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The name resolver.arpa is reserved for RFC9462 "Discovery of Designated
Resolvers" (DDR). This relies on regular dns queries for SVCB records at
the special use domain name _dns.resolver.arpa. Unfortunately, older
nameservers (or broken ones) won't know about this SUDN and will likely
return NXDOMAIN. If this is cached, the cache entry will become an
impediment for any clients trying to discover designated resolvers
through the stub-resolver, or potentially even sd-resolved itself, were
it to implement DDR.
The RFC recommendation is that "clients MUST NOT perform A or AAAA
queries for resolver.arpa", and "resolvers SHOULD respond to queries of
any type other than SVCB for _dns.resolver.arpa. with NODATA and queries
of any type for any domain name under resolver.arpa with NODATA." which
should help avoid potential compatibility issues. This enforces that
condition within sd-resolved, and avoids caching any such erroneous
NXDOMAIN.
The RFC also recommends requests for this domain should never be
forwarded, to prevent authentication failures. Since there isn't much
point in establishing secure communication to the local stub, we still
allow SVCB to be forwarded from the stub, in case the client cares to
implement some other authentication method and understands the
consequences of skipping the local stub. Normal clients are not
expected to implement DDR, but this change will protect sd-resolved's
own caches in case they try.
Although A and AAAA are prohibited, I think validating resolvers
might reasonably query for dnssec records, even though the resolver.arpa
zone does not exist (it is declared to be a locally served zone). For
this reason, I have also added resolver.arpa to the builtin dnssec NTA.
This brings the handling of config for kernel-install in line with most of
systemd, i.e. we search the set of paths for the main config file, and the full
set of drop-in paths for drop-ins.
This mirrors what 07f5e35fe7 did for udev.conf.
That change worked out fine, so I hope this one will too.
The update in the man page is minimal. I think we should split out a separate
page for the config file later on.
One motivating use case is to allow a drop-in to be created for temporary
config overrides and then removed after the operation is done.
This means the main config file is loaded also from /run and /usr.
We should load the main config file from all the places where we load drop-ins.
I realize I had a giant blind spot: I always assumed that we load config files
from /etc, /run, /usr/local/lib, /usr/lib. But it turns out that we only used
those paths for drop-ins. For the main config file, we only looked in /etc. The
docs actually partially described this behaviour, i.e. most SYNOPSIS sections
and some parts of the text, but not others.
This is strange, because 6495361c7d was completely
bogus with the behaviour before this patch. We had a huge discussion before it
was merged, and clearly nobody noticed this. Similarly, in the previous version
of the current pull request, we had a long discussion about the appropriate
order of directories, and apparently nobody noticed that there was no order,
because only looked in one directory. So the blind spot seems to have been
shared.
Also, systemd-analyze cat-config behaved incorrectly, i.e. its behaviour matches
the new behaviour.
Possibly, in the future it'll make it easier to add support for --root.
The function was partially implementing chroot lookups. It would be given
file names that were prefixed with the chroot, so it would mostly work.
But if any of those files were symlinks, fopen() would do the wrong thing.
Also we don't need locking.
So give 'root' as the argument and use chase_and_fopen_unlocked() to get
proper chroot-aware lookups.
The only place where config_parse_many() is called with root is is repart.c.
So this is a follow-up for e594a3b154 and
34f2fd5096.
Also, use the more correct type of 'const char* const*' for the input strv.
This requires adding the cast in a few places, but also allows to remove some
casts in others.
That's not gramatically correct.
In backlight, change "assocation" to "deduplication". Without the context,
it's probably not clear at all that we "associate" them to ignore them.
This essentially reverts 5656cdfeea. I find it
much easier to understand what is going on when the
path-relative-to-the-search-path is passed in full, instead of being constructed
from two parts, with one of the parts being implicit in some places.
Also, we call 'systemd-analyze cat-config <path>' with <path> with the same
meaning, so this makes the internal and external APIs more consistent.
Follow-up for f274f8bf25
We define *_SLOW_BUS_CALL_TIMEOUT in each component's
own file too. This one is no different and doesn't need
to be in constants.h IMO.
LoongArch does not yet support the `-mgeneral-regs-only` option, so when
compiling for EFI, we need to use the `-mno-lsx` and `-mno-lasx` options
to disable SIMD instructions.
Instead of running meson install and hoping for the best, let's build
distribution packages from the downstream packaging specs. This gets
us the following:
- Vastly simplified mkosi scripts since we don't need a separate initrd
image anymore but can just reuse the default mkosi initrd.
- Almost everything can move to the base image as its not the basis
anymore for the initrd and as such we don't need to care about the
size anymore.
- The systemd packages that get pulled in as dependencies of other
packages get properly uninstalled and replaced with our packages that
we built instead of just installing on top of an existing systemd
installation with no guarantee that everything from that previous
installation was removed.
- Much better testing coverage as what we're testing is much closer
to what will actually be deployed in distributions.
- Immediate feedback if something we change breaks distribution packaging
- We get integration with the distribution for free as we'll automatically
use the proper directories and such instead of having to hack this
into a mkosi build script.
- ...
This works as expected, but coverity warns that it could be ambiguous and context
suggests the other way around. Add brackets to disambiguate.
CID#1535101
Follow-up for 6399be223b
Follow-up for 26d98cdd78
I.e. stat() cannot be used here.
Also, before this commit, the 'X' is only applied if
the owner has execute bit set. Now it takes group and
other into consideration too. setfacl(1) also has
the same behavior.
Let's define this in the generic interface and then import it into the
Monitor interface too.
This is preparation for adding an interface to resolve arbitrary RRs via
Varlink, which means we want the type in both interfaces.
Previously all queries to the reverse mapping domains (in-addr.arpa and
ip6.arpa) were considered to be in-scope for mdns and llmnr at the same
priority as DNS. This caused sd-resolved to ignore NXDOMAIN responses
from dns in favor of lengthy timeouts.
This narrows the scope of mdns and llmnr so they are not invariably
considered as fallbacks for these domains. Now, mdns/llmnr on a link
will only be used as a fallback when there is no suitable DNS scope, and
when that link is DefaultRoute.
