sbin/ifconfig/ifmedia.c

   1 /*      $NetBSD: ifconfig.c,v 1.34 1997/04/21 01:17:58 lukem Exp $      */
   2 /* $FreeBSD$ */
   3
   4 /*
   5  * Copyright (c) 1997 Jason R. Thorpe.
   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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed for the NetBSD Project
  19  *      by Jason R. Thorpe.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  28  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  30  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  31  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 /*
  37  * Copyright (c) 1983, 1993
  38  *      The Regents of the University of California.  All rights reserved.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  * 3. All advertising materials mentioning features or use of this software
  49  *    must display the following acknowledgement:
  50  *      This product includes software developed by the University of
  51  *      California, Berkeley and its contributors.
  52  * 4. Neither the name of the University nor the names of its contributors
  53  *    may be used to endorse or promote products derived from this software
  54  *    without specific prior written permission.
  55  *
  56  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  57  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  58  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  59  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  60  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  61  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  62  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  63  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  64  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  65  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  66  * SUCH DAMAGE.
  67  */
  68
  69 #include <sys/param.h>
  70 #include <sys/ioctl.h>
  71 #include <sys/socket.h>
  72 #include <sys/sysctl.h>
  73 #include <sys/time.h>
  74
  75 #include <net/if.h>
  76 #include <net/if_dl.h>
  77 #include <net/if_types.h>
  78 #include <net/if_media.h>
  79 #include <net/route.h>
  80
  81 #include <ctype.h>
  82 #include <err.h>
  83 #include <errno.h>
  84 #include <fcntl.h>
  85 #include <stdio.h>
  86 #include <stdlib.h>
  87 #include <string.h>
  88 #include <unistd.h>
  89
  90 #include "ifconfig.h"
  91
  92 static void     domediaopt(const char *, int, int);
  93 static int      get_media_subtype(int, const char *);
  94 static int      get_media_options(int, const char *);
  95 static int      lookup_media_word(struct ifmedia_description *, const char *);
  96 static void     print_media_word(int, int);
  97 static void     print_media_word_ifconfig(int);
  98
  99 static struct ifmedia_description *get_toptype_desc(int);
 100 static struct ifmedia_type_to_subtype *get_toptype_ttos(int);
 101 static struct ifmedia_description *get_subtype_desc(int,
 102     struct ifmedia_type_to_subtype *ttos);
 103
 104 void
 105 media_status(int s, struct rt_addrinfo *info __unused)
 106 {
 107         struct ifmediareq ifmr;
 108         int *media_list, i;
 109
 110         (void) memset(&ifmr, 0, sizeof(ifmr));
 111         (void) strncpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));
 112
 113         if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
 114                 /*
 115                  * Interface doesn't support SIOC{G,S}IFMEDIA.
 116                  */
 117                 return;
 118         }
 119
 120         if (ifmr.ifm_count == 0) {
 121                 warnx("%s: no media types?", name);
 122                 return;
 123         }
 124
 125         media_list = (int *)malloc(ifmr.ifm_count * sizeof(int));
 126         if (media_list == NULL)
 127                 err(1, "malloc");
 128         ifmr.ifm_ulist = media_list;
 129
 130         if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
 131                 err(1, "SIOCGIFMEDIA");
 132
 133         printf("\tmedia: ");
 134         print_media_word(ifmr.ifm_current, 1);
 135         if (ifmr.ifm_active != ifmr.ifm_current) {
 136                 putchar(' ');
 137                 putchar('(');
 138                 print_media_word(ifmr.ifm_active, 0);
 139                 putchar(')');
 140         }
 141
 142         putchar('\n');
 143
 144         if (ifmr.ifm_status & IFM_AVALID) {
 145                 printf("\tstatus: ");
 146                 switch (IFM_TYPE(ifmr.ifm_active)) {
 147                 case IFM_ETHER:
 148                         if (ifmr.ifm_status & IFM_ACTIVE)
 149                                 printf("active");
 150                         else
 151                                 printf("no carrier");
 152                         break;
 153
 154                 case IFM_FDDI:
 155                 case IFM_TOKEN:
 156                         if (ifmr.ifm_status & IFM_ACTIVE)
 157                                 printf("inserted");
 158                         else
 159                                 printf("no ring");
 160                         break;
 161                 case IFM_IEEE80211:
 162                         /* XXX: Different value for adhoc? */
 163                         if (ifmr.ifm_status & IFM_ACTIVE)
 164                                 printf("associated");
 165                         else
 166                                 printf("no carrier");
 167                         break;
 168                 }
 169                 putchar('\n');
 170         }
 171
 172         if (ifmr.ifm_count > 0 && supmedia) {
 173                 printf("\tsupported media:\n");
 174                 for (i = 0; i < ifmr.ifm_count; i++) {
 175                         printf("\t\t");
 176                         print_media_word_ifconfig(media_list[i]);
 177                         putchar('\n');
 178                 }
 179         }
 180
 181         free(media_list);
 182 }
 183
 184 void
 185 setmedia(const char *val, int d, int s, const struct afswtch *afp)
 186 {
 187         struct ifmediareq ifmr;
 188         int first_type, subtype;
 189
 190         (void) memset(&ifmr, 0, sizeof(ifmr));
 191         (void) strncpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));
 192
 193         ifmr.ifm_count = 1;
 194         ifmr.ifm_ulist = &first_type;
 195         if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
 196                 /*
 197                  * If we get E2BIG, the kernel is telling us
 198                  * that there are more, so we can ignore it.
