<?php

/**

 * PHPMailer RFC821 SMTP email transport class.

 * PHP Version 5

 * @package PHPMailer

 * @link https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project

 * @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)

 * @copyright 2014 Marcus Bointon

 * @copyright 2010 - 2012 Jim Jagielski

 * @copyright 2004 - 2009 Andy Prevost

 * @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 RFC821 SMTP email transport class.

 * Implements RFC 821 SMTP commands and provides some utility methods for sending mail to an SMTP server.

 * @package PHPMailer

 * @author Chris Ryan

 * @author Marcus Bointon <phpmailer@synchromedia.co.uk>

 */

class SMTP

{

    /**

     * The PHPMailer SMTP version number.

     * @var string

     */

    const VERSION = '5.2.22';

    /**

     * SMTP line break constant.

     * @var string

     */

    const CRLF = "\r\n";

    /**

     * The SMTP port to use if one is not specified.

     * @var integer

     */

    const DEFAULT_SMTP_PORT = 25;

    /**

     * The maximum line length allowed by RFC 2822 section 2.1.1

     * @var integer

     */

    const MAX_LINE_LENGTH = 998;

    /**

     * Debug level for no output

     */

    const DEBUG_OFF = 0;

    /**

     * Debug level to show client -> server messages

     */

    const DEBUG_CLIENT = 1;

    /**

     * Debug level to show client -> server and server -> client messages

     */

    const DEBUG_SERVER = 2;

    /**

     * Debug level to show connection status, client -> server and server -> client messages

     */

    const DEBUG_CONNECTION = 3;

    /**

     * Debug level to show all messages

     */

    const DEBUG_LOWLEVEL = 4;

    /**

     * The PHPMailer SMTP Version number.

     * @var string

     * @deprecated Use the `VERSION` constant instead

     * @see SMTP::VERSION

     */

    public $Version = '5.2.22';

    /**

     * SMTP server port number.

     * @var integer

     * @deprecated This is only ever used as a default value, so use the `DEFAULT_SMTP_PORT` constant instead

     * @see SMTP::DEFAULT_SMTP_PORT

     */

    public $SMTP_PORT = 25;

    /**

     * SMTP reply line ending.

     * @var string

     * @deprecated Use the `CRLF` constant instead

     * @see SMTP::CRLF

     */

    public $CRLF = "\r\n";

    /**

     * Debug output level.

     * Options:

     * * self::DEBUG_OFF (`0`) No debug output, default

     * * self::DEBUG_CLIENT (`1`) Client commands

     * * self::DEBUG_SERVER (`2`) Client commands and server responses

     * * self::DEBUG_CONNECTION (`3`) As DEBUG_SERVER plus connection status

     * * self::DEBUG_LOWLEVEL (`4`) Low-level data output, all messages

     * @var integer

     */

    public $do_debug = self::DEBUG_OFF;

    /**

     * How to handle debug output.

     * Options:

     * * `echo` Output plain-text as-is, appropriate for CLI

     * * `html` Output escaped, line breaks converted to `<br>`, appropriate for browser output

     * * `error_log` Output to error log as configured in php.ini

     *

     * Alternatively, you can provide a callable expecting two params: a message string and the debug level:

     * <code>

     * $smtp->Debugoutput = function($str, $level) {echo "debug level $level; message: $str";};

     * </code>

     * @var string|callable

     */

    public $Debugoutput = 'echo';

    /**

     * Whether to use VERP.

     * @link http://en.wikipedia.org/wiki/Variable_envelope_return_path

     * @link http://www.postfix.org/VERP_README.html Info on VERP

     * @var boolean

     */

    public $do_verp = false;

    /**

     * The timeout value for connection, in seconds.

     * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2

     * This needs to be quite high to function correctly with hosts using greetdelay as an anti-spam measure.

     * @link http://tools.ietf.org/html/rfc2821#section-4.5.3.2

     * @var integer

     */

    public $Timeout = 300;

    /**

     * How long to wait for commands to complete, in seconds.

     * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2

     * @var integer

     */

    public $Timelimit = 300;

	/**

	 * @var array patterns to extract smtp transaction id from smtp reply

	 * Only first capture group will be use, use non-capturing group to deal with it

	 * Extend this class to override this property to fulfil your needs.

	 */

	protected $smtp_transaction_id_patterns = array(

		'exim' => '/[0-9]{3} OK id=(.*)/',

		'sendmail' => '/[0-9]{3} 2.0.0 (.*) Message/',

		'postfix' => '/[0-9]{3} 2.0.0 Ok: queued as (.*)/'

	);

    /**

     * The socket for the server connection.

     * @var resource

     */

    protected $smtp_conn;

    /**

     * Error information, if any, for the last SMTP command.

     * @var array

     */

    protected $error = array(

        'error' => '',

        'detail' => '',

        'smtp_code' => '',

        'smtp_code_ex' => ''

    );

    /**

     * The reply the server sent to us for HELO.

     * If null, no HELO string has yet been received.

     * @var string|null

     */

    protected $helo_rply = null;

    /**

     * The set of SMTP extensions sent in reply to EHLO command.

     * Indexes of the array are extension names.

     * Value at index 'HELO' or 'EHLO' (according to command that was sent)

     * represents the server name. In case of HELO it is the only element of the array.

     * Other values can be boolean TRUE or an array containing extension options.

     * If null, no HELO/EHLO string has yet been received.

     * @var array|null

     */

    protected $server_caps = null;

    /**

     * The most recent reply received from the server.

     * @var string

     */

    protected $last_reply = '';

    /**

     * Output debugging info via a user-selected method.

     * @see SMTP::$Debugoutput

     * @see SMTP::$do_debug

     * @param string $str Debug string to output

     * @param integer $level The debug level of this message; see DEBUG_* constants

     * @return void

     */

    protected function edebug($str, $level = 0)

    {

        if ($level > $this->do_debug) {

            return;

        }

        //Avoid clash with built-in function names

        if (!in_array($this->Debugoutput, array('error_log', 'html', 'echo')) and is_callable($this->Debugoutput)) {

            call_user_func($this->Debugoutput, $str, $level);

            return;

        }

        switch ($this->Debugoutput) {

            case 'error_log':

                //Don't output, just log

                error_log($str);

                break;

            case 'html':

                //Cleans up output a bit for a better looking, HTML-safe output

                echo htmlentities(

                    preg_replace('/[\r\n]+/', '', $str),

                    ENT_QUOTES,

                    'UTF-8'

                )

                . "<br>\n";

                break;

            case 'echo':

            default:

                //Normalize line breaks

                $str = preg_replace('/(\r\n|\r|\n)/ms', "\n", $str);

                echo gmdate('Y-m-d H:i:s') . "\t" . str_replace(

                    "\n",

                    "\n                   \t                  ",

                    trim($str)

                )."\n";

        }

    }

    /**

     * Connect to an SMTP server.

     * @param string $host SMTP server IP or host name

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

     * @param integer $timeout How long to wait for the connection to open

     * @param array $options An array of options for stream_context_create()

     * @access public

     * @return boolean

     */

    public function connect($host, $port = null, $timeout = 30, $options = array())

    {

        static $streamok;

        //This is enabled by default since 5.0.0 but some providers disable it

        //Check this once and cache the result

        if (is_null($streamok)) {

            $streamok = function_exists('stream_socket_client');

        }

        // Clear errors to avoid confusion

        $this->setError('');

        // Make sure we are __not__ connected

        if ($this->connected()) {

            // Already connected, generate error

            $this->setError('Already connected to a server');

            return false;

        }

        if (empty($port)) {

            $port = self::DEFAULT_SMTP_PORT;

        }

        // Connect to the SMTP server

        $this->edebug(

            "Connection: opening to $host:$port, timeout=$timeout, options=".var_export($options, true),

            self::DEBUG_CONNECTION

        );

        $errno = 0;

        $errstr = '';

        if ($streamok) {

            $socket_context = stream_context_create($options);

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

            $this->smtp_conn = stream_socket_client(

                $host . ":" . $port,

                $errno,

                $errstr,

                $timeout,

                STREAM_CLIENT_CONNECT,

                $socket_context

            );

            restore_error_handler();

