46 lines
1 KiB
JavaScript
46 lines
1 KiB
JavaScript
|
"use strict";
|
||
|
|
|
||
|
|
const net = require("net");
|
||
|
|
const execa = require("execa");
|
||
|
|
const dests = ["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.includes(target) && gateway && net.isIP(gateway)) {
|
||
|
|
result = {gateway, interface: (iface ? iface : null)};
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
if (!result) {
|
||
|
|
throw new Error("Unable to determine default gateway");
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
};
|
||
|
|
|
||
|
|
const promise = family => {
|
||
|
|
return execa.stdout("netstat", args[family]).then(stdout => {
|
||
|
|
return parse(stdout);
|
||
|
|
});
|
||
|
|
};
|
||
|
|
|
||
|
|
const sync = family => {
|
||
|
|
const result = execa.sync("netstat", args[family]);
|
||
|
|
return parse(result.stdout);
|
||
|
|
};
|
||
|
|
|
||
|
|
module.exports.v4 = () => promise("v4");
|
||
|
|
module.exports.v6 = () => promise("v6");
|
||
|
|
|
||
|
|
module.exports.v4.sync = () => sync("v4");
|
||
|
|
module.exports.v6.sync = () => sync("v6");
|