1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Binder;
import android.os.Handler;
import android.os.IBinder;
import android.os.IUpdateLock;
import android.os.RemoteException;
import android.os.SystemClock;
import android.os.TokenWatcher;
import android.os.UpdateLock;
import android.os.UserHandle;
import android.util.Slog;
import java.io.FileDescriptor;
import java.io.PrintWriter;
public class UpdateLockService extends IUpdateLock.Stub {
static final boolean DEBUG = false;
static final String TAG = "UpdateLockService";
// signatureOrSystem required to use update locks
static final String PERMISSION = "android.permission.UPDATE_LOCK";
Context mContext;
LockWatcher mLocks;
class LockWatcher extends TokenWatcher {
LockWatcher(Handler h, String tag) {
super(h, tag);
}
public void acquired() {
if (DEBUG) {
Slog.d(TAG, "first acquire; broadcasting convenient=false");
}
sendLockChangedBroadcast(false);
}
public void released() {
if (DEBUG) {
Slog.d(TAG, "last release; broadcasting convenient=true");
}
sendLockChangedBroadcast(true);
}
}
UpdateLockService(Context context) {
mContext = context;
mLocks = new LockWatcher(new Handler(), "UpdateLocks");
// Consider just-booting to be a reasonable time to allow
// interruptions for update installation etc.
sendLockChangedBroadcast(true);
}
void sendLockChangedBroadcast(boolean state) {
// Safe early during boot because this broadcast only goes to registered receivers.
long oldIdent = Binder.clearCallingIdentity();
try {
Intent intent = new Intent(UpdateLock.UPDATE_LOCK_CHANGED)
.putExtra(UpdateLock.NOW_IS_CONVENIENT, state)
.putExtra(UpdateLock.TIMESTAMP, System.currentTimeMillis())
.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
mContext.sendStickyBroadcastAsUser(intent, UserHandle.ALL);
} finally {
Binder.restoreCallingIdentity(oldIdent);
}
}
@Override
public void acquireUpdateLock(IBinder token, String tag) throws RemoteException {
if (DEBUG) {
Slog.d(TAG, "acquire(" + token + ") by " + makeTag(tag));
}
mContext.enforceCallingOrSelfPermission(PERMISSION, "acquireUpdateLock");
mLocks.acquire(token, makeTag(tag));
}
@Override
public void releaseUpdateLock(IBinder token) throws RemoteException {
if (DEBUG) {
Slog.d(TAG, "release(" + token + ')');
}
mContext.enforceCallingOrSelfPermission(PERMISSION, "releaseUpdateLock");
mLocks.release(token);
};
private String makeTag(String tag) {
return "{tag=" + tag
+ " uid=" + Binder.getCallingUid()
+ " pid=" + Binder.getCallingPid() + '}';
}
@Override
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
!= PackageManager.PERMISSION_GRANTED) {
pw.println("Permission Denial: can't dump update lock service from from pid="
+ Binder.getCallingPid()
+ ", uid=" + Binder.getCallingUid());
return;
}
mLocks.dump(pw);
}
}
|
