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/* packet-pcli.c
* Routines for Packet Cable Lawful Intercept packet disassembly
*
* Packet Cable Lawful Intercept is described by various PacketCable/CableLabs
* specs.
*
* One spec is PacketCable(TM) Electronic Surveillance Specification
* PKT-SP-ESP-I01-991229, the front page of which speaks of it as
* being "Interim". It does not appear to be available from the
* CableLabs Web site, but is available through the Wayback Machine
* at
*
* http://web.archive.org/web/20030428211154/http://www.packetcable.com/downloads/specs/pkt-sp-esp-I01-991229.pdf
*
* See Section 4 "Call Content Connection Interface". In that spec, the
* packets have a 4-octet Call Content Connection (CCC) Identifier, followed
* by the Intercepted Information. The Intercepted Information is an IP
* datagram, starting with an IP header.
*
* However, later specifications, such as PacketCable(TM) 1.5 Specifications,
* Electronic Surveillance, PKT-SP-ESP1.5-I02-070412, at
*
* http://www.cablelabs.com/wp-content/uploads/specdocs/PKT-SP-ESP1.5-I02-070412.pdf
*
* the front page of which speaks of it as being "ISSUED", in Section 5 "Call
* Content Connection Interface", gives a header with a 4-octet CCC
* Identifier followed by an 8-byte NTP-format timestamp.
*
* The PacketCable(TM) 2.0, PacketCable Electronic Surveillance Delivery
* Function to Collection Function Interface Specification,
* PKT-SP-ES-DCI-C01-140314, at
*
* http://www.cablelabs.com/wp-content/uploads/specdocs/PKT-SP-ES-DCI-C01-140314.pdf
*
* which speaks of it as being "CLOSED" ("A static document, reviewed,
* tested, validated, and closed to further engineering change requests to
* the specification through CableLabs."), shows in section 7 "CALL CONTENT
* CONNECTION (CCC) INTERFACE", a header with the 4-octet CCC Identifier,
* the 8-byte NTP-format timestamp, and an 8-octet Case ID.
*
* So we may need a preference for the version.
*
* Copyright (c) 2000 by Ed Warnicke <hagbard@physics.rutgers.edu>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* Include files */
#include "config.h"
#include <epan/decode_as.h>
#include <epan/packet.h>
#include <epan/prefs.h>
void proto_register_pcli(void);
void proto_reg_handoff_pcli(void);
static dissector_handle_t pcli_handle, pcli_handle8, pcli_handle12, pcli_handle20;
/* Define the pcli proto */
static int proto_pcli;
static int proto_pcli8;
static int proto_pcli12;
static int proto_pcli20;
/* Define headers for pcli */
static int hf_pcli_cccid;
static int hf_pcli_header;
static int hf_pcli_timestamp;
static int hf_pcli_case_id;
/* Define the tree for pcli */
static int ett_pcli;
/*
* Here are the global variables associated with the preferences
* for pcli
*/
static bool pcli_summary_in_tree = true;
static dissector_table_t pcli_subdissector_table;
static proto_tree *
dissect_pcli_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int* offset)
{
uint32_t cccid;
proto_tree *pcli_tree;
proto_item *pcli_item;
/* Set the protocol column */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "PCLI");
/*
*If we have a non-null tree (ie we are building the proto_tree
* instead of just filling out the columns ), then add a PLCI
* tree node and put a CCCID header element under it.
