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/*
This file is part of GNUnet.
(C) 2007, 2008, 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_nat_lib.h
* @brief Library handling UPnP and NAT-PMP port forwarding and
* external IP address retrieval
*
* @author Milan Bouchet-Valat
*/
#ifndef GNUNET_NAT_LIB_H
#define GNUNET_NAT_LIB_H
#include "gnunet_util_lib.h"
/**
* Signature of the callback passed to GNUNET_NAT_register.
*
* @param cls closure
* @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
* the previous (now invalid) one
* @param addr either the previous or the new public IP address
* @param addrlen actual lenght of the address
*/
typedef void (*GNUNET_NAT_AddressCallback) (void *cls,
int add_remove,
const struct sockaddr *addr,
socklen_t addrlen);
/**
* Handle for active NAT registrations.
*/
struct GNUNET_NAT_Handle;
/**
* Attempt to enable port redirection and detect public IP address contacting
* UPnP or NAT-PMP routers on the local network. Use addr to specify to which
* of the local host's addresses should the external port be mapped. The port
* is taken from the corresponding sockaddr_in[6] field.
*
* @param addr the local address packets should be redirected to
* @param addrlen actual lenght of the address
* @param callback function to call everytime the public IP address changes
* @param callback_cls closure for callback
* @return NULL on error, otherwise handle that can be used to unregister
*/
struct GNUNET_NAT_Handle *
GNUNET_NAT_register (const struct sockaddr *addr,
socklen_t addrlen,
GNUNET_NAT_AddressCallback callback,
void *callback_cls);
/**
* Stop port redirection and public IP address detection for the given handle.
* This frees the handle, after having sent the needed commands to close open ports.
*
* @param h the handle to stop
*/
void GNUNET_NAT_unregister (struct GNUNET_NAT_Handle *h);
#endif
/* end of gnunet_nat_lib.h */
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