<?php
/**
* PHPMailer POP-Before-SMTP Authentication Class.
* PHP Version 5.5.
*
* @see https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
*
* @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
* @author Jim Jagielski (jimjag) <jimjag@gmail.com>
* @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
* @author Brent R. Matzelle (original founder)
* @copyright 2012 - 2020 Marcus Bointon
* @copyright 2010 - 2012 Jim Jagielski
* @copyright 2004 - 2009 Andy Prevost
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
* @note 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.
*/
namespace PHPMailer\PHPMailer;
/**
* PHPMailer POP-Before-SMTP Authentication Class.
* Specifically for PHPMailer to use for RFC1939 POP-before-SMTP authentication.
* 1) This class does not support APOP authentication.
* 2) Opening and closing lots of POP3 connections can be quite slow. If you need
* to send a batch of emails then just perform the authentication once at the start,
* and then loop through your mail sending script. Providing this process doesn't
* take longer than the verification period lasts on your POP3 server, you should be fine.
* 3) This is really ancient technology; you should only need to use it to talk to very old systems.
* 4) This POP3 class is deliberately lightweight and incomplete, implementing just
* enough to do authentication.
* If you want a more complete class there are other POP3 classes for PHP available.
*
* @author Richard Davey (original author) <rich@corephp.co.uk>
* @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
* @author Jim Jagielski (jimjag) <jimjag@gmail.com>
* @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
*/
class POP3
{
const VERSION = '6.6.4';
const DEFAULT_PORT = 110;
const DEFAULT_TIMEOUT = 30;
public $do_debug = self::DEBUG_OFF;
public $host;
public $port;
public $tval;
public $username;
public $password;
protected $pop_conn;
protected $connected = false;
protected $errors = [];
const LE = "\r\n";
const DEBUG_OFF = 0;
const DEBUG_SERVER = 1;
const DEBUG_CLIENT = 2;
public static function popBeforeSmtp(
$host,
$port = false,
$timeout = false,
$username = '',
$password = '',
$debug_level = 0
) {
$pop = new self();
return $pop->authorise($host, $port, $timeout, $username, $password, $debug_level);
}
public function authorise($host, $port = false, $timeout = false, $username = '', $password = '', $debug_level = 0)
{
$this->host = $host;
if (false === $port) {
$this->port = static::DEFAULT_PORT;
} else {
$this->port = (int) $port;
}
if (false === $timeout) {
$this->tval = static::DEFAULT_TIMEOUT;
} else {
$this->tval = (int) $timeout;
}
$this->do_debug = $debug_level;
$this->username = $username;
$this->password = $password;
$this->errors = [];
$result = $this->connect($this->host, $this->port, $this->tval);
if ($result) {
$login_result = $this->login($this->username, $this->password);
if ($login_result) {
$this->disconnect();
return true;
}
}
$this->disconnect();
return false;
}
public function connect($host, $port = false, $tval = 30)
{
if ($this->connected) {
return true;
}
set_error_handler([$this, 'catchWarning']);
if (false === $port) {
$port = static::DEFAULT_PORT;
}
$errno = 0;
$errstr = '';
$this->pop_conn = fsockopen(
$host, $port, $errno, $errstr, $tval
); restore_error_handler();
if (false === $this->pop_conn) {
$this->setError(
"Failed to connect to server $host on port $port. errno: $errno; errstr: $errstr"
);
return false;
}
stream_set_timeout($this->pop_conn, $tval, 0);
$pop3_response = $this->getResponse();
if ($this->checkResponse($pop3_response)) {
$this->connected = true;
return true;
}
return false;
}
public function login($username = '', $password = '')
{
if (!$this->connected) {
$this->setError('Not connected to POP3 server');
return false;
}
if (empty($username)) {
$username = $this->username;
}
if (empty($password)) {
$password = $this->password;
}
$this->sendString("USER $username" . static::LE);
$pop3_response = $this->getResponse();
if ($this->checkResponse($pop3_response)) {
$this->sendString("PASS $password" . static::LE);
$pop3_response = $this->getResponse();
if ($this->checkResponse($pop3_response)) {
return true;
}
}
return false;
}
public function disconnect()
{
$this->sendString('QUIT');
try {
$this->getResponse();
} catch (Exception $e) {
}
try {
@fclose($this->pop_conn);
} catch (Exception $e) {
}
$this->connected = false;
$this->pop_conn = false;
}
protected function getResponse($size = 128)
{
$response = fgets($this->pop_conn, $size);
if ($this->do_debug >= self::DEBUG_SERVER) {
echo 'Server -> Client: ', $response;
}
return $response;
}
protected function sendString($string)
{
if ($this->pop_conn) {
if ($this->do_debug >= self::DEBUG_CLIENT) { echo 'Client -> Server: ', $string;
}
return fwrite($this->pop_conn, $string, strlen($string));
}
return 0;
}
protected function checkResponse($string)
{
if (strpos($string, '+OK') !== 0) {
$this->setError("Server reported an error: $string");
return false;
}
return true;
}
protected function setError($error)
{
$this->errors[] = $error;
if ($this->do_debug >= self::DEBUG_SERVER) {
echo '<pre>';
foreach ($this->errors as $e) {
print_r($e);
}
echo '</pre>';
}
}
public function getErrors()
{
return $this->errors;
}
protected function catchWarning($errno, $errstr, $errfile, $errline)
{
$this->setError(
'Connecting to the POP3 server raised a PHP warning:' .
"errno: $errno errstr: $errstr; errfile: $errfile; errline: $errline"
);
}
}