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/*
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 peerinfo-tool/gnunet-peerinfo_plugins.c
* @brief plugin management
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet-peerinfo_plugins.h"
#include "gnunet_transport_plugin.h"
#include "gnunet_hello_lib.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 cfg configuration to use
*/
void
GPI_plugins_load (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct TransportPlugin *plug;
struct TransportPlugin *next;
char *libname;
char *plugs;
char *pos;
if (NULL != plugins_head)
return; /* already loaded */
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (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 = cfg;
plug->env.cls = plug->short_name;
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
GPI_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 *
GPI_plugins_find (const char *name)
{
struct TransportPlugin *head = plugins_head;
char *stripped = GNUNET_strdup (name);
char *sep = strchr (stripped, '_');
if (NULL != sep)
sep[0] = '\0';
while (head != NULL)
{
if (head->short_name == strstr (head->short_name, stripped))
break;
head = head->next;
}
GNUNET_free (stripped);
if (NULL == head)
return NULL;
return head->api;
}
/* end of file gnunet-peerinfo_plugins.c */
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