packet-wtp.c

   1 /* packet-wtp.c
   2  *
   3  * Routines to dissect WTP component of WAP traffic.
   4  *
   5  * $Id: packet-wtp.c,v 1.19 2001/09/11 14:36:31 guy Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@zing.org>
   9  * Copyright 1998 Didier Jorand
  10  *
  11  * WAP dissector based on original work by Ben Fowler
  12  * Updated by Neil Hunter <neil.hunter@energis-squared.com>
  13  * WTLS support by Alexandre P. Ferreira (Splice IP)
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36
  37 #ifdef HAVE_SYS_TYPES_H
  38 # include <sys/types.h>
  39 #endif
  40
  41 #ifdef HAVE_NETINET_IN_H
  42 # include <netinet/in.h>
  43 #endif
  44
  45 #ifdef NEED_SNPRINTF_H
  46 # ifdef HAVE_STDARG_H
  47 #  include <stdarg.h>
  48 # else
  49 #  include <varargs.h>
  50 # endif
  51 # include "snprintf.h"
  52 #endif
  53
  54 #include <string.h>
  55 #include <glib.h>
  56 #include "packet.h"
  57 #include "packet-wap.h"
  58 #include "packet-wtp.h"
  59 #include "packet-wsp.h"
  60
  61 static const true_false_string continue_truth = {
  62         "TPI Present" ,
  63         "No TPI"
  64 };
  65
  66 static const true_false_string RID_truth = {
  67         "Re-Transmission",
  68         "First transmission"
  69 };
  70
  71 static const true_false_string TIDNew_truth = {
  72         "TID is new" ,
  73         "TID is valid"
  74 };
  75
  76 static const true_false_string tid_response_truth = {
  77         "Response" ,
  78         "Original"
  79 };
  80
  81 static const true_false_string UP_truth = {
  82         "User Acknowledgement required" ,
  83         "User Acknowledgement optional"
  84 };
  85
  86 static const true_false_string TVETOK_truth = {
  87         "True",
  88         "False"
  89 };
  90
  91 static const value_string vals_pdu_type[] = {
  92         { 0, "Not Allowed" },
  93         { 1, "Invoke" },
  94         { 2, "Result" },
  95         { 3, "Ack" },
  96         { 4, "Abort" },
  97         { 5, "Segmented Invoke" },
  98         { 6, "Segmented Result" },
  99         { 7, "Negative Ack" },
 100         { 0, NULL }
 101 };
 102
 103 static const value_string vals_transaction_trailer[] = {
 104         { 0, "Not last packet" },
 105         { 1, "Last packet of message" },
 106         { 2, "Last packet of group" },
 107         { 3, "Re-assembly not supported" },
 108         { 0, NULL }
 109 };
 110
 111 static const value_string vals_version[] = {
 112         { 0, "Current" },
 113         { 1, "Undefined" },
 114         { 2, "Undefined" },
 115         { 3, "Undefined" },
 116         { 0, NULL }
 117 };
 118
 119 static const value_string vals_abort_type[] = {
 120         { 0, "Provider" },
 121         { 1, "User (WSP)" },
 122         { 0, NULL }
 123 };
 124
 125 static const value_string vals_abort_reason_provider[] = {
 126         { 0x00, "Unknown" },
 127         { 0x01, "Protocol Error" },
 128         { 0x02, "Invalid TID" },
 129         { 0x03, "Not Implemented Class 2" },
 130         { 0x04, "Not Implemented SAR" },
 131         { 0x05, "Not Implemented User Acknowledgement" },
 132         { 0x06, "WTP Version Zero" },
 133         { 0x07, "Capacity Temporarily Exceeded" },
 134         { 0x08, "No Response" },
 135         { 0x09, "Message Too Large" },
 136         { 0x00, NULL }
 137 };
 138
 139 static const value_string vals_transaction_classes[] = {
 140         { 0x00, "Unreliable Invoke without Result" },
 141         { 0x01, "Reliable Invoke without Result" },
 142         { 0x02, "Reliable Invoke with Reliable Result" },
 143         { 0x00, NULL }
 144 };
 145
 146 /* File scoped variables for the protocol and registered fields */
 147 static int proto_wtp                                                    = HF_EMPTY;
 148
 149 /* These fields used by fixed part of header */
 150 static int hf_wtp_header_fixed_part                     = HF_EMPTY;
 151 static int hf_wtp_header_flag_continue                  = HF_EMPTY;
 152 static int hf_wtp_header_pdu_type                               = HF_EMPTY;
 153 static int hf_wtp_header_flag_Trailer                   = HF_EMPTY;
 154 static int hf_wtp_header_flag_RID                               = HF_EMPTY;
 155 static int hf_wtp_header_flag_TID                               = HF_EMPTY;
 156 static int hf_wtp_header_flag_TID_response              = HF_EMPTY;
 157
 158 /* These fields used by Invoke packets */
 159 static int hf_wtp_header_Inv_version                    = HF_EMPTY;
 160 static int hf_wtp_header_Inv_flag_TIDNew                = HF_EMPTY;
 161 static int hf_wtp_header_Inv_flag_UP                    = HF_EMPTY;
 162 static int hf_wtp_header_Inv_Reserved                   = HF_EMPTY;
 163 static int hf_wtp_header_Inv_TransactionClass   = HF_EMPTY;
 164
 165
 166 static int hf_wtp_header_variable_part                  = HF_EMPTY;
 167 static int hf_wtp_data                                                  = HF_EMPTY;
 168
 169 static int hf_wtp_header_Ack_flag_TVETOK                = HF_EMPTY;
 170 static int hf_wtp_header_Abort_type                             = HF_EMPTY;
