private static byte[] GetResponseBytes(DnsQueryResponse message, byte[] answerData)
{
using (var writer = new DnsDatagramWriter())
{
writer.WriteUInt16NetworkOrder((ushort)message.Header.Id);
writer.WriteUInt16NetworkOrder((ushort)message.Header.HeaderFlags);
// lets iterate answers only, makse it easier
//writer.WriteUInt16Network((ushort)message.Header.QuestionCount);
writer.WriteUInt16NetworkOrder(0);
writer.WriteUInt16NetworkOrder(1);
//writer.WriteUInt16Network((ushort)message.Header.NameServerCount);
writer.WriteUInt16NetworkOrder(0);
//writer.WriteUInt16Network((ushort)message.Header.AdditionalCount);
writer.WriteUInt16NetworkOrder(0);
var answer = message.Answers.First();
writer.WriteHostName(answer.DomainName.Value);
writer.WriteUInt16NetworkOrder((ushort)answer.RecordType);
writer.WriteUInt16NetworkOrder((ushort)answer.RecordClass);
writer.WriteUInt32NetworkOrder((uint)answer.TimeToLive);
writer.WriteUInt16NetworkOrder((ushort)answerData.Length);
//writer.Extend(answerData.Length); // the following data->length
writer.WriteBytes(answerData, answerData.Length);
return(writer.Data.ToArray());
}
}