Revert "Offline state detection for linux, using new D-Bus library."

net/base/network_change_notifier_linux.cc

 // Copyright (c) 2011 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.
-//
-// This implementation of NetworkChangeNotifier's offline state detection
-// depends on D-Bus and NetworkManager, and is known to work on at least
-// GNOME version 2.30.  If D-Bus or NetworkManager are unavailable, this
-// implementation will always behave as if it is online.
 
 #include "net/base/network_change_notifier_linux.h"
 
 #include <errno.h>
 #include <sys/socket.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/eintr_wrapper.h"
 #include "base/file_util.h"
 #include "base/files/file_path_watcher.h"
 #include "base/memory/weak_ptr.h"
-#include "base/synchronization/lock.h"
-#include "base/synchronization/waitable_event.h"
-#include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
-#include "dbus/bus.h"
-#include "dbus/message.h"
-#include "dbus/object_proxy.h"
 #include "net/base/net_errors.h"
 #include "net/base/network_change_notifier_netlink_linux.h"
 
 using ::base::files::FilePathWatcher;
 
 namespace net {
 
 namespace {
 
 const int kInvalidSocket = -1;
 
-const char kNetworkManagerServiceName[] = "org.freedesktop.NetworkManager";
-const char kNetworkManagerPath[] = "/org/freedesktop/NetworkManager";
-const char kNetworkManagerInterface[] = "org.freedesktop.NetworkManager";
-
-// http://projects.gnome.org/NetworkManager/developers/spec-08.html#type-NM_STATE
-enum {
-  NM_LEGACY_STATE_UNKNOWN = 0,
-  NM_LEGACY_STATE_ASLEEP = 1,
-  NM_LEGACY_STATE_CONNECTING = 2,
-  NM_LEGACY_STATE_CONNECTED = 3,
-  NM_LEGACY_STATE_DISCONNECTED = 4
-};
-
-// http://projects.gnome.org/NetworkManager/developers/migrating-to-09/spec.html#type-NM_STATE
-enum {
-  NM_STATE_UNKNOWN = 0,
-  NM_STATE_ASLEEP = 10,
-  NM_STATE_DISCONNECTED = 20,
-  NM_STATE_DISCONNECTING = 30,
-  NM_STATE_CONNECTING = 40,
-  NM_STATE_CONNECTED_LOCAL = 50,
-  NM_STATE_CONNECTED_SITE = 60,
-  NM_STATE_CONNECTED_GLOBAL = 70
-};
-
-// A wrapper around NetworkManager's D-Bus API.
-class NetworkManagerApi {
- public:
-  NetworkManagerApi(const base::Closure& notification_callback, dbus::Bus* bus)
-      : is_offline_(false),
-        offline_state_initialized_(true /*manual_reset*/, false),
-        notification_callback_(notification_callback),
-        helper_thread_id_(base::kInvalidThreadId),
-        ALLOW_THIS_IN_INITIALIZER_LIST(ptr_factory_(this)),
-        system_bus_(bus) { }
-
-  ~NetworkManagerApi() { }
-
-  // Should be called on a helper thread which must be of type IO.
-  void Init();
-
-  // Must be called by the helper thread's CleanUp() method.
-  void CleanUp();
-
-  // Implementation of NetworkChangeNotifierLinux::IsCurrentlyOffline().
-  // Safe to call from any thread, but will block until Init() has completed.
-  bool IsCurrentlyOffline();
-
- private:
-  // Callbacks for D-Bus API.
-  void OnStateChanged(dbus::Message* message);
-
-  void OnResponse(dbus::Response* response) {
-    OnStateChanged(response);
-    offline_state_initialized_.Signal();
-  }
-
-  void OnSignaled(dbus::Signal* signal) {
-    OnStateChanged(signal);
-  }
-
-  void OnConnected(const std::string&, const std::string&, bool success) {
-    if (!success) {
-      DLOG(WARNING) << "Failed to set up offline state detection";
-      offline_state_initialized_.Signal();
-    }
-  }
-
-  // Converts a NetworkManager state uint to a bool.
-  static bool StateIsOffline(uint32 state);
-
-  bool is_offline_;
-  base::Lock is_offline_lock_;
-  base::WaitableEvent offline_state_initialized_;
-
-  base::Closure notification_callback_;
-
-  base::PlatformThreadId helper_thread_id_;
-
-  base::WeakPtrFactory<NetworkManagerApi> ptr_factory_;
-
