[TUHS] 4.3BSD help: getty ignoring modem status
clemc at ccc.com
Mon Mar 20 12:25:15 AEST 2017
Eric you are digging out painful memories... he is absolutely right.
On Sun, Mar 19, 2017 at 9:25 PM, Erik E. Fair <fair-tuhs at netbsd.org> wrote:
> One more thing: it's impossible to get an 8-bit clean connection through
> TELNET protocol without speaking the TELNET protocol: even in binary mode,
> you have to escape IAC (0377, 0x7F) in transmission, and eat the IAC byte
> doubling in reception. See RFC-854.
> I wrote an implementation of TELNET specifically for the AppleLink/Internet
> E-mail gateway at Apple because we had to speak X.25 (sort of) to the GEIS
> network & mainframe, and I didn't want to buy system-specific, proprietary
> HDLC/LAPB serial gear that would lock me into a particular hardware
> so I used a Cisco protocol translator instead - it could be configured to
> a TELNET server connection to a given X.25/X.3 PAD call (akin to a terminal
> server in "milking machine" mode). Worked great, once I had that streaming
> TELNET implementation going to get binary data through the connection.
> That design left me free to run the gateway on any Unix system I felt like:
> it started on a Mac SE/30 (A/UX), moved to an SGI-4D/380 (Irix), and ended
> life on a Sun SPARCstation ... 10 or 20 (SunOS 4? Solaris? I forget). So
> as the Unix in question had TCP/IP, Berkeley sockets, a network interface
> (preferably Ethernet), sendmail(8) and perl(1), the gateway could be run on
> it. Didn't even need to be proximate to the Cisco protocol translator -
> somewhere on the same IP network. Most of the code was actually Perl 3 & 4
> because E-mail gatewaying is mostly about string manipulation.
> happy solstice!
> Erik Fair
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