mirror of
https://github.com/PurpleI2P/i2pd
synced 2024-11-08 23:40:12 +03:00
220 lines
10 KiB
C++
220 lines
10 KiB
C++
/*
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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 <unordered_set>
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#include <vector>
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#include <list>
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#include <array>
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#include <mutex>
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#include <random>
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#include "util.h"
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#include "SSU2Session.h"
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#include "SSU2OutOfSession.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 = 23; // in seconds
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const int SSU2_TERMINATION_CHECK_TIMEOUT_VARIANCE = 5; // 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 = 4; // in milliseconds
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const int SSU2_RESEND_CHECK_MORE_TIMEOUT_VARIANCE = 9; // 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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const int SSU2_MIN_HOLE_PUNCH_EXPIRATION = 30; // in seconds
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const int SSU2_MAX_HOLE_PUNCH_EXPIRATION = 160; // in seconds
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const size_t SSU2_MAX_NUM_PACKETS_PER_BATCH = 64;
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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 IsConnectedRecently (const boost::asio::ip::udp::endpoint& ep, bool max = true);
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void AddConnectedRecently (const boost::asio::ip::udp::endpoint& ep, uint64_t ts);
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std::mt19937& GetRng () { return m_Rng; }
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bool IsMaxNumIntroducers (bool v4) const { return (v4 ? m_Introducers.size () : m_IntroducersV6.size ()) >= SSU2_MAX_NUM_INTRODUCERS; }
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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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bool AddSession (std::shared_ptr<SSU2Session> session);
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void RemoveSession (uint64_t connID);
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void RequestRemoveSession (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);
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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);
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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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bool AddPeerTest (uint32_t nonce, std::shared_ptr<SSU2Session> aliceSession, uint64_t ts);
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std::shared_ptr<SSU2Session> GetPeerTest (uint32_t nonce);
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bool AddRequestedPeerTest (uint32_t nonce, std::shared_ptr<SSU2PeerTestSession> session, uint64_t ts);
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std::shared_ptr<SSU2PeerTestSession> GetRequestedPeerTest (uint32_t nonce);
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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 HandleReceivedPackets (std::list<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 InsertToReceivedPacketsQueue (Packet * packet);
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void InsertToReceivedPacketsQueue (std::list<Packet *>& packets);
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void HandleReceivedPacketsQueue ();
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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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bool CheckPendingOutgoingSession (const boost::asio::ip::udp::endpoint& ep, bool peerTest);
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void ConnectThroughIntroducer (std::shared_ptr<SSU2Session> session);
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std::vector<std::shared_ptr<SSU2Session> > FindIntroducers (int maxNumIntroducers,
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bool v4, const std::unordered_set<i2p::data::IdentHash>& excluded);
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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::weak_ptr<SSU2Session> > m_SessionsByRouterHash;
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mutable std::mutex m_SessionsByRouterHashMutex;
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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::unordered_map<uint32_t, std::weak_ptr<SSU2Session> > m_Relays; // we are introducer, relay tag -> session
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std::unordered_map<uint32_t, std::pair <std::weak_ptr<SSU2Session>, uint64_t > > m_PeerTests; // nonce->(Alice, timestamp). We are Bob
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std::list<std::pair<i2p::data::IdentHash, uint32_t> > 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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std::mt19937 m_Rng;
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std::map<boost::asio::ip::udp::endpoint, uint64_t> m_ConnectedRecently; // endpoint -> last activity time in seconds
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mutable std::mutex m_ConnectedRecentlyMutex;
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std::unordered_map<uint32_t, std::pair <std::weak_ptr<SSU2PeerTestSession>, uint64_t > > m_RequestedPeerTests; // nonce->(Alice, timestamp)
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std::list<Packet *> m_ReceivedPacketsQueue;
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mutable std::mutex m_ReceivedPacketsQueueMutex;
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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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