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#! /bin/sh
# this program collects some entropy from the system
# into the file "my_random_file" and outputs the 16-bit
# Unix 'sum' checksum (seems to be the only portable way
# to get true entropy with a shell script).
# Apparently, on FreeBSD /dev/random does not block (???), must make sure
# we really got something rather than nothing.
rnd_tst=no
/bin/rm -f ./my_random_file 2>/dev/null
if test -r "/dev/urandom"; then
if test -c "/dev/urandom"; then
dd if=/dev/urandom ibs=1 count=4 > my_random_file 2>/dev/null
nsum=`cksum ./my_random_file | awk '{print $1 }' | sed 's%^0*%%g' 2>/dev/null`
if test x$nsum != x; then
rnd_tst=yes
fi
fi
fi
if test x$rnd_tst = xno; then
if test -r "/dev/srandom"; then
if test -c "/dev/srandom"; then
dd if=/dev/srandom ibs=1 count=4 > my_random_file 2>/dev/null
nsum=`cksum ./my_random_file | awk '{print $1 }' | sed 's%^0*%%g' 2>/dev/null`
if test x$nsum != x; then
rnd_tst=yes
fi
fi
fi
fi
if test x$rnd_tst = xno; then
#
touch ./my_random_file
#
if test -r "/usr/ucb/vmstat"; then
/usr/ucb/vmstat >> my_random_file 2>/dev/null
fi
if test -r "/bin/vmstat"; then
/bin/vmstat >> my_random_file 2>/dev/null
fi
if test -r "/sbin/vmstat"; then
/sbin/vmstat >> my_random_file 2>/dev/null
fi
if test -r "/usr/bin/vmstat"; then
/usr/bin/vmstat >> my_random_file 2>/dev/null
fi
if test -r "/usr/sbin/vmstat"; then
/usr/sbin/vmstat >> my_random_file 2>/dev/null
fi
if test -r "/usr/local/bin/vmstat"; then
/usr/local/bin/vmstat >> my_random_file 2>/dev/null
fi
#
if test -r "/usr/ucb/netstat"; then
/usr/ucb/netstat -n >> my_random_file 2>/dev/null
fi
if test -r "/bin/netstat"; then
/bin/netstat -n >> my_random_file 2>/dev/null
fi
if test -r "/sbin/netstat"; then
/sbin/netstat -n >> my_random_file 2>/dev/null
fi
if test -r "/usr/bin/netstat"; then
/usr/bin/netstat -n >> my_random_file 2>/dev/null
fi
if test -r "/usr/sbin/netstat"; then
/usr/sbin/netstat -n >> my_random_file 2>/dev/null
fi
if test -r "/usr/local/bin/netstat"; then
/usr/local/bin/netstat -n >> my_random_file 2>/dev/null
fi
#
#
if test -r "/usr/ucb/ps"; then
/usr/ucb/ps -ef >> my_random_file 2>/dev/null
fi
if test -r "/bin/ps"; then
/bin/ps -ef >> my_random_file 2>/dev/null
fi
if test -r "/sbin/ps"; then
/sbin/ps -ef >> my_random_file 2>/dev/null
fi
if test -r "/usr/bin/ps"; then
/usr/bin/ps -ef >> my_random_file 2>/dev/null
fi
if test -r "/usr/sbin/ps"; then
/usr/sbin/ps -ef >> my_random_file 2>/dev/null
fi
if test -r "/usr/local/bin/ps"; then
/usr/local/bin/ps -ef >> my_random_file 2>/dev/null
fi
#
#
if test -r "/usr/ucb/arp"; then
/usr/ucb/arp -a >> my_random_file 2>/dev/null
fi
if test -r "/bin/arp"; then
/bin/arp -a >> my_random_file 2>/dev/null
fi
if test -r "/sbin/arp"; then
/sbin/arp -a >> my_random_file 2>/dev/null
fi
if test -r "/usr/bin/arp"; then
/usr/bin/arp -a >> my_random_file 2>/dev/null
fi
if test -r "/usr/sbin/arp"; then
