The Tcpdump Group git mirrors - tcpdump/blob - 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  * draft-ietf-dhc-dhcpv6-26.txt
  31  */
  32
  33 #ifndef lint
  34 static const char rcsid[] =
  35     "@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.24 2002-12-11 22:29:21 guy Exp $";
  36 #endif
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include "config.h"
  40 #endif
  41
  42 #include <tcpdump-stdinc.h>
  43
  44 #include <stdio.h>
  45 #include <string.h>
  46
  47 #include "interface.h"
  48 #include "addrtoname.h"
  49 #include "extract.h"
  50
  51 /* lease duration */
  52 #define DHCP6_DURATITION_INFINITE 0xffffffff
  53
  54 /* Error Values */
  55 #define DH6ERR_FAILURE          16
  56 #define DH6ERR_AUTHFAIL         17
  57 #define DH6ERR_POORLYFORMED     18
  58 #define DH6ERR_UNAVAIL          19
  59 #define DH6ERR_OPTUNAVAIL       20
  60
  61 /* Message type */
  62 #define DH6_SOLICIT     1
  63 #define DH6_ADVERTISE   2
  64 #define DH6_REQUEST     3
  65 #define DH6_CONFIRM     4
  66 #define DH6_RENEW       5
  67 #define DH6_REBIND      6
  68 #define DH6_REPLY       7
  69 #define DH6_INFORM_REQ  11
  70
  71 /* DHCP6 base packet format */
  72 struct dhcp6 {
  73         union {
  74                 u_int8_t m;
  75                 u_int32_t x;
  76         } dh6_msgtypexid;
  77         /* options follow */
  78 };
  79 #define dh6_msgtype     dh6_msgtypexid.m
  80 #define dh6_xid         dh6_msgtypexid.x
  81 #define DH6_XIDMASK     0x00ffffff
  82
  83 /* option */
  84 #define DH6OPT_CLIENTID 1
  85 #define DH6OPT_SERVERID 2
  86 #define DH6OPT_IA 3
  87 #define DH6OPT_IA_TMP 4
  88 #define DH6OPT_IADDR 5
  89 #define DH6OPT_ORO 6
  90 #define DH6OPT_PREFERENCE 7
  91 #  define DH6OPT_PREF_UNDEF -1
  92 #  define DH6OPT_PREF_MAX 255
  93 #define DH6OPT_ELAPSED_TIME 8
  94 #define DH6OPT_CLIENT_MSG 9
  95 #define DH6OPT_SERVER_MSG 10
  96 #define DH6OPT_AUTH 11
  97 #define DH6OPT_UNICAST 12
  98 #define DH6OPT_STATUS_CODE 13
  99 #  define DH6OPT_STCODE_SUCCESS 0
 100 #  define DH6OPT_STCODE_UNSPECFAIL 1
 101 #  define DH6OPT_STCODE_AUTHFAILED 2
 102 #  define DH6OPT_STCODE_ADDRUNAVAIL 3
 103 #  define DH6OPT_STCODE_NOADDRAVAIL 4
 104 #  define DH6OPT_STCODE_NOBINDING 5
 105 #  define DH6OPT_STCODE_CONFNOMATCH 6
 106 #  define DH6OPT_STCODE_NOTONLINK 7
 107 #  define DH6OPT_STCODE_USEMULTICAST 8
 108 #define DH6OPT_RAPID_COMMIT 14
 109 #define DH6OPT_USER_CLASS 15
 110 #define DH6OPT_VENDOR_CLASS 16
 111 #define DH6OPT_VENDOR_OPTS 17
 112 #define DH6OPT_INTERFACE_ID 18
 113 #define DH6OPT_RECONF_MSG 19
 114
 115 /*
 116  * The option type has not been assigned for the following options.
 117  * We temporarily adopt values used in the service specification document
 118  * (200206xx version) by NTT Communications.
 119  * Note that we'll change the following definitions if different type values
 120  * are officially assigned.
