contrib/tcpdump/print-dhcp6.c

   1 /*
   2  * Copyright (C) 1998 and 1999 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 /*
  30  * RFC3315: DHCPv6
  31  * supported DHCPv6 options:
  32  *  RFC3319: Session Initiation Protocol (SIP) Servers options,
  33  *  RFC3633: IPv6 Prefix options,
  34  *  RFC3646: DNS Configuration options,
  35  *  RFC3898: Network Information Service (NIS) Configuration options,
  36  *  RFC4075: Simple Network Time Protocol (SNTP) Configuration option,
  37  *  RFC4242: Information Refresh Time option,
  38  *  RFC4280: Broadcast and Multicast Control Servers options,
  39  *  RFC6334: Dual-Stack Lite option,
  40  */
  41
  42 #ifndef lint
  43 static const char rcsid[] _U_ =
  44     "@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.37 2008-02-06 10:26:09 guy Exp $";
  45 #endif
  46
  47 #ifdef HAVE_CONFIG_H
  48 #include "config.h"
  49 #endif
  50
  51 #include <tcpdump-stdinc.h>
  52
  53 #include <stdio.h>
  54 #include <string.h>
  55
  56 #include "interface.h"
  57 #include "addrtoname.h"
  58 #include "extract.h"
  59
  60 /* lease duration */
  61 #define DHCP6_DURATITION_INFINITE 0xffffffff
  62
  63 /* Error Values */
  64 #define DH6ERR_FAILURE          16
  65 #define DH6ERR_AUTHFAIL         17
  66 #define DH6ERR_POORLYFORMED     18
  67 #define DH6ERR_UNAVAIL          19
  68 #define DH6ERR_OPTUNAVAIL       20
  69
  70 /* Message type */
  71 #define DH6_SOLICIT     1
  72 #define DH6_ADVERTISE   2
  73 #define DH6_REQUEST     3
  74 #define DH6_CONFIRM     4
  75 #define DH6_RENEW       5
  76 #define DH6_REBIND      6
  77 #define DH6_REPLY       7
  78 #define DH6_RELEASE     8
  79 #define DH6_DECLINE     9
  80 #define DH6_RECONFIGURE 10
  81 #define DH6_INFORM_REQ  11
  82 #define DH6_RELAY_FORW  12
  83 #define DH6_RELAY_REPLY 13
  84 #define DH6_LEASEQUERY  14
  85 #define DH6_LQ_REPLY    15
  86
  87 /* DHCP6 base packet format */
  88 struct dhcp6 {
  89         union {
  90                 u_int8_t m;
  91                 u_int32_t x;
  92         } dh6_msgtypexid;
  93         /* options follow */
  94 };
  95 #define dh6_msgtype     dh6_msgtypexid.m
  96 #define dh6_xid         dh6_msgtypexid.x
  97 #define DH6_XIDMASK     0x00ffffff
  98
  99 /* DHCPv6 relay messages */
 100 struct dhcp6_relay {
 101         u_int8_t dh6relay_msgtype;
 102         u_int8_t dh6relay_hcnt;
 103         u_int8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
 104         u_int8_t dh6relay_peeraddr[16];
 105         /* options follow */
 106 };
 107
 108 /* options */
 109 #define DH6OPT_CLIENTID 1
 110 #define DH6OPT_SERVERID 2
 111 #define DH6OPT_IA_NA 3
 112 #define DH6OPT_IA_TA 4
 113 #define DH6OPT_IA_ADDR 5
 114 #define DH6OPT_ORO 6
 115 #define DH6OPT_PREFERENCE 7
 116 #  define DH6OPT_PREF_MAX 255
 117 #define DH6OPT_ELAPSED_TIME 8
 118 #define DH6OPT_RELAY_MSG 9
 119 /*#define DH6OPT_SERVER_MSG 10 deprecated */
 120 #define DH6OPT_AUTH 11
 121 #  define DH6OPT_AUTHPROTO_DELAYED 2
 122 #  define DH6OPT_AUTHPROTO_RECONFIG 3
 123 #  define DH6OPT_AUTHALG_HMACMD5 1
 124 #  define DH6OPT_AUTHRDM_MONOCOUNTER 0
 125 #  define DH6OPT_AUTHRECONFIG_KEY 1
 126 #  define DH6OPT_AUTHRECONFIG_HMACMD5 2
 127 #define DH6OPT_UNICAST 12
 128 #define DH6OPT_STATUS_CODE 13
 129 #  define DH6OPT_STCODE_SUCCESS 0
 130 #  define DH6OPT_STCODE_UNSPECFAIL 1
 131 #  define DH6OPT_STCODE_NOADDRAVAIL 2
 132 #  define DH6OPT_STCODE_NOBINDING 3
 133 #  define DH6OPT_STCODE_NOTONLINK 4
 134 #  define DH6OPT_STCODE_USEMULTICAST 5
 135 #  define DH6OPT_STCODE_NOPREFIXAVAIL 6
 136 #  define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7
 137 #  define DH6OPT_STCODE_MALFORMEDQUERY 8
 138 #  define DH6OPT_STCODE_NOTCONFIGURED 9
 139 #  define DH6OPT_STCODE_NOTALLOWED 10
 140 #define DH6OPT_RAPID_COMMIT 14
 141 #define DH6OPT_USER_CLASS 15
 142 #define DH6OPT_VENDOR_CLASS 16
 143 #define DH6OPT_VENDOR_OPTS 17
 144 #define DH6OPT_INTERFACE_ID 18
 145 #define DH6OPT_RECONF_MSG 19
 146 #define DH6OPT_RECONF_ACCEPT 20
 147 #define DH6OPT_SIP_SERVER_D 21
 148 #define DH6OPT_SIP_SERVER_A 22
 149 #define DH6OPT_DNS 23
 150 #define DH6OPT_DNSNAME 24
 151 #define DH6OPT_IA_PD 25
 152 #define DH6OPT_IA_PD_PREFIX 26
 153 #define DH6OPT_NIS_SERVERS 27
 154 #define DH6OPT_NISP_SERVERS 28
