dist/tcpdump/print-bootp.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that: (1) source code distributions
   9  * retain the above copyright notice and this paragraph in its entirety, (2)
  10  * distributions including binary code include the above copyright notice and
  11  * this paragraph in its entirety in the documentation or other materials
  12  * provided with the distribution, and (3) all advertising materials mentioning
  13  * features or use of this software display the following acknowledgement:
  14  * ``This product includes software developed by the University of California,
  15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  16  * the University nor the names of its contributors may be used to endorse
  17  * or promote products derived from this software without specific prior
  18  * written permission.
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22  *
  23  * Format and print bootp packets.
  24  */
  25 #include <sys/cdefs.h>
  26 #ifndef lint
  27 #if 0
  28 static const char rcsid[] _U_ =
  29     "@(#) Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.78.2.7 2007/01/29 20:56:00 guy Exp (LBL)";
  30 #else
  31 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  32 #endif
  33 #endif
  34
  35 #ifdef HAVE_CONFIG_H
  36 #include "config.h"
  37 #endif
  38
  39 #include <tcpdump-stdinc.h>
  40
  41 #include <stdio.h>
  42 #include <string.h>
  43
  44 #include "interface.h"
  45 #include "addrtoname.h"
  46 #include "extract.h"
  47 #include "ether.h"
  48 #include "bootp.h"
  49
  50 static void rfc1048_print(const u_char *);
  51 static void cmu_print(const u_char *);
  52 static char *client_fqdn_flags(u_int flags);
  53
  54 static char tstr[] = " [|bootp]";
  55
  56 static const struct tok bootp_flag_values[] = {
  57     { 0x8000,                   "Broadcast" },
  58     { 0, NULL}
  59 };
  60
  61 static const struct tok bootp_op_values[] = {
  62     { BOOTPREQUEST,             "Request" },
  63     { BOOTPREPLY,               "Reply" },
  64     { 0, NULL}
  65 };
  66
  67 /*
  68  * Print bootp requests
  69  */
  70 void
  71 bootp_print(register const u_char *cp, u_int length)
  72 {
  73         register const struct bootp *bp;
  74         static const u_char vm_cmu[4] = VM_CMU;
  75         static const u_char vm_rfc1048[4] = VM_RFC1048;
  76
  77         bp = (const struct bootp *)cp;
  78         TCHECK(bp->bp_op);
  79
  80         printf("BOOTP/DHCP, %s",
  81                tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op));
  82
  83         if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
  84                 TCHECK2(bp->bp_chaddr[0], 6);
  85                 printf(" from %s", etheraddr_string(bp->bp_chaddr));
  86         }
  87
  88         printf(", length %u", length);
  89
  90         if (!vflag)
  91             return;
  92
  93         TCHECK(bp->bp_secs);
  94
  95         /* The usual hardware address type is 1 (10Mb Ethernet) */
  96         if (bp->bp_htype != 1)
  97                 printf(", htype %d", bp->bp_htype);
  98
  99         /* The usual length for 10Mb Ethernet address is 6 bytes */
 100         if (bp->bp_htype != 1 || bp->bp_hlen != 6)
 101                 printf(", hlen %d", bp->bp_hlen);
 102
 103         /* Only print interesting fields */
 104         if (bp->bp_hops)
 105                 printf(", hops %d", bp->bp_hops);
 106         if (bp->bp_xid)
 107                 printf(", xid 0x%x", EXTRACT_32BITS(&bp->bp_xid));
 108         if (bp->bp_secs)
 109                 printf(", secs %d", EXTRACT_16BITS(&bp->bp_secs));
 110
 111         printf(", Flags [%s]",
 112                 bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags)));
 113         if (vflag > 1)
 114                 printf(" (0x%04x)", EXTRACT_16BITS(&bp->bp_flags));
 115
 116         /* Client's ip address */
 117         TCHECK(bp->bp_ciaddr);
 118         if (bp->bp_ciaddr.s_addr)
 119                 printf("\n\t  Client-IP %s", ipaddr_string(&bp->bp_ciaddr));
 120
