2 This file is part of GNUnet.
3 (C) 2009 - 2013 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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22 * @file include/gnunet_mesh_service_enc.h
23 * @brief mesh service; establish channels to distant peers
24 * @author Christian Grothoff
27 #ifndef GNUNET_MESH_SERVICE_H
28 #define GNUNET_MESH_SERVICE_H
33 #if 0 /* keep Emacsens' auto-indent happy */
38 #include "gnunet_util_lib.h"
39 #include "gnunet_transport_service.h"
42 * Version number of GNUnet-mesh API.
44 #define GNUNET_MESH_VERSION 0x00000003
48 * Opaque handle to the service.
50 struct GNUNET_MESH_Handle;
53 * Opaque handle to a channel.
55 struct GNUNET_MESH_Channel;
60 * Second line indicates filed in the MeshChannelInfo union carrying the answer.
65 * Disable buffering on intermediate nodes (for minimum latency).
68 GNUNET_MESH_OPTION_NOBUFFER = 0x1,
71 * Enable channel reliability, lost messages will be retransmitted.
74 GNUNET_MESH_OPTION_RELIABLE = 0x2,
77 * Enable out of order delivery of messages.
80 GNUNET_MESH_OPTION_OOORDER = 0x4,
83 * Who is the peer at the other end of the channel.
84 * struct GNUNET_PeerIdentity *peer
86 GNUNET_MESH_OPTION_PEER = 0x8
92 * Functions with this signature are called whenever a message is
95 * Each time the function must call GNUNET_MESH_receive_done on the channel
96 * in order to receive the next message. This doesn't need to be immediate:
97 * can be delayed if some processing is done on the message.
99 * @param cls Closure (set from GNUNET_MESH_connect).
100 * @param channel Connection to the other end.
101 * @param channel_ctx Place to store local state associated with the channel.
102 * @param message The actual message.
104 * @return GNUNET_OK to keep the channel open,
105 * GNUNET_SYSERR to close it (signal serious error).
107 typedef int (*GNUNET_MESH_MessageCallback) (void *cls,
108 struct GNUNET_MESH_Channel *channel,
110 const struct GNUNET_MessageHeader *message);
114 * Message handler. Each struct specifies how to handle on particular
115 * type of message received.
117 struct GNUNET_MESH_MessageHandler
120 * Function to call for messages of "type".
122 GNUNET_MESH_MessageCallback callback;
125 * Type of the message this handler covers.
130 * Expected size of messages of this type. Use 0 for variable-size.
131 * If non-zero, messages of the given type will be discarded if they
132 * do not have the right size.
134 uint16_t expected_size;
139 * Method called whenever another peer has added us to a channel
140 * the other peer initiated.
141 * Only called (once) upon reception of data with a message type which was
142 * subscribed to in GNUNET_MESH_connect. A call to GNUNET_MESH_channel_destroy
143 * causes te channel to be ignored and no further notifications are sent about
147 * @param channel new handle to the channel
148 * @param initiator peer that started the channel
149 * @param port Port this channel is for.
150 * @return initial channel context for the channel
151 * (can be NULL -- that's not an error)
153 typedef void *(GNUNET_MESH_InboundChannelNotificationHandler) (void *cls,
164 * Function called whenever a channel is destroyed. Should clean up
165 * any associated state.
167 * It must NOT call GNUNET_MESH_channel_destroy on the channel.
169 * @param cls closure (set from GNUNET_MESH_connect)
170 * @param channel connection to the other end (henceforth invalid)
171 * @param channel_ctx place where local state associated
172 * with the channel is stored
174 typedef void (GNUNET_MESH_ChannelEndHandler) (void *cls,
175 const struct GNUNET_MESH_Channel *
181 * Connect to the mesh service.
183 * @param cfg Configuration to use.
184 * @param cls Closure for the various callbacks that follow (including
185 * handlers in the handlers array).
186 * @param new_channel Function called when an *incoming* channel is created.
187 * Can be NULL if no inbound channels are desired.
189 * @param cleaner Function called when a channel is destroyed by the remote peer.
190 * It is NOT called if GNUNET_MESH_channel_destroy is called on
192 * @param handlers Callbacks for messages we care about, NULL-terminated. Each
193 * one must call GNUNET_MESH_receive_done on the channel to
194 * receive the next message. Messages of a type that is not
195 * in the handlers array are ignored if received.
196 * @param ports NULL or 0-terminated array of port numbers for incoming channels.
197 * See @c new_channel.
199 * @return handle to the mesh service NULL on error
200 * (in this case, init is never called)
202 struct GNUNET_MESH_Handle *
203 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls,
204 GNUNET_MESH_InboundChannelNotificationHandler new_channel,
205 GNUNET_MESH_ChannelEndHandler cleaner,
206 const struct GNUNET_MESH_MessageHandler *handlers,
207 const uint32_t *ports);
211 * Disconnect from the mesh service. All channels will be destroyed. All channel
212 * disconnect callbacks will be called on any still connected peers, notifying
213 * about their disconnection. The registered inbound channel cleaner will be
214 * called should any inbound channels still exist.
216 * @param handle connection to mesh to disconnect
219 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle);
223 * Create a new channel (we're initiator and will be allowed to add/remove peers
226 * @param h mesh handle
227 * @param channel_ctx client's channel context to associate with the channel
228 * @param peer peer identity the channel should go to
229 * @param port Port number.
230 * @param nobuffer Flag for disabling buffering on relay nodes.
231 * @param reliable Flag for end-to-end reliability.
233 * @return handle to the channel
235 struct GNUNET_MESH_Channel *
236 GNUNET_MESH_channel_create (struct GNUNET_MESH_Handle *h,
238 const struct GNUNET_PeerIdentity *peer,
245 * Destroy an existing channel.
