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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_TRANSPORT_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
115 * with the tunnel is stored
117 typedef void (GNUNET_MESH_TunnelEndHandler) (void *cls,
118 const struct GNUNET_MESH_Tunnel *
119 tunnel, void **tunnel_ctx);
123 * Type for an application. Values defined in gnunet_applications.h
125 typedef uint32_t GNUNET_MESH_ApplicationType;
129 * Connect to the mesh service.
131 * @param cfg configuration to use
132 * @param cls closure for the various callbacks that follow
133 * (including handlers in the handlers array)
134 * @param cleaner function called when an *inbound* tunnel is destroyed
135 * @param handlers callbacks for messages we care about, NULL-terminated
136 * note that the mesh is allowed to drop notifications about
137 * inbound messages if the client does not process them fast
138 * enough (for this notification type, a bounded queue is used)
139 * @param stypes list of the applications that this client claims to provide
140 * @return handle to the mesh service NULL on error
141 * (in this case, init is never called)
143 struct GNUNET_MESH_Handle *
144 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls,
145 GNUNET_MESH_TunnelEndHandler cleaner,
146 const struct GNUNET_MESH_MessageHandler *handlers,
147 const GNUNET_MESH_ApplicationType *stypes);
151 * Disconnect from the mesh service.
153 * @param handle connection to mesh to disconnect
156 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle);
160 * Method called whenever a tunnel falls apart.
163 * @param peer peer identity the tunnel stopped working with
165 typedef void (*GNUNET_MESH_TunnelDisconnectHandler) (void *cls,
167 GNUNET_PeerIdentity *
172 * Method called whenever a tunnel is established.
175 * @param peer peer identity the tunnel was created to, NULL on timeout
176 * @param atsi performance data for the connection
178 typedef void (*GNUNET_MESH_TunnelConnectHandler) (void *cls,
180 GNUNET_PeerIdentity * peer,
182 GNUNET_TRANSPORT_ATS_Information
188 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
191 * @param h mesh handle
192 * @param connect_handler function to call when peers are actually connected
193 * @param disconnect_handler function to call when peers are disconnected
194 * @param handler_cls closure for connect/disconnect handlers
196 struct GNUNET_MESH_Tunnel *
197 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h,
198 GNUNET_MESH_TunnelConnectHandler connect_handler,
199 GNUNET_MESH_TunnelDisconnectHandler
200 disconnect_handler, void *handler_cls);
203 * Destroy an existing tunnel.
205 * @param tun tunnel handle
208 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tun);
212 * Request that a peer should be added to the tunnel. The existing
213 * connect handler will be called ONCE with either success or failure.
215 * @param tunnel handle to existing tunnel
216 * @param timeout how long to try to establish a connection
217 * @param peer peer to add
220 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
221 struct GNUNET_TIME_Relative timeout,
222 const struct GNUNET_PeerIdentity *peer);
226 * Request that a peer should be removed from the tunnel. The existing
227 * disconnect handler will be called ONCE if we were connected.
229 * @param tunnel handle to existing tunnel
230 * @param peer peer to remove
233 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
234 const struct GNUNET_PeerIdentity *peer);
238 * Request that the mesh should try to connect to a peer supporting the given
241 * @param tunnel handle to existing tunnel
242 * @param timeout how long to try to establish a connection
243 * @param app_type application type that must be supported by the peer
244 * (MESH should discover peer in proximity handling this type)
247 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
248 struct GNUNET_TIME_Relative timeout,
249 GNUNET_MESH_ApplicationType app_type);
253 * Handle for a transmission request.
255 struct GNUNET_MESH_TransmitHandle;
259 * Ask the mesh to call "notify" once it is ready to transmit the
260 * given number of bytes to the specified tunnel or target.
262 * @param tunnel tunnel to use for transmission
263 * @param cork is corking allowed for this transmission?
264 * @param priority how important is the message?
265 * @param maxdelay how long can the message wait?
266 * @param target destination for the message
267 * NULL for multicast to all tunnel targets
268 * @param notify_size how many bytes of buffer space does notify want?
269 * @param notify function to call when buffer space is available;
270 * will be called with NULL on timeout or if the overall queue
271 * for this peer is larger than queue_size and this is currently
272 * the message with the lowest priority
273 * @param notify_cls closure for notify
274 * @return non-NULL if the notify callback was queued,
275 * NULL if we can not even queue the request (insufficient
276 * memory); if NULL is returned, "notify" will NOT be called.
278 struct GNUNET_MESH_TransmitHandle *
279 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
281 struct GNUNET_TIME_Relative maxdelay,
282 const struct GNUNET_PeerIdentity *target,
284 GNUNET_CONNECTION_TransmitReadyNotify notify,
289 * Cancel the specified transmission-ready notification.
291 * @param th handle that was returned by "notify_transmit_ready".
294 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle
298 #if 0 /* keep Emacsens' auto-indent happy */
305 /* ifndef GNUNET_MESH_SERVICE_H */
307 /* end of gnunet_mesh_service.h */