release/src/router/zebra/ripd/rip_main.c

   1 /* RIPd main routine.
   2  * Copyright (C) 1997, 98 Kunihiro Ishiguro <kunihiro@zebra.org>
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  18  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19  * 02111-1307, USA.
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "version.h"
  25 #include "getopt.h"
  26 #include "thread.h"
  27 #include "command.h"
  28 #include "memory.h"
  29 #include "prefix.h"
  30 #include "filter.h"
  31 #include "keychain.h"
  32 #include "log.h"
  33
  34 #include "ripd/ripd.h"
  35
  36 /* ripd options. */
  37 static struct option longopts[] =
  38 {
  39   { "daemon",      no_argument,       NULL, 'd'},
  40   { "config_file", required_argument, NULL, 'f'},
  41   { "pid_file",    required_argument, NULL, 'i'},
  42   { "help",        no_argument,       NULL, 'h'},
  43   { "vty_addr",    required_argument, NULL, 'A'},
  44   { "vty_port",    required_argument, NULL, 'P'},
  45   { "retain",      no_argument,       NULL, 'r'},
  46   { "version",     no_argument,       NULL, 'v'},
  47   { 0 }
  48 };
  49
  50 /* Configuration file and directory. */
  51 char config_current[] = RIPD_DEFAULT_CONFIG;
  52 char config_default[] = SYSCONFDIR RIPD_DEFAULT_CONFIG;
  53 char *config_file = NULL;
  54
  55 /* ripd program name */
  56
  57 /* Route retain mode flag. */
  58 int retain_mode = 0;
  59
  60 /* RIP VTY bind address. */
  61 char *vty_addr = NULL;
  62
  63 /* RIP VTY connection port. */
  64 int vty_port = RIP_VTY_PORT;
  65
  66 /* Master of threads. */
  67 struct thread_master *master;
  68
  69 /* Process ID saved for use by init system */
  70 char *pid_file = PATH_RIPD_PID;
  71
  72 /* Help information display. */
  73 static void
  74 usage (char *progname, int status)
  75 {
  76   if (status != 0)
  77     fprintf (stderr, "Try `%s --help' for more information.\n", progname);
  78   else
  79     {
  80       printf ("Usage : %s [OPTION...]\n\
  81 Daemon which manages RIP version 1 and 2.\n\n\
  82 -d, --daemon       Runs in daemon mode\n\
  83 -f, --config_file  Set configuration file name\n\
  84 -i, --pid_file     Set process identifier file name\n\
  85 -A, --vty_addr     Set vty's bind address\n\
  86 -P, --vty_port     Set vty's port number\n\
  87 -r, --retain       When program terminates, retain added route by ripd.\n\
  88 -v, --version      Print program version\n\
  89 -h, --help         Display this help and exit\n\
  90 \n\
  91 Report bugs to %s\n", progname, ZEBRA_BUG_ADDRESS);
  92     }
  93
  94   exit (status);
  95 }
  96 \f
  97 /* Signale wrapper. */
  98 RETSIGTYPE *
  99 signal_set (int signo, void (*func)(int))
 100 {
 101   int ret;
 102   struct sigaction sig;
 103   struct sigaction osig;
 104
 105   sig.sa_handler = func;
 106   sigemptyset (&sig.sa_mask);
 107   sig.sa_flags = 0;
 108 #ifdef SA_RESTART
 109   sig.sa_flags |= SA_RESTART;
 110 #endif /* SA_RESTART */
 111
 112   ret = sigaction (signo, &sig, &osig);
 113
 114   if (ret < 0)
 115     return (SIG_ERR);
 116   else
 117     return (osig.sa_handler);
 118 }
 119
 120 /* SIGHUP handler. */
 121 void
 122 sighup (int sig)
 123 {
 124   zlog_info ("SIGHUP received");
 125   rip_clean ();
 126   rip_reset ();
 127   zlog_info ("ripd restarting!");
 128
 129   /* Reload config file. */
 130   vty_read_config (config_file, config_current, config_default);
