Unbound 1.13.1

This release contains a number of bug fixes.  There is added support
for the EDNS Padding option (RFC7830 and RFC8467), and the EDNS NSID
option (RFC 5001).  Unbound control has added commands to enable and
disable rpz processing.  Reply callbacks have a start time passed to
them that can be used to calculate time, these are callbacks for
response processing.  With the option serve-original-ttl the TTL served
in responses is the original, not counted down, value, for when in
front of authority service.

Features
- Merge PR NLnetLabs#375 by fhriley: Add rpz_enable and rpz_disable commands
  to unbound-control.
- Merge PR NLnetLabs#391 from fhriley: Add start_time to reply callbacks so
  modules can compute the response time.
- Fix NLnetLabs#397: [Feature request] add new type always_null to local-zone
  similar to always_nxdomain.
- Support for RFC5001: DNS Name Server Identifier (NSID) Option
  with the nsid: option in unbound.conf
- Padding of queries and responses with DNS over TLS as specified in
  RFC7830 and RFC8467.
- Merge PR NLnetLabs#275 from Roland van Rijswijk-Deij: Add feature to return the
  original instead of a decrementing TTL ('serve-original-ttl')

Bug Fixes
- Fix NLnetLabs#358: Squelch udp connect 'no route to host' errors on low
  verbosity.
- Fix NLnetLabs#360: for the additionally reported TCP Fast Open makes TCP
  connections fail, in that case we print a hint that this is
  happening with the error in the logs.
- Fix NLnetLabs#356: deadlock when listening tcp.
- Fix unbound-dnstap-socket to not use log routine from interrupt
  handler and not print so frequently when invoked in sequence.
- Fix on windows to ignore connection failure on UDP, unless verbose.
- make depend.
- Fix NLnetLabs#371: unbound-control timeout when Unbound is not running.
- Fix to squelch permission denied and other errors from remote host,
  they are logged at higher verbosity but not on low verbosity.
- Merge PR NLnetLabs#335 from fobser: Sprinkle in some static to prevent
  missing prototype warnings.
- Merge PR NLnetLabs#373 from fobser: Warning: arithmetic on a pointer to void
  is a GNU extension.
- Fix missing prototypes in the code.
- Fix error cases when udp-connect is set and send() returns an error
  (modified patch from Xin Li @delphij).
- For NLnetLabs#376: Fix that comm point event is not double removed or double
  added to event map.
- iana portlist updated.
- Fix NLnetLabs#385: autoconf 2.70 impacts unbound build
- Fix NLnetLabs#379: zone loading over HTTP appears to have buffer issues.
- Merge PR NLnetLabs#395 from mptre: add missing null check.
- Fix NLnetLabs#387: client-subnet-always-forward seems to effectively bypass
  any caching?
- For NLnetLabs#391: use struct timeval* start_time for callback information.
- For NLnetLabs#391: fix indentation.
- For NLnetLabs#391: more double casts in python start time calculation.
- Add comment documentation.
- Fix clang analysis warning.
- Fix so local zone types always_nodata and always_deny can be used
  from the config file.
- Merge NLnetLabs#399 from xiangbao227: The lock of lruhash table should
  unlocked after markdel entry.
- Fix for NLnetLabs#93: dynlibmodule link fix for Windows.
- Fix for NLnetLabs#93: dynlibmodule import library is named libunbound.dll.a.
- Merge NLnetLabs#402 from fobser: Implement IPv4-Embedded addresses according
  to RFC6052.
- Fix NLnetLabs#404: DNS query with small edns bufsize fail.
- Fix declaration before statement and signed comparison warning in
  dns64.
- Fix TTL of SOA record for negative answers (localzone and
  authzone data) to be the minimum of the SOA TTL and the SOA.MINIMUM.
- Fix compile of unbound-dnstap-socket without dnstap installed.
- Merge PR NLnetLabs#355 from noloader: Make ICANN Update CA and DS Trust Anchor
  static data.
- Ignore cache blacklisting when trying to reply with expired data from
  cache (NLnetLabs#394).
- Merge PR NLnetLabs#408 from fobser: Prevent a few more yacc clashes.
- Annotate that we ignore the return value of if_indextoname.
- Fix to use correct type for label count in rpz routine.
- Fix empty clause warning in config_file nsid parse.
- Fix to use correct type for label count in ipdnametoaddr rpz routine.
- Fix empty clause warning in edns pass for padding.
- Fix for doxygen 1.8.20 compatibility.
- Attempt to fix NULL keys in the reuse_tcp tree; relates to NLnetLabs#411.
- Fix dynlibmod link on rhel8 for -ldl inclusion.
- Fix windows dependency on libssp.dll because of default stack
  protector in mingw.
- Fix indentation of root anchor for use by windows install script.

