usr.sbin/mld6query/mld6.c

   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 }