通过CloudFlare获取正确的访客IP

Question

我正在使用转售给我的其他人的 cPanel。这可能意味着我不能使用 mod_cloudflare

我想获取访问者的IP，而不是CloudFlare IP。我正在使用的代码部分：

$_SERVER['REMOTE_ADDR']

该行将获取cloud flare的IP，而不是原始用户的IP。

有什么办法可以得到访问者的原始IP地址吗？

Answer 1

可以，但是 without access to the server configuration，您将无法使用 $_SERVER['REMOTE_ADDR']。

但是，您可以still use X-Forwarded-For and CF-Connecting-IP。两者都可以在 $_SERVER 超级全局中使用。

Answer 2

我在我的应用程序中使用了以下函数：http://ipaddress.standingtech.com/ to exclude CloudFlare IP address

<?php

/*
 * @param $ips = array of IP address
 */
function clear_flare_ips($ips){
  foreach($ips as $index => $ip){
    if(is_in_flareips($ip)){
      unset($ips[$index]);
    }
  }
  ksort($ips);
  return $ips;
}

function is_in_flareips($ip){
 $flareips = getflareips();
 foreach($flareips as $range){
   if(ip_in_range( $ip, $range )){
    return true;
   }
 }
 return false;
}

function getallips(){
      if (isset($_SERVER['HTTP_CLIENT_IP']))
          $ipaddress[] = $_SERVER['HTTP_CLIENT_IP'];
      if(isset($_SERVER['HTTP_X_FORWARDED_FOR']))
          $ipaddress[] = $_SERVER['HTTP_X_FORWARDED_FOR'];
      if(isset($_SERVER['HTTP_X_FORWARDED']))
          $ipaddress[] = $_SERVER['HTTP_X_FORWARDED'];
      if(isset($_SERVER['HTTP_FORWARDED_FOR']))
          $ipaddress[] = $_SERVER['HTTP_FORWARDED_FOR'];
      if(isset($_SERVER['HTTP_FORWARDED']))
          $ipaddress[] = $_SERVER['HTTP_FORWARDED'];
      if(isset($_SERVER['REMOTE_ADDR']))
          $ipaddress[] = $_SERVER['REMOTE_ADDR'];
      if(count($ipaddress) == 0)
          $ipaddress[] = 'UNKNOWN';
      return $ipaddress;
}

function getflareips(){
  /*
  https://www.cloudflare.com/ips-v4
  */
  return array(
  '103.21.244.0/22',
  '103.22.200.0/22',
  '103.31.4.0/22',
  '104.16.0.0/12',
  '108.162.192.0/18',
  '131.0.72.0/22',
  '141.101.64.0/18',
  '162.158.0.0/15',
  '172.64.0.0/13',
  '173.245.48.0/20',
  '188.114.96.0/20',
  '190.93.240.0/20',
  '197.234.240.0/22',
  '198.41.128.0/17',
  '199.27.128.0/21'
  );
}

function ip_in_range( $ip, $range ) {
/**
 * Check if a given ip is in a network
 * @param  string $ip    IP to check in IPV4 format eg. 127.0.0.1
 * @param  string $range IP/CIDR netmask eg. 127.0.0.0/24, also 127.0.0.1 is accepted and /32 assumed
 * @return boolean true if the ip is in this range / false if not.
 */
    if ( strpos( $range, '/' ) == false ) {
        $range .= '/32';
    }
    // $range is in IP/CIDR format eg 127.0.0.1/24
    list( $range, $netmask ) = explode( '/', $range, 2 );
    $range_decimal = ip2long( $range );
    $ip_decimal = ip2long( $ip );
    $wildcard_decimal = pow( 2, ( 32 - $netmask ) ) - 1;
    $netmask_decimal = ~ $wildcard_decimal;
    return ( ( $ip_decimal & $netmask_decimal ) == ( $range_decimal & $netmask_decimal ) );
}

Answer 3

Akam 的回答过于复杂，无法解决。这是一个更简单的方法：

if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
  $_SERVER['REMOTE_ADDR'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
}

通过CloudFlare获取正确的访客IP

Get correct visitor IP through CloudFlare

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