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/*
* Copyright 2008 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/nethelpers.h"
#include <memory>
#if defined(WEBRTC_WIN)
#include <ws2spi.h>
#include <ws2tcpip.h>
#include "rtc_base/win32.h"
#endif
#if defined(WEBRTC_POSIX) && !defined(__native_client__)
#if defined(WEBRTC_ANDROID)
#include "rtc_base/ifaddrs-android.h"
#else
#include <ifaddrs.h>
#endif
#endif // defined(WEBRTC_POSIX) && !defined(__native_client__)
#include "rtc_base/byteorder.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/signalthread.h"
namespace rtc {
int ResolveHostname(const std::string& hostname, int family,
std::vector<IPAddress>* addresses) {
#ifdef __native_client__
RTC_NOTREACHED();
RTC_LOG(LS_WARNING) << "ResolveHostname() is not implemented for NaCl";
return -1;
#else // __native_client__
if (!addresses) {
return -1;
}
addresses->clear();
struct addrinfo* result = nullptr;
struct addrinfo hints = {0};
hints.ai_family = family;
// |family| here will almost always be AF_UNSPEC, because |family| comes from
// AsyncResolver::addr_.family(), which comes from a SocketAddress constructed
// with a hostname. When a SocketAddress is constructed with a hostname, its
// family is AF_UNSPEC. However, if someday in the future we construct
// a SocketAddress with both a hostname and a family other than AF_UNSPEC,
// then it would be possible to get a specific family value here.
// The behavior of AF_UNSPEC is roughly "get both ipv4 and ipv6", as
// documented by the various operating systems:
// Linux: http://man7.org/linux/man-pages/man3/getaddrinfo.3.html
// Windows: https://msdn.microsoft.com/en-us/library/windows/desktop/
// ms738520(v=vs.85).aspx
// Mac: https://developer.apple.com/legacy/library/documentation/Darwin/
// Reference/ManPages/man3/getaddrinfo.3.html
// Android (source code, not documentation):
// https://android.googlesource.com/platform/bionic/+/
// 7e0bfb511e85834d7c6cb9631206b62f82701d60/libc/netbsd/net/getaddrinfo.c#1657
hints.ai_flags = AI_ADDRCONFIG;
int ret = getaddrinfo(hostname.c_str(), nullptr, &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()
: SignalThread(false /* use_socket_server */), error_(-1) {}
AsyncResolver::~AsyncResolver() = default;
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;
}
int AsyncResolver::GetError() const {
return error_;
}
void AsyncResolver::Destroy(bool wait) {
SignalThread::Destroy(wait);
}
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) {
#if defined(WEBRTC_WIN)
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) {
#if defined(WEBRTC_WIN)
return win32_inet_pton(af, src, dst);
#else
return ::inet_pton(af, src, dst);
#endif
}
bool HasIPv4Enabled() {
#if defined(WEBRTC_POSIX) && !defined(__native_client__)
bool has_ipv4 = false;
struct ifaddrs* ifa;
if (getifaddrs(&ifa) < 0) {
return false;
}
for (struct ifaddrs* cur = ifa; cur != nullptr; cur = cur->ifa_next) {
if (cur->ifa_addr->sa_family == AF_INET) {
has_ipv4 = true;
break;
}
}
freeifaddrs(ifa);
return has_ipv4;
#else
return true;
#endif
}
bool HasIPv6Enabled() {
#if defined(WEBRTC_WIN)
if (IsWindowsVistaOrLater()) {
return true;
}
if (!IsWindowsXpOrLater()) {
return false;
}
DWORD protbuff_size = 4096;
std::unique_ptr<char[]> protocols;
LPWSAPROTOCOL_INFOW protocol_infos = nullptr;
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;
#elif defined(WEBRTC_POSIX) && !defined(__native_client__)
bool has_ipv6 = false;
struct ifaddrs* ifa;
if (getifaddrs(&ifa) < 0) {
return false;
}
for (struct ifaddrs* cur = ifa; cur != nullptr; cur = cur->ifa_next) {
if (cur->ifa_addr->sa_family == AF_INET6) {
has_ipv6 = true;
break;
}
}
freeifaddrs(ifa);
return has_ipv6;
#else
return true;
#endif
}
} // namespace rtc
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