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
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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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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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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"
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
60 * @param atsi_count number of records in 'atsi'
62 typedef void (*GNUNET_CORE_ConnectEventHandler) (void *cls,
64 GNUNET_PeerIdentity * peer,
66 GNUNET_ATS_Information
68 unsigned int atsi_count);
72 * Method called whenever a peer disconnects.
75 * @param peer peer identity this notification is about
77 typedef void (*GNUNET_CORE_DisconnectEventHandler) (void *cls,
79 GNUNET_PeerIdentity * peer);
83 * Functions with this signature are called whenever a message is
84 * received or transmitted.
86 * @param cls closure (set from GNUNET_CORE_connect)
87 * @param peer the other peer involved (sender or receiver, NULL
88 * for loopback messages where we are both sender and receiver)
89 * @param message the actual message
90 * @param atsi performance data for the connection
91 * @param atsi_count number of records in 'atsi'
92 * @return GNUNET_OK to keep the connection open,
93 * GNUNET_SYSERR to close it (signal serious error)
95 typedef int (*GNUNET_CORE_MessageCallback) (void *cls,
96 const struct GNUNET_PeerIdentity *
98 const struct GNUNET_MessageHeader *
101 GNUNET_ATS_Information *
103 unsigned int atsi_count);
107 * Message handler. Each struct specifies how to handle on particular
108 * type of message received.
110 struct GNUNET_CORE_MessageHandler
113 * Function to call for messages of "type".
115 GNUNET_CORE_MessageCallback callback;
118 * Type of the message this handler covers.
123 * Expected size of messages of this type. Use 0 for variable-size.
124 * If non-zero, messages of the given type will be discarded if they
125 * do not have the right size.
127 uint16_t expected_size;
133 * Function called after GNUNET_CORE_connect has succeeded (or failed
134 * for good). Note that the private key of the peer is intentionally
135 * not exposed here; if you need it, your process should try to read
136 * the private key file directly (which should work if you are
140 * @param server handle to the server, NULL if we failed
141 * @param my_identity ID of this peer, NULL if we failed
143 typedef void (*GNUNET_CORE_StartupCallback) (void *cls,
144 struct GNUNET_CORE_Handle * server,
145 const struct GNUNET_PeerIdentity *my_identity);
149 * Connect to the core service. Note that the connection may complete
150 * (or fail) asynchronously. This function primarily causes the given
151 * callback notification functions to be invoked whenever the
152 * specified event happens. The maximum number of queued
153 * notifications (queue length) is per client but the queue is shared
154 * across all types of notifications. So a slow client that registers
155 * for 'outbound_notify' also risks missing 'inbound_notify' messages.
156 * Certain events (such as connect/disconnect notifications) are not
157 * subject to queue size limitations.
159 * @param cfg configuration to use
160 * @param queue_size size of the per-peer message queue
161 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
162 * @param init callback to call on timeout or once we have successfully
163 * connected to the core service; note that timeout is only meaningful if init is not NULL
164 * @param connects function to call on peer connect, can be NULL
165 * @param disconnects function to call on peer disconnect / timeout, can be NULL
166 * @param inbound_notify function to call for all inbound messages, can be NULL
167 * note that the core is allowed to drop notifications about inbound
168 * messages if the client does not process them fast enough (for this
169 * notification type, a bounded queue is used)
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 NULL
173 * note that the core is allowed to drop notifications about inbound
174 * messages if the client does not process them fast enough (for this
175 * notification type, a bounded queue is used)
176 * @param outbound_notify function to call for all outbound messages, can be NULL;
177 * note that the core is allowed to drop notifications about outbound
178 * messages if the client does not process them fast enough (for this
179 * notification type, a bounded queue is used)
180 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
181 * GNUNET_MessageHeader and hence we do not need to give it the full message
182 * can be used to improve efficiency, ignored if outbound_notify is NULL
183 * note that the core is allowed to drop notifications about outbound
184 * messages if the client does not process them fast enough (for this
185 * notification type, a bounded queue is used)
186 * @param handlers callbacks for messages we care about, NULL-terminated
187 * note that the core is allowed to drop notifications about inbound
188 * messages if the client does not process them fast enough (for this
189 * notification type, a bounded queue is used)
190 * @return handle to the core service (only useful for disconnect until 'init' is called),
191 * NULL on error (in this case, init is never called)
193 struct GNUNET_CORE_Handle *
194 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
195 unsigned int queue_size, void *cls,
196 GNUNET_CORE_StartupCallback init,
197 GNUNET_CORE_ConnectEventHandler connects,
198 GNUNET_CORE_DisconnectEventHandler disconnects,
199 GNUNET_CORE_MessageCallback inbound_notify,
200 int inbound_hdr_only,
201 GNUNET_CORE_MessageCallback outbound_notify,
202 int outbound_hdr_only,
203 const struct GNUNET_CORE_MessageHandler *handlers);
207 * Disconnect from the core service. This function can only
208 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
209 * requests have been explicitly cancelled.
