protected VariableParam readVariable()
{
int type = _body.GetUShort();
int len = _body.GetUShort();
int blen = len - 4;
//byte[] data;
Unknown var;
switch (type)
{
case 1:
var = new HeartbeatInfo(1, "HeartbeatInfo");
break;
// 2-4 Unassigned
case 5:
var = new IPv4Address(5, "IPv4Address");
break;
case 6:
var = new IPv6Address(6, "IPv6Address");
break;
case 7:
var = new StateCookie(7, "StateCookie");
break;
case 8:
var = new UnrecognizedParameters(8, "UnrecognizedParameters");
break;
case 9:
var = new CookiePreservative(9, "CookiePreservative");
break;
// 10 Unassigned
case 11:
var = new HostNameAddress(11, "HostNameAddress");
break;
case 12:
var = new SupportedAddressTypes(12, "SupportedAddressTypes");
break;
case 13:
var = new OutgoingSSNResetRequestParameter(13, "OutgoingSSNResetRequestParameter");
break;
case 14:
var = new IncomingSSNResetRequestParameter(14, "IncomingSSNResetRequestParameter");
break;
case 15:
var = new SSNTSNResetRequestParameter(15, "SSNTSNResetRequestParameter");
break;
case 16:
var = new ReconfigurationResponseParameter(16, "ReconfigurationResponseParameter");
break;
case 17:
var = new AddOutgoingStreamsRequestParameter(17, "AddOutgoingStreamsRequestParameter");
break;
case 18:
var = new AddIncomingStreamsRequestParameter(18, "AddIncomingStreamsRequestParameter");
break;
// 19-32767 Unassigned
case 32768:
var = new Unknown(32768, "ReservedforECNCapable");
break;
case 32770:
var = new RandomParam(32770, "Random");
break;
case 32771:
var = new ChunkListParam(32771, "ChunkList");
break;
case 32772:
var = new RequestedHMACAlgorithmParameter(32772, "RequestedHMACAlgorithmParameter");
break;
case 32773:
var = new Unknown(32773, "Padding");
break;
case 32776:
var = new SupportedExtensions(32776, "SupportedExtensions");
break;
// 32777-49151 Unassigned
case 49152:
var = new ForwardTSNsupported(49152, "ForwardTSNsupported");
break;
case 49153:
var = new Unknown(49153, "AddIPAddress");
break;
case 49154:
var = new Unknown(49154, "DeleteIPAddress");
break;
case 49155:
var = new Unknown(49155, "ErrorCauseIndication");
break;
case 49156:
var = new Unknown(49156, "SetPrimaryAddress");
break;
case 49157:
var = new Unknown(49157, "SuccessIndication");
break;
case 49158:
var = new Unknown(49158, "AdaptationLayerIndication");
break;
default:
var = new Unknown(-1, "Unknown");
break;
}
try
{
var.readBody(_body, blen);
//logger.LogDebug("variable type " + var.getType() + " name " + var.getName());
}
catch (SctpPacketFormatException ex)
{
logger.LogError(ex.ToString());
}
if (_body.hasRemaining())
{
int mod = blen % 4;
if (mod != 0)
{
for (int pad = mod; pad < 4; pad++)
{
_body.GetByte();
}
}
}
return(var);
}
/*
* https://tools.ietf.org/html/rfc6525
*/
public Chunk[] deal(ReConfigChunk rconf)
{
Chunk[] ret = new Chunk[1];
ReConfigChunk reply = null;
//logger.LogDebug("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 until we catch up.
if (oreset.getLastAssignedTSN() > assoc.getCumAckPt())
{
//logger.LogDebug("Last assigned > farTSN " + oreset.getLastAssignedTSN() + " v " + assoc.getCumAckPt());
foreach (int s in streams)
{
SCTPStream defstr = assoc.getStream(s);
// AC: All this call did was set an unused local variable. Removed for now.
//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.LogDebug("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.LogError("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.LogDebug("Ireset " + ireset);
}
}
if (reply.hasParam())
{
ret[0] = reply;
// todo should add sack here
//logger.LogDebug("about to reply with " + reply.ToString());
}
else
{
ret = null;
}
return(ret);
}