rtsold.c revision 222861 
1/*	$KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $	*/
2
3/*
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $FreeBSD: head/usr.sbin/rtsold/rtsold.c 222861 2011-06-08 16:03:29Z hrs $
32 */
33
34#include <sys/types.h>
35#include <sys/ioctl.h>
36#include <sys/time.h>
37#include <sys/socket.h>
38#include <sys/param.h>
39
40#include <net/if.h>
41#include <net/if_dl.h>
42#include <net/if_var.h>
43
44#include <netinet/in.h>
45#include <netinet/icmp6.h>
46#include <netinet/in_var.h>
47#include <arpa/inet.h>
48
49#include <netinet6/nd6.h>
50
51#include <signal.h>
52#include <unistd.h>
53#include <syslog.h>
54#include <string.h>
55#include <stdlib.h>
56#include <stdio.h>
57#include <errno.h>
58#include <err.h>
59#include <stdarg.h>
60#include <ifaddrs.h>
61#ifdef HAVE_POLL_H
62#include <poll.h>
63#endif
64
65#include "rtsold.h"
66
67#define RTSOL_DUMPFILE	"/var/run/rtsold.dump";
68#define RTSOL_PIDFILE	"/var/run/rtsold.pid";
69
70struct ifinfo *iflist;
71struct timeval tm_max =	{0x7fffffff, 0x7fffffff};
72static int log_upto = 999;
73static int fflag = 0;
74
75int Fflag = 0;	/* force setting sysctl parameters */
76int aflag = 0;
77int dflag = 0;
78
79const char *otherconf_script;
80const char *resolvconf_script = "/sbin/resolvconf";
81
82/* protocol constants */
83#define MAX_RTR_SOLICITATION_DELAY	1 /* second */
84#define RTR_SOLICITATION_INTERVAL	4 /* seconds */
85#define MAX_RTR_SOLICITATIONS		3 /* times */
86
87/*
88 * implementation dependent constants in seconds
89 * XXX: should be configurable
90 */
91#define PROBE_INTERVAL 60
92
93/* static variables and functions */
94static int mobile_node = 0;
95static const char *pidfilename = RTSOL_PIDFILE;
96
97#ifndef SMALL
98static int do_dump;
99static const char *dumpfilename = RTSOL_DUMPFILE;
100#endif
101
102#if 0
103static int ifreconfig(char *);
104#endif
105
106static int make_packet(struct ifinfo *);
107static struct timeval *rtsol_check_timer(void);
108
109#ifndef SMALL
110static void rtsold_set_dump_file(int);
111#endif
112static void usage(void);
113
114int
115main(int argc, char **argv)
116{
117	int s, ch, once = 0;
118	struct timeval *timeout;
119	const char *opts;
120#ifdef HAVE_POLL_H
121	struct pollfd set[2];
122#else
123	fd_set *fdsetp, *selectfdp;
124	int fdmasks;
125	int maxfd;
126#endif
127	int rtsock;
128	char *argv0;
129
130#ifndef SMALL
131	/* rtsold */
132	opts = "adDfFm1O:P:R:";
133#else
134	/* rtsol */
135	opts = "adDFO:P:R:";
136	fflag = 1;
137	once = 1;
138#endif
139	argv0 = argv[0];
140
141	while ((ch = getopt(argc, argv, opts)) != -1) {
142		switch (ch) {
143		case 'a':
144			aflag = 1;
145			break;
146		case 'd':
147			dflag = 1;
148			break;
149		case 'D':
150			dflag = 2;
151			break;
152		case 'f':
153			fflag = 1;
154			break;
155		case 'F':
156			Fflag = 1;
157			break;
158		case 'm':
159			mobile_node = 1;
160			break;
161		case '1':
162			once = 1;
163			break;
164		case 'O':
165			otherconf_script = optarg;
166			break;
167		case 'P':
168			pidfilename = optarg;
169			break;
170		case 'R':
171			resolvconf_script = optarg;
172			break;
173		default:
174			usage();
175			exit(1);
176		}
177	}
178	argc -= optind;
179	argv += optind;
180
181	if ((!aflag && argc == 0) || (aflag && argc != 0)) {
182		usage();
183		exit(1);
184	}
185
186	/* set log level */
187	if (dflag == 0)
188		log_upto = LOG_NOTICE;
189	if (!fflag) {
190		char *ident;
191
192		ident = strrchr(argv0, '/');
193		if (!ident)
194			ident = argv0;
195		else
196			ident++;
197		openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON);
198		if (log_upto >= 0)
199			setlogmask(LOG_UPTO(log_upto));
200	}
201
