Unbound 1.24.0rc1 pre-release

[Wouter Wijngaards]

Hi,

Unbound 1.24.0rc1 pre-release is available:
https://nlnetlabs.nl/downloads/unbound/unbound-1.24.0rc1.tar.gz
sha256 27baedd2e5c764cb9b949810b8974a2c0ae88ee0040ed49eb5adb7573d8e0b96
pgp https://nlnetlabs.nl/downloads/unbound/unbound-1.24.0rc1.tar.gz.asc

This release features increased defaults, num.valops statistic,
unbound-control cache_lookup, and bug fixes.

The default value increase for num-queries-per-thread is to make
saturation of the task queue more resource intensive and less
practical. Thanks to Shiming Liu, Network and Information Security
Lab, Tsinghua University for the report.

The default value increase for so-sndbuf is to mitigate a cross-layer
issue where the UDP socket send buffers are exhausted waiting for
ARP/NDP resolution. Thanks to Reflyable for the report.

Various cache -slabs options are auto-configured if not specified
in the config file. It uses a power of two close to the number of
threads. When the option is specified in the config file that value
is used instead.

An extra statistic is added to track the number of signature validation
operations by the validator, `num.valops`.

The unbound-control `cache_lookup` command prints cache information for
names in the domain given. This prints similar to dump_cache, but only
names under the zone(s) specified. Because of that it locks the caches
for a much shorter time, and this is good for server responsiveness.

The `sock-queue-timeout` option is adapted to work on FreeBSD as well
as Linux.

Features
- Increase default to `num-queries-per-thread: 2048`, when unbound is
   compiled with libevent. It makes saturation of the task queue more
   resource intensive and less practical. Thanks to Shiming Liu,
   Network and Information Security Lab, Tsinghua University for the
   report.
- Merge #1276: Auto-configure '-slabs' values.
- Change default for so-sndbuf to 1m, to mitigate a cross-layer
   issue where the UDP socket send buffers are exhausted waiting
   for ARP/NDP resolution. Thanks to Reflyable for the report.
- Adjusted so-sndbuf default to 4m.
- Merge #1289 from Roland van Rijswijk-Deij: Add extra statistic to
   track the number of signature validation operations.
   Adds 'num.valops' to extended statistics.
- Fix #1303: [FR] Disable TLSv1.2.
- unbound-control cache_lookup <domains> prints the cached rrsets
   and messages for those.
- unbound-control cache_lookup +t allows tld and root names. And
   subnet cache contents are printed.
- Fix #1319: [FR] zone status for Unbound auth-zones.

