epan/dissectors/packet-t38.c

   1 /* Do not modify this file.                                                   */
   2 /* It is created automatically by the ASN.1 to Wireshark dissector compiler   */
   3 /* packet-t38.c                                                               */
   4 /* ../../tools/asn2wrs.py -p t38 -c ./t38.cnf -s ./packet-t38-template -D . T38_2002.asn */
   5
   6 /* Input file: packet-t38-template.c */
   7
   8 #line 1 "packet-t38-template.c"
   9 /* packet-t38.c
  10  * Routines for T.38 packet dissection
  11  * 2003  Hans Viens
  12  * 2004  Alejandro Vaquero, add support Conversations for SDP
  13  * 2006  Alejandro Vaquero, add T30 reassemble and dissection
  14  *
  15  * $Id$
  16  *
  17  * Wireshark - Network traffic analyzer
  18  * By Gerald Combs <gerald@wireshark.org>
  19  * Copyright 1998 Gerald Combs
  20  *
  21  * This program is free software; you can redistribute it and/or
  22  * modify it under the terms of the GNU General Public License
  23  * as published by the Free Software Foundation; either version 2
  24  * of the License, or (at your option) any later version.
  25  *
  26  * This program is distributed in the hope that it will be useful,
  27  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  29  * GNU General Public License for more details.
  30  *
  31  * You should have received a copy of the GNU General Public License
  32  * along with this program; if not, write to the Free Software
  33  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  34  */
  35
  36
  37 /* Depending on what ASN.1 specification is used you may have to change
  38  * the preference setting regarding Pre-Corrigendum ASN.1 specification:
  39  * http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/1998/T38.html  (Pre-Corrigendum=TRUE)
  40  * http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2003/T38(1998).html (Pre-Corrigendum=TRUE)
  41  *
  42  * http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2003/T38(2002).html (Pre-Corrigendum=FALSE)
  43  * http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2002/t38.html  (Pre-Corrigendum=FALSE)
  44  * http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2002-Amd1/T38.html (Pre-Corrigendum=FALSE)
  45  */
  46
  47 /* TO DO:
  48  * - TCP desegmentation is currently not supported for T.38 IFP directly over TCP.
  49  * - H.245 dissectors should be updated to start conversations for T.38 similar to RTP.
  50  * - Sometimes the last octet is not high-lighted when selecting something in the tree. Bug in PER dissector?
  51  * - Add support for RTP payload audio/t38 (draft-jones-avt-audio-t38-03.txt), i.e. T38 in RTP packets.
  52  */
  53
  54
  55 #ifdef HAVE_CONFIG_H
  56 # include "config.h"
  57 #endif
  58
  59 #include <glib.h>
  60 #include <epan/packet.h>
  61 #include <epan/reassemble.h>
  62 #include <epan/conversation.h>
  63 #include <epan/tap.h>
  64 #include <epan/expert.h>
  65
  66 #include <stdio.h>
  67 #include <string.h>
  68
  69 #include "packet-t38.h"
  70 #include <epan/prefs.h>
  71 #include <epan/ipproto.h>
  72 #include <epan/asn1.h>
  73 #include "packet-per.h"
  74 #include "packet-tpkt.h"
  75 #include <epan/emem.h>
  76
  77 #define PORT_T38 6004
  78 static guint global_t38_tcp_port = PORT_T38;
  79 static guint global_t38_udp_port = PORT_T38;
  80
  81 static int t38_tap = -1;
  82
  83 /*
  84 * Variables to allow for proper deletion of dissector registration when
  85 * the user changes port from the gui.
  86 */
  87 static guint tcp_port = 0;
  88 static guint udp_port = 0;
  89
  90 /* dissect using the Pre Corrigendum T.38 ASN.1 specification (1998) */
  91 static gboolean use_pre_corrigendum_asn1_specification = TRUE;
  92
  93 /* dissect packets that looks like RTP version 2 packets as RTP     */
  94 /* instead of as T.38. This may result in that some T.38 UPTL       */
  95 /* packets with sequence number values higher than 32767 may be     */
  96 /* shown as RTP packets.                                            */
  97 static gboolean dissect_possible_rtpv2_packets_as_rtp = FALSE;
  98
  99
 100 /* Reassembly of T.38 PDUs over TPKT over TCP */
 101 static gboolean t38_tpkt_reassembly = TRUE;
 102
 103 /* Preference setting whether TPKT header is used when sending T.38 over TCP.
 104  * The default setting is Maybe where the dissector will look on the first
 105  * bytes to try to determine whether TPKT header is used or not. This may not
 106  * work so well in some cases. You may want to change the setting to Always or
 107  * Newer.
 108  */
 109 #define T38_TPKT_NEVER 0   /* Assume that there is never a TPKT header    */
 110 #define T38_TPKT_ALWAYS 1  /* Assume that there is always a TPKT header   */
 111 #define T38_TPKT_MAYBE 2   /* Assume TPKT if first octets are 03-00-xx-xx */
 112 static gint t38_tpkt_usage = T38_TPKT_MAYBE;
 113
 114 static const enum_val_t t38_tpkt_options[] = {
 115   {"never", "Never", T38_TPKT_NEVER},
 116   {"always", "Always", T38_TPKT_ALWAYS},
 117   {"maybe", "Maybe", T38_TPKT_MAYBE},
 118   {NULL, NULL, -1}
 119 };
 120
 121
 122
 123 /* T38 */
 124 static dissector_handle_t t38_udp_handle;
 125 static dissector_handle_t t38_tcp_handle;
 126 static dissector_handle_t t38_tcp_pdu_handle;
 127 static dissector_handle_t rtp_handle;
 128 static dissector_handle_t t30_hdlc_handle;
 129 static dissector_handle_t data_handle;
 130
 131 static guint32 Type_of_msg_value;
 132 static guint32 Data_Field_field_type_value;
 133 static guint32 Data_value;
 134 static guint32 T30ind_value;
 135 static guint32 Data_Field_item_num;
 136
 137 static int proto_t38 = -1;
 138
 139 /*--- Included file: packet-t38-hf.c ---*/
 140 #line 1 "packet-t38-hf.c"
 141 static int hf_t38_IFPPacket_PDU = -1;             /* IFPPacket */
 142 static int hf_t38_UDPTLPacket_PDU = -1;           /* UDPTLPacket */
 143 static int hf_t38_type_of_msg = -1;               /* Type_of_msg */
 144 static int hf_t38_data_field = -1;                /* Data_Field */
 145 static int hf_t38_t30_indicator = -1;             /* T30_indicator */
 146 static int hf_t38_t30_data = -1;                  /* T30_data */
 147 static int hf_t38_Data_Field_item = -1;           /* Data_Field_item */
 148 static int hf_t38_field_type = -1;                /* T_field_type */
 149 static int hf_t38_field_data = -1;                /* T_field_data */
 150 static int hf_t38_seq_number = -1;                /* T_seq_number */
 151 static int hf_t38_primary_ifp_packet = -1;        /* T_primary_ifp_packet */
 152 static int hf_t38_error_recovery = -1;            /* T_error_recovery */
 153 static int hf_t38_secondary_ifp_packets = -1;     /* T_secondary_ifp_packets */
 154 static int hf_t38_secondary_ifp_packets_item = -1;  /* OpenType_IFPPacket */
 155 static int hf_t38_fec_info = -1;                  /* T_fec_info */
 156 static int hf_t38_fec_npackets = -1;              /* INTEGER */
 157 static int hf_t38_fec_data = -1;                  /* T_fec_data */
 158 static int hf_t38_fec_data_item = -1;             /* OCTET_STRING */
 159
 160 /*--- End of included file: packet-t38-hf.c ---*/
 161 #line 131 "packet-t38-template.c"
 162
 163 /* T38 setup fields */
 164 static int hf_t38_setup        = -1;
 165 static int hf_t38_setup_frame  = -1;
 166 static int hf_t38_setup_method = -1;
 167
 168 /* T38 Data reassemble fields */
 169 static int hf_data_fragments = -1;
 170 static int hf_data_fragment = -1;
 171 static int hf_data_fragment_overlap = -1;
 172 static int hf_data_fragment_overlap_conflicts = -1;
 173 static int hf_data_fragment_multiple_tails = -1;
 174 static int hf_data_fragment_too_long_fragment = -1;
 175 static int hf_data_fragment_error = -1;
 176 static int hf_data_reassembled_in = -1;
 177
 178 static gint ett_t38 = -1;
 179
 180 /*--- Included file: packet-t38-ett.c ---*/
 181 #line 1 "packet-t38-ett.c"
 182 static gint ett_t38_IFPPacket = -1;
 183 static gint ett_t38_Type_of_msg = -1;
 184 static gint ett_t38_Data_Field = -1;
 185 static gint ett_t38_Data_Field_item = -1;
 186 static gint ett_t38_UDPTLPacket = -1;
 187 static gint ett_t38_T_error_recovery = -1;
 188 static gint ett_t38_T_secondary_ifp_packets = -1;
 189 static gint ett_t38_T_fec_info = -1;
 190 static gint ett_t38_T_fec_data = -1;
 191