202	if (otherconf_script && *otherconf_script != '/') {
203		errx(1, "configuration script (%s) must be an absolute path",
204		    otherconf_script);
205	}
206	if (resolvconf_script && *resolvconf_script != '/') {
207		errx(1, "configuration script (%s) must be an absolute path",
208		    resolvconf_script);
209	}
210	if (pidfilename && *pidfilename != '/') {
211		errx(1, "pid filename (%s) must be an absolute path",
212		    pidfilename);
213	}
214#ifndef HAVE_ARC4RANDOM
215	/* random value initialization */
216	srandom((u_long)time(NULL));
217#endif
218
219	if (Fflag) {
220		setinet6sysctl(IPV6CTL_FORWARDING, 0);
221	} else {
222		/* warn if forwarding is up */
223		if (getinet6sysctl(IPV6CTL_FORWARDING))
224			warnx("kernel is configured as a router, not a host");
225	}
226
227#ifndef SMALL
228	/* initialization to dump internal status to a file */
229	signal(SIGUSR1, rtsold_set_dump_file);
230#endif
231
232	if (!fflag)
233		daemon(0, 0);		/* act as a daemon */
234
235	/*
236	 * Open a socket for sending RS and receiving RA.
237	 * This should be done before calling ifinit(), since the function
238	 * uses the socket.
239	 */
240	if ((s = sockopen()) < 0) {
241		warnmsg(LOG_ERR, __func__, "failed to open a socket");
242		exit(1);
243	}
244#ifdef HAVE_POLL_H
245	set[0].fd = s;
246	set[0].events = POLLIN;
247#else
248	maxfd = s;
249#endif
250
251#ifdef HAVE_POLL_H
252	set[1].fd = -1;
253#endif
254
255	if ((rtsock = rtsock_open()) < 0) {
256		warnmsg(LOG_ERR, __func__, "failed to open a socket");
257		exit(1);
258	}
259#ifdef HAVE_POLL_H
260	set[1].fd = rtsock;
261	set[1].events = POLLIN;
262#else
263	if (rtsock > maxfd)
264		maxfd = rtsock;
265#endif
266
267#ifndef HAVE_POLL_H
268	fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
269	if ((fdsetp = malloc(fdmasks)) == NULL) {
270		warnmsg(LOG_ERR, __func__, "malloc");
271		exit(1);
272	}
273	if ((selectfdp = malloc(fdmasks)) == NULL) {
274		warnmsg(LOG_ERR, __func__, "malloc");
275		exit(1);
276	}
277#endif
278
279	/* configuration per interface */
280	if (ifinit()) {
281		warnmsg(LOG_ERR, __func__,
282		    "failed to initialize interfaces");
283		exit(1);
284	}
285	if (aflag)
286		argv = autoifprobe();
287	while (argv && *argv) {
288		if (ifconfig(*argv)) {
289			warnmsg(LOG_ERR, __func__,
290			    "failed to initialize %s", *argv);
291			exit(1);
292		}
293		argv++;
294	}
295
296	/* setup for probing default routers */
297	if (probe_init()) {
298		warnmsg(LOG_ERR, __func__,
299		    "failed to setup for probing routers");
300		exit(1);
301		/*NOTREACHED*/
302	}
303
304	/* dump the current pid */
305	if (!once) {
306		pid_t pid = getpid();
307		FILE *fp;
308
309		if ((fp = fopen(pidfilename, "w")) == NULL)
310			warnmsg(LOG_ERR, __func__,
311			    "failed to open a pid log file(%s): %s",
312			    pidfilename, strerror(errno));
313		else {
314			fprintf(fp, "%d\n", pid);
315			fclose(fp);
316		}
317	}
318#ifndef HAVE_POLL_H
319	memset(fdsetp, 0, fdmasks);
320	FD_SET(s, fdsetp);
321	FD_SET(rtsock, fdsetp);
322#endif
323	while (1) {		/* main loop */
324		int e;
325
326#ifndef HAVE_POLL_H
327		memcpy(selectfdp, fdsetp, fdmasks);
328#endif
329
330#ifndef SMALL
331		if (do_dump) {	/* SIGUSR1 */
332			do_dump = 0;
333			rtsold_dump_file(dumpfilename);
334		}
335#endif
336
337		timeout = rtsol_check_timer();
338
339		if (once) {
340			struct ifinfo *ifi;
341
342			/* if we have no timeout, we are done (or failed) */
343			if (timeout == NULL)
344				break;
345
346			/* if all interfaces have got RA packet, we are done */
347			TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
348				if (ifi->state != IFS_DOWN && ifi->racnt == 0)
