1 /**
2 * collectd - src/configfile.c
3 * Copyright (C) 2005,2006 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 #include "collectd.h"
25 #include "liboconfig/oconfig.h"
27 #include "common.h"
28 #include "plugin.h"
29 #include "configfile.h"
30 #include "network.h"
32 #define ESCAPE_NULL(str) ((str) == NULL ? "(null)" : (str))
34 /*
35 * Private types
36 */
37 typedef struct cf_callback
38 {
39 const char *type;
40 int (*callback) (const char *, const char *);
41 const char **keys;
42 int keys_num;
43 struct cf_callback *next;
44 } cf_callback_t;
46 typedef struct cf_value_map_s
47 {
48 char *key;
49 int (*func) (const oconfig_item_t *);
50 } cf_value_map_t;
52 typedef struct cf_global_option_s
53 {
54 char *key;
55 char *value;
56 char *def;
57 } cf_global_option_t;
59 /*
60 * Prototypes of callback functions
61 */
62 static int dispatch_value_plugindir (const oconfig_item_t *ci);
63 static int dispatch_value_loadplugin (const oconfig_item_t *ci);
65 /*
66 * Private variables
67 */
68 static cf_callback_t *first_callback = NULL;
70 static cf_value_map_t cf_value_map[] =
71 {
72 {"PluginDir", dispatch_value_plugindir},
73 {"LoadPlugin", dispatch_value_loadplugin}
74 };
75 static int cf_value_map_num = STATIC_ARRAY_LEN (cf_value_map);
77 static cf_global_option_t cf_global_options[] =
78 {
79 {"BaseDir", NULL, PKGLOCALSTATEDIR},
80 {"LogFile", NULL, LOGFILE},
81 {"PIDFile", NULL, PIDFILE},
82 {"Hostname", NULL, NULL},
83 {"Interval", NULL, "10"}
84 };
85 static int cf_global_options_num = STATIC_ARRAY_LEN (cf_global_options);
87 /*
88 * Functions to handle register/unregister, search, and other plugin related
89 * stuff
90 */
91 static cf_callback_t *cf_search (const char *type)
92 {
93 cf_callback_t *cf_cb;
95 if (type == NULL)
96 return (NULL);
98 for (cf_cb = first_callback; cf_cb != NULL; cf_cb = cf_cb->next)
99 if (strcasecmp (cf_cb->type, type) == 0)
100 break;
102 return (cf_cb);
103 }
105 static int cf_dispatch (const char *type, const char *orig_key,
106 const char *orig_value)
107 {
108 cf_callback_t *cf_cb;
109 char *key;
110 char *value;
111 int ret;
112 int i;
114 DEBUG ("type = %s, key = %s, value = %s",
115 ESCAPE_NULL(type),
116 ESCAPE_NULL(orig_key),
117 ESCAPE_NULL(orig_value));
119 if ((cf_cb = cf_search (type)) == NULL)
120 {
121 WARNING ("Plugin `%s' did not register a callback.", type);
122 return (-1);
123 }
125 if ((key = strdup (orig_key)) == NULL)
126 return (1);
127 if ((value = strdup (orig_value)) == NULL)
128 {
129 free (key);
130 return (2);
131 }
133 ret = -1;
135 for (i = 0; i < cf_cb->keys_num; i++)
136 {
137 if (strcasecmp (cf_cb->keys[i], key) == 0)
138 {
139 ret = (*cf_cb->callback) (key, value);
140 break;
141 }
142 }
144 if (i >= cf_cb->keys_num)
145 WARNING ("Plugin `%s' did not register for value `%s'.", type, key);
147 free (key);
148 free (value);
150 DEBUG ("return (%i)", ret);
152 return (ret);
153 } /* int cf_dispatch */
155 static int dispatch_global_option (const oconfig_item_t *ci)
156 {
157 if (ci->values_num != 1)
158 return (-1);
159 if (ci->values[0].type != OCONFIG_TYPE_STRING)
160 return (-1);
162 return (global_option_set (ci->key, ci->values[0].value.string));
163 }
165 static int dispatch_value_plugindir (const oconfig_item_t *ci)
166 {
167 assert (strcasecmp (ci->key, "PluginDir") == 0);
169 if (ci->values_num != 1)
170 return (-1);
171 if (ci->values[0].type != OCONFIG_TYPE_STRING)
172 return (-1);
174 plugin_set_dir (ci->values[0].value.string);
175 return (0);
176 }
178 static int dispatch_value_loadplugin (const oconfig_item_t *ci)
179 {
180 assert (strcasecmp (ci->key, "LoadPlugin") == 0);
182 if (ci->values_num != 1)
183 return (-1);
184 if (ci->values[0].type != OCONFIG_TYPE_STRING)
185 return (-1);
187 return (plugin_load (ci->values[0].value.string));
188 } /* int dispatch_value_loadplugin */
190 static int dispatch_value_plugin (const char *plugin, oconfig_item_t *ci)
191 {
192 char buffer[4096];
193 char *buffer_ptr;
194 int buffer_free;
195 int i;
197 buffer_ptr = buffer;
198 buffer_free = sizeof (buffer);
200 for (i = 0; i < ci->values_num; i++)
201 {
202 int status = -1;
204 if (ci->values[i].type == OCONFIG_TYPE_STRING)
205 status = snprintf (buffer_ptr, buffer_free, " %s",
