1 /**
2 * collectd - src/configfile.c
3 * Copyright (C) 2005 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; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Florian octo Forster <octo at verplant.org>
21 **/
23 /* TODO
24 * make internal-only functions `static' */
26 #include "collectd.h"
28 #include "libconfig/libconfig.h"
30 #include "plugin.h"
31 #include "configfile.h"
32 #include "utils_debug.h"
34 #define SHORTOPT_NONE 0
36 #define ERR_NOT_NESTED "Sections cannot be nested.\n"
37 #define ERR_SECTION_ONLY "`%s' can only be used as section.\n"
38 #define ERR_NEEDS_ARG "Section `%s' needs an argument.\n"
39 #define ERR_NEEDS_SECTION "`%s' can only be used within a section.\n"
41 #ifdef HAVE_LIBRRD
42 extern int operating_mode;
43 #else
44 static int operating_mode = MODE_CLIENT;
45 #endif
47 typedef struct cf_callback
48 {
49 char *type;
50 int (*callback) (char *, char *);
51 char **keys;
52 int keys_num;
53 struct cf_callback *next;
54 } cf_callback_t;
56 static cf_callback_t *first_callback = NULL;
58 typedef struct cf_mode_item
59 {
60 char *key;
61 char *value;
62 int mode;
63 } cf_mode_item_t;
65 /* TODO
66 * - LogFile
67 */
68 static cf_mode_item_t cf_mode_list[] =
69 {
70 {"Server", NULL, MODE_CLIENT },
71 {"Port", NULL, MODE_CLIENT | MODE_SERVER },
72 {"PIDFile", PIDFILE, MODE_CLIENT | MODE_SERVER | MODE_LOCAL},
73 {"DataDir", PKGLOCALSTATEDIR, MODE_SERVER | MODE_LOCAL},
74 {"LogFile", LOGFILE, MODE_SERVER | MODE_SERVER | MODE_LOCAL},
75 };
76 static int cf_mode_num = 4;
78 static int nesting_depth = 0;
79 static char *current_module = NULL;
81 /* `cf_register' needs this prototype */
82 int cf_callback_plugin_dispatch (const char *, const char *, const char *,
83 const char *, lc_flags_t, void *);
85 /*
86 * Functions to handle register/unregister, search, and other plugin related
87 * stuff
88 */
89 cf_callback_t *cf_search (char *type)
90 {
91 cf_callback_t *cf_cb;
93 if (type == NULL)
94 return (NULL);
96 for (cf_cb = first_callback; cf_cb != NULL; cf_cb = cf_cb->next)
97 if (strcasecmp (cf_cb->type, type) == 0)
98 break;
100 return (cf_cb);
101 }
103 int cf_dispatch (char *type, const char *orig_key, const char *orig_value)
104 {
105 cf_callback_t *cf_cb;
106 char *key;
107 char *value;
108 int ret;
109 int i;
111 DBG ("type = %s, key = %s, value = %s", type, orig_key, orig_value);
113 if ((cf_cb = cf_search (type)) == NULL)
114 {
115 syslog (LOG_WARNING, "Plugin `%s' did not register a callback.\n", type);
116 return (-1);
117 }
119 if ((key = strdup (orig_key)) == NULL)
120 return (1);
121 if ((value = strdup (orig_value)) == NULL)
122 {
123 free (key);
124 return (2);
125 }
127 ret = -1;
129 for (i = 0; i < cf_cb->keys_num; i++)
130 {
131 if (strcasecmp (cf_cb->keys[i], key) == 0)
132 {
133 ret = (*cf_cb->callback) (key, value);
134 break;
135 }
136 }
138 if (i >= cf_cb->keys_num)
139 syslog (LOG_WARNING, "Plugin `%s' did not register for value `%s'.\n", type, key);
141 free (key);
142 free (value);
144 return (ret);
145 }
147 void cf_unregister (char *type)
148 {
149 cf_callback_t *this, *prev;
151 for (prev = NULL, this = first_callback;
152 this != NULL;
153 prev = this, this = this->next)
154 if (strcasecmp (this->type, type) == 0)
155 {
156 if (prev == NULL)
157 first_callback = this->next;
158 else
159 prev->next = this->next;
161 free (this);
162 break;
163 }
164 }
166 void cf_register (char *type,
167 int (*callback) (char *, char *),
168 char **keys, int keys_num)
169 {
170 cf_callback_t *cf_cb;
171 char buf[64];
172 int i;
