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arc_session_impl.cc
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// Copyright 2017 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/arc/arc_session_impl.h"
#include <fcntl.h>
#include <poll.h>
#include <unistd.h>
#include <utility>
#include <vector>
#include "base/command_line.h"
#include "base/location.h"
#include "base/posix/eintr_wrapper.h"
#include "base/task_scheduler/post_task.h"
#include "base/task_scheduler/task_traits.h"
#include "chromeos/chromeos_switches.h"
#include "chromeos/cryptohome/cryptohome_parameters.h"
#include "chromeos/dbus/dbus_method_call_status.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/dbus/login_manager/arc.pb.h"
#include "components/arc/arc_bridge_host_impl.h"
#include "components/arc/arc_features.h"
#include "components/user_manager/user_manager.h"
#include "mojo/edk/embedder/embedder.h"
#include "mojo/edk/embedder/named_platform_handle.h"
#include "mojo/edk/embedder/named_platform_handle_utils.h"
#include "mojo/edk/embedder/outgoing_broker_client_invitation.h"
#include "mojo/edk/embedder/platform_channel_pair.h"
#include "mojo/edk/embedder/platform_channel_utils_posix.h"
#include "mojo/edk/embedder/scoped_platform_handle.h"
#include "mojo/public/cpp/bindings/binding.h"
namespace arc {
namespace {
using StartArcInstanceResult =
chromeos::SessionManagerClient::StartArcInstanceResult;
chromeos::SessionManagerClient* GetSessionManagerClient() {
// If the DBusThreadManager or the SessionManagerClient aren't available,
// there isn't much we can do. This should only happen when running tests.
if (!chromeos::DBusThreadManager::IsInitialized() ||
!chromeos::DBusThreadManager::Get() ||
!chromeos::DBusThreadManager::Get()->GetSessionManagerClient()) {
return nullptr;
}
return chromeos::DBusThreadManager::Get()->GetSessionManagerClient();
}
// Creates a pipe. Returns true on success, otherwise false.
// On success, |read_fd| will be set to the fd of the read side, and
// |write_fd| will be set to the one of write side.
bool CreatePipe(base::ScopedFD* read_fd, base::ScopedFD* write_fd) {
int fds[2];
if (pipe2(fds, O_NONBLOCK | O_CLOEXEC) < 0) {
PLOG(ERROR) << "pipe2()";
return false;
}
read_fd->reset(fds[0]);
write_fd->reset(fds[1]);
return true;
}
// Waits until |raw_socket_fd| is readable.
// The operation may be cancelled originally triggered by user interaction to
// disable ARC, or ARC instance is unexpectedly stopped (e.g. crash).
// To notify such a situation, |raw_cancel_fd| is also passed to here, and the
// write side will be closed in such a case.
bool WaitForSocketReadable(int raw_socket_fd, int raw_cancel_fd) {
struct pollfd fds[2] = {
{raw_socket_fd, POLLIN, 0}, {raw_cancel_fd, POLLIN, 0},
};
if (HANDLE_EINTR(poll(fds, arraysize(fds), -1)) <= 0) {
PLOG(ERROR) << "poll()";
return false;
}
if (fds[1].revents) {
// Notified that Stop() is invoked. Cancel the Mojo connecting.
VLOG(1) << "Stop() was called during ConnectMojo()";
return false;
}
DCHECK(fds[0].revents);
return true;
}
// Returns the ArcStopReason corresponding to the ARC instance staring failure.
ArcStopReason GetArcStopReason(StartArcInstanceResult result,
bool stop_requested) {
if (stop_requested)
return ArcStopReason::SHUTDOWN;
switch (result) {
case StartArcInstanceResult::SUCCESS:
NOTREACHED();
break;
case StartArcInstanceResult::UNKNOWN_ERROR:
return ArcStopReason::GENERIC_BOOT_FAILURE;
case StartArcInstanceResult::LOW_FREE_DISK_SPACE:
return ArcStopReason::LOW_DISK_SPACE;
}
NOTREACHED();
return ArcStopReason::GENERIC_BOOT_FAILURE;
}
// Real Delegate implementation to connect Mojo.
class ArcSessionDelegateImpl : public ArcSessionImpl::Delegate {
public:
explicit ArcSessionDelegateImpl(ArcBridgeService* arc_bridge_service);
~ArcSessionDelegateImpl() override = default;
// ArcSessionImpl::Delegate override.
base::ScopedFD ConnectMojo(base::ScopedFD socket_fd,
ConnectMojoCallback callback) override;
private:
// Synchronously accepts a connection on |socket_fd| and then processes the
// connected socket's file descriptor. This is designed to run on a
// blocking thread.
static mojo::ScopedMessagePipeHandle ConnectMojoInternal(
mojo::edk::ScopedPlatformHandle socket_fd,
base::ScopedFD cancel_fd);
// Called when Mojo connection is established or canceled.
