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 1.86 2007-07-24 17:28:56 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 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 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
 284         { TAG_USER_CLASS,       "aCLASS" },
 285         { TAG_SLP_NAMING_AUTH,  "aSLP-NA" },
 286         { TAG_CLIENT_FQDN,      "$FQDN" },
 287         { TAG_AGENT_CIRCUIT,    "$Agent-Information" },
 288         { TAG_AGENT_REMOTE,     "bARMT" },
 289         { TAG_AGENT_MASK,       "bAMSK" },
 290         { TAG_TZ_STRING,        "aTZSTR" },
 291         { TAG_FQDN_OPTION,      "bFQDNS" },     /* XXX 'b' */
 292         { TAG_AUTH,             "bAUTH" },      /* XXX 'b' */
 293         { TAG_VINES_SERVERS,    "iVINES" },
 294         { TAG_SERVER_RANK,      "sRANK" },
 295         { TAG_CLIENT_ARCH,      "sARCH" },
 296         { TAG_CLIENT_NDI,       "bNDI" },       /* XXX 'b' */
 297         { TAG_CLIENT_GUID,      "bGUID" },      /* XXX 'b' */
 298         { TAG_LDAP_URL,         "aLDAP" },
 299         { TAG_6OVER4,           "i6o4" },
 300         { TAG_PRINTER_NAME,     "aPRTR" },
 301         { TAG_MDHCP_SERVER,     "bMDHCP" },     /* XXX 'b' */
 302         { TAG_IPX_COMPAT,       "bIPX" },       /* XXX 'b' */
 303         { TAG_NETINFO_PARENT,   "iNI" },
 304         { TAG_NETINFO_PARENT_TAG, "aNITAG" },
 305         { TAG_URL,              "aURL" },
 306         { TAG_FAILOVER,         "bFAIL" },      /* XXX 'b' */
 307         { 0,                    NULL }
 308 };
 309 /* 2-byte extended tags */
 310 static struct tok xtag2str[] = {
 311         { 0,                    NULL }
 312 };
 313
 314 /* DHCP "options overload" types */
 315 static struct tok oo2str[] = {
 316         { 1,                    "file" },
 317         { 2,                    "sname" },
 318         { 3,                    "file+sname" },
 319         { 0,                    NULL }
 320 };
 321
 322 /* NETBIOS over TCP/IP node type options */
 323 static struct tok nbo2str[] = {
 324         { 0x1,                  "b-node" },
 325         { 0x2,                  "p-node" },
 326         { 0x4,                  "m-node" },
 327         { 0x8,                  "h-node" },
 328         { 0,                    NULL }
 329 };
 330
 331 /* ARP Hardware types, for Client-ID option */
 332 static struct tok arp2str[] = {
 333         { 0x1,                  "ether" },
 334         { 0x6,                  "ieee802" },
 335         { 0x7,                  "arcnet" },
 336         { 0xf,                  "frelay" },
 337         { 0x17,                 "strip" },
 338         { 0x18,                 "ieee1394" },
 339         { 0,                    NULL }
 340 };
 341
 342 static struct tok dhcp_msg_values[] = {
 343         { DHCPDISCOVER, "Discover" },
 344         { DHCPOFFER, "Offer" },
 345         { DHCPREQUEST, "Request" },
 346         { DHCPDECLINE, "Decline" },
 347         { DHCPACK, "ACK" },
 348         { DHCPNAK, "NACK" },
 349         { DHCPRELEASE, "Release" },
 350         { DHCPINFORM, "Inform" },
 351         { 0,                    NULL }
 352 };
 353
 354 #define AGENT_SUBOPTION_CIRCUIT_ID 1
 355 static struct tok agent_suboption_values[] = {
 356         { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
 357         { 0,                    NULL }
 358 };
 359
 360
 361 static void
 362 rfc1048_print(register const u_char *bp)
 363 {
 364         register u_int16_t tag;
 365         register u_int len;
 366         register const char *cp;
 367         register char c;
 368         int first, idx;
 369         u_int32_t ul;
 370         u_int16_t us;
 371         u_int8_t uc, subopt, suboptlen;
 372
 373         printf("\n\t  Vendor-rfc1048 Extensions");
 374
 375         /* Step over magic cookie */
 376         printf("\n\t    Magic Cookie 0x%08x", EXTRACT_32BITS(bp));
 377         bp += sizeof(int32_t);
 378
 379         /* Loop while we there is a tag left in the buffer */
 380         while (TTEST2(*bp, 1)) {
 381                 tag = *bp++;
 382                 if (tag == TAG_PAD && vflag < 3)
 383                         continue;
 384                 if (tag == TAG_END && vflag < 3)
 385                         return;
 386                 if (tag == TAG_EXTENDED_OPTION) {
 387                         TCHECK2(*(bp + 1), 2);
 388                         tag = EXTRACT_16BITS(bp + 1);
 389                         /* XXX we don't know yet if the IANA will
 390                          * preclude overlap of 1-byte and 2-byte spaces.
