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meillo@367
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1 /*
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meillo@367
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2 ** child.c
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meillo@367
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3 ** Copyright (C) 2000 by Oliver Kurth,
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meillo@367
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4 **
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meillo@367
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5 ** This program is free software; you can redistribute it and/or modify
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meillo@367
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6 ** it under the terms of the GNU General Public License as published by
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meillo@367
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7 ** the Free Software Foundation; either version 2 of the License, or
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meillo@367
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8 ** (at your option) any later version.
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meillo@367
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9 **
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10 ** This program is distributed in the hope that it will be useful,
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meillo@367
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11 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
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meillo@367
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12 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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meillo@367
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13 ** GNU General Public License for more details.
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meillo@367
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14 **
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15 ** You should have received a copy of the GNU General Public License
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meillo@367
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16 ** along with this program; if not, write to the Free Software
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meillo@367
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17 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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meillo@367
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18 */
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meillo@0
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19
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meillo@0
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20 #include <errno.h>
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meillo@0
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21 #include <stdio.h>
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meillo@0
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22 #include <stdlib.h>
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meillo@0
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23 #include <unistd.h>
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meillo@0
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24 #include <signal.h>
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meillo@0
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25 #include <sys/types.h>
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meillo@0
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26 #include <sys/socket.h>
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meillo@0
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27 #include <syslog.h>
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meillo@0
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28 #include <string.h>
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meillo@0
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29
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meillo@0
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30 #include "masqmail.h"
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31
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meillo@0
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32
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meillo@10
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33 int
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meillo@10
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34 child(const char *command)
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meillo@0
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35 {
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meillo@10
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36 int pipe[2];
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meillo@0
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37
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meillo@10
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38 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipe) == 0) {
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meillo@10
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39 pid_t pid;
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meillo@0
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40
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meillo@10
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41 pid = fork();
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meillo@10
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42 if (pid == 0) {
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meillo@10
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43 int i, max_fd = sysconf(_SC_OPEN_MAX);
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meillo@10
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44 /* child */
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meillo@10
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45 dup2(pipe[0], 0);
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meillo@10
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46 dup2(pipe[0], 1);
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meillo@10
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47 dup2(pipe[0], 2);
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meillo@0
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48
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meillo@10
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49 if (max_fd <= 0)
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50 max_fd = 64;
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meillo@10
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51 for (i = 3; i < max_fd; i++)
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52 close(i);
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53
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meillo@10
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54 {
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meillo@10
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55 char *argv[] = { "/bin/sh", "-c", (char *) command, NULL };
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meillo@10
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56 execve(*argv, argv, NULL);
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meillo@10
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57 }
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meillo@10
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58 logwrite(LOG_ALERT, "execve failed: %s\n", strerror(errno));
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meillo@262
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59 _exit(1);
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meillo@10
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60 } else if (pid == -1) {
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meillo@10
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61 return -1;
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meillo@10
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62 } else {
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meillo@10
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63 close(pipe[0]);
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meillo@10
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64 return pipe[1];
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meillo@10
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65 }
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meillo@10
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66 }
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meillo@10
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67 return -2;
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meillo@0
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68 }
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