packet-wtp.c

   1 /* packet-wtp.c
   2  *
   3  * Routines to dissect WTP component of WAP traffic.
   4  *
   5  * $Id: packet-wtp.c,v 1.42 2002/12/19 11:22:38 sahlberg 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 NEED_SNPRINTF_H
  38 # include "snprintf.h"
  39 #endif
  40
  41 #include <string.h>
  42 #include <glib.h>
  43 #include <epan/packet.h>
  44 #include "reassemble.h"
  45 #include "packet-wap.h"
  46 #include "packet-wtp.h"
  47 #include "packet-wsp.h"
  48
  49 static const true_false_string continue_truth = {
  50     "TPI Present" ,
  51     "No TPI"
  52 };
  53
  54 static const true_false_string RID_truth = {
  55     "Re-Transmission",
  56     "First transmission"
  57 };
  58
  59 static const true_false_string TIDNew_truth = {
  60     "TID is new" ,
  61     "TID is valid"
  62 };
  63
  64 static const true_false_string tid_response_truth = {
  65     "Response" ,
  66     "Original"
  67 };
  68
  69 static const true_false_string UP_truth = {
  70     "User Acknowledgement required" ,
  71     "User Acknowledgement optional"
  72 };
  73
  74 static const true_false_string TVETOK_truth = {
  75     "True",
  76     "False"
  77 };
  78
  79 static const value_string vals_pdu_type[] = {
  80     { 0, "Not Allowed" },
  81     { 1, "Invoke" },
  82     { 2, "Result" },
  83     { 3, "Ack" },
  84     { 4, "Abort" },
  85     { 5, "Segmented Invoke" },
  86     { 6, "Segmented Result" },
  87     { 7, "Negative Ack" },
  88     { 0, NULL }
  89 };
  90
  91 static const value_string vals_transaction_trailer[] = {
  92     { 0, "Not last packet" },
  93     { 1, "Last packet of message" },
  94     { 2, "Last packet of group" },
  95     { 3, "Re-assembly not supported" },
  96     { 0, NULL }
  97 };
  98
  99 static const value_string vals_version[] = {
 100     { 0, "Current" },
 101     { 1, "Undefined" },
 102     { 2, "Undefined" },
 103     { 3, "Undefined" },
 104     { 0, NULL }
 105 };
 106
 107 static const value_string vals_abort_type[] = {
 108     { 0, "Provider" },
 109     { 1, "User (WSP)" },
 110     { 0, NULL }
 111 };
 112
 113 static const value_string vals_abort_reason_provider[] = {
 114     { 0x00, "Unknown" },
 115     { 0x01, "Protocol Error" },
 116     { 0x02, "Invalid TID" },
 117     { 0x03, "Not Implemented Class 2" },
 118     { 0x04, "Not Implemented SAR" },
 119     { 0x05, "Not Implemented User Acknowledgement" },
 120     { 0x06, "WTP Version Zero" },
 121     { 0x07, "Capacity Temporarily Exceeded" },
 122     { 0x08, "No Response" },
 123     { 0x09, "Message Too Large" },
 124     { 0x00, NULL }
 125 };
 126
 127 static const value_string vals_transaction_classes[] = {
 128     { 0x00, "Unreliable Invoke without Result" },
 129     { 0x01, "Reliable Invoke without Result" },
 130     { 0x02, "Reliable Invoke with Reliable Result" },
 131     { 0x00, NULL }
 132 };
 133
 134 static const value_string vals_tpi_type[] = {
 135     { 0x00, "Error" },
 136     { 0x01, "Info" },
 137     { 0x02, "Option" },
 138     { 0x03, "Packet sequence number" },
 139     { 0x04, "SDU boundary" },
 140     { 0x05, "Frame boundary" },
 141     { 0x00, NULL }
 142 };
 143
 144 static const value_string vals_tpi_opt[] = {
 145     { 0x01, "Maximum receive unit" },
 146     { 0x02, "Total message size" },
 147     { 0x03, "Delay transmission timer" },
 148     { 0x04, "Maximum group" },
 149     { 0x05, "Current TID" },
 150     { 0x06, "No cached TID" },
 151     { 0x00, NULL }
 152 };
 153
 154 /* File scoped variables for the protocol and registered fields */
 155 static int proto_wtp                            = HF_EMPTY;
 156
 157 /* These fields used by fixed part of header */
 158 static int hf_wtp_header_sub_pdu_size           = HF_EMPTY;
 159 static int hf_wtp_header_flag_continue          = HF_EMPTY;
 160 static int hf_wtp_header_pdu_type               = HF_EMPTY;
 161 static int hf_wtp_header_flag_Trailer           = HF_EMPTY;
 162 static int hf_wtp_header_flag_RID               = HF_EMPTY;
 163 static int hf_wtp_header_flag_TID               = HF_EMPTY;
 164 static int hf_wtp_header_flag_TID_response      = HF_EMPTY;
 165
 166 /* These fields used by Invoke packets */
 167 static int hf_wtp_header_Inv_version            = HF_EMPTY;
 168 static int hf_wtp_header_Inv_flag_TIDNew        = HF_EMPTY;
 169 static int hf_wtp_header_Inv_flag_UP            = HF_EMPTY;
 170 static int hf_wtp_header_Inv_Reserved           = HF_EMPTY;
 171 static int hf_wtp_header_Inv_TransactionClass   = HF_EMPTY;
 172
 173
 174 static int hf_wtp_header_variable_part          = HF_EMPTY;
 175 static int hf_wtp_data                          = HF_EMPTY;
 176
