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/*
* Copyright (C) 2010 The Android Open Source Project
* Copyright (C) 2012-2014, The Linux Foundation. All rights reserved.
*
* Not a Contribution, Apache license notifications and license are
* retained for attribution purposes only.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <fcntl.h>
#include <stdint.h>
#include <sys/types.h>
#include <binder/Parcel.h>
#include <binder/IBinder.h>
#include <binder/IInterface.h>
#include <binder/IPCThreadState.h>
#include <utils/Errors.h>
#include <private/android_filesystem_config.h>
#include <IQService.h>
#define QSERVICE_DEBUG 0
using namespace android;
using namespace qClient;
// ---------------------------------------------------------------------------
namespace qService {
class BpQService : public BpInterface<IQService>
{
public:
BpQService(const sp<IBinder>& impl)
: BpInterface<IQService>(impl) {}
virtual void connect(const sp<IQClient>& client) {
ALOGD_IF(QSERVICE_DEBUG, "%s: connect client", __FUNCTION__);
Parcel data, reply;
data.writeInterfaceToken(IQService::getInterfaceDescriptor());
data.writeStrongBinder(IInterface::asBinder(client));
remote()->transact(CONNECT, data, &reply);
}
virtual android::status_t dispatch(uint32_t command, const Parcel* inParcel,
Parcel* outParcel) {
ALOGD_IF(QSERVICE_DEBUG, "%s: dispatch in:%p", __FUNCTION__, inParcel);
status_t err = (status_t) android::FAILED_TRANSACTION;
Parcel data;
Parcel *reply = outParcel;
data.writeInterfaceToken(IQService::getInterfaceDescriptor());
if (inParcel && inParcel->dataSize() > 0)
data.appendFrom(inParcel, 0, inParcel->dataSize());
err = remote()->transact(command, data, reply);
return err;
}
};
IMPLEMENT_META_INTERFACE(QService, "android.display.IQService");
// ----------------------------------------------------------------------
static void getProcName(int pid, char *buf, int size);
status_t BnQService::onTransact(
uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
ALOGD_IF(QSERVICE_DEBUG, "%s: code: %d", __FUNCTION__, code);
// IPC should be from certain processes only
IPCThreadState* ipc = IPCThreadState::self();
const int callerPid = ipc->getCallingPid();
const int callerUid = ipc->getCallingUid();
const int MAX_BUF_SIZE = 1024;
char callingProcName[MAX_BUF_SIZE] = {0};
getProcName(callerPid, callingProcName, MAX_BUF_SIZE);
const bool permission = (callerUid == AID_MEDIA ||
callerUid == AID_GRAPHICS ||
callerUid == AID_ROOT ||
callerUid == AID_SYSTEM);
if (code == CONNECT) {
CHECK_INTERFACE(IQService, data, reply);
if(callerUid != AID_GRAPHICS) {
ALOGE("display.qservice CONNECT access denied: \
pid=%d uid=%d process=%s",
callerPid, callerUid, callingProcName);
return PERMISSION_DENIED;
}
sp<IQClient> client =
interface_cast<IQClient>(data.readStrongBinder());
connect(client);
return NO_ERROR;
} else if (code > COMMAND_LIST_START && code < COMMAND_LIST_END) {
if(!permission) {
ALOGE("display.qservice access denied: command=%d\
pid=%d uid=%d process=%s", code, callerPid,
callerUid, callingProcName);
return PERMISSION_DENIED;
}
CHECK_INTERFACE(IQService, data, reply);
dispatch(code, &data, reply);
return NO_ERROR;
} else {
return BBinder::onTransact(code, data, reply, flags);
}
}
//Helper
static void getProcName(int pid, char *buf, int size) {
int fd = -1;
snprintf(buf, size, "/proc/%d/cmdline", pid);
fd = open(buf, O_RDONLY);
if (fd < 0) {
strlcpy(buf, "Unknown", size);
} else {
ssize_t len = read(fd, buf, size - 1);
if (len >= 0)
buf[len] = 0;
close(fd);
}
}
}; // namespace qService
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