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44 lines
1.0 KiB
44 lines
1.0 KiB
"use strict"; |
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const {isIP} = require("net"); |
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const execa = require("execa"); |
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const dests = new Set(["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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const parse = stdout => { |
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let result; |
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(stdout || "").trim().split("\n").some(line => { |
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const [target, gateway, _, iface] = line.split(/ +/) || []; |
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if (dests.has(target) && gateway && 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); |
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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); |
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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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