317 lines
11 KiB
C
317 lines
11 KiB
C
![]() |
/* packet-dvb-ait.c
|
||
|
* Routines for DVB Application Information Table (AIT) dissection
|
||
|
* Copyright 2012, Martin Kaiser <martin@kaiser.cx>
|
||
|
*
|
||
|
* $Id$
|
||
|
*
|
||
|
* Wireshark - Network traffic analyzer
|
||
|
* By Gerald Combs <gerald@wireshark.org>
|
||
|
* Copyright 1998 Gerald Combs
|
||
|
*
|
||
|
* 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.
|
||
|
*/
|
||
|
|
||
|
/* This dissector processes a DVB Application Information Table (AIT) as
|
||
|
* defined in ETSI TS 102 809. */
|
||
|
|
||
|
#ifdef HAVE_CONFIG_H
|
||
|
# include "config.h"
|
||
|
#endif
|
||
|
|
||
|
#include <glib.h>
|
||
|
#include <epan/packet.h>
|
||
|
|
||
|
#include "packet-mpeg-sect.h"
|
||
|
#include "packet-mpeg-descriptor.h"
|
||
|
|
||
|
static int proto_dvb_ait = -1;
|
||
|
|
||
|
static gint ett_dvb_ait = -1;
|
||
|
static gint ett_dvb_ait_descr = -1;
|
||
|
static gint ett_dvb_ait_app = -1;
|
||
|
|
||
|
static int hf_dvb_ait_test_app_flag = -1;
|
||
|
static int hf_dvb_ait_app_type = -1;
|
||
|
static int hf_dvb_ait_version_number = -1;
|
||
|
static int hf_dvb_ait_current_next_indicator = -1;
|
||
|
static int hf_dvb_ait_section_number = -1;
|
||
|
static int hf_dvb_ait_last_section_number = -1;
|
||
|
static int hf_dvb_ait_descr_loop_len = -1;
|
||
|
static int hf_dvb_ait_descr_tag = -1;
|
||
|
static int hf_dvb_ait_descr_len = -1;
|
||
|
static int hf_dvb_ait_descr_data = -1;
|
||
|
static int hf_dvb_ait_app_loop_len = -1;
|
||
|
static int hf_dvb_ait_org_id = -1;
|
||
|
static int hf_dvb_ait_app_id = -1;
|
||
|
static int hf_dvb_ait_app_ctrl_code = -1;
|
||
|
|
||
|
#define DVB_AIT_TID 0x74
|
||
|
|
||
|
static const value_string app_ctrl_code[] = {
|
||
|
{ 0x01, "Autostart" },
|
||
|
{ 0x02, "Present" },
|
||
|
{ 0x03, "Destroy" },
|
||
|
{ 0x04, "Kill" },
|
||
|
{ 0x05, "Prefetch" },
|
||
|
{ 0x06, "Remote" },
|
||
|
{ 0x07, "Disabled" },
|
||
|
{ 0x08, "Playback autostart" },
|
||
|
{ 0, NULL }
|
||
|
};
|
||
|
|
||
|
/* tags of the descriptors defined in ETSI TS 102 809
|
||
|
some of these tags are conflicting with MPEG2 or DVB-SI definitions,
|
||
|
therefore these descriptors aren't supported by packet-mpeg-descriptor.c */
|
||
|
static const value_string ait_descr_tag[] = {
|
||
|
{ 0x00, "Application descriptor" },
|
||
|
{ 0x01, "Application name descriptor" },
|
||
|
{ 0x02, "Transport protocol descriptor" },
|
||
|
{ 0x05, "External application authorization descriptor" },
|
||
|
{ 0x06, "Application recording descriptor" },
|
||
|
{ 0x0B, "Application icons descriptor" },
|
||
|
{ 0x10, "Application storage descriptor" },
|
||
|
{ 0x14, "Graphics constraints descriptor" },
|
||
|
{ 0x15, "Simple application location descriptor" },
|
||
|
{ 0x17, "Simple application boundary descriptor" },
|
||
|
{ 0x6F, "Application signalling descriptor" },
|
||
|
{ 0, NULL }
|
||
|
};
|
||
|
|
||
|
static gint
|
||
|
dissect_dvb_ait_descriptor(tvbuff_t *tvb, guint offset,
|
||
|
packet_info *pinfo _U_, proto_tree *tree)
|
||
|
{
|
||
|
gint ret = 0;
|
||
|
guint offset_start;
|
||
|
guint8 tag, len;
|
||
|
proto_item *descr_tree_ti = NULL;
|
||
|
proto_tree *descr_tree = NULL;
|
||
|
|
||
|
tag = tvb_get_guint8(tvb, offset);
|
||
|
len = tvb_get_guint8(tvb, offset+1);
|
||
|
|
||
|
/* if the descriptor is a special one that's defined in ETSI TS 102 809,
|
||
|
we dissect it ourselves
|
||
|
otherwise, we assume it's a generic DVB-SI descriptor and pass it
|
||
|
on to packet-mpeg-descriptor */
|
||
|
if (match_strval(tag, ait_descr_tag)) {
|
||
|
|
||
|
offset_start = offset;
|
||
|
descr_tree_ti = proto_tree_add_text(tree, tvb, offset_start, len+2,
|
||
|
"Descriptor Tag=0x%02x", tag);
|
||
|
