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 <?php
 
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Mail
  * @subpackage Protocol
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * @see Zend_Validate
  */
 // require_once 'Zend/Validate.php';
 
 
 /**
  * @see Zend_Validate_Hostname
  */
 // require_once 'Zend/Validate/Hostname.php';
 
 
 /**
  * Zend_Mail_Protocol_Abstract
  *
  * Provides low-level methods for concrete adapters to communicate with a remote mail server and track requests and responses.
  *
  * @category   Zend
  * @package    Zend_Mail
  * @subpackage Protocol
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  * @todo Implement proxy settings
  */
 abstract class Zend_Mail_Protocol_Abstract
 {
     /**
      * Mail default EOL string
      */
     const EOL = "\r\n";
 
 
     /**
      * Default timeout in seconds for initiating session
      */
     const TIMEOUT_CONNECTION = 30;
 
     /**
      * Maximum of the transaction log
      * @var integer
      */
     protected $_maximumLog = 64;
 
 
     /**
      * Hostname or IP address of remote server
      * @var string
      */
     protected $_host;
 
 
     /**
      * Port number of connection
      * @var integer
      */
     protected $_port;
 
 
     /**
      * Instance of Zend_Validate to check hostnames
      * @var Zend_Validate
      */
     protected $_validHost;
 
 
     /**
      * Socket connection resource
      * @var resource
      */
     protected $_socket;
 
 
     /**
      * Last request sent to server
      * @var string
      */
     protected $_request;
 
 
     /**
      * Array of server responses to last request
      * @var array
      */
     protected $_response;
 
 
     /**
      * String template for parsing server responses using sscanf (default: 3 digit code and response string)
      * @var resource
      * @deprecated Since 1.10.3
      */
     protected $_template = '%d%s';
 
 
     /**
      * Log of mail requests and server responses for a session
      * @var array
      */
     private $_log = array();
 
 
     /**
      * Constructor.
      *
      * @param  string  $host OPTIONAL Hostname of remote connection (default: 127.0.0.1)
      * @param  integer $port OPTIONAL Port number (default: null)
      * @throws Zend_Mail_Protocol_Exception
      * @return void
      */
     public function __construct($host = '127.0.0.1', $port = null)
     {
         $this->_validHost = new Zend_Validate();
         $this->_validHost->addValidator(new Zend_Validate_Hostname(Zend_Validate_Hostname::ALLOW_ALL));
 
         if (!$this->_validHost->isValid($host)) {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception(join(', ', $this->_validHost->getMessages()));
         }
 
         $this->_host = $host;
         $this->_port = $port;
     }
 
 
     /**
      * Class destructor to cleanup open resources
      *
      * @return void
      */
     public function __destruct()
     {
         $this->_disconnect();
     }
 
     /**
      * Set the maximum log size
      *
      * @param integer $maximumLog Maximum log size
      * @return void
      */
     public function setMaximumLog($maximumLog)
     {
         $this->_maximumLog = (int) $maximumLog;
     }
 
 
     /**
      * Get the maximum log size
      *
      * @return int the maximum log size
      */
     public function getMaximumLog()
     {
         return $this->_maximumLog;
     }
 
 
     /**
      * Create a connection to the remote host
      *
      * Concrete adapters for this class will implement their own unique connect scripts, using the _connect() method to create the socket resource.
      */
     abstract public function connect();
 
 
     /**
      * Retrieve the last client request
      *
      * @return string
      */
     public function getRequest()
     {
         return $this->_request;
     }
 
 
     /**
      * Retrieve the last server response
      *
      * @return array
      */
     public function getResponse()
     {
         return $this->_response;
     }
 
 
     /**
      * Retrieve the transaction log
      *
      * @return string
      */
     public function getLog()
     {
         return implode('', $this->_log);
     }
 
 
     /**
      * Reset the transaction log
      *
      * @return void
      */
     public function resetLog()
     {
         $this->_log = array();
     }
 
     /**
      * Add the transaction log
      *
      * @param  string new transaction
      * @return void
      */
     protected function _addLog($value)
     {
         if ($this->_maximumLog >= 0 && count($this->_log) >= $this->_maximumLog) {
             array_shift($this->_log);
         }
 
