forked from Business/BinStack
132 lines
3.9 KiB
PHP
132 lines
3.9 KiB
PHP
<?php
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* Check if a given ipv4 address is in a given cidr
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* @param string $ip IP to check in IPV4 format eg. 127.0.0.1
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* @param string $range IP/CIDR netmask eg. 127.0.0.0/24, also 127.0.0.1 is accepted and /32 assumed
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* @return boolean true if the ip is in this range / false if not.
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* @author Thorsten Ott <https://gist.github.com/tott/7684443>
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*/
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function ip4_in_cidr($ip, $cidr) {
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if (strpos($cidr, '/') == false) {
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$cidr .= '/32';
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}
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// $range is in IP/CIDR format eg 127.0.0.1/24
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list( $cidr, $netmask ) = explode('/', $cidr, 2);
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$range_decimal = ip2long($cidr);
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$ip_decimal = ip2long($ip);
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$wildcard_decimal = pow(2, ( 32 - $netmask)) - 1;
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$netmask_decimal = ~ $wildcard_decimal;
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return ( ( $ip_decimal & $netmask_decimal ) == ( $range_decimal & $netmask_decimal ) );
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}
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/**
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* Check if a given ipv6 address is in a given cidr
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* @param string $ip IP to check in IPV6 format
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* @param string $cidr CIDR netmask
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* @return boolean true if the IP is in this range, false otherwise.
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* @author MW. <https://stackoverflow.com/a/7952169>
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*/
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function ip6_in_cidr($ip, $cidr) {
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$address = inet_pton($ip);
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$subnetAddress = inet_pton(explode("/", $cidr)[0]);
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$subnetMask = explode("/", $cidr)[1];
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$addr = str_repeat("f", $subnetMask / 4);
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switch ($subnetMask % 4) {
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case 0:
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break;
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case 1:
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$addr .= "8";
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break;
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case 2:
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$addr .= "c";
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break;
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case 3:
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$addr .= "e";
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break;
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}
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$addr = str_pad($addr, 32, '0');
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$addr = pack("H*", $addr);
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$binMask = $addr;
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return ($address & $binMask) == $subnetAddress;
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}
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/**
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* Check if the REMOTE_ADDR is on Cloudflare's network.
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* @return boolean true if it is, otherwise false
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*/
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function validateCloudflare() {
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if (filter_var($_SERVER["REMOTE_ADDR"], FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
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// Using IPv6
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$cloudflare_ips_v6 = [
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"2400:cb00::/32",
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"2405:8100::/32",
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"2405:b500::/32",
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"2606:4700::/32",
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"2803:f800::/32",
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"2c0f:f248::/32",
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"2a06:98c0::/29"
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];
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$valid = false;
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foreach ($cloudflare_ips_v6 as $cidr) {
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if (ip6_in_cidr($_SERVER["REMOTE_ADDR"], $cidr)) {
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$valid = true;
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break;
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}
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}
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} else {
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// Using IPv4
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$cloudflare_ips_v4 = [
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"103.21.244.0/22",
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"103.22.200.0/22",
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"103.31.4.0/22",
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"104.16.0.0/12",
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"108.162.192.0/18",
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"131.0.72.0/22",
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"141.101.64.0/18",
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"162.158.0.0/15",
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"172.64.0.0/13",
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"173.245.48.0/20",
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"188.114.96.0/20",
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"190.93.240.0/20",
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"197.234.240.0/22",
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"198.41.128.0/17"
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];
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$valid = false;
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foreach ($cloudflare_ips_v4 as $cidr) {
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if (ip4_in_cidr($_SERVER["REMOTE_ADDR"], $cidr)) {
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$valid = true;
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break;
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}
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}
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}
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return $valid;
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}
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/**
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* Makes a good guess at the client's real IP address.
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*
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* @return string Client IP or `0.0.0.0` if we can't find anything
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*/
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function getClientIP() {
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// If CloudFlare is in the mix, we should use it.
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// Check if the request is actually from CloudFlare before trusting it.
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if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
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if (validateCloudflare()) {
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return $_SERVER["HTTP_CF_CONNECTING_IP"];
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}
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}
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if (isset($_SERVER["REMOTE_ADDR"])) {
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return $_SERVER["REMOTE_ADDR"];
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}
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return "0.0.0.0"; // This will not happen unless we aren't a web server
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}
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