349					break;
350			}
351			if (ifi == NULL)
352				break;
353		}
354#ifdef HAVE_POLL_H
355		e = poll(set, 2, timeout ? (timeout->tv_sec * 1000 + timeout->tv_usec / 1000) : INFTIM);
356#else
357		e = select(maxfd + 1, selectfdp, NULL, NULL, timeout);
358#endif
359		if (e < 1) {
360			if (e < 0 && errno != EINTR) {
361				warnmsg(LOG_ERR, __func__, "select: %s",
362				    strerror(errno));
363			}
364			continue;
365		}
366
367		/* packet reception */
368#ifdef HAVE_POLL_H
369		if (set[1].revents & POLLIN)
370#else
371		if (FD_ISSET(rtsock, selectfdp))
372#endif
373			rtsock_input(rtsock);
374#ifdef HAVE_POLL_H
375		if (set[0].revents & POLLIN)
376#else
377		if (FD_ISSET(s, selectfdp))
378#endif
379			rtsol_input(s);
380	}
381	/* NOTREACHED */
382
383	return (0);
384}
385
386int
387ifconfig(char *ifname)
388{
389	struct ifinfo *ifi;
390	struct sockaddr_dl *sdl;
391	int flags;
392
393	if ((sdl = if_nametosdl(ifname)) == NULL) {
394		warnmsg(LOG_ERR, __func__,
395		    "failed to get link layer information for %s", ifname);
396		return (-1);
397	}
398	if (find_ifinfo(sdl->sdl_index)) {
399		warnmsg(LOG_ERR, __func__,
400		    "interface %s was already configured", ifname);
401		free(sdl);
402		return (-1);
403	}
404
405	if ((ifi = malloc(sizeof(*ifi))) == NULL) {
406		warnmsg(LOG_ERR, __func__, "memory allocation failed");
407		free(sdl);
408		return (-1);
409	}
410	memset(ifi, 0, sizeof(*ifi));
411	ifi->sdl = sdl;
412	ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
413	ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
414	TAILQ_INIT(&ifi->ifi_rainfo);
415	strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
416
417	/* construct a router solicitation message */
418	if (make_packet(ifi))
419		goto bad;
420
421	/* set link ID of this interface. */
422#ifdef HAVE_SCOPELIB
423	if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
424		goto bad;
425#else
426	/* XXX: assume interface IDs as link IDs */
427	ifi->linkid = ifi->sdl->sdl_index;
428#endif
429
430	/*
431	 * check if the interface is available.
432	 * also check if SIOCGIFMEDIA ioctl is OK on the interface.
433	 */
434	ifi->mediareqok = 1;
435	ifi->active = interface_status(ifi);
436	if (!ifi->mediareqok) {
437		/*
438		 * probe routers periodically even if the link status
439		 * does not change.
440		 */
441		ifi->probeinterval = PROBE_INTERVAL;
442	}
443
444	/* activate interface: interface_up returns 0 on success */
445	flags = interface_up(ifi->ifname);
446	if (flags == 0)
447		ifi->state = IFS_DELAY;
448	else if (flags == IFS_TENTATIVE)
449		ifi->state = IFS_TENTATIVE;
450	else
451		ifi->state = IFS_DOWN;
452
453	rtsol_timer_update(ifi);
454
455	TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
456	return (0);
457
458bad:
459	free(ifi->sdl);
460	free(ifi);
461	return (-1);
462}
463
464void
465iflist_init(void)
466{
467	struct ifinfo *ifi;
468
469	while ((ifi = TAILQ_FIRST(&ifinfo_head)) != NULL) {
470		TAILQ_REMOVE(&ifinfo_head, ifi, ifi_next);
471		if (ifi->sdl != NULL)
472			free(ifi->sdl);
473		if (ifi->rs_data != NULL)
474			free(ifi->rs_data);
475		free(ifi);
476	}
477}
478
479#if 0
480static int
481ifreconfig(char *ifname)
482{
483	struct ifinfo *ifi, *prev;
484	int rv;
485
486	prev = NULL;
487	TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
488		if (strncmp(ifi->ifname, ifname, sizeof(ifi->ifname)) == 0)
489			break;
490		prev = ifi;
491	}
492	prev->next = ifi->next;
493
494	rv = ifconfig(ifname);
495
496	/* reclaim it after ifconfig() in case ifname is pointer inside ifi */
497	if (ifi->rs_data)
498		free(ifi->rs_data);
499	free(ifi->sdl);
500	free(ifi);
501
502	return (rv);
503}
504#endif
505
