Author Archives: te-bachi

FabLabWinti Filament

Partition MBR/msdos or GPT/EFI/UEFI

$ sudo parted -l
Model: ATA WDC WDS240G2G0A- (scsi)
Disk /dev/sda: 240GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  53.5MB  52.4MB  primary  ntfs
 2      53.5MB  223GB   223GB   primary  ntfs
 3      223GB   223GB   549MB   primary  ntfs         msftres
 4      223GB   240GB   16.8GB  primary  ext4         boot

$ sudo parted -l
Model: ATA Samsung SSD 850 (scsi)
Disk /dev/sda: 120GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 
 
Number  Start   End    Size    File system     Name        Flags
 3      1049kB  269MB  268MB                   gpt-boot
 4      269MB   286MB  16.8MB  fat16           gpt-grub    msftdata
 1      108GB   119GB  10.5GB  ext4            linux-root
 2      119GB   120GB  1074MB  linux-swap(v1)  linux-swap

JavaScript Charts

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Getting Started with Diagramming for JavaScript (V4.0 and above)
Diagramme mit JavaScript und Chart.JS einfach anlegen und anpassen! [TUTORIAL]

dimplejs.org
Introduction to Dimple JS
Aggregating Categorical Variables w/ Dimple.js

JavaScript SVG

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SVG/Tutorials/SVG und JavaScript/Animation
SVG mit CSS und Javascript animieren
When to Use SVG vs. When to Use Canvas
Canvas vs SVG: Choosing the Right Tool for the Job
Difference between SVG and Canvas
Difference between SVG and HTML 5 Canvas

Microsoft Azure

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Tutorials

Solutions

Infrastructure as a Service (IaaS)
Platform as a Service (PaaS)
Software as a Service (SaaS)

Services

analytics
virtual computing
storage
networking

Quick facts to Microsoft Azure

Flexible – Move compute resources up and down as needed
Open – Supports almost any OS, language, tool, or framework
Reliable – 99.95% availability SLA and 24×7 tech support
Global – Data housed in geo-synchronous data centers
Economical – Only pay for what you use

Microsoft Azure Explained: What It Is and Why It Matters
What is Microsoft Azure: How Does It Work and Services
10 reasons why to choose Azure for your Enterprise

YouTube

Raspberry Pi Bare-Metal

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Low Level Learning

EORccS Rn, Rm, Op2 Logically Exclusive OR Op2 with Rm and store the result in Rn. EOR R0,R0,#4

EOR keeps dependencies, so it can’t be executed out of order on a CPU that can OoO execute the mov from xzr

arm-none-eabi-as start.s -o start.o
arm-none-eabi-ld start.o -o kernel.elf
arm-none-eabi-objcopy kernel.elf -O binary kernel7.img

default:
  arm-none-eabi-as -o start.o start.s
  arm-none-eabi-gcc -c -o main.o main.c -I ./include
  arm-none-eabi-gcc -T linker.ld -o kernel7.elf start.o main.o -ffreestanding -O2 -nostdlib -lgcc
  arm-none-eabi-objcopy kernel7.elf -O binary kernel7.img

github.com/lowlevellearning/raspberry-pi-baremetal
github.com/lowlevellearning/raspberry-pi-baremetal-c

The TWO Programming Languages EVERY Beginner Should Start With (to learn how to code fast), C and Python
Baremetal Assembly Raspberry Pi Programming | Direct to Register Blink LED, No Operating System
Raspberry Pi C/C++ Baremetal Programming | Using C to Direct-Register Control Your Raspberry Pi
BAREMETAL RUST Runs on EVERYTHING, Including the Raspberry Pi | Embedded Rust Tutorial

Azeria Labs

ARM Assembly Basics

Writing ARM Assembly
ARM Data Types and Registers
ARM Instruction set
Memory Instructions: Load and Store
Load and Store Multiple
Conditional Execution and Branching
Stack and Functions
Assembly Basics Cheatsheet

