These-days

突如其来的就想用英语写点东西了，好，就用英语写篇不算日记的日记吧。

Let’s talk about what i have done these days…

First, I took part in a CTF game and tried to figured out a problem which ask me to find a flag in a broken disk image.And, my disk was broken….

Second, my GPT(GUID Partition Table) was broken and I lost lots of files.

Third, I changed my HHD to a SSD.

Not all yet.

Finally I found all my files without filenames….OMG!

Can you imagine that thousands of files laying there and the filenames are totally numbers? Yes, I can.

Filename maybe very important to windows system but for me, a ubuntu user, it’s not a matter. Because the system can not only identify the file by its name but also its file head. That’s to say, the filename is not necessary to it, usually it’s for our human beings to recognize it. And luckily I got a file command to recognize the file. So, I can pick up all the JPG files and all the PNG files and the others.

But, they still didn’t have filename extensions.

Here is my script to tell them apart. Quiet stupid… And I have to “ls” the filenames to a text file and split them in four or more to run more scripts at the same time.

#!/bin/bash
while read -r line
do
    file_name=$line

file_info=`file -b $file_name`

if [[ `echo $file_info | grep 'JPEG image data'` ]]; then
    mv $file_name $file_name.jpg
    elif [[ `echo $file_info | grep 'gzip'` ]]; then
        mv $file_name $file_name.tar.gz
    elif [[ `echo $file_info | grep 'Matroska data'` ]]; then # mv 2 floders
        mv $file_name Matroska_data/
    elif [[ `echo $file_info | grep 'ISO Media, MPEG v4 system, iTunes AAC-LC'` ]]; then
            mv $file_name ISO_media_iTunes/
    elif [[ `echo $file_info | grep 'kbps'` ]]; then
            mv $file_name music_kbps/
    elif [[ `echo $file_info | grep 'PNG image data'` ]]; then
        mv $file_name $file_name.png
    elif [[ `echo $file_info | grep 'HTML document'` ]]; then
        mv $file_name $file_name.html
    elif [[ `echo $file_info | grep 'PHP script'` ]]; then
        mv $file_name $file_name.php
    elif [[ `echo $file_info | grep 'C++ source, ASCII text'` ]]; then
        mv $file_name $file_name.cpp
    elif [[ `echo $file_info | grep 'C source'` ]]; then
        mv $file_name $file_name.c
    elif [[ `echo $file_info | grep 'GIF image data'` ]]; then
        mv $file_name $file_name.gif
    elif [[ `echo $file_info | grep 'XML document text'` ]]; then
        mv $file_name $file_name.xml
    elif [[ `echo $file_info | grep 'Microsoft Word'` ]]; then
        mv $file_name $file_name.doc
    elif [[ `echo $file_info | grep 'Microsoft Excel'` ]]; then
        mv $file_name $file_name.xls
    elif [[ `echo $file_info | grep 'directory'` ]]; then
        mv $file_name directorys/
    elif [[ `echo $file_info | grep 'PDF document'` ]]; then
        mv $file_name $file_name.pdf 
    elif [[ `echo $file_info | grep 'Zip archive data'` ]]; then
        mv $file_name $file_name.zip
    elif [[ `echo $file_info | grep 'Composite Document File V2 Document'` ]]; then
        mv $file_name $file_name.doc
    elif [[ `echo $file_info | grep 'UTF-8 Unicode text'` ]]; then
        mv $file_name $file_name.txt
    elif [[ `echo $file_info | grep 'Audio file with ID3'` ]]; then
        mv $file_name $file_name.mp3
    elif [[ `echo $file_info | grep 'ISO Media, MPEG v4 system, 3GPP'` ]]; then
        mv $file_name $file_name.3gp
    elif [[ `echo $file_info | grep 'ISO Media, MPEG v4 system, version'` ]]; then
        mv $file_name $file_name.mp4
    elif [[ `echo $file_info | grep 'GIMP XCF image data'` ]]; then
        mv $file_name $file_name.gimp 
    elif [[ `echo $file_info | grep 'PE32 executable (console)'` ]]; then
        mv $file_name $file_name.exe 
    elif [[ `echo $file_info | grep 'PE32 executable (DLL)'` ]]; then
        mv $file_name $file_name.exe 
    elif [[ `echo $file_info | grep 'Microsoft Cabinet archive data'` ]]; then
        mv $file_name windows_archive/
    elif [[ `echo $file_info | grep 'RAR archive data'` ]]; then
        mv $file_name $file_name.rar
    elif [[ $file_info == "data" ]]; then
        mv $file_name data/
    elif [[ $file_info == "ASCII text" ]]; then
        mv $file_name ascii_test
    elif [[ $file_info == "SO-8859 text" ]]; then
        mv $file_name so-8558-text
else
    echo $file_info >> file_info
fi
done < $1

It’s really a hard job…really…

Till now…

Now let’s saying something about the SSD. One word – fast! Only 30 seconds to startup (Notice that I encrypted my disk). And only one seconds to start Firefox and less for Chrome~

There are many tutorials to teach you what to do after setup an SSD, so, here is nothing to teach.

One more, you must format the SSD first or you will waste lot of time to realize that. Remember, the factory won’t do that for you.

I also buy a disk enclosure to put my HDD in it. Then, I got a portable hard drive, I can put the backups there.

These days I also tried to install more OS to the portable hard drive, but except Ubuntu, all my tries failed. Maybe it’s a wrong decision, so, I quit. Using Kali via Virtual box is not that worse, after all I got a SSD. :)

And tonight I found an interesting thing that I can write a space in markdown~ Oh, not that space, it’s, em… let me tell you the difference:

  • That is a space: " “;

  • That is another kind of space: "　“;

So, can you see that?

Of cause not. Because I edit them in hex editor. Which the first space is “20” and the second one is “E3 80 80”. If you search “E3 80 80 “, you’ll get more.Here is the link.

And you can copy the two “spaces” to a text editor and reopen it by a hex editor after you save it. You can see that one is “20”, and the other is “E3 80 80”.

Markdown only regard “20” as a space but in Unicode, “E3 80 80” is also a space while markdown didn’t know that. So, we can do many things via this “characteristic”, for example, XSS. Actually, many other languages also didn’t know “E3 80 80” or the other Unicode brothers. And just now he told me that there was a serious bug in Unicode. Sad..

Okay, 1:31 am now.

Time to sleep.

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