1/*	$KAME: mld6.c,v 1.15 2003/04/02 11:29:54 suz Exp $	*/
2
3/*
4 * Copyright (C) 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
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: releng/11.0/usr.sbin/mld6query/mld6.c 281143 2015-04-06 09:42:23Z glebius $");
34
35#include <sys/param.h>
36#include <sys/uio.h>
37#include <sys/socket.h>
38#include <sys/types.h>
39#include <sys/time.h>
40#include <ifaddrs.h>
41#include <unistd.h>
42#include <signal.h>
43
44#include <net/if.h>
45
46#include <netinet/in.h>
47#include <netinet/ip6.h>
48#include <netinet/icmp6.h>
49
50#include  <arpa/inet.h>
51
52#include <stdlib.h>
53#include <stdio.h>
54#include <string.h>
55#include <err.h>
56
57/* portability with older KAME headers */
58#ifndef MLD_LISTENER_QUERY
59#define MLD_LISTENER_QUERY	MLD6_LISTENER_QUERY
60#define MLD_LISTENER_REPORT	MLD6_LISTENER_REPORT
61#define MLD_LISTENER_DONE	MLD6_LISTENER_DONE
62#define MLD_MTRACE_RESP		MLD6_MTRACE_RESP
63#define MLD_MTRACE		MLD6_MTRACE
64#define mld_hdr		mld6_hdr
65#define mld_type	mld6_type
66#define mld_code	mld6_code
67#define mld_cksum	mld6_cksum
68#define mld_maxdelay	mld6_maxdelay
69#define mld_reserved	mld6_reserved
70#define mld_addr	mld6_addr
71#endif
72#ifndef IP6OPT_ROUTER_ALERT
73#define IP6OPT_ROUTER_ALERT	IP6OPT_RTALERT
74#endif
75
76struct msghdr m;
77struct sockaddr_in6 dst;
78struct mld_hdr mldh;
79struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT;
80struct ipv6_mreq mreq;
81u_short ifindex;
82int s;
83
84#define QUERY_RESPONSE_INTERVAL 10000
85
86void make_msg(int index, struct in6_addr *addr, u_int type);
87void usage(void);
88void dump(int);
89void quit(int);
90
91int
92main(int argc, char *argv[])
93{
94	int i;
95	struct icmp6_filter filt;
96	u_int hlim = 1;
97	fd_set fdset;
98	struct itimerval itimer;
99	u_int type;
100	int ch;
101
102	type = MLD_LISTENER_QUERY;
103	while ((ch = getopt(argc, argv, "dr")) != -1) {
104		switch (ch) {
105		case 'd':
106			type = MLD_LISTENER_DONE;
107			break;
108		case 'r':
109			type = MLD_LISTENER_REPORT;
110			break;
111		default:
112			usage();
113			/*NOTREACHED*/
114		}
115	}
116
117	argv += optind;
118	argc -= optind;
119
120	if (argc != 1 && argc != 2)
121		usage();
122
123	ifindex = (u_short)if_nametoindex(argv[0]);
124	if (ifindex == 0)
125		usage();
126	if (argc == 2 && inet_pton(AF_INET6, argv[1], &maddr) != 1)
127		usage();
128
129	if ((s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
130		err(1, "socket");
131
132	if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim,
133		       sizeof(hlim)) == -1)
134		err(1, "setsockopt(IPV6_MULTICAST_HOPS)");
135
136	mreq.ipv6mr_multiaddr = any;
137	mreq.ipv6mr_interface = ifindex;
138	if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
139		       sizeof(mreq)) == -1)
140		err(1, "setsockopt(IPV6_JOIN_GROUP)");
141
142	ICMP6_FILTER_SETBLOCKALL(&filt);
143	ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt);
144	ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt);
145	ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt);
146	if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
