270 lines
7.1 KiB
C
270 lines
7.1 KiB
C
/* $NetBSD: mld6.c,v 1.2 1999/09/03 04:34:34 itojun Exp $ */
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/*
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* Copyright (C) 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <signal.h>
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#include <net/if.h>
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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#include <net/if_var.h>
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#endif /* __FreeBSD__ >= 3 */
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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#include <netinet/icmp6.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <err.h>
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struct msghdr m;
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struct sockaddr_in6 dst;
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struct mld6_hdr mldh;
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struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT;
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struct ipv6_mreq mreq;
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u_short ifindex;
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int s;
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#define QUERY_RESPONSE_INTERVAL 10000
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void make_msg(int index, struct in6_addr *addr, u_int type);
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void usage(void);
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void dump(int);
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void quit(int);
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int
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main(int argc, char *argv[])
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{
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int i;
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struct icmp6_filter filt;
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u_int hlim = 1;
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fd_set fdset;
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struct itimerval itimer;
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u_int type;
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int ch;
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extern int optind;
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type = MLD6_LISTENER_QUERY;
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while ((ch = getopt(argc, argv, "d")) != EOF) {
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switch (ch) {
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case 'd':
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type = MLD6_LISTENER_DONE;
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break;
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case 'r':
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type = MLD6_LISTENER_REPORT;
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break;
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default:
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usage();
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/*NOTREACHED*/
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}
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}
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argv += optind;
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argc -= optind;
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if (argc != 1 && argc != 2)
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usage();
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ifindex = (u_short)if_nametoindex(argv[0]);
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if (ifindex == 0)
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usage();
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if (argc == 3 && inet_pton(AF_INET6, argv[1], &maddr) != 1)
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usage();
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if ((s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
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err(1, "socket");
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if (setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim,
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sizeof(hlim)) == -1)
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err(1, "setsockopt(IPV6_MULTICAST_HOPS)");
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mreq.ipv6mr_multiaddr = any;
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mreq.ipv6mr_interface = ifindex;
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if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
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sizeof(mreq)) == -1)
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err(1, "setsockopt(IPV6_JOIN_GROUP)");
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ICMP6_FILTER_SETBLOCKALL(&filt);
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ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt);
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ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt);
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ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt);
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if (setsockopt(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
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sizeof(filt)) < 0)
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err(1, "setsockopt(ICMP6_FILTER)");
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make_msg(ifindex, &maddr, type);
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if (sendmsg(s, &m, 0) < 0)
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err(1, "sendmsg");
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itimer.it_value.tv_sec = QUERY_RESPONSE_INTERVAL / 1000;
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itimer.it_interval.tv_sec = 0;
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itimer.it_interval.tv_usec = 0;
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itimer.it_value.tv_usec = 0;
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(void)signal(SIGALRM, quit);
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(void)setitimer(ITIMER_REAL, &itimer, NULL);
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FD_ZERO(&fdset);
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for (;;) {
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FD_SET(s, &fdset);
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if ((i = select(s + 1, &fdset, NULL, NULL, NULL)) < 0)
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perror("select");
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if (i == 0)
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continue;
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else
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dump(s);
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}
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}
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void
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make_msg(int index, struct in6_addr *addr, u_int type)
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{
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static struct iovec iov[2];
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static u_char *cmsgbuf;
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int cmsglen;
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u_int8_t raopt[IP6OPT_RTALERT_LEN];
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struct in6_pktinfo *pi;
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struct cmsghdr *cmsgp;
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u_short rtalert_code = htons(IP6OPT_RTALERT_MLD);
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dst.sin6_len = sizeof(dst);
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dst.sin6_family = AF_INET6;
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if (IN6_IS_ADDR_UNSPECIFIED(addr)) {
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if (inet_pton(AF_INET6, "ff02::1", &dst.sin6_addr) != 1)
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errx(1, "inet_pton failed");
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}
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else
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dst.sin6_addr = *addr;
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m.msg_name = (caddr_t)&dst;
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m.msg_namelen = dst.sin6_len;
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iov[0].iov_base = (caddr_t)&mldh;
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iov[0].iov_len = sizeof(mldh);
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m.msg_iov = iov;
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m.msg_iovlen = 1;
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bzero(&mldh, sizeof(mldh));
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mldh.mld6_type = type & 0xff;
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mldh.mld6_maxdelay = htons(QUERY_RESPONSE_INTERVAL);
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mldh.mld6_addr = *addr;
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cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
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inet6_option_space(sizeof(raopt));
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if ((cmsgbuf = malloc(cmsglen)) == NULL)
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errx(1, "can't allocate enough memory for cmsg");
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cmsgp = (struct cmsghdr *)cmsgbuf;
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m.msg_control = (caddr_t)cmsgbuf;
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m.msg_controllen = cmsglen;
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/* specify the outgoing interface */
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cmsgp->cmsg_len = CMSG_SPACE(sizeof(struct in6_pktinfo));
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cmsgp->cmsg_level = IPPROTO_IPV6;
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cmsgp->cmsg_type = IPV6_PKTINFO;
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pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
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pi->ipi6_ifindex = ifindex;
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memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr));
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/* specifiy to insert router alert option in a hop-by-hop opt hdr. */
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cmsgp = CMSG_NXTHDR(&m, cmsgp);
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if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS))
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errx(1, "inet6_option_init failed\n");
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raopt[0] = IP6OPT_RTALERT;
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raopt[1] = IP6OPT_RTALERT_LEN - 2;
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memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short));
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if (inet6_option_append(cmsgp, raopt, 4, 0))
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errx(1, "inet6_option_append failed\n");
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}
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void
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dump(int s)
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{
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int i;
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struct mld6_hdr *mld;
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u_char buf[1024];
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struct sockaddr_in6 from;
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int from_len = sizeof(from);
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char ntop_buf[256];
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if ((i = recvfrom(s, buf, sizeof(buf), 0,
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(struct sockaddr *)&from,
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&from_len)) < 0)
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return;
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if (i < sizeof(struct mld6_hdr)) {
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printf("too short!\n");
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return;
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}
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mld = (struct mld6_hdr *)buf;
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printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr,
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ntop_buf, sizeof(ntop_buf)));
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switch (mld->mld6_type) {
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case ICMP6_MEMBERSHIP_QUERY:
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printf("type=Multicast Listener Query, ");
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break;
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case ICMP6_MEMBERSHIP_REPORT:
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printf("type=Multicast Listener Report, ");
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break;
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case ICMP6_MEMBERSHIP_REDUCTION:
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printf("type=Multicast Listener Done, ");
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break;
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}
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printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld6_addr,
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ntop_buf, sizeof(ntop_buf)));
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fflush(stdout);
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}
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void
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quit(int signum) {
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mreq.ipv6mr_multiaddr = any;
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mreq.ipv6mr_interface = ifindex;
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if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
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sizeof(mreq)) == -1)
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err(1, "setsockopt(IPV6_LEAVE_GROUP)");
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exit(0);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: mld6query ifname [addr]\n");
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exit(1);
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}
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