clean obsolete SSU data

SSUData.cpp

@@ -11,7 +11,8 @@ namespace i2p
 namespace transport
 {
 	SSUData::SSUData (SSUSession& session):
-		m_Session (session), m_ResendTimer (session.m_Server.GetService ())
+		m_Session (session), m_ResendTimer (session.GetService ()), m_DecayTimer (session.GetService ()),
+		m_IncompleteMessagesCleanupTimer (session.GetService ())
 	{
 		m_MaxPacketSize = session.IsV6 () ? SSU_V6_MAX_PACKET_SIZE : SSU_V4_MAX_PACKET_SIZE;
 		m_PacketSize = m_MaxPacketSize;
@@ -28,9 +29,16 @@ namespace transport
 			delete it.second;
 	}
 
+	void SSUData::Start ()
+	{
+		ScheduleIncompleteMessagesCleanup ();
+	}	
+		
 	void SSUData::Stop ()
 	{
 		m_ResendTimer.cancel ();
+		m_DecayTimer.cancel ();
+		m_IncompleteMessagesCleanupTimer.cancel ();
 	}	
 		
 	void SSUData::AdjustPacketSize (const i2p::data::RouterInfo& remoteRouter)
@@ -209,7 +217,9 @@ namespace transport
 					// missing fragment
 					LogPrint (eLogWarning, "Missing fragments from ", (int)incompleteMessage->nextFragmentNum, " to ", fragmentNum - 1, " of message ", msgID);	
 					auto savedFragment = new Fragment (fragmentNum, buf, fragmentSize, isLast);
-					if (!incompleteMessage->savedFragments.insert (std::unique_ptr<Fragment>(savedFragment)).second)
+					if (incompleteMessage->savedFragments.insert (std::unique_ptr<Fragment>(savedFragment)).second)
+						incompleteMessage->lastFragmentInsertTime = i2p::util::GetSecondsSinceEpoch ();
+					else	
 						LogPrint (eLogWarning, "Fragment ", (int)fragmentNum, " of message ", msgID, " already saved");
 				}
 				isLast = false;
@@ -228,7 +238,10 @@ namespace transport
 				{
 					if (!m_ReceivedMessages.count (msgID))
 					{	
-						if (m_ReceivedMessages.size () > 100) m_ReceivedMessages.clear ();
+						if (m_ReceivedMessages.size () > MAX_NUM_RECEIVED_MESSAGES)
+							m_ReceivedMessages.clear ();
+						else
+							ScheduleDecay ();
 						m_ReceivedMessages.insert (msgID);
 						m_Handler.PutNextMessage (msg);
 					}	
@@ -407,20 +420,76 @@ namespace transport
 		if (ecode != boost::asio::error::operation_aborted)
 		{
 			uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
-			for (auto it : m_SentMessages)
+			for (auto it = m_SentMessages.begin (); it != m_SentMessages.end ();)
 			{
-				if (ts >= it.second->nextResendTime && it.second->numResends < MAX_NUM_RESENDS)
+				if (ts >= it->second->nextResendTime)
 				{	
-					for (auto& f: it.second->fragments)
+					if (it->second->numResends < MAX_NUM_RESENDS)
+					{	
+						for (auto& f: it->second->fragments)
 							if (f) m_Session.Send (f->buf, f->len); // resend
 
-					it.second->numResends++;
-					it.second->nextResendTime += it.second->numResends*RESEND_INTERVAL;
+						it->second->numResends++;
+						it->second->nextResendTime += it->second->numResends*RESEND_INTERVAL;
+						it++;
+					}	
+					else
+					{
+						LogPrint (eLogError, "SSU message has not been ACKed after ", MAX_NUM_RESENDS, " attempts. Deleted");
+						delete it->second;
+						it = m_SentMessages.erase (it);
 					}	
 				}	
+				else
+					it++;
+			}
 			ScheduleResend ();	
 		}	
 	}	
+
+	void SSUData::ScheduleDecay ()
+	{		
+		m_DecayTimer.cancel ();
+		m_DecayTimer.expires_from_now (boost::posix_time::seconds(DECAY_INTERVAL));
+		auto s = m_Session.shared_from_this();
+		m_ResendTimer.async_wait ([s](const boost::system::error_code& ecode)
+			{ s->m_Data.HandleDecayTimer (ecode); });
+	}	
+
+	void SSUData::HandleDecayTimer (const boost::system::error_code& ecode)
+	{
+		if (ecode != boost::asio::error::operation_aborted)
+			m_ReceivedMessages.clear ();
+	}	
+
+	void SSUData::ScheduleIncompleteMessagesCleanup ()
+	{
+		m_IncompleteMessagesCleanupTimer.cancel ();
+		m_IncompleteMessagesCleanupTimer.expires_from_now (boost::posix_time::seconds(INCOMPLETE_MESSAGES_CLEANUP_TIMEOUT));
+		auto s = m_Session.shared_from_this();
+		m_IncompleteMessagesCleanupTimer.async_wait ([s](const boost::system::error_code& ecode)
+			{ s->m_Data.HandleIncompleteMessagesCleanupTimer (ecode); });
+	}
+		
+	void SSUData::HandleIncompleteMessagesCleanupTimer (const boost::system::error_code& ecode)
+	{
+		if (ecode != boost::asio::error::operation_aborted)
+		{
+			uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
+			for (auto it = m_IncomleteMessages.begin (); it != m_IncomleteMessages.end ();)
+			{
+				if (ts > it->second->lastFragmentInsertTime + INCOMPLETE_MESSAGES_CLEANUP_TIMEOUT)
+				{
+					LogPrint (eLogError, "SSU message ", it->first, " was not completed  in ", INCOMPLETE_MESSAGES_CLEANUP_TIMEOUT, " .Deleted");
+					delete it->second;
+					it = m_IncomleteMessages.erase (it);
+				}	
+				else
+					it++;
+			}	
+			ScheduleIncompleteMessagesCleanup ();
+		}	
+	}	
 }
 }
 

