PHP Trojan detection code sharing

<?php 
header(&#39;content-type:text/html;charset=gbk&#39;); 
set_time_limit(0);//防止超时 
/** 
* 
* php目录扫描监控增强版 
* 
* @version 1.0 
* 
下面几个变量使用前需要手动设置 
* 
**/ 
/*===================== 程序配置 =====================*/ 
$pass="test";//设置密码 
$jkdir="."; //设置监控扫描的目录，当前目录为&#39;.&#39;，上一级目录为&#39;..&#39;，也可以设置绝对路径，后面不要加斜杠，默认为当前目录 
$logfilename="./m.log";//设置存储log的路径，可以放置在任意位置 
$exclude=array(&#39;data&#39;,&#39;images&#39;);//排除目录 
$danger=&#39;eval|cmd|passthru|gzuncompress&#39;;//设置要查找的危险的函数 以确定是否木马文件 
$suffix=&#39;php|inc&#39;;//设置要扫描文件的后缀 
/*===================== 配置结束 =====================*/ 
$filename=$_GET[&#39;filename&#39;]; 
$check=$_GET[&#39;check&#39;]; 
$jumpoff=false; 
$url = $_SERVER[&#39;PHP_SELF&#39;]; 
$thisfile = end(explode(&#39;/&#39;,$url)); 
$jump="{$thisfile}|".implode(&#39;|&#39;,$exclude); 
$jkdir_num=$file_num=$danger_num=0; 
define(&#39;M_PATH&#39;,$jkdir); 
define(&#39;M_LOG&#39;,$logfilename); 
if ($check==&#39;check&#39;) 
{ 
$safearr = explode("|",$jump); 
$start_time=microtime(true); 
safe_check($jkdir); 
$end_time=microtime(true); 
$total=$end_time-$start_time; 
$file_num=$file_num-$jkdir_num; 
$message= " 文件数:".$file_num; 
$message.= " 文件夹数：".$jkdir_num; 
$message.= " 可疑文件数：".$danger_num; 
$message.= " 执行时间：".$total; 
echo $message; 
}else{ 
if ($_GET[&#39;m&#39;]=="del") Delete();//处理文件删除 
//读取文件内容 
if(isset($_GET[&#39;readfile&#39;])){ 
//输出查看密码，密码校验正确以后输出文件内容 
if(empty($_POST[&#39;passchack&#39;])){ 
  echo"<form id=\"form1\" name=\"form1\" method=\"post\">" 
  . " <label>pass" 
  . " <input type=\"text\" name=\"passchack\" />" 
  . " </label>" 
  . " <input type=\"submit\" name=\"Submit\" value=\"提交\" />" 
  . "</form>" 
  .""; 
  exit; 
}elseif(isset($_POST[&#39;passchack&#39;])&&$_POST[&#39;passchack&#39;]==$pass){ 
  $code=file_get_contents($_GET[&#39;readfile&#39;]); 
  echo"<textarea name=\"code\" cols=\"150\" rows=\"30\" id=\"code\" style=&#39;width:100%;height:450px;background:#cccccc;&#39;>{$code}</textarea>"; 
  exit; 
}else{ 
  exit; 
} 
}else{ 
record_md5(M_PATH); 
if(file_exists(M_LOG)){ 
    $log = unserialize(file_get_contents(M_LOG)); 
}else{ 
    $log = array(); 
} 
if($_GET[&#39;savethis&#39;]==1){ 
//保存当前文件md5到日志文件 
@unlink(M_LOG); 
file_put_contents(M_LOG,serialize($file_list)); 
echo "<a href=&#39;scandir.php&#39;>保存成功！点击返回</a>"; 
exit; 
} 
if(empty($log)){ 
echo "当前还没有创建日志文件！点击[保存当前]创建日志文件！"; 
}else{ 
if($file_list==$log){ 
  echo "本文件夹没有做过任何改动！"; 
}else{ 
  if(count($file_list) > 0 ){ 
  foreach($file_list as $file => $md5){ 
  if(!isset($log[$file])){ 
   echo "新增文件：<a href={$file} target=&#39;_blank&#39;>".$file."</a>"." 创建时间：".date("Y-m-d H:i:s",filectime($file))." 修改时间：".date("Y-m-d H:i:s",filemtime($file))." <a href=?readfile={$file} target=&#39;_blank&#39;>源码</a><a href=&#39;?m=del&filename={$file}&#39; target=&#39;_blank&#39;>删除</u></a><br />"; 
  }else{ 
   if($log[$file] != $md5){ 
   echo "修改文件：<a href={$file} target=&#39;_blank&#39;>".$file."</a>"." 创建时间：".date("Y-m-d H:i:s",filectime($file))." 修改时间：".date("Y-m-d H:i:s",filemtime($file))." <a href=?readfile={$file} target=&#39;_blank&#39;>源码</a><br />"; 
   unset($log[$file]); 
   }else{ 
