mirror of https://github.com/PurpleI2P/i2pd.git
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4 years ago
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42 changed files with 536 additions and 2093 deletions
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/*
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* Copyright (c) 2013-2020, 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 NTCP_SESSION_H__ |
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#define NTCP_SESSION_H__ |
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#include <inttypes.h> |
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#include <map> |
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#include <memory> |
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#include <thread> |
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#include <mutex> |
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#include <boost/asio.hpp> |
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#include "Crypto.h" |
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#include "Identity.h" |
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#include "RouterInfo.h" |
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#include "I2NPProtocol.h" |
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#include "TransportSession.h" |
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#include "CryptoWorker.h" |
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namespace i2p |
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{ |
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namespace transport |
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{ |
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struct NTCPPhase1 |
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{ |
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uint8_t pubKey[256]; |
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uint8_t HXxorHI[32]; |
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}; |
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struct NTCPPhase2 |
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{ |
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uint8_t pubKey[256]; |
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struct |
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{ |
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uint8_t hxy[32]; |
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uint8_t timestamp[4]; |
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uint8_t filler[12]; |
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} encrypted; |
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}; |
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struct NTCPWork; |
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const size_t NTCP_MAX_MESSAGE_SIZE = 16384; |
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const size_t NTCP_BUFFER_SIZE = 1028; // fits 1 tunnel data message
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const int NTCP_CONNECT_TIMEOUT = 5; // 5 seconds
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const int NTCP_ESTABLISH_TIMEOUT = 10; // 10 seconds
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const int NTCP_TERMINATION_TIMEOUT = 120; // 2 minutes
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const int NTCP_TERMINATION_CHECK_TIMEOUT = 30; // 30 seconds
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const size_t NTCP_DEFAULT_PHASE3_SIZE = 2/*size*/ + i2p::data::DEFAULT_IDENTITY_SIZE/*387*/ + 4/*ts*/ + 15/*padding*/ + 40/*signature*/; // 448
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const int NTCP_CLOCK_SKEW = 60; // in seconds
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const int NTCP_MAX_OUTGOING_QUEUE_SIZE = 200; // how many messages we can queue up
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class NTCPServer; |
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class NTCPSession: public TransportSession, public std::enable_shared_from_this<NTCPSession> |
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{ |
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public: |
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NTCPSession (NTCPServer& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter = nullptr); |
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~NTCPSession (); |
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void Terminate (); |
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void Done (); |
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boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; }; |
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boost::asio::io_service & GetService(); |
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bool IsEstablished () const { return m_IsEstablished; }; |
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bool IsTerminated () const { return m_IsTerminated; }; |
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void ClientLogin (); |
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void ServerLogin (); |
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void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs); |
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private: |
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void PostI2NPMessages (std::vector<std::shared_ptr<I2NPMessage> > msgs); |
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void Connected (); |
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void SendTimeSyncMessage (); |
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void SetIsEstablished (bool isEstablished) { m_IsEstablished = isEstablished; } |
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void CreateAESKey (uint8_t * pubKey); |
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// client
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void SendPhase3 (); |
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void HandlePhase1Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred); |
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void HandlePhase2Received (const boost::system::error_code& ecode, std::size_t bytes_transferred); |
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void HandlePhase2 (NTCPWork * work=nullptr); |
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void HandlePhase3Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsA); |
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void HandlePhase4Received (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsA); |
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//server
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void SendPhase2 (NTCPWork * work=nullptr); |
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void SendPhase4 (uint32_t tsA, uint32_t tsB); |
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void HandlePhase1Received (const boost::system::error_code& ecode, std::size_t bytes_transferred); |
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void HandlePhase2Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB); |
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void HandlePhase3Received (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB); |
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void HandlePhase3ExtraReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB, size_t paddingLen); |
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void HandlePhase3 (uint32_t tsB, size_t paddingLen); |
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void HandlePhase4Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred); |
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// common
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void Receive (); |
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void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred); |
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bool DecryptNextBlock (const uint8_t * encrypted); |
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void Send (std::shared_ptr<i2p::I2NPMessage> msg); |
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boost::asio::const_buffers_1 CreateMsgBuffer (std::shared_ptr<I2NPMessage> msg); |
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void Send (const std::vector<std::shared_ptr<I2NPMessage> >& msgs); |
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void HandleSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, std::vector<std::shared_ptr<I2NPMessage> > msgs); |
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private: |
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NTCPServer& m_Server; |
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boost::asio::ip::tcp::socket m_Socket; |
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bool m_IsEstablished, m_IsTerminated; |
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i2p::crypto::CBCDecryption m_Decryption; |
