PowerShell Whois Module

WhoisCommand.cs

// Author: Oğuzhan YILMAZ
// Web   : www.oguzhan.info
// Email : aspsrc@gmail.com
// 12/13/2011

namespace PoshWhois
{
    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Linq;
    using System.Management.Automation;
    using System.Net.Sockets;
    using System.Text;

    [Cmdlet(VerbsCommon.Get, "Whois")]
    public class WhoisCommand : Cmdlet
    {
        [Parameter(Position=0, Mandatory= true)]
        public string domain { get; set; }

        protected override void ProcessRecord()
        {
            if (String.IsNullOrEmpty(domain))
            {
                WriteObject("Domain name required");
                return;
            }
            
            var _whoisInfo = GetWhois(domain);
            WriteObject(_whoisInfo);            
        }

        // http://dotnet-snippets.com/dns/gets-the-whois-information-SID581.aspx
        private string GetWhois(string _name)
        {
            var _host = WhoisHost(_name);

            try
            {
                StringBuilder stringBuilderResult = new StringBuilder();
                TcpClient tcpClinetWhois = new TcpClient(_host, 43);
                NetworkStream networkStreamWhois = tcpClinetWhois.GetStream();
                BufferedStream bufferedStreamWhois = new BufferedStream(networkStreamWhois);
                StreamWriter streamWriter = new StreamWriter(bufferedStreamWhois);

                streamWriter.WriteLine(_name);
                streamWriter.Flush();

                StreamReader streamReaderReceive = new StreamReader(bufferedStreamWhois);

                while (!streamReaderReceive.EndOfStream)
                    stringBuilderResult.AppendLine(streamReaderReceive.ReadLine());

                return stringBuilderResult.ToString();
            }
            catch (Exception ex)
            {
                return String.Format("Error: {0}", ex.Message);
            }
        }

        private string WhoisHost(string _name)
        {
            _name = _name ?? String.Empty;
            var _extension =  _name.Split('.').Last().ToUpper();

            var _list = new Dictionary<string, string>();
            _list.Add("COM", "whois.internic.net");
            _list.Add("NET", "whois.internic.net");
            _list.Add("ORG", "whois.publicinterestregistry.net");
            _list.Add("INFO", "whois.afilias.info");

            return _list.ContainsKey(_extension) ? 
                                                _list[_extension] : 
                                                _list.First().Value;
        }
    }


    
}