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

Getting Started

add DobbyX.framework to your project

cmake .. -G Xcode -DCMAKE_SYSTEM_NAME=iOS -DCMAKE_OSX_ARCHITECTURES=arm64 -DCMAKE_SYSTEM_PROCESSOR=arm64 -DCMAKE_OSX_DEPLOYMENT_TARGET=9.3

drag the DobbyX.xcodeproj to your project

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/MGCopyAnswerMonitor.cc

replace pac function

void *posix_spawn_ptr = __builtin_ptrauth_strip((void *)posix_spawn, ptrauth_key_asia);
void *fake_posix_spawn_ptr = __builtin_ptrauth_strip((void *)fake_posix_spawn, ptrauth_key_asia);

DobbyHook((void *)posix_spawn_ptr, (void *)fake_posix_spawn_ptr, (void **)&orig_posix_spawn);

*(void **)&orig_posix_spawn = (void *)ptrauth_sign_unauthenticated((void *)orig_posix_spawn, ptrauth_key_asia, 0);

objective-c toolkit

invoke DobbyOCReturnConstant("XXClass", "isVip", true); will hook the objective-c instance/class method, and return the constant 1 automatically.