contrib/scripts/net-resolver.sh

   1 #!/bin/sh
   2
   3 # Check for number of parameters
   4 if [ $# -ne 1 ]; then
   5         echo Usage: $(basename $0) dns-name
   6         exit 1
   7 fi
   8
   9 # Check for needed commands
  10 for cmd in /usr/bin/host /usr/bin/fping /usr/sbin/arp; do
  11         if [ ! -x $cmd ]; then
  12                 echo $cmd command not found - aborting
  13                 exit 2
  14         fi
  15         eval $(echo ${cmd##*/}=$cmd)
  16 done
  17
  18 mac=""
  19 ip=$(LANG=C $host $1 | grep address | head -n1 | sed 's/^.*[^0-9]\([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*$/\1/g')
  20 if [ -z "$ip" ]; then
  21         echo ";"
  22         exit 0
  23 fi
  24 if $fping -c1 -r3 -t500 $ip &> /dev/null; then
  25         mac=$($arp -n | awk "/^$ip/ {print \$3}")
  26 fi
  27 echo "$ip;$mac"