#!/bin/sh
#
# idea & code by Deniss (deniss@fuckoff.com ) C2003
#

FILEWITHPASS=/home/pass/webpassfile
HTTPAUTHFILE=/var/www/htdocs/auth/.htpasswd
USER=secuser
LENGTH=5
HTPASSWD=/usr/bin/htpasswd
GREP=/usr/bin/grep
CUT=/usr/bin/cut
TOUCH=/usr/bin/touch
CHOWN=/usr/bin/chown
CHMOD=/usr/bin/chmod

function genpass() {

        MATRIX="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
        while [ "${n:=1}" -le "$LENGTH" ]
        do
                PASS="$PASS${MATRIX:$(($RANDOM%${#MATRIX})):1}"
                let n+=1
        done
        echo ${PASS}
        return

}

if [ -s ${FILEWITHPASS} ]; then {
        CURRENT=`tail --lines=1 ${FILEWITHPASS}` || echo "Cant find pass file ${FILEWITHPASS}"
        CURRENT=`echo ${CURRENT} | ${GREP} -o -E '[a-zA-Z0-9]+' | ${CUT} -c 0-${LENGTH}`
}; else {
        CURRENT=`genpass`
        ${TOUCH} ${FILEWITHPASS}
        ${CHOWN} pass ${FILEWITHPASS}
        ${CHMOD} 0640 ${FILEWITHPASS}
};
fi

NEXT=`genpass`

echo ${CURRENT} > ${FILEWITHPASS}
echo ${NEXT} >> ${FILEWITHPASS}
cat ${FILEWITHPASS}
${HTPASSWD} -b ${HTTPAUTHFILE} ${USER} ${CURRENT} >/dev/null