using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace SharpDNSResolver
{
    class DNSResolver
    {
        static void Main(string[] args)
        {
            if (args.Count() == 0)
            {
                Console.WriteLine("You must provide at least one host!");
                Console.WriteLine("Usage: <prog.exe> <host1> [<host2> host<n>]");
                Environment.Exit(1);
            }

            int cpt = 0;
            string hostname;
            IPHostEntry hostEntry;
            for (cpt = 0; cpt < args.Length; cpt++)
            {
                try
                {
                    hostname = args[cpt];
                    hostEntry = Dns.GetHostEntry(hostname);
                    Console.WriteLine($"\nHost : {hostEntry.HostName}");
                    Console.WriteLine("Ip address:");
                    foreach (IPAddress ipAddress in hostEntry.AddressList)
                    {
                        Console.WriteLine($"  {ipAddress}");
                    }
                }
                catch (System.Net.Sockets.SocketException ex)
                {
                    Console.WriteLine($"Error : {ex.Message}");
                }
            }
        }
    }
}