descr_tree = proto_item_add_subtree(descr_tree_ti, ett_dvb_ait_descr);
|
||
|
|
||
|
proto_tree_add_item(descr_tree, hf_dvb_ait_descr_tag,
|
||
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
||
|
offset++;
|
||
|
proto_tree_add_item(descr_tree, hf_dvb_ait_descr_len,
|
||
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
||
|
offset++;
|
||
|
proto_tree_add_item(descr_tree, hf_dvb_ait_descr_data,
|
||
|
tvb, offset, len, ENC_NA);
|
||
|
offset += len;
|
||
|
|
||
|
ret = (gint)(offset-offset_start);
|
||
|
}
|
||
|
else
|
||
|
ret = (gint)proto_mpeg_descriptor_dissect(tvb, offset, tree);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
|
||
|
static int
|
||
|
dissect_dvb_ait(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
||
|
{
|
||
|
gint offset=0;
|
||
|
proto_item *ait_tree_ti = NULL, *app_tree_ti = NULL;
|
||
|
proto_tree *ait_tree = NULL, *ait_app_tree = NULL;
|
||
|
gint offset_loop_start, offset_inner_loop_start, offset_app_start;
|
||
|
guint16 descr_loop_len, app_loop_len;
|
||
|
gint ret;
|
||
|
guint32 org_id;
|
||
|
guint16 app_id;
|
||
|
|
||
|
col_clear(pinfo->cinfo, COL_INFO);
|
||
|
col_set_str(pinfo->cinfo, COL_INFO, "Application Information Table (AIT)");
|
||
|
|
||
|
if (tree) {
|
||
|
ait_tree_ti = proto_tree_add_protocol_format(tree, proto_dvb_ait,
|
||
|
tvb, 0, -1, "Application Information Table (AIT)");
|
||
|
ait_tree = proto_item_add_subtree(ait_tree_ti, ett_dvb_ait);
|
||
|
}
|
||
|
|
||
|
offset += packet_mpeg_sect_header(tvb, offset, ait_tree, NULL, NULL);
|
||
|
|
||
|
proto_tree_add_item(ait_tree, hf_dvb_ait_test_app_flag,
|
||
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
||
|
proto_tree_add_item(ait_tree, hf_dvb_ait_app_type,
|
||
|
tvb, offset, 2, ENC_BIG_ENDIAN);
|
||
|
offset += 2;
|
||
|
|
||
|
/* no hf for reserved bits */
|
||
|
proto_tree_add_item(ait_tree, hf_dvb_ait_version_number,
|
||
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
||
|
proto_tree_add_item(ait_tree, hf_dvb_ait_current_next_indicator,
|
||
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
||
|
offset++;
|
||
|
|
||
|
proto_tree_add_item(ait_tree, hf_dvb_ait_section_number,
|
||
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
||
|
offset++;
|
||
|
|
||
|
proto_tree_add_item(ait_tree, hf_dvb_ait_last_section_number,
|
||
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
||
|
offset++;
|
||
|
|
||
|
descr_loop_len = tvb_get_ntohs(tvb, offset) & 0x0FFF;
|
||
|
proto_tree_add_item(ait_tree, hf_dvb_ait_descr_loop_len,
|
||
|
tvb, offset, 2, ENC_BIG_ENDIAN);
|
||
|
offset += 2;
|
||
|
offset_loop_start = offset;
|
||
|
while (offset-offset_loop_start < descr_loop_len) {
|
||
|
ret = dissect_dvb_ait_descriptor(tvb, offset, pinfo, ait_tree);
|
||
|
if (ret<=0)
|
||
|
break;
|
||
|
offset += ret;
|
||
|
}
|
||
|
|
||
|
app_loop_len = tvb_get_ntohs(tvb, offset) & 0x0FFF;
|
||
|
proto_tree_add_item(ait_tree, hf_dvb_ait_app_loop_len,
|
||
|
tvb, offset, 2, ENC_BIG_ENDIAN);
|
||
|
offset += 2;
|
||
|
offset_loop_start = offset;
|
||
|
while (offset-offset_loop_start < app_loop_len) {
|
||
|
offset_app_start = offset;
|
||
|
org_id = tvb_get_ntohl(tvb, offset);
|
||
|
app_id = tvb_get_ntohs(tvb, offset+4);
|
||
|
app_tree_ti = proto_tree_add_text(ait_tree, tvb, offset, -1,
|
||
|
"Application: Org 0x%x, App 0x%x", org_id, app_id);
|
||
|
ait_app_tree = proto_item_add_subtree(app_tree_ti, ett_dvb_ait_app);
|
||
|
|
||
|
proto_tree_add_item(ait_app_tree, hf_dvb_ait_org_id,
|
||
|
tvb, offset, 4, ENC_BIG_ENDIAN);
|
||
|
offset += 4;
|
||
|
proto_tree_add_item(ait_app_tree, hf_dvb_ait_app_id,
|
||
|
tvb, offset, 2, ENC_BIG_ENDIAN);
|
||
|
offset += 2;
|
||
|
proto_tree_add_item(ait_app_tree, hf_dvb_ait_app_ctrl_code,
|
||
|
