path: root/zebra/main.c

/* zebra daemon main routine.
 * Copyright (C) 1997, 98 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Zebra; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <zebra.h>

#include <lib/version.h>
#include "getopt.h"
#include "command.h"
#include "thread.h"
#include "filter.h"
#include "memory.h"
#include "zebra_memory.h"
#include "memory_vty.h"
#include "prefix.h"
#include "log.h"
#include "plist.h"
#include "privs.h"
#include "sigevent.h"
#include "vrf.h"
#include "libfrr.h"

#include "zebra/rib.h"
#include "zebra/zserv.h"
#include "zebra/debug.h"
#include "zebra/router-id.h"
#include "zebra/irdp.h"
#include "zebra/rtadv.h"
#include "zebra/zebra_ptm.h"
#include "zebra/zebra_ns.h"
#include "zebra/redistribute.h"
#include "zebra/zebra_mpls.h"
#include "zebra/label_manager.h"

#define ZEBRA_PTM_SUPPORT

/* Zebra instance */
struct zebra_t zebrad =
{
  .rtm_table_default = 0,
};

/* process id. */
pid_t pid;

/* Pacify zclient.o in libfrr, which expects this variable. */
struct thread_master *master;

/* Route retain mode flag. */
int retain_mode = 0;

/* Allow non-quagga entities to delete quagga routes */
int allow_delete = 0;

/* Don't delete kernel route. */
int keep_kernel_mode = 0;

#ifdef HAVE_NETLINK
/* Receive buffer size for netlink socket */
u_int32_t nl_rcvbufsize = 4194304;
#endif /* HAVE_NETLINK */

/* Command line options. */
struct option longopts[] =
{
  { "batch",        no_argument,       NULL, 'b'},
  { "allow_delete", no_argument,       NULL, 'a'},
  { "keep_kernel",  no_argument,       NULL, 'k'},
  { "socket",       required_argument, NULL, 'z'},
  { "ecmp",         required_argument, NULL, 'e'},
  { "label_socket", no_argument,       NULL, 'l'},
  { "retain",       no_argument,       NULL, 'r'},
#ifdef HAVE_NETLINK
  { "nl-bufsize",   required_argument, NULL, 's'},
#endif /* HAVE_NETLINK */
  { 0 }
};

zebra_capabilities_t _caps_p [] =
{
  ZCAP_NET_ADMIN,
  ZCAP_SYS_ADMIN,
  ZCAP_NET_RAW,
};

/* zebra privileges to run with */
struct zebra_privs_t zserv_privs =
{
#if defined(FRR_USER) && defined(FRR_GROUP)
  .user = FRR_USER,
  .group = FRR_GROUP,
#endif
#ifdef VTY_GROUP
  .vty_group = VTY_GROUP,
#endif
  .caps_p = _caps_p,
  .cap_num_p = array_size(_caps_p),
  .cap_num_i = 0
};

unsigned int multipath_num = MULTIPATH_NUM;

/* SIGHUP handler. */
static void
sighup (void)
{
  zlog_info ("SIGHUP received");

  /* Reload of config file. */
  ;
}

/* SIGINT handler. */
static void
sigint (void)
{
  struct vrf *vrf;
  struct zebra_vrf *zvrf;
  struct zebra_ns *zns;

  zlog_notice ("Terminating on signal");

#ifdef HAVE_IRDP
  irdp_finish();
#endif

  zebra_ptm_finish();
  list_delete_all_node (zebrad.client_list);

  if (retain_mode)
    RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name)
      {
	zvrf = vrf->info;
	if (zvrf)
	  SET_FLAG (zvrf->flags, ZEBRA_VRF_RETAIN);
      }
  vrf_terminate ();

  zns = zebra_ns_lookup (NS_DEFAULT);
  zebra_ns_disable (0, (void **)&zns);

  access_list_reset ();
  prefix_list_reset ();
  route_map_finish ();
  cmd_terminate ();
  vty_terminate ();
  zprivs_terminate (&zserv_privs);
  list_delete (zebrad.client_list);
  work_queue_free (zebrad.ribq);
  if (zebrad.lsp_process_q)
    work_queue_free (zebrad.lsp_process_q);
  meta_queue_free (zebrad.mq);
  thread_master_free (zebrad.master);
  closezlog ();

  exit (0);
}

/* SIGUSR1 handler. */
static void
sigusr1 (void)
{
  zlog_rotate();
}

struct quagga_signal_t zebra_signals[] =
{
  {
    .signal = SIGHUP,
    .handler = &sighup,
  },
  {
    .signal = SIGUSR1,
    .handler = &sigusr1,
  },
  {
    .signal = SIGINT,
    .handler = &sigint,
  },
  {
    .signal = SIGTERM,
    .handler = &sigint,
  },
};

