#!/bin/sh

ROOT_UID=0      # Only users with $UID 0 have root privileges.
E_NOTROOT=67    # Non-root exit error.

# Run as root, of course.
if [ "$UID" -ne "$ROOT_UID" ]; then
  echo "Must be root to run this script."
  exit $E_NOTROOT
fi

nslookup=`nslookup \`uname -n\` | grep Address: | tail -1 | awk '{print $2}'`
#echo nslookup=$nslookup

checkip=`curl http://checkip.dyndns.org  | awk '{print $6}' `
#echo checkip=$checkip

checkipLen=`echo ${#checkip}`
#echo checkipLen=$checkipLen

checkip=`echo ${checkip:0:($checkipLen -15)}`
#echo new checkip=$checkip

if [ "$nslookup" != "$checkip" ]; then
  runcurl="curl http://username:password@members.dyndns.org/nic/update?system=dyndns&hostname=site1.dyndns.org,site2.dyndns.org&myip=$checkip&wildcard=ON"
  #echo runcurl=$runcurl
  `echo $runcurl`
  echo -e "Running runlikeddclient on `hostname -s`" | (cat <<EOF
This is an automated report of $0 on the server `hostname -s`.

EOF
cat
) | /bin/mail -s "runlikeddclient" root
fi

exit 0