 121         /* 'your' ip address (bootp client) */
 122         TCHECK(bp->bp_yiaddr);
 123         if (bp->bp_yiaddr.s_addr)
 124                 printf("\n\t  Your-IP %s", ipaddr_string(&bp->bp_yiaddr));
 125
 126         /* Server's ip address */
 127         TCHECK(bp->bp_siaddr);
 128         if (bp->bp_siaddr.s_addr)
 129                 printf("\n\t  Server-IP %s", ipaddr_string(&bp->bp_siaddr));
 130
 131         /* Gateway's ip address */
 132         TCHECK(bp->bp_giaddr);
 133         if (bp->bp_giaddr.s_addr)
 134                 printf("\n\t  Gateway-IP %s", ipaddr_string(&bp->bp_giaddr));
 135
 136         /* Client's Ethernet address */
 137         if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
 138                 TCHECK2(bp->bp_chaddr[0], 6);
 139                 printf("\n\t  Client-Ethernet-Address %s", etheraddr_string(bp->bp_chaddr));
 140         }
 141
 142         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 143         if (*bp->bp_sname) {
 144                 printf("\n\t  sname \"");
 145                 if (fn_print(bp->bp_sname, snapend)) {
 146                         putchar('"');
 147                         fputs(tstr + 1, stdout);
 148                         return;
 149                 }
 150                 putchar('"');
 151         }
 152         TCHECK2(bp->bp_file[0], 1);             /* check first char only */
 153         if (*bp->bp_file) {
 154                 printf("\n\t  file \"");
 155                 if (fn_print(bp->bp_file, snapend)) {
 156                         putchar('"');
 157                         fputs(tstr + 1, stdout);
 158                         return;
 159                 }
 160                 putchar('"');
 161         }
 162
 163         /* Decode the vendor buffer */
 164         TCHECK(bp->bp_vend[0]);
 165         if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
 166                  sizeof(u_int32_t)) == 0)
 167                 rfc1048_print(bp->bp_vend);
 168         else if (memcmp((const char *)bp->bp_vend, vm_cmu,
 169                       sizeof(u_int32_t)) == 0)
 170                 cmu_print(bp->bp_vend);
 171         else {
 172                 u_int32_t ul;
 173
 174                 ul = EXTRACT_32BITS(&bp->bp_vend);
 175                 if (ul != 0)
 176                         printf("\n\t  Vendor-#0x%x", ul);
 177         }
 178
 179         return;
 180 trunc:
 181         fputs(tstr, stdout);
 182 }
 183
 184 /*
 185  * The first character specifies the format to print:
 186  *     i - ip address (32 bits)
 187  *     p - ip address pairs (32 bits + 32 bits)
 188  *     l - long (32 bits)
 189  *     L - unsigned long (32 bits)
 190  *     s - short (16 bits)
 191  *     b - period-seperated decimal bytes (variable length)
 192  *     x - colon-seperated hex bytes (variable length)
 193  *     a - ascii string (variable length)
 194  *     B - on/off (8 bits)
 195  *     $ - special (explicit code to handle)
 196  */
 197 static struct tok tag2str[] = {
 198 /* RFC1048 tags */
 199         { TAG_PAD,              " PAD" },
 200         { TAG_SUBNET_MASK,      "iSubnet-Mask" },       /* subnet mask (RFC950) */
 201         { TAG_TIME_OFFSET,      "LTime-Zone" }, /* seconds from UTC */
 202         { TAG_GATEWAY,          "iDefault-Gateway" },   /* default gateway */
 203         { TAG_TIME_SERVER,      "iTime-Server" },       /* time servers (RFC868) */
 204         { TAG_NAME_SERVER,      "iIEN-Name-Server" },   /* IEN name servers (IEN116) */
 205         { TAG_DOMAIN_SERVER,    "iDomain-Name-Server" },        /* domain name (RFC1035) */
 206         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 207         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 208         { TAG_LPR_SERVER,       "iLPR-Server" },        /* lpr server (RFC1179) */
 209         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 210         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 211         { TAG_HOSTNAME,         "aHostname" },  /* ascii hostname */
