contrib/tcpdump/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 1.89 2008-04-22 09:45:08 hannes 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 static char *client_fqdn_flags(u_int flags);
  46
  47 static char tstr[] = " [|bootp]";
  48
  49 static const struct tok bootp_flag_values[] = {
  50     { 0x8000,                   "Broadcast" },
  51     { 0, NULL}
  52 };
  53
  54 static const struct tok bootp_op_values[] = {
  55     { BOOTPREQUEST,             "Request" },
  56     { BOOTPREPLY,               "Reply" },
  57     { 0, NULL}
  58 };
  59
  60 /*
  61  * Print bootp requests
  62  */
  63 void
  64 bootp_print(register const u_char *cp, u_int length)
  65 {
  66         register const struct bootp *bp;
  67         static const u_char vm_cmu[4] = VM_CMU;
  68         static const u_char vm_rfc1048[4] = VM_RFC1048;
  69
  70         bp = (const struct bootp *)cp;
  71         TCHECK(bp->bp_op);
  72
  73         printf("BOOTP/DHCP, %s",
  74                tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op));
  75
  76         if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
  77                 TCHECK2(bp->bp_chaddr[0], 6);
  78                 printf(" from %s", etheraddr_string(bp->bp_chaddr));
  79         }
  80
  81         printf(", length %u", length);
  82
  83         if (!vflag)
  84             return;
  85
  86         TCHECK(bp->bp_secs);
  87
  88         /* The usual hardware address type is 1 (10Mb Ethernet) */
  89         if (bp->bp_htype != 1)
  90                 printf(", htype %d", bp->bp_htype);
  91
  92         /* The usual length for 10Mb Ethernet address is 6 bytes */
  93         if (bp->bp_htype != 1 || bp->bp_hlen != 6)
  94                 printf(", hlen %d", bp->bp_hlen);
  95
  96         /* Only print interesting fields */
  97         if (bp->bp_hops)
  98                 printf(", hops %d", bp->bp_hops);
  99         if (bp->bp_xid)
 100                 printf(", xid 0x%x", EXTRACT_32BITS(&bp->bp_xid));
 101         if (bp->bp_secs)
 102                 printf(", secs %d", EXTRACT_16BITS(&bp->bp_secs));
 103
 104         printf(", Flags [%s]",
 105                 bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags)));
 106         if (vflag > 1)
 107                 printf(" (0x%04x)", EXTRACT_16BITS(&bp->bp_flags));
 108
 109         /* Client's ip address */
 110         TCHECK(bp->bp_ciaddr);
 111         if (bp->bp_ciaddr.s_addr)
 112                 printf("\n\t  Client-IP %s", ipaddr_string(&bp->bp_ciaddr));
 113
 114         /* 'your' ip address (bootp client) */
 115         TCHECK(bp->bp_yiaddr);
 116         if (bp->bp_yiaddr.s_addr)
 117                 printf("\n\t  Your-IP %s", ipaddr_string(&bp->bp_yiaddr));
 118
 119         /* Server's ip address */
 120         TCHECK(bp->bp_siaddr);
 121         if (bp->bp_siaddr.s_addr)
 122                 printf("\n\t  Server-IP %s", ipaddr_string(&bp->bp_siaddr));
 123
 124         /* Gateway's ip address */
 125         TCHECK(bp->bp_giaddr);
 126         if (bp->bp_giaddr.s_addr)
 127                 printf("\n\t  Gateway-IP %s", ipaddr_string(&bp->bp_giaddr));
 128
 129         /* Client's Ethernet address */
 130         if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
 131                 TCHECK2(bp->bp_chaddr[0], 6);
 132                 printf("\n\t  Client-Ethernet-Address %s", etheraddr_string(bp->bp_chaddr));
 133         }
 134
 135         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 136         if (*bp->bp_sname) {
 137                 printf("\n\t  sname \"");
 138                 if (fn_print(bp->bp_sname, snapend)) {
 139                         putchar('"');
 140                         fputs(tstr + 1, stdout);
 141                         return;
 142                 }
 143                 putchar('"');
 144         }
 145         TCHECK2(bp->bp_file[0], 1);             /* check first char only */
 146         if (*bp->bp_file) {
 147                 printf("\n\t  file \"");
 148                 if (fn_print(bp->bp_file, snapend)) {
 149                         putchar('"');
 150                         fputs(tstr + 1, stdout);
 151                         return;
 152                 }
 153                 putchar('"');
 154         }
 155
 156         /* Decode the vendor buffer */
 157         TCHECK(bp->bp_vend[0]);
 158         if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
 159                  sizeof(u_int32_t)) == 0)
 160                 rfc1048_print(bp->bp_vend);
 161         else if (memcmp((const char *)bp->bp_vend, vm_cmu,
