/*
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* portfinder.js: A simple tool to find an open port on the current machine.
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*
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* (C) 2011, Charlie Robbins
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*
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*/
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"use strict";
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var fs = require('fs'),
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os = require('os'),
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net = require('net'),
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path = require('path'),
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_async = require('async'),
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debug = require('debug'),
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mkdirp = require('mkdirp').mkdirp;
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var debugTestPort = debug('portfinder:testPort'),
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debugGetPort = debug('portfinder:getPort'),
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debugDefaultHosts = debug('portfinder:defaultHosts');
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var internals = {};
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internals.testPort = function(options, callback) {
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if (!callback) {
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callback = options;
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options = {};
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}
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options.server = options.server || net.createServer(function () {
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//
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// Create an empty listener for the port testing server.
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//
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});
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debugTestPort("entered testPort(): trying", options.host, "port", options.port);
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function onListen () {
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debugTestPort("done w/ testPort(): OK", options.host, "port", options.port);
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options.server.removeListener('error', onError);
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options.server.close();
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callback(null, options.port);
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}
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function onError (err) {
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debugTestPort("done w/ testPort(): failed", options.host, "w/ port", options.port, "with error", err.code);
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options.server.removeListener('listening', onListen);
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if (!(err.code == 'EADDRINUSE' || err.code == 'EACCES')) {
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return callback(err);
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}
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var nextPort = exports.nextPort(options.port);
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if (nextPort > exports.highestPort) {
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return callback(new Error('No open ports available'));
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}
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internals.testPort({
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port: nextPort,
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host: options.host,
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server: options.server
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}, callback);
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}
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options.server.once('error', onError);
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options.server.once('listening', onListen);
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if (options.host) {
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options.server.listen(options.port, options.host);
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} else {
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/*
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Judgement of service without host
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example:
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express().listen(options.port)
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*/
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options.server.listen(options.port);
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}
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};
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//
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// ### @basePort {Number}
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// The lowest port to begin any port search from
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//
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exports.basePort = 8000;
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//
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// ### function setBasePort (port)
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// #### @port {Number} The new base port
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//
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exports.setBasePort = function (port) {
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exports.basePort = port;
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}
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//
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// ### @highestPort {Number}
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// Largest port number is an unsigned short 2**16 -1=65335
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//
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exports.highestPort = 65535;
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//
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// ### function setHighestPort (port)
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// #### @port {Number} The new highest port
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//
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exports.setHighestPort = function (port) {
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exports.highestPort = port;
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}
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//
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// ### @basePath {string}
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// Default path to begin any socket search from
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//
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exports.basePath = '/tmp/portfinder'
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//
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// ### function getPort (options, callback)
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// #### @options {Object} Settings to use when finding the necessary port
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// #### @callback {function} Continuation to respond to when complete.
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// Responds with a unbound port on the current machine.
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//
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exports.getPort = function (options, callback) {
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if (!callback) {
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callback = options;
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options = {};
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}
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options.port = Number(options.port) || Number(exports.basePort);
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options.host = options.host || null;
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options.stopPort = Number(options.stopPort) || Number(exports.highestPort);
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if(!options.startPort) {
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options.startPort = Number(options.port);
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if(options.startPort < 0) {
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throw Error('Provided options.startPort(' + options.startPort + ') is less than 0, which are cannot be bound.');
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}
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if(options.stopPort < options.startPort) {
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throw Error('Provided options.stopPort(' + options.stopPort + 'is less than options.startPort (' + options.startPort + ')');
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}
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}
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if (options.host) {
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if (exports._defaultHosts.indexOf(options.host) !== -1) {
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exports._defaultHosts.push(options.host)
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}
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}
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var openPorts = [], currentHost;
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return _async.eachSeries(exports._defaultHosts, function(host, next) {
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debugGetPort("in eachSeries() iteration callback: host is", host);
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return internals.testPort({ host: host, port: options.port }, function(err, port) {
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if (err) {
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debugGetPort("in eachSeries() iteration callback testPort() callback", "with an err:", err.code);
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currentHost = host;
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return next(err);
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} else {
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debugGetPort("in eachSeries() iteration callback testPort() callback",
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"with a success for port", port);
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openPorts.push(port);
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return next();
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}
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});
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}, function(err) {
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if (err) {
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debugGetPort("in eachSeries() result callback: err is", err);
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// If we get EADDRNOTAVAIL it means the host is not bindable, so remove it
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// from exports._defaultHosts and start over. For ubuntu, we use EINVAL for the same
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if (err.code === 'EADDRNOTAVAIL' || err.code === 'EINVAL') {
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if (options.host === currentHost) {
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// if bad address matches host given by user, tell them
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//
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// NOTE: We may need to one day handle `my-non-existent-host.local` if users
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// report frustration with passing in hostnames that DONT map to bindable
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// hosts, without showing them a good error.
