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
|
/*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* Perl-Compatible Regular Expression (PCRE) internal field type.
* Used with the "matches" dfilter operator, allowing efficient
* compilation and studying of a PCRE pattern in dfilters.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <ftypes-int.h>
#include <glib.h>
#include <string.h>
static void
gregex_fvalue_new(fvalue_t *fv)
{
fv->value.re = NULL;
}
static void
gregex_fvalue_free(fvalue_t *fv)
{
if (fv->value.re) {
g_regex_unref(fv->value.re);
fv->value.re = NULL;
}
}
/* Determines whether pattern needs to match raw byte sequences */
static gboolean
raw_flag_needed(const gchar *pattern)
{
gboolean found = FALSE;
const gchar *s = pattern;
size_t i, len;
/* find any character whose hex value is two letters */
len = strlen(s);
for (i = 0; i < len; i++) {
if ((s[i] >= '\xAA' && s[i] <= '\xAF') ||
(s[i] >= '\xBA' && s[i] <= '\xBF') ||
(s[i] >= '\xCA' && s[i] <= '\xCF') ||
(s[i] >= '\xDA' && s[i] <= '\xDF') ||
(s[i] >= '\xEA' && s[i] <= '\xEF') ||
(s[i] >= '\xFA' && s[i] <= '\xFF'))
{
found = TRUE;
break;
}
}
return found;
}
/* Generate a FT_PCRE from a parsed string pattern.
* Uses the specified logfunc() to report errors. */
static gboolean
val_from_string(fvalue_t *fv, char *pattern, LogFunc logfunc)
{
GError *regex_error = NULL;
GRegexCompileFlags cflags = G_REGEX_OPTIMIZE;
/* Set RAW flag only if pattern requires matching raw byte
sequences. Otherwise, omit it so that GRegex treats its
input as UTF8-encoded string. */
if (raw_flag_needed(pattern)) {
cflags |= G_REGEX_RAW;
}
/* Free up the old value, if we have one */
gregex_fvalue_free(fv);
fv->value.re = g_regex_new(
pattern, /* pattern */
cflags, /* Compile options */
0, /* Match options */
®ex_error /* Compile / study errors */
);
if (regex_error) {
if (logfunc) {
logfunc(regex_error->message);
}
g_error_free(regex_error);
if (fv->value.re) {
g_regex_unref(fv->value.re);
}
return FALSE;
}
return TRUE;
}
/* Generate a FT_PCRE from an unparsed string pattern.
* Uses the specified logfunc() to report errors. */
static gboolean
val_from_unparsed(fvalue_t *fv, char *pattern, gboolean allow_partial_value _U_, LogFunc logfunc)
{
g_assert(! allow_partial_value);
return val_from_string(fv, pattern, logfunc);
}
static int
gregex_repr_len(fvalue_t *fv, ftrepr_t rtype)
{
g_assert(rtype == FTREPR_DFILTER);
return (int)strlen(g_regex_get_pattern(fv->value.re));
}
static void
gregex_to_repr(fvalue_t *fv, ftrepr_t rtype, char *buf)
{
g_assert(rtype == FTREPR_DFILTER);
strcpy(buf, g_regex_get_pattern(fv->value.re));
}
/* BEHOLD - value contains the string representation of the regular expression,
* and we want to store the compiled PCRE RE object into the value. */
static void
gregex_fvalue_set(fvalue_t *fv, gpointer value, gboolean already_copied)
{
g_assert(value != NULL);
/* Free up the old value, if we have one */
gregex_fvalue_free(fv);
g_assert(! already_copied);
val_from_unparsed(fv, (char *)value, FALSE, NULL);
}
static gpointer
gregex_fvalue_get(fvalue_t *fv)
{
return fv->value.re;
}
void
ftype_register_pcre(void)
{
static ftype_t pcre_type = {
FT_PCRE, /* ftype */
"FT_PCRE", /* name */
"Compiled Perl-Compatible Regular Expression (GRegex) object", /* pretty_name */
0, /* wire_size */
gregex_fvalue_new, /* new_value */
gregex_fvalue_free, /* free_value */
val_from_unparsed, /* val_from_unparsed */
val_from_string, /* val_from_string */
gregex_to_repr, /* val_to_string_repr */
gregex_repr_len, /* len_string_repr */
gregex_fvalue_set, /* set_value */
NULL, /* set_value_uinteger */
NULL, /* set_value_sinteger */
NULL, /* set_value_integer64 */
NULL, /* set_value_floating */
gregex_fvalue_get, /* get_value */
NULL, /* get_value_uinteger */
NULL, /* get_value_sinteger */
NULL, /* get_value_integer64 */
NULL, /* get_value_floating */
NULL, /* cmp_eq */
NULL, /* cmp_ne */
NULL, /* cmp_gt */
NULL, /* cmp_ge */
NULL, /* cmp_lt */
NULL, /* cmp_le */
NULL, /* cmp_bitwise_and */
NULL, /* cmp_contains */
NULL, /* cmp_matches */
NULL, /* len */
NULL, /* slice */
};
ftype_register(FT_PCRE, &pcre_type);
}
/*
* Editor modelines - http://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:
*/
|