174 /* Remove this module from the list, if it already exists */
175 cf_unregister (type);
177 /* This pointer will be free'd in `cf_unregister' */
178 if ((cf_cb = (cf_callback_t *) malloc (sizeof (cf_callback_t))) == NULL)
179 return;
181 cf_cb->type = type;
182 cf_cb->callback = callback;
183 cf_cb->keys = keys;
184 cf_cb->keys_num = keys_num;
186 cf_cb->next = first_callback;
187 first_callback = cf_cb;
189 for (i = 0; i < keys_num; i++)
190 {
191 if (snprintf (buf, 64, "Plugin.%s", keys[i]) < 64)
192 {
193 /* This may be called multiple times for the same
194 * `key', but apparently `lc_register_*' can handle
195 * it.. */
196 lc_register_callback (buf, SHORTOPT_NONE,
197 LC_VAR_STRING, cf_callback_plugin_dispatch,
198 NULL);
199 }
200 else
201 {
202 DBG ("Key was truncated: `%s'", keys[i]);
203 }
204 }
205 }
207 /*
208 * Other query functions
209 */
210 char *cf_get_mode_option (const char *key)
211 {
212 int i;
214 for (i = 0; i < cf_mode_num; i++)
215 {
216 if ((cf_mode_list[i].mode & operating_mode) == 0)
217 continue;
219 if (strcasecmp (cf_mode_list[i].key, key) == 0)
220 return (cf_mode_list[i].value);
221 }
223 return (NULL);
224 }
226 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
227 * Functions for the actual parsing *
228 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
230 /*
231 * `cf_callback_mode'
232 * Chose the `operating_mode'
233 *
234 * Mode `value'
235 */
236 int cf_callback_mode (const char *shortvar, const char *var,
237 const char *arguments, const char *value, lc_flags_t flags,
238 void *extra)
239 {
240 DBG ("shortvar = %s, var = %s, arguments = %s, value = %s, ...",
241 shortvar, var, arguments, value);
243 if (strcasecmp (value, "Client") == 0)
244 operating_mode = MODE_CLIENT;
245 else if (strcasecmp (value, "Server") == 0)
246 operating_mode = MODE_SERVER;
247 else if (strcasecmp (value, "Local") == 0)
248 operating_mode = MODE_LOCAL;
249 else
250 {
251 syslog (LOG_ERR, "Invalid value for config option `Mode': `%s'", value);
252 return (LC_CBRET_ERROR);
253 }
255 return (LC_CBRET_OKAY);
256 }
258 /*
259 * `cf_callback_mode_plugindir'
260 * Change the plugin directory
261 *
262 * <Mode xxx>
263 * PluginDir `value'
264 * </Mode>
265 */
266 int cf_callback_mode_plugindir (const char *shortvar, const char *var,
267 const char *arguments, const char *value, lc_flags_t flags,
268 void *extra)
269 {
270 DBG ("shortvar = %s, var = %s, arguments = %s, value = %s, ...",
271 shortvar, var, arguments, value);
273 plugin_set_dir (value);
275 return (LC_CBRET_OKAY);
276 }
278 int cf_callback_mode_option (const char *shortvar, const char *var,
279 const char *arguments, const char *value, lc_flags_t flags,
280 void *extra)
281 {
282 cf_mode_item_t *item;
284 DBG ("shortvar = %s, var = %s, arguments = %s, value = %s, ...",
285 shortvar, var, arguments, value);
287 if (extra == NULL)
288 {
289 fprintf (stderr, "No extra..?\n");
290 return (LC_CBRET_ERROR);
291 }
293 item = (cf_mode_item_t *) extra;
295 if (strcasecmp (item->key, shortvar))
296 {
297 fprintf (stderr, "Wrong extra..\n");
298 return (LC_CBRET_ERROR);
299 }
301 if ((operating_mode & item->mode) == 0)
302 {
303 fprintf (stderr, "Option `%s' is not valid in this mode!\n", shortvar);
304 return (LC_CBRET_ERROR);
305 }
307 if (item->value != NULL)
308 {
309 free (item->value);
310 item->value = NULL;
311 }
313 if ((item->value = strdup (value)) == NULL)
314 {
315 perror ("strdup");
316 return (LC_CBRET_ERROR);
317 }
319 return (LC_CBRET_OKAY);
320 }
322 /*
323 * `cf_callback_mode_loadmodule':
324 * Load a plugin.
