packet-wtp.c

   1 /* packet-wtp.c
   2  *
   3  * Routines to dissect WTP component of WAP traffic.
   4  *
   5  * $Id: packet-wtp.c,v 1.51 2003/07/29 22:10:18 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 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     NULL,
 217     "fragments"
 218 };
 219
 220 /* Handle for WSP dissector */
 221 static dissector_handle_t wsp_handle;
 222
 223 /*
 224  * reassembly of WSP
 225  */
 226 static GHashTable       *wtp_fragment_table = NULL;
 227
 228 static void
 229 wtp_defragment_init(void)
 230 {
 231     fragment_table_init(&wtp_fragment_table);
 232 }
 233
 234 /*
 235  * Extract some bitfields
 236  */
 237 #define pdu_type(octet)                 (((octet) >> 3) & 0x0F) /* Note pdu type must not be 0x00 */
 238 #define transaction_class(octet)        ((octet) & 0x03)        /* ......XX */
 239 #define transmission_trailer(octet)     (((octet) >> 1) & 0x01) /* ......X. */
 240
 241 static char retransmission_indicator(unsigned char octet)
 242 {
 243     switch (pdu_type(octet)) {
 244         case INVOKE:
 245         case RESULT:
 246         case ACK:
 247         case SEGMENTED_INVOKE:
 248         case SEGMENTED_RESULT:
 249         case NEGATIVE_ACK:
 250             return octet & 0x01;        /* .......X */
 251         default:
 252             return 0;
 253     }
 254 }
 255
 256 /*
 257  * dissect a TPI
 258  */
 259 static void
 260 wtp_handle_tpi(proto_tree *tree, tvbuff_t *tvb)
 261 {
 262     int                  offset = 0;
 263     unsigned char        tByte;
 264     unsigned char        tType;
 265     unsigned char        tLen;
 266     proto_item          *subTree = NULL;
 267
 268     tByte = tvb_get_guint8(tvb, offset++);
 269     tType = (tByte & 0x78) >> 3;
 270     if (tByte & 0x04)                           /* Long TPI     */
 271         tLen = tvb_get_guint8(tvb, offset++);
 272     else
 273         tLen = tByte & 0x03;
 274     subTree = proto_tree_add_uint(tree, hf_wtp_tpi_type,
 275                                   tvb, 0, tvb_length(tvb), tType);
 276     proto_item_add_subtree(subTree, ett_tpilist);
 277     switch (tType) {
 278         case 0x00:                      /* Error*/
 279             /* \todo    */
 280             break;
 281         case 0x01:                      /* Info */
 282             /* Beware, untested case here       */
 283             proto_tree_add_item(subTree, hf_wtp_tpi_info,
 284                                 tvb, offset, tLen, bo_little_endian);
 285             break;
 286         case 0x02:                      /* Option       */
 287             proto_tree_add_item(subTree, hf_wtp_tpi_opt,
 288                                 tvb, offset++, 1, bo_little_endian);
 289             proto_tree_add_item(subTree, hf_wtp_tpi_optval,
 290                                 tvb, offset, tLen - 1, bo_little_endian);
 291             break;
 292         case 0x03:                      /* PSN  */
 293             proto_tree_add_item(subTree, hf_wtp_tpi_psn,
 294                                 tvb, offset, 1, bo_little_endian);
 295             break;
 296         case 0x04:                      /* SDU boundary */
 297             /* \todo    */
 298             break;
 299         case 0x05:                      /* Frame boundary       */
 300             /* \todo    */
 301             break;
 302         default:
 303             break;
 304     }
 305 }
 306
 307 /* Code to actually dissect the packets */
 308 static void
 309 dissect_wtp_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 310 {
 311     static GString *szInfo = NULL;
 312     int         offCur          = 0; /* current offset from start of WTP data */
 313
 314     unsigned char  b0;
 315
 316     /* continuation flag */
 317     unsigned char       fCon;                   /* Continue flag        */
 318     unsigned char       fRID;                   /* Re-transmission indicator*/
 319     unsigned char       fTTR = '\0';            /* Transmission trailer */
 320     guint               cbHeader        = 0;    /* Fixed header length  */
 321     guint               vHeader         = 0;    /* Variable header length*/
 322     int                 abortType       = 0;
 323
 324     /* Set up structures we'll need to add the protocol subtree and manage it */
 325     proto_item          *ti;
 326     proto_tree          *wtp_tree = NULL;
 327
 328     char                pdut;
