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
|
/*
* Copyright (c) 2013 Balabit
* Copyright (c) 2013 Balazs Scheidler <bazsi@balabit.hu>
* Copyright (c) 2022 Balazs Scheidler <bazsi77@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*/
#include "multi-line/multi-line-pattern.h"
#include "messages.h"
MultiLinePattern *
multi_line_pattern_compile(const gchar *regexp, GError **error)
{
MultiLinePattern *self = g_new0(MultiLinePattern, 1);
gint rc;
PCRE2_SIZE erroffset;
g_return_val_if_fail(error == NULL || *error == NULL, FALSE);
self->ref_cnt = 1;
/* compile the regexp */
self->pattern = pcre2_compile((PCRE2_SPTR) regexp, PCRE2_ZERO_TERMINATED, 0, &rc, &erroffset, NULL);
if (!self->pattern)
{
PCRE2_UCHAR error_message[128];
pcre2_get_error_message(rc, error_message, sizeof(error_message));
g_set_error(error, 0, 0,
"Error while compiling multi-line regexp as a PCRE expression, error=%s, error_at=%" G_GSIZE_FORMAT,
(gchar *) error_message, erroffset);
goto error;
}
/* optimize regexp */
rc = pcre2_jit_compile(self->pattern, PCRE2_JIT_COMPLETE);
if (rc < 0)
{
PCRE2_UCHAR error_message[128];
pcre2_get_error_message(rc, error_message, sizeof(error_message));
msg_debug("multi-line-pattern: Error while JIT compiling regular expression, continuing without JIT",
evt_tag_str("regexp", regexp),
evt_tag_str("error", (gchar *) error_message));
}
return self;
error:
if (self->pattern)
pcre2_code_free(self->pattern);
g_free(self);
return NULL;
}
gint
multi_line_pattern_eval(MultiLinePattern *re, const guchar *str, gsize len, pcre2_match_data *match_data)
{
return pcre2_match(re->pattern, (PCRE2_SPTR) str, (PCRE2_SIZE) len, 0, 0, match_data, NULL);
}
gboolean
multi_line_pattern_find(MultiLinePattern *re, const guchar *str, gsize len, gint *start, gint *end)
{
if (!re)
return FALSE;
gboolean result = FALSE;
pcre2_match_data *match_data = pcre2_match_data_create_from_pattern(re->pattern, NULL);
if (multi_line_pattern_eval(re, str, len, match_data) < 0)
goto exit;
guint32 num_matches = pcre2_get_ovector_count(match_data);
PCRE2_SIZE *matches = pcre2_get_ovector_pointer(match_data);
if (num_matches == 0)
goto exit;
*start = matches[0];
*end = matches[1];
result = TRUE;
exit:
pcre2_match_data_free(match_data);
return result;
}
gboolean
multi_line_pattern_match(MultiLinePattern *re, const guchar *str, gsize len)
{
if (!re)
return FALSE;
gboolean result = FALSE;
pcre2_match_data *match_data = pcre2_match_data_create_from_pattern(re->pattern, NULL);
if (multi_line_pattern_eval(re, str, len, match_data) < 0)
goto exit;
guint32 num_matches = pcre2_get_ovector_count(match_data);
PCRE2_SIZE *matches = pcre2_get_ovector_pointer(match_data);
result = num_matches > 0 && matches[0] >= 0;
exit:
pcre2_match_data_free(match_data);
return result;
}
MultiLinePattern *
multi_line_pattern_ref(MultiLinePattern *self)
{
if (self)
self->ref_cnt++;
return self;
}
void
multi_line_pattern_unref(MultiLinePattern *self)
{
if (self && (--self->ref_cnt == 0))
{
if (self->pattern)
pcre2_code_free(self->pattern);
g_free(self);
}
}
|
