HookCase is a tool for debugging and reverse engineering applications
on macOS (aka OS X), and the operating system itself. It re-implements
and extends
Apple's DYLD_INSERT_LIBRARIES functionality.
It can be used to hook any method in any module (even non-exported
ones, and even those that don't have an entry in their own module's
symbol table). In a single operation, it can be applied to a parent
process and all its child processes, whether or not the child
processes inherit their parent's environment. It supports
watchpoints. So HookCase is considerably more powerful than
DYLD_INSERT_LIBRARIES. It also doesn't have the restrictions Apple
has placed on DYLD_INSERT_LIBRARIES. So, for example, HookCase can
be used with applications that have
entitlements.
HookCase runs on OS X 10.9 (Mavericks) through macOS 10.15 (Catalina).
Steven Michaud, 7/2020