ARP-Scanner/ARP-Scanner/ArpUtilities.cs

using Stone_Red_Utilities.ConsoleExtentions;

using System.Net;
using System.Runtime.InteropServices;

namespace ARP_Scanner;

internal class ArpUtilities
{
    [DllImport("iphlpapi.dll", ExactSpelling = true)]
    private static extern int SendARP(int DestIP, int SrcIP, byte[] pMacAddr, ref uint PhyAddrLen);

    private uint macAddrLen = (uint)new byte[6].Length;

    public string? SendArpRequest(IPAddress ipAddress)
    {
        byte[] macAddr = new byte[6];

        try
        {
            _ = SendARP(BitConverter.ToInt32(ipAddress.GetAddressBytes(), 0), 0, macAddr, ref macAddrLen);
            if (MacAddresstoString(macAddr) != "00-00-00-00-00-00")
            {
                return MacAddresstoString(macAddr);
            }
        }
        catch (Exception e)
        {
            ConsoleExt.WriteLine(e.Message, ConsoleColor.Red);
        }
        return null;
    }

    public static string MacAddresstoString(byte[] macAdrr)
    {
        string macString = BitConverter.ToString(macAdrr);
        return macString.ToUpper();
    }
}