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 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                 printf("#%u: t38_add_address(%s, %u, %u, %s, %u\n", pinfo->fd->num, address_to_str(addr), port, other_port, setup_method, setup_frame_number);
 281
 282         SET_ADDRESS(&null_addr, AT_NONE, 0, NULL);
 283
 284         /*
 285          * Check if the ip address and port combination is not
 286          * already registered as a conversation.
 287          */
 288         p_conv = find_conversation( setup_frame_number, addr, &null_addr, PT_UDP, port, other_port,
 289                                 NO_ADDR_B | (!other_port ? NO_PORT_B : 0));
 290
 291         /*
 292          * If not, create a new conversation.
 293          */
 294         if ( !p_conv || p_conv->setup_frame != setup_frame_number) {
 295                 p_conv = conversation_new( setup_frame_number, addr, &null_addr, PT_UDP,
 296                                            (guint32)port, (guint32)other_port,
 297                                                                    NO_ADDR2 | (!other_port ? NO_PORT2 : 0));
 298         }
 299
 300         /* Set dissector */
 301         conversation_set_dissector(p_conv, t38_udp_handle);
 302
 303         /*
 304          * Check if the conversation has data associated with it.
 305          */
 306         p_conv_data = conversation_get_proto_data(p_conv, proto_t38);
 307
 308         /*
 309          * If not, add a new data item.
 310          */
 311         if ( ! p_conv_data ) {
 312                 /* Create conversation data */
 313                 p_conv_data = se_alloc(sizeof(t38_conv));
 314
 315                 conversation_add_proto_data(p_conv, proto_t38, p_conv_data);
 316         }
 317
 318         /*
 319          * Update the conversation data.
 320          */
 321         strncpy(p_conv_data->setup_method, setup_method, MAX_T38_SETUP_METHOD_SIZE);
 322         p_conv_data->setup_method[MAX_T38_SETUP_METHOD_SIZE] = '\0';
 323         p_conv_data->setup_frame_number = setup_frame_number;
 324                 p_conv_data->src_t38_info.reass_ID = 0;
 325                 p_conv_data->src_t38_info.reass_start_seqnum = -1;
 326                 p_conv_data->src_t38_info.reass_data_type = 0;
 327                 p_conv_data->src_t38_info.last_seqnum = -1;
 328                 p_conv_data->src_t38_info.packet_lost = 0;
 329                 p_conv_data->src_t38_info.burst_lost = 0;
 330                 p_conv_data->src_t38_info.time_first_t4_data = 0;
 331
 332
 333                 p_conv_data->dst_t38_info.reass_ID = 0;
 334                 p_conv_data->dst_t38_info.reass_start_seqnum = -1;
 335                 p_conv_data->dst_t38_info.reass_data_type = 0;
 336                 p_conv_data->dst_t38_info.last_seqnum = -1;
 337                 p_conv_data->dst_t38_info.packet_lost = 0;
 338                 p_conv_data->dst_t38_info.burst_lost = 0;
 339                 p_conv_data->dst_t38_info.time_first_t4_data = 0;
 340 }
 341
 342
 343 fragment_data *
 344 force_reassemble_seq(packet_info *pinfo, guint32 id,
 345              GHashTable *fragment_table)
 346 {
 347         fragment_key key;
 348         fragment_data *fd_head;
 349         fragment_data *fd_i;
 350         fragment_data *last_fd;
 351         guint32 dfpos, size, packet_lost, burst_lost, seq_num;
 352
 353         /* create key to search hash with */
 354         key.src = pinfo->src;
 355         key.dst = pinfo->dst;
 356         key.id  = id;
 357
 358         fd_head = g_hash_table_lookup(fragment_table, &key);
 359
 360         /* have we already seen this frame ?*/
 361         if (pinfo->fd->flags.visited) {
 362                 if (fd_head != NULL && fd_head->flags & FD_DEFRAGMENTED) {
 363                         return fd_head;
 364                 } else {
 365                         return NULL;
 366                 }
 367         }
 368
 369         if (fd_head==NULL){
 370                 /* we must have it to continue */
 371                 return NULL;
 372         }
 373
 374         /* check for packet lost and count the burst of packet lost */
 375         packet_lost = 0;
 376         burst_lost = 0;
 377         seq_num = 0;
 378         for(fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
 379                 if (seq_num != fd_i->offset) {
 380                         packet_lost += fd_i->offset - seq_num;
 381                         if ( (fd_i->offset - seq_num) > burst_lost ) {
 382                                 burst_lost = fd_i->offset - seq_num;
 383                         }
 384                 }
 385                 seq_num = fd_i->offset + 1;
 386         }
 387
 388         /* we have received an entire packet, defragment it and
 389      * free all fragments
 390      */
 391         size=0;
 392         last_fd=NULL;
 393         for(fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
 394           if(!last_fd || last_fd->offset!=fd_i->offset){
 395             size+=fd_i->len;
 396           }
 397           last_fd=fd_i;
 398         }
 399         fd_head->data = g_malloc(size);
 400         fd_head->len = size;            /* record size for caller       */
 401
 402         /* add all data fragments */
 403         dfpos = 0;
 404         last_fd=NULL;
 405         for (fd_i=fd_head->next;fd_i && fd_i->len + dfpos <= size;fd_i=fd_i->next) {
 406           if (fd_i->len) {
 407             if(!last_fd || last_fd->offset!=fd_i->offset){
 408               memcpy(fd_head->data+dfpos,fd_i->data,fd_i->len);
 409               dfpos += fd_i->len;
 410             } else {
 411               /* duplicate/retransmission/overlap */
 412               fd_i->flags    |= FD_OVERLAP;
 413               fd_head->flags |= FD_OVERLAP;
 414               if( (last_fd->len!=fd_i->datalen)
 415                   || memcmp(last_fd->data, fd_i->data, last_fd->len) ){
 416                         fd_i->flags    |= FD_OVERLAPCONFLICT;
 417                         fd_head->flags |= FD_OVERLAPCONFLICT;
 418               }
 419             }
 420           }
 421           last_fd=fd_i;
 422         }
 423
 424         /* we have defragmented the pdu, now free all fragments*/
 425         for (fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
 426           if(fd_i->data){
 427             g_free(fd_i->data);
 428             fd_i->data=NULL;
 429           }
 430         }
 431
 432         /* mark this packet as defragmented */
 433         fd_head->flags |= FD_DEFRAGMENTED;
 434         fd_head->reassembled_in=pinfo->fd->num;
 435
 436         if (check_col(pinfo->cinfo, COL_INFO))
 437                         col_append_fstr(pinfo->cinfo, COL_INFO, " (t4-data Reassembled: %d pack lost, %d pack burst lost)", packet_lost, burst_lost);
 438
 439         p_t38_packet_conv_info->packet_lost = packet_lost;
