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"use strict";
const {isIP} = require("net");
const execa = require("execa");
const args = {
v4: ["-4", "r"],
v6: ["-6", "r"],
};
const parse = stdout => {
let result;
(stdout || "").trim().split("\n").some(line => {
const [_, gateway, iface] = /default via (.+?) dev (.+?)( |$)/.exec(line) || [];
if (gateway && isIP(gateway)) {
result = {gateway, interface: (iface ? iface : null)};
return true;
}
});
if (!result) {
throw new Error("Unable to determine default gateway");
}
return result;
};
const promise = async family => {
const {stdout} = await execa("ip", args[family]);
return parse(stdout, family);
};
const sync = family => {
const {stdout} = execa.sync("ip", args[family]);
return parse(stdout);
};
module.exports.v4 = () => promise("v4");
module.exports.v6 = () => promise("v6");
module.exports.v4.sync = () => sync("v4");
module.exports.v6.sync = () => sync("v6");