mtest.tproj/mtest.c

   1 /*-
   2  * Copyright (c) 2007-2009 Bruce Simpson.
   3  * Copyright (c) 2000 Wilbert De Graaf.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 /*
  32  * Diagnostic and test utility for multicast sockets.
  33  * TODO: Support embedded KAME Scope ID in IPv6 group addresses.
  34  * TODO: Use IPv4 link-local address when source address selection
  35  * is implemented; use MCAST_JOIN_SOURCE for IPv4.
  36  */
  37
  38 #define INET6
  39
  40 #include <sys/cdefs.h>
  41
  42 #include <sys/types.h>
  43 #include <sys/param.h>
  44 #include <sys/errno.h>
  45 #include <sys/socket.h>
  46 #include <sys/time.h>
  47 #include <sys/ioctl.h>
  48
  49 #include <net/if.h>
  50 #include <net/if_dl.h>
  51 #include <net/ethernet.h>
  52 #include <netinet/in.h>
  53 #include <netinet/in_systm.h>
  54 #include <netinet/ip.h>
  55 #include <netinet/ip_var.h>
  56 #ifdef INET6
  57 #include <netinet/in.h>
  58 #include <netinet/ip6.h>
  59 #endif
  60
  61 #include <assert.h>
  62 #include <stdlib.h>
  63 #include <stdio.h>
  64 #include <string.h>
  65 #include <ctype.h>
  66 #include <errno.h>
  67 #include <err.h>
  68 #include <unistd.h>
  69
  70 #include <arpa/inet.h>
  71 #include <netdb.h>
  72 #include <ifaddrs.h>
  73
  74 #ifdef IP_ADD_SOURCE_MEMBERSHIP
  75 #define HAS_SSM 1
  76 #endif
  77
  78 union sockunion {
  79         struct sockaddr_storage ss;
  80         struct sockaddr         sa;
  81         struct sockaddr_dl      sdl;
  82         struct sockaddr_in      sin;
  83 #ifdef INET6
  84         struct sockaddr_in6     sin6;
  85 #endif
  86 };
  87 typedef union sockunion sockunion_t;
  88
  89 union mrequnion {
  90         struct ip_mreq           mr;
  91 #ifdef HAS_SSM
  92         struct ip_mreq_source    mrs;
  93 #endif
  94 #ifdef INET6
  95         struct ipv6_mreq         mr6;
  96 #ifdef HAS_SSM
  97         struct group_source_req  gr;
  98 #endif
  99 #endif
 100 };
 101 typedef union mrequnion mrequnion_t;
 102
 103 #define MAX_ADDRS       20
 104 #define STR_SIZE        64
 105 #define LINE_LENGTH     80
 106
 107 static int      __ifindex_to_primary_ip(const uint32_t, struct in_addr *);
 108 static uint32_t parse_cmd_args(sockunion_t *, sockunion_t *,
 109                                                            const char *, const char *, const char *);
 110 static void     process_file(char *, int, int);
 111 static void     process_cmd(char*, int, int, FILE *);
 112 static int      su_cmp(const void *, const void *);
 113 static void     usage(void);
 114
 115 /*
 116  * Ordering predicate for qsort().
 117  */
 118 static int
 119 su_cmp(const void *a, const void *b)
 120 {
 121         const sockunion_t       *sua = (const sockunion_t *)a;
 122         const sockunion_t       *sub = (const sockunion_t *)b;
 123
 124         assert(sua->sa.sa_family == sub->sa.sa_family);
 125
 126         switch (sua->sa.sa_family) {
 127                 case AF_INET:
 128                         return ((int)(sua->sin.sin_addr.s_addr -
 129                                                   sub->sin.sin_addr.s_addr));
 130                         break;
 131 #ifdef INET6
 132                 case AF_INET6:
 133                         return (memcmp(&sua->sin6.sin6_addr, &sub->sin6.sin6_addr,
 134                                                    sizeof(struct in6_addr)));
 135                         break;
 136 #endif
 137                 default:
 138                         break;
 139         }
 140
 141         assert(sua->sa.sa_len == sub->sa.sa_len);
 142         return (memcmp(sua, sub, sua->sa.sa_len));
 143 }
 144
 145 /*
 146  * Internal: Map an interface index to primary IPv4 address.
