viva vpn

1 files changed, 339 insertions, 0 deletions

diff --git a/src/include/gnunet_mesh_service.h b/src/include/gnunet_mesh_service.h
new file mode 100644
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+++ b/src/include/gnunet_mesh_service.h
@@ -0,0 +1,339 @@
+/*
+     This file is part of GNUnet.
+     (C) 2009, 2010 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file include/gnunet_mesh_service.h
+ * @brief mesh service; establish tunnels to distant peers
+ * @author Christian Grothoff
+ */
+
+#ifndef GNUNET_MESH_SERVICE_H
+#define GNUNET_MESH_SERVICE_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#if 0                           /* keep Emacsens' auto-indent happy */
+}
+#endif
+#endif
+
+#include "gnunet_util_lib.h"
+#include "gnunet_transport_service.h"
+
+/**
+ * Version number of GNUnet-mesh API.
+ */
+#define GNUNET_MESH_VERSION 0x00000000
+
+
+/**
+ * Opaque handle to the service.
+ */
+struct GNUNET_MESH_Handle;
+
+/**
+ * Opaque handle to a tunnel.
+ */
+struct GNUNET_MESH_Tunnel;
+
+/**
+ * Functions with this signature are called whenever a message is
+ * received or transmitted.
+ *
+ * @param cls closure (set from GNUNET_MESH_connect)
+ * @param tunnel connection to the other end
+ * @param tunnel_ctx place to store local state associated with the tunnel
+ * @param message the actual message
+ * @param atsi performance data for the connection
+ * @return GNUNET_OK to keep the connection open,
+ *         GNUNET_SYSERR to close it (signal serious error)
+ */
+typedef int
+  (*GNUNET_MESH_MessageCallback) (void *cls,
+                                  const struct GNUNET_MESH_Tunnel *tunnel,
+                                  void **tunnel_ctx,
+                                  const struct GNUNET_MessageHeader *message,
+                                  const struct GNUNET_TRANSPORT_ATS_Information *atsi);
+
+
+/**
+ * Message handler.  Each struct specifies how to handle on particular
+ * type of message received.
+ */
+struct GNUNET_MESH_MessageHandler
+{
+  /**
+   * Function to call for messages of "type".
+   */
+  GNUNET_MESH_MessageCallback callback;
+
+  /**
+   * Type of the message this handler covers.
+   */
+  uint16_t type;
+
+  /**
+   * Expected size of messages of this type.  Use 0 for variable-size.
+   * If non-zero, messages of the given type will be discarded if they
+   * do not have the right size.
+   */
+  uint16_t expected_size;
+
+};
+
+
+/**
+ * Function called whenever an inbound tunnel is destroyed.  Should clean up
+ * any associated state.
+ *
+ * @param cls closure (set from GNUNET_MESH_connect)
+ * @param tunnel connection to the other end (henceforth invalid)
+ * @param tunnel_ctx place where local state associated with the tunnel is stored
+ */
+typedef void (GNUNET_MESH_TunnelEndHandler)(void *cls,
+                                            const struct GNUNET_MESH_Tunnel *tunnel,
+                                            void **tunnel_ctx);
+
+
+/**
+ * Connect to the mesh service.  
+ *
+ * @param cfg configuration to use
+ * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
+ * @param cleaner function called when an *inbound* tunnel is destroyed
+ * @param handlers callbacks for messages we care about, NULL-terminated
+ *                note that the mesh is allowed to drop notifications about inbound
+ *                messages if the client does not process them fast enough (for this
+ *                notification type, a bounded queue is used)
+ * @return handle to the mesh service 
+ *           NULL on error (in this case, init is never called)
+ */
+struct GNUNET_MESH_Handle *
+GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
+                     void *cls,
+                     GNUNET_MESH_TunnelEndHandler cleaner,
+                     const struct GNUNET_MESH_MessageHandler *handlers);
+
+
+/**
+ * Disconnect from the mesh service.
+ *
+ * @param handle connection to mesh to disconnect
+ */
+void GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle);
+
+
+
+
+
+/**
+ * Method called whenever a tunnel falls apart.
+ *
+ * @param cls closure
+ * @param peer peer identity the tunnel stopped working with
+ */
+typedef void (*GNUNET_MESH_TunnelDisconnectHandler) (void *cls,
+                                                     const struct GNUNET_PeerIdentity *peer);
+
+
+/**
+ * Method called whenever a tunnel is established.
+ *
+ * @param cls closure
+ * @param peer peer identity the tunnel was created to, NULL on timeout
+ * @param atsi performance data for the connection
+ */
+typedef void (*GNUNET_MESH_TunnelConnectHandler) (void *cls,
+                                                  const struct GNUNET_PeerIdentity *peer,
+                                                  const struct GNUNET_TRANSPORT_ATS_Information *atsi);
+
+
+
+/**
+ * Handle for a request to the mesh to connect or disconnect
+ * from a particular peer.  Can be used to cancel the request
+ * (before the 'cont'inuation is called).
+ */
+struct GNUNET_MESH_PeerRequestHandle;
+
+
+/**
+ * Request that the mesh should try to connect to any of the given peers.
