/* POSIX.2 wordexp implementation.
- Copyright (C) 1997-2015 Free Software Foundation, Inc.
+ Copyright (C) 1997-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Tim Waugh <tim@cyberelk.demon.co.uk>.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
+ <https://www.gnu.org/licenses/>. */
-#include <alloca.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <libintl.h>
#include <paths.h>
#include <pwd.h>
-#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
-#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
-#include <wchar.h>
#include <wordexp.h>
-#include <kernel-features.h>
-
-#include <bits/libc-lock.h>
+#include <spawn.h>
+#include <scratch_buffer.h>
#include <_itoa.h>
-
-/* Undefine the following line for the production version. */
-/* #define NDEBUG 1 */
#include <assert.h>
-/* Get some device information. */
-#include <device-nrs.h>
-
/*
* This is a recursive-descent-style word expansion routine.
*/
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)
- internal_function;
+ const char *ifs_white, int 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)
- internal_function;
+ const char *ifs, const char *ifs_white);
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)
- internal_function;
-static int eval_expr (char *expr, long int *result) internal_function;
+ const char *ifs_white);
+static int eval_expr (char *expr, long int *result);
/* The w_*() functions manipulate word lists. */
}
static char *
-internal_function
w_addmem (char *buffer, size_t *actlen, size_t *maxlen, const char *str,
size_t len)
{
}
static char *
-internal_function
w_addstr (char *buffer, size_t *actlen, size_t *maxlen, const char *str)
/* (lengths exclude trailing zero) */
{
}
static int
-internal_function
w_addword (wordexp_t *pwordexp, char *word)
{
/* Add a word to the wordlist */
*/
static int
-internal_function
parse_backslash (char **word, size_t *word_length, size_t *max_length,
const char *words, size_t *offset)
{
}
static int
-internal_function
parse_qtd_backslash (char **word, size_t *word_length, size_t *max_length,
const char *words, size_t *offset)
{
}
static int
-internal_function
parse_tilde (char **word, size_t *word_length, size_t *max_length,
const char *words, size_t *offset, size_t wordc)
{
for (i = 1 + *offset; words[i]; i++)
{
- if (words[i] == ':' || words[i] == '/' || words[i] == ' ' ||
- words[i] == '\t' || words[i] == 0 )
+ if (words[i] == ':' || words[i] == '/' || words[i] == ' '
+ || words[i] == '\t' || words[i] == 0 )
break;
if (words[i] == '\\')
if (i == 1 + *offset)
{
/* Tilde appears on its own */
- uid_t uid;
- struct passwd pwd, *tpwd;
- int buflen = 1000;
char* home;
- char* buffer;
- int result;
/* POSIX.2 says ~ expands to $HOME and if HOME is unset the
results are unspecified. We do a lookup on the uid if
}
else
{
- uid = __getuid ();
- buffer = __alloca (buflen);
-
- while ((result = __getpwuid_r (uid, &pwd, buffer, buflen, &tpwd)) != 0
+ struct passwd pwd, *tpwd;
+ uid_t uid = __getuid ();
+ int result;
+ struct scratch_buffer tmpbuf;
+ scratch_buffer_init (&tmpbuf);
+
+ while ((result = __getpwuid_r (uid, &pwd,
+ tmpbuf.data, tmpbuf.length,
+ &tpwd)) != 0
&& errno == ERANGE)
- buffer = extend_alloca (buffer, buflen, buflen + 1000);
+ if (!scratch_buffer_grow (&tmpbuf))
+ return WRDE_NOSPACE;
if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL)
{
*word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
if (*word == NULL)
- return WRDE_NOSPACE;
+ {
+ scratch_buffer_free (&tmpbuf);
+ return WRDE_NOSPACE;
+ }
}
else
{
*word = w_addchar (*word, word_length, max_length, '~');
if (*word == NULL)
- return WRDE_NOSPACE;
+ {
+ scratch_buffer_free (&tmpbuf);
+ return WRDE_NOSPACE;
+ }
}
