/// <summary>
/// Common class for all record types that contain a preference and a domain name
/// </summary>
/// <param name="buffer"></param>
public PrefAndDomain(DataBuffer buffer)
{
preference = buffer.ReadBEShortInt();
domain = buffer.ReadDomainName();
}
/// <summary>
/// Create a Question record for Dns Answer
/// </summary>
/// <param name="buffer"></param>
public Question(DataBuffer buffer)
{
domain = buffer.ReadDomainName();
recType = (RecordType)buffer.ReadBEShortInt();
classType = buffer.ReadBEShortInt();
}
/// <summary>
/// Given a byte array interpret them as a DnsEntry
/// </summary>
/// <param name="response"></param>
public DnsAnswer(byte[] response)
{
questions = new List <Question>();
answers = new List <Answer>();
servers = new List <Server>();
additional = new List <Record>();
exceptions = new List <Exception>();
DataBuffer buffer = new DataBuffer(response, 2);
byte bits1 = buffer.ReadByte();
byte bits2 = buffer.ReadByte();
//Mask off return code
int returnCode = bits2 & 15;
if (returnCode > 6)
{
returnCode = 6;
}
this.returnCode = (ReturnCode)returnCode;
//Get Additional Flags
authoritative = TestBit(bits1, 2);
recursive = TestBit(bits2, 8);
truncated = TestBit(bits1, 1);
int nQuestions = buffer.ReadBEShortInt();
int nAnswers = buffer.ReadBEShortInt();
int nServers = buffer.ReadBEShortInt();
int nAdditional = buffer.ReadBEShortInt();
//read in questions
for (int i = 0; i < nQuestions; i++)
{
try
{
questions.Add(new Question(buffer));
}
catch (Exception ex)
{
exceptions.Add(ex);
}
}
//read in answers
for (int i = 0; i < nAnswers; i++)
{
try
{
answers.Add(new Answer(buffer));
}
catch (Exception ex)
{
exceptions.Add(ex);
}
}
//read in servers
for (int i = 0; i < nServers; i++)
{
try
{
servers.Add(new Server(buffer));
}
catch (Exception ex)
{
exceptions.Add(ex);
}
}
//read in additional records
for (int i = 0; i < nAdditional; i++)
{
try
{
additional.Add(new Record(buffer));
}
catch (Exception ex)
{
exceptions.Add(ex);
}
}
}