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// Copyright (c) 2012 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 "chrome/browser/upgrade_detector_impl.h"
#include <string>
#include "base/bind.h"
#include "base/build_time.h"
#include "base/command_line.h"
#include "base/cpu.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/path_service.h"
#include "base/prefs/pref_service.h"
#include "base/process/launch.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/google/google_brand.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/chrome_version_info.h"
#include "chrome/common/pref_names.h"
#include "components/network_time/network_time_tracker.h"
#include "content/public/browser/browser_thread.h"
#if defined(OS_WIN)
#include "base/win/win_util.h"
#include "chrome/installer/util/browser_distribution.h"
#include "chrome/installer/util/google_update_settings.h"
#include "chrome/installer/util/helper.h"
#include "chrome/installer/util/install_util.h"
#elif defined(OS_MACOSX)
#include "chrome/browser/mac/keystone_glue.h"
#endif
using content::BrowserThread;
namespace {
// How long (in milliseconds) to wait (each cycle) before checking whether
// Chrome's been upgraded behind our back.
const int kCheckForUpgradeMs = 2 * 60 * 60 * 1000; // 2 hours.
// How long to wait (each cycle) before checking which severity level we should
// be at. Once we reach the highest severity, the timer will stop.
const int kNotifyCycleTimeMs = 20 * 60 * 1000; // 20 minutes.
// Same as kNotifyCycleTimeMs but only used during testing.
const int kNotifyCycleTimeForTestingMs = 500; // Half a second.
// The number of days after which we identify a build/install as outdated.
const uint64 kOutdatedBuildAgeInDays = 12 * 7;
// Return the string that was passed as a value for the
// kCheckForUpdateIntervalSec switch.
std::string CmdLineInterval() {
const CommandLine& cmd_line = *CommandLine::ForCurrentProcess();
return cmd_line.GetSwitchValueASCII(switches::kCheckForUpdateIntervalSec);
}
// Check if one of the outdated simulation switches was present on the command
// line.
bool SimulatingOutdated() {
const CommandLine& cmd_line = *CommandLine::ForCurrentProcess();
return cmd_line.HasSwitch(switches::kSimulateOutdated) ||
cmd_line.HasSwitch(switches::kSimulateOutdatedNoAU);
}
// Check if any of the testing switches was present on the command line.
bool IsTesting() {
const CommandLine& cmd_line = *CommandLine::ForCurrentProcess();
return cmd_line.HasSwitch(switches::kSimulateUpgrade) ||
cmd_line.HasSwitch(switches::kCheckForUpdateIntervalSec) ||
cmd_line.HasSwitch(switches::kSimulateCriticalUpdate) ||
SimulatingOutdated();
}
// How often to check for an upgrade.
int GetCheckForUpgradeEveryMs() {
// Check for a value passed via the command line.
int interval_ms;
std::string interval = CmdLineInterval();
if (!interval.empty() && base::StringToInt(interval, &interval_ms))
return interval_ms * 1000; // Command line value is in seconds.
return kCheckForUpgradeMs;
}
// Return true if the current build is one of the unstable channels.
bool IsUnstableChannel() {
// TODO(mad): Investigate whether we still need to be on the file thread for
// this. On Windows, the file thread used to be required for registry access
// but no anymore. But other platform may still need the file thread.
// crbug.com/366647.
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
return channel == chrome::VersionInfo::CHANNEL_DEV ||
channel == chrome::VersionInfo::CHANNEL_CANARY;
}
// This task identifies whether we are running an unstable version. And then it
// unconditionally calls back the provided task.
void CheckForUnstableChannel(const base::Closure& callback_task,
bool* is_unstable_channel) {
*is_unstable_channel = IsUnstableChannel();
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, callback_task);
}
#if defined(OS_WIN)
// Return true if the currently running Chrome is a system install.
bool IsSystemInstall() {
// Get the version of the currently *installed* instance of Chrome,
// which might be newer than the *running* instance if we have been
// upgraded in the background.