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var msg = 'Provided host ' + options.host + ' could NOT be bound. Please provide a different host address or hostname';
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return callback(Error(msg));
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} else {
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var idx = exports._defaultHosts.indexOf(currentHost);
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exports._defaultHosts.splice(idx, 1);
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return exports.getPort(options, callback);
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}
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} else {
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// error is not accounted for, file ticket, handle special case
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return callback(err);
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}
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}
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// sort so we can compare first host to last host
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openPorts.sort(function(a, b) {
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return a - b;
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});
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debugGetPort("in eachSeries() result callback: openPorts is", openPorts);
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if (openPorts[0] === openPorts[openPorts.length-1]) {
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// if first === last, we found an open port
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if(openPorts[0] <= options.stopPort) {
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return callback(null, openPorts[0]);
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}
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else {
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var msg = 'No open ports found in between '+ options.startPort + ' and ' + options.stopPort;
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return callback(Error(msg));
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}
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} else {
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// otherwise, try again, using sorted port, aka, highest open for >= 1 host
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return exports.getPort({ port: openPorts.pop(), host: options.host, startPort: options.startPort, stopPort: options.stopPort }, callback);
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}
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});
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};
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//
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// ### function getPortPromise (options)
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// #### @options {Object} Settings to use when finding the necessary port
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// Responds a promise to an unbound port on the current machine.
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//
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exports.getPortPromise = function (options) {
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if (typeof Promise !== 'function') {
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throw Error('Native promise support is not available in this version of node.' +
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'Please install a polyfill and assign Promise to global.Promise before calling this method');
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}
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if (!options) {
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options = {};
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}
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return new Promise(function(resolve, reject) {
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exports.getPort(options, function(err, port) {
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if (err) {
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return reject(err);
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}
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resolve(port);
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});
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});
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}
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//
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// ### function getPorts (count, options, callback)
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// #### @count {Number} The number of ports to find
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// #### @options {Object} Settings to use when finding the necessary port
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// #### @callback {function} Continuation to respond to when complete.
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// Responds with an array of unbound ports on the current machine.
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//
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exports.getPorts = function (count, options, callback) {
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if (!callback) {
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callback = options;
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options = {};
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}
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var lastPort = null;
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_async.timesSeries(count, function(index, asyncCallback) {
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if (lastPort) {
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options.port = exports.nextPort(lastPort);
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}
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exports.getPort(options, function (err, port) {
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if (err) {
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asyncCallback(err);
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} else {
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lastPort = port;
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asyncCallback(null, port);
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}
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});
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}, callback);
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};
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//
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// ### function getSocket (options, callback)
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// #### @options {Object} Settings to use when finding the necessary port
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// #### @callback {function} Continuation to respond to when complete.
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// Responds with a unbound socket using the specified directory and base
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// name on the current machine.
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//
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exports.getSocket = function (options, callback) {
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if (!callback) {
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callback = options;
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options = {};
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}
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options.mod = options.mod || parseInt(755, 8);
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options.path = options.path || exports.basePath + '.sock';
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//
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// Tests the specified socket
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//
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function testSocket () {
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fs.stat(options.path, function (err) {
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//
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// If file we're checking doesn't exist (thus, stating it emits ENOENT),
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// we should be OK with listening on this socket.
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//
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if (err) {
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if (err.code == 'ENOENT') {
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callback(null, options.path);
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}
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else {
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callback(err);
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}
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}
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else {
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//
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// This file exists, so it isn't possible to listen on it. Lets try
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// next socket.
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//
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options.path = exports.nextSocket(options.path);
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exports.getSocket(options, callback);
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}
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});
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}
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//
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// Create the target `dir` then test connection
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// against the socket.
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//
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function createAndTestSocket (dir) {
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mkdirp(dir, options.mod, function (err) {
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if (err) {
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return callback(err);
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}
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options.exists = true;
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testSocket();
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});
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}
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//
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// Check if the parent directory of the target
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// socket path exists. If it does, test connection
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// against the socket. Otherwise, create the directory
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// then test connection.
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//
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function checkAndTestSocket () {
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var dir = path.dirname(options.path);
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fs.stat(dir, function (err, stats) {
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if (err || !stats.isDirectory()) {
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return createAndTestSocket(dir);
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}
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options.exists = true;
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testSocket();
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});
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}
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//
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// If it has been explicitly stated that the
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// target `options.path` already exists, then
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// simply test the socket.
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//
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return options.exists
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? testSocket()
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: checkAndTestSocket();
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};
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//
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// ### function nextPort (port)
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// #### @port {Number} Port to increment from.
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// Gets the next port in sequence from the
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// specified `port`.
