NTP Server

echo "restrict 127.0.0.1" > ntp.conf.tmp
echo "restrict default kod nomodify notrap" >> ntp.conf.tmp
echo -n > step-tickers.tmp
if [ "$1" == "" ]
then
        echo "No file specified, please manually enter the NTP servers."
        echo  "You may enter as many servers as you like."
        echo  "Please enter the first server."
        read -e SERVER
        echo "server $SERVER" >> ntp.conf.tmp
        echo "$SERVER" >> step-tickers.tmp
        until [ -z "$SERVER" ]
        do
                echo "Please enter the next server, just press 'Enter' when done."
                read -e SERVER
                if [ ! -z "$SERVER" ]
                then
                        echo "server $SERVER" >> ntp.conf.tmp
                        echo "$SERVER" >> step-tickers.tmp
                fi
        done
else
        FILE="$1"
        if [ ! -f $FILE ]
        then
                echo "*** $FILE does not exist ***"
                exit 9
        elif [ ! -r $FILE ]
        then
                echo "*** unable to read $FILE ***"
                exit 10
        fi
        exec 7<&0
        exec<$FILE
        while read LINE
        do
                SERVER=$LINE
                echo "server $SERVER" >> ntp.conf.tmp
                echo "$SERVER" >> step-tickers.tmp
        done
        exec 0<&7
fi
 
echo "driftfile /var/lib/ntp/drift" >> ntp.conf.tmp
echo "The following server(s) will be used for NTP..."
cat step-tickers.tmp
if [ "$2" == "q" ] 
then
        CONFIRM="y"
else
        echo "Is this correct and do you want to continue setting up NTP ('y' or 'n') ? "
        read -e CONFIRM
fi
until [ "$CONFIRM" == "y" ] || [ "$CONFIRM" == "n" ] || [ "$CONFIRM" == "Y" ] || [ "$CONFIRM" == "N" ]
do
        echo "Please enter either 'y' or 'n': "
        read -e $CONFIRM
done
if [ "$CONFIRM" == "y" ] || [ "$CONFIRM" == "Y" ]
then
        echo "Backing up current config files..."
        cp /etc/ntp.conf /etc/ntp.conf.bk
        if [ "$?" -ne "0" ] 
        then
                echo "*** Unable to backup /etc/ntp.conf ***"
                exit 1
        fi
        cp /etc/ntp/step-tickers /etc/ntp/step-tickers.bk
        if [ "$?" -ne "0" ]
        then 
                echo "*** Unable to backup /etc/ntp/step-tickers ***"
                exit 2
        fi
        echo "Creating new config files..."
        mv -f ntp.conf.tmp /etc/ntp.conf
        if [ "$?" -ne "0" ]
        then
                echo "*** Unable to create /etc/ntp.conf ***"
                exit 3
        fi
        mv -f step-tickers.tmp /etc/ntp/step-tickers
        if [ "$?" -ne "0" ]
        then
                echo "*** Unable to create /etc/ntp/step-tickers ***"
                exit 4
        fi
        echo "Restarting NTP service..."
        service ntpd restart
        if [ "$?" -ne "0" ]
        then
                echo "*** Unable to restart NTP service ***"
                exit 5
        fi
        echo "Setting NTP to autostart..."
        chkconfig --level 345 ntpd on
        if [ "$?" -ne "0" ]
        then
                echo "*** Unable to setup NTP to autostart ***"
                exit 6
        fi
        echo "Syncing hardware clock to NTP time..."
        hwclock --systohc
        if [ "$?" -ne "0" ] 
        then
                echo "*** Unable to set hardware clock to NTP time..."
                exit 7
        fi
        echo "NTP is now setup."
        echo "If you would like to monitor the daemon run 'watch \"ntpq -p\"'."
else
        echo "User cancelled."
        exit 
fi

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