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/* 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 <epan/tfs.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;
static int hf_dvb_sdt_transport_stream_id;
static int hf_dvb_sdt_reserved1;
static int hf_dvb_sdt_version_number;
static int hf_dvb_sdt_current_next_indicator;
static int hf_dvb_sdt_section_number;
static int hf_dvb_sdt_last_section_number;
static int hf_dvb_sdt_original_network_id;
static int hf_dvb_sdt_reserved2;
static int hf_dvb_sdt_service_id;
static int hf_dvb_sdt_reserved3;
static int hf_dvb_sdt_eit_schedule_flag;
static int hf_dvb_sdt_eit_present_following_flag;
static int hf_dvb_sdt_running_status;
static int hf_dvb_sdt_free_ca_mode;
static int hf_dvb_sdt_descriptors_loop_length;
static int ett_dvb_sdt;
static int ett_dvb_sdt_service;
#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_)
{
unsigned offset = 0, length = 0;
unsigned descriptor_len;
uint16_t 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 int *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:
*/
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