We increase recursclients when we attach to recursion quota,
decrease when we detach. In some cases, when we hit soft
quota, we might attach to quota without increasing recursclients
gauge. We then decrease the gauge when we detach from quota,
and it causes the statistics to underflow.
Fix makes sure that we increase recursclients always when we
succesfully attach to recursion quota.
Compiling with -O3 triggers the following warnings with GCC 9.1:
task.c: In function ‘isc_taskmgr_create’:
task.c:1384:43: warning: ‘%04u’ directive output may be truncated writing between 4 and 10 bytes into a region of size 6 [-Wformat-truncation=]
1384 | snprintf(name, sizeof(name), "isc-worker%04u", i);
| ^~~~
task.c:1384:32: note: directive argument in the range [0, 4294967294]
1384 | snprintf(name, sizeof(name), "isc-worker%04u", i);
| ^~~~~~~~~~~~~~~~
task.c:1384:3: note: ‘snprintf’ output between 15 and 21 bytes into a destination of size 16
1384 | snprintf(name, sizeof(name), "isc-worker%04u", i);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private_test.c: In function ‘private_nsec3_totext_test’:
private_test.c:110:9: warning: array subscript 4 is outside array bounds of ‘uint32_t[1]’ {aka ‘unsigned int[1]’} [-Warray-bounds]
110 | while (*sp == '\0' && slen > 0) {
| ^~~
private_test.c:103:11: note: while referencing ‘salt’
103 | uint32_t salt;
| ^~~~
Prevent these warnings from being triggered by increasing the size of
the relevant array (task.c) and reordering conditions (private_test.c).
write locking.
Unreachable cache in zonemgr is realized as an static LRU list.
When we 'use' an entry we need to update the last-used time, we
can use atomics to do so without the necessity to upgrading
read-lock to write-lock.
- change references to trusted-keys to dnssec-keys with static-key
- rebuild doc/misc/options and other generated grammar doc
- add a "see MANAGED-KEYS" note when building named.conf.docbook
- managed-keys is now deprecated as well as trusted-keys, though
it continues to work as a synonym for dnssec-keys
- references to managed-keys have been updated throughout the code.
- tests have been updated to use dnssec-keys format
- also the trusted-keys entries have been removed from the generated
bind.keys.h file and are no longer generated by bindkeys.pl.
- any use of trusted or static keys for the root zone will now
elicit a warning, regardless of what the keys may be
- ditto for any use of a key for dlv.isc.org, static or managed
- trusted-keys is now flagged as deprecated, but still works
- managed-keys can be used to configure permanent trust anchors by
using the "static-key" keyword in place of "initial-key"
- parser now uses an enum for static-key and initial-key keywords
Since 2008, the cleaning-interval timer has been documented as
"effectively obsolete" and disabled in the default configuration with
a comment saying "now meaningless".
This change deletes all the code that implements the cleaning-interval
timer, except for the config parser in whcih it is now explicitly
marked as obsolete.
I have verified (using the deletelru and deletettl cache stats) that
named still cleans the cache after this change.
Move the macOS section of <isc/endian.h> to a lower spot as it is
believed not to be the most popular platform for running BIND. Add a
comment and remove redundant definitions.
Instead of only supporting Linux, try making <isc/endian.h> support
other GNU platforms as well. Since some compilers define __GNUC__ on
BSDs (e.g. Clang on FreeBSD), move the relevant section to the bottom of
the platform-specific part of <isc/endian.h>, so that it only gets
evaluated when more specific platform determination criteria are not
met. Also include <byteswap.h> so that any byte-swapping macros which
may be defined in that file on older platforms are used in the fallback
definitions of the nonstandard hto[bl]e{16,32,64}() and
[bl]e{16,32,64}toh() conversion functions.
While Solaris does not support the nonstandard hto[bl]e{16,32,64}() and
[bl]e{16,32,64}toh() conversion functions, it does have some
byte-swapping macros available in <sys/byteorder.h>. Ensure these
macros are used in the fallback definitions of the aforementioned
nonstandard functions.
Since the hto[bl]e{16,32,64}() and [bl]e{16,32,64}toh() conversion
functions are nonstandard, add fallback definitions of these functions
to <isc/endian.h>, so that their unavailability does not prevent
compilation from succeeding.
Current versions of DragonFly BSD, FreeBSD, NetBSD, and OpenBSD all
support the modern variants of functions converting values between host
and big-endian/little-endian byte order while older ones might not.
Ensure <isc/endian.h> works properly in both cases.
There's a small possibility of race between udp dispatcher and
socket code - socket code can still hold internal reference to a
socket while dispatcher calls isc_socket_open, which can cause
an assertion failure. Fix it by relaxing the assertion test, and
instead simply locking the socket in isc_socket_open.
qname minimization, even in relaxed mode, can fail on
some very broken domains. In relaxed mode, instead of
asking for "foo.bar NS" ask for "_.foo.bar A" to either
get a delegation or NXDOMAIN. It will require more queries
than regular mode for proper NXDOMAINs.
On some systems (namely Debian buster armhf) the readdir() call fails
with `Value too large for defined data type` unless the
_FILE_OFFSET_BITS=64 is defined. The correct way to fix this is to
get the appropriate compilation parameters from getconf system
interface.
Each network thread holds an array of locks, indexed by a hash
of fd. When we accept a connection we hold a lock in accepting thread.
We then generate the thread number and lock bucket for the new
connection socket - if we hit the same thread and lock bucket as
accepting socket we get a deadlock. Avoid this by checking if we're
in the same thread/lock bucket and not locking in this case.
This work cleans up the API which includes couple of things:
1. Make the isc_appctx_t type fully opaque
2. Protect all access to the isc_app_t members via stdatomics
3. sigwait() is part of POSIX.1, remove dead non-sigwait code
4. Remove unused code: isc_appctx_set{taskmgr,sockmgr,timermgr}
Witold KręcickiandMark Andrews
Michał Kępień
Ondřej SurýandWitold Kręcicki
Evan Hunt
Tony FinchandMark Andrews