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/* packet-mpeg-ca.c
* Routines for MPEG2 (ISO/ISO 13818-1) Conditional Access Table (CA) 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_mpeg_ca(void);
void proto_reg_handoff_mpeg_ca(void);
static dissector_handle_t mpeg_ca_handle;
static int proto_mpeg_ca;
static int hf_mpeg_ca_reserved;
static int hf_mpeg_ca_version_number;
static int hf_mpeg_ca_current_next_indicator;
static int hf_mpeg_ca_section_number;
static int hf_mpeg_ca_last_section_number;
static int ett_mpeg_ca;
#define MPEG_CA_RESERVED_MASK 0xFFFFC0
#define MPEG_CA_VERSION_NUMBER_MASK 0x00003E
#define MPEG_CA_CURRENT_NEXT_INDICATOR_MASK 0x000001
static int
dissect_mpeg_ca(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
unsigned offset = 0, length = 0;
proto_item *ti;
proto_tree *mpeg_ca_tree;
/* The TVB should start right after the section_length in the Section packet */
col_set_str(pinfo->cinfo, COL_INFO, "Conditional Access Table (CA)");
ti = proto_tree_add_item(tree, proto_mpeg_ca, tvb, offset, -1, ENC_NA);
mpeg_ca_tree = proto_item_add_subtree(ti, ett_mpeg_ca);
offset += packet_mpeg_sect_header(tvb, offset, mpeg_ca_tree, &length, NULL);
length -= 4;
proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_reserved, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_version_number, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_current_next_indicator, tvb, offset, 3, ENC_BIG_ENDIAN);
offset += 3;
proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Parse all the programs */
while (offset < length)
offset += proto_mpeg_descriptor_dissect(tvb, offset, mpeg_ca_tree);
offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_ca_tree, 0, offset);
proto_item_set_len(ti, offset);
return tvb_captured_length(tvb);
}
void
proto_register_mpeg_ca(void)
{
static hf_register_info hf[] = {
{ &hf_mpeg_ca_reserved, {
"Reserved", "mpeg_ca.reserved",
FT_UINT24, BASE_HEX, NULL, MPEG_CA_RESERVED_MASK,
NULL, HFILL
} },
{ &hf_mpeg_ca_version_number, {
"Version Number", "mpeg_ca.version",
FT_UINT24, BASE_HEX, NULL, MPEG_CA_VERSION_NUMBER_MASK,
NULL, HFILL
} },
{ &hf_mpeg_ca_current_next_indicator, {
"Current/Next Indicator", "mpeg_ca.cur_next_ind",
FT_BOOLEAN, 24, TFS(&tfs_current_not_yet), MPEG_CA_CURRENT_NEXT_INDICATOR_MASK,
NULL, HFILL
} },
{ &hf_mpeg_ca_section_number, {
"Section Number", "mpeg_ca.sect_num",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL
} },
{ &hf_mpeg_ca_last_section_number, {
"Last Section Number", "mpeg_ca.last_sect_num",
FT_UINT8, BASE_DEC, NULL, 0,
NULL, HFILL
} },
};
static int *ett[] = {
&ett_mpeg_ca,
};
proto_mpeg_ca = proto_register_protocol("MPEG2 Conditional Access Table", "MPEG CA", "mpeg_ca");
proto_register_field_array(proto_mpeg_ca, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
mpeg_ca_handle = register_dissector("mpeg_ca", dissect_mpeg_ca, proto_mpeg_ca);
}
void proto_reg_handoff_mpeg_ca(void)
{
dissector_add_uint("mpeg_sect.tid", MPEG_CA_TID, mpeg_ca_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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