blob: 4cc660627434707a98eed4932d764f1fad2a7557 [file] [log] [blame]
// 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 "remoting/host/chromoting_host.h"
#include <stddef.h>
#include <algorithm>
#include <utility>
#include "base/bind.h"
#include "base/callback.h"
#include "base/command_line.h"
#include "base/memory/ptr_util.h"
#include "base/single_thread_task_runner.h"
#include "build/build_config.h"
#include "jingle/glue/thread_wrapper.h"
#include "remoting/base/constants.h"
#include "remoting/base/logging.h"
#include "remoting/host/desktop_environment.h"
#include "remoting/host/host_config.h"
#include "remoting/host/input_injector.h"
#include "remoting/protocol/client_stub.h"
#include "remoting/protocol/host_stub.h"
#include "remoting/protocol/ice_connection_to_client.h"
#include "remoting/protocol/input_stub.h"
#include "remoting/protocol/transport_context.h"
#include "remoting/protocol/webrtc_connection_to_client.h"
using remoting::protocol::ConnectionToClient;
using remoting::protocol::InputStub;
namespace remoting {
namespace {
const net::BackoffEntry::Policy kDefaultBackoffPolicy = {
// Number of initial errors (in sequence) to ignore before applying
// exponential back-off rules.
0,
// Initial delay for exponential back-off in ms.
2000,
// Factor by which the waiting time will be multiplied.
2,
// Fuzzing percentage. ex: 10% will spread requests randomly
// between 90%-100% of the calculated time.
0,
// Maximum amount of time we are willing to delay our request in ms.
-1,
// Time to keep an entry from being discarded even when it
// has no significant state, -1 to never discard.
-1,
// Don't use initial delay unless the last request was an error.
false,
};
} // namespace
ChromotingHost::ChromotingHost(
DesktopEnvironmentFactory* desktop_environment_factory,
std::unique_ptr<protocol::SessionManager> session_manager,
scoped_refptr<protocol::TransportContext> transport_context,
scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> video_encode_task_runner)
: desktop_environment_factory_(desktop_environment_factory),
session_manager_(std::move(session_manager)),
transport_context_(transport_context),
audio_task_runner_(audio_task_runner),
video_encode_task_runner_(video_encode_task_runner),
started_(false),
login_backoff_(&kDefaultBackoffPolicy),
enable_curtaining_(false),
weak_factory_(this) {
jingle_glue::JingleThreadWrapper::EnsureForCurrentMessageLoop();
}
ChromotingHost::~ChromotingHost() {
DCHECK(CalledOnValidThread());
// Disconnect all of the clients.
while (!clients_.empty()) {
clients_.front()->DisconnectSession(protocol::OK);
}
// Destroy the session manager to make sure that |signal_strategy_| does not
// have any listeners registered.
session_manager_.reset();
// Notify observers.
if (started_)
FOR_EACH_OBSERVER(HostStatusObserver, status_observers_, OnShutdown());
}
void ChromotingHost::Start(const std::string& host_owner_email) {
DCHECK(CalledOnValidThread());
DCHECK(!started_);
HOST_LOG << "Starting host";
started_ = true;
FOR_EACH_OBSERVER(HostStatusObserver, status_observers_,
OnStart(host_owner_email));
session_manager_->AcceptIncoming(
base::Bind(&ChromotingHost::OnIncomingSession, base::Unretained(this)));
}
void ChromotingHost::AddStatusObserver(HostStatusObserver* observer) {
DCHECK(CalledOnValidThread());
status_observers_.AddObserver(observer);
}
void ChromotingHost::RemoveStatusObserver(HostStatusObserver* observer) {
DCHECK(CalledOnValidThread());
status_observers_.RemoveObserver(observer);
}
void ChromotingHost::AddExtension(std::unique_ptr<HostExtension> extension) {
extensions_.push_back(extension.release());
}
void ChromotingHost::SetAuthenticatorFactory(
std::unique_ptr<protocol::AuthenticatorFactory> authenticator_factory) {
DCHECK(CalledOnValidThread());
session_manager_->set_authenticator_factory(std::move(authenticator_factory));
}
void ChromotingHost::SetEnableCurtaining(bool enable) {
DCHECK(CalledOnValidThread());
if (enable_curtaining_ == enable)
return;
enable_curtaining_ = enable;
desktop_environment_factory_->SetEnableCurtaining(enable_curtaining_);
// Disconnect all existing clients because they might be running not
// curtained.
