private void ProcessResponse(string response)
{
if (!_greetSent)
{
return;
}
switch (CaptureData)
{
case 1:
TransactionCommands.ProcessData(this, response);
return;
case 2:
case 3:
case 4:
AuthenticationCommands.ProcessData(this, response.Trim());
return;
}
response = response.Trim();
string command;
var data = string.Empty;
if (response.Contains(":"))
{
command = response.Substring(0, response.IndexOf(":", StringComparison.Ordinal)).ToUpper().TrimEnd();
}
else if (response.Contains(" "))
{
command = response.Substring(0, response.IndexOf(" ", StringComparison.Ordinal)).ToUpper().TrimEnd();
}
else
{
command = response.ToUpper();
}
if (command.Length != response.Length)
{
data = response.Substring(command.Length).TrimStart();
}
switch (command)
{
case "EHLO":
Transaction = null;
_protocolVersion = 2;
WriteText($"250-{Server.Options.ServerName} at your service");
if (Server.AuthLogin != null)
{
WriteText("250-AUTH LOGIN PLAIN");
}
if (!Secure && Server.Certificate != null)
{
WriteText("250-STARTTLS");
}
WriteText("250 8BITMIME");
break;
case "HELO":
Transaction = null;
_protocolVersion = 1;
WriteText($"250 {Server.Options.ServerName} at your service");
break;
case "STARTTLS":
if (Secure)
{
WriteCode(503, "5.5.1");
return;
}
if (Server.Certificate == null)
{
WriteCode(502, "5.5.1");
return;
}
WriteCode(220, "2.0.0", "Ready for TLS");
_stream = new SslStream(_innerStream, false);
Secure = true;
Encryption = ConnectionEncryption.StartTls;
((SslStream)_stream).AuthenticateAsServer(Server.Certificate, false, Server.Options.Protocols, true);
_reader = new StreamReader(_stream);
break;
case "HELP":
WriteCode(214, "2.0.0");
break;
case "AUTH":
if (_protocolVersion == 0)
{
WriteCode(503, "5.5.1", "EHLO/HELO first.");
return;
}
AuthenticationCommands.ProcessCommand(this, data);
break;
case "NOOP":
WriteCode(250, "2.0.0");
break;
case "QUIT":
WriteCode(221, "2.0.0");
Dispose();
break;
case "RSET":
case "MAIL FROM":
case "RCPT TO":
case "DATA":
if (_protocolVersion == 0)
{
WriteCode(503, "5.5.1", "EHLO/HELO first.");
return;
}
TransactionCommands.ProcessCommand(this, command, data);
break;
case "VRFY":
if (_protocolVersion == 0)
{
WriteCode(503, "5.5.1", "EHLO/HELO first.");
return;
}
WriteCode(252, "5.5.1");
break;
default:
if (_protocolVersion == 0)
{
WriteCode(503, "5.5.1", "EHLO/HELO first.");
return;
}
WriteCode(502, "5.5.1");
break;
}
}
public TransactionCommand(SQLiteConnection conn, TransactionCommands command)
{
this.conn = conn;
this.cmd = command;
}