1 /**
2 * collectd - src/tail.c
3 * Copyright (C) 2008 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "common.h"
24 #include "plugin.h"
25 #include "utils_tail_match.h"
27 /*
28 * <Plugin tail>
29 * <File "/var/log/exim4/mainlog">
30 * Instance "exim"
31 * Interval 60
32 * <Match>
33 * Regex "S=([1-9][0-9]*)"
34 * ExcludeRegex "U=root.*S="
35 * DSType "CounterAdd"
36 * Type "ipt_bytes"
37 * Instance "total"
38 * </Match>
39 * </File>
40 * </Plugin>
41 */
43 struct ctail_config_match_s
44 {
45 char *regex;
46 char *excluderegex;
47 int flags;
48 char *type;
49 char *type_instance;
50 cdtime_t interval;
51 };
52 typedef struct ctail_config_match_s ctail_config_match_t;
54 cu_tail_match_t **tail_match_list = NULL;
55 size_t tail_match_list_num = 0;
56 cdtime_t tail_match_list_intervals[255];
58 static int ctail_config_add_match_dstype (ctail_config_match_t *cm,
59 oconfig_item_t *ci)
60 {
61 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
62 {
63 WARNING ("tail plugin: `DSType' needs exactly one string argument.");
64 return (-1);
65 }
67 if (strncasecmp ("Gauge", ci->values[0].value.string, strlen ("Gauge")) == 0)
68 {
69 cm->flags = UTILS_MATCH_DS_TYPE_GAUGE;
70 if (strcasecmp ("GaugeAverage", ci->values[0].value.string) == 0)
71 cm->flags |= UTILS_MATCH_CF_GAUGE_AVERAGE;
72 else if (strcasecmp ("GaugeMin", ci->values[0].value.string) == 0)
73 cm->flags |= UTILS_MATCH_CF_GAUGE_MIN;
74 else if (strcasecmp ("GaugeMax", ci->values[0].value.string) == 0)
75 cm->flags |= UTILS_MATCH_CF_GAUGE_MAX;
76 else if (strcasecmp ("GaugeLast", ci->values[0].value.string) == 0)
77 cm->flags |= UTILS_MATCH_CF_GAUGE_LAST;
78 else
79 cm->flags = 0;
80 }
81 else if (strncasecmp ("Counter", ci->values[0].value.string, strlen ("Counter")) == 0)
82 {
83 cm->flags = UTILS_MATCH_DS_TYPE_COUNTER;
84 if (strcasecmp ("CounterSet", ci->values[0].value.string) == 0)
85 cm->flags |= UTILS_MATCH_CF_COUNTER_SET;
86 else if (strcasecmp ("CounterAdd", ci->values[0].value.string) == 0)
87 cm->flags |= UTILS_MATCH_CF_COUNTER_ADD;
88 else if (strcasecmp ("CounterInc", ci->values[0].value.string) == 0)
89 cm->flags |= UTILS_MATCH_CF_COUNTER_INC;
90 else
91 cm->flags = 0;
92 }
93 else if (strncasecmp ("Derive", ci->values[0].value.string, strlen ("Derive")) == 0)
94 {
95 cm->flags = UTILS_MATCH_DS_TYPE_DERIVE;
96 if (strcasecmp ("DeriveSet", ci->values[0].value.string) == 0)
97 cm->flags |= UTILS_MATCH_CF_DERIVE_SET;
98 else if (strcasecmp ("DeriveAdd", ci->values[0].value.string) == 0)
99 cm->flags |= UTILS_MATCH_CF_DERIVE_ADD;
100 else if (strcasecmp ("DeriveInc", ci->values[0].value.string) == 0)
101 cm->flags |= UTILS_MATCH_CF_DERIVE_INC;
102 else
103 cm->flags = 0;
104 }
105 else if (strncasecmp ("Absolute", ci->values[0].value.string, strlen ("Absolute")) == 0)
106 {
107 cm->flags = UTILS_MATCH_DS_TYPE_ABSOLUTE;
108 if (strcasecmp ("AbsoluteSet", ci->values[0].value.string) == 0)
109 cm->flags |= UTILS_MATCH_CF_ABSOLUTE_SET;
110 else
111 cm->flags = 0;
112 }
113 else
114 {
115 cm->flags = 0;
116 }
118 if (cm->flags == 0)
