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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.
#ifndef NET_DNS_HOST_RESOLVER_NAT64_TASK_H_
#define NET_DNS_HOST_RESOLVER_NAT64_TASK_H_
#include <memory>
#include <string>
#include <string_view>
#include <vector>
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "net/dns/host_resolver.h"
#include "net/dns/host_resolver_manager.h"
#include "net/dns/public/dns_query_type.h"
namespace net {
class HostCache;
// Representation of a single HostResolverImpl::Job task to convert an IPv4
// address literal to an IPv4-Embedded IPv6 according to rfc6052.
// https://www.rfc-editor.org/rfc/rfc6052
// When a DNS64 is not found returns the original IPv4 address.
// Destruction cancels the task and prevents any callbacks from being invoked.
class HostResolverNat64Task {
public:
HostResolverNat64Task(std::string_view hostname,
NetworkAnonymizationKey network_anonymization_key,
NetLogWithSource net_log,
ResolveContext* resolve_context,
base::WeakPtr<HostResolverManager> resolver);
HostResolverNat64Task(const HostResolverNat64Task&) = delete;
HostResolverNat64Task& operator=(const HostResolverNat64Task&) = delete;
~HostResolverNat64Task();
// Should only be called once.
void Start(base::OnceClosure completion_closure);
// Results only available after invocation of the completion closure.
HostCache::Entry GetResults() const;
private:
const std::string hostname_;
const NetworkAnonymizationKey network_anonymization_key_;
NetLogWithSource net_log_;
const raw_ptr<ResolveContext> resolve_context_;
base::OnceClosure completion_closure_;
base::WeakPtr<HostResolverManager> resolver_;
SEQUENCE_CHECKER(sequence_checker_);
int DoResolve();
int DoResolveComplete(int result);
int DoSynthesizeToIpv6();
void OnIOComplete(int result);
int DoLoop(int result);
enum class State {
kResolve,
kResolveComplete,
kSynthesizeToIpv6,
kStateNone,
};
State next_state_ = State::kStateNone;
std::unique_ptr<HostResolver::ResolveHostRequest> request_ipv4onlyarpa_;
HostCache::Entry results_ =
HostCache::Entry(ERR_FAILED, HostCache::Entry::SOURCE_UNKNOWN);
base::WeakPtrFactory<HostResolverNat64Task> weak_ptr_factory_{this};
};
} // namespace net
#endif // NET_DNS_HOST_RESOLVER_NAT64_TASK_H_
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