 177 static int hf_wtp_tpi_type                      = HF_EMPTY;
 178 static int hf_wtp_tpi_psn                       = HF_EMPTY;
 179 static int hf_wtp_tpi_opt                       = HF_EMPTY;
 180 static int hf_wtp_tpi_optval                    = HF_EMPTY;
 181 static int hf_wtp_tpi_info                      = HF_EMPTY;
 182
 183 static int hf_wtp_header_Ack_flag_TVETOK        = HF_EMPTY;
 184 static int hf_wtp_header_Abort_type             = HF_EMPTY;
 185 static int hf_wtp_header_Abort_reason_provider  = HF_EMPTY;
 186 static int hf_wtp_header_Abort_reason_user      = HF_EMPTY;
 187 static int hf_wtp_header_sequence_number        = HF_EMPTY;
 188 static int hf_wtp_header_missing_packets        = HF_EMPTY;
 189
 190 /* These fields used when reassembling WTP fragments */
 191 static int hf_wtp_fragments                     = HF_EMPTY;
 192 static int hf_wtp_fragment                      = HF_EMPTY;
 193 static int hf_wtp_fragment_overlap              = HF_EMPTY;
 194 static int hf_wtp_fragment_overlap_conflict     = HF_EMPTY;
 195 static int hf_wtp_fragment_multiple_tails       = HF_EMPTY;
 196 static int hf_wtp_fragment_too_long_fragment    = HF_EMPTY;
 197 static int hf_wtp_fragment_error                = HF_EMPTY;
 198
 199 /* Initialize the subtree pointers */
 200 static gint ett_wtp                             = ETT_EMPTY;
 201 static gint ett_header                          = ETT_EMPTY;
 202 static gint ett_tpilist                         = ETT_EMPTY;
 203 static gint ett_wsp_fragments                   = ETT_EMPTY;
 204 static gint ett_wtp_fragment                    = ETT_EMPTY;
 205
 206 static const fragment_items wtp_frag_items = {
 207     &ett_wtp_fragment,
 208     &ett_wsp_fragments,
 209     &hf_wtp_fragments,
 210     &hf_wtp_fragment,
 211     &hf_wtp_fragment_overlap,
 212     &hf_wtp_fragment_overlap_conflict,
 213     &hf_wtp_fragment_multiple_tails,
 214     &hf_wtp_fragment_too_long_fragment,
 215     &hf_wtp_fragment_error,
 216     "fragments"
 217 };
 218
 219 /* Handle for WSP dissector */
 220 static dissector_handle_t wsp_handle;
 221
 222 /*
 223  * reassembly of WSP
 224  */
 225 static GHashTable       *wtp_fragment_table = NULL;
 226
 227 static void
 228 wtp_defragment_init(void)
 229 {
 230     fragment_table_init(&wtp_fragment_table);
 231 }
 232
 233 /*
 234  * Extract some bitfields
 235  */
 236 #define pdu_type(octet)                 (((octet) >> 3) & 0x0F) /* Note pdu type must not be 0x00 */
 237 #define transaction_class(octet)        ((octet) & 0x03)        /* ......XX */
 238 #define transmission_trailer(octet)     (((octet) >> 1) & 0x01) /* ......X. */
 239
 240 static char retransmission_indicator(unsigned char octet)
 241 {
 242     switch (pdu_type(octet)) {
 243         case INVOKE:
 244         case RESULT:
 245         case ACK:
 246         case SEGMENTED_INVOKE:
 247         case SEGMENTED_RESULT:
 248         case NEGATIVE_ACK:
 249             return octet & 0x01;        /* .......X */
 250         default:
 251             return 0;
 252     }
 253 }
 254
 255 /*
 256  * dissect a TPI
 257  */
 258 static void
 259 wtp_handle_tpi(proto_tree *tree, tvbuff_t *tvb)
 260 {
 261     int                  offset = 0;
 262     unsigned char        tByte;
 263     unsigned char        tType;
 264     unsigned char        tLen;
 265     proto_item          *subTree = NULL;
 266
 267     tByte = tvb_get_guint8(tvb, offset++);
 268     tType = (tByte & 0x78) >> 3;
 269     if (tByte & 0x04)                           /* Long TPI     */
 270         tLen = tvb_get_guint8(tvb, offset++);
 271     else
 272         tLen = tByte & 0x03;
 273     subTree = proto_tree_add_uint(tree, hf_wtp_tpi_type,
 274                                   tvb, 0, tvb_length(tvb), tType);
 275     proto_item_add_subtree(subTree, ett_tpilist);
 276     switch (tType) {
 277         case 0x00:                      /* Error*/
 278             /* \todo    */
 279             break;
 280         case 0x01:                      /* Info */
 281             /* Beware, untested case here       */
 282             proto_tree_add_item(subTree, hf_wtp_tpi_info,
 283                                 tvb, offset, tLen, bo_little_endian);
 284             break;
 285         case 0x02:                      /* Option       */
 286             proto_tree_add_item(subTree, hf_wtp_tpi_opt,
 287                                 tvb, offset++, 1, bo_little_endian);
 288             proto_tree_add_item(subTree, hf_wtp_tpi_optval,
 289                                 tvb, offset, tLen - 1, bo_little_endian);
 290             break;
 291         case 0x03:                      /* PSN  */