         $this->_log[] = $value;
     }
 
     /**
      * Connect to the server using the supplied transport and target
      *
      * An example $remote string may be 'tcp://mail.example.com:25' or 'ssh://hostname.com:2222'
      *
      * @param  string $remote Remote
      * @throws Zend_Mail_Protocol_Exception
      * @return boolean
      */
     protected function _connect($remote)
     {
         $errorNum = 0;
         $errorStr = '';
 
         // open connection
         $this->_socket = @stream_socket_client($remote, $errorNum, $errorStr, self::TIMEOUT_CONNECTION);
 
         if ($this->_socket === false) {
             if ($errorNum == 0) {
                 $errorStr = 'Could not open socket';
             }
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception($errorStr);
         }
 
         if (($result = $this->_setStreamTimeout(self::TIMEOUT_CONNECTION)) === false) {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception('Could not set stream timeout');
         }
 
         return $result;
     }
 
 
     /**
      * Disconnect from remote host and free resource
      *
      * @return void
      */
     protected function _disconnect()
     {
         if (is_resource($this->_socket)) {
             fclose($this->_socket);
         }
     }
 
 
     /**
      * Send the given request followed by a LINEEND to the server.
      *
      * @param  string $request
      * @throws Zend_Mail_Protocol_Exception
      * @return integer|boolean Number of bytes written to remote host
      */
     protected function _send($request)
     {
         if (!is_resource($this->_socket)) {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception('No connection has been established to ' . $this->_host);
         }
 
         $this->_request = $request;
 
         $result = fwrite($this->_socket, $request . self::EOL);
 
         // Save request to internal log
         $this->_addLog($request . self::EOL);
 
         if ($result === false) {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception('Could not send request to ' . $this->_host);
         }
 
         return $result;
     }
 
 
     /**
      * Get a line from the stream.
      *
      * @var    integer $timeout Per-request timeout value if applicable
      * @throws Zend_Mail_Protocol_Exception
      * @return string
      */
     protected function _receive($timeout = null)
     {
         if (!is_resource($this->_socket)) {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception('No connection has been established to ' . $this->_host);
         }
 
         // Adapters may wish to supply per-commend timeouts according to appropriate RFC
         if ($timeout !== null) {
             $this->_setStreamTimeout($timeout);
         }
 
         // Retrieve response
         $reponse = fgets($this->_socket, 1024);
 
         // Save request to internal log
         $this->_addLog($reponse);
 
         // Check meta data to ensure connection is still valid
         $info = stream_get_meta_data($this->_socket);
 
         if (!empty($info['timed_out'])) {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception($this->_host . ' has timed out');
         }
 
         if ($reponse === false) {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception('Could not read from ' . $this->_host);
         }
 
         return $reponse;
     }
 
 
     /**
      * Parse server response for successful codes
      *
      * Read the response from the stream and check for expected return code.
      * Throws a Zend_Mail_Protocol_Exception if an unexpected code is returned.
      *
      * @param  string|array $code One or more codes that indicate a successful response
      * @throws Zend_Mail_Protocol_Exception
      * @return string Last line of response string
      */
     protected function _expect($code, $timeout = null)
     {
         $this->_response = array();
         $cmd  = '';
         $more = '';
         $msg  = '';
         $errMsg = '';
 
         if (!is_array($code)) {
             $code = array($code);
         }
 
         do {
             $this->_response[] = $result = $this->_receive($timeout);
             list($cmd, $more, $msg) = preg_split('/([\s-]+)/', $result, 2, PREG_SPLIT_DELIM_CAPTURE);
 
             if ($errMsg !== '') {
                 $errMsg .= ' ' . $msg;
             } elseif ($cmd === null || !in_array($cmd, $code)) {
                 $errMsg =  $msg;
             }
 
         } while (strpos($more, '-') === 0); // The '-' message prefix indicates an information string instead of a response string.
 
         if ($errMsg !== '') {
             /**
              * @see Zend_Mail_Protocol_Exception
              */
             // require_once 'Zend/Mail/Protocol/Exception.php';
             throw new Zend_Mail_Protocol_Exception($errMsg, $cmd);
         }
 
         return $msg;
     }
 
     /**
      * Set stream timeout
      *
      * @param integer $timeout
      * @return boolean
      */
     protected function _setStreamTimeout($timeout)
     {
        return stream_set_timeout($this->_socket, $timeout);
     }
 }