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I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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105 lines
2.8 KiB
105 lines
2.8 KiB
/* |
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* Copyright (c) 2013-2024, 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_BASE_H__ |
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#define TUNNEL_BASE_H__ |
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#include <inttypes.h> |
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#include <memory> |
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#include <future> |
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#include <list> |
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#include "Timestamp.h" |
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#include "I2NPProtocol.h" |
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#include "Identity.h" |
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namespace i2p |
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{ |
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namespace transport |
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{ |
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class TransportSession; |
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} |
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namespace tunnel |
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{ |
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const size_t TUNNEL_DATA_MSG_SIZE = 1028; |
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const size_t TUNNEL_DATA_ENCRYPTED_SIZE = 1008; |
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const size_t TUNNEL_DATA_MAX_PAYLOAD_SIZE = 1003; |
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enum TunnelDeliveryType |
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{ |
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eDeliveryTypeLocal = 0, |
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eDeliveryTypeTunnel = 1, |
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eDeliveryTypeRouter = 2 |
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}; |
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struct TunnelMessageBlock |
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{ |
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TunnelDeliveryType deliveryType; |
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i2p::data::IdentHash hash; |
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uint32_t tunnelID; |
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std::shared_ptr<I2NPMessage> data; |
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}; |
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class TunnelBase |
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{ |
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public: |
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TunnelBase (uint32_t tunnelID, uint32_t nextTunnelID, const i2p::data::IdentHash& nextIdent): |
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m_TunnelID (tunnelID), m_NextTunnelID (nextTunnelID), m_NextIdent (nextIdent), |
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m_CreationTime (i2p::util::GetSecondsSinceEpoch ()) {}; |
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virtual ~TunnelBase () {}; |
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virtual void Cleanup () {}; |
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virtual void HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg) = 0; |
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virtual void SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg) = 0; |
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virtual void FlushTunnelDataMsgs () {}; |
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virtual void EncryptTunnelMsg (std::shared_ptr<const I2NPMessage> in, std::shared_ptr<I2NPMessage> out) = 0; |
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uint32_t GetNextTunnelID () const { return m_NextTunnelID; }; |
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const i2p::data::IdentHash& GetNextIdentHash () const { return m_NextIdent; }; |
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virtual uint32_t GetTunnelID () const { return m_TunnelID; }; // as known at our side |
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uint32_t GetCreationTime () const { return m_CreationTime; }; |
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void SetCreationTime (uint32_t t) { m_CreationTime = t; }; |
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private: |
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uint32_t m_TunnelID, m_NextTunnelID; |
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i2p::data::IdentHash m_NextIdent; |
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uint32_t m_CreationTime; // seconds since epoch |
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}; |
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struct TunnelCreationTimeCmp |
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{ |
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template<typename T> |
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bool operator() (const std::shared_ptr<T> & t1, const std::shared_ptr<T> & t2) const |
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{ |
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if (t1->GetCreationTime () != t2->GetCreationTime ()) |
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return t1->GetCreationTime () > t2->GetCreationTime (); |
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else |
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return t1 < t2; |
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} |
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}; |
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class TunnelTransportSender final |
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{ |
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public: |
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TunnelTransportSender () = default; |
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~TunnelTransportSender () = default; |
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void SendMessagesTo (const i2p::data::IdentHash& to, std::list<std::shared_ptr<I2NPMessage> >&& msgs); |
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void SendMessagesTo (const i2p::data::IdentHash& to, std::list<std::shared_ptr<I2NPMessage> >& msgs); // send and clear |
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private: |
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std::weak_ptr<i2p::transport::TransportSession> m_CurrentTransport; |
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std::future<std::shared_ptr<i2p::transport::TransportSession> > m_PendingTransport; |
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}; |
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} |
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} |
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#endif
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