 292             proto_tree_add_item(subTree, hf_wtp_tpi_psn,
 293                                 tvb, offset, 1, bo_little_endian);
 294             break;
 295         case 0x04:                      /* SDU boundary */
 296             /* \todo    */
 297             break;
 298         case 0x05:                      /* Frame boundary       */
 299             /* \todo    */
 300             break;
 301         default:
 302             break;
 303     }
 304 }
 305
 306 /* Code to actually dissect the packets */
 307 static void
 308 dissect_wtp_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 309 {
 310     char        szInfo[50];
 311     int         offCur          = 0; /* current offset from start of WTP data */
 312
 313     unsigned char  b0;
 314
 315     /* continuation flag */
 316     unsigned char       fCon;                   /* Continue flag        */
 317     unsigned char       fRID;                   /* Re-transmission indicator*/
 318     unsigned char       fTTR = '\0';            /* Transmission trailer */
 319     guint               cbHeader        = 0;    /* Fixed header length  */
 320     guint               vHeader         = 0;    /* Variable header length*/
 321     int                 abortType       = 0;
 322
 323     /* Set up structures we'll need to add the protocol subtree and manage it */
 324     proto_item          *ti;
 325     proto_tree          *wtp_tree = NULL;
 326
 327     char                pdut;
 328     char                clsTransaction  = ' ';
 329     int                 cchInfo;
 330     int                 numMissing = 0;         /* Number of missing packets in a negative ack */
 331     int                 i;
 332     tvbuff_t            *wsp_tvb = NULL;
 333     fragment_data       *fd_head = NULL;
 334     guint8              psn = 0;                /* Packet sequence number*/
 335     guint16             TID = 0;                /* Transaction-Id       */
 336
 337     b0 = tvb_get_guint8 (tvb, offCur + 0);
 338     /* Discover Concatenated PDUs */
 339     if (b0 == 0) {
 340         guint   c_fieldlen = 0;         /* Length of length-field       */
 341         guint   c_pdulen = 0;           /* Length of conc. PDU  */
 342
 343         if (tree) {
 344             ti = proto_tree_add_item(tree, proto_wtp,
 345                                     tvb, offCur, 1, bo_little_endian);
 346             wtp_tree = proto_item_add_subtree(ti, ett_wtp);
 347         }
 348         offCur = 1;
 349         i = 1;
 350         while (offCur < (int) tvb_reported_length(tvb)) {
 351             b0 = tvb_get_guint8(tvb, offCur + 0);
 352             if (b0 & 0x80) {
 353                 c_fieldlen = 2;
 354                 c_pdulen = ((b0 & 0x7f) << 8) | tvb_get_guint8(tvb, offCur + 1);
 355             } else {
 356                 c_fieldlen = 1;
 357                 c_pdulen = b0;
 358             }
 359             if (tree) {
 360                 proto_tree_add_item(wtp_tree, hf_wtp_header_sub_pdu_size,
 361                                     tvb, offCur, c_fieldlen, bo_big_endian);
 362             }
 363             if (i > 1 && check_col(pinfo->cinfo, COL_INFO)) {
 364                 col_append_str(pinfo->cinfo, COL_INFO, ", ");
 365             }
 366             wsp_tvb = tvb_new_subset(tvb, offCur + c_fieldlen, -1, c_pdulen);
 367             dissect_wtp_common(wsp_tvb, pinfo, wtp_tree);
 368             offCur += c_fieldlen + c_pdulen;
 369             i++;
 370         }
 371         return;
 372     }
 373     fCon = b0 & 0x80;
 374     fRID = retransmission_indicator(b0);
 375     pdut = pdu_type(b0);
 376
 377     /* Develop the string to put in the Info column */
 378     cchInfo = snprintf(szInfo, sizeof( szInfo ), "WTP %s",
 379                     val_to_str(pdut, vals_pdu_type, "Unknown PDU type 0x%x"));
 380
 381     switch (pdut) {
 382         case INVOKE:
 383             fTTR = transmission_trailer(b0);
 384             TID = tvb_get_ntohs(tvb, offCur + 1);
 385             psn = 0;
 386             clsTransaction = transaction_class(tvb_get_guint8(tvb, offCur + 3));
 387             snprintf(szInfo + cchInfo, sizeof(szInfo) - cchInfo,
 388                      " Class %d", clsTransaction);
 389             cbHeader = 4;
 390             break;
 391
 392         case SEGMENTED_INVOKE:
 393         case SEGMENTED_RESULT:
 394             fTTR = transmission_trailer(b0);
 395             TID = tvb_get_ntohs(tvb, offCur + 1);
 396             psn = tvb_get_guint8(tvb, offCur + 3);
 397             cbHeader = 4;
 398             break;
 399
 400         case ABORT:
 401             cbHeader = 4;
 402             break;
 403
