/* packet-dvb-ait.c * Routines for DVB Application Information Table (AIT) dissection * Copyright 2012-2013, Martin Kaiser * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ /* This dissector processes a DVB Application Information Table (AIT) as * defined in ETSI TS 102 809. */ #include "config.h" #include #include "packet-mpeg-sect.h" #include "packet-mpeg-descriptor.h" void proto_register_dvb_ait(void); void proto_reg_handoff_dvb_ait(void); static dissector_handle_t dvb_ait_handle; static int proto_dvb_ait; static int ett_dvb_ait; static int ett_dvb_ait_descr; static int ett_dvb_ait_app; static int hf_dvb_ait_test_app_flag; static int hf_dvb_ait_app_type; static int hf_dvb_ait_version_number; static int hf_dvb_ait_current_next_indicator; static int hf_dvb_ait_section_number; static int hf_dvb_ait_last_section_number; static int hf_dvb_ait_descr_loop_len; static int hf_dvb_ait_descr_tag; static int hf_dvb_ait_descr_len; static int hf_dvb_ait_descr_data; static int hf_dvb_ait_descr_app_prof_len; static int hf_dvb_ait_descr_app_prof; static int hf_dvb_ait_descr_app_ver; static int hf_dvb_ait_descr_app_svc_bound; static int hf_dvb_ait_descr_app_vis; static int hf_dvb_ait_descr_app_prio; static int hf_dvb_ait_descr_app_trpt_proto_label; static int hf_dvb_ait_descr_app_name_lang; static int hf_dvb_ait_descr_app_name_name; static int hf_dvb_ait_descr_trpt_proto_id; static int hf_dvb_ait_descr_trpt_proto_label; static int hf_dvb_ait_descr_trpt_sel_remote; static int hf_dvb_ait_descr_trpt_sel_onid; static int hf_dvb_ait_descr_trpt_sel_tsid; static int hf_dvb_ait_descr_trpt_sel_svcid; static int hf_dvb_ait_descr_trpt_sel_comp; static int hf_dvb_ait_descr_trpt_sel_url_base; static int hf_dvb_ait_descr_trpt_sel_url_ext_cnt; static int hf_dvb_ait_descr_trpt_sel_url_ext; static int hf_dvb_ait_descr_trpt_sel_bytes; static int hf_dvb_ait_descr_sal_init_path; static int hf_dvb_ait_app_loop_len; static int hf_dvb_ait_org_id; static int hf_dvb_ait_app_id; static int hf_dvb_ait_app_ctrl_code; 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 */ #define AIT_DESCR_APP 0x00 #define AIT_DESCR_APP_NAME 0x01 #define AIT_DESCR_TRPT_PROTO 0x02 #define AIT_DESCR_EXT_APP_AUTH 0x05 #define AIT_DESCR_APP_REC 0x06 #define AIT_DESCR_APP_ICO 0x0B #define AIT_DESCR_APP_STOR 0x10 #define AIT_DESCR_GRA_CONST 0x14 #define AIT_DESCR_SIM_APP_LOC 0x15 #define AIT_DESCR_SIM_APP_BND 0x17 #define AIT_DESCR_APP_SIG 0x6F static const value_string ait_descr_tag[] = { { AIT_DESCR_APP, "Application descriptor" }, { AIT_DESCR_APP_NAME, "Application name descriptor" }, { AIT_DESCR_TRPT_PROTO, "Transport protocol descriptor" }, { AIT_DESCR_EXT_APP_AUTH, "External application authorization descriptor" }, { AIT_DESCR_APP_REC, "Application recording descriptor" }, { AIT_DESCR_APP_ICO, "Application icons descriptor" }, { AIT_DESCR_APP_STOR, "Application storage descriptor" }, { AIT_DESCR_GRA_CONST, "Graphics constraints descriptor" }, { AIT_DESCR_SIM_APP_LOC, "Simple application location descriptor" }, { AIT_DESCR_SIM_APP_BND, "Simple application boundary descriptor" }, { AIT_DESCR_APP_SIG, "Application signalling descriptor" }, { 0, NULL } }; #define TRPT_OBJ_CAROUSEL 0x0001 #define TRPT_HTTP 0x0003 static const value_string trpt_proto_id[] = { { TRPT_OBJ_CAROUSEL, "Object Carousel" }, { TRPT_HTTP, "Transport via HTTP" }, { 0, NULL } }; static const value_string app_vis[] = { { 0x0, "not visible" }, { 0x1, "not visible to users, only to applications" }, { 0x3, "fully visible" }, { 0, NULL } }; /* dissect the body of an application_descriptor offset points to the start of the body, i.e. to the first byte after the length field */ static int dissect_dvb_ait_app_desc_body(tvbuff_t *tvb, unsigned offset, uint8_t body_len, packet_info *pinfo _U_, proto_tree *tree) { unsigned offset_start, offset_app_prof_start; uint8_t app_prof_len; uint8_t ver_maj, ver_min, ver_mic; offset_start = offset; app_prof_len = tvb_get_uint8(tvb, offset); proto_tree_add_item(tree, hf_dvb_ait_descr_app_prof_len, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; offset_app_prof_start = offset; while (offset-offset_app_prof_start < app_prof_len) { proto_tree_add_item(tree, hf_dvb_ait_descr_app_prof, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; ver_maj = tvb_get_uint8(tvb, offset); ver_min = tvb_get_uint8(tvb, offset+1); ver_mic = tvb_get_uint8(tvb, offset+2); proto_tree_add_uint_format(tree, hf_dvb_ait_descr_app_ver, tvb, offset, 3, ver_maj<<16|ver_min<<8|ver_mic, "Version %d.%d.%d", ver_maj, ver_min, ver_mic); offset += 3; } proto_tree_add_item(tree, hf_dvb_ait_descr_app_svc_bound, tvb, offset, 1, ENC_BIG_ENDIAN); proto_tree_add_item(tree, hf_dvb_ait_descr_app_vis, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; proto_tree_add_item(tree, hf_dvb_ait_descr_app_prio, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; while (offset-offset_start < body_len) { proto_tree_add_item(tree, hf_dvb_ait_descr_app_trpt_proto_label, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; } return (int)(offset-offset_start); } static int dissect_dvb_ait_app_name_desc_body(tvbuff_t *tvb, unsigned offset, uint8_t body_len, packet_info *pinfo _U_, proto_tree *tree) { unsigned offset_start; uint8_t len; offset_start = offset; while (offset-offset_start < body_len) { proto_tree_add_item(tree, hf_dvb_ait_descr_app_name_lang, tvb, offset, 3, ENC_ASCII); offset += 3; len = tvb_get_uint8(tvb, offset); /* FT_UINT_STRING with 1 leading len byte */ proto_tree_add_item(tree, hf_dvb_ait_descr_app_name_name, tvb, offset, 1, ENC_ASCII|ENC_BIG_ENDIAN); offset += 1+len; } return (int)(offset-offset_start); } static int dissect_dvb_ait_trpt_proto_desc_body(tvbuff_t *tvb, unsigned offset, uint8_t body_len, packet_info *pinfo _U_, proto_tree *tree) { unsigned offset_start; uint16_t proto_id; bool remote_connection; offset_start = offset; proto_id = tvb_get_ntohs(tvb, offset); proto_tree_add_item(tree, hf_dvb_ait_descr_trpt_proto_id, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item(tree, hf_dvb_ait_descr_trpt_proto_label, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; if (offset-offset_start < body_len) { if (proto_id == TRPT_OBJ_CAROUSEL) { remote_connection = ((tvb_get_uint8(tvb, offset) & 0x80) == 0x80); proto_tree_add_item(tree, hf_dvb_ait_descr_trpt_sel_remote, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; if (remote_connection) { proto_tree_add_item(tree, hf_dvb_ait_descr_trpt_sel_onid, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item(tree, hf_dvb_ait_descr_trpt_sel_tsid, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item(tree, hf_dvb_ait_descr_trpt_sel_svcid, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; } proto_tree_add_item(tree, hf_dvb_ait_descr_trpt_sel_comp, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; } else if (proto_id == TRPT_HTTP) { uint8_t url_base_len, url_ext_cnt, url_ext_len, i; url_base_len = tvb_get_uint8(tvb, offset); /* FT_UINT_STRING with one leading length byte */ proto_tree_add_item(tree, hf_dvb_ait_descr_trpt_sel_url_base, tvb, offset, 1, ENC_ASCII|ENC_BIG_ENDIAN); offset += 1+url_base_len; url_ext_cnt = tvb_get_uint8(tvb, offset); proto_tree_add_item(tree, hf_dvb_ait_descr_trpt_sel_url_ext_cnt, tvb, offset, 1, ENC_BIG_ENDIAN); offset++; for (i=0; i0) offset += ret; break; case AIT_DESCR_APP_NAME: ret = dissect_dvb_ait_app_name_desc_body(tvb, offset, len, pinfo, descr_tree); if (ret>0) offset += ret; break; case AIT_DESCR_TRPT_PROTO: ret = dissect_dvb_ait_trpt_proto_desc_body(tvb, offset, len, pinfo, descr_tree); if (ret>0) offset += ret; break; case AIT_DESCR_SIM_APP_LOC: proto_tree_add_item(descr_tree, hf_dvb_ait_descr_sal_init_path, tvb, offset, len, ENC_ASCII); offset += len; break; default: proto_tree_add_item(descr_tree, hf_dvb_ait_descr_data, tvb, offset, len, ENC_NA); offset += len; break; } ret = (int)(offset-offset_start); } else ret = (int)proto_mpeg_descriptor_dissect(tvb, offset, tree); return ret; } static int dissect_dvb_ait(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) { int offset=0; proto_item *ait_tree_ti = NULL, *app_tree_ti = NULL; proto_tree *ait_tree = NULL, *ait_app_tree = NULL; int offset_loop_start, offset_inner_loop_start, offset_app_start; uint16_t descr_loop_len, app_loop_len; int ret; uint32_t org_id; uint16_t app_id; 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); ait_app_tree = proto_tree_add_subtree_format(ait_tree, tvb, offset, -1, ett_dvb_ait_app, &app_tree_ti, "Application: Org 0x%x, App 0x%x", org_id, app_id); 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 int *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_descr_app_prof_len, { "Application profiles length", "dvb_ait.descr.app.prof_len", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_app_prof, { "Application profile", "dvb_ait.descr.app.prof", FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL } }, /* version is major|minor|micro */ { &hf_dvb_ait_descr_app_ver, { "Version", "dvb_ait.descr.app.ver", FT_UINT24, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_app_svc_bound, { "Service-bound flag", "dvb_ait.descr.app.svc_bound_flag", FT_UINT8, BASE_HEX, NULL, 0x80, NULL, HFILL } }, { &hf_dvb_ait_descr_app_vis, { "Visibility", "dvb_ait.descr.app.visibility", FT_UINT8, BASE_HEX, VALS(app_vis), 0x60, NULL, HFILL } }, { &hf_dvb_ait_descr_app_prio, { "Application priority", "dvb_ait.descr.app.prio", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_app_trpt_proto_label, { "Transport protocol label", "dvb_ait.descr.app.trpt_proto_label", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_app_name_lang, { "ISO 639 language code", "dvb_ait.descr.app_name.lang", FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_app_name_name, { "Application name", "dvb_ait.descr.app_name.name", FT_UINT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_proto_id, { "Protocol ID", "dvb_ait.descr.trpt_proto.id", FT_UINT16, BASE_HEX, VALS(trpt_proto_id), 0, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_proto_label, { "Transport protocol label", "dvb_ait.descr.trpt_proto.label", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_sel_remote, { "Remote connection", "dvb_ait.descr.trpt_proto.remote", FT_UINT8, BASE_HEX, NULL, 0x80, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_sel_onid, { "Original network ID", "dvb_ait.descr.trpt_proto.onid", FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_sel_tsid, { "Transport stream ID", "dvb_ait.descr.trpt_proto.tsid", FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_sel_svcid, { "Service ID", "dvb_ait.descr.trpt_proto.svcid", FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_sel_comp, { "Component tag", "dvb_ait.descr.trpt_proto.comp_tag", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_sel_url_base, { "URL base", "dvb_ait.descr.trpt_proto.url_base", FT_UINT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_sel_url_ext_cnt, { "URL extension count", "dvb_ait.descr.trpt_proto.url_ext_cnt", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_sel_url_ext, { "URL extension", "dvb_ait.descr.trpt_proto.url_ext", FT_UINT_STRING, BASE_NONE, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_trpt_sel_bytes, { "Selector bytes", "dvb_ait.descr.trpt_proto.selector_bytes", FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL } }, { &hf_dvb_ait_descr_sal_init_path, { "Initial path", "dvb_ait.descr.sim_app_loc.initial_path", FT_STRING, 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)); dvb_ait_handle = register_dissector("dvb_ait", dissect_dvb_ait, proto_dvb_ait); } void proto_reg_handoff_dvb_ait(void) { dissector_add_uint("mpeg_sect.tid", DVB_AIT_TID, dvb_ait_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: */