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// Copyright 2012 The Chromium Authors
// 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 <string>
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/compiler_specific.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/threading/thread.h"
#include "net/base/address_tracker_linux.h"
#include "net/dns/dns_config_service_posix.h"
namespace net {
// A collection of objects that live on blocking threads.
class NetworkChangeNotifierLinux::BlockingThreadObjects {
public:
explicit BlockingThreadObjects(
const std::unordered_set<std::string>& ignored_interfaces);
BlockingThreadObjects(const BlockingThreadObjects&) = delete;
BlockingThreadObjects& operator=(const BlockingThreadObjects&) = delete;
// 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_;
}
// Begin watching for DNS and netlink changes.
void Init();
private:
void OnIPAddressChanged();
void OnLinkChanged();
// Used to detect online/offline state and IP address changes.
internal::AddressTrackerLinux address_tracker_;
NetworkChangeNotifier::ConnectionType last_type_ =
NetworkChangeNotifier::CONNECTION_NONE;
};
NetworkChangeNotifierLinux::BlockingThreadObjects::BlockingThreadObjects(
const std::unordered_set<std::string>& ignored_interfaces)
: address_tracker_(
base::BindRepeating(&NetworkChangeNotifierLinux::
BlockingThreadObjects::OnIPAddressChanged,
base::Unretained(this)),
base::BindRepeating(
&NetworkChangeNotifierLinux::BlockingThreadObjects::OnLinkChanged,
base::Unretained(this)),
base::DoNothing(),
ignored_interfaces) {}
void NetworkChangeNotifierLinux::BlockingThreadObjects::Init() {
address_tracker_.Init();
last_type_ = GetCurrentConnectionType();
}
void NetworkChangeNotifierLinux::BlockingThreadObjects::OnIPAddressChanged() {
NetworkChangeNotifier::NotifyObserversOfIPAddressChange();
// When the IP address of a network interface is added/deleted, the
// connection type may have changed.
OnLinkChanged();
}
void NetworkChangeNotifierLinux::BlockingThreadObjects::OnLinkChanged() {
if (last_type_ != GetCurrentConnectionType()) {
NetworkChangeNotifier::NotifyObserversOfConnectionTypeChange();
last_type_ = GetCurrentConnectionType();
double max_bandwidth_mbps =
NetworkChangeNotifier::GetMaxBandwidthMbpsForConnectionSubtype(
last_type_ == CONNECTION_NONE ? SUBTYPE_NONE : SUBTYPE_UNKNOWN);
NetworkChangeNotifier::NotifyObserversOfMaxBandwidthChange(
max_bandwidth_mbps, last_type_);
}
}
NetworkChangeNotifierLinux::NetworkChangeNotifierLinux(
const std::unordered_set<std::string>& ignored_interfaces)
: NetworkChangeNotifier(NetworkChangeCalculatorParamsLinux()),
blocking_thread_runner_(
base::ThreadPool::CreateSequencedTaskRunner({base::MayBlock()})),
blocking_thread_objects_(
new BlockingThreadObjects(ignored_interfaces),
// Ensure |blocking_thread_objects_| lives on
// |blocking_thread_runner_| to prevent races where
// NetworkChangeNotifierLinux outlives
// TaskEnvironment. https://crbug.com/938126
base::OnTaskRunnerDeleter(blocking_thread_runner_)) {
blocking_thread_runner_->PostTask(
FROM_HERE,
base::BindOnce(&NetworkChangeNotifierLinux::BlockingThreadObjects::Init,
// The Unretained pointer is safe here because it's
// posted before the deleter can post.
base::Unretained(blocking_thread_objects_.get())));
}
NetworkChangeNotifierLinux::~NetworkChangeNotifierLinux() {
ClearGlobalPointer();
}
// 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::Milliseconds(2000);
params.ip_address_online_delay_ = base::Milliseconds(2000);
params.connection_type_offline_delay_ = base::Milliseconds(1500);
params.connection_type_online_delay_ = base::Milliseconds(500);
return params;
}
NetworkChangeNotifier::ConnectionType
NetworkChangeNotifierLinux::GetCurrentConnectionType() const {
return blocking_thread_objects_->GetCurrentConnectionType();
}
const internal::AddressTrackerLinux*
NetworkChangeNotifierLinux::GetAddressTrackerInternal() const {
return blocking_thread_objects_->address_tracker();
}
} // namespace net
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