 404         case RESULT:
 405             fTTR = transmission_trailer(b0);
 406             TID = tvb_get_ntohs(tvb, offCur + 1);
 407             psn = 0;
 408             cbHeader = 3;
 409             break;
 410
 411         case ACK:
 412             cbHeader = 3;
 413             break;
 414
 415         case NEGATIVE_ACK:
 416             /* Variable number of missing packets */
 417             numMissing = tvb_get_guint8(tvb, offCur + 3);
 418             cbHeader = numMissing + 4;
 419             break;
 420
 421         default:
 422             break;
 423     };
 424     if (fRID) {
 425         strcat( szInfo, " R" );
 426     };
 427     if (fCon) {                         /* Scan variable part (TPI's),  */
 428                                         /* determine length of it       */
 429         unsigned char   tCon;
 430         unsigned char   tByte;
 431
 432         do {
 433             tByte = tvb_get_guint8(tvb, offCur + cbHeader + vHeader);
 434             tCon = tByte & 0x80;
 435             if (tByte & 0x04)   /* Long format  */
 436                 vHeader = vHeader + tvb_get_guint8(tvb,
 437                                         offCur + cbHeader + vHeader + 1) + 2;
 438             else
 439                 vHeader = vHeader + (tByte & 0x03) + 1;
 440         } while (tCon);
 441     }
 442
 443 #ifdef DEBUG
 444     fprintf( stderr, "dissect_wtp: cbHeader = %d\n", cbHeader );
 445 #endif
 446
 447     /* Only update "Info" column when no data in this PDU will
 448      * be handed off to a subsequent dissector.
 449      */
 450     if (check_col(pinfo->cinfo, COL_INFO) &&
 451         ((tvb_length_remaining(tvb, offCur + cbHeader + vHeader) <= 0) ||
 452          (pdut == ACK) || (pdut==NEGATIVE_ACK) || (pdut==ABORT)) ) {
 453 #ifdef DEBUG
 454         fprintf(stderr, "dissect_wtp: (6) About to set info_col header to %s\n", szInfo);
 455 #endif
 456         col_append_str(pinfo->cinfo, COL_INFO, szInfo);
 457     };
 458     /* In the interest of speed, if "tree" is NULL, don't do any work not
 459        necessary to generate protocol tree items. */
 460     if (tree) {
 461 #ifdef DEBUG
 462         fprintf(stderr, "dissect_wtp: cbHeader = %d\n", cbHeader);
 463 #endif
 464         ti = proto_tree_add_item(tree, proto_wtp, tvb, offCur, cbHeader + vHeader, bo_little_endian);
 465 #ifdef DEBUG
 466         fprintf(stderr, "dissect_wtp: (7) Returned from proto_tree_add_item\n");
 467 #endif
 468         wtp_tree = proto_item_add_subtree(ti, ett_wtp);
 469
 470 /* Code to process the packet goes here */
 471 #ifdef DEBUG
 472         fprintf(stderr, "dissect_wtp: cbHeader = %d\n", cbHeader);
 473         fprintf(stderr, "dissect_wtp: offCur = %d\n", offCur);
 474 #endif
 475         /* Add common items: only CON and PDU Type */
 476         proto_tree_add_item(
 477                         wtp_tree,                       /* tree */
 478                         hf_wtp_header_flag_continue,    /* id */
 479                         tvb,
 480                         offCur,                         /* start of highlight */
 481                         1,                              /* length of highlight*/
 482                         b0                              /* value */
 483              );
 484         proto_tree_add_item(wtp_tree, hf_wtp_header_pdu_type, tvb, offCur, 1, bo_little_endian);
 485
 486         switch(pdut) {
 487             case INVOKE:
 488                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian);
 489                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 490                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 491                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 492
 493                 proto_tree_add_item(wtp_tree, hf_wtp_header_Inv_version , tvb, offCur + 3, 1, bo_little_endian);
 494                 proto_tree_add_item(wtp_tree, hf_wtp_header_Inv_flag_TIDNew, tvb, offCur + 3, 1, bo_little_endian);
 495                 proto_tree_add_item(wtp_tree, hf_wtp_header_Inv_flag_UP, tvb, offCur + 3, 1, bo_little_endian);
 496                 proto_tree_add_item(wtp_tree, hf_wtp_header_Inv_Reserved, tvb, offCur + 3, 1, bo_little_endian);
 497                 proto_tree_add_item(wtp_tree, hf_wtp_header_Inv_TransactionClass, tvb, offCur + 3, 1, bo_little_endian);
 498                 break;
 499
 500             case RESULT:
 501                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian);
 502                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 503                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 504                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 505                 break;