119 {
120 WARNING ("tail plugin: `%s' is not a valid argument to `DSType'.",
121 ci->values[0].value.string);
122 return (-1);
123 }
125 return (0);
126 } /* int ctail_config_add_match_dstype */
128 static int ctail_config_add_match (cu_tail_match_t *tm,
129 const char *plugin_instance, oconfig_item_t *ci, cdtime_t interval)
130 {
131 ctail_config_match_t cm;
132 int status;
133 int i;
135 memset (&cm, '\0', sizeof (cm));
137 if (ci->values_num != 0)
138 {
139 WARNING ("tail plugin: Ignoring arguments for the `Match' block.");
140 }
142 status = 0;
143 for (i = 0; i < ci->children_num; i++)
144 {
145 oconfig_item_t *option = ci->children + i;
147 if (strcasecmp ("Regex", option->key) == 0)
148 status = cf_util_get_string (option, &cm.regex);
149 else if (strcasecmp ("ExcludeRegex", option->key) == 0)
150 status = cf_util_get_string (option, &cm.excluderegex);
151 else if (strcasecmp ("DSType", option->key) == 0)
152 status = ctail_config_add_match_dstype (&cm, option);
153 else if (strcasecmp ("Type", option->key) == 0)
154 status = cf_util_get_string (option, &cm.type);
155 else if (strcasecmp ("Instance", option->key) == 0)
156 status = cf_util_get_string (option, &cm.type_instance);
157 else
158 {
159 WARNING ("tail plugin: Option `%s' not allowed here.", option->key);
160 status = -1;
161 }
163 if (status != 0)
164 break;
165 } /* for (i = 0; i < ci->children_num; i++) */
167 while (status == 0)
168 {
169 if (cm.regex == NULL)
170 {
171 WARNING ("tail plugin: `Regex' missing in `Match' block.");
172 status = -1;
173 break;
174 }
176 if (cm.type == NULL)
177 {
178 WARNING ("tail plugin: `Type' missing in `Match' block.");
179 status = -1;
180 break;
181 }
183 if (cm.flags == 0)
184 {
185 WARNING ("tail plugin: `DSType' missing in `Match' block.");
186 status = -1;
187 break;
188 }
190 break;
191 } /* while (status == 0) */
193 if (status == 0)
194 {
195 status = tail_match_add_match_simple (tm, cm.regex, cm.excluderegex,
196 cm.flags, "tail", plugin_instance, cm.type, cm.type_instance, interval);
198 if (status != 0)
199 {
200 ERROR ("tail plugin: tail_match_add_match_simple failed.");
201 }
202 }
204 sfree (cm.regex);
205 sfree (cm.excluderegex);
206 sfree (cm.type);
207 sfree (cm.type_instance);
209 return (status);
210 } /* int ctail_config_add_match */
212 static int ctail_config_add_file (oconfig_item_t *ci)
213 {
214 cu_tail_match_t *tm;
215 cdtime_t interval = 0;
216 char *plugin_instance = NULL;
217 int num_matches = 0;
218 int status;
219 int i;
221 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
222 {
223 WARNING ("tail plugin: `File' needs exactly one string argument.");
224 return (-1);
225 }
227 tm = tail_match_create (ci->values[0].value.string);
228 if (tm == NULL)
229 {
230 ERROR ("tail plugin: tail_match_create (%s) failed.",
231 ci->values[0].value.string);
232 return (-1);
233 }
235 status = 0;
236 for (i = 0; i < ci->children_num; i++)
237 {
238 oconfig_item_t *option = ci->children + i;
240 if (strcasecmp ("Instance", option->key) == 0)