-  scoped_refptr<dbus::Bus> system_bus_;
-
-  DISALLOW_COPY_AND_ASSIGN(NetworkManagerApi);
-};
-
-void NetworkManagerApi::Init() {
-  // D-Bus requires an IO MessageLoop.
-  DCHECK_EQ(MessageLoop::current()->type(), MessageLoop::TYPE_IO);
-  helper_thread_id_ = base::PlatformThread::CurrentId();
-
-  if (!system_bus_) {
-    dbus::Bus::Options options;
-    options.bus_type = dbus::Bus::SYSTEM;
-    options.connection_type = dbus::Bus::PRIVATE;
-    system_bus_ = new dbus::Bus(options);
-  }
-
-  dbus::ObjectProxy* proxy =
-      system_bus_->GetObjectProxy(kNetworkManagerServiceName,
-                                  kNetworkManagerPath);
-
-  // Get the initial state asynchronously.
-  dbus::MethodCall method_call(DBUS_INTERFACE_PROPERTIES, "Get");
-  dbus::MessageWriter builder(&method_call);
-  builder.AppendString(kNetworkManagerInterface);
-  builder.AppendString("State");
-  proxy->CallMethod(
-      &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
-      base::Bind(&NetworkManagerApi::OnResponse, ptr_factory_.GetWeakPtr()));
-
-  // And sign up for notifications.
-  proxy->ConnectToSignal(
-      kNetworkManagerInterface,
-      "StateChanged",
-      base::Bind(&NetworkManagerApi::OnSignaled, ptr_factory_.GetWeakPtr()),
-      base::Bind(&NetworkManagerApi::OnConnected, ptr_factory_.GetWeakPtr()));
-}
-
-void NetworkManagerApi::CleanUp() {
-  DCHECK_EQ(helper_thread_id_, base::PlatformThread::CurrentId());
-  ptr_factory_.InvalidateWeakPtrs();
-}
-
-void NetworkManagerApi::OnStateChanged(dbus::Message* message) {
-  DCHECK_EQ(helper_thread_id_, base::PlatformThread::CurrentId());
-  if (!message) {
-    DLOG(WARNING) << "No response received for initial state request";
-    return;
-  }
-  dbus::MessageReader reader(message);
-  uint32 state = 0;
-  if (!reader.HasMoreData() || !reader.PopUint32(&state)) {
-    DLOG(WARNING) << "Unexpected response for NetworkManager State request: "
-                  << message->ToString();
-    return;
-  }
-  bool new_is_offline = StateIsOffline(state);
-  {
-    base::AutoLock lock(is_offline_lock_);
-    if (is_offline_ != new_is_offline)
-      is_offline_ = new_is_offline;
-    else
-      return;
-  }
-  if (offline_state_initialized_.IsSignaled())
-    notification_callback_.Run();
-}
-
-bool NetworkManagerApi::StateIsOffline(uint32 state) {
-  switch (state) {
-    case NM_LEGACY_STATE_CONNECTED:
-    case NM_STATE_CONNECTED_SITE:
-    case NM_STATE_CONNECTED_GLOBAL:
-      // Definitely connected
-      return false;
-    case NM_LEGACY_STATE_DISCONNECTED:
-    case NM_STATE_DISCONNECTED:
-      // Definitely disconnected
-      return true;
-    case NM_STATE_CONNECTED_LOCAL:
-      // Local networking only; I'm treating this as offline (keybuk)
-      return true;
-    case NM_LEGACY_STATE_CONNECTING:
-    case NM_STATE_DISCONNECTING:
-    case NM_STATE_CONNECTING:
-      // In-flight change to connection status currently underway
-      return true;
-    case NM_LEGACY_STATE_ASLEEP:
-    case NM_STATE_ASLEEP:
-      // Networking disabled or no devices on system
-      return true;
-    default:
-      // Unknown status
-      return false;
-  }
-}
-
-bool NetworkManagerApi::IsCurrentlyOffline() {
-  offline_state_initialized_.Wait();
-  base::AutoLock lock(is_offline_lock_);
-  return is_offline_;
-}
-
 class DNSWatchDelegate : public FilePathWatcher::Delegate {
  public:
   explicit DNSWatchDelegate(const base::Closure& callback)
       : callback_(callback) {}
   virtual ~DNSWatchDelegate() {}
   // FilePathWatcher::Delegate interface
   virtual void OnFilePathChanged(const FilePath& path) OVERRIDE;
   virtual void OnFilePathError(const FilePath& path) OVERRIDE;
  private:
   base::Closure callback_;
   DISALLOW_COPY_AND_ASSIGN(DNSWatchDelegate);
 };
 
