handle session handshakes in separate thread

libi2pd/NTCP2.cpp

@@ -491,7 +491,6 @@ namespace transport
 
 	void NTCP2Session::HandleSessionRequestReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
 	{
-		(void) bytes_transferred;
 		if (ecode)
 		{
 			LogPrint (eLogWarning, "NTCP2: SessionRequest read error: ", ecode.message ());
@@ -499,7 +498,17 @@ namespace transport
 		}
 		else
 		{
-			LogPrint (eLogDebug, "NTCP2: SessionRequest received ", bytes_transferred);
+			boost::asio::post (m_Server.GetEstablisherService (), 
+				[s = shared_from_this (), bytes_transferred] ()
+				{
+					s->ProcessSessionRequest (bytes_transferred);;
+				});	
+		}
+	}
+
+	void NTCP2Session::ProcessSessionRequest (size_t len)
+	{
+		LogPrint (eLogDebug, "NTCP2: SessionRequest received ", len);
 		uint16_t paddingLen = 0;
 		bool clockSkew = false;
 		if (m_Establisher->ProcessSessionRequestMessage (paddingLen, clockSkew))
@@ -520,15 +529,14 @@ namespace transport
 				else
 				{
 					LogPrint (eLogWarning, "NTCP2: SessionRequest padding length ", (int)paddingLen, " is too long");
-						Terminate ();
+					boost::asio::post (m_Server.GetService (), std::bind (&NTCP2Session::Terminate, shared_from_this ()));
 				}
 			}
 			else
 				SendSessionCreated ();
 		}
 		else
-				Terminate ();
-		}
+			boost::asio::post (m_Server.GetService (), std::bind (&NTCP2Session::Terminate, shared_from_this ()));
 	}	
 		
 	void NTCP2Session::HandleSessionRequestPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
@@ -539,7 +547,13 @@ namespace transport
 			Terminate ();
 		}
 		else
-			SendSessionCreated ();
+		{
+			boost::asio::post (m_Server.GetEstablisherService (), 
+				[s = shared_from_this ()] ()
+				{
+					s->SendSessionCreated ();
+				});	
+		}	
 	}
 
 	void NTCP2Session::SendSessionCreated ()
@@ -561,7 +575,17 @@ namespace transport
 		else
 		{
 			m_HandshakeInterval = i2p::util::GetMillisecondsSinceEpoch () - m_HandshakeInterval;
-			LogPrint (eLogDebug, "NTCP2: SessionCreated received ", bytes_transferred);
+			boost::asio::post (m_Server.GetEstablisherService (), 
+				[s = shared_from_this (), bytes_transferred] ()
+				{
+					s->ProcessSessionCreated (bytes_transferred);
+				});	
+		}
+	}
+
+	void NTCP2Session::ProcessSessionCreated (size_t len)
+	{
+		LogPrint (eLogDebug, "NTCP2: SessionCreated received ", len);
 		uint16_t paddingLen = 0;
 		if (m_Establisher->ProcessSessionCreatedMessage (paddingLen))
 		{
@@ -575,7 +599,7 @@ namespace transport
 				else
 				{
 					LogPrint (eLogWarning, "NTCP2: SessionCreated padding length ", (int)paddingLen, " is too long");
-						Terminate ();
+					boost::asio::post (m_Server.GetService (), std::bind (&NTCP2Session::Terminate, shared_from_this ()));
 				}
 			}
 			else
@@ -585,8 +609,7 @@ namespace transport
 		{
 			if (GetRemoteIdentity ())
 				i2p::data::netdb.SetUnreachable (GetRemoteIdentity ()->GetIdentHash (), true);  // assume wrong s key
-				Terminate ();
-			}	
+			boost::asio::post (m_Server.GetService (), std::bind (&NTCP2Session::Terminate, shared_from_this ()));
 		}	
 	}	
 		
@@ -600,7 +623,11 @@ namespace transport
 		else
 		{
 			m_Establisher->m_SessionCreatedBufferLen += bytes_transferred;
-			SendSessionConfirmed ();
+			boost::asio::post (m_Server.GetEstablisherService (), 
+				[s = shared_from_this ()] ()
+				{
+					s->SendSessionConfirmed ();
+				});	
 		}
 	}
 
@@ -679,7 +706,7 @@ namespace transport
 				// part 2
 				std::vector<uint8_t> buf(m_Establisher->m3p2Len - 16); // -MAC
 				memset (nonce, 0, 12); // set nonce to 0 again
-				if (m_Establisher->ProcessSessionConfirmedMessagePart2 (nonce, buf.data ()))
+				if (m_Establisher->ProcessSessionConfirmedMessagePart2 (nonce, buf.data ())) // TODO:handle in establisher thread
 				{
 					KeyDerivationFunctionDataPhase ();
 					// Bob data phase keys
@@ -811,7 +838,11 @@ namespace transport
 	void NTCP2Session::ClientLogin ()
 	{
 		m_Establisher->CreateEphemeralKey ();
-		SendSessionRequest ();
+		boost::asio::post (m_Server.GetEstablisherService (), 
+		    [s = shared_from_this ()] ()
+			{
+				s->SendSessionRequest ();
+			});	
 	}
 
 	void NTCP2Session::ServerLogin ()
@@ -1367,6 +1398,7 @@ namespace transport
 
 	void NTCP2Server::Start ()
 	{
+		m_EstablisherService.Start ();
 		if (!IsRunning ())
 		{
 			StartIOService ();
@@ -1476,6 +1508,7 @@ namespace transport
 			m_TerminationTimer.cancel ();
 			m_ProxyEndpoint = nullptr;
 		}
+		m_EstablisherService.Stop ();
 		StopIOService ();
 	}
 

libi2pd/NTCP2.h

@@ -172,9 +172,11 @@ namespace transport
 
 			void HandleSessionRequestSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleSessionRequestReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
+			void ProcessSessionRequest (size_t len);
 			void HandleSessionRequestPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleSessionCreatedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleSessionCreatedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
+			void ProcessSessionCreated (size_t len);
 			void HandleSessionCreatedPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleSessionConfirmedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleSessionConfirmedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
@@ -239,6 +241,18 @@ namespace transport
 
 	class NTCP2Server: private i2p::util::RunnableServiceWithWork
 	{
+		private:
+
+			class EstablisherService: public i2p::util::RunnableServiceWithWork
+			{
+				public:
+
+					EstablisherService (): RunnableServiceWithWork ("NTCP2e") {};
+					auto& GetService () { return GetIOService (); };
+					void Start () { StartIOService (); };
+					void Stop () { StopIOService (); };
+			};
+			
 		public:
 
 			enum ProxyType
@@ -254,6 +268,7 @@ namespace transport
 			void Start ();
 			void Stop ();
 			auto& GetService () { return GetIOService (); };
+			auto& GetEstablisherService () { return m_EstablisherService.GetService (); };
 			std::mt19937& GetRng () { return m_Rng; };
 
 			bool AddNTCP2Session (std::shared_ptr<NTCP2Session> session, bool incoming = false);
@@ -294,6 +309,7 @@ namespace transport
 			std::unique_ptr<boost::asio::ip::tcp::endpoint> m_ProxyEndpoint;
 			std::shared_ptr<boost::asio::ip::tcp::endpoint> m_Address4, m_Address6, m_YggdrasilAddress;
 			std::mt19937 m_Rng;
+			EstablisherService m_EstablisherService;
 			
 		public: