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