public DnsDatagram(dynamic jsonResponse)
{
_header = new DnsHeader(jsonResponse);
{
_question = new DnsQuestionRecord[_header.QDCOUNT];
int i = 0;
foreach (dynamic jsonQuestionRecord in jsonResponse.Question)
{
_question[i++] = new DnsQuestionRecord(jsonQuestionRecord);
}
}
if (jsonResponse.Answer == null)
{
_answer = new DnsResourceRecord[] { };
}
else
{
_answer = new DnsResourceRecord[_header.ANCOUNT];
int i = 0;
foreach (dynamic jsonAnswerRecord in jsonResponse.Answer)
{
_answer[i++] = new DnsResourceRecord(jsonAnswerRecord);
}
}
if (jsonResponse.Authority == null)
{
_authority = new DnsResourceRecord[] { };
}
else
{
_authority = new DnsResourceRecord[_header.NSCOUNT];
int i = 0;
foreach (dynamic jsonAuthorityRecord in jsonResponse.Authority)
{
_authority[i++] = new DnsResourceRecord(jsonAuthorityRecord);
}
}
if (jsonResponse.Additional == null)
{
_additional = new DnsResourceRecord[] { };
}
else
{
_additional = new DnsResourceRecord[_header.ARCOUNT];
int i = 0;
foreach (dynamic jsonAdditionalRecord in jsonResponse.Additional)
{
_additional[i++] = new DnsResourceRecord(jsonAdditionalRecord);
}
}
}
internal DnsDatagram CloneRequest()
{
DnsQuestionRecord[] clonedQuestion = new DnsQuestionRecord[_question.Count];
for (int i = 0; i < _question.Count; i++)
{
clonedQuestion[i] = _question[i].Clone();
}
return(new DnsDatagram(_ID, _QR == 1, _OPCODE, _AA == 1, _TC == 1, _RD == 1, _RA == 1, _AD == 1, _CD == 1, _RCODE, clonedQuestion, _answer, _authority, _additional));
}
private DnsDatagram QueryCache(DnsHeader header, DnsQuestionRecord question)
{
string domain = question.Name.ToLower();
DnsResourceRecord[] records = GetRecords(domain, question.Type);
if (records != null)
{
if (records[0].RDATA is DnsEmptyRecord)
{
return(new DnsDatagram(new DnsHeader(header.Identifier, true, DnsOpcode.StandardQuery, false, false, header.RecursionDesired, true, false, false, DnsResponseCode.NoError, 1, 0, 1, 0), new DnsQuestionRecord[] { question }, new DnsResourceRecord[] { }, new DnsResourceRecord[] { (records[0].RDATA as DnsEmptyRecord).Authority }, new DnsResourceRecord[] { }));
}
if (records[0].RDATA is DnsNXRecord)
{
return(new DnsDatagram(new DnsHeader(header.Identifier, true, DnsOpcode.StandardQuery, false, false, header.RecursionDesired, true, false, false, DnsResponseCode.NameError, 1, 0, 1, 0), new DnsQuestionRecord[] { question }, new DnsResourceRecord[] { }, new DnsResourceRecord[] { (records[0].RDATA as DnsNXRecord).Authority }, new DnsResourceRecord[] { }));
}
return(new DnsDatagram(new DnsHeader(header.Identifier, true, DnsOpcode.StandardQuery, false, false, header.RecursionDesired, true, false, false, DnsResponseCode.NoError, 1, (ushort)records.Length, 0, 0), new DnsQuestionRecord[] { question }, records, new DnsResourceRecord[] { }, new DnsResourceRecord[] { }));
}
DnsResourceRecord[] nameServers = GetNearestNameServers(domain);
if (nameServers != null)
{
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)
{
glueRecords.AddRange(glueAs);
}
DnsResourceRecord[] glueAAAAs = GetRecords(nsDomain, DnsResourceRecordType.AAAA);
if (glueAAAAs != null)
{
glueRecords.AddRange(glueAAAAs);
}
}
DnsResourceRecord[] additional = glueRecords.ToArray();
