bgpd.c revision 1.34 
1/*	$OpenBSD: bgpd.c,v 1.34 2003/12/26 14:55:03 henning Exp $ */
2
3/*
4 * Copyright (c) 2003 Henning Brauer <henning@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/types.h>
20#include <sys/socket.h>
21#include <sys/wait.h>
22#include <netinet/in.h>
23#include <arpa/inet.h>
24#include <err.h>
25#include <errno.h>
26#include <fcntl.h>
27#include <poll.h>
28#include <signal.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32#include <unistd.h>
33
34#include "mrt.h"
35#include "bgpd.h"
36
37void	sighdlr(int);
38void	usage(void);
39int	main(int, char *[]);
40int	reconfigure(char *, struct bgpd_config *, struct mrt_config *);
41int	dispatch_imsg(struct imsgbuf *, int, struct mrt_config *);
42
43int			mrtfd = -1;
44int			rfd = -1;
45volatile sig_atomic_t	mrtdump = 0;
46volatile sig_atomic_t	quit = 0;
47volatile sig_atomic_t	reconfig = 0;
48struct imsgbuf		ibuf_se;
49struct imsgbuf		ibuf_rde;
50
51void
52sighdlr(int sig)
53{
54	switch (sig) {
55	case SIGTERM:
56	case SIGINT:
57	case SIGCHLD:
58		quit = 1;
59		break;
60	case SIGHUP:
61		reconfig = 1;
62		break;
63	case SIGALRM:
64		mrtdump = 1;
65		break;
66	case SIGUSR1:
67		mrtdump = 2;
68		break;
69	}
70}
71
72void
73usage(void)
74{
75	extern char *__progname;
76
77	fprintf(stderr, "usage: %s [-dnv] ", __progname);
78	fprintf(stderr, "[-D macro=value] [-f file]\n");
79	exit(1);
80}
81
82#define POLL_MAX		8
83#define PFD_PIPE_SESSION	0
84#define PFD_PIPE_ROUTE		1
85#define PFD_SOCK_ROUTE		2
86#define PFD_MRT_START		3
87
88int
89main(int argc, char *argv[])
90{
91	struct bgpd_config	 conf;
92	struct mrt_config	 mrtconf;
93	struct mrtdump_config	*mconf, *(mrt[POLL_MAX]);
94	struct pollfd		 pfd[POLL_MAX];
95	pid_t			 io_pid = 0, rde_pid = 0;
96	char			*conffile;
97	int			 debug = 0;
98	int			 ch, i, j, n, nfds;
99	int			 pipe_m2s[2];
100	int			 pipe_m2r[2];
101	int			 pipe_s2r[2];
102
103	conffile = CONFFILE;
104	bgpd_process = PROC_MAIN;
105
106	log_init(1);		/* log to stderr until daemonized */
107
108	bzero(&conf, sizeof(conf));
109	bzero(&mrtconf, sizeof(mrtconf));
110	LIST_INIT(&mrtconf);
111
112	while ((ch = getopt(argc, argv, "dD:f:nv")) != -1) {
113		switch (ch) {
114		case 'd':
115			debug = 1;
116			break;
117		case 'D':
118			if (cmdline_symset(optarg) < 0)
119				logit(LOG_CRIT,
120				    "could not parse macro definition %s",
121				    optarg);
122			break;
123		case 'f':
124			conffile = optarg;
125			break;
126		case 'n':
127			conf.opts |= BGPD_OPT_NOACTION;
128			break;
129		case 'v':
130			if (conf.opts & BGPD_OPT_VERBOSE)
131				conf.opts |= BGPD_OPT_VERBOSE2;
132			conf.opts |= BGPD_OPT_VERBOSE;
133			break;
134		default:
135			usage();
136			/* NOTREACHED */
137		}
138	}
139
140	if (parse_config(conffile, &conf, &mrtconf))
141		exit(1);
142
143	if (conf.opts & BGPD_OPT_NOACTION) {
144		fprintf(stderr, "configuration OK\n");
145		exit(0);
146	}
147
148	if (geteuid())
149		errx(1, "need root privileges");
150
151	log_init(debug);
152
153	if (!debug)
154		daemon(1, 0);
155
156	logit(LOG_INFO, "startup");
157
158	if (pipe(pipe_m2s) == -1)
159		fatal("pipe", errno);
160	if (fcntl(pipe_m2s[0], F_SETFL, O_NONBLOCK) == -1 ||
161	    fcntl(pipe_m2s[1], F_SETFL, O_NONBLOCK) == -1)
162		fatal("fcntl", errno);
163	if (pipe(pipe_m2r) == -1)
