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// Arduino DNS client for WizNet5100-based Ethernet shield
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// (c) Copyright 2009-2010 MCQN Ltd.
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// Released under Apache License, version 2.0
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#ifndef DNSClient_h
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#define DNSClient_h
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#include <EthernetUdp.h>
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class DNSClient
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{
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public:
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    // ctor
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    void begin(const IPAddress& aDNSServer);
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    /** Convert a numeric IP address string into a four-byte IP address.
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        @param aIPAddrString IP address to convert
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        @param aResult IPAddress structure to store the returned IP address
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        @result 1 if aIPAddrString was successfully converted to an IP address,
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                else error code
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    */
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    int inet_aton(const char *aIPAddrString, IPAddress& aResult);
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    /** Resolve the given hostname to an IP address.
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        @param aHostname Name to be resolved
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        @param aResult IPAddress structure to store the returned IP address
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        @result 1 if aIPAddrString was successfully converted to an IP address,
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                else error code
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    */
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    int getHostByName(const char* aHostname, IPAddress& aResult);
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protected:
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    uint16_t BuildRequest(const char* aName);
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    uint16_t ProcessResponse(uint16_t aTimeout, IPAddress& aAddress);
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    IPAddress iDNSServer;
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    uint16_t iRequestId;
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    EthernetUDP iUdp;
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};
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#endif