 329     char                clsTransaction  = ' ';
 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     if (szInfo == NULL)
 338         szInfo = g_string_sized_new(32);
 339
 340     b0 = tvb_get_guint8 (tvb, offCur + 0);
 341     /* Discover Concatenated PDUs */
 342     if (b0 == 0) {
 343         guint   c_fieldlen = 0;         /* Length of length-field       */
 344         guint   c_pdulen = 0;           /* Length of conc. PDU  */
 345
 346         if (tree) {
 347             ti = proto_tree_add_item(tree, proto_wtp,
 348                                     tvb, offCur, 1, bo_little_endian);
 349             wtp_tree = proto_item_add_subtree(ti, ett_wtp);
 350         }
 351         offCur = 1;
 352         i = 1;
 353         while (offCur < (int) tvb_reported_length(tvb)) {
 354             b0 = tvb_get_guint8(tvb, offCur + 0);
 355             if (b0 & 0x80) {
 356                 c_fieldlen = 2;
 357                 c_pdulen = ((b0 & 0x7f) << 8) | tvb_get_guint8(tvb, offCur + 1);
 358             } else {
 359                 c_fieldlen = 1;
 360                 c_pdulen = b0;
 361             }
 362             if (tree) {
 363                 proto_tree_add_uint(wtp_tree, hf_wtp_header_sub_pdu_size,
 364                                     tvb, offCur, c_fieldlen, c_pdulen);
 365             }
 366             if (i > 1 && check_col(pinfo->cinfo, COL_INFO)) {
 367                 col_append_str(pinfo->cinfo, COL_INFO, ", ");
 368             }
 369             wsp_tvb = tvb_new_subset(tvb, offCur + c_fieldlen, c_pdulen, c_pdulen);
 370             dissect_wtp_common(wsp_tvb, pinfo, wtp_tree);
 371             offCur += c_fieldlen + c_pdulen;
 372             i++;
 373         }
 374         return;
 375     }
 376     fCon = b0 & 0x80;
 377     fRID = retransmission_indicator(b0);
 378     pdut = pdu_type(b0);
 379
 380     /* Develop the string to put in the Info column */
 381     g_string_sprintf(szInfo, "WTP %s",
 382                     val_to_str(pdut, vals_pdu_type, "Unknown PDU type 0x%x"));
 383
 384     switch (pdut) {
 385         case INVOKE:
 386             fTTR = transmission_trailer(b0);
 387             TID = tvb_get_ntohs(tvb, offCur + 1);
 388             psn = 0;
 389             clsTransaction = transaction_class(tvb_get_guint8(tvb, offCur + 3));
 390             g_string_sprintfa(szInfo, " Class %d", clsTransaction);
 391             cbHeader = 4;
 392             break;
 393
 394         case SEGMENTED_INVOKE:
 395         case SEGMENTED_RESULT:
 396             fTTR = transmission_trailer(b0);
 397             TID = tvb_get_ntohs(tvb, offCur + 1);
 398             psn = tvb_get_guint8(tvb, offCur + 3);
 399             cbHeader = 4;
 400             break;
 401
 402         case ABORT:
 403             cbHeader = 4;
 404             break;
 405
 406         case RESULT:
 407             fTTR = transmission_trailer(b0);
 408             TID = tvb_get_ntohs(tvb, offCur + 1);
 409             psn = 0;
 410             cbHeader = 3;
 411             break;
 412
 413         case ACK:
 414             cbHeader = 3;
 415             break;
 416
 417         case NEGATIVE_ACK:
 418             /* Variable number of missing packets */
 419             numMissing = tvb_get_guint8(tvb, offCur + 3);
 420             cbHeader = numMissing + 4;
 421             break;
 422
 423         default:
 424             break;
 425     };
 426     if (fRID) {
 427         g_string_append( szInfo, " R" );
 428     };
 429     if (fCon) {                         /* Scan variable part (TPI's),  */
 430                                         /* determine length of it       */
 431         unsigned char   tCon;
 432         unsigned char   tByte;
 433
 434         do {
 435             tByte = tvb_get_guint8(tvb, offCur + cbHeader + vHeader);
 436             tCon = tByte & 0x80;
 437             if (tByte & 0x04)   /* Long format  */
 438                 vHeader = vHeader + tvb_get_guint8(tvb,
 439                                         offCur + cbHeader + vHeader + 1) + 2;
 440             else
 441                 vHeader = vHeader + (tByte & 0x03) + 1;
 442         } while (tCon);
 443     }
 444
 445 #ifdef DEBUG
 446     fprintf( stderr, "dissect_wtp: cbHeader = %d\n", cbHeader );
 447 #endif
 448
 449     /* Only update "Info" column when no data in this PDU will
 450      * be handed off to a subsequent dissector.