 391                          * If not, we need to offset tag after this step.
 392                          */
 393                         cp = tok2str(xtag2str, "?xT%u", tag);
 394                 } else
 395                         cp = tok2str(tag2str, "?T%u", tag);
 396                 c = *cp++;
 397
 398                 if (tag == TAG_PAD || tag == TAG_END)
 399                         len = 0;
 400                 else {
 401                         /* Get the length; check for truncation */
 402                         TCHECK2(*bp, 1);
 403                         len = *bp++;
 404                 }
 405
 406                 printf("\n\t    %s Option %u, length %u%s", cp, tag, len,
 407                     len > 0 ? ": " : "");
 408
 409                 if (tag == TAG_PAD && vflag > 2) {
 410                         u_int ntag = 1;
 411                         while (TTEST2(*bp, 1) && *bp == TAG_PAD) {
 412                                 bp++;
 413                                 ntag++;
 414                         }
 415                         if (ntag > 1)
 416                                 printf(", occurs %u", ntag);
 417                 }
 418
 419                 if (!TTEST2(*bp, len)) {
 420                         printf("[|rfc1048 %u]", len);
 421                         return;
 422                 }
 423
 424                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 425                         uc = *bp++;
 426                         printf("%s", tok2str(dhcp_msg_values, "Unknown (%u)", uc));
 427                         continue;
 428                 }
 429
 430                 if (tag == TAG_PARM_REQUEST) {
 431                         idx = 0;
 432                         while (len-- > 0) {
 433                                 uc = *bp++;
 434                                 cp = tok2str(tag2str, "?Option %u", uc);
 435                                 if (idx % 4 == 0)
 436                                         printf("\n\t      ");
 437                                 else
 438                                         printf(", ");
 439                                 printf("%s", cp + 1);
 440                                 idx++;
 441                         }
 442                         continue;
 443                 }
 444
 445                 if (tag == TAG_EXTENDED_REQUEST) {
 446                         first = 1;
 447                         while (len > 1) {
 448                                 len -= 2;
 449                                 us = EXTRACT_16BITS(bp);
 450                                 bp += 2;
 451                                 cp = tok2str(xtag2str, "?xT%u", us);
 452                                 if (!first)
 453                                         putchar('+');
 454                                 printf("%s", cp + 1);
 455                                 first = 0;
 456                         }
 457                         continue;
 458                 }
 459
 460                 /* Print data */
 461                 if (c == '?') {
 462                         /* Base default formats for unknown tags on data size */
 463                         if (len & 1)
 464                                 c = 'b';
 465                         else if (len & 2)
 466                                 c = 's';
 467                         else
 468                                 c = 'l';
 469                 }
 470                 first = 1;
 471                 switch (c) {
 472
 473                 case 'a':
 474                         /* ascii strings */
 475                         putchar('"');
 476                         if (fn_printn(bp, len, snapend)) {
 477                                 putchar('"');
 478                                 goto trunc;
 479                         }
 480                         putchar('"');
 481                         bp += len;
 482                         len = 0;
 483                         break;
 484
 485                 case 'i':
 486                 case 'l':
 487                 case 'L':
 488                         /* ip addresses/32-bit words */
 489                         while (len >= sizeof(ul)) {
 490                                 if (!first)
 491                                         putchar(',');
 492                                 ul = EXTRACT_32BITS(bp);
 493                                 if (c == 'i') {
 494                                         ul = htonl(ul);
 495                                         printf("%s", ipaddr_string(&ul));
 496                                 } else if (c == 'L')
 497                                         printf("%d", ul);
 498                                 else
 499                                         printf("%u", ul);
 500                                 bp += sizeof(ul);
 501                                 len -= sizeof(ul);
 502                                 first = 0;
 503                         }
 504                         break;
 505
 506                 case 'p':
 507                         /* IP address pairs */
 508                         while (len >= 2*sizeof(ul)) {
 509                                 if (!first)
 510                                         putchar(',');
