chamilo-lms2/main/inc/lib/phpmailer/class.smtp.php

<?php
/*~ class.smtp.php
.---------------------------------------------------------------------------.
|  Software: PHPMailer - PHP email class                                    |
|   Version: 5.1                                                            |
|   Contact: via sourceforge.net support pages (also www.codeworxtech.com)  |
|      Info: http://phpmailer.sourceforge.net                               |
|   Support: http://sourceforge.net/projects/phpmailer/                     |
| ------------------------------------------------------------------------- |
|     Admin: Andy Prevost (project admininistrator)                         |
|   Authors: Andy Prevost (codeworxtech) codeworxtech@users.sourceforge.net |
|          : Marcus Bointon (coolbru) coolbru@users.sourceforge.net         |
|   Founder: Brent R. Matzelle (original founder)                           |
| Copyright (c) 2004-2009, Andy Prevost. All Rights Reserved.               |
| Copyright (c) 2001-2003, Brent R. Matzelle                                |
| ------------------------------------------------------------------------- |
|   License: Distributed under the Lesser General Public License (LGPL)     |
|            http://www.gnu.org/copyleft/lesser.html                        |
| 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.                                         |
| ------------------------------------------------------------------------- |
| We offer a number of paid services (www.codeworxtech.com):                |
| - Web Hosting on highly optimized fast and secure servers                 |
| - Technology Consulting                                                   |
| - Oursourcing (highly qualified programmers and graphic designers)        |
'---------------------------------------------------------------------------'
*/

/**
 * PHPMailer - PHP SMTP email transport class
 * NOTE: Designed for use with PHP version 5 and up.
 *
 * @package PHPMailer
 *
 * @author Andy Prevost
 * @author Marcus Bointon
 * @copyright 2004 - 2008 Andy Prevost
 * @license http://www.gnu.org/copyleft/lesser.html Distributed under the Lesser General Public License (LGPL)
 *
 * @version $Id: class.smtp.php 444 2009-05-05 11:22:26Z coolbru $
 */

/**
 * SMTP is rfc 821 compliant and implements all the rfc 821 SMTP
 * commands except TURN which will always return a not implemented
 * error. SMTP also provides some utility methods for sending mail
 * to an SMTP server.
 * original author: Chris Ryan.
 */
class SMTP
{
    /**
     *  SMTP server port.
     *
     *  @var int
     */
    public $SMTP_PORT = 25;

    /**
     *  SMTP reply line ending.
     *
     *  @var string
     */
    public $CRLF = "\r\n";

    /**
     *  Sets whether debugging is turned on.
     *
     *  @var bool
     */
    public $do_debug;       // the level of debug to perform

    /**
     *  Sets VERP use on/off (default is off).
     *
     *  @var bool
     */
    public $do_verp = false;

    /////////////////////////////////////////////////
    // PROPERTIES, PRIVATE AND PROTECTED
    /////////////////////////////////////////////////

    private $smtp_conn; // the socket to the server
  private $error;     // error if any on the last call
  private $helo_rply; // the reply the server sent to us for HELO

    /**
     * Initialize the class so that the data is in a known state.
     */
    public function __construct()
    {
        $this->smtp_conn = 0;
        $this->error = null;
        $this->helo_rply = null;

        $this->do_debug = false;
    }

    /////////////////////////////////////////////////
    // 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
     *
     * @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 = ["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 = ["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.'<br />';
        }

        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.'<br />';
        }

        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
     *
     * @return bool success
     */
    public function StartTLS()
    {
        $this->error = null; // to avoid confusion

        if (!$this->connected()) {
            $this->error = ["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.'<br />';
        }

        if ($code != 220) {
            $this->error =
         ["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.'<br />';
            }

            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.
     *
     * @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 =
        ["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.'<br />';
            }

            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 =
        ["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.'<br />';
            }

            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 =
        ["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.'<br />';
            }

            return false;
        }

        return true;
    }

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

        if (!$this->connected()) {
            $this->error = [
              "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.'<br />';
        }

        if ($code != 354) {
            $this->error =
        ["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.'<br />';
            }

            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.'<br />';
        }

        if ($code != 250) {
            $this->error =
        ["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.'<br />';
            }

            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 <SP> <domain> <CRLF>
     *
     * SMTP CODE SUCCESS: 250
     * SMTP CODE ERROR  : 500, 501, 504, 421
     *
     * @return bool
     */
    public function Hello($host = '')
    {
        $this->error = null; // so no confusion is caused

        if (!$this->connected()) {
            $this->error = [
            "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;
    }

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

        if (!$this->connected()) {
            $this->error = [
              "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.'<br />';
        }

        if ($code != 250) {
            $this->error =
        ["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.'<br />';
            }

            return false;
        }

        return true;
    }

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

        if (!$this->connected()) {
            $this->error = [
              "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.'<br />';
        }

        $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 = ["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.'<br />';
            }
        }

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

        return $rval;
    }

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

        if (!$this->connected()) {
            $this->error = [
              "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.'<br />';
        }

        if ($code != 250 && $code != 251) {
            $this->error =
        ["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.'<br />';
            }

            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 <CRLF>
     *
     * SMTP CODE SUCCESS: 250
     * SMTP CODE ERROR  : 500,501,504,421
     *
     * @return bool
     */
    public function Reset()
    {
        $this->error = null; // so no confusion is caused

        if (!$this->connected()) {
            $this->error = [
              "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.'<br />';
        }

        if ($code != 250) {
            $this->error =
        ["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.'<br />';
            }

            return false;
        }

        return true;
    }

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

        if (!$this->connected()) {
            $this->error = [
          "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.'<br />';
        }

        if ($code != 250) {
            $this->error =
        ["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.'<br />';
            }

            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 <CRLF>
     *
     * SMTP CODE SUCCESS: 250
     * SMTP CODE FAILURE: 502
     * SMTP CODE ERROR  : 500, 503
     *
     * @return bool
     */
    public function Turn()
    {
        $this->error = ["error" => "This method, TURN, of the SMTP ".
                                    "is not implemented", ];
        if ($this->do_debug >= 1) {
            echo "SMTP -> NOTICE: ".$this->error["error"].$this->CRLF.'<br />';
        }

        return false;
    }

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

    /**
     * Sends a HELO/EHLO command.
     *
     * @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.'<br />';
        }

        if ($code != 250) {
            $this->error =
        ["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.'<br />';
            }

            return false;
        }

        $this->helo_rply = $rply;

        return true;
    }

    /////////////////////////////////////////////////
    // 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.
     *
     * @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.'<br />';
                echo "SMTP -> get_lines(): \$str is \"$str\"".$this->CRLF.'<br />';
            }
            $data .= $str;
            if ($this->do_debug >= 4) {
                echo "SMTP -> get_lines(): \$data is \"$data\"".$this->CRLF.'<br />';
            }
            // if 4th character is a space, we are done reading, break the loop
            if (substr($str, 3, 1) == " ") {
                break;
            }
        }

        return $data;
    }
}