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/*
* libjingle
* Copyright 2008, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/base/nethelpers.h"
#if defined(WIN32)
#include <ws2spi.h>
#include <ws2tcpip.h>
#include "talk/base/win32.h"
#endif
#include "talk/base/byteorder.h"
#include "talk/base/logging.h"
#include "talk/base/signalthread.h"
namespace talk_base {
int ResolveHostname(const std::string& hostname, int family,
std::vector<IPAddress>* addresses) {
#ifdef __native_client__
ASSERT(false);
LOG(LS_WARNING) << "ResolveHostname() is not implemented for NaCl";
return -1;
#else // __native_client__
if (!addresses) {
return -1;
}
addresses->clear();
struct addrinfo* result = NULL;
struct addrinfo hints = {0};
// TODO(djw): For now this is IPv4 only so existing users remain unaffected.
hints.ai_family = AF_INET;
hints.ai_flags = AI_ADDRCONFIG;
int ret = getaddrinfo(hostname.c_str(), NULL, &hints, &result);
if (ret != 0) {
return ret;
}
struct addrinfo* cursor = result;
for (; cursor; cursor = cursor->ai_next) {
if (family == AF_UNSPEC || cursor->ai_family == family) {
IPAddress ip;
if (IPFromAddrInfo(cursor, &ip)) {
addresses->push_back(ip);
}
}
}
freeaddrinfo(result);
return 0;
#endif // !__native_client__
}
// AsyncResolver
AsyncResolver::AsyncResolver() : error_(-1) {
}
void AsyncResolver::Start(const SocketAddress& addr) {
addr_ = addr;
// SignalThred Start will kickoff the resolve process.
SignalThread::Start();
}
bool AsyncResolver::GetResolvedAddress(int family, SocketAddress* addr) const {
if (error_ != 0 || addresses_.empty())
return false;
*addr = addr_;
for (size_t i = 0; i < addresses_.size(); ++i) {
if (family == addresses_[i].family()) {
addr->SetResolvedIP(addresses_[i]);
return true;
}
}
return false;
}
void AsyncResolver::DoWork() {
error_ = ResolveHostname(addr_.hostname().c_str(), addr_.family(),
&addresses_);
}
void AsyncResolver::OnWorkDone() {
SignalDone(this);
}
const char* inet_ntop(int af, const void *src, char* dst, socklen_t size) {
#ifdef WIN32
return win32_inet_ntop(af, src, dst, size);
#else
return ::inet_ntop(af, src, dst, size);
#endif
}
int inet_pton(int af, const char* src, void *dst) {
#ifdef WIN32
return win32_inet_pton(af, src, dst);
#else
return ::inet_pton(af, src, dst);
#endif
}
bool HasIPv6Enabled() {
#ifndef WIN32
// We only need to check this for Windows XP (so far).
return true;
#else
if (IsWindowsVistaOrLater()) {
return true;
}
if (!IsWindowsXpOrLater()) {
return false;
}
DWORD protbuff_size = 4096;
scoped_ptr<char[]> protocols;
LPWSAPROTOCOL_INFOW protocol_infos = NULL;
int requested_protocols[2] = {AF_INET6, 0};
int err = 0;
int ret = 0;
// Check for protocols in a do-while loop until we provide a buffer large
// enough. (WSCEnumProtocols sets protbuff_size to its desired value).
// It is extremely unlikely that this will loop more than once.
do {
protocols.reset(new char[protbuff_size]);
protocol_infos = reinterpret_cast<LPWSAPROTOCOL_INFOW>(protocols.get());
ret = WSCEnumProtocols(requested_protocols, protocol_infos,
&protbuff_size, &err);
} while (ret == SOCKET_ERROR && err == WSAENOBUFS);
if (ret == SOCKET_ERROR) {
return false;
}
// Even if ret is positive, check specifically for IPv6.
// Non-IPv6 enabled WinXP will still return a RAW protocol.
for (int i = 0; i < ret; ++i) {
if (protocol_infos[i].iAddressFamily == AF_INET6) {
return true;
}
}
return false;
#endif
}
} // namespace talk_base
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