private void hookRecieveMessage(ClassNode cn) {
Pattern p =
new PatternBuilder()
.add(
new InstructionElement(DUP),
new InstructionElement(INVOKESPECIAL),
new LdcElement(new LdcInsnNode("\n")))
.build();
for (MethodNode mn : cn.methods) {
if (!p.contains(mn.instructions)) continue;
int offset = p.getOffset(mn.instructions);
MethodInsnNode getMsgInsn = (MethodInsnNode) mn.instructions.get(offset + 5);
InsnList inject = new InsnList();
inject.add(new VarInsnNode(ALOAD, 1));
inject.add(
new MethodInsnNode(
INVOKEVIRTUAL, getMsgInsn.owner, getMsgInsn.name, "()Ljava/lang/String;", false));
inject.add(
new MethodInsnNode(
INVOKESTATIC,
"me/themallard/bitmmo/impl/plugin/chathook/ChatHookManager",
"onReceiveMessage",
"(Ljava/lang/String;)V",
false));
mn.instructions.insertBefore(mn.instructions.get(offset), inject);
}
}
private void createAddMessage(ClassNode cn) {
Pattern p =
new PatternBuilder()
.add(
new InstructionElement(ALOAD),
new LdcElement(new LdcInsnNode("")),
new InstructionElement(ALOAD),
new InstructionElement(INVOKEVIRTUAL))
.build();
MethodInsnNode ebola1 = null;
for (MethodNode mn : cn.methods) {
if (!p.contains(mn.instructions)) continue;
int offset = p.getOffset(mn.instructions);
ebola1 = (MethodInsnNode) mn.instructions.get(offset + 3);
}
{
MethodVisitor mv =
cn.visitMethod(ACC_PUBLIC, "addChatMessage", "(Ljava/lang/String;)V", null, null);
mv.visitVarInsn(ALOAD, 0);
mv.visitLdcInsn("");
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, ebola1.owner, ebola1.name, ebola1.desc, ebola1.itf);
mv.visitInsn(RETURN);
mv.visitEnd();
}
}
private void hookSendMessage(ClassNode cn) {
Pattern p =
new PatternBuilder()
.add(
new InstructionElement(INVOKESTATIC),
new AnyElement(),
new LdcElement(new LdcInsnNode("Chat")),
new InstructionElement(INVOKEVIRTUAL))
.build();
for (MethodNode mn : cn.methods) {
if (!p.contains(mn.instructions)) continue;
int offset = p.getOffset(mn.instructions) + 4;
InsnList inject = new InsnList();
inject.add(new VarInsnNode(ALOAD, 2));
inject.add(
new MethodInsnNode(
INVOKESTATIC,
"me/themallard/bitmmo/impl/plugin/chathook/ChatHookManager",
"onChatMessage",
"(Ljava/lang/String;)V",
false));
mn.instructions.insert(mn.instructions.get(offset), inject);
}
}
// too lazy to deobfuscate all network/chat stuff, use info from method
// calls to create new send message function
private void createSendMessage(ClassNode cn) {
Pattern p =
new PatternBuilder()
.add(
new InstructionElement(INVOKESTATIC),
new AnyElement(),
new LdcElement(new LdcInsnNode("Chat")),
new InstructionElement(INVOKEVIRTUAL))
.build();
MethodInsnNode newBuilder = null;
MethodInsnNode setChatText = null;
MethodInsnNode ebola1 = null;
MethodInsnNode ebola2 = null;
MethodInsnNode ebola3 = null;
MethodInsnNode ebola4 = null;
MethodInsnNode ebola5 = null;
MethodInsnNode ebola6 = null;
MethodInsnNode ebola7 = null;
for (MethodNode mn : cn.methods) {
if (!p.contains(mn.instructions)) continue;
int offset = p.getOffset(mn.instructions);
newBuilder = (MethodInsnNode) mn.instructions.get(offset - 9); // newbuilder
// then var insn of parameter, ldc or w/e
setChatText = (MethodInsnNode) mn.instructions.get(offset - 7); // setchattext
ebola1 = (MethodInsnNode) mn.instructions.get(offset - 6); // U a
ebola2 = (MethodInsnNode) mn.instructions.get(offset - 5); // U p
ebola3 = (MethodInsnNode) mn.instructions.get(offset - 4); // Player
// r
ebola4 = (MethodInsnNode) mn.instructions.get(offset - 3); // setMapID
ebola5 = (MethodInsnNode) mn.instructions.get(offset - 2); // build
// store that crap
ebola6 = (MethodInsnNode) mn.instructions.get(offset); // i e
// load crap again
// LDC "Chat"
ebola7 = (MethodInsnNode) mn.instructions.get(offset + 3); // i a
}
{
MethodVisitor mv =
cn.visitMethod(ACC_PUBLIC, "sendChatMessage", "(Ljava/lang/String;)V", null, null);
mv.visitMethodInsn(
INVOKESTATIC, newBuilder.owner, newBuilder.name, newBuilder.desc, newBuilder.itf);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(
INVOKEVIRTUAL, setChatText.owner, setChatText.name, setChatText.desc, setChatText.itf);
mv.visitMethodInsn(INVOKESTATIC, ebola1.owner, ebola1.name, ebola1.desc, ebola1.itf);
mv.visitMethodInsn(INVOKEVIRTUAL, ebola2.owner, ebola2.name, ebola2.desc, ebola2.itf);
mv.visitMethodInsn(INVOKEVIRTUAL, ebola3.owner, ebola3.name, ebola3.desc, ebola3.itf);
mv.visitMethodInsn(INVOKEVIRTUAL, ebola4.owner, ebola4.name, ebola4.desc, ebola4.itf);
mv.visitMethodInsn(INVOKEVIRTUAL, ebola5.owner, ebola5.name, ebola5.desc, ebola5.itf);
mv.visitVarInsn(ASTORE, 2);
mv.visitMethodInsn(INVOKESTATIC, ebola6.owner, ebola6.name, ebola6.desc, ebola6.itf);
mv.visitVarInsn(ALOAD, 2);
mv.visitLdcInsn("Chat");
mv.visitMethodInsn(INVOKEVIRTUAL, ebola7.owner, ebola7.name, ebola7.desc, ebola7.itf);
mv.visitInsn(RETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
}
}