2 This file is part of GNUnet.
3 (C) 2009, 2010 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 include/gnunet_core_service.h
23 * @brief core service; this is the main API for encrypted P2P
25 * @author Christian Grothoff
28 #ifndef GNUNET_CORE_SERVICE_H
29 #define GNUNET_CORE_SERVICE_H
34 #if 0 /* keep Emacsens' auto-indent happy */
39 #include "gnunet_util_lib.h"
42 * Version number of GNUnet-core API.
44 #define GNUNET_CORE_VERSION 0x00000000
48 * Opaque handle to the service.
50 struct GNUNET_CORE_Handle;
54 * Method called whenever a given peer connects.
57 * @param peer peer identity this notification is about
58 * @param latency reported latency of the connection with 'other'
59 * @param distance reported distance (DV) to 'other'
61 typedef void (*GNUNET_CORE_ConnectEventHandler) (void *cls,
63 GNUNET_PeerIdentity * peer,
64 struct GNUNET_TIME_Relative latency,
68 * Method called whenever a given peer has a status change.
71 * @param peer peer identity this notification is about
72 * @param latency reported latency of the connection with 'other'
73 * @param distance reported distance (DV) to 'other'
74 * @param bandwidth_in available amount of inbound bandwidth
75 * @param bandwidth_out available amount of outbound bandwidth
76 * @param timeout absolute time when this peer will time out
77 * unless we see some further activity from it
79 typedef void (*GNUNET_CORE_PeerStatusEventHandler) (void *cls,
81 GNUNET_PeerIdentity * peer,
82 struct GNUNET_TIME_Relative latency,
84 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
85 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
86 struct GNUNET_TIME_Absolute timeout);
90 * Method called whenever a peer disconnects.
93 * @param peer peer identity this notification is about
95 typedef void (*GNUNET_CORE_DisconnectEventHandler) (void *cls,
97 GNUNET_PeerIdentity * peer);
101 * Functions with this signature are called whenever a message is
102 * received or transmitted.
105 * @param peer the other peer involved (sender or receiver, NULL
106 * for loopback messages where we are both sender and receiver)
107 * @param message the actual message
108 * @param latency reported latency of the connection with 'other'
109 * @param distance reported distance (DV) to 'other'
110 * @return GNUNET_OK to keep the connection open,
111 * GNUNET_SYSERR to close it (signal serious error)
114 (*GNUNET_CORE_MessageCallback) (void *cls,
115 const struct GNUNET_PeerIdentity * other,
116 const struct GNUNET_MessageHeader *
118 struct GNUNET_TIME_Relative latency,
123 * Message handler. Each struct specifies how to handle on particular
124 * type of message received.
126 struct GNUNET_CORE_MessageHandler
129 * Function to call for messages of "type".
131 GNUNET_CORE_MessageCallback callback;
134 * Type of the message this handler covers.
139 * Expected size of messages of this type. Use 0 for variable-size.
140 * If non-zero, messages of the given type will be discarded if they
141 * do not have the right size.
143 uint16_t expected_size;
149 * Function called after GNUNET_CORE_connect has succeeded
150 * (or failed for good). Note that the private key of the
151 * peer is intentionally not exposed here; if you need it,
152 * your process should try to read the private key file
153 * directly (which should work if you are authorized...).
156 * @param server handle to the server, NULL if we failed
157 * @param my_identity ID of this peer, NULL if we failed
158 * @param publicKey public key of this peer, NULL if we failed
161 (*GNUNET_CORE_StartupCallback) (void *cls,
162 struct GNUNET_CORE_Handle * server,
163 const struct GNUNET_PeerIdentity *
166 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *
171 * Connect to the core service. Note that the connection may complete
172 * (or fail) asynchronously. This function primarily causes the given
173 * callback notification functions to be invoked whenever the
174 * specified event happens. The maximum number of queued
175 * notifications (queue length) is per client but the queue is shared
176 * across all types of notifications. So a slow client that registers
177 * for 'outbound_notify' also risks missing 'inbound_notify' messages.
178 * Certain events (such as connect/disconnect notifications) are not
179 * subject to queue size limitations.
181 * @param sched scheduler to use
182 * @param cfg configuration to use
183 * @param timeout after how long should we give up trying to connect to the core service?
