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 1.20 2002-06-15 02:49:54 itojun Exp $";
  36 #endif
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include "config.h"
  40 #endif
  41
  42 #include <sys/param.h>
  43 #include <sys/time.h>
  44 #include <sys/socket.h>
  45
  46 #include <netinet/in.h>
  47
  48 #include <ctype.h>
  49 #include <stdio.h>
  50 #include <string.h>
  51 #include <arpa/inet.h>
  52
  53 #include "interface.h"
  54 #include "addrtoname.h"
  55
  56 /* lease duration */
  57 #define DHCP6_DURATITION_INFINITE 0xffffffff
  58
  59 /* Error Values */
  60 #define DH6ERR_FAILURE          16
  61 #define DH6ERR_AUTHFAIL         17
  62 #define DH6ERR_POORLYFORMED     18
  63 #define DH6ERR_UNAVAIL          19
  64 #define DH6ERR_OPTUNAVAIL       20
  65
  66 /* Message type */
  67 #define DH6_SOLICIT     1
  68 #define DH6_ADVERTISE   2
  69 #define DH6_REQUEST     3
  70 #define DH6_CONFIRM     4
  71 #define DH6_RENEW       5
  72 #define DH6_REBIND      6
  73 #define DH6_REPLY       7
  74 #define DH6_INFORM_REQ  11
  75
  76 /* DHCP6 base packet format */
  77 struct dhcp6 {
  78         union {
  79                 u_int8_t m;
  80                 u_int32_t x;
  81         } dh6_msgtypexid;
  82         /* options follow */
  83 } __attribute__ ((__packed__));
  84 #define dh6_msgtype     dh6_msgtypexid.m
  85 #define dh6_xid         dh6_msgtypexid.x
  86 #define DH6_XIDMASK     0x00ffffff
  87
  88 /* option */
  89 #define DH6OPT_CLIENTID 1
  90 #define DH6OPT_SERVERID 2
  91 #define DH6OPT_IA 3
  92 #define DH6OPT_IA_TMP 4
  93 #define DH6OPT_IADDR 5
  94 #define DH6OPT_ORO 6
  95 #define DH6OPT_PREFERENCE 7
  96 #  define DH6OPT_PREF_UNDEF -1
  97 #  define DH6OPT_PREF_MAX 255
  98 #define DH6OPT_ELAPSED_TIME 8
  99 #define DH6OPT_CLIENT_MSG 9
 100 #define DH6OPT_SERVER_MSG 10
 101 #define DH6OPT_AUTH 11
 102 #define DH6OPT_UNICAST 12
 103 #define DH6OPT_STATUS_CODE 13
 104 #  define DH6OPT_STCODE_SUCCESS 0
 105 #  define DH6OPT_STCODE_UNSPECFAIL 1
 106 #  define DH6OPT_STCODE_AUTHFAILED 2
 107 #  define DH6OPT_STCODE_ADDRUNAVAIL 3
 108 #  define DH6OPT_STCODE_NOADDRAVAIL 4
 109 #  define DH6OPT_STCODE_NOBINDING 5
 110 #  define DH6OPT_STCODE_CONFNOMATCH 6
 111 #  define DH6OPT_STCODE_NOTONLINK 7
 112 #  define DH6OPT_STCODE_USEMULTICAST 8
 113 #define DH6OPT_RAPID_COMMIT 14
 114 #define DH6OPT_USER_CLASS 15
 115 #define DH6OPT_VENDOR_CLASS 16
 116 #define DH6OPT_VENDOR_OPTS 17
 117 #define DH6OPT_INTERFACE_ID 18
 118 #define DH6OPT_RECONF_MSG 19
 119
 120 /*
 121  * The option type has not been assigned for the following options.
 122  * We temporarily adopt values used in the service specification document
 123  * (200206xx version) by NTT Communications.
 124  * Note that we'll change the following definitions if different type values
 125  * are officially assigned.
