/* 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 * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1999 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /* Include files */ #include "config.h" #include #include #include void proto_register_pcli(void); void proto_reg_handoff_pcli(void); /* Define the pcli proto */ static int proto_pcli = -1; static int proto_pcli8 = -1; static int proto_pcli12 = -1; static int proto_pcli20 = -1; /* Define headers for pcli */ static int hf_pcli_cccid = -1; static int hf_pcli_header = -1; static int hf_pcli_timestamp = -1; static int hf_pcli_case_id = -1; /* Define the tree for pcli */ static int ett_pcli = -1; /* * Here are the global variables associated with the preferences * for pcli */ static gboolean 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) { guint32 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); /* * Implement "Decode As", as PCLI doesn't * have a unique identifier to determine subdissector */ if (!dissector_try_uint(pcli_subdissector_table, 0, 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_, gchar* result) { g_snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "PCLI payload as"); } static gpointer pcli_value(packet_info *pinfo _U_) { return NULL; } 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 gint *ett[] = { &ett_pcli, }; module_t *pcli_module; /* Decode As handling */ static build_valid_func pcli_payload_da_build_value[1] = {pcli_value}; static decode_as_value_t pcli_payload_da_values = {pcli_prompt, 1, pcli_payload_da_build_value}; static decode_as_t pcli_payload_da = { "pcli", "PCLI payload", "pcli.payload", 1, 0, &pcli_payload_da_values, NULL, NULL, decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL, }; proto_pcli = proto_register_protocol("Packet Cable Lawful Intercept", "PCLI", "pcli"); /* Create "placeholders" to remove confusion with Decode As" */ proto_pcli8 = proto_register_protocol("Packet Cable Lawful Intercept (8 byte CCCID)", "PCLI8 (8 byte CCCID)", "pcli8"); proto_pcli12 = proto_register_protocol("Packet Cable Lawful Intercept (timestamp)", "PCLI12 (timestamp)", "pcli12"); proto_pcli20 = proto_register_protocol("Packet Cable Lawful Intercept (timestamp, case ID)", "PCLI20 (timestamp, case ID)", "pcli20"); 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_dissector_table( "pcli.payload", "PCLI payload dissector", proto_pcli, FT_UINT32, BASE_DEC); register_decode_as(&pcli_payload_da); } /* The registration hand-off routing */ void proto_reg_handoff_pcli(void) { dissector_handle_t pcli_handle, pcli_handle8, pcli_handle12, pcli_handle20; pcli_handle = create_dissector_handle(dissect_pcli, proto_pcli); pcli_handle8 = create_dissector_handle(dissect_pcli8, proto_pcli8); pcli_handle12 = create_dissector_handle(dissect_pcli12, proto_pcli12); pcli_handle20 = create_dissector_handle(dissect_pcli20, proto_pcli20); 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 - http://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: */