 147  * This is somewhat inefficient. This is a useful enough operation
 148  * that it probably belongs in the C library.
 149  * Return zero if found, -1 on error, 1 on not found.
 150  */
 151 static int
 152 __ifindex_to_primary_ip(const uint32_t ifindex, struct in_addr *pina)
 153 {
 154         char             ifname[IFNAMSIZ];
 155         struct ifaddrs  *ifa;
 156         struct ifaddrs  *ifaddrs;
 157         sockunion_t     *psu;
 158         int              retval;
 159
 160         assert(ifindex != 0);
 161
 162         retval = -1;
 163         if (if_indextoname(ifindex, ifname) == NULL)
 164                 return (retval);
 165         if (getifaddrs(&ifaddrs) < 0)
 166                 return (retval);
 167
 168         /*
 169          * Find the ifaddr entry corresponding to the interface name,
 170          * and return the first matching IPv4 address.
 171          */
 172         retval = 1;
 173         for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
 174                 if (strcmp(ifa->ifa_name, ifname) != 0)
 175                         continue;
 176                 psu = (sockunion_t *)ifa->ifa_addr;
 177                 if (psu && psu->sa.sa_family == AF_INET) {
 178                         retval = 0;
 179                         memcpy(pina, &psu->sin.sin_addr,
 180                                    sizeof(struct in_addr));
 181                         break;
 182                 }
 183         }
 184
 185         if (retval != 0)
 186                 errno = EADDRNOTAVAIL;  /* XXX */
 187
 188         freeifaddrs(ifaddrs);
 189         return (retval);
 190 }
 191
 192 int
 193 main(int argc, char **argv)
 194 {
 195         char     line[LINE_LENGTH];
 196         char    *p;
 197         int      i, s, s6;
 198
 199         s = -1;
 200         s6 = -1;
 201         s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 202         if (s == -1)
 203                 err(1, "can't open IPv4 socket");
 204 #ifdef INET6
 205         s6 = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 206         if (s6 == -1)
 207                 err(1, "can't open IPv6 socket");
 208 #endif
 209
 210         if (argc < 2) {
 211                 if (isatty(STDIN_FILENO)) {
 212                         printf("multicast membership test program; "
 213                                    "enter ? for list of commands\n");
 214                 }
 215                 do {
 216                         if (fgets(line, sizeof(line), stdin) != NULL) {
 217                                 if (line[0] != 'f')
 218                                         process_cmd(line, s, s6, stdin);
 219                                 else {
 220                                         /* Get the filename */
 221                                         for (i = 1; isblank(line[i]); i++);
 222                                         if ((p = (char*)strchr(line, '\n'))
 223                                             != NULL)
 224                                                 *p = '\0';
 225                                         process_file(&line[i], s, s6);
 226                                 }
 227                         }
 228                 } while (!feof(stdin));
 229         } else {
 230                 for (i = 1; i < argc; i++) {
 231                         process_file(argv[i], s, s6);
 232                 }
 233         }
 234
 235         if (s != -1)
 236                 close(s);
 237         if (s6 != -1)
 238                 close(s6);
 239
 240         exit (0);
 241 }
 242
 243 static void
 244 process_file(char *fname, int s, int s6)
 245 {
 246         char line[80];
 247         FILE *fp;
 248         char *lineptr;
 249
 250         fp = fopen(fname, "r");
 251         if (fp == NULL) {
 252                 warn("fopen");
 253                 return;
 254         }
 255
 256         /* Skip comments and empty lines. */
 257         while (fgets(line, sizeof(line), fp) != NULL) {
 258                 lineptr = line;
 259                 while (isblank(*lineptr))
 260                         lineptr++;
 261                 if (*lineptr != '#' && *lineptr != '\n')
 262                         process_cmd(lineptr, s, s6, fp);
 263         }
 264
 265         fclose(fp);
 266 }
 267
 268 /*
 269  * Parse join/leave/allow/block arguments, given:
 270  *  str1: group (as AF_INET or AF_INET6 printable)
 271  *  str2: ifname
 272  *  str3: optional source address (may be NULL).
