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/* packet-dvb-nit.c
* Routines for DVB (ETSI EN 300 468) Network Information Table (NIT) 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_nit(void);
void proto_reg_handoff_dvb_nit(void);
static int proto_dvb_nit = -1;
static int hf_dvb_nit_network_id = -1;
static int hf_dvb_nit_reserved1 = -1;
static int hf_dvb_nit_version_number = -1;
static int hf_dvb_nit_current_next_indicator = -1;
static int hf_dvb_nit_section_number = -1;
static int hf_dvb_nit_last_section_number = -1;
static int hf_dvb_nit_reserved2 = -1;
static int hf_dvb_nit_network_descriptors_length = -1;
static int hf_dvb_nit_reserved3 = -1;
static int hf_dvb_nit_transport_stream_loop_length = -1;
static int hf_dvb_nit_transport_stream_id = -1;
static int hf_dvb_nit_original_network_id = -1;
static int hf_dvb_nit_reserved4 = -1;
static int hf_dvb_nit_transport_descriptors_length = -1;
static gint ett_dvb_nit = -1;
static gint ett_dvb_nit_ts = -1;
static dissector_handle_t dvb_nit_handle;
#define DVB_NIT_RESERVED1_MASK 0xC0
#define DVB_NIT_VERSION_NUMBER_MASK 0x3E
#define DVB_NIT_CURRENT_NEXT_INDICATOR_MASK 0x01
#define DVB_NIT_RESERVED2_MASK 0xF000
#define DVB_NIT_NETWORK_DESCRIPTORS_LENGTH_MASK 0x0FFF
#define DVB_NIT_RESERVED3_MASK 0xF000
#define DVB_NIT_TRANSPORT_STREAM_LOOP_LENGTH_MASK 0x0FFF
#define DVB_NIT_RESERVED4_MASK 0xF000
#define DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK 0x0FFF
static int
dissect_dvb_nit(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
guint offset = 0;
guint ts_desc_len, desc_loop_len, ts_end;
guint16 tsid;
proto_item *ti;
proto_tree *dvb_nit_tree;
proto_tree *dvb_nit_ts_tree;
col_set_str(pinfo->cinfo, COL_INFO, "Network Information Table (NIT)");
ti = proto_tree_add_item(tree, proto_dvb_nit, tvb, offset, -1, ENC_NA);
dvb_nit_tree = proto_item_add_subtree(ti, ett_dvb_nit);
offset += packet_mpeg_sect_header(tvb, offset, dvb_nit_tree, NULL, NULL);
proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_network_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_reserved1, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_reserved2, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_network_descriptors_length, tvb, offset, 2, ENC_BIG_ENDIAN);
desc_loop_len = tvb_get_ntohs(tvb, offset) & DVB_NIT_NETWORK_DESCRIPTORS_LENGTH_MASK;
offset += 2;
offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, desc_loop_len, dvb_nit_tree);
proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_reserved3, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_nit_tree, hf_dvb_nit_transport_stream_loop_length, tvb, offset, 2, ENC_BIG_ENDIAN);
ts_end = offset + (tvb_get_ntohs(tvb, offset) & DVB_NIT_TRANSPORT_STREAM_LOOP_LENGTH_MASK);
offset += 2;
while (offset < ts_end) {
tsid = tvb_get_ntohs(tvb, offset);
ts_desc_len = 3 + (tvb_get_ntohs(tvb, offset + 4) & DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK);
dvb_nit_ts_tree = proto_tree_add_subtree_format(dvb_nit_tree, tvb, offset, ts_desc_len,
ett_dvb_nit_ts, NULL, "Stream ID=0x%04hx", tsid);
proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_original_network_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_reserved4, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_nit_ts_tree, hf_dvb_nit_transport_descriptors_length, tvb, offset, 2, ENC_BIG_ENDIAN);
desc_loop_len = tvb_get_ntohs(tvb, offset) & DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK;
offset += 2;
offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, desc_loop_len, dvb_nit_ts_tree);
}
offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_nit_tree, 0, offset);
proto_item_set_len(ti, offset);
return offset;
}
void
proto_register_dvb_nit(void)
{
static hf_register_info hf[] = {
{ &hf_dvb_nit_network_id, {
"Network ID", "dvb_nit.sid",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_dvb_nit_reserved1, {
"Reserved", "dvb_nit.reserved1",
FT_UINT8, BASE_HEX, NULL, DVB_NIT_RESERVED1_MASK, NULL, HFILL
} },
{ &hf_dvb_nit_version_number, {
"Version Number", "dvb_nit.version",
FT_UINT8, BASE_HEX, NULL, DVB_NIT_VERSION_NUMBER_MASK, NULL, HFILL
} },
{ &hf_dvb_nit_current_next_indicator, {
"Current/Next Indicator", "dvb_nit.cur_next_ind",
FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), DVB_NIT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
} },
{ &hf_dvb_nit_section_number, {
"Section Number", "dvb_nit.sect_num",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} },
{ &hf_dvb_nit_last_section_number, {
"Last Section Number", "dvb_nit.last_sect_num",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} },
{ &hf_dvb_nit_reserved2, {
"Reserved", "dvb_nit.reserved2",
FT_UINT16, BASE_HEX, NULL, DVB_NIT_RESERVED2_MASK, NULL, HFILL
} },
{ &hf_dvb_nit_network_descriptors_length, {
"Network Descriptors Length", "dvb_nit.network_desc_len",
FT_UINT16, BASE_DEC, NULL, DVB_NIT_NETWORK_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
} },
{ &hf_dvb_nit_reserved3, {
"Reserved", "dvb_nit.reserved3",
FT_UINT16, BASE_HEX, NULL, DVB_NIT_RESERVED3_MASK, NULL, HFILL
} },
{ &hf_dvb_nit_transport_stream_loop_length, {
"Transport Stream Loop Length", "dvb_nit.ts_loop_len",
FT_UINT16, BASE_DEC, NULL, DVB_NIT_TRANSPORT_STREAM_LOOP_LENGTH_MASK, NULL, HFILL
} },
{ &hf_dvb_nit_transport_stream_id, {
"Transport Stream ID", "dvb_nit.ts.id",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_dvb_nit_original_network_id, {
"Original Network ID", "dvb_nit.ts.original_network_id",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_dvb_nit_reserved4, {
"Reserved", "dvb_nit.ts.reserved",
FT_UINT16, BASE_HEX, NULL, DVB_NIT_RESERVED4_MASK, NULL, HFILL
} },
{ &hf_dvb_nit_transport_descriptors_length, {
"Transport Descriptors Length", "dvb_nit.ts.desc_len",
FT_UINT16, BASE_DEC, NULL, DVB_NIT_TRANSPORT_DESCRIPTORS_LENGTH_MASK, NULL, HFILL
} },
};
static gint *ett[] = {
&ett_dvb_nit,
&ett_dvb_nit_ts
};
proto_dvb_nit = proto_register_protocol("DVB Network Information Table", "DVB NIT", "dvb_nit");
proto_register_field_array(proto_dvb_nit, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
dvb_nit_handle = register_dissector("dvb_nit", dissect_dvb_nit, proto_dvb_nit);
}
void proto_reg_handoff_dvb_nit(void)
{
dissector_add_uint("mpeg_sect.tid", DVB_NIT_TID, dvb_nit_handle);
dissector_add_uint("mpeg_sect.tid", DVB_NIT_TID_OTHER, dvb_nit_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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