 171 static int hf_wtp_header_Abort_reason_provider  = HF_EMPTY;
 172 static int hf_wtp_header_Abort_reason_user              = HF_EMPTY;
 173 static int hf_wtp_header_sequence_number                = HF_EMPTY;
 174 static int hf_wtp_header_missing_packets                = HF_EMPTY;
 175
 176 /* Initialize the subtree pointers */
 177 static gint ett_wtp                                                     = ETT_EMPTY;
 178 static gint ett_header                                                  = ETT_EMPTY;
 179
 180 /* Handle for WSP dissector */
 181 static dissector_handle_t wsp_handle;
 182
 183 /* Declarations */
 184 static char transaction_class(unsigned char octet);
 185 static char pdu_type(unsigned char octet);
 186 static char retransmission_indicator(unsigned char octet);
 187
 188 /* Code to actually dissect the packets */
 189 static void
 190 dissect_wtp_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 191 {
 192         frame_data *fdata = pinfo->fd;
 193
 194         char szInfo[ 50 ];
 195         int offCur                      = 0; /* current offset from start of WTP data */
 196
 197         /* bytes at offset 0 - 3 */
 198         /*
 199         unsigned char  b0 = pd[offset + 0];
 200         unsigned char  b3 = pd[offset + 3];
 201         */
 202         unsigned char  b0;
 203
 204         /* continuation flag */
 205         unsigned char   fCon;
 206         unsigned char   fRID;
 207         guint           cbHeader        = 0;
 208         guint           vHeader         = 0;
 209         int             abortType       = 0;
 210
 211 /* Set up structures we will need to add the protocol subtree and manage it */
 212         proto_item *ti;
 213         proto_tree *wtp_tree;
 214         proto_tree *wtp_header_fixed;
 215
 216         char pdut;
 217         char clsTransaction             = ' ';
 218         int cchInfo;
 219         int numMissing = 0;             /* Number of missing packets in a negative ack */
 220         int i;
 221         tvbuff_t *wsp_tvb = NULL;
 222
 223 #ifdef DEBUG
 224         fprintf( stderr, "dissect_wtp: (Entering) Frame data at %p\n", fdata );
 225         fprintf( stderr, "dissect_wtp: tvb length is %d\n", tvb_reported_length( tvb ) );
 226 #endif
 227         if (check_col(fdata, COL_INFO)) {
 228                 col_clear(fdata, COL_INFO);
 229         };
 230
 231         b0 = tvb_get_guint8 (tvb, offCur + 0);
 232         fCon = b0 & 0x80;
 233         fRID = retransmission_indicator( b0 );
 234         pdut = pdu_type( b0 );
 235
 236         /* Develop the string to put in the Info column */
 237         cchInfo = snprintf( szInfo, sizeof( szInfo ), "WTP %s",
 238             val_to_str(pdut, vals_pdu_type, "Unknown PDU type 0x%x"));
 239
 240         switch( pdut ) {
 241                 case INVOKE:
 242                         clsTransaction = transaction_class( tvb_get_guint8 (tvb, offCur + 3) );
 243                         snprintf( szInfo + cchInfo, sizeof( szInfo ) - cchInfo, " Class %d", clsTransaction  );
 244
 245                 case ABORT:
 246                 case SEGMENTED_INVOKE:
 247                 case SEGMENTED_RESULT:
 248                         cbHeader = 4;
 249                         break;
 250
 251                 case RESULT:
 252                 case ACK:
 253                         cbHeader = 3;
 254                         break;
 255
 256                 case NEGATIVE_ACK:
 257                         /* Varible number of missing packets */
 258                         numMissing = tvb_get_guint8 (tvb, offCur + 3);
 259                         cbHeader = numMissing + 4;
 260                         break;
 261
 262                 default:
 263                         break;
 264         };
 265
 266         if( fRID ) {
 267                 strcat( szInfo, " R" );
 268         };
 269         if( fCon ) {
 270                 unsigned char   tCon;
 271                 unsigned char   tByte;
 272
 273                 do {
 274                         tByte = tvb_get_guint8(tvb, offCur + cbHeader + vHeader);
 275                         tCon = tByte & 0x80;
 276                         if (tByte & 0x04)
 277                                 vHeader = vHeader + tvb_get_guint8(tvb,
 278                                         offCur + cbHeader + vHeader + 1) + 2;
 279                         else
 280                                 vHeader = vHeader + (tByte & 0x03) + 1;
 281                 } while (tCon);
 282         }
 283
 284 #ifdef DEBUG
 285         fprintf( stderr, "dissect_wtp: cbHeader = %d\n", cbHeader );
 286 #endif
 287
 288 /* This field shows up as the "Info" column in the display; you should make
 289    it, if possible, summarize what's in the packet, so that a user looking
 290    at the list of packets can tell what type of packet it is. */
 291         if (check_col(fdata, COL_INFO)) {
 292 #ifdef DEBUG
 293                 fprintf( stderr, "dissect_wtp: (6) About to set info_col header to %s\n", szInfo );
 294 #endif
 295                 col_add_str(fdata, COL_INFO, szInfo );
