protected DnsPacket (byte [] buffer, int length)
{
if (buffer == null)
throw new ArgumentNullException("buffer");
if (length <= 0)
throw new ArgumentOutOfRangeException("length", "Must be greater than zero.");
packet = buffer;
position = length;
header = new DnsHeader(new ArraySegment<byte>(packet, 0, 12));
}
public DnsQuery (string name, DnsQType qtype, DnsQClass qclass)
{
if (String.IsNullOrEmpty (name))
throw new ArgumentNullException ("name");
int length = DnsUtil.GetEncodedLength (name);
if (length == -1)
throw new ArgumentException ("Invalid DNS name", "name");
length += 12 + 2 + 2; // Header + qtype + qclass
packet = new byte [length];
header = new DnsHeader (packet, 0);
position = 12;
WriteDnsName (name);
WriteUInt16 ((ushort) qtype);
WriteUInt16 ((ushort) qclass);
Header.QuestionCount = 1;
Header.IsQuery = true;
Header.RecursionDesired = true;
}