using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;

namespace sharpknife
{
    class SocketClient
    {
        protected Socket GetSocket()
        {
            Socket tc = null;
            IPHostEntry hostEntry = null;
            hostEntry = this.GetHostEntry("gmail.com");
            if (hostEntry != null)
            {
                foreach (IPAddress address in hostEntry.AddressList)
                {
                    tc = this.TryGetSocket(address, 993);
                    if (tc != null) { break; }
                }
            }
            return tc;
        }

        private Socket TryGetSocket(IPAddress address, int port)
        {
            IPEndPoint ipe = new IPEndPoint(address, port);
            Socket tc = null;

            try
            {
                tc = new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
                tc.Connect(ipe);
                if (tc.Connected == true)
                {
                    tc.ReceiveTimeout = 3600;
                    tc.SendBufferSize = 18000;
                    tc.ReceiveBufferSize = 18000;
                }
            }
            catch
            {
                tc = null;
            }
            return tc;
        }
        private IPHostEntry GetHostEntry(string serverName)
        {
            try
            {
                return Dns.GetHostEntry(serverName);
            }
            catch { }
            return null;
        }
    }
}