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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 typedef void (*GNUNET_TRANSPORT_AddressToStringCallback) (void *cls,
108 const char *address);
112 * Function to call with a binary format of an address
115 * @param address address
117 // FIXME: use NULL for address on disconnect IF in monitor mode (one_shot = NO)
118 typedef void (*GNUNET_TRANSPORT_AddressLookUpCallback) (void *cls,
119 const struct GNUNET_HELLO_Address *address);
123 * Connect to the transport service. Note that the connection may
124 * complete (or fail) asynchronously.
126 * @param cfg configuration to use
127 * @param self our own identity (API should check that it matches
128 * the identity found by transport), or NULL (no check)
129 * @param cls closure for the callbacks
130 * @param rec receive function to call
131 * @param nc function to call on connect events
132 * @param nd function to call on disconnect events
133 * @return NULL on error
135 struct GNUNET_TRANSPORT_Handle *
136 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
137 const struct GNUNET_PeerIdentity *self, void *cls,
138 GNUNET_TRANSPORT_ReceiveCallback rec,
139 GNUNET_TRANSPORT_NotifyConnect nc,
140 GNUNET_TRANSPORT_NotifyDisconnect nd);
144 * Disconnect from the transport service.
146 * @param handle handle returned from connect
149 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle);
153 * Ask the transport service to establish a connection to
156 * @param handle connection to transport service
157 * @param target who we should try to connect to
160 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
161 const struct GNUNET_PeerIdentity *target);
165 * Opaque handle for a transmission-ready request.
167 struct GNUNET_TRANSPORT_TransmitHandle;
171 * Check if we could queue a message of the given size for
172 * transmission. The transport service will take both its internal
173 * buffers and bandwidth limits imposed by the other peer into
174 * consideration when answering this query.
176 * @param handle connection to transport service
177 * @param target who should receive the message
178 * @param size how big is the message we want to transmit?
179 * @param priority how important is the message? @deprecated - remove?
180 * @param timeout after how long should we give up (and call
181 * notify with buf NULL and size 0)?
182 * @param notify function to call when we are ready to
183 * send such a message
184 * @param notify_cls closure for notify
185 * @return NULL if someone else is already waiting to be notified
186 * non-NULL if the notify callback was queued (can be used to cancel
187 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
189 struct GNUNET_TRANSPORT_TransmitHandle *
190 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
191 const struct GNUNET_PeerIdentity
192 *target, size_t size, uint32_t priority,
193 struct GNUNET_TIME_Relative timeout,
194 GNUNET_CONNECTION_TransmitReadyNotify
195 notify, void *notify_cls);
199 * Cancel the specified transmission-ready notification.
201 * @param th handle of the transmission notification request to cancel
204 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
205 GNUNET_TRANSPORT_TransmitHandle
211 * Function called whenever there is an update to the
212 * HELLO of this peer.
215 * @param hello our updated HELLO
217 typedef void (*GNUNET_TRANSPORT_HelloUpdateCallback) (void *cls,
219 GNUNET_MessageHeader *
224 * Handle to cancel a 'GNUNET_TRANSPORT_get_hello' operation.
226 struct GNUNET_TRANSPORT_GetHelloHandle;
230 * Obtain updates on changes to the HELLO message for this peer.
232 * @param handle connection to transport service
233 * @param rec function to call with the HELLO
234 * @param rec_cls closure for rec
235 * @return handle to cancel the operation
237 struct GNUNET_TRANSPORT_GetHelloHandle *
238 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
239 GNUNET_TRANSPORT_HelloUpdateCallback rec,
244 * Stop receiving updates about changes to our HELLO message.
246 * @param ghh handle returned from 'GNUNET_TRANSPORT_get_hello')
249 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh);
253 * Offer the transport service the HELLO of another peer. Note that
254 * the transport service may just ignore this message if the HELLO is
255 * malformed or useless due to our local configuration.
257 * @param handle connection to transport service
258 * @param hello the hello message
259 * @param cont continuation to call when HELLO has been sent
260 * @param cls closure for continuation
263 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
264 const struct GNUNET_MessageHeader *hello,
265 GNUNET_SCHEDULER_Task cont, void *cls);
269 * Handle to cancel a pending address lookup.
271 struct GNUNET_TRANSPORT_AddressToStringContext;
275 * Convert a binary address into a human readable address.
