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/*
This file is part of GNUnet.
Copyright (C) 2009-2013 GNUnet e.V.
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 3, 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file gnsrecord/gnsrecord.c
* @brief API to access GNS record data
* @author Martin Schanzenbach
* @author Matthias Wachs
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_constants.h"
#include "gnunet_gnsrecord_lib.h"
#include "gnunet_gnsrecord_plugin.h"
#include "gnunet_tun_lib.h"
#define LOG(kind,...) GNUNET_log_from (kind, "gnsrecord",__VA_ARGS__)
/**
* Handle for a plugin.
*/
struct Plugin
{
/**
* Name of the shared library.
*/
char *library_name;
/**
* Plugin API.
*/
struct GNUNET_GNSRECORD_PluginFunctions *api;
};
/**
* Array of our plugins.
*/
static struct Plugin **gns_plugins;
/**
* Size of the 'plugins' array.
*/
static unsigned int num_plugins;
/**
* Global to mark if we've run the initialization.
*/
static int once;
/**
* Add a plugin to the list managed by the block library.
*
* @param cls NULL
* @param library_name name of the plugin
* @param lib_ret the plugin API
*/
static void
add_plugin (void *cls,
const char *library_name,
void *lib_ret)
{
struct GNUNET_GNSRECORD_PluginFunctions *api = lib_ret;
struct Plugin *plugin;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Loading block plugin `%s'\n",
library_name);
plugin = GNUNET_new (struct Plugin);
plugin->api = api;
plugin->library_name = GNUNET_strdup (library_name);
GNUNET_array_append (gns_plugins, num_plugins, plugin);
}
/**
* Loads all plugins (lazy initialization).
*/
static void
init ()
{
if (1 == once)
return;
once = 1;
GNUNET_PLUGIN_load_all ("libgnunet_plugin_gnsrecord_", NULL,
&add_plugin, NULL);
}
/**
* Dual function to #init().
*/
void __attribute__ ((destructor))
GNSRECORD_fini ()
{
struct Plugin *plugin;
for (unsigned int i = 0; i < num_plugins; i++)
{
plugin = gns_plugins[i];
GNUNET_break (NULL ==
GNUNET_PLUGIN_unload (plugin->library_name,
plugin->api));
GNUNET_free (plugin->library_name);
GNUNET_free (plugin);
}
GNUNET_free_non_null (gns_plugins);
gns_plugins = NULL;
once = 0;
num_plugins = 0;
}
/**
* Convert the 'value' of a record to a string.
*
* @param type type of the record
* @param data value in binary encoding
* @param data_size number of bytes in @a data
* @return NULL on error, otherwise human-readable representation of the value
*/
char *
GNUNET_GNSRECORD_value_to_string (uint32_t type,
const void *data,
size_t data_size)
{
struct Plugin *plugin;
char *ret;
init ();
for (unsigned int i = 0; i < num_plugins; i++)
{
plugin = gns_plugins[i];
if (NULL != (ret = plugin->api->value_to_string (plugin->api->cls,
type,
data,
data_size)))
return ret;
}
return NULL;
}
/**
* Convert human-readable version of a 'value' of a record to the binary
* representation.
*
* @param type type of the record
* @param s human-readable string
* @param data set to value in binary encoding (will be allocated)
* @param data_size set to number of bytes in @a data
* @return #GNUNET_OK on success
*/
int
GNUNET_GNSRECORD_string_to_value (uint32_t type,
const char *s,
void **data,
size_t *data_size)
{
struct Plugin *plugin;
init ();
for (unsigned int i = 0; i < num_plugins; i++)
{
plugin = gns_plugins[i];
if (GNUNET_OK == plugin->api->string_to_value (plugin->api->cls,
type,
s,
data,
data_size))
return GNUNET_OK;
}
return GNUNET_SYSERR;
}
/**
* Convert a type name (i.e. "AAAA") to the corresponding number.
*
* @param dns_typename name to convert
* @return corresponding number, UINT32_MAX on error
*/
uint32_t
GNUNET_GNSRECORD_typename_to_number (const char *dns_typename)
{
struct Plugin *plugin;
uint32_t ret;
if (0 == strcasecmp (dns_typename,
"ANY"))
return GNUNET_GNSRECORD_TYPE_ANY;
init ();
for (unsigned int i = 0; i < num_plugins; i++)
{
plugin = gns_plugins[i];
if (UINT32_MAX != (ret = plugin->api->typename_to_number (plugin->api->cls,
dns_typename)))
return ret;
}
return UINT32_MAX;
}
/**
* Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
*
* @param type number of a type to convert
* @return corresponding typestring, NULL on error
*/
const char *
GNUNET_GNSRECORD_number_to_typename (uint32_t type)
{
struct Plugin *plugin;
const char * ret;
if (GNUNET_GNSRECORD_TYPE_ANY == type)
return "ANY";
init ();
for (unsigned int i = 0; i < num_plugins; i++)
{
plugin = gns_plugins[i];
if (NULL != (ret = plugin->api->number_to_typename (plugin->api->cls,
type)))
return ret;
}
return NULL;
}
/* end of gnsrecord.c */
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