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59 lines
1.8 KiB
C#
59 lines
1.8 KiB
C#
/*
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Technitium DNS Server
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Copyright (C) 2020 Shreyas Zare (shreyas@technitium.com)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using DnsServerCore.Dns.ZoneManagers;
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using TechnitiumLibrary.Net.Dns;
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namespace DnsServerCore.Dns
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{
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class ResolverPrefetchDnsCache : ResolverDnsCache
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{
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#region variables
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readonly DnsQuestionRecord _prefetchQuery;
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#endregion
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#region constructor
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public ResolverPrefetchDnsCache(AuthZoneManager authZoneManager, CacheZoneManager cacheZoneManager, DnsQuestionRecord prefetchQuery)
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: base(authZoneManager, cacheZoneManager)
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{
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_prefetchQuery = prefetchQuery;
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}
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#endregion
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#region public
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public override DnsDatagram Query(DnsDatagram request, bool serveStale = false)
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{
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if (_prefetchQuery.Equals(request.Question[0]))
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{
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//return closest name servers so that the recursive resolver queries them to refreshes cache instead of returning response from cache
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return _cacheZoneManager.QueryClosestDelegation(request);
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}
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return base.Query(request, serveStale);
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}
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#endregion
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}
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}
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