307 lines
8.5 KiB
C
307 lines
8.5 KiB
C
/* $NetBSD: mld6.c,v 1.16 2023/06/24 05:15:42 msaitoh Exp $ */
|
|
/* $KAME: mld6.c,v 1.9 2000/12/04 06:29:37 itojun Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <poll.h>
|
|
#include <unistd.h>
|
|
#include <signal.h>
|
|
|
|
#include <net/if.h>
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
|
|
#include <net/if_var.h>
|
|
#endif /* __FreeBSD__ >= 3 */
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/ip6.h>
|
|
#include <netinet/icmp6.h>
|
|
|
|
#include <arpa/inet.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <err.h>
|
|
|
|
static struct msghdr m;
|
|
static struct sockaddr_in6 dst;
|
|
static struct mld6_hdr mldh;
|
|
static struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT;
|
|
static struct ipv6_mreq mreq;
|
|
static u_short ifindex;
|
|
static int sock;
|
|
|
|
#define QUERY_RESPONSE_INTERVAL 10000
|
|
|
|
static void make_msg(int index, struct in6_addr *addr, u_int type);
|
|
__dead static void usage(void);
|
|
static void dump(int);
|
|
__dead static void quit(int);
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int i;
|
|
struct icmp6_filter filt;
|
|
u_int hlim = 1;
|
|
struct pollfd set[1];
|
|
struct itimerval itimer;
|
|
u_int type;
|
|
int ch;
|
|
|
|
type = MLD_LISTENER_QUERY;
|
|
while ((ch = getopt(argc, argv, "dr")) != -1) {
|
|
switch (ch) {
|
|
case 'd':
|
|
type = MLD_LISTENER_DONE;
|
|
break;
|
|
case 'r':
|
|
type = MLD_LISTENER_REPORT;
|
|
break;
|
|
default:
|
|
usage();
|
|
/*NOTREACHED*/
|
|
}
|
|
}
|
|
|
|
argv += optind;
|
|
argc -= optind;
|
|
|
|
if (argc != 1 && argc != 2)
|
|
usage();
|
|
|
|
ifindex = (u_short)if_nametoindex(argv[0]);
|
|
if (ifindex == 0)
|
|
usage();
|
|
if (argc == 3 && inet_pton(AF_INET6, argv[1], &maddr) != 1)
|
|
usage();
|
|
|
|
if ((sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
|
|
err(1, "socket");
|
|
|
|
if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &hlim,
|
|
sizeof(hlim)) == -1)
|
|
err(1, "setsockopt(IPV6_MULTICAST_HOPS)");
|
|
|
|
mreq.ipv6mr_multiaddr = any;
|
|
mreq.ipv6mr_interface = ifindex;
|
|
if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
|
|
sizeof(mreq)) == -1)
|
|
err(1, "setsockopt(IPV6_JOIN_GROUP)");
|
|
|
|
ICMP6_FILTER_SETBLOCKALL(&filt);
|
|
ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_QUERY, &filt);
|
|
ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REPORT, &filt);
|
|
ICMP6_FILTER_SETPASS(ICMP6_MEMBERSHIP_REDUCTION, &filt);
|
|
if (setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
|
|
sizeof(filt)) < 0)
|
|
err(1, "setsockopt(ICMP6_FILTER)");
|
|
|
|
make_msg(ifindex, &maddr, type);
|
|
|
|
if (sendmsg(sock, &m, 0) < 0)
|
|
err(1, "sendmsg");
|
|
|
|
itimer.it_value.tv_sec = QUERY_RESPONSE_INTERVAL / 1000;
|
|
itimer.it_interval.tv_sec = 0;
|
|
itimer.it_interval.tv_usec = 0;
|
|
itimer.it_value.tv_usec = 0;
|
|
|
|
(void)signal(SIGALRM, quit);
|
|
(void)setitimer(ITIMER_REAL, &itimer, NULL);
|
|
|
|
set[0].fd = sock;
|
|
set[0].events = POLLIN;
|
|
for (;;) {
|
|
if ((i = poll(set, 1, INFTIM)) < 0)
|
|
perror("poll");
|
|
if (i == 0)
|
|
continue;
|
|
else
|
|
dump(sock);
|
|
}
|
|
}
|
|
|
|
static void
|
|
make_msg(int idx, struct in6_addr *addr, u_int type)
|
|
{
|
|
static struct iovec iov[2];
|
|
static u_char *cmsgbuf;
|
|
int cmsglen, hbhlen = 0;
|
|
#ifdef USE_RFC2292BIS
|
|
void *hbhbuf = NULL, *optp = NULL;
|
|
int currentlen;
|
|
#else
|
|
u_int8_t raopt[IP6OPT_RTALERT_LEN];
|
|
#endif
|
|
struct in6_pktinfo *pi;
|
|
struct cmsghdr *cmsgp;
|
|
u_short rtalert_code = htons(IP6OPT_RTALERT_MLD);
|
|
|
|
dst.sin6_len = sizeof(dst);
|
|
dst.sin6_family = AF_INET6;
|
|
if (IN6_IS_ADDR_UNSPECIFIED(addr)) {
|
|
if (inet_pton(AF_INET6, "ff02::1", &dst.sin6_addr) != 1)
|
|
errx(1, "inet_pton failed");
|
|
}
|
|
else
|
|
dst.sin6_addr = *addr;
|
|
m.msg_name = (caddr_t)&dst;
|
|
m.msg_namelen = dst.sin6_len;
|
|
iov[0].iov_base = (caddr_t)&mldh;
|
|
