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/* $OpenBSD: popen.c,v 1.12 2001/10/24 17:28:16 millert Exp $ */
/*
* 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.
*
* 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
#if 0
static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94";
#else
static char rcsid[] = "$OpenBSD: popen.c,v 1.12 2001/10/24 17:28:16 millert Exp $";
#endif
#endif /* not lint */
#include "cron.h"
#define MAX_ARGV 100
#define MAX_GARGV 1000
#define WANT_GLOBBING 0
/*
* 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.
*/
static PID_T *pids;
static int fds;
FILE *
cron_popen(program, type, e)
char *program;
char *type;
entry *e;
{
char *cp;
FILE * volatile iop;
int argc, pdes[2];
PID_T pid;
char *argv[MAX_ARGV];
#if WANT_GLOBBING
char **pop, *gargv[MAX_GARGV];
int gargc;
#endif
if ((*type != 'r' && *type != 'w') || type[1])
return (NULL);
if (!pids) {
if ((fds = sysconf(_SC_OPEN_MAX)) <= 0)
return (NULL);
if (!(pids = (PID_T *)malloc((size_t)(fds * sizeof(int)))))
return (NULL);
bzero(pids, fds * sizeof(PID_T));
}
if (pipe(pdes) < 0)
return (NULL);
/* break up string into pieces */
for (argc = 0, cp = program;argc < MAX_ARGV-1; cp = NULL)
if (!(argv[argc++] = strtok(cp, " \t\n")))
break;
argv[MAX_ARGV-1] = NULL;
#if WANT_GLOBBING
/* glob each piece */
gargv[0] = argv[0];
for (gargc = argc = 1; argv[argc]; argc++) {
glob_t gl;
bzero(&gl, sizeof(gl));
if (glob(argv[argc],
GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT,
NULL, &gl)) {
if (gargc < MAX_GARGV-1) {
gargv[gargc++] = strdup(argv[argc]);
if (gargv[gargc -1] == NULL)
fatal ("Out of memory");
}
} else
for (pop = gl.gl_pathv; *pop && gargc < MAX_GARGV-1; pop++) {
gargv[gargc++] = strdup(*pop);
if (gargv[gargc - 1] == NULL)
fatal ("Out of memory");
}
globfree(&gl);
}
gargv[gargc] = NULL;
#endif
iop = NULL;
switch(pid = fork()) {
case -1: /* error */
(void)close(pdes[0]);
(void)close(pdes[1]);
goto pfree;
/* NOTREACHED */
case 0: /* child */
if (e) {
#if defined(LOGIN_CAP)
struct passwd *pwd;
pwd = getpwuid(e->uid);
if (pwd == NULL) {
fprintf(stderr, "getpwuid: couldn't get entry for %d\n", e->uid);
_exit(ERROR_EXIT);
}
if (setusercontext(0, pwd, e->uid, LOGIN_SETALL) < 0) {
fprintf(stderr, "setusercontext failed for %d\n", e->uid);
_exit(ERROR_EXIT);
}
#else
if (setgid(e->gid) ||
setgroups(0, NULL) ||
initgroups(env_get("LOGNAME", e->envp), e->gid))
_exit(1);
setlogin(env_get("LOGNAME", e->envp));
if (setuid(e->uid))
_exit(1);
chdir(env_get("HOME", e->envp));
#endif /* LOGIN_CAP */
}
closelog();
if (*type == 'r') {
if (pdes[1] != STDOUT) {
dup2(pdes[1], STDOUT);
(void)close(pdes[1]);
}
dup2(STDOUT, STDERR); /* stderr too! */
(void)close(pdes[0]);
} else {
if (pdes[0] != STDIN) {
dup2(pdes[0], STDIN);
(void)close(pdes[0]);
}
(void)close(pdes[1]);
}
#if WANT_GLOBBING
execvp(gargv[0], gargv);
#else
execvp(argv[0], argv);
#endif
_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]);
}
pids[fileno(iop)] = pid;
pfree:
#if WANT_GLOBBING
for (argc = 1; gargv[argc] != NULL; argc++)
free(gargv[argc]);
#endif
return (iop);
}
int
cron_pclose(iop)
FILE *iop;
{
int fdes;
PID_T pid;
WAIT_T status;
sigset_t sigset, osigset;
/*
* pclose returns -1 if stream is not associated with a
* `popened' command, or, if already `pclosed'.
*/
if (pids == 0 || pids[fdes = fileno(iop)] == 0)
return (-1);
(void)fclose(iop);
sigemptyset(&sigset);
sigaddset(&sigset, SIGINT);
sigaddset(&sigset, SIGQUIT);
sigaddset(&sigset, SIGHUP);
sigprocmask(SIG_BLOCK, &sigset, &osigset);
while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
continue;
sigprocmask(SIG_SETMASK, &osigset, NULL);
pids[fdes] = 0;
if (pid < 0)
return (pid);
if (WIFEXITED(status))
return (WEXITSTATUS(status));
return (1);
}
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