FRR_DAEMON_INFO(zebra, ZEBRA,
	.vty_port = ZEBRA_VTY_PORT,
	.flags = FRR_NO_ZCLIENT,

	.proghelp = "Daemon which manages kernel routing table management "
		"and\nredistribution between different routing protocols.",

	.signals = zebra_signals,
	.n_signals = array_size(zebra_signals),

	.privs = &zserv_privs,
)

/* Main startup routine. */
int
main (int argc, char **argv)
{
  // int batch_mode = 0;
  char *zserv_path = NULL;
  /* Socket to external label manager */
  char *lblmgr_path = NULL;

  frr_preinit(&zebra_di, argc, argv);

  frr_opt_add("bakz:e:l:r"
#ifdef HAVE_NETLINK
	"s:"
#endif
	, longopts,
	"  -b, --batch        Runs in batch mode\n"
	"  -a, --allow_delete Allow other processes to delete zebra routes\n"
	"  -z, --socket       Set path of zebra socket\n"
	"  -e, --ecmp         Specify ECMP to use.\n"
	"  -l, --label_socket Socket to external label manager\n"\
	"  -k, --keep_kernel  Don't delete old routes which installed by zebra.\n"
	"  -r, --retain       When program terminates, retain added route by zebra.\n"
#ifdef HAVE_NETLINK
	"  -s, --nl-bufsize   Set netlink receive buffer size\n"
#endif /* HAVE_NETLINK */
	);

  while (1)
    {
      int opt = frr_getopt(argc, argv, NULL);

      if (opt == EOF)
	break;

      switch (opt)
	{
	case 0:
	  break;
	case 'b':
	  // batch_mode = 1;
	  break;
	case 'a':
	  allow_delete = 1;
	  break;
	case 'k':
	  keep_kernel_mode = 1;
	  break;
        case 'e':
          multipath_num = atoi (optarg);
          if (multipath_num > MULTIPATH_NUM || multipath_num <= 0)
            {
              zlog_err ("Multipath Number specified must be less than %d and greater than 0", MULTIPATH_NUM);
              return 1;
            }
          break;
	case 'z':
	  zserv_path = optarg;
	  break;
	case 'l':
	  lblmgr_path = optarg;
	  break;
	case 'r':
	  retain_mode = 1;
	  break;
#ifdef HAVE_NETLINK
	case 's':
	  nl_rcvbufsize = atoi (optarg);
	  break;
#endif /* HAVE_NETLINK */
	default:
	  frr_help_exit (1);
	  break;
	}
    }

  vty_config_lockless ();
  zebrad.master = frr_init();

  /* Zebra related initialize. */
  zebra_init ();
  rib_init ();
  zebra_if_init ();
  zebra_debug_init ();
  router_id_cmd_init ();
  zebra_vty_init ();
  access_list_init ();
  prefix_list_init ();
#if defined (HAVE_RTADV)
  rtadv_cmd_init ();
#endif
#ifdef HAVE_IRDP
  irdp_init();
#endif
  /* PTM socket */
#ifdef ZEBRA_PTM_SUPPORT
  zebra_ptm_init();
#endif

  zebra_mpls_init ();
  zebra_mpls_vty_init ();

  /* For debug purpose. */
  /* SET_FLAG (zebra_debug_event, ZEBRA_DEBUG_EVENT); */

  /* Initialize NS( and implicitly the VRF module), and make kernel routing socket. */
  zebra_ns_init ();

  /* Process the configuration file. Among other configuration
  *  directives we can meet those installing static routes. Such
  *  requests will not be executed immediately, but queued in
  *  zebra->ribq structure until we enter the main execution loop.
  *  The notifications from kernel will show originating PID equal
  *  to that after daemon() completes (if ever called).
  */
  frr_config_fork();

  /* Clean up rib -- before fork (?) */
  /* rib_weed_tables (); */

  /* After we have successfully acquired the pidfile, we can be sure
  *  about being the only copy of zebra process, which is submitting
  *  changes to the FIB.
  *  Clean up zebra-originated routes. The requests will be sent to OS
  *  immediately, so originating PID in notifications from kernel
  *  will be equal to the current getpid(). To know about such routes,
  * we have to have route_read() called before.
  */
  if (! keep_kernel_mode)
    rib_sweep_route ();

  /* Needed for BSD routing socket. */
  pid = getpid ();

  /* This must be done only after locking pidfile (bug #403). */
  zebra_zserv_socket_init (zserv_path);

  /* Init label manager */
  label_manager_init (lblmgr_path);

  frr_run (zebrad.master);

  /* Not reached... */
  return 0;
}