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//
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exports.nextPort = function (port) {
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return port + 1;
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};
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//
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// ### function nextSocket (socketPath)
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// #### @socketPath {string} Path to increment from
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// Gets the next socket path in sequence from the
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// specified `socketPath`.
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//
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exports.nextSocket = function (socketPath) {
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var dir = path.dirname(socketPath),
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name = path.basename(socketPath, '.sock'),
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match = name.match(/^([a-zA-z]+)(\d*)$/i),
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index = parseInt(match[2]),
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base = match[1];
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if (isNaN(index)) {
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index = 0;
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}
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index += 1;
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return path.join(dir, base + index + '.sock');
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};
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/**
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* @desc List of internal hostnames provided by your machine. A user
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* provided hostname may also be provided when calling portfinder.getPort,
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* which would then be added to the default hosts we lookup and return here.
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*
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* @return {array}
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*
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* Long Form Explantion:
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*
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* - Input: (os.networkInterfaces() w/ MacOS 10.11.5+ and running a VM)
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*
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* { lo0:
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* [ { address: '::1',
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* netmask: 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff',
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* family: 'IPv6',
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* mac: '00:00:00:00:00:00',
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* scopeid: 0,
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* internal: true },
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* { address: '127.0.0.1',
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* netmask: '255.0.0.0',
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* family: 'IPv4',
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* mac: '00:00:00:00:00:00',
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* internal: true },
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* { address: 'fe80::1',
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* netmask: 'ffff:ffff:ffff:ffff::',
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* family: 'IPv6',
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* mac: '00:00:00:00:00:00',
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* scopeid: 1,
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* internal: true } ],
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* en0:
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* [ { address: 'fe80::a299:9bff:fe17:766d',
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* netmask: 'ffff:ffff:ffff:ffff::',
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* family: 'IPv6',
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* mac: 'a0:99:9b:17:76:6d',
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* scopeid: 4,
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* internal: false },
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* { address: '10.0.1.22',
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* netmask: '255.255.255.0',
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* family: 'IPv4',
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* mac: 'a0:99:9b:17:76:6d',
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* internal: false } ],
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* awdl0:
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* [ { address: 'fe80::48a8:37ff:fe34:aaef',
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* netmask: 'ffff:ffff:ffff:ffff::',
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* family: 'IPv6',
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* mac: '4a:a8:37:34:aa:ef',
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* scopeid: 8,
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* internal: false } ],
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* vnic0:
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* [ { address: '10.211.55.2',
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* netmask: '255.255.255.0',
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* family: 'IPv4',
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* mac: '00:1c:42:00:00:08',
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* internal: false } ],
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* vnic1:
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* [ { address: '10.37.129.2',
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* netmask: '255.255.255.0',
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* family: 'IPv4',
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* mac: '00:1c:42:00:00:09',
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* internal: false } ] }
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*
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* - Output:
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*
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* [
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* '0.0.0.0',
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* '::1',
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* '127.0.0.1',
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* 'fe80::1',
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* '10.0.1.22',
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* 'fe80::48a8:37ff:fe34:aaef',
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* '10.211.55.2',
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* '10.37.129.2'
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* ]
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*
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* Note we export this so we can use it in our tests, otherwise this API is private
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*/
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exports._defaultHosts = (function() {
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var interfaces = {};
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try{
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interfaces = os.networkInterfaces();
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}
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catch(e) {
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// As of October 2016, Windows Subsystem for Linux (WSL) does not support
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// the os.networkInterfaces() call and throws instead. For this platform,
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// assume 0.0.0.0 as the only address
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//
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// - https://github.com/Microsoft/BashOnWindows/issues/468
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//
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// - Workaround is a mix of good work from the community:
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// - https://github.com/http-party/node-portfinder/commit/8d7e30a648ff5034186551fa8a6652669dec2f2f
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// - https://github.com/yarnpkg/yarn/pull/772/files
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if (e.syscall === 'uv_interface_addresses') {
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// swallow error because we're just going to use defaults
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// documented @ https://github.com/nodejs/node/blob/4b65a65e75f48ff447cabd5500ce115fb5ad4c57/doc/api/net.md#L231
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} else {
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throw e;
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}
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}
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var interfaceNames = Object.keys(interfaces),
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hiddenButImportantHost = '0.0.0.0', // !important - dont remove, hence the naming :)
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results = [hiddenButImportantHost];
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for (var i = 0; i < interfaceNames.length; i++) {
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var _interface = interfaces[interfaceNames[i]];
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for (var j = 0; j < _interface.length; j++) {
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var curr = _interface[j];
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results.push(curr.address);
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}
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}
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// add null value, For createServer function, do not use host.
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results.push(null);
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debugDefaultHosts("exports._defaultHosts is: %o", results);
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return results;
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}());
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