Unbound 1.4.6

Features

• Builtin root hints contain AAAA for I.ROOT-SERVERS.NET.
• unbound.h has extern "C" statement for easier include in c++.
• added feature to print configure date, target and options with -h.
• added feature to print event backend system details with -h.
• (ports and works on Minix 3.1.7). On Minix, add /usr/gnu/bin to PATH, use ./configure AR=/usr/gnu/bin/gar and gmake.
• GOST enabled if SSL is recent and ldns has GOST enabled too.

Bug Fixes

• Fix TCPreply on systems with no writev, if just 1 byte could be sent.
• Fix to use one pointer less for iterator query state store_parent_NS.
• Max referral count from 30 to 130, because 128 one character domains is valid DNS.
• added documentation for the histogram printout to syslog.
• Fix assertion failure reported by Kai Storbeck from XS4ALL, the assertion was wrong.
• updated ldns tarball.
• iana portlist updated.
• Unbound reports libev or libevent correctly in logs in verbose mode.
• Fix handling of corner case reply from lame server, follows rfc2308. It could lead to a nodata reply getting into the cache if the search for a non-lame server turned up other misconfigured servers.
• Fix jostle list bug found by Vince (luoce at cnnic), it caused the qps in overload situations to be about 5 qps for the class of shortly serviced queries. The capacity of the resolver is then about (numqueriesperthread / 2) / (average time for such long queries) qps for long queries. And about (numqueriesperthread / 2)/(jostletimeout in whole seconds) qps for short queries, per thread.
• Fix the max number of reply-address count to be applied for duplicate queries, and not for new query list entries. This raises the memory usage to a max of (16+1)*numqueriesperthread reply addresses.
• Fix RFC4035 compliance with 2.2 statement that the DNSKEY at apex must be signed with all algorithms from the DS rrset at the parent. This is now checked and becomes bogus if not.
• Fix validation of qtype DNSKEY when a key-cache entry exists but no rr-cache entry is used (it expired or prefetch), it then goes back up to the DS or trust-anchor to validate the DNSKEY.
• log if a server is skipped because it is on the donotquery list, at verbosity 4, to enable diagnosis why no queries to 127.0.0.1.
• failure to chown the pidfile is not fatal any more.
• Neat function prototypes, unshadowed local declarations.
• Fix integer underflow in prefetch ttl creation from cache. This fixes a potential negative prefetch ttl.
• Changed the defaults for num-queries-per-thread/outgoing-range. For builtin-select: 512/960, for libevent 1024/4096 and for windows 24/48 (because of win api). This makes the ratio this way to improve resilience under heavy load. For high performance, use libevent and possibly higher numbers.

Unbound 1.4.5

Features

• unbound-control get_option domain-insecure shows config file items.
• Autotrust anchor file can be initialized with a ZSK key as well (if the domain's DNSKEY set is signed with that ZSK).
• Conforms to draft-ietf-dnsop-default-local-zones-13. Added default reverse lookup blocks for IPv4 test nets 100.51.198.in-addr.arpa, 113.0.203.in-addr.arpa and Orchid prefix 0.1.1.0.0.2.ip6.arpa.
• Contribution from Migiel de Vos (Surfnet): nagios patch for unbound-host, in contrib/ (in the source tarball). Makes unbound-host suitable for monitoring dnssec(-chain) status.
• GOST disabled-by-default, the algorithm number is allocated but the RFC is still has to pass AUTH48 at the IETF.

Bug Fixes

• Fix validation failure for qtype ANY caused by a RRSIG parse failure. The validator error message was 'no signatures from ...'.
• Squelch log message: sendto failed permission denied for 255.255.255.255, it is visible in VERB_DETAIL (verbosity 2).
• Fix fetch from blacklisted dnssec lame servers as last resort. The server's IP address is then given in validator errors as well.
• Fix local-zone type redirect that did not use the query name for the answer rrset.
• Compile fix using Sun Studio 12 compiler on Solaris 5.9, use CPPFLAGS during configure process.
• Fix if libev is installed on the base system (not libevent), detect it from the event.h header file and link with -lev.
• Fix configlexer.lex gets config.h, and configyyrename.h added by make, no more double include.
• More strict scrubber (Thanks to George Barwood for the idea): NS set must be pertinent to the query.
• [bugzilla: 307 ]
  In 0x20 backoff fix fallback so the number of outstanding queries does not become -1 and block the request. Fixed handling of recursion-lame in combination with 0x20 fallback. Fix so RRsets are compared canonicalized and sorted if the immediate comparison fails, this makes the 0x20 option work around round-robin sites.
• Fix retry sequence if prime hints are recursion-lame.
• Fix so harden-referral-path does not result in failures due to max-depth. You can increase the max-depth by adding numbers (' 0') after the target-fetch-policy, this increases the depth to which is checked.
• Fix detection of GOST support in ldns (reported by Chris Smith).
• Fix for dnssec lameness detection to use the key cache.
• infra cache entries that are expired are wiped clean. Previously it was possible to not expire host data (if accessed often).
• Fix dnssec-missing detection that was turned off by server selection.
• [bugzilla: 308 ]
  Fix spelling error in variable name in parser and lexer.
• Fix various compiler warnings from the clang llvm compiler.
• Fix comments in iter_utils:dp_is_useless.
• EDNS timeout code will not fire if EDNS status already known.
• EDNS failure not stored if EDNS status known to work.
• Parent-child disagreement approach altered. Older fixes are removed in place of a more exhaustive search for misconfigured data available via the parent of a delegation. This is designed to be throttled by cache entries, with TTL from the parent if possible. Additionally the loop-counter is used. It also tests for NS RRset differences between parent and child. The fetch of misconfigured data should be more reliable and thorough. It should work reliably even with no or only partial data in cache. Data received from the child (as always) is deemed more authoritative than information received from the delegation parent. The search for misconfigured data is not performed normally.
• Fix AD flag handling, it could in some cases mistakenly copy the AD flag from upstream servers.
• Ignore Z flag in incoming messages too.
• alloc_special_obtain out of memory is not a fatal error any more, enabling unbound to continue longer in out of memory conditions.
• Parentside names are dispreferred but not said to be dnssec-lame.
• Fix parentside and querytargets modulestate, for dump_requestlist.
• unbound-control-setup makes keys -rw-r--- so not all users permitted.
• libtoolize 2.2.6b, autoconf 2.65 applied to configure.
• Fix compile warning if compiled without threads.
• iana portlist updated.
• included ldns tarball updated.
• Fix bug where a long loop could be entered, now cycle detection has a loop-counter and maximum search amount.

