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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 <lib/version.h>
- #include "memory.h"
- #include "prefix.h"
- #include "log.h"
- #include "privs.h"
- #include "sigevent.h"
- #include "zclient.h"
- #include "routemap.h"
- #include "filter.h"
- #include "plist.h"
- #include "stream.h"
- #include "vrf.h"
- #include "workqueue.h"
- #include "bgpd/bgpd.h"
- #include "bgpd/bgp_attr.h"
- #include "bgpd/bgp_mplsvpn.h"
- #include "bgpd/bgp_aspath.h"
- #include "bgpd/bgp_dump.h"
- #include "bgpd/bgp_route.h"
- #include "bgpd/bgp_nexthop.h"
- #include "bgpd/bgp_regex.h"
- #include "bgpd/bgp_clist.h"
- #include "bgpd/bgp_debug.h"
- #include "bgpd/bgp_filter.h"
- #include "bgpd/bgp_zebra.h"
- /* bgpd options, we use GNU getopt library. */
- static const struct option longopts[] =
- {
- { "daemon", no_argument, NULL, 'd'},
- { "config_file", required_argument, NULL, 'f'},
- { "pid_file", required_argument, NULL, 'i'},
- { "socket", required_argument, NULL, 'z'},
- { "bgp_port", required_argument, NULL, 'p'},
- { "listenon", required_argument, NULL, 'l'},
- { "vty_addr", required_argument, NULL, 'A'},
- { "vty_port", required_argument, NULL, 'P'},
- { "retain", no_argument, NULL, 'r'},
- { "no_kernel", no_argument, NULL, 'n'},
- { "user", required_argument, NULL, 'u'},
- { "group", required_argument, NULL, 'g'},
- { "skip_runas", no_argument, NULL, 'S'},
- { "version", no_argument, NULL, 'v'},
- { "dryrun", no_argument, NULL, 'C'},
- { "help", no_argument, NULL, 'h'},
- { 0 }
- };
- /* signal definitions */
- void sighup (void);
- void sigint (void);
- void sigusr1 (void);
- static void bgp_exit (int);
- static struct quagga_signal_t bgp_signals[] =
- {
- {
- .signal = SIGHUP,
- .handler = &sighup,
- },
- {
- .signal = SIGUSR1,
- .handler = &sigusr1,
- },
- {
- .signal = SIGINT,
- .handler = &sigint,
- },
- {
- .signal = SIGTERM,
- .handler = &sigint,
- },
- };
- /* Configuration file and directory. */
- char config_default[] = SYSCONFDIR BGP_DEFAULT_CONFIG;
- /* Route retain mode flag. */
- static int retain_mode = 0;
- /* Manually specified configuration file name. */
- char *config_file = NULL;
- /* Process ID saved for use by init system */
- static const char *pid_file = PATH_BGPD_PID;
- /* VTY port number and address. */
- int vty_port = BGP_VTY_PORT;
- char *vty_addr = NULL;
- /* privileges */
- static zebra_capabilities_t _caps_p [] =
- {
- ZCAP_BIND,
- ZCAP_NET_RAW,
- ZCAP_NET_ADMIN,
- };
- struct zebra_privs_t bgpd_privs =
- {
- #if defined(QUAGGA_USER) && defined(QUAGGA_GROUP)
- .user = QUAGGA_USER,
- .group = QUAGGA_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,
- };
- /* 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...]\n\n\
- Daemon which manages kernel routing table management and \
- redistribution between different routing protocols.\n\n\
- -d, --daemon Runs in daemon mode\n\
- -f, --config_file Set configuration file name\n\
- -i, --pid_file Set process identifier file name\n\
- -z, --socket Set path of zebra socket\n\
- -p, --bgp_port Set bgp protocol's port number\n\
- -l, --listenon Listen on specified address (implies -n)\n\
- -A, --vty_addr Set vty's bind address\n\
- -P, --vty_port Set vty's port number\n\
- -r, --retain When program terminates, retain added route by bgpd.\n\
- -n, --no_kernel Do not install route to kernel.\n\
- -u, --user User to run as\n\
- -g, --group Group to run as\n\
- -S, --skip_runas Skip user and group run as\n\
- -v, --version Print program version\n\
- -C, --dryrun Check configuration for validity and exit\n\
- -h, --help Display this help and exit\n\
- \n\
- Report bugs to %s\n", progname, ZEBRA_BUG_ADDRESS);
- }
- exit (status);
- }
- /* SIGHUP handler. */
- void
- sighup (void)
- {
- 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_default);
- /* Create VTY's socket */
- vty_serv_sock (vty_addr, vty_port, BGP_VTYSH_PATH);
- /* Try to return to normal operation. */
- }
- /* SIGINT handler. */
- void
- sigint (void)
- {
- zlog_notice ("Terminating on signal");
- if (! retain_mode)
- {
- bgp_terminate ();
- if (bgpd_privs.user) /* NULL if skip_runas flag set */
- zprivs_terminate (&bgpd_privs);
- }
- bgp_exit (0);
- }
- /* SIGUSR1 handler. */
- void
- sigusr1 (void)
- {
- zlog_rotate (NULL);
- }
- /*
- Try to free up allocations we know about so that diagnostic tools such as
- valgrind are able to better illuminate leaks.
- Zebra route removal and protocol teardown are not meant to be done here.
- For example, "retain_mode" may be set.
- */
- static void
- bgp_exit (int status)
- {
- struct bgp *bgp;
- struct listnode *node, *nnode;
- int *socket;
- struct interface *ifp;
- /* it only makes sense for this to be called on a clean exit */
- assert (status == 0);
- /* reverse bgp_master_init */
- for (ALL_LIST_ELEMENTS (bm->bgp, node, nnode, bgp))
- bgp_delete (bgp);
- list_free (bm->bgp);
- bm->bgp = NULL;
-
- /*
- * bgp_delete can re-allocate the process queues after they were
- * deleted in bgp_terminate. delete them again.
