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 1.21 2002-08-01 08:53:04 risso 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
  50 /* lease duration */
  51 #define DHCP6_DURATITION_INFINITE 0xffffffff
  52
  53 /* Error Values */
  54 #define DH6ERR_FAILURE          16
  55 #define DH6ERR_AUTHFAIL         17
  56 #define DH6ERR_POORLYFORMED     18
  57 #define DH6ERR_UNAVAIL          19
  58 #define DH6ERR_OPTUNAVAIL       20
  59
  60 /* Message type */
  61 #define DH6_SOLICIT     1
  62 #define DH6_ADVERTISE   2
  63 #define DH6_REQUEST     3
  64 #define DH6_CONFIRM     4
  65 #define DH6_RENEW       5
  66 #define DH6_REBIND      6
  67 #define DH6_REPLY       7
  68 #define DH6_INFORM_REQ  11
  69
  70 /* DHCP6 base packet format */
  71 struct dhcp6 {
  72         union {
  73                 u_int8_t m;
  74                 u_int32_t x;
  75         } dh6_msgtypexid;
  76         /* options follow */
  77 } __attribute__ ((__packed__));
  78 #define dh6_msgtype     dh6_msgtypexid.m
  79 #define dh6_xid         dh6_msgtypexid.x
  80 #define DH6_XIDMASK     0x00ffffff
  81
  82 /* option */
  83 #define DH6OPT_CLIENTID 1
  84 #define DH6OPT_SERVERID 2
  85 #define DH6OPT_IA 3
  86 #define DH6OPT_IA_TMP 4
  87 #define DH6OPT_IADDR 5
  88 #define DH6OPT_ORO 6
  89 #define DH6OPT_PREFERENCE 7
  90 #  define DH6OPT_PREF_UNDEF -1
  91 #  define DH6OPT_PREF_MAX 255
  92 #define DH6OPT_ELAPSED_TIME 8
  93 #define DH6OPT_CLIENT_MSG 9
  94 #define DH6OPT_SERVER_MSG 10
  95 #define DH6OPT_AUTH 11
  96 #define DH6OPT_UNICAST 12
  97 #define DH6OPT_STATUS_CODE 13
  98 #  define DH6OPT_STCODE_SUCCESS 0
  99 #  define DH6OPT_STCODE_UNSPECFAIL 1
 100 #  define DH6OPT_STCODE_AUTHFAILED 2
 101 #  define DH6OPT_STCODE_ADDRUNAVAIL 3
 102 #  define DH6OPT_STCODE_NOADDRAVAIL 4
 103 #  define DH6OPT_STCODE_NOBINDING 5
 104 #  define DH6OPT_STCODE_CONFNOMATCH 6
 105 #  define DH6OPT_STCODE_NOTONLINK 7
 106 #  define DH6OPT_STCODE_USEMULTICAST 8
 107 #define DH6OPT_RAPID_COMMIT 14
 108 #define DH6OPT_USER_CLASS 15
 109 #define DH6OPT_VENDOR_CLASS 16
 110 #define DH6OPT_VENDOR_OPTS 17
 111 #define DH6OPT_INTERFACE_ID 18
 112 #define DH6OPT_RECONF_MSG 19
 113
 114 /*
 115  * The option type has not been assigned for the following options.
 116  * We temporarily adopt values used in the service specification document
 117  * (200206xx version) by NTT Communications.
 118  * Note that we'll change the following definitions if different type values
 119  * are officially assigned.
