Subj : Re: Kannons and Katapults
To   : Mike Powell
From : Stephen Hurd
Date : Tue Dec 09 2025 00:57:40

  Re: Re: Kannons and Katapults
  By: Mike Powell to Stephen Hurd on Mon Dec 08 2025 09:10 am

 > I am a little leary to blame "old software" when the software itself has no
 > issue interpreting the tap of the enter key as "one" return... CR or LF or
 > whatever.   It seems more like a case of syncterm, etc., sending an extra
 > character when in telnet mode that older software -- i.e. most BBS software
 > that isn't Synchronet or Mystic -- doesn't know what to do with.

That's exactly what it is, but doing that is *required* by the telnet protocol under certain circumstances.

 > That might be semantics but I it is odd that using an older terminal program
 > over a telnet connection (with something like VMODEM) doesn't cause this,
 > which makes me suspect it is the modern BBS terminal programs that have
 > changed something.  I am sure the answer is "cause telnet protocol" but
 > since we are using these terminal programs to telnet into BBSes and not old
 > VAX
 > or mainframe machines, I have to wonder who thought that was necessary.

It's actually the other way around... the old things like VModem handled the telnet protocol and the door game didn't have to worry about it.  Many modern doors however are being passed the socket itself and now the door needs to support the telnet protocol and every doorkit author needs to understand the telnet protocol instead of it being handled by the VModem and only the person who is setting out to write a telnet package needs to deal with the telnet protocol.

Having the door "speak" telnet when it is passed a socket also ends up causing issues when the BBS uses SSH instead of telnet because SSH is an 8-bit-clean protocol, so all of the telnet things that a door has to do, it has to not do for SSH.

Basically it's "cause door is being passed a raw socket and has to telnet protocol itself" instead of the much more sane "telnet server does telnet, door doesn't care".
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