tvb, offset, 1, ENC_BIG_ENDIAN);
|
||
|
offset++;
|
||
|
descr_loop_len = tvb_get_ntohs(tvb, offset) & 0x0FFF;
|
||
|
proto_tree_add_item(ait_app_tree, hf_dvb_ait_descr_loop_len,
|
||
|
tvb, offset, 2, ENC_BIG_ENDIAN);
|
||
|
offset += 2;
|
||
|
offset_inner_loop_start = offset;
|
||
|
while (offset-offset_inner_loop_start < descr_loop_len) {
|
||
|
ret = dissect_dvb_ait_descriptor(tvb, offset, pinfo, ait_app_tree);
|
||
|
if (ret<=0)
|
||
|
break;
|
||
|
offset += ret;
|
||
|
}
|
||
|
proto_item_set_len(app_tree_ti, offset-offset_app_start);
|
||
|
}
|
||
|
|
||
|
offset += packet_mpeg_sect_crc(tvb, pinfo, ait_tree, 0, offset);
|
||
|
|
||
|
proto_item_set_len(ait_tree_ti, offset);
|
||
|
|
||
|
return offset;
|
||
|
}
|
||
|
|
||
|
void
|
||
|
proto_register_dvb_ait(void)
|
||
|
{
|
||
|
static gint *ett[] = {
|
||
|
&ett_dvb_ait,
|
||
|
&ett_dvb_ait_descr,
|
||
|
&ett_dvb_ait_app
|
||
|
};
|
||
|
|
||
|
static hf_register_info hf[] = {
|
||
|
{ &hf_dvb_ait_test_app_flag,
|
||
|
{ "Test application flag", "dvb_ait.test_app_flag",
|
||
|
FT_UINT8, BASE_HEX, NULL, 0x80, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_app_type,
|
||
|
{ "Application type", "dvb_ait.app_type",
|
||
|
FT_UINT16, BASE_HEX, NULL, 0x7FFF, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_version_number,
|
||
|
{ "Version Number", "dvb_ait.version",
|
||
|
FT_UINT8, BASE_HEX, NULL, 0x3E, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_current_next_indicator,
|
||
|
{ "Current/Next Indicator", "dvb_ait.cur_next_ind",
|
||
|
FT_UINT8, BASE_DEC, NULL, 0x01, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_section_number,
|
||
|
{ "Section Number", "dvb_ait.sect_num",
|
||
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_last_section_number,
|
||
|
{ "Last Section Number", "dvb_ait.last_sect_num",
|
||
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_descr_loop_len,
|
||
|
{ "Descriptor loop length", "dvb_ait.descr_loop_len",
|
||
|
FT_UINT16, BASE_DEC, NULL, 0x0FFF, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_descr_tag,
|
||
|
{ "Descriptor Tag", "dvb_ait.descr.tag",
|
||
|
FT_UINT8, BASE_HEX, VALS(ait_descr_tag), 0, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_descr_len,
|
||
|
{ "Descriptor Length", "dvb_ait.descr.len",
|
||
|
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_descr_data,
|
||
|
{ "Descriptor Data", "dvb_ait.descr.data",
|
||
|
FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_app_loop_len,
|
||
|
{ "Application loop length", "dvb_ait.app_loop_len",
|
||
|
FT_UINT16, BASE_DEC, NULL, 0x0FFF, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_org_id,
|
||
|
{ "Organisation ID", "dvb_ait.app.org_id",
|
||
|
FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_app_id,
|
||
|
{ "Application ID", "dvb_ait.app.app_id",
|
||
|
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL } },
|
||
|
{ &hf_dvb_ait_app_ctrl_code,
|
||
|
{ "Application control code", "dvb_ait.app.ctrl_code",
|
||
|
FT_UINT8, BASE_HEX, VALS(app_ctrl_code), 0, NULL, HFILL } }
|
||
|
};
|
||
|
|
||
|
proto_dvb_ait = proto_register_protocol(
|
||
|
"DVB Application Information Table", "DVB AIT", "dvb_ait");
|
||
|
|
||
|
proto_register_field_array(proto_dvb_ait, hf, array_length(hf));
|
||
|
proto_register_subtree_array(ett, array_length(ett));
|
||
|
}
|
||
|
|
||
|
|
||
|
void
|
||
|
proto_reg_handoff_dvb_ait(void)
|
||
|
{
|
||
|
dissector_handle_t dvb_ait_handle;
|
||
|
|
||
|
dvb_ait_handle = new_create_dissector_handle(dissect_dvb_ait, proto_dvb_ait);
|
||
|
dissector_add_uint("mpeg_sect.tid", DVB_AIT_TID, dvb_ait_handle);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Editor modelines - http://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:
|
||
|
*/
|