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/*
This file is part of GNUnet.
Copyright (C) 2009, 2015, 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/>.
*/
/**
* This code provides some support for doing STUN transactions. We
* receive the simplest possible packet as the STUN server and try
* to respond properly.
*
* All STUN packets start with a simple header made of a type,
* length (excluding the header) and a 16-byte random transaction id.
* Following the header we may have zero or more attributes, each
* structured as a type, length and a value (whose format depends
* on the type, but often contains addresses).
* Of course all fields are in network format.
*
* This code was based on ministun.c.
*
* @file nat/gnunet-service-nat_stun.h
* @brief Functions for STUN functionality
* @author Bruno Souza Cabral
*/
#ifndef GNUNET_SERVICE_NAT_STUN_H
#define GNUNET_SERVICE_NAT_STUN_H
#include "platform.h"
/**
* Handle an incoming STUN response. Do some basic sanity checks on
* packet size and content, try to extract information.
* At the moment this only processes BIND requests,
* and returns the externally visible address of the original
* request.
*
* @param data the packet
* @param len the length of the packet in @a data
* @param[out] arg sockaddr_in where we will set our discovered address
* @return #GNUNET_OK on success,
* #GNUNET_NO if the packet is invalid (not a stun packet)
*/
int
GNUNET_NAT_stun_handle_packet_ (const void *data,
size_t len,
struct sockaddr_in *arg);
#endif
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