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# forceredfine
ForceRedefine is a JVMTI agent designed for testing how redefiniton affects running processes. It
allows one to force classes to be redefined by writing to a fifo or give a process a list of
classes to try redefining. Currently the redefinition is limited to adding (or removing) a single
NOP at the beginning of every function in the class.
# Usage
### Build
> `m libforceredefine`
The libraries will be built for 32-bit, 64-bit, host and target. Below examples
assume you want to use the 64-bit version.
#### ART
> `adb shell setenforce 0`
>
> `adb push $ANDROID_PRODUCT_OUT/system/lib64/libforceredefine.so /data/local/tmp/`
>
> `echo java/util/ArrayList > /tmp/classlist`
> `echo java/util/Arrays >> /tmp/classlist`
> `adb push /tmp/classlist /data/local/tmp/`
>
> `adb shell am attach-agent $(adb shell pidof some.deubggable.app) /data/local/tmp/libforceredefine.so=/data/local/tmp/classlist`
Since the agent has no static state it can be attached multiple times to the same process.
> `adb shell am attach-agent $(adb shell pidof some.deubggable.app) /data/local/tmp/libforceredefine.so=/data/local/tmp/classlist`
> `adb shell am attach-agent $(adb shell pidof some.deubggable.app) /data/local/tmp/libforceredefine.so=/data/local/tmp/classlist2`
> `adb shell am attach-agent $(adb shell pidof some.deubggable.app) /data/local/tmp/libforceredefine.so=/data/local/tmp/classlist`
One can also use fifos to send classes interactively to the process. (TODO: Have the agent
continue reading from the fifo even after it gets an EOF.)
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