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
7 by the Free Software Foundation; either version 2, or (at your
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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.
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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 either connects or
55 * disconnects (or list of connections was requested).
58 * @param peer peer identity this notification is about
60 typedef void (*GNUNET_CORE_ClientEventHandler) (void *cls,
62 GNUNET_PeerIdentity * peer);
66 * Functions with this signature are called whenever a message is
67 * received or transmitted.
70 * @param peer the other peer involved (sender or receiver, NULL
71 * for loopback messages where we are both sender and receiver)
72 * @param message the actual message
73 * @return GNUNET_OK to keep the connection open,
74 * GNUNET_SYSERR to close it (signal serious error)
77 (*GNUNET_CORE_MessageCallback) (void *cls,
78 const struct GNUNET_PeerIdentity * other,
79 const struct GNUNET_MessageHeader *
84 * Message handler. Each struct specifies how to handle on particular
85 * type of message received.
87 struct GNUNET_CORE_MessageHandler
90 * Function to call for messages of "type".
92 GNUNET_CORE_MessageCallback callback;
95 * Type of the message this handler covers.
100 * Expected size of messages of this type. Use 0 for variable-size.
101 * If non-zero, messages of the given type will be discarded if they
102 * do not have the right size.
104 uint16_t expected_size;
110 * Function called after GNUNET_CORE_connect has succeeded
111 * (or failed for good). Note that the private key of the
112 * peer is intentionally not exposed here; if you need it,
113 * your process should try to read the private key file
114 * directly (which should work if you are authorized...).
117 * @param server handle to the server, NULL if we failed
118 * @param my_identity ID of this peer, NULL if we failed
119 * @param publicKey public key of this peer, NULL if we failed
122 (*GNUNET_CORE_StartupCallback) (void *cls,
123 struct GNUNET_CORE_Handle * server,
124 const struct GNUNET_PeerIdentity *
127 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *
132 * Connect to the core service. Note that the connection may
133 * complete (or fail) asynchronously.
135 * @param sched scheduler to use
136 * @param cfg configuration to use
137 * @param timeout after how long should we give up trying to connect to the core service?
138 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
139 * @param init callback to call on timeout or once we have successfully
140 * connected to the core service; note that timeout is only meaningful if init is not NULL
141 * @param connects function to call on peer connect, can be NULL
142 * @param disconnects function to call on peer disconnect / timeout, can be NULL
143 * @param inbound_notify function to call for all inbound messages, can be NULL
144 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
145 * GNUNET_MessageHeader and hence we do not need to give it the full message;
146 * can be used to improve efficiency, ignored if inbound_notify is NULLL
147 * @param outbound_notify function to call for all outbound messages, can be NULL
148 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
149 * GNUNET_MessageHeader and hence we do not need to give it the full message
150 * can be used to improve efficiency, ignored if outbound_notify is NULLL
151 * @param handlers callbacks for messages we care about, NULL-terminated
152 * @return handle to the core service (only useful for disconnect until 'init' is called),
153 * NULL on error (in this case, init is never called)
155 struct GNUNET_CORE_Handle *
156 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
157 const struct GNUNET_CONFIGURATION_Handle *cfg,
158 struct GNUNET_TIME_Relative timeout,
160 GNUNET_CORE_StartupCallback init,
161 GNUNET_CORE_ClientEventHandler connects,
162 GNUNET_CORE_ClientEventHandler disconnects,
163 GNUNET_CORE_MessageCallback inbound_notify,
164 int inbound_hdr_only,
165 GNUNET_CORE_MessageCallback outbound_notify,
166 int outbound_hdr_only,
167 const struct GNUNET_CORE_MessageHandler *handlers);
171 * Disconnect from the core service.
173 * @param handle connection to core to disconnect
175 void GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle);
178 struct GNUNET_CORE_PeerRequestHandle;
180 struct GNUNET_CORE_PeerRequestHandle *
181 struct GNUNET_CORE_peer_request_connect (struct GNUNET_SCHEDULER_Handle *sched,
182 const struct GNUNET_CONFIGURATION_Handle *cfg,
183 const struct GNUNET_PeerIdentity * peer,
184 GNUNET_SCHEDULER_Task cont,
188 struct GNUNET_CORE_PeerRequestHandle *
189 struct GNUNET_CORE_peer_request_disconnect (struct GNUNET_SCHEDULER_Handle *sched,
190 const struct GNUNET_CONFIGURATION_Handle *cfg,
191 const struct GNUNET_PeerIdentity * peer,
192 GNUNET_SCHEDULER_Task cont,
196 GNUNET_CORE_peer_request_cancel (struct GNUNET_CORE_PeerRequestHandle *req);
200 * Function called with statistics about the given peer.
