private byte[] dataGram(string domainName,SendBy sendBy)
{
string[] dName = domainName.Split('.');
uint dgLength = (uint)sendBy * 2;
uint bodyLength;
dGramHeader dHead = new dGramHeader();
dHead.ID = 0;
dHead.QR = 0;
dHead.OpCode = OpCodes.QUERY;
dHead.AA = 0;
dHead.TC = 0;
dHead.RD = 1;
dHead.RA = 0;
dHead.Z = 0;
dHead.RCode = RCodes.Success;
dHead.QDCount = 1;
dHead.ANCount = 0;
dHead.NSCount = 0;
dHead.ARCount = 0;
byte[] header = formHeader(dHead);
byte[] question = formQuestion(dName);
bodyLength = (uint)(header.Length + question.Length);
byte[] dGram = new byte[dgLength + bodyLength];
int ptr = 0;
if (sendBy == SendBy.TCP)
{
dGram[0] = (byte)((bodyLength >> 8) & 0xFF);
dGram[1] = (byte)(bodyLength & 0xFF);
ptr = 2;
}
for (int n = 0; n < header.Length; n++)
{
dGram[ptr] = header[n];
ptr += 1;
}
for (int m = 0; m < question.Length; m++)
{
dGram[ptr] = question[m];
ptr += 1;
}
return dGram;
}
private int getResults(Byte[] receiveBytes, SendBy sendBy)
{
int ptr = ((int)sendBy * 2);
int response = (int)receiveBytes[ptr + 2] & 0x80;
int authoritativeAnswer = (int)receiveBytes[ptr + 2] & 0x04;
int truncation = (int)receiveBytes[ptr + 2] & 0x02;
int rcode = (int)receiveBytes[ptr + 3] & 0x0f;
int exists = ((int)receiveBytes[ptr + 6] << 8) + (int)receiveBytes[ptr + 7];
int result;
if (response == 0)
{
result = -8;
}
else if (rcode == 1)
{
result = -1;
}
else if (rcode == 2)
{
result = -2;
}
else if (rcode == 3)
{
result = -3;
}
else if (rcode == 5)
{
result = -5;
}
else
{
result = exists;
}
return result;
}
/// <summary>
/// Searches for TLD.
/// </summary>
/// <param name="domainName"></param>
/// <param name="sendBy">UDP or TCP</param>
public Lookup(string domainName, SendBy sendBy)
{
this.domainName = domainName;
this.sendBy = sendBy;
send();
}
