#!/bin/bash
#===============================================================================
#
# DIRECTORY:
#   /home/*/.local/share/nautilus/scripts/05c-Linux/
# OR
#   /home/*/.gnome2/nautilus-sctipts/05c-Linux/ (deprecated)
#
# FILE:
#   03-E01-timezone
#
# USAGE:
#   Right click on a EWF_E01 image (.E01) and
#   choose this nautilus script from the context menu.
#
# OPTIONS:
#   none
#
# DESCRIPTION:
#   Stored and shows timezone information.
#
# REQUIREMENTS:
#   bash, zenity, sleuthkit, awk, sed, openssl and grep
#
# BUGS:
#   ---
#
# NOTES:
#   Tested on
#   - Debian 8+
#   - Arch Linux
#
# AUTHOR:
#   Patrick Neumann, patrick@neumannsland.de
#
# COMPANY:
#   (privately)
#
# VERSION:
#   0.9 (beta)
#
# LINK TO THE MOST CURRENT VERSIONS:
#   https://...
#
# CREATED:
#   24.04.2020
#
# COPYRIGHT (C):
#   2015-2020 - Patrick Neumann
#
# LICENSE:
#   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 3 of the License, or
#   (at your option) any later version.
#
# WARRANTY:
#   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, see <http://www.gnu.org/licenses/>.
#
# TODO:
#   ---
#
# HISTORY:
#   0.9 - Patrick Neumann - Initial (public) release
#
#===============================================================================

#-------------------------------------------------------------------------------
# Additional supported Distribution(s) (add before Library!).
#-------------------------------------------------------------------------------
SUPPORTED_OSR="arch"

#-------------------------------------------------------------------------------
# Check for library (casualscripter_nautilus-scripts_functions.sh).
#-------------------------------------------------------------------------------
readonly LIBRARY="${0%/*/*}/.casualscripter_nautilus-scripts_functions.sh"
if [ ! -f "${LIBRARY}" ] ; then
  zenity --error \
         --text \
         "ERROR: casualscripter_nautilus-scripts_functions.sh MISSING!"
  exit 1
fi

source "${LIBRARY}"

#-------------------------------------------------------------------------------
# Checks (see library "casualscripter_nautilus-scripts_functions.sh").
#-------------------------------------------------------------------------------
check_dep "${AWK_BIN}" "awk"
check_dep "${FLS_BIN}" "sleuthkit"
check_dep "${FSSTAT_BIN}" "sleuthkit"
check_dep "${GREP_BIN}" "grep"
check_dep "${ICAT_BIN}" "sleuthkit"
check_dep "${IFIND_BIN}" "sleuthkit"
check_dep "${ISTAT_BIN}" "sleuthkit"
check_dep "${MMLS_BIN}" "sleuthkit"
check_dep "${OPENSSL_BIN}" "openssl"
check_dep "${SED_BIN}" "sed"

check_ext "${SOURCE}" "[eE]01"

check_tmp

#-------------------------------------------------------------------------------
# A little bit of configuration before the magic.
#-------------------------------------------------------------------------------
readonly OFFSET="$( choose_partition "${SOURCE}" | ${AWK_BIN} -F "_" '{ print $3; }' )"

readonly TIMEZONE="${TMP}/${OFFSET}-timezone.txt"

#-------------------------------------------------------------------------------
# A wonder maybe takes "a little bit" longer... :-/
#-------------------------------------------------------------------------------
if ${FSSTAT_BIN} -o "${OFFSET}" "${SOURCE}" > /dev/null 2>&1 ; then
  (
    echo -e -n "Partition (mmls line):\n  " >> "${TIMEZONE}"
    ${MMLS_BIN} -aM "${SOURCE}" \
    | ${AWK_BIN} '$3=='"${OFFSET}"' { print $0; }' \
    >> "${TIMEZONE}"  

    lt_inode="$( ${IFIND_BIN} -o "${OFFSET}" \
                              -n "/etc/localtime" \
                              "${SOURCE}" )"
    if [ "${lt_inode}" != "File not found" ] ; then
      symlink="$( ${ISTAT_BIN} -o "${OFFSET}" "${SOURCE}" "${lt_inode}" \
                  | ${AWK_BIN} -F ":" '/symbolic link to/ { sub( /.*\/usr\/share\/zoneinfo\//, "", $2 ); print $2 }' )"
      echo -e -n "  Information from \"/etc/localtime\":\n  " >> "${TIMEZONE}"
      if [ -n "${symlink}" ] ; then
        echo "${symlink}" >> "${TIMEZONE}"
      else
        lt_md5="$( ${ICAT_BIN} -o "${OFFSET}" \
                               "${SOURCE}" \
                               "${lt_inode}" \
                   | ${OPENSSL_BIN} dgst -md5 \
                   | ${AWK_BIN} '{ print $NF; }' )"
        zi_inode="$( ${IFIND_BIN} -o "${OFFSET}" \
                                  -n "/usr/share/zoneinfo" \
                                  "${SOURCE}" )"
        zoneinfo="$( ${FLS_BIN} -o "${OFFSET}" \
                                -m "/usr/share/zoneinfo" \
                                -h \
                                -r \
                                "${SOURCE}" \
                                "${zi_inode}" \
                     | ${GREP_BIN} --invert-match --fixed-strings "deleted" \
                     | ${AWK_BIN} --field-separator "|" \
                                  '/'"${lt_md5}"'/ { sub( /.*\/usr\/share\/zoneinfo\//, "", $2 ); print $2; }' )"
        echo "${zoneinfo}" >> "${TIMEZONE}"
      fi
      echo >> "${TIMEZONE}"
    else
      echo -e "  \"/etc/localtime\" not found.\n"
    fi

    timezone="$( ${IFIND_BIN} -o "${OFFSET}" -n "/etc/timezone" "${SOURCE}" )"
    if [ "${timezone}" != "File not found" ] ; then
      echo -e -n "  Information from \"/etc/timezone\":\n  " >> "${TIMEZONE}"
      ${ICAT_BIN} -o "${OFFSET}" "${SOURCE}" "${timezone}" >> "${TIMEZONE}"
    else
      echo -e "  File \"/etc/timezone\" not found.\n"
    fi
	  echo >> "${TIMEZONE}"
  ) | ${ZENITY_BIN} --progress \
                    --title="timezone" \
                    --text="Please wait..." \
                    --pulsate
else
  echo -e "  ?  (The Sleuth Kit does not support the filesystem!)\n" >> "${TIMEZONE}"
fi

#-------------------------------------------------------------------------------
# Display content of the resultfile "timezone.txt".
#-------------------------------------------------------------------------------
display_resultfile "${TIMEZONE}"

exit 0