 273  *   This argument must have the same parsed address family as str1.
 274  * Return the ifindex of ifname, or 0 if any parse element failed.
 275  */
 276 static uint32_t
 277 parse_cmd_args(sockunion_t *psu, sockunion_t *psu2,
 278                            const char *str1, const char *str2, const char *str3)
 279 {
 280         struct addrinfo          hints;
 281         struct addrinfo         *res;
 282         uint32_t                 ifindex;
 283         int                      af, error;
 284
 285         assert(psu != NULL);
 286         assert(str1 != NULL);
 287         assert(str2 != NULL);
 288
 289         af = AF_UNSPEC;
 290
 291         ifindex = if_nametoindex(str2);
 292         if (ifindex == 0)
 293                 return (0);
 294
 295         memset(&hints, 0, sizeof(struct addrinfo));
 296         hints.ai_flags = AI_NUMERICHOST;
 297         hints.ai_family = PF_UNSPEC;
 298         hints.ai_socktype = SOCK_DGRAM;
 299
 300         memset(psu, 0, sizeof(sockunion_t));
 301         psu->sa.sa_family = AF_UNSPEC;
 302
 303         error = getaddrinfo(str1, "0", &hints, &res);
 304         if (error) {
 305                 warnx("getaddrinfo: %s", gai_strerror(error));
 306                 return (0);
 307         }
 308         assert(res != NULL);
 309         af = res->ai_family;
 310         memcpy(psu, res->ai_addr, res->ai_addrlen);
 311         freeaddrinfo(res);
 312
 313         /* sscanf() may pass the empty string. */
 314         if (psu2 != NULL && str3 != NULL && *str3 != '\0') {
 315                 memset(psu2, 0, sizeof(sockunion_t));
 316                 psu2->sa.sa_family = AF_UNSPEC;
 317
 318                 /* look for following address family; str3 is *optional*. */
 319                 hints.ai_family = af;
 320                 error = getaddrinfo(str3, "0", &hints, &res);
 321                 if (error) {
 322                         warnx("getaddrinfo: %s", gai_strerror(error));
 323                         ifindex = 0;
 324                 } else {
 325                         if (af != res->ai_family) {
 326                                 errno = EINVAL; /* XXX */
 327                                 ifindex = 0;
 328                         }
 329                         memcpy(psu2, res->ai_addr, res->ai_addrlen);
 330                         freeaddrinfo(res);
 331                 }
 332         }
 333
 334         return (ifindex);
 335 }
 336
 337 static __inline int
 338 af2sock(const int af, int s, int s6)
 339 {
 340
 341         if (af == AF_INET)
 342                 return (s);
 343 #ifdef INET6
 344         if (af == AF_INET6)
 345                 return (s6);
 346 #endif
 347         return (-1);
 348 }
 349
 350 static void
 351 process_cmd(char *cmd, int s, int s6 __unused, FILE *fp __unused)
 352 {
 353         char                     str1[STR_SIZE];
 354         char                     str2[STR_SIZE];
 355         char                     str3[STR_SIZE];
 356         mrequnion_t              mr;
 357         sockunion_t              su, su2;
 358         struct ifreq             ifr;
 359         char                    *line;
 360         char                    *toptname;
 361         void                    *optval;
 362         uint32_t                 fmode, ifindex;
 363         socklen_t                optlen;
 364         int                      af, error, i, level, n = 0, optname;
 365 #ifndef __APPLE__
 366         int                      f, flags;
 367 #endif /* __APPLE__ */
 368
 369         af = AF_UNSPEC;
 370         su.sa.sa_family = AF_UNSPEC;
 371         su2.sa.sa_family = AF_UNSPEC;
 372
 373         line = cmd;
 374         while (isblank(*++line))
 375                 ;       /* Skip whitespace. */
 376
 377         switch (*cmd) {
 378                 case '?':
 379                         usage();
 380                         break;
 381
 382                 case 'q':
 383                         close(s);
 384                         exit(0);
 385
 386                 case 's':
 387                         if ((sscanf(line, "%d", &n) != 1) || (n < 1)) {
 388                                 printf("-1\n");
 389                                 break;