// In case of cancel or error, |server_pipe| is invalid.
void OnMojoConnected(ConnectMojoCallback callback,
mojo::ScopedMessagePipeHandle server_pipe);
// Owned by ArcServiceManager.
ArcBridgeService* const arc_bridge_service_;
// WeakPtrFactory to use callbacks.
base::WeakPtrFactory<ArcSessionDelegateImpl> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(ArcSessionDelegateImpl);
};
ArcSessionDelegateImpl::ArcSessionDelegateImpl(
ArcBridgeService* arc_bridge_service)
: arc_bridge_service_(arc_bridge_service), weak_factory_(this) {}
base::ScopedFD ArcSessionDelegateImpl::ConnectMojo(
base::ScopedFD socket_fd,
ConnectMojoCallback callback) {
// Prepare a pipe so that AcceptInstanceConnection can be interrupted on
// Stop().
base::ScopedFD cancel_fd;
base::ScopedFD return_fd;
if (!CreatePipe(&cancel_fd, &return_fd)) {
LOG(ERROR) << "Failed to create a pipe to cancel accept()";
return base::ScopedFD();
}
// For production, |socket_fd| passed from session_manager is either a valid
// socket or a valid file descriptor (/dev/null). For testing, |socket_fd|
// might be invalid.
mojo::edk::PlatformHandle raw_handle(socket_fd.release());
raw_handle.needs_connection = true;
mojo::edk::ScopedPlatformHandle mojo_socket_fd(raw_handle);
base::PostTaskWithTraitsAndReplyWithResult(
FROM_HERE, {base::MayBlock()},
base::BindOnce(&ArcSessionDelegateImpl::ConnectMojoInternal,
std::move(mojo_socket_fd), std::move(cancel_fd)),
base::BindOnce(&ArcSessionDelegateImpl::OnMojoConnected,
weak_factory_.GetWeakPtr(), std::move(callback)));
return return_fd;
}
// static
mojo::ScopedMessagePipeHandle ArcSessionDelegateImpl::ConnectMojoInternal(
mojo::edk::ScopedPlatformHandle socket_fd,
base::ScopedFD cancel_fd) {
if (!WaitForSocketReadable(socket_fd.get().handle, cancel_fd.get())) {
VLOG(1) << "Mojo connection was cancelled.";
return mojo::ScopedMessagePipeHandle();
}
mojo::edk::ScopedPlatformHandle scoped_fd;
if (!mojo::edk::ServerAcceptConnection(socket_fd, &scoped_fd,
/* check_peer_user = */ false) ||
!scoped_fd.is_valid()) {
return mojo::ScopedMessagePipeHandle();
}
// Hardcode pid 0 since it is unused in mojo.
const base::ProcessHandle kUnusedChildProcessHandle = 0;
mojo::edk::PlatformChannelPair channel_pair;
mojo::edk::OutgoingBrokerClientInvitation invitation;
std::string token = mojo::edk::GenerateRandomToken();
mojo::ScopedMessagePipeHandle pipe = invitation.AttachMessagePipe(token);
invitation.Send(
kUnusedChildProcessHandle,
mojo::edk::ConnectionParams(mojo::edk::TransportProtocol::kLegacy,
channel_pair.PassServerHandle()));
std::vector<mojo::edk::ScopedPlatformHandle> handles;
handles.emplace_back(channel_pair.PassClientHandle());
// We need to send the length of the message as a single byte, so make sure it
// fits.
