See the complaint on #4039. This doesn't fix that particular
issue (it's somewhat unrelated), but does solve around
a file parsing problem reported by @void-in
* Allows responding to AAAA requests in addition to the existing A
support
* Prevents problems when recvfrom returns a mapped address like
"::ffff:192.0.2.1"
Also:
* Fix a few typos
* capture: Don't shadow a method name (arp) with a local variable
* capture: Handle the case where our UDP send hits an ENETUNREACH
Instead of hiding the success notification in vprint, it should print,
but not every time. This fix thottles the notification to ten seconds
per host.
[Fixes#731]