Merge pull request #1169 from majestrate/master

SAM fixes

daemon/HTTPServer.cpp

@@ -660,7 +660,7 @@ namespace http {
 		s << i2p::client::context.GetAddressBook ().ToAddress(ident) << "</a><br>\r\n";
 		s << "<br>\r\n";
 		s << "<b>Streams:</b><br>\r\n";
-		for (const auto& it: session->ListSockets())
+		for (const auto& it: sam->ListSockets(id))
 		{
 			switch (it->GetSocketType ())
 			{

daemon/I2PControl.cpp

@@ -727,7 +727,7 @@ namespace client
 				sam_session.put("name", name);
 				sam_session.put("address", i2p::client::context.GetAddressBook ().ToAddress(ident));
 
-				for (const auto& socket: it.second->ListSockets())
+				for (const auto& socket: sam->ListSockets(it.first))
 				{
 					boost::property_tree::ptree stream;
 					stream.put("type", socket->GetSocketType ());

libi2pd/HTTP.cpp

@@ -96,7 +96,7 @@ namespace http {
       pos_c = url.find('@', pos_p); /* find end of 'user' or 'user:pass' part */
       if (pos_c != std::string::npos && (pos_s == std::string::npos || pos_s > pos_c)) {
         std::size_t delim = url.find(':', pos_p);
-        if (delim != std::string::npos && delim < pos_c) {
+        if (delim && delim != std::string::npos && delim < pos_c) {
           user = url.substr(pos_p, delim - pos_p);
           delim += 1;
           pass = url.substr(delim, pos_c - delim);

libi2pd/Streaming.cpp

@@ -578,9 +578,7 @@ namespace stream
 				if (m_SentPackets.empty () && m_SendBuffer.IsEmpty ()) // nothing to send
 				{
 					m_Status = eStreamStatusClosed;
-					// close could be called from another thread so do SendClose from the destination thread
+					SendClose();
-					// this is so m_LocalDestination.NewPacket () does not trigger a race condition
-					m_Service.post(std::bind(&Stream::SendClose, shared_from_this()));
 				}
 			break;
 			case eStreamStatusClosed:

libi2pd/Streaming.h

@@ -165,6 +165,9 @@ namespace stream
 			void AsyncReceive (const Buffer& buffer, ReceiveHandler handler, int timeout = 0);
 			size_t ReadSome (uint8_t * buf, size_t len) { return ConcatenatePackets (buf, len); };
 
+			void AsyncClose() { m_Service.post(std::bind(&Stream::Close, shared_from_this())); };
+
+			/** only call close from destination thread, use Stream::AsyncClose for other threads */
 			void Close ();
 			void Cancel () { m_ReceiveTimer.cancel (); };
 

libi2pd_client/SAM.cpp

@@ -15,8 +15,8 @@ namespace i2p
 {
 namespace client
 {
-	SAMSocket::SAMSocket (SAMBridge& owner, std::shared_ptr<Socket_t> socket):
+	SAMSocket::SAMSocket (SAMBridge& owner):
-		m_Owner (owner), m_Socket(socket), m_Timer (m_Owner.GetService ()),
+		m_Owner (owner), m_Socket(owner.GetService()), m_Timer (m_Owner.GetService ()),
 		m_BufferOffset (0), 
 		m_SocketType (eSAMSocketTypeUnknown), m_IsSilent (false),
 		m_IsAccepting (false), m_Stream (nullptr)
@@ -25,51 +25,17 @@ namespace client
 
