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 <zebra.h>
  24
  25 #include "getopt.h"
  26 #include "thread.h"
  27 #include "log.h"
  28 #include <lib/version.h>
  29 #include "command.h"
  30 #include "vty.h"
  31 #include "memory.h"
  32 #include "stream.h"
  33 #include "if.h"
  34 #include "privs.h"
  35 #include "sigevent.h"
  36 #include "filter.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_NET_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   {"group", required_argument, NULL, 'g'},
  82   {"version", no_argument, NULL, 'v'},
  83   {"dryrun", no_argument, NULL, 'C'},
  84   {"help", no_argument, NULL, 'h'},
  85   {0}
  86 };
  87
  88 /* Configuration file and directory. */
  89 char config_default[] = SYSCONFDIR ISISD_DEFAULT_CONFIG;
  90 char *config_file = NULL;
  91
  92 /* isisd program name. */
  93 char *progname;
  94
  95 int daemon_mode = 0;
  96
  97 /* Master of threads. */
  98 struct thread_master *master;
  99
 100 /* Process ID saved for use by init system */
 101 const char *pid_file = PATH_ISISD_PID;
 102
 103 /* for reload */
 104 char _cwd[MAXPATHLEN];
 105 char _progpath[MAXPATHLEN];
 106 int _argc;
 107 char **_argv;
 108 char **_envp;
 109
 110 /*
 111  * Prototypes.
 112  */
 113 void reload(void);
 114 void sighup(void);
 115 void sigint(void);
 116 void sigterm(void);
 117 void sigusr1(void);
 118
 119
 120 /* Help information display. */
 121 static void
 122 usage (int status)
 123 {
 124   if (status != 0)
 125     fprintf (stderr, "Try `%s --help' for more information.\n", progname);
 126   else
 127     {
 128       printf ("Usage : %s [OPTION...]\n\n\
 129 Daemon which manages IS-IS routing\n\n\
 130 -d, --daemon       Runs in daemon mode\n\
 131 -f, --config_file  Set configuration file name\n\
 132 -i, --pid_file     Set process identifier file name\n\
 133 -A, --vty_addr     Set vty's bind address\n\
 134 -P, --vty_port     Set vty's port number\n\
 135 -u, --user         User to run as\n\
 136 -g, --group        Group to run as\n\
 137 -v, --version      Print program version\n\
 138 -C, --dryrun       Check configuration for validity and exit\n\
 139 -h, --help         Display this help and exit\n\
 140 \n\
 141 Report bugs to http://bugzilla.quagga.net\n", progname);
 142     }
 143
 144   exit (status);
 145 }
 146
 147
 148 void
 149 reload ()
 150 {
 151   zlog_debug ("Reload");
 152   /* FIXME: Clean up func call here */
 153   vty_reset ();
 154   execve (_progpath, _argv, _envp);
 155 }
 156
 157 static void
 158 terminate (int i)
 159 {
 160   exit (i);
 161 }
 162
 163 /*
 164  * Signal handlers
 165  */
 166
 167 void
 168 sighup (void)
 169 {
 170   zlog_debug ("SIGHUP received");
 171   reload ();
 172
 173   return;
 174 }
 175
 176 void
 177 sigint (void)
 178 {
 179   zlog_notice ("Terminating on signal SIGINT");
 180   terminate (0);
 181 }
 182
 183 void
 184 sigterm (void)
 185 {
 186   zlog_notice ("Terminating on signal SIGTERM");
 187   terminate (0);
 188 }
 189
 190 void
 191 sigusr1 (void)
 192 {
 193   zlog_debug ("SIGUSR1 received");
 194   zlog_rotate (NULL);
 195 }
 196
 197 struct quagga_signal_t isisd_signals[] =
 198 {
 199   {
 200    .signal = SIGHUP,
 201    .handler = &sighup,
 202    },
 203   {
 204    .signal = SIGUSR1,
 205    .handler = &sigusr1,
 206    },
 207   {
 208    .signal = SIGINT,
 209    .handler = &sigint,
 210    },
 211   {
 212    .signal = SIGTERM,
 213    .handler = &sigterm,
 214    },
 215 };
 216
 217 /*
 218  * Main routine of isisd. Parse arguments and handle IS-IS state machine.
