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IServiceManager.cpp
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IServiceManager.cpp
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/*
* Copyright (C) 2005 The Android Open Source Project
*
* 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.
*/
#define LOG_TAG "ServiceManager"
#include <binder/IServiceManager.h>
#include <private/binder/Static.h>
#include <utils/Log.h>
#include <binder/IPCThreadState.h>
#ifndef __ANDROID_VNDK__
#include <binder/IPermissionController.h>
#endif
#include <binder/Parcel.h>
#include <cutils/properties.h>
#include <utils/String8.h>
#include <utils/SystemClock.h>
#include <private/binder/Static.h>
#include <unistd.h>
namespace android {
sp<IServiceManager> defaultServiceManager()
{
if (gDefaultServiceManager != nullptr) return gDefaultServiceManager;
{
AutoMutex _l(gDefaultServiceManagerLock);
while (gDefaultServiceManager == nullptr) {
gDefaultServiceManager = interface_cast<IServiceManager>(
ProcessState::self()->getContextObject(nullptr));
if (gDefaultServiceManager == nullptr)
sleep(1);
}
}
return gDefaultServiceManager;
}
#ifndef __ANDROID_VNDK__
// IPermissionController is not accessible to vendors
bool checkCallingPermission(const String16& permission)
{
return checkCallingPermission(permission, nullptr, nullptr);
}
static String16 _permission("permission");
bool checkCallingPermission(const String16& permission, int32_t* outPid, int32_t* outUid)
{
IPCThreadState* ipcState = IPCThreadState::self();
pid_t pid = ipcState->getCallingPid();
uid_t uid = ipcState->getCallingUid();
if (outPid) *outPid = pid;
if (outUid) *outUid = uid;
return checkPermission(permission, pid, uid);
}
bool checkPermission(const String16& permission, pid_t pid, uid_t uid)
{
sp<IPermissionController> pc;
gDefaultServiceManagerLock.lock();
pc = gPermissionController;
gDefaultServiceManagerLock.unlock();
int64_t startTime = 0;
while (true) {
if (pc != nullptr) {
bool res = pc->checkPermission(permission, pid, uid);
if (res) {
if (startTime != 0) {
ALOGI("Check passed after %d seconds for %s from uid=%d pid=%d",
(int)((uptimeMillis()-startTime)/1000),
String8(permission).string(), uid, pid);
}
return res;
}
// Is this a permission failure, or did the controller go away?
if (IInterface::asBinder(pc)->isBinderAlive()) {
ALOGW("Permission failure: %s from uid=%d pid=%d",
String8(permission).string(), uid, pid);
return false;
}
// Object is dead!
gDefaultServiceManagerLock.lock();
if (gPermissionController == pc) {
gPermissionController = nullptr;
}
gDefaultServiceManagerLock.unlock();
}
// Need to retrieve the permission controller.
sp<IBinder> binder = defaultServiceManager()->checkService(_permission);
if (binder == nullptr) {
// Wait for the permission controller to come back...
if (startTime == 0) {
startTime = uptimeMillis();
ALOGI("Waiting to check permission %s from uid=%d pid=%d",
String8(permission).string(), uid, pid);
}
sleep(1);
} else {
pc = interface_cast<IPermissionController>(binder);
// Install the new permission controller, and try again.
gDefaultServiceManagerLock.lock();
gPermissionController = pc;
gDefaultServiceManagerLock.unlock();
}
}
}
#endif //__ANDROID_VNDK__
// ----------------------------------------------------------------------
class BpServiceManager : public BpInterface<IServiceManager>
{
public:
explicit BpServiceManager(const sp<IBinder>& impl)
: BpInterface<IServiceManager>(impl)
{
}
virtual sp<IBinder> getService(const String16& name) const
{
sp<IBinder> svc = checkService(name);
if (svc != nullptr) return svc;
const bool isVendorService =
strcmp(ProcessState::self()->getDriverName().c_str(), "/dev/vndbinder") == 0;
const long timeout = uptimeMillis() + 5000;
if (!gSystemBootCompleted && !isVendorService) {
// Vendor code can't access system properties
//char bootCompleted[PROPERTY_VALUE_MAX];
//property_get("sys.boot_completed", bootCompleted, "0");
gSystemBootCompleted = false;//strcmp(bootCompleted, "1") == 0 ? true : false;
}
// retry interval in millisecond; note that vendor services stay at 100ms
const long sleepTime = gSystemBootCompleted ? 1000 : 100;
int n = 0;
while (uptimeMillis() < timeout) {
n++;
ALOGI("Waiting for service '%s' on '%s'...", String8(name).string(),
ProcessState::self()->getDriverName().c_str());
usleep(1000*sleepTime);
sp<IBinder> svc = checkService(name);
if (svc != nullptr) return svc;
}
ALOGW("Service %s didn't start. Returning NULL", String8(name).string());
return nullptr;
}
virtual sp<IBinder> checkService( const String16& name) const
{
Parcel data, reply;
data.writeInterfaceToken(IServiceManager::getInterfaceDescriptor());
data.writeString16(name);
remote()->transact(CHECK_SERVICE_TRANSACTION, data, &reply);
return reply.readStrongBinder();
}
virtual status_t addService(const String16& name, const sp<IBinder>& service,
bool allowIsolated, int dumpsysPriority) {
Parcel data, reply;
data.writeInterfaceToken(IServiceManager::getInterfaceDescriptor());
data.writeString16(name);
data.writeStrongBinder(service);
data.writeInt32(allowIsolated ? 1 : 0);
data.writeInt32(dumpsysPriority);
status_t err = remote()->transact(ADD_SERVICE_TRANSACTION, data, &reply);
return err == NO_ERROR ? reply.readExceptionCode() : err;
}
virtual Vector<String16> listServices(int dumpsysPriority) {
Vector<String16> res;
int n = 0;
for (;;) {
Parcel data, reply;
data.writeInterfaceToken(IServiceManager::getInterfaceDescriptor());
data.writeInt32(n++);
data.writeInt32(dumpsysPriority);
status_t err = remote()->transact(LIST_SERVICES_TRANSACTION, data, &reply);
if (err != NO_ERROR)
break;
res.add(reply.readString16());
}
return res;
}
};
IMPLEMENT_META_INTERFACE(ServiceManager, "android.os.IServiceManager");
}; // namespace android