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

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#ifndef TUNNEL_ENDPOINT_H__
#define TUNNEL_ENDPOINT_H__
#include <inttypes.h>
#include <map>
#include <string>
#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
{
bool isLastFragment;
std::shared_ptr<I2NPMessage> data;
uint64_t receiveTime; // milliseconds since epoch
};
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public:
TunnelEndpoint (bool isInbound): m_IsInbound (isInbound), m_NumReceivedBytes (0) {};
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~TunnelEndpoint ();
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size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; };
void Cleanup ();
void HandleDecryptedTunnelDataMsg (std::shared_ptr<I2NPMessage> msg);
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private:
void HandleFollowOnFragment (uint32_t msgID, bool isLastFragment, const TunnelMessageBlockEx& m);
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void HandleNextMessage (const TunnelMessageBlock& msg);
void AddOutOfSequenceFragment (uint32_t msgID, uint8_t fragmentNum, bool isLastFragment, std::shared_ptr<I2NPMessage> data);
bool ConcatNextOutOfSequenceFragment (uint32_t msgID, TunnelMessageBlockEx& msg); // true if something added
void HandleOutOfSequenceFragments (uint32_t msgID, TunnelMessageBlockEx& msg);
private:
std::map<uint32_t, TunnelMessageBlockEx> m_IncompleteMessages;
std::map<std::pair<uint32_t, uint8_t>, Fragment> m_OutOfSequenceFragments; // (msgID, fragment#)->fragment
bool m_IsInbound;
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size_t m_NumReceivedBytes;
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};
}
}
#endif