phpの共通ライブラリに埋め込むタイプのアクセス拒否スクリプト

某方のお勉強用にサッと書いた、解説はあえてつけていない。

[code language=”php”]
<?php
class IgnoreAccess
{
public $hosts_list = array();
public $ua_list = array();
public $ref_list = array();
private function set_403()
{
header("HTTP",true,403);
exit(1);
}
private function check_array($array=array())
{
if (is_array($array)!==FALSE && count($array)>0)
{
return TRUE;
}
else
{
return FALSE;
}
}
private function is_host($addr="")
{
if ($addr == gethostbyaddr($addr))
{
return FALSE;
}
else
{
return TRUE;
}
}
public function ignore($param=array(),$not_ipv4=FALSE)
{
$local_addr = array("127.0.","192.168.","::1");
foreach($local_addr as $val)
{
if (substr_count($param["addr"],$val)>0)
{
return FALSE;
}
}
if ($not_ipv4!==FALSE && $this->is_host($param["addr"])===FALSE)
{
$this->set_403();
}
if ($this->check_array($this->ua_list)!==FALSE)
{
foreach ($this->ua_list as $val)
{
if (substr_count($param["ua"],$val)>0)
{
$this->set_403();
}
}
}
if ($this->check_array($this->hosts_list)!==FALSE)
{
foreach ($this->hosts_list as $val)
{
if (substr_count(gethostbyaddr($param["addr"]),$val)>0)
{
$this->set_403();
}
}
}
if ($this->check_array($this->ref_list)!==FALSE && strlen($param["ref"])>0)
{
foreach ($this->ref_list as $val)
{
if (substr_count($param["ref"],$val)>0)
{
$this->set_403();
}
}
}
}
}
$my_ignore_access = new IgnoreAccess;

$my_ignore_access->hosts_list = array(
"ignore_host_a.net",
"ignore_host_b.net",
"ignore_host_c.net"
);

$my_ignore_access->ua_list = array(
"ignore_ua_a",
"ignore_ua_b",
"ignore_ua_c"
);

$my_ignore_access->ref_list = array(
"ignore_referer_a.net",
"ignore_referer_b.net",
"ignore_referer_c.net"
);

$ignore_point["ip"] = (isset($_SERVER["REMOTE_ADDR"])) ? $_SERVER["REMOTE_ADDR"] : NULL;
$ignore_point["ua"] = (isset($_SERVER["HTTP_USER_AGENT"])) ? $_SERVER["HTTP_USER_AGENT"] : NULL;
$ignore_point["referer"] = (isset($_SERVER["HTTP_REFERER"])) ? $_SERVER["HTTP_REFERER"] : NULL;
$my_ignore_access->ignore($ignore_point,FALSE);
[/code]