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I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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260 lines
8.9 KiB
260 lines
8.9 KiB
#ifndef STREAMING_H__ |
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#define STREAMING_H__ |
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#include <inttypes.h> |
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#include <string> |
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#include <sstream> |
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#include <map> |
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#include <set> |
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#include <queue> |
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#include <functional> |
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#include <memory> |
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#include <mutex> |
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#include <boost/asio.hpp> |
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#include "I2PEndian.h" |
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#include "Identity.h" |
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#include "LeaseSet.h" |
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#include "I2NPProtocol.h" |
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#include "Garlic.h" |
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#include "Tunnel.h" |
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namespace i2p |
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{ |
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namespace client |
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{ |
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class ClientDestination; |
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} |
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namespace stream |
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{ |
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const uint16_t PACKET_FLAG_SYNCHRONIZE = 0x0001; |
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const uint16_t PACKET_FLAG_CLOSE = 0x0002; |
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const uint16_t PACKET_FLAG_RESET = 0x0004; |
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const uint16_t PACKET_FLAG_SIGNATURE_INCLUDED = 0x0008; |
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const uint16_t PACKET_FLAG_SIGNATURE_REQUESTED = 0x0010; |
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const uint16_t PACKET_FLAG_FROM_INCLUDED = 0x0020; |
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const uint16_t PACKET_FLAG_DELAY_REQUESTED = 0x0040; |
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const uint16_t PACKET_FLAG_MAX_PACKET_SIZE_INCLUDED = 0x0080; |
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const uint16_t PACKET_FLAG_PROFILE_INTERACTIVE = 0x0100; |
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const uint16_t PACKET_FLAG_ECHO = 0x0200; |
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const uint16_t PACKET_FLAG_NO_ACK = 0x0400; |
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const size_t STREAMING_MTU = 1730; |
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const size_t MAX_PACKET_SIZE = 4096; |
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const size_t COMPRESSION_THRESHOLD_SIZE = 66; |
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const int RESEND_TIMEOUT = 10; // in seconds |
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const int ACK_SEND_TIMEOUT = 200; // in milliseconds |
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const int MAX_NUM_RESEND_ATTEMPTS = 5; |
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const int WINDOW_SIZE = 6; // in messages |
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const int MIN_WINDOW_SIZE = 1; |
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const int MAX_WINDOW_SIZE = 128; |
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const int INITIAL_RTT = 8000; // in milliseconds |
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struct Packet |
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{ |
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size_t len, offset; |
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uint8_t buf[MAX_PACKET_SIZE]; |
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int numResendAttempts; |
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Packet (): len (0), offset (0), numResendAttempts (0) {}; |
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uint8_t * GetBuffer () { return buf + offset; }; |
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size_t GetLength () const { return len - offset; }; |
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uint32_t GetSendStreamID () const { return bufbe32toh (buf); }; |
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uint32_t GetReceiveStreamID () const { return bufbe32toh (buf + 4); }; |
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uint32_t GetSeqn () const { return bufbe32toh (buf + 8); }; |
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uint32_t GetAckThrough () const { return bufbe32toh (buf + 12); }; |
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uint8_t GetNACKCount () const { return buf[16]; }; |
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uint32_t GetNACK (int i) const { return bufbe32toh (buf + 17 + 4 * i); }; |
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const uint8_t * GetOption () const { return buf + 17 + GetNACKCount ()*4 + 3; }; // 3 = resendDelay + flags |
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uint16_t GetFlags () const { return bufbe16toh (GetOption () - 2); }; |
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uint16_t GetOptionSize () const { return bufbe16toh (GetOption ()); }; |
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const uint8_t * GetOptionData () const { return GetOption () + 2; }; |
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const uint8_t * GetPayload () const { return GetOptionData () + GetOptionSize (); }; |
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bool IsSYN () const { return GetFlags () & PACKET_FLAG_SYNCHRONIZE; }; |
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bool IsNoAck () const { return GetFlags () & PACKET_FLAG_NO_ACK; }; |
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}; |
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struct PacketCmp |
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{ |
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bool operator() (const Packet * p1, const Packet * p2) const |
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{ |
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return p1->GetSeqn () < p2->GetSeqn (); |
