2 This file is part of GNUnet.
3 (C) 2006, 2008, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
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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.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file include/gnunet_configuration_lib.h
23 * @brief configuration API
25 * @author Christian Grothoff
28 #ifndef GNUNET_CONFIGURATION_LIB_H
29 #define GNUNET_CONFIGURATION_LIB_H
35 #if 0 /* keep Emacsens' auto-indent happy */
40 #include "gnunet_common.h"
41 #include "gnunet_time_lib.h"
44 * A configuration object.
46 struct GNUNET_CONFIGURATION_Handle;
49 * Create a new configuration object.
50 * @return fresh configuration object
52 struct GNUNET_CONFIGURATION_Handle *GNUNET_CONFIGURATION_create (void);
56 * Duplicate an existing configuration object.
58 * @param cfg configuration to duplicate
59 * @return duplicate configuration
61 struct GNUNET_CONFIGURATION_Handle *
62 GNUNET_CONFIGURATION_dup (const struct GNUNET_CONFIGURATION_Handle *cfg);
66 * Destroy configuration object.
68 * @param cfg configuration to destroy
70 void GNUNET_CONFIGURATION_destroy (struct GNUNET_CONFIGURATION_Handle *cfg);
74 * Load configuration. This function will first parse the
75 * defaults and then parse the specific configuration file
76 * to overwrite the defaults.
78 * @param cfg configuration to update
79 * @param filename name of the configuration file, NULL to load defaults
80 * @return GNUNET_OK on success, GNUNET_SYSERR on error
82 int GNUNET_CONFIGURATION_load (struct GNUNET_CONFIGURATION_Handle *cfg,
83 const char *filename);
87 * Parse a configuration file, add all of the options in the
88 * file to the configuration environment.
90 * @param cfg configuration to update
91 * @param filename name of the configuration file
92 * @return GNUNET_OK on success, GNUNET_SYSERR on error
94 int GNUNET_CONFIGURATION_parse (struct GNUNET_CONFIGURATION_Handle *cfg,
95 const char *filename);
99 * Write configuration file.
101 * @param cfg configuration to write
102 * @param filename where to write the configuration
103 * @return GNUNET_OK on success, GNUNET_SYSERR on error
105 int GNUNET_CONFIGURATION_write (struct GNUNET_CONFIGURATION_Handle *cfg,
106 const char *filename);
109 * Write only configuration entries that have been changed to configuration file
110 * @param cfgDefault default configuration
111 * @param cfgNew new configuration
112 * @param filename where to write the configuration diff between default and new
113 * @return GNUNET_OK on success, GNUNET_SYSERR on error
116 GNUNET_CONFIGURATION_write_diffs(const struct GNUNET_CONFIGURATION_Handle *cfgDefault,
117 const struct GNUNET_CONFIGURATION_Handle *cfgNew,
118 const char* filename);
121 * Test if there are configuration options that were
122 * changed since the last save.
124 * @param cfg configuration to inspect
125 * @return GNUNET_NO if clean, GNUNET_YES if dirty, GNUNET_SYSERR on error (i.e. last save failed)
127 int GNUNET_CONFIGURATION_is_dirty (const struct GNUNET_CONFIGURATION_Handle *cfg);
131 * Function to iterate over options.
134 * @param section name of the section
135 * @param option name of the option
136 * @param value value of the option
138 typedef void (*GNUNET_CONFIGURATION_Iterator)(void *cls,
145 * Function to iterate over section.
148 * @param section name of the section
150 typedef void (*GNUNET_CONFIGURATION_Section_Iterator)(void *cls,
151 const char *section);
155 * Iterate over all options in the configuration.
157 * @param cfg configuration to inspect
158 * @param iter function to call on each option
159 * @param iter_cls closure for iter
161 void GNUNET_CONFIGURATION_iterate (const struct GNUNET_CONFIGURATION_Handle *cfg,
162 GNUNET_CONFIGURATION_Iterator iter,
167 * Iterate over all sections in the configuration.
169 * @param cfg configuration to inspect
170 * @param iter function to call on each section
171 * @param iter_cls closure for iter
173 void GNUNET_CONFIGURATION_iterate_sections (const struct GNUNET_CONFIGURATION_Handle *cfg,
174 GNUNET_CONFIGURATION_Section_Iterator iter,
179 * Remove the given section and all options in it.
181 * @param cfg configuration to inspect
182 * @param section name of the section to remove
184 void GNUNET_CONFIGURATION_remove_section (struct GNUNET_CONFIGURATION_Handle *cfg,
185 const char *section);
188 * Get a configuration value that should be a number.
190 * @param cfg configuration to inspect
191 * @param section section of interest
192 * @param option option of interest
193 * @param number where to store the numeric value of the option
194 * @return GNUNET_OK on success, GNUNET_SYSERR on error
196 int GNUNET_CONFIGURATION_get_value_number (const struct GNUNET_CONFIGURATION_Handle
197 *cfg, const char *section,
199 unsigned long long *number);
203 * Get a configuration value that should be a relative time.