 	SAMSocket::~SAMSocket ()
 	{
-		if(m_Stream)
+		m_Stream = nullptr;
-		{
-			m_Stream->Close ();
-			m_Stream.reset ();
-		}
-		auto Session = m_Owner.FindSession(m_ID);
-		
-		switch (m_SocketType)
-		{
-			case eSAMSocketTypeSession:
-				m_Owner.CloseSession (m_ID);
-			break;
-			case eSAMSocketTypeStream:
-			{
-				if (Session)
-					Session->DelSocket (this);
-				break;
-			}
-			case eSAMSocketTypeAcceptor:
-			{
-				if (Session)
-				{
-					Session->DelSocket (this);
-					if (m_IsAccepting && Session->localDestination)
-						Session->localDestination->StopAcceptingStreams ();
-				}
-				break;
-			}
-			default:
-				;
-		}
-		m_SocketType = eSAMSocketTypeTerminated;
-		if (m_Socket && m_Socket->is_open()) m_Socket->close ();
-		m_Socket.reset ();
 	}	
 
 	void SAMSocket::Terminate (const char* reason)
 	{
 		if(m_Stream)
 		{
-			m_Stream->Close ();
+			m_Stream->AsyncClose ();
-			m_Stream.reset ();
+			m_Stream = nullptr;
 		}
 		auto Session = m_Owner.FindSession(m_ID);
-		
 		switch (m_SocketType)
 		{
 			case eSAMSocketTypeSession:
@@ -77,15 +43,12 @@ namespace client
 			break;
 			case eSAMSocketTypeStream:
 			{
-				if (Session)
-					Session->DelSocket (this);
 				break;
 			}
 			case eSAMSocketTypeAcceptor:
 			{
 				if (Session)
 				{
-					Session->DelSocket (this);
 					if (m_IsAccepting && Session->localDestination)
 						Session->localDestination->StopAcceptingStreams ();
 				}
@@ -95,16 +58,20 @@ namespace client
 				;
 		}
 		m_SocketType = eSAMSocketTypeTerminated;
-		if (m_Socket && m_Socket->is_open()) m_Socket->close ();
+		if (m_Socket.is_open ())
-		m_Socket.reset ();
+		{
+			boost::system::error_code ec;
+			m_Socket.shutdown (boost::asio::ip::tcp::socket::shutdown_both, ec);
+			m_Socket.close ();
+		}
+		m_Owner.RemoveSocket(shared_from_this());
 	}
 
 	void SAMSocket::ReceiveHandshake ()
-	{
+	{		
-		if(m_Socket)
+		m_Socket.async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE),
-			m_Socket->async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE),
+			std::bind(&SAMSocket::HandleHandshakeReceived, shared_from_this (),
-				std::bind(&SAMSocket::HandleHandshakeReceived, shared_from_this (),
+			std::placeholders::_1, std::placeholders::_2));
-				std::placeholders::_1, std::placeholders::_2));
 	}
 
 	static bool SAMVersionAcceptable(const std::string & ver)
@@ -125,7 +92,7 @@ namespace client
 	void SAMSocket::HandleHandshakeReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
 	{
 		if (ecode)
-        {
+		{
 			LogPrint (eLogError, "SAM: handshake read error: ", ecode.message ());
 			if (ecode != boost::asio::error::operation_aborted)
 				Terminate ("SAM: handshake read error");
@@ -184,7 +151,7 @@ namespace client
 #else
 					size_t l = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_HANDSHAKE_REPLY, version.c_str ());
 #endif
-					boost::asio::async_write (*m_Socket, boost::asio::buffer (m_Buffer, l), boost::asio::transfer_all (),
+					boost::asio::async_write (m_Socket, boost::asio::buffer (m_Buffer, l), boost::asio::transfer_all (),
 								std::bind(&SAMSocket::HandleHandshakeReplySent, shared_from_this (),
 						std::placeholders::_1, std::placeholders::_2));
 				}
@@ -199,17 +166,22 @@ namespace client
 		}
 	}
 
