2 This file is part of GNUnet.
3 Copyright (C) 2010-2014 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/gnunet-service-transport_plugins.c
23 * @brief plugin management
24 * @author Christian Grothoff
27 #include "gnunet-service-transport.h"
28 #include "gnunet-service-transport_hello.h"
29 #include "gnunet-service-transport_plugins.h"
32 * Entry in doubly-linked list of all of our plugins.
34 struct TransportPlugin
37 * This is a doubly-linked list.
39 struct TransportPlugin *next;
42 * This is a doubly-linked list.
44 struct TransportPlugin *prev;
47 * API of the transport as returned by the plugin's
48 * initialization function.
50 struct GNUNET_TRANSPORT_PluginFunctions *api;
53 * Short name for the plugin (i.e. "tcp").
58 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
63 * Environment this transport service is using
66 struct GNUNET_TRANSPORT_PluginEnvironment env;
71 * Head of DLL of all loaded plugins.
73 static struct TransportPlugin *plugins_head;
76 * Head of DLL of all loaded plugins.
78 static struct TransportPlugin *plugins_tail;
82 * Load and initialize all plugins. The respective functions will be
83 * invoked by the plugins when the respective events happen. The
84 * closure will be set to a 'const char*' containing the name of the
85 * plugin that caused the call.
87 * @param recv_cb function to call when data is received
88 * @param address_cb function to call when our public addresses changed
89 * @param session_start_cb function to call when a session was created
90 * @param session_end_cb function to call when a session was terminated
91 * @param address_type_cb function to call when a address type is requested
92 * @param metric_update_cb function to call when address metrics change
95 GST_plugins_load (GNUNET_TRANSPORT_PluginReceiveCallback recv_cb,
96 GNUNET_TRANSPORT_AddressNotification address_cb,
97 GNUNET_TRANSPORT_SessionStart session_start_cb,
98 GNUNET_TRANSPORT_SessionEnd session_end_cb,
99 GNUNET_TRANSPORT_AddressToType address_type_cb,
100 GNUNET_TRANSPORT_UpdateAddressMetrics metric_update_cb)
102 struct TransportPlugin *plug;
103 struct TransportPlugin *next;
104 unsigned long long tneigh;
111 GNUNET_CONFIGURATION_get_value_number (GST_cfg,
116 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
117 _("Transport service is lacking NEIGHBOUR_LIMIT option.\n"));
121 GNUNET_CONFIGURATION_get_value_string (GST_cfg,
126 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
127 _("Starting transport plugins `%s'\n"),
129 for (pos = strtok (plugs, " "); pos != NULL; pos = strtok (NULL, " "))
131 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
132 _("Loading `%s' transport plugin\n"),
134 GNUNET_asprintf (&libname,
135 "libgnunet_plugin_transport_%s",
137 plug = GNUNET_new (struct TransportPlugin);
138 plug->short_name = GNUNET_strdup (pos);
139 plug->lib_name = libname;
140 plug->env.cfg = GST_cfg;
141 plug->env.my_identity = &GST_my_identity;
142 plug->env.get_our_hello = &GST_hello_get;
143 plug->env.cls = plug->short_name;
144 plug->env.receive = recv_cb;
145 plug->env.notify_address = address_cb;
146 plug->env.session_start = session_start_cb;
147 plug->env.session_end = session_end_cb;
148 plug->env.get_address_type = address_type_cb;
149 plug->env.update_address_metrics = metric_update_cb;
150 plug->env.max_connections = tneigh;
151 plug->env.stats = GST_stats;
152 GNUNET_CONTAINER_DLL_insert (plugins_head,
162 plug->api = GNUNET_PLUGIN_load (plug->lib_name,
164 if (NULL == plug->api)
166 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
167 _("Failed to load transport plugin for `%s'\n"),
169 GNUNET_CONTAINER_DLL_remove (plugins_head,
172 GNUNET_free (plug->short_name);
173 GNUNET_free (plug->lib_name);
178 if (NULL == plug->api->address_pretty_printer)
181 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
182 _("Missing function `%s' in transport plugin for `%s'\n"),
183 "address_pretty_printer",
186 if (NULL == plug->api->address_to_string)
189 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
190 _("Missing function `%s' in transport plugin for `%s'\n"),
194 if (NULL == plug->api->string_to_address)
197 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
198 _("Missing function `%s' in transport plugin for `%s'\n"),
202 if (NULL == plug->api->check_address)
205 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
206 _("Missing function `%s' in transport plugin for `%s'\n"),
210 if (NULL == plug->api->get_session)
