100 lines
2.3 KiB
JavaScript
100 lines
2.3 KiB
JavaScript
const varint = require('varint'),
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async = require('async');
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function varIntBuffer(num) {
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return Buffer.alloc(varint.encode(num));
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}
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function buildPacket(id,data) {
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if(!data) data = Buffer.from([]);
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const idBuffer = varIntBuffer(id);
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return Buffer.concat([
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varIntBuffer(data.length+idBuffer.length),
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idBuffer,
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data
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]);
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}
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class MinecraftPing extends require('./core') {
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run(state) {
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let receivedData;
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async.series([
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(c) => {
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// build and send handshake and status TCP packet
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const portBuf = Buffer.alloc(2);
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portBuf.writeUInt16BE(this.options.port_query,0);
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const addressBuf = Buffer.from(this.options.address,'utf8');
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const bufs = [
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varIntBuffer(4),
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varIntBuffer(addressBuf.length),
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addressBuf,
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portBuf,
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varIntBuffer(1)
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];
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const outBuffer = Buffer.concat([
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buildPacket(0,Buffer.concat(bufs)),
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buildPacket(0)
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]);
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this.tcpSend(outBuffer, (data) => {
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if(data.length < 10) return false;
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const expected = varint.decode(data);
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data = data.slice(varint.decode.bytes);
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if(data.length < expected) return false;
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receivedData = data;
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c();
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return true;
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});
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},
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(c) => {
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// parse response
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let data = receivedData;
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const packetId = varint.decode(data);
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if(this.debug) console.log("Packet ID: "+packetId);
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data = data.slice(varint.decode.bytes);
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const strLen = varint.decode(data);
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if(this.debug) console.log("String Length: "+strLen);
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data = data.slice(varint.decode.bytes);
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const str = data.toString('utf8');
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if(this.debug) {
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console.log(str);
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}
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let json;
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try {
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json = JSON.parse(str);
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delete json.favicon;
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} catch(e) {
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return this.fatal('Invalid JSON');
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}
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state.raw.version = json.version.name;
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state.maxplayers = json.players.max;
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state.raw.description = json.description.text;
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if(json.players.sample) {
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for(const player of json.players.sample) {
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state.players.push({
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id: player.id,
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name: player.name
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});
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}
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}
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while(state.players.length < json.players.online) {
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state.players.push({});
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}
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this.finish(state);
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}
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]);
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}
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}
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module.exports = MinecraftPing;
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