ServiceUtilities.cpp revision 893a5642871114fca3b2a00c6ff8e5699ce3e3ed 
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#include <binder/IPCThreadState.h>
18#include <binder/IServiceManager.h>
19#include <binder/PermissionCache.h>
20#include "ServiceUtilities.h"
21
22namespace android {
23
24// Not valid until initialized by AudioFlinger constructor.  It would have to be
25// re-initialized if the process containing AudioFlinger service forks (which it doesn't).
26pid_t getpid_cached;
27
28bool recordingAllowed() {
29    if (getpid_cached == IPCThreadState::self()->getCallingPid()) return true;
30    static const String16 sRecordAudio("android.permission.RECORD_AUDIO");
31    // don't use PermissionCache; this is not a system permission
32    bool ok = checkCallingPermission(sRecordAudio);
33    if (!ok) ALOGE("Request requires android.permission.RECORD_AUDIO");
34    return ok;
35}
36
37bool captureAudioOutputAllowed() {
38    if (getpid_cached == IPCThreadState::self()->getCallingPid()) return true;
39    static const String16 sCaptureAudioOutput("android.permission.CAPTURE_AUDIO_OUTPUT");
40    // don't use PermissionCache; this is not a system permission
41    bool ok = checkCallingPermission(sCaptureAudioOutput);
42    if (!ok) ALOGE("Request requires android.permission.CAPTURE_AUDIO_OUTPUT");
43    return ok;
44}
45
46bool settingsAllowed() {
47    if (getpid_cached == IPCThreadState::self()->getCallingPid()) return true;
48    static const String16 sAudioSettings("android.permission.MODIFY_AUDIO_SETTINGS");
49    // don't use PermissionCache; this is not a system permission
50    bool ok = checkCallingPermission(sAudioSettings);
51    if (!ok) ALOGE("Request requires android.permission.MODIFY_AUDIO_SETTINGS");
52    return ok;
53}
54
55bool dumpAllowed() {
56    // don't optimize for same pid, since mediaserver never dumps itself
57    static const String16 sDump("android.permission.DUMP");
58    // OK to use PermissionCache; this is a system permission
59    bool ok = PermissionCache::checkCallingPermission(sDump);
60    // convention is for caller to dump an error message to fd instead of logging here
61    //if (!ok) ALOGE("Request requires android.permission.DUMP");
62    return ok;
63}
64
65} // namespace android
66