+ scratch_buffer_free (&tmpbuf);
}
}
else
/* Look up user name in database to get home directory */
char *user = strndupa (&words[1 + *offset], i - (1 + *offset));
struct passwd pwd, *tpwd;
- int buflen = 1000;
- char* buffer = __alloca (buflen);
int result;
+ struct scratch_buffer tmpbuf;
+ scratch_buffer_init (&tmpbuf);
- while ((result = __getpwnam_r (user, &pwd, buffer, buflen, &tpwd)) != 0
+ while ((result = __getpwnam_r (user, &pwd, tmpbuf.data, tmpbuf.length,
+ &tpwd)) != 0
&& errno == ERANGE)
- buffer = extend_alloca (buffer, buflen, buflen + 1000);
+ if (!scratch_buffer_grow (&tmpbuf))
+ return WRDE_NOSPACE;
if (result == 0 && tpwd != NULL && pwd.pw_dir)
*word = w_addstr (*word, word_length, max_length, pwd.pw_dir);
*word = w_addstr (*word, word_length, max_length, user);
}
+ scratch_buffer_free (&tmpbuf);
+
*offset = i - 1;
}
return *word ? 0 : WRDE_NOSPACE;
static int
-internal_function
do_parse_glob (const char *glob_word, char **word, size_t *word_length,
size_t *max_length, wordexp_t *pwordexp, const char *ifs,
const char *ifs_white)
}
static int
-internal_function
parse_glob (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)
}
static int
-internal_function
parse_squote (char **word, size_t *word_length, size_t *max_length,
const char *words, size_t *offset)
{
/* Functions to evaluate an arithmetic expression */
static int
-internal_function
eval_expr_val (char **expr, long int *result)
{
char *digit;
}
static int
-internal_function
eval_expr_multdiv (char **expr, long int *result)
{
long int arg;
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;
}
static int
-internal_function
eval_expr (char *expr, long int *result)
{
long int arg;
}
static int
-internal_function
parse_arith (char **word, size_t *word_length, size_t *max_length,
const char *words, size_t *offset, int flags, int bracket)
{
case '(':
++paren_depth;
+ /* Fall through. */
default:
expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]);
if (expr == NULL)
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 inline void
-internal_function __attribute__ ((always_inline))
-exec_comm_child (char *comm, int *fildes, int showerr, int noexec)
+static pid_t
+exec_comm_child (char *comm, int *fildes, bool showerr, bool noexec)
{
- const char *args[4] = { _PATH_BSHELL, "-c", comm, NULL };
+ pid_t pid = -1;
- /* Execute the command, or just check syntax? */
- if (noexec)
- args[1] = "-nc";
+ /* Execute the command, or just check syntax? */
+ const char *args[] = { _PATH_BSHELL, noexec ? "-nc" : "-c", comm, NULL };
- /* Redirect output. */
- if (__glibc_likely (fildes[1] != STDOUT_FILENO))
- {
- __dup2 (fildes[1], STDOUT_FILENO);
- __close (fildes[1]);
- }
- else
+ 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)
{
-#ifdef O_CLOEXEC
- /* Reset the close-on-exec flag (if necessary). */
-# ifndef __ASSUME_PIPE2
- if (__have_pipe2 > 0)
-# endif
- __fcntl (fildes[1], F_SETFD, 0);
-#endif
+ 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 == 0)
+ 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)
{
- struct stat64 st;
- int fd;
- __close (STDERR_FILENO);
- fd = __open (_PATH_DEVNULL, O_WRONLY);
- if (fd >= 0 && fd != STDERR_FILENO)
- {
- __dup2 (fd, STDERR_FILENO);
- __close (fd);
- }
- /* Be paranoid. Check that we actually opened the /dev/null
- device. */
- if (__builtin_expect (__fxstat64 (_STAT_VER, STDERR_FILENO, &st), 0) != 0
- || __builtin_expect (S_ISCHR (st.st_mode), 1) == 0
-#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR
- || st.st_rdev != makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR)
-#endif
- )
- /* It's not the /dev/null device. Stop right here. The
- problem is: how do we stop? We use _exit() with an
- hopefully unusual exit code. */
