sourcequery nodejs

sourcequery.js

const dgram = require("dgram");

const ip = process.argv[2];
const port = process.argv[3] || 27015;

if (!ip) {
  console.log("giv ip");
  process.exit(1);
}

function dumpPacket(view) {
  let bytes = "";
  let str = "";
  let allBytes = "";
  for (let i = 0; i < view.byteLength; i++) {
    if ((i > 0 && i % 16 == 0) || i == view.byteLength - 1) {
      console.log(bytes.padEnd(48, " ") + "   " + str);
      allBytes += bytes;
      bytes = "";
      str = "";
    }

    const byte = view.getUint8(i);
    bytes += byte.toString(16).padStart(2, "0").toUpperCase() + " ";
    str += byte < 0x10 || byte == 0x7f ? "." : String.fromCharCode(byte);
  }

  console.log(allBytes);
}

const request_info = [
  0xff, 0xff, 0xff, 0xff, 0x54, 0x53, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x20, 0x45, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x20,
  0x51, 0x75, 0x65, 0x72, 0x79, 0x00,
];

const request_rules = [0xff, 0xff, 0xff, 0xff, 0x56];

const rulePackets = [];
let chunks = -1;

function processRules() {
  const data = rulePackets.flat();
  const dataArray = new Uint8Array(data);

  const rulesMsg = new DataView(dataArray.buffer);

  //dumpPacket(rulesMsg);

  if (rulesMsg.getUint8(4) == 0x45) {
    let idx = 5;

    const rule_count = rulesMsg.getUint16(idx, true);
    idx += 2;
    console.log("cvar count:", rule_count);

    const rules = [];
    for (i = 0; i < rule_count; i++) {
      if (idx >= rulesMsg.byteLength) break;

      const _name = [];
      while (rulesMsg.getUint8(idx) != 0) {
        _name.push(rulesMsg.getUint8(idx));
        idx++;
      }
      idx++;
      const name = String.fromCharCode(..._name);

      if (idx >= rulesMsg.byteLength) break;
      const _value = [];
      while (rulesMsg.getUint8(idx) != 0) {
        _value.push(rulesMsg.getUint8(idx));
        idx++;
      }
      idx++;
      const value = String.fromCharCode(..._value);

      rules.push({name, value});
    }

    console.log("====== CVars ======");
    for (const rule of rules) {
      console.log(`${rule.name} = ${rule.value}`);
    }
  } else {
    console.log("malformed rules packet o7");
  }
}

function handlerRules(message, resolve, reject, wrapper, client) {
  const msg = new DataView(message.buffer);
  //console.log("rules", message);

  if (msg.getUint8(4) == 0x41) {
    const challenge = [msg.getUint8(5), msg.getUint8(6), msg.getUint8(7), msg.getUint8(8)];

    //console.log("got challenge", challenge);
    client.send(Buffer.from([...request_rules, ...challenge]), port, ip, function (err) {
      if (err) {
        client.close();
        reject(err);
      }
    });
  } else if (msg.getUint8(0) == 0xfe && msg.getUint8(1) == 0xff && msg.getUint8(2) == 0xff && msg.getUint8(3) == 0xff) {
    chunks = msg.getUint8(8);
    const chunkIdx = msg.getUint8(9);
    const chunk = [];
    for (let i = 12; i < msg.byteLength; i++) {
      chunk.push(msg.getUint8(i));
    }
    rulePackets[chunkIdx] = chunk;
  }

  if (chunks != -1 && rulePackets.length == chunks) {
    client.close();
    processRules();

    client.off("message", wrapper);
    resolve(true);
  }
}

function a2sRules() {
  //console.log("requesting rules");
  return new Promise((resolve, reject) => {
    const client = dgram.createSocket("udp4");
    client.send(Buffer.from([...request_rules, 0xff, 0xff, 0xff, 0xff]), port, ip, function (err) {
      if (err) {
        client.close();
        reject(err);
      }
    });

    function wrapper(message) {
      handlerRules(message, resolve, reject, wrapper, client);
    }

    client.on("message", wrapper);
  });
}

function handlerInfo(message, resolve, reject, wrapper, client) {
  const msg = new DataView(message.buffer);
  //console.log("info", message);

  if (msg.getUint8(4) == 0x41) {
    const challenge = [msg.getUint8(5), msg.getUint8(6), msg.getUint8(7), msg.getUint8(8)];

