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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/dns/host_resolver_nat64_task.h"
#include <algorithm>
#include <utility>
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/location.h"
#include "base/memory/raw_ptr.h"
#include "base/notreached.h"
#include "base/strings/string_util.h"
#include "base/task/sequenced_task_runner.h"
#include "net/base/address_list.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "net/dns/host_resolver.h"
#include "net/dns/host_resolver_manager.h"
#include "net/dns/public/dns_query_type.h"
namespace net {
HostResolverNat64Task::HostResolverNat64Task(
base::StringPiece hostname,
NetworkAnonymizationKey network_anonymization_key,
NetLogWithSource net_log,
ResolveContext* resolve_context,
HostCache* host_cache,
base::WeakPtr<HostResolverManager> resolver)
: hostname_(hostname),
network_anonymization_key_(std::move(network_anonymization_key)),
net_log_(std::move(net_log)),
resolve_context_(resolve_context),
host_cache_(host_cache),
resolver_(std::move(resolver)) {}
HostResolverNat64Task::~HostResolverNat64Task() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
void HostResolverNat64Task::Start(base::OnceClosure completion_closure) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!completion_closure_);
completion_closure_ = std::move(completion_closure);
next_state_ = State::kResolve;
int rv = DoLoop(OK);
if (rv != ERR_IO_PENDING) {
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, std::move(completion_closure_));
}
}
HostCache::Entry HostResolverNat64Task::GetResults() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!completion_closure_);
return results_;
}
int HostResolverNat64Task::DoLoop(int result) {
DCHECK_NE(next_state_, State::kStateNone);
int rv = result;
do {
State state = next_state_;
next_state_ = State::kStateNone;
switch (state) {
case State::kResolve:
DCHECK_EQ(OK, rv);
rv = DoResolve();
break;
case State::kResolveComplete:
rv = DoResolveComplete(rv);
break;
case State::kSynthesizeToIpv6:
DCHECK_EQ(OK, rv);
rv = DoSynthesizeToIpv6();
break;
default:
NOTREACHED();
rv = ERR_FAILED;
break;
}
} while (rv != ERR_IO_PENDING && next_state_ != State::kStateNone);
return rv;
}
int HostResolverNat64Task::DoResolve() {
next_state_ = State::kResolveComplete;
HostResolver::ResolveHostParameters parameters;
parameters.dns_query_type = DnsQueryType::AAAA;
if (!resolver_) {
return ERR_FAILED;
}
request_ipv4onlyarpa_ = resolver_->CreateRequest(
HostPortPair("ipv4only.arpa", 80), network_anonymization_key_, net_log_,
parameters, resolve_context_, host_cache_);
return request_ipv4onlyarpa_->Start(base::BindOnce(
&HostResolverNat64Task::OnIOComplete, weak_ptr_factory_.GetWeakPtr()));
}
int HostResolverNat64Task::DoResolveComplete(int result) {
// If not under DNS64 and resolving ipv4only.arpa fails, return the original
// IPv4 address.
if (result != OK || request_ipv4onlyarpa_->GetEndpointResults()->empty()) {
IPAddress ipv4_address;
bool is_ip = ipv4_address.AssignFromIPLiteral(hostname_);
DCHECK(is_ip);
std::set<std::string> aliases;
results_ =
HostCache::Entry(OK, {IPEndPoint(ipv4_address, 0)}, std::move(aliases),
HostCache::Entry::SOURCE_UNKNOWN);
return OK;
}
next_state_ = State::kSynthesizeToIpv6;
return OK;
}
int HostResolverNat64Task::DoSynthesizeToIpv6() {
IPAddress ipv4_address;
bool is_ip = ipv4_address.AssignFromIPLiteral(hostname_);
DCHECK(is_ip);
IPAddress ipv4onlyarpa_AAAA_address;
std::vector<IPEndPoint> converted_addresses;
for (const auto& endpoints : *request_ipv4onlyarpa_->GetEndpointResults()) {
for (const auto& ip_endpoint : endpoints.ip_endpoints) {
ipv4onlyarpa_AAAA_address = ip_endpoint.address();
Dns64PrefixLength pref64_length =
ExtractPref64FromIpv4onlyArpaAAAA(ipv4onlyarpa_AAAA_address);
IPAddress converted_address = ConvertIPv4ToIPv4EmbeddedIPv6(
ipv4_address, ipv4onlyarpa_AAAA_address, pref64_length);
IPEndPoint converted_ip_endpoint(converted_address, 0);
if (!base::Contains(converted_addresses, converted_ip_endpoint)) {
converted_addresses.push_back(std::move(converted_ip_endpoint));
}
}
}
std::set<std::string> aliases;
if (converted_addresses.empty()) {
converted_addresses = {IPEndPoint(ipv4_address, 0)};
}
results_ = HostCache::Entry(OK, converted_addresses, std::move(aliases),
HostCache::Entry::SOURCE_UNKNOWN);
return OK;
}
void HostResolverNat64Task::OnIOComplete(int result) {
result = DoLoop(result);
if (result != ERR_IO_PENDING)
std::move(completion_closure_).Run();
}
} // namespace net
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