C# IP地址访问控制

来源：互联网发布：俞兆林男士内裤知乎编辑：程序博客网时间：2024/04/30 05:52

            string ipLimit = "192.168.152.x,192.168.153.x,192.168.154.x,192.168.155.x,192.168.156.x,192.168.157.x,192.168.158.x,192.168.159.x,192.168.x.x";            string[] arrSeperators = { "," };            string[] ipList = ipLimit.Split(arrSeperators, StringSplitOptions.RemoveEmptyEntries);            if (!CheckIPLimit(ipList, GetRemoteIP()))            {                   return“不可以访问”;            }

获得请求的IP地址函数GetRemoteIP()：

        private string GetRemoteIP()        {            string ip = "";            if (Context.Request.ServerVariables["HTTP_VIA"] != null) // 服务器， using proxy            {                //得到真实的客户端地址                ip = Context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString(); // Return real client IP.            }            else//如果没有使用代理服务器或者得不到客户端的ip not using proxy or can't get the Client IP            {                // 得到服务端的地址                ip = Context.Request.ServerVariables["REMOTE_ADDR"].ToString(); //While it can't get the Client IP, it will return proxy IP.            }            return ip;        }    }

下面的函数将 string[] ipList与请求IP一一比较（分段比较）：

   private bool CheckIPLimit(string[] ipList, string remoteIP)        {            foreach (string ip in ipList)            {                if (CompareIP(ip, remoteIP))                {                    return true;                }            }            return false;        }        private bool CompareIP(string oldIP, string newIP)        {            string[] arrSeperators = { "." };            string[] oldIPList = oldIP.Split(arrSeperators, StringSplitOptions.RemoveEmptyEntries);            string[] newIPList = newIP.Split(arrSeperators, StringSplitOptions.RemoveEmptyEntries);            if (oldIPList.Length != newIPList.Length)            {                return false;            }            for (int i = 0; i < oldIPList.Length; i++)            {                if (oldIPList[i] != checkedIP & oldIPList[i] != newIPList[i])//截取的ip是‘x’则是true                {                    return false;                }            }            return true;        }