/src/wireshark/epan/dissectors/packet-mpeg-pat.c

Source
/* packet-mpeg-pat.c
 * Routines for MPEG2 (ISO/ISO 13818-1) Program Associate Table (PAT) dissection
 * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/tfs.h>
#include <wsutil/array.h>
#include "packet-mpeg-sect.h"

void proto_register_mpeg_pat(void);
void proto_reg_handoff_mpeg_pat(void);

static dissector_handle_t mpeg_pat_handle;

static int proto_mpeg_pat;
static int hf_mpeg_pat_transport_stream_id;
static int hf_mpeg_pat_reserved;
static int hf_mpeg_pat_version_number;
static int hf_mpeg_pat_current_next_indicator;
static int hf_mpeg_pat_section_number;
static int hf_mpeg_pat_last_section_number;

static int hf_mpeg_pat_program_number;
static int hf_mpeg_pat_program_reserved;
static int hf_mpeg_pat_program_map_pid;


static int ett_mpeg_pat;
static int ett_mpeg_pat_prog;

#define MPEG_PAT_RESERVED_MASK                    0xC0
#define MPEG_PAT_VERSION_NUMBER_MASK              0x3E
#define MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK      0x01

#define MPEG_PAT_PROGRAM_RESERVED_MASK          0xE000
#define MPEG_PAT_PROGRAM_MAP_PID_MASK           0x1FFF

static int
dissect_mpeg_pat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
    unsigned offset = 0, length = 0;
    uint16_t prog_num, prog_pid;

    proto_item *ti;
    proto_tree *mpeg_pat_tree;
    proto_tree *mpeg_pat_prog_tree;

    /* The TVB should start right after the section_length in the Section packet */

    col_set_str(pinfo->cinfo, COL_INFO, "Program Association Table (PAT)");

    ti = proto_tree_add_item(tree, proto_mpeg_pat, tvb, offset, -1, ENC_NA);
    mpeg_pat_tree = proto_item_add_subtree(ti, ett_mpeg_pat);

    offset += packet_mpeg_sect_header(tvb, offset, mpeg_pat_tree, &length, NULL);
    length -= 4;

    proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    /* Parse all the programs */
    while (offset < length) {

        prog_num = tvb_get_ntohs(tvb, offset);
        prog_pid = tvb_get_ntohs(tvb, offset + 2) & MPEG_PAT_PROGRAM_MAP_PID_MASK;

        mpeg_pat_prog_tree = proto_tree_add_subtree_format(mpeg_pat_tree, tvb, offset, 4,
                        ett_mpeg_pat_prog, NULL, "Program 0x%04hx -> PID 0x%04hx", prog_num, prog_pid);

        proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_number, tvb, offset, 2, ENC_BIG_ENDIAN);
        offset += 2;

        proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
        proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_map_pid, tvb, offset, 2, ENC_BIG_ENDIAN);
        offset += 2;

    }

    offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_pat_tree, 0, offset);
    proto_item_set_len(ti, offset);
    return tvb_captured_length(tvb);
}


void
proto_register_mpeg_pat(void)
{

    static hf_register_info hf[] = {

        { &hf_mpeg_pat_transport_stream_id, {
            "Transport Stream ID", "mpeg_pat.tsid",
            FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
        } },

        { &hf_mpeg_pat_reserved, {
            "Reserved", "mpeg_pat.reserved",
            FT_UINT8, BASE_HEX, NULL, MPEG_PAT_RESERVED_MASK, NULL, HFILL
        } },

        { &hf_mpeg_pat_version_number, {
            "Version Number", "mpeg_pat.version",
            FT_UINT8, BASE_HEX, NULL, MPEG_PAT_VERSION_NUMBER_MASK, NULL, HFILL
        } },

        { &hf_mpeg_pat_current_next_indicator, {
            "Current/Next Indicator", "mpeg_pat.cur_next_ind",
            FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
        } },

        { &hf_mpeg_pat_section_number, {
            "Section Number", "mpeg_pat.sect_num",
            FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
        } },

        { &hf_mpeg_pat_last_section_number, {
            "Last Section Number", "mpeg_pat.last_sect_num",
            FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
        } },

        { &hf_mpeg_pat_program_number, {
            "Program Number", "mpeg_pat.prog_num",
            FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
        } },

