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 TUNNEL_BASE_H__
#define TUNNEL_BASE_H__
#include <inttypes.h>
#include <memory>
#include <future>
#include <list>
#include "Timestamp.h"
#include "I2NPProtocol.h"
#include "Identity.h"
namespace i2p
{
namespace transport
{
class TransportSession;
}
namespace tunnel
{
const size_t TUNNEL_DATA_MSG_SIZE = 1028;
const size_t TUNNEL_DATA_ENCRYPTED_SIZE = 1008;
const size_t TUNNEL_DATA_MAX_PAYLOAD_SIZE = 1003;
enum TunnelDeliveryType
{
eDeliveryTypeLocal = 0,
eDeliveryTypeTunnel = 1,
eDeliveryTypeRouter = 2
};
struct TunnelMessageBlock
{
TunnelDeliveryType deliveryType;
i2p::data::IdentHash hash;
uint32_t tunnelID;
std::shared_ptr<I2NPMessage> data;
};
class TunnelBase
{
public:
TunnelBase (uint32_t tunnelID, uint32_t nextTunnelID, const i2p::data::IdentHash& nextIdent):
m_TunnelID (tunnelID), m_NextTunnelID (nextTunnelID), m_NextIdent (nextIdent),
m_CreationTime (i2p::util::GetSecondsSinceEpoch ()) {};
virtual ~TunnelBase () {};
virtual void Cleanup () {};
virtual void HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg) = 0;
virtual void SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg) = 0;
virtual void FlushTunnelDataMsgs () {};
virtual void EncryptTunnelMsg (std::shared_ptr<const I2NPMessage> in, std::shared_ptr<I2NPMessage> out) = 0;
uint32_t GetNextTunnelID () const { return m_NextTunnelID; };
const i2p::data::IdentHash& GetNextIdentHash () const { return m_NextIdent; };
virtual uint32_t GetTunnelID () const { return m_TunnelID; }; // as known at our side
uint32_t GetCreationTime () const { return m_CreationTime; };
void SetCreationTime (uint32_t t) { m_CreationTime = t; };
private:
uint32_t m_TunnelID, m_NextTunnelID;
i2p::data::IdentHash m_NextIdent;
uint32_t m_CreationTime; // seconds since epoch
};
struct TunnelCreationTimeCmp
{
template<typename T>
bool operator() (const std::shared_ptr<T> & t1, const std::shared_ptr<T> & t2) const
{
if (t1->GetCreationTime () != t2->GetCreationTime ())
return t1->GetCreationTime () > t2->GetCreationTime ();
else
return t1 < t2;
}
};
class TunnelTransportSender final
{
public:
TunnelTransportSender () = default;
~TunnelTransportSender () = default;
void SendMessagesTo (const i2p::data::IdentHash& to, std::list<std::shared_ptr<I2NPMessage> >&& msgs);
void SendMessagesTo (const i2p::data::IdentHash& to, std::list<std::shared_ptr<I2NPMessage> >& msgs); // send and clear
private:
std::weak_ptr<i2p::transport::TransportSession> m_CurrentTransport;
std::future<std::shared_ptr<i2p::transport::TransportSession> > m_PendingTransport;
};
}
}
#endif