Date: Tue, 5 Jan 2021 09:43:14 -0500 From: Mark Johnston <markj@freebsd.org> To: Vasily Postnicov <shamaz.mazum@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: DNS using Name Service Switch module and Casper Message-ID: <X/R7Ahz8sz5v%2BoFa@raichu> In-Reply-To: <CADnZ6Bke=9%2B_pMc6rkbheNUWS-H6_X14%2Bf%2BWz5cfUCD=BTwk=g@mail.gmail.com> References: <CADnZ6Bke=9%2B_pMc6rkbheNUWS-H6_X14%2Bf%2BWz5cfUCD=BTwk=g@mail.gmail.com>
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On Tue, Jan 05, 2021 at 10:02:37AM +0300, Vasily Postnicov wrote: > Hello. I wrote a simple daemon called ZeroDNS which provides functionality > similar to multicast DNS, namely it discovers other participating machines > over the LAN and stores their hostname and IPv4 address pairs. > > Here is a NSS module which allows the system to use information from that > daemon: > https://github.com/shamazmazum/nss-zero-dns > > You need to modify /etc/nsswitch.conf, changing the line 'hosts: files dns' > to 'hosts: files dns zerodns'. > > It all works on FreeBSD 12.2-RELEASE, but sometimes not on 13.0-CURRENT. > For example, ping(8) just blocks when trying to ping a host whose name is > resolvable with ZeroDNS. Turns out that programs built with casper support > (like ping(8) and some others) stop working with my NSS module (they just > block trying to resolve the name). Presumably it's the casper process (i.e., cap_dns) that uses your module? If the main ping process is blocked trying to resolve a name, it's waiting for the cap_dns process - where exactly is it getting stuck? > Is there some kind of manual on how to write casper-compatible NSS modules?
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