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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
*
* 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/>.
*/
#ifndef ZT_SELFAWARENESS_HPP
#define ZT_SELFAWARENESS_HPP
#include "Constants.hpp"
#include "InetAddress.hpp"
#include "Hashtable.hpp"
#include "Address.hpp"
#include "Mutex.hpp"
namespace ZeroTier {
class RuntimeEnvironment;
/**
* Tracks changes to this peer's real world addresses
*/
class SelfAwareness
{
public:
SelfAwareness(const RuntimeEnvironment *renv);
~SelfAwareness();
/**
* Called when a trusted remote peer informs us of our external network address
*
* @param reporter ZeroTier address of reporting peer
* @param receivedOnLocalAddress Local address on which report was received
* @param reporterPhysicalAddress Physical address that reporting peer seems to have
* @param myPhysicalAddress Physical address that peer says we have
* @param trusted True if this peer is trusted as an authority to inform us of external address changes
* @param now Current time
*/
void iam(const Address &reporter,const InetAddress &receivedOnLocalAddress,const InetAddress &reporterPhysicalAddress,const InetAddress &myPhysicalAddress,bool trusted,uint64_t now);
/**
* Clean up database periodically
*
* @param now Current time
*/
void clean(uint64_t now);
/**
* If we appear to be behind a symmetric NAT, get predictions for possible external endpoints
*
* @return Symmetric NAT predictions or empty vector if none
*/
std::vector<InetAddress> getSymmetricNatPredictions();
private:
struct PhySurfaceKey
{
Address reporter;
InetAddress receivedOnLocalAddress;
InetAddress reporterPhysicalAddress;
InetAddress::IpScope scope;
PhySurfaceKey() : reporter(),scope(InetAddress::IP_SCOPE_NONE) {}
PhySurfaceKey(const Address &r,const InetAddress &rol,const InetAddress &ra,InetAddress::IpScope s) : reporter(r),receivedOnLocalAddress(rol),reporterPhysicalAddress(ra),scope(s) {}
inline unsigned long hashCode() const throw() { return ((unsigned long)reporter.toInt() + (unsigned long)scope); }
inline bool operator==(const PhySurfaceKey &k) const throw() { return ((reporter == k.reporter)&&(receivedOnLocalAddress == k.receivedOnLocalAddress)&&(reporterPhysicalAddress == k.reporterPhysicalAddress)&&(scope == k.scope)); }
};
struct PhySurfaceEntry
{
InetAddress mySurface;
uint64_t ts;
PhySurfaceEntry() : mySurface(),ts(0) {}
PhySurfaceEntry(const InetAddress &a,const uint64_t t) : mySurface(a),ts(t) {}
};
const RuntimeEnvironment *RR;
Hashtable< PhySurfaceKey,PhySurfaceEntry > _phy;
Mutex _phy_m;
};
} // namespace ZeroTier
#endif
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