 155 #define DH6OPT_NIS_NAME 29
 156 #define DH6OPT_NISP_NAME 30
 157 #define DH6OPT_NTP_SERVERS 31
 158 #define DH6OPT_LIFETIME 32
 159 #define DH6OPT_BCMCS_SERVER_D 33
 160 #define DH6OPT_BCMCS_SERVER_A 34
 161 #define DH6OPT_GEOCONF_CIVIC 36
 162 #define DH6OPT_REMOTE_ID 37
 163 #define DH6OPT_SUBSCRIBER_ID 38
 164 #define DH6OPT_CLIENT_FQDN 39
 165 #define DH6OPT_PANA_AGENT 40
 166 #define DH6OPT_NEW_POSIX_TIMEZONE 41
 167 #define DH6OPT_NEW_TZDB_TIMEZONE 42
 168 #define DH6OPT_ERO 43
 169 #define DH6OPT_LQ_QUERY 44
 170 #define DH6OPT_CLIENT_DATA 45
 171 #define DH6OPT_CLT_TIME 46
 172 #define DH6OPT_LQ_RELAY_DATA 47
 173 #define DH6OPT_LQ_CLIENT_LINK 48
 174 #define DH6OPT_AFTR_NAME 64
 175
 176 struct dhcp6opt {
 177         u_int16_t dh6opt_type;
 178         u_int16_t dh6opt_len;
 179         /* type-dependent data follows */
 180 };
 181
 182 static const char *
 183 dhcp6opt_name(int type)
 184 {
 185         static char genstr[sizeof("opt_65535") + 1]; /* XXX thread unsafe */
 186
 187         if (type > 65535)
 188                 return "INVALID-option";
 189
 190         switch(type) {
 191         case DH6OPT_CLIENTID:
 192                 return "client-ID";
 193         case DH6OPT_SERVERID:
 194                 return "server-ID";
 195         case DH6OPT_IA_NA:
 196                 return "IA_NA";
 197         case DH6OPT_IA_TA:
 198                 return "IA_TA";
 199         case DH6OPT_IA_ADDR:
 200                 return "IA_ADDR";
 201         case DH6OPT_ORO:
 202                 return "option-request";
 203         case DH6OPT_PREFERENCE:
 204                 return "preference";
 205         case DH6OPT_ELAPSED_TIME:
 206                 return "elapsed-time";
 207         case DH6OPT_RELAY_MSG:
 208                 return "relay-message";
 209         case DH6OPT_AUTH:
 210                 return "authentication";
 211         case DH6OPT_UNICAST:
 212                 return "server-unicast";
 213         case DH6OPT_STATUS_CODE:
 214                 return "status-code";
 215         case DH6OPT_RAPID_COMMIT:
 216                 return "rapid-commit";
 217         case DH6OPT_USER_CLASS:
 218                 return "user-class";
 219         case DH6OPT_VENDOR_CLASS:
 220                 return "vendor-class";
 221         case DH6OPT_VENDOR_OPTS:
 222                 return "vendor-specific-info";
 223         case DH6OPT_INTERFACE_ID:
 224                 return "interface-ID";
 225         case DH6OPT_RECONF_MSG:
 226                 return "reconfigure-message";
 227         case DH6OPT_RECONF_ACCEPT:
 228                 return "reconfigure-accept";
 229         case DH6OPT_SIP_SERVER_D:
 230                 return "SIP-servers-domain";
 231         case DH6OPT_SIP_SERVER_A:
 232                 return "SIP-servers-address";
 233         case DH6OPT_DNS:
 234                 return "DNS-server";
 235         case DH6OPT_DNSNAME:
 236                 return "DNS-search-list";
 237         case DH6OPT_IA_PD:
 238                 return "IA_PD";
 239         case DH6OPT_IA_PD_PREFIX:
 240                 return "IA_PD-prefix";
 241         case DH6OPT_NTP_SERVERS:
 242                 return "NTP-server";
 243         case DH6OPT_LIFETIME:
 244                 return "lifetime";
 245         case DH6OPT_NIS_SERVERS:
 246                 return "NIS-server";
 247         case DH6OPT_NISP_SERVERS:
 248                 return "NIS+-server";
 249         case DH6OPT_NIS_NAME:
 250                 return "NIS-domain-name";
 251         case DH6OPT_NISP_NAME:
 252                 return "NIS+-domain-name";
 253         case DH6OPT_BCMCS_SERVER_D:
 254                 return "BCMCS-domain-name";
 255         case DH6OPT_BCMCS_SERVER_A:
 256                 return "BCMCS-server";
 257         case DH6OPT_GEOCONF_CIVIC:
 258                 return "Geoconf-Civic";
 259         case DH6OPT_REMOTE_ID:
 260                 return "Remote-ID";
 261         case DH6OPT_SUBSCRIBER_ID:
 262                 return "Subscriber-ID";
 263         case DH6OPT_CLIENT_FQDN:
 264                 return "Client-FQDN";
 265         case DH6OPT_PANA_AGENT:
 266                 return "PANA-agent";
 267         case DH6OPT_NEW_POSIX_TIMEZONE:
 268                 return "POSIX-timezone";
