"use strict";
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const net = require("net");
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const os = require("os");
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const execa = require("execa");
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const dests = ["default", "0.0.0.0", "0.0.0.0/0", "::", "::/0"];
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const args = {
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v4: ["-rn", "-f", "inet"],
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v6: ["-rn", "-f", "inet6"],
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};
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// The IPv4 gateway is in column 3 in Darwin 19 (macOS 10.15 Catalina) and higher,
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// previously it was in column 5
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const v4IfaceColumn = parseInt(os.release()) >= 19 ? 3 : 5;
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const parse = (stdout, family) => {
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let result;
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(stdout || "").trim().split("\n").some(line => {
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const results = line.split(/ +/) || [];
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const target = results[0];
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const gateway = results[1];
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const iface = results[family === "v4" ? v4IfaceColumn : 3];
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if (dests.includes(target) && 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("netstat", 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("netstat", args[family]);
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return parse(stdout, family);
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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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