mirror of
https://github.com/zerotier/ZeroTierOne.git
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108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
/*
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* Copyright (c)2013-2020 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2024-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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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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#include <map>
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namespace ZeroTier {
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class RuntimeEnvironment;
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/**
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* SelfAwareness manages awareness of this peer's external address(es) and NAT situation.
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*
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* This code should not be capable of achieving sentience and triggering the Terminator wars.
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*/
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class SelfAwareness
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{
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public:
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explicit SelfAwareness(const RuntimeEnvironment *renv);
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~SelfAwareness();
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/**
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* Called when a 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(void *tPtr,const Address &reporter,int64_t receivedOnLocalSocket,const InetAddress &reporterPhysicalAddress,const InetAddress &myPhysicalAddress,bool trusted,int64_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(int64_t now);
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/**
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* Check whether this node appears to be behind a symmetric NAT
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*
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* @param now Current time
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* @return True if it looks like we're behind a symmetric NAT
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*/
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bool symmetricNat(int64_t now) const;
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/**
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* Get external address consensus, which is the statistical "mode" of external addresses.
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*
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* @param now Current time
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* @return Map of count to IP/port representing how many endpoints reported each address
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*/
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std::multimap<unsigned long,InetAddress> externalAddresses(int64_t now) const;
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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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int64_t receivedOnLocalSocket;
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InetAddress reporterPhysicalAddress;
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InetAddress::IpScope scope;
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ZT_ALWAYS_INLINE PhySurfaceKey() {}
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ZT_ALWAYS_INLINE PhySurfaceKey(const Address &r,const int64_t rol,const InetAddress &ra,InetAddress::IpScope s) : reporter(r),receivedOnLocalSocket(rol),reporterPhysicalAddress(ra),scope(s) {}
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ZT_ALWAYS_INLINE unsigned long hashCode() const { return ((unsigned long)reporter.toInt() + (unsigned long)receivedOnLocalSocket + (unsigned long)scope); }
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ZT_ALWAYS_INLINE bool operator==(const PhySurfaceKey &k) const { return ((reporter == k.reporter)&&(receivedOnLocalSocket == k.receivedOnLocalSocket)&&(reporterPhysicalAddress == k.reporterPhysicalAddress)&&(scope == k.scope)); }
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ZT_ALWAYS_INLINE bool operator!=(const PhySurfaceKey &k) const { return (!(*this == k)); }
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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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bool trusted;
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ZT_ALWAYS_INLINE PhySurfaceEntry() : mySurface(),ts(0),trusted(false) {}
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ZT_ALWAYS_INLINE PhySurfaceEntry(const InetAddress &a,const uint64_t t) : mySurface(a),ts(t),trusted(false) {}
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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_l;
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};
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} // namespace ZeroTier
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#endif
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