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/* packet-etv.c
*
* Routines for ETV-AM from OC-SP-ETV-AM1.0-IO5
* Copyright 2012, Weston Schmidt <weston_schmidt@alumni.purdue.edu>
*
* 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/expert.h>
#include "packet-mpeg-sect.h"
void proto_register_etv(void);
void proto_reg_handoff_etv(void);
static dissector_handle_t etv_dii_handle;
static dissector_handle_t etv_ddb_handle;
static int proto_etv_dii;
static int proto_etv_ddb;
static dissector_handle_t dsmcc_handle;
static int hf_etv_dii_filter_info;
static int hf_etv_dii_reserved;
static expert_field ei_etv_dii_invalid_section_syntax_indicator;
static expert_field ei_etv_dii_invalid_section_length;
static expert_field ei_etv_dii_invalid_reserved_bits;
static expert_field ei_etv_dii_filter_info;
static int hf_etv_ddb_filter_info;
static int hf_etv_ddb_reserved;
static expert_field ei_etv_ddb_invalid_section_syntax_indicator;
static expert_field ei_etv_ddb_invalid_section_length;
static expert_field ei_etv_ddb_invalid_reserved_bits;
static expert_field ei_etv_ddb_filter_info;
static gint ett_etv;
static gint ett_etv_payload;
static void
dissect_etv_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int proto,
int hf_filter_info, int hf_reserved,
expert_field* ei_section_syntax_indicator, expert_field* ei_reserved,
expert_field* ei_section_length, expert_field* ei_filter_info)
{
tvbuff_t *sub_tvb;
guint offset = 0;
proto_item *ti;
proto_item *pi;
proto_tree *etv_tree;
proto_item *items[PACKET_MPEG_SECT_PI__SIZE];
gboolean ssi;
guint reserved;
guint8 reserved2;
guint16 filter_info;
guint sect_len;
ti = proto_tree_add_item(tree, proto, tvb, offset, -1, ENC_NA);
etv_tree = proto_item_add_subtree(ti, ett_etv);
offset += packet_mpeg_sect_header_extra(tvb, offset, etv_tree, §_len,
&reserved, &ssi, items);
if (FALSE != ssi) {
proto_item *msg_error;
msg_error = items[PACKET_MPEG_SECT_PI__SSI];
proto_item_set_generated(msg_error);
expert_add_info(pinfo, msg_error, ei_section_syntax_indicator);
}
if (4 != reserved) {
proto_item *msg_error;
msg_error = items[PACKET_MPEG_SECT_PI__RESERVED];
proto_item_set_generated(msg_error);
expert_add_info(pinfo, msg_error, ei_reserved);
}
col_append_fstr(pinfo->cinfo, COL_INFO, ", Length: %u", sect_len);
proto_item_append_text(ti, " Length=%u", sect_len);
if (1021 < sect_len) {
proto_item *msg_error;
msg_error = items[PACKET_MPEG_SECT_PI__LENGTH];
proto_item_set_generated(msg_error);
expert_add_info(pinfo, msg_error, ei_section_length);
}
filter_info = tvb_get_ntohs(tvb, offset);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Filter: 0x%x", filter_info);
proto_item_append_text(ti, " Filter=0x%x", filter_info);
pi = proto_tree_add_item(etv_tree, hf_filter_info, tvb, offset, 2, ENC_BIG_ENDIAN);
if ((proto_etv_dii == proto) && (0xFBFB != filter_info)) {
expert_add_info_format(pinfo, pi, ei_filter_info,
"Invalid filter_info value (must be 0xFBFB)");
} else if ((proto_etv_ddb == proto) &&
((filter_info < 1) || (0xfbef < filter_info)))
{
expert_add_info_format(pinfo, pi, ei_filter_info,
"Invalid filter_info value (must be [0x0001-0xFBEF] inclusive)");
}
offset += 2;
reserved2 = tvb_get_guint8(tvb, offset);
pi = proto_tree_add_item(etv_tree, hf_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
if (0 != reserved2) {
expert_add_info_format(pinfo, pi, ei_reserved,
"Invalid reserved2 bits (should all be 0)");
}
offset += 1;
sub_tvb = tvb_new_subset_length(tvb, offset, sect_len-7);
call_dissector(dsmcc_handle, sub_tvb, pinfo, tree);
sect_len += 3 - 4; /* add header, remove crc */
packet_mpeg_sect_crc(tvb, pinfo, etv_tree, 0, sect_len);
}
static int
dissect_etv_ddb(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETV-DDB");
col_set_str(pinfo->cinfo, COL_INFO, "ETV DDB");
dissect_etv_common(tvb, pinfo, tree, proto_etv_ddb, hf_etv_ddb_filter_info,