INTRODUCTION TO ARM ASSEMBLY BASICS
DATA TYPES
ARM & THUMB
MEMORY INSTRUCTIONS: LOAD AND STORE
LOAD/STORE MULTIPLE
CONDITIONAL EXECUTION
STACK AND FUNCTIONS/a>
ARM ASSEMBLY BASICS CHEATSHEET

ARM Exploit Development

Writing ARM Shellcode
TCP Bind Shell (ARM 32-bit)
TCP Reverse Shell (ARM 32-bit)
Process Memory and Memory Corruption
Stack Overflows (Arm32)
Return Oriented Programming (Arm32)
Stack Overflow Challenges
Process Continuation Shellcode
Introduction to Glibc Heap (malloc)
Introduction to Glibc Heap (free, bins)
Heap Exploit Development (Part 1)
Heap Overflows and iOS Kernel (Part 2)
Grooming the iOS Kernel Heap (Part 3)

INTRODUCTION TO WRITING ARM SHELLCODE

CH32V307

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Manufacturer

AliExpress

Tutorials

GitHub

github.com/openwch/ch32v307

YouTube

Flashing CH32V307 Projects with WCH-Link + MounRiver Studio

Entware on DS220+ / DSM 7.1

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Install Entware

Install on Synology NAS

# wget -O - https://bin.entware.net/x64-k3.2/installer/generic.sh | /bin/sh
Will not apply HSTS. The HSTS database must be a regular and non-world-writable file.
ERROR: could not open HSTS store at '/root/.wget-hsts'. HSTS will be disabled.
--2022-09-03 20:07:12--  https://bin.entware.net/x64-k3.2/installer/generic.sh
Resolving bin.entware.net... 188.114.97.2, 188.114.96.2, 2a06:98c1:3120::e, ...
Connecting to bin.entware.net|188.114.97.2|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2768 (2.7K) [application/octet-stream]
Saving to: 'STDOUT'

-                   100%[===================>]   2.70K  --.-KB/s    in 0s

2022-09-03 20:07:13 (56.5 MB/s) - written to stdout [2768/2768]

Info: Checking for prerequisites and creating folders...
Warning: Folder /opt exists!
Info: Opkg package manager deployment...
Will not apply HSTS. The HSTS database must be a regular and non-world-writable file.
ERROR: could not open HSTS store at '/root/.wget-hsts'. HSTS will be disabled.
--2022-09-03 20:07:13--  http://bin.entware.net/x64-k3.2/installer/opkg
Resolving bin.entware.net... 188.114.97.2, 188.114.96.2, 2a06:98c1:3120::e, ...
Connecting to bin.entware.net|188.114.97.2|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1155888 (1.1M) [application/octet-stream]
Saving to: '/opt/bin/opkg'

/opt/bin/opkg       100%[===================>]   1.10M  --.-KB/s    in 0.1s

2022-09-03 20:07:13 (8.08 MB/s) - '/opt/bin/opkg' saved [1155888/1155888]

Will not apply HSTS. The HSTS database must be a regular and non-world-writable file.
ERROR: could not open HSTS store at '/root/.wget-hsts'. HSTS will be disabled.
--2022-09-03 20:07:13--  http://bin.entware.net/x64-k3.2/installer/opkg.conf
Resolving bin.entware.net... 188.114.97.2, 188.114.96.2, 2a06:98c1:3120::e, ...
Connecting to bin.entware.net|188.114.97.2|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 165 [application/octet-stream]
Saving to: '/opt/etc/opkg.conf'

/opt/etc/opkg.conf  100%[===================>]     165  --.-KB/s    in 0s

2022-09-03 20:07:13 (35.8 MB/s) - '/opt/etc/opkg.conf' saved [165/165]

