usr.bin/netstat/mcast.c

   1 /*-
   2  * Copyright (c) 2007 Bruce M. Simpson <bms@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 /*
  32  * Print the running system's current multicast group memberships.
  33  * As this relies on getifmaddrs(), it may not be used with a core file.
  34  */
  35
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38 #include <sys/socketvar.h>
  39
  40 #include <net/if.h>
  41 #include <net/if_var.h>
  42 #include <net/if_mib.h>
  43 #include <net/if_types.h>
  44 #include <net/if_dl.h>
  45 #include <net/route.h>
  46 #include <netinet/in.h>
  47 #include <netinet/if_ether.h>
  48 #include <arpa/inet.h>
  49 #include <netdb.h>
  50
  51 #include <ctype.h>
  52 #include <err.h>
  53 #include <ifaddrs.h>
  54 #include <sysexits.h>
  55
  56 #include <stddef.h>
  57 #include <stdarg.h>
  58 #include <stdlib.h>
  59 #include <stdint.h>
  60 #include <stdio.h>
  61 #include <string.h>
  62
  63 #include "netstat.h"
  64
  65 #define __NETSTAT_BURN_BRIDGES
  66
  67 #ifdef __NETSTAT_BURN_BRIDGES
  68
  69 union sockunion {
  70         struct sockaddr_storage ss;
  71         struct sockaddr         sa;
  72         struct sockaddr_dl      sdl;
  73         struct sockaddr_in      sin;
  74         struct sockaddr_in6     sin6;
  75 };
  76 typedef union sockunion sockunion_t;
  77
  78 void ifmalist_dump_af(const struct ifmaddrs * const ifmap, int const af);
  79
  80 void
  81 ifmalist_dump_af(const struct ifmaddrs * const ifmap, int const af)
  82 {
  83         const struct ifmaddrs *ifma;
  84         sockunion_t *psa;
  85         char myifname[IFNAMSIZ];
  86 #ifdef INET6
  87         char addrbuf[INET6_ADDRSTRLEN];
  88 #endif
  89         char *pcolon;
  90         char *pafname, *pifname, *plladdr, *pgroup;
  91 #ifdef INET6
  92         void *in6addr;
  93 #endif
  94
  95         switch (af) {
  96         case AF_INET:
  97                 pafname = "IPv4";
  98                 break;
  99 #ifdef INET6
 100         case AF_INET6:
 101                 pafname = "IPv6";
 102                 break;
 103 #endif
 104         case AF_LINK:
 105                 pafname = "Link-layer";
 106                 break;
 107         default:
 108                 return;         /* XXX */
 109         }
 110
 111         fprintf(stdout, "%s Multicast Group Memberships\n", pafname);
 112         fprintf(stdout, "%-20s\t%-16s\t%s\n", "Group", "Link-layer Address",
 113             "Netif");
 114
 115         for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
 116
 117                 if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
 118                         continue;
 119
 120                 /* Group address */
 121                 psa = (sockunion_t *)ifma->ifma_addr;
 122                 if (psa->sa.sa_family != af)
 123                         continue;
 124
 125                 switch (psa->sa.sa_family) {
 126                 case AF_INET:
 127                         pgroup = inet_ntoa(psa->sin.sin_addr);
 128                         break;
 129 #ifdef INET6
 130                 case AF_INET6:
 131                         in6addr = &psa->sin6.sin6_addr;
 132                         inet_ntop(psa->sa.sa_family, in6addr, addrbuf,
 133                             sizeof(addrbuf));
 134                         pgroup = addrbuf;
 135                         break;
 136 #endif
 137                 case AF_LINK:
 138                         if ((psa->sdl.sdl_alen == ETHER_ADDR_LEN) ||
 139                             (psa->sdl.sdl_type == IFT_ETHER)) {
 140                                 pgroup =
 141 ether_ntoa((struct ether_addr *)&psa->sdl.sdl_data);
 142 #ifdef notyet
 143                         } else {
 144                                 pgroup = addr2ascii(AF_LINK,
 145                                     &psa->sdl,
 146                                     sizeof(struct sockaddr_dl),
 147                                     addrbuf);
 148 #endif
 149                         }
 150                         break;
 151                 default:
 152                         continue;       /* XXX */
 153                 }
 154
 155                 /* Link-layer mapping, if any */
 156                 psa = (sockunion_t *)ifma->ifma_lladdr;
 157                 if (psa != NULL) {
 158                         if (psa->sa.sa_family == AF_LINK) {
 159                                 if ((psa->sdl.sdl_alen == ETHER_ADDR_LEN) ||
 160                                     (psa->sdl.sdl_type == IFT_ETHER)) {
 161                                         /* IEEE 802 */
 162                                         plladdr =
 163 ether_ntoa((struct ether_addr *)&psa->sdl.sdl_data);
 164 #ifdef notyet
 165                                 } else {
 166                                         /* something more exotic */
 167                                         plladdr = addr2ascii(AF_LINK,
 168                                             &psa->sdl,
 169                                             sizeof(struct sockaddr_dl),
 170                                             addrbuf);
 171 #endif
 172                                 }
 173                         } else {
 174                                 /* not a link-layer address */
 175                                 plladdr = "<invalid>";
 176                         }
 177                 } else {
 178                         plladdr = "<none>";
 179                 }
 180
 181                 /* Interface upon which the membership exists */
 182                 psa = (sockunion_t *)ifma->ifma_name;
 183                 if (psa != NULL && psa->sa.sa_family == AF_LINK) {
 184                         strlcpy(myifname, link_ntoa(&psa->sdl), IFNAMSIZ);
 185                         pcolon = strchr(myifname, ':');
 186                         if (pcolon)
 187                                 *pcolon = '\0';
 188                         pifname = myifname;
 189                 } else {
 190                         pifname = "";
 191                 }
 192
 193                 fprintf(stdout, "%-20s\t%-16s\t%s\n", pgroup, plladdr, pifname);
 194         }
 195 }
 196
 197 void
 198 ifmalist_dump(void)
 199 {
 200         struct ifmaddrs *ifmap;
 201
 202         fprintf(stderr,
 203              "WARNING: This functionality is deprecated, and will be removed\n"
 204              "in FreeBSD 7.0. Please consider using ifmcstat(8) instead.\n");
 205
 206         if (getifmaddrs(&ifmap))
 207                 err(EX_OSERR, "getifmaddrs");
 208
 209         ifmalist_dump_af(ifmap, AF_LINK);
 210         fputs("\n", stdout);
 211         ifmalist_dump_af(ifmap, AF_INET);
 212 #ifdef INET6
 213         fputs("\n", stdout);
 214         ifmalist_dump_af(ifmap, AF_INET6);
 215 #endif
 216
 217         freeifmaddrs(ifmap);
 218 }
 219 #endif /* __NETSTAT_BURN_BRIDGES */