1/*
2 * libjingle
3 * Copyright 2004--2005, Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef TALK_P2P_BASE_STUNSERVER_H_
29#define TALK_P2P_BASE_STUNSERVER_H_
30
31#include "talk/base/asyncudpsocket.h"
32#include "talk/base/scoped_ptr.h"
33#include "talk/p2p/base/stun.h"
34
35namespace cricket {
36
37const int STUN_SERVER_PORT = 3478;
38
39class StunServer : public sigslot::has_slots<> {
40 public:
41  // Creates a STUN server, which will listen on the given socket.
42  explicit StunServer(talk_base::AsyncUDPSocket* socket);
43  // Removes the STUN server from the socket and deletes the socket.
44  ~StunServer();
45
46 protected:
47  // Slot for AsyncSocket.PacketRead:
48  void OnPacket(
49      talk_base::AsyncPacketSocket* socket, const char* buf, size_t size,
50      const talk_base::SocketAddress& remote_addr);
51
52  // Handlers for the different types of STUN/TURN requests:
53  void OnBindingRequest(StunMessage* msg,
54      const talk_base::SocketAddress& addr);
55  void OnAllocateRequest(StunMessage* msg,
56      const talk_base::SocketAddress& addr);
57  void OnSharedSecretRequest(StunMessage* msg,
58      const talk_base::SocketAddress& addr);
59  void OnSendRequest(StunMessage* msg,
60      const talk_base::SocketAddress& addr);
61
62  // Sends an error response to the given message back to the user.
63  void SendErrorResponse(
64      const StunMessage& msg, const talk_base::SocketAddress& addr,
65      int error_code, const char* error_desc);
66
67  // Sends the given message to the appropriate destination.
68  void SendResponse(const StunMessage& msg,
69       const talk_base::SocketAddress& addr);
70
71 private:
72  talk_base::scoped_ptr<talk_base::AsyncUDPSocket> socket_;
73};
74
75}  // namespace cricket
76
77#endif  // TALK_P2P_BASE_STUNSERVER_H_
78