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freebsd/usr.sbin/ifmcstat/ifmcstat.c
Bruce M Simpson 60dd8da775 Considerably rework the ifmcstat utility.
* Build with or without INET, INET6, or KVM features.
  * When built without KVM, the sysctl-based getifmaddrs() function
    is used as the back-end for the utility.
 * Reflect the fact that FreeBSD now uses the in_multi refcount as
   a true refcount.
 * Style.

The utility may now be run without super-user privilege, albeit with
a less detailed display, equivalent to that of the soon-to-be-retired
netstat -g host-mode output.

MFC after:	3 weeks
2007-04-10 00:26:12 +00:00

784 lines
18 KiB
C

/* $KAME: ifmcstat.c,v 1.48 2006/11/15 05:13:59 itojun Exp $ */
/*
* Copyright (c) 2007 Bruce M. Simpson <bms@FreeBSD.org>
* Copyright (C) 1995, 1996, 1997, and 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/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/igmp.h>
#ifdef HAVE_IGMPV3
# include <netinet/in_msf.h>
#endif
#define KERNEL
# include <netinet/if_ether.h>
#undef KERNEL
#define _KERNEL
# include <sys/sysctl.h>
# include <netinet/igmp_var.h>
#undef _KERNEL
#ifdef INET6
# ifdef HAVE_MLDV2
# include <netinet6/in6_msf.h>
# endif
#include <netinet/icmp6.h>
#define _KERNEL
# include <netinet6/mld6_var.h>
#undef _KERNEL
#endif /* INET6 */
#include <arpa/inet.h>
#include <netdb.h>
#include <stddef.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <ifaddrs.h>
#include <nlist.h>
#include <sysexits.h>
#include <unistd.h>
/* XXX: This file currently assumes INET and KVM support in the base system. */
#ifndef INET
#define INET
#endif
union sockunion {
struct sockaddr_storage ss;
struct sockaddr sa;
struct sockaddr_dl sdl;
#ifdef INET
struct sockaddr_in sin;
#endif
#ifdef INET6
struct sockaddr_in6 sin6;
#endif
};
typedef union sockunion sockunion_t;
uint32_t ifindex = 0;
int af = AF_UNSPEC;
#define sa_equal(a1, a2) \
(bcmp((a1), (a2), ((a1))->sa_len) == 0)
#define sa_dl_equal(a1, a2) \
((((struct sockaddr_dl *)(a1))->sdl_len == \
((struct sockaddr_dl *)(a2))->sdl_len) && \
(bcmp(LLADDR((struct sockaddr_dl *)(a1)), \
LLADDR((struct sockaddr_dl *)(a2)), \
((struct sockaddr_dl *)(a1))->sdl_alen) == 0))
/*
* Most of the code in this utility is to support the use of KVM for
* post-mortem debugging of the multicast code.
*/
#ifdef WITH_KVM
#ifdef INET
static void if_addrlist(struct ifaddr *);
static struct in_multi *
in_multientry(struct in_multi *);
#ifdef HAVE_IGMPV3
static void in_addr_slistentry(struct in_addr_slist *, char *);
#endif
#endif /* INET */
#ifdef INET6
static void if6_addrlist(struct ifaddr *);
static struct in6_multi *
in6_multientry(struct in6_multi *);
#ifdef HAVE_MLDV2
static void in6_addr_slistentry(struct in6_addr_slist *, char *);
#endif
static const char * inet6_n2a(struct in6_addr *);
#endif /* INET6 */
static void kread(u_long, void *, int);
static int ifmcstat_kvm(const char *kernel, const char *core);
#define KREAD(addr, buf, type) \
kread((u_long)addr, (void *)buf, sizeof(type))
kvm_t *kvmd;
struct nlist nl[] = {
{ "_ifnet", 0, 0, 0, 0, },
{ "", 0, 0, 0, 0, },
};
#define N_IFNET 0
#endif /* WITH_KVM */
static int ifmcstat_getifmaddrs(void);
int main(int, char **);
int
main(int argc, char **argv)
{
int c, error;
#ifdef WITH_KVM
const char *kernel = NULL;
const char *core = NULL;
/* "ifmcstat [kernel]" format is supported for backward compatiblity */
if (argc == 2)
kernel = argv[1];
#endif
while ((c = getopt(argc, argv, "i:f:M:N:")) != -1) {
switch (c) {
case 'i':
if ((ifindex = if_nametoindex(optarg)) == 0) {
fprintf(stderr, "%s: unknown interface\n",
optarg);
exit(1);
}
break;
case 'f':
#ifdef INET
if (strcmp(optarg, "inet") == 0) {
af = AF_INET;
break;
}
#endif
#ifdef INET6
if (strcmp(optarg, "inet6") == 0) {
af = AF_INET6;
break;
}
#endif
fprintf(stderr, "%s: unknown address family\n", optarg);
exit(1);
/*NOTREACHED*/
break;
#ifdef WITH_KVM
case 'M':
core = strdup(optarg);
break;
case 'N':
kernel = strdup(optarg);
break;
#endif
default:
fprintf(stderr,
"usage: ifmcstat [-i interface] [-f address family]"
#ifdef WITH_KVM
" [-M core] [-N system]"
#endif
"\n");
exit(1);
break;
/*NOTREACHED*/
}
}
#ifdef WITH_KVM
error = ifmcstat_kvm(kernel, core);
/*
* If KVM failed, and user did not explicitly specify a core file,
* try the sysctl backend.
*/
if (error != 0 && (core == NULL && kernel == NULL))
#endif
error = ifmcstat_getifmaddrs();
if (error != 0)
exit(1);
exit(0);
/*NOTREACHED*/
}
#ifdef WITH_KVM
static int
ifmcstat_kvm(const char *kernel, const char *core)
{
char buf[_POSIX2_LINE_MAX], ifname[IFNAMSIZ];
struct ifnet *ifp, *nifp, ifnet;
if ((kvmd = kvm_openfiles(kernel, core, NULL, O_RDONLY, buf)) ==
NULL) {
perror("kvm_openfiles");
return (-1);
}
if (kvm_nlist(kvmd, nl) < 0) {
perror("kvm_nlist");
return (-1);
}
if (nl[N_IFNET].n_value == 0) {
printf("symbol %s not found\n", nl[N_IFNET].n_name);
return (-1);
}
KREAD(nl[N_IFNET].n_value, &ifp, struct ifnet *);
while (ifp) {
KREAD(ifp, &ifnet, struct ifnet);
nifp = ifnet.if_link.tqe_next;
if (ifindex && ifindex != ifnet.if_index)
goto next;
printf("%s:\n", if_indextoname(ifnet.if_index, ifname));
#ifdef INET
if_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
#endif
#ifdef INET6
if6_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
#endif
next:
ifp = nifp;
}
return (0);
}
static void
kread(u_long addr, void *buf, int len)
{
if (kvm_read(kvmd, addr, buf, len) != len) {
perror("kvm_read");
exit(1);
}
}
#ifdef INET6
static const char *
inet6_n2a(struct in6_addr *p)
{
static char buf[NI_MAXHOST];
struct sockaddr_in6 sin6;
u_int32_t scopeid;
const int niflags = NI_NUMERICHOST;
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = *p;
if (IN6_IS_ADDR_LINKLOCAL(p) || IN6_IS_ADDR_MC_LINKLOCAL(p) ||
IN6_IS_ADDR_MC_NODELOCAL(p)) {
scopeid = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
if (scopeid) {
sin6.sin6_scope_id = scopeid;
sin6.sin6_addr.s6_addr[2] = 0;
sin6.sin6_addr.s6_addr[3] = 0;
}
}
if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
buf, sizeof(buf), NULL, 0, niflags) == 0)
return buf;
else
return "(invalid)";
}
static void
if6_addrlist(struct ifaddr *ifap)
{
struct ifaddr ifa;
struct sockaddr sa;
struct in6_ifaddr if6a;
struct ifaddr *ifap0;
if (af && af != AF_INET6)
return;
ifap0 = ifap;
while (ifap) {
KREAD(ifap, &ifa, struct ifaddr);
if (ifa.ifa_addr == NULL)
goto nextifap;
KREAD(ifa.ifa_addr, &sa, struct sockaddr);
if (sa.sa_family != PF_INET6)
goto nextifap;
KREAD(ifap, &if6a, struct in6_ifaddr);
printf("\tinet6 %s\n", inet6_n2a(&if6a.ia_addr.sin6_addr));
nextifap:
ifap = ifa.ifa_link.tqe_next;
}
if (ifap0) {
struct ifnet ifnet;
struct ifmultiaddr ifm, *ifmp = 0;
struct sockaddr_dl sdl;
KREAD(ifap0, &ifa, struct ifaddr);
KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
if (TAILQ_FIRST(&ifnet.if_multiaddrs))
ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
while (ifmp) {
KREAD(ifmp, &ifm, struct ifmultiaddr);
if (ifm.ifma_addr == NULL)
goto nextmulti;
KREAD(ifm.ifma_addr, &sa, struct sockaddr);
if (sa.sa_family != AF_INET6)
goto nextmulti;
(void)in6_multientry((struct in6_multi *)
ifm.ifma_protospec);
if (ifm.ifma_lladdr == 0)
goto nextmulti;
KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
printf("\t\t\tmcast-macaddr %s refcnt %d\n",
ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
ifm.ifma_refcount);
