/builds/wireshark/wireshark/epan/dissectors/packet-t38.c

Bug Summary

File:	builds/wireshark/wireshark/epan/dissectors/packet-t38.c
Warning:	line 388, column 12 Potential leak of memory pointed to by 'data'
Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name packet-t38.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -fno-delete-null-pointer-checks -mframe-pointer=all -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -ffloat16-excess-precision=fast -fbfloat16-excess-precision=fast -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/builds/wireshark/wireshark/build -fcoverage-compilation-dir=/builds/wireshark/wireshark/build -resource-dir /usr/lib/llvm-21/lib/clang/21 -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /builds/wireshark/wireshark/epan/dissectors -isystem /builds/wireshark/wireshark/build/epan/dissectors -isystem /usr/include/mit-krb5 -isystem /usr/include/libxml2 -isystem /builds/wireshark/wireshark/epan -D G_DISABLE_DEPRECATED -D G_DISABLE_SINGLE_INCLUDES -D WS_BUILD_DLL -D WS_DEBUG -D WS_DEBUG_UTF_8 -I /builds/wireshark/wireshark/build -I /builds/wireshark/wireshark -I /builds/wireshark/wireshark/include -D _GLIBCXX_ASSERTIONS -internal-isystem /usr/lib/llvm-21/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/builds/wireshark/wireshark/= -fmacro-prefix-map=/builds/wireshark/wireshark/build/= -fmacro-prefix-map=../= -Wno-format-nonliteral -std=gnu11 -ferror-limit 19 -fvisibility=hidden -fwrapv -fwrapv-pointer -fstrict-flex-arrays=3 -stack-protector 2 -fstack-clash-protection -fcf-protection=full -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fexceptions -fcolor-diagnostics -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /builds/wireshark/wireshark/sbout/2026-01-29-100357-3623-1 -x c /builds/wireshark/wireshark/epan/dissectors/packet-t38.c
1/* Do not modify this file. Changes will be overwritten.                      */
2/* Generated automatically by the ASN.1 to Wireshark dissector compiler       */
3/* packet-t38.c                                                               */
4/* asn2wrs.py -q -L -p t38 -c ./t38.cnf -s ./packet-t38-template -D . -O ../.. T38_2002.asn */

6/* packet-t38.c
* Routines for T.38 packet dissection
* 2003  Hans Viens
* 2004  Alejandro Vaquero, add support Conversations for SDP
* 2006  Alejandro Vaquero, add T30 reassemble and dissection
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <[email protected]>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/


20/* Depending on what ASN.1 specification is used you may have to change
* the preference setting regarding Pre-Corrigendum ASN.1 specification:
* http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/1998/T38.html  (Pre-Corrigendum=true)
* http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2003/T38(1998).html (Pre-Corrigendum=true)
*
* http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2003/T38(2002).html (Pre-Corrigendum=false)
* http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2002/t38.html  (Pre-Corrigendum=false)
* http://www.itu.int/ITU-T/asn1/database/itu-t/t/t38/2002-Amd1/T38.html (Pre-Corrigendum=false)
*/

30/* TO DO:
* - TCP desegmentation is currently not supported for T.38 IFP directly over TCP.
* - H.245 dissectors should be updated to start conversations for T.38 similar to RTP.
* - Sometimes the last octet is not high-lighted when selecting something in the tree. Bug in PER dissector?
* - Add support for RTP payload audio/t38 (draft-jones-avt-audio-t38-03.txt), i.e. T38 in RTP packets.
*/


38#include "config.h"

40#include <epan/packet.h>
41#include <epan/reassemble.h>
42#include <epan/conversation.h>
43#include <epan/tap.h>
44#include <epan/expert.h>
45#include <epan/strutil.h>
46#include <epan/prefs.h>
47#include <epan/asn1.h>
48#include <epan/proto_data.h>
49#include <wsutil/array.h>
50#include <epan/iana-info.h>

52#include "packet-t38.h"
53#include "packet-per.h"
54#include "packet-tpkt.h"
55#include "packet-acdr.h"

57void proto_register_t38(void);

59static int t38_tap;

61/* dissect using the Pre Corrigendum T.38 ASN.1 specification (1998) */
62static bool_Bool use_pre_corrigendum_asn1_specification = true1;

64/* dissect packets that looks like RTP version 2 packets as RTP     */
65/* instead of as T.38. This may result in that some T.38 UPTL       */
66/* packets with sequence number values higher than 32767 may be     */
67/* shown as RTP packets.                                            */
68static bool_Bool dissect_possible_rtpv2_packets_as_rtp;


71/* Reassembly of T.38 PDUs over TPKT over TCP */
72static bool_Bool t38_tpkt_reassembly = true1;

74/* Preference setting whether TPKT header is used when sending T.38 over TCP.
* The default setting is Maybe where the dissector will look on the first
* bytes to try to determine whether TPKT header is used or not. This may not
* work so well in some cases. You may want to change the setting to Always or
* Newer.
*/
80#define T38_TPKT_NEVER0 0   /* Assume that there is never a TPKT header    */
81#define T38_TPKT_ALWAYS1 1  /* Assume that there is always a TPKT header   */
82#define T38_TPKT_MAYBE2 2   /* Assume TPKT if first octets are 03-00-xx-xx */
83static int t38_tpkt_usage = T38_TPKT_MAYBE2;

85static const enum_val_t t38_tpkt_options[] = {
{"never", "Never", T38_TPKT_NEVER0},
{"always", "Always", T38_TPKT_ALWAYS1},
{"maybe", "Maybe", T38_TPKT_MAYBE2},
{NULL((void*)0), NULL((void*)0), -1}
90};



94/* T38 */
95static dissector_handle_t t38_udp_handle;
96static dissector_handle_t t38_tcp_handle;
97static dissector_handle_t t38_tcp_pdu_handle;
98static dissector_handle_t rtp_handle;
99static dissector_handle_t t30_hdlc_handle;
100static dissector_handle_t data_handle;

102static int32_t Type_of_msg_value;
103static uint32_t Data_Field_field_type_value;
104static uint32_t Data_value;
105static uint32_t T30ind_value;
106static uint32_t Data_Field_item_num;

108static int proto_t38;
109static int proto_acdr;
110static int hf_t38_IFPPacket_PDU;                  /* IFPPacket */
111static int hf_t38_UDPTLPacket_PDU;                /* UDPTLPacket */
112static int hf_t38_type_of_msg;                    /* Type_of_msg */
113static int hf_t38_data_field;                     /* Data_Field */
114static int hf_t38_t30_indicator;                  /* T30_indicator */
115static int hf_t38_t30_data;                       /* T30_data */
116static int hf_t38_Data_Field_item;                /* Data_Field_item */
117static int hf_t38_field_type;                     /* T_field_type */
118static int hf_t38_field_data;                     /* T_field_data */
119static int hf_t38_seq_number;                     /* T_seq_number */
120static int hf_t38_primary_ifp_packet;             /* T_primary_ifp_packet */
121static int hf_t38_error_recovery;                 /* T_error_recovery */
122static int hf_t38_secondary_ifp_packets;          /* T_secondary_ifp_packets */
123static int hf_t38_secondary_ifp_packets_item;     /* OpenType_IFPPacket */
124static int hf_t38_fec_info;                       /* T_fec_info */
125static int hf_t38_fec_npackets;                   /* INTEGER */
126static int hf_t38_fec_data;                       /* T_fec_data */
127static int hf_t38_fec_data_item;                  /* OCTET_STRING */

129/* T38 setup fields */
130static int hf_t38_setup;
131static int hf_t38_setup_frame;
132static int hf_t38_setup_method;

134/* T38 Data reassemble fields */
135static int hf_t38_fragments;
136static int hf_t38_fragment;
137static int hf_t38_fragment_overlap;
138static int hf_t38_fragment_overlap_conflicts;
139static int hf_t38_fragment_multiple_tails;
140static int hf_t38_fragment_too_long_fragment;
141static int hf_t38_fragment_error;
142static int hf_t38_fragment_count;
143static int hf_t38_reassembled_in;
144static int hf_t38_reassembled_length;

