PHP实现IP黑白名单过滤
需求来自一个运维的同事,对一个php文件执行进行IP过滤,不方便直接配置服务器,于是需要直接在php文件开头进行IP的过滤。
IP过滤规则,可以有如下形式:
1.完整的IP地址 如:192.168.0.1
2.某一段IP 如:192.168.0.* 。
运维可以自定义IP黑白名单,由多个IP过滤规则组成,保存在数组中。通过编写代码,实现IP黑白名单功能。一个比较简单的需求。
首先实现一个函数,功能是判断ip是否符合某个ip过滤规则:
function ip_test($ip,$iprule){ $ipruleregexp=str_replace('.*','ph',$iprule); $ipruleregexp=preg_quote($ipruleregexp,'/'); $ipruleregexp=str_replace('ph','\.[0-9]{1,3}',$ipruleregexp); if(preg_match('/^'.$ipruleregexp.'$/',$ip)) return true; else return false; }
实现了ip_test这个核心函数后,下面的过程就简单多了,无非就是简单的遍历名单中的每条规则,判断当前连接的IP是否符合规则,并进行对应的步骤。
白名单,当IP至少满足一条规则时继续执行操作
$curr_ip=$_SERVER['REMOTE_ADDR']; $white_list=array(...); //白名单规则 $test_success=false; foreach($white_list as $iprule){ if(ip_test($curr_ip,$iprule)){ $test_success=true; break; } } if(!$test_success) exit('IP not in white list');
黑名单,当IP不满足所有规则时继续执行操作
$curr_ip=$_SERVER['REMOTE_ADDR']; $black_list=array(...); //黑名单规则 foreach($black_list as $iprule){ if(ip_test($curr_ip,$iprule)){ exit('IP in black list'); } }
就这样,一个简单的PHP实现的IP黑白名单过滤就完成了。这篇博客主要是给那些主业务不是开发的人员,如:技术支持、运维等。由于太简单,原本不想写,后来那个同事感谢我帮忙,对我说这个他在网上找了很久,都没有找到合适的解决方案,我就想说不定这个还真有人需要呢。

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