59 lines
1.5 KiB
JavaScript
Executable file
59 lines
1.5 KiB
JavaScript
Executable file
"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 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, family) => {
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let result;
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(stdout || "").trim().split("\n").some(line => {
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const results = /default( via .+?)?( dev .+?)( |$)/.exec(line) || [];
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const gateway = (results[1] || "").substring(5);
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const iface = (results[2] || "").substring(5);
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if (gateway && net.isIP(gateway)) { // default via 1.2.3.4 dev en0
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result = {gateway, interface: (iface ? iface : null)};
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return true;
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} else if (iface && !gateway) { // default via dev en0
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const interfaces = os.networkInterfaces();
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const addresses = interfaces[iface];
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if (!addresses || !addresses.length) return;
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addresses.some(addr => {
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if (addr.family.substring(2) === family && net.isIP(addr.address)) {
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result = {gateway: addr.address, interface: (iface ? iface : null)};
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return true;
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}
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});
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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 = family => {
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return execa.stdout("ip", args[family]).then(stdout => {
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return parse(stdout, family);
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});
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};
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const sync = family => {
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const result = execa.sync("ip", args[family]);
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return parse(result.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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