public string Lookup(string query, string queryType, HeaderFlags queryOptions = HeaderFlags.RecursionDesired)
{
UdpClient udpChannel = null;
try
{
udpChannel = new UdpClient(LOCAL_PORT);
Message dnsRequest = new Message(queryOptions);
dnsRequest.AddQuery(query, (RecordType) Enum.Parse(typeof (RecordType), queryType, true));
byte[] requestDatagram = dnsRequest.AsByteArray();
int sendResult = udpChannel.Send(requestDatagram, requestDatagram.Length, _serverEndpoint);
// Verify sendResult and throw exception if required..
byte[] responseDatagram = udpChannel.Receive(ref _serverEndpoint);
Message dnsResponse = new Message(responseDatagram);
Debug.Assert(dnsResponse.IsForRequest(dnsRequest));
// Could make it an [if(isForRequest) ... else retry/throw] if required..
return dnsResponse.AsString();
}
finally
{
if(udpChannel != null)
udpChannel.Close();
}
}
internal bool IsForRequest(Message dnsRequest)
{
return _header.Id == dnsRequest._header.Id;
}
