PHP中class.smtp类

smtp_conn = 0;
        $this->error = null;
        $this->helo_rply = null;

        $this->do_debug = 0;
    }

    /
    // CONNECTION FUNCTIONS
    /

    /**
     * Connect to the server specified on the port specified.
     * If the port is not specified use the default SMTP_PORT.
     * If tval is specified then a connection will try and be
     * established with the server for that number of seconds.
     * If tval is not specified the default is 30 seconds to
     * try on the connection.
     *
     * SMTP CODE SUCCESS: 220
     * SMTP CODE FAILURE: 421
     * @access public
     * @return bool
     */
    public function Connect($host, $port = 0, $tval = 30)
    {
        // set the error val to null so there is no confusion
        $this->error = null;

        // make sure we are __not__ connected
        if ($this->connected()) {
            // already connected, generate error
            $this->error = array("error" => "Already connected to a server");
            return false;
        }

        if (empty($port)) {
            $port = $this->SMTP_PORT;
        }

        // connect to the smtp server
        $this->smtp_conn = @fsockopen($host,    // the host of the server
            $port,    // the port to use
            $errno,   // error number if any
            $errstr,  // error message if any
            $tval);   // give up after ? secs
        // verify we connected properly
        if (empty($this->smtp_conn)) {
            $this->error = array("error" => "Failed to connect to server",
                "errno" => $errno,
                "errstr" => $errstr);
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": $errstr ($errno)" . $this->CRLF . '
';
            }
            return false;
        }

        // 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")
            socket_set_timeout($this->smtp_conn, $tval, 0);

        // get any announcement
        $announce = $this->get_lines();

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $announce . $this->CRLF . '
';
        }

        return true;
    }

    /**
     * Initiate a TLS communication with the server.
     *
     * SMTP CODE 220 Ready to start TLS
     * SMTP CODE 501 Syntax error (no parameters allowed)
     * SMTP CODE 454 TLS not available due to temporary reason
     * @access public
     * @return bool success
     */
    public function StartTLS()
    {
        $this->error = null; # to avoid confusion

        if (!$this->connected()) {
            $this->error = array("error" => "Called StartTLS() without being connected");
            return false;
        }

        fputs($this->smtp_conn, "STARTTLS" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $rply . $this->CRLF . '
';
        }

        if ($code != 220) {
            $this->error =
                array("error" => "STARTTLS not accepted from server",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }

        // Begin encrypted connection
        if (!stream_socket_enable_crypto($this->smtp_conn, true, STREAM_CRYPTO_METHOD_TLS_CLIENT)) {
            return false;
        }

        return true;
    }

    /**
     * Performs SMTP authentication.  Must be run after running the
     * Hello() method.  Returns true if successfully authenticated.
     * @access public
     * @return bool
     */
    public function Authenticate($username, $password)
    {
        // Start authentication
        fputs($this->smtp_conn, "AUTH LOGIN" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($code != 334) {
            $this->error =
                array("error" => "AUTH not accepted from server",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }

        // Send encoded username
        fputs($this->smtp_conn, base64_encode($username) . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($code != 334) {
            $this->error =
                array("error" => "Username not accepted from server",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }

        // Send encoded password
        fputs($this->smtp_conn, base64_encode($password) . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($code != 235) {
            $this->error =
                array("error" => "Password not accepted from server",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }

        return true;
    }

    /**
     * Returns true if connected to a server otherwise false
     * @access public
     * @return bool
     */
    public function Connected()
    {
        if (!empty($this->smtp_conn)) {
            $sock_status = socket_get_status($this->smtp_conn);
            if ($sock_status["eof"]) {
                // the socket is valid but we are not connected
                if ($this->do_debug >= 1) {
                    echo "SMTP -> NOTICE:" . $this->CRLF . "EOF caught while checking if connected";
                }
                $this->Close();
                return false;
            }
            return true; // everything looks good
        }
        return false;
    }