 126  */
 127 #define DH6OPT_DNS 25
 128 #define DH6OPT_PREFIX_DELEGATION 30
 129 #define DH6OPT_PREFIX_INFORMATION 31
 130 #define DH6OPT_PREFIX_REQUEST 32
 131
 132 struct dhcp6opt {
 133         u_int16_t dh6opt_type;
 134         u_int16_t dh6opt_len;
 135         /* type-dependent data follows */
 136 } __attribute__ ((__packed__));
 137
 138 static char *
 139 dhcp6opt_name(int type)
 140 {
 141         static char genstr[sizeof("opt_65535") + 1]; /* XXX thread unsafe */
 142
 143         if (type > 65535)
 144                 return "INVALID option";
 145
 146         switch(type) {
 147         case DH6OPT_CLIENTID:
 148                 return "client ID";
 149         case DH6OPT_SERVERID:
 150                 return "server ID";
 151         case DH6OPT_ORO:
 152                 return "option request";
 153         case DH6OPT_PREFERENCE:
 154                 return "preference";
 155         case DH6OPT_STATUS_CODE:
 156                 return "status code";
 157         case DH6OPT_RAPID_COMMIT:
 158                 return "rapid commit";
 159         case DH6OPT_DNS:
 160                 return "DNS";
 161         case DH6OPT_PREFIX_DELEGATION:
 162                 return "prefix delegation";
 163         case DH6OPT_PREFIX_INFORMATION:
 164                 return "prefix information";
 165         default:
 166                 sprintf(genstr, "opt_%d", type);
 167                 return(genstr);
 168         }
 169 }
 170
 171 static char *
 172 dhcp6stcode(int code)
 173 {
 174         static char genstr[sizeof("code255") + 1]; /* XXX thread unsafe */
 175
 176         if (code > 255)
 177                 return "INVALID code";
 178
 179         switch(code) {
 180         case DH6OPT_STCODE_SUCCESS:
 181                 return "success";
 182         case DH6OPT_STCODE_UNSPECFAIL:
 183                 return "unspec failure";
 184         case DH6OPT_STCODE_AUTHFAILED:
 185                 return "auth fail";
 186         case DH6OPT_STCODE_ADDRUNAVAIL:
 187                 return "address unavailable";
 188         case DH6OPT_STCODE_NOADDRAVAIL:
 189                 return "no addresses";
 190         case DH6OPT_STCODE_NOBINDING:
 191                 return "no binding";
 192         case DH6OPT_STCODE_CONFNOMATCH:
 193                 return "confirm no match";
 194         case DH6OPT_STCODE_NOTONLINK:
 195                 return "not on-link";
 196         case DH6OPT_STCODE_USEMULTICAST:
 197                 return "use multicast";
 198         default:
 199                 sprintf(genstr, "code%d", code);
 200                 return(genstr);
 201         }
 202 }
 203
 204 static void
 205 dhcp6opt_print(u_char *cp, u_char *ep)
 206 {
 207         struct dhcp6opt *dh6o;
 208         u_char *tp;
 209         int i, opttype;
 210         size_t optlen;
 211         u_int16_t val16;
 212         u_int32_t val32;
 213         struct in6_addr addr6;
 214
 215         if (cp == ep)
 216                 return;
 217         while (cp < ep) {
 218                 if (ep - cp < sizeof(*dh6o))
 219                         goto trunc;
 220                 dh6o = (struct dhcp6opt *)cp;
 221                 optlen = ntohs(dh6o->dh6opt_len);
 222                 if (ep - cp < sizeof(*dh6o) + optlen)
 223                         goto trunc;
 224                 opttype = ntohs(dh6o->dh6opt_type);
 225                 printf(" (%s", dhcp6opt_name(opttype));
 226                 switch (opttype) {
 227                 case DH6OPT_CLIENTID:
 228                 case DH6OPT_SERVERID:
 229                         if (optlen < 2) {
 230                                 /*(*/
 231                                 printf(" ?)");
 232                                 break;
 233                         }
 234                         tp = (u_char *)(dh6o + 1);
 235                         switch (ntohs(*(u_int16_t *)tp)) {
 236                         case 1:
 237                                 if (optlen >= 2 + 6) {
 238                                         printf(" hwaddr/time type %u time %u ",
 239                                             ntohs(*(u_int16_t *)&tp[2]),
 240                                             ntohl(*(u_int32_t *)&tp[4]));
 241                                         for (i = 8; i < optlen; i++)
 242                                                 printf("%02x", tp[i]);
 243                                         /*(*/
 244                                         printf(")");
 245                                 } else {
 246                                         /*(*/
 247                                         printf(" ?)");
 248                                 }
 249                                 break;
 250                         case 2:
 251                                 if (optlen >= 2 + 8) {
 252                                         printf(" vid ");
 253                                         for (i = 2; i < 2 + 8; i++)
 254                                                 printf("%02x", tp[i]);
 255                                         /*(*/
 256                                         printf(")");
 257                                 } else {
 258                                         /*(*/
 259                                         printf(" ?)");
 260                                 }
 261                                 break;
 262                         case 3:
 263                                 if (optlen >= 2 + 2) {
 264                                         printf(" hwaddr type %u ",
 265                                             ntohs(*(u_int16_t *)&tp[2]));
 266                                         for (i = 4; i < optlen; i++)
 267                                                 printf("%02x", tp[i]);
 268                                         /*(*/
 269                                         printf(")");
 270                                 } else {
