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
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <tcpdump-stdinc.h>
  29
  30 #include <stdio.h>
  31 #include <string.h>
  32
  33 #include "interface.h"
  34 #include "addrtoname.h"
  35 #include "extract.h"
  36 #include "ether.h"
  37 #include "bootp.h"
  38
  39 static const char tstr[] = " [|bootp]";
  40
  41 static void rfc1048_print(const u_char *);
  42 static void cmu_print(const u_char *);
  43 static char *client_fqdn_flags(u_int flags);
  44
  45 static const struct tok bootp_flag_values[] = {
  46     { 0x8000,                   "Broadcast" },
  47     { 0, NULL}
  48 };
  49
  50 static const struct tok bootp_op_values[] = {
  51     { BOOTPREQUEST,             "Request" },
  52     { BOOTPREPLY,               "Reply" },
  53     { 0, NULL}
  54 };
  55
  56 /*
  57  * Print bootp requests
  58  */
  59 void
  60 bootp_print(register const u_char *cp, u_int length)
  61 {
  62         register const struct bootp *bp;
  63         static const u_char vm_cmu[4] = VM_CMU;
  64         static const u_char vm_rfc1048[4] = VM_RFC1048;
  65
  66         bp = (const struct bootp *)cp;
  67         TCHECK(bp->bp_op);
  68
  69         printf("BOOTP/DHCP, %s",
  70                tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op));
  71
  72         if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
  73                 TCHECK2(bp->bp_chaddr[0], 6);
  74                 printf(" from %s", etheraddr_string(bp->bp_chaddr));
  75         }
  76
  77         printf(", length %u", length);
  78
  79         if (!vflag)
  80             return;
  81
  82         TCHECK(bp->bp_secs);
  83
  84         /* The usual hardware address type is 1 (10Mb Ethernet) */
  85         if (bp->bp_htype != 1)
  86                 printf(", htype %d", bp->bp_htype);
  87
  88         /* The usual length for 10Mb Ethernet address is 6 bytes */
  89         if (bp->bp_htype != 1 || bp->bp_hlen != 6)
  90                 printf(", hlen %d", bp->bp_hlen);
  91
  92         /* Only print interesting fields */
  93         if (bp->bp_hops)
  94                 printf(", hops %d", bp->bp_hops);
  95         if (bp->bp_xid)
  96                 printf(", xid 0x%x", EXTRACT_32BITS(&bp->bp_xid));
  97         if (bp->bp_secs)
  98                 printf(", secs %d", EXTRACT_16BITS(&bp->bp_secs));
  99
 100         printf(", Flags [%s]",
 101                 bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags)));
 102         if (vflag > 1)
 103                 printf(" (0x%04x)", EXTRACT_16BITS(&bp->bp_flags));
 104
 105         /* Client's ip address */
 106         TCHECK(bp->bp_ciaddr);
 107         if (bp->bp_ciaddr.s_addr)
 108                 printf("\n\t  Client-IP %s", ipaddr_string(&bp->bp_ciaddr));
 109
 110         /* 'your' ip address (bootp client) */
 111         TCHECK(bp->bp_yiaddr);
 112         if (bp->bp_yiaddr.s_addr)
 113                 printf("\n\t  Your-IP %s", ipaddr_string(&bp->bp_yiaddr));
 114
 115         /* Server's ip address */
 116         TCHECK(bp->bp_siaddr);
 117         if (bp->bp_siaddr.s_addr)
 118                 printf("\n\t  Server-IP %s", ipaddr_string(&bp->bp_siaddr));
 119
 120         /* Gateway's ip address */
 121         TCHECK(bp->bp_giaddr);
 122         if (bp->bp_giaddr.s_addr)
 123                 printf("\n\t  Gateway-IP %s", ipaddr_string(&bp->bp_giaddr));
 124
 125         /* Client's Ethernet address */
 126         if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
 127                 TCHECK2(bp->bp_chaddr[0], 6);
 128                 printf("\n\t  Client-Ethernet-Address %s", etheraddr_string(bp->bp_chaddr));
 129         }
 130
 131         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 132         if (*bp->bp_sname) {
 133                 printf("\n\t  sname \"");
 134                 if (fn_print(bp->bp_sname, snapend)) {
 135                         putchar('"');
 136                         fputs(tstr + 1, stdout);
 137                         return;
 138                 }
 139                 putchar('"');
 140         }
 141         TCHECK2(bp->bp_file[0], 1);             /* check first char only */
 142         if (*bp->bp_file) {
 143                 printf("\n\t  file \"");
 144                 if (fn_print(bp->bp_file, snapend)) {
 145                         putchar('"');
 146                         fputs(tstr + 1, stdout);
 147                         return;
 148                 }
 149                 putchar('"');
 150         }
 151
