diff options
author | Pascal Quantin <pascal.quantin@gmail.com> | 2012-05-29 21:36:39 +0000 |
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committer | Pascal Quantin <pascal.quantin@gmail.com> | 2012-05-29 21:36:39 +0000 |
commit | 3f07cc05bcc816a2ff95466b023e3d9f4c7fe733 (patch) | |
tree | 0a464035d58de9b9a7fc4b894182064803c66c42 /epan/dissectors/packet-dvb-ait.c | |
parent | 0e557f4421ede21056234dee33523749d73de852 (diff) |
From Martin Kaiser via https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7301:
Dissector for DVB Application Information Table (AIT)
svn path=/trunk/; revision=42903
Diffstat (limited to 'epan/dissectors/packet-dvb-ait.c')
-rw-r--r-- | epan/dissectors/packet-dvb-ait.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/epan/dissectors/packet-dvb-ait.c b/epan/dissectors/packet-dvb-ait.c new file mode 100644 index 0000000000..f5a0916a80 --- /dev/null +++ b/epan/dissectors/packet-dvb-ait.c @@ -0,0 +1,316 @@ +/* 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: + */ |