#!/bin/bash

# Copyright © 2010 Hannes von Haugwitz <hannes@vonhaugwitz.com>

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

set -e

set -u

attributes=( "filename" "linkname" "perm" "uid" "gid" "size" "atime" \

    "ctime" "mtime" "inode" "bcount" "lnkcount" "md5" "sha1" \

    "rmd160" "tiger" "crc32" "haval" "gost" "crc32b" "attr" \

    "acl" "bsize" "rdev" "dev" "checkmask" "growingsize" "checkinode" \

    "allownewfile" "allowrmfile" "sha256" "sha512"  "selinux" \

    "xattrs" "whirlpool" "ftype" "e2fsattrs" )

NAME="aide-attributes"

err() {

    echo "$NAME: $1!" >&2

    echo "usage: $NAME HEX_NUMBER [HEX_NUMBER]"

    exit $2

}

dec2hex() {

    let hex=0x$1 2> /dev/null || err "argument '$1' is no valid hex number" 2

    if [ "$hex" -lt "0" ] || [ "$hex" -gt "$((2**${#attributes[@]}))" ] ; then

        err "argument '$1' too large (> 2^${#attributes[@]})" 3

    fi

    echo "$hex"

}

COMPARE=false

if [ -n "${1:-}" ] ; then

    a=$(dec2hex $1)

    if [ -n "${2:-}" ] ; then

        COMPARE=true

        b=$(dec2hex $2)

        [ -n "${3:-}" ] && err "Too much arguments provided" 4

    fi

else

    err "Not enough arguments provided" 1;

fi

for (( i=0; i<${#attributes[@]}; i++ )) ; do

    if $COMPARE ; then

        if (( 2**$i & $a )) && ! (( 2**$i & $b )) ; then

            echo "-"${attributes[$i]}

        elif ! (( 2**$i & $a )) && (( 2**$i & $b )) ; then

            echo "+"${attributes[$i]}

        fi

    else

        if (( 2**$i & $a )) ; then

            echo "${attributes[$i]}"

        fi

    fi

done

exit 0