 269         case DH6OPT_NEW_TZDB_TIMEZONE:
 270                 return "POSIX-tz-database";
 271         case DH6OPT_ERO:
 272                 return "Echo-request-option";
 273         case DH6OPT_LQ_QUERY:
 274                 return "Lease-query";
 275         case DH6OPT_CLIENT_DATA:
 276                 return "LQ-client-data";
 277         case DH6OPT_CLT_TIME:
 278                 return "Clt-time";
 279         case DH6OPT_LQ_RELAY_DATA:
 280                 return "LQ-relay-data";
 281         case DH6OPT_LQ_CLIENT_LINK:
 282                 return "LQ-client-link";
 283         case DH6OPT_AFTR_NAME:
 284                 return "AFTR-Name";
 285         default:
 286                 snprintf(genstr, sizeof(genstr), "opt_%d", type);
 287                 return(genstr);
 288         }
 289 }
 290
 291 static const char *
 292 dhcp6stcode(int code)
 293 {
 294         static char genstr[sizeof("code255") + 1]; /* XXX thread unsafe */
 295
 296         if (code > 255)
 297                 return "INVALID code";
 298
 299         switch(code) {
 300         case DH6OPT_STCODE_SUCCESS:
 301                 return "success";
 302         case DH6OPT_STCODE_UNSPECFAIL:
 303                 return "unspec failure";
 304         case DH6OPT_STCODE_NOADDRAVAIL:
 305                 return "no addresses";
 306         case DH6OPT_STCODE_NOBINDING:
 307                 return "no binding";
 308         case DH6OPT_STCODE_NOTONLINK:
 309                 return "not on-link";
 310         case DH6OPT_STCODE_USEMULTICAST:
 311                 return "use multicast";
 312         case DH6OPT_STCODE_NOPREFIXAVAIL:
 313                 return "no prefixes";
 314         case DH6OPT_STCODE_UNKNOWNQUERYTYPE:
 315                 return "unknown query type";
 316         case DH6OPT_STCODE_MALFORMEDQUERY:
 317                 return "malformed query";
 318         case DH6OPT_STCODE_NOTCONFIGURED:
 319                 return "not configured";
 320         case DH6OPT_STCODE_NOTALLOWED:
 321                 return "not allowed";
 322         default:
 323                 snprintf(genstr, sizeof(genstr), "code%d", code);
 324                 return(genstr);
 325         }
 326 }
 327
 328 static void
 329 dhcp6opt_print(const u_char *cp, const u_char *ep)
 330 {
 331         struct dhcp6opt *dh6o;
 332         u_char *tp;
 333         size_t i;
 334         u_int16_t opttype;
 335         size_t optlen;
 336         u_int8_t auth_proto;
 337         u_int authinfolen, authrealmlen;
 338
 339         if (cp == ep)
 340                 return;
 341         while (cp < ep) {
 342                 if (ep < cp + sizeof(*dh6o))
 343                         goto trunc;
 344                 dh6o = (struct dhcp6opt *)cp;
 345                 TCHECK(*dh6o);
 346                 optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
 347                 if (ep < cp + sizeof(*dh6o) + optlen)
 348                         goto trunc;
 349                 opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
 350                 printf(" (%s", dhcp6opt_name(opttype));
 351                 switch (opttype) {
 352                 case DH6OPT_CLIENTID:
 353                 case DH6OPT_SERVERID:
 354                         if (optlen < 2) {
 355                                 /*(*/
 356                                 printf(" ?)");
 357                                 break;
 358                         }
 359                         tp = (u_char *)(dh6o + 1);
 360                         switch (EXTRACT_16BITS(tp)) {
 361                         case 1:
 362                                 if (optlen >= 2 + 6) {
 363                                         printf(" hwaddr/time type %u time %u ",
 364                                             EXTRACT_16BITS(&tp[2]),
 365                                             EXTRACT_32BITS(&tp[4]));
 366                                         for (i = 8; i < optlen; i++)
 367                                                 printf("%02x", tp[i]);
 368                                         /*(*/
 369                                         printf(")");
 370                                 } else {
 371                                         /*(*/
 372                                         printf(" ?)");