 212         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 213         { TAG_END,              " END" },
 214 /* RFC1497 tags */
 215         { TAG_DUMPPATH,         "aDP" },
 216         { TAG_DOMAINNAME,       "aDomain-Name" },
 217         { TAG_SWAP_SERVER,      "iSS" },
 218         { TAG_ROOTPATH,         "aRP" },
 219         { TAG_EXTPATH,          "aEP" },
 220 /* RFC2132 tags */
 221         { TAG_IP_FORWARD,       "BIPF" },
 222         { TAG_NL_SRCRT,         "BSRT" },
 223         { TAG_PFILTERS,         "pPF" },
 224         { TAG_REASS_SIZE,       "sRSZ" },
 225         { TAG_DEF_TTL,          "bTTL" },
 226         { TAG_MTU_TIMEOUT,      "lMTU-Timeout" },
 227         { TAG_MTU_TABLE,        "sMTU-Table" },
 228         { TAG_INT_MTU,          "sMTU" },
 229         { TAG_LOCAL_SUBNETS,    "BLSN" },
 230         { TAG_BROAD_ADDR,       "iBR" },
 231         { TAG_DO_MASK_DISC,     "BMD" },
 232         { TAG_SUPPLY_MASK,      "BMS" },
 233         { TAG_DO_RDISC,         "BRouter-Discovery" },
 234         { TAG_RTR_SOL_ADDR,     "iRSA" },
 235         { TAG_STATIC_ROUTE,     "pStatic-Route" },
 236         { TAG_USE_TRAILERS,     "BUT" },
 237         { TAG_ARP_TIMEOUT,      "lAT" },
 238         { TAG_ETH_ENCAP,        "BIE" },
 239         { TAG_TCP_TTL,          "bTT" },
 240         { TAG_TCP_KEEPALIVE,    "lKI" },
 241         { TAG_KEEPALIVE_GO,     "BKG" },
 242         { TAG_NIS_DOMAIN,       "aYD" },
 243         { TAG_NIS_SERVERS,      "iYS" },
 244         { TAG_NTP_SERVERS,      "iNTP" },
 245         { TAG_VENDOR_OPTS,      "bVendor-Option" },
 246         { TAG_NETBIOS_NS,       "iNetbios-Name-Server" },
 247         { TAG_NETBIOS_DDS,      "iWDD" },
 248         { TAG_NETBIOS_NODE,     "$Netbios-Node" },
 249         { TAG_NETBIOS_SCOPE,    "aNetbios-Scope" },
 250         { TAG_XWIN_FS,          "iXFS" },
 251         { TAG_XWIN_DM,          "iXDM" },
 252         { TAG_NIS_P_DOMAIN,     "sN+D" },
 253         { TAG_NIS_P_SERVERS,    "iN+S" },
 254         { TAG_MOBILE_HOME,      "iMH" },
 255         { TAG_SMPT_SERVER,      "iSMTP" },
 256         { TAG_POP3_SERVER,      "iPOP3" },
 257         { TAG_NNTP_SERVER,      "iNNTP" },
 258         { TAG_WWW_SERVER,       "iWWW" },
 259         { TAG_FINGER_SERVER,    "iFG" },
 260         { TAG_IRC_SERVER,       "iIRC" },
 261         { TAG_STREETTALK_SRVR,  "iSTS" },
 262         { TAG_STREETTALK_STDA,  "iSTDA" },
 263         { TAG_REQUESTED_IP,     "iRequested-IP" },
 264         { TAG_IP_LEASE,         "lLease-Time" },
 265         { TAG_OPT_OVERLOAD,     "$OO" },
 266         { TAG_TFTP_SERVER,      "aTFTP" },
 267         { TAG_BOOTFILENAME,     "aBF" },
 268         { TAG_DHCP_MESSAGE,     " DHCP-Message" },
 269         { TAG_SERVER_ID,        "iServer-ID" },
 270         { TAG_PARM_REQUEST,     "bParameter-Request" },
 271         { TAG_MESSAGE,          "aMSG" },
 272         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 273         { TAG_RENEWAL_TIME,     "lRN" },
 274         { TAG_REBIND_TIME,      "lRB" },
 275         { TAG_VENDOR_CLASS,     "aVendor-Class" },
 276         { TAG_CLIENT_ID,        "$Client-ID" },
 277 /* RFC 2485 */
 278         { TAG_OPEN_GROUP_UAP,   "aUAP" },
 279 /* RFC 2563 */
 280         { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
 281 /* RFC 2610 */
 282         { TAG_SLP_DA,           "bSLP-DA" },    /*"b" is a little wrong */
 283         { TAG_SLP_SCOPE,        "bSLP-SCOPE" }, /*"b" is a little wrong */
 284 /* RFC 2937 */
 285         { TAG_NS_SEARCH,        "sNSSEARCH" },  /* XXX 's' */
 286 /* RFC 3011 */
 287         { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
 288 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
 289         { TAG_USER_CLASS,       "aCLASS" },
 290         { TAG_SLP_NAMING_AUTH,  "aSLP-NA" },
 291         { TAG_CLIENT_FQDN,      "$FQDN" },
 292         { TAG_AGENT_CIRCUIT,    "$Agent-Information" },
 293         { TAG_AGENT_REMOTE,     "bARMT" },
 294         { TAG_AGENT_MASK,       "bAMSK" },
