1/*	$KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD$
34 */
35
36#include <sys/param.h>
37#include <sys/capsicum.h>
38#include <sys/event.h>
39#include <sys/ioctl.h>
40#include <sys/socket.h>
41
42#include <net/if.h>
43#include <net/if_dl.h>
44
45#include <netinet/in.h>
46#include <netinet/icmp6.h>
47#include <netinet/in_var.h>
48#include <arpa/inet.h>
49
50#include <netinet6/nd6.h>
51
52#include <capsicum_helpers.h>
53#include <err.h>
54#include <errno.h>
55#include <ifaddrs.h>
56#include <libgen.h>
57#include <signal.h>
58#include <stdarg.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <syslog.h>
63#include <time.h>
64#include <unistd.h>
65
66#include <libcasper.h>
67#include <casper/cap_syslog.h>
68#include <libutil.h>
69
70#include "rtsold.h"
71
72#define RTSOL_DUMPFILE	"/var/run/rtsold.dump"
73
74struct timespec tm_max;
75static int log_upto = 999;
76static int fflag = 0;
77
78int Fflag = 0;	/* force setting sysctl parameters */
79int aflag = 0;
80int dflag = 0;
81int uflag = 0;
82
83const char *managedconf_script;
84const char *otherconf_script;
85const char *resolvconf_script = "/sbin/resolvconf";
86
87cap_channel_t *capllflags, *capscript, *capsendmsg, *capsyslog;
88
89/* protocol constants */
90#define MAX_RTR_SOLICITATION_DELAY	1 /* second */
91#define RTR_SOLICITATION_INTERVAL	4 /* seconds */
92#define MAX_RTR_SOLICITATIONS		3 /* times */
93
94/*
95 * implementation dependent constants in seconds
96 * XXX: should be configurable
97 */
98#define PROBE_INTERVAL 60
99
100/* static variables and functions */
101static int mobile_node = 0;
102
103static sig_atomic_t do_dump, do_exit;
104static struct pidfh *pfh;
105
106static char **autoifprobe(void);
107static int ifconfig(char *ifname);
108static int init_capabilities(void);
109static int make_packet(struct ifinfo *);
110static struct timespec *rtsol_check_timer(void);
111
112static void set_dumpfile(int);
113static void set_exit(int);
114static void usage(const char *progname);
115
116int
117main(int argc, char **argv)
118{
119	struct kevent events[2];
120	FILE *dumpfp;
121	struct ifinfo *ifi;
122	struct timespec *timeout;
123	const char *opts, *pidfilepath, *progname;
124	int ch, error, kq, once, rcvsock, rtsock;
125
126	progname = basename(argv[0]);
127	if (strcmp(progname, "rtsold") == 0) {
128		opts = "adDfFm1M:O:p:R:u";
129		once = 0;
130		pidfilepath = NULL;
131	} else {
132		opts = "adDFM:O:R:u";
133		fflag = 1;
134		once = 1;
135	}
136
137	while ((ch = getopt(argc, argv, opts)) != -1) {
138		switch (ch) {
139		case 'a':
140			aflag = 1;
141			break;
142		case 'd':
143			dflag += 1;
144			break;
145		case 'D':
146			dflag += 2;
147			break;
148		case 'f':
149			fflag = 1;
150			break;
151		case 'F':
152			Fflag = 1;
153			break;
154		case 'm':
155			mobile_node = 1;
156			break;
157		case '1':
158			once = 1;
159			break;
160		case 'M':
161			managedconf_script = optarg;
162			break;
163		case 'O':
164			otherconf_script = optarg;
165			break;
166		case 'p':
167			pidfilepath = optarg;
168			break;
169		case 'R':
170			resolvconf_script = optarg;
171			break;
172		case 'u':
173			uflag = 1;
174			break;
175		default:
176			usage(progname);
177		}
178	}
179	argc -= optind;
180	argv += optind;
181
182	if ((!aflag && argc == 0) || (aflag && argc != 0))
183		usage(progname);
184
185	/* Generate maximum time in timespec. */
186	tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1));
187	tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1));
188
189	/* set log level */
190	if (dflag > 1)
191		log_upto = LOG_DEBUG;
192	else if (dflag > 0)
193		log_upto = LOG_INFO;
