2 This file is part of GNUnet.
3 (C) 2009 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 2, 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"
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
59 * @param bpm how much bandwidth is available
60 * (for sending) to this peer
61 * @param last_activity when did we last
62 * receive anything from this peer?
64 typedef void (*GNUNET_CORE_ClientEventHandler) (void *cls,
66 GNUNET_PeerIdentity * peer,
68 struct GNUNET_TIME_Absolute
73 * Type of a send callback to fill up buffers.
75 * @param receiver the receiver of the message
76 * @param position is the reference to the
77 * first unused position in the buffer where GNUnet is building
79 * @param padding is the number of bytes left in that buffer.
80 * @return the number of bytes written to
81 * that buffer (must be a positive number).
84 (*GNUNET_CORE_BufferFillCallback) (void *cls,
85 const struct GNUNET_PeerIdentity *
87 void *position, unsigned int padding);
91 * Functions with this signature are called whenever a message is
92 * received or transmitted.
95 * @param peer the other peer involved (sender or receiver, NULL
96 * for loopback messages where we are both sender and receiver)
97 * @param message the actual message
98 * @return GNUNET_OK to keep the connection open,
99 * GNUNET_SYSERR to close it (signal serious error)
102 (*GNUNET_CORE_MessageCallback) (void *cls,
103 const struct GNUNET_PeerIdentity * other,
104 const struct GNUNET_MessageHeader *
109 * Message handler. Each struct specifies how to handle on particular
110 * type of message received.
112 struct GNUNET_CORE_MessageHandler
115 * Function to call for messages of "type".
117 GNUNET_CORE_MessageCallback callback;
120 * Type of the message this handler covers.
125 * Expected size of messages of this type. Use 0 for variable-size.
126 * If non-zero, messages of the given type will be discarded if they
127 * do not have the right size.
129 uint16_t expected_size;
135 * Function called after GNUNET_CORE_connect has succeeded
136 * (or failed for good). Note that the private key of the
137 * peer is intentionally not exposed here; if you need it,
138 * your process should try to read the private key file
139 * directly (which should work if you are authorized...).
142 * @param server handle to the server, NULL if we failed
143 * @param my_identity ID of this peer, NULL if we failed
144 * @param publicKey public key of this peer, NULL if we failed
147 (*GNUNET_CORE_StartupCallback) (void *cls,
148 struct GNUNET_CORE_Handle * server,
149 const struct GNUNET_PeerIdentity *
152 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *
157 * Connect to the core service. Note that the connection may
158 * complete (or fail) asynchronously.
160 * @param sched scheduler to use
161 * @param cfg configuration to use
162 * @param timeout after how long should we give up trying to connect to the core service?
163 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
164 * @param init callback to call on timeout or once we have successfully
165 * connected to the core service
166 * @param connects function to call on peer connect, can be NULL
167 * @param disconnects function to call on peer disconnect / timeout, can be NULL
168 * @param bfc function to call to fill up spare bandwidth, can be NULL
169 * @param inbound_notify function to call for all inbound messages, can be NULL
170 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
171 * GNUNET_MessageHeader and hence we do not need to give it the full message;
172 * can be used to improve efficiency, ignored if inbound_notify is NULLL
173 * @param outbound_notify function to call for all outbound messages, can be NULL
174 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
175 * GNUNET_MessageHeader and hence we do not need to give it the full message
176 * can be used to improve efficiency, ignored if outbound_notify is NULLL
177 * @param handlers callbacks for messages we care about, NULL-terminated
180 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
181 struct GNUNET_CONFIGURATION_Handle *cfg,
182 struct GNUNET_TIME_Relative timeout,
184 GNUNET_CORE_StartupCallback init,
185 GNUNET_CORE_ClientEventHandler connects,
186 GNUNET_CORE_ClientEventHandler disconnects,
187 GNUNET_CORE_BufferFillCallback bfc,
188 GNUNET_CORE_MessageCallback inbound_notify,
189 int inbound_hdr_only,
190 GNUNET_CORE_MessageCallback outbound_notify,
191 int outbound_hdr_only,
192 const struct GNUNET_CORE_MessageHandler *handlers);
196 * Disconnect from the core service.
198 * @param handle connection to core to disconnect
200 void GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle);
204 * Function called with statistics about the given peer.
206 * @param peer identifies the peer
207 * @param latency current latency estimate, "FOREVER" if we have been
209 * @param bpm_in set to the current bandwidth limit (receiving) for this peer
210 * @param bpm_out set to the current bandwidth limit (sending) for this peer
211 * @param amount set to the amount that was actually reserved or unreserved
212 * @param preference current traffic preference for the given peer
215 (*GNUNET_CORE_PeerConfigurationInfoCallback) (void *cls,
217 GNUNET_PeerIdentity * peer,
219 unsigned int bpm_out,
220 struct GNUNET_TIME_Relative
226 * Obtain statistics and/or change preferences for the given peer.
228 * @param handle connection to core to use
229 * @param peer identifies the peer
230 * @param timeout after how long should we give up (and call "info" with NULL
231 * for "peer" to signal an error)?
232 * @param bpm_out set to the current bandwidth limit (sending) for this peer,
233 * caller should set "bpm_out" to "-1" to avoid changing
234 * the current value; otherwise "bpm_out" will be lowered to
235 * the specified value; passing a pointer to "0" can be used to force
236 * us to disconnect from the peer; "bpm_out" might not increase
237 * as specified since the upper bound is generally
238 * determined by the other peer!
239 * @param amount reserve N bytes for receiving, negative
240 * amounts can be used to undo a (recent) reservation;
241 * @param preference increase incoming traffic share preference by this amount;
242 * in the absence of "amount" reservations, we use this
243 * preference value to assign proportional bandwidth shares
244 * to all connected peers
245 * @param info function to call with the resulting configuration information
246 * @param info_cls closure for info
249 GNUNET_CORE_peer_configure (struct GNUNET_CORE_Handle *handle,
250 const struct GNUNET_PeerIdentity *peer,
251 struct GNUNET_TIME_Relative timeout,
252 unsigned int bpm_out,
255 GNUNET_CORE_PeerConfigurationInfoCallback info,
260 * Handle for a transmission request.
262 struct GNUNET_CORE_TransmitHandle;
266 * Ask the core to call "notify" once it is ready to transmit the
267 * given number of bytes to the specified "target". If we are not yet
268 * connected to the specified peer, a call to this function will cause
269 * us to try to establish a connection.
271 * @param handle connection to core service
272 * @param priority how important is the message?
273 * @param maxdelay how long can the message wait?
274 * @param target who should receive the message,
275 * use NULL for this peer (loopback)
276 * @param notify_size how many bytes of buffer space does notify want?
277 * @param notify function to call when buffer space is available
278 * @param notify_cls closure for notify
279 * @return non-NULL if the notify callback was queued,
280 * NULL if we can not even queue the request (insufficient
281 * memory); if NULL is returned, "notify" will NOT be called.
283 struct GNUNET_CORE_TransmitHandle *GNUNET_CORE_notify_transmit_ready (struct
298 GNUNET_NETWORK_TransmitReadyNotify
305 * Cancel the specified transmission-ready notification.
307 * @param h handle that was returned by "notify_transmit_ready".
310 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
314 #if 0 /* keep Emacsens' auto-indent happy */
321 /* ifndef GNUNET_CORE_SERVICE_H */
323 /* end of gnunet_core_service.h */