I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
 
 
 
 
 

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/*
* Copyright (c) 2013-2021, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#ifndef TUNNEL_ENDPOINT_H__
#define TUNNEL_ENDPOINT_H__
#include <inttypes.h>
#include <vector>
#include <string>
#include <unordered_map>
#include "I2NPProtocol.h"
#include "TunnelBase.h"
namespace i2p
{
namespace tunnel
{
class TunnelEndpoint
{
struct TunnelMessageBlockEx: public TunnelMessageBlock
{
uint64_t receiveTime; // milliseconds since epoch
uint8_t nextFragmentNum;
};
struct Fragment
{
Fragment (bool last, uint64_t t, size_t size): isLastFragment (last), receiveTime (t), data (size) {};
bool isLastFragment;
uint64_t receiveTime; // milliseconds since epoch
std::vector<uint8_t> data;
};
public:
TunnelEndpoint (bool isInbound): m_IsInbound (isInbound), m_NumReceivedBytes (0), m_CurrentMsgID (0) {};
~TunnelEndpoint ();
size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; };
void Cleanup ();
void HandleDecryptedTunnelDataMsg (std::shared_ptr<I2NPMessage> msg);
private:
void HandleFollowOnFragment (uint32_t msgID, bool isLastFragment, uint8_t fragmentNum, const uint8_t * fragment, size_t size);
bool ConcatFollowOnFragment (TunnelMessageBlockEx& msg, const uint8_t * fragment, size_t size) const; // true if success
void HandleCurrenMessageFollowOnFragment (const uint8_t * fragment, size_t size, bool isLastFragment);
void HandleNextMessage (const TunnelMessageBlock& msg);
void AddOutOfSequenceFragment (uint32_t msgID, uint8_t fragmentNum, bool isLastFragment, const uint8_t * fragment, size_t size);
bool ConcatNextOutOfSequenceFragment (uint32_t msgID, TunnelMessageBlockEx& msg); // true if something added
void HandleOutOfSequenceFragments (uint32_t msgID, TunnelMessageBlockEx& msg);
void AddIncompleteCurrentMessage ();
private:
std::unordered_map<uint32_t, TunnelMessageBlockEx> m_IncompleteMessages;
std::unordered_map<uint64_t, std::unique_ptr<Fragment> > m_OutOfSequenceFragments; // ((msgID << 8) + fragment#)->fragment
bool m_IsInbound;
size_t m_NumReceivedBytes;
TunnelMessageBlockEx m_CurrentMessage;
uint32_t m_CurrentMsgID;
};
}
}
#endif