 390                         }
 391                         sleep(n);
 392                         printf("ok\n");
 393                         break;
 394
 395                 case 'j':
 396                 case 'l':
 397                         str3[0] = '\0';
 398                         toptname = "";
 399                         sscanf(line, "%s %s %s", str1, str2, str3);
 400                         ifindex = parse_cmd_args(&su, &su2, str1, str2, str3);
 401                         if (ifindex == 0) {
 402                                 printf("-1\n");
 403                                 break;
 404                         }
 405                         af = su.sa.sa_family;
 406                         if (af == AF_INET) {
 407                                 struct in_addr ina;
 408
 409                                 error = __ifindex_to_primary_ip(ifindex, &ina);
 410                                 if (error != 0) {
 411                                         warn("primary_ip_lookup %s", str2);
 412                                         printf("-1\n");
 413                                         break;
 414                                 }
 415                                 level = IPPROTO_IP;
 416
 417 #ifdef HAS_SSM
 418                                 if (su2.sa.sa_family != AF_UNSPEC) {
 419                                         mr.mrs.imr_multiaddr = su.sin.sin_addr;
 420                                         mr.mrs.imr_sourceaddr = su2.sin.sin_addr;
 421                                         mr.mrs.imr_interface = ina;
 422                                         optname = (*cmd == 'j') ?
 423                                     IP_ADD_SOURCE_MEMBERSHIP :
 424                                     IP_DROP_SOURCE_MEMBERSHIP;
 425                                         toptname = (*cmd == 'j') ?
 426                                     "IP_ADD_SOURCE_MEMBERSHIP" :
 427                                     "IP_DROP_SOURCE_MEMBERSHIP";
 428                                         optval = (void *)&mr.mrs;
 429                                         optlen = sizeof(mr.mrs);
 430                                 } else {
 431 #endif
 432                                         mr.mr.imr_multiaddr = su.sin.sin_addr;
 433                                         mr.mr.imr_interface = ina;
 434                                         optname = (*cmd == 'j') ?
 435                                     IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
 436                                         toptname = (*cmd == 'j') ?
 437                                     "IP_ADD_MEMBERSHIP" : "IP_DROP_MEMBERSHIP";
 438                                         optval = (void *)&mr.mr;
 439                                         optlen = sizeof(mr.mr);
 440 #ifdef HAS_SSM
 441                                 }
 442 #endif
 443                                 if (setsockopt(s, level, optname, optval,
 444                                                            optlen) == 0) {
 445                                         printf("ok\n");
 446                                         break;
 447                                 } else {
 448                                         warn("setsockopt %s", toptname);
 449                                 }
 450                         }
 451 #ifdef INET6
 452                         else
 453 #endif /* INET6 */
 454 #ifdef INET6
 455                                 if (af == AF_INET6) {
 456                                         level = IPPROTO_IPV6;
 457 #ifdef HAS_SSM
 458                                         if (su2.sa.sa_family != AF_UNSPEC) {
 459                                                 mr.gr.gsr_interface = ifindex;
 460                                                 mr.gr.gsr_group = su.ss;
 461                                                 mr.gr.gsr_source = su2.ss;
 462                                                 optname = (*cmd == 'j') ?
 463                                     MCAST_JOIN_SOURCE_GROUP:
 464                                                 MCAST_LEAVE_SOURCE_GROUP;
 465                                                 toptname = (*cmd == 'j') ?
