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/*
* Copyright (C) 2019 Igalia S.L.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/HashMap.h>
#include <wtf/Lock.h>
#include <wtf/MonotonicTime.h>
#include <wtf/RefCounted.h>
#include <wtf/RunLoop.h>
#include <wtf/Vector.h>
#include <wtf/glib/GRefPtr.h>
#include <wtf/text/CString.h>
typedef struct _GInetAddress GInetAddress;
namespace WebKit {
class DNSCache : public RefCounted<DNSCache> {
public:
static Ref<DNSCache> create();
~DNSCache() = default;
enum class Type { Default, IPv4Only, IPv6Only };
std::optional<Vector<GRefPtr<GInetAddress>>> lookup(const CString& host, Type = Type::Default);
void update(const CString& host, Vector<GRefPtr<GInetAddress>>&&, Type = Type::Default);
void clear();
private:
DNSCache();
struct CachedResponse {
Vector<GRefPtr<GInetAddress>> addressList;
MonotonicTime expirationTime;
};
using DNSCacheMap = HashMap<CString, CachedResponse>;
DNSCacheMap& mapForType(Type) WTF_REQUIRES_LOCK(m_lock);
void removeExpiredResponsesFired();
void removeExpiredResponsesInMap(DNSCacheMap&);
void pruneResponsesInMap(DNSCacheMap&);
Lock m_lock;
DNSCacheMap m_dnsMap WTF_GUARDED_BY_LOCK(m_lock);
DNSCacheMap m_ipv4Map;
DNSCacheMap m_ipv6Map;
RunLoop::Timer m_expiredTimer;
};
} // namespace WebKit
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