184 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
185 * @param init callback to call on timeout or once we have successfully
186 * connected to the core service; note that timeout is only meaningful if init is not NULL
187 * @param connects function to call on peer connect, can be NULL
188 * @param disconnects function to call on peer disconnect / timeout, can be NULL
189 * @param status_events function to call on peer status changes, can be NULL
190 * @param inbound_notify function to call for all inbound messages, can be NULL
191 * note that the core is allowed to drop notifications about inbound
192 * messages if the client does not process them fast enough (for this
193 * notification type, a bounded queue is used)
194 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
195 * GNUNET_MessageHeader and hence we do not need to give it the full message;
196 * can be used to improve efficiency, ignored if inbound_notify is NULL
197 * note that the core is allowed to drop notifications about inbound
198 * messages if the client does not process them fast enough (for this
199 * notification type, a bounded queue is used)
200 * @param outbound_notify function to call for all outbound messages, can be NULL;
201 * note that the core is allowed to drop notifications about outbound
202 * messages if the client does not process them fast enough (for this
203 * notification type, a bounded queue is used)
204 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
205 * GNUNET_MessageHeader and hence we do not need to give it the full message
206 * can be used to improve efficiency, ignored if outbound_notify is NULL
207 * note that the core is allowed to drop notifications about outbound
208 * messages if the client does not process them fast enough (for this
209 * notification type, a bounded queue is used)
210 * @param handlers callbacks for messages we care about, NULL-terminated
211 * note that the core is allowed to drop notifications about inbound
212 * messages if the client does not process them fast enough (for this
213 * notification type, a bounded queue is used)
214 * @return handle to the core service (only useful for disconnect until 'init' is called),
215 * NULL on error (in this case, init is never called)
217 struct GNUNET_CORE_Handle *
218 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
219 const struct GNUNET_CONFIGURATION_Handle *cfg,
220 struct GNUNET_TIME_Relative timeout,
222 GNUNET_CORE_StartupCallback init,
223 GNUNET_CORE_ConnectEventHandler connects,
224 GNUNET_CORE_DisconnectEventHandler disconnects,
225 GNUNET_CORE_PeerStatusEventHandler status_events,
226 GNUNET_CORE_MessageCallback inbound_notify,
227 int inbound_hdr_only,
228 GNUNET_CORE_MessageCallback outbound_notify,
229 int outbound_hdr_only,
230 const struct GNUNET_CORE_MessageHandler *handlers);
234 * Disconnect from the core service.
236 * @param handle connection to core to disconnect
238 void GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle);
242 * Handle for a request to the core to connect or disconnect
243 * from a particular peer. Can be used to cancel the request
244 * (before the 'cont'inuation is called).
246 struct GNUNET_CORE_PeerRequestHandle;
250 * Request that the core should try to connect to a particular peer.
251 * Once the request has been transmitted to the core, the continuation
252 * function will be called. Note that this does NOT mean that a
253 * connection was successfully established -- it only means that the
254 * core will now try. Successful establishment of the connection
255 * will be signalled to the 'connects' callback argument of
256 * 'GNUNET_CORE_connect' only. If the core service does not respond
257 * to our connection attempt within the given time frame, 'cont' will
258 * be called with the TIMEOUT reason code.
260 * @param sched scheduler to use
261 * @param cfg configuration to use
262 * @param timeout how long to try to talk to core
263 * @param peer who should we connect to
264 * @param cont function to call once the request has been completed (or timed out)
265 * @param cont_cls closure for cont
266 * @return NULL on error (cont will not be called), otherwise handle for cancellation
268 struct GNUNET_CORE_PeerRequestHandle *
269 GNUNET_CORE_peer_request_connect (struct GNUNET_SCHEDULER_Handle *sched,
270 const struct GNUNET_CONFIGURATION_Handle *cfg,
271 struct GNUNET_TIME_Relative timeout,
272 const struct GNUNET_PeerIdentity * peer,
273 GNUNET_SCHEDULER_Task cont,
278 * Cancel a pending request to connect to a particular peer. Must not
279 * be called after the 'cont' function was invoked.
281 * @param req request handle that was returned for the original request
284 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req);
288 * Function called with statistics about the given peer.
