317 lines
11 KiB
C
317 lines
11 KiB
C
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/* packet-dvb-ait.c
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* Routines for DVB Application Information Table (AIT) dissection
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* Copyright 2012, Martin Kaiser <martin@kaiser.cx>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* This dissector processes a DVB Application Information Table (AIT) as
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* defined in ETSI TS 102 809. */
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include "packet-mpeg-sect.h"
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#include "packet-mpeg-descriptor.h"
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static int proto_dvb_ait = -1;
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static gint ett_dvb_ait = -1;
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static gint ett_dvb_ait_descr = -1;
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static gint ett_dvb_ait_app = -1;
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static int hf_dvb_ait_test_app_flag = -1;
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static int hf_dvb_ait_app_type = -1;
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static int hf_dvb_ait_version_number = -1;
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static int hf_dvb_ait_current_next_indicator = -1;
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static int hf_dvb_ait_section_number = -1;
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static int hf_dvb_ait_last_section_number = -1;
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static int hf_dvb_ait_descr_loop_len = -1;
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static int hf_dvb_ait_descr_tag = -1;
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static int hf_dvb_ait_descr_len = -1;
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static int hf_dvb_ait_descr_data = -1;
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static int hf_dvb_ait_app_loop_len = -1;
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static int hf_dvb_ait_org_id = -1;
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static int hf_dvb_ait_app_id = -1;
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static int hf_dvb_ait_app_ctrl_code = -1;
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#define DVB_AIT_TID 0x74
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static const value_string app_ctrl_code[] = {
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{ 0x01, "Autostart" },
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{ 0x02, "Present" },
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{ 0x03, "Destroy" },
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{ 0x04, "Kill" },
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{ 0x05, "Prefetch" },
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{ 0x06, "Remote" },
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{ 0x07, "Disabled" },
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{ 0x08, "Playback autostart" },
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{ 0, NULL }
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};
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/* tags of the descriptors defined in ETSI TS 102 809
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some of these tags are conflicting with MPEG2 or DVB-SI definitions,
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therefore these descriptors aren't supported by packet-mpeg-descriptor.c */
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static const value_string ait_descr_tag[] = {
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{ 0x00, "Application descriptor" },
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{ 0x01, "Application name descriptor" },
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{ 0x02, "Transport protocol descriptor" },
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{ 0x05, "External application authorization descriptor" },
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{ 0x06, "Application recording descriptor" },
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{ 0x0B, "Application icons descriptor" },
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{ 0x10, "Application storage descriptor" },
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{ 0x14, "Graphics constraints descriptor" },
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{ 0x15, "Simple application location descriptor" },
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{ 0x17, "Simple application boundary descriptor" },
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{ 0x6F, "Application signalling descriptor" },
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{ 0, NULL }
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};
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static gint
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dissect_dvb_ait_descriptor(tvbuff_t *tvb, guint offset,
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packet_info *pinfo _U_, proto_tree *tree)
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{
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gint ret = 0;
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guint offset_start;
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guint8 tag, len;
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proto_item *descr_tree_ti = NULL;
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proto_tree *descr_tree = NULL;
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tag = tvb_get_guint8(tvb, offset);
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len = tvb_get_guint8(tvb, offset+1);
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/* if the descriptor is a special one that's defined in ETSI TS 102 809,
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we dissect it ourselves
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otherwise, we assume it's a generic DVB-SI descriptor and pass it
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on to packet-mpeg-descriptor */
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if (match_strval(tag, ait_descr_tag)) {
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offset_start = offset;
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descr_tree_ti = proto_tree_add_text(tree, tvb, offset_start, len+2,
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"Descriptor Tag=0x%02x", tag);
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descr_tree = proto_item_add_subtree(descr_tree_ti, ett_dvb_ait_descr);
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proto_tree_add_item(descr_tree, hf_dvb_ait_descr_tag,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(descr_tree, hf_dvb_ait_descr_len,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(descr_tree, hf_dvb_ait_descr_data,
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tvb, offset, len, ENC_NA);
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offset += len;
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ret = (gint)(offset-offset_start);
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}
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else
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ret = (gint)proto_mpeg_descriptor_dissect(tvb, offset, tree);
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return ret;
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}
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static int
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dissect_dvb_ait(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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gint offset=0;
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proto_item *ait_tree_ti = NULL, *app_tree_ti = NULL;
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proto_tree *ait_tree = NULL, *ait_app_tree = NULL;
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gint offset_loop_start, offset_inner_loop_start, offset_app_start;
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guint16 descr_loop_len, app_loop_len;
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gint ret;
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guint32 org_id;
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guint16 app_id;
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col_clear(pinfo->cinfo, COL_INFO);
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col_set_str(pinfo->cinfo, COL_INFO, "Application Information Table (AIT)");
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if (tree) {
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ait_tree_ti = proto_tree_add_protocol_format(tree, proto_dvb_ait,
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tvb, 0, -1, "Application Information Table (AIT)");
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ait_tree = proto_item_add_subtree(ait_tree_ti, ett_dvb_ait);
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}
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offset += packet_mpeg_sect_header(tvb, offset, ait_tree, NULL, NULL);
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proto_tree_add_item(ait_tree, hf_dvb_ait_test_app_flag,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(ait_tree, hf_dvb_ait_app_type,
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tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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/* no hf for reserved bits */