 440         p_t38_packet_conv_info->burst_lost = burst_lost;
 441
 442         return fd_head;
 443 }
 444
 445 /* T38 Routines */
 446
 447 /*--- Included file: packet-t38-fn.c ---*/
 448 #line 1 "packet-t38-fn.c"
 449
 450 const value_string t38_T30_indicator_vals[] = {
 451   {   0, "no-signal" },
 452   {   1, "cng" },
 453   {   2, "ced" },
 454   {   3, "v21-preamble" },
 455   {   4, "v27-2400-training" },
 456   {   5, "v27-4800-training" },
 457   {   6, "v29-7200-training" },
 458   {   7, "v29-9600-training" },
 459   {   8, "v17-7200-short-training" },
 460   {   9, "v17-7200-long-training" },
 461   {  10, "v17-9600-short-training" },
 462   {  11, "v17-9600-long-training" },
 463   {  12, "v17-12000-short-training" },
 464   {  13, "v17-12000-long-training" },
 465   {  14, "v17-14400-short-training" },
 466   {  15, "v17-14400-long-training" },
 467   {  16, "v8-ansam" },
 468   {  17, "v8-signal" },
 469   {  18, "v34-cntl-channel-1200" },
 470   {  19, "v34-pri-channel" },
 471   {  20, "v34-CC-retrain" },
 472   {  21, "v33-12000-training" },
 473   {  22, "v33-14400-training" },
 474   { 0, NULL }
 475 };
 476
 477
 478 static int
 479 dissect_t38_T30_indicator(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 480   offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
 481                                      16, &T30ind_value, TRUE, 7, NULL);
 482
 483 #line 31 "t38.cnf"
 484     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 485         col_append_fstr(actx->pinfo->cinfo, COL_INFO, " t30ind: %s",
 486          val_to_str(T30ind_value,t38_T30_indicator_vals,"<unknown>"));
 487     }
 488
 489     /* info for tap */
 490     if (primary_part)
 491         t38_info->t30ind_value = T30ind_value;
 492
 493   return offset;
 494 }
 495
 496
 497 const value_string t38_T30_data_vals[] = {
 498   {   0, "v21" },
 499   {   1, "v27-2400" },
 500   {   2, "v27-4800" },
 501   {   3, "v29-7200" },
 502   {   4, "v29-9600" },
 503   {   5, "v17-7200" },
 504   {   6, "v17-9600" },
 505   {   7, "v17-12000" },
 506   {   8, "v17-14400" },
 507   {   9, "v8" },
 508   {  10, "v34-pri-rate" },
 509   {  11, "v34-CC-1200" },
 510   {  12, "v34-pri-ch" },
 511   {  13, "v33-12000" },
 512   {  14, "v33-14400" },
 513   { 0, NULL }
 514 };
 515
 516
 517 static int
 518 dissect_t38_T30_data(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 519   offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
 520                                      9, &Data_value, TRUE, 6, NULL);
 521
 522 #line 43 "t38.cnf"
 523     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 524         col_append_fstr(actx->pinfo->cinfo, COL_INFO, " data:%s:",
 525          val_to_str(Data_value,t38_T30_data_vals,"<unknown>"));
 526     }
 527
 528
 529     /* info for tap */
 530     if (primary_part)
 531         t38_info->data_value = Data_value;
 532
 533   return offset;
 534 }
 535
 536
 537 static const value_string t38_Type_of_msg_vals[] = {
 538   {   0, "t30-indicator" },
 539   {   1, "t30-data" },
 540   { 0, NULL }
 541 };
 542
 543 static const per_choice_t Type_of_msg_choice[] = {
 544   {   0, &hf_t38_t30_indicator   , ASN1_NO_EXTENSIONS     , dissect_t38_T30_indicator },
 545   {   1, &hf_t38_t30_data        , ASN1_NO_EXTENSIONS     , dissect_t38_T30_data },
 546   { 0, NULL, 0, NULL }
 547 };
 548
 549 static int
 550 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_) {
 551   offset = dissect_per_choice(tvb, offset, actx, tree, hf_index,
 552                                  ett_t38_Type_of_msg, Type_of_msg_choice,
 553                                  &Type_of_msg_value);
 554
 555 #line 24 "t38.cnf"
 556   /* info for tap */
 557   if (primary_part)
 558     t38_info->type_msg = Type_of_msg_value;
 559
 560   return offset;
 561 }
 562
 563
 564 static const value_string t38_T_field_type_vals[] = {
 565   {   0, "hdlc-data" },
 566   {   1, "hdlc-sig-end" },
 567   {   2, "hdlc-fcs-OK" },
 568   {   3, "hdlc-fcs-BAD" },
 569   {   4, "hdlc-fcs-OK-sig-end" },
 570   {   5, "hdlc-fcs-BAD-sig-end" },
 571   {   6, "t4-non-ecm-data" },
 572   {   7, "t4-non-ecm-sig-end" },
 573   {   8, "cm-message" },
 574   {   9, "jm-message" },
 575   {  10, "ci-message" },
 576   {  11, "v34rate" },
 577   { 0, NULL }
 578 };
 579
 580
 581 static int
 582 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_) {
 583   offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
 584                                      8, &Data_Field_field_type_value, (use_pre_corrigendum_asn1_specification)?FALSE:TRUE, (use_pre_corrigendum_asn1_specification)?0:4, NULL);
 585
 586 #line 63 "t38.cnf"
 587     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 588         col_append_fstr(actx->pinfo->cinfo, COL_INFO, " %s",
 589          val_to_str(Data_Field_field_type_value,t38_T_field_type_vals,"<unknown>"));
 590     }
 591
 592     /* We only reassmeble packets in the Primary part and in the first two Items.                       */
 593     /* There maybe be t38 packets with more than two Items, but reassemble those packets is not easy    */
 594     /* using the current ressaemble functions.                                                          */
 595     /* TODO: reassemble all the Items in one frame */
 596     if (primary_part && (Data_Field_item_num<2)) {
 597         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*/
 598             fragment_data *frag_msg = NULL;
 599             tvbuff_t* new_tvb = NULL;
 600             gboolean save_fragmented = actx->pinfo->fragmented;
 601
 602             actx->pinfo->fragmented = TRUE;
 603
 604             /* if reass_start_seqnum=-1 it means we have received the end of the fragmente, without received any fragment data */
 605             if (p_t38_packet_conv_info->reass_start_seqnum != -1) {
 606                 frag_msg = fragment_add_seq(tvb, offset, actx->pinfo,
 607                     p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
 608                     data_fragment_table, /* list of message fragments */
 609                     seq_number + Data_Field_item_num - (guint32)p_t38_packet_conv_info->reass_start_seqnum,  /* fragment sequence number */
 610                     /*0,*/
 611                     0, /* fragment length */
 612                     FALSE); /* More fragments */
 613                 if ( Data_Field_field_type_value == 7 ) {
 614                     /* if there was packet lost or other errors during the defrag then frag_msg is NULL. This could also means
 615                      * there are out of order packets (e.g, got the tail frame t4-non-ecm-sig-end before the last fragment),
 616                      * but we will assume there was packet lost instead, which is more usual. So, we are going to reassemble the packet
 617                      * and get some stat, like packet lost and burst number of packet lost