 192 /*--- End of included file: packet-t38-ett.c ---*/
 193 #line 149 "packet-t38-template.c"
 194 static gint ett_t38_setup = -1;
 195
 196 static gint ett_data_fragment = -1;
 197 static gint ett_data_fragments = -1;
 198
 199 static gboolean primary_part = TRUE;
 200 static guint32 seq_number = 0;
 201
 202 /* Tables for reassembly of Data fragments. */
 203 static GHashTable *data_fragment_table = NULL;
 204 static GHashTable *data_reassembled_table = NULL;
 205
 206 static const fragment_items data_frag_items = {
 207         /* Fragment subtrees */
 208         &ett_data_fragment,
 209         &ett_data_fragments,
 210         /* Fragment fields */
 211         &hf_data_fragments,
 212         &hf_data_fragment,
 213         &hf_data_fragment_overlap,
 214         &hf_data_fragment_overlap_conflicts,
 215         &hf_data_fragment_multiple_tails,
 216         &hf_data_fragment_too_long_fragment,
 217         &hf_data_fragment_error,
 218         /* Reassembled in field */
 219         &hf_data_reassembled_in,
 220         /* Tag */
 221         "Data fragments"
 222 };
 223
 224 typedef struct _fragment_key {
 225         address src;
 226         address dst;
 227         guint32 id;
 228 } fragment_key;
 229
 230 static conversation_t *p_conv= NULL;
 231 static t38_conv *p_t38_conv = NULL;
 232 static t38_conv *p_t38_packet_conv = NULL;
 233 static t38_conv_info *p_t38_conv_info = NULL;
 234 static t38_conv_info *p_t38_packet_conv_info = NULL;
 235
 236 /* RTP Version is the first 2 bits of the first octet in the UDP payload*/
 237 #define RTP_VERSION(octet)      ((octet) >> 6)
 238
 239 void proto_reg_handoff_t38(void);
 240
 241 static void show_setup_info(tvbuff_t *tvb, proto_tree *tree, t38_conv *p_t38_conv);
 242 /* Preferences bool to control whether or not setup info should be shown */
 243 static gboolean global_t38_show_setup_info = TRUE;
 244
 245 /* Can tap up to 4 T38 packets within same packet */
 246 /* We only tap the primary part, not the redundancy */
 247 #define MAX_T38_MESSAGES_IN_PACKET 4
 248 static t38_packet_info t38_info_arr[MAX_T38_MESSAGES_IN_PACKET];
 249 static int t38_info_current=0;
 250 static t38_packet_info *t38_info=NULL;
 251
 252 static void t38_defragment_init(void)
 253 {
 254         /* Init reassemble tables */
 255         fragment_table_init(&data_fragment_table);
 256         reassembled_table_init(&data_reassembled_table);
 257 }
 258
 259
 260 /* Set up an T38 conversation */
 261 void t38_add_address(packet_info *pinfo,
 262                      address *addr, int port,
 263                      int other_port,
 264                      const gchar *setup_method, guint32 setup_frame_number)
 265 {
 266         address null_addr;
 267         conversation_t* p_conv;
 268         t38_conv* p_conv_data = NULL;
 269
 270         /*
 271          * If this isn't the first time this packet has been processed,
 272          * we've already done this work, so we don't need to do it
 273          * again.
 274          */
 275         if (pinfo->fd->flags.visited)
 276         {
 277                 return;
 278         }
 279
 280         SET_ADDRESS(&null_addr, AT_NONE, 0, NULL);
 281
 282         /*
 283          * Check if the ip address and port combination is not
 284          * already registered as a conversation.
 285          */
 286         p_conv = find_conversation( setup_frame_number, addr, &null_addr, PT_UDP, port, other_port,
 287                                 NO_ADDR_B | (!other_port ? NO_PORT_B : 0));
 288
 289         /*
 290          * If not, create a new conversation.
 291          */
 292         if ( !p_conv || p_conv->setup_frame != setup_frame_number) {
 293                 p_conv = conversation_new( setup_frame_number, addr, &null_addr, PT_UDP,
 294                                            (guint32)port, (guint32)other_port,
 295                                                                    NO_ADDR2 | (!other_port ? NO_PORT2 : 0));
 296         }
 297
 298         /* Set dissector */
 299         conversation_set_dissector(p_conv, t38_udp_handle);
 300
 301         /*
 302          * Check if the conversation has data associated with it.
 303          */
 304         p_conv_data = conversation_get_proto_data(p_conv, proto_t38);
 305
 306         /*
 307          * If not, add a new data item.
 308          */
 309         if ( ! p_conv_data ) {
 310                 /* Create conversation data */
 311                 p_conv_data = se_alloc(sizeof(t38_conv));
 312
 313                 conversation_add_proto_data(p_conv, proto_t38, p_conv_data);
 314         }
 315
 316         /*
 317          * Update the conversation data.
 318          */
 319         strncpy(p_conv_data->setup_method, setup_method, MAX_T38_SETUP_METHOD_SIZE);
 320         p_conv_data->setup_method[MAX_T38_SETUP_METHOD_SIZE] = '\0';
 321         p_conv_data->setup_frame_number = setup_frame_number;
 322                 p_conv_data->src_t38_info.reass_ID = 0;
 323                 p_conv_data->src_t38_info.reass_start_seqnum = -1;
 324                 p_conv_data->src_t38_info.reass_data_type = 0;
 325                 p_conv_data->src_t38_info.last_seqnum = -1;
 326                 p_conv_data->src_t38_info.packet_lost = 0;
 327                 p_conv_data->src_t38_info.burst_lost = 0;
 328                 p_conv_data->src_t38_info.time_first_t4_data = 0;
 329
 330
 331                 p_conv_data->dst_t38_info.reass_ID = 0;
 332                 p_conv_data->dst_t38_info.reass_start_seqnum = -1;
 333                 p_conv_data->dst_t38_info.reass_data_type = 0;
 334                 p_conv_data->dst_t38_info.last_seqnum = -1;
 335                 p_conv_data->dst_t38_info.packet_lost = 0;
 336                 p_conv_data->dst_t38_info.burst_lost = 0;
 337                 p_conv_data->dst_t38_info.time_first_t4_data = 0;
 338 }
 339
 340
 341 fragment_data *
 342 force_reassemble_seq(packet_info *pinfo, guint32 id,
 343              GHashTable *fragment_table)
 344 {
 345         fragment_key key;
 346         fragment_data *fd_head;
 347         fragment_data *fd_i;
 348         fragment_data *last_fd;
 349         guint32 dfpos, size, packet_lost, burst_lost, seq_num;
 350
 351         /* create key to search hash with */
 352         key.src = pinfo->src;
 353         key.dst = pinfo->dst;
 354         key.id  = id;
 355
 356         fd_head = g_hash_table_lookup(fragment_table, &key);
 357
 358         /* have we already seen this frame ?*/
 359         if (pinfo->fd->flags.visited) {
 360                 if (fd_head != NULL && fd_head->flags & FD_DEFRAGMENTED) {
 361                         return fd_head;
 362                 } else {
 363                         return NULL;
 364                 }
 365         }
 366
 367         if (fd_head==NULL){
 368                 /* we must have it to continue */
 369                 return NULL;
 370         }
 371
 372         /* check for packet lost and count the burst of packet lost */
 373         packet_lost = 0;
 374         burst_lost = 0;
 375         seq_num = 0;
 376         for(fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
 377                 if (seq_num != fd_i->offset) {
 378                         packet_lost += fd_i->offset - seq_num;
 379                         if ( (fd_i->offset - seq_num) > burst_lost ) {
 380                                 burst_lost = fd_i->offset - seq_num;
 381                         }
 382                 }
 383                 seq_num = fd_i->offset + 1;
 384         }
 385
 386         /* we have received an entire packet, defragment it and
 387      * free all fragments
 388      */
 389         size=0;
 390         last_fd=NULL;
 391         for(fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
 392           if(!last_fd || last_fd->offset!=fd_i->offset){
 393             size+=fd_i->len;
 394           }
 395           last_fd=fd_i;
 396         }
 397         fd_head->data = g_malloc(size);
 398         fd_head->len = size;            /* record size for caller       */
 399
 400         /* add all data fragments */
 401         dfpos = 0;
 402         last_fd=NULL;
 403         for (fd_i=fd_head->next;fd_i && fd_i->len + dfpos <= size;fd_i=fd_i->next) {
 404           if (fd_i->len) {
 405             if(!last_fd || last_fd->offset!=fd_i->offset){
