wip

src/idz/bigint.ts

@@ -0,0 +1,33 @@
+export function byteString(n: bigint, length: number) {
+  const result = Buffer.alloc(length);
+
+  for (let i = 0; i < length; i++) {
+    const shift = 8n * BigInt(i);
+    const byte = (n >> shift) & 0xffn;
+
+    result[i] = Number(byte);
+  }
+
+  return result;
+}
+
+// i pick the one implementation language that doesn't have this built in
+
+export function modPow(b: bigint, e: bigint, m: bigint) {
+  // https://en.wikipedia.org/wiki/Modular_exponentiation#Right-to-left_binary_method
+
+  let result = 1n;
+
+  b = b % m;
+
+  while (e > 0n) {
+    if ((e & 1n) === 1n) {
+      result = (result * b) % m;
+    }
+
+    e = e >> 1n;
+    b = (b * b) % m;
+  }
+
+  return result;
+}

src/idz/decoder.ts

@@ -0,0 +1,91 @@
+import { Transform } from "stream";
+
+import { MSG, MSG_LEN } from "./defs";
+
+const readers = new Map();
+
+function readHeader(buf) {
+  return {
+    blah: "blah",
+  };
+}
+
+readers.set(MSG.GET_CONFIG_DATA_REQ, buf => {
+  return { type: "get_config_data_req" };
+});
+
+readers.set(MSG.GET_CONFIG_DATA_2_REQ, buf => {
+  return { type: "get_config_data_2_req" };
+});
+
+readers.set(MSG.GET_SERVER_LIST_REQ, buf => {
+  return { type: "get_server_list_req" };
+});
+
+export class Decoder extends Transform {
+  state: Buffer;
+
+  constructor() {
+    super({
+      readableObjectMode: true,
+      writableObjectMode: true,
+    });
+
+    this.state = Buffer.alloc(0);
+  }
+
+  _transform(chunk, encoding, callback) {
+    this.state = Buffer.concat([this.state, chunk]);
+
+    // Read header
+
+    if (this.state.length < 0x04) {
+      return callback(null);
+    }
+
+    const magic = this.state.readUInt32LE(0);
+
+    if (magic !== 0x01020304) {
+      return callback(
+        new Error(
+          "Invalid magic number, cryptographic processing probably incorrect."
+        )
+      );
+    }
+
+    if (this.state.length < 0x30) {
+      return callback(null);
+    }
+
+    const header = readHeader(this.state);
+
+    if (this.state.length < 0x32) {
+      return callback(null);
+    }
+
+    const msgCode = this.state.readUInt16LE(0x30);
+    const msgLen = MSG_LEN.get(msgCode);
+    const reader = readers.get(msgCode);
+
+    if (msgLen === undefined || reader === undefined) {
+      return callback(
+        new Error(
+          `Unknown command code ${msgCode.toString(16)}, cannot continue`
+        )
+      );
+    }
+
+    if (this.state.length < 0x30 + msgLen) {
+      return callback(null);
+    }
+
+    const reqBuf = this.state.slice(0x30, 0x30 + msgLen);
+    const payload = reader(reqBuf);
+
+    console.log("Idz: RAW:", reqBuf.toString("hex"));
+    console.log("Idz: Header:", header);
+    console.log("Idz: Payload:", payload);
+
+    return callback(null, { header, payload });
+  }
+}

src/idz/defs.ts

@@ -0,0 +1,14 @@
+export const MSG = {
+  GET_CONFIG_DATA_REQ: 0x0004,
+  GET_CONFIG_DATA_RES: 0x0005,
+  GET_SERVER_LIST_REQ: 0x0006,
+  GET_SERVER_LIST_RES: 0x0007,
+  GET_CONFIG_DATA_2_REQ: 0x00ab,
+  GET_CONFIG_DATA_2_RES: 0x00ac,
+};
+
+export const MSG_LEN = new Map();
+
+MSG_LEN.set(MSG.GET_CONFIG_DATA_REQ, 0x0050);
+MSG_LEN.set(MSG.GET_CONFIG_DATA_2_REQ, 0x0010);
+MSG_LEN.set(MSG.GET_SERVER_LIST_REQ, 0x0020);