 296         };
 297 /* In the interest of speed, if "tree" is NULL, don't do any work not
 298    necessary to generate protocol tree items. */
 299         if (tree) {
 300 #ifdef DEBUG
 301                 fprintf( stderr, "dissect_wtp: cbHeader = %d\n", cbHeader );
 302 #endif
 303                 ti = proto_tree_add_item(tree, proto_wtp, tvb, offCur, cbHeader + vHeader, bo_little_endian);
 304 #ifdef DEBUG
 305                 fprintf( stderr, "dissect_wtp: (7) Returned from proto_tree_add_item\n" );
 306 #endif
 307                 wtp_tree = proto_item_add_subtree(ti, ett_wtp);
 308
 309 /* Code to process the packet goes here */
 310                 {
 311 #ifdef DEBUG
 312                         fprintf( stderr, "dissect_wtp: cbHeader = %d\n", cbHeader );
 313                         fprintf( stderr, "dissect_wtp: offCur = %d\n", offCur );
 314                         fprintf( stderr, "dissect_wtp: About to call proto_tree_add_item with %p %d %p %d %d %d\n",
 315                                         wtp_tree, hf_wtp_header_fixed_part, tvb, offCur, cbHeader, bo_little_endian );
 316                         ti = proto_tree_add_item( wtp_tree, hf_wtp_header_fixed_part, tvb, offCur, cbHeader, bo_little_endian );
 317                         fprintf( stderr, "dissect_wtp: (6) Returned from proto_tree_add_item\n" );
 318 #endif
 319                         wtp_header_fixed = proto_item_add_subtree(
 320                                         ti,
 321                                         ett_header
 322                                 );
 323
 324                         /* Add common items: only CON and PDU Type */
 325                         ti = proto_tree_add_item(
 326                                         wtp_header_fixed,               /* tree */
 327                                         hf_wtp_header_flag_continue,    /* id */
 328                                         tvb,
 329                                         offCur,                         /* start of high light */
 330                                         1,                              /* length of high light */
 331                                         b0                              /* value */
 332                              );
 333                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_pdu_type, tvb, offCur, 1, bo_little_endian );
 334
 335                         switch( pdut ) {
 336                                 case INVOKE:
 337                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian );
 338                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 339                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 340                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 341
 342                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Inv_version , tvb, offCur + 3, 1, bo_little_endian );
 343                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Inv_flag_TIDNew, tvb, offCur + 3, 1, bo_little_endian );
 344                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Inv_flag_UP, tvb, offCur + 3, 1, bo_little_endian );
 345                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Inv_Reserved, tvb, offCur + 3, 1, bo_little_endian );
 346                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Inv_TransactionClass, tvb, offCur + 3, 1, bo_little_endian );
 347                                         break;
 348
 349                                 case RESULT:
 350                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian );
 351                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 352                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 353                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 354                                         break;
 355
 356                                 case ACK:
 357                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Ack_flag_TVETOK, tvb, offCur, 1, bo_big_endian );
 358
 359                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 360                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 361                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 362                                         break;
 363
 364                                 case ABORT:
 365                                         abortType = tvb_get_guint8 (tvb, offCur) & 0x07;
 366                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Abort_type , tvb, offCur , 1, bo_little_endian );
 367                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 368                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 369
 370                                         if (abortType == PROVIDER)
 371                                         {
 372                                                 ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Abort_reason_provider , tvb, offCur + 3 , 1, bo_little_endian );
 373                                         }
