lmtp.php

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     *                  supported authentication method or a PEAR_Error object
     *                  if a failure condition is encountered.
     * @access private
     * @since  1.0
     */
    function _getBestAuthMethod()
    {
        $available_methods = explode(' ', $this->_esmtp['AUTH']);

        foreach ($this->supportedAuthMethods as $method) {
            if (in_array($method, $available_methods)) {
                return $method;
            }
        }

        return new PEAR_Error('No supported authentication methods');
    }

    /**
     * Attempt to do LMTP authentication.
     *
     * @param string The userid to authenticate as.
     * @param string The password to authenticate with.
     * @param string The requested authentication method.  If none is
     *               specified, the best supported method will be used.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access public
     * @since  1.0
     */
    function auth($uid, $pwd , $method = '')
    {
        if (!array_key_exists('AUTH', $this->_esmtp)) {
            return new PEAR_Error('LMTP server does no support authentication');
        }

        /*
         * If no method has been specified, get the name of the best supported
         * method advertised by the LMTP server.
         */
        if (empty($method) || $method === true ) {
            if (PEAR::isError($method = $this->_getBestAuthMethod())) {
                /* Return the PEAR_Error object from _getBestAuthMethod(). */
                return $method;
            } 
        } else {
            $method = strtoupper($method);
        }

        switch ($method) {
            case 'DIGEST-MD5':
                $result = $this->_authDigest_MD5($uid, $pwd);
                break;
            case 'CRAM-MD5':
                $result = $this->_authCRAM_MD5($uid, $pwd);
                break;
            case 'LOGIN':
                $result = $this->_authLogin($uid, $pwd);
                break;
            case 'PLAIN':
                $result = $this->_authPlain($uid, $pwd);
                break;
            default : 
                $result = new PEAR_Error("$method is not a supported authentication method");
                break;
        }

        /* If an error was encountered, return the PEAR_Error object. */
        if (PEAR::isError($result)) {
            return $result;
        }

        /* RFC-2554 requires us to re-negotiate ESMTP after an AUTH. */
        if (PEAR::isError($error = $this->_negotiate())) {
            return $error;
        }

        return true;
    }

    /* Authenticates the user using the DIGEST-MD5 method.
     *
     * @param string The userid to authenticate as.
     * @param string The password to authenticate with.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access private
     * @since  1.0
     */
    function _authDigest_MD5($uid, $pwd)
    {


        if (PEAR::isError($error = $this->_put('AUTH', 'DIGEST-MD5'))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(334))) {
            return $error;
        }

        $challenge = base64_decode($this->_arguments[0]);
        $digest = &Auth_SASL::factory('digestmd5');
        $auth_str = base64_encode($digest->getResponse($uid, $pwd, $challenge,
                                                       $this->_host, "smtp"));

        if (PEAR::isError($error = $this->_put($auth_str ))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(334))) {
            return $error;
        }

        /*
         * We don't use the protocol's third step because LMTP doesn't allow
         * subsequent authentication, so we just silently ignore it.
         */
        if (PEAR::isError($error = $this->_put(' '))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(235))) {
            return $error;
        }
    }

    /* Authenticates the user using the CRAM-MD5 method.
     *
     * @param string The userid to authenticate as.
     * @param string The password to authenticate with.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access private
     * @since  1.0
     */
    function _authCRAM_MD5($uid, $pwd)
    {


        if (PEAR::isError($error = $this->_put('AUTH', 'CRAM-MD5'))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(334))) {
            return $error;
        }

        $challenge = base64_decode($this->_arguments[0]);
        $cram = &Auth_SASL::factory('crammd5');
        $auth_str = base64_encode($cram->getResponse($uid, $pwd, $challenge));

        if (PEAR::isError($error = $this->_put($auth_str))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(235))) {
            return $error;
        }
    }

    /**
     * Authenticates the user using the LOGIN method.
     *
     * @param string The userid to authenticate as.
     * @param string The password to authenticate with.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access private 
     * @since  1.0
     */
    function _authLogin($uid, $pwd)
    {
        if (PEAR::isError($error = $this->_put('AUTH', 'LOGIN'))) { 
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(334))) {
            return $error;
        }

        if (PEAR::isError($error = $this->_put(base64_encode($uid)))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(334))) {
            return $error;
        }

        if (PEAR::isError($error = $this->_put(base64_encode($pwd)))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(235))) {
            return $error;
        }

        return true;
    }

    /**
     * Authenticates the user using the PLAIN method.
     *
     * @param string The userid to authenticate as.
     * @param string The password to authenticate with.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access private 
     * @since  1.0
     */
    function _authPlain($uid, $pwd)
    {
        if (PEAR::isError($error = $this->_put('AUTH', 'PLAIN'))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(334))) {
            return $error;
        }

        $auth_str = base64_encode(chr(0) . $uid . chr(0) . $pwd);

        if (PEAR::isError($error = $this->_put($auth_str))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(235))) {
            return $error;
        }

        return true;
    }

    /**
     * Send the MAIL FROM: command.
     *
     * @param string The sender (reverse path) to set.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access public
     * @since  1.0
     */
    function mailFrom($sender)
    {
        if (PEAR::isError($error = $this->_put('MAIL', "FROM:<$sender>"))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(250))) {
            return $error;
        }

        return true;
    }

    /**
     * Send the RCPT TO: command.
     *
     * @param string The recipient (forward path) to add.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access public
     * @since  1.0
     */
    function rcptTo($recipient)
    {
        if (PEAR::isError($error = $this->_put('RCPT', "TO:<$recipient>"))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(array(250, 251)))) {
            return $error;
        }

        return true;
    }

    /**
     * Send the DATA command.
     *
     * @param string The message body to send.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access public
     * @since  1.0
     */
    function data($data)
    {

        if (isset($this->_esmtp['SIZE']) && ($this->_esmtp['SIZE'] > 0)) {
            if (strlen($data) >= $this->_esmtp['SIZE']) {
                $this->disconnect();
                return new PEAR_Error('Message size excedes the server limit');
            }
        }
    

        /*
         * Change Unix (\n) and Mac (\r) linefeeds into Internet-standard CRLF
         * (\r\n) linefeeds.
         */
        $data = preg_replace("/([^\r]{1})\n/", "\\1\r\n", $data);
        $data = preg_replace("/\n\n/", "\n\r\n", $data);

        /*
         * Because a single leading period (.) signifies an end to the data,
         * legitimate leading periods need to be "doubled" (e.g. '..').
         */
        $data = preg_replace("/\n\./", "\n..", $data);

        if (PEAR::isError($error = $this->_put('DATA'))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(354))) {
            return $error;
        }

        if (PEAR::isError($this->_send($data . "\r\n.\r\n"))) {
            return new PEAR_Error('write to socket failed');
        }
        if (PEAR::isError($error = $this->_parseResponse(250))) {
            return $error;
        }

        return true;
    }

    /**
     * Send the RSET command.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access public
     * @since  1.0
     */
    function rset()
    {
        if (PEAR::isError($error = $this->_put('RSET'))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(250))) {
            return $error;
        }

        return true;
    }
    /**
     * Send the NOOP command.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access public
     * @since  1.0
     */
    function noop()
    {
        if (PEAR::isError($error = $this->_put('NOOP'))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_parseResponse(250))) {
            return $error;
        }

        return true;
    }
}

?>