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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "services/network/resolve_host_request.h"
#include <algorithm>
#include <optional>
#include <string>
#include <utility>
#include "base/check_op.h"
#include "base/containers/to_vector.h"
#include "base/functional/bind.h"
#include "base/strings/string_util.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_errors.h"
#include "net/base/url_util.h"
#include "net/log/net_log.h"
#include "net/log/net_log_with_source.h"
#include "url/url_canon.h"
namespace network {
namespace {
// Attempts URL canonicalization, but if unable, leaves `host_port_pair` alone.
void TryToCanonicalizeHost(net::HostPortPair& host_port_pair) {
url::CanonHostInfo info;
std::string canonicalized =
net::CanonicalizeHost(host_port_pair.host(), &info);
if (info.family != url::CanonHostInfo::BROKEN) {
host_port_pair.set_host(canonicalized);
}
}
} // namespace
ResolveHostRequest::ResolveHostRequest(
net::HostResolver* resolver,
mojom::HostResolverHostPtr host,
const net::NetworkAnonymizationKey& network_anonymization_key,
const std::optional<net::HostResolver::ResolveHostParameters>&
optional_parameters,
net::NetLog* net_log) {
DCHECK(resolver);
DCHECK(net_log);
if (host->is_host_port_pair()) {
// net::HostResolver expects canonicalized hostnames.
net::HostPortPair& host_port_pair = host->get_host_port_pair();
TryToCanonicalizeHost(host_port_pair);
internal_request_ = resolver->CreateRequest(
host_port_pair, network_anonymization_key,
net::NetLogWithSource::Make(
net_log, net::NetLogSourceType::NETWORK_SERVICE_HOST_RESOLVER),
optional_parameters);
} else {
internal_request_ = resolver->CreateRequest(
host->get_scheme_host_port(), network_anonymization_key,
net::NetLogWithSource::Make(
net_log, net::NetLogSourceType::NETWORK_SERVICE_HOST_RESOLVER),
optional_parameters);
}
}
ResolveHostRequest::~ResolveHostRequest() {
control_handle_receiver_.reset();
if (response_client_.is_bound()) {
response_client_->OnComplete(net::ERR_NAME_NOT_RESOLVED,
net::ResolveErrorInfo(net::ERR_FAILED),
/*resolved_addresses=*/{},
/*alternative_endpoints=*/{});
response_client_.reset();
}
}
int ResolveHostRequest::Start(
mojo::PendingReceiver<mojom::ResolveHostHandle> control_handle_receiver,
mojo::PendingRemote<mojom::ResolveHostClient> pending_response_client,
net::CompletionOnceCallback callback) {
DCHECK(internal_request_);
DCHECK(!control_handle_receiver_.is_bound());
DCHECK(!response_client_.is_bound());
// Unretained |this| reference is safe because if |internal_request_| goes out
// of scope, it will cancel the request and ResolveHost() will not call the
// callback.
int rv = internal_request_->Start(
base::BindOnce(&ResolveHostRequest::OnComplete, base::Unretained(this)));
mojo::Remote<mojom::ResolveHostClient> response_client(
std::move(pending_response_client));
if (rv != net::ERR_IO_PENDING) {
response_client->OnComplete(rv, GetResolveErrorInfo(), GetAddressResults(),
GetAlternativeEndpoints());
return rv;
}
if (control_handle_receiver)
control_handle_receiver_.Bind(std::move(control_handle_receiver));
response_client_ = std::move(response_client);
// Unretained |this| reference is safe because connection error cannot occur
// if |response_client_| goes out of scope.
response_client_.set_disconnect_handler(base::BindOnce(
&ResolveHostRequest::Cancel, base::Unretained(this), net::ERR_FAILED));
callback_ = std::move(callback);
return net::ERR_IO_PENDING;
}
void ResolveHostRequest::Cancel(int error) {
DCHECK_NE(net::OK, error);
if (cancelled_)
return;
internal_request_ = nullptr;
cancelled_ = true;
resolve_error_info_ = net::ResolveErrorInfo(error);
OnComplete(error);
}
void ResolveHostRequest::OnComplete(int error) {
DCHECK(response_client_.is_bound());
DCHECK(callback_);
control_handle_receiver_.reset();
SignalNonAddressResults();
response_client_->OnComplete(error, GetResolveErrorInfo(),
GetAddressResults(), GetAlternativeEndpoints());
response_client_.reset();
// Invoke completion callback last as it may delete |this|.
std::move(callback_).Run(GetResolveErrorInfo().error);
}
net::ResolveErrorInfo ResolveHostRequest::GetResolveErrorInfo() const {
if (cancelled_) {
return resolve_error_info_;
}
DCHECK(internal_request_);
return internal_request_->GetResolveErrorInfo();
}
net::AddressList ResolveHostRequest::GetAddressResults() const {
if (cancelled_) {
return net::AddressList();
}
DCHECK(internal_request_);
return internal_request_->GetAddressResults();
}
net::HostResolverEndpointResults ResolveHostRequest::GetAlternativeEndpoints()
const {
if (cancelled_) {
return {};
}
DCHECK(internal_request_);
auto endpoints = internal_request_->GetEndpointResults();
// `endpoints` contains both alternative endpoints (from HTTPS/SVCB) and
// authority endpoints (from A/AAAA directly). The authority endpoints are
// redundant with `AddressList`, so return only the alternative endpoints.
//
// TODO(crbug.com/40203587): This is the opposite of the design taken
// everywhere else in the DNS logic, where we aimed to migrate `AddressList`
// to `HostResolverEndpointResult`.
net::HostResolverEndpointResults alternative_endpoints;
std::ranges::copy_if(
endpoints, std::back_inserter(alternative_endpoints),
[](const auto& endpoint) { return endpoint.metadata.IsAlternative(); });
return alternative_endpoints;
}
void ResolveHostRequest::SignalNonAddressResults() {
if (cancelled_) {
return;
}
DCHECK(internal_request_);
if (!internal_request_->GetTextResults().empty()) {
response_client_->OnTextResults(
base::ToVector(internal_request_->GetTextResults()));
}
if (!internal_request_->GetHostnameResults().empty()) {
response_client_->OnHostnameResults(
base::ToVector(internal_request_->GetHostnameResults()));
}
}
} // namespace network
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