit; **expr && **expr != ')'; ++(*expr));
|
|
|
|
/* Is there one? */
|
|
if (!**expr)
|
|
return WRDE_SYNTAX;
|
|
|
|
*(*expr)++ = 0;
|
|
|
|
if (eval_expr (digit, result))
|
|
return WRDE_SYNTAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* POSIX requires that decimal, octal, and hexadecimal constants are
|
|
recognized. Therefore we pass 0 as the third parameter to strtol. */
|
|
*result = strtol (digit, expr, 0);
|
|
if (digit == *expr)
|
|
return WRDE_SYNTAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
eval_expr_multdiv (char **expr, long int *result)
|
|
{
|
|
long int arg;
|
|
|
|
/* Read a Value */
|
|
if (eval_expr_val (expr, result) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
while (**expr)
|
|
{
|
|
/* Skip white space */
|
|
for (; *expr && **expr && isspace (**expr); ++(*expr));
|
|
|
|
if (**expr == '*')
|
|
{
|
|
++(*expr);
|
|
if (eval_expr_val (expr, &arg) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
*result *= arg;
|
|
}
|
|
else if (**expr == '/')
|
|
{
|
|
++(*expr);
|
|
if (eval_expr_val (expr, &arg) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
/* Division by zero or integer overflow. */
|
|
if (arg == 0 || (arg == -1 && *result == LONG_MIN))
|
|
return WRDE_SYNTAX;
|
|
|
|
*result /= arg;
|
|
}
|
|
else break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
eval_expr (char *expr, long int *result)
|
|
{
|
|
long int arg;
|
|
|
|
/* Read a Multdiv */
|
|
if (eval_expr_multdiv (&expr, result) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
while (*expr)
|
|
{
|
|
/* Skip white space */
|
|
for (; expr && *expr && isspace (*expr); ++expr);
|
|
|
|
if (*expr == '+')
|
|
{
|
|
++expr;
|
|
if (eval_expr_multdiv (&expr, &arg) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
*result += arg;
|
|
}
|
|
else if (*expr == '-')
|
|
{
|
|
++expr;
|
|
if (eval_expr_multdiv (&expr, &arg) != 0)
|
|
return WRDE_SYNTAX;
|
|
|
|
*result -= arg;
|
|
}
|
|
else break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
parse_arith (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags, int bracket)
|
|
{
|
|
/* We are poised just after "$((" or "$[" */
|
|
int error;
|
|
int paren_depth = 1;
|
|
size_t expr_length;
|
|
size_t expr_maxlen;
|
|
char *expr;
|
|
|
|
expr = w_newword (&expr_length, &expr_maxlen);
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
switch (words[*offset])
|
|
{
|
|
case '$':
|
|
error = parse_dollars (&expr, &expr_length, &expr_maxlen,
|
|
words, offset, flags, NULL, NULL, NULL, 1);
|
|
/* The ``1'' here is to tell parse_dollars not to
|
|
* split the fields.
|
|
*/
|
|
if (error)
|
|
{
|
|
free (expr);
|
|
return error;
|
|
}
|
|
break;
|
|
|
|
case '`':
|
|
(*offset)++;
|
|
error = parse_backtick (&expr, &expr_length, &expr_maxlen,
|
|
words, offset, flags, NULL, NULL, NULL);
|
|
/* The first NULL here is to tell parse_backtick not to
|
|
* split the fields.
|
|
*/
|
|
if (error)
|
|
{
|
|
free (expr);
|
|
return error;
|
|
}
|
|
break;
|
|
|
|
case '\\':
|
|
error = parse_qtd_backslash (&expr, &expr_length, &expr_maxlen,
|
|
words, offset);
|
|
if (error)
|
|
{
|
|
free (expr);
|
|
return error;
|
|
}
|
|
/* I think that a backslash within an
|
|
* arithmetic expansion is bound to
|
|
* cause an error sooner or later anyway though.
|
|
*/
|
|
break;
|
|
|
|
case ')':
|
|
if (--paren_depth == 0)
|
|
{
|
|
char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
|
|
long int numresult = 0;
|
|
long long int convertme;
|
|
|
|
if (bracket || words[1 + *offset] != ')')
|
|
{
|
|
free (expr);
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
++(*offset);
|
|
|
|
/* Go - evaluate. */
|
|
if (*expr && eval_expr (expr, &numresult) != 0)
|
|
{
|
|
free (expr);
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
if (numresult < 0)
|
|
{
|
|
convertme = -numresult;
|
|
*word = w_addchar (*word, word_length, max_length, '-');
|
|
if (!*word)
|
|
{
|
|
free (expr);
|
|
return WRDE_NOSPACE;
|
|
}
|
|
}
|
|
else
|
|
convertme = numresult;
|
|
|
|
result[20] = '\0';
|
|
*word = w_addstr (*word, word_length, max_length,
|
|
_itoa (convertme, &result[20], 10, 0));
|
|
free (expr);
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
|
|
if (expr == NULL)
|
|
return WRDE_NOSPACE;
|
|
|
|
break;
|
|
|
|
case ']':
|
|
if (bracket && paren_depth == 1)
|
|
{
|
|
char result[21]; /* 21 = ceil(log10(2^64)) + 1 */
|
|
long int numresult = 0;
|
|
|
|
/* Go - evaluate. */
|
|
if (*expr && eval_expr (expr, &numresult) != 0)
|
|
{
|
|
free (expr);
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
result[20] = '\0';
|
|
*word = w_addstr (*word, word_length, max_length,
|
|
_itoa_word (numresult, &result[20], 10, 0));
|
|
free (expr);
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
|
|
free (expr);
|
|
return WRDE_SYNTAX;
|
|
|
|
case '\n':
|
|
case ';':
|
|
case '{':
|
|
case '}':
|
|
free (expr);
|
|
return WRDE_BADCHAR;
|
|
|
|
case '(':
|
|
++paren_depth;
|
|
/* Fall through. */
|
|
default:
|
|
expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
|
|
if (expr == NULL)
|
|
return WRDE_NOSPACE;
|
|
}
|
|
}
|
|
|
|
/* Premature end */
|
|
free (expr);
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
#define DYNARRAY_STRUCT strlist
|
|
#define DYNARRAY_ELEMENT char *
|
|
#define DYNARRAY_PREFIX strlist_
|
|
/* Allocates about 512/1024 (32/64 bit) on stack. */
|
|
#define DYNARRAY_INITIAL_SIZE 128
|
|
#include <malloc/dynarray-skeleton.c>
|
|
