I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef TUNNEL_POOL__
#define TUNNEL_POOL__
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#include <inttypes.h>
#include <set>
#include <vector>
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#include <utility>
#include <mutex>
#include <memory>
#include "Identity.h"
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#include "LeaseSet.h"
#include "RouterInfo.h"
#include "I2NPProtocol.h"
#include "TunnelBase.h"
#include "RouterContext.h"
#include "Garlic.h"
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namespace i2p
{
namespace tunnel
{
class Tunnel;
class InboundTunnel;
class OutboundTunnel;
enum TunnelBuildResult {
eBuildResultOkay, // tunnel was built okay
eBuildResultRejected, // tunnel build was explicitly rejected
eBuildResultTimeout // tunnel build timed out
};
typedef std::shared_ptr<const i2p::data::IdentityEx> Peer;
typedef std::vector<Peer> Path;
/** interface for custom tunnel peer selection algorithm */
struct ITunnelPeerSelector
{
virtual ~ITunnelPeerSelector() {};
virtual bool SelectPeers(Path & peers, int hops, bool isInbound) = 0;
virtual bool OnBuildResult(const Path & peers, bool isInbound, TunnelBuildResult result) = 0;
};
typedef std::function<std::shared_ptr<const i2p::data::RouterInfo>(std::shared_ptr<const i2p::data::RouterInfo>)> SelectHopFunc;
// standard peer selection algorithm
bool StandardSelectPeers(Path & path, int hops, bool inbound, SelectHopFunc nextHop);
class TunnelPool: public std::enable_shared_from_this<TunnelPool> // per local destination
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{
public:
TunnelPool (int numInboundHops, int numOutboundHops, int numInboundTunnels, int numOutboundTunnels);
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~TunnelPool ();
std::shared_ptr<i2p::garlic::GarlicDestination> GetLocalDestination () const { return m_LocalDestination; };
void SetLocalDestination (std::shared_ptr<i2p::garlic::GarlicDestination> destination) { m_LocalDestination = destination; };
void SetExplicitPeers (std::shared_ptr<std::vector<i2p::data::IdentHash> > explicitPeers);
void CreateTunnels ();
void TunnelCreated (std::shared_ptr<InboundTunnel> createdTunnel);
void TunnelExpired (std::shared_ptr<InboundTunnel> expiredTunnel);
void TunnelCreated (std::shared_ptr<OutboundTunnel> createdTunnel);
void TunnelExpired (std::shared_ptr<OutboundTunnel> expiredTunnel);
void RecreateInboundTunnel (std::shared_ptr<InboundTunnel> tunnel);
void RecreateOutboundTunnel (std::shared_ptr<OutboundTunnel> tunnel);
std::vector<std::shared_ptr<InboundTunnel> > GetInboundTunnels (int num) const;
std::shared_ptr<OutboundTunnel> GetNextOutboundTunnel (std::shared_ptr<OutboundTunnel> excluded = nullptr) const;
std::shared_ptr<InboundTunnel> GetNextInboundTunnel (std::shared_ptr<InboundTunnel> excluded = nullptr) const;
std::shared_ptr<OutboundTunnel> GetNewOutboundTunnel (std::shared_ptr<OutboundTunnel> old) const;
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void TestTunnels ();
void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg);
void ProcessDeliveryStatus (std::shared_ptr<I2NPMessage> msg);
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bool IsActive () const { return m_IsActive; };
void SetActive (bool isActive) { m_IsActive = isActive; };
void DetachTunnels ();
int GetNumInboundTunnels () const { return m_NumInboundTunnels; };
int GetNumOutboundTunnels () const { return m_NumOutboundTunnels; };
void SetCustomPeerSelector(ITunnelPeerSelector * selector);
void UnsetCustomPeerSelector();
bool HasCustomPeerSelector();
/** @brief make this tunnel pool yield tunnels that fit latency range [min, max] */
void RequireLatency(uint64_t min, uint64_t max) { m_MinLatency = min; m_MaxLatency = max; }
/** @brief return true if this tunnel pool has a latency requirement */
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bool HasLatencyRequirement() const { return m_MinLatency > 0 && m_MaxLatency > 0; }
/** @brief get the lowest latency tunnel in this tunnel pool regardless of latency requirements */
std::shared_ptr<InboundTunnel> GetLowestLatencyInboundTunnel(std::shared_ptr<InboundTunnel> exclude=nullptr) const;
std::shared_ptr<OutboundTunnel> GetLowestLatencyOutboundTunnel(std::shared_ptr<OutboundTunnel> exclude=nullptr) const;
void OnTunnelBuildResult(std::shared_ptr<Tunnel> tunnel, TunnelBuildResult result);
// for overriding tunnel peer selection
std::shared_ptr<const i2p::data::RouterInfo> SelectNextHop (std::shared_ptr<const i2p::data::RouterInfo> prevHop) const;
private:
void CreateInboundTunnel ();
void CreateOutboundTunnel ();
void CreatePairedInboundTunnel (std::shared_ptr<OutboundTunnel> outboundTunnel);
template<class TTunnels>
typename TTunnels::value_type GetNextTunnel (TTunnels& tunnels, typename TTunnels::value_type excluded) const;
bool SelectPeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& hops, bool isInbound);
bool SelectExplicitPeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& hops, bool isInbound);
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private:
std::shared_ptr<i2p::garlic::GarlicDestination> m_LocalDestination;
int m_NumInboundHops, m_NumOutboundHops, m_NumInboundTunnels, m_NumOutboundTunnels;
std::shared_ptr<std::vector<i2p::data::IdentHash> > m_ExplicitPeers;
mutable std::mutex m_InboundTunnelsMutex;
std::set<std::shared_ptr<InboundTunnel>, TunnelCreationTimeCmp> m_InboundTunnels; // recent tunnel appears first
mutable std::mutex m_OutboundTunnelsMutex;
std::set<std::shared_ptr<OutboundTunnel>, TunnelCreationTimeCmp> m_OutboundTunnels;
mutable std::mutex m_TestsMutex;
std::map<uint32_t, std::pair<std::shared_ptr<OutboundTunnel>, std::shared_ptr<InboundTunnel> > > m_Tests;
bool m_IsActive;
std::mutex m_CustomPeerSelectorMutex;
ITunnelPeerSelector * m_CustomPeerSelector;
uint64_t m_MinLatency=0; // if > 0 this tunnel pool will try building tunnels with minimum latency by ms
uint64_t m_MaxLatency=0; // if > 0 this tunnel pool will try building tunnels with maximum latency by ms
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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}
}
#endif