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<?php

/**

* PHPMailer POP-Before-SMTP Authentication Class.

* PHP Version 5

* @package PHPMailer

* @link https://github.com/PHPMailer/PHPMailer/

* @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>

* @author Jim Jagielski (jimjag) <jimjag@gmail.com>

* @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>

* @author Brent R. Matzelle (original founder)

* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License

* @note This program is distributed in the hope that it will be useful - WITHOUT

* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

* FITNESS FOR A PARTICULAR PURPOSE.

/**

* PHPMailer POP-Before-SMTP Authentication Class.

* Specifically for PHPMailer to use for RFC1939 POP-before-SMTP authentication.

* Does not support APOP.

* @package PHPMailer

* @author Richard Davey (original author) <rich@corephp.co.uk>

* @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>

* @author Jim Jagielski (jimjag) <jimjag@gmail.com>

* @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>

class POP3

{

/**

* The POP3 PHPMailer Version number.

* @var string

* @access public

public $Version = '5.2.14';

/**

* Default POP3 port number.

* @var integer

* @access public

public $POP3_PORT = 110;

/**

* Default timeout in seconds.

* @var integer

* @access public

public $POP3_TIMEOUT = 30;

/**

* POP3 Carriage Return + Line Feed.

* @var string

* @access public

* @deprecated Use the constant instead

public $CRLF = "\r\n";

/**

* Debug display level.

* Options: 0 = no, 1+ = yes

* @var integer

* @access public

public $do_debug = 0;

/**

* POP3 mail server hostname.

* @var string

* @access public

public $host;

/**

* POP3 port number.

* @var integer

* @access public

public $port;

/**

* POP3 Timeout Value in seconds.

* @var integer

* @access public

public $tval;

/**

* POP3 username

* @var string

* @access public

public $username;

/**

* POP3 password.

* @var string

* @access public

public $password;

/**

* Resource handle for the POP3 connection socket.

* @var resource

* @access protected

protected $pop_conn;

/**

* Are we connected?

* @var boolean

* @access protected

protected $connected = false;

/**

* Error container.

* @var array

* @access protected

protected $errors = array();

/**

* Line break constant

const CRLF = "\r\n";

/**

* Simple static wrapper for all-in-one POP before SMTP

* @param $host

* @param integer|boolean $port The port number to connect to

* @param integer|boolean $timeout The timeout value

* @param string $username

* @param string $password

* @param integer $debug_level

* @return boolean

public static function popBeforeSmtp(

$host,

$port = false,

$timeout = false,

$username = '',

$password = '',

$debug_level = 0

) {

$pop = new POP3;

return $pop->authorise($host, $port, $timeout, $username, $password, $debug_level);

}

/**

* Authenticate with a POP3 server.

* A connect, login, disconnect sequence

* appropriate for POP-before SMTP authorisation.

* @access public

* @param string $host The hostname to connect to

* @param integer|boolean $port The port number to connect to

* @param integer|boolean $timeout The timeout value

* @param string $username

* @param string $password

* @param integer $debug_level

* @return boolean

public function authorise($host, $port = false, $timeout = false, $username = '', $password = '', $debug_level = 0)

{

$this->host = $host;

// If no port value provided, use default

if (false === $port) {

$this->port = $this->POP3_PORT;

} else {

$this->port = (integer)$port;

}

// If no timeout value provided, use default

if (false === $timeout) {

$this->tval = $this->POP3_TIMEOUT;

} else {

$this->tval = (integer)$timeout;

}

$this->do_debug = $debug_level;

$this->username = $username;

$this->password = $password;

//  Reset the error log

$this->errors = array();

//  connect

$result = $this->connect($this->host, $this->port, $this->tval);

if ($result) {

$login_result = $this->login($this->username, $this->password);

if ($login_result) {

$this->disconnect();

return true;

}

// We need to disconnect regardless of whether the login succeeded

$this->disconnect();

return false;

}

/**

* Connect to a POP3 server.

* @access public

* @param string $host

* @param integer|boolean $port

* @param integer $tval

* @return boolean

public function connect($host, $port = false, $tval = 30)

{

//  Are we already connected?

if ($this->connected) {

return true;

}

//On Windows this will raise a PHP Warning error if the hostname doesn't exist.

