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// Copyright 2012 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/mapped_host_resolver.h"
#include <optional>
#include <string>
#include <utility>
#include "base/strings/string_util.h"
#include "base/values.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_errors.h"
#include "net/base/network_anonymization_key.h"
#include "net/base/url_util.h"
#include "net/dns/host_resolver.h"
#include "net/log/net_log_with_source.h"
#include "url/gurl.h"
#include "url/scheme_host_port.h"
#include "url/url_canon.h"
namespace net {
MappedHostResolver::MappedHostResolver(std::unique_ptr<HostResolver> impl)
: impl_(std::move(impl)) {}
MappedHostResolver::~MappedHostResolver() = default;
void MappedHostResolver::OnShutdown() {
impl_->OnShutdown();
}
std::unique_ptr<HostResolver::ResolveHostRequest>
MappedHostResolver::CreateRequest(
url::SchemeHostPort host,
NetworkAnonymizationKey network_anonymization_key,
NetLogWithSource source_net_log,
std::optional<ResolveHostParameters> optional_parameters) {
GURL rewritten_url = host.GetURL();
HostMappingRules::RewriteResult result = rules_.RewriteUrl(rewritten_url);
switch (result) {
case HostMappingRules::RewriteResult::kRewritten:
DCHECK(rewritten_url.is_valid());
DCHECK_NE(rewritten_url.host_piece(), "^NOTFOUND");
return impl_->CreateRequest(url::SchemeHostPort(rewritten_url),
std::move(network_anonymization_key),
std::move(source_net_log),
std::move(optional_parameters));
case HostMappingRules::RewriteResult::kInvalidRewrite:
// Treat any invalid mapping as if it was "^NOTFOUND" (which should itself
// result in `kInvalidRewrite`).
return CreateFailingRequest(ERR_NAME_NOT_RESOLVED);
case HostMappingRules::RewriteResult::kNoMatchingRule:
return impl_->CreateRequest(
std::move(host), std::move(network_anonymization_key),
std::move(source_net_log), std::move(optional_parameters));
}
}
std::unique_ptr<HostResolver::ResolveHostRequest>
MappedHostResolver::CreateRequest(
const HostPortPair& host,
const NetworkAnonymizationKey& network_anonymization_key,
const NetLogWithSource& source_net_log,
const std::optional<ResolveHostParameters>& optional_parameters) {
HostPortPair rewritten = host;
rules_.RewriteHost(&rewritten);
if (rewritten.host() == "^NOTFOUND") {
return CreateFailingRequest(ERR_NAME_NOT_RESOLVED);
}
return impl_->CreateRequest(rewritten, network_anonymization_key,
source_net_log, optional_parameters);
}
std::unique_ptr<HostResolver::ServiceEndpointRequest>
MappedHostResolver::CreateServiceEndpointRequest(
Host host,
NetworkAnonymizationKey network_anonymization_key,
NetLogWithSource net_log,
ResolveHostParameters parameters) {
// All call sites of this function should have a valid scheme.
CHECK(host.HasScheme());
GURL rewritten_url = host.AsSchemeHostPort().GetURL();
HostMappingRules::RewriteResult result = rules_.RewriteUrl(rewritten_url);
switch (result) {
case HostMappingRules::RewriteResult::kRewritten:
DCHECK(rewritten_url.is_valid());
DCHECK_NE(rewritten_url.host_piece(), "^NOTFOUND");
return impl_->CreateServiceEndpointRequest(
Host(url::SchemeHostPort(rewritten_url)),
std::move(network_anonymization_key), std::move(net_log),
std::move(parameters));
case HostMappingRules::RewriteResult::kInvalidRewrite:
// Treat any invalid mapping as if it was "^NOTFOUND" (which should itself
// result in `kInvalidRewrite`).
return CreateFailingServiceEndpointRequest(ERR_NAME_NOT_RESOLVED);
case HostMappingRules::RewriteResult::kNoMatchingRule:
return impl_->CreateServiceEndpointRequest(
std::move(host), std::move(network_anonymization_key),
std::move(net_log), std::move(parameters));
}
}
std::unique_ptr<HostResolver::ProbeRequest>
MappedHostResolver::CreateDohProbeRequest() {
return impl_->CreateDohProbeRequest();
}
HostCache* MappedHostResolver::GetHostCache() {
return impl_->GetHostCache();
}
base::Value::Dict MappedHostResolver::GetDnsConfigAsValue() const {
return impl_->GetDnsConfigAsValue();
}
void MappedHostResolver::SetRequestContext(URLRequestContext* request_context) {
impl_->SetRequestContext(request_context);
}
bool MappedHostResolver::IsHappyEyeballsV3Enabled() const {
return impl_->IsHappyEyeballsV3Enabled();
}
HostResolverManager* MappedHostResolver::GetManagerForTesting() {
return impl_->GetManagerForTesting();
}
} // namespace net
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