 511                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 512                                 printf("(%s:", ipaddr_string(&ul));
 513                                 bp += sizeof(ul);
 514                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 515                                 printf("%s)", ipaddr_string(&ul));
 516                                 bp += sizeof(ul);
 517                                 len -= 2*sizeof(ul);
 518                                 first = 0;
 519                         }
 520                         break;
 521
 522                 case 's':
 523                         /* shorts */
 524                         while (len >= sizeof(us)) {
 525                                 if (!first)
 526                                         putchar(',');
 527                                 us = EXTRACT_16BITS(bp);
 528                                 printf("%u", us);
 529                                 bp += sizeof(us);
 530                                 len -= sizeof(us);
 531                                 first = 0;
 532                         }
 533                         break;
 534
 535                 case 'B':
 536                         /* boolean */
 537                         while (len > 0) {
 538                                 if (!first)
 539                                         putchar(',');
 540                                 switch (*bp) {
 541                                 case 0:
 542                                         putchar('N');
 543                                         break;
 544                                 case 1:
 545                                         putchar('Y');
 546                                         break;
 547                                 default:
 548                                         printf("%u?", *bp);
 549                                         break;
 550                                 }
 551                                 ++bp;
 552                                 --len;
 553                                 first = 0;
 554                         }
 555                         break;
 556
 557                 case 'b':
 558                 case 'x':
 559                 default:
 560                         /* Bytes */
 561                         while (len > 0) {
 562                                 if (!first)
 563                                         putchar(c == 'x' ? ':' : '.');
 564                                 if (c == 'x')
 565                                         printf("%02x", *bp);
 566                                 else
 567                                         printf("%u", *bp);
 568                                 ++bp;
 569                                 --len;
 570                                 first = 0;
 571                         }
 572                         break;
 573
 574                 case '$':
 575                         /* Guys we can't handle with one of the usual cases */
 576                         switch (tag) {
 577
 578                         case TAG_NETBIOS_NODE:
 579                                 /* this option should be at least 1 byte long */
 580                                 if (len < 1)  {
 581                                         printf("ERROR: option %u len %u < 1 bytes",
 582                                             TAG_NETBIOS_NODE, len);
 583                                         bp += len;
 584                                         len = 0;
 585                                         break;
 586                                 }
 587                                 tag = *bp++;
 588                                 --len;
 589                                 fputs(tok2str(nbo2str, NULL, tag), stdout);
 590                                 break;
 591
 592                         case TAG_OPT_OVERLOAD:
 593                                 /* this option should be at least 1 byte long */
 594                                 if (len < 1)  {
 595                                         printf("ERROR: option %u len %u < 1 bytes",
 596                                             TAG_OPT_OVERLOAD, len);
 597                                         bp += len;
 598                                         len = 0;
 599                                         break;
 600                                 }
 601                                 tag = *bp++;
 602                                 --len;
 603                                 fputs(tok2str(oo2str, NULL, tag), stdout);
 604                                 break;
 605
 606                         case TAG_CLIENT_FQDN:
 607                                 /* this option should be at least 3 bytes long */
 608                                 if (len < 3)  {
 609                                         printf("ERROR: option %u len %u < 3 bytes",
 610                                             TAG_CLIENT_FQDN, len);
 611                                         bp += len;
 612                                         len = 0;
 613                                         break;
 614                                 }
 615                                 if (*bp)
 616                                         printf("[%s] ", client_fqdn_flags(*bp));
