#!/bin/bash
# File:  /root/ntpdate_client
# Autor: Pierre Burri, 17 July 2003
# checks first if a known local ntp server exists, otherwise check for a
# router and tries to query some known internet ntp servers.
# ------------------------------------------------------------------------
# local_ntp_server="192.168.10.15"
# local_ntp_server="192.168.71.241"
#local_ntp_server="192.168.100.133"
ntp_server1="ntp3.fau.de"
ntp_server2="ntps1-1.cs.tu-berlin.de"
router=$(/sbin/route -n |/bin/sed -n 's/^0.0.0.0 *\([1-2][0-9]*\.[0-9]\+\.[0-9]\+\.[0-9]\+\).*/\1/p')
#
if [ $TERM = xterm -o $TERM = linux ]
then 
  show_msg=$(tty)
else
  show_msg="/dev/null"
fi
#
function query_internet_ntpservers () {
  if [ $router  ]
  then
     /bin/ping -w 2 -c 1 $router &> /dev/null
     if [ $? -eq 0 ]
     then
       /usr/sbin/ntpdate -v $ntp_server1 &> $show_msg
       if [ $? -ne 0 ]
       then
           /usr/sbin/ntpdate -v $ntp_server2 &> $show_msg
       fi
     else
       echo no connection to a router > $show_msg
     fi
  else
    echo no default route found > $show_msg
  fi
}
#
/bin/ping -w 2 -c 1 $local_ntp_server &> /dev/null
if [ $? -eq 0 ]
then  
  /usr/sbin/ntpdate -v $local_ntp_server &> $show_msg
  if [ $? -ne 0 ]
  then
    query_internet_ntpservers
  fi
else
   echo no local ntp server found, tries now two internet ntp servers  > $show_msg
   query_internet_ntpservers
fi
#-------------- Now set the Hardware clock to the system time and date -----------------
/sbin/hwclock --systohc
exit 0