forked from osmocom/wireshark
241 lines
8.1 KiB
C
241 lines
8.1 KiB
C
/* packet-dvb-sit.c
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* Routines for DVB (ETSI EN 300 468) Selection Information Table (SIT) dissection
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* Copyright 2021, Roman Volkov <volkoff_roman@ukr.net>
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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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#include "config.h"
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#include <epan/packet.h>
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#include "packet-mpeg-sect.h"
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#include "packet-mpeg-descriptor.h"
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void proto_register_dvb_sit(void);
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void proto_reg_handoff_dvb_sit(void);
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static dissector_handle_t dvb_sit_handle;
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static int proto_dvb_sit = -1;
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static int hf_dvb_sit_reserved_future_use1 = -1;
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static int hf_dvb_sit_reserved = -1;
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static int hf_dvb_sit_version_number = -1;
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static int hf_dvb_sit_current_next_indicator = -1;
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static int hf_dvb_sit_section_number = -1;
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static int hf_dvb_sit_last_section_number = -1;
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static int hf_dvb_sit_reserved_future_use2 = -1;
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static int hf_dvb_sit_transmission_info_len = -1;
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static int hf_dvb_sit_service_id = -1;
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static int hf_dvb_sit_reserved_future_use3 = -1;
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static int hf_dvb_sit_running_status = -1;
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static int hf_dvb_sit_service_descriptors_length = -1;
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static gint ett_dvb_sit = -1;
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static gint ett_dvb_sit_service = -1;
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#define DVB_SIT_RESERVED_MASK 0xC0
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#define DVB_SIT_VERSION_NUMBER_MASK 0x3E
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#define DVB_SIT_CURRENT_NEXT_INDICATOR_MASK 0x01
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#define DVB_SIT_RESERVED_FUTURE_USE2_MASK 0xF000
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#define DVB_SIT_TRANSMISSION_INFO_MASK 0x0FFF
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#define DVB_SIT_RESERVED_FUTURE_USE3_MASK 0x8000
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#define DVB_SIT_RUNNING_STATUS_MASK 0x7000
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#define DVB_SIT_SERVICE_DESCRIPTORS_LENGTH_MASK 0x0FFF
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static const value_string dvb_sit_cur_next_vals[] = {
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{ 0, "Not yet applicable" },
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{ 1, "Currently applicable" },
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{ 0, NULL }
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};
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static const value_string dvb_sit_running_status_vals[] = {
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{ 0, "Undefined" },
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{ 1, "Not Running" },
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{ 2, "Starts in a few seconds" },
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{ 3, "Pausing" },
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{ 4, "Running" },
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{ 5, "Service off-air" },
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{ 0, NULL }
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};
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static int
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dissect_dvb_sit(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint offset = 0, length = 0;
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guint descriptor_len;
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guint16 svc_id;
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proto_item *ti;
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proto_tree *dvb_sit_tree;
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proto_tree *dvb_sit_service_tree;
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/* The TVB should start right after the section_length in the Section packet */
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col_set_str(pinfo->cinfo, COL_INFO, "Selection Information Table (SIT)");
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ti = proto_tree_add_item(tree, proto_dvb_sit, tvb, offset, -1, ENC_NA);
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dvb_sit_tree = proto_item_add_subtree(ti, ett_dvb_sit);
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offset += packet_mpeg_sect_header(tvb, offset, dvb_sit_tree, &length, NULL);
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length -= 4;
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proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_reserved_future_use1, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_SIT_TRANSMISSION_INFO_MASK;
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proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_reserved_future_use2, tvb, offset, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_transmission_info_len, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_sit_tree);
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if (offset >= length)
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return offset;
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/* Parse all the services */
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while (offset < length) {
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svc_id = tvb_get_ntohs(tvb, offset);
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dvb_sit_service_tree = proto_tree_add_subtree_format(dvb_sit_tree, tvb, offset, 5,
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ett_dvb_sit_service, NULL, "Service 0x%04hx", svc_id);
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proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_service_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_reserved_future_use3, tvb, offset, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_running_status, tvb, offset, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_service_descriptors_length, tvb, offset, 2, ENC_BIG_ENDIAN);
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descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_SIT_SERVICE_DESCRIPTORS_LENGTH_MASK;
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offset += 2;
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offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_sit_service_tree);
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}
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offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_sit_tree, 0, offset);
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proto_item_set_len(ti, offset);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_dvb_sit(void)
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{
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static hf_register_info hf[] = {
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{ &hf_dvb_sit_reserved_future_use1, {
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"Reserved", "dvb_sit.reserved_future_use1",
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FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
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} },
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{ &hf_dvb_sit_reserved, {
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"Reserved", "dvb_sit.reserved",
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FT_UINT8, BASE_HEX, NULL, DVB_SIT_RESERVED_MASK, NULL, HFILL
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} },
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{ &hf_dvb_sit_version_number, {
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"Version Number", "dvb_sit.version",
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FT_UINT8, BASE_HEX, NULL, DVB_SIT_VERSION_NUMBER_MASK, NULL, HFILL
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} },
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{ &hf_dvb_sit_current_next_indicator, {
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"Current/Next Indicator", "dvb_sit.cur_next_ind",
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FT_UINT8, BASE_DEC, VALS(dvb_sit_cur_next_vals), DVB_SIT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
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} },
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{ &hf_dvb_sit_section_number, {
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"Section Number", "dvb_sit.sect_num",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
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} },
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{ &hf_dvb_sit_last_section_number, {
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"Last Section Number", "dvb_sit.last_sect_num",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
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} },
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{ &hf_dvb_sit_reserved_future_use2, {
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"Reserved", "dvb_sit.reserved_future_use2",
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FT_UINT16, BASE_HEX, NULL, DVB_SIT_RESERVED_FUTURE_USE2_MASK, NULL, HFILL
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} },
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{ &hf_dvb_sit_transmission_info_len, {
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"Transmission Info Descriptors Length", "dvb_sit.transmission_info_descriptors_length",
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FT_UINT16, BASE_DEC, NULL, DVB_SIT_TRANSMISSION_INFO_MASK, NULL, HFILL
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} },
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{ &hf_dvb_sit_service_id, {
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"Service ID", "dvb_sit.svc.id",
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FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
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} },
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{ &hf_dvb_sit_reserved_future_use3, {
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"Reserved", "dvb_sit.svc.reserved_future_use3",
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FT_UINT16, BASE_HEX, NULL, DVB_SIT_RESERVED_FUTURE_USE3_MASK, NULL, HFILL
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} },
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{ &hf_dvb_sit_running_status, {
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"Running Status", "dvb_sit.svc.running_status",
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FT_UINT16, BASE_HEX, VALS(dvb_sit_running_status_vals), DVB_SIT_RUNNING_STATUS_MASK, NULL, HFILL
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} },
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{ &hf_dvb_sit_service_descriptors_length, {
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"Service Descriptors Length", "dvb_sit.svc.service_descriptors_length",
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FT_UINT16, BASE_DEC, NULL, DVB_SIT_SERVICE_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
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} }
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};
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static gint *ett[] = {
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&ett_dvb_sit,
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&ett_dvb_sit_service
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};
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proto_dvb_sit = proto_register_protocol("DVB Selection Information Table", "DVB SIT", "dvb_sit");
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dvb_sit_handle = register_dissector("dvb_sit", dissect_dvb_sit, proto_dvb_sit);
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proto_register_field_array(proto_dvb_sit, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void proto_reg_handoff_dvb_sit(void)
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{
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dissector_add_uint("mpeg_sect.tid", DVB_SIT_TID, dvb_sit_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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