        } else {

            //Fall back to fsockopen which should work in more places, but is missing some features

            $this->edebug(

                "Connection: stream_socket_client not available, falling back to fsockopen",

                self::DEBUG_CONNECTION

            );

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

            $this->smtp_conn = fsockopen(

                $host,

                $port,

                $errno,

                $errstr,

                $timeout

            );

            restore_error_handler();

        }

        // Verify we connected properly

        if (!is_resource($this->smtp_conn)) {

            $this->setError(

                'Failed to connect to server',

                $errno,

                $errstr

            );

            $this->edebug(

                'SMTP ERROR: ' . $this->error['error']

                . ": $errstr ($errno)",

                self::DEBUG_CLIENT

            );

            return false;

        }

        $this->edebug('Connection: opened', self::DEBUG_CONNECTION);

        // SMTP server can take longer to respond, give longer timeout for first read

        // Windows does not have support for this timeout function

        if (substr(PHP_OS, 0, 3) != 'WIN') {

            $max = ini_get('max_execution_time');

            // Don't bother if unlimited

            if ($max != 0 && $timeout > $max) {

                @set_time_limit($timeout);

            }

            stream_set_timeout($this->smtp_conn, $timeout, 0);

        }

        // Get any announcement

        $announce = $this->get_lines();

        $this->edebug('SERVER -> CLIENT: ' . $announce, self::DEBUG_SERVER);

        return true;

    }

    /**

     * Initiate a TLS (encrypted) session.

     * @access public

     * @return boolean

     */

    public function startTLS()

    {

        if (!$this->sendCommand('STARTTLS', 'STARTTLS', 220)) {

            return false;

        }

        //Allow the best TLS version(s) we can

        $crypto_method = STREAM_CRYPTO_METHOD_TLS_CLIENT;

        //PHP 5.6.7 dropped inclusion of TLS 1.1 and 1.2 in STREAM_CRYPTO_METHOD_TLS_CLIENT

        //so add them back in manually if we can

        if (defined('STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT')) {

            $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT;

            $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT;

        }

        // Begin encrypted connection

        if (!stream_socket_enable_crypto(

            $this->smtp_conn,

            true,

            $crypto_method

        )) {

            return false;

        }

        return true;

    }

    /**

     * Perform SMTP authentication.

     * Must be run after hello().

     * @see hello()

     * @param string $username The user name

     * @param string $password The password

     * @param string $authtype The auth type (PLAIN, LOGIN, CRAM-MD5)

     * @param string $realm The auth realm for NTLM

     * @param string $workstation The auth workstation for NTLM

     * @param null|OAuth $OAuth An optional OAuth instance (@see PHPMailerOAuth)

     * @return bool True if successfully authenticated.* @access public

     */

    public function authenticate(

        $username,

        $password,

        $authtype = null,

        $realm = '',

        $workstation = '',

        $OAuth = null

    ) {

        if (!$this->server_caps) {

            $this->setError('Authentication is not allowed before HELO/EHLO');

            return false;

        }

        if (array_key_exists('EHLO', $this->server_caps)) {

        // SMTP extensions are available. Let's try to find a proper authentication method

            if (!array_key_exists('AUTH', $this->server_caps)) {

                $this->setError('Authentication is not allowed at this stage');

                // 'at this stage' means that auth may be allowed after the stage changes

                // e.g. after STARTTLS

                return false;

            }

            self::edebug('Auth method requested: ' . ($authtype ? $authtype : 'UNKNOWN'), self::DEBUG_LOWLEVEL);

            self::edebug(

                'Auth methods available on the server: ' . implode(',', $this->server_caps['AUTH']),

                self::DEBUG_LOWLEVEL

            );

            if (empty($authtype)) {

                foreach (array('CRAM-MD5', 'LOGIN', 'PLAIN') as $method) {

                    if (in_array($method, $this->server_caps['AUTH'])) {

                        $authtype = $method;

                        break;

                    }

                }

                if (empty($authtype)) {