/*
 * Copyright (c)2019 ZeroTier, Inc.
 *
 * Use of this software is governed by the Business Source License included
 * in the LICENSE.TXT file in the project's root directory.
 *
 * Change Date: 2023-01-01
 *
 * On the date above, in accordance with the Business Source License, use
 * of this software will be governed by version 2.0 of the Apache License.
 */
/****/

#ifndef ZT_MANAGEDROUTE_HPP
#define ZT_MANAGEDROUTE_HPP

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

#include "../node/InetAddress.hpp"
#include "../node/Utils.hpp"
#include "../node/SharedPtr.hpp"
#include "../node/AtomicCounter.hpp"

#include <stdexcept>
#include <vector>
#include <map>

namespace ZeroTier {

/**
 * A ZT-managed route that used C++ RAII semantics to automatically clean itself up on deallocate
 */
class ManagedRoute
{
	friend class SharedPtr<ManagedRoute>;

public:
	ZT_ALWAYS_INLINE ManagedRoute(const InetAddress &target,const InetAddress &via,const char *device)
	{
		_target = target;
		_via = via;
		if (via.ss_family == AF_INET)
			_via.setPort(32);
		else if (via.ss_family == AF_INET6)
			_via.setPort(128);
		Utils::scopy(_device,sizeof(_device),device);
		_systemDevice[0] = (char)0;
	}

	ZT_ALWAYS_INLINE ~ManagedRoute() { this->remove(); }

	/**
	 * Set or update currently set route
	 *
	 * This must be called periodically for routes that shadow others so that
	 * shadow routes can be updated. In some cases it has no effect
	 *
	 * @return True if route add/update was successful
	 */
	bool sync();

	/**
	 * Remove and clear this ManagedRoute
	 *
	 * This does nothing if this ManagedRoute is not set or has already been
	 * removed. If this is not explicitly called it is called automatically on
	 * destruct.
	 */
	void remove();

	ZT_ALWAYS_INLINE const InetAddress &target() const { return _target; }
	ZT_ALWAYS_INLINE const InetAddress &via() const { return _via; }
	ZT_ALWAYS_INLINE const char *device() const { return _device; }

private:
	ZT_ALWAYS_INLINE ManagedRoute(const ManagedRoute &) {}
	ZT_ALWAYS_INLINE ManagedRoute &operator=(const ManagedRoute &) { return *this; }

	InetAddress _target;
	InetAddress _via;
	InetAddress _systemVia; // for route overrides
	std::map<InetAddress,bool> _applied; // routes currently applied
	char _device[128];
	char _systemDevice[128]; // for route overrides

	AtomicCounter __refCount;
};

} // namespace ZeroTier

#endif