 152         /* Decode the vendor buffer */
 153         TCHECK(bp->bp_vend[0]);
 154         if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
 155                  sizeof(u_int32_t)) == 0)
 156                 rfc1048_print(bp->bp_vend);
 157         else if (memcmp((const char *)bp->bp_vend, vm_cmu,
 158                       sizeof(u_int32_t)) == 0)
 159                 cmu_print(bp->bp_vend);
 160         else {
 161                 u_int32_t ul;
 162
 163                 ul = EXTRACT_32BITS(&bp->bp_vend);
 164                 if (ul != 0)
 165                         printf("\n\t  Vendor-#0x%x", ul);
 166         }
 167
 168         return;
 169 trunc:
 170         fputs(tstr, stdout);
 171 }
 172
 173 /*
 174  * The first character specifies the format to print:
 175  *     i - ip address (32 bits)
 176  *     p - ip address pairs (32 bits + 32 bits)
 177  *     l - long (32 bits)
 178  *     L - unsigned long (32 bits)
 179  *     s - short (16 bits)
 180  *     b - period-seperated decimal bytes (variable length)
 181  *     x - colon-seperated hex bytes (variable length)
 182  *     a - ascii string (variable length)
 183  *     B - on/off (8 bits)
 184  *     $ - special (explicit code to handle)
 185  */
 186 static const struct tok tag2str[] = {
 187 /* RFC1048 tags */
 188         { TAG_PAD,              " PAD" },
 189         { TAG_SUBNET_MASK,      "iSubnet-Mask" },       /* subnet mask (RFC950) */
 190         { TAG_TIME_OFFSET,      "LTime-Zone" }, /* seconds from UTC */
 191         { TAG_GATEWAY,          "iDefault-Gateway" },   /* default gateway */
 192         { TAG_TIME_SERVER,      "iTime-Server" },       /* time servers (RFC868) */
 193         { TAG_NAME_SERVER,      "iIEN-Name-Server" },   /* IEN name servers (IEN116) */
 194         { TAG_DOMAIN_SERVER,    "iDomain-Name-Server" },        /* domain name (RFC1035) */
 195         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 196         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 197         { TAG_LPR_SERVER,       "iLPR-Server" },        /* lpr server (RFC1179) */
 198         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 199         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 200         { TAG_HOSTNAME,         "aHostname" },  /* ascii hostname */
 201         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 202         { TAG_END,              " END" },
 203 /* RFC1497 tags */
 204         { TAG_DUMPPATH,         "aDP" },
 205         { TAG_DOMAINNAME,       "aDomain-Name" },
 206         { TAG_SWAP_SERVER,      "iSS" },
 207         { TAG_ROOTPATH,         "aRP" },
 208         { TAG_EXTPATH,          "aEP" },
 209 /* RFC2132 tags */
 210         { TAG_IP_FORWARD,       "BIPF" },
 211         { TAG_NL_SRCRT,         "BSRT" },
 212         { TAG_PFILTERS,         "pPF" },
 213         { TAG_REASS_SIZE,       "sRSZ" },
 214         { TAG_DEF_TTL,          "bTTL" },
 215         { TAG_MTU_TIMEOUT,      "lMTU-Timeout" },
 216         { TAG_MTU_TABLE,        "sMTU-Table" },
 217         { TAG_INT_MTU,          "sMTU" },
 218         { TAG_LOCAL_SUBNETS,    "BLSN" },
 219         { TAG_BROAD_ADDR,       "iBR" },
 220         { TAG_DO_MASK_DISC,     "BMD" },
 221         { TAG_SUPPLY_MASK,      "BMS" },
 222         { TAG_DO_RDISC,         "BRouter-Discovery" },
 223         { TAG_RTR_SOL_ADDR,     "iRSA" },
 224         { TAG_STATIC_ROUTE,     "pStatic-Route" },
 225         { TAG_USE_TRAILERS,     "BUT" },
 226         { TAG_ARP_TIMEOUT,      "lAT" },
 227         { TAG_ETH_ENCAP,        "BIE" },
 228         { TAG_TCP_TTL,          "bTT" },
 229         { TAG_TCP_KEEPALIVE,    "lKI" },
 230         { TAG_KEEPALIVE_GO,     "BKG" },
 231         { TAG_NIS_DOMAIN,       "aYD" },
 232         { TAG_NIS_SERVERS,      "iYS" },
 233         { TAG_NTP_SERVERS,      "iNTP" },
 234         { TAG_VENDOR_OPTS,      "bVendor-Option" },
 235         { TAG_NETBIOS_NS,       "iNetbios-Name-Server" },
 236         { TAG_NETBIOS_DDS,      "iWDD" },
 237         { TAG_NETBIOS_NODE,     "$Netbios-Node" },
 238         { TAG_NETBIOS_SCOPE,    "aNetbios-Scope" },
 239         { TAG_XWIN_FS,          "iXFS" },
 240         { TAG_XWIN_DM,          "iXDM" },
 241         { TAG_NIS_P_DOMAIN,     "sN+D" },
 242         { TAG_NIS_P_SERVERS,    "iN+S" },
 243         { TAG_MOBILE_HOME,      "iMH" },
 244         { TAG_SMPT_SERVER,      "iSMTP" },
 245         { TAG_POP3_SERVER,      "iPOP3" },
 246         { TAG_NNTP_SERVER,      "iNNTP" },
 247         { TAG_WWW_SERVER,       "iWWW" },
