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3 (C) 2009, 2010, 2011, 2012, 2013 Christian Grothoff (and other contributing authors)
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22 * @file include/gnunet_mesh_service.h
23 * @brief mesh service; establish tunnels to distant peers
24 * @author Christian Grothoff
27 * - need to do sanity check that this is consistent
28 * with current ideas for the multicast layer's needs
31 #ifndef GNUNET_MESH_SERVICE_H
32 #define GNUNET_MESH_SERVICE_H
37 #if 0 /* keep Emacsens' auto-indent happy */
42 #include "gnunet_util_lib.h"
43 #include "gnunet_transport_service.h"
46 * Version number of GNUnet-mesh API.
48 #define GNUNET_MESH_VERSION 0x00000001
52 * Opaque handle to the service.
54 struct GNUNET_MESH_Handle;
57 * Opaque handle to a tunnel.
59 struct GNUNET_MESH_Tunnel;
63 * Functions with this signature are called whenever a message is
66 * Each time the function must call GNUNET_MESH_receive_done on the tunnel
67 * in order to receive the next message. This doesn't need to be immediate:
68 * can be delayed if some processing is done on the message.
70 * @param cls Closure (set from GNUNET_MESH_connect).
71 * @param tunnel Connection to the other end.
72 * @param tunnel_ctx Place to store local state associated with the tunnel.
73 * @param message The actual message.
75 * @return GNUNET_OK to keep the tunnel open,
76 * GNUNET_SYSERR to close it (signal serious error).
78 typedef int (*GNUNET_MESH_MessageCallback) (void *cls,
79 struct GNUNET_MESH_Tunnel *tunnel,
81 const struct GNUNET_MessageHeader *message);
85 * Message handler. Each struct specifies how to handle on particular
86 * type of message received.
88 struct GNUNET_MESH_MessageHandler
91 * Function to call for messages of "type".
93 GNUNET_MESH_MessageCallback callback;
96 * Type of the message this handler covers.
101 * Expected size of messages of this type. Use 0 for variable-size.
102 * If non-zero, messages of the given type will be discarded if they
103 * do not have the right size.
105 uint16_t expected_size;
110 * Method called whenever another peer has added us to a tunnel
111 * the other peer initiated.
112 * Only called (once) upon reception of data with a message type which was
113 * subscribed to in GNUNET_MESH_connect. A call to GNUNET_MESH_tunnel_destroy
114 * causes te tunnel to be ignored and no further notifications are sent about
118 * @param tunnel new handle to the tunnel
119 * @param initiator peer that started the tunnel
120 * @param port Port this tunnel is for.
121 * @return initial tunnel context for the tunnel
122 * (can be NULL -- that's not an error)
124 typedef void *(GNUNET_MESH_InboundTunnelNotificationHandler) (void *cls,
135 * Function called whenever a tunnel is destroyed. Should clean up
136 * any associated state.
138 * It must NOT call GNUNET_MESH_tunnel_destroy on the tunnel.
140 * @param cls closure (set from GNUNET_MESH_connect)
141 * @param tunnel connection to the other end (henceforth invalid)
142 * @param tunnel_ctx place where local state associated
143 * with the tunnel is stored
145 typedef void (GNUNET_MESH_TunnelEndHandler) (void *cls,
146 const struct GNUNET_MESH_Tunnel *
147 tunnel, void *tunnel_ctx);
151 * Connect to the mesh service.
153 * @param cfg Configuration to use.
154 * @param cls Closure for the various callbacks that follow (including
155 * handlers in the handlers array).
156 * @param new_tunnel Function called when an *inbound* tunnel is created.
157 * Can be NULL if no inbound tunnels are desired.
158 * @param cleaner Function called when a tunnel is destroyed by the remote peer.
159 * It is NOT called if GNUNET_MESH_tunnel_destroy is called on
161 * @param handlers Callbacks for messages we care about, NULL-terminated. Each
162 * one must call GNUNET_MESH_receive_done on the tunnel to
163 * receive the next message. Messages of a type that is not
164 * in the handlers array are ignored if received.
165 * @param ports NULL or 0-terminated array of port numbers for incoming tunnels.
167 * @return handle to the mesh service NULL on error
168 * (in this case, init is never called)
170 struct GNUNET_MESH_Handle *
171 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls,
172 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
173 GNUNET_MESH_TunnelEndHandler cleaner,
174 const struct GNUNET_MESH_MessageHandler *handlers,
175 const uint32_t *ports);
179 * Disconnect from the mesh service. All tunnels will be destroyed. All tunnel
180 * disconnect callbacks will be called on any still connected peers, notifying
181 * about their disconnection. The registered inbound tunnel cleaner will be
182 * called should any inbound tunnels still exist.
184 * @param handle connection to mesh to disconnect
187 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle);
191 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
194 * @param h mesh handle
195 * @param tunnel_ctx client's tunnel context to associate with the tunnel
196 * @param peer peer identity the tunnel should go to
197 * @param port Port number.
198 * @return handle to the tunnel
200 struct GNUNET_MESH_Tunnel *
201 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h,
203 const struct GNUNET_PeerIdentity *peer,
208 * Destroy an existing tunnel.
210 * The existing end callback for the tunnel will be called immediately.
211 * Any pending outgoing messages will be sent but no incoming messages will be
212 * accepted and no data callbacks will be called.