 162                       sizeof(u_int32_t)) == 0)
 163                 cmu_print(bp->bp_vend);
 164         else {
 165                 u_int32_t ul;
 166
 167                 ul = EXTRACT_32BITS(&bp->bp_vend);
 168                 if (ul != 0)
 169                         printf("\n\t  Vendor-#0x%x", ul);
 170         }
 171
 172         return;
 173 trunc:
 174         fputs(tstr, stdout);
 175 }
 176
 177 /*
 178  * The first character specifies the format to print:
 179  *     i - ip address (32 bits)
 180  *     p - ip address pairs (32 bits + 32 bits)
 181  *     l - long (32 bits)
 182  *     L - unsigned long (32 bits)
 183  *     s - short (16 bits)
 184  *     b - period-seperated decimal bytes (variable length)
 185  *     x - colon-seperated hex bytes (variable length)
 186  *     a - ascii string (variable length)
 187  *     B - on/off (8 bits)
 188  *     $ - special (explicit code to handle)
 189  */
 190 static struct tok tag2str[] = {
 191 /* RFC1048 tags */
 192         { TAG_PAD,              " PAD" },
 193         { TAG_SUBNET_MASK,      "iSubnet-Mask" },       /* subnet mask (RFC950) */
 194         { TAG_TIME_OFFSET,      "LTime-Zone" }, /* seconds from UTC */
 195         { TAG_GATEWAY,          "iDefault-Gateway" },   /* default gateway */
 196         { TAG_TIME_SERVER,      "iTime-Server" },       /* time servers (RFC868) */
 197         { TAG_NAME_SERVER,      "iIEN-Name-Server" },   /* IEN name servers (IEN116) */
 198         { TAG_DOMAIN_SERVER,    "iDomain-Name-Server" },        /* domain name (RFC1035) */
 199         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 200         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 201         { TAG_LPR_SERVER,       "iLPR-Server" },        /* lpr server (RFC1179) */
 202         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 203         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 204         { TAG_HOSTNAME,         "aHostname" },  /* ascii hostname */
 205         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 206         { TAG_END,              " END" },
 207 /* RFC1497 tags */
 208         { TAG_DUMPPATH,         "aDP" },
 209         { TAG_DOMAINNAME,       "aDomain-Name" },
 210         { TAG_SWAP_SERVER,      "iSS" },
 211         { TAG_ROOTPATH,         "aRP" },
 212         { TAG_EXTPATH,          "aEP" },
 213 /* RFC2132 tags */
 214         { TAG_IP_FORWARD,       "BIPF" },
 215         { TAG_NL_SRCRT,         "BSRT" },
 216         { TAG_PFILTERS,         "pPF" },
 217         { TAG_REASS_SIZE,       "sRSZ" },
 218         { TAG_DEF_TTL,          "bTTL" },
 219         { TAG_MTU_TIMEOUT,      "lMTU-Timeout" },
 220         { TAG_MTU_TABLE,        "sMTU-Table" },
 221         { TAG_INT_MTU,          "sMTU" },
 222         { TAG_LOCAL_SUBNETS,    "BLSN" },
 223         { TAG_BROAD_ADDR,       "iBR" },
 224         { TAG_DO_MASK_DISC,     "BMD" },
 225         { TAG_SUPPLY_MASK,      "BMS" },
 226         { TAG_DO_RDISC,         "BRouter-Discovery" },
 227         { TAG_RTR_SOL_ADDR,     "iRSA" },
 228         { TAG_STATIC_ROUTE,     "pStatic-Route" },
 229         { TAG_USE_TRAILERS,     "BUT" },
 230         { TAG_ARP_TIMEOUT,      "lAT" },
 231         { TAG_ETH_ENCAP,        "BIE" },
 232         { TAG_TCP_TTL,          "bTT" },
 233         { TAG_TCP_KEEPALIVE,    "lKI" },
 234         { TAG_KEEPALIVE_GO,     "BKG" },
 235         { TAG_NIS_DOMAIN,       "aYD" },
 236         { TAG_NIS_SERVERS,      "iYS" },
 237         { TAG_NTP_SERVERS,      "iNTP" },
 238         { TAG_VENDOR_OPTS,      "bVendor-Option" },
 239         { TAG_NETBIOS_NS,       "iNetbios-Name-Server" },
 240         { TAG_NETBIOS_DDS,      "iWDD" },
 241         { TAG_NETBIOS_NODE,     "$Netbios-Node" },
 242         { TAG_NETBIOS_SCOPE,    "aNetbios-Scope" },
 243         { TAG_XWIN_FS,          "iXFS" },
 244         { TAG_XWIN_DM,          "iXDM" },
 245         { TAG_NIS_P_DOMAIN,     "sN+D" },
 246         { TAG_NIS_P_SERVERS,    "iN+S" },
 247         { TAG_MOBILE_HOME,      "iMH" },
 248         { TAG_SMPT_SERVER,      "iSMTP" },
 249         { TAG_POP3_SERVER,      "iPOP3" },
 250         { TAG_NNTP_SERVER,      "iNNTP" },
 251         { TAG_WWW_SERVER,       "iWWW" },
 252         { TAG_FINGER_SERVER,    "iFG" },
 253         { TAG_IRC_SERVER,       "iIRC" },
 254         { TAG_STREETTALK_SRVR,  "iSTS" },
 255         { TAG_STREETTALK_STDA,  "iSTDA" },
 256         { TAG_REQUESTED_IP,     "iRequested-IP" },
 257         { TAG_IP_LEASE,         "lLease-Time" },
