public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj))
{
return(false);
}
if (ReferenceEquals(this, obj))
{
return(true);
}
DnsANYRecord other = obj as DnsANYRecord;
if (other == null)
{
return(false);
}
return(true);
}
public virtual DnsDatagram Query(DnsDatagram request, bool serveStale = false)
{
if (serveStale)
{
throw new NotImplementedException("DnsCache does not implement serve stale.");
}
DnsQuestionRecord question = request.Question[0];
IReadOnlyList <DnsResourceRecord> answerRecords = GetRecords(question.Name, question.Type);
if (answerRecords != null)
{
if (answerRecords[0].RDATA is DnsEmptyRecord)
{
DnsResourceRecord[] responseAuthority;
DnsResourceRecord authority = (answerRecords[0].RDATA as DnsEmptyRecord).Authority;
if (authority == null)
{
responseAuthority = Array.Empty <DnsResourceRecord>();
}
else
{
responseAuthority = new DnsResourceRecord[] { authority }
};
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, null, responseAuthority));
}
if (answerRecords[0].RDATA is DnsNXRecord)
{
DnsResourceRecord[] responseAuthority;
DnsResourceRecord authority = (answerRecords[0].RDATA as DnsNXRecord).Authority;
if (authority == null)
{
responseAuthority = Array.Empty <DnsResourceRecord>();
}
else
{
responseAuthority = new DnsResourceRecord[] { authority }
};
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NameError, request.Question, null, responseAuthority));
}
if (answerRecords[0].RDATA is DnsANYRecord)
{
DnsANYRecord anyRR = answerRecords[0].RDATA as DnsANYRecord;
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, anyRR.Records));
}
if (answerRecords[0].RDATA is DnsFailureRecord)
{
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, (answerRecords[0].RDATA as DnsFailureRecord).RCODE, request.Question));
}
IReadOnlyList <DnsResourceRecord> additionalRecords = null;
switch (question.Type)
{
case DnsResourceRecordType.NS:
case DnsResourceRecordType.MX:
case DnsResourceRecordType.SRV:
additionalRecords = GetAdditionalRecords(answerRecords);
break;
}
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, answerRecords, null, additionalRecords));
}
IReadOnlyList <DnsResourceRecord> closestAuthority = GetClosestNameServers(question.Name);
if (closestAuthority != null)
{
IReadOnlyList <DnsResourceRecord> additionalRecords = GetAdditionalRecords(closestAuthority);
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, null, closestAuthority, additionalRecords));
}
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.Refused, request.Question));
}
public override DnsDatagram Query(DnsDatagram request, bool serveStale = false)
{
CacheZone zone = _root.FindZone(request.Question[0].Name, out CacheZone delegation, out _, out _);
if (zone == null)
{
//zone not found
if (delegation == null)
{
//no cached delegation found
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.Refused, request.Question));
}
//return closest name servers in delegation
IReadOnlyList <DnsResourceRecord> authority = delegation.QueryRecords(DnsResourceRecordType.NS, serveStale, true);
List <DnsResourceRecord> additional = GetAdditionalRecords(authority, serveStale);
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, null, authority, additional));
}
//zone found
IReadOnlyList <DnsResourceRecord> answers = zone.QueryRecords(request.Question[0].Type, serveStale, false);
if (answers.Count > 0)
{
//answer found in cache
if (answers[0].RDATA is DnsEmptyRecord)
{
DnsResourceRecord[] authority = null;
DnsResourceRecord soaRecord = (answers[0].RDATA as DnsEmptyRecord).Authority;
if (soaRecord != null)
{
authority = new DnsResourceRecord[] { soaRecord }
}
;
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, null, authority));
}
if (answers[0].RDATA is DnsNXRecord)
{
DnsResourceRecord[] authority = null;
DnsResourceRecord soaRecord = (answers[0].RDATA as DnsNXRecord).Authority;
if (soaRecord != null)
{
authority = new DnsResourceRecord[] { soaRecord }
}
;
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NameError, request.Question, null, authority));
}
if (answers[0].RDATA is DnsANYRecord)
