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/*
This file is part of GNUnet.
Copyright (C) 2001-2017 GNUnet e.V.
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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file cadet/gnunet-service-cadet-new_connection.h
* @brief
* @author Bartlomiej Polot
* @author Christian Grothoff
*/
#ifndef GNUNET_SERVICE_CADET_CONNECTION_H
#define GNUNET_SERVICE_CADET_CONNECTION_H
#include "gnunet_util_lib.h"
#include "gnunet-service-cadet-new.h"
#include "gnunet-service-cadet-new_peer.h"
#include "cadet_protocol.h"
/**
* Function called to notify tunnel about change in our readyness.
*
* @param cls closure
* @param is_ready #GNUNET_YES if the connection is now ready for transmission,
* #GNUNET_NO if the connection is no longer ready for transmission
*/
typedef void
(*GCC_ReadyCallback)(void *cls,
int is_ready);
/**
* Destroy a connection, called when the CORE layer is already done
* (i.e. has received a BROKEN message), but if we still have to
* communicate the destruction of the connection to the tunnel (if one
* exists).
*
* @param cc connection to destroy
*/
void
GCC_destroy_without_core (struct CadetConnection *cc);
/**
* Destroy a connection, called if the tunnel association with the
* connection was already broken, but we still need to notify the CORE
* layer about the breakage.
*
* @param cc connection to destroy
*/
void
GCC_destroy_without_tunnel (struct CadetConnection *cc);
/**
* Create a connection to @a destination via @a path and
* notify @a cb whenever we are ready for more data.
*
* @param destination where to go
* @param path which path to take (may not be the full path)
* @param ct which tunnel uses this connection
* @param ready_cb function to call when ready to transmit
* @param ready_cb_cls closure for @a cb
* @return handle to the connection
*/
struct CadetConnection *
GCC_create (struct CadetPeer *destination,
struct CadetPeerPath *path,
struct CadetTConnection *ct,
GCC_ReadyCallback ready_cb,
void *ready_cb_cls);
/**
* Create a connection to @a destination via @a path and
* notify @a cb whenever we are ready for more data. This
* is an inbound tunnel, so we must use the existing @a cid
*
* @param destination where to go
* @param path which path to take (may not be the full path)
* @param ct which tunnel uses this connection
* @param ready_cb function to call when ready to transmit
* @param ready_cb_cls closure for @a cb
* @return handle to the connection, NULL if we already have
* a connection that takes precedence on @a path
*/
struct CadetConnection *
GCC_create_inbound (struct CadetPeer *destination,
struct CadetPeerPath *path,
struct CadetTConnection *ct,
const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid,
GCC_ReadyCallback ready_cb,
void *ready_cb_cls);
/**
* Transmit message @a msg via connection @a cc. Must only be called
* (once) after the connection has signalled that it is ready via the
* `ready_cb`. Clients can also use #GCC_is_ready() to check if the
* connection is right now ready for transmission.
*
* @param cc connection identification
* @param env envelope with message to transmit;
* the #GNUNET_MQ_notify_send() must not have yet been used
* for the envelope. Also, the message better match the
* connection identifier of this connection...
*/
void
GCC_transmit (struct CadetConnection *cc,
struct GNUNET_MQ_Envelope *env);
/**
* A CREATE_ACK was received for this connection, process it.
*
* @param cc the connection that got the ACK.
*/
void
GCC_handle_connection_create_ack (struct CadetConnection *cc);
/**
* We got a #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE for a
* connection that we already have. Either our ACK got lost
* or something is fishy. Consider retransmitting the ACK.
*
* @param cc connection that got the duplicate CREATE
*/
void
GCC_handle_duplicate_create (struct CadetConnection *cc);
/**
* Handle KX message.
*
* @param cc connection that received encrypted message
* @param msg the key exchange message
*/
void
GCC_handle_kx (struct CadetConnection *cc,
const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg);
/**
* Handle encrypted message.
*
* @param cc connection that received encrypted message
* @param msg the encrypted message to decrypt
*/
void
GCC_handle_encrypted (struct CadetConnection *cc,
const struct GNUNET_CADET_TunnelEncryptedMessage *msg);
/**
* Return the tunnel associated with this connection.
*
* @param cc connection to query
* @return corresponding entry in the tunnel's connection list
*/
struct CadetTConnection *
GCC_get_ct (struct CadetConnection *cc);
/**
* Obtain the path used by this connection.
*
* @param cc connection
* @return path to @a cc
*/
struct CadetPeerPath *
GCC_get_path (struct CadetConnection *cc);
/**
* Obtain unique ID for the connection.
*
* @param cc connection.
* @return unique number of the connection
*/
const struct GNUNET_CADET_ConnectionTunnelIdentifier *
GCC_get_id (struct CadetConnection *cc);
/**
* Get a (static) string for a connection.
*
* @param cc Connection.
*/
const char *
GCC_2s (const struct CadetConnection *cc);
/**
* Log connection info.
*
* @param cc connection
* @param level Debug level to use.
*/
void
GCC_debug (struct CadetConnection *cc,
enum GNUNET_ErrorType level);
#endif
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