 373                                 }
 374                                 break;
 375                         case 2:
 376                                 if (optlen >= 2 + 8) {
 377                                         printf(" vid ");
 378                                         for (i = 2; i < 2 + 8; i++)
 379                                                 printf("%02x", tp[i]);
 380                                         /*(*/
 381                                         printf(")");
 382                                 } else {
 383                                         /*(*/
 384                                         printf(" ?)");
 385                                 }
 386                                 break;
 387                         case 3:
 388                                 if (optlen >= 2 + 2) {
 389                                         printf(" hwaddr type %u ",
 390                                             EXTRACT_16BITS(&tp[2]));
 391                                         for (i = 4; i < optlen; i++)
 392                                                 printf("%02x", tp[i]);
 393                                         /*(*/
 394                                         printf(")");
 395                                 } else {
 396                                         /*(*/
 397                                         printf(" ?)");
 398                                 }
 399                                 break;
 400                         default:
 401                                 printf(" type %d)", EXTRACT_16BITS(tp));
 402                                 break;
 403                         }
 404                         break;
 405                 case DH6OPT_IA_ADDR:
 406                         if (optlen < 24) {
 407                                 /*(*/
 408                                 printf(" ?)");
 409                                 break;
 410                         }
 411                         tp = (u_char *)(dh6o + 1);
 412                         printf(" %s", ip6addr_string(&tp[0]));
 413                         printf(" pltime:%u vltime:%u",
 414                             EXTRACT_32BITS(&tp[16]),
 415                             EXTRACT_32BITS(&tp[20]));
 416                         if (optlen > 24) {
 417                                 /* there are sub-options */
 418                                 dhcp6opt_print(tp + 24, tp + optlen);
 419                         }
 420                         printf(")");
 421                         break;
 422                 case DH6OPT_ORO:
 423                 case DH6OPT_ERO:
 424                         if (optlen % 2) {
 425                                 printf(" ?)");
 426                                 break;
 427                         }
 428                         tp = (u_char *)(dh6o + 1);
 429                         for (i = 0; i < optlen; i += 2) {
 430                                 printf(" %s",
 431                                     dhcp6opt_name(EXTRACT_16BITS(&tp[i])));
 432                         }
 433                         printf(")");
 434                         break;
 435                 case DH6OPT_PREFERENCE:
 436                         if (optlen != 1) {
 437                                 printf(" ?)");
 438                                 break;
 439                         }
 440                         tp = (u_char *)(dh6o + 1);
 441                         printf(" %d)", *tp);
 442                         break;
 443                 case DH6OPT_ELAPSED_TIME:
 444                         if (optlen != 2) {
 445                                 printf(" ?)");
 446                                 break;
 447                         }
 448                         tp = (u_char *)(dh6o + 1);
 449                         printf(" %d)", EXTRACT_16BITS(tp));
 450                         break;
 451                 case DH6OPT_RELAY_MSG:
 452                         printf(" (");
 453                         tp = (u_char *)(dh6o + 1);
 454                         dhcp6_print(tp, optlen);
 455                         printf(")");
 456                         break;
 457                 case DH6OPT_AUTH:
 458                         if (optlen < 11) {
