ServiceUtilities.cpp revision f53eaf49df1e1e1c01708919e9e0a046543de9b6 
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 captureHotwordAllowed() {
47    static const String16 sCaptureHotwordAllowed("android.permission.CAPTURE_AUDIO_HOTWORD");
48    bool ok = checkCallingPermission(sCaptureHotwordAllowed);
49    if (!ok) ALOGE("android.permission.CAPTURE_AUDIO_HOTWORD");
50    return ok;
51}
52
53bool captureFmTunerAllowed() {
54    static const String16 sCaptureFmTunerAllowed("android.permission.ACCESS_FM_RADIO");
55    bool ok = checkCallingPermission(sCaptureFmTunerAllowed);
56    if (!ok) ALOGE("android.permission.ACCESS_FM_RADIO");
57    return ok;
58}
59
60bool settingsAllowed() {
61    if (getpid_cached == IPCThreadState::self()->getCallingPid()) return true;
62    static const String16 sAudioSettings("android.permission.MODIFY_AUDIO_SETTINGS");
63    // don't use PermissionCache; this is not a system permission
64    bool ok = checkCallingPermission(sAudioSettings);
65    if (!ok) ALOGE("Request requires android.permission.MODIFY_AUDIO_SETTINGS");
66    return ok;
67}
68
69bool modifyAudioRoutingAllowed() {
70    static const String16 sModifyAudioRoutingAllowed("android.permission.MODIFY_AUDIO_ROUTING");
71    bool ok = checkCallingPermission(sModifyAudioRoutingAllowed);
72    if (!ok) ALOGE("android.permission.MODIFY_AUDIO_ROUTING");
73    return ok;
74}
75
76bool dumpAllowed() {
77    // don't optimize for same pid, since mediaserver never dumps itself
78    static const String16 sDump("android.permission.DUMP");
79    // OK to use PermissionCache; this is a system permission
80    bool ok = PermissionCache::checkCallingPermission(sDump);
81    // convention is for caller to dump an error message to fd instead of logging here
82    //if (!ok) ALOGE("Request requires android.permission.DUMP");
83    return ok;
84}
85
86} // namespace android
87