public MX(Stream Stream)
: base(Stream, TypeId)
{
this._Preference = (Stream.ReadByte() << 8) | (Stream.ReadByte() & Byte.MaxValue);
this._Exchange = DNSTools.ExtractName(Stream);
}
public MINFO(String Name,
Stream Stream)
: base(Name, TypeId, Stream)
{
this._Text = DNSTools.ExtractName(Stream);
}
public SSHFP(Stream Stream)
: base(Stream, TypeId)
{
this._Algorithm = (SSHFP_Algorithm)(Stream.ReadByte() & Byte.MaxValue);
this._Typ = (SSHFP_FingerprintType)(Stream.ReadByte() & Byte.MaxValue);
this._Fingerprint = DNSTools.ExtractName(Stream);
}
public SOA(Stream Stream)
: base(Stream, TypeId)
{
this._Server = DNSTools.ExtractName(Stream);
this._Email = DNSTools.ExtractName(Stream);
this._Serial = (Stream.ReadByte() & Byte.MaxValue) << 24 | (Stream.ReadByte() & Byte.MaxValue) << 16 | (Stream.ReadByte() & Byte.MaxValue) << 8 | Stream.ReadByte() & Byte.MaxValue;
this._Refresh = (Stream.ReadByte() & Byte.MaxValue) << 24 | (Stream.ReadByte() & Byte.MaxValue) << 16 | (Stream.ReadByte() & Byte.MaxValue) << 8 | Stream.ReadByte() & Byte.MaxValue;
this._Retry = (Stream.ReadByte() & Byte.MaxValue) << 24 | (Stream.ReadByte() & Byte.MaxValue) << 16 | (Stream.ReadByte() & Byte.MaxValue) << 8 | Stream.ReadByte() & Byte.MaxValue;
this._Expire = (Stream.ReadByte() & Byte.MaxValue) << 24 | (Stream.ReadByte() & Byte.MaxValue) << 16 | (Stream.ReadByte() & Byte.MaxValue) << 8 | Stream.ReadByte() & Byte.MaxValue;
this._Minimum = (Stream.ReadByte() & Byte.MaxValue) << 24 | (Stream.ReadByte() & Byte.MaxValue) << 16 | (Stream.ReadByte() & Byte.MaxValue) << 8 | Stream.ReadByte() & Byte.MaxValue;
}
protected ADNSResourceRecord(Stream DNSStream, UInt16 Type)
{
this._Name = DNSTools.ExtractName(DNSStream);
this._Type = Type;
//this._Type = (DNSResourceRecordTypes) ((DNSStream.ReadByte() & byte.MaxValue) << 8 | DNSStream.ReadByte() & byte.MaxValue);
//if (_Type != Type)
// throw new ArgumentException("Invalid DNS RR Type!");
this._Class = (DNSQueryClasses)((DNSStream.ReadByte() & byte.MaxValue) << 8 | DNSStream.ReadByte() & byte.MaxValue);
this._TimeToLive = TimeSpan.FromSeconds((DNSStream.ReadByte() & byte.MaxValue) << 24 | (DNSStream.ReadByte() & byte.MaxValue) << 16 | (DNSStream.ReadByte() & byte.MaxValue) << 8 | DNSStream.ReadByte() & byte.MaxValue);
this._EndOfLife = DateTime.Now + _TimeToLive;
var RDLength = (DNSStream.ReadByte() & byte.MaxValue) << 8 | DNSStream.ReadByte() & byte.MaxValue;
}
private ADNSResourceRecord ReadResourceRecord(Stream DNSStream)
{
var ResourceName = DNSTools.ExtractName(DNSStream);
var TypeId = (UInt16)((DNSStream.ReadByte() & Byte.MaxValue) << 8 | DNSStream.ReadByte() & Byte.MaxValue);
ConstructorInfo Constructor;
if (_RRLookup.TryGetValue(TypeId, out Constructor))
{
return((ADNSResourceRecord)Constructor.Invoke(new Object[2] {
ResourceName,
DNSStream
}));
}
