zebra/main.c

   1 /*
   2  * zebra daemon main routine.
   3  * Copyright (C) 1997, 98 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "version.h"
  26 #include "getopt.h"
  27 #include "command.h"
  28 #include "thread.h"
  29 #include "filter.h"
  30 #include "memory.h"
  31 #include "prefix.h"
  32 #include "log.h"
  33
  34 #include "zebra/rib.h"
  35 #include "zebra/zserv.h"
  36 #include "zebra/debug.h"
  37 #include "zebra/rib.h"
  38
  39 /* Master of threads. */
  40 struct thread_master *master;
  41
  42 /* process id. */
  43 pid_t old_pid;
  44 pid_t pid;
  45
  46 /* Route retain mode flag. */
  47 int retain_mode = 0;
  48
  49 /* Don't delete kernel route. */
  50 int keep_kernel_mode = 0;
  51
  52 /* Command line options. */
  53 struct option longopts[] =
  54 {
  55   { "batch",       no_argument,       NULL, 'b'},
  56   { "daemon",      no_argument,       NULL, 'd'},
  57   { "keep_kernel", no_argument,       NULL, 'k'},
  58   { "log_mode",    no_argument,       NULL, 'l'},
  59   { "config_file", required_argument, NULL, 'f'},
  60   { "pid_file",    required_argument, NULL, 'i'},
  61   { "help",        no_argument,       NULL, 'h'},
  62   { "vty_addr",    required_argument, NULL, 'A'},
  63   { "vty_port",    required_argument, NULL, 'P'},
  64   { "retain",      no_argument,       NULL, 'r'},
  65   { "version",     no_argument,       NULL, 'v'},
  66   { 0 }
  67 };
  68
  69 /* Default configuration file path. */
  70 char config_current[] = DEFAULT_CONFIG_FILE;
  71 char config_default[] = SYSCONFDIR DEFAULT_CONFIG_FILE;
  72
  73 /* Process ID saved for use by init system */
  74 char *pid_file = PATH_ZEBRA_PID;
  75
  76 /* Help information display. */
  77 static void
  78 usage (char *progname, int status)
  79 {
  80   if (status != 0)
  81     fprintf (stderr, "Try `%s --help' for more information.\n", progname);
  82   else
  83     {
  84       printf ("Usage : %s [OPTION...]\n\n\
  85 Daemon which manages kernel routing table management and \
  86 redistribution between different routing protocols.\n\n\
  87 -b, --batch        Runs in batch mode\n\
  88 -d, --daemon       Runs in daemon mode\n\
  89 -f, --config_file  Set configuration file name\n\
  90 -i, --pid_file     Set process identifier file name\n\
  91 -k, --keep_kernel  Don't delete old routes which installed by zebra.\n\
  92 -l, --log_mode     Set verbose log mode flag\n\
  93 -A, --vty_addr     Set vty's bind address\n\
  94 -P, --vty_port     Set vty's port number\n\
  95 -r, --retain       When program terminates, retain added route by zebra.\n\
  96 -v, --version      Print program version\n\
  97 -h, --help         Display this help and exit\n\
  98 \n\
  99 Report bugs to %s\n", progname, ZEBRA_BUG_ADDRESS);
 100     }
 101
 102   exit (status);
 103 }
 104 \f
 105 /* SIGHUP handler. */
 106 void
 107 sighup (int sig)
 108 {
 109   zlog_info ("SIGHUP received");
 110
 111   /* Reload of config file. */
 112   ;
 113 }
 114
 115 /* SIGINT handler. */
 116 void
 117 sigint (int sig)
 118 {
 119   /* Decrared in rib.c */
 120   void rib_close ();
 121
 122   zlog_info ("Terminating on signal");
 123
 124   if (!retain_mode)
 125     rib_close ();
 126
 127   exit (0);
 128 }
 129
 130 /* SIGUSR1 handler. */
 131 void
 132 sigusr1 (int sig)
 133 {
 134   zlog_rotate (NULL);
 135 }
 136
 137 /* Signale wrapper. */
 138 RETSIGTYPE *
 139 signal_set (int signo, void (*func)(int))
 140 {
 141   int ret;
 142   struct sigaction sig;
 143   struct sigaction osig;
 144
 145   sig.sa_handler = func;
 146   sigemptyset (&sig.sa_mask);
 147   sig.sa_flags = 0;
 148 #ifdef SA_RESTART
 149   sig.sa_flags |= SA_RESTART;
 150 #endif /* SA_RESTART */
 151
 152   ret = sigaction (signo, &sig, &osig);
 153
 154   if (ret < 0)
 155     return (SIG_ERR);
 156   else
 157     return (osig.sa_handler);
 158 }
 159
 160 /* Initialization of signal handles. */
 161 void