 618                     */
 619                     if (!frag_msg) {
 620                         force_reassemble_seq(actx->pinfo,
 621                             p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
 622                             data_fragment_table /* list of message fragments */
 623                         );
 624                     } else {
 625                         if (check_col(actx->pinfo->cinfo, COL_INFO))
 626                             col_append_str(actx->pinfo->cinfo, COL_INFO, " (t4-data Reassembled: No packet lost)");
 627
 628                         g_snprintf(t38_info->desc_comment, MAX_T38_DESC, "No packet lost");
 629                     }
 630
 631
 632                     if (p_t38_packet_conv_info->packet_lost) {
 633                         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);
 634                     } else {
 635                         g_snprintf(t38_info->desc_comment, MAX_T38_DESC, "No packet lost");
 636                     }
 637
 638                     new_tvb = process_reassembled_data(tvb, offset, actx->pinfo,
 639                                 "Reassembled Message", frag_msg, &data_frag_items, NULL, tree);
 640
 641                     /* Now reset fragmentation information in pinfo */
 642                     actx->pinfo->fragmented = save_fragmented;
 643
 644                     t38_info->time_first_t4_data = p_t38_packet_conv_info->time_first_t4_data;
 645                     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 */
 646
 647                 } else {
 648                     new_tvb = process_reassembled_data(tvb, offset, actx->pinfo,
 649                                 "Reassembled Message", frag_msg, &data_frag_items, NULL, tree);
 650
 651                     /* Now reset fragmentation information in pinfo */
 652                     actx->pinfo->fragmented = save_fragmented;
 653                     actx->pinfo->private_data = t38_info;
 654
 655                     if (new_tvb) call_dissector((t30_hdlc_handle) ? t30_hdlc_handle : data_handle, new_tvb, actx->pinfo, tree);
 656                 }
 657             } else {
 658                 if(tree){
 659                     proto_tree_add_text(tree, tvb, offset, tvb_reported_length_remaining(tvb, offset),
 660                         "[RECEIVED END OF FRAGMENT W/OUT ANY FRAGMENT DATA]");
 661                 }
 662                 if (check_col(actx->pinfo->cinfo, COL_INFO)){
 663                     col_append_str(actx->pinfo->cinfo, COL_INFO, " [Malformed?]");
 664                 }
 665                 actx->pinfo->fragmented = save_fragmented;
 666             }
 667         }
 668
 669         /* reset the reassemble ID and the start seq number if it is not HDLC data */
 670         if ( p_t38_conv && ( ((Data_Field_field_type_value >0) && (Data_Field_field_type_value <6)) || (Data_Field_field_type_value == 7) ) ){
 671             p_t38_conv_info->reass_ID = 0;
 672             p_t38_conv_info->reass_start_seqnum = -1;
 673         }
 674         t38_info->Data_Field_field_type_value = Data_Field_field_type_value;
 675     }
 676
 677   return offset;
 678 }
 679
 680
 681
 682 static int
 683 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_) {
 684 #line 155 "t38.cnf"
 685     tvbuff_t *value_tvb = NULL;
 686     guint32 value_len;
 687
 688   offset = dissect_per_octet_string(tvb, offset, actx, tree, hf_index,
 689                                        1, 65535, FALSE, &value_tvb);
 690
 691     value_len = tvb_length(value_tvb);
 692
 693
 694
 695 #line 162 "t38.cnf"
 696     if (check_col(actx->pinfo->cinfo, COL_INFO) && primary_part){
 697         if(value_len < 8){
 698             col_append_fstr(actx->pinfo->cinfo, COL_INFO, "[%s]",
 699                tvb_bytes_to_str(value_tvb,0,value_len));
 700         }
 701         else {
 702             col_append_fstr(actx->pinfo->cinfo, COL_INFO, "[%s...]",
 703                tvb_bytes_to_str(value_tvb,0,7));
 704         }
 705     }
 706
 707     /* We only reassmeble packets in the Primary part and in the first two Items.                       */
 708     /* There maybe be t38 packets with more than two Items, but reassemble those packets is not easy    */
 709     /* using the current ressaemble functions.                                                          */
 710     /* TODO: reassemble all the Items in one frame */
 711     if (primary_part && (Data_Field_item_num<2)) {
 712         tvbuff_t* new_tvb = NULL;
 713         fragment_data *frag_msg = NULL;
 714
 715         /* HDLC Data or t4-non-ecm-data */
 716         if (Data_Field_field_type_value == 0 || Data_Field_field_type_value == 6) { /* 0=HDLC Data or 6=t4-non-ecm-data*/
 717             gboolean save_fragmented = actx->pinfo->fragmented;
 718
 719             actx->pinfo->fragmented = TRUE;
 720
 721             /* if we have not reassembled this packet and it is the first fragment, reset the reassemble ID and the start seq number*/
 722             if (p_t38_packet_conv && p_t38_conv && (p_t38_packet_conv_info->reass_ID == 0)) {
 723                 /* we use the first fragment's frame_number as fragment ID because the protocol doesn't provide it */
 724                     p_t38_conv_info->reass_ID = actx->pinfo->fd->num;
 725                     p_t38_conv_info->reass_start_seqnum = seq_number;
 726                     p_t38_conv_info->time_first_t4_data = nstime_to_sec(&actx->pinfo->fd->rel_ts);
 727                     p_t38_packet_conv_info->reass_ID = p_t38_conv_info->reass_ID;
 728                     p_t38_packet_conv_info->reass_start_seqnum = p_t38_conv_info->reass_start_seqnum;
 729                     p_t38_packet_conv_info->time_first_t4_data = p_t38_conv_info->time_first_t4_data;
 730             }
 731
 732             frag_msg = fragment_add_seq(value_tvb, 0, actx->pinfo,
 733                 p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
 734                 data_fragment_table, /* list of message fragments */
 735                 seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum, /* fragment sequence number */
 736                 value_len, /* fragment length */
 737                 TRUE); /* More fragments */
 738
 739             new_tvb = process_reassembled_data(tvb, offset, actx->pinfo,
 740                         "Reassembled Message", frag_msg, &data_frag_items, NULL, tree);
 741
 742             if (!frag_msg) { /* Not last packet of reassembled */
 743                 if (Data_Field_field_type_value == 0) {
 744                     if (check_col(actx->pinfo->cinfo, COL_INFO))
 745                         col_append_fstr(actx->pinfo->cinfo, COL_INFO," (HDLC fragment %u)", seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum);
 746                 } else {
