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rOACCT/node_modules/default-gateway/freebsd.js
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freebsd.js
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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");