 451      */
 452     if (check_col(pinfo->cinfo, COL_INFO) &&
 453         ((tvb_length_remaining(tvb, offCur + cbHeader + vHeader) <= 0) ||
 454          (pdut == ACK) || (pdut==NEGATIVE_ACK) || (pdut==ABORT)) ) {
 455 #ifdef DEBUG
 456         fprintf(stderr, "dissect_wtp: (6) About to set info_col header to %s\n", szInfo->str);
 457 #endif
 458         col_append_str(pinfo->cinfo, COL_INFO, szInfo->str);
 459     };
 460     /* In the interest of speed, if "tree" is NULL, don't do any work not
 461        necessary to generate protocol tree items. */
 462     if (tree) {
 463 #ifdef DEBUG
 464         fprintf(stderr, "dissect_wtp: cbHeader = %d\n", cbHeader);
 465 #endif
 466         ti = proto_tree_add_item(tree, proto_wtp, tvb, offCur, cbHeader + vHeader, bo_little_endian);
 467 #ifdef DEBUG
 468         fprintf(stderr, "dissect_wtp: (7) Returned from proto_tree_add_item\n");
 469 #endif
 470         wtp_tree = proto_item_add_subtree(ti, ett_wtp);
 471
 472 /* Code to process the packet goes here */
 473 #ifdef DEBUG
 474         fprintf(stderr, "dissect_wtp: cbHeader = %d\n", cbHeader);
 475         fprintf(stderr, "dissect_wtp: offCur = %d\n", offCur);
 476 #endif
 477         /* Add common items: only CON and PDU Type */
 478         proto_tree_add_item(
 479                         wtp_tree,                       /* tree */
 480                         hf_wtp_header_flag_continue,    /* id */
 481                         tvb,
 482                         offCur,                         /* start of highlight */
 483                         1,                              /* length of highlight*/
 484                         b0                              /* value */
 485              );
 486         proto_tree_add_item(wtp_tree, hf_wtp_header_pdu_type, tvb, offCur, 1, bo_little_endian);
 487
 488         switch(pdut) {
 489             case INVOKE:
 490                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian);
 491                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 492                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 493                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 494
 495                 proto_tree_add_item(wtp_tree, hf_wtp_header_Inv_version , tvb, offCur + 3, 1, bo_little_endian);
 496                 proto_tree_add_item(wtp_tree, hf_wtp_header_Inv_flag_TIDNew, tvb, offCur + 3, 1, bo_little_endian);
 497                 proto_tree_add_item(wtp_tree, hf_wtp_header_Inv_flag_UP, tvb, offCur + 3, 1, bo_little_endian);
 498                 proto_tree_add_item(wtp_tree, hf_wtp_header_Inv_Reserved, tvb, offCur + 3, 1, bo_little_endian);
 499                 proto_tree_add_item(wtp_tree, hf_wtp_header_Inv_TransactionClass, tvb, offCur + 3, 1, bo_little_endian);
 500                 break;
 501
 502             case RESULT:
 503                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian);
 504                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 505                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 506                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 507                 break;
 508
 509             case ACK:
 510                 proto_tree_add_item(wtp_tree, hf_wtp_header_Ack_flag_TVETOK, tvb, offCur, 1, bo_big_endian);
 511
 512                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 513                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 514                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 515                 break;
 516
 517             case ABORT:
 518                 abortType = tvb_get_guint8 (tvb, offCur) & 0x07;
 519                 proto_tree_add_item(wtp_tree, hf_wtp_header_Abort_type , tvb, offCur , 1, bo_little_endian);
 520                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 521                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 522
 523                 if (abortType == PROVIDER)
 524                 {