 162 signal_init ()
 163 {
 164   signal_set (SIGHUP, sighup);
 165   signal_set (SIGINT, sigint);
 166   signal_set (SIGTERM, sigint);
 167   signal_set (SIGPIPE, SIG_IGN);
 168   signal_set (SIGUSR1, sigusr1);
 169 }
 170 \f
 171 /* Main startup routine. */
 172 int
 173 main (int argc, char **argv)
 174 {
 175   char *p;
 176   char *vty_addr = NULL;
 177   int vty_port = 0;
 178   int batch_mode = 0;
 179   int daemon_mode = 0;
 180   char *config_file = NULL;
 181   char *progname;
 182   struct thread thread;
 183   void rib_weed_tables ();
 184   void zebra_vty_init ();
 185
 186   /* Set umask before anything for security */
 187   umask (0027);
 188
 189   /* preserve my name */
 190   progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);
 191
 192   zlog_default = openzlog (progname, ZLOG_STDOUT, ZLOG_ZEBRA,
 193                            LOG_CONS|LOG_NDELAY|LOG_PID, LOG_DAEMON);
 194
 195   while (1)
 196     {
 197       int opt;
 198
 199       opt = getopt_long (argc, argv, "bdklf:hA:P:rv", longopts, 0);
 200
 201       if (opt == EOF)
 202         break;
 203
 204       switch (opt)
 205         {
 206         case 0:
 207           break;
 208         case 'b':
 209           batch_mode = 1;
 210         case 'd':
 211           daemon_mode = 1;
 212           break;
 213         case 'k':
 214           keep_kernel_mode = 1;
 215           break;
 216         case 'l':
 217           /* log_mode = 1; */
 218           break;
 219         case 'f':
 220           config_file = optarg;
 221           break;
 222         case 'A':
 223           vty_addr = optarg;
 224           break;
 225         case 'i':
 226           pid_file = optarg;
 227           break;
 228         case 'P':
 229           vty_port = atoi (optarg);
 230           break;
 231         case 'r':
 232           retain_mode = 1;
 233           break;
 234         case 'v':
 235           print_version (progname);
 236           exit (0);
 237           break;
 238         case 'h':
 239           usage (progname, 0);
 240           break;
 241         default:
 242           usage (progname, 1);
 243           break;
 244         }
 245     }
 246
 247   /* Make master thread emulator. */
 248   master = thread_master_create ();
 249
 250   /* Vty related initialize. */
 251   signal_init ();
 252   cmd_init (1);
 253   vty_init ();
 254   memory_init ();
 255
 256   /* Zebra related initialize. */
 257   zebra_init ();
 258   rib_init ();
 259   zebra_if_init ();
 260   zebra_debug_init ();
 261   zebra_vty_init ();
 262   access_list_init ();
 263   rtadv_init ();
 264
 265   /* For debug purpose. */
 266   /* SET_FLAG (zebra_debug_event, ZEBRA_DEBUG_EVENT); */
 267
 268   /* Make kernel routing socket. */
 269   kernel_init ();
 270   interface_list ();
 271   route_read ();
 272
 273   /* Sort VTY commands. */
 274   sort_node ();
 275
 276 #ifdef HAVE_SNMP
 277   zebra_snmp_init ();
 278 #endif /* HAVE_SNMP */
 279
 280   /* Clean up self inserted route. */
 281   if (! keep_kernel_mode)
 282     rib_sweep_route ();
 283
 284   /* Configuration file read*/
 285   vty_read_config (config_file, config_current, config_default);
 286
 287   /* Clean up rib. */
 288   rib_weed_tables ();
 289
 290   /* Exit when zebra is working in batch mode. */
 291   if (batch_mode)
 292     exit (0);
 293
 294   /* Needed for BSD routing socket. */
 295   old_pid = getpid ();
 296
 297   /* Daemonize. */
 298   if (daemon_mode)
 299     daemon (0, 0);
 300
 301   /* Output pid of zebra. */
 302   pid_output (pid_file);
 303
 304   /* Needed for BSD routing socket. */
 305   pid = getpid ();
 306
 307   /* Make vty server socket. */
 308   vty_serv_sock (vty_addr,
 309                  vty_port ? vty_port : ZEBRA_VTY_PORT, ZEBRA_VTYSH_PATH);
 310
 311   while (thread_fetch (master, &thread))
 312     thread_call (&thread);
 313
 314   /* Not reached... */
 315   exit (0);
 316 }