1 Internet Systems Consortium DHCP Distribution
2 Version 4.4.0-pre-alpha
9 The major "theme" for ISC DHCP 4.3.x was to update the support for
10 DHCPv6 to include several of the features that have been available
11 for DHCPv4. These include:
13 - Support the use of classes
15 - Support for on_commit, on_expiry and on_release statements
17 - Better logging of address assignments
19 - Support for using DHCPv6 relay options in expressions
21 This release also adds support for the standard DDNS as described in the
22 current RFCs as well as enhancing support for dynamically adding and removing
25 There are a number of DHCPv6 limitations and features missing in this
26 release, which will be addressed in the future:
28 - Only Solaris, Linux, FreeBSD, NetBSD, and OpenBSD are supported.
30 - DHCPv6 includes human-readable text in status code messages, in
31 English. A method to reconfigure or support other languages would
34 - The "host-identifier" option is limited to a simple token.
36 - The client and server can only operate DHCPv4 or DHCPv6 at a time,
37 not both. To use both protocols simultaneously, two instances of the
38 relevant daemon are required, one with the '-6' command line option.
40 For information on how to install, configure and run this software, as
41 well as how to find documentation and report bugs, please consult the
44 ISC DHCP uses standard GNU configure for installation. Please review the
45 output of "./configure --help" to see what options are available.
47 The system has only been tested on Linux, FreeBSD, and Solaris, and may not
48 work on other platforms. Please report any problems and suggested fixes to
51 ISC DHCP is open source software maintained by Internet Systems
52 Consortium. This product includes cryptographic software written
53 by Eric Young (eay@cryptsoft.com).
55 Changes since 4.3.0 (new features)
57 - Insert the raw data from a fully encapsualted option into the option cache.
58 This allows "exists" to check for the option if any sub options exist. It
59 also adds the raw data to the environment variables supplied to the client
63 - Removed an extraneous expression in omapi socket callback function. Prior
64 to this change, the logic was techinically incorrect but other factors
65 ensured the outcome itself was correct. This change was made primarily
66 for code clarity. Thanks to Ganesh Pinjala for bringing the issue to our
70 - Corrected a bug which could cause the server to sporadically crash while
71 loading lease files with the lease-id-format is set to "hex". Our thanks
72 to Jay Ford, University of Iowa for reporting the issue.
75 - Pass configure arguments which begin with an upper case letter, e.g.
76 CFLAGS, to the embedded bind configure, so it is no longer required
77 to use environment variables to get the same effect.
80 - Added --enable-kqueue, --enable-epoll, --enable-devpoll and a more
81 general --with-bind-extra-config to pass extra options to the
82 embedded bind configure. Note we had mixed experiences with this
83 so it is at the user risk, i.e., they are NOT SUPPORTED yet.
86 - Changed the way the embedded bind Makefile is updated by configure.
87 The only user visible side effect is that --with-libbind now requires
88 either "no" or an (absolute) path, i.e. "yes" is no longer valid.
91 - Eliminated a noisy, but otherwise harmless debug log statment that may
92 appear during server startup when building with --enable-binary-leases
93 and configuring multiple pools in a shared network. Thanks to Fernando
94 Soto from BlueCat Networks for reporting the issue and supplying a patch.
97 - Added the support for git repositories in the util/bind.sh script.
98 When you build ISC DHCP from a git repo, i.e., without a "bind"
99 directory populated as in the release distribution file, you may now
100 create the bind directory, change to it and clone the private
101 (repo.isc.org/proj/git/prod/bind9.git) or the public
102 (https://source.isc.org/git/bind9.git) git repository into
103 bind/bind9 and then invoke the util/bind.sh script as usual.
104 Note this option is incompatible with "make dist" (and make "distcheck")
105 because no bind/bind.tar.gz nor bind/version.tmp files are available.
108 - Use the embedded bind libraries where they are built (vs where they
112 - Use last version (9.11) of plain embedded bind libraries in place of
113 older (9.9) version of export bind libraries.
116 - Using "make distcheck" now works with external bind libraries (aka
117 configure --with-libbind).
120 - Added --enable-bind-install to install embedded bind includes and
121 libraries. Default is to not install them (it was the previous
122 behavior). If you'd like to change the includedir and/or libdir
123 installation directories you must pass them using the
124 --with-bind-extra-config configuration arguments.
127 Changes since 4.3.0 (bug fixes)
129 - Tidy up several small tickets.
130 Correct parsing of DUID from config file, previously the LL type
131 was put in the wrong place in the DUID string.
133 Add code to parse "do-forward-updates" as well as "do-forward-update"
134 Thanks to Jiri Popelka at Red Hat.
136 Remove log_priority as it isn't currently used.
138 Increase the size of the buffer used for reading interface information.
141 - Remove an extra set of the msg_controllen variable.
144 - Add a more understandable error message if a configuration attempts
145 to add multiple keys for a single zone. Thanks to a patch from Jiri
149 - Fix some minor issues in the dst code.
152 - Properly #ifdef functions so that the code can compile without NSUPDATE.
155 - Update the partner's stos (start time of state, basically when we last
156 heard from this partner) field when updating the state in failover.
159 - Modify the overload processing to allow space for the remote agent ID.
161 Handle the ordering of the SUBNET_MASK option even if it is the last
165 - Remove the code that allows a server to follow RFC3315 instead of
166 the subsequent errata from August 2010 when determining which IAs
167 to include if no addresses will be assigned.
170 - Remove unused RCSID tags.
173 - Correct the v6 client timing code. When doing the timing backoff
174 for MRT limit it to MRD.
175 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
178 - Add a log entry when killing a client and remove the PID files
179 when a server, relay or client are killed.
183 - Some minor cleanups in the client code.
184 In addition to checking for dhcpc check for bootpc in the services list.
186 Correct the client code to only try to get a lease once when the
187 given the "-1" argument.
188 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
190 When asked for the version don't send the output to syslog.
192 Add the next server information to the environment variables for
193 use by the client script. In order to avoid changing the client
194 lease file the next server information isn't written to it.
195 Thanks to Tomas Hozza at Red Hat for the suggestion and a prototype fix.
198 - Several updates to the dhcp server code.
199 When not in quiet mode print out the files being used.
201 As accessing some pid files may require privileges move the dropping
202 of permission bits due to the paranoia patch to be after the pid code.
203 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
205 When processing a "--version" request don't output the version information
208 - Add the "enable-log-pid" build option to the configure script. When enabled
209 this causes the client, server and relay programs to include the PID
210 number in syslog messages.
211 Thanks to Marius Tomaschewski for the suggestion and proto-patch.
214 - Add a #define to specify the prefix length used when a client attempts
215 to configure an address. This can be modified by editing includes/site.h.
216 By default it is set to 64. While 128 might be a better choice it would
217 also be a change for currently running systems, so we have left it at 64.
220 - Add a run time option to the client "-df" to allow the administrator to
221 point to a second lease file the client can search for a DUID. This can
222 be used to allow a v4 and a v6 instance of the client to share a DUID.
