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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/message_loop.h"
#include "base/synchronization/lock.h"
#include "net/base/net_util.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 |callback| when the AddressMap changes.
explicit AddressTrackerLinux(const base::Closure& callback);
virtual ~AddressTrackerLinux();
// Starts watching system configuration for changes. The current thread must
// have a MessageLoopForIO.
void Init();
AddressMap GetAddressMap() const;
private:
friend class AddressTrackerLinuxTest;
// Returns true if |map_| changed while reading messages from |netlink_fd_|.
bool ReadMessages();
// Returns true if |map_| changed while reading the message from |buffer|.
bool HandleMessage(const char* buffer, size_t length);
// MessageLoopForIO::Watcher:
virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
virtual void OnFileCanWriteWithoutBlocking(int /* fd */) OVERRIDE;
base::Closure callback_;
int netlink_fd_;
MessageLoopForIO::FileDescriptorWatcher watcher_;
mutable base::Lock lock_;
AddressMap map_;
};
} // namespace internal
} // namespace net
#endif // NET_BASE_ADDRESS_TRACKER_LINUX_H_
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