Unbound 1.13.1rc2 tag

Unbound 1.13.1rc1 tag

Unbound 1.13.0

This version has fixes to connect for UDP sockets, slowing down potential
ICMP side channel leakage.  The fix can be controlled with the option
udp-connect: yes, it is enabled by default.

Additionally CVE-2020-28935 is fixed, this solves a problem where the
pidfile is altered by a symlink, and fails if a symlink is encountered.
See https://nlnetlabs.nl/downloads/unbound/CVE-2020-28935.txt for more
information.

New features are upstream TCP and TLS query reuse, where a channel is
reused for several queries.  And http-notls-downstream: yesno for
unencrypted DoH, useful for back end support servers.  The option
infra-keep-probing can be used to probe hosts that are down more
frequently.

The options edns-client-string and edns-client-string-opcode can be used
to add an EDNS option with the specified string in queries towards servers,
with the servers specified by IP address.  It replaces the edns-client-tag
option.

Features
- Pass the comm_reply information to the inplace_cb_reply* functions
  during the mesh state and update the documentation on that.
- Fix NLnetLabs#330: [Feature request] Add unencrypted DNS over HTTPS support.
  This adds the option http-notls-downstream: yesno to change that,
  and the dohclient test code has the -n option.
- Merge PR NLnetLabs#228 : infra-keep-probing option to probe hosts that are
  down.  Add infra-keep-probing: yes option. Hosts that are down are
  probed more frequently.
  With the option turned on, it probes about every 120 seconds,
  eventually after exponential backoff, and that keeps that way. If
  traffic keeps up for the domain. It probes with one at a time, eg.
  one query is allowed to probe, other queries within that 120 second
  interval are turned away.
- Merge PR NLnetLabs#313 from Ralph Dolmans: Replace edns-client-tag with
  edns-client-string option.
- Merge PR NLnetLabs#283 : Stream reuse.  This implements upstream stream
  reuse for performing several queries over the same TCP or TLS
  channel.
- Fix to connect() to UDP destinations, default turned on,
  this lowers vulnerability to ICMP side channels.
  Option to toggle udp-connect, default is enabled.

