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
|
/*
* $Id$
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 2001 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <ftypes-int.h>
#include <string.h>
#include <epan/gdebug.h>
#ifdef HAVE_LIBPCRE
#include <pcre.h>
#define CMP_MATCHES cmp_matches
#else
#define CMP_MATCHES NULL
#endif
#define tvb_is_private fvalue_gboolean1
static void
value_new(fvalue_t *fv)
{
fv->value.tvb = NULL;
fv->tvb_is_private = FALSE;
}
static void
value_free(fvalue_t *fv)
{
if (fv->value.tvb && fv->tvb_is_private) {
tvb_free_chain(fv->value.tvb);
}
}
static void
value_set(fvalue_t *fv, gpointer value, gboolean already_copied)
{
g_assert(already_copied);
/* Free up the old value, if we have one */
value_free(fv);
fv->value.tvb = value;
}
static void
free_tvb_data(void *data)
{
g_free(data);
}
static gboolean
val_from_string(fvalue_t *fv, char *s, LogFunc logfunc _U_)
{
tvbuff_t *new_tvb;
guint8 *private_data;
/* Free up the old value, if we have one */
value_free(fv);
/* Make a tvbuff from the string. We can drop the
* terminating NUL. */
private_data = g_memdup(s, strlen(s));
new_tvb = tvb_new_real_data(private_data,
strlen(s), strlen(s));
/* Let the tvbuff know how to delete the data. */
tvb_set_free_cb(new_tvb, free_tvb_data);
/* And let us know that we need to free the tvbuff */
fv->tvb_is_private = TRUE;
fv->value.tvb = new_tvb;
return TRUE;
}
static gboolean
val_from_unparsed(fvalue_t *fv, char *s, gboolean allow_partial_value _U_, LogFunc logfunc)
{
fvalue_t *fv_bytes;
tvbuff_t *new_tvb;
guint8 *private_data;
/* Free up the old value, if we have one */
value_free(fv);
/* Does this look like a byte string? */
fv_bytes = fvalue_from_unparsed(FT_BYTES, s, TRUE, NULL);
if (fv_bytes) {
/* Make a tvbuff from the bytes */
private_data = g_memdup(fv_bytes->value.bytes->data,
fv_bytes->value.bytes->len);
new_tvb = tvb_new_real_data(private_data,
fv_bytes->value.bytes->len,
fv_bytes->value.bytes->len);
/* Let the tvbuff know how to delete the data. */
tvb_set_free_cb(new_tvb, free_tvb_data);
/* And let us know that we need to free the tvbuff */
fv->tvb_is_private = TRUE;
fv->value.tvb = new_tvb;
return TRUE;
}
else {
/* Treat it as a string. */
return val_from_string(fv, s, logfunc);
}
g_assert_not_reached();
}
static gpointer
value_get(fvalue_t *fv)
{
return fv->value.tvb;
}
static guint
len(fvalue_t *fv)
{
if (fv->value.tvb)
return tvb_length(fv->value.tvb);
else
return 0;
}
static void
slice(fvalue_t *fv, GByteArray *bytes, guint offset, guint length)
{
const guint8* data;
if (fv->value.tvb) {
TRY {
data = tvb_get_ptr(fv->value.tvb, offset, length);
g_byte_array_append(bytes, data, length);
}
CATCH_ALL {
/* nothing */
}
ENDTRY;
}
}
static gboolean
cmp_contains(fvalue_t *fv_a, fvalue_t *fv_b)
{
if (tvb_find_tvb(fv_a->value.tvb, fv_b->value.tvb, 0) > -1) {
return TRUE;
}
else {
return FALSE;
}
}
#ifdef HAVE_LIBPCRE
static gboolean
cmp_matches(fvalue_t *fv_a, fvalue_t *fv_b)
{
tvbuff_t *tvb = fv_a->value.tvb;
pcre_tuple_t *pcre = fv_b->value.re;
int options = 0;
int rc;
const char *data = NULL; /* tvb data */
guint32 tvb_len; /* tvb length */
/* fv_b is always a FT_PCRE, otherwise the dfilter semcheck() would have
* warned us. For the same reason (and because we're using g_malloc()),
* fv_b->value.re is not NULL.
*/
if (strcmp(fv_b->ftype->name, "FT_PCRE") != 0) {
return FALSE;
}
if (! pcre) {
return FALSE;
}
TRY {
tvb_len = tvb_length(tvb);
data = (const char *)tvb_get_ptr(tvb, 0, tvb_len);
rc = pcre_exec(
pcre->re, /* Compiled PCRE */
pcre->ex, /* PCRE extra from pcre_study() */
data, /* The data to check for the pattern... */
tvb_len, /* ... and its length */
0, /* Start offset within data */
options, /* PCRE options */
NULL, /* We are not interested in the matched string */
0 /* of the pattern; only in success or failure. */
);
/* NOTE - DO NOT g_free(data) */
}
CATCH_ALL {
return FALSE;
}
ENDTRY;
if (rc == 0) {
return TRUE;
}
return FALSE;
}
#endif
void
ftype_register_tvbuff(void)
{
static ftype_t protocol_type = {
"FT_PROTOCOL", /* name */
"protocol", /* pretty_name */
0, /* wire_size */
value_new, /* new_value */
value_free, /* free_value */
val_from_unparsed, /* val_from_unparsed */
val_from_string, /* val_from_string */
NULL, /* val_to_string_repr */
NULL, /* len_string_repr */
value_set, /* set_value */
NULL, /* set_value_integer */
NULL, /* set_value_integer64 */
NULL, /* set_value_floating */
value_get, /* get_value */
NULL, /* get_value_integer */
NULL, /* get_value_integer64 */
NULL, /* get_value_floating */
/* TODO - tvb's *can* do 'eq', etc. */
NULL, /* cmp_eq */
NULL, /* cmp_ne */
NULL, /* cmp_gt */
NULL, /* cmp_ge */
NULL, /* cmp_lt */
NULL, /* cmp_le */
NULL, /* cmp_bitwise_and */
cmp_contains,
CMP_MATCHES,
len,
slice,
};
ftype_register(FT_PROTOCOL, &protocol_type);
}
|