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 1.78.2.4 2007-01-14 21:23:31 guy Exp $ (LBL)";
  26 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <tcpdump-stdinc.h>
  33
  34 #include <stdio.h>
  35 #include <string.h>
  36
  37 #include "interface.h"
  38 #include "addrtoname.h"
  39 #include "extract.h"
  40 #include "ether.h"
  41 #include "bootp.h"
  42
  43 static void rfc1048_print(const u_char *);
  44 static void cmu_print(const u_char *);
  45
  46 static char tstr[] = " [|bootp]";
  47
  48 static const struct tok bootp_flag_values[] = {
  49     { 0x8000,                   "Broadcast" },
  50     { 0, NULL}
  51 };
  52
  53 static const struct tok bootp_op_values[] = {
  54     { BOOTPREQUEST,             "Request" },
  55     { BOOTPREPLY,               "Reply" },
  56     { 0, NULL}
  57 };
  58
  59 /*
  60  * Print bootp requests
  61  */
  62 void
  63 bootp_print(register const u_char *cp, u_int length)
  64 {
  65         register const struct bootp *bp;
  66         static const u_char vm_cmu[4] = VM_CMU;
  67         static const u_char vm_rfc1048[4] = VM_RFC1048;
  68
  69         bp = (const struct bootp *)cp;
  70         TCHECK(bp->bp_op);
  71
  72         printf("BOOTP/DHCP, %s",
  73                tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op));
  74
  75         if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
  76                 TCHECK2(bp->bp_chaddr[0], 6);
  77                 printf(" from %s", etheraddr_string(bp->bp_chaddr));
  78         }
  79
  80         printf(", length %u", length);
  81
  82         if (!vflag)
  83             return;
  84
  85         TCHECK(bp->bp_secs);
  86
  87         /* The usual hardware address type is 1 (10Mb Ethernet) */
  88         if (bp->bp_htype != 1)
  89                 printf(", htype %d", bp->bp_htype);
  90
  91         /* The usual length for 10Mb Ethernet address is 6 bytes */
  92         if (bp->bp_htype != 1 || bp->bp_hlen != 6)
  93                 printf(", hlen %d", bp->bp_hlen);
  94
  95         /* Only print interesting fields */
  96         if (bp->bp_hops)
  97                 printf(", hops %d", bp->bp_hops);
  98         if (bp->bp_xid)
  99                 printf(", xid 0x%x", EXTRACT_32BITS(&bp->bp_xid));
 100         if (bp->bp_secs)
 101                 printf(", secs %d", EXTRACT_16BITS(&bp->bp_secs));
 102
 103         printf(", Flags [ %s ]",
 104                bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags)));
 105         if (vflag>1)
 106           printf( " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags));
 107
 108         /* Client's ip address */
 109         TCHECK(bp->bp_ciaddr);
 110         if (bp->bp_ciaddr.s_addr)
 111                 printf("\n\t  Client-IP %s", ipaddr_string(&bp->bp_ciaddr));
 112
 113         /* 'your' ip address (bootp client) */
 114         TCHECK(bp->bp_yiaddr);
 115         if (bp->bp_yiaddr.s_addr)
 116                 printf("\n\t  Your-IP %s", ipaddr_string(&bp->bp_yiaddr));
 117
 118         /* Server's ip address */
 119         TCHECK(bp->bp_siaddr);
 120         if (bp->bp_siaddr.s_addr)
 121                 printf("\n\t  Server-IP %s", ipaddr_string(&bp->bp_siaddr));
 122
 123         /* Gateway's ip address */
 124         TCHECK(bp->bp_giaddr);
 125         if (bp->bp_giaddr.s_addr)
 126                 printf("\n\t  Gateway-IP %s", ipaddr_string(&bp->bp_giaddr));
 127
 128         /* Client's Ethernet address */
 129         if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
 130                 TCHECK2(bp->bp_chaddr[0], 6);
 131                 printf("\n\t  Client-Ethernet-Address %s", etheraddr_string(bp->bp_chaddr));
 132         }
 133
 134         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 135         if (*bp->bp_sname) {
 136                 printf("\n\t  sname \"");
 137                 if (fn_print(bp->bp_sname, snapend)) {
 138                         putchar('"');
 139                         fputs(tstr + 1, stdout);
 140                         return;
 141                 }
 142                 putchar('"');
 143         }
 144         TCHECK2(bp->bp_file[0], 1);             /* check first char only */
 145         if (*bp->bp_file) {
 146                 printf("\n\t  file \"");
 147                 if (fn_print(bp->bp_file, snapend)) {
 148                         putchar('"');
 149                         fputs(tstr + 1, stdout);
 150                         return;
 151                 }
 152                 putchar('"');
 153         }
 154
 155         /* Decode the vendor buffer */
