add option for client tunnels to build tunnels such that OBEP==IBGW

ClientContext.cpp

@@ -10,6 +10,7 @@
 #include "ClientContext.h"
 #include "SOCKS.h"
 #include "WebSocks.h"
+#include "MatchedDestination.h"
 
 namespace i2p
 {
@@ -318,6 +319,16 @@ namespace client
 		return localDestination;
 	}
 
+	std::shared_ptr<ClientDestination> ClientContext::CreateNewMatchedTunnelDestination(const i2p::data::PrivateKeys &keys, const std::string & name, const std::map<std::string, std::string> * params)
+	{
+		MatchedTunnelDestination * cl = new MatchedTunnelDestination(keys, name, params);
+		auto localDestination = std::shared_ptr<ClientDestination>(cl);
+		std::unique_lock<std::mutex> l(m_DestinationsMutex);
+		m_Destinations[localDestination->GetIdentHash ()] = localDestination;
+		localDestination->Start ();
+		return localDestination;
+	}
+
 	void ClientContext::DeleteLocalDestination (std::shared_ptr<ClientDestination> destination)
 	{
 		if (!destination) return;
@@ -440,6 +451,7 @@ namespace client
 						dest = section.second.get<std::string> (I2P_CLIENT_TUNNEL_DESTINATION);
 					int port = section.second.get<int> (I2P_CLIENT_TUNNEL_PORT);
 					// optional params
+					bool matchTunnels = section.second.get(I2P_CLIENT_TUNNEL_MATCH_TUNNELS, false);
 					std::string keys = section.second.get (I2P_CLIENT_TUNNEL_KEYS, "");
 					std::string address = section.second.get (I2P_CLIENT_TUNNEL_ADDRESS, "127.0.0.1");
 					int destinationPort = section.second.get (I2P_CLIENT_TUNNEL_DESTINATION_PORT, 0);
@@ -456,9 +468,15 @@ namespace client
 						{
 							localDestination = FindLocalDestination (k.GetPublic ()->GetIdentHash ());
 							if (!localDestination)
+							{
+								if(matchTunnels)
+									localDestination = CreateNewMatchedTunnelDestination(k, dest, &options);
+								else
 									localDestination = CreateNewLocalDestination (k, type == I2P_TUNNELS_SECTION_TYPE_UDPCLIENT, &options);
 							}
 						}
+					}
+
 					if (type == I2P_TUNNELS_SECTION_TYPE_UDPCLIENT) {
 						// udp client
 						// TODO: hostnames

ClientContext.h

@@ -35,6 +35,7 @@ namespace client
 	const char I2P_CLIENT_TUNNEL_KEYS[] = "keys";
 	const char I2P_CLIENT_TUNNEL_SIGNATURE_TYPE[] = "signaturetype";
 	const char I2P_CLIENT_TUNNEL_DESTINATION_PORT[] = "destinationport";
+  const char I2P_CLIENT_TUNNEL_MATCH_TUNNELS[] = "matchtunnels";
 	const char I2P_SERVER_TUNNEL_HOST[] = "host";
 	const char I2P_SERVER_TUNNEL_HOST_OVERRIDE[] = "hostoverride";
 	const char I2P_SERVER_TUNNEL_PORT[] = "port";
@@ -47,6 +48,7 @@ namespace client
 	const char I2P_SERVER_TUNNEL_ADDRESS[] = "address";
 	const char I2P_SERVER_TUNNEL_ENABLE_UNIQUE_LOCAL[] = "enableuniquelocal";
 
+
 	class ClientContext
 	{
 		public:
@@ -64,6 +66,7 @@ namespace client
 			    const std::map<std::string, std::string> * params = nullptr); // transient
 			std::shared_ptr<ClientDestination> CreateNewLocalDestination (const i2p::data::PrivateKeys& keys, bool isPublic = true,
                                                                     const std::map<std::string, std::string> * params = nullptr);
+    std::shared_ptr<ClientDestination> CreateNewMatchedTunnelDestination(const i2p::data::PrivateKeys &keys, const std::string & name, const std::map<std::string, std::string> * params = nullptr);
 			void DeleteLocalDestination (std::shared_ptr<ClientDestination> destination);
 			std::shared_ptr<ClientDestination> FindLocalDestination (const i2p::data::IdentHash& destination) const;
 			bool LoadPrivateKeys (i2p::data::PrivateKeys& keys, const std::string& filename, i2p::data::SigningKeyType sigType = i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA256_P256);