    /**
     * Closes the socket and cleans up the state of the class.
     * It is not considered good to use this function without
     * first trying to use QUIT.
     * @access public
     * @return void
     */
    public function Close()
    {
        $this->error = null; // so there is no confusion
        $this->helo_rply = null;
        if (!empty($this->smtp_conn)) {
            // close the connection and cleanup
            fclose($this->smtp_conn);
            $this->smtp_conn = 0;
        }
    }

    /
    // SMTP COMMANDS
    /

    /**
     * Issues a data command and sends the msg_data to the server
     * finializing the mail transaction. $msg_data is the message
     * that is to be send with the headers. Each header needs to be
     * on a single line followed by a  with the message headers
     * and the message body being seperated by and additional .
     *
     * Implements rfc 821: DATA 
     *
     * SMTP CODE INTERMEDIATE: 354
     *     [data]
     *     .
     *     SMTP CODE SUCCESS: 250
     *     SMTP CODE FAILURE: 552,554,451,452
     * SMTP CODE FAILURE: 451,554
     * SMTP CODE ERROR  : 500,501,503,421
     * @access public
     * @return bool
     */
    public function Data($msg_data)
    {
        $this->error = null; // so no confusion is caused

        if (!$this->connected()) {
            $this->error = array(
                "error" => "Called Data() without being connected");
            return false;
        }

        fputs($this->smtp_conn, "DATA" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $rply . $this->CRLF . '
';
        }

        if ($code != 354) {
            $this->error =
                array("error" => "DATA command not accepted from server",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }

        /* the server is ready to accept data!
         * according to rfc 821 we should not send more than 1000
         * including the CRLF
         * characters on a single line so we will break the data up
         * into lines by \r and/or \n then if needed we will break
         * each of those into smaller lines to fit within the limit.
         * in addition we will be looking for lines that start with
         * a period '.' and append and additional period '.' to that
         * line. NOTE: this does not count towards limit.
         */

        // normalize the line breaks so we know the explode works
        $msg_data = str_replace("\r\n", "\n", $msg_data);
        $msg_data = str_replace("\r", "\n", $msg_data);
        $lines = explode("\n", $msg_data);

        /* we need to find a good way to determine is headers are
         * in the msg_data or if it is a straight msg body
         * currently I am assuming rfc 822 definitions of msg headers
         * and if the first field of the first line (':' sperated)
         * does not contain a space then it _should_ be a header
         * and we can process all lines before a blank "" line as
         * headers.
         */

        $field = substr($lines[0], 0, strpos($lines[0], ":"));
        $in_headers = false;
        if (!empty($field) && !strstr($field, " ")) {
            $in_headers = true;
        }

        $max_line_length = 998; // used below; set here for ease in change

        while (list(, $line) = @each($lines)) {
            $lines_out = null;
            if ($line == "" && $in_headers) {
                $in_headers = false;
            }
            // ok we need to break this line up into several smaller lines
            while (strlen($line) > $max_line_length) {
                $pos = strrpos(substr($line, 0, $max_line_length), " ");

                // Patch to fix DOS attack
                if (!$pos) {
                    $pos = $max_line_length - 1;
                    $lines_out[] = substr($line, 0, $pos);
                    $line = substr($line, $pos);
                } else {
                    $lines_out[] = substr($line, 0, $pos);
                    $line = substr($line, $pos + 1);
                }

                /* if processing headers add a LWSP-char to the front of new line
                 * rfc 822 on long msg headers
                 */
                if ($in_headers) {
                    $line = "\t" . $line;
                }
            }
            $lines_out[] = $line;

            // send the lines to the server
            while (list(, $line_out) = @each($lines_out)) {
                if (strlen($line_out) > 0) {
                    if (substr($line_out, 0, 1) == ".") {
                        $line_out = "." . $line_out;
                    }
                }
                fputs($this->smtp_conn, $line_out . $this->CRLF);
            }
        }

        // message data has been sent
        fputs($this->smtp_conn, $this->CRLF . "." . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $rply . $this->CRLF . '
';
        }

        if ($code != 250) {
            $this->error =
                array("error" => "DATA not accepted from server",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }
        return true;
    }

