forked from osmocom/wireshark
433 lines
16 KiB
C
433 lines
16 KiB
C
/* packet-catapult-dct2000.c
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* Routines for Catapult DCT2000 packet stub header disassembly
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <string.h>
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#include <epan/packet.h>
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#include <epan/emem.h>
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#include <epan/proto.h>
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#include <epan/prefs.h>
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#include "../wiretap/catapult_dct2000.h"
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/* Protocol and registered fields. */
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static int proto_catapult_dct2000 = -1;
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static int hf_catapult_dct2000_context = -1;
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static int hf_catapult_dct2000_port_number = -1;
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static int hf_catapult_dct2000_timestamp = -1;
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static int hf_catapult_dct2000_protocol = -1;
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static int hf_catapult_dct2000_variant = -1;
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static int hf_catapult_dct2000_direction = -1;
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static int hf_catapult_dct2000_encap = -1;
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static int hf_catapult_dct2000_unparsed_data = -1;
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/* Variables used for preferences */
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gboolean catapult_dct2000_board_ports_only;
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gboolean catapult_dct2000_try_ipprim_heuristic = TRUE;
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/* Protocol subtree. */
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static int ett_catapult_dct2000 = -1;
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static const value_string direction_vals[] = {
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{ 0, "Sent" },
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{ 1, "Received" },
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{ 0, NULL },
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};
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static const value_string encap_vals[] = {
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{ WTAP_ENCAP_RAW_IP, "Raw IP" },
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{ WTAP_ENCAP_ETHERNET, "Ethernet" },
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{ WTAP_ENCAP_ISDN, "LAPD" },
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{ WTAP_ENCAP_ATM_PDUS_UNTRUNCATED, "ATM (PDUs untruncated)" },
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{ WTAP_ENCAP_PPP, "PPP" },
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{ DCT2000_ENCAP_SSCOP, "SSCOP" },
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{ WTAP_ENCAP_FRELAY, "Frame Relay" },
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{ WTAP_ENCAP_MTP2, "MTP2" },
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{ DCT2000_ENCAP_UNHANDLED, "Unhandled Protocol" },
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{ 0, NULL },
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};
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/* Look for the protocol data within an ipprim packet.
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Only set *data_offset if data field found. */
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gboolean find_ipprim_data_offset(tvbuff_t *tvb, int *data_offset)
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{
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guint8 length;
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int offset = *data_offset;
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gboolean is_udp;
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/* Get the ipprim command code. */
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guint8 tag = tvb_get_guint8(tvb, offset++);
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/* Only accept UDP or TCP data request or indication */
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switch (tag)
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{
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case 0x23: /* UDP data request */
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case 0x24: /* UDP data indication */
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is_udp = TRUE;
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break;
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case 0x45: /* TCP data request */
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case 0x46: /* TCP data indication */
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is_udp = FALSE;
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break;
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default:
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return FALSE;
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}
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/* Skip any other TLC fields before reach payload */
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while (tvb_length_remaining(tvb, offset) > 2)
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{
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/* Look at next tag */
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tag = tvb_get_guint8(tvb, offset++);
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/* Is this the data payload we're expecting? */
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if ((tag == 0x34 && is_udp) || (tag == 0x48 && !is_udp))
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{
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*data_offset = offset;
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return TRUE;
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}
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else
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{
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/* Read length in next byte */
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length = tvb_get_guint8(tvb, offset++);
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/* Skip the following value */
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offset += length;
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}
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}
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/* No data found... */
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return FALSE;
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}
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/*****************************************/
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/* Main dissection function. */
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/*****************************************/
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static void
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dissect_catapult_dct2000(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *dct2000_tree;
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proto_item *ti;
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gint offset = 0;
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gint context_length;
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guint8 port_number;
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guint8 variant;
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gint protocol_start;
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gint protocol_length;
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gint timestamp_start;
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gint timestamp_length;
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guint8 direction;
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tvbuff_t *next_tvb;
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int encap;
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dissector_handle_t protocol_handle = 0;
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dissector_handle_t heur_ipprim_protocol_handle = 0;
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int sub_dissector_result = 0;
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/* Protocol name */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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{
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col_add_str(pinfo->cinfo, COL_PROTOCOL, "DCT2000");
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}
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/* Info column */
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if (check_col(pinfo->cinfo, COL_INFO))
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{
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col_clear(pinfo->cinfo, COL_INFO);
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}