 248         { TAG_FINGER_SERVER,    "iFG" },
 249         { TAG_IRC_SERVER,       "iIRC" },
 250         { TAG_STREETTALK_SRVR,  "iSTS" },
 251         { TAG_STREETTALK_STDA,  "iSTDA" },
 252         { TAG_REQUESTED_IP,     "iRequested-IP" },
 253         { TAG_IP_LEASE,         "lLease-Time" },
 254         { TAG_OPT_OVERLOAD,     "$OO" },
 255         { TAG_TFTP_SERVER,      "aTFTP" },
 256         { TAG_BOOTFILENAME,     "aBF" },
 257         { TAG_DHCP_MESSAGE,     " DHCP-Message" },
 258         { TAG_SERVER_ID,        "iServer-ID" },
 259         { TAG_PARM_REQUEST,     "bParameter-Request" },
 260         { TAG_MESSAGE,          "aMSG" },
 261         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 262         { TAG_RENEWAL_TIME,     "lRN" },
 263         { TAG_REBIND_TIME,      "lRB" },
 264         { TAG_VENDOR_CLASS,     "aVendor-Class" },
 265         { TAG_CLIENT_ID,        "$Client-ID" },
 266 /* RFC 2485 */
 267         { TAG_OPEN_GROUP_UAP,   "aUAP" },
 268 /* RFC 2563 */
 269         { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
 270 /* RFC 2610 */
 271         { TAG_SLP_DA,           "bSLP-DA" },    /*"b" is a little wrong */
 272         { TAG_SLP_SCOPE,        "bSLP-SCOPE" }, /*"b" is a little wrong */
 273 /* RFC 2937 */
 274         { TAG_NS_SEARCH,        "sNSSEARCH" },  /* XXX 's' */
 275 /* RFC 3011 */
 276         { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
 277 /* RFC 3442 */
 278         { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" },
 279         { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" },
 280 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
 281         { TAG_USER_CLASS,       "aCLASS" },
 282         { TAG_SLP_NAMING_AUTH,  "aSLP-NA" },
 283         { TAG_CLIENT_FQDN,      "$FQDN" },
 284         { TAG_AGENT_CIRCUIT,    "$Agent-Information" },
 285         { TAG_AGENT_REMOTE,     "bARMT" },
 286         { TAG_AGENT_MASK,       "bAMSK" },
 287         { TAG_TZ_STRING,        "aTZSTR" },
 288         { TAG_FQDN_OPTION,      "bFQDNS" },     /* XXX 'b' */
 289         { TAG_AUTH,             "bAUTH" },      /* XXX 'b' */
 290         { TAG_VINES_SERVERS,    "iVINES" },
 291         { TAG_SERVER_RANK,      "sRANK" },
 292         { TAG_CLIENT_ARCH,      "sARCH" },
 293         { TAG_CLIENT_NDI,       "bNDI" },       /* XXX 'b' */
 294         { TAG_CLIENT_GUID,      "bGUID" },      /* XXX 'b' */
 295         { TAG_LDAP_URL,         "aLDAP" },
 296         { TAG_6OVER4,           "i6o4" },
 297         { TAG_PRINTER_NAME,     "aPRTR" },
 298         { TAG_MDHCP_SERVER,     "bMDHCP" },     /* XXX 'b' */
 299         { TAG_IPX_COMPAT,       "bIPX" },       /* XXX 'b' */
 300         { TAG_NETINFO_PARENT,   "iNI" },
 301         { TAG_NETINFO_PARENT_TAG, "aNITAG" },
 302         { TAG_URL,              "aURL" },
 303         { TAG_FAILOVER,         "bFAIL" },      /* XXX 'b' */
 304         { 0,                    NULL }
 305 };
 306 /* 2-byte extended tags */
 307 static const struct tok xtag2str[] = {
 308         { 0,                    NULL }
 309 };
 310
 311 /* DHCP "options overload" types */
 312 static const struct tok oo2str[] = {
 313         { 1,                    "file" },
 314         { 2,                    "sname" },
 315         { 3,                    "file+sname" },
 316         { 0,                    NULL }
 317 };
 318
 319 /* NETBIOS over TCP/IP node type options */
 320 static const struct tok nbo2str[] = {
 321         { 0x1,                  "b-node" },
 322         { 0x2,                  "p-node" },
 323         { 0x4,                  "m-node" },
 324         { 0x8,                  "h-node" },
 325         { 0,                    NULL }
 326 };
 327
 328 /* ARP Hardware types, for Client-ID option */
 329 static const struct tok arp2str[] = {
 330         { 0x1,                  "ether" },
 331         { 0x6,                  "ieee802" },
 332         { 0x7,                  "arcnet" },
 333         { 0xf,                  "frelay" },
 334         { 0x17,                 "strip" },
 335         { 0x18,                 "ieee1394" },
 336         { 0,                    NULL }
 337 };
 338
 339 static const struct tok dhcp_msg_values[] = {
 340         { DHCPDISCOVER, "Discover" },
 341         { DHCPOFFER, "Offer" },
 342         { DHCPREQUEST, "Request" },
 343         { DHCPDECLINE, "Decline" },
 344         { DHCPACK, "ACK" },
 345         { DHCPNAK, "NACK" },
 346         { DHCPRELEASE, "Release" },
 347         { DHCPINFORM, "Inform" },
 348         { 0,                    NULL }
