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401 lines
14 KiB
401 lines
14 KiB
/*
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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 <inttypes.h>
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#include <unistd.h>
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#include <android/os/BnServiceCallback.h>
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#include <android/os/IServiceManager.h>
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#include <binder/IPCThreadState.h>
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#include <binder/Parcel.h>
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#include <utils/Log.h>
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#include <utils/String8.h>
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#include <utils/SystemClock.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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#ifdef __ANDROID__
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#include <cutils/properties.h>
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#endif
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#include "Static.h"
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namespace android {
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using AidlServiceManager = android::os::IServiceManager;
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using android::binder::Status;
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// libbinder's IServiceManager.h can't rely on the values generated by AIDL
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// because many places use its headers via include_dirs (meaning, without
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// declaring the dependency in the build system). So, for now, we can just check
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// the values here.
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static_assert(AidlServiceManager::DUMP_FLAG_PRIORITY_CRITICAL == IServiceManager::DUMP_FLAG_PRIORITY_CRITICAL);
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static_assert(AidlServiceManager::DUMP_FLAG_PRIORITY_HIGH == IServiceManager::DUMP_FLAG_PRIORITY_HIGH);
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static_assert(AidlServiceManager::DUMP_FLAG_PRIORITY_NORMAL == IServiceManager::DUMP_FLAG_PRIORITY_NORMAL);
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static_assert(AidlServiceManager::DUMP_FLAG_PRIORITY_DEFAULT == IServiceManager::DUMP_FLAG_PRIORITY_DEFAULT);
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static_assert(AidlServiceManager::DUMP_FLAG_PRIORITY_ALL == IServiceManager::DUMP_FLAG_PRIORITY_ALL);
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static_assert(AidlServiceManager::DUMP_FLAG_PROTO == IServiceManager::DUMP_FLAG_PROTO);
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const String16& IServiceManager::getInterfaceDescriptor() const {
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return AidlServiceManager::descriptor;
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}
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IServiceManager::IServiceManager() {}
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IServiceManager::~IServiceManager() {}
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// From the old libbinder IServiceManager interface to IServiceManager.
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class ServiceManagerShim : public IServiceManager
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{
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public:
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explicit ServiceManagerShim (const sp<AidlServiceManager>& impl);
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sp<IBinder> getService(const String16& name) const override;
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sp<IBinder> checkService(const String16& name) const override;
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status_t addService(const String16& name, const sp<IBinder>& service,
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bool allowIsolated, int dumpsysPriority) override;
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Vector<String16> listServices(int dumpsysPriority) override;
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sp<IBinder> waitForService(const String16& name16) override;
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bool isDeclared(const String16& name) override;
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Vector<String16> getDeclaredInstances(const String16& interface) override;
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std::optional<String16> updatableViaApex(const String16& name) override;
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// for legacy ABI
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const String16& getInterfaceDescriptor() const override {
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return mTheRealServiceManager->getInterfaceDescriptor();
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}
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IBinder* onAsBinder() override {
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return IInterface::asBinder(mTheRealServiceManager).get();
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}
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private:
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sp<AidlServiceManager> mTheRealServiceManager;
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};
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[[clang::no_destroy]] static std::once_flag gSmOnce;
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[[clang::no_destroy]] static sp<IServiceManager> gDefaultServiceManager;
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sp<IServiceManager> defaultServiceManager()
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{
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std::call_once(gSmOnce, []() {
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sp<AidlServiceManager> sm = nullptr;
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while (sm == nullptr) {
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sm = interface_cast<AidlServiceManager>(ProcessState::self()->getContextObject(nullptr));
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if (sm == nullptr) {
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ALOGE("Waiting 1s on context object on %s.", ProcessState::self()->getDriverName().c_str());
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sleep(1);
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}
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}
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gDefaultServiceManager = sp<ServiceManagerShim>::make(sm);
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});
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return gDefaultServiceManager;
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}
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void setDefaultServiceManager(const sp<IServiceManager>& sm) {
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bool called = false;
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std::call_once(gSmOnce, [&]() {
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gDefaultServiceManager = sm;
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called = true;
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});
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if (!called) {
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LOG_ALWAYS_FATAL("setDefaultServiceManager() called after defaultServiceManager().");
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}
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}
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#if !defined(__ANDROID_VNDK__) && defined(__ANDROID__)
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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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static Mutex gPermissionControllerLock;
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static sp<IPermissionController> gPermissionController;
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sp<IPermissionController> pc;
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gPermissionControllerLock.lock();
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pc = gPermissionController;
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gPermissionControllerLock.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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gPermissionControllerLock.lock();
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if (gPermissionController == pc) {
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gPermissionController = nullptr;
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}
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gPermissionControllerLock.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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gPermissionControllerLock.lock();
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gPermissionController = pc;
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gPermissionControllerLock.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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ServiceManagerShim::ServiceManagerShim(const sp<AidlServiceManager>& impl)
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: mTheRealServiceManager(impl)
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{}
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// This implementation could be simplified and made more efficient by delegating
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// to waitForService. However, this changes the threading structure in some
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// cases and could potentially break prebuilts. Once we have higher logistical
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// complexity, this could be attempted.
