1 files changed, 41 insertions, 0 deletions
diff --git a/libraries/Ethernet/Dns.h b/libraries/Ethernet/Dns.h
new file mode 100644
index 0000000..6bcb98a
--- /dev/null
+++ b/libraries/Ethernet/Dns.h
@@ -0,0 +1,41 @@
+// Arduino DNS client for WizNet5100-based Ethernet shield
+// (c) Copyright 2009-2010 MCQN Ltd.
+// Released under Apache License, version 2.0
+
+#ifndef DNSClient_h
+#define DNSClient_h
+
+#include <EthernetUdp.h>
+
+class DNSClient
+{
+public:
+    // ctor
+    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);
+
+protected:
+    uint16_t BuildRequest(const char* aName);
+    uint16_t ProcessResponse(uint16_t aTimeout, IPAddress& aAddress);
+
+    IPAddress iDNSServer;
+    uint16_t iRequestId;
+    EthernetUDP iUdp;
+};
+
+#endif