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core: fix bus name synchronization after daemon-reload
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sd-event: improve debugging of event source errors
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Printing the pointer variable really doesn't help, so drop that.
Instead, add a string lookup table for the EventSourceType enum, and print
the type of event source in case of errors.
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man: fix typo in systemctl(1)
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During daemon-reload, PID1 temporarly loses its DBus connection, so there's
a small window in which all signals sent by dbus-daemon are lost.
This is a problem, since we rely on the NameOwnerChanged signals in order to
consider a service with Type=dbus fully started or terminated, respectively.
In order to fix this, a rewrite of bus_list_names() is necessary. We used
to walk the current list of names on the bus, and blindly triggered the
bus_name_owner_change() callback on each service, providing the actual name
as current owner. This implementation has a number of problems:
* We cannot detect if the the name was moved from one owner to the other
while we were reloading
* We don't notify services which missed the name loss signal
* Providing the actual name as current owner is a hack, as the comment also
admits.
To fix this, this patch carries the following changes:
* Track the name of the current bus name owner, and (de-)serialize it
during reload. This way, we can detect changes.
* In bus_list_names(), walk the list of bus names we're interested in
first, and then see if the name is active on the bus. If it is,
check it it's still the same as it used to be, and synthesize
NameOwnerChanged signals for the name add and/or loss.
This should fully synchronize the current name list with the internal
state of all services.
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resolve: fix indentation
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Add DNSSEC proof of unsignedness and NSEC3 proof
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Fix typo on logind-dbus.c
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method_schedule_shutdown referenced org.freedesktop.login1.poweroff*
which is never registered in polkit.
Now refers to org.freedesktop.login1.power-off*
Signed-off-by: Joost Bremmer <toost.b@gmail.com>
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Let's make sure we propagate the DNSSEC validation status from an
auxiliary DNSSEC transaction back to the originating transaction, to
improve the error messages we generate.
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the the bus client
It's useful to generate useful errors, so let's do that.
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We have many types of failure for a transaction, and
DNS_TRANSACTION_FAILURE was just one specific one of them, if the server
responded with a non-zero RCODE. Hence let's rename this, to indicate
which kind of failure this actually refers to.
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In most of the other call, we called similar functions that remove the
data structure link-ups to other objects "unlink", hence we should here,
too.
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Given that we already have dns_cache_remove_by_rr() this makes clearer
what the operation actually does.
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This is not used anywhere, but it's extremely useful when debugging.
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This adds a new DnsAnswer item flag "DNS_ANSWER_SHARED_OWNER" which is
set for mDNS RRs that lack the cache-flush bit. The cache-flush bit is
removed from the DnsResourceRecord object in favour of this.
This also splits out the code that removes previous entries when adding
new positive ones into a new separate call dns_cache_remove_previous().
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After all we want to allow NULL DnsAnswer objects as equivalent to empty
ones, hence we should use the right checks everywhere.
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Make sure the cache never altes the authenticated bit of RRs stored in
it, and drops it for RRs when passing it out again.
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OPT RRs after all use the class field for other purposes than actually
encoding a class, hence the cache flush bit doesn't apply really.
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Let's use dns_cache_remove() rather than
dns_cache_item_remove_and_free() to destroy the cache, since the former
requires far fewer hash table lookups.
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When we receieve a TTL=0 RR, then let's only flush that specific RR and
not the whole RRset.
On mDNS with RRsets that a shared-owner this is how specific RRs are
removed from the set, hence support this. And on non-mDNS the whole
RRset will already be removed much earlier in dns_cache_put() hence
there's no reason remove it again.
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We should never use the TTL of an unauthenticated SOA to cache an
authenticated RR.
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We call it anyway as one of the first calls in dns_cache_put(), hence
there's no reason to do this multiple times.
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Let's keep entries for longer and more of them. After all, due to the
DNSSEC hookup the amount of RRs we need to store is much higher now.
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Let's make DNS class helpers more like DNS type helpers, let's move them
from resolved-dns-rr.[ch] into dns-type.[ch].
This also adds two new calls dns_class_is_pseudo() and
dns_class_is_valid_rr() which operate similar to dns_type_is_pseudo()
and dns_type_is_valid_rr() but for classes instead of types.
This should hopefully make handling of DNS classes and DNS types more
alike.
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OK to be unsigned
This large patch adds a couple of mechanisms to ensure we get NSEC3 and
proof-of-unsigned support into place. Specifically:
- Each item in an DnsAnswer gets two bit flags now:
DNS_ANSWER_AUTHENTICATED and DNS_ANSWER_CACHEABLE. The former is
necessary since DNS responses might contain signed as well as unsigned
RRsets in one, and we need to remember which ones are signed and which
ones aren't. The latter is necessary, since not we need to keep track
which RRsets may be cached and which ones may not be, even while
manipulating DnsAnswer objects.
- The .n_answer_cachable of DnsTransaction is dropped now (it used to
store how many of the first DnsAnswer entries are cachable), and
replaced by the DNS_ANSWER_CACHABLE flag instead.
- NSEC3 proofs are implemented now (lacking support for the wildcard
part, to be added in a later commit).
- Support for the "AD" bit has been dropped. It's unsafe, and now that
we have end-to-end authentication we don't need it anymore.
- An auxiliary DnsTransaction of a DnsTransactions is now kept around as
least as long as the latter stays around. We no longer remove the
auxiliary DnsTransaction as soon as it completed. THis is necessary,
as we now are interested not only in the RRsets it acquired but also
in its authentication status.
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Let's be safe and explicitly avoid that we add an auxiliary transaction
dependency on ourselves.
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The DNS_ANSWER_FOREACH macros do this internally anyway, no need to
duplicate this.
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We need no separate timeout anymore as soon as we received a reply, as
the auxiliary transactions have their own timeouts.
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they are destroyed
A failing transaction might cause other transactions to fail too, and
thus the set of transactions to notify for a transaction might change
while we are notifying them. Protect against that.
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We end up needing the stringified transaction key in many log messages,
hence let's simplify the logic and cache it inside of the transaction:
generate it the first time we need it, and reuse it afterwards. Free it
when the transaction goes away.
This also updated a couple of log messages to make use of this.
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Resolve: misc cleanups
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Manager status
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man: fix typo in journal-remote.conf(5)
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