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      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 
     44 namespace talk_base {
     45 
     46 // AsyncResolver will perform async DNS resolution, signaling the result on
     47 // the inherited SignalWorkDone when the operation completes.
     48 class AsyncResolver : public SignalThread {
     49  public:
     50   AsyncResolver();
     51 
     52   const SocketAddress& address() const { return addr_; }
     53   const std::vector<IPAddress>& addresses() const { return addresses_; }
     54   void set_address(const SocketAddress& addr) { addr_ = addr; }
     55   int error() const { return error_; }
     56   void set_error(int error) { error_ = error; }
     57 
     58 
     59  protected:
     60   virtual void DoWork();
     61   virtual void OnWorkDone();
     62 
     63  private:
     64   SocketAddress addr_;
     65   std::vector<IPAddress> addresses_;
     66   int error_;
     67 };
     68 
     69 // talk_base namespaced wrappers for inet_ntop and inet_pton so we can avoid
     70 // the windows-native versions of these.
     71 const char* inet_ntop(int af, const void *src, char* dst, socklen_t size);
     72 int inet_pton(int af, const char* src, void *dst);
     73 
     74 bool HasIPv6Enabled();
     75 }  // namespace talk_base
     76 
     77 #endif  // TALK_BASE_NETHELPERS_H_
     78