Move the U8TO{32,64}_LE and U{32,64}TO8_LE macros to endian.h and extend
the macros for 16-bit and Big-Endian variants.
Use the macros both in isc_siphash (LE) and isc_buffer (BE) units.
The isc_buffer_reserve() would be passed a reference to the buffer
pointer, which was unnecessary as the pointer would never be changed
in the current implementation. Remove the extra dereference.
The dispatches are not thread-bound, and used freely between various
threads (see the dns_resolver and dns_request units for details).
This refactoring make sure that all non-const dns_dispatch_t and
dns_dispentry_t members are accessed under a lock, and both object now
track their internal state (NONE, CONNECTING, CONNECTED, CANCELED)
instead of guessing the state from the state of various struct members.
During the refactoring, the artificial limit DNS_DISPATCH_SOCKSQUOTA on
UDP sockets per dispatch was removed as the limiting needs to happen and
happens on in dns_resolver and limiting the number of UDP sockets
artificially in dispatch could lead to unpredictable behaviour in case
one dispatch has the limit exhausted by others are idle.
The TCP artificial limit of DNS_DISPATCH_MAXREQUESTS makes even less
sense as the TCP connections are only reused in the dns_request API
that's not a heavy user of the outgoing connections.
As a side note, the fact that UDP and TCP dispatch pretends to be same
thing, but in fact the connected UDP is handled from dns_dispentry_t and
dns_dispatch_t acts as a broker, but connected TCP is handled from
dns_dispatch_t and dns_dispatchmgr_t acts as a broker doesn't really
help the clarity of this unit.
This refactoring kept to API almost same - only dns_dispatch_cancel()
and dns_dispatch_done() were merged into dns_dispatch_done() as we need
to cancel active netmgr handles in any case to not leave dangling
connections around. The functions handling UDP and TCP have been mostly
split to their matching counterparts and the dns_dispatch_<function>
functions are now thing wrappers that call <udp|tcp>_dispatch_<function>
based on the socket type.
More debugging-level logging was added to the unit to accomodate for
this fact.
When get_attached_entry() encounters entry that would be expired, it
needs to get reference to the entry before calling maybe_expire_entry(),
so the ADB entry doesn't get destroyed inside the its own lock.
This creeped into the code base again during review, so I am adding
an extra comment to prevent this.
A full backport must have all the commit from the original MR and the
original commit IDs must be referenced in the backport commit messages.
If the criteria above is not met, the MR should be marked as a partial
backport. In that case, any discrepencies are only logged as informative
messages rather than failures.
When checking a backport MR, ensure that the original MR has been merged
already. This is vital for followup checks that verify commit IDs from
original commits are present in backport commit messages.
When doing archeology, it is much easier to find stuff if it's properly
linked. This check ensures that backport MR are linked to their original
MR via a "Backport of !XXXX" message.
The regular expression is fairly broad and has been tested to accept the
following variants of the message:
Backport of MR !XXXX
Backport of: !XXXX
backport of mr !XXXX
Backport of !XXXX
Backport of https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/XXXX
Having the MR title clearly marked in its title can be very useful when
looking through older issues/MRs.
This check also ensures that the version from the version label matches
the proper version branch (i.e. v9.16 must be marked with [v9_16]).
The overmem cleaning in ADB could become overzealous and clean fresh ADB
names and entries. Add a safety check to not clean any ADB names and
entries that are below ADB_CACHE_MINIMUM threshold.
The ADB overmem accounting would include the memory used by hashtables
thus vastly reducing the space that can be used for ADB names and
entries when the hashtables would grow. Create own memory context for
the ADB names and entries hash tables.
There was a datarace that could expire a freshly created ADB names and
entries between the return from get_attached_{name,entry} and locking it
again. Lock the ADB name and ADB entry inside the hash table lock, so
they won't get expired until the full initialization has been complete.
The dns_catz_update_from_db() function prints serial number as a signed
number (with "%d" in the format string), but the `vers` variable's type
is 'uint32_t'. This breaks serials bigger than 2^31.
Use PRIu32 instead of "d" in the format string.
The dns_adb_getcookie() doesn't use the 'adb' parameter, remove it.
Refactor the dns_adb_getcookie() function to just return the size of
the cookie when the caller passes 'NULL' as the 'cookie' argument.
Add internal logging functions isc__netmgr_log, isc__nmsocket_log(), and
isc__nmhandle_log() that can be used to add logging messages to the
netmgr, and change all direct use of isc_log_write() to use those
logging functions to properly prefix them with netmgr, nmsocket and
nmsocket+nmhandle.
When the resolver was refactored, the statistics system test had to be
adjusted in c6b4d82557. Unfortunately,
this change had to be done because of an error in the resolver
refactoring where timeout would not retry next server, but keep trying
the same server. As we have now fixed this bug, revert the change to
the test back to the previous state.
In case, we are trying to hash the empty key into the hashmap, the key
is going to have zero length. This might happen in the unit test.
Allow this and add a unit test to ensure the empty zero-length key
doesn't hash to slot 0 as SipHash 2-4 (our hash function of choice) has
no problem with zero-length inputs.
This commit fixes TLS session resumption via session IDs when
client certificates are used. To do so it makes sure that session ID
contexts are set within server TLS contexts. See OpenSSL documentation
for 'SSL_CTX_set_session_id_context()', the "Warnings" section.
A rdataset could have been left unassociated on the error path in the
resume_dslookup() in the dns_resolver unit. Clone the rdataset after
the error check, so it's not cloned before we check whether we can make
further progress chasing DS records.
