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
|
/* packet-interlink.c
* Routines for Interlink protocol packet disassembly
* By Uwe Girlich <uwe.girlich@philosys.de>
* Copyright 2010 Uwe Girlich
*
* 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>
void proto_register_interlink(void);
void proto_reg_handoff_interlink(void);
/*
* No public information available.
*/
static int proto_interlink = -1;
static int hf_interlink_id = -1;
static int hf_interlink_version = -1;
static int hf_interlink_cmd = -1;
static int hf_interlink_seq = -1;
static int hf_interlink_flags = -1;
static int hf_interlink_flags_req_ack = -1;
static int hf_interlink_flags_inc_ack_port = -1;
static int hf_interlink_block_type = -1;
static int hf_interlink_block_version = -1;
static int hf_interlink_block_length = -1;
static gint ett_interlink = -1;
static gint ett_interlink_header = -1;
static gint ett_interlink_flags = -1;
static gint ett_interlink_block = -1;
static dissector_handle_t data_handle;
static dissector_table_t subdissector_table;
static dissector_handle_t interlink_handle;
static const value_string names_cmd[] = {
{ 1, "Data" },
{ 2, "Ack" },
{ 0, NULL }
};
static int
dissect_interlink(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int offset = 0;
proto_tree *il_tree;
proto_item *il_item;
proto_tree *ilh_tree = NULL;
proto_tree *ilb_tree = NULL;
guint8 ilb_type;
guint8 ilb_version;
guint16 type_version = 0;
dissector_handle_t handle;
tvbuff_t *next_tvb;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "INTERLINK");
col_clear(pinfo->cinfo, COL_INFO);
il_item = proto_tree_add_item(tree, proto_interlink,
tvb, 0, 16, ENC_NA);
il_tree = proto_item_add_subtree(il_item, ett_interlink);
ilh_tree = proto_tree_add_subtree(il_tree, tvb, 0, 12, ett_interlink_header, NULL, "Interlink Header");
if (ilh_tree) {
proto_tree_add_item(ilh_tree, hf_interlink_id, tvb, offset, 4, ENC_ASCII);
offset += 4;
proto_tree_add_item(ilh_tree, hf_interlink_version, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(ilh_tree, hf_interlink_cmd, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(ilh_tree, hf_interlink_seq, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
} else {
offset += 10;
}
if (ilh_tree) {
static int * const flags[] = {
&hf_interlink_flags_req_ack,
&hf_interlink_flags_inc_ack_port,
NULL
};
proto_tree_add_bitmask(ilh_tree, tvb, offset, hf_interlink_flags, ett_interlink_flags, flags, ENC_LITTLE_ENDIAN);
}
offset += 2;
ilb_tree = proto_tree_add_subtree(il_tree, tvb, offset, 4, ett_interlink_block, NULL, "Block Header");
ilb_type = tvb_get_guint8(tvb, offset);
ilb_version = tvb_get_guint8(tvb, offset + 1);
type_version = ilb_type << 8 | ilb_version;
col_append_fstr(pinfo->cinfo, COL_INFO, "Type: %d, Version: %d",
ilb_type, ilb_version);
if (ilb_tree) {
proto_tree_add_item(ilb_tree, hf_interlink_block_type, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(ilb_tree, hf_interlink_block_version, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(ilb_tree, hf_interlink_block_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
offset += 2;
} else {
offset += 4;
}
/* Generate a new tvb for the rest. */
next_tvb = tvb_new_subset_remaining(tvb, offset);
/* Probably a sub-dissector exists for this type/version combination. */
handle = dissector_get_uint_handle(subdissector_table, type_version);
/* Without a proper sub-dissector, we use "data". */
if (handle == NULL) handle = data_handle;
/* Call the sub-dissector. */
call_dissector(handle, next_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
static gboolean
dissect_interlink_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
if (!tvb_bytes_exist(tvb, 0, 4)) {
return FALSE;
}
if (
tvb_get_guint8(tvb,0) != 'I' ||
tvb_get_guint8(tvb,1) != 'L' ||
tvb_get_guint8(tvb,2) != 'N' ||
tvb_get_guint8(tvb,3) != 'K'
)
return FALSE;
dissect_interlink(tvb, pinfo, tree, data);
return TRUE;
}
void
proto_register_interlink(void)
{
static hf_register_info hf[] = {
{ &hf_interlink_id, {
"Magic ID", "interlink.id", FT_STRING,
BASE_NONE, NULL, 0, NULL, HFILL }},
{ &hf_interlink_version, {
"Version", "interlink.version", FT_UINT16,
BASE_DEC, NULL, 0, NULL, HFILL }},
{ &hf_interlink_cmd, {
"Command", "interlink.cmd", FT_UINT16,
BASE_DEC, VALS(names_cmd), 0, NULL, HFILL }},
{ &hf_interlink_seq, {
"Sequence", "interlink.seq", FT_UINT16,
BASE_DEC, NULL, 0, NULL, HFILL }},
{ &hf_interlink_flags, {
"Flags", "interlink.flags", FT_UINT16,
BASE_HEX, NULL, 0, NULL, HFILL }},
{ &hf_interlink_flags_req_ack, {
"REQ_ACK", "interlink.flags.req_ack", FT_BOOLEAN,
16, TFS(&tfs_set_notset), 0x01, NULL, HFILL }},
{ &hf_interlink_flags_inc_ack_port, {
"INC_ACK_PORT", "interlink.flags.inc_ack_port", FT_BOOLEAN,
16, TFS(&tfs_set_notset), 0x02, NULL, HFILL }},
{ &hf_interlink_block_type, {
"Type", "interlink.type", FT_UINT8,
BASE_DEC, NULL, 0, NULL, HFILL }},
{ &hf_interlink_block_version, {
"Version", "interlink.block_version", FT_UINT8,
BASE_DEC, NULL, 0, NULL, HFILL }},
{ &hf_interlink_block_length, {
"Length", "interlink.length", FT_UINT16,
BASE_DEC, NULL, 0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_interlink,
&ett_interlink_header,
&ett_interlink_flags,
&ett_interlink_block,
};
proto_interlink = proto_register_protocol("Interlink Protocol",
"Interlink",
"interlink");
proto_register_field_array(proto_interlink, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
interlink_handle = register_dissector("interlink", dissect_interlink, proto_interlink);
/* Probably someone will write sub-dissectors. You can never know. */
subdissector_table = register_dissector_table("interlink.type_version",
"Interlink type_version", proto_interlink, FT_UINT16, BASE_HEX);
}
void
proto_reg_handoff_interlink(void)
{
/* Allow "Decode As" with any UDP packet. */
dissector_add_for_decode_as_with_preference("udp.port", interlink_handle);
/* Add our heuristic packet finder. */
heur_dissector_add("udp", dissect_interlink_heur, "Interlink over UDP", "interlink_udp", proto_interlink, HEURISTIC_ENABLE);
data_handle = find_dissector("data");
}
/*
* 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:
*/
|
