#!/bin/bash
# simple linux rar cracker (slrc) v0.2 by Stefan Behte (http://ge.mine.nu)
#
# I wrote this to practise/test bash getopts and also because I didn't find any
# rar cracker for linux when I wanted to check a file against a wordlist.
# I know doing it this way is slow but I wanted a quick hack ;)
#
# Copyright (c) 2006 by Stefan Behte
#
# slrc 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.
#
# slrc 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 slrc; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
# Written by Stefan Behte
#
# Please send bugs, comments, wishes and success stories to:
# Stefan.Behte at gmx dot net 
#
# Also have a look at my page:
# http://ge.mine.nu/
#

echo -e "\nsimple linux rar cracker (slrc) v0.2 by Stefan Behte (http://ge.mine.nu)"

usage()
{
        printf "\n$0 [-b /path/to/unrar] [-B /path/to/john] [-f rarfile] [-w wordlist] [-i maxlen:chartype] [-r]\n"
  printf "       \"chartype\" may be alpha, digits, alnum or all\n"
  printf "\nexamples:\n"
  printf "$0 -f /tmp/test.rar -w ./passwords.txt\n"
  printf "$0 -b /opt/rar/bin/unrar -B /usr/sbin/john -f /tmp/test.rar -i 4:digits\n\n"
  exit 1
}

die()
{
        printf "$@\n"
        exit 1
}

if [ ! -n "`which unrar`" ]
then
  die "\nunrar not found.\n"
fi

fcnt=0;
RAR=unrar
RARPARAMS="t -p"
JOHN=john

while getopts ":f:w:l:i:b:B:r" Option
do
  case $Option in
    f) if [ -e ${OPTARG} ]; then FILE=${OPTARG};else die "$OPTARG does not exist.\n";fi;;
    w) if [ -e ${OPTARG} ]; then total=`wc -l ${OPTARG} | awk '{print $1}'`;cmd="cat ${OPTARG}";else die "$OPTARG does not exist.\n";fi;;
    l) fcnt=${OPTARG};;
    i) john=y;cmd="$JOHN -stdout:`echo ${OPTARG} | awk -F: '{print $1}'` -i:`echo ${OPTARG} | awk -F: '{print $2}'`";;
    b) RAR=${OPTARG};;
    B) JOHN=${OPTARG};;
    r) john=y;cmd="john -restore";;
    *) usage;;
  esac
done

if [ "$cmd" = "" ]
then
  usage
fi

cnt=0
starttime=`date +'%s'`
RETVAL=0
echo

$cmd | while read pwd
do

  cnt=$[$cnt + 1]

  if [ $fcnt -le $cnt ]
  then
    if [ "${pwd}" != "" ]
    then
      $RAR $RARPARAMS"${pwd}" $FILE &>/dev/null
      RETVAL=$?
    fi

    diff=$[ `date +'%s'` - $starttime ]

    if [ $diff -eq 0 ]
    then
      diff=1
    fi
    persec=$[${cnt} / ${diff}]

    if [ $persec -eq 0 ]
    then
      persec=1
    fi

    if [ "$john" != "y" ]
    then
      todo=$[$total - $cnt]
      echo "[$cnt/$todo/$total] [${persec}/s] [$diff/$[ ${todo} / ${persec} ]s]: ${pwd}"
    else
      # (todo &) total ausrechnen -> alpha=26 * stellen
      echo "[$cnt] [${persec}/s]: ${pwd}"
    fi

    if [ $RETVAL -eq 0 ]
    then
      $RAR $RARPARAMS"${pwd}" $FILE &>/dev/null
      if [ $? -eq 0 ]
      then
        echo -e "\nPassword found: ${pwd}"
      fi
      exit
    fi
  fi

done
echo

if [ ! $RETVAL -eq 0 ]
then
  echo -e "Sorry, password not found.\n"
fi