1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 * Copyright (C) 2012-2016, The Linux Foundation. All rights reserved.
4 *
5 * Not a Contribution, Apache license notifications and license are
6 * retained for attribution purposes only.
7
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
11 *
12 *      http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 */
20
21#include <fcntl.h>
22#include <stdint.h>
23#include <sys/types.h>
24#include <binder/Parcel.h>
25#include <binder/IBinder.h>
26#include <binder/IInterface.h>
27#include <binder/IPCThreadState.h>
28#include <utils/Errors.h>
29#include <private/android_filesystem_config.h>
30#include <IQService.h>
31
32#define QSERVICE_DEBUG 0
33
34using namespace android;
35using namespace qClient;
36
37// ---------------------------------------------------------------------------
38
39namespace qService {
40
41class BpQService : public BpInterface<IQService>
42{
43public:
44    BpQService(const sp<IBinder>& impl)
45        : BpInterface<IQService>(impl) {}
46
47    virtual void connect(const sp<IQClient>& client) {
48        ALOGD_IF(QSERVICE_DEBUG, "%s: connect HWC client", __FUNCTION__);
49        Parcel data, reply;
50        data.writeInterfaceToken(IQService::getInterfaceDescriptor());
51        data.writeStrongBinder(IInterface::asBinder(client));
52        remote()->transact(CONNECT_HWC_CLIENT, data, &reply);
53    }
54
55    virtual void connect(const sp<IQHDMIClient>& client) {
56        ALOGD_IF(QSERVICE_DEBUG, "%s: connect HDMI client", __FUNCTION__);
57        Parcel data, reply;
58        data.writeInterfaceToken(IQService::getInterfaceDescriptor());
59        data.writeStrongBinder(IInterface::asBinder(client));
60        remote()->transact(CONNECT_HDMI_CLIENT, data, &reply);
61    }
62
63
64    virtual android::status_t dispatch(uint32_t command, const Parcel* inParcel,
65            Parcel* outParcel) {
66        ALOGD_IF(QSERVICE_DEBUG, "%s: dispatch in:%p", __FUNCTION__, inParcel);
67        status_t err = (status_t) android::FAILED_TRANSACTION;
68        Parcel data;
69        Parcel *reply = outParcel;
70        data.writeInterfaceToken(IQService::getInterfaceDescriptor());
71        if (inParcel && inParcel->dataSize() > 0)
72            data.appendFrom(inParcel, 0, inParcel->dataSize());
73        err = remote()->transact(command, data, reply);
74        return err;
75    }
76};
77
78IMPLEMENT_META_INTERFACE(QService, "android.display.IQService");
79
80// ----------------------------------------------------------------------
81
82status_t BnQService::onTransact(
83    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
84{
85    ALOGD_IF(QSERVICE_DEBUG, "%s: code: %d", __FUNCTION__, code);
86    // IPC should be from certain processes only
87    IPCThreadState* ipc = IPCThreadState::self();
88    const int callerPid = ipc->getCallingPid();
89    const int callerUid = ipc->getCallingUid();
90
91    const bool permission = (callerUid == AID_MEDIA ||
92            callerUid == AID_GRAPHICS ||
93            callerUid == AID_ROOT ||
94            callerUid == AID_CAMERASERVER ||
95            callerUid == AID_SYSTEM);
96
97    if (code == CONNECT_HWC_CLIENT) {
98        CHECK_INTERFACE(IQService, data, reply);
99        if(callerUid != AID_GRAPHICS) {
100            ALOGE("display.qservice CONNECT_HWC_CLIENT access denied: pid=%d uid=%d",
101                   callerPid, callerUid);
102            return PERMISSION_DENIED;
103        }
104        sp<IQClient> client =
105                interface_cast<IQClient>(data.readStrongBinder());
106        connect(client);
107        return NO_ERROR;
108    } else if(code == CONNECT_HDMI_CLIENT) {
109        CHECK_INTERFACE(IQService, data, reply);
110        if(callerUid != AID_SYSTEM && callerUid != AID_ROOT) {
111            ALOGE("display.qservice CONNECT_HDMI_CLIENT access denied: pid=%d uid=%d",
112                   callerPid, callerUid);
113            return PERMISSION_DENIED;
114        }
115        sp<IQHDMIClient> client =
116                interface_cast<IQHDMIClient>(data.readStrongBinder());
117        connect(client);
118        return NO_ERROR;
119    } else if (code > COMMAND_LIST_START && code < COMMAND_LIST_END) {
120        if(!permission) {
121            ALOGE("display.qservice access denied: command=%d pid=%d uid=%d",
122                   code, callerPid, callerUid);
123            return PERMISSION_DENIED;
124        }
125        CHECK_INTERFACE(IQService, data, reply);
126        dispatch(code, &data, reply);
127        return NO_ERROR;
128    } else {
129        return BBinder::onTransact(code, data, reply, flags);
130    }
131}
132
133}; // namespace qService
134