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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
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 *
77 const struct GNUNET_ATS_Information
82 * Message handler. Each struct specifies how to handle on particular
83 * type of message received.
85 struct GNUNET_MESH_MessageHandler
88 * Function to call for messages of "type".
90 GNUNET_MESH_MessageCallback callback;
93 * Type of the message this handler covers.
98 * Expected size of messages of this type. Use 0 for variable-size.
99 * If non-zero, messages of the given type will be discarded if they
100 * do not have the right size.
102 uint16_t expected_size;
108 * Method called whenever another peer has added us to a tunnel
109 * the other peer initiated.
112 * @param tunnel new handle to the tunnel
113 * @param initiator peer that started the tunnel
114 * @param atsi performance information for the tunnel
115 * @return initial tunnel context for the tunnel
116 * (can be NULL -- that's not an error)
118 typedef void *(GNUNET_MESH_InboundTunnelNotificationHandler) (void *cls,
126 GNUNET_ATS_Information
131 * Function called whenever an inbound tunnel is destroyed. Should clean up
132 * any associated state.
134 * @param cls closure (set from GNUNET_MESH_connect)
135 * @param tunnel connection to the other end (henceforth invalid)
136 * @param tunnel_ctx place where local state associated
137 * with the tunnel is stored
139 typedef void (GNUNET_MESH_TunnelEndHandler) (void *cls,
140 const struct GNUNET_MESH_Tunnel *
141 tunnel, void *tunnel_ctx);
145 * Type for an application. Values defined in gnunet_applications.h
147 typedef uint32_t GNUNET_MESH_ApplicationType;
151 * Connect to the mesh service.
153 * @param cfg configuration to use
154 * @param queue_size size of the data message queue, shared among all tunnels
155 * (each tunnel is guaranteed to accept at least one message,
156 * no matter what is the status of other tunnels)
157 * @param cls closure for the various callbacks that follow
158 * (including handlers in the handlers array)
159 * @param new_tunnel function called when an *inbound* tunnel is created
160 * @param cleaner function called when an *inbound* tunnel is destroyed
161 * @param handlers callbacks for messages we care about, NULL-terminated
162 * note that the mesh is allowed to drop notifications about
163 * inbound messages if the client does not process them fast
164 * enough (for this notification type, a bounded queue is used)
165 * @param stypes list of the applications that this client claims to provide
166 * @return handle to the mesh service NULL on error
167 * (in this case, init is never called)
169 struct GNUNET_MESH_Handle *
170 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
171 unsigned int queue_size, void *cls,
172 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
173 GNUNET_MESH_TunnelEndHandler cleaner,
174 const struct GNUNET_MESH_MessageHandler *handlers,
175 const GNUNET_MESH_ApplicationType *stypes);
179 * Disconnect from the mesh service.
181 * @param handle connection to mesh to disconnect
184 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle);
188 * Method called whenever a peer has disconnected from the tunnel.
189 * Implementations of this callback must NOT call
190 * GNUNET_MESH_tunnel_destroy immediately, but instead schedule those
191 * to run in some other task later. However, calling
192 * "GNUNET_MESH_notify_transmit_ready_cancel" is allowed.
195 * @param peer peer identity the tunnel stopped working with
197 typedef void (*GNUNET_MESH_PeerDisconnectHandler) (void *cls,
199 GNUNET_PeerIdentity * peer);
203 * Method called whenever a peer has connected to the tunnel.
206 * @param peer peer identity the tunnel was created to, NULL on timeout
207 * @param atsi performance data for the connection
209 * TODO: change to return int to let client allow the new peer or not?
211 typedef void (*GNUNET_MESH_PeerConnectHandler) (void *cls,
212 const struct GNUNET_PeerIdentity
215 GNUNET_ATS_Information * atsi);
220 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
223 * @param h mesh handle
224 * @param tunnel_ctx client's tunnel context to associate with the tunnel
225 * @param connect_handler function to call when peers are actually connected
226 * @param disconnect_handler function to call when peers are disconnected
227 * @param handler_cls closure for connect/disconnect handlers
229 struct GNUNET_MESH_Tunnel *
230 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
231 GNUNET_MESH_PeerConnectHandler connect_handler,
232 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
236 * Destroy an existing tunnel.
238 * @param tunnel tunnel handle
241 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel);
245 * Request that a peer should be added to the tunnel. The connect handler
246 * will be called when the peer connects
248 * @param tunnel handle to existing tunnel
249 * @param peer peer to add
252 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
253 const struct GNUNET_PeerIdentity *peer);
257 * Request that a peer should be removed from the tunnel. The existing
258 * disconnect handler will be called ONCE if we were connected.
260 * @param tunnel handle to existing tunnel
261 * @param peer peer to remove
264 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
265 const struct GNUNET_PeerIdentity *peer);
269 * Request that the mesh should try to connect to a peer supporting the given
272 * @param tunnel handle to existing tunnel
273 * @param app_type application type that must be supported by the peer
274 * (MESH should discover peer in proximity handling this type)
277 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
278 GNUNET_MESH_ApplicationType app_type);
282 * Handle for a transmission request.
284 struct GNUNET_MESH_TransmitHandle;
288 * Ask the mesh to call "notify" once it is ready to transmit the
289 * given number of bytes to the specified tunnel or target.
291 * @param tunnel tunnel to use for transmission
292 * @param cork is corking allowed for this transmission?
293 * @param priority how important is the message?
294 * @param maxdelay how long can the message wait?
295 * @param target destination for the message
296 * NULL for multicast to all tunnel targets
297 * @param notify_size how many bytes of buffer space does notify want?
298 * @param notify function to call when buffer space is available;
299 * will be called with NULL on timeout or if the overall queue
300 * for this peer is larger than queue_size and this is currently
301 * the message with the lowest priority
302 * @param notify_cls closure for notify
303 * @return non-NULL if the notify callback was queued,
304 * NULL if we can not even queue the request (insufficient
305 * memory); if NULL is returned, "notify" will NOT be called.
307 struct GNUNET_MESH_TransmitHandle *
308 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
310 struct GNUNET_TIME_Relative maxdelay,
311 const struct GNUNET_PeerIdentity *target,
313 GNUNET_CONNECTION_TransmitReadyNotify notify,
318 * Cancel the specified transmission-ready notification.
320 * @param th handle that was returned by "notify_transmit_ready".
323 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle
328 * Transition API for tunnel ctx management
331 GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data);
334 * Transition API for tunnel ctx management
337 GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel);
340 #if 0 /* keep Emacsens' auto-indent happy */
347 /* ifndef GNUNET_MESH_SERVICE_H */
349 /* end of gnunet_mesh_service.h */