146static int ett_t38;
147static int ett_t38_IFPPacket;
148static int ett_t38_Type_of_msg;
149static int ett_t38_Data_Field;
150static int ett_t38_Data_Field_item;
151static int ett_t38_UDPTLPacket;
152static int ett_t38_T_error_recovery;
153static int ett_t38_T_secondary_ifp_packets;
154static int ett_t38_T_fec_info;
155static int ett_t38_T_fec_data;
156static int ett_t38_setup;

158static int ett_data_fragment;
159static int ett_data_fragments;

161static expert_field ei_t38_malformed;

163static bool_Bool primary_part = true1;
164static uint32_t seq_number;

166/* Tables for reassembly of Data fragments. */
167static reassembly_table data_reassembly_table;

169static const fragment_items data_frag_items = {
/* Fragment subtrees */
&ett_data_fragment,
&ett_data_fragments,
/* Fragment fields */
&hf_t38_fragments,
&hf_t38_fragment,
&hf_t38_fragment_overlap,
&hf_t38_fragment_overlap_conflicts,
&hf_t38_fragment_multiple_tails,
&hf_t38_fragment_too_long_fragment,
&hf_t38_fragment_error,
&hf_t38_fragment_count,
/* Reassembled in field */
&hf_t38_reassembled_in,
/* Reassembled length field */
&hf_t38_reassembled_length,
/* Reassembled data field */
NULL((void*)0),
/* Tag */
"Data fragments"
190};

192typedef struct _fragment_key {
address src;
address dst;
uint32_t	id;
196} fragment_key;

198static conversation_t *p_conv;
199static t38_conv *p_t38_conv;
200static t38_conv *p_t38_packet_conv;
201static t38_conv_info *p_t38_conv_info;
202static t38_conv_info *p_t38_packet_conv_info;

204/* RTP Version is the first 2 bits of the first octet in the UDP payload*/
205#define RTP_VERSION(octet)((octet) >> 6)	((octet) >> 6)

207void proto_reg_handoff_t38(void);

209static void show_setup_info(tvbuff_t *tvb, proto_tree *tree, t38_conv *p_t38_conv);
210/* Preferences bool to control whether or not setup info should be shown */
211static bool_Bool global_t38_show_setup_info = true1;

213/* Can tap up to 4 T38 packets within same packet */
214/* We only tap the primary part, not the redundancy */
215#define MAX_T38_MESSAGES_IN_PACKET4 4
216static t38_packet_info t38_info_arr[MAX_T38_MESSAGES_IN_PACKET4];
217static int t38_info_current=0;
218static t38_packet_info *t38_info;


221/* Set up an T38 conversation */
222void t38_add_address(packet_info *pinfo,
                   address *addr, int port,
                   int other_port,
                   const char *setup_method, uint32_t setup_frame_number)
226{
      address null_addr;
      conversation_t* p_conversation;
      t38_conv* p_conversation_data = NULL((void*)0);

      /*
       * If this isn't the first time this packet has been processed,
       * we've already done this work, so we don't need to do it
       * again.
       */
      if ((pinfo->fd->visited) || (t38_udp_handle == NULL((void*)0)))
      {
              return;
      }

      clear_address(&null_addr);

      /*
       * Check if the ip address and port combination is not
       * already registered as a conversation.
       */
      p_conversation = find_conversation_strat_xtd(pinfo, setup_frame_number, addr, &null_addr, CONVERSATION_UDP, port, other_port,
                              NO_ADDR_B0x00010000 | (!other_port ? NO_PORT_B0x00020000 : 0));


      /*
       * If not, create a new conversation.
       */
      if ( !p_conversation || p_conversation->setup_frame != setup_frame_number) {
              p_conversation = conversation_new_strat_xtd(pinfo, setup_frame_number, addr, &null_addr, CONVERSATION_UDP,
                                         (uint32_t)port, (uint32_t)other_port,
                                                                 NO_ADDR20x01 | (!other_port ? NO_PORT20x02 : 0));
      }

      /* Set dissector */
      conversation_set_dissector(p_conversation, t38_udp_handle);

      /*
       * Check if the conversation has data associated with it.
       */
      p_conversation_data = (t38_conv*)conversation_get_proto_data(p_conversation, proto_t38);

      /*
       * If not, add a new data item.
       */
      if ( ! p_conversation_data ) {
              /* Create conversation data */
              p_conversation_data = wmem_new(wmem_file_scope(), t38_conv)((t38_conv*)wmem_alloc((wmem_file_scope()), sizeof(t38_conv))
);

              conversation_add_proto_data(p_conversation, proto_t38, p_conversation_data);
      }

      /*
       * Update the conversation data.
       */
      (void) g_strlcpy(p_conversation_data->setup_method, setup_method, MAX_T38_SETUP_METHOD_SIZE7);
      p_conversation_data->setup_frame_number = setup_frame_number;
      p_conversation_data->src_t38_info.reass_ID = 0;
      p_conversation_data->src_t38_info.reass_start_seqnum = -1;
      p_conversation_data->src_t38_info.reass_start_data_field = 0;
      p_conversation_data->src_t38_info.reass_data_type = 0;
      p_conversation_data->src_t38_info.last_seqnum = -1;
      p_conversation_data->src_t38_info.packet_lost = 0;
      p_conversation_data->src_t38_info.burst_lost = 0;
      p_conversation_data->src_t38_info.time_first_t4_data = 0;
      p_conversation_data->src_t38_info.additional_hdlc_data_field_counter = 0;
      p_conversation_data->src_t38_info.seqnum_prev_data_field = -1;
      p_conversation_data->src_t38_info.next = NULL((void*)0);

      p_conversation_data->dst_t38_info.reass_ID = 0;
      p_conversation_data->dst_t38_info.reass_start_seqnum = -1;
      p_conversation_data->dst_t38_info.reass_start_data_field = 0;
      p_conversation_data->dst_t38_info.reass_data_type = 0;
      p_conversation_data->dst_t38_info.last_seqnum = -1;
      p_conversation_data->dst_t38_info.packet_lost = 0;
      p_conversation_data->dst_t38_info.burst_lost = 0;
      p_conversation_data->dst_t38_info.time_first_t4_data = 0;
      p_conversation_data->dst_t38_info.additional_hdlc_data_field_counter = 0;
      p_conversation_data->dst_t38_info.seqnum_prev_data_field = -1;
      p_conversation_data->dst_t38_info.next = NULL((void*)0);
306}


309static fragment_head *
310force_reassemble_seq(reassembly_table *table, packet_info *pinfo, uint32_t id)
311{
fragment_head *fd_head;
fragment_item *fd_i;
fragment_item *last_fd;
uint32_t dfpos, size, packet_lost, burst_lost, seq_num;
uint8_t *data;

fd_head = fragment_get(table, pinfo, id, NULL((void*)0));

/* have we already seen this frame ?*/
if (pinfo->fd->visited) {
17
←
Assuming field 'visited' is 0→
18
←
Taking false branch→
if (fd_head != NULL((void*)0) && fd_head->flags & FD_DEFRAGMENTED0x0001) {
	return fd_head;
} else {
	return NULL((void*)0);
}
}

if (fd_head==NULL((void*)0)){
19
←
Assuming 'fd_head' is not equal to NULL→
20
←
Taking false branch→
/* we must have it to continue */
return NULL((void*)0);
}

/* check for packet lost and count the burst of packet lost */
packet_lost = 0;
burst_lost = 0;
seq_num = 0;
for(fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
21
←
Loop condition is false. Execution continues on line 351→
if (seq_num != fd_i->offset) {
	packet_lost += fd_i->offset - seq_num;
	if ( (fd_i->offset - seq_num) > burst_lost ) {
		burst_lost = fd_i->offset - seq_num;
	}
}
seq_num = fd_i->offset + 1;
}