DCHECK_LT(token.size(), 256u);
uint8_t message_length = static_cast<uint8_t>(token.size());
struct iovec iov[] = {{&message_length, sizeof(message_length)},
{const_cast<char*>(token.c_str()), token.size()}};
ssize_t result = mojo::edk::PlatformChannelSendmsgWithHandles(
scoped_fd, iov, sizeof(iov) / sizeof(iov[0]), handles);
if (result == -1) {
PLOG(ERROR) << "sendmsg";
return mojo::ScopedMessagePipeHandle();
}
return pipe;
}
void ArcSessionDelegateImpl::OnMojoConnected(
ConnectMojoCallback callback,
mojo::ScopedMessagePipeHandle server_pipe) {
if (!server_pipe.is_valid()) {
LOG(ERROR) << "Invalid pipe";
std::move(callback).Run(nullptr);
return;
}
mojom::ArcBridgeInstancePtr instance;
instance.Bind(mojo::InterfacePtrInfo<mojom::ArcBridgeInstance>(
std::move(server_pipe), 0u));
std::move(callback).Run(std::make_unique<ArcBridgeHostImpl>(
arc_bridge_service_, std::move(instance)));
}
} // namespace
const char ArcSessionImpl::kPackagesCacheModeCopy[] = "copy";
const char ArcSessionImpl::kPackagesCacheModeSkipCopy[] = "skip-copy";
// static
std::unique_ptr<ArcSessionImpl::Delegate> ArcSessionImpl::CreateDelegate(
ArcBridgeService* arc_bridge_service) {
return std::make_unique<ArcSessionDelegateImpl>(arc_bridge_service);
}
ArcSessionImpl::ArcSessionImpl(std::unique_ptr<Delegate> delegate)
: delegate_(std::move(delegate)), weak_factory_(this) {
chromeos::SessionManagerClient* client = GetSessionManagerClient();
if (client == nullptr)
return;
client->AddObserver(this);
}
ArcSessionImpl::~ArcSessionImpl() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(state_ == State::NOT_STARTED || state_ == State::STOPPED);
chromeos::SessionManagerClient* client = GetSessionManagerClient();
if (client == nullptr)
return;
client->RemoveObserver(this);
}
void ArcSessionImpl::StartMiniInstance() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK_EQ(state_, State::NOT_STARTED);
state_ = State::STARTING_MINI_INSTANCE;
VLOG(2) << "Starting ARC mini instance";
login_manager::StartArcInstanceRequest request;
request.set_native_bridge_experiment(
base::FeatureList::IsEnabled(arc::kNativeBridgeExperimentFeature));
request.set_for_login_screen(true);
chromeos::SessionManagerClient* client = GetSessionManagerClient();
client->StartArcInstance(
request, base::BindOnce(&ArcSessionImpl::OnMiniInstanceStarted,
weak_factory_.GetWeakPtr()));
}
void ArcSessionImpl::RequestUpgrade() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
upgrade_requested_ = true;
switch (state_) {
case State::NOT_STARTED:
NOTREACHED();
break;
case State::STARTING_MINI_INSTANCE:
VLOG(2) << "Requested to upgrade a starting ARC mini instance";
// OnMiniInstanceStarted() will restart a full instance.
break;
case State::RUNNING_MINI_INSTANCE:
DoUpgrade();
break;
case State::STARTING_FULL_INSTANCE:
case State::CONNECTING_MOJO:
case State::RUNNING_FULL_INSTANCE:
case State::STOPPED:
// These mean RequestUpgrade() is called twice or called after
// stopped, which are invalid operations.
NOTREACHED();
break;
}
}
void ArcSessionImpl::OnMiniInstanceStarted(
chromeos::SessionManagerClient::StartArcInstanceResult result,
const std::string& container_instance_id,
base::ScopedFD socket_fd) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK_EQ(state_, State::STARTING_MINI_INSTANCE);
if (result != StartArcInstanceResult::SUCCESS) {
LOG(ERROR) << "Failed to start ARC instance";
OnStopped(GetArcStopReason(result, stop_requested_));
return;
}
DCHECK(!container_instance_id.empty());
container_instance_id_ = container_instance_id;
VLOG(2) << "ARC mini instance is successfully started: "
<< container_instance_id_;
if (stop_requested_) {
// The ARC instance has started to run. Request to stop.
StopArcInstance();
return;
}
state_ = State::RUNNING_MINI_INSTANCE;
if (upgrade_requested_)
// RequestUpgrade() has been called during the D-Bus call.
