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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.
*/
#include <android-base/logging.h>
#include <android/binder_manager.h>
#include <iface/iface.h>
#include <android/binder_auto_utils.h>
#include "../../Utils.h"
using ::android::sp;
using ::android::wp;
const char* IFoo::kSomeInstanceName = "libbinder_ndk-test-IFoo";
const char* IFoo::kInstanceNameToDieFor = "libbinder_ndk-test-IFoo-to-die";
const char* IFoo::kIFooDescriptor = "my-special-IFoo-class";
struct IFoo_Class_Data {
sp<IFoo> foo;
};
void* IFoo_Class_onCreate(void* args) {
IFoo_Class_Data* foo = static_cast<IFoo_Class_Data*>(args);
// This is a foo, but we're currently not verifying that. So, the method newLocalBinder is
// coupled with this.
return static_cast<void*>(foo);
}
void IFoo_Class_onDestroy(void* userData) {
delete static_cast<IFoo_Class_Data*>(userData);
}
binder_status_t IFoo_Class_onTransact(AIBinder* binder, transaction_code_t code, const AParcel* in,
AParcel* out) {
binder_status_t stat = STATUS_FAILED_TRANSACTION;
sp<IFoo> foo = static_cast<IFoo_Class_Data*>(AIBinder_getUserData(binder))->foo;
CHECK(foo != nullptr) << "Transaction made on already deleted object";
switch (code) {
case IFoo::DOFOO: {
int32_t valueIn;
int32_t valueOut;
stat = AParcel_readInt32(in, &valueIn);
if (stat != STATUS_OK) break;
stat = foo->doubleNumber(valueIn, &valueOut);
if (stat != STATUS_OK) break;
stat = AParcel_writeInt32(out, valueOut);
break;
}
case IFoo::DIE: {
stat = foo->die();
break;
}
}
return stat;
}
AIBinder_Class* IFoo::kClass = AIBinder_Class_define(kIFooDescriptor, IFoo_Class_onCreate,
IFoo_Class_onDestroy, IFoo_Class_onTransact);
// Defines the same class. Ordinarly, you would never want to do this, but it's done here
// to simulate what would happen when multiple linker namespaces interact.
AIBinder_Class* IFoo::kClassDupe = AIBinder_Class_define(
kIFooDescriptor, IFoo_Class_onCreate, IFoo_Class_onDestroy, IFoo_Class_onTransact);
class BpFoo : public IFoo {
public:
explicit BpFoo(AIBinder* binder) : mBinder(binder) {}
virtual ~BpFoo() { AIBinder_decStrong(mBinder); }
virtual binder_status_t doubleNumber(int32_t in, int32_t* out) {
binder_status_t stat = STATUS_OK;
AParcel* parcelIn;
stat = AIBinder_prepareTransaction(mBinder, &parcelIn);
if (stat != STATUS_OK) return stat;
stat = AParcel_writeInt32(parcelIn, in);
if (stat != STATUS_OK) return stat;
::ndk::ScopedAParcel parcelOut;
stat = AIBinder_transact(mBinder, IFoo::DOFOO, &parcelIn, parcelOut.getR(), 0 /*flags*/);
if (stat != STATUS_OK) return stat;
stat = AParcel_readInt32(parcelOut.get(), out);
if (stat != STATUS_OK) return stat;
return stat;
}
virtual binder_status_t die() {
binder_status_t stat = STATUS_OK;
AParcel* parcelIn;
stat = AIBinder_prepareTransaction(mBinder, &parcelIn);
::ndk::ScopedAParcel parcelOut;
stat = AIBinder_transact(mBinder, IFoo::DIE, &parcelIn, parcelOut.getR(), 0 /*flags*/);
return stat;
}
private:
// Always assumes one refcount
AIBinder* mBinder;
};
IFoo::~IFoo() {
AIBinder_Weak_delete(mWeakBinder);
}
AIBinder* IFoo::getBinder() {
AIBinder* binder = nullptr;
if (mWeakBinder != nullptr) {
// one strong ref count of binder
binder = AIBinder_Weak_promote(mWeakBinder);
}
if (binder == nullptr) {
// or one strong refcount here
binder = AIBinder_new(IFoo::kClass, static_cast<void*>(new IFoo_Class_Data{this}));
if (mWeakBinder != nullptr) {
AIBinder_Weak_delete(mWeakBinder);
}
mWeakBinder = AIBinder_Weak_new(binder);
// WARNING: it is important that this class does not implement debug or
// shell functions because it does not use special C++ wrapper
// functions, and so this is how we test those functions.
}
return binder;
}
binder_status_t IFoo::addService(const char* instance) {
AIBinder* binder = getBinder();
binder_status_t status = AServiceManager_addService(binder, instance);
// Strong references we care about kept by remote process
AIBinder_decStrong(binder);
return status;
}
sp<IFoo> IFoo::getService(const char* instance, AIBinder** outBinder) {
LIBBINDER_IGNORE("-Wdeprecated-declarations")
AIBinder* binder = AServiceManager_getService(instance); // maybe nullptr
LIBBINDER_IGNORE_END()
if (binder == nullptr) {
return nullptr;
}
if (!AIBinder_associateClass(binder, IFoo::kClass)) {
AIBinder_decStrong(binder);
return nullptr;
}
if (outBinder != nullptr) {
AIBinder_incStrong(binder);
*outBinder = binder;
}
if (AIBinder_isRemote(binder)) {
sp<IFoo> ret = new BpFoo(binder); // takes ownership of binder
return ret;
}
IFoo_Class_Data* data = static_cast<IFoo_Class_Data*>(AIBinder_getUserData(binder));
CHECK(data != nullptr); // always created with non-null data
sp<IFoo> ret = data->foo;
AIBinder* held = AIBinder_Weak_promote(ret->mWeakBinder);
CHECK(held == binder);
AIBinder_decStrong(held);
AIBinder_decStrong(binder);
return ret;
}
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