2 This file is part of GNUnet.
3 (C) 2009, 2010 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.
10 GNUnet is distributed in the hope that it will be useful, but
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 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"
40 #include "gnunet_transport_service.h"
43 * Version number of GNUnet-core API.
45 #define GNUNET_CORE_VERSION 0x00000000
49 * Opaque handle to the service.
51 struct GNUNET_CORE_Handle;
55 * Method called whenever a given peer connects.
58 * @param peer peer identity this notification is about
59 * @param atsi performance data for the connection
61 typedef void (*GNUNET_CORE_ConnectEventHandler) (void *cls,
63 GNUNET_PeerIdentity * peer,
65 GNUNET_TRANSPORT_ATS_Information
70 * Method called whenever a given peer has a status change.
73 * @param peer peer identity this notification is about
74 * @param timeout absolute time when this peer will time out
75 * unless we see some further activity from it
76 * @param bandwidth_in available amount of inbound bandwidth
77 * @param bandwidth_out available amount of outbound bandwidth
78 * @param atsi performance data for the connection
80 typedef void (*GNUNET_CORE_PeerStatusEventHandler) (void *cls,
82 GNUNET_PeerIdentity * peer,
84 GNUNET_BANDWIDTH_Value32NBO
87 GNUNET_BANDWIDTH_Value32NBO
89 struct GNUNET_TIME_Absolute
92 GNUNET_TRANSPORT_ATS_Information
97 * Method called whenever a peer disconnects.
100 * @param peer peer identity this notification is about
102 typedef void (*GNUNET_CORE_DisconnectEventHandler) (void *cls,
104 GNUNET_PeerIdentity * peer);
108 * Functions with this signature are called whenever a message is
109 * received or transmitted.
111 * @param cls closure (set from GNUNET_CORE_connect)
112 * @param peer the other peer involved (sender or receiver, NULL
113 * for loopback messages where we are both sender and receiver)
114 * @param message the actual message
115 * @param atsi performance data for the connection
116 * @return GNUNET_OK to keep the connection open,
117 * GNUNET_SYSERR to close it (signal serious error)
120 (*GNUNET_CORE_MessageCallback) (void *cls,
121 const struct GNUNET_PeerIdentity * other,
122 const struct GNUNET_MessageHeader * message,
124 GNUNET_TRANSPORT_ATS_Information * atsi);
128 * Message handler. Each struct specifies how to handle on particular
129 * type of message received.
131 struct GNUNET_CORE_MessageHandler
134 * Function to call for messages of "type".
136 GNUNET_CORE_MessageCallback callback;
139 * Type of the message this handler covers.
144 * Expected size of messages of this type. Use 0 for variable-size.
145 * If non-zero, messages of the given type will be discarded if they
146 * do not have the right size.
148 uint16_t expected_size;
154 * Function called after GNUNET_CORE_connect has succeeded
155 * (or failed for good). Note that the private key of the
156 * peer is intentionally not exposed here; if you need it,
157 * your process should try to read the private key file
158 * directly (which should work if you are authorized...).
161 * @param server handle to the server, NULL if we failed
162 * @param my_identity ID of this peer, NULL if we failed
163 * @param publicKey public key of this peer, NULL if we failed
166 (*GNUNET_CORE_StartupCallback) (void *cls,
167 struct GNUNET_CORE_Handle * server,
168 const struct GNUNET_PeerIdentity *
171 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *
176 * Connect to the core service. Note that the connection may complete
177 * (or fail) asynchronously. This function primarily causes the given
178 * callback notification functions to be invoked whenever the
179 * specified event happens. The maximum number of queued
180 * notifications (queue length) is per client but the queue is shared
181 * across all types of notifications. So a slow client that registers
182 * for 'outbound_notify' also risks missing 'inbound_notify' messages.
183 * Certain events (such as connect/disconnect notifications) are not
184 * subject to queue size limitations.
