netstat.tproj/mcast.c

   1 /*
   2  * Copyright (c) 2008-2010 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 2007 Bruce M. Simpson <bms@FreeBSD.org>
  30  * All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  */
  54
  55 #include <sys/cdefs.h>
  56
  57 /*
  58  * Print the running system's current multicast group memberships.
  59  * As this relies on getifmaddrs(), it may not be used with a core file.
  60  */
  61
  62 #include <sys/types.h>
  63 #include <sys/param.h>
  64 #include <sys/sysctl.h>
  65 #include <sys/ioctl.h>
  66 #include <sys/socket.h>
  67 #include <sys/errno.h>
  68
  69 #include <net/if.h>
  70 #include <net/if_var.h>
  71 #include <net/if_mib.h>
  72 #include <net/if_types.h>
  73 #include <net/if_dl.h>
  74 #include <net/route.h>
  75 #include <netinet/in.h>
  76 #include <netinet/if_ether.h>
  77 #include <netinet/igmp_var.h>
  78 #include <netinet6/mld6_var.h>
  79 #include <arpa/inet.h>
  80 #include <netdb.h>
  81
  82 #include <ctype.h>
  83 #include <err.h>
  84 #include <ifaddrs.h>
  85 #include <sysexits.h>
  86
  87 #include <stddef.h>
  88 #include <stdarg.h>
  89 #include <stdlib.h>
  90 #include <stdint.h>
  91 #include <stdio.h>
  92 #include <string.h>
  93 #include <ifaddrs.h>
  94
  95
  96 #include "netstat.h"
  97
  98 union sockunion {
  99         struct sockaddr_storage ss;
 100         struct sockaddr         sa;
 101         struct sockaddr_dl      sdl;
 102         struct sockaddr_in      sin;
 103         struct sockaddr_in6     sin6;
 104 };
 105 typedef union sockunion sockunion_t;
 106
 107 /*
 108  * This may have been defined in <net/if.h>.  Note that if <net/if.h> is
 109  * to be included it must be included before this header file.
 110  */
 111 #ifndef ifa_broadaddr
 112 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 113 #endif
 114
 115 //struct ifmaddrs {
 116 //      struct ifmaddrs *ifma_next;
 117 //      struct sockaddr *ifma_name;
 118 //      struct sockaddr *ifma_addr;
 119 //      struct sockaddr *ifma_lladdr;
 120 //};
 121
 122 void ifmalist_dump_af(const struct ifmaddrs * const ifmap, int const af);
 123 static int ifmalist_dump_mcstat(struct ifmaddrs *);
 124 static void in_ifinfo(struct igmp_ifinfo *);
 125 static const char *inm_mode(u_int);
 126 static void inm_print_sources_sysctl(uint32_t, struct in_addr);
 127 #ifdef INET6
 128 static void in6_ifinfo(struct mld_ifinfo *);
 129 static void in6m_print_sources_sysctl(uint32_t, struct in6_addr *);
 130 static const char *inet6_n2a(struct in6_addr *);
 131 #endif
 132 static void printb(const char *, unsigned int, const char *);
 133 static const char *sdl_addr_to_hex(const struct sockaddr_dl *, char *, int);
 134
 135 extern char *routename6(struct sockaddr_in6 *);
 136
 137 #define sa_equal(a1, a2)        \
 138         (bcmp((a1), (a2), ((a1))->sa_len) == 0)
 139
 140 #define sa_dl_equal(a1, a2)     \
 141         ((((struct sockaddr_dl *)(a1))->sdl_len ==                      \
 142          ((struct sockaddr_dl *)(a2))->sdl_len) &&                      \
 143          (bcmp(LLADDR((struct sockaddr_dl *)(a1)),                      \
 144                LLADDR((struct sockaddr_dl *)(a2)),                      \
 145                ((struct sockaddr_dl *)(a1))->sdl_alen) == 0))
 146
 147 #define SALIGN  (sizeof(uint32_t) - 1)
 148 #define SA_RLEN(sa)     (sa ? ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : \
 149                             (SALIGN + 1)) : 0)
 150 #define MAX_SYSCTL_TRY  5
 151 #define RTA_MASKS       (RTA_GATEWAY | RTA_IFP | RTA_IFA)
 152
 153 void
 154 ifmalist_dump_af(const struct ifmaddrs * const ifmap, int const af)
 155 {
 156         const struct ifmaddrs *ifma;
 157         sockunion_t *psa;
 158         char myifname[IFNAMSIZ];
 159         char *pcolon;
 160         char *pafname, *pifname, *plladdr = NULL, *pgroup = NULL;
 161
 162         switch (af) {