DoUpgrade();
}
void ArcSessionImpl::DoUpgrade() {
DCHECK_EQ(state_, State::RUNNING_MINI_INSTANCE);
VLOG(2) << "Upgrading an existing ARC mini instance";
state_ = State::STARTING_FULL_INSTANCE;
login_manager::StartArcInstanceRequest request;
request.set_native_bridge_experiment(
base::FeatureList::IsEnabled(arc::kNativeBridgeExperimentFeature));
user_manager::UserManager* user_manager = user_manager::UserManager::Get();
DCHECK(user_manager->GetPrimaryUser());
request.set_account_id(
cryptohome::Identification(user_manager->GetPrimaryUser()->GetAccountId())
.id());
request.set_skip_boot_completed_broadcast(
!base::FeatureList::IsEnabled(arc::kBootCompletedBroadcastFeature));
// We only enable /vendor/priv-app when voice interaction is enabled
// because voice interaction service apk would be bundled in this
// location.
request.set_scan_vendor_priv_app(
chromeos::switches::IsVoiceInteractionEnabled());
// Set packages cache mode coming from autotests.
const std::string packages_cache_mode_string =
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
chromeos::switches::kArcPackagesCacheMode);
if (packages_cache_mode_string == kPackagesCacheModeSkipCopy) {
request.set_packages_cache_mode(
login_manager::
StartArcInstanceRequest_PackageCacheMode_SKIP_SETUP_COPY_ON_INIT);
} else if (packages_cache_mode_string == kPackagesCacheModeCopy) {
request.set_packages_cache_mode(
login_manager::StartArcInstanceRequest_PackageCacheMode_COPY_ON_INIT);
} else if (!packages_cache_mode_string.empty()) {
VLOG(2) << "Invalid packages cache mode switch "
<< packages_cache_mode_string << ".";
}
chromeos::SessionManagerClient* client = GetSessionManagerClient();
client->StartArcInstance(request, base::BindOnce(&ArcSessionImpl::OnUpgraded,
weak_factory_.GetWeakPtr()));
}
void ArcSessionImpl::OnUpgraded(
chromeos::SessionManagerClient::StartArcInstanceResult result,
const std::string& container_instance_id, // unused
base::ScopedFD socket_fd) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK_EQ(state_, State::STARTING_FULL_INSTANCE);
if (result != StartArcInstanceResult::SUCCESS) {
LOG(ERROR) << "Failed to start ARC instance";
OnStopped(GetArcStopReason(result, stop_requested_));
return;
}
VLOG(2) << "ARC instance is successfully upgraded.";
if (stop_requested_) {
// The ARC instance has started to run. Request to stop.
StopArcInstance();
return;
}
VLOG(2) << "Connecting mojo...";
state_ = State::CONNECTING_MOJO;
accept_cancel_pipe_ = delegate_->ConnectMojo(
std::move(socket_fd), base::BindOnce(&ArcSessionImpl::OnMojoConnected,
weak_factory_.GetWeakPtr()));
if (!accept_cancel_pipe_.is_valid()) {
// Failed to post a task to accept() the request.
StopArcInstance();
return;
}
}
void ArcSessionImpl::OnMojoConnected(
std::unique_ptr<mojom::ArcBridgeHost> arc_bridge_host) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK_EQ(state_, State::CONNECTING_MOJO);
accept_cancel_pipe_.reset();
if (stop_requested_) {
StopArcInstance();
return;
}
if (!arc_bridge_host.get()) {
LOG(ERROR) << "Invalid pipe.";
StopArcInstance();
return;
}
arc_bridge_host_ = std::move(arc_bridge_host);
VLOG(0) << "ARC ready.";
state_ = State::RUNNING_FULL_INSTANCE;
}
void ArcSessionImpl::Stop() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
VLOG(2) << "Stopping ARC session is requested.";
// For second time or later, just do nothing.
// It is already in the stopping phase.
if (stop_requested_)
return;
stop_requested_ = true;
arc_bridge_host_.reset();
switch (state_) {
case State::NOT_STARTED:
OnStopped(ArcStopReason::SHUTDOWN);
return;
case State::STARTING_MINI_INSTANCE:
case State::STARTING_FULL_INSTANCE:
// Before starting the ARC instance, we do nothing here.
// At some point, a callback will be invoked on UI thread,
// and stopping procedure will be run there.
// On Chrome shutdown, it is not the case because the message loop is
// already stopped here. Practically, it is not a problem because;
// - On starting instance, the container instance can be leaked.
// Practically it is not problematic because the session manager will
// clean it up.
return;
case State::RUNNING_MINI_INSTANCE:
case State::RUNNING_FULL_INSTANCE:
// An ARC {mini,full} instance is running. Request to stop it.
StopArcInstance();
return;
case State::CONNECTING_MOJO:
// Mojo connection is being waited on TaskScheduler's thread.