 406               memcpy(fd_head->data+dfpos,fd_i->data,fd_i->len);
 407               dfpos += fd_i->len;
 408             } else {
 409               /* duplicate/retransmission/overlap */
 410               fd_i->flags    |= FD_OVERLAP;
 411               fd_head->flags |= FD_OVERLAP;
 412               if( (last_fd->len!=fd_i->datalen)
 413                   || memcmp(last_fd->data, fd_i->data, last_fd->len) ){
 414                         fd_i->flags    |= FD_OVERLAPCONFLICT;
 415                         fd_head->flags |= FD_OVERLAPCONFLICT;
 416               }
 417             }
 418           }
 419           last_fd=fd_i;
 420         }
 421
 422         /* we have defragmented the pdu, now free all fragments*/
 423         for (fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
 424           if(fd_i->data){
 425             g_free(fd_i->data);
 426             fd_i->data=NULL;
 427           }
 428         }
 429
 430         /* mark this packet as defragmented */
 431         fd_head->flags |= FD_DEFRAGMENTED;
 432         fd_head->reassembled_in=pinfo->fd->num;
 433
 434         if (check_col(pinfo->cinfo, COL_INFO))
 435                         col_append_fstr(pinfo->cinfo, COL_INFO, " (t4-data Reassembled: %d pack lost, %d pack burst lost)", packet_lost, burst_lost);
 436
 437         p_t38_packet_conv_info->packet_lost = packet_lost;
 438         p_t38_packet_conv_info->burst_lost = burst_lost;
 439
 440         return fd_head;
 441 }
 442
 443 /* T38 Routines */
 444
 445 /*--- Included file: packet-t38-fn.c ---*/
 446 #line 1 "packet-t38-fn.c"
 447
 448 const value_string t38_T30_indicator_vals[] = {
 449   {   0, "no-signal" },
 450   {   1, "cng" },
 451   {   2, "ced" },
 452   {   3, "v21-preamble" },
 453   {   4, "v27-2400-training" },
 454   {   5, "v27-4800-training" },
 455   {   6, "v29-7200-training" },
 456   {   7, "v29-9600-training" },
 457   {   8, "v17-7200-short-training" },
 458   {   9, "v17-7200-long-training" },
 459   {  10, "v17-9600-short-training" },
 460   {  11, "v17-9600-long-training" },
 461   {  12, "v17-12000-short-training" },
 462   {  13, "v17-12000-long-training" },
 463   {  14, "v17-14400-short-training" },
 464   {  15, "v17-14400-long-training" },
 465   {  16, "v8-ansam" },
 466   {  17, "v8-signal" },
 467   {  18, "v34-cntl-channel-1200" },
 468   {  19, "v34-pri-channel" },
 469   {  20, "v34-CC-retrain" },
 470   {  21, "v33-12000-training" },
 471   {  22, "v33-14400-training" },
 472   { 0, NULL }
 473 };
 474
 475
 476 static int
 477 dissect_t38_T30_indicator(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 478   offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
 479                                      16, &T30ind_value, TRUE, 7, NULL);
 480
 481 #line 31 "t38.cnf"
 482     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 483         col_append_fstr(actx->pinfo->cinfo, COL_INFO, " t30ind: %s",
 484          val_to_str(T30ind_value,t38_T30_indicator_vals,"<unknown>"));
 485     }
 486
 487     /* info for tap */
 488     if (primary_part)
 489         t38_info->t30ind_value = T30ind_value;
 490
 491   return offset;
 492 }
 493
 494
 495 const value_string t38_T30_data_vals[] = {
 496   {   0, "v21" },
 497   {   1, "v27-2400" },
 498   {   2, "v27-4800" },
 499   {   3, "v29-7200" },
 500   {   4, "v29-9600" },
 501   {   5, "v17-7200" },
 502   {   6, "v17-9600" },
 503   {   7, "v17-12000" },
 504   {   8, "v17-14400" },
 505   {   9, "v8" },
 506   {  10, "v34-pri-rate" },
 507   {  11, "v34-CC-1200" },
 508   {  12, "v34-pri-ch" },
 509   {  13, "v33-12000" },
 510   {  14, "v33-14400" },
 511   { 0, NULL }
 512 };
 513
 514
 515 static int
 516 dissect_t38_T30_data(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 517   offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
 518                                      9, &Data_value, TRUE, 6, NULL);
 519
 520 #line 43 "t38.cnf"
 521     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 522         col_append_fstr(actx->pinfo->cinfo, COL_INFO, " data:%s:",
 523          val_to_str(Data_value,t38_T30_data_vals,"<unknown>"));
 524     }
 525
 526
 527     /* info for tap */
 528     if (primary_part)
 529         t38_info->data_value = Data_value;
 530
 531   return offset;
 532 }
 533
 534
 535 static const value_string t38_Type_of_msg_vals[] = {
 536   {   0, "t30-indicator" },
 537   {   1, "t30-data" },
 538   { 0, NULL }
 539 };
 540
 541 static const per_choice_t Type_of_msg_choice[] = {
 542   {   0, &hf_t38_t30_indicator   , ASN1_NO_EXTENSIONS     , dissect_t38_T30_indicator },
 543   {   1, &hf_t38_t30_data        , ASN1_NO_EXTENSIONS     , dissect_t38_T30_data },
 544   { 0, NULL, 0, NULL }
 545 };
 546
 547 static int
 548 dissect_t38_Type_of_msg(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 549   offset = dissect_per_choice(tvb, offset, actx, tree, hf_index,
 550                                  ett_t38_Type_of_msg, Type_of_msg_choice,
 551                                  &Type_of_msg_value);
 552
 553 #line 24 "t38.cnf"
 554   /* info for tap */
 555   if (primary_part)
 556     t38_info->type_msg = Type_of_msg_value;
 557
 558   return offset;
 559 }
 560
 561
 562 static const value_string t38_T_field_type_vals[] = {
 563   {   0, "hdlc-data" },
 564   {   1, "hdlc-sig-end" },
 565   {   2, "hdlc-fcs-OK" },
 566   {   3, "hdlc-fcs-BAD" },
 567   {   4, "hdlc-fcs-OK-sig-end" },
 568   {   5, "hdlc-fcs-BAD-sig-end" },
 569   {   6, "t4-non-ecm-data" },
 570   {   7, "t4-non-ecm-sig-end" },
 571   {   8, "cm-message" },
 572   {   9, "jm-message" },
 573   {  10, "ci-message" },
 574   {  11, "v34rate" },
 575   { 0, NULL }
 576 };
 577
 578
 579 static int
 580 dissect_t38_T_field_type(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 581   offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
 582                                      8, &Data_Field_field_type_value, (use_pre_corrigendum_asn1_specification)?FALSE:TRUE, (use_pre_corrigendum_asn1_specification)?0:4, NULL);
 583
 584 #line 63 "t38.cnf"
 585     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 586         col_append_fstr(actx->pinfo->cinfo, COL_INFO, " %s",
 587          val_to_str(Data_Field_field_type_value,t38_T_field_type_vals,"<unknown>"));
 588     }
 589
 590     /* We only reassmeble packets in the Primary part and in the first two Items.                       */
 591     /* There maybe be t38 packets with more than two Items, but reassemble those packets is not easy    */
 592     /* using the current ressaemble functions.                                                          */
 593     /* TODO: reassemble all the Items in one frame */
 594     if (primary_part && (Data_Field_item_num<2)) {
 595         if (Data_Field_field_type_value == 2 || Data_Field_field_type_value == 4 || Data_Field_field_type_value == 7) {/* hdlc-fcs-OK or hdlc-fcs-OK-sig-end or t4-non-ecm-sig-end*/
 596             fragment_data *frag_msg = NULL;
 597             tvbuff_t* new_tvb = NULL;
 598             gboolean save_fragmented = actx->pinfo->fragmented;
 599
 600             actx->pinfo->fragmented = TRUE;
 601
 602             /* if reass_start_seqnum=-1 it means we have received the end of the fragmente, without received any fragment data */
 603             if (p_t38_packet_conv_info->reass_start_seqnum != -1) {
 604                 frag_msg = fragment_add_seq(tvb, offset, actx->pinfo,
 605                     p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
 606                     data_fragment_table, /* list of message fragments */
 607                     seq_number + Data_Field_item_num - (guint32)p_t38_packet_conv_info->reass_start_seqnum,  /* fragment sequence number */
 608                     /*0,*/
 609                     0, /* fragment length */
 610                     FALSE); /* More fragments */
 611                 if ( Data_Field_field_type_value == 7 ) {
 612                     /* if there was packet lost or other errors during the defrag then frag_msg is NULL. This could also means
 613                      * there are out of order packets (e.g, got the tail frame t4-non-ecm-sig-end before the last fragment),
