mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
296 lines
11 KiB
296 lines
11 KiB
/* |
|
* Copyright (c) 2013-2022, 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_H__ |
|
#define TUNNEL_H__ |
|
|
|
#include <inttypes.h> |
|
#include <map> |
|
#include <unordered_map> |
|
#include <list> |
|
#include <vector> |
|
#include <string> |
|
#include <thread> |
|
#include <mutex> |
|
#include <memory> |
|
#include "util.h" |
|
#include "Queue.h" |
|
#include "Crypto.h" |
|
#include "TunnelConfig.h" |
|
#include "TunnelPool.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 = 660; // 11 minutes |
|
const int TUNNEL_EXPIRATION_THRESHOLD = 60; // 1 minute |
|
const int TUNNEL_RECREATION_THRESHOLD = 90; // 1.5 minutes |
|
const int TUNNEL_CREATION_TIMEOUT = 30; // 30 seconds |
|
const int STANDARD_NUM_RECORDS = 4; // in VariableTunnelBuild message |
|
const int MAX_NUM_RECORDS = 8; |
|
const int HIGH_LATENCY_PER_HOP = 250; // in milliseconds |
|
|
|
const size_t I2NP_TUNNEL_MESSAGE_SIZE = TUNNEL_DATA_MSG_SIZE + I2NP_HEADER_SIZE + 34; // reserved for alignment and NTCP 16 + 6 + 12 |
|
const size_t I2NP_TUNNEL_ENPOINT_MESSAGE_SIZE = 2*TUNNEL_DATA_MSG_SIZE + I2NP_HEADER_SIZE + TUNNEL_GATEWAY_HEADER_SIZE + 28; // reserved for alignment and NTCP 16 + 6 + 6 |
|
|
|
enum TunnelState |
|
{ |
|
eTunnelStatePending, |
|
eTunnelStateBuildReplyReceived, |
|
eTunnelStateBuildFailed, |
|
eTunnelStateEstablished, |
|
eTunnelStateTestFailed, |
|
eTunnelStateFailed, |
|
eTunnelStateExpiring |
|
}; |
|
|
|
class OutboundTunnel; |
|
class InboundTunnel; |
|
class Tunnel: public TunnelBase |
|
{ |
|
struct TunnelHop |
|
{ |
|
std::shared_ptr<const i2p::data::IdentityEx> ident; |
|
i2p::crypto::TunnelDecryption decryption; |
|
}; |
|
|
|
public: |
|
|
|
Tunnel (std::shared_ptr<const TunnelConfig> config); |
|
~Tunnel (); |
|
|
|
void Build (uint32_t replyMsgID, std::shared_ptr<OutboundTunnel> outboundTunnel = nullptr); |
|
|
|
std::shared_ptr<const TunnelConfig> GetTunnelConfig () const { return m_Config; } |
|
std::vector<std::shared_ptr<const i2p::data::IdentityEx> > GetPeers () const; |
|
std::vector<std::shared_ptr<const i2p::data::IdentityEx> > GetInvertedPeers () const; |
|
bool IsShortBuildMessage () const { return m_IsShortBuildMessage; }; |
|
i2p::data::RouterInfo::CompatibleTransports GetFarEndTransports () const { return m_FarEndTransports; }; |
|
TunnelState GetState () const { return m_State; }; |
|
void SetState (TunnelState state); |
|
bool IsEstablished () const { return m_State == eTunnelStateEstablished; }; |
|
bool IsFailed () const { return m_State == eTunnelStateFailed; }; |
|
bool IsRecreated () const { return m_IsRecreated; }; |
|
void SetRecreated (bool recreated) { m_IsRecreated = recreated; }; |
|
int GetNumHops () const { return m_Hops.size (); }; |
|
virtual bool IsInbound() const = 0; |
|
|
|
std::shared_ptr<TunnelPool> GetTunnelPool () const { return m_Pool; }; |
|
void SetTunnelPool (std::shared_ptr<TunnelPool> pool) { m_Pool = pool; }; |
|
|
|
bool HandleTunnelBuildResponse (uint8_t * msg, size_t len); |
|
|
|
virtual void Print (std::stringstream&) const {}; |
|
|
|
// implements TunnelBase |
|
void SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg); |
|
void EncryptTunnelMsg (std::shared_ptr<const I2NPMessage> in, std::shared_ptr<I2NPMessage> out); |
|
|
|
/** @brief add latency sample */ |
|
void AddLatencySample(const uint64_t ms) { m_Latency = (m_Latency + ms) >> 1; } |
|
/** @brief get this tunnel's estimated latency */ |
