基于Discuz security.inc.php代码的深入分析

代码如下所示：

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 300) {
securitymessage('attachsave_4_subject', 'attachsave_4_message');
}
}

 
//如果需要回答问题，则判断为8
if($attackevasive & 8) {
list($questionkey, $questionanswer, $questiontime) = explode('|', authcode($_DCOOKIE['secqcode'], 'DECODE'));
include_once DISCUZ_ROOT.'./forumdata/cache/cache_secqaa.php';
if(!$questionanswer || !$questiontime || $_DCACHE['secqaa'][$questionkey]['answer'] != $questionanswer) {

if(empty($_POST['secqsubmit']) || (!empty($_POST['secqsubmit']) && $_DCACHE['secqaa'][$questionkey]['answer'] != md5($_POST['answer']))) {
$questionkey = array_rand($_DCACHE['secqaa']);
dsetcookie('secqcode', authcode($questionkey.'||'.$timestamp, 'ENCODE'), $timestamp + 816400, 1, true);
securitymessage($_DCACHE['secqaa'][$questionkey]['question'], '', FALSE, TRUE);
} else {
dsetcookie('secqcode', authcode($questionkey.'|'.$_DCACHE['secqaa'][$questionkey]['answer'].'|'.$timestamp, 'ENCODE'), $timestamp + 816400, 1, true);
}
}

}

/**
 * 输出被攻击提示语言，如果是ajax，展示一個错误層， 如果是請求， 則展示错误頁面
 * @param $subject
 * @param $message
 * @param $reload
 * @param $form
 * @return unknown_type
 */
function securitymessage($subject, $message, $reload = TRUE, $form = FALSE) {

$scuritylang = array(
'attachsave_1_subject' => '频繁刷新限制',
'attachsave_1_message' => '您访问本站速度过快或者刷新间隔时间小于两秒！请等待页面自动跳转 ...',
'attachsave_2_subject' => '代理服务器访问限制',
'attachsave_2_message' => '本站现在限制使用代理服务器访问，请去除您的代理设置，直接访问本站。',
'attachsave_4_subject' => '页面重载开启',
'attachsave_4_message' => '欢迎光临本站，页面正在重新载入，请稍候 ...'
);

$subject = $scuritylang[$subject] ? $scuritylang[$subject] : $subject;
$message = $scuritylang[$message] ? $scuritylang[$message] : $message;
if($_GET['inajax']) {
ajaxshowheader();
echo '
'.$subject.'

'.$message.'
';
ajaxshowfooter();
} else {
echo '';
echo '';
echo '';
echo '';
echo '';
if($reload) {
echo '';
}
if($form) {
echo '
';
}
echo '';
echo '  ';
echo '    ';
echo '  ';
echo '
';
echo '    ';
echo '    ';
echo '      ';
echo '    ';
echo '    
';
echo '     

 '.$subject.' 

';
echo $message;
echo '        

';
echo '      
';
echo '    
';
if($form) {
echo '
';
}
echo '';
echo '';
}
exit();
}

 
function ajaxshowheader() {
global $charset, $inajax;
ob_end_clean();
@header("Expires: -1");
@header("Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0", FALSE);
@header("Pragma: no-cache");
header("Content-type: application/xml");
echo "/n';
}

?>