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<?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.
 
     * @type string
 
     */
 
    const VERSION = '5.2.10';
 
 
 
    /**
 
     * SMTP line break constant.
 
     * @type string
 
     */
 
    const CRLF = " ";
 
 
 
    /**
 
     * The SMTP port to use if one is not specified.
 
     * @type integer
 
     */
 
    const DEFAULT_SMTP_PORT = 25;
 
 
 
    /**
 
     * The maximum line length allowed by RFC 2822 section 2.1.1
 
     * @type 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.
 
     * @type string
 
     * @deprecated Use the `VERSION` constant instead
 
     * @see SMTP::VERSION
 
     */
 
    public $Version = '5.2.10';
 
 
 
    /**
 
     * SMTP server port number.
 
     * @type 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.
 
     * @type string
 
     * @deprecated Use the `CRLF` constant instead
 
     * @see SMTP::CRLF
 
     */
 
    public $CRLF = " ";
 
 
 
    /**
 
     * 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
 
     * @type 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>
 
     * @type 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
 
     * @type 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
 
     * @type 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
 
     * @type integer
 
     */
 
    public $Timelimit = 300;
 
 
 
    /**
 
     * The socket for the server connection.
 
     * @type resource
 
     */
 
    protected $smtp_conn;
 
 
 
    /**
 
     * Error information, if any, for the last SMTP command.
 
     * @type 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.
 
     * @type 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.
 
     * @type array|null
 
     */
 
    protected $server_caps = null;
 
 
 
    /**
 
     * The most recent reply received from the server.
 
     * @type 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, $this->do_debug);
 
            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('/[ ]+/', '', $str),
 
                    ENT_QUOTES,
 
                    'UTF-8'
 
                )
 
                . "<br> ";
 
                break;
 
            case 'echo':
 
            default:
 
                //Normalize line breaks
 
                $str = preg_replace('/( | | )/ms', " ", $str);
 
                echo gmdate('Y-m-d H:i:s') . " " . str_replace(
 
                    " ",
 
                    "                                    ",
 
                    trim($str)
 
                )." ";
 
        }
 
    }
 
 
 
    /**
 
     * 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);
 
            //Suppress errors; connection failures are handled at a higher level
 
            $this->smtp_conn = @stream_socket_client(
 
                $host . ":" . $port,
 
                $errno,
 
                $errstr,
 
                $timeout,
 
                STREAM_CLIENT_CONNECT,
 
                $socket_context
 
            );
 
        } 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
 
            );
 
            $this->smtp_conn = fsockopen(
 
                $host,
 
                $port,
 
                $errno,
 
                $errstr,
 
                $timeout
 
            );
 
        }
 
        // 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;
 
        }
 
        // Begin encrypted connection
 
        if (!stream_socket_enable_crypto(
 
            $this->smtp_conn,
 
            true,
 
            STREAM_CRYPTO_METHOD_TLS_CLIENT
 
        )) {
 
            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, NTLM, CRAM-MD5)
 
     * @param string $realm       The auth realm for NTLM
 
     * @param string $workstation The auth workstation for NTLM
 
     * @access public
 
     * @return boolean True if successfully authenticated.
 
     */
 
    public function authenticate(
 
        $username,
 
        $password,
 
        $authtype = null,
 
        $realm = '',
 
        $workstation = ''
 
    ) {
 
        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('LOGIN', 'CRAM-MD5', 'NTLM', 'PLAIN') as $method) {
 
                    if (in_array($method, $this->server_caps['AUTH'])) {
 
                        $authtype = $method;
 
                        break;
 
                    }
 
                }
 
                if (empty($authtype)) {
 
                    $this->setError('No supported authentication methods found');
 
                    return false;
 
                }
 
                self::edebug('Auth method selected: '.$authtype, self::DEBUG_LOWLEVEL);
 
            }
 
 
 
            if (!in_array($authtype, $this->server_caps['AUTH'])) {
 
                $this->setError("The requested authentication method "$authtype" is not supported by the server");
 
                return false;
 
            }
 
        } elseif (empty($authtype)) {
 
            $authtype = 'LOGIN';
 
        }
 
        switch ($authtype) {
 
            case 'PLAIN':
 
                // Start authentication
 
                if (!$this->sendCommand('AUTH', 'AUTH PLAIN', 334)) {
 
                    return false;
 
                }
 
                // Send encoded username and password
 
                if (!$this->sendCommand(
 
                    'User & Password',
 
                    base64_encode("" . $username . "" . $password),
 
                    235
 
                )
 
                ) {
 
                    return false;
 
                }
 
                break;
 
            case 'LOGIN':
 
                // Start authentication
 
                if (!$this->sendCommand('AUTH', 'AUTH LOGIN', 334)) {
 
                    return false;
 