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}; |
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}; |
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class StreamingDestination; |
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class Stream: public std::enable_shared_from_this<Stream> |
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{ |
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public: |
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Stream (boost::asio::io_service& service, StreamingDestination& local, |
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std::shared_ptr<const i2p::data::LeaseSet> remote, int port = 0); // outgoing |
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Stream (boost::asio::io_service& service, StreamingDestination& local); // incoming |
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~Stream (); |
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uint32_t GetSendStreamID () const { return m_SendStreamID; }; |
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uint32_t GetRecvStreamID () const { return m_RecvStreamID; }; |
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std::shared_ptr<const i2p::data::LeaseSet> GetRemoteLeaseSet () const { return m_RemoteLeaseSet; }; |
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const i2p::data::IdentityEx& GetRemoteIdentity () const { return m_RemoteIdentity; }; |
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bool IsOpen () const { return m_IsOpen; }; |
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bool IsEstablished () const { return m_SendStreamID; }; |
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StreamingDestination& GetLocalDestination () { return m_LocalDestination; }; |
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void HandleNextPacket (Packet * packet); |
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size_t Send (const uint8_t * buf, size_t len); |
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template<typename Buffer, typename ReceiveHandler> |
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void AsyncReceive (const Buffer& buffer, ReceiveHandler handler, int timeout = 0); |
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size_t ReadSome (uint8_t * buf, size_t len) { return ConcatenatePackets (buf, len); }; |
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void Close (); |
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void Cancel () { m_ReceiveTimer.cancel (); }; |
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size_t GetNumSentBytes () const { return m_NumSentBytes; }; |
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size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; }; |
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size_t GetSendQueueSize () const { return m_SentPackets.size (); }; |
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size_t GetReceiveQueueSize () const { return m_ReceiveQueue.size (); }; |
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size_t GetSendBufferSize () const { return m_SendBuffer.rdbuf ()->in_avail (); }; |
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private: |
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void SendBuffer (); |
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void SendQuickAck (); |
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bool SendPacket (Packet * packet); |
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void SendPackets (const std::vector<Packet *>& packets); |
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void SavePacket (Packet * packet); |
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void ProcessPacket (Packet * packet); |
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void ProcessAck (Packet * packet); |
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size_t ConcatenatePackets (uint8_t * buf, size_t len); |
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void UpdateCurrentRemoteLease (); |
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template<typename Buffer, typename ReceiveHandler> |
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void HandleReceiveTimer (const boost::system::error_code& ecode, const Buffer& buffer, ReceiveHandler handler); |
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void ScheduleResend (); |
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void HandleResendTimer (const boost::system::error_code& ecode); |
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void HandleAckSendTimer (const boost::system::error_code& ecode); |
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I2NPMessage * CreateDataMessage (const uint8_t * payload, size_t len); |
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private: |
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boost::asio::io_service& m_Service; |
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uint32_t m_SendStreamID, m_RecvStreamID, m_SequenceNumber; |
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int32_t m_LastReceivedSequenceNumber; |
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bool m_IsOpen, m_IsReset, m_IsAckSendScheduled; |
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StreamingDestination& m_LocalDestination; |
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i2p::data::IdentityEx m_RemoteIdentity; |
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std::shared_ptr<const i2p::data::LeaseSet> m_RemoteLeaseSet; |
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std::shared_ptr<i2p::garlic::GarlicRoutingSession> m_RoutingSession; |
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i2p::data::Lease m_CurrentRemoteLease; |
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std::shared_ptr<i2p::tunnel::OutboundTunnel> m_CurrentOutboundTunnel; |
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std::queue<Packet *> m_ReceiveQueue; |
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std::set<Packet *, PacketCmp> m_SavedPackets; |
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std::set<Packet *, PacketCmp> m_SentPackets; |
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boost::asio::deadline_timer m_ReceiveTimer, m_ResendTimer, m_AckSendTimer; |
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size_t m_NumSentBytes, m_NumReceivedBytes; |
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uint16_t m_Port; |
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std::mutex m_SendBufferMutex; |
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std::stringstream m_SendBuffer; |
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int m_WindowSize; |
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uint64_t m_LastWindowSizeIncreaseTime; |
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}; |