iov[0].iov_len = sizeof(mldh);
|
|
m.msg_iov = iov;
|
|
m.msg_iovlen = 1;
|
|
|
|
bzero(&mldh, sizeof(mldh));
|
|
mldh.mld6_type = type & 0xff;
|
|
mldh.mld6_maxdelay = htons(QUERY_RESPONSE_INTERVAL);
|
|
mldh.mld6_addr = *addr;
|
|
|
|
#ifdef USE_RFC2292BIS
|
|
if ((hbhlen = inet6_opt_init(NULL, 0)) == -1)
|
|
errx(1, "inet6_opt_init(0) failed");
|
|
if ((hbhlen = inet6_opt_append(NULL, 0, hbhlen, IP6OPT_ROUTER_ALERT, 2,
|
|
2, NULL)) == -1)
|
|
errx(1, "inet6_opt_append(0) failed");
|
|
if ((hbhlen = inet6_opt_finish(NULL, 0, hbhlen)) == -1)
|
|
errx(1, "inet6_opt_finish(0) failed");
|
|
cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(hbhlen);
|
|
#else
|
|
hbhlen = sizeof(raopt);
|
|
cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
|
|
inet6_option_space(hbhlen);
|
|
#endif
|
|
|
|
if ((cmsgbuf = malloc(cmsglen)) == NULL)
|
|
errx(1, "can't allocate enough memory for cmsg");
|
|
cmsgp = (struct cmsghdr *)cmsgbuf;
|
|
m.msg_control = (caddr_t)cmsgbuf;
|
|
m.msg_controllen = cmsglen;
|
|
/* specify the outgoing interface */
|
|
cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
|
|
cmsgp->cmsg_level = IPPROTO_IPV6;
|
|
cmsgp->cmsg_type = IPV6_PKTINFO;
|
|
pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
|
|
pi->ipi6_ifindex = idx;
|
|
memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr));
|
|
/* specify to insert router alert option in a hop-by-hop opt hdr. */
|
|
cmsgp = CMSG_NXTHDR(&m, cmsgp);
|
|
#ifdef USE_RFC2292BIS
|
|
cmsgp->cmsg_len = CMSG_LEN(hbhlen);
|
|
cmsgp->cmsg_level = IPPROTO_IPV6;
|
|
cmsgp->cmsg_type = IPV6_HOPOPTS;
|
|
hbhbuf = CMSG_DATA(cmsgp);
|
|
if ((currentlen = inet6_opt_init(hbhbuf, hbhlen)) == -1)
|
|
errx(1, "inet6_opt_init(len = %d) failed", hbhlen);
|
|
if ((currentlen = inet6_opt_append(hbhbuf, hbhlen, currentlen,
|
|
IP6OPT_ROUTER_ALERT, 2,
|
|
2, &optp)) == -1)
|
|
errx(1, "inet6_opt_append(currentlen = %d, hbhlen = %d) failed",
|
|
currentlen, hbhlen);
|
|
(void)inet6_opt_set_val(optp, 0, &rtalert_code, sizeof(rtalert_code));
|
|
if ((currentlen = inet6_opt_finish(hbhbuf, hbhlen, currentlen)) == -1)
|
|
errx(1, "inet6_opt_finish(buf) failed");
|
|
#else /* old advanced API */
|
|
if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS))
|
|
errx(1, "inet6_option_init failed");
|
|
raopt[0] = IP6OPT_RTALERT;
|
|
raopt[1] = IP6OPT_RTALERT_LEN - 2;
|
|
memcpy(&raopt[2], (caddr_t)&rtalert_code, sizeof(u_short));
|
|
if (inet6_option_append(cmsgp, raopt, 4, 0))
|
|
errx(1, "inet6_option_append failed");
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
dump(int s)
|
|
{
|
|
int i;
|
|
struct mld6_hdr *mld;
|
|
u_char buf[1024];
|
|
struct sockaddr_in6 from;
|
|
socklen_t from_len = sizeof(from);
|
|
char ntop_buf[256];
|
|
|
|
if ((i = recvfrom(s, buf, sizeof(buf), 0,
|
|
(struct sockaddr *)&from,
|
|
&from_len)) < 0)
|
|
return;
|
|
|
|
if (i < (int)sizeof(struct mld6_hdr)) {
|
|
printf("too short!\n");
|
|
return;
|
|
}
|
|
|
|
mld = (struct mld6_hdr *)buf;
|
|
|
|
printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr,
|
|
ntop_buf, sizeof(ntop_buf)));
|
|
|
|
switch (mld->mld6_type) {
|
|
case ICMP6_MEMBERSHIP_QUERY:
|
|
printf("type=Multicast Listener Query, ");
|
|
break;
|
|
case ICMP6_MEMBERSHIP_REPORT:
|
|
printf("type=Multicast Listener Report, ");
|
|
break;
|
|
case ICMP6_MEMBERSHIP_REDUCTION:
|
|
printf("type=Multicast Listener Done, ");
|
|
break;
|
|
}
|
|
printf("addr=%s\n", inet_ntop(AF_INET6, &mld->mld6_addr,
|
|
ntop_buf, sizeof(ntop_buf)));
|
|
|
|
fflush(stdout);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
quit(int signum) {
|
|
mreq.ipv6mr_multiaddr = any;
|
|
mreq.ipv6mr_interface = ifindex;
|
|
if (setsockopt(sock, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
|
|
sizeof(mreq)) == -1)
|
|
err(1, "setsockopt(IPV6_LEAVE_GROUP)");
|
|
|
|
exit(0);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr, "usage: %s [-dr] ifname [addr]\n", getprogname());
|
|
exit(1);
|
|
}
|