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000349_news@columbia.edu_Mon Dec 5 15:07:06 1994.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Dial out problem with Solaris 2.3
Date: 5 Dec 1994 15:07:06 GMT
Organization: Columbia University
Lines: 27
Message-Id: <3bvaaq$ibl@apakabar.cc.columbia.edu>
References: <94120257161@microserve.com>
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Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <94120257161@microserve.com>,
Byron Chandler <Byron.Chandler@Microserve.com> wrote:
>I'm having a problem with kermit on a Sparcstation 2 with Solaris 2.3. I
>have a serial line set up with the admintool's serial port manager for a
>bidirectional modem. It works fine with dial ins. By the way, the modem is
>a Telebit T2500.) Problems arise when I go to dial out.
>
UNIX bidirectional ttys are a big problem for C-Kermit. That's because
every version of UNIX, and every release of every version, handles this issue
differently. It's no surprise that tip and/or cu on a particular UNIX
version, such as Solaris 2.3, handle bidirectional ttys OK, because these
are vendor-provided utilities. They are probably also installed suid to
root or somesuch.
There is no way C-Kermit, which runs on over 400 different UNIX variations,
can account for bidirectional ttys on all of them (or for that matter, any
of them!) without introducing thousands of lines of code, security risks, and
insurmountable maintenance headaches.
The standard advice (found in all the relevant documentation) is: before
using C-Kermit to dial out on a bidirectional tty, use your system utilities
to make it non-bidirectional. For example, make a shell script wrapper that
kills the getty and restarts init, or that runs admintool, or whatever, then
runs Kermit, and then when Kermit exits, puts the line back the way it was.
- Frank