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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 #define LOG_TAG "ShellCallback"
     18 
     19 #include <unistd.h>
     20 #include <fcntl.h>
     21 
     22 #include <binder/IShellCallback.h>
     23 
     24 #include <utils/Log.h>
     25 #include <binder/Parcel.h>
     26 #include <utils/String8.h>
     27 
     28 #include <private/binder/Static.h>
     29 
     30 namespace android {
     31 
     32 // ----------------------------------------------------------------------
     33 
     34 class BpShellCallback : public BpInterface<IShellCallback>
     35 {
     36 public:
     37     explicit BpShellCallback(const sp<IBinder>& impl)
     38         : BpInterface<IShellCallback>(impl)
     39     {
     40     }
     41 
     42     virtual int openFile(const String16& path, const String16& seLinuxContext,
     43             const String16& mode) {
     44         Parcel data, reply;
     45         data.writeInterfaceToken(IShellCallback::getInterfaceDescriptor());
     46         data.writeString16(path);
     47         data.writeString16(seLinuxContext);
     48         data.writeString16(mode);
     49         remote()->transact(OP_OPEN_OUTPUT_FILE, data, &reply, 0);
     50         reply.readExceptionCode();
     51         int fd = reply.readParcelFileDescriptor();
     52         return fd >= 0 ? fcntl(fd, F_DUPFD_CLOEXEC, 0) : fd;
     53 
     54     }
     55 };
     56 
     57 IMPLEMENT_META_INTERFACE(ShellCallback, "com.android.internal.os.IShellCallback");
     58 
     59 // ----------------------------------------------------------------------
     60 
     61 // NOLINTNEXTLINE(google-default-arguments)
     62 status_t BnShellCallback::onTransact(
     63     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
     64 {
     65     switch(code) {
     66         case OP_OPEN_OUTPUT_FILE: {
     67             CHECK_INTERFACE(IShellCallback, data, reply);
     68             String16 path(data.readString16());
     69             String16 seLinuxContext(data.readString16());
     70             String16 mode(data.readString16());
     71             int fd = openFile(path, seLinuxContext, mode);
     72             if (reply != nullptr) {
     73                 reply->writeNoException();
     74                 if (fd >= 0) {
     75                     reply->writeInt32(1);
     76                     reply->writeParcelFileDescriptor(fd, true);
     77                 } else {
     78                     reply->writeInt32(0);
     79                 }
     80             } else if (fd >= 0) {
     81                 close(fd);
     82             }
     83             return NO_ERROR;
     84         } break;
     85         default:
     86             return BBinder::onTransact(code, data, reply, flags);
     87     }
     88 }
     89 
     90 }; // namespace android
     91