Bug Fixes
- Fix NLnetLabs#319: potential memory leak on config failure, in rpz config.
- Fix dnstap socket and the chroot not applied properly to the dnstap
  socket path.
- Fix warning in libnss compile, nss_buf2dsa is not used without DSA.
- Fix NLnetLabs#323: unbound testsuite fails on mock build in systemd-nspawn
  if systemd support is build.
- Fix for python reply callback to see mesh state reply_list member,
  it only removes it briefly for the commpoint call so that it does
  not drop it and attempt to modify the reply list during reply.
- Fix that if there are on reply callbacks, those are called per
  reply and a new message created if that was modified by the call.
- Free up auth zone parse region after use for lookup of host
- Merge PR NLnetLabs#326 from netblue30: DoH: implement content-length
  header field.
- DoH content length, simplify code, remove declaration after
  statement and fix cast warning.
- Fix that if there are reply callbacks for the given rcode, those
  are called per reply and a new message created if that was modified
  by the call.
- Fix that the out of order TCP processing does not limit the
  number of outstanding queries over a connection.
- Fix python documentation warning on functions.rst inplace_cb_reply.
- Log ip address when http session recv fails, eg. due to tls fail.
- Fix to set the tcp handler event toggle flag back to default when
  the handler structure is reused.
- Clean the fix for out of order TCP processing limits on number
  of queries.  It was tested to work.
- Fix that http settings have colon in set_option, for
  http-endpoint, http-max-streams, http-query-buffer-size,
  http-response-buffer-size, and http-nodelay.
- Fix memory leak of https port string when reading config.
- local-zone regional allocations outside of chunk
- Merge PR NLnetLabs#324 from James Renken: Add modern X.509v3 extensions to
  unbound-control TLS certificates.
- Fix for PR NLnetLabs#324 to attach the x509v3 extensions to the client
  certificate.
- Fix NLnetLabs#327: net/if.h check fails on some darwin versions; contribution by
  Joshua Root.
- Fix NLnetLabs#320: potential memory corruption due to size miscomputation upton
  custom region alloc init.
- Fix NLnetLabs#333: Unbound Segmentation Fault w/ log_info Functions From
  Python Mod.
- Fix that minimal-responses does not remove addresses from a priming
  query response.
- In man page note that tls-cert-bundle is read before permission
  drop and chroot.
- Fix NLnetLabs#341: fixing a possible memory leak.
- Fix memory leak after fix for possible memory leak failure.
- Fix NLnetLabs#343: Fail to build --with-libnghttp2 with error: 'SSIZE_MAX'
  undeclared.
- Fix for NLnetLabs#303 CVE-2020-28935 : Fix that symlink does not interfere
  with chown of pidfile.
- Fix NLnetLabs#347: IP_DONTFRAG broken on Apple xcode 12.2.
- Fix NLnetLabs#350: with the AF_NETLINK permission, to fix 1.12.0 error:
  failed to list interfaces: getifaddrs: Address family not
  supported by protocol.
- Merge NLnetLabs#351 from dvzrv: Add AF_NETLINK to set of allowed socket
  address families.
- iana portlist updated.
- Fix crash when TLS connection is closed prematurely, when
  reuse tree comparison is not properly identical to insertion.
- Fix padding of struct regional for 32bit systems.
- with udp-connect ignore connection refused with UDP timeouts.
- Fix udp-connect on FreeBSD, do send calls on connected UDP socket.
- Better fix for reuse tree comparison for is-tls sockets.  Where
  the tree key identity is preserved after cleanup of the TLS state.
- Fix memory leak for edns client tag opcode config element.
- Attempt fix for libevent state in tcp reuse cases after a packet
  is written.
- Fix readagain and writeagain callback functions for comm point
  cleanup.
- Fix to omit UDP receive errors from log, if verbosity low.
  These happen because of udp-connect.
- For NLnetLabs#352: contrib/metrics.awk for Prometheus style metrics output.
- Fix that after failed read, the readagain cannot activate.
- Clear readagain upon decommission of pending tcp structure.
- Fix compile warning for type cast in http2_submit_dns_response.
- Fix when use free buffer to initialize rbtree for stream reuse.
- Fix compile warnings for windows.
- Fix compile warnings in rpz initialization.
- Fix contrib/metrics.awk for FreeBSD awk compatibility.
- Fix assertion failure on double callback when iterator loses
  interest in query at head of line that then has the tcp stream
  not kept for reuse.
- Fix stream reuse and tcp fast open.

Unbound 1.13.0rc4 tag.

Unbound 1.13.0rc3 tag

Unbound 1.13.0rc2 tag

Tag for Unbound 1.13.0rc1

Unbound 1.12.0

This release contains the DNS Flag Day 2020 changes.  This sets the default EDNS buffer size to 1232, that should reduce fragmentation.
https://dnsflagday.net/2020/

There is inclusive language in the configuration.  There is caps-exempt, ipsecmod-allow and primary server options for auth-zones.  The older terms are accepted to keep configuration working.

DNS-over-HTTPS is supported in this release.  The DoH is enabled when Unbound is compiled with the nghttp2 library, with configure --with-libnghttp2.  Then have an interface on the https port, that can be configured with the https-port option.  Also have a cert and key available with the tls-service-key and tls-service-pem options.  Further settings can be configured for the http-endpoint, http-max-streams, http-query-buffer-size, http-response-buffer-size and http-nodelay options.  The max streams sets the maximum concurrent streams, the buffer size options the number of bytes in buffers, and the nodelay option can turn on TCP_NODELAY for DNS-over-HTTPS service.  In the statistics the memory used is reported in mem.http.query_buffer and mem.http.response_buffer.  The number of queries is reported in num.query.https, they are also included in the tcp and tls counts because https uses TLS and TCP.

