packet-wtp.c

   1 /* packet-wtp.c
   2  *
   3  * Routines to dissect WTP component of WAP traffic.
   4  *
   5  * $Id: packet-wtp.c,v 1.23 2001/12/10 00:25:41 guy Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@ethereal.com>
   9  * Copyright 1998 Gerald Combs
  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_sub_pdu_size                   = HF_EMPTY;
 152 static int hf_wtp_header_flag_continue                  = HF_EMPTY;
 153 static int hf_wtp_header_pdu_type                               = HF_EMPTY;
 154 static int hf_wtp_header_flag_Trailer                   = HF_EMPTY;
 155 static int hf_wtp_header_flag_RID                               = HF_EMPTY;
 156 static int hf_wtp_header_flag_TID                               = HF_EMPTY;
 157 static int hf_wtp_header_flag_TID_response              = HF_EMPTY;
 158
 159 /* These fields used by Invoke packets */
 160 static int hf_wtp_header_Inv_version                    = HF_EMPTY;
 161 static int hf_wtp_header_Inv_flag_TIDNew                = HF_EMPTY;
 162 static int hf_wtp_header_Inv_flag_UP                    = HF_EMPTY;
 163 static int hf_wtp_header_Inv_Reserved                   = HF_EMPTY;
 164 static int hf_wtp_header_Inv_TransactionClass   = HF_EMPTY;
 165
 166
 167 static int hf_wtp_header_variable_part                  = HF_EMPTY;
 168 static int hf_wtp_data                                                  = HF_EMPTY;
 169
 170 static int hf_wtp_header_Ack_flag_TVETOK                = HF_EMPTY;
 171 static int hf_wtp_header_Abort_type                             = HF_EMPTY;
 172 static int hf_wtp_header_Abort_reason_provider  = HF_EMPTY;
 173 static int hf_wtp_header_Abort_reason_user              = HF_EMPTY;
 174 static int hf_wtp_header_sequence_number                = HF_EMPTY;
 175 static int hf_wtp_header_missing_packets                = HF_EMPTY;
 176
 177 /* Initialize the subtree pointers */
 178 static gint ett_wtp                                                     = ETT_EMPTY;
 179 static gint ett_header                                                  = ETT_EMPTY;
 180
 181 /* Handle for WSP dissector */
 182 static dissector_handle_t wsp_handle;
 183
 184 /* Declarations */
 185 static char transaction_class(unsigned char octet);
 186 static char pdu_type(unsigned char octet);
 187 static char retransmission_indicator(unsigned char octet);
 188
 189 /* Code to actually dissect the packets */
 190 static void
 191 dissect_wtp_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 192 {
 193         char szInfo[ 50 ];
 194         int offCur                      = 0; /* current offset from start of WTP data */
 195
 196         /* bytes at offset 0 - 3 */
 197         /*
 198         unsigned char  b0 = pd[offset + 0];
 199         unsigned char  b3 = pd[offset + 3];
 200         */
 201         unsigned char  b0;
 202
 203         /* continuation flag */
 204         unsigned char   fCon;
 205         unsigned char   fRID;
 206         guint           cbHeader        = 0;
 207         guint           vHeader         = 0;
 208         int             abortType       = 0;
 209
 210 /* Set up structures we will need to add the protocol subtree and manage it */
 211         proto_item *ti;
 212         proto_tree *wtp_tree = NULL;
 213         proto_tree *wtp_header_fixed;
 214
 215         char pdut;
 216         char clsTransaction             = ' ';
 217         int cchInfo;
 218         int numMissing = 0;             /* Number of missing packets in a negative ack */
 219         int i;
 220         tvbuff_t *wsp_tvb = NULL;
 221
 222         b0 = tvb_get_guint8 (tvb, offCur + 0);
 223         /* Discover Concatenated PDUs */
 224         if (b0 == 0) {
 225                 if (tree) {
 226                         wtp_tree = proto_tree_add_item(tree, proto_wtp, tvb, offCur, 1, bo_little_endian);
 227                 }
 228                 offCur = 1;
 229                 i = 1;
 230                 while (offCur < (int) tvb_reported_length (tvb)) {
 231                         b0 = tvb_get_guint8 (tvb, offCur + 0);
 232                         if (b0 & 0x80) {
 233                                 vHeader = 2;
 234                                 cbHeader = ((b0 & 0x7f) << 8) |
 235                                                         tvb_get_guint8 (tvb, offCur + 1);
 236                         } else {
 237                                 vHeader = 1;
 238                                 cbHeader = b0;
 239                         }
 240                     if (tree) {
 241                                 proto_tree_add_item(wtp_tree, hf_wtp_header_sub_pdu_size, tvb, offCur, vHeader, bo_big_endian);
 242                         }
 243                         if (i > 1 && check_col(pinfo->cinfo, COL_INFO)) {
