internal override void unknownReceived(Session session, bool authentic = false)
{
invalidMessage(session);
}
internal override void btm2btmReceived(Session session, bool authentic = false)
{
if (authentic != true)
return;
session.deployBtm2Btm();
}
internal override void krypt2kryptReceived(Session session, bool authentic = false)
{
session.deployKrypt2Krypt();
}
internal override void securityStatusChanged(Session session)
{
//check if session has gone secure
if (session.isSecure != true)
{
//this should never happen
session._tearDown();
}
session.changeState(Routing.Instance(session));
}
internal static State Instance(Session session)
{
session.initBottomProtocol(session.startedProtocol);
return state;
}
internal override void ackReceived(Session session, bool authentic = false)
{
changeState(session, SessionConfirmed.Instance(session));
}
internal override void synReceived(Session session, bool authentic = false)
{
//TODO: version checks here
session.sendACK();
changeState(session, SessionConfirmed.Instance(session));
}
/// <summary>
/// Starts a protocol run.
/// </summary>
/// <param name="session">The corresponding session.</param>
internal virtual void startProtocol(Session session)
{
invalidMessage(session);
}
/// <summary>
/// Called when a SYN message is received.
/// </summary>
/// <param name="session">The corresponding session.</param>
/// <param name="authentic">Flag indicating whether the received message was properly signed.</param>
internal virtual void synReceived(Session session, bool authentic = false)
{
invalidMessage(session);
}
/// <summary>
/// Default handler for non protocol-conform events.
/// Ends the respective protocol run.
/// </summary>
/// <param name="session">Corresponding Surface protocol run.</param>
internal virtual void invalidMessage(Session session)
{
session._tearDown();
}
/// <summary>
/// Called whenever the security status of a session has changed.
/// </summary>
/// <param name="session">The corresponding session.</param>
internal virtual void securityStatusChanged(Session session)
{
session._tearDown();
}
/// <summary>
/// Ends a protocol run.
/// </summary>
/// <param name="session">The corresponding session.</param>
internal void endProtocol(Session session)
{
session.sendCLOSING();
session._tearDown();
}
/// <summary>
/// Called when a CLOSING message is received.
/// </summary>
/// <param name="session">The corresponding session.</param>
/// <param name="authentic">Flag indicating whether the received message was properly signed.</param>
internal virtual void closingReceived(Session session, bool authentic = false)
{
session._tearDown();
}
/// <summary>
/// Default function for a state-transition.
/// </summary>
/// <param name="session">Corresponding Surface protocol run.</param>
/// <param name="state">Next state.</param>
internal virtual void changeState(Session session, State state)
{
session.changeState(state);
}
internal static State Instance(Session session)
{
if (session.isSecure == true)
{
return Routing.Instance(session);
}
else
{
//need to do a key-exchange before we can start routing
return ExchangingKeys.Instance(session);
}
}
internal static State Instance(Session session)
{
session.initKryptoniteProtocol(session.startedProtocol);
return state;
}
internal static State Instance(Session session)
{
return state;
}
internal override void krypt2kryptReceived(Session session, bool authentic = false)
{
//no auth-check in this state of the protocol
session.deployKrypt2Krypt();
}
//since NACK is al valid message for this state, it is implemented explicitly
internal override void nackReceived(Session session, bool authentic = false)
{
session._tearDown();
}
internal override void startProtocol(Session session)
{
session.sendSYN();
changeState(session, WaitingForACK.Instance(session));
}