/* we have received an entire packet, defragment it and
* free all fragments
*/
size=0;
last_fd=NULL((void*)0);
for(fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
22
←
Loop condition is false. Execution continues on line 360→
 if(!last_fd || last_fd->offset!=fd_i->offset){
   size+=fd_i->len;
 }
 last_fd=fd_i;
}

data = (uint8_t *) g_malloc(size);
23
←
Memory is allocated→
fd_head->tvb_data = tvb_new_real_data(data, size, size);
      tvb_set_free_cb(fd_head->tvb_data, g_free);
fd_head->len = size;		/* record size for caller	*/

/* add all data fragments */
dfpos = 0;
last_fd=NULL((void*)0);
for (fd_i=fd_head->next;fd_i23.1
'fd_i' is null
 && fd_i->len + dfpos <= size;fd_i=fd_i->next) {
 if (fd_i->len) {
   if(!last_fd || last_fd->offset!=fd_i->offset){
     tvb_memcpy(fd_i->tvb_data, data+dfpos, 0, fd_i->len);
     dfpos += fd_i->len;
   } else {
     /* duplicate/retransmission/overlap */
     fd_i->flags    |= FD_OVERLAP0x0002;
     fd_head->flags |= FD_OVERLAP0x0002;
     if( (last_fd->len!=fd_i->len)
  || tvb_memeql(last_fd->tvb_data, 0, tvb_get_ptr(fd_i->tvb_data, 0, last_fd->len), last_fd->len) ){
	fd_i->flags    |= FD_OVERLAPCONFLICT0x0004;
	fd_head->flags |= FD_OVERLAPCONFLICT0x0004;
     }
   }
 }
 last_fd=fd_i;
}

/* we have defragmented the pdu, now free all fragments*/
for (fd_i=fd_head->next;fd_i;fd_i=fd_i->next) {
24
←
Potential leak of memory pointed to by 'data'
 if(fd_i->tvb_data){
   tvb_free(fd_i->tvb_data);
   fd_i->tvb_data=NULL((void*)0);
 }
}

/* mark this packet as defragmented */
fd_head->flags |= FD_DEFRAGMENTED0x0001;
fd_head->reassembled_in=pinfo->num;

col_append_fstr(pinfo->cinfo, COL_INFO, " (t4-data Reassembled: %d pack lost, %d pack burst lost)", packet_lost, burst_lost);

p_t38_packet_conv_info->packet_lost = packet_lost;
p_t38_packet_conv_info->burst_lost = burst_lost;

return fd_head;
405}

407/* T38 Routines */

409const value_string t38_T30_indicator_vals[] = {
{   0, "no-signal" },
{   1, "cng" },
{   2, "ced" },
{   3, "v21-preamble" },
{   4, "v27-2400-training" },
{   5, "v27-4800-training" },
{   6, "v29-7200-training" },
{   7, "v29-9600-training" },
{   8, "v17-7200-short-training" },
{   9, "v17-7200-long-training" },
{  10, "v17-9600-short-training" },
{  11, "v17-9600-long-training" },
{  12, "v17-12000-short-training" },
{  13, "v17-12000-long-training" },
{  14, "v17-14400-short-training" },
{  15, "v17-14400-long-training" },
{  16, "v8-ansam" },
{  17, "v8-signal" },
{  18, "v34-cntl-channel-1200" },
{  19, "v34-pri-channel" },
{  20, "v34-CC-retrain" },
{  21, "v33-12000-training" },
{  22, "v33-14400-training" },
{ 0, NULL((void*)0) }
434};


437static unsigned
438dissect_t38_T30_indicator(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
                                   16, &T30ind_value, true1, 7, NULL((void*)0));

  if (primary_part){
      col_append_fstr(actx->pinfo->cinfo, COL_INFO, " t30ind: %s",
       val_to_str_const(T30ind_value,t38_T30_indicator_vals,"<unknown>"));
  }

  /* info for tap */
  if (primary_part)
      t38_info->t30ind_value = T30ind_value;
return offset;
451}


454const value_string t38_T30_data_vals[] = {
{   0, "v21" },
{   1, "v27-2400" },
{   2, "v27-4800" },
{   3, "v29-7200" },
{   4, "v29-9600" },
{   5, "v17-7200" },
{   6, "v17-9600" },
{   7, "v17-12000" },
{   8, "v17-14400" },
{   9, "v8" },
{  10, "v34-pri-rate" },
{  11, "v34-CC-1200" },
{  12, "v34-pri-ch" },
{  13, "v33-12000" },
{  14, "v33-14400" },
{ 0, NULL((void*)0) }
471};


474static unsigned
475dissect_t38_T30_data(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
                                   9, &Data_value, true1, 6, NULL((void*)0));

  if (primary_part){
      col_append_fstr(actx->pinfo->cinfo, COL_INFO, " data:%s:",
       val_to_str_const(Data_value,t38_T30_data_vals,"<unknown>"));
  }


  /* info for tap */
  if (primary_part)
      t38_info->data_value = Data_value;
return offset;
489}


492static const value_string t38_Type_of_msg_vals[] = {
{   0, "t30-indicator" },
{   1, "t30-data" },
{ 0, NULL((void*)0) }
496};

498static const per_choice_t Type_of_msg_choice[] = {
{   0, &hf_t38_t30_indicator   , ASN1_NO_EXTENSIONS0     , dissect_t38_T30_indicator },
{   1, &hf_t38_t30_data        , ASN1_NO_EXTENSIONS0     , dissect_t38_T30_data },
{ 0, NULL((void*)0), 0, NULL((void*)0) }
502};

504static unsigned
505dissect_t38_Type_of_msg(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_choice(tvb, offset, actx, tree, hf_index,
                               ett_t38_Type_of_msg, Type_of_msg_choice,
                               &Type_of_msg_value);

/* info for tap */
if (primary_part)
  t38_info->type_msg = Type_of_msg_value;
return offset;
514}


517static const value_string t38_T_field_type_vals[] = {
{   0, "hdlc-data" },
{   1, "hdlc-sig-end" },
{   2, "hdlc-fcs-OK" },
{   3, "hdlc-fcs-BAD" },
{   4, "hdlc-fcs-OK-sig-end" },
{   5, "hdlc-fcs-BAD-sig-end" },
{   6, "t4-non-ecm-data" },
{   7, "t4-non-ecm-sig-end" },
{   8, "cm-message" },
{   9, "jm-message" },
{  10, "ci-message" },
{  11, "v34rate" },
{ 0, NULL((void*)0) }
531};


534static unsigned
535dissect_t38_T_field_type(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_enumerated(tvb, offset, actx, tree, hf_index,
2
←
'?' condition is false→
                                   8, &Data_Field_field_type_value, (use_pre_corrigendum_asn1_specification)?false0:true1, (use_pre_corrigendum_asn1_specification2.1
'use_pre_corrigendum_asn1_specification' is false
)?0:4, NULL((void*)0));
1
Assuming 'use_pre_corrigendum_asn1_specification' is false→
3
←
'?' condition is false→

  if (primary_part){
4
←
Assuming 'primary_part' is true→
5
←
Taking true branch→
      col_append_fstr(actx->pinfo->cinfo, COL_INFO, " %s",
       val_to_str_const(Data_Field_field_type_value,t38_T_field_type_vals,"<unknown>"));
  }

  if (primary_part) {
6
←
Assuming 'primary_part' is true→
      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*/
7
←
Assuming 'Data_Field_field_type_value' is equal to 2→
          fragment_head *frag_msg = NULL((void*)0);
          tvbuff_t* new_tvb = NULL((void*)0);
          bool_Bool save_fragmented = actx->pinfo->fragmented;

          actx->pinfo->fragmented = true1;

