2 * collectd - src/configfile.c
3 * Copyright (C) 2005,2006 Florian octo Forster
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.
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.
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
20 * Florian octo Forster <octo at verplant.org>
25 #include "liboconfig/oconfig.h"
29 #include "configfile.h"
31 #define ESCAPE_NULL(str) ((str) == NULL ? "(null)" : (str))
36 typedef struct cf_callback
39 int (*callback) (const char *, const char *);
42 struct cf_callback *next;
45 typedef struct cf_complex_callback_s
48 int (*callback) (oconfig_item_t *);
49 struct cf_complex_callback_s *next;
50 } cf_complex_callback_t;
52 typedef struct cf_value_map_s
55 int (*func) (const oconfig_item_t *);
58 typedef struct cf_global_option_s
66 * Prototypes of callback functions
68 static int dispatch_value_plugindir (const oconfig_item_t *ci);
69 static int dispatch_value_loadplugin (const oconfig_item_t *ci);
74 static cf_callback_t *first_callback = NULL;
75 static cf_complex_callback_t *complex_callback_head = NULL;
77 static cf_value_map_t cf_value_map[] =
79 {"PluginDir", dispatch_value_plugindir},
80 {"LoadPlugin", dispatch_value_loadplugin}
82 static int cf_value_map_num = STATIC_ARRAY_LEN (cf_value_map);
84 static cf_global_option_t cf_global_options[] =
86 {"BaseDir", NULL, PKGLOCALSTATEDIR},
87 {"PIDFile", NULL, PIDFILE},
88 {"Hostname", NULL, NULL},
89 {"FQDNLookup", NULL, "false"},
90 {"Interval", NULL, "10"},
91 {"ReadThreads", NULL, "5"},
92 {"TypesDB", NULL, PLUGINDIR"/types.db"} /* FIXME: Configure path */
94 static int cf_global_options_num = STATIC_ARRAY_LEN (cf_global_options);
97 * Functions to handle register/unregister, search, and other plugin related
100 static cf_callback_t *cf_search (const char *type)
102 cf_callback_t *cf_cb;
107 for (cf_cb = first_callback; cf_cb != NULL; cf_cb = cf_cb->next)
108 if (strcasecmp (cf_cb->type, type) == 0)
114 static int cf_dispatch (const char *type, const char *orig_key,
115 const char *orig_value)
117 cf_callback_t *cf_cb;
123 DEBUG ("type = %s, key = %s, value = %s",
125 ESCAPE_NULL(orig_key),
126 ESCAPE_NULL(orig_value));
128 if ((cf_cb = cf_search (type)) == NULL)
130 WARNING ("Plugin `%s' did not register a callback.", type);
134 if ((key = strdup (orig_key)) == NULL)
136 if ((value = strdup (orig_value)) == NULL)
144 for (i = 0; i < cf_cb->keys_num; i++)
146 if (strcasecmp (cf_cb->keys[i], key) == 0)
148 ret = (*cf_cb->callback) (key, value);
153 if (i >= cf_cb->keys_num)
154 WARNING ("Plugin `%s' did not register for value `%s'.", type, key);
159 DEBUG ("return (%i)", ret);
162 } /* int cf_dispatch */
164 static int dispatch_global_option (const oconfig_item_t *ci)
166 if (ci->values_num != 1)
168 if (ci->values[0].type == OCONFIG_TYPE_STRING)
169 return (global_option_set (ci->key, ci->values[0].value.string));
170 else if (ci->values[0].type == OCONFIG_TYPE_NUMBER)
173 snprintf (tmp, sizeof (tmp), "%lf", ci->values[0].value.number);
175 return (global_option_set (ci->key, tmp));
177 else if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
179 if (ci->values[0].value.boolean)
180 return (global_option_set (ci->key, "true"));
182 return (global_option_set (ci->key, "false"));
186 } /* int dispatch_global_option */
188 static int dispatch_value_plugindir (const oconfig_item_t *ci)
190 assert (strcasecmp (ci->key, "PluginDir") == 0);
192 if (ci->values_num != 1)
194 if (ci->values[0].type != OCONFIG_TYPE_STRING)
197 plugin_set_dir (ci->values[0].value.string);
201 static int dispatch_value_loadplugin (const oconfig_item_t *ci)
203 assert (strcasecmp (ci->key, "LoadPlugin") == 0);
205 if (ci->values_num != 1)
207 if (ci->values[0].type != OCONFIG_TYPE_STRING)
210 return (plugin_load (ci->values[0].value.string));