 459                                 printf(" ?)");
 460                                 break;
 461                         }
 462                         tp = (u_char *)(dh6o + 1);
 463                         auth_proto = *tp;
 464                         switch (auth_proto) {
 465                         case DH6OPT_AUTHPROTO_DELAYED:
 466                                 printf(" proto: delayed");
 467                                 break;
 468                         case DH6OPT_AUTHPROTO_RECONFIG:
 469                                 printf(" proto: reconfigure");
 470                                 break;
 471                         default:
 472                                 printf(" proto: %d", auth_proto);
 473                                 break;
 474                         }
 475                         tp++;
 476                         switch (*tp) {
 477                         case DH6OPT_AUTHALG_HMACMD5:
 478                                 /* XXX: may depend on the protocol */
 479                                 printf(", alg: HMAC-MD5");
 480                                 break;
 481                         default:
 482                                 printf(", alg: %d", *tp);
 483                                 break;
 484                         }
 485                         tp++;
 486                         switch (*tp) {
 487                         case DH6OPT_AUTHRDM_MONOCOUNTER:
 488                                 printf(", RDM: mono");
 489                                 break;
 490                         default:
 491                                 printf(", RDM: %d", *tp);
 492                                 break;
 493                         }
 494                         tp++;
 495                         printf(", RD:");
 496                         for (i = 0; i < 4; i++, tp += 2)
 497                                 printf(" %04x", EXTRACT_16BITS(tp));
 498
 499                         /* protocol dependent part */
 500                         authinfolen = optlen - 11;
 501                         switch (auth_proto) {
 502                         case DH6OPT_AUTHPROTO_DELAYED:
 503                                 if (authinfolen == 0)
 504                                         break;
 505                                 if (authinfolen < 20) {
 506                                         printf(" ??");
 507                                         break;
 508                                 }
 509                                 authrealmlen = authinfolen - 20;
 510                                 if (authrealmlen > 0) {
 511                                         printf(", realm: ");
 512                                 }
 513                                 for (i = 0; i < authrealmlen; i++, tp++)
 514                                         printf("%02x", *tp);
 515                                 printf(", key ID: %08x", EXTRACT_32BITS(tp));
 516                                 tp += 4;
 517                                 printf(", HMAC-MD5:");
 518                                 for (i = 0; i < 4; i++, tp+= 4)
 519                                         printf(" %08x", EXTRACT_32BITS(tp));
 520                                 break;
 521                         case DH6OPT_AUTHPROTO_RECONFIG:
 522                                 if (authinfolen != 17) {
 523                                         printf(" ??");
 524                                         break;
 525                                 }
 526                                 switch (*tp++) {
 527                                 case DH6OPT_AUTHRECONFIG_KEY:
 528                                         printf(" reconfig-key");
 529                                         break;
 530                                 case DH6OPT_AUTHRECONFIG_HMACMD5:
 531                                         printf(" type: HMAC-MD5");
 532                                         break;
 533                                 default:
 534                                         printf(" type: ??");
 535                                         break;
 536                                 }
 537                                 printf(" value:");
 538                                 for (i = 0; i < 4; i++, tp+= 4)