223 The second file will only be searched if there isn't a DUID in the main
224 lease file and the DUID will be written out to the main lease file.
227 - Have the client fsync the lease file to avoid lease corruption if the
228 client hibernates or otherwise shuts down.
231 - Add a check for L2VLAN in bpf.c to help support VLAN interfaces
232 Thanks to Steinar Haug for the suggestion.
235 - Modify the handling of the resolv.conf file to allow the DHCP
236 process to start up even if the resolv.conf file has problems.
239 - Add threshold logging functionality. Two new options,
240 log-threshold-low and log-threshold-high, indicate to the
241 server if and when it should log an error message as addresses
245 - Add code to properly dereference a pointer in the dhclient code
246 on an error condition.
249 - Add code to help clean up soft leases.
252 - Disable the gentle shutdown functionality until we can determine
253 the best way to present it to remove or reduce the side effects.
256 - Modify the message displayed when a process hits a fatal error.
257 The new message is much shorter and simply points to the README
258 and our website for directions on bug submissions.
261 - Handle an absent resolv.conf file better.
264 - Tidy up receive packet processing.
265 Thanks to Brad Plank of GTA for reporting the issue and suggesting
269 - Corrected parser's right brace matching when a statement contains an error.
272 - TSIG-authenticated dynamic DNS updates now support the use of these
273 additional algorithms: hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384,
277 - Added check for invalid failover message type. Thanks to Tobias Stoeckmann
278 working with the OpenBSD project who spotted the issue and provided the
282 - Corrected rate limiting checks for bad packet logging. Thanks to Tobias
283 Stoeckmann working with the OpenBSD project who spotted the issue and
287 - Log statements depicting what files will be used by the server now occur
288 after the configuration file has been processed.
291 - Addressed Coverity issues reported as of 07-31-2014:
292 [ISC-Bugs #36712] Corrects Coverity reported "high" impact issues.
293 [ISC-Bugs #36933] Corrects Coverity reported "medium" impact issues
294 [ISC-Bugs #37708] Fixes compilation error in dst_api.c seen in older
295 compilers that was introduced by #36712
297 - Server now supports a failover split value of 256.
300 - Remove unneeded error #defines. These defines were included in case
301 external programs required the older versions of the macro. They
302 have been #ifdeffed for now and will be removed at a future date.
303 See site.h for the #define to include them again, but you should
304 switch to using the DHCP_R_* versions instead of the ISC_R_* versions.
305 Also ISC_R_MULTIPLE has been removed as it is also defined in bind.
308 - Added checks in range6 and prefix6 statement parsing to ensure addresses
309 are within the declared subnet. Thanks to Jiri Popelka at Red Hat for the
310 bug report and patch.
317 - Addressed checksum issues:
318 Added checksum readiness check to Linux packet filtering which eliminates
319 invalid packet drops due to checksum errors when checksum offloading is
320 in use. Based on dhcp-4.2.2-xen-checksum.patch made to the Fedora project.
327 Inbound packets with UDP checksums of 0xffff now validate correctly rather
332 - Added the echo-client-id configuration parameter to the server configuration.
333 The server now supports RFC 6842 compliant behavior by setting a new
334 configuration parameter, echo-client-id. When enabled, the server will
335 include the client identifier option (Option code 61) if received, in its
336 responses. The server identifier returned in NAKs (if enabled) will now
337 be the globally defined value (if one) if the server cannot attribute the
338 inbound request to a known subnet.
342 - Added support of the configuration parameter, use-host-decl-names, to
343 BOOTP request handling.
346 - Added logic to ignore the signal, SIGPIPE, which ensures write failures
347 will be delivered as errors rather than as SIGPIPE signals on all OSs.
348 Thanks to Marius Tomaschewski from SUSE who reported the issue and provided
349 the patch upon which the fix is based.
352 - In the failover code, handle the case of communications being interrupted
353 when the servers are dealing with POTENTIAL-CONFLICT. This patch allows
354 the primary to accept the secondary moving from POTENTIAL-CONFLICT to
355 RESOLUTION-INTERRUPTED as well as handling the bind update process better.
356 In addition the code to resend update or update all requests has been
357 modified to send requests more often.
361 - By default, the server will now choose the value to use in the forward DNS
362 name from the following in order of preference:
364 1. FQDN option if provided by the client
365 2. Host name option if provided by the client
366 3. Configured option host-name if defined
368 As before, this may be overridden by defining ddns-hostname to the desired
369 value (or expression). In addition, the server logic has been extended to
370 use the value of the host name declaration if use-host-decl-names is enabled
371 and no other value is available.
374 - DNS updates were being attempted when dhcp-cache-threshold enabled the use of
375 the existing lease and the forward DNS name had not changed. This has been
380 - Corrected an issue which caused dhclient to incorrectly form the result when
381 prepending or appending to the IPv4 domain-search option, received from the
382 server, when either of the values being combined contain compressed
386 - Added the server-id-check parameter to the server configuration.
387 This parameter allows run-time control over whether or not a server,
388 participating in failover, verifies the dhcp-server-identifier option in
389 DHCP REQUESTs against the server's id before processing the request.
390 Formerly, enabling this behavior was done at compilation time through
391 the use of the #define, SERVER_ID_CHECK, which has been removed from site.h
392 The functionality is now only available through the new runtime parameter.
395 - During startup, when the server encounters a lease whose binding state is
396 FTS_BACKUP but whose pool has no configured failover peer, it will reset the
397 lease's binding state to FTS_FREE. This allows the leases to be reclaimed
398 by the server after a pool's configuration has changed from failover to
399 standalone. Prior to this such leases would remain stuck in the backup state
400 making them unavailable for assignment. Note this conversion will occur
401 whether or not the server is compiled for failover.
404 - Fixed a small issue in the treatment of hosts in the inform processing
405 that could cause the response to an inform to include information from
406 the wrong scope. The two examples we've heard of are getting subnet
407 instead of group information associated with a host entry, or getting
408 global information instead of subnet if the host entry was built via
409 omapi. Thanks to Julien Soula at University of Lille for finding the
410 bug and supplying a patch.
413 - Avoid calling pool_timer() recursively from supersede_lease(). This could
414 result in leases changing state incorrectly or delaying the running of the
415 leae expiration code.
418 - Move the check for a PID file and process to be before we rewrite the
419 lease file. This avoids the possibility of starting a second instance
420 of a server which changes the current lease file confusing the first
421 instance. This check is only included if the admin hasn't disabled PID
426 - In the client code change the way preferred_life and max_life are printed
427 for environment variables to be unsigned rather than signed.
428 Thanks to Jiri Popelka at Red Hat for the bug report and patch.
431 - Modified Linux packet handling such that packets received via VLAN are now
432 seen only by the VLAN interface. Prior to this, such packets were seen by
433 both the VLAN interface and its parent (physical) interface, causing the
434 server to respond to both. Note this remains an issue for non-Linux OSs.