 295         { TAG_TZ_STRING,        "aTZSTR" },
 296         { TAG_FQDN_OPTION,      "bFQDNS" },     /* XXX 'b' */
 297         { TAG_AUTH,             "bAUTH" },      /* XXX 'b' */
 298         { TAG_VINES_SERVERS,    "iVINES" },
 299         { TAG_SERVER_RANK,      "sRANK" },
 300         { TAG_CLIENT_ARCH,      "sARCH" },
 301         { TAG_CLIENT_NDI,       "bNDI" },       /* XXX 'b' */
 302         { TAG_CLIENT_GUID,      "bGUID" },      /* XXX 'b' */
 303         { TAG_LDAP_URL,         "aLDAP" },
 304         { TAG_6OVER4,           "i6o4" },
 305         { TAG_PRINTER_NAME,     "aPRTR" },
 306         { TAG_MDHCP_SERVER,     "bMDHCP" },     /* XXX 'b' */
 307         { TAG_IPX_COMPAT,       "bIPX" },       /* XXX 'b' */
 308         { TAG_NETINFO_PARENT,   "iNI" },
 309         { TAG_NETINFO_PARENT_TAG, "aNITAG" },
 310         { TAG_URL,              "aURL" },
 311         { TAG_FAILOVER,         "bFAIL" },      /* XXX 'b' */
 312         { 0,                    NULL }
 313 };
 314 /* 2-byte extended tags */
 315 static struct tok xtag2str[] = {
 316         { 0,                    NULL }
 317 };
 318
 319 /* DHCP "options overload" types */
 320 static struct tok oo2str[] = {
 321         { 1,                    "file" },
 322         { 2,                    "sname" },
 323         { 3,                    "file+sname" },
 324         { 0,                    NULL }
 325 };
 326
 327 /* NETBIOS over TCP/IP node type options */
 328 static struct tok nbo2str[] = {
 329         { 0x1,                  "b-node" },
 330         { 0x2,                  "p-node" },
 331         { 0x4,                  "m-node" },
 332         { 0x8,                  "h-node" },
 333         { 0,                    NULL }
 334 };
 335
 336 /* ARP Hardware types, for Client-ID option */
 337 static struct tok arp2str[] = {
 338         { 0x1,                  "ether" },
 339         { 0x6,                  "ieee802" },
 340         { 0x7,                  "arcnet" },
 341         { 0xf,                  "frelay" },
 342         { 0x17,                 "strip" },
 343         { 0x18,                 "ieee1394" },
 344         { 0,                    NULL }
 345 };
 346
 347 static struct tok dhcp_msg_values[] = {
 348         { DHCPDISCOVER, "Discover" },
 349         { DHCPOFFER, "Offer" },
 350         { DHCPREQUEST, "Request" },
 351         { DHCPDECLINE, "Decline" },
 352         { DHCPACK, "ACK" },
 353         { DHCPNAK, "NACK" },
 354         { DHCPRELEASE, "Release" },
 355         { DHCPINFORM, "Inform" },
 356         { 0,                    NULL }
 357 };
 358
 359 #define AGENT_SUBOPTION_CIRCUIT_ID 1
 360 static struct tok agent_suboption_values[] = {
 361         { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
 362         { 0,                    NULL }
 363 };
 364
 365
 366 static void
 367 rfc1048_print(register const u_char *bp)
 368 {
 369         register u_int16_t tag;
 370         register u_int len, size;
 371         register const char *cp;
 372         register char c;
 373         int first, idx;
 374         u_int32_t ul;
 375         u_int16_t us;
 376         u_int8_t uc, subopt, suboptlen;
 377
 378         printf("\n\t  Vendor-rfc1048 Extensions");
 379
 380         /* Step over magic cookie */
 381         printf("\n\t    Magic Cookie 0x%08x", EXTRACT_32BITS(bp));
 382         bp += sizeof(int32_t);
 383
 384         /* Loop while we there is a tag left in the buffer */
 385         while (TTEST2(*bp, 1)) {
 386                 tag = *bp++;
 387                 if (tag == TAG_PAD && vflag < 3)
 388                         continue;
 389                 if (tag == TAG_END && vflag < 3)
 390                         return;
 391                 if (tag == TAG_EXTENDED_OPTION) {
 392                         TCHECK2(*(bp + 1), 2);
 393                         tag = EXTRACT_16BITS(bp + 1);
 394                         /* XXX we don't know yet if the IANA will
 395                          * preclude overlap of 1-byte and 2-byte spaces.
