public DNSFrame(byte[] frameToByteArray)
{
if (!BitConverter.IsLittleEndian)
{
frameToByteArray = frameToByteArray.Reverse().ToArray();
}
FrameAsByte = frameToByteArray;
Header = new Header(frameToByteArray.Take(sizeHead).ToArray());
Questions = new ResourceRecords(frameToByteArray.Skip(sizeHead).ToArray(), Header.QDCOUNT,
true);
framePointer = Questions.Pos + sizeHead - 1;
if (Header.ANCOUNT > 0)
{
Answers = new ExtensionResourceRecords(frameToByteArray, framePointer, Header.ANCOUNT);
framePointer = Answers.Pointer;
}
if (Header.NSCOUNT > 0)
{
AuthorityRecords = new ExtensionResourceRecords(frameToByteArray, framePointer, Header.NSCOUNT);
framePointer = AuthorityRecords.Pointer;
}
if (Header.ARCOUNT > 0)
{
AdditionalRecords = new ExtensionResourceRecords(frameToByteArray, framePointer, Header.ARCOUNT);
}
}
private static IEnumerable <byte> RecordToBytes(ExtensionResourceRecords records)
{
var byteSequence = new List <byte>();
foreach (var record in records.Records)
{
byteSequence.AddRange(ReverseBytes(record.DomainNamePointer));
byteSequence.AddRange(ReverseBytes(BitConverter.GetBytes(record.QType)));
byteSequence.AddRange(BitConverter.GetBytes(record.QClass));
byteSequence.AddRange(ReverseBytes(BitConverter.GetBytes(record.Ttl), 4));
byteSequence.AddRange(ReverseBytes(BitConverter.GetBytes(record.RdLength)));
byteSequence.AddRange(record.RData);
}
return(byteSequence);
}