usr.sbin/ifmcstat/ifmcstat.c

   1 /*      $KAME: ifmcstat.c,v 1.48 2006/11/15 05:13:59 itojun Exp $       */
   2
   3 /*
   4  * Copyright (c) 2007 Bruce M. Simpson <bms@FreeBSD.org>
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include <sys/socket.h>
  39 #include <sys/queue.h>
  40
  41 #include <net/if.h>
  42 #include <net/if_var.h>
  43 #include <net/if_types.h>
  44 #include <net/if_dl.h>
  45 #include <net/route.h>
  46
  47 #include <netinet/in.h>
  48 #include <netinet/in_var.h>
  49 #include <netinet/in_systm.h>
  50 #include <netinet/ip.h>
  51 #include <netinet/igmp.h>
  52 #ifdef HAVE_IGMPV3
  53 # include <netinet/in_msf.h>
  54 #endif
  55 #define KERNEL
  56 # include <netinet/if_ether.h>
  57 #undef KERNEL
  58 #define _KERNEL
  59 # include <sys/sysctl.h>
  60 # include <netinet/igmp_var.h>
  61 #undef _KERNEL
  62
  63 #ifdef INET6
  64 # ifdef HAVE_MLDV2
  65 #  include <netinet6/in6_msf.h>
  66 # endif
  67 #include <netinet/icmp6.h>
  68 #define _KERNEL
  69 # include <netinet6/mld6_var.h>
  70 #undef _KERNEL
  71 #endif /* INET6 */
  72
  73 #include <arpa/inet.h>
  74 #include <netdb.h>
  75
  76 #include <stddef.h>
  77 #include <stdarg.h>
  78 #include <stdlib.h>
  79 #include <stdint.h>
  80 #include <stdio.h>
  81 #include <stdlib.h>
  82 #include <string.h>
  83
  84 #include <ctype.h>
  85 #include <err.h>
  86 #include <fcntl.h>
  87 #include <kvm.h>
  88 #include <limits.h>
  89 #include <ifaddrs.h>
  90 #include <nlist.h>
  91 #include <sysexits.h>
  92 #include <unistd.h>
  93
  94 /* XXX: This file currently assumes INET and KVM support in the base system. */
  95 #ifndef INET
  96 #define INET
  97 #endif
  98
  99 union sockunion {
 100         struct sockaddr_storage ss;
 101         struct sockaddr         sa;
 102         struct sockaddr_dl      sdl;
 103 #ifdef INET
 104         struct sockaddr_in      sin;
 105 #endif
 106 #ifdef INET6
 107         struct sockaddr_in6     sin6;
 108 #endif
 109 };
 110 typedef union sockunion sockunion_t;
 111
 112 uint32_t        ifindex = 0;
 113 int             af = AF_UNSPEC;
 114
 115 #define sa_equal(a1, a2)        \
 116         (bcmp((a1), (a2), ((a1))->sa_len) == 0)
 117
 118 #define sa_dl_equal(a1, a2)     \
 119         ((((struct sockaddr_dl *)(a1))->sdl_len ==                      \
 120          ((struct sockaddr_dl *)(a2))->sdl_len) &&                      \
 121          (bcmp(LLADDR((struct sockaddr_dl *)(a1)),                      \
 122                LLADDR((struct sockaddr_dl *)(a2)),                      \
 123                ((struct sockaddr_dl *)(a1))->sdl_alen) == 0))
 124
 125 /*
 126  * Most of the code in this utility is to support the use of KVM for
 127  * post-mortem debugging of the multicast code.
