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CacheZone: implemented DnsSpecialCacheRecord.

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This commit is contained in:
Shreyas Zare
2021-06-19 14:21:09 +05:30
parent 8ec8934197
commit c697384134
1 changed files with 6 additions and 5 deletions
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11
DnsServerCore/Dns/Zones/CacheZone.cs
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@@ -48,7 +48,7 @@ namespace DnsServerCore.Dns.Zones
if (filterSpecialCacheRecords)
{
if ((record.RDATA is DnsCache.DnsNXRecord) || (record.RDATA is DnsCache.DnsEmptyRecord) || (record.RDATA is DnsCache.DnsFailureRecord))
if (record.RDATA is DnsCache.DnsSpecialCacheRecord)
return Array.Empty<DnsResourceRecord>(); //special cache record
}
@@ -64,7 +64,7 @@ namespace DnsServerCore.Dns.Zones
if (filterSpecialCacheRecords)
{
if ((record.RDATA is DnsCache.DnsNXRecord) || (record.RDATA is DnsCache.DnsEmptyRecord) || (record.RDATA is DnsCache.DnsFailureRecord))
if (record.RDATA is DnsCache.DnsSpecialCacheRecord)
continue; //special cache record
}
@@ -91,12 +91,13 @@ namespace DnsServerCore.Dns.Zones
public void SetRecords(DnsResourceRecordType type, IReadOnlyList<DnsResourceRecord> records, bool serveStale)
{
if ((records.Count > 0) && (records[0].RDATA is DnsCache.DnsFailureRecord))
bool isFailureRecord = (records.Count > 0) && (records[0].RDATA is DnsCache.DnsSpecialCacheRecord splRecord) && splRecord.IsFailure;
if (isFailureRecord)
{
//call trying to cache failure record
if (_entries.TryGetValue(type, out IReadOnlyList<DnsResourceRecord> existingRecords))
{
if ((existingRecords.Count > 0) && !(existingRecords[0].RDATA is DnsCache.DnsFailureRecord) && !existingRecords[0].IsExpired(serveStale))
if ((existingRecords.Count > 0) && !(existingRecords[0].RDATA is DnsCache.DnsSpecialCacheRecord existingSplRecord && existingSplRecord.IsFailure) && !existingRecords[0].IsExpired(serveStale))
return; //skip to avoid overwriting a useful record with a failure record
}
}
@@ -104,7 +105,7 @@ namespace DnsServerCore.Dns.Zones
//set records
_entries[type] = records;
if (serveStale && (records.Count > 0) && !(records[0].RDATA is DnsCache.DnsFailureRecord))
if (serveStale && !isFailureRecord)
{
//remove stale CNAME entry only when serve stale is enabled
//making sure current record is not a failure record causing removal of useful stale CNAME record