                }
 
                if (!$this->sendCommand("Username", base64_encode($username), 334)) {
 
                    return false;
 
                }
 
                if (!$this->sendCommand("Password", base64_encode($password), 235)) {
 
                    return false;
 
                }
 
                break;
 
            case 'NTLM':
 
                /*
 
                 * ntlm_sasl_client.php
 
                 * Bundled with Permission
 
                 *
 
                 * How to telnet in windows:
 
                 * http://technet.microsoft.com/en-us/library/aa995718%28EXCHG.65%29.aspx
 
                 * PROTOCOL Docs http://curl.haxx.se/rfc/ntlm.html#ntlmSmtpAuthentication
 
                 */
 
                require_once 'extras/ntlm_sasl_client.php';
 
                $temp = new stdClass;
 
                $ntlm_client = new ntlm_sasl_client_class;
 
                //Check that functions are available
 
                if (!$ntlm_client->Initialize($temp)) {
 
                    $this->setError($temp->error);
 
                    $this->edebug(
 
                        'You need to enable some modules in your php.ini file: '
 
                        . $this->error['error'],
 
                        self::DEBUG_CLIENT
 
                    );
 
                    return false;
 
                }
 
                //msg1
 
                $msg1 = $ntlm_client->TypeMsg1($realm, $workstation); //msg1
 
 
 
                if (!$this->sendCommand(
 
                    'AUTH NTLM',
 
                    'AUTH NTLM ' . base64_encode($msg1),
 
                    334
 
                )
 
                ) {
 
                    return false;
 
                }
 
                //Though 0 based, there is a white space after the 3 digit number
 
                //msg2
 
                $challenge = substr($this->last_reply, 3);
 
                $challenge = base64_decode($challenge);
 
                $ntlm_res = $ntlm_client->NTLMResponse(
 
                    substr($challenge, 24, 8),
 
                    $password
 
                );
 
                //msg3
 
                $msg3 = $ntlm_client->TypeMsg3(
 
                    $ntlm_res,
 
                    $username,
 
                    $realm,
 
                    $workstation
 
                );
 
                // send encoded username
 
                return $this->sendCommand('Username', base64_encode($msg3), 235);
 
            case 'CRAM-MD5':
 
                // Start authentication
 
                if (!$this->sendCommand('AUTH CRAM-MD5', 'AUTH CRAM-MD5', 334)) {
 
                    return false;
 
                }
 
                // Get the challenge
 
                $challenge = base64_decode(substr($this->last_reply, 4));
 
 
 
                // Build the response
 
                $response = $username . ' ' . $this->hmac($challenge, $password);
 
 
 
                // send encoded credentials
 
                return $this->sendCommand('Username', base64_encode($response), 235);
 
            default:
 
                $this->setError("Authentication method "$authtype" is not supported");
 
                return false;
 
        }
 
        return true;
 
    }
 
 
 
    /**
 
     * Calculate an MD5 HMAC hash.
 
     * Works like hash_hmac('md5', $data, $key)
 
     * in case that function is not available
 
     * @param string $data The data to hash
 
     * @param string $key  The key to hash with
 
     * @access protected
 
     * @return string
 
     */
 
    protected function hmac($data, $key)
 
    {
 
        if (function_exists('hash_hmac')) {
 
            return hash_hmac('md5', $data, $key);
 
        }
 
 
 
        // The following borrowed from
 
        // http://php.net/manual/en/function.mhash.php#27225
 
 
 
        // RFC 2104 HMAC implementation for php.
 
        // Creates an md5 HMAC.
 
        // Eliminates the need to install mhash to compute a HMAC
 
        // by Lance Rushing
 
 
 
        $bytelen = 64; // byte length for md5
 
        if (strlen($key) > $bytelen) {
 
            $key = pack('H*', md5($key));
 
        }
 
        $key = str_pad($key, $bytelen, chr(0x00));
 
        $ipad = str_pad('', $bytelen, chr(0x36));
 
        $opad = str_pad('', $bytelen, chr(0x5c));
 
        $k_ipad = $key ^ $ipad;
 
        $k_opad = $key ^ $opad;
 
 
 
        return md5($k_opad . pack('H*', md5($k_ipad . $data)));
 
    }
 
 
 
    /**
 
     * Check connection state.
 
     * @access public
 
     * @return boolean True if connected.
 
     */
 
    public function connected()
 
    {
 
        if (is_resource($this->smtp_conn)) {
 
            $sock_status = stream_get_meta_data($this->smtp_conn);
 
            if ($sock_status['eof']) {
 
                // The socket is valid but we are not connected
 
                $this->edebug(
 
                    'SMTP NOTICE: EOF caught while checking if connected',
 
                    self::DEBUG_CLIENT
 
                );
 
                $this->close();
 
                return false;
 
            }
 
            return true; // everything looks good
 
        }
 
        return false;
 
    }
 
 
 
    /**
 
     * Close the socket and clean up the state of the class.
 
