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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/host_resolver.h"
#include <optional>
#include <utility>
#include "base/functional/bind.h"
#include "base/no_destructor.h"
#include "base/task/sequenced_task_runner.h"
#include "build/build_config.h"
#include "mojo/public/cpp/bindings/enum_traits.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_errors.h"
#include "net/dns/host_resolver.h"
#include "net/dns/public/host_resolver_source.h"
#include "net/dns/public/secure_dns_policy.h"
#include "net/log/net_log.h"
#include "net/net_buildflags.h"
#include "services/network/host_resolver_mdns_listener.h"
#include "services/network/public/cpp/host_resolver_mojom_traits.h"
#include "services/network/public/mojom/host_resolver.mojom.h"
#include "services/network/resolve_host_request.h"
namespace network {
namespace {
HostResolver::ResolveHostCallback& GetResolveHostCallback() {
static base::NoDestructor<HostResolver::ResolveHostCallback> callback;
return *callback;
}
std::optional<net::HostResolver::ResolveHostParameters>
ConvertOptionalParameters(
const mojom::ResolveHostParametersPtr& mojo_parameters) {
if (!mojo_parameters)
return std::nullopt;
net::HostResolver::ResolveHostParameters parameters;
parameters.dns_query_type = mojo_parameters->dns_query_type;
parameters.initial_priority = mojo_parameters->initial_priority;
parameters.source = mojo_parameters->source;
switch (mojo_parameters->cache_usage) {
case mojom::ResolveHostParameters::CacheUsage::ALLOWED:
parameters.cache_usage =
net::HostResolver::ResolveHostParameters::CacheUsage::ALLOWED;
break;
case mojom::ResolveHostParameters::CacheUsage::STALE_ALLOWED:
parameters.cache_usage =
net::HostResolver::ResolveHostParameters::CacheUsage::STALE_ALLOWED;
break;
case mojom::ResolveHostParameters::CacheUsage::DISALLOWED:
parameters.cache_usage =
net::HostResolver::ResolveHostParameters::CacheUsage::DISALLOWED;
break;
}
parameters.include_canonical_name = mojo_parameters->include_canonical_name;
parameters.loopback_only = mojo_parameters->loopback_only;
parameters.is_speculative = mojo_parameters->is_speculative;
mojo::EnumTraits<mojom::SecureDnsPolicy, net::SecureDnsPolicy>::FromMojom(
mojo_parameters->secure_dns_policy, ¶meters.secure_dns_policy);
return parameters;
}
} // namespace
HostResolver::HostResolver(
mojo::PendingReceiver<mojom::HostResolver> resolver_receiver,
ConnectionShutdownCallback connection_shutdown_callback,
net::HostResolver* internal_resolver,
std::unique_ptr<net::HostResolver> owned_internal_resolver,
net::NetLog* net_log)
: receiver_(this),
pending_receiver_(std::move(resolver_receiver)),
connection_shutdown_callback_(std::move(connection_shutdown_callback)),
owned_internal_resolver_(std::move(owned_internal_resolver)),
internal_resolver_(internal_resolver),
net_log_(net_log) {
DCHECK(!owned_internal_resolver_ ||
internal_resolver_ == owned_internal_resolver_.get());
// Bind the pending receiver asynchronously to give the resolver a chance
// to set up (some resolvers need to obtain the system config asynchronously).
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(&HostResolver::AsyncSetUp, weak_factory_.GetWeakPtr()));
}
HostResolver::HostResolver(net::HostResolver* internal_resolver,
net::NetLog* net_log)
: receiver_(this),
internal_resolver_(internal_resolver),
net_log_(net_log) {}
HostResolver::~HostResolver() {
receiver_.reset();
}
void HostResolver::ResolveHost(
mojom::HostResolverHostPtr host,
const net::NetworkAnonymizationKey& network_anonymization_key,
mojom::ResolveHostParametersPtr optional_parameters,
mojo::PendingRemote<mojom::ResolveHostClient> response_client) {
#if !BUILDFLAG(ENABLE_MDNS)
// TODO(crbug.com/41375980): Handle without crashing if we create restricted
// HostResolvers for passing to untrusted processes.
DCHECK(!optional_parameters ||
optional_parameters->source != net::HostResolverSource::MULTICAST_DNS);
#endif // !BUILDFLAG(ENABLE_MDNS)
if (!GetResolveHostCallback().is_null()) {
GetResolveHostCallback().Run(host->is_host_port_pair()
? host->get_host_port_pair().host()
: host->get_scheme_host_port().host());
}
auto request = std::make_unique<ResolveHostRequest>(
internal_resolver_, std::move(host), network_anonymization_key,
ConvertOptionalParameters(optional_parameters), net_log_);
mojo::PendingReceiver<mojom::ResolveHostHandle> control_handle_receiver;
if (optional_parameters)
control_handle_receiver = std::move(optional_parameters->control_handle);
int rv = request->Start(
std::move(control_handle_receiver), std::move(response_client),
base::BindOnce(&HostResolver::OnResolveHostComplete,
base::Unretained(this), request.get()));
if (rv != net::ERR_IO_PENDING)
return;
// Store the request with the resolver so it can be cancelled on resolver
// shutdown.
bool insertion_result = requests_.emplace(std::move(request)).second;
DCHECK(insertion_result);
}
void HostResolver::MdnsListen(
const net::HostPortPair& host,
net::DnsQueryType query_type,
mojo::PendingRemote<mojom::MdnsListenClient> response_client,
MdnsListenCallback callback) {
#if BUILDFLAG(ENABLE_MDNS)
auto listener = std::make_unique<HostResolverMdnsListener>(internal_resolver_,
host, query_type);
int rv =
listener->Start(std::move(response_client),
base::BindOnce(&HostResolver::OnMdnsListenerCancelled,
base::Unretained(this), listener.get()));
if (rv == net::OK) {
bool insertion_result = listeners_.emplace(std::move(listener)).second;
DCHECK(insertion_result);
}
std::move(callback).Run(rv);
#else
NOTREACHED();
#endif // BUILDFLAG(ENABLE_MDNS)
}
size_t HostResolver::GetNumOutstandingRequestsForTesting() const {
return requests_.size();
}
void HostResolver::SetResolveHostCallbackForTesting(
ResolveHostCallback callback) {
GetResolveHostCallback() = std::move(callback);
}
void HostResolver::AsyncSetUp() {
receiver_.Bind(std::move(pending_receiver_));
receiver_.set_disconnect_handler(
base::BindOnce(&HostResolver::OnConnectionError, base::Unretained(this)));
}
void HostResolver::OnResolveHostComplete(ResolveHostRequest* request,
int error) {
DCHECK_NE(net::ERR_IO_PENDING, error);
auto found_request = requests_.find(request);
CHECK(found_request != requests_.end());
requests_.erase(found_request);
}
void HostResolver::OnMdnsListenerCancelled(HostResolverMdnsListener* listener) {
auto found_listener = listeners_.find(listener);
CHECK(found_listener != listeners_.end());
listeners_.erase(found_listener);
}
void HostResolver::OnConnectionError() {
DCHECK(connection_shutdown_callback_);
requests_.clear();
// Invoke last as callback may delete |this|.
std::move(connection_shutdown_callback_).Run(this);
}
} // namespace network
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