 244                                 col_append_str (pinfo->cinfo, COL_INFO, ", ");
 245                         }
 246                         wsp_tvb = tvb_new_subset(tvb,
 247                                 offCur + vHeader, -1, cbHeader);
 248                         dissect_wtp_common (wsp_tvb, pinfo, wtp_tree);
 249                         offCur += vHeader + cbHeader;
 250                         i++;
 251                 }
 252                 return;
 253         }
 254         fCon = b0 & 0x80;
 255         fRID = retransmission_indicator( b0 );
 256         pdut = pdu_type( b0 );
 257
 258         /* Develop the string to put in the Info column */
 259         cchInfo = snprintf( szInfo, sizeof( szInfo ), "WTP %s",
 260             val_to_str(pdut, vals_pdu_type, "Unknown PDU type 0x%x"));
 261
 262         switch( pdut ) {
 263                 case INVOKE:
 264                         clsTransaction = transaction_class( tvb_get_guint8 (tvb, offCur + 3) );
 265                         snprintf( szInfo + cchInfo, sizeof( szInfo ) - cchInfo, " Class %d", clsTransaction  );
 266
 267                 case ABORT:
 268                 case SEGMENTED_INVOKE:
 269                 case SEGMENTED_RESULT:
 270                         cbHeader = 4;
 271                         break;
 272
 273                 case RESULT:
 274                 case ACK:
 275                         cbHeader = 3;
 276                         break;
 277
 278                 case NEGATIVE_ACK:
 279                         /* Varible number of missing packets */
 280                         numMissing = tvb_get_guint8 (tvb, offCur + 3);
 281                         cbHeader = numMissing + 4;
 282                         break;
 283
 284                 default:
 285                         break;
 286         };
 287
 288         if( fRID ) {
 289                 strcat( szInfo, " R" );
 290         };
 291         if( fCon ) {
 292                 unsigned char   tCon;
 293                 unsigned char   tByte;
 294
 295                 do {
 296                         tByte = tvb_get_guint8(tvb, offCur + cbHeader + vHeader);
 297                         tCon = tByte & 0x80;
 298                         if (tByte & 0x04)
 299                                 vHeader = vHeader + tvb_get_guint8(tvb,
 300                                         offCur + cbHeader + vHeader + 1) + 2;
 301                         else
 302                                 vHeader = vHeader + (tByte & 0x03) + 1;
 303                 } while (tCon);
 304         }
 305
 306 #ifdef DEBUG
 307         fprintf( stderr, "dissect_wtp: cbHeader = %d\n", cbHeader );
 308 #endif
 309
 310 /* This field shows up as the "Info" column in the display; you should make
 311    it, if possible, summarize what's in the packet, so that a user looking
 312    at the list of packets can tell what type of packet it is. */
 313         if (check_col(pinfo->cinfo, COL_INFO) &&
 314                 tvb_reported_length (tvb) <= cbHeader + vHeader) {
 315 #ifdef DEBUG
 316                 fprintf( stderr, "dissect_wtp: (6) About to set info_col header to %s\n", szInfo );
 317 #endif
 318                 col_append_str(pinfo->cinfo, COL_INFO, szInfo );
 319         };
 320 /* In the interest of speed, if "tree" is NULL, don't do any work not
 321    necessary to generate protocol tree items. */
 322         if (tree) {
 323 #ifdef DEBUG
 324                 fprintf( stderr, "dissect_wtp: cbHeader = %d\n", cbHeader );
 325 #endif
 326                 ti = proto_tree_add_item(tree, proto_wtp, tvb, offCur, cbHeader + vHeader, bo_little_endian);
 327 #ifdef DEBUG
 328                 fprintf( stderr, "dissect_wtp: (7) Returned from proto_tree_add_item\n" );
 329 #endif
 330                 wtp_tree = proto_item_add_subtree(ti, ett_wtp);
 331
 332 /* Code to process the packet goes here */
 333                 {
 334 #ifdef DEBUG
 335                         fprintf( stderr, "dissect_wtp: cbHeader = %d\n", cbHeader );
 336                         fprintf( stderr, "dissect_wtp: offCur = %d\n", offCur );
 337                         fprintf( stderr, "dissect_wtp: About to call proto_tree_add_item with %p %d %p %d %d %d\n",
 338                                         wtp_tree, hf_wtp_header_fixed_part, tvb, offCur, cbHeader, bo_little_endian );
 339                         ti = proto_tree_add_item( wtp_tree, hf_wtp_header_fixed_part, tvb, offCur, cbHeader, bo_little_endian );
 340                         fprintf( stderr, "dissect_wtp: (6) Returned from proto_tree_add_item\n" );
 341 #endif
 342                         wtp_header_fixed = proto_item_add_subtree(
 343                                         ti,
 344                                         ett_header
 345                                 );
 346
