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318 lines
12 KiB
C++
318 lines
12 KiB
C++
/*
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* Copyright (c) 2013-2023, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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#ifndef TUNNEL_H__
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#define TUNNEL_H__
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#include <inttypes.h>
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#include <map>
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#include <unordered_map>
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#include <list>
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#include <vector>
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#include <string>
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#include <thread>
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#include <mutex>
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#include <memory>
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#include "util.h"
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#include "Queue.h"
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#include "Crypto.h"
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#include "TunnelConfig.h"
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#include "TunnelPool.h"
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#include "TransitTunnel.h"
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#include "TunnelEndpoint.h"
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#include "TunnelGateway.h"
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#include "TunnelBase.h"
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#include "I2NPProtocol.h"
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namespace i2p
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{
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namespace tunnel
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{
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const int TUNNEL_EXPIRATION_TIMEOUT = 660; // 11 minutes
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const int TUNNEL_EXPIRATION_THRESHOLD = 60; // 1 minute
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const int TUNNEL_RECREATION_THRESHOLD = 90; // 1.5 minutes
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const int TUNNEL_CREATION_TIMEOUT = 30; // 30 seconds
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const int STANDARD_NUM_RECORDS = 4; // in VariableTunnelBuild message
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const int MAX_NUM_RECORDS = 8;
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const int HIGH_LATENCY_PER_HOP = 250; // in milliseconds
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const int MAX_TUNNEL_MSGS_BATCH_SIZE = 100; // handle messages without interrupt
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const int TUNNEL_MANAGE_INTERVAL = 15; // in seconds
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const int TUNNEL_POOLS_MANAGE_INTERVAL = 5; // in seconds
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const int TUNNEL_MEMORY_POOL_MANAGE_INTERVAL = 120; // in seconds
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const size_t I2NP_TUNNEL_MESSAGE_SIZE = TUNNEL_DATA_MSG_SIZE + I2NP_HEADER_SIZE + 34; // reserved for alignment and NTCP 16 + 6 + 12
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const size_t I2NP_TUNNEL_ENPOINT_MESSAGE_SIZE = 2*TUNNEL_DATA_MSG_SIZE + I2NP_HEADER_SIZE + TUNNEL_GATEWAY_HEADER_SIZE + 28; // reserved for alignment and NTCP 16 + 6 + 6
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const double TCSR_SMOOTHING_CONSTANT = 0.0005; // smoothing constant in exponentially weighted moving average
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const double TCSR_START_VALUE = 0.1; // start value of tunnel creation success rate
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enum TunnelState
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{
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eTunnelStatePending,
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eTunnelStateBuildReplyReceived,
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eTunnelStateBuildFailed,
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eTunnelStateEstablished,
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eTunnelStateTestFailed,
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eTunnelStateFailed,
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eTunnelStateExpiring
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};
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class OutboundTunnel;
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class InboundTunnel;
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class Tunnel: public TunnelBase
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{
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struct TunnelHop
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{
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std::shared_ptr<const i2p::data::IdentityEx> ident;
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i2p::crypto::TunnelDecryption decryption;
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};
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public:
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/** function for visiting a hops stored in a tunnel */
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typedef std::function<void(std::shared_ptr<const i2p::data::IdentityEx>)> TunnelHopVisitor;
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Tunnel (std::shared_ptr<const TunnelConfig> config);
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~Tunnel ();
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void Build (uint32_t replyMsgID, std::shared_ptr<OutboundTunnel> outboundTunnel = nullptr);
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std::shared_ptr<const TunnelConfig> GetTunnelConfig () const { return m_Config; }
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std::vector<std::shared_ptr<const i2p::data::IdentityEx> > GetPeers () const;