{
DnsANYRecord anyRR = answers[0].RDATA as DnsANYRecord;
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, anyRR.Records));
}
if (answers[0].RDATA is DnsFailureRecord)
{
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, (answers[0].RDATA as DnsFailureRecord).RCODE, request.Question));
}
IReadOnlyList <DnsResourceRecord> additional = null;
switch (request.Question[0].Type)
{
case DnsResourceRecordType.NS:
case DnsResourceRecordType.MX:
case DnsResourceRecordType.SRV:
additional = GetAdditionalRecords(answers, serveStale);
break;
}
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, answers, null, additional));
}
else
{
//no answer in cache; check for closest delegation if any
if (delegation == null)
{
//no cached delegation found
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.Refused, request.Question));
}
//return closest name servers in delegation
IReadOnlyList <DnsResourceRecord> authority = delegation.QueryRecords(DnsResourceRecordType.NS, false, true);
List <DnsResourceRecord> additional = GetAdditionalRecords(authority, false);
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, null, authority, additional));
}
}
#endregion
}
}
public virtual DnsDatagram Query(DnsDatagram request, bool serveStale = false)
{
if (serveStale)
{
throw new NotImplementedException("DnsCache does not implement serve stale.");
}
DnsQuestionRecord question = request.Question[0];
IReadOnlyList <DnsResourceRecord> answerRecords = GetRecords(question.Name, question.Type);
if (answerRecords != null)
{
if (answerRecords[0].RDATA is DnsEmptyRecord)
{
DnsResourceRecord[] responseAuthority;
DnsResourceRecord authority = (answerRecords[0].RDATA as DnsEmptyRecord).Authority;
if (authority == null)
{
responseAuthority = Array.Empty <DnsResourceRecord>();
}
else
{
responseAuthority = new DnsResourceRecord[] { authority }
};
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, null, responseAuthority));
}
if (answerRecords[0].RDATA is DnsNXRecord)
{
DnsResourceRecord[] responseAuthority;
DnsResourceRecord authority = (answerRecords[0].RDATA as DnsNXRecord).Authority;
if (authority == null)
{
responseAuthority = Array.Empty <DnsResourceRecord>();
}
else
{
responseAuthority = new DnsResourceRecord[] { authority }
};
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NameError, request.Question, null, responseAuthority));
}
if (answerRecords[0].RDATA is DnsANYRecord)
{
DnsANYRecord anyRR = answerRecords[0].RDATA as DnsANYRecord;
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, anyRR.Records));
}
if (answerRecords[0].RDATA is DnsFailureRecord)
{
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, (answerRecords[0].RDATA as DnsFailureRecord).RCODE, request.Question));
}
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, answerRecords));
}
string currentZone = question.Name;
while (currentZone != null)
{
IReadOnlyList <DnsResourceRecord> nameServers = GetClosestNameServers(currentZone);
if (nameServers == null)
{
break;
}
List <DnsResourceRecord> glueRecords = new List <DnsResourceRecord>();
foreach (DnsResourceRecord nameServer in nameServers)
{
string nsDomain = (nameServer.RDATA as DnsNSRecord).NameServer;
IReadOnlyList <DnsResourceRecord> glueAs = GetRecords(nsDomain, DnsResourceRecordType.A);
if ((glueAs != null) && (glueAs.Count > 0) && (glueAs[0].RDATA is DnsARecord))
{
glueRecords.AddRange(glueAs);
}
IReadOnlyList <DnsResourceRecord> glueAAAAs = GetRecords(nsDomain, DnsResourceRecordType.AAAA);
if ((glueAAAAs != null) && (glueAAAAs.Count > 0) && (glueAAAAs[0].RDATA is DnsAAAARecord))
{
glueRecords.AddRange(glueAAAAs);
}
}
if (glueRecords.Count > 0)
{
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.NoError, request.Question, null, nameServers, glueRecords));
}
currentZone = GetParentZone(currentZone);
}
return(new DnsDatagram(request.Identifier, true, DnsOpcode.StandardQuery, false, false, request.RecursionDesired, true, false, false, DnsResponseCode.Refused, request.Question));
}
public override DnsDatagram Query(DnsDatagram request)
{