 258         { TAG_OPT_OVERLOAD,     "$OO" },
 259         { TAG_TFTP_SERVER,      "aTFTP" },
 260         { TAG_BOOTFILENAME,     "aBF" },
 261         { TAG_DHCP_MESSAGE,     " DHCP-Message" },
 262         { TAG_SERVER_ID,        "iServer-ID" },
 263         { TAG_PARM_REQUEST,     "bParameter-Request" },
 264         { TAG_MESSAGE,          "aMSG" },
 265         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 266         { TAG_RENEWAL_TIME,     "lRN" },
 267         { TAG_REBIND_TIME,      "lRB" },
 268         { TAG_VENDOR_CLASS,     "aVendor-Class" },
 269         { TAG_CLIENT_ID,        "$Client-ID" },
 270 /* RFC 2485 */
 271         { TAG_OPEN_GROUP_UAP,   "aUAP" },
 272 /* RFC 2563 */
 273         { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
 274 /* RFC 2610 */
 275         { TAG_SLP_DA,           "bSLP-DA" },    /*"b" is a little wrong */
 276         { TAG_SLP_SCOPE,        "bSLP-SCOPE" }, /*"b" is a little wrong */
 277 /* RFC 2937 */
 278         { TAG_NS_SEARCH,        "sNSSEARCH" },  /* XXX 's' */
 279 /* RFC 3011 */
 280         { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
 281 /* RFC 3442 */
 282         { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" },
 283         { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" },
 284 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
 285         { TAG_USER_CLASS,       "aCLASS" },
 286         { TAG_SLP_NAMING_AUTH,  "aSLP-NA" },
 287         { TAG_CLIENT_FQDN,      "$FQDN" },
 288         { TAG_AGENT_CIRCUIT,    "$Agent-Information" },
 289         { TAG_AGENT_REMOTE,     "bARMT" },
 290         { TAG_AGENT_MASK,       "bAMSK" },
 291         { TAG_TZ_STRING,        "aTZSTR" },
 292         { TAG_FQDN_OPTION,      "bFQDNS" },     /* XXX 'b' */
 293         { TAG_AUTH,             "bAUTH" },      /* XXX 'b' */
 294         { TAG_VINES_SERVERS,    "iVINES" },
 295         { TAG_SERVER_RANK,      "sRANK" },
 296         { TAG_CLIENT_ARCH,      "sARCH" },
 297         { TAG_CLIENT_NDI,       "bNDI" },       /* XXX 'b' */
 298         { TAG_CLIENT_GUID,      "bGUID" },      /* XXX 'b' */
 299         { TAG_LDAP_URL,         "aLDAP" },
 300         { TAG_6OVER4,           "i6o4" },
 301         { TAG_PRINTER_NAME,     "aPRTR" },
 302         { TAG_MDHCP_SERVER,     "bMDHCP" },     /* XXX 'b' */
 303         { TAG_IPX_COMPAT,       "bIPX" },       /* XXX 'b' */
 304         { TAG_NETINFO_PARENT,   "iNI" },
 305         { TAG_NETINFO_PARENT_TAG, "aNITAG" },
 306         { TAG_URL,              "aURL" },
 307         { TAG_FAILOVER,         "bFAIL" },      /* XXX 'b' */
 308         { 0,                    NULL }
 309 };
 310 /* 2-byte extended tags */
 311 static struct tok xtag2str[] = {
 312         { 0,                    NULL }
 313 };
 314
 315 /* DHCP "options overload" types */
 316 static struct tok oo2str[] = {
 317         { 1,                    "file" },
 318         { 2,                    "sname" },
 319         { 3,                    "file+sname" },
 320         { 0,                    NULL }
 321 };
 322
 323 /* NETBIOS over TCP/IP node type options */
 324 static struct tok nbo2str[] = {
 325         { 0x1,                  "b-node" },
 326         { 0x2,                  "p-node" },
 327         { 0x4,                  "m-node" },
 328         { 0x8,                  "h-node" },
 329         { 0,                    NULL }
 330 };
 331
 332 /* ARP Hardware types, for Client-ID option */
 333 static struct tok arp2str[] = {
 334         { 0x1,                  "ether" },
 335         { 0x6,                  "ieee802" },
 336         { 0x7,                  "arcnet" },
 337         { 0xf,                  "frelay" },
 338         { 0x17,                 "strip" },
 339         { 0x18,                 "ieee1394" },
 340         { 0,                    NULL }
 341 };
 342
 343 static struct tok dhcp_msg_values[] = {
 344         { DHCPDISCOVER, "Discover" },
 345         { DHCPOFFER, "Offer" },
 346         { DHCPREQUEST, "Request" },
 347         { DHCPDECLINE, "Decline" },
 348         { DHCPACK, "ACK" },
 349         { DHCPNAK, "NACK" },
 350         { DHCPRELEASE, "Release" },
 351         { DHCPINFORM, "Inform" },
 352         { 0,                    NULL }
 353 };
 354
 355 #define AGENT_SUBOPTION_CIRCUIT_ID      1       /* RFC 3046 */
 356 #define AGENT_SUBOPTION_REMOTE_ID       2       /* RFC 3046 */
 357 #define AGENT_SUBOPTION_SUBSCRIBER_ID   6       /* RFC 3993 */
 358 static struct tok agent_suboption_values[] = {
 359         { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
