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_STUNPORT_H_
29#define TALK_P2P_BASE_STUNPORT_H_
30
31#include <string>
32
33#include "talk/base/asyncpacketsocket.h"
34#include "talk/p2p/base/udpport.h"
35#include "talk/p2p/base/stunrequest.h"
36
37namespace talk_base {
38class AsyncResolver;
39class SignalThread;
40}
41
42namespace cricket {
43
44extern const std::string STUN_PORT_TYPE;
45
46// Communicates using the address on the outside of a NAT.
47class StunPort : public Port {
48 public:
49  static StunPort* Create(talk_base::Thread* thread,
50                          talk_base::PacketSocketFactory* factory,
51                          talk_base::Network* network,
52                          uint32 ip, int min_port, int max_port,
53                          const talk_base::SocketAddress& server_addr) {
54    StunPort* port = new StunPort(thread, factory, network,
55                                  ip, min_port, max_port, server_addr);
56    if (!port->Init()) {
57      delete port;
58      port = NULL;
59    }
60    return port;
61  }
62  virtual ~StunPort();
63
64  const talk_base::SocketAddress& server_addr() const { return server_addr_; }
65  void set_server_addr(const talk_base::SocketAddress& addr) {
66    server_addr_ = addr;
67  }
68
69  const talk_base::SocketAddress& server_addr2() const { return server_addr2_; }
70  void set_server_addr2(const talk_base::SocketAddress& addr) {
71    server_addr2_ = addr;
72  }
73
74  virtual void PrepareAddress();
75
76  // This will contact the secondary server and signal another candidate
77  // address for this port (which may be the same as the first address).
78  void PrepareSecondaryAddress();
79
80  virtual Connection* CreateConnection(const Candidate& address,
81                                       CandidateOrigin origin);
82  virtual int SetOption(talk_base::Socket::Option opt, int value);
83  virtual int GetError();
84
85 protected:
86  StunPort(talk_base::Thread* thread, talk_base::PacketSocketFactory* factory,
87           talk_base::Network* network, uint32 ip, int min_port, int max_port,
88           const talk_base::SocketAddress& server_addr);
89  bool Init();
90
91  virtual int SendTo(const void* data, size_t size,
92                     const talk_base::SocketAddress& addr, bool payload);
93
94  void OnReadPacket(talk_base::AsyncPacketSocket* socket,
95                    const char* data, size_t size,
96                    const talk_base::SocketAddress& remote_addr);
97
98 private:
99  // DNS resolution of the STUN server.
100  void ResolveStunAddress();
101  void OnResolveResult(talk_base::SignalThread* thread);
102  // Sends STUN requests to the server.
103  void OnSendPacket(const void* data, size_t size, StunRequest* req);
104
105  talk_base::SocketAddress server_addr_;
106  talk_base::SocketAddress server_addr2_;
107  StunRequestManager requests_;
108  talk_base::AsyncPacketSocket* socket_;
109  int error_;
110  talk_base::AsyncResolver* resolver_;
111
112  friend class StunPortBindingRequest;
113};
114
115}  // namespace cricket
116
117#endif  // TALK_P2P_BASE_STUNPORT_H_
118