mirror of
https://github.com/PurpleI2P/i2pd
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73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
/*
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* Copyright (c) 2013-2021, 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 TUNNEL_ENDPOINT_H__
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#define TUNNEL_ENDPOINT_H__
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#include <inttypes.h>
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#include <vector>
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#include <string>
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#include <unordered_map>
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#include "I2NPProtocol.h"
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#include "TunnelBase.h"
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namespace i2p
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{
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namespace tunnel
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{
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class TunnelEndpoint
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{
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struct TunnelMessageBlockEx: public TunnelMessageBlock
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{
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uint64_t receiveTime; // milliseconds since epoch
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uint8_t nextFragmentNum;
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};
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struct Fragment
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{
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Fragment (bool last, uint64_t t, size_t size): isLastFragment (last), receiveTime (t), data (size) {};
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bool isLastFragment;
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uint64_t receiveTime; // milliseconds since epoch
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std::vector<uint8_t> data;
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};
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public:
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TunnelEndpoint (bool isInbound): m_IsInbound (isInbound), m_NumReceivedBytes (0), m_CurrentMsgID (0) {};
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~TunnelEndpoint ();
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size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; };
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void Cleanup ();
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void HandleDecryptedTunnelDataMsg (std::shared_ptr<I2NPMessage> msg);
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private:
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void HandleFollowOnFragment (uint32_t msgID, bool isLastFragment, uint8_t fragmentNum, const uint8_t * fragment, size_t size);
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bool ConcatFollowOnFragment (TunnelMessageBlockEx& msg, const uint8_t * fragment, size_t size) const; // true if success
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void HandleCurrenMessageFollowOnFragment (const uint8_t * fragment, size_t size, bool isLastFragment);
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void HandleNextMessage (const TunnelMessageBlock& msg);
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void AddOutOfSequenceFragment (uint32_t msgID, uint8_t fragmentNum, bool isLastFragment, const uint8_t * fragment, size_t size);
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bool ConcatNextOutOfSequenceFragment (uint32_t msgID, TunnelMessageBlockEx& msg); // true if something added
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void HandleOutOfSequenceFragments (uint32_t msgID, TunnelMessageBlockEx& msg);
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void AddIncompleteCurrentMessage ();
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private:
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std::unordered_map<uint32_t, TunnelMessageBlockEx> m_IncompleteMessages;
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std::unordered_map<uint64_t, std::unique_ptr<Fragment> > m_OutOfSequenceFragments; // ((msgID << 8) + fragment#)->fragment
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bool m_IsInbound;
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size_t m_NumReceivedBytes;
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TunnelMessageBlockEx m_CurrentMessage;
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uint32_t m_CurrentMsgID;
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};
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}
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}
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#endif
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