usr.sbin/mld6query/mld6.c

   1 /*      $NetBSD: mld6.c,v 1.12 2006/05/09 20:18:09 mrg Exp $    */
   2 /*      $KAME: mld6.c,v 1.9 2000/12/04 06:29:37 itojun Exp $    */
   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 <poll.h>
  38 #include <unistd.h>
  39 #include <signal.h>
  40
  41 #include <net/if.h>
  42 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
  43 #include <net/if_var.h>
  44 #endif /* __FreeBSD__ >= 3 */
  45
  46 #include <netinet/in.h>
  47 #include <netinet/ip6.h>
  48 #include <netinet/icmp6.h>
  49
  50 #include  <arpa/inet.h>
  51
  52 #include <stdlib.h>
  53 #include <stdio.h>
  54 #include <string.h>
  55 #include <err.h>
  56
  57 struct msghdr m;
  58 struct sockaddr_in6 dst;
  59 struct mld6_hdr mldh;
  60 struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT;
  61 struct ipv6_mreq mreq;
  62 u_short ifindex;
  63 int sock;
  64
  65 #define QUERY_RESPONSE_INTERVAL 10000
  66
  67 void make_msg(int index, struct in6_addr *addr, u_int type);
  68 void usage(void);
  69 void dump(int);
  70 void quit(int);
  71
  72 int
  73 main(int argc, char *argv[])
  74 {
  75         int i;
  76         struct icmp6_filter filt;
  77         u_int hlim = 1;
  78         struct pollfd set[1];
  79         struct itimerval itimer;
  80         u_int type;
  81         int ch;
  82
  83         type = MLD_LISTENER_QUERY;
  84         while ((ch = getopt(argc, argv, "d")) != -1) {
  85                 switch (ch) {
  86                 case 'd':
  87                         type = MLD_LISTENER_DONE;
  88                         break;
  89                 case 'r':
  90                         type = MLD_LISTENER_REPORT;
  91                         break;
  92                 default:
  93                         usage();
  94                         /*NOTREACHED*/
  95                 }
  96         }
  97
  98         argv += optind;
  99         argc -= optind;
 100
 101         if (argc != 1 && argc != 2)
 102                 usage();
 103
 104         ifindex = (u_short)if_nametoindex(argv[0]);
 105         if (ifindex == 0)
 106                 usage();
 107         if (argc == 3 && inet_pton(AF_INET6, argv[1], &maddr) != 1)
 108                 usage();
 109
 110         if ((sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
 111                 err(1, "socket");
 112
 113         if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim,
 114                        sizeof(hlim)) == -1)
 115                 err(1, "setsockopt(IPV6_MULTICAST_HOPS)");
 116
 117         mreq.ipv6mr_multiaddr = any;
 118         mreq.ipv6mr_interface = ifindex;
 119         if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
 120                        sizeof(mreq)) == -1)
 121                 err(1, "setsockopt(IPV6_JOIN_GROUP)");
 122
 123         ICMP6_FILTER_SETBLOCKALL(&filt);
 124         ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt);
 125         ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt);
 126         ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt);
 127         if (setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
 128                         sizeof(filt)) < 0)
 129                 err(1, "setsockopt(ICMP6_FILTER)");
 130
 131         make_msg(ifindex, &maddr, type);
 132
 133         if (sendmsg(sock, &m, 0) < 0)
 134                 err(1, "sendmsg");
 135
 136         itimer.it_value.tv_sec =  QUERY_RESPONSE_INTERVAL / 1000;
 137         itimer.it_interval.tv_sec = 0;
 138         itimer.it_interval.tv_usec = 0;
 139         itimer.it_value.tv_usec = 0;
 140
 141         (void)signal(SIGALRM, quit);
 142         (void)setitimer(ITIMER_REAL, &itimer, NULL);
 143
 144         set[0].fd = sock;
 145         set[0].events = POLLIN;
 146         for (;;) {
 147                 if ((i = poll(set, 1, INFTIM)) < 0)
 148                         perror("poll");
 149                 if (i == 0)
 150                         continue;
 151                 else
 152                         dump(sock);
 153         }
 154 }
 155
 156 void
 157 make_msg(int idx, struct in6_addr *addr, u_int type)
 158 {
 159         static struct iovec iov[2];
 160         static u_char *cmsgbuf;
 161         int cmsglen, hbhlen = 0;
 162 #ifdef USE_RFC2292BIS
 163         void *hbhbuf = NULL, *optp = NULL;
 164         int currentlen;
 165 #else
 166         u_int8_t raopt[IP6OPT_RTALERT_LEN];
 167 #endif
 168         struct in6_pktinfo *pi;
 169         struct cmsghdr *cmsgp;
 170         u_short rtalert_code = htons(IP6OPT_RTALERT_MLD);
 171
 172         dst.sin6_len = sizeof(dst);
 173         dst.sin6_family = AF_INET6;
 174         if (IN6_IS_ADDR_UNSPECIFIED(addr)) {
 175                 if (inet_pton(AF_INET6, "ff02::1", &dst.sin6_addr) != 1)
 176                         errx(1, "inet_pton failed");
 177         }
 178         else
 179                 dst.sin6_addr = *addr;
 180         m.msg_name = (caddr_t)&dst;
 181         m.msg_namelen = dst.sin6_len;
 182         iov[0].iov_base = (caddr_t)&mldh;
 183         iov[0].iov_len = sizeof(mldh);
 184         m.msg_iov = iov;