 163         case AF_INET:
 164                 pafname = "IPv4";
 165                 break;
 166 #ifdef INET6
 167         case AF_INET6:
 168                 pafname = "IPv6";
 169                 break;
 170 #endif
 171         case AF_LINK:
 172                 pafname = "Link-layer";
 173                 break;
 174         default:
 175                 return;         /* XXX */
 176         }
 177
 178         fprintf(stdout, "%s Multicast Group Memberships\n", pafname);
 179         fprintf(stdout, "%-20s\t%-16s\t%s\n", "Group", "Link-layer Address",
 180             "Netif");
 181
 182         for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
 183
 184                 if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
 185                         continue;
 186
 187                 /* Group address */
 188                 psa = (sockunion_t *)ifma->ifma_addr;
 189                 if (psa->sa.sa_family != af)
 190                         continue;
 191
 192                 switch (psa->sa.sa_family) {
 193                 case AF_INET:
 194                         pgroup = inet_ntoa(psa->sin.sin_addr);
 195                         break;
 196 #ifdef INET6
 197                 case AF_INET6:
 198                         pgroup = routename6(&(psa->sin6));
 199                         break;
 200 #endif
 201                 case AF_LINK:
 202                         if ((psa->sdl.sdl_alen == ETHER_ADDR_LEN) ||
 203                             (psa->sdl.sdl_type == IFT_ETHER)) {
 204                                 pgroup =
 205 ether_ntoa((struct ether_addr *)&psa->sdl.sdl_data);
 206 #ifdef notyet
 207                         } else {
 208                                 pgroup = addr2ascii(AF_LINK,
 209                                     &psa->sdl,
 210                                     sizeof(struct sockaddr_dl),
 211                                     addrbuf);
 212 #endif
 213                         }
 214                         break;
 215                 default:
 216                         continue;       /* XXX */
 217                 }
 218
 219                 /* Link-layer mapping, if any */
 220                 psa = (sockunion_t *)ifma->ifma_lladdr;
 221                 if (psa != NULL) {
 222                         if (psa->sa.sa_family == AF_LINK) {
 223                                 if ((psa->sdl.sdl_alen == ETHER_ADDR_LEN) ||
 224                                     (psa->sdl.sdl_type == IFT_ETHER)) {
 225                                         /* IEEE 802 */
 226                                         plladdr =
 227 ether_ntoa((struct ether_addr *)&psa->sdl.sdl_data);
 228 #ifdef notyet
 229                                 } else {
 230                                         /* something more exotic */
 231                                         plladdr = addr2ascii(AF_LINK,
 232                                             &psa->sdl,
 233                                             sizeof(struct sockaddr_dl),
 234                                             addrbuf);
 235 #endif
 236                                 }
 237                         } else {
 238                                 int i;
 239
 240                                 /* not a link-layer address */
 241                                 plladdr = "<invalid>";
 242
 243                                 for (i = 0; psa->sa.sa_len > 2 && i < psa->sa.sa_len - 2; i++)
 244                                         printf("0x%x ", psa->sa.sa_data[i]);
 245                                 printf("\n");
 246                         }
 247                 } else {
 248                         plladdr = "<none>";
 249                 }
 250
 251                 /* Interface upon which the membership exists */
 252                 psa = (sockunion_t *)ifma->ifma_name;
 253                 if (psa != NULL && psa->sa.sa_family == AF_LINK) {