   unset($log[$file]); 
   } 
  } 
  } 
  } 
  if(count($log)>0){ 
  foreach($log as $file => $md5){ 
  echo "删除文件：<a href={$file} target=&#39;_blank&#39;>".$file."</a><br />"; 
  } 
  } 
  } 
} 
} 
} 
//计算md5 
function record_md5($jkdir){ 
    global $file_list,$exclude; 
    if(is_dir($jkdir)){ 
        $file=scandir($jkdir); 
        foreach($file as $f){ 
            if($f!=&#39;.&#39; && $f!=&#39;..&#39; && !in_array($f, $exclude)){ 
                $path = $jkdir.&#39;/&#39;.$f; 
                if(is_dir($path)){ 
                    record_md5($path); 
                }else{ 
                    $file_list[$path]=md5_file($path); 
                } 
            } 
        } 
    } 
} 
function Safe_Check($jkdir)//遍历文件 
{ 
global $danger ,$suffix ,$jkdir_num ,$file_num ,$danger_num; 
) or die(&#39;文件夹不存在&#39;) ; 
while ($file=$hand->read()) 
{ 
  $filename=$jkdir.&#39;/&#39;.$file; 
  if (!$jumpoff) { 
  if(Jump($filename))continue; 
  } 
  if(@is_dir($filename) && $file != &#39;.&#39; && $file!= &#39;..&#39;&& $file!=&#39;./..&#39;) 
  {  $jkdir_num++; 
  Safe_Check($filename); 
  } 
  if (preg_match_all ("/\.($suffix)/i",$filename,$out)) 
  { 
  $str=&#39;&#39;; 
  $fp = @fopen($filename,&#39;r&#39;)or die(&#39;没有权限&#39;); 
  while(!feof($fp)) 
  { 
  $str .= fgets($fp,1024); 
  } 
  fclose($fp); 
  if( preg_match_all ("/($danger)[ \r\n\t]{0,}([\[\(])/i",$str,$out)) 
  { 
  echo "<font color=&#39;green&#39; style=&#39;font-size:14px&#39;>可疑文件：{$filename}</font>"." 创建时间：".date("Y-m-d H:i:s",filectime($filename))." 修改时间：".date("Y-m-d H:i:s",filemtime($filename))." <a href=&#39;?readfile={$filename}&#39; target=&#39;_blank&#39;><u>查看代码</u></a> <a href=&#39;?m=del&filename=$filename&#39; target=&#39;_blank&#39;>删除</u></a><br>"; 
  $danger_num++; 
  } 
  } 
  $file_num++; 
} 
} 
function Edit()//查看可疑文件 
{ 
global $filename; 
$filename = str_replace("..","",$filename); 
$file = $filename; 
$content = ""; 
if(is_file($file)) 
{ 
  $fp = fopen($file,"r")or die(&#39;没有权限&#39;); 
  $content = fread($fp,filesize($file)); 
  fclose($fp); 
  $content = htmlspecialchars($content); 
} 
echo "<textarea name=&#39;str&#39; style=&#39;width:100%;height:450px;background:#cccccc;&#39;>$content</textarea>\r\n"; 
exit(); 
} 
function Delete()//删除文件 
{ global $filename,$pass; 
if(empty($_POST[&#39;passchack&#39;])){ 
  echo"<form id=\"form1\" name=\"form1\" method=\"post\">" 
  . " <label>pass" 
  . " <input type=\"text\" name=\"passchack\" />" 
  . " </label>" 
  . " <input type=\"submit\" name=\"Submit\" value=\"提交\" />" 
  . "</form>" 
  .""; 
  exit; 
}elseif(isset($_POST[&#39;passchack&#39;])&&$_POST[&#39;passchack&#39;]==$pass){ 
  (is_file($filename))?($mes=unlink($filename)?&#39;删除成功&#39;:&#39;删除失败 查看权限&#39;):&#39;&#39;; 
  echo $mes; 
  exit(); 
}else{ 
  echo &#39;密码错误！&#39;; 
  exit; 
} 
} 
function Jump($file)//跳过文件 
{ 
global $jump,$safearr; 
if($jump != &#39;&#39;) 
{ 
  foreach($safearr as $v) 
  { 
  if($v==&#39;&#39;) continue; 
  if( eregi($v,$file) ) return true ; 
  } 
} 
return false; 
} 
?> 
<a href="scandir.php">[查看文件改动]</a>|<a href="scandir.php?savethis=1">[保存当前文件指纹]</a>|<a href="scandir.php?check=check">[扫描可疑文件]</a>