public Response ParseResponse(byte[] recvBytes)
{
var memoryStream = new MemoryStream(recvBytes);
var flagBytesBuffer = new byte[2];
var transactionIdBuffer = new byte[2];
var questionsBuffer = new byte[2];
var answerRRsBuffer = new byte[2];
var authorityRRsBuffer = new byte[2];
var additionalRRCountBytesBuffer = new byte[2];
var nsTypeBuffer = new byte[2];
var nsClassBuffer = new byte[2];
var bytesReceived = recvBytes.Length;
// Parse DNS Response
memoryStream.Read(transactionIdBuffer, 0, 2);
memoryStream.Read(flagBytesBuffer, 0, 2);
memoryStream.Read(questionsBuffer, 0, 2);
memoryStream.Read(answerRRsBuffer, 0, 2);
memoryStream.Read(authorityRRsBuffer, 0, 2);
memoryStream.Read(additionalRRCountBytesBuffer, 0, 2);
// Parse Header
var transactionId = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(transactionIdBuffer, 0));
var flags = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(flagBytesBuffer, 0));
var queryResponse = (QueryResponse)(flags & (ushort)FlagMasks.QueryResponseMask);
var opCode = (OpCode)(flags & (ushort)FlagMasks.OpCodeMask);
var nsFlags = (NsFlags)(flags & (ushort)FlagMasks.NsFlagMask);
var rCode = (RCode)(flags & (ushort)FlagMasks.RCodeMask);
// Parse Questions Section
var questions = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(questionsBuffer, 0));
var answerRRs = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(answerRRsBuffer, 0));
var authorityRRs = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(authorityRRsBuffer, 0));
var additionalRRCount = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(additionalRRCountBytesBuffer, 0));
var additionalRecords = new List<Record>();
var answers = new Record[answerRRs];
var authoritiveNameServers = new Record[authorityRRs];
var name = _recordNameParser.ParseName(ref memoryStream);
// Read dnsType
memoryStream.Read(nsTypeBuffer, 0, 2);
// Read dnsClass
memoryStream.Read(nsClassBuffer, 0, 2);
var nsType = (NsType)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(nsTypeBuffer, 0));
var nsClass = (NsClass)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(nsClassBuffer, 0));
var headerParser = new RecordHeaderParser(_recordNameParser);
// Read in Answer Blocks
for (var i = 0; i < answerRRs; i++)
{
var header = headerParser.Parse(ref memoryStream);
var parser = _parserFactory.Get(header.NsType);
answers[i] = parser.ParseRecord(header, ref memoryStream);
}
// Parse Authority Records
for (var i = 0; i < authorityRRs; i++)
{
var header = headerParser.Parse(ref memoryStream);
var parser = _parserFactory.Get(header.NsType);
authoritiveNameServers[i] = parser.ParseRecord(header, ref memoryStream);
}
// Parse Additional Records
for (var i = 0; i < additionalRRCount; i++)
{
var header = headerParser.Parse(ref memoryStream);
var parser = _parserFactory.Get(header.NsType);
additionalRecords.Add(parser.ParseRecord(header, ref memoryStream));
}
return new Response(transactionId, flags, queryResponse, opCode, nsFlags, rCode, questions, answerRRs, authorityRRs, name, nsType, nsClass, additionalRecords, bytesReceived, answers, authoritiveNameServers);
}
public Response(
ushort transactionId,
ushort flags,
QueryResponse queryResponse,
OpCode opCode,
NsFlags nsFlags,
RCode rCode,
ushort questions,
ushort answerRRs,
ushort authorityRRs,
string name,
NsType nsType,
NsClass nsClass,
List<Record> additionalRecords,
int bytesReceived,
Record[] answers,
Record[] authoritiveNameServers
)
{
_bytesReceived = bytesReceived;
_answers = answers;
_authoritiveNameServers = authoritiveNameServers;
_transactionId = transactionId;
_flags = flags;
_queryResponse = queryResponse;
_opCode = opCode;
_nsFlags = nsFlags;
_rCode = rCode;
_questions = questions;
_answerRRs = answerRRs;
_authorityRRs = authorityRRs;
_name = name;
_nsType = nsType;
_nsClass = nsClass;
_additionalRecords = additionalRecords;
}