 347                         /* Add common items: only CON and PDU Type */
 348                         ti = proto_tree_add_item(
 349                                         wtp_header_fixed,               /* tree */
 350                                         hf_wtp_header_flag_continue,    /* id */
 351                                         tvb,
 352                                         offCur,                         /* start of high light */
 353                                         1,                              /* length of high light */
 354                                         b0                              /* value */
 355                              );
 356                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_pdu_type, tvb, offCur, 1, bo_little_endian );
 357
 358                         switch( pdut ) {
 359                                 case INVOKE:
 360                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian );
 361                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 362                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 363                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 364
 365                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Inv_version , tvb, offCur + 3, 1, bo_little_endian );
 366                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Inv_flag_TIDNew, tvb, offCur + 3, 1, bo_little_endian );
 367                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Inv_flag_UP, tvb, offCur + 3, 1, bo_little_endian );
 368                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Inv_Reserved, tvb, offCur + 3, 1, bo_little_endian );
 369                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Inv_TransactionClass, tvb, offCur + 3, 1, bo_little_endian );
 370                                         break;
 371
 372                                 case RESULT:
 373                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian );
 374                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 375                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 376                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 377                                         break;
 378
 379                                 case ACK:
 380                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Ack_flag_TVETOK, tvb, offCur, 1, bo_big_endian );
 381
 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                                         break;
 386
 387                                 case ABORT:
 388                                         abortType = tvb_get_guint8 (tvb, offCur) & 0x07;
 389                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Abort_type , tvb, offCur , 1, bo_little_endian );
 390                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 391                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 392
 393                                         if (abortType == PROVIDER)
 394                                         {
 395                                                 ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Abort_reason_provider , tvb, offCur + 3 , 1, bo_little_endian );
 396                                         }
 397                                         else if (abortType == USER)
 398                                         {
 399                                                 ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_Abort_reason_user , tvb, offCur + 3 , 1, bo_little_endian );
 400                                         }
 401                                         break;
 402
 403                                 case SEGMENTED_INVOKE:
 404                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian );
 405                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 406                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 407                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 408
 409                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_sequence_number , tvb, offCur + 3, 1, bo_little_endian );
 410                                         break;
 411
 412                                 case SEGMENTED_RESULT:
 413                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian );
 414                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 415                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 416                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 417
 418                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_sequence_number , tvb, offCur + 3, 1, bo_little_endian );
 419                                         break;