Unbound 1.4.4

Features

• Experimental ECC-GOST algorithm support, needs openssl-1.0.0 and currently needs ldns from svn trunk. Uses ECC-GOST algorithm number 12 (assigned by IANA). As the RFC is written, we intend to make it optional, because a dependency on openssl-1.0.0 is hard across distributions right now.
• unbound-host disables use-syslog from config file so that the config file for the main server can be used more easily.
• Include less in config.h and include per code file for ldns, ssl.

Bug Fixes

• [bugzilla: 305 ]
  pkt_dname_tolower could read beyond end of buffer or get into an endless loop, if 0x20 was enabled, and buffers are small or particular broken packets are received.
• Fix chain of trust with CNAME at an intermediate step, for the DS processing proof.
• Fix validation of queries with wildcard names (*.example).
• Fix EDNS probe for .de DNSSEC testbed failure, where the infra cache timeout coincided with a server update, the current EDNS backoff is less sensitive, and does not cache the backoff unless the backoff actually works and the domain is not expecting DNSSEC.
• unbound control flushed items are not counted when flushed again.
• iana portlist updated.
• [bugzilla: 301 ]
  unbound-checkconf could not parse interface '0.0.0.0@5353', even though unbound itself worked fine.
• Fixed random numbers for port, interface and server selection. Removed very small bias.
• Refer to the listing in unbound-control man page in the extended statistics entry in the unbound.conf man page.
• Fix interface-automatic for OpenBSD: msg.controllen was too small, also assertions on ancillary data buffer.
• check for IP_SENDSRCADDR for interface-automatic or IP_PKTINFO.
• for NSEC3 check if signatures are cached.
• Reordered configure checks so fork and -lnsl -lsocket checks are earlier, and thus later checks benefit from and do not hinder them.
• ldns tarball updated.
• Fix python use when multithreaded.
• Fix solaris python compile.
• spelling fix in validation error involving cnames.

Unbound 1.4.3

Bug Fixes

• Fix for memory alignment in struct sock_list allocation. This is a remote denial of service vulnerability, as it could make unbound crash on 64bit systems if triggered.
• Fix for MacPorts ldns without ssl default, unbound checks if ldns has dnssec functionality and uses the builtin if not.
• Fix daemonize on Solaris 10, it did not detach from terminal.

Unbound 1.4.2

Features

• unbound-control list_stubs, list_forwards, list_local_zones, list_local_data, log_reopen, set_option and get_option.
• libunbound ub_ctx_get_option() added.
• --enable-checking: enables assertions but does not look nonproduction.
• nicer VERB_DETAIL (verbosity 2, unbound-host -d) output, with nxdomain and nodata distinguished.
• prefetch-key option that performs DNSKEY queries earlier in the validation process, and that could halve the latency on DNSSEC queries. It takes some extra processing (CPU, a cache is needed).
• prefetch option that prefetches popular queries before they expire.
• change unbound-control-setup from 1024(sha1) to 1536(sha256).

Bug Fixes

• Re-query pattern changed on validation failure. To protect troubled authority servers, unbound caches a failure for the DNSKEY or DS records for the entire zone, and only retries that 900 seconds later. This implies that only a handful of packets are sent extra to the authority if the zone fails. We made the choice to send out more conservatively, protecting against an aggregate effect more than protecting a single user (from their own folly, perhaps in case of misconfig).
• Fix crash in control channel code.
• iana portlist updated.
• make install depends on make all.
• Fix 5011 auto-trust-anchor-file initial read to skip RRSIGs.
• ldns tarball updated: long label length syntax error fix, libdl compile fix.
• --disable-rpath fixed for libtool not found errors.
• Fixup prototype for lexer cleanup in daemon code.
• Fix scrubber bug that potentially let NS records through. Reported by Amanda Constant.
• Also delete potential poison references from additional.
• Fix: no classification of a forwarder as lame, throwaway instead.
• More strict DS scrubbing.
• No more blacklisting of unresponsive servers, a 2 minute timeout is backed off to.
• RD flag not enabled for dnssec-blacklisted tries, unless necessary.
• log 'tcp connect: connection timed out' only in high verbosity.
• Disregard DNSKEY from authority section for chain of trust. DS records that are irrelevant to a referral scrubbed. Anti-poison.
• Check for 'no space left on device' (or other errors) when writing updated autotrust anchors and print errno to log.
• Fixup in compat snprintf routine, %f 1.02 and %g support.
• include math.h for testbound test compile portability.
• Updated url of IANA itar, interim trust anchor repository, in script.
• configure test for memcmp portability.
• removed warning on format string in validator error log statement.
• libtool finish the install of unbound python dynamic library.
• Fixup lookup trouble for parent-child domains on the first query.
• Fixup ldns detection to also check for header files.
• Fix unbound-checkconf for auto-trust-anchor-file present checks.
• Fix for parent-child disagreement code which could have trouble when (a) ipv6 was disabled and (b) the TTL for parent and child were different. There were two bugs, the parent-side information is fixed to no longer block lookup of child side information and the iterator is fixed to no longer attempt to get ipv6 when it is not enabled and then give up in failure.
• Fixup python documentation (thanks Leo Vandewoestijne).
• [bugzilla: 291 ]
  DNS wireformat max is 255. dname_valid allowed 256 length.
• verbose output includes parent-side-address notion for lameness.
• documented val-log-level: 2 setting in example.conf and man page.

Unbound 1.4.1

Features

• Bind the same interface multiple times at different ports. Use multiple interface: lines with an @port suffix.

