geode/loader/dobby/docs/get-started-android.md

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2022-07-30 12:24:03 -04:00
# Getting Started
## create native project and update CMakeLists.txt
```
if(NOT TARGET dobby)
set(DOBBY_DIR /Users/jmpews/Workspace/Project.wrk/Dobby)
macro(SET_OPTION option value)
set(${option} ${value} CACHE INTERNAL "" FORCE)
endmacro()
SET_OPTION(DOBBY_DEBUG OFF)
SET_OPTION(DOBBY_GENERATE_SHARED OFF)
add_subdirectory(${DOBBY_DIR} dobby)
get_property(DOBBY_INCLUDE_DIRECTORIES
TARGET dobby
PROPERTY INCLUDE_DIRECTORIES)
include_directories(
.
${DOBBY_INCLUDE_DIRECTORIES}
$<TARGET_PROPERTY:dobby,INCLUDE_DIRECTORIES>
)
endif()
add_library(native-lib SHARED
${DOBBY_DIR}/example/android_common_api.cc
native-lib.cpp)
```
## replace hook function
ref source `builtin-plugin/ApplicationEventMonitor/dynamic_loader_monitor.cc`
ref source `builtin-plugin/ApplicationEventMonitor/posix_file_descriptor_operation_monitor.cc`
## instrument function
ref source `builtin-plugin/ApplicationEventMonitor/memory_operation_instrument.cc`
## Android Linker Restriction
ref source `builtin-plugin/AndroidRestriction/android_restriction_demo.cc`
```c
# impl at SymbolResolver/elf/dobby_symbol_resolver.cc
void *__loader_dlopen = DobbySymbolResolver(NULL, "__loader_dlopen");
DobbyHook((void *)__loader_dlopen, (void *)fake_loader_dlopen, (void **)&orig_loader_dlopen);
```
```
# impl at AndroidRestriction/android_restriction.cc
linker_disable_namespace_restriction();
void *handle = NULL;
handle = dlopen(lib, RTLD_LAZY);
vm = dlsym(handle, "_ZN7android14AndroidRuntime7mJavaVME");
```