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/* packet-mpeg-sect.c
* Routines for MPEG2 (ISO/ISO 13818-1) Section dissection
* Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Copied from WHATEVER_FILE_YOU_USED (where "WHATEVER_FILE_YOU_USED"
* is a dissector file; if you just copied this from README.developer,
* don't bother with the "Copied from" - you don't even need to put
* in a "Copied from" if you copied an existing dissector, especially
* if the bulk of the code in the new dissector is your code)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/prefs.h>
static int proto_mpeg_sect = -1;
static int hf_mpeg_sect_table_id = -1;
static int hf_mpeg_sect_syntax_indicator = -1;
static int hf_mpeg_sect_zero = -1;
static int hf_mpeg_sect_reserved = -1;
static int hf_mpeg_sect_length = -1;
static int hf_mpeg_sect_crc = -1;
static gint ett_mpeg_sect = -1;
static dissector_table_t mpeg_sect_tid_dissector_table;
#define MPEG_SECT_TABLE_ID_MASK 0xFF0000
#define MPEG_SECT_SYNTAX_INDICATOR_MASK 0x008000
#define MPEG_SECT_ZERO_MASK 0x004000
#define MPEG_SECT_RESERVED_MASK 0x003000
#define MPEG_SECT_LENGTH_MASK 0x000FFF
/* From ISO/IEC 13818-1 */
enum {
TID_PAT,
TID_CA,
TID_PMT,
TID_TS_DESC,
TID_SCENE_DESC,
TID_OBJECT_DESC,
TID_FORBIDEN = 0xFF,
};
/* From ETSI EN 300 468 */
enum {
TID_NIT = 0x40,
TID_NIT_OTHER,
TID_SDT,
TID_SDT_OTHER = 0x46,
TID_BAT = 0x4A,
TID_EIT = 0x4E,
TID_EIT_OTHER,
TID_TDT = 0x70,
TID_RST,
TID_ST,
TID_TOT,
};
/* From ETSI EN 301 790 */
enum {
TID_RMT = 0x41, /* Conflict with TID_NIT_OTHER */
TID_SCT = 0xA0,
TID_FCT,
TID_TCT,
TID_SPT,
TID_CMT,
TID_TBTP,
TID_PCR,
TID_TIM = 0xB0,
};
/* From ESTI EN 301 192 */
enum {
TID_DVB_MPE = 0x3E
};
static const value_string mpeg_sect_table_id_vals[] = {
{ TID_PAT, "Program Association Table (PAT)" },
{ TID_CA, "Conditional Access (CA)" },
{ TID_PMT, "Program Map Table (PMT)" },
{ TID_TS_DESC, "Transport Stream Description" },
{ TID_SCENE_DESC, "ISO/IEC 14496 Scene Description" },
{ TID_OBJECT_DESC, "ISO/IEC 14496 Object Description" },
{ TID_NIT, "Network Information Table (NIT), current network" },
{ TID_NIT_OTHER, "Network Information Table (NIT), other network" },
{ TID_SDT, "Service Description Table (SDT), current network" },
{ TID_SDT_OTHER, "Service Description (SDT), other network" },
{ TID_BAT, "Bouquet Associatoin Table (BAT)" },
{ TID_EIT, "Event Information Table (EIT), actual TS" },
{ TID_EIT_OTHER, "Event Information Table (EIT), other TS" },
{ TID_TDT, "Time and Date Table (TDT)" },
{ TID_RST, "Running Status Table (RST)" },
{ TID_ST, "Stuffing Table (ST)" },
{ TID_TOT, "Time Offset Table (TOT)" },
{ TID_SCT, "Superframe Composition Table (SCT)" },
{ TID_FCT, "Frame Composition Table (FCT)" },
{ TID_TCT, "Time-Slot Composition Table (TCT)" },
{ TID_SPT, "Satellite Position Table (SPT)" },
{ TID_CMT, "Correction Message Table (CMT)" },
{ TID_TBTP, "Terminal Burst Time Plan (TBTP)" },
{ TID_TIM, "Terminal Information Message (TIM)" },
{ TID_DVB_MPE, "DVB MultiProtocol Encapsulation (MPE)" },
{ TID_FORBIDEN, "Forbidden" },
{ 0, NULL }
};
void
dissect_mpeg_sect(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
gint offset = 0;
guint8 table_id = 0;
guint16 header = 0;
guint16 section_length = 0;
guint16 syntax_indicator = 0;