 199                  */
 200                 if (errno != E2BIG)
 201                         err(1, "SIOCGIFMEDIA");
 202         }
 203
 204         if (ifmr.ifm_count == 0)
 205                 errx(1, "%s: no media types?", name);
 206
 207         /*
 208          * We are primarily concerned with the top-level type.
 209          * However, "current" may be only IFM_NONE, so we just look
 210          * for the top-level type in the first "supported type"
 211          * entry.
 212          *
 213          * (I'm assuming that all supported media types for a given
 214          * interface will be the same top-level type..)
 215          */
 216         subtype = get_media_subtype(IFM_TYPE(first_type), val);
 217
 218         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 219         ifr.ifr_media = (ifmr.ifm_current & ~(IFM_NMASK|IFM_TMASK)) |
 220             IFM_TYPE(first_type) | subtype;
 221
 222         if (ioctl(s, SIOCSIFMEDIA, (caddr_t)&ifr) < 0)
 223                 err(1, "SIOCSIFMEDIA");
 224 }
 225
 226 void
 227 setmediaopt(const char *val, int d, int s, const struct afswtch *afp)
 228 {
 229
 230         domediaopt(val, 0, s);
 231 }
 232
 233 void
 234 unsetmediaopt(const char *val, int d, int s, const struct afswtch *afp)
 235 {
 236
 237         domediaopt(val, 1, s);
 238 }
 239
 240 static void
 241 domediaopt(const char *val, int clear, int s)
 242 {
 243         struct ifmediareq ifmr;
 244         int *mwords, options;
 245
 246         (void) memset(&ifmr, 0, sizeof(ifmr));
 247         (void) strncpy(ifmr.ifm_name, name, sizeof(ifmr.ifm_name));
 248
 249         /*
 250          * We must go through the motions of reading all
 251          * supported media because we need to know both
 252          * the current media type and the top-level type.
