forked from osmocom/wireshark
AndersBroman
parent
3e92ca0147
commit
3be3b2cc95
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@ -101,6 +101,7 @@ set(CLEAN_ASN1_DISSECTOR_SRC
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${CMAKE_CURRENT_SOURCE_DIR}/packet-goose.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-gsm_map.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-HI2Operations.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-h224.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-h225.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-h235.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-h245.c
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@ -0,0 +1,241 @@
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/* packet-h224.c
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* Routines for H224 dissection
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* Copyright 2022, Anders Broman <anders.broman@ericsson.com>
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/*
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RFC description H.224 in SDP: RFC4573 https://www.rfc-editor.org/rfc/rfc4573.html
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H.281 - FECC protocol H.281 https://www.itu.int/rec/T-REC-H.281/en
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H.224 - transport encapsulation for FECC H.224 https://www.itu.int/rec/T-REC-H.224-200501-I/en
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H.323 Annex Q - packing description H.224 in RTP H.323 https://www.itu.int/rec/T-REC-H.323-202203-I
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*/
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#include <config.h>
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#include <epan/packet.h>
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//#include <epan/expert.h>
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//#include <epan/prefs.h>
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/* Prototypes */
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void proto_reg_handoff_h224(void);
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void proto_register_h224(void);
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/* Initialize the protocol and registered fields */
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static int proto_h224 = -1;
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static int hf_h224_dta = -1;
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static int hf_h224_sta = -1;
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static int hf_h224_reserved = -1;
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static int hf_h224_standard_client_id = -1;
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static int hf_h224_extended_client_id = -1;
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static int hf_h224_client_id_country = -1;
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static int hf_h224_client_id_manufacturer = -1;
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static int hf_h224_es_b7 = -1;
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static int hf_h224_bs_b6 = -1;
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static int hf_h224_c1_b5 = -1;
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static int hf_h224_c2_b4 = -1;
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static int hf_h224_seg_b3b0 = -1;
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static int hf_h224_client_data = -1;
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//static expert_field ei_h224_EXPERTABBREV = EI_INIT;
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static dissector_handle_t h224_handle;
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/* Initialize the subtree pointers */
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static gint ett_h224 = -1;
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/* Code to actually dissect the packets */
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static int
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dissect_h224(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree, void* data _U_)
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{
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proto_item* ti;
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proto_tree* h224_tree;
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guint offset = 0;
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guint8 oct;
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/* Set the Protocol column to the constant string of h224 */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "h224");
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ti = proto_tree_add_item(tree, proto_h224, tvb, offset, -1, ENC_NA);
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h224_tree = proto_item_add_subtree(ti, ett_h224);
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/* On IP transport networks, the H.224 protocol octet structure shall be the same as Figure 2/H.224
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* except that the HDLC bit stuffing, HDLC flags and HDLC Frame Check Sequence shall be omitted.
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*/
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/* Destination terminal address 2 octets */
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proto_tree_add_item(h224_tree, hf_h224_dta, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(h224_tree, hf_h224_sta, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(h224_tree, hf_h224_reserved, tvb, offset, 1, ENC_NA);
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/*
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* CLIENT ID: The client to receive the contents of the datagram. The Client ID may be any
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* of the following formats:
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* - Standard Client ID – Single octet.
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* - Extended Client ID – Two octets (0x7E, extended Client ID).
