
<?php
  include "../../config.php";
  if($_GET['view_source']) view_source();
?><html>
<head>
<title>Challenge 37</title>
</head>
<body>
<?php
  $db = dbconnect();
  $query = "select flag from challenge where idx=37";
  $flag = mysqli_fetch_array(mysqli_query($db,$query))['flag'];
  $time = time();

  $p = fopen("./tmp/tmp-{$time}","w");
  fwrite($p,"127.0.0.1");
  fclose($p);

  $file_nm = $_FILES['upfile']['name'];
  $file_nm = str_replace("<","",$file_nm);
  $file_nm = str_replace(">","",$file_nm);
  $file_nm = str_replace(".","",$file_nm);
  $file_nm = str_replace("/","",$file_nm);
  $file_nm = str_replace(" ","",$file_nm);

  if($file_nm){
    $p = fopen("./tmp/{$file_nm}","w");
    fwrite($p,$_SERVER['REMOTE_ADDR']);
    fclose($p);
  }

  echo "<pre>";
  $dirList = scandir("./tmp");
  for($i=0;$i<=count($dirList);$i++){
    echo "{$dirList[$i]}\n";
  }
  echo "</pre>";

  $host = file_get_contents("tmp/tmp-{$time}");

  $request = "GET /?{$flag} HTTP/1.0\r\n";
  $request .= "Host: {$host}\r\n";
  $request .= "\r\n";

  $socket = fsockopen($host,7777,$errstr,$errno,1);
  fputs($socket,$request);
  fclose($socket);

  if(count($dirList) > 20) system("rm -rf ./tmp/*");
?>
<form method=post enctype="multipart/form-data" action=index.php>
<input type=file name=upfile><input type=submit>
</form>
<a href=./?view_source=1>view-source</a>
</body>
</html>