I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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/*
* Copyright (c) 2013-2024, 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 TRANSIT_TUNNEL_H__
#define TRANSIT_TUNNEL_H__
#include <inttypes.h>
#include <list>
#include <mutex>
#include <memory>
#include "Crypto.h"
#include "I2NPProtocol.h"
#include "TunnelEndpoint.h"
#include "TunnelGateway.h"
#include "TunnelBase.h"
namespace i2p
{
namespace tunnel
{
class TransitTunnel: public TunnelBase
{
public:
TransitTunnel (uint32_t receiveTunnelID,
const i2p::data::IdentHash& nextIdent, uint32_t nextTunnelID,
const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey);
virtual size_t GetNumTransmittedBytes () const { return 0; };
// implements TunnelBase
void SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg) override;
void HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg) override;
void EncryptTunnelMsg (std::shared_ptr<const I2NPMessage> in, std::shared_ptr<I2NPMessage> out) override;
private:
i2p::crypto::AESKey m_LayerKey, m_IVKey;
std::unique_ptr<i2p::crypto::TunnelEncryption> m_Encryption;
};
class TransitTunnelParticipant: public TransitTunnel
{
public:
TransitTunnelParticipant (uint32_t receiveTunnelID,
const i2p::data::IdentHash& nextIdent, uint32_t nextTunnelID,
const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey):
TransitTunnel (receiveTunnelID, nextIdent, nextTunnelID,
layerKey, ivKey), m_NumTransmittedBytes (0) {};
~TransitTunnelParticipant ();
size_t GetNumTransmittedBytes () const override { return m_NumTransmittedBytes; };
void HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg) override;
void FlushTunnelDataMsgs () override;
private:
size_t m_NumTransmittedBytes;
std::list<std::shared_ptr<i2p::I2NPMessage> > m_TunnelDataMsgs;
};
class TransitTunnelGateway: public TransitTunnel
{
public:
TransitTunnelGateway (uint32_t receiveTunnelID,
const i2p::data::IdentHash& nextIdent, uint32_t nextTunnelID,
const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey):
TransitTunnel (receiveTunnelID, nextIdent, nextTunnelID,
layerKey, ivKey), m_Gateway(this) {};
void SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg) override;
void FlushTunnelDataMsgs () override;
size_t GetNumTransmittedBytes () const override { return m_Gateway.GetNumSentBytes (); };
private:
std::mutex m_SendMutex;
TunnelGateway m_Gateway;
};
class TransitTunnelEndpoint: public TransitTunnel
{
public:
TransitTunnelEndpoint (uint32_t receiveTunnelID,
const i2p::data::IdentHash& nextIdent, uint32_t nextTunnelID,
const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey):
TransitTunnel (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey),
m_Endpoint (false) {}; // transit endpoint is always outbound
void Cleanup () override { m_Endpoint.Cleanup (); }
void HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg) override;
size_t GetNumTransmittedBytes () const override { return m_Endpoint.GetNumReceivedBytes (); }
private:
TunnelEndpoint m_Endpoint;
};
std::shared_ptr<TransitTunnel> CreateTransitTunnel (uint32_t receiveTunnelID,
const i2p::data::IdentHash& nextIdent, uint32_t nextTunnelID,
const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey,
bool isGateway, bool isEndpoint);
void HandleShortTransitTunnelBuildMsg (std::shared_ptr<I2NPMessage> msg);
void HandleVariableTransitTunnelBuildMsg (std::shared_ptr<I2NPMessage> msg);
}
}
#endif