src/idz/encoder.ts

@@ -0,0 +1,76 @@
+import { Transform } from "stream";
+
+import { MSG } from "./defs";
+
+const writers = new Map<string, (foo: any) => Buffer>();
+
+writers.set("get_config_data_res", obj => {
+  const buf = Buffer.alloc(0x01a0);
+
+  buf.writeUInt16LE(MSG.GET_CONFIG_DATA_RES, 0x0000);
+  buf.writeUInt16LE(obj.status, 0x0002);
+
+  return buf;
+});
+
+writers.set("get_config_data_2_res", obj => {
+  const buf = Buffer.alloc(0x230);
+
+  buf.writeUInt16LE(MSG.GET_CONFIG_DATA_2_RES, 0x0000);
+  buf.writeUInt16LE(obj.status, 0x0002);
+
+  return buf;
+});
+
+writers.set("get_server_list_res", obj => {
+  const buf = Buffer.alloc(0x04b0);
+
+  buf.writeUInt16LE(MSG.GET_SERVER_LIST_RES, 0x0000);
+  buf.writeUInt16LE(obj.status, 0x0002);
+  buf.write(obj.userDb.addr, 0x0004);
+  buf.writeUInt16LE(obj.userDb.tcp, 0x0084);
+  buf.writeUInt16LE(obj.userDb.http, 0x0086);
+  buf.write(obj.matchAddr, 0x0088);
+  buf.writeUInt16LE(obj.matchPort.tcp, 0x0108);
+  buf.writeUInt16LE(obj.matchPort.udpSend, 0x010a);
+  buf.writeUInt16LE(obj.matchPort.udpRecv, 0x010c);
+  buf.writeUInt16LE(obj.tagMatchPort.tcp, 0x010e);
+  buf.writeUInt16LE(obj.tagMatchPort.udpSend, 0x0110);
+  buf.writeUInt16LE(obj.tagMatchPort.udpRecv, 0x0112);
+  buf.write(obj.event.addr, 0x0114);
+  buf.writeUInt16LE(obj.event.tcp, 0x0194);
+  buf.write(obj.screenshot.addr, 0x0198);
+  buf.writeUInt16LE(obj.screenshot.tcp, 0x0218);
+  buf.write(obj.pingReturn, 0x021c);
+  buf.write(obj.echo1.addr, 0x029c);
+  buf.write(obj.echo2.addr, 0x031c);
+  buf.writeUInt16LE(obj.echo1.udp, 0x39c);
+  buf.writeUInt16LE(obj.echo2.udp, 0x39e);
+  buf.write(obj.newsUrl, 0x03a0);
+  buf.write(obj.reportErrorUrl, 0x0424);
+
+  return buf;
+});
+
+export class Encoder extends Transform {
+  constructor() {
+    super({
+      readableObjectMode: true,
+      writableObjectMode: true,
+    });
+  }
+
+  _transform(obj, encoding, callback) {
+    console.log("Idz: Response:", obj);
+
+    const writer = writers.get(obj.type);
+
+    if (writer === undefined) {
+      return callback(new Error(`No writer for type ${obj.type}`));
+    }
+
+    const buf = writer(obj);
+
+    return callback(null, buf);
+  }
+}

src/idz/index.ts

@@ -0,0 +1,80 @@
+import { hostname } from "os";
+
+import setup from "./setup";
+
+export default async function idz(socket) {
+  const { input, output } = setup(socket);
+
+  console.log("Idz: Connection opened");
+
+  try {
+    for await (const msg of input) {
+      switch (msg.payload.type) {
+        case "get_server_list_req":
+          const myHost = hostname();
+
+          output.write({
+            type: "get_server_list_res",
+            status: 1,
+            userDb: {
+              addr: myHost,
+              tcp: 10000,
+              http: 10001,
+            },
+            matchAddr: myHost,
+            matchPort: {
+              tcp: 10002,
+              udpSend: 10003,
+              udpRecv: 10004,
+            },
+            tagMatchPort: {
+              tcp: 10005,
+              udpSend: 10006,
+              udpRecv: 10007,
+            },
+            event: {
+              addr: myHost,
+              tcp: 10008,
+            },
+            screenshot: {
+              addr: myHost,
+              tcp: 10009,
+            },
+            pingReturn: myHost,
+            echo1: {
+              addr: myHost,
+              udp: 10010,
+            },
+            echo2: {
+              addr: myHost,
+              udp: 10011,
+            },
+            newsUrl: `http://${myHost}:10012/news`,
+            reportErrorUrl: `http://${myHost}:10013/error`,
+          });
+
+          break;
+
+        case "get_config_data_req":
+          output.write({
+            type: "get_config_data_res",
+            status: 1,
+          });
+
+          break;
+
+        case "get_config_data_2_req":
+          output.write({
+            type: "get_config_data_2_res",
+            status: 1,
+          });
+
+          break;
+      }
+    }
+  } catch (e) {
+    console.log("Idz: Error", e);
+  }
+
+  console.log("Idz: Connection closed");
+}

src/idz/ping.ts

@@ -0,0 +1,11 @@
+import { createSocket } from "dgram";
+
+export default function createPing(port: number) {
+  const socket = createSocket("udp4");
+
+  socket.bind(port);
+  socket.on("message", (msg, rinfo) => {
+    console.log(`Idz Ping: Ping from ${rinfo.address}:${rinfo.port}`);
+    socket.send(msg, rinfo.port, rinfo.address);
+  });
+}