+	bool SAMSocket::IsSession(const std::string & id) const
+	{
+		return id == m_ID;
+	}
+	
 	void SAMSocket::HandleHandshakeReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
 	{
 		if (ecode)
-        {
+		{
 			LogPrint (eLogError, "SAM: handshake reply send error: ", ecode.message ());
 			if (ecode != boost::asio::error::operation_aborted)
 				Terminate ("SAM: handshake reply send error");
 		}
-		else if(m_Socket)
+		else
 		{
-			m_Socket->async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE),
+			m_Socket.async_read_some (boost::asio::buffer(m_Buffer, SAM_SOCKET_BUFFER_SIZE),
 				std::bind(&SAMSocket::HandleMessage, shared_from_this (),
 				std::placeholders::_1, std::placeholders::_2));
 		}
@@ -220,7 +192,7 @@ namespace client
 		LogPrint (eLogDebug, "SAMSocket::SendMessageReply, close=",close?"true":"false", " reason: ", msg);
 
 		if (!m_IsSilent)
-			boost::asio::async_write (*m_Socket, boost::asio::buffer (msg, len), boost::asio::transfer_all (),
+			boost::asio::async_write (m_Socket, boost::asio::buffer (msg, len), boost::asio::transfer_all (),
 				std::bind(&SAMSocket::HandleMessageReplySent, shared_from_this (),
 				std::placeholders::_1, std::placeholders::_2, close));
 		else
@@ -235,7 +207,7 @@ namespace client
 	void SAMSocket::HandleMessageReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred, bool close)
 	{
 		if (ecode)
-        {
+		{
 			LogPrint (eLogError, "SAM: reply send error: ", ecode.message ());
 			if (ecode != boost::asio::error::operation_aborted)
 				Terminate ("SAM: reply send error");
@@ -252,7 +224,7 @@ namespace client
 	void SAMSocket::HandleMessage (const boost::system::error_code& ecode, std::size_t bytes_transferred)
 	{
 		if (ecode)
-        {
+		{
 			LogPrint (eLogError, "SAM: read error: ", ecode.message ());
 			if (ecode != boost::asio::error::operation_aborted)
 				Terminate ("SAM: read error");
@@ -501,7 +473,6 @@ namespace client
 		if(session)
 		{
 			m_SocketType = eSAMSocketTypeStream;
-			session->AddSocket (shared_from_this ());
 			m_Stream = session->localDestination->CreateStream (remote);
 			m_Stream->Send ((uint8_t *)m_Buffer, m_BufferOffset); // connect and send
 			m_BufferOffset = 0;
@@ -534,7 +505,6 @@ namespace client
 		if (session)
 		{
 			m_SocketType = eSAMSocketTypeAcceptor;
-			session->AddSocket (shared_from_this ());
 			if (!session->localDestination->IsAcceptingStreams ())
 			{
 				m_IsAccepting = true;	
@@ -599,7 +569,7 @@ namespace client
 			keys.GetPublic ()->ToBase64 ().c_str (), keys.ToBase64 ().c_str ());
 #else
 		size_t l = snprintf (m_Buffer, SAM_SOCKET_BUFFER_SIZE, SAM_DEST_REPLY,
-		    keys.GetPublic ()->ToBase64 ().c_str (), keys.ToBase64 ().c_str ());
+			keys.GetPublic ()->ToBase64 ().c_str (), keys.ToBase64 ().c_str ());
 #endif
 		SendMessageReply (m_Buffer, l, false);
 	}
@@ -704,17 +674,9 @@ namespace client
 
 	void SAMSocket::Receive ()
 	{
-		if (m_BufferOffset >= SAM_SOCKET_BUFFER_SIZE)
+		m_Socket.async_read_some (boost::asio::buffer(m_Buffer + m_BufferOffset, SAM_SOCKET_BUFFER_SIZE - m_BufferOffset),
-		{
+			std::bind((m_SocketType == eSAMSocketTypeStream) ? &SAMSocket::HandleReceived : &SAMSocket::HandleMessage,
-			LogPrint (eLogError, "SAM: Buffer is full, terminate");
+			shared_from_this (), std::placeholders::_1, std::placeholders::_2));
-			Terminate ("Buffer is full");
-			return;
-		} else if (m_Socket)
-			m_Socket->async_read_some (boost::asio::buffer(m_Buffer + m_BufferOffset, SAM_SOCKET_BUFFER_SIZE - m_BufferOffset),
-				std::bind((m_SocketType == eSAMSocketTypeStream) ? &SAMSocket::HandleReceived : &SAMSocket::HandleMessage,
-				shared_from_this (), std::placeholders::_1, std::placeholders::_2));
-		else
-			LogPrint(eLogError, "SAM: receive with no native socket");
 	}
 