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proto_tree_add_item(ait_tree, hf_dvb_ait_version_number,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(ait_tree, hf_dvb_ait_current_next_indicator,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(ait_tree, hf_dvb_ait_section_number,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(ait_tree, hf_dvb_ait_last_section_number,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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descr_loop_len = tvb_get_ntohs(tvb, offset) & 0x0FFF;
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proto_tree_add_item(ait_tree, hf_dvb_ait_descr_loop_len,
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tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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offset_loop_start = offset;
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while (offset-offset_loop_start < descr_loop_len) {
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ret = dissect_dvb_ait_descriptor(tvb, offset, pinfo, ait_tree);
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if (ret<=0)
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break;
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offset += ret;
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}
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app_loop_len = tvb_get_ntohs(tvb, offset) & 0x0FFF;
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proto_tree_add_item(ait_tree, hf_dvb_ait_app_loop_len,
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tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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offset_loop_start = offset;
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while (offset-offset_loop_start < app_loop_len) {
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offset_app_start = offset;
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org_id = tvb_get_ntohl(tvb, offset);
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app_id = tvb_get_ntohs(tvb, offset+4);
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app_tree_ti = proto_tree_add_text(ait_tree, tvb, offset, -1,
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"Application: Org 0x%x, App 0x%x", org_id, app_id);
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ait_app_tree = proto_item_add_subtree(app_tree_ti, ett_dvb_ait_app);
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proto_tree_add_item(ait_app_tree, hf_dvb_ait_org_id,
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tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(ait_app_tree, hf_dvb_ait_app_id,
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tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(ait_app_tree, hf_dvb_ait_app_ctrl_code,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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descr_loop_len = tvb_get_ntohs(tvb, offset) & 0x0FFF;
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proto_tree_add_item(ait_app_tree, hf_dvb_ait_descr_loop_len,
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tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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offset_inner_loop_start = offset;
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while (offset-offset_inner_loop_start < descr_loop_len) {
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ret = dissect_dvb_ait_descriptor(tvb, offset, pinfo, ait_app_tree);
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if (ret<=0)
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break;
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offset += ret;
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}
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proto_item_set_len(app_tree_ti, offset-offset_app_start);
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}
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offset += packet_mpeg_sect_crc(tvb, pinfo, ait_tree, 0, offset);
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proto_item_set_len(ait_tree_ti, offset);
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return offset;
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}
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void
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proto_register_dvb_ait(void)
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{
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static gint *ett[] = {
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&ett_dvb_ait,
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&ett_dvb_ait_descr,
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&ett_dvb_ait_app
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};
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static hf_register_info hf[] = {
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{ &hf_dvb_ait_test_app_flag,
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{ "Test application flag", "dvb_ait.test_app_flag",
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FT_UINT8, BASE_HEX, NULL, 0x80, NULL, HFILL } },
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{ &hf_dvb_ait_app_type,
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{ "Application type", "dvb_ait.app_type",
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FT_UINT16, BASE_HEX, NULL, 0x7FFF, NULL, HFILL } },
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{ &hf_dvb_ait_version_number,
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{ "Version Number", "dvb_ait.version",
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FT_UINT8, BASE_HEX, NULL, 0x3E, NULL, HFILL } },
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{ &hf_dvb_ait_current_next_indicator,
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{ "Current/Next Indicator", "dvb_ait.cur_next_ind",
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FT_UINT8, BASE_DEC, NULL, 0x01, NULL, HFILL } },
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{ &hf_dvb_ait_section_number,
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{ "Section Number", "dvb_ait.sect_num",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_dvb_ait_last_section_number,
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{ "Last Section Number", "dvb_ait.last_sect_num",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_dvb_ait_descr_loop_len,
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{ "Descriptor loop length", "dvb_ait.descr_loop_len",
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FT_UINT16, BASE_DEC, NULL, 0x0FFF, NULL, HFILL } },
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{ &hf_dvb_ait_descr_tag,
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{ "Descriptor Tag", "dvb_ait.descr.tag",
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FT_UINT8, BASE_HEX, VALS(ait_descr_tag), 0, NULL, HFILL } },
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{ &hf_dvb_ait_descr_len,
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{ "Descriptor Length", "dvb_ait.descr.len",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } },
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{ &hf_dvb_ait_descr_data,
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{ "Descriptor Data", "dvb_ait.descr.data",
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FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL } },
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{ &hf_dvb_ait_app_loop_len,
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{ "Application loop length", "dvb_ait.app_loop_len",
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FT_UINT16, BASE_DEC, NULL, 0x0FFF, NULL, HFILL } },
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{ &hf_dvb_ait_org_id,
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{ "Organisation ID", "dvb_ait.app.org_id",
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FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL } },
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{ &hf_dvb_ait_app_id,
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{ "Application ID", "dvb_ait.app.app_id",
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FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL } },
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{ &hf_dvb_ait_app_ctrl_code,
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{ "Application control code", "dvb_ait.app.ctrl_code",
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FT_UINT8, BASE_HEX, VALS(app_ctrl_code), 0, NULL, HFILL } }
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};
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proto_dvb_ait = proto_register_protocol(
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"DVB Application Information Table", "DVB AIT", "dvb_ait");
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proto_register_field_array(proto_dvb_ait, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_dvb_ait(void)
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{
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dissector_handle_t dvb_ait_handle;
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dvb_ait_handle = new_create_dissector_handle(dissect_dvb_ait, proto_dvb_ait);
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dissector_add_uint("mpeg_sect.tid", DVB_AIT_TID, dvb_ait_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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