justaCasualCoder

ERROR: unable to configure virtual network port: could not open TUN/TAP device: No such file or directory

The error message you are seeing is related to the TUN/TAP device. This device is used to create virtual network interfaces. The error message suggests that the device is not available or not configured correctly.

You can try the following steps to resolve the issue:

1. Kernel module

Check if the TUN/TAP device is loaded by running the command lsmod | grep tun
If it is not loaded, you can load it by running sudo modprobe tun

Resize Ghidra for High DPI screens

If you run Ghidra on a high DPI screen, you will probably find the GUI to be scaled down so small to be almost of no use.

There is a setting that you can adjust to scale the Ghidra GUI:

in $GHIDRA_ROOT/support is a file named launch.properties. In this launch.properties file is the following configuration key:

VMARGS_LINUX=-Dsun.java2d.uiScale=1

Retrieving Docker Image Sizes

There are two metrics that are important to consider when discussing the size of Docker images.

Compressed size - This is often referred to as the wire size. This affects how fast/slow images can be pulled from a registry. This impacts the first run experience on machines where images are not cached.
Uncompressed size - This is often referred to as the size on disk. This affects how much local storage is required to support your Docker workloads.

The example commands shown below will work on Windows, MacOS, and Linux.

How to Measure the Compressed Size

Extracting Existing Kernel + Ramfs

Enter the machine using adb shell

Run cat /proc/partitions

  #  Path                     Purpose        Size
  0 /dev/block/mmcblk0                       7761920
  1 /dev/block/mmcblk0p1      data           6085631

	MTK platform partition meaning

	#Pre-loader
	Pre-loader image
	Handles all the download and secure boot procedure

	#DSP_BL
	DSP Boot Loader
	#MBR、EBR1、EBR2
	Ext4 file system partition index table

	## Netcat server command
	nc -l <unused port # > /dev/null
	eg:
	nc -l 1122 > /dev/null

	## Netcat Client command
	dd if=/dev/zero bs=9100004096 count=1 \| nc <netcat server> <netcat port>
	eg:
	dd if=/dev/zero bs=9100004096 count=1 \| nc 10.0.1.251 1122