 747                     if (check_col(actx->pinfo->cinfo, COL_INFO))
 748                         col_append_fstr(actx->pinfo->cinfo, COL_INFO," (t4-data fragment %u)", seq_number - (guint32)p_t38_packet_conv_info->reass_start_seqnum);
 749                 }
 750             }
 751
 752             /* Now reset fragmentation information in pinfo */
 753             actx->pinfo->fragmented = save_fragmented;
 754         }
 755     }
 756
 757   return offset;
 758 }
 759
 760
 761 static const per_sequence_t Data_Field_item_sequence[] = {
 762   { &hf_t38_field_type      , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_field_type },
 763   { &hf_t38_field_data      , ASN1_NO_EXTENSIONS     , ASN1_OPTIONAL    , dissect_t38_T_field_data },
 764   { NULL, 0, 0, NULL }
 765 };
 766
 767 static int
 768 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_) {
 769   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 770                                    ett_t38_Data_Field_item, Data_Field_item_sequence);
 771
 772 #line 55 "t38.cnf"
 773     if (primary_part) Data_Field_item_num++;
 774
 775   return offset;
 776 }
 777
 778
 779 static const per_sequence_t Data_Field_sequence_of[1] = {
 780   { &hf_t38_Data_Field_item , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_Data_Field_item },
 781 };
 782
 783 static int
 784 dissect_t38_Data_Field(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 785   offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
 786                                       ett_t38_Data_Field, Data_Field_sequence_of);
 787
 788   return offset;
 789 }
 790
 791
 792 static const per_sequence_t IFPPacket_sequence[] = {
 793   { &hf_t38_type_of_msg     , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_Type_of_msg },
 794   { &hf_t38_data_field      , ASN1_NO_EXTENSIONS     , ASN1_OPTIONAL    , dissect_t38_Data_Field },
 795   { NULL, 0, 0, NULL }
 796 };
 797
 798 static int
 799 dissect_t38_IFPPacket(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 800   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 801                                    ett_t38_IFPPacket, IFPPacket_sequence);
 802
 803   return offset;
 804 }
 805
 806
 807
 808 static int
 809 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_) {
 810   offset = dissect_per_constrained_integer(tvb, offset, actx, tree, hf_index,
 811                                               0U, 65535U, &seq_number, FALSE);
 812
 813 #line 232 "t38.cnf"
 814     /* info for tap */
 815     if (primary_part)
 816         t38_info->seq_num = seq_number;
 817
 818       if (check_col(actx->pinfo->cinfo, COL_INFO)){
 819         col_append_fstr(actx->pinfo->cinfo, COL_INFO, "Seq=%05u ",seq_number);
 820     }
 821
 822   return offset;
 823 }
 824
 825
 826
 827 static int
 828 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_) {
 829 #line 242 "t38.cnf"
 830     primary_part = TRUE;
 831
 832   offset = dissect_per_open_type(tvb, offset, actx, tree, hf_index, dissect_t38_IFPPacket);
 833
 834 #line 244 "t38.cnf"
 835     /* if is a valid t38 packet, add to tap */
 836     if (p_t38_packet_conv && (!actx->pinfo->in_error_pkt) && ((gint32) seq_number != p_t38_packet_conv_info->last_seqnum))
 837         tap_queue_packet(t38_tap, actx->pinfo, t38_info);
 838
 839     if (p_t38_conv) p_t38_conv_info->last_seqnum = (gint32) seq_number;
 840
 841   return offset;
 842 }
 843
 844
 845
 846 static int
 847 dissect_t38_OpenType_IFPPacket(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 848   offset = dissect_per_open_type(tvb, offset, actx, tree, hf_index, dissect_t38_IFPPacket);
 849
 850   return offset;
 851 }
 852
 853
 854 static const per_sequence_t T_secondary_ifp_packets_sequence_of[1] = {
 855   { &hf_t38_secondary_ifp_packets_item, ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_OpenType_IFPPacket },
 856 };
 857
 858 static int
 859 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_) {
 860   offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
 861                                       ett_t38_T_secondary_ifp_packets, T_secondary_ifp_packets_sequence_of);
 862
 863   return offset;
 864 }
 865
 866
 867
 868 static int
 869 dissect_t38_INTEGER(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 870   offset = dissect_per_integer(tvb, offset, actx, tree, hf_index, NULL);
 871
 872   return offset;
 873 }
 874
 875
 876
 877 static int
 878 dissect_t38_OCTET_STRING(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 879   offset = dissect_per_octet_string(tvb, offset, actx, tree, hf_index,
 880                                        NO_BOUND, NO_BOUND, FALSE, NULL);
 881
 882   return offset;
 883 }
 884
 885
 886 static const per_sequence_t T_fec_data_sequence_of[1] = {
 887   { &hf_t38_fec_data_item   , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_OCTET_STRING },
 888 };
 889
 890 static int
 891 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_) {
 892   offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
 893                                       ett_t38_T_fec_data, T_fec_data_sequence_of);
 894
 895   return offset;
 896 }
 897
 898
 899 static const per_sequence_t T_fec_info_sequence[] = {
 900   { &hf_t38_fec_npackets    , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_INTEGER },
 901   { &hf_t38_fec_data        , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_fec_data },
 902   { NULL, 0, 0, NULL }
 903 };
 904
 905 static int
 906 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_) {
 907   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 908                                    ett_t38_T_fec_info, T_fec_info_sequence);
 909
 910   return offset;
 911 }
 912
 913
 914 static const value_string t38_T_error_recovery_vals[] = {
 915   {   0, "secondary-ifp-packets" },
 916   {   1, "fec-info" },
 917   { 0, NULL }
 918 };
 919
 920 static const per_choice_t T_error_recovery_choice[] = {
 921   {   0, &hf_t38_secondary_ifp_packets, ASN1_NO_EXTENSIONS     , dissect_t38_T_secondary_ifp_packets },
 922   {   1, &hf_t38_fec_info        , ASN1_NO_EXTENSIONS     , dissect_t38_T_fec_info },
 923   { 0, NULL, 0, NULL }
 924 };
 925
 926 static int
 927 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_) {
 928 #line 252 "t38.cnf"
 929     primary_part = FALSE;
 930
 931   offset = dissect_per_choice(tvb, offset, actx, tree, hf_index,
 932                                  ett_t38_T_error_recovery, T_error_recovery_choice,
 933                                  NULL);
 934
 935 #line 254 "t38.cnf"
 936     primary_part = TRUE;
 937
 938   return offset;
 939 }
 940
 941
 942 static const per_sequence_t UDPTLPacket_sequence[] = {
 943   { &hf_t38_seq_number      , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_seq_number },
 944   { &hf_t38_primary_ifp_packet, ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_primary_ifp_packet },
