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/*
This file is part of GNUnet.
Copyright (C) 2009, 2010, 2011, 2016 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file nat/gnunet-service-nat_helper.h
* @brief runs the gnunet-helper-nat-server
* @author Milan Bouchet-Valat
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
/**
* Information we keep per NAT helper process.
*/
struct HelperContext;
/**
* Function called whenever we get a connection reversal
* request from another peer.
*
* @param cls closure
* @param ra IP address of the peer who wants us to connect to it
*/
typedef void
(*GN_ReversalCallback) (void *cls,
const struct sockaddr_in *ra);
/**
* Start the gnunet-helper-nat-server and process incoming
* requests.
*
* @param internal_address
* @param cb function to call if we receive a request
* @param cb_cls closure for @a cb
* @param cfg handle to the GNUnet configuration
* @return NULL on error
*/
struct HelperContext *
GN_start_gnunet_nat_server_ (const struct in_addr *internal_address,
GN_ReversalCallback cb,
void *cb_cls,
const struct GNUNET_CONFIGURATION_Handle *cfg);
/**
* Start the gnunet-helper-nat-server and process incoming
* requests.
*
* @param h helper context to stop
*/
void
GN_stop_gnunet_nat_server_ (struct HelperContext *h);
/**
* We want to connect to a peer that is behind NAT. Run the
* gnunet-helper-nat-client to send dummy ICMP responses to cause
* that peer to connect to us (connection reversal).
*
* @param internal_address out internal address to use
* @param internal_port internal port to use
* @param remote_v4 the address of the peer (IPv4-only)
* @param cfg handle to the GNUnet configuration
* @return #GNUNET_SYSERR on error,
* #GNUNET_OK otherwise
*/
int
GN_request_connection_reversal (const struct in_addr *internal_address,
uint16_t internal_port,
const struct in_addr *remote_v4,
const struct GNUNET_CONFIGURATION_Handle *cfg);
/* end of gnunet-service-nat_helper.h */
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