 617                                 bp++;
 618                                 if (*bp || *(bp+1))
 619                                         printf("%u/%u ", *bp, *(bp+1));
 620                                 bp += 2;
 621                                 putchar('"');
 622                                 if (fn_printn(bp, len - 3, snapend)) {
 623                                         putchar('"');
 624                                         goto trunc;
 625                                 }
 626                                 putchar('"');
 627                                 bp += len - 3;
 628                                 len = 0;
 629                                 break;
 630
 631                         case TAG_CLIENT_ID:
 632                             {   int type;
 633
 634                                 /* this option should be at least 1 byte long */
 635                                 if (len < 1)  {
 636                                         printf("ERROR: option %u len %u < 1 bytes",
 637                                             TAG_CLIENT_ID, len);
 638                                         bp += len;
 639                                         len = 0;
 640                                         break;
 641                                 }
 642                                 type = *bp++;
 643                                 len--;
 644                                 if (type == 0) {
 645                                         putchar('"');
 646                                         if (fn_printn(bp, len, snapend)) {
 647                                                 putchar('"');
 648                                                 goto trunc;
 649                                         }
 650                                         putchar('"');
 651                                         bp += len;
 652                                         len = 0;
 653                                         break;
 654                                 } else {
 655                                         printf("%s ", tok2str(arp2str, "hardware-type %u,", type));
 656                                         while (len > 0) {
 657                                                 if (!first)
 658                                                         putchar(':');
 659                                                 printf("%02x", *bp);
 660                                                 ++bp;
 661                                                 --len;
 662                                                 first = 0;
 663                                         }
 664                                 }
 665                                 break;
 666                             }
 667
 668                         case TAG_AGENT_CIRCUIT:
 669                                 while (len >= 2) {
 670                                         subopt = *bp++;
 671                                         suboptlen = *bp++;
 672                                         len -= 2;
 673                                         if (suboptlen > len) {
 674                                                 printf("\n\t      %s SubOption %u, length %u: length goes past end of option",
 675                                                    tok2str(agent_suboption_values, "Unknown", subopt),
 676                                                    subopt,
 677                                                    suboptlen);
 678                                                 bp += len;
 679                                                 len = 0;
 680                                                 break;
 681                                         }
 682                                         printf("\n\t      %s SubOption %u, length %u: ",
 683                                            tok2str(agent_suboption_values, "Unknown", subopt),
 684                                            subopt,
 685                                            suboptlen);
 686                                         switch (subopt) {
 687
 688                                         case AGENT_SUBOPTION_CIRCUIT_ID:
 689                                                 fn_printn(bp, suboptlen, NULL);
 690                                                 break;
 691
 692                                         default:
 693                                                 print_unknown_data(bp, "\n\t\t", suboptlen);
 694                                         }
 695
 696                                         len -= suboptlen;
 697                                         bp += suboptlen;
 698                             }
 699                             break;
 700
 701                         case TAG_CLASSLESS_STATIC_RT:
 702                         {
 703                                 u_int mask_width, significant_octets, i;
 704
 705                                 /* this option should be at least 5 bytes long */
 706                                 if (len < 5)  {
 707                                         printf("ERROR: option %u len %u < 5 bytes",
 708                                             TAG_CLASSLESS_STATIC_RT, len);
