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[] _U_ =
  25     "@(#) $Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.80 2005-05-06 04:19:25 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 static const struct tok bootp_flag_values[] = {
  49     { 0x8000,                   "Broadcast" },
  50     { 0, NULL}
  51 };
  52
  53 static const struct tok bootp_op_values[] = {
  54     { BOOTPREQUEST,             "Request" },
  55     { BOOTPREPLY,               "Reply" },
  56     { 0, NULL}
  57 };
  58
  59 /*
  60  * Print bootp requests
  61  */
  62 void
  63 bootp_print(register const u_char *cp, u_int length)
  64 {
  65         register const struct bootp *bp;
  66         static const u_char vm_cmu[4] = VM_CMU;
  67         static const u_char vm_rfc1048[4] = VM_RFC1048;
  68
  69         bp = (const struct bootp *)cp;
  70         TCHECK(bp->bp_op);
  71
  72         printf("BOOTP/DHCP, %s",
  73                tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op));
  74
  75         if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
  76                 TCHECK2(bp->bp_chaddr[0], 6);
  77                 printf(" from %s", etheraddr_string(bp->bp_chaddr));
  78         }
  79
  80         printf(", length: %u", length);
  81
  82         if (!vflag)
  83             return;
  84
  85         TCHECK(bp->bp_secs);
  86
  87         /* The usual hardware address type is 1 (10Mb Ethernet) */
  88         if (bp->bp_htype != 1)
  89                 printf(", htype-#%d", bp->bp_htype);
  90
  91         /* The usual length for 10Mb Ethernet address is 6 bytes */
  92         if (bp->bp_htype != 1 || bp->bp_hlen != 6)
  93                 printf(", hlen:%d", bp->bp_hlen);
  94
  95         /* Only print interesting fields */
  96         if (bp->bp_hops)
  97                 printf(", hops:%d", bp->bp_hops);
  98         if (bp->bp_xid)
  99                 printf(", xid:0x%x", EXTRACT_32BITS(&bp->bp_xid));
 100         if (bp->bp_secs)
 101                 printf(", secs:%d", EXTRACT_16BITS(&bp->bp_secs));
 102
 103         printf(", flags: [%s]",
 104                bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags)));
 105         if (vflag>1)
 106           printf( " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags));
 107
 108         /* Client's ip address */
 109         TCHECK(bp->bp_ciaddr);
 110         if (bp->bp_ciaddr.s_addr)
 111                 printf("\n\t  Client IP: %s", ipaddr_string(&bp->bp_ciaddr));
 112
 113         /* 'your' ip address (bootp client) */
 114         TCHECK(bp->bp_yiaddr);
 115         if (bp->bp_yiaddr.s_addr)
 116                 printf("\n\t  Your IP: %s", ipaddr_string(&bp->bp_yiaddr));
 117
 118         /* Server's ip address */
 119         TCHECK(bp->bp_siaddr);
 120         if (bp->bp_siaddr.s_addr)
 121                 printf("\n\t  Server IP: %s", ipaddr_string(&bp->bp_siaddr));
 122
 123         /* Gateway's ip address */
 124         TCHECK(bp->bp_giaddr);
 125         if (bp->bp_giaddr.s_addr)
 126                 printf("\n\t  Gateway IP: %s", ipaddr_string(&bp->bp_giaddr));
 127
 128         /* Client's Ethernet address */
 129         if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
 130                 TCHECK2(bp->bp_chaddr[0], 6);
 131                 printf("\n\t  Client Ethernet Address: %s", etheraddr_string(bp->bp_chaddr));
 132         }
 133
