static void deserializeDNP3(ref byte[] buffer)
{
var sb = new StringBuilder("new byte[] { ");
for (var i = 0; i < buffer.Length; i++)
{
var b = buffer[i];
sb.Append(b);
if (i < buffer.Length - 1)
{
sb.Append(", ");
}
}
sb.Append(" }");
DNP3Simple.LinkLayer ll = new DNP3Simple.LinkLayer();
ll.deserialize(ref buffer);
DNP3Simple.TransportLayer tl = new DNP3Simple.TransportLayer();
tl.deserialize(ref buffer);
DNP3Simple.ApplicationLayer al = new DNP3Simple.ApplicationLayer();
al.deserialize(ref buffer);
Console.WriteLine("DNP3 Application request " + sb.ToString());
DNP3Response(ll, tl, al, ref buffer);
}
public static byte[] TransportResponse(TransportLayer tl_, ApplicationLayer al_)
{
TransportLayer tl = new TransportLayer();
tl.TransportData = al_.ApplicationData;
tl.seq = (byte)(tl_.seq + 1);
tl.FIN = 1;
tl.FIR = 1;
tl.serialize(ref tl.TransportData);
return(tl.TransportData);
}
public static byte[] LinkResponse(LinkLayer ll_, TransportLayer tl_)
{
LinkLayer ll = new LinkLayer();
ll.LinkData = tl_.TransportData;
ll.source = ll_.destination;
ll.destination = ll_.source;
ll.controlByte = ModifyControlByte(ref ll_);
ll.serialize(ref ll.LinkData);
return(ll.LinkData);
}
/*
* public void ProcessTransport(byte transportByte)
* {
* FIN = (byte)((transportByte & 0x80) >> 7);
* FIR = (byte)((transportByte & 0x40) >> 6);
* seq = (byte)((transportByte & 0x20) & 0x3F);
* }*/
public static void ProcessTransport(ref TransportLayer tl_)
{
if ((byte)(tl_.seq + 1) == 64)
{
tl_.expectedSegment = 0;
}
else
{
tl_.expectedSegment = (byte)(tl_.seq + 1);
}
//Rule 1: transport seg-series may only begin with FIR bit set.
if (tl_.isMultipleSegment)
{
if (tl_.FIR == (byte)FIRTrans.SET && tl_.segSeriesStarted == false)
{
// Transport segment series starts
tl_.segSeriesStarted = true;
}
// Rule 2: transport seg-series ends with FIN bit set.
if (tl_.FIN == (byte)FINTrans.SET && tl_.segSeriesEnded == false)
{
// Transport segment series ends
tl_.segSeriesEnded = true;
}
// Rule 3: no trans seg-series in progress and FIR not set will be discarded
if (tl_.recvdAllSegment && tl_.FIR == (byte)FIRTrans.UNSET)
{
// Do not consider the FIR bit
}
}
// Rule 4: A trans seg with FIR bit set may have any seq no 0 to 63 without regard to history
if (tl_.segSeriesStarted)
{
// Rule 5 (b): received trans seg with FIR set will discard in progress seg-series.
if (tl_.isMultipleSegment && tl_.FIR == (byte)FIRTrans.SET)
{
tl_.discard = true;
}
// Rule 5 (c): seg no. equivalent to previous is discarded
if (tl_.seq == tl_.previousSegment)
{
tl_.discard = true;
}
// Rule 5 (d): if FIR is UNSET and seq no. different then expected discard
if (tl_.FIR == (byte)FIRTrans.UNSET && (tl_.seq != tl_.expectedSegment))
{
// discard further segments and exit
tl_.discard = true;
}
}
// Rule 6: there is only one segment if FIR and FIN are set
if (tl_.FIR == (byte)FIRTrans.SET && tl_.FIN == (byte)FINTrans.SET)
{
tl_.isMultipleSegment = false;
tl_.recvdAllSegment = true;
}
// Rule 7: if all the segments are assembled then only send the payload to Application Layer
if (tl_.isMultipleSegment && tl_.FIN == (byte)FINTrans.SET && tl_.discard == false)
{
tl_.recvdAllSegment = true;
tl_.segSeriesEnded = true;
}
tl_.previousSegment = tl_.seq;
}