Datagram.h

@@ -147,4 +147,3 @@ namespace datagram
 }
 
 #endif
-

Destination.h

@@ -175,8 +175,8 @@ namespace client
 			ClientDestination (const i2p::data::PrivateKeys& keys, bool isPublic, const std::map<std::string, std::string> * params = nullptr);
 			~ClientDestination ();
 
-			bool Start ();
-			bool Stop ();
+			virtual bool Start ();
+			virtual bool Stop ();
 
 			const i2p::data::PrivateKeys& GetPrivateKeys () const { return m_Keys; };
 			void Sign (const uint8_t * buf, int len, uint8_t * signature) const { m_Keys.Sign (buf, len, signature); };

MatchedDestination.cpp

@@ -0,0 +1,105 @@
+#include "MatchedDestination.h"
+#include "Log.h"
+#include "ClientContext.h"
+
+
+namespace i2p
+{
+namespace client
+{
+	MatchedTunnelDestination::MatchedTunnelDestination(const i2p::data::PrivateKeys & keys, const std::string & remoteName, const std::map<std::string, std::string> * params)
+		: ClientDestination(keys, false, params),
+			m_RemoteName(remoteName) {}
+
+	void MatchedTunnelDestination::ResolveCurrentLeaseSet()
+	{
+		if(i2p::client::context.GetAddressBook().GetIdentHash(m_RemoteName, m_RemoteIdent))
+		{
+			auto ls = FindLeaseSet(m_RemoteIdent);
+			if(ls)
+			{
+				HandleFoundCurrentLeaseSet(ls);
+			}
+			else
+				RequestDestination(m_RemoteIdent, std::bind(&MatchedTunnelDestination::HandleFoundCurrentLeaseSet, this, std::placeholders::_1));
+		}
+		else
+			LogPrint(eLogWarning, "Destination: failed to resolve ", m_RemoteName);
+	}
+
+	void MatchedTunnelDestination::HandleFoundCurrentLeaseSet(std::shared_ptr<const i2p::data::LeaseSet> ls)
+	{
+		if(ls)
+		{
+			LogPrint(eLogDebug, "Destination: resolved remote lease set for ", m_RemoteName);
+			m_RemoteLeaseSet = ls;
+		}
+		else
+			ResolveCurrentLeaseSet();
+	}
+
+
+	bool MatchedTunnelDestination::Start()
+	{
+		if(ClientDestination::Start())
+		{
+			GetTunnelPool()->SetCustomPeerSelector(this);
+			ResolveCurrentLeaseSet();
+			return true;
+		}
+		else
+			return false;
+	}
+
+	bool MatchedTunnelDestination::Stop()
+	{
+		if(ClientDestination::Stop())
+		{
+
+			return true;
+		}
+		else
+			return false;
+	}
+
+
+	bool MatchedTunnelDestination::SelectPeers(i2p::tunnel::Path & path, int hops, bool inbound)
+	{
+		auto pool = GetTunnelPool();
+		if(!i2p::tunnel::StandardSelectPeers(path, hops, inbound, std::bind(&i2p::tunnel::TunnelPool::SelectNextHop, pool, std::placeholders::_1)))
+			return false;
+		// more here for outbound tunnels
+		if(!inbound && m_RemoteLeaseSet)
+		{
+			if(m_RemoteLeaseSet->IsExpired())
+			{
+				ResolveCurrentLeaseSet();
+			}
+			if(m_RemoteLeaseSet && !m_RemoteLeaseSet->IsExpired())
+			{
+				// remote lease set is good
+				auto leases = m_RemoteLeaseSet->GetNonExpiredLeases();
+				// pick lease
+				std::shared_ptr<i2p::data::RouterInfo> obep;
+				while(!obep && leases.size() > 0) {
+					auto idx = rand() % leases.size();
+					auto lease = leases[idx];
+					obep = i2p::data::netdb.FindRouter(lease->tunnelGateway);
+					leases.erase(leases.begin()+idx);
+				}
+				if(obep) {
+					path.push_back(obep->GetRouterIdentity());
+					LogPrint(eLogDebug, "Destination: found OBEP matching IBGW");
+				} else
+					LogPrint(eLogWarning, "Destination: could not find proper IBGW for matched outbound tunnel");
+			}
+		}
+		return true;
+	}
+
+	bool MatchedTunnelDestination::OnBuildResult(const i2p::tunnel::Path & path, bool inbound, i2p::tunnel::TunnelBuildResult result)
+	{
+		return true;
+	}
+}
+}