 254                         strlcpy(myifname, link_ntoa(&psa->sdl), IFNAMSIZ);
 255                         pcolon = strchr(myifname, ':');
 256                         if (pcolon)
 257                                 *pcolon = '\0';
 258                         pifname = myifname;
 259                 } else {
 260                         pifname = "";
 261                 }
 262
 263                 fprintf(stdout, "%-20s\t%-16s\t%s\n", pgroup, plladdr, pifname);
 264         }
 265 }
 266
 267 void
 268 ifmalist_dump(void)
 269 {
 270         struct ifmaddrs *ifmap;
 271
 272         if (getifmaddrs(&ifmap))
 273                 err(EX_OSERR, "getifmaddrs");
 274
 275         ifmalist_dump_af(ifmap, AF_LINK);
 276         fputs("\n", stdout);
 277         ifmalist_dump_af(ifmap, AF_INET);
 278 #ifdef INET6
 279         fputs("\n", stdout);
 280         ifmalist_dump_af(ifmap, AF_INET6);
 281 #endif
 282         if (sflag) {
 283                 fputs("\n", stdout);
 284                 ifmalist_dump_mcstat(ifmap);
 285         }
 286
 287         freeifmaddrs(ifmap);
 288 }
 289
 290 static int
 291 ifmalist_dump_mcstat(struct ifmaddrs *ifmap)
 292 {
 293         char                     thisifname[IFNAMSIZ];
 294         char                     addrbuf[NI_MAXHOST];
 295         struct ifaddrs          *ifap, *ifa;
 296         struct ifmaddrs         *ifma;
 297         sockunion_t              lastifasa;
 298         sockunion_t             *psa, *pgsa, *pllsa, *pifasa;
 299         char                    *pcolon;
 300         char                    *pafname;
 301         uint32_t                 lastifindex, thisifindex;
 302         int                      error;
 303         uint32_t                ifindex = 0;
 304
 305         if (interface != NULL)
 306                 ifindex = if_nametoindex(interface);
 307
 308         error = 0;
 309         ifap = NULL;
 310         lastifindex = 0;
 311         thisifindex = 0;
 312         lastifasa.ss.ss_family = AF_UNSPEC;
 313
 314         if (getifaddrs(&ifap) != 0) {
 315                 warn("getifmaddrs");
 316                 return (-1);
 317         }
 318
 319         for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
 320                 error = 0;
 321                 if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
 322                         continue;
 323
 324                 psa = (sockunion_t *)ifma->ifma_name;
 325                 if (psa->sa.sa_family != AF_LINK) {
 326                         fprintf(stderr,
 327                             "WARNING: Kernel returned invalid data.\n");
 328                         error = -1;
 329                         break;
 330                 }
 331
 332                 /* Filter on interface name. */
 333                 thisifindex = psa->sdl.sdl_index;
 334                 if (ifindex != 0 && thisifindex != ifindex)
 335                         continue;
 336
 337                 /* Filter on address family. */
 338                 pgsa = (sockunion_t *)ifma->ifma_addr;
 339                 if (af != 0 && pgsa->sa.sa_family != af)
 340                         continue;
 341
 342                 strlcpy(thisifname, link_ntoa(&psa->sdl), IFNAMSIZ);
 343                 pcolon = strchr(thisifname, ':');
 344                 if (pcolon)
 345                         *pcolon = '\0';
 346
 347                 /* Only print the banner for the first ifmaddrs entry. */
 348                 if (lastifindex == 0 || lastifindex != thisifindex) {
 349                         lastifindex = thisifindex;
 350                         fprintf(stdout, "%s:\n", thisifname);
 351                 }
 352
 353                 /*
 354                  * Currently, multicast joins only take place on the
 355                  * primary IPv4 address, and only on the link-local IPv6
 356                  * address, as per IGMPv2/3 and MLDv1/2 semantics.
