118 lines
3.4 KiB
JavaScript
118 lines
3.4 KiB
JavaScript
// Licensed to the Software Freedom Conservancy (SFC) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The SFC licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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'use strict';
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var os = require('os');
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function getLoInterface() {
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var name;
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if (process.platform === 'darwin') {
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name = 'lo0';
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} else if (process.platform === 'linux') {
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name = 'lo';
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}
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return name ? os.networkInterfaces()[name] : null;
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}
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/**
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* Queries the system network interfaces for an IP address.
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* @param {boolean} loopback Whether to find a loopback address.
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* @param {string=} opt_family The IP family (IPv4 or IPv6). Defaults to IPv4.
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* @return {string} The located IP address or undefined.
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*/
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function getAddress(loopback, opt_family) {
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var family = opt_family || 'IPv4';
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var addresses = [];
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var interfaces;
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if (loopback) {
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var lo = getLoInterface();
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interfaces = lo ? [lo] : null;
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}
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interfaces = interfaces || os.networkInterfaces();
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for (var key in interfaces) {
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if (!interfaces.hasOwnProperty(key)) {
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continue;
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}
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interfaces[key].forEach(function(ipAddress) {
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if (ipAddress.family === family &&
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ipAddress.internal === loopback) {
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addresses.push(ipAddress.address);
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}
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});
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}
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return addresses[0];
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}
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// PUBLIC API
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/**
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* Retrieves the external IP address for this host.
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* @param {string=} opt_family The IP family to retrieve. Defaults to "IPv4".
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* @return {string} The IP address or undefined if not available.
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*/
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exports.getAddress = function(opt_family) {
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return getAddress(false, opt_family);
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};
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/**
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* Retrieves a loopback address for this machine.
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* @param {string=} opt_family The IP family to retrieve. Defaults to "IPv4".
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* @return {string} The IP address or undefined if not available.
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*/
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exports.getLoopbackAddress = function(opt_family) {
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return getAddress(true, opt_family);
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};
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/**
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* Splits a hostport string, e.g. "www.example.com:80", into its component
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* parts.
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*
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* @param {string} hostport The string to split.
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* @return {{host: string, port: ?number}} A host and port. If no port is
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* present in the argument `hostport`, port is null.
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*/
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exports.splitHostAndPort = function(hostport) {
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let lastIndex = hostport.lastIndexOf(':');
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if (lastIndex < 0) {
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return {host: hostport, port: null};
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}
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let firstIndex = hostport.indexOf(':');
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if (firstIndex != lastIndex && !hostport.includes('[')) {
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// Multiple colons but no brackets, so assume the string is an IPv6 address
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// with no port (e.g. "1234:5678:9:0:1234:5678:9:0").
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return {host: hostport, port: null};
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}
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let host = hostport.slice(0, lastIndex);
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if (host.startsWith('[') && host.endsWith(']')) {
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host = host.slice(1, -1);
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}
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let port = parseInt(hostport.slice(lastIndex + 1), 10);
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return {host, port};
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};
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