 134         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 135         if (*bp->bp_sname) {
 136                 printf("\n\t  sname \"");
 137                 if (fn_print(bp->bp_sname, snapend)) {
 138                         putchar('"');
 139                         fputs(tstr + 1, stdout);
 140                         return;
 141                 }
 142                 putchar('"');
 143         }
 144         TCHECK2(bp->bp_file[0], 1);             /* check first char only */
 145         if (*bp->bp_file) {
 146                 printf("\n\t  file \"");
 147                 if (fn_print(bp->bp_file, snapend)) {
 148                         putchar('"');
 149                         fputs(tstr + 1, stdout);
 150                         return;
 151                 }
 152                 putchar('"');
 153         }
 154
 155         /* Decode the vendor buffer */
 156         TCHECK(bp->bp_vend[0]);
 157         if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
 158                  sizeof(u_int32_t)) == 0)
 159                 rfc1048_print(bp->bp_vend);
 160         else if (memcmp((const char *)bp->bp_vend, vm_cmu,
 161                       sizeof(u_int32_t)) == 0)
 162                 cmu_print(bp->bp_vend);
 163         else {
 164                 u_int32_t ul;
 165
 166                 ul = EXTRACT_32BITS(&bp->bp_vend);
 167                 if (ul != 0)
 168                         printf("\n\t  Vendor-#0x%x", ul);
 169         }
 170
 171         return;
 172 trunc:
 173         fputs(tstr, stdout);
 174 }
 175
 176 /*
 177  * The first character specifies the format to print:
 178  *     i - ip address (32 bits)
 179  *     p - ip address pairs (32 bits + 32 bits)
 180  *     l - long (32 bits)
 181  *     L - unsigned long (32 bits)
 182  *     s - short (16 bits)
 183  *     b - period-seperated decimal bytes (variable length)
 184  *     x - colon-seperated hex bytes (variable length)
 185  *     a - ascii string (variable length)
 186  *     B - on/off (8 bits)
 187  *     $ - special (explicit code to handle)
 188  */
 189 static struct tok tag2str[] = {
 190 /* RFC1048 tags */
 191         { TAG_PAD,              " PAD" },
 192         { TAG_SUBNET_MASK,      "iSM" },        /* subnet mask (RFC950) */
 193         { TAG_TIME_OFFSET,      "LTZ" },        /* seconds from UTC */
 194         { TAG_GATEWAY,          "iDG" },        /* default gateway */
 195         { TAG_TIME_SERVER,      "iTS" },        /* time servers (RFC868) */
 196         { TAG_NAME_SERVER,      "iIEN" },       /* IEN name servers (IEN116) */
 197         { TAG_DOMAIN_SERVER,    "iNS" },        /* domain name (RFC1035) */
 198         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 199         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 200         { TAG_LPR_SERVER,       "iLPR" },       /* lpr server (RFC1179) */
 201         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 202         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 203         { TAG_HOSTNAME,         "aHN" },        /* ascii hostname */
 204         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 205         { TAG_END,              " END" },
 206 /* RFC1497 tags */
 207         { TAG_DUMPPATH,         "aDP" },
 208         { TAG_DOMAINNAME,       "aDN" },
 209         { TAG_SWAP_SERVER,      "iSS" },
 210         { TAG_ROOTPATH,         "aRP" },
 211         { TAG_EXTPATH,          "aEP" },
