facebook/fishhook
Fishhook
Fishhook is a binary instrumentation library for iOS and iOS simulators. It functions as a Mach-O symbol rebinder and instrumenter, allowing for the replacement of system library implementations with custom logic at runtime.
The project redirects function calls by updating lazy and non-lazy symbol pointers within Mach-O binary data segments. This approach enables the interception and modification of existing function behavior without altering the original binary on disk.
The toolset covers binary instrumentation and dynamic hooking for iOS applications, facilitating the monitoring and alteration of function calls through runtime address redirection and symbol rebinding.
Features
- Dynamic Hooking - Provides the capability to intercept and modify function behavior in iOS applications at runtime.
- Binary Instrumentation - Acts as a low-level utility for manipulating binary data segments to intercept dynamic symbol lookups.
- Mach-O Symbol Rebinding - Updates the lazy symbol pointer table in Mach-O binaries to intercept function calls at runtime.
- Dynamic Hooking Libraries - Provides a specialized library for replacing system library implementations with custom logic on iOS.
- Application Instrumentation - Enables the injection of custom code into running iOS processes for debugging and analysis.
- Linker Redirection - Implements function redirection by mimicking the system linker to swap original symbol addresses.
- Runtime Memory Redirection - Changes function call destinations by manipulating binary jump tables during program execution.
- iOS and macOS Utilities - Dynamic symbol rebinding library for Mach-O binaries.
- Security & Privacy - Tool for hooking system methods.