277 * @param cfg configuration to use
278 * @param address address to convert (binary format)
279 * @param addressLen number of bytes in address
280 * @param numeric should (IP) addresses be displayed in numeric form
281 * (otherwise do reverse DNS lookup)
282 * @param nameTrans name of the transport to which the address belongs
283 * @param timeout how long is the lookup allowed to take at most
284 * @param aluc function to call with the results
285 * @param aluc_cls closure for aluc
286 * @return handle to cancel the operation, NULL on error
288 struct GNUNET_TRANSPORT_AddressToStringContext *
289 GNUNET_TRANSPORT_address_to_string (const struct GNUNET_CONFIGURATION_Handle *cfg,
290 const struct GNUNET_HELLO_Address *address,
292 struct GNUNET_TIME_Relative timeout,
293 GNUNET_TRANSPORT_AddressToStringCallback aluc,
298 * Cancel request for address conversion.
300 * @param alc handle for the request to cancel
303 GNUNET_TRANSPORT_address_to_string_cancel (struct
304 GNUNET_TRANSPORT_AddressToStringContext
309 * Return all the known addresses for a specific peer or all peers.
310 * Returns continously all address if one_shot is set to GNUNET_NO
312 * CHANGE: Returns the address(es) that we are currently using for this
313 * peer. Upon completion, the 'AddressLookUpCallback' is called one more
314 * time with 'NULL' for the address and the peer. After this, the operation must no
315 * longer be explicitly cancelled.
317 * @param cfg configuration to use
318 * @param peer peer identity to look up the addresses of, CHANGE: allow NULL for all (connected) peers
319 * @param one_shot GNUNET_YES to return the current state and then end (with NULL+NULL),
320 * GNUNET_NO to monitor the set of addresses used (continuously, must be explicitly cancelled)
321 * @param timeout how long is the lookup allowed to take at most
322 * @param peer_address_callback function to call with the results
323 * @param peer_address_callback_cls closure for peer_address_callback
325 struct GNUNET_TRANSPORT_PeerAddressLookupContext *
326 GNUNET_TRANSPORT_peer_get_active_addresses (const struct GNUNET_CONFIGURATION_Handle *cfg,
327 const struct GNUNET_PeerIdentity *peer,
329 struct GNUNET_TIME_Relative timeout,
330 GNUNET_TRANSPORT_AddressLookUpCallback peer_address_callback,
331 void *peer_address_callback_cls);
335 * Cancel request for peer lookup.
337 * @param alc handle for the request to cancel
340 GNUNET_TRANSPORT_peer_get_active_addresses_cancel (struct
341 GNUNET_TRANSPORT_PeerAddressLookupContext
346 * Return all the known addresses. FIXME: document better!
348 * FIXME: remove, replace with new 'peer_address_lookup' API
351 * @param cfg configuration to use
352 * @param timeout how long is the lookup allowed to take at most
353 * @param peer_address_callback function to call with the results
354 * @param peer_address_callback_cls closure for peer_address_callback
357 GNUNET_TRANSPORT_address_iterate (const struct GNUNET_CONFIGURATION_Handle *cfg,
358 struct GNUNET_TIME_Relative timeout,
359 GNUNET_TRANSPORT_AddressLookUpCallback
360 peer_address_callback,
361 void *peer_address_callback_cls);
365 * Handle for blacklisting peers.
367 struct GNUNET_TRANSPORT_Blacklist;
371 * Function that decides if a connection is acceptable or not.
374 * @param pid peer to approve or disapproave
375 * @return GNUNET_OK if the connection is allowed
377 typedef int (*GNUNET_TRANSPORT_BlacklistCallback) (void *cls,
379 GNUNET_PeerIdentity * pid);
383 * Install a blacklist callback. The service will be queried for all
384 * existing connections as well as any fresh connections to check if
385 * they are permitted. If the blacklisting callback is unregistered,
386 * all hosts that were denied in the past will automatically be
387 * whitelisted again. Cancelling the blacklist handle is also the
388 * only way to re-enable connections from peers that were previously
391 * @param cfg configuration to use
392 * @param cb callback to invoke to check if connections are allowed
393 * @param cb_cls closure for cb
394 * @return NULL on error, otherwise handle for cancellation
396 struct GNUNET_TRANSPORT_Blacklist *
397 GNUNET_TRANSPORT_blacklist (const struct GNUNET_CONFIGURATION_Handle *cfg,
398 GNUNET_TRANSPORT_BlacklistCallback cb,
403 * Abort the blacklist. Note that this function is the only way for
404 * removing a peer from the blacklist.
406 * @param br handle of the request that is to be cancelled
409 GNUNET_TRANSPORT_blacklist_cancel (struct GNUNET_TRANSPORT_Blacklist *br);
413 #if 0 /* keep Emacsens' auto-indent happy */
420 /* ifndef GNUNET_TRANSPORT_SERVICE_H */
422 /* end of gnunet_transport_service.h */