mld6.c revision 62915
1/* 2 * Copyright (C) 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29#include <sys/param.h> 30#include <sys/uio.h> 31#include <sys/socket.h> 32#include <sys/types.h> 33#include <sys/time.h> 34#include <unistd.h> 35#include <signal.h> 36 37#include <net/if.h> 38#include <net/if_var.h> 39 40#include <netinet/in.h> 41#include <netinet/ip6.h> 42#include <netinet/icmp6.h> 43 44#include <arpa/inet.h> 45 46#include <stdlib.h> 47#include <stdio.h> 48#include <string.h> 49#include <err.h> 50 51struct msghdr m; 52struct sockaddr_in6 dst; 53struct mld6_hdr mldh; 54struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT; 55struct ipv6_mreq mreq; 56u_short ifindex; 57int s; 58 59#define QUERY_RESPONSE_INTERVAL 10000 60 61void make_msg(int index, struct in6_addr *addr, u_int type); 62void usage(void); 63void dump(int); 64void quit(int); 65 66int 67main(int argc, char *argv[]) 68{ 69 int i; 70 struct icmp6_filter filt; 71 u_int hlim = 1; 72 fd_set fdset; 73 struct itimerval itimer; 74 u_int type; 75 int ch; 76 77 type = MLD6_LISTENER_QUERY; 78 while ((ch = getopt(argc, argv, "d")) != EOF) { 79 switch (ch) { 80 case 'd': 81 type = MLD6_LISTENER_DONE; 82 break; 83 case 'r': 84 type = MLD6_LISTENER_REPORT; 85 break; 86 default: 87 usage(); 88 /*NOTREACHED*/ 89 } 90 } 91 92 argv += optind; 93 argc -= optind; 94 95 if (argc != 1 && argc != 2) 96 usage(); 97 98 ifindex = (u_short)if_nametoindex(argv[0]); 99 if (ifindex == 0) 100 usage(); 101 if (argc == 3 && inet_pton(AF_INET6, argv[1], &maddr) != 1) 102 usage(); 103 104 if ((s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) 105 err(1, "socket"); 106 107 if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim, 108 sizeof(hlim)) == -1) 109 err(1, "setsockopt(IPV6_MULTICAST_HOPS)"); 110 111 mreq.ipv6mr_multiaddr = any; 112 mreq.ipv6mr_interface = ifindex; 113 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, 114 sizeof(mreq)) == -1) 115 err(1, "setsockopt(IPV6_JOIN_GROUP)"); 116 117 ICMP6_FILTER_SETBLOCKALL(&filt); 118 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt); 119 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt); 120 ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt); 121 if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, 122 sizeof(filt)) < 0) 123 err(1, "setsockopt(ICMP6_FILTER)"); 124 125 make_msg(ifindex, &maddr, type); 126 127 if (sendmsg(s, &m, 0) < 0) 128 err(1, "sendmsg"); 129 130 itimer.it_value.tv_sec = QUERY_RESPONSE_INTERVAL / 1000; 131 itimer.it_interval.tv_sec = 0; 132 itimer.it_interval.tv_usec = 0; 133 itimer.it_value.tv_usec = 0; 134 135 (void)signal(SIGALRM, quit); 136 (void)setitimer(ITIMER_REAL, &itimer, NULL); 137 138 FD_ZERO(&fdset); 139 for (;;) { 140 FD_SET(s, &fdset); 141 if ((i = select(s + 1, &fdset, NULL, NULL, NULL)) < 0) 142 perror("select"); 143 if (i == 0) 144 continue; 145 else 146 dump(s); 147 } 148} 149 150void 151make_msg(int index, struct in6_addr *addr, u_int type) 152{ 153 static struct iovec iov[2]; 154 static u_char *cmsgbuf; 155 int cmsglen, hbhlen = 0; 156 u_int8_t raopt[IP6OPT_RTALERT_LEN]; 157 struct in6_pktinfo *pi; 158 struct