 945   { &hf_t38_error_recovery  , ASN1_NO_EXTENSIONS     , ASN1_NOT_OPTIONAL, dissect_t38_T_error_recovery },
 946   { NULL, 0, 0, NULL }
 947 };
 948
 949 static int
 950 dissect_t38_UDPTLPacket(tvbuff_t *tvb _U_, int offset _U_, asn1_ctx_t *actx _U_, proto_tree *tree _U_, int hf_index _U_) {
 951 #line 226 "t38.cnf"
 952     /* Initialize to something else than data type */
 953     Data_Field_field_type_value = 1;
 954
 955   offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
 956                                    ett_t38_UDPTLPacket, UDPTLPacket_sequence);
 957
 958   return offset;
 959 }
 960
 961 /*--- PDUs ---*/
 962
 963 static int dissect_IFPPacket_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_) {
 964   int offset = 0;
 965   asn1_ctx_t asn1_ctx;
 966   asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
 967   offset = dissect_t38_IFPPacket(tvb, offset, &asn1_ctx, tree, hf_t38_IFPPacket_PDU);
 968   offset += 7; offset >>= 3;
 969   return offset;
 970 }
 971 static int dissect_UDPTLPacket_PDU(tvbuff_t *tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_) {
 972   int offset = 0;
 973   asn1_ctx_t asn1_ctx;
 974   asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
 975   offset = dissect_t38_UDPTLPacket(tvb, offset, &asn1_ctx, tree, hf_t38_UDPTLPacket_PDU);
 976   offset += 7; offset >>= 3;
 977   return offset;
 978 }
 979
 980
 981 /*--- End of included file: packet-t38-fn.c ---*/
 982 #line 402 "packet-t38-template.c"
 983
 984 /* initialize the tap t38_info and the conversation */
 985 static void
 986 init_t38_info_conv(packet_info *pinfo)
 987 {
 988         /* tap info */
 989         t38_info_current++;
 990         if (t38_info_current==MAX_T38_MESSAGES_IN_PACKET) {
 991                 t38_info_current=0;
 992         }
 993         t38_info = &t38_info_arr[t38_info_current];
 994
 995         t38_info->seq_num = 0;
 996         t38_info->type_msg = 0;
 997         t38_info->data_value = 0;
 998         t38_info->t30ind_value =0;
 999         t38_info->setup_frame_number = 0;
1000         t38_info->Data_Field_field_type_value = 0;
1001         t38_info->desc[0] = '\0';
1002         t38_info->desc_comment[0] = '\0';
1003         t38_info->time_first_t4_data = 0;
1004         t38_info->frame_num_first_t4_data = 0;
1005
1006
1007         /*
1008                 p_t38_packet_conv hold the conversation info in each of the packets.
1009                 p_t38_conv hold the conversation info used to reassemble the HDLC packets, and also the Setup info (e.g SDP)
1010                 If we already have p_t38_packet_conv in the packet, it means we already reassembled the HDLC packets, so we don't
1011                 need to use p_t38_conv
1012         */
1013         p_t38_packet_conv = NULL;
1014         p_t38_conv = NULL;
1015
1016         /* Use existing packet info if available */
1017          p_t38_packet_conv = p_get_proto_data(pinfo->fd, proto_t38);
1018
1019
1020         /* find the conversation used for Reassemble and Setup Info */
1021         p_conv = find_conversation(pinfo->fd->num, &pinfo->net_src, &pinfo->net_dst,
1022                                    pinfo->ptype,
1023                                    pinfo->srcport, pinfo->destport, NO_ADDR_B | NO_PORT_B);
1024
1025         /* create a conv if it doen't exist */
1026         if (!p_conv) {
1027                 p_conv = conversation_new(pinfo->fd->num, &pinfo->net_src, &pinfo->net_dst,
1028                               pinfo->ptype, pinfo->srcport, pinfo->destport, NO_ADDR_B | NO_PORT_B);
1029
1030                 /* Set dissector */
1031                 conversation_set_dissector(p_conv, t38_udp_handle);
1032         }
1033
1034         if (!p_t38_packet_conv) {
1035                 p_t38_conv = conversation_get_proto_data(p_conv, proto_t38);
1036
1037                 /* create the conversation if it doen't exist */
1038                 if (!p_t38_conv) {
1039                         p_t38_conv = se_alloc(sizeof(t38_conv));
1040                         p_t38_conv->setup_method[0] = '\0';
1041                         p_t38_conv->setup_frame_number = 0;
1042
1043                         p_t38_conv->src_t38_info.reass_ID = 0;
1044                         p_t38_conv->src_t38_info.reass_start_seqnum = -1;
1045                         p_t38_conv->src_t38_info.reass_data_type = 0;
1046                         p_t38_conv->src_t38_info.last_seqnum = -1;
1047                         p_t38_conv->src_t38_info.packet_lost = 0;
1048                         p_t38_conv->src_t38_info.burst_lost = 0;
1049                         p_t38_conv->src_t38_info.time_first_t4_data = 0;
1050
1051                         p_t38_conv->dst_t38_info.reass_ID = 0;
1052                         p_t38_conv->dst_t38_info.reass_start_seqnum = -1;
1053                         p_t38_conv->dst_t38_info.reass_data_type = 0;
1054                         p_t38_conv->dst_t38_info.last_seqnum = -1;
1055                         p_t38_conv->dst_t38_info.packet_lost = 0;
1056                         p_t38_conv->dst_t38_info.burst_lost = 0;
1057                         p_t38_conv->dst_t38_info.time_first_t4_data = 0;
1058
1059                         conversation_add_proto_data(p_conv, proto_t38, p_t38_conv);
1060                 }
1061
1062                 /* copy the t38 conversation info to the packet t38 conversation */
1063                 p_t38_packet_conv = se_alloc(sizeof(t38_conv));
1064                 strcpy(p_t38_packet_conv->setup_method, p_t38_conv->setup_method);
1065                 p_t38_packet_conv->setup_frame_number = p_t38_conv->setup_frame_number;
1066
1067                 memcpy(&(p_t38_packet_conv->src_t38_info), &(p_t38_conv->src_t38_info), sizeof(t38_conv_info));
1068                 memcpy(&(p_t38_packet_conv->dst_t38_info), &(p_t38_conv->dst_t38_info), sizeof(t38_conv_info));
1069
1070                 p_add_proto_data(pinfo->fd, proto_t38, p_t38_packet_conv);
1071         }
1072
1073         if (ADDRESSES_EQUAL(&p_conv->key_ptr->addr1, &pinfo->net_src)) {
1074                 p_t38_conv_info = &(p_t38_conv->src_t38_info);
1075                 p_t38_packet_conv_info = &(p_t38_packet_conv->src_t38_info);
1076         } else {
1077                 p_t38_conv_info = &(p_t38_conv->dst_t38_info);
1078                 p_t38_packet_conv_info = &(p_t38_packet_conv->dst_t38_info);
1079         }
1080
1081         /* update t38_info */
1082         t38_info->setup_frame_number = p_t38_packet_conv->setup_frame_number;
1083 }
1084
1085 /* Entry point for dissection */
1086 static void
1087 dissect_t38_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1088 {
1089         guint8 octet1;
1090         proto_item *it;
1091         proto_tree *tr;
1092         guint32 offset=0;
1093
1094         /*
1095          * XXX - heuristic to check for misidentified packets.