211 } /* int dispatch_value_loadplugin */
213 static int dispatch_value_plugin (const char *plugin, oconfig_item_t *ci)
221 buffer_free = sizeof (buffer);
223 for (i = 0; i < ci->values_num; i++)
227 if (ci->values[i].type == OCONFIG_TYPE_STRING)
228 status = snprintf (buffer_ptr, buffer_free, " %s",
229 ci->values[i].value.string);
230 else if (ci->values[i].type == OCONFIG_TYPE_NUMBER)
231 status = snprintf (buffer_ptr, buffer_free, " %lf",
232 ci->values[i].value.number);
233 else if (ci->values[i].type == OCONFIG_TYPE_BOOLEAN)
234 status = snprintf (buffer_ptr, buffer_free, " %s",
235 ci->values[i].value.boolean
238 if ((status < 0) || (status >= buffer_free))
240 buffer_free -= status;
241 buffer_ptr += status;
243 /* skip the initial space */
244 buffer_ptr = buffer + 1;
246 return (cf_dispatch (plugin, ci->key, buffer_ptr));
247 } /* int plugin_conf_dispatch */
249 static int dispatch_value (const oconfig_item_t *ci)
254 for (i = 0; i < cf_value_map_num; i++)
255 if (strcasecmp (cf_value_map[i].key, ci->key) == 0)
257 ret = cf_value_map[i].func (ci);
261 for (i = 0; i < cf_global_options_num; i++)
262 if (strcasecmp (cf_global_options[i].key, ci->key) == 0)
264 ret = dispatch_global_option (ci);
269 } /* int dispatch_value */
271 static int dispatch_block_plugin (oconfig_item_t *ci)
276 cf_complex_callback_t *cb;
278 if (strcasecmp (ci->key, "Plugin") != 0)
280 if (ci->values_num < 1)
282 if (ci->values[0].type != OCONFIG_TYPE_STRING)
285 name = ci->values[0].value.string;
287 /* Check for a complex callback first */
288 for (cb = complex_callback_head; cb != NULL; cb = cb->next)
289 if (strcasecmp (name, cb->type) == 0)
290 return (cb->callback (ci));
292 /* Hm, no complex plugin found. Dispatch the values one by one */
293 for (i = 0; i < ci->children_num; i++)
295 if (ci->children[i].children == NULL)
296 dispatch_value_plugin (name, ci->children + i);
298 {DEBUG ("No nested config blocks allow for this plugin.");}
305 static int dispatch_block (oconfig_item_t *ci)
307 if (strcasecmp (ci->key, "Plugin") == 0)
308 return (dispatch_block_plugin (ci));
313 #define CF_MAX_DEPTH 8
314 static oconfig_item_t *cf_read_file (const char *file, int depth);
316 static int cf_include_all (oconfig_item_t *root, int depth)
320 for (i = 0; i < root->children_num; i++)
325 /* Ignore all blocks, including `Include' blocks. */
326 if (root->children[i].children_num != 0)
329 if (strcasecmp (root->children[i].key, "Include") != 0)
332 old = root->children + i;
334 if ((old->values_num != 1)
335 || (old->values[0].type != OCONFIG_TYPE_STRING))
337 ERROR ("configfile: `Include' needs exactly one string argument.");
341 new = cf_read_file (old->values[0].value.string, depth + 1);
345 /* There are more children now. We need to expand
347 if (new->children_num > 1)
349 oconfig_item_t *temp;
351 DEBUG ("configfile: Resizing root-children from %i to %i elements.",
353 root->children_num + new->children_num - 1);
355 temp = (oconfig_item_t *) realloc (root->children,
356 sizeof (oconfig_item_t)
357 * (root->children_num + new->children_num - 1));
360 ERROR ("configfile: realloc failed.");
364 root->children = temp;
367 /* Clean up the old include directive while we still have a
369 DEBUG ("configfile: Cleaning up `old'");
370 /* sfree (old->values[0].value.string); */
373 /* If there are trailing children and the number of children
374 * changes, we need to move the trailing ones either one to the
375 * front or (new->num - 1) to the back */
376 if (((root->children_num - i) > 1)
377 && (new->children_num != 1))
379 DEBUG ("configfile: Moving trailing children.");
380 memmove (root->children + i + new->children_num,
381 root->children + i + 1,
382 sizeof (oconfig_item_t)
383 * (root->children_num - (i + 1)));