194	else
195		log_upto = LOG_NOTICE;
196
197	if (managedconf_script != NULL && *managedconf_script != '/')
198		errx(1, "configuration script (%s) must be an absolute path",
199		    managedconf_script);
200	if (otherconf_script != NULL && *otherconf_script != '/')
201		errx(1, "configuration script (%s) must be an absolute path",
202		    otherconf_script);
203	if (*resolvconf_script != '/')
204		errx(1, "configuration script (%s) must be an absolute path",
205		    resolvconf_script);
206
207	if (!fflag) {
208		pfh = pidfile_open(pidfilepath, 0644, NULL);
209		if (pfh == NULL)
210			errx(1, "failed to open pidfile: %s", strerror(errno));
211		if (daemon(0, 0) != 0)
212			errx(1, "failed to daemonize");
213	}
214
215	if ((error = init_capabilities()) != 0)
216		err(1, "failed to initialize capabilities");
217
218	if (!fflag) {
219		cap_openlog(capsyslog, progname, LOG_NDELAY | LOG_PID,
220		    LOG_DAEMON);
221		if (log_upto >= 0)
222			(void)cap_setlogmask(capsyslog, LOG_UPTO(log_upto));
223		(void)signal(SIGTERM, set_exit);
224		(void)signal(SIGINT, set_exit);
225		(void)signal(SIGUSR1, set_dumpfile);
226		dumpfp = rtsold_init_dumpfile(RTSOL_DUMPFILE);
227	} else
228		dumpfp = NULL;
229
230	kq = kqueue();
231	if (kq < 0) {
232		warnmsg(LOG_ERR, __func__, "failed to create a kqueue: %s",
233		    strerror(errno));
234		exit(1);
235	}
236
237	/* Open global sockets and register for read events. */
238	if ((rtsock = rtsock_open()) < 0) {
239		warnmsg(LOG_ERR, __func__, "failed to open routing socket");
240		exit(1);
241	}
242	if ((rcvsock = recvsockopen()) < 0) {
243		warnmsg(LOG_ERR, __func__, "failed to open receive socket");
244		exit(1);
245	}
246	EV_SET(&events[0], rtsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
247	EV_SET(&events[1], rcvsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
248	if (kevent(kq, events, 2, NULL, 0, NULL) < 0) {
249		warnmsg(LOG_ERR, __func__, "kevent(): %s", strerror(errno));
250		exit(1);
251	}
252
253	/* Probe network interfaces and set up tracking info. */
254	if (ifinit() != 0) {
255		warnmsg(LOG_ERR, __func__, "failed to initialize interfaces");
256		exit(1);
257	}
258	if (aflag)
259		argv = autoifprobe();
260	while (argv && *argv) {
261		if (ifconfig(*argv)) {
262			warnmsg(LOG_ERR, __func__,
263			    "failed to initialize %s", *argv);
264			exit(1);
265		}
266		argv++;
267	}
268
269	/* Write to our pidfile. */
270	if (pfh != NULL && pidfile_write(pfh) != 0) {
271		warnmsg(LOG_ERR, __func__,
272		    "failed to open pidfile: %s", strerror(errno));
273		exit(1);
274	}
275
276	/* Enter capability mode. */
277	caph_cache_catpages();
278	if (caph_enter_casper() != 0) {
279		warnmsg(LOG_ERR, __func__, "caph_enter(): %s", strerror(errno));
280		exit(1);
281	}
282
283	for (;;) {
284		if (do_exit) {
285			/* Handle SIGTERM, SIGINT. */
286			if (pfh != NULL)
287				pidfile_remove(pfh);
288			break;
289		}
290		if (do_dump) {
291			/* Handle SIGUSR1. */
292			do_dump = 0;
293			if (dumpfp != NULL)
294				rtsold_dump(dumpfp);
295		}
296
297		timeout = rtsol_check_timer();
298
299		if (once) {
300			/* if we have no timeout, we are done (or failed) */
301			if (timeout == NULL)
302				break;
303
304			/* if all interfaces have got RA packet, we are done */
305			TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
306				if (ifi->state != IFS_DOWN && ifi->racnt == 0)
307					break;
308			}
309			if (ifi == NULL)
310				break;
311		}
312
313		error = kevent(kq, NULL, 0, &events[0], 1, timeout);
314		if (error < 1) {
315			if (error < 0 && errno != EINTR)
316				warnmsg(LOG_ERR, __func__, "kevent(): %s",
