1 files changed, 230 insertions, 0 deletions
diff --git a/src/transport/gnunet-service-transport_plugins.c b/src/transport/gnunet-service-transport_plugins.c
new file mode 100644
index 0000000..fc14b6e
--- /dev/null
+++ b/src/transport/gnunet-service-transport_plugins.c
@@ -0,0 +1,230 @@
+/*
+     This file is part of GNUnet.
+     (C) 2010,2011 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 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., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file transport/gnunet-service-transport_plugins.c
+ * @brief plugin management
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet-service-transport.h"
+#include "gnunet-service-transport_hello.h"
+#include "gnunet-service-transport_plugins.h"
+
+/**
+ * Entry in doubly-linked list of all of our plugins.
+ */
+struct TransportPlugin
+{
+  /**
+   * This is a doubly-linked list.
+   */
+  struct TransportPlugin *next;
+
+  /**
+   * This is a doubly-linked list.
+   */
+  struct TransportPlugin *prev;
+
+  /**
+   * API of the transport as returned by the plugin's
+   * initialization function.
+   */
+  struct GNUNET_TRANSPORT_PluginFunctions *api;
+
+  /**
+   * Short name for the plugin (i.e. "tcp").
+   */
+  char *short_name;
+
+  /**
+   * Name of the library (i.e. "gnunet_plugin_transport_tcp").
+   */
+  char *lib_name;
+
+  /**
+   * Environment this transport service is using
+   * for this plugin.
+   */
+  struct GNUNET_TRANSPORT_PluginEnvironment env;
+
+};
+
+/**
+ * Head of DLL of all loaded plugins.
+ */
+static struct TransportPlugin *plugins_head;
+
+/**
+ * Head of DLL of all loaded plugins.
+ */
+static struct TransportPlugin *plugins_tail;
+
+
+
+/**
+ * Load and initialize all plugins.  The respective functions will be
+ * invoked by the plugins when the respective events happen.  The
+ * closure will be set to a 'const char*' containing the name of the
+ * plugin that caused the call.
+ *
+ * @param recv_cb function to call when data is received
+ * @param address_cb function to call when our public addresses changed
+ * @param session_end_cb function to call when a session was terminated
+ * @param address_type_cb function to call when a address type is requested
+ */
+void
+GST_plugins_load (GNUNET_TRANSPORT_PluginReceiveCallback recv_cb,
+                  GNUNET_TRANSPORT_AddressNotification address_cb,
+                  GNUNET_TRANSPORT_SessionEnd session_end_cb,
+                  GNUNET_TRANSPORT_AddressToType address_type_cb)
+{
+  struct TransportPlugin *plug;
+  struct TransportPlugin *next;
+  unsigned long long tneigh;
+  char *libname;
+  char *plugs;
+  char *pos;
+
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_number (GST_cfg, "TRANSPORT",
+                                             "NEIGHBOUR_LIMIT", &tneigh))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _("Transport service is lacking NEIGHBOUR_LIMIT option.\n"));
+    return;
+  }
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_string (GST_cfg, "TRANSPORT", "PLUGINS",
+                                             &plugs))
+    return;
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Starting transport plugins `%s'\n"),
+              plugs);
+  for (pos = strtok (plugs, " "); pos != NULL; pos = strtok (NULL, " "))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Loading `%s' transport plugin\n"),
+                pos);
+    GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", pos);
+    plug = GNUNET_malloc (sizeof (struct TransportPlugin));
+    plug->short_name = GNUNET_strdup (pos);
+    plug->lib_name = libname;
+    plug->env.cfg = GST_cfg;
+    plug->env.my_identity = &GST_my_identity;
+    plug->env.get_our_hello = &GST_hello_get;
+    plug->env.cls = plug->short_name;
+    plug->env.receive = recv_cb;
+    plug->env.notify_address = address_cb;
+    plug->env.session_end = session_end_cb;
+    plug->env.get_address_type = address_type_cb;
+    plug->env.max_connections = tneigh;
+    plug->env.stats = GST_stats;
+    GNUNET_CONTAINER_DLL_insert (plugins_head, plugins_tail, plug);
+  }
+  GNUNET_free (plugs);
+  next = plugins_head;
+  while (next != NULL)
+  {
+    plug = next;
+    next = plug->next;
+    plug->api = GNUNET_PLUGIN_load (plug->lib_name, &plug->env);
+    if (plug->api == NULL)
+    {
+      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                  _("Failed to load transport plugin for `%s'\n"),
+                  plug->lib_name);
+      GNUNET_CONTAINER_DLL_remove (plugins_head, plugins_tail, plug);
+      GNUNET_free (plug->short_name);
+      GNUNET_free (plug->lib_name);
+      GNUNET_free (plug);
+    }
+  }
+}
+
+
+/**
+ * Unload all plugins
+ */
+void
+GST_plugins_unload ()
+{
+  struct TransportPlugin *plug;
+
+  while (NULL != (plug = plugins_head))
+  {
+    GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
+    GNUNET_free (plug->lib_name);
+    GNUNET_free (plug->short_name);
+    GNUNET_CONTAINER_DLL_remove (plugins_head, plugins_tail, plug);
+    GNUNET_free (plug);
+  }
+}
+
+
+/**
+ * Obtain the plugin API based on a plugin name.
+ *
+ * @param name name of the plugin
+ * @return the plugin's API, NULL if the plugin is not loaded
+ */
+struct GNUNET_TRANSPORT_PluginFunctions *
+GST_plugins_find (const char *name)
+{
+  struct TransportPlugin *head = plugins_head;
+
+  while ((head != NULL) && (0 != strcmp (name, head->short_name)))
+    head = head->next;
+  if (NULL == head)
+    return NULL;
+  return head->api;
+}
+
+
+/**
+ * Convert a given address to a human-readable format.  Note that the
+ * return value will be overwritten on the next call to this function.
+ *
+ * @param address the address to convert
+ * @return statically allocated (!) human-readable address
+ */
+const char *
+GST_plugins_a2s (const struct GNUNET_HELLO_Address *address)
+{
+  struct GNUNET_TRANSPORT_PluginFunctions *api;
+  static char unable_to_show[1024];
+
+  if (address == NULL)
+    return "<inbound>";
+  api = GST_plugins_find (address->transport_name);
+  if (NULL == api)
+    return "<plugin unknown>";
+  if (0 == address->address_length)
+  {
+    GNUNET_snprintf (unable_to_show, sizeof (unable_to_show),
+                     "<unable to stringify %u-byte long address of %s transport>",
+                     (unsigned int) address->address_length,
+                     address->transport_name);
+    return unable_to_show;
+  }
+  return api->address_to_string (NULL, address->address,
+                                 address->address_length);
+}
+
+
+/* end of file gnunet-service-transport_plugins.c */