SSU2: check if socket is opened before sending data, handle network_reset error

Signed-off-by: r4sas <r4sas@i2pmail.org>

libi2pd/Profiling.cpp

@@ -30,7 +30,7 @@ namespace data
 	{
 		return boost::posix_time::second_clock::local_time();
 	}
-	
+
 	RouterProfile::RouterProfile ():
 		m_LastUpdateTime (GetTime ()), m_IsUpdated (false),
 		m_LastDeclineTime (0), m_LastUnreachableTime (0),
@@ -175,8 +175,8 @@ namespace data
 	{
 		m_HasConnected = true;
 		UpdateTime ();
-	}	
-		
+	}
+
 	bool RouterProfile::IsLowPartcipationRate () const
 	{
 		return 4*m_NumTunnelsAgreed < m_NumTunnelsDeclined; // < 20% rate
@@ -223,7 +223,7 @@ namespace data
 			m_LastUnreachableTime = 0;
 		return (bool)m_LastUnreachableTime;
 	}
-	
+
 	bool RouterProfile::IsUseful() const {
 	    return
 	        m_NumTunnelsAgreed >= PEER_PROFILE_USEFUL_THRESHOLD ||
@@ -240,7 +240,7 @@ namespace data
 			auto it = g_Profiles.find (identHash);
 			if (it != g_Profiles.end ())
 				return it->second;
-		}	
+		}
 		auto profile = std::make_shared<RouterProfile> ();
 		profile->Load (identHash); // if possible
 		std::unique_lock<std::mutex> l(g_ProfilesMutex);
@@ -261,7 +261,7 @@ namespace data
 		{
 			std::unique_lock<std::mutex> l(g_ProfilesMutex);
 			for (auto it = g_Profiles.begin (); it != g_Profiles.end ();)
-			{	
+			{
 				if ((ts - it->second->GetLastUpdateTime ()).total_seconds () > PEER_PROFILE_PERSIST_INTERVAL)
 				{
 					if (it->second->IsUpdated ())
@@ -270,11 +270,11 @@ namespace data
 				}
 				else
 					it++;
-			}     
+			}
 		}
 		for (auto& it: tmp)
 			if (it.second) it.second->Save (it.first);
-	}	
+	}
 
 	void SaveProfiles ()
 	{
@@ -288,22 +288,22 @@ namespace data
 		for (auto& it: tmp)
 			if (it.second->IsUseful() && it.second->IsUpdated () && (ts - it.second->GetLastUpdateTime ()).total_seconds () < PEER_PROFILE_EXPIRATION_TIMEOUT*3600)
 				it.second->Save (it.first);
-	}	
-		
+	}
+
 	void DeleteObsoleteProfiles ()
 	{
 		{
 			auto ts = GetTime ();
 			std::unique_lock<std::mutex> l(g_ProfilesMutex);
 			for (auto it = g_Profiles.begin (); it != g_Profiles.end ();)
-			{	
+			{
 				if ((ts - it->second->GetLastUpdateTime ()).total_seconds () >= PEER_PROFILE_EXPIRATION_TIMEOUT*3600)
 					it = g_Profiles.erase (it);
 				else
 					it++;
 			}
 		}
-		
+
 		struct stat st;
 		std::time_t now = std::time(nullptr);
 

libi2pd/SSU2.cpp

@@ -78,6 +78,7 @@ namespace transport
 						if (address->IsV4 ())
 						{
 							found = true;
+							LogPrint (eLogDebug, "SSU2: Opening IPv4 socket at Start");
 							OpenSocket (boost::asio::ip::udp::endpoint (m_AddressV4, port));
 							m_ReceiveService.GetService ().post(
 								[this]()
@@ -89,6 +90,7 @@ namespace transport
 						if (address->IsV6 ())
 						{
 							found = true;
+							LogPrint (eLogDebug, "SSU2: Opening IPv6 socket at Start");
 							OpenSocket (boost::asio::ip::udp::endpoint (m_AddressV6, port));
 							m_ReceiveService.GetService ().post(
 							[this]()
@@ -243,10 +245,12 @@ namespace transport
 		if (!ecode
 			|| ecode == boost::asio::error::connection_refused
 			|| ecode == boost::asio::error::connection_reset
+			|| ecode == boost::asio::error::network_reset
 			|| ecode == boost::asio::error::network_unreachable
 			|| ecode == boost::asio::error::host_unreachable
 #ifdef _WIN32 // windows can throw WinAPI error, which is not handled by ASIO
 			|| ecode.value() == boost::winapi::ERROR_CONNECTION_REFUSED_
+			|| ecode.value() == boost::winapi::WSAENETRESET_ // 10052
 			|| ecode.value() == boost::winapi::ERROR_NETWORK_UNREACHABLE_
 			|| ecode.value() == boost::winapi::ERROR_HOST_UNREACHABLE_
 #endif
@@ -303,7 +307,7 @@ namespace transport
 				else
 				{
 					auto ep = socket.local_endpoint ();
-					socket.close ();
+					LogPrint (eLogCritical, "SSU2: Reopening socket in HandleReceivedFrom: code ", ecode.value(), ": ", ecode.message ());
 					OpenSocket (ep);
 					Receive (socket);
 				}
@@ -558,16 +562,25 @@ namespace transport
 			SendThroughProxy (header, headerLen, nullptr, 0, payload, payloadLen, to);
 			return;
 		}
+
 		std::vector<boost::asio::const_buffer> bufs
 		{
 			boost::asio::buffer (header, headerLen),
 			boost::asio::buffer (payload, payloadLen)
 		};
+
 		boost::system::error_code ec;
 		if (to.address ().is_v6 ())
+		{
+			if (!m_SocketV6.is_open ()) return;
 			m_SocketV6.send_to (bufs, to, 0, ec);
+		}
 		else
+		{
+			if (!m_SocketV4.is_open ()) return;
 			m_SocketV4.send_to (bufs, to, 0, ec);
+		}
+
 		if (!ec)
 			i2p::transport::transports.UpdateSentBytes (headerLen + payloadLen);
 		else
@@ -582,17 +595,25 @@ namespace transport
 			SendThroughProxy (header, headerLen, headerX, headerXLen, payload, payloadLen, to);
 			return;
 		}
+
 		std::vector<boost::asio::const_buffer> bufs
 		{
 			boost::asio::buffer (header, headerLen),
 			boost::asio::buffer (headerX, headerXLen),
 			boost::asio::buffer (payload, payloadLen)
 		};
+
 		boost::system::error_code ec;
 		if (to.address ().is_v6 ())
+		{
+			if (!m_SocketV6.is_open ()) return;
 			m_SocketV6.send_to (bufs, to, 0, ec);
+		}
 		else
+		{
+			if (!m_SocketV4.is_open ()) return;
 			m_SocketV4.send_to (bufs, to, 0, ec);
+		}
 
 		if (!ec)
 			i2p::transport::transports.UpdateSentBytes (headerLen + headerXLen + payloadLen);