 357                  * Therefore, we only look up the primary address on
 358                  * the first pass.
 359                  */
 360                 pifasa = NULL;
 361                 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 362                         if ((strcmp(ifa->ifa_name, thisifname) != 0) ||
 363                             (ifa->ifa_addr == NULL) ||
 364                             (ifa->ifa_addr->sa_family != pgsa->sa.sa_family))
 365                                 continue;
 366                         /*
 367                          * For AF_INET6 only the link-local address should
 368                          * be returned. If built without IPv6 support,
 369                          * skip this address entirely.
 370                          */
 371                         pifasa = (sockunion_t *)ifa->ifa_addr;
 372                         if (pifasa->sa.sa_family == AF_INET6
 373 #ifdef INET6
 374                             && !IN6_IS_ADDR_LINKLOCAL(&pifasa->sin6.sin6_addr)
 375 #endif
 376                         ) {
 377                                 pifasa = NULL;
 378                                 continue;
 379                         }
 380                         break;
 381                 }
 382                 if (pifasa == NULL)
 383                         continue;       /* primary address not found */
 384
 385                 if (!vflag && pifasa->sa.sa_family == AF_LINK)
 386                         continue;
 387
 388                 /* Parse and print primary address, if not already printed. */
 389                 if (lastifasa.ss.ss_family == AF_UNSPEC ||
 390                     ((lastifasa.ss.ss_family == AF_LINK &&
 391                       !sa_dl_equal(&lastifasa.sa, &pifasa->sa)) ||
 392                      !sa_equal(&lastifasa.sa, &pifasa->sa))) {
 393
 394                         switch (pifasa->sa.sa_family) {
 395                         case AF_INET:
 396                                 pafname = "inet";
 397                                 break;
 398                         case AF_INET6:
 399                                 pafname = "inet6";
 400                                 break;
 401                         case AF_LINK:
 402                                 pafname = "link";
 403                                 break;
 404                         default:
 405                                 pafname = "unknown";
 406                                 break;
 407                         }
 408
 409                         switch (pifasa->sa.sa_family) {
 410                         case AF_INET6:
 411 #ifdef INET6
 412                         {
 413                                 const char *p =
 414                                     inet6_n2a(&pifasa->sin6.sin6_addr);
 415                                 strlcpy(addrbuf, p, sizeof(addrbuf));
 416                                 break;
 417                         }
 418 #else
 419                         /* FALLTHROUGH */
 420 #endif
 421                         case AF_INET:
 422                                 error = getnameinfo(&pifasa->sa,
 423                                     pifasa->sa.sa_len,
 424                                     addrbuf, sizeof(addrbuf), NULL, 0,
 425                                     NI_NUMERICHOST);
 426                                 if (error)
 427                                         printf("getnameinfo: %s\n",
 428                                             gai_strerror(error));
 429                                 break;
 430                         case AF_LINK: {
 431                                 (void) sdl_addr_to_hex(&pifasa->sdl, addrbuf,
 432                                     sizeof (addrbuf));
 433                                 break;
 434                         }
 435                         default:
 436                                 addrbuf[0] = '\0';
 437                                 break;
 438                         }
 439
 440                         fprintf(stdout, "\t%s %s\n", pafname, addrbuf);
 441                         /*
 442                          * Print per-link IGMP information, if available.
 443                          */
 444                         if (pifasa->sa.sa_family == AF_INET) {
 445                                 struct igmp_ifinfo igi;
 446                                 size_t mibsize, len;
 447                                 int mib[5];
 448
 449                                 mibsize = sizeof(mib) / sizeof(mib[0]);
 450                                 if (sysctlnametomib("net.inet.igmp.ifinfo",
 451                                     mib, &mibsize) == -1) {
 452                                         perror("sysctlnametomib");
 453                                         goto next_ifnet;
 454                                 }
 455                                 mib[mibsize] = thisifindex;
 456                                 len = sizeof(struct igmp_ifinfo);
 457                                 if (sysctl(mib, mibsize + 1, &igi, &len, NULL,
 458                                     0) == -1) {
 459                                         perror("sysctl net.inet.igmp.ifinfo");
 460                                         goto next_ifnet;
 461                                 }
 462                                 in_ifinfo(&igi);
 463                         }
 464 #ifdef INET6
 465                         /*
 466                          * Print per-link MLD information, if available.
