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freebsd/usr.sbin/mld6query/mld6.c
Philippe Charnier 8e724c686f Add __unused. Ansi prototypes.
2010-12-20 08:54:30 +00:00

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9.6 KiB
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/* $KAME: mld6.c,v 1.15 2003/04/02 11:29:54 suz 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <ifaddrs.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>
/* portability with older KAME headers */
#ifndef MLD_LISTENER_QUERY
#define MLD_LISTENER_QUERY MLD6_LISTENER_QUERY
#define MLD_LISTENER_REPORT MLD6_LISTENER_REPORT
#define MLD_LISTENER_DONE MLD6_LISTENER_DONE
#define MLD_MTRACE_RESP MLD6_MTRACE_RESP
#define MLD_MTRACE MLD6_MTRACE
#define mld_hdr mld6_hdr
#define mld_type mld6_type
#define mld_code mld6_code
#define mld_cksum mld6_cksum
#define mld_maxdelay mld6_maxdelay
#define mld_reserved mld6_reserved
#define mld_addr mld6_addr
#endif
#ifndef IP6OPT_ROUTER_ALERT
#define IP6OPT_ROUTER_ALERT IP6OPT_RTALERT
#endif
struct msghdr m;
struct sockaddr_in6 dst;
struct mld_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 = 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 == 2 && 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);
if (s >= FD_SETSIZE)
errx(1, "descriptor too big");
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;
#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);
struct ifaddrs *ifa, *ifap;
struct in6_addr src;
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.mld_type = type & 0xff;
mldh.mld_maxdelay = htons(QUERY_RESPONSE_INTERVAL);
mldh.mld_addr = *addr;
/* MLD packet should be advertised from linklocal address */
getifaddrs(&ifa);
for (ifap = ifa; ifap; ifap = ifap->ifa_next) {
if (index != if_nametoindex(ifap->ifa_name))
continue;
if (ifap->ifa_addr->sa_family != AF_INET6)
continue;
if (!IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)
ifap->ifa_addr)->sin6_addr))
continue;
break;
}
if (ifap == NULL)
errx(1, "no linkocal address is available");
memcpy(&src, &((struct sockaddr_in6 *)ifap->ifa_addr)->sin6_addr,
sizeof(src));
freeifaddrs(ifa);
#ifdef __KAME__
/* remove embedded ifindex */
src.s6_addr[2] = src.s6_addr[3] = 0;
#endif
#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 = index;
memcpy(&pi->ipi6_addr, &src, sizeof(pi->ipi6_addr));
/* specifiy 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\n");
raopt[0] = IP6OPT_ROUTER_ALERT;
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");
#endif
}
void
dump(int s)
{
int i;
struct mld_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 mld_hdr)) {
printf("too short!\n");
return;
}
mld = (struct mld_hdr *)buf;
printf("from %s, ", inet_ntop(AF_INET6, &from.sin6_addr,
ntop_buf, sizeof(ntop_buf)));
switch (mld->mld_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->mld_addr,
ntop_buf, sizeof(ntop_buf)));
fflush(stdout);
}
void
quit(int signum __unused)
{
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)
{
(void)fprintf(stderr, "usage: mld6query ifname [addr]\n");
exit(1);
}
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