mld6.c revision 121472 
1/*	$KAME: mld6.c,v 1.15 2003/04/02 11:29:54 suz Exp $	*/
2/*	$FreeBSD: head/usr.sbin/mld6query/mld6.c 121472 2003-10-24 18:26:30Z ume $	*/
3
4/*
5 * Copyright (C) 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32#include <sys/param.h>
33#include <sys/uio.h>
34#include <sys/socket.h>
35#include <sys/types.h>
36#include <sys/time.h>
37#include <ifaddrs.h>
38#include <unistd.h>
39#include <signal.h>
40
41#include <net/if.h>
42#include <net/if_var.h>
43
44#include <netinet/in.h>
45#include <netinet/ip6.h>
46#include <netinet/icmp6.h>
47
48#include  <arpa/inet.h>
49
50#include <stdlib.h>
51#include <stdio.h>
52#include <string.h>
53#include <err.h>
54
55/* portability with older KAME headers */
56#ifndef MLD_LISTENER_QUERY
57#define MLD_LISTENER_QUERY	MLD6_LISTENER_QUERY
58#define MLD_LISTENER_REPORT	MLD6_LISTENER_REPORT
59#define MLD_LISTENER_DONE	MLD6_LISTENER_DONE
60#define MLD_MTRACE_RESP		MLD6_MTRACE_RESP
61#define MLD_MTRACE		MLD6_MTRACE
62#define mld_hdr		mld6_hdr
63#define mld_type	mld6_type
64#define mld_code	mld6_code
65#define mld_cksum	mld6_cksum
66#define mld_maxdelay	mld6_maxdelay
67#define mld_reserved	mld6_reserved
68#define mld_addr	mld6_addr
69#endif
70#ifndef IP6OPT_ROUTER_ALERT
71#define IP6OPT_ROUTER_ALERT	IP6OPT_RTALERT
72#endif
73
74struct msghdr m;
75struct sockaddr_in6 dst;
76struct mld_hdr mldh;
77struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT;
78struct ipv6_mreq mreq;
79u_short ifindex;
80int s;
81
82#define QUERY_RESPONSE_INTERVAL 10000
83
84void make_msg(int index, struct in6_addr *addr, u_int type);
85void usage(void);
86void dump(int);
87void quit(int);
88
89int
90main(int argc, char *argv[])
91{
92	int i;
93	struct icmp6_filter filt;
94	u_int hlim = 1;
95	fd_set fdset;
96	struct itimerval itimer;
97	u_int type;
98	int ch;
99
100	type = MLD_LISTENER_QUERY;
101	while ((ch = getopt(argc, argv, "dr")) != -1) {
102		switch (ch) {
103		case 'd':
104			type = MLD_LISTENER_DONE;
105			break;
106		case 'r':
107			type = MLD_LISTENER_REPORT;
108			break;
109		default:
110			usage();
111			/*NOTREACHED*/
112		}
113	}
114
115	argv += optind;
116	argc -= optind;
117
118	if (argc != 1 && argc != 2)
119		usage();
120
121	ifindex = (u_short)if_nametoindex(argv[0]);
122	if (ifindex == 0)
123		usage();
124	if (argc == 2 && inet_pton(AF_INET6, argv[1], &maddr) != 1)
125		usage();
126
127	if ((s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
128		err(1, "socket");
129
130	if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim,
131		       sizeof(hlim)) == -1)
132		err(1, "setsockopt(IPV6_MULTICAST_HOPS)");
133
134	mreq.ipv6mr_multiaddr = any;
135	mreq.ipv6mr_interface = ifindex;
136	if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
137		       sizeof(mreq)) == -1)
138		err(1, "setsockopt(IPV6_JOIN_GROUP)");
139
140	ICMP6_FILTER_SETBLOCKALL(&filt);
141	ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt);
142	ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt);
143	ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt);
144	if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