 614                      * but we will assume there was packet lost instead, which is more usual. So, we are going to reassemble the packet
 615                      * and get some stat, like packet lost and burst number of packet lost
 616                     */
 617                     if (!frag_msg) {
 618                         force_reassemble_seq(actx->pinfo,
 619                             p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
 620                             data_fragment_table /* list of message fragments */
 621                         );
 622                     } else {
 623                         if (check_col(actx->pinfo->cinfo, COL_INFO))
 624                             col_append_str(actx->pinfo->cinfo, COL_INFO, " (t4-data Reassembled: No packet lost)");
 625
 626                         g_snprintf(t38_info->desc_comment, MAX_T38_DESC, "No packet lost");
 627                     }
 628
 629
 630                     if (p_t38_packet_conv_info->packet_lost) {
 631                         g_snprintf(t38_info->desc_comment, MAX_T38_DESC, " Pack lost: %d, Pack burst lost: %d", p_t38_packet_conv_info->packet_lost, p_t38_packet_conv_info->burst_lost);
 632                     } else {
 633                         g_snprintf(t38_info->desc_comment, MAX_T38_DESC, "No packet lost");
 634                     }
 635
 636                     new_tvb = process_reassembled_data(tvb, offset, actx->pinfo,
 637                                 "Reassembled Message", frag_msg, &data_frag_items, NULL, tree);
 638
 639                     /* Now reset fragmentation information in pinfo */
 640                     actx->pinfo->fragmented = save_fragmented;
 641
 642                     t38_info->time_first_t4_data = p_t38_packet_conv_info->time_first_t4_data;
 643                     t38_info->frame_num_first_t4_data = p_t38_packet_conv_info->reass_ID; /* The reass_ID is the Frame number of the first t4 fragment */
 644
 645                 } else {
 646                     new_tvb = process_reassembled_data(tvb, offset, actx->pinfo,
 647                                 "Reassembled Message", frag_msg, &data_frag_items, NULL, tree);
 648
 649                     /* Now reset fragmentation information in pinfo */
 650                     actx->pinfo->fragmented = save_fragmented;
 651                     actx->pinfo->private_data = t38_info;
 652
 653                     if (new_tvb) call_dissector((t30_hdlc_handle) ? t30_hdlc_handle : data_handle, new_tvb, actx->pinfo, tree);
 654                 }
 655             } else {
 656                 if(tree){
 657                     proto_tree_add_text(tree, tvb, offset, tvb_reported_length_remaining(tvb, offset),
 658                         "[RECEIVED END OF FRAGMENT W/OUT ANY FRAGMENT DATA]");
 659                 }
 660                 if (check_col(actx->pinfo->cinfo, COL_INFO)){
 661                     col_append_str(actx->pinfo->cinfo, COL_INFO, " [Malformed?]");
 662                 }
 663                 actx->pinfo->fragmented = save_fragmented;
 664             }
 665         }
 666
 667         /* reset the reassemble ID and the start seq number if it is not HDLC data */
 668         if ( p_t38_conv && ( ((Data_Field_field_type_value >0) && (Data_Field_field_type_value <6)) || (Data_Field_field_type_value == 7) ) ){
 669             p_t38_conv_info->reass_ID = 0;
 670             p_t38_conv_info->reass_start_seqnum = -1;
 671         }
 672         t38_info->Data_Field_field_type_value = Data_Field_field_type_value;
 673     }
 674
 675   return offset;
 676 }
 677
 678
 679
 680 static int
 681 dissect_t38_T_field_data(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 682 #line 155 "t38.cnf"
 683     tvbuff_t *value_tvb = NULL;
 684     guint32 value_len;
 685
 686   offset = dissect_per_octet_string(tvb, offset, actx, tree, hf_index,
 687                                        1, 65535, FALSE, &value_tvb);
 688
 689     value_len = tvb_length(value_tvb);
 690
 691
 692
 693 #line 162 "t38.cnf"
 694     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 695         if(value_len < 8){
 696             col_append_fstr(actx->pinfo->cinfo, COL_INFO, "[%s]",
 697                tvb_bytes_to_str(value_tvb,0,value_len));
 698         }
 699         else {
 700             col_append_fstr(actx->pinfo->cinfo, COL_INFO, "[%s...]",
 701                tvb_bytes_to_str(value_tvb,0,7));
 702         }
 703     }
 704
 705     /* We only reassmeble packets in the Primary part and in the first two Items.                       */
 706     /* There maybe be t38 packets with more than two Items, but reassemble those packets is not easy    */
 707     /* using the current ressaemble functions.                                                          */
 708     /* TODO: reassemble all the Items in one frame */
 709     if (primary_part && (Data_Field_item_num<2)) {
 710         tvbuff_t* new_tvb = NULL;
 711         fragment_data *frag_msg = NULL;
 712
 713         /* HDLC Data or t4-non-ecm-data */
 714         if (Data_Field_field_type_value == 0 || Data_Field_field_type_value == 6) { /* 0=HDLC Data or 6=t4-non-ecm-data*/
 715             gboolean save_fragmented = actx->pinfo->fragmented;
 716
 717             actx->pinfo->fragmented = TRUE;
 718
 719             /* if we have not reassembled this packet and it is the first fragment, reset the reassemble ID and the start seq number*/
 720             if (p_t38_packet_conv && p_t38_conv && (p_t38_packet_conv_info->reass_ID == 0)) {
 721                 /* we use the first fragment's frame_number as fragment ID because the protocol doesn't provide it */
 722                     p_t38_conv_info->reass_ID = actx->pinfo->fd->num;
 723                     p_t38_conv_info->reass_start_seqnum = seq_number;
 724                     p_t38_conv_info->time_first_t4_data = nstime_to_sec(&actx->pinfo->fd->rel_ts);
 725                     p_t38_packet_conv_info->reass_ID = p_t38_conv_info->reass_ID;
 726                     p_t38_packet_conv_info->reass_start_seqnum = p_t38_conv_info->reass_start_seqnum;
 727                     p_t38_packet_conv_info->time_first_t4_data = p_t38_conv_info->time_first_t4_data;
 728             }
 729
 730             frag_msg = fragment_add_seq(value_tvb, 0, actx->pinfo,
 731                 p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
 732                 data_fragment_table, /* list of message fragments */
 733                 seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum, /* fragment sequence number */
 734                 value_len, /* fragment length */
 735                 TRUE); /* More fragments */
 736
 737             new_tvb = process_reassembled_data(tvb, offset, actx->pinfo,
 738                         "Reassembled Message", frag_msg, &data_frag_items, NULL, tree);
 739
 740             if (!frag_msg) { /* Not last packet of reassembled */
 741                 if (Data_Field_field_type_value == 0) {
 742                     if (check_col(actx->pinfo->cinfo, COL_INFO))
 743                         col_append_fstr(actx->pinfo->cinfo, COL_INFO," (HDLC fragment %u)", seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum);
 744                 } else {
 745                     if (check_col(actx->pinfo->cinfo, COL_INFO))
 746                         col_append_fstr(actx->pinfo->cinfo, COL_INFO," (t4-data fragment %u)", seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum);
 747                 }
 748             }
 749
 750             /* Now reset fragmentation information in pinfo */
 751             actx->pinfo->fragmented = save_fragmented;
 752         }
 753     }
 754
 755   return offset;
 756 }
 757
 758
 759 static const per_sequence_t Data_Field_item_sequence[] = {
 760   { &hf_t38_field_type      , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_field_type },
 761   { &hf_t38_field_data      , ASN1_NO_EXTENSIONS     , ASN1_OPTIONAL    , dissect_t38_T_field_data },
 762   { NULL, 0, 0, NULL }
 763 };
 764
 765 static int
 766 dissect_t38_Data_Field_item(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 767   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 768                                    ett_t38_Data_Field_item, Data_Field_item_sequence);
 769
 770 #line 55 "t38.cnf"
 771     if (primary_part) Data_Field_item_num++;
 772