 525                     proto_tree_add_item( wtp_tree, hf_wtp_header_Abort_reason_provider , tvb, offCur + 3 , 1, bo_little_endian);
 526                 }
 527                 else if (abortType == USER)
 528                 {
 529                     proto_tree_add_item(wtp_tree, hf_wtp_header_Abort_reason_user , tvb, offCur + 3 , 1, bo_little_endian);
 530                 }
 531                 break;
 532
 533             case SEGMENTED_INVOKE:
 534                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian);
 535                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 536                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 537                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 538
 539                 proto_tree_add_item(wtp_tree, hf_wtp_header_sequence_number , tvb, offCur + 3, 1, bo_little_endian);
 540                 break;
 541
 542             case SEGMENTED_RESULT:
 543                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_Trailer, tvb, offCur, 1, bo_little_endian);
 544                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 545                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 546                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 547
 548                 proto_tree_add_item(wtp_tree, hf_wtp_header_sequence_number , tvb, offCur + 3, 1, bo_little_endian);
 549                 break;
 550
 551             case NEGATIVE_ACK:
 552                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_RID, tvb, offCur, 1, bo_little_endian);
 553                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID_response, tvb, offCur + 1, 2, bo_big_endian);
 554                 proto_tree_add_item(wtp_tree, hf_wtp_header_flag_TID, tvb, offCur + 1, 2, bo_big_endian);
 555
 556                 proto_tree_add_item(wtp_tree, hf_wtp_header_missing_packets , tvb, offCur + 3, 1, bo_little_endian);
 557                 /* Iterate through missing packets */
 558                 for (i = 0; i < numMissing; i++)
 559                 {
 560                     proto_tree_add_item(wtp_tree, hf_wtp_header_sequence_number, tvb, offCur + 4 + i, 1, bo_little_endian);
 561                 }
 562                 break;
 563
 564             default:
 565                 break;
 566         };
 567         if (fCon) {                     /* Now, analyze variable part   */
 568             unsigned char        tCon;
 569             unsigned char        tByte;
 570             unsigned char        tpiLen;
 571             tvbuff_t            *tmp_tvb;
 572
 573             vHeader = 0;                /* Start scan all over  */
 574
 575             do {
 576                 tByte = tvb_get_guint8(tvb, offCur + cbHeader + vHeader);
 577                 tCon = tByte & 0x80;
 578                 if (tByte & 0x04)       /* Long TPI     */
 579                     tpiLen = 2 + tvb_get_guint8(tvb,
 580                                             offCur + cbHeader + vHeader + 1);
 581                 else
 582                     tpiLen = 1 + (tByte & 0x03);
 583                 tmp_tvb = tvb_new_subset(tvb, offCur + cbHeader + vHeader,
 584                                         tpiLen, tpiLen);
 585                 wtp_handle_tpi(wtp_tree, tmp_tvb);
 586                 vHeader += tpiLen;
 587             } while (tCon);
 588         } else {
 589                 /* There is no variable part */
 590         }       /* End of variable part of header */
 591     } else {
 592 #ifdef DEBUG
 593         fprintf(stderr, "dissect_wtp: (4) tree was %p\n", tree);
 594 #endif
 595     }
 596     /*
 597      * Any remaining data ought to be WSP data (if not WTP ACK, NACK
 598      * or ABORT pdu), so hand off (defragmented) to the WSP dissector
 599      */
 600     if ((tvb_reported_length_remaining(tvb, offCur + cbHeader + vHeader) > 0) &&
 601         ! ((pdut==ACK) || (pdut==NEGATIVE_ACK) || (pdut==ABORT)))
 602     {
 603         int     dataOffset = offCur + cbHeader + vHeader;
