isisd/isis_main.c

   1 /*
   2  * IS-IS Rout(e)ing protocol - isis_main.c
   3  *
   4  * Copyright (C) 2001,2002   Sampo Saaristo
   5  *                           Tampere University of Technology
   6  *                           Institute of Communications Engineering
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public Licenseas published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * more details.
  17
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  */
  22
  23 #include <stdio.h>
  24 #include <zebra.h>
  25
  26 #include "getopt.h"
  27 #include "thread.h"
  28 #include "log.h"
  29 #include <lib/version.h>
  30 #include "command.h"
  31 #include "vty.h"
  32 #include "memory.h"
  33 #include "stream.h"
  34 #include "if.h"
  35 #include "privs.h"
  36 #include "sigevent.h"
  37
  38 #include "isisd/dict.h"
  39 #include "include-netbsd/iso.h"
  40 #include "isisd/isis_constants.h"
  41 #include "isisd/isis_common.h"
  42 #include "isisd/isis_flags.h"
  43 #include "isisd/isis_circuit.h"
  44 #include "isisd/isisd.h"
  45 #include "isisd/isis_dynhn.h"
  46
  47 /* Default configuration file name */
  48 #define ISISD_DEFAULT_CONFIG "isisd.conf"
  49 /* Default vty port */
  50 #define ISISD_VTY_PORT       2608
  51
  52 /* isisd privileges */
  53 zebra_capabilities_t _caps_p[] = {
  54   ZCAP_RAW,
  55   ZCAP_BIND
  56 };
  57
  58 struct zebra_privs_t isisd_privs = {
  59 #if defined(QUAGGA_USER)
  60   .user = QUAGGA_USER,
  61 #endif
  62 #if defined QUAGGA_GROUP
  63   .group = QUAGGA_GROUP,
  64 #endif
  65 #ifdef VTY_GROUP
  66   .vty_group = VTY_GROUP,
  67 #endif
  68   .caps_p = _caps_p,
  69   .cap_num_p = 2,
  70   .cap_num_i = 0
  71 };
  72
  73 /* isisd options */
  74 struct option longopts[] = {
  75   {"daemon", no_argument, NULL, 'd'},
  76   {"config_file", required_argument, NULL, 'f'},
  77   {"pid_file", required_argument, NULL, 'i'},
  78   {"vty_addr", required_argument, NULL, 'A'},
  79   {"vty_port", required_argument, NULL, 'P'},
  80   {"user", required_argument, NULL, 'u'},
  81   {"version", no_argument, NULL, 'v'},
  82   {"help", no_argument, NULL, 'h'},
  83   {0}
  84 };
  85
  86 /* Configuration file and directory. */
  87 char config_default[] = SYSCONFDIR ISISD_DEFAULT_CONFIG;
  88 char *config_file = NULL;
  89
  90 /* isisd program name. */
  91 char *progname;
  92
  93 int daemon_mode = 0;
  94
  95 /* Master of threads. */
  96 struct thread_master *master;
  97
  98 /* Process ID saved for use by init system */
  99 char *pid_file = PATH_ISISD_PID;
 100
 101 /* for reload */
 102 char _cwd[MAXPATHLEN];
 103 char _progpath[MAXPATHLEN];
 104 int _argc;
 105 char **_argv;
 106 char **_envp;
 107
 108 /* Help information display. */
 109 static void
 110 usage (int status)
 111 {
 112   if (status != 0)
 113     fprintf (stderr, "Try `%s --help' for more information.\n", progname);
 114   else
 115     {
 116       printf ("Usage : %s [OPTION...]\n\n\
 117 Daemon which manages IS-IS routing\n\n\
 118 -d, --daemon       Runs in daemon mode\n\
 119 -f, --config_file  Set configuration file name\n\
 120 -i, --pid_file     Set process identifier file name\n\
 121 -A, --vty_addr     Set vty's bind address\n\
 122 -P, --vty_port     Set vty's port number\n\
 123 -u, --user         User and group to run as\n\
 124 -v, --version      Print program version\n\
 125 -h, --help         Display this help and exit\n\
 126 \n\
 127 Report bugs to sambo@cs.tut.fi\n", progname);
 128     }
 129
 130   exit (status);
 131 }
 132
 133
 134 void
 135 reload ()
 136 {
 137   zlog_info ("Reload");
 138   /* FIXME: Clean up func call here */
 139   vty_finish ();
 140   execve (_progpath, _argv, _envp);
 141 }
 142
 143 void
 144 terminate (int i)
 145 {
 146   exit (i);
 147 }
 148
 149 /*
 150  * Signal handlers
 151  */
 152
 153 void
 154 sighup (void)
 155 {
 156   zlog_info ("SIGHUP received");
 157   reload ();
 158
 159   return;
 160 }
 161
 162 void
 163 sigint (void)
 164 {
 165   zlog_info ("SIGINT received");
 166   terminate (0);
 167
 168   return;
 169 }
 170
 171 void
 172 sigterm (void)
 173 {
 174   zlog_info ("SIGTERM received");
 175   terminate (0);
 176 }
 177
 178 void
 179 sigusr1 (void)
 180 {
 181   zlog_info ("SIGUSR1 received");
 182   zlog_rotate (NULL);
 183 }
 184
 185 struct quagga_signal_t isisd_signals[] =
 186 {
 187   {
 188    .signal = SIGHUP,
 189    .handler = &sighup,
 190    },
 191   {
 192    .signal = SIGUSR1,
 193    .handler = &sigusr1,
 194    },
 195   {
 196    .signal = SIGINT,
 197    .handler = &sigint,
 198    },
 199   {
 200    .signal = SIGTERM,
 201    .handler = &sigterm,
 202    },
 203 };
 204
 205 /*
 206  * Main routine of isisd. Parse arguments and handle IS-IS state machine.