base::FilePath exe_path;
if (!PathService::Get(base::DIR_EXE, &exe_path)) {
NOTREACHED() << "Failed to find executable path";
return false;
}
return !InstallUtil::IsPerUserInstall(exe_path.value().c_str());
}
// Sets |is_unstable_channel| to true if the current chrome is on the dev or
// canary channels. Sets |is_auto_update_enabled| to true if Google Update will
// update the current chrome. Unconditionally posts |callback_task| to the UI
// thread to continue processing.
void DetectUpdatability(const base::Closure& callback_task,
bool* is_unstable_channel,
bool* is_auto_update_enabled) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
base::string16 app_guid = installer::GetAppGuidForUpdates(IsSystemInstall());
DCHECK(!app_guid.empty());
// Don't try to turn on autoupdate when we failed previously.
if (is_auto_update_enabled) {
*is_auto_update_enabled =
GoogleUpdateSettings::AreAutoupdatesEnabled(app_guid);
}
*is_unstable_channel = IsUnstableChannel();
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, callback_task);
}
#endif // defined(OS_WIN)
// Gets the currently installed version. On Windows, if |critical_update| is not
// NULL, also retrieves the critical update version info if available.
base::Version GetCurrentlyInstalledVersionImpl(Version* critical_update) {
base::ThreadRestrictions::AssertIOAllowed();
Version installed_version;
#if defined(OS_WIN)
// Get the version of the currently *installed* instance of Chrome,
// which might be newer than the *running* instance if we have been
// upgraded in the background.
bool system_install = IsSystemInstall();
// TODO(tommi): Check if using the default distribution is always the right
// thing to do.
BrowserDistribution* dist = BrowserDistribution::GetDistribution();
InstallUtil::GetChromeVersion(dist, system_install, &installed_version);
if (critical_update && installed_version.IsValid()) {
InstallUtil::GetCriticalUpdateVersion(dist, system_install,
critical_update);
}
#elif defined(OS_MACOSX)
installed_version =
Version(base::UTF16ToASCII(keystone_glue::CurrentlyInstalledVersion()));
#elif defined(OS_POSIX)
// POSIX but not Mac OS X: Linux, etc.
CommandLine command_line(*CommandLine::ForCurrentProcess());
command_line.AppendSwitch(switches::kProductVersion);
std::string reply;
if (!base::GetAppOutput(command_line, &reply)) {
DLOG(ERROR) << "Failed to get current file version";
return installed_version;
}
installed_version = Version(reply);
#endif
return installed_version;
}
} // namespace
UpgradeDetectorImpl::UpgradeDetectorImpl()
: weak_factory_(this),
is_unstable_channel_(false),
is_auto_update_enabled_(true),
build_date_(base::GetBuildTime()) {
CommandLine command_line(*CommandLine::ForCurrentProcess());
// The different command line switches that affect testing can't be used
// simultaneously, if they do, here's the precedence order, based on the order
// of the if statements below:
// - kDisableBackgroundNetworking prevents any of the other command line
// switch from being taken into account.
// - kSimulateUpgrade supersedes critical or outdated upgrade switches.
// - kSimulateCriticalUpdate has precedence over kSimulateOutdated.
// - kSimulateOutdatedNoAU has precedence over kSimulateOutdated.
// - kSimulateOutdated[NoAu] can work on its own, or with a specified date.
if (command_line.HasSwitch(switches::kDisableBackgroundNetworking))
return;
if (command_line.HasSwitch(switches::kSimulateUpgrade)) {
UpgradeDetected(UPGRADE_AVAILABLE_REGULAR);
return;
}
if (command_line.HasSwitch(switches::kSimulateCriticalUpdate)) {
UpgradeDetected(UPGRADE_AVAILABLE_CRITICAL);
return;
}
if (SimulatingOutdated()) {
// The outdated simulation can work without a value, which means outdated
// now, or with a value that must be a well formed date/time string that
// overrides the build date.
