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/* packet-dvb-sit.c
* Routines for DVB (ETSI EN 300 468) Selection Information Table (SIT) dissection
* Copyright 2021, Roman Volkov <volkoff_roman@ukr.net>
*
* 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_sit(void);
void proto_reg_handoff_dvb_sit(void);
static dissector_handle_t dvb_sit_handle;
static int proto_dvb_sit = -1;
static int hf_dvb_sit_reserved_future_use1 = -1;
static int hf_dvb_sit_reserved = -1;
static int hf_dvb_sit_version_number = -1;
static int hf_dvb_sit_current_next_indicator = -1;
static int hf_dvb_sit_section_number = -1;
static int hf_dvb_sit_last_section_number = -1;
static int hf_dvb_sit_reserved_future_use2 = -1;
static int hf_dvb_sit_transmission_info_len = -1;
static int hf_dvb_sit_service_id = -1;
static int hf_dvb_sit_reserved_future_use3 = -1;
static int hf_dvb_sit_running_status = -1;
static int hf_dvb_sit_service_descriptors_length = -1;
static gint ett_dvb_sit = -1;
static gint ett_dvb_sit_service = -1;
#define DVB_SIT_RESERVED_MASK 0xC0
#define DVB_SIT_VERSION_NUMBER_MASK 0x3E
#define DVB_SIT_CURRENT_NEXT_INDICATOR_MASK 0x01
#define DVB_SIT_RESERVED_FUTURE_USE2_MASK 0xF000
#define DVB_SIT_TRANSMISSION_INFO_MASK 0x0FFF
#define DVB_SIT_RESERVED_FUTURE_USE3_MASK 0x8000
#define DVB_SIT_RUNNING_STATUS_MASK 0x7000
#define DVB_SIT_SERVICE_DESCRIPTORS_LENGTH_MASK 0x0FFF
static const value_string dvb_sit_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 int
dissect_dvb_sit(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_sit_tree;
proto_tree *dvb_sit_service_tree;
/* The TVB should start right after the section_length in the Section packet */
col_set_str(pinfo->cinfo, COL_INFO, "Selection Information Table (SIT)");
ti = proto_tree_add_item(tree, proto_dvb_sit, tvb, offset, -1, ENC_NA);
dvb_sit_tree = proto_item_add_subtree(ti, ett_dvb_sit);
offset += packet_mpeg_sect_header(tvb, offset, dvb_sit_tree, &length, NULL);
length -= 4;
proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_reserved_future_use1, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_SIT_TRANSMISSION_INFO_MASK;
proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_reserved_future_use2, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_sit_tree, hf_dvb_sit_transmission_info_len, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_sit_tree);
if (offset >= length)
return offset;
/* Parse all the services */
while (offset < length) {
svc_id = tvb_get_ntohs(tvb, offset);
dvb_sit_service_tree = proto_tree_add_subtree_format(dvb_sit_tree, tvb, offset, 5,
ett_dvb_sit_service, NULL, "Service 0x%04hx", svc_id);
proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_service_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_reserved_future_use3, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_running_status, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_sit_service_tree, hf_dvb_sit_service_descriptors_length, tvb, offset, 2, ENC_BIG_ENDIAN);
descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_SIT_SERVICE_DESCRIPTORS_LENGTH_MASK;
offset += 2;
offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_sit_service_tree);
}
offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_sit_tree, 0, offset);
proto_item_set_len(ti, offset);
return tvb_captured_length(tvb);
}
void
proto_register_dvb_sit(void)
{
static hf_register_info hf[] = {
{ &hf_dvb_sit_reserved_future_use1, {
"Reserved", "dvb_sit.reserved_future_use1",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_dvb_sit_reserved, {
"Reserved", "dvb_sit.reserved",
FT_UINT8, BASE_HEX, NULL, DVB_SIT_RESERVED_MASK, NULL, HFILL
} },
{ &hf_dvb_sit_version_number, {
"Version Number", "dvb_sit.version",
FT_UINT8, BASE_HEX, NULL, DVB_SIT_VERSION_NUMBER_MASK, NULL, HFILL
} },
{ &hf_dvb_sit_current_next_indicator, {
"Current/Next Indicator", "dvb_sit.cur_next_ind",
FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), DVB_SIT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
} },
{ &hf_dvb_sit_section_number, {
"Section Number", "dvb_sit.sect_num",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} },
{ &hf_dvb_sit_last_section_number, {
"Last Section Number", "dvb_sit.last_sect_num",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} },
{ &hf_dvb_sit_reserved_future_use2, {
"Reserved", "dvb_sit.reserved_future_use2",
FT_UINT16, BASE_HEX, NULL, DVB_SIT_RESERVED_FUTURE_USE2_MASK, NULL, HFILL
} },
{ &hf_dvb_sit_transmission_info_len, {
"Transmission Info Descriptors Length", "dvb_sit.transmission_info_descriptors_length",
FT_UINT16, BASE_DEC, NULL, DVB_SIT_TRANSMISSION_INFO_MASK, NULL, HFILL
} },
{ &hf_dvb_sit_service_id, {
"Service ID", "dvb_sit.svc.id",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_dvb_sit_reserved_future_use3, {
"Reserved", "dvb_sit.svc.reserved_future_use3",
FT_UINT16, BASE_HEX, NULL, DVB_SIT_RESERVED_FUTURE_USE3_MASK, NULL, HFILL
} },
{ &hf_dvb_sit_running_status, {
"Running Status", "dvb_sit.svc.running_status",
FT_UINT16, BASE_HEX, VALS(dvb_sit_running_status_vals), DVB_SIT_RUNNING_STATUS_MASK, NULL, HFILL
} },
{ &hf_dvb_sit_service_descriptors_length, {
"Service Descriptors Length", "dvb_sit.svc.service_descriptors_length",
FT_UINT16, BASE_DEC, NULL, DVB_SIT_SERVICE_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
} }
};
static gint *ett[] = {
&ett_dvb_sit,
&ett_dvb_sit_service
};
proto_dvb_sit = proto_register_protocol("DVB Selection Information Table", "DVB SIT", "dvb_sit");
dvb_sit_handle = register_dissector("dvb_sit", dissect_dvb_sit, proto_dvb_sit);
proto_register_field_array(proto_dvb_sit, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void proto_reg_handoff_dvb_sit(void)
{
dissector_add_uint("mpeg_sect.tid", DVB_SIT_TID, dvb_sit_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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