Bug Fixes

• Fix libtool version to 2 because of why_bogus change in 1.4.0.
• [bugzilla: 284 ]
  fix parse of # without end-of-line at end-of-file.
• Fix crash with module-config "iterator".
• [bugzilla: 287 ]
  Fix segfault when unbound-control remove nonexistent local data. And an update of ldns tarball with fix for parse errors generated for domain names like '.example.com'.
• Fix for lookup of parent-child disagreement domains, where the parent-side glue works but it does not provide proper NS, A or AAAA for itself, fixing motorcaravanners.eu.
• Fix negative cache lookup of closestencloser check of DS type bit.
• Fix SOA excluded from negative DS responses. Reported by Hauke Lampe.
• Fix that verify_rrsig routine checks expiration last.
• on IPv4 UDP turn off DF flag.
• Fix qclass=ANY queries, with class IN contents.

Unbound 1.4.0

Features

• RFC 5702: RSASHA256 and RSASHA512 support enabled by default. Please use openssl 0.9.8 or later, that provide sha256 and sha512.
• included ldns tarball updated (which also enables rsasha256 support).
• val-log-level: 2 shows extended error information for validation failures, one line per failure. For example: validation failure <example.com. DNSKEY IN>: signature expired from 192.0.2.4 for trust anchor example.com. while building chain of trust
• Made new validator error string available from libunbound for applications. It is in result->why_bogus, a zero-terminated string. unbound-host prints it by default if a result is bogus. Also the errinf is public in module_qstate (for other modules).
• retry on DNSSEC failures, query other servers, unbound works harder to get valid DNSSEC data.
• so-rcvbuf: 4m option added. Set this on large busy servers to not drop the occasional packet in spikes due to full socket buffers. netstat -su keeps a counter of UDP dropped due to full buffers.
• auto-trust-anchor-file option with RFC5011 support, code from the NLnet Labs autotrust project(BSD license), is incorporated. In this way unbound can support trust anchor revocation properly, even revocation back to the unsigned state. It can read normal anchor files or autotrust files initially, after probing the file is written to in a format specific to unbound.
• use linebuffering for log-file: output, this can be significantly faster than the previous fflush method and enable some class of resolvers to use high verbosity (for short periods). Not on windows, because line buffering does not work there.
• Patch from Zdenek Vasicek and Attila Nagy for using the source IP from python scripts. See pythonmod/examples/resip.py.
• Got a patch from Luca Bruno for libunbound support on windows to pick up the system resolvconf nameservers and hosts there.
• call OPENSSL_config() in unbound and unit test so that the operator can use openssl.cnf for configuration options.
• Experimental support (disabled by default) for GOST for unofficial algorithm number 249 of draft-dolmatov-dnsext-dnssec-gost-01, tested to work with openssl-1.0.0beta and correct for examples in -01 draft.
• edns-buffer-size option, default 4096. Can be set to 1480 in case of DNS UDP fragments not arriving from authority servers.
• iana portlist updated.
• contrib/split-itar.sh from Tom Hendrikx to split anchors.mf from the IANA ITAR into individual key files that can be tracked with auto-trust-anchor-file.

Bug Fixes

• fixed do-udp: no (only TCP is used).
• removed abort on prealloc failure, error still printed but softfail.
• Fix bug where autotrust does not work when started with a DS.
• Fix double time subtraction in negative cache reported by Amanda Constant and Hugh Mahon.
• fix unbound-host so -d can be given before -C.
• fix DNSSEC-missing-signature detection for minimal responses for qtype DNSKEY (assumes DNSKEY occurs at zone apex).
• fix compile of unbound-host when --enable-alloc-checks.
• Fix lookup problem reported by Koh-ichi Ito and Jaap Akkerhuis.
• Manual page fixes reported by Tony Finch.
• Fix memory leak reported by Tao Ma.
• increased MAXSYSLOGLEN so .bg key can be printed in debug output.
• Fix bug where DNSSEC-bogus messages were marked with too high TTL. The RRsets would still expire at the normal time, but this would keep messages bogus in the cache for too long.
• documented that load_cache is meant for debugging.
• fixup printing errors when load_cache, they were printed to the SSL connection which had just broken, now to the log.
• Changes to make unbound work with libevent-2.0.3 alpha. (in configure detection due to new ssl dependency in libevent).
• do not call sphinx for documentation when python is disabled.
• remove EV_PERSIST from libevent timeout code to make the code compatible with the libevent-2.0. Works with older libevent too.
• fix memory leak in python code.
• makefile fix for parallel makes.
• fixup unbound-control lookup to print forward and stub servers.
• fixup memleak in trust anchor unsupported algorithm check.
• free all memory on program exit, fix for ssl and flex.
• fixup DS lookup at anchor point with unsigned parent.
• fixup DLV lookup for DS queries to unsigned domains.
• Fix so that servers are only blacklisted if they fail to reply to 16 queries in a row and the timeout gets above 2 minutes.
• unbound-control lookup prints out infra cache information, like RTT.
• Fix bug in DLV lookup reported by Amanda from Secure64. It could sometimes wrongly classify a domain as unsigned, which does not give the AD bit on replies.
• Thanks to Surfnet found bug in new dnssec-retry code that failed to combine well when combined with DLV and then a validation failure.
• removed small memory leak from config file reader.
• fix manpage errors reported by debian lintian.
• Fixed validation failure for CNAME to optout NSEC3 nodata answer.
• unbound-host does not fail on type ANY.
• Fixed wireparse failure to put RRSIGs together with data in some long ANY mix cases, which fixes validation failures.
• Fixed signer detection of CNAME responses without signatures.
• [bugzilla: 282 ]
  Fixed libunbound memleak on error condition by Eric Sesterhenn.

Unbound 1.3.4

Bug Fixes

• Fixed bug in NSEC3 validation handling code: Under specific circumstances checks of signatures over NSEC3 records are not done. As a result carefully crafted delegation responses (created through exploiting general DNS vulnerabilities such as DNS packet spoofing) can be used to downgrade an existing secure delegation to insecure. Unbound users who depend on DNSSEC validation are advised to upgrade.
• iana portlist updated.

