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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2015 ZeroTier, Inc.
*
* 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_REMOTEPATH_HPP
#define ZT_REMOTEPATH_HPP
#include <stdint.h>
#include <string.h>
#include <stdexcept>
#include <algorithm>
#include "Path.hpp"
#include "Node.hpp"
#include "AntiRecursion.hpp"
#include "RuntimeEnvironment.hpp"
#define ZT_REMOTEPATH_FLAG_FIXED 0x0001
namespace ZeroTier {
/**
* Path to a remote peer
*
* This extends Path to include status information about path activity.
*/
class RemotePath : public Path
{
public:
RemotePath() :
Path(),
_lastSend(0),
_lastReceived(0),
_localAddress(),
_flags(0) {}
RemotePath(const InetAddress &localAddress,const InetAddress &addr,bool fixed) :
Path(addr,0,TRUST_NORMAL),
_lastSend(0),
_lastReceived(0),
_localAddress(localAddress),
_flags(fixed ? ZT_REMOTEPATH_FLAG_FIXED : 0) {}
inline const InetAddress &localAddress() const throw() { return _localAddress; }
inline uint64_t lastSend() const throw() { return _lastSend; }
inline uint64_t lastReceived() const throw() { return _lastReceived; }
/**
* @return Is this a fixed path?
*/
inline bool fixed() const throw() { return ((_flags & ZT_REMOTEPATH_FLAG_FIXED) != 0); }
/**
* @param f New value of fixed flag
*/
inline void setFixed(const bool f)
throw()
{
if (f)
_flags |= ZT_REMOTEPATH_FLAG_FIXED;
else _flags &= ~ZT_REMOTEPATH_FLAG_FIXED;
}
/**
* Called when a packet is sent to this remote path
*
* This is called automatically by RemotePath::send().
*
* @param t Time of send
*/
inline void sent(uint64_t t)
throw()
{
_lastSend = t;
}
/**
* Called when a packet is received from this remote path
*
* @param t Time of receive
*/
inline void received(uint64_t t)
throw()
{
_lastReceived = t;
}
/**
* @param now Current time
* @return True if this path is fixed or has received data in last ACTIVITY_TIMEOUT ms
*/
inline bool active(uint64_t now) const
throw()
{
return ( ((_flags & ZT_REMOTEPATH_FLAG_FIXED) != 0) || ((now - _lastReceived) < ZT_PEER_ACTIVITY_TIMEOUT) );
}
/**
* Send a packet via this path
*
* @param RR Runtime environment
* @param data Packet data
* @param len Packet length
* @param now Current time
* @return True if transport reported success
*/
inline bool send(const RuntimeEnvironment *RR,const void *data,unsigned int len,uint64_t now)
{
if (RR->node->putPacket(_localAddress,address(),data,len)) {
sent(now);
RR->antiRec->logOutgoingZT(data,len);
return true;
}
return false;
}
template<unsigned int C>
inline void serialize(Buffer<C> &b) const
{
b.append((uint8_t)1); // version
_addr.serialize(b);
b.append((uint8_t)_trust);
b.append((uint64_t)_lastSend);
b.append((uint64_t)_lastReceived);
_localAddress.serialize(b);
b.append((uint16_t)_flags);
}
template<unsigned int C>
inline unsigned int deserialize(const Buffer<C> &b,unsigned int startAt = 0)
{
unsigned int p = startAt;
if (b[p++] != 1)
throw std::invalid_argument("invalid serialized RemotePath");
p += _addr.deserialize(b,p);
_ipScope = _addr.ipScope();
_trust = (Path::Trust)b[p++];
_lastSend = b.template at<uint64_t>(p); p += 8;
_lastReceived = b.template at<uint64_t>(p); p += 8;
p += _localAddress.deserialize(b,p);
_flags = b.template at<uint16_t>(p); p += 2;
return (p - startAt);
}
protected:
uint64_t _lastSend;
uint64_t _lastReceived;
InetAddress _localAddress;
uint16_t _flags;
};
} // namespace ZeroTier
#endif
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