summaryrefslogtreecommitdiffstats
path: root/epan/dissectors/packet-dvb-sdt.c
blob: 586a5eab86f22614b854503b4820f9835b4023b6 (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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
/* packet-mpeg-sdt.c
 * Routines for DVB (ETSI EN 300 468) Servide Description Table (SDT) 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"
#include "packet-mpeg-descriptor.h"

void proto_register_dvb_sdt(void);
void proto_reg_handoff_dvb_sdt(void);

static dissector_handle_t dvb_sdt_handle;

static int proto_dvb_sdt = -1;
static int hf_dvb_sdt_transport_stream_id = -1;
static int hf_dvb_sdt_reserved1 = -1;
static int hf_dvb_sdt_version_number = -1;
static int hf_dvb_sdt_current_next_indicator = -1;
static int hf_dvb_sdt_section_number = -1;
static int hf_dvb_sdt_last_section_number = -1;

static int hf_dvb_sdt_original_network_id = -1;
static int hf_dvb_sdt_reserved2 = -1;

static int hf_dvb_sdt_service_id = -1;
static int hf_dvb_sdt_reserved3 = -1;
static int hf_dvb_sdt_eit_schedule_flag = -1;
static int hf_dvb_sdt_eit_present_following_flag = -1;
static int hf_dvb_sdt_running_status = -1;
static int hf_dvb_sdt_free_ca_mode = -1;
static int hf_dvb_sdt_descriptors_loop_length = -1;

static gint ett_dvb_sdt = -1;
static gint ett_dvb_sdt_service = -1;

#define DVB_SDT_RESERVED1_MASK                  0xC0
#define DVB_SDT_VERSION_NUMBER_MASK             0x3E
#define DVB_SDT_CURRENT_NEXT_INDICATOR_MASK     0x01

#define DVB_SDT_RESERVED3_MASK                  0xFC
#define DVB_SDT_EIT_SCHEDULE_FLAG_MASK          0x02
#define DVB_SDT_EIT_PRESENT_FOLLOWING_FLAG_MASK 0x01

#define DVB_SDT_RUNNING_STATUS_MASK             0xE000
#define DVB_SDT_FREE_CA_MODE_MASK               0x1000
#define DVB_SDT_DESCRIPTORS_LOOP_LENGTH_MASK    0x0FFF

static const value_string dvb_sdt_running_status_vals[] = {
    { 0, "Undefined" },
    { 1, "Not Running" },
    { 2, "Starts in a few seconds" },
    { 3, "Pausing" },
    { 4, "Running" },
    { 5, "Service off-air" },

    { 0, NULL }
};

static const value_string dvb_sdt_free_ca_mode_vals[] = {
    { 0, "Not Scrambled" },
    { 1, "One or more component scrambled" },

    { 0, NULL }
};

static int
dissect_dvb_sdt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{

    guint       offset = 0, length = 0;
    guint       descriptor_len;
    guint16     svc_id;

    proto_item *ti;
    proto_tree *dvb_sdt_tree;
    proto_tree *dvb_sdt_service_tree;

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

    col_set_str(pinfo->cinfo, COL_INFO, "Service Description Table (SDT)");

    ti = proto_tree_add_item(tree, proto_dvb_sdt, tvb, offset, -1, ENC_NA);
    dvb_sdt_tree = proto_item_add_subtree(ti, ett_dvb_sdt);

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

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_transport_stream_id,    tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_reserved1,              tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_version_number,         tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_section_number,         tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_last_section_number,    tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_original_network_id,    tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_reserved2,              tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;


    if (offset >= length)
        return offset;

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

        svc_id = tvb_get_ntohs(tvb, offset);
        dvb_sdt_service_tree = proto_tree_add_subtree_format(dvb_sdt_tree, tvb, offset, 5,
                    ett_dvb_sdt_service, NULL, "Service 0x%04hx", svc_id);

        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_service_id,                 tvb, offset, 2, ENC_BIG_ENDIAN);
        offset += 2;