 360         { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" },
 361         { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-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;
 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                 if (c == '?') {
 467                         /* Base default formats for unknown tags on data size */
 468                         if (len & 1)
 469                                 c = 'b';
 470                         else if (len & 2)
 471                                 c = 's';
 472                         else
 473                                 c = 'l';
 474                 }
 475                 first = 1;
 476                 switch (c) {
 477
 478                 case 'a':
 479                         /* ascii strings */
 480                         putchar('"');
 481                         if (fn_printn(bp, len, snapend)) {
 482                                 putchar('"');
 483                                 goto trunc;
 484                         }
 485                         putchar('"');
 486                         bp += len;
 487                         len = 0;
 488                         break;
 489
 490                 case 'i':
 491                 case 'l':
 492                 case 'L':
 493                         /* ip addresses/32-bit words */
 494                         while (len >= sizeof(ul)) {
 495                                 if (!first)
 496                                         putchar(',');
 497                                 ul = EXTRACT_32BITS(bp);
 498                                 if (c == 'i') {
 499                                         ul = htonl(ul);
 500                                         printf("%s", ipaddr_string(&ul));
 501                                 } else if (c == 'L')
 502                                         printf("%d", ul);
 503                                 else
 504                                         printf("%u", ul);
 505                                 bp += sizeof(ul);
 506                                 len -= sizeof(ul);
 507                                 first = 0;
 508                         }
 509                         break;
 510
 511                 case 'p':
 512                         /* IP address pairs */
 513                         while (len >= 2*sizeof(ul)) {
 514                                 if (!first)
 515                                         putchar(',');
 516                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 517                                 printf("(%s:", ipaddr_string(&ul));
 518                                 bp += sizeof(ul);
 519                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 520                                 printf("%s)", ipaddr_string(&ul));
 521                                 bp += sizeof(ul);
 522                                 len -= 2*sizeof(ul);
 523                                 first = 0;
 524                         }
 525                         break;
 526
 527                 case 's':
 528                         /* shorts */
 529                         while (len >= sizeof(us)) {
 530                                 if (!first)
 531                                         putchar(',');
 532                                 us = EXTRACT_16BITS(bp);
 533                                 printf("%u", us);
 534                                 bp += sizeof(us);
 535                                 len -= sizeof(us);
 536                                 first = 0;
 537                         }
 538                         break;
 539
 540                 case 'B':
 541                         /* boolean */
 542                         while (len > 0) {
 543                                 if (!first)
 544                                         putchar(',');
 545                                 switch (*bp) {
 546                                 case 0:
 547                                         putchar('N');
 548                                         break;
 549                                 case 1:
 550                                         putchar('Y');
 551                                         break;
 552                                 default:
 553                                         printf("%u?", *bp);
 554                                         break;
 555                                 }
 556                                 ++bp;
 557                                 --len;
