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57 lines
1.5 KiB
57 lines
1.5 KiB
"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 = async family => { |
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const {stdout} = await execa("ip", 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("ip", 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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