435 Thanks to Jiri Popelka at Red Hat for the patch.
441 - Log content has been changed to more directly suggest that admins should
442 check for multiple IPv6 clients attempting to use the same DUID when only
443 abandoned addresses are available. Debug level logging will now emit counts
444 of the total number of, in-use, and abandoned addresses in a shared subnet
445 when the server finds no addresses available for a given DUID. Lastly,
446 threshold logging is now automatically disabled for shared subnets whose
447 total number of possible addresses exceeds (2^64)-1.
451 - Added a global parameter, prefix-length-mode, which may be used to determine
452 how the server uses a non-zero value for prefix-length supplied by clients
453 when soliciting DHCPv6 prefixes. The server supports selection modes of:
454 ignore, prefer, exact, minimum and maximum which are described in detail in
455 the server man pages. The prior behavior of the server was to only offer a
456 prefix whose length exactly matched the prefix-length value requested. If
457 no such prefixes were available, the server returned a status of none
458 available. Note the default mode, "exact", provides this same behavior.
462 - Corrected inconsistencies in dhcrelay's setting the upper interface hop count
463 limit such that it now sets it to 32 when the upstream address is a multicast
464 address per RFC 3315 Section 20. Prior to this if the -u argument preceded
465 the -l argument on the command line or if the same interface was specified
466 for both; the logic to set the hop limit count for the upper interface was
467 skipped. This caused the hop count limit to be set to the default value
468 (typically 1) in the outbound upstream packets.
471 - Modify the linux and openwrt dhclient scripts to process information
472 from a stateless request. Thanks to Jiri Popelka at Red Hat for the
473 bug report and patch.
476 - Remove more unused RCSID tags. These weren't noticed in 4.3 as
477 the code isn't used anymore but we remove them here to keep the
478 code consistent across versions.
481 - The server now does a better check to see if it can allocate the memory
482 for large blocks of v4 leases and should provide a slightly better error
483 message. Note well: the server pre-allocates v4 addresses, if you use
484 a large range, such as a /8, the server will attempt to use a large
485 amount of memory and may not start if there either isn't enough memory
486 or the size exceeds what the code supports.
489 - The server will now reject unicast Request, Renew, Decline, and Release
490 messages from a client unless the server would have sent that client the
491 dhcp6.unicast option. This behavior is in compliance with paragraph 1 in
492 each of the sections 18.2,1, 18.2.3, 18.2.6, and 18.2.7 of RFC 3315. Prior
493 to this, the server would simply accept the messages. Now, in order for
494 the server to accept such a message, the server configuration must include
495 the dhcp6.unicast option either globally or within the shared network to
496 which the requested lease belongs. In other words, the server will map
497 the first IA_XX address found within the client message to a shared-network
498 and look for the presence of the unicast option there and then globally.
499 Thanks to Jiri Popelka at Red Hat for this issue and his patch which
503 - The ATF (Automated Testing Framework) tools used for optional unit tests
504 can now be built from its embedded sources in bind, solving the
505 atf-run / atf-report issue with recent (>= 0.20) versions of ATF.
506 The new configuration option is "./configure --with-atf=bind".
507 [ISC-Bugs #38754, #39300]
509 - Corrected a compilation error introduced by the fix for ISC-Bugs #22806.
510 On older linuxes that do not include the tpacket_auxdata structure don't
511 bother allocating the cmsgbuf as it isn't necessary and we don't have
512 a proper length for it.
515 - Remove the dst directory. This was replaced in 4.2.0 with the dst
516 code from the Bind libraries but we continued to include it for
517 backwards compatibility. As we have now released 4.3.x it seems
518 reasonable to remove it.
521 - Write out the DUID server id on startup in all cases, previously if it
522 was read in from server-duid option in the config or lease files for
523 DHCPv4 it would not be written to the new lease file.
526 - When parsing dates for leases convert dates past 2038 to "never".
527 This avoids problems with integer overflows in the date and time
528 handling code for people that decide to use very large lease times
529 or add a lease entry with a date far in the future.
532 - Leave the siaddr field clear when sending a NACK as per RFC 2131
536 - In the client don't send expired addresses to the script as part of
537 the binding process. Thanks to Sven Trenkel at Google for reporting
538 the issue and suggesting the patch.
541 - While parsing IPv6 addresses treat "add" as part of the address instead
545 - Add support for accessing the v4 lease queues (active, free etc) in a
546 binary fashion instead of needing to walk through a linear list to
547 insert, find or remove an entry from the queues. In addition add a
548 compile time option "--enable-binary-leases" to enable the new code
549 or to continue using the old code. The old code is the default.
550 Thanks to Fernando Soto from BlueCat Networks for the patch.
553 - Delayed-ack now works properly with Failover. Prior to this, bind updates
554 post startup were being queued but never delivered. Among other things, this
555 was causing leases to not transition from expired or released to free.
558 - Clean up parsing of v6 lease files a bit to avoid infinite loops if the
559 lease file is corrupt in certain ways.
562 - Corrected a crash in dhclient that occurs during lease renewal if the
563 client is performing its own DNS updates. Thanks to Jiri Popelka at Red Hat
567 - Corrected an issue in v6 lease file parsing. Prior to this, when encountering
568 a lease with an address for which no configured pool exists, the server was
569 declaring the lease file corrupt and incorrectly skipping over the subsequent
570 entry in the file. The server will now emit a log message indicating that
571 no pool was found for the address (or prefix) and correctly resume parsing
572 with the next entry in the lease file. Our thanks to Michal Žejdl for
576 - Be more liberal in finding a subnet group associated with a static
577 prefix. When we added the class matching code for v6 we also added
578 a requirement that the static prefix must be within a subnet the
579 client was in, in order to find the proper statements. We now
580 look for a subnet based on the prefix, failing that on the static
581 address for the client and failing that on the shared network
585 - Add a new action expression "parse_vendor_options", which can be used
586 to parse a vendor-encapsualted-option received by the server based on
587 the encoding specified by the vendor-option-space statement.
590 - Enhance the PARANOIA patch to include fchown() the lease file to
591 allow it to be manipulated after the server does a chown().
592 Thanks to Jiri Popelka at Red Hat for the patch.
595 - Relax the requirement that prefix pools must be within the subnet.
596 This was added in as part of #32453 in order to avoid configuration
597 mistakes but is being removed as prefixes aren't required to be
598 within the same subnet and many people configure them in that fashion.
601 - Fixed a server crash that could occur when the server attempts to remove
602 the billing class from the last lease billed to a dynamic class after said
603 class has been deleted. Our thanks to Lasse Pesonen for reporting the
607 - LDAP Patches - Numerous small patches submitted by contributors have
608 been applied to the contributed code which supplies LDAP support.