 506
 507             case ACK:
 508                 proto_tree_add_item(wtp_tree, hf_wtp_header_Ack_flag_TVETOK, tvb, offCur, 1, bo_big_endian);
 509
 510                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 511                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 512                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 513                 break;
 514
 515             case ABORT:
 516                 abortType = tvb_get_guint8 (tvb, offCur) & 0x07;
 517                 proto_tree_add_item(wtp_tree, hf_wtp_header_Abort_type , tvb, offCur , 1, bo_little_endian);
 518                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 519                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 520
 521                 if (abortType == PROVIDER)
 522                 {
 523                     proto_tree_add_item( wtp_tree, hf_wtp_header_Abort_reason_provider , tvb, offCur + 3 , 1, bo_little_endian);
 524                 }
 525                 else if (abortType == USER)
 526                 {
 527                     proto_tree_add_item(wtp_tree, hf_wtp_header_Abort_reason_user , tvb, offCur + 3 , 1, bo_little_endian);
 528                 }
 529                 break;
 530
 531             case SEGMENTED_INVOKE:
 532                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian);
 533                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 534                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 535                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 536
 537                 proto_tree_add_item(wtp_tree, hf_wtp_header_sequence_number , tvb, offCur + 3, 1, bo_little_endian);
 538                 break;
 539
 540             case SEGMENTED_RESULT:
 541                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian);
 542                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 543                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 544                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 545
 546                 proto_tree_add_item(wtp_tree, hf_wtp_header_sequence_number , tvb, offCur + 3, 1, bo_little_endian);
 547                 break;
 548
 549             case NEGATIVE_ACK:
 550                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 551                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 552                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 553
 554                 proto_tree_add_item(wtp_tree, hf_wtp_header_missing_packets , tvb, offCur + 3, 1, bo_little_endian);
 555                 /* Iterate through missing packets */
 556                 for (i = 0; i < numMissing; i++)
 557                 {
 558                     proto_tree_add_item(wtp_tree, hf_wtp_header_sequence_number, tvb, offCur + i, 1, bo_little_endian);
 559                 }
 560                 break;
 561
 562             default:
 563                 break;
 564         };
 565         if (fCon) {                     /* Now, analyze variable part   */
 566             unsigned char        tCon;
 567             unsigned char        tByte;
 568             unsigned char        tpiLen;
 569             tvbuff_t            *tmp_tvb;
 570
 571             vHeader = 0;                /* Start scan all over  */
 572
 573             do {
 574                 tByte = tvb_get_guint8(tvb, offCur + cbHeader + vHeader);
 575                 tCon = tByte & 0x80;
 576                 if (tByte & 0x04)       /* Long TPI     */
 577                     tpiLen = 2 + tvb_get_guint8(tvb,
 578                                             offCur + cbHeader + vHeader + 1);
 579                 else
 580                     tpiLen = 1 + (tByte & 0x03);
 581                 tmp_tvb = tvb_new_subset(tvb, offCur + cbHeader + vHeader,
 582                                         tpiLen, tpiLen);
 583                 wtp_handle_tpi(wtp_tree, tmp_tvb);
 584                 vHeader += tpiLen;
 585             } while (tCon);
 586         } else {
 587                 /* There is no variable part */
 588         }       /* End of variable part of header */
 589     } else {
 590 #ifdef DEBUG
 591         fprintf(stderr, "dissect_wtp: (4) tree was %p\n", tree);
 592 #endif
 593     }
 594     /*
 595      * Any remaining data ought to be WSP data (if not WTP ACK, NACK
 596      * or ABORT pdu), so hand off (defragmented) to the WSP dissector
 597      */
 598     if ((tvb_length_remaining(tvb, offCur + cbHeader + vHeader) > 0) &&