 	void SAMSocket::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
@@ -731,15 +693,12 @@ namespace client
 			{
 				bytes_transferred += m_BufferOffset;
 				m_BufferOffset = 0;
-				auto s = shared_from_this ();
 				m_Stream->AsyncSend ((uint8_t *)m_Buffer, bytes_transferred,
-					[s](const boost::system::error_code& ecode)
+					std::bind(&SAMSocket::HandleStreamSend, shared_from_this(), std::placeholders::_1));
-				    {
+			}
-						if (!ecode)
+			else
-							s->m_Owner.GetService ().post ([s] { s->Receive (); });
+			{
-						else	
+				Terminate("No Stream Remaining");
-							s->m_Owner.GetService ().post ([s] { s->Terminate ("AsyncSend failed"); });
-					});
 			}
 		}
 	}
@@ -766,21 +725,21 @@ namespace client
 					WriteI2PDataImmediate(buff, len);
 				}
 				else // no more data
+				{
+					delete [] buff;
 					Terminate ("no more data");
+				}
 			}
 		}
 	}
 
 	void SAMSocket::WriteI2PDataImmediate(uint8_t * buff, size_t sz)
 	{
-		if(m_Socket)
+		boost::asio::async_write (
-			boost::asio::async_write (
+			m_Socket,
-				*m_Socket,
+			boost::asio::buffer (buff, sz),
-				boost::asio::buffer (buff, sz),
+			boost::asio::transfer_all(),
-				boost::asio::transfer_all(),
+			std::bind (&SAMSocket::HandleWriteI2PDataImmediate, shared_from_this (), std::placeholders::_1, buff)); // postpone termination
-				std::bind (&SAMSocket::HandleWriteI2PDataImmediate, shared_from_this (), std::placeholders::_1, buff)); // postpone termination
-		else
-			LogPrint(eLogError, "SAM: no native socket");
 	}
 
 	void SAMSocket::HandleWriteI2PDataImmediate(const boost::system::error_code & ec, uint8_t * buff)
@@ -790,9 +749,11 @@ namespace client
 	
 	void SAMSocket::WriteI2PData(size_t sz)
 	{
-		uint8_t * sendbuff = new uint8_t[sz];
+		boost::asio::async_write (
-		memcpy(sendbuff, m_StreamBuffer, sz);
+			m_Socket,
-		WriteI2PDataImmediate(sendbuff, sz);
+			boost::asio::buffer (m_StreamBuffer, sz),
+			boost::asio::transfer_all(),
+			std::bind(&SAMSocket::HandleWriteI2PData, shared_from_this(), std::placeholders::_1, std::placeholders::_2));
 	}
 	
 	void SAMSocket::HandleI2PReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred)
@@ -826,7 +787,8 @@ namespace client
 				{
 					WriteI2PData(bytes_transferred);
 				}
-				I2PReceive();
+				else
+					I2PReceive();
 			}
 		}
 	}
@@ -858,7 +820,7 @@ namespace client
 			if (session)
 			{
 				// find more pending acceptors
-				for (auto it: session->ListSockets ())
+				for (auto & it: m_Owner.ListSockets (m_ID))
 					if (it->m_SocketType == eSAMSocketTypeAcceptor)
 					{
 						it->m_IsAccepting = true;
@@ -930,29 +892,30 @@ namespace client
 		}
 	}
 