 128  */
 129 #ifdef WITH_KVM
 130
 131 #ifdef INET
 132 static void             if_addrlist(struct ifaddr *);
 133 static struct in_multi *
 134                         in_multientry(struct in_multi *);
 135 #ifdef HAVE_IGMPV3
 136 static void             in_addr_slistentry(struct in_addr_slist *, char *);
 137 #endif
 138 #endif /* INET */
 139
 140 #ifdef INET6
 141 static void             if6_addrlist(struct ifaddr *);
 142 static struct in6_multi *
 143                         in6_multientry(struct in6_multi *);
 144 #ifdef HAVE_MLDV2
 145 static void             in6_addr_slistentry(struct in6_addr_slist *, char *);
 146 #endif
 147 static const char *     inet6_n2a(struct in6_addr *);
 148 #endif /* INET6 */
 149
 150 static void             kread(u_long, void *, int);
 151 static int              ifmcstat_kvm(const char *kernel, const char *core);
 152
 153 #define KREAD(addr, buf, type) \
 154         kread((u_long)addr, (void *)buf, sizeof(type))
 155
 156 kvm_t   *kvmd;
 157 struct  nlist nl[] = {
 158         { "_ifnet", 0, 0, 0, 0, },
 159         { "", 0, 0, 0, 0, },
 160 };
 161 #define N_IFNET 0
 162
 163 #endif /* WITH_KVM */
 164
 165 static int              ifmcstat_getifmaddrs(void);
 166 int                     main(int, char **);
 167
 168 int
 169 main(int argc, char **argv)
 170 {
 171         int c, error;
 172 #ifdef WITH_KVM
 173         const char *kernel = NULL;
 174         const char *core = NULL;
 175
 176         /* "ifmcstat [kernel]" format is supported for backward compatiblity */
 177         if (argc == 2)
 178                 kernel = argv[1];
 179 #endif
 180
 181         while ((c = getopt(argc, argv, "i:f:M:N:")) != -1) {
 182                 switch (c) {
 183                 case 'i':
 184                         if ((ifindex = if_nametoindex(optarg)) == 0) {
 185                                 fprintf(stderr, "%s: unknown interface\n",
 186                                     optarg);
 187                                 exit(1);
 188                         }
 189                         break;
 190
 191                 case 'f':
 192 #ifdef INET
 193                         if (strcmp(optarg, "inet") == 0) {
 194                                 af = AF_INET;
 195                                 break;
 196                         }
 197 #endif
 198 #ifdef INET6
 199                         if (strcmp(optarg, "inet6") == 0) {
 200                                 af = AF_INET6;
 201                                 break;
 202                         }
 203 #endif
 204                         fprintf(stderr, "%s: unknown address family\n", optarg);
 205                         exit(1);
 206                         /*NOTREACHED*/
 207                         break;
 208
 209 #ifdef WITH_KVM
 210                 case 'M':
 211                         core = strdup(optarg);
 212                         break;
 213
 214                 case 'N':
 215                         kernel = strdup(optarg);
 216                         break;
 217 #endif
 218
 219                 default:
 220                         fprintf(stderr,
 221                             "usage: ifmcstat [-i interface] [-f address family]"
 222 #ifdef WITH_KVM
 223                             " [-M core] [-N system]"
 224 #endif
 225                             "\n");
 226                         exit(1);
 227                         break;
 228                         /*NOTREACHED*/
 229                 }
 230         }
 231
 232 #ifdef WITH_KVM
 233         error = ifmcstat_kvm(kernel, core);
 234         /*
 235          * If KVM failed, and user did not explicitly specify a core file,
 236          * try the sysctl backend.
