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// Copyright 2021 Code Intelligence GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.code_intelligence.jazzer.instrumentor;
import com.code_intelligence.jazzer.api.HookType;
import com.code_intelligence.jazzer.api.MethodHook;
import java.lang.invoke.MethodHandle;
public class AfterHooks {
static AfterHooksTargetContract instance;
@MethodHook(type = HookType.AFTER,
targetClassName = "com.code_intelligence.jazzer.instrumentor.AfterHooksTarget",
targetMethod = "func1")
public static void
patchFunc1(
MethodHandle method, Object thisObject, Object[] arguments, int hookId, Object returnValue) {
instance = (AfterHooksTargetContract) thisObject;
((AfterHooksTargetContract) thisObject).registerHasFunc1BeenCalled();
}
@MethodHook(type = HookType.AFTER,
targetClassName = "com.code_intelligence.jazzer.instrumentor.AfterHooksTarget",
targetMethod = "registerTimesCalled", targetMethodDescriptor = "()V")
public static void
patchRegisterTimesCalled(MethodHandle method, Object thisObject, Object[] arguments, int hookId,
Object returnValue) throws Throwable {
// Invoke registerTimesCalled() again to pass the test.
method.invoke();
}
@MethodHook(type = HookType.AFTER,
targetClassName = "com.code_intelligence.jazzer.instrumentor.AfterHooksTarget",
targetMethod = "getFirstSecret", targetMethodDescriptor = "()Ljava/lang/String;")
public static void
patchGetFirstSecret(
MethodHandle method, Object thisObject, Object[] arguments, int hookId, String returnValue) {
// Use the returned secret to pass the test.
((AfterHooksTargetContract) thisObject).verifyFirstSecret(returnValue);
}
@MethodHook(type = HookType.AFTER,
targetClassName = "com.code_intelligence.jazzer.instrumentor.AfterHooksTarget",
targetMethod = "getSecondSecret")
public static void
patchGetSecondSecret(
MethodHandle method, Object thisObject, Object[] arguments, int hookId, Object returnValue) {
// Use the returned secret to pass the test.
((AfterHooksTargetContract) thisObject).verifySecondSecret((String) returnValue);
}
// Verify the interaction of a BEFORE and an AFTER hook. The BEFORE hook modifies the argument of
// the StringBuilder constructor.
@MethodHook(
type = HookType.BEFORE, targetClassName = "java.lang.StringBuilder", targetMethod = "<init>")
public static void
patchStringBuilderBeforeInit(
MethodHandle method, Object thisObject, Object[] arguments, int hookId) {
arguments[0] = "hunter3";
}
@MethodHook(
type = HookType.AFTER, targetClassName = "java.lang.StringBuilder", targetMethod = "<init>")
public static void
patchStringBuilderInit(
MethodHandle method, Object thisObject, Object[] arguments, int hookId, Object returnValue) {
String secret = ((StringBuilder) thisObject).toString();
// Verify that the argument passed to this AFTER hook agrees with the argument passed to the
// StringBuilder constructor, which has been modified by the BEFORE hook.
if (secret.equals(arguments[0])) {
// Verify that the argument has been modified to the correct value "hunter3".
instance.verifyThirdSecret(secret);
}
}
}
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