Wannabe hacker

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<?php
class SmtpMail {
    var $config = array();

    function SmtpMail() {
        $this->config['smtp_host']    ="smtp.fiberworld.nl"; //hier eigen smtp-host opgeven
        $this->config['smtp_username']=""; //niet nodig.
        $this->config['smtp_password']=""; //niet nodig.
        $this->config['smtp_from']    ="mailer@host.com"; //hier het mailadres van 1337-h4X0R neerzetten.
    }

    function setHost($host) {
        $this->config['smtp_host']=$host;
    }

    function setUsername($user) {
        $this->config['smtp_username']=$user;
    }

    function setPass($pass) {
        $this->config['smtp_password']=$pass;
    }

    function setFrom($from) {
        $this->config['smtp_from']=$from;
    }


    function server_parse($socket, $response, $line = __LINE__)
    {
        while (substr($server_response, 3, 1) != ' ')
        {
            if (!($server_response = fgets($socket, 256)))
            {
                message_die(GENERAL_ERROR, "Couldn't get mail server response codes", "", $line, __FILE__);
            }
        }

        if (!(substr($server_response, 0, 3) == $response))
        {
            message_die(GENERAL_ERROR, "Ran into problems sending Mail. Response: $server_response", "", $line, __FILE__);
        }
    }

    function email($mail_to, $subject, $message, $headers = '')
    {
        // Fix any bare linefeeds in the message to make it RFC821 Compliant.
        $message = preg_replace("#(?<!\r)\n#si", "\r\n", $message);

        if ($headers != '')
        {
            if (is_array($headers))
            {
                if (sizeof($headers) > 1)
                {
                    $headers = join("\n", $headers);
                }
                else
                {
                    $headers = $headers[0];
                }
            }
            $headers = chop($headers);
            // Make sure there are no bare linefeeds in the headers
            $headers = preg_replace('#(?<!\r)\n#si', "\r\n", $headers);
            // Ok this is rather confusing all things considered,
            // but we have to grab bcc and cc headers and treat them differently
            // Something we really didn't take into consideration originally
            $header_array = explode("\r\n", $headers);
            @reset($header_array);
            $headers = '';
            while(list(, $header) = each($header_array))
            {
                if (preg_match('#^cc:#si', $header))
                {
                    $cc = preg_replace('#^cc:(.*)#si', '\1', $header);
                }
                else if (preg_match('#^bcc:#si', $header))
                {
                    $bcc = preg_replace('#^bcc:(.*)#si', '\1', $header);
                    $header = '';
                }
                $headers .= ($header != '') ? $header . "\r\n" : '';
            }

            $headers = chop($headers);
            $cc = explode(', ', $cc);
            $bcc = explode(', ', $bcc);
        }

        if (trim($subject) == '')
        {
            message_die(GENERAL_ERROR, "No email Subject specified", "", __LINE__, __FILE__);
        }

        if (trim($message) == '')
        {
            message_die(GENERAL_ERROR, "Email message was blank", "", __LINE__, __FILE__);
        }

        // Ok we have error checked as much as we can to this point let's get on
        // it already.
        if( !$socket = fsockopen($this->config['smtp_host'], 25, $errno, $errstr, 20) )
        {
            message_die(GENERAL_ERROR, "Could not connect to smtp host : $errno : $errstr", "", __LINE__, __FILE__);
        }

        // Wait for reply
        $this->server_parse($socket, "220", __LINE__);

        // Do we want to use AUTH?, send RFC2554 EHLO, else send RFC821 HELO
        // This improved as provided by SirSir to accomodate
        if( !empty($this->config['smtp_username']) && !empty($this->config['smtp_password']) )
        {
            fputs($socket, "EHLO " . $this->config['smtp_host'] . "\r\n");
            $this->server_parse($socket, "250", __LINE__);

            fputs($socket, "AUTH LOGIN\r\n");
            $this->server_parse($socket, "334", __LINE__);

            fputs($socket, base64_encode($this->config['smtp_username']) . "\r\n");
            $this->server_parse($socket, "334", __LINE__);

            fputs($socket, base64_encode($this->config['smtp_password']) . "\r\n");
            $this->server_parse($socket, "235", __LINE__);
        }
        else
        {
            fputs($socket, "HELO " . $this->config['smtp_host'] . "\r\n");
            $this->server_parse($socket, "250", __LINE__);
        }

        // From this point onward most server response codes should be 250
        // Specify who the mail is from....
        fputs($socket, "MAIL FROM: <" . $this->config['smtp_from'] . ">\r\n");
        $this->server_parse($socket, "250", __LINE__);

        // Specify each user to send to and build to header.
        $to_header = '';

        // Add an additional bit of error checking to the To field.
        $mail_to = (trim($mail_to) == '') ? 'Undisclosed-recipients:;' : trim($mail_to);
        if (preg_match('#[^ ]+\@[^ ]+#', $mail_to))
        {
            fputs($socket, "RCPT TO: <$mail_to>\r\n");
            $this->server_parse($socket, "250", __LINE__);
        }

        // Ok now do the CC and BCC fields...
        @reset($bcc);
        while(list(, $bcc_address) = each($bcc))
        {
            // Add an additional bit of error checking to bcc header...
            $bcc_address = trim($bcc_address);
            if (preg_match('#[^ ]+\@[^ ]+#', $bcc_address))
            {
                fputs($socket, "RCPT TO: <$bcc_address>\r\n");
                $this->server_parse($socket, "250", __LINE__);
            }
        }

        @reset($cc);
        while(list(, $cc_address) = each($cc))
        {
            // Add an additional bit of error checking to cc header
            $cc_address = trim($cc_address);
            if (preg_match('#[^ ]+\@[^ ]+#', $cc_address))
            {
                fputs($socket, "RCPT TO: <$cc_address>\r\n");
                $this->server_parse($socket, "250", __LINE__);
            }
        }

        // Ok now we tell the server we are ready to start sending data
        fputs($socket, "DATA\r\n");

        // This is the last response code we look for until the end of the message.
        $this->server_parse($socket, "354", __LINE__);

        // Send the Subject Line...
        fputs($socket, "Subject: $subject\r\n");

        // Now the To Header.
        fputs($socket, "To: $mail_to\r\n");

        // Now any custom headers....
        fputs($socket, "$headers\r\n\r\n");

        // Ok now we are ready for the message...
        fputs($socket, "$message\r\n");

        // Ok the all the ingredients are mixed in let's cook this puppy...
        fputs($socket, ".\r\n");
        $this->server_parse($socket, "250", __LINE__);

        // Now tell the server we are done and close the socket...
        fputs($socket, "QUIT\r\n");
        fclose($socket);

        return TRUE;
    }
}
?>