private DnsQueryRequest ParseQuery(ref MemoryStream ms)
{
DnsQueryRequest queryRequest = new DnsQueryRequest();
// Read name
queryRequest.Name = DnsRecordBase.ParseName(ref ms);
return(queryRequest);
}
internal void ParseResponse(byte[] recvBytes, ProtocolType protocol)
{
MemoryStream memoryStream = new MemoryStream(recvBytes);
byte[] flagBytes = new byte[2];
byte[] transactionId = new byte[2];
byte[] questions = new byte[2];
byte[] answerRRs = new byte[2];
byte[] authorityRRs = new byte[2];
byte[] additionalRRCountBytes = new byte[2];
byte[] nsType = new byte[2];
byte[] nsClass = new byte[2];
this._bytesReceived = recvBytes.Length;
// Parse DNS Response
memoryStream.Read(transactionId, 0, 2);
memoryStream.Read(flagBytes, 0, 2);
memoryStream.Read(questions, 0, 2);
memoryStream.Read(answerRRs, 0, 2);
memoryStream.Read(authorityRRs, 0, 2);
memoryStream.Read(additionalRRCountBytes, 0, 2);
// Parse Header
_transactionId = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(transactionId, 0));
_flags = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(flagBytes, 0));
_queryResponse = (QueryResponse)(_flags & (ushort)FlagMasks.QueryResponseMask);
_opCode = (OpCode)(_flags & (ushort)FlagMasks.OpCodeMask);
_nsFlags = (NsFlags)(_flags & (ushort)FlagMasks.NsFlagMask);
_rCode = (RCode)(_flags & (ushort)FlagMasks.RCodeMask);
// Parse Questions Section
_questions = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(questions, 0));
_answerRRs = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(answerRRs, 0));
_authorityRRs = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(authorityRRs, 0));
ushort additionalRRCount = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(additionalRRCountBytes, 0));
_additionalRecords = new List <IDnsRecord>();
_answers = new DnsRecordBase[_answerRRs];
_authoritiveNameServers = new DnsRecordBase[_authorityRRs];
// Parse Queries
_queryRequest = this.ParseQuery(ref memoryStream);
// Read dnsType
memoryStream.Read(nsType, 0, 2);
// Read dnsClass
memoryStream.Read(nsClass, 0, 2);
_nsType = (NsType)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(nsType, 0));
_nsClass = (NsClass)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(nsClass, 0));
// Read in Answer Blocks
for (int i = 0; i < _answerRRs; i++)
{
_answers[i] = RecordFactory.Create(ref memoryStream);
}
// Parse Authority Records
for (int i = 0; i < _authorityRRs; i++)
{
_authoritiveNameServers[i] = RecordFactory.Create(ref memoryStream);
}
// Parse Additional Records
for (int i = 0; i < additionalRRCount; i++)
{
_additionalRecords.Add(RecordFactory.Create(ref memoryStream));
}
}