 237          */
 238         if (error != 0 && (core == NULL && kernel == NULL))
 239 #endif
 240         error = ifmcstat_getifmaddrs();
 241         if (error != 0)
 242                 exit(1);
 243
 244         exit(0);
 245         /*NOTREACHED*/
 246 }
 247
 248 #ifdef WITH_KVM
 249
 250 static int
 251 ifmcstat_kvm(const char *kernel, const char *core)
 252 {
 253         char    buf[_POSIX2_LINE_MAX], ifname[IFNAMSIZ];
 254         struct  ifnet   *ifp, *nifp, ifnet;
 255
 256         if ((kvmd = kvm_openfiles(kernel, core, NULL, O_RDONLY, buf)) ==
 257             NULL) {
 258                 perror("kvm_openfiles");
 259                 return (-1);
 260         }
 261         if (kvm_nlist(kvmd, nl) < 0) {
 262                 perror("kvm_nlist");
 263                 return (-1);
 264         }
 265         if (nl[N_IFNET].n_value == 0) {
 266                 printf("symbol %s not found\n", nl[N_IFNET].n_name);
 267                 return (-1);
 268         }
 269         KREAD(nl[N_IFNET].n_value, &ifp, struct ifnet *);
 270         while (ifp) {
 271                 KREAD(ifp, &ifnet, struct ifnet);
 272                 nifp = ifnet.if_link.tqe_next;
 273                 if (ifindex && ifindex != ifnet.if_index)
 274                         goto next;
 275
 276                 printf("%s:\n", if_indextoname(ifnet.if_index, ifname));
 277 #ifdef INET
 278                 if_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
 279 #endif
 280 #ifdef INET6
 281                 if6_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
 282 #endif
 283 next:
 284                 ifp = nifp;
 285         }
 286
 287         return (0);
 288 }
 289
 290 static void
 291 kread(u_long addr, void *buf, int len)
 292 {
 293
 294         if (kvm_read(kvmd, addr, buf, len) != len) {
 295                 perror("kvm_read");
 296                 exit(1);
 297         }
 298 }
 299
 300 #ifdef INET6
 301
 302 static const char *
 303 inet6_n2a(struct in6_addr *p)
 304 {
 305         static char buf[NI_MAXHOST];
 306         struct sockaddr_in6 sin6;
 307         u_int32_t scopeid;
 308         const int niflags = NI_NUMERICHOST;
 309
 310         memset(&sin6, 0, sizeof(sin6));
 311         sin6.sin6_family = AF_INET6;
 312         sin6.sin6_len = sizeof(struct sockaddr_in6);
 313         sin6.sin6_addr = *p;
 314         if (IN6_IS_ADDR_LINKLOCAL(p) || IN6_IS_ADDR_MC_LINKLOCAL(p) ||
 315             IN6_IS_ADDR_MC_NODELOCAL(p)) {
 316                 scopeid = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
 317                 if (scopeid) {
 318                         sin6.sin6_scope_id = scopeid;
 319                         sin6.sin6_addr.s6_addr[2] = 0;
 320                         sin6.sin6_addr.s6_addr[3] = 0;
 321                 }
 322         }
 323         if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 324                         buf, sizeof(buf), NULL, 0, niflags) == 0)
 325                 return buf;
 326         else
 327                 return "(invalid)";
 328 }
 329
 330 static void
 331 if6_addrlist(struct ifaddr *ifap)
 332 {
 333         struct ifaddr ifa;
 334         struct sockaddr sa;
 335         struct in6_ifaddr if6a;
 336         struct ifaddr *ifap0;
 337
 338         if (af && af != AF_INET6)
 339                 return;
 340         ifap0 = ifap;
 341         while (ifap) {
 342                 KREAD(ifap, &ifa, struct ifaddr);
 343                 if (ifa.ifa_addr == NULL)
 344                         goto nextifap;
 345                 KREAD(ifa.ifa_addr, &sa, struct sockaddr);
 346                 if (sa.sa_family != PF_INET6)
 347                         goto nextifap;
 348                 KREAD(ifap, &if6a, struct in6_ifaddr);
 349                 printf("\tinet6 %s\n", inet6_n2a(&if6a.ia_addr.sin6_addr));
 350         nextifap:
 351                 ifap = ifa.ifa_link.tqe_next;
 352         }
 353         if (ifap0) {
 354                 struct ifnet ifnet;
 355                 struct ifmultiaddr ifm, *ifmp = 0;
 356                 struct sockaddr_dl sdl;
 357
 358                 KREAD(ifap0, &ifa, struct ifaddr);
 359                 KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
 360                 if (TAILQ_FIRST(&ifnet.if_multiaddrs))
 361                         ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
 362                 while (ifmp) {
 363                         KREAD(ifmp, &ifm, struct ifmultiaddr);
