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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 #include "talk/base/nethelpers.h"
     29 
     30 #if defined(WIN32)
     31 #include <ws2spi.h>
     32 #include <ws2tcpip.h>
     33 #include "talk/base/win32.h"
     34 #endif
     35 
     36 #include "talk/base/byteorder.h"
     37 #include "talk/base/signalthread.h"
     38 
     39 namespace talk_base {
     40 
     41 int ResolveHostname(const std::string& hostname, int family,
     42                     std::vector<IPAddress>* addresses) {
     43   if (!addresses) {
     44     return -1;
     45   }
     46   addresses->clear();
     47   struct addrinfo* result = NULL;
     48   struct addrinfo hints = {0};
     49   // TODO(djw): For now this is IPv4 only so existing users remain unaffected.
     50   hints.ai_family = AF_INET;
     51   hints.ai_flags = AI_ADDRCONFIG;
     52   int ret = getaddrinfo(hostname.c_str(), NULL, &hints, &result);
     53   if (ret != 0) {
     54     return ret;
     55   }
     56   struct addrinfo* cursor = result;
     57   for (; cursor; cursor = cursor->ai_next) {
     58     if (family == AF_UNSPEC || cursor->ai_family == family) {
     59       IPAddress ip;
     60       if (IPFromAddrInfo(cursor, &ip)) {
     61         addresses->push_back(ip);
     62       }
     63     }
     64   }
     65   freeaddrinfo(result);
     66   return 0;
     67 }
     68 
     69 // AsyncResolver
     70 AsyncResolver::AsyncResolver() : error_(-1) {
     71 }
     72 
     73 void AsyncResolver::Start(const SocketAddress& addr) {
     74   addr_ = addr;
     75   // SignalThred Start will kickoff the resolve process.
     76   SignalThread::Start();
     77 }
     78 
     79 bool AsyncResolver::GetResolvedAddress(int family, SocketAddress* addr) const {
     80   if (error_ != 0 || addresses_.empty())
     81     return false;
     82 
     83   *addr = addr_;
     84   for (size_t i = 0; i < addresses_.size(); ++i) {
     85     if (family == addresses_[i].family()) {
     86       addr->SetIP(addresses_[i]);
     87       return true;
     88     }
     89   }
     90   return false;
     91 }
     92 
     93 void AsyncResolver::DoWork() {
     94   error_ = ResolveHostname(addr_.hostname().c_str(), addr_.family(),
     95                            &addresses_);
     96 }
     97 
     98 void AsyncResolver::OnWorkDone() {
     99   SignalDone(this);
    100 }
    101 
    102 const char* inet_ntop(int af, const void *src, char* dst, socklen_t size) {
    103 #ifdef WIN32
    104   return win32_inet_ntop(af, src, dst, size);
    105 #else
    106   return ::inet_ntop(af, src, dst, size);
    107 #endif
    108 }
    109 
    110 int inet_pton(int af, const char* src, void *dst) {
    111 #ifdef WIN32
    112   return win32_inet_pton(af, src, dst);
    113 #else
    114   return ::inet_pton(af, src, dst);
    115 #endif
    116 }
    117 
    118 bool HasIPv6Enabled() {
    119 #ifndef WIN32
    120   // We only need to check this for Windows XP (so far).
    121   return true;
    122 #else
    123   if (IsWindowsVistaOrLater()) {
    124     return true;
    125   }
    126   if (!IsWindowsXpOrLater()) {
    127     return false;
    128   }
    129   DWORD protbuff_size = 4096;
    130   scoped_ptr<char[]> protocols;
    131   LPWSAPROTOCOL_INFOW protocol_infos = NULL;
    132   int requested_protocols[2] = {AF_INET6, 0};
    133 
    134   int err = 0;
    135   int ret = 0;
    136   // Check for protocols in a do-while loop until we provide a buffer large
    137   // enough. (WSCEnumProtocols sets protbuff_size to its desired value).
    138   // It is extremely unlikely that this will loop more than once.
    139   do {
    140     protocols.reset(new char[protbuff_size]);
    141     protocol_infos = reinterpret_cast<LPWSAPROTOCOL_INFOW>(protocols.get());
    142     ret = WSCEnumProtocols(requested_protocols, protocol_infos,
    143                            &protbuff_size, &err);
    144   } while (ret == SOCKET_ERROR && err == WSAENOBUFS);
    145 
    146   if (ret == SOCKET_ERROR) {
    147     return false;
    148   }
    149 
    150   // Even if ret is positive, check specifically for IPv6.
    151   // Non-IPv6 enabled WinXP will still return a RAW protocol.
    152   for (int i = 0; i < ret; ++i) {
    153     if (protocol_infos[i].iAddressFamily == AF_INET6) {
    154       return true;
    155     }
    156   }
    157   return false;
    158 #endif
    159 }
    160 }  // namespace talk_base
    161