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 "plist.h"
  38 #include "zclient.h"
  39 #include "vrf.h"
  40
  41 #include "isisd/dict.h"
  42 #include "include-netbsd/iso.h"
  43 #include "isisd/isis_constants.h"
  44 #include "isisd/isis_common.h"
  45 #include "isisd/isis_flags.h"
  46 #include "isisd/isis_circuit.h"
  47 #include "isisd/isisd.h"
  48 #include "isisd/isis_dynhn.h"
  49 #include "isisd/isis_spf.h"
  50 #include "isisd/isis_route.h"
  51 #include "isisd/isis_routemap.h"
  52 #include "isisd/isis_zebra.h"
  53 #include "isisd/isis_tlv.h"
  54 #include "isisd/isis_te.h"
  55
  56 /* Default configuration file name */
  57 #define ISISD_DEFAULT_CONFIG "isisd.conf"
  58 /* Default vty port */
  59 #define ISISD_VTY_PORT       2608
  60
  61 /* isisd privileges */
  62 zebra_capabilities_t _caps_p[] = {
  63   ZCAP_NET_RAW,
  64   ZCAP_BIND
  65 };
  66
  67 struct zebra_privs_t isisd_privs = {
  68 #if defined(QUAGGA_USER)
  69   .user = QUAGGA_USER,
  70 #endif
  71 #if defined QUAGGA_GROUP
  72   .group = QUAGGA_GROUP,
  73 #endif
  74 #ifdef VTY_GROUP
  75   .vty_group = VTY_GROUP,
  76 #endif
  77   .caps_p = _caps_p,
  78   .cap_num_p = sizeof (_caps_p) / sizeof (*_caps_p),
  79   .cap_num_i = 0
  80 };
  81
  82 /* isisd options */
  83 struct option longopts[] = {
  84   {"daemon",      no_argument,       NULL, 'd'},
  85   {"config_file", required_argument, NULL, 'f'},
  86   {"pid_file",    required_argument, NULL, 'i'},
  87   {"socket",      required_argument, NULL, 'z'},
  88   {"vty_addr",    required_argument, NULL, 'A'},
  89   {"vty_port",    required_argument, NULL, 'P'},
  90   {"user",        required_argument, NULL, 'u'},
  91   {"group",       required_argument, NULL, 'g'},
  92   {"version",     no_argument,       NULL, 'v'},
  93   {"dryrun",      no_argument,       NULL, 'C'},
  94   {"help",        no_argument,       NULL, 'h'},
  95   {0}
  96 };
  97
  98 /* Configuration file and directory. */
  99 char config_default[] = SYSCONFDIR ISISD_DEFAULT_CONFIG;
 100 char *config_file = NULL;
 101
 102 /* isisd program name. */
 103 char *progname;
 104
 105 int daemon_mode = 0;
 106
 107 /* Master of threads. */
 108 struct thread_master *master;
 109
 110 /* Process ID saved for use by init system */
 111 const char *pid_file = PATH_ISISD_PID;
 112
 113 /* for reload */
 114 char _cwd[MAXPATHLEN];
 115 char _progpath[MAXPATHLEN];
 116 int _argc;
 117 char **_argv;
 118 char **_envp;
 119
 120 /*
 121  * Prototypes.
 122  */
 123 void reload(void);
 124 void sighup(void);
 125 void sigint(void);
 126 void sigterm(void);
 127 void sigusr1(void);
 128
 129
 130 /* Help information display. */
 131 static void
 132 usage (int status)
 133 {
 134   if (status != 0)
 135     fprintf (stderr, "Try `%s --help' for more information.\n", progname);
 136   else
 137     {
 138       printf ("Usage : %s [OPTION...]\n\n\
 139 Daemon which manages IS-IS routing\n\n\
 140 -d, --daemon       Runs in daemon mode\n\
 141 -f, --config_file  Set configuration file name\n\
 142 -i, --pid_file     Set process identifier file name\n\
 143 -z, --socket       Set path of zebra socket\n\
 144 -A, --vty_addr     Set vty's bind address\n\
 145 -P, --vty_port     Set vty's port number\n\
 146 -u, --user         User to run as\n\
 147 -g, --group        Group to run as\n\
 148 -v, --version      Print program version\n\
 149 -C, --dryrun       Check configuration for validity and exit\n\
 150 -h, --help         Display this help and exit\n\
 151 \n\
 152 Report bugs to %s\n", progname, ZEBRA_BUG_ADDRESS);
 153     }
 154
 155   exit (status);
 156 }
 157
 158
 159 void
 160 reload ()
 161 {
 162   zlog_debug ("Reload");
 163   /* FIXME: Clean up func call here */
 164   vty_reset ();
 165   (void) isisd_privs.change (ZPRIVS_RAISE);
 166   execve (_progpath, _argv, _envp);
 167   zlog_err ("Reload failed: cannot exec %s: %s", _progpath,
 168       safe_strerror (errno));
 169 }
 170
 171 static __attribute__((__noreturn__)) void
 172 terminate (int i)
 173 {
 174   exit (i);
 175 }
 176
 177 /*
 178  * Signal handlers
 179  */
 180
 181 void
 182 sighup (void)
 183 {
 184   zlog_debug ("SIGHUP received");
 185   reload ();
 186
 187   return;
 188 }
 189
 190 __attribute__((__noreturn__)) void
 191 sigint (void)
 192 {
 193   zlog_notice ("Terminating on signal SIGINT");
 194   terminate (0);
 195 }
 196
 197 __attribute__((__noreturn__)) void
 198 sigterm (void)
 199 {
 200   zlog_notice ("Terminating on signal SIGTERM");
 201   terminate (0);
 202 }
 203
 204 void
 205 sigusr1 (void)
 206 {
 207   zlog_debug ("SIGUSR1 received");
 208   zlog_rotate (NULL);
 209 }
 210
 211 struct quagga_signal_t isisd_signals[] =
 212 {
 213   {
 214    .signal = SIGHUP,
 215    .handler = &sighup,
 216    },
 217   {
 218    .signal = SIGUSR1,
 219    .handler = &sigusr1,
 220    },
 221   {
 222    .signal = SIGINT,
 223    .handler = &sigint,
 224    },
 225   {
 226    .signal = SIGTERM,
 227    .handler = &sigterm,
 228    },
 229 };
 230
 231 /*
 232  * Main routine of isisd. Parse arguments and handle IS-IS state machine.