// Also note that to test with a given time/date, until the network time
// tracking moves off of the VariationsService, the "variations-server-url"
// command line switch must also be specified for the service to be
// available on non GOOGLE_CHROME_BUILD.
std::string switch_name;
if (command_line.HasSwitch(switches::kSimulateOutdatedNoAU)) {
is_auto_update_enabled_ = false;
switch_name = switches::kSimulateOutdatedNoAU;
} else {
switch_name = switches::kSimulateOutdated;
}
std::string build_date = command_line.GetSwitchValueASCII(switch_name);
base::Time maybe_build_time;
bool result = base::Time::FromString(build_date.c_str(), &maybe_build_time);
if (result && !maybe_build_time.is_null()) {
// We got a valid build date simulation so use it and check for upgrades.
build_date_ = maybe_build_time;
StartTimerForUpgradeCheck();
} else {
// Without a valid date, we simulate that we are already outdated...
UpgradeDetected(
is_auto_update_enabled_ ? UPGRADE_NEEDED_OUTDATED_INSTALL
: UPGRADE_NEEDED_OUTDATED_INSTALL_NO_AU);
}
return;
}
// Register for experiment notifications. Note that since this class is a
// singleton, it does not need to unregister for notifications when destroyed,
// since it outlives the VariationsService.
chrome_variations::VariationsService* variations_service =
g_browser_process->variations_service();
if (variations_service)
variations_service->AddObserver(this);
base::Closure start_upgrade_check_timer_task =
base::Bind(&UpgradeDetectorImpl::StartTimerForUpgradeCheck,
weak_factory_.GetWeakPtr());
#if defined(OS_WIN)
// Only enable upgrade notifications for official builds. Chromium has no
// upgrade channel.
#if defined(GOOGLE_CHROME_BUILD)
// On Windows, there might be a policy/enterprise environment preventing
// updates, so validate updatability, and then call StartTimerForUpgradeCheck
// appropriately. And don't check for autoupdate if we already attempted to
// enable it in the past.
bool attempted_enabling_autoupdate = g_browser_process->local_state() &&
g_browser_process->local_state()->GetBoolean(
prefs::kAttemptedToEnableAutoupdate);
BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
base::Bind(&DetectUpdatability,
start_upgrade_check_timer_task,
&is_unstable_channel_,
attempted_enabling_autoupdate ?
NULL : &is_auto_update_enabled_));
#endif
#else
#if defined(OS_MACOSX)
// Only enable upgrade notifications if the updater (Keystone) is present.
if (!keystone_glue::KeystoneEnabled()) {
is_auto_update_enabled_ = false;
return;
}
#elif defined(OS_POSIX)
// Always enable upgrade notifications regardless of branding.
#else
return;
#endif
// Check whether the build is an unstable channel before starting the timer.
BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
base::Bind(&CheckForUnstableChannel,
start_upgrade_check_timer_task,
&is_unstable_channel_));
#endif
}
UpgradeDetectorImpl::~UpgradeDetectorImpl() {
}
// static
base::Version UpgradeDetectorImpl::GetCurrentlyInstalledVersion() {
return GetCurrentlyInstalledVersionImpl(NULL);
}
// static
// This task checks the currently running version of Chrome against the
// installed version. If the installed version is newer, it calls back
// UpgradeDetectorImpl::UpgradeDetected using a weak pointer so that it can
// be interrupted from the UI thread.
void UpgradeDetectorImpl::DetectUpgradeTask(
base::WeakPtr<UpgradeDetectorImpl> upgrade_detector) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
Version critical_update;
Version installed_version =
GetCurrentlyInstalledVersionImpl(&critical_update);
// Get the version of the currently *running* instance of Chrome.
chrome::VersionInfo version_info;
if (!version_info.is_valid()) {
NOTREACHED() << "Failed to get current file version";
return;
}
Version running_version(version_info.Version());
if (!running_version.IsValid()) {
NOTREACHED();
return;
}
// |installed_version| may be NULL when the user downgrades on Linux (by
// switching from dev to beta channel, for example). The user needs a
// restart in this case as well. See http://crbug.com/46547
if (!installed_version.IsValid() ||
(installed_version.CompareTo(running_version) > 0)) {
// If a more recent version is available, it might be that we are lacking
// a critical update, such as a zero-day fix.