 604         gint    dataLen = tvb_reported_length_remaining(tvb, dataOffset);
 605         gboolean save_fragmented;
 606
 607         if (((pdut == SEGMENTED_INVOKE) || (pdut == SEGMENTED_RESULT) ||
 608             (((pdut == INVOKE) || (pdut == RESULT)) && (!fTTR))) &&
 609             tvb_bytes_exist(tvb, dataOffset, dataLen))
 610         {                                       /* 1st part of segment  */
 611             save_fragmented = pinfo->fragmented;
 612             pinfo->fragmented = TRUE;
 613             fd_head = fragment_add_seq(tvb, dataOffset, pinfo, TID,
 614                             wtp_fragment_table, psn, dataLen, !fTTR);
 615             if (fd_head != NULL)                /* Reassembled  */
 616             {
 617                 /* Reassembly is complete; show the reassembled PDU */
 618                 wsp_tvb = tvb_new_real_data(fd_head->data,
 619                                             fd_head->len,
 620                                             fd_head->len);
 621                 tvb_set_child_real_data_tvbuff(tvb, wsp_tvb);
 622                 add_new_data_source(pinfo, wsp_tvb,
 623                                         "Reassembled WTP");
 624                 pinfo->fragmented = FALSE;
 625
 626                 /* show all fragments */
 627                 show_fragment_seq_tree(fd_head, &wtp_frag_items,
 628                                         wtp_tree, pinfo, wsp_tvb);
 629
 630                 call_dissector(wsp_handle, wsp_tvb, pinfo, tree);
 631             }
 632             else
 633             {
 634                 /* Reassembly isn't complete; just show the fragment */
 635                 if (check_col(pinfo->cinfo, COL_INFO))          /* Won't call WSP so display */
 636                     col_append_str(pinfo->cinfo, COL_INFO, szInfo->str);
 637                 if (tree != NULL)
 638                     proto_tree_add_text(wtp_tree, tvb, dataOffset, -1, "Payload");
 639             }
 640             pinfo->fragmented = save_fragmented;
 641         }
 642         else
 643         {
 644             /*
 645              * Normal packet, or not all the fragment data is available;
 646              * call next dissector, unless this is a segment of a
 647              * segmented invoke or result and isn't the first segment.
 648              */
 649             if ((pdut == SEGMENTED_INVOKE || pdut == SEGMENTED_RESULT) &&
 650                         psn != 0) {
 651                 /*
 652                  * This is a segmented invoke or result, and not the first
 653                  * segment; just show it as a segmented invoke or result,
 654                  * don't try to dissect its payload.
 655                  */
 656                 if (check_col(pinfo->cinfo, COL_INFO))
 657                     col_add_fstr(pinfo->cinfo, COL_INFO,
 658                                  "WTP %s (%u)",
 659                                  (pdut == SEGMENTED_INVOKE ?
 660                                   "Segmented Invoke" : "Segmented Result"),
 661                                  psn);
 662                 if (tree != NULL)
 663                     proto_tree_add_text(wtp_tree, tvb, dataOffset, -1, "Payload");
 664             } else {
 665                 wsp_tvb = tvb_new_subset(tvb, dataOffset, -1, -1);
 666                 call_dissector(wsp_handle, wsp_tvb, pinfo, tree);
 667             }
 668         }
 669     }
 670 }
 671
 672 /*
 673  * Called directly from UDP.
 674  * Put "WTP+WSP" into the "Protocol" column.
 675  */
 676 static void
 677 dissect_wtp_fromudp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 678 {
 679     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 680         col_set_str(pinfo->cinfo, COL_PROTOCOL, "WTP+WSP" );
 681     if (check_col(pinfo->cinfo, COL_INFO))
 682         col_clear(pinfo->cinfo, COL_INFO);
 683
 684     dissect_wtp_common(tvb, pinfo, tree);
 685 }
 686
 687 /*
 688  * Called from a higher-level WAP dissector, presumably WTLS.