cmsghdr *cmsgp; 159 u_short rtalert_code = htons(IP6OPT_RTALERT_MLD); 160 161 dst.sin6_len = sizeof(dst); 162 dst.sin6_family = AF_INET6; 163 if (IN6_IS_ADDR_UNSPECIFIED(addr)) { 164 if (inet_pton(AF_INET6, "ff02::1", &dst.sin6_addr) != 1) 165 errx(1, "inet_pton failed"); 166 } 167 else 168 dst.sin6_addr = *addr; 169 m.msg_name = (caddr_t)&dst; 170 m.msg_namelen = dst.sin6_len; 171 iov[0].iov_base = (caddr_t)&mldh; 172 iov[0].iov_len = sizeof(mldh); 173 m.msg_iov = iov; 174 m.msg_iovlen = 1; 175 176 bzero(&mldh, sizeof(mldh)); 177 mldh.mld6_type = type & 0xff; 178 mldh.mld6_maxdelay = htons(QUERY_RESPONSE_INTERVAL); 179 mldh.mld6_addr = *addr; 180 181 hbhlen = sizeof(raopt); 182 cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 183 inet6_option_space(hbhlen); 184 185 if ((cmsgbuf = malloc(cmsglen)) == NULL) 186 errx(1, "can't allocate enough memory for cmsg"); 187 cmsgp = (struct cmsghdr *)cmsgbuf; 188 m.msg_control = (caddr_t)cmsgbuf; 189 m.msg_controllen = cmsglen; 190 /* specify the outgoing interface */ 191 cmsgp->cmsg_len = CMSG_SPACE(sizeof(struct in6_pktinfo)); 192 cmsgp->cmsg_level = IPPROTO_IPV6; 193 cmsgp->cmsg_type = IPV6_PKTINFO; 194 pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp); 195 pi->ipi6_ifindex = index; 196 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); 197 /* specifiy to insert router alert option in a hop-by-hop opt hdr. */ 198 cmsgp = CMSG_NXTHDR(&m, cmsgp); 199 if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS)) 200 errx(1, "inet6_option_init failed\n"); 201 raopt[0] = IP6OPT_RTALERT; 202 raopt[1] = IP6OPT_RTALERT_LEN - 2; 203 memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short)); 204 if (inet6_option_append(cmsgp, raopt, 4, 0)) 205 errx(1, "inet6_option_append failed\n"); 206} 207 208void 209dump(int s) 210{ 211 int i; 212 struct mld6_hdr *mld; 213 u_char buf[1024]; 214 struct sockaddr_in6 from; 215 int from_len = sizeof(from); 216 char ntop_buf[256]; 217 218 if ((i = recvfrom(s, buf, sizeof(buf), 0, 219 (struct sockaddr *)&from, 220 &from_len)) < 0) 221 return; 222 223 if (i < sizeof(struct mld6_hdr)) { 224 printf("too short!\n"); 225 return; 226 } 227 228 mld = (struct mld6_hdr *)buf; 229 230 printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr, 231 ntop_buf, sizeof(ntop_buf))); 232 233 switch (mld->mld6_type) { 234 case ICMP6_MEMBERSHIP_QUERY: 235 printf("type=Multicast Listener Query, "); 236 break; 237 case ICMP6_MEMBERSHIP_REPORT: 238 printf("type=Multicast Listener Report, "); 239 break; 240 case ICMP6_MEMBERSHIP_REDUCTION: 241 printf("type=Multicast Listener Done, "); 242 break; 243 } 244 printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld6_addr, 245 ntop_buf, sizeof(ntop_buf))); 246 247 fflush(stdout); 248} 249 250/* ARGSUSED */ 251void 252quit(int signum) { 253 mreq.ipv6mr_multiaddr = any; 254 mreq.ipv6mr_interface = ifindex; 255 if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, 256 sizeof(mreq)) == -1) 257 err(1, "setsockopt(IPV6_LEAVE_GROUP)"); 258 259 exit(0); 260} 261 262void 263usage() 264{ 265 (void)fprintf(stderr, "usage: mld6query ifname [addr]\n"); 266 exit(1); 267} 268