internal static DomainName Get(BackReferenceBinaryReader reader)
{
byte stringLength = reader.ReadByte();
if (stringLength >> 6 == 3)
{
//In case of pointer
ushort ptr;
BinaryHelper.FromBytes(new byte[] { (byte)(stringLength - (3 << 6)), reader.ReadByte() }, out ptr);
return(reader.Get <DomainName>(ptr));
}
else
{
DomainName dn = new DomainName();
reader.Register((int)reader.BaseStream.Position - 1, dn);
//stringLength = reader.ReadByte();
if (stringLength != 0)
{
dn.Add(Encoding.UTF8.GetString(reader.ReadBytes(stringLength), 0, stringLength));
//dn.Add(Encoding.UTF8.GetString(bytes, index + 1, bytes[index]));
dn.AddRange(DomainName.Get(reader));
}
//else
// index++;
return(dn);
}
}
internal static Ptr Get(BackReferenceBinaryReader reader)
{
Ptr p = new Ptr();
//useless datalength
reader.ReadBytes(2);
p.DomainName = DomainName.Get(reader);
//index += byteCount;
return(p);
}
internal static Answer Get(BackReferenceBinaryReader reader)
{
Answer a = new Answer();
a.DomainName = DomainName.Get(reader);
a.Type = (Type)BinaryHelper.ReadUInt16(reader);
a.Class = (Class)BinaryHelper.ReadUInt16(reader);
a.Ttl = BinaryHelper.ReadUInt32(reader);
a.ResponseData = ResponseData.Get(a.Type, reader);
return(a);
}
public static Message GetMessage(BinaryReader reader)
{
var backRefReader = reader as BackReferenceBinaryReader;
if (backRefReader == null)
{
backRefReader = new BackReferenceBinaryReader(reader.BaseStream, Encoding.BigEndianUnicode);
}
return(GetMessage(backRefReader));
}
internal static Srv Get(BackReferenceBinaryReader reader)
{
Srv srv = new Srv();
//Useless Datalength
reader.ReadBytes(2);
srv.Priority = BinaryHelper.ReadUInt16(reader);
srv.Weight = BinaryHelper.ReadUInt16(reader);
srv.Port = BinaryHelper.ReadUInt16(reader);
srv.Target = DomainName.Get(reader);
return(srv);
}
internal static Question Get(BackReferenceBinaryReader stream)
{
Question q = new Question();
q.DomainName = DomainName.Get(stream);
q.Type = (QType)BinaryHelper.ReadUInt16(stream);
ushort s = BinaryHelper.ReadUInt16(stream);
q.Class = (QClass)((ushort)(s << 1) >> 1);
q.CacheFlush = ((ushort)q.Class) != s;
return(q);
}
private static Message GetMessage(BackReferenceBinaryReader reader)
{
ushort id = BinaryHelper.ReadUInt16(reader);
Message m = new Message(id);
byte b = reader.ReadByte();
//Qr, Opcode, Aa, Tc, Rd
m.RecursionDesired = (b % 2) == 1;
b = (byte)(b >> 1);
m.Truncated = (b % 2) == 1;
b = (byte)(b >> 1);
m.AuthoritativeAnswer = (b % 2) == 1;
b = (byte)(b >> 1);
int opCodeNumber = b % 16;
m.OpCode = (OpCode)opCodeNumber;
b = (byte)(b >> 4);
m.QueryResponse = (Qr)b;
//Ra, Z, Rcode
b = reader.ReadByte();
m.RecursionAvailable = b > 127;
b = (byte)((b << 1) >> 1);
m.ResponseCode = (ResponseCode)b;
ushort questionEntryCount = BinaryHelper.ReadUInt16(reader);
ushort answerEntryCount = BinaryHelper.ReadUInt16(reader);
ushort authorityEntryCount = BinaryHelper.ReadUInt16(reader);
ushort additionalEntryCount = BinaryHelper.ReadUInt16(reader);
for (int i = 0; i < questionEntryCount; i++)
{
m.Questions.Add(Question.Get(reader));
}
for (int i = 0; i < answerEntryCount; i++)
{
m.Answers.Add(Answer.Get(reader));
}
for (int i = 0; i < authorityEntryCount; i++)
{
m.Authorities.Add(Answer.Get(reader));
}
for (int i = 0; i < additionalEntryCount; i++)
{
m.Additionals.Add(Answer.Get(reader));
}
return(m);
}
internal static ResponseData Get(Type type, BackReferenceBinaryReader reader)
{
switch (type)
{
case Type.A:
case Type.AAAA:
return(HostAddress.Get(reader));
case Type.NS:
break;
case Type.MD:
break;
case Type.MF:
break;
case Type.CNAME:
return(CName.Get(reader));
case Type.SOA:
break;
case Type.MB:
break;
case Type.MG:
break;
case Type.MR:
break;
case Type.NULL:
break;
case Type.WKS:
break;
case Type.PTR:
return(Ptr.Get(reader));
case Type.HINFO:
break;
case Type.MINFO:
break;
case Type.MX:
break;
case Type.TXT:
return(Txt.Get(reader));
case Type.SRV:
return(Srv.Get(reader));
default:
break;
}
return(UnknownResponseData.Get(reader));
}
