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 "memory_vty.h"
  33 #include "stream.h"
  34 #include "if.h"
  35 #include "privs.h"
  36 #include "sigevent.h"
  37 #include "filter.h"
  38 #include "plist.h"
  39 #include "zclient.h"
  40 #include "vrf.h"
  41 #include "qobj.h"
  42
  43 #include "isisd/dict.h"
  44 #include "isisd/isis_constants.h"
  45 #include "isisd/isis_common.h"
  46 #include "isisd/isis_flags.h"
  47 #include "isisd/isis_circuit.h"
  48 #include "isisd/isisd.h"
  49 #include "isisd/isis_dynhn.h"
  50 #include "isisd/isis_spf.h"
  51 #include "isisd/isis_route.h"
  52 #include "isisd/isis_routemap.h"
  53 #include "isisd/isis_zebra.h"
  54 #include "isisd/isis_tlv.h"
  55 #include "isisd/isis_te.h"
  56
  57 /* Default configuration file name */
  58 #define ISISD_DEFAULT_CONFIG "isisd.conf"
  59 /* Default vty port */
  60 #define ISISD_VTY_PORT       2608
  61
  62 /* isisd privileges */
  63 zebra_capabilities_t _caps_p[] = {
  64   ZCAP_NET_RAW,
  65   ZCAP_BIND
  66 };
  67
  68 struct zebra_privs_t isisd_privs = {
  69 #if defined(QUAGGA_USER)
  70   .user = QUAGGA_USER,
  71 #endif
  72 #if defined QUAGGA_GROUP
  73   .group = QUAGGA_GROUP,
  74 #endif
  75 #ifdef VTY_GROUP
  76   .vty_group = VTY_GROUP,
  77 #endif
  78   .caps_p = _caps_p,
  79   .cap_num_p = sizeof (_caps_p) / sizeof (*_caps_p),
  80   .cap_num_i = 0
  81 };
  82
  83 /* isisd options */
  84 struct option longopts[] = {
  85   {"daemon",      no_argument,       NULL, 'd'},
  86   {"config_file", required_argument, NULL, 'f'},
  87   {"pid_file",    required_argument, NULL, 'i'},
  88   {"socket",      required_argument, NULL, 'z'},
  89   {"vty_addr",    required_argument, NULL, 'A'},
  90   {"vty_port",    required_argument, NULL, 'P'},
  91   {"user",        required_argument, NULL, 'u'},
  92   {"group",       required_argument, NULL, 'g'},
  93   {"version",     no_argument,       NULL, 'v'},
  94   {"dryrun",      no_argument,       NULL, 'C'},
  95   {"help",        no_argument,       NULL, 'h'},
  96   {0}
  97 };
  98
  99 /* Configuration file and directory. */
 100 char config_default[] = SYSCONFDIR ISISD_DEFAULT_CONFIG;
 101 char *config_file = NULL;
 102
 103 /* isisd program name. */
 104 char *progname;
 105
 106 int daemon_mode = 0;
 107
 108 /* Master of threads. */
 109 struct thread_master *master;
 110
 111 /* Process ID saved for use by init system */
 112 const char *pid_file = PATH_ISISD_PID;
 113
 114 /* for reload */
 115 char _cwd[MAXPATHLEN];
 116 char _progpath[MAXPATHLEN];
 117 int _argc;
 118 char **_argv;
 119 char **_envp;
 120
 121 /*
 122  * Prototypes.