Info: Basic packages installation...
Downloading http://bin.entware.net/x64-k3.2/Packages.gz
Updated list of available packages in /opt/var/opkg-lists/entware
Installing entware-opt (227000-3) to root...
Downloading http://bin.entware.net/x64-k3.2/entware-opt_227000-3_all.ipk
Installing libgcc (8.4.0-11) to root...
Downloading http://bin.entware.net/x64-k3.2/libgcc_8.4.0-11_x64-3.2.ipk
Installing libc (2.27-11) to root...
Downloading http://bin.entware.net/x64-k3.2/libc_2.27-11_x64-3.2.ipk
Installing libssp (8.4.0-11) to root...
Downloading http://bin.entware.net/x64-k3.2/libssp_8.4.0-11_x64-3.2.ipk
Installing libpthread (2.27-11) to root...
Downloading http://bin.entware.net/x64-k3.2/libpthread_2.27-11_x64-3.2.ipk
Installing librt (2.27-11) to root...
Downloading http://bin.entware.net/x64-k3.2/librt_2.27-11_x64-3.2.ipk
Installing libstdcpp (8.4.0-11) to root...
Downloading http://bin.entware.net/x64-k3.2/libstdcpp_8.4.0-11_x64-3.2.ipk
Installing entware-release (1.0-2) to root...
Downloading http://bin.entware.net/x64-k3.2/entware-release_1.0-2_all.ipk
Installing zoneinfo-asia (2022a-1) to root...
Downloading http://bin.entware.net/x64-k3.2/zoneinfo-asia_2022a-1_x64-3.2.ipk
Installing zoneinfo-europe (2022a-1) to root...
Downloading http://bin.entware.net/x64-k3.2/zoneinfo-europe_2022a-1_x64-3.2.ipk
Installing findutils (4.9.0-1) to root...
Downloading http://bin.entware.net/x64-k3.2/findutils_4.9.0-1_x64-3.2.ipk
Installing terminfo (6.3-1a) to root...
Downloading http://bin.entware.net/x64-k3.2/terminfo_6.3-1a_x64-3.2.ipk
Installing libpcre (8.45-3) to root...
Downloading http://bin.entware.net/x64-k3.2/libpcre_8.45-3_x64-3.2.ipk
Installing grep (3.7-2) to root...
Downloading http://bin.entware.net/x64-k3.2/grep_3.7-2_x64-3.2.ipk
Installing locales (2.27-9) to root...
Downloading http://bin.entware.net/x64-k3.2/locales_2.27-9_x64-3.2.ipk
Installing opkg (2022-02-24-d038e5b6-1) to root...
Downloading http://bin.entware.net/x64-k3.2/opkg_2022-02-24-d038e5b6-1_x64-3.2.ipk
Installing entware-upgrade (1.0-1) to root...
Downloading http://bin.entware.net/x64-k3.2/entware-upgrade_1.0-1_all.ipk
Configuring libgcc.
Configuring libc.
Configuring libssp.
Configuring libpthread.
Configuring librt.
Configuring terminfo.
Configuring libpcre.
Configuring grep.
Configuring locales.
Entware uses separate locale-archive file independent from main system
Creating locale archive /opt/usr/lib/locale/locale-archive
Adding en_EN.UTF-8
Adding ru_RU.UTF-8
You can download locale sources from http://bin.entware.net/other/i18n_glib227.tar.gz
You can add new locales to Entware using /opt/bin/localedef.new
Configuring entware-upgrade.
Upgrade operations are not required.
Configuring opkg.
Configuring zoneinfo-europe.
Configuring zoneinfo-asia.
Configuring libstdcpp.
Configuring entware-release.
Configuring findutils.
Configuring entware-opt.
Info: Congratulations!
Info: If there are no errors above then Entware was successfully initialized.
Info: Add /opt/bin & /opt/sbin to $PATH variable
Info: Add "/opt/etc/init.d/rc.unslung start" to startup script for Entware services to start
Info: Found a Bug? Please report at https://github.com/Entware/Entware/issues

