bgp_main.c
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上传日期:2009-11-15
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- /* Main routine of bgpd.
- Copyright (C) 1996, 97, 98, 1999 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 "vector.h"
- #include "vty.h"
- #include "command.h"
- #include "getopt.h"
- #include "thread.h"
- #include "version.h"
- #include "memory.h"
- #include "prefix.h"
- #include "log.h"
- #include "bgpd/bgpd.h"
- #include "bgpd/bgp_attr.h"
- #include "bgpd/bgp_mplsvpn.h"
- /* bgpd options, we use GNU getopt library. */
- struct option longopts[] =
- {
- { "daemon", no_argument, NULL, 'd'},
- { "config_file", required_argument, NULL, 'f'},
- { "pid_file", required_argument, NULL, 'i'},
- { "bgp_port", required_argument, NULL, 'p'},
- { "vty_addr", required_argument, NULL, 'A'},
- { "vty_port", required_argument, NULL, 'P'},
- { "retain", no_argument, NULL, 'r'},
- { "no_kernel", no_argument, NULL, 'n'},
- { "version", no_argument, NULL, 'v'},
- { "help", no_argument, NULL, 'h'},
- { 0 }
- };
- /* Configuration file and directory. */
- char config_current[] = BGP_DEFAULT_CONFIG;
- char config_default[] = SYSCONFDIR BGP_DEFAULT_CONFIG;
- /* Route retain mode flag. */
- int retain_mode = 0;
- /* Master of threads. */
- struct thread_master *master;
- /* Manually specified configuration file name. */
- char *config_file = NULL;
- /* Process ID saved for use by init system */
- char *pid_file = PATH_BGPD_PID;
- /* VTY port number and address. */
- int vty_port = BGP_VTY_PORT;
- char *vty_addr = NULL;
- /* Help information display. */
- static void
- usage (char *progname, int status)
- {
- if (status != 0)
- fprintf (stderr, "Try `%s --help' for more information.n", progname);
- else
- {
- printf ("Usage : %s [OPTION...]nn
- Daemon which manages kernel routing table management and
- redistribution between different routing protocols.nn
- -d, --daemon Runs in daemon moden
- -f, --config_file Set configuration file namen
- -i, --pid_file Set process identifier file namen
- -p, --bgp_port Set bgp protocol's port numbern
- -A, --vty_addr Set vty's bind addressn
- -P, --vty_port Set vty's port numbern
- -r, --retain When program terminates, retain added route by bgpd.n
- -n, --no_kernel Do not install route to kernel.n
- -v, --version Print program versionn
- -h, --help Display this help and exitn
- n
- Report bugs to %sn", progname, ZEBRA_BUG_ADDRESS);
- }
- exit (status);
- }
- /* SIGHUP handler. */
- void
- sighup (int sig)
- {
- zlog (NULL, LOG_INFO, "SIGHUP received");
- /* Terminate all thread. */
- bgp_terminate ();
- bgp_reset ();
- zlog_info ("bgpd restarting!");
- /* Reload config file. */
- vty_read_config (config_file, config_current, config_default);
- /* Create VTY's socket */
- vty_serv_sock (vty_addr, vty_port ? vty_port : BGP_VTY_PORT, BGP_VTYSH_PATH);
- /* Try to return to normal operation. */
- }
- /* SIGINT handler. */
- void
- sigint (int sig)
- {
- zlog (NULL, LOG_INFO, "Terminating on signal");
- if (! retain_mode)
- bgp_terminate ();
- exit (0);
- }
- /* SIGUSR1 handler. */
- void
- sigusr1 (int sig)
- {
- zlog_rotate (NULL);
- }
- /* Signale wrapper. */
- RETSIGTYPE *
- signal_set (int signo, void (*func)(int))
- {
- int ret;
- struct sigaction sig;
- struct sigaction osig;
- sig.sa_handler = func;
- sigemptyset (&sig.sa_mask);
- sig.sa_flags = 0;
- #ifdef SA_RESTART
- sig.sa_flags |= SA_RESTART;
- #endif /* SA_RESTART */
- ret = sigaction (signo, &sig, &osig);
- if (ret < 0)
- return (SIG_ERR);
- else
- return (osig.sa_handler);
- }
- /* Initialization of signal handles. */
- void
- signal_init ()
- {
- signal_set (SIGHUP, sighup);
- signal_set (SIGINT, sigint);
- signal_set (SIGTERM, sigint);
- signal_set (SIGPIPE, SIG_IGN);
- signal_set (SIGUSR1, sigusr1);
- }
- /* Main routine of bgpd. Treatment of argument and start bgp finite
- state machine is handled at here. */
- int
- main (int argc, char **argv)
- {
- char *p;
- int opt;
- int daemon_mode = 0;
- char *progname;
- struct thread thread;
- /* Set umask before anything for security */
- umask (0027);
- /* Preserve name of myself. */
- progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);
- zlog_default = openzlog (progname, ZLOG_NOLOG, ZLOG_BGP,
- LOG_CONS|LOG_NDELAY|LOG_PID, LOG_DAEMON);
- /* BGP master init. */
- bgp_master_init ();
- /* Command line argument treatment. */
- while (1)
- {
- opt = getopt_long (argc, argv, "df:hp:A:P:rnv", longopts, 0);
-
- if (opt == EOF)
- break;
- switch (opt)
- {
- case 0:
- break;
- case 'd':
- daemon_mode = 1;
- break;
- case 'f':
- config_file = optarg;
- break;
- case 'i':
- pid_file = optarg;
- break;
- case 'p':
- bm->port = atoi (optarg);
- break;
- case 'A':
- vty_addr = optarg;
- break;
- case 'P':
- vty_port = atoi (optarg);
- break;
- case 'r':
- retain_mode = 1;
- break;
- case 'n':
- bgp_option_set (BGP_OPT_NO_FIB);
- break;
- case 'v':
- print_version (progname);
- exit (0);
- break;
- case 'h':
- usage (progname, 0);
- break;
- default:
- usage (progname, 1);
- break;
- }
- }
- /* Make thread master. */
- master = bm->master;
- /* Initializations. */
- srand (time (NULL));
- signal_init ();
- cmd_init (1);
- vty_init ();
- memory_init ();
- /* BGP related initialization. */
- bgp_init ();
- /* Sort CLI commands. */
- sort_node ();
- /* Parse config file. */
- vty_read_config (config_file, config_current, config_default);
- /* Turn into daemon if daemon_mode is set. */
- if (daemon_mode)
- daemon (0, 0);
- /* Process ID file creation. */
- pid_output (pid_file);
- /* Make bgp vty socket. */
- vty_serv_sock (vty_addr, vty_port, BGP_VTYSH_PATH);
- /* Print banner. */
- zlog_info ("BGPd %s starting: vty@%d, bgp@%d", ZEBRA_BGPD_VERSION,
- vty_port, bm->port);
- /* Start finite state machine, here we go! */
- while (thread_fetch (master, &thread))
- thread_call (&thread);
- /* Not reached. */
- exit (0);
- }