forked from osmocom/wireshark
270 lines
8.8 KiB
C
270 lines
8.8 KiB
C
/* packet-pcli.c
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* Routines for Packet Cable Lawful Intercept packet disassembly
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*
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* Packet Cable Lawful Intercept is described by various PacketCable/CableLabs
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* specs.
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*
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* One spec is PacketCable(TM) Electronic Surveillance Specification
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* PKT-SP-ESP-I01-991229, the front page of which speaks of it as
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* being "Interim". It does not appear to be available from the
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* CableLabs Web site, but is available through the Wayback Machine
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* at
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*
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* http://web.archive.org/web/20030428211154/http://www.packetcable.com/downloads/specs/pkt-sp-esp-I01-991229.pdf
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*
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* See Section 4 "Call Content Connection Interface". In that spec, the
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* packets have a 4-octet Call Content Connection (CCC) Identifier, followed
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* by the Intercepted Information. The Intercepted Information is an IP
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* datagram, starting with an IP header.
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*
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* However, later specifications, such as PacketCable(TM) 1.5 Specifications,
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* Electronic Surveillance, PKT-SP-ESP1.5-I02-070412, at
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*
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* http://www.cablelabs.com/wp-content/uploads/specdocs/PKT-SP-ESP1.5-I02-070412.pdf
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*
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* the front page of which speaks of it as being "ISSUED", in Section 5 "Call
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* Content Connection Interface", gives a header with a 4-octet CCC
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* Identifier followed by an 8-byte NTP-format timestamp.
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*
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* The PacketCable(TM) 2.0, PacketCable Electronic Surveillance Delivery
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* Function to Collection Function Interface Specification,
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* PKT-SP-ES-DCI-C01-140314, at
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*
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* http://www.cablelabs.com/wp-content/uploads/specdocs/PKT-SP-ES-DCI-C01-140314.pdf
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*
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* which speaks of it as being "CLOSED" ("A static document, reviewed,
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* tested, validated, and closed to further engineering change requests to
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* the specification through CableLabs."), shows in section 7 "CALL CONTENT
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* CONNECTION (CCC) INTERFACE", a header with the 4-octet CCC Identifier,
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* the 8-byte NTP-format timestamp, and an 8-octet Case ID.
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*
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* So we may need a preference for the version.
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*
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* Copyright (c) 2000 by Ed Warnicke <hagbard@physics.rutgers.edu>
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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 1999 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/* Include files */
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#include "config.h"
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#include <epan/decode_as.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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void proto_register_pcli(void);
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void proto_reg_handoff_pcli(void);
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/* Define the pcli proto */
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static int proto_pcli = -1;
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static int proto_pcli8 = -1;
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static int proto_pcli12 = -1;
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static int proto_pcli20 = -1;
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/* Define headers for pcli */
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static int hf_pcli_cccid = -1;
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static int hf_pcli_header = -1;
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static int hf_pcli_timestamp = -1;
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static int hf_pcli_case_id = -1;
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/* Define the tree for pcli */
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static int ett_pcli = -1;
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/*
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* Here are the global variables associated with the preferences
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* for pcli
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*/
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static gboolean pcli_summary_in_tree = TRUE;
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static dissector_table_t pcli_subdissector_table;
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static proto_tree *
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dissect_pcli_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int* offset)
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{
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guint32 cccid;
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proto_tree *pcli_tree;
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proto_item *pcli_item;
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/* Set the protocol column */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "PCLI");
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/*
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*If we have a non-null tree (ie we are building the proto_tree
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* instead of just filling out the columns ), then add a PLCI
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* tree node and put a CCCID header element under it.
