mirror of
https://github.com/fergalmoran/DnsServer.git
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63 lines
2.0 KiB
C#
63 lines
2.0 KiB
C#
/*
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Technitium DNS Server
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Copyright (C) 2024 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 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 _prefetchQuestion;
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#endregion
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#region constructor
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public ResolverPrefetchDnsCache(DnsServer dnsServer, bool skipDnsAppAuthoritativeRequestHandlers, DnsQuestionRecord prefetchQuestion)
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: base(dnsServer, skipDnsAppAuthoritativeRequestHandlers)
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{
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_prefetchQuestion = prefetchQuestion;
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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, bool findClosestNameServers = false, bool resetExpiry = false)
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{
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if (_prefetchQuestion.Equals(request.Question[0]))
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{
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//request is for prefetch question
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if (!findClosestNameServers)
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return null; //dont give answer from cache for prefetch question
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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 QueryClosestDelegation(request);
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}
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return base.Query(request, serveStale, findClosestNameServers, resetExpiry);
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}
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#endregion
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}
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}
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