 349 };
 350
 351 #define AGENT_SUBOPTION_CIRCUIT_ID      1       /* RFC 3046 */
 352 #define AGENT_SUBOPTION_REMOTE_ID       2       /* RFC 3046 */
 353 #define AGENT_SUBOPTION_SUBSCRIBER_ID   6       /* RFC 3993 */
 354 static const struct tok agent_suboption_values[] = {
 355         { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
 356         { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" },
 357         { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" },
 358         { 0,                    NULL }
 359 };
 360
 361
 362 static void
 363 rfc1048_print(register const u_char *bp)
 364 {
 365         register u_int16_t tag;
 366         register u_int len;
 367         register const char *cp;
 368         register char c;
 369         int first, idx;
 370         u_int32_t ul;
 371         u_int16_t us;
 372         u_int8_t uc, subopt, suboptlen;
 373
 374         printf("\n\t  Vendor-rfc1048 Extensions");
 375
 376         /* Step over magic cookie */
 377         printf("\n\t    Magic Cookie 0x%08x", EXTRACT_32BITS(bp));
 378         bp += sizeof(int32_t);
 379
 380         /* Loop while we there is a tag left in the buffer */
 381         while (TTEST2(*bp, 1)) {
 382                 tag = *bp++;
 383                 if (tag == TAG_PAD && vflag < 3)
 384                         continue;
 385                 if (tag == TAG_END && vflag < 3)
 386                         return;
 387                 if (tag == TAG_EXTENDED_OPTION) {
 388                         TCHECK2(*(bp + 1), 2);
 389                         tag = EXTRACT_16BITS(bp + 1);
 390                         /* XXX we don't know yet if the IANA will
 391                          * preclude overlap of 1-byte and 2-byte spaces.
 392                          * If not, we need to offset tag after this step.
 393                          */
 394                         cp = tok2str(xtag2str, "?xT%u", tag);
 395                 } else
 396                         cp = tok2str(tag2str, "?T%u", tag);
 397                 c = *cp++;
 398
 399                 if (tag == TAG_PAD || tag == TAG_END)
 400                         len = 0;
 401                 else {
 402                         /* Get the length; check for truncation */
 403                         TCHECK2(*bp, 1);
 404                         len = *bp++;
 405                 }
 406
 407                 printf("\n\t    %s Option %u, length %u%s", cp, tag, len,
 408                     len > 0 ? ": " : "");
 409
 410                 if (tag == TAG_PAD && vflag > 2) {
 411                         u_int ntag = 1;
 412                         while (TTEST2(*bp, 1) && *bp == TAG_PAD) {
 413                                 bp++;
 414                                 ntag++;
 415                         }
 416                         if (ntag > 1)
 417                                 printf(", occurs %u", ntag);
 418                 }
 419
 420                 if (!TTEST2(*bp, len)) {
 421                         printf("[|rfc1048 %u]", len);
 422                         return;
 423                 }
 424
 425                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 426                         uc = *bp++;
 427                         printf("%s", tok2str(dhcp_msg_values, "Unknown (%u)", uc));
 428                         continue;
 429                 }
 430
 431                 if (tag == TAG_PARM_REQUEST) {
 432                         idx = 0;
 433                         while (len-- > 0) {
 434                                 uc = *bp++;
 435                                 cp = tok2str(tag2str, "?Option %u", uc);
 436                                 if (idx % 4 == 0)
 437                                         printf("\n\t      ");
 438                                 else
 439                                         printf(", ");
 440                                 printf("%s", cp + 1);
 441                                 idx++;
 442                         }
 443                         continue;
 444                 }
 445
 446                 if (tag == TAG_EXTENDED_REQUEST) {
 447                         first = 1;
 448                         while (len > 1) {
 449                                 len -= 2;
 450                                 us = EXTRACT_16BITS(bp);
 451                                 bp += 2;
 452                                 cp = tok2str(xtag2str, "?xT%u", us);
 453                                 if (!first)
 454                                         putchar('+');
