1 /* $NetBSD: mld6.c,v 1.2 1999/09/03 04:34:34 itojun 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 #include <sys/param.h> 32 #include <sys/uio.h> 33 #include <sys/socket.h> 34 #include <sys/types.h> 35 #include <sys/time.h> 36 #include <unistd.h> 37 #include <signal.h> 38 39 #include <net/if.h> 40 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 41 #include <net/if_var.h> 42 #endif /* __FreeBSD__ >= 3 */ 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 struct msghdr m; 56 struct sockaddr_in6 dst; 57 struct mld6_hdr mldh; 58 struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT; 59 struct ipv6_mreq mreq; 60 u_short ifindex; 61 int s; 62 63 #define QUERY_RESPONSE_INTERVAL 10000 64 65 void make_msg(int index, struct in6_addr *addr, u_int type); 66 void usage(void); 67 void dump(int); 68 void quit(int); 69 70 int 71 main(int argc, char *argv[]) 72 { 73 int i; 74 struct icmp6_filter filt; 75 u_int hlim = 1; 76 fd_set fdset; 77 struct itimerval itimer; 78 u_int type; 79 int ch; 80 extern int optind; 81 82 type = MLD6_LISTENER_QUERY; 83 while ((ch = getopt(argc, argv, "d")) != EOF) { 84 switch (ch) { 85 case 'd': 86 type = MLD6_LISTENER_DONE; 87 break; 88 case 'r': 89 type = MLD6_LISTENER_REPORT; 90 break; 91 default: 92 usage(); 93 /*NOTREACHED*/ 94 } 95 } 96 97 argv += optind; 98 argc -= optind; 99 100 if (argc != 1 && argc != 2) 101 usage(); 102 103 ifindex = (u_short)if_nametoindex(argv[0]); 104 if (ifindex == 0) 105 usage(); 106 if (argc == 3 && inet_pton(AF_INET6, argv[1], &maddr) != 1) 107 usage(); 108 109 if ((s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) 110 err(1, "socket"); 111 112 if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim, 113 sizeof(hlim)) == -1) 114 err(1, "setsockopt(IPV6_MULTICAST_HOPS)"); 115 116 mreq.ipv6mr_multiaddr = any; 117 mreq.ipv6mr_interface = ifindex; 118 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, 119 sizeof(mreq)) == -1) 120 err(1, "setsockopt(IPV6_JOIN_GROUP)"); 121 122 ICMP6_FILTER_SETBLOCKALL(&filt); 123 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt); 124 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt); 125 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt); 126 if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, 127 sizeof(filt)) < 0) 128 err(1, "setsockopt(ICMP6_FILTER)"); 129 130 make_msg(ifindex, &maddr, type); 131 132 if (sendmsg(s, &m, 0) < 0) 133 err(1, "sendmsg"); 134 135 itimer.it_value.tv_sec = QUERY_RESPONSE_INTERVAL / 1000; 136 itimer.it_interval.tv_sec = 0; 137 itimer.it_interval.tv_usec = 0; 138 itimer.it_value.tv_usec = 0; 139 140 (void)signal(SIGALRM, quit); 141 (void)setitimer(ITIMER_REAL, &itimer, NULL); 142 143 FD_ZERO(&fdset); 144 for (;;) { 145 FD_SET(s, &fdset); 146 if ((i = select(s + 1, &fdset, NULL, NULL, NULL)) < 0) 147 perror("select"); 148 if (i == 0) 149 continue; 150 else 151 dump(s); 152 } 153 } 154 155 void 156 make_msg(int index, struct in6_addr *addr, u_int type) 157 { 158 static struct iovec iov[2]; 159 static u_char *cmsgbuf; 160 int cmsglen; 161 u_int8_t raopt[IP6OPT_RTALERT_LEN]; 162 struct in6_pktinfo *pi; 