Annotation of embedaddon/quagga/bgpd/bgp_main.c, revision 1.1.1.1
1.1 misho 1: /* Main routine of bgpd.
2: Copyright (C) 1996, 97, 98, 1999 Kunihiro Ishiguro
3:
4: This file is part of GNU Zebra.
5:
6: GNU Zebra is free software; you can redistribute it and/or modify it
7: under the terms of the GNU General Public License as published by the
8: Free Software Foundation; either version 2, or (at your option) any
9: later version.
10:
11: GNU Zebra is distributed in the hope that it will be useful, but
12: WITHOUT ANY WARRANTY; without even the implied warranty of
13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: General Public License for more details.
15:
16: You should have received a copy of the GNU General Public License
17: along with GNU Zebra; see the file COPYING. If not, write to the Free
18: Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
19: 02111-1307, USA. */
20:
21: #include <zebra.h>
22:
23: #include "vector.h"
24: #include "vty.h"
25: #include "command.h"
26: #include "getopt.h"
27: #include "thread.h"
28: #include <lib/version.h>
29: #include "memory.h"
30: #include "prefix.h"
31: #include "log.h"
32: #include "privs.h"
33: #include "sigevent.h"
34: #include "zclient.h"
35: #include "routemap.h"
36: #include "filter.h"
37: #include "plist.h"
38:
39: #include "bgpd/bgpd.h"
40: #include "bgpd/bgp_attr.h"
41: #include "bgpd/bgp_mplsvpn.h"
42: #include "bgpd/bgp_aspath.h"
43: #include "bgpd/bgp_dump.h"
44: #include "bgpd/bgp_route.h"
45: #include "bgpd/bgp_nexthop.h"
46: #include "bgpd/bgp_regex.h"
47: #include "bgpd/bgp_clist.h"
48: #include "bgpd/bgp_debug.h"
49: #include "bgpd/bgp_filter.h"
50:
51: /* bgpd options, we use GNU getopt library. */
52: static const struct option longopts[] =
53: {
54: { "daemon", no_argument, NULL, 'd'},
55: { "config_file", required_argument, NULL, 'f'},
56: { "pid_file", required_argument, NULL, 'i'},
57: { "bgp_port", required_argument, NULL, 'p'},
58: { "listenon", required_argument, NULL, 'l'},
59: { "vty_addr", required_argument, NULL, 'A'},
60: { "vty_port", required_argument, NULL, 'P'},
61: { "retain", no_argument, NULL, 'r'},
62: { "no_kernel", no_argument, NULL, 'n'},
63: { "user", required_argument, NULL, 'u'},
64: { "group", required_argument, NULL, 'g'},
65: { "version", no_argument, NULL, 'v'},
66: { "dryrun", no_argument, NULL, 'C'},
67: { "help", no_argument, NULL, 'h'},
68: { 0 }
69: };
70:
71: /* signal definitions */
72: void sighup (void);
73: void sigint (void);
74: void sigusr1 (void);
75:
76: static void bgp_exit (int);
77:
78: static struct quagga_signal_t bgp_signals[] =
79: {
80: {
81: .signal = SIGHUP,
82: .handler = &sighup,
83: },
84: {
85: .signal = SIGUSR1,
86: .handler = &sigusr1,
87: },
88: {
89: .signal = SIGINT,
90: .handler = &sigint,
91: },
92: {
93: .signal = SIGTERM,
94: .handler = &sigint,
95: },
96: };
97:
98: /* Configuration file and directory. */
99: char config_default[] = SYSCONFDIR BGP_DEFAULT_CONFIG;
100:
101: /* Route retain mode flag. */
102: static int retain_mode = 0;
103:
104: /* Master of threads. */
105: struct thread_master *master;
106:
107: /* Manually specified configuration file name. */
108: char *config_file = NULL;
109:
110: /* Process ID saved for use by init system */
111: static const char *pid_file = PATH_BGPD_PID;
112:
113: /* VTY port number and address. */
114: int vty_port = BGP_VTY_PORT;
115: char *vty_addr = NULL;
116:
117: /* privileges */
118: static zebra_capabilities_t _caps_p [] =
119: {
120: ZCAP_BIND,
121: ZCAP_NET_RAW,
122: };
123:
124: struct zebra_privs_t bgpd_privs =
125: {
126: #if defined(QUAGGA_USER) && defined(QUAGGA_GROUP)
127: .user = QUAGGA_USER,
128: .group = QUAGGA_GROUP,
129: #endif
130: #ifdef VTY_GROUP
131: .vty_group = VTY_GROUP,
132: #endif
133: .caps_p = _caps_p,
134: .cap_num_p = sizeof(_caps_p)/sizeof(_caps_p[0]),
135: .cap_num_i = 0,
136: };
137:
138: /* Help information display. */
139: static void
140: usage (char *progname, int status)
141: {
142: if (status != 0)