        { &hf_mpeg_pat_program_reserved, {
            "Reserved", "mpeg_pat.prog_reserved",
            FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_RESERVED_MASK, NULL, HFILL
        } },

        { &hf_mpeg_pat_program_map_pid, {
            "Program Map PID", "mpeg_pat.prog_map_pid",
            FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_MAP_PID_MASK, NULL, HFILL
        } },

    };

    static int *ett[] = {
        &ett_mpeg_pat,
        &ett_mpeg_pat_prog
    };

    proto_mpeg_pat = proto_register_protocol("MPEG2 Program Association Table", "MPEG PAT", "mpeg_pat");

    proto_register_field_array(proto_mpeg_pat, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));

    mpeg_pat_handle = register_dissector("mpeg_pat", dissect_mpeg_pat, proto_mpeg_pat);
}


void proto_reg_handoff_mpeg_pat(void)
{
    dissector_add_uint("mpeg_sect.tid", MPEG_PAT_TID, mpeg_pat_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:
 */

Line	Count	Source
1		/* packet-mpeg-pat.c
2		* Routines for MPEG2 (ISO/ISO 13818-1) Program Associate Table (PAT) dissection
3		* Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
4		*
5		* Wireshark - Network traffic analyzer
6		* By Gerald Combs <gerald@wireshark.org>
7		* Copyright 1998 Gerald Combs
8		*
9		* SPDX-License-Identifier: GPL-2.0-or-later
10		*/
11
12		#include "config.h"
13
14		#include <epan/packet.h>
15		#include <epan/tfs.h>
16		#include <wsutil/array.h>
17		#include "packet-mpeg-sect.h"
18
19		void proto_register_mpeg_pat(void);
20		void proto_reg_handoff_mpeg_pat(void);
21
22		static dissector_handle_t mpeg_pat_handle;
23
24		static int proto_mpeg_pat;
25		static int hf_mpeg_pat_transport_stream_id;
26		static int hf_mpeg_pat_reserved;
27		static int hf_mpeg_pat_version_number;
28		static int hf_mpeg_pat_current_next_indicator;
29		static int hf_mpeg_pat_section_number;
30		static int hf_mpeg_pat_last_section_number;
31
32		static int hf_mpeg_pat_program_number;
33		static int hf_mpeg_pat_program_reserved;
34		static int hf_mpeg_pat_program_map_pid;
35
36
37		static int ett_mpeg_pat;
38		static int ett_mpeg_pat_prog;
39
40	16	#define MPEG_PAT_RESERVED_MASK 0xC0
41	16	#define MPEG_PAT_VERSION_NUMBER_MASK 0x3E
42	16	#define MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK 0x01
43
44	16	#define MPEG_PAT_PROGRAM_RESERVED_MASK 0xE000
45	998	#define MPEG_PAT_PROGRAM_MAP_PID_MASK 0x1FFF
46
47		static int
48		dissect_mpeg_pat(tvbuff_t tvb, packet_info pinfo, proto_tree tree, void data _U_)
49	80	{
50	80	unsigned offset = 0, length = 0;
51	80	uint16_t prog_num, prog_pid;
52
53	80	proto_item *ti;
54	80	proto_tree *mpeg_pat_tree;
55	80	proto_tree *mpeg_pat_prog_tree;
56
57		/* The TVB should start right after the section_length in the Section packet */
58
59	80	col_set_str(pinfo->cinfo, COL_INFO, "Program Association Table (PAT)");
60
61	80	ti = proto_tree_add_item(tree, proto_mpeg_pat, tvb, offset, -1, ENC_NA);
62	80	mpeg_pat_tree = proto_item_add_subtree(ti, ett_mpeg_pat);
63
64	80	offset += packet_mpeg_sect_header(tvb, offset, mpeg_pat_tree, &length, NULL);
65	80	length -= 4;
66
67	80	proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
68	80	offset += 2;
69
70	80	proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
71	80	proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
72	80	proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
73	80	offset += 1;
74
75	80	proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
76	80	offset += 1;
77
78	80	proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
79	80	offset += 1;
80
