From mboxrd@z Thu Jan 1 00:00:00 1970 From: clemc@ccc.com (Clem Cole) Date: Sun, 19 Mar 2017 22:25:15 -0400 Subject: [TUHS] 4.3BSD help: getty ignoring modem status In-Reply-To: <12242.1489973103@cesium.clock.org> References: <24849.1489970823@cesium.clock.org> <12242.1489973103@cesium.clock.org> Message-ID: Eric you are digging out painful memories... he is absolutely right. On Sun, Mar 19, 2017 at 9:25 PM, Erik E. Fair wrote: > One more thing: it's impossible to get an 8-bit clean connection through > the > 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 > platform, > so I used a Cisco protocol translator instead - it could be configured to > map > 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 > long > 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 - > just > 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 > -------------- next part -------------- An HTML attachment was scrubbed... URL: