masqmail

annotate src/child.c @ 156:ee2afbf92428

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require host_name to be set in config file exit otherwise there is no portable way to determine the hostname (actually the hostname that masqmail should use) thus it must be set by the administrator
author meillo@marmaro.de
date Thu, 08 Jul 2010 09:49:05 +0200
parents 26e34ae9a3e3
children fc1c6425c024
rev   line source
meillo@0 1 /* child.c, Copyright (C) 2000 by Oliver Kurth,
meillo@0 2 *
meillo@0 3 * This program is free software; you can redistribute it and/or modify
meillo@0 4 * it under the terms of the GNU General Public License as published by
meillo@0 5 * the Free Software Foundation; either version 2 of the License, or
meillo@0 6 * (at your option) any later version.
meillo@10 7 *
meillo@0 8 * This program is distributed in the hope that it will be useful,
meillo@0 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@0 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
meillo@0 11 * GNU General Public License for more details.
meillo@0 12 *
meillo@0 13 * You should have received a copy of the GNU General Public License
meillo@0 14 * along with this program; if not, write to the Free Software
meillo@0 15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
meillo@0 16 */
meillo@0 17
meillo@0 18 #include <errno.h>
meillo@0 19 #include <stdio.h>
meillo@0 20 #include <stdlib.h>
meillo@0 21 #include <unistd.h>
meillo@0 22 #include <signal.h>
meillo@0 23 #include <sys/types.h>
meillo@0 24 #include <sys/socket.h>
meillo@0 25 #include <syslog.h>
meillo@0 26 #include <string.h>
meillo@0 27
meillo@0 28 #include "masqmail.h"
meillo@0 29
meillo@0 30
meillo@10 31 int
meillo@10 32 child(const char *command)
meillo@0 33 {
meillo@10 34 int pipe[2];
meillo@0 35
meillo@10 36 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipe) == 0) {
meillo@10 37 pid_t pid;
meillo@0 38
meillo@10 39 pid = fork();
meillo@10 40 if (pid == 0) {
meillo@10 41 int i, max_fd = sysconf(_SC_OPEN_MAX);
meillo@10 42 /* child */
meillo@10 43 dup2(pipe[0], 0);
meillo@10 44 dup2(pipe[0], 1);
meillo@10 45 dup2(pipe[0], 2);
meillo@0 46
meillo@10 47 if (max_fd <= 0)
meillo@10 48 max_fd = 64;
meillo@10 49 for (i = 3; i < max_fd; i++)
meillo@10 50 close(i);
meillo@10 51
meillo@10 52 {
meillo@10 53 char *argv[] = { "/bin/sh", "-c", (char *) command, NULL };
meillo@10 54 execve(*argv, argv, NULL);
meillo@10 55 }
meillo@10 56 logwrite(LOG_ALERT, "execve failed: %s\n", strerror(errno));
meillo@10 57 _exit(EXIT_FAILURE);
meillo@10 58 } else if (pid == -1) {
meillo@10 59 return -1;
meillo@10 60 } else {
meillo@10 61 close(pipe[0]);
meillo@10 62 return pipe[1];
meillo@10 63 }
meillo@10 64 }
meillo@10 65 return -2;
meillo@0 66 }