The Tcpdump Group git mirrors - tcpdump/blob - print-bootp.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Format and print bootp packets.
  22  */
  23 #ifndef lint
  24 static const char rcsid[] =
  25     "@(#) $Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.69 2002-12-18 08:53:20 guy Exp $ (LBL)";
  26 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <tcpdump-stdinc.h>
  33
  34 #include <stdio.h>
  35 #include <string.h>
  36
  37 #include "interface.h"
  38 #include "addrtoname.h"
  39 #include "extract.h"
  40 #include "ether.h"
  41 #include "bootp.h"
  42
  43 static void rfc1048_print(const u_char *);
  44 static void cmu_print(const u_char *);
  45
  46 static char tstr[] = " [|bootp]";
  47
  48 /*
  49  * Print bootp requests
  50  */
  51 void
  52 bootp_print(register const u_char *cp, u_short sport, u_short dport, u_int length)
  53 {
  54         register const struct bootp *bp;
  55         static const u_char vm_cmu[4] = VM_CMU;
  56         static const u_char vm_rfc1048[4] = VM_RFC1048;
  57
  58         printf("BOOTP/DHCP, length: %u",length);
  59
  60         if (!vflag)
  61             return;
  62
  63         bp = (const struct bootp *)cp;
  64         TCHECK(bp->bp_op);
  65         switch (bp->bp_op) {
  66
  67         case BOOTREQUEST:
  68                 /* Usually, a request goes from a client to a server */
  69                 if (sport == IPPORT_BOOTPC && dport == IPPORT_BOOTPS)
  70                         printf("\n\tRequest");
  71                 break;
  72
  73         case BOOTREPLY:
  74                 /* Usually, a reply goes from a server to a client */
  75                 if (sport == IPPORT_BOOTPS && dport == IPPORT_BOOTPC)
  76                         printf("\n\tReply");
  77                 break;
  78
  79         default:
  80                 printf("\n\tbootp-#%d", bp->bp_op);
  81                 break;
  82         }
  83
  84         TCHECK(bp->bp_secs);
  85
  86         /* The usual hardware address type is 1 (10Mb Ethernet) */
  87         if (bp->bp_htype != 1)
  88                 printf(", htype-#%d", bp->bp_htype);
  89
  90         /* The usual length for 10Mb Ethernet address is 6 bytes */
  91         if (bp->bp_htype != 1 || bp->bp_hlen != 6)
  92                 printf(", hlen:%d", bp->bp_hlen);
  93
  94         /* Only print interesting fields */
  95         if (bp->bp_hops)
  96                 printf(", hops:%d", bp->bp_hops);
  97         if (bp->bp_xid)
  98                 printf(", xid:0x%x", EXTRACT_32BITS(&bp->bp_xid));
  99         if (bp->bp_secs)
 100                 printf(", secs:%d", EXTRACT_16BITS(&bp->bp_secs));
 101         if (bp->bp_flags)
 102                 printf(", flags:0x%x", EXTRACT_16BITS(&bp->bp_flags));
 103
 104         /* Client's ip address */
 105         TCHECK(bp->bp_ciaddr);
 106         if (bp->bp_ciaddr.s_addr)
 107                 printf("\n\t  Client IP: %s", ipaddr_string(&bp->bp_ciaddr));
 108
 109         /* 'your' ip address (bootp client) */
 110         TCHECK(bp->bp_yiaddr);
 111         if (bp->bp_yiaddr.s_addr)
 112                 printf("\n\t  Your IP: %s", ipaddr_string(&bp->bp_yiaddr));
 113
 114         /* Server's ip address */
 115         TCHECK(bp->bp_siaddr);
 116         if (bp->bp_siaddr.s_addr)
 117                 printf("\n\t  Server IP: %s", ipaddr_string(&bp->bp_siaddr));
 118
 119         /* Gateway's ip address */
 120         TCHECK(bp->bp_giaddr);
 121         if (bp->bp_giaddr.s_addr)