317				    strerror(errno));
318			continue;
319		}
320
321		if (events[0].ident == (uintptr_t)rtsock)
322			rtsock_input(rtsock);
323		else
324			rtsol_input(rcvsock);
325	}
326
327	return (0);
328}
329
330static int
331init_capabilities(void)
332{
333#ifdef WITH_CASPER
334	const char *const scripts[] =
335	    { resolvconf_script, managedconf_script, otherconf_script };
336	cap_channel_t *capcasper;
337	nvlist_t *limits;
338	int count;
339
340	capcasper = cap_init();
341	if (capcasper == NULL)
342		return (-1);
343
344	capllflags = cap_service_open(capcasper, "rtsold.llflags");
345	if (capllflags == NULL)
346		return (-1);
347
348	capscript = cap_service_open(capcasper, "rtsold.script");
349	if (capscript == NULL)
350		return (-1);
351	count = 0;
352	for (size_t i = 0; i < nitems(scripts); i++)
353		if (scripts[i] != NULL)
354			count++;
355	limits = nvlist_create(0);
356	nvlist_add_string_array(limits, "scripts", scripts, count);
357	if (cap_limit_set(capscript, limits) != 0)
358		return (-1);
359
360	capsendmsg = cap_service_open(capcasper, "rtsold.sendmsg");
361	if (capsendmsg == NULL)
362		return (-1);
363
364	if (!fflag) {
365		capsyslog = cap_service_open(capcasper, "system.syslog");
366		if (capsyslog == NULL)
367			return (-1);
368	}
369
370	cap_close(capcasper);
371#endif /* WITH_CASPER */
372	return (0);
373}
374
375static int
376ifconfig(char *ifname)
377{
378	struct ifinfo *ifi;
379	struct sockaddr_dl *sdl;
380	int flags;
381
382	ifi = NULL;
383	if ((sdl = if_nametosdl(ifname)) == NULL) {
384		warnmsg(LOG_ERR, __func__,
385		    "failed to get link layer information for %s", ifname);
386		goto bad;
387	}
388	if (find_ifinfo(sdl->sdl_index)) {
389		warnmsg(LOG_ERR, __func__,
390		    "interface %s was already configured", ifname);
391		goto bad;
392	}
393
394	if (Fflag) {
395		struct in6_ndireq nd;
396		int s;
397
398		if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
399			warnmsg(LOG_ERR, __func__, "socket() failed.");
400			goto bad;
401		}
402		memset(&nd, 0, sizeof(nd));
403		strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
404		if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
405			warnmsg(LOG_ERR, __func__,
406			    "cannot get accept_rtadv flag");
407			(void)close(s);
408			goto bad;
409		}
410		nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
411		if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
412			warnmsg(LOG_ERR, __func__,
413			    "cannot set accept_rtadv flag");
414			(void)close(s);
415			goto bad;
416		}
417		(void)close(s);
418	}
419
420	if ((ifi = malloc(sizeof(*ifi))) == NULL) {
421		warnmsg(LOG_ERR, __func__, "memory allocation failed");
422		goto bad;
423	}
424	memset(ifi, 0, sizeof(*ifi));
425	ifi->sdl = sdl;
426	ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
427	ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
428	TAILQ_INIT(&ifi->ifi_rainfo);
429	strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
430
431	/* construct a router solicitation message */
432	if (make_packet(ifi))
433		goto bad;
434
435	/* set link ID of this interface. */
436#ifdef HAVE_SCOPELIB
437	if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
438		goto bad;
439#else
440	/* XXX: assume interface IDs as link IDs */
441	ifi->linkid = ifi->sdl->sdl_index;
442#endif
443
444	/*
445	 * check if the interface is available.
446	 * also check if SIOCGIFMEDIA ioctl is OK on the interface.
447	 */
448	ifi->mediareqok = 1;
449	ifi->active = interface_status(ifi);
450	if (!ifi->mediareqok) {
451		/*
452		 * probe routers periodically even if the link status
453		 * does not change.
