2 This file is part of GNUnet
3 (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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13 General Public License for more details.
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22 * @file transport/plugin_transport_dv.c
23 * @brief DV transport service, takes incoming DV requests and deals with
25 * @author Christian Grothoff
31 * As a start, the dv plugin needs to listen for information from the dv
32 * service. The plugin (?) will be notified by core (?) when a tcp/udp/whatever
33 * message comes in that should be for dv. The plugin will then hand off the message
34 * to the dv service which will decrypt/validate the message (?) and then send the
35 * result back to us (the transport) which will then send the message to the transport
38 * Or, core will notify the dv service directly which will validate,
39 * etc. and then just send a message to us.
41 * For starters, this plugin needs to have a client which will listen for messages from
42 * the dv service that need to be sent up to the gnunet-transport-service.
44 * Messages sent from the dv transport get passed to the dv service which deals
45 * with the actual sending (how much state does this transport need? should it know
46 * which peers it is currently connected to and their distances, or just assume that
47 * anything should be passed along to the dv service?).
50 #include "gnunet_protocols.h"
51 #include "gnunet_connection_lib.h"
52 #include "gnunet_server_lib.h"
53 #include "gnunet_service_lib.h"
54 #include "gnunet_statistics_service.h"
55 #include "gnunet_dv_service.h"
56 #include "gnunet_transport_service.h"
57 #include "../transport/plugin_transport.h"
60 #define DEBUG_TEMPLATE GNUNET_NO
63 * Encapsulation of all of the state of the plugin.
69 * Session handle for connections.
75 * Stored in a linked list.
80 * Pointer to the global plugin struct.
82 struct Plugin *plugin;
85 * The client (used to identify this connection)
90 * Continuation function to call once the transmission buffer
91 * has again space available. NULL if there is no
92 * continuation to call.
94 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
97 * Closure for transmit_cont.
99 void *transmit_cont_cls;
102 * To whom are we talking to (set to our identity
103 * if we are still waiting for the welcome message)
105 struct GNUNET_PeerIdentity sender;
108 * At what time did we reset last_received last?
110 struct GNUNET_TIME_Absolute last_quota_update;
113 * How many bytes have we received since the "last_quota_update"
116 uint64_t last_received;
119 * Number of bytes per ms that this peer is allowed
127 * Encapsulation of all of the state of the plugin.
134 struct GNUNET_TRANSPORT_PluginEnvironment *env;
137 * List of open sessions.
139 struct Session *sessions;
142 * Handle for the statistics service.
144 struct GNUNET_STATISTICS_Handle *statistics;
149 //struct GNUNET_SERVER_Handle *server;
152 * Handle to the running service.
154 //struct GNUNET_SERVICE_Context *service;
157 * Copy of the handler array where the closures are
158 * set to this struct's instance.
160 struct GNUNET_SERVER_MessageHandler *handlers;
163 * Handle to the DV service
165 struct GNUNET_DV_Handle *dv_handle;
170 void handle_dv_message_received (void *cls,
171 struct GNUNET_PeerIdentity *sender,
172 struct GNUNET_MessageHeader *msg,
173 unsigned int distance,
174 char *sender_address,
175 size_t sender_address_len)
177 struct Plugin *plugin = cls;
179 plugin->env->receive(plugin,
189 /* Question: how does the transport service learn of a newly connected (gossipped about)
190 * DV peer? Should the plugin (here) create a HELLO for that peer and send it along,
191 * or should the DV service create a HELLO and send it to us via the other part?
195 * Function that can be used by the transport service to transmit
196 * a message using the plugin.
199 * @param target who should receive this message
200 * @param priority how important is the message
201 * @param msgbuf the message to transmit
202 * @param msgbuf_size number of bytes in 'msgbuf'
203 * @param timeout when should we time out
204 * @param addr the address to use (can be NULL if the plugin
205 * is "on its own" (i.e. re-use existing TCP connection))
206 * @param addrlen length of the address in bytes
207 * @param force_address GNUNET_YES if the plugin MUST use the given address,
208 * otherwise the plugin may use other addresses or
209 * existing connections (if available)
210 * @param cont continuation to call once the message has
211 * been transmitted (or if the transport is ready
212 * for the next transmission call; or if the
213 * peer disconnected...)
