diff options
Diffstat (limited to 'epan/dissectors/packet-dvb-sdt.c')
-rw-r--r-- | epan/dissectors/packet-dvb-sdt.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/epan/dissectors/packet-dvb-sdt.c b/epan/dissectors/packet-dvb-sdt.c new file mode 100644 index 00000000..586a5eab --- /dev/null +++ b/epan/dissectors/packet-dvb-sdt.c @@ -0,0 +1,267 @@ +/* packet-mpeg-sdt.c + * Routines for DVB (ETSI EN 300 468) Servide Description Table (SDT) dissection + * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be> + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "config.h" + +#include <epan/packet.h> +#include "packet-mpeg-sect.h" +#include "packet-mpeg-descriptor.h" + +void proto_register_dvb_sdt(void); +void proto_reg_handoff_dvb_sdt(void); + +static dissector_handle_t dvb_sdt_handle; + +static int proto_dvb_sdt = -1; +static int hf_dvb_sdt_transport_stream_id = -1; +static int hf_dvb_sdt_reserved1 = -1; +static int hf_dvb_sdt_version_number = -1; +static int hf_dvb_sdt_current_next_indicator = -1; +static int hf_dvb_sdt_section_number = -1; +static int hf_dvb_sdt_last_section_number = -1; + +static int hf_dvb_sdt_original_network_id = -1; +static int hf_dvb_sdt_reserved2 = -1; + +static int hf_dvb_sdt_service_id = -1; +static int hf_dvb_sdt_reserved3 = -1; +static int hf_dvb_sdt_eit_schedule_flag = -1; +static int hf_dvb_sdt_eit_present_following_flag = -1; +static int hf_dvb_sdt_running_status = -1; +static int hf_dvb_sdt_free_ca_mode = -1; +static int hf_dvb_sdt_descriptors_loop_length = -1; + +static gint ett_dvb_sdt = -1; +static gint ett_dvb_sdt_service = -1; + +#define DVB_SDT_RESERVED1_MASK 0xC0 +#define DVB_SDT_VERSION_NUMBER_MASK 0x3E +#define DVB_SDT_CURRENT_NEXT_INDICATOR_MASK 0x01 + +#define DVB_SDT_RESERVED3_MASK 0xFC +#define DVB_SDT_EIT_SCHEDULE_FLAG_MASK 0x02 +#define DVB_SDT_EIT_PRESENT_FOLLOWING_FLAG_MASK 0x01 + +#define DVB_SDT_RUNNING_STATUS_MASK 0xE000 +#define DVB_SDT_FREE_CA_MODE_MASK 0x1000 +#define DVB_SDT_DESCRIPTORS_LOOP_LENGTH_MASK 0x0FFF + +static const value_string dvb_sdt_running_status_vals[] = { + { 0, "Undefined" }, + { 1, "Not Running" }, + { 2, "Starts in a few seconds" }, + { 3, "Pausing" }, + { 4, "Running" }, + { 5, "Service off-air" }, + + { 0, NULL } +}; + +static const value_string dvb_sdt_free_ca_mode_vals[] = { + { 0, "Not Scrambled" }, + { 1, "One or more component scrambled" }, + + { 0, NULL } +}; + +static int +dissect_dvb_sdt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) +{ + + guint offset = 0, length = 0; + guint descriptor_len; + guint16 svc_id; + + proto_item *ti; + proto_tree *dvb_sdt_tree; + proto_tree *dvb_sdt_service_tree; + + /* The TVB should start right after the section_length in the Section packet */ + + col_set_str(pinfo->cinfo, COL_INFO, "Service Description Table (SDT)"); + + ti = proto_tree_add_item(tree, proto_dvb_sdt, tvb, offset, -1, ENC_NA); + dvb_sdt_tree = proto_item_add_subtree(ti, ett_dvb_sdt); + + offset += packet_mpeg_sect_header(tvb, offset, dvb_sdt_tree, &length, NULL); + length -= 4; + + proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN); + offset += 2; + + proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_reserved1, tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_version_number, tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + + proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_section_number, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + + proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + + proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_original_network_id, tvb, offset, 2, ENC_BIG_ENDIAN); + offset += 2; + + proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_reserved2, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + + + if (offset >= length) + return offset; + + /* Parse all the services */ + while (offset < length) { + + svc_id = tvb_get_ntohs(tvb, offset); + dvb_sdt_service_tree = proto_tree_add_subtree_format(dvb_sdt_tree, tvb, offset, 5, + ett_dvb_sdt_service, NULL, "Service 0x%04hx", svc_id); + + proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_service_id, tvb, offset, 2, ENC_BIG_ENDIAN); + offset += 2; + + proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_reserved3, tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_eit_schedule_flag, tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_eit_present_following_flag, tvb, offset, 1, ENC_BIG_ENDIAN); + offset += 1; + + proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_running_status, tvb, offset, 2, ENC_BIG_ENDIAN); + proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_free_ca_mode, tvb, offset, 2, ENC_BIG_ENDIAN); + proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_descriptors_loop_length, tvb, offset, 2, ENC_BIG_ENDIAN); + descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_SDT_DESCRIPTORS_LOOP_LENGTH_MASK; + offset += 2; + + offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_sdt_service_tree); + } + + offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_sdt_tree, 0, offset); + proto_item_set_len(ti, offset); + return tvb_captured_length(tvb); +} + + +void +proto_register_dvb_sdt(void) +{ + + static hf_register_info hf[] = { + + { &hf_dvb_sdt_transport_stream_id, { + "Transport Stream ID", "dvb_sdt.tsid", + FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL + } }, + + { &hf_dvb_sdt_reserved1, { + "Reserved", "dvb_sdt.reserved1", + FT_UINT8, BASE_HEX, NULL, DVB_SDT_RESERVED1_MASK, NULL, HFILL + } }, + + { &hf_dvb_sdt_version_number, { + "Version Number", "dvb_sdt.version", + FT_UINT8, BASE_HEX, NULL, DVB_SDT_VERSION_NUMBER_MASK, NULL, HFILL + } }, + + { &hf_dvb_sdt_current_next_indicator, { + "Current/Next Indicator", "dvb_sdt.cur_next_ind", + FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), DVB_SDT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL + } }, + + { &hf_dvb_sdt_section_number, { + "Section Number", "dvb_sdt.sect_num", + FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL + } }, + + { &hf_dvb_sdt_last_section_number, { + "Last Section Number", "dvb_sdt.last_sect_num", + FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL + } }, + + { &hf_dvb_sdt_original_network_id, { + "Original Network ID", "dvb_sdt.original_nid", + FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL + } }, + + { &hf_dvb_sdt_reserved2, { + "Reserved", "dvb_sdt.reserved2", + FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL + } }, + + + { &hf_dvb_sdt_service_id, { + "Service ID", "dvb_sdt.svc.id", + FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL + } }, + + { &hf_dvb_sdt_reserved3, { + "Reserved", "dvb_sdt.svc.reserved", + FT_UINT8, BASE_HEX, NULL, DVB_SDT_RESERVED3_MASK, NULL, HFILL + } }, + + { &hf_dvb_sdt_eit_schedule_flag, { + "EIT Schedule Flag", "dvb_sdt.svc.eit_schedule_flag", + FT_UINT8, BASE_DEC, NULL, DVB_SDT_EIT_SCHEDULE_FLAG_MASK, NULL, HFILL + } }, + + { &hf_dvb_sdt_eit_present_following_flag, { + "EIT Present Following Flag", "dvb_sdt.svc.eit_present_following_flag", + FT_UINT8, BASE_DEC, NULL, DVB_SDT_EIT_PRESENT_FOLLOWING_FLAG_MASK, NULL, HFILL + } }, + + { &hf_dvb_sdt_running_status, { + "Running Status", "dvb_sdt.svc.running_status", + FT_UINT16, BASE_HEX, VALS(dvb_sdt_running_status_vals), DVB_SDT_RUNNING_STATUS_MASK, NULL, HFILL + } }, + + { &hf_dvb_sdt_free_ca_mode, { + "Free CA Mode", "dvb_sdt.svc.free_ca_mode", + FT_UINT16, BASE_HEX, VALS(dvb_sdt_free_ca_mode_vals), DVB_SDT_FREE_CA_MODE_MASK, NULL, HFILL + } }, + + { &hf_dvb_sdt_descriptors_loop_length, { + "Descriptors Loop Length", "dvb_sdt.svc.descr_loop_len", + FT_UINT16, BASE_DEC, NULL, DVB_SDT_DESCRIPTORS_LOOP_LENGTH_MASK, NULL, HFILL + } } + + }; + + static gint *ett[] = { + &ett_dvb_sdt, + &ett_dvb_sdt_service + }; + + proto_dvb_sdt = proto_register_protocol("DVB Service Description Table", "DVB SDT", "dvb_sdt"); + + proto_register_field_array(proto_dvb_sdt, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + dvb_sdt_handle = register_dissector("dvb_sdt", dissect_dvb_sdt, proto_dvb_sdt); +} + + +void proto_reg_handoff_dvb_sdt(void) +{ + dissector_add_uint("mpeg_sect.tid", DVB_SDT_TID_ACTUAL, dvb_sdt_handle); + dissector_add_uint("mpeg_sect.tid", DVB_SDT_TID_OTHER, dvb_sdt_handle); +} + + +/* + * 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: + */ |