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 <vector>
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#include <string>
#include <thread>
#include <mutex>
#include <memory>
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#include "Queue.h"
#include "TunnelConfig.h"
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#include "TunnelPool.h"
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#include "TransitTunnel.h"
#include "TunnelEndpoint.h"
#include "TunnelGateway.h"
#include "TunnelBase.h"
#include "I2NPProtocol.h"
namespace i2p
{
namespace tunnel
{
const int TUNNEL_EXPIRATION_TIMEOUT = 660; // 11 minutes
const int TUNNEL_EXPIRATION_THRESHOLD = 60; // 1 minute
const int TUNNEL_CREATION_TIMEOUT = 30; // 30 seconds
const int STANDARD_NUM_RECORDS = 5; // in VariableTunnelBuild message
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enum TunnelState
{
eTunnelStatePending,
eTunnelStateBuildReplyReceived,
eTunnelStateBuildFailed,
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eTunnelStateEstablished,
eTunnelStateTestFailed,
eTunnelStateFailed,
eTunnelStateExpiring
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};
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class OutboundTunnel;
class InboundTunnel;
class Tunnel: public TunnelBase
{
public:
Tunnel (TunnelConfig * config);
~Tunnel ();
void Build (uint32_t replyMsgID, std::shared_ptr<OutboundTunnel> outboundTunnel = nullptr);
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TunnelConfig * GetTunnelConfig () const { return m_Config; }
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TunnelState GetState () const { return m_State; };
void SetState (TunnelState state) { m_State = state; };
bool IsEstablished () const { return m_State == eTunnelStateEstablished; };
bool IsFailed () const { return m_State == eTunnelStateFailed; };
std::shared_ptr<TunnelPool> GetTunnelPool () const { return m_Pool; };
void SetTunnelPool (std::shared_ptr<TunnelPool> pool) { m_Pool = pool; };
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bool HandleTunnelBuildResponse (uint8_t * msg, size_t len);
// implements TunnelBase
void SendTunnelDataMsg (i2p::I2NPMessage * msg);
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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:
TunnelConfig * m_Config;
std::shared_ptr<TunnelPool> m_Pool; // pool, tunnel belongs to, or null
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TunnelState m_State;
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};
class OutboundTunnel: public Tunnel
{
public:
OutboundTunnel (TunnelConfig * config): Tunnel (config), m_Gateway (this) {};
void SendTunnelDataMsg (const uint8_t * gwHash, uint32_t gwTunnel, i2p::I2NPMessage * msg);
void SendTunnelDataMsg (const std::vector<TunnelMessageBlock>& msgs); // multiple messages
std::shared_ptr<const i2p::data::RouterInfo> GetEndpointRouter () const
{ return GetTunnelConfig ()->GetLastHop ()->router; };
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size_t GetNumSentBytes () const { return m_Gateway.GetNumSentBytes (); };
// implements TunnelBase
void HandleTunnelDataMsg (i2p::I2NPMessage * tunnelMsg);
uint32_t GetTunnelID () const { return GetNextTunnelID (); };
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private:
std::mutex m_SendMutex;
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TunnelGateway m_Gateway;
};
class InboundTunnel: public Tunnel, public std::enable_shared_from_this<InboundTunnel>
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{
public:
InboundTunnel (TunnelConfig * config): Tunnel (config), m_Endpoint (true) {};
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void HandleTunnelDataMsg (I2NPMessage * msg);
size_t GetNumReceivedBytes () const { return m_Endpoint.GetNumReceivedBytes (); };
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// implements TunnelBase
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uint32_t GetTunnelID () const { return GetTunnelConfig ()->GetLastHop ()->nextTunnelID; };
