// Public overriden methods
//
override public SecurityAssociation CheckForSecurityAssociation(ISender sender)
{
DtlsAssociation sa = null;
_sender_to_sa.TryGetValue(sender, out sa);
return(sa);
}
// Protected methods
/// <summary></summary>
protected bool NoSuchSA(ISender return_path, int remote_id, bool start,
out DtlsAssociation sa)
{
sa = new DtlsAssociation(return_path, _ch, PType, new Ssl(_ctx), start);
sa.StateChangeEvent += SAStateChange;
sa.RemoteID = remote_id;
return(true);
}
override protected void RemoveSA(SecurityAssociation sa)
{
DtlsAssociation dsa = sa as DtlsAssociation;
if (dsa == null)
{
throw new Exception("SecurityAssociation is not a DtlsAssociation: " + sa);
}
_rwl.AcquireWriterLock(Timeout.Infinite);
_sender_to_sa.Remove(dsa.Sender);
_rwl.ReleaseWriterLock();
_it.Remove(dsa.LocalID);
}
override public SecurityAssociation CreateSecurityAssociation(ISender sender)
{
DtlsAssociation sa = null;
if (_sender_to_sa.TryGetValue(sender, out sa))
{
return(sa);
}
if (NoSuchSA(sender, 0, true, out sa))
{
DtlsAssociation tmpsa = sa;
bool close = false;
lock (_sender_to_sa) {
if (_sender_to_sa.TryGetValue(sender, out sa))
{
close = true;
}
else
{
_sender_to_sa.Add(sender, tmpsa);
}
}
if (close)
{
tmpsa.Close("Duplicate");
}
else
{
sa = tmpsa;
_it.Add(sa);
sa.Subscribe(this, null);
sa.Handshake();
}
}
return(sa);
}
