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Re: PROPSAL: import Apple's mDNSResponder
I'm planning to do the first round of commits next week. I should note
that mDNS was already on the 6.0 roadmap, so I consider the question
of wether we want the functionality settled. Nobody objected to the
plan for getting there, so I'm moving forward.
- It should be noted that dhcpcd implements RFC3927 for IPv4 Link-
Local addresses, so we already have the other half of zeroconf covered.
- the daemon will be called mdnsd, and will be off by default. It will
run under user _mdnsd.
- there will be a MKMDNS=no option for the luddites ;-)
- client library will be separate (libdns_sd). Although a libc-built-
in client and nss implementation would make it possible to share some
code and avoid duplication of functionality, I didn't see a strong
enough justification for including it in libc right now (and it's a
lot easier to move code into libc later than out of it)
- On closer inspection the dns-sd(1) license is not APSL but a
proprietary license that seems equivalent to BSD 3-clause, while
managing to avoid being OSI-recognized by being mostly different text.
I don't think this is a barrier for NetBSD inclusion so I now plan to
ship dns-sd(1), but I have enquired about relicensing this to standard
BSD 3-clause to avoid confusion and to make life easier on our adopters.
- I won't be shipping the other debugging/demo apps.
I have been writing a new nss_mdns nameswitch plugin (eg "hosts: files
mdns dns" in /etc/nsswitch.conf). It's now fully functional and
already works better than the pkgsrc one in one important way (handles
scoped v6 link-local addresses correctly).
However, there are a few tweaks to do and I want to add a new function
to libc to make writing getaddrinfo plugins a little more sane, so I
expect to do that in a later commit. There will be no DNS-SD
functionality in nss_mdns, any more than there is in the current dns
module. That needs to be addressed as a separate project (likely
involves changing the ABI of getaddrinfo plugins). I may look at that
later, but it's not directly part of this project.
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