 253          */
 254
 255         if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
 256                 err(1, "SIOCGIFMEDIA");
 257
 258         if (ifmr.ifm_count == 0)
 259                 errx(1, "%s: no media types?", name);
 260
 261         mwords = (int *)malloc(ifmr.ifm_count * sizeof(int));
 262         if (mwords == NULL)
 263                 err(1, "malloc");
 264
 265         ifmr.ifm_ulist = mwords;
 266         if (ioctl(s, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0)
 267                 err(1, "SIOCGIFMEDIA");
 268
 269         options = get_media_options(IFM_TYPE(mwords[0]), val);
 270
 271         free(mwords);
 272
 273         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 274         ifr.ifr_media = ifmr.ifm_current;
 275         if (clear)
 276                 ifr.ifr_media &= ~options;
 277         else
 278                 ifr.ifr_media |= options;
 279
 280         if (ioctl(s, SIOCSIFMEDIA, (caddr_t)&ifr) < 0)
 281                 err(1, "SIOCSIFMEDIA");
 282 }
 283
 284 /**********************************************************************
 285  * A good chunk of this is duplicated from sys/net/ifmedia.c
 286  **********************************************************************/
 287
 288 static struct ifmedia_description ifm_type_descriptions[] =
 289     IFM_TYPE_DESCRIPTIONS;
 290
 291 static struct ifmedia_description ifm_subtype_ethernet_descriptions[] =
 292     IFM_SUBTYPE_ETHERNET_DESCRIPTIONS;
 293
 294 static struct ifmedia_description ifm_subtype_ethernet_aliases[] =
 295     IFM_SUBTYPE_ETHERNET_ALIASES;
 296
 297 static struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] =
 298     IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS;
 299
 300 static struct ifmedia_description ifm_subtype_tokenring_descriptions[] =
 301     IFM_SUBTYPE_TOKENRING_DESCRIPTIONS;
 302
 303 static struct ifmedia_description ifm_subtype_tokenring_aliases[] =
 304     IFM_SUBTYPE_TOKENRING_ALIASES;
 305
 306 static struct ifmedia_description ifm_subtype_tokenring_option_descriptions[] =
 307     IFM_SUBTYPE_TOKENRING_OPTION_DESCRIPTIONS;
 308
 309 static struct ifmedia_description ifm_subtype_fddi_descriptions[] =
 310     IFM_SUBTYPE_FDDI_DESCRIPTIONS;
 311
 312 static struct ifmedia_description ifm_subtype_fddi_aliases[] =
 313     IFM_SUBTYPE_FDDI_ALIASES;
 314
 315 static struct ifmedia_description ifm_subtype_fddi_option_descriptions[] =
 316     IFM_SUBTYPE_FDDI_OPTION_DESCRIPTIONS;
 317
 318 static struct ifmedia_description ifm_subtype_ieee80211_descriptions[] =
 319     IFM_SUBTYPE_IEEE80211_DESCRIPTIONS;
 320
 321 static struct ifmedia_description ifm_subtype_ieee80211_aliases[] =
 322     IFM_SUBTYPE_IEEE80211_ALIASES;
 323
 324 static struct ifmedia_description ifm_subtype_ieee80211_option_descriptions[] =
 325     IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS;
 326
 327 static struct ifmedia_description ifm_subtype_shared_descriptions[] =
 328     IFM_SUBTYPE_SHARED_DESCRIPTIONS;
 329
 330 static struct ifmedia_description ifm_subtype_shared_aliases[] =
 331     IFM_SUBTYPE_SHARED_ALIASES;
 332
 333 static struct ifmedia_description ifm_shared_option_descriptions[] =
 334     IFM_SHARED_OPTION_DESCRIPTIONS;
 335
 336 struct ifmedia_type_to_subtype {
 337         struct {
 338                 struct ifmedia_description *desc;
 339                 int alias;
 340         } subtypes[5];
 341         struct {
 342                 struct ifmedia_description *desc;
 343                 int alias;
 344         } options[3];
 345 };
 346
 347 /* must be in the same order as IFM_TYPE_DESCRIPTIONS */
 348 static struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = {
 349         {
 350                 {
 351                         { &ifm_subtype_shared_descriptions[0], 0 },
 352                         { &ifm_subtype_shared_aliases[0], 1 },
 353                         { &ifm_subtype_ethernet_descriptions[0], 0 },
 354                         { &ifm_subtype_ethernet_aliases[0], 1 },
 355                         { NULL, 0 },
 356                 },
 357                 {
 358                         { &ifm_shared_option_descriptions[0], 0 },
 359                         { &ifm_subtype_ethernet_option_descriptions[0], 0 },
 360                         { NULL, 0 },
 361                 },
 362         },
 363         {
 364                 {
 365                         { &ifm_subtype_shared_descriptions[0], 0 },
 366                         { &ifm_subtype_shared_aliases[0], 1 },
 367                         { &ifm_subtype_tokenring_descriptions[0], 0 },
 368                         { &ifm_subtype_tokenring_aliases[0], 1 },
 369                         { NULL, 0 },
