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