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      1 /*
      2  *  Copyright 2008 The WebRTC Project Authors. All rights reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #include "webrtc/base/nethelpers.h"
     12 
     13 #if defined(WEBRTC_WIN)
     14 #include <ws2spi.h>
     15 #include <ws2tcpip.h>
     16 #include "webrtc/base/win32.h"
     17 #endif
     18 
     19 #include "webrtc/base/byteorder.h"
     20 #include "webrtc/base/logging.h"
     21 #include "webrtc/base/signalthread.h"
     22 
     23 namespace rtc {
     24 
     25 int ResolveHostname(const std::string& hostname, int family,
     26                     std::vector<IPAddress>* addresses) {
     27 #ifdef __native_client__
     28   ASSERT(false);
     29   LOG(LS_WARNING) << "ResolveHostname() is not implemented for NaCl";
     30   return -1;
     31 #else  // __native_client__
     32   if (!addresses) {
     33     return -1;
     34   }
     35   addresses->clear();
     36   struct addrinfo* result = NULL;
     37   struct addrinfo hints = {0};
     38   // TODO(djw): For now this is IPv4 only so existing users remain unaffected.
     39   hints.ai_family = AF_INET;
     40   hints.ai_flags = AI_ADDRCONFIG;
     41   int ret = getaddrinfo(hostname.c_str(), NULL, &hints, &result);
     42   if (ret != 0) {
     43     return ret;
     44   }
     45   struct addrinfo* cursor = result;
     46   for (; cursor; cursor = cursor->ai_next) {
     47     if (family == AF_UNSPEC || cursor->ai_family == family) {
     48       IPAddress ip;
     49       if (IPFromAddrInfo(cursor, &ip)) {
     50         addresses->push_back(ip);
     51       }
     52     }
     53   }
     54   freeaddrinfo(result);
     55   return 0;
     56 #endif  // !__native_client__
     57 }
     58 
     59 // AsyncResolver
     60 AsyncResolver::AsyncResolver() : error_(-1) {
     61 }
     62 
     63 AsyncResolver::~AsyncResolver() = default;
     64 
     65 void AsyncResolver::Start(const SocketAddress& addr) {
     66   addr_ = addr;
     67   // SignalThred Start will kickoff the resolve process.
     68   SignalThread::Start();
     69 }
     70 
     71 bool AsyncResolver::GetResolvedAddress(int family, SocketAddress* addr) const {
     72   if (error_ != 0 || addresses_.empty())
     73     return false;
     74 
     75   *addr = addr_;
     76   for (size_t i = 0; i < addresses_.size(); ++i) {
     77     if (family == addresses_[i].family()) {
     78       addr->SetResolvedIP(addresses_[i]);
     79       return true;
     80     }
     81   }
     82   return false;
     83 }
     84 
     85 int AsyncResolver::GetError() const {
     86   return error_;
     87 }
     88 
     89 void AsyncResolver::Destroy(bool wait) {
     90   SignalThread::Destroy(wait);
     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 #if defined(WEBRTC_WIN)
    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 #if defined(WEBRTC_WIN)
    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 #if !defined(WEBRTC_WIN)
    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 rtc
    161