 466                                                 "MCAST_JOIN_SOURCE_GROUP":
 467                                                 "MCAST_LEAVE_SOURCE_GROUP";
 468                                                 optval = (void *)&mr.gr;
 469                                                 optlen = sizeof(mr.gr);
 470                                         } else {
 471 #endif
 472                                                 mr.mr6.ipv6mr_multiaddr = su.sin6.sin6_addr;
 473                                                 mr.mr6.ipv6mr_interface = ifindex;
 474                                                 optname = (*cmd == 'j') ?
 475                                                 IPV6_JOIN_GROUP :
 476                                                 IPV6_LEAVE_GROUP;
 477                                                 toptname = (*cmd == 'j') ?
 478                                                 "IPV6_JOIN_GROUP" :
 479                                                 "IPV6_LEAVE_GROUP";
 480                                                 optval = (void *)&mr.mr6;
 481                                                 optlen = sizeof(mr.mr6);
 482 #ifdef HAS_SSM
 483                                         }
 484 #endif
 485                                         if (setsockopt(s6, level, optname, optval,
 486                                                                    optlen) == 0) {
 487                                                 printf("ok\n");
 488                                                 break;
 489                                         } else {
 490                                                 warn("setsockopt %s", toptname);
 491                                         }
 492                                 }
 493 #endif /* INET6 */
 494                         /* FALLTHROUGH */
 495                         printf("-1\n");
 496                         break;
 497
 498 #ifdef HAS_SSM
 499                         /*
 500                          * Set the socket to include or exclude filter mode, and
 501                          * add some sources to the filterlist, using the full-state API.
 502                          */
 503                 case 'i':
 504                 case 'e': {
 505                         sockunion_t      sources[MAX_ADDRS];
 506                         struct addrinfo  hints;
 507                         struct addrinfo *res;
 508                         char            *cp;
 509                         int              af1;
 510
 511                         n = 0;
 512                         fmode = (*cmd == 'i') ? MCAST_INCLUDE : MCAST_EXCLUDE;
 513                         if ((sscanf(line, "%s %s %d", str1, str2, &n)) != 3) {
 514                                 printf("-1\n");
 515                                 break;
 516                         }
 517
 518                         ifindex = parse_cmd_args(&su, NULL, str1, str2, NULL);
 519                         if (ifindex == 0 || n < 0 || n > MAX_ADDRS) {
 520                                 printf("-1\n");
 521                                 break;
 522                         }
 523                         af = su.sa.sa_family;
 524
 525                         memset(&hints, 0, sizeof(struct addrinfo));
 526                         hints.ai_flags = AI_NUMERICHOST;
 527                         hints.ai_family = af;
 528                         hints.ai_socktype = SOCK_DGRAM;
 529
 530                         for (i = 0; i < n; i++) {
 531                                 sockunion_t *psu = (sockunion_t *)&sources[i];
 532                                 /*
 533                                  * Trim trailing whitespace, as getaddrinfo()
 534                                  * can't cope with it.
 535                                  */
 536                                 fgets(str1, sizeof(str1), fp);
 537                                 cp = strchr(str1, '\n');
 538                                 if (cp != NULL)
 539                                         *cp = '\0';
 540
 541                                 res = NULL;
 542                                 error = getaddrinfo(str1, "0", &hints, &res);
 543                                 if (error)
 544                                         break;
 545                                 assert(res != NULL);
 546
 547                                 memset(psu, 0, sizeof(sockunion_t));
 548                                 af1 = res->ai_family;
 549                                 if (af1 == af)
 550                                         memcpy(psu, res->ai_addr, res->ai_addrlen);
 551                                 freeaddrinfo(res);
 552                                 if (af1 != af)
 553                                         break;
 554                         }
 555                         if (i < n) {
 556                                 if (error)
 557                                         warnx("getaddrinfo: %s", gai_strerror(error));
 558                                 printf("-1\n");
 559                                 break;
 560                         }
 561                         if (setsourcefilter(af2sock(af, s, s6), ifindex,
 562                                                                 &su.sa, su.sa.sa_len, fmode, n, &sources[0].ss) != 0)
 563                                 warn("setsourcefilter");
 564                         else
 565                                 printf("ok\n");
 566                 } break;
 567
 568                         /*
 569                          * Allow or block traffic from a source, using the
 570                          * delta based api.