 156         TCHECK(bp->bp_vend[0]);
 157         if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
 158                  sizeof(u_int32_t)) == 0)
 159                 rfc1048_print(bp->bp_vend);
 160         else if (memcmp((const char *)bp->bp_vend, vm_cmu,
 161                       sizeof(u_int32_t)) == 0)
 162                 cmu_print(bp->bp_vend);
 163         else {
 164                 u_int32_t ul;
 165
 166                 ul = EXTRACT_32BITS(&bp->bp_vend);
 167                 if (ul != 0)
 168                         printf("\n\t  Vendor-#0x%x", ul);
 169         }
 170
 171         return;
 172 trunc:
 173         fputs(tstr, stdout);
 174 }
 175
 176 /*
 177  * The first character specifies the format to print:
 178  *     i - ip address (32 bits)
 179  *     p - ip address pairs (32 bits + 32 bits)
 180  *     l - long (32 bits)
 181  *     L - unsigned long (32 bits)
 182  *     s - short (16 bits)
 183  *     b - period-seperated decimal bytes (variable length)
 184  *     x - colon-seperated hex bytes (variable length)
 185  *     a - ascii string (variable length)
 186  *     B - on/off (8 bits)
 187  *     $ - special (explicit code to handle)
 188  */
 189 static struct tok tag2str[] = {
 190 /* RFC1048 tags */
 191         { TAG_PAD,              " PAD" },
 192         { TAG_SUBNET_MASK,      "iSubnet-Mask" },       /* subnet mask (RFC950) */
 193         { TAG_TIME_OFFSET,      "LTime-Zone" }, /* seconds from UTC */
 194         { TAG_GATEWAY,          "iDefault-Gateway" },   /* default gateway */
 195         { TAG_TIME_SERVER,      "iTime-Server" },       /* time servers (RFC868) */
 196         { TAG_NAME_SERVER,      "iIEN-Name-Server" },   /* IEN name servers (IEN116) */
 197         { TAG_DOMAIN_SERVER,    "iDomain-Name-Server" },        /* domain name (RFC1035) */
 198         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 199         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 200         { TAG_LPR_SERVER,       "iLPR-Server" },        /* lpr server (RFC1179) */
 201         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 202         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 203         { TAG_HOSTNAME,         "aHostname" },  /* ascii hostname */
 204         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 205         { TAG_END,              " END" },
 206 /* RFC1497 tags */
 207         { TAG_DUMPPATH,         "aDP" },
 208         { TAG_DOMAINNAME,       "aDomain-Name" },
 209         { TAG_SWAP_SERVER,      "iSS" },
 210         { TAG_ROOTPATH,         "aRP" },
 211         { TAG_EXTPATH,          "aEP" },
 212 /* RFC2132 tags */
 213         { TAG_IP_FORWARD,       "BIPF" },
 214         { TAG_NL_SRCRT,         "BSRT" },
 215         { TAG_PFILTERS,         "pPF" },
 216         { TAG_REASS_SIZE,       "sRSZ" },
 217         { TAG_DEF_TTL,          "bTTL" },
 218         { TAG_MTU_TIMEOUT,      "lMTU-Timeout" },
 219         { TAG_MTU_TABLE,        "sMTU-Table" },
 220         { TAG_INT_MTU,          "sMTU" },
 221         { TAG_LOCAL_SUBNETS,    "BLSN" },
 222         { TAG_BROAD_ADDR,       "iBR" },
 223         { TAG_DO_MASK_DISC,     "BMD" },
 224         { TAG_SUPPLY_MASK,      "BMS" },
 225         { TAG_DO_RDISC,         "BRouter-Discovery" },
 226         { TAG_RTR_SOL_ADDR,     "iRSA" },
 227         { TAG_STATIC_ROUTE,     "pStatic-Route" },
 228         { TAG_USE_TRAILERS,     "BUT" },
 229         { TAG_ARP_TIMEOUT,      "lAT" },
 230         { TAG_ETH_ENCAP,        "BIE" },
 231         { TAG_TCP_TTL,          "bTT" },
 232         { TAG_TCP_KEEPALIVE,    "lKI" },
 233         { TAG_KEEPALIVE_GO,     "BKG" },
 234         { TAG_NIS_DOMAIN,       "aYD" },
 235         { TAG_NIS_SERVERS,      "iYS" },
 236         { TAG_NTP_SERVERS,      "iNTP" },
 237         { TAG_VENDOR_OPTS,      "bVendor-Option" },
 238         { TAG_NETBIOS_NS,       "iNetbios-Name-Server" },
 239         { TAG_NETBIOS_DDS,      "iWDD" },
 240         { TAG_NETBIOS_NODE,     "$Netbios-Node" },
 241         { TAG_NETBIOS_SCOPE,    "aNetbios-Scope" },
 242         { TAG_XWIN_FS,          "iXFS" },
 243         { TAG_XWIN_DM,          "iXDM" },
 244         { TAG_NIS_P_DOMAIN,     "sN+D" },
 245         { TAG_NIS_P_SERVERS,    "iN+S" },
 246         { TAG_MOBILE_HOME,      "iMH" },
 247         { TAG_SMPT_SERVER,      "iSMTP" },
 248         { TAG_POP3_SERVER,      "iPOP3" },
 249         { TAG_NNTP_SERVER,      "iNNTP" },
 250         { TAG_WWW_SERVER,       "iWWW" },
 251         { TAG_FINGER_SERVER,    "iFG" },
 252         { TAG_IRC_SERVER,       "iIRC" },
