using System;
using System.Net;
using System.Net.Sockets;
namespace GetNum
{
public class checkurl
{
   public checkurl()
   {
   }
   public static bool GetUrlStatus()
   {
    try
    {
     System.Web.HttpContext page=System.Web.HttpContext.Current;
     string link = page.Request.UrlReferrer.ToString();    //获取用户前一个访问的url
     link = link.Substring(7);          //去掉url前的“http://”
     int n = link.IndexOf("/");                                                            
     link = link.Substring(0, n);      //将用户前一个访问的url转化为"xxx.xxx.xxx"形式
     IPHostEntry hostEntry = Dns.Resolve(link);                       
     IPEndPoint ipEndPoint = new IPEndPoint( hostEntry.AddressList[0],0);
     string ipAddress = ipEndPoint.Address.ToString();       //将前一个访问的url转换为ip地址
     if (ipAddress == page.Request.ServerVariables.Get("Local_Addr").ToString())   //获取服务器ip，与用户前个访问的ip对比，相同则不是盗链
     {
      return true;
     }
     else
     {
      return false;   //盗链
     }
    }
    catch
    {
     return false;   //盗链
    }
   }
}
}