79 lines
2.2 KiB
JavaScript
79 lines
2.2 KiB
JavaScript
"use strict";
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const execa = require("execa");
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const ipRegex = require("ip-regex");
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const os = require("os");
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const gwArgs = "path Win32_NetworkAdapterConfiguration where IPEnabled=true get DefaultIPGateway,Index /format:table".split(" ");
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const ifArgs = index => `path Win32_NetworkAdapter where Index=${index} get NetConnectionID,MACAddress /format:table`.split(" ");
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const spawnOpts = {
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windowsHide: true,
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};
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function parseGwTable(gwTable, family) {
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for (const line of (gwTable || "").trim().split("\n").splice(1)) {
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const [gw, id] = line.trim().split(/} +/) || [];
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const gateway = (ipRegex[family]().exec((gw || "").trim()) || [])[0];
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if (gateway) return [gateway, id];
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}
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}
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function parseIfTable(ifTable) {
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const line = (ifTable || "").trim().split("\n")[1];
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let [mac, name] = line.trim().split(/\s+/);
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mac = mac.toLowerCase();
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// try to get the interface name by matching the mac to os.networkInterfaces to avoid wmic's encoding issues
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// https://github.com/silverwind/default-gateway/issues/14
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for (const [osname, addrs] of Object.entries(os.networkInterfaces())) {
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for (const addr of addrs) {
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if (addr && addr.mac === mac) {
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return osname;
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}
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}
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}
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return name;
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}
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const promise = async family => {
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const gwTable = await execa.stdout("wmic", gwArgs, spawnOpts);
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const [gateway, id] = parseGwTable(gwTable, family) || [];
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if (!gateway) {
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throw new Error("Unable to determine default gateway");
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}
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let name;
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if (id) {
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const ifTable = await execa.stdout("wmic", ifArgs(id), spawnOpts);
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name = parseIfTable(ifTable);
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}
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return {gateway, interface: name ? name : null};
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};
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const sync = family => {
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const gwTable = execa.sync("wmic", gwArgs, spawnOpts).stdout;
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const [gateway, id] = parseGwTable(gwTable, family) || [];
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if (!gateway) {
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throw new Error("Unable to determine default gateway");
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}
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let name;
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if (id) {
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const ifTable = execa.sync("wmic", ifArgs(id), spawnOpts).stdout;
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name = parseIfTable(ifTable);
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}
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return {gateway, interface: name ? name : null};
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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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