145			sizeof(filt)) < 0)
146		err(1, "setsockopt(ICMP6_FILTER)");
147
148	make_msg(ifindex, &maddr, type);
149
150	if (sendmsg(s, &m, 0) < 0)
151		err(1, "sendmsg");
152
153	itimer.it_value.tv_sec =  QUERY_RESPONSE_INTERVAL / 1000;
154	itimer.it_interval.tv_sec = 0;
155	itimer.it_interval.tv_usec = 0;
156	itimer.it_value.tv_usec = 0;
157
158	(void)signal(SIGALRM, quit);
159	(void)setitimer(ITIMER_REAL, &itimer, NULL);
160
161	FD_ZERO(&fdset);
162	if (s >= FD_SETSIZE)
163		errx(1, "descriptor too big");
164	for (;;) {
165		FD_SET(s, &fdset);
166		if ((i = select(s + 1, &fdset, NULL, NULL, NULL)) < 0)
167			perror("select");
168		if (i == 0)
169			continue;
170		else
171			dump(s);
172	}
173}
174
175void
176make_msg(int index, struct in6_addr *addr, u_int type)
177{
178	static struct iovec iov[2];
179	static u_char *cmsgbuf;
180	int cmsglen, hbhlen = 0;
181#ifdef USE_RFC2292BIS
182	void *hbhbuf = NULL, *optp = NULL;
183	int currentlen;
184#else
185	u_int8_t raopt[IP6OPT_RTALERT_LEN];
186#endif
187	struct in6_pktinfo *pi;
188	struct cmsghdr *cmsgp;
189	u_short rtalert_code = htons(IP6OPT_RTALERT_MLD);
190	struct ifaddrs *ifa, *ifap;
191	struct in6_addr src;
192
193	dst.sin6_len = sizeof(dst);
194	dst.sin6_family = AF_INET6;
195	if (IN6_IS_ADDR_UNSPECIFIED(addr)) {
196		if (inet_pton(AF_INET6, "ff02::1", &dst.sin6_addr) != 1)
197			errx(1, "inet_pton failed");
198	}
199	else
200		dst.sin6_addr = *addr;
201	m.msg_name = (caddr_t)&dst;
202	m.msg_namelen = dst.sin6_len;
203	iov[0].iov_base = (caddr_t)&mldh;
204	iov[0].iov_len = sizeof(mldh);
205	m.msg_iov = iov;
206	m.msg_iovlen = 1;
207
208	bzero(&mldh, sizeof(mldh));
209	mldh.mld_type = type & 0xff;
210	mldh.mld_maxdelay = htons(QUERY_RESPONSE_INTERVAL);
211	mldh.mld_addr = *addr;
212
213	/* MLD packet should be advertised from linklocal address */
214	getifaddrs(&ifa);
215	for (ifap = ifa; ifap; ifap = ifap->ifa_next) {
216		if (index != if_nametoindex(ifap->ifa_name))
217			continue;
218
219		if (ifap->ifa_addr->sa_family != AF_INET6)
220			continue;
221		if (!IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)
222					    ifap->ifa_addr)->sin6_addr))
223			continue;
224		break;
225	}
226	if (ifap == NULL)
227		errx(1, "no linkocal address is available");
228	memcpy(&src, &((struct sockaddr_in6 *)ifap->ifa_addr)->sin6_addr,
229	       sizeof(src));
230	freeifaddrs(ifa);
231#ifdef __KAME__
232	/* remove embedded ifindex */
233	src.s6_addr[2] = src.s6_addr[3] = 0;
234#endif
235
236#ifdef USE_RFC2292BIS
237	if ((hbhlen = inet6_opt_init(NULL, 0)) == -1)
238		errx(1, "inet6_opt_init(0) failed");
239	if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2,
240				       2, NULL)) == -1)
241		errx(1, "inet6_opt_append(0) failed");
242	if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1)
243		errx(1, "inet6_opt_finish(0) failed");
244	cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(hbhlen);
245#else
246	hbhlen = sizeof(raopt);
247	cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
248	    inet6_option_space(hbhlen);
249#endif
250
251	if ((cmsgbuf = malloc(cmsglen)) == NULL)