609 In addition, two larger submissions have also been included. The
610 first adds support for IPv6 configuration and the second provides
611 GSSAPI authentication. We would like to thank the following for their
612 contributions (alphabetically):
614 Bill Parker (wp02855 at gmail dot com)
615 Jiri Popelka at Red Hat
616 Marius Tomaschewski at SUSE
617 (william at adelaide.edu.au), The University of Adelaide
633 - Handle an out of memory condition in the client a bit better.
634 Thanks to Frédéric Perrin from Brocade for finding the issue
635 and suggesting a patch.
638 - Corrected a compilation error introduced by the fix for ISC-Bugs #37415.
639 The error occurs on Linux variants that do not support VLAN tag information
640 in packet auxiliary data. The configure script now only enables inclusion
641 of the VLAN tag-based logic if it is supported by the underlying OS.
644 - Specifying the option, --disable-debug, on the configure script command line
645 now disables debug features. Prior to this, specifying --disable-debug
646 incorrectly enabled debug features. Thanks to Gustavo Zacarias for reporting
650 - Unit test execution now uses a path augmented during configuration
651 processing of the --with-atf option to locate ATF runtime tools, atf-run
652 and atf-report. For most installations of ATF, this should alleviate the
653 need to manually include them in the PATH, as was formerly required.
654 If the configure script cannot locate the tools it will emit a warning,
655 informing the user that the tools must be in the PATH when running unit
657 Secondly, please note that "make check" will now exit with a failure status
658 code (non-zero) if one or more unit tests fail. This means that invoking
659 "make check" from an upper level directory will cause the make process to
660 STOP after the first test subdirectory with failed test(s). To force all
661 tests in all subdirectories to run, regardless of individual test outcome,
662 use the command "make -k check".
665 - Corrected a static analyzer warning in common/execute.c
668 - ISC DHCP now follows the common convention to use the base name a
669 program is invoked with (aka argv[0], vs. a builtin name) for
670 logs. This should help differentiate syslog entries for DHCPv4 and
671 DHCPv6 servers. You can define OLD_LOG_NAME in includes/site.h to
672 keep the previous behavior.
675 - The Linux packet filter code now correctly treats only the least significant
676 12 bits in an inbound packet's TCI value as the VLAN id (per IEEE 802.1Q).
677 Prior to this it was using the entire 16 bit value as the VLAN id and
678 incorrectly discarding packets. Thanks to Jiri Popelka at Red Hat for
679 reporting this issue and supplying its patch.
682 - Fixed several static analysis issues such as potential null
683 references, unchecked strdup returns. Thanks to Bill Parker (wp02855 at
684 gmail dot com) who identified these issues and supplied patches to
689 - Corrected compilation errors that prohibited building the server
690 and its ATF unit tests when failover is disabled.
693 - Added the lease address to the end of the debug level log message
694 emitted when an existing lease is renewed within the dhcp-cache-threshold.
695 Thanks to Nathan Neulinger at Missouri S&T for suggesting the change.
698 - Added dhcpv6 and delayed-ack to settings listed in the "Features:"
699 section of the configure script output. Additionally, all of the
700 features reported on will now always show either a "yes" or "no"
701 value. Prior to this features left to their default setting would
705 - Added a parameter, authoring-byte-order, to the lease file. This value
706 is automatically added to the top of new lease files by the server and
707 indicates the internal byte order (big endian or little endian) of the
708 server. This permits lease files generated on a server with one form of
709 byte order to be used on a server with the opposite form. Our thanks to
710 Timothe Litt for calling this to our attention and for the suggestions
714 - Fixed a small memory leak in the DHCPv6 version of the client code.
715 This is unlikely to cause significant issues in actual use.
718 - Corrected a few minor memory leaks in omapi's dereferencing of
719 host objects. Thanks to Jiri Popelka at Red Hat for reporting
720 the issue and supplying the patches.
724 - Cleaned up some of the Make infrastructure to make --with-libbind
725 work better. Though it still only works with an absolute path.
728 - Made the embedded bind libraries able to be cross compiled
729 (please refer to the bind9 documentation to learn how to cross
730 compile DHCP and its bind library dependency).
733 - Update the client code to better support getting IA_NAs and IA_PDs
734 in the same packet, see RFC7550 for some discussion.
737 ! Update the bounds checking when receiving a packet.
738 Thanks to Sebastian Poehn from Sophos for the bug report and a suggested
743 - When handling an incorrect command line for dhcpd, dhclient or dhcrelay
744 print out a specific error message about the first error in addition
745 to the usage string. This may be disabled by editing includes/site.h.
749 - The configure script will now exit with an error message if it cannot find
750 a GNU-style make tool (needed when building BIND libraries) or pkg-config
751 (needed to locate ATF used for building unit tests). Prior to this the
752 script would exit indicating success causing subsequent attempts to build
753 the software to fail.
756 - Properly terminate strings before passing them to regex and fix
757 a boundary error when creating certain new data strings.
758 Thanks to Andrey Jr. Melnikov for the bug report.
761 - Option expressions, such as prepend and append, are now supported when
762 running dhclient for IPv6. Prior to this such statements in the
763 client configuration file would be parsed but have no affect. Thanks
764 to Jiri Popelka at Red Hat for reporting the issue.
767 - A failover primary server will now accept a binding status update from the
768 secondary which transitions a lease from ACTIVE to ABANDONED. This accounts
769 for instances in which a client declines a lease and only the secondary
770 server receives it. Prior to this the primary server would reject such an
771 update as an "invalid state transition".
774 - Properly allocate memory for a bpf filter.
775 Thanks to Bill Parker (wp02855 at gmail dot com) who identified this issue.
778 - Updated contrib/dhcp-lease-list.pl to handle garbage in the oui file better
779 and to print out the hostnames a bit better.
780 Thanks to Antoine Beaupré from Debian for the suggested patch.
783 - The DHCPv6 server now handles long valid and preferred lease times better.
784 Values that would cause the internal end time of the lease to wrap are
785 modified to work as infinite.
788 - Updated support for cross compiling by allowing the library archiver
789 to be set at configure time via the environment variable 'AR'.
792 - The server will now match DHCPv6 relayed clients to host declarations
793 which include the "hardware" statement, if the relay connected to the
794 client supplies the client's hardware address via client-linklayer-address
795 option as per RFC 6939.
798 - Allow a filename to be specified instead of /dev/random during
799 configuration. This is passed to the BIND configuration to allow
800 for cross compilation.
803 - Add more option definitions.
806 - Correct outputting of long lines in the lease file when writing
807 a lease that includes long strings in an execute statement.
810 - The server will now correctly treat a lease as reserved when the client
811 requests an infinite lease time (i.e. OxFFFFFFFF) and "infinite-is-reserved"
812 is enabled. Prior to this the server would halt. In addition, corrections
813 were made to the server to allow a lease's flags field to be set via omapi.
814 Prior to this, the server, depending on the host architecture, would
815 incorrectly parse the new flags value from the omapi message.
