88 lines
2.1 KiB
JavaScript
88 lines
2.1 KiB
JavaScript
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var dgram = require('dgram')
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, net = require('net')
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, Buffer = require('buffer').Buffer
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;
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var allocBuffer = Buffer.alloc ?
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function allocBuffer(s) { return Buffer.alloc(s) } :
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function allocBuffer(s) { return new Buffer(s) }
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var mac_bytes = 6;
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exports.createMagicPacket = function(mac) {
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var mac_buffer = allocBuffer(mac_bytes)
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, i
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;
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if (mac.length == 2 * mac_bytes + (mac_bytes - 1)) {
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mac = mac.replace(new RegExp(mac[2], 'g'), '');
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}
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if (mac.length != 2 * mac_bytes || mac.match(/[^a-fA-F0-9]/)) {
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throw new Error("malformed MAC address '" + mac + "'");
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}
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for (i = 0; i < mac_bytes; ++i) {
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mac_buffer[i] = parseInt(mac.substr(2 * i, 2), 16);
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}
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var num_macs = 16
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, buffer = allocBuffer((1 + num_macs) * mac_bytes);
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for (i = 0; i < mac_bytes; ++i) {
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buffer[i] = 0xff;
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}
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for (i = 0; i < num_macs; ++i) {
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mac_buffer.copy(buffer, (i + 1) * mac_bytes, 0, mac_buffer.length)
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}
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return buffer;
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};
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exports.wake = function(mac, opts, callback) {
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if (typeof opts === 'function') {
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callback = opts;
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opts = undefined;
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}
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opts = opts || {};
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var address = opts['address'] || '255.255.255.255'
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, num_packets = opts['num_packets'] || 3
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, interval = opts['interval'] || 100
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, port = opts['port'] || 9
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, magic_packet = exports.createMagicPacket(mac)
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, socket = dgram.createSocket(net.isIPv6(address) ? 'udp6' : 'udp4')
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, i = 0
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, timer_id
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;
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function post_write(error) {
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if (error || i === num_packets) {
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try {
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socket.close();
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} catch (ex) {
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error = error || ex;
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}
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if (timer_id) {
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clearTimeout(timer_id);
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}
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if (callback) {
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callback(error);
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}
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}
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}
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socket.on('error', post_write);
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function sendWoL() {
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i += 1;
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socket.send(magic_packet, 0, magic_packet.length, port, address, post_write);
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if (i < num_packets) {
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timer_id = setTimeout(sendWoL, interval);
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} else {
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timer_id = undefined;
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}
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}
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socket.once('listening', function() {
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socket.setBroadcast(true)
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});
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sendWoL();
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}
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