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 address()52 const SocketAddress& address() const { return addr_; } set_address(const SocketAddress & addr)53 void set_address(const SocketAddress& addr) { addr_ = addr; } error()54 int error() const { return error_; } set_error(int 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. 71 hostent* SafeGetHostByName(const char* hostname, int* herrno); 72 void FreeHostEnt(hostent* host); 73 74 } // namespace talk_base 75 76 #endif // TALK_BASE_NETHELPERS_H_ 77