devastator

#! /bin/sh

iter=1
zeroing=false

while getopts ":0hc:d:" opt; do
	case ${opt} in

		c)	
			temp=${OPTARG}
			case $temp in
				''|*[!0-9]*) 
						echo "Invalid Count"
						exit 1
				;;

				0)
						echo "Zero times? Really?"
                                                exit 1
				;;

				*)		
						iter=$temp	
				;;
			esac
		;;

		d)	
			if [ -c $OPTARG ] 
				then 
					device=$OPTARG
					size=`diskinfo $device | awk '{print $3}'`
				else
					echo "Not a valid device"
					exit 1
			fi
		;;

                0)
                        zeroing=true
                ;;

		h)	
			echo "devastator"
			echo "A quick and dirty 'secure' device scrubber"
			echo "Usage: $0 [optional flags] -d <device node>"
			echo "Flags:"
			echo "-0 enable aditional zeroing pass"
			echo "-c <count> for multiple iterations"
			echo "-h what you're reading"
			exit
			;;
		*) 
			echo "Invalid option" 
			exit 1
			;;
	esac
done

if [ -z $device ] 
	then
	echo "Missing device node"
	exit 1
fi

count=0

while [ $count -lt $iter ]
	do
	count=`expr $count + 1`
	echo "Pass $count of $iter"
	openssl enc -bf -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | b64encode -r -)" -nosalt </dev/zero | pv -bartpes $size | dd bs=64k of=$device >/dev/null 2>&1
	echo "^ thanks OpenSSL for not implementing SIGPIPE correctly"
done

if [ "$zeroing" = true ]
	then
	echo "Zero Pass"
	dd if=/dev/zero bs=1024k | pv -bartpes $size | dd bs=1024k of=$device >/dev/null 2>&1 
fi