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sp<IBinder> ServiceManagerShim::getService(const String16& name) const
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{
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static bool gSystemBootCompleted = false;
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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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constexpr int64_t timeout = 5000;
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int64_t startTime = uptimeMillis();
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// Vendor code can't access system properties
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if (!gSystemBootCompleted && !isVendorService) {
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#ifdef __ANDROID__
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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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#else
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gSystemBootCompleted = true;
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#endif
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}
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// retry interval in millisecond; note that vendor services stay at 100ms
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const useconds_t sleepTime = gSystemBootCompleted ? 1000 : 100;
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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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int n = 0;
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while (uptimeMillis() - startTime < timeout) {
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n++;
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usleep(1000*sleepTime);
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sp<IBinder> svc = checkService(name);
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if (svc != nullptr) {
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ALOGI("Waiting for service '%s' on '%s' successful after waiting %" PRIi64 "ms",
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String8(name).string(), ProcessState::self()->getDriverName().c_str(),
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uptimeMillis() - startTime);
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return svc;
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}
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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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sp<IBinder> ServiceManagerShim::checkService(const String16& name) const
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{
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sp<IBinder> ret;
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if (!mTheRealServiceManager->checkService(String8(name).c_str(), &ret).isOk()) {
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return nullptr;
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}
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return ret;
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}
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status_t ServiceManagerShim::addService(const String16& name, const sp<IBinder>& service,
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bool allowIsolated, int dumpsysPriority)
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{
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Status status = mTheRealServiceManager->addService(
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String8(name).c_str(), service, allowIsolated, dumpsysPriority);
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return status.exceptionCode();
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}
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Vector<String16> ServiceManagerShim::listServices(int dumpsysPriority)
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{
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std::vector<std::string> ret;
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if (!mTheRealServiceManager->listServices(dumpsysPriority, &ret).isOk()) {
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return {};
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}
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Vector<String16> res;
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res.setCapacity(ret.size());
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for (const std::string& name : ret) {
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res.push(String16(name.c_str()));
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}
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return res;
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}
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sp<IBinder> ServiceManagerShim::waitForService(const String16& name16)
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{
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class Waiter : public android::os::BnServiceCallback {
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Status onRegistration(const std::string& /*name*/,
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const sp<IBinder>& binder) override {
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std::unique_lock<std::mutex> lock(mMutex);
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mBinder = binder;
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lock.unlock();
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// Flushing here helps ensure the service's ref count remains accurate
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IPCThreadState::self()->flushCommands();
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mCv.notify_one();
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return Status::ok();
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}
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public:
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sp<IBinder> mBinder;
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std::mutex mMutex;
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std::condition_variable mCv;
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};
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// Simple RAII object to ensure a function call immediately before going out of scope
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class Defer {
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public:
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explicit Defer(std::function<void()>&& f) : mF(std::move(f)) {}
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~Defer() { mF(); }
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private:
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std::function<void()> mF;
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};
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const std::string name = String8(name16).c_str();
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sp<IBinder> out;
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if (!mTheRealServiceManager->getService(name, &out).isOk()) {
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return nullptr;
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}
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if (out != nullptr) return out;
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sp<Waiter> waiter = sp<Waiter>::make();
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if (!mTheRealServiceManager->registerForNotifications(
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name, waiter).isOk()) {
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return nullptr;
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}
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Defer unregister ([&] {
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mTheRealServiceManager->unregisterForNotifications(name, waiter);
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});
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while(true) {
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{
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// It would be really nice if we could read binder commands on this
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// thread instead of needing a threadpool to be started, but for
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// instance, if we call getAndExecuteCommand, it might be the case
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// that another thread serves the callback, and we never get a
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// command, so we hang indefinitely.
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std::unique_lock<std::mutex> lock(waiter->mMutex);
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using std::literals::chrono_literals::operator""s;
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waiter->mCv.wait_for(lock, 1s, [&] {
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return waiter->mBinder != nullptr;
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});
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if (waiter->mBinder != nullptr) return waiter->mBinder;
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}
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ALOGW("Waited one second for %s (is service started? are binder threads started and available?)", name.c_str());
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// Handle race condition for lazy services. Here is what can happen:
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// - the service dies (not processed by init yet).
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// - sm processes death notification.
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// - sm gets getService and calls init to start service.
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// - init gets the start signal, but the service already appears
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// started, so it does nothing.
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// - init gets death signal, but doesn't know it needs to restart
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// the service
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// - we need to request service again to get it to start
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if (!mTheRealServiceManager->getService(name, &out).isOk()) {
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return nullptr;
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}
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if (out != nullptr) return out;
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}
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}
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bool ServiceManagerShim::isDeclared(const String16& name) {
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bool declared;
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if (!mTheRealServiceManager->isDeclared(String8(name).c_str(), &declared).isOk()) {
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return false;
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}
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return declared;
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}
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Vector<String16> ServiceManagerShim::getDeclaredInstances(const String16& interface) {
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std::vector<std::string> out;
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if (!mTheRealServiceManager->getDeclaredInstances(String8(interface).c_str(), &out).isOk()) {
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return {};
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}
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Vector<String16> res;
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res.setCapacity(out.size());
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for (const std::string& instance : out) {
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res.push(String16(instance.c_str()));
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}
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return res;
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}
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std::optional<String16> ServiceManagerShim::updatableViaApex(const String16& name) {
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std::optional<std::string> declared;
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if (!mTheRealServiceManager->updatableViaApex(String8(name).c_str(), &declared).isOk()) {
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return std::nullopt;
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}
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return declared ? std::optional<String16>(String16(declared.value().c_str())) : std::nullopt;
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}
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} // namespace android
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