ntrprtr 2.0.0

Interpret bytes through different customizable actions

Description

Interpret bytes through different customizable actions

Installation

pip install ntrprtr

Configuration

In order to interpet the given bytes, you need to provide a .json file with the following structure:

{
    "name": "ntrprtr example",
    "description": "This is a description within the result",
    // Specify as many ntrprtr objects as you want
    "ntrprtr": [
        {
            "name": "Enter the name here..",
            "description": "Provide description here..",
            "start": 0,  // The start byte from where you want to interpret
            "end": 10,   // The end byte where interpreting shall stop
            "action": [   
                        // --> Specify as many actions as you want
                        // --> Each action will be applied to the specified bytes
                        // --> You do not need to provide an action
                        // --> Output is a list of tuples (more information in example section)
                        // --> The actions are specified below
            ]
        }
    ]
}    

The following actions are available:

// Get the decimal value of the given bytes.
// Specify if you want to interpret it as little or big endian
{
    "type": "decimal",
    "endianess": "little|big" // Default: little
}

// Get the binary value of the given bytes.
// Specify if you want to interpret it as little or big endian
{
    "type": "binary",
    "endianess": "little|big" // Default: little
}

// Get the ascii representation of the given bytes.
// If a non ascii value is there, specify a placeholder
{
    "type": "ascii",
    "nonAsciiPlaceholder": "." // Default: .
}

// Get the unicode representation of the given bytes.
{
    "type": "unicode"
}

// Provides a hexdump for the given bytes
// If a non ascii value is there, specify a placeholder
{
    "type": "hexdump",
    "nonAsciiPlaceholder": "." // Default: .
}

// Compare the given bytes against your own values:
// Specify if you want to interpret it as little or big endian
// Specify a result if there is no match
{
    "type": "equals",
    "endianess": "little|big", // Default: big
    // Add as many objects as you want to the "cmp" list
    "cmp": [{
                // The value you want to compare with the given bytes
                "value": "1D1E", 
                // A description which will be added to the result, 
                // if the given bytes matches "value"         
                "description": "Compare 1"      
            },{
                "value": "1D1",
                "description": "Compare 2"
            }],
    // The result if there was no match 
    "noMatch": "No Match found!" // Default: No match found!
}

// Compare the bits of the given bytes against your own values
// Important: Provide leading zeros
// Specify if you want to interpret it as little or big endian
// Specify a result if there is no match
{
    "type": "bitequals",
    "endianess": "little|big", // Default: big
    // Add as many objects as you want to the "cmp" list
    "cmp": [{
                // The bits you want to compare
                "value": "01110111",
                // Description to be added to the result,
                // if bits machtes "value"
                "description": "Bits are equal"
            }],
    // The result if there was no match 
    "noMatch": "Bits are not equal!" // Default: No match found!
}

// Interprets 2 Bytes as DOS time - format hour:minute:seconds
// Specify if you want to interpret it as little or big endian
{
    "type": "dostime",
    "endianess": "little|big" // Default: little
}

// Interprets 2 Bytes as DOS date - format day.month.year
// Specify if you want to interpret it as little or big endian
{
    "type": "dosdate",
    "endianess": "little|big" // Default: little
}

Options

python -m ntrprtr --mode {config,interpret} [--amount AMOUNT] [--name NAME] [--target TARGET] [--config CONFIG] [--result RESULT] [--offset OFFSET] [--bytes BYTES]

---

General

Option	Short	Type	Default	Description
--mode	-p	String	-	config = Create a configuration template interpret = Overview of disk space usage
--offset	-o	Int	-	The offset in bytes to start reading

---

mode = config

Option	Short	Type	Default	Description
--amount	-a	Int	1	Create a config with the given number of objects
--name	-n	String	config.json	Name of the config file to be created

---

mode = interpret

Option	Short	Type	Default	Description
--target	-t	String	-	Path to file which shall be interpreted
--config	-c	String	-	Path to config file
--result	-r	String	-	Path to result file
--offset	-o	Int	0	Offset in bytes to start reading
--bytes	-b	Int	0	No. of bytes to read starting from offset
--disableHashing	-d	Bool	False	True if hashing shall be disabled False otherwise

Example

Shell:

# Create a config template
python -m ntrprtr -m config -a 10 -n ntrprtr-config.json

# Interprets example.dd with config.json
python -m ntrprtr -m interpret -t path/to/example.dd -c config.json

# Interprets example.dd with config.json and write it to result.txt
python -m ntrprtr -m interpret -t path/to/example.dd -c config.json -r result.txt