164		fatal("pipe", errno);
165	if (fcntl(pipe_m2r[0], F_SETFL, O_NONBLOCK) == -1 ||
166	    fcntl(pipe_m2r[1], F_SETFL, O_NONBLOCK) == -1)
167		fatal("fcntl", errno);
168	if (pipe(pipe_s2r) == -1)
169		fatal("pipe", errno);
170	if (fcntl(pipe_s2r[0], F_SETFL, O_NONBLOCK) == -1 ||
171	    fcntl(pipe_s2r[1], F_SETFL, O_NONBLOCK) == -1)
172		fatal("fcntl", errno);
173
174	if ((rde_pid = rde_main(&conf, pipe_m2r, pipe_s2r)) < 0)
175		fatal("could not start route decision engine", 0);
176
177	if ((io_pid = session_main(&conf, pipe_m2s, pipe_s2r)) < 0)
178		fatal("could not start session engine", 0);
179
180	setproctitle("parent");
181
182	signal(SIGTERM, sighdlr);
183	signal(SIGINT, sighdlr);
184	signal(SIGCHLD, sighdlr);
185	signal(SIGHUP, sighdlr);
186	signal(SIGALRM, sighdlr);
187	signal(SIGUSR1, sighdlr);
188
189	close(pipe_m2s[1]);
190	close(pipe_m2r[1]);
191	close(pipe_s2r[0]);
192	close(pipe_s2r[1]);
193
194	imsg_init(&ibuf_se, pipe_m2s[0]);
195	imsg_init(&ibuf_rde, pipe_m2r[0]);
196	rfd = kroute_init();
197
198	while (quit == 0) {
199		pfd[PFD_PIPE_SESSION].fd = ibuf_se.sock;
200		pfd[PFD_PIPE_SESSION].events = POLLIN;
201		if (ibuf_se.w.queued)
202			pfd[PFD_PIPE_SESSION].events |= POLLOUT;
203		pfd[PFD_PIPE_ROUTE].fd = ibuf_rde.sock;
204		pfd[PFD_PIPE_ROUTE].events = POLLIN;
205		if (ibuf_rde.w.queued)
206			pfd[PFD_PIPE_ROUTE].events |= POLLOUT;
207		pfd[PFD_SOCK_ROUTE].fd = rfd;
208		pfd[PFD_SOCK_ROUTE].events = POLLIN;
209		i = PFD_MRT_START;
210		LIST_FOREACH(mconf, &mrtconf, list)
211			if (mconf->msgbuf.queued > 0) {
212				pfd[i].fd = mconf->msgbuf.sock;
213				pfd[i].events |= POLLOUT;
214				mrt[i++] = mconf;
215			}
216
217		if ((nfds = poll(pfd, i, INFTIM)) == -1)
218			if (errno != EINTR)
219				fatal("poll error", errno);
220
221		if (nfds > 0 && (pfd[PFD_PIPE_SESSION].revents & POLLOUT))
222			if ((n = msgbuf_write(&ibuf_se.w)) < 0)
223				fatal("pipe write error", errno);
224
225		if (nfds > 0 && (pfd[PFD_PIPE_ROUTE].revents & POLLOUT))
226			if ((n = msgbuf_write(&ibuf_rde.w)) < 0)
227				fatal("pipe write error", errno);
228
229		if (nfds > 0 && pfd[PFD_PIPE_SESSION].revents & POLLIN) {
230			nfds--;
231			dispatch_imsg(&ibuf_se, PFD_PIPE_SESSION, &mrtconf);
232		}
233
234		if (nfds > 0 && pfd[PFD_PIPE_ROUTE].revents & POLLIN) {
235			nfds--;
236			dispatch_imsg(&ibuf_rde, PFD_PIPE_ROUTE, &mrtconf);
237		}
238
239		if (nfds > 0 && pfd[PFD_SOCK_ROUTE].revents & POLLIN) {
240			nfds--;
241			kroute_dispatch_msg(rfd);
242		}
243
244		for (j = PFD_MRT_START; j < i && nfds > 0 ; j++) {
245			if (pfd[j].revents & POLLOUT) {
246				if ((n = msgbuf_write(&mrt[i]->msgbuf)) < 0)
247					fatal("pipe write error", errno);
248			}
249		}
250
251		if (reconfig) {
252			logit(LOG_CRIT, "rereading config");
253			reconfigure(conffile, &conf, &mrtconf);
254			LIST_FOREACH(mconf, &mrtconf, list)
255				mrt_state(mconf, IMSG_NONE, &ibuf_rde);
256			reconfig = 0;
257		}
258
259		if (mrtdump == 1) {
260			mrt_alrm(&mrtconf, &ibuf_rde);
261			mrtdump = 0;
262		} else if (mrtdump == 2) {
263			mrt_usr1(&mrtconf, &ibuf_rde);
264			mrtdump = 0;
265		}
266	}
267
268	signal(SIGCHLD, SIG_IGN);
269
270	if (io_pid)
271		kill(io_pid, SIGTERM);
272
273	if (rde_pid)
274		kill(rde_pid, SIGTERM);
275
276	do {
277		i = waitpid(-1, NULL, WNOHANG);