 120  */
 121 #define DH6OPT_DNS 25
 122 #define DH6OPT_PREFIX_DELEGATION 30
 123 #define DH6OPT_PREFIX_INFORMATION 31
 124 #define DH6OPT_PREFIX_REQUEST 32
 125
 126 struct dhcp6opt {
 127         u_int16_t dh6opt_type;
 128         u_int16_t dh6opt_len;
 129         /* type-dependent data follows */
 130 } __attribute__ ((__packed__));
 131
 132 static char *
 133 dhcp6opt_name(int type)
 134 {
 135         static char genstr[sizeof("opt_65535") + 1]; /* XXX thread unsafe */
 136
 137         if (type > 65535)
 138                 return "INVALID option";
 139
 140         switch(type) {
 141         case DH6OPT_CLIENTID:
 142                 return "client ID";
 143         case DH6OPT_SERVERID:
 144                 return "server ID";
 145         case DH6OPT_ORO:
 146                 return "option request";
 147         case DH6OPT_PREFERENCE:
 148                 return "preference";
 149         case DH6OPT_STATUS_CODE:
 150                 return "status code";
 151         case DH6OPT_RAPID_COMMIT:
 152                 return "rapid commit";
 153         case DH6OPT_DNS:
 154                 return "DNS";
 155         case DH6OPT_PREFIX_DELEGATION:
 156                 return "prefix delegation";
 157         case DH6OPT_PREFIX_INFORMATION:
 158                 return "prefix information";
 159         default:
 160                 sprintf(genstr, "opt_%d", type);
 161                 return(genstr);
 162         }
 163 }
 164
 165 static char *
 166 dhcp6stcode(int code)
 167 {
 168         static char genstr[sizeof("code255") + 1]; /* XXX thread unsafe */
 169
 170         if (code > 255)
 171                 return "INVALID code";
 172
 173         switch(code) {
 174         case DH6OPT_STCODE_SUCCESS:
 175                 return "success";
 176         case DH6OPT_STCODE_UNSPECFAIL:
 177                 return "unspec failure";
 178         case DH6OPT_STCODE_AUTHFAILED:
 179                 return "auth fail";
 180         case DH6OPT_STCODE_ADDRUNAVAIL:
 181                 return "address unavailable";
 182         case DH6OPT_STCODE_NOADDRAVAIL:
 183                 return "no addresses";
 184         case DH6OPT_STCODE_NOBINDING:
 185                 return "no binding";
 186         case DH6OPT_STCODE_CONFNOMATCH:
 187                 return "confirm no match";
 188         case DH6OPT_STCODE_NOTONLINK:
 189                 return "not on-link";
 190         case DH6OPT_STCODE_USEMULTICAST:
 191                 return "use multicast";
 192         default:
 193                 sprintf(genstr, "code%d", code);
 194                 return(genstr);
 195         }
 196 }
 197
 198 static void
 199 dhcp6opt_print(u_char *cp, u_char *ep)
 200 {
 201         struct dhcp6opt *dh6o;
 202         u_char *tp;
 203         int i, opttype;
 204         size_t optlen;
 205         u_int16_t val16;
 206         u_int32_t val32;
 207         struct in6_addr addr6;
 208
 209         if (cp == ep)
 210                 return;
 211         while (cp < ep) {
 212                 if (ep - cp < sizeof(*dh6o))
 213                         goto trunc;
 214                 dh6o = (struct dhcp6opt *)cp;
 215                 optlen = ntohs(dh6o->dh6opt_len);
 216                 if (ep - cp < sizeof(*dh6o) + optlen)
 217                         goto trunc;
 218                 opttype = ntohs(dh6o->dh6opt_type);
 219                 printf(" (%s", dhcp6opt_name(opttype));
 220                 switch (opttype) {
 221                 case DH6OPT_CLIENTID:
 222                 case DH6OPT_SERVERID:
 223                         if (optlen < 2) {
 224                                 /*(*/
 225                                 printf(" ?)");
 226                                 break;
 227                         }
 228                         tp = (u_char *)(dh6o + 1);
 229                         switch (ntohs(*(u_int16_t *)tp)) {
 230                         case 1:
 231                                 if (optlen >= 2 + 6) {
 232                                         printf(" hwaddr/time type %u time %u ",
 233                                             ntohs(*(u_int16_t *)&tp[2]),
 234                                             ntohl(*(u_int32_t *)&tp[4]));
 235                                         for (i = 8; i < optlen; i++)
 236                                                 printf("%02x", tp[i]);
 237                                         /*(*/
 238                                         printf(")");
 239                                 } else {
 240                                         /*(*/
 241                                         printf(" ?)");
 242                                 }
 243                                 break;
 244                         case 2:
 245                                 if (optlen >= 2 + 8) {
 246                                         printf(" vid ");
 247                                         for (i = 2; i < 2 + 8; i++)
 248                                                 printf("%02x", tp[i]);
 249                                         /*(*/
 250                                         printf(")");
 251                                 } else {
 252                                         /*(*/
 253                                         printf(" ?)");
 254                                 }
 255                                 break;
 256                         case 3:
 257                                 if (optlen >= 2 + 2) {
 258                                         printf(" hwaddr type %u ",
 259                                             ntohs(*(u_int16_t *)&tp[2]));
 260                                         for (i = 4; i < optlen; i++)
 261                                                 printf("%02x", tp[i]);
 262                                         /*(*/
 263                                         printf(")");
 264                                 } else {
