Srun login and logout by php

srun.php

<?php
/*
 *Creat At 2012/10/25 23:29
 *Author: Austin
 *URL: http://imnerd.org
 *Mail: i@imnerd.org
 *Description: Srun Authorize Login & Logout By PHP
 */
 
  //网关登陆：http://abc.com/srun.php?do=login
  //网关退出：http://abc.com/srun.php?do=logout
   
  //将自己的账号,密码,Mac地址填写到两个分号中
  //Mac地址的格式为aa:bb:cc:dd,全部为小写
  define('username', '');
  define('password', '');
  define('mac', '');
  
  /*下面的就不用改了,嘻嘻!*/
  define('host', '202.204.105.195');
  function curl($data, $url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_POST, TRUE);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
    $result = curl_exec($curl);
    curl_close($curl);
    return $result;
  }
  
  switch($_GET['do']) {
    case 'login':
      $data = 'username='.username.'&password='.password.'&mac='.mac.'&n=99&type=3';
      $url = 'http://'.host.':3333/cgi-bin/do_login';
      $uid = curl($data, $url);
      echo file_put_contents('uid.txt', $uid) ? 'Success!' : 'Failed!';
    break;
    
    case 'logout':
      if(file_exists('uid.txt')) { 
        $uid = file_get_contents('uid.txt');
      } else {
        die('not login yet!');
      }
      $data = 'uid='.$uid;
      $url = 'http://'.host.':3333/cgi-bin/do_logout';
      $result = curl($data, $url);
      print_r($result);
    break;
    
    default:
      die('Bug for u!');
    break;
  }
?>