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dnsbl.js
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dnsbl.js
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/**
* IP-based blocking
* Pokemon Showdown - http://pokemonshowdown.com/
*
* This file has various tools for IP parsing and IP-based blocking.
*
* These include DNSBLs: DNS-based blackhole lists, which list IPs known for
* running proxies, spamming, or other abuse.
*
* We also maintain our own database of datacenter IP ranges (usually
* proxies). These are taken from https://github.com/client9/ipcat
* but include our own database as well.
*
* @license MIT license
*/
'use strict';
const BLOCKLISTS = ['sbl.spamhaus.org', 'rbl.efnetrbl.org'];
const dns = require('dns');
const FS = require('./lib/fs');
let Dnsbl = module.exports;
/** @type {Map<string, string?>} */
let dnsblCache = Dnsbl.cache = new Map();
dnsblCache.set('127.0.0.1', null);
/**
* @param {string} ip
* @param {function(string?): void} callback
* @param {string} reversedIpDot
* @param {number} index
*/
function queryDnsblLoop(ip, callback, reversedIpDot, index) {
if (index >= BLOCKLISTS.length) {
// not in any blocklist
dnsblCache.set(ip, null);
callback(null);
return;
}
let blocklist = BLOCKLISTS[index];
dns.resolve4(reversedIpDot + blocklist, (err, addresses) => {
if (!err) {
// blocked
dnsblCache.set(ip, blocklist);
callback(blocklist);
return;
}
// not blocked, try next blocklist
queryDnsblLoop(ip, callback, reversedIpDot, index + 1);
});
}
/**
* Dnsbl.query(ip, callback)
*
* Calls callback(blocklist), where blocklist is the blocklist domain
* if the passed IP is in a blocklist, or boolean false if the IP is
* not in any blocklist.
*
* @param {string} ip
* @return {Promise<string?>}
*/
Dnsbl.query = function queryDnsbl(ip) {
if (dnsblCache.has(ip)) {
return Promise.resolve(dnsblCache.get(ip) || null);
}
let reversedIpDot = ip.split('.').reverse().join('.') + '.';
return new Promise((resolve, reject) => {
queryDnsblLoop(ip, resolve, reversedIpDot, 0);
});
};
/*********************************************************
* IP parsing
*********************************************************/
/**
* @param {string} ip
* @return {number}
*/
Dnsbl.ipToNumber = function (ip) {
let num = 0;
let parts = ip.split('.');
for (const part of parts) {
num *= 256;
num += parseInt(part);
}
return num;
};
/**
* @param {string} cidr
* @return {?[number, number]}
*/
Dnsbl.getCidrPattern = function (cidr) {
if (!cidr) return null;
let index = cidr.indexOf('/');
if (index <= 0) {
return [Dnsbl.ipToNumber(cidr), Dnsbl.ipToNumber(cidr)];
}
let low = Dnsbl.ipToNumber(cidr.slice(0, index));
let bits = parseInt(cidr.slice(index + 1));
// fun fact: this fails if bits <= 1 because JavaScript
// does << with signed int32s.
let high = low + (1 << (32 - bits)) - 1;
return [low, high];
};
/**
* @param {string} range
* @return {?[number, number]}
*/
Dnsbl.getRangePattern = function (range) {
if (!range) return null;
let index = range.indexOf(' - ');
if (index <= 0) {
return [Dnsbl.ipToNumber(range), Dnsbl.ipToNumber(range)];
}
let low = Dnsbl.ipToNumber(range.slice(0, index));
let high = Dnsbl.ipToNumber(range.slice(index + 3));
return [low, high];
};
/**
* @param {string} str
* @return {?[number, number]}
*/
Dnsbl.getPattern = function (str) {
if (!str) return null;
if (str.indexOf(' - ') > 0) return Dnsbl.getRangePattern(str);
return Dnsbl.getCidrPattern(str);
};
/**
* @param {string | string[]} cidr
* @return {[number, number][]}
*/
Dnsbl.cidrToPattern = function (cidr) {
if (!cidr || !cidr.length) {
return [];
}
if (typeof cidr === 'string') {
let pattern = Dnsbl.getCidrPattern(cidr);
if (!pattern) return [];
return [pattern];
}
// @ts-ignore
return cidr.map(Dnsbl.getCidrPattern).filter(x => x);
};
/**
* @param {string | string[]} range
* @return {[number, number][]}
*/
Dnsbl.rangeToPattern = function (range) {
if (!range || !range.length) {
return [];
}
if (typeof range === 'string') {
let pattern = Dnsbl.getRangePattern(range);
if (!pattern) return [];
return [pattern];
}
// @ts-ignore
return range.map(Dnsbl.getRangePattern).filter(x => x);
};
/**
* @param {number[][]} patterns
* @param {number} num
* @return {boolean}
*/
Dnsbl.checkPattern = function (patterns, num) {
for (const pattern of patterns) {
if (num >= pattern[0] && num <= pattern[1]) {
return true;
}
}
return false;
};
/**
* Returns a checker function for the passed IP range or array of
* ranges. The checker function returns true if its passed IP is
* in the range.