211 * @param handle connection to core to disconnect
214 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle);
218 * Handle for a transmission request.
220 struct GNUNET_CORE_TransmitHandle;
224 * Ask the core to call "notify" once it is ready to transmit the
225 * given number of bytes to the specified "target". Must only be
226 * called after a connection to the respective peer has been
227 * established (and the client has been informed about this).
230 * @param handle connection to core service
231 * @param cork is corking allowed for this transmission?
232 * @param priority how important is the message?
233 * @param maxdelay how long can the message wait?
234 * @param target who should receive the message,
235 * use NULL for this peer (loopback)
236 * @param notify_size how many bytes of buffer space does notify want?
237 * @param notify function to call when buffer space is available;
238 * will be called with NULL on timeout or if the overall queue
239 * for this peer is larger than queue_size and this is currently
240 * the message with the lowest priority; will also be called
241 * with 'NULL' buf if the peer disconnects; since the disconnect
242 * signal will be emmitted even later, clients MUST cancel
243 * all pending transmission requests DURING the disconnect
244 * handler (unless they ensure that 'notify' never calls
245 * 'GNUNET_CORE_notify_transmit_ready').
246 * @param notify_cls closure for notify
247 * @return non-NULL if the notify callback was queued,
248 * NULL if we can not even queue the request (insufficient
249 * memory); if NULL is returned, "notify" will NOT be called.
251 struct GNUNET_CORE_TransmitHandle *
252 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle, int cork,
254 struct GNUNET_TIME_Relative maxdelay,
255 const struct GNUNET_PeerIdentity *target,
257 GNUNET_CONNECTION_TransmitReadyNotify notify,
262 * Cancel the specified transmission-ready notification.
264 * @param th handle that was returned by "notify_transmit_ready".
267 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
275 * Iterate over all connected peers. Calls peer_cb with each
276 * connected peer, and then once with NULL to indicate that all peers
277 * have been handled. Normal users of the CORE API are not expected
278 * to use this function. It is different in that it truly lists
279 * all connections, not just those relevant to the application. This
280 * function is used by special applications for diagnostics. This
281 * function is NOT part of the 'versioned', 'official' API.
283 * FIXME: we should probably make it possible to 'cancel' the
286 * @param cfg configuration handle
287 * @param peer_cb function to call with the peer information
288 * @param cb_cls closure for peer_cb
289 * @return GNUNET_OK on success, GNUNET_SYSERR on errors
292 GNUNET_CORE_iterate_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
293 GNUNET_CORE_ConnectEventHandler peer_cb,
298 * Check if the given peer is currently connected and return information
299 * about the session if so. This function is for special cirumstances
300 * (GNUNET_TESTING uses it), normal users of the CORE API are
301 * expected to track which peers are connected based on the
302 * connect/disconnect callbacks from GNUNET_CORE_connect. This
303 * function is NOT part of the 'versioned', 'official' API.
305 * FIXME: we should probably make it possible to 'cancel' the
308 * @param cfg configuration to use
309 * @param peer the specific peer to check for
310 * @param peer_cb function to call with the peer information
311 * @param cb_cls closure for peer_cb
312 * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
315 GNUNET_CORE_is_peer_connected (const struct GNUNET_CONFIGURATION_Handle *cfg,
316 struct GNUNET_PeerIdentity *peer,
317 GNUNET_CORE_ConnectEventHandler peer_cb,
321 #if 0 /* keep Emacsens' auto-indent happy */
328 /* ifndef GNUNET_CORE_SERVICE_H */
330 /* end of gnunet_core_service.h */