386 /* Now copy the new children to where the include statement was */
387 if (new->children_num > 0)
389 DEBUG ("configfile: Copying new children.");
390 memcpy (root->children + i,
392 sizeof (oconfig_item_t)
393 * new->children_num);
396 /* Adjust the number of children and the position in the list. */
397 root->children_num = root->children_num + new->children_num - 1;
398 i = i + new->children_num - 1;
400 /* Clean up the `new' struct. We set `new->children' to NULL so
401 * the stuff we've just copied pointers to isn't freed by
403 DEBUG ("configfile: Cleaning up `new'");
404 sfree (new->values); /* should be NULL anyway */
407 } /* for (i = 0; i < root->children_num; i++) */
410 } /* int cf_include_all */
412 static oconfig_item_t *cf_read_file (const char *file, int depth)
414 oconfig_item_t *root;
416 if (depth >= CF_MAX_DEPTH)
418 ERROR ("configfile: Not including `%s' because the maximum nesting depth has been reached.",
423 root = oconfig_parse_file (file);
426 ERROR ("configfile: Cannot read file `%s'.", file);
430 cf_include_all (root, depth);
433 } /* oconfig_item_t *cf_read_file */
438 int global_option_set (const char *option, const char *value)
442 DEBUG ("option = %s; value = %s;", option, value);
444 for (i = 0; i < cf_global_options_num; i++)
445 if (strcasecmp (cf_global_options[i].key, option) == 0)
448 if (i >= cf_global_options_num)
451 sfree (cf_global_options[i].value);
454 cf_global_options[i].value = strdup (value);
456 cf_global_options[i].value = NULL;
461 const char *global_option_get (const char *option)
465 for (i = 0; i < cf_global_options_num; i++)
466 if (strcasecmp (cf_global_options[i].key, option) == 0)
469 if (i >= cf_global_options_num)
472 return ((cf_global_options[i].value != NULL)
473 ? cf_global_options[i].value
474 : cf_global_options[i].def);
475 } /* char *global_option_get */
477 void cf_unregister (const char *type)
479 cf_callback_t *this, *prev;
481 for (prev = NULL, this = first_callback;
483 prev = this, this = this->next)
484 if (strcasecmp (this->type, type) == 0)
487 first_callback = this->next;
489 prev->next = this->next;
494 } /* void cf_unregister */
496 void cf_unregister_complex (const char *type)
498 cf_complex_callback_t *this, *prev;
500 for (prev = NULL, this = complex_callback_head;
502 prev = this, this = this->next)
503 if (strcasecmp (this->type, type) == 0)
506 complex_callback_head = this->next;
508 prev->next = this->next;
514 } /* void cf_unregister */
516 void cf_register (const char *type,
517 int (*callback) (const char *, const char *),
518 const char **keys, int keys_num)
520 cf_callback_t *cf_cb;
522 /* Remove this module from the list, if it already exists */
523 cf_unregister (type);
525 /* This pointer will be free'd in `cf_unregister' */
526 if ((cf_cb = (cf_callback_t *) malloc (sizeof (cf_callback_t))) == NULL)
530 cf_cb->callback = callback;
532 cf_cb->keys_num = keys_num;
534 cf_cb->next = first_callback;
535 first_callback = cf_cb;
536 } /* void cf_register */
538 int cf_register_complex (const char *type, int (*callback) (oconfig_item_t *))
540 cf_complex_callback_t *new;
542 new = (cf_complex_callback_t *) malloc (sizeof (cf_complex_callback_t));
546 new->type = strdup (type);
547 if (new->type == NULL)
553 new->callback = callback;
556 if (complex_callback_head == NULL)
558 complex_callback_head = new;
562 cf_complex_callback_t *last = complex_callback_head;
563 while (last->next != NULL)
569 } /* int cf_register_complex */
571 int cf_read (char *filename)
573 oconfig_item_t *conf;
576 conf = cf_read_file (filename, 0 /* depth */);
579 ERROR ("Unable to read config file %s.", filename);
583 for (i = 0; i < conf->children_num; i++)
585 if (conf->children[i].children == NULL)
586 dispatch_value (conf->children + i);
588 dispatch_block (conf->children + i);