#!/bin/bash
# Script:	crackrar
# Description:	Tries to crack a password protected rar-file
#		by using a password-list.
# Author:	Bodo Akdeniz
#		http://cypher.xail.net/
#		cypher_ab@gmx.de
#		JID: cypher@amessage.de
#		ICQ#: 229442050

# Globale Variablen
SCRIPTNAME=$(basename $0 .sh)
VERSION="0.1"

EXIT_SUCCESS=0
EXIT_FAILURE=1
EXIT_ERROR=2
EXIT_BUG=10


# Variablen für Optionsschalter hier mit Default-Werten vorbelegen
VERBOSE=n
INPUTFILE="/dev/stdin"
OVERWRITEFILES="or"
LOGFILE="rar.log"

# Funktionen
function usage {
        echo "Usage: $SCRIPTNAME [-h] [-v] [-o] [-l LOGFILE] [-f INPUTFILE] RARFILE..." >&2
	echo "Try to extract RARFILE using the lines of INPUTFILE or STDIN as passwords." >&2
	echo ""
	echo "Options:"
	echo "  -h		Show this help"
	echo "  -v		Switch to verbose mode"
	echo "  -o		Overwrite existing files"
	echo "  -l LOGFILE	Specify a logfile for the output of rar (default: rar.log)"
	echo "  -f INPUTFILE	Read passwords from INPUTFILE, not from STDIN"
	echo ""
	echo "You need rar from http://www.rarlab.com/download.htm to use this script!"
	echo ""
	echo "Author: Bodo Akdeniz // http://cypher.xail.net/ // cypher_ab@gmx.de"
	echo "Version: $VERSION"
        [[ $# -eq 1 ]] && exit $1 || exit $EXIT_FAILURE
}

function printIfVerbose {
	if [[ $VERBOSE = y ]]; then
		echo $1;
	fi
}

function printOut {
	echo $1;
}

# Die Option -h für Hilfe sollte immer vorhanden sein, die Optionen
# -v und -o sind als Beispiele gedacht. -o hat ein Optionsargument;
# man beachte das auf "o" folgende ":".
while getopts ':f:l:vho' OPTION ; do
        case $OPTION in
        v)        VERBOSE=y
                ;;
        f)        INPUTFILE="$OPTARG"
                ;;
        h)        usage $EXIT_SUCCESS
                ;;
	l)	  LOGFILE="$OPTARG"
		;;
	o)	  OVERWRITEFILES="o+"
		;;
        \?)        echo "Unknown option \"-$OPTARG\"." >&2
                usage $EXIT_ERROR
                ;;
        :)        echo "Option \"-$OPTARG\" needs an argument." >&2
                usage $EXIT_ERROR
                ;;
        *)        echo "You should not see this ;-)"
>&2
                usage $EXIT_BUG
                ;;
        esac
done
# Verbrauchte Argumente überspringen
shift $(( OPTIND - 1 ))

# Eventuelle Tests auf min./max. Anzahl Argumente hier
if (( $# < 1 )) ; then
        echo "Give at least one argument." >&2
        usage $EXIT_ERROR
fi

# Schleife über alle Argumente
for ARG ; do
	printIfVerbose "Argument: $ARG"
done

printIfVerbose "Output of rar is written in $LOGFILE"

if [[ $INPUTFILE = "/dev/stdin" ]]; then
	printIfVerbose "Reading input from STDIN."
else
	printIfVerbose "Reading input from $INPUTFILE."
fi

PASSWORDS=""
while read line
do
	PASSWORDS="$PASSWORDS $line"
done < $(echo $INPUTFILE)

printIfVerbose "Passwords: $PASSWORDS"

SUCCESS="n"
FAILURECOUNT=0
for ARG; do
	printOut "Working on $ARG..."
	SUCCESS="n"
	for PASSWORD in $PASSWORDS; do
		printIfVerbose "Trying \"$PASSWORD\"..."
		if rar x -p$PASSWORD -$OVERWRITEFILES $ARG &> $LOGFILE; then
			printIfVerbose "$ARG was extracted with \"$PASSWORD\" as password."
			SUCCESS="y"
			break
		else
			printIfVerbose "Failed"
		fi
	done

	if [[ $SUCCESS = "y" ]]; then
		printOut "$ARG was extracted successfully."
	else
		printOut "Failed."
		let "FAILURECOUNT++"
	fi
done

if [[ $FAILURECOUNT -eq 0 ]]; then
	printIfVerbose "Everything's wright :-)"
	exit $EXIT_SUCCESS
else
	printOut "$FAILURECOUNT archive(s) could not be extracted."
	exit $EXIT_FAILURE
fi