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/* Copyright (C) 2002 by Red Hat, Incorporated. All rights reserved.
*
* Permission to use, copy, modify, and distribute this software
* is freely granted, provided that this notice is preserved.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <glob.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include <wordexp.h>
#define MAXLINELEN 500
/* Note: This implementation of wordexp requires a version of bash
that supports the --wordexp and --protected arguments to be present
on the system. It does not support the WRDE_UNDEF flag. */
int
wordexp(const char *words, wordexp_t *pwordexp, int flags)
{
FILE *f;
FILE *f_err;
char tmp[MAXLINELEN];
int i = 0;
int offs = 0;
char *iter;
pid_t pid;
int num_words = 0;
int num_bytes = 0;
int fd[2];
int fd_err[2];
int err = 0;
if (pwordexp == NULL)
{
return WRDE_NOSPACE;
}
if (flags & WRDE_REUSE)
wordfree(pwordexp);
if ((flags & WRDE_APPEND) == 0)
{
pwordexp->we_wordc = 0;
pwordexp->we_wordv = NULL;
}
if (flags & WRDE_DOOFFS)
{
offs = pwordexp->we_offs;
if(!(pwordexp->we_wordv = (char **)realloc(pwordexp->we_wordv, (pwordexp->we_wordc + offs + 1) * sizeof(char *))))
return WRDE_NOSPACE;
for (i = 0; i < offs; i++)
pwordexp->we_wordv[i] = NULL;
}
pipe(fd);
pipe(fd_err);
pid = fork();
if (pid > 0)
{
/* In parent process. */
/* Close write end of parent's pipe. */
close(fd[1]);
close(fd_err[1]);
/* f_err is the standard error from the shell command. */
f_err = fdopen(fd_err[0], "r");
/* Check for errors. */
if (fgets(tmp, MAXLINELEN, f_err))
{
if (strstr(tmp, "EOF"))
err = WRDE_SYNTAX;
else if (strstr(tmp, "`\n'") || strstr(tmp, "`|'")
|| strstr(tmp, "`&'") || strstr(tmp, "`;'")
|| strstr(tmp, "`<'") || strstr(tmp, "`>'")
|| strstr(tmp, "`('") || strstr(tmp, "`)'")
|| strstr(tmp, "`{'") || strstr(tmp, "`}'"))
err = WRDE_BADCHAR;
else if (strstr(tmp, "command substitution"))
err = WRDE_CMDSUB;
else
err = WRDE_SYNTAX;
if (flags & WRDE_SHOWERR)
{
fprintf(stderr, tmp);
while(fgets(tmp, MAXLINELEN, f_err))
fprintf(stderr, tmp);
}
return err;
}
/* f is the standard output from the shell command. */
f = fdopen(fd[0], "r");
/* Get number of words expanded by shell. */
fgets(tmp, MAXLINELEN, f);
if((iter = strchr(tmp, '\n')))
*iter = '\0';
num_words = atoi(tmp);
if(!(pwordexp->we_wordv = (char **)realloc(pwordexp->we_wordv,
(pwordexp->we_wordc + num_words + offs + 1) * sizeof(char *))))
return WRDE_NOSPACE;
/* Get number of bytes required for storage of num_words words. */
fgets(tmp, MAXLINELEN, f);
if((iter = strchr(tmp, '\n')))
*iter = '\0';
num_bytes = atoi(tmp) + pwordexp->we_wordc;
/* Get each expansion from the shell output, and store each in
pwordexp's we_wordv vector. */
for(i = 0; i < num_words; i++)
{
fgets(tmp, MAXLINELEN, f);
if((iter = strchr(tmp, '\n')))
*iter = '\0';
pwordexp->we_wordv[pwordexp->we_wordc + offs + i] = strdup(tmp);
}
pwordexp->we_wordv[pwordexp->we_wordc + offs + i] = NULL;
pwordexp->we_wordc += num_words;
close(fd[0]);
close(fd_err[0]);
/* Wait for child to finish. */
waitpid (pid, NULL, 0);
return WRDE_SUCCESS;
}
else
{
/* In child process. */
/* Close read end of child's pipe. */
close(fd[0]);
close(fd_err[0]);
/* Pipe standard output to parent process via fd. */
if (fd[1] != STDOUT_FILENO)
{
dup2(fd[1], STDOUT_FILENO);
/* fd[1] no longer required. */
close(fd[1]);
}
/* Pipe standard error to parent process via fd_err. */
if (fd_err[1] != STDERR_FILENO)
{
dup2(fd_err[1], STDERR_FILENO);
/* fd_err[1] no longer required. */
close(fd_err[1]);
}
if (flags & WRDE_NOCMD)
execl("/bin/bash", "bash", "--protected", "--wordexp", words, (char *)0);
else
execl("/bin/bash", "bash", "--wordexp", words, (char *)0);
}
return WRDE_SUCCESS;
}
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