 212 /* RFC2132 tags */
 213         { TAG_IP_FORWARD,       "BIPF" },
 214         { TAG_NL_SRCRT,         "BSRT" },
 215         { TAG_PFILTERS,         "pPF" },
 216         { TAG_REASS_SIZE,       "sRSZ" },
 217         { TAG_DEF_TTL,          "bTTL" },
 218         { TAG_MTU_TIMEOUT,      "lMA" },
 219         { TAG_MTU_TABLE,        "sMT" },
 220         { TAG_INT_MTU,          "sMTU" },
 221         { TAG_LOCAL_SUBNETS,    "BLSN" },
 222         { TAG_BROAD_ADDR,       "iBR" },
 223         { TAG_DO_MASK_DISC,     "BMD" },
 224         { TAG_SUPPLY_MASK,      "BMS" },
 225         { TAG_DO_RDISC,         "BRD" },
 226         { TAG_RTR_SOL_ADDR,     "iRSA" },
 227         { TAG_STATIC_ROUTE,     "pSR" },
 228         { TAG_USE_TRAILERS,     "BUT" },
 229         { TAG_ARP_TIMEOUT,      "lAT" },
 230         { TAG_ETH_ENCAP,        "BIE" },
 231         { TAG_TCP_TTL,          "bTT" },
 232         { TAG_TCP_KEEPALIVE,    "lKI" },
 233         { TAG_KEEPALIVE_GO,     "BKG" },
 234         { TAG_NIS_DOMAIN,       "aYD" },
 235         { TAG_NIS_SERVERS,      "iYS" },
 236         { TAG_NTP_SERVERS,      "iNTP" },
 237         { TAG_VENDOR_OPTS,      "bVO" },
 238         { TAG_NETBIOS_NS,       "iWNS" },
 239         { TAG_NETBIOS_DDS,      "iWDD" },
 240         { TAG_NETBIOS_NODE,     "$WNT" },
 241         { TAG_NETBIOS_SCOPE,    "aWSC" },
 242         { TAG_XWIN_FS,          "iXFS" },
 243         { TAG_XWIN_DM,          "iXDM" },
 244         { TAG_NIS_P_DOMAIN,     "sN+D" },
 245         { TAG_NIS_P_SERVERS,    "iN+S" },
 246         { TAG_MOBILE_HOME,      "iMH" },
 247         { TAG_SMPT_SERVER,      "iSMTP" },
 248         { TAG_POP3_SERVER,      "iPOP3" },
 249         { TAG_NNTP_SERVER,      "iNNTP" },
 250         { TAG_WWW_SERVER,       "iWWW" },
 251         { TAG_FINGER_SERVER,    "iFG" },
 252         { TAG_IRC_SERVER,       "iIRC" },
 253         { TAG_STREETTALK_SRVR,  "iSTS" },
 254         { TAG_STREETTALK_STDA,  "iSTDA" },
 255         { TAG_REQUESTED_IP,     "iRQ" },
 256         { TAG_IP_LEASE,         "lLT" },
 257         { TAG_OPT_OVERLOAD,     "$OO" },
 258         { TAG_TFTP_SERVER,      "aTFTP" },
 259         { TAG_BOOTFILENAME,     "aBF" },
 260         { TAG_DHCP_MESSAGE,     " DHCP" },
 261         { TAG_SERVER_ID,        "iSID" },
 262         { TAG_PARM_REQUEST,     "bPR" },
 263         { TAG_MESSAGE,          "aMSG" },
 264         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 265         { TAG_RENEWAL_TIME,     "lRN" },
 266         { TAG_REBIND_TIME,      "lRB" },
 267         { TAG_VENDOR_CLASS,     "aVC" },
 268         { TAG_CLIENT_ID,        "$CID" },
 269 /* RFC 2485 */
 270         { TAG_OPEN_GROUP_UAP,   "aUAP" },
 271 /* RFC 2563 */
 272         { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
 273 /* RFC 2610 */
 274         { TAG_SLP_DA,           "bSLP-DA" },    /*"b" is a little wrong */
 275         { TAG_SLP_SCOPE,        "bSLP-SCOPE" }, /*"b" is a little wrong */
 276 /* RFC 2937 */
 277         { TAG_NS_SEARCH,        "sNSSEARCH" },  /* XXX 's' */
 278 /* RFC 3011 */
 279         { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
 280 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
 281         { TAG_USER_CLASS,       "aCLASS" },
 282         { TAG_SLP_NAMING_AUTH,  "aSLP-NA" },
 283         { TAG_CLIENT_FQDN,      "$FQDN" },
 284         { TAG_AGENT_CIRCUIT,    "bACKT" },
