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/* $OpenBSD: popen.c,v 1.31 2019/06/28 13:32:47 deraadt 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. 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.
*
*/
/* this came out of the ftpd sources; it's been modified to avoid the
* globbing stuff since we don't need it. also execvp instead of execv.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <bitstring.h> /* for structs.h */
#include <err.h>
#include <errno.h>
#include <login_cap.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <time.h> /* for structs.h */
#include "macros.h"
#include "structs.h"
#include "funcs.h"
#define MAX_ARGV 100
#define MAX_GARGV 1000
/*
* Special version of popen which avoids call to shell
*/
FILE *
cron_popen(char *program, char *type, struct passwd *pw, pid_t *pidptr)
{
char *cp;
FILE *iop;
int argc, pdes[2];
pid_t pid;
char *argv[MAX_ARGV];
if ((*type != 'r' && *type != 'w') || type[1] != '\0')
return (NULL);
if (pipe(pdes) == -1)
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;
switch (pid = fork()) {
case -1: /* error */
(void)close(pdes[0]);
(void)close(pdes[1]);
return (NULL);
/* NOTREACHED */
case 0: /* child */
if (pw) {
if (setusercontext(0, pw, pw->pw_uid, LOGIN_SETALL) == -1) {
syslog(LOG_ERR,
"(%s) SETUSERCONTEXT FAILED (%m)",
pw->pw_name);
warn("setusercontext failed for %s",
pw->pw_name);
_exit(EXIT_FAILURE);
}
}
if (*type == 'r') {
if (pdes[1] != STDOUT_FILENO) {
dup2(pdes[1], STDOUT_FILENO);
(void)close(pdes[1]);
}
dup2(STDOUT_FILENO, STDERR_FILENO);
(void)close(pdes[0]);
} else {
if (pdes[0] != STDIN_FILENO) {
dup2(pdes[0], STDIN_FILENO);
(void)close(pdes[0]);
}
(void)close(pdes[1]);
}
execvp(argv[0], argv);
_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]);
}
*pidptr = pid;
return (iop);
}
int
cron_pclose(FILE *iop, pid_t pid)
{
int rv;
int status;
sigset_t sigset, osigset;
(void)fclose(iop);
sigemptyset(&sigset);
sigaddset(&sigset, SIGINT);
sigaddset(&sigset, SIGQUIT);
sigaddset(&sigset, SIGHUP);
sigprocmask(SIG_BLOCK, &sigset, &osigset);
while ((rv = waitpid(pid, &status, 0)) == -1 && errno == EINTR)
continue;
sigprocmask(SIG_SETMASK, &osigset, NULL);
if (rv == -1)
return (rv);
if (WIFEXITED(status))
return (WEXITSTATUS(status));
return (1);
}
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