execute.php

<?php

/*
 * Looking Glass - An easy to deploy Looking Glass
 * Copyright (C) 2014-2020 Guillaume Mazoyer <gmazoyer@gravitons.in>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */

require_once('includes/config.defaults.php');
require_once('config.php');
require_once('routers/router.php');
require_once('includes/utils.php');

// From where the user *really* comes from.
if ($config['misc']['enable_http_x_forwarded_for'] === true && isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
  // The user can pass several proxy's, which each one will add its own IP address,
  //  so we like to take only the first IP address
  $ips = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
  $ip = trim($ips[0]);
  $requester = is_valid_ip_address($ip) ? $ip : $_SERVER['REMOTE_ADDR']; // as a fallback we use the REMOTE_ADDR
} else {
  $requester = $_SERVER['REMOTE_ADDR'];
}

// Obvious spam
if (!isset($_POST['dontlook']) || !empty($_POST['dontlook'])) {
  log_to_file('Spam detected from '.$requester.'.');
  die('Spam detected');
}

// Just asked for the documentation
if (isset($_POST['doc']) && !empty($_POST['doc'])) {
  $query = htmlspecialchars($_POST['doc']);
  print(json_encode($config['doc'][$query]));
}

if (isset($_POST['query']) && !empty($_POST['query']) &&
    isset($_POST['routers']) && !empty($_POST['routers']) &&
    isset($_POST['parameter']) && !empty($_POST['parameter'])) {
  $query = trim($_POST['query']);
  $hostname = trim($_POST['routers']);
  $parameter = trim($_POST['parameter']);

  // Check if query is disabled
  if (!isset($config['doc'][$query]['command'])) {
    $error = 'This query has been disabled in the configuration.';
    print(json_encode(array('error' => $error)));
    return;
  }

  // Process captcha if it is enabled
  if ($config['recaptcha']['enabled'] &&
      isset($config['recaptcha']['apikey']) &&
      isset($config['recaptcha']['secret'])) {
    $response = $_POST['g-recaptcha-response'];
    $verify = file_get_contents($config['recaptcha']['url'].'?secret='.
                                $config['recaptcha']['secret'].'&response='.
                                $response.'&remoteip='.$requester);
    $recaptcha = json_decode($verify, true);

    if ($recaptcha["success"] == false) {
      $error = 'Are you a robot?';
      print(json_encode(array('error' => $error)));
      return;
    }
  }

  // Do the processing
  $router = Router::instance($hostname, $requester);
  $router_config = $router->get_config();

  // Check if parameter is an IPv6 and if IPv6 is disabled
  if (match_ipv6($parameter) && $router_config['disable_ipv6']) {
    $error = 'IPv6 has been disabled for this router, you can only use IPv4.';
    print(json_encode(array('error' => $error)));
    return;
  }

  // Check if parameter is an IPv4 and if IPv4 is disabled
  if (match_ipv4($parameter) && $router_config['disable_ipv4']) {
    $error = 'IPv4 has been disabled for this router, you can only use IPv6.';
    print(json_encode(array('error' => $error)));
    return;
  }

  try {
    $output = $router->send_command($query, $parameter);
  } catch (Exception $e) {
    $error = $e->getMessage();
  }

  if (isset($output)) {
    // Display the result of the command
    $data = array('result' => $output);
  } else {
    // Display the error
    $data = array('error' => $error);
  }

  print(json_encode($data));
}

// End of execute.php