 233  */
 234 int
 235 main (int argc, char **argv, char **envp)
 236 {
 237   char *p;
 238   int opt, vty_port = ISISD_VTY_PORT;
 239   struct thread thread;
 240   char *config_file = NULL;
 241   char *vty_addr = NULL;
 242   int dryrun = 0;
 243
 244   /* Get the programname without the preceding path. */
 245   progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);
 246
 247   zlog_default = openzlog (progname, ZLOG_ISIS, 0,
 248                            LOG_CONS | LOG_NDELAY | LOG_PID, LOG_DAEMON);
 249   zprivs_init (&isisd_privs);
 250 #if defined(HAVE_CUMULUS)
 251   zlog_set_level (NULL, ZLOG_DEST_SYSLOG, zlog_default->default_lvl);
 252 #endif
 253
 254   /* for reload */
 255   _argc = argc;
 256   _argv = argv;
 257   _envp = envp;
 258   if (getcwd (_cwd, sizeof (_cwd)) == NULL)
 259     {
 260       zlog_err ("ISISd: Unable to determine CWD: %d", errno);
 261       exit (1);
 262     }
 263
 264   if (*argv[0] == '.')
 265     snprintf (_progpath, sizeof (_progpath), "%s/%s", _cwd, _argv[0]);
 266   else
 267     snprintf (_progpath, sizeof (_progpath), "%s", argv[0]);
 268
 269   /* Command line argument treatment. */
 270   while (1)
 271     {
 272       opt = getopt_long (argc, argv, "df:i:z:hA:p:P:u:g:vC", longopts, 0);
 273
 274       if (opt == EOF)
 275         break;
 276
 277       switch (opt)
 278         {
 279         case 0:
 280           break;
 281         case 'd':
 282           daemon_mode = 1;
 283           break;
 284         case 'f':
 285           config_file = optarg;
 286           break;
 287         case 'i':
 288           pid_file = optarg;
 289           break;
 290         case 'z':
 291           zclient_serv_path_set (optarg);
 292           break;
 293         case 'A':
 294           vty_addr = optarg;
 295           break;
 296         case 'P':
 297           /* Deal with atoi() returning 0 on failure, and isisd not
 298              listening on isisd port... */
 299           if (strcmp (optarg, "0") == 0)
 300             {
 301               vty_port = 0;
 302               break;
 303             }
 304           vty_port = atoi (optarg);
 305           vty_port = (vty_port ? vty_port : ISISD_VTY_PORT);
 306           break;
 307         case 'u':
 308           isisd_privs.user = optarg;
 309           break;
 310         case 'g':
 311           isisd_privs.group = optarg;
 312           break;
 313         case 'v':
 314           printf ("ISISd version %s\n", ISISD_VERSION);
 315           printf ("Copyright (c) 2001-2002 Sampo Saaristo,"
 316                   " Ofer Wald and Hannes Gredler\n");
 317           print_version ("Zebra");
 318           exit (0);
 319           break;
 320         case 'C':
 321           dryrun = 1;
 322           break;
 323         case 'h':
 324           usage (0);
 325           break;
 326         default:
 327           usage (1);
 328           break;
 329         }
 330     }
 331
 332   /* thread master */
 333   master = thread_master_create ();
 334
 335   /* random seed from time */
 336   srandom (time (NULL));
 337
 338   /*
 339    *  initializations
 340    */
 341   signal_init (master, array_size (isisd_signals), isisd_signals);
 342   cmd_init (1);
 343   vty_init (master);
 344   memory_init ();
 345   access_list_init();
 346   vrf_init ();
 347   prefix_list_init();
 348   isis_init ();
 349   isis_circuit_init ();
 350   isis_spf_cmds_init ();
 351   isis_redist_init ();
 352   isis_route_map_init();
 353   isis_mpls_te_init();
 354
 355   /* create the global 'isis' instance */
 356   isis_new (1);
 357
 358   isis_zebra_init(master);
 359
 360   /* parse config file */
 361   /* this is needed three times! because we have interfaces before the areas */
 362   vty_read_config (config_file, config_default);
 363
 364   /* Start execution only if not in dry-run mode */
 365   if (dryrun)
 366     return(0);
 367
 368   /* demonize */
 369   if (daemon_mode && daemon (0, 0) < 0)
 370     {
 371       zlog_err("ISISd daemon failed: %s", strerror(errno));
 372       return (1);
 373     }
 374
 375   /* Process ID file creation. */
 376   if (pid_file[0] != '\0')
 377     pid_output (pid_file);
 378
 379   /* Make isis vty socket. */
 380   vty_serv_sock (vty_addr, vty_port, ISIS_VTYSH_PATH);
 381
 382   /* Print banner. */
 383   zlog_notice ("Quagga-ISISd %s starting: vty@%d", QUAGGA_VERSION, vty_port);
 384
 385   /* Start finite state machine. */
 386   while (thread_fetch (master, &thread))
 387     thread_call (&thread);
 388
 389   /* Not reached. */
 390   exit (0);
 391 }