 539                                         printf(" %08x", EXTRACT_32BITS(tp));
 540                                 break;
 541                         default:
 542                                 printf(" ??");
 543                                 break;
 544                         }
 545
 546                         printf(")");
 547                         break;
 548                 case DH6OPT_RAPID_COMMIT: /* nothing todo */
 549                         printf(")");
 550                         break;
 551                 case DH6OPT_INTERFACE_ID:
 552                 case DH6OPT_SUBSCRIBER_ID:
 553                         /*
 554                          * Since we cannot predict the encoding, print hex dump
 555                          * at most 10 characters.
 556                          */
 557                         tp = (u_char *)(dh6o + 1);
 558                         printf(" ");
 559                         for (i = 0; i < optlen && i < 10; i++)
 560                                 printf("%02x", tp[i]);
 561                         printf("...)");
 562                         break;
 563                 case DH6OPT_RECONF_MSG:
 564                         tp = (u_char *)(dh6o + 1);
 565                         switch (*tp) {
 566                         case DH6_RENEW:
 567                                 printf(" for renew)");
 568                                 break;
 569                         case DH6_INFORM_REQ:
 570                                 printf(" for inf-req)");
 571                                 break;
 572                         default:
 573                                 printf(" for ?\?\?(%02x))", *tp);
 574                                 break;
 575                         }
 576                         break;
 577                 case DH6OPT_RECONF_ACCEPT: /* nothing todo */
 578                         printf(")");
 579                         break;
 580                 case DH6OPT_SIP_SERVER_A:
 581                 case DH6OPT_DNS:
 582                 case DH6OPT_NTP_SERVERS:
 583                 case DH6OPT_NIS_SERVERS:
 584                 case DH6OPT_NISP_SERVERS:
 585                 case DH6OPT_BCMCS_SERVER_A:
 586                 case DH6OPT_PANA_AGENT:
 587                 case DH6OPT_LQ_CLIENT_LINK:
 588                         if (optlen % 16) {
 589                                 printf(" ?)");
 590                                 break;
 591                         }
 592                         tp = (u_char *)(dh6o + 1);
 593                         for (i = 0; i < optlen; i += 16)
 594                                 printf(" %s", ip6addr_string(&tp[i]));
 595                         printf(")");
 596                         break;
 597                 case DH6OPT_STATUS_CODE:
 598                         if (optlen < 2) {
 599                                 printf(" ?)");
 600                                 break;
 601                         }
 602                         tp = (u_char *)(dh6o + 1);
 603                         printf(" %s)", dhcp6stcode(EXTRACT_16BITS(&tp[0])));
 604                         break;
 605                 case DH6OPT_IA_NA:
 606                 case DH6OPT_IA_PD:
 607                         if (optlen < 12) {
 608                                 printf(" ?)");
 609                                 break;
 610                         }
 611                         tp = (u_char *)(dh6o + 1);
 612                         printf(" IAID:%u T1:%u T2:%u",
 613                             EXTRACT_32BITS(&tp[0]),
 614                             EXTRACT_32BITS(&tp[4]),
 615                             EXTRACT_32BITS(&tp[8]));
 616                         if (optlen > 12) {
 617                                 /* there are sub-options */
 618                                 dhcp6opt_print(tp + 12, tp + optlen);
 619                         }
 620                         printf(")");
 621                         break;
 622                 case DH6OPT_IA_TA:
 623                         if (optlen < 4) {
 624                                 printf(" ?)");
 625                                 break;
 626                         }
 627                         tp = (u_char *)(dh6o + 1);