 599         ! ((pdut==ACK) || (pdut==NEGATIVE_ACK) || (pdut==ABORT)))
 600     {
 601         int     dataOffset = offCur + cbHeader + vHeader;
 602         guint32 dataLen = tvb_length_remaining(tvb, offCur + cbHeader + vHeader);
 603         gboolean save_fragmented;
 604
 605         if ((pdut == SEGMENTED_INVOKE) || (pdut == SEGMENTED_RESULT) ||
 606             (((pdut == INVOKE) || (pdut == RESULT)) && (!fTTR)))
 607         {                                       /* 1st part of segment  */
 608             save_fragmented = pinfo->fragmented;
 609             pinfo->fragmented = TRUE;
 610             fd_head = fragment_add_seq(tvb, dataOffset, pinfo, TID,
 611                             wtp_fragment_table, psn, dataLen, !fTTR);
 612             if (fd_head != NULL)                /* Reassembled  */
 613             {
 614                 wsp_tvb = tvb_new_real_data(fd_head->data,
 615                                             fd_head->len,
 616                                             fd_head->len);
 617                 tvb_set_child_real_data_tvbuff(tvb, wsp_tvb);
 618                 add_new_data_source(pinfo, wsp_tvb,
 619                                         "Reassembled WTP");
 620                 pinfo->fragmented = FALSE;
 621
 622                 /* show all fragments */
 623                 show_fragment_seq_tree(fd_head, &wtp_frag_items,
 624                                         wtp_tree, pinfo, wsp_tvb);
 625
 626                 call_dissector(wsp_handle, wsp_tvb, pinfo, tree);
 627             }
 628             else
 629             {
 630                 if (check_col(pinfo->cinfo, COL_INFO))          /* Won't call WSP so display */
 631                     col_append_str(pinfo->cinfo, COL_INFO, szInfo);
 632             }
 633             pinfo->fragmented = save_fragmented;
 634         }
 635         else                    /* Normal packet, call next dissector   */
 636         {
 637             wsp_tvb = tvb_new_subset(tvb, dataOffset, -1, dataLen);
 638             call_dissector(wsp_handle, wsp_tvb, pinfo, tree);
 639         }
 640     }
 641 }
 642
 643 /*
 644  * Called directly from UDP.
 645  * Put "WTP+WSP" into the "Protocol" column.
 646  */
 647 static void
 648 dissect_wtp_fromudp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 649 {
 650     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 651         col_set_str(pinfo->cinfo, COL_PROTOCOL, "WTP+WSP" );
 652     if (check_col(pinfo->cinfo, COL_INFO))
 653         col_clear(pinfo->cinfo, COL_INFO);
 654
 655     dissect_wtp_common(tvb, pinfo, tree);
 656 }
 657
 658 /*
 659  * Called from a higher-level WAP dissector, presumably WTLS.
 660  * Put "WTLS+WSP+WTP" to the "Protocol" column.
 661  *
 662  * XXX - is this supposed to be called from WTLS?  If so, we're not
 663  * calling it....
 664  *
 665  * XXX - can this be called from any other dissector?
 666  */
 667 static void
 668 dissect_wtp_fromwap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 669 {
 670     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 671         col_set_str(pinfo->cinfo, COL_PROTOCOL, "WTLS+WTP+WSP" );
 672     if (check_col(pinfo->cinfo, COL_INFO))
 673         col_clear(pinfo->cinfo, COL_INFO);
 674
 675     dissect_wtp_common(tvb, pinfo, tree);
 676 }
 677
 678 /* Register the protocol with Ethereal */
 679 void
 680 proto_register_wtp(void)
 681 {
 682
 683     /* Setup list of header fields */
 684     static hf_register_info hf[] = {
 685         { &hf_wtp_header_sub_pdu_size,
 686             {   "Sub PDU size",
 687                 "wtp.sub_pdu_size",
 688                 FT_BYTES, BASE_HEX, NULL, 0x0,
 689                 "Size of Sub-PDU", HFILL
 690             }
 691         },
 692         { &hf_wtp_header_flag_continue,
 693             {   "Continue Flag",
 694                 "wtp.continue_flag",
 695                 FT_BOOLEAN, 8, TFS( &continue_truth ), 0x80,
 696                 "Continue Flag", HFILL
 697             }
 698         },
 699         { &hf_wtp_header_pdu_type,
 700             {   "PDU Type",
 701                 "wtp.pdu_type",
 702                 FT_UINT8, BASE_HEX, VALS( vals_pdu_type ), 0x78,
 703                 "PDU Type", HFILL
 704             }
 705         },
 706         { &hf_wtp_header_flag_Trailer,
 707             {   "Trailer Flags",
 708                 "wtp.trailer_flags",
 709                 FT_UINT8, BASE_HEX, VALS( vals_transaction_trailer ), 0x06,
 710                 "Trailer Flags", HFILL
 711             }
 712         },
 713         { &hf_wtp_header_flag_RID,
 714             {   "Re-transmission Indicator",
 715                 "wtp.RID",