return(new DnsDatagram(new DnsHeader(header.Identifier, true, DnsOpcode.StandardQuery, false, false, header.RecursionDesired, true, false, false, DnsResponseCode.NoError, 1, 0, (ushort)nameServers.Length, (ushort)additional.Length), new DnsQuestionRecord[] { question }, new DnsResourceRecord[] { }, nameServers, additional));
}
return(null);
}
public static DnsDatagram ResolveViaNameServers(string domain, DnsResourceRecordType queryType, NameServerAddress[] nameServers = null, IDnsCache cache = null, NetProxy proxy = null, bool preferIPv6 = false, bool tcp = false, int retries = 2, int maxStackCount = 10)
{
DnsQuestionRecord question;
if (queryType == DnsResourceRecordType.PTR)
{
question = new DnsQuestionRecord(IPAddress.Parse(domain), DnsClass.IN);
}
else
{
question = new DnsQuestionRecord(domain, queryType, DnsClass.IN);
}
return(ResolveViaNameServers(question, nameServers, cache, proxy, preferIPv6, tcp, retries, maxStackCount));
}
internal DnsDatagram CloneHeadersAndQuestions()
{
DnsQuestionRecord[] clonedQuestion = new DnsQuestionRecord[_question.Count];
for (int i = 0; i < _question.Count; i++)
{
clonedQuestion[i] = _question[i].Clone();
}
DnsDatagram datagram = new DnsDatagram(_ID, _QR == 1, _OPCODE, _AA == 1, _TC == 1, _RD == 1, _RA == 1, _AD == 1, _CD == 1, _RCODE, clonedQuestion, _answer, _authority, _additional);
datagram._metadata = _metadata;
return(datagram);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj))
{
return(false);
}
if (ReferenceEquals(this, obj))
{
return(true);
}
DnsQuestionRecord other = obj as DnsQuestionRecord;
if (other == null)
{
return(false);
}
if (!_name.Equals(other._name, StringComparison.OrdinalIgnoreCase))
{
return(false);
}
if (_type != other._type)
{
return(false);
}
if (_class != other._class)
{
return(false);
}
return(true);
}
public DnsDatagram Resolve(DnsQuestionRecord questionRecord)
{
return(Resolve(new DnsDatagram(new DnsHeader(0, false, DnsOpcode.StandardQuery, false, false, true, false, false, false, DnsResponseCode.NoError, 1, 0, 0, 0), new DnsQuestionRecord[] { questionRecord }, null, null, null)));
}
public static DnsDatagram ResolveViaNameServers(DnsQuestionRecord question, NameServerAddress[] nameServers = null, IDnsCache cache = null, NetProxy proxy = null, bool preferIPv6 = false, bool tcp = false, int retries = 2, int maxStackCount = 10)
{
if ((nameServers != null) && (nameServers.Length > 0))
{
//create copy of name servers array so that the values in original array are not messed due to shuffling feature
NameServerAddress[] nameServersCopy = new NameServerAddress[nameServers.Length];
Array.Copy(nameServers, nameServersCopy, nameServers.Length);
nameServers = nameServersCopy;
}
Stack <ResolverData> resolverStack = new Stack <ResolverData>();
int stackNameServerIndex = 0;
while (true) //stack loop
{
if (resolverStack.Count > maxStackCount)
{
while (resolverStack.Count > 0)
{
ResolverData data = resolverStack.Pop();
question = data.Question;
}
throw new DnsClientException("DnsClient exceeded the maximum stack count to resolve the domain: " + question.Name);
}
if (cache != null)
{
DnsDatagram request = new DnsDatagram(new DnsHeader(0, false, DnsOpcode.StandardQuery, false, false, true, false, false, false, DnsResponseCode.NoError, 1, 0, 0, 0), new DnsQuestionRecord[] { question }, null, null, null);
