clean up incomplete messages

TunnelEndpoint.cpp

@@ -116,6 +116,7 @@ namespace tunnel
 						if (!isFollowOnFragment) // create new incomlete message
 						{
 							m.nextFragmentNum = 1;
+							m.receiveTime = i2p::util::GetMillisecondsSinceEpoch ();
 							auto ret = m_IncompleteMessages.insert (std::pair<uint32_t, TunnelMessageBlockEx>(msgID, m));
 							if (ret.second)
 								HandleOutOfSequenceFragments (msgID, ret.first->second);
@@ -284,6 +285,14 @@ namespace tunnel
 			else
 				++it;
 		}
+		// incomplete messages
+		for (auto it = m_IncompleteMessages.begin (); it != m_IncompleteMessages.end ();)
+		{
+			if (ts > it->second.receiveTime + i2p::I2NP_MESSAGE_EXPIRATION_TIMEOUT)
+				it = m_IncompleteMessages.erase (it);
+			else
+				++it;
+		}
 	}	
 }		
 }

TunnelEndpoint.h

@@ -15,6 +15,7 @@ namespace tunnel
 	{	
 		struct TunnelMessageBlockEx: public TunnelMessageBlock
 		{
+			uint64_t receiveTime; // milliseconds since epoch
 			uint8_t nextFragmentNum;
 		};