|
|
/* Function called by child process in exec_comm() */
|
|
static pid_t
|
|
exec_comm_child (char *comm, int *fildes, bool showerr, bool noexec)
|
|
{
|
|
pid_t pid = -1;
|
|
|
|
/* Execute the command, or just check syntax? */
|
|
const char *args[] = { _PATH_BSHELL, noexec ? "-nc" : "-c", comm, NULL };
|
|
|
|
posix_spawn_file_actions_t fa;
|
|
/* posix_spawn_file_actions_init does not fail. */
|
|
__posix_spawn_file_actions_init (&fa);
|
|
|
|
/* Redirect output. For check syntax only (noexec being true), exec_comm
|
|
explicits sets fildes[1] to -1, so check its value to avoid a failure in
|
|
__posix_spawn_file_actions_adddup2. */
|
|
if (fildes[1] != -1)
|
|
{
|
|
if (__glibc_likely (fildes[1] != STDOUT_FILENO))
|
|
{
|
|
if (__posix_spawn_file_actions_adddup2 (&fa, fildes[1],
|
|
STDOUT_FILENO) != 0
|
|
|| __posix_spawn_file_actions_addclose (&fa, fildes[1]) != 0)
|
|
goto out;
|
|
}
|
|
else
|
|
/* Reset the close-on-exec flag (if necessary). */
|
|
if (__posix_spawn_file_actions_adddup2 (&fa, fildes[1], fildes[1])
|
|
!= 0)
|
|
goto out;
|
|
}
|
|
|
|
/* Redirect stderr to /dev/null if we have to. */
|
|
if (!showerr)
|
|
if (__posix_spawn_file_actions_addopen (&fa, STDERR_FILENO, _PATH_DEVNULL,
|
|
O_WRONLY, 0) != 0)
|
|
goto out;
|
|
|
|
struct strlist newenv;
|
|
strlist_init (&newenv);
|
|
|
|
bool recreate_env = getenv ("IFS") != NULL;
|
|
if (recreate_env)
|
|
{
|
|
for (char **ep = __environ; *ep != NULL; ep++)
|
|
if (strncmp (*ep, "IFS=", strlen ("IFS=")) != 0)
|
|
strlist_add (&newenv, *ep);
|
|
strlist_add (&newenv, NULL);
|
|
if (strlist_has_failed (&newenv))
|
|
goto out;
|
|
}
|
|
|
|
/* pid is not set if posix_spawn fails, so it keep the original value
|
|
of -1. */
|
|
__posix_spawn (&pid, _PATH_BSHELL, &fa, NULL, (char *const *) args,
|
|
recreate_env ? strlist_begin (&newenv) : __environ);
|
|
|
|
strlist_free (&newenv);
|
|
|
|
out:
|
|
__posix_spawn_file_actions_destroy (&fa);
|
|
|
|
return pid;
|
|
}
|
|
|
|
/* Function to execute a command and retrieve the results */
|
|
/* pwordexp contains NULL if field-splitting is forbidden */
|
|
static int
|
|
exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length,
|
|
int flags, wordexp_t *pwordexp, const char *ifs,
|
|
const char *ifs_white)
|
|
{
|
|
int fildes[2];
|
|
#define bufsize 128
|
|
int buflen;
|
|
int i;
|
|
int status = 0;
|
|
size_t maxnewlines = 0;
|
|
char buffer[bufsize];
|
|
pid_t pid;
|
|
bool noexec = false;
|
|
|
|
/* Do nothing if command substitution should not succeed. */
|
|
if (flags & WRDE_NOCMD)
|
|
return WRDE_CMDSUB;
|
|
|
|
/* Don't posix_spawn unless necessary */
|
|
if (!comm || !*comm)
|
|
return 0;
|
|
|
|
if (__pipe2 (fildes, O_CLOEXEC) < 0)
|
|
return WRDE_NOSPACE;
|
|
|
|
again:
|
|
pid = exec_comm_child (comm, fildes, noexec ? false : flags & WRDE_SHOWERR,
|
|
noexec);
|
|
if (pid < 0)
|
|
{
|
|
__close (fildes[0]);
|
|
__close (fildes[1]);
|
|
return WRDE_NOSPACE;
|
|
}
|
|
|
|
/* If we are just testing the syntax, only wait. */
|
|
if (noexec)
|
|
return (TEMP_FAILURE_RETRY (__waitpid (pid, &status, 0)) == pid
|
|
&& status != 0) ? WRDE_SYNTAX : 0;
|
|
|
|
__close (fildes[1]);
|
|
fildes[1] = -1;
|
|
|
|
if (!pwordexp)
|
|
/* Quoted - no field splitting */
|
|
{
|
|
while (1)
|
|
{
|
|
if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
|
|
bufsize))) < 1)
|
|
{
|
|
/* If read returned 0 then the process has closed its
|
|
stdout. Don't use WNOHANG in that case to avoid busy
|
|
looping until the process eventually exits. */
|
|
if (TEMP_FAILURE_RETRY (__waitpid (pid, &status,
|
|
buflen == 0 ? 0 : WNOHANG))
|
|
== 0)
|
|
continue;
|
|
if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
|
|
bufsize))) < 1)
|
|
break;
|
|
}
|
|
|
|
maxnewlines += buflen;
|
|
|
|
*word = w_addmem (*word, word_length, max_length, buffer, buflen);
|
|
if (*word == NULL)
|
|
goto no_space;
|
|
}
|
|
}
|
|
else
|
|
/* Not quoted - split fields */
|
|
{
|
|
int copying = 0;
|
|
/* 'copying' is:
|
|
* 0 when searching for first character in a field not IFS white space
|
|
* 1 when copying the text of a field
|
|
* 2 when searching for possible non-whitespace IFS
|
|
* 3 when searching for non-newline after copying field
|
|
*/
|
|
|
|
while (1)
|
|
{
|
|
if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
|
|
bufsize))) < 1)
|
|
{
|
|
/* If read returned 0 then the process has closed its
|
|
stdout. Don't use WNOHANG in that case to avoid busy
|
|
looping until the process eventually exits. */
|
|
if (TEMP_FAILURE_RETRY (__waitpid (pid, &status,
|
|
buflen == 0 ? 0 : WNOHANG))
|
|
== 0)
|
|
continue;
|
|
if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer,
|
|
bufsize))) < 1)
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < buflen; ++i)
|
|
{
|
|
if (strchr (ifs, buffer[i]) != NULL)
|
|
{
|
|
/* Current character is IFS */
|
|
if (strchr (ifs_white, buffer[i]) == NULL)
|
|
{
|
|
/* Current character is IFS but not whitespace */
|
|
if (copying == 2)
|
|
{
|
|
/* current character
|
|
* |
|
|
* V
|
|
* eg: text<space><comma><space>moretext
|
|
*
|
|
* So, strip whitespace IFS (like at the start)
|
|
*/
|
|
copying = 0;
|
|
continue;
|
|
}
|
|
|
|
copying = 0;
|
|
/* fall through and delimit field.. */
|
|
}
|
|
else
|
|
{
|
|
if (buffer[i] == '\n')
|
|
{
|
|
/* Current character is (IFS) newline */
|
|
|
|
/* If copying a field, this is the end of it,
|
|
but maybe all that's left is trailing newlines.