 370                 },
 371                 {
 372                         { &ifm_shared_option_descriptions[0], 0 },
 373                         { &ifm_subtype_tokenring_option_descriptions[0], 0 },
 374                         { NULL, 0 },
 375                 },
 376         },
 377         {
 378                 {
 379                         { &ifm_subtype_shared_descriptions[0], 0 },
 380                         { &ifm_subtype_shared_aliases[0], 1 },
 381                         { &ifm_subtype_fddi_descriptions[0], 0 },
 382                         { &ifm_subtype_fddi_aliases[0], 1 },
 383                         { NULL, 0 },
 384                 },
 385                 {
 386                         { &ifm_shared_option_descriptions[0], 0 },
 387                         { &ifm_subtype_fddi_option_descriptions[0], 0 },
 388                         { NULL, 0 },
 389                 },
 390         },
 391         {
 392                 {
 393                         { &ifm_subtype_shared_descriptions[0], 0 },
 394                         { &ifm_subtype_shared_aliases[0], 1 },
 395                         { &ifm_subtype_ieee80211_descriptions[0], 0 },
 396                         { &ifm_subtype_ieee80211_aliases[0], 1 },
 397                         { NULL, 0 },
 398                 },
 399                 {
 400                         { &ifm_shared_option_descriptions[0], 0 },
 401                         { &ifm_subtype_ieee80211_option_descriptions[0], 0 },
 402                         { NULL, 0 },
 403                 },
 404         },
 405 };
 406
 407 static int
 408 get_media_subtype(int type, const char *val)
 409 {
 410         struct ifmedia_description *desc;
 411         struct ifmedia_type_to_subtype *ttos;
 412         int rval, i;
 413
 414         /* Find the top-level interface type. */
 415         for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
 416             desc->ifmt_string != NULL; desc++, ttos++)
 417                 if (type == desc->ifmt_word)
 418                         break;
 419         if (desc->ifmt_string == NULL)
 420                 errx(1, "unknown media type 0x%x", type);
 421
 422         for (i = 0; ttos->subtypes[i].desc != NULL; i++) {
 423                 rval = lookup_media_word(ttos->subtypes[i].desc, val);
 424                 if (rval != -1)
 425                         return (rval);
 426         }
 427         errx(1, "unknown media subtype: %s", val);
 428         /* NOTREACHED */
 429 }
 430
 431 static int
 432 get_media_options(int type, const char *val)
 433 {
 434         struct ifmedia_description *desc;
 435         struct ifmedia_type_to_subtype *ttos;
 436         char *optlist, *optptr;
 437         int option = 0, i, rval = 0;
 438
 439         /* We muck with the string, so copy it. */
 440         optlist = strdup(val);
 441         if (optlist == NULL)
 442                 err(1, "strdup");
 443
 444         /* Find the top-level interface type. */
 445         for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
 446             desc->ifmt_string != NULL; desc++, ttos++)
 447                 if (type == desc->ifmt_word)
 448                         break;
 449         if (desc->ifmt_string == NULL)
 450                 errx(1, "unknown media type 0x%x", type);
 451
 452         /*
 453          * Look up the options in the user-provided comma-separated
 454          * list.
 455          */
 456         optptr = optlist;
 457         for (; (optptr = strtok(optptr, ",")) != NULL; optptr = NULL) {
 458                 for (i = 0; ttos->options[i].desc != NULL; i++) {
 459                         option = lookup_media_word(ttos->options[i].desc, optptr);
 460                         if (option != -1)
 461                                 break;
 462                 }
 463                 if (option == 0)
 464                         errx(1, "unknown option: %s", optptr);
 465                 rval |= option;
 466         }
 467
 468         free(optlist);
 469         return (rval);
 470 }
 471
 472 static int
 473 lookup_media_word(struct ifmedia_description *desc, const char *val)
 474 {
 475
 476         for (; desc->ifmt_string != NULL; desc++)
 477                 if (strcasecmp(desc->ifmt_string, val) == 0)
 478                         return (desc->ifmt_word);
 479
 480         return (-1);
 481 }
 482
 483 static struct ifmedia_description *get_toptype_desc(int ifmw)
 484 {
 485         struct ifmedia_description *desc;
 486
 487         for (desc = ifm_type_descriptions; desc->ifmt_string != NULL; desc++)
 488                 if (IFM_TYPE(ifmw) == desc->ifmt_word)
 489                         break;
 490
 491         return desc;
 492 }
 493