 455                                 printf("%s", cp + 1);
 456                                 first = 0;
 457                         }
 458                         continue;
 459                 }
 460
 461                 /* Print data */
 462                 if (c == '?') {
 463                         /* Base default formats for unknown tags on data size */
 464                         if (len & 1)
 465                                 c = 'b';
 466                         else if (len & 2)
 467                                 c = 's';
 468                         else
 469                                 c = 'l';
 470                 }
 471                 first = 1;
 472                 switch (c) {
 473
 474                 case 'a':
 475                         /* ascii strings */
 476                         putchar('"');
 477                         if (fn_printn(bp, len, snapend)) {
 478                                 putchar('"');
 479                                 goto trunc;
 480                         }
 481                         putchar('"');
 482                         bp += len;
 483                         len = 0;
 484                         break;
 485
 486                 case 'i':
 487                 case 'l':
 488                 case 'L':
 489                         /* ip addresses/32-bit words */
 490                         while (len >= sizeof(ul)) {
 491                                 if (!first)
 492                                         putchar(',');
 493                                 ul = EXTRACT_32BITS(bp);
 494                                 if (c == 'i') {
 495                                         ul = htonl(ul);
 496                                         printf("%s", ipaddr_string(&ul));
 497                                 } else if (c == 'L')
 498                                         printf("%d", ul);
 499                                 else
 500                                         printf("%u", ul);
 501                                 bp += sizeof(ul);
 502                                 len -= sizeof(ul);
 503                                 first = 0;
 504                         }
 505                         break;
 506
 507                 case 'p':
 508                         /* IP address pairs */
 509                         while (len >= 2*sizeof(ul)) {
 510                                 if (!first)
 511                                         putchar(',');
 512                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 513                                 printf("(%s:", ipaddr_string(&ul));
 514                                 bp += sizeof(ul);
 515                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 516                                 printf("%s)", ipaddr_string(&ul));
 517                                 bp += sizeof(ul);
 518                                 len -= 2*sizeof(ul);
 519                                 first = 0;
 520                         }
 521                         break;
 522
 523                 case 's':
 524                         /* shorts */
 525                         while (len >= sizeof(us)) {
 526                                 if (!first)
 527                                         putchar(',');
 528                                 us = EXTRACT_16BITS(bp);
 529                                 printf("%u", us);
 530                                 bp += sizeof(us);
 531                                 len -= sizeof(us);
 532                                 first = 0;
 533                         }
 534                         break;
 535
 536                 case 'B':
 537                         /* boolean */
 538                         while (len > 0) {
 539                                 if (!first)
 540                                         putchar(',');
 541                                 switch (*bp) {
 542                                 case 0:
 543                                         putchar('N');
 544                                         break;
 545                                 case 1:
 546                                         putchar('Y');
 547                                         break;
 548                                 default:
 549                                         printf("%u?", *bp);
 550                                         break;
 551                                 }
 552                                 ++bp;
 553                                 --len;
 554                                 first = 0;