 773   return offset;
 774 }
 775
 776
 777 static const per_sequence_t Data_Field_sequence_of[1] = {
 778   { &hf_t38_Data_Field_item , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_Data_Field_item },
 779 };
 780
 781 static int
 782 dissect_t38_Data_Field(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 783   offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
 784                                       ett_t38_Data_Field, Data_Field_sequence_of);
 785
 786   return offset;
 787 }
 788
 789
 790 static const per_sequence_t IFPPacket_sequence[] = {
 791   { &hf_t38_type_of_msg     , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_Type_of_msg },
 792   { &hf_t38_data_field      , ASN1_NO_EXTENSIONS     , ASN1_OPTIONAL    , dissect_t38_Data_Field },
 793   { NULL, 0, 0, NULL }
 794 };
 795
 796 static int
 797 dissect_t38_IFPPacket(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 798   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 799                                    ett_t38_IFPPacket, IFPPacket_sequence);
 800
 801   return offset;
 802 }
 803
 804
 805
 806 static int
 807 dissect_t38_T_seq_number(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 808   offset = dissect_per_constrained_integer(tvb, offset, actx, tree, hf_index,
 809                                                             0U, 65535U, &seq_number, FALSE);
 810
 811 #line 232 "t38.cnf"
 812     /* info for tap */
 813     if (primary_part)
 814         t38_info->seq_num = seq_number;
 815
 816       if (check_col(actx->pinfo->cinfo, COL_INFO)){
 817         col_append_fstr(actx->pinfo->cinfo, COL_INFO, "Seq=%05u ",seq_number);
 818     }
 819
 820   return offset;
 821 }
 822
 823
 824
 825 static int
 826 dissect_t38_T_primary_ifp_packet(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 827 #line 242 "t38.cnf"
 828     primary_part = TRUE;
 829
 830   offset = dissect_per_open_type(tvb, offset, actx, tree, hf_index, dissect_t38_IFPPacket);
 831
 832 #line 244 "t38.cnf"
 833     /* if is a valid t38 packet, add to tap */
 834     if (p_t38_packet_conv && (!actx->pinfo->in_error_pkt) && ((gint32) seq_number != p_t38_packet_conv_info->last_seqnum))
 835         tap_queue_packet(t38_tap, actx->pinfo, t38_info);
 836
 837     if (p_t38_conv) p_t38_conv_info->last_seqnum = (gint32) seq_number;
 838
 839   return offset;
 840 }
 841
 842
 843
 844 static int
 845 dissect_t38_OpenType_IFPPacket(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 846   offset = dissect_per_open_type(tvb, offset, actx, tree, hf_index, dissect_t38_IFPPacket);
 847
 848   return offset;
 849 }
 850
 851
 852 static const per_sequence_t T_secondary_ifp_packets_sequence_of[1] = {
 853   { &hf_t38_secondary_ifp_packets_item, ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_OpenType_IFPPacket },
 854 };
 855
 856 static int
 857 dissect_t38_T_secondary_ifp_packets(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 858   offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
 859                                       ett_t38_T_secondary_ifp_packets, T_secondary_ifp_packets_sequence_of);
 860
 861   return offset;
 862 }
 863
 864
 865
 866 static int
 867 dissect_t38_INTEGER(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 868   offset = dissect_per_integer(tvb, offset, actx, tree, hf_index, NULL);
 869
 870   return offset;
 871 }
 872
 873
 874
 875 static int
 876 dissect_t38_OCTET_STRING(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 877   offset = dissect_per_octet_string(tvb, offset, actx, tree, hf_index,
 878                                        NO_BOUND, NO_BOUND, FALSE, NULL);
 879
 880   return offset;
 881 }
 882
 883
 884 static const per_sequence_t T_fec_data_sequence_of[1] = {
 885   { &hf_t38_fec_data_item   , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_OCTET_STRING },
 886 };
 887
 888 static int
 889 dissect_t38_T_fec_data(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 890   offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
 891                                       ett_t38_T_fec_data, T_fec_data_sequence_of);
 892
 893   return offset;
 894 }
 895
 896
 897 static const per_sequence_t T_fec_info_sequence[] = {
 898   { &hf_t38_fec_npackets    , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_INTEGER },
 899   { &hf_t38_fec_data        , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_fec_data },
 900   { NULL, 0, 0, NULL }
 901 };
 902
 903 static int
 904 dissect_t38_T_fec_info(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 905   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 906                                    ett_t38_T_fec_info, T_fec_info_sequence);
 907
 908   return offset;
 909 }
 910
 911
 912 static const value_string t38_T_error_recovery_vals[] = {
 913   {   0, "secondary-ifp-packets" },
 914   {   1, "fec-info" },
 915   { 0, NULL }
 916 };
 917
 918 static const per_choice_t T_error_recovery_choice[] = {
 919   {   0, &hf_t38_secondary_ifp_packets, ASN1_NO_EXTENSIONS     , dissect_t38_T_secondary_ifp_packets },
 920   {   1, &hf_t38_fec_info        , ASN1_NO_EXTENSIONS     , dissect_t38_T_fec_info },
 921   { 0, NULL, 0, NULL }
 922 };
 923
 924 static int
 925 dissect_t38_T_error_recovery(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 926 #line 252 "t38.cnf"
 927     primary_part = FALSE;
 928
 929   offset = dissect_per_choice(tvb, offset, actx, tree, hf_index,
 930                                  ett_t38_T_error_recovery, T_error_recovery_choice,
 931                                  NULL);
 932
 933 #line 254 "t38.cnf"
 934     primary_part = TRUE;
 935
 936   return offset;
 937 }
 938
 939
 940 static const per_sequence_t UDPTLPacket_sequence[] = {
 941   { &hf_t38_seq_number      , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_seq_number },
 942   { &hf_t38_primary_ifp_packet, ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_primary_ifp_packet },
 943   { &hf_t38_error_recovery  , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_error_recovery },
 944   { NULL, 0, 0, NULL }
 945 };
 946
 947 static int
 948 dissect_t38_UDPTLPacket(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 949 #line 226 "t38.cnf"
 950     /* Initialize to something else than data type */
 951     Data_Field_field_type_value = 1;
 952
 953   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 954                                    ett_t38_UDPTLPacket, UDPTLPacket_sequence);
 955
 956   return offset;
 957 }
 958
 959 /*--- PDUs ---*/
 960
 961 static int dissect_IFPPacket_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_) {
 962   int offset = 0;
 963   asn1_ctx_t asn1_ctx;
 964   asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
 965   offset = dissect_t38_IFPPacket(tvb, offset, &asn1_ctx, tree, hf_t38_IFPPacket_PDU);
 966   offset += 7; offset >>= 3;
 967   return offset;
 968 }
 969 static int dissect_UDPTLPacket_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_) {
 970   int offset = 0;
 971   asn1_ctx_t asn1_ctx;
 972   asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
 973   offset = dissect_t38_UDPTLPacket(tvb, offset, &asn1_ctx, tree, hf_t38_UDPTLPacket_PDU);
 974   offset += 7; offset >>= 3;
 975   return offset;
 976 }
 977
 978
 979 /*--- End of included file: packet-t38-fn.c ---*/
 980 #line 400 "packet-t38-template.c"
 981
 982 /* initialize the tap t38_info and the conversation */
 983 static void
 984 init_t38_info_conv(packet_info *pinfo)
 985 {
 986         /* tap info */
 987         t38_info_current++;
 988         if (t38_info_current==MAX_T38_MESSAGES_IN_PACKET) {
 989                 t38_info_current=0;
 990         }
 991         t38_info = &t38_info_arr[t38_info_current];
 992
 993         t38_info->seq_num = 0;
 994         t38_info->type_msg = 0;
 995         t38_info->data_value = 0;
 996         t38_info->t30ind_value =0;
 997         t38_info->setup_frame_number = 0;
 998         t38_info->Data_Field_field_type_value = 0;
 999         t38_info->desc[0] = '\0';
1000         t38_info->desc_comment[0] = '\0';
1001         t38_info->time_first_t4_data = 0;
1002         t38_info->frame_num_first_t4_data = 0;
1003
1004
1005         /*
1006                 p_t38_packet_conv hold the conversation info in each of the packets.