MatchedDestination.h

@@ -0,0 +1,35 @@
+#ifndef MATCHED_DESTINATION_H_
+#define MATCHED_DESTINATION_H_
+#include "Destination.h"
+#include <string>
+
+namespace i2p
+{
+namespace client
+{
+  /**
+     client tunnel that uses same OBEP as IBGW of each remote lease for a remote destination
+   */
+  class MatchedTunnelDestination : public ClientDestination, public i2p::tunnel::ITunnelPeerSelector
+  {
+  public:
+    MatchedTunnelDestination(const i2p::data::PrivateKeys& keys, const std::string & remoteName, const std::map<std::string, std::string> * params = nullptr);
+    bool Start();
+    bool Stop();
+
+    bool SelectPeers(i2p::tunnel::Path & peers, int hops, bool inbound);
+    bool OnBuildResult(const i2p::tunnel::Path & peers, bool inbound, i2p::tunnel::TunnelBuildResult result);
+
+  private:
+    void ResolveCurrentLeaseSet();
+    void HandleFoundCurrentLeaseSet(std::shared_ptr<const i2p::data::LeaseSet> ls);
+
+  private:
+    std::string m_RemoteName;
+    i2p::data::IdentHash m_RemoteIdent;
+    std::shared_ptr<const i2p::data::LeaseSet> m_RemoteLeaseSet;
+  };
+}
+}
+
+#endif

TunnelPool.cpp

@@ -372,20 +372,8 @@ namespace tunnel
 		return hop;
 	}
 
-	bool TunnelPool::SelectPeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers, bool isInbound)
+	bool StandardSelectPeers(Path & peers, int numHops, bool inbound, SelectHopFunc nextHop)
 	{
-		int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops;
-		// peers is empty
-		if (numHops <= 0) return true; 
-		// custom peer selector in use ?
-		{
-			std::lock_guard<std::mutex> lock(m_CustomPeerSelectorMutex);
-			if (m_CustomPeerSelector)
-					return m_CustomPeerSelector->SelectPeers(peers, numHops, isInbound);
-		}
-		// explicit peers in use
-		if (m_ExplicitPeers) return SelectExplicitPeers (peers, isInbound);
-
 		auto prevHop = i2p::context.GetSharedRouterInfo ();
 		if(i2p::transport::transports.RoutesRestricted())
 		{
@@ -408,7 +396,7 @@ namespace tunnel
 
 		for(int i = 0; i < numHops; i++ )
 		{
-			auto hop = SelectNextHop (prevHop);
+			auto hop = nextHop (prevHop);
 			if (!hop)
 			{
 				LogPrint (eLogError, "Tunnels: Can't select next hop for ", prevHop->GetIdentHashBase64 ());
@@ -420,6 +408,22 @@ namespace tunnel
 		return true;
 	}
 
+	bool TunnelPool::SelectPeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers, bool isInbound)
+	{
+		int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops;
+		// peers is empty
+		if (numHops <= 0) return true;
+		// custom peer selector in use ?
+		{
+			std::lock_guard<std::mutex> lock(m_CustomPeerSelectorMutex);
+			if (m_CustomPeerSelector)
+					return m_CustomPeerSelector->SelectPeers(peers, numHops, isInbound);
+		}
+		// explicit peers in use
+		if (m_ExplicitPeers) return SelectExplicitPeers (peers, isInbound);
+		return StandardSelectPeers(peers, numHops, isInbound, std::bind(&TunnelPool::SelectNextHop, this, std::placeholders::_1));
+	}
+
 	bool TunnelPool::SelectExplicitPeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers, bool isInbound)
 	{
 		int size = m_ExplicitPeers->size ();
@@ -535,7 +539,7 @@ namespace tunnel
 		tunnel->SetTunnelPool (shared_from_this ());
 	}
 
