从DNS获取IP

Question

How can I create a stream of data to find the IP of a certain domain using TCP? Searching around the forum and tried something like this:

client = new UdpClient();
IPEndPoint ep = new IPEndPoint(IPAddress.Parse("8.8.8.8"), 53);
client.Connect(ep);
String query = "host -T google.com";
byte[] myByte = System.Text.ASCIIEncoding.Default.GetBytes(query);
client.Send(myByte, myByte.Length);
var receivedData = client.Receive(ref ep);

I don't understand how to create the correct message for DNS server. If something similar to the HTTP way exist, it would be great.

UPDATE: This is how you do it!

    client = new UdpClient();
    IPEndPoint ep = new IPEndPoint(IPAddress.Parse("8.8.8.8"), 53);
    client.Connect(ep);

    //dynamic dns
    String host1 = "vg.no";
    byte[] hostnameLength = new byte[1];
    byte[] hostdomainLength = new byte[1];


    byte[] tranactionID1 = { 0x46, 0x62 };
    byte[] queryType1 = { 0x01, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
    byte[] hostname = System.Text.ASCIIEncoding.Default.GetBytes(host1.Split('.')[0]);
    hostnameLength[0] = (byte)hostname.Length;
    byte[] hostdomain = System.Text.ASCIIEncoding.Default.GetBytes(host1.Split('.')[1]);
    hostdomainLength[0] = (byte)hostdomain.Length;
    byte[] queryEnd = {0x00, 0x00, 0x01, 0x00, 0x01};
    byte[] dnsQueryString = tranactionID1.Concat(queryType1).Concat(hostnameLength).Concat(hostname).Concat(hostdomainLength).Concat(hostdomain).Concat(queryEnd).ToArray();
    client.Send(dnsQueryString, dnsQueryString.Length);

Answer 1

If the question is simply "Get IP of domain from DNS in C#" the simple answer is

var res = Dns.GetHostEntry("google.com").AddressList;

This statement return a string array with IP addresses of resolved domain name.

If the question is more complex "Get IP of domain from DNS in C# using TCP/IP protocol", take a look here