-	SAMSession::SAMSession (std::shared_ptr<ClientDestination> dest):
+	void SAMSocket::HandleStreamSend(const boost::system::error_code & ec)
+	{
+		m_Owner.GetService ().post (std::bind( !ec ? &SAMSocket::Receive : &SAMSocket::TerminateClose, shared_from_this()));
+	}
+	
+	SAMSession::SAMSession (SAMBridge & parent, const std::string & id, std::shared_ptr<ClientDestination> dest):
+		m_Bridge(parent),
 		localDestination (dest),
-		UDPEndpoint(nullptr)
+		UDPEndpoint(nullptr),
+		Name(id)
 	{
 	}
-
+	
 	SAMSession::~SAMSession ()
 	{
-		CloseStreams();
 		i2p::client::context.DeleteLocalDestination (localDestination);
 	}
 
 	void SAMSession::CloseStreams ()
 	{
-		std::vector<std::shared_ptr<SAMSocket> > socks;
+		for(const auto & itr : m_Bridge.ListSockets(Name))
 		{
-			std::lock_guard<std::mutex> lock(m_SocketsMutex);
+			itr->Terminate(nullptr);
-			for (const auto& sock : m_Sockets) {
-				socks.push_back(sock);
-			}
 		}
-                for (auto & sock : socks ) sock->Terminate("SAMSession::CloseStreams()");
-		m_Sockets.clear();
 	}
 
 	SAMBridge::SAMBridge (const std::string& address, int port):
@@ -1009,12 +972,17 @@ namespace client
 
 	void SAMBridge::Accept ()
 	{
-		auto native = std::make_shared<boost::asio::ip::tcp::socket>(m_Service);
+		auto newSocket = std::make_shared<SAMSocket>(*this);
-		auto newSocket = std::make_shared<SAMSocket> (*this, native);
+		m_Acceptor.async_accept (newSocket->GetSocket(), std::bind (&SAMBridge::HandleAccept, this,
-		m_Acceptor.async_accept (*native, std::bind (&SAMBridge::HandleAccept, this,
 			std::placeholders::_1, newSocket));
 	}
 
+	void SAMBridge::RemoveSocket(const std::shared_ptr<SAMSocket> & socket)
+	{
+		std::unique_lock<std::mutex> lock(m_OpenSocketsMutex);
+		m_OpenSockets.remove_if([socket](const std::shared_ptr<SAMSocket> & item) -> bool { return item == socket; });
+	}
+	
 	void SAMBridge::HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<SAMSocket> socket)
 	{
 		if (!ecode)
@@ -1024,6 +992,10 @@ namespace client
 			if (!ec)
 			{
 				LogPrint (eLogDebug, "SAM: new connection from ", ep);
+				{
+					std::unique_lock<std::mutex> l(m_OpenSocketsMutex);
+					m_OpenSockets.push_back(socket);
+				}
 				socket->ReceiveHandshake ();
 			}
 			else
@@ -1066,7 +1038,7 @@ namespace client
 		if (localDestination)
 		{
 			localDestination->Acquire ();
-			auto session = std::make_shared<SAMSession>(localDestination);
+			auto session = std::make_shared<SAMSession>(*this, id, localDestination);
 			std::unique_lock<std::mutex> l(m_SessionsMutex);
 			auto ret = m_Sessions.insert (std::make_pair(id, session));
 			if (!ret.second)
@@ -1105,6 +1077,18 @@ namespace client
 		return nullptr;
 	}
 