 555                         }
 556                         break;
 557
 558                 case 'b':
 559                 case 'x':
 560                 default:
 561                         /* Bytes */
 562                         while (len > 0) {
 563                                 if (!first)
 564                                         putchar(c == 'x' ? ':' : '.');
 565                                 if (c == 'x')
 566                                         printf("%02x", *bp);
 567                                 else
 568                                         printf("%u", *bp);
 569                                 ++bp;
 570                                 --len;
 571                                 first = 0;
 572                         }
 573                         break;
 574
 575                 case '$':
 576                         /* Guys we can't handle with one of the usual cases */
 577                         switch (tag) {
 578
 579                         case TAG_NETBIOS_NODE:
 580                                 /* this option should be at least 1 byte long */
 581                                 if (len < 1)  {
 582                                         printf("ERROR: option %u len %u < 1 bytes",
 583                                             TAG_NETBIOS_NODE, len);
 584                                         break;
 585                                 }
 586                                 tag = *bp++;
 587                                 --len;
 588                                 fputs(tok2str(nbo2str, NULL, tag), stdout);
 589                                 break;
 590
 591                         case TAG_OPT_OVERLOAD:
 592                                 /* this option should be at least 1 byte long */
 593                                 if (len < 1)  {
 594                                         printf("ERROR: option %u len %u < 1 bytes",
 595                                             TAG_OPT_OVERLOAD, len);
 596                                         break;
 597                                 }
 598                                 tag = *bp++;
 599                                 --len;
 600                                 fputs(tok2str(oo2str, NULL, tag), stdout);
 601                                 break;
 602
 603                         case TAG_CLIENT_FQDN:
 604                                 /* this option should be at least 3 bytes long */
 605                                 if (len < 3)  {
 606                                         printf("ERROR: option %u len %u < 3 bytes",
 607                                             TAG_CLIENT_FQDN, len);
 608                                         bp += len;
 609                                         len = 0;
 610                                         break;
 611                                 }
 612                                 if (*bp)
 613                                         printf("[%s] ", client_fqdn_flags(*bp));
 614                                 bp++;
 615                                 if (*bp || *(bp+1))
 616                                         printf("%u/%u ", *bp, *(bp+1));
 617                                 bp += 2;
 618                                 putchar('"');
 619                                 if (fn_printn(bp, len - 3, snapend)) {
 620                                         putchar('"');
 621                                         goto trunc;
 622                                 }
 623                                 putchar('"');
 624                                 bp += len - 3;
 625                                 len = 0;
 626                                 break;
 627
 628                         case TAG_CLIENT_ID:
 629                             {   int type;
 630
 631                                 /* this option should be at least 1 byte long */
 632                                 if (len < 1)  {
 633                                         printf("ERROR: option %u len %u < 1 bytes",
 634                                             TAG_CLIENT_ID, len);
 635                                         break;
 636                                 }
 637                                 type = *bp++;
 638                                 len--;
 639                                 if (type == 0) {
 640                                         putchar('"');
 641                                         if (fn_printn(bp, len, snapend)) {
 642                                                 putchar('"');
