// Copyright 2014 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "components/metrics/cloned_install_detector.h" #include #include #include "base/bind.h" #include "base/location.h" #include "base/metrics/histogram_macros.h" #include "base/metrics/metrics_hashes.h" #include "base/task/single_thread_task_runner.h" #include "base/task/task_runner_util.h" #include "base/task/thread_pool.h" #include "components/metrics/machine_id_provider.h" #include "components/metrics/metrics_pref_names.h" #include "components/prefs/pref_registry_simple.h" #include "components/prefs/pref_service.h" namespace metrics { namespace { uint32_t HashRawId(const std::string& value) { uint64_t hash = base::HashMetricName(value); // Only use 24 bits from the 64-bit hash. return hash & ((1 << 24) - 1); } // State of the generated machine id in relation to the previously stored value. // Note: UMA histogram enum - don't re-order or remove entries enum MachineIdState { ID_GENERATION_FAILED, ID_NO_STORED_VALUE, ID_CHANGED, ID_UNCHANGED, ID_ENUM_SIZE }; // Logs the state of generating a machine id and comparing it to a stored value. void LogMachineIdState(MachineIdState state) { UMA_HISTOGRAM_ENUMERATION("UMA.MachineIdState", state, ID_ENUM_SIZE); } } // namespace ClonedInstallDetector::ClonedInstallDetector() {} ClonedInstallDetector::~ClonedInstallDetector() { } void ClonedInstallDetector::CheckForClonedInstall(PrefService* local_state) { if (!MachineIdProvider::HasId()) return; base::ThreadPool::PostTaskAndReplyWithResult( FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT, base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN}, base::BindOnce(&MachineIdProvider::GetMachineId), base::BindOnce(&ClonedInstallDetector::SaveMachineId, weak_ptr_factory_.GetWeakPtr(), local_state)); } void ClonedInstallDetector::SaveMachineId(PrefService* local_state, const std::string& raw_id) { if (raw_id.empty()) { LogMachineIdState(ID_GENERATION_FAILED); local_state->ClearPref(prefs::kMetricsMachineId); return; } int hashed_id = HashRawId(raw_id); MachineIdState id_state = ID_NO_STORED_VALUE; if (local_state->HasPrefPath(prefs::kMetricsMachineId)) { if (local_state->GetInteger(prefs::kMetricsMachineId) != hashed_id) { id_state = ID_CHANGED; detected_this_session_ = true; local_state->SetBoolean(prefs::kMetricsResetIds, true); } else { id_state = ID_UNCHANGED; } } LogMachineIdState(id_state); local_state->SetInteger(prefs::kMetricsMachineId, hashed_id); } bool ClonedInstallDetector::ShouldResetClientIds(PrefService* local_state) { // The existence of the pref indicates that it has been set when we saved the // MachineId and thus we need to update the member variable for this session // and clear the pref for future runs. We shouldn't clear the pref multiple // times because it may have been cloned again. if (!should_reset_client_ids_ && local_state->HasPrefPath(prefs::kMetricsResetIds)) { should_reset_client_ids_ = local_state->GetBoolean(prefs::kMetricsResetIds); local_state->ClearPref(prefs::kMetricsResetIds); } return should_reset_client_ids_; } bool ClonedInstallDetector::ClonedInstallDetectedInCurrentSession() const { return detected_this_session_; } // static void ClonedInstallDetector::RegisterPrefs(PrefRegistrySimple* registry) { registry->RegisterBooleanPref(prefs::kMetricsResetIds, false); registry->RegisterIntegerPref(prefs::kMetricsMachineId, 0); registry->RegisterIntegerPref(prefs::kClonedResetCount, 0); registry->RegisterInt64Pref(prefs::kFirstClonedResetTimestamp, 0); registry->RegisterInt64Pref(prefs::kLastClonedResetTimestamp, 0); } ClonedInstallInfo ClonedInstallDetector::ReadClonedInstallInfo( PrefService* local_state) { return ClonedInstallInfo{ .last_reset_timestamp = local_state->GetInt64(prefs::kLastClonedResetTimestamp), .first_reset_timestamp = local_state->GetInt64(prefs::kFirstClonedResetTimestamp), .reset_count = local_state->GetInteger(prefs::kClonedResetCount)}; } void ClonedInstallDetector::ClearClonedInstallInfo(PrefService* local_state) { local_state->ClearPref(prefs::kClonedResetCount); local_state->ClearPref(prefs::kFirstClonedResetTimestamp); local_state->ClearPref(prefs::kLastClonedResetTimestamp); } void ClonedInstallDetector::RecordClonedInstallInfo(PrefService* local_state) { ClonedInstallInfo cloned = ReadClonedInstallInfo(local_state); // Make sure that at the first time of reset, the first_timestamp matches with // the last_timestamp. int64_t time = base::Time::Now().ToTimeT(); // Only set |prefs::kFirstClonedResetTimestamp| when the client needs to be // reset due to cloned install for the first time. if (cloned.reset_count == 0) { local_state->SetInt64(prefs::kFirstClonedResetTimestamp, time); } local_state->SetInt64(prefs::kLastClonedResetTimestamp, time); local_state->SetInteger(prefs::kClonedResetCount, cloned.reset_count + 1); } } // namespace metrics