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      6 .. License, v. 2.0.  If a copy of the MPL was not distributed with this
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      9 .. See the COPYRIGHT file distributed with this work for additional
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     11 
     12 BIND 9.20.10
     13 ------------
     14 
     15 New Features
     16 ~~~~~~~~~~~~
     17 
     18 - Implement a new 'notify-defer' configuration option. ``a24db6433e6``
     19 
     20   This new option sets a delay (in seconds) to wait before sending a set
     21   of NOTIFY messages for a zone. Whenever a NOTIFY message is ready to
     22   be sent, sending will be deferred for this duration. This option is
     23   not to be confused with the :any:`notify-delay` option. The default is
     24   0 seconds. :gl:`#5259` :gl:`!10465`
     25 
     26 Removed Features
     27 ~~~~~~~~~~~~~~~~
     28 
     29 - Implement the systemd notification protocol manually to remove
     30   dependency on libsystemd. ``4f7e806a12b``
     31 
     32   libsystemd, despite being useful, adds a huge surface area for just
     33   using the sd_notify API. libsystemd's surface has been exploited in
     34   the past [1].
     35 
     36   Implement the systemd notification protocol by hand since it is just
     37   sending newline-delimited datagrams to a UNIX socket. The code
     38   shouldn't need more attention in the future since the notification
     39   protocol is covered under systemd's stability promise [2].
     40 
     41   We don't need to support VSOCK-backed service notifications since they
     42   are only intended for virtual machine inits.
     43 
     44   [1]: https://www.openwall.com/lists/oss-security/2024/03/29/4 [2]:
     45   https://systemd.io/PORTABILITY_AND_STABILITY/ :gl:`!10454`
     46 
     47 Bug Fixes
     48 ~~~~~~~~~
     49 
     50 - Fix zone deletion issue. ``66fc4ee86e0``
     51 
     52   A secondary zone could initiate a new zone transfer from the primary
     53   server after it had been already deleted from the secondary server,
     54   and before the internal garbage collection was activated to clean it
     55   up completely. This has been fixed. :gl:`#5291` :gl:`!10496`
     56 
     57 - Fix a zone refresh bug. ``f09bb8b88c6``
     58 
     59   A secondary zone could fail to further refresh with new versions of
     60   the zone from a primary server if named was reconfigured during the
     61   SOA request step of an ongoing zone transfer. This has been fixed.
     62   :gl:`#5307` :gl:`!10495`
     63 
     64 - Allow keystore.c to compile on Solaris. ``108adab25a0``
     65 
     66   keystore.c failed to compile on Solaris because NAME_MAX was
     67   undefined.  Include 'isc/dir.h' which defines NAME_MAX for platforms
     68   that don't define it. :gl:`#5327` :gl:`!10523`
     69 
     70 - Set name for all the isc_mem contexts. ``bdcd698edf7``
     71 
     72   :gl:`!10498`
     73 
     74 
     75