Bug Fixes
- Fix #1272: assertion failure testcode/unitverify.c:202.
- Merge #1275: Use macros for the fr_check_changed* functions.
- Fix for parallel build of dnstap protoc-c output.
- Fix dnstap to use protoc.
- Sync unbound and unbound-checkconf log output for unknown modules.
- Fix #1281: forward-zone "name: ." conflicts with auth-zone "name: ."
   in 1.23.0, but worked in 1.22.0.
- Fix #1283: Unsafe usage of atoi() while parsing the configuration
   file.
- Merge #1280: Fix auth nsec3 code. Fixes NSEC3 code to not break on
   broken auth zones that include unsigned out of zone (above apex)
   data. Could lead to hang while trying to prove a wildcard answer.
- Fix #1284: NULL pointer deref in az_find_nsec_cover() (latent bug)
   by adding a log_assert() to safeguard future development.
- Fix #1282: log-destaddr fail on long ipv6 addresses.
- Fix config of slab values when there is no config file.
- Fix for cname chain length with qtype ANY and qname minimisation.
   Thanks to Jim Greenwood from Nominet for the report.
- Merge #1285:  RST man pages. It introduces restructuredText man pages
   to sync the online and source code man page documentation.
   The templated man pages (*.in) are still part of the repo but
   generated with docutils from their .rst counterpart.
   Documentation on how to generate those (mainly for core developers)
   is in README.man.
- Add more checks about respip in unbound-checkconf.
   Also fixes #310: unbound-checkconf not reporting RPZ configuration
   error.
- Fix #1288: [FR] Improve fuzzing of unbound by adapting the netbound
   program.
- Small manpage corrections for the 'disable-dnssec-lame-check' option.
- Fix unbound-anchor certificate file read for line ends and end of
   file.
- Fix comment for the dname_remove_label_limit_len function.
- iana portlist updated.
- Fix bitwise operators in conditional expressions with parentheses.
- Fix conditional expressions with parentheses for bitwise and.
- Fix header return value description for skip_pkt_rrs and
   parse_edns_from_query_pkt.
- Fix to check control-interface addresses in unbound-checkconf.
- Fix #1295: Windows 32-bit binaries download seems to be missing dll
   dependency.
- Fix for consistent use of local zone CNAME alias for configured auth
   zones. Now it also applies to downstream configured auth zones.
- Fix #1296: DNS over QUIC depends on a very outdated version of
   ngtcp2. Fixed so it works with ngtcp2 1.13.0 and OpenSSL 3.5.0.
- Merge #1297: edns-subnet: fix NULL_AFTER_DEREF on subnetmod.
- Fix rrset cache create allocation failure case.
- Fix #1293: EDE 6 is attached to insecure cached answers when client
   sends the CD bit.
- Fix #1247: forward-first: ssl handshake failed on root nameservers.
- For #1247, turn off fetch-policy for delegation when looking into
   parent side name servers that may not update the addresses and hit
   NXNS limits.
- For #1247, replay test (added tcp_transport to
   outnet_serviced_query).
- Merge #1299: Fix typos.
- Generate ltmain.sh and configure again.
- Fix #1300: Is 'sock-queue-timeout' a linux only feature.
- For #1300: implement sock-queue-timeout for FreeBSD as well.
- Fix layout of comm_point_udp_ancil_callback.
- Fix to improve dnstap discovery on Fedora.
- Fix detection of SSL_CTX_set_tmp_ecdh function.
- For #1301: configure cant find SSL_is_quic in OpenSSL 3.5.1.
- For #1289: test num.valops in existing stat_values.tdir.
- For #1289: add num.valops in the unbound-control man page.
- Add unit tests for non-ecs aggregation.
- Fix to not set rlimits in the unit tests.
- iana portlist updated.
- Redis checks for server down and throttles reconnects.
- Fix redis cachedb module gettimeofday init failure.
- Fix testbound test program to accurately output packets from hex.
- Fix #1309: incorrectly reclaimed tcp handler can cause data
   corruption and segfault.
- Fix to use assertions for consistency checks in #1309 reclaimed
   tcp handlers.
- Fix edns subnet, so that the subquery without subnet is stored in
   global cache if the querier used 0.0.0.0/0 and the name and address
   do not receive subnet treatment. If the name and address are
   configured for subnet, it is stored in the subnet cache.
- Fix dname_str for printout of long names. Thanks to Jan Komissar
   for the fix.
- Fix that edns-subnet failure to create a subquery errors as
   servfail, and not formerror.
- Fix to whitespace in dname_str.
- Fix that unbound-control dump_cache releases the cache locks
   every so often, so that the server stays responsive.
- Fix to remove debug from cache_lookup.
- Fix to unlock cache_lookup message for malformed records.
- Fix to increase responsiveness of dump_cache.
- Fix to decouple file descriptor activity and cache lookups in
   dump_cache.
- Fix cache_lookup subnet printout to wipe zero part of the prefix.
- Fix cache_lookup subnet print to not print messages without rrsets
   and perform in-depth check on node in the addrtree.
- Fix to check for extraneous command arguments for unbound-control,
   when the command takes no arguments but there are arguments present.
- Fix #1317: Unbound starts too early. Add
   Wants=network-online.target under [Unit] in unbound.service.
- Fix for #1317: Fix contrib/unbound.service comment path for
   systemd network configuration.
- For #1318: Fix compile warnings for DoH compile on windows.
- Fix sha1 enable environment variable in test code on windows.
- Fix that the zone acquired timestamp is set after the
   zonefile is read.
- Fix ports workflow to install expat for macos.
- Fix unbound-control dump_cache for double unlock of lruhash table.
- Fix setup_listen_sslctx warning for nettle compile.
- Limit the number of consecutive reads on an HTTP/2 session.
   Thanks to Gal Bar Nahum for exposing the possibility of infinite
   reads on the session.
- Fix for #1324: Fix to free edns options scratch in ratelimit case.
- Fix #1235: Outdated Python2 code in
   unbound/pythonmod/examples/log.py.
- Fix #1324: Memory leak in 'msgparse.c' in
   'parse_edns_options_from_query(...)'.
- Fix indentation in tcp-mss option parsing.
- For #1328: make depend.
- Update documentation for using "SET ... EX" in Redis.
- Document max buffer sizes for Redis commands.
- Update man pages.
- Fix #1332: CNAME chains are sometimes not followed when RPZs add a
   local CNAME rewrite.

Best regards, Wouter