506struct rainfo *
507find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
508{
509	struct rainfo *rai;
510
511	TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
512		if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
513		    sizeof(rai->rai_saddr.sin6_addr)) == 0)
514			return (rai);
515
516	return (NULL);
517}
518
519struct ifinfo *
520find_ifinfo(int ifindex)
521{
522	struct ifinfo *ifi;
523
524	TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
525		if (ifi->sdl->sdl_index == ifindex)
526			return (ifi);
527	}
528	return (NULL);
529}
530
531static int
532make_packet(struct ifinfo *ifi)
533{
534	size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
535	struct nd_router_solicit *rs;
536	char *buf;
537
538	if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
539		warnmsg(LOG_INFO, __func__,
540		    "link-layer address option has null length"
541		    " on %s. Treat as not included.", ifi->ifname);
542	}
543	packlen += lladdroptlen;
544	ifi->rs_datalen = packlen;
545
546	/* allocate buffer */
547	if ((buf = malloc(packlen)) == NULL) {
548		warnmsg(LOG_ERR, __func__,
549		    "memory allocation failed for %s", ifi->ifname);
550		return (-1);
551	}
552	ifi->rs_data = buf;
553
554	/* fill in the message */
555	rs = (struct nd_router_solicit *)buf;
556	rs->nd_rs_type = ND_ROUTER_SOLICIT;
557	rs->nd_rs_code = 0;
558	rs->nd_rs_cksum = 0;
559	rs->nd_rs_reserved = 0;
560	buf += sizeof(*rs);
561
562	/* fill in source link-layer address option */
563	if (lladdroptlen)
564		lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
565
566	return (0);
567}
568
569static struct timeval *
570rtsol_check_timer(void)
571{
572	static struct timeval returnval;
573	struct timeval now, rtsol_timer;
574	struct ifinfo *ifi;
575	struct rainfo *rai;
576	struct ra_opt *rao;
577	int flags;
578
579	gettimeofday(&now, NULL);
580
581	rtsol_timer = tm_max;
582
583	TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
584		if (timercmp(&ifi->expire, &now, <=)) {
585			warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
586			    "state = %d", ifi->ifname, ifi->state);
587
588			while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
589				/* Remove all RA options. */
590				TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
591				while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
592				    NULL) {
593					TAILQ_REMOVE(&rai->rai_ra_opt, rao,
594					    rao_next);
595					if (rao->rao_msg != NULL)
596						free(rao->rao_msg);
597					free(rao);
598				}
599				free(rai);
600			}
601			switch (ifi->state) {
602			case IFS_DOWN:
603			case IFS_TENTATIVE:
604				/* interface_up returns 0 on success */
605				flags = interface_up(ifi->ifname);
606				if (flags == 0)
607					ifi->state = IFS_DELAY;
608				else if (flags == IFS_TENTATIVE)
609					ifi->state = IFS_TENTATIVE;
610				else
611					ifi->state = IFS_DOWN;
612				break;
613			case IFS_IDLE:
614			{
615				int oldstatus = ifi->active;
616				int probe = 0;
617
618				ifi->active = interface_status(ifi);
619
620				if (oldstatus != ifi->active) {
621					warnmsg(LOG_DEBUG, __func__,
622					    "%s status is changed"
623					    " from %d to %d",
624					    ifi->ifname,
625					    oldstatus, ifi->active);
626					probe = 1;
627					ifi->state = IFS_DELAY;
628				} else if (ifi->probeinterval &&
629				    (ifi->probetimer -=
630				    ifi->timer.tv_sec) <= 0) {
631					/* probe timer expired */
632					ifi->probetimer =
633					    ifi->probeinterval;
634					probe = 1;
635					ifi->state = IFS_PROBE;
636				}
637
638				/*
639				 * If we need a probe, clear the previous
640				 * status wrt the "other" configuration.