          /* if reass_start_seqnum=-1 it means we have received the end of the fragmente, without received any fragment data */
          if (p_t38_packet_conv_info->reass_start_seqnum != -1) {
8
←
Assuming the condition is true→
9
←
Taking true branch→
              uint32_t frag_seq_num;
              if (seq_number == (uint32_t)p_t38_packet_conv_info->reass_start_seqnum) {
10
←
Assuming 'seq_number' is equal to field 'reass_start_seqnum'→
11
←
Taking true branch→
                  frag_seq_num = (uint32_t)p_t38_packet_conv_info->additional_hdlc_data_field_counter + Data_Field_item_num - p_t38_packet_conv_info->reass_start_data_field;
              } else {
                  frag_seq_num = seq_number - (uint32_t)p_t38_packet_conv_info->reass_start_seqnum + (uint32_t)p_t38_packet_conv_info->additional_hdlc_data_field_counter + Data_Field_item_num;
              }
              frag_msg = fragment_add_seq(&data_reassembly_table, /* reassembly table */
                  tvb, offset, actx->pinfo,
                  p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
                  NULL((void*)0),
                  frag_seq_num,  /* fragment sequence number */
                  /*0,*/
                  0, /* fragment length */
                  false0, /* More fragments */
                  0);
              if ( Data_Field_field_type_value == 7 ) {
12
←
Assuming 'Data_Field_field_type_value' is equal to 7→
13
←
Taking true branch→
                  /* if there was packet lost or other errors during the defrag then frag_msg is NULL. This could also means
                   * there are out of order packets (e.g, got the tail frame t4-non-ecm-sig-end before the last fragment),
                   * but we will assume there was packet lost instead, which is more usual. So, we are going to reassemble the packet
                   * and get some stat, like packet lost and burst number of packet lost
                  */
                  if (!frag_msg) {
14
←
Assuming 'frag_msg' is null→
15
←
Taking true branch→
                      force_reassemble_seq(&data_reassembly_table, /* reassembly table */
16
←
Calling 'force_reassemble_seq'→
                          actx->pinfo,
                          p_t38_packet_conv_info->reass_ID /* ID for fragments belonging together */
                      );
                  } else {
                      col_append_str(actx->pinfo->cinfo, COL_INFO, " (t4-data Reassembled: No packet lost)");

                      snprintf(t38_info->desc_comment, MAX_T38_DESC128, "No packet lost");
                  }


                  if (p_t38_packet_conv_info->packet_lost) {
                      snprintf(t38_info->desc_comment, MAX_T38_DESC128, " Pack lost: %d, Pack burst lost: %d", p_t38_packet_conv_info->packet_lost, p_t38_packet_conv_info->burst_lost);
                  } else {
                      snprintf(t38_info->desc_comment, MAX_T38_DESC128, "No packet lost");
                  }

                  process_reassembled_data(tvb, offset, actx->pinfo,
                              "Reassembled T38", frag_msg, &data_frag_items, NULL((void*)0), tree);

                  /* Now reset fragmentation information in pinfo */
                  actx->pinfo->fragmented = save_fragmented;

                  t38_info->time_first_t4_data = p_t38_packet_conv_info->time_first_t4_data;
                  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 */

              } else {
                  new_tvb = process_reassembled_data(tvb, offset, actx->pinfo,
                              "Reassembled T38", frag_msg, &data_frag_items, NULL((void*)0), tree);

                  /* Now reset fragmentation information in pinfo */
                  actx->pinfo->fragmented = save_fragmented;

                  if (new_tvb) call_dissector_with_data((t30_hdlc_handle) ? t30_hdlc_handle : data_handle, new_tvb, actx->pinfo, tree, t38_info);
              }
          } else {
              /* If this is the same sequence number as the previous packet
               * (i.e., a retransmission), we don't expect to have any
               * fragment data (we reassembled it in the previous packet).
               */
              if (p_t38_packet_conv && ((int32_t) seq_number != p_t38_packet_conv_info->last_seqnum)) {
                  proto_tree_add_expert_format(tree, actx->pinfo, &ei_t38_malformed, tvb, offset, tvb_reported_length_remaining(tvb, offset),
                          "[RECEIVED END OF FRAGMENT W/OUT ANY FRAGMENT DATA]");
                  col_append_str(actx->pinfo->cinfo, COL_INFO, " [Malformed?]");
              }
              actx->pinfo->fragmented = save_fragmented;
          }
      }

      /* reset the reassemble ID and the start seq number if it is not HDLC data */
      if ( p_t38_conv && ( ((Data_Field_field_type_value >0) && (Data_Field_field_type_value <6)) || (Data_Field_field_type_value == 7) ) ){
          p_t38_conv_info->reass_ID = 0;
          p_t38_conv_info->reass_start_seqnum = -1;
          p_t38_conv_info->additional_hdlc_data_field_counter = 0;
          p_t38_conv_info->seqnum_prev_data_field = -1;

          if (p_t38_packet_conv_info->next == NULL((void*)0)) {
              p_t38_packet_conv_info->next = wmem_new(wmem_file_scope(), t38_conv_info)((t38_conv_info*)wmem_alloc((wmem_file_scope()), sizeof(t38_conv_info
)));
              p_t38_packet_conv_info = p_t38_packet_conv_info->next;
              memcpy(p_t38_packet_conv_info, p_t38_conv_info, sizeof(t38_conv_info));
          }

      }
      t38_info->Data_Field_field_type_value = Data_Field_field_type_value;
  }
return offset;
642}



646static unsigned
647dissect_t38_T_field_data(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
  tvbuff_t *value_tvb = NULL((void*)0);
  uint32_t value_len;

offset = dissect_per_octet_string(tvb, offset, actx, tree, hf_index,
                                     1, 65535, false0, &value_tvb);

  value_len = tvb_reported_length(value_tvb);


  if (primary_part){
      if(value_len < 8){
          col_append_fstr(actx->pinfo->cinfo, COL_INFO, "[%s]",
             tvb_bytes_to_str(actx->pinfo->pool, value_tvb,0,value_len));
      }
      else {
          col_append_fstr(actx->pinfo->cinfo, COL_INFO, "[%s...]",
             tvb_bytes_to_str(actx->pinfo->pool, value_tvb,0,7));
      }
  }

  if (primary_part) {
      fragment_head *frag_msg = NULL((void*)0);

      /* HDLC Data or t4-non-ecm-data */
      if (Data_Field_field_type_value == 0 || Data_Field_field_type_value == 6) { /* 0=HDLC Data or 6=t4-non-ecm-data*/
          bool_Bool save_fragmented = actx->pinfo->fragmented;

          actx->pinfo->fragmented = true1;

          /* if we have not reassembled this packet and it is the first fragment, reset the reassemble ID and the start seq number*/
          if (p_t38_packet_conv && p_t38_conv && (p_t38_packet_conv_info->reass_start_seqnum == -1)) {
              /* we use the first fragment's frame_number as fragment ID because the protocol doesn't provide it */
              /* XXX: We'd be better off assigning our own IDs using a one-up
               * counter, if it's possible for more than one reassembly to
               * begin in the same frame.
               */
                  p_t38_conv_info->reass_ID = actx->pinfo->num;
                  p_t38_conv_info->reass_start_seqnum = seq_number;
                  p_t38_conv_info->time_first_t4_data = nstime_to_sec(&actx->pinfo->rel_ts);
                  p_t38_conv_info->additional_hdlc_data_field_counter = 0;
                  p_t38_packet_conv_info->reass_ID = p_t38_conv_info->reass_ID;
                  p_t38_packet_conv_info->reass_start_seqnum = p_t38_conv_info->reass_start_seqnum;
                  p_t38_packet_conv_info->reass_start_data_field = Data_Field_item_num;
                  p_t38_packet_conv_info->seqnum_prev_data_field = p_t38_conv_info->seqnum_prev_data_field;
                  p_t38_packet_conv_info->additional_hdlc_data_field_counter = p_t38_conv_info->additional_hdlc_data_field_counter;
                  p_t38_packet_conv_info->time_first_t4_data = p_t38_conv_info->time_first_t4_data;
          }
          if (seq_number == (uint32_t)p_t38_packet_conv_info->seqnum_prev_data_field){
                 if(p_t38_conv){
                   p_t38_conv_info->additional_hdlc_data_field_counter++;
                 }
   }
          uint32_t frag_seq_num;
          if (seq_number == (uint32_t)p_t38_packet_conv_info->reass_start_seqnum) {
              frag_seq_num = (uint32_t)p_t38_packet_conv_info->additional_hdlc_data_field_counter + Data_Field_item_num - (uint32_t)p_t38_packet_conv_info->reass_start_data_field;
          } else {
              frag_seq_num = seq_number - (uint32_t)p_t38_packet_conv_info->reass_start_seqnum + (uint32_t)p_t38_packet_conv_info->additional_hdlc_data_field_counter + Data_Field_item_num;
          }
          frag_msg = fragment_add_seq(&data_reassembly_table,
              value_tvb, 0,
              actx->pinfo,
              p_t38_packet_conv_info->reass_ID, /* ID for fragments belonging together */
              NULL((void*)0),
              frag_seq_num, /* fragment sequence number */
              value_len, /* fragment length */
              true1, /* More fragments */
              0);
          p_t38_packet_conv_info->seqnum_prev_data_field = (int32_t)seq_number;
          process_reassembled_data(tvb, offset, actx->pinfo,
                      "Reassembled T38", frag_msg, &data_frag_items, NULL((void*)0), tree);

