forked from collectd/collectd
/
match_regex.c
300 lines (252 loc) · 6.73 KB
/
match_regex.c
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
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
/**
* collectd - src/match_regex.c
* Copyright (C) 2008 Sebastian Harl
* Copyright (C) 2008 Florian Forster
*
* 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; only version 2 of the License is applicable.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors:
* Sebastian Harl <sh at tokkee.org>
* Florian Forster <octo at verplant.org>
**/
/*
* This module allows to filter and rewrite value lists based on
* Perl-compatible regular expressions.
*/
#include "collectd.h"
#include "filter_chain.h"
#include <sys/types.h>
#include <regex.h>
#define log_err(...) ERROR ("`regex' match: " __VA_ARGS__)
#define log_warn(...) WARNING ("`regex' match: " __VA_ARGS__)
/*
* private data types
*/
struct mr_regex_s;
typedef struct mr_regex_s mr_regex_t;
struct mr_regex_s
{
regex_t re;
char *re_str;
mr_regex_t *next;
};
struct mr_match_s;
typedef struct mr_match_s mr_match_t;
struct mr_match_s
{
mr_regex_t *host;
mr_regex_t *plugin;
mr_regex_t *plugin_instance;
mr_regex_t *type;
mr_regex_t *type_instance;
};
/*
* internal helper functions
*/
static void mr_free_regex (mr_regex_t *r) /* {{{ */
{
if (r == NULL)
return;
regfree (&r->re);
memset (&r->re, 0, sizeof (r->re));
free (r->re_str);
if (r->next != NULL)
mr_free_regex (r->next);
} /* }}} void mr_free_regex */
static void mr_free_match (mr_match_t *m) /* {{{ */
{
if (m == NULL)
return;
mr_free_regex (m->host);
mr_free_regex (m->plugin);
mr_free_regex (m->plugin_instance);
mr_free_regex (m->type);
mr_free_regex (m->type_instance);
free (m);
} /* }}} void mr_free_match */
static int mr_match_regexen (mr_regex_t *re_head, /* {{{ */
const char *string)
{
mr_regex_t *re;
if (re_head == NULL)
return (FC_MATCH_MATCHES);
for (re = re_head; re != NULL; re = re->next)
{
int status;
status = regexec (&re->re, string,
/* nmatch = */ 0, /* pmatch = */ NULL,
/* eflags = */ 0);
if (status == 0)
{
DEBUG ("regex match: Regular expression `%s' matches `%s'.",
re->re_str, string);
}
else
{
DEBUG ("regex match: Regular expression `%s' does not match `%s'.",
re->re_str, string);
return (FC_MATCH_NO_MATCH);
}
}
return (FC_MATCH_MATCHES);
} /* }}} int mr_match_regexen */
static int mr_config_add_regex (mr_regex_t **re_head, /* {{{ */
oconfig_item_t *ci)
{
mr_regex_t *re;
int status;
if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
{
log_warn ("`%s' needs exactly one string argument.", ci->key);
return (-1);
}
re = (mr_regex_t *) malloc (sizeof (*re));
if (re == NULL)
{
log_err ("mr_config_add_regex: malloc failed.");
return (-1);
}
memset (re, 0, sizeof (*re));
re->next = NULL;
re->re_str = strdup (ci->values[0].value.string);
if (re->re_str == NULL)
{
free (re);
log_err ("mr_config_add_regex: strdup failed.");
return (-1);
}
status = regcomp (&re->re, re->re_str, REG_EXTENDED | REG_NOSUB);
if (status != 0)
{
char errmsg[1024];
regerror (status, &re->re, errmsg, sizeof (errmsg));
errmsg[sizeof (errmsg) - 1] = 0;
log_err ("Compiling regex `%s' for `%s' failed: %s.",
re->re_str, ci->key, errmsg);
free (re->re_str);
free (re);
return (-1);
}
if (*re_head == NULL)
{
*re_head = re;
}
else
{
mr_regex_t *ptr;
ptr = *re_head;
while (ptr->next != NULL)
ptr = ptr->next;
ptr->next = re;
}
return (0);
} /* }}} int mr_config_add_regex */
static int mr_create (const oconfig_item_t *ci, void **user_data) /* {{{ */
{
mr_match_t *m;
int status;
int i;
m = (mr_match_t *) malloc (sizeof (*m));
if (m == NULL)
{
log_err ("mr_create: malloc failed.");
return (-ENOMEM);
}
memset (m, 0, sizeof (*m));
status = 0;
for (i = 0; i < ci->children_num; i++)
{
oconfig_item_t *child = ci->children + i;
if ((strcasecmp ("Host", child->key) == 0)
|| (strcasecmp ("Hostname", child->key) == 0))
status = mr_config_add_regex (&m->host, child);
else if (strcasecmp ("Plugin", child->key) == 0)
status = mr_config_add_regex (&m->plugin, child);
else if (strcasecmp ("PluginInstance", child->key) == 0)
status = mr_config_add_regex (&m->plugin_instance, child);
else if (strcasecmp ("Type", child->key) == 0)
status = mr_config_add_regex (&m->type, child);
else if (strcasecmp ("TypeInstance", child->key) == 0)
status = mr_config_add_regex (&m->type_instance, child);
else
{
log_err ("The `%s' configuration option is not understood and "
"will be ignored.", child->key);
status = 0;
}
if (status != 0)
break;
}
/* Additional sanity-checking */
while (status == 0)
{
if ((m->host == NULL)
&& (m->plugin == NULL)
&& (m->plugin_instance == NULL)
&& (m->type == NULL)
&& (m->type_instance == NULL))
{
log_err ("No (valid) regular expressions have been configured. "
"This match will be ignored.");
status = -1;
}
break;
}
if (status != 0)
{
mr_free_match (m);
return (status);
}
*user_data = m;
return (0);
} /* }}} int mr_create */
static int mr_destroy (void **user_data) /* {{{ */
{
if ((user_data != NULL) && (*user_data != NULL))
mr_free_match (*user_data);
return (0);
} /* }}} int mr_destroy */
static int mr_match (const data_set_t __attribute__((unused)) *ds, /* {{{ */
const value_list_t *vl,
notification_meta_t __attribute__((unused)) **meta,
void **user_data)
{
mr_match_t *m;
if ((user_data == NULL) || (*user_data == NULL))
return (-1);
m = *user_data;
if (mr_match_regexen (m->host, vl->host) == FC_MATCH_NO_MATCH)
return (FC_MATCH_NO_MATCH);
if (mr_match_regexen (m->plugin, vl->plugin) == FC_MATCH_NO_MATCH)
return (FC_MATCH_NO_MATCH);
if (mr_match_regexen (m->plugin_instance,
vl->plugin_instance) == FC_MATCH_NO_MATCH)
return (FC_MATCH_NO_MATCH);
if (mr_match_regexen (m->type, vl->type) == FC_MATCH_NO_MATCH)
return (FC_MATCH_NO_MATCH);
if (mr_match_regexen (m->type_instance,
vl->type_instance) == FC_MATCH_NO_MATCH)
return (FC_MATCH_NO_MATCH);
return (FC_MATCH_MATCHES);
} /* }}} int mr_match */
void module_register (void)
{
match_proc_t mproc;
memset (&mproc, 0, sizeof (mproc));
mproc.create = mr_create;
mproc.destroy = mr_destroy;
mproc.match = mr_match;
fc_register_match ("regex", mproc);
} /* module_register */
/* vim: set sw=4 ts=4 tw=78 noexpandtab fdm=marker : */