forked from collectd/collectd
-
Notifications
You must be signed in to change notification settings - Fork 8
/
utils_ignorelist.c
345 lines (294 loc) · 8.21 KB
/
utils_ignorelist.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
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/**
* collectd - src/utils_ignorelist.c
* Copyright (C) 2006 Lubos Stanek <lubek at users.sourceforge.net>
* Copyright (C) 2008 Florian Forster <octo at verplant.org>
*
* This program is free software; you can redistribute it and/
* or modify it under the terms of the GNU General Public Li-
* cence as published by the Free Software Foundation; either
* version 2 of the Licence, or any later version.
*
* This program is distributed in the hope that it will be use-
* ful, but WITHOUT ANY WARRANTY; without even the implied war-
* ranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public Licence 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:
* Lubos Stanek <lubek at users.sourceforge.net>
* Florian Forster <octo at verplant.org>
**/
/**
* ignorelist handles plugin's list of configured collectable
* entries with global ignore action
**/
/**
* Usage:
*
* Define plugin's global pointer variable of type ignorelist_t:
* ignorelist_t *myconfig_ignore;
* If you know the state of the global ignore (IgnoreSelected),
* allocate the variable with:
* myconfig_ignore = ignorelist_create (YourKnownIgnore);
* If you do not know the state of the global ignore,
* initialize the global variable and set the ignore flag later:
* myconfig_ignore = ignorelist_init ();
* Append single entries in your cf_register'ed callback function:
* ignorelist_add (myconfig_ignore, newentry);
* When you hit the IgnoreSelected config option,
* offer it to the list:
* ignorelist_ignore (myconfig_ignore, instantly_got_value_of_ignore);
* That is all for the ignorelist initialization.
* Later during read and write (plugin's registered functions) get
* the information whether this entry would be collected or not:
* if (ignorelist_match (myconfig_ignore, thisentry))
* return;
**/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include "common.h"
#include "plugin.h"
#include "utils_ignorelist.h"
/*
* private prototypes
*/
struct ignorelist_item_s
{
#if HAVE_REGEX_H
regex_t *rmatch; /* regular expression entry identification */
#endif
char *smatch; /* string entry identification */
struct ignorelist_item_s *next;
};
typedef struct ignorelist_item_s ignorelist_item_t;
struct ignorelist_s
{
int ignore; /* ignore entries */
ignorelist_item_t *head; /* pointer to the first entry */
};
/* *** *** *** ********************************************* *** *** *** */
/* *** *** *** *** *** *** private functions *** *** *** *** *** *** */
/* *** *** *** ********************************************* *** *** *** */
static inline void ignorelist_append (ignorelist_t *il, ignorelist_item_t *item)
{
assert ((il != NULL) && (item != NULL));
item->next = il->head;
il->head = item;
}
#if HAVE_REGEX_H
static int ignorelist_append_regex(ignorelist_t *il, const char *entry)
{
regex_t *re;
ignorelist_item_t *item;
int status;
/* create buffer */
re = malloc (sizeof (*re));
if (re == NULL)
{
ERROR ("ignorelist_append_regex: malloc failed.");
return ENOMEM;
}
memset (re, 0, sizeof (*re));
/* compile regex */
status = regcomp (re, entry, REG_EXTENDED);
if (status != 0)
{
char errbuf[1024];
(void) regerror (status, re, errbuf, sizeof (errbuf));
ERROR ("ignorelist_append_regex: Compiling regular expression \"%s\" failed: %s", entry, errbuf);
sfree (re);
return status;
}
/* create new entry */
item = malloc (sizeof (*item));
if (item == NULL)
{
ERROR ("ignorelist_append_regex: malloc failed.");
regfree (re);
sfree (re);
return ENOMEM;
}
memset (item, 0, sizeof (*item));
item->rmatch = re;
/* append new entry */
ignorelist_append (il, item);
return (0);
} /* int ignorelist_append_regex(ignorelist_t *il, const char *entry) */
#endif
static int ignorelist_append_string(ignorelist_t *il, const char *entry)
{
ignorelist_item_t *new;
/* create new entry */