205 * @param cfg configuration to inspect
206 * @param section section of interest
207 * @param option option of interest
208 * @param time set to the time value stored in the configuration
209 * @return GNUNET_OK on success, GNUNET_SYSERR on error
211 int GNUNET_CONFIGURATION_get_value_time (const struct GNUNET_CONFIGURATION_Handle
212 *cfg, const char *section,
214 struct GNUNET_TIME_Relative *time);
218 * Test if we have a value for a particular option
220 * @param cfg configuration to inspect
221 * @param section section of interest
222 * @param option option of interest
223 * @return GNUNET_YES if so, GNUNET_NO if not.
225 int GNUNET_CONFIGURATION_have_value (const struct GNUNET_CONFIGURATION_Handle *cfg,
226 const char *section, const char *option);
230 * Get a configuration value that should be a string.
232 * @param cfg configuration to inspect
233 * @param section section of interest
234 * @param option option of interest
235 * @param value will be set to a freshly allocated configuration
236 * value, or NULL if option is not specified
237 * @return GNUNET_OK on success, GNUNET_SYSERR on error
239 int GNUNET_CONFIGURATION_get_value_string (const struct GNUNET_CONFIGURATION_Handle
240 *cfg, const char *section,
241 const char *option, char **value);
245 * Get a configuration value that should be the name of a file
248 * @param cfg configuration to inspect
249 * @param section section of interest
250 * @param option option of interest
251 * @param value will be set to a freshly allocated configuration
252 * value, or NULL if option is not specified
253 * @return GNUNET_OK on success, GNUNET_SYSERR on error
255 int GNUNET_CONFIGURATION_get_value_filename (const struct
256 GNUNET_CONFIGURATION_Handle *cfg,
262 * Iterate over the set of filenames stored in a configuration value.
264 * @param cfg configuration to inspect
265 * @param section section of interest
266 * @param option option of interest
267 * @param cb function to call on each filename
268 * @param cb_cls closure for cb
269 * @return number of filenames iterated over, -1 on error
271 int GNUNET_CONFIGURATION_iterate_value_filenames (const struct
272 GNUNET_CONFIGURATION_Handle
276 GNUNET_FileNameCallback
280 * Get a configuration value that should be in a set of
283 * @param cfg configuration to inspect
284 * @param section section of interest
285 * @param option option of interest
286 * @param choices NULL-terminated list of legal values
287 * @param value will be set to an entry in the legal list,
288 * or NULL if option is not specified and no default given
289 * @return GNUNET_OK on success, GNUNET_SYSERR on error
291 int GNUNET_CONFIGURATION_get_value_choice (const struct GNUNET_CONFIGURATION_Handle
292 *cfg, const char *section,
294 const char **choices,
298 * Get a configuration value that should be in a set of
301 * @param cfg configuration to inspect
302 * @param section section of interest
303 * @param option option of interest
304 * @return GNUNET_YES, GNUNET_NO or if option has no valid value, GNUNET_SYSERR
306 int GNUNET_CONFIGURATION_get_value_yesno (const struct GNUNET_CONFIGURATION_Handle
307 *cfg, const char *section,
311 * Expand an expression of the form "$FOO/BAR" to "DIRECTORY/BAR"
312 * where either in the "PATHS" section or the environtment
313 * "FOO" is set to "DIRECTORY".
315 * @param cfg configuration to use for path expansion
316 * @param orig string to $-expand (will be freed!)
317 * @return $-expanded string
319 char *GNUNET_CONFIGURATION_expand_dollar (const struct GNUNET_CONFIGURATION_Handle
324 * Set a configuration value that should be a number.
326 * @param cfg configuration to update
327 * @param section section of interest
328 * @param option option of interest
329 * @param number value to set
332 GNUNET_CONFIGURATION_set_value_number (struct GNUNET_CONFIGURATION_Handle
336 unsigned long long number);
340 * Set a configuration value that should be a string.
342 * @param cfg configuration to update
343 * @param section section of interest
344 * @param option option of interest
345 * @param value value to set
348 GNUNET_CONFIGURATION_set_value_string (struct GNUNET_CONFIGURATION_Handle
351 const char *option, const char *value);
354 * Remove a filename from a configuration value that
355 * represents a list of filenames
357 * @param cfg configuration to update
358 * @param section section of interest
359 * @param option option of interest
360 * @param value filename to remove
361 * @return GNUNET_OK on success,
362 * GNUNET_SYSERR if the filename is not in the list
364 int GNUNET_CONFIGURATION_remove_value_filename (struct
365 GNUNET_CONFIGURATION_Handle
372 * Append a filename to a configuration value that
373 * represents a list of filenames
375 * @param cfg configuration to update
376 * @param section section of interest
377 * @param option option of interest
378 * @param value filename to append
379 * @return GNUNET_OK on success,
380 * GNUNET_SYSERR if the filename already in the list
382 int GNUNET_CONFIGURATION_append_value_filename (struct
383 GNUNET_CONFIGURATION_Handle
384 *cfg, const char *section,
389 #if 0 /* keep Emacsens' auto-indent happy */