 185         m.msg_iovlen = 1;
 186
 187         bzero(&mldh, sizeof(mldh));
 188         mldh.mld6_type = type & 0xff;
 189         mldh.mld6_maxdelay = htons(QUERY_RESPONSE_INTERVAL);
 190         mldh.mld6_addr = *addr;
 191
 192 #ifdef USE_RFC2292BIS
 193         if ((hbhlen = inet6_opt_init(NULL, 0)) == -1)
 194                 errx(1, "inet6_opt_init(0) failed");
 195         if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2,
 196                                        2, NULL)) == -1)
 197                 errx(1, "inet6_opt_append(0) failed");
 198         if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1)
 199                 errx(1, "inet6_opt_finish(0) failed");
 200         cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(hbhlen);
 201 #else
 202         hbhlen = sizeof(raopt);
 203         cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
 204             inet6_option_space(hbhlen);
 205 #endif
 206
 207         if ((cmsgbuf = malloc(cmsglen)) == NULL)
 208                 errx(1, "can't allocate enough memory for cmsg");
 209         cmsgp = (struct cmsghdr *)cmsgbuf;
 210         m.msg_control = (caddr_t)cmsgbuf;
 211         m.msg_controllen = cmsglen;
 212         /* specify the outgoing interface */
 213         cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 214         cmsgp->cmsg_level = IPPROTO_IPV6;
 215         cmsgp->cmsg_type = IPV6_PKTINFO;
 216         pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
 217         pi->ipi6_ifindex = idx;
 218         memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr));
 219         /* specifiy to insert router alert option in a hop-by-hop opt hdr. */
 220         cmsgp = CMSG_NXTHDR(&m, cmsgp);
 221 #ifdef USE_RFC2292BIS
 222         cmsgp->cmsg_len = CMSG_LEN(hbhlen);
 223         cmsgp->cmsg_level = IPPROTO_IPV6;
 224         cmsgp->cmsg_type = IPV6_HOPOPTS;
 225         hbhbuf = CMSG_DATA(cmsgp);
 226         if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1)
 227                 errx(1, "inet6_opt_init(len = %d) failed", hbhlen);
 228         if ((currentlen = inet6_opt_append(hbhbuf, hbhlen, currentlen,
 229                                            IP6OPT_ROUTER_ALERT, 2,
 230                                            2, &optp)) == -1)
 231                 errx(1, "inet6_opt_append(currentlen = %d, hbhlen = %d) failed",
 232                      currentlen, hbhlen);
 233         (void)inet6_opt_set_val(optp, 0, &rtalert_code, sizeof(rtalert_code));
 234         if ((currentlen = inet6_opt_finish(hbhbuf, hbhlen, currentlen)) == -1)
 235                 errx(1, "inet6_opt_finish(buf) failed");
 236 #else  /* old advanced API */
 237         if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS))
 238                 errx(1, "inet6_option_init failed");
 239         raopt[0] = IP6OPT_RTALERT;
 240         raopt[1] = IP6OPT_RTALERT_LEN - 2;
 241         memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short));
 242         if (inet6_option_append(cmsgp, raopt, 4, 0))
 243                 errx(1, "inet6_option_append failed");
 244 #endif
 245 }
 246
 247 void
 248 dump(int s)
 249 {
 250         int i;
 251         struct mld6_hdr *mld;
 252         u_char buf[1024];
 253         struct sockaddr_in6 from;
 254         socklen_t from_len = sizeof(from);
 255         char ntop_buf[256];
 256
 257         if ((i = recvfrom(s, buf, sizeof(buf), 0,
 258                           (struct sockaddr *)&from,
 259                           &from_len)) < 0)
 260                 return;
 261
 262         if (i < (int)sizeof(struct mld6_hdr)) {
 263                 printf("too short!\n");
 264                 return;
 265         }
 266
 267         mld = (struct mld6_hdr *)buf;
 268
 269         printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr,
 270                                       ntop_buf, sizeof(ntop_buf)));
 271
 272         switch (mld->mld6_type) {
 273         case ICMP6_MEMBERSHIP_QUERY:
 274                 printf("type=Multicast Listener Query, ");
 275                 break;
 276         case ICMP6_MEMBERSHIP_REPORT:
 277                 printf("type=Multicast Listener Report, ");
 278                 break;
 279         case ICMP6_MEMBERSHIP_REDUCTION:
 280                 printf("type=Multicast Listener Done, ");
 281                 break;
 282         }
 283         printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld6_addr,
 284                                     ntop_buf, sizeof(ntop_buf)));
 285
 286         fflush(stdout);
 287 }
 288
 289 /* ARGSUSED */
 290 void
 291 quit(int signum) {
 292         mreq.ipv6mr_multiaddr = any;
 293         mreq.ipv6mr_interface = ifindex;
 294         if (setsockopt(sock, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
 295                        sizeof(mreq)) == -1)
 296                 err(1, "setsockopt(IPV6_LEAVE_GROUP)");
 297
 298         exit(0);
 299 }
 300
 301 void
 302 usage()
 303 {
 304         (void)fprintf(stderr, "usage: %s [-dr] ifname [addr]\n", getprogname());
 305         exit(1);
 306 }