163 struct cmsghdr *cmsgp; 164 u_short rtalert_code = htons(IP6OPT_RTALERT_MLD); 165 166 dst.sin6_len = sizeof(dst); 167 dst.sin6_family = AF_INET6; 168 if (IN6_IS_ADDR_UNSPECIFIED(addr)) { 169 if (inet_pton(AF_INET6, "ff02::1", &dst.sin6_addr) != 1) 170 errx(1, "inet_pton failed"); 171 } 172 else 173 dst.sin6_addr = *addr; 174 m.msg_name = (caddr_t)&dst; 175 m.msg_namelen = dst.sin6_len; 176 iov[0].iov_base = (caddr_t)&mldh; 177 iov[0].iov_len = sizeof(mldh); 178 m.msg_iov = iov; 179 m.msg_iovlen = 1; 180 181 bzero(&mldh, sizeof(mldh)); 182 mldh.mld6_type = type & 0xff; 183 mldh.mld6_maxdelay = htons(QUERY_RESPONSE_INTERVAL); 184 mldh.mld6_addr = *addr; 185 186 cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 187 inet6_option_space(sizeof(raopt)); 188 if ((cmsgbuf = malloc(cmsglen)) == NULL) 189 errx(1, "can't allocate enough memory for cmsg"); 190 cmsgp = (struct cmsghdr *)cmsgbuf; 191 m.msg_control = (caddr_t)cmsgbuf; 192 m.msg_controllen = cmsglen; 193 /* specify the outgoing interface */ 194 cmsgp->cmsg_len = CMSG_SPACE(sizeof(struct in6_pktinfo)); 195 cmsgp->cmsg_level = IPPROTO_IPV6; 196 cmsgp->cmsg_type = IPV6_PKTINFO; 197 pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp); 198 pi->ipi6_ifindex = ifindex; 199 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); 200 /* specifiy to insert router alert option in a hop-by-hop opt hdr. */ 201 cmsgp = CMSG_NXTHDR(&m, cmsgp); 202 if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS)) 203 errx(1, "inet6_option_init failed\n"); 204 raopt[0] = IP6OPT_RTALERT; 205 raopt[1] = IP6OPT_RTALERT_LEN - 2; 206 memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short)); 207 if (inet6_option_append(cmsgp, raopt, 4, 0)) 208 errx(1, "inet6_option_append failed\n"); 209 } 210 211 void 212 dump(int s) 213 { 214 int i; 215 struct mld6_hdr *mld; 216 u_char buf[1024]; 217 struct sockaddr_in6 from; 218 int from_len = sizeof(from); 219 char ntop_buf[256]; 220 221 if ((i = recvfrom(s, buf, sizeof(buf), 0, 222 (struct sockaddr *)&from, 223 &from_len)) < 0) 224 return; 225 226 if (i < sizeof(struct mld6_hdr)) { 227 printf("too short!\n"); 228 return; 229 } 230 231 mld = (struct mld6_hdr *)buf; 232 233 printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr, 234 ntop_buf, sizeof(ntop_buf))); 235 236 switch (mld->mld6_type) { 237 case ICMP6_MEMBERSHIP_QUERY: 238 printf("type=Multicast Listener Query, "); 239 break; 240 case ICMP6_MEMBERSHIP_REPORT: 241 printf("type=Multicast Listener Report, "); 242 break; 243 case ICMP6_MEMBERSHIP_REDUCTION: 244 printf("type=Multicast Listener Done, "); 245 break; 246 } 247 printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld6_addr, 248 ntop_buf, sizeof(ntop_buf))); 249 250 fflush(stdout); 251 } 252 253 void 254 quit(int signum) { 255 mreq.ipv6mr_multiaddr = any; 256 mreq.ipv6mr_interface = ifindex; 257 if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, 258 sizeof(mreq)) == -1) 259 err(1, "setsockopt(IPV6_LEAVE_GROUP)"); 260 261 exit(0); 262 } 263 264 void 265 usage() 266 { 267 (void)fprintf(stderr, "usage: mld6query ifname [addr]\n"); 268 exit(1); 269 } 270