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popen.c
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C/C++ Source or Header
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1996-09-28
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5KB
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207 lines
/*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software written by Ken Arnold and
* published in UNIX Review, Vol. 6, No. 8.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#ifndef lint
static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94";
#endif /* not lint */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <glob.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
/*
* Special version of popen which avoids call to shell. This ensures noone
* may create a pipe to a hidden program as a side effect of a list or dir
* command.
*/
struct file_pid {
FILE *file;
pid_t pid;
struct file_pid *next;
};
/* A linked list associating ftpd_popen'd FILEs with pids. */
struct file_pid *file_pids = 0;
FILE *
ftpd_popen(program, type)
char *program, *type;
{
char *cp;
FILE *iop;
struct file_pid *fpid;
int argc, gargc, pdes[2], pid;
char **pop, *argv[100], *gargv[1000];
if (*type != 'r' && *type != 'w' || type[1])
return (NULL);
if (pipe(pdes) < 0)
return (NULL);
/* break up string into pieces */
for (argc = 0, cp = program;; cp = NULL)
if (!(argv[argc++] = strtok(cp, " \t\n")))
break;
/* glob each piece */
gargv[0] = argv[0];
for (gargc = argc = 1; argv[argc]; argc++) {
glob_t gl;
int flags = GLOB_NOCHECK;
#ifdef GLOB_BRACE
flags |= GLOB_BRACE;
#endif
#ifdef GLOB_QUOTE
flags |= GLOB_QUOTE;
#endif
#ifdef GLOB_TILDE
flags |= GLOB_TILDE;
#endif
memset(&gl, 0, sizeof(gl));
if (glob(argv[argc], flags, NULL, &gl))
gargv[gargc++] = strdup(argv[argc]);
else
for (pop = gl.gl_pathv; *pop; pop++)
gargv[gargc++] = strdup(*pop);
globfree(&gl);
}
gargv[gargc] = NULL;
iop = NULL;
switch(pid = vfork()) {
case -1: /* error */
(void)close(pdes[0]);
(void)close(pdes[1]);
goto pfree;
/* NOTREACHED */
case 0: /* child */
if (*type == 'r') {
if (pdes[1] != STDOUT_FILENO) {
dup2(pdes[1], STDOUT_FILENO);
(void)close(pdes[1]);
}
dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */
(void)close(pdes[0]);
} else {
if (pdes[0] != STDIN_FILENO) {
dup2(pdes[0], STDIN_FILENO);
(void)close(pdes[0]);
}
(void)close(pdes[1]);
}
execv(gargv[0], gargv);
_exit(1);
}
/* parent; assume fdopen can't fail... */
if (*type == 'r') {
iop = fdopen(pdes[0], type);
(void)close(pdes[1]);
} else {
iop = fdopen(pdes[1], type);
(void)close(pdes[0]);
}
fpid = malloc (sizeof (struct file_pid));
if (fpid) {
fpid->file = iop;
fpid->pid = pid;
fpid->next = file_pids;
file_pids = fpid;
}
pfree: for (argc = 1; gargv[argc] != NULL; argc++)
free(gargv[argc]);
return (iop);
}
int
ftpd_pclose(iop)
FILE *iop;
{
struct file_pid *fpid = file_pids, *prev_fpid = 0;
int fdes, omask, status;
pid_t pid;
/*
* pclose returns -1 if stream is not associated with a
* `popened' command, or, if already `pclosed'.
*/
while (fpid && fpid->file != iop) {
prev_fpid = fpid;
fpid = fpid->next;
}
if (! fpid)
return -1;
if (prev_fpid)
prev_fpid->next = fpid->next;
else
file_pids = fpid->next;
(void)fclose(iop);
omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
while ((pid = waitpid(fpid->pid, &status, 0)) < 0 && errno == EINTR)
continue;
free (fpid);
(void)sigsetmask(omask);
if (pid < 0)
return (pid);
if (WIFEXITED(status))
return (WEXITSTATUS(status));
return (1);
}