          if (!frag_msg) { /* Not last packet of reassembled */
              if (Data_Field_field_type_value == 0) {
                  col_append_fstr(actx->pinfo->cinfo, COL_INFO," (HDLC fragment %u)", frag_seq_num);
              } else {
                  col_append_fstr(actx->pinfo->cinfo, COL_INFO," (t4-data fragment %u)", seq_number - (uint32_t)p_t38_packet_conv_info->reass_start_seqnum);
              }
          }

          /* Now reset fragmentation information in pinfo */
          actx->pinfo->fragmented = save_fragmented;
      }
  }
return offset;
732}


735static const per_sequence_t Data_Field_item_sequence[] = {
{ &hf_t38_field_type      , ASN1_NO_EXTENSIONS0     , ASN1_NOT_OPTIONAL0, dissect_t38_T_field_type },
{ &hf_t38_field_data      , ASN1_NO_EXTENSIONS0     , ASN1_OPTIONAL0x04    , dissect_t38_T_field_data },
{ NULL((void*)0), 0, 0, NULL((void*)0) }
739};

741static unsigned
742dissect_t38_Data_Field_item(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
                                 ett_t38_Data_Field_item, Data_Field_item_sequence);

  if (primary_part) Data_Field_item_num++;
return offset;
748}


751static const per_sequence_t Data_Field_sequence_of[1] = {
{ &hf_t38_Data_Field_item , ASN1_NO_EXTENSIONS0     , ASN1_NOT_OPTIONAL0, dissect_t38_Data_Field_item },
753};

755static unsigned
756dissect_t38_Data_Field(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
                                    ett_t38_Data_Field, Data_Field_sequence_of);

return offset;
761}


764static const per_sequence_t IFPPacket_sequence[] = {
{ &hf_t38_type_of_msg     , ASN1_NO_EXTENSIONS0     , ASN1_NOT_OPTIONAL0, dissect_t38_Type_of_msg },
{ &hf_t38_data_field      , ASN1_NO_EXTENSIONS0     , ASN1_OPTIONAL0x04    , dissect_t38_Data_Field },
{ NULL((void*)0), 0, 0, NULL((void*)0) }
768};

770static unsigned
771dissect_t38_IFPPacket(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
                                 ett_t38_IFPPacket, IFPPacket_sequence);

return offset;
776}



780static unsigned
781dissect_t38_T_seq_number(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_constrained_integer(tvb, offset, actx, tree, hf_index,
                                                          0U, 65535U, &seq_number, false0);

  /* info for tap */
  if (primary_part)
      t38_info->seq_num = seq_number;

  col_append_fstr(actx->pinfo->cinfo, COL_INFO, "Seq=%05u ",seq_number);
return offset;
791}



795static unsigned
796dissect_t38_T_primary_ifp_packet(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
  primary_part = true1;
offset = dissect_per_open_type(tvb, offset, actx, tree, hf_index, dissect_t38_IFPPacket);

  /* if is a valid t38 packet, add to tap */
  /* Note that t4-non-ecm-sig-end without first_t4_data is not valid */
  if (p_t38_packet_conv && (!actx->pinfo->flags.in_error_pkt) && ((int32_t) seq_number != p_t38_packet_conv_info->last_seqnum) &&
      !(t38_info->type_msg == 1 && t38_info->Data_Field_field_type_value == 7 && t38_info->frame_num_first_t4_data == 0))
      tap_queue_packet(t38_tap, actx->pinfo, t38_info);

  if (p_t38_conv) p_t38_conv_info->last_seqnum = (int32_t) seq_number;
return offset;
808}



812static unsigned
813dissect_t38_OpenType_IFPPacket(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_open_type(tvb, offset, actx, tree, hf_index, dissect_t38_IFPPacket);

return offset;
817}


820static const per_sequence_t T_secondary_ifp_packets_sequence_of[1] = {
{ &hf_t38_secondary_ifp_packets_item, ASN1_NO_EXTENSIONS0     , ASN1_NOT_OPTIONAL0, dissect_t38_OpenType_IFPPacket },
822};

824static unsigned
825dissect_t38_T_secondary_ifp_packets(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
                                    ett_t38_T_secondary_ifp_packets, T_secondary_ifp_packets_sequence_of);

return offset;
830}



834static unsigned
835dissect_t38_INTEGER(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_integer(tvb, offset, actx, tree, hf_index, NULL((void*)0));

return offset;
839}



843static unsigned
844dissect_t38_OCTET_STRING(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_octet_string(tvb, offset, actx, tree, hf_index,
                                     NO_BOUND-1, NO_BOUND-1, false0, NULL((void*)0));

return offset;
849}


852static const per_sequence_t T_fec_data_sequence_of[1] = {
{ &hf_t38_fec_data_item   , ASN1_NO_EXTENSIONS0     , ASN1_NOT_OPTIONAL0, dissect_t38_OCTET_STRING },
854};

856static unsigned
857dissect_t38_T_fec_data(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_sequence_of(tvb, offset, actx, tree, hf_index,
                                    ett_t38_T_fec_data, T_fec_data_sequence_of);

return offset;
862}


865static const per_sequence_t T_fec_info_sequence[] = {
{ &hf_t38_fec_npackets    , ASN1_NO_EXTENSIONS0     , ASN1_NOT_OPTIONAL0, dissect_t38_INTEGER },
{ &hf_t38_fec_data        , ASN1_NO_EXTENSIONS0     , ASN1_NOT_OPTIONAL0, dissect_t38_T_fec_data },
{ NULL((void*)0), 0, 0, NULL((void*)0) }
869};

871static unsigned
872dissect_t38_T_fec_info(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
                                 ett_t38_T_fec_info, T_fec_info_sequence);

return offset;
877}


880static const value_string t38_T_error_recovery_vals[] = {
{   0, "secondary-ifp-packets" },
{   1, "fec-info" },
{ 0, NULL((void*)0) }
884};

886static const per_choice_t T_error_recovery_choice[] = {
{   0, &hf_t38_secondary_ifp_packets, ASN1_NO_EXTENSIONS0     , dissect_t38_T_secondary_ifp_packets },
{   1, &hf_t38_fec_info        , ASN1_NO_EXTENSIONS0     , dissect_t38_T_fec_info },
{ 0, NULL((void*)0), 0, NULL((void*)0) }
890};

892static unsigned
893dissect_t38_T_error_recovery(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
  primary_part = false0;
offset = dissect_per_choice(tvb, offset, actx, tree, hf_index,
                               ett_t38_T_error_recovery, T_error_recovery_choice,
                               NULL((void*)0));

  primary_part = true1;
return offset;
901}


904static const per_sequence_t UDPTLPacket_sequence[] = {
{ &hf_t38_seq_number      , ASN1_NO_EXTENSIONS0     , ASN1_NOT_OPTIONAL0, dissect_t38_T_seq_number },
{ &hf_t38_primary_ifp_packet, ASN1_NO_EXTENSIONS0     , ASN1_NOT_OPTIONAL0, dissect_t38_T_primary_ifp_packet },
{ &hf_t38_error_recovery  , ASN1_NO_EXTENSIONS0     , ASN1_NOT_OPTIONAL0, dissect_t38_T_error_recovery },
{ NULL((void*)0), 0, 0, NULL((void*)0) }
909};