Unbound 1.3.3

Features

• feature val-log-level: 1 prints validation failures so you can keep track of them during dnssec deployment.
• contrib/update-anchor.sh has -r option for root-hints.
• crosscompile possible
• verified that --enable-sha2 works with draft rsasha256-14

Bug Fixes

• nicer warning when algorithm not supported, tells you to upgrade.
• Updated unbound-cacti contribution from Dmitriy Demidov, with the queue statistics displayed in its own graph.
• Fix bug found by Michael Tokarev where unbound would try to prime the root servers even though forwarders are configured for the root.
• Ignore transient sendto errors, no route to host, and host, net down.
• Fix server selection, so that it waits for open target queries when faced with lameness.
• iana portlist updated.
• Updated ldns tarball for solaris x64 compile assistance.
• Fixed to not use RAND_MAX on windows, so all 16 ID bits are used.

Unbound 1.3.2

Bug Fixes

• [bugzilla: 261 ]
  Fix for crash at start on Windows.

Unbound 1.3.1

Features

• unbound_munin_ in contrib uses ps to show total memory rss if sbrk hack does not work.
• Added build-unbound-localzone-from-hosts.pl to contrib, from Dennis DeDonatis. It converts /etc/hosts into config statements.

Bug Fixes

• Fixup potential wrong NSEC picked out of the cache.
• If unfulfilled callbacks are deleted they are called with an error.
• fwd above stub in configuration works.
• [bugzilla: 254 ]
  removed random whitespace from example.conf.
• Fixed bug where cached responses would lose their security status on second validation, which especially impacted dlv lookups. Reported by Hauke Lampe.
• Fixup opportunistic target query generation to it does not generate queries that are known to fail.
• harden-referral-path: handle cases where NS is in answer section.
• updated fedora specfile in contrib from Paul Wouters.
• Fix EDNS fallback when EDNS works for short answers but long answers are dropped.
• On Linux, fragment IPv6 datagrams to the IPv6 minimum MTU, to avoid dropped packets at routers.
• Fix of message parse bug where (specifically) an NSEC and RRSIG in the wrong order would be parsed, but put wrongly into internal structures so that later validation would fail.
• Queries for type DS when forward or stub zones are there. They are performed to higherup domains, and thus treated as if going to higher zones when looking up the right forward or stub server. This makes a stub pointing to a local server that has a local view of example.com signed with the same keys as are publicly used work. Reported by Johan Ihren.
• same thing fixed for forward-zone and DS, chain of trust from public internet into the forward-zone works now.
• flush_type and flush_name remove message cache entries as well, so they remove errors from the cache as well
• delegationpoint bogus flag copied fix
• [bugzilla: 251 ]
  openssl key files are opened 'apache-style', from user root and before the chroot. This makes permissions on remote-control key files easier.
• fail to configure with python if swig is not found.
• Fix of empty -L during linking
• updated ldns tarball to latest
• updated iana portlist

Unbound 1.3.0

Features

• Major features are Windows port, and Python contribution. Previous releases accidentally enabled experimental rsasha256 algorithms, fixed, see below. There are minor features and bug fixes too.
• initgroups(3) is called to drop secondary group permissions, if this OS functionality is available.
• daemon(3) posix call is used when available
• configure option --with-ldns-builtin forces the use of the inluded ldns package with the unbound source. The -I include is put before the others, so it avoids bad include files from an older ldns install.
• --enable-sha2 option for rsasha256 and rsasha512 support (experimental because it is still in working group draft stage). Default is off. Previous releases accidentally enabled this feature when lib openssl supported SHA256. It then used algorithms 8, 9 for RSASHA256 and 10, 11 for RSASHA512 (using four numbers as was according to the draft spec at that time). The earlier versions support NSEC and NSEC3 for all these algorithm numbers. People with these earlier versions may also have earlier openssl versions (0.9.7), and therefore the experimental feature is disabled. As long as these signing algorithm code points are not allocated, there is no problem. You are advised to upgrade to the current version to avoid surprises.
• new option log-time-ascii: yes if you enable it prints timestamps in the log file as Feb 06 13:45:26 (like syslog does).
• verbosity level 5 logs customer IP for new requestlist entries.
• contrib contains specfile for fedora 1.2.1 (from Paul Wouters).
• call setusercontext() if available (on BSD)
• Added stats_noreset feature for unbound-control.
• Added flush_requestlist feature for unbound-control.
• unbound-control status shows if root forwarding is in use.
• Added forward command for unbound control to change forwarders to use on the fly.
• unbound-checkconf and unbound server print warnings when trust anchors have unsupported algorithms.
• Added contrib/update-itar.sh This script is similar to update-anchor.sh, and updates from the IANA ITAR repository. You can provide your own PGP key and trust repo, or can use the builtin. The program uses wget and gpg to work.
• Support spaces and backslashes in configure default paths
• register and deregister util programs for unbound.exe into the windows service control manager. Works on XP and with Vista UAC.
• unbound can work as a service on windows, for the registry settings and default program location and so on, see the windows manual.
• installer for unbound on windows. uninstalls too. Menu entries optional. Can install DLV anchor with updater application (anchor-update.exe, works a bit like update-anchor.sh) to enable DNSSEC easily. Uses the NSIS open source installer system.
• Added contrib/unbound_cacti for statistics support in cacti, contributed by Dmitriy Demidov.
• domain-insecure: "example.com" statement added. Sets domain insecure regardless of chain of trust DSs or DLVs. The inverse of a trust-anchor.
• use _beginthreadex() when available (performs stack alignment on mingw)
• added launchd plist example file for MacOSX to contrib.
• reworked configure scripts to be neater.
• python contribution from Zdenek Vasicek and Marek Vavrusa. (Sponsored by cz.nic for 'summer of code' development). This contains support to use libunbound from python code. And support to create unbound modules written in python that perform custom processing of queries. The code is disabled by default and needs to be enabled by passing options to configure. Installs the following files: /usr/lib/python2.x/site-packages/ unboundmodule.py unbound.py and _unbound.so*. The script examples are not installed. Sphinx docs can be built with make doc (if sphinx-build is available).
• new libunbound calls to manage local data more easily
• read /dev/random before chroot
• suppress errors when trying to contact authority servers that gave ipv6 AAAA records for their nameservers with ipv4 mapped contents. Still tries to do so, higher verbosity shows the error.
• clock skew checks in unbound, config statements.
• Added cache-min-ttl option.
• [bugzilla: 226 ]
  Added dump_requestlist feature for unbound-control.
• [bugzilla: 227 ]
  Added flush_stats feature for unbound-control.
• [bugzilla: 231 ]
  Added unbound-checkconf -o option, that prints that value from config file. Useful for scripting in management scripts and the like.