 643                                                 goto trunc;
 644                                         }
 645                                         putchar('"');
 646                                         bp += len;
 647                                         len = 0;
 648                                         break;
 649                                 } else {
 650                                         printf("%s ", tok2str(arp2str, "hardware-type %u,", type));
 651                                         while (len > 0) {
 652                                                 if (!first)
 653                                                         putchar(':');
 654                                                 printf("%02x", *bp);
 655                                                 ++bp;
 656                                                 --len;
 657                                                 first = 0;
 658                                         }
 659                                 }
 660                                 break;
 661                             }
 662
 663                         case TAG_AGENT_CIRCUIT:
 664                                 while (len >= 2) {
 665                                         subopt = *bp++;
 666                                         suboptlen = *bp++;
 667                                         len -= 2;
 668                                         if (suboptlen > len) {
 669                                                 printf("\n\t      %s SubOption %u, length %u: length goes past end of option",
 670                                                    tok2str(agent_suboption_values, "Unknown", subopt),
 671                                                    subopt,
 672                                                    suboptlen);
 673                                                 bp += len;
 674                                                 len = 0;
 675                                                 break;
 676                                         }
 677                                         printf("\n\t      %s SubOption %u, length %u: ",
 678                                            tok2str(agent_suboption_values, "Unknown", subopt),
 679                                            subopt,
 680                                            suboptlen);
 681                                         switch (subopt) {
 682
 683                                         case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */
 684                                         case AGENT_SUBOPTION_REMOTE_ID:
 685                                         case AGENT_SUBOPTION_SUBSCRIBER_ID:
 686                                                 fn_printn(bp, suboptlen, NULL);
 687                                                 break;
 688
 689                                         default:
 690                                                 print_unknown_data(gndo,bp, "\n\t\t", suboptlen);
 691                                         }
 692
 693                                         len -= suboptlen;
 694                                         bp += suboptlen;
 695                             }
 696                             break;
 697
 698                         case TAG_CLASSLESS_STATIC_RT:
 699                         case TAG_CLASSLESS_STA_RT_MS:
 700                         {
 701                                 u_int mask_width, significant_octets, i;
 702
 703                                 /* this option should be at least 5 bytes long */
 704                                 if (len < 5)  {
 705                                         printf("ERROR: option %u len %u < 5 bytes",
 706                                             TAG_CLASSLESS_STATIC_RT, len);
 707                                         bp += len;
 708                                         len = 0;
 709                                         break;
 710                                 }
 711                                 while (len > 0) {
 712                                         if (!first)
 713                                                 putchar(',');
 714                                         mask_width = *bp++;
 715                                         len--;
 716                                         /* mask_width <= 32 */
 717                                         if (mask_width > 32) {
 718                                                 printf("[ERROR: Mask width (%d) > 32]",  mask_width);