|
|
So start searching for a non-newline. */
|
|
if (copying == 1)
|
|
copying = 3;
|
|
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
/* Current character is IFS white space, but
|
|
not a newline */
|
|
|
|
/* If not either copying a field or searching
|
|
for non-newline after a field, ignore it */
|
|
if (copying != 1 && copying != 3)
|
|
continue;
|
|
|
|
/* End of field (search for non-ws IFS afterwards) */
|
|
copying = 2;
|
|
}
|
|
}
|
|
|
|
/* First IFS white space (non-newline), or IFS non-whitespace.
|
|
* Delimit the field. Nulls are converted by w_addword. */
|
|
if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
|
|
goto no_space;
|
|
|
|
*word = w_newword (word_length, max_length);
|
|
|
|
maxnewlines = 0;
|
|
/* fall back round the loop.. */
|
|
}
|
|
else
|
|
{
|
|
/* Not IFS character */
|
|
|
|
if (copying == 3)
|
|
{
|
|
/* Nothing but (IFS) newlines since the last field,
|
|
so delimit it here before starting new word */
|
|
if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
|
|
goto no_space;
|
|
|
|
*word = w_newword (word_length, max_length);
|
|
}
|
|
|
|
copying = 1;
|
|
|
|
if (buffer[i] == '\n') /* happens if newline not in IFS */
|
|
maxnewlines++;
|
|
else
|
|
maxnewlines = 0;
|
|
|
|
*word = w_addchar (*word, word_length, max_length,
|
|
buffer[i]);
|
|
if (*word == NULL)
|
|
goto no_space;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Chop off trailing newlines (required by POSIX.2) */
|
|
/* Ensure we don't go back further than the beginning of the
|
|
substitution (i.e. remove maxnewlines bytes at most) */
|
|
while (maxnewlines-- != 0
|
|
&& *word_length > 0 && (*word)[*word_length - 1] == '\n')
|
|
{
|
|
(*word)[--*word_length] = '\0';
|
|
|
|
/* If the last word was entirely newlines, turn it into a new word
|
|
* which can be ignored if there's nothing following it. */
|
|
if (*word_length == 0)
|
|
{
|
|
free (*word);
|
|
*word = w_newword (word_length, max_length);
|
|
break;
|
|
}
|
|
}
|
|
|
|
__close (fildes[0]);
|
|
fildes[0] = -1;
|
|
|
|
/* Check for syntax error (re-execute but with "-n" flag) */
|
|
if (buflen < 1 && status != 0)
|
|
{
|
|
noexec = true;
|
|
goto again;
|
|
}
|
|
|
|
return 0;
|
|
|
|
no_space:
|
|
__kill (pid, SIGKILL);
|
|
TEMP_FAILURE_RETRY (__waitpid (pid, NULL, 0));
|
|
__close (fildes[0]);
|
|
return WRDE_NOSPACE;
|
|
}
|
|
|
|
static int
|
|
parse_comm (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags, wordexp_t *pwordexp,
|
|
const char *ifs, const char *ifs_white)
|
|
{
|
|
/* We are poised just after "$(" */
|
|
int paren_depth = 1;
|
|
int error = 0;
|
|
int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
|
|
size_t comm_length;
|
|
size_t comm_maxlen;
|
|
char *comm = w_newword (&comm_length, &comm_maxlen);
|
|
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
switch (words[*offset])
|
|
{
|
|
case '\'':
|
|
if (quoted == 0)
|
|
quoted = 1;
|
|
else if (quoted == 1)
|
|
quoted = 0;
|
|
|
|
break;
|
|
|
|
case '"':
|
|
if (quoted == 0)
|
|
quoted = 2;
|
|
else if (quoted == 2)
|
|
quoted = 0;
|
|
|
|
break;
|
|
|
|
case ')':
|
|
if (!quoted && --paren_depth == 0)
|
|
{
|
|
/* Go -- give script to the shell */
|
|
if (comm)
|
|
{
|
|
/* posix_spawn already handles thread cancellation. */
|
|
error = exec_comm (comm, word, word_length, max_length,
|
|
flags, pwordexp, ifs, ifs_white);
|
|
free (comm);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/* This is just part of the script */
|
|
break;
|
|
|
|
case '(':
|
|
if (!quoted)
|
|
++paren_depth;
|
|
}
|
|
|
|
comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
|
|
if (comm == NULL)
|
|
return WRDE_NOSPACE;
|
|
}
|
|
|
|
/* Premature end. */
|
|
free (comm);
|
|
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
#define CHAR_IN_SET(ch, char_set) \
|
|
(memchr (char_set "", ch, sizeof (char_set) - 1) != NULL)
|
|
|
|
static int
|
|
parse_param (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags, wordexp_t *pwordexp,
|
|
const char *ifs, const char *ifs_white, int quoted)
|
|
{
|
|
/* We are poised just after "$" */
|
|
enum action
|
|
{
|
|
ACT_NONE,
|
|
ACT_RP_SHORT_LEFT = '#',
|
|
ACT_RP_LONG_LEFT = 'L',
|
|
ACT_RP_SHORT_RIGHT = '%',
|
|
ACT_RP_LONG_RIGHT = 'R',
|
|
ACT_NULL_ERROR = '?',
|
|
ACT_NULL_SUBST = '-',
|
|
ACT_NONNULL_SUBST = '+',
|
|
ACT_NULL_ASSIGN = '='
|
|
};
|
|
size_t env_length;
|
|
size_t env_maxlen;
|
|
size_t pat_length;
|
|
size_t pat_maxlen;
|
|
size_t start = *offset;
|
|
char *env;
|
|
char *pattern;
|
|
char *value = NULL;
|
|
enum action action = ACT_NONE;
|
|
int depth = 0;
|
|
int colon_seen = 0;
|
|
int seen_hash = 0;
|
|
int free_value = 0;
|
|
int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */
|
|
int error;
|
|
int special = 0;
|
|
char buffer[21];
|
|
int brace = words[*offset] == '{';
|
|
|
|
env = w_newword (&env_length, &env_maxlen);
|
|
pattern = w_newword (&pat_length, &pat_maxlen);
|
|
|
|
if (brace)
