Dns.h

00001 // Arduino DNS client for Enc28J60-based Ethernet shield
00002 // (c) Copyright 2009-2010 MCQN Ltd.
00003 // Released under Apache License, version 2.0
00004 
00005 #ifndef DNSClient_h
00006 #define DNSClient_h
00007 
00008 #include "utility/uipopt.h"
00009 #if UIP_UDP
00010 #include "UIPUdp.h"
00011 
00012 class DNSClient
00013 {
00014 public:
00015     // ctor
00016     void begin(const IPAddress& aDNSServer);
00017 
00018     /** Convert a numeric IP address string into a four-byte IP address.
00019         @param aIPAddrString IP address to convert
00020         @param aResult IPAddress structure to store the returned IP address
00021         @result 1 if aIPAddrString was successfully converted to an IP address,
00022                 else error code
00023     */
00024     int inet_aton(const char *aIPAddrString, IPAddress& aResult);
00025 
00026     /** Resolve the given hostname to an IP address.
00027         @param aHostname Name to be resolved
00028         @param aResult IPAddress structure to store the returned IP address
00029         @result 1 if aIPAddrString was successfully converted to an IP address,
00030                 else error code
00031     */
00032     int getHostByName(const char* aHostname, IPAddress& aResult);
00033 
00034 protected:
00035     uint16_t BuildRequest(const char* aName);
00036     int16_t ProcessResponse(uint16_t aTimeout, IPAddress& aAddress);
00037 
00038     IPAddress iDNSServer;
00039     uint16_t iRequestId;
00040     UIPUDP iUdp;
00041 };
00042 #endif
00043 
00044 #endif