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I2P: End-to-End encrypted and anonymous Internet
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186 lines
8.3 KiB
186 lines
8.3 KiB
/* |
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* Copyright (c) 2022-2024, 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 SSU2_H__ |
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#define SSU2_H__ |
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#include <unordered_map> |
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#include <mutex> |
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#include "util.h" |
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#include "SSU2Session.h" |
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#include "Socks5.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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const int SSU2_TERMINATION_CHECK_TIMEOUT = 25; // in seconds |
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const int SSU2_CLEANUP_INTERVAL = 72; // in seconds |
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const int SSU2_RESEND_CHECK_TIMEOUT = 40; // in milliseconds |
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const int SSU2_RESEND_CHECK_TIMEOUT_VARIANCE = 10; // in milliseconds |
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const int SSU2_RESEND_CHECK_MORE_TIMEOUT = 10; // in milliseconds |
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const size_t SSU2_MAX_RESEND_PACKETS = 128; // packets to resend at the time |
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const uint64_t SSU2_SOCKET_MIN_BUFFER_SIZE = 128 * 1024; |
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const uint64_t SSU2_SOCKET_MAX_BUFFER_SIZE = 4 * 1024 * 1024; |
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const size_t SSU2_MAX_NUM_INTRODUCERS = 3; |
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const size_t SSU2_MIN_RECEIVED_PACKET_SIZE = 40; // 16 byte short header + 8 byte minimum payload + 16 byte MAC |
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const int SSU2_TO_INTRODUCER_SESSION_DURATION = 3600; // 1 hour |
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const int SSU2_TO_INTRODUCER_SESSION_EXPIRATION = 4800; // 80 minutes |
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const int SSU2_KEEP_ALIVE_INTERVAL = 15; // in seconds |
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const int SSU2_KEEP_ALIVE_INTERVAL_VARIANCE = 4; // in seconds |
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const int SSU2_PROXY_CONNECT_RETRY_TIMEOUT = 30; // in seconds |
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class SSU2Server: private i2p::util::RunnableServiceWithWork |
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{ |
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struct Packet |
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{ |
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uint8_t buf[SSU2_MAX_PACKET_SIZE]; |
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size_t len; |
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boost::asio::ip::udp::endpoint from; |
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}; |
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class ReceiveService: public i2p::util::RunnableService |
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{ |
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public: |
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ReceiveService (const std::string& name): RunnableService (name) {}; |
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boost::asio::io_service& GetService () { return GetIOService (); }; |
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void Start () { StartIOService (); }; |
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void Stop () { StopIOService (); }; |
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}; |
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public: |
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SSU2Server (); |
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~SSU2Server () {}; |
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void Start (); |
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void Stop (); |
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boost::asio::io_service& GetService () { return GetIOService (); }; |
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void SetLocalAddress (const boost::asio::ip::address& localAddress); |
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bool SetProxy (const std::string& address, uint16_t port); |
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bool UsesProxy () const { return m_IsThroughProxy; }; |
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bool IsSupported (const boost::asio::ip::address& addr) const; |
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uint16_t GetPort (bool v4) const; |
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bool IsSyncClockFromPeers () const { return m_IsSyncClockFromPeers; }; |
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void AdjustTimeOffset (int64_t offset, std::shared_ptr<const i2p::data::IdentityEx> from); |
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void AddSession (std::shared_ptr<SSU2Session> session); |
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void RemoveSession (uint64_t connID); |
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void AddSessionByRouterHash (std::shared_ptr<SSU2Session> session); |
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bool AddPendingOutgoingSession (std::shared_ptr<SSU2Session> session); |
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void RemovePendingOutgoingSession (const boost::asio::ip::udp::endpoint& ep); |
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std::shared_ptr<SSU2Session> FindSession (const i2p::data::IdentHash& ident) const; |
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std::shared_ptr<SSU2Session> FindPendingOutgoingSession (const boost::asio::ip::udp::endpoint& ep) const; |
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std::shared_ptr<SSU2Session> GetRandomPeerTestSession (i2p::data::RouterInfo::CompatibleTransports remoteTransports, |
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const i2p::data::IdentHash& excluded) const; |
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void AddRelay (uint32_t tag, std::shared_ptr<SSU2Session> relay); |
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void RemoveRelay (uint32_t tag); |
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std::shared_ptr<SSU2Session> FindRelaySession (uint32_t tag); |
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void Send (const uint8_t * header, size_t headerLen, const uint8_t * payload, size_t payloadLen, |
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const boost::asio::ip::udp::endpoint& to); |
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void Send (const uint8_t * header, size_t headerLen, const uint8_t * headerX, size_t headerXLen, |
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const uint8_t * payload, size_t payloadLen, const boost::asio::ip::udp::endpoint& to); |
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bool CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router, |
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std::shared_ptr<const i2p::data::RouterInfo::Address> address, bool peerTest = false); |
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bool StartPeerTest (std::shared_ptr<const i2p::data::RouterInfo> router, bool v4); |
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void UpdateOutgoingToken (const boost::asio::ip::udp::endpoint& ep, uint64_t token, uint32_t exp); |
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uint64_t FindOutgoingToken (const boost::asio::ip::udp::endpoint& ep); |
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uint64_t GetIncomingToken (const boost::asio::ip::udp::endpoint& ep); |
