#ifndef RS_UDP_STUN_H
#define RS_UDP_STUN_H
/*
 * tcponudp/udpstunner.h
 *
 * libretroshare.
 *
 * Copyright 2010 by Robert Fernie
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License Version 3 as published by the Free Software Foundation.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA.
 *
 * Please report all bugs and problems to "retroshare@lunamutt.com".
 *
 */

#include <netinet/in.h>

#include "tcponudp/rsudpstack.h"
#include "util/rsthreads.h"
#include <string>

/* UdpStun.
 * Stuns peers to determine external addresses.
 */

class TouStunPeer
{
	public:
	TouStunPeer()
	:response(false), lastsend(0), failCount(0) 
	{ 
		eaddr.sin_addr.s_addr = 0;
		eaddr.sin_port = 0;
		return; 
	}
	
	TouStunPeer(std::string id_in, const struct sockaddr_in &addr)
	:id(id_in), remote(addr), response(false), lastsend(0), failCount(0)
	{ 
		eaddr.sin_addr.s_addr = 0;
		eaddr.sin_port = 0;
		return; 
	}
	
	std::string id;
	struct sockaddr_in remote, eaddr;
	bool response;
	time_t lastsend;
	uint32_t failCount;
};
	

class UdpStunner: public UdpSubReceiver
{
	public:

	UdpStunner(UdpPublisher *pub);
virtual ~UdpStunner() { return; }

bool 	setStunKeepAlive(uint32_t required);
bool    addStunPeer(const struct sockaddr_in &remote, const char *peerid);
bool    getStunPeer(int idx, std::string &id,
                struct sockaddr_in &remote, struct sockaddr_in &eaddr,
                uint32_t &failCount, time_t &lastSend);

bool    checkStunKeepAlive();
bool	needStunPeers();

bool    externalAddr(struct sockaddr_in &remote, uint8_t &stable);

	/* Packet IO */
virtual int recvPkt(void *data, int size, struct sockaddr_in &from);
virtual int status(std::ostream &out);

	/* monitoring / updates */
	int tick();

	private:

	/* STUN handling */
bool 	locked_handleStunPkt(void *data, int size, struct sockaddr_in &from);

int     doStun(struct sockaddr_in stun_addr);

	/* stun keepAlive */
bool    locked_printStunList();
bool    locked_recvdStun(const struct sockaddr_in &remote, const struct sockaddr_in &extaddr);
bool    locked_checkExternalAddress();

bool    storeStunPeer(const struct sockaddr_in &remote, const char *peerid, bool sent);

	RsMutex stunMtx; /* for all class data (below) */

	struct sockaddr_in eaddr; /* external addr */

        bool eaddrKnown;
	bool eaddrStable; /* if true then usable. if false -> Symmettric NAT */
	time_t eaddrTime;

	bool mStunKeepAlive;
	time_t mStunLastRecv;
	time_t mStunLastSend;

	std::list<TouStunPeer> mStunList; /* potentials */

};

	/* generic stun functions */

bool	UdpStun_isStunPacket(void *data, int size);
bool    UdpStun_response(void *stun_pkt, int size, struct sockaddr_in &addr);
void   *UdpStun_generate_stun_reply(struct sockaddr_in *stun_addr, int *len);
bool    UdpStun_generate_stun_pkt(void *stun_pkt, int *len);

#endif