DnsDatagram cacheResponse = cache.Query(request);
switch (cacheResponse.Header.RCODE)
{
case DnsResponseCode.NoError:
if (cacheResponse.Answer.Length > 0)
{
if (resolverStack.Count == 0)
{
return(cacheResponse);
}
else
{
ResolverData data = resolverStack.Pop();
question = data.Question;
nameServers = data.NameServers;
stackNameServerIndex = data.NameServerIndex;
switch (cacheResponse.Answer[0].Type)
{
case DnsResourceRecordType.AAAA:
nameServers[stackNameServerIndex] = new NameServerAddress(nameServers[stackNameServerIndex].Domain, (cacheResponse.Answer[0].RDATA as DnsAAAARecord).Address);
break;
case DnsResourceRecordType.A:
nameServers[stackNameServerIndex] = new NameServerAddress(nameServers[stackNameServerIndex].Domain, (cacheResponse.Answer[0].RDATA as DnsARecord).Address);
break;
default:
//didnt find IP for current name server
stackNameServerIndex++; //increment to skip current name server
break;
}
continue; //stack loop
}
}
if (cacheResponse.Authority.Length > 0)
{
if (cacheResponse.Authority[0].Type == DnsResourceRecordType.SOA)
{
if (resolverStack.Count == 0)
{
return(cacheResponse);
}
else
{
if (question.Type == DnsResourceRecordType.AAAA)
{
question = new DnsQuestionRecord(question.Name, DnsResourceRecordType.A, question.Class);
}
else
{
//didnt find IP for current name server
//pop and try next name server
ResolverData data = resolverStack.Pop();
question = data.Question;
nameServers = data.NameServers;
stackNameServerIndex = data.NameServerIndex + 1; //increment to skip current name server
}
continue; //to stack loop
}
}
if ((nameServers == null) || (nameServers.Length == 0))
{
NameServerAddress[] cacheNameServers = NameServerAddress.GetNameServersFromResponse(cacheResponse, preferIPv6, true);
if (cacheNameServers.Length > 0)
{
nameServers = cacheNameServers;
}
}
}
break;
case DnsResponseCode.NameError:
if (resolverStack.Count == 0)
{
return(cacheResponse);
}
else
{
//current name server domain doesnt exists
//pop and try next name server
ResolverData data = resolverStack.Pop();
question = data.Question;
nameServers = data.NameServers;
stackNameServerIndex = data.NameServerIndex + 1; //increment to skip current name server
continue; //stack loop
}
}
}
if ((nameServers == null) || (nameServers.Length == 0))
{
//create copy of root name servers array so that the values in original array are not messed due to shuffling feature
if (preferIPv6)
{
nameServers = new NameServerAddress[ROOT_NAME_SERVERS_IPv6.Length];
Array.Copy(ROOT_NAME_SERVERS_IPv6, nameServers, ROOT_NAME_SERVERS_IPv6.Length);
}
else
{
nameServers = new NameServerAddress[ROOT_NAME_SERVERS_IPv4.Length];
Array.Copy(ROOT_NAME_SERVERS_IPv4, nameServers, ROOT_NAME_SERVERS_IPv4.Length);
}
}
NameServerAddress.Shuffle(nameServers);
int hopCount = 0;
while ((hopCount++) < MAX_HOPS) //resolver loop
{
//copy and reset stack name server index since its one time use only after stack pop
int i = stackNameServerIndex;
stackNameServerIndex = 0;
//query name servers one by one
for (; i < nameServers.Length; i++) //retry next server loop
{
NameServerAddress currentNameServer = nameServers[i];
if (question.Name == currentNameServer.Domain)
{
continue; //obvious!