 467                          */
 468                         if (pifasa->sa.sa_family == AF_INET6) {
 469                                 struct mld_ifinfo mli;
 470                                 size_t mibsize, len;
 471                                 int mib[5];
 472
 473                                 mibsize = sizeof(mib) / sizeof(mib[0]);
 474                                 if (sysctlnametomib("net.inet6.mld.ifinfo",
 475                                     mib, &mibsize) == -1) {
 476                                         perror("sysctlnametomib");
 477                                         goto next_ifnet;
 478                                 }
 479                                 mib[mibsize] = thisifindex;
 480                                 len = sizeof(struct mld_ifinfo);
 481                                 if (sysctl(mib, mibsize + 1, &mli, &len, NULL,
 482                                     0) == -1) {
 483                                         perror("sysctl net.inet6.mld.ifinfo");
 484                                         goto next_ifnet;
 485                                 }
 486                                 in6_ifinfo(&mli);
 487                         }
 488 #endif /* INET6 */
 489 #if defined(INET6)
 490 next_ifnet:
 491 #endif
 492                         lastifasa = *pifasa;
 493                 }
 494
 495                 /* Print this group address. */
 496 #ifdef INET6
 497                 if (pgsa->sa.sa_family == AF_INET6) {
 498                         const char *p = inet6_n2a(&pgsa->sin6.sin6_addr);
 499                         strlcpy(addrbuf, p, sizeof(addrbuf));
 500                 } else
 501 #endif
 502                 if (pgsa->sa.sa_family == AF_INET) {
 503                         error = getnameinfo(&pgsa->sa, pgsa->sa.sa_len,
 504                             addrbuf, sizeof(addrbuf), NULL, 0, NI_NUMERICHOST);
 505                         if (error)
 506                                 printf("getnameinfo: %s\n",
 507                                     gai_strerror(error));
 508                 } else {
 509                         (void) sdl_addr_to_hex(&pgsa->sdl, addrbuf,
 510                             sizeof (addrbuf));
 511                 }
 512
 513                 fprintf(stdout, "\t\tgroup %s", addrbuf);
 514                 if (pgsa->sa.sa_family == AF_INET) {
 515                         inm_print_sources_sysctl(thisifindex,
 516                             pgsa->sin.sin_addr);
 517                 }
 518 #ifdef INET6
 519                 if (pgsa->sa.sa_family == AF_INET6) {
 520                         in6m_print_sources_sysctl(thisifindex,
 521                             &pgsa->sin6.sin6_addr);
 522                 }
 523 #endif
 524                 fprintf(stdout, "\n");
 525
 526                 /* Link-layer mapping, if present. */
 527                 pllsa = (sockunion_t *)ifma->ifma_lladdr;
 528                 if (pllsa != NULL) {
 529                         (void) sdl_addr_to_hex(&pllsa->sdl, addrbuf,
 530                             sizeof (addrbuf));
 531                         fprintf(stdout, "\t\t\tmcast-macaddr %s\n", addrbuf);
 532                 }
 533         }
 534
 535         if (ifap != NULL)
 536                 freeifaddrs(ifap);
 537
 538         return (error);
 539 }
 540
 541 static void
 542 in_ifinfo(struct igmp_ifinfo *igi)
 543 {
 544
 545         printf("\t");
 546         switch (igi->igi_version) {
 547         case IGMP_VERSION_1:
 548         case IGMP_VERSION_2:
 549         case IGMP_VERSION_3:
 550                 printf("igmpv%d", igi->igi_version);
 551                 break;
 552         default:
 553                 printf("igmpv?(%d)", igi->igi_version);
 554                 break;
 555         }
 556         printb(" flags", igi->igi_flags, "\020\1SILENT\2LOOPBACK");
 557         if (igi->igi_version == IGMP_VERSION_3) {
 558                 printf(" rv %u qi %u qri %u uri %u",
 559                     igi->igi_rv, igi->igi_qi, igi->igi_qri, igi->igi_uri);
 560         }
 561         if (vflag >= 2) {
 562                 printf(" v1timer %u v2timer %u v3timer %u",
 563                     igi->igi_v1_timer, igi->igi_v2_timer, igi->igi_v3_timer);
 564         }
 565         printf("\n");
 566 }
 567
 568 static const char *inm_modes[] = {
 569         "undefined",
 570         "include",
 571         "exclude",
 572 };
 573
 574 static const char *
 575 inm_mode(u_int mode)
 576 {
 577
 578         if (mode >= MCAST_UNDEFINED && mode <= MCAST_EXCLUDE)
 579                 return (inm_modes[mode]);
 580         return (NULL);
 581 }
 582
 583 /*
 584  * Retrieve per-group source filter mode and lists via sysctl.