454		 */
455		ifi->probeinterval = PROBE_INTERVAL;
456	}
457
458	/* activate interface: interface_up returns 0 on success */
459	flags = interface_up(ifi->ifname);
460	if (flags == 0)
461		ifi->state = IFS_DELAY;
462	else if (flags == IFS_TENTATIVE)
463		ifi->state = IFS_TENTATIVE;
464	else
465		ifi->state = IFS_DOWN;
466
467	rtsol_timer_update(ifi);
468
469	TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
470	return (0);
471
472bad:
473	free(sdl);
474	free(ifi);
475	return (-1);
476}
477
478struct rainfo *
479find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
480{
481	struct rainfo *rai;
482
483	TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
484		if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
485		    sizeof(rai->rai_saddr.sin6_addr)) == 0)
486			return (rai);
487
488	return (NULL);
489}
490
491struct ifinfo *
492find_ifinfo(int ifindex)
493{
494	struct ifinfo *ifi;
495
496	TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
497		if (ifi->sdl->sdl_index == ifindex)
498			return (ifi);
499	}
500	return (NULL);
501}
502
503static int
504make_packet(struct ifinfo *ifi)
505{
506	size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
507	struct nd_router_solicit *rs;
508	char *buf;
509
510	if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
511		warnmsg(LOG_INFO, __func__,
512		    "link-layer address option has null length"
513		    " on %s. Treat as not included.", ifi->ifname);
514	}
515	packlen += lladdroptlen;
516	ifi->rs_datalen = packlen;
517
518	/* allocate buffer */
519	if ((buf = malloc(packlen)) == NULL) {
520		warnmsg(LOG_ERR, __func__,
521		    "memory allocation failed for %s", ifi->ifname);
522		return (-1);
523	}
524	ifi->rs_data = buf;
525
526	/* fill in the message */
527	rs = (struct nd_router_solicit *)buf;
528	rs->nd_rs_type = ND_ROUTER_SOLICIT;
529	rs->nd_rs_code = 0;
530	rs->nd_rs_cksum = 0;
531	rs->nd_rs_reserved = 0;
532	buf += sizeof(*rs);
533
534	/* fill in source link-layer address option */
535	if (lladdroptlen)
536		lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
537
538	return (0);
539}
540
541static struct timespec *
542rtsol_check_timer(void)
543{
544	static struct timespec returnval;
545	struct timespec now, rtsol_timer;
546	struct ifinfo *ifi;
547	struct rainfo *rai;
548	struct ra_opt *rao, *raotmp;
549	int error, flags;
550
551	clock_gettime(CLOCK_MONOTONIC_FAST, &now);
552
553	rtsol_timer = tm_max;
554
555	TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
556		if (TS_CMP(&ifi->expire, &now, <=)) {
557			warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
558			    "state = %d", ifi->ifname, ifi->state);
559
560			while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
561				/* Remove all RA options. */
562				TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
563				while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
564				    NULL) {
565					TAILQ_REMOVE(&rai->rai_ra_opt, rao,
566					    rao_next);
567					if (rao->rao_msg != NULL)
568						free(rao->rao_msg);
569					free(rao);
570				}
571				free(rai);
572			}
573			switch (ifi->state) {
574			case IFS_DOWN:
575			case IFS_TENTATIVE:
576				/* interface_up returns 0 on success */
577				flags = interface_up(ifi->ifname);
578				if (flags == 0)
579					ifi->state = IFS_DELAY;
580				else if (flags == IFS_TENTATIVE)
581					ifi->state = IFS_TENTATIVE;
582				else
583					ifi->state = IFS_DOWN;
584				break;
585			case IFS_IDLE:
586			{
587				int oldstatus = ifi->active;
588				int probe = 0;
589
590				ifi->active = interface_status(ifi);
591
592				if (oldstatus != ifi->active) {
593					warnmsg(LOG_DEBUG, __func__,
594					    "%s status is changed"
595					    " from %d to %d",
596					    ifi->ifname,
597					    oldstatus, ifi->active);
598					probe = 1;
599					ifi->state = IFS_DELAY;
600				} else if (ifi->probeinterval &&
601				    (ifi->probetimer -=
602				    ifi->timer.tv_sec) <= 0) {
603					/* probe timer expired */
604					ifi->probetimer =
605					    ifi->probeinterval;
606					probe = 1;
607					ifi->state = IFS_PROBE;
608				}
609
610				/*
611				 * If we need a probe, clear the previous
612				 * status wrt the "managed/other" configuration.
