mirror of
https://github.com/NAStools/zerotierone.git
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99 lines
3.2 KiB
C++
99 lines
3.2 KiB
C++
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ZT_SELFAWARENESS_HPP
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#define ZT_SELFAWARENESS_HPP
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#include "Constants.hpp"
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#include "InetAddress.hpp"
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#include "Hashtable.hpp"
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#include "Address.hpp"
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#include "Mutex.hpp"
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namespace ZeroTier {
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class RuntimeEnvironment;
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/**
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* Tracks changes to this peer's real world addresses
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*/
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class SelfAwareness
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{
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public:
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SelfAwareness(const RuntimeEnvironment *renv);
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~SelfAwareness();
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/**
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* Called when a trusted remote peer informs us of our external network address
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*
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* @param reporter ZeroTier address of reporting peer
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* @param receivedOnLocalAddress Local address on which report was received
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* @param reporterPhysicalAddress Physical address that reporting peer seems to have
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* @param myPhysicalAddress Physical address that peer says we have
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* @param trusted True if this peer is trusted as an authority to inform us of external address changes
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* @param now Current time
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*/
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void iam(const Address &reporter,const InetAddress &receivedOnLocalAddress,const InetAddress &reporterPhysicalAddress,const InetAddress &myPhysicalAddress,bool trusted,uint64_t now);
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/**
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* Clean up database periodically
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*
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* @param now Current time
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*/
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void clean(uint64_t now);
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/**
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* If we appear to be behind a symmetric NAT, get predictions for possible external endpoints
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*
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* @return Symmetric NAT predictions or empty vector if none
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*/
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std::vector<InetAddress> getSymmetricNatPredictions();
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private:
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struct PhySurfaceKey
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{
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Address reporter;
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InetAddress receivedOnLocalAddress;
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InetAddress reporterPhysicalAddress;
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InetAddress::IpScope scope;
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PhySurfaceKey() : reporter(),scope(InetAddress::IP_SCOPE_NONE) {}
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PhySurfaceKey(const Address &r,const InetAddress &rol,const InetAddress &ra,InetAddress::IpScope s) : reporter(r),receivedOnLocalAddress(rol),reporterPhysicalAddress(ra),scope(s) {}
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inline unsigned long hashCode() const throw() { return ((unsigned long)reporter.toInt() + (unsigned long)scope); }
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inline bool operator==(const PhySurfaceKey &k) const throw() { return ((reporter == k.reporter)&&(receivedOnLocalAddress == k.receivedOnLocalAddress)&&(reporterPhysicalAddress == k.reporterPhysicalAddress)&&(scope == k.scope)); }
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};
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struct PhySurfaceEntry
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{
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InetAddress mySurface;
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uint64_t ts;
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PhySurfaceEntry() : mySurface(),ts(0) {}
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PhySurfaceEntry(const InetAddress &a,const uint64_t t) : mySurface(a),ts(t) {}
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};
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const RuntimeEnvironment *RR;
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Hashtable< PhySurfaceKey,PhySurfaceEntry > _phy;
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Mutex _phy_m;
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};
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} // namespace ZeroTier
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#endif
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