468 lines
12 KiB
PHP
468 lines
12 KiB
PHP
<?php
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/**
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* PHPMailer POP-Before-SMTP Authentication Class.
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* PHP Version 5.5.
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*
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* @see https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
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*
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* @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
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* @author Jim Jagielski (jimjag) <jimjag@gmail.com>
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* @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
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* @author Brent R. Matzelle (original founder)
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* @copyright 2012 - 2020 Marcus Bointon
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* @copyright 2010 - 2012 Jim Jagielski
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* @copyright 2004 - 2009 Andy Prevost
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* @license https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html GNU Lesser General Public License
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* @note This program is distributed in the hope that it will be useful - WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*/
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namespace PHPMailer\PHPMailer;
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/**
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* PHPMailer POP-Before-SMTP Authentication Class.
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* Specifically for PHPMailer to use for RFC1939 POP-before-SMTP authentication.
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* 1) This class does not support APOP authentication.
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* 2) Opening and closing lots of POP3 connections can be quite slow. If you need
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* to send a batch of emails then just perform the authentication once at the start,
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* and then loop through your mail sending script. Providing this process doesn't
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* take longer than the verification period lasts on your POP3 server, you should be fine.
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* 3) This is really ancient technology; you should only need to use it to talk to very old systems.
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* 4) This POP3 class is deliberately lightweight and incomplete, implementing just
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* enough to do authentication.
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* If you want a more complete class there are other POP3 classes for PHP available.
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*
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* @author Richard Davey (original author) <rich@corephp.co.uk>
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* @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
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* @author Jim Jagielski (jimjag) <jimjag@gmail.com>
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* @author Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
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*/
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class POP3
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{
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/**
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* The POP3 PHPMailer Version number.
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*
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* @var string
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*/
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const VERSION = '6.9.1';
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/**
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* Default POP3 port number.
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*
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* @var int
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*/
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const DEFAULT_PORT = 110;
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/**
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* Default timeout in seconds.
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*
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* @var int
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*/
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const DEFAULT_TIMEOUT = 30;
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/**
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* POP3 class debug output mode.
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* Debug output level.
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* Options:
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* @see POP3::DEBUG_OFF: No output
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* @see POP3::DEBUG_SERVER: Server messages, connection/server errors
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* @see POP3::DEBUG_CLIENT: Client and Server messages, connection/server errors
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*
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* @var int
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*/
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public $do_debug = self::DEBUG_OFF;
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/**
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* POP3 mail server hostname.
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*
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* @var string
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*/
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public $host;
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/**
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* POP3 port number.
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*
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* @var int
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*/
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public $port;
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/**
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* POP3 Timeout Value in seconds.
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*
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* @var int
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*/
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public $tval;
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/**
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* POP3 username.
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*
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* @var string
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*/
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public $username;
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/**
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* POP3 password.
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*
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* @var string
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*/
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public $password;
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/**
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* Resource handle for the POP3 connection socket.
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*
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* @var resource
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*/
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protected $pop_conn;
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/**
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* Are we connected?
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*
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* @var bool
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*/
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protected $connected = false;
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/**
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* Error container.
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*
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* @var array
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*/
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protected $errors = [];
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/**
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* Line break constant.
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*/
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const LE = "\r\n";
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/**
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* Debug level for no output.
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*
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* @var int
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*/
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const DEBUG_OFF = 0;
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/**
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* Debug level to show server -> client messages
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* also shows clients connection errors or errors from server
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*
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* @var int
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*/
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const DEBUG_SERVER = 1;
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/**
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* Debug level to show client -> server and server -> client messages.
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*
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* @var int
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*/
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const DEBUG_CLIENT = 2;
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/**
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* Simple static wrapper for all-in-one POP before SMTP.
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*
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* @param string $host The hostname to connect to
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* @param int|bool $port The port number to connect to
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* @param int|bool $timeout The timeout value
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* @param string $username
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* @param string $password
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* @param int $debug_level
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*
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* @return bool
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*/
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public static function popBeforeSmtp(
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$host,
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$port = false,
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$timeout = false,
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$username = '',
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$password = '',
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$debug_level = 0
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) {
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$pop = new self();
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return $pop->authorise($host, $port, $timeout, $username, $password, $debug_level);
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}
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/**
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* Authenticate with a POP3 server.
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* A connect, login, disconnect sequence
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* appropriate for POP-before SMTP authorisation.
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*
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* @param string $host The hostname to connect to
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* @param int|bool $port The port number to connect to
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* @param int|bool $timeout The timeout value
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* @param string $username
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* @param string $password
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* @param int $debug_level
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*
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* @return bool
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*/
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public function authorise($host, $port = false, $timeout = false, $username = '', $password = '', $debug_level = 0)
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{
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$this->host = $host;
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//If no port value provided, use default
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if (false === $port) {
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$this->port = static::DEFAULT_PORT;
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} else {
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$this->port = (int) $port;
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}
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//If no timeout value provided, use default
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if (false === $timeout) {
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$this->tval = static::DEFAULT_TIMEOUT;
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} else {
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$this->tval = (int) $timeout;
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}
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$this->do_debug = $debug_level;
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$this->username = $username;
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$this->password = $password;
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//Reset the error log
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$this->errors = [];
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//Connect
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$result = $this->connect($this->host, $this->port, $this->tval);
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if ($result) {
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$login_result = $this->login($this->username, $this->password);
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if ($login_result) {
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$this->disconnect();
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return true;
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}
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}
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//We need to disconnect regardless of whether the login succeeded
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$this->disconnect();
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return false;
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}
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/**
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* Connect to a POP3 server.
