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When the link goes down, DHCP client_receive_message*() functions return an
error and the related I/O source is removed from the main loop. With the
current implementation of systemd-networkd this doesn't matter because the DHCP
client is always stopped on carrier down and restarted on carrier up. However
it seems wrong to have the DHCP client crippled (because no packet can be
received anymore) once the link goes temporarily down.
Change the receive functions to ignore a ENETDOWN event so that the client will
be able to receive packets again after the link comes back.
Paths are limited to BUS_PATH_SIZE_MAX but the maximum size is anyway too big
to be allocated on the stack, so let's switch to the heap where there is a
clear way to understand if the allocation fails.
Even though the dbus specification does not enforce any length limit on the
path of a dbus message, having to analyze too long strings in PID1 may be
time-consuming and it may have security impacts.
In any case, the limit is set so high that real-life applications should not
have a problem with it.
* Current logic:
For each NSEC RR find the common suffix between the owner name and
the next name, append asterisk to that suffix and check that
generated wildcard is covered by the NSEC RR in question.
* New logic:
Find NSEC RR covering queried name, generate wildcard as
<asterisk>.<closest encloser> using this RR, then check if any
of the NSEC RRs covers generated wildcard.
This adds a new bitfield to `execute_directories()` which allows to
configure whether to ignore non-zero exit statuses of binaries run and
whether to allow parallel execution of commands.
In case errors are not ignored, the exit status of the failed script
will now be returned for error reposrting purposes or other further
future use.
FRA_TUN_ID is a 64 big endian integer. Fix the policy.
FRA_TUN_ID is unused by networkd, hence I think this bug
has no actual consequences.
Fixes: bce67bbee3
inet_ntop() is not documented to be thread-safe, so it should not
be used in the DHCP library. Arguably, glibc uses a thread local
buffer, so indeed there is no problem with a suitable libc. Anyway,
just avoid it.
The DHCP client should not pre-filter addresses beyond what RFC
requires. If a client's user (like networkd) wishes to skip/filter
certain addresses, it's their responsibility.
The point of this is that the DHCP library does not hide/abstract
information that might be relevant for certain users. For example,
NetworkManager exposes DHCP options in its API. When doing that, the
options should be close to the actual lease.
This is related to commit d9ec2e632d
(dhcp4: filter bogus DNS/NTP server addresses silently).
The Router DHCP option may contain a list of one or more
routers ([1]). Extend the API of sd_dhcp_lease to return a
list instead of only the first.
Note that networkd still only uses the first router (if present).
Aside from extending the internal API of the DHCP client, there
is almost no change in behavior. The only visible difference in
behavior is that the "ROUTER" variable in the lease file is now a
list of addresses.
Note how RFC 2132 does not define certain IP addresses as invalid for the
router option. Still, previously sd_dhcp_lease_get_router() would never
return a "0.0.0.0" address. In fact, the previous API could not
differenciate whether no router option was present, whether it
was invalid, or whether its first router was "0.0.0.0". No longer let
the DHCP client library impose additional restrictions that are not
part of RFC. Instead, the caller should handle this. The patch does
that, and networkd only consideres the first router entry if it is not
"0.0.0.0".
[1] https://tools.ietf.org/html/rfc2132#section-3.5
deserialize_in_addrs() allocates the buffer before trying to parse
the IP address. Since a parsing error is silently ignored, the returned
size might be zero. In such a case we shouldn't return any buffer.
Anyway, there was no leak, because there are only two callers like
r = deserialize_in_addrs(&lease->dns, dns);
which both keep the unused buffer and later release it.
Note that deserialize_in_addrs() doesn't free the pointer before
reassigning the new output. The caller must take care to to pass
"ret" with an allocated buffer that would be leaked when returning
the result.
- RTA_OIF has no business in the routing-rule policy. It is numerical
identical to FRA_GOTO. Fix using the correct enum value. Note that
RTA_OIF/FRA_GOTO was not used by networkd, and the type was already
correct at uint32. So, there is no change in behavior.
- RTA_GATEWAY also does not belong to the routing-rules. It is numerical
identical to FRA_UNUSED2. Obviously, that value is unused as well,
so there is no actual change in behavior either. In particular
that is because:
- kernel would not send messages with FRA_UNUSED2 attribute.
- networkd would not try to parse/send RTA_GATEWAY/FRA_UNUSED2
attributes.
Fixes: bce67bbee3
Initially, the check was that /usr is not a separate fs, and was later relaxed
to allow /usr to be mounted in the initramfs. Documentation was updated in 9e93f6f092,
but this comment wasn't. Let's update it too.
Fixes#10256.
What works:
systemd-analyze cat-config systemd/system-preset
systemd-analyze cat-config systemd/user-preset
systemd-analyze cat-config tmpfiles.d
systemd-analyze cat-config sysusers.d
systemd-analyze cat-config systemd/sleep.conf
systemd-analyze cat-config systemd/user.conf
systemd-analyze cat-config systemd/system.conf
systemd-analyze cat-config udev/udev.conf
(and other .conf files)
systemd-analyze cat-config udev/rules.d
systemd-analyze cat-config environment.d
systemd-analyze cat-config environment
Directories may be specified with the trailing dash or not.
The caveat is that for user configuration, systemd and other tools also look
at ~/.config/. It would be nice to support this, but this patch doesn't.
"cat-config --user" is rejected, and we may allow it in the future and then
extend the search path with directories under ~/.config.
What doesn't work (and probably shouldn't because those files cannot be
meaningfully concatenated):
systemd-analyze cat-config systemd/system (.service, .slice, .socket, ...)
systemd-analyze cat-config systemd/user
systemd-analyze cat-config systemd/network (.network, .link, and .dnssd)
The hardcoding of information about paths in this manner is a bit ugly, but
OTOH, it is not too onerous, and at least we have one place where all the
schemes are "documented" through code. It'll make us think twice before adding
yet another slightly different scheme.
This adds /usr/local/lib/udev/rules.d to the search path on non-split-usr systems.
On split-usr systems, the paths with /usr/-prefixes are added too.
In the past, on split-usr systems, it made sense to only load rules from
/lib/udev/rules.d, because /usr could be mounted late. But we don't support running
without /usr since 80758717a6, so in practice it doesn't matter whether the
rules files are in /lib/udev/rules.d or /usr/lib/udev/rules.d. Distributions
that maintain the illusion of functional split-usr are welcome to simply not put any
files in /usr/lib/udev/rules.d/.
In practice this doesn't change much, but it makes udev more consistent with the
rest of the systemd suite.
This makes the code match documentation (opposite compared to previous
commits). This is user configuration, hence it should not depend on stuff
in /lib/ even when split-usr is used.
/usr/local/lib/systemd/dnssd is now also included in the search path. This
path is of limited usefulness, but it makes sense to be consistent.
Documentation is updated to match. Outdated advice against drop-ins in /usr
is removed.
standard-conf.xml is currently included by:
man/binfmt.d.xml
man/environment.d.xml
man/modules-load.d.xml
man/sysctl.d.xml
man/coredump.conf.xml
man/journal-remote.conf.xml
man/journal-upload.conf.xml
man/journald.conf.xml
man/logind.conf.xml
man/networkd.conf.xml
man/resolved.conf.xml
man/systemd-sleep.conf.xml
man/systemd-system.conf.xml
All those programs actually use CONF_PATHS_NULSTR or CONF_PATHS_STRV,
so this changes the documentation to match code.