 364                         if (ifm.ifma_addr == NULL)
 365                                 goto nextmulti;
 366                         KREAD(ifm.ifma_addr, &sa, struct sockaddr);
 367                         if (sa.sa_family != AF_INET6)
 368                                 goto nextmulti;
 369                         (void)in6_multientry((struct in6_multi *)
 370                                              ifm.ifma_protospec);
 371                         if (ifm.ifma_lladdr == 0)
 372                                 goto nextmulti;
 373                         KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
 374                         printf("\t\t\tmcast-macaddr %s refcnt %d\n",
 375                                ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
 376                                ifm.ifma_refcount);
 377                     nextmulti:
 378                         ifmp = TAILQ_NEXT(&ifm, ifma_link);
 379                 }
 380         }
 381 }
 382
 383 static struct in6_multi *
 384 in6_multientry(struct in6_multi *mc)
 385 {
 386         struct in6_multi multi;
 387 #ifdef HAVE_MLDV2
 388         struct in6_multi_source src;
 389         struct router6_info rt6i;
 390 #endif
 391
 392         KREAD(mc, &multi, struct in6_multi);
 393         printf("\t\tgroup %s", inet6_n2a(&multi.in6m_addr));
 394         printf(" refcnt %u\n", multi.in6m_refcount);
 395
 396 #ifdef HAVE_MLDV2
 397         if (multi.in6m_rti != NULL) {
 398                 KREAD(multi.in6m_rti, &rt6i, struct router_info);
 399                 printf("\t\t\t");
 400                 switch (rt6i.rt6i_type) {
 401                 case MLD_V1_ROUTER:
 402                         printf("mldv1");
 403                         break;
 404                 case MLD_V2_ROUTER:
 405                         printf("mldv2");
 406                         break;
 407                 default:
 408                         printf("mldv?(%d)", rt6i.rt6i_type);
 409                         break;
 410                 }
 411
 412                 if (multi.in6m_source == NULL) {
 413                         printf("\n");
 414                         return(multi.in6m_entry.le_next);
 415                 }
 416
 417                 KREAD(multi.in6m_source, &src, struct in6_multi_source);
 418                 printf(" mode=%s grpjoin=%d\n",
 419                     src.i6ms_mode == MCAST_INCLUDE ? "include" :
 420                     src.i6ms_mode == MCAST_EXCLUDE ? "exclude" :
 421                     "???",
 422                     src.i6ms_grpjoin);
 423                 in6_addr_slistentry(src.i6ms_cur, "current");
 424                 in6_addr_slistentry(src.i6ms_rec, "recorded");
 425                 in6_addr_slistentry(src.i6ms_in, "included");
 426                 in6_addr_slistentry(src.i6ms_ex, "excluded");
 427                 in6_addr_slistentry(src.i6ms_alw, "allowed");
 428                 in6_addr_slistentry(src.i6ms_blk, "blocked");
 429                 in6_addr_slistentry(src.i6ms_toin, "to-include");
 430                 in6_addr_slistentry(src.i6ms_ex, "to-exclude");
 431         }
 432 #endif
 433         return(multi.in6m_entry.le_next);
 434 }
 435
 436 #ifdef HAVE_MLDV2
 437 static void
 438 in6_addr_slistentry(struct in6_addr_slist *ias, char *heading)
 439 {
 440         struct in6_addr_slist slist;
 441         struct i6as_head head;
 442         struct in6_addr_source src;
 443
 444         if (ias == NULL) {
 445                 printf("\t\t\t\t%s (none)\n", heading);
 446                 return;
 447         }
 448         memset(&slist, 0, sizeof(slist));
 449         KREAD(ias, &slist, struct in6_addr_source);
 450         printf("\t\t\t\t%s (entry num=%d)\n", heading, slist.numsrc);
 451         if (slist.numsrc == 0) {
 452                 return;
 453         }
 454         KREAD(slist.head, &head, struct i6as_head);
 455
 456         KREAD(head.lh_first, &src, struct in6_addr_source);
 457         while (1) {
 458                 printf("\t\t\t\t\tsource %s (ref=%d)\n",
 459                         inet6_n2a(&src.i6as_addr.sin6_addr),
 460                         src.i6as_refcount);
 461                 if (src.i6as_list.le_next == NULL)
 462                         break;
 463                 KREAD(src.i6as_list.le_next, &src, struct in6_addr_source);
 464         }
 465         return;
 466 }
 467 #endif /* HAVE_MLDV2 */
