I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef TUNNEL_H__
#define TUNNEL_H__
#include <inttypes.h>
#include <map>
#include <list>
#include <string>
#include <thread>
#include <cryptopp/modes.h>
#include <cryptopp/aes.h>
#include "Queue.h"
#include "TunnelConfig.h"
#include "TransitTunnel.h"
#include "TunnelEndpoint.h"
#include "TunnelGateway.h"
#include "TunnelBase.h"
#include "I2NPProtocol.h"
namespace i2p
{
namespace tunnel
{
const int TUNNEL_EXPIRATION_TIMEOUT = 600; // 10 minutes
class OutboundTunnel;
class InboundTunnel;
class Tunnel: public TunnelBase
{
public:
Tunnel (TunnelConfig * config);
~Tunnel ();
void Build (uint32_t replyMsgID, OutboundTunnel * outboundTunnel = 0);
virtual uint32_t GetTunnelID () const = 0; // as known at our side
TunnelConfig * GetTunnelConfig () const { return m_Config; }
uint32_t GetCreationTime () const { return m_CreationTime; };
bool IsEstablished () const { return m_IsEstablished; };
bool HandleTunnelBuildResponse (uint8_t * msg, size_t len);
// implements TunnelBase
void EncryptTunnelMsg (I2NPMessage * tunnelMsg);
uint32_t GetNextTunnelID () const { return m_Config->GetFirstHop ()->tunnelID; };
const i2p::data::IdentHash& GetNextIdentHash () const { return m_Config->GetFirstHop ()->router->GetIdentHash (); };
private:
void LayerDecrypt (const uint8_t * in, size_t len, const uint8_t * layerKey,
const uint8_t * iv, uint8_t * out);
void IVDecrypt (const uint8_t * in, const uint8_t * ivKey, uint8_t * out);
private:
TunnelConfig * m_Config;
uint32_t m_CreationTime; // seconds since epoch
bool m_IsEstablished;
CryptoPP::ECB_Mode<CryptoPP::AES>::Decryption m_ECBDecryption;
CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption m_CBCDecryption;
};
class OutboundTunnel: public Tunnel
{
public:
OutboundTunnel (TunnelConfig * config): Tunnel (config), m_Gateway (this) {};
void SendTunnelDataMsg (i2p::I2NPMessage * msg); //local
void SendTunnelDataMsg (const uint8_t * gwHash, uint32_t gwTunnel, i2p::I2NPMessage * msg);
uint32_t GetTunnelID () const { return GetNextTunnelID (); };
TunnelGateway& GetTunnelGateway () { return m_Gateway; };
size_t GetNumSentBytes () const { return m_Gateway.GetNumSentBytes (); };
private:
TunnelGateway m_Gateway;
};
class InboundTunnel: public Tunnel
{
public:
InboundTunnel (TunnelConfig * config): Tunnel (config) {};
void HandleTunnelDataMsg (I2NPMessage * msg);
uint32_t GetTunnelID () const { return GetTunnelConfig ()->GetLastHop ()->nextTunnelID; };
size_t GetNumReceivedBytes () const { return m_Endpoint.GetNumReceivedBytes (); };
private:
TunnelEndpoint m_Endpoint;
};
class Tunnels
{
public:
Tunnels ();
~Tunnels ();
void Start ();
void Stop ();
InboundTunnel * GetInboundTunnel (uint32_t tunnelID);
Tunnel * GetPendingTunnel (uint32_t replyMsgID);
InboundTunnel * GetNextInboundTunnel ();
OutboundTunnel * GetNextOutboundTunnel ();
TransitTunnel * GetTransitTunnel (uint32_t tunnelID);
void AddTransitTunnel (TransitTunnel * tunnel);
void AddOutboundTunnel (OutboundTunnel * newTunnel);
void AddInboundTunnel (InboundTunnel * newTunnel);
void PostTunnelData (I2NPMessage * msg);
template<class TTunnel>
TTunnel * CreateTunnel (TunnelConfig * config, OutboundTunnel * outboundTunnel = 0);
OutboundTunnel * CreateOneHopOutboundTestTunnel (InboundTunnel * replyTunnel);
InboundTunnel * CreateOneHopInboundTestTunnel (OutboundTunnel * outboundTunnel = 0);
OutboundTunnel * CreateTwoHopsOutboundTestTunnel (InboundTunnel * replyTunnel);
InboundTunnel * CreateTwoHopsInboundTestTunnel (OutboundTunnel * outboundTunnel = 0);
private:
void Run ();
void ManageTunnels ();
void ManageOutboundTunnels ();
void ManageInboundTunnels ();
void CreateZeroHopsInboundTunnel ();
private:
bool m_IsRunning;
bool m_IsTunnelCreated; // TODO: temporary
uint32_t m_NextReplyMsgID; // TODO: make it random later
std::thread * m_Thread;
std::map<uint32_t, Tunnel *> m_PendingTunnels; // by replyMsgID
std::map<uint32_t, InboundTunnel *> m_InboundTunnels;
std::list<OutboundTunnel *> m_OutboundTunnels;
std::map<uint32_t, TransitTunnel *> m_TransitTunnels;
i2p::util::Queue<I2NPMessage> m_Queue;
public:
// for HTTP only
const decltype(m_OutboundTunnels)& GetOutboundTunnels () const { return m_OutboundTunnels; };
const decltype(m_InboundTunnels)& GetInboundTunnels () const { return m_InboundTunnels; };
const decltype(m_TransitTunnels)& GetTransitTunnels () const { return m_TransitTunnels; };
};
extern Tunnels tunnels;
}
}
#endif