php判断ip黑名单程序代码实例

学校的新闻系统要求有些新闻只开放校内ip浏览，于是重写了一个代码来实现此功能，实现后的结果是，只要把允许访问的ip列入ip.txt这个文件中即可，同时支持c类ip，例如：

ip.txt
192.168
211.67.188
211.67.191.25
代码如下：

/*
* ip地址黑名单、白名单
* 判断访客地址的ip是否在ip.txt中，支持c类ip
* by xhat
*/

$ip = $_server['remote_addr'];
$iparray = preg_replace("#rn?|n#","",file('ip.txt'));
foreach ($iparray as $iptest) {
if (substr_count($ip, $iptest) != "0") {
echo "ok"; //执行相关命令
die();
}
}

?>

上面大家可以使用代码来骗过了，下面代码进行升级

<?php
class block_ip {
var $block_ip = array("192.168.1.1","210.10.2.1-20","222.34.4.*");
function __construct(){
}
function __destruct(){
}
private function makepregip($str){
if (strstr($str,"-")) {
$aip = explode(".",$str);
foreach ($aip as $k=>$v) {
if (!strstr($v,"-")) {
$preg_limit .= makepregip($v);
} else{
$aipnum = explode("-",$v);
for($i=$aipnum[0];$i<=$aipnum[1];$i++){
$preg .=$preg?"|".$i:"[".$i;
}
$preg_limit .=strrpos($preg_limit,".",1)==(strlen($preg_limit)-1)?$preg."]":".".$preg."]";
}
}
}else{
$preg_limit .= $str.".";
}
return $preg_limit;
}
private function getallblockip(){
if ($this->block_ip) {
foreach ($this->block_ip as $k=>$v) {
$ipaddres = $this->makepregip($v->start_ip);
$ip = str_ireplace(".",".",$ipaddres);
$ip = str_replace("*","[0-9]{1,3}",$ip);
$ipaddres = "/".$ip."/";
$ip_list[] = $ipaddres;
}
}
return $ip_list;
}
public function checkip() {
$iptable = $this->getallblockip();
$isjoined = true;
//取得用户ip
$ip = $this->get_client_ip();
$ip = trim($ip);
//剔除黑名单中的ip区段
if ($iptable) {
foreach($iptable as $value) {
if (preg_match("{$value}",$ip)) {
$isjoined = false;
break;
}
}
}
// 如果在ip黑名单中就执行如下操作
if( !$isjoined ){
echo "ip error";
exit;
}
}
private function get_client_ip(){
if (getenv("http_client_ip") && strcasecmp(getenv("http_client_ip"), "unknown"))
$ip = getenv("http_client_ip");
else if (getenv("http_x_forwarded_for") && strcasecmp(getenv("http_x_forwarded_for"), "unknown"))
$ip = getenv("http_x_forwarded_for");
else if (getenv("remote_addr") && strcasecmp(getenv("remote_addr"), "unknown"))
$ip = getenv("remote_addr");
else if (isset($_server['remote_addr']) && $_server['remote_addr'] && strcasecmp($_server['remote_addr'], "unknown"))
$ip = $_server['remote_addr'];
else
$ip = "unknown";
return($ip);
}
}
?>

引用片段：

$oblock_ip = new block_ip();
$oblock_ip->checkip();