linux howto - fabio de lorenzo personal informations and experiences

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#!/bin/sh
#
# ip-up: shell script hook called by pppd when the interface is brought up
#
# Parameters are:
# $0: name of the script (ip-up or ip-down)
# $1: name of the network device (such as ppp0)
# $2: name of the tty device (such as /dev/ttyS0)
# $3: speed of the tty device in Bits Per Second (such as 115200)
# $4: the local IP address in dotted decimal notation
# $5: the remote IP address in dotted decimal notation
#
# /tmp/local_name is a file with my local machine name
# /etc/hosts.local is the default /etc/hosts file with
# 127.0.0.1 localhost as the only entry
#
# This script handles:
# 1) getting the correct /etc/resolv.conf (either ibm or together.net)
# 2) making it possible to ping my own address
# 3) updating my /etc/hosts file to have the address and name
#
#echo "ip-up parameters are: $*" >/dev/console
LOGGER="/usr/bin/logger -t pppd"

$LOGGER "ip-up parameters are: $*"

# 0) determine connect speed
CSpeed=`/usr/bin/grep ARQ /etc/ppp/ppp.log | /usr/bin/tail -1 | \
/usr/bin/sed -e 's/.*: *//' -e 's|/.*||'`
#echo "Connected at $CSpeed" >/dev/console

# 1) make it possible to ping my own address
/sbin/route add -host $4 lo

#
# 2) Determine whether this is my internal network or not
#
# Determine the network connected to
NETWORK=`/usr/local/bin/netmath -a $4 255.0.0.0`
if [ x$NETWORK != "x192.0.0.0" ]; then

# 3) Set up /etc/resolv.conf and named.boot files based on
# the network connected to.
#
if [ x$NETWORK = "x9.0.0.0" ]; then
/bin/cp -p /etc/resolv.ibm /etc/resolv.conf
/bin/cp -p /etc/named.ibm /etc/named.boot
else
if [ x$NETWORK = "x204.0.0.0" ]; then
/bin/cp -p /etc/resolv.together.net /etc/resolv.conf
/bin/cp -p /etc/named.together.net /etc/named.boot
else
if [ x$NETWORK = "x207.0.0.0" ]; then
/bin/cp -p /etc/resolv.together.net /etc/resolv.conf
/bin/cp -p /etc/named.together.net /etc/named.boot
else
if [ x$NETWORK = "x208.0.0.0" ]; then
/bin/cp -p /etc/resolv.together.net /etc/resolv.conf
/bin/cp -p /etc/named.together.net /etc/named.boot
else
echo "Bad NETWORK value '$NETWORK'" >/dev/console
fi
fi
fi
fi

# 4) Reload nameserver
# -- Debian version
#/etc/init.d/bind reload
# -- Slackware version
if [ -f /var/run/named.pid ]; then
# echo "Reloading nameserver" >/dev/console
kill `cat /var/run/named.pid`
/usr/sbin/named
# echo "Done... nameserver" >/dev/console
fi

# 5) update /etc/hosts file
#
# Put generic hosts file in place

# Determine the name of my address
/usr/bin/host $4 | fgrep Name | cut -c7- > /tmp/ip_name

# Put my address in a file
echo "$4" >/tmp/ip

# Build a new line for /etc/hosts
/usr/bin/paste /tmp/ip /tmp/ip_name /etc/hostname > /tmp/host_bottom

# Build the new /etc/hosts file
/bin/cat /tmp/host_bottom /etc/hosts.local > /etc/hosts

# Update hostname
#hostname `cat /tmp/ip_name`

# Update /etc/sendmail.cw file
cat /tmp/ip_name >>/etc/sendmail.cw

# clean up
/bin/rm -f /tmp/ip /tmp/ip_name /tmp/host_bottom

# 6) Recycle the sendmail daemon:
# -- Debian version
#/etc/init.d/sendmail stop
#/etc/init.d/sendmail start
# -- Slackware version
/bin/ps ax | /usr/bin/grep sendmail | /usr/bin/grep -v grep >/tmp/xx
while read PID x; do
if [ x$PID != "x" ]; then
kill $PID
fi
done </tmp/xx
/usr/sbin/sendmail -bd -q10m

# Now get rid of /tmp/xx
/bin/rm -f /tmp/xx

fi # end of if [ x$NETWORK != x192.0.0.0 ]

# Tell everyone it's up
#echo "PPP link on interface $1 ($4<->$5) initiated" >/dev/console
$LOGGER "PPP link on interface $1 ($4->$5) initiated @ $CSpeed"