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3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
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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 // RENAME: AddressToStringCallback
108 typedef void (*GNUNET_TRANSPORT_AddressLookUpCallback) (void *cls,
109 const char *address);
113 * Function to call with a binary format of an address
116 * @param peer peer identity
117 * @param transport transport plugin
118 * @param addr address
119 * @param addrlen address length
121 // FIXME: use GNUNET_HELLO_Address (as 2nd arg, replacing others)
122 // FIXME: rename: remove "Binary"
123 // FIXME: use NULL for address on disconnect IF in monitor mode (one_shot = NO)
124 typedef void (*GNUNET_TRANSPORT_AddressLookUpBinaryCallback) (void *cls,
135 * Connect to the transport service. Note that the connection may
136 * complete (or fail) asynchronously.
138 * @param cfg configuration to use
139 * @param self our own identity (API should check that it matches
140 * the identity found by transport), or NULL (no check)
141 * @param cls closure for the callbacks
142 * @param rec receive function to call
143 * @param nc function to call on connect events
144 * @param nd function to call on disconnect events
145 * @return NULL on error
147 struct GNUNET_TRANSPORT_Handle *
148 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
149 const struct GNUNET_PeerIdentity *self, void *cls,
150 GNUNET_TRANSPORT_ReceiveCallback rec,
151 GNUNET_TRANSPORT_NotifyConnect nc,
152 GNUNET_TRANSPORT_NotifyDisconnect nd);
156 * Disconnect from the transport service.
158 * @param handle handle returned from connect
161 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle);
165 * Ask the transport service to establish a connection to
168 * @param handle connection to transport service
169 * @param target who we should try to connect to
172 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
173 const struct GNUNET_PeerIdentity *target);
177 * Opaque handle for a transmission-ready request.
179 struct GNUNET_TRANSPORT_TransmitHandle;
183 * Check if we could queue a message of the given size for
184 * transmission. The transport service will take both its internal
185 * buffers and bandwidth limits imposed by the other peer into
186 * consideration when answering this query.
188 * @param handle connection to transport service
189 * @param target who should receive the message
190 * @param size how big is the message we want to transmit?
191 * @param priority how important is the message? @deprecated - remove?
192 * @param timeout after how long should we give up (and call
193 * notify with buf NULL and size 0)?
194 * @param notify function to call when we are ready to
195 * send such a message
196 * @param notify_cls closure for notify
197 * @return NULL if someone else is already waiting to be notified
198 * non-NULL if the notify callback was queued (can be used to cancel
199 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
201 struct GNUNET_TRANSPORT_TransmitHandle *
202 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
203 const struct GNUNET_PeerIdentity
204 *target, size_t size, uint32_t priority,
205 struct GNUNET_TIME_Relative timeout,
206 GNUNET_CONNECTION_TransmitReadyNotify
207 notify, void *notify_cls);
211 * Cancel the specified transmission-ready notification.
213 * @param th handle of the transmission notification request to cancel
216 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
217 GNUNET_TRANSPORT_TransmitHandle
223 * Function called whenever there is an update to the
224 * HELLO of this peer.
227 * @param hello our updated HELLO
229 typedef void (*GNUNET_TRANSPORT_HelloUpdateCallback) (void *cls,
231 GNUNET_MessageHeader *
236 * Handle to cancel a 'GNUNET_TRANSPORT_get_hello' operation.
238 struct GNUNET_TRANSPORT_GetHelloHandle;
242 * Obtain updates on changes to the HELLO message for this peer.
244 * @param handle connection to transport service
245 * @param rec function to call with the HELLO
246 * @param rec_cls closure for rec
247 * @return handle to cancel the operation
249 struct GNUNET_TRANSPORT_GetHelloHandle *
250 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
251 GNUNET_TRANSPORT_HelloUpdateCallback rec,
256 * Stop receiving updates about changes to our HELLO message.
258 * @param ghh handle returned from 'GNUNET_TRANSPORT_get_hello')
261 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh);
265 * Offer the transport service the HELLO of another peer. Note that
266 * the transport service may just ignore this message if the HELLO is
267 * malformed or useless due to our local configuration.
269 * @param handle connection to transport service
270 * @param hello the hello message
271 * @param cont continuation to call when HELLO has been sent
272 * @param cls closure for continuation
275 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
276 const struct GNUNET_MessageHeader *hello,
277 GNUNET_SCHEDULER_Task cont, void *cls);
281 * Handle to cancel a pending address lookup.
283 struct GNUNET_TRANSPORT_AddressLookupContext;
287 * Convert a binary address into a human readable address.
289 * @param cfg configuration to use
290 * @param address address to convert (binary format)
291 * @param addressLen number of bytes in address
292 * @param numeric should (IP) addresses be displayed in numeric form
293 * (otherwise do reverse DNS lookup)
294 * @param nameTrans name of the transport to which the address belongs
295 * @param timeout how long is the lookup allowed to take at most
296 * @param aluc function to call with the results
297 * @param aluc_cls closure for aluc
298 * @return handle to cancel the operation, NULL on error
300 // FIXME: use 'GNUNET_HELLO_Address' here!