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std::vector<std::shared_ptr<const i2p::data::IdentityEx> > GetInvertedPeers () const;
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bool IsShortBuildMessage () const { return m_IsShortBuildMessage; };
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i2p::data::RouterInfo::CompatibleTransports GetFarEndTransports () const { return m_FarEndTransports; };
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TunnelState GetState () const { return m_State; };
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void SetState (TunnelState state);
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bool IsEstablished () const { return m_State == eTunnelStateEstablished; };
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bool IsFailed () const { return m_State == eTunnelStateFailed; };
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bool IsRecreated () const { return m_IsRecreated; };
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void SetRecreated (bool recreated) { m_IsRecreated = recreated; };
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int GetNumHops () const { return m_Hops.size (); };
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virtual bool IsInbound() const = 0;
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std::shared_ptr<TunnelPool> GetTunnelPool () const { return m_Pool; };
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void SetTunnelPool (std::shared_ptr<TunnelPool> pool) { m_Pool = pool; };
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bool HandleTunnelBuildResponse (uint8_t * msg, size_t len);
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// implements TunnelBase
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void SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg);
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void EncryptTunnelMsg (std::shared_ptr<const I2NPMessage> in, std::shared_ptr<I2NPMessage> out);
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/** @brief add latency sample */
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void AddLatencySample(const uint64_t ms) { m_Latency = (m_Latency + ms) >> 1; }
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/** @brief get this tunnel's estimated latency */
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uint64_t GetMeanLatency() const { return m_Latency; }
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/** @brief return true if this tunnel's latency fits in range [lowerbound, upperbound] */
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bool LatencyFitsRange(uint64_t lowerbound, uint64_t upperbound) const;
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bool LatencyIsKnown() const { return m_Latency > 0; }
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bool IsSlow () const { return LatencyIsKnown() && (int)m_Latency > HIGH_LATENCY_PER_HOP*GetNumHops (); }
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/** visit all hops we currently store */
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void VisitTunnelHops(TunnelHopVisitor v);
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private:
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std::shared_ptr<const TunnelConfig> m_Config;
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std::vector<TunnelHop> m_Hops;
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bool m_IsShortBuildMessage;
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std::shared_ptr<TunnelPool> m_Pool; // pool, tunnel belongs to, or null
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TunnelState m_State;
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i2p::data::RouterInfo::CompatibleTransports m_FarEndTransports;
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bool m_IsRecreated; // if tunnel is replaced by new, or new tunnel requested to replace
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uint64_t m_Latency; // in milliseconds
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};
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class OutboundTunnel: public Tunnel
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{
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public:
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OutboundTunnel (std::shared_ptr<const TunnelConfig> config):
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Tunnel (config), m_Gateway (this), m_EndpointIdentHash (config->GetLastIdentHash ()) {};
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void SendTunnelDataMsg (const uint8_t * gwHash, uint32_t gwTunnel, std::shared_ptr<i2p::I2NPMessage> msg);
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virtual void SendTunnelDataMsg (const std::vector<TunnelMessageBlock>& msgs); // multiple messages
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const i2p::data::IdentHash& GetEndpointIdentHash () const { return m_EndpointIdentHash; };
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virtual size_t GetNumSentBytes () const { return m_Gateway.GetNumSentBytes (); };
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// implements TunnelBase
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void HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg);
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bool IsInbound() const { return false; }
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private:
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std::mutex m_SendMutex;
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TunnelGateway m_Gateway;
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i2p::data::IdentHash m_EndpointIdentHash;
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};
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class InboundTunnel: public Tunnel, public std::enable_shared_from_this<InboundTunnel>
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{
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public:
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InboundTunnel (std::shared_ptr<const TunnelConfig> config): Tunnel (config), m_Endpoint (true) {};
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void HandleTunnelDataMsg (std::shared_ptr<I2NPMessage>&& msg);
