Add isc_task_setquantum() function that modifies quantum for the future
isc_task_run() invocations.
NOTE: The current isc_task_run() caches the task->quantum into a local
variable and therefore the current event loop is not affected by any
quantum change.
(cherry picked from commit 15ea6f002f)
Instead of searching for the events to purge, keep the list of scheduled
events on the timer list and purge the events that we have scheduled.
(cherry picked from commit 3f8024b4a2f12fcd28a9dd813b6f1f3f11d506f2)
The isc_task_purgerange() was walking through all events on the task to
find a matching task. Instead use the ISC_LINK_LINKED to find whether
the event is active.
(cherry picked from commit 17aed2f895)
Detaching the views in the zone_shutdown() could lead to
lock-order-inversion between adb->namelocks[bucket], adb->lock,
view->lock and zone->lock. Detach the views outside of the section that
zone-locked.
(cherry picked from commit 978a0ef84c)
BIND 9.16 needs Python and PLY packages for configure to succeed.
Unless we want to tweak the build script to exclude python, we need to
add python3-ply package to the CodeQL configuration.
(cherry picked from commit 0622d11366)
Instead of going through another layer, use OpenSSL SHA1 API directly
in the isc_iterated_hash() implementation.
(cherry picked from commit 25db8d0103)
When we change the view in the view->managed_keys, we never commit the
change, keeping the previous view possibly attached forever.
Call the dns_zone_setviewcommit() immediately after changing the view as
we are detaching the previous view anyway and there's no way to recover
from that.
(cherry picked from commit 7e8b53720d)
The .view (and possibly .prev_view) would be kept attached to the
removed zone until the zone is fully removed from the memory in
zone_free(). If this process is delayed because server is busy
something else like doing constant `rndc reconfig`, it could take
seconds to detach the view, possibly keeping multiple dead views in the
memory. This could quickly lead to a massive memory bloat.
Release the views early in the zone_shutdown() call, and don't wait
until the zone is freed.
(cherry picked from commit 13bb821280)
The condition was accidentally reversed during refactoring in
9730ac4c56 . It would result in skipped
tests on builds with proper support and false negatives on builds
without proper feature support.
Credit for reporting the issue and the fix goes to Stanislav Levin.
(cherry picked from commit 473cb530f4)
Include isc_rwlocktype_t type definition in zt.h
See merge request isc-projects/bind9!7376
(cherry picked from commit d7bcdf8bd6)
395d6fca Include isc_rwlocktype_t type definition in zt.h
The hash table implementation in the current branch does not
support automatic resize operation, so the initial value of
the table should be chosen carefully.
Catalog zones entries hash table's size is currently only 4 bits,
which is very low for a catalog zone with thousands of entries,
and causes CPU consumption spikes when working with the hash
table to add/delete/search entries.
Use 16 bits instead, which should make working with big catalog
zones much faster at the expense of slightly higher memory usage,
i.e. 512 KiB for a 64-bit system for each catalog zone.
As shown in the previous commit, using sizeof(type_t) is a little
bit more error-prone when copy-pasting code, so extracting the
size information from the pointer which is being dealt with seems
like a better alternative.
(cherry picked from commit cf4003fa58)
Free 'sizeof(dns_forwarder_t)' bytes of memory instead of
'sizeof(dns_sockaddr_t)' bytes, because `fwd` is a pointer
to a 'dns_forwarder_t' type structure.
(cherry picked from commit 0cc1b06d98)
The dns_zonemgr_releasezone() function makes a decision to destroy
'zmgr' (based on its references count, after decreasing it) inside
a lock, and then destroys the object outside of the lock.
This causes a race with dns_zonemgr_detach(), which could destroy
the object in the meantime.
Change dns_zonemgr_releasezone() to detach from 'zmgr' and destroy
the object (if needed) using dns_zonemgr_detach(), outside of the
lock.
(cherry picked from commit c1fc212253)
This commit deprecates the "dscp" configuration option and "dscp"
parameters to source-address configuration options (query-source,
transfer-source, etc.
(Note that the DSCP feature has not been fully operational since
the network manager was introduced in 9.16.0; outgoing DSCP values
can be configured, but incoming DSCP values are not detected.)
Arthimetic on NULL pointers is undefined. Avoid arithmetic operations
when 'in' is NULL and require 'in' to be non-NULL if 'inlen' is not zero.
(cherry picked from commit 349c23dbb7)
When node is NULL when calling getparent() et al. they return NULL
but performing arithmetic on the NULL pointer is undefined. Check
if 'node' or 'header' is NULL and skip the adjustment.
Commit 9ffb4a7ba1 causes Clang Static
Analyzer to flag a potential NULL dereference in query_nxdomain():
query.c:9394:26: warning: Dereference of null pointer [core.NullDereference]
if (!qctx->nxrewrite || qctx->rpz_st->m.rpz->addsoa) {
^~~~~~~~~~~~~~~~~~~
1 warning generated.
The warning above is for qctx->rpz_st potentially being a NULL pointer
when query_nxdomain() is called from query_resume(). This is a false
positive because none of the database lookup result codes currently
causing query_nxdomain() to be called (DNS_R_EMPTYWILD, DNS_R_NXDOMAIN)
can be returned by a database lookup following a recursive resolution
attempt. Add a NULL check nevertheless in order to future-proof the
code and silence Clang Static Analyzer.
(cherry picked from commit 07592d1315)
(cherry picked from commit a4547a1093)
With 'stale-answer-enable yes;' and 'stale-answer-client-timeout off;',
consider the following situation:
A CNAME record and its target record are in the cache, then the CNAME
record expires, but the target record is still valid.
When a new query for the CNAME record arrives, and the query fails,
the stale record is used, and then the query "restarts" to follow
the CNAME target. The problem is that the query's multiple stale
options (like DNS_DBFIND_STALEOK) are not reset, so 'query_lookup()'
treats the restarted query as a lookup following a failed lookup,
and returns a SERVFAIL answer when there is no stale data found in the
cache, even if there is valid non-stale data there available.
With this change, query_lookup() now considers non-stale data in the
cache in the first place, and returns it if it is available.
(cherry picked from commit 91a1a8efc5)
Prime the cache with the following records:
shortttl.cname.example. 1 IN CNAME longttl.target.example.
longttl.target.example. 600 IN A 10.53.0.2
Wait for the CNAME record to expire, disable the authoritative server,
and query 'shortttl.cname.example' again, expecting a stale answer.
(cherry picked from commit 537187bf2f)
Ondřej Surý
Tom Krizek
Michał Kępień
Aram Sargsyan
Evan Hunt
Matthijs MekkingandEvan Hunt
Michal Nowak
Mark Andrews
Tony Finch