613				 */
614				if (probe) {
615					ifi->managedconfig = 0;
616					ifi->otherconfig = 0;
617				}
618				if (probe && mobile_node) {
619					error = cap_probe_defrouters(capsendmsg,
620					    ifi);
621					if (error != 0)
622						warnmsg(LOG_DEBUG, __func__,
623					    "failed to probe routers: %d",
624						    error);
625				}
626				break;
627			}
628			case IFS_DELAY:
629				ifi->state = IFS_PROBE;
630				(void)cap_rssend(capsendmsg, ifi);
631				break;
632			case IFS_PROBE:
633				if (ifi->probes < MAX_RTR_SOLICITATIONS)
634					(void)cap_rssend(capsendmsg, ifi);
635				else {
636					warnmsg(LOG_INFO, __func__,
637					    "No answer after sending %d RSs",
638					    ifi->probes);
639					ifi->probes = 0;
640					ifi->state = IFS_IDLE;
641				}
642				break;
643			}
644			rtsol_timer_update(ifi);
645		} else {
646			/* Expiration check for RA options. */
647			int expire = 0;
648
649			TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
650				TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt,
651				    rao_next, raotmp) {
652					warnmsg(LOG_DEBUG, __func__,
653					    "RA expiration timer: "
654					    "type=%d, msg=%s, expire=%s",
655					    rao->rao_type, (char *)rao->rao_msg,
656						sec2str(&rao->rao_expire));
657					if (TS_CMP(&now, &rao->rao_expire,
658					    >=)) {
659						warnmsg(LOG_DEBUG, __func__,
660						    "RA expiration timer: "
661						    "expired.");
662						TAILQ_REMOVE(&rai->rai_ra_opt,
663						    rao, rao_next);
664						if (rao->rao_msg != NULL)
665							free(rao->rao_msg);
666						free(rao);
667						expire = 1;
668					}
669				}
670			}
671			if (expire)
672				ra_opt_handler(ifi);
673		}
674		if (TS_CMP(&ifi->expire, &rtsol_timer, <))
675			rtsol_timer = ifi->expire;
676	}
677
678	if (TS_CMP(&rtsol_timer, &tm_max, ==)) {
679		warnmsg(LOG_DEBUG, __func__, "there is no timer");
680		return (NULL);
681	} else if (TS_CMP(&rtsol_timer, &now, <))
682		/* this may occur when the interval is too small */
683		returnval.tv_sec = returnval.tv_nsec = 0;
684	else
685		TS_SUB(&rtsol_timer, &now, &returnval);
686
687	now.tv_sec += returnval.tv_sec;
688	now.tv_nsec += returnval.tv_nsec;
689	warnmsg(LOG_DEBUG, __func__, "New timer is %s",
690	    sec2str(&now));
691
692	return (&returnval);
693}
694
695void
696rtsol_timer_update(struct ifinfo *ifi)
697{
698#define MILLION 1000000
699#define DADRETRY 10		/* XXX: adhoc */
700	long interval;
701	struct timespec now;
702
703	bzero(&ifi->timer, sizeof(ifi->timer));
704
705	switch (ifi->state) {
706	case IFS_DOWN:
707	case IFS_TENTATIVE:
708		if (++ifi->dadcount > DADRETRY) {
709			ifi->dadcount = 0;
710			ifi->timer.tv_sec = PROBE_INTERVAL;
711		} else
712			ifi->timer.tv_sec = 1;
713		break;
714	case IFS_IDLE:
715		if (mobile_node)
716			/* XXX should be configurable */
717			ifi->timer.tv_sec = 3;
718		else
719			ifi->timer = tm_max;	/* stop timer(valid?) */
720		break;
721	case IFS_DELAY:
722		interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
723		ifi->timer.tv_sec = interval / MILLION;
724		ifi->timer.tv_nsec = (interval % MILLION) * 1000;
725		break;
726	case IFS_PROBE:
727		if (ifi->probes < MAX_RTR_SOLICITATIONS)
728			ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
729		else
730			/*
731			 * After sending MAX_RTR_SOLICITATIONS solicitations,
732			 * we're just waiting for possible replies; there
733			 * will be no more solicitation.  Thus, we change
734			 * the timer value to MAX_RTR_SOLICITATION_DELAY based
735			 * on RFC 2461, Section 6.3.7.