 558                                 first = 0;
 559                         }
 560                         break;
 561
 562                 case 'b':
 563                 case 'x':
 564                 default:
 565                         /* Bytes */
 566                         while (len > 0) {
 567                                 if (!first)
 568                                         putchar(c == 'x' ? ':' : '.');
 569                                 if (c == 'x')
 570                                         printf("%02x", *bp);
 571                                 else
 572                                         printf("%u", *bp);
 573                                 ++bp;
 574                                 --len;
 575                                 first = 0;
 576                         }
 577                         break;
 578
 579                 case '$':
 580                         /* Guys we can't handle with one of the usual cases */
 581                         switch (tag) {
 582
 583                         case TAG_NETBIOS_NODE:
 584                                 /* this option should be at least 1 byte long */
 585                                 if (len < 1)  {
 586                                         printf("ERROR: option %u len %u < 1 bytes",
 587                                             TAG_NETBIOS_NODE, len);
 588                                         break;
 589                                 }
 590                                 tag = *bp++;
 591                                 --len;
 592                                 fputs(tok2str(nbo2str, NULL, tag), stdout);
 593                                 break;
 594
 595                         case TAG_OPT_OVERLOAD:
 596                                 /* this option should be at least 1 byte long */
 597                                 if (len < 1)  {
 598                                         printf("ERROR: option %u len %u < 1 bytes",
 599                                             TAG_OPT_OVERLOAD, len);
 600                                         break;
 601                                 }
 602                                 tag = *bp++;
 603                                 --len;
 604                                 fputs(tok2str(oo2str, NULL, tag), stdout);
 605                                 break;
 606
 607                         case TAG_CLIENT_FQDN:
 608                                 /* this option should be at least 3 bytes long */
 609                                 if (len < 3)  {
 610                                         printf("ERROR: option %u len %u < 3 bytes",
 611                                             TAG_CLIENT_FQDN, len);
 612                                         bp += len;
 613                                         len = 0;
 614                                         break;
 615                                 }
 616                                 if (*bp)
 617                                         printf("[%s] ", client_fqdn_flags(*bp));
 618                                 bp++;
 619                                 if (*bp || *(bp+1))
 620                                         printf("%u/%u ", *bp, *(bp+1));
 621                                 bp += 2;
 622                                 putchar('"');
 623                                 if (fn_printn(bp, len - 3, snapend)) {
 624                                         putchar('"');
 625                                         goto trunc;
 626                                 }
 627                                 putchar('"');
 628                                 bp += len - 3;
 629                                 len = 0;
 630                                 break;
 631
 632                         case TAG_CLIENT_ID:
 633                             {   int type;
 634
 635                                 /* this option should be at least 1 byte long */
 636                                 if (len < 1)  {
 637                                         printf("ERROR: option %u len %u < 1 bytes",
 638                                             TAG_CLIENT_ID, len);
 639                                         break;
 640                                 }
 641                                 type = *bp++;
 642                                 len--;
 643                                 if (type == 0) {
 644                                         putchar('"');
 645                                         if (fn_printn(bp, len, snapend)) {
 646                                                 putchar('"');