nextmulti:
ifmp = TAILQ_NEXT(&ifm, ifma_link);
}
}
}
static struct in6_multi *
in6_multientry(struct in6_multi *mc)
{
struct in6_multi multi;
#ifdef HAVE_MLDV2
struct in6_multi_source src;
struct router6_info rt6i;
#endif
KREAD(mc, &multi, struct in6_multi);
printf("\t\tgroup %s", inet6_n2a(&multi.in6m_addr));
printf(" refcnt %u\n", multi.in6m_refcount);
#ifdef HAVE_MLDV2
if (multi.in6m_rti != NULL) {
KREAD(multi.in6m_rti, &rt6i, struct router_info);
printf("\t\t\t");
switch (rt6i.rt6i_type) {
case MLD_V1_ROUTER:
printf("mldv1");
break;
case MLD_V2_ROUTER:
printf("mldv2");
break;
default:
printf("mldv?(%d)", rt6i.rt6i_type);
break;
}
if (multi.in6m_source == NULL) {
printf("\n");
return(multi.in6m_entry.le_next);
}
KREAD(multi.in6m_source, &src, struct in6_multi_source);
printf(" mode=%s grpjoin=%d\n",
src.i6ms_mode == MCAST_INCLUDE ? "include" :
src.i6ms_mode == MCAST_EXCLUDE ? "exclude" :
"???",
src.i6ms_grpjoin);
in6_addr_slistentry(src.i6ms_cur, "current");
in6_addr_slistentry(src.i6ms_rec, "recorded");
in6_addr_slistentry(src.i6ms_in, "included");
in6_addr_slistentry(src.i6ms_ex, "excluded");
in6_addr_slistentry(src.i6ms_alw, "allowed");
in6_addr_slistentry(src.i6ms_blk, "blocked");
in6_addr_slistentry(src.i6ms_toin, "to-include");
in6_addr_slistentry(src.i6ms_ex, "to-exclude");
}
#endif
return(multi.in6m_entry.le_next);
}
#ifdef HAVE_MLDV2
static void
in6_addr_slistentry(struct in6_addr_slist *ias, char *heading)
{
struct in6_addr_slist slist;
struct i6as_head head;
struct in6_addr_source src;
if (ias == NULL) {
printf("\t\t\t\t%s (none)\n", heading);
return;
}
memset(&slist, 0, sizeof(slist));
KREAD(ias, &slist, struct in6_addr_source);
printf("\t\t\t\t%s (entry num=%d)\n", heading, slist.numsrc);
if (slist.numsrc == 0) {
return;
}
KREAD(slist.head, &head, struct i6as_head);
KREAD(head.lh_first, &src, struct in6_addr_source);
while (1) {
printf("\t\t\t\t\tsource %s (ref=%d)\n",
inet6_n2a(&src.i6as_addr.sin6_addr),
src.i6as_refcount);
if (src.i6as_list.le_next == NULL)
break;
KREAD(src.i6as_list.le_next, &src, struct in6_addr_source);
}
return;
}
#endif /* HAVE_MLDV2 */
#endif /* INET6 */
#ifdef INET
static void
if_addrlist(struct ifaddr *ifap)
{
struct ifaddr ifa;
struct sockaddr sa;
struct in_ifaddr ia;
struct ifaddr *ifap0;
if (af && af != AF_INET)
return;
ifap0 = ifap;
while (ifap) {
KREAD(ifap, &ifa, struct ifaddr);
if (ifa.ifa_addr == NULL)
goto nextifap;
KREAD(ifa.ifa_addr, &sa, struct sockaddr);
if (sa.sa_family != PF_INET)
goto nextifap;
KREAD(ifap, &ia, struct in_ifaddr);
printf("\tinet %s\n", inet_ntoa(ia.ia_addr.sin_addr));
nextifap:
ifap = ifa.ifa_link.tqe_next;
}
if (ifap0) {
struct ifnet ifnet;
struct ifmultiaddr ifm, *ifmp = 0;
struct sockaddr_dl sdl;
KREAD(ifap0, &ifa, struct ifaddr);
KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
if (TAILQ_FIRST(&ifnet.if_multiaddrs))
ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
while (ifmp) {
KREAD(ifmp, &ifm, struct ifmultiaddr);
if (ifm.ifma_addr == NULL)
goto nextmulti;
KREAD(ifm.ifma_addr, &sa, struct sockaddr);
if (sa.sa_family != AF_INET)
goto nextmulti;
(void)in_multientry((struct in_multi *)
ifm.ifma_protospec);
if (ifm.ifma_lladdr == 0)
goto nextmulti;
KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
printf("\t\t\tmcast-macaddr %s refcnt %d\n",
ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
ifm.ifma_refcount);
nextmulti:
ifmp = TAILQ_NEXT(&ifm, ifma_link);
}
}
}
static struct in_multi *
in_multientry(struct in_multi *mc)
{
struct in_multi multi;
struct router_info rti;
#ifdef HAVE_IGMPV3
struct in_multi_source src;
#endif
KREAD(mc, &multi, struct in_multi);
printf("\t\tgroup %s\n", inet_ntoa(multi.inm_addr));
if (multi.inm_rti != NULL) {
KREAD(multi.inm_rti, &rti, struct router_info);
printf("\t\t\t");
switch (rti.rti_type) {
case IGMP_V1_ROUTER:
printf("igmpv1");
break;
case IGMP_V2_ROUTER:
printf("igmpv2");
break;
#ifdef HAVE_IGMPV3
case IGMP_V3_ROUTER:
printf("igmpv3");
break;
#endif
default:
printf("igmpv?(%d)", rti.rti_type);
break;
}
#ifdef HAVE_IGMPV3
if (multi.inm_source == NULL) {
printf("\n");
return (multi.inm_list.le_next);
}
KREAD(multi.inm_source, &src, struct in_multi_source);
printf(" mode=%s grpjoin=%d\n",
src.ims_mode == MCAST_INCLUDE ? "include" :
src.ims_mode == MCAST_EXCLUDE ? "exclude" :
"???",
src.ims_grpjoin);
in_addr_slistentry(src.ims_cur, "current");
in_addr_slistentry(src.ims_rec, "recorded");
in_addr_slistentry(src.ims_in, "included");
in_addr_slistentry(src.ims_ex, "excluded");
in_addr_slistentry(src.ims_alw, "allowed");
in_addr_slistentry(src.ims_blk, "blocked");
in_addr_slistentry(src.ims_toin, "to-include");
in_addr_slistentry(src.ims_ex, "to-exclude");
#else
printf("\n");
#endif
}
return (NULL);
}
#ifdef HAVE_IGMPV3
static void
in_addr_slistentry(struct in_addr_slist *ias, char *heading)
{
struct in_addr_slist slist;
struct ias_head head;
struct in_addr_source src;
if (ias == NULL) {
printf("\t\t\t\t%s (none)\n", heading);
return;
}
memset(&slist, 0, sizeof(slist));
KREAD(ias, &slist, struct in_addr_source);
printf("\t\t\t\t%s (entry num=%d)\n", heading, slist.numsrc);
if (slist.numsrc == 0) {
return;
}
KREAD(slist.head, &head, struct ias_head);
KREAD(head.lh_first, &src, struct in_addr_source);
while (1) {
printf("\t\t\t\t\tsource %s (ref=%d)\n",
inet_ntoa(src.ias_addr.sin_addr), src.ias_refcount);
if (src.ias_list.le_next == NULL)
break;
KREAD(src.ias_list.le_next, &src, struct in_addr_source);
}
return;
}
#endif /* HAVE_IGMPV3 */
#endif /* INET */
#endif /* WITH_KVM */
static int
ifmcstat_getifmaddrs(void)
{
char thisifname[IFNAMSIZ];
char addrbuf[INET6_ADDRSTRLEN];
struct ifaddrs *ifap, *ifa;
struct ifmaddrs *ifmap, *ifma;
sockunion_t lastifasa;
sockunion_t *psa, *pgsa, *pllsa, *pifasa;
char *pcolon;
char *pafname;
uint32_t lastifindex, thisifindex;
int error;
error = 0;
ifap = NULL;
ifmap = NULL;
lastifindex = 0;
thisifindex = 0;
lastifasa.ss.ss_family = AF_UNSPEC;
if (getifaddrs(&ifap) != 0) {
warn("getifmaddrs");
return (-1);
}
if (getifmaddrs(&ifmap) != 0) {
warn("getifmaddrs");
error = -1;
goto out;
}
for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
error = 0;
if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
continue;
psa = (sockunion_t *)ifma->ifma_name;
if (psa->sa.sa_family != AF_LINK) {
fprintf(stderr,
"WARNING: Kernel returned invalid data.\n");
error = -1;
break;
}
/* Filter on interface name. */
thisifindex = psa->sdl.sdl_index;
if (ifindex != 0 && thisifindex != ifindex)
continue;
/* Filter on address family. */
pgsa = (sockunion_t *)ifma->ifma_addr;
if (af != 0 && pgsa->sa.sa_family != af)
continue;
strlcpy(thisifname, link_ntoa(&psa->sdl), IFNAMSIZ);
pcolon = strchr(thisifname, ':');
if (pcolon)
*pcolon = '\0';
/* Only print the banner for the first ifmaddrs entry. */
if (lastifindex == 0 || lastifindex != thisifindex) {
lastifindex = thisifindex;
fprintf(stdout, "%s:\n", thisifname);
}
/*
* Currently, multicast joins only take place on the
* primary IPv4 address, and only on the link-local IPv6
* address, as per IGMPv2/3 and MLDv1/2 semantics.
* Therefore, we only look up the primary address on
* the first pass.
*/
pifasa = NULL;
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if ((strcmp(ifa->ifa_name, thisifname) != 0) ||
(ifa->ifa_addr == NULL) ||
(ifa->ifa_addr->sa_family != pgsa->sa.sa_family))
continue;
#ifdef INET6
/*
* For AF_INET6 only the link-local address should
* be returned.
* XXX: ifmcstat actually prints all of the inet6
* addresses, but never mind...
*/
pifasa = (sockunion_t *)ifa->ifa_addr;
if (pifasa->sa.sa_family == AF_INET6 &&
!IN6_IS_ADDR_LINKLOCAL(&pifasa->sin6.sin6_addr)) {
pifasa = NULL;
continue;
}
#endif
break;
}
if (pifasa == NULL)
continue; /* primary address not found */
/* Parse and print primary address, if not already printed. */
if (lastifasa.ss.ss_family == AF_UNSPEC ||
((lastifasa.ss.ss_family == AF_LINK &&
!sa_dl_equal(&lastifasa.sa, &pifasa->sa)) ||
!sa_equal(&lastifasa.sa, &pifasa->sa))) {
switch (pifasa->sa.sa_family) {
case AF_INET:
pafname = "inet";
break;
case AF_INET6:
pafname = "inet6";
break;
case AF_LINK:
pafname = "link";
break;
default:
pafname = "unknown";
break;
}
switch (pifasa->sa.sa_family) {
case AF_INET:
case AF_INET6:
case AF_LINK:
error = getnameinfo(&pifasa->sa,
pifasa->sa.sa_len,
addrbuf, sizeof(addrbuf), NULL, 0,
NI_NUMERICHOST);
if (error)
perror("getnameinfo");
break;
default:
addrbuf[0] = '\0';
break;
}
fprintf(stdout, "\t%s %s\n", pafname, addrbuf);
lastifasa = *pifasa;
}
/* Print this group address. */
error = getnameinfo(&pgsa->sa, pgsa->sa.sa_len, addrbuf,
sizeof(addrbuf), NULL, 0, NI_NUMERICHOST);
if (error)
perror("getnameinfo");
fprintf(stdout, "\t\tgroup %s\n", addrbuf);
/* Link-layer mapping, if present. */
pllsa = (sockunion_t *)ifma->ifma_lladdr;
if (pllsa != NULL) {
error = getnameinfo(&pifasa->sa, pifasa->sa.sa_len,
addrbuf, sizeof(addrbuf), NULL, 0, NI_NUMERICHOST);
fprintf(stdout, "\t\t\tmcast-macaddr %s\n", addrbuf);
}
}
out:
if (ifmap != NULL)
freeifmaddrs(ifmap);
if (ifap != NULL)
freeifaddrs(ifap);
return (error);
}