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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 "content/browser/system_dns_resolution/system_dns_resolver.h"
#include <algorithm>
#include <memory>
#include "base/functional/bind.h"
#include "mojo/public/cpp/bindings/callback_helpers.h"
#include "net/base/address_list.h"
#include "net/base/net_errors.h"
#include "net/dns/dns_names_util.h"
#include "net/dns/host_resolver_system_task.h"
#include "net/log/net_log_source_type.h"
#include "net/log/net_log_with_source.h"
#include "services/network/public/mojom/system_dns_resolution.mojom.h"
namespace content {
namespace {
void ForwardSystemDnsResults(
std::unique_ptr<net::HostResolverSystemTask>,
network::mojom::SystemDnsResolver::ResolveCallback callback,
const net::AddressList& addr_list,
int os_error,
int net_error) {
std::move(callback).Run(addr_list, os_error, net_error);
}
} // namespace
SystemDnsResolverMojoImpl::SystemDnsResolverMojoImpl() {
net::EnsureSystemHostResolverCallReady();
}
// network::mojom::SystemDnsResolver impl:
void SystemDnsResolverMojoImpl::Resolve(
const std::optional<std::string>& hostname,
net::AddressFamily addr_family,
int32_t flags,
uint64_t network,
ResolveCallback callback) {
if (hostname && !net::dns_names_util::IsValidDnsName(*hostname)) {
std::move(callback).Run(net::AddressList(), 0, net::ERR_NAME_NOT_RESOLVED);
return;
}
auto wrapped_mojo_callback = mojo::WrapCallbackWithDefaultInvokeIfNotRun(
std::move(callback), net::AddressList(), 0, net::ERR_ABORTED);
// TODO(mpdenton): possibly add netlogging.
std::unique_ptr<net::HostResolverSystemTask> system_task =
std::make_unique<net::HostResolverSystemTask>(
hostname, addr_family, flags,
net::HostResolverSystemTask::Params(nullptr, 0),
net::NetLogWithSource(), network);
// Let the callback own the HostResolverSystemTask, and pass the callback
// to HostResolverSystemTask so it deletes itself on completion.
net::HostResolverSystemTask* system_task_ptr = system_task.get();
system_task_ptr->Start(base::BindOnce(&ForwardSystemDnsResults,
std::move(system_task),
std::move(wrapped_mojo_callback)));
}
} // namespace content
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