UpgradeAvailable upgrade_available = UPGRADE_AVAILABLE_REGULAR;
if (critical_update.IsValid() &&
critical_update.CompareTo(running_version) > 0) {
upgrade_available = UPGRADE_AVAILABLE_CRITICAL;
}
// Fire off the upgrade detected task.
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&UpgradeDetectorImpl::UpgradeDetected,
upgrade_detector,
upgrade_available));
}
}
void UpgradeDetectorImpl::StartTimerForUpgradeCheck() {
detect_upgrade_timer_.Start(FROM_HERE,
base::TimeDelta::FromMilliseconds(GetCheckForUpgradeEveryMs()),
this, &UpgradeDetectorImpl::CheckForUpgrade);
}
void UpgradeDetectorImpl::StartUpgradeNotificationTimer() {
// The timer may already be running (e.g. due to both a software upgrade and
// experiment updates being available).
if (upgrade_notification_timer_.IsRunning())
return;
upgrade_detected_time_ = base::Time::Now();
// Start the repeating timer for notifying the user after a certain period.
// The called function will eventually figure out that enough time has passed
// and stop the timer.
const int cycle_time_ms = IsTesting() ?
kNotifyCycleTimeForTestingMs : kNotifyCycleTimeMs;
upgrade_notification_timer_.Start(FROM_HERE,
base::TimeDelta::FromMilliseconds(cycle_time_ms),
this, &UpgradeDetectorImpl::NotifyOnUpgrade);
}
void UpgradeDetectorImpl::CheckForUpgrade() {
// Interrupt any (unlikely) unfinished execution of DetectUpgradeTask, or at
// least prevent the callback from being executed, because we will potentially
// call it from within DetectOutdatedInstall() or will post
// DetectUpgradeTask again below anyway.
weak_factory_.InvalidateWeakPtrs();
// No need to look for upgrades if the install is outdated.
if (DetectOutdatedInstall())
return;
// We use FILE as the thread to run the upgrade detection code on all
// platforms. For Linux, this is because we don't want to block the UI thread
// while launching a background process and reading its output; on the Mac and
// on Windows checking for an upgrade requires reading a file.
BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE,
base::Bind(&UpgradeDetectorImpl::DetectUpgradeTask,
weak_factory_.GetWeakPtr()));
}
bool UpgradeDetectorImpl::DetectOutdatedInstall() {
// Don't show the bubble if we have a brand code that is NOT organic, unless
// an outdated build is being simulated by command line switches.
static bool simulate_outdated = SimulatingOutdated();
if (!simulate_outdated) {
std::string brand;
if (google_brand::GetBrand(&brand) && !google_brand::IsOrganic(brand))
return false;
#if defined(OS_WIN)
// Don't show the update bubbles to enterprise users (i.e., on a domain).
if (base::win::IsEnrolledToDomain())
return false;
// On Windows, we don't want to warn about outdated installs when the
// machine doesn't support SSE2, it's been deprecated starting with M35.
if (!base::CPU().has_sse2())
return false;
#endif
}
base::Time network_time;
base::TimeDelta uncertainty;
if (!g_browser_process->network_time_tracker()->GetNetworkTime(
base::TimeTicks::Now(), &network_time, &uncertainty)) {
// When network time has not been initialized yet, simply rely on the
// machine's current time.
network_time = base::Time::Now();
}
if (network_time.is_null() || build_date_.is_null() ||
build_date_ > network_time) {
NOTREACHED();
return false;
}
if (network_time - build_date_ >
base::TimeDelta::FromDays(kOutdatedBuildAgeInDays)) {
UpgradeDetected(is_auto_update_enabled_ ?