911static unsigned
912dissect_t38_UDPTLPacket(tvbuff_t *tvb _U___attribute__((unused)), uint32_t offset _U___attribute__((unused)), asn1_ctx_t *actx _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), int hf_index _U___attribute__((unused))) {
  /* Initialize to something else than data type */
  Data_Field_field_type_value = 1;
offset = dissect_per_sequence(tvb, offset, actx, tree, hf_index,
                                 ett_t38_UDPTLPacket, UDPTLPacket_sequence);

return offset;
919}

921/*--- PDUs ---*/

923static int dissect_IFPPacket_PDU(tvbuff_t *tvb _U___attribute__((unused)), packet_info *pinfo _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), void *data _U___attribute__((unused))) {
unsigned offset = 0;
asn1_ctx_t asn1_ctx;
asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, true1, pinfo);
offset = dissect_t38_IFPPacket(tvb, offset, &asn1_ctx, tree, hf_t38_IFPPacket_PDU);
offset += 7; offset >>= 3;
return offset;
930}
931static int dissect_UDPTLPacket_PDU(tvbuff_t *tvb _U___attribute__((unused)), packet_info *pinfo _U___attribute__((unused)), proto_tree *tree _U___attribute__((unused)), void *data _U___attribute__((unused))) {
unsigned offset = 0;
asn1_ctx_t asn1_ctx;
asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, true1, pinfo);
offset = dissect_t38_UDPTLPacket(tvb, offset, &asn1_ctx, tree, hf_t38_UDPTLPacket_PDU);
offset += 7; offset >>= 3;
return offset;
938}


941/* initialize the tap t38_info and the conversation */
942static void
943init_t38_info_conv(packet_info *pinfo)
944{
/* tap info */
t38_info_current++;
if (t38_info_current==MAX_T38_MESSAGES_IN_PACKET4) {
t38_info_current=0;
}
t38_info = &t38_info_arr[t38_info_current];

t38_info->seq_num = 0;
t38_info->type_msg = 0;
t38_info->data_value = 0;
t38_info->t30ind_value =0;
t38_info->setup_frame_number = 0;
t38_info->Data_Field_field_type_value = 0;
t38_info->desc[0] = '\0';
t38_info->desc_comment[0] = '\0';
t38_info->time_first_t4_data = 0;
t38_info->frame_num_first_t4_data = 0;


/*
p_t38_packet_conv hold the conversation info in each of the packets.
p_t38_conv hold the conversation info used to reassemble the HDLC packets, and also the Setup info (e.g SDP)
If we already have p_t38_packet_conv in the packet, it means we already reassembled the HDLC packets, so we don't
need to use p_t38_conv
*/
p_t38_packet_conv = NULL((void*)0);
p_t38_conv = NULL((void*)0);

/* Use existing packet info if available */
p_t38_packet_conv = (t38_conv *)p_get_proto_data(wmem_file_scope(), pinfo, proto_t38, 0);


/* find the conversation used for Reassemble and Setup Info */
p_conv = find_conversation_strat_xtd(pinfo, pinfo->num, &pinfo->net_dst, &pinfo->net_src,
                                 conversation_pt_to_conversation_type(pinfo->ptype),
                                 pinfo->destport, pinfo->srcport, NO_ADDR_B0x00010000 | NO_PORT_B0x00020000);

/* create a conv if it doesn't exist */
if (!p_conv) {
p_conv = conversation_new_strat_xtd(pinfo, pinfo->num, &pinfo->net_src, &pinfo->net_dst,
	      conversation_pt_to_conversation_type(pinfo->ptype), pinfo->srcport, pinfo->destport, NO_ADDR20x01 | NO_PORT20x02);

/* Set dissector */
conversation_set_dissector(p_conv, t38_udp_handle);
}

p_t38_conv = (t38_conv *)conversation_get_proto_data(p_conv, proto_t38);

/* create the conversation if it doesn't exist */
if (!p_t38_conv) {
p_t38_conv = wmem_new(wmem_file_scope(), t38_conv)((t38_conv*)wmem_alloc((wmem_file_scope()), sizeof(t38_conv))
);
p_t38_conv->setup_method[0] = '\0';
p_t38_conv->setup_frame_number = 0;

p_t38_conv->src_t38_info.reass_ID = 0;
p_t38_conv->src_t38_info.reass_start_seqnum = -1;
p_t38_conv->src_t38_info.reass_start_data_field = 0;
p_t38_conv->src_t38_info.reass_data_type = 0;
p_t38_conv->src_t38_info.last_seqnum = -1;
p_t38_conv->src_t38_info.packet_lost = 0;
p_t38_conv->src_t38_info.burst_lost = 0;
p_t38_conv->src_t38_info.time_first_t4_data = 0;
p_t38_conv->src_t38_info.additional_hdlc_data_field_counter = 0;
p_t38_conv->src_t38_info.seqnum_prev_data_field = -1;
p_t38_conv->src_t38_info.next = NULL((void*)0);

p_t38_conv->dst_t38_info.reass_ID = 0;
p_t38_conv->dst_t38_info.reass_start_seqnum = -1;
p_t38_conv->dst_t38_info.reass_start_data_field = 0;
p_t38_conv->dst_t38_info.reass_data_type = 0;
p_t38_conv->dst_t38_info.last_seqnum = -1;
p_t38_conv->dst_t38_info.packet_lost = 0;
p_t38_conv->dst_t38_info.burst_lost = 0;
p_t38_conv->dst_t38_info.time_first_t4_data = 0;
p_t38_conv->dst_t38_info.additional_hdlc_data_field_counter = 0;
p_t38_conv->dst_t38_info.seqnum_prev_data_field = -1;
p_t38_conv->dst_t38_info.next = NULL((void*)0);

conversation_add_proto_data(p_conv, proto_t38, p_t38_conv);
}

if (!p_t38_packet_conv) {
/* copy the t38 conversation info to the packet t38 conversation */
p_t38_packet_conv = wmem_new(wmem_file_scope(), t38_conv)((t38_conv*)wmem_alloc((wmem_file_scope()), sizeof(t38_conv))
);
(void) g_strlcpy(p_t38_packet_conv->setup_method, p_t38_conv->setup_method, MAX_T38_SETUP_METHOD_SIZE7);
p_t38_packet_conv->setup_frame_number = p_t38_conv->setup_frame_number;

memcpy(&(p_t38_packet_conv->src_t38_info), &(p_t38_conv->src_t38_info), sizeof(t38_conv_info));
memcpy(&(p_t38_packet_conv->dst_t38_info), &(p_t38_conv->dst_t38_info), sizeof(t38_conv_info));

p_add_proto_data(wmem_file_scope(), pinfo, proto_t38, 0, p_t38_packet_conv);
}

if (addresses_equal(conversation_key_addr1(p_conv->key_ptr), &pinfo->net_src)) {
p_t38_conv_info = &(p_t38_conv->src_t38_info);
p_t38_packet_conv_info = &(p_t38_packet_conv->src_t38_info);
} else {
p_t38_conv_info = &(p_t38_conv->dst_t38_info);
p_t38_packet_conv_info = &(p_t38_packet_conv->dst_t38_info);
}

/* update t38_info */
t38_info->setup_frame_number = p_t38_packet_conv->setup_frame_number;
1048}

1050/* Entry point for dissection */
1051static int
1052dissect_t38_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U___attribute__((unused)))
1053{
uint8_t octet1;
proto_item *it;
proto_tree *tr;
uint32_t offset=0;

/*
* XXX - heuristic to check for misidentified packets.
*/
if (dissect_possible_rtpv2_packets_as_rtp){
octet1 = tvb_get_uint8(tvb, offset);
if (RTP_VERSION(octet1)((octet1) >> 6) == 2){
	return call_dissector(rtp_handle,tvb,pinfo,tree);
}
}

col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.38");
col_clear(pinfo->cinfo, COL_INFO);

primary_part = true1;