1096          */
1097         if (dissect_possible_rtpv2_packets_as_rtp){
1098                 octet1 = tvb_get_guint8(tvb, offset);
1099                 if (RTP_VERSION(octet1) == 2){
1100                         call_dissector(rtp_handle,tvb,pinfo,tree);
1101                         return;
1102                 }
1103         }
1104
1105         if (check_col(pinfo->cinfo, COL_PROTOCOL)){
1106                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.38");
1107         }
1108         if (check_col(pinfo->cinfo, COL_INFO)){
1109                 col_clear(pinfo->cinfo, COL_INFO);
1110         }
1111
1112         primary_part = TRUE;
1113
1114         /* This indicate the item number in the primary part of the T38 message, it is used for the reassemble of T30 packets */
1115         Data_Field_item_num = 0;
1116
1117         it=proto_tree_add_protocol_format(tree, proto_t38, tvb, 0, -1, "ITU-T Recommendation T.38");
1118         tr=proto_item_add_subtree(it, ett_t38);
1119
1120         /* init tap and conv info */
1121         init_t38_info_conv(pinfo);
1122
1123         /* Show Conversation setup info if exists*/
1124         if (global_t38_show_setup_info) {
1125                 show_setup_info(tvb, tr, p_t38_packet_conv);
1126         }
1127
1128         if (check_col(pinfo->cinfo, COL_INFO)){
1129                 col_append_str(pinfo->cinfo, COL_INFO, "UDP: UDPTLPacket ");
1130         }
1131
1132         offset = dissect_UDPTLPacket_PDU(tvb, pinfo, tr);
1133
1134         if (tvb_length_remaining(tvb,offset)>0){
1135                 if (tr){
1136                         proto_tree_add_text(tr, tvb, offset, tvb_reported_length_remaining(tvb, offset),
1137                                 "[MALFORMED PACKET or wrong preference settings]");
1138                 }
1139                 if (check_col(pinfo->cinfo, COL_INFO)){
1140                         col_append_str(pinfo->cinfo, COL_INFO, " [Malformed?]");
1141                 }
1142         }
1143 }
1144
1145 static void
1146 dissect_t38_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1147 {
1148         proto_item *it;
1149         proto_tree *tr;
1150         guint32 offset=0;
1151     tvbuff_t *next_tvb;
1152         guint16 ifp_packet_number=1;
1153
1154         if (check_col(pinfo->cinfo, COL_PROTOCOL)){
1155                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.38");
1156         }
1157         if (check_col(pinfo->cinfo, COL_INFO)){
1158                 col_clear(pinfo->cinfo, COL_INFO);
1159         }
1160
1161         primary_part = TRUE;
1162
1163         /* This indicate the item number in the primary part of the T38 message, it is used for the reassemble of T30 packets */
1164         Data_Field_item_num = 0;
1165
1166         it=proto_tree_add_protocol_format(tree, proto_t38, tvb, 0, -1, "ITU-T Recommendation T.38");
1167         tr=proto_item_add_subtree(it, ett_t38);
1168
1169         /* init tap and conv info */
1170         init_t38_info_conv(pinfo);
1171
1172         /* Show Conversation setup info if exists*/
1173         if (global_t38_show_setup_info) {
1174                 show_setup_info(tvb, tr, p_t38_packet_conv);
1175         }
1176
1177         if (check_col(pinfo->cinfo, COL_INFO)){
1178                 col_append_str(pinfo->cinfo, COL_INFO, "TCP: IFPPacket");
1179         }
1180
1181         while(tvb_length_remaining(tvb,offset)>0)
1182         {
1183                 next_tvb = tvb_new_subset(tvb, offset, -1, -1);
1184                 offset += dissect_IFPPacket_PDU(next_tvb, pinfo, tr);
1185                 ifp_packet_number++;
1186
1187                 if(tvb_length_remaining(tvb,offset)>0){
1188                         if(t38_tpkt_usage == T38_TPKT_ALWAYS){
1189                                 if(tr){
1190                                         proto_tree_add_text(tr, tvb, offset, tvb_reported_length_remaining(tvb, offset),
1191                                                 "[MALFORMED PACKET or wrong preference settings]");
1192                                 }
1193                                 if (check_col(pinfo->cinfo, COL_INFO)){
1194                                         col_append_str(pinfo->cinfo, COL_INFO, " [Malformed?]");
1195                                 }
1196                                 break;
1197                         }
1198                         else {
1199                                 if (check_col(pinfo->cinfo, COL_INFO)){
1200                                         col_append_fstr(pinfo->cinfo, COL_INFO, " IFPPacket#%u",ifp_packet_number);
1201                                 }
1202                         }
1203                 }
1204         }
1205
1206 }
1207
1208 static void
1209 dissect_t38_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1210 {
1211         primary_part = TRUE;
1212
1213         if(t38_tpkt_usage == T38_TPKT_ALWAYS){
1214                 dissect_tpkt_encap(tvb,pinfo,tree,t38_tpkt_reassembly,t38_tcp_pdu_handle);
1215         }
1216         else if((t38_tpkt_usage == T38_TPKT_NEVER) || (is_tpkt(tvb,1) == -1)){
1217                 dissect_t38_tcp_pdu(tvb, pinfo, tree);
1218         }
1219         else {
1220                 dissect_tpkt_encap(tvb,pinfo,tree,t38_tpkt_reassembly,t38_tcp_pdu_handle);
1221         }
1222 }
1223
1224 static void
1225 dissect_t38(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1226 {
1227         if(pinfo->ipproto == IP_PROTO_TCP)
1228         {
1229                 dissect_t38_tcp(tvb, pinfo, tree);
1230         }
1231         else if(pinfo->ipproto == IP_PROTO_UDP)
1232         {
1233                 dissect_t38_udp(tvb, pinfo, tree);
1234         }
1235 }
1236
1237 /* Look for conversation info and display any setup info found */
1238 void
1239 show_setup_info(tvbuff_t *tvb, proto_tree *tree, t38_conv *p_t38_conv)
1240 {
1241         proto_tree *t38_setup_tree;
