net/base/network_change_notifier_linux.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/base/network_change_notifier_linux.h"
   6
   7 #include "base/bind.h"
   8 #include "base/compiler_specific.h"
   9 #include "base/threading/thread.h"
  10 #include "net/base/address_tracker_linux.h"
  11 #include "net/dns/dns_config_service.h"
  12
  13 namespace net {
  14
  15 class NetworkChangeNotifierLinux::Thread : public base::Thread {
  16  public:
  17   explicit Thread(const base::hash_set<std::string>& ignored_interfaces);
  18   ~Thread() override;
  19
  20   // Plumbing for NetworkChangeNotifier::GetCurrentConnectionType.
  21   // Safe to call from any thread.
  22   NetworkChangeNotifier::ConnectionType GetCurrentConnectionType() {
  23     return address_tracker_.GetCurrentConnectionType();
  24   }
  25
  26   const internal::AddressTrackerLinux* address_tracker() const {
  27     return &address_tracker_;
  28   }
  29
  30  protected:
  31   // base::Thread
  32   void Init() override;
  33   void CleanUp() override;
  34
  35  private:
  36   void OnIPAddressChanged();
  37   void OnLinkChanged();
  38   scoped_ptr<DnsConfigService> dns_config_service_;
  39   // Used to detect online/offline state and IP address changes.
  40   internal::AddressTrackerLinux address_tracker_;
  41   NetworkChangeNotifier::ConnectionType last_type_;
  42
  43   DISALLOW_COPY_AND_ASSIGN(Thread);
  44 };
  45
  46 NetworkChangeNotifierLinux::Thread::Thread(
  47     const base::hash_set<std::string>& ignored_interfaces)
  48     : base::Thread("NetworkChangeNotifier"),
  49       address_tracker_(
  50           base::Bind(&NetworkChangeNotifierLinux::Thread::OnIPAddressChanged,
  51                      base::Unretained(this)),
  52           base::Bind(&NetworkChangeNotifierLinux::Thread::OnLinkChanged,
  53                      base::Unretained(this)),
  54           base::Bind(base::DoNothing),
  55           ignored_interfaces),
  56       last_type_(NetworkChangeNotifier::CONNECTION_NONE) {
  57 }
  58
  59 NetworkChangeNotifierLinux::Thread::~Thread() {
  60   DCHECK(!Thread::IsRunning());
  61 }
  62
  63 void NetworkChangeNotifierLinux::Thread::Init() {
  64   address_tracker_.Init();
  65   dns_config_service_ = DnsConfigService::CreateSystemService();
  66   dns_config_service_->WatchConfig(
  67       base::Bind(&NetworkChangeNotifier::SetDnsConfig));
  68 }
  69
  70 void NetworkChangeNotifierLinux::Thread::CleanUp() {
  71   dns_config_service_.reset();
  72 }
  73
  74 void NetworkChangeNotifierLinux::Thread::OnIPAddressChanged() {
  75   NetworkChangeNotifier::NotifyObserversOfIPAddressChange();
  76   // When the IP address of a network interface is added/deleted, the
  77   // connection type may have changed.
  78   OnLinkChanged();
  79 }
  80
  81 void NetworkChangeNotifierLinux::Thread::OnLinkChanged() {
  82   if (last_type_ != GetCurrentConnectionType()) {
  83     NetworkChangeNotifier::NotifyObserversOfConnectionTypeChange();
  84     last_type_ = GetCurrentConnectionType();
  85   }
  86 }
  87
  88 NetworkChangeNotifierLinux::NetworkChangeNotifierLinux(
  89     const base::hash_set<std::string>& ignored_interfaces)
  90     : NetworkChangeNotifier(NetworkChangeCalculatorParamsLinux()),
  91       notifier_thread_(new Thread(ignored_interfaces)) {
  92   // We create this notifier thread because the notification implementation
  93   // needs a MessageLoopForIO, and there's no guarantee that
  94   // MessageLoop::current() meets that criterion.
  95   base::Thread::Options thread_options(base::MessageLoop::TYPE_IO, 0);
  96   notifier_thread_->StartWithOptions(thread_options);
  97 }
  98
  99 NetworkChangeNotifierLinux::~NetworkChangeNotifierLinux() {
 100   // Stopping from here allows us to sanity- check that the notifier
 101   // thread shut down properly.
 102   notifier_thread_->Stop();
 103 }
 104
 105 // static
 106 NetworkChangeNotifier::NetworkChangeCalculatorParams
 107 NetworkChangeNotifierLinux::NetworkChangeCalculatorParamsLinux() {
 108   NetworkChangeCalculatorParams params;
 109   // Delay values arrived at by simple experimentation and adjusted so as to
 110   // produce a single signal when switching between network connections.
 111   params.ip_address_offline_delay_ = base::TimeDelta::FromMilliseconds(2000);
 112   params.ip_address_online_delay_ = base::TimeDelta::FromMilliseconds(2000);
 113   params.connection_type_offline_delay_ =
 114       base::TimeDelta::FromMilliseconds(1500);
 115   params.connection_type_online_delay_ = base::TimeDelta::FromMilliseconds(500);
 116   return params;
 117 }
 118
 119 NetworkChangeNotifier::ConnectionType
 120 NetworkChangeNotifierLinux::GetCurrentConnectionType() const {
 121   return notifier_thread_->GetCurrentConnectionType();
 122 }
 123
 124 const internal::AddressTrackerLinux*
 125 NetworkChangeNotifierLinux::GetAddressTrackerInternal() const {
 126   return notifier_thread_->address_tracker();
 127 }
 128
 129 }  // namespace net