usr.sbin/mld6query/mld6.c

   1 /*      $KAME: mld6.c,v 1.11 2001/05/13 15:45:07 suz 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  * $FreeBSD: src/usr.sbin/mld6query/mld6.c,v 1.1.1.1.2.2 2001/07/03 11:02:06 ume Exp $
  32  * $DragonFly: src/usr.sbin/mld6query/mld6.c,v 1.4 2004/12/18 22:48:04 swildner Exp $
  33  */
  34 #include <sys/param.h>
  35 #include <sys/uio.h>
  36 #include <sys/socket.h>
  37 #include <sys/types.h>
  38 #include <sys/time.h>
  39 #include <unistd.h>
  40 #include <signal.h>
  41
  42 #include <net/if.h>
  43 #include <net/if_var.h>
  44
  45 #include <netinet/in.h>
  46 #include <netinet/ip6.h>
  47 #include <netinet/icmp6.h>
  48
  49 #include  <arpa/inet.h>
  50
  51 #include <stdlib.h>
  52 #include <stdio.h>
  53 #include <string.h>
  54 #include <err.h>
  55
  56 struct msghdr m;
  57 struct sockaddr_in6 dst;
  58 struct mld6_hdr mldh;
  59 struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT;
  60 struct ipv6_mreq mreq;
  61 u_short ifindex;
  62 int s;
  63
  64 #define QUERY_RESPONSE_INTERVAL 10000
  65
  66 void make_msg(int index, struct in6_addr *addr, u_int type);
  67 void usage(void);
  68 void dump(int);
  69 void quit(int);
  70
  71 int
  72 main(int argc, char *argv[])
  73 {
  74         int i;
  75         struct icmp6_filter filt;
  76         u_int hlim = 1;
  77         fd_set fdset;
  78         struct itimerval itimer;
  79         u_int type;
  80         int ch;
  81
  82         type = MLD6_LISTENER_QUERY;
  83         while ((ch = getopt(argc, argv, "dr")) != -1) {
  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 == 2 && 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         signal(SIGALRM, quit);
 141         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, hbhlen = 0;
 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         hbhlen = sizeof(raopt);
 187         cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
 188             inet6_option_space(hbhlen);
 189
 190         if ((cmsgbuf = malloc(cmsglen)) == NULL)
 191                 errx(1, "can't allocate enough memory for cmsg");
 192         cmsgp = (struct cmsghdr *)cmsgbuf;
 193         m.msg_control = (caddr_t)cmsgbuf;
 194         m.msg_controllen = cmsglen;
 195         /* specify the outgoing interface */
 196         cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 197         cmsgp->cmsg_level = IPPROTO_IPV6;
 198         cmsgp->cmsg_type = IPV6_PKTINFO;
 199         pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
 200         pi->ipi6_ifindex = index;
 201         memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr));
 202         /* specifiy to insert router alert option in a hop-by-hop opt hdr. */
 203         cmsgp = CMSG_NXTHDR(&m, cmsgp);
 204         if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS))
 205                 errx(1, "inet6_option_init failed\n");
 206         raopt[0] = IP6OPT_RTALERT;
 207         raopt[1] = IP6OPT_RTALERT_LEN - 2;
 208         memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short));
 209         if (inet6_option_append(cmsgp, raopt, 4, 0))
 210                 errx(1, "inet6_option_append failed\n");
 211 }
 212
 213 void
 214 dump(int s)
 215 {
 216         int i;
 217         struct mld6_hdr *mld;
 218         u_char buf[1024];
 219         struct sockaddr_in6 from;
 220         int from_len = sizeof(from);
 221         char ntop_buf[256];
 222
 223         if ((i = recvfrom(s, buf, sizeof(buf), 0,
 224                           (struct sockaddr *)&from,
 225                           &from_len)) < 0)
 226                 return;
 227
 228         if (i < sizeof(struct mld6_hdr)) {
 229                 printf("too short!\n");
 230                 return;
 231         }
 232
 233         mld = (struct mld6_hdr *)buf;
 234
 235         printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr,
 236                                       ntop_buf, sizeof(ntop_buf)));
 237
 238         switch (mld->mld6_type) {
 239         case ICMP6_MEMBERSHIP_QUERY:
 240                 printf("type=Multicast Listener Query, ");
 241                 break;
 242         case ICMP6_MEMBERSHIP_REPORT:
 243                 printf("type=Multicast Listener Report, ");
 244                 break;
 245         case ICMP6_MEMBERSHIP_REDUCTION:
 246                 printf("type=Multicast Listener Done, ");
 247                 break;
 248         }
 249         printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld6_addr,
 250                                     ntop_buf, sizeof(ntop_buf)));
 251
 252         fflush(stdout);
 253 }
 254
 255 /* ARGSUSED */
 256 void
 257 quit(int signum) {
 258         mreq.ipv6mr_multiaddr = any;
 259         mreq.ipv6mr_interface = ifindex;
 260         if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
 261                        sizeof(mreq)) == -1)
 262                 err(1, "setsockopt(IPV6_LEAVE_GROUP)");
 263
 264         exit(0);
 265 }
 266
 267 void
 268 usage(void)
 269 {
 270         fprintf(stderr, "usage: mld6query ifname [addr]\n");
 271         exit(1);
 272 }