186 * @param cfg configuration to use
187 * @param queue_size size of the per-peer message queue
188 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
189 * @param init callback to call on timeout or once we have successfully
190 * connected to the core service; note that timeout is only meaningful if init is not NULL
191 * @param connects function to call on peer connect, can be NULL
192 * @param disconnects function to call on peer disconnect / timeout, can be NULL
193 * @param status_events function to call on peer status changes, can be NULL
194 * @param inbound_notify function to call for all inbound messages, can be NULL
195 * note that the core is allowed to drop notifications about inbound
196 * messages if the client does not process them fast enough (for this
197 * notification type, a bounded queue is used)
198 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
199 * GNUNET_MessageHeader and hence we do not need to give it the full message;
200 * can be used to improve efficiency, ignored if inbound_notify is NULL
201 * note that the core is allowed to drop notifications about inbound
202 * messages if the client does not process them fast enough (for this
203 * notification type, a bounded queue is used)
204 * @param outbound_notify function to call for all outbound messages, can be NULL;
205 * note that the core is allowed to drop notifications about outbound
206 * messages if the client does not process them fast enough (for this
207 * notification type, a bounded queue is used)
208 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
209 * GNUNET_MessageHeader and hence we do not need to give it the full message
210 * can be used to improve efficiency, ignored if outbound_notify is NULL
211 * note that the core is allowed to drop notifications about outbound
212 * messages if the client does not process them fast enough (for this
213 * notification type, a bounded queue is used)
214 * @param handlers callbacks for messages we care about, NULL-terminated
215 * note that the core is allowed to drop notifications about inbound
216 * messages if the client does not process them fast enough (for this
217 * notification type, a bounded queue is used)
218 * @return handle to the core service (only useful for disconnect until 'init' is called),
219 * NULL on error (in this case, init is never called)
221 struct GNUNET_CORE_Handle *GNUNET_CORE_connect (const struct
222 GNUNET_CONFIGURATION_Handle
223 *cfg, unsigned int queue_size,
225 GNUNET_CORE_StartupCallback
227 GNUNET_CORE_ConnectEventHandler
229 GNUNET_CORE_DisconnectEventHandler
231 GNUNET_CORE_PeerStatusEventHandler
233 GNUNET_CORE_MessageCallback
235 int inbound_hdr_only,
236 GNUNET_CORE_MessageCallback
238 int outbound_hdr_only,
240 GNUNET_CORE_MessageHandler
245 * Disconnect from the core service. This function can only
246 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
247 * requests have been explicitly cancelled.
249 * @param handle connection to core to disconnect
251 void GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle);
255 * Handle for a request to the core to connect or disconnect
256 * from a particular peer. Can be used to cancel the request
257 * (before the 'cont'inuation is called).
259 struct GNUNET_CORE_PeerRequestHandle;
263 * Type of function called upon completion.
266 * @param success GNUNET_OK on success (which for request_connect
267 * ONLY means that we transmitted the connect request to CORE,
268 * it does not mean that we are actually now connected!);
269 * GNUNET_NO on timeout,
270 * GNUNET_SYSERR if core was shut down
272 typedef void (*GNUNET_CORE_ControlContinuation) (void *cls, int success);
276 * Request that the core should try to connect to a particular peer.
277 * Once the request has been transmitted to the core, the continuation
278 * function will be called. Note that this does NOT mean that a
279 * connection was successfully established -- it only means that the
280 * core will now try. Successful establishment of the connection
281 * will be signalled to the 'connects' callback argument of
282 * 'GNUNET_CORE_connect' only. If the core service does not respond
283 * to our connection attempt within the given time frame, 'cont' will
284 * be called with the TIMEOUT reason code.
286 * @param h core handle
287 * @param peer who should we connect to
288 * @param cont function to call once the request has been completed (or timed out)
289 * @param cont_cls closure for cont
290 * @return NULL on error (cont will not be called), otherwise handle for cancellation
292 struct GNUNET_CORE_PeerRequestHandle *GNUNET_CORE_peer_request_connect (struct
299 GNUNET_CORE_ControlContinuation
306 * Cancel a pending request to connect to a particular peer. Must not
307 * be called after the 'cont' function was invoked.
309 * @param req request handle that was returned for the original request
312 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle
317 * Function called with perference change information about the given peer.
320 * @param peer identifies the peer
321 * @param bandwidth_out available amount of outbound bandwidth
322 * @param amount set to the amount that was actually reserved or unreserved;
323 * either the full requested amount or zero (no partial reservations)
324 * @param res_delay if the reservation could not be satisfied (amount was 0), how
325 * long should the client wait until re-trying?
326 * @param preference current traffic preference for the given peer
329 (*GNUNET_CORE_PeerConfigurationInfoCallback) (void *cls,
331 GNUNET_PeerIdentity * peer,
333 GNUNET_BANDWIDTH_Value32NBO
334 bandwidth_out, int32_t amount,
335 struct GNUNET_TIME_Relative
337 uint64_t preference);
342 * Context that can be used to cancel a peer information request.
344 struct GNUNET_CORE_InformationRequestContext;
348 * Obtain statistics and/or change preferences for the given peer.
349 * You can only have one such pending request per peer.