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virtual size_t GetNumReceivedBytes () const { return m_Endpoint.GetNumReceivedBytes (); };
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bool IsInbound() const { return true; }
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// override TunnelBase
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void Cleanup () { m_Endpoint.Cleanup (); };
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private:
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TunnelEndpoint m_Endpoint;
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};
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class ZeroHopsInboundTunnel: public InboundTunnel
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{
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public:
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ZeroHopsInboundTunnel ();
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void SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg);
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size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; };
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private:
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size_t m_NumReceivedBytes;
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};
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class ZeroHopsOutboundTunnel: public OutboundTunnel
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{
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public:
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ZeroHopsOutboundTunnel ();
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void SendTunnelDataMsg (const std::vector<TunnelMessageBlock>& msgs);
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size_t GetNumSentBytes () const { return m_NumSentBytes; };
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private:
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size_t m_NumSentBytes;
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};
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class Tunnels
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{
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public:
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Tunnels ();
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~Tunnels ();
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void Start ();
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void Stop ();
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std::shared_ptr<InboundTunnel> GetPendingInboundTunnel (uint32_t replyMsgID);
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std::shared_ptr<OutboundTunnel> GetPendingOutboundTunnel (uint32_t replyMsgID);
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std::shared_ptr<InboundTunnel> GetNextInboundTunnel ();
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std::shared_ptr<OutboundTunnel> GetNextOutboundTunnel ();
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std::shared_ptr<TunnelPool> GetExploratoryPool () const { return m_ExploratoryPool; };
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std::shared_ptr<TunnelBase> GetTunnel (uint32_t tunnelID);
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int GetTransitTunnelsExpirationTimeout ();
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bool AddTransitTunnel (std::shared_ptr<TransitTunnel> tunnel);
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void AddOutboundTunnel (std::shared_ptr<OutboundTunnel> newTunnel);
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void AddInboundTunnel (std::shared_ptr<InboundTunnel> newTunnel);
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std::shared_ptr<InboundTunnel> CreateInboundTunnel (std::shared_ptr<TunnelConfig> config, std::shared_ptr<TunnelPool> pool, std::shared_ptr<OutboundTunnel> outboundTunnel);
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std::shared_ptr<OutboundTunnel> CreateOutboundTunnel (std::shared_ptr<TunnelConfig> config, std::shared_ptr<TunnelPool> pool);
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void PostTunnelData (std::shared_ptr<I2NPMessage> msg);
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void PostTunnelData (const std::vector<std::shared_ptr<I2NPMessage> >& msgs);
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void AddPendingTunnel (uint32_t replyMsgID, std::shared_ptr<InboundTunnel> tunnel);
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void AddPendingTunnel (uint32_t replyMsgID, std::shared_ptr<OutboundTunnel> tunnel);
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std::shared_ptr<TunnelPool> CreateTunnelPool (int numInboundHops, int numOuboundHops,
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int numInboundTunnels, int numOutboundTunnels, int inboundVariance, int outboundVariance);
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void DeleteTunnelPool (std::shared_ptr<TunnelPool> pool);
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void StopTunnelPool (std::shared_ptr<TunnelPool> pool);
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std::shared_ptr<I2NPMessage> NewI2NPTunnelMessage (bool endpoint);
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private:
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template<class TTunnel>
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std::shared_ptr<TTunnel> CreateTunnel (std::shared_ptr<TunnelConfig> config,
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std::shared_ptr<TunnelPool> pool, std::shared_ptr<OutboundTunnel> outboundTunnel = nullptr);
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template<class TTunnel>
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std::shared_ptr<TTunnel> GetPendingTunnel (uint32_t replyMsgID, const std::map<uint32_t, std::shared_ptr<TTunnel> >& pendingTunnels);
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void HandleTunnelGatewayMsg (std::shared_ptr<TunnelBase> tunnel, std::shared_ptr<I2NPMessage> msg);
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void Run ();
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void ManageTunnels ();
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void ManageOutboundTunnels ();
