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https://tools.ietf.org/html/rfc1035#section-2.3.1 says (approximately)
that only letters, numbers, and non-leading non-trailing dashes are allowed
(for entries with A/AAAA records). We set no restrictions.
hosts(5) says:
> Host names may contain only alphanumeric characters, minus signs ("-"), and
> periods ("."). They must begin with an alphabetic character and end with an
> alphanumeric character.
nss-files follows those rules, and will ignore names in /etc/hosts that do not
follow this rule.
Let's follow the documented rules for /etc/hosts. In particular, this makes us
consitent with nss-files, reducing surprises for the user.
I'm pretty sure we should apply stricter filtering to names received over DNS
and LLMNR and MDNS, but it's a bigger project, because the rules differ
depepending on which level the label appears (rules for top-level names are
stricter), and this patch takes the minimalistic approach and only changes
behaviour for /etc/hosts.
Escape syntax is also disallowed in /etc/hosts, even if the resulting character
would be allowed. Other tools that parse /etc/hosts do not support this, and
there is no need to use it because no allowed characters benefit from escaping.
Do not treat various errors (missing hostname, invalid address) as fatal,
just warn and continue. /etc/hosts is written by humans and we should not
reject the whole file just because a singly entry is not to our liking.
Handle comments as described in hosts(5):
everything from the comment character until the end of the line should be
ignored.
Fixes#10779.
Add tests.
This has the side effect to upgrade the log level at which the log is emitted
from debug to warning.
This might be better since after all we didn't apply a tmpfiles.d/ rule and
that actually might end up being problematic eventually.
We're always interested into finding unsafe transitions so let's make the
helper return true when it finds such transitions so we don't need to negate
its results.
No functional changes.
and let's emit a more comprehensive warning when an unsafe transition is
encountered.
Before this patch:
Unsafe symlinks encountered in /run/nrpe, refusing.
After:
Detected unsafe path transition / → /run during canonicalization of /run/nrpe.
We previously returned -EPERM but it can be returned for various other reasons
too.
Let's use -ENOLINK instead as this value shouldn't be used currently. This
allows users of CHASE_SAFE to detect without any ambiguities when unsafe
transitions are encountered by chase_symlinks().
All current users of CHASE_SAFE that explicitly reacted on -EPERM have been
converted to react on -ENOLINK.
When using networkd we currently have no way of ensuring that static
neighbor entries are set when our link comes up. This change adds a new
section to the network definition that allows multiple static neighbors
to be set on a link.
This allows us to convey that we are performing multiple link
configuration changes in parallel. This is needed to support configuring
neighbors while simultaneously configuring addresses and routes.
This will be useful to assert that our static route configuration always
happens after address configuration once our individual configure state
goes away.
Fixes the following error:
Failed to mount test /run: No such file or directory
By the time command "./test-udev check" calls function "fake_filesystems",
directory "test/run" must be present.
When there is a failure to setup the environment, the following happens:
1. Command "./test-udev check" exits with non-zero code.
2. Perl function "system" returns the code.
3. The code is evaluated as true by Perl.
Then we stop the test.
Turns out some tests like `test-execute` are tightly coupled with
systemd as PID1 (which should be fixed of course). In the meantime,
let's see how it goes.
Patches are shown on github with a fixed width (no matter how wide the window
is). When line numbers are high (we have some files with 5 digit line numbers),
the diff does not fit, and horizontal scrolling must be used when viewing the
patch. This is super annoying. Let's reduce the width a bit. I think 109 is
still very wide, but at least the github issue should be alleviated.
Much like for the mount units we need fields such as the slice
initialized by the time we activate the swap, hence when the kernel
let's us know about a new swap that appeared we need to initialize the
slice in any Swap object we allocated for that right-away, even if we
can't read the real unit file for the swap device.