818 - ISC DHCP can now be configured and built from a directory other than
819 the top level source directory. Note that "make distcheck" uses this
823 - Add support for RFC 3527 to dhcrelay. A new, dhcrelay command line argument,
824 "-U <interface>" enables the addition of a RFC 3527 compliant link selection
825 suboption to the agent option added for clients directly connected to the
830 - Add a new global DHCPv6 option, dhcpv6-set-tee-times, which when enabled
831 instructs the server to calculate T1 and T2 as recommended in RFC 3315,
835 - Corrected minor Coverity issues.
838 - Add support for RFC 7341 DHCPv4 over DHCPv6 with a new configuration
839 option "--enable-dhcpv4o6". Note this feature requires DHCPv6 support
840 and is not compatible with delayed-ack. Both client and server use 2
841 processes which communicate over UDP on a pair of sockets. The new
842 "-4o6 <port>" command line argument enables DHCPv4 over DHCPv6 support
843 and specifies the consecutive ports to use for inter-process communication.
844 Please look at doc/DHCPv4-over-DHCPv6 for more details.
847 - Correct interface name formation when using DLPI under Solaris 11. As of
848 Solaris 11, ethernet device files are located in "/dev/net". The configure
849 script has been modified to detect this situation and adjust the directory
850 used accordingly. Thanks to Jarkko Torppa for reporting this issue and
855 - Add a dereference call when handling an error condition while
859 - Add a new parameter, lease-id-format, to both dhcpd and dhclient. The
860 parameter controls the format in which certain values are written to lease
861 files. Formats supported are octal - quoted string containing octal
862 escapes, and hex - unquoted, colon separated hex digits. Thanks to
863 Jay Ford, University of Iowa for bringing the issue to our attention.
866 ! Add an option in site.h to limit the number of failover and control
867 connections the server will accept. By default this is 200.
871 - Fixed util/bindvar.sh error handling.
874 - Correct error message in relay to use remote id length instead
875 of circuit id length.
878 - Add support for including an encapsulated option in a response
879 from the DHCPv6 server. This allows the v6 FQDN option to be
880 returned in responses.
883 - Add logic to test directory Makefiles to avoid copying Attfile(s)
884 when building within the source tree. This eliminates a noisy but
885 otherwise harmless error message when running "make check".
888 - Leases are now scrubbed of certain prior use information when pool
889 re-balancing reassigns them from one FO peer to the other. This
890 corrects an issue where leases that were offered but not used
891 by the client retained the client hostname from the original
892 client. Thanks to Pavel Polacek, Jan Evangelista Purkyne University
893 for reporting the issue.
896 - In the LDAP code and schema add some missing '6' characters to use
897 the v6 instead of the v4 versions. Thanks to Denis Taranushin for
898 reporting this issue and supplying its patch.
901 - Correct how the pick-first-value expression is written to a lease
902 file. Previously it was written as a concat expression due to
903 a cut and paste error.
906 - Modify the DDNS code to clean up the PTR record even if there
907 are issues while cleaning up the A or AAAA records.
910 - Added global configuration parameter, abandon-lease-time, which determines
911 the amount of time a lease remains abandoned. The default is 84600 seconds.
912 Additionaly, the server now conducts a ping check (if ping checks are
913 enabled) prior to offering an abandoned lease to client. Our thanks to
914 David Zych at University of Illinois for reporting the issue and working
915 with us to produce a viable solution.
918 - Correct handling of interface names during interface discovery. This
919 addresses an issue where interface names of 15 characters in length
920 could lead to crashes or interface recognition errors during startup
921 of dhcpd, dhclient, and dhcrelay.
924 - Updates to contrib/dhcp-lease-list.pl to make it more friendly.
925 The updates are: looking for the lease file in more places and skipping
926 the "processing complete" output when creating machine readable
927 output. Thanks to Cameron Paine (cbp at null dot net) for the
931 - When reusing a lease for dhcp-cache-threshold return the hostname
932 to the original lease. Also if the host pointer, UID or hardware address
933 change don't allow reuse of the lease.
934 Thanks to Michael Vincent for reporting this and helping us
935 verify the problem and fix.
938 - Change dmalloc to use a size_t as the length argument to bring it
939 in line with the call it will make to malloc().
942 - If the failover socket can't be bound, close it. Otherwise if the
943 user configures an incorrect address in the failover stanza the
944 server will continue to open new sockets every 90 seconds until
948 - Add DHCPv4-mode, dhcrelay command line options, "-iu" and "-id", that
949 allow interfaces to be upstream or downstream respectively. Upstream
950 interfaces will accept and forward only BOOTP replies, while downstream
951 interfaces will accept and forward only BOOTP requests.
954 - Clean up some memory references in the vendor-class construct.
957 Changes since 4.2.0 (new features)
959 - If a client renews before 'dhcp-cache-threshold' percent of its lease
960 has elapsed (default 25%), the server will reuse the allocated lease
961 (provide a lease within the currently allocated lease-time) rather
962 than extend or renew the lease. This absolves the server of needing
963 to perform an fsync() operation on the lease database before reply,
964 which improves performance. [ISC-Bugs #22228]
965 Updated this patch to support asynchronous DDNS. If the server is
966 attempting to do DDNS on a lease it should be updated and written to
967 disk even if that wouldn't be necessary due to the thresholding.
970 - The 'no available billing' log line now also logs the name of the last
971 matching billing class tried before failing to provide a billing.
974 - A problem with missing get_hw_addr function when --enable-use-sockets
975 was used is now solved on GNU/Linux, BSD and GNU/Hurd systems. Note
976 that use-sockets feature was not tested on those systems. Client and
977 server code no longer use MAX_PATH constant that is not defined on
978 GNU/Hurd systems. [ISC-Bugs #25979]
980 - Add a perl script in the contrib directory, dhcp-lease-list.pl, which
981 can parse v4 lease files and output the lease information in a more
982 human friendly manner. This was written by Christian Hammers with
983 some updates by vom and ISC. This is contributed code and is not
984 supported by ISC; however it may be useful to some users.
987 - Add support in v6 for on-commit, on-expire and on-release.
990 - Add support for using classes with v6.
993 - Update the DDNS code to current standards and allow for sharing
994 of DDNS entries between v4 and v6 clients. The new code is used
995 if the ddns-update-style is set to "standard", the older code is
996 still available if ddns-update-style is set to "interim". The
997 oldest DDNS code "ad-hoc" has been removed. Thanks to Thomas Pegeot
998 who submitted a patch for this issue. This patch is based on
999 that work with some modifications.
1002 - Add a configuration option to the server to suppress using fsync().
1003 Enabling this option will mean that fsync() is never called. This
1004 may provide better performance but there is also a risk that a lease
1005 will not be properly written to the disk after it has been issued
1006 to a client and before the server stops. Using this option is
1010 - Add some logging statements to indicate when the server is ready
1011 to serve. One statement is emitted after the server has finished
1012 reading its files and is about to enter the dispatch loop.
1013 This is "Server starting service.".
1014 The second is emitted when a server determines that both it and
1015 its failover peer are in the normal state.