Bug Fixes

• fix for threadsafety in solaris thr_key_create() in tests.
• fixes for porting the python code to BSD and Darwin
• fix for openssl-1.0.0beta, use of STRING #define, libdl linking.
• Fix reentrant in minievent handler for unix. Could have resulted in spurious event callbacks.
• [bugzilla: 245 ]
  fix munin plugin, perform cleanup of stale lockfiles.
• Fix for removal of RSASHA256_NSEC3 protonumber from ldns. Also new rsasha512 (interim) algorithm number.
• Detect FreeBSD jail without ipv6 addresses assigned.
• Fixed a bug that caused messages to be stored in the cache too long. Hard to trigger, but NXDOMAINs for nameservers or CNAME targets have been more vulnerable to the TTL miscalculation bug.
• fixed bug in unbound-control flush_zone where it would not flush every message in the target domain. This especially impacted NXDOMAIN messages which could remain in the cache regardless.
• Fixup so no non-absolute rpaths are added.
• Fixup validation of RRSIG queries, they are let through.
• fix util/configlexer.c and solaris -std=c99 flag.
• deprecation test for daemon(3) (on MacOSX).
• [bugzilla: 239 ]
  module-config entries order is important. Documented.
• Fix for and test for unknown algorithms in a trust anchor definition. Trust anchors with no supported algos are ignored. This means a (higher)DS or DLV entry for them could succeed, and otherwise they are treated as insecure.
• Added tests, unknown algorithms become insecure. fallback works.
• fixed so queries do not fail on opportunistic target queries.
• munin plugin fix benign locking error printout.
• fixup --export-symbols to be -export-symbls for libtool. This should fix extraneous symbols exported from libunbound. Thanks to Ondrej Sury and Robert Edmonds for finding it.
• document FAQ entry on stub/forward zones and default blocking.
• Remove fwrite warning on Ubuntu
• Added more cycle detection. Also for target queries.
• Fixup bug where during deletion of the mesh queries the callbacks that were reentrant caused assertion failures. Keep the mesh in a reentrant safe state. Affected libunbound, reload of server, on quit and flush_requestlist.
• documented that unbound-host reads no config file by default.
• slightly nicer memory management in iter-fwd code.
• small refactor of stats clearing.
• fixup EOL in include directive (reported by Paul Wouters).
• config parser changed. Gives some syntax errors closer to where they occurred. Does not enforce a space after keyword anymore. Does not allow literal newlines inside quoted strings anymore.
• detect event_base_new() in libevent-1.4.1 and later and use it.
• MacOSX Leopard cleaner text output from configure.
• change in libunbound API: ub_cancel can return an error, that the async_id did not exist, or that it was already delivered. The result could have been delivered just before the cancel routine managed to acquire the lock, so a caller may get the result at the same time they call cancel. For this case, ub_cancel tries to return an error code. Fixes race condition in use of ub_cancel() libunbound function.
• Fixup assertion failure (thanks to Brett Carr).
• Fix detection of no ipv6 on XP (with different error code).
• Fixup a crash-on-exit which was triggered by a very long queue.
• Fixed bug that could cause a crash if root prime failed when there were message backlogs.
• fixup documentation-bug in README reported by Matthew Dempsky.
• Fixup bad free() when wrongly encoded DSA signature is seen. Reported by Paul Wouters.
• updated ldns tarball to latest
• updated iana portlist

Unbound 1.2.1

Features

• negative caching for failed queries. Queries that failed (because the entire domain is down) are cached for a very short time (seconds), this lowers the load generated by the failed queries. If the failure is local, like out of memory, it is not cached.
• stop resolving AAAAs promiscuously when they are in the negative cache, together with the negative caching feature (just above) this dampens the spikiness of the requestlist size.
• unbound-host -4 and -6 options. Stops annoying ipv6 errors when debugging with unbound-host -4 -d ...
• honor QUIET=no on make commandline (or QUIET=yes ).

Bug Fixes

• Fixed server deadlock. Added cycle detection for NS-check, addr-check, root-prime and stub-prime queries in the iterator.
• [bugzilla: 229 ]
  fixup configure checks for compilation with Solaris sun studio cc compiler, ./configure CC=/opt/SUNWspro/bin/cc
• fixup warnings emitted by sun studio compiler.
• the TTL comparison for the cache used different comparisons, causing many cache responses that used the iterator and validator state machines unnecessarily. Fixed.
• Fixed occasional SERVFAIL response when EDNS traffic is dropped for a domain. Set retry from 4 to 5 so that EDNS drop retry is part of the first query resolve attempt, and cached error does not stop EDNS fallback.
• removed debug prints in code that protects against bad referrals.
• fix bug where unbound could crash using libevent 1.3 and older.
• more quiet about ipv6 network failures, i.e. when ipv6 is not available (network unreachable). Debug still printed on high verbosity.
• printout more detailed errors on ssl certificate loading failures.
• builtin IANA allocated portlist updated (these ports are avoided).

Unbound 1.2.0

Features

• Wildcard support for trusted-keys-file: "/etc/keys/*.key"
• unbound-control status command.
• extended statistics has a number of ipv6 queries counter. contrib/unbound_munin_ was updated to draw ipv6 in the hits graph.
• SElinux policy files in contrib/selinux for the unbound daemon, by Paul Wouters and Adam Tkac.