+	std::list<std::shared_ptr<SAMSocket> > SAMBridge::ListSockets(const std::string & id) const
+	{
+		std::list<std::shared_ptr<SAMSocket > > list;
+		{
+			std::unique_lock<std::mutex> l(m_OpenSocketsMutex);
+			for (const auto & itr : m_OpenSockets)
+				if (itr->IsSession(id))
+					list.push_back(itr);
+		}
+		return list;
+	}
+	
 	void SAMBridge::SendTo(const uint8_t * buf, size_t len, std::shared_ptr<boost::asio::ip::udp::endpoint> remote)
 	{
 		if(remote)
@@ -1127,33 +1111,38 @@ namespace client
 		{
 			m_DatagramReceiveBuffer[bytes_transferred] = 0;
 			char * eol = strchr ((char *)m_DatagramReceiveBuffer, '\n');
-			*eol = 0; eol++;
+			if(eol)
-			size_t payloadLen = bytes_transferred - ((uint8_t *)eol - m_DatagramReceiveBuffer);
-			LogPrint (eLogDebug, "SAM: datagram received ", m_DatagramReceiveBuffer," size=", payloadLen);
-			char * sessionID = strchr ((char *)m_DatagramReceiveBuffer, ' ');
-			if (sessionID)
 			{
-				sessionID++;
+				*eol = 0; eol++;
-				char * destination = strchr (sessionID, ' ');
+				size_t payloadLen = bytes_transferred - ((uint8_t *)eol - m_DatagramReceiveBuffer);
-				if (destination)
+				LogPrint (eLogDebug, "SAM: datagram received ", m_DatagramReceiveBuffer," size=", payloadLen);
+				char * sessionID = strchr ((char *)m_DatagramReceiveBuffer, ' ');
+				if (sessionID)
 				{
-					*destination = 0; destination++;
+					sessionID++;
-					auto session = FindSession (sessionID);
+					char * destination = strchr (sessionID, ' ');
-					if (session)
+					if (destination)
 					{
-						i2p::data::IdentityEx dest;
+						*destination = 0; destination++;
-						dest.FromBase64 (destination);
+						auto session = FindSession (sessionID);
-						session->localDestination->GetDatagramDestination ()->
+						if (session)
-							SendDatagramTo ((uint8_t *)eol, payloadLen, dest.GetIdentHash ());
+						{
+							i2p::data::IdentityEx dest;
+							dest.FromBase64 (destination);
+							session->localDestination->GetDatagramDestination ()->
+								SendDatagramTo ((uint8_t *)eol, payloadLen, dest.GetIdentHash ());
+						}
+						else
+							LogPrint (eLogError, "SAM: Session ", sessionID, " not found");
 					}
 					else
-						LogPrint (eLogError, "SAM: Session ", sessionID, " not found");
+						LogPrint (eLogError, "SAM: Missing destination key");
 				}
 				else
-					LogPrint (eLogError, "SAM: Missing destination key");
+					LogPrint (eLogError, "SAM: Missing sessionID");
 			}
 			else
-				LogPrint (eLogError, "SAM: Missing sessionID");
+				LogPrint(eLogError, "SAM: invalid datagram");
 			ReceiveDatagram ();
 		}
 		else

libi2pd_client/SAM.h

@@ -82,18 +82,21 @@ namespace client
 		public:
 
 			typedef boost::asio::ip::tcp::socket Socket_t;
-			SAMSocket (SAMBridge& owner, std::shared_ptr<Socket_t> socket);
+			SAMSocket (SAMBridge& owner);
 			~SAMSocket ();			
 
-			boost::asio::ip::tcp::socket& GetSocket () { return *m_Socket; };
+			Socket_t& GetSocket () { return m_Socket; };
 			void ReceiveHandshake ();
 			void SetSocketType (SAMSocketType socketType) { m_SocketType = socketType; };
 			SAMSocketType GetSocketType () const { return m_SocketType; };
 
 			void Terminate (const char* reason);
 
