1 files changed, 267 insertions, 0 deletions

diff --git a/src/lib/gnsrecord/gnsrecord.c b/src/lib/gnsrecord/gnsrecord.c
new file mode 100644
index 000000000..c71dc1708
--- /dev/null
+++ b/src/lib/gnsrecord/gnsrecord.c
@@ -0,0 +1,267 @@
+/*
+     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"
+
+#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_in_context (GNUNET_OS_project_data_default (),
+                                     "libgnunet_plugin_gnsrecord_",
+                                     NULL,
+                                     &add_plugin,
+                                     NULL);
+}
+
+
+/**
+ * Dual function to #init().
+ */
+void __attribute__ ((destructor))
+GNSRECORD_fini ()
+{
+  struct Plugin *plugin;
+  const struct GNUNET_OS_ProjectData *pd = GNUNET_OS_project_data_get ();
+  const struct GNUNET_OS_ProjectData *dpd = GNUNET_OS_project_data_default ();
+
+  if (pd != dpd)
+    GNUNET_OS_init (dpd);
+
+  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 (gns_plugins);
+
+  if (pd != dpd)
+    GNUNET_OS_init (pd);
+
+  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;
+}
+
+
+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;
+}
+
+
+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 to the corresponding type string (e.g. 1 to "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;
+}
+
+
+enum GNUNET_GenericReturnValue
+GNUNET_GNSRECORD_is_critical (uint32_t type)
+{
+  struct Plugin *plugin;
+
+  if (GNUNET_GNSRECORD_TYPE_ANY == type)
+    return GNUNET_NO;
+  init ();
+  for (unsigned int i = 0; i < num_plugins; i++)
+  {
+    plugin = gns_plugins[i];
+    if (NULL == plugin->api->is_critical)
+      continue;
+    if (GNUNET_NO == plugin->api->is_critical (plugin->api->cls, type))
+      continue;
+    return GNUNET_YES;
+  }
+  return GNUNET_NO;
+}
+
+
+/* end of gnsrecord.c */