class.smtp.php

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<?php
    /*
     * File: smtp.php
     *
     * Description: Define an SMTP class that can be used to connect
     *              and communicate with any SMTP server. It implements
     *              all the SMTP functions defined in RFC821 except TURN.
     *
     * Creator: Chris Ryan <[e-mail]>
     * Created: 03/26/2001
     *
     * TODO:
     *     - Move all the duplicate code to a utility function
     *           Most of the functions have the first lines of
     *           code do the same processing. If this can be moved
     *           into a utility function then it would reduce the
     *           overall size of the code significantly.
     */

    /*
     * STMP 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.
     */
    class SMTP {
        var $SMTP_PORT = 25; # the default SMTP PORT
        var $CRLF = "\r\n";  # CRLF pair

        var $smtp_conn;      # the socket to the server
        var $error;          # error if any on the last call
		var $code_error;     # CODE ERROR RECEIVED SMTP PROTOCOL
        var $helo_rply;      # the reply the server sent to us for HELO

        var $do_debug=0;       # the level of debug to perform

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

            $this->do_debug = 0;
        }

        /************************************************************
         *                    CONNECTION FUNCTIONS                  *
         ***********************************************************/

        /*
         * Connect($host, $port=0, $tval=30)
         *
         * Connect to the server specified on the port specified.
         * If the port is not specified use the default SMTP_PORT.
         * If tval is specified then a connection will try and be
         * established with the server for that number of seconds.
         * If tval is not specified the default is 30 seconds to
         * try on the connection.
         *
         * SMTP CODE SUCCESS: 220
         * SMTP CODE FAILURE: 421
         */
        function Connect($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()) {
                # ok we are connected! what should we do?
                # for now we will just give an error saying we
                # are already connected
                $this->error =
                    array("error" => "Already connected to a server");
                return false;
            }

            if(empty($port)) {
                $port = $this->SMTP_PORT;
            }
			$errno= $errstr ='';
            #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;
            }

            # sometimes the SMTP server takes a little longer to respond
            # so we will give it a longer timeout for the first read
            // Commented b/c of win32 warning messages
            //if(function_exists("socket_set_timeout"))
            //   socket_set_timeout($this->smtp_conn, 1, 0);

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

            # set the timeout  of any socket functions at 1/10 of a second
            //if(function_exists("socket_set_timeout"))
            //   socket_set_timeout($this->smtp_conn, 0, 100000);

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

            return true;
        }

        /*
         * Authenticate()
         *
         * Performs SMTP authentication.  Must be run after running the
         * Hello() method.  Returns true if successfully authenticated.
         */
        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;
        }

        /*
         * Connected()
         *
         * Returns true if connected to a server otherwise false
         */
        function Connected() {
            if(!empty($this->smtp_conn)) {
                $sock_status = socket_get_status($this->smtp_conn);
                if($sock_status["eof"]) {
                    # hmm this is an odd situation... the socket is
                    # valid but we aren't connected anymore
                    if($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;
        }

        /*
         * Close()
         *
         * 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.
         */
        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                       *
         *************************************************************/

        /*
         * Data($msg_data)
         *
         * Issues a data command and sends the msg_data to the server
         * finializing the mail transaction. $msg_data is the message
         * that is to be send with the headers. Each header needs to be
         * on a single line followed by a <CRLF> with the message headers
         * and the message body being seperated by and additional <CRLF>.
         *
         * Implements rfc 821: DATA <CRLF>
         *
         * SMTP CODE INTERMEDIATE: 354
         *     [data]
         *     <CRLF>.<CRLF>
         *     SMTP CODE SUCCESS: 250
         *     SMTP CODE FAILURE: 552,554,451,452
         * SMTP CODE FAILURE: 451,554
         * SMTP CODE ERROR  : 500,501,503,421
         */
        function Data($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:" . $this->CRLF . $rply;
            }

            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 are 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'm 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)," ");
                    $lines_out[] = substr($line,0,$pos);
                    $line = substr($line,$pos + 1);
                    # if we are processing headers we need to
                    # add a LWSP-char to the front of the new line
                    # rfc 822 on long msg headers
                    if($in_headers) {
                        $line = "\t" . $line;
                    }
                }
                $lines_out[] = $line;

                # now send the lines to the server
                while(list(,$line_out) = @each($lines_out)) {
                    if($line_out[0] == ".") {
                        $line_out = "." . $line_out;
                    }
                    fputs($this->smtp_conn,$line_out . $this->CRLF);
                }
            }