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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 Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- 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
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @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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