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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.
#ifndef NET_BASE_ADDRESS_TRACKER_LINUX_H_
#define NET_BASE_ADDRESS_TRACKER_LINUX_H_
#include <sys/socket.h> // Needed to include netlink.
// Mask superfluous definition of |struct net|. This is fixed in Linux 2.6.38.
#define net net_kernel
#include <linux/rtnetlink.h>
#undef net
#include <map>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/hash_tables.h"
#include "base/message_loop.h"
#include "base/synchronization/condition_variable.h"
#include "base/synchronization/lock.h"
#include "net/base/net_util.h"
#include "net/base/network_change_notifier.h"
namespace net {
namespace internal {
// Keeps track of network interface addresses using rtnetlink. Used by
// NetworkChangeNotifier to provide signals to registered IPAddressObservers.
class NET_EXPORT_PRIVATE AddressTrackerLinux
: public MessageLoopForIO::Watcher {
public:
typedef std::map<IPAddressNumber, struct ifaddrmsg> AddressMap;
// Will run |address_callback| when the AddressMap changes and will run
// |link_callback| when the list of online links changes.
AddressTrackerLinux(const base::Closure& address_callback,
const base::Closure& link_callback);
virtual ~AddressTrackerLinux();
// Starts watching system configuration for changes. The current thread must
// have a MessageLoopForIO.
void Init();
AddressMap GetAddressMap() const;
// Implementation of NetworkChangeNotifierLinux::GetCurrentConnectionType().
// Safe to call from any thread, but will block until Init() has completed.
NetworkChangeNotifier::ConnectionType GetCurrentConnectionType();
private:
friend class AddressTrackerLinuxTest;
// Sets |*address_changed| to indicate whether |address_map_| changed and
// sets |*link_changed| to indicate if |online_links_| changed while reading
// messages from |netlink_fd_|.
void ReadMessages(bool* address_changed, bool* link_changed);
// Sets |*address_changed| to true if |address_map_| changed, sets
// |*link_changed| to true if |online_links_| changed while reading the
// message from |buffer|.
void HandleMessage(const char* buffer,
size_t length,
bool* address_changed,
bool* link_changed);
// Call when some part of initialization failed; forces online and unblocks.
void AbortAndForceOnline();
// MessageLoopForIO::Watcher:
virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
virtual void OnFileCanWriteWithoutBlocking(int /* fd */) OVERRIDE;
// Close |netlink_fd_|
void CloseSocket();
base::Closure address_callback_;
base::Closure link_callback_;
int netlink_fd_;
MessageLoopForIO::FileDescriptorWatcher watcher_;
mutable base::Lock address_map_lock_;
AddressMap address_map_;
// Set of interface indices for links that are currently online.
base::hash_set<int> online_links_;
base::Lock is_offline_lock_;
bool is_offline_;
bool is_offline_initialized_;
base::ConditionVariable is_offline_initialized_cv_;
};
} // namespace internal
} // namespace net
#endif // NET_BASE_ADDRESS_TRACKER_LINUX_H_
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