if ((new = malloc(sizeof(ignorelist_item_t))) == NULL )
{
ERROR ("cannot allocate new entry");
return (1);
}
memset (new, '\0', sizeof(ignorelist_item_t));
new->smatch = sstrdup(entry);
/* append new entry */
ignorelist_append (il, new);
return (0);
} /* int ignorelist_append_string(ignorelist_t *il, const char *entry) */
#if HAVE_REGEX_H
/*
* check list for entry regex match
* return 1 if found
*/
static int ignorelist_match_regex (ignorelist_item_t *item, const char *entry)
{
assert ((item != NULL) && (item->rmatch != NULL)
&& (entry != NULL) && (strlen (entry) > 0));
/* match regex */
if (regexec (item->rmatch, entry, 0, NULL, 0) == 0)
return (1);
return (0);
} /* int ignorelist_match_regex (ignorelist_item_t *item, const char *entry) */
#endif
/*
* check list for entry string match
* return 1 if found
*/
static int ignorelist_match_string (ignorelist_item_t *item, const char *entry)
{
assert ((item != NULL) && (item->smatch != NULL)
&& (entry != NULL) && (strlen (entry) > 0));
if (strcmp (entry, item->smatch) == 0)
return (1);
return (0);
} /* int ignorelist_match_string (ignorelist_item_t *item, const char *entry) */
/* *** *** *** ******************************************** *** *** *** */
/* *** *** *** *** *** *** public functions *** *** *** *** *** *** */
/* *** *** *** ******************************************** *** *** *** */
/*
* create the ignorelist_t with known ignore state
* return pointer to ignorelist_t
*/
ignorelist_t *ignorelist_create (int invert)
{
ignorelist_t *il;
il = malloc (sizeof (*il));
if (il == NULL)
return NULL;
memset (il, 0, sizeof (*il));
/*
* ->ignore == 0 => collect
* ->ignore == 1 => ignore
*/
il->ignore = invert ? 0 : 1;
return (il);
} /* ignorelist_t *ignorelist_create (int ignore) */
/*
* free memory used by ignorelist_t
*/
void ignorelist_free (ignorelist_t *il)
{
ignorelist_item_t *this;
ignorelist_item_t *next;
if (il == NULL)
return;
for (this = il->head; this != NULL; this = next)
{
next = this->next;
#if HAVE_REGEX_H
if (this->rmatch != NULL)
{
regfree (this->rmatch);
sfree (this->rmatch);
this->rmatch = NULL;
}
#endif
if (this->smatch != NULL)
{
sfree (this->smatch);
this->smatch = NULL;
}
sfree (this);
}
sfree (il);
il = NULL;
} /* void ignorelist_destroy (ignorelist_t *il) */
/*
* set ignore state of the ignorelist_t
*/
void ignorelist_set_invert (ignorelist_t *il, int invert)
{
if (il == NULL)
{
DEBUG("ignore call with ignorelist_t == NULL");
return;
}
il->ignore = invert ? 0 : 1;
} /* void ignorelist_set_invert (ignorelist_t *il, int ignore) */
/*
* append entry into ignorelist_t
* return 1 for success
*/
int ignorelist_add (ignorelist_t *il, const char *entry)
{
size_t len;
if (il == NULL)
{
DEBUG ("add called with ignorelist_t == NULL");
return (1);
}
len = strlen (entry);
/* append nothing */
if (len == 0)
{
DEBUG("not appending: empty entry");
return (1);
}
#if HAVE_REGEX_H
/* regex string is enclosed in "/.../" */
if ((len > 2) && (entry[0] == '/') && entry[len - 1] == '/')
{
char *copy;
int status;
/* skip leading slash */
copy = strdup (entry + 1);
if (copy == NULL)
return ENOMEM;
/* trim trailing slash */
copy[strlen (copy) - 1] = 0;
status = ignorelist_append_regex (il, copy);
sfree (copy);
return status;
}
#endif
return ignorelist_append_string(il, entry);
} /* int ignorelist_add (ignorelist_t *il, const char *entry) */
/*
* check list for entry
* return 1 for ignored entry
*/
int ignorelist_match (ignorelist_t *il, const char *entry)
{
ignorelist_item_t *traverse;
/* if no entries, collect all */
if ((il == NULL) || (il->head == NULL))
return (0);
if ((entry == NULL) || (strlen (entry) == 0))
return (0);
/* traverse list and check entries */
for (traverse = il->head; traverse != NULL; traverse = traverse->next)
{
#if HAVE_REGEX_H
if (traverse->rmatch != NULL)
{
if (ignorelist_match_regex (traverse, entry))
return (il->ignore);
}
else
#endif
{
if (ignorelist_match_string (traverse, entry))
return (il->ignore);
}
} /* for traverse */
return (1 - il->ignore);
} /* int ignorelist_match (ignorelist_t *il, const char *entry) */