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CacheZoneManager: Setting failure record ttl to 60 and default maximum ttl of 1 day. Implemented DnsSpecialCacheRecord in Query().

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This commit is contained in:
Shreyas Zare
2021-06-19 14:09:38 +05:30
parent 4f9c0e7cfc
commit c45bf39435
1 changed files with 7 additions and 37 deletions
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44
DnsServerCore/Dns/ZoneManagers/CacheZoneManager.cs
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@@ -29,9 +29,10 @@ namespace DnsServerCore.Dns.ZoneManagers
{
#region variables
const uint FAILURE_RECORD_TTL = 30u;
const uint FAILURE_RECORD_TTL = 60u;
const uint NEGATIVE_RECORD_TTL = 300u;
const uint MINIMUM_RECORD_TTL = 10u;
const uint MAXIMUM_RECORD_TTL = 1 * 24 * 60 * 60;
const uint SERVE_STALE_TTL = 3 * 24 * 60 * 60; //3 days serve stale ttl as per https://www.rfc-editor.org/rfc/rfc8767.html suggestion
readonly DnsServer _dnsServer;
@@ -43,7 +44,7 @@ namespace DnsServerCore.Dns.ZoneManagers
#region constructor
public CacheZoneManager(DnsServer dnsServer)
: base(FAILURE_RECORD_TTL, NEGATIVE_RECORD_TTL, MINIMUM_RECORD_TTL, SERVE_STALE_TTL)
: base(FAILURE_RECORD_TTL, NEGATIVE_RECORD_TTL, MINIMUM_RECORD_TTL, MAXIMUM_RECORD_TTL, SERVE_STALE_TTL)
{
_dnsServer = dnsServer;
}
@@ -336,16 +337,16 @@ namespace DnsServerCore.Dns.ZoneManagers
//answer found in cache
DnsResourceRecord firstRR = answers[0];
if (firstRR.RDATA is DnsEmptyRecord dnsEmptyRecord)
if (firstRR.RDATA is DnsSpecialCacheRecord dnsSpecialCacheRecord)
{
if (serveStaleAndResetExpiry)
{
if (firstRR.IsStale)
firstRR.ResetExpiry(30); //reset expiry by 30 seconds so that resolver tries again only after 30 seconds as per draft-ietf-dnsop-serve-stale-04
if (dnsEmptyRecord.Authority is not null)
if (dnsSpecialCacheRecord.Authority is not null)
{
foreach (DnsResourceRecord record in dnsEmptyRecord.Authority)
foreach (DnsResourceRecord record in dnsSpecialCacheRecord.Authority)
{
if (record.IsStale)
record.ResetExpiry(30); //reset expiry by 30 seconds so that resolver tries again only after 30 seconds as per draft-ietf-dnsop-serve-stale-04
@@ -353,38 +354,7 @@ namespace DnsServerCore.Dns.ZoneManagers
}
}
return new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, null, dnsEmptyRecord.Authority);
}
if (firstRR.RDATA is DnsNXRecord dnsNXRecord)
{
if (serveStaleAndResetExpiry)
{
if (firstRR.IsStale)
firstRR.ResetExpiry(30); //reset expiry by 30 seconds so that resolver tries again only after 30 seconds as per draft-ietf-dnsop-serve-stale-04
if (dnsNXRecord.Authority is not null)
{
foreach (DnsResourceRecord record in dnsNXRecord.Authority)
{
if (record.IsStale)
record.ResetExpiry(30); //reset expiry by 30 seconds so that resolver tries again only after 30 seconds as per draft-ietf-dnsop-serve-stale-04
}
}
}
return new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NxDomain, request.Question, null, dnsNXRecord.Authority);
}
if (firstRR.RDATA is DnsFailureRecord dnsFailureRecord)
{
if (serveStaleAndResetExpiry)
{
if (firstRR.IsStale)
firstRR.ResetExpiry(30); //reset expiry by 30 seconds so that resolver tries again only after 30 seconds as per draft-ietf-dnsop-serve-stale-04
}
return new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, dnsFailureRecord.RCODE, request.Question);
return new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, dnsSpecialCacheRecord.RCODE, request.Question, null, dnsSpecialCacheRecord.Authority);
}
DnsResourceRecord lastRR = answers[answers.Count - 1];