*
* @param {string | string[]} ranges
* @return {function(string): boolean}
*/
Dnsbl.checker = function (ranges) {
if (!ranges || !ranges.length) return () => false;
/** @type {[number, number][]} */
let patterns = [];
if (typeof ranges === 'string') {
let rangePatterns = Dnsbl.getPattern(ranges);
if (rangePatterns) patterns = [rangePatterns];
} else {
// @ts-ignore
patterns = ranges.map(Dnsbl.getPattern).filter(x => x);
}
return ip => Dnsbl.checkPattern(patterns, Dnsbl.ipToNumber(ip));
};
/*********************************************************
* Datacenter parsing
*********************************************************/
/**
* @param {string} url
* @return {string}
*/
Dnsbl.urlToHost = function (url) {
if (url.startsWith('http://')) url = url.slice(7);
if (url.startsWith('https://')) url = url.slice(8);
if (url.startsWith('www.')) url = url.slice(4);
let slashIndex = url.indexOf('/');
if (slashIndex > 0) url = url.slice(0, slashIndex);
return url;
};
/**@type {[number, number, string][]} */
Dnsbl.datacenters = [];
Dnsbl.loadDatacenters = async function () {
const data = await FS('config/datacenters.csv').readIfExists();
const rows = data.split('\n');
/**@type {[number, number, string][]} */
let datacenters = [];
for (const row of rows) {
if (!row) continue;
const rowSplit = row.split(',');
/**@type {[number, number, string]} */
const rowData = [
Dnsbl.ipToNumber(rowSplit[0]),
Dnsbl.ipToNumber(rowSplit[1]),
Dnsbl.urlToHost(rowSplit[3]),
];
datacenters.push(rowData);
}
Dnsbl.datacenters = datacenters;
};
let rangeTmobile = Dnsbl.cidrToPattern('172.32.0.0/11');
let rangeCenet = Dnsbl.cidrToPattern('27.111.64.0/21');
let rangeQlded = Dnsbl.cidrToPattern('203.104.0.0/20');
let rangeCathednet = Dnsbl.cidrToPattern('180.95.40.0/21');
let rangeTelefonica = Dnsbl.cidrToPattern('181.64.0.0/14');
let rangeStarhub = Dnsbl.cidrToPattern(['27.125.128.0/18', '58.96.192.0/18', '101.127.0.0/17', '116.88.0.0/17', '122.11.192.0/18', '182.19.128.0/17', '182.55.0.0/16', '183.90.0.0/17', '203.116.122.0/23']);
let rangeTelstra = Dnsbl.cidrToPattern('101.160.0.0/11');
let rangeOVHres = Dnsbl.rangeToPattern(['109.190.0.0 - 109.190.63.255', '109.190.64.0 - 109.190.127.255', '109.190.128.0 - 109.190.191.255', '109.190.192.0 - 109.190.255.255', '151.80.228.0 - 151.80.228.255', '178.32.37.0 - 178.32.37.255', '178.33.101.0 - 178.33.101.255', '185.15.68.0 - 185.15.69.255', '185.15.70.0 - 185.15.71.255']);
/**
* Will not reject; IPs with no RDNS entry will resolve to
* '[byte1].[byte2].unknown-nohost'.