|
uint64_t GetMeanLatency() const { return m_Latency; } |
|
/** @brief return true if this tunnel's latency fits in range [lowerbound, upperbound] */ |
|
bool LatencyFitsRange(uint64_t lowerbound, uint64_t upperbound) const; |
|
|
|
bool LatencyIsKnown() const { return m_Latency > 0; } |
|
bool IsSlow () const { return LatencyIsKnown() && (int)m_Latency > HIGH_LATENCY_PER_HOP*GetNumHops (); } |
|
|
|
protected: |
|
|
|
void PrintHops (std::stringstream& s) const; |
|
|
|
private: |
|
|
|
std::shared_ptr<const TunnelConfig> m_Config; |
|
std::vector<TunnelHop> m_Hops; |
|
bool m_IsShortBuildMessage; |
|
std::shared_ptr<TunnelPool> m_Pool; // pool, tunnel belongs to, or null |
|
TunnelState m_State; |
|
i2p::data::RouterInfo::CompatibleTransports m_FarEndTransports; |
|
bool m_IsRecreated; // if tunnel is replaced by new, or new tunnel requested to replace |
|
uint64_t m_Latency; // in milliseconds |
|
}; |
|
|
|
class OutboundTunnel: public Tunnel |
|
{ |
|
public: |
|
|
|
OutboundTunnel (std::shared_ptr<const TunnelConfig> config): |
|
Tunnel (config), m_Gateway (this), m_EndpointIdentHash (config->GetLastIdentHash ()) {}; |
|
|
|
void SendTunnelDataMsg (const uint8_t * gwHash, uint32_t gwTunnel, std::shared_ptr<i2p::I2NPMessage> msg); |
|
virtual void SendTunnelDataMsg (const std::vector<TunnelMessageBlock>& msgs); // multiple messages |
|
const i2p::data::IdentHash& GetEndpointIdentHash () const { return m_EndpointIdentHash; }; |
|
virtual size_t GetNumSentBytes () const { return m_Gateway.GetNumSentBytes (); }; |
|
void Print (std::stringstream& s) const; |
|
|
|
// implements TunnelBase |
|
void HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg); |
|
|
|
bool IsInbound() const { return false; } |
|
|
|
private: |
|
|
|
std::mutex m_SendMutex; |
|
TunnelGateway m_Gateway; |
|
i2p::data::IdentHash m_EndpointIdentHash; |
|
}; |
|
|
|
class InboundTunnel: public Tunnel, public std::enable_shared_from_this<InboundTunnel> |
|
{ |
|
public: |
|
|
|
InboundTunnel (std::shared_ptr<const TunnelConfig> config): Tunnel (config), m_Endpoint (true) {}; |
|
void HandleTunnelDataMsg (std::shared_ptr<I2NPMessage>&& msg); |
|
virtual size_t GetNumReceivedBytes () const { return m_Endpoint.GetNumReceivedBytes (); }; |
|
void Print (std::stringstream& s) const; |
|
bool IsInbound() const { return true; } |
|
|
|
// override TunnelBase |
|
void Cleanup () { m_Endpoint.Cleanup (); }; |
|
|
|
private: |
|
|
|
TunnelEndpoint m_Endpoint; |
|
}; |
|
|
|
class ZeroHopsInboundTunnel: public InboundTunnel |
|
{ |
|
public: |
|
|
|
ZeroHopsInboundTunnel (); |
|
void SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg); |
|
void Print (std::stringstream& s) const; |
|
size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; }; |
|
|
|
private: |
|
|
|
size_t m_NumReceivedBytes; |
|
}; |
|
|
|
class ZeroHopsOutboundTunnel: public OutboundTunnel |
|
{ |
|
public: |
|
|
|
ZeroHopsOutboundTunnel (); |
|
void SendTunnelDataMsg (const std::vector<TunnelMessageBlock>& msgs); |
|
void Print (std::stringstream& s) const; |
|
size_t GetNumSentBytes () const { return m_NumSentBytes; }; |
|
|
|
private: |
|
|
|
size_t m_NumSentBytes; |
|
}; |
|
|
|
class Tunnels |
|
{ |
|
public: |
|
|
|
Tunnels (); |
|
~Tunnels (); |
|
void Start (); |
|
void Stop (); |
|
|
|
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; }; |
|
std::shared_ptr<TunnelBase> GetTunnel (uint32_t tunnelID); |
|
int GetTransitTunnelsExpirationTimeout (); |
|
