1/*	$KAME: mld6.c,v 1.15 2003/04/02 11:29:54 suz Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (C) 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
34#include <sys/param.h>
35#include <sys/uio.h>
36#include <sys/socket.h>
37#include <sys/types.h>
38#include <sys/time.h>
39#include <ifaddrs.h>
40#include <unistd.h>
41#include <signal.h>
42
43#include <net/if.h>
44
45#include <netinet/in.h>
46#include <netinet/ip6.h>
47#include <netinet/icmp6.h>
48
49#include  <arpa/inet.h>
50
51#include <stdlib.h>
52#include <stdio.h>
53#include <string.h>
54#include <err.h>
55
56/* portability with older KAME headers */
57#ifndef MLD_LISTENER_QUERY
58#define MLD_LISTENER_QUERY	MLD6_LISTENER_QUERY
59#define MLD_LISTENER_REPORT	MLD6_LISTENER_REPORT
60#define MLD_LISTENER_DONE	MLD6_LISTENER_DONE
61#define MLD_MTRACE_RESP		MLD6_MTRACE_RESP
62#define MLD_MTRACE		MLD6_MTRACE
63#define mld_hdr		mld6_hdr
64#define mld_type	mld6_type
65#define mld_code	mld6_code
66#define mld_cksum	mld6_cksum
67#define mld_maxdelay	mld6_maxdelay
68#define mld_reserved	mld6_reserved
69#define mld_addr	mld6_addr
70#endif
71#ifndef IP6OPT_ROUTER_ALERT
72#define IP6OPT_ROUTER_ALERT	IP6OPT_RTALERT
73#endif
74
75struct msghdr m;
76struct sockaddr_in6 dst;
77struct mld_hdr mldh;
78struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT;
79struct ipv6_mreq mreq;
80u_short ifindex;
81int s;
82
83#define QUERY_RESPONSE_INTERVAL 10000
84
85void make_msg(int index, struct in6_addr *addr, u_int type, struct in6_addr *qaddr);
86void usage(void);
87void dump(int);
88void quit(int);
89
90int
91main(int argc, char *argv[])
92{
93	int i;
94	struct icmp6_filter filt;
95	u_int hlim = 1;
96	fd_set fdset;
97	struct itimerval itimer;
98	u_int type;
99	int ch;
100	struct in6_addr *qaddr = &maddr;
101
102	type = MLD_LISTENER_QUERY;
103	while ((ch = getopt(argc, argv, "dgr")) != -1) {
104		switch (ch) {
105		case 'd':
106			if (type != MLD_LISTENER_QUERY) {
107				printf("Can not specify -d with -r\n");
108				return 1;
109			}
110			type = MLD_LISTENER_DONE;
111			break;
112		case 'g':
113			qaddr = &any;
114			break;
115		case 'r':
116			if (type != MLD_LISTENER_QUERY) {
117				printf("Can not specify -r with -d\n");
118				return 1;
119			}
120			type = MLD_LISTENER_REPORT;
121			break;
122		default:
123			usage();
124			/*NOTREACHED*/
125		}
126	}
127
128	argv += optind;
129	argc -= optind;
130
131	if (argc != 1 && argc != 2)
132		usage();
133
134	ifindex = (u_short)if_nametoindex(argv[0]);
135	if (ifindex == 0)
136		usage();
137	if (argc == 2 && inet_pton(AF_INET6, argv[1], &maddr) != 1)
138		usage();
139	if (type != MLD_LISTENER_QUERY && qaddr != &maddr) {
140		printf("Can not specify -g with -d or -r\n");
141		return 1;
142	}
143
144	if ((s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
145		err(1, "socket");
146
147	if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim,
148		       sizeof(hlim)) == -1)
149		err(1, "setsockopt(IPV6_MULTICAST_HOPS)");
150
151	if (IN6_IS_ADDR_UNSPECIFIED(&maddr)) {
152		if (inet_pton(AF_INET6, "ff02::1", &maddr) != 1)
153			errx(1, "inet_pton failed");
154	}
155
156	mreq.ipv6mr_multiaddr = maddr;
157	mreq.ipv6mr_interface = ifindex;
158	if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
159		       sizeof(mreq)) == -1)
160		err(1, "setsockopt(IPV6_JOIN_GROUP)");
161
162	ICMP6_FILTER_SETBLOCKALL(&filt);
163	ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt);
164	ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt);
165	ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt);
166	if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
167			sizeof(filt)) < 0)
168		err(1, "setsockopt(ICMP6_FILTER)");
169
170	make_msg(ifindex, &maddr, type, qaddr);
171
172	if (sendmsg(s, &m, 0) < 0)
173		err(1, "sendmsg");
174
175	itimer.it_value.tv_sec =  QUERY_RESPONSE_INTERVAL / 1000;
176	itimer.it_interval.tv_sec = 0;
177	itimer.it_interval.tv_usec = 0;
178	itimer.it_value.tv_usec = 0;
179
180	(void)signal(SIGALRM, quit);
181	(void)setitimer(ITIMER_REAL, &itimer, NULL);
182
183	FD_ZERO(&fdset);
184	if (s >= FD_SETSIZE)
185		errx(1, "descriptor too big");
186	for (;;) {
187		FD_SET(s, &fdset);
188		if ((i = select(s + 1, &fdset, NULL, NULL, NULL)) < 0)
189			perror("select");
190		if (i == 0)
191			continue;
192		else
193			dump(s);
194	}
195}
196
197void
198make_msg(int index, struct in6_addr *addr, u_int type, struct in6_addr *qaddr)
199{
200	static struct iovec iov[2];
201	static u_char *cmsgbuf;
202	int cmsglen, hbhlen = 0;
