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
ResolveHostname(const std::string & hostname,int family,std::vector<IPAddress> * addresses)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
AsyncResolver()60 AsyncResolver::AsyncResolver() : error_(-1) {
61 }
62
Start(const SocketAddress & addr)63 void AsyncResolver::Start(const SocketAddress& addr) {
64 addr_ = addr;
65 // SignalThred Start will kickoff the resolve process.
66 SignalThread::Start();
67 }
68
GetResolvedAddress(int family,SocketAddress * addr) const69 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
DoWork()83 void AsyncResolver::DoWork() {
84 error_ = ResolveHostname(addr_.hostname().c_str(), addr_.family(),
85 &addresses_);
86 }
87
OnWorkDone()88 void AsyncResolver::OnWorkDone() {
89 SignalDone(this);
90 }
91
inet_ntop(int af,const void * src,char * dst,socklen_t size)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
inet_pton(int af,const char * src,void * dst)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
HasIPv6Enabled()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