 253         { TAG_STREETTALK_SRVR,  "iSTS" },
 254         { TAG_STREETTALK_STDA,  "iSTDA" },
 255         { TAG_REQUESTED_IP,     "iRequested-IP" },
 256         { TAG_IP_LEASE,         "lLease-Time" },
 257         { TAG_OPT_OVERLOAD,     "$OO" },
 258         { TAG_TFTP_SERVER,      "aTFTP" },
 259         { TAG_BOOTFILENAME,     "aBF" },
 260         { TAG_DHCP_MESSAGE,     " DHCP-Message" },
 261         { TAG_SERVER_ID,        "iServer-ID" },
 262         { TAG_PARM_REQUEST,     "bParameter-Request" },
 263         { TAG_MESSAGE,          "aMSG" },
 264         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 265         { TAG_RENEWAL_TIME,     "lRN" },
 266         { TAG_REBIND_TIME,      "lRB" },
 267         { TAG_VENDOR_CLASS,     "aVendor-Class" },
 268         { TAG_CLIENT_ID,        "$Client-ID" },
 269 /* RFC 2485 */
 270         { TAG_OPEN_GROUP_UAP,   "aUAP" },
 271 /* RFC 2563 */
 272         { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
 273 /* RFC 2610 */
 274         { TAG_SLP_DA,           "bSLP-DA" },    /*"b" is a little wrong */
 275         { TAG_SLP_SCOPE,        "bSLP-SCOPE" }, /*"b" is a little wrong */
 276 /* RFC 2937 */
 277         { TAG_NS_SEARCH,        "sNSSEARCH" },  /* XXX 's' */
 278 /* RFC 3011 */
 279         { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
 280 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
 281         { TAG_USER_CLASS,       "aCLASS" },
 282         { TAG_SLP_NAMING_AUTH,  "aSLP-NA" },
 283         { TAG_CLIENT_FQDN,      "$FQDN" },
 284         { TAG_AGENT_CIRCUIT,    "$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 struct tok xtag2str[] = {
 308         { 0,                    NULL }
 309 };
 310
 311 /* DHCP "options overload" types */
 312 static struct tok oo2str[] = {
 313         { 1,                    "file" },
 314         { 2,                    "sname" },
 315         { 3,                    "file+sname" },
 316         { 0,                    NULL }
 317 };
 318
 319 /* NETBIOS over TCP/IP node type options */
 320 static struct tok nbo2str[] = {
 321         { 0x1,                  "b-node" },
 322         { 0x2,                  "p-node" },
 323         { 0x4,                  "m-node" },
 324         { 0x8,                  "h-node" },
 325         { 0,                    NULL }
 326 };
 327
 328 /* ARP Hardware types, for Client-ID option */
 329 static struct tok arp2str[] = {
 330         { 0x1,                  "ether" },
 331         { 0x6,                  "ieee802" },
 332         { 0x7,                  "arcnet" },
 333         { 0xf,                  "frelay" },
 334         { 0x17,                 "strip" },
 335         { 0x18,                 "ieee1394" },
 336         { 0,                    NULL }
 337 };
 338
 339 static 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
 352 static struct tok agent_suboption_values[] = {
 353         { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
 354         { 0,                    NULL }
 355 };
 356
 357
 358 static void
 359 rfc1048_print(register const u_char *bp)
 360 {
 361         register u_int16_t tag;
 362         register u_int len, size;
 363         register const char *cp;
 364         register char c;
 365         int first, idx;
 366         u_int32_t ul;
 367         u_int16_t us;
 368         u_int8_t uc, subopt, suboptlen;
 369
 370         printf("\n\t  Vendor-rfc1048 Extensions");
 371
 372         /* Step over magic cookie */
 373         printf("\n\t    Magic Cookie 0x%08x", EXTRACT_32BITS(bp));
 374         bp += sizeof(int32_t);
 375
 376         /* Loop while we there is a tag left in the buffer */
 377         while (bp + 1 < snapend) {
 378                 tag = *bp++;
 379                 if (tag == TAG_PAD)
 380                         continue;
 381                 if (tag == TAG_END)
 382                         return;
 383                 if (tag == TAG_EXTENDED_OPTION) {
 384                         TCHECK2(*(bp + 1), 2);
 385                         tag = EXTRACT_16BITS(bp + 1);
 386                         /* XXX we don't know yet if the IANA will
 387                          * preclude overlap of 1-byte and 2-byte spaces.
 388                          * If not, we need to offset tag after this step.
 389                          */
 390                         cp = tok2str(xtag2str, "?xT%u", tag);
 391                 } else
 392                         cp = tok2str(tag2str, "?T%u", tag);
 393                 c = *cp++;
 394
 395                 /* Get the length; check for truncation */
 396                 if (bp + 1 >= snapend) {