203	void *hbhbuf = NULL, *optp = NULL;
204	int currentlen;
205	struct in6_pktinfo *pi;
206	struct cmsghdr *cmsgp;
207	u_short rtalert_code = htons(IP6OPT_RTALERT_MLD);
208	struct ifaddrs *ifa, *ifap;
209	struct in6_addr src;
210
211	dst.sin6_len = sizeof(dst);
212	dst.sin6_family = AF_INET6;
213	dst.sin6_addr = *addr;
214	m.msg_name = (caddr_t)&dst;
215	m.msg_namelen = dst.sin6_len;
216	iov[0].iov_base = (caddr_t)&mldh;
217	iov[0].iov_len = sizeof(mldh);
218	m.msg_iov = iov;
219	m.msg_iovlen = 1;
220
221	bzero(&mldh, sizeof(mldh));
222	mldh.mld_type = type & 0xff;
223	mldh.mld_maxdelay = htons(QUERY_RESPONSE_INTERVAL);
224	mldh.mld_addr = *qaddr;
225
226	/* MLD packet should be advertised from linklocal address */
227	getifaddrs(&ifa);
228	for (ifap = ifa; ifap; ifap = ifap->ifa_next) {
229		if (index != if_nametoindex(ifap->ifa_name))
230			continue;
231
232		if (ifap->ifa_addr->sa_family != AF_INET6)
233			continue;
234		if (!IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)
235					    ifap->ifa_addr)->sin6_addr))
236			continue;
237		break;
238	}
239	if (ifap == NULL)
240		errx(1, "no linklocal address is available");
241	memcpy(&src, &((struct sockaddr_in6 *)ifap->ifa_addr)->sin6_addr,
242	       sizeof(src));
243	freeifaddrs(ifa);
244#ifdef __KAME__
245	/* remove embedded ifindex */
246	src.s6_addr[2] = src.s6_addr[3] = 0;
247#endif
248
249	if ((hbhlen = inet6_opt_init(NULL, 0)) == -1)
250		errx(1, "inet6_opt_init(0) failed");
251	if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2,
252				       2, NULL)) == -1)
253		errx(1, "inet6_opt_append(0) failed");
254	if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1)
255		errx(1, "inet6_opt_finish(0) failed");
256	cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(hbhlen);
257
258	if ((cmsgbuf = malloc(cmsglen)) == NULL)
259		errx(1, "can't allocate enough memory for cmsg");
260	cmsgp = (struct cmsghdr *)cmsgbuf;
261	m.msg_control = (caddr_t)cmsgbuf;
262	m.msg_controllen = cmsglen;
263	/* specify the outgoing interface */
264	cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
265	cmsgp->cmsg_level = IPPROTO_IPV6;
266	cmsgp->cmsg_type = IPV6_PKTINFO;
267	pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
268	pi->ipi6_ifindex = index;
269	memcpy(&pi->ipi6_addr, &src, sizeof(pi->ipi6_addr));
270	/* specify to insert router alert option in a hop-by-hop opt hdr. */
271	cmsgp = CMSG_NXTHDR(&m, cmsgp);
272	cmsgp->cmsg_len = CMSG_LEN(hbhlen);
273	cmsgp->cmsg_level = IPPROTO_IPV6;
274	cmsgp->cmsg_type = IPV6_HOPOPTS;
275	hbhbuf = CMSG_DATA(cmsgp);
276	if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1)
277		errx(1, "inet6_opt_init(len = %d) failed", hbhlen);
278	if ((currentlen = inet6_opt_append(hbhbuf, hbhlen, currentlen,
279					   IP6OPT_ROUTER_ALERT, 2,
280					   2, &optp)) == -1)
281		errx(1, "inet6_opt_append(currentlen = %d, hbhlen = %d) failed",
282		     currentlen, hbhlen);
283	(void)inet6_opt_set_val(optp, 0, &rtalert_code, sizeof(rtalert_code));
284	if ((currentlen = inet6_opt_finish(hbhbuf, hbhlen, currentlen)) == -1)
285		errx(1, "inet6_opt_finish(buf) failed");
286}
287
288void
289dump(int s)
290{
291	int i;
292	struct mld_hdr *mld;
293	u_char buf[1024];
294	struct sockaddr_in6 from;
295	int from_len = sizeof(from);
296	char ntop_buf[256];
297
298	if ((i = recvfrom(s, buf, sizeof(buf), 0,
299			  (struct sockaddr *)&from,
300			  &from_len)) < 0)
301		return;
302
303	if (i < sizeof(struct mld_hdr)) {
304		printf("too short!\n");
305		return;
306	}
307
308	mld = (struct mld_hdr *)buf;
309
310	printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr,
311				      ntop_buf, sizeof(ntop_buf)));
312
313	switch (mld->mld_type) {
314	case ICMP6_MEMBERSHIP_QUERY:
315		printf("type=Multicast Listener Query, ");
316		break;
317	case ICMP6_MEMBERSHIP_REPORT:
318		printf("type=Multicast Listener Report, ");
319		break;
320	case ICMP6_MEMBERSHIP_REDUCTION:
321		printf("type=Multicast Listener Done, ");
322		break;
323	}
324	printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld_addr,
325				    ntop_buf, sizeof(ntop_buf)));
326
327	fflush(stdout);
328}
329
330void
331quit(int signum __unused)
332{
333	mreq.ipv6mr_multiaddr = maddr;
334	mreq.ipv6mr_interface = ifindex;
335	if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
336		       sizeof(mreq)) == -1)
337		err(1, "setsockopt(IPV6_LEAVE_GROUP)");
338
339	exit(0);
340}
341
342void
343usage(void)
344{
345	(void)fprintf(stderr, "usage: mld6query [-dgr] ifname [addr]\n");
346	exit(1);
347}
348