Entware commands

$ sudo opkg list_installed
Password:
entware-opt - 227000-3
entware-release - 1.0-2
entware-upgrade - 1.0-1
findutils - 4.9.0-1
grep - 3.7-2
libc - 2.27-11
libgcc - 8.4.0-11
libpcre - 8.45-3
libpthread - 2.27-11
librt - 2.27-11
libssp - 8.4.0-11
libstdcpp - 8.4.0-11
locales - 2.27-9
opkg - 2022-02-24-d038e5b6-1
terminfo - 6.3-1a
zoneinfo-asia - 2022a-1
zoneinfo-europe - 2022a-1

$ sudo opkg install iperf3
Installing iperf3 (3.11-1) to root...
Downloading http://bin.entware.net/x64-k3.2/iperf3_3.11-1_x64-3.2.ipk
Configuring iperf3.

$ sudo opkg files iperf3
Package iperf3 (3.11-1) is installed on root and has the following files:
/opt/bin/iperf3

$ sudo opkg files iperf3
Package iperf3 (3.11-1) is installed on root and has the following files:
/opt/bin/iperf3

$ sudo opkg install netcat
Installing netcat (0.7.1-2) to root...
Downloading http://bin.entware.net/x64-k3.2/netcat_0.7.1-2_x64-3.2.ipk
Configuring netcat.

$ sudo opkg files netcat
Package netcat (0.7.1-2) is installed on root and has the following files:
/opt/bin/netcat

$ sudo opkg install pigz
Installing pigz (2.4-1) to root...
Downloading http://bin.entware.net/x64-k3.2/pigz_2.4-1_x64-3.2.ipk
Installing zlib (1.2.12-1) to root...
Downloading http://bin.entware.net/x64-k3.2/zlib_1.2.12-1_x64-3.2.ipk
Configuring zlib.
Configuring pigz.

Transfer

Transfer 15TB of tiny files

Source:
$ tar -cf - -C bachman0_2017_03_02 . | pigz | nc -l 9876

Destination:
$ mkdir bachman0_2017_03_02
$ cd bachman0_2017_03_02/
$ sudo netcat 10.0.0.149 9876 | pigz -d | tar -xf - -C .

JavaSE 18

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Wikipedia

Java (programming language)
Java (Programmiersprache)

OpenJDK

JDK 17

Tutorials

baeldung

Differences Between Oracle JDK and OpenJDK
Deep Dive Into the New Java JIT Compiler – Graal

YouTube

Java

Java 8 to 18: Most important changes in the Java Platform
Java 19 – The Best Java Release? – Inside Java Newscast #27

Removed

Access to JDK internals
JAXB / JAXWS / CORBA
Nashorn JS Engine
CMS Garbage Collector
ParallelScavenge+ Serial Old GC
Launch-Time JRE version selection
JVM TI hprof Agent
jhat tool
Native-Header Generation tool (javah)
Pack200
Solaris and SPARC Ports
RMI Activation
Demos and Samples

Deprecated

Biased Locking

Deprecated-for-removal

Applet API
SecurityManager
Value Based Classes constructors
Finalization

No Longer in Oracle JDK

JavaFX
Java Web Start
JRE (and Auto update)
32-bit

Failed experiments

AOT Compiler (9 to 17)
JIT Compiler (10 to 17)

Improving the Java Programming Language

Local-Variable Type Inference – var
Local Variable Syntax for Lambda Parameters
Switch Expressions
Text Blocks
Records / Record Classes/li>
Pattern Matching for instanceof
Sealed Classes
Pattern Matching for switch

Local-Variable Type Inference – var

var url = new URL("http://www.openjdk.com/");
var con = urk.openConnection();
var is = new InputStreamReader(con.getInputStream());
var reader = new BufferedReader(is);

