CloudFlare and logging visitor IP addresses via in

问题:

I'm trying to track and log users/visitors that are accessing my website using PHP's $_SERVER['REMOTE_ADDR'] to do so. A typical method for IP address tracking in PHP.

However, I am using CloudFlare for caching and such and receiving their IP addresses as CloudFlare's:

108.162.212.* - 108.162.239.*

What would be a correct method of retrieving the actual users/visitors IP address while still using CloudFlare?

回答1:

Extra server variables that are available to cloud flare are:

$_SERVER["HTTP_CF_CONNECTING_IP"] real visitor ip address, this is what you want

$_SERVER["HTTP_CF_IPCOUNTRY"] country of visitor

$_SERVER["HTTP_CF_RAY"] see description here

$_SERVER["HTTP_CF_VISITOR"] this can help you know if its http or https

you can use it like this:

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

If you do this, and the validity of the visiting IP address is important, you might need to verify that the $_SERVER["REMOTE_ADDR"] contains an actual valid cloudflare IP address, because anyone can fake the header if he was able to connect directly to the server IP.

回答2:

Since this question was asked and answered, CloudFlare has released mod_cloudflare for Apache, which logs & displays the actual visitor IP address rather than the CloudFlare address:

https://www.cloudflare.com/resources-downloads#mod_cloudflare

回答3:

Cloudflare sends some additional request headers to your server including CF-Connecting-IP which we can store into $user_ip, if defined, using this simple one-liner:

$user_ip = (isset($_SERVER["HTTP_CF_CONNECTING_IP"])?$_SERVER["HTTP_CF_CONNECTING_IP"]:$_SERVER['REMOTE_ADDR']);

回答4:

I am rewriting my answer i used for another question "CloudFlare DNS / direct IP identifier"

Cloudflare's ips are stored in public so you can go view them here then check if the ip is from cloudflare (this will allow us to get the real ip from the http header HTTP_CF_CONNECTING_IP).

If you are using this to disable all non cf connections or vice versa, i recommend you to have a single php script file that gets called before every other script such as a common.php or pagestart.php etc.

function ip_in_range($ip, $range) {
    if (strpos($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));
}

function _cloudflare_CheckIP($ip) {
    $cf_ips = array(
        '199.27.128.0/21',
        '173.245.48.0/20',
        '103.21.244.0/22',
        '103.22.200.0/22',
        '103.31.4.0/22',
        '141.101.64.0/18',
        '108.162.192.0/18',
        '190.93.240.0/20',
        '188.114.96.0/20',
        '197.234.240.0/22',
        '198.41.128.0/17',
        '162.158.0.0/15',
        '104.16.0.0/12',
    );
    $is_cf_ip = false;
    foreach ($cf_ips as $cf_ip) {
        if (ip_in_range($ip, $cf_ip)) {
            $is_cf_ip = true;
            break;
        }
    } return $is_cf_ip;
}

function _cloudflare_Requests_Check() {
    $flag = true;

    if(!isset($_SERVER['HTTP_CF_CONNECTING_IP']))   $flag = false;
    if(!isset($_SERVER['HTTP_CF_IPCOUNTRY']))       $flag = false;
    if(!isset($_SERVER['HTTP_CF_RAY']))             $flag = false;
    if(!isset($_SERVER['HTTP_CF_VISITOR']))         $flag = false;
    return $flag;
}

function isCloudflare() {
    $ipCheck        = _cloudflare_CheckIP($_SERVER['REMOTE_ADDR']);
    $requestCheck   = _cloudflare_Requests_Check();
    return ($ipCheck && $requestCheck);
}

// Use when handling ip's
function getRequestIP() {
    $check = isCloudflare();

    if($check) {
        return $_SERVER['HTTP_CF_CONNECTING_IP'];
    } else {
        return $_SERVER['REMOTE_ADDR'];
    }
}

To use the script it's quite simple:

$ip = getRequestIP();
$cf = isCloudflare();

if($cf) echo "Cloudflare :D<br>";
else    echo "Not cloudflare o_0";

echo "Your actual ip address is: ". $ip;

This script will show you the real ip address and if the request is CF or not!

回答5:

It would be hard to convert HTTP_CF_CONNECTING_IP to REMOTE_ADDR. So you can use apache (.htaccess) auto prepending to do that. So that you do not need to think about whether the $_SERVER['REMOTE_ADDR'] has the correct value in all the PHP scripts.

.htaccess code

php_value auto_prepend_file "/path/to/file.php"

php code (file.php)

<?php

define('CLIENT_IP', isset($_SERVER['HTTP_CF_CONNECTING_IP']) ? $_SERVER['HTTP_CF_CONNECTING_IP'] : $_SERVER['REMOTE_ADDR']);

Learn More here

回答6:

HTTP_CF_CONNECTING_IP is only working if you are using cloudflare maybe you transfer your site or remove cloudflare you will forget the value so use this code .

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

回答7:

For magento 1.x users (I haven't try magento 2.0 yet), check https://tall-paul.co.uk/2012/03/13/magento-show-remote-ip-in-cloudflare-the-right-way/ which needs to change app/etc/local.xml and add: HTTP_CF_CONNECTING_IP

回答8:

When you are using CloudFlare all your requests between your server and users are routed through CloudFlare servers.

In this case there are two methods to get User's Real IP Address:

1. Through Extra Server Headers added by CloudFlare Servers
2. Adding a CloudFlare Apache/NGINX Module on your server.

Method 1: Get IP though extra Server Headers

You can use the following code to get user's IP Address:

$user_ip = (isset($_SERVER["HTTP_CF_CONNECTING_IP"]) $_SERVER["HTTP_CF_CONNECTING_IP"]:$_SERVER['REMOTE_ADDR']);

How it is working?

CloudFlare adds some extra server variables in the request as follows:

$_SERVER["HTTP_CF_CONNECTING_IP"] - Real IP Address of user

$_SERVER["HTTP_CF_IPCOUNTRY"] - ISO2 Country of the User

$_SERVER["HTTP_CF_RAY"] A Special string for loggin purpose

In the above code, we are checking if $_SERVER["HTTP_CF_CONNECTING_IP"] is set or not. If it is there we will consider that as user's IP Address else we will use the default code as $_SERVER['REMOTE_ADDR']

Method 2: Installing Cloudflare Module on your server

• Installing CloudFlare Module on Apache Server
• Installing CloudFlare Module on NGINX Server
• Installing CloudFlare Module on EasyApache+CPanel