1007                 p_t38_conv hold the conversation info used to reassemble the HDLC packets, and also the Setup info (e.g SDP)
1008                 If we already have p_t38_packet_conv in the packet, it means we already reassembled the HDLC packets, so we don't
1009                 need to use p_t38_conv
1010         */
1011         p_t38_packet_conv = NULL;
1012         p_t38_conv = NULL;
1013
1014         /* Use existing packet info if available */
1015          p_t38_packet_conv = p_get_proto_data(pinfo->fd, proto_t38);
1016
1017
1018         /* find the conversation used for Reassemble and Setup Info */
1019         p_conv = find_conversation(pinfo->fd->num, &pinfo->net_src, &pinfo->net_dst,
1020                                    pinfo->ptype,
1021                                    pinfo->srcport, pinfo->destport, NO_ADDR_B | NO_PORT_B);
1022
1023         /* create a conv if it doen't exist */
1024         if (!p_conv) {
1025                 p_conv = conversation_new(pinfo->fd->num, &pinfo->net_src, &pinfo->net_dst,
1026                               pinfo->ptype, pinfo->srcport, pinfo->destport, NO_ADDR_B | NO_PORT_B);
1027
1028                 /* Set dissector */
1029                 conversation_set_dissector(p_conv, t38_udp_handle);
1030         }
1031
1032         if (!p_t38_packet_conv) {
1033                 p_t38_conv = conversation_get_proto_data(p_conv, proto_t38);
1034
1035                 /* create the conversation if it doen't exist */
1036                 if (!p_t38_conv) {
1037                         p_t38_conv = se_alloc(sizeof(t38_conv));
1038                         p_t38_conv->setup_method[0] = '\0';
1039                         p_t38_conv->setup_frame_number = 0;
1040
1041                         p_t38_conv->src_t38_info.reass_ID = 0;
1042                         p_t38_conv->src_t38_info.reass_start_seqnum = -1;
1043                         p_t38_conv->src_t38_info.reass_data_type = 0;
1044                         p_t38_conv->src_t38_info.last_seqnum = -1;
1045                         p_t38_conv->src_t38_info.packet_lost = 0;
1046                         p_t38_conv->src_t38_info.burst_lost = 0;
1047                         p_t38_conv->src_t38_info.time_first_t4_data = 0;
1048
1049                         p_t38_conv->dst_t38_info.reass_ID = 0;
1050                         p_t38_conv->dst_t38_info.reass_start_seqnum = -1;
1051                         p_t38_conv->dst_t38_info.reass_data_type = 0;
1052                         p_t38_conv->dst_t38_info.last_seqnum = -1;
1053                         p_t38_conv->dst_t38_info.packet_lost = 0;
1054                         p_t38_conv->dst_t38_info.burst_lost = 0;
1055                         p_t38_conv->dst_t38_info.time_first_t4_data = 0;
1056
1057                         conversation_add_proto_data(p_conv, proto_t38, p_t38_conv);
1058                 }
1059
1060                 /* copy the t38 conversation info to the packet t38 conversation */
1061                 p_t38_packet_conv = se_alloc(sizeof(t38_conv));
1062                 strncpy(p_t38_packet_conv->setup_method, p_t38_conv->setup_method, MAX_T38_SETUP_METHOD_SIZE);
1063                 p_t38_packet_conv->setup_method[MAX_T38_SETUP_METHOD_SIZE] = '\0';
1064                 p_t38_packet_conv->setup_frame_number = p_t38_conv->setup_frame_number;
1065
1066                 memcpy(&(p_t38_packet_conv->src_t38_info), &(p_t38_conv->src_t38_info), sizeof(t38_conv_info));
1067                 memcpy(&(p_t38_packet_conv->dst_t38_info), &(p_t38_conv->dst_t38_info), sizeof(t38_conv_info));
1068
1069                 p_add_proto_data(pinfo->fd, proto_t38, p_t38_packet_conv);
1070         }
1071
1072         if (ADDRESSES_EQUAL(&p_conv->key_ptr->addr1, &pinfo->net_src)) {
1073                 p_t38_conv_info = &(p_t38_conv->src_t38_info);
1074                 p_t38_packet_conv_info = &(p_t38_packet_conv->src_t38_info);
1075         } else {
1076                 p_t38_conv_info = &(p_t38_conv->dst_t38_info);
1077                 p_t38_packet_conv_info = &(p_t38_packet_conv->dst_t38_info);
1078         }
1079
1080         /* update t38_info */
1081         t38_info->setup_frame_number = p_t38_packet_conv->setup_frame_number;
1082 }
1083
1084 /* Entry point for dissection */
1085 static void
1086 dissect_t38_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1087 {
1088         guint8 octet1;
1089         proto_item *it;
1090         proto_tree *tr;
1091         guint32 offset=0;
1092
1093         /*
1094          * XXX - heuristic to check for misidentified packets.
