masqmail
view src/child.c @ 160:60c92aa59911
added a script to guess the host's name
| author | meillo@marmaro.de |
|---|---|
| date | Thu, 08 Jul 2010 11:27:03 +0200 |
| parents | 26e34ae9a3e3 |
| children | fc1c6425c024 |
line source
1 /* child.c, Copyright (C) 2000 by Oliver Kurth,
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
16 */
18 #include <errno.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <unistd.h>
22 #include <signal.h>
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <syslog.h>
26 #include <string.h>
28 #include "masqmail.h"
31 int
32 child(const char *command)
33 {
34 int pipe[2];
36 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipe) == 0) {
37 pid_t pid;
39 pid = fork();
40 if (pid == 0) {
41 int i, max_fd = sysconf(_SC_OPEN_MAX);
42 /* child */
43 dup2(pipe[0], 0);
44 dup2(pipe[0], 1);
45 dup2(pipe[0], 2);
47 if (max_fd <= 0)
48 max_fd = 64;
49 for (i = 3; i < max_fd; i++)
50 close(i);
52 {
53 char *argv[] = { "/bin/sh", "-c", (char *) command, NULL };
54 execve(*argv, argv, NULL);
55 }
56 logwrite(LOG_ALERT, "execve failed: %s\n", strerror(errno));
57 _exit(EXIT_FAILURE);
58 } else if (pid == -1) {
59 return -1;
60 } else {
61 close(pipe[0]);
62 return pipe[1];
63 }
64 }
65 return -2;
66 }