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