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* - Non-standard Client ID – Six octets (0x7F, country, manufacturer code, ID)
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*/
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oct = tvb_get_guint8(tvb, offset);
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if (oct == 0x7e) {
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proto_tree_add_item(h224_tree, hf_h224_extended_client_id, tvb, offset, 2, ENC_NA);
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offset += 2;
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} else if (oct == 0x7f){
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proto_tree_add_item(h224_tree, hf_h224_client_id_country, tvb, offset, 2, ENC_NA);
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offset += 2;
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proto_tree_add_item(h224_tree, hf_h224_client_id_manufacturer, tvb, offset, 2, ENC_NA);
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offset += 2;
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proto_tree_add_item(h224_tree, hf_h224_extended_client_id, tvb, offset, 2, ENC_NA);
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offset += 2;
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} else {
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proto_tree_add_item(h224_tree, hf_h224_standard_client_id, tvb, offset, 1, ENC_NA);
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offset++;
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}
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static int* const h224_flags[] = {
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&hf_h224_es_b7,
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&hf_h224_bs_b6,
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&hf_h224_c1_b5,
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&hf_h224_c2_b4,
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&hf_h224_seg_b3b0,
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NULL
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};
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proto_tree_add_bitmask_list(h224_tree, tvb, offset, 1, h224_flags, ENC_BIG_ENDIAN);
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offset++;
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/* Data */
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proto_tree_add_item(h224_tree, hf_h224_client_data, tvb, offset, -1, ENC_NA);
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return tvb_reported_length(tvb);
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}
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/* Register the protocol with Wireshark. */
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void
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proto_register_h224(void)
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{
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//module_t *h224_module;
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//expert_module_t *expert_h224;
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static hf_register_info hf[] = {
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{ &hf_h224_dta,
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{ "Destination Terminal Address", "h224.dta",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_h224_sta,
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{ "Source Terminal Address", "h224.sta",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_h224_reserved,
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{ "Reserved", "h224.reserved",
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FT_UINT8, BASE_DEC, NULL, 0x80,
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NULL, HFILL }
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},
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{ &hf_h224_standard_client_id,
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{ "Standard Client ID", "h224.standard_client_id",
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FT_UINT8, BASE_DEC, NULL, 0x3f,
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NULL, HFILL }
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},
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{ &hf_h224_extended_client_id,
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{ "Extended Client ID", "h224.standard_client_id",
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FT_UINT8, BASE_DEC, NULL, 0x3f,
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NULL, HFILL }
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},
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{ &hf_h224_client_id_country,
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{ "Client ID country", "h224.standard_client_id_country",
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FT_UINT8, BASE_DEC, NULL, 0x3f,
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NULL, HFILL }
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},
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{ &hf_h224_client_id_manufacturer,
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{ "Manufacturer Client ID", "h224.manufacturer_client_id",
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FT_UINT8, BASE_DEC, NULL, 0x3f,
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NULL, HFILL }
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},
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{ &hf_h224_es_b7,
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{ "Ending Segment(ES)", "h224.flag.es",
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FT_BOOLEAN, 8, NULL, 0x80,
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NULL, HFILL }
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},
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{ &hf_h224_bs_b6,
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{ "Beginning Segment(BS)", "h224.flag.bs",
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FT_BOOLEAN, 8, NULL, 0x40,
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NULL, HFILL }
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},
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{ &hf_h224_c1_b5,
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{ "C1", "h224.flag.c1",
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FT_BOOLEAN, 8, NULL, 0x20,
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NULL, HFILL }
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},
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{ &hf_h224_c2_b4,
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{ "C0", "h224.flag.c0",
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FT_BOOLEAN, 8, NULL, 0x10,
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NULL, HFILL }
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},
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{ &hf_h224_seg_b3b0,
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{ "Sequence number", "h224.flags_seq",
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FT_UINT8, BASE_DEC, NULL, 0x0f,
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NULL, HFILL }
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},
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{ &hf_h224_client_data,
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{ "Client data", "h224.data",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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};
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static gint *ett[] = {
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&ett_h224
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};
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/* Setup protocol expert items */
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//static ei_register_info ei[] = {
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// { &ei_h224_EXPERTABBREV,
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// { "h224.EXPERTABBREV", PI_GROUP, PI_SEVERITY,
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// "EXPERTDESCR", EXPFILL }
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// }
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//};
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/* Register the protocol name and description */
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proto_h224 = proto_register_protocol("h.224", "H.224", "h.224");
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/* Register the header fields and subtrees */
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proto_register_field_array(proto_h224, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Register expert items */
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// expert_h224 = expert_register_protocol(proto_h224);
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// expert_register_field_array(expert_h224, ei, array_length(ei));
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h224_handle = register_dissector("h224", dissect_h224, proto_h224);
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}
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void
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proto_reg_handoff_h224(void)
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{
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dissector_add_string("rtp_dyn_payload_type", "H224", h224_handle);
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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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