Bug Fixes

• The long standing bug with libevent use is fixed. It turns out to be a race condition in the calls to libevent. The builtin mini-event did not have a problem being called like this, but libevent and libev usage is now fixed. Libevent 1.1 is reported to still give problems, but 1.4.5 and 1.4.8 seem fine.
• Certain packets could cause an assertion failure. Resulting in a denial-of-service vector if the server was compiled with --enable-debug (assertions enabled). This is fixed.
• fixed bug reported by Duane Wessels: error in DLV lookup, would make some zones that had correct DLV keys as insecure.
• [bugzilla: 228 ]
  fix lame marking. security fix that resolves denial of service that could be triggered by an unusual configuration. Thanks to Mark Zealey for reporting.
• [bugzilla: 224 ]
  no more race condition in makefile during built with high -j inside included libldns version.
• iana portlist updated to most recent, avoids allocated ports.
• L root server AAAA record added to builtin root hints.
• removed possible race condition in unit test for race conditions.
• fixup reported problem with transparent local-zone data where queries with different type could get nxdomain. Now queries with a different name get resolved normally, with different type get a correct NOERROR/NODATA answer.
• HINFO no longer downcased for validation, making unbound compatible with bind and ldns.
• fix reading included config files when chrooted. Give full path names for include files. Relative path names work if the start dir equals the working dir.
• fix libunbound message transport when no packet buffer is available.
• fixup getaddrinfo failure handling for remote control port.
• fixup so it works with libev-3.51 from http://dist.schmorp.de/libev/
• ldns tarball updated with 1.4.1rc for DLV unit test.
• fixup BSD port for infra host storage. It hashed wrongly.
• follow ldns rc makedist name generation.
• snapshot version uses _ not - to help rpm distinguish the version number.
• do not reopen syslog to avoid dev/log dependency. This makes chroot environments easier.
• [bugzilla: 219 ]
  better fix for bug #219: use LOG_NDELAY with openlog() call. Thanks to Tamas Tevesz.
• [bugzilla: 221 ]
  fixed: unbound checkconf checks if key files exist if remote control is enabled. Also fixed NULL printf when not chrooted.
• Fix problem reported by Jaco Engelbrecht where unbound-control stats freezes up unbound if this was compiled without threading, and was using multiple processes.
• test for remote control with interprocess communication.
• created command distribution mechanism so that remote control commands other than 'stats' work on all processes in a nonthreaded compiled version. dump/load cache work, on the first process.
• fixup remote control local_data addition memory corruption bug.
• [bugzilla: 220 ]
  configure complains when --without-ssl is given, fixed.
• blacklisted servers are polled at a low rate (1%) to see if they come back up. But not if there is some other working server.
• documented that the user of the server daemon needs read privileges on the keys and certificates generated by unbound-control-setup. This is different per system or distribution, usually, running the script under the same username as the server uses suffices. i.e. sudo -u unbound unbound-control-setup
• unbound-control-setup.sh removes read/write permissions other from the keys it creates (as suggested by Dmitriy Demidov).
• fixed tcp accept, errors were printed when they should not.
• fixup fatal error due to faulty error checking after tcp accept.
• add check in rlimit code to avoid integer underflow.
• rlimit check with new formula; better estimate for number interfaces.

Unbound 1.1.1

Bug Fixes

• [bugzilla: 219 ]
  Fixed syslog with chroot, glibc syslog opens only on demand so a log line has to be printed before chroot.
• fixup fatal error due to faulty error checking after tcp accept.
• rlimit check on startup integer underflow fixup, also makes a more accurate estimate

Unbound 1.1.0

Features

• DLV support
• contrib update-anchor.sh neatly updates keys for DLV or root or others and only restarts the nameserver when keys have changed. exits 0 when a restart is needed, other values if not. So, update-anchor.sh -d mydir && /etc/rc.d/unbound restart can restart unbound exactly when needed. Use -b for BIND mode.
• Negative caching for NSEC, NSEC3 for DLV lookups, as well as for securely insecure delegations.
• Filter out overreaching NSEC records
• dev/log(syslog) opened before chroot
• use setresuid/setresgid, more secure.
• logfile message classification as notice, info, debug.
• harden-referral-path option implements draft-wijngaards-dnsext-resolver-side-mitigation-00, protects against many Kaminsky variations. Default is off, because of added load it generates, and experimental status.
• disallow nonrecursive queries for cache snooping by default. You can allow it using access-control: subnet allow_snoop. The defaults do allow access to authoritative data without RD bit.
• DoS resistance implementation. Half of queries run-to-completion. Other half are a lifo where old entries are overwritten if 200 msec old.
• Block DNS rebinding attacks. This disallows domains from the public internet from pretending to have internet addresses in your own netblock. Use the private-address and private-domain statements (see unbound.conf(5) man page for details). We may consider turning this on by default for rfc1918 (local subnet) addresses.
• remote control feature, unbound-control. Remotely (using SSL) stop, change redirections, flush cache, load cache, store cache, or get statistics
• extended statistics (off by default). Put Howto documentation on website.
• munin example plugin to draw statistics added to contrib
• hosts that drop EDNS packets are detected, eventually.
• fixed recursion servers deployed as authoritative detection, so that as a last resort, a +RD query is sent there to get the correct answer.
• RSASHA256 and RSASHA512 support, using experimental protocol numbers from draft.
• stubs work much more intuitively, but can be configure for old and new behaviour with new option stub-prime. This makes stubs on localhost on a different port number work.
• dns-0x20 fallback code implemented
• IPv4 and IPv6 PTR shorthand local-data-ptr: "1.2.3.4 www.ex.com"
• code refactored for domain, address tree lookups.
• unbound-control-setup.sh script to set up (selfsigned) certificates.
• spoof nearmiss indicator, when extended statistics are enabled, unbound-control stats prints out unwanted_replies count.
• if server selection is faced with only bad choices, it will attempt to get more options to be fetched.
• changed bogus-ttl default value from 900 to 60 seconds. In anticipation that operator caused failures are more likely than actual attacks at this time. And thus repeated validation helps the operators get the problem fixed sooner. It makes validation failures go away sooner (60 seconds after the zone is fixed). Also it is likely to try different nameserver targets every minute, so that if a zone is bad on one server but not another, it is likely to pick up the 'correct' one after a couple minutes, and if the TTL is big enough that solves validation for the zone.
• do not query bogus nameservers. It is as-if nameservers that have the NS or A or AAAA record bogus are listed as donotquery.
• CFLAGS are picked up by configure from the environment.
• silenced EHOSTDOWN, verbosity 2 and higher show it.
• configure check for ldns version 1.4.0 or later
• Fix for problem reported on mailing list, If a delegation point has no A but only AAAA and do-ip6 is no, resolution would fail. Fixed to ask for the A and AAAA records. It has to ask for both always, so that it can fail quietly, from TLD perspective, when a zone is only reachable on one transport.