+			bool IsSession(const std::string & id) const;
+		
 		 private:
-
+			void TerminateClose() { Terminate(nullptr); }
+		
 			void HandleHandshakeReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleHandshakeReplySent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
 			void HandleMessage (const boost::system::error_code& ecode, std::size_t bytes_transferred);
@@ -128,10 +131,12 @@ namespace client
 			void WriteI2PDataImmediate(uint8_t * ptr, size_t sz);
 
 			void HandleWriteI2PDataImmediate(const boost::system::error_code & ec, uint8_t * buff);
+			void HandleStreamSend(const boost::system::error_code & ec);
+		
 		private:
 
 			SAMBridge& m_Owner;
-			std::shared_ptr<Socket_t> m_Socket;
+			Socket_t m_Socket;
 			boost::asio::deadline_timer m_Timer;
 			char m_Buffer[SAM_SOCKET_BUFFER_SIZE + 1];
 			size_t m_BufferOffset;
@@ -145,34 +150,12 @@ namespace client
 
 	struct SAMSession
 	{
+		SAMBridge & m_Bridge;
 		std::shared_ptr<ClientDestination> localDestination;
-		std::list<std::shared_ptr<SAMSocket> > m_Sockets;
 		std::shared_ptr<boost::asio::ip::udp::endpoint> UDPEndpoint;
-		std::mutex m_SocketsMutex;
+		std::string Name;
-
+
-		/** safely add a socket to this session */
+		SAMSession (SAMBridge & parent, const std::string & name, std::shared_ptr<ClientDestination> dest);
-		void AddSocket(std::shared_ptr<SAMSocket> sock) {
-			std::lock_guard<std::mutex> lock(m_SocketsMutex);
-			m_Sockets.push_back(sock);
-		}
-
-		/** safely remove a socket from this session */
-		void DelSocket(SAMSocket * sock) {
-			std::lock_guard<std::mutex> lock(m_SocketsMutex);
-			m_Sockets.remove_if([sock](const std::shared_ptr<SAMSocket> s) -> bool { return s.get() == sock; });
-		}
-
-		/** get a list holding a copy of all sam sockets from this session */
-		std::list<std::shared_ptr<SAMSocket> > ListSockets() {
-			std::list<std::shared_ptr<SAMSocket> > l;
-			{
-				std::lock_guard<std::mutex> lock(m_SocketsMutex);
-				for(const auto& sock : m_Sockets ) l.push_back(sock);
-			}
-			return l;
-		}
-
-		SAMSession (std::shared_ptr<ClientDestination> dest);
 		~SAMSession ();
 
 		void CloseStreams ();
@@ -189,14 +172,18 @@ namespace client
 			void Stop ();
 
 			boost::asio::io_service& GetService () { return m_Service; };
-			std::shared_ptr<SAMSession> CreateSession (const std::string& id, const std::string& destination, // empty string  means transient
+			std::shared_ptr<SAMSession> CreateSession (const std::string& id, const std::string& destination, // empty string	 means transient
 				const std::map<std::string, std::string> * params);
 			void CloseSession (const std::string& id);
 			std::shared_ptr<SAMSession> FindSession (const std::string& id) const;
 
+			std::list<std::shared_ptr<SAMSocket> > ListSockets(const std::string & id) const;
+
 			/** send raw data to remote endpoint from our UDP Socket */
 			void SendTo(const uint8_t * buf, size_t len, std::shared_ptr<boost::asio::ip::udp::endpoint> remote);
 
+			void RemoveSocket(const std::shared_ptr<SAMSocket> & socket);
+		
 		private:
 
 			void Run ();
@@ -217,6 +204,8 @@ namespace client
 			boost::asio::ip::udp::socket m_DatagramSocket;
 			mutable std::mutex m_SessionsMutex;
 			std::map<std::string, std::shared_ptr<SAMSession> > m_Sessions;
+			mutable std::mutex m_OpenSocketsMutex;
+			std::list<std::shared_ptr<SAMSocket> > m_OpenSockets;
 			uint8_t m_DatagramReceiveBuffer[i2p::datagram::MAX_DATAGRAM_SIZE+1];
 
 		public: