/// <summary>
/// Converts a ASN.1 Encoded Variable to a System UInt32
/// </summary>
/// <returns>A System UInt32 from the Encoded Value</returns>
public UInt32 ToUInt32()
{
List <byte> raw = ToBytes();
int position = 0;
return(BasicEncodingRules.DecodeUInteger32(ref raw, ref position));
}
/// <summary>
/// Converts a ASN.1 ObjectIdentifier to a System String
/// </summary>
/// <returns></returns>
public string ToObjectIdentifier()
{
int pos = 0;
List <byte> tlv = ToBytes();
return(BasicEncodingRules.DecodeObjectId(ref tlv, ref pos));
}
/// <summary>
/// Converts a ASN.1 Encoded Variable to a System String
/// </summary>
/// <returns></returns>
public override String ToString()
{
List <byte> raw = ToBytes();
int position = 0;
return(BasicEncodingRules.DecodeOctetString(BasicEncodingRules.DecodeOctetString(ref raw, ref position)));
}
/// <summary>
/// Constructs a Managed Protocol Data Unit from a List of Byte
/// </summary>
/// <param name="Pdu">The List of Byte to Construct a Protocol Data Unit from</param>
public ProtocolDataUnit(List <byte> SnmpPacket)
{
int Pos = 0;
int End = BasicEncodingRules.DecodeLength(ref SnmpPacket, ref Pos, SnmpType.Sequence);
Version = BasicEncodingRules.DecodeInteger32(ref SnmpPacket, ref Pos);
CommunityName = BasicEncodingRules.DecodeOctetString(BasicEncodingRules.DecodeOctetString(ref SnmpPacket, ref Pos));
PduType = (SnmpType)SnmpPacket[Pos];
BasicEncodingRules.DecodeLength(ref SnmpPacket, ref Pos, PduType);
RequestId = (int)BasicEncodingRules.DecodeInteger32(ref SnmpPacket, ref Pos);
ErrorStatus = (ErrorStatus)BasicEncodingRules.DecodeInteger32(ref SnmpPacket, ref Pos);
ErrorIndex = (int)BasicEncodingRules.DecodeInteger32(ref SnmpPacket, ref Pos);
//Gets PDU Length
int pduLeng = BasicEncodingRules.DecodeLength(ref SnmpPacket, ref Pos, SnmpType.Sequence);
if (Pos >= End)
{
return;
}
Bindings = new List <Variable>();
while (Pos < End)
{
try
{
BasicEncodingRules.DecodeLength(ref SnmpPacket, ref Pos, SnmpType.Sequence);
Bindings.Add(BasicEncodingRules.DecodeSequence(ref SnmpPacket, ref Pos));
}
catch
{
throw;
}
}
}
/// <summary>
/// Creates a Type, Length, Value (TLV) from this Variable instance
/// </summary>
/// <returns>The bytes which represent this Variable as a TLV</returns>
public List <byte> ToBytes()
{
List <byte> TLV = new List <byte>();
TLV.Add((byte)TypeCode);
TLV.AddRange(BasicEncodingRules.EncodeLength(Length));
TLV.AddRange(Value);
return(TLV);
}
/// <summary>
/// Encodes a Binary Sequence from a List of Variables
/// </summary>
/// <param name="Bindings">The Variable to create a Binary Sequence from</param>
/// <returns>A Binary Sequence</returns>
public static List <byte> EncodeSequence(List <Variable> Bindings)
{
List <byte> _Sequence = new List <byte>();
Bindings.ForEach(vb => _Sequence.AddRange(vb.ToSequence()));
List <byte> Sequence = new List <byte>();
Sequence.AddRange(BasicEncodingRules.EncodeSequence(SnmpType.Sequence, ref _Sequence, true));
_Sequence = null;
return(Sequence);
}
/// <summary>
/// Creates a Byte Sequence From this Variable
/// </summary>
/// <param name="SequenceType">The Type of the Sequence</param>
/// <returns>The bytes which represent this variable as a Sequence</returns>
public List <byte> ToSequence(SnmpType?SequenceType)
{
SequenceType = SequenceType ?? SnmpType.Sequence;
List <byte> _Sequence = new List <byte>();
_Sequence.AddRange(BasicEncodingRules.EncodeObjectId(Identifier));
_Sequence.AddRange(this.ToBytes());
List <byte> Sequence = BasicEncodingRules.EncodeSequence(SequenceType.Value, ref _Sequence, true);
_Sequence = null;
return(Sequence);
}
/// <summary>
/// Creates a Varaible from a List of bytes
/// </summary>
/// <param name="bytes">The List of bytes</param>
/// <returns>A Variable constructs from the given bytes</returns>
public static Variable FromBytes(List <byte> bytes)
{
int position = 0;
Variable result = new Variable();
if (bytes[position].ToSnmpType() == SnmpType.ObjectIdentifier)
{
result.Identifier = BasicEncodingRules.DecodeObjectId(ref bytes, ref position);
}
result.TypeCode = bytes[position].ToSnmpType();
int Length = BasicEncodingRules.DecodeLength(ref bytes, ref position, result.TypeCode);
result.Value = bytes.GetRange(position, Length);
return(result);
}
/// <summary>
/// Converts a ASN.1 Encoded DateTime to a System DateTime
/// </summary>
/// <returns></returns>
public DateTime ToDateTime()
{
try
{
List <byte> raw = ToBytes();
int position = 0;
uint value = BasicEncodingRules.DecodeUInteger32(ref raw, ref position, TypeCode);
//use 1, 1, 0 until when we figure out why im 2 hrs off.
