IPermissionController.cpp revision c5b2c0bf8007562536b822eb060fc54a01f8e08b 
1/*
2 * Copyright (C) 2005 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#define LOG_TAG "PermissionController"
18
19#include <binder/IPermissionController.h>
20
21#include <utils/Debug.h>
22#include <utils/Log.h>
23#include <binder/Parcel.h>
24#include <utils/String8.h>
25
26#include <private/binder/Static.h>
27
28namespace android {
29
30// ----------------------------------------------------------------------
31
32class BpPermissionController : public BpInterface<IPermissionController>
33{
34public:
35    BpPermissionController(const sp<IBinder>& impl)
36        : BpInterface<IPermissionController>(impl)
37    {
38    }
39
40    virtual bool checkPermission(const String16& permission, int32_t pid, int32_t uid)
41    {
42        Parcel data, reply;
43        data.writeInterfaceToken(IPermissionController::getInterfaceDescriptor());
44        data.writeString16(permission);
45        data.writeInt32(pid);
46        data.writeInt32(uid);
47        remote()->transact(CHECK_PERMISSION_TRANSACTION, data, &reply);
48        // fail on exception
49        if (reply.readInt32() != 0) return 0;
50        return reply.readInt32() != 0;
51    }
52};
53
54IMPLEMENT_META_INTERFACE(PermissionController, "android.os.IPermissionController");
55
56// ----------------------------------------------------------------------
57
58#define CHECK_INTERFACE(interface, data, reply) \
59        do { if (!data.enforceInterface(interface::getInterfaceDescriptor())) { \
60            LOGW("Call incorrectly routed to " #interface); \
61            return PERMISSION_DENIED; \
62        } } while (0)
63
64status_t BnPermissionController::onTransact(
65    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
66{
67    //printf("PermissionController received: "); data.print();
68    switch(code) {
69        case CHECK_PERMISSION_TRANSACTION: {
70            CHECK_INTERFACE(IPermissionController, data, reply);
71            String16 permission = data.readString16();
72            int32_t pid = data.readInt32();
73            int32_t uid = data.readInt32();
74            bool res = checkPermission(permission, pid, uid);
75            // write exception
76            reply->writeInt32(0);
77            reply->writeInt32(res ? 1 : 0);
78            return NO_ERROR;
79        } break;
80        default:
81            return BBinder::onTransact(code, data, reply, flags);
82    }
83}
84
85}; // namespace android
86
87