 689  * Put "WTLS+WSP+WTP" to the "Protocol" column.
 690  *
 691  * XXX - is this supposed to be called from WTLS?  If so, we're not
 692  * calling it....
 693  *
 694  * XXX - can this be called from any other dissector?
 695  */
 696 static void
 697 dissect_wtp_fromwap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 698 {
 699     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 700         col_set_str(pinfo->cinfo, COL_PROTOCOL, "WTLS+WTP+WSP" );
 701     if (check_col(pinfo->cinfo, COL_INFO))
 702         col_clear(pinfo->cinfo, COL_INFO);
 703
 704     dissect_wtp_common(tvb, pinfo, tree);
 705 }
 706
 707 /* Register the protocol with Ethereal */
 708 void
 709 proto_register_wtp(void)
 710 {
 711
 712     /* Setup list of header fields */
 713     static hf_register_info hf[] = {
 714         { &hf_wtp_header_sub_pdu_size,
 715             {   "Sub PDU size",
 716                 "wtp.sub_pdu_size",
 717                 FT_UINT16, BASE_DEC, NULL, 0x0,
 718                 "Size of Sub-PDU (bytes)", HFILL
 719             }
 720         },
 721         { &hf_wtp_header_flag_continue,
 722             {   "Continue Flag",
 723                 "wtp.continue_flag",
 724                 FT_BOOLEAN, 8, TFS( &continue_truth ), 0x80,
 725                 "Continue Flag", HFILL
 726             }
 727         },
 728         { &hf_wtp_header_pdu_type,
 729             {   "PDU Type",
 730                 "wtp.pdu_type",
 731                 FT_UINT8, BASE_HEX, VALS( vals_pdu_type ), 0x78,
 732                 "PDU Type", HFILL
 733             }
 734         },
 735         { &hf_wtp_header_flag_Trailer,
 736             {   "Trailer Flags",
 737                 "wtp.trailer_flags",
 738                 FT_UINT8, BASE_HEX, VALS( vals_transaction_trailer ), 0x06,
 739                 "Trailer Flags", HFILL
 740             }
 741         },
 742         { &hf_wtp_header_flag_RID,
 743             {   "Re-transmission Indicator",
 744                 "wtp.RID",
 745                 FT_BOOLEAN, 8, TFS( &RID_truth ), 0x01,
 746                 "Re-transmission Indicator", HFILL
 747             }
 748         },
 749         { &hf_wtp_header_flag_TID_response,
 750             {   "TID Response",
 751                 "wtp.TID.response",
 752                 FT_BOOLEAN, 16, TFS( &tid_response_truth ), 0x8000,
 753                 "TID Response", HFILL
 754             }
 755         },
 756         { &hf_wtp_header_flag_TID,
 757             {   "Transaction ID",
 758                 "wtp.TID",
 759                 FT_UINT16, BASE_HEX, NULL, 0x7FFF,
 760                 "Transaction ID", HFILL
 761             }
 762         },
 763         { &hf_wtp_header_Inv_version,
 764             {   "Version",
 765                 "wtp.header.version",
 766                 FT_UINT8, BASE_HEX, VALS( vals_version ), 0xC0,
 767                 "Version", HFILL
 768             }
 769         },
 770         { &hf_wtp_header_Inv_flag_TIDNew,
 771             {   "TIDNew",
 772                 "wtp.header.TIDNew",
 773                 FT_BOOLEAN, 8, TFS( &TIDNew_truth ), 0x20,
 774                 "TIDNew", HFILL
 775             }
 776         },
 777         { &hf_wtp_header_Inv_flag_UP,
 778             {   "U/P flag",
 779                 "wtp.header.UP",
 780                 FT_BOOLEAN, 8, TFS( &UP_truth ), 0x10,
 781                 "U/P Flag", HFILL
 782             }
 783         },
 784         { &hf_wtp_header_Inv_Reserved,
 785             {   "Reserved",
 786                 "wtp.inv.reserved",
 787                 FT_UINT8, BASE_HEX, NULL, 0x0C,
 788                 "Reserved", HFILL
 789             }
 790         },
 791         { &hf_wtp_header_Inv_TransactionClass,
 792             {   "Transaction Class",
 793                 "wtp.inv.transaction_class",