 420
 421                                 case NEGATIVE_ACK:
 422                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian );
 423                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian );
 424                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian );
 425
 426                                         ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_missing_packets , tvb, offCur + 3, 1, bo_little_endian );
 427                                         /* Iterate through missing packets */
 428                                         for (i=0; i<numMissing; i++)
 429                                         {
 430                                                 ti = proto_tree_add_item( wtp_header_fixed, hf_wtp_header_sequence_number , tvb, offCur + i, 1, bo_little_endian );
 431                                         }
 432                                         break;
 433
 434                                 default:
 435                                         break;
 436                         };
 437
 438                         if( fCon ) {
 439                                 /* There is a variable part if the Con flag is set */
 440                                 ti = proto_tree_add_bytes_format(
 441                                                 wtp_tree,                       /* tree */
 442                                                 hf_wtp_header_variable_part,    /* id */
 443                                                 tvb,
 444                                                 offCur + cbHeader,              /* start */
 445                                                 vHeader,                        /* length */
 446                                                 "What should go here!",         /* value */
 447                                                 "Header (Variable part) %02X %02X %02X %02X"  ,                 /* format */
 448                                                 0, 1, 2, 3
 449                                     );
 450                         } else {
 451                                 /* There is no variable part */
 452                         }; /* End of variable part of header */
 453                 }
 454         } else {
 455 #ifdef DEBUG
 456                 fprintf( stderr, "dissect_wtp: (4) tree was %p\n", tree );
 457 #endif
 458         }
 459
 460         /* Any remaining data ought to be WSP data,
 461          * so hand off to the WSP dissector */
 462         if (tvb_reported_length (tvb) > cbHeader + vHeader)
 463         {
 464                 wsp_tvb = tvb_new_subset(tvb, cbHeader + vHeader, -1,
 465                         tvb_reported_length (tvb)-cbHeader-vHeader);
 466                 call_dissector(wsp_handle, wsp_tvb, pinfo, tree);
 467         }
 468 }
 469
 470 /*
 471  * Called directly from UDP.
 472  * Put "WTP+WSP" into the "Protocol" column.
 473  */
 474 static void
 475 dissect_wtp_fromudp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 476 {
 477         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 478                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "WTP+WSP" );
 479         if (check_col(pinfo->cinfo, COL_INFO)) {
 480                 col_clear(pinfo->cinfo, COL_INFO);
 481         }
 482
 483         dissect_wtp_common(tvb, pinfo, tree);
 484 }
 485
 486 /*
 487  * Called from a higher-level WAP dissector, presumably WTLS.
 488  * Put "WTLS+WSP+WTP" to the "Protocol" column.
 489  *
 490  * XXX - is this supposed to be called from WTLS?  If so, we're not
 491  * calling it....
 492  *
 493  * XXX - can this be called from any other dissector?
 494  */
 495 static void
 496 dissect_wtp_fromwap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 497 {
 498         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 499                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "WTLS+WTP+WSP" );
 500         if (check_col(pinfo->cinfo, COL_INFO)) {
 501                 col_clear(pinfo->cinfo, COL_INFO);
 502         }
 503
 504         dissect_wtp_common(tvb, pinfo, tree);
 505 }
 506
 507 static char pdu_type(unsigned char octet)
 508 {
 509         char ch = (octet >> 3) & 0x0F;
 510         /* Note pdu type must not be 0x00 */
 511         return ch;
 512 };
 513
 514 static char transaction_class(unsigned char octet)
 515 {
 516         char ch = (octet >> 0) & 0x03; /* ......XX */
 517         return ch;
 518 };
 519
 520 static char retransmission_indicator(unsigned char octet)
 521 {
 522         switch ( pdu_type(octet) ) {
 523                 case INVOKE:
 524                 case RESULT:
 525                 case ACK:
 526                 case SEGMENTED_INVOKE:
 527                 case SEGMENTED_RESULT:
 528                 case NEGATIVE_ACK:
 529                         return (octet >> 0) & 0x01; /* ......,X */
 530                 default:
 531                         return 0;
 532         }
 533 };
 534
 535 /* Register the protocol with Ethereal */
 536 void
 537 proto_register_wtp(void)
 538 {
 539
 540 /* Setup list of header fields */
 541         static hf_register_info hf[] = {
 542                 { &hf_wtp_header_fixed_part,
 543                         {       "Header",
 544                                 "wtp.header_fixed_part",
 545                                 FT_BYTES, BASE_HEX, NULL, 0x0,
 546                                 "Fixed part of the header", HFILL
 547                         }
 548                 },
 549                 { &hf_wtp_header_sub_pdu_size,
 550                         {       "Sub PDU size",
 551                                 "wtp.sub_pdu_size",
 552                                 FT_BYTES, BASE_HEX, NULL, 0x0,
 553                                 "Size of Sub-PDU", HFILL
 554                         }
 555                 },
 556                 { &hf_wtp_header_flag_continue,
 557                         {       "Continue Flag",
 558                                 "wtp.continue_flag",
 559                                 FT_BOOLEAN, 8, TFS( &continue_truth ), 0x80,
 560                                 "Continue Flag", HFILL
 561                         }
 562                 },
 563                 { &hf_wtp_header_pdu_type,
 564                         {       "PDU Type",
 565                                 "wtp.pdu_type",
 566                                  FT_UINT8, BASE_HEX, VALS( vals_pdu_type ), 0x78,
 567                                 "PDU Type", HFILL
 568                         }
 569                 },
 570                 { &hf_wtp_header_flag_Trailer,
 571                         {       "Trailer Flags",
 572                                 "wtp.trailer_flags",
 573                                  FT_UINT8, BASE_HEX, VALS( vals_transaction_trailer ), 0x06,
 574                                 "Trailer Flags", HFILL
 575                         }
 576                 },
 577                 { &hf_wtp_header_flag_RID,
 578                         {       "Re-transmission Indicator",
 579                                 "wtp.RID",
 580                                  FT_BOOLEAN, 8, TFS( &RID_truth ), 0x01,
 581                                 "Re-transmission Indicator", HFILL
 582                         }
 583                 },
 584                 { &hf_wtp_header_flag_TID_response,
 585                         {       "TID Response",
 586                                 "wtp.TID.response",
 587                                 FT_BOOLEAN, 16, TFS( &tid_response_truth ), 0x8000,
 588                                 "TID Response", HFILL
 589                         }
 590                 },
 591                 { &hf_wtp_header_flag_TID,
 592                         {       "Transaction ID",
 593                                 "wtp.TID",
 594                                  FT_UINT16, BASE_HEX, NULL, 0x7FFF,
 595                                 "Transaction ID", HFILL
 596                         }
 597                 },
 598                 { &hf_wtp_header_Inv_version,
 599                         {       "Version",
 600                                 "wtp.header.version",
 601                                  FT_UINT8, BASE_HEX, VALS( vals_version ), 0xC0,
 602                                 "Version", HFILL
 603                         }
 604                 },
 605                 { &hf_wtp_header_Inv_flag_TIDNew,
 606                         {       "TIDNew",
 607                                 "wtp.header.TIDNew",
 608                                  FT_BOOLEAN, 8, TFS( &TIDNew_truth ), 0x20,
 609                                 "TIDNew", HFILL
 610                         }
 611                 },
 612                 { &hf_wtp_header_Inv_flag_UP,
 613                         {       "U/P flag",
 614                                 "wtp.header.UP",
 615                                  FT_BOOLEAN, 8, TFS( &UP_truth ), 0x10,
 616                                 "U/P Flag", HFILL
 617                         }
 618                 },
 619                 { &hf_wtp_header_Inv_Reserved,
 620                         {       "Reserved",
 621                                 "wtp.inv.reserved",
 622                                  FT_UINT8, BASE_HEX, NULL, 0x0C,
 623                                 "Reserved", HFILL
 624                         }
 625                 },
 626                 { &hf_wtp_header_Inv_TransactionClass,
 627                         {       "Transaction Class",
 628                                 "wtp.inv.transaction_class",
