summaryrefslogtreecommitdiffstats
path: root/epan/dissectors/packet-mpeg-pat.c
blob: 8f5ae08e3bb44e93c237aa9439f4c335ee03193b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
/* 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 "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 = -1;
static int hf_mpeg_pat_transport_stream_id = -1;
static int hf_mpeg_pat_reserved = -1;
static int hf_mpeg_pat_version_number = -1;
static int hf_mpeg_pat_current_next_indicator = -1;
static int hf_mpeg_pat_section_number = -1;
static int hf_mpeg_pat_last_section_number = -1;

static int hf_mpeg_pat_program_number = -1;
static int hf_mpeg_pat_program_reserved = -1;
static int hf_mpeg_pat_program_map_pid = -1;


static gint ett_mpeg_pat = -1;
static gint ett_mpeg_pat_prog = -1;

#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_)
{
    guint offset = 0, length = 0;
    guint16 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 gint *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:
 */