freebsd-skq/usr.sbin/mld6query/mld6.c
ume a75c47b60d mld6query sends an IPv6 multicast listener discovery (MLD) query packet
toward the specified multicast address.

Obtained from:	KAME
2000-07-10 16:56:19 +00:00

268 lines
7.0 KiB
C

/*
* 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 <unistd.h>
#include <signal.h>
#include <net/if.h>
#include <net/if_var.h>
#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>
struct msghdr m;
struct sockaddr_in6 dst;
struct mld6_hdr mldh;
struct in6_addr maddr = IN6ADDR_ANY_INIT, any = IN6ADDR_ANY_INIT;
struct ipv6_mreq mreq;
u_short ifindex;
int s;
#define QUERY_RESPONSE_INTERVAL 10000
void make_msg(int index, struct in6_addr *addr, u_int type);
void usage(void);
void dump(int);
void quit(int);
int
main(int argc, char *argv[])
{
int i;
struct icmp6_filter filt;
u_int hlim = 1;
fd_set fdset;
struct itimerval itimer;
u_int type;
int ch;
type = MLD6_LISTENER_QUERY;
while ((ch = getopt(argc, argv, "d")) != EOF) {
switch (ch) {
case 'd':
type = MLD6_LISTENER_DONE;
break;
case 'r':
type = MLD6_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 ((s = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
err(1, "socket");
if (setsockopt(s, 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(s, 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(s, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
sizeof(filt)) < 0)
err(1, "setsockopt(ICMP6_FILTER)");
make_msg(ifindex, &maddr, type);
if (sendmsg(s, &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);
FD_ZERO(&fdset);
for (;;) {
FD_SET(s, &fdset);
if ((i = select(s + 1, &fdset, NULL, NULL, NULL)) < 0)
perror("select");
if (i == 0)
continue;
else
dump(s);
}
}
void
make_msg(int index, struct in6_addr *addr, u_int type)
{
static struct iovec iov[2];
static u_char *cmsgbuf;
int cmsglen, hbhlen = 0;
u_int8_t raopt[IP6OPT_RTALERT_LEN];
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;
hbhlen = sizeof(raopt);
cmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
inet6_option_space(hbhlen);
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_SPACE(sizeof(struct in6_pktinfo));
cmsgp->cmsg_level = IPPROTO_IPV6;
cmsgp->cmsg_type = IPV6_PKTINFO;
pi = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
pi->ipi6_ifindex = index;
memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr));
/* specifiy to insert router alert option in a hop-by-hop opt hdr. */
cmsgp = CMSG_NXTHDR(&m, cmsgp);
if (inet6_option_init((void *)cmsgp, &cmsgp, IPV6_HOPOPTS))
errx(1, "inet6_option_init failed\n");
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\n");
}
void
dump(int s)
{
int i;
struct mld6_hdr *mld;
u_char buf[1024];
struct sockaddr_in6 from;
int 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 < 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 */
void
quit(int signum) {
mreq.ipv6mr_multiaddr = any;
mreq.ipv6mr_interface = ifindex;
if (setsockopt(s, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
sizeof(mreq)) == -1)
err(1, "setsockopt(IPV6_LEAVE_GROUP)");
exit(0);
}
void
usage()
{
(void)fprintf(stderr, "usage: mld6query ifname [addr]\n");
exit(1);
}