 122                 printf("\n\t  Gateway IP: %s", ipaddr_string(&bp->bp_giaddr));
 123
 124         /* Client's Ethernet address */
 125         if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
 126                 TCHECK2(bp->bp_chaddr[0], 6);
 127                 printf("\n\t  Client Ethernet Address: %s", etheraddr_string(bp->bp_chaddr));
 128         }
 129
 130         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 131         if (*bp->bp_sname) {
 132                 printf("\n\t  sname \"");
 133                 if (fn_print(bp->bp_sname, snapend)) {
 134                         putchar('"');
 135                         fputs(tstr + 1, stdout);
 136                         return;
 137                 }
 138                 putchar('"');
 139         }
 140         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 141         if (*bp->bp_file) {
 142                 printf("\n\t  file \"");
 143                 if (fn_print(bp->bp_file, snapend)) {
 144                         putchar('"');
 145                         fputs(tstr + 1, stdout);
 146                         return;
 147                 }
 148                 putchar('"');
 149         }
 150
 151         /* Decode the vendor buffer */
 152         TCHECK(bp->bp_vend[0]);
 153         if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
 154                  sizeof(u_int32_t)) == 0)
 155                 rfc1048_print(bp->bp_vend);
 156         else if (memcmp((const char *)bp->bp_vend, vm_cmu,
 157                       sizeof(u_int32_t)) == 0)
 158                 cmu_print(bp->bp_vend);
 159         else {
 160                 u_int32_t ul;
 161
 162                 ul = EXTRACT_32BITS(&bp->bp_vend);
 163                 if (ul != 0)
 164                         printf("\n\t  Vendor-#0x%x", ul);
 165         }
 166
 167         return;
 168 trunc:
 169         fputs(tstr, stdout);
 170 }
 171
 172 /*
 173  * The first character specifies the format to print:
 174  *     i - ip address (32 bits)
 175  *     p - ip address pairs (32 bits + 32 bits)
 176  *     l - long (32 bits)
 177  *     L - unsigned long (32 bits)
 178  *     s - short (16 bits)
 179  *     b - period-seperated decimal bytes (variable length)
 180  *     x - colon-seperated hex bytes (variable length)
 181  *     a - ascii string (variable length)
 182  *     B - on/off (8 bits)
 183  *     $ - special (explicit code to handle)
 184  */
 185 static struct tok tag2str[] = {
 186 /* RFC1048 tags */
 187         { TAG_PAD,              " PAD" },
 188         { TAG_SUBNET_MASK,      "iSM" },        /* subnet mask (RFC950) */
 189         { TAG_TIME_OFFSET,      "LTZ" },        /* seconds from UTC */
 190         { TAG_GATEWAY,          "iDG" },        /* default gateway */
 191         { TAG_TIME_SERVER,      "iTS" },        /* time servers (RFC868) */
 192         { TAG_NAME_SERVER,      "iIEN" },       /* IEN name servers (IEN116) */
 193         { TAG_DOMAIN_SERVER,    "iNS" },        /* domain name (RFC1035) */
 194         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 195         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 196         { TAG_LPR_SERVER,       "iLPR" },       /* lpr server (RFC1179) */
 197         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 198         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 199         { TAG_HOSTNAME,         "aHN" },        /* ascii hostname */
 200         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 201         { TAG_END,              " END" },
 202 /* RFC1497 tags */