351 * @param h core handle
352 * @param peer identifies the peer
353 * @param timeout after how long should we give up (and call "info" with NULL
354 * for "peer" to signal an error)?
355 * @param bw_out set to the current bandwidth limit (sending) for this peer,
356 * caller should set "bpm_out" to "GNUNET_BANDWIDTH_VALUE_MAX" to avoid changing
357 * the current value; otherwise "bw_out" will be lowered to
358 * the specified value; passing a pointer to "0" can be used to force
359 * us to disconnect from the peer; "bw_out" might not increase
360 * as specified since the upper bound is generally
361 * determined by the other peer!
362 * @param amount reserve N bytes for receiving, negative
363 * amounts can be used to undo a (recent) reservation;
364 * @param preference increase incoming traffic share preference by this amount;
365 * in the absence of "amount" reservations, we use this
366 * preference value to assign proportional bandwidth shares
367 * to all connected peers
368 * @param info function to call with the resulting configuration information
369 * @param info_cls closure for info
370 * @return NULL on error
372 struct GNUNET_CORE_InformationRequestContext
373 *GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
374 const struct GNUNET_PeerIdentity *peer,
375 struct GNUNET_TIME_Relative timeout,
376 struct GNUNET_BANDWIDTH_Value32NBO
377 bw_out, int32_t amount,
379 GNUNET_CORE_PeerConfigurationInfoCallback
380 info, void *info_cls);
384 * Cancel request for getting information about a peer.
385 * Note that an eventual change in preference, trust or bandwidth
386 * assignment MAY have already been committed at the time,
387 * so cancelling a request is NOT sure to undo the original
388 * request. The original request may or may not still commit.
389 * The only thing cancellation ensures is that the callback
390 * from the original request will no longer be called.
392 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
395 GNUNET_CORE_peer_change_preference_cancel (struct
396 GNUNET_CORE_InformationRequestContext
401 * Iterate over all connected peers.
403 * @param cfg configuration handle
404 * @param peer_cb function to call with the peer information
405 * @param cb_cls closure for peer_cb
406 * @return GNUNET_OK on success, GNUNET_SYSERR on errors
409 GNUNET_CORE_iterate_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
410 GNUNET_CORE_ConnectEventHandler peer_cb,
414 * Iterate over all currently connected peers.
415 * Calls peer_cb with each connected peer, and then
416 * once with NULL to indicate that all peers have
419 * @param cfg configuration to use
420 * @param peer the specific peer to check for
421 * @param peer_cb function to call with the peer information
422 * @param cb_cls closure for peer_cb
424 * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
427 GNUNET_CORE_is_peer_connected (const struct GNUNET_CONFIGURATION_Handle *cfg,
428 struct GNUNET_PeerIdentity *peer,
429 GNUNET_CORE_ConnectEventHandler peer_cb,
434 * Handle for a transmission request.
436 struct GNUNET_CORE_TransmitHandle;
440 * Ask the core to call "notify" once it is ready to transmit the
441 * given number of bytes to the specified "target". Must only be
442 * called after a connection to the respective peer has been
443 * established (and the client has been informed about this).
446 * @param handle connection to core service
447 * @param cork is corking allowed for this transmission?
448 * @param priority how important is the message?
449 * @param maxdelay how long can the message wait?
450 * @param target who should receive the message,
451 * use NULL for this peer (loopback)
452 * @param notify_size how many bytes of buffer space does notify want?
453 * @param notify function to call when buffer space is available;
454 * will be called with NULL on timeout or if the overall queue
455 * for this peer is larger than queue_size and this is currently
456 * the message with the lowest priority; will also be called
457 * with 'NULL' buf if the peer disconnects; since the disconnect
458 * signal will be emmitted even later, clients MUST cancel
459 * all pending transmission requests DURING the disconnect
460 * handler (unless they ensure that 'notify' never calls
461 * 'GNUNET_CORE_notify_transmit_ready').
462 * @param notify_cls closure for notify
463 * @return non-NULL if the notify callback was queued,
464 * NULL if we can not even queue the request (insufficient
465 * memory); if NULL is returned, "notify" will NOT be called.
467 struct GNUNET_CORE_TransmitHandle *GNUNET_CORE_notify_transmit_ready (struct
482 GNUNET_CONNECTION_TransmitReadyNotify
489 * Cancel the specified transmission-ready notification.
491 * @param th handle that was returned by "notify_transmit_ready".
494 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
498 #if 0 /* keep Emacsens' auto-indent happy */
505 /* ifndef GNUNET_CORE_SERVICE_H */
507 /* end of gnunet_core_service.h */