 396                          * If not, we need to offset tag after this step.
 397                          */
 398                         cp = tok2str(xtag2str, "?xT%u", tag);
 399                 } else
 400                         cp = tok2str(tag2str, "?T%u", tag);
 401                 c = *cp++;
 402
 403                 if (tag == TAG_PAD || tag == TAG_END)
 404                         len = 0;
 405                 else {
 406                         /* Get the length; check for truncation */
 407                         TCHECK2(*bp, 1);
 408                         len = *bp++;
 409                 }
 410
 411                 printf("\n\t    %s Option %u, length %u%s", cp, tag, len,
 412                     len > 0 ? ": " : "");
 413
 414                 if (tag == TAG_PAD && vflag > 2) {
 415                         u_int ntag = 1;
 416                         while (TTEST2(*bp, 1) && *bp == TAG_PAD) {
 417                                 bp++;
 418                                 ntag++;
 419                         }
 420                         if (ntag > 1)
 421                                 printf(", occurs %u", ntag);
 422                 }
 423
 424                 if (!TTEST2(*bp, len)) {
 425                         printf("[|rfc1048 %u]", len);
 426                         return;
 427                 }
 428
 429                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 430                         uc = *bp++;
 431                         printf("%s", tok2str(dhcp_msg_values, "Unknown (%u)", uc));
 432                         continue;
 433                 }
 434
 435                 if (tag == TAG_PARM_REQUEST) {
 436                         idx = 0;
 437                         while (len-- > 0) {
 438                                 uc = *bp++;
 439                                 cp = tok2str(tag2str, "?Option %u", uc);
 440                                 if (idx % 4 == 0)
 441                                         printf("\n\t      ");
 442                                 else
 443                                         printf(", ");
 444                                 printf("%s", cp + 1);
 445                                 idx++;
 446                         }
 447                         continue;
 448                 }
 449
 450                 if (tag == TAG_EXTENDED_REQUEST) {
 451                         first = 1;
 452                         while (len > 1) {
 453                                 len -= 2;
 454                                 us = EXTRACT_16BITS(bp);
 455                                 bp += 2;
 456                                 cp = tok2str(xtag2str, "?xT%u", us);
 457                                 if (!first)
 458                                         putchar('+');
 459                                 printf("%s", cp + 1);
 460                                 first = 0;
 461                         }
 462                         continue;
 463                 }
 464
 465                 /* Print data */
 466                 size = len;
 467                 if (c == '?') {
 468                         /* Base default formats for unknown tags on data size */
 469                         if (size & 1)
 470                                 c = 'b';
 471                         else if (size & 2)
 472                                 c = 's';
 473                         else
 474                                 c = 'l';
 475                 }
 476                 first = 1;
 477                 switch (c) {
 478
 479                 case 'a':
 480                         /* ascii strings */
 481                         putchar('"');
 482                         if (fn_printn(bp, size, snapend)) {
 483                                 putchar('"');
 484                                 goto trunc;
 485                         }
 486                         putchar('"');
 487                         bp += size;
 488                         size = 0;
 489                         break;
 490
 491                 case 'i':
 492                 case 'l':
 493                 case 'L':
 494                         /* ip addresses/32-bit words */
 495                         while (size >= sizeof(ul)) {
 496                                 if (!first)
 497                                         putchar(',');
 498                                 ul = EXTRACT_32BITS(bp);
 499                                 if (c == 'i') {
 500                                         ul = htonl(ul);
 501                                         printf("%s", ipaddr_string(&ul));
 502                                 } else if (c == 'L')
 503                                         printf("%d", ul);
 504                                 else
 505                                         printf("%u", ul);
 506                                 bp += sizeof(ul);
 507                                 size -= sizeof(ul);
 508                                 first = 0;
 509                         }
 510                         break;
 511
 512                 case 'p':