 397                         fputs(tstr, stdout);
 398                         return;
 399                 }
 400                 len = *bp++;
 401
 402                 printf("\n\t    %s Option %u, length %u: ", cp, tag, len);
 403
 404                 if (bp + len >= snapend) {
 405                         printf("[|bootp %u]", len);
 406                         return;
 407                 }
 408
 409                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 410                         uc = *bp++;
 411                         printf("%s", tok2str(dhcp_msg_values, "Unknown (%u)", uc));
 412                         continue;
 413                 }
 414
 415                 if (tag == TAG_PARM_REQUEST) {
 416                         idx = 0;
 417                         while (len-- > 0) {
 418                                 uc = *bp++;
 419                                 cp = tok2str(tag2str, "?Option %u", uc);
 420                                 if (idx % 4 == 0)
 421                                         printf("\n\t      ");
 422                                 else
 423                                         printf(", ");
 424                                 printf("%s", cp + 1);
 425                                 idx++;
 426                         }
 427                         continue;
 428                 }
 429
 430                 if (tag == TAG_EXTENDED_REQUEST) {
 431                         first = 1;
 432                         while (len > 1) {
 433                                 len -= 2;
 434                                 us = EXTRACT_16BITS(bp);
 435                                 bp += 2;
 436                                 cp = tok2str(xtag2str, "?xT%u", us);
 437                                 if (!first)
 438                                         putchar('+');
 439                                 printf("%s", cp + 1);
 440                                 first = 0;
 441                         }
 442                         continue;
 443                 }
 444
 445                 /* Print data */
 446                 size = len;
 447                 if (c == '?') {
 448                         /* Base default formats for unknown tags on data size */
 449                         if (size & 1)
 450                                 c = 'b';
 451                         else if (size & 2)
 452                                 c = 's';
 453                         else
 454                                 c = 'l';
 455                 }
 456                 first = 1;
 457                 switch (c) {
 458
 459                 case 'a':
 460                         /* ascii strings */
 461                         putchar('"');
 462                         if (fn_printn(bp, size, snapend)) {
 463                                 putchar('"');
 464                                 goto trunc;
 465                         }
 466                         putchar('"');
 467                         bp += size;
 468                         size = 0;
 469                         break;
 470
 471                 case 'i':
 472                 case 'l':
 473                 case 'L':
 474                         /* ip addresses/32-bit words */
 475                         while (size >= sizeof(ul)) {
 476                                 if (!first)
 477                                         putchar(',');
 478                                 ul = EXTRACT_32BITS(bp);
 479                                 if (c == 'i') {
 480                                         ul = htonl(ul);
 481                                         printf("%s", ipaddr_string(&ul));
 482                                 } else if (c == 'L')
 483                                         printf("%d", ul);
 484                                 else
 485                                         printf("%u", ul);
 486                                 bp += sizeof(ul);
 487                                 size -= sizeof(ul);
 488                                 first = 0;
 489                         }
 490                         break;
 491
 492                 case 'p':
 493                         /* IP address pairs */
 494                         while (size >= 2*sizeof(ul)) {
 495                                 if (!first)
 496                                         putchar(',');
 497                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 498                                 printf("(%s:", ipaddr_string(&ul));
 499                                 bp += sizeof(ul);
