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From: brian@awfulhak.demon.co.uk (Brian Somers)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: telnet wierdness... bug ?
Date: 7 Jun 1996 14:39:29 +0100
Organization: Coverform Ltd.
Lines: 43
Message-ID: <4p9beh$15t@anorak.coverform.lan>
X-NNTP-Posting-Host: awfulhak.demon.co.uk
X-Newsreader: TIN [version 1.2 PL2]
Verrrrrry strange ! I've written the following script called ppptimeout:
#! /bin/sh
netstat -na | fgrep .3000 >/dev/null || {
echo ppp isn\'t running >&2
exit
}
telnet localhost 3000 <<eof
set timeout $1
quit
eof
Nothing complicated. I've got ppp -auto running with a timeout of 900
seconds. At night, I connect to the internet, exchange news & mail and
disconnect. Things are set up so that all cron has to do is ping (I've
hacked ppp to run /etc/ppp/ppp.etherup after connection), then timeout.
When I connect manually, I want a 900 second timeout. I want auto-connects
to be only 30 seconds - hence the script. This script (after adding a
couple of >/dev/null's) will do the job - I THOUGHT !
The result ?
telnet quits before reading & sending the 'set timeout' bit to socket
3000 - because it has already read the EOF. This can be proven by
running telnet from a file equivalent to the above, except the file has
100000 linefeeds at the end - it works.
I would _almost_ assert that this is a bug. I can't figure what's going
on except that stdin is buffered (512 bytes?) and telnet is doing a read
and figuring that it's seen EOF before actually processing the read buffer.
It's the same under 'sh' and 'bash'. It's being run on a 2.1-RELEASE
machine. Doing the telnet manually works (of course).
Any help or suggestions ? TIA.
--
Brian <brian@awfulhak.demon.co.uk>
Don't _EVER_ lose your sense of humour....