> From: "Ben Pfaff" <b...@ovn.org>
> To: d...@openvswitch.org
> Sent: Tuesday, August 8, 2017 2:43:17 PM
> Subject: [ovs-dev] DNS support options
> Open vSwitch currently supports only IP addresses for specifying
> OpenFlow and OVSDB remotes. It would be nice to support DNS names.
> Open vSwitch can't afford to let DNS resolution block processing, so it
> needs some way to resolve DNS asynchronously. I've come up with the
> following solutions so far:
> * Implement it ourselves using threads. Probably, this would be
> a single worker thread that loops through calls to
> * glibc has getaddrinfo_a(), an asynchronous version of
> getaddrinfo(). *BSD and Windows do not have this function, so
> we would still need to implement it ourselves (probably using
> threads) if we adopted this approach, so it might be more work
> than the first solution.
> * Use an external asynchronous DNS library. GNU adns looks like
> a good choice: http://www.chiark.greenend.org.uk/~ian/adns/.
> It has a port to Windows but I don't know whether it's
With adns_beforepoll()/adns_afterpoll(), it looks like adns might be easy
to integrate on top of lib/poll-loop.c. Not requiring a separate thread
seems like a plus.
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