291 * @param peer identifies the peer
292 * @param bpm_in set to the current bandwidth limit (receiving) for this peer
293 * @param bpm_out set to the current bandwidth limit (sending) for this peer
294 * @param latency current latency estimate, "FOREVER" if we have been
296 * @param amount set to the amount that was actually reserved or unreserved;
297 * either the full requested amount or zero (no partial reservations)
298 * @param preference current traffic preference for the given peer
301 (*GNUNET_CORE_PeerConfigurationInfoCallback) (void *cls,
303 GNUNET_PeerIdentity * peer,
304 struct GNUNET_BANDWIDTH_Value32NBO bpm_in,
305 struct GNUNET_BANDWIDTH_Value32NBO bpm_out,
307 uint64_t preference);
312 * Context that can be used to cancel a peer information request.
314 struct GNUNET_CORE_InformationRequestContext;
318 * Obtain statistics and/or change preferences for the given peer.
320 * @param sched scheduler to use
321 * @param cfg configuration to use
322 * @param peer identifies the peer
323 * @param timeout after how long should we give up (and call "info" with NULL
324 * for "peer" to signal an error)?
325 * @param bw_out set to the current bandwidth limit (sending) for this peer,
326 * caller should set "bpm_out" to "-1" to avoid changing
327 * the current value; otherwise "bw_out" will be lowered to
328 * the specified value; passing a pointer to "0" can be used to force
329 * us to disconnect from the peer; "bw_out" might not increase
330 * as specified since the upper bound is generally
331 * determined by the other peer!
332 * @param amount reserve N bytes for receiving, negative
333 * amounts can be used to undo a (recent) reservation;
334 * @param preference increase incoming traffic share preference by this amount;
335 * in the absence of "amount" reservations, we use this
336 * preference value to assign proportional bandwidth shares
337 * to all connected peers
338 * @param info function to call with the resulting configuration information
339 * @param info_cls closure for info
340 * @return NULL on error
342 struct GNUNET_CORE_InformationRequestContext *
343 GNUNET_CORE_peer_change_preference (struct GNUNET_SCHEDULER_Handle *sched,
344 const struct GNUNET_CONFIGURATION_Handle *cfg,
345 const struct GNUNET_PeerIdentity *peer,
346 struct GNUNET_TIME_Relative timeout,
347 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
350 GNUNET_CORE_PeerConfigurationInfoCallback info,
355 * Cancel request for getting information about a peer.
357 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
360 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc);
363 * Obtain statistics and/or change preferences for the given peer.
365 * @param sched scheduler to use
366 * @param cfg configuration to use
367 * @param peer_cb function to call with the peer information
368 * @param cb_cls closure for peer_cb
369 * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
372 GNUNET_CORE_iterate_peers (struct GNUNET_SCHEDULER_Handle *sched,
373 const struct GNUNET_CONFIGURATION_Handle *cfg,
374 GNUNET_CORE_ConnectEventHandler peer_cb,
378 * Handle for a transmission request.
380 struct GNUNET_CORE_TransmitHandle;
384 * Ask the core to call "notify" once it is ready to transmit the
385 * given number of bytes to the specified "target". If we are not yet
386 * connected to the specified peer, a call to this function will cause
387 * us to try to establish a connection.
389 * @param handle connection to core service
390 * @param priority how important is the message?
391 * @param maxdelay how long can the message wait?
392 * @param target who should receive the message,
393 * use NULL for this peer (loopback)
394 * @param notify_size how many bytes of buffer space does notify want?
395 * @param notify function to call when buffer space is available
396 * @param notify_cls closure for notify
397 * @return non-NULL if the notify callback was queued,
398 * NULL if we can not even queue the request (insufficient
399 * memory); if NULL is returned, "notify" will NOT be called.
401 struct GNUNET_CORE_TransmitHandle *
402 GNUNET_CORE_notify_transmit_ready (struct
415 GNUNET_CONNECTION_TransmitReadyNotify
422 * Cancel the specified transmission-ready notification.
424 * @param th handle that was returned by "notify_transmit_ready".
427 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
431 #if 0 /* keep Emacsens' auto-indent happy */
438 /* ifndef GNUNET_CORE_SERVICE_H */
440 /* end of gnunet_core_service.h */