SSUData.h

@@ -26,6 +26,9 @@ namespace transport
 	const size_t SSU_V6_MAX_PACKET_SIZE = SSU_MTU_V6 - IPV6_HEADER_SIZE - UDP_HEADER_SIZE; // 1424
 	const int RESEND_INTERVAL = 3; // in seconds
 	const int MAX_NUM_RESENDS = 5;
+	const int DECAY_INTERVAL = 20; // in seconds
+	const int MAX_NUM_RECEIVED_MESSAGES = 1000; // how many msgID we store for duplicates check
+	const int INCOMPLETE_MESSAGES_CLEANUP_TIMEOUT = 30; // in seconds
 	// data flags
 	const uint8_t DATA_FLAG_EXTENDED_DATA_INCLUDED = 0x02;
 	const uint8_t DATA_FLAG_WANT_REPLY = 0x04;
@@ -58,9 +61,10 @@ namespace transport
 	{
 		I2NPMessage * msg;
 		int nextFragmentNum;	
+		uint32_t lastFragmentInsertTime; // in seconds
 		std::set<std::unique_ptr<Fragment>, FragmentCmp> savedFragments;
 		
-		IncompleteMessage (I2NPMessage * m): msg (m), nextFragmentNum (0) {};
+		IncompleteMessage (I2NPMessage * m): msg (m), nextFragmentNum (0), lastFragmentInsertTime (0) {};
 		~IncompleteMessage () { if (msg) DeleteI2NPMessage (msg); };
 	};
 
@@ -78,6 +82,8 @@ namespace transport
 
 			SSUData (SSUSession& session);
 			~SSUData ();
+
+			void Start ();
 			void Stop ();	
 			
 			void ProcessMessage (uint8_t * buf, size_t len);
@@ -96,6 +102,12 @@ namespace transport
 			void ScheduleResend ();
 			void HandleResendTimer (const boost::system::error_code& ecode);	
 
+			void ScheduleDecay ();
+			void HandleDecayTimer (const boost::system::error_code& ecode);	
+
+			void ScheduleIncompleteMessagesCleanup ();
+			void HandleIncompleteMessagesCleanupTimer (const boost::system::error_code& ecode);	
+			
 			void AdjustPacketSize (const i2p::data::RouterInfo& remoteRouter);	
 			
 		private:	
@@ -104,7 +116,7 @@ namespace transport
 			std::map<uint32_t, IncompleteMessage *> m_IncomleteMessages;
 			std::map<uint32_t, SentMessage *> m_SentMessages;
 			std::set<uint32_t> m_ReceivedMessages;
-			boost::asio::deadline_timer m_ResendTimer;
+			boost::asio::deadline_timer m_ResendTimer, m_DecayTimer, m_IncompleteMessagesCleanupTimer;
 			int m_MaxPacketSize, m_PacketSize;
 			i2p::I2NPMessagesHandler m_Handler;
 	};	

SSUSession.cpp

@@ -15,10 +15,9 @@ namespace transport
 {
 	SSUSession::SSUSession (SSUServer& server, boost::asio::ip::udp::endpoint& remoteEndpoint,
 		std::shared_ptr<const i2p::data::RouterInfo> router, bool peerTest ): TransportSession (router), 
-		m_Server (server), m_RemoteEndpoint (remoteEndpoint), 
-		m_Timer (GetService ()), m_PeerTest (peerTest),
- 		m_State (eSessionStateUnknown), m_IsSessionKey (false), m_RelayTag (0),
-		m_Data (*this), m_NumSentBytes (0), m_NumReceivedBytes (0)
+		m_Server (server), m_RemoteEndpoint (remoteEndpoint), m_Timer (GetService ()), 
+		m_PeerTest (peerTest),m_State (eSessionStateUnknown), m_IsSessionKey (false), m_RelayTag (0),
+		m_NumSentBytes (0), m_NumReceivedBytes (0), m_Data (*this)
 	{
 		m_CreationTime = i2p::util::GetSecondsSinceEpoch ();
 	}
@@ -780,6 +779,7 @@ namespace transport
 			delete m_DHKeysPair;
 			m_DHKeysPair = nullptr;
 		}
+		m_Data.Start ();
 		m_Data.Send (CreateDatabaseStoreMsg ());
 		transports.PeerConnected (shared_from_this ());
 		if (m_PeerTest && (m_RemoteRouter && m_RemoteRouter->IsPeerTesting ()))

SSUSession.h

@@ -136,9 +136,9 @@ namespace transport
 			i2p::crypto::CBCDecryption m_SessionKeyDecryption;
 			i2p::crypto::AESKey m_SessionKey;
 			i2p::crypto::MACKey m_MacKey;
-			SSUData m_Data;
 			size_t m_NumSentBytes, m_NumReceivedBytes;
 			uint32_t m_CreationTime; // seconds since epoch
+			SSUData m_Data;
 	};