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/*
* Copyright (c) 2007 Bruce M. Simpson <bms@FreeBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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("$FreeBSD$");
/*
* Print the running system's current multicast group memberships.
* As this relies on getifmaddrs(), it may not be used with a core file.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_mib.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ctype.h>
#include <err.h>
#include <ifaddrs.h>
#include <sysexits.h>
#include <stddef.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "netstat.h"
union sockunion {
struct sockaddr_storage ss;
struct sockaddr sa;
struct sockaddr_dl sdl;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
};
typedef union sockunion sockunion_t;
void ifmalist_dump_af(const struct ifmaddrs * const ifmap, int const af);
void
ifmalist_dump_af(const struct ifmaddrs * const ifmap, int const af)
{
const struct ifmaddrs *ifma;
sockunion_t *psa;
char myifname[IFNAMSIZ];
char addrbuf[INET6_ADDRSTRLEN];
char *pcolon;
char *pafname, *pifname, *plladdr, *pgroup;
#ifdef INET6
void *in6addr;
#endif
switch (af) {
case AF_INET:
pafname = "IPv4";
break;
#ifdef INET6
case AF_INET6:
pafname = "IPv6";
break;
#endif
case AF_LINK:
pafname = "Link-layer";
break;
default:
return; /* XXX */
}
fprintf(stdout, "%s Multicast Group Memberships\n", pafname);
fprintf(stdout, "%-20s\t%-16s\t%s\n", "Group", "Link-layer Address",
"Netif");
for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
continue;
/* Group address */
psa = (sockunion_t *)ifma->ifma_addr;
if (psa->sa.sa_family != af)
continue;
switch (psa->sa.sa_family) {
case AF_INET:
pgroup = inet_ntoa(psa->sin.sin_addr);
break;
#ifdef INET6
case AF_INET6:
in6addr = &psa->sin6.sin6_addr;
inet_ntop(psa->sa.sa_family, in6addr, addrbuf,
sizeof(addrbuf));
pgroup = addrbuf;
break;
#endif
case AF_LINK:
if ((psa->sdl.sdl_alen == ETHER_ADDR_LEN) ||
(psa->sdl.sdl_type == IFT_ETHER)) {
pgroup =
ether_ntoa((struct ether_addr *)&psa->sdl.sdl_data);
} else {
pgroup = addr2ascii(AF_LINK,
&psa->sdl,
sizeof(struct sockaddr_dl),
addrbuf);
}
break;
default:
continue; /* XXX */
}
/* Link-layer mapping, if any */
psa = (sockunion_t *)ifma->ifma_lladdr;
if (psa != NULL) {
if (psa->sa.sa_family == AF_LINK) {
if ((psa->sdl.sdl_alen == ETHER_ADDR_LEN) ||
(psa->sdl.sdl_type == IFT_ETHER)) {
/* IEEE 802 */
plladdr =
ether_ntoa((struct ether_addr *)&psa->sdl.sdl_data);
} else {
/* something more exotic */
plladdr = addr2ascii(AF_LINK,
&psa->sdl,
sizeof(struct sockaddr_dl),
addrbuf);
}
} else {
/* not a link-layer address */
plladdr = "<invalid>";
}
} else {
plladdr = "<none>";
}
/* Interface upon which the membership exists */
psa = (sockunion_t *)ifma->ifma_name;
if (psa != NULL && psa->sa.sa_family == AF_LINK) {
strlcpy(myifname, link_ntoa(&psa->sdl), IFNAMSIZ);
pcolon = strchr(myifname, ':');
if (pcolon)
*pcolon = '\0';
pifname = myifname;
} else {
pifname = "";
}
fprintf(stdout, "%-20s\t%-16s\t%s\n", pgroup, plladdr, pifname);
}
}
void
ifmalist_dump(void)
{
struct ifmaddrs *ifmap;
if (getifmaddrs(&ifmap))
err(EX_OSERR, "getifmaddrs");
ifmalist_dump_af(ifmap, AF_LINK);
fputs("\n", stdout);
ifmalist_dump_af(ifmap, AF_INET);
#ifdef INET6
fputs("\n", stdout);
ifmalist_dump_af(ifmap, AF_INET6);
#endif
freeifmaddrs(ifmap);
}
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