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"use strict";
const {isIP} = require("net");
const execa = require("execa");
const dests = new Set(["default", "0.0.0.0", "0.0.0.0/0", "::", "::/0"]);
const args = {
v4: ["-rn", "-f", "inet"],
v6: ["-rn", "-f", "inet6"],
};
const parse = stdout => {
let result;
(stdout || "").trim().split("\n").some(line => {
const [target, gateway, _, iface] = line.split(/ +/) || [];
if (dests.has(target) && 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("netstat", args[family]);
return parse(stdout);
};
const sync = family => {
const {stdout} = execa.sync("netstat", 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");