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// Copyright (c) 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/dns/address_info.h"
#include "base/logging.h"
#include "base/notreached.h"
#include "base/sys_byteorder.h"
#include "net/base/address_list.h"
#include "net/base/net_errors.h"
#include "net/base/sys_addrinfo.h"
namespace net {
namespace {
const addrinfo* Next(const addrinfo* ai) {
return ai->ai_next;
}
} // namespace
//// iterator
AddressInfo::const_iterator::const_iterator(const addrinfo* ai) : ai_(ai) {}
bool AddressInfo::const_iterator::operator!=(
const AddressInfo::const_iterator& o) const {
return ai_ != o.ai_;
}
AddressInfo::const_iterator& AddressInfo::const_iterator::operator++() {
ai_ = Next(ai_);
return *this;
}
const addrinfo* AddressInfo::const_iterator::operator->() const {
return ai_;
}
const addrinfo& AddressInfo::const_iterator::operator*() const {
return *ai_;
}
//// constructors
AddressInfo::AddressInfoAndResult AddressInfo::Get(
const std::string& host,
const addrinfo& hints,
std::unique_ptr<AddrInfoGetter> getter) {
if (getter == nullptr)
getter = std::make_unique<AddrInfoGetter>();
int err = OK;
int os_error = 0;
addrinfo* ai = getter->getaddrinfo(host, &hints, &os_error);
if (!ai) {
err = ERR_NAME_NOT_RESOLVED;
// If the call to getaddrinfo() failed because of a system error, report
// it separately from ERR_NAME_NOT_RESOLVED.
#if defined(OS_WIN)
if (os_error != WSAHOST_NOT_FOUND && os_error != WSANO_DATA)
err = ERR_NAME_RESOLUTION_FAILED;
#elif defined(OS_ANDROID)
// Workaround for Android's getaddrinfo leaving ai==nullptr without an
// error.
// http://crbug.com/134142
err = ERR_NAME_NOT_RESOLVED;
#elif defined(OS_POSIX) && !defined(OS_FREEBSD)
if (os_error != EAI_NONAME && os_error != EAI_NODATA)
err = ERR_NAME_RESOLUTION_FAILED;
#endif
return AddressInfoAndResult(base::Optional<AddressInfo>(), err, os_error);
}
return AddressInfoAndResult(
base::Optional<AddressInfo>(AddressInfo(ai, std::move(getter))), OK, 0);
}
AddressInfo::AddressInfo(AddressInfo&& other)
: ai_(other.ai_), getter_(std::move(other.getter_)) {
other.ai_ = nullptr;
}
AddressInfo& AddressInfo::operator=(AddressInfo&& other) {
ai_ = other.ai_;
other.ai_ = nullptr;
getter_ = std::move(other.getter_);
return *this;
}
AddressInfo::~AddressInfo() {
if (ai_)
getter_->freeaddrinfo(ai_);
}
//// public methods
AddressInfo::const_iterator AddressInfo::begin() const {
return const_iterator(ai_);
}
AddressInfo::const_iterator AddressInfo::end() const {
return const_iterator(nullptr);
}
base::Optional<std::string> AddressInfo::GetCanonicalName() const {
return (ai_->ai_canonname != nullptr)
? base::Optional<std::string>(std::string(ai_->ai_canonname))
: base::Optional<std::string>();
}
bool AddressInfo::IsAllLocalhostOfOneFamily() const {
bool saw_v4_localhost = false;
bool saw_v6_localhost = false;
const auto* ai = ai_;
for (; ai != nullptr; ai = Next(ai)) {
switch (ai->ai_family) {
case AF_INET: {
const struct sockaddr_in* addr_in =
reinterpret_cast<struct sockaddr_in*>(ai->ai_addr);
if ((base::NetToHost32(addr_in->sin_addr.s_addr) & 0xff000000) ==
0x7f000000)
saw_v4_localhost = true;
else
return false;
break;
}
case AF_INET6: {
const struct sockaddr_in6* addr_in6 =
reinterpret_cast<struct sockaddr_in6*>(ai->ai_addr);
if (IN6_IS_ADDR_LOOPBACK(&addr_in6->sin6_addr))
saw_v6_localhost = true;
else
return false;
break;
}
default:
NOTREACHED();
return false;
}
}
return saw_v4_localhost != saw_v6_localhost;
}
AddressList AddressInfo::CreateAddressList() const {
AddressList list;
auto canonical_name = GetCanonicalName();
if (canonical_name)
list.set_canonical_name(*canonical_name);
for (auto&& ai : *this) {
IPEndPoint ipe;
// NOTE: Ignoring non-INET* families.
if (ipe.FromSockAddr(ai.ai_addr, ai.ai_addrlen))
list.push_back(ipe);
else
DLOG(WARNING) << "Unknown family found in addrinfo: " << ai.ai_family;
}
return list;
}
//// private methods
AddressInfo::AddressInfo(addrinfo* ai, std::unique_ptr<AddrInfoGetter> getter)
: ai_(ai), getter_(std::move(getter)) {}
//// AddrInfoGetter
AddrInfoGetter::AddrInfoGetter() = default;
AddrInfoGetter::~AddrInfoGetter() = default;
addrinfo* AddrInfoGetter::getaddrinfo(const std::string& host,
const addrinfo* hints,
int* out_os_error) {
addrinfo* ai;
*out_os_error = ::getaddrinfo(host.c_str(), nullptr, hints, &ai);
if (*out_os_error) {
#if defined(OS_WIN)
*out_os_error = WSAGetLastError();
#endif
return nullptr;
}
return ai;
}
void AddrInfoGetter::freeaddrinfo(addrinfo* ai) {
::freeaddrinfo(ai);
}
} // namespace net
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