/usr/sbin/arp -a >> my_random_file 2>/dev/null
fi
if test -r "/usr/local/bin/arp"; then
/usr/local/bin/arp -a >> my_random_file 2>/dev/null
fi
#
#
if test -r "/usr/ucb/w"; then
/usr/ucb/w >> my_random_file 2>/dev/null
fi
if test -r "/bin/w"; then
/bin/w >> my_random_file 2>/dev/null
fi
if test -r "/sbin/w"; then
/sbin/w >> my_random_file 2>/dev/null
fi
if test -r "/usr/bin/w"; then
/usr/bin/w >> my_random_file 2>/dev/null
fi
if test -r "/usr/sbin/w"; then
/usr/sbin/w >> my_random_file 2>/dev/null
fi
if test -r "/usr/local/bin/w"; then
/usr/local/bin/w >> my_random_file 2>/dev/null
fi
#
# Don't use (NFS problems ahead)
#
# if test -r "/usr/ucb/df"; then
# /usr/ucb/df >> my_random_file 2>/dev/null
# fi
# if test -r "/bin/df"; then
# /bin/df >> my_random_file 2>/dev/null
# fi
# if test -r "/sbin/df"; then
# /sbin/df >> my_random_file 2>/dev/null
# fi
# if test -r "/usr/bin/df"; then
# /usr/bin/df >> my_random_file 2>/dev/null
# fi
# if test -r "/usr/sbin/df"; then
# /usr/sbin/df >> my_random_file 2>/dev/null
# fi
# if test -r "/usr/local/bin/df"; then
# /usr/local/bin/df >> my_random_file 2>/dev/null
# fi
#
#
if test -r "/usr/ucb/free"; then
/usr/ucb/free >> my_random_file 2>/dev/null
fi
if test -r "/bin/free"; then
/bin/free >> my_random_file 2>/dev/null
fi
if test -r "/sbin/free"; then
/sbin/free >> my_random_file 2>/dev/null
fi
if test -r "/usr/bin/free"; then
/usr/bin/free >> my_random_file 2>/dev/null
fi
if test -r "/usr/sbin/free"; then
/usr/sbin/free >> my_random_file 2>/dev/null
fi
if test -r "/usr/local/bin/free"; then
/usr/local/bin/free >> my_random_file 2>/dev/null
fi
#
#
if test -r "/usr/ucb/uptime"; then
/usr/ucb/uptime >> my_random_file 2>/dev/null
fi
if test -r "/bin/uptime"; then
/bin/uptime >> my_random_file 2>/dev/null
fi
if test -r "/sbin/uptime"; then
/sbin/uptime >> my_random_file 2>/dev/null
fi
if test -r "/usr/bin/uptime"; then
/usr/bin/uptime >> my_random_file 2>/dev/null
fi
if test -r "/usr/sbin/uptime"; then
/usr/sbin/uptime >> my_random_file 2>/dev/null
fi
if test -r "/usr/local/bin/uptime"; then
/usr/local/bin/uptime >> my_random_file 2>/dev/null
fi
#
#
if test -r "/usr/ucb/procinfo"; then
/usr/ucb/procinfo -a >> my_random_file 2>/dev/null
fi
if test -r "/bin/procinfo"; then
/bin/procinfo -a >> my_random_file 2>/dev/null
fi
if test -r "/sbin/procinfo"; then
/sbin/procinfo -a >> my_random_file 2>/dev/null
fi
if test -r "/usr/bin/procinfo"; then
/usr/bin/procinfo -a >> my_random_file 2>/dev/null
fi
if test -r "/usr/sbin/procinfo"; then
/usr/sbin/procinfo -a >> my_random_file 2>/dev/null
fi
if test -r "/usr/local/bin/procinfo"; then
/usr/local/bin/procinfo -a >> my_random_file 2>/dev/null
fi
#
nsum=`cksum ./my_random_file | awk '{print $1 }' | sed 's%^0*%%g' 2>/dev/null`
#
fi
#
# 'cksum' is more portable than 'sum', but 32 bit
#
/bin/rm -f ./my_random_file 2>/dev/null
final=`expr $nsum \% 65536`
echo $final
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