I came across a one-liner script by @gfwrev and got seriously impressed by it. Although it does not work anymore, I still would like to have a writeup on it for its beauty and for the author’s creativity. The one-liner named gfw-looking-glass.sh is as follows: while true; do printf "\0\0\1\0\0\1\0\0\0\0\0\0\6wux.ru\300" | nc -uq1 $SOME_IP 53 | hd -s20; done As shown in the figure below, it was able to print out part of the memory of the GFW. But how? nc nc -uq1 $SOME_IP 53 sends input from ...