 203         { TAG_DUMPPATH,         "aDP" },
 204         { TAG_DOMAINNAME,       "aDN" },
 205         { TAG_SWAP_SERVER,      "iSS" },
 206         { TAG_ROOTPATH,         "aRP" },
 207         { TAG_EXTPATH,          "aEP" },
 208 /* RFC2132 tags */
 209         { TAG_IP_FORWARD,       "BIPF" },
 210         { TAG_NL_SRCRT,         "BSRT" },
 211         { TAG_PFILTERS,         "pPF" },
 212         { TAG_REASS_SIZE,       "sRSZ" },
 213         { TAG_DEF_TTL,          "bTTL" },
 214         { TAG_MTU_TIMEOUT,      "lMA" },
 215         { TAG_MTU_TABLE,        "sMT" },
 216         { TAG_INT_MTU,          "sMTU" },
 217         { TAG_LOCAL_SUBNETS,    "BLSN" },
 218         { TAG_BROAD_ADDR,       "iBR" },
 219         { TAG_DO_MASK_DISC,     "BMD" },
 220         { TAG_SUPPLY_MASK,      "BMS" },
 221         { TAG_DO_RDISC,         "BRD" },
 222         { TAG_RTR_SOL_ADDR,     "iRSA" },
 223         { TAG_STATIC_ROUTE,     "pSR" },
 224         { TAG_USE_TRAILERS,     "BUT" },
 225         { TAG_ARP_TIMEOUT,      "lAT" },
 226         { TAG_ETH_ENCAP,        "BIE" },
 227         { TAG_TCP_TTL,          "bTT" },
 228         { TAG_TCP_KEEPALIVE,    "lKI" },
 229         { TAG_KEEPALIVE_GO,     "BKG" },
 230         { TAG_NIS_DOMAIN,       "aYD" },
 231         { TAG_NIS_SERVERS,      "iYS" },
 232         { TAG_NTP_SERVERS,      "iNTP" },
 233         { TAG_VENDOR_OPTS,      "bVO" },
 234         { TAG_NETBIOS_NS,       "iWNS" },
 235         { TAG_NETBIOS_DDS,      "iWDD" },
 236         { TAG_NETBIOS_NODE,     "$WNT" },
 237         { TAG_NETBIOS_SCOPE,    "aWSC" },
 238         { TAG_XWIN_FS,          "iXFS" },
 239         { TAG_XWIN_DM,          "iXDM" },
 240         { TAG_NIS_P_DOMAIN,     "sN+D" },
 241         { TAG_NIS_P_SERVERS,    "iN+S" },
 242         { TAG_MOBILE_HOME,      "iMH" },
 243         { TAG_SMPT_SERVER,      "iSMTP" },
 244         { TAG_POP3_SERVER,      "iPOP3" },
 245         { TAG_NNTP_SERVER,      "iNNTP" },
 246         { TAG_WWW_SERVER,       "iWWW" },
 247         { TAG_FINGER_SERVER,    "iFG" },
 248         { TAG_IRC_SERVER,       "iIRC" },
 249         { TAG_STREETTALK_SRVR,  "iSTS" },
 250         { TAG_STREETTALK_STDA,  "iSTDA" },
 251         { TAG_REQUESTED_IP,     "iRQ" },
 252         { TAG_IP_LEASE,         "lLT" },
 253         { TAG_OPT_OVERLOAD,     "$OO" },
 254         { TAG_TFTP_SERVER,      "aTFTP" },
 255         { TAG_BOOTFILENAME,     "aBF" },
 256         { TAG_DHCP_MESSAGE,     " DHCP" },
 257         { TAG_SERVER_ID,        "iSID" },
 258         { TAG_PARM_REQUEST,     "bPR" },
 259         { TAG_MESSAGE,          "aMSG" },
 260         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 261         { TAG_RENEWAL_TIME,     "lRN" },
 262         { TAG_REBIND_TIME,      "lRB" },
 263         { TAG_VENDOR_CLASS,     "aVC" },
 264         { TAG_CLIENT_ID,        "$CID" },
 265 /* RFC 2485 */
 266         { TAG_OPEN_GROUP_UAP,   "aUAP" },
 267 /* RFC 2563 */
 268         { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
 269 /* RFC 2610 */
 270         { TAG_SLP_DA,           "bSLP-DA" },    /*"b" is a little wrong */
 271         { TAG_SLP_SCOPE,        "bSLP-SCOPE" }, /*"b" is a little wrong */
 272 /* RFC 2937 */
 273         { TAG_NS_SEARCH,        "sNSSEARCH" },  /* XXX 's' */
 274 /* RFC 3011 */
 275         { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
 276 /* ftp://ftp.isi.edu/.../assignments/bootp-dhcp-extensions */
 277         { TAG_USER_CLASS,       "aCLASS" },
 278         { TAG_SLP_NAMING_AUTH,  "aSLP-NA" },
