1/*
2 * libjingle
3 * Copyright 2008, 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_BASE_NETHELPERS_H_
29#define TALK_BASE_NETHELPERS_H_
30
31#ifdef POSIX
32#include <netdb.h>
33#include <cstddef>
34#elif WIN32
35#include <winsock2.h>  // NOLINT
36#endif
37
38#include <list>
39
40#include "talk/base/signalthread.h"
41#include "talk/base/sigslot.h"
42#include "talk/base/socketaddress.h"
43
44namespace talk_base {
45
46// AsyncResolver will perform async DNS resolution, signaling the result on
47// the inherited SignalWorkDone when the operation completes.
48class AsyncResolver : public SignalThread {
49 public:
50  AsyncResolver();
51
52  const SocketAddress& address() const { return addr_; }
53  void set_address(const SocketAddress& addr) { addr_ = addr; }
54  int error() const { return error_; }
55  void set_error(int error) { error_ = error; }
56
57 protected:
58  ~AsyncResolver();
59  virtual void DoWork();
60  virtual void OnWorkDone();
61
62 private:
63  SocketAddress addr_;
64  hostent* result_;
65  int error_;
66};
67
68// SafeGetHostByName functions allocate and return their result, instead of
69// using a static variable like the normal gethostbyname.
70// FreeHostEnt frees the memory allocated by SafeGetHostByName.
71hostent* SafeGetHostByName(const char* hostname, int* herrno);
72void FreeHostEnt(hostent* host);
73
74}  // namespace talk_base
75
76#endif  // TALK_BASE_NETHELPERS_H_
77