 468
 469 #endif /* INET6 */
 470
 471 #ifdef INET
 472
 473 static void
 474 if_addrlist(struct ifaddr *ifap)
 475 {
 476         struct ifaddr ifa;
 477         struct sockaddr sa;
 478         struct in_ifaddr ia;
 479         struct ifaddr *ifap0;
 480
 481         if (af && af != AF_INET)
 482                 return;
 483         ifap0 = ifap;
 484         while (ifap) {
 485                 KREAD(ifap, &ifa, struct ifaddr);
 486                 if (ifa.ifa_addr == NULL)
 487                         goto nextifap;
 488                 KREAD(ifa.ifa_addr, &sa, struct sockaddr);
 489                 if (sa.sa_family != PF_INET)
 490                         goto nextifap;
 491                 KREAD(ifap, &ia, struct in_ifaddr);
 492                 printf("\tinet %s\n", inet_ntoa(ia.ia_addr.sin_addr));
 493         nextifap:
 494                 ifap = ifa.ifa_link.tqe_next;
 495         }
 496         if (ifap0) {
 497                 struct ifnet ifnet;
 498                 struct ifmultiaddr ifm, *ifmp = 0;
 499                 struct sockaddr_dl sdl;
 500
 501                 KREAD(ifap0, &ifa, struct ifaddr);
 502                 KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
 503                 if (TAILQ_FIRST(&ifnet.if_multiaddrs))
 504                         ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
 505                 while (ifmp) {
 506                         KREAD(ifmp, &ifm, struct ifmultiaddr);
 507                         if (ifm.ifma_addr == NULL)
 508                                 goto nextmulti;
 509                         KREAD(ifm.ifma_addr, &sa, struct sockaddr);
 510                         if (sa.sa_family != AF_INET)
 511                                 goto nextmulti;
 512                         (void)in_multientry((struct in_multi *)
 513                                             ifm.ifma_protospec);
 514                         if (ifm.ifma_lladdr == 0)
 515                                 goto nextmulti;
 516                         KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
 517                         printf("\t\t\tmcast-macaddr %s refcnt %d\n",
 518                                ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
 519                                ifm.ifma_refcount);
 520                     nextmulti:
 521                         ifmp = TAILQ_NEXT(&ifm, ifma_link);
 522                 }
 523         }
 524 }
 525
 526 static struct in_multi *
 527 in_multientry(struct in_multi *mc)
 528 {
 529         struct in_multi multi;
 530         struct router_info rti;
 531 #ifdef HAVE_IGMPV3
 532         struct in_multi_source src;
 533 #endif
 534
 535         KREAD(mc, &multi, struct in_multi);
 536         printf("\t\tgroup %s\n", inet_ntoa(multi.inm_addr));
 537
 538         if (multi.inm_rti != NULL) {
 539                 KREAD(multi.inm_rti, &rti, struct router_info);
 540                 printf("\t\t\t");
 541                 switch (rti.rti_type) {
 542                 case IGMP_V1_ROUTER:
 543                         printf("igmpv1");
 544                         break;
 545                 case IGMP_V2_ROUTER:
 546                         printf("igmpv2");
 547                         break;
 548 #ifdef HAVE_IGMPV3
 549                 case IGMP_V3_ROUTER:
 550                         printf("igmpv3");
 551                         break;
 552 #endif
 553                 default:
 554                         printf("igmpv?(%d)", rti.rti_type);
 555                         break;
 556                 }
 557
 558 #ifdef HAVE_IGMPV3
 559                 if (multi.inm_source == NULL) {
 560                         printf("\n");
 561                         return (multi.inm_list.le_next);
 562                 }
 563
 564                 KREAD(multi.inm_source, &src, struct in_multi_source);
 565                 printf(" mode=%s grpjoin=%d\n",
 566                     src.ims_mode == MCAST_INCLUDE ? "include" :
 567                     src.ims_mode == MCAST_EXCLUDE ? "exclude" :
 568                     "???",
 569                     src.ims_grpjoin);
 570                 in_addr_slistentry(src.ims_cur, "current");
 571                 in_addr_slistentry(src.ims_rec, "recorded");
 572                 in_addr_slistentry(src.ims_in, "included");
 573                 in_addr_slistentry(src.ims_ex, "excluded");
 574                 in_addr_slistentry(src.ims_alw, "allowed");