     * Don't use this function without first trying to use QUIT.
 
     * @see quit()
 
     * @access public
 
     * @return void
 
     */
 
    public function close()
 
    {
 
        $this->setError('');
 
        $this->server_caps = null;
 
        $this->helo_rply = null;
 
        if (is_resource($this->smtp_conn)) {
 
            // close the connection and cleanup
 
            fclose($this->smtp_conn);
 
            $this->smtp_conn = null; //Makes for cleaner serialization
 
            $this->edebug('Connection: closed', self::DEBUG_CONNECTION);
 
        }
 
    }
 
 
 
    /**
 
     * Send an SMTP DATA command.
 
     * Issues a data command and sends the msg_data to the server,
 
     * finializing the mail transaction. $msg_data is the message
 
     * that is to be send with the headers. Each header needs to be
 
     * on a single line followed by a <CRLF> with the message headers
 
     * and the message body being separated by and additional <CRLF>.
 
     * Implements rfc 821: DATA <CRLF>
 
     * @param string $msg_data Message data to send
 
     * @access public
 
     * @return boolean
 
     */
 
    public function data($msg_data)
 
    {
 
        //This will use the standard timelimit
 
        if (!$this->sendCommand('DATA', 'DATA', 354)) {
 
            return false;
 
        }
 
 
 
        /* The server is ready to accept data!
 
         * According to rfc821 we should not send more than 1000 characters on a single line (including the CRLF)
 
         * so we will break the data up into lines by and/or then if needed we will break each of those into
 
         * smaller lines to fit within the limit.
 
         * We will also look for lines that start with a '.' and prepend an additional '.'.
 
         * NOTE: this does not count towards line-length limit.
 
         */
 
 
 
        // Normalize line breaks before exploding
 
        $lines = explode(" ", str_replace(array(" ", " "), " ", $msg_data));
 
 
 
        /* To distinguish between a complete RFC822 message and a plain message body, we check if the first field
 
         * of the first line (':' separated) does not contain a space then it _should_ be a header and we will
 
         * process all lines before a blank line as headers.
 
         */
 
 
 
        $field = substr($lines[0], 0, strpos($lines[0], ':'));
 
        $in_headers = false;
 
        if (!empty($field) && strpos($field, ' ') === false) {
 
            $in_headers = true;
 
        }
 
 
 
        foreach ($lines as $line) {
 
            $lines_out = array();
 
            if ($in_headers and $line == '') {
 
                $in_headers = false;
 
            }
 
            //Break this line up into several smaller lines if it's too long
 
            //Micro-optimisation: isset($str[$len]) is faster than (strlen($str) > $len),
 
            while (isset($line[self::MAX_LINE_LENGTH])) {
 
                //Working backwards, try to find a space within the last MAX_LINE_LENGTH chars of the line to break on
 
                //so as to avoid breaking in the middle of a word
 
                $pos = strrpos(substr($line, 0, self::MAX_LINE_LENGTH), ' ');
 
                //Deliberately matches both false and 0
 
                if (!$pos) {
 
                    //No nice break found, add a hard break
 
                    $pos = self::MAX_LINE_LENGTH - 1;
 
                    $lines_out[] = substr($line, 0, $pos);
 
                    $line = substr($line, $pos);
 
                } else {
 
                    //Break at the found point
 
                    $lines_out[] = substr($line, 0, $pos);
 
                    //Move along by the amount we dealt with
 
                    $line = substr($line, $pos + 1);
 
                }
 
                //If processing headers add a LWSP-char to the front of new line RFC822 section 3.1.1
 
                if ($in_headers) {
 
                    $line = " " . $line;
 
                }
 
            }
 
            $lines_out[] = $line;
 
 
 
            //Send the lines to the server
 
            foreach ($lines_out as $line_out) {
 
                //RFC2821 section 4.5.2
 
                if (!empty($line_out) and $line_out[0] == '.') {
 
                    $line_out = '.' . $line_out;
 
                }
 
                $this->client_send($line_out . self::CRLF);
 
            }
 
        }
 
 
 
        //Message data has been sent, complete the command
 
        //Increase timelimit for end of DATA command
 
        $savetimelimit = $this->Timelimit;
 
        $this->Timelimit = $this->Timelimit * 2;
 
        $result = $this->sendCommand('DATA END', '.', 250);
 
        //Restore timelimit
 
        $this->Timelimit = $savetimelimit;
 
        return $result;
 
    }
 
 
 
    /**
 
     * Send an SMTP HELO or EHLO command.
 
     * Used to identify the sending server to the receiving server.
 
     * This makes sure that client and server are in a known state.
 
     * Implements RFC 821: HELO <SP> <domain> <CRLF>
 
     * and RFC 2821 EHLO.
 

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