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I2P: End-to-End encrypted and anonymous Internet
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380 lines
14 KiB
380 lines
14 KiB
/* |
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* Copyright (c) 2013-2022, 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 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 <unordered_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 "Base.h" |
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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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#include "util.h" // MemoryPool |
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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 uint16_t PACKET_FLAG_OFFLINE_SIGNATURE = 0x0800; |
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const size_t STREAMING_MTU = 1730; |
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const size_t STREAMING_MTU_RATCHETS = 1812; |
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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 MAX_NUM_RESEND_ATTEMPTS = 6; |
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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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const int INITIAL_RTO = 9000; // in milliseconds |
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const int MIN_SEND_ACK_TIMEOUT = 2; // in milliseconds |
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const int SYN_TIMEOUT = 200; // how long we wait for SYN after follow-on, in milliseconds |
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const size_t MAX_PENDING_INCOMING_BACKLOG = 128; |
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const int PENDING_INCOMING_TIMEOUT = 10; // in seconds |
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const int MAX_RECEIVE_TIMEOUT = 20; // in seconds |
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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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uint64_t sendTime; |
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Packet (): len (0), offset (0), sendTime (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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bool IsEcho () const { return GetFlags () & PACKET_FLAG_ECHO; }; |
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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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typedef std::function<void (const boost::system::error_code& ecode)> SendHandler; |
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struct SendBuffer |
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{ |
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uint8_t * buf; |
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size_t len, offset; |
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SendHandler handler; |
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SendBuffer (const uint8_t * b, size_t l, SendHandler h): |
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len(l), offset (0), handler(h) |
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{ |
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buf = new uint8_t[len]; |
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memcpy (buf, b, len); |
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} |
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SendBuffer (size_t l): // create empty buffer |
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len(l), offset (0) |
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{ |
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buf = new uint8_t[len]; |
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} |
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~SendBuffer () |
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{ |
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delete[] buf; |
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if (handler) handler(boost::system::error_code ()); |
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} |
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size_t GetRemainingSize () const { return len - offset; }; |
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const uint8_t * GetRemaningBuffer () const { return buf + offset; }; |
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void Cancel () { if (handler) handler (boost::asio::error::make_error_code (boost::asio::error::operation_aborted)); handler = nullptr; }; |
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}; |
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class SendBufferQueue |
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{ |
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public: |
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SendBufferQueue (): m_Size (0) {}; |
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~SendBufferQueue () { CleanUp (); }; |
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void Add (const uint8_t * buf, size_t len, SendHandler handler); |
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void Add (std::shared_ptr<SendBuffer> buf); |
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size_t Get (uint8_t * buf, size_t len); |
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size_t GetSize () const { return m_Size; }; |
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bool IsEmpty () const { return m_Buffers.empty (); }; |
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void CleanUp (); |
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private: |
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std::list<std::shared_ptr<SendBuffer> > m_Buffers; |
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size_t m_Size; |
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}; |
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enum StreamStatus |
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{ |
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eStreamStatusNew = 0, |
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eStreamStatusOpen, |
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eStreamStatusReset, |
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eStreamStatusClosing, |
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eStreamStatusClosed, |
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eStreamStatusTerminated |
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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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std::shared_ptr<const i2p::data::IdentityEx> GetRemoteIdentity () const { return m_RemoteIdentity; }; |
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bool IsOpen () const { return m_Status == eStreamStatusOpen; }; |
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bool IsEstablished () const { return m_SendStreamID; }; |
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StreamStatus GetStatus () const { return m_Status; }; |
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StreamingDestination& GetLocalDestination () { return m_LocalDestination; }; |
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void HandleNextPacket (Packet * packet); |
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void HandlePing (Packet * packet); |
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size_t Send (const uint8_t * buf, size_t len); |
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void AsyncSend (const uint8_t * buf, size_t len, SendHandler handler); |
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void SendPing (); |
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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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size_t Receive (uint8_t * buf, size_t len, int timeout); |
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void AsyncClose() { m_Service.post(std::bind(&Stream::Close, shared_from_this())); }; |
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/** only call close from destination thread, use Stream::AsyncClose for other threads */ |
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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.GetSize (); }; |
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int GetWindowSize () const { return m_WindowSize; }; |
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int GetRTT () const { return m_RTT; }; |
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void Terminate (bool deleteFromDestination = true); |
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private: |
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void CleanUp (); |
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void SendBuffer (); |
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void SendQuickAck (); |
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void SendClose (); |
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bool SendPacket (Packet * packet); |
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void SendPackets (const std::vector<Packet *>& packets); |
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void SendUpdatedLeaseSet (); |
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void SavePacket (Packet * packet); |
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void ProcessPacket (Packet * packet); |
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bool ProcessOptions (uint16_t flags, 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 (bool expired = false); |
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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, int remainingTimeout); |