736			 */
737			ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
738		break;
739	default:
740		warnmsg(LOG_ERR, __func__,
741		    "illegal interface state(%d) on %s",
742		    ifi->state, ifi->ifname);
743		return;
744	}
745
746	/* reset the timer */
747	if (TS_CMP(&ifi->timer, &tm_max, ==)) {
748		ifi->expire = tm_max;
749		warnmsg(LOG_DEBUG, __func__,
750		    "stop timer for %s", ifi->ifname);
751	} else {
752		clock_gettime(CLOCK_MONOTONIC_FAST, &now);
753		TS_ADD(&now, &ifi->timer, &ifi->expire);
754
755		now.tv_sec += ifi->timer.tv_sec;
756		now.tv_nsec += ifi->timer.tv_nsec;
757		warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
758		    ifi->ifname, sec2str(&now));
759	}
760
761#undef MILLION
762}
763
764static void
765set_dumpfile(int sig __unused)
766{
767
768	do_dump = 1;
769}
770
771static void
772set_exit(int sig __unused)
773{
774
775	do_exit = 1;
776}
777
778static void
779usage(const char *progname)
780{
781
782	if (strcmp(progname, "rtsold") == 0) {
783		fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
784		    "[-p pidfile] [-R script-name] interface ...\n");
785		fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
786		    "[-p pidfile] [-R script-name] -a\n");
787	} else {
788		fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
789		    "[-p pidfile] [-R script-name] interface ...\n");
790		fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
791		    "[-p pidfile] [-R script-name] -a\n");
792	}
793	exit(1);
794}
795
796void
797warnmsg(int priority, const char *func, const char *msg, ...)
798{
799	va_list ap;
800	char buf[BUFSIZ];
801
802	va_start(ap, msg);
803	if (fflag) {
804		if (priority <= log_upto)
805			vwarnx(msg, ap);
806	} else {
807		snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
808		msg = buf;
809		cap_vsyslog(capsyslog, priority, msg, ap);
810	}
811	va_end(ap);
812}
813
814/*
815 * return a list of interfaces which is suitable to sending an RS.
816 */
817static char **
818autoifprobe(void)
819{
820	static char **argv = NULL;
821	static int n = 0;
822	char **a;
823	int s = 0, i, found;
824	struct ifaddrs *ifap, *ifa;
825	struct in6_ndireq nd;
826
827	/* initialize */
828	while (n--)
829		free(argv[n]);
830	if (argv) {
831		free(argv);
832		argv = NULL;
833	}
834	n = 0;
835
836	if (getifaddrs(&ifap) != 0)
837		return (NULL);
838
839	if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
840		warnmsg(LOG_ERR, __func__, "socket");
841		exit(1);
842	}
843
844	/* find an ethernet */
845	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
846		if ((ifa->ifa_flags & IFF_UP) == 0)
847			continue;
848		if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
849			continue;
850		if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
851			continue;
852		if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
853			continue;
854
855		if (ifa->ifa_addr->sa_family != AF_INET6)
856			continue;
857
858		found = 0;
859		for (i = 0; i < n; i++) {
860			if (strcmp(argv[i], ifa->ifa_name) == 0) {
861				found++;
862				break;
863			}
864		}
865		if (found)
866			continue;
867
868		/*
869		 * Skip the interfaces which IPv6 and/or accepting RA
870		 * is disabled.
871		 */
872		if (!Fflag) {
873			memset(&nd, 0, sizeof(nd));
874			strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
875			if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
876				warnmsg(LOG_ERR, __func__,
877					"ioctl(SIOCGIFINFO_IN6)");
878				exit(1);
879			}
880			if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
881				continue;
882			if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
883				continue;
884		}
885
886		/* if we find multiple candidates, just warn. */
887		if (n != 0 && dflag > 1)
888			warnmsg(LOG_WARNING, __func__,
889				"multiple interfaces found");
890
891		a = realloc(argv, (n + 1) * sizeof(char *));
892		if (a == NULL) {
893			warnmsg(LOG_ERR, __func__, "realloc");
894			exit(1);
895		}
896		argv = a;
897		argv[n] = strdup(ifa->ifa_name);
898		if (!argv[n]) {
899			warnmsg(LOG_ERR, __func__, "malloc");
900			exit(1);
901		}
902		n++;
903	}
904
905	if (n) {
906		a = realloc(argv, (n + 1) * sizeof(char *));
907		if (a == NULL) {
908			warnmsg(LOG_ERR, __func__, "realloc");
909			exit(1);
910		}
911		argv = a;
912		argv[n] = NULL;
913
914		if (dflag > 0) {
915			for (i = 0; i < n; i++)
916				warnmsg(LOG_WARNING, __func__, "probing %s",
917					argv[i]);
918		}
919	}
920	if (!Fflag)
921		close(s);
922	freeifaddrs(ifap);
923	return (argv);
924}
925