Bug Fixes

• Fixed rrset security updated overwriting rfc2181 trust status. This makes validated to be insecure data just as worthless as nonvalidated data, and 2181 rules prevent cache overwrites to them.
• [bugzilla: 217 ]
  Fixed setreuid on MacOSX 10.4
• Fixed so make realclean works better, by Rober Edmonds
• [bugzilla: 208 ]
  extra rc.d unbound flexibility for freebsd/nanobsd.
• [bugzilla: 203 ]
  nicer do-auto log message when user sets incompatible options. DLV implemented.
• [bugzilla: 204 ]
  variable name ameliorated in log.c.
• [bugzilla: 206 ]
  in iana_update, no egrep, but awk use.
• [bugzilla: 199 ]
  fixed, pidfile can be outside chroot. openlog is done before chroot and drop permissions. logfile is created with correct permissions again. Some errors are not written to logfile (pidfile writing, forking), and these are only visible by using the -d commandline flag.
• Fix update-anchor.sh to work both in BSD shell and bash.
• Fix so unsigned additionals are not marked bogus, they are left unchecked, since signatures may have fallen off due to message size. Unchecked items are removed from the additional just like bogus is for that message. Defers validation for those rrsets.
• Fix assertion fail on bogus key handling
• Fix so dnssec lameness detection works on first query at trust apex.
• Fix compilation without pthreads on linux.
• builtin iana assigned portlist updated
• ldns snapshot inside source tarball updated to 1.4.0
• Fix NSEC_AT_APEX classification for short typemaps.
• Fix nonblocking and timeouts on TCP sockets
• Fix for multiple simultaneous timeout back offs. Could cause trouble for forwarders
• Fix SHA256 DS downgrade, no longer possible to downgrade to SHA1.
• Fix negative TTL values appearing (reported by Attila Nagy)
• detect if libssl needs libdl. For static linking with libssl.
• Fix build process for Mac OSX linker
• Fix possible memory leak in key_entry_key deletion. Would leak a couple bytes when trust anchors were replaced.
• DNAMEs used from cache have their synthesized CNAMEs initialized properly.
• Fix file descriptor leak for localzone type deny (for TCP).
• Fix memleak for the keyword 'nodefault' when reading config. Would leak bytes per reload command received.
• Fix listen to closed fd, would log a message with "bad file descriptor"

Unbound 1.0.2

Features

• Stricter filtering of messages. This means that CNAMEs and DNAMEs are handled with more paranoia, as well as the removal of more irrelevant rrsets. More discussion at patch 1.0.2 announcement.

Bug Fixes

• Fixup qtype DS validation code
• [bugzilla: 198 ]
  Fix for nicer entropy warning message, OS hints in manpage.
• [bugzilla: 201 ]
  Fix segfault on exit cleanup of the app if packets were still waiting for udp port numbers.

Unbound 1.0.1

Features

• This version features bugfixes to compile on various distributions, some options necessary to assist packaging and distribution of unbound, a couple of fixes for looking up corner cases (badly operated domains), and a cleanup of code for config file reading.
• contrib unbound.spec from Patrick Vande Walle
• mingw port with basic functionality on Windows XP and Windows Vista (single threaded, UDP, TCP, IPv4, IPv6, validation)
• Added IPv6 example prefix to AS112 default blocklist

Bug Fixes

• fixup fedora 9 compilation (in6_pktinfo definition)
• CREDITS fixup of history
• ldns-1.2.2 is ignored if installed, and builtin 1.3.0 ldns used
• lex input and unput functions not generated (compile warnings)
• update of ldns tarball to latest ldns svn.
• update of avoided ports to latest IANA allocated portlist
• fixed up statements of the form local-zone: "30.172.in-addr.arpa." nodefault, so that the trailing dot is not required.
• reported by Robert Edmonds (akamai zones), fixed so that if multiple CNAME records for a name are returned, the first is used.
• reported by Richard Doty for mail.opusnet.com, check lameness more cautiously, first check SOA record, before looking at NS record, then, additionally, check the AA bit.
• reported for newegg.com, more detailed lameness checking to distinguish AAAA lameness from qtype A lameness.
• fixup compiling on eeepc xandros linux
• fixup memory leak in root hints file reading
• fixup validation for qtype DS queries with trust anchor for the same name
• libunbound ub_resolve, fix handling of error condition during setup.
• lowered log_hex blocksize to fit through BSD syslog linesize.
• [bugzilla: 174 ]
  make test checks for ldns-testns requirement of tcp_sigpipe test
• [bugzilla: 175 ]
  call tzset before chroot to have correct timestamps in system log
• [bugzilla: 177 ]
  fixed compilation failure on opensuse, the --disable-static configure flag caused problems. Patch from Klaus Singvogel
• [bugzilla: 178 ]
  fixed unportable shell usage in configure (relied on bash)
• [bugzilla: 179 ]
  same fix as 177.
• [bugzilla: 180 ]
  fixed buffer overflow in unbound-checkconf use of strncat
• [bugzilla: 181 ]
  fixed buffer overflow in ldns (called by unbound to parse config file parts)
• [bugzilla: 183 ]
  pidfile, rundir, and chroot configure options. Also the example.conf and manual pages get the configured defaults. You can use: (or accept the defaults to /usr/local/etc/unbound/) --with-conf-file=filename --with-pidfile=filename --with-run-dir=path --with-chroot-dir=path
• [bugzilla: 184 ]
  -r option for unbound-host, read resolv.conf.
• [bugzilla: 185 ]
  --disable-shared not passed along to ldns included with unbound. Fixed so that configure parameters are passed to the subdir configure script. Fixed that ./libtool is used always, you can still override manually with ./configure libtool=mylibtool or set $libtool in the environment.