147			sizeof(filt)) < 0)
148		err(1, "setsockopt(ICMP6_FILTER)");
149
150	make_msg(ifindex, &maddr, type);
151
152	if (sendmsg(s, &m, 0) < 0)
153		err(1, "sendmsg");
154
155	itimer.it_value.tv_sec =  QUERY_RESPONSE_INTERVAL / 1000;
156	itimer.it_interval.tv_sec = 0;
157	itimer.it_interval.tv_usec = 0;
158	itimer.it_value.tv_usec = 0;
159
160	(void)signal(SIGALRM, quit);
161	(void)setitimer(ITIMER_REAL, &itimer, NULL);
162
163	FD_ZERO(&fdset);
164	if (s >= FD_SETSIZE)
165		errx(1, "descriptor too big");
166	for (;;) {
167		FD_SET(s, &fdset);
168		if ((i = select(s + 1, &fdset, NULL, NULL, NULL)) < 0)
169			perror("select");
170		if (i == 0)
171			continue;
172		else
173			dump(s);
174	}
175}
176
177void
178make_msg(int index, struct in6_addr *addr, u_int type)
179{
180	static struct iovec iov[2];
181	static u_char *cmsgbuf;
182	int cmsglen, hbhlen = 0;
183#ifdef USE_RFC2292BIS
184	void *hbhbuf = NULL, *optp = NULL;
185	int currentlen;
186#else
187	u_int8_t raopt[IP6OPT_RTALERT_LEN];
188#endif
189	struct in6_pktinfo *pi;
190	struct cmsghdr *cmsgp;
191	u_short rtalert_code = htons(IP6OPT_RTALERT_MLD);
192	struct ifaddrs *ifa, *ifap;
193	struct in6_addr src;
194
195	dst.sin6_len = sizeof(dst);
196	dst.sin6_family = AF_INET6;
197	if (IN6_IS_ADDR_UNSPECIFIED(addr)) {
198		if (inet_pton(AF_INET6, "ff02::1", &dst.sin6_addr) != 1)
199			errx(1, "inet_pton failed");
200	}
201	else
202		dst.sin6_addr = *addr;
203	m.msg_name = (caddr_t)&dst;
204	m.msg_namelen = dst.sin6_len;
205	iov[0].iov_base = (caddr_t)&mldh;
206	iov[0].iov_len = sizeof(mldh);
207	m.msg_iov = iov;
208	m.msg_iovlen = 1;
209
210	bzero(&mldh, sizeof(mldh));
211	mldh.mld_type = type & 0xff;
212	mldh.mld_maxdelay = htons(QUERY_RESPONSE_INTERVAL);
213	mldh.mld_addr = *addr;
214
215	/* MLD packet should be advertised from linklocal address */
216	getifaddrs(&ifa);
217	for (ifap = ifa; ifap; ifap = ifap->ifa_next) {
218		if (index != if_nametoindex(ifap->ifa_name))
219			continue;
220
221		if (ifap->ifa_addr->sa_family != AF_INET6)
222			continue;
223		if (!IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)
224					    ifap->ifa_addr)->sin6_addr))
225			continue;
226		break;
227	}
228	if (ifap == NULL)
229		errx(1, "no linkocal address is available");
230	memcpy(&src, &((struct sockaddr_in6 *)ifap->ifa_addr)->sin6_addr,
231	       sizeof(src));
232	freeifaddrs(ifa);
233#ifdef __KAME__
234	/* remove embedded ifindex */
235	src.s6_addr[2] = src.s6_addr[3] = 0;
236#endif
237
238#ifdef USE_RFC2292BIS
239	if ((hbhlen = inet6_opt_init(NULL, 0)) == -1)
240		errx(1, "inet6_opt_init(0) failed");
241	if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2,
242				       2, NULL)) == -1)
243		errx(1, "inet6_opt_append(0) failed");
244	if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1)
245		errx(1, "inet6_opt_finish(0) failed");
246	cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(hbhlen);
247#else
248	hbhlen = sizeof(raopt);
249	cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
250	    inet6_option_space(hbhlen);
251#endif
252
253	if ((cmsgbuf = malloc(cmsglen)) == NULL)