1242         proto_item *ti;
1243
1244         if (!p_t38_conv || p_t38_conv->setup_frame_number == 0) {
1245                 /* there is no Setup info */
1246                 return;
1247         }
1248
1249         ti =  proto_tree_add_string_format(tree, hf_t38_setup, tvb, 0, 0,
1250                       "",
1251                       "Stream setup by %s (frame %u)",
1252                       p_t38_conv->setup_method,
1253                       p_t38_conv->setup_frame_number);
1254     PROTO_ITEM_SET_GENERATED(ti);
1255     t38_setup_tree = proto_item_add_subtree(ti, ett_t38_setup);
1256     if (t38_setup_tree)
1257     {
1258                 /* Add details into subtree */
1259                 proto_item* item = proto_tree_add_uint(t38_setup_tree, hf_t38_setup_frame,
1260                                                                tvb, 0, 0, p_t38_conv->setup_frame_number);
1261                 PROTO_ITEM_SET_GENERATED(item);
1262                 item = proto_tree_add_string(t38_setup_tree, hf_t38_setup_method,
1263                                                      tvb, 0, 0, p_t38_conv->setup_method);
1264                 PROTO_ITEM_SET_GENERATED(item);
1265     }
1266 }
1267
1268
1269
1270 /* Wireshark Protocol Registration */
1271 void
1272 proto_register_t38(void)
1273 {
1274         static hf_register_info hf[] =
1275         {
1276
1277 /*--- Included file: packet-t38-hfarr.c ---*/
1278 #line 1 "packet-t38-hfarr.c"
1279     { &hf_t38_IFPPacket_PDU,
1280       { "IFPPacket", "t38.IFPPacket",
1281         FT_NONE, BASE_NONE, NULL, 0,
1282         "t38.IFPPacket", HFILL }},
1283     { &hf_t38_UDPTLPacket_PDU,
1284       { "UDPTLPacket", "t38.UDPTLPacket",
1285         FT_NONE, BASE_NONE, NULL, 0,
1286         "t38.UDPTLPacket", HFILL }},
1287     { &hf_t38_type_of_msg,
1288       { "type-of-msg", "t38.type_of_msg",
1289         FT_UINT32, BASE_DEC, VALS(t38_Type_of_msg_vals), 0,
1290         "t38.Type_of_msg", HFILL }},
1291     { &hf_t38_data_field,
1292       { "data-field", "t38.data_field",
1293         FT_UINT32, BASE_DEC, NULL, 0,
1294         "t38.Data_Field", HFILL }},
1295     { &hf_t38_t30_indicator,
1296       { "t30-indicator", "t38.t30_indicator",
1297         FT_UINT32, BASE_DEC, VALS(t38_T30_indicator_vals), 0,
1298         "t38.T30_indicator", HFILL }},
1299     { &hf_t38_t30_data,
1300       { "t30-data", "t38.t30_data",
1301         FT_UINT32, BASE_DEC, VALS(t38_T30_data_vals), 0,
1302         "t38.T30_data", HFILL }},
1303     { &hf_t38_Data_Field_item,
1304       { "Item", "t38.Data_Field_item",
1305         FT_NONE, BASE_NONE, NULL, 0,
1306         "t38.Data_Field_item", HFILL }},
1307     { &hf_t38_field_type,
1308       { "field-type", "t38.field_type",
1309         FT_UINT32, BASE_DEC, VALS(t38_T_field_type_vals), 0,
1310         "t38.T_field_type", HFILL }},
1311     { &hf_t38_field_data,
1312       { "field-data", "t38.field_data",
1313         FT_BYTES, BASE_HEX, NULL, 0,
1314         "t38.T_field_data", HFILL }},
1315     { &hf_t38_seq_number,
1316       { "seq-number", "t38.seq_number",
1317         FT_UINT32, BASE_DEC, NULL, 0,
1318         "t38.T_seq_number", HFILL }},
1319     { &hf_t38_primary_ifp_packet,
1320       { "primary-ifp-packet", "t38.primary_ifp_packet",
1321         FT_NONE, BASE_NONE, NULL, 0,
1322         "t38.T_primary_ifp_packet", HFILL }},
1323     { &hf_t38_error_recovery,
1324       { "error-recovery", "t38.error_recovery",
1325         FT_UINT32, BASE_DEC, VALS(t38_T_error_recovery_vals), 0,
1326         "t38.T_error_recovery", HFILL }},
1327     { &hf_t38_secondary_ifp_packets,
1328       { "secondary-ifp-packets", "t38.secondary_ifp_packets",
1329         FT_UINT32, BASE_DEC, NULL, 0,
1330         "t38.T_secondary_ifp_packets", HFILL }},
1331     { &hf_t38_secondary_ifp_packets_item,
1332       { "Item", "t38.secondary_ifp_packets_item",
1333         FT_NONE, BASE_NONE, NULL, 0,
1334         "t38.OpenType_IFPPacket", HFILL }},
1335     { &hf_t38_fec_info,
1336       { "fec-info", "t38.fec_info",
1337         FT_NONE, BASE_NONE, NULL, 0,
1338         "t38.T_fec_info", HFILL }},
1339     { &hf_t38_fec_npackets,
1340       { "fec-npackets", "t38.fec_npackets",
1341         FT_INT32, BASE_DEC, NULL, 0,
1342         "t38.INTEGER", HFILL }},
1343     { &hf_t38_fec_data,
1344       { "fec-data", "t38.fec_data",
1345         FT_UINT32, BASE_DEC, NULL, 0,
1346         "t38.T_fec_data", HFILL }},
1347     { &hf_t38_fec_data_item,
1348       { "Item", "t38.fec_data_item",
1349         FT_BYTES, BASE_HEX, NULL, 0,
1350         "t38.OCTET_STRING", HFILL }},
1351
1352 /*--- End of included file: packet-t38-hfarr.c ---*/
1353 #line 696 "packet-t38-template.c"
1354                 {   &hf_t38_setup,
1355                     { "Stream setup", "t38.setup", FT_STRING, BASE_NONE,
1356                     NULL, 0x0, "Stream setup, method and frame number", HFILL }},
1357                 {   &hf_t38_setup_frame,
1358             { "Stream frame", "t38.setup-frame", FT_FRAMENUM, BASE_NONE,
1359             NULL, 0x0, "Frame that set up this stream", HFILL }},
1360         {   &hf_t38_setup_method,
1361             { "Stream Method", "t38.setup-method", FT_STRING, BASE_NONE,
1362             NULL, 0x0, "Method used to set up this stream", HFILL }},
1363                 {&hf_data_fragments,
1364                         {"Message fragments", "data.fragments",
1365                         FT_NONE, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1366                 {&hf_data_fragment,
1367                         {"Message fragment", "data.fragment",
1368                         FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1369                 {&hf_data_fragment_overlap,
1370                         {"Message fragment overlap", "data.fragment.overlap",
1371                         FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1372                 {&hf_data_fragment_overlap_conflicts,