143: fprintf (stderr, "Try `%s --help' for more information.\n", progname);
144: else
145: {
146: printf ("Usage : %s [OPTION...]\n\n\
147: Daemon which manages kernel routing table management and \
148: redistribution between different routing protocols.\n\n\
149: -d, --daemon Runs in daemon mode\n\
150: -f, --config_file Set configuration file name\n\
151: -i, --pid_file Set process identifier file name\n\
152: -p, --bgp_port Set bgp protocol's port number\n\
153: -l, --listenon Listen on specified address (implies -n)\n\
154: -A, --vty_addr Set vty's bind address\n\
155: -P, --vty_port Set vty's port number\n\
156: -r, --retain When program terminates, retain added route by bgpd.\n\
157: -n, --no_kernel Do not install route to kernel.\n\
158: -u, --user User to run as\n\
159: -g, --group Group to run as\n\
160: -v, --version Print program version\n\
161: -C, --dryrun Check configuration for validity and exit\n\
162: -h, --help Display this help and exit\n\
163: \n\
164: Report bugs to %s\n", progname, ZEBRA_BUG_ADDRESS);
165: }
166:
167: exit (status);
168: }
169:
170: /* SIGHUP handler. */
171: void
172: sighup (void)
173: {
174: zlog (NULL, LOG_INFO, "SIGHUP received");
175:
176: /* Terminate all thread. */
177: bgp_terminate ();
178: bgp_reset ();
179: zlog_info ("bgpd restarting!");
180:
181: /* Reload config file. */
182: vty_read_config (config_file, config_default);
183:
184: /* Create VTY's socket */
185: vty_serv_sock (vty_addr, vty_port, BGP_VTYSH_PATH);
186:
187: /* Try to return to normal operation. */
188: }
189:
190: /* SIGINT handler. */
191: void
192: sigint (void)
193: {
194: zlog_notice ("Terminating on signal");
195:
196: if (! retain_mode)
197: bgp_terminate ();
198:
199: bgp_exit (0);
200: }
201:
202: /* SIGUSR1 handler. */
203: void
204: sigusr1 (void)
205: {
206: zlog_rotate (NULL);
207: }
208:
209: /*
210: Try to free up allocations we know about so that diagnostic tools such as
211: valgrind are able to better illuminate leaks.
212:
213: Zebra route removal and protocol teardown are not meant to be done here.
214: For example, "retain_mode" may be set.
215: */
216: static void
217: bgp_exit (int status)
218: {
219: struct bgp *bgp;
220: struct listnode *node, *nnode;
221: int *socket;
222: struct interface *ifp;
223: extern struct zclient *zclient;
224: extern struct zclient *zlookup;
225:
226: /* it only makes sense for this to be called on a clean exit */
227: assert (status == 0);
228:
229: /* reverse bgp_master_init */
230: for (ALL_LIST_ELEMENTS (bm->bgp, node, nnode, bgp))
231: bgp_delete (bgp);
232: list_free (bm->bgp);
233:
234: /* reverse bgp_master_init */
235: for (ALL_LIST_ELEMENTS_RO(bm->listen_sockets, node, socket))
236: {
237: if (close ((int)(long)socket) == -1)
238: zlog_err ("close (%d): %s", (int)(long)socket, safe_strerror (errno));
239: }
240: list_delete (bm->listen_sockets);
241:
242: /* reverse bgp_zebra_init/if_init */
243: if (retain_mode)
244: if_add_hook (IF_DELETE_HOOK, NULL);
245: for (ALL_LIST_ELEMENTS (iflist, node, nnode, ifp))
246: {
247: struct listnode *c_node, *c_nnode;
248: struct connected *c;
249:
250: for (ALL_LIST_ELEMENTS (ifp->connected, c_node, c_nnode, c))
251: bgp_connected_delete (c);
252:
253: if_delete (ifp);
254: }
255: list_free (iflist);
256:
257: /* reverse bgp_attr_init */
258: bgp_attr_finish ();
259:
260: /* reverse bgp_dump_init */
261: bgp_dump_finish ();
262:
263: /* reverse bgp_route_init */
264: bgp_route_finish ();
265:
266: /* reverse bgp_route_map_init/route_map_init */
267: route_map_finish ();
268:
269: /* reverse bgp_scan_init */
270: bgp_scan_finish ();
271:
272: /* reverse access_list_init */
273: access_list_add_hook (NULL);
274: access_list_delete_hook (NULL);
275: access_list_reset ();
276:
277: /* reverse bgp_filter_init */
278: as_list_add_hook (NULL);
279: as_list_delete_hook (NULL);
280: bgp_filter_reset ();
281:
282: /* reverse prefix_list_init */
283: prefix_list_add_hook (NULL);
284: prefix_list_delete_hook (NULL);