 374                                         else if (abortType == USER)
 375                                         {
 376                                                 ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Abort_reason_user , tvb, offCur + 3 , 1, bo_little_endian );
 377                                         }
 378                                         break;
 379
 380                                 case SEGMENTED_INVOKE:
 381                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian );
 382                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 383                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 384                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 385
 386                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_sequence_number , tvb, offCur + 3, 1, bo_little_endian );
 387                                         break;
 388
 389                                 case SEGMENTED_RESULT:
 390                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian );
 391                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 392                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 393                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 394
 395                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_sequence_number , tvb, offCur + 3, 1, bo_little_endian );
 396                                         break;
 397
 398                                 case NEGATIVE_ACK:
 399                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 400                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 401                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 402
 403                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_missing_packets , tvb, offCur + 3, 1, bo_little_endian );
 404                                         /* Iterate through missing packets */
 405                                         for (i=0; i<numMissing; i++)
 406                                         {
 407                                                 ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_sequence_number , tvb, offCur + i, 1, bo_little_endian );
 408                                         }
 409                                         break;
 410
 411                                 default:
 412                                         break;
 413                         };
 414
 415                         if( fCon ) {
 416                                 /* There is a variable part if the Con flag is set */
 417                                 ti = proto_tree_add_bytes_format(
 418                                                 wtp_tree,                       /* tree */
 419                                                 hf_wtp_header_variable_part,    /* id */
 420                                                 tvb,
 421                                                 offCur + cbHeader,              /* start */
 422                                                 vHeader,                        /* length */
 423                                                 "What should go here!",         /* value */
 424                                                 "Header (Variable part) %02X %02X %02X %02X"  ,                 /* format */
 425                                                 0, 1, 2, 3
 426                                     );
 427                         } else {
 428                                 /* There is no variable part */
 429                         }; /* End of variable part of header */
 430                 }
 431         } else {
 432 #ifdef DEBUG
 433                 fprintf( stderr, "dissect_wtp: (4) tree was %p\n", tree );
 434 #endif
 435         }
 436
 437         /* Any remaining data ought to be WSP data,
 438          * so hand off to the WSP dissector */
 439         if (tvb_reported_length (tvb) > cbHeader + vHeader)
 440         {
 441                 wsp_tvb = tvb_new_subset(tvb, cbHeader + vHeader, -1,
 442                         tvb_reported_length (tvb)-cbHeader-vHeader);
 443                 call_dissector(wsp_handle, wsp_tvb, pinfo, tree);
 444         }
 445
 446 #ifdef DEBUG
 447         fprintf( stderr, "dissect_wtp: (leaving) fdata->cinfo is %p\n", fdata->cinfo );
 448 #endif
 449 }
 450
 451 /*
 452  * Called directly from UDP.
 453  * Put "WTP+WSP" into the "Protocol" column.
 454  */
 455 void
 456 dissect_wtp_fromudp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 457 {
 458         if (check_col(pinfo->fd, COL_PROTOCOL))
 459                 col_set_str(pinfo->fd, COL_PROTOCOL, "WTP+WSP" );
 460
 461         dissect_wtp_common(tvb, pinfo, tree);
 462 }
 463
 464 /*
 465  * Called from a higher-level WAP dissector, presumably WTLS.
 466  * Put "WTLS+WSP+WTP" to the "Protocol" column.
 467  *
 468  * XXX - is this supposed to be called from WTLS?  If so, we're not
 469  * calling it....
 470  *
 471  * XXX - can this be called from any other dissector?
