2 This file is part of GNUnet.
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)
71 (*GNUNET_MESH_MessageCallback) (void *cls,
72 struct GNUNET_MESH_Tunnel *tunnel,
74 const struct GNUNET_PeerIdentity *sender,
75 const struct GNUNET_MessageHeader *message,
76 const struct GNUNET_TRANSPORT_ATS_Information *atsi);
80 * Message handler. Each struct specifies how to handle on particular
81 * type of message received.
83 struct GNUNET_MESH_MessageHandler
86 * Function to call for messages of "type".
88 GNUNET_MESH_MessageCallback callback;
91 * Type of the message this handler covers.
96 * Expected size of messages of this type. Use 0 for variable-size.
97 * If non-zero, messages of the given type will be discarded if they
98 * do not have the right size.
100 uint16_t expected_size;
106 * Function called whenever an inbound tunnel is destroyed. Should clean up
107 * any associated state.
109 * @param cls closure (set from GNUNET_MESH_connect)
110 * @param tunnel connection to the other end (henceforth invalid)
111 * @param tunnel_ctx place where local state associated with the tunnel is stored
113 typedef void (GNUNET_MESH_TunnelEndHandler)(void *cls,
114 const struct GNUNET_MESH_Tunnel *tunnel,
119 * Type for an application. Values defined in gnunet_applications.h
121 typedef uint32_t GNUNET_MESH_ApplicationType;
125 * Connect to the mesh service.
127 * @param cfg configuration to use
128 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
129 * @param cleaner function called when an *inbound* tunnel is destroyed
130 * @param handlers callbacks for messages we care about, NULL-terminated
131 * note that the mesh is allowed to drop notifications about inbound
132 * messages if the client does not process them fast enough (for this
133 * notification type, a bounded queue is used)
134 * @param stypes Application Types the client claims to offer
135 * @return handle to the mesh service
136 * NULL on error (in this case, init is never called)
138 struct GNUNET_MESH_Handle *
139 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
141 GNUNET_MESH_TunnelEndHandler cleaner,
142 const struct GNUNET_MESH_MessageHandler *handlers,
143 const GNUNET_MESH_ApplicationType *stypes);
146 * Get the peer on the other side of this tunnel if it is just one. Return NULL otherwise
148 * @param tunnel the tunnel
149 * @return the peer or NULL
151 const struct GNUNET_PeerIdentity*
152 GNUNET_MESH_get_peer(const struct GNUNET_MESH_Tunnel* tunnel);
156 * Disconnect from the mesh service.
158 * @param handle connection to mesh to disconnect
160 void GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle);
167 * Method called whenever a tunnel falls apart.
170 * @param peer peer identity the tunnel stopped working with
172 typedef void (*GNUNET_MESH_TunnelDisconnectHandler) (void *cls,
173 const struct GNUNET_PeerIdentity *peer);
177 * Method called whenever a tunnel is established.
180 * @param peer peer identity the tunnel was created to, NULL on timeout
181 * @param atsi performance data for the connection
183 typedef void (*GNUNET_MESH_TunnelConnectHandler) (void *cls,
184 const struct GNUNET_PeerIdentity *peer,
185 const struct GNUNET_TRANSPORT_ATS_Information *atsi);
190 * Handle for a request to the mesh to connect or disconnect
191 * from a particular peer. Can be used to cancel the request
192 * (before the 'cont'inuation is called).
194 struct GNUNET_MESH_PeerRequestHandle;
198 * Request that the mesh should try to connect to any of the given peers.
200 * @param h mesh handle
201 * @param timeout how long to try to establish a connection
202 * @param num_peers length of the peers array
203 * @param peers list of candidates to connect to
204 * @param connect_handler function to call on successful connect (or timeout)
205 * @param disconnect_handler function to call on disconnect
206 * @param handler_cls closure for handler
207 * @return NULL on error (handler will not be called), otherwise handle for cancellation
209 struct GNUNET_MESH_Tunnel *
210 GNUNET_MESH_peer_request_connect_any (struct GNUNET_MESH_Handle *h,
211 struct GNUNET_TIME_Relative timeout,
212 unsigned int num_peers,
213 const struct GNUNET_PeerIdentity *peers,
214 GNUNET_MESH_TunnelConnectHandler connect_handler,
215 GNUNET_MESH_TunnelDisconnectHandler disconnect_handler,
220 * Request that the mesh should try to connect to all of the given peers.
221 * Messages send to the tunnel will be broadcast.
