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using System;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
namespace TCPproxy
{
abstract class HostUtils
{
public static IPAddress ResendHostToIp(string host)
{
IPAddress ip;
if(host == "")
{
throw new Exception("Please enter the resend host");
}
Regex ipRegex = new Regex(@"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$");
if(ipRegex.Match(host).Success)
{
try
{
ip = IPAddress.Parse(host);
}
catch(FormatException)
{
throw new Exception("Wrong IP address of the resend host");
}
}
else
{
IPHostEntry hostInfo = Dns.GetHostEntry(host);
if(hostInfo.AddressList.Length > 0)
{
ip = hostInfo.AddressList[0];
}
else
{
throw new Exception("Cannot find IP address of the resend host");
}
}
return ip;
}
}
}