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Michal Nowak
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doc/notes/notes-9.21.2.rst
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doc/notes/notes-9.21.2.rst
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.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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..
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.. SPDX-License-Identifier: MPL-2.0
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..
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.. This Source Code Form is subject to the terms of the Mozilla Public
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.. License, v. 2.0. If a copy of the MPL was not distributed with this
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.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
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..
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.. See the COPYRIGHT file distributed with this work for additional
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.. information regarding copyright ownership.
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(-dev)
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------
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New Features
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~~~~~~~~~~~~
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- Log query response status to the query log.
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Log a query response summary using the new category `responses`.
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Logging can be controlled by the option `responselog` and `rndc
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responselog`. :gl:`#459`
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- Added WALLET type.
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Add the new record type WALLET (262). This provides a mapping from a
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domain name to a cryptographic currency wallet. Multiple mappings can
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exist if multiple records exist. :gl:`#4947`
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- Support ISO timestamps with timezone information.
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The configuration option `print-time` can now be set to
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`iso8601-tzinfo` in order to use the ISO 8601 timestamp with timezone
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information when logging. This is used as a default for `named -g`.
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:gl:`#4963`
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- Add flag to named-checkconf to ignore "not configured" errors.
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`named-checkconf` now takes "-n" to ignore "not configured" errors.
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This allows named-checkconf to check the syntax of configurations from
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other builds which have support for more options.
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- Implement the ForwardOnlyFail statistics channel counter.
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The new ForwardOnlyFail statistics channel counter indicates the
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number of queries failed due to bad forwarders for 'forward only'
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zones.
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Related to #1793
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Removed Features
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~~~~~~~~~~~~~~~~
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- Remove "port" from source address options.
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Remove the use of "port" when configuring query-source(-v6), transfer-
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source(-v6), notify-source(-v6), parental-source(-v6), etc. Remove the
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use of source ports for parental-agents.
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Also remove the deprecated options use-{v4,v6}-udp-ports and
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avoid-{v4,v6}udp-ports. :gl:`#3843`
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- Remove DNSRPS implementation from the open-source version.
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DNSRPS was the API for a commercial implementation of Response-Policy
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Zones that was supposedly better. However, it was never open-sourced
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and has only ever been available from a single vendor. This goes
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against the principle that the open-source edition of BIND 9 should
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contain only features that are generally available and universal.
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This commit removes the DNSRPS implementation from BIND 9. It may be
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reinstated in the subscription edition if there's enough interest from
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customers, but it would have to be rewritten as a plugin (hook)
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instead of hard-wiring it again in so many places.
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Feature Changes
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~~~~~~~~~~~~~~~
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- Set logging category for notify/xfer-in related messages.
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Some 'notify' and 'xfer-in' related log messages were logged at the
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'general' category instead of their own category. This has been fixed.
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:gl:`#2730`
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- Allow IXFR-to-AXFR fallback on DNS_R_TOOMANYRECORDS.
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This change allows fallback from an IXFR failure to AXFR when the
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reason is `DNS_R_TOOMANYRECORDS`. This is because this error condition
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could be temporary only in an intermediate version of IXFR
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transactions and it's possible that the latest version of the zone
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doesn't have that condition. In such a case, the secondary would never
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be able to update the zone (even if it could) without this fallback.
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This fallback behavior is particularly useful with the recently
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introduced `max-records-per-type` and `max-types-per-name` options:
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the primary may not have these limitations and may temporarily
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introduce "too many" records, breaking IXFR. If the primary side
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subsequently deletes these records, this fallback will help recover
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the zone transfer failure automatically; without it, the secondary
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side would first need to increase the limit, which requires more
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operational overhead and has its own adverse effect. :gl:`#4928`
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- Honour the Control Group memory contraints on Linux.
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On Linux, the system administrator can use Control Group ``cgroup``
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mechanism to limit the amount of available memory to the process.
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This limit will be honoured when calculating the percentage-based
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values.
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Bug Fixes
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~~~~~~~~~
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- Fix a statistics channel counter bug when 'forward only' zones are
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used.
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When resolving a zone with a 'forward only' policy, and finding out
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that all the forwarders are marked as "bad", the 'ServerQuota' counter
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of the statistics channel was incorrectly increased. This has been
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fixed. :gl:`#1793`
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- Fix a bug in the static-stub implementation.
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Static-stub addresses and addresses from other sources were being
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mixed together, resulting in static-stub queries going to addresses
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not specified in the configuration, or alternatively, static-stub
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addresses being used instead of the correct server addresses.
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:gl:`#4850`
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- Don't allow statistics-channel if libxml2 and libjson-c are
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unsupported.
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When the libxml2 and libjson-c libraries are not supported, the
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statistics channel can't return anything useful, so it is now
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disabled. Use of `statistics-channel` in `named.conf` is a fatal
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error. :gl:`#4895`
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- Separate DNSSEC validation from the long-running tasks.
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As part of the KeyTrap \[CVE-2023-50387\] mitigation, the DNSSEC CPU-
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intensive operations were offloaded to a separate threadpool that we
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use to run other tasks that could affect the networking latency.
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If that threadpool is running some long-running tasks like RPZ,
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catalog zone processing, or zone file operations, it would delay
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DNSSEC validations to a point where the resolving signed DNS records
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would fail.
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Split the CPU-intensive and long-running tasks into separate
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threadpools in a way that the long-running tasks don't block the CPU-
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intensive operations. :gl:`#4898`
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- Fix assertion failure when processing access control lists.
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The named process could terminate unexpectedly when processing ACL.
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This has been fixed. :gl:`#4908`
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- Fix bug in Offline KSK that is using ZSK with unlimited lifetime.
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If the ZSK has unlimited lifetime, the timing metadata "Inactive" and
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"Delete" cannot be found and is treated as an error, preventing the
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zone to be signed. This has been fixed. :gl:`#4914`
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- Limit the outgoing UDP send queue size.
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If the operating system UDP queue gets full and the outgoing UDP
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sending starts to be delayed, BIND 9 could exhibit memory spikes as it
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tries to enqueue all the outgoing UDP messages. Try a bit harder to
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deliver the outgoing UDP messages synchronously and if that fails,
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drop the outgoing DNS message that would get queued up and then
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timeout on the client side. :gl:`#4930`
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- Do not set SO_INCOMING_CPU.
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We currently set SO_INCOMING_CPU incorrectly, and testing by Ondrej
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shows that fixing the issue by setting affinities is worse than
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letting the kernel schedule threads without constraints. So we should
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not set SO_INCOMING_CPU anymore. :gl:`#4936`
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- Fix the 'rndc dumpdb' command's error reporting.
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The 'rndc dumpdb' command wasn't reporting errors which occurred when
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starting up the database dump process by named, like, for example, a
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permission denied error for the 'dump-file' file. This has been fixed.
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Note, however, that 'rndc dumpdb' performs asynchronous writes, so
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errors can also occur during the dumping process, which will not be
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reported back to 'rndc', but which will still be logged by named.
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:gl:`#4944`
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- Fix long-running incoming transfers.
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Incoming transfers that took longer than 30 seconds would stop reading
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from the TCP stream and the incoming transfer would be indefinitely
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stuck causing BIND 9 to hang during shutdown.
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This has been fixed and the `max-transfer-time-in` and `max-transfer-
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idle-in` timeouts are now honoured. :gl:`#4949`
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- Fix assertion failure when receiving DNS responses over TCP.
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When matching the received Query ID in the TCP connection, an invalid
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received Query ID can very rarely cause assertion failure. :gl:`#4952`
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