 279         { TAG_CLIENT_FQDN,      "$FQDN" },
 280         { TAG_AGENT_CIRCUIT,    "bACKT" },
 281         { TAG_AGENT_REMOTE,     "bARMT" },
 282         { TAG_AGENT_MASK,       "bAMSK" },
 283         { TAG_TZ_STRING,        "aTZSTR" },
 284         { TAG_FQDN_OPTION,      "bFQDNS" },     /* XXX 'b' */
 285         { TAG_AUTH,             "bAUTH" },      /* XXX 'b' */
 286         { TAG_VINES_SERVERS,    "iVINES" },
 287         { TAG_SERVER_RANK,      "sRANK" },
 288         { TAG_CLIENT_ARCH,      "sARCH" },
 289         { TAG_CLIENT_NDI,       "bNDI" },       /* XXX 'b' */
 290         { TAG_CLIENT_GUID,      "bGUID" },      /* XXX 'b' */
 291         { TAG_LDAP_URL,         "aLDAP" },
 292         { TAG_6OVER4,           "i6o4" },
 293         { TAG_PRINTER_NAME,     "aPRTR" },
 294         { TAG_MDHCP_SERVER,     "bMDHCP" },     /* XXX 'b' */
 295         { TAG_IPX_COMPAT,       "bIPX" },       /* XXX 'b' */
 296         { TAG_NETINFO_PARENT,   "iNI" },
 297         { TAG_NETINFO_PARENT_TAG, "aNITAG" },
 298         { TAG_URL,              "aURL" },
 299         { TAG_FAILOVER,         "bFAIL" },      /* XXX 'b' */
 300         { 0,                    NULL }
 301 };
 302 /* 2-byte extended tags */
 303 static struct tok xtag2str[] = {
 304         { 0,                    NULL }
 305 };
 306
 307 /* DHCP "options overload" types */
 308 static struct tok oo2str[] = {
 309         { 1,                    "file" },
 310         { 2,                    "sname" },
 311         { 3,                    "file+sname" },
 312         { 0,                    NULL }
 313 };
 314
 315 /* NETBIOS over TCP/IP node type options */
 316 static struct tok nbo2str[] = {
 317         { 0x1,                  "b-node" },
 318         { 0x2,                  "p-node" },
 319         { 0x4,                  "m-node" },
 320         { 0x8,                  "h-node" },
 321         { 0,                    NULL }
 322 };
 323
 324 /* ARP Hardware types, for Client-ID option */
 325 static struct tok arp2str[] = {
 326         { 0x1,                  "ether" },
 327         { 0x6,                  "ieee802" },
 328         { 0x7,                  "arcnet" },
 329         { 0xf,                  "frelay" },
 330         { 0x17,                 "strip" },
 331         { 0x18,                 "ieee1394" },
 332         { 0,                    NULL }
 333 };
 334
 335 static void
 336 rfc1048_print(register const u_char *bp)
 337 {
 338         register u_int16_t tag;
 339         register u_int len, size;
 340         register const char *cp;
 341         register char c;
 342         int first;
 343         u_int32_t ul;
 344         u_int16_t us;
 345         u_int8_t uc;
 346
 347         printf("\n\t  Vendor-rfc1048:");
 348
 349         /* Step over magic cookie */
 350         bp += sizeof(int32_t);
 351
 352         /* Loop while we there is a tag left in the buffer */
 353         while (bp + 1 < snapend) {
 354                 tag = *bp++;
 355                 if (tag == TAG_PAD)
 356                         continue;
 357                 if (tag == TAG_END)
 358                         return;
 359                 if (tag == TAG_EXTENDED_OPTION) {
 360                         TCHECK2(*(bp + 1), 2);
 361                         tag = EXTRACT_16BITS(bp + 1);
 362                         /* XXX we don't know yet if the IANA will
 363                          * preclude overlap of 1-byte and 2-byte spaces.
 364                          * If not, we need to offset tag after this step.
