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From: Charles Henrich <henrich@crh.cl.msu.edu>
Subject: Re: bin/396: telnetd problems fix.
To: rgrimes@gndrsh.aac.dev.com (Rodney W. Grimes)
Date: Sun, 14 May 1995 15:28:05 -0400 (EDT)
Cc: henrich@crh.cl.msu.edu, freebsd-bugs@FreeBSD.org
In-Reply-To: <199505140234.TAA01401@gndrsh.aac.dev.com> from "Rodney W. Grimes" at May 13, 95 07:34:45 pm
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> Could you go do just the change that Terry Lambert suggested, test it out
> for me and tell me if it fixes the problem.  If it does we can send it out
> for wide code review and commit it!  No loss of LINEMODE, and no more
> problem from broken 4.2BSD detection clients.

Our supposition was wrong for FTP Software, apparently someone isnt doing the
right thing with BINARY negotiation (My guess its FTP Software).  This
negotiation is only done when LINEMODE is compiled in, in termstat.c, if you
disable that chunk of code all works well from everywhere.  If someone could
enlighten me as to why we do that BINARY negotiation I'd be greatful.  Here is
what the telnet option negotiation looks like between a PeeCee and FreeBSD:

SEND                    RECV

DO TTYPE
DO TSPEED
DO XDISPLOC
DO NEW-ENV
DO OLD-ENV
                        WILL TTYPE
                        WONT TSPEED
                        WONT XDISPLOC
                        WONT NEW-ENV
                        WONT OLD-ENV
                        SUB TERMINAL TYPE = VT100 (paraphrasing)
WILL SUPRESS GO AHEAD
DO LINEMODE
DO ECHO
DO NAWS
WILL STATUS
DO LFLOW
                        DO SUPRESS GO AHEAD
                        WONT LINEMODE
                        WONT ECHO
                        WONT NAWS
WILL ECHO
DO BINARY
                        DONT STATUS
                        WONT LFLOW
                        DO ECHO
                        WILL BINARY

Any ideas on how to solve this mess?

-Crh

    Charles Henrich     Michigan State University     henrich@crh.cl.msu.edu

                     http://rs560.msu.edu/~henrich/