 709                                         bp += len;
 710                                         len = 0;
 711                                         break;
 712                                 }
 713                                 while (len > 0) {
 714                                         if (!first)
 715                                                 putchar(',');
 716                                         mask_width = *bp++;
 717                                         len--;
 718                                         /* mask_width <= 32 */
 719                                         if (mask_width > 32) {
 720                                                 printf("[ERROR: Mask width (%d) > 32]",  mask_width);
 721                                                 bp += len;
 722                                                 len = 0;
 723                                                 break;
 724                                         }
 725                                         significant_octets = (mask_width + 7) / 8;
 726                                         /* significant octets + router(4) */
 727                                         if (len < significant_octets + 4) {
 728                                                 printf("[ERROR: Remaining length (%u) < %u bytes]",  len, significant_octets + 4);
 729                                                 bp += len;
 730                                                 len = 0;
 731                                                 break;
 732                                         }
 733                                         putchar('(');
 734                                         if (mask_width == 0)
 735                                                 printf("default");
 736                                         else {
 737                                                 for (i = 0; i < significant_octets ; i++) {
 738                                                         if (i > 0)
 739                                                                 putchar('.');
 740                                                         printf("%d", *bp++);
 741                                                 }
 742                                                 for (i = significant_octets ; i < 4 ; i++)
 743                                                         printf(".0");
 744                                                 printf("/%d", mask_width);
 745                                         }
 746                                         memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 747                                         printf(":%s)", ipaddr_string(&ul));
 748                                         bp += sizeof(ul);
 749                                         len -= (significant_octets + 4);
 750                                         first = 0;
 751                                 }
 752                         }
 753                         break;
 754
 755                         default:
 756                                 printf("[unknown special tag %u, size %u]",
 757                                     tag, len);
 758                                 bp += len;
 759                                 len = 0;
 760                                 break;
 761                         }
 762                         break;
 763                 }
 764                 /* Data left over? */
 765                 if (len) {
 766                         printf("\n\t  trailing data length %u", len);
 767                         bp += len;
 768                 }
 769         }
 770         return;
 771 trunc:
 772         printf("|[rfc1048]");
 773 }
 774
 775 static void
 776 cmu_print(register const u_char *bp)
 777 {
 778         register const struct cmu_vend *cmu;
 779
 780 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
 781     if (cmu->m.s_addr != 0) \
 782         printf(" %s:%s", s, ipaddr_string(&cmu->m.s_addr)); }
 783
 784         printf(" vend-cmu");
 785         cmu = (const struct cmu_vend *)bp;
 786
 787         /* Only print if there are unknown bits */
 788         TCHECK(cmu->v_flags);
 789         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
 790                 printf(" F:0x%x", cmu->v_flags);
 791         PRINTCMUADDR(v_dgate, "DG");
 792         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
 793         PRINTCMUADDR(v_dns1, "NS1");
 794         PRINTCMUADDR(v_dns2, "NS2");
 795         PRINTCMUADDR(v_ins1, "IEN1");
 796         PRINTCMUADDR(v_ins2, "IEN2");
 797         PRINTCMUADDR(v_ts1, "TS1");
 798         PRINTCMUADDR(v_ts2, "TS2");
 799         return;
 800
 801 trunc:
 802         fputs(tstr, stdout);
 803 #undef PRINTCMUADDR
 804 }
 805
 806 static char *
 807 client_fqdn_flags(u_int flags)
 808 {
 809         static char buf[8+1];
 810         int i = 0;
 811
 812         if (flags & CLIENT_FQDN_FLAGS_S)
 813                 buf[i++] = 'S';
 814         if (flags & CLIENT_FQDN_FLAGS_O)
 815                 buf[i++] = 'O';
 816         if (flags & CLIENT_FQDN_FLAGS_E)
 817                 buf[i++] = 'E';
 818         if (flags & CLIENT_FQDN_FLAGS_N)
 819                 buf[i++] = 'N';
 820         buf[i] = '\0';
 821
 822         return buf;
 823 }