 121  */
 122 #define DH6OPT_DNS 25
 123 #define DH6OPT_PREFIX_DELEGATION 30
 124 #define DH6OPT_PREFIX_INFORMATION 31
 125 #define DH6OPT_PREFIX_REQUEST 32
 126
 127 struct dhcp6opt {
 128         u_int16_t dh6opt_type;
 129         u_int16_t dh6opt_len;
 130         /* type-dependent data follows */
 131 };
 132
 133 static const char *
 134 dhcp6opt_name(int type)
 135 {
 136         static char genstr[sizeof("opt_65535") + 1]; /* XXX thread unsafe */
 137
 138         if (type > 65535)
 139                 return "INVALID option";
 140
 141         switch(type) {
 142         case DH6OPT_CLIENTID:
 143                 return "client ID";
 144         case DH6OPT_SERVERID:
 145                 return "server ID";
 146         case DH6OPT_ORO:
 147                 return "option request";
 148         case DH6OPT_PREFERENCE:
 149                 return "preference";
 150         case DH6OPT_STATUS_CODE:
 151                 return "status code";
 152         case DH6OPT_RAPID_COMMIT:
 153                 return "rapid commit";
 154         case DH6OPT_DNS:
 155                 return "DNS";
 156         case DH6OPT_PREFIX_DELEGATION:
 157                 return "prefix delegation";
 158         case DH6OPT_PREFIX_INFORMATION:
 159                 return "prefix information";
 160         default:
 161                 sprintf(genstr, "opt_%d", type);
 162                 return(genstr);
 163         }
 164 }
 165
 166 static const char *
 167 dhcp6stcode(int code)
 168 {
 169         static char genstr[sizeof("code255") + 1]; /* XXX thread unsafe */
 170
 171         if (code > 255)
 172                 return "INVALID code";
 173
 174         switch(code) {
 175         case DH6OPT_STCODE_SUCCESS:
 176                 return "success";
 177         case DH6OPT_STCODE_UNSPECFAIL:
 178                 return "unspec failure";
 179         case DH6OPT_STCODE_AUTHFAILED:
 180                 return "auth fail";
 181         case DH6OPT_STCODE_ADDRUNAVAIL:
 182                 return "address unavailable";
 183         case DH6OPT_STCODE_NOADDRAVAIL:
 184                 return "no addresses";
 185         case DH6OPT_STCODE_NOBINDING:
 186                 return "no binding";
 187         case DH6OPT_STCODE_CONFNOMATCH:
 188                 return "confirm no match";
 189         case DH6OPT_STCODE_NOTONLINK:
 190                 return "not on-link";
 191         case DH6OPT_STCODE_USEMULTICAST:
 192                 return "use multicast";
 193         default:
 194                 sprintf(genstr, "code%d", code);
 195                 return(genstr);
 196         }
 197 }
 198
 199 static void
 200 dhcp6opt_print(u_char *cp, u_char *ep)
 201 {
 202         struct dhcp6opt *dh6o;
 203         u_char *tp;
 204         size_t i;
 205         u_int16_t opttype;
 206         size_t optlen;
 207         u_int16_t val16;
 208         u_int32_t val32;
 209         struct in6_addr addr6;
 210
 211         if (cp == ep)
 212                 return;
 213         while (cp < ep) {
 214                 if (ep < cp + sizeof(*dh6o))
 215                         goto trunc;
 216                 dh6o = (struct dhcp6opt *)cp;
 217                 optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
 218                 if (ep < cp + sizeof(*dh6o) + optlen)
 219                         goto trunc;
 220                 opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
 221                 printf(" (%s", dhcp6opt_name(opttype));
 222                 switch (opttype) {
 223                 case DH6OPT_CLIENTID:
 224                 case DH6OPT_SERVERID:
 225                         if (optlen < 2) {
 226                                 /*(*/
 227                                 printf(" ?)");
 228                                 break;
 229                         }
 230                         tp = (u_char *)(dh6o + 1);
 231                         switch (EXTRACT_16BITS(tp)) {
 232                         case 1:
 233                                 if (optlen >= 2 + 6) {
 234                                         printf(" hwaddr/time type %u time %u ",
 235                                             EXTRACT_16BITS(&tp[2]),
 236                                             EXTRACT_32BITS(&tp[4]));
 237                                         for (i = 8; i < optlen; i++)
 238                                                 printf("%02x", tp[i]);
 239                                         /*(*/
 240                                         printf(")");
 241                                 } else {
 242                                         /*(*/
 243                                         printf(" ?)");
 244                                 }
 245                                 break;
 246                         case 2:
 247                                 if (optlen >= 2 + 8) {
 248                                         printf(" vid ");
 249                                         for (i = 2; i < 2 + 8; i++)
 250                                                 printf("%02x", tp[i]);
 251                                         /*(*/
 252                                         printf(")");
 253                                 } else {
 254                                         /*(*/
 255                                         printf(" ?)");
 256                                 }
 257                                 break;
 258                         case 3:
 259                                 if (optlen >= 2 + 2) {
 260                                         printf(" hwaddr type %u ",
 261                                             EXTRACT_16BITS(&tp[2]));
 262                                         for (i = 4; i < optlen; i++)
 263                                                 printf("%02x", tp[i]);
 264                                         /*(*/
 265                                         printf(")");