 285         { TAG_AGENT_REMOTE,     "bARMT" },
 286         { TAG_AGENT_MASK,       "bAMSK" },
 287         { TAG_TZ_STRING,        "aTZSTR" },
 288         { TAG_FQDN_OPTION,      "bFQDNS" },     /* XXX 'b' */
 289         { TAG_AUTH,             "bAUTH" },      /* XXX 'b' */
 290         { TAG_VINES_SERVERS,    "iVINES" },
 291         { TAG_SERVER_RANK,      "sRANK" },
 292         { TAG_CLIENT_ARCH,      "sARCH" },
 293         { TAG_CLIENT_NDI,       "bNDI" },       /* XXX 'b' */
 294         { TAG_CLIENT_GUID,      "bGUID" },      /* XXX 'b' */
 295         { TAG_LDAP_URL,         "aLDAP" },
 296         { TAG_6OVER4,           "i6o4" },
 297         { TAG_PRINTER_NAME,     "aPRTR" },
 298         { TAG_MDHCP_SERVER,     "bMDHCP" },     /* XXX 'b' */
 299         { TAG_IPX_COMPAT,       "bIPX" },       /* XXX 'b' */
 300         { TAG_NETINFO_PARENT,   "iNI" },
 301         { TAG_NETINFO_PARENT_TAG, "aNITAG" },
 302         { TAG_URL,              "aURL" },
 303         { TAG_FAILOVER,         "bFAIL" },      /* XXX 'b' */
 304         { 0,                    NULL }
 305 };
 306 /* 2-byte extended tags */
 307 static struct tok xtag2str[] = {
 308         { 0,                    NULL }
 309 };
 310
 311 /* DHCP "options overload" types */
 312 static struct tok oo2str[] = {
 313         { 1,                    "file" },
 314         { 2,                    "sname" },
 315         { 3,                    "file+sname" },
 316         { 0,                    NULL }
 317 };
 318
 319 /* NETBIOS over TCP/IP node type options */
 320 static struct tok nbo2str[] = {
 321         { 0x1,                  "b-node" },
 322         { 0x2,                  "p-node" },
 323         { 0x4,                  "m-node" },
 324         { 0x8,                  "h-node" },
 325         { 0,                    NULL }
 326 };
 327
 328 /* ARP Hardware types, for Client-ID option */
 329 static struct tok arp2str[] = {
 330         { 0x1,                  "ether" },
 331         { 0x6,                  "ieee802" },
 332         { 0x7,                  "arcnet" },
 333         { 0xf,                  "frelay" },
 334         { 0x17,                 "strip" },
 335         { 0x18,                 "ieee1394" },
 336         { 0,                    NULL }
 337 };
 338
 339 static void
 340 rfc1048_print(register const u_char *bp)
 341 {
 342         register u_int16_t tag;
 343         register u_int len, size;
 344         register const char *cp;
 345         register char c;
 346         int first;
 347         u_int32_t ul;
 348         u_int16_t us;
 349         u_int8_t uc;
 350
 351         printf("\n\t  Vendor-rfc1048:");
 352
 353         /* Step over magic cookie */
 354         bp += sizeof(int32_t);
 355
 356         /* Loop while we there is a tag left in the buffer */
 357         while (bp + 1 < snapend) {
 358                 tag = *bp++;
 359                 if (tag == TAG_PAD)
 360                         continue;
 361                 if (tag == TAG_END)
 362                         return;
 363                 if (tag == TAG_EXTENDED_OPTION) {
 364                         TCHECK2(*(bp + 1), 2);
 365                         tag = EXTRACT_16BITS(bp + 1);
 366                         /* XXX we don't know yet if the IANA will
 367                          * preclude overlap of 1-byte and 2-byte spaces.
 368                          * If not, we need to offset tag after this step.