Debug.WriteLine("Unknown DNS resource record '" + TypeId + "' for '" + ResourceName + "' received!");
return(null);
}
public SSHFP(String Name,
Stream Stream)
: base(Name, TypeId, Stream)
{
this._Algorithm = (SSHFP_Algorithm)(Stream.ReadByte() & Byte.MaxValue);
this._Typ = (SSHFP_FingerprintType)(Stream.ReadByte() & Byte.MaxValue);
switch (this._Typ)
{
case SSHFP_FingerprintType.SHA1:
this._Fingerprint = BitConverter.ToString(DNSTools.ExtractByteArray(Stream, 20));
break;
case SSHFP_FingerprintType.SHA256:
this._Fingerprint = BitConverter.ToString(DNSTools.ExtractByteArray(Stream, 32));
break;
}
}
public TXT(Stream Stream)
: base(Stream, TypeId)
{
this._Text = DNSTools.ExtractName(Stream);
}
private DNSInfo ReadResponse(IPSocket Origin, Int32 ExpectedTransactionId, Stream DNSBuffer)
{
#region DNS Header
var RequestId = ((DNSBuffer.ReadByte() & Byte.MaxValue) << 8) + (DNSBuffer.ReadByte() & Byte.MaxValue);
if (ExpectedTransactionId != RequestId)
{
throw new Exception("Security Alert: Mallory might send us faked DNS replies! [" + ExpectedTransactionId + " != " + RequestId + "]");
}
var Byte2 = DNSBuffer.ReadByte();
var IS = (Byte2 & 128) == 128;
var OpCode = (Byte2 >> 3 & 15);
var AA = (Byte2 & 4) == 4;
var TC = (Byte2 & 2) == 2;
var RD = (Byte2 & 1) == 1;
var Byte3 = DNSBuffer.ReadByte();
var RA = (Byte3 & 128) == 128;
var Z = (Byte3 & 1); //reserved, not used
var ResponseCode = (DNSResponseCodes)(Byte3 & 15);
var QuestionCount = ((DNSBuffer.ReadByte() & Byte.MaxValue) << 8) | (DNSBuffer.ReadByte() & Byte.MaxValue);
var AnswerCount = ((DNSBuffer.ReadByte() & Byte.MaxValue) << 8) | (DNSBuffer.ReadByte() & Byte.MaxValue);
var AuthorityCount = ((DNSBuffer.ReadByte() & Byte.MaxValue) << 8) | (DNSBuffer.ReadByte() & Byte.MaxValue);
var AdditionalCount = ((DNSBuffer.ReadByte() & Byte.MaxValue) << 8) | (DNSBuffer.ReadByte() & Byte.MaxValue);
#endregion
//ToDo: Does this make sense?
#region Process Questions
DNSBuffer.Seek(12, SeekOrigin.Begin);
for (var i = 0; i < QuestionCount; ++i)
{
var QuestionName = DNSTools.ExtractName(DNSBuffer);
var TypeId = (UInt16)((DNSBuffer.ReadByte() & Byte.MaxValue) << 8 | DNSBuffer.ReadByte() & Byte.MaxValue);
var ClassId = (DNSQueryClasses)((DNSBuffer.ReadByte() & Byte.MaxValue) << 8 | DNSBuffer.ReadByte() & Byte.MaxValue);
}
#endregion
var Answers = new List <ADNSResourceRecord>();
var Authorities = new List <ADNSResourceRecord>();
var AdditionalRecords = new List <ADNSResourceRecord>();
for (var i = 0; i < AnswerCount; ++i)
{
Answers.Add(ReadResourceRecord(DNSBuffer));
}
for (var i = 0; i < AuthorityCount; ++i)
{
Authorities.Add(ReadResourceRecord(DNSBuffer));
}
for (var i = 0; i < AdditionalCount; ++i)
{
AdditionalRecords.Add(ReadResourceRecord(DNSBuffer));
}
return(new DNSInfo(Origin, RequestId, AA, TC, RD, RA, ResponseCode, Answers, Authorities, AdditionalRecords));
}
