Byteman extension Helper Class for Java Reverse Foundation

The previous article mentions that we can invoke the extension helper class that we write in the rules file

See an example

Create a new target project and extend the helper class project with the following structure

The code where the target project uses the second example of the previous blog

Extension helper projects need to use a third-party jar, C:\byteman-download-4.0.2\lib find Byteman.jar copy over

The Tracehelper.java code is as follows

Package Com.vvvtimes;import Org.jboss.byteman.rule.rule;import Org.jboss.byteman.rule.helper.helper;public class Tracehelper extends Helper {protected tracehelper (rule rule) {super (rule);} public boolean myprint (String message) {return Super.traceln ("!!! IMPORTANT EVENT!!! "+ message);}}

Export this project as Bytemanhelperdemo.jar

The TRACING.BTM content of the rule file in the target project is as follows, where the helper item specifies a custom helper class name

RULE Trace return Value1class com.vvvtimes.MainMETHOD Add (int,int) HELPER Com.vvvtimes.TraceHelperAT exitif Truedo Myprint ("Return value:" +$!) Endrule

Compile

Javac Com/vvvtimes/main.java

Run

Java Com.vvvtimes.Main

Add helper class rules file check, notice more a-CP Bytemanhelperdemo.jar

BMCHECK-CP. -CP bytemanhelperdemo.jar-v SCRIPTS/TRACING.BTM

Byteman Run

Java-cp ".; bytemanhelperdemo.jar;%classpath% "-javaagent:%byteman_home%\lib\byteman.jar=script:scripts/tracing.btm Com.vvvtimes.Main

The operation results are as follows

If we package the above target item into a jar, the command can be changed to the following form

The target project is packaged into a jar named Bytemandemo2.jar

Run

JAVA-CP "bytemandemo2.jar;%classpath%" Com.vvvtimes.Main

Rule file Check for helper classes

BMCHECK-CP BYTEMANDEMO2.JAR-CP bytemanhelperdemo.jar-v SCRIPTS/TRACING.BTM

Byteman Run

JAVA-CP "Bytemandemo2.jar; bytemanhelperdemo.jar;%classpath% "-javaagent:%byteman_home%\lib\byteman.jar=script:scripts/tracing.btm Com.vvvtimes.Main

Run results

Byteman extension Helper Class for Java Reverse Foundation