 131
 132   /* Create VTY's socket */
 133   vty_serv_sock (vty_addr, vty_port, RIP_VTYSH_PATH);
 134
 135   /* Try to return to normal operation. */
 136 }
 137
 138 /* SIGINT handler. */
 139 void
 140 sigint (int sig)
 141 {
 142   zlog (NULL, LOG_INFO, "Terminating on signal");
 143
 144   if (! retain_mode)
 145     rip_clean ();
 146
 147   exit (0);
 148 }
 149
 150 /* SIGUSR1 handler. */
 151 void
 152 sigusr1 (int sig)
 153 {
 154   zlog_rotate (NULL);
 155 }
 156
 157 /* Initialization of signal handles. */
 158 void
 159 signal_init ()
 160 {
 161   signal_set (SIGHUP, sighup);
 162   signal_set (SIGINT, sigint);
 163   signal_set (SIGTERM, sigint);
 164   signal_set (SIGPIPE, SIG_IGN);
 165   signal_set (SIGUSR1, sigusr1);
 166 }
 167 \f
 168 /* Main routine of ripd. */
 169 int
 170 main (int argc, char **argv)
 171 {
 172   char *p;
 173   int daemon_mode = 0;
 174   char *progname;
 175   struct thread thread;
 176
 177   /* Set umask before anything for security */
 178   umask (0027);
 179
 180   /* Get program name. */
 181   progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);
 182
 183   /* First of all we need logging init. */
 184   zlog_default = openzlog (progname, ZLOG_NOLOG, ZLOG_RIP,
 185                            LOG_CONS|LOG_NDELAY|LOG_PID, LOG_DAEMON);
 186
 187   /* Command line option parse. */
 188   while (1)
 189     {
 190       int opt;
 191
 192       opt = getopt_long (argc, argv, "df:hA:P:rv", longopts, 0);
 193
 194       if (opt == EOF)
 195         break;
 196
 197       switch (opt)
 198         {
 199         case 0:
 200           break;
 201         case 'd':
 202           daemon_mode = 1;
 203           break;
 204         case 'f':
 205           config_file = optarg;
 206           break;
 207         case 'A':
 208           vty_addr = optarg;
 209           break;
 210         case 'i':
 211           pid_file = optarg;
 212           break;
 213         case 'P':
 214           vty_port = atoi (optarg);
 215           break;
 216         case 'r':
 217           retain_mode = 1;
 218           break;
 219         case 'v':
 220           print_version (progname);
 221           exit (0);
 222           break;
 223         case 'h':
 224           usage (progname, 0);
 225           break;
 226         default:
 227           usage (progname, 1);
 228           break;
 229         }
 230     }
 231
 232   /* Prepare master thread. */
 233   master = thread_master_create ();
 234
 235   /* Library initialization. */
 236   signal_init ();
 237   cmd_init (1);
 238   vty_init ();
 239   memory_init ();
 240   keychain_init ();
 241
 242   /* RIP related initialization. */
 243   rip_init ();
 244   rip_if_init ();
 245   rip_zclient_init ();
 246   rip_peer_init ();
 247
 248   /* Sort all installed commands. */
 249   sort_node ();
 250
 251   /* Get configuration file. */
 252   vty_read_config (config_file, config_current, config_default);
 253
 254   /* Change to the daemon program. */
 255   if (daemon_mode)
 256     daemon (0, 0);
 257
 258   /* Pid file create. */
 259   pid_output (pid_file);
 260
 261   /* Create VTY's socket */
 262   vty_serv_sock (vty_addr, vty_port, RIP_VTYSH_PATH);
 263
 264   /* Execute each thread. */
 265   while (thread_fetch (master, &thread))
 266     thread_call (&thread);
 267
 268   /* Not reached. */
 269   exit (0);
 270 }