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/* Create protocol tree. */
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ti = proto_tree_add_item(tree, proto_catapult_dct2000, tvb, offset, -1, FALSE);
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dct2000_tree = proto_item_add_subtree(ti, ett_catapult_dct2000);
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/* Context Name */
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context_length = tvb_strsize(tvb, offset);
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proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_context, tvb,
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offset, context_length, FALSE);
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offset += context_length;
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/* Context port number */
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proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_port_number, tvb,
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offset, 1, FALSE);
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port_number = tvb_get_guint8(tvb, offset);
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offset++;
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/* Timestamp in file */
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timestamp_start = offset;
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timestamp_length = tvb_strsize(tvb, offset);
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proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_timestamp, tvb,
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offset, timestamp_length, FALSE);
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offset += timestamp_length;
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/* Original protocol name */
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protocol_start = offset;
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protocol_length = tvb_strsize(tvb, offset);
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proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_protocol, tvb,
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offset, protocol_length, FALSE);
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offset += protocol_length;
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/* Variant */
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variant = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_variant, tvb,
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offset, 1, FALSE);
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offset++;
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/* Direction */
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direction = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_direction, tvb,
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offset, 1, FALSE);
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offset++;
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/* Read file encap */
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proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_encap, tvb, offset, 1, FALSE);
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encap = tvb_get_guint8(tvb, offset);
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offset++;
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/* Set selection length of dct2000 tree */
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proto_item_set_len(dct2000_tree, offset);
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/* Add useful details to protocol tree label */
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proto_item_append_text(ti, " context=%s.%u t=%s %c prot=%s (v=%d)",
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tvb_get_ephemeral_string(tvb, 0, context_length),
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port_number,
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tvb_get_ephemeral_string(tvb, timestamp_start, timestamp_length),
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(direction == 0) ? 'S' : 'R',
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tvb_get_ephemeral_string(tvb, protocol_start, protocol_length),
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variant);
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/* Note that the first item of pinfo->pseudo_header->dct2000 will contain
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the pseudo-header needed (in some cases) by the wireshark dissector */
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/***********************************************************************/
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/* Now hand off to the dissector of intended packet encapsulation type */
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/* Get protocol handle, and set p2p_dir where necessary.
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(packet-frame.c won't copy it from pseudo-header because it doesn't
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know about Catapult DCT2000 encap type...)
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*/
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switch (encap)
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{
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case WTAP_ENCAP_RAW_IP:
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protocol_handle = find_dissector("ip");
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break;
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case WTAP_ENCAP_ETHERNET:
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protocol_handle = find_dissector("eth_withoutfcs");
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break;
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case WTAP_ENCAP_ISDN:
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protocol_handle = find_dissector("lapd");
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pinfo->p2p_dir = pinfo->pseudo_header->isdn.uton;
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break;
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case WTAP_ENCAP_ATM_PDUS_UNTRUNCATED:
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protocol_handle = find_dissector("atm_untruncated");
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break;
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case WTAP_ENCAP_PPP:
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protocol_handle = find_dissector("ppp_hdlc");
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pinfo->p2p_dir = pinfo->pseudo_header->p2p.sent;
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break;
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case DCT2000_ENCAP_SSCOP:
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protocol_handle = find_dissector("sscop");
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break;
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case WTAP_ENCAP_FRELAY:
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protocol_handle = find_dissector("fr");
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break;
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case DCT2000_ENCAP_MTP2:
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protocol_handle = find_dissector("mtp2");
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break;
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case DCT2000_ENCAP_UNHANDLED:
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/* Many DCT2000 protocols have at least one IPPrim variant. If the
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protocol names match, try to find the UDP/TCP data inside them and
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pass that offset to dissector
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*/
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protocol_handle = 0;
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/* Try IP Prim heuristic if configured to */
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if (catapult_dct2000_try_ipprim_heuristic)
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{
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heur_ipprim_protocol_handle =
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find_dissector(tvb_get_ephemeral_string(tvb, protocol_start,
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protocol_length));
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if ((heur_ipprim_protocol_handle != 0) &&
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find_ipprim_data_offset(tvb, &offset))
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{
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protocol_handle = heur_ipprim_protocol_handle;
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}
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}
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break;
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default:
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/* !! If get here, there is a mismatch between
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this dissector and the wiretap module catapult_dct2000.c !!
