xref: /freebsd/usr.sbin/mld6query/mld6.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*	$KAME: mld6.c,v 1.15 2003/04/02 11:29:54 suz Exp $	*/
2 /*	$FreeBSD$	*/
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 
74 struct msghdr m;
75 struct sockaddr_in6 dst;
76 struct mld_hdr mldh;
77 struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT;
78 struct ipv6_mreq mreq;
79 u_short ifindex;
80 int s;
81 
82 #define QUERY_RESPONSE_INTERVAL 10000
83 
84 void make_msg(int index, struct in6_addr *addr, u_int type);
85 void usage(void);
86 void dump(int);
87 void quit(int);
88 
89 int
90 main(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 
175 void
176 make_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 
291 void
292 dump(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 */
334 void
335 quit(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 
346 void
347 usage()
348 {
349 	(void)fprintf(stderr, "usage: mld6query ifname [addr]\n");
350 	exit(1);
351 }
352