81		/* Parse all the programs */
82	1.06k	while (offset < length) {
83
84	982	prog_num = tvb_get_ntohs(tvb, offset);
85	982	prog_pid = tvb_get_ntohs(tvb, offset + 2) & MPEG_PAT_PROGRAM_MAP_PID_MASK;
86
87	982	mpeg_pat_prog_tree = proto_tree_add_subtree_format(mpeg_pat_tree, tvb, offset, 4,
88	982	ett_mpeg_pat_prog, NULL, "Program 0x%04hx -> PID 0x%04hx", prog_num, prog_pid);
89
90	982	proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_number, tvb, offset, 2, ENC_BIG_ENDIAN);
91	982	offset += 2;
92
93	982	proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
94	982	proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_map_pid, tvb, offset, 2, ENC_BIG_ENDIAN);
95	982	offset += 2;
96
97	982	}
98
99	80	offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_pat_tree, 0, offset);
100	80	proto_item_set_len(ti, offset);
101	80	return tvb_captured_length(tvb);
102	80	}
103
104
105		void
106		proto_register_mpeg_pat(void)
107	16	{
108
109	16	static hf_register_info hf[] = {
110
111	16	{ &hf_mpeg_pat_transport_stream_id, {
112	16	"Transport Stream ID", "mpeg_pat.tsid",
113	16	FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
114	16	} },
115
116	16	{ &hf_mpeg_pat_reserved, {
117	16	"Reserved", "mpeg_pat.reserved",
118	16	FT_UINT8, BASE_HEX, NULL, MPEG_PAT_RESERVED_MASK, NULL, HFILL
119	16	} },
120
121	16	{ &hf_mpeg_pat_version_number, {
122	16	"Version Number", "mpeg_pat.version",
123	16	FT_UINT8, BASE_HEX, NULL, MPEG_PAT_VERSION_NUMBER_MASK, NULL, HFILL
124	16	} },
125
126	16	{ &hf_mpeg_pat_current_next_indicator, {
127	16	"Current/Next Indicator", "mpeg_pat.cur_next_ind",
128	16	FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
129	16	} },
130
131	16	{ &hf_mpeg_pat_section_number, {
132	16	"Section Number", "mpeg_pat.sect_num",
133	16	FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
134	16	} },
135
136	16	{ &hf_mpeg_pat_last_section_number, {
137	16	"Last Section Number", "mpeg_pat.last_sect_num",
138	16	FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
139	16	} },
140
141	16	{ &hf_mpeg_pat_program_number, {
142	16	"Program Number", "mpeg_pat.prog_num",
143	16	FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
144	16	} },
145
146	16	{ &hf_mpeg_pat_program_reserved, {
147	16	"Reserved", "mpeg_pat.prog_reserved",
148	16	FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_RESERVED_MASK, NULL, HFILL
149	16	} },
150
151	16	{ &hf_mpeg_pat_program_map_pid, {
152	16	"Program Map PID", "mpeg_pat.prog_map_pid",
153	16	FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_MAP_PID_MASK, NULL, HFILL
154	16	} },
155
156	16	};
157
158	16	static int *ett[] = {
159	16	&ett_mpeg_pat,
160	16	&ett_mpeg_pat_prog
161	16	};
162
163	16	proto_mpeg_pat = proto_register_protocol("MPEG2 Program Association Table", "MPEG PAT", "mpeg_pat");
164
165	16	proto_register_field_array(proto_mpeg_pat, hf, array_length(hf));
166	16	proto_register_subtree_array(ett, array_length(ett));
167
168	16	mpeg_pat_handle = register_dissector("mpeg_pat", dissect_mpeg_pat, proto_mpeg_pat);
169	16	}
170
171
172		void proto_reg_handoff_mpeg_pat(void)
173	16	{
174	16	dissector_add_uint("mpeg_sect.tid", MPEG_PAT_TID, mpeg_pat_handle);
175	16	}
176
177		/*
178		* Editor modelines - https://www.wireshark.org/tools/modelines.html
179		*
180		* Local variables:
181		* c-basic-offset: 4
182		* tab-width: 8
183		* indent-tabs-mode: nil
184		* End:
185		*
186		* vi: set shiftwidth=4 tabstop=8 expandtab:
187		* :indentSize=4:tabSize=8:noTabs=true:
188		*/

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Created: 2026-11-12 07:01