 207  */
 208 int
 209 main (int argc, char **argv, char **envp)
 210 {
 211   char *p;
 212   int opt, vty_port = ISISD_VTY_PORT;
 213   struct thread thread;
 214   char *config_file = NULL;
 215   char *vty_addr = NULL;
 216
 217   /* Get the programname without the preceding path. */
 218   progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);
 219
 220   zlog_default = openzlog (progname, ZLOG_NOLOG, ZLOG_ISIS,
 221                            LOG_CONS | LOG_NDELAY | LOG_PID, LOG_DAEMON);
 222
 223   /* for reload */
 224   _argc = argc;
 225   _argv = argv;
 226   _envp = envp;
 227   getcwd (_cwd, sizeof (_cwd));
 228   if (*argv[0] == '.')
 229     snprintf (_progpath, sizeof (_progpath), "%s/%s", _cwd, _argv[0]);
 230   else
 231     snprintf (_progpath, sizeof (_progpath), "%s", argv[0]);
 232
 233   /* Command line argument treatment. */
 234   while (1)
 235     {
 236       opt = getopt_long (argc, argv, "df:i:hA:p:P:u:v", longopts, 0);
 237
 238       if (opt == EOF)
 239         break;
 240
 241       switch (opt)
 242         {
 243         case 0:
 244           break;
 245         case 'd':
 246           daemon_mode = 1;
 247           break;
 248         case 'f':
 249           config_file = optarg;
 250           break;
 251         case 'i':
 252           pid_file = optarg;
 253           break;
 254         case 'A':
 255           vty_addr = optarg;
 256           break;
 257         case 'P':
 258           /* Deal with atoi() returning 0 on failure, and isisd not
 259              listening on isisd port... */
 260           if (strcmp (optarg, "0") == 0)
 261             {
 262               vty_port = 0;
 263               break;
 264             }
 265           vty_port = atoi (optarg);
 266           vty_port = (vty_port ? vty_port : ISISD_VTY_PORT);
 267           break;
 268         case 'u':
 269           isisd_privs.user = isisd_privs.group = optarg;
 270           break;
 271           break;
 272         case 'v':
 273           printf ("ISISd version %s\n", ISISD_VERSION);
 274           printf ("Copyright (c) 2001-2002 Sampo Saaristo,"
 275                   " Ofer Wald and Hannes Gredler\n");
 276           print_version ("Zebra");
 277           exit (0);
 278           break;
 279         case 'h':
 280           usage (0);
 281           break;
 282         default:
 283           usage (1);
 284           break;
 285         }
 286     }
 287
 288   /* thread master */
 289   master = thread_master_create ();
 290
 291   /* random seed from time */
 292   srand (time (NULL));
 293
 294   /*
 295    *  initializations
 296    */
 297   zprivs_init (&isisd_privs);
 298   signal_init (master, Q_SIGC (isisd_signals), isisd_signals);
 299   cmd_init (1);
 300   vty_init (master);
 301   memory_init ();
 302   isis_init ();
 303   dyn_cache_init ();
 304   sort_node ();
 305
 306   /* parse config file */
 307   /* this is needed three times! because we have interfaces before the areas */
 308   vty_read_config (config_file, config_default);
 309   vty_read_config (config_file, config_default);
 310   vty_read_config (config_file, config_default);
 311
 312   /* demonize */
 313   if (daemon_mode)
 314     daemon (0, 0);
 315
 316   /* Process ID file creation. */
 317   pid_output (pid_file);
 318
 319   /* Make isis vty socket. */
 320   vty_serv_sock (vty_addr, vty_port, ISIS_VTYSH_PATH);
 321
 322   /* Print banner. */
 323 #if defined(ZEBRA_VERSION)
 324   zlog_info ("ISISd %s starting: vty@%d", ZEBRA_VERSION, vty_port);
 325 #elif defined(QUAGGA_VERSION)
 326   zlog_info ("Quagga-ISISd %s starting: vty@%d", QUAGGA_VERSION, vty_port);
 327 #endif
 328 #ifdef HAVE_IPV6
 329   zlog_info ("IPv6 enabled");
 330 #endif
 331   /* Start finite state machine. */
 332   while (thread_fetch (master, &thread))
 333     thread_call (&thread);
 334
 335   /* Not reached. */
 336   exit (0);
 337 }