    /**
     * Sends the HELO command to the smtp server.
     * This makes sure that we and the server are in
     * the same known state.
     *
     * Implements from rfc 821: HELO   
     *
     * SMTP CODE SUCCESS: 250
     * SMTP CODE ERROR  : 500, 501, 504, 421
     * @access public
     * @return bool
     */
    public function Hello($host = '')
    {
        $this->error = null; // so no confusion is caused

        if (!$this->connected()) {
            $this->error = array(
                "error" => "Called Hello() without being connected");
            return false;
        }

        // if hostname for HELO was not specified send default
        if (empty($host)) {
            // determine appropriate default to send to server
            $host = "localhost";
        }

        // Send extended hello first (RFC 2821)
        if (!$this->SendHello("EHLO", $host)) {
            if (!$this->SendHello("HELO", $host)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Sends a HELO/EHLO command.
     * @access private
     * @return bool
     */
    private function SendHello($hello, $host)
    {
        fputs($this->smtp_conn, $hello . " " . $host . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER: " . $rply . $this->CRLF . '
';
        }

        if ($code != 250) {
            $this->error =
                array("error" => $hello . " not accepted from server",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }

        $this->helo_rply = $rply;

        return true;
    }

    /**
     * Starts a mail transaction from the email address specified in
     * $from. Returns true if successful or false otherwise. If True
     * the mail transaction is started and then one or more Recipient
     * commands may be called followed by a Data command.
     *
     * Implements rfc 821: MAIL  FROM: 
     *
     * SMTP CODE SUCCESS: 250
     * SMTP CODE SUCCESS: 552,451,452
     * SMTP CODE SUCCESS: 500,501,421
     * @access public
     * @return bool
     */
    public function Mail($from)
    {
        $this->error = null; // so no confusion is caused

        if (!$this->connected()) {
            $this->error = array(
                "error" => "Called Mail() without being connected");
            return false;
        }

        $useVerp = ($this->do_verp ? "XVERP" : "");
        fputs($this->smtp_conn, "MAIL FROM:<" . $from . ">" . $useVerp . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $rply . $this->CRLF . '
';
        }

        if ($code != 250) {
            $this->error =
                array("error" => "MAIL not accepted from server",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }
        return true;
    }

    /**
     * Sends the quit command to the server and then closes the socket
     * if there is no error or the $close_on_error argument is true.
     *
     * Implements from rfc 821: QUIT 
     *
     * SMTP CODE SUCCESS: 221
     * SMTP CODE ERROR  : 500
     * @access public
     * @return bool
     */
    public function Quit($close_on_error = true)
    {
        $this->error = null; // so there is no confusion

        if (!$this->connected()) {
            $this->error = array(
                "error" => "Called Quit() without being connected");
            return false;
        }

        // send the quit command to the server
        fputs($this->smtp_conn, "quit" . $this->CRLF);

        // get any good-bye messages
        $byemsg = $this->get_lines();

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $byemsg . $this->CRLF . '
';
        }

        $rval = true;
        $e = null;

        $code = substr($byemsg, 0, 3);
        if ($code != 221) {
            // use e as a tmp var cause Close will overwrite $this->error
            $e = array("error" => "SMTP server rejected quit command",
                "smtp_code" => $code,
                "smtp_rply" => substr($byemsg, 4));
            $rval = false;
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $e["error"] . ": " . $byemsg . $this->CRLF . '
';
            }
        }

        if (empty($e) || $close_on_error) {
            $this->Close();
        }

        return $rval;
    }

    /**
     * Sends the command RCPT to the SMTP server with the TO: argument of $to.
     * Returns true if the recipient was accepted false if it was rejected.
     *
     * Implements from rfc 821: RCPT  TO: 
     *
     * SMTP CODE SUCCESS: 250,251
     * SMTP CODE FAILURE: 550,551,552,553,450,451,452
     * SMTP CODE ERROR  : 500,501,503,421
     * @access public
     * @return bool
     */
    public function Recipient($to)
    {
        $this->error = null; // so no confusion is caused

        if (!$this->connected()) {
            $this->error = array(
                "error" => "Called Recipient() without being connected");
            return false;
        }

        fputs($this->smtp_conn, "RCPT TO:<" . $to . ">" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $rply . $this->CRLF . '
';
        }

        if ($code != 250 && $code != 251) {
            $this->error =
                array("error" => "RCPT not accepted from server",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }
        return true;
    }