 647                                                 goto trunc;
 648                                         }
 649                                         putchar('"');
 650                                         bp += len;
 651                                         len = 0;
 652                                         break;
 653                                 } else {
 654                                         printf("%s ", tok2str(arp2str, "hardware-type %u,", type));
 655                                         while (len > 0) {
 656                                                 if (!first)
 657                                                         putchar(':');
 658                                                 printf("%02x", *bp);
 659                                                 ++bp;
 660                                                 --len;
 661                                                 first = 0;
 662                                         }
 663                                 }
 664                                 break;
 665                             }
 666
 667                         case TAG_AGENT_CIRCUIT:
 668                                 while (len >= 2) {
 669                                         subopt = *bp++;
 670                                         suboptlen = *bp++;
 671                                         len -= 2;
 672                                         if (suboptlen > len) {
 673                                                 printf("\n\t      %s SubOption %u, length %u: length goes past end of option",
 674                                                    tok2str(agent_suboption_values, "Unknown", subopt),
 675                                                    subopt,
 676                                                    suboptlen);
 677                                                 bp += len;
 678                                                 len = 0;
 679                                                 break;
 680                                         }
 681                                         printf("\n\t      %s SubOption %u, length %u: ",
 682                                            tok2str(agent_suboption_values, "Unknown", subopt),
 683                                            subopt,
 684                                            suboptlen);
 685                                         switch (subopt) {
 686
 687                                         case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */
 688                                         case AGENT_SUBOPTION_REMOTE_ID:
 689                                         case AGENT_SUBOPTION_SUBSCRIBER_ID:
 690                                                 fn_printn(bp, suboptlen, NULL);
 691                                                 break;
 692
 693                                         default:
 694                                                 print_unknown_data(bp, "\n\t\t", suboptlen);
 695                                         }
 696
 697                                         len -= suboptlen;
 698                                         bp += suboptlen;
 699                             }
 700                             break;
 701
 702                         case TAG_CLASSLESS_STATIC_RT:
 703                         case TAG_CLASSLESS_STA_RT_MS:
 704                         {
 705                                 u_int mask_width, significant_octets, i;
 706
 707                                 /* this option should be at least 5 bytes long */
 708                                 if (len < 5)  {
 709                                         printf("ERROR: option %u len %u < 5 bytes",
 710                                             TAG_CLASSLESS_STATIC_RT, len);
 711                                         bp += len;
 712                                         len = 0;
 713                                         break;
 714                                 }
 715                                 while (len > 0) {
 716                                         if (!first)
 717                                                 putchar(',');
 718                                         mask_width = *bp++;
 719                                         len--;
 720                                         /* mask_width <= 32 */
 721                                         if (mask_width > 32) {
 722                                                 printf("[ERROR: Mask width (%d) > 32]",  mask_width);
