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a) drop handling of obsolete or unused DHCP options time_offset,
mtu_aging_timeout, policy filter, mdr, ttl, ip forwarding settings.
Should this become useful one day we can readd support for this.
b) For subnet mask and broadcast it is not always clear whether 0 or
255.255.255.255 might be valid, hence maintain a boolean indicating
validity next to it.
c) serialize/deserialize broadcast address, lifetime, T1 and T2 together
with the rest of the fields in dhcp_lease_save() and
dhcp_lease_load().
d) consistently return ENODATA from getter functions for data that is
missing in the lease.
e) add missing getter calls for broadcast, lifetime, T1, T2.
f) when decoding DHCP options, generate debug messages on parse
failures, but try to proceed if possible.
g) Similar, when deserializing a lease in dhcp_lease_load(), make sure
we deal nicely with unparsable fields, to provide upgrade compat.
h) fix some memory allocations
refcnt.h only exists for cases where objects are simultaneously handled
by different threads. Otherwise it should not be used. The only case
where this applies is sd_bus, really, and pretty much none of our APIs,
since we do not claim thread-safety for them.
When we make sd-dhcp public one day we really should not make
sd_dhcp_lease_save() and sd_dhcp_lease_load() public, since it's pretty
much only useful as internal utility for networkd itself.
Previoulsy, we just checked whether the domain names specified in
incoming DHCP leases are valid. Given that validation code actually
internally normalizes anyway, it's a good idea to simply do the full
normalization and store that in the lease structure. This allows us to
remove the manual removal of a trailing dot, if there is one.
strv_extend() does not consume the passed entry, hence, we must properly
free it. Furthermore, we should *not* use strv_consume() as we do greedy
allocations on 'ret'; and greedy-allocations should only be used for short
lived objects or caches.
Fix the domainname parser to properly free temporary storage when done.
In our API design, getter-functions don't ref objects. Calls like
foo_get_bar() will not ref 'bar'. We never do that and there is no real
reason to do it in single threaded APIs. If you need a ref-count, you
better take it yourself *BEFORE* doing anything else on the parent object
(as this might invalidate your pointer).
Right now, sd_dhcp?_get_lease() refs the lease it returns. A lot of
code-paths in systemd do not expect this and thus leak the lease
reference. Fix this by changing the API to not ref returned objects.
s/an/any/, as reported by Vito Caputo.
Also mention explicitly that the security properties (i.e. SELinux) are
also isolated when "machinectl shell" is used.
The commit 4938696301 overlooked the
fact that unit files can be specified as unit file paths, not unit
file names, wrongly passing a unit file path to the 1st argument of
manager_load_unit() that handles it as a unit file name. As a result,
the following 4 systemctl subcommands:
enable
disable
reenable
link
mask
unmask
fail with the following error message:
# systemctl enable /usr/lib/systemd/system/kdump.service
Failed to execute operation: Unit name /usr/lib/systemd/system/kdump.service is not valid.
# systemctl disable /usr/lib/systemd/system/kdump.service
Failed to execute operation: Unit name /usr/lib/systemd/system/kdump.service is not valid.
# systemctl reenable /usr/lib/systemd/system/kdump.service
Failed to execute operation: Unit name /usr/lib/systemd/system/kdump.service is not valid.
# cp /usr/lib/systemd/system/kdump.service /tmp/
# systemctl link /tmp/kdump.service
Failed to execute operation: Unit name /tmp/kdump.service is not valid.
# systemctl mask /usr/lib/systemd/system/kdump.service
Failed to execute operation: Unit name /usr/lib/systemd/system/kdump.service is not valid.
# systemctl unmask /usr/lib/systemd/system/kdump.service
Failed to execute operation: Unit name /usr/lib/systemd/system/kdump.service is not valid.
To fix the issue, first check whether a unit file is passed as a unit
file name or a unit file path, and then pass the unit file to the
appropreate argument of manager_load_unit().
By the way, even with this commit mask and unmask reject unit file
paths as follows and this is a correct behavior:
# systemctl mask /usr/lib/systemd/system/kdump.service
Failed to execute operation: Invalid argument
# systemctl unmask /usr/lib/systemd/system/kdump.service
Failed to execute operation: Invalid argument
Internally, the root cgroup is stored as the empty string in
Unit.cgroup_path, and "no cgroup" as NULL. Unfortunately, D-Bus does not
know a NULL concept, hence when reporting the cgroup to clients we
should turn the root cgroup into "/", and leave the empty string for the
"no cgroup" case.
This should make sure that "systemctl status -- -.slice" works correctly
and shows the entire cgroup tree.
