public static DnsPackage FromArray(byte[] clientMessage)
{
Console.WriteLine(clientMessage.Length);
var header = PackageHeader.FromArray(clientMessage);
Console.WriteLine("HEADER DONE");
var question = PackageQuestion.FromArray(clientMessage, 12);
Console.WriteLine("QUESTION DONE");
var answers = new List <PackageAnswer>();
var lastSize = 12 + question.Size;
for (int i = 0; i < header.ANCOUNT; i++)
{
var answer = PackageAnswer.FromArray(clientMessage, lastSize);
if (answer.Size == 6)
{
break;
}
answers.Add(answer);
lastSize += answer.Size;
}
var auths = new List <PackageAnswer>();
for (int i = 0; i < header.NSCOUNT; i++)
{
var authorityAnswer = PackageAnswer.FromArray(clientMessage, lastSize);
lastSize += authorityAnswer.Size;
authorityAnswer.SetNormalName(clientMessage);
auths.Add(authorityAnswer);
}
var additionals = new List <PackageAnswer>();
for (int i = 0; i < header.ARCOUNT; i++)
{
var additionalAnswer = PackageAnswer.FromArray(clientMessage, lastSize);
lastSize += additionalAnswer.Size;
additionalAnswer.Question.QTYPE = (int)Type.NS;
additionalAnswer.SetNormalName(clientMessage);
additionals.Add(additionalAnswer);
}
foreach (var add in additionals)
{
var q = auths.FirstOrDefault(x => ArraysEquals(x.RDATA, add.Question.QNAME));
if (q != null)
{
add.Question.QNAME = q.Question.QNAME;
}
}
Console.WriteLine("ANSWER DONE");
return(new DnsPackage(header, question, answers)
{
Additionals = additionals, Auth = auths
});
}
public static PackageHeader FromArray(byte[] clientMessage)
{
var header = new PackageHeader
{
ID = BitConverter.ToInt16(clientMessage, 0),
QR = BitConverter.ToUInt16(clientMessage, 2) >> 15,
AA = (BitConverter.ToUInt16(clientMessage, 2) << 5) >> 15,
TC = (BitConverter.ToUInt16(clientMessage, 2) << 6) >> 15,
RA = (BitConverter.ToUInt16(clientMessage, 2) << 8) >> 15,
RCODE = (BitConverter.ToUInt16(clientMessage, 2) << 12) >> 15,
QDCOUNT = BitConverter.ToInt16(clientMessage.Skip(4).Take(2).Reverse().ToArray(), 0),
ANCOUNT = BitConverter.ToInt16(clientMessage.Skip(6).Take(2).Reverse().ToArray(), 0),
NSCOUNT = BitConverter.ToInt16(clientMessage.Skip(8).Take(2).Reverse().ToArray(), 0),
ARCOUNT = BitConverter.ToInt16(clientMessage.Skip(10).Take(2).Reverse().ToArray(), 0)
};
return(header);
}
public DnsPackage(PackageHeader header, PackageQuestion question, List <PackageAnswer> answers)
{
Header = header;
Question = question;
Answers = answers;
}
