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  CVE-2019-5475 Nexus Repository Manager 2 - OS Command Injection  (authenticated)
  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