You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 

52 lines
1.3 KiB

"use strict";
const {isIP} = require("net");
const {release} = require("os");
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"],
};
// The IPv4 gateway is in column 3 in Darwin 19 (macOS 10.15 Catalina) and higher,
// previously it was in column 5
const v4IfaceColumn = parseInt(release()) >= 19 ? 3 : 5;
const parse = (stdout, family) => {
let result;
(stdout || "").trim().split("\n").some(line => {
const results = line.split(/ +/) || [];
const target = results[0];
const gateway = results[1];
const iface = results[family === "v4" ? v4IfaceColumn : 3];
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, family);
};
const sync = family => {
const {stdout} = execa.sync("netstat", 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");