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/*
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 sender who sent the message
* @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,
struct GNUNET_MESH_Tunnel * tunnel,
void **tunnel_ctx,
const struct GNUNET_PeerIdentity *
sender,
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);
/**
* Type for an application. Values defined in gnunet_applications.h
*/
typedef uint32_t GNUNET_MESH_ApplicationType;
/**
* 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)
* @param stypes list of the applications that this client claims to provide
* @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,
const
GNUNET_MESH_ApplicationType
*stypes);
/**
* 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);
/**
* Create a new tunnel (we're initiator and will be allowed to add/remove peers
* and to broadcast).
*
* @param h mesh handle
* @param connect_handler function to call when peers are actually connected
* @param disconnect_handler function to call when peers are disconnected
* @param handler_cls closure for connect/disconnect handlers
*/
struct GNUNET_MESH_Tunnel *GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle
*h,
GNUNET_MESH_TunnelConnectHandler
connect_handler,
GNUNET_MESH_TunnelDisconnectHandler
disconnect_handler,
void *handler_cls);
/**
* Destroy an existing tunnel.
*
* @param tun tunnel handle
*/
void GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tun);
/**
* 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 a peer should be removed from the tunnel. The existing
* disconnect handler will be called ONCE if we were connected.
*
* @param tunnel handle to existing tunnel
* @param peer peer to remove
*/
void GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
const struct GNUNET_PeerIdentity
*peer);
/**
* Request that the mesh should try to connect to a peer supporting the given
* message type.
*
* @param tunnel handle to existing tunnel
* @param timeout how long to try to establish a connection
* @param app_type application type that must be supported by the peer
* (MESH should discover peer in proximity handling this type)
*/
void GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel
*tunnel,
struct GNUNET_TIME_Relative
timeout,
GNUNET_MESH_ApplicationType
app_type);
/**
* 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 tunnel or target.
*
* @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 target destination for the message
* NULL for multicast to all tunnel targets
* @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,
const
struct
GNUNET_PeerIdentity
*target,
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 */
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