 794                 FT_UINT8, BASE_HEX, VALS( vals_transaction_classes ), 0x03,
 795                 "Transaction Class", HFILL
 796             }
 797         },
 798         { &hf_wtp_header_Ack_flag_TVETOK,
 799             {   "Tve/Tok flag",
 800                 "wtp.ack.tvetok",
 801                 FT_BOOLEAN, 8, TFS( &TVETOK_truth ), 0x04,
 802                 "Tve/Tok flag", HFILL
 803             }
 804         },
 805         { &hf_wtp_header_Abort_type,
 806             {   "Abort Type",
 807                 "wtp.abort.type",
 808                 FT_UINT8, BASE_HEX, VALS ( vals_abort_type ), 0x07,
 809                 "Abort Type", HFILL
 810             }
 811         },
 812         { &hf_wtp_header_Abort_reason_provider,
 813             {   "Abort Reason",
 814                 "wtp.abort.reason.provider",
 815                 FT_UINT8, BASE_HEX, VALS ( vals_abort_reason_provider ), 0x00,
 816                 "Abort Reason", HFILL
 817             }
 818         },
 819         /* Assume WSP is the user and use its reason codes */
 820         { &hf_wtp_header_Abort_reason_user,
 821             {   "Abort Reason",
 822                 "wtp.abort.reason.user",
 823                 FT_UINT8, BASE_HEX, VALS ( vals_wsp_reason_codes ), 0x00,
 824                 "Abort Reason", HFILL
 825             }
 826         },
 827         { &hf_wtp_header_sequence_number,
 828             {   "Packet Sequence Number",
 829                 "wtp.header.sequence",
 830                 FT_UINT8, BASE_DEC, NULL, 0x00,
 831                 "Packet Sequence Number", HFILL
 832             }
 833         },
 834         { &hf_wtp_header_missing_packets,
 835             {   "Missing Packets",
 836                 "wtp.header.missing_packets",
 837                 FT_UINT8, BASE_DEC, NULL, 0x00,
 838                 "Missing Packets", HFILL
 839             }
 840         },
 841         { &hf_wtp_header_variable_part,
 842             {   "Header: Variable part",
 843                 "wtp.header_variable_part",
 844                 FT_BYTES, BASE_HEX, NULL, 0x0,
 845                 "Variable part of the header", HFILL
 846             }
 847         },
 848         { &hf_wtp_data,
 849             {   "Data",
 850                 "wtp.header_data",
 851                 FT_BYTES, BASE_HEX, NULL, 0x0,
 852                 "Data", HFILL
 853             }
 854         },
 855         { &hf_wtp_tpi_type,
 856             {   "TPI",
 857                 "wtp.tpi",
 858                 FT_UINT8, BASE_HEX, VALS(vals_tpi_type), 0x00,
 859                 "Identification of the Transport Information Item", HFILL
 860             }
 861         },
 862         { &hf_wtp_tpi_psn,
 863             {   "Packet sequence number",
 864                 "wtp.tpi.psn",
 865                 FT_UINT8, BASE_DEC, NULL, 0x00,
 866                 "Sequence number of this packet", HFILL
 867             }
 868         },
 869         { &hf_wtp_tpi_opt,
 870             {   "Option",
 871                 "wtp.tpi.opt",
 872                 FT_UINT8, BASE_HEX, VALS(vals_tpi_opt), 0x00,
 873                 "The given option for this TPI", HFILL
 874             }
 875         },
 876         { &hf_wtp_tpi_optval,
 877             {   "Option Value",
 878                 "wtp.tpi.opt.val",
 879                 FT_NONE, BASE_NONE, NULL, 0x00,
 880                 "The value that is supplied with this option", HFILL
 881             }
 882         },
 883         { &hf_wtp_tpi_info,
 884             {   "Information",
 885                 "wtp.tpi.info",
 886                 FT_NONE, BASE_NONE, NULL, 0x00,
 887                 "The information being send by this TPI", HFILL
 888             }
 889         },
 890
 891         /* Fragment fields */
 892         { &hf_wtp_fragment_overlap,