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class StreamingDestination |
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{ |
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public: |
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typedef std::function<void (std::shared_ptr<Stream>)> Acceptor; |
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StreamingDestination (i2p::client::ClientDestination& owner): m_Owner (owner) {}; |
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~StreamingDestination () {}; |
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void Start (); |
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void Stop (); |
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std::shared_ptr<Stream> CreateNewOutgoingStream (std::shared_ptr<const i2p::data::LeaseSet> remote, int port = 0); |
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void DeleteStream (std::shared_ptr<Stream> stream); |
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void SetAcceptor (const Acceptor& acceptor) { m_Acceptor = acceptor; }; |
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void ResetAcceptor () { m_Acceptor = nullptr; }; |
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bool IsAcceptorSet () const { return m_Acceptor != nullptr; }; |
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i2p::client::ClientDestination& GetOwner () { return m_Owner; }; |
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void HandleDataMessagePayload (const uint8_t * buf, size_t len); |
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private: |
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void HandleNextPacket (Packet * packet); |
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std::shared_ptr<Stream> CreateNewIncomingStream (); |
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private: |
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i2p::client::ClientDestination& m_Owner; |
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std::mutex m_StreamsMutex; |
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std::map<uint32_t, std::shared_ptr<Stream> > m_Streams; |
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Acceptor m_Acceptor; |
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public: |
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// for HTTP only |
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const decltype(m_Streams)& GetStreams () const { return m_Streams; }; |
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}; |
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//------------------------------------------------- |
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template<typename Buffer, typename ReceiveHandler> |
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void Stream::AsyncReceive (const Buffer& buffer, ReceiveHandler handler, int timeout) |
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{ |
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if (!m_ReceiveQueue.empty ()) |
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{ |
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auto s = shared_from_this(); |
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m_Service.post ([=](void) { s->HandleReceiveTimer ( |
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boost::asio::error::make_error_code (boost::asio::error::operation_aborted), |
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buffer, handler); }); |
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} |
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else |
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{ |
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m_ReceiveTimer.expires_from_now (boost::posix_time::seconds(timeout)); |
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auto s = shared_from_this(); |
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m_ReceiveTimer.async_wait ([=](const boost::system::error_code& ecode) |
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{ s->HandleReceiveTimer (ecode, buffer, handler); }); |
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} |
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} |
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template<typename Buffer, typename ReceiveHandler> |
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void Stream::HandleReceiveTimer (const boost::system::error_code& ecode, const Buffer& buffer, ReceiveHandler handler) |
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{ |
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size_t received = ConcatenatePackets (boost::asio::buffer_cast<uint8_t *>(buffer), boost::asio::buffer_size(buffer)); |
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if (ecode == boost::asio::error::operation_aborted) |
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{ |
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// timeout not expired |
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if (m_IsOpen) |
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// no error |
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handler (boost::system::error_code (), received); |
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else |
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{ |
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// stream closed |
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if (m_IsReset) |
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{ |
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// stream closed by peer |
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handler (received > 0 ? boost::system::error_code () : // we still have some data |
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boost::asio::error::make_error_code (boost::asio::error::connection_reset), // no more data |
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received); |
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} |
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else // stream closed by us |
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handler (boost::asio::error::make_error_code (boost::asio::error::operation_aborted), received); |
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} |
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} |
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else |
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// timeout expired |
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handler (boost::asio::error::make_error_code (boost::asio::error::timed_out), received); |
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} |
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} |
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} |
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#endif
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