/// <summary>
/// Called when the session has been authenticated.
/// </summary>
/// <param name="sender">The object that raised the event.</param>
/// <param name="eventArgs">The event data.</param>
void OnSessionAuthenticated(object sender, EventArgs eventArgs)
{
_context.SessionAuthenticated -= OnSessionAuthenticated;
WaitingForMail.Remove(AuthCommand.Command);
WaitingForMailSecure.Remove(AuthCommand.Command);
if (_context.EndpointDefinition.AuthenticationRequired)
{
WaitingForMail.Replace(MailCommand.Command, TryMakeMail, SmtpState.WithinTransaction);
WaitingForMailSecure.Replace(MailCommand.Command, TryMakeMail, SmtpState.WithinTransaction);
}
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="context">The SMTP server session context.</param>
internal SmtpStateMachine(SmtpSessionContext context)
{
_context = context;
_context.SessionAuthenticated += OnSessionAuthenticated;
_stateTable = new StateTable
{
new State(SmtpState.Initialized)
{
{ NoopCommand.Command, TryMakeNoop },
{ RsetCommand.Command, TryMakeRset },
{ QuitCommand.Command, TryMakeQuit },
{ HeloCommand.Command, TryMakeHelo, c => c.NetworkClient.Stream.IsSecure ? SmtpState.WaitingForMailSecure : SmtpState.WaitingForMail },
{ EhloCommand.Command, TryMakeEhlo, c => c.NetworkClient.Stream.IsSecure ? SmtpState.WaitingForMailSecure : SmtpState.WaitingForMail },
},
new State(SmtpState.WaitingForMail)
{
{ NoopCommand.Command, TryMakeNoop },
{ RsetCommand.Command, TryMakeRset },
{ QuitCommand.Command, TryMakeQuit },
{ HeloCommand.Command, TryMakeHelo, SmtpState.WaitingForMail },
{ EhloCommand.Command, TryMakeEhlo, SmtpState.WaitingForMail },
{ MailCommand.Command, TryMakeMail, SmtpState.WithinTransaction }
},
new State(SmtpState.WaitingForMailSecure)
{
{ NoopCommand.Command, TryMakeNoop },
{ RsetCommand.Command, TryMakeRset },
{ QuitCommand.Command, TryMakeQuit },
{ AuthCommand.Command, TryMakeAuth },
{ HeloCommand.Command, TryMakeHelo, SmtpState.WaitingForMailSecure },
{ EhloCommand.Command, TryMakeEhlo, SmtpState.WaitingForMailSecure },
{ MailCommand.Command, TryMakeMail, SmtpState.WithinTransaction }
},
new State(SmtpState.WithinTransaction)
{
{ NoopCommand.Command, TryMakeNoop },
{ RsetCommand.Command, TryMakeRset, c => c.NetworkClient.Stream.IsSecure ? SmtpState.WaitingForMailSecure : SmtpState.WaitingForMail },
{ QuitCommand.Command, TryMakeQuit },
{ RcptCommand.Command, TryMakeRcpt, SmtpState.CanAcceptData },
},
new State(SmtpState.CanAcceptData)
{
{ NoopCommand.Command, TryMakeNoop },
{ RsetCommand.Command, TryMakeRset, c => c.NetworkClient.Stream.IsSecure ? SmtpState.WaitingForMailSecure : SmtpState.WaitingForMail },
{ QuitCommand.Command, TryMakeQuit },
{ RcptCommand.Command, TryMakeRcpt },
{ DataCommand.Command, TryMakeData, SmtpState.WaitingForMail },
}
};
if (context.EndpointDefinition.AllowUnsecureAuthentication)
{
WaitingForMail.Add(AuthCommand.Command, TryMakeAuth);
}
if (context.EndpointDefinition.AuthenticationRequired)
{
WaitingForMail.Replace(MailCommand.Command, MakeResponse(SmtpResponse.AuthenticationRequired));
WaitingForMailSecure.Replace(MailCommand.Command, MakeResponse(SmtpResponse.AuthenticationRequired));
}
if (context.ServerOptions.ServerCertificate != null && context.NetworkClient.Stream.IsSecure == false)
{
WaitingForMail.Add(StartTlsCommand.Command, TryMakeStartTls, SmtpState.WaitingForMailSecure);
}
_stateTable.Initialize(SmtpState.Initialized);
}