 219  */
 220 int
 221 main (int argc, char **argv, char **envp)
 222 {
 223   char *p;
 224   int opt, vty_port = ISISD_VTY_PORT;
 225   struct thread thread;
 226   char *config_file = NULL;
 227   char *vty_addr = NULL;
 228   int dryrun = 0;
 229
 230   /* Get the programname without the preceding path. */
 231   progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);
 232
 233   zlog_default = openzlog (progname, ZLOG_ISIS,
 234                            LOG_CONS | LOG_NDELAY | LOG_PID, LOG_DAEMON);
 235
 236   /* for reload */
 237   _argc = argc;
 238   _argv = argv;
 239   _envp = envp;
 240   getcwd (_cwd, sizeof (_cwd));
 241   if (*argv[0] == '.')
 242     snprintf (_progpath, sizeof (_progpath), "%s/%s", _cwd, _argv[0]);
 243   else
 244     snprintf (_progpath, sizeof (_progpath), "%s", argv[0]);
 245
 246   /* Command line argument treatment. */
 247   while (1)
 248     {
 249       opt = getopt_long (argc, argv, "df:i:hA:p:P:u:g:vC", longopts, 0);
 250
 251       if (opt == EOF)
 252         break;
 253
 254       switch (opt)
 255         {
 256         case 0:
 257           break;
 258         case 'd':
 259           daemon_mode = 1;
 260           break;
 261         case 'f':
 262           config_file = optarg;
 263           break;
 264         case 'i':
 265           pid_file = optarg;
 266           break;
 267         case 'A':
 268           vty_addr = optarg;
 269           break;
 270         case 'P':
 271           /* Deal with atoi() returning 0 on failure, and isisd not
 272              listening on isisd port... */
 273           if (strcmp (optarg, "0") == 0)
 274             {
 275               vty_port = 0;
 276               break;
 277             }
 278           vty_port = atoi (optarg);
 279           vty_port = (vty_port ? vty_port : ISISD_VTY_PORT);
 280           break;
 281         case 'u':
 282           isisd_privs.user = optarg;
 283           break;
 284         case 'g':
 285           isisd_privs.group = optarg;
 286           break;
 287         case 'v':
 288           printf ("ISISd version %s\n", ISISD_VERSION);
 289           printf ("Copyright (c) 2001-2002 Sampo Saaristo,"
 290                   " Ofer Wald and Hannes Gredler\n");
 291           print_version ("Zebra");
 292           exit (0);
 293           break;
 294         case 'C':
 295           dryrun = 1;
 296           break;
 297         case 'h':
 298           usage (0);
 299           break;
 300         default:
 301           usage (1);
 302           break;
 303         }
 304     }
 305
 306   /* thread master */
 307   master = thread_master_create ();
 308
 309   /* random seed from time */
 310   srand (time (NULL));
 311
 312   /*
 313    *  initializations
 314    */
 315   zprivs_init (&isisd_privs);
 316   signal_init (master, Q_SIGC (isisd_signals), isisd_signals);
 317   cmd_init (1);
 318   vty_init (master);
 319   memory_init ();
 320   access_list_init();
 321   isis_init ();
 322   dyn_cache_init ();
 323   sort_node ();
 324
 325   /* parse config file */
 326   /* this is needed three times! because we have interfaces before the areas */
 327   vty_read_config (config_file, config_default);
 328   vty_read_config (config_file, config_default);
 329   vty_read_config (config_file, config_default);
 330
 331   /* Start execution only if not in dry-run mode */
 332   if (dryrun)
 333     return(0);
 334
 335   /* demonize */
 336   if (daemon_mode && daemon (0, 0) < 0)
 337     {
 338       zlog_err("ISISd daemon failed: %s", strerror(errno));
 339       exit (1);
 340     }
 341
 342   /* Process ID file creation. */
 343   pid_output (pid_file);
 344
 345   /* Make isis vty socket. */
 346   vty_serv_sock (vty_addr, vty_port, ISIS_VTYSH_PATH);
 347
 348   /* Print banner. */
 349   zlog_notice ("Quagga-ISISd %s starting: vty@%d", QUAGGA_VERSION, vty_port);
 350
 351   /* Start finite state machine. */
 352   while (thread_fetch (master, &thread))
 353     thread_call (&thread);
 354
 355   /* Not reached. */
 356   exit (0);
 357 }