![Martin Kaiser](/assets/img/avatar_default.png)
don't simply assume the PAT continues until the end of the input tvb this is similar to packet_dvb_ait.c I'll change this for other tables shortly svn path=/trunk/; revision=43969
204 lines
6.1 KiB
C
204 lines
6.1 KiB
C
/* packet-mpeg-pat.c
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* Routines for MPEG2 (ISO/ISO 13818-1) Program Associate Table (PAT) dissection
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* Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
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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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#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 <epan/prefs.h>
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#include <epan/dissectors/packet-mpeg-sect.h>
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static int proto_mpeg_pat = -1;
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static int hf_mpeg_pat_transport_stream_id = -1;
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static int hf_mpeg_pat_reserved = -1;
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static int hf_mpeg_pat_version_number = -1;
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static int hf_mpeg_pat_current_next_indicator = -1;
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static int hf_mpeg_pat_section_number = -1;
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static int hf_mpeg_pat_last_section_number = -1;
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static int hf_mpeg_pat_program_number = -1;
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static int hf_mpeg_pat_program_reserved = -1;
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static int hf_mpeg_pat_program_map_pid = -1;
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static gint ett_mpeg_pat = -1;
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static gint ett_mpeg_pat_prog = -1;
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#define MPEG_PAT_TID 0x00
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#define MPEG_PAT_RESERVED_MASK 0xC0
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#define MPEG_PAT_VERSION_NUMBER_MASK 0x3E
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#define MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK 0x01
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#define MPEG_PAT_PROGRAM_RESERVED_MASK 0xE000
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#define MPEG_PAT_PROGRAM_MAP_PID_MASK 0x1FFF
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static const true_false_string mpeg_pat_cur_next_vals = {
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"Currently applicable", "Not yet applicable"
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};
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static void
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dissect_mpeg_pat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint offset = 0, length = 0;
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guint16 prog_num = 0, prog_pid;
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proto_item *ti = NULL;
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proto_tree *mpeg_pat_tree = NULL;
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proto_item *pi = NULL;
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proto_tree *mpeg_pat_prog_tree = NULL;
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/* The TVB should start right after the section_length in the Section packet */
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col_clear(pinfo->cinfo, COL_INFO);
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col_set_str(pinfo->cinfo, COL_INFO, "Program Association Table (PAT)");
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ti = proto_tree_add_item(tree, proto_mpeg_pat, tvb, offset, -1, ENC_NA);
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mpeg_pat_tree = proto_item_add_subtree(ti, ett_mpeg_pat);
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offset += packet_mpeg_sect_header(tvb, offset, mpeg_pat_tree, &length, NULL);
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length -= 4;
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proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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if (offset >= length)
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return;
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/* Parse all the programs */
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while (offset < length) {
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prog_num = tvb_get_ntohs(tvb, offset);
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prog_pid = tvb_get_ntohs(tvb, offset + 2) & MPEG_PAT_PROGRAM_MAP_PID_MASK;
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pi = proto_tree_add_text(mpeg_pat_tree, tvb, offset, 4, "Program 0x%04hx -> PID 0x%04hx", prog_num, prog_pid);
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mpeg_pat_prog_tree = proto_item_add_subtree(pi, ett_mpeg_pat_prog);
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proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_number, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_map_pid, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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}
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offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_pat_tree, 0, offset);
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proto_item_set_len(ti, offset);
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}
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void
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proto_register_mpeg_pat(void)
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{
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static hf_register_info hf[] = {
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{ &hf_mpeg_pat_transport_stream_id, {
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"Transport Stream ID", "mpeg_pat.tsid",
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FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
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} },
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{ &hf_mpeg_pat_reserved, {
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"Reserved", "mpeg_pat.reserved",
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FT_UINT8, BASE_HEX, NULL, MPEG_PAT_RESERVED_MASK, NULL, HFILL
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} },
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{ &hf_mpeg_pat_version_number, {
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"Version Number", "mpeg_pat.version",
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FT_UINT8, BASE_HEX, NULL, MPEG_PAT_VERSION_NUMBER_MASK, NULL, HFILL
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} },
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{ &hf_mpeg_pat_current_next_indicator, {
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"Current/Next Indicator", "mpeg_pat.cur_next_ind",
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FT_BOOLEAN, 8, TFS(&mpeg_pat_cur_next_vals), MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
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} },
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{ &hf_mpeg_pat_section_number, {
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"Section Number", "mpeg_pat.sect_num",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
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} },
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{ &hf_mpeg_pat_last_section_number, {
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"Last Section Number", "mpeg_pat.last_sect_num",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
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} },
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{ &hf_mpeg_pat_program_number, {
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"Program Number", "mpeg_pat.prog_num",
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FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
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} },
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{ &hf_mpeg_pat_program_reserved, {
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"Reserved", "mpeg_pat.prog_reserved",
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FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_RESERVED_MASK, NULL, HFILL
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} },
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{ &hf_mpeg_pat_program_map_pid, {
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"Program Map PID", "mpeg_pat.prog_map_pid",
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FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_MAP_PID_MASK, NULL, HFILL
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} },
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};
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static gint *ett[] = {
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&ett_mpeg_pat,
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&ett_mpeg_pat_prog
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};
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proto_mpeg_pat = proto_register_protocol("MPEG2 Program Association Table", "MPEG PAT", "mpeg_pat");
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proto_register_field_array(proto_mpeg_pat, 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 proto_reg_handoff_mpeg_pat(void)
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{
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dissector_handle_t mpeg_pat_handle;
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mpeg_pat_handle = create_dissector_handle(dissect_mpeg_pat, proto_mpeg_pat);
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dissector_add_uint("mpeg_sect.tid", MPEG_PAT_TID, mpeg_pat_handle);
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}
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