247 * The existing end callback for the channel will be called immediately.
248 * Any pending outgoing messages will be sent but no incoming messages will be
249 * accepted and no data callbacks will be called.
251 * @param channel Channel handle, becomes invalid after this call.
254 GNUNET_MESH_channel_destroy (struct GNUNET_MESH_Channel *channel);
258 * Struct to retrieve info about a channel.
260 union MeshChannelInfo {
263 * GNUNET_YES / GNUNET_NO, for binary flags.
268 * Peer on the other side of the channel
270 struct GNUNET_PeerIdentity *peer;
275 * Get information about a channel.
277 * @param channel Channel handle.
278 * @param option Query type GNUNET_MESH_OPTION_*
279 * @param ... dependant on option, currently not used
281 * @return Union with an answer to the query.
283 const union MeshChannelInfo *
284 GNUNET_MESH_channel_get_info (struct GNUNET_MESH_Channel *channel,
285 enum MeshOption option, ...);
289 * Handle for a transmission request.
291 struct GNUNET_MESH_TransmitHandle;
295 * Ask the mesh to call "notify" once it is ready to transmit the
296 * given number of bytes to the specified channel.
297 * Only one call can be active at any time, to issue another request,
298 * wait for the callback or cancel the current request.
300 * @param channel channel to use for transmission
301 * @param cork is corking allowed for this transmission?
302 * @param maxdelay how long can the message wait?
303 * @param notify_size how many bytes of buffer space does notify want?
304 * @param notify function to call when buffer space is available;
305 * will be called with NULL on timeout or if the overall queue
306 * for this peer is larger than queue_size and this is currently
307 * the message with the lowest priority
308 * @param notify_cls closure for notify
309 * @return non-NULL if the notify callback was queued,
310 * NULL if we can not even queue the request (insufficient
311 * memory); if NULL is returned, "notify" will NOT be called.
313 struct GNUNET_MESH_TransmitHandle *
314 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Channel *channel,
316 struct GNUNET_TIME_Relative maxdelay,
318 GNUNET_CONNECTION_TransmitReadyNotify notify,
323 * Cancel the specified transmission-ready notification.
325 * @param th handle that was returned by "notify_transmit_ready".
328 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle
333 * Indicate readiness to receive the next message on a channel.
335 * Should only be called once per handler called.
337 * @param channel Channel that will be allowed to call another handler.
340 GNUNET_MESH_receive_done (struct GNUNET_MESH_Channel *channel);
344 /******************************************************************************/
345 /******************** MONITORING /DEBUG API *************************/
346 /******************************************************************************/
347 /* The following calls are not useful for normal MESH operation, but for */
348 /* debug and monitoring of the mesh state. They can be safely ignored. */
349 /* The API can change at any point without notice. */
350 /* Please contact the developer if you consider any of this calls useful for */
351 /* normal mesh applications. */
352 /******************************************************************************/
355 * Method called to retrieve information about each channel the mesh peer
358 * @param cls Closure.
359 * @param channel_number Channel number.
360 * @param origin that started the channel (owner).
361 * @param target other endpoint of the channel
363 typedef void (*GNUNET_MESH_ChannelsCB) (void *cls,
364 uint32_t channel_number,
365 const struct GNUNET_PeerIdentity *origin,
366 const struct GNUNET_PeerIdentity *target);
370 * Method called to retrieve information about a specific channel the mesh peer
371 * is aware of, including all transit nodes.
373 * @param cls Closure.
374 * @param peer Peer in the channel's tree.
375 * @param parent Parent of the current peer. All 0 when peer is root.
377 typedef void (*GNUNET_MESH_ChannelCB) (void *cls,
378 const struct GNUNET_PeerIdentity *peer,
379 const struct GNUNET_PeerIdentity *parent);
383 * Request information about the running mesh peer.
384 * The callback will be called for every channel known to the service,
385 * listing all active peers that belong to the channel.
387 * If called again on the same handle, it will overwrite the previous
388 * callback and cls. To retrieve the cls, monitor_cancel must be
391 * WARNING: unstable API, likely to change in the future!
393 * @param h Handle to the mesh peer.
394 * @param callback Function to call with the requested data.
395 * @param callback_cls Closure for @c callback.
398 GNUNET_MESH_get_channels (struct GNUNET_MESH_Handle *h,
399 GNUNET_MESH_ChannelsCB callback,
404 * Request information about a specific channel of the running mesh peer.
406 * WARNING: unstable API, likely to change in the future!
408 * @param h Handle to the mesh peer.
409 * @param initiator ID of the owner of the channel.
410 * @param channel_number Channel number.
411 * @param callback Function to call with the requested data.
412 * @param callback_cls Closure for @c callback.
415 GNUNET_MESH_show_channel (struct GNUNET_MESH_Handle *h,
416 struct GNUNET_PeerIdentity *initiator,
417 uint32_t channel_number,
418 GNUNET_MESH_ChannelCB callback,
423 * Cancel a monitor request. The monitor callback will not be called.
425 * WARNING: unstable API, likely to change in the future!
427 * @param h Mesh handle.
429 * @return Closure given to GNUNET_MESH_monitor, if any.
432 GNUNET_MESH_get_channels_cancel (struct GNUNET_MESH_Handle *h);
436 * Create a message queue for a mesh channel.
437 * The message queue can only be used to transmit messages,
438 * not to receive them.
440 * @param channel the channel to create the message qeue for
441 * @return a message queue to messages over the channel
443 struct GNUNET_MQ_Handle *
444 GNUNET_MESH_mq_create (struct GNUNET_MESH_Channel *channel);
447 #if 0 /* keep Emacsens' auto-indent happy */
454 /* ifndef GNUNET_MESH_SERVICE_H */
456 /* end of gnunet_mesh_service.h */