msarLab/DexRewrite

DexRewrite

A Framework for Rewriting DEX Files，Mainly for Android shell unpack,

How to build?

1. Build in android studio with cmake
2. Build in clion with cmake

Usage

There are usage examples in library.cpp

eg.1

Lookup all class

void lookup_all_class(dex_ir::Header *mHeader) {
    for (auto &class_item : mHeader->GetCollections().ClassDefs()) {
    }
}

eg.2

Look up all Dexcode，you can modify Dexcode.

/**
 * look up all dexcode item
 * @param mHeader
 */
void lookup_all_code(dex_ir::Header *mHeader) {
    for (auto &code_item : mHeader->GetCollections().CodeItems()) {

    }
}

eg.3

lookup all method

void lookup_all_method(dex_ir::Header *mHeader) {
    for (auto &method_item : mHeader->GetCollections().MethodItems()) {
        //name
        auto method_name = method_item.second->GetMethodId()->Name()->Data();
        auto method_sign = method_item.second->GetSignure();
        auto class_name = method_item.second->GetClassName();

        //dex_code
        auto code_item = method_item.second->GetCodeItem();
        if (code_item != nullptr) {

        }
        //fix 3
        // memcpy(method->GetCodeItem()->Insns(), dexcode_i1, method->GetCodeItem()->InsnsSize() * 2);
        //create new code_item
        //dex_ir::CodeItem *codeItem = mHeader->GetCollections().CreateCodeItem(*mDexFile.get(),reinterpret_cast<uint8_t *>(dexCode),index,code_items->GetMethodItem()->GetMethodId()->GetIndex());
        //code_items->GetMethodItem()->SetCodeItem(codeItem);
        // change AccessFlags to remove native falgs
        // method_item.second->SetAccessFlags()
    }
}

About

Copy from AOSP https://android.googlesource.com/platform/art/+/master/dexlayout/ https://android.googlesource.com/platform/art/+/refs/heads/master/libdexfile/