1095          */
1096         if (dissect_possible_rtpv2_packets_as_rtp){
1097                 octet1 = tvb_get_guint8(tvb, offset);
1098                 if (RTP_VERSION(octet1) == 2){
1099                         call_dissector(rtp_handle,tvb,pinfo,tree);
1100                         return;
1101                 }
1102         }
1103
1104         if (check_col(pinfo->cinfo, COL_PROTOCOL)){
1105                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.38");
1106         }
1107         if (check_col(pinfo->cinfo, COL_INFO)){
1108                 col_clear(pinfo->cinfo, COL_INFO);
1109         }
1110
1111         primary_part = TRUE;
1112
1113         /* This indicate the item number in the primary part of the T38 message, it is used for the reassemble of T30 packets */
1114         Data_Field_item_num = 0;
1115
1116         it=proto_tree_add_protocol_format(tree, proto_t38, tvb, 0, -1, "ITU-T Recommendation T.38");
1117         tr=proto_item_add_subtree(it, ett_t38);
1118
1119         /* init tap and conv info */
1120         init_t38_info_conv(pinfo);
1121
1122         /* Show Conversation setup info if exists*/
1123         if (global_t38_show_setup_info) {
1124                 show_setup_info(tvb, tr, p_t38_packet_conv);
1125         }
1126
1127         if (check_col(pinfo->cinfo, COL_INFO)){
1128                 col_append_str(pinfo->cinfo, COL_INFO, "UDP: UDPTLPacket ");
1129         }
1130
1131         offset = dissect_UDPTLPacket_PDU(tvb, pinfo, tr);
1132
1133         if (tvb_length_remaining(tvb,offset)>0){
1134                 if (tr){
1135                         proto_tree_add_text(tr, tvb, offset, tvb_reported_length_remaining(tvb, offset),
1136                                 "[MALFORMED PACKET or wrong preference settings]");
1137                 }
1138                 if (check_col(pinfo->cinfo, COL_INFO)){
1139                         col_append_str(pinfo->cinfo, COL_INFO, " [Malformed?]");
1140                 }
1141         }
1142 }
1143
1144 static void
1145 dissect_t38_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1146 {
1147         proto_item *it;
1148         proto_tree *tr;
1149         guint32 offset=0;
1150     tvbuff_t *next_tvb;
1151         guint16 ifp_packet_number=1;
1152
1153         if (check_col(pinfo->cinfo, COL_PROTOCOL)){
1154                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.38");
1155         }
1156         if (check_col(pinfo->cinfo, COL_INFO)){
1157                 col_clear(pinfo->cinfo, COL_INFO);
1158         }
1159
1160         primary_part = TRUE;
1161
1162         /* This indicate the item number in the primary part of the T38 message, it is used for the reassemble of T30 packets */
1163         Data_Field_item_num = 0;
1164
1165         it=proto_tree_add_protocol_format(tree, proto_t38, tvb, 0, -1, "ITU-T Recommendation T.38");
1166         tr=proto_item_add_subtree(it, ett_t38);
1167
1168         /* init tap and conv info */
1169         init_t38_info_conv(pinfo);
1170
1171         /* Show Conversation setup info if exists*/
1172         if (global_t38_show_setup_info) {
1173                 show_setup_info(tvb, tr, p_t38_packet_conv);
1174         }
1175
1176         if (check_col(pinfo->cinfo, COL_INFO)){
1177                 col_append_str(pinfo->cinfo, COL_INFO, "TCP: IFPPacket");
1178         }
1179
1180         while(tvb_length_remaining(tvb,offset)>0)
1181         {
1182                 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
1183                 offset += dissect_IFPPacket_PDU(next_tvb, pinfo, tr);
1184                 ifp_packet_number++;
1185
1186                 if(tvb_length_remaining(tvb,offset)>0){
1187                         if(t38_tpkt_usage == T38_TPKT_ALWAYS){
1188                                 if(tr){
1189                                         proto_tree_add_text(tr, tvb, offset, tvb_reported_length_remaining(tvb, offset),
1190                                                 "[MALFORMED PACKET or wrong preference settings]");
1191                                 }
1192                                 if (check_col(pinfo->cinfo, COL_INFO)){
1193                                         col_append_str(pinfo->cinfo, COL_INFO, " [Malformed?]");
1194                                 }
1195                                 break;
1196                         }
1197                         else {
1198                                 if (check_col(pinfo->cinfo, COL_INFO)){
1199                                         col_append_fstr(pinfo->cinfo, COL_INFO, " IFPPacket#%u",ifp_packet_number);
1200                                 }
1201                         }
1202                 }
1203         }
1204
1205 }
1206
1207 static void
1208 dissect_t38_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1209 {
1210         primary_part = TRUE;
1211
1212         if(t38_tpkt_usage == T38_TPKT_ALWAYS){
1213                 dissect_tpkt_encap(tvb,pinfo,tree,t38_tpkt_reassembly,t38_tcp_pdu_handle);
1214         }
1215         else if((t38_tpkt_usage == T38_TPKT_NEVER) || (is_tpkt(tvb,1) == -1)){
1216                 dissect_t38_tcp_pdu(tvb, pinfo, tree);
1217         }
1218         else {
1219                 dissect_tpkt_encap(tvb,pinfo,tree,t38_tpkt_reassembly,t38_tcp_pdu_handle);
1220         }
1221 }
1222
1223 static void
1224 dissect_t38(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1225 {
1226         if(pinfo->ipproto == IP_PROTO_TCP)
1227         {
1228                 dissect_t38_tcp(tvb, pinfo, tree);
1229         }
1230         else if(pinfo->ipproto == IP_PROTO_UDP)
1231         {
1232                 dissect_t38_udp(tvb, pinfo, tree);
1233         }
1234 }
1235
1236 /* Look for conversation info and display any setup info found */
1237 void
1238 show_setup_info(tvbuff_t *tvb, proto_tree *tree, t38_conv *p_t38_conv)
1239 {
1240         proto_tree *t38_setup_tree;
1241         proto_item *ti;
1242
1243         if (!p_t38_conv || p_t38_conv->setup_frame_number == 0) {
1244                 /* there is no Setup info */
1245                 return;
1246         }
1247
1248         ti =  proto_tree_add_string_format(tree, hf_t38_setup, tvb, 0, 0,
1249                       "",
1250                       "Stream setup by %s (frame %u)",
1251                       p_t38_conv->setup_method,
1252                       p_t38_conv->setup_frame_number);
1253     PROTO_ITEM_SET_GENERATED(ti);
1254     t38_setup_tree = proto_item_add_subtree(ti, ett_t38_setup);
1255     if (t38_setup_tree)
1256     {
1257                 /* Add details into subtree */
1258                 proto_item* item = proto_tree_add_uint(t38_setup_tree, hf_t38_setup_frame,
1259                                                                tvb, 0, 0, p_t38_conv->setup_frame_number);
1260                 PROTO_ITEM_SET_GENERATED(item);
1261                 item = proto_tree_add_string(t38_setup_tree, hf_t38_setup_method,
1262                                                      tvb, 0, 0, p_t38_conv->setup_method);
1263                 PROTO_ITEM_SET_GENERATED(item);
1264     }
1265 }
1266
1267
1268
1269 /* Wireshark Protocol Registration */
1270 void
1271 proto_register_t38(void)
1272 {
1273         static hf_register_info hf[] =
1274         {
1275
1276 /*--- Included file: packet-t38-hfarr.c ---*/
1277 #line 1 "packet-t38-hfarr.c"
1278     { &hf_t38_IFPPacket_PDU,
1279       { "IFPPacket", "t38.IFPPacket",
1280         FT_NONE, BASE_NONE, NULL, 0,
1281         "t38.IFPPacket", HFILL }},
1282     { &hf_t38_UDPTLPacket_PDU,
1283       { "UDPTLPacket", "t38.UDPTLPacket",
1284         FT_NONE, BASE_NONE, NULL, 0,
1285         "t38.UDPTLPacket", HFILL }},
1286     { &hf_t38_type_of_msg,
1287       { "type-of-msg", "t38.type_of_msg",
1288         FT_UINT32, BASE_DEC, VALS(t38_Type_of_msg_vals), 0,
1289         "t38.Type_of_msg", HFILL }},
1290     { &hf_t38_data_field,
1291       { "data-field", "t38.data_field",
1292         FT_UINT32, BASE_DEC, NULL, 0,
1293         "t38.Data_Field", HFILL }},
1294     { &hf_t38_t30_indicator,
1295       { "t30-indicator", "t38.t30_indicator",
1296         FT_UINT32, BASE_DEC, VALS(t38_T30_indicator_vals), 0,
1297         "t38.T30_indicator", HFILL }},
1298     { &hf_t38_t30_data,
1299       { "t30-data", "t38.t30_data",
1300         FT_UINT32, BASE_DEC, VALS(t38_T30_data_vals), 0,
1301         "t38.T30_data", HFILL }},
1302     { &hf_t38_Data_Field_item,
1303       { "Item", "t38.Data_Field_item",
1304         FT_NONE, BASE_NONE, NULL, 0,
1305         "t38.Data_Field_item", HFILL }},
1306     { &hf_t38_field_type,
1307       { "field-type", "t38.field_type",
1308         FT_UINT32, BASE_DEC, VALS(t38_T_field_type_vals), 0,
1309         "t38.T_field_type", HFILL }},
1310     { &hf_t38_field_data,
1311       { "field-data", "t38.field_data",
1312         FT_BYTES, BASE_HEX, NULL, 0,
