jadex.bytecode.vmhacks

Class NativeHelper

java.lang.Object

jadex.bytecode.vmhacks.NativeHelper

All Implemented Interfaces:

INativeHelper

public final class NativeHelper
extends java.lang.Object
implements INativeHelper

Helper class using JNA to provide native features.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NativeHelper() Create helper.

Method Summary

Modifier and Type	Method and Description
boolean	canSetAccessible() Tests if the setAccessible() method can be used.
java.lang.Class<?>	defineClass(java.lang.String name, byte[] b, java.lang.ClassLoader loader) Define a class in any ClassLoader.
boolean	isRootAdmin() Tests if the JVM is running as root/admin.
static void	main(java.lang.String[] args) Test main
void	setAccessible(java.lang.String flagname, java.lang.reflect.AccessibleObject accobj, boolean flag) Sets reflective object accessible without checks.
boolean	startInstrumentationAgent(java.lang.String jarfile) Method for starting an instrumentation agent.
boolean	tryChangeUser(java.lang.String username) Attempts to change the user of the process to the given name.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NativeHelper

protected NativeHelper()

Create helper.

Method Detail

setAccessible

public void setAccessible(java.lang.String flagname,
                          java.lang.reflect.AccessibleObject accobj,
                          boolean flag)

Sets reflective object accessible without checks.

Specified by:

setAccessible in interface INativeHelper

Parameters:

accobj - The accessible object.

flag - The flag value.

canSetAccessible

public boolean canSetAccessible()

Tests if the setAccessible() method can be used.

Specified by:

canSetAccessible in interface INativeHelper

Returns:

True, if method can be used.

defineClass

public java.lang.Class<?> defineClass(java.lang.String name,
                                      byte[] b,
                                      java.lang.ClassLoader loader)

Define a class in any ClassLoader.

Specified by:

defineClass in interface INativeHelper

tryChangeUser

public boolean tryChangeUser(java.lang.String username)

Attempts to change the user of the process to the given name.

Specified by:

tryChangeUser in interface INativeHelper

Parameters:

username - The target user name.

Returns:

True, if successful, false if the attempt probably failed.

isRootAdmin

public boolean isRootAdmin()

Tests if the JVM is running as root/admin.

Returns:

True, if running as root.

startInstrumentationAgent

public boolean startInstrumentationAgent(java.lang.String jarfile)

Method for starting an instrumentation agent.

Specified by:

startInstrumentationAgent in interface INativeHelper

Parameters:

jarfile - The path to the jar file of the agent.

Returns:

True, on successful start.

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Test main

Throws:

java.lang.Exception