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ResolverPrefetchDnsCache: fixed prefetch query handling so that auth zone is also queried along with cache zone to get the most relevant closest name servers.

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This commit is contained in:
Shreyas Zare
2021-04-03 12:33:32 +05:30
parent 2dd9b89e74
commit 7975f07f42
1 changed files with 18 additions and 1 deletions
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19
DnsServerCore/Dns/ResolverPrefetchDnsCache.cs
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@@ -47,7 +47,24 @@ namespace DnsServerCore.Dns
if (_prefetchQuery.Equals(request.Question[0]))
{
//return closest name servers so that the recursive resolver queries them to refreshes cache instead of returning response from cache
return _cacheZoneManager.QueryClosestDelegation(request);
DnsDatagram authResponse = _authZoneManager.QueryClosestDelegation(request);
DnsDatagram cacheResponse = _cacheZoneManager.QueryClosestDelegation(request);
if ((authResponse.Authority.Count > 0) && (cacheResponse.Authority.Count > 0))
{
if (authResponse.Authority[0].Name.Length >= cacheResponse.Authority[0].Name.Length)
return authResponse;
return cacheResponse;
}
else if (authResponse.Authority.Count > 0)
{
return authResponse;
}
else
{
return cacheResponse;
}
}
return base.Query(request, serveStale);