325 *
326 * <Mode xxx>
327 * LoadPlugin `value'
328 * </Mode>
329 */
330 int cf_callback_mode_loadmodule (const char *shortvar, const char *var,
331 const char *arguments, const char *value, lc_flags_t flags,
332 void *extra)
333 {
334 DBG ("shortvar = %s, var = %s, arguments = %s, value = %s, ...",
335 shortvar, var, arguments, value);
337 if (plugin_load (value))
338 syslog (LOG_ERR, "plugin_load (%s): failed to load plugin", value);
340 /* Return `okay' even if there was an error, because it's not a syntax
341 * problem.. */
342 return (LC_CBRET_OKAY);
343 }
345 /*
346 * `cf_callback_mode_switch'
347 * Change the contents of the global variable `operating_mode'
348 *
349 * This should be command line options. One *can* do this in the config
350 * files, but I will not document this. Don't whine abount it not working as
351 * you expect if you do it anyways.
352 */
353 int cf_callback_mode_switch (const char *shortvar, const char *var,
354 const char *arguments, const char *value, lc_flags_t flags,
355 void *extra)
356 {
357 DBG ("shortvar = %s, var = %s, arguments = %s, value = %s, ...",
358 shortvar, var, arguments, value);
360 if (strcasecmp (shortvar, "Client") == 0)
361 operating_mode = MODE_CLIENT;
362 else if (strcasecmp (shortvar, "Local") == 0)
363 operating_mode = MODE_LOCAL;
364 else if (strcasecmp (shortvar, "Server") == 0)
365 operating_mode = MODE_SERVER;
366 else
367 {
368 fprintf (stderr, "cf_callback_mode_switch: Wrong mode!\n");
369 return (LC_CBRET_ERROR);
370 }
372 return (LC_CBRET_OKAY);
373 }
375 /*
376 * `cf_callback_plugin'
377 * Start/end section `plugin'
378 *
379 * <Plugin `arguments'>
380 * ...
381 * </Plugin>
382 */
383 int cf_callback_plugin (const char *shortvar, const char *var,
384 const char *arguments, const char *value, lc_flags_t flags,
385 void *extra)
386 {
387 DBG ("shortvar = %s, var = %s, arguments = %s, value = %s, ...",
388 shortvar, var, arguments, value);
390 if (flags == LC_FLAGS_SECTIONSTART)
391 {
392 if (nesting_depth != 0)
393 {
394 fprintf (stderr, ERR_NOT_NESTED);
395 return (LC_CBRET_ERROR);
396 }
398 if (arguments == NULL)
399 {
400 fprintf (stderr, ERR_NEEDS_ARG, shortvar);
401 return (LC_CBRET_ERROR);
402 }
404 if ((current_module = strdup (arguments)) == NULL)
405 {
406 perror ("strdup");
407 return (LC_CBRET_ERROR);
408 }
410 nesting_depth++;
412 if (cf_search (current_module) != NULL)
413 return (LC_CBRET_OKAY);
414 else
415 return (LC_CBRET_IGNORESECTION);
416 }
417 else if (flags == LC_FLAGS_SECTIONEND)
418 {
419 if (current_module != NULL)
420 {
421 free (current_module);
422 current_module = NULL;
423 }
425 nesting_depth--;
427 return (LC_CBRET_OKAY);
428 }
429 else
430 {
431 fprintf (stderr, ERR_SECTION_ONLY, shortvar);
432 return (LC_CBRET_ERROR);
433 }
434 }
436 /*
437 * `cf_callback_plugin_dispatch'
438 * Send options within `plugin' sections to the plugin that requests it.