 369                          */
 370                         cp = tok2str(xtag2str, "?xT%u", tag);
 371                 } else
 372                         cp = tok2str(tag2str, "?T%u", tag);
 373                 c = *cp++;
 374                 printf("\n\t    %s:", cp);
 375
 376                 /* Get the length; check for truncation */
 377                 if (bp + 1 >= snapend) {
 378                         fputs(tstr, stdout);
 379                         return;
 380                 }
 381                 len = *bp++;
 382                 if (bp + len >= snapend) {
 383                         printf("[|bootp %u]", len);
 384                         return;
 385                 }
 386
 387                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 388                         uc = *bp++;
 389                         switch (uc) {
 390                         case DHCPDISCOVER:      printf("DISCOVER");     break;
 391                         case DHCPOFFER:         printf("OFFER");        break;
 392                         case DHCPREQUEST:       printf("REQUEST");      break;
 393                         case DHCPDECLINE:       printf("DECLINE");      break;
 394                         case DHCPACK:           printf("ACK");          break;
 395                         case DHCPNAK:           printf("NACK");         break;
 396                         case DHCPRELEASE:       printf("RELEASE");      break;
 397                         case DHCPINFORM:        printf("INFORM");       break;
 398                         default:                printf("%u", uc);       break;
 399                         }
 400                         continue;
 401                 }
 402
 403                 if (tag == TAG_PARM_REQUEST) {
 404                         first = 1;
 405                         while (len-- > 0) {
 406                                 uc = *bp++;
 407                                 cp = tok2str(tag2str, "?T%u", uc);
 408                                 if (!first)
 409                                         putchar('+');
 410                                 printf("%s", cp + 1);
 411                                 first = 0;
 412                         }
 413                         continue;
 414                 }
 415                 if (tag == TAG_EXTENDED_REQUEST) {
 416                         first = 1;
 417                         while (len > 1) {
 418                                 len -= 2;
 419                                 us = EXTRACT_16BITS(bp);
 420                                 bp += 2;
 421                                 cp = tok2str(xtag2str, "?xT%u", us);
 422                                 if (!first)
 423                                         putchar('+');
 424                                 printf("%s", cp + 1);
 425                                 first = 0;
 426                         }
 427                         continue;
 428                 }
 429
 430                 /* Print data */
 431                 size = len;
 432                 if (c == '?') {
 433                         /* Base default formats for unknown tags on data size */
 434                         if (size & 1)
 435                                 c = 'b';
 436                         else if (size & 2)
 437                                 c = 's';
 438                         else
 439                                 c = 'l';
 440                 }
 441                 first = 1;
 442                 switch (c) {
 443
 444                 case 'a':
 445                         /* ascii strings */
 446                         putchar('"');
 447                         if (fn_printn(bp, size, snapend)) {
 448                                 putchar('"');
 449                                 goto trunc;
 450                         }
 451                         putchar('"');
 452                         bp += size;
 453                         size = 0;
 454                         break;
 455
 456                 case 'i':
 457                 case 'l':
 458                 case 'L':
 459                         /* ip addresses/32-bit words */
 460                         while (size >= sizeof(ul)) {
 461                                 if (!first)
 462                                         putchar(',');
 463                                 ul = EXTRACT_32BITS(bp);
 464                                 if (c == 'i') {
 465                                         ul = htonl(ul);
 466                                         printf("%s", ipaddr_string(&ul));
 467                                 } else if (c == 'L')
 468                                         printf("%d", ul);
 469                                 else
 470                                         printf("%u", ul);
 471                                 bp += sizeof(ul);
 472                                 size -= sizeof(ul);
 473                                 first = 0;
 474                         }
 475                         break;
 476
 477                 case 'p':
 478                         /* IP address pairs */
 479                         while (size >= 2*sizeof(ul)) {
 480                                 if (!first)
 481                                         putchar(',');
 482                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 483                                 printf("(%s:", ipaddr_string(&ul));
 484                                 bp += sizeof(ul);
 485                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 486                                 printf("%s)", ipaddr_string(&ul));
 487                                 bp += sizeof(ul);
 488                                 size -= 2*sizeof(ul);
 489                                 first = 0;
 490                         }
 491                         break;
 492
 493                 case 's':
 494                         /* shorts */
 495                         while (size >= sizeof(us)) {
 496                                 if (!first)
 497                                         putchar(',');
 498                                 us = EXTRACT_16BITS(bp);
 499                                 printf("%u", us);
 500                                 bp += sizeof(us);
 501                                 size -= sizeof(us);
 502                                 first = 0;
 503                         }
 504                         break;
 505
 506                 case 'B':
 507                         /* boolean */
 508                         while (size > 0) {
 509                                 if (!first)