*/
pcli_item = proto_tree_add_item(tree, proto_pcli, tvb, *offset, 4, ENC_NA);
pcli_tree = proto_item_add_subtree(pcli_item, ett_pcli);
proto_tree_add_item_ret_uint(pcli_tree, hf_pcli_cccid, tvb, *offset, 4, ENC_BIG_ENDIAN, &cccid);
(*offset) += 4;
if (pcli_summary_in_tree) {
proto_item_append_text(pcli_item, ", CCCID: %u", cccid);
}
/* Set the info column */
col_add_fstr(pinfo->cinfo, COL_INFO, "CCCID: %u", cccid);
return pcli_tree;
}
static void
dissect_pcli_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset)
{
tvbuff_t * next_tvb;
next_tvb = tvb_new_subset_remaining(tvb, offset);
if (!dissector_try_payload(pcli_subdissector_table, next_tvb, pinfo, tree)) {
call_data_dissector(next_tvb, pinfo, tree);
}
}
static int
dissect_pcli(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int offset = 0;
dissect_pcli_common(tvb, pinfo, tree, &offset);
dissect_pcli_payload(tvb, pinfo, tree, offset);
return tvb_captured_length(tvb);
}
static int
dissect_pcli8(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *pcli_tree;
int offset = 0;
pcli_tree = dissect_pcli_common(tvb, pinfo, tree, &offset);
proto_tree_add_item(pcli_tree, hf_pcli_header, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
dissect_pcli_payload(tvb, pinfo, tree, offset);
return tvb_captured_length(tvb);
}
static int
dissect_pcli12(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *pcli_tree;
int offset = 0;
pcli_tree = dissect_pcli_common(tvb, pinfo, tree, &offset);
proto_tree_add_item(pcli_tree, hf_pcli_timestamp, tvb, offset, 8, ENC_TIME_NTP|ENC_BIG_ENDIAN);
offset += 8;
dissect_pcli_payload(tvb, pinfo, tree, offset);
return tvb_captured_length(tvb);
}
static int
dissect_pcli20(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *pcli_tree;
int offset = 0;
pcli_tree = dissect_pcli_common(tvb, pinfo, tree, &offset);
proto_tree_add_item(pcli_tree, hf_pcli_timestamp, tvb, offset, 8, ENC_TIME_NTP|ENC_BIG_ENDIAN);
offset += 8;
proto_tree_add_item(pcli_tree, hf_pcli_case_id, tvb, offset, 8, ENC_BIG_ENDIAN);
offset += 8;
dissect_pcli_payload(tvb, pinfo, tree, offset);
return tvb_captured_length(tvb);
}
static void
pcli_prompt(packet_info *pinfo _U_, char* result)
{
snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "PCLI payload as");
}
void
proto_register_pcli(void)
{
static hf_register_info hf[] = {
{ &hf_pcli_cccid,
{ "CCCID", "pcli.cccid", FT_UINT32, BASE_DEC, NULL, 0x0,
"Call Content Connection Identifier", HFILL }},
{ &hf_pcli_header,
{ "CCCID", "pcli.header", FT_UINT32, BASE_HEX, NULL, 0x0,
"Part of 8 byte header (including CCCID?)", HFILL }},
{ &hf_pcli_timestamp,
{ "Timestamp", "pcli.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL, 0x0,
NULL, HFILL }},
{ &hf_pcli_case_id,
{ "Case ID", "pcli.case_id", FT_UINT64, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
};
static int *ett[] = {
&ett_pcli,
};
module_t *pcli_module;
proto_pcli = proto_register_protocol("Packet Cable Lawful Intercept", "PCLI", "pcli");
/* Create "placeholders" to remove confusion with Decode As" */
proto_pcli8 = proto_register_protocol_in_name_only("Packet Cable Lawful Intercept (8 byte CCCID)", "PCLI8 (8 byte CCCID)", "pcli8", proto_pcli, FT_PROTOCOL);
proto_pcli12 = proto_register_protocol_in_name_only("Packet Cable Lawful Intercept (timestamp)", "PCLI12 (timestamp)", "pcli12", proto_pcli, FT_PROTOCOL);
proto_pcli20 = proto_register_protocol_in_name_only("Packet Cable Lawful Intercept (timestamp, case ID)", "PCLI20 (timestamp, case ID)", "pcli20", proto_pcli, FT_PROTOCOL);
proto_register_field_array(proto_pcli,hf,array_length(hf));
proto_register_subtree_array(ett,array_length(ett));
pcli_module = prefs_register_protocol(proto_pcli, NULL);
prefs_register_obsolete_preference(pcli_module, "udp_port");
prefs_register_bool_preference(pcli_module, "summary_in_tree",
"Show PCLI summary in protocol tree",
"Whether the PCLI summary line should be shown in the protocol tree",
&pcli_summary_in_tree);
pcli_subdissector_table = register_decode_as_next_proto(proto_pcli, "pcli.payload",
"PCLI payload dissector", pcli_prompt);
/* Register the dissector handles */
pcli_handle = register_dissector("pcli", dissect_pcli, proto_pcli);
pcli_handle8 = register_dissector("pcli8", dissect_pcli8, proto_pcli8);
pcli_handle12 = register_dissector("pcli12", dissect_pcli12, proto_pcli12);
pcli_handle20 = register_dissector("pcli20", dissect_pcli20, proto_pcli20);
}
/* The registration hand-off routing */
void
proto_reg_handoff_pcli(void)
{
dissector_add_for_decode_as_with_preference("udp.port", pcli_handle);
dissector_add_for_decode_as_with_preference("udp.port", pcli_handle8);
dissector_add_for_decode_as_with_preference("udp.port", pcli_handle12);
dissector_add_for_decode_as_with_preference("udp.port", pcli_handle20);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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