254		errx(1, "can't allocate enough memory for cmsg");
255	cmsgp = (struct cmsghdr *)cmsgbuf;
256	m.msg_control = (caddr_t)cmsgbuf;
257	m.msg_controllen = cmsglen;
258	/* specify the outgoing interface */
259	cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
260	cmsgp->cmsg_level = IPPROTO_IPV6;
261	cmsgp->cmsg_type = IPV6_PKTINFO;
262	pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
263	pi->ipi6_ifindex = index;
264	memcpy(&pi->ipi6_addr, &src, sizeof(pi->ipi6_addr));
265	/* specifiy to insert router alert option in a hop-by-hop opt hdr. */
266	cmsgp = CMSG_NXTHDR(&m, cmsgp);
267#ifdef USE_RFC2292BIS
268	cmsgp->cmsg_len = CMSG_LEN(hbhlen);
269	cmsgp->cmsg_level = IPPROTO_IPV6;
270	cmsgp->cmsg_type = IPV6_HOPOPTS;
271	hbhbuf = CMSG_DATA(cmsgp);
272	if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1)
273		errx(1, "inet6_opt_init(len = %d) failed", hbhlen);
274	if ((currentlen = inet6_opt_append(hbhbuf, hbhlen, currentlen,
275					   IP6OPT_ROUTER_ALERT, 2,
276					   2, &optp)) == -1)
277		errx(1, "inet6_opt_append(currentlen = %d, hbhlen = %d) failed",
278		     currentlen, hbhlen);
279	(void)inet6_opt_set_val(optp, 0, &rtalert_code, sizeof(rtalert_code));
280	if ((currentlen = inet6_opt_finish(hbhbuf, hbhlen, currentlen)) == -1)
281		errx(1, "inet6_opt_finish(buf) failed");
282#else  /* old advanced API */
283	if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS))
284		errx(1, "inet6_option_init failed\n");
285	raopt[0] = IP6OPT_ROUTER_ALERT;
286	raopt[1] = IP6OPT_RTALERT_LEN - 2;
287	memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short));
288	if (inet6_option_append(cmsgp, raopt, 4, 0))
289		errx(1, "inet6_option_append failed\n");
290#endif
291}
292
293void
294dump(int s)
295{
296	int i;
297	struct mld_hdr *mld;
298	u_char buf[1024];
299	struct sockaddr_in6 from;
300	int from_len = sizeof(from);
301	char ntop_buf[256];
302
303	if ((i = recvfrom(s, buf, sizeof(buf), 0,
304			  (struct sockaddr *)&from,
305			  &from_len)) < 0)
306		return;
307
308	if (i < sizeof(struct mld_hdr)) {
309		printf("too short!\n");
310		return;
311	}
312
313	mld = (struct mld_hdr *)buf;
314
315	printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr,
316				      ntop_buf, sizeof(ntop_buf)));
317
318	switch (mld->mld_type) {
319	case ICMP6_MEMBERSHIP_QUERY:
320		printf("type=Multicast Listener Query, ");
321		break;
322	case ICMP6_MEMBERSHIP_REPORT:
323		printf("type=Multicast Listener Report, ");
324		break;
325	case ICMP6_MEMBERSHIP_REDUCTION:
326		printf("type=Multicast Listener Done, ");
327		break;
328	}
329	printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld_addr,
330				    ntop_buf, sizeof(ntop_buf)));
331
332	fflush(stdout);
333}
334
335void
336quit(int signum __unused)
337{
338	mreq.ipv6mr_multiaddr = any;
339	mreq.ipv6mr_interface = ifindex;
340	if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
341		       sizeof(mreq)) == -1)
342		err(1, "setsockopt(IPV6_LEAVE_GROUP)");
343
344	exit(0);
345}
346
347void
348usage(void)
349{
350	(void)fprintf(stderr, "usage: mld6query ifname [addr]\n");
351	exit(1);
352}
353