![]() Before we start, let me explain just what we're going to be doing exactly. Even though we won't be using them quite yet, it's best to just get it over with.Īlright. Make sure you don't forget about importing the ASM jars to your project. Bytecode injection is a little faster too.Īre you ready? If so, start by creating a new project in your IDE of choice. With reflection, you're limited to manipulating the attributes of class files, interfaces, and so on. But once we start getting into things like overlaying the canvas and stuff, bytecode injection can make our job a whole lot easier. For loading the applet into our own JFrame, reflection is sufficient. The only difference is that bytecode injection obviously involves changing the class files, while reflection simply copies them so we can retrieve the data we want. You might be asking yourself: what is Reflection? Well, we can use bytecode injection and reflection to accomplish the same thing. If you want to try on the real thing, proceed at your own risk! However, the same concepts still apply for the real thing. Because I'm a bit paranoid, I'll be using a Runescape Private Server client to demonstrate bytecode injection instead of the real deal. ![]() We absolutely need to do this before we can start changing the bytecode, since we obviously need class files to change in the first place.īefore we can get started with making our loader, we first need to actually download the client. Sorry for lying! To make it even worse, I won't be explaining the actual bytecode injection part until we're done loading the client. The truth is, we're going to be using the Reflection library to actually load the client inside our own JFrame. I said this would be an injection bot, but in truth, it's a hybrid bot. You can start out by downloading the required jar files.Ĭreating our own Runescape loader I lied. However, before we can get started actually using the ASM library, we need to download the jar file(s) and add them to our project. I'll be explaining how everything works nevertheless. However, if you're already familiar with JVM bytecode and the Visitor design pattern, this will probably be much easier for you. Because it is based on the Visitor design pattern and it's quite low-level, it might have a steep learning curve for you. For this tutorial, we'll be using the ASM library. We accomplish this by either using the Instrumentation API or depending on third-party libraries like ASM, JavaAssist or any other library. Bytecode manipulation must then be the manipulation of the bytecode in a class file. This is what happens when you turn a Java file into a class file. Java code must at some point be compiled into bytecode, and only then can it be ran on the JVM. Bytecode for the JVM is like assembly for the processor. I won't be able to answer questions on Discord unless they are very minor.īytecode Manipulation, what is it? The Java Virtual Machine, the platform on which Java programs are ran, does not understand Java code. IMPORTANT: If you have any questions or if you need help, make a new thread describing your specific problem. If you don't know Java, you might as well stop reading now unless you like reading gibberish that doesn't make any sense. I will assume that you already know Java, or at least the basics. ![]() This tutorial will follow a bottom-up teaching approach, meaning that I'll start talking about the core basics of what you need to know to write your own bot, and then things will get increasingly more advanced until we've got a working prototype of our very own bot. This tutorial will be very detailed, so if you're looking for a quick explanation, you're probably in the wrong place. ![]() ![]() This is my attempt to explain everything in detail, from how bytecode works, how to manipulate bytecode with the ASM library, to how the classloaders can be used to make the injection work, and why it works. The other tutorials that I've seen on other forums are pretty bad in my opinion, mainly because they don't explain how crucial aspects of the bot architecture works, leaving it up to the reader to figure out exactly how and why something works in the first place. Hello, and welcome to my tutorial on how to write an Injection Bot for Runescape. ![]()
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