Use /dev/urandom
Use /dev/urandom

http://sockpuppet.org/blog/2014/02/25/safely-generate-random-numbers/
https://speakerdeck.com/filosottile/the-plain-simple-reality-of-entropy

Also remove the iflag=fullblock GNUism that doesn't exist on BSD and OSX

jedisct1/glorytun,jedisct1/glorytun,angt/glorytun,angt/glorytun