UPGRADE_NEEDED_OUTDATED_INSTALL :
UPGRADE_NEEDED_OUTDATED_INSTALL_NO_AU);
return true;
}
// If we simlated an outdated install with a date, we don't want to keep
// checking for version upgrades, which happens on non-official builds.
return simulate_outdated;
}
void UpgradeDetectorImpl::OnExperimentChangesDetected(Severity severity) {
set_best_effort_experiment_updates_available(severity == BEST_EFFORT);
set_critical_experiment_updates_available(severity == CRITICAL);
StartUpgradeNotificationTimer();
}
void UpgradeDetectorImpl::UpgradeDetected(UpgradeAvailable upgrade_available) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
set_upgrade_available(upgrade_available);
// Stop the recurring timer (that is checking for changes).
detect_upgrade_timer_.Stop();
set_critical_update_acknowledged(false);
StartUpgradeNotificationTimer();
}
void UpgradeDetectorImpl::NotifyOnUpgradeWithTimePassed(
base::TimeDelta time_passed) {
const bool is_critical_or_outdated =
upgrade_available() > UPGRADE_AVAILABLE_REGULAR ||
critical_experiment_updates_available();
if (is_unstable_channel_) {
// There's only one threat level for unstable channels like dev and
// canary, and it hits after one hour. During testing, it hits after one
// second.
const base::TimeDelta unstable_threshold = IsTesting() ?
base::TimeDelta::FromSeconds(1) : base::TimeDelta::FromHours(1);
if (is_critical_or_outdated) {
set_upgrade_notification_stage(UPGRADE_ANNOYANCE_CRITICAL);
} else if (time_passed >= unstable_threshold) {
set_upgrade_notification_stage(UPGRADE_ANNOYANCE_LOW);
// That's as high as it goes.
upgrade_notification_timer_.Stop();
} else {
return; // Not ready to recommend upgrade.
}
} else {
const base::TimeDelta multiplier = IsTesting() ?
base::TimeDelta::FromSeconds(10) : base::TimeDelta::FromDays(1);
// 14 days when not testing, otherwise 140 seconds.
const base::TimeDelta severe_threshold = 14 * multiplier;
const base::TimeDelta high_threshold = 7 * multiplier;
const base::TimeDelta elevated_threshold = 4 * multiplier;
const base::TimeDelta low_threshold = 2 * multiplier;
// These if statements must be sorted (highest interval first).
if (time_passed >= severe_threshold || is_critical_or_outdated) {
set_upgrade_notification_stage(
is_critical_or_outdated ? UPGRADE_ANNOYANCE_CRITICAL :
UPGRADE_ANNOYANCE_SEVERE);
// We can't get any higher, baby.
upgrade_notification_timer_.Stop();
} else if (time_passed >= high_threshold) {
set_upgrade_notification_stage(UPGRADE_ANNOYANCE_HIGH);
} else if (time_passed >= elevated_threshold) {
set_upgrade_notification_stage(UPGRADE_ANNOYANCE_ELEVATED);
} else if (time_passed >= low_threshold) {
set_upgrade_notification_stage(UPGRADE_ANNOYANCE_LOW);
} else {
return; // Not ready to recommend upgrade.
}
}
NotifyUpgradeRecommended();
}
void UpgradeDetectorImpl::NotifyOnUpgrade() {
const base::TimeDelta time_passed =
base::Time::Now() - upgrade_detected_time_;
NotifyOnUpgradeWithTimePassed(time_passed);
}
// static
UpgradeDetectorImpl* UpgradeDetectorImpl::GetInstance() {
return Singleton<UpgradeDetectorImpl>::get();
}
// static
UpgradeDetector* UpgradeDetector::GetInstance() {
return UpgradeDetectorImpl::GetInstance();
}
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