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1 /* child.c, Copyright (C) 2000 by Oliver Kurth,
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2 *
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3 * This program is free software; you can redistribute it and/or modify
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4 * it under the terms of the GNU General Public License as published by
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5 * the Free Software Foundation; either version 2 of the License, or
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6 * (at your option) any later version.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * You should have received a copy of the GNU General Public License
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14 * along with this program; if not, write to the Free Software
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15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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16 */
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17
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18 #include <errno.h>
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19 #include <stdio.h>
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20 #include <stdlib.h>
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21 #include <unistd.h>
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22 #include <signal.h>
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23 #include <sys/types.h>
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24 #include <sys/socket.h>
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25 #include <syslog.h>
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26 #include <string.h>
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27
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28 #include "masqmail.h"
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29
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30 int volatile sigchild_seen = 0;
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31
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32 static void
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33 sigchild_handler(int sig)
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34 {
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35 sigchild_seen = 1;
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36 signal(SIGHUP, sigchild_handler);
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37 }
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38
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39 int
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40 child(const char *command)
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41 {
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42 int pipe[2];
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43
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44 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipe) == 0) {
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45 pid_t pid;
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46
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47 /*
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48 sigchild_seen = 0;
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49 signal(SIGCHLD, sigchild_handler);
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50 */
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51
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52 pid = fork();
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53 if (pid == 0) {
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54 int i, max_fd = sysconf(_SC_OPEN_MAX);
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55 /* child */
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56 dup2(pipe[0], 0);
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57 dup2(pipe[0], 1);
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58 dup2(pipe[0], 2);
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59
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60 if (max_fd <= 0)
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61 max_fd = 64;
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62 for (i = 3; i < max_fd; i++)
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63 close(i);
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64
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65 {
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66 char *argv[] = { "/bin/sh", "-c", (char *) command, NULL };
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67 execve(*argv, argv, NULL);
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68 }
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69 logwrite(LOG_ALERT, "execve failed: %s\n", strerror(errno));
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70 _exit(EXIT_FAILURE);
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71 } else if (pid == -1) {
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72 return -1;
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73 } else {
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74 close(pipe[0]);
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75 return pipe[1];
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76 }
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77 }
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78 return -2;
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79 }
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