Unbound 1.0.0

Features

• This code is the public release
• Honors $DESTDIR during make install and make uninstall, useful for rpm and deb packaging.
• contrib .spec file to build RPMs with
• iana port list updated
• added IPv6 addresses for builtin root hints

Bug Fixes

• Fixup no-IPv4 problem in error callback
• No linking with -lrt if not needed
• library version now has proper version-info (Thanks Ondrej Sury)
• configure --disable-rpath performs libtool fixup
• MacOSX 10.5 /etc/hosts lines ending in %lo0 are skipped (Thanks John Dickinson)

Unbound 0.11

Features

• This code is public beta and ready for deployment.
• Default file locations changed to /usr/local/etc/unbound
• RTT banding (draft-forgery-resilience)
• query name checks (draft-forgery-resilience)
• random ports improved (draft-forgery-resilience)
• AD bit signaling (AD bit in query requests AD bit in reply)
• unbound tries to set ulimit(fds) if it needs to
• stats to rrdtool script in contrib (Thanks Kai Storbeck)
• FEATURES document

Bug Fixes

• Fixed so works with libevent-1.4.3+
• iterator logs spelling fixed (Thanks Koji Kobayashi)
• RFC2181 compliance improved (Thanks Jinmei Tatuya)
• DSA EVP signature decoding fixed
• chroot functionality better documented and checked (Thanks Randy Bush)
• ignore SIGPIPE from dns clients (Thanks Kai Storbeck)

Unbound 0.10

Features

• This code is public beta and ready for deployment.
• updated ldns-tarball inside source from trunk for latest NSEC3 type codes
• installation to /usr/local/sbin by default now, like other servers do
• libunbound returns the full answer packet (with signatures, additional data, NSECs ...)
• option 'use-caps-for-id: yesno', experimental implementation of draft-dns-0x20.
• default configure uses builtin event mechanism, since it is faster and usually good enough. Use libevent when you use huge outgoing port ranges.
• Various optimisations
• make test shows an indication of cache speed
• unbound-host patch (from Jan-Piet Mens) to read config file
• added contrib/ dir with an /etc/rc.d script for FreeBSD

Bug Fixes

• --prefix option for configure also changes directory: pidfile: and chroot: defaults in config file.
• fixed so you can start without a config file (will complain, but start with defaults).
• fixed read of empty lines in /etc/hosts by libunbound
• fix to install all manual pages (unbound-host and libunbound pages too)
• fixed memory leaks in libunbound (during cancellation and ub_wait).

Unbound 0.9

Features

• This code is beta and not recommended for operational deployment.
• Remade verbosity levels, new level 2.
• can answer multiple queries over one TCP stream.
• library libunbound offers a validating stub implementation.
• unbound-host uses library to validate and lookup like host
• statistics-interval: seconds option added.
• interface-automatic: option added. Experimental, uses socket options to guarantee correct source address on UDP replies. Useful for multihomed hosts.
• Memory sizes in config can be given with k, m, or g
• Prints approximation of the median from histogram
• unbound-checkconf checks for local-net misconfigurations

Bug Fixes

• Fixed roothints and keyfiles access from chrooted daemon.
• Random generator uses less entropy.

Unbound 0.8

Features

• Local zone data - serve authoritative data
• Access control list - ips that have recursion allowed
• by default blocks AS 112 (reverse local net) queries
• This code is pre-beta and not recommended for operational deployment.
• per rfc2308, replaced default max-ttl value with 1 day.

Bug Fixes

• Validation works now for non RD queries
• duplicate checking for NSECs and NSEC3s after CNAMEs
• do not downcase NSEC and RRSIG for verification. Follows draft-ietf-dnsext-dnssec-bis-updates-06.txt.

Unbound 0.7.2

Features

• bugfixes for closed beta test version, not recommended for widespread deployment

Bug Fixes

• Fixup building the source from another directory.
• Fixup failure on start due to lack of entropy.

Unbound 0.7.1

Features

• bugfixes for closed beta test version, not recommended for widespread deployment

Bug Fixes

• Fixes in make test to kill daemons more thoroughly after test
• NSEC/RRSIG not downcased, from dnssec-bis-updates draft-06
• libevent not found error nicer
• README discusses GNU make needs

Unbound 0.7

Features

• closed beta test version, not recommended for widespread deployment
• support branch for closed beta participants

Unbound 0.6

Features

• Operational features.
• Secured by default (chroot).
• Memory leaks gone, lameness detection, corner cases and various fixes
• config file checker unbound-checkconf
• root hints file supported
• ldns library tarball included in source package for ease of installation
• This code is pre-beta and not recommended for operational deployment.

Unbound 0.5

Features

• Validation.
• Fixes to recursive iterator code.
• This code is pre-beta and not recommended for operational deployment.

Unbound 0.4

Features

• Caching resolver.
• This code is pre-beta and not recommended for operational deployment.

Unbound 0.3

Features

• Forwarder with RRset cache.
• This code is pre-beta and not recommended for operational deployment.

Unbound 0.2

Features

• Basic caching forwarder
• This code is pre-beta and not recommended for operational deployment.

Unbound 0.1

Features

• Threaded non-caching forwarder.
• This code is pre-beta and not recommended for operational deployment.

Unbound 0.0

Features

• Build environment, configure, make and a non-caching DNS forwarder.
• This code is pre-beta and not recommended for operational deployment.