|
|
++*offset;
|
|
|
|
/* First collect the parameter name. */
|
|
|
|
if (words[*offset] == '#')
|
|
{
|
|
seen_hash = 1;
|
|
if (!brace)
|
|
goto envsubst;
|
|
++*offset;
|
|
}
|
|
|
|
if (isalpha (words[*offset]) || words[*offset] == '_')
|
|
{
|
|
/* Normal parameter name. */
|
|
do
|
|
{
|
|
env = w_addchar (env, &env_length, &env_maxlen,
|
|
words[*offset]);
|
|
if (env == NULL)
|
|
goto no_space;
|
|
}
|
|
while (isalnum (words[++*offset]) || words[*offset] == '_');
|
|
}
|
|
else if (isdigit (words[*offset]))
|
|
{
|
|
/* Numeric parameter name. */
|
|
special = 1;
|
|
do
|
|
{
|
|
env = w_addchar (env, &env_length, &env_maxlen,
|
|
words[*offset]);
|
|
if (env == NULL)
|
|
goto no_space;
|
|
if (!brace)
|
|
goto envsubst;
|
|
}
|
|
while (isdigit(words[++*offset]));
|
|
}
|
|
else if (CHAR_IN_SET (words[*offset], "*@$"))
|
|
{
|
|
/* Special parameter. */
|
|
special = 1;
|
|
env = w_addchar (env, &env_length, &env_maxlen,
|
|
words[*offset]);
|
|
if (env == NULL)
|
|
goto no_space;
|
|
++*offset;
|
|
}
|
|
else
|
|
{
|
|
if (brace)
|
|
goto syntax;
|
|
}
|
|
|
|
if (brace)
|
|
{
|
|
/* Check for special action to be applied to the value. */
|
|
switch (words[*offset])
|
|
{
|
|
case '}':
|
|
/* Evaluate. */
|
|
goto envsubst;
|
|
|
|
case '#':
|
|
action = ACT_RP_SHORT_LEFT;
|
|
if (words[1 + *offset] == '#')
|
|
{
|
|
++*offset;
|
|
action = ACT_RP_LONG_LEFT;
|
|
}
|
|
break;
|
|
|
|
case '%':
|
|
action = ACT_RP_SHORT_RIGHT;
|
|
if (words[1 + *offset] == '%')
|
|
{
|
|
++*offset;
|
|
action = ACT_RP_LONG_RIGHT;
|
|
}
|
|
break;
|
|
|
|
case ':':
|
|
if (!CHAR_IN_SET (words[1 + *offset], "-=?+"))
|
|
goto syntax;
|
|
|
|
colon_seen = 1;
|
|
action = words[++*offset];
|
|
break;
|
|
|
|
case '-':
|
|
case '=':
|
|
case '?':
|
|
case '+':
|
|
action = words[*offset];
|
|
break;
|
|
|
|
default:
|
|
goto syntax;
|
|
}
|
|
|
|
/* Now collect the pattern, but don't expand it yet. */
|
|
++*offset;
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
switch (words[*offset])
|
|
{
|
|
case '{':
|
|
if (!pattern_is_quoted)
|
|
++depth;
|
|
break;
|
|
|
|
case '}':
|
|
if (!pattern_is_quoted)
|
|
{
|
|
if (depth == 0)
|
|
goto envsubst;
|
|
--depth;
|
|
}
|
|
break;
|
|
|
|
case '\\':
|
|
if (pattern_is_quoted)
|
|
/* Quoted; treat as normal character. */
|
|
break;
|
|
|
|
/* Otherwise, it's an escape: next character is literal. */
|
|
if (words[++*offset] == '\0')
|
|
goto syntax;
|
|
|
|
pattern = w_addchar (pattern, &pat_length, &pat_maxlen, '\\');
|
|
if (pattern == NULL)
|
|
goto no_space;
|
|
|
|
break;
|
|
|
|
case '\'':
|
|
if (pattern_is_quoted == 0)
|
|
pattern_is_quoted = 1;
|
|
else if (pattern_is_quoted == 1)
|
|
pattern_is_quoted = 0;
|
|
|
|
break;
|
|
|
|
case '"':
|
|
if (pattern_is_quoted == 0)
|
|
pattern_is_quoted = 2;
|
|
else if (pattern_is_quoted == 2)
|
|
pattern_is_quoted = 0;
|
|
|
|
break;
|
|
}
|
|
|
|
pattern = w_addchar (pattern, &pat_length, &pat_maxlen,
|
|
words[*offset]);
|
|
if (pattern == NULL)
|
|
goto no_space;
|
|
}
|
|
}
|
|
|
|
/* End of input string -- remember to reparse the character that we
|
|
* stopped at. */
|
|
--(*offset);
|
|
|
|
envsubst:
|
|
if (words[start] == '{' && words[*offset] != '}')
|
|
goto syntax;
|
|
|
|
if (env == NULL)
|
|
{
|
|
if (seen_hash)
|
|
{
|
|
/* $# expands to the number of positional parameters */
|
|
buffer[20] = '\0';
|
|
value = _itoa_word (__libc_argc - 1, &buffer[20], 10, 0);
|
|
seen_hash = 0;
|
|
}
|
|
else
|
|
{
|
|
/* Just $ on its own */
|
|
*offset = start - 1;
|
|
*word = w_addchar (*word, word_length, max_length, '$');
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
}
|
|
/* Is it a numeric parameter? */
|
|
else if (isdigit (env[0]))
|
|
{
|
|
int n = atoi (env);
|
|
|
|
if (n >= __libc_argc)
|
|
/* Substitute NULL. */
|
|
value = NULL;
|
|
else
|
|
/* Replace with appropriate positional parameter. */
|
|
value = __libc_argv[n];
|
|
}
|
|
/* Is it a special parameter? */
|
|
else if (special)
|
|
{
|
|
/* Is it `$$'? */
|
|
if (*env == '$')
|
|
{
|
|
buffer[20] = '\0';
|
|
value = _itoa_word (__getpid (), &buffer[20], 10, 0);
|
|
}
|
|
/* Is it `${#*}' or `${#@}'? */
|
|
else if ((*env == '*' || *env == '@') && seen_hash)
|
|
{
|
|
buffer[20] = '\0';
|
|
value = _itoa_word (__libc_argc > 0 ? __libc_argc - 1 : 0,
|
|
&buffer[20], 10, 0);
|
|
*word = w_addstr (*word, word_length, max_length, value);
|
|
free (env);
|
|
free (pattern);
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
/* Is it `$*' or `$@' (unquoted) ? */
|
|
else if (*env == '*' || (*env == '@' && !quoted))
|
|
{
|
|
size_t plist_len = 0;
|
|
int p;
|
|
char *end;
|
|
|
|
/* Build up value parameter by parameter (copy them) */
|
|
for (p = 1; __libc_argv[p]; ++p)
|
|
plist_len += strlen (__libc_argv[p]) + 1; /* for space */
|
|
value = malloc (plist_len);
|
|
if (value == NULL)
|
|
goto no_space;
|
|
end = value;
|
|
*end = 0;
|
|
for (p = 1; __libc_argv[p]; ++p)
