Scrapyd Unauthenticated Remote Code Execution
https://github.com/vulhub/vulhub/tree/master/scrapy/scrapyd-unacc
https://github.com/vulhub/vulhub/tree/master/scrapy/scrapyd-unacc
Bypass firewalls by abusing DNS history
https://github.com/vincentcox/bypass-firewalls-by-DNS-history
https://github.com/vincentcox/bypass-firewalls-by-DNS-history
awesome tutorial for socket programming in C
http://www.cs.rpi.edu/~moorthy/Courses/os98/Pgms/socket.html
http://www.cs.rpi.edu/~moorthy/Courses/os98/Pgms/socket.html