 472  */
 473 static void
 474 dissect_wtp_fromwap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 475 {
 476         if (check_col(pinfo->fd, COL_PROTOCOL))
 477                 col_set_str(pinfo->fd, COL_PROTOCOL, "WTLS+WTP+WSP" );
 478
 479         dissect_wtp_common(tvb, pinfo, tree);
 480 }
 481
 482 static char pdu_type(unsigned char octet)
 483 {
 484         char ch = (octet >> 3) & 0x0F;
 485         /* Note pdu type must not be 0x00 */
 486         return ch;
 487 };
 488
 489 static char transaction_class(unsigned char octet)
 490 {
 491         char ch = (octet >> 0) & 0x03; /* ......XX */
 492         return ch;
 493 };
 494
 495 static char retransmission_indicator(unsigned char octet)
 496 {
 497         switch ( pdu_type(octet) ) {
 498                 case INVOKE:
 499                 case RESULT:
 500                 case ACK:
 501                 case SEGMENTED_INVOKE:
 502                 case SEGMENTED_RESULT:
 503                 case NEGATIVE_ACK:
 504                         return (octet >> 0) & 0x01; /* ......,X */
 505                 default:
 506                         return 0;
 507         }
 508 };
 509
 510 /* Register the protocol with Ethereal */
 511 void
 512 proto_register_wtp(void)
 513 {
 514
 515 /* Setup list of header fields */
 516         static hf_register_info hf[] = {
 517                 { &hf_wtp_header_fixed_part,
 518                         {       "Header",
 519                                 "wtp.header_fixed_part",
 520                                 FT_BYTES, BASE_HEX, NULL, 0x0,
 521                                 "Fixed part of the header", HFILL
 522                         }
 523                 },
 524                 { &hf_wtp_header_flag_continue,
 525                         {       "Continue Flag",
 526                                 "wtp.continue_flag",
 527                                 FT_BOOLEAN, 8, TFS( &continue_truth ), 0x80,
 528                                 "Continue Flag", HFILL
 529                         }
 530                 },
 531                 { &hf_wtp_header_pdu_type,
 532                         {       "PDU Type",
 533                                 "wtp.pdu_type",
 534                                  FT_UINT8, BASE_HEX, VALS( vals_pdu_type ), 0x78,
 535                                 "PDU Type", HFILL
 536                         }
 537                 },
 538                 { &hf_wtp_header_flag_Trailer,
 539                         {       "Trailer Flags",
 540                                 "wtp.trailer_flags",
 541                                  FT_UINT8, BASE_HEX, VALS( vals_transaction_trailer ), 0x06,
 542                                 "Trailer Flags", HFILL
 543                         }
 544                 },
 545                 { &hf_wtp_header_flag_RID,
 546                         {       "Re-transmission Indicator",
 547                                 "wtp.RID",
 548                                  FT_BOOLEAN, 8, TFS( &RID_truth ), 0x01,
 549                                 "Re-transmission Indicator", HFILL
 550                         }
 551                 },
 552                 { &hf_wtp_header_flag_TID_response,
 553                         {       "TID Response",
 554                                 "wtp.TID.response",
 555                                 FT_BOOLEAN, 16, TFS( &tid_response_truth ), 0x8000,
 556                                 "TID Response", HFILL
 557                         }
 558                 },
 559                 { &hf_wtp_header_flag_TID,
 560                         {       "Transaction ID",
 561                                 "wtp.TID",
 562                                  FT_UINT16, BASE_HEX, NULL, 0x7FFF,
 563                                 "Transaction ID", HFILL
 564                         }
 565                 },
 566                 { &hf_wtp_header_Inv_version,
 567                         {       "Version",
 568                                 "wtp.header.version",
 569                                  FT_UINT8, BASE_HEX, VALS( vals_version ), 0xC0,
 570                                 "Version", HFILL
 571                         }
 572                 },
 573                 { &hf_wtp_header_Inv_flag_TIDNew,
 574                         {       "TIDNew",
 575                                 "wtp.header.TIDNew",
 576                                  FT_BOOLEAN, 8, TFS( &TIDNew_truth ), 0x20,
 577                                 "TIDNew", HFILL
 578                         }
 579                 },
 580                 { &hf_wtp_header_Inv_flag_UP,
 581                         {       "U/P flag",
 582                                 "wtp.header.UP",
 583                                  FT_BOOLEAN, 8, TFS( &UP_truth ), 0x10,
 584                                 "U/P Flag", HFILL
 585                         }
 586                 },
 587                 { &hf_wtp_header_Inv_Reserved,
 588                         {       "Reserved",
 589                                 "wtp.inv.reserved",
