use addresses in server tunnel configuration

I2PTunnel.cpp

@@ -272,9 +272,21 @@ namespace client
 	
 	void I2PServerTunnel::Start ()
 	{
-		m_Endpoint.address (boost::asio::ip::address::from_string (m_Address));
-		m_Endpoint.port (m_Port);
-		Accept ();
+		m_Endpoint.port (m_Port);	
+		boost::system::error_code ec;
+		auto addr = boost::asio::ip::address::from_string (m_Address, ec);
+		if (!ec)	
+		{
+			m_Endpoint.address (addr);
+			Accept ();
+		}
+		else
+		{
+			auto resolver = std::make_shared<boost::asio::ip::tcp::resolver>(GetService ());
+			resolver->async_resolve (boost::asio::ip::tcp::resolver::query (m_Address, ""), 
+				std::bind (&I2PServerTunnel::HandleResolve, this, 
+					std::placeholders::_1, std::placeholders::_2, resolver));
+		}	
 	}
 
 	void I2PServerTunnel::Stop ()
@@ -282,6 +294,20 @@ namespace client
 		ClearHandlers ();
 	}	
 
+	void I2PServerTunnel::HandleResolve (const boost::system::error_code& ecode, boost::asio::ip::tcp::resolver::iterator it, 
+		std::shared_ptr<boost::asio::ip::tcp::resolver> resolver)
+	{	
+		if (!ecode)
+		{	
+			auto addr = (*it).endpoint ().address ();
+			LogPrint (eLogInfo, "server tunnel ", (*it).host_name (), " has been resolved to ", addr);	
+			m_Endpoint.address (addr);
+			Accept ();	
+		}	
+		else
+			LogPrint (eLogError, "Unable to resolve server tunnel address: ", ecode.message ());
+	}
+
 	void I2PServerTunnel::SetAccessList (const std::set<i2p::data::IdentHash>& accessList)
 	{
 		m_AccessList = accessList;

I2PTunnel.h

@@ -108,6 +108,9 @@ namespace client
 
 		private:
 
+			void HandleResolve (const boost::system::error_code& ecode, boost::asio::ip::tcp::resolver::iterator it, 
+				std::shared_ptr<boost::asio::ip::tcp::resolver> resolver);
+
 			void Accept ();
 			void HandleAccept (std::shared_ptr<i2p::stream::Stream> stream);
 			virtual void CreateI2PConnection (std::shared_ptr<i2p::stream::Stream> stream);