223 * @param h mesh handle
224 * @param timeout how long to try to establish a connection
225 * @param num_peers length of the peers array
226 * @param peers list of candidates to connect to
227 * @param connect_handler function to call on successful connect (or timeout);
228 * will be called for EACH of the peers in the list and
229 * once at the end with 'NULL' on timeout or once we've connected
230 * to each of the peers in the list
231 * @param disconnect_handler function called if a peer drops out of the tunnel;
232 * the mesh will NOT try to add it back automatically
233 * @param handler_cls closure for handler
234 * @return NULL on error (handler will not be called), otherwise handle for cancellation
236 struct GNUNET_MESH_Tunnel *
237 GNUNET_MESH_peer_request_connect_all (struct GNUNET_MESH_Handle *h,
238 struct GNUNET_TIME_Relative timeout,
239 unsigned int num_peers,
240 const struct GNUNET_PeerIdentity *peers,
241 GNUNET_MESH_TunnelConnectHandler connect_handler,
242 GNUNET_MESH_TunnelDisconnectHandler disconnect_handler,
247 * Request that a peer should be added to the tunnel. The existing
248 * connect handler will be called ONCE with either success or failure.
250 * @param tunnel handle to existing tunnel
251 * @param timeout how long to try to establish a connection
252 * @param peer peer to add
255 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
256 struct GNUNET_TIME_Relative timeout,
257 const struct GNUNET_PeerIdentity *peer);
261 * Request that a peer should be removed from the tunnel. The existing
262 * disconnect handler will be called ONCE if we were connected.
264 * @param tunnel handle to existing tunnel
265 * @param peer peer to remove
268 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
269 const struct GNUNET_PeerIdentity *peer);
273 * Request that the mesh should try to connect to a peer supporting the given
276 * @param h mesh handle
277 * @param timeout how long to try to establish a connection
278 * @param app_type application type that must be supported by the peer (MESH should
279 * discover peer in proximity handling this type)
280 * @param connect_handler function to call on successful connect (or timeout);
281 * will be called for EACH of the peers in the list and
282 * once at the end with 'NULL' on timeout or once we've connected
283 * to each of the peers in the list
284 * @param disconnect_handler function called if a peer drops out of the tunnel;
285 * the mesh will NOT try to add it back automatically
286 * @param handler_cls closure for handler
287 * @return NULL on error (handler will not be called), otherwise handle for cancellation
289 struct GNUNET_MESH_Tunnel *
290 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Handle *h,
291 struct GNUNET_TIME_Relative timeout,
292 GNUNET_MESH_ApplicationType app_type,
293 GNUNET_MESH_TunnelConnectHandler connect_handler,
294 GNUNET_MESH_TunnelDisconnectHandler disconnect_handler,
299 * Cancel a pending request to connect to a particular peer. Destroys the
302 * @param req request handle that was returned for the original request
305 GNUNET_MESH_peer_request_connect_cancel (struct GNUNET_MESH_Tunnel *req);
309 * Handle for a transmission request.
311 struct GNUNET_MESH_TransmitHandle;
315 * Ask the mesh to call "notify" once it is ready to transmit the
316 * given number of bytes to the specified "target". If we are not yet
317 * connected to the specified peer, a call to this function will cause
318 * us to try to establish a connection.
320 * @param tunnel tunnel to use for transmission
321 * @param cork is corking allowed for this transmission?
322 * @param priority how important is the message?
323 * @param maxdelay how long can the message wait?
324 * @param target destination for the message, NULL for multicast to all tunnel targets
325 * @param notify_size how many bytes of buffer space does notify want?
326 * @param notify function to call when buffer space is available;
327 * will be called with NULL on timeout or if the overall queue
328 * for this peer is larger than queue_size and this is currently
329 * the message with the lowest priority
330 * @param notify_cls closure for notify
331 * @return non-NULL if the notify callback was queued,
332 * NULL if we can not even queue the request (insufficient
333 * memory); if NULL is returned, "notify" will NOT be called.
335 struct GNUNET_MESH_TransmitHandle *
336 GNUNET_MESH_notify_transmit_ready (struct
344 const struct GNUNET_PeerIdentity *target,
347 GNUNET_CONNECTION_TransmitReadyNotify
354 * Cancel the specified transmission-ready notification.
356 * @param th handle that was returned by "notify_transmit_ready".
359 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle
362 void GNUNET_MESH_tunnel_set_head(struct GNUNET_MESH_Tunnel* tunnel, void* head);
363 void GNUNET_MESH_tunnel_set_tail(struct GNUNET_MESH_Tunnel* tunnel, void* tail);
364 void* GNUNET_MESH_tunnel_get_head(struct GNUNET_MESH_Tunnel* tunnel);
365 void* GNUNET_MESH_tunnel_get_tail(struct GNUNET_MESH_Tunnel* tunnel);
367 void GNUNET_MESH_tunnel_set_data(struct GNUNET_MESH_Tunnel* tunnel, void* data);
368 void* GNUNET_MESH_tunnel_get_data(struct GNUNET_MESH_Tunnel* tunnel);
370 #if 0 /* keep Emacsens' auto-indent happy */
377 /* ifndef GNUNET_MESH_SERVICE_H */
379 /* end of gnunet_mesh_service.h */