# Interprets example.dd starting at offset 42 with length of 10 bytes applying config.json
python -m ntrprtr -m interpret -t path/to/example.dd -c config.json -o 42 -b 10

# Interprets example.dd starting at offset 42 with length of 10 bytes applying config.json
# Disable Hashing for big files
python -m ntrprtr -m interpret -t path/to/example.dd -c config.json -o 42 -b 10 -d True

Programmatically:

Given bytes to interpret:

00 01 02 03 04 04 06 07 08 09 0A 0B 0C 0D 0E 0F 
68 61 6C 6C 6F 20 77 6F 72 6C 64 1B 1C 1D 1E 1F
43 B7 67 42 00 00 00 00 00 00 00 00 00 00 00 00
79 00 5F 00 30 00 31 00 2E 00 6A 00

Use the following config.json:

{
    "name": "ntrprtr example",
    "description": "This is a description within the result",
    "ntrprtr": [
        {
            "name": "first-byte-with-no-action",
            "description": "No action",
            "start": 0,
            "end": 2
        },
        {
            "name": "first-bytes",
            "description": "First three bytes",
            "start": 0,
            "end": 2,
            "action": [
                {
                    "type": "decimal",
                    "endianess": "little"
                }
            ]
        },
        {
            "name": "bin-bytes",
            "description": "Binary bytes",
            "start": 2,
            "end": 3,
            "action": [
                {
                    "type": "binary",
                    "endianess": "little"
                }
            ]
        },
        {
            "name": "ascii-bytes",
            "description": "Ascii values",
            "start": 16,
            "end": 26,
            "action": [
                {
                    "type": "ascii",
                    "nonAsciiPlaceholder": "."
                }
            ]
        },
        {
            "name": "hexdump-bytes",
            "description": "Hexdump values",
            "start": 0,
            "end": 3,
            "action": [
                {
                    "type": "hexdump",
                    "nonAsciiPlaceholder": "."
                }
            ]
        },
        {
            "name": "equals-bytes",
            "description": "Test equals",
            "start": 29,
            "end": 30,
            "action": [
                {
                    "type": "equals",
                    "endianess": "big",
                    "cmp": [
                        {
                            "value": "1D1E",
                            "description": "Compare 1"
                        },
                        {
                            "value": "1D1",
                            "description": "Compare 2"
                        }
                    ],
                    "noMatch": "No Match found!"
                }
            ]
        },
        {
            "name": "bitEquals",
            "description": "Bit equality",
            "start": 22,
            "end": 22,
            "action": [
                {
                    "type": "binary",
                    "endianess": "big"
                },
                {
                    "type": "bitequals",
                    "endianess": "big",
                    "cmp": [
                        {
                            "value": "01110111",
                            "description": "Bits are equal!"
                        }
                    ],
                    "noMatch": "Bits are not equal!"
                }
            ]
        },
        {
            "name": "dos-time-bytes",
            "description": "DOS time bytes",
            "start": 32,
            "end": 33,
            "action": [
                {
                    "type": "dostime",
                    "endianess": "little"
                }
            ]
        },
        {
            "name": "dos-date-bytes",
            "description": "DOS date bytes",
            "start": 34,
            "end": 35,
            "action": [
                {
                    "type": "dosdate",
                    "endianess": "little"
                },
                {
                    "type": "dostime",
                    "endianess": "little"
                }
            ]
        },
        {
            "name": "unicode-bytes",
            "description": "unicode repr.",
            "start": 48,
            "end": 59,
            "action": [
                {
                    "type": "unicode"
                }
            ]
        }
    ]
}

Use it programmatically:

import json

from ntrprtr.ByteInterpreter import ByteInterpreter
from ntrprtr.printer.Printer import Printer

configPath = "config.json"
pathToFile = "example.dd" # Contains the above bytes


fileHandle = open(pathToFile, "rb")
testBytes = fileHandle.read()

configHandle = open(configPath, encoding="utf8")
config = json.load(configHandle)

b = ByteInterpreter(testBytes, config["ntrprtr"])
result = b.interpret()

# If you want a standard output use Printer
p = Printer()
p.print(result, config["name"], config["description"])

The result is a list of tuples:

[
    #       Result: [0] = Name, [1] = Description, [2] = Start Byte, [3] = End Byte, [4] = Bytes, [5] = List(ActionResult)
    # ActionResult: [0] = Type, [1] = Result
    ('first-byte-with-no-action', 'No action', 0, 2, bytearray(b'\x00\x01\x02'), [('None', '-')])
    ('first-bytes', 'First three bytes', 0, 2, bytearray(b'\x00\x01\x02'), [('decimal', 258)]), 
    ('bin-bytes', 'Binary bytes', 2, 3, bytearray(b'\x02\x03'), [('binary', '0000 0011 0000 0010')]), 
    ('ascii-bytes', 'Ascii values', 16, 26, bytearray(b'hallo world'), [('ascii', 'hallo world')]), 
    ('hexdump-bytes', 'Hexdump values', 0, 3, bytearray(b'\x00\x01\x02\x03'), [('hexdump', 'see below')]), 
    ('equals-bytes', 'Test equals', 29, 30, bytearray(b'\x1d\x1e'), [('equals', 'Compare 1')]), 
    ('bitEquals', 'Bit equality', 22, 22, bytearray(b'w'), [('binary', '0111 0111'), ('bitequals', 'Bits are equal!')]), 
    ('dos-time-bytes', 'DOS time bytes', 32, 33, bytearray(b'C\xb7'), [('dostime', '22:58:6')]), 
    ('dos-date-bytes', 'DOS date bytes', 34, 35, bytearray(b'gB'), [('dosdate', '7.3.2013')]), 
    ('unicode-bytes', 'unicode repr.', 48, 59, bytearray(b'y\x00_\x000\x001\x00.\x00j\x00'), [('unicode', 'y_01.j')])]

The output from printer looks like the following:

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

ntrprtr by 5f0
Interpret bytes through different customizable actions

Current working directory: path/to/ntrprtr
        Investigated File: path/to/example.dd

                      MD5: 3f8555928a712492c23ca27fb142ebe2
                   SHA256: 715899b61bf6a6aa02adac9124db94e74ec4f7e837acb7ed7a361acd10045b63

          Offset in Bytes: 0

Datetime: 10/11/1970 10:11:12

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

ntrprtr example
---------------
This is a description within the result


Analysis
--------

--> No action
    --------------
    Start Byte: 0
      End Byte: 2
    --------------
     Bytes: 
            00 01 02
    --------------
    Action: 
            none
    Result: 
            -


--> First three bytes
    --------------
    Start Byte: 0
      End Byte: 2
    --------------
     Bytes: 
            00 01 02
    --------------
    Action: 
            decimal
    Result: 
            131328


--> Binary bytes
    --------------
    Start Byte: 2
      End Byte: 3
    --------------
     Bytes: 
            02 03
    --------------
    Action: 
            binary
    Result: 
            0000 0011 0000 0010


--> Ascii values
    --------------
    Start Byte: 16
      End Byte: 26
    --------------
     Bytes: 
            68 61 6C 6C 6F 20 77 6F 72 6C 64
    --------------
    Action: 
            ascii
    Result: 
            hallo world


--> Hexdump values
    --------------
    Start Byte: 0
      End Byte: 3
    --------------
     Bytes: 
            See below
    --------------
    Action: 
            hexdump
    Result: 

              Offset   00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F    ASCII           
            --------   -----------------------------------------------    ---------------- 
                   0   00 01 02 03                                        ....             
            

--> Test equals
    --------------
    Start Byte: 29
      End Byte: 30
    --------------
     Bytes: 
            1D 1E
    --------------
    Action: 
            equals
    Result: 
            Compare 1


--> Bit equality
    --------------
    Start Byte: 22
      End Byte: 22
    --------------
     Bytes: 
            77
    --------------
    Action: 
            binary
    Result: 
            0111 0111
    --------------
    Action: 
            bitequals
    Result: 
            Bits are equal!


--> DOS time bytes
    --------------
    Start Byte: 32
      End Byte: 33
    --------------
     Bytes: 
            43 B7
    --------------
    Action: 
            dostime
    Result: 
            22:58:6


--> DOS date bytes
    --------------
    Start Byte: 34
      End Byte: 35
    --------------
     Bytes: 
            67 42
    --------------
    Action: 
            dosdate
    Result: 
            7.3.2013
    --------------
    Action: 
            dostime
    Result: 
            8:19:14


--> unicode repr.
    --------------
    Start Byte: 48
      End Byte: 59
    --------------
     Bytes: 
            79 00 5F 00 30 00 31 00 2E 00 6A 00
    --------------
    Action: 
            unicode
    Result: 
            y_01.j

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

Execution Time: 0.000976 sec

License

MIT