 723                                                 bp += len;
 724                                                 len = 0;
 725                                                 break;
 726                                         }
 727                                         significant_octets = (mask_width + 7) / 8;
 728                                         /* significant octets + router(4) */
 729                                         if (len < significant_octets + 4) {
 730                                                 printf("[ERROR: Remaining length (%u) < %u bytes]",  len, significant_octets + 4);
 731                                                 bp += len;
 732                                                 len = 0;
 733                                                 break;
 734                                         }
 735                                         putchar('(');
 736                                         if (mask_width == 0)
 737                                                 printf("default");
 738                                         else {
 739                                                 for (i = 0; i < significant_octets ; i++) {
 740                                                         if (i > 0)
 741                                                                 putchar('.');
 742                                                         printf("%d", *bp++);
 743                                                 }
 744                                                 for (i = significant_octets ; i < 4 ; i++)
 745                                                         printf(".0");
 746                                                 printf("/%d", mask_width);
 747                                         }
 748                                         memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 749                                         printf(":%s)", ipaddr_string(&ul));
 750                                         bp += sizeof(ul);
 751                                         len -= (significant_octets + 4);
 752                                         first = 0;
 753                                 }
 754                         }
 755                         break;
 756
 757                         default:
 758                                 printf("[unknown special tag %u, size %u]",
 759                                     tag, len);
 760                                 bp += len;
 761                                 len = 0;
 762                                 break;
 763                         }
 764                         break;
 765                 }
 766                 /* Data left over? */
 767                 if (len) {
 768                         printf("\n\t  trailing data length %u", len);
 769                         bp += len;
 770                 }
 771         }
 772         return;
 773 trunc:
 774         printf("|[rfc1048]");
 775 }
 776
 777 static void
 778 cmu_print(register const u_char *bp)
 779 {
 780         register const struct cmu_vend *cmu;
 781
 782 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
 783     if (cmu->m.s_addr != 0) \
 784         printf(" %s:%s", s, ipaddr_string(&cmu->m.s_addr)); }
 785
 786         printf(" vend-cmu");
 787         cmu = (const struct cmu_vend *)bp;
 788
 789         /* Only print if there are unknown bits */
 790         TCHECK(cmu->v_flags);
 791         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
 792                 printf(" F:0x%x", cmu->v_flags);
 793         PRINTCMUADDR(v_dgate, "DG");
 794         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
 795         PRINTCMUADDR(v_dns1, "NS1");
 796         PRINTCMUADDR(v_dns2, "NS2");
 797         PRINTCMUADDR(v_ins1, "IEN1");
 798         PRINTCMUADDR(v_ins2, "IEN2");
 799         PRINTCMUADDR(v_ts1, "TS1");
 800         PRINTCMUADDR(v_ts2, "TS2");
 801         return;
 802
 803 trunc:
 804         fputs(tstr, stdout);
 805 #undef PRINTCMUADDR
 806 }
 807
 808 static char *
 809 client_fqdn_flags(u_int flags)
 810 {
 811         static char buf[8+1];
 812         int i = 0;
 813
 814         if (flags & CLIENT_FQDN_FLAGS_S)
 815                 buf[i++] = 'S';
 816         if (flags & CLIENT_FQDN_FLAGS_O)
 817                 buf[i++] = 'O';
 818         if (flags & CLIENT_FQDN_FLAGS_E)
 819                 buf[i++] = 'E';
 820         if (flags & CLIENT_FQDN_FLAGS_N)
 821                 buf[i++] = 'N';
 822         buf[i] = '\0';
 823
 824         return buf;
 825 }