- _exit (90);
+ 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;
}
- /* Make sure the subshell doesn't field-split on our behalf. */
- __unsetenv ("IFS");
+ /* 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);
- __close (fildes[0]);
- __execve (_PATH_BSHELL, (char *const *) args, __environ);
+ strlist_free (&newenv);
+
+out:
+ __posix_spawn_file_actions_destroy (&fa);
- /* Bad. What now? */
- abort ();
+ return pid;
}
/* Function to execute a command and retrieve the results */
/* pwordexp contains NULL if field-splitting is forbidden */
static int
-internal_function
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)
size_t maxnewlines = 0;
char buffer[bufsize];
pid_t pid;
- int noexec = 0;
+ bool noexec = false;
/* Do nothing if command substitution should not succeed. */
if (flags & WRDE_NOCMD)
return WRDE_CMDSUB;
- /* Don't fork() unless necessary */
+ /* Don't posix_spawn unless necessary */
if (!comm || !*comm)
return 0;
-#ifdef O_CLOEXEC
-# ifndef __ASSUME_PIPE2
- if (__have_pipe2 >= 0)
-# endif
- {
- int r = __pipe2 (fildes, O_CLOEXEC);
-# ifndef __ASSUME_PIPE2
- if (__have_pipe2 == 0)
- __have_pipe2 = r != -1 || errno != ENOSYS ? 1 : -1;
-
- if (__have_pipe2 > 0)
-# endif
- if (r < 0)
- /* Bad */
- return WRDE_NOSPACE;
- }
-#endif
-#ifndef __ASSUME_PIPE2
-# ifdef O_CLOEXEC
- if (__have_pipe2 < 0)
-# endif
- if (__pipe (fildes) < 0)
- /* Bad */
- return WRDE_NOSPACE;
-#endif
+ if (__pipe2 (fildes, O_CLOEXEC) < 0)
+ return WRDE_NOSPACE;
again:
- if ((pid = __fork ()) < 0)
+ pid = exec_comm_child (comm, fildes, noexec ? false : flags & WRDE_SHOWERR,
+ noexec);
+ if (pid < 0)
{
- /* Bad */
__close (fildes[0]);
__close (fildes[1]);
return WRDE_NOSPACE;
}
- if (pid == 0)
- exec_comm_child (comm, fildes, noexec ? 0 : flags & WRDE_SHOWERR, noexec);
-
- /* Parent */
-
/* If we are just testing the syntax, only wait. */
if (noexec)
return (TEMP_FAILURE_RETRY (__waitpid (pid, &status, 0)) == pid
/* 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')
+ while (maxnewlines-- != 0
+ && *word_length > 0 && (*word)[*word_length - 1] == '\n')
{
(*word)[--*word_length] = '\0';
/* Check for syntax error (re-execute but with "-n" flag) */
if (buflen < 1 && status != 0)
{
- noexec = 1;
+ noexec = true;
goto again;
}
}
static int
-internal_function
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)
/* Go -- give script to the shell */
if (comm)
{
-#ifdef __libc_ptf_call
- /* We do not want the exec_comm call to be cut short
- by a thread cancellation since cleanup is very
- ugly. Therefore disable cancellation for
- now. */
- // XXX Ideally we do want the thread being cancelable.
- // XXX If demand is there we'll change it.
- int state = PTHREAD_CANCEL_ENABLE;
- __libc_ptf_call (pthread_setcancelstate,
- (PTHREAD_CANCEL_DISABLE, &state), 0);
-#endif
-
+ /* posix_spawn already handles thread cancellation. */
error = exec_comm (comm, word, word_length, max_length,
flags, pwordexp, ifs, ifs_white);
-
-#ifdef __libc_ptf_call
- __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0);
-#endif
-
free (comm);
}
(memchr (char_set "", ch, sizeof (char_set) - 1) != NULL)
static int
-internal_function
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)
#undef CHAR_IN_SET
static int
-internal_function
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,
}
static int
-internal_function
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)
case '\'':
squoting = 1 - squoting;
+ /* Fall through. */
default:
comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]);
if (comm == NULL)
}
static int
-internal_function
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)
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