//Rather than suppress it with @fsockopen, capture it cleanly instead

set_error_handler(array($this, 'catchWarning'));

if (false === $port) {

$port = $this->POP3_PORT;

}

//  connect to the POP3 server

$this->pop_conn = fsockopen(

$host, //  POP3 Host

$port, //  Port #

$errno, //  Error Number

$errstr, //  Error Message

$tval

); //  Timeout (seconds)

//  Restore the error handler

restore_error_handler();

//  Did we connect?

if (false === $this->pop_conn) {

//  It would appear not...

$this->setError(array(

'error' => "Failed to connect to server $host on port $port",

'errno' => $errno,

'errstr' => $errstr

));

return false;

}

//  Increase the stream time-out

stream_set_timeout($this->pop_conn, $tval, 0);

//  Get the POP3 server response

$pop3_response = $this->getResponse();

//  Check for the +OK

if ($this->checkResponse($pop3_response)) {

//  The connection is established and the POP3 server is talking

$this->connected = true;

return true;

}

return false;

}

/**

* Log in to the POP3 server.

* Does not support APOP (RFC 2828, 4949).

* @access public

* @param string $username

* @param string $password

* @return boolean

public function login($username = '', $password = '')

{

if (!$this->connected) {

$this->setError('Not connected to POP3 server');

}

if (empty($username)) {

$username = $this->username;

}

if (empty($password)) {

$password = $this->password;

}

// Send the Username

$this->sendString("USER $username" . self::CRLF);

$pop3_response = $this->getResponse();

if ($this->checkResponse($pop3_response)) {

// Send the Password

$this->sendString("PASS $password" . self::CRLF);

$pop3_response = $this->getResponse();

if ($this->checkResponse($pop3_response)) {

return true;

}

return false;

}

/**

* Disconnect from the POP3 server.

* @access public

public function disconnect()

{

$this->sendString('QUIT');

//The QUIT command may cause the daemon to exit, which will kill our connection

//So ignore errors here

try {

@fclose($this->pop_conn);

} catch (Exception $e) {

//Do nothing

};

}

/**

* Get a response from the POP3 server.

* $size is the maximum number of bytes to retrieve

* @param integer $size

* @return string

* @access protected

protected function getResponse($size = 128)

{

$response = fgets($this->pop_conn, $size);

if ($this->do_debug >= 1) {

echo "Server -> Client: $response";

}

return $response;

}

/**

* Send raw data to the POP3 server.

* @param string $string

* @return integer

* @access protected

protected function sendString($string)

{

if ($this->pop_conn) {

if ($this->do_debug >= 2) { //Show client messages when debug >= 2

echo "Client -> Server: $string";

}

return fwrite($this->pop_conn, $string, strlen($string));

}

return 0;

}

/**

* Checks the POP3 server response.

* Looks for for +OK or -ERR.

* @param string $string

* @return boolean

* @access protected

protected function checkResponse($string)

{

if (substr($string, 0, 3) !== '+OK') {

$this->setError(array(

'error' => "Server reported an error: $string",

'errno' => 0,

'errstr' => ''

));

return false;

} else {

return true;

}

/**

* Add an error to the internal error store.

* Also display debug output if it's enabled.

* @param $error

* @access protected

protected function setError($error)

{

$this->errors[] = $error;

if ($this->do_debug >= 1) {

echo '<pre>';

foreach ($this->errors as $error) {

print_r($error);

}

echo '</pre>';

}

/**

* Get an array of error messages, if any.

* @return array

public function getErrors()

{

return $this->errors;

}

/**

* POP3 connection error handler.

* @param integer $errno

* @param string $errstr

* @param string $errfile

* @param integer $errline

* @access protected

protected function catchWarning($errno, $errstr, $errfile, $errline)

{

$this->setError(array(

'error' => "Connecting to the POP3 server raised a PHP warning: ",

'errno' => $errno,

'errstr' => $errstr,

'errfile' => $errfile,

'errline' => $errline

));

}

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