/* This indicate the item number in the primary part of the T38 message, it is used for the reassemble of T30 packets */
Data_Field_item_num = 0;

it=proto_tree_add_protocol_format(tree, proto_t38, tvb, 0, -1, "ITU-T Recommendation T.38");
tr=proto_item_add_subtree(it, ett_t38);

/* init tap and conv info */
init_t38_info_conv(pinfo);

/* Show Conversation setup info if exists*/
if (global_t38_show_setup_info) {
show_setup_info(tvb, tr, p_t38_packet_conv);
}

col_append_str(pinfo->cinfo, COL_INFO, "UDP: UDPTLPacket ");

offset = dissect_UDPTLPacket_PDU(tvb, pinfo, tr, NULL((void*)0));

if (tvb_reported_length_remaining(tvb,offset)>0){
proto_tree_add_expert_format(tr, pinfo, &ei_t38_malformed, tvb, offset, tvb_reported_length_remaining(tvb, offset),
		"[MALFORMED PACKET or wrong preference settings]");
col_append_str(pinfo->cinfo, COL_INFO, " [Malformed?]");
}
return tvb_captured_length(tvb);
1098}

1100static int
1101dissect_t38_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U___attribute__((unused)))
1102{
proto_item *it;
proto_tree *tr;
uint32_t offset=0;
      tvbuff_t *next_tvb;
uint16_t ifp_packet_number=1;

col_set_str(pinfo->cinfo, COL_PROTOCOL, "T.38");
col_clear(pinfo->cinfo, COL_INFO);

primary_part = true1;

/* This indicate the item number in the primary part of the T38 message, it is used for the reassemble of T30 packets */
Data_Field_item_num = 0;

it=proto_tree_add_protocol_format(tree, proto_t38, tvb, 0, -1, "ITU-T Recommendation T.38");
tr=proto_item_add_subtree(it, ett_t38);

/* init tap and conv info */
init_t38_info_conv(pinfo);

/* Show Conversation setup info if exists*/
if (global_t38_show_setup_info) {
show_setup_info(tvb, tr, p_t38_packet_conv);
}

col_append_str(pinfo->cinfo, COL_INFO, "TCP: IFPPacket");

while(tvb_reported_length_remaining(tvb,offset)>0)
{
next_tvb = tvb_new_subset_remaining(tvb, offset);
offset += dissect_IFPPacket_PDU(next_tvb, pinfo, tr, NULL((void*)0));
ifp_packet_number++;

if(tvb_reported_length_remaining(tvb,offset)>0){
	if(t38_tpkt_usage == T38_TPKT_ALWAYS1){
		proto_tree_add_expert_format(tr, pinfo, &ei_t38_malformed, tvb, offset, tvb_reported_length_remaining(tvb, offset),
				"[MALFORMED PACKET or wrong preference settings]");
		col_append_str(pinfo->cinfo, COL_INFO, " [Malformed?]");
		break;
	}else {
		col_append_fstr(pinfo->cinfo, COL_INFO, " IFPPacket#%u",ifp_packet_number);
	}
}
}

return tvb_captured_length(tvb);
1149}

1151static int
1152dissect_t38_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U___attribute__((unused)))
1153{
primary_part = true1;

if(t38_tpkt_usage == T38_TPKT_ALWAYS1){
dissect_tpkt_encap(tvb,pinfo,tree,t38_tpkt_reassembly,t38_tcp_pdu_handle);
}
else if((t38_tpkt_usage == T38_TPKT_NEVER0) || (is_tpkt(tvb,1, NULL((void*)0)))){
dissect_t38_tcp_pdu(tvb, pinfo, tree, data);
}
else {
dissect_tpkt_encap(tvb,pinfo,tree,t38_tpkt_reassembly,t38_tcp_pdu_handle);
}
return tvb_captured_length(tvb);
1166}

1168/* Look for conversation info and display any setup info found */
1169void
1170show_setup_info(tvbuff_t *tvb, proto_tree *tree, t38_conv *p_t38_conversation)
1171{
proto_tree *t38_setup_tree;
proto_item *ti;

if (!p_t38_conversation || p_t38_conversation->setup_frame_number == 0) {
/* there is no Setup info */
return;
}

ti =  proto_tree_add_string_format(tree, hf_t38_setup, tvb, 0, 0,
                    "",
                    "Stream setup by %s (frame %u)",
                    p_t38_conversation->setup_method,
                    p_t38_conversation->setup_frame_number);
  proto_item_set_generated(ti);
  t38_setup_tree = proto_item_add_subtree(ti, ett_t38_setup);
  if (t38_setup_tree)
  {
/* Add details into subtree */
proto_item* item = proto_tree_add_uint(t38_setup_tree, hf_t38_setup_frame,
                                                             tvb, 0, 0, p_t38_conversation->setup_frame_number);
proto_item_set_generated(item);
item = proto_tree_add_string(t38_setup_tree, hf_t38_setup_method,
                                                   tvb, 0, 0, p_t38_conversation->setup_method);
proto_item_set_generated(item);
  }
1197}

1199/* This function tries to understand if the payload is sitting on top of AC DR */
1200static bool_Bool
1201dissect_t38_acdr_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
1202{
unsigned acdr_prot = GPOINTER_TO_UINT(p_get_proto_data(pinfo->pool, pinfo, proto_acdr, 0))((guint) (gulong) (p_get_proto_data(pinfo->pool, pinfo, proto_acdr
, 0)));
if (acdr_prot == ACDR_T38)
return dissect_t38_udp(tvb, pinfo, tree, data);
return false0;
1207}


