drop incoming SSU2 session from duplicated router

libi2pd/Profiling.h

@@ -66,6 +66,7 @@ namespace data
 			bool IsUpdated () const { return m_IsUpdated; };
 			
 			bool IsUseful() const;
+			bool IsDuplicated () const { return m_IsDuplicated; };
 			
 		private:
 

libi2pd/SSU2Session.cpp

@@ -1132,10 +1132,14 @@ namespace transport
 			LogPrint (eLogError, "SSU2: Couldn't update RouterInfo from SessionConfirmed in netdb");
 			return false;
 		}
-		bool isOlder = false;
+		std::shared_ptr<i2p::data::RouterProfile> profile; // not null if older 
 		if (ri->GetTimestamp () + i2p::data::NETDB_EXPIRATION_TIMEOUT_THRESHOLD*1000LL < ri1->GetTimestamp ())
+		{	
 			// received RouterInfo is older than one in netdb
-			isOlder = true;	
+			profile = i2p::data::GetRouterProfile (ri->GetIdentHash ()); // retrieve profile	
+			if (profile && profile->IsDuplicated ())
+				return false;
+		}	
 		ri = ri1;
 		
 		m_Address = m_RemoteEndpoint.address ().is_v6 () ? ri->GetSSU2V6Address () : ri->GetSSU2V4Address ();
@@ -1148,11 +1152,8 @@ namespace transport
 		    (!m_RemoteEndpoint.address ().is_v6 () ||
 			 memcmp (m_RemoteEndpoint.address ().to_v6 ().to_bytes ().data (), m_Address->host.to_v6 ().to_bytes ().data (), 8))) // temporary address
 		{
-			if (isOlder)
-			{
-				auto profile = i2p::data::GetRouterProfile (ri->GetIdentHash ());
-				if (profile) profile->Duplicated (); // mark router as duplicated in profile
-			}	
+			if (profile) // older router?
+				profile->Duplicated (); // mark router as duplicated in profile
 			else	
 				LogPrint (eLogError, "SSU2: Host mismatch between published address ", m_Address->host,
 					" and actual endpoint ", m_RemoteEndpoint.address (), " from ", i2p::data::GetIdentHashAbbreviation (ri->GetIdentHash ()));