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std::pair<uint64_t, uint32_t> NewIncomingToken (const boost::asio::ip::udp::endpoint& ep); |
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void RescheduleIntroducersUpdateTimer (); |
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void RescheduleIntroducersUpdateTimerV6 (); |
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i2p::util::MemoryPool<SSU2SentPacket>& GetSentPacketsPool () { return m_SentPacketsPool; }; |
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i2p::util::MemoryPool<SSU2IncompleteMessage>& GetIncompleteMessagesPool () { return m_IncompleteMessagesPool; }; |
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i2p::util::MemoryPool<SSU2IncompleteMessage::Fragment>& GetFragmentsPool () { return m_FragmentsPool; }; |
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private: |
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boost::asio::ip::udp::socket& OpenSocket (const boost::asio::ip::udp::endpoint& localEndpoint); |
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void Receive (boost::asio::ip::udp::socket& socket); |
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void HandleReceivedFrom (const boost::system::error_code& ecode, size_t bytes_transferred, |
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Packet * packet, boost::asio::ip::udp::socket& socket); |
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void HandleReceivedPacket (Packet * packet); |
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void HandleReceivedPackets (std::vector<Packet *> packets); |
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void ProcessNextPacket (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint); |
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void ScheduleTermination (); |
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void HandleTerminationTimer (const boost::system::error_code& ecode); |
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void ScheduleCleanup (); |
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void HandleCleanupTimer (const boost::system::error_code& ecode); |
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void ScheduleResend (bool more); |
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void HandleResendTimer (const boost::system::error_code& ecode); |
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void ConnectThroughIntroducer (std::shared_ptr<SSU2Session> session); |
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std::list<std::shared_ptr<SSU2Session> > FindIntroducers (int maxNumIntroducers, |
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bool v4, const std::set<i2p::data::IdentHash>& excluded) const; |
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void UpdateIntroducers (bool v4); |
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void ScheduleIntroducersUpdateTimer (); |
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void HandleIntroducersUpdateTimer (const boost::system::error_code& ecode, bool v4); |
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void ScheduleIntroducersUpdateTimerV6 (); |
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void SendThroughProxy (const uint8_t * header, size_t headerLen, const uint8_t * headerX, size_t headerXLen, |
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const uint8_t * payload, size_t payloadLen, const boost::asio::ip::udp::endpoint& to); |
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void ProcessNextPacketFromProxy (uint8_t * buf, size_t len); |
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void ConnectToProxy (); |
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void ReconnectToProxy (); |
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void HandshakeWithProxy (); |
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void ReadHandshakeWithProxyReply (); |
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void SendUDPAssociateRequest (); |
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void ReadUDPAssociateReply (); |
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void ReadUDPAssociateSocket (); // handle if closed by peer |
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private: |
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ReceiveService m_ReceiveService; |
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boost::asio::ip::udp::socket m_SocketV4, m_SocketV6; |
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boost::asio::ip::address m_AddressV4, m_AddressV6; |
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std::unordered_map<uint64_t, std::shared_ptr<SSU2Session> > m_Sessions; |
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std::unordered_map<i2p::data::IdentHash, std::shared_ptr<SSU2Session> > m_SessionsByRouterHash; |
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std::map<boost::asio::ip::udp::endpoint, std::shared_ptr<SSU2Session> > m_PendingOutgoingSessions; |
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mutable std::mutex m_PendingOutgoingSessionsMutex; |
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std::map<boost::asio::ip::udp::endpoint, std::pair<uint64_t, uint32_t> > m_IncomingTokens, m_OutgoingTokens; // remote endpoint -> (token, expires in seconds) |
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std::map<uint32_t, std::shared_ptr<SSU2Session> > m_Relays; // we are introducer, relay tag -> session |
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std::list<i2p::data::IdentHash> m_Introducers, m_IntroducersV6; // introducers we are connected to |
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i2p::util::MemoryPoolMt<Packet> m_PacketsPool; |
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i2p::util::MemoryPool<SSU2SentPacket> m_SentPacketsPool; |
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i2p::util::MemoryPool<SSU2IncompleteMessage> m_IncompleteMessagesPool; |
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i2p::util::MemoryPool<SSU2IncompleteMessage::Fragment> m_FragmentsPool; |
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boost::asio::deadline_timer m_TerminationTimer, m_CleanupTimer, m_ResendTimer, |
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m_IntroducersUpdateTimer, m_IntroducersUpdateTimerV6; |
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std::shared_ptr<SSU2Session> m_LastSession; |
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bool m_IsPublished; // if we maintain introducers |
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bool m_IsSyncClockFromPeers; |
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int64_t m_PendingTimeOffset; // during peer test |
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std::shared_ptr<const i2p::data::IdentityEx> m_PendingTimeOffsetFrom; |
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// proxy |
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bool m_IsThroughProxy; |
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uint8_t m_UDPRequestHeader[SOCKS5_UDP_IPV6_REQUEST_HEADER_SIZE]; |
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std::unique_ptr<boost::asio::ip::tcp::endpoint> m_ProxyEndpoint; |
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std::unique_ptr<boost::asio::ip::tcp::socket> m_UDPAssociateSocket; |
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std::unique_ptr<boost::asio::ip::udp::endpoint> m_ProxyRelayEndpoint; |
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std::unique_ptr<boost::asio::deadline_timer> m_ProxyConnectRetryTimer; |
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public: |
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// for HTTP/I2PControl |
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const decltype(m_Sessions)& GetSSU2Sessions () const { return m_Sessions; }; |
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}; |
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} |
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} |
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#endif
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