2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
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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_transport_service.h
23 * @brief low-level P2P IO
24 * @author Christian Grothoff
27 #ifndef GNUNET_TRANSPORT_SERVICE_H
28 #define GNUNET_TRANSPORT_SERVICE_H
33 #if 0 /* keep Emacsens' auto-indent happy */
38 #include "gnunet_util_lib.h"
39 #include "gnunet_ats_service.h"
42 * Version number of the transport API.
44 #define GNUNET_TRANSPORT_VERSION 0x00000000
48 * Function called by the transport for each received message.
51 * @param peer (claimed) identity of the other peer
52 * @param message the message
53 * @param ats performance data
54 * @param ats_count number of entries in ats
56 typedef void (*GNUNET_TRANSPORT_ReceiveCallback) (void *cls,
58 GNUNET_PeerIdentity * peer,
60 GNUNET_MessageHeader *
63 GNUNET_ATS_Information * ats,
68 * Opaque handle to the service.
70 struct GNUNET_TRANSPORT_Handle;
74 * Function called to notify transport users that another
75 * peer connected to us.
78 * @param peer the peer that connected
79 * @param ats performance data
80 * @param ats_count number of entries in ats (excluding 0-termination)
82 typedef void (*GNUNET_TRANSPORT_NotifyConnect) (void *cls,
83 const struct GNUNET_PeerIdentity
86 GNUNET_ATS_Information * ats,
90 * Function called to notify transport users that another
91 * peer disconnected from us.
94 * @param peer the peer that disconnected
96 typedef void (*GNUNET_TRANSPORT_NotifyDisconnect) (void *cls,
98 GNUNET_PeerIdentity * peer);
102 * Function to call with a binary format of an address
105 * @param address NULL on error, otherwise 0-terminated printable UTF-8 string
107 typedef void (*GNUNET_TRANSPORT_AddressLookUpCallback) (void *cls,
108 const char *address);
112 * Function to call with a binary format of an address
115 * @param peer peer identity
116 * @param transport transport plugin
117 * @param addr address
118 * @param addrlen address length
120 typedef void (*GNUNET_TRANSPORT_AddressLookUpBinaryCallback) (void *cls,
131 * Connect to the transport service. Note that the connection may
132 * complete (or fail) asynchronously.
134 * @param cfg configuration to use
135 * @param self our own identity (API should check that it matches
136 * the identity found by transport), or NULL (no check)
137 * @param cls closure for the callbacks
138 * @param rec receive function to call
139 * @param nc function to call on connect events
140 * @param nd function to call on disconnect events
141 * @return NULL on error
143 struct GNUNET_TRANSPORT_Handle *
144 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
145 const struct GNUNET_PeerIdentity *self, void *cls,
146 GNUNET_TRANSPORT_ReceiveCallback rec,
147 GNUNET_TRANSPORT_NotifyConnect nc,
148 GNUNET_TRANSPORT_NotifyDisconnect nd);
152 * Disconnect from the transport service.
154 * @param handle handle returned from connect
157 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle);
161 * Ask the transport service to establish a connection to
164 * @param handle connection to transport service
165 * @param target who we should try to connect to
168 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
169 const struct GNUNET_PeerIdentity *target);
173 * Opaque handle for a transmission-ready request.
175 struct GNUNET_TRANSPORT_TransmitHandle;
179 * Check if we could queue a message of the given size for
180 * transmission. The transport service will take both its internal
181 * buffers and bandwidth limits imposed by the other peer into
182 * consideration when answering this query.
184 * @param handle connection to transport service
185 * @param target who should receive the message
186 * @param size how big is the message we want to transmit?
187 * @param priority how important is the message? @deprecated - remove?
188 * @param timeout after how long should we give up (and call
189 * notify with buf NULL and size 0)?
190 * @param notify function to call when we are ready to
191 * send such a message
192 * @param notify_cls closure for notify
193 * @return NULL if someone else is already waiting to be notified
194 * non-NULL if the notify callback was queued (can be used to cancel
195 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
197 struct GNUNET_TRANSPORT_TransmitHandle *
198 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
199 const struct GNUNET_PeerIdentity
200 *target, size_t size, uint32_t priority,
201 struct GNUNET_TIME_Relative timeout,
202 GNUNET_CONNECTION_TransmitReadyNotify
203 notify, void *notify_cls);
207 * Cancel the specified transmission-ready notification.
209 * @param th handle of the transmission notification request to cancel
212 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
213 GNUNET_TRANSPORT_TransmitHandle
219 * Function called whenever there is an update to the
220 * HELLO of this peer.
223 * @param hello our updated HELLO
225 typedef void (*GNUNET_TRANSPORT_HelloUpdateCallback) (void *cls,
227 GNUNET_MessageHeader *
232 * Handle to cancel a 'GNUNET_TRANSPORT_get_hello' operation.
234 struct GNUNET_TRANSPORT_GetHelloHandle;
238 * Obtain updates on changes to the HELLO message for this peer.
240 * @param handle connection to transport service
241 * @param rec function to call with the HELLO
242 * @param rec_cls closure for rec
243 * @return handle to cancel the operation
245 struct GNUNET_TRANSPORT_GetHelloHandle *
246 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
247 GNUNET_TRANSPORT_HelloUpdateCallback rec,
252 * Stop receiving updates about changes to our HELLO message.
