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 #include <syslog.h>
  27
  28 static void
  29 usage(int argc, char *argv[], int exitcode)
  30 {
  31     fprintf(stderr, "\nl2tpd Version %s Copyright 2002 Roaring Penguin Software Inc.\n", VERSION);
  32     fprintf(stderr, "http://www.roaringpenguin.com/\n\n");
  33     fprintf(stderr, "Usage: %s [options]\n", argv[0]);
  34     fprintf(stderr, "Options:\n");
  35     fprintf(stderr, "-d level               -- Set debugging to 'level'\n");
  36     fprintf(stderr, "-f                     -- Do not fork\n");
  37     fprintf(stderr, "-h                     -- Print usage\n");
  38     fprintf(stderr, "\nThis program is licensed under the terms of\nthe GNU General Public License, Version 2.\n");
  39     exit(exitcode);
  40 }
  41
  42 static void
  43 sighandler(int signum)
  44 {
  45     l2tp_cleanup();
  46     exit(EXIT_FAILURE);
  47 }
  48
  49 int
  50 main(int argc, char *argv[])
  51 {
  52     EventSelector *es = Event_CreateSelector();
  53     int i;
  54     int opt;
  55     int do_fork = 1;
  56     int debugmask = 0;
  57
  58     while((opt = getopt(argc, argv, "d:fh")) != -1) {
  59         switch(opt) {
  60         case 'h':
  61             usage(argc, argv, EXIT_SUCCESS);
  62             break;
  63         case 'f':
  64             do_fork = 0;
  65             break;
  66         case 'd':
  67             sscanf(optarg, "%d", &debugmask);
  68             break;
  69         default:
  70             usage(argc, argv, EXIT_FAILURE);
  71         }
  72     }
  73
  74     openlog(argv[0], LOG_PID, LOG_DAEMON);
  75     l2tp_random_init();
  76     l2tp_tunnel_init(es);
  77     l2tp_peer_init();
  78     l2tp_debug_set_bitmask(debugmask);
  79
  80     if (l2tp_parse_config_file(es, "/tmp/l2tp.conf") < 0) { //2005-04-14 by kanki
  81         l2tp_die();
  82     }
  83
  84     if (!l2tp_network_init(es)) {
  85         l2tp_die();
  86     }
  87
  88     /* Daemonize */
  89     if (do_fork) {
  90         i = fork();
  91         if (i < 0) {
  92             perror("fork");
  93             exit(EXIT_FAILURE);
  94         } else if (i != 0) {
  95             /* Parent */
  96             exit(EXIT_SUCCESS);
  97         }
  98
  99         setsid();
 100         signal(SIGHUP, SIG_IGN);
 101         i = fork();
 102         if (i < 0) {
 103             perror("fork");
 104             exit(EXIT_FAILURE);
 105         } else if (i != 0) {
 106             exit(EXIT_SUCCESS);
 107         }
 108
 109         chdir("/");
 110
 111         /* Point stdin/stdout/stderr to /dev/null */
 112         for (i=0; i<3; i++) {
 113             close(i);
 114         }
 115         i = open("/dev/console", O_RDWR); //2005-04-14 by kanki for debugging
 116         if (i >= 0) {
 117             dup2(i, 0);
 118             dup2(i, 1);
 119             dup2(i, 2);
 120             if (i > 2) close(i);
 121         }
 122     }
 123
 124     signal(SIGTERM, sighandler);
 125     signal(SIGINT, sighandler);
 126
 127     while(1) {
 128         i = Event_HandleEvent(es);
 129         if (i < 0) {
 130             fprintf(stderr, "Event_HandleEvent returned %d\n", i);
 131             l2tp_cleanup();
 132             exit(EXIT_FAILURE);
 133         }
 134     }
 135     return 0;
 136 }