 513                         /* IP address pairs */
 514                         while (size >= 2*sizeof(ul)) {
 515                                 if (!first)
 516                                         putchar(',');
 517                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 518                                 printf("(%s:", ipaddr_string(&ul));
 519                                 bp += sizeof(ul);
 520                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 521                                 printf("%s)", ipaddr_string(&ul));
 522                                 bp += sizeof(ul);
 523                                 size -= 2*sizeof(ul);
 524                                 first = 0;
 525                         }
 526                         break;
 527
 528                 case 's':
 529                         /* shorts */
 530                         while (size >= sizeof(us)) {
 531                                 if (!first)
 532                                         putchar(',');
 533                                 us = EXTRACT_16BITS(bp);
 534                                 printf("%u", us);
 535                                 bp += sizeof(us);
 536                                 size -= sizeof(us);
 537                                 first = 0;
 538                         }
 539                         break;
 540
 541                 case 'B':
 542                         /* boolean */
 543                         while (size > 0) {
 544                                 if (!first)
 545                                         putchar(',');
 546                                 switch (*bp) {
 547                                 case 0:
 548                                         putchar('N');
 549                                         break;
 550                                 case 1:
 551                                         putchar('Y');
 552                                         break;
 553                                 default:
 554                                         printf("%u?", *bp);
 555                                         break;
 556                                 }
 557                                 ++bp;
 558                                 --size;
 559                                 first = 0;
 560                         }
 561                         break;
 562
 563                 case 'b':
 564                 case 'x':
 565                 default:
 566                         /* Bytes */
 567                         while (size > 0) {
 568                                 if (!first)
 569                                         putchar(c == 'x' ? ':' : '.');
 570                                 if (c == 'x')
 571                                         printf("%02x", *bp);
 572                                 else
 573                                         printf("%u", *bp);
 574                                 ++bp;
 575                                 --size;
 576                                 first = 0;
 577                         }
 578                         break;
 579
 580                 case '$':
 581                         /* Guys we can't handle with one of the usual cases */
 582                         switch (tag) {
 583
 584                         case TAG_NETBIOS_NODE:
 585                                 tag = *bp++;
 586                                 --size;
 587                                 fputs(tok2str(nbo2str, NULL, tag), stdout);
 588                                 break;
 589
 590                         case TAG_OPT_OVERLOAD:
 591                                 tag = *bp++;
 592                                 --size;
 593                                 fputs(tok2str(oo2str, NULL, tag), stdout);
 594                                 break;
 595
 596                         case TAG_CLIENT_FQDN:
 597                                 /* option 81 should be at least 3 bytes long */
 598                                 if (len < 3)  {
 599                                         printf("ERROR: option 81 len %u < 3 bytes", len);
 600                                         break;
 601                                 }
 602                                 if (*bp)
 603                                         printf("[%s] ", client_fqdn_flags(*bp));
 604                                 bp++;
 605                                 if (*bp || *(bp+1))
 606                                         printf("%u/%u ", *bp, *(bp+1));
 607                                 bp += 2;
 608                                 putchar('"');
 609                                 if (fn_printn(bp, size - 3, snapend)) {
 610                                         putchar('"');
 611                                         goto trunc;
 612                                 }
 613                                 putchar('"');
 614                                 bp += size - 3;
 615                                 size = 0;
 616                                 break;
 617
 618                         case TAG_CLIENT_ID:
 619                             {   int type = *bp++;
 620                                 size--;
 621                                 if (type == 0) {
 622                                         putchar('"');
 623                                         if (fn_printn(bp, size, snapend)) {
 624                                                 putchar('"');
 625                                                 goto trunc;
 626                                         }
 627                                         putchar('"');
 628                                         bp += size;
 629                                         size = 0;
 630                                         break;
 631                                 } else {
 632                                         printf("%s ", tok2str(arp2str, "hardware-type %u,", type));
 633                                 }
 634                                 while (size > 0) {
 635                                         if (!first)
 636                                                 putchar(':');
 637                                         printf("%02x", *bp);
 638                                         ++bp;
 639                                         --size;
 640                                         first = 0;
 641                                 }
 642                                 break;
 643                             }
 644
 645                         case TAG_AGENT_CIRCUIT:
 646                         {
 647                             while (size > 0 ) {
 648                             subopt = *bp++;
 649                             suboptlen = *bp++;
 650                             size -= 2;
 651                             printf("\n\t      %s SubOption %u, length %u: ",
 652                                    tok2str(agent_suboption_values, "Unknown", subopt),
 653                                    subopt,
 654                                    suboptlen);
 655
 656                             if (subopt == 0 || suboptlen == 0) {
 657                                 break;
 658                             }
 659
 660                             switch(subopt) {
 661                             case AGENT_SUBOPTION_CIRCUIT_ID:
 662                                 for (idx = 0; idx < suboptlen; idx++) {
 663                                     safeputchar(*(bp+idx));
 664                                 }
 665                                 break;
 666                             default:
 667                                 print_unknown_data(bp, "\n\t\t", suboptlen);
 668                             }
 669
 670                             size -= suboptlen;
 671                             bp += suboptlen;
 672                             }
 673                         }
 674                             break;
 675
 676                         default:
 677                                 printf("[unknown special tag %u, size %u]",
 678                                     tag, size);
 679                                 bp += size;
 680                                 size = 0;
 681                                 break;
 682                         }
 683                         break;
 684                 }
 685                 /* Data left over? */
 686                 if (size) {
 687                         printf("\n\t  trailing data length %u", len);
 688                         bp += size;
 689                 }
 690         }
 691         return;
 692 trunc:
 693         printf("|[rfc1048]");
 694 }
 695
 696 static void
 697 cmu_print(register const u_char *bp)
 698 {
 699         register const struct cmu_vend *cmu;
 700
 701 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
 702     if (cmu->m.s_addr != 0) \
 703         printf(" %s:%s", s, ipaddr_string(&cmu->m.s_addr)); }
 704
 705         printf(" vend-cmu");
 706         cmu = (const struct cmu_vend *)bp;
 707
 708         /* Only print if there are unknown bits */
 709         TCHECK(cmu->v_flags);
 710         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
 711                 printf(" F:0x%x", cmu->v_flags);
 712         PRINTCMUADDR(v_dgate, "DG");
 713         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
 714         PRINTCMUADDR(v_dns1, "NS1");
 715         PRINTCMUADDR(v_dns2, "NS2");
 716         PRINTCMUADDR(v_ins1, "IEN1");
 717         PRINTCMUADDR(v_ins2, "IEN2");
 718         PRINTCMUADDR(v_ts1, "TS1");
 719         PRINTCMUADDR(v_ts2, "TS2");
 720         return;
 721
 722 trunc:
 723         fputs(tstr, stdout);
 724 #undef PRINTCMUADDR
 725 }
 726
 727 static char *
 728 client_fqdn_flags(u_int flags)
 729 {
 730         static char buf[8+1];
 731         int i = 0;
 732
 733         if (flags & CLIENT_FQDN_FLAGS_S)
 734                 buf[i++] = 'S';
 735         if (flags & CLIENT_FQDN_FLAGS_O)
 736                 buf[i++] = 'O';
 737         if (flags & CLIENT_FQDN_FLAGS_E)
 738                 buf[i++] = 'E';
 739         if (flags & CLIENT_FQDN_FLAGS_N)
 740                 buf[i++] = 'N';
 741         buf[i] = '\0';
 742
 743         return buf;
 744 }