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3 (C) 2009, 2010 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 #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 0x00000000
48 * Opaque handle to the service.
50 struct GNUNET_MESH_Handle;
53 * Opaque handle to a tunnel.
55 struct GNUNET_MESH_Tunnel;
58 * Functions with this signature are called whenever a message is
59 * received or transmitted.
61 * @param cls closure (set from GNUNET_MESH_connect)
62 * @param tunnel connection to the other end
63 * @param tunnel_ctx place to store local state associated with the tunnel
64 * @param sender who sent the message
65 * @param message the actual message
66 * @param atsi performance data for the connection
67 * @return GNUNET_OK to keep the connection open,
68 * GNUNET_SYSERR to close it (signal serious error)
70 typedef int (*GNUNET_MESH_MessageCallback) (void *cls,
71 struct GNUNET_MESH_Tunnel * tunnel,
73 const struct GNUNET_PeerIdentity *
75 const struct GNUNET_MessageHeader *
78 GNUNET_ATS_Information *
83 * Message handler. Each struct specifies how to handle on particular
84 * type of message received.
86 struct GNUNET_MESH_MessageHandler
89 * Function to call for messages of "type".
91 GNUNET_MESH_MessageCallback callback;
94 * Type of the message this handler covers.
99 * Expected size of messages of this type. Use 0 for variable-size.
100 * If non-zero, messages of the given type will be discarded if they
101 * do not have the right size.
103 uint16_t expected_size;
109 * Function called whenever an inbound tunnel is destroyed. Should clean up
110 * any associated state.
112 * @param cls closure (set from GNUNET_MESH_connect)
113 * @param tunnel connection to the other end (henceforth invalid)
114 * @param tunnel_ctx place where local state associated with the tunnel is stored
116 typedef void (GNUNET_MESH_TunnelEndHandler) (void *cls,
117 const struct GNUNET_MESH_Tunnel *
118 tunnel, void **tunnel_ctx);
122 * Type for an application. Values defined in gnunet_applications.h
124 typedef uint32_t GNUNET_MESH_ApplicationType;
128 * Connect to the mesh service.
130 * @param cfg configuration to use
131 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
132 * @param cleaner function called when an *inbound* tunnel is destroyed
133 * @param handlers callbacks for messages we care about, NULL-terminated
134 * note that the mesh is allowed to drop notifications about inbound
135 * messages if the client does not process them fast enough (for this
136 * notification type, a bounded queue is used)
137 * @param stypes Application Types the client claims to offer
138 * @return handle to the mesh service
139 * NULL on error (in this case, init is never called)
141 struct GNUNET_MESH_Handle *
142 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls,
143 GNUNET_MESH_TunnelEndHandler cleaner,
144 const struct GNUNET_MESH_MessageHandler *handlers,
145 const GNUNET_MESH_ApplicationType *stypes);
148 * Get the peer on the other side of this tunnel if it is just one. Return NULL otherwise
150 * @param tunnel the tunnel
151 * @return the peer or NULL
153 const struct GNUNET_PeerIdentity *
154 GNUNET_MESH_get_peer (const struct GNUNET_MESH_Tunnel *tunnel);
158 * Disconnect from the mesh service.
160 * @param handle connection to mesh to disconnect
163 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle);
170 * Method called whenever a tunnel falls apart.
173 * @param peer peer identity the tunnel stopped working with
175 typedef void (*GNUNET_MESH_TunnelDisconnectHandler) (void *cls,
177 GNUNET_PeerIdentity *
182 * Method called whenever a tunnel is established.
185 * @param peer peer identity the tunnel was created to, NULL on timeout
186 * @param atsi performance data for the connection
188 typedef void (*GNUNET_MESH_TunnelConnectHandler) (void *cls,
190 GNUNET_PeerIdentity * peer,
192 GNUNET_ATS_Information
198 * Handle for a request to the mesh to connect or disconnect
199 * from a particular peer. Can be used to cancel the request
200 * (before the 'cont'inuation is called).
202 struct GNUNET_MESH_PeerRequestHandle;
206 * Request that the mesh should try to connect to any of the given peers.
208 * @param h mesh handle
209 * @param timeout how long to try to establish a connection
210 * @param num_peers length of the peers array
211 * @param peers list of candidates to connect to
212 * @param connect_handler function to call on successful connect (or timeout)
213 * @param disconnect_handler function to call on disconnect
214 * @param handler_cls closure for handler
215 * @return NULL on error (handler will not be called), otherwise handle for cancellation
217 struct GNUNET_MESH_Tunnel *
218 GNUNET_MESH_peer_request_connect_any (struct GNUNET_MESH_Handle *h,
219 struct GNUNET_TIME_Relative timeout,
220 unsigned int num_peers,
221 const struct GNUNET_PeerIdentity *peers,
222 GNUNET_MESH_TunnelConnectHandler
224 GNUNET_MESH_TunnelDisconnectHandler
225 disconnect_handler, void *handler_cls);
229 * Request that the mesh should try to connect to all of the given peers.
230 * Messages send to the tunnel will be broadcast.