 void DNSWatchDelegate::OnFilePathChanged(const FilePath& path) {
   // Calls NetworkChangeNotifier::NotifyObserversOfDNSChange().
   callback_.Run();
 }
 
 void DNSWatchDelegate::OnFilePathError(const FilePath& path) {
   LOG(ERROR) << "DNSWatchDelegate::OnFilePathError for " << path.value();
 }
 
 }  // namespace
 
 class NetworkChangeNotifierLinux::Thread
     : public base::Thread, public MessageLoopForIO::Watcher {
  public:
-  explicit Thread(dbus::Bus* bus);
+  Thread();
   virtual ~Thread();
 
   // MessageLoopForIO::Watcher:
   virtual void OnFileCanReadWithoutBlocking(int fd);
   virtual void OnFileCanWriteWithoutBlocking(int /* fd */);
 
-  // Plumbing for NetworkChangeNotifier::IsCurrentlyOffline.
-  // Safe to call from any thread.
-  bool IsCurrentlyOffline() {
-    return network_manager_api_.IsCurrentlyOffline();
-  }
-
  protected:
   // base::Thread
   virtual void Init();
   virtual void CleanUp();
 
  private:
   void NotifyObserversOfIPAddressChange() {
     NetworkChangeNotifier::NotifyObserversOfIPAddressChange();
   }
 
-  static void NotifyObserversOfDNSChange() {
+  void NotifyObserversOfDNSChange() {
     NetworkChangeNotifier::NotifyObserversOfDNSChange();
   }
 
-  static void NotifyObserversOfOnlineStateChange() {
-    NetworkChangeNotifier::NotifyObserversOfOnlineStateChange();
-  }
-
   // Starts listening for netlink messages.  Also handles the messages if there
   // are any available on the netlink socket.
   void ListenForNotifications();
 
   // Attempts to read from the netlink socket into |buf| of length |len|.
   // Returns the bytes read on synchronous success and ERR_IO_PENDING if the
   // recv() would block.  Otherwise, it returns a net error code.
   int ReadNotificationMessage(char* buf, size_t len);
 
   // The netlink socket descriptor.
   int netlink_fd_;
   MessageLoopForIO::FileDescriptorWatcher netlink_watcher_;
 
   // Technically only needed for ChromeOS, but it's ugly to #ifdef out.
   base::WeakPtrFactory<Thread> ptr_factory_;
 
   // Used to watch for changes to /etc/resolv.conf and /etc/hosts.
   scoped_ptr<base::files::FilePathWatcher> resolv_file_watcher_;
   scoped_ptr<base::files::FilePathWatcher> hosts_file_watcher_;
   scoped_refptr<DNSWatchDelegate> file_watcher_delegate_;
 