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*/
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DISSECTOR_ASSERT_NOT_REACHED();
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return;
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}
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/* Try appropriate dissector, if selected */
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if (protocol_handle != 0)
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{
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/* Dissect the remainder of the frame using chosen protocol handle */
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next_tvb = tvb_new_subset(tvb, offset, -1, tvb_reported_length(tvb)-offset);
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sub_dissector_result = call_dissector_only(protocol_handle, next_tvb, pinfo, tree);
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}
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if (protocol_handle == 0 || sub_dissector_result == 0)
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{
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/* Could get here because:
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- encap is DCT2000_ENCAP_UNHANDLED, OR
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- desired protocol is unavailable (probably disabled), OR
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- protocol rejected our data
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Show remaining bytes as unparsed data */
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proto_tree_add_item(dct2000_tree, hf_catapult_dct2000_unparsed_data,
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tvb, offset, -1, FALSE);
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if (check_col(pinfo->cinfo, COL_INFO))
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{
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"Unparsed protocol data (context=%s.%u t=%s %c prot=%s (v=%d))",
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tvb_get_ephemeral_string(tvb, 0, context_length),
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port_number,
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tvb_get_ephemeral_string(tvb, timestamp_start, timestamp_length),
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(direction == 0) ? 'S' : 'R',
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tvb_get_ephemeral_string(tvb, protocol_start, protocol_length),
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variant);
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}
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}
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}
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/******************************************************************************/
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/* Associate this protocol with the Catapult DCT2000 file encapsulation type. */
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/******************************************************************************/
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void proto_reg_handoff_catapult_dct2000(void)
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{
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dissector_handle_t catapult_dct2000_handle = find_dissector("dct2000");
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dissector_add("wtap_encap", WTAP_ENCAP_CATAPULT_DCT2000,
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catapult_dct2000_handle);
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}
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/****************************************/
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/* Register the protocol */
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/****************************************/
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void proto_register_catapult_dct2000(void)
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{
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static hf_register_info hf[] =
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{
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{ &hf_catapult_dct2000_context,
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{ "Context",
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"dct2000.context", FT_STRING, BASE_NONE, NULL, 0x0,
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"Context name", HFILL
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}
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},
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{ &hf_catapult_dct2000_port_number,
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{ "Context Port number",
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"dct2000.context_port", FT_UINT8, BASE_DEC, NULL, 0x0,
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"Context port number", HFILL
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}
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},
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{ &hf_catapult_dct2000_timestamp,
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{ "Timestamp",
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"dct2000.timestamp", FT_STRING, BASE_NONE, NULL, 0x0,
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"File timestamp", HFILL
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}
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},
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{ &hf_catapult_dct2000_protocol,
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{ "DCT2000 protocol",
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"dct2000.protocol", FT_STRING, BASE_NONE, NULL, 0x0,
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"Original (DCT2000) protocol name", HFILL
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}
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},
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{ &hf_catapult_dct2000_variant,
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{ "Protocol variant",
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"dct2000.variant", FT_UINT8, BASE_DEC, NULL, 0x0,
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"DCT2000 protocol variant", HFILL
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}
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},
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{ &hf_catapult_dct2000_direction,
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{ "Direction",
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"dct2000.direction", FT_UINT8, BASE_DEC, VALS(direction_vals), 0x0,
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"Frame direction (Sent or Received)", HFILL
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}
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},
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{ &hf_catapult_dct2000_encap,
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{ "Wireshark encapsulation",
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"dct2000.encapsulation", FT_UINT8, BASE_DEC, VALS(encap_vals), 0x0,
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"Wireshark encapsulation used", HFILL
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}
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},
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{ &hf_catapult_dct2000_unparsed_data,
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{ "Unparsed protocol data",
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"dct2000.unparsed_data", FT_BYTES, BASE_NONE, NULL, 0x0,
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"Unparsed DCT2000 protocol data", HFILL
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}
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},
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};
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static gint *ett[] =
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{
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&ett_catapult_dct2000
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};
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module_t *catapult_dct2000_module;
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/* Register protocol. */
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proto_catapult_dct2000 = proto_register_protocol("DCT2000", "DCT2000", "dct2000");
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proto_register_field_array(proto_catapult_dct2000, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Allow dissector to find be found by name. */
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register_dissector("dct2000", dissect_catapult_dct2000, proto_catapult_dct2000);
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/* Preferences */
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catapult_dct2000_module = prefs_register_protocol(proto_catapult_dct2000,
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proto_reg_handoff_catapult_dct2000);
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/* Determines whether non-supported protocols should be shown anyway */
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prefs_register_bool_preference(catapult_dct2000_module, "board_ports_only",
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"Only show known 'board-port' protocols",
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"Don't show other protocols, i.e. unknown board-port "
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"protocols and non-standard primitives between "
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"contexts on the same card. The capture file "
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"needs to be (re)-loaded before effect will be seen",
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&catapult_dct2000_board_ports_only);
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/* Determines whether for not-handled protocols we should try to parse it if:
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- it looks like its embedded in an ipprim message, AND
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- the DCT2000 protocol name matches an wireshark dissector name */
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prefs_register_bool_preference(catapult_dct2000_module, "ipprim_heuristic",
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"Use IP Primitive heuristic",
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"If a payload looks like its embedded in an "
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"IP primitive messages, and there is an wireshark "
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"dissector matching the DCT2000 protocol name, "
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"try parsing the payload using that dissector",
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&catapult_dct2000_try_ipprim_heuristic);
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}
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