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-data.c
* Routines for raw data (default case)
* Gilbert Ramirez <gram@alumni.rice.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/prefs.h>
#include <epan/to_str.h>
#include <wsutil/wsgcrypt.h>
#include <wsutil/str_util.h>
#include "packet-tls.h"
#include "packet-dtls.h"
void proto_register_data(void);
void proto_reg_handoff_data(void);
static int proto_data = -1;
static int hf_data_data = -1;
static int hf_data_len = -1;
static int hf_data_md5_hash = -1;
static int hf_data_text = -1;
static int hf_data_uncompressed_data = -1;
static int hf_data_uncompressed_len = -1;
static gboolean new_pane = FALSE;
static gboolean uncompress_data = FALSE;
static gboolean show_as_text = FALSE;
static gboolean generate_md5_hash = FALSE;
static gint ett_data = -1;
static dissector_handle_t data_handle;
static int
dissect_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
gint bytes;
char *display_str;
if (tree) {
bytes = tvb_captured_length(tvb);
if (bytes > 0) {
tvbuff_t *data_tvb;
tvbuff_t *uncompr_tvb = NULL;
gint uncompr_len = 0;
proto_item *ti;
proto_tree *data_tree;
if (new_pane) {
guint8 *real_data = (guint8 *)tvb_memdup(pinfo->pool, tvb, 0, bytes);
data_tvb = tvb_new_child_real_data(tvb,real_data,bytes,bytes);
add_new_data_source(pinfo, data_tvb, "Not dissected data bytes");
} else {
data_tvb = tvb;
}
ti = proto_tree_add_protocol_format(tree, proto_data, tvb,
0,
bytes, "Data (%d byte%s)", bytes,
plurality(bytes, "", "s"));
data_tree = proto_item_add_subtree(ti, ett_data);
proto_tree_add_item(data_tree, hf_data_data, data_tvb, 0, bytes, ENC_NA);
if (uncompress_data) {
uncompr_tvb = tvb_child_uncompress(data_tvb, data_tvb, 0, tvb_reported_length(data_tvb));
if (uncompr_tvb) {
uncompr_len = tvb_reported_length(uncompr_tvb);
add_new_data_source(pinfo, uncompr_tvb, "Uncompressed Data");
proto_tree_add_item(data_tree, hf_data_uncompressed_data, uncompr_tvb, 0, uncompr_len, ENC_NA);
ti = proto_tree_add_int(data_tree, hf_data_uncompressed_len, uncompr_tvb, 0, 0, uncompr_len);
proto_item_set_generated (ti);
}
}
if (show_as_text) {
tvbuff_t *text_tvb;
int text_length;
if (uncompr_tvb && uncompr_len > 0) {
text_tvb = uncompr_tvb;
text_length = uncompr_len;
} else {
text_tvb = data_tvb;
text_length = bytes;
}
proto_tree_add_item_ret_display_string(data_tree, hf_data_text, text_tvb, 0, text_length, ENC_UTF_8, pinfo->pool, &display_str);
col_add_str(pinfo->cinfo, COL_INFO, display_str);
}
if(generate_md5_hash) {
const guint8 *cp;
guint8 digest[HASH_MD5_LENGTH];
const gchar *digest_string;
cp = tvb_get_ptr(tvb, 0, bytes);
gcry_md_hash_buffer(GCRY_MD_MD5, digest, cp, bytes);
digest_string = bytes_to_str_punct(pinfo->pool, digest, HASH_MD5_LENGTH, '\0');
ti = proto_tree_add_string(data_tree, hf_data_md5_hash, tvb, 0, 0, digest_string);
proto_item_set_generated(ti);
}
ti = proto_tree_add_int(data_tree, hf_data_len, data_tvb, 0, 0, bytes);
proto_item_set_generated (ti);
}
}
return tvb_captured_length(tvb);
}
void
proto_register_data(void)
{
static hf_register_info hf[] = {
{ &hf_data_data,
{ "Data", "data.data",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_data_text,
{ "Text", "data.text",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_data_uncompressed_data,
{ "Uncompressed Data", "data.uncompressed.data",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_data_uncompressed_len,
{ "Uncompressed Length", "data.uncompressed.len",
FT_INT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_data_len,
{ "Length", "data.len",
FT_INT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_data_md5_hash,
{ "Payload MD5 hash", "data.md5_hash",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
};
static gint *ett[] = {
&ett_data
};
module_t *module_data;
proto_data = proto_register_protocol (
"Data", /* name */
"Data", /* short name */
"data" /* abbrev */
);
data_handle = register_dissector("data", dissect_data, proto_data);
proto_register_field_array(proto_data, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
module_data = prefs_register_protocol( proto_data, NULL);
prefs_register_bool_preference(module_data,
"datapref.newpane",
"Show not dissected data on new Packet Bytes pane",
"Show not dissected data on new Packet Bytes pane",
&new_pane);
#ifdef HAVE_ZLIB
prefs_register_bool_preference(module_data,
"uncompress_data",
"Try to uncompress zlib compressed data",
"Try to uncompress zlib compressed data and show as uncompressed if successful",
&uncompress_data);
#endif
prefs_register_bool_preference(module_data,
"show_as_text",
"Show data as text",
"Show data as text in the Packet Details pane",
&show_as_text);
prefs_register_bool_preference(module_data,
"md5_hash",
"Generate MD5 hash",
"Whether or not MD5 hashes should be generated and shown for each payload.",
&generate_md5_hash);
/*
* "Data" is used to dissect something whose normal dissector
* is disabled, so it cannot itself be disabled.
*/
proto_set_cant_toggle(proto_data);
}
static void
add_foreach_decode_as(const gchar *table_name, const gchar *ui_name _U_, gpointer user_data)
{
dissector_handle_t handle = (dissector_handle_t) user_data;
dissector_table_t dissector_table = find_dissector_table(table_name);
if (dissector_table_supports_decode_as(dissector_table))
dissector_add_for_decode_as(table_name, handle);
}
void
proto_reg_handoff_data(void)
{
dissector_add_string("media_type", "application/octet-stream", data_handle);
ssl_dissector_add(0, data_handle);
dtls_dissector_add(0, data_handle);
dissector_all_tables_foreach_table(add_foreach_decode_as, (gpointer)data_handle, NULL);
}
/*
* 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:
*/
|
