File content as of revision 0:5350a66d5279:

// mbed DNS client for Enc28J60-based Ethernet shield
// (c) Copyright 2009-2010 MCQN Ltd.
// Released under Apache License, version 2.0
#ifndef DNSClient_h
    #define DNSClient_h

    #include <UIPUdp.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;
    UIPUDP      iUdp;
};
#endif