 571                          */
 572                 case 't':
 573                 case 'b': {
 574                         str3[0] = '\0';
 575                         toptname = "";
 576                         sscanf(line, "%s %s %s", str1, str2, str3);
 577                         ifindex = parse_cmd_args(&su, &su2, str1, str2, str3);
 578                         if (ifindex == 0 || su2.sa.sa_family == AF_UNSPEC) {
 579                                 printf("-1\n");
 580                                 break;
 581                         }
 582                         af = su.sa.sa_family;
 583
 584                         /* First determine our current filter mode. */
 585                         n = 0;
 586                         if (getsourcefilter(af2sock(af, s, s6), ifindex,
 587                                                                 &su.sa, su.sa.sa_len, &fmode, (uint32_t *)&n, NULL) != 0) {
 588                                 warn("getsourcefilter");
 589                                 break;
 590                         }
 591                         if (af == AF_INET) {
 592                                 struct in_addr ina;
 593
 594                                 error = __ifindex_to_primary_ip(ifindex, &ina);
 595                                 if (error != 0) {
 596                                         warn("primary_ip_lookup %s", str2);
 597                                         printf("-1\n");
 598                                         break;
 599                                 }
 600                                 level = IPPROTO_IP;
 601                                 optval = (void *)&mr.mrs;
 602                                 optlen = sizeof(mr.mrs);
 603                                 mr.mrs.imr_multiaddr = su.sin.sin_addr;
 604                                 mr.mrs.imr_sourceaddr = su2.sin.sin_addr;
 605                                 mr.mrs.imr_interface = ina;
 606                                 if (fmode == MCAST_EXCLUDE) {
 607                                         /* Any-source mode socket membership. */
 608                                         optname = (*cmd == 't') ?
 609                                     IP_UNBLOCK_SOURCE :
 610                                     IP_BLOCK_SOURCE;
 611                                         toptname = (*cmd == 't') ?
 612                                     "IP_UNBLOCK_SOURCE" :
 613                                     "IP_BLOCK_SOURCE";
 614                                 } else {
 615                                         /* Source-specific mode socket membership. */
 616                                         optname = (*cmd == 't') ?
 617                                     IP_ADD_SOURCE_MEMBERSHIP :
 618                                     IP_DROP_SOURCE_MEMBERSHIP;
 619                                         toptname = (*cmd == 't') ?
 620                                     "IP_ADD_SOURCE_MEMBERSHIP" :
 621                                     "IP_DROP_SOURCE_MEMBERSHIP";
 622                                 }
 623                                 if (setsockopt(s, level, optname, optval,
 624                                                            optlen) == 0) {
 625                                         printf("ok\n");
 626                                         break;
 627                                 } else {
 628                                         warn("setsockopt %s", toptname);
 629                                 }
 630                         }
 631 #ifdef INET6
 632                         else
 633 #endif /* INET6 */
 634 #ifdef INET6
 635                                 if (af == AF_INET6) {
 636                                         level = IPPROTO_IPV6;
 637                                         mr.gr.gsr_interface = ifindex;
 638                                         mr.gr.gsr_group = su.ss;
 639                                         mr.gr.gsr_source = su2.ss;
 640                                         if (fmode == MCAST_EXCLUDE) {
 641                                                 /* Any-source mode socket membership. */
 642                                                 optname = (*cmd == 't') ?
 643                                                 MCAST_UNBLOCK_SOURCE :
 644                                                 MCAST_BLOCK_SOURCE;
 645                                                 toptname = (*cmd == 't') ?
 646                                                 "MCAST_UNBLOCK_SOURCE" :
 647                                                 "MCAST_BLOCK_SOURCE";
 648                                         } else {
 649                                                 /* Source-specific mode socket membership. */
 650                                                 optname = (*cmd == 't') ?