 585  */
 586 static void
 587 inm_print_sources_sysctl(uint32_t ifindex, struct in_addr gina)
 588 {
 589 #define MAX_SYSCTL_TRY  5
 590         int mib[7];
 591         int ntry = 0;
 592         size_t mibsize;
 593         size_t len;
 594         size_t needed;
 595         size_t cnt;
 596         int i;
 597         char *buf;
 598         struct in_addr *pina;
 599         uint32_t *p;
 600         uint32_t fmode;
 601         const char *modestr;
 602
 603         mibsize = sizeof(mib) / sizeof(mib[0]);
 604         if (sysctlnametomib("net.inet.ip.mcast.filters", mib, &mibsize) == -1) {
 605                 perror("sysctlnametomib");
 606                 return;
 607         }
 608
 609         needed = 0;
 610         mib[5] = ifindex;
 611         mib[6] = gina.s_addr;   /* 32 bits wide */
 612         mibsize = sizeof(mib) / sizeof(mib[0]);
 613         do {
 614                 if (sysctl(mib, mibsize, NULL, &needed, NULL, 0) == -1) {
 615                         perror("sysctl net.inet.ip.mcast.filters");
 616                         return;
 617                 }
 618                 if ((buf = malloc(needed)) == NULL) {
 619                         perror("malloc");
 620                         return;
 621                 }
 622                 if (sysctl(mib, mibsize, buf, &needed, NULL, 0) == -1) {
 623                         if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
 624                                 perror("sysctl");
 625                                 goto out_free;
 626                         }
 627                         free(buf);
 628                         buf = NULL;
 629                 }
 630         } while (buf == NULL);
 631
 632         len = needed;
 633         if (len < sizeof(uint32_t)) {
 634                 perror("sysctl");
 635                 goto out_free;
 636         }
 637
 638         p = (uint32_t *)buf;
 639         fmode = *p++;
 640         len -= sizeof(uint32_t);
 641
 642         modestr = inm_mode(fmode);
 643         if (modestr)
 644                 printf(" mode %s", modestr);
 645         else
 646                 printf(" mode (%u)", fmode);
 647
 648         if (vflag == 0)
 649                 goto out_free;
 650
 651         cnt = len / sizeof(struct in_addr);
 652         pina = (struct in_addr *)p;
 653
 654         for (i = 0; i < cnt; i++) {
 655                 if (i == 0)
 656                         printf(" srcs ");
 657                 fprintf(stdout, "%s%s", (i == 0 ? "" : ","),
 658                     inet_ntoa(*pina++));
 659                 len -= sizeof(struct in_addr);
 660         }
 661         if (len > 0) {
 662                 fprintf(stderr, "warning: %u trailing bytes from %s\n",
 663                     (unsigned int)len, "net.inet.ip.mcast.filters");
 664         }
 665
 666 out_free:
 667         free(buf);
 668 #undef  MAX_SYSCTL_TRY
 669 }
 670
 671 #ifdef INET6
 672
 673 static void
 674 in6_ifinfo(struct mld_ifinfo *mli)
 675 {
 676
 677         printf("\t");
 678         switch (mli->mli_version) {
 679         case MLD_VERSION_1:
 680         case MLD_VERSION_2:
 681                 printf("mldv%d", mli->mli_version);
 682                 break;
 683         default:
 684                 printf("mldv?(%d)", mli->mli_version);
 685                 break;
 686         }
 687         printb(" flags", mli->mli_flags, "\020\1SILENT");
 688         if (mli->mli_version == MLD_VERSION_2) {
 689                 printf(" rv %u qi %u qri %u uri %u",
 690                     mli->mli_rv, mli->mli_qi, mli->mli_qri, mli->mli_uri);
 691         }
 692         if (vflag >= 2) {
 693                 printf(" v1timer %u v2timer %u", mli->mli_v1_timer,
 694                    mli->mli_v2_timer);
 695         }
 696         printf("\n");
 697 }
 698
 699 /*
 700  * Retrieve MLD per-group source filter mode and lists via sysctl.