206 ci->values[i].value.string);
207 else if (ci->values[i].type == OCONFIG_TYPE_NUMBER)
208 status = snprintf (buffer_ptr, buffer_free, " %lf",
209 ci->values[i].value.number);
210 else if (ci->values[i].type == OCONFIG_TYPE_BOOLEAN)
211 status = snprintf (buffer_ptr, buffer_free, " %s",
212 ci->values[i].value.boolean
213 ? "true" : "false");
215 if ((status < 0) || (status >= buffer_free))
216 return (-1);
217 buffer_free -= status;
218 buffer_ptr += status;
219 }
220 /* skip the initial space */
221 buffer_ptr = buffer + 1;
223 return (cf_dispatch (plugin, ci->key, buffer_ptr));
224 } /* int plugin_conf_dispatch */
226 static int dispatch_value (const oconfig_item_t *ci)
227 {
228 int ret = -2;
229 int i;
231 for (i = 0; i < cf_value_map_num; i++)
232 if (strcasecmp (cf_value_map[i].key, ci->key) == 0)
233 {
234 ret = cf_value_map[i].func (ci);
235 break;
236 }
238 for (i = 0; i < cf_global_options_num; i++)
239 if (strcasecmp (cf_global_options[i].key, ci->key) == 0)
240 {
241 ret = dispatch_global_option (ci);
242 break;
243 }
245 return (ret);
246 } /* int dispatch_value */
248 static int dispatch_block_plugin (oconfig_item_t *ci)
249 {
250 int i;
251 char *name;
253 if (strcasecmp (ci->key, "Plugin") != 0)
254 return (-1);
255 if (ci->values_num != 1)
256 return (-1);
257 if (ci->values[0].type != OCONFIG_TYPE_STRING)
258 return (-1);
260 name = ci->values[0].value.string;
262 for (i = 0; i < ci->children_num; i++)
263 {
264 if (ci->children[i].children == NULL)
265 dispatch_value_plugin (name, ci->children + i);
266 else
267 {DEBUG ("No nested config blocks allow for plugins. Yet.");}
268 }
270 return (0);
271 }
274 static int dispatch_block (oconfig_item_t *ci)
275 {
276 if (strcasecmp (ci->key, "Plugin") == 0)
277 return (dispatch_block_plugin (ci));
279 return (0);
280 }
282 /*
283 * Public functions
284 */
285 int global_option_set (const char *option, const char *value)
286 {
287 int i;
289 DEBUG ("option = %s; value = %s;", option, value);
291 for (i = 0; i < cf_global_options_num; i++)
292 if (strcasecmp (cf_global_options[i].key, option) == 0)
293 break;
295 if (i >= cf_global_options_num)
296 return (-1);
298 if (cf_global_options[i].value != NULL)
299 free (cf_global_options[i].value);
301 if (value != NULL)
302 cf_global_options[i].value = strdup (value);
303 else
304 cf_global_options[i].value = NULL;
306 return (0);
307 }
309 const char *global_option_get (const char *option)
310 {
311 int i;
313 for (i = 0; i < cf_global_options_num; i++)
314 if (strcasecmp (cf_global_options[i].key, option) == 0)
315 break;
317 if (i >= cf_global_options_num)
318 return (NULL);
320 return ((cf_global_options[i].value != NULL)
321 ? cf_global_options[i].value
322 : cf_global_options[i].def);
323 } /* char *global_option_get */
325 void cf_unregister (const char *type)
326 {
327 cf_callback_t *this, *prev;
329 for (prev = NULL, this = first_callback;
330 this != NULL;
331 prev = this, this = this->next)
332 if (strcasecmp (this->type, type) == 0)
333 {
334 if (prev == NULL)
335 first_callback = this->next;
336 else
337 prev->next = this->next;
339 free (this);
340 break;
341 }
342 }
344 void cf_register (const char *type,
345 int (*callback) (const char *, const char *),
346 const char **keys, int keys_num)
347 {
348 cf_callback_t *cf_cb;
350 /* Remove this module from the list, if it already exists */
351 cf_unregister (type);
353 /* This pointer will be free'd in `cf_unregister' */
354 if ((cf_cb = (cf_callback_t *) malloc (sizeof (cf_callback_t))) == NULL)
355 return;
357 cf_cb->type = type;
358 cf_cb->callback = callback;
359 cf_cb->keys = keys;
360 cf_cb->keys_num = keys_num;
362 cf_cb->next = first_callback;
363 first_callback = cf_cb;
364 } /* void cf_register */
366 int cf_read (char *filename)
367 {
368 oconfig_item_t *conf;
369 int i;
371 conf = oconfig_parse_file (filename);
372 if (conf == NULL)
373 {
374 ERROR ("Unable to read config file %s.", filename);
375 return (-1);
376 }
378 for (i = 0; i < conf->children_num; i++)
379 {
380 if (conf->children[i].children == NULL)
381 dispatch_value (conf->children + i);
382 else
383 dispatch_block (conf->children + i);
384 }
386 return (0);
387 } /* int cf_read */