 500                                 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
 501                                 printf("%s)", ipaddr_string(&ul));
 502                                 bp += sizeof(ul);
 503                                 size -= 2*sizeof(ul);
 504                                 first = 0;
 505                         }
 506                         break;
 507
 508                 case 's':
 509                         /* shorts */
 510                         while (size >= sizeof(us)) {
 511                                 if (!first)
 512                                         putchar(',');
 513                                 us = EXTRACT_16BITS(bp);
 514                                 printf("%u", us);
 515                                 bp += sizeof(us);
 516                                 size -= sizeof(us);
 517                                 first = 0;
 518                         }
 519                         break;
 520
 521                 case 'B':
 522                         /* boolean */
 523                         while (size > 0) {
 524                                 if (!first)
 525                                         putchar(',');
 526                                 switch (*bp) {
 527                                 case 0:
 528                                         putchar('N');
 529                                         break;
 530                                 case 1:
 531                                         putchar('Y');
 532                                         break;
 533                                 default:
 534                                         printf("%u?", *bp);
 535                                         break;
 536                                 }
 537                                 ++bp;
 538                                 --size;
 539                                 first = 0;
 540                         }
 541                         break;
 542
 543                 case 'b':
 544                 case 'x':
 545                 default:
 546                         /* Bytes */
 547                         while (size > 0) {
 548                                 if (!first)
 549                                         putchar(c == 'x' ? ':' : '.');
 550                                 if (c == 'x')
 551                                         printf("%02x", *bp);
 552                                 else
 553                                         printf("%u", *bp);
 554                                 ++bp;
 555                                 --size;
 556                                 first = 0;
 557                         }
 558                         break;
 559
 560                 case '$':
 561                         /* Guys we can't handle with one of the usual cases */
 562                         switch (tag) {
 563
 564                         case TAG_NETBIOS_NODE:
 565                                 tag = *bp++;
 566                                 --size;
 567                                 fputs(tok2str(nbo2str, NULL, tag), stdout);
 568                                 break;
 569
 570                         case TAG_OPT_OVERLOAD:
 571                                 tag = *bp++;
 572                                 --size;
 573                                 fputs(tok2str(oo2str, NULL, tag), stdout);
 574                                 break;
 575
 576                         case TAG_CLIENT_FQDN:
 577                                 /* option 81 should be at least 4 bytes long */
 578                                 if (len < 4)  {
 579                                         printf("ERROR: options 81 len %u < 4 bytes", len);
 580                                         break;
 581                                 }
 582                                 if (*bp++)
 583                                         printf("[svrreg]");
 584                                 if (*bp)
 585                                         printf("%u/%u/", *bp, *(bp+1));
 586                                 bp += 2;
 587                                 putchar('"');
 588                                 if (fn_printn(bp, size - 3, snapend)) {
 589                                         putchar('"');
 590                                         goto trunc;
 591                                 }
 592                                 putchar('"');
 593                                 bp += size - 3;
 594                                 size = 0;
 595                                 break;
 596
 597                         case TAG_CLIENT_ID:
 598                             {   int type = *bp++;
 599                                 size--;
 600                                 if (type == 0) {
 601                                         putchar('"');
 602                                         if (fn_printn(bp, size, snapend)) {
 603                                                 putchar('"');
 604                                                 goto trunc;
 605                                         }
 606                                         putchar('"');
 607                                         bp += size;
 608                                         size = 0;
 609                                         break;
 610                                 } else {
 611                                         printf("%s ", tok2str(arp2str, "hardware-type %u,", type));
 612                                 }
 613                                 while (size > 0) {
 614                                         if (!first)
 615                                                 putchar(':');
 616                                         printf("%02x", *bp);
 617                                         ++bp;
 618                                         --size;
 619                                         first = 0;
 620                                 }
 621                                 break;
 622                             }
 623
 624                         case TAG_AGENT_CIRCUIT:
 625                         {
 626                             while (size > 0 ) {
 627                             subopt = *bp++;
 628                             suboptlen = *bp++;
 629                             size -= 2;
 630                             printf("\n\t      %s SubOption %u, length %u: ",
 631                                    tok2str(agent_suboption_values, "Unknown", subopt),
 632                                    subopt,
 633                                    suboptlen);
 634
 635                             if (subopt == 0 || suboptlen == 0) {
 636                                 break;
 637                             }
 638
 639                             switch(subopt) {
 640                             case AGENT_SUBOPTION_CIRCUIT_ID:
 641                                 for (idx = 0; idx < suboptlen; idx++) {
 642                                     safeputchar(*(bp+idx));
 643                                 }
 644                                 break;
 645                             default:
 646                                 print_unknown_data(bp, "\n\t\t", suboptlen);
 647                             }
 648
 649                             size -= suboptlen;
 650                             bp += suboptlen;
 651                             }
 652                         }
 653                             break;
 654
 655                         default:
 656                                 printf("[unknown special tag %u, size %u]",
 657                                     tag, size);
 658                                 bp += size;
 659                                 size = 0;
 660                                 break;
 661                         }
 662                         break;
 663                 }
 664                 /* Data left over? */
 665                 if (size) {
 666                         printf("\n\t  trailing data length %u", len);
 667                         bp += size;
 668                 }
 669         }
 670         return;
 671 trunc:
 672         printf("|[rfc1048]");
 673 }
 674
 675 static void
 676 cmu_print(register const u_char *bp)
 677 {
 678         register const struct cmu_vend *cmu;
 679
 680 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
 681     if (cmu->m.s_addr != 0) \
 682         printf(" %s:%s", s, ipaddr_string(&cmu->m.s_addr)); }
 683
 684         printf(" vend-cmu");
 685         cmu = (const struct cmu_vend *)bp;
 686
 687         /* Only print if there are unknown bits */
 688         TCHECK(cmu->v_flags);
 689         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
 690                 printf(" F:0x%x", cmu->v_flags);
 691         PRINTCMUADDR(v_dgate, "DG");
 692         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
 693         PRINTCMUADDR(v_dns1, "NS1");
 694         PRINTCMUADDR(v_dns2, "NS2");
 695         PRINTCMUADDR(v_ins1, "IEN1");
 696         PRINTCMUADDR(v_ins2, "IEN2");
 697         PRINTCMUADDR(v_ts1, "TS1");
 698         PRINTCMUADDR(v_ts2, "TS2");
 699         return;
 700
 701 trunc:
 702         fputs(tstr, stdout);
 703 #undef PRINTCMUADDR
 704 }