214 * @param tunnel Tunnel handle, becomes invalid after this call.
217 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel);
221 * Turn on/off the buffering status of the tunnel.
223 * @param tunnel Tunnel affected.
224 * @param buffer GNUNET_YES to turn buffering on (default),
225 * GNUNET_NO otherwise.
228 GNUNET_MESH_tunnel_buffer (struct GNUNET_MESH_Tunnel *tunnel, int buffer);
232 * Handle for a transmission request.
234 struct GNUNET_MESH_TransmitHandle;
238 * Ask the mesh to call "notify" once it is ready to transmit the
239 * given number of bytes to the specified tunnel.
240 * Only one call can be active at any time, to issue another request,
241 * wait for the callback or cancel the current request.
243 * @param tunnel tunnel to use for transmission
244 * @param cork is corking allowed for this transmission?
245 * @param maxdelay how long can the message wait?
246 * @param notify_size how many bytes of buffer space does notify want?
247 * @param notify function to call when buffer space is available;
248 * will be called with NULL on timeout or if the overall queue
249 * for this peer is larger than queue_size and this is currently
250 * the message with the lowest priority
251 * @param notify_cls closure for notify
252 * @return non-NULL if the notify callback was queued,
253 * NULL if we can not even queue the request (insufficient
254 * memory); if NULL is returned, "notify" will NOT be called.
256 struct GNUNET_MESH_TransmitHandle *
257 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
258 struct GNUNET_TIME_Relative maxdelay,
260 GNUNET_CONNECTION_TransmitReadyNotify notify,
265 * Cancel the specified transmission-ready notification.
267 * @param th handle that was returned by "notify_transmit_ready".
270 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle
275 * Indicate readiness to receive the next message on a tunnel.
277 * Should only be called once per handler called.
279 * @param tunnel Tunnel that will be allowed to call another handler.
282 GNUNET_MESH_receive_done (struct GNUNET_MESH_Tunnel *tunnel);
286 /******************************************************************************/
287 /******************** MONITORING /DEBUG API *************************/
288 /******************************************************************************/
289 /* The following calls are not useful for normal MESH operation, but for */
290 /* debug and monitoring of the mesh state. They can be safely ignored. */
291 /* The API can change at any point without notice. */
292 /* Please contact the developer if you consider any of this calls useful for */
293 /* normal mesh applications. */
294 /******************************************************************************/
297 * Method called to retrieve information about each tunnel the mesh peer
300 * @param cls Closure.
301 * @param tunnel_number Tunnel number.
302 * @param origin that started the tunnel (owner).
303 * @param target other endpoint of the tunnel
305 typedef void (*GNUNET_MESH_TunnelsCB) (void *cls,
306 uint32_t tunnel_number,
307 const struct GNUNET_PeerIdentity *origin,
308 const struct GNUNET_PeerIdentity *target);
312 * Method called to retrieve information about a specific tunnel the mesh peer
313 * is aware of, including all transit nodes.
315 * @param cls Closure.
316 * @param peer Peer in the tunnel's tree.
317 * @param parent Parent of the current peer. All 0 when peer is root.
319 typedef void (*GNUNET_MESH_TunnelCB) (void *cls,
320 const struct GNUNET_PeerIdentity *peer,
321 const struct GNUNET_PeerIdentity *parent);
325 * Request information about the running mesh peer.
326 * The callback will be called for every tunnel known to the service,
327 * listing all active peers that belong to the tunnel.
329 * If called again on the same handle, it will overwrite the previous
330 * callback and cls. To retrieve the cls, monitor_cancel must be
333 * WARNING: unstable API, likely to change in the future!
335 * @param h Handle to the mesh peer.
336 * @param callback Function to call with the requested data.
337 * @param callback_cls Closure for @c callback.
340 GNUNET_MESH_get_tunnels (struct GNUNET_MESH_Handle *h,
341 GNUNET_MESH_TunnelsCB callback,
346 * Request information about a specific tunnel of the running mesh peer.
348 * WARNING: unstable API, likely to change in the future!
350 * @param h Handle to the mesh peer.
351 * @param initiator ID of the owner of the tunnel.
352 * @param tunnel_number Tunnel number.
353 * @param callback Function to call with the requested data.
354 * @param callback_cls Closure for @c callback.
357 GNUNET_MESH_show_tunnel (struct GNUNET_MESH_Handle *h,
358 struct GNUNET_PeerIdentity *initiator,
359 uint32_t tunnel_number,
360 GNUNET_MESH_TunnelCB callback,
365 * Cancel a monitor request. The monitor callback will not be called.
367 * WARNING: unstable API, likely to change in the future!
369 * @param h Mesh handle.
371 * @return Closure given to GNUNET_MESH_monitor, if any.
374 GNUNET_MESH_get_tunnels_cancel (struct GNUNET_MESH_Handle *h);
378 * Create a message queue for a mesh tunnel.
379 * The message queue can only be used to transmit messages,
380 * not to receive them.
382 * @param tunnel the tunnel to create the message qeue for
383 * @return a message queue to messages over the tunnel
385 struct GNUNET_MQ_Handle *
386 GNUNET_MESH_mq_create (struct GNUNET_MESH_Tunnel *tunnel);
389 #if 0 /* keep Emacsens' auto-indent happy */
396 /* ifndef GNUNET_MESH_SERVICE_H */
398 /* end of gnunet_mesh_service.h */