Magisk/native/src/zygisk/native_bridge.cpp

#include <android/dlext.h>
#include <dlfcn.h>
#include <unwind.h>

#include <magisk.hpp>
#include "../core/core.hpp"

// The reference layout of this struct
// https://cs.android.com/android/platform/superproject/main/+/main:art/libnativebridge/include/nativebridge/native_bridge.h
struct NativeBridgeCallbacks {
    uint32_t version;
    void *padding[5];
    bool (*isCompatibleWith)(uint32_t);
};

static bool is_compatible_with(uint32_t) {
    auto name = get_prop(NBPROP);
    android_dlextinfo info = {
        .flags = ANDROID_DLEXT_FORCE_LOAD
    };
    void *handle = android_dlopen_ext(name.data(), RTLD_LAZY, &info);
    if (handle) {
        auto entry = reinterpret_cast<void (*)(void *)>(dlsym(handle, "zygisk_inject_entry"));
        if (entry) {
            entry(handle);
        }
    }
    return false;
}

extern "C" [[maybe_unused]] NativeBridgeCallbacks NativeBridgeItf{
    .version = 2,
    .padding = {},
    .isCompatibleWith = &is_compatible_with,
};