ip_block_mu_plugin_gui.php

<?php

function get_real_client_ip()

    {
       $ipaddress = '';
       if (isset($_SERVER['HTTP_CLIENT_IP']))
         $ipaddress = $_SERVER['HTTP_CLIENT_IP'];
       else if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
         $ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
       else if (isset($_SERVER['HTTP_X_FORWARDED']))
         $ipaddress = $_SERVER['HTTP_X_FORWARDED'];
       else if (isset($_SERVER['HTTP_FORWARDED_FOR']))
         $ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
       else if (isset($_SERVER['HTTP_FORWARDED']))
         $ipaddress = $_SERVER['HTTP_FORWARDED'];
       else if (isset($_SERVER['REMOTE_ADDR']))
         $ipaddress = $_SERVER['REMOTE_ADDR'];
       else
         $ipaddress = 'Unknown';
       return $ipaddress;
       }


add_action('admin_init', 'lynt_blokace_register_settings');
add_action('admin_menu', 'lynt_blokace_register_settings_page');
add_action('init', 'lynt_blokace_init');


function lynt_blokace_init()
    {
        $ips = preg_split("/(\r\n|\n|\r)/", get_option('lynt_blokace_ips'), -1, PREG_SPLIT_NO_EMPTY);
        if (sizeof($ips) &&  !in_array( get_real_client_ip(), $ips)) wp_die('Smolík');

      }

function lynt_blokace_register_settings_page()
    {
       add_options_page('Nastavení Blokace', 'Blokace', 'manage_options', 'lynt-blokace', 'lynt_blokace_render_settings_page');
       }

function lynt_blokace_register_settings()
    {

       add_option('lynt_blokace_ips', '');
       register_setting('lynt_blokace_group', 'lynt_blokace_ips');
       }

function lynt_blokace_render_settings_page()

    {
       ?>
  <div class="wrap">
  <h1>Blokace</h1>
  <form method="post" action="options.php">
  <?php settings_fields('lynt_blokace_group');
      ?>
  <table class="form-table">
  <tr>
  <th scope="row"><label for="lynt_blokace_ips">Povolené IP</label></th>
  <td><textarea id="lynt_blokace_ips" name="lynt_blokace_ips" placeholder="IP na každý řádek" rows="20" cols="20"><?php echo sanitize_textarea_field(get_option('lynt_blokace_ips')); ?></textarea>
  </tr>
  </table>
  <small>Vaše IP: <?php echo get_real_client_ip(); ?></small>
  <?php submit_button();
      ?>
  </form>
  </div>
<?php
      }