English version of Mamachine's mslink.sh

mslink.sh

#!/bin/bash

#############################################################################################
# mslink.sh v1.0
#############################################################################################
# This script allows you to create a Windows Shortcut (.LNK File)
# Script created based on the doc
#   http://msdn.microsoft.com/en-us/library/dd871305.aspx
#############################################################################################

OPTIONS=$(getopt -q -n ${0} -o hl:o:p -l help,lnk-target:,output-file:,printer-link -- "$@")

eval set -- ${OPTIONS}

IS_PRINTER_LNK=0
while true; do
  case "$1" in
    -h|--help) HELP=1 ;;
    -l|--lnk-target) LNK_TARGET="$2" ; shift ;;
    -o|--output-file) OUTPUT_FILE="$2" ; shift ;;
    -p|--printer-link) IS_PRINTER_LNK=1 ;;
    --)        shift ; break ;;
    *)         echo "Unknown option: $1" ; exit 1 ;;
  esac
  shift
done

if [ $# -ne 0 ]; then
  echo "Unknown options: $@"
  exit 1
fi

[ ${#LNK_TARGET} -eq 0 ] || [ ${#OUTPUT_FILE} -eq 0 ] && echo "
Usage:
 ${0} -l target_of_lnk_file -o my_file.lnk [-p]

Options:
 -l, --lnk-target               Specifies the target of the shortcut
 -o, --output-file              The file which to save the shortcut
 -p, --printer-link             Generates a network printer shortcut
" && exit 1

#############################################################################################
# Functions
#############################################################################################

function ascii2hex() {
    echo $(echo -n ${1} | hexdump -v -e '/1 " x%02x"'|sed s/\ /\\\\/g)
}

function gen_IDLIST() {
        ITEM_SIZE=$(printf '%04x' $((${#1}/4+2)))
        echo '\x'${ITEM_SIZE:2:2}'\x'${ITEM_SIZE:0:2}${1}
}

function convert_CLSID_to_DATA() {
    echo -n ${1:6:2}${1:4:2}${1:2:2}${1:0:2}${1:11:2}${1:9:2}${1:16:2}${1:14:2}${1:19:4}${1:24:12}|sed s/"\([A-Fa-f0-9][A-Fa-f0-9]\)"/\\\\x\\1/g
}

#############################################################################################
# Variables from the official Microsoft documentation
#############################################################################################

HeaderSize='\x4c\x00\x00\x00'                                               # HeaderSize
LinkCLSID=$(convert_CLSID_to_DATA "00021401-0000-0000-c000-000000000046")   # LinkCLSID
LinkFlags='\x01\x01\x00\x00'                                                # HasLinkTargetIDList ForceNoLinkInfo 

FileAttributes_Directory='\x10\x00\x00\x00'                                 # FILE_ATTRIBUTE_DIRECTORY
FileAttributes_File='\x20\x00\x00\x00'                                      # FILE_ATTRIBUTE_ARCHIVE

CreationTime='\x00\x00\x00\x00\x00\x00\x00\x00'
AccessTime='\x00\x00\x00\x00\x00\x00\x00\x00'
WriteTime='\x00\x00\x00\x00\x00\x00\x00\x00'

FileSize='\x00\x00\x00\x00'
IconIndex='\x00\x00\x00\x00'
ShowCommand='\x01\x00\x00\x00'                                              # SW_SHOWNORMAL
Hotkey='\x00\x00'                                                           # No Hotkey
Reserved='\x00\x00'                                                         # Unchangeable value
Reserved2='\x00\x00\x00\x00'                                                # Unchangeable value
Reserved3='\x00\x00\x00\x00'                                                # Unchangeable value
TerminalID='\x00\x00'                                                       # Unchangeable value

CLSID_Computer="20d04fe0-3aea-1069-a2d8-08002b30309d"                       # Workstation CLSID
CLSID_Network="208d2c60-3aea-1069-a2d7-08002b30309d"                        # Network     CLSID

#############################################################################################
# Constants found from .lnk file analysis
#############################################################################################

PREFIX_LOCAL_ROOT='\x2f'                                                    # Local Disk
PREFIX_FOLDER='\x31\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'            # Folder
PREFIX_FILE='\x32\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'              # File
PREFIX_NETWORK_ROOT='\xc3\x01\x81'                                          # Network fileserver root
PREFIX_NETWORK_PRINTER='\xc3\x02\xc1'                                       # Network printer    root