285: prefix_list_reset ();
286:
287: /* reverse community_list_init */
288: community_list_terminate (bgp_clist);
289:
290: cmd_terminate ();
291: vty_terminate ();
292: if (zclient)
293: zclient_free (zclient);
294: if (zlookup)
295: zclient_free (zlookup);
296:
297: /* reverse bgp_master_init */
298: if (master)
299: thread_master_free (master);
300:
301: if (zlog_default)
302: closezlog (zlog_default);
303:
304: if (CONF_BGP_DEBUG (normal, NORMAL))
305: log_memstats_stderr ("bgpd");
306:
307: exit (status);
308: }
309:
310: /* Main routine of bgpd. Treatment of argument and start bgp finite
311: state machine is handled at here. */
312: int
313: main (int argc, char **argv)
314: {
315: char *p;
316: int opt;
317: int daemon_mode = 0;
318: int dryrun = 0;
319: char *progname;
320: struct thread thread;
321: int tmp_port;
322:
323: /* Set umask before anything for security */
324: umask (0027);
325:
326: /* Preserve name of myself. */
327: progname = ((p = strrchr (argv[0], '/')) ? ++p : argv[0]);
328:
329: zlog_default = openzlog (progname, ZLOG_BGP,
330: LOG_CONS|LOG_NDELAY|LOG_PID, LOG_DAEMON);
331:
332: /* BGP master init. */
333: bgp_master_init ();
334:
335: /* Command line argument treatment. */
336: while (1)
337: {
338: opt = getopt_long (argc, argv, "df:i:hp:l:A:P:rnu:g:vC", longopts, 0);
339:
340: if (opt == EOF)
341: break;
342:
343: switch (opt)
344: {
345: case 0:
346: break;
347: case 'd':
348: daemon_mode = 1;
349: break;
350: case 'f':
351: config_file = optarg;
352: break;
353: case 'i':
354: pid_file = optarg;
355: break;
356: case 'p':
357: tmp_port = atoi (optarg);
358: if (tmp_port <= 0 || tmp_port > 0xffff)
359: bm->port = BGP_PORT_DEFAULT;
360: else
361: bm->port = tmp_port;
362: break;
363: case 'A':
364: vty_addr = optarg;
365: break;
366: case 'P':
367: /* Deal with atoi() returning 0 on failure, and bgpd not
368: listening on bgp port... */
369: if (strcmp(optarg, "0") == 0)
370: {
371: vty_port = 0;
372: break;
373: }
374: vty_port = atoi (optarg);
375: if (vty_port <= 0 || vty_port > 0xffff)
376: vty_port = BGP_VTY_PORT;
377: break;
378: case 'r':
379: retain_mode = 1;
380: break;
381: case 'l':
382: bm->address = optarg;
383: /* listenon implies -n */
384: case 'n':
385: bgp_option_set (BGP_OPT_NO_FIB);
386: break;
387: case 'u':
388: bgpd_privs.user = optarg;
389: break;
390: case 'g':
391: bgpd_privs.group = optarg;
392: break;
393: case 'v':
394: print_version (progname);
395: exit (0);
396: break;
397: case 'C':
398: dryrun = 1;
399: break;
400: case 'h':
401: usage (progname, 0);
402: break;
403: default:
404: usage (progname, 1);
405: break;
406: }
407: }
408:
409: /* Make thread master. */
410: master = bm->master;
411:
412: /* Initializations. */
413: srand (time (NULL));
414: signal_init (master, Q_SIGC(bgp_signals), bgp_signals);
415: zprivs_init (&bgpd_privs);
416: cmd_init (1);
417: vty_init (master);
418: memory_init ();
419:
420: /* BGP related initialization. */
421: bgp_init ();
422:
423: /* Sort CLI commands. */
424: sort_node ();
425:
426: /* Parse config file. */
427: vty_read_config (config_file, config_default);
428:
429: /* Start execution only if not in dry-run mode */
430: if(dryrun)
431: return(0);
432:
433: /* Turn into daemon if daemon_mode is set. */
434: if (daemon_mode && daemon (0, 0) < 0)
435: {
436: zlog_err("BGPd daemon failed: %s", strerror(errno));
437: return (1);
438: }
439:
440:
441: /* Process ID file creation. */
442: pid_output (pid_file);
443:
444: /* Make bgp vty socket. */
445: vty_serv_sock (vty_addr, vty_port, BGP_VTYSH_PATH);
446:
447: /* Print banner. */
448: zlog_notice ("BGPd %s starting: vty@%d, bgp@%s:%d", QUAGGA_VERSION,
449: vty_port,
450: (bm->address ? bm->address : "<all>"),
451: bm->port);
452:
453: /* Start finite state machine, here we go! */
454: while (thread_fetch (master, &thread))
455: thread_call (&thread);
456:
457: /* Not reached. */
458: return (0);
459: }
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