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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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.
*/
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
public class Linking {
public static boolean canAccess(String className, boolean takesParameter) throws Exception {
try {
Class<?> c = Class.forName(className);
if (takesParameter) {
c.getDeclaredMethod("access", Integer.TYPE).invoke(null, 42);
} else {
c.getDeclaredMethod("access").invoke(null);
}
return true;
} catch (InvocationTargetException ex) {
if (ex.getCause() instanceof NoSuchFieldError || ex.getCause() instanceof NoSuchMethodError) {
return false;
} else {
throw ex;
}
}
}
public static boolean canOverride(String methodName) throws Exception {
// ParentClass returns only positive numbers, OverrideClass only negative.
// This way we can tell if OverrideClass managed to override the original
// method or not.
Method method = ParentClass.class.getDeclaredMethod(methodName);
int result1 = (int) method.invoke(new ParentClass());
int result2 = (int) method.invoke(new OverrideClass());
return (result1 > 0) && (result2 < 0);
}
}
// INSTANCE FIELD GET
class LinkFieldGetWhitelist {
public static int access() {
return new ParentClass().fieldPublicWhitelist;
}
}
class LinkFieldGetLightGreylist {
public static int access() {
return new ParentClass().fieldPublicLightGreylist;
}
}
class LinkFieldGetDarkGreylist {
public static int access() {
return new ParentClass().fieldPublicDarkGreylist;
}
}
class LinkFieldGetBlacklist {
public static int access() {
return new ParentClass().fieldPublicBlacklist;
}
}
// INSTANCE FIELD SET
class LinkFieldSetWhitelist {
public static void access(int x) {
// Need to use a different field from the getter to bypass DexCache.
new ParentClass().fieldPublicWhitelistB = x;
}
}
class LinkFieldSetLightGreylist {
public static void access(int x) {
// Need to use a different field from the getter to bypass DexCache.
new ParentClass().fieldPublicLightGreylistB = x;
}
}
class LinkFieldSetDarkGreylist {
public static void access(int x) {
// Need to use a different field from the getter to bypass DexCache.
new ParentClass().fieldPublicDarkGreylistB = x;
}
}
class LinkFieldSetBlacklist {
public static void access(int x) {
// Need to use a different field from the getter to bypass DexCache.
new ParentClass().fieldPublicBlacklistB = x;
}
}
// STATIC FIELD GET
class LinkFieldGetStaticWhitelist {
public static int access() {
return ParentClass.fieldPublicStaticWhitelist;
}
}
class LinkFieldGetStaticLightGreylist {
public static int access() {
return ParentClass.fieldPublicStaticLightGreylist;
}
}
class LinkFieldGetStaticDarkGreylist {
public static int access() {
return ParentClass.fieldPublicStaticDarkGreylist;
}
}
class LinkFieldGetStaticBlacklist {
public static int access() {
return ParentClass.fieldPublicStaticBlacklist;
}
}
// STATIC FIELD SET
class LinkFieldSetStaticWhitelist {
public static void access(int x) {
// Need to use a different field from the getter to bypass DexCache.
ParentClass.fieldPublicStaticWhitelistB = x;
}
}
class LinkFieldSetStaticLightGreylist {
public static void access(int x) {
// Need to use a different field from the getter to bypass DexCache.
ParentClass.fieldPublicStaticLightGreylistB = x;
}
}
class LinkFieldSetStaticDarkGreylist {
public static void access(int x) {
// Need to use a different field from the getter to bypass DexCache.
ParentClass.fieldPublicStaticDarkGreylistB = x;
}
}
class LinkFieldSetStaticBlacklist {
public static void access(int x) {
// Need to use a different field from the getter to bypass DexCache.
ParentClass.fieldPublicStaticBlacklistB = x;
}
}
// INVOKE INSTANCE METHOD
class LinkMethodWhitelist {
public static int access() {
return new ParentClass().methodPublicWhitelist();
}
}
class LinkMethodLightGreylist {
public static int access() {
return new ParentClass().methodPublicLightGreylist();
}
}
class LinkMethodDarkGreylist {
public static int access() {
return new ParentClass().methodPublicDarkGreylist();
}
}
class LinkMethodBlacklist {
public static int access() {
return new ParentClass().methodPublicBlacklist();
}
}
// INVOKE STATIC METHOD
class LinkMethodStaticWhitelist {
public static int access() {
return ParentClass.methodPublicStaticWhitelist();
}
}
class LinkMethodStaticLightGreylist {
public static int access() {
return ParentClass.methodPublicStaticLightGreylist();
}
}
class LinkMethodStaticDarkGreylist {
public static int access() {
return ParentClass.methodPublicStaticDarkGreylist();
}
}
class LinkMethodStaticBlacklist {
public static int access() {
return ParentClass.methodPublicStaticBlacklist();
}
}
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