|
|
{
|
|
if (p > 1)
|
|
*end++ = ' ';
|
|
end = __stpcpy (end, __libc_argv[p]);
|
|
}
|
|
|
|
free_value = 1;
|
|
}
|
|
else
|
|
{
|
|
/* Must be a quoted `$@' */
|
|
assert (*env == '@' && quoted);
|
|
|
|
/* Each parameter is a separate word ("$@") */
|
|
if (__libc_argc == 2)
|
|
value = __libc_argv[1];
|
|
else if (__libc_argc > 2)
|
|
{
|
|
int p;
|
|
|
|
/* Append first parameter to current word. */
|
|
value = w_addstr (*word, word_length, max_length,
|
|
__libc_argv[1]);
|
|
if (value == NULL || w_addword (pwordexp, value))
|
|
goto no_space;
|
|
|
|
for (p = 2; __libc_argv[p + 1]; p++)
|
|
{
|
|
char *newword = __strdup (__libc_argv[p]);
|
|
if (newword == NULL || w_addword (pwordexp, newword))
|
|
goto no_space;
|
|
}
|
|
|
|
/* Start a new word with the last parameter. */
|
|
*word = w_newword (word_length, max_length);
|
|
value = __libc_argv[p];
|
|
}
|
|
else
|
|
{
|
|
free (env);
|
|
free (pattern);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
value = getenv (env);
|
|
|
|
if (value == NULL && (flags & WRDE_UNDEF))
|
|
{
|
|
/* Variable not defined. */
|
|
error = WRDE_BADVAL;
|
|
goto do_error;
|
|
}
|
|
|
|
if (action != ACT_NONE)
|
|
{
|
|
int expand_pattern = 0;
|
|
|
|
/* First, find out if we need to expand pattern (i.e. if we will
|
|
* use it). */
|
|
switch (action)
|
|
{
|
|
case ACT_RP_SHORT_LEFT:
|
|
case ACT_RP_LONG_LEFT:
|
|
case ACT_RP_SHORT_RIGHT:
|
|
case ACT_RP_LONG_RIGHT:
|
|
/* Always expand for these. */
|
|
expand_pattern = 1;
|
|
break;
|
|
|
|
case ACT_NULL_ERROR:
|
|
case ACT_NULL_SUBST:
|
|
case ACT_NULL_ASSIGN:
|
|
if (!value || (!*value && colon_seen))
|
|
/* If param is unset, or set but null and a colon has been seen,
|
|
the expansion of the pattern will be needed. */
|
|
expand_pattern = 1;
|
|
|
|
break;
|
|
|
|
case ACT_NONNULL_SUBST:
|
|
/* Expansion of word will be needed if parameter is set and not null,
|
|
or set null but no colon has been seen. */
|
|
if (value && (*value || !colon_seen))
|
|
expand_pattern = 1;
|
|
|
|
break;
|
|
|
|
default:
|
|
assert (! "Unrecognised action!");
|
|
}
|
|
|
|
if (expand_pattern)
|
|
{
|
|
/* We need to perform tilde expansion, parameter expansion,
|
|
command substitution, and arithmetic expansion. We also
|
|
have to be a bit careful with wildcard characters, as
|
|
pattern might be given to fnmatch soon. To do this, we
|
|
convert quotes to escapes. */
|
|
|
|
char *expanded;
|
|
size_t exp_len;
|
|
size_t exp_maxl;
|
|
char *p;
|
|
int quoted = 0; /* 1: single quotes; 2: double */
|
|
|
|
expanded = w_newword (&exp_len, &exp_maxl);
|
|
for (p = pattern; p && *p; p++)
|
|
{
|
|
size_t offset;
|
|
|
|
switch (*p)
|
|
{
|
|
case '"':
|
|
if (quoted == 2)
|
|
quoted = 0;
|
|
else if (quoted == 0)
|
|
quoted = 2;
|
|
else break;
|
|
|
|
continue;
|
|
|
|
case '\'':
|
|
if (quoted == 1)
|
|
quoted = 0;
|
|
else if (quoted == 0)
|
|
quoted = 1;
|
|
else break;
|
|
|
|
continue;
|
|
|
|
case '*':
|
|
case '?':
|
|
if (quoted)
|
|
{
|
|
/* Convert quoted wildchar to escaped wildchar. */
|
|
expanded = w_addchar (expanded, &exp_len,
|
|
&exp_maxl, '\\');
|
|
|
|
if (expanded == NULL)
|
|
goto no_space;
|
|
}
|
|
break;
|
|
|
|
case '$':
|
|
offset = 0;
|
|
error = parse_dollars (&expanded, &exp_len, &exp_maxl, p,
|
|
&offset, flags, NULL, NULL, NULL, 1);
|
|
if (error)
|
|
{
|
|
if (free_value)
|
|
free (value);
|
|
|
|
free (expanded);
|
|
|
|
goto do_error;
|
|
}
|
|
|
|
p += offset;
|
|
continue;
|
|
|
|
case '~':
|
|
if (quoted || exp_len)
|
|
break;
|
|
|
|
offset = 0;
|
|
error = parse_tilde (&expanded, &exp_len, &exp_maxl, p,
|
|
&offset, 0);
|
|
if (error)
|
|
{
|
|
if (free_value)
|
|
free (value);
|
|
|
|
free (expanded);
|
|
|
|
goto do_error;
|
|
}
|
|
|
|
p += offset;
|
|
continue;
|
|
|
|
case '\\':
|
|
expanded = w_addchar (expanded, &exp_len, &exp_maxl, '\\');
|
|
++p;
|
|
assert (*p); /* checked when extracted initially */
|
|
if (expanded == NULL)
|
|
goto no_space;
|
|
}
|
|
|
|
expanded = w_addchar (expanded, &exp_len, &exp_maxl, *p);
|
|
|
|
if (expanded == NULL)
|
|
goto no_space;
|
|
}
|
|
|
|
free (pattern);
|
|
|
|
pattern = expanded;
|
|
}
|
|
|
|
switch (action)
|
|
{
|
|
case ACT_RP_SHORT_LEFT:
|
|
case ACT_RP_LONG_LEFT:
|
|
case ACT_RP_SHORT_RIGHT:
|
|
case ACT_RP_LONG_RIGHT:
|
|
{
|
|
char *p;
|
|
char c;
|
|
char *end;
|
|
|
|
if (value == NULL || pattern == NULL || *pattern == '\0')
|
|
break;
|
|
|
|
end = value + strlen (value);
|
|
|
|
switch (action)
|
|
{
|
|
case ACT_RP_SHORT_LEFT:
|
|
for (p = value; p <= end; ++p)
|
|
{
|
|
c = *p;
|
|
*p = '\0';
|
|
if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
|
|
{
|
|
*p = c;
|
|
if (free_value)
|
|
{
|
|
char *newval = __strdup (p);
|
|
if (newval == NULL)
|
|
{
|
|
free (value);
|
|
goto no_space;
|
|
}
|
|
free (value);
|
|
value = newval;
|
|
}
|
|
else
|
|
value = p;
|
|
break;
|
|
}
|
|
*p = c;
|
|
}
|
|
|
|
break;
|
|
|
|
case ACT_RP_LONG_LEFT:
|
|
for (p = end; p >= value; --p)
|
|
{
|
|
c = *p;
|
|
*p = '\0';
|
|
if (fnmatch (pattern, value, 0) != FNM_NOMATCH)
|
|
{
|
|
*p = c;
|
|
if (free_value)
|
|
{
|
|
char *newval = __strdup (p);
|
|
if (newval == NULL)
|
|
{
|
|
free (value);
|
|
goto no_space;
|
|
}
|
|
free (value);
|
|
value = newval;
|
|
}
|
|
else
|
|
value = p;
|
|
break;
|
|
}
|
|
*p = c;
|
|
}
|
|
|
|
break;
|
|
|
|
case ACT_RP_SHORT_RIGHT:
|
|
for (p = end; p >= value; --p)
|
|
{
|
|
if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
|
|
{
|
|
char *newval;
|
|
newval = malloc (p - value + 1);
|
|
|
|
if (newval == NULL)
|
|
{
|
|
if (free_value)
|
|
free (value);
|
|
goto no_space;
|
|
}
|
|
|
|
*(char *) __mempcpy (newval, value, p - value) = '\0';
|
|
if (free_value)
|
|
free (value);
|
|
value = newval;
|
|
free_value = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
case ACT_RP_LONG_RIGHT:
|
|
for (p = value; p <= end; ++p)
|
|
{
|
|
if (fnmatch (pattern, p, 0) != FNM_NOMATCH)
|
|
{
|
|
char *newval;
|
|
newval = malloc (p - value + 1);
|
|
|
|
if (newval == NULL)
|
|
{
|
|
if (free_value)
|
|
free (value);
|
|
goto no_space;
|
|
}
|
|
|
|
*(char *) __mempcpy (newval, value, p - value) = '\0';
|
|
if (free_value)
|
|
free (value);
|
|
value = newval;
|
|
free_value = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case ACT_NULL_ERROR:
|
|
if (value && *value)
|
|
/* Substitute parameter */
|
|
break;
|
|
|
|
error = 0;
|
|
if (!colon_seen && value)
|
|
/* Substitute NULL */
|
|
;
|
|
else
|
|
{
|
|
const char *str = pattern;
|
|
|
|
if (str[0] == '\0')
|
|
str = _("parameter null or not set");
|
|
|
|
__fxprintf (NULL, "%s: %s\n", env, str);
|
|
}
|
|
|
|
if (free_value)
|
|
free (value);
|
|
goto do_error;
|
|
|
|
case ACT_NULL_SUBST:
|
|
if (value && *value)
|
|
/* Substitute parameter */
|
|
break;
|
|
|
|
if (free_value)
|
|
free (value);
|
|
|
|
if (!colon_seen && value)
|
|
/* Substitute NULL */
|
|
goto success;
|
|
|
|
value = pattern ? __strdup (pattern) : pattern;
|
|
free_value = 1;
|
|
|
|
if (pattern && !value)
|
|
goto no_space;
|
|
|
|
break;
|
|
|
|
case ACT_NONNULL_SUBST:
|
|
if (value && (*value || !colon_seen))
|
|
{
|
|
if (free_value)
|
|
free (value);
|
|
|
|
value = pattern ? __strdup (pattern) : pattern;
|
|
free_value = 1;
|
|
|
|
if (pattern && !value)
|
|
goto no_space;
|
|
|
|
break;
|
|
}
|
|
|
|
/* Substitute NULL */
|
|
if (free_value)
|
|
free (value);
|
|
goto success;
|
|
|
|
case ACT_NULL_ASSIGN:
|
|
if (value && *value)
|
|
/* Substitute parameter */
|
|
break;
|
|
|
|
if (!colon_seen && value)
|
|
{
|
|
/* Substitute NULL */
|
|
if (free_value)
|
|
free (value);
|
|
goto success;
|
|
}
|
|
|
|
if (free_value)
|
|
free (value);
|
|
|
|
value = pattern ? __strdup (pattern) : pattern;
|
|
free_value = 1;
|
|
|
|
if (pattern && !value)
|
|
goto no_space;
|
|
|
|
__setenv (env, value ?: "", 1);
|
|
break;
|
|
|
|
default:
|
|
assert (! "Unrecognised action!");
|
|
}
|
|
}
|
|
|
|
free (env);
|
|
env = NULL;
|
|
free (pattern);
|
|
pattern = NULL;
|
|
|
|
if (seen_hash)
|
|
{
|
|
char param_length[21];
|
|
param_length[20] = '\0';
|
|
*word = w_addstr (*word, word_length, max_length,
|
|
_itoa_word (value ? strlen (value) : 0,
|
|
¶m_length[20], 10, 0));
|
|
if (free_value)
|
|
{
|
|
assert (value != NULL);
|
|
free (value);
|
|
}
|
|
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
|
|
if (value == NULL)
|
|
return 0;
|
|
|
|
if (quoted || !pwordexp)
|
|
{
|
|
/* Quoted - no field split */
|
|
*word = w_addstr (*word, word_length, max_length, value);
|
|
if (free_value)
|
|
free (value);
|
|
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
}
|
|
else
|
|
{
|
|
/* Need to field-split */
|
|
char *value_copy = __strdup (value); /* Don't modify value */
|
|
char *field_begin = value_copy;
|
|
int seen_nonws_ifs = 0;
|
|
|
|
if (free_value)
|
|
free (value);
|
|
|
|
if (value_copy == NULL)
|
|
goto no_space;
|
|
|
|
do
|
|
{
|
|
char *field_end = field_begin;
|
|
char *next_field;
|
|
|
|
/* If this isn't the first field, start a new word */
|
|
if (field_begin != value_copy)
|
|
{
|
|
if (w_addword (pwordexp, *word) == WRDE_NOSPACE)
|
|
{
|
|
free (value_copy);
|
|
goto no_space;
|
|
}
|
|
|
|
*word = w_newword (word_length, max_length);
|
|
}
|
|
|
|
/* Skip IFS whitespace before the field */
|
|
field_begin += strspn (field_begin, ifs_white);
|
|
|
|
if (!seen_nonws_ifs && *field_begin == 0)
|
|
/* Nothing but whitespace */
|
|
break;
|
|
|
|
/* Search for the end of the field */
|
|
field_end = field_begin + strcspn (field_begin, ifs);
|
|
|
|
/* Set up pointer to the character after end of field and
|
|
skip whitespace IFS after it. */
|
|
next_field = field_end + strspn (field_end, ifs_white);
|
|
|
|
/* Skip at most one non-whitespace IFS character after the field */
|
|
seen_nonws_ifs = 0;
|
|
if (*next_field && strchr (ifs, *next_field))
|
|
{
|
|
seen_nonws_ifs = 1;
|
|
next_field++;