254 * @param ghh handle returned from 'GNUNET_TRANSPORT_get_hello')
257 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh);
261 * Offer the transport service the HELLO of another peer. Note that
262 * the transport service may just ignore this message if the HELLO is
263 * malformed or useless due to our local configuration.
265 * @param handle connection to transport service
266 * @param hello the hello message
267 * @param cont continuation to call when HELLO has been sent
268 * @param cls closure for continuation
271 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
272 const struct GNUNET_MessageHeader *hello,
273 GNUNET_SCHEDULER_Task cont, void *cls);
277 * Handle to cancel a pending address lookup.
279 struct GNUNET_TRANSPORT_AddressLookupContext;
283 * Convert a binary address into a human readable address.
285 * @param cfg configuration to use
286 * @param address address to convert (binary format)
287 * @param addressLen number of bytes in address
288 * @param numeric should (IP) addresses be displayed in numeric form
289 * (otherwise do reverse DNS lookup)
290 * @param nameTrans name of the transport to which the address belongs
291 * @param timeout how long is the lookup allowed to take at most
292 * @param aluc function to call with the results
293 * @param aluc_cls closure for aluc
294 * @return handle to cancel the operation, NULL on error
296 // FIXME: use 'GNUNET_HELLO_Address' here!
297 struct GNUNET_TRANSPORT_AddressLookupContext *
298 GNUNET_TRANSPORT_address_lookup (const struct GNUNET_CONFIGURATION_Handle *cfg,
299 const char *address, size_t addressLen,
300 int numeric, const char *nameTrans,
301 struct GNUNET_TIME_Relative timeout,
302 GNUNET_TRANSPORT_AddressLookUpCallback aluc,
307 * Cancel request for address conversion.
309 * @param alc handle for the request to cancel
312 GNUNET_TRANSPORT_address_lookup_cancel (struct
313 GNUNET_TRANSPORT_AddressLookupContext
318 * Handle to cancel a pending address lookup.
320 struct GNUNET_TRANSPORT_AddressLookupContext;
324 * Return all the known addresses for a peer. FIXME: document better!
325 * FIXME: use better name!
327 * @param cfg configuration to use
328 * @param peer peer identity to look up the addresses of
329 * @param timeout how long is the lookup allowed to take at most
330 * @param peer_address_callback function to call with the results
331 * @param peer_address_callback_cls closure for peer_address_callback
333 struct GNUNET_TRANSPORT_PeerAddressLookupContext *
334 GNUNET_TRANSPORT_peer_address_lookup (const struct GNUNET_CONFIGURATION_Handle
336 const struct GNUNET_PeerIdentity *peer,
337 struct GNUNET_TIME_Relative timeout,
338 GNUNET_TRANSPORT_AddressLookUpCallback
339 peer_address_callback,
340 void *peer_address_callback_cls);
344 * Cancel request for peer lookup.
346 * @param alc handle for the request to cancel
349 GNUNET_TRANSPORT_peer_address_lookup_cancel (struct
350 GNUNET_TRANSPORT_PeerAddressLookupContext
355 * Return all the known addresses. FIXME: document better!
356 * FIXME: use better name! FIXME: extend API to allow cancellation!
358 * @param cfg configuration to use
359 * @param timeout how long is the lookup allowed to take at most
360 * @param peer_address_callback function to call with the results
361 * @param peer_address_callback_cls closure for peer_address_callback
364 GNUNET_TRANSPORT_address_iterate (const struct GNUNET_CONFIGURATION_Handle *cfg,
365 struct GNUNET_TIME_Relative timeout,
366 GNUNET_TRANSPORT_AddressLookUpBinaryCallback
367 peer_address_callback,
368 void *peer_address_callback_cls);
372 * Handle for blacklisting peers.
374 struct GNUNET_TRANSPORT_Blacklist;
378 * Function that decides if a connection is acceptable or not.
381 * @param pid peer to approve or disapproave
382 * @return GNUNET_OK if the connection is allowed
384 typedef int (*GNUNET_TRANSPORT_BlacklistCallback) (void *cls,
386 GNUNET_PeerIdentity * pid);
390 * Install a blacklist callback. The service will be queried for all
391 * existing connections as well as any fresh connections to check if
392 * they are permitted. If the blacklisting callback is unregistered,
393 * all hosts that were denied in the past will automatically be
394 * whitelisted again. Cancelling the blacklist handle is also the
395 * only way to re-enable connections from peers that were previously
398 * @param cfg configuration to use
399 * @param cb callback to invoke to check if connections are allowed
400 * @param cb_cls closure for cb
401 * @return NULL on error, otherwise handle for cancellation
403 struct GNUNET_TRANSPORT_Blacklist *
404 GNUNET_TRANSPORT_blacklist (const struct GNUNET_CONFIGURATION_Handle *cfg,
405 GNUNET_TRANSPORT_BlacklistCallback cb,
410 * Abort the blacklist. Note that this function is the only way for
411 * removing a peer from the blacklist.
413 * @param br handle of the request that is to be cancelled
416 GNUNET_TRANSPORT_blacklist_cancel (struct GNUNET_TRANSPORT_Blacklist *br);
420 #if 0 /* keep Emacsens' auto-indent happy */
427 /* ifndef GNUNET_TRANSPORT_SERVICE_H */
429 /* end of gnunet_transport_service.h */