proto_item *ti = NULL;
proto_tree *mpeg_sect_tree = NULL;
tvbuff_t *pload_tvb = NULL;
table_id = tvb_get_guint8(tvb, offset);
header = tvb_get_ntohs(tvb, offset + 1);
syntax_indicator = header & MPEG_SECT_SYNTAX_INDICATOR_MASK;
section_length = header & MPEG_SECT_LENGTH_MASK;
set_actual_length(tvb, section_length + 3);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MPEG SECT");
col_add_fstr(pinfo->cinfo, COL_INFO, "Table ID 0x%08x", table_id);
ti = proto_tree_add_item(tree, proto_mpeg_sect, tvb, offset, -1, ENC_NA);
mpeg_sect_tree = proto_item_add_subtree(ti, ett_mpeg_sect);
proto_item_append_text(ti, " Table_ID=0x%08x", table_id);
if (syntax_indicator) {
/* Pass everything but the CRC */
section_length -= sizeof(guint32);
}
if (tree) {
proto_tree_add_item(mpeg_sect_tree, hf_mpeg_sect_table_id, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_sect_tree, hf_mpeg_sect_syntax_indicator, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_sect_tree, hf_mpeg_sect_zero, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_sect_tree, hf_mpeg_sect_reserved, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_sect_tree, hf_mpeg_sect_length, tvb, offset, 3, ENC_BIG_ENDIAN);
offset += 3;
if (syntax_indicator)
proto_tree_add_item(mpeg_sect_tree, hf_mpeg_sect_crc, tvb, offset + section_length, 4, ENC_BIG_ENDIAN);
}
pload_tvb = tvb_new_subset(tvb, 3, section_length, -1);
dissector_try_uint(mpeg_sect_tid_dissector_table, table_id, pload_tvb, pinfo, tree);
return;
}
static gboolean
heur_dissect_mpeg_sect(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint16 section_length = 0;
section_length = (tvb_get_ntohs(tvb, 1) & MPEG_SECT_LENGTH_MASK) + 3;
if (tvb_length_remaining(tvb, 0) < section_length)
return FALSE;
dissect_mpeg_sect(tvb, pinfo, tree);
return TRUE;
}
void
proto_register_mpeg_sect(void)
{
static hf_register_info hf[] = {
{ &hf_mpeg_sect_table_id, {
"Table ID", "mpeg_sect.tid",
FT_UINT24, BASE_HEX, VALS(mpeg_sect_table_id_vals), MPEG_SECT_TABLE_ID_MASK, NULL, HFILL
} },
{ &hf_mpeg_sect_syntax_indicator, {
"Syntax indicator", "mpeg_sect.syntax_indicator",
FT_UINT24, BASE_DEC, NULL, MPEG_SECT_SYNTAX_INDICATOR_MASK, NULL, HFILL
} },
{ &hf_mpeg_sect_zero, {
"Zero or reserved", "mpeg_sect.zero",
FT_UINT24, BASE_DEC, NULL, MPEG_SECT_ZERO_MASK, NULL, HFILL
} },
{ &hf_mpeg_sect_reserved, {
"Reserved", "mpeg_sect.reserved",
FT_UINT24, BASE_HEX, NULL, MPEG_SECT_RESERVED_MASK, NULL, HFILL
} },
{ &hf_mpeg_sect_length, {
"Length", "mpeg_sect.len",
FT_UINT24, BASE_DEC, NULL, MPEG_SECT_LENGTH_MASK, NULL, HFILL
} },
{ &hf_mpeg_sect_crc, {
"CRC 32", "mpeg_sect.crc",
FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL
} },
};
static gint *ett[] = {
&ett_mpeg_sect
};
proto_mpeg_sect = proto_register_protocol("MPEG2 Section", "MPEG SECT", "mpeg_sect");
register_dissector("mpeg_sect", dissect_mpeg_sect, proto_mpeg_sect);
proto_register_field_array(proto_mpeg_sect, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
mpeg_sect_tid_dissector_table = register_dissector_table("mpeg_sect.tid", "MPEG SECT Table ID", FT_UINT8, BASE_HEX);
}
void
proto_reg_handoff_mpeg_sect(void)
{
heur_dissector_add("mp2t.pid", heur_dissect_mpeg_sect, proto_mpeg_sect);
}
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