DnsQuestionRecord question = request.Question[0];
DnsResourceRecord[] answerRecords = GetRecords(question.Name, question.Type);
if (answerRecords != null)
{
if (answerRecords[0].RDATA is DnsEmptyRecord)
{
DnsResourceRecord[] responseAuthority;
DnsResourceRecord authority = (answerRecords[0].RDATA as DnsEmptyRecord).Authority;
if (authority == null)
{
responseAuthority = new DnsResourceRecord[] { }
}
;
else
{
responseAuthority = new DnsResourceRecord[] { authority }
};
return(new DnsDatagram(new DnsHeader(request.Header.Identifier, true, DnsOpcode.StandardQuery, false, false, request.Header.RecursionDesired, true, false, false, DnsResponseCode.NoError, 1, 0, 1, 0), request.Question, new DnsResourceRecord[] { }, responseAuthority, new DnsResourceRecord[] { }));
}
if (answerRecords[0].RDATA is DnsNXRecord)
{
DnsResourceRecord[] responseAuthority;
DnsResourceRecord authority = (answerRecords[0].RDATA as DnsNXRecord).Authority;
if (authority == null)
{
responseAuthority = new DnsResourceRecord[] { }
}
;
else
{
responseAuthority = new DnsResourceRecord[] { authority }
};
return(new DnsDatagram(new DnsHeader(request.Header.Identifier, true, DnsOpcode.StandardQuery, false, false, request.Header.RecursionDesired, true, false, false, DnsResponseCode.NameError, 1, 0, 1, 0), request.Question, new DnsResourceRecord[] { }, responseAuthority, new DnsResourceRecord[] { }));
}
if (answerRecords[0].RDATA is DnsANYRecord)
{
DnsANYRecord anyRR = answerRecords[0].RDATA as DnsANYRecord;
return(new DnsDatagram(new DnsHeader(request.Header.Identifier, true, DnsOpcode.StandardQuery, false, false, request.Header.RecursionDesired, true, false, false, DnsResponseCode.NoError, 1, (ushort)anyRR.Records.Length, 0, 0), request.Question, anyRR.Records, new DnsResourceRecord[] { }, new DnsResourceRecord[] { }));
}
if (answerRecords[0].RDATA is DnsFailureRecord)
{
return(new DnsDatagram(new DnsHeader(request.Header.Identifier, true, DnsOpcode.StandardQuery, false, false, request.Header.RecursionDesired, true, false, false, (answerRecords[0].RDATA as DnsFailureRecord).RCODE, 1, 0, 0, 0), request.Question, new DnsResourceRecord[] { }, new DnsResourceRecord[] { }, new DnsResourceRecord[] { }));
}
return(new DnsDatagram(new DnsHeader(request.Header.Identifier, true, DnsOpcode.StandardQuery, false, false, request.Header.RecursionDesired, true, false, false, DnsResponseCode.NoError, 1, (ushort)answerRecords.Length, 0, 0), request.Question, answerRecords, new DnsResourceRecord[] { }, new DnsResourceRecord[] { }));
}
string currentZone = question.Name;
while (currentZone != null)
{
DnsResourceRecord[] nameServers = GetClosestNameServers(currentZone);
if (nameServers == null)
{
break;
}
List <DnsResourceRecord> glueRecords = new List <DnsResourceRecord>();
foreach (DnsResourceRecord nameServer in nameServers)
{
string nsDomain = (nameServer.RDATA as DnsNSRecord).NSDomainName;
DnsResourceRecord[] glueAs = GetRecords(nsDomain, DnsResourceRecordType.A);
if ((glueAs != null) && (glueAs.Length > 0) && (glueAs[0].RDATA is DnsARecord))
{
glueRecords.AddRange(glueAs);
}
DnsResourceRecord[] glueAAAAs = GetRecords(nsDomain, DnsResourceRecordType.AAAA);
if ((glueAAAAs != null) && (glueAAAAs.Length > 0) && (glueAAAAs[0].RDATA is DnsAAAARecord))
{
glueRecords.AddRange(glueAAAAs);
}
}
if (glueRecords.Count > 0)
{
DnsResourceRecord[] additional = glueRecords.ToArray();
return(new DnsDatagram(new DnsHeader(request.Header.Identifier, true, DnsOpcode.StandardQuery, false, false, request.Header.RecursionDesired, true, false, false, DnsResponseCode.NoError, 1, 0, (ushort)nameServers.Length, (ushort)additional.Length), request.Question, new DnsResourceRecord[] { }, nameServers, additional));
}
currentZone = GetParentZone(currentZone);
}
return(new DnsDatagram(new DnsHeader(request.Header.Identifier, true, DnsOpcode.StandardQuery, false, false, request.Header.RecursionDesired, true, false, false, DnsResponseCode.Refused, 1, 0, 0, 0), request.Question, new DnsResourceRecord[] { }, new DnsResourceRecord[] { }, new DnsResourceRecord[] { }));
}