 265                                         /*(*/
 266                                         printf(" ?)");
 267                                 }
 268                                 break;
 269                         default:
 270                                 printf(" type %d)", ntohs(*(u_int16_t *)tp));
 271                                 break;
 272                         }
 273                         break;
 274                 case DH6OPT_ORO:
 275                         if (optlen % 2) {
 276                                 printf(" ?)");
 277                                 break;
 278                         }
 279                         tp = (u_char *)(dh6o + 1);
 280                         for (i = 0; i < optlen; i += 2) {
 281                                 u_int16_t opt;
 282
 283                                 memcpy(&opt, &tp[i], sizeof(opt));
 284                                 printf(" %s", dhcp6opt_name(ntohs(opt)));
 285                         }
 286                         printf(")");
 287                         break;
 288                 case DH6OPT_PREFERENCE:
 289                         if (optlen != 1) {
 290                                 printf(" ?)");
 291                                 break;
 292                         }
 293                         printf(" %d)", *((u_char *)(dh6o + 1) + 1));
 294                         break;
 295                 case DH6OPT_RAPID_COMMIT: /* nothing todo */
 296                         printf(")");
 297                         break;
 298                 case DH6OPT_DNS:
 299                         if (optlen % 16) {
 300                                 printf(" ?)");
 301                                 break;
 302                         }
 303                         tp = (u_char *)(dh6o + 1);
 304                         for (i = 0; i < optlen; i += 16)
 305                                 printf(" %s", ip6addr_string(&tp[i]));
 306                         printf(")");
 307                         break;
 308                 case DH6OPT_PREFIX_DELEGATION:
 309                         dhcp6opt_print((u_char *)(dh6o + 1),
 310                             (u_char *)(dh6o + 1) + optlen);
 311                         printf(")");
 312                         break;
 313                 case DH6OPT_PREFIX_INFORMATION:
 314                         if (optlen % 21)
 315                                 printf(" ?)");
 316                         memcpy(&addr6, (u_char *)(dh6o + 1) + 5,
 317                             sizeof(addr6));
 318                         printf(" %s/%d", ip6addr_string(&addr6),
 319                             (int)*((u_char *)(dh6o + 1) + 4));
 320                         memcpy(&val32, dh6o + 1, sizeof(val32));
 321                         val32 = ntohl(val32);
 322                         if (val32 == DHCP6_DURATITION_INFINITE)
 323                                 printf(" lease-duration: infinite)");
 324                         else
 325                                 printf(" lease-duration: %u)", val32);
 326                         break;
 327                 case DH6OPT_STATUS_CODE:
 328                         if (optlen < 2)
 329                                 printf(" ?)");
 330                         memcpy(&val16, (u_char *)(dh6o + 1), sizeof(val16));
 331                         val16 = ntohs(val16);
 332                         printf(" %s)", dhcp6stcode(val16));
 333                         break;
 334                 default:
 335                         printf(")", ntohs(dh6o->dh6opt_type));
 336                         break;
 337                 }
 338
 339                 cp += sizeof(*dh6o) + optlen;
 340         }
 341         return;
 342
 343 trunc:
 344         printf("[|dhcp6ext]");
 345 }
 346
 347 /*
 348  * Print dhcp6 packets
 349  */
 350 void
 351 dhcp6_print(register const u_char *cp, u_int length,
 352             u_int16_t sport, u_int16_t dport)
 353 {
 354         struct dhcp6 *dh6;
 355         u_char *ep;
 356         u_char *extp;
 357         const char *name;
 358
 359         printf("dhcp6");
 360
 361         ep = (u_char *)snapend;
 362
 363         dh6 = (struct dhcp6 *)cp;
 364         TCHECK(dh6->dh6_xid);
 365         switch (dh6->dh6_msgtype) {
 366         case DH6_SOLICIT:
 367                 name = "solicit";
 368                 break;
 369         case DH6_ADVERTISE:
 370                 name = "advertise";
 371                 break;
 372         case DH6_REQUEST:
 373                 name = "request";
 374                 break;
 375         case DH6_CONFIRM:
 376                 name = "confirm";
 377                 break;
 378         case DH6_RENEW:
 379                 name = "renew";
 380                 break;
 381         case DH6_REBIND:
 382                 name = "rebind";
 383                 break;
 384         case DH6_REPLY:
 385                 name = "reply";
 386                 break;
 387         case DH6_INFORM_REQ:
 388                 name= "inf-req";
 389                 break;
 390         default:
 391                 name = NULL;
 392                 break;
 393         }
 394
 395         if (!vflag) {
 396                 if (name)
 397                         printf(" %s", name);
 398                 else
 399                         printf(" msgtype-%u", dh6->dh6_msgtype);
 400                 return;
 401         }
 402
 403         /* XXX relay agent messages have to be handled differently */
 404
 405         if (name)
 406                 printf(" %s (", name);  /*)*/
 407         else
 408                 printf(" msgtype-%u (", dh6->dh6_msgtype);      /*)*/
 409         printf("xid=%x", ntohl(dh6->dh6_xid) & DH6_XIDMASK);
 410         extp = (u_char *)(dh6 + 1);
 411         dhcp6opt_print(extp, ep);
 412         /*(*/
 413         printf(")");
 414         return;
 415
 416 trunc:
 417         printf("[|dhcp6]");
 418 }