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26
.github/workflows/ci.yml
vendored
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26
.github/workflows/ci.yml
vendored
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@ -0,0 +1,26 @@
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name: Maven CI
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on:
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push:
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branches:
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- master
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pull_request:
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branches:
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- master
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jobs:
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build:
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@main
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- name: Set up JDK 21
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uses: actions/setup-java@main
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with:
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java-version: '21' # Change this to the required JDK version
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distribution: 'oracle' # Use Eclipse Temurin distribution
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cache: maven
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- name: Build with Maven
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run: mvn clean install
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13
README.md
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13
README.md
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@ -0,0 +1,13 @@
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# ServerList: A Central Server & Utilities for an abandoned MW3 Client
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This project implements a 'central' server for the now-defunct MW3 modded client known as Tekno.
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The project was initially created in 2021 as a way to explore socket management in Java, a topic I studied at university. Two years ago, I refactored the code to simplify it, and more recently, I added new features such as logging and health monitoring for the central server.
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Interestingly, the original 'master' server for Tekno was written in just 20 lines of Python code. This highlights the complexity of working with Java. However, this project aims to go beyond the basics by introducing additional features, such as a self-cleaning thread to automatically remove servers from the list if they contained "crasher" strings. While this feature was part of the 2021 version, it is not included in this newer version due to time constraints. Additionally, this version lacks unit testing.
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## Features
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- **Central Server**: Manages and lists servers for the Tekno MW3 client.
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- **Server Pinger**: Fetches and dumps information from various servers currently listed on the central server.
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- **Central Server Pinger**: Retrieves and displays basic information about the central server.
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2
pom.xml
2
pom.xml
@ -9,7 +9,7 @@
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<dependency>
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<groupId>commons-cli</groupId>
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<artifactId>commons-cli</artifactId>
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<version>1.5.0</version>
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<version>1.9.0</version>
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</dependency>
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<dependency>
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<groupId>com.googlecode.json-simple</groupId>
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@ -62,18 +62,8 @@ public class InfoDumper {
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obj.put("magic", magicBE);
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obj.put("players", playersBE);
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obj.put("sv_maxClients", maxPlayersBE);
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obj.put("info", infoString);
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saveJSONFile(String.format("stats_%d.json", Math.abs(server.hashCode())), obj);
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}
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public static void saveJSONFile(String fileName, JSONObject obj) {
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try {
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var writer = new BufferedWriter(new FileWriter(fileName));
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writer.write(obj.toJSONString());
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writer.close();
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}
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catch (IOException ex) {
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System.err.println("saveJSONFile: IOException while writing a JSON file");
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}
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Utils.saveJSONFile(String.format("stats_%d.json", Math.abs(server.hashCode())), obj);
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}
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}
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@ -23,6 +23,9 @@ import java.net.Socket;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import org.json.simple.JSONArray;
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import org.json.simple.JSONObject;
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/**
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*
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* @author Diamante
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@ -72,7 +75,7 @@ public class MasterServerPinger {
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int count = input.read(bytes);
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out.write(bytes, 0, count);
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System.out.println("readReplyFromMaster: finished reading bytes from socket");
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}
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catch (IOException ex) {
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@ -102,6 +105,40 @@ public class MasterServerPinger {
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System.out.println(String.format("readReplyFromMaster: got %d servers", serverCountBE));
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var root = new JSONObject();
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var serverArray = new JSONArray();
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// Process server data
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for (int i = 4; i < bytes.length; i += 6) {
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if (i + 6 > bytes.length) {
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System.err.println("readReplyFromMaster: Incomplete server data detected");
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break;
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}
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byte[] ipBytesLE = new byte[4];
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System.arraycopy(bytes, i, ipBytesLE, 0, 4);
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var ipBytesBE = Utils.bytesToInt(ipBytesLE);
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var ipAddress = Utils.bytesToIP(ipBytesBE);
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var portBytesLE = new byte[2];
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System.arraycopy(bytes, i + 4, portBytesLE, 0, 2);
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var port = Utils.shortSwap(portBytesLE);
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System.out.println(String.format("Server: %s:%d", ipAddress, port));
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var serverObject = new JSONObject();
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serverObject.put("IP", ipAddress);
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serverObject.put("port", port);
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serverArray.add(serverObject);
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}
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root.put("totalServers", serverCountBE);
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root.put("servers", serverArray);
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Utils.saveJSONFile(String.format("server_dump_%d.json", System.currentTimeMillis() / 1000L), root);
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try {
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out.close();
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}
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@ -105,6 +105,7 @@ public class Server {
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hash = 71 * hash + Objects.hashCode(this.address);
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hash = 71 * hash + Objects.hashCode(this.netPort);
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hash = 71 * hash + Objects.hashCode(this.version);
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hash = 71 * hash + Objects.hashCode(this.time);
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return hash;
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}
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@ -16,15 +16,19 @@
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*/
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package com.diamante.serverlist;
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import java.net.InetAddress;
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import java.io.BufferedWriter;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.nio.BufferOverflowException;
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import java.nio.ReadOnlyBufferException;
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import java.nio.ByteBuffer;
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import org.json.simple.JSONObject;
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/**
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*
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* @author Diamante
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@ -43,7 +47,7 @@ public class Utils {
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public static final int OLD_CLIENT_MAGIC = 1414022477; // THEM
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public static final int NEW_CLIENT_MAGIC = 1129268293;
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public static final int CLIENT_VERSION = 17039893;
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public static boolean isServerMagic(int magic) {
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@ -54,6 +58,18 @@ public class Utils {
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return magic == OLD_CLIENT_MAGIC;
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}
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public static int bytesToInt(byte[] bytes) {
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if (bytes.length != 4) {
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throw new IllegalArgumentException("Array must contain exactly 4 bytes.");
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}
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// Combine the bytes into an int (assuming the bytes are in Big-Endian order)
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int result = ((bytes[0] & 0xFF) << 24) | ((bytes[1] & 0xFF) << 16)
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| ((bytes[2] & 0xFF) << 8) | (bytes[3] & 0xFF);
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return result;
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}
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/**
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* Flips the array around
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*
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@ -151,4 +167,27 @@ public class Utils {
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return null;
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}
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}
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public static String bytesToIP(int in) {
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String ipAddress = String.format(
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"%d.%d.%d.%d",
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(in & 0xff),
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(in >> 8 & 0xff),
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(in >> 16 & 0xff),
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(in >> 24 & 0xff)
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);
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return ipAddress;
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}
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public static void saveJSONFile(String fileName, JSONObject obj) {
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try {
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var writer = new BufferedWriter(new FileWriter(fileName));
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writer.write(obj.toJSONString());
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writer.close();
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}
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catch (IOException ex) {
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System.err.println("saveJSONFile: IOException while writing a JSON file");
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}
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}
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}
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