 365                          */
 366                         cp = tok2str(xtag2str, "?xT%u", tag);
 367                 } else
 368                         cp = tok2str(tag2str, "?T%u", tag);
 369                 c = *cp++;
 370                 printf("\n\t    %s:", cp);
 371
 372                 /* Get the length; check for truncation */
 373                 if (bp + 1 >= snapend) {
 374                         fputs(tstr, stdout);
 375                         return;
 376                 }
 377                 len = *bp++;
 378                 if (bp + len >= snapend) {
 379                         fputs(tstr, stdout);
 380                         return;
 381                 }
 382
 383                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 384                         uc = *bp++;
 385                         switch (uc) {
 386                         case DHCPDISCOVER:      printf("DISCOVER");     break;
 387                         case DHCPOFFER:         printf("OFFER");        break;
 388                         case DHCPREQUEST:       printf("REQUEST");      break;
 389                         case DHCPDECLINE:       printf("DECLINE");      break;
 390                         case DHCPACK:           printf("ACK");          break;
 391                         case DHCPNAK:           printf("NACK");         break;
 392                         case DHCPRELEASE:       printf("RELEASE");      break;
 393                         case DHCPINFORM:        printf("INFORM");       break;
 394                         default:                printf("%u", uc);       break;
 395                         }
 396                         continue;
 397                 }
 398
 399                 if (tag == TAG_PARM_REQUEST) {
 400                         first = 1;
 401                         while (len-- > 0) {
 402                                 uc = *bp++;
 403                                 cp = tok2str(tag2str, "?T%u", uc);
 404                                 if (!first)
 405                                         putchar('+');
 406                                 printf("%s", cp + 1);
 407                                 first = 0;
 408                         }
 409                         continue;
 410                 }
 411                 if (tag == TAG_EXTENDED_REQUEST) {
 412                         first = 1;
 413                         while (len > 1) {
 414                                 len -= 2;
 415                                 us = EXTRACT_16BITS(bp);
 416                                 bp += 2;
 417                                 cp = tok2str(xtag2str, "?xT%u", us);
 418                                 if (!first)
 419                                         putchar('+');
 420                                 printf("%s", cp + 1);
 421                                 first = 0;
 422                         }
 423                         continue;
 424                 }
 425
 426                 /* Print data */
 427                 size = len;
 428                 if (c == '?') {
 429                         /* Base default formats for unknown tags on data size */
 430                         if (size & 1)
 431                                 c = 'b';
 432                         else if (size & 2)
 433                                 c = 's';
 434                         else
 435                                 c = 'l';
 436                 }
 437                 first = 1;
 438                 switch (c) {
 439
 440                 case 'a':
 441                         /* ascii strings */
 442                         putchar('"');
 443                         (void)fn_printn(bp, size, NULL);
 444                         putchar('"');
 445                         bp += size;
 446                         size = 0;
 447                         break;
 448
 449                 case 'i':
 450                 case 'l':
 451                 case 'L':
 452                         /* ip addresses/32-bit words */
 453                         while (size >= sizeof(ul)) {
 454                                 if (!first)
 455                                         putchar(',');
 456                                 ul = EXTRACT_32BITS(bp);
 457                                 if (c == 'i') {
 458                                         ul = htonl(ul);
 459                                         printf("%s", ipaddr_string(&ul));
 460                                 } else if (c == 'L')
 461                                         printf("%d", ul);
 462                                 else
 463                                         printf("%u", ul);
 464                                 bp += sizeof(ul);
 465                                 size -= sizeof(ul);
 466                                 first = 0;
 467                         }
 468                         break;
 469
 470                 case 'p':
 471                         /* IP address pairs */
 472                         while (size >= 2*sizeof(ul)) {
 473                                 if (!first)
 474                                         putchar(',');
 475                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 476                                 printf("(%s:", ipaddr_string(&ul));
 477                                 bp += sizeof(ul);
 478                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 479                                 printf("%s)", ipaddr_string(&ul));
 480                                 bp += sizeof(ul);
 481                                 size -= 2*sizeof(ul);
 482                                 first = 0;
 483                         }
 484                         break;
 485
 486                 case 's':
 487                         /* shorts */
 488                         while (size >= sizeof(us)) {
 489                                 if (!first)
 490                                         putchar(',');
 491                                 us = EXTRACT_16BITS(bp);
 492                                 printf("%u", us);
 493                                 bp += sizeof(us);