 266                                 } else {
 267                                         /*(*/
 268                                         printf(" ?)");
 269                                 }
 270                                 break;
 271                         default:
 272                                 printf(" type %d)", EXTRACT_16BITS(tp));
 273                                 break;
 274                         }
 275                         break;
 276                 case DH6OPT_ORO:
 277                         if (optlen % 2) {
 278                                 printf(" ?)");
 279                                 break;
 280                         }
 281                         tp = (u_char *)(dh6o + 1);
 282                         for (i = 0; i < optlen; i += 2) {
 283                                 u_int16_t opt;
 284
 285                                 memcpy(&opt, &tp[i], sizeof(opt));
 286                                 printf(" %s", dhcp6opt_name(ntohs(opt)));
 287                         }
 288                         printf(")");
 289                         break;
 290                 case DH6OPT_PREFERENCE:
 291                         if (optlen != 1) {
 292                                 printf(" ?)");
 293                                 break;
 294                         }
 295                         printf(" %d)", *((u_char *)(dh6o + 1) + 1));
 296                         break;
 297                 case DH6OPT_RAPID_COMMIT: /* nothing todo */
 298                         printf(")");
 299                         break;
 300                 case DH6OPT_DNS:
 301                         if (optlen % 16) {
 302                                 printf(" ?)");
 303                                 break;
 304                         }
 305                         tp = (u_char *)(dh6o + 1);
 306                         for (i = 0; i < optlen; i += 16)
 307                                 printf(" %s", ip6addr_string(&tp[i]));
 308                         printf(")");
 309                         break;
 310                 case DH6OPT_PREFIX_DELEGATION:
 311                         dhcp6opt_print((u_char *)(dh6o + 1),
 312                             (u_char *)(dh6o + 1) + optlen);
 313                         printf(")");
 314                         break;
 315                 case DH6OPT_PREFIX_INFORMATION:
 316                         if (optlen % 21)
 317                                 printf(" ?)");
 318                         memcpy(&addr6, (u_char *)(dh6o + 1) + 5,
 319                             sizeof(addr6));
 320                         printf(" %s/%d", ip6addr_string(&addr6),
 321                             (int)*((u_char *)(dh6o + 1) + 4));
 322                         memcpy(&val32, dh6o + 1, sizeof(val32));
 323                         val32 = ntohl(val32);
 324                         if (val32 == DHCP6_DURATITION_INFINITE)
 325                                 printf(" lease-duration: infinite)");
 326                         else
 327                                 printf(" lease-duration: %u)", val32);
 328                         break;
 329                 case DH6OPT_STATUS_CODE:
 330                         if (optlen < 2)
 331                                 printf(" ?)");
 332                         memcpy(&val16, (u_char *)(dh6o + 1), sizeof(val16));
 333                         val16 = ntohs(val16);
 334                         printf(" %s)", dhcp6stcode(val16));
 335                         break;
 336                 default:
 337                         printf(")");
 338                         break;
 339                 }
 340
 341                 cp += sizeof(*dh6o) + optlen;
 342         }
 343         return;
 344
 345 trunc:
 346         printf("[|dhcp6ext]");
 347 }
 348
 349 /*
 350  * Print dhcp6 packets
 351  */
 352 void
 353 dhcp6_print(register const u_char *cp, u_int length,
 354             u_int16_t sport, u_int16_t dport)
 355 {
 356         struct dhcp6 *dh6;
 357         u_char *ep;
 358         u_char *extp;
 359         const char *name;
 360
 361         printf("dhcp6");
 362
 363         ep = (u_char *)snapend;
 364
 365         dh6 = (struct dhcp6 *)cp;
 366         TCHECK(dh6->dh6_xid);
 367         switch (dh6->dh6_msgtype) {
 368         case DH6_SOLICIT:
 369                 name = "solicit";
 370                 break;
 371         case DH6_ADVERTISE:
 372                 name = "advertise";
 373                 break;
 374         case DH6_REQUEST:
 375                 name = "request";
 376                 break;
 377         case DH6_CONFIRM:
 378                 name = "confirm";
 379                 break;
 380         case DH6_RENEW:
 381                 name = "renew";
 382                 break;
 383         case DH6_REBIND:
 384                 name = "rebind";
 385                 break;
 386         case DH6_REPLY:
 387                 name = "reply";
 388                 break;
 389         case DH6_INFORM_REQ:
 390                 name= "inf-req";
 391                 break;
 392         default:
 393                 name = NULL;
 394                 break;
 395         }
 396
 397         if (!vflag) {
 398                 if (name)
 399                         printf(" %s", name);
 400                 else
 401                         printf(" msgtype-%u", dh6->dh6_msgtype);
 402                 return;
 403         }
 404
 405         /* XXX relay agent messages have to be handled differently */
 406
 407         if (name)
 408                 printf(" %s (", name);  /*)*/
 409         else
 410                 printf(" msgtype-%u (", dh6->dh6_msgtype);      /*)*/
 411         printf("xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK);
 412         extp = (u_char *)(dh6 + 1);
 413         dhcp6opt_print(extp, ep);
 414         /*(*/
 415         printf(")");
 416         return;
 417
 418 trunc:
 419         printf("[|dhcp6]");
 420 }