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i2p::crypto::CBCEncryption m_Encryption; |
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struct Establisher |
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{ |
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NTCPPhase1 phase1; |
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NTCPPhase2 phase2; |
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} * m_Establisher; |
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i2p::crypto::AESAlignedBuffer<NTCP_BUFFER_SIZE + 16> m_ReceiveBuffer; |
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i2p::crypto::AESAlignedBuffer<16> m_TimeSyncBuffer; |
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int m_ReceiveBufferOffset; |
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std::shared_ptr<I2NPMessage> m_NextMessage; |
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size_t m_NextMessageOffset; |
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i2p::I2NPMessagesHandler m_Handler; |
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bool m_IsSending; |
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std::vector<std::shared_ptr<I2NPMessage> > m_SendQueue; |
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}; |
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// TODO: move to NTCP.h/.cpp
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class NTCPServer |
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{ |
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public: |
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typedef i2p::worker::ThreadPool<NTCPSession> Pool; |
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enum RemoteAddressType |
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{ |
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eIP4Address, |
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eIP6Address, |
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eHostname |
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}; |
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enum ProxyType |
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{ |
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eNoProxy, |
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eSocksProxy, |
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eHTTPProxy |
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}; |
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NTCPServer (int workers=4); |
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~NTCPServer (); |
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void Start (); |
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void Stop (); |
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bool AddNTCPSession (std::shared_ptr<NTCPSession> session); |
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void RemoveNTCPSession (std::shared_ptr<NTCPSession> session); |
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std::shared_ptr<NTCPSession> FindNTCPSession (const i2p::data::IdentHash& ident); |
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void ConnectWithProxy (const std::string& addr, uint16_t port, RemoteAddressType addrtype, std::shared_ptr<NTCPSession> conn); |
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void Connect(const boost::asio::ip::address & address, uint16_t port, std::shared_ptr<NTCPSession> conn); |
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bool IsBoundV4() const { return m_NTCPAcceptor != nullptr; }; |
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bool IsBoundV6() const { return m_NTCPV6Acceptor != nullptr; }; |
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bool NetworkIsReady() const { return IsBoundV4() || IsBoundV6() || UsingProxy(); }; |
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bool UsingProxy() const { return m_ProxyType != eNoProxy; }; |
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void UseProxy(ProxyType proxy, const std::string & address, uint16_t port); |
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boost::asio::io_service& GetService () { return m_Service; }; |
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void SetSessionLimits(uint16_t softLimit, uint16_t hardLimit) { m_SoftLimit = softLimit; m_HardLimit = hardLimit; } |
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bool ShouldLimit() const { return ShouldHardLimit() || ShouldSoftLimit(); } |
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void Work(std::shared_ptr<NTCPSession> conn, Pool::WorkFunc work) |
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{ |
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m_CryptoPool->Offer({conn, work}); |
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} |
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private: |
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/** @brief return true for hard limit */ |
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bool ShouldHardLimit() const { return m_HardLimit && m_NTCPSessions.size() >= m_HardLimit; } |
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/** @brief return true for probabalistic soft backoff */ |
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bool ShouldSoftLimit() const |
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{ |
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auto sessions = m_NTCPSessions.size(); |
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return sessions && m_SoftLimit && m_SoftLimit < sessions && ( rand() % sessions ) <= m_SoftLimit; |
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} |
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void Run (); |
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void HandleAccept (std::shared_ptr<NTCPSession> conn, const boost::system::error_code& error); |
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void HandleAcceptV6 (std::shared_ptr<NTCPSession> conn, const boost::system::error_code& error); |
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void HandleConnect (const boost::system::error_code& ecode, std::shared_ptr<NTCPSession> conn, std::shared_ptr<boost::asio::deadline_timer> timer); |
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void HandleProxyConnect(const boost::system::error_code& ecode, std::shared_ptr<NTCPSession> conn, std::shared_ptr<boost::asio::deadline_timer> timer, const std::string & host, uint16_t port, RemoteAddressType adddrtype); |
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void AfterSocksHandshake(std::shared_ptr<NTCPSession> conn, std::shared_ptr<boost::asio::deadline_timer> timer, const std::string & host, uint16_t port, RemoteAddressType adddrtype); |
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// timer
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void ScheduleTermination (); |
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void HandleTerminationTimer (const boost::system::error_code& ecode); |
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private: |
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bool m_IsRunning; |
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std::thread * m_Thread; |
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boost::asio::io_service m_Service; |
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boost::asio::io_service::work m_Work; |
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boost::asio::deadline_timer m_TerminationTimer; |
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boost::asio::ip::tcp::acceptor * m_NTCPAcceptor, * m_NTCPV6Acceptor; |
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std::map<i2p::data::IdentHash, std::shared_ptr<NTCPSession> > m_NTCPSessions; // access from m_Thread only
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std::list<std::shared_ptr<NTCPSession> > m_PendingIncomingSessions; |
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ProxyType m_ProxyType; |
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std::string m_ProxyAddress; |
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uint16_t m_ProxyPort; |
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boost::asio::ip::tcp::resolver m_Resolver; |
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boost::asio::ip::tcp::endpoint * m_ProxyEndpoint; |
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std::shared_ptr<Pool> m_CryptoPool; |
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uint16_t m_SoftLimit, m_HardLimit; |
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public: |
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// for HTTP/I2PControl
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const decltype(m_NTCPSessions)& GetNTCPSessions () const { return m_NTCPSessions; }; |
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}; |
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} |
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} |
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#endif |
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