252		errx(1, "can't allocate enough memory for cmsg");
253	cmsgp = (struct cmsghdr *)cmsgbuf;
254	m.msg_control = (caddr_t)cmsgbuf;
255	m.msg_controllen = cmsglen;
256	/* specify the outgoing interface */
257	cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
258	cmsgp->cmsg_level = IPPROTO_IPV6;
259	cmsgp->cmsg_type = IPV6_PKTINFO;
260	pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
261	pi->ipi6_ifindex = index;
262	memcpy(&pi->ipi6_addr, &src, sizeof(pi->ipi6_addr));
263	/* specifiy to insert router alert option in a hop-by-hop opt hdr. */
264	cmsgp = CMSG_NXTHDR(&m, cmsgp);
265#ifdef USE_RFC2292BIS
266	cmsgp->cmsg_len = CMSG_LEN(hbhlen);
267	cmsgp->cmsg_level = IPPROTO_IPV6;
268	cmsgp->cmsg_type = IPV6_HOPOPTS;
269	hbhbuf = CMSG_DATA(cmsgp);
270	if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1)
271		errx(1, "inet6_opt_init(len = %d) failed", hbhlen);
272	if ((currentlen = inet6_opt_append(hbhbuf, hbhlen, currentlen,
273					   IP6OPT_ROUTER_ALERT, 2,
274					   2, &optp)) == -1)
275		errx(1, "inet6_opt_append(currentlen = %d, hbhlen = %d) failed",
276		     currentlen, hbhlen);
277	(void)inet6_opt_set_val(optp, 0, &rtalert_code, sizeof(rtalert_code));
278	if ((currentlen = inet6_opt_finish(hbhbuf, hbhlen, currentlen)) == -1)
279		errx(1, "inet6_opt_finish(buf) failed");
280#else  /* old advanced API */
281	if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS))
282		errx(1, "inet6_option_init failed\n");
283	raopt[0] = IP6OPT_ROUTER_ALERT;
284	raopt[1] = IP6OPT_RTALERT_LEN - 2;
285	memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short));
286	if (inet6_option_append(cmsgp, raopt, 4, 0))
287		errx(1, "inet6_option_append failed\n");
288#endif
289}
290
291void
292dump(int s)
293{
294	int i;
295	struct mld_hdr *mld;
296	u_char buf[1024];
297	struct sockaddr_in6 from;
298	int from_len = sizeof(from);
299	char ntop_buf[256];
300
301	if ((i = recvfrom(s, buf, sizeof(buf), 0,
302			  (struct sockaddr *)&from,
303			  &from_len)) < 0)
304		return;
305
306	if (i < sizeof(struct mld_hdr)) {
307		printf("too short!\n");
308		return;
309	}
310
311	mld = (struct mld_hdr *)buf;
312
313	printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr,
314				      ntop_buf, sizeof(ntop_buf)));
315
316	switch (mld->mld_type) {
317	case ICMP6_MEMBERSHIP_QUERY:
318		printf("type=Multicast Listener Query, ");
319		break;
320	case ICMP6_MEMBERSHIP_REPORT:
321		printf("type=Multicast Listener Report, ");
322		break;
323	case ICMP6_MEMBERSHIP_REDUCTION:
324		printf("type=Multicast Listener Done, ");
325		break;
326	}
327	printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld_addr,
328				    ntop_buf, sizeof(ntop_buf)));
329
330	fflush(stdout);
331}
332
333/* ARGSUSED */
334void
335quit(int signum)
336{
337	mreq.ipv6mr_multiaddr = any;
338	mreq.ipv6mr_interface = ifindex;
339	if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
340		       sizeof(mreq)) == -1)
341		err(1, "setsockopt(IPV6_LEAVE_GROUP)");
342
343	exit(0);
344}
345
346void
347usage()
348{
349	(void)fprintf(stderr, "usage: mld6query ifname [addr]\n");
350	exit(1);
351}
352