hf_etv_ddb_reserved, &ei_etv_ddb_invalid_section_syntax_indicator,
&ei_etv_ddb_invalid_reserved_bits, &ei_etv_ddb_invalid_section_length,
&ei_etv_ddb_filter_info);
return tvb_captured_length(tvb);
}
static int
dissect_etv_dii(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETV-DII");
col_set_str(pinfo->cinfo, COL_INFO, "ETV DII");
dissect_etv_common(tvb, pinfo, tree, proto_etv_dii, hf_etv_dii_filter_info,
hf_etv_dii_reserved, &ei_etv_dii_invalid_section_syntax_indicator,
&ei_etv_dii_invalid_reserved_bits, &ei_etv_dii_invalid_section_length,
&ei_etv_dii_filter_info);
return tvb_captured_length(tvb);
}
void
proto_register_etv(void)
{
static hf_register_info hf_ddb[] = {
{ &hf_etv_ddb_filter_info, {
"Filter Info", "etv-ddb.filter_info",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_etv_ddb_reserved, {
"Reserved", "etv-ddb.reserved",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} }
};
static hf_register_info hf_dii[] = {
{ &hf_etv_dii_filter_info, {
"Filter Info", "etv-dii.filter_info",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_etv_dii_reserved, {
"Reserved", "etv-dii.reserved",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} }
};
static gint *ett[] = {
&ett_etv,
&ett_etv_payload
};
static ei_register_info ei_ddb[] = {
{ &ei_etv_ddb_invalid_section_syntax_indicator, { "etv-ddb.invalid_section_syntax_indicator", PI_MALFORMED, PI_ERROR, "Invalid section_syntax_indicator (should be 0)", EXPFILL }},
{ &ei_etv_ddb_invalid_reserved_bits, { "etv-ddb.invalid_reserved_bits", PI_MALFORMED, PI_ERROR, "Invalid reserved bits", EXPFILL }},
{ &ei_etv_ddb_invalid_section_length, { "etv-ddb.invalid_section_length", PI_MALFORMED, PI_ERROR, "Invalid section_length (must not exceed 1021)", EXPFILL }},
{ &ei_etv_ddb_filter_info, { "etv-ddb.filter_info.invalid", PI_MALFORMED, PI_ERROR, "Invalid filter info", EXPFILL }},
};
static ei_register_info ei_dii[] = {
{ &ei_etv_dii_invalid_section_syntax_indicator, { "etv-dii.invalid_section_syntax_indicator", PI_MALFORMED, PI_ERROR, "Invalid section_syntax_indicator (should be 0)", EXPFILL }},
{ &ei_etv_dii_invalid_reserved_bits, { "etv-dii.invalid_reserved_bits", PI_MALFORMED, PI_ERROR, "Invalid reserved bits", EXPFILL }},
{ &ei_etv_dii_invalid_section_length, { "etv-dii.invalid_section_length", PI_MALFORMED, PI_ERROR, "Invalid section_length (must not exceed 1021)", EXPFILL }},
{ &ei_etv_dii_filter_info, { "etv-dii.filter_info.invalid", PI_MALFORMED, PI_ERROR, "Invalid filter info", EXPFILL }},
};
expert_module_t* expert_etv_dii;
expert_module_t* expert_etv_ddb;
proto_etv_dii = proto_register_protocol("ETV-AM DII Section", "ETV-AM DII", "etv-dii");
proto_etv_ddb = proto_register_protocol("ETV-AM DDB Section", "ETV-AM DDB", "etv-ddb");
proto_register_field_array(proto_etv_dii, hf_dii, array_length(hf_dii));
proto_register_field_array(proto_etv_ddb, hf_ddb, array_length(hf_ddb));
proto_register_subtree_array(ett, array_length(ett));
expert_etv_dii = expert_register_protocol(proto_etv_dii);
expert_register_field_array(expert_etv_dii, ei_dii, array_length(ei_dii));
expert_etv_ddb = expert_register_protocol(proto_etv_ddb);
expert_register_field_array(expert_etv_ddb, ei_ddb, array_length(ei_ddb));
etv_dii_handle = register_dissector("etv-dii", dissect_etv_dii, proto_etv_dii);
etv_ddb_handle = register_dissector("etv-ddb", dissect_etv_ddb, proto_etv_ddb);
}
void
proto_reg_handoff_etv(void)
{
dissector_add_uint("mpeg_sect.tid", ETV_TID_DII_SECTION, etv_dii_handle);
dissector_add_uint("mpeg_sect.tid", ETV_TID_DDB_SECTION, etv_ddb_handle);
dsmcc_handle = find_dissector_add_dependency("mp2t-dsmcc", proto_etv_dii);
find_dissector_add_dependency("mp2t-dsmcc", proto_etv_ddb);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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