214 * @param cont_cls closure for cont
215 * @return number of bytes used (on the physical network, with overheads);
216 * -1 on hard errors (i.e. address invalid); 0 is a legal value
217 * and does NOT mean that the message was not transmitted (DV)
220 dv_plugin_send (void *cls,
221 const struct GNUNET_PeerIdentity *target,
224 unsigned int priority,
225 struct GNUNET_TIME_Relative timeout,
229 GNUNET_TRANSPORT_TransmitContinuation
230 cont, void *cont_cls)
233 struct Plugin *plugin = cls;
235 /* FIXME: do we want the dv plugin to remember sent messages to call continuation once message actually goes out?
236 * Or do we just call the continuation once we've notified the plugin?
238 ret = GNUNET_DV_send(plugin->dv_handle,
246 /*, cont, cont_cls);*/
249 cont(cls, target, GNUNET_OK);
251 cont(cls, target, GNUNET_SYSERR);
259 * Function that can be used to force the plugin to disconnect
260 * from the given peer and cancel all previous transmissions
261 * (and their continuations).
264 * @param target peer from which to disconnect
267 dv_plugin_disconnect (void *cls,
268 const struct GNUNET_PeerIdentity *target)
270 // struct Plugin *plugin = cls;
271 // TODO: Add message type to send to dv service to "disconnect" a peer
276 * Convert the transports address to a nice, human-readable
280 * @param type name of the transport that generated the address
281 * @param addr one of the addresses of the host, NULL for the last address
282 * the specific address format depends on the transport
283 * @param addrlen length of the address
284 * @param numeric should (IP) addresses be displayed in numeric form?
285 * @param timeout after how long should we give up?
286 * @param asc function to call on each string
287 * @param asc_cls closure for asc
290 dv_plugin_address_pretty_printer (void *cls,
295 struct GNUNET_TIME_Relative timeout,
296 GNUNET_TRANSPORT_AddressStringCallback
305 * Another peer has suggested an address for this
306 * peer and transport plugin. Check that this could be a valid
307 * address. If so, consider adding it to the list
311 * @param addr pointer to the address
312 * @param addrlen length of addr
313 * @return GNUNET_OK if this is a plausible address for this peer
316 * FIXME: does this mean anything for the DV plugin?
319 dv_plugin_address_suggested (void *cls,
320 void *addr, size_t addrlen)
322 /* struct Plugin *plugin = cls; */
324 /* check if the address is plausible; if so,
325 add it to our list! */
331 * Entry point for the plugin.
334 libgnunet_plugin_transport_dv_init (void *cls)
336 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
337 struct GNUNET_TRANSPORT_PluginFunctions *api;
338 struct Plugin *plugin;
339 struct GNUNET_SERVICE_Context *service;
342 * Do we not even need a service for this thing? That's peculiar.
345 service = GNUNET_SERVICE_start ("transport-dv", env->sched, env->cfg);
348 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
351 ("Failed to start service for `%s' transport plugin.\n"),
357 * I don't think we need a port, the only way we get stuff is being directly
358 * called by service transport or by responses from the dv-service via our
363 GNUNET_CONFIGURATION_get_value_number (env->cfg,
368 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
371 ("Require valid port number for service `%s' in configuration!\n"),
373 GNUNET_SERVICE_stop (service);
378 plugin = GNUNET_malloc (sizeof (struct Plugin));
380 plugin->statistics = NULL;
381 //plugin->service = service;
382 //plugin->server = GNUNET_SERVICE_get_server (service);
384 plugin->dv_handle = GNUNET_DV_connect(env->sched, env->cfg, &handle_dv_message_received, plugin);
386 if (plugin->dv_handle == NULL)
392 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
394 api->send = &dv_plugin_send;
395 api->disconnect = &dv_plugin_disconnect;
396 api->address_pretty_printer = &dv_plugin_address_pretty_printer;
397 api->check_address = &dv_plugin_address_suggested;
403 * Exit point from the plugin.
406 libgnunet_plugin_transport_dv_done (void *cls)
408 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
409 struct Plugin *plugin = api->cls;
411 GNUNET_free (plugin);
416 /* end of plugin_transport_template.c */