| "use strict"; |
| |
| const net = require("net"); |
| const os = require("os"); |
| const execa = require("execa"); |
| |
| const args = { |
| v4: ["-4", "r"], |
| v6: ["-6", "r"], |
| }; |
| |
| const parse = (stdout, family) => { |
| let result; |
| |
| (stdout || "").trim().split("\n").some(line => { |
| const results = /default( via .+?)?( dev .+?)( |$)/.exec(line) || []; |
| const gateway = (results[1] || "").substring(5); |
| const iface = (results[2] || "").substring(5); |
| if (gateway && net.isIP(gateway)) { // default via 1.2.3.4 dev en0 |
| result = {gateway, interface: (iface ? iface : null)}; |
| return true; |
| } else if (iface && !gateway) { // default via dev en0 |
| const interfaces = os.networkInterfaces(); |
| const addresses = interfaces[iface]; |
| if (!addresses || !addresses.length) return; |
| |
| addresses.some(addr => { |
| if (addr.family.substring(2) === family && net.isIP(addr.address)) { |
| result = {gateway: addr.address, interface: (iface ? iface : null)}; |
| return true; |
| } |
| }); |
| } |
| }); |
| |
| if (!result) { |
| throw new Error("Unable to determine default gateway"); |
| } |
| |
| return result; |
| }; |
| |
| const promise = family => { |
| return execa.stdout("ip", args[family]).then(stdout => { |
| return parse(stdout, family); |
| }); |
| }; |
| |
| const sync = family => { |
| const result = execa.sync("ip", args[family]); |
| return parse(result.stdout, family); |
| }; |
| |
| module.exports.v4 = () => promise("v4"); |
| module.exports.v6 = () => promise("v6"); |
| |
| module.exports.v4.sync = () => sync("v4"); |
| module.exports.v6.sync = () => sync("v6"); |