Oleg Orlov / DHCP request discovering

using System;
using System.IO;
using System.Threading;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Runtime.Serialization.Formatters.Binary;


class Program
{
    static byte[] ToByteArray(object source)
    {
        var formatter = new BinaryFormatter();

        using (var stream = new MemoryStream())
        {
            formatter.Serialize(stream, source);
            return stream.ToArray();
        };
    }

    [Serializable]
    public class packageDHCP
    {
        byte op;
        byte htype;
        byte hlen;
        byte hops;
        int xid;
        Int16 secs;
        Int16 flags;
        int ciaddr;
        int yiaddr;
        int siaddr;
        int giaddr;
        byte[] chaddr;
        byte[] sname;
        byte[] file;
        byte[] options;

        enum Boot
        {
            Request = 1,
            Reply = 2,
        };

        public packageDHCP()
        {
            chaddr = new byte[0x10];
            sname = new byte[0x40];
            file = new byte[0x80];
            options = new byte[0x240];

            op = (byte)Boot.Request;
            htype = 1;
            hlen = 6;
            hops = 0;
            xid = 0x3903F326;
            secs = 0;
            flags = 0;
            ciaddr = 0;
            yiaddr = 0;
            siaddr = 0;
            giaddr = 0;
            SetCHADDR(); //0xf4-6d-04-73-a9-72
            SetSNAME();
            SetFILE();

            SetOptions();
        }

        private void SetCHADDR()
        {
            chaddr[0] = 0x72;
            chaddr[1] = 0xa9;
            chaddr[2] = 0x73;
            chaddr[3] = 4;
            chaddr[4] = 0x6d;
            chaddr[5] = 0xf4;

            for (int i = 6; i < chaddr.Length; i++)
            {
                chaddr[i] = 0;
            };
        }
        private void SetSNAME()
        {
            for (int i = 0; i < sname.Length; i++)
            {
                sname[i] = (byte)i;
            };
        }
        private void SetFILE()
        {
            for (int i = 0; i < file.Length; i++)
            {
                file[i] = (byte)i;
            };
        }

        private void SetOptions()
        {
            //99, 130, 83, 99
            options[0] = 0x63;
            options[1] = 0x82;
            options[2] = 0x53;
            options[3] = 0x99;

            for (int i = 4; i < options.Length; i++)
            {
                options[i] = 0;
            };
        }
    };

    static byte[] data;

    static void HandleDNS()
    {
        Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Udp);
        s.Connect("0xff.0xff.0xff.0xff", 67);

        packageDHCP p = new packageDHCP();
        data = ToByteArray(p);

        s.Send(data);

        Thread.Sleep(1000);
        s.Receive(data);
        Console.WriteLine(Encoding.UTF8.GetString(data));
    }

    static void Main()
    {
        HandleDNS();
    }
};