 719                                                 bp += len;
 720                                                 len = 0;
 721                                                 break;
 722                                         }
 723                                         significant_octets = (mask_width + 7) / 8;
 724                                         /* significant octets + router(4) */
 725                                         if (len < significant_octets + 4) {
 726                                                 printf("[ERROR: Remaining length (%u) < %u bytes]",  len, significant_octets + 4);
 727                                                 bp += len;
 728                                                 len = 0;
 729                                                 break;
 730                                         }
 731                                         putchar('(');
 732                                         if (mask_width == 0)
 733                                                 printf("default");
 734                                         else {
 735                                                 for (i = 0; i < significant_octets ; i++) {
 736                                                         if (i > 0)
 737                                                                 putchar('.');
 738                                                         printf("%d", *bp++);
 739                                                 }
 740                                                 for (i = significant_octets ; i < 4 ; i++)
 741                                                         printf(".0");
 742                                                 printf("/%d", mask_width);
 743                                         }
 744                                         memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 745                                         printf(":%s)", ipaddr_string(&ul));
 746                                         bp += sizeof(ul);
 747                                         len -= (significant_octets + 4);
 748                                         first = 0;
 749                                 }
 750                         }
 751                         break;
 752
 753                         default:
 754                                 printf("[unknown special tag %u, size %u]",
 755                                     tag, len);
 756                                 bp += len;
 757                                 len = 0;
 758                                 break;
 759                         }
 760                         break;
 761                 }
 762                 /* Data left over? */
 763                 if (len) {
 764                         printf("\n\t  trailing data length %u", len);
 765                         bp += len;
 766                 }
 767         }
 768         return;
 769 trunc:
 770         printf("|[rfc1048]");
 771 }
 772
 773 static void
 774 cmu_print(register const u_char *bp)
 775 {
 776         register const struct cmu_vend *cmu;
 777
 778 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
 779     if (cmu->m.s_addr != 0) \
 780         printf(" %s:%s", s, ipaddr_string(&cmu->m.s_addr)); }
 781
 782         printf(" vend-cmu");
 783         cmu = (const struct cmu_vend *)bp;
 784
 785         /* Only print if there are unknown bits */
 786         TCHECK(cmu->v_flags);
 787         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
 788                 printf(" F:0x%x", cmu->v_flags);
 789         PRINTCMUADDR(v_dgate, "DG");
 790         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
 791         PRINTCMUADDR(v_dns1, "NS1");
 792         PRINTCMUADDR(v_dns2, "NS2");
 793         PRINTCMUADDR(v_ins1, "IEN1");
 794         PRINTCMUADDR(v_ins2, "IEN2");
 795         PRINTCMUADDR(v_ts1, "TS1");
 796         PRINTCMUADDR(v_ts2, "TS2");
 797         return;
 798
 799 trunc:
 800         fputs(tstr, stdout);
 801 #undef PRINTCMUADDR
 802 }
 803
 804 static char *
 805 client_fqdn_flags(u_int flags)
 806 {
 807         static char buf[8+1];
 808         int i = 0;
 809
 810         if (flags & CLIENT_FQDN_FLAGS_S)
 811                 buf[i++] = 'S';
 812         if (flags & CLIENT_FQDN_FLAGS_O)
 813                 buf[i++] = 'O';
 814         if (flags & CLIENT_FQDN_FLAGS_E)
 815                 buf[i++] = 'E';
 816         if (flags & CLIENT_FQDN_FLAGS_N)
 817                 buf[i++] = 'N';
 818         buf[i] = '\0';
 819
 820         return buf;
 821 }