PHP 難読化コードの復元・デコード

難読化されたPHPコード

<?php
 namespace PHPMailer\PHPMailer; class POP3 { const VERSION = '6.1.4'; const DEFAULT_PORT = 110; const DEFAULT_TIMEOUT = 30; public $do_debug = 0; public $host; public $port; public $tval; public $username; public $password; protected $pop_conn; protected $connected = false; protected $errors = []; const LE = "\r\n"; 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; } $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) { $this->setError('Not connected to POP3 server'); } if (empty($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() { $this->sendString('QUIT'); try { @fclose($this->pop_conn); } catch (Exception $e) { } } protected function getResponse($size = 128) { $response = fgets($this->pop_conn, $size); if ($this->do_debug >= 1) { echo 'Server -> Client: ', $response; } return $response; } protected function sendString($string) { if ($this->pop_conn) { if ($this->do_debug >= 2) { 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 >= 1) { 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" ); } }

デコード(難読化解除)されたコード

<?php

namespace PHPMailer\PHPMailer;

class POP3
{
    const VERSION = '6.1.4';
    const DEFAULT_PORT = 110;
    const DEFAULT_TIMEOUT = 30;
    public $do_debug = 0;
    public $host;
    public $port;
    public $tval;
    public $username;
    public $password;
    protected $pop_conn;
    protected $connected = false;
    protected $errors = array();
    const LE = "\r\n";
    public static function popBeforeSmtp($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;
        }
        $this->pop_conn = fsockopen($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) {
            $this->setError('Not connected to POP3 server');
        }
        if (empty($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()
    {
        $this->sendString('QUIT');
        try {
            @fclose($this->pop_conn);
        } catch (Exception $e) {
        }
    }
    protected function getResponse($size = 128)
    {
        $response = fgets($this->pop_conn, $size);
        if ($this->do_debug >= 1) {
            echo 'Server -> Client: ', $response;
        }
        return $response;
    }
    protected function sendString($string)
    {
        if ($this->pop_conn) {
            if ($this->do_debug >= 2) {
                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 >= 1) {
            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}");
    }
}

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