Telnet Sequence Negotiation

From	Michael Griffin <mrmisticismo@hotmail.com>
Newsgroups	comp.programming
Subject	Telnet Sequence Negotiation
Date	2015-05-28 03:18 -0500
Organization	n/a
Message-ID	<mk6ivg$cnj$1@speranza.aioe.org> (permalink)

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 > I'm thinking in particular after having said "IAC WILL <FOO>", and
 > receiving a "IAC DO <FOO>",  can I later sao "IAC WONT <FOO>" to stop
 > FOOing?  And when I do that, will I receive an acknowledgement?
 >
 > Another way to ask this is:
 > If I received a "IAC DO <FOO>" after a "IAC WILL <FOO>", the other side
 > has the ability to change its mind "IAC DON'T <FOO>".  When they do
 > that, should I reply with "IAC WON'T <FOO>", or just silently accept the
 > new state of affairs?
 >
 > I think I realized the answer: If I receive a command that changes my
 > state, then I should acknowledge with the new state.  Defensive
 > programming says I shouldn't expect an acknowledgement, but handle one
 > cleanly.
 >
 > If I disable an option changes my handling of the data stream, I
 > shouldn't disable the processing until the byte after the response of
 > IAC DON'T/WON'T.
 >

Lets see if this reply will post this time :)

https://support.microsoft.com/en-us/kb/231866  even through it's 
Microsoft, it has a very good layout of the negotiation sequences.

Scroll down to the middle of the page where the heading is:

Associated with each of the these commands are various possible responses:

Basically if you send a DO or DON'T and get a reply, then you should 
change the settings according to the response.

But you want to track responses sent, vs responses received.  you don't 
want an endless loop of you -> Them -> you -> them again.

If you send a query, get a response for that item, then cut it there.
If you receive query, reply back, then cut it there.

Mike
telnet://htc.zapto.org

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Telnet Sequence Negotiation Michael Griffin <mrmisticismo@hotmail.com> - 2015-05-28 03:18 -0500
  Re: Telnet Sequence Negotiation Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2015-05-28 21:30 -0700
    Re: Telnet Sequence Negotiation Michael Griffin <mrmisticismo@hotmail.com> - 2015-05-28 23:35 -0500
    Re: Telnet Sequence Negotiation Michael Griffin <mrmisticismo@hotmail.com> - 2015-05-28 23:35 -0500

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