[jesusprubio]

About the option to pass other services I agree, answered here: https://news.ycombinator.com/item?id=20028483

About DoS attack, I think you need to review how those work, the library is not implementing amplification or something similar.

[dsl]

Did you get permission from OpenDNS and Icanhazip? If not, you are effectively launching a distributed attack against them with worthless traffic.

If you don't understand what I mean - just pull the project and do some more research before you release something like this.

[jesusprubio]

Launching a distributed attack by publishing a crate which makes one request? XD

You can relax, I know how they work. My final year project was about DoS. I would send you the link but it's Spanish.

But I can say you I've written a tool to implement this vector (among others) against VoIP services and it was presented even at the BlackHat conference.

[dsl]

http://pages.cs.wisc.edu/~plonka/netgear-sntp/