release/src/router/rp-l2tp/main.c

   1 /***********************************************************************
   2 *
   3 * main.c
   4 *
   5 * Main program of l2tp
   6 *
   7 * Copyright (C) 2002 by Roaring Penguin Software Inc.
   8 *
   9 * This software may be distributed under the terms of the GNU General
  10 * Public License, Version 2, or (at your option) any later version.
  11 *
  12 * LIC: GPL
  13 *
  14 ***********************************************************************/
  15
  16 static char const RCSID[] =
  17 "$Id: main.c,v 1.1.48.1 2005/08/08 12:05:25 honor Exp $";
  18
  19 #include "l2tp.h"
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <getopt.h>
  23 #include <signal.h>
  24 #include <fcntl.h>
  25 #include <stdlib.h>
  26
  27 static void
  28 usage(int argc, char *argv[], int exitcode)
  29 {
  30     fprintf(stderr, "\nl2tpd Version %s Copyright 2002 Roaring Penguin Software Inc.\n", VERSION);
  31     fprintf(stderr, "http://www.roaringpenguin.com/\n\n");
  32     fprintf(stderr, "Usage: %s [options]\n", argv[0]);
  33     fprintf(stderr, "Options:\n");
  34     fprintf(stderr, "-d level               -- Set debugging to 'level'\n");
  35     fprintf(stderr, "-f                     -- Do not fork\n");
  36     fprintf(stderr, "-h                     -- Print usage\n");
  37     fprintf(stderr, "\nThis program is licensed under the terms of\nthe GNU General Public License, Version 2.\n");
  38     exit(exitcode);
  39 }
  40
  41 int
  42 main(int argc, char *argv[])
  43 {
  44     EventSelector *es = Event_CreateSelector();
  45     int i;
  46     int opt;
  47     int do_fork = 1;
  48     int debugmask = 0;
  49
  50     while((opt = getopt(argc, argv, "d:fh")) != -1) {
  51         switch(opt) {
  52         case 'h':
  53             usage(argc, argv, EXIT_SUCCESS);
  54             break;
  55         case 'f':
  56             do_fork = 0;
  57             break;
  58         case 'd':
  59             sscanf(optarg, "%d", &debugmask);
  60             break;
  61         default:
  62             usage(argc, argv, EXIT_FAILURE);
  63         }
  64     }
  65
  66     l2tp_random_init();
  67     l2tp_tunnel_init(es);
  68     l2tp_peer_init();
  69     l2tp_debug_set_bitmask(debugmask);
  70
  71     if (l2tp_parse_config_file(es, "/tmp/l2tp.conf") < 0) { //2005-04-14 by kanki
  72         l2tp_die();
  73     }
  74
  75     if (!l2tp_network_init(es)) {
  76         l2tp_die();
  77     }
  78
  79     /* Daemonize */
  80     if (do_fork) {
  81         i = fork();
  82         if (i < 0) {
  83             perror("fork");
  84             exit(EXIT_FAILURE);
  85         } else if (i != 0) {
  86             /* Parent */
  87             exit(EXIT_SUCCESS);
  88         }
  89
  90         setsid();
  91         signal(SIGHUP, SIG_IGN);
  92         i = fork();
  93         if (i < 0) {
  94             perror("fork");
  95             exit(EXIT_FAILURE);
  96         } else if (i != 0) {
  97             exit(EXIT_SUCCESS);
  98         }
  99
 100         chdir("/");
 101
 102         /* Point stdin/stdout/stderr to /dev/null */
 103         for (i=0; i<3; i++) {
 104             close(i);
 105         }
 106         i = open("/dev/console", O_RDWR); //2005-04-14 by kanki for debugging
 107         if (i >= 0) {
 108             dup2(i, 0);
 109             dup2(i, 1);
 110             dup2(i, 2);
 111             if (i > 2) close(i);
 112         }
 113     }
 114
 115     while(1) {
 116         i = Event_HandleEvent(es);
 117         if (i < 0) {
 118             fprintf(stderr, "Event_HandleEvent returned %d\n", i);
 119             l2tp_cleanup();
 120             exit(EXIT_FAILURE);
 121         }
 122     }
 123     return 0;
 124 }