'use strict';
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const os = require('os');
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const defaultGateway = require('default-gateway');
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const ipaddr = require('ipaddr.js');
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function findIp(gateway) {
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const interfaces = os.networkInterfaces();
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const gatewayIp = ipaddr.parse(gateway);
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let ip;
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// Look for the matching interface in all local interfaces
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Object.keys(interfaces).some(name => {
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return interfaces[name].some(addr => {
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const prefix = ipaddr.parse(addr.netmask).prefixLengthFromSubnetMask();
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const net = ipaddr.parseCIDR(`${addr.address}/${prefix}`);
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if (net[0] && net[0].kind() === gatewayIp.kind() && gatewayIp.match(net)) {
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ip = net[0].toString();
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}
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return Boolean(ip);
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});
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});
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return ip;
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}
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function promise(family) {
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return defaultGateway[family]().then(result => {
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return findIp(result.gateway) || null;
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}).catch(() => null);
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}
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function sync(family) {
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try {
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const result = defaultGateway[family].sync();
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return findIp(result.gateway) || null;
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} catch (error) {
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return null;
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}
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}
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const internalIp = {};
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internalIp.v6 = () => promise('v6');
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internalIp.v4 = () => promise('v4');
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internalIp.v6.sync = () => sync('v6');
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internalIp.v4.sync = () => sync('v4');
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module.exports = internalIp;
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// TODO: Remove this for the next major release
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module.exports.default = internalIp;
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