Dns.h

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// Arduino 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 "RF24Ethernet.h"
 
#if UIP_CONF_UDP > 0 || RF24ETHERNET_USE_UDP > 0
 
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);
 
protected:
    uint16_t BuildRequest(const char* aName);
    uint16_t ProcessResponse(uint16_t aTimeout, IPAddress& aAddress);
 
    IPAddress iDNSServer;
    uint16_t iRequestId;
    RF24UDP iUdp;
};
 
#endif
#endif