 271                                         /*(*/
 272                                         printf(" ?)");
 273                                 }
 274                                 break;
 275                         default:
 276                                 printf(" type %d)", ntohs(*(u_int16_t *)tp));
 277                                 break;
 278                         }
 279                         break;
 280                 case DH6OPT_ORO:
 281                         if (optlen % 2) {
 282                                 printf(" ?)");
 283                                 break;
 284                         }
 285                         tp = (u_char *)(dh6o + 1);
 286                         for (i = 0; i < optlen; i += 2) {
 287                                 u_int16_t opt;
 288
 289                                 memcpy(&opt, &tp[i], sizeof(opt));
 290                                 printf(" %s", dhcp6opt_name(ntohs(opt)));
 291                         }
 292                         printf(")");
 293                         break;
 294                 case DH6OPT_PREFERENCE:
 295                         if (optlen != 1) {
 296                                 printf(" ?)");
 297                                 break;
 298                         }
 299                         printf(" %d)", *((u_char *)(dh6o + 1) + 1));
 300                         break;
 301                 case DH6OPT_RAPID_COMMIT: /* nothing todo */
 302                         printf(")");
 303                         break;
 304                 case DH6OPT_DNS:
 305                         if (optlen % 16) {
 306                                 printf(" ?)");
 307                                 break;
 308                         }
 309                         tp = (u_char *)(dh6o + 1);
 310                         for (i = 0; i < optlen; i += 16)
 311                                 printf(" %s", ip6addr_string(&tp[i]));
 312                         printf(")");
 313                         break;
 314                 case DH6OPT_PREFIX_DELEGATION:
 315                         dhcp6opt_print((u_char *)(dh6o + 1),
 316                             (u_char *)(dh6o + 1) + optlen);
 317                         printf(")");
 318                         break;
 319                 case DH6OPT_PREFIX_INFORMATION:
 320                         if (optlen % 21)
 321                                 printf(" ?)");
 322                         memcpy(&addr6, (u_char *)(dh6o + 1) + 5,
 323                             sizeof(addr6));
 324                         printf(" %s/%d", ip6addr_string(&addr6),
 325                             (int)*((u_char *)(dh6o + 1) + 4));
 326                         memcpy(&val32, dh6o + 1, sizeof(val32));
 327                         val32 = ntohl(val32);
 328                         if (val32 == DHCP6_DURATITION_INFINITE)
 329                                 printf(" lease-duration: infinite)");
 330                         else
 331                                 printf(" lease-duration: %u)", val32);
 332                         break;
 333                 case DH6OPT_STATUS_CODE:
 334                         if (optlen < 2)
 335                                 printf(" ?)");
 336                         memcpy(&val16, (u_char *)(dh6o + 1), sizeof(val16));
 337                         val16 = ntohs(val16);
 338                         printf(" %s)", dhcp6stcode(val16));
 339                         break;
 340                 default:
 341                         printf(")", ntohs(dh6o->dh6opt_type));
 342                         break;
 343                 }
 344
 345                 cp += sizeof(*dh6o) + optlen;
 346         }
 347         return;
 348
 349 trunc:
 350         printf("[|dhcp6ext]");
 351 }
 352
 353 /*
 354  * Print dhcp6 packets
 355  */
 356 void
 357 dhcp6_print(register const u_char *cp, u_int length,
 358             u_int16_t sport, u_int16_t dport)
 359 {
 360         struct dhcp6 *dh6;
 361         u_char *ep;
 362         u_char *extp;
 363         const char *name;
 364
 365         printf("dhcp6");
 366
 367         ep = (u_char *)snapend;
 368
 369         dh6 = (struct dhcp6 *)cp;
 370         TCHECK(dh6->dh6_xid);
 371         switch (dh6->dh6_msgtype) {
 372         case DH6_SOLICIT:
 373                 name = "solicit";
 374                 break;
 375         case DH6_ADVERTISE:
 376                 name = "advertise";
 377                 break;
 378         case DH6_REQUEST:
 379                 name = "request";
 380                 break;
 381         case DH6_CONFIRM:
 382                 name = "confirm";
 383                 break;
 384         case DH6_RENEW:
 385                 name = "renew";
 386                 break;
 387         case DH6_REBIND:
 388                 name = "rebind";
 389                 break;
 390         case DH6_REPLY:
 391                 name = "reply";
 392                 break;
 393         case DH6_INFORM_REQ:
 394                 name= "inf-req";
 395                 break;
 396         default:
 397                 name = NULL;
 398                 break;
 399         }
 400
 401         if (!vflag) {
 402                 if (name)
 403                         printf(" %s", name);
 404                 else
 405                         printf(" msgtype-%u", dh6->dh6_msgtype);
 406                 return;
 407         }
 408
 409         /* XXX relay agent messages have to be handled differently */
 410
 411         if (name)
 412                 printf(" %s (", name);  /*)*/
 413         else
 414                 printf(" msgtype-%u (", dh6->dh6_msgtype);      /*)*/
 415         printf("xid=%x", ntohl(dh6->dh6_xid) & DH6_XIDMASK);
 416         extp = (u_char *)(dh6 + 1);
 417         dhcp6opt_print(extp, ep);
 418         /*(*/
 419         printf(")");
 420         return;
 421
 422 trunc:
 423         printf("[|dhcp6]");
 424 }