private void ResolveCNAME(DnsQuestionRecord question, DnsResourceRecord lastCNAME, bool serveStale, List <DnsResourceRecord> answerRecords)
{
int queryCount = 0;
do
{
if (!_root.TryGet((lastCNAME.RDATA as DnsCNAMERecord).Domain, out CacheZone cacheZone))
{
break;
}
IReadOnlyList <DnsResourceRecord> records = cacheZone.QueryRecords(question.Type, serveStale, true);
if (records.Count < 1)
{
break;
}
answerRecords.AddRange(records);
if (records[0].Type != DnsResourceRecordType.CNAME)
{
break;
}
lastCNAME = records[0];
}while (++queryCount < DnsServer.MAX_CNAME_HOPS);
}
public IReadOnlyList <DnsResourceRecord> QueryRecords(string domain, DnsResourceRecordType type)
{
if (_root.TryGet(domain, out AuthZone zone))
{
return(zone.QueryRecords(type));
}
return(Array.Empty <DnsResourceRecord>());
}
public List <DnsResourceRecord> ListAllRecords(string domain)
{
if (_root.TryGet(domain, out CacheZone zone))
{
return(zone.ListAllRecords());
}
return(new List <DnsResourceRecord>(0));
}
private AuthZone CreateEmptyZone(AuthZoneInfo zoneInfo)
{
AuthZone zone;
switch (zoneInfo.Type)
{
case AuthZoneType.Primary:
zone = new PrimaryZone(_dnsServer, zoneInfo);
break;
case AuthZoneType.Secondary:
zone = new SecondaryZone(_dnsServer, zoneInfo);
break;
case AuthZoneType.Stub:
zone = new StubZone(_dnsServer, zoneInfo);
break;
case AuthZoneType.Forwarder:
zone = new ForwarderZone(zoneInfo);
break;
default:
throw new InvalidDataException("DNS zone type not supported.");
}
if (_root.TryAdd(zone))
{
_totalZones++;
return(zone);
}
if (_root.TryGet(zoneInfo.Name, out AuthZone existingZone) && (existingZone is SubDomainZone))
{
_root[zoneInfo.Name] = zone;
_totalZones++;
return(zone);
}
throw new DnsServerException("Zone already exists: " + zoneInfo.Name);
}
