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
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);
110 * Test if there are configuration options that were
111 * changed since the last save.
113 * @param cfg configuration to inspect
114 * @return GNUNET_NO if clean, GNUNET_YES if dirty, GNUNET_SYSERR on error (i.e. last save failed)
116 int GNUNET_CONFIGURATION_is_dirty (const struct GNUNET_CONFIGURATION_Handle *cfg);
120 * Function to iterate over options.
123 * @param section name of the section
124 * @param option name of the option
125 * @param value value of the option
127 typedef void (*GNUNET_CONFIGURATION_Iterator)(void *cls,
134 * Iterate over all options in the configuration.
136 * @param cfg configuration to inspect
137 * @param iter function to call on each option
138 * @param iter_cls closure for iter
140 void GNUNET_CONFIGURATION_iterate (const struct GNUNET_CONFIGURATION_Handle *cfg,
141 GNUNET_CONFIGURATION_Iterator iter,
146 * Get a configuration value that should be a number.
148 * @param cfg configuration to inspect
149 * @param section section of interest
150 * @param option option of interest
151 * @param number where to store the numeric value of the option
152 * @return GNUNET_OK on success, GNUNET_SYSERR on error
154 int GNUNET_CONFIGURATION_get_value_number (const struct GNUNET_CONFIGURATION_Handle
155 *cfg, const char *section,
157 unsigned long long *number);
161 * Get a configuration value that should be a relative time.
163 * @param cfg configuration to inspect
164 * @param section section of interest
165 * @param option option of interest
166 * @param time set to the time value stored in the configuration
167 * @return GNUNET_OK on success, GNUNET_SYSERR on error
169 int GNUNET_CONFIGURATION_get_value_time (const struct GNUNET_CONFIGURATION_Handle
170 *cfg, const char *section,
172 struct GNUNET_TIME_Relative *time);
176 * Test if we have a value for a particular option
178 * @param cfg configuration to inspect
179 * @param section section of interest
180 * @param option option of interest
181 * @return GNUNET_YES if so, GNUNET_NO if not.
183 int GNUNET_CONFIGURATION_have_value (const struct GNUNET_CONFIGURATION_Handle *cfg,
184 const char *section, const char *option);
188 * Get a configuration value that should be a string.
190 * @param cfg configuration to inspect
191 * @param section section of interest
192 * @param option option of interest
193 * @param value will be set to a freshly allocated configuration
194 * value, or NULL if option is not specified
195 * @return GNUNET_OK on success, GNUNET_SYSERR on error
197 int GNUNET_CONFIGURATION_get_value_string (const struct GNUNET_CONFIGURATION_Handle
198 *cfg, const char *section,
199 const char *option, char **value);
203 * Get a configuration value that should be the name of a file
206 * @param cfg configuration to inspect
207 * @param section section of interest
208 * @param option option of interest
209 * @param value will be set to a freshly allocated configuration
210 * value, or NULL if option is not specified
211 * @return GNUNET_OK on success, GNUNET_SYSERR on error
213 int GNUNET_CONFIGURATION_get_value_filename (const struct
214 GNUNET_CONFIGURATION_Handle *cfg,
220 * Iterate over the set of filenames stored in a configuration value.
222 * @param cfg configuration to inspect
223 * @param section section of interest
224 * @param option option of interest
225 * @param cb function to call on each filename
226 * @param cb_cls closure for cb
227 * @return number of filenames iterated over, -1 on error
229 int GNUNET_CONFIGURATION_iterate_value_filenames (const struct
230 GNUNET_CONFIGURATION_Handle
234 GNUNET_FileNameCallback
238 * Get a configuration value that should be in a set of
241 * @param cfg configuration to inspect
242 * @param section section of interest
243 * @param option option of interest
244 * @param choices NULL-terminated list of legal values
245 * @param value will be set to an entry in the legal list,
246 * or NULL if option is not specified and no default given
247 * @return GNUNET_OK on success, GNUNET_SYSERR on error
249 int GNUNET_CONFIGURATION_get_value_choice (const struct GNUNET_CONFIGURATION_Handle
250 *cfg, const char *section,
252 const char **choices,
256 * Get a configuration value that should be in a set of
259 * @param cfg configuration to inspect
260 * @param section section of interest
261 * @param option option of interest
262 * @return GNUNET_YES, GNUNET_NO or if option has no valid value, GNUNET_SYSERR
264 int GNUNET_CONFIGURATION_get_value_yesno (const struct GNUNET_CONFIGURATION_Handle
265 *cfg, const char *section,
269 * Expand an expression of the form "$FOO/BAR" to "DIRECTORY/BAR"
270 * where either in the "PATHS" section or the environtment
271 * "FOO" is set to "DIRECTORY".
273 * @param cfg configuration to use for path expansion
274 * @param orig string to $-expand (will be freed!)
275 * @return $-expanded string
277 char *GNUNET_CONFIGURATION_expand_dollar (const struct GNUNET_CONFIGURATION_Handle
282 * Set a configuration value that should be a number.
284 * @param cfg configuration to update
285 * @param section section of interest
286 * @param option option of interest
287 * @param number value to set
290 GNUNET_CONFIGURATION_set_value_number (struct GNUNET_CONFIGURATION_Handle
294 unsigned long long number);
298 * Set a configuration value that should be a string.
300 * @param cfg configuration to update
301 * @param section section of interest
302 * @param option option of interest
303 * @param value value to set
306 GNUNET_CONFIGURATION_set_value_string (struct GNUNET_CONFIGURATION_Handle
309 const char *option, const char *value);
312 * Remove a filename from a configuration value that
313 * represents a list of filenames
315 * @param cfg configuration to update
316 * @param section section of interest
317 * @param option option of interest
318 * @param value filename to remove
319 * @return GNUNET_OK on success,
320 * GNUNET_SYSERR if the filename is not in the list
322 int GNUNET_CONFIGURATION_remove_value_filename (struct
323 GNUNET_CONFIGURATION_Handle
330 * Append a filename to a configuration value that
331 * represents a list of filenames
333 * @param cfg configuration to update
334 * @param section section of interest
335 * @param option option of interest
336 * @param value filename to append
337 * @return GNUNET_OK on success,
338 * GNUNET_SYSERR if the filename already in the list
340 int GNUNET_CONFIGURATION_append_value_filename (struct
341 GNUNET_CONFIGURATION_Handle
342 *cfg, const char *section,
347 #if 0 /* keep Emacsens' auto-indent happy */