forked from osmocom/wireshark
193 lines
6.0 KiB
C
193 lines
6.0 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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* 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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include "packet-mpeg-sect.h"
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void proto_register_mpeg_pat(void);
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void proto_reg_handoff_mpeg_pat(void);
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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_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 int
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dissect_mpeg_pat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint offset = 0, length = 0;
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guint16 prog_num, prog_pid;
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proto_item *ti;
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proto_tree *mpeg_pat_tree;
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proto_tree *mpeg_pat_prog_tree;
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/* The TVB should start right after the section_length in the Section packet */
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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 += 1;
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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 += 1;
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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 += 1;
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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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mpeg_pat_prog_tree = proto_tree_add_subtree_format(mpeg_pat_tree, tvb, offset, 4,
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ett_mpeg_pat_prog, NULL, "Program 0x%04hx -> PID 0x%04hx", prog_num, prog_pid);
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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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return tvb_captured_length(tvb);
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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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/*
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* Editor modelines - https://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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