#!/bin/sh

# The following are the strings which preface the names of the machines
# when booted into the relevant OS
LINUX='clustor'
WINDOWSNT='winnt'

# Strings used to represent the name of the OS
OS_LINUX='Linux'
OS_WINDOWSNT='WindowsNT'

# clients which are known to be down (eg, when removed or dead).
# For eg, KNOWN_DOWN='01 05' 
KNOWN_DOWN=''

# The file used to store the previously found config
CONFFILE='/usr/local/etc/client.conf'

# Returns 0 if machine down, 1 if up
up() {
	ping -c 1 $1 | grep 100 > /dev/null
}

# Returns the string representing the machine's last known state.
last_linux() {
	if [ "x$USER" = 'xroot' ]
	then
		ret=`grep "^$1 " ${CONFFILE}.old | awk '{print $2}'`
	else
		ret=`grep "^$1 " ${CONFFILE} | awk '{print $2}'`
	fi
	if [ "x$ret" = "x$OS_LINUX" ]
	then
		return 1
	elif [ "x$ret" = "x$OS_WINDOWSNT" ]
	then
		return 0
	else
		return -1
	fi
}

print() {
	if [ "x$USER" = 'xroot' ]
	then
		echo $1 >> $CONFFILE
	fi
	echo $1
}

if [ "x$USER" = 'x' ]
then
	USER=`whoami`
fi

if [ "x$USER" = 'xroot' ]
then
	mv ${CONFFILE} ${CONFFILE}.old
	touch ${CONFFILE}
fi

for num in 01 02 03 04 05 06 07 08 09 10 11 12 13 14 51 52 53 54 55 56 57 58 59 60 61 62 64 65 66
do
  echo $KNOWN_DOWN | grep "$num" > /dev/null
  if [ $? -eq 0 ]
  then
	print "$num    Down         -"
  else

	# Initialisation
	linux=0
	winnt=0

	# Now determine what the current configuration is.
	last_linux $num
	lastlinux=$?
	if [ $lastlinux -eq 1 ]
	then
		up "$LINUX$num"
		linux=$?
	fi
	if [ $linux -eq 0 ]
	then
		up "$WINDOWSNT$num"
		winnt=$?
		if [ $winnt -eq 0 ]
		then
			up "$LINUX$num"
			linux=$?
		fi
	fi
	if [ $linux -eq 0  -a  $winnt -eq 1 ]
	then
		# Machine is booted into Windows NT
		print "$num    $OS_WINDOWSNT    $WINDOWSNT$num"
	elif [ $linux -eq 1  -a  $winnt -eq 0 ]
	then
		# Machine is booted into Linux
		print "$num    $OS_LINUX        $LINUX$num"
	elif [ $linux -eq 0  -a  $winnt -eq 0 ]
	then
		# Machine is down
		print "$num    Down         -"
	else
		# Machine is running both.
		print "$num    $OS_LINUX        $LINUX$num"
		print "$num    $OS_WINDOWSNT    $WINDOWSNT$num"
	fi
  fi
done