SONce

ofc u can. and its working for my 1.7.10 server. https://github.com/oshi/oshi

not shure u can change serial of your cpu with 1 click. Ok. Moderator can close topic now.

HardwareID. default ban system can be bypased with 1 click. But lets return to forum topic. Is there way to send additional info in login packet?

Hi, i need to add additional field in login packet from client. Reason is: i need to check hwid of clients for ban(i have implemented and working hwid class). I have working mod on 1.7.10, its uses ASM to modify login packet on clientside and bukkit to read it on clien. package my_class.hwidmod.coremod; import net.minecraft.launchwrapper.IClassTransformer; import org.objectweb.asm.ClassReader; import org.objectweb.asm.ClassWriter; import org.objectweb.asm.MethodVisitor; import org.objectweb.asm.tree.*; import java.util.ArrayList; import java.util.List; import java.util.ListIterator; import static org.objectweb.asm.Opcodes.*; @SuppressWarnings("unused") public final class ASMTransformer implements IClassTransformer { private static final String HWID_UTILS_CLASS_NAME = "my_class_here/HwidUtils"; private static final String HWID_UTILS_METHOD_GET_HWID_NAME = "getHwid"; private static final String HWID_UTILS_METHOD_GET_HWID_DESC = "()[B"; private static final String FIELD_HWID_NAME = "hwid"; private static final String FIELD_HWID_DESC = "[B"; private static final String METHOD_GET_HWID_NAME = "getHwid"; private static final String METHOD_GET_HWID_DESC = "()[B"; @Override public byte[] transform(String name, String transformedName, byte[] basicClass) { if (transformedName.equals("net.minecraft.network.login.client.C00PacketLoginStart")) return transformLoginPacket(basicClass); return basicClass; } private static byte[] transformLoginPacket(byte[] basicClass) { ClassNode classNode = new ClassNode(); new ClassReader(basicClass).accept(classNode, 0); // May be need add it before static field __OBFID? classNode.visitField(ACC_PRIVATE, FIELD_HWID_NAME, FIELD_HWID_DESC, null, null).visitEnd(); MethodVisitor getterVisitor = classNode.visitMethod(ACC_PUBLIC, METHOD_GET_HWID_NAME, METHOD_GET_HWID_DESC, null, null); getterVisitor.visitVarInsn(ALOAD, 0); getterVisitor.visitFieldInsn(GETFIELD, classNode.name, FIELD_HWID_NAME, FIELD_HWID_DESC); getterVisitor.visitInsn(ARETURN); getterVisitor.visitEnd(); MethodNode methodNode = findMethod(classNode, "<init>", "()V"); for (AbstractInsnNode returnInsnNode : findAllInsnNodes(methodNode, RETURN)) { InsnList insnList = new InsnList(); insnList.add(new VarInsnNode(ALOAD, 0)); insnList.add(new FieldInsnNode(GETSTATIC, "org/apache/commons/lang3/ArrayUtils", "EMPTY_BYTE_ARRAY", "[B")); insnList.add(new FieldInsnNode(PUTFIELD, classNode.name, FIELD_HWID_NAME, FIELD_HWID_DESC)); methodNode.instructions.insertBefore(returnInsnNode, insnList); } methodNode = findMethod(classNode, "<init>", "(Lcom/mojang/authlib/GameProfile;)V"); for (AbstractInsnNode returnInsnNode : findAllInsnNodes(methodNode, RETURN)) { InsnList insnList = new InsnList(); insnList.add(new VarInsnNode(ALOAD, 0)); insnList.add(new MethodInsnNode(INVOKESTATIC, HWID_UTILS_CLASS_NAME, HWID_UTILS_METHOD_GET_HWID_NAME, HWID_UTILS_METHOD_GET_HWID_DESC, false)); insnList.add(new FieldInsnNode(PUTFIELD, classNode.name, FIELD_HWID_NAME, FIELD_HWID_DESC)); methodNode.instructions.insertBefore(returnInsnNode, insnList); } methodNode = findMethod(classNode, CoreMod.isObfuscated() ? "func_148837_a" : "readPacketData", "(Lnet/minecraft/network/PacketBuffer;)V"); for (AbstractInsnNode returnInsnNode : findAllInsnNodes(methodNode, RETURN)) { InsnList insnList = new InsnList(); insnList.add(new VarInsnNode(ALOAD, 0)); insnList.add(new VarInsnNode(ALOAD, 1)); insnList.add(new MethodInsnNode(INVOKESTATIC, "net/minecraft/network/Packet", CoreMod.isObfuscated() ? "func_148834_a" : "readBlob", "(Lio/netty/buffer/ByteBuf;)[B", false)); insnList.add(new FieldInsnNode(PUTFIELD, classNode.name, FIELD_HWID_NAME, FIELD_HWID_DESC)); methodNode.instructions.insertBefore(returnInsnNode, insnList); } methodNode = findMethod(classNode, CoreMod.isObfuscated() ? "func_148840_b" : "writePacketData", "(Lnet/minecraft/network/PacketBuffer;)V"); for (AbstractInsnNode returnInsnNode : findAllInsnNodes(methodNode, RETURN)) { InsnList insnList = new InsnList(); insnList.add(new VarInsnNode(ALOAD, 1)); insnList.add(new VarInsnNode(ALOAD, 0)); insnList.add(new FieldInsnNode(GETFIELD, classNode.name, FIELD_HWID_NAME, FIELD_HWID_DESC)); insnList.add(new MethodInsnNode(INVOKESTATIC, "net/minecraft/network/Packet", CoreMod.isObfuscated() ? "func_148838_a" : "writeBlob", "(Lio/netty/buffer/ByteBuf;[B)V", false)); methodNode.instructions.insertBefore(returnInsnNode, insnList); } ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_MAXS); classNode.accept(classWriter); return classWriter.toByteArray(); } private static MethodNode findMethod(ClassNode classNode, String name, String desc) { for (MethodNode methodNode : classNode.methods) { if (methodNode.name.equals(name) && methodNode.desc.equals(desc)) return methodNode; } throw new NullPointerException("Method " + classNode.name + '.' + name + desc + " not found"); } private static List<AbstractInsnNode> findAllInsnNodes(MethodNode methodNode, int opcode) { return findAllInsnNodes(methodNode.instructions, opcode); } private static List<AbstractInsnNode> findAllInsnNodes(InsnList insnList, int opcode) { List<AbstractInsnNode> list = new ArrayList<AbstractInsnNode>(1); for (ListIterator<AbstractInsnNode> iterator = insnList.iterator(); iterator.hasNext(); ) { AbstractInsnNode insnNode = iterator.next(); if (insnNode.getOpcode() == opcode) list.add(insnNode); } return list; } } But, as far as i know asm is bad practice and dont have suport now. And theris zero documentation on this. So how can i achive custom field in login packet in 1.12.2? Iam thinking about modifying userPropertis but don know how to do it with forge.