1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 * Copyright (C) 2012-2014, 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
34 using namespace android;
35 using namespace qClient;
36
37 // ---------------------------------------------------------------------------
38
39 namespace qService {
40
41 class BpQService : public BpInterface<IQService>
42 {
43 public:
BpQService(const sp<IBinder> & impl)44 BpQService(const sp<IBinder>& impl)
45 : BpInterface<IQService>(impl) {}
46
connect(const sp<IQClient> & client)47 virtual void connect(const sp<IQClient>& client) {
48 ALOGD_IF(QSERVICE_DEBUG, "%s: connect client", __FUNCTION__);
49 Parcel data, reply;
50 data.writeInterfaceToken(IQService::getInterfaceDescriptor());
51 data.writeStrongBinder(IInterface::asBinder(client));
52 remote()->transact(CONNECT, data, &reply);
53 }
54
dispatch(uint32_t command,const Parcel * inParcel,Parcel * outParcel)55 virtual android::status_t dispatch(uint32_t command, const Parcel* inParcel,
56 Parcel* outParcel) {
57 ALOGD_IF(QSERVICE_DEBUG, "%s: dispatch in:%p", __FUNCTION__, inParcel);
58 status_t err = (status_t) android::FAILED_TRANSACTION;
59 Parcel data;
60 Parcel *reply = outParcel;
61 data.writeInterfaceToken(IQService::getInterfaceDescriptor());
62 if (inParcel && inParcel->dataSize() > 0)
63 data.appendFrom(inParcel, 0, inParcel->dataSize());
64 err = remote()->transact(command, data, reply);
65 return err;
66 }
67 };
68
69 IMPLEMENT_META_INTERFACE(QService, "android.display.IQService");
70
71 // ----------------------------------------------------------------------
72
73 static void getProcName(int pid, char *buf, int size);
74
onTransact(uint32_t code,const Parcel & data,Parcel * reply,uint32_t flags)75 status_t BnQService::onTransact(
76 uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
77 {
78 ALOGD_IF(QSERVICE_DEBUG, "%s: code: %d", __FUNCTION__, code);
79 // IPC should be from certain processes only
80 IPCThreadState* ipc = IPCThreadState::self();
81 const int callerPid = ipc->getCallingPid();
82 const int callerUid = ipc->getCallingUid();
83 const int MAX_BUF_SIZE = 1024;
84 char callingProcName[MAX_BUF_SIZE] = {0};
85
86 getProcName(callerPid, callingProcName, MAX_BUF_SIZE);
87
88 const bool permission = (callerUid == AID_MEDIA ||
89 callerUid == AID_GRAPHICS ||
90 callerUid == AID_ROOT ||
91 callerUid == AID_SYSTEM);
92
93 if (code == CONNECT) {
94 CHECK_INTERFACE(IQService, data, reply);
95 if(callerUid != AID_GRAPHICS) {
96 ALOGE("display.qservice CONNECT access denied: \
97 pid=%d uid=%d process=%s",
98 callerPid, callerUid, callingProcName);
99 return PERMISSION_DENIED;
100 }
101 sp<IQClient> client =
102 interface_cast<IQClient>(data.readStrongBinder());
103 connect(client);
104 return NO_ERROR;
105 } else if (code > COMMAND_LIST_START && code < COMMAND_LIST_END) {
106 if(!permission) {
107 ALOGE("display.qservice access denied: command=%d\
108 pid=%d uid=%d process=%s", code, callerPid,
109 callerUid, callingProcName);
110 return PERMISSION_DENIED;
111 }
112 CHECK_INTERFACE(IQService, data, reply);
113 dispatch(code, &data, reply);
114 return NO_ERROR;
115 } else {
116 return BBinder::onTransact(code, data, reply, flags);
117 }
118 }
119
120 //Helper
getProcName(int pid,char * buf,int size)121 static void getProcName(int pid, char *buf, int size) {
122 int fd = -1;
123 snprintf(buf, size, "/proc/%d/cmdline", pid);
124 fd = open(buf, O_RDONLY);
125 if (fd < 0) {
126 strlcpy(buf, "Unknown", size);
127 } else {
128 ssize_t len = read(fd, buf, size - 1);
129 if (len >= 0)
130 buf[len] = 0;
131
132 close(fd);
133 }
134 }
135
136 }; // namespace qService
137