203 * @param peer identifies the peer
204 * @param bpm_in set to the current bandwidth limit (receiving) for this peer
205 * @param bpm_out set to the current bandwidth limit (sending) for this peer
206 * @param latency current latency estimate, "FOREVER" if we have been
208 * @param amount set to the amount that was actually reserved or unreserved
209 * @param preference current traffic preference for the given peer
212 (*GNUNET_CORE_PeerConfigurationInfoCallback) (void *cls,
214 GNUNET_PeerIdentity * peer,
216 unsigned int bpm_out,
217 struct GNUNET_TIME_Relative
219 unsigned long long preference);
224 * Context that can be used to cancel a peer information request.
226 struct GNUNET_CORE_InformationRequestContext;
229 * Obtain statistics and/or change preferences for the given peer.
231 * @param sched scheduler to use
232 * @param cfg configuration to use
233 * @param peer identifies the peer
234 * @param timeout after how long should we give up (and call "info" with NULL
235 * for "peer" to signal an error)?
236 * @param bpm_out set to the current bandwidth limit (sending) for this peer,
237 * caller should set "bpm_out" to "-1" to avoid changing
238 * the current value; otherwise "bpm_out" will be lowered to
239 * the specified value; passing a pointer to "0" can be used to force
240 * us to disconnect from the peer; "bpm_out" might not increase
241 * as specified since the upper bound is generally
242 * determined by the other peer!
243 * @param amount reserve N bytes for receiving, negative
244 * amounts can be used to undo a (recent) reservation;
245 * @param preference increase incoming traffic share preference by this amount;
246 * in the absence of "amount" reservations, we use this
247 * preference value to assign proportional bandwidth shares
248 * to all connected peers
249 * @param info function to call with the resulting configuration information
250 * @param info_cls closure for info
251 * @return NULL on error
253 struct GNUNET_CORE_InformationRequestContext *
254 GNUNET_CORE_peer_get_info (struct GNUNET_SCHEDULER_Handle *sched,
255 const struct GNUNET_CONFIGURATION_Handle *cfg,
256 const struct GNUNET_PeerIdentity *peer,
257 struct GNUNET_TIME_Relative timeout,
261 GNUNET_CORE_PeerConfigurationInfoCallback info,
266 * Cancel request for getting information about a peer.
268 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
271 GNUNET_CORE_peer_get_info_cancel (struct GNUNET_CORE_InformationRequestContext *irc);
275 * Handle for a transmission request.
277 struct GNUNET_CORE_TransmitHandle;
281 * Ask the core to call "notify" once it is ready to transmit the
282 * given number of bytes to the specified "target". If we are not yet
283 * connected to the specified peer, a call to this function will cause
284 * us to try to establish a connection.
286 * @param handle connection to core service
287 * @param priority how important is the message?
288 * @param maxdelay how long can the message wait?
289 * @param target who should receive the message,
290 * use NULL for this peer (loopback)
291 * @param notify_size how many bytes of buffer space does notify want?
292 * @param notify function to call when buffer space is available
293 * @param notify_cls closure for notify
294 * @return non-NULL if the notify callback was queued,
295 * NULL if we can not even queue the request (insufficient
296 * memory); if NULL is returned, "notify" will NOT be called.
298 struct GNUNET_CORE_TransmitHandle *
299 GNUNET_CORE_notify_transmit_ready (struct
314 GNUNET_CONNECTION_TransmitReadyNotify
321 * Cancel the specified transmission-ready notification.
323 * @param h handle that was returned by "notify_transmit_ready".
326 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
330 #if 0 /* keep Emacsens' auto-indent happy */
337 /* ifndef GNUNET_CORE_SERVICE_H */
339 /* end of gnunet_core_service.h */