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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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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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StreamStatus m_Status; |
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bool m_IsAckSendScheduled; |
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StreamingDestination& m_LocalDestination; |
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std::shared_ptr<const i2p::data::IdentityEx> m_RemoteIdentity; |
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std::shared_ptr<const i2p::crypto::Verifier> m_TransientVerifier; // in case of offline key |
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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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std::shared_ptr<const 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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SendBufferQueue m_SendBuffer; |
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int m_WindowSize, m_RTT, m_RTO, m_AckDelay; |
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uint64_t m_LastWindowSizeIncreaseTime; |
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int m_NumResendAttempts; |
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size_t m_MTU; |
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}; |
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class StreamingDestination: public std::enable_shared_from_this<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 (std::shared_ptr<i2p::client::ClientDestination> owner, uint16_t localPort = 0, bool gzip = false); |
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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 SendPing (std::shared_ptr<const i2p::data::LeaseSet> remote); |
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void DeleteStream (std::shared_ptr<Stream> stream); |
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bool DeleteStream (uint32_t recvStreamID); |
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void SetAcceptor (const Acceptor& acceptor); |
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void ResetAcceptor (); |
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bool IsAcceptorSet () const { return m_Acceptor != nullptr; }; |
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void AcceptOnce (const Acceptor& acceptor); |
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void AcceptOnceAcceptor (std::shared_ptr<Stream> stream, Acceptor acceptor, Acceptor prev); |
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std::shared_ptr<Stream> AcceptStream (int timeout = 0); // sync |
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std::shared_ptr<i2p::client::ClientDestination> GetOwner () const { return m_Owner; }; |
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void SetOwner (std::shared_ptr<i2p::client::ClientDestination> owner) { m_Owner = owner; }; |
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uint16_t GetLocalPort () const { return m_LocalPort; }; |
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void HandleDataMessagePayload (const uint8_t * buf, size_t len); |
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std::shared_ptr<I2NPMessage> CreateDataMessage (const uint8_t * payload, size_t len, uint16_t toPort, bool checksum = true, bool gzip = false); |
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Packet * NewPacket () { return m_PacketsPool.Acquire(); } |
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void DeletePacket (Packet * p) { return m_PacketsPool.Release(p); } |
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private: |
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void HandleNextPacket (Packet * packet); |
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std::shared_ptr<Stream> CreateNewIncomingStream (uint32_t receiveStreamID); |
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void HandlePendingIncomingTimer (const boost::system::error_code& ecode); |
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private: |
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std::shared_ptr<i2p::client::ClientDestination> m_Owner; |
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uint16_t m_LocalPort; |
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bool m_Gzip; // gzip compression of data messages |
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std::mutex m_StreamsMutex; |
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std::unordered_map<uint32_t, std::shared_ptr<Stream> > m_Streams; // sendStreamID->stream |
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std::unordered_map<uint32_t, std::shared_ptr<Stream> > m_IncomingStreams; // receiveStreamID->stream |
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std::shared_ptr<Stream> m_LastStream; |
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Acceptor m_Acceptor; |
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std::list<std::shared_ptr<Stream> > m_PendingIncomingStreams; |
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boost::asio::deadline_timer m_PendingIncomingTimer; |
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std::unordered_map<uint32_t, std::list<Packet *> > m_SavedPackets; // receiveStreamID->packets, arrived before SYN |
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i2p::util::MemoryPool<Packet> m_PacketsPool; |
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i2p::util::MemoryPool<I2NPMessageBuffer<I2NP_MAX_MESSAGE_SIZE> > m_I2NPMsgsPool; |
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public: |
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i2p::data::GzipInflator m_Inflator; |
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i2p::data::GzipDeflator m_Deflator; |
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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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auto s = shared_from_this(); |
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m_Service.post ([s, buffer, handler, timeout](void) |
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{ |
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if (!s->m_ReceiveQueue.empty () || s->m_Status == eStreamStatusReset) |
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s->HandleReceiveTimer (boost::asio::error::make_error_code (boost::asio::error::operation_aborted), buffer, handler, 0); |
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else |
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{ |
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int t = (timeout > MAX_RECEIVE_TIMEOUT) ? MAX_RECEIVE_TIMEOUT : timeout; |
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s->m_ReceiveTimer.expires_from_now (boost::posix_time::seconds(t)); |
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int left = timeout - t; |
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s->m_ReceiveTimer.async_wait ( |
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[s, buffer, handler, left](const boost::system::error_code & ec) |
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{ |
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s->HandleReceiveTimer(ec, buffer, handler, left); |
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}); |
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} |
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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, int remainingTimeout) |
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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 (received > 0) |
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handler (boost::system::error_code (), received); |
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else if (ecode == boost::asio::error::operation_aborted) |
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{ |
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// timeout not expired |
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if (m_Status == eStreamStatusReset) |
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handler (boost::asio::error::make_error_code (boost::asio::error::connection_reset), 0); |
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else |
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handler (boost::asio::error::make_error_code (boost::asio::error::operation_aborted), 0); |
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} |
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else |
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{ |
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// timeout expired |
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if (remainingTimeout <= 0) |
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handler (boost::asio::error::make_error_code (boost::asio::error::timed_out), received); |
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else |
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{ |
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// itermediate interrupt |
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SendUpdatedLeaseSet (); // send our leaseset if applicable |
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AsyncReceive (buffer, handler, remainingTimeout); |
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} |
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} |
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} |
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} |
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} |
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#endif
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