1016 This is "failover peer <name>: Both servers normal."
1019 - Add support for accessing options from v6 relays. The v6relay
1020 statement allows the administrator to choose which relay to
1021 use when searching for an option, see the dhcp-options man page
1022 for a description. The host-identifier option has also been
1023 updated to support the use of relay options, see the dhcpd.conf
1024 man page for a description.
1027 - When doing DDNS if there isn't an appropriate zone statement attempt
1028 to find a reasonable nameserver via a DNS resolver. This restores
1029 some functionality that was lost in the transition to asynchronous
1030 DDNS. Due to the lack of security and increase in fragility of the
1031 system when using this feature we strongly recommend the use of
1032 appropriate zone statements rather than using this functionality.
1035 - Add support for specifying the address from which to send
1036 DDNS updates on the DHCP server. There are two new options
1037 "ddns-local-address4" and "ddns-local-address6" that each take
1038 one instance of their respective address types.
1041 - Add ignore-client-uids option in the server. This option causes
1042 the server to not record a client's uid in its lease. This
1043 violates the specification but may also be useful when a client
1044 can dual boot using different client ids but the same mac address.
1045 Thank you to Brian De Wolf at Cal Poly Pomona for the patch.
1049 - Extend the DHCPINFORM processing to honor the subnet selection option
1050 and take host declarations into account.
1051 Thanks to Christof Chen for testing and submitting the patch.
1054 - Extend the hardware expression to look into the lease structure
1055 for a hardware address if there is no packet. This allows the
1056 server to find the hardware address during on-expiry processing.
1059 - Add definitions for some options that have been specified by the IETF.
1063 Changes since 4.2.0 (bug fixes)
1065 - When using 'ignore client-updates;', the FQDN returned to the client
1066 is no longer truncated to one octet.
1068 - Cleaned up an unused hardware address variable in nak_lease().
1070 - Manpage entries for the ia-pd and ia-prefix options were updated to
1071 reflect support for prefix delegation.
1073 - Cleaned up some compiler warnings
1075 - An optimization described in the failover protocol draft is now included,
1076 which permits a DHCP server operating in communications-interrupted state
1077 to 'rewind' a lease to the state most recently transmitted to its peer,
1078 greatly increasing a server's endurance in communications-interrupted.
1079 This is supported using a new 'rewind state' record on the dhcpd.leases
1080 entry for each lease.
1082 - Fix the trace code which was broken by the changes to the DDNS code.
1084 - Update the fsync code to work with the changes to the DDNS code. It now
1085 uses a timer instead of noticing if there are no more packets to process.
1087 - When constructing the DNS name structure from a text string append
1088 the root to relative names. This satisfies a requirement in the DNS
1089 library that names be absolute instead of relative and prevents DHCP
1090 from crashing. [ISC-Bugs #21054]
1092 - "The LDAP Patch" that has been circulating for some time, written by
1093 Brian Masney and S.Kalyanasundraram and maintained for application to
1094 the DHCP-4 sources by David Cantrell has been included. Please be
1095 advised that these sources were contributed, and do not yet meet the
1096 high standards we place on production sources we include by default.
1097 As a result, the LDAP features are only included by using a compile-time
1098 option which defaults off, and if you enable it you do so under your
1099 own recognizance. We will be improving this software over time.
1102 - Prohibit including lease time information in a response to a DHCP INFORM.
1105 ! Accept a client id of length 0 while hashing. Previously the server would
1106 exit if it attempted to hash a zero length client id, providing attackers
1107 with a simple denial of service attack. [ISC-Bugs #21253]
1108 CERT: VU#541921 - CVE: CVE-2010-2156
1110 - A memory leak in ddns processing was closed. [ISC-Bugs #21377]
1112 - Modify the exception handling for initial context creation. Previously
1113 we would try and clean up before exiting. This could present problems
1114 when the cleanup required part of the context that wasn't available. It
1115 also didn't do much as we exited afterwards anyway. Now we simply log
1116 the error and exit. [ISC-Bugs #21093]
1118 - A bug was fixed that could cause the DHCPv6 server to advertise/assign a
1119 previously allocated (active) lease to a client that has changed subnets,
1120 despite being on different shared networks. Dynamic prefixes specifically
1121 allocated in shared networks also now are not offered if the client has
1122 moved. [ISC-Bugs #21152]
1124 - Add some debugging output for use with the DDNS code. [ISC-Bugs #20916]
1126 - Fix the trace code to handle timing events better and to truncate a file
1127 before using instead of overwriting it. [ISC-Bugs #20969]
1129 - Modify the determination of the default TTL to use for DDNS updates.
1130 The user may still configure the ttl via ddns-ttl. The default for
1131 both v4 and v6 is now 1/2 the (preferred) lease time with a limit. The
1132 previous defaults (1/2 lease time without a limit for v4 and a default
1133 value for v6) may be used by defining USE_OLD_DDNS_TTL in site.h
1136 - libisc/libdns is now brought up to version 9.7.1rc1. This corrects
1137 three reported flaws in ISC DHCP;
1139 o DHCP processes (dhcpd, dhclient) fail to start if one of either the
1140 IPv4 or IPv6 address families is not present. [ISC-Bugs #21122]
1142 o Assertion failure when attempting to cancel a previously running DDNS
1143 update. [ISC-Bugs #21133]
1145 o Compilation failure of libisc/libdns due to the use of a flexible
1146 array member. [ISC-Bugs #21316]
1148 - Add declaration for variable in debug code in alloc.c. [ISC-Bugs #21472]
1150 - Documentation cleanup covering multiple tickets
1151 [ISC-Bugs #20265] [ISC-Bugs #20259] minor cleanup
1152 [ISC-Bugs #20263] add text describing some default values
1153 [ISC-Bugs #20193] single quotes at the start of a line indicate a control
1154 line to nroff, escape them if we actually want a quote.
1155 [ISC-Bugs #18916] sync the pointer to web pages amongst the different docs
1157 - 'get-host-names true;' now also works even if 'use-host-decl-names true;'
1158 was also configured. The nature of this repair also fixes another
1159 error; the host-name supplied by a client is no longer overridden by a
1160 reverse lookup of the lease address. Thanks to a patch from Wilco Baan
1161 Hofman supplied to us by the Debian package maintenance team.
1162 [ISC-Bugs #21691] {Debian Bug#509445}
1164 - The .TH tag for the dhcp-options manpage was typo repaired
1165 thanks to a report from jidanni and the Debian package maintenance
1166 team. [ISC-Bugs #21676] {Debian Bug#563613}
1168 - More documentation changes - primarily to put the options in the dhclient
1169 and dhcpd man pages into the standard form. Thanks in part to a patch
1170 from David Cantrell at Red Hat.