*
* @param {string} ip
* @return {Promise<string>}
*/
Dnsbl.reverse = function reverseDns(ip) {
return new Promise((resolve, reject) => {
if (!ip) {
resolve('');
return;
}
let ipNumber = Dnsbl.ipToNumber(ip);
if (Dnsbl.checkPattern(rangeOVHres, ipNumber)) {
resolve('ovh.fr.res-nohost');
return;
}
for (const row of Dnsbl.datacenters) {
if (ipNumber >= row[0] && ipNumber <= row[1]) {
resolve(row[2] + '.proxy-nohost');
return;
}
}
if (ip.startsWith('106.76.') || ip.startsWith('106.77.') || ip.startsWith('106.78.') || ip.startsWith('106.79.') || ip.startsWith('112.110.') || ip.startsWith('27.97.') || ip.startsWith('49.15.') || ip.startsWith('49.14.') || ip.startsWith('1.187.')) {
resolve('ideacellular.mobile-nohost');
return;
}
if (Dnsbl.checkPattern(rangeTmobile, ipNumber) || ip.startsWith('149.254.')) {
resolve('tmobile.mobile-nohost');
return;
}
if (Dnsbl.checkPattern(rangeCenet, ipNumber) || Dnsbl.checkPattern(rangeQlded, ipNumber) || ip.startsWith('153.107.') || Dnsbl.checkPattern(rangeCathednet, ipNumber)) {
resolve('edu.au.res-nohost');
return;
}
if (ip.startsWith('179.7.')) {
resolve('claro.com.pe.mobile-nohost');
return;
}
if (ip.startsWith('190.') || Dnsbl.checkPattern(rangeTelefonica, ipNumber)) {
resolve('telefonica.net.pe.mobile-nohost');
return;
}
if (ip.startsWith('180.191.') || ip.startsWith('112.198.')) {
resolve('globe.com.ph.mobile-nohost');
return;
}
if (ip.startsWith('218.188.') || ip.startsWith('218.189.')) {
resolve('hgc.com.hk.mobile-nohost');
return;
}
if (ip.startsWith('172.242.') || ip.startsWith('172.243.')) {
resolve('viasat.com.mobile-nohost');
return;
}
if (ip.startsWith('201.141.')) {
resolve('cablevision.net.mx.mobile-nohost');
return;
}
if (Dnsbl.checkPattern(rangeStarhub, ipNumber)) {
resolve('starhub.com.mobile-nohost');
return;
}
if (ip.startsWith('202.12.94.') || ip.startsWith('202.12.95.')) {
resolve('nyp.edu.sg.res-nohost');
return;
}
if (ip.startsWith('64.150.')) {
resolve('illinois.net.res-nohost');
return;
}
if (ip.startsWith('147.129.')) {
resolve('ithaca.edu.res-nohost');
return;
}
if (ip.startsWith('189.204.')) {
resolve('bestel.com.mx.res-nohost');
return;
}
if (ip.startsWith('121.54.')) {
resolve('smart.com.ph.mobile-nohost');
return;
}
if (ip.startsWith('179.52.') || ip.startsWith('179.53.')) {
resolve('codetel.net.do.mobile-nohost');
return;
}
if (ip.startsWith('46.16.36.')) {
resolve('anchorfree.proxy-nohost');
return;
}
if (ip.startsWith('198.144.104.') || ip.startsWith('198.47.115.') || ip.startsWith('199.255.215.') || ip.startsWith('204.14.76.') || ip.startsWith('204.14.77.') || ip.startsWith('204.14.78.') || ip.startsWith('204.14.79.') || ip.startsWith('205.164.32.') || ip.startsWith('209.73.132.') || ip.startsWith('209.73.151.') || ip.startsWith('216.172.135.') || ip.startsWith('46.16.34.') || ip.startsWith('46.16.35.') || ip.startsWith('50.117.45.') || ip.startsWith('63.141.198.') || ip.startsWith('63.141.199.') || ip.startsWith('74.115.1.') || ip.startsWith('74.115.5.') || ip.startsWith('85.237.197.') || ip.startsWith('85.237.222.')) {
resolve('anchorfree.proxy-nohost');
return;
}
if (ip === '127.0.0.1') {
resolve('localhost');
return;
}
dns.reverse(ip, (err, hosts) => {
if (err) {
resolve('' + ip.split('.').slice(0, 2).join('.') + '.unknown-nohost');
return;
}
if (!hosts || !hosts[0]) {
if (ip.startsWith('50.')) {
resolve('comcast.net.res-nohost');
} else if (Dnsbl.checkPattern(rangeTelstra, ipNumber)) {
resolve('telstra.net.res-nohost');
} else {
resolve('' + ip.split('.').slice(0, 2).join('.') + '.unknown-nohost');
}
}
resolve(hosts[0]);
});
});
};