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*
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* @param string $host
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* @param int|bool $port
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* @param int $tval
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*
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* @return bool
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*/
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public function connect($host, $port = false, $tval = 30)
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{
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//Are we already connected?
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if ($this->connected) {
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return true;
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}
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//On Windows this will raise a PHP Warning error if the hostname doesn't exist.
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//Rather than suppress it with @fsockopen, capture it cleanly instead
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set_error_handler([$this, 'catchWarning']);
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if (false === $port) {
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$port = static::DEFAULT_PORT;
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}
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//Connect to the POP3 server
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$errno = 0;
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$errstr = '';
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$this->pop_conn = fsockopen(
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$host, //POP3 Host
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$port, //Port #
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$errno, //Error Number
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$errstr, //Error Message
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$tval
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); //Timeout (seconds)
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//Restore the error handler
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restore_error_handler();
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//Did we connect?
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if (false === $this->pop_conn) {
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//It would appear not...
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$this->setError(
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"Failed to connect to server $host on port $port. errno: $errno; errstr: $errstr"
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);
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return false;
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}
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//Increase the stream time-out
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stream_set_timeout($this->pop_conn, $tval, 0);
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//Get the POP3 server response
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$pop3_response = $this->getResponse();
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//Check for the +OK
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if ($this->checkResponse($pop3_response)) {
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//The connection is established and the POP3 server is talking
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$this->connected = true;
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return true;
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}
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return false;
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}
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/**
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* Log in to the POP3 server.
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* Does not support APOP (RFC 2828, 4949).
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*
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* @param string $username
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* @param string $password
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*
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* @return bool
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*/
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public function login($username = '', $password = '')
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{
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if (!$this->connected) {
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$this->setError('Not connected to POP3 server');
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return false;
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}
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if (empty($username)) {
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$username = $this->username;
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}
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if (empty($password)) {
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$password = $this->password;
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}
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//Send the Username
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$this->sendString("USER $username" . static::LE);
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$pop3_response = $this->getResponse();
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if ($this->checkResponse($pop3_response)) {
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//Send the Password
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$this->sendString("PASS $password" . static::LE);
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$pop3_response = $this->getResponse();
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if ($this->checkResponse($pop3_response)) {
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return true;
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}
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}
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return false;
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}
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/**
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* Disconnect from the POP3 server.
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*/
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public function disconnect()
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{
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// If could not connect at all, no need to disconnect
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if ($this->pop_conn === false) {
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return;
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}
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$this->sendString('QUIT' . static::LE);
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// RFC 1939 shows POP3 server sending a +OK response to the QUIT command.
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// Try to get it. Ignore any failures here.
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try {
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$this->getResponse();
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} catch (Exception $e) {
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//Do nothing
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}
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//The QUIT command may cause the daemon to exit, which will kill our connection
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//So ignore errors here
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try {
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@fclose($this->pop_conn);
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} catch (Exception $e) {
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//Do nothing
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}
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// Clean up attributes.
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$this->connected = false;
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$this->pop_conn = false;
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}
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/**
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* Get a response from the POP3 server.
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*
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* @param int $size The maximum number of bytes to retrieve
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*
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* @return string
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*/
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protected function getResponse($size = 128)
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{
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$response = fgets($this->pop_conn, $size);
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if ($this->do_debug >= self::DEBUG_SERVER) {
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echo 'Server -> Client: ', $response;
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}
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return $response;
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}
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/**
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* Send raw data to the POP3 server.
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*
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* @param string $string
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*
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* @return int
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*/
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protected function sendString($string)
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{
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if ($this->pop_conn) {
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if ($this->do_debug >= self::DEBUG_CLIENT) { //Show client messages when debug >= 2
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echo 'Client -> Server: ', $string;
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}
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return fwrite($this->pop_conn, $string, strlen($string));
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}
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return 0;
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}
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/**
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* Checks the POP3 server response.
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* Looks for for +OK or -ERR.
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*
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* @param string $string
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*
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* @return bool
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*/
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protected function checkResponse($string)
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{
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if (strpos($string, '+OK') !== 0) {
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$this->setError("Server reported an error: $string");
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return false;
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}
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return true;
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}
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/**
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* Add an error to the internal error store.
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* Also display debug output if it's enabled.
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*
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* @param string $error
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*/
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protected function setError($error)
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{
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$this->errors[] = $error;
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if ($this->do_debug >= self::DEBUG_SERVER) {
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echo '<pre>';
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foreach ($this->errors as $e) {
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print_r($e);
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}
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echo '</pre>';
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}
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}
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/**
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* Get an array of error messages, if any.
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*
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* @return array
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*/
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public function getErrors()
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{
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return $this->errors;
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}
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/**
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* POP3 connection error handler.
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*
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* @param int $errno
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* @param string $errstr
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* @param string $errfile
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* @param int $errline
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*/
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protected function catchWarning($errno, $errstr, $errfile, $errline)
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{
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$this->setError(
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'Connecting to the POP3 server raised a PHP warning:' .
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"errno: $errno errstr: $errstr; errfile: $errfile; errline: $errline"
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);
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}
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}
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