        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_reserved3,                  tvb, offset, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_eit_schedule_flag,          tvb, offset, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_eit_present_following_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
        offset += 1;

        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_running_status,             tvb, offset, 2, ENC_BIG_ENDIAN);
        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_free_ca_mode,               tvb, offset, 2, ENC_BIG_ENDIAN);
        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_descriptors_loop_length,    tvb, offset, 2, ENC_BIG_ENDIAN);
        descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_SDT_DESCRIPTORS_LOOP_LENGTH_MASK;
        offset += 2;

        offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_sdt_service_tree);
    }

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


void
proto_register_dvb_sdt(void)
{

    static hf_register_info hf[] = {

        { &hf_dvb_sdt_transport_stream_id, {
            "Transport Stream ID", "dvb_sdt.tsid",
            FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
        } },

        { &hf_dvb_sdt_reserved1, {
            "Reserved", "dvb_sdt.reserved1",
            FT_UINT8, BASE_HEX, NULL, DVB_SDT_RESERVED1_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_version_number, {
            "Version Number", "dvb_sdt.version",
            FT_UINT8, BASE_HEX, NULL, DVB_SDT_VERSION_NUMBER_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_current_next_indicator, {
            "Current/Next Indicator", "dvb_sdt.cur_next_ind",
            FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), DVB_SDT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_section_number, {
            "Section Number", "dvb_sdt.sect_num",
            FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
        } },

        { &hf_dvb_sdt_last_section_number, {
            "Last Section Number", "dvb_sdt.last_sect_num",
            FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
        } },

        { &hf_dvb_sdt_original_network_id, {
            "Original Network ID", "dvb_sdt.original_nid",
            FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
        } },

        { &hf_dvb_sdt_reserved2, {
            "Reserved", "dvb_sdt.reserved2",
            FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL
        } },


        { &hf_dvb_sdt_service_id, {
            "Service ID", "dvb_sdt.svc.id",
            FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
        } },

        { &hf_dvb_sdt_reserved3, {
            "Reserved", "dvb_sdt.svc.reserved",
            FT_UINT8, BASE_HEX, NULL, DVB_SDT_RESERVED3_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_eit_schedule_flag, {
            "EIT Schedule Flag", "dvb_sdt.svc.eit_schedule_flag",
            FT_UINT8, BASE_DEC, NULL, DVB_SDT_EIT_SCHEDULE_FLAG_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_eit_present_following_flag, {
            "EIT Present Following Flag", "dvb_sdt.svc.eit_present_following_flag",
            FT_UINT8, BASE_DEC, NULL, DVB_SDT_EIT_PRESENT_FOLLOWING_FLAG_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_running_status, {
            "Running Status", "dvb_sdt.svc.running_status",
            FT_UINT16, BASE_HEX, VALS(dvb_sdt_running_status_vals), DVB_SDT_RUNNING_STATUS_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_free_ca_mode, {
            "Free CA Mode", "dvb_sdt.svc.free_ca_mode",
            FT_UINT16, BASE_HEX, VALS(dvb_sdt_free_ca_mode_vals), DVB_SDT_FREE_CA_MODE_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_descriptors_loop_length, {
            "Descriptors Loop Length", "dvb_sdt.svc.descr_loop_len",
            FT_UINT16, BASE_DEC, NULL, DVB_SDT_DESCRIPTORS_LOOP_LENGTH_MASK, NULL, HFILL
        } }

    };

    static gint *ett[] = {
        &ett_dvb_sdt,
        &ett_dvb_sdt_service
    };

    proto_dvb_sdt = proto_register_protocol("DVB Service Description Table", "DVB SDT", "dvb_sdt");

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

    dvb_sdt_handle = register_dissector("dvb_sdt", dissect_dvb_sdt, proto_dvb_sdt);
}


void proto_reg_handoff_dvb_sdt(void)
{
    dissector_add_uint("mpeg_sect.tid", DVB_SDT_TID_ACTUAL, dvb_sdt_handle);
    dissector_add_uint("mpeg_sect.tid", DVB_SDT_TID_OTHER, dvb_sdt_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:
 */