index.js
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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The SFC licenses this file
// to you 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.
'use strict';
var os = require('os');
function getLoInterface() {
var name;
if (process.platform === 'darwin') {
name = 'lo0';
} else if (process.platform === 'linux') {
name = 'lo';
}
return name ? os.networkInterfaces()[name] : null;
}
/**
* Queries the system network interfaces for an IP address.
* @param {boolean} loopback Whether to find a loopback address.
* @param {string=} opt_family The IP family (IPv4 or IPv6). Defaults to IPv4.
* @return {string} The located IP address or undefined.
*/
function getAddress(loopback, opt_family) {
var family = opt_family || 'IPv4';
var addresses = [];
var interfaces;
if (loopback) {
var lo = getLoInterface();
interfaces = lo ? [lo] : null;
}
interfaces = interfaces || os.networkInterfaces();
for (var key in interfaces) {
if (!interfaces.hasOwnProperty(key)) {
continue;
}
interfaces[key].forEach(function(ipAddress) {
if (ipAddress.family === family &&
ipAddress.internal === loopback) {
addresses.push(ipAddress.address);
}
});
}
return addresses[0];
}
// PUBLIC API
/**
* Retrieves the external IP address for this host.
* @param {string=} opt_family The IP family to retrieve. Defaults to "IPv4".
* @return {string} The IP address or undefined if not available.
*/
exports.getAddress = function(opt_family) {
return getAddress(false, opt_family);
};
/**
* Retrieves a loopback address for this machine.
* @param {string=} opt_family The IP family to retrieve. Defaults to "IPv4".
* @return {string} The IP address or undefined if not available.
*/
exports.getLoopbackAddress = function(opt_family) {
return getAddress(true, opt_family);
};