278	} while (i > 0 || (i == -1 && errno == EINTR));
279
280	kroute_shutdown(rfd);
281
282	logit(LOG_CRIT, "Terminating");
283	return (0);
284}
285
286int
287reconfigure(char *conffile, struct bgpd_config *conf, struct mrt_config *mrtc)
288{
289	struct peer		*p;
290
291	if (parse_config(conffile, conf, mrtc)) {
292		logit(LOG_CRIT, "config file %s has errors, not reloading",
293		    conffile);
294		return (-1);
295	}
296	imsg_compose(&ibuf_se, IMSG_RECONF_CONF, 0,
297	    conf, sizeof(struct bgpd_config));
298	imsg_compose(&ibuf_rde, IMSG_RECONF_CONF, 0,
299	    conf, sizeof(struct bgpd_config));
300	for (p = conf->peers; p != NULL; p = p->next) {
301		imsg_compose(&ibuf_se, IMSG_RECONF_PEER, p->conf.id,
302		    &p->conf, sizeof(struct peer_config));
303		imsg_compose(&ibuf_rde, IMSG_RECONF_PEER, p->conf.id,
304		    &p->conf, sizeof(struct peer_config));
305	}
306	imsg_compose(&ibuf_se, IMSG_RECONF_DONE, 0, NULL, 0);
307	imsg_compose(&ibuf_rde, IMSG_RECONF_DONE, 0, NULL, 0);
308
309	return (0);
310}
311
312/*
313 * XXX currently messages are only buffered for mrt files.
314 */
315int
316dispatch_imsg(struct imsgbuf *ibuf, int idx, struct mrt_config *conf)
317{
318	struct imsg		 imsg;
319	struct buf		*wbuf;
320	struct mrtdump_config	*m;
321	ssize_t			 len;
322	int			 n;
323	in_addr_t		 ina;
324
325	if (imsg_get(ibuf, &imsg) > 0) {
326		switch (imsg.hdr.type) {
327		case IMSG_MRT_MSG:
328		case IMSG_MRT_END:
329			LIST_FOREACH(m, conf, list) {
330				if (m->id != imsg.hdr.peerid)
331					continue;
332				if (mrt_state(m, imsg.hdr.type, ibuf) == 0)
333					break;
334				if (m->msgbuf.sock == -1)
335					break;
336				len = imsg.hdr.len - IMSG_HEADER_SIZE;
337				wbuf = buf_open(len);
338				if (wbuf == NULL)
339					fatal("buf_open error", 0);
340				if (buf_add(wbuf, imsg.data, len) == -1)
341					fatal("buf_add error", 0);
342				if ((n = buf_close(&m->msgbuf, wbuf)) < 0)
343					fatal("buf_close error", 0);
344				break;
345			}
346			break;
347		case IMSG_KROUTE_CHANGE:
348			if (idx != PFD_PIPE_ROUTE)
349				fatal("route request not from RDE", 0);
350			if (kroute_change(rfd, imsg.data))
351				fatal("kroute_change error", errno);
352			break;
353		case IMSG_KROUTE_DELETE:
354			if (idx != PFD_PIPE_ROUTE)
355				fatal("route request not from RDE", 0);
356			if (kroute_delete(rfd, imsg.data))
357				fatal("kroute_delete error", errno);
358			break;
359		case IMSG_NEXTHOP_ADD:
360			if (idx != PFD_PIPE_ROUTE)
361				fatal("nexthop request not from RDE", 0);
362			memcpy(&ina, imsg.data, sizeof(ina));
363			kroute_nexthop_add(ina);
364			break;
365		case IMSG_NEXTHOP_REMOVE:
366			if (idx != PFD_PIPE_ROUTE)
367				fatal("nexthop request not from RDE", 0);
368			memcpy(&ina, imsg.data, sizeof(ina));
369			kroute_nexthop_delete(ina);
370			break;
371		default:
372			break;
373		}
374		imsg_free(&imsg);
375	}
376	return (0);
377}
378
379void
380send_nexthop_update(struct kroute_nexthop *msg)
381{
382	logit(LOG_INFO, "nexthop %s now %s%s%s%s", log_ntoa(msg->nexthop),
383	    msg->valid ? "valid" : "invalid",
384	    msg->connected ? ": directly connected" : "",
385	    msg->gateway ? ": via " : "",
386	    msg->gateway ? log_ntoa(msg->gateway) : "");
387
388	imsg_compose(&ibuf_rde, IMSG_NEXTHOP_UPDATE, 0,
389	    msg, sizeof(struct kroute_nexthop));
390}
391