private:
TunnelEndpoint m_Endpoint;
};
class Tunnels
{
public:
Tunnels ();
~Tunnels ();
void Start ();
void Stop ();
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std::shared_ptr<InboundTunnel> GetInboundTunnel (uint32_t tunnelID);
std::shared_ptr<InboundTunnel> GetPendingInboundTunnel (uint32_t replyMsgID);
std::shared_ptr<OutboundTunnel> GetPendingOutboundTunnel (uint32_t replyMsgID);
std::shared_ptr<InboundTunnel> GetNextInboundTunnel ();
std::shared_ptr<OutboundTunnel> GetNextOutboundTunnel ();
std::shared_ptr<TunnelPool> GetExploratoryPool () const { return m_ExploratoryPool; };
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TransitTunnel * GetTransitTunnel (uint32_t tunnelID);
int GetTransitTunnelsExpirationTimeout ();
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void AddTransitTunnel (TransitTunnel * tunnel);
void AddOutboundTunnel (std::shared_ptr<OutboundTunnel> newTunnel);
void AddInboundTunnel (std::shared_ptr<InboundTunnel> newTunnel);
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void PostTunnelData (I2NPMessage * msg);
void PostTunnelData (const std::vector<I2NPMessage *>& msgs);
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template<class TTunnel>
std::shared_ptr<TTunnel> CreateTunnel (TunnelConfig * config, std::shared_ptr<OutboundTunnel> outboundTunnel = nullptr);
void AddPendingTunnel (uint32_t replyMsgID, std::shared_ptr<InboundTunnel> tunnel);
void AddPendingTunnel (uint32_t replyMsgID, std::shared_ptr<OutboundTunnel> tunnel);
std::shared_ptr<TunnelPool> CreateTunnelPool (i2p::garlic::GarlicDestination * localDestination, int numInboundHops, int numOuboundHops);
void DeleteTunnelPool (std::shared_ptr<TunnelPool> pool);
void StopTunnelPool (std::shared_ptr<TunnelPool> pool);
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private:
template<class TTunnel>
std::shared_ptr<TTunnel> GetPendingTunnel (uint32_t replyMsgID, const std::map<uint32_t, std::shared_ptr<TTunnel> >& pendingTunnels);
void HandleTunnelGatewayMsg (TunnelBase * tunnel, I2NPMessage * msg);
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void Run ();
void ManageTunnels ();
void ManageOutboundTunnels ();
void ManageInboundTunnels ();
void ManageTransitTunnels ();
void ManagePendingTunnels ();
template<class PendingTunnels>
void ManagePendingTunnels (PendingTunnels& pendingTunnels);
void ManageTunnelPools ();
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void CreateZeroHopsInboundTunnel ();
private:
bool m_IsRunning;
std::thread * m_Thread;
std::map<uint32_t, std::shared_ptr<InboundTunnel> > m_PendingInboundTunnels; // by replyMsgID
std::map<uint32_t, std::shared_ptr<OutboundTunnel> > m_PendingOutboundTunnels; // by replyMsgID
std::map<uint32_t, std::shared_ptr<InboundTunnel> > m_InboundTunnels;
std::list<std::shared_ptr<OutboundTunnel> > m_OutboundTunnels;
std::mutex m_TransitTunnelsMutex;
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std::map<uint32_t, TransitTunnel *> m_TransitTunnels;
std::mutex m_PoolsMutex;
std::list<std::shared_ptr<TunnelPool>> m_Pools;
std::shared_ptr<TunnelPool> m_ExploratoryPool;
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i2p::util::Queue<I2NPMessage> m_Queue;
// some stats
int m_NumSuccesiveTunnelCreations, m_NumFailedTunnelCreations;
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public:
// for HTTP only
const decltype(m_OutboundTunnels)& GetOutboundTunnels () const { return m_OutboundTunnels; };
const decltype(m_InboundTunnels)& GetInboundTunnels () const { return m_InboundTunnels; };
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const decltype(m_TransitTunnels)& GetTransitTunnels () const { return m_TransitTunnels; };
int GetQueueSize () { return m_Queue.GetSize (); };
int GetTunnelCreationSuccessRate () const // in percents
{
int totalNum = m_NumSuccesiveTunnelCreations + m_NumFailedTunnelCreations;
return totalNum ? m_NumSuccesiveTunnelCreations*100/totalNum : 0;
}
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};
extern Tunnels tunnels;
}
}
#endif