 510                                         putchar(',');
 511                                 switch (*bp) {
 512                                 case 0:
 513                                         putchar('N');
 514                                         break;
 515                                 case 1:
 516                                         putchar('Y');
 517                                         break;
 518                                 default:
 519                                         printf("%u?", *bp);
 520                                         break;
 521                                 }
 522                                 ++bp;
 523                                 --size;
 524                                 first = 0;
 525                         }
 526                         break;
 527
 528                 case 'b':
 529                 case 'x':
 530                 default:
 531                         /* Bytes */
 532                         while (size > 0) {
 533                                 if (!first)
 534                                         putchar(c == 'x' ? ':' : '.');
 535                                 if (c == 'x')
 536                                         printf("%02x", *bp);
 537                                 else
 538                                         printf("%u", *bp);
 539                                 ++bp;
 540                                 --size;
 541                                 first = 0;
 542                         }
 543                         break;
 544
 545                 case '$':
 546                         /* Guys we can't handle with one of the usual cases */
 547                         switch (tag) {
 548
 549                         case TAG_NETBIOS_NODE:
 550                                 tag = *bp++;
 551                                 --size;
 552                                 fputs(tok2str(nbo2str, NULL, tag), stdout);
 553                                 break;
 554
 555                         case TAG_OPT_OVERLOAD:
 556                                 tag = *bp++;
 557                                 --size;
 558                                 fputs(tok2str(oo2str, NULL, tag), stdout);
 559                                 break;
 560
 561                         case TAG_CLIENT_FQDN:
 562                                 /* option 81 should be at least 4 bytes long */
 563                                 if (len < 4)  {
 564                                         printf("ERROR: options 81 len %u < 4 bytes", len);
 565                                         break;
 566                                 }
 567                                 if (*bp++)
 568                                         printf("[svrreg]");
 569                                 if (*bp)
 570                                         printf("%u/%u/", *bp, *(bp+1));
 571                                 bp += 2;
 572                                 putchar('"');
 573                                 if (fn_printn(bp, size - 3, snapend)) {
 574                                         putchar('"');
 575                                         goto trunc;
 576                                 }
 577                                 putchar('"');
 578                                 bp += size - 3;
 579                                 size = 0;
 580                                 break;
 581
 582                         case TAG_CLIENT_ID:
 583                             {   int type = *bp++;
 584                                 size--;
 585                                 if (type == 0) {
 586                                         putchar('"');
 587                                         if (fn_printn(bp, size, snapend)) {
 588                                                 putchar('"');
 589                                                 goto trunc;
 590                                         }
 591                                         putchar('"');
 592                                         bp += size;
 593                                         size = 0;
 594                                         break;
 595                                 } else {
 596                                         printf("[%s]", tok2str(arp2str, "type-%d", type));
 597                                 }
 598                                 while (size > 0) {
 599                                         if (!first)
 600                                                 putchar(':');
 601                                         printf("%02x", *bp);
 602                                         ++bp;
 603                                         --size;
 604                                         first = 0;
 605                                 }
 606                                 break;
 607                             }
 608
 609                         default:
 610                                 printf("[unknown special tag %u, size %u]",
 611                                     tag, size);
 612                                 bp += size;
 613                                 size = 0;
 614                                 break;
 615                         }
 616                         break;
 617                 }
 618                 /* Data left over? */
 619                 if (size) {
 620                         printf("[len %u]", len);
 621                         bp += size;
 622                 }
 623         }
 624         return;
 625 trunc:
 626         printf("|[rfc1048]");
 627 }
 628
 629 static void
 630 cmu_print(register const u_char *bp)
 631 {
 632         register const struct cmu_vend *cmu;
 633
 634 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
 635     if (cmu->m.s_addr != 0) \
 636         printf(" %s:%s", s, ipaddr_string(&cmu->m.s_addr)); }
 637
 638         printf(" vend-cmu");
 639         cmu = (const struct cmu_vend *)bp;
 640
 641         /* Only print if there are unknown bits */
 642         TCHECK(cmu->v_flags);
 643         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
 644                 printf(" F:0x%x", cmu->v_flags);
 645         PRINTCMUADDR(v_dgate, "DG");
 646         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
 647         PRINTCMUADDR(v_dns1, "NS1");
 648         PRINTCMUADDR(v_dns2, "NS2");
 649         PRINTCMUADDR(v_ins1, "IEN1");
 650         PRINTCMUADDR(v_ins2, "IEN2");
 651         PRINTCMUADDR(v_ts1, "TS1");
 652         PRINTCMUADDR(v_ts2, "TS2");
 653         return;
 654
 655 trunc:
 656         fputs(tstr, stdout);
 657 #undef PRINTCMUADDR
 658 }