public void setUp()
{
DatagramTransport _fakedt = new DatagramTransportImpl();
_fakeAssociation = new AssociationImpl(_fakedt, null);
_fakeStream = new SCTPStreamImpl(_fakeAssociation, 22);
}
public SCTPMessage(SCTPStream s, SortedArray <DataChunk> chunks)
{
_stream = s;
int tot = 0;
if ((chunks.First.getFlags() & DataChunk.BEGINFLAG) == 0)
{
throw new Exception("[IllegalArgumentException] must start with 'start' chunk");
}
if ((chunks.Last.getFlags() & DataChunk.ENDFLAG) == 0)
{
throw new Exception("[IllegalArgumentException] must end with 'end' chunk");
}
_pPid = chunks.First.getPpid();
foreach (DataChunk dc in chunks)
{
tot += dc.getDataSize();
if (_pPid != dc.getPpid())
{
// aaagh
throw new Exception("[IllegalArgumentException] chunk has wrong ppid" + dc.getPpid() + " vs " + _pPid);
}
}
_data = new byte[tot];
int offs = 0;
foreach (DataChunk dc in chunks)
{
Array.Copy(dc.getData(), 0, _data, offs, dc.getDataSize());
offs += dc.getDataSize();
}
}
public void closeStream(SCTPStream st)
{
Chunk[] cs = new Chunk[1];
if (canSend())
{
Logger.Debug("due to reconfig stream " + st);
cs[0] = reconfigState.makeClose(st);
}
this.send(cs);
}
public SCTPMessage(SCTPStream s, DataChunk singleChunk)
{
_stream = s;
int flags = singleChunk.getFlags();
if ((flags & DataChunk.SINGLEFLAG) > 0)
{
_data = singleChunk.getData();
_pPid = singleChunk.getPpid();
}
else
{
throw new Exception("[IllegalArgumentException] must use a 'single' chunk");
}
}
/* we can only demand they close their outbound streams */
/* we can request they start to close inbound (ie ask us to shut our outbound */
/* DCEP treats streams as bi-directional - so this is somewhat of an inpedance mis-match */
/* resulting in a temporary 'half closed' state */
/* mull this over.... */
public ReConfigChunk makeClose(SCTPStream st)
{
ReConfigChunk ret = null;
Logger.Debug("building reconfig so close stream " + st);
st.setClosing(true);
lock (listOfStreamsToReset) {
listOfStreamsToReset.Enqueue(st);
}
if (!timerIsRunning())
{
ret = makeSSNResets();
}
return(ret);
}
// todo should be in a behave block
// then we wouldn't be messing with stream seq numbers.
private Chunk[] dcepDeal(SCTPStream s, DataChunk dc, DCOpen dcep)
{
Chunk[] rep = null;
Logger.Debug("dealing with a decp for stream " + dc.getDataAsString());
if (!dcep.isAck())
{
Logger.Debug("decp is not an ack... ");
SCTPStreamBehaviour behave = dcep.mkStreamBehaviour();
s.setBehave(behave);
s.setLabel(dcep.getLabel());
lock (s) {
int seqIn = s.getNextMessageSeqIn();
s.setNextMessageSeqIn(seqIn + 1);
int seqOut = s.getNextMessageSeqOut();
s.setNextMessageSeqOut(seqOut + 1);
}
rep = new Chunk[1];
DataChunk ack = dc.mkAck(dcep);
s.outbound(ack);
ack.setTsn(_nearTSN++);
// check rollover - will break at maxint.
