chrome/browser/local_discovery/privet_traffic_detector.h

   1 // Copyright 2013 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 #ifndef CHROME_BROWSER_LOCAL_DISCOVERY_PRIVET_TRAFFIC_DETECTOR_H_
   6 #define CHROME_BROWSER_LOCAL_DISCOVERY_PRIVET_TRAFFIC_DETECTOR_H_
   7
   8 #include "base/callback.h"
   9 #include "base/cancelable_callback.h"
  10 #include "content/public/browser/browser_thread.h"
  11 #include "net/base/address_family.h"
  12 #include "net/base/ip_endpoint.h"
  13 #include "net/base/network_change_notifier.h"
  14
  15 namespace net {
  16 class DatagramServerSocket;
  17 class IOBufferWithSize;
  18 }
  19
  20 namespace local_discovery {
  21
  22 // Detects mDns traffic that looks like "Privet" protocol.
  23 // Can produce false positives results, but main task of the class is to avoid
  24 // running full mDns listener if user doesn't have devices.
  25 // When traffic is detected, class fires callback and shutdowns itself.
  26 class PrivetTrafficDetector
  27     : public base::RefCountedThreadSafe<
  28           PrivetTrafficDetector, content::BrowserThread::DeleteOnIOThread>,
  29       private net::NetworkChangeNotifier::NetworkChangeObserver {
  30  public:
  31   PrivetTrafficDetector(net::AddressFamily address_family,
  32                         const base::Closure& on_traffic_detected);
  33
  34   void Start();
  35
  36  private:
  37   friend struct content::BrowserThread::DeleteOnThread<
  38       content::BrowserThread::IO>;
  39   friend class base::DeleteHelper<PrivetTrafficDetector>;
  40   ~PrivetTrafficDetector() override;
  41
  42     // net::NetworkChangeNotifier::NetworkChangeObserver implementation.
  43   void OnNetworkChanged(
  44       net::NetworkChangeNotifier::ConnectionType type) override;
  45
  46   void StartOnIOThread();
  47   void ScheduleRestart();
  48   void Restart(const net::NetworkInterfaceList& networks);
  49   int Bind();
  50   bool IsSourceAcceptable() const;
  51   bool IsPrivetPacket(int rv) const;
  52   int DoLoop(int rv);
  53
  54   base::Closure on_traffic_detected_;
  55   scoped_refptr<base::TaskRunner> callback_runner_;
  56   net::NetworkInterfaceList networks_;
  57   net::AddressFamily address_family_;
  58   net::IPEndPoint recv_addr_;
  59   scoped_ptr<net::DatagramServerSocket> socket_;
  60   scoped_refptr<net::IOBufferWithSize> io_buffer_;
  61   base::Time start_time_;
  62   int restart_attempts_;
  63
  64   base::WeakPtrFactory<PrivetTrafficDetector> weak_ptr_factory_;
  65
  66   DISALLOW_COPY_AND_ASSIGN(PrivetTrafficDetector);
  67 };
  68
  69 }  // namespace local_discovery
  70
  71 #endif  // CHROME_BROWSER_LOCAL_DISCOVERY_PRIVET_TRAFFIC_DETECTOR_H_