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"use strict";
const {isIP} = require("net");
const {networkInterfaces} = 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 && 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 = networkInterfaces();
const addresses = interfaces[iface];
if (!addresses || !addresses.length) return;
addresses.some(addr => {
if (addr.family.substring(2) === family && 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 = 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, family);
};
module.exports.v4 = () => promise("v4");
module.exports.v6 = () => promise("v6");
module.exports.v4.sync = () => sync("v4");
module.exports.v6.sync = () => sync("v6");