+ *
+ * @param h mesh handle
+ * @param timeout how long to try to establish a connection
+ * @param num_peers length of the peers arrray
+ * @param peers list of candidates to connect to
+ * @param connect_handler function to call on successful connect (or timeout)
+ * @param disconnect_handler function to call on disconnect
+ * @param handler_cls closure for handler
+ * @return NULL on error (handler will not be called), otherwise handle for cancellation
+ */
+struct GNUNET_MESH_Tunnel *
+GNUNET_MESH_peer_request_connect_any (struct GNUNET_MESH_Handle *h,
+                                      struct GNUNET_TIME_Relative timeout,
+                                      unsigned int num_peers,
+                                      const struct GNUNET_PeerIdentity *peers,
+                                      GNUNET_MESH_TunnelConnectHandler connect_handler,
+                                      GNUNET_MESH_TunnelDisconnectHandler disconnect_handler,
+                                      void *handler_cls);
+
+
+/**
+ * Request that the mesh should try to connect to all of the given peers.
+ * Messages send to the tunnel will be broadcast.
+ *
+ * @param h mesh handle
+ * @param timeout how long to try to establish a connection
+ * @param num_peers length of the peers arrray
+ * @param peers list of candidates to connect to
+ * @param connect_handler function to call on successful connect (or timeout);
+ *                will be called for EACH of the peers in the list and
+ *                once at the end with 'NULL' on timeout or once we've connected
+ *                to each of the peers in the list
+ * @param disconnect_handler function called if a peer drops out of the tunnel;
+ *                the mesh will NOT try to add it back automatically
+ * @param handler_cls closure for handler
+ * @return NULL on error (handler will not be called), otherwise handle for cancellation
+ */
+struct GNUNET_MESH_Tunnel *
+GNUNET_MESH_peer_request_connect_all (struct GNUNET_MESH_Handle *h,
+                                      struct GNUNET_TIME_Relative timeout,
+                                      unsigned int num_peers,
+                                      const struct GNUNET_PeerIdentity *peers,
+                                      GNUNET_MESH_TunnelConnectHandler connect_handler,
+                                      GNUNET_MESH_TunnelDisconnectHandler disconnect_handler,
+                                      void *handler_cls);
+
+
+/**
+ * Request that a peer should be added to the tunnel.  The existing
+ * connect handler will be called ONCE with either success or failure.
+ *
+ * @param tunnel handle to existing tunnel
+ * @param timeout how long to try to establish a connection
+ * @param peer peer to add
+ */
+void
+GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
+                                      struct GNUNET_TIME_Relative timeout,
+                                      const struct GNUNET_PeerIdentity *peer);
+
+
+/**
+ * Request that the mesh should try to connect to a peer supporting the given
+ * message type.
+ *
+ * @param h mesh handle
+ * @param timeout how long to try to establish a connection
+ * @param message_type message type that must be supported by the peer (MESH should
+ *                discover peer in proximity handling this type)
+ * @param connect_handler function to call on successful connect (or timeout);
+ *                will be called for EACH of the peers in the list and
+ *                once at the end with 'NULL' on timeout or once we've connected
+ *                to each of the peers in the list
+ * @param disconnect_handler function called if a peer drops out of the tunnel;
+ *                the mesh will NOT try to add it back automatically
+ * @param handler_cls closure for handler
+ * @return NULL on error (handler will not be called), otherwise handle for cancellation
+ */
+struct GNUNET_MESH_Tunnel *
+GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Handle *h,
+                                          struct GNUNET_TIME_Relative timeout,
+                                          uint16_t message_type,
+                                          GNUNET_MESH_TunnelConnectHandler connect_handler,
+                                          GNUNET_MESH_TunnelDisconnectHandler disconnect_handler,
+                                          void *handler_cls);
+
+
+/**
+ * Cancel a pending request to connect to a particular peer.  Destroys the
+ * tunnel. 
+ *
+ * @param req request handle that was returned for the original request
+ */
+void
+GNUNET_MESH_peer_request_connect_cancel (struct GNUNET_MESH_Tunnel *req);
+
+
+/**
+ * Handle for a transmission request.
+ */
+struct GNUNET_MESH_TransmitHandle;
+
+
+/**
+ * Ask the mesh to call "notify" once it is ready to transmit the
+ * given number of bytes to the specified "target".  If we are not yet
+ * connected to the specified peer, a call to this function will cause
+ * us to try to establish a connection.
+ *
+ * @param tunnel tunnel to use for transmission
+ * @param cork is corking allowed for this transmission?
+ * @param priority how important is the message?
+ * @param maxdelay how long can the message wait?
+ * @param notify_size how many bytes of buffer space does notify want?
+ * @param notify function to call when buffer space is available;
+ *        will be called with NULL on timeout or if the overall queue
+ *        for this peer is larger than queue_size and this is currently
+ *        the message with the lowest priority
+ * @param notify_cls closure for notify
+ * @return non-NULL if the notify callback was queued,
+ *         NULL if we can not even queue the request (insufficient
+ *         memory); if NULL is returned, "notify" will NOT be called.
+ */
+struct GNUNET_MESH_TransmitHandle *
+GNUNET_MESH_notify_transmit_ready (struct
+                                   GNUNET_MESH_Tunnel
+                                   *tunnel,
+                                   int cork,
+                                   uint32_t priority,
+                                   struct
+                                   GNUNET_TIME_Relative
+                                   maxdelay,
+                                   size_t
+                                   notify_size,
+                                   GNUNET_CONNECTION_TransmitReadyNotify
+                                   notify,
+                                   void
+                                   *notify_cls);
+
+
+/**
+ * Cancel the specified transmission-ready notification.
+ *
+ * @param th handle that was returned by "notify_transmit_ready".
+ */
+void
+GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle
+                                          *th);
+
+
+#if 0                           /* keep Emacsens' auto-indent happy */
+{
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+/* ifndef GNUNET_MESH_SERVICE_H */
+#endif
+/* end of gnunet_mesh_service.h */