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
|
/* packet-etv.c
*
* Routines for ETV-AM from OC-SP-ETV-AM1.0-IO5
* Copyright 2012, Weston Schmidt <weston_schmidt@alumni.purdue.edu>
*
* 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/expert.h>
#include "packet-mpeg-sect.h"
void proto_register_etv(void);
void proto_reg_handoff_etv(void);
static dissector_handle_t etv_dii_handle;
static dissector_handle_t etv_ddb_handle;
static int proto_etv_dii;
static int proto_etv_ddb;
static dissector_handle_t dsmcc_handle;
static int hf_etv_dii_filter_info;
static int hf_etv_dii_reserved;
static expert_field ei_etv_dii_invalid_section_syntax_indicator;
static expert_field ei_etv_dii_invalid_section_length;
static expert_field ei_etv_dii_invalid_reserved_bits;
static expert_field ei_etv_dii_filter_info;
static int hf_etv_ddb_filter_info;
static int hf_etv_ddb_reserved;
static expert_field ei_etv_ddb_invalid_section_syntax_indicator;
static expert_field ei_etv_ddb_invalid_section_length;
static expert_field ei_etv_ddb_invalid_reserved_bits;
static expert_field ei_etv_ddb_filter_info;
static int ett_etv;
static int ett_etv_payload;
static void
dissect_etv_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int proto,
int hf_filter_info, int hf_reserved,
expert_field* ei_section_syntax_indicator, expert_field* ei_reserved,
expert_field* ei_section_length, expert_field* ei_filter_info)
{
tvbuff_t *sub_tvb;
unsigned offset = 0;
proto_item *ti;
proto_item *pi;
proto_tree *etv_tree;
proto_item *items[PACKET_MPEG_SECT_PI__SIZE];
bool ssi;
unsigned reserved;
uint8_t reserved2;
uint16_t filter_info;
unsigned sect_len;
ti = proto_tree_add_item(tree, proto, tvb, offset, -1, ENC_NA);
etv_tree = proto_item_add_subtree(ti, ett_etv);
offset += packet_mpeg_sect_header_extra(tvb, offset, etv_tree, §_len,
&reserved, &ssi, items);
if (false != ssi) {
proto_item *msg_error;
msg_error = items[PACKET_MPEG_SECT_PI__SSI];
proto_item_set_generated(msg_error);
expert_add_info(pinfo, msg_error, ei_section_syntax_indicator);
}
if (4 != reserved) {
proto_item *msg_error;
msg_error = items[PACKET_MPEG_SECT_PI__RESERVED];
proto_item_set_generated(msg_error);
expert_add_info(pinfo, msg_error, ei_reserved);
}
col_append_fstr(pinfo->cinfo, COL_INFO, ", Length: %u", sect_len);
proto_item_append_text(ti, " Length=%u", sect_len);
if (1021 < sect_len) {
proto_item *msg_error;
msg_error = items[PACKET_MPEG_SECT_PI__LENGTH];
proto_item_set_generated(msg_error);
expert_add_info(pinfo, msg_error, ei_section_length);
}
filter_info = tvb_get_ntohs(tvb, offset);
col_append_fstr(pinfo->cinfo, COL_INFO, ", Filter: 0x%x", filter_info);
proto_item_append_text(ti, " Filter=0x%x", filter_info);
pi = proto_tree_add_item(etv_tree, hf_filter_info, tvb, offset, 2, ENC_BIG_ENDIAN);
if ((proto_etv_dii == proto) && (0xFBFB != filter_info)) {
expert_add_info_format(pinfo, pi, ei_filter_info,
"Invalid filter_info value (must be 0xFBFB)");
} else if ((proto_etv_ddb == proto) &&
((filter_info < 1) || (0xfbef < filter_info)))
{
expert_add_info_format(pinfo, pi, ei_filter_info,
"Invalid filter_info value (must be [0x0001-0xFBEF] inclusive)");
}
offset += 2;
reserved2 = tvb_get_uint8(tvb, offset);
pi = proto_tree_add_item(etv_tree, hf_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
if (0 != reserved2) {
expert_add_info_format(pinfo, pi, ei_reserved,
"Invalid reserved2 bits (should all be 0)");
}
offset += 1;
sub_tvb = tvb_new_subset_length(tvb, offset, sect_len-7);
call_dissector(dsmcc_handle, sub_tvb, pinfo, tree);
sect_len += 3 - 4; /* add header, remove crc */
packet_mpeg_sect_crc(tvb, pinfo, etv_tree, 0, sect_len);
}
static int
dissect_etv_ddb(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETV-DDB");
col_set_str(pinfo->cinfo, COL_INFO, "ETV DDB");
