path: root/src/util/configuration.c

/*
     This file is part of GNUnet.
     (C) 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 2, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file src/util/configuration.c
 * @brief configuration management
 * @author Christian Grothoff
 */

#include "platform.h"
#include "gnunet_common.h"
#include "gnunet_util_lib.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_strings_lib.h"

#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)

#define LOG_STRERROR_FILE(kind,syscall,filename) GNUNET_log_from_strerror_file (kind, "util", syscall, filename)

/**
 * @brief configuration entry
 */
struct ConfigEntry
{

  /**
   * This is a linked list.
   */
  struct ConfigEntry *next;

  /**
   * key for this entry
   */
  char *key;

  /**
   * current, commited value
   */
  char *val;
};


/**
 * @brief configuration section
 */
struct ConfigSection
{
  /**
   * This is a linked list.
   */
  struct ConfigSection *next;

  /**
   * entries in the section
   */
  struct ConfigEntry *entries;

  /**
   * name of the section
   */
  char *name;
};


/**
 * @brief configuration data
 */
struct GNUNET_CONFIGURATION_Handle
{
  /**
   * Configuration sections.
   */
  struct ConfigSection *sections;

  /**
   * Modification indication since last save
   * GNUNET_NO if clean, GNUNET_YES if dirty,
   * GNUNET_SYSERR on error (i.e. last save failed)
   */
  int dirty;

};


/**
 * Used for diffing a configuration object against
 * the default one
 */
struct DiffHandle
{
  const struct GNUNET_CONFIGURATION_Handle *cfgDefault;
  struct GNUNET_CONFIGURATION_Handle *cfgDiff;
};



/**
 * Create a GNUNET_CONFIGURATION_Handle.
 *
 * @return fresh configuration object
 */
struct GNUNET_CONFIGURATION_Handle *
GNUNET_CONFIGURATION_create ()
{
  return GNUNET_malloc (sizeof (struct GNUNET_CONFIGURATION_Handle));
}


/**
 * Destroy configuration object.
 *
 * @param cfg configuration to destroy
 */
void
GNUNET_CONFIGURATION_destroy (struct GNUNET_CONFIGURATION_Handle *cfg)
{
  struct ConfigSection *sec;

  while (NULL != (sec = cfg->sections))
    GNUNET_CONFIGURATION_remove_section (cfg, sec->name);
  GNUNET_free (cfg);
}


/**
 * Parse a configuration file, add all of the options in the
 * file to the configuration environment.
 *
 * @param cfg configuration to update
 * @param filename name of the configuration file
 * @return GNUNET_OK on success, GNUNET_SYSERR on error
 */
int
GNUNET_CONFIGURATION_parse (struct GNUNET_CONFIGURATION_Handle *cfg,
                            const char *filename)
{
  int dirty;
  char line[256];
  char tag[64];
  char value[192];
  FILE *fp;
  unsigned int nr;
  int i;
  int emptyline;
  int ret;
  char *section;
  char *fn;

  fn =