 651                                                 MCAST_JOIN_SOURCE_GROUP :
 652                                                 MCAST_LEAVE_SOURCE_GROUP;
 653                                                 toptname = (*cmd == 't') ?
 654                                                 "MCAST_JOIN_SOURCE_GROUP":
 655                                                 "MCAST_LEAVE_SOURCE_GROUP";
 656                                         }
 657                                         optval = (void *)&mr.gr;
 658                                         optlen = sizeof(mr.gr);
 659                                         if (setsockopt(s6, level, optname, optval,
 660                                                                    optlen) == 0) {
 661                                                 printf("ok\n");
 662                                                 break;
 663                                         } else {
 664                                                 warn("setsockopt %s", toptname);
 665                                         }
 666                                 }
 667 #endif /* INET6 */
 668                         /* FALLTHROUGH */
 669                         printf("-1\n");
 670                 } break;
 671
 672                 case 'g': {
 673                         sockunion_t      sources[MAX_ADDRS];
 674                         char             addrbuf[NI_MAXHOST];
 675                         int              nreqsrc, nsrc;
 676
 677                         if ((sscanf(line, "%s %s %d", str1, str2, &nreqsrc)) != 3) {
 678                                 printf("-1\n");
 679                                 break;
 680                         }
 681                         ifindex = parse_cmd_args(&su, NULL, str1, str2, NULL);
 682                         if (ifindex == 0 || (n < 0 || n > MAX_ADDRS)) {
 683                                 printf("-1\n");
 684                                 break;
 685                         }
 686
 687                         af = su.sa.sa_family;
 688                         nsrc = nreqsrc;
 689                         if (getsourcefilter(af2sock(af, s, s6), ifindex, &su.sa,
 690                                                                 su.sa.sa_len, &fmode, (uint32_t *)&nsrc,
 691                                                                 &sources[0].ss) != 0) {
 692                                 warn("getsourcefilter");
 693                                 printf("-1\n");
 694                                 break;
 695                         }
 696                         printf("%s\n", (fmode == MCAST_INCLUDE) ? "include" :
 697                                    "exclude");
 698                         printf("%d\n", nsrc);
 699
 700                         nsrc = MIN(nreqsrc, nsrc);
 701                         fprintf(stderr, "hexdump of sources:\n");
 702                         uint8_t *bp = (uint8_t *)&sources[0];
 703                         for (i = 0; i < (nsrc * sizeof(sources[0])); i++) {
 704                                 fprintf(stderr, "%02x", bp[i]);
 705                         }
 706                         fprintf(stderr, "\nend hexdump\n");
 707
 708                         qsort(sources, nsrc, sizeof (sockunion_t), su_cmp);
 709                         for (i = 0; i < nsrc; i++) {
 710                                 sockunion_t *psu = (sockunion_t *)&sources[i];
 711                                 addrbuf[0] = '\0';
 712                                 error = getnameinfo(&psu->sa, psu->sa.sa_len,
 713                                                                         addrbuf, sizeof(addrbuf), NULL, 0,
 714                                                                         NI_NUMERICHOST);
 715                                 if (error)
 716                                         warnx("getnameinfo: %s", gai_strerror(error));
 717                                 else
 718                                         printf("%s\n", addrbuf);
 719                         }
 720                         printf("ok\n");
 721                 } break;
 722 #endif
 723                         /* link-layer stuff follows. */
 724
 725                 case 'a':
 726                 case 'd': {
 727                         struct sockaddr_dl      *dlp;
 728                         struct ether_addr       *ep;
 729
 730                         memset(&ifr, 0, sizeof(struct ifreq));
 731                         dlp = (struct sockaddr_dl *)&ifr.ifr_addr;
 732                         dlp->sdl_len = sizeof(struct sockaddr_dl);