 629                                  FT_UINT8, BASE_HEX, VALS( vals_transaction_classes ), 0x03,
 630                                 "Transaction Class", HFILL
 631                         }
 632                 },
 633                 { &hf_wtp_header_Ack_flag_TVETOK,
 634                         {       "Tve/Tok flag",
 635                                 "wtp.ack.tvetok",
 636                                  FT_BOOLEAN, 8, TFS( &TVETOK_truth ), 0x04,
 637                                 "Tve/Tok flag", HFILL
 638                         }
 639                 },
 640                 { &hf_wtp_header_Abort_type,
 641                         {       "Abort Type",
 642                                 "wtp.abort.type",
 643                                  FT_UINT8, BASE_HEX, VALS ( vals_abort_type ), 0x07,
 644                                 "Abort Type", HFILL
 645                         }
 646                 },
 647                 { &hf_wtp_header_Abort_reason_provider,
 648                         {       "Abort Reason",
 649                                 "wtp.abort.reason.provider",
 650                                  FT_UINT8, BASE_HEX, VALS ( vals_abort_reason_provider ), 0x00,
 651                                 "Abort Reason", HFILL
 652                         }
 653                 },
 654                 /* Assume WSP is the user and use its reason codes */
 655                 { &hf_wtp_header_Abort_reason_user,
 656                         {       "Abort Reason",
 657                                 "wtp.abort.reason.user",
 658                                  FT_UINT8, BASE_HEX, VALS ( vals_wsp_reason_codes ), 0x00,
 659                                 "Abort Reason", HFILL
 660                         }
 661                 },
 662                 { &hf_wtp_header_sequence_number,
 663                         {       "Packet Sequence Number",
 664                                 "wtp.header.sequence",
 665                                  FT_UINT8, BASE_HEX, NULL, 0x00,
 666                                 "Packet Sequence Number", HFILL
 667                         }
 668                 },
 669                 { &hf_wtp_header_missing_packets,
 670                         {       "Missing Packets",
 671                                 "wtp.header.missing_packets",
 672                                  FT_UINT8, BASE_HEX, NULL, 0x00,
 673                                 "Missing Packets", HFILL
 674                         }
 675                 },
 676                 { &hf_wtp_header_variable_part,
 677                         {       "Header: Variable part",
 678                                 "wtp.header_variable_part",
 679                                 FT_BYTES, BASE_HEX, NULL, 0x0,
 680                                 "Variable part of the header", HFILL
 681                         }
 682                 },
 683                 { &hf_wtp_data,
 684                         {       "Data",
 685                                 "wtp.header_data",
 686                                 FT_BYTES, BASE_HEX, NULL, 0x0,
 687                                 "Data", HFILL
 688                         }
 689                 },
 690         };
 691
 692 /* Setup protocol subtree array */
 693         static gint *ett[] = {
 694                 &ett_wtp,
 695                 &ett_header,
 696         };
 697
 698 /* Register the protocol name and description */
 699         proto_wtp = proto_register_protocol(
 700                 "Wireless Transaction Protocol",   /* protocol name for use by ethereal */
 701                 "WTP",                             /* short version of name */
 702                 "wap-wsp-wtp"                      /* Abbreviated protocol name, should Match IANA
 703                                                     < URL:http://www.isi.edu/in-notes/iana/assignments/port-numbers/ >
 704                                                   */
 705         );
 706
 707 /* Required function calls to register the header fields and subtrees used */
 708         proto_register_field_array(proto_wtp, hf, array_length(hf));
 709         proto_register_subtree_array(ett, array_length(ett));
 710
 711         register_dissector("wtp", dissect_wtp_fromwap, proto_wtp);
 712         register_dissector("wtp-udp", dissect_wtp_fromudp, proto_wtp);
 713 };
 714
 715 void
 716 proto_reg_handoff_wtp(void)
 717 {
 718         dissector_handle_t wtp_fromudp_handle;
 719
 720         /*
 721          * Get a handle for the connection-oriented WSP dissector - if WTP
 722          * PDUs have data, it is WSP.
 723          */
 724         wsp_handle = find_dissector("wsp-co");
 725
 726         wtp_fromudp_handle = find_dissector("wtp-udp");
 727         dissector_add("udp.port", UDP_PORT_WTP_WSP, wtp_fromudp_handle);
 728 }