mirror of
https://github.com/PurpleI2P/i2pd.git
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272 lines
11 KiB
C++
272 lines
11 KiB
C++
#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 ACK_SEND_TIMEOUT = 200; // in milliseconds
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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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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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};
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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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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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};
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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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typedef std::function<void (const boost::system::error_code& ecode)> SendHandler;
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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_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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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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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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int GetWindowSize () const { return m_WindowSize; };
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int GetRTT () const { return m_RTT; };
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private:
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void Terminate ();
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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 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 (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);
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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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std::shared_ptr<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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StreamStatus m_Status;
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bool 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, m_RTT, m_RTO;
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uint64_t m_LastWindowSizeIncreaseTime;
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int m_NumResendAttempts;
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SendHandler m_SendHandler;
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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, uint16_t localPort = 0):
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m_Owner (owner), m_LocalPort (localPort) {};
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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 () { if (m_Acceptor) m_Acceptor (nullptr); 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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uint16_t GetLocalPort () const { return m_LocalPort; };
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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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uint16_t m_LocalPort;
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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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auto s = shared_from_this();
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m_Service.post ([=](void)
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{
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if (!m_ReceiveQueue.empty () || m_Status == eStreamStatusReset)
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s->HandleReceiveTimer (boost::asio::error::make_error_code (boost::asio::error::operation_aborted), buffer, handler);
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else
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{
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s->m_ReceiveTimer.expires_from_now (boost::posix_time::seconds(timeout));
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s->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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}
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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 (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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// 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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