213 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
214 _("Missing function `%s' in transport plugin for `%s'\n"),
218 if (NULL == plug->api->get_network)
221 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
222 _("Missing function `%s' in transport plugin for `%s'\n"),
226 if (NULL == plug->api->send)
229 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
230 _("Missing function `%s' in transport plugin for `%s'\n"),
234 if (NULL == plug->api->disconnect_peer)
237 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
238 _("Missing function `%s' in transport plugin for `%s'\n"),
242 if (NULL == plug->api->disconnect_session)
245 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
246 _("Missing function `%s' in transport plugin for `%s'\n"),
247 "disconnect_session",
250 if (NULL == plug->api->query_keepalive_factor)
253 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
254 _("Missing function `%s' in transport plugin for `%s'\n"),
255 "query_keepalive_factor",
258 if (NULL == plug->api->update_session_timeout)
261 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
262 _("Missing function `%s' in transport plugin for `%s'\n"),
263 "update_session_timeout",
266 if (GNUNET_YES == fail)
268 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
269 _("Did not load plugin `%s' due to missing functions\n"),
271 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
272 GNUNET_CONTAINER_DLL_remove (plugins_head,
275 GNUNET_free (plug->short_name);
276 GNUNET_free (plug->lib_name);
287 GST_plugins_unload ()
289 struct TransportPlugin *plug;
291 while (NULL != (plug = plugins_head))
293 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
294 GNUNET_free (plug->lib_name);
295 GNUNET_free (plug->short_name);
296 GNUNET_CONTAINER_DLL_remove (plugins_head, plugins_tail, plug);
303 * Obtain the plugin API based on a plugin name.
305 * @param name name of the plugin
306 * @return the plugin's API, NULL if the plugin is not loaded
308 struct GNUNET_TRANSPORT_PluginFunctions *
309 GST_plugins_find (const char *name)
311 struct TransportPlugin *pos;
313 for (pos = plugins_head; NULL != pos; pos = pos->next)
314 if (0 == strcmp (name, pos->short_name))
323 * Obtain the plugin API based on a the stripped plugin name after the underscore.
325 * Example: GST_plugins_printer_find (http_client) will return all plugins
326 * starting with the prefix "http":
327 * http_client or server if loaded
329 * @param name name of the plugin
330 * @return the plugin's API, NULL if the plugin is not loaded
332 struct GNUNET_TRANSPORT_PluginFunctions *
333 GST_plugins_printer_find (const char *name)
335 struct TransportPlugin *pos;
336 char *stripped = GNUNET_strdup (name);
337 char *sep = strchr (stripped, '_');
341 for (pos = plugins_head; NULL != pos; pos = pos->next)
342 if (pos->short_name == strstr (pos->short_name, stripped))
344 GNUNET_free (stripped);
352 * Convert a given address to a human-readable format. Note that the
353 * return value will be overwritten on the next call to this function.
355 * @param address the address to convert
356 * @return statically allocated (!) human-readable address
359 GST_plugins_a2s (const struct GNUNET_HELLO_Address *address)
361 struct GNUNET_TRANSPORT_PluginFunctions *api;
362 static char unable_to_show[1024];
363 static const char *s;
367 if (0 == address->address_length)
368 return TRANSPORT_SESSION_INBOUND_STRING; /* Addresse with length 0 are inbound, address->address itself may be NULL */
369 api = GST_plugins_printer_find (address->transport_name);
371 return "<plugin unknown>";
372 if (0 == address->address_length)
374 GNUNET_snprintf (unable_to_show, sizeof (unable_to_show),
375 "<unable to stringify %u-byte long address of %s transport>",
376 (unsigned int) address->address_length,
377 address->transport_name);
378 return unable_to_show;
380 return (NULL != (s = api->address_to_string (NULL, address->address,
381 address->address_length)) ? s : "<invalid>");
386 * Register callback with all plugins to monitor their status.
388 * @param cb callback to register, NULL to unsubscribe
389 * @param cb_cls closure for @a cb
392 GST_plugins_monitor_subscribe (GNUNET_TRANSPORT_SessionInfoCallback cb,
395 struct TransportPlugin *pos;
397 for (pos = plugins_head; NULL != pos; pos = pos->next)
398 if (NULL == pos->api->setup_monitor)
401 pos->api->setup_monitor (pos->api->cls,
406 /* end of file gnunet-service-transport_plugins.c */