641				 */
642				if (probe)
643					ifi->otherconfig = 0;
644
645				if (probe && mobile_node)
646					defrouter_probe(ifi);
647				break;
648			}
649			case IFS_DELAY:
650				ifi->state = IFS_PROBE;
651				sendpacket(ifi);
652				break;
653			case IFS_PROBE:
654				if (ifi->probes < MAX_RTR_SOLICITATIONS)
655					sendpacket(ifi);
656				else {
657					warnmsg(LOG_INFO, __func__,
658					    "No answer after sending %d RSs",
659					    ifi->probes);
660					ifi->probes = 0;
661					ifi->state = IFS_IDLE;
662				}
663				break;
664			}
665			rtsol_timer_update(ifi);
666		} else {
667			/* Expiration check for RA options. */
668			int expire = 0;
669
670			TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
671				TAILQ_FOREACH(rao, &rai->rai_ra_opt, rao_next) {
672					warnmsg(LOG_DEBUG, __func__,
673					    "RA expiration timer: "
674					    "type=%d, msg=%s, expire=%s",
675					    rao->rao_type, (char *)rao->rao_msg,
676						sec2str(&rao->rao_expire));
677					if (timercmp(&now, &rao->rao_expire,
678					    >=)) {
679						warnmsg(LOG_DEBUG, __func__,
680						    "RA expiration timer: "
681						    "expired.");
682						TAILQ_REMOVE(&rai->rai_ra_opt,
683						    rao, rao_next);
684						if (rao->rao_msg != NULL)
685							free(rao->rao_msg);
686						free(rao);
687						expire = 1;
688					}
689				}
690			}
691			if (expire)
692				ra_opt_handler(ifi);
693		}
694		if (timercmp(&ifi->expire, &rtsol_timer, <))
695			rtsol_timer = ifi->expire;
696	}
697
698	if (timercmp(&rtsol_timer, &tm_max, ==)) {
699		warnmsg(LOG_DEBUG, __func__, "there is no timer");
700		return (NULL);
701	} else if (timercmp(&rtsol_timer, &now, <))
702		/* this may occur when the interval is too small */
703		returnval.tv_sec = returnval.tv_usec = 0;
704	else
705		timersub(&rtsol_timer, &now, &returnval);
706
707	now.tv_sec += returnval.tv_sec;
708	now.tv_usec += returnval.tv_usec;
709	warnmsg(LOG_DEBUG, __func__, "New timer is %s",
710	    sec2str(&now));
711
712	return (&returnval);
713}
714
715void
716rtsol_timer_update(struct ifinfo *ifi)
717{
718#define MILLION 1000000
719#define DADRETRY 10		/* XXX: adhoc */
720	long interval;
721	struct timeval now;
722
723	bzero(&ifi->timer, sizeof(ifi->timer));
724
725	switch (ifi->state) {
726	case IFS_DOWN:
727	case IFS_TENTATIVE:
728		if (++ifi->dadcount > DADRETRY) {
729			ifi->dadcount = 0;
730			ifi->timer.tv_sec = PROBE_INTERVAL;
731		} else
732			ifi->timer.tv_sec = 1;
733		break;
734	case IFS_IDLE:
735		if (mobile_node) {
736			/* XXX should be configurable */
737			ifi->timer.tv_sec = 3;
738		}
739		else
740			ifi->timer = tm_max;	/* stop timer(valid?) */
741		break;
742	case IFS_DELAY:
743#ifndef HAVE_ARC4RANDOM
744		interval = random() % (MAX_RTR_SOLICITATION_DELAY * MILLION);
745#else
746		interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
747#endif
748		ifi->timer.tv_sec = interval / MILLION;
749		ifi->timer.tv_usec = interval % MILLION;
750		break;
751	case IFS_PROBE:
752		if (ifi->probes < MAX_RTR_SOLICITATIONS)
753			ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
754		else {
755			/*
756			 * After sending MAX_RTR_SOLICITATIONS solicitations,
757			 * we're just waiting for possible replies; there
758			 * will be no more solicitation.  Thus, we change
759			 * the timer value to MAX_RTR_SOLICITATION_DELAY based
760			 * on RFC 2461, Section 6.3.7.
