/*---------------------------------------------------------------------------------------------

* Copyright (c) Microsoft Corporation. All rights reserved.

* Licensed under the MIT License. See License.txt in the project root for license information.

*--------------------------------------------------------------------------------------------*/

import { exec } from 'child_process';

import { isWindows } from 'vs/base/common/platform';

const cmdline = {

windows: 'getmac.exe',

unix: '/sbin/ifconfig -a || /sbin/ip link'

};

const invalidMacAddresses = new Set([

'00:00:00:00:00:00',

'ff:ff:ff:ff:ff:ff',

'ac:de:48:00:11:22'

]);

function validateMacAddress(candidate: string): boolean {

const tempCandidate = candidate.replace(/\-/g, ':').toLowerCase();

return !invalidMacAddresses.has(tempCandidate);

}

export function getMac(): Promise<string> {

return new Promise(async (resolve, reject) => {

const timeout = setTimeout(() => reject('Unable to retrieve mac address (timeout after 10s)'), 10000);

try {

resolve(await doGetMac());

} catch (error) {

reject(error);

} finally {

clearTimeout(timeout);

}

});

}

function doGetMac(): Promise<string> {

return new Promise((resolve, reject) => {

try {

exec(isWindows ? cmdline.windows : cmdline.unix, { timeout: 10000 }, (err, stdout, stdin) => {

if (err) {

return reject(`Unable to retrieve mac address (${err.toString()})`);

} else {

const regex = /(?:[a-f\d]{2}[:\-]){5}[a-f\d]{2}/gi;

let match;

while ((match = regex.exec(stdout)) !== null) {

const macAddressCandidate = match[0];

if (validateMacAddress(macAddressCandidate)) {

return resolve(macAddressCandidate);

}

}

return reject('Unable to retrieve mac address (unexpected format)');

}

});

} catch (err) {

reject(err);

}

});

}