 494 static struct ifmedia_type_to_subtype *get_toptype_ttos(int ifmw)
 495 {
 496         struct ifmedia_description *desc;
 497         struct ifmedia_type_to_subtype *ttos;
 498
 499         for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
 500             desc->ifmt_string != NULL; desc++, ttos++)
 501                 if (IFM_TYPE(ifmw) == desc->ifmt_word)
 502                         break;
 503
 504         return ttos;
 505 }
 506
 507 static struct ifmedia_description *get_subtype_desc(int ifmw,
 508     struct ifmedia_type_to_subtype *ttos)
 509 {
 510         int i;
 511         struct ifmedia_description *desc;
 512
 513         for (i = 0; ttos->subtypes[i].desc != NULL; i++) {
 514                 if (ttos->subtypes[i].alias)
 515                         continue;
 516                 for (desc = ttos->subtypes[i].desc;
 517                     desc->ifmt_string != NULL; desc++) {
 518                         if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
 519                                 return desc;
 520                 }
 521         }
 522
 523         return NULL;
 524 }
 525
 526 static void
 527 print_media_word(int ifmw, int print_toptype)
 528 {
 529         struct ifmedia_description *desc;
 530         struct ifmedia_type_to_subtype *ttos;
 531         int seen_option = 0, i;
 532
 533         /* Find the top-level interface type. */
 534         desc = get_toptype_desc(ifmw);
 535         ttos = get_toptype_ttos(ifmw);
 536         if (desc->ifmt_string == NULL) {
 537                 printf("<unknown type>");
 538                 return;
 539         } else if (print_toptype) {
 540                 printf("%s", desc->ifmt_string);
 541         }
 542
 543         /*
 544          * Don't print the top-level type; it's not like we can
 545          * change it, or anything.
 546          */
 547
 548         /* Find subtype. */
 549         desc = get_subtype_desc(ifmw, ttos);
 550         if (desc != NULL)
 551                 goto got_subtype;
 552
 553         /* Falling to here means unknown subtype. */
 554         printf("<unknown subtype>");
 555         return;
 556
 557  got_subtype:
 558         if (print_toptype)
 559                 putchar(' ');
 560
 561         printf("%s", desc->ifmt_string);
 562
 563         /* Find options. */
 564         for (i = 0; ttos->options[i].desc != NULL; i++) {
 565                 if (ttos->options[i].alias)
 566                         continue;
 567                 for (desc = ttos->options[i].desc;
 568                     desc->ifmt_string != NULL; desc++) {
 569                         if (ifmw & desc->ifmt_word) {
 570                                 if (seen_option == 0)
 571                                         printf(" <");
 572                                 printf("%s%s", seen_option++ ? "," : "",
 573                                     desc->ifmt_string);
 574                         }
 575                 }
 576         }
 577         printf("%s", seen_option ? ">" : "");
 578 }
 579
 580 static void
 581 print_media_word_ifconfig(int ifmw)
 582 {
 583         struct ifmedia_description *desc;
 584         struct ifmedia_type_to_subtype *ttos;
 585         int i;
 586
 587         /* Find the top-level interface type. */
 588         desc = get_toptype_desc(ifmw);
 589         ttos = get_toptype_ttos(ifmw);
 590         if (desc->ifmt_string == NULL) {
 591                 printf("<unknown type>");
 592                 return;
 593         }
 594
 595         /*
 596          * Don't print the top-level type; it's not like we can
 597          * change it, or anything.
 598          */
 599
 600         /* Find subtype. */
 601         desc = get_subtype_desc(ifmw, ttos);
 602         if (desc != NULL)
 603                 goto got_subtype;
 604
 605         /* Falling to here means unknown subtype. */
 606         printf("<unknown subtype>");
 607         return;
 608
 609  got_subtype:
 610         printf("media %s", desc->ifmt_string);
 611
 612         /* Find options. */
 613         for (i = 0; ttos->options[i].desc != NULL; i++) {
 614                 if (ttos->options[i].alias)
 615                         continue;
 616                 for (desc = ttos->options[i].desc;
 617                     desc->ifmt_string != NULL; desc++) {
 618                         if (ifmw & desc->ifmt_word) {
 619                                 printf(" mediaopt %s", desc->ifmt_string);
 620                         }
 621                 }
 622         }
 623 }
 624
 625 /**********************************************************************
 626  * ...until here.
 627  **********************************************************************/