ASP和PHP限制IP访问 只允许指定IP访问 允许*号通配符过滤IP

/**
 * 检测访问的ip是否为规定的允许的ip
 * Enter description here ...
 */
function check_ip(){
    $ALLOWED_IP=array('192.168.2.*','127.0.0.1','192.168.2.49');
    $IP=getIP();
    $check_ip_arr= explode('.',$IP);//要检测的ip拆分成数组
    #限制IP
    if(!in_array($IP,$ALLOWED_IP)) {
        foreach ($ALLOWED_IP as $val){
            if(strpos($val,'*')!==false){//发现有*号替代符
                 $arr=array();//
                 $arr=explode('.', $val);
                 $bl=true;//用于记录循环检测中是否有匹配成功的
                 for($i=0;$i<4;$i++){
                     if($arr[$i]!='*'){//不等于*  就要进来检测，如果为*符号替代符就不检查
                         if($arr[$i]!=$check_ip_arr[$i]){
                             $bl=false;
                             break;//终止检查本个ip 继续检查下一个ip
                         }
                     }
                 }//end for 
                 if($bl){//如果是true则找到有一个匹配成功的就返回
                     return;
                     die;
                 }
            }
        }//end foreach
        header('HTTP/1.1 403 Forbidden');
        echo "Access forbidden";
        die;
    }
}

function getIP() {
    return isset($_SERVER["HTTP_X_FORWARDED_FOR"])?$_SERVER["HTTP_X_FORWARDED_FOR"]
    :(isset($_SERVER["HTTP_CLIENT_IP"])?$_SERVER["HTTP_CLIENT_IP"]
    :$_SERVER["REMOTE_ADDR"]);
}

 以下为ASP版:

<%
'受屏蔽IP地址(段)集合，星号为通配符，通常保存于配置文件中。
Const BadIPGroup = "192.168.1.*|202.68.*.*|*.12.55.34|185.*.96.24|127.*.0.1|192.168.0.1"
If IsForbidIP(BadIPGroup) = True Then
    Response.Write(GetIP &"IP地址禁止访问")
    Response.End()
End If

'参数vBadIP：要屏蔽的IP段,IP地址集合，用|符号分隔多个IP地址(段)
'返回Bool：True用户IP在被屏蔽范围，False 反之
Function IsForbidIP(vBadIP)
    Dim counter, arrIPPart, arrBadIP, arrBadIPPart, i, j
    arrBadIP = Split(vBadIP, "|")
    arrIPPart = Split(GetIP(), ".")
    For i = 0 To UBound(arrBadIP)
    counter = 0
    arrBadIPPart = Split(arrBadIP(i), ".")
    For j = 0 To UBound(arrIPPart)
    If(arrBadIPPart(j)) = "*" or Cstr(arrIPPart(j)) = Cstr(arrBadIPPart(j)) Then
    counter = counter + 1
    End If
    Next
    If counter = 4 Then
    IsForbidIP = True
    Exit Function
    End If
    Next
    IsForbidIP = False
End Function

''返回客户IP地址
Function GetIP()
    Dim IP
    IP = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
    If IP = "" Then IP = Request.ServerVariables("REMOTE_ADDR")
    GetIP = IP
End Function
%>