1171 [ISC-Bugs #20264] and parts of [ISC-Bugs #17744] dhclient.8 changes
1173 - Add code to clear the pointer to an object in an OMAPI handle when the
1174 object is freed due to a dereference. [ISC-Bugs #21306]
1176 - Fixed a bug that leaks host record references onto lease structures,
1177 causing the server to apply configuration intended for one host to any
1178 other innocent clients that come along later. [ISC-Bugs #22018]
1181 [ISC-Bugs #19566] When trying to find the zone for a name for ddns allow
1182 the name to be at the apex of the zone.
1183 [ISC-Bugs #19617] Restrict length of interface name read from command line
1184 in dhcpd - based on a patch from David Cantrell at Red Hat.
1185 [ISC-Bugs #20039] Correct some error messages in dhcpd.c
1186 [ISC-Bugs #20070] Better range check on values when creating a DHCID.
1187 [ISC-Bugs #20198] Avoid writing past the end of the field when adding
1188 overly long file or server names to a packet and add a log message
1189 if the configuration supplied overly long names for these fields.
1190 Thanks to Martin Pala.
1191 [ISC-Bugs #21497] Add a little more randomness to rng seed in client
1192 thanks to a patch from Jeremiah Jinno.
1194 - Correct error handling in DLPI [ISC-Bugs #20378]
1196 - Remove __sun__ and __hpux__ typedefs in osdep.h as they are now being
1197 checked in configure. [ISC-Bugs #20443]
1199 - Modify how the cmsg header is allocated the v6 send and received routines
1200 to compile on more compilers. [ISC-Bugs #20524]
1202 - When parsing a domain name free the memory for the name after we are
1203 done with it. [ISC-Bugs #20824]
1205 - Add an elapsed time option to the release message and refactor the
1206 code to move most of the common code to a single routine.
1209 - Two identical log messages for commit_leases() have been disambiguated.
1212 - Parse date strings more properly - the code now handles semi-colons in
1213 date strings correctly. Thanks to a patch from Jiri Popelka at Red Hat.
1214 [ISC-Bugs #21501, #20598]
1216 - Fixes to lease input and output.
1217 [ISC-Bugs #20418] - Some systems don't support the "%s" argument to
1218 strftime, paste together the same string using mktime instead.
1219 [ISC-Bugs #19596] - When parsing iaid values accept printable
1221 [ISC-Bugs #21585] - Always print time values in omshell as hex
1222 instead of ascii if the values happen to be printable characters.
1224 - Minor changes for scripts, configure.ac and Makefiles
1225 [ISC-Bugs #19147] Use domain-search instead of domain-name in manual and
1226 example conf file. Thanks to a patch from David Cantrell
1228 [ISC-Bugs #19761] Restore address when doing a rebind in DHCPv6
1229 [ISC-Bugs #19945] Properly close the quote on some arguments.
1230 [ISC-Bugs #20952] Add 64 bit types to configure.ac
1231 [ISC-Bugs #21308] Add "PATH=" to CLIENT_PATH environment variable
1233 - Update the code to parse dhcpv6 lease files to accept a semi-colon at
1234 the end of the max-life and preferred-life clauses. In order to be
1235 backwards compatible with older lease files not finding a semi-colon
1236 is also accepted. [ISC-Bugs #22303].
1238 ! Handle a relay forward message with an unspecified address in the
1239 link address field. Previously such a message would cause the
1240 server to crash. Thanks to a report from John Gibbins. [ISC-Bugs #21992]
1241 CERT: VU#102047 CVE: CVE-2010-3611
1243 - ./configure on longer searches for -lcrypto to explicitly link against.
1244 This fixes a bug where 'dhclient' would have shared library dependencies
1245 on '/usr/lib'. [ISC-Bugs #21967]
1247 - Handle pipe failures more gracefully. Some OSes pass a SIGPIPE
1248 signal to a process and will kill the process if the signal isn't
1249 caught. This patch adds code to turn off the SIGPIPE signal via
1250 a setsockopt() call. The signal is already being ignored as part
1251 of the ISC library. [ISC-Bugs #22269]
1253 - Restore printing of values in omshell to the style pre 21585. For
1254 21585 we changed the print routines to always display time values
1255 as a hex list. This had a side effect of printing all data strings
1256 as a hex list. We shall investigate other ways of displaying time
1257 values more usefully. [ISC-Bugs #22626]
1259 ! Fix the handling of connection requests on the failover port.
1260 Previously a connection request from a source that wasn't
1261 listed as a failover peer would cause the server to become
1262 non-responsive. Thanks to a report from Brad Bendily, brad@bendily.com.
1264 CERT: VU#159528 CVE: CVE-2010-3616
1266 - Don't pass the ISC_R_INPROGRESS status to the omapi signal handlers.
1267 Passing it through to the handlers caused the omshell program to fail
1268 to connect to the server. [ISC-Bugs #21839]
1270 - Fix the parenthesis in the code to process configuration statements
1271 beginning with "auth". The previous arrangement caused
1272 "auto-partner-down" to be processed incorrectly. [ISC-Bugs #21854]
1274 - Limit the timeout period allowed in the dispatch code to 2^^32-1 seconds.
1275 Thanks to a report from Jiri Popelka at Red Hat.
1276 [ISC-Bugs #22033], [Red Hat Bug #628258]
1278 - When processing the format flags for a given option consume the
1279 flag indicating an optional value correctly. A symptom of this
1280 bug was an infinite loop when trying to parse the slp-service-scope
1281 option. Thanks to a patch from Marius Tomaschewski.
1284 - Disable the use of kqueue in the ISC library. This avoids a problem
1285 between the fork and socket code that caused the dhcpd process to
1286 use all available cpu if the program daemonized itself.
1289 ! When processing a request in the DHCPv6 server code that specifies
1290 an address that is tagged as abandoned (meaning we received a
1291 decline request for it previously) don't attempt to move it from
1292 the inactive to active pool as doing so can result in the server
1293 crashing on an assert failure. Also retag the lease as active
1294 and reset its timeout value.
1297 - Removed the restriction on using IPv6 addresses in IPv4 mode. This
1298 allows IPv4 options which contain IPv6 addresses to be specified. For
1299 example the 6rd option can be specified and used like this:
1302 option 6rd code 212 = { integer 8, integer 8,
1303 ip6-address, array of ip-address };
1304 option 6rd 16 10 2001:: 1.2.3.4, 5.6.7.8;
1306 - Handle some DDNS corner cases better. Maintain the DDNS transaction
1307 information when updating a lease and cancel any existing transactions
1308 when removing the ddns information.
1311 - Some fixes for LDAP
1312 [ISC-Bugs #21783] - Include lber library when building ldap
1313 [ISC-Bugs #22888] - Enable the ldap code when buidling common
1314 The above fixes are from Jiri Popelka at Red Hat.
1316 - Modify the dlpi code to accept getmsg() returning a positive value.
1319 ! In dhclient check the data for some string options for
1320 reasonableness before passing it along to the script that
1321 interfaces with the OS.