-	void TunnelPool::SetCustomPeerSelector(TunnelPeerSelector selector)
+	void TunnelPool::SetCustomPeerSelector(ITunnelPeerSelector * selector)
 	{
 		std::lock_guard<std::mutex> lock(m_CustomPeerSelectorMutex);
 		m_CustomPeerSelector = selector;

TunnelPool.h

@@ -30,17 +30,21 @@ namespace tunnel
 		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
 	{
-		typedef std::shared_ptr<const i2p::data::IdentityEx> Peer;
-		typedef std::vector<Peer> TunnelPath;
-		
-		virtual bool SelectPeers(TunnelPath & peers, int hops, bool isInbound) = 0;
-		virtual bool OnBuildResult(TunnelPath & peers, bool isInbound, TunnelBuildResult result) = 0;
+    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::shared_ptr<ITunnelPeerSelector> TunnelPeerSelector;
+
+  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
 	{
@@ -75,7 +79,7 @@ namespace tunnel
 			int GetNumInboundTunnels () const { return m_NumInboundTunnels; };
 			int GetNumOutboundTunnels () const { return m_NumOutboundTunnels; };
 
-			void SetCustomPeerSelector(TunnelPeerSelector selector);
+			void SetCustomPeerSelector(ITunnelPeerSelector * selector);
 			void UnsetCustomPeerSelector();
 			bool HasCustomPeerSelector();
 
@@ -91,6 +95,9 @@ namespace tunnel
 
 		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 ();
@@ -98,7 +105,6 @@ namespace tunnel
 			void CreatePairedInboundTunnel (std::shared_ptr<OutboundTunnel> outboundTunnel);
 			template<class TTunnels>
 			typename TTunnels::value_type GetNextTunnel (TTunnels& tunnels, typename TTunnels::value_type excluded) const;
-			std::shared_ptr<const i2p::data::RouterInfo> SelectNextHop (std::shared_ptr<const i2p::data::RouterInfo> prevHop) 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);
 
@@ -115,7 +121,7 @@ namespace tunnel
 			std::map<uint32_t, std::pair<std::shared_ptr<OutboundTunnel>, std::shared_ptr<InboundTunnel> > > m_Tests;
 			bool m_IsActive;
 			std::mutex m_CustomPeerSelectorMutex;
-			TunnelPeerSelector m_CustomPeerSelector;
+			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
@@ -131,4 +137,3 @@ namespace tunnel
 }
 
 #endif
-

build/CMakeLists.txt

@@ -92,6 +92,7 @@ set (CLIENT_SRC
   "${CMAKE_SOURCE_DIR}/AddressBook.cpp"
   "${CMAKE_SOURCE_DIR}/BOB.cpp"
   "${CMAKE_SOURCE_DIR}/ClientContext.cpp"
+  "${CMAKE_SOURCE_DIR}/MatchedDestination.cpp"
   "${CMAKE_SOURCE_DIR}/I2PTunnel.cpp"
   "${CMAKE_SOURCE_DIR}/I2PService.cpp"
   "${CMAKE_SOURCE_DIR}/SAM.cpp"

filelist.mk

@@ -8,10 +8,9 @@ LIB_SRC = \
   Config.cpp HTTP.cpp Timestamp.cpp util.cpp api.cpp Event.cpp Gost.cpp
 
 LIB_CLIENT_SRC = \
-	AddressBook.cpp BOB.cpp ClientContext.cpp I2PTunnel.cpp I2PService.cpp \
+	AddressBook.cpp BOB.cpp ClientContext.cpp I2PTunnel.cpp I2PService.cpp MatchedDestination.cpp \
 	SAM.cpp SOCKS.cpp HTTPProxy.cpp I2CP.cpp WebSocks.cpp
 
 # also: Daemon{Linux,Win32}.cpp will be added later
 DAEMON_SRC = \
 	HTTPServer.cpp I2PControl.cpp UPnP.cpp Daemon.cpp i2pd.cpp
-