src/idz/setup.ts

@@ -0,0 +1,62 @@
+import { createCipheriv, createDecipheriv } from "crypto";
+import { Socket } from "net";
+import { pipeline } from "stream";
+
+import { byteString, modPow } from "./bigint";
+import { Decoder } from "./decoder";
+import { Encoder } from "./encoder";
+
+// Proof-of-concept, so we only ever use one of the ten RSA keys
+const key = {
+  N: 4922323266120814292574970172377860734034664704992758249880018618131907367614177800329506877981986877921220485681998287752778495334541127048495486311792061n,
+  d: 1163847742215766215216916151663017691387519688859977157498780867776436010396072628219119707788340687440419444081289736279466637153082223960965411473296473n,
+  e: 3961365081960959178294197133768419551060435043430437330799371731939550352626564261219865471710058480523874787120718634318364066605378505537556570049131337n,
+  hashN: 2662304617,
+};
+
+// Proof-of-concept, so we only use one fixed session key
+const sessionKey = 0xffddeeccbbaa99887766554433221100n;
+
+// -- TEST --
+const test1 = modPow(sessionKey, key.e, key.N);
+const test2 = modPow(test1, key.d, key.N);
+
+console.log("RSA ENC    :", byteString(test1, 0x40).toString("hex"));
+console.log("RSA ENCDEC :", byteString(test2, 0x40).toString("hex"));
+// -- TEST --
+
+export default function setup(socket: Socket) {
+  //
+  // Construct and transmit setup message
+  //
+
+  const keyEnc = modPow(sessionKey, key.e, key.N);
+  const msg = Buffer.alloc(0x48);
+
+  msg.set(byteString(keyEnc, 0x40), 0x00);
+  msg.writeUInt32LE(0x01020304, 0x40); // Meaning of this field is unknown
+  msg.writeUInt32LE(key.hashN, 0x44);
+
+  socket.write(msg);
+
+  //
+  // Set up pipeline
+  //
+
+  const keybuf = byteString(sessionKey, 0x10);
+  const input = pipeline(
+    socket,
+    createDecipheriv("aes-128-ecb", keybuf, null).setAutoPadding(false),
+    new Decoder()
+  );
+
+  const output = new Encoder();
+
+  pipeline(
+    output,
+    createCipheriv("aes-128-ecb", keybuf, null).setAutoPadding(false),
+    socket
+  );
+
+  return { input, output };
+}

src/index.ts

@@ -7,6 +7,8 @@ import aimedb from "./aimedb";
 import billing from "./billing";
 import chunithm from "./chunithm";
 import diva from "./diva";
+import idz from "./idz";
+import idzPing from "./idz/ping";
 import startup from "./startup";
 
 const tls = {
@@ -21,4 +23,10 @@ https.createServer(tls, billing).listen(8443);
 http.createServer(chunithm).listen(9000);
 http.createServer(diva).listen(9001);
 
+net.createServer(idz).listen(10000);
+idzPing(10001);
+idzPing(10003);
+idzPing(10010);
+idzPing(10011);
+
 console.log("Startup OK");

src/startup.ts

@@ -4,10 +4,15 @@ import read = require("raw-body");
 import { unzipSync } from "zlib";
 import { hostname } from "os";
 
-const services = new Map();
+const myHost = hostname();
+const uris = new Map<string, string>();
 
-services.set("SDBT", 9000); // Chunithm
+uris.set("SDBT", `http://${myHost}:9000/`); // Chunithm
-services.set("SBZV", 9001); // Project Diva Future Tone
+uris.set("SBZV", `http://${myHost}:9001/`); // Project Diva Future Tone
+
+const hosts = new Map<string, string>();
+
+hosts.set("SDDF", `${myHost}:10000`); // Initial D Zero
 
 const app = express();
 
@@ -60,9 +65,6 @@ app.use(async function(req, res, next) {
 app.post("/sys/servlet/PowerOn", function(req, resp) {
   console.log("\n--- Startup Request ---\n\n", req.body);
 
-  const portNo = services.get(req.body.game_id);
-  const uri = portNo !== undefined ? `http://${hostname()}:${portNo}/` : "";
-
   // Cut milliseconds out of ISO timestamp
 
   const now = new Date();
@@ -71,8 +73,8 @@ app.post("/sys/servlet/PowerOn", function(req, resp) {
 
   const resParams = {
     stat: 1,
-    uri,
+    uri: uris.get(req.body.game_id) || "",
-    host: "",
+    host: hosts.get(req.body.game_id) || "",
     place_id: "123",
     name: "Name",
     nickname: "Nick",

tsconfig.json

@@ -5,7 +5,7 @@
     "moduleResolution": "node",
     "outDir": "./bin/",
     "strictNullChecks": true,
-    "target": "es2017"
+    "target": "esnext"
   },
   "include": ["./src/"],
   "exclude": ["./src/**/*.test.ts"]