- *
- * It might be better to ensure the RIBs (including static routes)
- * are cleared by bgp_terminate() during its call to bgp_cleanup_routes(),
- * which currently only deletes the kernel routes.
- */
- if (bm->process_main_queue)
- {
- work_queue_free (bm->process_main_queue);
- bm->process_main_queue = NULL;
- }
- if (bm->process_rsclient_queue)
- {
- work_queue_free (bm->process_rsclient_queue);
- bm->process_rsclient_queue = NULL;
- }
-
- /* reverse bgp_master_init */
- for (ALL_LIST_ELEMENTS_RO(bm->listen_sockets, node, socket))
- {
- if (close ((int)(long)socket) == -1)
- zlog_err ("close (%d): %s", (int)(long)socket, safe_strerror (errno));
- }
- list_delete (bm->listen_sockets);
- /* reverse bgp_zebra_init/if_init */
- if (retain_mode)
- if_add_hook (IF_DELETE_HOOK, NULL);
- for (ALL_LIST_ELEMENTS_RO (iflist, node, ifp))
- {
- struct listnode *c_node, *c_nnode;
- struct connected *c;
- for (ALL_LIST_ELEMENTS (ifp->connected, c_node, c_nnode, c))
- bgp_connected_delete (c);
- }
- /* reverse bgp_attr_init */
- bgp_attr_finish ();
- /* reverse bgp_dump_init */
- bgp_dump_finish ();
- /* reverse bgp_route_init */
- bgp_route_finish ();
- /* reverse bgp_route_map_init/route_map_init */
- route_map_finish ();
- /* reverse access_list_init */
- access_list_add_hook (NULL);
- access_list_delete_hook (NULL);
- access_list_reset ();
- /* reverse bgp_filter_init */
- as_list_add_hook (NULL);
- as_list_delete_hook (NULL);
- bgp_filter_reset ();
- /* reverse prefix_list_init */
- prefix_list_add_hook (NULL);
- prefix_list_delete_hook (NULL);
- prefix_list_reset ();
- /* reverse community_list_init */
- community_list_terminate (bgp_clist);
- vrf_terminate ();
- cmd_terminate ();
- vty_terminate ();
- bgp_address_destroy();
- bgp_scan_destroy();
- bgp_zebra_destroy();
- if (bgp_nexthop_buf)
- stream_free (bgp_nexthop_buf);
- if (bgp_ifindices_buf)
- stream_free (bgp_ifindices_buf);
- /* reverse bgp_scan_init */
- bgp_scan_finish ();
- /* reverse bgp_master_init */
- if (bm->master)
- thread_master_free (bm->master);
- if (zlog_default)
- closezlog (zlog_default);
- if (CONF_BGP_DEBUG (normal, NORMAL))
- log_memstats_stderr ("bgpd");
- exit (status);
- }
- /* 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;
- int dryrun = 0;
- char *progname;
- int tmp_port;
- int skip_runas = 0;
- /* 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_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:i:z:hp:l:A:P:rnu:g:vCS", 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 'z':
- zclient_serv_path_set (optarg);
- break;
- case 'p':
- tmp_port = atoi (optarg);
- if (tmp_port <= 0 || tmp_port > 0xffff)
- bm->port = BGP_PORT_DEFAULT;
- else
- bm->port = tmp_port;
- break;
- case 'A':
- vty_addr = optarg;
- break;
- case 'P':
- /* Deal with atoi() returning 0 on failure, and bgpd not
- listening on bgp port... */
- if (strcmp(optarg, "0") == 0)
- {
- vty_port = 0;
- break;
- }
- vty_port = atoi (optarg);
- if (vty_port <= 0 || vty_port > 0xffff)
- vty_port = BGP_VTY_PORT;
- break;
- case 'r':
- retain_mode = 1;
- break;
- case 'l':
- bm->address = optarg;
- /* listenon implies -n */
- case 'n':
- bgp_option_set (BGP_OPT_NO_FIB);
- break;
- case 'u':
- bgpd_privs.user = optarg;
- break;
- case 'g':
- bgpd_privs.group = optarg;
- break;
- case 'S': /* skip run as = override bgpd_privs */
- skip_runas = 1;
- break;
- case 'v':
- print_version (progname);
- exit (0);
- break;
- case 'C':
- dryrun = 1;
- break;
- case 'h':
- usage (progname, 0);
- break;
- default:
- usage (progname, 1);
- break;
- }
- }
- /* Initializations. */
- srandom (time (NULL));
- signal_init (bm->master, array_size(bgp_signals), bgp_signals);
- if (skip_runas)
- memset (&bgpd_privs, 0, sizeof (bgpd_privs));
- zprivs_init (&bgpd_privs);
- cmd_init (1);
- vty_init (bm->master);
- memory_init ();
- vrf_init ();
- /* BGP related initialization. */
- bgp_init ();
- /* Parse config file. */
- vty_read_config (config_file, config_default);
- /* Start execution only if not in dry-run mode */
- if(dryrun)
- return(0);
-
- /* Turn into daemon if daemon_mode is set. */
- if (daemon_mode && daemon (0, 0) < 0)
- {
- zlog_err("BGPd daemon failed: %s", strerror(errno));
- return (1);
- }
- /* 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_notice ("BGPd %s starting: vty@%d, bgp@%s:%d pid %d", QUAGGA_VERSION,
- vty_port,
- (bm->address ? bm->address : "<all>"),
- bm->port,
- getpid ());
- /* Start finite state machine, here we go! */
- thread_main (bm->master);
- /* Not reached. */
- return (0);
- }
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