public TcpSession !ReInitializeSession(TcpSession !tcp)
{
tcp.ReInitialize(this);
Core.Instance().RegisterSession(this, tcp);
return(tcp);
}
// Find the relevant session for this connection
protected TcpSession FindSession(IPFormat.IPHeader !ipHeader,
ref TcpFormat.TcpHeader tcpHeader)
{
// Get the session table
ArrayList sessions = Core.Instance().GetSessions(this);
if (sessions == null)
{
return(null);
}
// First priority is a full match (Loc/Rem X Addr/Port all match),
// but next priority is a "passive" match (a Broadcast to "me").
TcpSession passiveSession = null; // this is the passive session
lock (sessions.SyncRoot) {
// BUGBUG: This should use HashTables (KeyedCollections // TODO
// BUGBUG: if we get Generics) for Performance reasons. // TODO
// BUGBUG: We need one for full and one for passive. // TODO
// BUGBUG: The full hashtable uses local and remote // TODO
// BUGBUG: addresses as the keys and can be limited to // TODO
// BUGBUG: sessions without Remote Broadcast addresses; // TODO
// BUGBUG: the passive hashtable is limited to sessions // TODO
// BUGBUG: with Remote Broadcast addresses and uses the // TODO
// BUGBUG: local address only as the key. // TODO
// BUGBUG: Note that this is done for every TCP Packet. // TODO
foreach (TcpSession !tcpSession in sessions)
{
bool matchLocal =
(tcpSession.LocalAddress == ipHeader.Destination) &&
(tcpSession.LocalPort == tcpHeader.destPort);
// Both full and passive matches require full Local match.
if (matchLocal)
{
// Check the Remote Match for a Full Match
bool matchRemote =
(tcpSession.RemoteAddress == ipHeader.Source) &&
(tcpSession.RemotePort == tcpHeader.sourcePort);
// If a full match (local && remote) return the session.
if (matchRemote)
{
return(tcpSession);
}
// Check for "Broadcast" address.
bool matchBroadcast =
(tcpSession.RemoteAddress == IPv4.Broadcast) &&
(tcpSession.RemotePort == 0);
// No full match, but save passiveSession
// if matchLocal && matchBroadcast.
if (matchBroadcast)
{
passiveSession = tcpSession;
}
}
}
}
// If we didn't find an exact match, return
// the passive match, if any (may be null).
return(passiveSession);
}