IP及IP段进行访问限制

来源:互联网 发布:mac os 10.12 xcode 编辑:程序博客网 时间:2024/06/04 19:44
IP及IP段进行访问限制
转自:http://hudeyong926.iteye.com/blog/1584554

<?php$oblock_ip = new block_ip();$boolean = $oblock_ip->checkip();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);}}?>


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<?php/*子网掩码“长”得和 IP 地址类似,比如:255.255.255.0。可以用它来做逻辑 AND 运算判断是否要把数据包发送到外网(区分子网) 。比如我们已知 IP 为 202.202.15.0,子网掩码为 255.255.255.0(24 个 1) ,那么我们可以把这个网段描述为202.202.15.0:24。 现在我要判断202.212.16.238这个地址是否在202.202.15.0:24这个网络中。可以这么做:由于掩码为 24 位,你可以理解为只要IP 地址和网络地址的前 24 位相同,那就是同一个网络了。先用二进制来实现。把24(即 255.255.255.0)转换成掩码,也就是 24 个 1。11111111.11111111.11111111.00000000然后,11111111 11111111 11111111 00000000(255.255.255.0)AND 11001010 11001010 00010000 11101110(202.212.16.238)=11001010 11001010 00010000 00000000(202.202.16.0)202.202.16.0!=202.202.15.0,所以不在网络地址内。用 PHP 代码来表示如下:*/function ip_in_network($ip, $net_addr, $net_mask){if($net_mask <= 0){ return false; }$ip_binary_string = sprintf("%032b",ip2long($ip));$net_binary_string = sprintf("%032b",ip2long($net_addr));return (substr_compare($ip_binary_string,$net_binary_string,0,$net_mask) === 0);}var_dump(ip_in_network('202.202.16.0', '202.202.16.10', 24));?>