 716                 FT_BOOLEAN, 8, TFS( &RID_truth ), 0x01,
 717                 "Re-transmission Indicator", HFILL
 718             }
 719         },
 720         { &hf_wtp_header_flag_TID_response,
 721             {   "TID Response",
 722                 "wtp.TID.response",
 723                 FT_BOOLEAN, 16, TFS( &tid_response_truth ), 0x8000,
 724                 "TID Response", HFILL
 725             }
 726         },
 727         { &hf_wtp_header_flag_TID,
 728             {   "Transaction ID",
 729                 "wtp.TID",
 730                 FT_UINT16, BASE_HEX, NULL, 0x7FFF,
 731                 "Transaction ID", HFILL
 732             }
 733         },
 734         { &hf_wtp_header_Inv_version,
 735             {   "Version",
 736                 "wtp.header.version",
 737                 FT_UINT8, BASE_HEX, VALS( vals_version ), 0xC0,
 738                 "Version", HFILL
 739             }
 740         },
 741         { &hf_wtp_header_Inv_flag_TIDNew,
 742             {   "TIDNew",
 743                 "wtp.header.TIDNew",
 744                 FT_BOOLEAN, 8, TFS( &TIDNew_truth ), 0x20,
 745                 "TIDNew", HFILL
 746             }
 747         },
 748         { &hf_wtp_header_Inv_flag_UP,
 749             {   "U/P flag",
 750                 "wtp.header.UP",
 751                 FT_BOOLEAN, 8, TFS( &UP_truth ), 0x10,
 752                 "U/P Flag", HFILL
 753             }
 754         },
 755         { &hf_wtp_header_Inv_Reserved,
 756             {   "Reserved",
 757                 "wtp.inv.reserved",
 758                 FT_UINT8, BASE_HEX, NULL, 0x0C,
 759                 "Reserved", HFILL
 760             }
 761         },
 762         { &hf_wtp_header_Inv_TransactionClass,
 763             {   "Transaction Class",
 764                 "wtp.inv.transaction_class",
 765                 FT_UINT8, BASE_HEX, VALS( vals_transaction_classes ), 0x03,
 766                 "Transaction Class", HFILL
 767             }
 768         },
 769         { &hf_wtp_header_Ack_flag_TVETOK,
 770             {   "Tve/Tok flag",
 771                 "wtp.ack.tvetok",
 772                 FT_BOOLEAN, 8, TFS( &TVETOK_truth ), 0x04,
 773                 "Tve/Tok flag", HFILL
 774             }
 775         },
 776         { &hf_wtp_header_Abort_type,
 777             {   "Abort Type",
 778                 "wtp.abort.type",
 779                 FT_UINT8, BASE_HEX, VALS ( vals_abort_type ), 0x07,
 780                 "Abort Type", HFILL
 781             }
 782         },
 783         { &hf_wtp_header_Abort_reason_provider,
 784             {   "Abort Reason",
 785                 "wtp.abort.reason.provider",
 786                 FT_UINT8, BASE_HEX, VALS ( vals_abort_reason_provider ), 0x00,
 787                 "Abort Reason", HFILL
 788             }
 789         },
 790         /* Assume WSP is the user and use its reason codes */
 791         { &hf_wtp_header_Abort_reason_user,
 792             {   "Abort Reason",
 793                 "wtp.abort.reason.user",
 794                 FT_UINT8, BASE_HEX, VALS ( vals_wsp_reason_codes ), 0x00,
 795                 "Abort Reason", HFILL
 796             }
 797         },
 798         { &hf_wtp_header_sequence_number,
 799             {   "Packet Sequence Number",
 800                 "wtp.header.sequence",
 801                 FT_UINT8, BASE_DEC, NULL, 0x00,
 802                 "Packet Sequence Number", HFILL
 803             }
 804         },
 805         { &hf_wtp_header_missing_packets,
 806             {   "Missing Packets",
 807                 "wtp.header.missing_packets",
 808                 FT_UINT8, BASE_DEC, NULL, 0x00,
 809                 "Missing Packets", HFILL
 810             }
 811         },
 812         { &hf_wtp_header_variable_part,
 813             {   "Header: Variable part",
 814                 "wtp.header_variable_part",
 815                 FT_BYTES, BASE_HEX, NULL, 0x0,
 816                 "Variable part of the header", HFILL
 817             }
 818         },
 819         { &hf_wtp_data,
 820             {   "Data",
 821                 "wtp.header_data",
 822                 FT_BYTES, BASE_HEX, NULL, 0x0,
 823                 "Data", HFILL
 824             }
 825         },
 826         { &hf_wtp_tpi_type,
 827             {   "TPI",
 828                 "wtp.tpi",
 829                 FT_UINT8, BASE_HEX, VALS(vals_tpi_type), 0x00,
 830                 "Identification of the Transport Information Item", HFILL
 831             }
 832         },
 833         { &hf_wtp_tpi_psn,
 834             {   "Packet sequence number",
 835                 "wtp.tpi.psn",
 836                 FT_UINT8, BASE_DEC, NULL, 0x00,