-  // Used to detect online/offline state changes.
-  NetworkManagerApi network_manager_api_;
-
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
-NetworkChangeNotifierLinux::Thread::Thread(dbus::Bus* bus)
+NetworkChangeNotifierLinux::Thread::Thread()
     : base::Thread("NetworkChangeNotifier"),
       netlink_fd_(kInvalidSocket),
-      ALLOW_THIS_IN_INITIALIZER_LIST(ptr_factory_(this)),
-      network_manager_api_(
-          base::Bind(&NetworkChangeNotifierLinux::Thread
-                     ::NotifyObserversOfOnlineStateChange),
-          bus) {
+      ALLOW_THIS_IN_INITIALIZER_LIST(ptr_factory_(this)) {
 }
 
 NetworkChangeNotifierLinux::Thread::~Thread() {
   DCHECK(!Thread::IsRunning());
 }
 
 void NetworkChangeNotifierLinux::Thread::Init() {
   resolv_file_watcher_.reset(new FilePathWatcher);
   hosts_file_watcher_.reset(new FilePathWatcher);
   file_watcher_delegate_ = new DNSWatchDelegate(base::Bind(
-      &NetworkChangeNotifierLinux::Thread::NotifyObserversOfDNSChange));
+      &NetworkChangeNotifierLinux::Thread::NotifyObserversOfDNSChange,
+      base::Unretained(this)));
   if (!resolv_file_watcher_->Watch(
           FilePath(FILE_PATH_LITERAL("/etc/resolv.conf")),
           file_watcher_delegate_.get())) {
     LOG(ERROR) << "Failed to setup watch for /etc/resolv.conf";
   }
   if (!hosts_file_watcher_->Watch(FilePath(FILE_PATH_LITERAL("/etc/hosts")),
           file_watcher_delegate_.get())) {
     LOG(ERROR) << "Failed to setup watch for /etc/hosts";
   }
   netlink_fd_ = InitializeNetlinkSocket();
   if (netlink_fd_ < 0) {
     netlink_fd_ = kInvalidSocket;
     return;
   }
   ListenForNotifications();
-
-  network_manager_api_.Init();
 }
 
 void NetworkChangeNotifierLinux::Thread::CleanUp() {
   if (netlink_fd_ != kInvalidSocket) {
     if (HANDLE_EINTR(close(netlink_fd_)) != 0)
       PLOG(ERROR) << "Failed to close socket";
     netlink_fd_ = kInvalidSocket;
     netlink_watcher_.StopWatchingFileDescriptor();
   }
   // Kill watchers early to make sure they won't try to call
   // into us via the delegate during destruction.
   resolv_file_watcher_.reset();
   hosts_file_watcher_.reset();
-
-  network_manager_api_.CleanUp();
 }
 
 void NetworkChangeNotifierLinux::Thread::OnFileCanReadWithoutBlocking(int fd) {
   DCHECK_EQ(fd, netlink_fd_);
   ListenForNotifications();
 }
 
 void NetworkChangeNotifierLinux::Thread::OnFileCanWriteWithoutBlocking(
     int /* fd */) {
   NOTREACHED();
@@ skipping 43 matching lines @@
 
   DCHECK_NE(rv, 0);
   if (errno != EAGAIN && errno != EWOULDBLOCK) {
     PLOG(DFATAL) << "recv";
     return ERR_FAILED;
   }
 
   return ERR_IO_PENDING;
 }
 
-NetworkChangeNotifierLinux* NetworkChangeNotifierLinux::Create() {
-  return new NetworkChangeNotifierLinux(NULL);
-}
-
-NetworkChangeNotifierLinux* NetworkChangeNotifierLinux::CreateForTest(
-    dbus::Bus* bus) {
-  return new NetworkChangeNotifierLinux(bus);
-}
-
-NetworkChangeNotifierLinux::NetworkChangeNotifierLinux(dbus::Bus* bus)
-    : notifier_thread_(new Thread(bus)) {
+NetworkChangeNotifierLinux::NetworkChangeNotifierLinux()
+    : notifier_thread_(new Thread) {
   // 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(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();
 }
 
 bool NetworkChangeNotifierLinux::IsCurrentlyOffline() const {
-  return notifier_thread_->IsCurrentlyOffline();
+  // TODO(eroman): http://crbug.com/53473
+  return false;
 }
 
 }  // namespace net