/* packet-dvb-ait.c * Routines for DVB Application Information Table (AIT) dissection * Copyright 2012, Martin Kaiser * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * 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 #include #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: */