Fix #22

#!/bin/bash

if [ -z "$2" ] || [ "$1" != 'Name' ] && [ "$1" != 'MAC' ]

then

    echo "Usage:"

    echo "\t $0 MAC aa:bb:cc:dd:ee:ff"

    echo "Or"

    echo "\t $0 Name hostname"

    exit 1

fi

lease_file="/var/lib/dhcp/dhcpd.leases"

cp $lease_file $lease_file.$(date "+%Y%m%d-%H%M%S")

if [ "$1" == 'MAC' ]

then

    MAC=$2

    awk -v MAC="$MAC" 'BEGIN{IN=0;ACCU=""} /^lease/{print ACCU;ACCU="";IN=1;do_print=1} /hardware ethernet/{if($3==MAC";"){do_print=0}} {ACCU=ACCU"\n"$0} /^}$/{if(do_print==1){print ACCU};IN=0;do_print=0;ACCU=""}' $lease_file > /tmp/$$

else

    HOST="\"$2\""

    awk -v HOST="$HOST" 'BEGIN{IN=0;ACCU=""} /^lease/{print ACCU;ACCU="";IN=1;do_print=1} /client-hostname/{if($2==HOST";"){do_print=0}} {ACCU=ACCU"\n"$0} /^}$/{if(do_print==1){print ACCU};IN=0;do_print=0;ACCU=""}' $lease_file > /tmp/$$

fi

sed '/^$/d' /tmp/$$ > $lease_file

systemctl restart isc-dhcp-server

    log "===== Begin host $name ($mac - $ip) ===="

    cat $f >> $mainlog

    log "===== End host $name ===="

    if [ $(wc -l $f | awk '{print $1}') -gt 0 ]

    if [ $(wc -l $f | awk '{print $1}') -lt 0 ]

    then

        DOWNS[$mac]=$name

    fi