| /* |
| * 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 <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 = 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 |