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Matzelle (original founder) * @copyright 2012 - 2020 Marcus Bointon * @copyright 2010 - 2012 Jim Jagielski * @copyright 2004 - 2009 Andy Prevost * @license https://www.gnu.org/licenses/old-licenses/lgpl-2.1.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) * @author Marcus Bointon (Synchro/coolbru) * @author Jim Jagielski (jimjag) * @author Andy Prevost (codeworxtech) */ class POP3 { /** * The POP3 PHPMailer Version number. * * @var string * @deprecated This constant will be removed in PHPMailer 8.0. Use `PHPMailer::VERSION` instead. */ const VERSION = '7.1.1'; /** * Default POP3 port number. * * @var int */ const DEFAULT_PORT = 110; /** * Default timeout in seconds. * * @var int */ const DEFAULT_TIMEOUT = 30; /** * POP3 class debug output mode. * Debug output level. * Options: * @see POP3::DEBUG_OFF: No output * @see POP3::DEBUG_SERVER: Server messages, connection/server errors * @see POP3::DEBUG_CLIENT: Client and Server messages, connection/server errors * * @var int */ public $do_debug = self::DEBUG_OFF; /** * POP3 mail server hostname. * * @var string */ public $host; /** * POP3 port number. * * @var int */ public $port; /** * POP3 Timeout Value in seconds. * * @var int */ public $tval; /** * POP3 username. * * @var string */ public $username; /** * POP3 password. * * @var string */ public $password; /** * Resource handle for the POP3 connection socket. * * @var resource */ protected $pop_conn; /** * Are we connected? * * @var bool */ protected $connected = false; /** * Error container. * * @var array */ protected $errors = []; /** * Line break constant. */ const LE = "\r\n"; /** * Debug level for no output. * * @var int */ const DEBUG_OFF = 0; /** * Debug level to show server -> client messages * also shows clients connection errors or errors from server * * @var int */ const DEBUG_SERVER = 1; /** * Debug level to show client -> server and server -> client messages. * * @var int */ const DEBUG_CLIENT = 2; /** * Simple static wrapper for all-in-one POP before SMTP. * * @param string $host The hostname to connect to * @param int|bool $port The port number to connect to * @param int|bool $timeout The timeout value * @param string $username * @param string $password * @param int $debug_level * * @return bool */ 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); } /** * Authenticate with a POP3 server. * A connect, login, disconnect sequence * appropriate for POP-before SMTP authorisation. * * @param string $host The hostname to connect to * @param int|bool $port The port number to connect to * @param int|bool $timeout The timeout value * @param string $username * @param string $password * @param int $debug_level * * @return bool */ public function authorise($host, $port = false, $timeout = false, $username = '', $password = '', $debug_level = 0) { $this->host = $host; //If no port value provided, use default if (false === $port) { $this->port = static::DEFAULT_PORT; } else { $this->port = (int) $port; } //If no timeout value provided, use default if (false === $timeout) { $this->tval = static::DEFAULT_TIMEOUT; } else { $this->tval = (int) $timeout; } $this->do_debug = (int) $debug_level; $this->username = self::stripControls($username); $this->password = self::stripControls($password); //Reset the error log $this->errors = []; //Connect $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; } } //We need to disconnect regardless of whether the login succeeded $this->disconnect(); return false; } /** * Connect to a POP3 server. * * @param string $host * @param int|bool $port * @param int $tval * * @return bool */ public function connect($host, $port = false, $tval = 30) { //Are we already connected? if ($this->connected) { return true; } //On Windows this will raise a PHP Warning error if the hostname doesn't exist. //Rather than suppress it with @fsockopen, capture it cleanly instead set_error_handler(function () { call_user_func_array([$this, 'catchWarning'], func_get_args()); }); if (false === $port) { $port = static::DEFAULT_PORT; } //Connect to the POP3 server $errno = 0; $errstr = ''; $this->pop_conn = fsockopen( $host, //POP3 Host $port, //Port # $errno, //Error Number $errstr, //Error Message $tval ); //Timeout (seconds) //Restore the error handler restore_error_handler(); //Did we connect? if (false === $this->pop_conn) { //It would appear not... $this->setError( "Failed to connect to server $host on port $port. errno: $errno; errstr: $errstr" ); return false; } //Increase the stream time-out stream_set_timeout($this->pop_conn, $tval, 0); //Get the POP3 server response $pop3_response = $this->getResponse(); //Check for the +OK if ($this->checkResponse($pop3_response)) { //The connection is established and the POP3 server is talking $this->connected = true; return true; } return false; } /** * Log in to the POP3 server. * Does not support APOP (RFC 2828, 4949). * * @param string $username * @param string $password * * @return bool */ public function login($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; } $username = self::stripControls($username); $password = self::stripControls($password); //Send the Username $this->sendString("USER $username" . static::LE); $pop3_response = $this->getResponse(); if ($this->checkResponse($pop3_response)) { //Send the Password $this->sendString("PASS $password" . static::LE); $pop3_response = $this->getResponse(); if ($this->checkResponse($pop3_response)) { return true; } } return false; } /** * Disconnect from the POP3 server. */ public function disconnect() { // If could not connect at all, no need to disconnect if ($this->pop_conn === false) { return; } $this->sendString('QUIT' . static::LE); // RFC 1939 shows POP3 server sending a +OK response to the QUIT command. // Try to get it. Ignore any failures here. try { $this->getResponse(); } catch (Exception $e) { //Do nothing } //The QUIT command may cause the daemon to exit, which will kill our connection //So ignore errors here try { @fclose($this->pop_conn); } catch (Exception $e) { //Do nothing } // Clean up attributes. $this->connected = false; $this->pop_conn = false; } /** * Get a response from the POP3 server. * * @param int $size The maximum number of bytes to retrieve * * @return string */ protected function getResponse($size = 128) { $response = fgets($this->pop_conn, $size); if ($this->do_debug >= self::DEBUG_SERVER) { echo 'Server -> Client: ', $response; } return $response; } /** * Send raw data to the POP3 server. * * @param string $string * * @return int */ protected function sendString($string) { if ($this->pop_conn) { if ($this->do_debug >= self::DEBUG_CLIENT) { //Show client messages when debug >= 2 echo 'Client -> Server: ', $string; } return fwrite($this->pop_conn, $string, strlen($string)); } return 0; } /** * Checks the POP3 server response. * Looks for +OK or -ERR. * * @param string $string * * @return bool */ protected function checkResponse($string) { if (strpos($string, '+OK') !== 0) { $this->setError("Server reported an error: $string"); return false; } return true; } /** * Add an error to the internal error store. * Also display debug output if it's enabled. * * @param string $error */ protected function setError($error) { $this->errors[] = $error; if ($this->do_debug >= self::DEBUG_SERVER) { echo '
';
            foreach ($this->errors as $e) {
                print_r($e);
            }
            echo '
'; } } /** * Get an array of error messages, if any. * * @return array */ public function getErrors() { return $this->errors; } /** * POP3 connection error handler. * * @param int $errno * @param string $errstr * @param string $errfile * @param int $errline */ protected function catchWarning($errno, $errstr, $errfile, $errline) { $this->setError( 'Connecting to the POP3 server raised a PHP warning:' . "errno: $errno errstr: $errstr; errfile: $errfile; errline: $errline" ); } /** * Strip all control chars from a string. * * @param $string * * @return string */ protected static function stripControls($string) { return preg_replace('/[\x00-\x1F\x7F]/u', '', $string); } }