 590                                  FT_UINT8, BASE_HEX, NULL, 0x0C,
 591                                 "Reserved", HFILL
 592                         }
 593                 },
 594                 { &hf_wtp_header_Inv_TransactionClass,
 595                         {       "Transaction Class",
 596                                 "wtp.inv.transaction_class",
 597                                  FT_UINT8, BASE_HEX, VALS( vals_transaction_classes ), 0x03,
 598                                 "Transaction Class", HFILL
 599                         }
 600                 },
 601                 { &hf_wtp_header_Ack_flag_TVETOK,
 602                         {       "Tve/Tok flag",
 603                                 "wtp.ack.tvetok",
 604                                  FT_BOOLEAN, 8, TFS( &TVETOK_truth ), 0x04,
 605                                 "Tve/Tok flag", HFILL
 606                         }
 607                 },
 608                 { &hf_wtp_header_Abort_type,
 609                         {       "Abort Type",
 610                                 "wtp.abort.type",
 611                                  FT_UINT8, BASE_HEX, VALS ( vals_abort_type ), 0x07,
 612                                 "Abort Type", HFILL
 613                         }
 614                 },
 615                 { &hf_wtp_header_Abort_reason_provider,
 616                         {       "Abort Reason",
 617                                 "wtp.abort.reason.provider",
 618                                  FT_UINT8, BASE_HEX, VALS ( vals_abort_reason_provider ), 0x00,
 619                                 "Abort Reason", HFILL
 620                         }
 621                 },
 622                 /* Assume WSP is the user and use its reason codes */
 623                 { &hf_wtp_header_Abort_reason_user,
 624                         {       "Abort Reason",
 625                                 "wtp.abort.reason.user",
 626                                  FT_UINT8, BASE_HEX, VALS ( vals_wsp_reason_codes ), 0x00,
 627                                 "Abort Reason", HFILL
 628                         }
 629                 },
 630                 { &hf_wtp_header_sequence_number,
 631                         {       "Packet Sequence Number",
 632                                 "wtp.header.sequence",
 633                                  FT_UINT8, BASE_HEX, NULL, 0x00,
 634                                 "Packet Sequence Number", HFILL
 635                         }
 636                 },
 637                 { &hf_wtp_header_missing_packets,
 638                         {       "Missing Packets",
 639                                 "wtp.header.missing_packets",
 640                                  FT_UINT8, BASE_HEX, NULL, 0x00,
 641                                 "Missing Packets", HFILL
 642                         }
 643                 },
 644                 { &hf_wtp_header_variable_part,
 645                         {       "Header: Variable part",
 646                                 "wtp.header_variable_part",
 647                                 FT_BYTES, BASE_HEX, NULL, 0x0,
 648                                 "Variable part of the header", HFILL
 649                         }
 650                 },
 651                 { &hf_wtp_data,
 652                         {       "Data",
 653                                 "wtp.header_data",
 654                                 FT_BYTES, BASE_HEX, NULL, 0x0,
 655                                 "Data", HFILL
 656                         }
 657                 },
 658         };
 659
 660 /* Setup protocol subtree array */
 661         static gint *ett[] = {
 662                 &ett_wtp,
 663                 &ett_header,
 664         };
 665
 666 /* Register the protocol name and description */
 667         proto_wtp = proto_register_protocol(
 668                 "Wireless Transaction Protocol",   /* protocol name for use by ethereal */
 669                 "WTP",                             /* short version of name */
 670                 "wap-wsp-wtp"                      /* Abbreviated protocol name, should Match IANA
 671                                                     < URL:http://www.isi.edu/in-notes/iana/assignments/port-numbers/ >
 672                                                   */
 673         );
 674
 675 /* Required function calls to register the header fields and subtrees used */
 676         proto_register_field_array(proto_wtp, hf, array_length(hf));
 677         proto_register_subtree_array(ett, array_length(ett));
 678
 679         register_dissector("wtp", dissect_wtp_fromwap, proto_wtp);
 680 };
 681
 682 void
 683 proto_reg_handoff_wtp(void)
 684 {
 685         /*
 686          * Get a handle for the connection-oriented WSP dissector - if WTP
 687          * PDUs have data, it is WSP.
 688          */
 689         wsp_handle = find_dissector("wsp-co");
 690
 691         dissector_add("udp.port", UDP_PORT_WTP_WSP, dissect_wtp_fromudp,
 692             proto_wtp);
 693 }