    //console.log("got challenge", challenge);
    client.send(Buffer.from([...request_info, ...challenge]), port, ip, function (err) {
      if (err) {
        client.close();
        reject(err);
      }
    });
  } else if (msg.getUint8(4) == 0x49) {
    //console.log("got query response");

    //dumpPacket(msg);

    const protocolVer = msg.getUint8(5);
    console.log("protocol version:", protocolVer);

    let idx = 6;

    const name = [];

    while (msg.getUint8(idx) != 0) {
      name.push(msg.getUint8(idx));
      idx++;
    }

    console.log("name:", String.fromCharCode(...name));
    idx++;

    const map = [];
    while (msg.getUint8(idx) != 0) {
      map.push(msg.getUint8(idx));
      idx++;
    }

    console.log("map:", String.fromCharCode(...map));
    idx++;

    const folder = [];
    while (msg.getUint8(idx) != 0) {
      folder.push(msg.getUint8(idx));
      idx++;
    }

    console.log("folder:", String.fromCharCode(...folder));
    idx++;

    const game = [];
    while (msg.getUint8(idx) != 0) {
      game.push(msg.getUint8(idx));
      idx++;
    }

    console.log("game:", String.fromCharCode(...game));
    idx++;

    console.log("steam id:", msg.getUint16(idx, true));
    idx += 2;

    console.log("players:", msg.getUint8(idx));
    idx++;

    console.log("max players:", msg.getUint8(idx));
    idx++;

    console.log("bots:", msg.getUint8(idx));
    idx++;

    console.log("type:", String.fromCharCode(msg.getUint8(idx)));
    idx++;

    console.log("os:", String.fromCharCode(msg.getUint8(idx)));
    idx++;

    console.log("visibility:", msg.getUint8(idx));
    idx++;

    console.log("vac:", msg.getUint8(idx));
    idx++;

    const version = [];
    while (msg.getUint8(idx) != 0) {
      version.push(msg.getUint8(idx));
      idx++;
    }

    console.log("version:", String.fromCharCode(...version));
    idx++;

    const edf = msg.getUint8(idx);
    idx++;

    console.log("edf is:", edf);
    console.log("\n====== EDF Values ======");

    if (edf & 0x80) {
      console.log("port:", msg.getUint16(idx, true));
      idx += 2;
    }

    if (edf & 0x10) {
      console.log("steamid:", msg.getUint32(idx, true));
      idx += 4;
    }

    if (edf & 0x40) {
      console.log("sourcetv port:", msg.getUint16(idx, true));
      idx += 2;

      idx += 4; // ???
      const stvname = [];
      while (msg.getUint8(idx) != 0) {
        stvname.push(msg.getUint8(idx));
        idx++;
      }

      console.log("sourcetv name:", String.fromCharCode(...stvname));
      idx++;
    }

    if (edf & 0x20) {
      const tags = [];
      while (msg.getUint8(idx) != 0) {
        tags.push(msg.getUint8(idx));
        idx++;
      }

      console.log("tags:", String.fromCharCode(...tags));
      idx++;
    }

    if (edf & 0x01) {
      console.log("extended app id:", msg.getBigUint64(idx, true));
      idx += 8;
    }

    client.close();
    client.off("message", wrapper);
    resolve(true);
  }
}

function a2sInfo() {
  //console.log("requesting info");
  return new Promise((resolve, reject) => {
    const client = dgram.createSocket("udp4");
    client.send(Buffer.from(request_info), port, ip, function (err) {
      if (err) {
        client.close();
        reject(err);
      }
    });

    function wrapper(message) {
      handlerInfo(message, resolve, reject, wrapper, client);
    }

    client.on("message", wrapper);
  });
}

(async () => {
  await a2sInfo();
  console.log("");
  await a2sRules();
})();