1373                         {"Message fragment overlapping with conflicting data",
1374                         "data.fragment.overlap.conflicts",
1375                         FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1376                 {&hf_data_fragment_multiple_tails,
1377                         {"Message has multiple tail fragments",
1378                         "data.fragment.multiple_tails",
1379                         FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1380                 {&hf_data_fragment_too_long_fragment,
1381                         {"Message fragment too long", "data.fragment.too_long_fragment",
1382                         FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1383                 {&hf_data_fragment_error,
1384                         {"Message defragmentation error", "data.fragment.error",
1385                         FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1386                 {&hf_data_reassembled_in,
1387                         {"Reassembled in", "data.reassembled.in",
1388                         FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL } },
1389         };
1390
1391         static gint *ett[] =
1392         {
1393                 &ett_t38,
1394
1395 /*--- Included file: packet-t38-ettarr.c ---*/
1396 #line 1 "packet-t38-ettarr.c"
1397     &ett_t38_IFPPacket,
1398     &ett_t38_Type_of_msg,
1399     &ett_t38_Data_Field,
1400     &ett_t38_Data_Field_item,
1401     &ett_t38_UDPTLPacket,
1402     &ett_t38_T_error_recovery,
1403     &ett_t38_T_secondary_ifp_packets,
1404     &ett_t38_T_fec_info,
1405     &ett_t38_T_fec_data,
1406
1407 /*--- End of included file: packet-t38-ettarr.c ---*/
1408 #line 737 "packet-t38-template.c"
1409                 &ett_t38_setup,
1410                 &ett_data_fragment,
1411                 &ett_data_fragments
1412         };
1413
1414         module_t *t38_module;
1415
1416         proto_t38 = proto_register_protocol("T.38", "T.38", "t38");
1417         proto_register_field_array(proto_t38, hf, array_length(hf));
1418         proto_register_subtree_array(ett, array_length(ett));
1419         register_dissector("t38", dissect_t38, proto_t38);
1420
1421         /* Init reassemble tables for HDLC */
1422     register_init_routine(t38_defragment_init);
1423
1424         t38_tap = register_tap("t38");
1425
1426         t38_module = prefs_register_protocol(proto_t38, proto_reg_handoff_t38);
1427         prefs_register_bool_preference(t38_module, "use_pre_corrigendum_asn1_specification",
1428             "Use the Pre-Corrigendum ASN.1 specification",
1429             "Whether the T.38 dissector should decode using the Pre-Corrigendum T.38 "
1430                 "ASN.1 specification (1998).",
1431             &use_pre_corrigendum_asn1_specification);
1432         prefs_register_bool_preference(t38_module, "dissect_possible_rtpv2_packets_as_rtp",
1433             "Dissect possible RTP version 2 packets with RTP dissector",
1434             "Whether a UDP packet that looks like RTP version 2 packet will "
1435                 "be dissected as RTP packet or T.38 packet. If enabled there is a risk that T.38 UDPTL "
1436                 "packets with sequence number higher than 32767 may be dissected as RTP.",
1437             &dissect_possible_rtpv2_packets_as_rtp);
1438         prefs_register_uint_preference(t38_module, "tcp.port",
1439                 "T.38 TCP Port",
1440                 "Set the TCP port for T.38 messages",
1441                 10, &global_t38_tcp_port);
1442         prefs_register_uint_preference(t38_module, "udp.port",
1443                 "T.38 UDP Port",
1444                 "Set the UDP port for T.38 messages",
1445                 10, &global_t38_udp_port);
1446         prefs_register_bool_preference(t38_module, "reassembly",
1447                 "Reassemble T.38 PDUs over TPKT over TCP",
1448                 "Whether the dissector should reassemble T.38 PDUs spanning multiple TCP segments "
1449                 "when TPKT is used over TCP. "
1450         "To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
1451                 &t38_tpkt_reassembly);
1452         prefs_register_enum_preference(t38_module, "tpkt_usage",
1453                 "TPKT used over TCP",
1454                 "Whether T.38 is used with TPKT for TCP",
1455                 (gint *)&t38_tpkt_usage,t38_tpkt_options,FALSE);
1456
1457         prefs_register_bool_preference(t38_module, "show_setup_info",
1458                 "Show stream setup information",
1459                 "Where available, show which protocol and frame caused "
1460                 "this T.38 stream to be created",
1461                 &global_t38_show_setup_info);
1462
1463 }
1464
1465 void
1466 proto_reg_handoff_t38(void)
1467 {
1468         static int t38_prefs_initialized = FALSE;
1469
1470         if (!t38_prefs_initialized) {
1471                 t38_udp_handle=create_dissector_handle(dissect_t38_udp, proto_t38);
1472                 t38_tcp_handle=create_dissector_handle(dissect_t38_tcp, proto_t38);
1473                 t38_tcp_pdu_handle=create_dissector_handle(dissect_t38_tcp_pdu, proto_t38);
1474                 t38_prefs_initialized = TRUE;
1475         }
1476         else {
1477                 dissector_delete("tcp.port", tcp_port, t38_tcp_handle);
1478                 dissector_delete("udp.port", udp_port, t38_udp_handle);
1479         }
1480         tcp_port = global_t38_tcp_port;
1481         udp_port = global_t38_udp_port;
1482
1483         dissector_add("tcp.port", tcp_port, t38_tcp_handle);
1484         dissector_add("udp.port", udp_port, t38_udp_handle);
1485
1486         rtp_handle = find_dissector("rtp");
1487         t30_hdlc_handle = find_dissector("t30.hdlc");
1488         data_handle = find_dissector("data");
1489 }
1490
1491
1492
1493