dissect_etv_common(tvb, pinfo, tree, proto_etv_ddb, hf_etv_ddb_filter_info,
hf_etv_ddb_reserved, &ei_etv_ddb_invalid_section_syntax_indicator,
&ei_etv_ddb_invalid_reserved_bits, &ei_etv_ddb_invalid_section_length,
&ei_etv_ddb_filter_info);
return tvb_captured_length(tvb);
}
static int
dissect_etv_dii(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETV-DII");
col_set_str(pinfo->cinfo, COL_INFO, "ETV DII");
dissect_etv_common(tvb, pinfo, tree, proto_etv_dii, hf_etv_dii_filter_info,
hf_etv_dii_reserved, &ei_etv_dii_invalid_section_syntax_indicator,
&ei_etv_dii_invalid_reserved_bits, &ei_etv_dii_invalid_section_length,
&ei_etv_dii_filter_info);
return tvb_captured_length(tvb);
}
void
proto_register_etv(void)
{
static hf_register_info hf_ddb[] = {
{ &hf_etv_ddb_filter_info, {
"Filter Info", "etv-ddb.filter_info",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_etv_ddb_reserved, {
"Reserved", "etv-ddb.reserved",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} }
};
static hf_register_info hf_dii[] = {
{ &hf_etv_dii_filter_info, {
"Filter Info", "etv-dii.filter_info",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_etv_dii_reserved, {
"Reserved", "etv-dii.reserved",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} }
};
static int *ett[] = {
&ett_etv,
&ett_etv_payload
};
static ei_register_info ei_ddb[] = {
{ &ei_etv_ddb_invalid_section_syntax_indicator, { "etv-ddb.invalid_section_syntax_indicator", PI_MALFORMED, PI_ERROR, "Invalid section_syntax_indicator (should be 0)", EXPFILL }},
{ &ei_etv_ddb_invalid_reserved_bits, { "etv-ddb.invalid_reserved_bits", PI_MALFORMED, PI_ERROR, "Invalid reserved bits", EXPFILL }},
{ &ei_etv_ddb_invalid_section_length, { "etv-ddb.invalid_section_length", PI_MALFORMED, PI_ERROR, "Invalid section_length (must not exceed 1021)", EXPFILL }},
{ &ei_etv_ddb_filter_info, { "etv-ddb.filter_info.invalid", PI_MALFORMED, PI_ERROR, "Invalid filter info", EXPFILL }},
};
static ei_register_info ei_dii[] = {
{ &ei_etv_dii_invalid_section_syntax_indicator, { "etv-dii.invalid_section_syntax_indicator", PI_MALFORMED, PI_ERROR, "Invalid section_syntax_indicator (should be 0)", EXPFILL }},
{ &ei_etv_dii_invalid_reserved_bits, { "etv-dii.invalid_reserved_bits", PI_MALFORMED, PI_ERROR, "Invalid reserved bits", EXPFILL }},
{ &ei_etv_dii_invalid_section_length, { "etv-dii.invalid_section_length", PI_MALFORMED, PI_ERROR, "Invalid section_length (must not exceed 1021)", EXPFILL }},
{ &ei_etv_dii_filter_info, { "etv-dii.filter_info.invalid", PI_MALFORMED, PI_ERROR, "Invalid filter info", EXPFILL }},
};
expert_module_t* expert_etv_dii;
expert_module_t* expert_etv_ddb;
proto_etv_dii = proto_register_protocol("ETV-AM DII Section", "ETV-AM DII", "etv-dii");
proto_etv_ddb = proto_register_protocol("ETV-AM DDB Section", "ETV-AM DDB", "etv-ddb");
proto_register_field_array(proto_etv_dii, hf_dii, array_length(hf_dii));
proto_register_field_array(proto_etv_ddb, hf_ddb, array_length(hf_ddb));
proto_register_subtree_array(ett, array_length(ett));
expert_etv_dii = expert_register_protocol(proto_etv_dii);
expert_register_field_array(expert_etv_dii, ei_dii, array_length(ei_dii));
expert_etv_ddb = expert_register_protocol(proto_etv_ddb);
expert_register_field_array(expert_etv_ddb, ei_ddb, array_length(ei_ddb));
etv_dii_handle = register_dissector("etv-dii", dissect_etv_dii, proto_etv_dii);
etv_ddb_handle = register_dissector("etv-ddb", dissect_etv_ddb, proto_etv_ddb);
}
void
proto_reg_handoff_etv(void)
{
dissector_add_uint("mpeg_sect.tid", ETV_TID_DII_SECTION, etv_dii_handle);
dissector_add_uint("mpeg_sect.tid", ETV_TID_DDB_SECTION, etv_ddb_handle);
dsmcc_handle = find_dissector_add_dependency("mp2t-dsmcc", proto_etv_dii);
find_dissector_add_dependency("mp2t-dsmcc", proto_etv_ddb);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
|
