changes to compile with core 2.0.3

lib/Ethernet/src/Dns.h

@@ -0,0 +1,40 @@
+// Arduino DNS client for WIZnet W5100-based Ethernet shield
+// (c) Copyright 2009-2010 MCQN Ltd.
+// Released under Apache License, version 2.0
+
+#ifndef DNSClient_h
+#define DNSClient_h
+
+#include "Ethernet.h"
+
+class DNSClient
+{
+public:
+	void begin(const IPAddress& aDNSServer);
+
+	/** Convert a numeric IP address string into a four-byte IP address.
+	    @param aIPAddrString IP address to convert
+	    @param aResult IPAddress structure to store the returned IP address
+	    @result 1 if aIPAddrString was successfully converted to an IP address,
+	            else error code
+	*/
+	int inet_aton(const char *aIPAddrString, IPAddress& aResult);
+
+	/** Resolve the given hostname to an IP address.
+	    @param aHostname Name to be resolved
+	    @param aResult IPAddress structure to store the returned IP address
+	    @result 1 if aIPAddrString was successfully converted to an IP address,
+	            else error code
+	*/
+	int getHostByName(const char* aHostname, IPAddress& aResult, uint16_t timeout=5000);
+
+protected:
+	uint16_t BuildRequest(const char* aName);
+	uint16_t ProcessResponse(uint16_t aTimeout, IPAddress& aAddress);
+
+	IPAddress iDNSServer;
+	uint16_t iRequestId;
+	EthernetUDP iUdp;
+};
+
+#endif