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:
BpShellCallback(const sp<IBinder> & impl)37 explicit BpShellCallback(const sp<IBinder>& impl)
38 : BpInterface<IShellCallback>(impl)
39 {
40 }
41
openOutputFile(const String16 & path,const String16 & seLinuxContext)42 virtual int openOutputFile(const String16& path, const String16& seLinuxContext) {
43 Parcel data, reply;
44 data.writeInterfaceToken(IShellCallback::getInterfaceDescriptor());
45 data.writeString16(path);
46 data.writeString16(seLinuxContext);
47 remote()->transact(OP_OPEN_OUTPUT_FILE, data, &reply, 0);
48 reply.readExceptionCode();
49 int fd = reply.readParcelFileDescriptor();
50 return fd >= 0 ? fcntl(fd, F_DUPFD_CLOEXEC, 0) : fd;
51
52 }
53 };
54
55 IMPLEMENT_META_INTERFACE(ShellCallback, "com.android.internal.os.IShellCallback");
56
57 // ----------------------------------------------------------------------
58
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 int fd = openOutputFile(path, seLinuxContext);
68 if (reply != NULL) {
69 reply->writeNoException();
70 if (fd >= 0) {
71 reply->writeInt32(1);
72 reply->writeParcelFileDescriptor(fd, true);
73 } else {
74 reply->writeInt32(0);
75 }
76 } else if (fd >= 0) {
77 close(fd);
78 }
79 return NO_ERROR;
80 } break;
81 default:
82 return BBinder::onTransact(code, data, reply, flags);
83 }
84 }
85
86 }; // namespace android
87