    /**
     * Sends the RSET command to abort and transaction that is
     * currently in progress. Returns true if successful false
     * otherwise.
     *
     * Implements rfc 821: RSET 
     *
     * SMTP CODE SUCCESS: 250
     * SMTP CODE ERROR  : 500,501,504,421
     * @access public
     * @return bool
     */
    public function Reset()
    {
        $this->error = null; // so no confusion is caused

        if (!$this->connected()) {
            $this->error = array(
                "error" => "Called Reset() without being connected");
            return false;
        }

        fputs($this->smtp_conn, "RSET" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $rply . $this->CRLF . '
';
        }

        if ($code != 250) {
            $this->error =
                array("error" => "RSET failed",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }

        return true;
    }

    /**
     * Starts a mail transaction from the email address specified in
     * $from. Returns true if successful or false otherwise. If True
     * the mail transaction is started and then one or more Recipient
     * commands may be called followed by a Data command. This command
     * will send the message to the users terminal if they are logged
     * in and send them an email.
     *
     * Implements rfc 821: SAML  FROM: 
     *
     * SMTP CODE SUCCESS: 250
     * SMTP CODE SUCCESS: 552,451,452
     * SMTP CODE SUCCESS: 500,501,502,421
     * @access public
     * @return bool
     */
    public function SendAndMail($from)
    {
        $this->error = null; // so no confusion is caused

        if (!$this->connected()) {
            $this->error = array(
                "error" => "Called SendAndMail() without being connected");
            return false;
        }

        fputs($this->smtp_conn, "SAML FROM:" . $from . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $rply . $this->CRLF . '
';
        }

        if ($code != 250) {
            $this->error =
                array("error" => "SAML not accepted from server",
                    "smtp_code" => $code,
                    "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] . ": " . $rply . $this->CRLF . '
';
            }
            return false;
        }
        return true;
    }

    /**
     * This is an optional command for SMTP that this class does not
     * support. This method is here to make the RFC821 Definition
     * complete for this class and __may__ be implimented in the future
     *
     * Implements from rfc 821: TURN 
     *
     * SMTP CODE SUCCESS: 250
     * SMTP CODE FAILURE: 502
     * SMTP CODE ERROR  : 500, 503
     * @access public
     * @return bool
     */
    public function Turn()
    {
        $this->error = array("error" => "This method, TURN, of the SMTP " .
            "is not implemented");
        if ($this->do_debug >= 1) {
            echo "SMTP -> NOTICE: " . $this->error["error"] . $this->CRLF . '
';
        }
        return false;
    }

    /**
     * Get the current error
     * @access public
     * @return array
     */
    public function getError()
    {
        return $this->error;
    }

    /
    // INTERNAL FUNCTIONS
    /

    /**
     * Read in as many lines as possible
     * either before eof or socket timeout occurs on the operation.
     * With SMTP we can tell if we have more lines to read if the
     * 4th character is '-' symbol. If it is a space then we don't
     * need to read anything else.
     * @access private
     * @return string
     */
    private function get_lines()
    {
        $data = "";
        while ($str = @fgets($this->smtp_conn, 515)) {
            if ($this->do_debug >= 4) {
                echo "SMTP -> get_lines(): \$data was \"$data\"" . $this->CRLF . '
';
                echo "SMTP -> get_lines(): \$str is \"$str\"" . $this->CRLF . '
';
            }
            $data .= $str;
            if ($this->do_debug >= 4) {
                echo "SMTP -> get_lines(): \$data is \"$data\"" . $this->CRLF . '
';
            }
            // if 4th character is a space, we are done reading, break the loop
            if (substr($str, 3, 1) == " ") {
                break;
            }
        }
        return $data;
    }

}

?>