}
if (currentNameServer.EndPoint == null)
{
resolverStack.Push(new ResolverData(question, nameServers, i));
if (preferIPv6)
{
question = new DnsQuestionRecord(currentNameServer.Domain, DnsResourceRecordType.AAAA, question.Class);
}
else
{
question = new DnsQuestionRecord(currentNameServer.Domain, DnsResourceRecordType.A, question.Class);
}
nameServers = null;
goto stackLoop;
}
DnsClient client = new DnsClient(currentNameServer);
client._proxy = proxy;
client._preferIPv6 = preferIPv6;
client._tcp = tcp;
client._retries = retries;
DnsDatagram request = new DnsDatagram(new DnsHeader(0, false, DnsOpcode.StandardQuery, false, false, true, false, false, false, DnsResponseCode.NoError, 1, 0, 0, 0), new DnsQuestionRecord[] { question }, null, null, null);
DnsDatagram response;
try
{
response = client.Resolve(request);
}
catch (DnsClientException)
{
continue; //resolver loop
}
if (response.Header.Truncation)
{
if (tcp)
{
return(response);
}
client._tcp = true;
response = client.Resolve(request);
}
if (cache != null)
{
cache.CacheResponse(response);
}
switch (response.Header.RCODE)
{
case DnsResponseCode.NoError:
if (response.Answer.Length > 0)
{
if (!response.Answer[0].Name.Equals(question.Name, StringComparison.CurrentCultureIgnoreCase))
{
continue; //continue to next name server since current name server may be misconfigured
}
if (resolverStack.Count == 0)
{
return(response);
}
else
{
ResolverData data = resolverStack.Pop();
question = data.Question;
nameServers = data.NameServers;
stackNameServerIndex = data.NameServerIndex;
switch (response.Answer[0].Type)
{
case DnsResourceRecordType.AAAA:
nameServers[stackNameServerIndex] = new NameServerAddress(nameServers[stackNameServerIndex].Domain, (response.Answer[0].RDATA as DnsAAAARecord).Address);
break;
case DnsResourceRecordType.A:
nameServers[stackNameServerIndex] = new NameServerAddress(nameServers[stackNameServerIndex].Domain, (response.Answer[0].RDATA as DnsARecord).Address);
break;
default:
//didnt find IP for current name server
stackNameServerIndex++; //increment to skip current name server
break;
}
goto resolverLoop;
}
}
if (response.Authority.Length == 0)
{
continue; //continue to next name server since current name server may be misconfigured
}
if (response.Authority[0].Type == DnsResourceRecordType.SOA)
{
//no entry for given type
if (resolverStack.Count == 0)
{
return(response);
}
else
{
if (question.Type == DnsResourceRecordType.AAAA)
{
question = new DnsQuestionRecord(question.Name, DnsResourceRecordType.A, question.Class);
}
else
{
//didnt find IP for current name server
//pop and try next name server
ResolverData data = resolverStack.Pop();
question = data.Question;
nameServers = data.NameServers;
stackNameServerIndex = data.NameServerIndex + 1; //increment to skip current name server
}
goto stackLoop; //goto stack loop
}
}
nameServers = NameServerAddress.GetNameServersFromResponse(response, preferIPv6, false);
if (nameServers.Length == 0)
{
continue; //continue to next name server since current name server may be misconfigured
}
goto resolverLoop;
case DnsResponseCode.NameError:
if (resolverStack.Count == 0)
{
return(response);
}
else
{
//current name server domain doesnt exists
//pop and try next name server
ResolverData data = resolverStack.Pop();
question = data.Question;
nameServers = data.NameServers;
stackNameServerIndex = data.NameServerIndex + 1; //increment to skip current name server
goto stackLoop; //goto stack loop
}
default:
continue; //continue to next name server since current name server may be misconfigured
}
}
if (resolverStack.Count == 0)
{
throw new DnsClientException("DnsClient failed to resolve the request: no response from name servers.");
}
else
{
//didnt find IP for current name server
//pop and try next name server
ResolverData data = resolverStack.Pop();
question = data.Question;
nameServers = data.NameServers;
stackNameServerIndex = data.NameServerIndex + 1; //increment to skip current name server
break; //to stack loop
}
resolverLoop :;
}
stackLoop :;
}
}
public ResolverData(DnsQuestionRecord question, NameServerAddress[] nameServers, int nameServerIndex)
{
this.Question = question;
this.NameServers = nameServers;
this.NameServerIndex = nameServerIndex;
}
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 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[] { }));
}
