/*
 * ZeroTier One - Global Peer to Peer Ethernet
 * Copyright (C) 2011-2014  ZeroTier Networks LLC
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * --
 *
 * ZeroTier may be used and distributed under the terms of the GPLv3, which
 * are available at: http://www.gnu.org/licenses/gpl-3.0.html
 *
 * If you would like to embed ZeroTier into a commercial application or
 * redistribute it in a modified binary form, please contact ZeroTier Networks
 * LLC. Start here: http://www.zerotier.com/
 */

#ifndef ZT_TESTETHERNETTAP_HPP
#define ZT_TESTETHERNETTAP_HPP

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <stdexcept>
#include <queue>
#include <string>

#include "../node/Constants.hpp"
#include "../node/EthernetTap.hpp"
#include "../node/AtomicCounter.hpp"
#include "../node/SharedPtr.hpp"
#include "../node/Thread.hpp"
#include "../node/Mutex.hpp"
#include "../node/Condition.hpp"

namespace ZeroTier {

class TestEthernetTapFactory;

/**
 * Dummy Ethernet tap
 *
 * This tap device prints the contents of packets it receives on stdout
 * and also prints outgoing packets when they are injected. It does not
 * connect to any real tap or other interface. It's useful for running
 * test networks.
 */
class TestEthernetTap : public EthernetTap
{
	friend class SharedPtr<TestEthernetTap>;

public:
	struct TestFrame
	{
		TestFrame() : from(),to(),etherType(0),len(0) {}
		TestFrame(const MAC &f,const MAC &t,const void *d,unsigned int et,unsigned int l) :
			from(f),
			to(t),
			etherType(et),
			len(l)
		{
			memcpy(data,d,l);
		}
		MAC from;
		MAC to;
		unsigned int etherType;
		unsigned int len;
		char data[4096];
	};

	TestEthernetTap(
		TestEthernetTapFactory *parent,
		const MAC &mac,
		unsigned int mtu,
		unsigned int metric,
		uint64_t nwid,
		const char *desiredDevice,
		const char *friendlyName,
		void (*handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &),
		void *arg);

	virtual ~TestEthernetTap();

	virtual void setEnabled(bool en);
	virtual bool enabled() const;
	virtual bool addIP(const InetAddress &ip);
	virtual bool removeIP(const InetAddress &ip);
	virtual std::set<InetAddress> ips() const;
	virtual void put(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len);
	virtual std::string deviceName() const;
	virtual void setFriendlyName(const char *friendlyName);
	virtual bool updateMulticastGroups(std::set<MulticastGroup> &groups);
	virtual bool injectPacketFromHost(const MAC &from,const MAC &to,unsigned int etherType,const void *data,unsigned int len);

	inline uint64_t nwid() const { return _nwid; }

	// Get things that have been put() and empty queue
	inline void get(std::vector<TestFrame> &v,bool clearQueue = true)
	{
		Mutex::Lock _l(_gq_m);
		v = _gq;
		if (clearQueue)
			_gq.clear();
	}

	void threadMain()
		throw();

private:
	uint64_t _nwid;
	TestEthernetTapFactory *_parent;

	void (*_handler)(void *,const MAC &,const MAC &,unsigned int,const Buffer<4096> &);
	void *_arg;
	Thread _thread;
	std::string _dev;
	volatile bool _enabled;

	std::queue< TestFrame > _pq;
	Mutex _pq_m;
	Condition _pq_c;

	std::vector< TestFrame > _gq;
	Mutex _gq_m;

	AtomicCounter __refCount;
};

} // namespace ZeroTier

#endif