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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 "net/base/network_change_notifier_linux.h"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/threading/thread.h"
#include "net/base/address_tracker_linux.h"
#include "net/dns/dns_config_service.h"
namespace net {
class NetworkChangeNotifierLinux::Thread : public base::Thread {
public:
explicit Thread(const base::hash_set<std::string>& ignored_interfaces);
~Thread() override;
// Plumbing for NetworkChangeNotifier::GetCurrentConnectionType.
// Safe to call from any thread.
NetworkChangeNotifier::ConnectionType GetCurrentConnectionType() {
return address_tracker_->GetCurrentConnectionType();
}
const internal::AddressTrackerLinux* address_tracker() const {
return address_tracker_.get();
}
protected:
// base::Thread
void Init() override;
void CleanUp() override;
private:
void OnIPAddressChanged();
void OnLinkChanged();
scoped_ptr<DnsConfigService> dns_config_service_;
// Used to detect online/offline state and IP address changes.
scoped_ptr<internal::AddressTrackerLinux> address_tracker_;
NetworkChangeNotifier::ConnectionType last_type_;
DISALLOW_COPY_AND_ASSIGN(Thread);
};
NetworkChangeNotifierLinux::Thread::Thread(
const base::hash_set<std::string>& ignored_interfaces)
: base::Thread("NetworkChangeNotifier"),
address_tracker_(new internal::AddressTrackerLinux(
base::Bind(&NetworkChangeNotifierLinux::Thread::OnIPAddressChanged,
base::Unretained(this)),
base::Bind(&NetworkChangeNotifierLinux::Thread::OnLinkChanged,
base::Unretained(this)),
base::Bind(base::DoNothing),
ignored_interfaces)),
last_type_(NetworkChangeNotifier::CONNECTION_NONE) {}
NetworkChangeNotifierLinux::Thread::~Thread() {
DCHECK(!Thread::IsRunning());
}
void NetworkChangeNotifierLinux::Thread::Init() {
address_tracker_->Init();
dns_config_service_ = DnsConfigService::CreateSystemService();
dns_config_service_->WatchConfig(
base::Bind(&NetworkChangeNotifier::SetDnsConfig));
}
void NetworkChangeNotifierLinux::Thread::CleanUp() {
// Delete AddressTrackerLinux before MessageLoop gets deleted as
// AddressTrackerLinux's FileDescriptorWatcher holds a pointer to the
// MessageLoop.
address_tracker_.reset();
dns_config_service_.reset();
}
void NetworkChangeNotifierLinux::Thread::OnIPAddressChanged() {
NetworkChangeNotifier::NotifyObserversOfIPAddressChange();
// When the IP address of a network interface is added/deleted, the
// connection type may have changed.
OnLinkChanged();
}
void NetworkChangeNotifierLinux::Thread::OnLinkChanged() {
if (last_type_ != GetCurrentConnectionType()) {
NetworkChangeNotifier::NotifyObserversOfConnectionTypeChange();
last_type_ = GetCurrentConnectionType();
double max_bandwidth_mbps =
NetworkChangeNotifier::GetMaxBandwidthForConnectionSubtype(
last_type_ == CONNECTION_NONE ? SUBTYPE_NONE : SUBTYPE_UNKNOWN);
NetworkChangeNotifier::NotifyObserversOfMaxBandwidthChange(
max_bandwidth_mbps, last_type_);
}
}
NetworkChangeNotifierLinux::NetworkChangeNotifierLinux(
const base::hash_set<std::string>& ignored_interfaces)
: NetworkChangeNotifier(NetworkChangeCalculatorParamsLinux()),
notifier_thread_(new Thread(ignored_interfaces)) {
// We create this notifier thread because the notification implementation
// needs a MessageLoopForIO, and there's no guarantee that
// MessageLoop::current() meets that criterion.
base::Thread::Options thread_options(base::MessageLoop::TYPE_IO, 0);
notifier_thread_->StartWithOptions(thread_options);
}
NetworkChangeNotifierLinux::~NetworkChangeNotifierLinux() {
// Stopping from here allows us to sanity- check that the notifier
// thread shut down properly.
notifier_thread_->Stop();
}
// static
NetworkChangeNotifier::NetworkChangeCalculatorParams
NetworkChangeNotifierLinux::NetworkChangeCalculatorParamsLinux() {
NetworkChangeCalculatorParams params;
// Delay values arrived at by simple experimentation and adjusted so as to
// produce a single signal when switching between network connections.
params.ip_address_offline_delay_ = base::TimeDelta::FromMilliseconds(2000);
params.ip_address_online_delay_ = base::TimeDelta::FromMilliseconds(2000);
params.connection_type_offline_delay_ =
base::TimeDelta::FromMilliseconds(1500);
params.connection_type_online_delay_ = base::TimeDelta::FromMilliseconds(500);
return params;
}
NetworkChangeNotifier::ConnectionType
NetworkChangeNotifierLinux::GetCurrentConnectionType() const {
return notifier_thread_->GetCurrentConnectionType();
}
const internal::AddressTrackerLinux*
NetworkChangeNotifierLinux::GetAddressTrackerInternal() const {
return notifier_thread_->address_tracker();
}
} // namespace net
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