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<?php
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* Check if a given ipv4 address is in a given cidr
* @param string $ip IP to check in IPV4 format eg. 127.0.0.1
* @param string $range IP/CIDR netmask eg. 127.0.0.0/24, also 127.0.0.1 is accepted and /32 assumed
* @return boolean true if the ip is in this range / false if not.
* @author Thorsten Ott <https://gist.github.com/tott/7684443>
*/
function ip4_in_cidr($ip, $cidr) {
if (strpos($cidr, '/') == false) {
$cidr .= '/32';
}
// $range is in IP/CIDR format eg 127.0.0.1/24
list( $cidr, $netmask ) = explode('/', $cidr, 2);
$range_decimal = ip2long($cidr);
$ip_decimal = ip2long($ip);
$wildcard_decimal = pow(2, ( 32 - $netmask)) - 1;
$netmask_decimal = ~ $wildcard_decimal;
return ( ( $ip_decimal & $netmask_decimal ) == ( $range_decimal & $netmask_decimal ) );
}
/**
* Check if a given ipv6 address is in a given cidr
* @param string $ip IP to check in IPV6 format
* @param string $cidr CIDR netmask
* @return boolean true if the IP is in this range, false otherwise.
6 years ago
* @author MW. <https://stackoverflow.com/a/7952169>
*/
function ip6_in_cidr($ip, $cidr) {
$address = inet_pton($ip);
$subnetAddress = inet_pton(explode("/", $cidr)[0]);
$subnetMask = explode("/", $cidr)[1];
$addr = str_repeat("f", $subnetMask / 4);
switch ($subnetMask % 4) {
case 0:
break;
case 1:
$addr .= "8";
break;
case 2:
$addr .= "c";
break;
case 3:
$addr .= "e";
break;
}
$addr = str_pad($addr, 32, '0');
$addr = pack("H*", $addr);
$binMask = $addr;
return ($address & $binMask) == $subnetAddress;
}
/**
* Check if the REMOTE_ADDR is on Cloudflare's network.
* @return boolean true if it is, otherwise false
*/
function validateCloudflare() {
if (filter_var($_SERVER["REMOTE_ADDR"], FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
// Using IPv6
$cloudflare_ips_v6 = [
"2400:cb00::/32",
"2405:8100::/32",
"2405:b500::/32",
"2606:4700::/32",
"2803:f800::/32",
"2c0f:f248::/32",
"2a06:98c0::/29"
];
$valid = false;
foreach ($cloudflare_ips_v6 as $cidr) {
if (ip6_in_cidr($_SERVER["REMOTE_ADDR"], $cidr)) {
$valid = true;
break;
}
}
} else {
// Using IPv4
$cloudflare_ips_v4 = [
"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"
];
$valid = false;
foreach ($cloudflare_ips_v4 as $cidr) {
if (ip4_in_cidr($_SERVER["REMOTE_ADDR"], $cidr)) {
$valid = true;
break;
}
}
}
return $valid;
}
/**
* Makes a good guess at the client's real IP address.
*
* @return string Client IP or `0.0.0.0` if we can't find anything
*/
function getClientIP() {
// If CloudFlare is in the mix, we should use it.
// Check if the request is actually from CloudFlare before trusting it.
if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
if (validateCloudflare()) {
return $_SERVER["HTTP_CF_CONNECTING_IP"];
}
}
if (isset($_SERVER["REMOTE_ADDR"])) {
return $_SERVER["REMOTE_ADDR"];
}
return "0.0.0.0"; // This will not happen unless we aren't a web server
}