// TODO(alexeypa): fix this such that the curtain is applied to the not
// curtained sessions or disconnect only the client connected to not
// curtained sessions.
if (enable_curtaining_)
DisconnectAllClients();
}
void ChromotingHost::SetMaximumSessionDuration(
const base::TimeDelta& max_session_duration) {
max_session_duration_ = max_session_duration;
}
////////////////////////////////////////////////////////////////////////////
// protocol::ClientSession::EventHandler implementation.
void ChromotingHost::OnSessionAuthenticating(ClientSession* client) {
// We treat each incoming connection as a failure to authenticate,
// and clear the backoff when a connection successfully
// authenticates. This allows the backoff to protect from parallel
// connection attempts as well as sequential ones.
if (login_backoff_.ShouldRejectRequest()) {
LOG(WARNING) << "Disconnecting client " << client->client_jid() << " due to"
" an overload of failed login attempts.";
client->DisconnectSession(protocol::HOST_OVERLOAD);
return;
}
login_backoff_.InformOfRequest(false);
}
void ChromotingHost::OnSessionAuthenticated(ClientSession* client) {
DCHECK(CalledOnValidThread());
login_backoff_.Reset();
// Disconnect all other clients. |it| should be advanced before Disconnect()
// is called to avoid it becoming invalid when the client is removed from
// the list.
ClientList::iterator it = clients_.begin();
base::WeakPtr<ChromotingHost> self = weak_factory_.GetWeakPtr();
while (it != clients_.end()) {
ClientSession* other_client = *it++;
if (other_client != client) {
other_client->DisconnectSession(protocol::OK);
// Quit if the host was destroyed.
if (!self)
return;
}
}
// Disconnects above must have destroyed all other clients.
DCHECK_EQ(clients_.size(), 1U);
// Notify observers that there is at least one authenticated client.
const std::string& jid = client->client_jid();
FOR_EACH_OBSERVER(HostStatusObserver, status_observers_,
OnClientAuthenticated(jid));
}
void ChromotingHost::OnSessionChannelsConnected(ClientSession* client) {
DCHECK(CalledOnValidThread());
// Notify observers.
FOR_EACH_OBSERVER(HostStatusObserver, status_observers_,
OnClientConnected(client->client_jid()));
}
void ChromotingHost::OnSessionAuthenticationFailed(ClientSession* client) {
DCHECK(CalledOnValidThread());
// Notify observers.
FOR_EACH_OBSERVER(HostStatusObserver, status_observers_,
OnAccessDenied(client->client_jid()));
}
void ChromotingHost::OnSessionClosed(ClientSession* client) {
DCHECK(CalledOnValidThread());
ClientList::iterator it = std::find(clients_.begin(), clients_.end(), client);
CHECK(it != clients_.end());
bool was_authenticated = client->is_authenticated();
std::string jid = client->client_jid();
clients_.erase(it);
delete client;
if (was_authenticated) {
FOR_EACH_OBSERVER(HostStatusObserver, status_observers_,
OnClientDisconnected(jid));
}
}
void ChromotingHost::OnSessionRouteChange(
ClientSession* session,
const std::string& channel_name,
const protocol::TransportRoute& route) {
DCHECK(CalledOnValidThread());
FOR_EACH_OBSERVER(HostStatusObserver, status_observers_,
OnClientRouteChange(session->client_jid(), channel_name,
route));
}
void ChromotingHost::OnIncomingSession(
protocol::Session* session,
protocol::SessionManager::IncomingSessionResponse* response) {
DCHECK(CalledOnValidThread());
DCHECK(started_);
if (login_backoff_.ShouldRejectRequest()) {
LOG(WARNING) << "Rejecting connection due to"
" an overload of failed login attempts.";
*response = protocol::SessionManager::OVERLOAD;
return;
}
*response = protocol::SessionManager::ACCEPT;
HOST_LOG << "Client connected: " << session->jid();
// Create either IceConnectionToClient or WebrtcConnectionToClient.
// TODO(sergeyu): Move this logic to the protocol layer.
std::unique_ptr<protocol::ConnectionToClient> connection;
if (session->config().protocol() ==
protocol::SessionConfig::Protocol::WEBRTC) {
connection.reset(new protocol::WebrtcConnectionToClient(
base::WrapUnique(session), transport_context_,
video_encode_task_runner_));
} else {
connection.reset(new protocol::IceConnectionToClient(
base::WrapUnique(session), transport_context_,
video_encode_task_runner_));
}
// Create a ClientSession object.
ClientSession* client =
new ClientSession(this, audio_task_runner_, std::move(connection),
desktop_environment_factory_, max_session_duration_,
pairing_registry_, extensions_.get());
clients_.push_back(client);
}
void ChromotingHost::DisconnectAllClients() {
DCHECK(CalledOnValidThread());
while (!clients_.empty()) {
size_t size = clients_.size();
clients_.front()->DisconnectSession(protocol::OK);
CHECK_EQ(clients_.size(), size - 1);
}
}
} // namespace remoting