 893             {   "Fragment overlap",
 894                 "wtp.fragment.overlap",
 895                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 896                 "Fragment overlaps with other fragments", HFILL
 897             }
 898         },
 899         { &hf_wtp_fragment_overlap_conflict,
 900             {   "Conflicting data in fragment overlap",
 901                 "wtp.fragment.overlap.conflict",
 902                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 903                 "Overlapping fragments contained conflicting data", HFILL
 904             }
 905         },
 906         { &hf_wtp_fragment_multiple_tails,
 907             {   "Multiple tail fragments found",
 908                 "wtp.fragment.multipletails",
 909                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 910                 "Several tails were found when defragmenting the packet", HFILL
 911             }
 912         },
 913         { &hf_wtp_fragment_too_long_fragment,
 914             {   "Fragment too long",
 915                 "wtp.fragment.toolongfragment",
 916                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
 917                 "Fragment contained data past end of packet", HFILL
 918             }
 919         },
 920         { &hf_wtp_fragment_error,
 921             {   "Defragmentation error",
 922                 "wtp.fragment.error",
 923                 FT_FRAMENUM, BASE_NONE, NULL, 0x0,
 924                 "Defragmentation error due to illegal fragments", HFILL
 925             }
 926         },
 927         { &hf_wtp_fragment,
 928             {   "WTP Fragment",
 929                 "wtp.fragment",
 930                 FT_FRAMENUM, BASE_NONE, NULL, 0x0,
 931                 "WTP Fragment", HFILL
 932             }
 933         },
 934         { &hf_wtp_fragments,
 935             {   "WTP Fragments",
 936                 "wtp.fragments",
 937                 FT_NONE, BASE_NONE, NULL, 0x0,
 938                 "WTP Fragments", HFILL
 939             }
 940         },
 941     };
 942
 943     /* Setup protocol subtree array */
 944     static gint *ett[] = {
 945         &ett_wtp,
 946         &ett_header,
 947         &ett_tpilist,
 948         &ett_wsp_fragments,
 949         &ett_wtp_fragment,
 950     };
 951
 952     /* Register the protocol name and description */
 953     proto_wtp = proto_register_protocol(
 954         "Wireless Transaction Protocol",   /* protocol name for use by ethereal */
 955         "WTP",                             /* short version of name */
 956         "wap-wsp-wtp"                      /* Abbreviated protocol name, should Match IANA
 957                                             < URL:http://www.isi.edu/in-notes/iana/assignments/port-numbers/ >
 958                                             */
 959     );
 960
 961     /* Required calls to register the header fields and subtrees used */
 962     proto_register_field_array(proto_wtp, hf, array_length(hf));
 963     proto_register_subtree_array(ett, array_length(ett));
 964
 965     register_dissector("wtp", dissect_wtp_fromwap, proto_wtp);
 966     register_dissector("wtp-udp", dissect_wtp_fromudp, proto_wtp);
 967     register_init_routine(wtp_defragment_init);
 968 };
 969
 970 void
 971 proto_reg_handoff_wtp(void)
 972 {
 973     dissector_handle_t wtp_fromudp_handle;
 974
 975     /*
 976      * Get a handle for the connection-oriented WSP dissector - if WTP
 977      * PDUs have data, it is WSP.
 978      */
 979     wsp_handle = find_dissector("wsp-co");
 980
 981     wtp_fromudp_handle = find_dissector("wtp-udp");
 982     dissector_add("udp.port", UDP_PORT_WTP_WSP, wtp_fromudp_handle);
 983     dissector_add("smpp.udh.port", UDP_PORT_WTP_WSP, wtp_fromudp_handle);
 984 }