The DLV options and code to handle DLV lookups have been removed from the code base.  The DLV repository is empty nowadays, it has been decommissioned.

There is a new feature where it is possible to use interface names to bind to the IP addresses on that interface.  It pulls in the addresses at the start of the server, if the addresses change, use the existing freebind and other socket options to register for addresses before they appear, or the interface-automatic option that copies them from queries to answers with ancillary data.

There is a new option for the edns-tag draft specification.  It can be enabled if you need the tentative implementation to add those tags to outgoing messages.

Features
- DNS Flag Day 2020: change edns-buffer-size default to 1232.
- Merge PR NLnetLabs#255: DNS-over-HTTPS support.
- Use inclusive language in configuration
- Merge PR NLnetLabs#284 and Fix NLnetLabs#246: Remove DLV entirely from Unbound.
  The DLV has been decommisioned and in unbound 1.5.4, in 2015, there
  was advise to stop using it.  The current code base does not contain
  DLV code any more.  The use of dlv options displays a warning.
- Similar to NSD PR#113, implement that interface names can be used,
  eg. something like interface: eth0 is resolved at server start and
  uses the IP addresses for that named interface.
- Merge PR NLnetLabs#272: Add EDNS client tag functionality.
- Add edns-client-tag-opcode option

Bug Fixes
- Merge PR NLnetLabs#270 from cgzones: munin plugin: always exit 0 in autoconf
- Merge PR NLnetLabs#269, Fix python module len() implementations, by Torbjörn
  Lönnemark
- Merge PR NLnetLabs#268, draft-ietf-dnsop-serve-stale-10 has become RFC 8767 on
  March 2020, by and0x000.
- Fix doxygen comment for no ssl for tls session ticket key callback
  routine.
- Fix mini_event.h on OpenBSD cannot find fd_set.
- Improve error log message when inserting rpz RR.
- Merge PR NLnetLabs#280, Make tvOS & watchOS checks verify truthiness as well as
  definedness, by Felipe Gasper.
- contrib/aaaa-filter-iterator.patch file renewed diff content to
  apply cleanly to the current coderepo for the current code version.
- Fix NLnetLabs#287: doc typo: "Additionaly".
- Merge (modified) PR NLnetLabs#277, use EVP_MAC_CTX_set_params if available,
  by Vítězslav Čížek.
- Create and init edns tags data for libunbound.
- Fix stats double count issue (NLnetLabs#289).
- Fix that dnstap reconnects do not spam the log with the repeated
  attempts.  Attempts on the timer are only logged on high verbosity,
  if they produce a connection failure error.
- Fix to apply chroot to dnstap-socket-path, if chroot is enabled.
- Change configure to use EVP_sha256 instead of HMAC_Update for
  openssl-3.0.0.
- Update documentation in python example code.
- Review fix interface, doxygen and assign null in case of error free.
- Merge PR NLnetLabs#293: Add missing prototype.  Also refactor to use the new
  shorthand function to clean up the code.
- Refactor to use sock_strerr shorthand function.
- Fix NLnetLabs#296: systemd nss-lookup.target is reached before unbound can
  successfully answer queries. Changed contrib/unbound.service.in.
- Fix num.expired statistics output.
- Remove x file mode on ipset/ipset.c and h files.
- Spelling fix.
- Introduce test for statistics.
- Fix that prefer-ip4 and prefer-ip6 can be get and set with
  unbound-control, with libunbound and the unbound-checkconf option
  output function.
- Merge PR NLnetLabs#311 by luismerino: Dynlibmod leak.
- Error message is logged for dynlibmod malloc failures.
- iana portlist updated.
- Fix NLnetLabs#304: dnstap logging not recovering after dnstap process restarts
- Fix edns-client-tags get_option typo
- Fix NLnetLabs#305: dnstap logging significantly affects unbound performance
  (regression in 1.11).
- Fix NLnetLabs#305: only wake up thread when threshold reached.
- Fix to ifdef fptr wlist item for dnstap.
- Fix memory leak of edns tags at libunbound context delete.
- Fix double loopexit for unbound-dnstap-socket after sigterm.

Unbound 1.12.0rc1