 733                         dlp->sdl_family = AF_LINK;
 734                         dlp->sdl_index = 0;
 735                         dlp->sdl_nlen = 0;
 736                         dlp->sdl_alen = ETHER_ADDR_LEN;
 737                         dlp->sdl_slen = 0;
 738                         if (sscanf(line, "%s %s", str1, str2) != 2) {
 739                                 warnc(EINVAL, "sscanf");
 740                                 break;
 741                         }
 742                         ep = ether_aton(str2);
 743                         if (ep == NULL) {
 744                                 warnc(EINVAL, "ether_aton");
 745                                 break;
 746                         }
 747                         strlcpy(ifr.ifr_name, str1, IF_NAMESIZE);
 748                         memcpy(LLADDR(dlp), ep, ETHER_ADDR_LEN);
 749                         if (ioctl(s, (*cmd == 'a') ? SIOCADDMULTI : SIOCDELMULTI,
 750                                           &ifr) == -1) {
 751                                 warn("ioctl SIOCADDMULTI/SIOCDELMULTI");
 752                                 printf("-1\n");
 753                         } else
 754                                 printf("ok\n");
 755                         break;
 756                 }
 757
 758                 case 'm':
 759                         fprintf(stderr,
 760                                         "warning: IFF_ALLMULTI cannot be set from userland "
 761                                         "in Darwin; command ignored.\n");
 762                         printf("-1\n");
 763                         break;
 764
 765 #ifndef __APPLE__
 766                 case 'p':
 767                         if (sscanf(line, "%s %u", ifr.ifr_name, &f) != 2) {
 768                                 printf("-1\n");
 769                                 break;
 770                         }
 771                         if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1) {
 772                                 warn("ioctl SIOCGIFFLAGS");
 773                                 break;
 774                         }
 775                         flags = (ifr.ifr_flags & 0xffff) | (ifr.ifr_flagshigh << 16);
 776                         if (f == 0) {
 777                                 flags &= ~IFF_PPROMISC;
 778                         } else {
 779                                 flags |= IFF_PPROMISC;
 780                         }
 781                         ifr.ifr_flags = flags & 0xffff;
 782                         ifr.ifr_flagshigh = flags >> 16;
 783                         if (ioctl(s, SIOCSIFFLAGS, &ifr) == -1)
 784                                 warn("ioctl SIOCGIFFLAGS");
 785                         else
 786                                 printf( "changed to 0x%08x\n", flags );
 787                         break;
 788 #endif /* __APPLE__ */
 789                 case '\n':
 790                         break;
 791                 default:
 792                         printf("invalid command\n");
 793                         break;
 794         }
 795 }
 796
 797 static void
 798 usage(void)
 799 {
 800
 801 #ifndef HAS_SSM
 802         printf("j mcast-addr ifname        - join IP multicast group\n");
 803         printf("l mcast-addr ifname        - leave IP multicast group\n");
 804 #else /* HAS_SSM */
 805         printf("j mcast-addr ifname [src-addr] - join IP multicast group\n");
 806         printf("l mcast-addr ifname [src-addr] - leave IP multicast group\n");
 807         printf(
 808                    "i mcast-addr ifname n          - set n include mode src filter\n");
 809         printf(
 810                    "e mcast-addr ifname n          - set n exclude mode src filter\n");
 811         printf("t mcast-addr ifname src-addr  - allow traffic from src\n");
 812         printf("b mcast-addr ifname src-addr  - block traffic from src\n");
 813         printf("g mcast-addr ifname n        - get and show n src filters\n");
 814 #endif
 815         printf("a ifname mac-addr          - add link multicast filter\n");
 816         printf("d ifname mac-addr          - delete link multicast filter\n");
 817         printf("m ifname 1/0               - set/clear ether allmulti flag\n");
 818 #ifndef __APPLE__
 819         printf("p ifname 1/0               - set/clear ether promisc flag\n");
 820 #endif /* __APPLE__ */
 821         printf("f filename                 - read command(s) from file\n");
 822         printf("s seconds                  - sleep for some time\n");
 823         printf("q                          - quit\n");
 824 }
 825