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 #include "zclient.h"
  38
  39 #include "isisd/dict.h"
  40 #include "include-netbsd/iso.h"
  41 #include "isisd/isis_constants.h"
  42 #include "isisd/isis_common.h"
  43 #include "isisd/isis_flags.h"
  44 #include "isisd/isis_circuit.h"
  45 #include "isisd/isisd.h"
  46 #include "isisd/isis_dynhn.h"
  47
  48 /* Default configuration file name */
  49 #define ISISD_DEFAULT_CONFIG "isisd.conf"
  50 /* Default vty port */
  51 #define ISISD_VTY_PORT       2608
  52
  53 /* isisd privileges */
  54 zebra_capabilities_t _caps_p[] = {
  55   ZCAP_NET_RAW,
  56   ZCAP_BIND
  57 };
  58
  59 struct zebra_privs_t isisd_privs = {
  60 #if defined(QUAGGA_USER)
  61   .user = QUAGGA_USER,
  62 #endif
  63 #if defined QUAGGA_GROUP
  64   .group = QUAGGA_GROUP,
  65 #endif
  66 #ifdef VTY_GROUP
  67   .vty_group = VTY_GROUP,
  68 #endif
  69   .caps_p = _caps_p,
  70   .cap_num_p = 2,
  71   .cap_num_i = 0
  72 };
  73
  74 /* isisd options */
  75 struct option longopts[] = {
  76   {"daemon",      no_argument,       NULL, 'd'},
  77   {"config_file", required_argument, NULL, 'f'},
  78   {"pid_file",    required_argument, NULL, 'i'},
  79   {"socket",      required_argument, NULL, 'z'},
  80   {"vty_addr",    required_argument, NULL, 'A'},
  81   {"vty_port",    required_argument, NULL, 'P'},
  82   {"user",        required_argument, NULL, 'u'},
  83   {"group",       required_argument, NULL, 'g'},
  84   {"version",     no_argument,       NULL, 'v'},
  85   {"dryrun",      no_argument,       NULL, 'C'},
  86   {"help",        no_argument,       NULL, 'h'},
  87   {0}
  88 };
  89
  90 /* Configuration file and directory. */
  91 char config_default[] = SYSCONFDIR ISISD_DEFAULT_CONFIG;
  92 char *config_file = NULL;
  93
  94 /* isisd program name. */
  95 char *progname;
  96
  97 int daemon_mode = 0;
  98
  99 /* Master of threads. */
 100 struct thread_master *master;
 101
 102 /* Process ID saved for use by init system */
 103 const char *pid_file = PATH_ISISD_PID;
 104
 105 /* for reload */
 106 char _cwd[MAXPATHLEN];
 107 char _progpath[MAXPATHLEN];
 108 int _argc;
 109 char **_argv;
 110 char **_envp;
 111
 112 /*
 113  * Prototypes.
 114  */
 115 void reload(void);
 116 void sighup(void);
 117 void sigint(void);
 118 void sigterm(void);
 119 void sigusr1(void);
 120
 121
 122 /* Help information display. */
 123 static void
 124 usage (int status)
 125 {
 126   if (status != 0)
 127     fprintf (stderr, "Try `%s --help' for more information.\n", progname);
 128   else
 129     {
 130       printf ("Usage : %s [OPTION...]\n\n\
 131 Daemon which manages IS-IS routing\n\n\
 132 -d, --daemon       Runs in daemon mode\n\
 133 -f, --config_file  Set configuration file name\n\
 134 -i, --pid_file     Set process identifier file name\n\
 135 -z, --socket       Set path of zebra socket\n\
 136 -A, --vty_addr     Set vty's bind address\n\
 137 -P, --vty_port     Set vty's port number\n\
 138 -u, --user         User to run as\n\
 139 -g, --group        Group to run as\n\
 140 -v, --version      Print program version\n\
 141 -C, --dryrun       Check configuration for validity and exit\n\
 142 -h, --help         Display this help and exit\n\
 143 \n\
 144 Report bugs to http://bugzilla.quagga.net\n", progname);
 145     }
 146
 147   exit (status);
 148 }
 149
 150
 151 void
 152 reload ()
 153 {
 154   zlog_debug ("Reload");
 155   /* FIXME: Clean up func call here */
 156   vty_reset ();
 157   execve (_progpath, _argv, _envp);
 158 }
 159
 160 static void
 161 terminate (int i)
 162 {
 163   exit (i);
 164 }
 165
 166 /*
 167  * Signal handlers
 168  */
 169
 170 void
 171 sighup (void)
 172 {
 173   zlog_debug ("SIGHUP received");
 174   reload ();
 175
 176   return;
 177 }
 178
 179 void
 180 sigint (void)
 181 {
 182   zlog_notice ("Terminating on signal SIGINT");
 183   terminate (0);
 184 }
 185
 186 void
 187 sigterm (void)
 188 {
 189   zlog_notice ("Terminating on signal SIGTERM");
 190   terminate (0);
 191 }
 192
 193 void
 194 sigusr1 (void)
 195 {
 196   zlog_debug ("SIGUSR1 received");
 197   zlog_rotate (NULL);
 198 }
 199
 200 struct quagga_signal_t isisd_signals[] =
 201 {
 202   {
 203    .signal = SIGHUP,
 204    .handler = &sighup,
 205    },
 206   {
 207    .signal = SIGUSR1,
 208    .handler = &sigusr1,
 209    },
 210   {
 211    .signal = SIGINT,
 212    .handler = &sigint,
 213    },
 214   {
 215    .signal = SIGTERM,
 216    .handler = &sigterm,
 217    },
 218 };
 219
 220 /*
 221  * Main routine of isisd. Parse arguments and handle IS-IS state machine.