 628                         printf(" IAID:%u", EXTRACT_32BITS(tp));
 629                         if (optlen > 4) {
 630                                 /* there are sub-options */
 631                                 dhcp6opt_print(tp + 4, tp + optlen);
 632                         }
 633                         printf(")");
 634                         break;
 635                 case DH6OPT_IA_PD_PREFIX:
 636                         if (optlen < 25) {
 637                                 printf(" ?)");
 638                                 break;
 639                         }
 640                         tp = (u_char *)(dh6o + 1);
 641                         printf(" %s/%d", ip6addr_string(&tp[9]), tp[8]);
 642                         printf(" pltime:%u vltime:%u",
 643                             EXTRACT_32BITS(&tp[0]),
 644                             EXTRACT_32BITS(&tp[4]));
 645                         if (optlen > 25) {
 646                                 /* there are sub-options */
 647                                 dhcp6opt_print(tp + 25, tp + optlen);
 648                         }
 649                         printf(")");
 650                         break;
 651                 case DH6OPT_LIFETIME:
 652                 case DH6OPT_CLT_TIME:
 653                         if (optlen != 4) {
 654                                 printf(" ?)");
 655                                 break;
 656                         }
 657                         tp = (u_char *)(dh6o + 1);
 658                         printf(" %d)", EXTRACT_32BITS(tp));
 659                         break;
 660                 case DH6OPT_REMOTE_ID:
 661                         if (optlen < 4) {
 662                                 printf(" ?)");
 663                                 break;
 664                         }
 665                         tp = (u_char *)(dh6o + 1);
 666                         printf(" %d ", EXTRACT_32BITS(tp));
 667                         /*
 668                          * Print hex dump first 10 characters.
 669                          */
 670                         for (i = 4; i < optlen && i < 14; i++)
 671                                 printf("%02x", tp[i]);
 672                         printf("...)");
 673                         break;
 674                 case DH6OPT_LQ_QUERY:
 675                         if (optlen < 17) {
 676                                 printf(" ?)");
 677                                 break;
 678                         }
 679                         tp = (u_char *)(dh6o + 1);
 680                         switch (*tp) {
 681                         case 1:
 682                                 printf(" by-address");
 683                                 break;
 684                         case 2:
 685                                 printf(" by-clientID");
 686                                 break;
 687                         default:
 688                                 printf(" type_%d", (int)*tp);
 689                                 break;
 690                         }
 691                         printf(" %s", ip6addr_string(&tp[1]));
 692                         if (optlen > 17) {
 693                                 /* there are query-options */
 694                                 dhcp6opt_print(tp + 17, tp + optlen);
 695                         }
 696                         printf(")");
 697                         break;
 698                 case DH6OPT_CLIENT_DATA:
 699                         tp = (u_char *)(dh6o + 1);
 700                         if (optlen > 0) {
 701                                 /* there are encapsulated options */
 702                                 dhcp6opt_print(tp, tp + optlen);
 703                         }
 704                         printf(")");
 705                         break;
 706                 case DH6OPT_LQ_RELAY_DATA:
 707                         if (optlen < 16) {
 708                                 printf(" ?)");
 709                                 break;
 710                         }
 711                         tp = (u_char *)(dh6o + 1);
 712                         printf(" %s ", ip6addr_string(&tp[0]));
 713                         /*
 714                          * Print hex dump first 10 characters.
