1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | 4x 4x 4x 4x 4x 4x 4x 52x 52x 52x 17x 17x 4x 3x 4x 3x 1x 1x 3x 3x 3x 4x 4x 1x 3x 3x 3x 3x 1x 3x 4x 3x 3x 1x 2x 1x 1x 1x 1x 1x 1x 4x 1x 4x 5x 6x 5x 5x 1x 1x 4x 1x 1x 3x 3x 1x 1x 2x 2x 2x 2x 2x 1x 1x 1x 1x 1x 1x 50x 50x 50x 50x | 'use strict'; const dns = require('dns'); const async = require('async'); const fs = require('fs'); const path = require('path'); const EOL = /\r?\n/g; const dictionariesPath = path.join(__dirname, '../dictionary'); /** * Resolve the domain ip address and nameservers * @param {String} subdomain The subdomain to test * @param {String} tld The hostname tld * @param {Function} cb The callback to run once has done */ exports.probeDNS = (subdomain, tld, cb) => { // Build the domain name const domain = `${subdomain}.${tld}`; // Run the resolve request async.series({ address: next => { dns.resolve(domain, 'A', next); }, nameserver: next => { dns.resolve(domain, 'NS', (err, res) => { next(null, err ? null : res); }); } }, cb); }; /** * Return the default DNS servers * @return {Array} An array of DNS used by the module */ exports.getDefaultResolvers = function () { return fs.readFileSync( path.join(__dirname, 'resolvers.txt') ).toString().trim().split(EOL); }; // Check whether a dns server is valid. exports.isValidDnsServer = function (dnsServer, timeout, cb) { // Ensure arguments are good if (typeof timeout === 'function') { cb = timeout; timeout = 4000; } // Set custom callback handler let called = false; let timeoutPromise = null; let dnsCallback = err => { clearTimeout(timeoutPromise); if (called) { return; } called = true; cb(err); }; // Force to use this dns server dns.setServers([dnsServer]); // Set a custom timeout for DNS request timeoutPromise = setTimeout(() => { dnsCallback(new Error('Request timeout exceeded!')); }, timeout); // Try to resolve google.com dns.resolve4('www.google.com', dnsCallback); }; /** * Get the best resolver in the following order: * 1. User supplied. * 2. From our list. * @param {String} server The DNS server address as string * @param {function} callback The callback to run once has done */ exports.getResolvers = function (server, callback) { // Results array let dnsServers = exports.getDefaultResolvers(); // Return default dns servers if (typeof server === 'undefined') { callback(dnsServers); // Return default dns servers } else if (typeof server === 'function') { callback = server; callback(dnsServers); // Validate custom DNS server than add to resolvers list } else { exports.isValidDnsServer(server, 4000, err => { Eif (err === null && dnsServers.indexOf(server) === -1) { dnsServers.unshift(server); } callback(dnsServers); }); } }; /** * Get the dictionary files names * @return {Array} Array of file names */ exports.getDictionaryNames = function () { return fs.readdirSync(dictionariesPath); }; // Send requests to a DNS resolver and find valid sub-domains exports.getSubDomains = function (options, callback = () => {}) { // Default subdomain scan options let defaults = { dictionary: 'top_50' }; // Clean undefined options Object.keys(options).forEach(key => options[key] === undefined && delete options[key]); // Extend default options with user defined ones options = Object.assign({}, defaults, options); // Exit if no host option if (!options.host) { callback(new Error('The host property is missing.')); return; } // Optionally run a bing search if (options.bingSearch === true) { var bingSearch = require('./bingSearch.js'); return bingSearch.find(options.host, callback); } // Build dictionary file path and test for existence let dictionaryPath = path.join(dictionariesPath, `${options.dictionary}.txt`); if (!fs.existsSync(dictionaryPath)) { callback(new Error(`The dictionary file ${options.dictionary} does not exist.`)); return; } async.waterfall([ cb => { let wildcard = Math.floor(Math.random() * 1e14) + 1e15; exports.probeDNS(wildcard, options.host, err => { cb(null, err ? null : true); }); }, (wildcard, cb) => { // If wildcard is enabled return it and stop if (wildcard) { cb(null, ['*']); return; } // Get the resolvers list exports.getResolvers(options.dnsServer, servers => { // Set new servers list for the requests dns.setServers(servers); // Get dictionary content and split lines in array rows let dictionary = fs.readFileSync(dictionaryPath).toString().trim().split(EOL); // Probe each subdomain async.mapSeries(dictionary, (subdomain, next) => { let hostname = `${subdomain}.${options.host}`; exports.probeDNS(subdomain, options.host, (err, res) => { next(null, err ? null : Object.assign(res, {hostname})); }); }, (err, results) => { // Clear from empty results cb(err, results.filter(v => v)); }); }); } ], callback); }; |