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void ManageInboundTunnels ();
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void ManageTransitTunnels ();
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void ManagePendingTunnels ();
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template<class PendingTunnels>
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void ManagePendingTunnels (PendingTunnels& pendingTunnels);
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void ManageTunnelPools (uint64_t ts);
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std::shared_ptr<ZeroHopsInboundTunnel> CreateZeroHopsInboundTunnel (std::shared_ptr<TunnelPool> pool);
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std::shared_ptr<ZeroHopsOutboundTunnel> CreateZeroHopsOutboundTunnel (std::shared_ptr<TunnelPool> pool);
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private:
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bool m_IsRunning;
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std::thread * m_Thread;
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std::map<uint32_t, std::shared_ptr<InboundTunnel> > m_PendingInboundTunnels; // by replyMsgID
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std::map<uint32_t, std::shared_ptr<OutboundTunnel> > m_PendingOutboundTunnels; // by replyMsgID
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std::list<std::shared_ptr<InboundTunnel> > m_InboundTunnels;
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std::list<std::shared_ptr<OutboundTunnel> > m_OutboundTunnels;
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std::list<std::shared_ptr<TransitTunnel> > m_TransitTunnels;
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std::unordered_map<uint32_t, std::shared_ptr<TunnelBase> > m_Tunnels; // tunnelID->tunnel known by this id
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std::mutex m_PoolsMutex;
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std::list<std::shared_ptr<TunnelPool>> m_Pools;
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std::shared_ptr<TunnelPool> m_ExploratoryPool;
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i2p::util::Queue<std::shared_ptr<I2NPMessage> > m_Queue;
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i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_TUNNEL_ENPOINT_MESSAGE_SIZE> > m_I2NPTunnelEndpointMessagesMemoryPool;
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i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_TUNNEL_MESSAGE_SIZE> > m_I2NPTunnelMessagesMemoryPool;
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// count of tunnels for total TCSR algorithm
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int m_TotalNumSuccesiveTunnelCreations, m_TotalNumFailedTunnelCreations;
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// Calculating of tunnel creation success rate
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void SuccesiveTunnelCreation() {
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// total TCSR
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m_TotalNumSuccesiveTunnelCreations++;
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// A modified version of the EWMA algorithm, where alpha is increased at the beginning to accelerate similarity
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double alpha = TCSR_SMOOTHING_CONSTANT + (1 - TCSR_SMOOTHING_CONSTANT)/++m_TunnelCreationAttemptsNum;
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m_TunnelCreationSuccessRate = alpha * 1 + (1 - alpha) * m_TunnelCreationSuccessRate;
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};
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void FailedTunnelCreation() {
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m_TotalNumFailedTunnelCreations++;
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double alpha = TCSR_SMOOTHING_CONSTANT + (1 - TCSR_SMOOTHING_CONSTANT)/++m_TunnelCreationAttemptsNum;
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m_TunnelCreationSuccessRate = alpha * 0 + (1 - alpha) * m_TunnelCreationSuccessRate;
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};
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double m_TunnelCreationSuccessRate;
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int m_TunnelCreationAttemptsNum;
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public:
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// for HTTP only
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const decltype(m_OutboundTunnels)& GetOutboundTunnels () const { return m_OutboundTunnels; };
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const decltype(m_InboundTunnels)& GetInboundTunnels () const { return m_InboundTunnels; };
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const decltype(m_TransitTunnels)& GetTransitTunnels () const { return m_TransitTunnels; };
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size_t CountTransitTunnels() const;
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size_t CountInboundTunnels() const;
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size_t CountOutboundTunnels() const;
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int GetQueueSize () { return m_Queue.GetSize (); };
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int GetTunnelCreationSuccessRate () const { return std::round(m_TunnelCreationSuccessRate * 100); } // in percents
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int GetTotalTunnelCreationSuccessRate () const // in percents
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{
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int totalNum = m_TotalNumSuccesiveTunnelCreations + m_TotalNumFailedTunnelCreations;
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return totalNum ? m_TotalNumSuccesiveTunnelCreations*100/totalNum : 0;
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}
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};
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extern Tunnels tunnels;
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}
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}
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#endif
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