 837                 "Sequence number of this packet", HFILL
 838             }
 839         },
 840         { &hf_wtp_tpi_opt,
 841             {   "Option",
 842                 "wtp.tpi.opt",
 843                 FT_UINT8, BASE_HEX, VALS(vals_tpi_opt), 0x00,
 844                 "The given option for this TPI", HFILL
 845             }
 846         },
 847         { &hf_wtp_tpi_optval,
 848             {   "Option Value",
 849                 "wtp.tpi.opt.val",
 850                 FT_NONE, BASE_NONE, NULL, 0x00,
 851                 "The value that is supplied with this option", HFILL
 852             }
 853         },
 854         { &hf_wtp_tpi_info,
 855             {   "Information",
 856                 "wtp.tpi.info",
 857                 FT_NONE, BASE_NONE, NULL, 0x00,
 858                 "The information being send by this TPI", HFILL
 859             }
 860         },
 861
 862         /* Fragment fields */
 863         { &hf_wtp_fragment_overlap,
 864             {   "Fragment overlap",
 865                 "wtp.fragment.overlap",
 866                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 867                 "Fragment overlaps with other fragments", HFILL
 868             }
 869         },
 870         { &hf_wtp_fragment_overlap_conflict,
 871             {   "Conflicting data in fragment overlap",
 872                 "wtp.fragment.overlap.conflict",
 873                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 874                 "Overlapping fragments contained conflicting data", HFILL
 875             }
 876         },
 877         { &hf_wtp_fragment_multiple_tails,
 878             {   "Multiple tail fragments found",
 879                 "wtp.fragment.multipletails",
 880                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 881                 "Several tails were found when defragmenting the packet", HFILL
 882             }
 883         },
 884         { &hf_wtp_fragment_too_long_fragment,
 885             {   "Fragment too long",
 886                 "wtp.fragment.toolongfragment",
 887                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 888                 "Fragment contained data past end of packet", HFILL
 889             }
 890         },
 891         { &hf_wtp_fragment_error,
 892             {   "Defragmentation error",
 893                 "wtp.fragment.error",
 894                 FT_FRAMENUM, BASE_NONE, NULL, 0x0,
 895                 "Defragmentation error due to illegal fragments", HFILL
 896             }
 897         },
 898         { &hf_wtp_fragment,
 899             {   "WTP Fragment",
 900                 "wtp.fragment",
 901                 FT_FRAMENUM, BASE_NONE, NULL, 0x0,
 902                 "WTP Fragment", HFILL
 903             }
 904         },
 905         { &hf_wtp_fragments,
 906             {   "WTP Fragments",
 907                 "wtp.fragments",
 908                 FT_NONE, BASE_NONE, NULL, 0x0,
 909                 "WTP Fragments", HFILL
 910             }
 911         },
 912     };
 913
 914     /* Setup protocol subtree array */
 915     static gint *ett[] = {
 916         &ett_wtp,
 917         &ett_header,
 918         &ett_tpilist,
 919         &ett_wsp_fragments,
 920         &ett_wtp_fragment,
 921     };
 922
 923     /* Register the protocol name and description */
 924     proto_wtp = proto_register_protocol(
 925         "Wireless Transaction Protocol",   /* protocol name for use by ethereal */
 926         "WTP",                             /* short version of name */
 927         "wap-wsp-wtp"                      /* Abbreviated protocol name, should Match IANA
 928                                             < URL:http://www.isi.edu/in-notes/iana/assignments/port-numbers/ >
 929                                             */
 930     );
 931
 932     /* Required calls to register the header fields and subtrees used */
 933     proto_register_field_array(proto_wtp, hf, array_length(hf));
 934     proto_register_subtree_array(ett, array_length(ett));
 935
 936     register_dissector("wtp", dissect_wtp_fromwap, proto_wtp);
 937     register_dissector("wtp-udp", dissect_wtp_fromudp, proto_wtp);
 938     register_init_routine(wtp_defragment_init);
 939 };
 940
 941 void
 942 proto_reg_handoff_wtp(void)
 943 {
 944     dissector_handle_t wtp_fromudp_handle;
 945
 946     /*
 947      * Get a handle for the connection-oriented WSP dissector - if WTP
 948      * PDUs have data, it is WSP.
 949      */
 950     wsp_handle = find_dissector("wsp-co");
 951
 952     wtp_fromudp_handle = find_dissector("wtp-udp");
 953     dissector_add("udp.port", UDP_PORT_WTP_WSP, wtp_fromudp_handle);
 954 }