 494                                 size -= sizeof(us);
 495                                 first = 0;
 496                         }
 497                         break;
 498
 499                 case 'B':
 500                         /* boolean */
 501                         while (size > 0) {
 502                                 if (!first)
 503                                         putchar(',');
 504                                 switch (*bp) {
 505                                 case 0:
 506                                         putchar('N');
 507                                         break;
 508                                 case 1:
 509                                         putchar('Y');
 510                                         break;
 511                                 default:
 512                                         printf("%u?", *bp);
 513                                         break;
 514                                 }
 515                                 ++bp;
 516                                 --size;
 517                                 first = 0;
 518                         }
 519                         break;
 520
 521                 case 'b':
 522                 case 'x':
 523                 default:
 524                         /* Bytes */
 525                         while (size > 0) {
 526                                 if (!first)
 527                                         putchar(c == 'x' ? ':' : '.');
 528                                 if (c == 'x')
 529                                         printf("%02x", *bp);
 530                                 else
 531                                         printf("%u", *bp);
 532                                 ++bp;
 533                                 --size;
 534                                 first = 0;
 535                         }
 536                         break;
 537
 538                 case '$':
 539                         /* Guys we can't handle with one of the usual cases */
 540                         switch (tag) {
 541
 542                         case TAG_NETBIOS_NODE:
 543                                 tag = *bp++;
 544                                 --size;
 545                                 fputs(tok2str(nbo2str, NULL, tag), stdout);
 546                                 break;
 547
 548                         case TAG_OPT_OVERLOAD:
 549                                 tag = *bp++;
 550                                 --size;
 551                                 fputs(tok2str(oo2str, NULL, tag), stdout);
 552                                 break;
 553
 554                         case TAG_CLIENT_FQDN:
 555                                 if (*bp++)
 556                                         printf("[svrreg]");
 557                                 if (*bp)
 558                                         printf("%u/%u/", *bp, *(bp+1));
 559                                 bp += 2;
 560                                 putchar('"');
 561                                 (void)fn_printn(bp, size - 3, NULL);
 562                                 putchar('"');
 563                                 bp += size - 3;
 564                                 size = 0;
 565                                 break;
 566
 567                         case TAG_CLIENT_ID:
 568                             {   int type = *bp++;
 569                                 size--;
 570                                 if (type == 0) {
 571                                         putchar('"');
 572                                         (void)fn_printn(bp, size, NULL);
 573                                         putchar('"');
 574                                         break;
 575                                 } else {
 576                                         printf("[%s]", tok2str(arp2str, "type-%d", type));
 577                                 }
 578                                 while (size > 0) {
 579                                         if (!first)
 580                                                 putchar(':');
 581                                         printf("%02x", *bp);
 582                                         ++bp;
 583                                         --size;
 584                                         first = 0;
 585                                 }
 586                                 break;
 587                             }
 588
 589                         default:
 590                                 printf("[unknown special tag %u, size %u]",
 591                                     tag, size);
 592                                 bp += size;
 593                                 size = 0;
 594                                 break;
 595                         }
 596                         break;
 597                 }
 598                 /* Data left over? */
 599                 if (size)
 600                         printf("[len %u]", len);
 601         }
 602         return;
 603 trunc:
 604         printf("|[rfc1048]");
 605 }
 606
 607 static void
 608 cmu_print(register const u_char *bp)
 609 {
 610         register const struct cmu_vend *cmu;
 611
 612 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
 613     if (cmu->m.s_addr != 0) \
 614         printf(" %s:%s", s, ipaddr_string(&cmu->m.s_addr)); }
 615
 616         printf(" vend-cmu");
 617         cmu = (const struct cmu_vend *)bp;
 618
 619         /* Only print if there are unknown bits */
 620         TCHECK(cmu->v_flags);
 621         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
 622                 printf(" F:0x%x", cmu->v_flags);
 623         PRINTCMUADDR(v_dgate, "DG");
 624         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
 625         PRINTCMUADDR(v_dns1, "NS1");
 626         PRINTCMUADDR(v_dns2, "NS2");
 627         PRINTCMUADDR(v_ins1, "IEN1");
 628         PRINTCMUADDR(v_ins2, "IEN2");
 629         PRINTCMUADDR(v_ts1, "TS1");
 630         PRINTCMUADDR(v_ts2, "TS2");
 631         return;
 632
 633 trunc:
 634         fputs(tstr, stdout);
 635 #undef PRINTCMUADDR
 636 }