How to configure dialup SLIP

[ formerly in section 1.606 part 5 ]

#!/bin/ksh

# SLIP login .profile
# Adapted from comp.unix.aix FAQ
# by Davide Migliavacca (davide.migliavacca@inferentia.it)
# $Revision: 1.14 $

# Set this variable != 0 to allow multiple logins from this userid

ALLOW_MULTIPLE_LOGINS=0

# NOTE: script currently determines destination IP address from the SLIP
# interface attributes, but it assumes a correspondence
# ttyxx <-> slipxx
# (see the "IPADDRESS=" awk line)
# It relies on a client being able to read the IP address from
# the logon procedure output.


PATH=/usr/bin:/etc:/usr/sbin:/usr/ucb:$HOME/bin:/usr/bin/X11:/sbin:/usr/local/bin:.

export PATH ENV HISTSIZE
#
# Search for a LCK-File for our tty if there is one
#
TTYDEV=`tty`
TTYBASENAME=`basename $TTYDEV`
TTYNUMBER=`echo $TTYBASENAME | sed -n -e "s/tty\([0-9]\{1,\}\)/\1/p"`

if [ -f /etc/locks/LCK..$TTYBASENAME ];
then SHPID=`cat /etc/locks/LCK..$TTYBASENAME`;
else {
/usr/bin/logger -t SLIP -p error "No LCK file for $TTYDEV"
exit 64;
}
fi;


# Search for another login from this userid

OTHERSLIP=`ps -fu$USER |
sed -n -e "s/^ *$USER *[0-9][0-9]* .*-.*\/usr\/sbin\/slattach \(tty[0-9]\{1,\}\) *$/\1/p`;
if [ ! -z "$OTHERSLIP" ];
then
if [ $ALLOW_MULTIPLE_LOGINS -eq 0 ];
then
echo "Sorry, you are already connected to $OTHERSLIP.";
echo "Multiple logins are NOT allowed.";
echo "For any question, contact helpdesk@inferentia.it";
/usr/bin/logger -t SLIP -p warn "$USER: attempt to connect on $TTYBASENAME when already connected on $OTHERSLIP - refused";
exit 64;
fi
#else...
/usr/bin/logger -t SLIP -p warn "$USER: multiple login allowed, now using also $TTYBASENAME";
fi
#
# Search for our own Shell to get the PID for checking against LCK-File
#

SH2PID=`ps -ft$TTYNUMBER |
sed -n -e "s/^ *$USER *\([0-9][0-9]*\) .*-.*sh *$/\1/p`

#
# Is it the the same PID as in the LCK File so that we can start working ??
DEBUG=0
if [ $DEBUG -eq 1 ];
then
echo TTYDEV: $TTYDEV
echo TTYBASENAME: $TTYBASENAME
echo USER: $USER
echo SHPID: $SHPID
echo SH2PID: $SH2PID
fi
if [ "$SHPID" -eq "$SH2PID" ];
then
# remove the LCK-File because slattach does not like it.
rm -rf /etc/locks/LCK..$TTYBASENAME
# Add RTS/CTS Handshakeing to our own tty: Better do it in /etc/rc,
# using the program from the comp.unix.aix FAQ.
# stty add rts
SLIPLINE=`echo $TTYBASENAME | awk '//{print substr($1,4);}'`
IPADDRESS=`lsattr -E -l sl$SLIPLINE -a dest 2>/dev/null | awk '//{print $2;}'`
if [ -z "$IPADDRESS" ]
then
/usr/bin/logger -t SLIP -p error "$USER: attempt to use tty with no slip interface defined ($TTYBASENAME)"
echo "This tty ($TTYBASENAME) has not been enabled for SLIP. Please try another one or contact the system administrator."
exit 64
fi
echo SLIP starting. Your IP address is $IPADDRESS
/usr/sbin/slattach $TTYBASENAME
# Get the pid of slattach so that we can kill him later on.
SLPID=`ps -aef |
sed -n -e "s/^ *$USER *\([0-9][0-9]*\) .*-.*\/usr\/sbin\/slattach $TTYBASENAME *$/\1/p`
# Just say that we are up.
logger -t SLIP -p info "$USER: Starting up daemon (pid $SLPID) for [$IPADDRESS] on $TTYDEV"
else
# Something must be wrong with the LCK-File
SH3PID=`ps -aef | awk ' {print $2}' | grep $SHPID`

if [ ."$SH3PID" = ."" ]
then
SH3PID="NO_SUCH_PROCESS"
fi

if [ $SHPID = $SH3PID ]
then
# There is a living process which owns the LCK-File !!
/usr/bin/logger -t SLIP -p error "$USER: Cannot remove LCK file for $TTYDEV (not owner)"
exit 64
else
# Who the hell didn't remove the LCK-File (should never happen)
/usr/bin/logger -t SLIP -p error "$USER: LCK file for $TTYDEV found with no owner"
#echo `date` " LCK-File with no owner found !!!" >>$SLIPLOG
exit 64
fi
fi

if [ $DEBUG -eq 1]
then
/usr/bin/logger -t SLIP -p debug "$USER: going to trap signals..."
fi
Nov 28 11:18:46 sauternes rexecd[21420]: connect from brachetto.inferentia.it

# terminated )
trap "kill $SLPID; /usr/bin/logger -t SLIP -p info \"$USER: Killing daemon (pid $SLPID) for $TTYDEV\"; exit 0" 1

if [ $DEBUG -eq 1]
then
trap "/usr/bin/logger -t SLIP -p debug \"$USER: trap ERR\"" ERR
trap "/usr/bin/logger -t SLIP -p debug \"$USER: trap 0\"" 0
trap > /tmp/trap.$TTYBASENAME.log
/usr/bin/logger -t SLIP -p debug "$USER: trap returns $?..."
fi

# We will have a nice sleep and nice dreamings
if [ $DEBUG -eq 1]
then
/usr/bin/logger -t SLIP -p debug "$USER: going to sleep-loop..."
fi

while [ true ];
do
sleep 60;
done

# Sanity check (should never happen...)
/usr/bin/logger -t SLIP -p error "$USER: ERROR: .profile broken"



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