 715                          */
 716                         for (i = 16; i < optlen && i < 26; i++)
 717                                 printf("%02x", tp[i]);
 718                         printf("...)");
 719                         break;
 720                 case DH6OPT_AFTR_NAME:
 721                         if (optlen < 3) {
 722                                 printf(" ?)");
 723                                 break;
 724                         }
 725                         tp = (u_char *)(dh6o + 1);
 726                         int remain_len = optlen;
 727                         printf(" ");
 728                         /* Encoding is described in section 3.1 of RFC 1035 */
 729                         int label_len; /* Label length */
 730                         while (remain_len && *tp) {
 731                                 label_len =  *tp++;
 732                                 if (label_len < remain_len - 1) {
 733                                         printf("%.*s", label_len, tp);
 734                                         tp += label_len;
 735                                         remain_len -= (label_len + 1);
 736                                         if(*tp) printf(".");
 737                                 } else {
 738                                         printf(" ?");
 739                                         break;
 740                                 }
 741                         }
 742                         printf(")");
 743                         break;
 744                 default:
 745                         printf(")");
 746                         break;
 747                 }
 748
 749                 cp += sizeof(*dh6o) + optlen;
 750         }
 751         return;
 752
 753 trunc:
 754         printf("[|dhcp6ext]");
 755 }
 756
 757 /*
 758  * Print dhcp6 packets
 759  */
 760 void
 761 dhcp6_print(const u_char *cp, u_int length)
 762 {
 763         struct dhcp6 *dh6;
 764         struct dhcp6_relay *dh6relay;
 765         const u_char *ep;
 766         u_char *extp;
 767         const char *name;
 768
 769         printf("dhcp6");
 770
 771         ep = (u_char *)snapend;
 772         if (cp + length < ep)
 773                 ep = cp + length;
 774
 775         dh6 = (struct dhcp6 *)cp;
 776         dh6relay = (struct dhcp6_relay *)cp;
 777         TCHECK(dh6->dh6_xid);
 778         switch (dh6->dh6_msgtype) {
 779         case DH6_SOLICIT:
 780                 name = "solicit";
 781                 break;
 782         case DH6_ADVERTISE:
 783                 name = "advertise";
 784                 break;
 785         case DH6_REQUEST:
 786                 name = "request";
 787                 break;
 788         case DH6_CONFIRM:
 789                 name = "confirm";
 790                 break;
 791         case DH6_RENEW:
 792                 name = "renew";
 793                 break;
 794         case DH6_REBIND:
 795                 name = "rebind";
 796                 break;
 797         case DH6_REPLY:
 798                 name = "reply";
 799                 break;
 800         case DH6_RELEASE:
 801                 name = "release";
 802                 break;
 803         case DH6_DECLINE:
 804                 name = "decline";
 805                 break;
 806         case DH6_RECONFIGURE:
 807                 name = "reconfigure";
 808                 break;
 809         case DH6_INFORM_REQ:
 810                 name= "inf-req";
 811                 break;
 812         case DH6_RELAY_FORW:
 813                 name= "relay-fwd";
 814                 break;
 815         case DH6_RELAY_REPLY:
 816                 name= "relay-reply";
 817                 break;
 818         case DH6_LEASEQUERY:
 819                 name= "leasequery";
 820                 break;
 821         case DH6_LQ_REPLY:
 822                 name= "leasequery-reply";
 823                 break;
 824         default:
 825                 name = NULL;
 826                 break;
 827         }
 828
 829         if (!vflag) {
 830                 if (name)
 831                         printf(" %s", name);
 832                 else if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
 833                     dh6->dh6_msgtype != DH6_RELAY_REPLY) {
 834                         printf(" msgtype-%u", dh6->dh6_msgtype);
 835                 }
 836                 return;
 837         }
 838
 839         /* XXX relay agent messages have to be handled differently */
 840
 841         if (name)
 842                 printf(" %s (", name);  /*)*/
 843         else
 844                 printf(" msgtype-%u (", dh6->dh6_msgtype);      /*)*/
 845         if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
 846             dh6->dh6_msgtype != DH6_RELAY_REPLY) {
 847                 printf("xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK);
 848                 extp = (u_char *)(dh6 + 1);
 849                 dhcp6opt_print(extp, ep);
 850         } else {                /* relay messages */
 851                 struct in6_addr addr6;
 852
 853                 TCHECK(dh6relay->dh6relay_peeraddr);
 854
 855                 memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6));
 856                 printf("linkaddr=%s", ip6addr_string(&addr6));
 857
 858                 memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
 859                 printf(" peeraddr=%s", ip6addr_string(&addr6));
 860
 861                 dhcp6opt_print((u_char *)(dh6relay + 1), ep);
 862         }
 863         /*(*/
 864         printf(")");
 865         return;
 866
 867 trunc:
 868         printf("[|dhcp6]");
 869 }