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#!/bin/sh
# This script will monitor dhcpd.leases and parse
# out active leases and ensure they are present
# in /var/etc/hosts
update_hosts_file() {
# $1 = host
# $2 = ip
cat /var/etc/hosts | grep -v "$1" > /tmp/hosts.tmp
if [ "$3" != "" ]; then
echo "$2 $1 # dynamic entry created by rc.parse-isc-dhcpd" >> /tmp/hosts.tmp
fi
mv /tmp/hosts.tmp /var/etc/hosts
killall -HUP dnsmasq
}
# Parse file on initial run
cat /var/dhcpd/var/db/dhcpd.leases | grep "lease" -A8 | while read LINE
do
HOSTNAMEA=`echo "$LINE" | grep client-hostname | awk '{ print $2 }' | cut -d'"' -f2`
ACTIVEA=`echo "$LINE" | grep active`
IPADDRA=`echo "$LINE" | grep lease | awk '{ print $2 }'`
if [ "$HOSTNAMEA" != "" ]; then
HOSTNAME="$HOSTNAMEA"
fi
if [ "$ACTIVEA" != "" ]; then
ACTIVE="$ACTIVEA"
fi
if [ "$IPADDRA" != "" ]; then
IPADDR="$IPADDRA"
fi
if [ "$HOSTNAME" != "" ]; then
if [ "$IPADDR" != "" ]; then
update_hosts_file "$HOSTNAME" "$IPADDR" "$ACTIVE"
HOSTNAME=""
ACTIVE=""
IPADDR=""
fi
fi
done
# After processed go ahead and tail file looking for changes.
tail -F /var/dhcpd/var/db/dhcpd.leases | grep "lease" -A8 | while read LINE
do
HOSTNAMEA=`echo "$LINE" | grep client-hostname | awk '{ print $2 }' | cut -d'"' -f2`
ACTIVEA=`echo "$LINE" | grep active`
IPADDRA=`echo "$LINE" | grep lease | awk '{ print $2 }'`
if [ "$HOSTNAMEA" != "" ]; then
HOSTNAME="$HOSTNAMEA"
fi
if [ "$ACTIVEA" != "" ]; then
ACTIVE="$ACTIVEA"
fi
if [ "$IPADDRA" != "" ]; then
IPADDR="$IPADDRA"
fi
if [ "$HOSTNAME" != "" ]; then
if [ "$IPADDR" != "" ]; then
update_hosts_file "$HOSTNAME" "$IPADDR" "$ACTIVE"
HOSTNAME=""
ACTIVE=""
IPADDR=""
fi
fi
done
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