Switch Expressions

return switch(day) {
  case MONDAY, FRIDAY, SUNDAY -> 6;
  case TUESDAY                -> 7;
  case THURSDAY, SATURDAY     -> 8
  case WEDNESDAY              -> 9;
};

Text Blocks

var html += """
  <tr>
    <td>Retweets: %s</td>
    <td>Likes: %s</td>
  </tr>
""".formatted(t.getRetweetCount(),
              t.getLikeCount());

Records / Record Classes

record Point (int x, int y) {}

Pattern Matching for instanceof

if (obj instance of String s) {
    // String s = (String) obj not necessary anymore
}
[/code]

<h4>Sealed Classes</h4>
[java]
public abstract sealed class Shape permits Circle, Rectangle, Square {...}

public final class Circle extends Shape {...}

public sealed class Rectangle extends Shape permits TransparentRectangle,
                                                    FilledRectangle {...}
public final class TransparentRectangle extends Rectangle {...}
public final class FilledRectangle extends Rectangle {...}

public non-sealed class Square extends Shape {...}

Pattern Matching for switch

static String formatterPatternSwitch(Object o) {
  return switch(o) {
    case Integer i -> String.format("int %d", i);
    case Long l    -> String.format("long %d", l);
    case Double d  -> String.format("double %f", d);
    case String s  -> String.format("String %s", s);
    default        -> o.toString();
  };
}

Pattern Matching for switch – Matching null

static String formatterPatternSwitch(Object o) {
  return switch(o) {
    case null      -> "null";
    case Integer i -> String.format("int %d", i);
    case Long l    -> String.format("long %d", l);
    case Double d  -> String.format("double %f", d);
    case String s  -> String.format("String %s", s);
    default        -> o.toString();
  };
}

Keso Rupert

All Java 18 Features In Under 5 Minutes!

400: UTF-8 by Default
408: Simple Web Server
413: Code Snippets in Java API Documentation
416: Reimplement Core Reflection with Method Handles
417: Vector API (Third Incubator)
418: Internet-Address Resolution SPI
419: Foreign Function & Memory API (Second Incubator)
420: Pattern Matching for switch (Second Preview)
421: Deprecate Finalization for Removal

History

Version	Date
JDK Beta	1995
JDK 1.0	January 23, 1996
JDK 1.1	February 19, 1997
J2SE 1.2	December 8, 1998
J2SE 1.3	May 8, 2000
J2SE 1.4	February 6, 2002
J2SE 5.0	September 30, 2004
Java SE 6	December 11, 2006
Java SE 7	July 28, 2011
Java SE 8 (LTS)	March 18, 2014
Java SE 9	September 21, 2017
Java SE 10	March 20, 2018
Java SE 11 (LTS)	September 25, 2018
Java SE 12	March 19, 2019
Java SE 13	September 17, 2019
Java SE 14	March 17, 2020
Java SE 15	September 15, 2020
Java SE 16	March 16, 2021
Java SE 17 (LTS)	September 14, 2021
Java SE 18	March 22, 2022

Q-SoPrA (Qualitative Software for Process Analysis)

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Attributes in Q-SoPrA
Relationships in Q-SoPrA
Drawing parallel edges in Qt
A sign of life

Q-SoPrA (Qualitative Social Process Analysis)

github.com/WouterSpekkink/DynamicNetworks

Tutorials

YouTube

Microsoft

Tobias Wrzal

CloudPingPong

edureka!

freeCodeCamp.org

TechWorld with Nana

Low Level Learning

Azeria Labs

Manufacturer

AliExpress

Tutorials

GitHub

YouTube

Install Entware

Entware commands

Transfer

Wikipedia

OpenJDK

Tutorials

baeldung

YouTube

Java

Local-Variable Type Inference – var

Switch Expressions

Text Blocks

Records / Record Classes

Pattern Matching for instanceof

Pattern Matching for switch

Pattern Matching for switch – Matching null

Keso Rupert

History