return((new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddSeconds(value));
}
catch
{
//Maybe return Not a Date Time somehow?
throw;
}
}
/// <summary>
/// Constructs the byte representation of the ProtocolDataUnit
/// </summary>
/// <returns>A Byte List which represents the ProtocolDataUnit</returns>
public List <byte> ToPdu()
{
List <byte> Pdu = new List <byte>();
List <byte> _RequestId = BasicEncodingRules.EncodeInteger32(this.RequestId);
List <byte> _ErrorStatus = BasicEncodingRules.EncodeInteger32((int)this.ErrorStatus);
List <byte> _ErrorIndex = BasicEncodingRules.EncodeInteger32(this.ErrorIndex);
List <byte> _Bindings = BasicEncodingRules.EncodeSequence(this.Bindings);
Pdu.AddRange(_RequestId);
Pdu.AddRange(_ErrorStatus);
Pdu.AddRange(_ErrorIndex);
Pdu.AddRange(_Bindings);
Pdu.InsertRange(0, BasicEncodingRules.EncodeSequenceHeader(PduType, Pdu.Count, true));
Pdu.TrimExcess();
return(Pdu);
}
/// <summary>
/// Constructs the byte representation of the SnmpPacket
/// </summary>
/// <returns>A Byte List which represents this ProtocolDataUnit as a SnmpPacket</returns>
public List <byte> ToPacket(PmppEndPoint?EndPoint)
{
try
{
List <byte> Bytes = new List <byte>();
Bytes.AddRange(BasicEncodingRules.EncodeInteger32(this.version));
Bytes.AddRange(BasicEncodingRules.EncodeOctetString(this.CommunityName));
Bytes.AddRange(ToPdu());
Bytes.InsertRange(0, BasicEncodingRules.EncodeSequenceHeader(SnmpType.Sequence, Bytes.Count, true));
Bytes.TrimExcess();
if (EndPoint.HasValue)
{
Bytes = Bytes.PmppEncode(EndPoint.Value.Address, EndPoint.Value.Control, EndPoint.Value.ProtocolIdentifier);
}
return(Bytes);
}
catch
{
throw;
}
}
/// <summary>
/// Creates a Null Variable
/// </summary>
/// <returns>A Null Variable</returns>
public static Variable CreateNull()
{
return(Variable.FromBytes(BasicEncodingRules.EncodeNull(true)));
}
/// <summary>
/// Creates a OctetString Variable
/// </summary>
/// <param name="value">The System.string Value of the Variable</param>
/// <returns>A OctetString Variable with the given value</returns>
public static Variable CreateOctetString(string value)
{
return(Variable.FromBytes(BasicEncodingRules.EncodeOctetString(value)));
}
/// <summary>
/// Creates a UInteger 32 Variable
/// </summary>
/// <param name="value">The System.UInteger32 Value of the Variable</param>
/// <returns>A UInteger 32 Variable with the given value</returns>
public static Variable CreateUInteger32(uint value)
{
return(Variable.FromBytes(BasicEncodingRules.EncodeUInteger32(value)));
}
