fetch-blacklist

#!/usr/bin/env php
<?php
/* Copyright 2024 Romain "Artefact2" Dal Maso <romain.dalmaso@artefact2.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

function is_v6(string $ip): bool {
	return strpos($ip, ':') !== false;
}

function process(string $uri, array &$list): void {
	$f = fopen($uri, 'rb');
	while($line = fgets($f)) {
		$line = explode('/', trim($line));
		if(count($line) === 1) {
			if(is_v6($line[0])) {
				$line[] = '128';
			} else {
				$line[] = '32';
			}
		}
		list($ip, $mask) = $line;
		$k = is_v6($ip) ? 'ipv6' : 'ipv4';
		$ip = inet_pton($ip);
		if($ip === false) continue;
		$list[$k][$ip] = (int)$mask;
	}
}

$list = [ 'ipv4' => [], 'ipv6' => [] ];
process('https://raw.githubusercontent.com/X4BNet/lists_vpn/main/output/datacenter/ipv4.txt', $list);
process('https://www.dan.me.uk/torlist/?exit', $list);
ksort($list['ipv4']);
ksort($list['ipv6']);

echo '<?php', PHP_EOL;
echo 'return function(string $ip): bool {';
echo     'static $list = ', var_export($list, true), ';';
echo     'static $walk = function(string $ip, int $bits, int $stop, array $list) {';
echo         'for($i = $bits; $i >= $stop; --$i) {';
echo             'if($i < $bits) { $byte = intdiv($i, 8); $bit = 7 - $i%8; $ip[$byte]=chr(ord($ip[$byte]) & (~(1<<$bit))); }';
echo             'if(($list[$ip] ?? -1) === $i) return true;';
echo         '}';
echo         'return false;';
echo     '};';
echo     'if(strpos($ip, ":") !== false) { return $walk(inet_pton($ip), 128, 128, $list["ipv6"]); }';
echo     'else { return $walk(inet_pton($ip), 32, 10, $list["ipv4"]); }';
echo '};', PHP_EOL;