1313         "t38.T_field_data", HFILL }},
1314     { &hf_t38_seq_number,
1315       { "seq-number", "t38.seq_number",
1316         FT_UINT32, BASE_DEC, NULL, 0,
1317         "t38.T_seq_number", HFILL }},
1318     { &hf_t38_primary_ifp_packet,
1319       { "primary-ifp-packet", "t38.primary_ifp_packet",
1320         FT_NONE, BASE_NONE, NULL, 0,
1321         "t38.T_primary_ifp_packet", HFILL }},
1322     { &hf_t38_error_recovery,
1323       { "error-recovery", "t38.error_recovery",
1324         FT_UINT32, BASE_DEC, VALS(t38_T_error_recovery_vals), 0,
1325         "t38.T_error_recovery", HFILL }},
1326     { &hf_t38_secondary_ifp_packets,
1327       { "secondary-ifp-packets", "t38.secondary_ifp_packets",
1328         FT_UINT32, BASE_DEC, NULL, 0,
1329         "t38.T_secondary_ifp_packets", HFILL }},
1330     { &hf_t38_secondary_ifp_packets_item,
1331       { "Item", "t38.secondary_ifp_packets_item",
1332         FT_NONE, BASE_NONE, NULL, 0,
1333         "t38.OpenType_IFPPacket", HFILL }},
1334     { &hf_t38_fec_info,
1335       { "fec-info", "t38.fec_info",
1336         FT_NONE, BASE_NONE, NULL, 0,
1337         "t38.T_fec_info", HFILL }},
1338     { &hf_t38_fec_npackets,
1339       { "fec-npackets", "t38.fec_npackets",
1340         FT_INT32, BASE_DEC, NULL, 0,
1341         "t38.INTEGER", HFILL }},
1342     { &hf_t38_fec_data,
1343       { "fec-data", "t38.fec_data",
1344         FT_UINT32, BASE_DEC, NULL, 0,
1345         "t38.T_fec_data", HFILL }},
1346     { &hf_t38_fec_data_item,
1347       { "Item", "t38.fec_data_item",
1348         FT_BYTES, BASE_HEX, NULL, 0,
1349         "t38.OCTET_STRING", HFILL }},
1350
1351 /*--- End of included file: packet-t38-hfarr.c ---*/
1352 #line 695 "packet-t38-template.c"
1353                 {   &hf_t38_setup,
1354                     { "Stream setup", "t38.setup", FT_STRING, BASE_NONE,
1355                     NULL, 0x0, "Stream setup, method and frame number", HFILL }},
1356                 {   &hf_t38_setup_frame,
1357             { "Stream frame", "t38.setup-frame", FT_FRAMENUM, BASE_NONE,
1358             NULL, 0x0, "Frame that set up this stream", HFILL }},
1359         {   &hf_t38_setup_method,
1360             { "Stream Method", "t38.setup-method", FT_STRING, BASE_NONE,
1361             NULL, 0x0, "Method used to set up this stream", HFILL }},
1362                 {&hf_data_fragments,
1363                         {"Message fragments", "data.fragments",
1364                         FT_NONE, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1365                 {&hf_data_fragment,
1366                         {"Message fragment", "data.fragment",
1367                         FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1368                 {&hf_data_fragment_overlap,
1369                         {"Message fragment overlap", "data.fragment.overlap",
1370                         FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1371                 {&hf_data_fragment_overlap_conflicts,
1372                         {"Message fragment overlapping with conflicting data",
1373                         "data.fragment.overlap.conflicts",
1374                         FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1375                 {&hf_data_fragment_multiple_tails,
1376                         {"Message has multiple tail fragments",
1377                         "data.fragment.multiple_tails",
1378                         FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1379                 {&hf_data_fragment_too_long_fragment,
1380                         {"Message fragment too long", "data.fragment.too_long_fragment",
1381                         FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1382                 {&hf_data_fragment_error,
1383                         {"Message defragmentation error", "data.fragment.error",
1384                         FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1385                 {&hf_data_reassembled_in,
1386                         {"Reassembled in", "data.reassembled.in",
1387                         FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1388         };
1389
1390         static gint *ett[] =
1391         {
1392                 &ett_t38,
1393
1394 /*--- Included file: packet-t38-ettarr.c ---*/
1395 #line 1 "packet-t38-ettarr.c"
1396     &ett_t38_IFPPacket,
1397     &ett_t38_Type_of_msg,
1398     &ett_t38_Data_Field,
1399     &ett_t38_Data_Field_item,
1400     &ett_t38_UDPTLPacket,
1401     &ett_t38_T_error_recovery,
1402     &ett_t38_T_secondary_ifp_packets,
1403     &ett_t38_T_fec_info,
1404     &ett_t38_T_fec_data,
1405
1406 /*--- End of included file: packet-t38-ettarr.c ---*/
1407 #line 736 "packet-t38-template.c"
1408                 &ett_t38_setup,
1409                 &ett_data_fragment,
1410                 &ett_data_fragments
1411         };
1412
1413         module_t *t38_module;
1414
1415         proto_t38 = proto_register_protocol("T.38", "T.38", "t38");
1416         proto_register_field_array(proto_t38, hf, array_length(hf));
1417         proto_register_subtree_array(ett, array_length(ett));
1418         register_dissector("t38", dissect_t38, proto_t38);
1419
1420         /* Init reassemble tables for HDLC */
1421     register_init_routine(t38_defragment_init);
1422
1423         t38_tap = register_tap("t38");
1424
1425         t38_module = prefs_register_protocol(proto_t38, proto_reg_handoff_t38);
1426         prefs_register_bool_preference(t38_module, "use_pre_corrigendum_asn1_specification",
1427             "Use the Pre-Corrigendum ASN.1 specification",
1428             "Whether the T.38 dissector should decode using the Pre-Corrigendum T.38 "
1429                 "ASN.1 specification (1998).",
1430             &use_pre_corrigendum_asn1_specification);
1431         prefs_register_bool_preference(t38_module, "dissect_possible_rtpv2_packets_as_rtp",
1432             "Dissect possible RTP version 2 packets with RTP dissector",
1433             "Whether a UDP packet that looks like RTP version 2 packet will "
1434                 "be dissected as RTP packet or T.38 packet. If enabled there is a risk that T.38 UDPTL "
1435                 "packets with sequence number higher than 32767 may be dissected as RTP.",
1436             &dissect_possible_rtpv2_packets_as_rtp);
1437         prefs_register_uint_preference(t38_module, "tcp.port",
1438                 "T.38 TCP Port",
1439                 "Set the TCP port for T.38 messages",
1440                 10, &global_t38_tcp_port);
1441         prefs_register_uint_preference(t38_module, "udp.port",
1442                 "T.38 UDP Port",
1443                 "Set the UDP port for T.38 messages",
1444                 10, &global_t38_udp_port);
1445         prefs_register_bool_preference(t38_module, "reassembly",
1446                 "Reassemble T.38 PDUs over TPKT over TCP",
1447                 "Whether the dissector should reassemble T.38 PDUs spanning multiple TCP segments "
1448                 "when TPKT is used over TCP. "
1449         "To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
1450                 &t38_tpkt_reassembly);
1451         prefs_register_enum_preference(t38_module, "tpkt_usage",
1452                 "TPKT used over TCP",
1453                 "Whether T.38 is used with TPKT for TCP",
1454                 (gint *)&t38_tpkt_usage,t38_tpkt_options,FALSE);
1455
1456         prefs_register_bool_preference(t38_module, "show_setup_info",
1457                 "Show stream setup information",
1458                 "Where available, show which protocol and frame caused "
1459                 "this T.38 stream to be created",
1460                 &global_t38_show_setup_info);
1461
1462 }
1463
1464 void
1465 proto_reg_handoff_t38(void)
1466 {
1467         static int t38_prefs_initialized = FALSE;
1468
1469         if (!t38_prefs_initialized) {
1470                 t38_udp_handle=create_dissector_handle(dissect_t38_udp, proto_t38);
1471                 t38_tcp_handle=create_dissector_handle(dissect_t38_tcp, proto_t38);
1472                 t38_tcp_pdu_handle=create_dissector_handle(dissect_t38_tcp_pdu, proto_t38);
1473                 t38_prefs_initialized = TRUE;
1474         }
1475         else {
1476                 dissector_delete("tcp.port", tcp_port, t38_tcp_handle);
1477                 dissector_delete("udp.port", udp_port, t38_udp_handle);
1478         }
1479         tcp_port = global_t38_tcp_port;
1480         udp_port = global_t38_udp_port;
1481
1482         dissector_add("tcp.port", tcp_port, t38_tcp_handle);
1483         dissector_add("udp.port", udp_port, t38_udp_handle);
1484
1485         rtp_handle = find_dissector("rtp");
1486         t30_hdlc_handle = find_dissector("t30.hdlc");
1487         data_handle = find_dissector("data");
1488 }
1489
1490
1491
1492