 123  */
 124 void reload(void);
 125 void sighup(void);
 126 void sigint(void);
 127 void sigterm(void);
 128 void sigusr1(void);
 129
 130
 131 /* Help information display. */
 132 static void
 133 usage (int status)
 134 {
 135   if (status != 0)
 136     fprintf (stderr, "Try `%s --help' for more information.\n", progname);
 137   else
 138     {
 139       printf ("Usage : %s [OPTION...]\n\n\
 140 Daemon which manages IS-IS routing\n\n\
 141 -d, --daemon       Runs in daemon mode\n\
 142 -f, --config_file  Set configuration file name\n\
 143 -i, --pid_file     Set process identifier file name\n\
 144 -z, --socket       Set path of zebra socket\n\
 145 -A, --vty_addr     Set vty's bind address\n\
 146 -P, --vty_port     Set vty's port number\n\
 147 -u, --user         User to run as\n\
 148 -g, --group        Group to run as\n\
 149 -v, --version      Print program version\n\
 150 -C, --dryrun       Check configuration for validity and exit\n\
 151 -h, --help         Display this help and exit\n\
 152 \n\
 153 Report bugs to %s\n", progname, ZEBRA_BUG_ADDRESS);
 154     }
 155
 156   exit (status);
 157 }
 158
 159
 160 void
 161 reload ()
 162 {
 163   zlog_debug ("Reload");
 164   /* FIXME: Clean up func call here */
 165   vty_reset ();
 166   (void) isisd_privs.change (ZPRIVS_RAISE);
 167   execve (_progpath, _argv, _envp);
 168   zlog_err ("Reload failed: cannot exec %s: %s", _progpath,
 169       safe_strerror (errno));
 170 }
 171
 172 static __attribute__((__noreturn__)) void
 173 terminate (int i)
 174 {
 175   exit (i);
 176 }
 177
 178 /*
 179  * Signal handlers
 180  */
 181
 182 void
 183 sighup (void)
 184 {
 185   zlog_debug ("SIGHUP received");
 186   reload ();
 187
 188   return;
 189 }
 190
 191 __attribute__((__noreturn__)) void
 192 sigint (void)
 193 {
 194   zlog_notice ("Terminating on signal SIGINT");
 195   terminate (0);
 196 }
 197
 198 __attribute__((__noreturn__)) void
 199 sigterm (void)
 200 {
 201   zlog_notice ("Terminating on signal SIGTERM");
 202   terminate (0);
 203 }
 204
 205 void
 206 sigusr1 (void)
 207 {
 208   zlog_debug ("SIGUSR1 received");
 209   zlog_rotate (NULL);
 210 }
 211
 212 struct quagga_signal_t isisd_signals[] =
 213 {
 214   {
 215    .signal = SIGHUP,
 216    .handler = &sighup,
 217    },
 218   {
 219    .signal = SIGUSR1,
 220    .handler = &sigusr1,
 221    },
 222   {
 223    .signal = SIGINT,
 224    .handler = &sigint,
 225    },
 226   {
 227    .signal = SIGTERM,
 228    .handler = &sigterm,
 229    },
 230 };
 231
 232 /*
 233  * Main routine of isisd. Parse arguments and handle IS-IS state machine.
 234  */
 235 int
 236 main (int argc, char **argv, char **envp)
 237 {
 238   char *p;
 239   int opt, vty_port = ISISD_VTY_PORT;
 240   struct thread thread;
 241   char *config_file = NULL;
 242   char *vty_addr = NULL;
 243   int dryrun = 0;
 244
 245   /* Get the programname without the preceding path. */
 246   progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);
 247
 248   zlog_default = openzlog (progname, ZLOG_ISIS, 0,
 249                            LOG_CONS | LOG_NDELAY | LOG_PID, LOG_DAEMON);
 250   zprivs_init (&isisd_privs);
 251 #if defined(HAVE_CUMULUS)
 252   zlog_set_level (NULL, ZLOG_DEST_SYSLOG, zlog_default->default_lvl);
 253 #endif
 254
 255   /* for reload */
 256   _argc = argc;
 257   _argv = argv;
 258   _envp = envp;
 259   if (getcwd (_cwd, sizeof (_cwd)) == NULL)
 260     {
 261       zlog_err ("ISISd: Unable to determine CWD: %d", errno);
 262       exit (1);
 263     }
 264
 265   if (*argv[0] == '.')