439 *
440 * <Plugin `current_module'>
441 * `var' `value'
442 * </Plugin>
443 */
444 int cf_callback_plugin_dispatch (const char *shortvar, const char *var,
445 const char *arguments, const char *value, lc_flags_t flags,
446 void *extra)
447 {
448 DBG ("shortvar = %s, var = %s, arguments = %s, value = %s, ...",
449 shortvar, var, arguments, value);
451 if ((nesting_depth == 0) || (current_module == NULL))
452 {
453 fprintf (stderr, ERR_NEEDS_SECTION, shortvar);
454 return (LC_CBRET_ERROR);
455 }
457 /* Send the data to the plugin */
458 if (cf_dispatch (current_module, shortvar, value) < 0)
459 return (LC_CBRET_ERROR);
461 return (LC_CBRET_OKAY);
462 }
464 void cf_init (void)
465 {
466 static int run_once = 0;
467 int i;
469 if (run_once != 0)
470 return;
471 run_once = 1;
473 lc_register_callback ("Client", SHORTOPT_NONE, LC_VAR_NONE,
474 cf_callback_mode_switch, NULL);
475 lc_register_callback ("Local", SHORTOPT_NONE, LC_VAR_NONE,
476 cf_callback_mode_switch, NULL);
477 lc_register_callback ("Server", SHORTOPT_NONE, LC_VAR_NONE,
478 cf_callback_mode_switch, NULL);
480 lc_register_callback ("Mode", SHORTOPT_NONE, LC_VAR_STRING,
481 cf_callback_mode, NULL);
482 lc_register_callback ("Plugin", SHORTOPT_NONE, LC_VAR_SECTION,
483 cf_callback_plugin, NULL);
485 lc_register_callback ("PluginDir", SHORTOPT_NONE,
486 LC_VAR_STRING, cf_callback_mode_plugindir, NULL);
487 lc_register_callback ("LoadPlugin", SHORTOPT_NONE,
488 LC_VAR_STRING, cf_callback_mode_loadmodule, NULL);
490 for (i = 0; i < cf_mode_num; i++)
491 {
492 char longvar[256];
493 cf_mode_item_t *item;
495 item = &cf_mode_list[i];
497 if (snprintf (longvar, 256, "Mode.%s", item->key) >= 256)
498 continue;
500 lc_register_callback (longvar, SHORTOPT_NONE, LC_VAR_STRING,
501 cf_callback_mode_option, (void *) item);
502 }
503 }
505 int cf_read (char *filename)
506 {
507 cf_init ();
509 if (filename == NULL)
510 filename = CONFIGFILE;
512 DBG ("Starting to parse file `%s'", filename);
514 /* int lc_process_file(const char *appname, const char *pathname, lc_conf_type_t type); */
515 if (lc_process_file ("collectd", filename, LC_CONF_APACHE))
516 {
517 syslog (LOG_ERR, "lc_process_file (%s): %s", filename, lc_geterrstr ());
518 return (-1);
519 }
521 DBG ("Done parsing file `%s'", filename);
523 /* free memory and stuff */
524 lc_cleanup ();
526 return (0);
527 }