232 * @param h mesh handle
233 * @param timeout how long to try to establish a connection
234 * @param num_peers length of the peers array
235 * @param peers list of candidates to connect to
236 * @param connect_handler function to call on successful connect (or timeout);
237 * will be called for EACH of the peers in the list and
238 * once at the end with 'NULL' on timeout or once we've connected
239 * to each of the peers in the list
240 * @param disconnect_handler function called if a peer drops out of the tunnel;
241 * the mesh will NOT try to add it back automatically
242 * @param handler_cls closure for handler
243 * @return NULL on error (handler will not be called), otherwise handle for cancellation
245 struct GNUNET_MESH_Tunnel *
246 GNUNET_MESH_peer_request_connect_all (struct GNUNET_MESH_Handle *h,
247 struct GNUNET_TIME_Relative timeout,
248 unsigned int num_peers,
249 const struct GNUNET_PeerIdentity *peers,
250 GNUNET_MESH_TunnelConnectHandler
252 GNUNET_MESH_TunnelDisconnectHandler
253 disconnect_handler, void *handler_cls);
257 * Request that a peer should be added to the tunnel. The existing
258 * connect handler will be called ONCE with either success or failure.
260 * @param tunnel handle to existing tunnel
261 * @param timeout how long to try to establish a connection
262 * @param peer peer to add
265 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
266 struct GNUNET_TIME_Relative timeout,
267 const struct GNUNET_PeerIdentity *peer);
271 * Request that a peer should be removed from the tunnel. The existing
272 * disconnect handler will be called ONCE if we were connected.
274 * @param tunnel handle to existing tunnel
275 * @param peer peer to remove
278 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
279 const struct GNUNET_PeerIdentity *peer);
283 * Request that the mesh should try to connect to a peer supporting the given
286 * @param h mesh handle
287 * @param timeout how long to try to establish a connection
288 * @param app_type application type that must be supported by the peer (MESH should
289 * discover peer in proximity handling this type)
290 * @param connect_handler function to call on successful connect (or timeout);
291 * will be called for EACH of the peers in the list and
292 * once at the end with 'NULL' on timeout or once we've connected
293 * to each of the peers in the list
294 * @param disconnect_handler function called if a peer drops out of the tunnel;
295 * the mesh will NOT try to add it back automatically
296 * @param handler_cls closure for handler
297 * @return NULL on error (handler will not be called), otherwise handle for cancellation
299 struct GNUNET_MESH_Tunnel *
300 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Handle *h,
301 struct GNUNET_TIME_Relative timeout,
302 GNUNET_MESH_ApplicationType app_type,
303 GNUNET_MESH_TunnelConnectHandler
305 GNUNET_MESH_TunnelDisconnectHandler
311 * Cancel a pending request to connect to a particular peer. Destroys the
314 * @param req request handle that was returned for the original request
317 GNUNET_MESH_peer_request_connect_cancel (struct GNUNET_MESH_Tunnel *req);
321 * Handle for a transmission request.
323 struct GNUNET_MESH_TransmitHandle;
327 * Ask the mesh to call "notify" once it is ready to transmit the
328 * given number of bytes to the specified "target". If we are not yet
329 * connected to the specified peer, a call to this function will cause
330 * us to try to establish a connection.
332 * @param tunnel tunnel to use for transmission
333 * @param cork is corking allowed for this transmission?
334 * @param priority how important is the message?
335 * @param maxdelay how long can the message wait?
336 * @param target destination for the message, NULL for multicast to all tunnel targets
337 * @param notify_size how many bytes of buffer space does notify want?
338 * @param notify function to call when buffer space is available;
339 * will be called with NULL on timeout or if the overall queue
340 * for this peer is larger than queue_size and this is currently
341 * the message with the lowest priority
342 * @param notify_cls closure for notify
343 * @return non-NULL if the notify callback was queued,
344 * NULL if we can not even queue the request (insufficient
345 * memory); if NULL is returned, "notify" will NOT be called.
347 struct GNUNET_MESH_TransmitHandle *
348 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
350 struct GNUNET_TIME_Relative maxdelay,
351 const struct GNUNET_PeerIdentity *target,
353 GNUNET_CONNECTION_TransmitReadyNotify notify,
358 * Cancel the specified transmission-ready notification.
360 * @param th handle that was returned by "notify_transmit_ready".
363 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle
367 GNUNET_MESH_tunnel_set_head (struct GNUNET_MESH_Tunnel *tunnel, void *head);
369 GNUNET_MESH_tunnel_set_tail (struct GNUNET_MESH_Tunnel *tunnel, void *tail);
371 GNUNET_MESH_tunnel_get_head (struct GNUNET_MESH_Tunnel *tunnel);
373 GNUNET_MESH_tunnel_get_tail (struct GNUNET_MESH_Tunnel *tunnel);
376 GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data);
378 GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel);
380 #if 0 /* keep Emacsens' auto-indent happy */
387 /* ifndef GNUNET_MESH_SERVICE_H */
389 /* end of gnunet_mesh_service.h */