/*
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* Copyright (C) 2005 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "ServiceManager"
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#include <binder/IServiceManager.h>
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#include <utils/Log.h>
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#include <binder/IPCThreadState.h>
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#ifndef __ANDROID_VNDK__
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#include <binder/IPermissionController.h>
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#endif
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#include <binder/Parcel.h>
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#include <cutils/properties.h>
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#include <utils/String8.h>
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#include <utils/SystemClock.h>
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#include <private/binder/Static.h>
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#include <unistd.h>
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namespace android {
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sp<IServiceManager> defaultServiceManager()
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{
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if (gDefaultServiceManager != nullptr) return gDefaultServiceManager;
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{
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AutoMutex _l(gDefaultServiceManagerLock);
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while (gDefaultServiceManager == nullptr) {
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gDefaultServiceManager = interface_cast<IServiceManager>(
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ProcessState::self()->getContextObject(nullptr));
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if (gDefaultServiceManager == nullptr)
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sleep(1);
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}
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}
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return gDefaultServiceManager;
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}
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#ifndef __ANDROID_VNDK__
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// IPermissionController is not accessible to vendors
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bool checkCallingPermission(const String16& permission)
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{
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return checkCallingPermission(permission, nullptr, nullptr);
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}
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static String16 _permission("permission");
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bool checkCallingPermission(const String16& permission, int32_t* outPid, int32_t* outUid)
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{
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IPCThreadState* ipcState = IPCThreadState::self();
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pid_t pid = ipcState->getCallingPid();
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uid_t uid = ipcState->getCallingUid();
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if (outPid) *outPid = pid;
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if (outUid) *outUid = uid;
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return checkPermission(permission, pid, uid);
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}
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bool checkPermission(const String16& permission, pid_t pid, uid_t uid)
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{
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sp<IPermissionController> pc;
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gDefaultServiceManagerLock.lock();
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pc = gPermissionController;
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gDefaultServiceManagerLock.unlock();
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int64_t startTime = 0;
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while (true) {
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if (pc != nullptr) {
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bool res = pc->checkPermission(permission, pid, uid);
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if (res) {
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if (startTime != 0) {
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ALOGI("Check passed after %d seconds for %s from uid=%d pid=%d",
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(int)((uptimeMillis()-startTime)/1000),
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String8(permission).string(), uid, pid);
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}
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return res;
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}
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// Is this a permission failure, or did the controller go away?
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if (IInterface::asBinder(pc)->isBinderAlive()) {
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ALOGW("Permission failure: %s from uid=%d pid=%d",
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String8(permission).string(), uid, pid);
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return false;
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}
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// Object is dead!
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gDefaultServiceManagerLock.lock();
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if (gPermissionController == pc) {
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gPermissionController = nullptr;
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}
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gDefaultServiceManagerLock.unlock();
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}
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// Need to retrieve the permission controller.
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sp<IBinder> binder = defaultServiceManager()->checkService(_permission);
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if (binder == nullptr) {
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// Wait for the permission controller to come back...
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if (startTime == 0) {
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startTime = uptimeMillis();
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ALOGI("Waiting to check permission %s from uid=%d pid=%d",
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String8(permission).string(), uid, pid);
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}
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sleep(1);
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} else {
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pc = interface_cast<IPermissionController>(binder);
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// Install the new permission controller, and try again.
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gDefaultServiceManagerLock.lock();
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gPermissionController = pc;
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gDefaultServiceManagerLock.unlock();
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}
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}
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}
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#endif //__ANDROID_VNDK__
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// ----------------------------------------------------------------------
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class BpServiceManager : public BpInterface<IServiceManager>
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{
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public:
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explicit BpServiceManager(const sp<IBinder>& impl)
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: BpInterface<IServiceManager>(impl)
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{
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}
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virtual sp<IBinder> getService(const String16& name) const
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{
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sp<IBinder> svc = checkService(name);
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if (svc != nullptr) return svc;
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const bool isVendorService =
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strcmp(ProcessState::self()->getDriverName().c_str(), "/dev/vndbinder") == 0;
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const long timeout = uptimeMillis() + 5000;
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if (!gSystemBootCompleted && !isVendorService) {
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// Vendor code can't access system properties
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char bootCompleted[PROPERTY_VALUE_MAX];
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property_get("sys.boot_completed", bootCompleted, "0");
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gSystemBootCompleted = strcmp(bootCompleted, "1") == 0 ? true : false;
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}
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// retry interval in millisecond; note that vendor services stay at 100ms
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const long sleepTime = gSystemBootCompleted ? 1000 : 100;
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int n = 0;
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while (uptimeMillis() < timeout) {
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n++;
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ALOGI("Waiting for service '%s' on '%s'...", String8(name).string(),
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ProcessState::self()->getDriverName().c_str());
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usleep(1000*sleepTime);
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sp<IBinder> svc = checkService(name);
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if (svc != nullptr) return svc;
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}
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ALOGW("Service %s didn't start. Returning NULL", String8(name).string());
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return nullptr;
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}
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virtual sp<IBinder> checkService( const String16& name) const
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{
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Parcel data, reply;
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data.writeInterfaceToken(IServiceManager::getInterfaceDescriptor());
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data.writeString16(name);
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remote()->transact(CHECK_SERVICE_TRANSACTION, data, &reply);
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return reply.readStrongBinder();
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}
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virtual status_t addService(const String16& name, const sp<IBinder>& service,
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bool allowIsolated, int dumpsysPriority) {
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Parcel data, reply;
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data.writeInterfaceToken(IServiceManager::getInterfaceDescriptor());
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data.writeString16(name);
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data.writeStrongBinder(service);
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data.writeInt32(allowIsolated ? 1 : 0);
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data.writeInt32(dumpsysPriority);
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status_t err = remote()->transact(ADD_SERVICE_TRANSACTION, data, &reply);
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return err == NO_ERROR ? reply.readExceptionCode() : err;
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}
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virtual Vector<String16> listServices(int dumpsysPriority) {
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Vector<String16> res;
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int n = 0;
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for (;;) {
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Parcel data, reply;
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data.writeInterfaceToken(IServiceManager::getInterfaceDescriptor());
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data.writeInt32(n++);
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data.writeInt32(dumpsysPriority);
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status_t err = remote()->transact(LIST_SERVICES_TRANSACTION, data, &reply);
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if (err != NO_ERROR)
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break;
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res.add(reply.readString16());
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}
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return res;
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}
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};
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IMPLEMENT_META_INTERFACE(ServiceManager, "android.os.IServiceManager");
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}; // namespace android
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