rep[0] = ack;
}
else
{
Logger.Debug("got a dcep ack for " + s.getLabel());
SCTPStreamBehaviour behave = dcep.mkStreamBehaviour();
s.setBehave(behave);
lock (s) {
int seqIn = s.getNextMessageSeqIn();
s.setNextMessageSeqIn(seqIn + 1);
int seqOut = s.getNextMessageSeqOut();
s.setNextMessageSeqOut(seqOut + 1);
}
}
return(rep);
}
public SCTPMessage(string data, SCTPStream s)
{
_data = (data.Length > 0) ? System.Text.Encoding.ASCII.GetBytes(data) : new byte[1];
_stream = s;
_pPid = (data.Length > 0) ? DataChunk.WEBRTCstring : DataChunk.WEBRTCstringEMPTY;
}
/**
* Outbound message - note that we assume no one will mess with data between
* calls to fill()
*
* @param data
* @param s
*/
public SCTPMessage(byte[] data, SCTPStream s)
{
_data = (data.Length > 0) ? data : new byte[1];
_stream = s;
_pPid = (data.Length > 0) ? DataChunk.WEBRTCBINARY : DataChunk.WEBRTCBINARYEMPTY;
}
/*
* https://tools.ietf.org/html/rfc6525
*/
public Chunk[] deal(ReConfigChunk rconf)
{
Chunk[] ret = new Chunk[1];
ReConfigChunk reply = null;
Logger.Debug("Got a reconfig message to deal with");
if (haveSeen(rconf))
{
// if not - is this a repeat
reply = getPrevious(rconf); // then send the same reply
}
if (reply == null)
{
// not a repeat then
reply = new ReConfigChunk(); // create a new thing
if (rconf.hasOutgoingReset())
{
OutgoingSSNResetRequestParameter oreset = rconf.getOutgoingReset();
int[] streams = oreset.getStreams();
if (streams.Length == 0)
{
streams = assoc.allStreams();
}
if (timerIsRunning())
{
markAsAcked(rconf);
}
// if we are behind, we are supposed to wait untill we catch up.
if (oreset.getLastAssignedTSN() > assoc.getCumAckPt())
{
Logger.Debug("Last assigned > farTSN " + oreset.getLastAssignedTSN() + " v " + assoc.getCumAckPt());
foreach (int s in streams)
{
SCTPStream defstr = assoc.getStream(s);
defstr.setDeferred(true);
}
ReconfigurationResponseParameter rep = new ReconfigurationResponseParameter();
rep.setSeq(oreset.getReqSeqNo());
rep.setResult(ReconfigurationResponseParameter.IN_PROGRESS);
reply.addParam(rep);
}
else
{
// somehow invoke this when TSN catches up ?!?! ToDo
Logger.Debug("we are up-to-date ");
ReconfigurationResponseParameter rep = new ReconfigurationResponseParameter();
rep.setSeq(oreset.getReqSeqNo());
int result = streams.Length > 0 ? ReconfigurationResponseParameter.SUCCESS_PERFORMED : ReconfigurationResponseParameter.SUCCESS_NOTHING_TO_DO;
rep.setResult((uint)result); // assume all good
foreach (int s in streams)
{
SCTPStream cstrm = assoc.delStream(s);
if (cstrm == null)
{
Logger.Error("Close a non existant stream");
rep.setResult(ReconfigurationResponseParameter.ERROR_WRONG_SSN);
break;
// bidriectional might be a problem here...
}
else
{
cstrm.reset();
}
}
reply.addParam(rep);
}
}
// ponder putting this in a second chunk ?
if (rconf.hasIncomingReset())
{
IncomingSSNResetRequestParameter ireset = rconf.getIncomingReset();
/*The Re-configuration
* Response Sequence Number of the Outgoing SSN Reset Request
* Parameter MUST be the Re-configuration Request Sequence Number
* of the Incoming SSN Reset Request Parameter. */
OutgoingSSNResetRequestParameter rep = new OutgoingSSNResetRequestParameter(nextNearNo(), ireset.getReqNo(), assoc.getNearTSN());
int[] streams = ireset.getStreams();
rep.setStreams(streams);
if (streams.Length == 0)
{
streams = assoc.allStreams();
}
foreach (int s in streams)
{
SCTPStream st = assoc.getStream(s);
if (st != null)
{
st.setClosing(true);
}
}
reply.addParam(rep);
// set outbound timer running here ???
Logger.Debug("Ireset " + ireset);
}
}
if (reply.hasParam())
{
ret[0] = reply;
// todo should add sack here
Logger.Debug("about to reply with " + reply.ToString());
}
else
{
ret = null;
}
return(ret);
}
public ReConfigChunk addToCloseList(SCTPStream st)
{
return(reconfigState.makeClose(st));
}