761			 */
762			ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
763		}
764		break;
765	default:
766		warnmsg(LOG_ERR, __func__,
767		    "illegal interface state(%d) on %s",
768		    ifi->state, ifi->ifname);
769		return;
770	}
771
772	/* reset the timer */
773	if (timercmp(&ifi->timer, &tm_max, ==)) {
774		ifi->expire = tm_max;
775		warnmsg(LOG_DEBUG, __func__,
776		    "stop timer for %s", ifi->ifname);
777	} else {
778		gettimeofday(&now, NULL);
779		timeradd(&now, &ifi->timer, &ifi->expire);
780
781		now.tv_sec += ifi->timer.tv_sec;
782		now.tv_usec += ifi->timer.tv_usec;
783		warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
784		    ifi->ifname, sec2str(&now));
785	}
786
787#undef MILLION
788}
789
790/* timer related utility functions */
791#define MILLION 1000000
792
793#ifndef SMALL
794static void
795rtsold_set_dump_file(int sig __unused)
796{
797	do_dump = 1;
798}
799#endif
800
801static void
802usage(void)
803{
804#ifndef SMALL
805	fprintf(stderr, "usage: rtsold [-adDfFm1] [-O script-name] "
806	    "[-P pidfile] [-R script-name] interfaces...\n");
807	fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
808	    "[-P pidfile] [-R script-name] -a\n");
809#else
810	fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
811	    "[-P pidfile] [-R script-name] interfaces...\n");
812	fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
813	    "[-P pidfile] [-R script-name] -a\n");
814#endif
815}
816
817void
818warnmsg(int priority, const char *func, const char *msg, ...)
819{
820	va_list ap;
821	char buf[BUFSIZ];
822
823	va_start(ap, msg);
824	if (fflag) {
825		if (priority <= log_upto) {
826			(void)vfprintf(stderr, msg, ap);
827			(void)fprintf(stderr, "\n");
828		}
829	} else {
830		snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
831		msg = buf;
832		vsyslog(priority, msg, ap);
833	}
834	va_end(ap);
835}
836
837/*
838 * return a list of interfaces which is suitable to sending an RS.
839 */
840char **
841autoifprobe(void)
842{
843	static char **argv = NULL;
844	static int n = 0;
845	char **a;
846	int s = 0, i, found;
847	struct ifaddrs *ifap, *ifa, *target;
848	struct in6_ndireq nd;
849
850	/* initialize */
851	while (n--)
852		free(argv[n]);
853	if (argv) {
854		free(argv);
855		argv = NULL;
856	}
857	n = 0;
858
859	if (getifaddrs(&ifap) != 0)
860		return (NULL);
861
862	if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
863		warnmsg(LOG_ERR, __func__, "socket");
864		exit(1);
865	}
866
867	target = NULL;
868	/* find an ethernet */
869	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
870		if ((ifa->ifa_flags & IFF_UP) == 0)
871			continue;
872		if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
873			continue;
874		if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
875			continue;
876		if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
877			continue;
878
879		if (ifa->ifa_addr->sa_family != AF_INET6)
880			continue;
881
882		found = 0;
883		for (i = 0; i < n; i++) {
884			if (strcmp(argv[i], ifa->ifa_name) == 0) {
885				found++;
886				break;
887			}
888		}
889		if (found)
890			continue;
891
892		/*
893		 * Skip the interfaces which IPv6 and/or accepting RA
894		 * is disabled.
895		 */
896		if (!Fflag) {
897			memset(&nd, 0, sizeof(nd));
898			strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
899			if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
900				warnmsg(LOG_ERR, __func__,
901					"ioctl(SIOCGIFINFO_IN6)");
902				exit(1);
903			}
904			if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
905				continue;
906			if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
907				continue;
908		}
909
910		/* if we find multiple candidates, just warn. */
911		if (n != 0 && dflag > 1)
912			warnmsg(LOG_WARNING, __func__,
913				"multiple interfaces found");
914
915		a = (char **)realloc(argv, (n + 1) * sizeof(char **));
916		if (a == NULL) {
917			warnmsg(LOG_ERR, __func__, "realloc");
918			exit(1);
919		}
920		argv = a;
921		argv[n] = strdup(ifa->ifa_name);
922		if (!argv[n]) {
923			warnmsg(LOG_ERR, __func__, "malloc");
924			exit(1);
925		}
926		n++;
927	}
928
929	if (n) {
930		a = (char **)realloc(argv, (n + 1) * sizeof(char **));
931		if (a == NULL) {
932			warnmsg(LOG_ERR, __func__, "realloc");
933			exit(1);
934		}
935		argv = a;
936		argv[n] = NULL;
937
938		if (dflag > 0) {
939			for (i = 0; i < n; i++)
940				warnmsg(LOG_WARNING, __func__, "probing %s",
941					argv[i]);
942		}
943	}
944	if (!Fflag)
945		close(s);
946	freeifaddrs(ifap);
947	return (argv);
948}
949