1/*
2 *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#ifndef WEBRTC_BASE_FIREWALLSOCKETSERVER_H_
12#define WEBRTC_BASE_FIREWALLSOCKETSERVER_H_
13
14#include <vector>
15#include "webrtc/base/socketserver.h"
16#include "webrtc/base/criticalsection.h"
17
18namespace rtc {
19
20class FirewallManager;
21
22// This SocketServer shim simulates a rule-based firewall server.
23
24enum FirewallProtocol { FP_UDP, FP_TCP, FP_ANY };
25enum FirewallDirection { FD_IN, FD_OUT, FD_ANY };
26
27class FirewallSocketServer : public SocketServer {
28 public:
29  FirewallSocketServer(SocketServer * server,
30                       FirewallManager * manager = NULL,
31                       bool should_delete_server = false);
32  ~FirewallSocketServer() override;
33
34  SocketServer* socketserver() const { return server_; }
35  void set_socketserver(SocketServer* server) {
36    if (server_ && should_delete_server_) {
37      delete server_;
38      server_ = NULL;
39      should_delete_server_ = false;
40    }
41    server_ = server;
42  }
43
44  // Settings to control whether CreateSocket or Socket::Listen succeed.
45  void set_udp_sockets_enabled(bool enabled) { udp_sockets_enabled_ = enabled; }
46  void set_tcp_sockets_enabled(bool enabled) { tcp_sockets_enabled_ = enabled; }
47  bool tcp_listen_enabled() const { return tcp_listen_enabled_; }
48  void set_tcp_listen_enabled(bool enabled) { tcp_listen_enabled_ = enabled; }
49
50  // Rules govern the behavior of Connect/Accept/Send/Recv attempts.
51  void AddRule(bool allow, FirewallProtocol p = FP_ANY,
52               FirewallDirection d = FD_ANY,
53               const SocketAddress& addr = SocketAddress());
54  void AddRule(bool allow, FirewallProtocol p,
55               const SocketAddress& src, const SocketAddress& dst);
56  void ClearRules();
57
58  bool Check(FirewallProtocol p,
59             const SocketAddress& src, const SocketAddress& dst);
60
61  Socket* CreateSocket(int type) override;
62  Socket* CreateSocket(int family, int type) override;
63
64  AsyncSocket* CreateAsyncSocket(int type) override;
65  AsyncSocket* CreateAsyncSocket(int family, int type) override;
66
67  void SetMessageQueue(MessageQueue* queue) override;
68  bool Wait(int cms, bool process_io) override;
69  void WakeUp() override;
70
71  Socket * WrapSocket(Socket * sock, int type);
72  AsyncSocket * WrapSocket(AsyncSocket * sock, int type);
73
74 private:
75  SocketServer * server_;
76  FirewallManager * manager_;
77  CriticalSection crit_;
78  struct Rule {
79    bool allow;
80    FirewallProtocol p;
81    FirewallDirection d;
82    SocketAddress src;
83    SocketAddress dst;
84  };
85  std::vector<Rule> rules_;
86  bool should_delete_server_;
87  bool udp_sockets_enabled_;
88  bool tcp_sockets_enabled_;
89  bool tcp_listen_enabled_;
90};
91
92// FirewallManager allows you to manage firewalls in multiple threads together
93
94class FirewallManager {
95 public:
96  FirewallManager();
97  ~FirewallManager();
98
99  void AddServer(FirewallSocketServer * server);
100  void RemoveServer(FirewallSocketServer * server);
101
102  void AddRule(bool allow, FirewallProtocol p = FP_ANY,
103               FirewallDirection d = FD_ANY,
104               const SocketAddress& addr = SocketAddress());
105  void ClearRules();
106
107 private:
108  CriticalSection crit_;
109  std::vector<FirewallSocketServer *> servers_;
110};
111
112}  // namespace rtc
113
114#endif  // WEBRTC_BASE_FIREWALLSOCKETSERVER_H_
115