|
|
}
|
|
|
|
/* Null-terminate it */
|
|
*field_end = 0;
|
|
|
|
/* Tag a copy onto the current word */
|
|
*word = w_addstr (*word, word_length, max_length, field_begin);
|
|
|
|
if (*word == NULL && *field_begin != '\0')
|
|
{
|
|
free (value_copy);
|
|
goto no_space;
|
|
}
|
|
|
|
field_begin = next_field;
|
|
}
|
|
while (seen_nonws_ifs || *field_begin);
|
|
|
|
free (value_copy);
|
|
}
|
|
|
|
return 0;
|
|
|
|
success:
|
|
error = 0;
|
|
goto do_error;
|
|
|
|
no_space:
|
|
error = WRDE_NOSPACE;
|
|
goto do_error;
|
|
|
|
syntax:
|
|
error = WRDE_SYNTAX;
|
|
|
|
do_error:
|
|
free (env);
|
|
|
|
free (pattern);
|
|
|
|
return error;
|
|
}
|
|
|
|
#undef CHAR_IN_SET
|
|
|
|
static int
|
|
parse_dollars (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags,
|
|
wordexp_t *pwordexp, const char *ifs, const char *ifs_white,
|
|
int quoted)
|
|
{
|
|
/* We are poised _at_ "$" */
|
|
switch (words[1 + *offset])
|
|
{
|
|
case '"':
|
|
case '\'':
|
|
case 0:
|
|
*word = w_addchar (*word, word_length, max_length, '$');
|
|
return *word ? 0 : WRDE_NOSPACE;
|
|
|
|
case '(':
|
|
if (words[2 + *offset] == '(')
|
|
{
|
|
/* Differentiate between $((1+3)) and $((echo);(ls)) */
|
|
int i = 3 + *offset;
|
|
int depth = 0;
|
|
while (words[i] && !(depth == 0 && words[i] == ')'))
|
|
{
|
|
if (words[i] == '(')
|
|
++depth;
|
|
else if (words[i] == ')')
|
|
--depth;
|
|
|
|
++i;
|
|
}
|
|
|
|
if (words[i] == ')' && words[i + 1] == ')')
|
|
{
|
|
(*offset) += 3;
|
|
/* Call parse_arith -- 0 is for "no brackets" */
|
|
return parse_arith (word, word_length, max_length, words, offset,
|
|
flags, 0);
|
|
}
|
|
}
|
|
|
|
(*offset) += 2;
|
|
return parse_comm (word, word_length, max_length, words, offset, flags,
|
|
quoted? NULL : pwordexp, ifs, ifs_white);
|
|
|
|
case '[':
|
|
(*offset) += 2;
|
|
/* Call parse_arith -- 1 is for "brackets" */
|
|
return parse_arith (word, word_length, max_length, words, offset, flags,
|
|
1);
|
|
|
|
case '{':
|
|
default:
|
|
++(*offset); /* parse_param needs to know if "{" is there */
|
|
return parse_param (word, word_length, max_length, words, offset, flags,
|
|
pwordexp, ifs, ifs_white, quoted);
|
|
}
|
|
}
|
|
|
|
static int
|
|
parse_backtick (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags,
|
|
wordexp_t *pwordexp, const char *ifs, const char *ifs_white)
|
|
{
|
|
/* We are poised just after "`" */
|
|
int error;
|
|
int squoting = 0;
|
|
size_t comm_length;
|
|
size_t comm_maxlen;
|
|
char *comm = w_newword (&comm_length, &comm_maxlen);
|
|
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
switch (words[*offset])
|
|
{
|
|
case '`':
|
|
/* Go -- give the script to the shell */
|
|
error = exec_comm (comm, word, word_length, max_length, flags,
|
|
pwordexp, ifs, ifs_white);
|
|
free (comm);
|
|
return error;
|
|
|
|
case '\\':
|
|
if (squoting)
|
|
{
|
|
error = parse_qtd_backslash (&comm, &comm_length, &comm_maxlen,
|
|
words, offset);
|
|
|
|
if (error)
|
|
{
|
|
free (comm);
|
|
return error;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
error = parse_backslash (&comm, &comm_length, &comm_maxlen, words,
|
|
offset);
|
|
|
|
if (error)
|
|
{
|
|
free (comm);
|
|
return error;
|
|
}
|
|
|
|
break;
|
|
|
|
case '\'':
|
|
squoting = 1 - squoting;
|
|
/* Fall through. */
|
|
default:
|
|
comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
|
|
if (comm == NULL)
|
|
return WRDE_NOSPACE;
|
|
}
|
|
}
|
|
|
|
/* Premature end */
|
|
free (comm);
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
static int
|
|
parse_dquote (char **word, size_t *word_length, size_t *max_length,
|
|
const char *words, size_t *offset, int flags,
|
|
wordexp_t *pwordexp, const char * ifs, const char * ifs_white)
|
|
{
|
|
/* We are poised just after a double-quote */
|
|
int error;
|
|
|
|
for (; words[*offset]; ++(*offset))
|
|
{
|
|
switch (words[*offset])
|
|
{
|
|
case '"':
|
|
return 0;
|
|
|
|
case '$':
|
|
error = parse_dollars (word, word_length, max_length, words, offset,
|
|
flags, pwordexp, ifs, ifs_white, 1);
|
|
/* The ``1'' here is to tell parse_dollars not to
|
|
* split the fields. It may need to, however ("$@").
|
|
*/
|
|
if (error)
|
|
return error;
|
|
|
|
break;
|
|
|
|
case '`':
|
|
++(*offset);
|
|
error = parse_backtick (word, word_length, max_length, words,
|
|
offset, flags, NULL, NULL, NULL);
|
|
/* The first NULL here is to tell parse_backtick not to
|
|
* split the fields.
|
|
*/
|
|
if (error)
|
|
return error;
|
|
|
|
break;
|
|
|
|
case '\\':
|
|
error = parse_qtd_backslash (word, word_length, max_length, words,
|
|
offset);
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
break;
|
|
|
|
default:
|
|
*word = w_addchar (*word, word_length, max_length, words[*offset]);
|
|
if (*word == NULL)
|
|
return WRDE_NOSPACE;
|
|
}
|
|
}
|
|
|
|
/* Unterminated string */
|
|
return WRDE_SYNTAX;
|
|
}
|
|
|
|
/*
|
|
* wordfree() is to be called after pwordexp is finished with.