END_OF_STRING='\x00'

#############################################################################################

# We remove the final backslash if there is one
LNK_TARGET=${LNK_TARGET%\\}

# We separate the root path of the link from the final target
# We also distinguish whether the link is local or network
# We define the Item_Data value depending on the case of a network or local link

IS_ROOT_LNK=0
IS_NETWORK_LNK=0

if [[ ${LNK_TARGET} == \\\\* ]]; then
    IS_NETWORK_LNK=1
    PREFIX_ROOT=${PREFIX_NETWORK_ROOT}
    Item_Data='\x1f\x58'$(convert_CLSID_to_DATA ${CLSID_Network})

        TARGET_ROOT=${LNK_TARGET%\\*}
        if [[ ${LNK_TARGET} == \\\\*\\* ]]; then
                TARGET_LEAF=${LNK_TARGET##*\\}
        fi
        if [ ${TARGET_ROOT} == \\ ]; then
                TARGET_ROOT=${LNK_TARGET}
        fi
else
    PREFIX_ROOT=${PREFIX_LOCAL_ROOT}
    Item_Data='\x1f\x50'$(convert_CLSID_to_DATA ${CLSID_Computer})

    TARGET_ROOT=${LNK_TARGET%%\\*}
        if [[ ${LNK_TARGET} == *\\* ]]; then
        TARGET_LEAF=${LNK_TARGET#*\\}
        fi
    [[ ! ${TARGET_ROOT} == *\\ ]] && TARGET_ROOT=${TARGET_ROOT}'\'
fi

if [ ${IS_PRINTER_LNK} -eq 1 ]; then
    PREFIX_ROOT=${PREFIX_NETWORK_PRINTER}
    TARGET_ROOT=${LNK_TARGET}
    IS_ROOT_LNK=1
fi

[ ${#TARGET_LEAF} -eq 0 ] && IS_ROOT_LNK=1

#############################################################################################

# Select the prefix that will be used to display the shortcut icon

if [[ ${TARGET_LEAF} == *.??? ]]; then
    PREFIX_OF_TARGET=${PREFIX_FILE}
    TYPE_TARGET="file"
    FileAttributes=${FileAttributes_File}
else
    PREFIX_OF_TARGET=${PREFIX_FOLDER}
    TYPE_TARGET="folder"
    FileAttributes=${FileAttributes_Directory}
fi

# Convert the target values ​​into binary
TARGET_ROOT=$(ascii2hex ${TARGET_ROOT})
TARGET_ROOT=${TARGET_ROOT}$(for i in `seq 1 21`;do echo -n '\x00';done) # Nécessaire à partir de Vista et supérieur sinon le lien est considéré comme vide (je n'ai trouvé nul part d'informations à ce sujet)

TARGET_LEAF=$(ascii2hex ${TARGET_LEAF})

# Create the IDLIST which represents the core of the .lnk file

if [ ${IS_ROOT_LNK} -eq 1 ];then
    IDLIST_ITEMS=$(gen_IDLIST ${Item_Data})$(gen_IDLIST ${PREFIX_ROOT}${TARGET_ROOT}${END_OF_STRING})
else
    IDLIST_ITEMS=$(gen_IDLIST ${Item_Data})$(gen_IDLIST ${PREFIX_ROOT}${TARGET_ROOT}${END_OF_STRING})$(gen_IDLIST ${PREFIX_OF_TARGET}${TARGET_LEAF}${END_OF_STRING})
fi

IDLIST=$(gen_IDLIST ${IDLIST_ITEMS})

#############################################################################################

if [ ${IS_NETWORK_LNK} -eq 1 ]; then
    TYPE_LNK="network"
    if [ ${IS_PRINTER_LNK} -eq 1 ]; then
        TYPE_TARGET="printer"
    fi
else
    TYPE_LNK="local"
fi

echo "Creating a shortcut of type  \""${TYPE_TARGET}" "${TYPE_LNK}"\" with target "${LNK_TARGET} 1>&2

echo -ne ${HeaderSize}${LinkCLSID}${LinkFlags}${FileAttributes}${CreationTime}${AccessTime}${WriteTime}${FileSize}${IconIndex}${ShowCommand}${Hotkey}${Reserved}${Reserved2}${Reserved3}${IDLIST}${TerminalID} > "${OUTPUT_FILE}"