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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <signal.h>
     18 #include <sys/types.h>
     19 #include <unistd.h>
     20 
     21 #include <binder/Binder.h>
     22 #include <binder/IBinder.h>
     23 #include <binder/IServiceManager.h>
     24 #include <binder/Parcel.h>
     25 #include <binder/ProcessState.h>
     26 
     27 #include <gtest/gtest.h>
     28 
     29 #include "Allocator.h"
     30 #include "Binder.h"
     31 
     32 namespace android {
     33 
     34 static const String16 service_name("test.libmemunreachable_binder");
     35 
     36 class BinderService : public BBinder {
     37  public:
     38   BinderService() = default;
     39   virtual ~BinderService() = default;
     40 
     41   virtual status_t onTransact(uint32_t /*code*/, const Parcel& data, Parcel* reply,
     42                               uint32_t /*flags*/ = 0) {
     43     reply->writeStrongBinder(ref);
     44     ref = data.readStrongBinder();
     45     return 0;
     46   }
     47 
     48  private:
     49   sp<IBinder> ref;
     50 };
     51 
     52 class BinderObject : public BBinder {
     53  public:
     54   BinderObject() = default;
     55   ~BinderObject() = default;
     56 };
     57 
     58 class ServiceProcess {
     59  public:
     60   ServiceProcess() : child_(0) {}
     61   ~ServiceProcess() { Stop(); }
     62 
     63   bool Run() {
     64     pid_t ret = fork();
     65     if (ret < 0) {
     66       return false;
     67     } else if (ret == 0) {
     68       // child
     69       _exit(Service());
     70     } else {
     71       // parent
     72       child_ = ret;
     73       return true;
     74     }
     75   }
     76 
     77   bool Stop() {
     78     if (child_ > 0) {
     79       if (kill(child_, SIGTERM)) {
     80         return false;
     81       }
     82       int status = 0;
     83       if (TEMP_FAILURE_RETRY(waitpid(child_, &status, 0)) != child_) {
     84         return false;
     85       }
     86       child_ = 0;
     87       return WIFEXITED(status) && WEXITSTATUS(status) == 0;
     88     }
     89 
     90     return true;
     91   }
     92 
     93   int Service() {
     94     sp<ProcessState> proc{ProcessState::self()};
     95     sp<IServiceManager> sm = defaultServiceManager();
     96     if (sm == nullptr) {
     97       fprintf(stderr, "Failed to get service manager\n");
     98       return 1;
     99     }
    100     if (sm->addService(service_name, new BinderService()) != OK) {
    101       fprintf(stderr, "Failed to add test service\n");
    102       return 1;
    103     }
    104     proc->startThreadPool();
    105     pause();
    106     return 0;
    107   }
    108 
    109  private:
    110   pid_t child_;
    111 };
    112 
    113 class BinderTest : public ::testing::Test {
    114  protected:
    115   ServiceProcess service_process_;
    116 };
    117 
    118 TEST_F(BinderTest, binder) {
    119   ServiceProcess service_process;
    120   ASSERT_TRUE(service_process.Run());
    121 
    122   sp<IServiceManager> sm = defaultServiceManager();
    123   ASSERT_TRUE(sm != nullptr);
    124 
    125   // A small sleep allows the service to start, which
    126   // prevents a longer sleep in getService.
    127   usleep(100000);
    128 
    129   sp<IBinder> service = sm->getService(service_name);
    130   ASSERT_TRUE(service != nullptr);
    131 
    132   sp<IBinder> binder{new BinderObject()};
    133 
    134   Parcel send;
    135   Parcel reply;
    136 
    137   send.writeStrongBinder(binder);
    138   status_t rv = service->transact(0, send, &reply);
    139   ASSERT_EQ(static_cast<status_t>(OK), rv);
    140 
    141   Heap heap;
    142   allocator::vector<uintptr_t> refs{heap};
    143 
    144   ASSERT_TRUE(BinderReferences(refs));
    145 
    146   bool found_ref = false;
    147   for (auto ref : refs) {
    148     if (ref == reinterpret_cast<uintptr_t>(binder.get())) {
    149       found_ref = true;
    150     }
    151   }
    152 
    153   ASSERT_TRUE(found_ref);
    154 }
    155 
    156 }  // namespace android
    157