|
|
*/
|
|
|
|
void
|
|
wordfree (wordexp_t *pwordexp)
|
|
{
|
|
|
|
/* wordexp can set pwordexp to NULL */
|
|
if (pwordexp && pwordexp->we_wordv)
|
|
{
|
|
char **wordv = pwordexp->we_wordv;
|
|
|
|
for (wordv += pwordexp->we_offs; *wordv; ++wordv)
|
|
free (*wordv);
|
|
|
|
free (pwordexp->we_wordv);
|
|
pwordexp->we_wordv = NULL;
|
|
}
|
|
}
|
|
libc_hidden_def (wordfree)
|
|
|
|
/*
|
|
* wordexp()
|
|
*/
|
|
|
|
int
|
|
wordexp (const char *words, wordexp_t *pwordexp, int flags)
|
|
{
|
|
size_t words_offset;
|
|
size_t word_length;
|
|
size_t max_length;
|
|
char *word = w_newword (&word_length, &max_length);
|
|
int error;
|
|
char *ifs;
|
|
char ifs_white[4];
|
|
wordexp_t old_word = *pwordexp;
|
|
|
|
if (flags & WRDE_REUSE)
|
|
{
|
|
/* Minimal implementation of WRDE_REUSE for now */
|
|
wordfree (pwordexp);
|
|
old_word.we_wordv = NULL;
|
|
}
|
|
|
|
if ((flags & WRDE_APPEND) == 0)
|
|
{
|
|
pwordexp->we_wordc = 0;
|
|
|
|
if (flags & WRDE_DOOFFS)
|
|
{
|
|
pwordexp->we_wordv = calloc (1 + pwordexp->we_offs, sizeof (char *));
|
|
if (pwordexp->we_wordv == NULL)
|
|
{
|
|
error = WRDE_NOSPACE;
|
|
goto do_error;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
pwordexp->we_wordv = calloc (1, sizeof (char *));
|
|
if (pwordexp->we_wordv == NULL)
|
|
{
|
|
error = WRDE_NOSPACE;
|
|
goto do_error;
|
|
}
|
|
|
|
pwordexp->we_offs = 0;
|
|
}
|
|
}
|
|
|
|
/* Find out what the field separators are.
|
|
* There are two types: whitespace and non-whitespace.
|
|
*/
|
|
ifs = getenv ("IFS");
|
|
|
|
if (ifs == NULL)
|
|
/* IFS unset - use <space><tab><newline>. */
|
|
ifs = strcpy (ifs_white, " \t\n");
|
|
else
|
|
{
|
|
char *ifsch = ifs;
|
|
char *whch = ifs_white;
|
|
|
|
while (*ifsch != '\0')
|
|
{
|
|
if (*ifsch == ' ' || *ifsch == '\t' || *ifsch == '\n')
|
|
{
|
|
/* Whitespace IFS. See first whether it is already in our
|
|
collection. */
|
|
char *runp = ifs_white;
|
|
|
|
while (runp < whch && *runp != *ifsch)
|
|
++runp;
|
|
|
|
if (runp == whch)
|
|
*whch++ = *ifsch;
|
|
}
|
|
|
|
++ifsch;
|
|
}
|
|
*whch = '\0';
|
|
}
|
|
|
|
for (words_offset = 0 ; words[words_offset] ; ++words_offset)
|
|
switch (words[words_offset])
|
|
{
|
|
case '\\':
|
|
error = parse_backslash (&word, &word_length, &max_length, words,
|
|
&words_offset);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
break;
|
|
|
|
case '$':
|
|
error = parse_dollars (&word, &word_length, &max_length, words,
|
|
&words_offset, flags, pwordexp, ifs, ifs_white,
|
|
0);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
break;
|
|
|
|
case '`':
|
|
++words_offset;
|
|
error = parse_backtick (&word, &word_length, &max_length, words,
|
|
&words_offset, flags, pwordexp, ifs,
|
|
ifs_white);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
break;
|
|
|
|
case '"':
|
|
++words_offset;
|
|
error = parse_dquote (&word, &word_length, &max_length, words,
|
|
&words_offset, flags, pwordexp, ifs, ifs_white);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
if (!word_length)
|
|
{
|
|
error = w_addword (pwordexp, NULL);
|
|
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
break;
|
|
|
|
case '\'':
|
|
++words_offset;
|
|
error = parse_squote (&word, &word_length, &max_length, words,
|
|
&words_offset);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
if (!word_length)
|
|
{
|
|
error = w_addword (pwordexp, NULL);
|
|
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
break;
|
|
|
|
case '~':
|
|
error = parse_tilde (&word, &word_length, &max_length, words,
|
|
&words_offset, pwordexp->we_wordc);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
break;
|
|
|
|
case '*':
|
|
case '[':
|
|
case '?':
|
|
error = parse_glob (&word, &word_length, &max_length, words,
|
|
&words_offset, flags, pwordexp, ifs, ifs_white);
|
|
|
|
if (error)
|
|
goto do_error;
|
|
|
|
break;
|
|
|
|
default:
|
|
/* Is it a word separator? */
|
|
if (strchr (" \t", words[words_offset]) == NULL)
|
|
{
|
|
char ch = words[words_offset];
|
|
|
|
/* Not a word separator -- but is it a valid word char? */
|
|
if (strchr ("\n|&;<>(){}", ch))
|
|
{
|
|
/* Fail */
|
|
error = WRDE_BADCHAR;
|
|
goto do_error;
|
|
}
|
|
|
|
/* "Ordinary" character -- add it to word */
|
|
word = w_addchar (word, &word_length, &max_length,
|
|
ch);
|
|
if (word == NULL)
|
|
{
|
|
error = WRDE_NOSPACE;
|
|
goto do_error;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* If a word has been delimited, add it to the list. */
|
|
if (word != NULL)
|
|
{
|
|
error = w_addword (pwordexp, word);
|
|
if (error)
|
|
goto do_error;
|
|
}
|
|
|
|
word = w_newword (&word_length, &max_length);
|
|
}
|
|
|
|
/* End of string */
|
|
|
|
/* There was a word separator at the end */
|
|
if (word == NULL) /* i.e. w_newword */
|
|
return 0;
|
|
|
|
/* There was no field separator at the end */
|
|
return w_addword (pwordexp, word);
|
|
|
|
do_error:
|
|
/* Error:
|
|
* free memory used (unless error is WRDE_NOSPACE), and
|
|
* set pwordexp members back to what they were.
|
|
*/
|
|
|
|
free (word);
|
|
|
|
if (error == WRDE_NOSPACE)
|
|
return WRDE_NOSPACE;
|
|
|
|
if ((flags & WRDE_APPEND) == 0)
|
|
wordfree (pwordexp);
|
|
|
|
*pwordexp = old_word;
|
|
return error;
|
|
}
|