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*/
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pcli_item = proto_tree_add_item(tree, proto_pcli, tvb, *offset, 4, ENC_NA);
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pcli_tree = proto_item_add_subtree(pcli_item, ett_pcli);
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proto_tree_add_item_ret_uint(pcli_tree, hf_pcli_cccid, tvb, *offset, 4, ENC_BIG_ENDIAN, &cccid);
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(*offset) += 4;
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if (pcli_summary_in_tree) {
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proto_item_append_text(pcli_item, ", CCCID: %u", cccid);
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}
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/* Set the info column */
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col_add_fstr(pinfo->cinfo, COL_INFO, "CCCID: %u", cccid);
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return pcli_tree;
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}
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static void
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dissect_pcli_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset)
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{
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tvbuff_t * next_tvb;
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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if (!dissector_try_payload(pcli_subdissector_table, next_tvb, pinfo, tree)) {
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call_data_dissector(next_tvb, pinfo, tree);
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}
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}
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static int
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dissect_pcli(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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int offset = 0;
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dissect_pcli_common(tvb, pinfo, tree, &offset);
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dissect_pcli_payload(tvb, pinfo, tree, offset);
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return tvb_captured_length(tvb);
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}
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static int
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dissect_pcli8(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *pcli_tree;
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int offset = 0;
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pcli_tree = dissect_pcli_common(tvb, pinfo, tree, &offset);
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proto_tree_add_item(pcli_tree, hf_pcli_header, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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dissect_pcli_payload(tvb, pinfo, tree, offset);
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return tvb_captured_length(tvb);
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}
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static int
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dissect_pcli12(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *pcli_tree;
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int offset = 0;
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pcli_tree = dissect_pcli_common(tvb, pinfo, tree, &offset);
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proto_tree_add_item(pcli_tree, hf_pcli_timestamp, tvb, offset, 8, ENC_TIME_NTP|ENC_BIG_ENDIAN);
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offset += 8;
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dissect_pcli_payload(tvb, pinfo, tree, offset);
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return tvb_captured_length(tvb);
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}
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static int
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dissect_pcli20(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *pcli_tree;
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int offset = 0;
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pcli_tree = dissect_pcli_common(tvb, pinfo, tree, &offset);
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proto_tree_add_item(pcli_tree, hf_pcli_timestamp, tvb, offset, 8, ENC_TIME_NTP|ENC_BIG_ENDIAN);
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offset += 8;
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proto_tree_add_item(pcli_tree, hf_pcli_case_id, tvb, offset, 8, ENC_BIG_ENDIAN);
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offset += 8;
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dissect_pcli_payload(tvb, pinfo, tree, offset);
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return tvb_captured_length(tvb);
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}
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static void
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pcli_prompt(packet_info *pinfo _U_, gchar* result)
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{
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snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "PCLI payload as");
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}
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void
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proto_register_pcli(void)
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{
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static hf_register_info hf[] = {
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{ &hf_pcli_cccid,
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{ "CCCID", "pcli.cccid", FT_UINT32, BASE_DEC, NULL, 0x0,
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"Call Content Connection Identifier", HFILL }},
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{ &hf_pcli_header,
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{ "CCCID", "pcli.header", FT_UINT32, BASE_HEX, NULL, 0x0,
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"Part of 8 byte header (including CCCID?)", HFILL }},
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{ &hf_pcli_timestamp,
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{ "Timestamp", "pcli.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pcli_case_id,
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{ "Case ID", "pcli.case_id", FT_UINT64, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_pcli,
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};
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module_t *pcli_module;
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proto_pcli = proto_register_protocol("Packet Cable Lawful Intercept", "PCLI", "pcli");
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/* Create "placeholders" to remove confusion with Decode As" */
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proto_pcli8 = proto_register_protocol_in_name_only("Packet Cable Lawful Intercept (8 byte CCCID)", "PCLI8 (8 byte CCCID)", "pcli8", proto_pcli, FT_PROTOCOL);
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proto_pcli12 = proto_register_protocol_in_name_only("Packet Cable Lawful Intercept (timestamp)", "PCLI12 (timestamp)", "pcli12", proto_pcli, FT_PROTOCOL);
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proto_pcli20 = proto_register_protocol_in_name_only("Packet Cable Lawful Intercept (timestamp, case ID)", "PCLI20 (timestamp, case ID)", "pcli20", proto_pcli, FT_PROTOCOL);
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proto_register_field_array(proto_pcli,hf,array_length(hf));
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proto_register_subtree_array(ett,array_length(ett));
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pcli_module = prefs_register_protocol(proto_pcli, NULL);
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prefs_register_obsolete_preference(pcli_module, "udp_port");
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prefs_register_bool_preference(pcli_module, "summary_in_tree",
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"Show PCLI summary in protocol tree",
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"Whether the PCLI summary line should be shown in the protocol tree",
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&pcli_summary_in_tree);
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pcli_subdissector_table = register_decode_as_next_proto(proto_pcli, "pcli.payload",
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"PCLI payload dissector", pcli_prompt);
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}
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/* The registration hand-off routing */
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void
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proto_reg_handoff_pcli(void)
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{
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dissector_handle_t pcli_handle, pcli_handle8, pcli_handle12, pcli_handle20;
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pcli_handle = create_dissector_handle(dissect_pcli, proto_pcli);
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pcli_handle8 = create_dissector_handle(dissect_pcli8, proto_pcli8);
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pcli_handle12 = create_dissector_handle(dissect_pcli12, proto_pcli12);
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pcli_handle20 = create_dissector_handle(dissect_pcli20, proto_pcli20);
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dissector_add_for_decode_as_with_preference("udp.port", pcli_handle);
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dissector_add_for_decode_as_with_preference("udp.port", pcli_handle8);
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dissector_add_for_decode_as_with_preference("udp.port", pcli_handle12);
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dissector_add_for_decode_as_with_preference("udp.port", pcli_handle20);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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