void AddTransitTunnel (std::shared_ptr<TransitTunnel> tunnel); |
|
void AddOutboundTunnel (std::shared_ptr<OutboundTunnel> newTunnel); |
|
void AddInboundTunnel (std::shared_ptr<InboundTunnel> newTunnel); |
|
std::shared_ptr<InboundTunnel> CreateInboundTunnel (std::shared_ptr<TunnelConfig> config, std::shared_ptr<TunnelPool> pool, std::shared_ptr<OutboundTunnel> outboundTunnel); |
|
std::shared_ptr<OutboundTunnel> CreateOutboundTunnel (std::shared_ptr<TunnelConfig> config, std::shared_ptr<TunnelPool> pool); |
|
void PostTunnelData (std::shared_ptr<I2NPMessage> msg); |
|
void PostTunnelData (const std::vector<std::shared_ptr<I2NPMessage> >& msgs); |
|
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 (int numInboundHops, int numOuboundHops, |
|
int numInboundTunnels, int numOutboundTunnels, int inboundVariance, int outboundVariance); |
|
void DeleteTunnelPool (std::shared_ptr<TunnelPool> pool); |
|
void StopTunnelPool (std::shared_ptr<TunnelPool> pool); |
|
|
|
std::shared_ptr<I2NPMessage> NewI2NPTunnelMessage (bool endpoint); |
|
|
|
private: |
|
|
|
template<class TTunnel> |
|
std::shared_ptr<TTunnel> CreateTunnel (std::shared_ptr<TunnelConfig> config, |
|
std::shared_ptr<TunnelPool> pool, std::shared_ptr<OutboundTunnel> outboundTunnel = nullptr); |
|
|
|
template<class TTunnel> |
|
std::shared_ptr<TTunnel> GetPendingTunnel (uint32_t replyMsgID, const std::map<uint32_t, std::shared_ptr<TTunnel> >& pendingTunnels); |
|
|
|
void HandleTunnelGatewayMsg (std::shared_ptr<TunnelBase> tunnel, std::shared_ptr<I2NPMessage> msg); |
|
|
|
void Run (); |
|
void ManageTunnels (); |
|
void ManageOutboundTunnels (); |
|
void ManageInboundTunnels (); |
|
void ManageTransitTunnels (); |
|
void ManagePendingTunnels (); |
|
template<class PendingTunnels> |
|
void ManagePendingTunnels (PendingTunnels& pendingTunnels); |
|
void ManageTunnelPools (uint64_t ts); |
|
|
|
std::shared_ptr<ZeroHopsInboundTunnel> CreateZeroHopsInboundTunnel (std::shared_ptr<TunnelPool> pool); |
|
std::shared_ptr<ZeroHopsOutboundTunnel> CreateZeroHopsOutboundTunnel (std::shared_ptr<TunnelPool> pool); |
|
|
|
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::list<std::shared_ptr<InboundTunnel> > m_InboundTunnels; |
|
std::list<std::shared_ptr<OutboundTunnel> > m_OutboundTunnels; |
|
std::list<std::shared_ptr<TransitTunnel> > m_TransitTunnels; |
|
std::unordered_map<uint32_t, std::shared_ptr<TunnelBase> > m_Tunnels; // tunnelID->tunnel known by this id |
|
std::mutex m_PoolsMutex; |
|
std::list<std::shared_ptr<TunnelPool>> m_Pools; |
|
std::shared_ptr<TunnelPool> m_ExploratoryPool; |
|
i2p::util::Queue<std::shared_ptr<I2NPMessage> > m_Queue; |
|
i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_TUNNEL_ENPOINT_MESSAGE_SIZE> > m_I2NPTunnelEndpointMessagesMemoryPool; |
|
i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_TUNNEL_MESSAGE_SIZE> > m_I2NPTunnelMessagesMemoryPool; |
|
|
|
// some stats |
|
int m_NumSuccesiveTunnelCreations, m_NumFailedTunnelCreations; |
|
|
|
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; }; |
|
|
|
size_t CountTransitTunnels() const; |
|
size_t CountInboundTunnels() const; |
|
size_t CountOutboundTunnels() const; |
|
|
|
int GetQueueSize () { return m_Queue.GetSize (); }; |
|
int GetTunnelCreationSuccessRate () const // in percents |
|
{ |
|
int totalNum = m_NumSuccesiveTunnelCreations + m_NumFailedTunnelCreations; |
|
return totalNum ? m_NumSuccesiveTunnelCreations*100/totalNum : 0; |
|
} |
|
}; |
|
|
|
extern Tunnels tunnels; |
|
} |
|
} |
|
|
|
#endif
|
|
|