Christopher Tate | 8662cab5 | 2012-02-23 14:59:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 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 com.android.server; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.content.Intent; |
| 21 | import android.content.pm.PackageManager; |
| 22 | import android.os.Binder; |
| 23 | import android.os.Handler; |
| 24 | import android.os.IBinder; |
| 25 | import android.os.IUpdateLock; |
| 26 | import android.os.RemoteException; |
Christopher Tate | 8662cab5 | 2012-02-23 14:59:36 -0800 | [diff] [blame] | 27 | import android.os.TokenWatcher; |
| 28 | import android.os.UpdateLock; |
Dianne Hackborn | 5ac72a2 | 2012-08-29 18:32:08 -0700 | [diff] [blame] | 29 | import android.os.UserHandle; |
Christopher Tate | 8662cab5 | 2012-02-23 14:59:36 -0800 | [diff] [blame] | 30 | import android.util.Slog; |
| 31 | |
| 32 | import java.io.FileDescriptor; |
| 33 | import java.io.PrintWriter; |
| 34 | |
| 35 | public class UpdateLockService extends IUpdateLock.Stub { |
| 36 | static final boolean DEBUG = false; |
| 37 | static final String TAG = "UpdateLockService"; |
| 38 | |
| 39 | // signatureOrSystem required to use update locks |
| 40 | static final String PERMISSION = "android.permission.UPDATE_LOCK"; |
| 41 | |
| 42 | Context mContext; |
| 43 | LockWatcher mLocks; |
| 44 | |
| 45 | class LockWatcher extends TokenWatcher { |
| 46 | LockWatcher(Handler h, String tag) { |
| 47 | super(h, tag); |
| 48 | } |
| 49 | |
| 50 | public void acquired() { |
| 51 | if (DEBUG) { |
| 52 | Slog.d(TAG, "first acquire; broadcasting convenient=false"); |
| 53 | } |
| 54 | sendLockChangedBroadcast(false); |
| 55 | } |
| 56 | public void released() { |
| 57 | if (DEBUG) { |
| 58 | Slog.d(TAG, "last release; broadcasting convenient=true"); |
| 59 | } |
| 60 | sendLockChangedBroadcast(true); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | UpdateLockService(Context context) { |
| 65 | mContext = context; |
| 66 | mLocks = new LockWatcher(new Handler(), "UpdateLocks"); |
| 67 | |
| 68 | // Consider just-booting to be a reasonable time to allow |
| 69 | // interruptions for update installation etc. |
| 70 | sendLockChangedBroadcast(true); |
| 71 | } |
| 72 | |
| 73 | void sendLockChangedBroadcast(boolean state) { |
| 74 | // Safe early during boot because this broadcast only goes to registered receivers. |
| 75 | long oldIdent = Binder.clearCallingIdentity(); |
| 76 | try { |
| 77 | Intent intent = new Intent(UpdateLock.UPDATE_LOCK_CHANGED) |
| 78 | .putExtra(UpdateLock.NOW_IS_CONVENIENT, state) |
| 79 | .putExtra(UpdateLock.TIMESTAMP, System.currentTimeMillis()) |
Christopher Tate | 5bb59da | 2012-03-01 12:39:25 -0800 | [diff] [blame] | 80 | .addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); |
Dianne Hackborn | 5ac72a2 | 2012-08-29 18:32:08 -0700 | [diff] [blame] | 81 | mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL); |
Christopher Tate | 8662cab5 | 2012-02-23 14:59:36 -0800 | [diff] [blame] | 82 | } finally { |
| 83 | Binder.restoreCallingIdentity(oldIdent); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | @Override |
| 88 | public void acquireUpdateLock(IBinder token, String tag) throws RemoteException { |
| 89 | if (DEBUG) { |
| 90 | Slog.d(TAG, "acquire(" + token + ") by " + makeTag(tag)); |
| 91 | } |
| 92 | |
| 93 | mContext.enforceCallingOrSelfPermission(PERMISSION, "acquireUpdateLock"); |
| 94 | mLocks.acquire(token, makeTag(tag)); |
| 95 | } |
| 96 | |
| 97 | @Override |
| 98 | public void releaseUpdateLock(IBinder token) throws RemoteException { |
| 99 | if (DEBUG) { |
| 100 | Slog.d(TAG, "release(" + token + ')'); |
| 101 | } |
| 102 | |
| 103 | mContext.enforceCallingOrSelfPermission(PERMISSION, "releaseUpdateLock"); |
| 104 | mLocks.release(token); |
| 105 | }; |
| 106 | |
| 107 | private String makeTag(String tag) { |
| 108 | return "{tag=" + tag |
| 109 | + " uid=" + Binder.getCallingUid() |
| 110 | + " pid=" + Binder.getCallingPid() + '}'; |
| 111 | } |
| 112 | |
| 113 | @Override |
| 114 | public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| 115 | if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) |
| 116 | != PackageManager.PERMISSION_GRANTED) { |
| 117 | pw.println("Permission Denial: can't dump update lock service from from pid=" |
| 118 | + Binder.getCallingPid() |
| 119 | + ", uid=" + Binder.getCallingUid()); |
| 120 | return; |
| 121 | } |
| 122 | |
| 123 | mLocks.dump(pw); |
| 124 | } |
| 125 | } |