301 // => rename: address_to_string
302 struct GNUNET_TRANSPORT_AddressLookupContext *
303 GNUNET_TRANSPORT_address_lookup (const struct GNUNET_CONFIGURATION_Handle *cfg,
304 const char *address, size_t addressLen,
305 int numeric, const char *nameTrans,
306 struct GNUNET_TIME_Relative timeout,
307 GNUNET_TRANSPORT_AddressLookUpCallback aluc,
312 * Cancel request for address conversion.
314 * @param alc handle for the request to cancel
317 GNUNET_TRANSPORT_address_lookup_cancel (struct
318 GNUNET_TRANSPORT_AddressLookupContext
323 * Handle to cancel a pending address lookup.
325 struct GNUNET_TRANSPORT_AddressLookupContext;
329 * Return all the known addresses for a peer. FIXME: document better!
330 * FIXME: use better name!
331 * CHANGE: Returns the address(es) that we are currently using for this
332 * peer. Upon completion, the 'AddressLookUpCallback' is called one more
333 * time with 'NULL' for the address and the peer. After this, the operation must no
334 * longer be explicitly cancelled.
335 * TODO: change code that uses this API to see if this is fine...
337 * @param cfg configuration to use
338 * @param peer peer identity to look up the addresses of, CHANGE: allow NULL for all (connected) peers
339 * FIXME: @param one_shot GNUNET_YES to return the current state and then end (with NULL+NULL),
340 * GNUNET_NO to monitor the set of addresses used (continuously, must be explicitly cancelled)
341 * @param timeout how long is the lookup allowed to take at most
342 * @param peer_address_callback function to call with the results
343 * @param peer_address_callback_cls closure for peer_address_callback
345 // RENAME: peer_get_active_addresses
346 struct GNUNET_TRANSPORT_PeerAddressLookupContext *
347 GNUNET_TRANSPORT_peer_address_lookup (const struct GNUNET_CONFIGURATION_Handle
349 const struct GNUNET_PeerIdentity *peer,
350 // FIXME: add argument: one_shot
351 struct GNUNET_TIME_Relative timeout,
352 // FIXME: change to the 'Binary' lookup callback (which will
353 // be renamed, so the argument type actually won't change)
354 GNUNET_TRANSPORT_AddressLookUpCallback
355 peer_address_callback,
356 void *peer_address_callback_cls);
360 * Cancel request for peer lookup.
362 * @param alc handle for the request to cancel
365 GNUNET_TRANSPORT_peer_address_lookup_cancel (struct
366 GNUNET_TRANSPORT_PeerAddressLookupContext
371 * Return all the known addresses. FIXME: document better!
373 * FIXME: remove, replace with new 'peer_address_lookup' API
376 * @param cfg configuration to use
377 * @param timeout how long is the lookup allowed to take at most
378 * @param peer_address_callback function to call with the results
379 * @param peer_address_callback_cls closure for peer_address_callback
382 GNUNET_TRANSPORT_address_iterate (const struct GNUNET_CONFIGURATION_Handle *cfg,
383 struct GNUNET_TIME_Relative timeout,
384 GNUNET_TRANSPORT_AddressLookUpBinaryCallback
385 peer_address_callback,
386 void *peer_address_callback_cls);
390 * Handle for blacklisting peers.
392 struct GNUNET_TRANSPORT_Blacklist;
396 * Function that decides if a connection is acceptable or not.
399 * @param pid peer to approve or disapproave
400 * @return GNUNET_OK if the connection is allowed
402 typedef int (*GNUNET_TRANSPORT_BlacklistCallback) (void *cls,
404 GNUNET_PeerIdentity * pid);
408 * Install a blacklist callback. The service will be queried for all
409 * existing connections as well as any fresh connections to check if
410 * they are permitted. If the blacklisting callback is unregistered,
411 * all hosts that were denied in the past will automatically be
412 * whitelisted again. Cancelling the blacklist handle is also the
413 * only way to re-enable connections from peers that were previously
416 * @param cfg configuration to use
417 * @param cb callback to invoke to check if connections are allowed
418 * @param cb_cls closure for cb
419 * @return NULL on error, otherwise handle for cancellation
421 struct GNUNET_TRANSPORT_Blacklist *
422 GNUNET_TRANSPORT_blacklist (const struct GNUNET_CONFIGURATION_Handle *cfg,
423 GNUNET_TRANSPORT_BlacklistCallback cb,
428 * Abort the blacklist. Note that this function is the only way for
429 * removing a peer from the blacklist.
431 * @param br handle of the request that is to be cancelled
434 GNUNET_TRANSPORT_blacklist_cancel (struct GNUNET_TRANSPORT_Blacklist *br);
438 #if 0 /* keep Emacsens' auto-indent happy */
445 /* ifndef GNUNET_TRANSPORT_SERVICE_H */
447 /* end of gnunet_transport_service.h */