 701  *
 702  * Note: The 128-bit IPv6 group addres needs to be segmented into
 703  * 32-bit pieces for marshaling to sysctl. So the MIB name ends
 704  * up looking like this:
 705  *  a.b.c.d.e.ifindex.g[0].g[1].g[2].g[3]
 706  * Assumes that pgroup originated from the kernel, so its components
 707  * are already in network-byte order.
 708  */
 709 static void
 710 in6m_print_sources_sysctl(uint32_t ifindex, struct in6_addr *pgroup)
 711 {
 712 #define MAX_SYSCTL_TRY  5
 713         char addrbuf[INET6_ADDRSTRLEN];
 714         int mib[10];
 715         int ntry = 0;
 716         int *pi;
 717         size_t mibsize;
 718         size_t len;
 719         size_t needed;
 720         size_t cnt;
 721         int i;
 722         char *buf;
 723         struct in6_addr *pina;
 724         uint32_t *p;
 725         uint32_t fmode;
 726         const char *modestr;
 727
 728         mibsize = sizeof(mib) / sizeof(mib[0]);
 729         if (sysctlnametomib("net.inet6.ip6.mcast.filters", mib,
 730             &mibsize) == -1) {
 731                 perror("sysctlnametomib");
 732                 return;
 733         }
 734
 735         needed = 0;
 736         mib[5] = ifindex;
 737         pi = (int *)pgroup;
 738         for (i = 0; i < 4; i++)
 739                 mib[6 + i] = *pi++;
 740
 741         mibsize = sizeof(mib) / sizeof(mib[0]);
 742         do {
 743                 if (sysctl(mib, mibsize, NULL, &needed, NULL, 0) == -1) {
 744                         perror("sysctl net.inet6.ip6.mcast.filters");
 745                         return;
 746                 }
 747                 if ((buf = malloc(needed)) == NULL) {
 748                         perror("malloc");
 749                         return;
 750                 }
 751                 if (sysctl(mib, mibsize, buf, &needed, NULL, 0) == -1) {
 752                         if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
 753                                 perror("sysctl");
 754                                 goto out_free;
 755                         }
 756                         free(buf);
 757                         buf = NULL;
 758                 }
 759         } while (buf == NULL);
 760
 761         len = needed;
 762         if (len < sizeof(uint32_t)) {
 763                 perror("sysctl");
 764                 goto out_free;
 765         }
 766
 767         p = (uint32_t *)buf;
 768         fmode = *p++;
 769         len -= sizeof(uint32_t);
 770
 771         modestr = inm_mode(fmode);
 772         if (modestr)
 773                 printf(" mode %s", modestr);
 774         else
 775                 printf(" mode (%u)", fmode);
 776
 777         if (vflag == 0)
 778                 goto out_free;
 779
 780         cnt = len / sizeof(struct in6_addr);
 781         pina = (struct in6_addr *)p;
 782
 783         for (i = 0; i < cnt; i++) {
 784                 if (i == 0)
 785                         printf(" srcs ");
 786                 inet_ntop(AF_INET6, (const char *)pina++, addrbuf,
 787                     INET6_ADDRSTRLEN);
 788                 fprintf(stdout, "%s%s", (i == 0 ? "" : ","), addrbuf);
 789                 len -= sizeof(struct in6_addr);
 790         }
 791         if (len > 0) {