 575                 in_addr_slistentry(src.ims_blk, "blocked");
 576                 in_addr_slistentry(src.ims_toin, "to-include");
 577                 in_addr_slistentry(src.ims_ex, "to-exclude");
 578 #else
 579                 printf("\n");
 580 #endif
 581         }
 582
 583         return (NULL);
 584 }
 585
 586 #ifdef HAVE_IGMPV3
 587 static void
 588 in_addr_slistentry(struct in_addr_slist *ias, char *heading)
 589 {
 590         struct in_addr_slist slist;
 591         struct ias_head head;
 592         struct in_addr_source src;
 593
 594         if (ias == NULL) {
 595                 printf("\t\t\t\t%s (none)\n", heading);
 596                 return;
 597         }
 598         memset(&slist, 0, sizeof(slist));
 599         KREAD(ias, &slist, struct in_addr_source);
 600         printf("\t\t\t\t%s (entry num=%d)\n", heading, slist.numsrc);
 601         if (slist.numsrc == 0) {
 602                 return;
 603         }
 604         KREAD(slist.head, &head, struct ias_head);
 605
 606         KREAD(head.lh_first, &src, struct in_addr_source);
 607         while (1) {
 608                 printf("\t\t\t\t\tsource %s (ref=%d)\n",
 609                         inet_ntoa(src.ias_addr.sin_addr), src.ias_refcount);
 610                 if (src.ias_list.le_next == NULL)
 611                         break;
 612                 KREAD(src.ias_list.le_next, &src, struct in_addr_source);
 613         }
 614         return;
 615 }
 616 #endif /* HAVE_IGMPV3 */
 617
 618 #endif /* INET */
 619
 620 #endif /* WITH_KVM */
 621
 622 static int
 623 ifmcstat_getifmaddrs(void)
 624 {
 625         char                     thisifname[IFNAMSIZ];
 626         char                     addrbuf[INET6_ADDRSTRLEN];
 627         struct ifaddrs          *ifap, *ifa;
 628         struct ifmaddrs         *ifmap, *ifma;
 629         sockunion_t              lastifasa;
 630         sockunion_t             *psa, *pgsa, *pllsa, *pifasa;
 631         char                    *pcolon;
 632         char                    *pafname;
 633         uint32_t                 lastifindex, thisifindex;
 634         int                      error;
 635
 636         error = 0;
 637         ifap = NULL;
 638         ifmap = NULL;
 639         lastifindex = 0;
 640         thisifindex = 0;
 641         lastifasa.ss.ss_family = AF_UNSPEC;
 642
 643         if (getifaddrs(&ifap) != 0) {
 644                 warn("getifmaddrs");
 645                 return (-1);
 646         }
 647
 648         if (getifmaddrs(&ifmap) != 0) {
 649                 warn("getifmaddrs");
 650                 error = -1;
 651                 goto out;
 652         }
 653
 654         for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
 655                 error = 0;
 656                 if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
 657                         continue;
 658
 659                 psa = (sockunion_t *)ifma->ifma_name;
 660                 if (psa->sa.sa_family != AF_LINK) {
 661                         fprintf(stderr,
 662                             "WARNING: Kernel returned invalid data.\n");
 663                         error = -1;
 664                         break;
 665                 }
 666
 667                 /* Filter on interface name. */
 668                 thisifindex = psa->sdl.sdl_index;
 669                 if (ifindex != 0 && thisifindex != ifindex)
 670                         continue;
 671
 672                 /* Filter on address family. */
 673                 pgsa = (sockunion_t *)ifma->ifma_addr;
 674                 if (af != 0 && pgsa->sa.sa_family != af)
 675                         continue;
 676
 677                 strlcpy(thisifname, link_ntoa(&psa->sdl), IFNAMSIZ);
 678                 pcolon = strchr(thisifname, ':');
 679                 if (pcolon)
 680                         *pcolon = '\0';
 681
 682                 /* Only print the banner for the first ifmaddrs entry. */
 683                 if (lastifindex == 0 || lastifindex != thisifindex) {
 684                         lastifindex = thisifindex;
 685                         fprintf(stdout, "%s:\n", thisifname);
 686                 }
 687
 688                 /*
 689                  * Currently, multicast joins only take place on the
 690                  * primary IPv4 address, and only on the link-local IPv6
 691                  * address, as per IGMPv2/3 and MLDv1/2 semantics.