 266     snprintf (_progpath, sizeof (_progpath), "%s/%s", _cwd, _argv[0]);
 267   else
 268     snprintf (_progpath, sizeof (_progpath), "%s", argv[0]);
 269
 270   /* Command line argument treatment. */
 271   while (1)
 272     {
 273       opt = getopt_long (argc, argv, "df:i:z:hA:p:P:u:g:vC", longopts, 0);
 274
 275       if (opt == EOF)
 276         break;
 277
 278       switch (opt)
 279         {
 280         case 0:
 281           break;
 282         case 'd':
 283           daemon_mode = 1;
 284           break;
 285         case 'f':
 286           config_file = optarg;
 287           break;
 288         case 'i':
 289           pid_file = optarg;
 290           break;
 291         case 'z':
 292           zclient_serv_path_set (optarg);
 293           break;
 294         case 'A':
 295           vty_addr = optarg;
 296           break;
 297         case 'P':
 298           /* Deal with atoi() returning 0 on failure, and isisd not
 299              listening on isisd port... */
 300           if (strcmp (optarg, "0") == 0)
 301             {
 302               vty_port = 0;
 303               break;
 304             }
 305           vty_port = atoi (optarg);
 306           vty_port = (vty_port ? vty_port : ISISD_VTY_PORT);
 307           break;
 308         case 'u':
 309           isisd_privs.user = optarg;
 310           break;
 311         case 'g':
 312           isisd_privs.group = optarg;
 313           break;
 314         case 'v':
 315           printf ("ISISd version %s\n", ISISD_VERSION);
 316           printf ("Copyright (c) 2001-2002 Sampo Saaristo,"
 317                   " Ofer Wald and Hannes Gredler\n");
 318           print_version ("Zebra");
 319           exit (0);
 320           break;
 321         case 'C':
 322           dryrun = 1;
 323           break;
 324         case 'h':
 325           usage (0);
 326           break;
 327         default:
 328           usage (1);
 329           break;
 330         }
 331     }
 332
 333   /* thread master */
 334   master = thread_master_create ();
 335
 336   /* random seed from time */
 337   srandom (time (NULL));
 338
 339   /*
 340    *  initializations
 341    */
 342   signal_init (master, array_size (isisd_signals), isisd_signals);
 343   cmd_init (1);
 344   vty_config_lockless ();
 345   vty_init (master);
 346   memory_init ();
 347   access_list_init();
 348   vrf_init ();
 349   prefix_list_init();
 350   isis_init ();
 351   isis_circuit_init ();
 352   isis_spf_cmds_init ();
 353   isis_redist_init ();
 354   isis_route_map_init();
 355   isis_mpls_te_init();
 356
 357   /* create the global 'isis' instance */
 358   isis_new (1);
 359
 360   isis_zebra_init(master);
 361
 362   /* parse config file */
 363   /* this is needed three times! because we have interfaces before the areas */
 364   vty_read_config (config_file, config_default);
 365
 366   /* Start execution only if not in dry-run mode */
 367   if (dryrun)
 368     return(0);
 369
 370   /* demonize */
 371   if (daemon_mode && daemon (0, 0) < 0)
 372     {
 373       zlog_err("ISISd daemon failed: %s", strerror(errno));
 374       return (1);
 375     }
 376
 377   /* Process ID file creation. */
 378   if (pid_file[0] != '\0')
 379     pid_output (pid_file);
 380
 381   /* Make isis vty socket. */
 382   vty_serv_sock (vty_addr, vty_port, ISIS_VTYSH_PATH);
 383
 384   /* Print banner. */
 385   zlog_notice ("Quagga-ISISd %s starting: vty@%d", QUAGGA_VERSION, vty_port);
 386
 387   /* Start finite state machine. */
 388   while (thread_fetch (master, &thread))
 389     thread_call (&thread);
 390
 391   /* Not reached. */
 392   exit (0);
 393 }