Dianne Hackborn | 354736e | 2016-08-22 17:00:05 -0700 | [diff] [blame^] | 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 | package android.os; |
| 18 | |
| 19 | import android.util.Log; |
| 20 | |
| 21 | import com.android.internal.os.IShellCallback; |
| 22 | |
| 23 | /** |
| 24 | * Special-purpose API for use with {@link IBinder#shellCommand IBinder.shellCommand} for |
| 25 | * performing operations back on the invoking shell. |
| 26 | * @hide |
| 27 | */ |
| 28 | public class ShellCallback implements Parcelable { |
| 29 | final static String TAG = "ShellCallback"; |
| 30 | |
| 31 | final static boolean DEBUG = false; |
| 32 | |
| 33 | final boolean mLocal; |
| 34 | |
| 35 | IShellCallback mShellCallback; |
| 36 | |
| 37 | class MyShellCallback extends IShellCallback.Stub { |
| 38 | public ParcelFileDescriptor openOutputFile(String path, String seLinuxContext) { |
| 39 | return onOpenOutputFile(path, seLinuxContext); |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * Create a new ShellCallback to receive requests. |
| 45 | */ |
| 46 | public ShellCallback() { |
| 47 | mLocal = true; |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Ask the shell to open a file for writing. This will truncate the file if it |
| 52 | * already exists. It will create the file if it doesn't exist. |
| 53 | * @param path Path of the file to be opened/created. |
| 54 | * @param seLinuxContext Optional SELinux context that must be allowed to have |
| 55 | * access to the file; if null, nothing is required. |
| 56 | */ |
| 57 | public ParcelFileDescriptor openOutputFile(String path, String seLinuxContext) { |
| 58 | if (DEBUG) Log.d(TAG, "openOutputFile " + this + ": mLocal=" + mLocal |
| 59 | + " mShellCallback=" + mShellCallback); |
| 60 | |
| 61 | if (mLocal) { |
| 62 | return onOpenOutputFile(path, seLinuxContext); |
| 63 | } |
| 64 | |
| 65 | if (mShellCallback != null) { |
| 66 | try { |
| 67 | return mShellCallback.openOutputFile(path, seLinuxContext); |
| 68 | } catch (RemoteException e) { |
| 69 | Log.w(TAG, "Failure opening " + path, e); |
| 70 | } |
| 71 | } |
| 72 | return null; |
| 73 | } |
| 74 | |
| 75 | public ParcelFileDescriptor onOpenOutputFile(String path, String seLinuxContext) { |
| 76 | return null; |
| 77 | } |
| 78 | |
| 79 | public static void writeToParcel(ShellCallback callback, Parcel out) { |
| 80 | if (callback == null) { |
| 81 | out.writeStrongBinder(null); |
| 82 | } else { |
| 83 | callback.writeToParcel(out, 0); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | public int describeContents() { |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | public void writeToParcel(Parcel out, int flags) { |
| 92 | synchronized (this) { |
| 93 | if (mShellCallback == null) { |
| 94 | mShellCallback = new MyShellCallback(); |
| 95 | } |
| 96 | out.writeStrongBinder(mShellCallback.asBinder()); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | ShellCallback(Parcel in) { |
| 101 | mLocal = false; |
| 102 | mShellCallback = IShellCallback.Stub.asInterface(in.readStrongBinder()); |
| 103 | } |
| 104 | |
| 105 | public static final Parcelable.Creator<ShellCallback> CREATOR |
| 106 | = new Parcelable.Creator<ShellCallback>() { |
| 107 | public ShellCallback createFromParcel(Parcel in) { |
| 108 | return new ShellCallback(in); |
| 109 | } |
| 110 | public ShellCallback[] newArray(int size) { |
| 111 | return new ShellCallback[size]; |
| 112 | } |
| 113 | }; |
| 114 | } |