 692                  * Therefore, we only look up the primary address on
 693                  * the first pass.
 694                  */
 695                 pifasa = NULL;
 696                 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 697                         if ((strcmp(ifa->ifa_name, thisifname) != 0) ||
 698                             (ifa->ifa_addr == NULL) ||
 699                             (ifa->ifa_addr->sa_family != pgsa->sa.sa_family))
 700                                 continue;
 701 #ifdef INET6
 702                         /*
 703                          * For AF_INET6 only the link-local address should
 704                          * be returned.
 705                          * XXX: ifmcstat actually prints all of the inet6
 706                          * addresses, but never mind...
 707                          */
 708                         pifasa = (sockunion_t *)ifa->ifa_addr;
 709                         if (pifasa->sa.sa_family == AF_INET6 &&
 710                             !IN6_IS_ADDR_LINKLOCAL(&pifasa->sin6.sin6_addr)) {
 711                                 pifasa = NULL;
 712                                 continue;
 713                         }
 714 #endif
 715                         break;
 716                 }
 717                 if (pifasa == NULL)
 718                         continue;       /* primary address not found */
 719
 720                 /* Parse and print primary address, if not already printed. */
 721                 if (lastifasa.ss.ss_family == AF_UNSPEC ||
 722                     ((lastifasa.ss.ss_family == AF_LINK &&
 723                       !sa_dl_equal(&lastifasa.sa, &pifasa->sa)) ||
 724                      !sa_equal(&lastifasa.sa, &pifasa->sa))) {
 725
 726                         switch (pifasa->sa.sa_family) {
 727                         case AF_INET:
 728                                 pafname = "inet";
 729                                 break;
 730                         case AF_INET6:
 731                                 pafname = "inet6";
 732                                 break;
 733                         case AF_LINK:
 734                                 pafname = "link";
 735                                 break;
 736                         default:
 737                                 pafname = "unknown";
 738                                 break;
 739                         }
 740
 741                         switch (pifasa->sa.sa_family) {
 742                         case AF_INET:
 743                         case AF_INET6:
 744                         case AF_LINK:
 745                                 error = getnameinfo(&pifasa->sa,
 746                                     pifasa->sa.sa_len,
 747                                     addrbuf, sizeof(addrbuf), NULL, 0,
 748                                     NI_NUMERICHOST);
 749                                 if (error)
 750                                         perror("getnameinfo");
 751                                 break;
 752                         default:
 753                                 addrbuf[0] = '\0';
 754                                 break;
 755                         }
 756
 757                         fprintf(stdout, "\t%s %s\n", pafname, addrbuf);
 758                         lastifasa = *pifasa;
 759                 }
 760
 761                 /* Print this group address. */
 762                 error = getnameinfo(&pgsa->sa, pgsa->sa.sa_len, addrbuf,
 763                     sizeof(addrbuf), NULL, 0, NI_NUMERICHOST);
 764                 if (error)
 765                         perror("getnameinfo");
 766                 fprintf(stdout, "\t\tgroup %s\n", addrbuf);
 767
 768                 /* Link-layer mapping, if present. */
 769                 pllsa = (sockunion_t *)ifma->ifma_lladdr;
 770                 if (pllsa != NULL) {
 771                         error = getnameinfo(&pllsa->sa, pllsa->sa.sa_len,
 772                             addrbuf, sizeof(addrbuf), NULL, 0, NI_NUMERICHOST);
 773                         fprintf(stdout, "\t\t\tmcast-macaddr %s\n", addrbuf);
 774                 }
 775         }
 776 out:
 777         if (ifmap != NULL)
 778                 freeifmaddrs(ifmap);
 779         if (ifap != NULL)
 780                 freeifaddrs(ifap);
 781
 782         return (error);
 783 }