private SRVRecord ReadSRVRecord(ref MemoryStream DNSResponseStream)
{
SRVRecord srv = new SRVRecord();
byte[] temp = new byte[4];
DNSResponseStream.Read(temp, 0, 4);
DNSResponseStream.Read(temp, 0, 4);
//DNSResponseStream.Read(temp, 0, 2);
byte[] priority = new byte[2];
DNSResponseStream.Read(priority, 0, 2);
srv.Priority = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(priority, 0));
byte[] weight = new byte[2];
DNSResponseStream.Read(weight, 0, 2);
srv.Weight = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(weight, 0));
byte[] port = new byte[2];
DNSResponseStream.Read(port, 0, 2);
srv.Port = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(port, 0));
srv.HostName = ParseHost(ref DNSResponseStream);
if (String.IsNullOrEmpty(srv.HostName))
{
return(null);
}
return(srv);
}
private List <SRVRecord> ParseResponse(byte[] DNSResponse)
{
// Read the raw DNS response
short answers = (short)(DNSResponse[4] << 8 | DNSResponse[5]);
if (answers < 1)
{
return(null);
}
List <SRVRecord> records = new List <SRVRecord>();
// We have some answers, so read them
// First of all we need to get past the DNS header
short pointer = (short)(12 + DNSResponse[12] + 1);
while (DNSResponse[pointer] != 0)
{
pointer += (short)(DNSResponse[pointer] + 1);
}
pointer += 6;
MemoryStream ms = new MemoryStream(DNSResponse, 0, DNSResponse.Length);
ms.Position = pointer;
while (ms.Position < ms.Length)
{
SRVRecord record = ReadSRVRecord(ref ms);
if (record != null)
{
records.Add(record);
}
}
ms.Close();
return(records);
}
