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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 void AsyncResolver::Start(const SocketAddress& addr) {
     64   addr_ = addr;
     65   // SignalThred Start will kickoff the resolve process.
     66   SignalThread::Start();
     67 }
     68 
     69 bool AsyncResolver::GetResolvedAddress(int family, SocketAddress* addr) const {
     70   if (error_ != 0 || addresses_.empty())
     71     return false;
     72 
     73   *addr = addr_;
     74   for (size_t i = 0; i < addresses_.size(); ++i) {
     75     if (family == addresses_[i].family()) {
     76       addr->SetResolvedIP(addresses_[i]);
     77       return true;
     78     }
     79   }
     80   return false;
     81 }
     82 
     83 void AsyncResolver::DoWork() {
     84   error_ = ResolveHostname(addr_.hostname().c_str(), addr_.family(),
     85                            &addresses_);
     86 }
     87 
     88 void AsyncResolver::OnWorkDone() {
     89   SignalDone(this);
     90 }
     91 
     92 const char* inet_ntop(int af, const void *src, char* dst, socklen_t size) {
     93 #if defined(WEBRTC_WIN)
     94   return win32_inet_ntop(af, src, dst, size);
     95 #else
     96   return ::inet_ntop(af, src, dst, size);
     97 #endif
     98 }
     99 
    100 int inet_pton(int af, const char* src, void *dst) {
    101 #if defined(WEBRTC_WIN)
    102   return win32_inet_pton(af, src, dst);
    103 #else
    104   return ::inet_pton(af, src, dst);
    105 #endif
    106 }
    107 
    108 bool HasIPv6Enabled() {
    109 #if !defined(WEBRTC_WIN)
    110   // We only need to check this for Windows XP (so far).
    111   return true;
    112 #else
    113   if (IsWindowsVistaOrLater()) {
    114     return true;
    115   }
    116   if (!IsWindowsXpOrLater()) {
    117     return false;
    118   }
    119   DWORD protbuff_size = 4096;
    120   scoped_ptr<char[]> protocols;
    121   LPWSAPROTOCOL_INFOW protocol_infos = NULL;
    122   int requested_protocols[2] = {AF_INET6, 0};
    123 
    124   int err = 0;
    125   int ret = 0;
    126   // Check for protocols in a do-while loop until we provide a buffer large
    127   // enough. (WSCEnumProtocols sets protbuff_size to its desired value).
    128   // It is extremely unlikely that this will loop more than once.
    129   do {
    130     protocols.reset(new char[protbuff_size]);
    131     protocol_infos = reinterpret_cast<LPWSAPROTOCOL_INFOW>(protocols.get());
    132     ret = WSCEnumProtocols(requested_protocols, protocol_infos,
    133                            &protbuff_size, &err);
    134   } while (ret == SOCKET_ERROR && err == WSAENOBUFS);
    135 
    136   if (ret == SOCKET_ERROR) {
    137     return false;
    138   }
    139 
    140   // Even if ret is positive, check specifically for IPv6.
    141   // Non-IPv6 enabled WinXP will still return a RAW protocol.
    142   for (int i = 0; i < ret; ++i) {
    143     if (protocol_infos[i].iAddressFamily == AF_INET6) {
    144       return true;
    145     }
    146   }
    147   return false;
    148 #endif
    149 }
    150 }  // namespace rtc
    151