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262 lines
8.9 KiB
C++
262 lines
8.9 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 <map>
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#include <set>
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#include <queue>
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#include <thread>
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#include <functional>
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#include <boost/asio.hpp>
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#include <boost/bind.hpp>
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#include <cryptopp/dsa.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 "TunnelPool.h"
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namespace i2p
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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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struct Packet
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{
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uint8_t buf[MAX_PACKET_SIZE];
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size_t len, offset;
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Packet (): len (0), offset (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 be32toh (*(uint32_t *)buf); };
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uint32_t GetReceiveStreamID () const { return be32toh (*(uint32_t *)(buf + 4)); };
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uint32_t GetSeqn () const { return be32toh (*(uint32_t *)(buf + 8)); };
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uint32_t GetAckThrough () const { return be32toh (*(uint32_t *)(buf + 12)); };
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uint8_t GetNACKCount () const { return buf[16]; };
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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 be16toh (*(uint16_t *)(GetOption () - 2)); };
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uint16_t GetOptionSize () const { return be16toh (*(uint16_t *)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
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{
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public:
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Stream (boost::asio::io_service& service, StreamingDestination * local, const i2p::data::LeaseSet& remote); // 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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const i2p::data::LeaseSet * GetRemoteLeaseSet () const { return m_RemoteLeaseSet; };
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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, int timeout); // timeout in seconds
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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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void Close ();
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void SetLeaseSetUpdated () { m_LeaseSetUpdated = true; };
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private:
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void SendQuickAck ();
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bool SendPacket (Packet * packet);
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bool SendPacket (const uint8_t * buf, size_t len);
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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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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_LeaseSetUpdated;
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StreamingDestination * m_LocalDestination;
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i2p::data::Identity m_RemoteIdentity;
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const i2p::data::LeaseSet * m_RemoteLeaseSet;
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i2p::data::Lease m_CurrentRemoteLease;
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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;
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};
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class StreamingDestination: public i2p::data::LocalDestination
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{
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public:
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StreamingDestination (boost::asio::io_service& service);
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StreamingDestination (boost::asio::io_service& service, const std::string& fullPath);
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~StreamingDestination ();
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const i2p::data::PrivateKeys& GetKeys () const { return m_Keys; };
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I2NPMessage * GetLeaseSetMsg ();
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const i2p::data::LeaseSet * GetLeaseSet ();
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i2p::tunnel::TunnelPool * GetTunnelPool () const { return m_Pool; };
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Stream * CreateNewOutgoingStream (const i2p::data::LeaseSet& remote);
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void DeleteStream (Stream * stream);
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void SetAcceptor (const std::function<void (Stream *)>& acceptor) { m_Acceptor = acceptor; };
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void HandleNextPacket (Packet * packet);
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// implements LocalDestination
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const i2p::data::IdentHash& GetIdentHash () const { return m_IdentHash; };
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const i2p::data::Identity& GetIdentity () const { return m_Keys.pub; };
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const uint8_t * GetEncryptionPrivateKey () const { return m_EncryptionPrivateKey; };
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const uint8_t * GetEncryptionPublicKey () const { return m_EncryptionPublicKey; };
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void Sign (const uint8_t * buf, int len, uint8_t * signature) const;
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private:
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Stream * CreateNewIncomingStream ();
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private:
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boost::asio::io_service& m_Service;
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std::map<uint32_t, Stream *> m_Streams;
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i2p::data::PrivateKeys m_Keys;
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i2p::data::IdentHash m_IdentHash;
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uint8_t m_EncryptionPublicKey[256], m_EncryptionPrivateKey[256];
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i2p::tunnel::TunnelPool * m_Pool;
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i2p::data::LeaseSet * m_LeaseSet;
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CryptoPP::DSA::PrivateKey m_SigningPrivateKey;
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std::function<void (Stream *)> m_Acceptor;
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};
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class StreamingDestinations
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{
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public:
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StreamingDestinations (): m_IsRunning (false), m_Thread (nullptr),
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m_Work (m_Service), m_SharedLocalDestination (nullptr) {};
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~StreamingDestinations () {};
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void Start ();
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void Stop ();
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void HandleNextPacket (i2p::data::IdentHash destination, Packet * packet);
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Stream * CreateClientStream (const i2p::data::LeaseSet& remote);
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void DeleteStream (Stream * stream);
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StreamingDestination * GetSharedLocalDestination () const { return m_SharedLocalDestination; };
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private:
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void Run ();
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void LoadLocalDestinations ();
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void PostNextPacket (i2p::data::IdentHash destination, Packet * packet);
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private:
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bool m_IsRunning;
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std::thread * m_Thread;
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boost::asio::io_service m_Service;
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boost::asio::io_service::work m_Work;
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std::map<i2p::data::IdentHash, StreamingDestination *> m_Destinations;
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StreamingDestination * m_SharedLocalDestination;
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};
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Stream * CreateStream (const i2p::data::LeaseSet& remote);
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void DeleteStream (Stream * stream);
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void StartStreaming ();
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void StopStreaming ();
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StreamingDestination * GetSharedLocalDestination ();
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// assuming data is I2CP message
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void HandleDataMessage (i2p::data::IdentHash destination, const uint8_t * buf, size_t len);
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I2NPMessage * CreateDataMessage (Stream * s, const uint8_t * payload, size_t len);
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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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size_t received = ConcatenatePackets (boost::asio::buffer_cast<uint8_t *>(buffer), boost::asio::buffer_size(buffer));
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if (received)
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{
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// TODO: post to stream's thread
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handler (boost::system::error_code (), received);
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return;
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}
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}
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if (!m_IsOpen)
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{
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handler (boost::asio::error::make_error_code (boost::asio::error::connection_reset), 0);
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return;
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}
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m_ReceiveTimer.expires_from_now (boost::posix_time::seconds(timeout));
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m_ReceiveTimer.async_wait ([=](const boost::system::error_code& ecode)
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{ this->HandleReceiveTimer (ecode, buffer, handler); });
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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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// timeout not expired
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handler (boost::system::error_code (), received);
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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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