/// <summary>
/// Constructor. Initializes and binds the Socket class
/// </summary>
public UdpTransport(SnmpMessenger messengerSession)
{
this._session = messengerSession;
_socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Any, 0);
EndPoint ep = (EndPoint)ipEndPoint;
_socket.Bind(ep);
}
/// <summary>
/// Removes the Hdlc Transparency from a List of Byte
/// </summary>
/// <param name="Bytes">The List of Byte to remove the Hdlc Transparency from</param>
/// <param name="IncludeHdlcFields">Specifies the Hdlc Fields retrieved should be included in the the returned Bytes</param>
/// <returns>A List of Bytes which have been decoded from a Transparent state</returns>
public static List <byte> PmppDecode(this List <byte> Bytes, bool IncludeHdlcFields, Transport.SnmpMessenger messengerSession)
{
if (Bytes.Count == 0)
{
return(Bytes);
}
if (Bytes.First() != 0x7e && Bytes.Last() != 0x7e)
{
int firstByte = Bytes.IndexOf(PMPP);
int lastByte = Bytes.LastIndexOf(PMPP);
if (firstByte == lastByte)
{
//offsets are the same....
return(Bytes);
}
Bytes = Bytes.GetRange(firstByte, lastByte);
}
//Removes PMPP Frameing Chars
Bytes.RemoveAt(0);
Bytes.RemoveAt(Bytes.Count - 1);
//Remove Transparency
Int32 Position = 0;
List <byte> Decoded = new List <byte>();
if (!Bytes.Any(b => b == PMPP || b == PMPP_ESCAPE))
{
Decoded.AddRange(Bytes);
}
else
{
for (int end = Bytes.Count; Position < end; ++Position)
{
if (Bytes[Position] == PMPP_ESCAPE)
{
if (Bytes[Position + 1] == 0x5e)
{
Decoded.Add(PMPP);
++Position;
}
else if (Bytes[Position + 1] == 0x5d)
{
Decoded.Add(PMPP_ESCAPE);
++Position;
}
}
else
{
Decoded.Add(Bytes[Position]);
}
}
}
//Get Checksum
List <byte> Checksum = Decoded.GetRange(Decoded.Count - 2, 2);
//Remove Checksum from the working range
Decoded.RemoveRange(Decoded.Count - 2, 2);
//Calculate a Crc16 on the InformationPayload
Crc16 alg = new Crc16();
alg.ComputeHash(Decoded.ToArray());
int?packetChecksum = System.Net.IPAddress.NetworkToHostOrder(BitConverter.ToUInt16(Checksum.ToArray(), 0));
int?pseudoChecksum = System.Net.IPAddress.HostToNetworkOrder((int)alg.CrcValue);
alg = null;
Checksum = null;
//Compare Checksums
if (packetChecksum != pseudoChecksum)
{
if (null != messengerSession)
{
messengerSession.PmppCrcErrors++;
}
}
packetChecksum = null;
pseudoChecksum = null;
//back at the beginning to decode the Hdlc fields
Position = 0;
List <byte> HdlcAddress = new List <byte>();
Byte? HdlcControlField;
List <byte> HdlcProtocolIdentifier = new List <byte>();
HdlcAddress = GetHdlcField(ref Decoded, ref Position);
HdlcControlField = Bytes[Position++];
HdlcProtocolIdentifier = GetHdlcField(ref Decoded, ref Position);
if (!IncludeHdlcFields)
{
//Remove the fields we retrieved
Decoded.RemoveRange(0, Position);
}
HdlcAddress = null;
HdlcControlField = null;
HdlcProtocolIdentifier = null;
Bytes.Clear();
Bytes.AddRange(Decoded);
return(Bytes);
}
public static List <byte> PmppEncode(this List <byte> InformationPayload, Transport.SnmpMessenger messengerSession)
{
return(PmppEncode(InformationPayload, messengerSession.PmppEndPoint.Value.Address, messengerSession.PmppEndPoint.Value.Control, messengerSession.PmppEndPoint.Value.ProtocolIdentifier));
}
public TcpTransport(SnmpMessenger messengerSession, TcpClient existingClient)
{
this._session = messengerSession;
this._client = existingClient;
}
/// <summary>
/// Constructor. Initializes and binds the Socket class
/// </summary>
public TcpTransport(SnmpMessenger messengerSession)
{
this._session = messengerSession;
}
public UdpTransport(SnmpMessenger messengerSession, UdpClient existingClient)
{
this._session = messengerSession;
this._socket = existingClient.Client;
}