// Request to cancel it. Following stopping procedure will run
// in its callback.
accept_cancel_pipe_.reset();
return;
case State::STOPPED:
// The instance is already stopped. Do nothing.
return;
}
}
void ArcSessionImpl::StopArcInstance() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(state_ == State::STARTING_MINI_INSTANCE ||
state_ == State::RUNNING_MINI_INSTANCE ||
state_ == State::STARTING_FULL_INSTANCE ||
state_ == State::CONNECTING_MOJO ||
state_ == State::RUNNING_FULL_INSTANCE);
VLOG(2) << "Requesting session_manager to stop ARC instance";
// When the instance is full instance, change the |state_| in
// ArcInstanceStopped().
chromeos::SessionManagerClient* client = GetSessionManagerClient();
// Since we have the ArcInstanceStopped() callback, we don't need to do
// anything when StopArcInstance completes.
client->StopArcInstance(chromeos::EmptyVoidDBusMethodCallback());
}
void ArcSessionImpl::ArcInstanceStopped(
bool clean,
const std::string& container_instance_id) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
VLOG(1) << "Notified that ARC instance is stopped "
<< (clean ? "cleanly" : "uncleanly");
if (container_instance_id != container_instance_id_) {
VLOG(1) << "Container instance id mismatch. Do nothing."
<< container_instance_id << " vs " << container_instance_id_;
return;
}
// Release |container_instance_id_| to avoid duplicate invocation situation.
container_instance_id_.clear();
// In case that crash happens during before the Mojo channel is connected,
// unlock the TaskScheduler's thread.
accept_cancel_pipe_.reset();
ArcStopReason reason;
if (stop_requested_) {
// If the ARC instance is stopped after its explicit request,
// return SHUTDOWN.
reason = ArcStopReason::SHUTDOWN;
} else if (clean) {
// If the ARC instance is stopped, but it is not explicitly requested,
// then this is triggered by some failure during the starting procedure.
// Return GENERIC_BOOT_FAILURE for the case.
reason = ArcStopReason::GENERIC_BOOT_FAILURE;
} else {
// Otherwise, this is caused by CRASH occured inside of the ARC instance.
reason = ArcStopReason::CRASH;
}
OnStopped(reason);
}
bool ArcSessionImpl::IsStopRequested() {
return stop_requested_;
}
void ArcSessionImpl::OnStopped(ArcStopReason reason) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
// OnStopped() should be called once per instance.
DCHECK_NE(state_, State::STOPPED);
VLOG(2) << "ARC session is stopped.";
const bool was_running = (state_ == State::RUNNING_FULL_INSTANCE);
arc_bridge_host_.reset();
state_ = State::STOPPED;
for (auto& observer : observer_list_)
observer.OnSessionStopped(reason, was_running, upgrade_requested_);
}
void ArcSessionImpl::OnShutdown() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
stop_requested_ = true;
if (state_ == State::STOPPED)
return;
// Here, the message loop is already stopped, and the Chrome will be soon
// shutdown. Thus, it is not necessary to take care about restarting case.
// If ArcSession is waiting for mojo connection, cancels it.
accept_cancel_pipe_.reset();
// Stops the ARC instance to let it graceful shutdown.
// Note that this may fail if ARC container is not actually running, but
// ignore an error as described below.
if (state_ == State::STARTING_MINI_INSTANCE ||
state_ == State::RUNNING_MINI_INSTANCE ||
state_ == State::STARTING_FULL_INSTANCE ||
state_ == State::CONNECTING_MOJO ||
state_ == State::RUNNING_FULL_INSTANCE) {
StopArcInstance();
}
// Directly set to the STOPPED state by OnStopped(). Note that calling
// StopArcInstance() may not work well. At least, because the UI thread is
// already stopped here, ArcInstanceStopped() callback cannot be invoked.
OnStopped(ArcStopReason::SHUTDOWN);
}
std::ostream& operator<<(std::ostream& os, ArcSessionImpl::State state) {
#define MAP_STATE(name) \
case ArcSessionImpl::State::name: \
return os << #name
switch (state) {
MAP_STATE(NOT_STARTED);
MAP_STATE(STARTING_MINI_INSTANCE);
MAP_STATE(RUNNING_MINI_INSTANCE);
MAP_STATE(STARTING_FULL_INSTANCE);
MAP_STATE(CONNECTING_MOJO);
MAP_STATE(RUNNING_FULL_INSTANCE);
MAP_STATE(STOPPED);
}
#undef MAP_STATE
// Some compilers report an error even if all values of an enum-class are
// covered exhaustively in a switch statement.
NOTREACHED() << "Invalid value " << static_cast<int>(state);
return os;
}
} // namespace arc