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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DNS_DNS_UDP_TRACKER_H_
#define NET_DNS_DNS_UDP_TRACKER_H_
#include <stdint.h>
#include "base/containers/circular_deque.h"
#include "base/time/default_tick_clock.h"
#include "base/time/time.h"
#include "net/base/net_export.h"
namespace base {
class TickClock;
} // namespace base
namespace net {
// Data tracker for DNS UDP and its usage of local ports. Intended to be owned
// by a DnsSession and thus keep track of the data session-wide. Responsible for
// related metrics and used to inform behavior based on the stored data.
//
// TODO(ericorth@chromium.org): Add methods to access the stored data or
// conclusions about it.
class NET_EXPORT_PRIVATE DnsUdpTracker {
public:
static constexpr base::TimeDelta kMaxAge = base::TimeDelta::FromMinutes(10);
static constexpr size_t kMaxRecordedQueries = 256;
DnsUdpTracker();
~DnsUdpTracker();
DnsUdpTracker(DnsUdpTracker&&);
DnsUdpTracker& operator=(DnsUdpTracker&&);
void RecordQuery(uint16_t port, uint16_t query_id);
void RecordResponseId(uint16_t query_id, uint16_t response_id);
void set_tick_clock_for_testing(base::TickClock* tick_clock) {
tick_clock_ = tick_clock;
}
private:
struct QueryData;
void PurgeOldQueries();
void SaveQuery(QueryData query);
base::circular_deque<QueryData> recent_queries_;
const base::TickClock* tick_clock_ = base::DefaultTickClock::GetInstance();
};
} // namespace net
#endif // NET_DNS_DNS_UDP_TRACKER_H_
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