 792                 fprintf(stderr, "warning: %u trailing bytes from %s\n",
 793                     (unsigned int)len, "net.inet6.ip6.mcast.filters");
 794         }
 795
 796 out_free:
 797         free(buf);
 798 #undef  MAX_SYSCTL_TRY
 799 }
 800
 801 static const char *
 802 inet6_n2a(struct in6_addr *p)
 803 {
 804         static char buf[NI_MAXHOST];
 805         struct sockaddr_in6 sin6;
 806         u_int32_t scopeid;
 807         const int niflags = NI_NUMERICHOST;
 808
 809         memset(&sin6, 0, sizeof(sin6));
 810         sin6.sin6_family = AF_INET6;
 811         sin6.sin6_len = sizeof(struct sockaddr_in6);
 812         sin6.sin6_addr = *p;
 813         if (IN6_IS_ADDR_LINKLOCAL(p) || IN6_IS_ADDR_MC_LINKLOCAL(p) ||
 814             IN6_IS_ADDR_MC_NODELOCAL(p)) {
 815                 scopeid = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
 816                 if (scopeid) {
 817                         sin6.sin6_scope_id = scopeid;
 818                         sin6.sin6_addr.s6_addr[2] = 0;
 819                         sin6.sin6_addr.s6_addr[3] = 0;
 820                 }
 821         }
 822         if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 823             buf, sizeof(buf), NULL, 0, niflags) == 0) {
 824                 return (buf);
 825         } else {
 826                 return ("(invalid)");
 827         }
 828 }
 829 #endif /* INET6 */
 830
 831 /*
 832  * Print a value a la the %b format of the kernel's printf
 833  */
 834 void
 835 printb(const char *s, unsigned int v, const char *bits)
 836 {
 837         int i, any = 0;
 838         char c;
 839
 840         if (bits && *bits == 8)
 841                 printf("%s=%o", s, v);
 842         else
 843                 printf("%s=%x", s, v);
 844         bits++;
 845         if (bits) {
 846                 putchar('<');
 847                 while ((i = *bits++) != '\0') {
 848                         if (v & (1 << (i-1))) {
 849                                 if (any)
 850                                         putchar(',');
 851                                 any = 1;
 852                                 for (; (c = *bits) > 32; bits++)
 853                                         putchar(c);
 854                         } else
 855                                 for (; *bits > 32; bits++)
 856                                         ;
 857                 }
 858                 putchar('>');
 859         }
 860 }
 861
 862 /*
 863  * convert hardware address to hex string for logging errors.
 864   */
 865 static const char *
 866 sdl_addr_to_hex(const struct sockaddr_dl *sdl, char *orig_buf, int buflen)
 867 {
 868         char *buf = orig_buf;
 869         int i;
 870         const u_char *lladdr;
 871         int maxbytes = buflen / 3;
 872
 873         lladdr = (u_char *)(size_t)sdl->sdl_data + sdl->sdl_nlen;
 874
 875         if (maxbytes > sdl->sdl_alen) {
 876                 maxbytes = sdl->sdl_alen;
 877         }
 878         *buf = '\0';
 879         for (i = 0; i < maxbytes; i++) {
 880                 snprintf(buf, 3, "%02x", lladdr[i]);
 881                 buf += 2;
 882                 *buf = (i == maxbytes - 1) ? '\0' : ':';
 883                 buf++;
 884         }
 885         return (orig_buf);
 886 }
 887