1210/* Wireshark Protocol Registration */
1211void
1212proto_register_t38(void)
1213{
static hf_register_info hf[] =
{
  { &hf_t38_IFPPacket_PDU,
    { "IFPPacket", "t38.IFPPacket_element",
      FT_NONE, BASE_NONE, NULL((void*)0), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_UDPTLPacket_PDU,
    { "UDPTLPacket", "t38.UDPTLPacket_element",
      FT_NONE, BASE_NONE, NULL((void*)0), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_type_of_msg,
    { "type-of-msg", "t38.type_of_msg",
      FT_UINT32, BASE_DEC, VALS(t38_Type_of_msg_vals)((0 ? (const struct _value_string*)0 : ((t38_Type_of_msg_vals
)))), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_data_field,
    { "data-field", "t38.data_field",
      FT_UINT32, BASE_DEC, NULL((void*)0), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_t30_indicator,
    { "t30-indicator", "t38.t30_indicator",
      FT_UINT32, BASE_DEC, VALS(t38_T30_indicator_vals)((0 ? (const struct _value_string*)0 : ((t38_T30_indicator_vals
)))), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_t30_data,
    { "t30-data", "t38.t30_data",
      FT_UINT32, BASE_DEC, VALS(t38_T30_data_vals)((0 ? (const struct _value_string*)0 : ((t38_T30_data_vals)))
), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_Data_Field_item,
    { "Data-Field item", "t38.Data_Field_item_element",
      FT_NONE, BASE_NONE, NULL((void*)0), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_field_type,
    { "field-type", "t38.field_type",
      FT_UINT32, BASE_DEC, VALS(t38_T_field_type_vals)((0 ? (const struct _value_string*)0 : ((t38_T_field_type_vals
)))), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_field_data,
    { "field-data", "t38.field_data",
      FT_BYTES, BASE_NONE, NULL((void*)0), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_seq_number,
    { "seq-number", "t38.seq_number",
      FT_UINT32, BASE_DEC, NULL((void*)0), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_primary_ifp_packet,
    { "primary-ifp-packet", "t38.primary_ifp_packet_element",
      FT_NONE, BASE_NONE, NULL((void*)0), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_error_recovery,
    { "error-recovery", "t38.error_recovery",
      FT_UINT32, BASE_DEC, VALS(t38_T_error_recovery_vals)((0 ? (const struct _value_string*)0 : ((t38_T_error_recovery_vals
)))), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_secondary_ifp_packets,
    { "secondary-ifp-packets", "t38.secondary_ifp_packets",
      FT_UINT32, BASE_DEC, NULL((void*)0), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_secondary_ifp_packets_item,
    { "secondary-ifp-packets item", "t38.secondary_ifp_packets_item_element",
      FT_NONE, BASE_NONE, NULL((void*)0), 0,
      "OpenType_IFPPacket", HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_fec_info,
    { "fec-info", "t38.fec_info_element",
      FT_NONE, BASE_NONE, NULL((void*)0), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_fec_npackets,
    { "fec-npackets", "t38.fec_npackets",
      FT_INT32, BASE_DEC, NULL((void*)0), 0,
      "INTEGER", HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_fec_data,
    { "fec-data", "t38.fec_data",
      FT_UINT32, BASE_DEC, NULL((void*)0), 0,
      NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
  { &hf_t38_fec_data_item,
    { "fec-data item", "t38.fec_data_item",
      FT_BYTES, BASE_NONE, NULL((void*)0), 0,
      "OCTET_STRING", HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
{   &hf_t38_setup,
    { "Stream setup", "t38.setup", FT_STRING, BASE_NONE,
    NULL((void*)0), 0x0, "Stream setup, method and frame number", HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
{   &hf_t38_setup_frame,
          { "Stream frame", "t38.setup-frame", FT_FRAMENUM, BASE_NONE,
          NULL((void*)0), 0x0, "Frame that set up this stream", HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
      {   &hf_t38_setup_method,
          { "Stream Method", "t38.setup-method", FT_STRING, BASE_NONE,
          NULL((void*)0), 0x0, "Method used to set up this stream", HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) }},
{&hf_t38_fragments,
	{"Message fragments", "t38.fragments",
	FT_NONE, BASE_NONE, NULL((void*)0), 0x00,	NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) } },
{&hf_t38_fragment,
	{"Message fragment", "t38.fragment",
	FT_FRAMENUM, BASE_NONE, NULL((void*)0), 0x00, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) } },
{&hf_t38_fragment_overlap,
	{"Message fragment overlap", "t38.fragment.overlap",
	FT_BOOLEAN, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) } },
{&hf_t38_fragment_overlap_conflicts,
	{"Message fragment overlapping with conflicting data",
	"t38.fragment.overlap.conflicts",
	FT_BOOLEAN, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) } },
{&hf_t38_fragment_multiple_tails,
	{"Message has multiple tail fragments",
	"t38.fragment.multiple_tails",
	FT_BOOLEAN, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) } },
{&hf_t38_fragment_too_long_fragment,
	{"Message fragment too long", "t38.fragment.too_long_fragment",
	FT_BOOLEAN, BASE_NONE, NULL((void*)0), 0x0, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) } },
{&hf_t38_fragment_error,
	{"Message defragmentation error", "t38.fragment.error",
	FT_FRAMENUM, BASE_NONE, NULL((void*)0), 0x00, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) } },
{&hf_t38_fragment_count,
	{"Message fragment count", "t38.fragment.count",
	FT_UINT32, BASE_DEC, NULL((void*)0), 0x00, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) } },
{&hf_t38_reassembled_in,
	{"Reassembled in", "t38.reassembled.in",
	FT_FRAMENUM, BASE_NONE, NULL((void*)0), 0x00, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) } },
{&hf_t38_reassembled_length,
	{"Reassembled T38 length", "t38.reassembled.length",
	FT_UINT32, BASE_DEC, NULL((void*)0), 0x00, NULL((void*)0), HFILL-1, 0, HF_REF_TYPE_NONE, -1, ((void*)0) } },
};

static int *ett[] =
{
&ett_t38,
  &ett_t38_IFPPacket,
  &ett_t38_Type_of_msg,
  &ett_t38_Data_Field,
  &ett_t38_Data_Field_item,
  &ett_t38_UDPTLPacket,
  &ett_t38_T_error_recovery,
  &ett_t38_T_secondary_ifp_packets,
  &ett_t38_T_fec_info,
  &ett_t38_T_fec_data,
&ett_t38_setup,
&ett_data_fragment,
&ett_data_fragments
};

static ei_register_info ei[] = {
{ &ei_t38_malformed, { "t38.malformed", PI_MALFORMED0x07000000, PI_ERROR0x00800000, "Malformed packet", EXPFILL0, ((void*)0), 0, ((void*)0), {0, {((void*)0), ((void*)0), FT_NONE
, BASE_NONE, ((void*)0), 0, ((void*)0), -1, 0, HF_REF_TYPE_NONE
, -1, ((void*)0)}} }},
};

module_t *t38_module;
expert_module_t* expert_t38;

proto_t38 = proto_register_protocol("T.38", "T.38", "t38");
proto_register_field_array(proto_t38, hf, array_length(hf)(sizeof (hf) / sizeof (hf)[0]));
proto_register_subtree_array(ett, array_length(ett)(sizeof (ett) / sizeof (ett)[0]));
expert_t38 = expert_register_protocol(proto_t38);
expert_register_field_array(expert_t38, ei, array_length(ei)(sizeof (ei) / sizeof (ei)[0]));
t38_udp_handle=register_dissector("t38_udp", dissect_t38_udp, proto_t38);
t38_tcp_handle=register_dissector("t38_tcp", dissect_t38_tcp, proto_t38);
t38_tcp_pdu_handle=register_dissector("t38_tcp_pdu", dissect_t38_tcp_pdu, proto_t38);

/* Register reassemble tables for HDLC */
reassembly_table_register(&data_reassembly_table,
                            &addresses_reassembly_table_functions);

t38_tap = register_tap("t38");

t38_module = prefs_register_protocol(proto_t38, NULL((void*)0));
prefs_register_bool_preference(t38_module, "use_pre_corrigendum_asn1_specification",
   "Use the Pre-Corrigendum ASN.1 specification",
   "Whether the T.38 dissector should decode using the Pre-Corrigendum T.38 "
"ASN.1 specification (1998).",
   &use_pre_corrigendum_asn1_specification);
prefs_register_bool_preference(t38_module, "dissect_possible_rtpv2_packets_as_rtp",
   "Dissect possible RTP version 2 packets with RTP dissector",
   "Whether a UDP packet that looks like RTP version 2 packet will "
"be dissected as RTP packet or T.38 packet. If enabled there is a risk that T.38 UDPTL "
"packets with sequence number higher than 32767 may be dissected as RTP.",
   &dissect_possible_rtpv2_packets_as_rtp);
prefs_register_bool_preference(t38_module, "reassembly",
"Reassemble T.38 PDUs over TPKT over TCP",
"Whether the dissector should reassemble T.38 PDUs spanning multiple TCP segments "
"when TPKT is used over TCP. "
"To use this option, you must also enable \"Allow subdissectors to reassemble "
"TCP streams\" in the TCP protocol settings.",
&t38_tpkt_reassembly);
prefs_register_enum_preference(t38_module, "tpkt_usage",
"TPKT used over TCP",
"Whether T.38 is used with TPKT for TCP",
(int *)&t38_tpkt_usage,t38_tpkt_options,false0);

prefs_register_bool_preference(t38_module, "show_setup_info",
              "Show stream setup information",
              "Where available, show which protocol and frame caused "
              "this T.38 stream to be created",
              &global_t38_show_setup_info);

register_external_value_string("t38_T30_indicator_vals", t38_T30_indicator_vals);
register_external_value_string("t38_T30_data_vals", t38_T30_data_vals);
1402}

1404void
1405proto_reg_handoff_t38(void)
1406{
rtp_handle = find_dissector_add_dependency("rtp", proto_t38);
t30_hdlc_handle = find_dissector_add_dependency("t30.hdlc", proto_t38);
proto_acdr = proto_get_id_by_filter_name("acdr");
data_handle = find_dissector("data");
dissector_add_for_decode_as("tcp.port", t38_tcp_handle);
dissector_add_for_decode_as("udp.port", t38_udp_handle);
heur_dissector_add("udp", dissect_t38_acdr_heur, "T38 over AC DR", "t38_acdr", proto_t38, HEURISTIC_DISABLE);
dissector_add_uint("acdr.media_type", ACDR_T38, t38_udp_handle);
1415}