/libraries/phpmailer/smtp.php

<?php
class SMTP
{
    public $SMTP_PORT = 25;
    public $CRLF = "\r\n";
    public $do_debug;      
    public $smtp_conn;     
    public $error;         
    public $helo_rply;     

    public function __construct() {
        $this->smtp_conn = 0;
        $this->error = null;
        $this->helo_rply = null;

        $this->do_debug = 0;
    }

    public function Connect($host,$port=0,$tval=30) {
        $this->error = null;

        if($this->connected()) {
            $this->error =
                array("error" => "Already connected to a server");
            return false;
        }

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

        $this->smtp_conn = @fsockopen($host, $port, $errno, $errstr, $tval);  
		        
        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;
        }

        if(substr(PHP_OS, 0, 3) != "WIN")
           socket_set_timeout($this->smtp_conn, $tval, 0);

        $announce = $this->get_lines();

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

        return true;
    }

    public function Authenticate($username, $password) {
        fputs($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;
        }

        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;
        }

        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;
    }

    public function Connected() {
        if(!empty($this->smtp_conn)) {
            $sock_status = socket_get_status($this->smtp_conn);
            if($sock_status["eof"]) {
                if($this->do_debug >= 1) {
                    echo "SMTP -> NOTICE:" . $this->CRLF .
                         "EOF caught while checking if connected";
                }
                $this->Close();
                return false;
            }
            return true;
        }
        return false;
    }

    public function Close() {
        $this->error = null;
        $this->helo_rply = null;
        if(!empty($this->smtp_conn)) {
            fclose($this->smtp_conn);
            $this->smtp_conn = 0;
        }
    }

    public function Data($msg_data) {
        $this->error = null; 

        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;
        }

        $msg_data = str_replace("\r\n","\n",$msg_data);
        $msg_data = str_replace("\r","\n",$msg_data);
        $lines = explode("\n",$msg_data);

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

        $max_line_length = 998; 

        while(list(,$line) = @each($lines)) {
            $lines_out = null;
            if($line == "" && $in_headers) {
                $in_headers = false;
            }

            while(strlen($line) > $max_line_length) {
                $pos = strrpos(substr($line,0,$max_line_length)," ");

                if(!$pos) {
                    $pos = $max_line_length - 1;
                }

                $lines_out[] = substr($line,0,$pos);
                $line = substr($line,$pos + 1);

                if($in_headers) {
                    $line = "\t" . $line;
                }
            }
            $lines_out[] = $line;

            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);
            }
        }

        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:" . $this->CRLF . $rply;
        }

        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;
    }

    public function Expand($name) {
        $this->error = null; 

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

        fputs($this->smtp_conn,"EXPN " . $name . $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 != 250) {
            $this->error =
                array("error" => "EXPN 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;
        }

        $entries = explode($this->CRLF,$rply);
        while(list(,$l) = @each($entries)) {
            $list[] = substr($l,4);
        }

        return $list;
    }

    public function Hello($host="") {
        $this->error = null; 

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

        if(empty($host)) {
            $host = "localhost";
        }

        if(!$this->SendHello("EHLO", $host))
        {
            if(!$this->SendHello("HELO", $host))
                return false;
        }

        return true;
    }

    public 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: " . $this->CRLF . $rply;
        }

        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;
    }

    public function Help($keyword="") {
        $this->error = null;

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

        $extra = "";
        if(!empty($keyword)) {
            $extra = " " . $keyword;
        }

        fputs($this->smtp_conn,"HELP" . $extra . $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 != 211 && $code != 214) {
            $this->error =
                array("error" => "HELP 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 $rply;
    }

    public function Mail($from) {
        $this->error = null; 

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

        fputs($this->smtp_conn,"MAIL FROM:<" . $from . ">" . $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 != 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;
    }

    public function Noop() {
        $this->error = null;

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

        fputs($this->smtp_conn,"NOOP" . $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 != 250) {
            $this->error =
                array("error" => "NOOP 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;
    }

    public function Quit($close_on_error=true) {
        $this->error = null; 

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

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

        $byemsg = $this->get_lines();

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

        $rval = true;
        $e = null;

        $code = substr($byemsg,0,3);
        if($code != 221) {
            $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;
    }

    public function Recipient($to) {
        $this->error = null; 

        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:" . $this->CRLF . $rply;
        }

        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;
    }

    public function Reset() {
        $this->error = null;

        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:" . $this->CRLF . $rply;
        }

        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;
    }

    public function Send($from) {
        $this->error = null; 

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

        fputs($this->smtp_conn,"SEND FROM:" . $from . $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 != 250) {
            $this->error =
                array("error" => "SEND 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;
    }

    public function SendAndMail($from) {
        $this->error = null; 

        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:" . $this->CRLF . $rply;
        }

        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;
    }

    public function SendOrMail($from) {
        $this->error = null; 

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

        fputs($this->smtp_conn,"SOML FROM:" . $from . $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 != 250) {
            $this->error =
                array("error" => "SOML 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;
    }

    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;
    }

    public function Verify($name) {
        $this->error = null;

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

        fputs($this->smtp_conn,"VRFY " . $name . $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 != 250 && $code != 251) {
            $this->error =
                array("error" => "VRFY failed on name '$name'",
                      "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 $rply;
    }

    public 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(substr($str,3,1) == " ") { break; }
        }
        return $data;
    }

}