 222  */
 223 int
 224 main (int argc, char **argv, char **envp)
 225 {
 226   char *p;
 227   int opt, vty_port = ISISD_VTY_PORT;
 228   struct thread thread;
 229   char *config_file = NULL;
 230   char *vty_addr = NULL;
 231   int dryrun = 0;
 232
 233   /* Get the programname without the preceding path. */
 234   progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);
 235
 236   zlog_default = openzlog (progname, ZLOG_ISIS,
 237                            LOG_CONS | LOG_NDELAY | LOG_PID, LOG_DAEMON);
 238
 239   /* for reload */
 240   _argc = argc;
 241   _argv = argv;
 242   _envp = envp;
 243   getcwd (_cwd, sizeof (_cwd));
 244   if (*argv[0] == '.')
 245     snprintf (_progpath, sizeof (_progpath), "%s/%s", _cwd, _argv[0]);
 246   else
 247     snprintf (_progpath, sizeof (_progpath), "%s", argv[0]);
 248
 249   /* Command line argument treatment. */
 250   while (1)
 251     {
 252       opt = getopt_long (argc, argv, "df:i:z:hA:p:P:u:g:vC", longopts, 0);
 253
 254       if (opt == EOF)
 255         break;
 256
 257       switch (opt)
 258         {
 259         case 0:
 260           break;
 261         case 'd':
 262           daemon_mode = 1;
 263           break;
 264         case 'f':
 265           config_file = optarg;
 266           break;
 267         case 'i':
 268           pid_file = optarg;
 269           break;
 270         case 'z':
 271           zclient_serv_path_set (optarg);
 272           break;
 273         case 'A':
 274           vty_addr = optarg;
 275           break;
 276         case 'P':
 277           /* Deal with atoi() returning 0 on failure, and isisd not
 278              listening on isisd port... */
 279           if (strcmp (optarg, "0") == 0)
 280             {
 281               vty_port = 0;
 282               break;
 283             }
 284           vty_port = atoi (optarg);
 285           vty_port = (vty_port ? vty_port : ISISD_VTY_PORT);
 286           break;
 287         case 'u':
 288           isisd_privs.user = optarg;
 289           break;
 290         case 'g':
 291           isisd_privs.group = optarg;
 292           break;
 293         case 'v':
 294           printf ("ISISd version %s\n", ISISD_VERSION);
 295           printf ("Copyright (c) 2001-2002 Sampo Saaristo,"
 296                   " Ofer Wald and Hannes Gredler\n");
 297           print_version ("Zebra");
 298           exit (0);
 299           break;
 300         case 'C':
 301           dryrun = 1;
 302           break;
 303         case 'h':
 304           usage (0);
 305           break;
 306         default:
 307           usage (1);
 308           break;
 309         }
 310     }
 311
 312   /* thread master */
 313   master = thread_master_create ();
 314
 315   /* random seed from time */
 316   srand (time (NULL));
 317
 318   /*
 319    *  initializations
 320    */
 321   zprivs_init (&isisd_privs);
 322   signal_init (master, Q_SIGC (isisd_signals), isisd_signals);
 323   cmd_init (1);
 324   vty_init (master);
 325   memory_init ();
 326   access_list_init();
 327   isis_init ();
 328   dyn_cache_init ();
 329   sort_node ();
 330
 331   /* parse config file */
 332   /* this is needed three times! because we have interfaces before the areas */
 333   vty_read_config (config_file, config_default);
 334   vty_read_config (config_file, config_default);
 335   vty_read_config (config_file, config_default);
 336
 337   /* Start execution only if not in dry-run mode */
 338   if (dryrun)
 339     return(0);
 340
 341   /* demonize */
 342   if (daemon_mode && daemon (0, 0) < 0)
 343     {
 344       zlog_err("ISISd daemon failed: %s", strerror(errno));
 345       exit (1);
 346     }
 347
 348   /* Process ID file creation. */
 349   pid_output (pid_file);
 350
 351   /* Make isis vty socket. */
 352   vty_serv_sock (vty_addr, vty_port, ISIS_VTYSH_PATH);
 353
 354   /* Print banner. */
 355   zlog_notice ("Quagga-ISISd %s starting: vty@%d", QUAGGA_VERSION, vty_port);
 356
 357   /* Start finite state machine. */
 358   while (thread_fetch (master, &thread))
 359     thread_call (&thread);
 360
 361   /* Not reached. */
 362   exit (0);
 363 }