241 status = cf_util_get_string (option, &plugin_instance);
242 else if (strcasecmp ("Interval", option->key) == 0)
243 cf_util_get_cdtime (option, &interval);
244 else if (strcasecmp ("Match", option->key) == 0)
245 {
246 status = ctail_config_add_match (tm, plugin_instance, option, interval);
247 if (status == 0)
248 num_matches++;
249 /* Be mild with failed matches.. */
250 status = 0;
251 }
252 else
253 {
254 status = -1;
255 }
257 if (status != 0)
258 break;
259 } /* for (i = 0; i < ci->children_num; i++) */
261 if (num_matches == 0)
262 {
263 ERROR ("tail plugin: No (valid) matches found for file `%s'.",
264 ci->values[0].value.string);
265 tail_match_destroy (tm);
266 return (-1);
267 }
268 else
269 {
270 cu_tail_match_t **temp;
272 temp = (cu_tail_match_t **) realloc (tail_match_list,
273 sizeof (cu_tail_match_t *) * (tail_match_list_num + 1));
274 if (temp == NULL)
275 {
276 ERROR ("tail plugin: realloc failed.");
277 tail_match_destroy (tm);
278 return (-1);
279 }
281 tail_match_list = temp;
282 tail_match_list[tail_match_list_num] = tm;
283 tail_match_list_intervals[tail_match_list_num] = interval;
284 tail_match_list_num++;
285 }
287 return (0);
288 } /* int ctail_config_add_file */
290 static int ctail_config (oconfig_item_t *ci)
291 {
292 int i;
294 for (i = 0; i < ci->children_num; i++)
295 {
296 oconfig_item_t *option = ci->children + i;
298 if (strcasecmp ("File", option->key) == 0)
299 ctail_config_add_file (option);
300 else
301 {
302 WARNING ("tail plugin: Option `%s' not allowed here.", option->key);
303 }
304 } /* for (i = 0; i < ci->children_num; i++) */
306 return (0);
307 } /* int ctail_config */
309 static int ctail_read (user_data_t *ud)
310 {
311 int status;
313 status = tail_match_read ((cu_tail_match_t *)ud->data);
314 if (status != 0)
315 {
316 ERROR ("tail plugin: tail_match_read failed.");
317 return (-1);
318 }
320 return (0);
321 } /* int ctail_read */
323 static int ctail_init (void)
324 {
325 struct timespec cb_interval;
326 char str[255];
327 user_data_t ud;
328 size_t i;
330 if (tail_match_list_num == 0)
331 {
332 WARNING ("tail plugin: File list is empty. Returning an error.");
333 return (-1);
334 }
336 for (i = 0; i < tail_match_list_num; i++)
337 {
338 ud.data = (void *)tail_match_list[i];
339 ssnprintf(str, sizeof(str), "tail-%zu", i);
340 CDTIME_T_TO_TIMESPEC (tail_match_list_intervals[i], &cb_interval);
341 plugin_register_complex_read (NULL, str, ctail_read, &cb_interval, &ud);
342 }
344 return (0);
345 } /* int ctail_init */
347 static int ctail_shutdown (void)
348 {
349 size_t i;
351 for (i = 0; i < tail_match_list_num; i++)
352 {
353 tail_match_destroy (tail_match_list[i]);
354 tail_match_list[i] = NULL;
355 }
356 sfree (tail_match_list);
357 tail_match_list_num = 0;
359 return (0);
360 } /* int ctail_shutdown */
362 void module_register (void)
363 {
364 plugin_register_complex_config ("tail", ctail_config);
365 plugin_register_init ("tail", ctail_init);
366 plugin_register_shutdown ("tail", ctail_shutdown);
367 } /* void module_register */
369 /* vim: set sw=2 sts=2 ts=8 : */