1325 - DHCPv6 server now responds properly if client asks for a prefix that
1326 is already assigned to a different client. [ISC-Bugs #23948]
1328 - Add the option "--no-pid" to the client, relay and server code,
1329 to disable writing a pid file. Add the option "-pf pidfile"
1330 to the relay to allow the user to supply the pidfile name at
1331 runtime. Add the "with-relay6-pid-file" option to configure
1332 to allow the user to supply the pidfile name for the relay
1333 in v6 mode at configure time.
1334 [ISC-Bugs #23351] [ISC-Bugs #17541]
1336 - 'dhclient' no longer waits a random interval after first starting up to
1337 begin in the INIT state. This conforms to RFC 2131, but elects not to
1338 implement a 'SHOULD' direction in section 4.1. The goal of this change
1339 is to start up faster. [ISC-Bugs #19660]
1341 - Added 'initial-delay' parameter that specifies maximum amount of time
1342 before client goes to the INIT state. The default value is 0. In previous
1343 versions of the code client could wait up to 5 seconds. The old behavior
1344 may be restored by using 'initial-delay 5;' in the client config file.
1347 - ICMP ping-check should now sit closer to precisely the number of seconds
1348 configured (or default 1), due to making use of the new microsecond
1349 scale timer internally to dhcpd. This corrects a bug where the server
1350 may immediately timeout an ICMP ping-check if it was made late in the
1351 current second. [ISC-Bugs #19660]
1353 - The DHCP client will schedule renewal and rebinding events in
1354 microseconds if the DHCP server provided a lease-time that would result
1355 in sub-1-second timers. This corrects a bug where a 2-second or lower
1356 lease-time would cause the DHCP client to enter an infinite loop by
1357 scheduling renewal at zero seconds. [ISC-Bugs #19660]
1359 - Client lease records are recorded at most once every 15 seconds. This
1360 keeps the client from filling the lease database disk quickly on very small
1361 lease times. [ISC-Bugs #19660]
1363 - To defend against RFC 2131 non-compliant DHCP servers which fail to
1364 advertise a lease-time (either mangled, or zero in value) the DHCP
1365 client now adds the server to the reject list ACL and returns to INIT
1366 state to hopefully find an RFC 2131 compliant server (or retry in INIT
1367 forever). [ISC-Bugs #19660]
1369 - Parameters configured to evaluate from user defined function calls can
1370 now be correctly written to dhcpd.leases (as on 'on events' or dynamic
1371 host records inserted via OMAPI). [ISC-Bugs #22266]
1373 - If a 'next-server' parameter is configured in a dynamic host record via
1374 OMAPI as a domain name, the syntax written to disk is now correctly parsed
1375 upon restart. [ISC-Bugs #22266]
1377 - The DHCP server now responds to DHCPLEASEQUERY messages from agents using
1378 IP addresses not covered by a subnet in configuration. Whether or not to
1379 respond to such an agent is still governed by the 'allow leasequery;'
1380 configuration parameter, in the case of an agent not covered by a configured
1381 subnet the root configuration area is examined. Server now also returns
1382 vendor-class-id option, if client sent it. [ISC-Bugs #21094]
1384 - Documentation fixes
1385 [ISC-Bugs #17959] add text to AIX section describing how to have it send
1386 responses to the all-ones address.
1387 [ISC-Bugs #19615] update the includes in dhcpctl/dhcpctl.3 to be more correct
1388 [ISC-Bugs #20676] update dhcpd.conf.5 to include the RFC numbers for DDNS
1390 - Relay no longer crashes, when DHCP packet is received over interface without
1391 any IPv4 address assigned. Also extended logging message about discarding
1392 packets with invalid hlen with information about relevant interface name.
1395 - Relay now properly logs that packet was received over interface without
1396 global IPv6 address [ISC-Bugs #24070]
1398 - Linux Packet Filter interface improvement. sockaddr_pkt structure is used,
1399 rather than sockaddr. Packet ethertype is now forced to ETH_P_IP.
1402 - Minor code cleanups - but note port change for #23196
1403 [ISC-Bugs #23470] - Modify when an ignore return macro is defined to
1404 handle unsed error return warnings for more versions of gcc.
1405 [ISC-Bugs #23196] - Modify the reply handling in the server code to
1406 send to a specified port rather than to the source port for the incoming
1407 message. Sending to the source port was test code that should have
1408 been removed. The previous functionality may be restored by defining
1409 REPLY_TO_SOURCE_PORT in the includes/site.h file. We suggest you don't
1410 enable this except for testing purposes.
1411 [ISC-Bugs #22695] - Close a file descriptor in an error path.
1412 [ISC-Bugs #19368] - Tidy up variable types in validate_port.
1414 - Code cleanup: remove obsolete PROTO, KandR, INLINE and ANSI_DECL macros
1417 - Compilation problem with gcc4.5 and omshell.c resolved. [ISC-Bugs #23831]
1419 - Client Script fixes
1420 [ISC-Bugs #23045] Typos in client/scripts/openbsd
1421 [ISC-Bugs #23565] In the client scripts add a zone id (interface id) if
1422 the domain search address is link local.
1423 [ISC-Bugs #1277] In some of the client scripts add code to handle the
1424 case of the default router information being changed without the address
1427 - Documentation cleanup
1428 [ISC-Bugs #23326] Updated References document, several man page updates
1430 - Server no longer complains about NULL pointer when configured
1431 server-identifier expression fails to evaluate. [ISC-Bugs #24547]
1433 - Convert ISC_R_INPROGRESS status to ISC_R_SUCCESS when called from other
1434 than the dispatch handler. This fixes an issue where omshell, when
1435 run from the same platform as the server, would appear to fail to
1436 connect. This is a companion to #21839. [ISC-Bugs #23592]
1438 - Enlarge the buffer size used by the Omshell code and some of the
1439 print routines to allow for greater than 60 characters or, when
1440 printing as hex strings, 20 characters. [ISC-Bugs #22743]
1442 - In Solaris 11 switch to using sockets instead of DLPI, thanks
1443 to a patch form Oracle. [ISC-Bugs #24634].
1445 - Strict checks for content of domain-name DHCPv4 option can now be
1446 configured during compilation time. Even though RFC2132 does not allow
1447 to store more than one domain in domain-name option, such behavior is
1448 now enabled by default, but this may change some time in the future.
1449 See ACCEPT_LIST_IN_DOMAIN_NAME define in includes/site.h.
1452 - DNS Update fix. A misconfigured server could crash during DNS update
1453 processing if the configuration included overlapping pools or
1454 multiple fixed-address entries for a single address. This issue
1455 affected both IPv4 and IPv6. The fix allows a server to detect such
1456 conditions, provides the user with extra information and recommended
1457 steps to fix the problem. If the user enables the appropriate option
1458 in site.h then server will be terminated
1461 ! Two packets were found that cause a server to halt. The code
1462 has been updated to properly process or reject the packets as
1463 appropriate. Thanks to David Zych at University of Illinois
1464 for reporting this issue. [ISC-Bugs #24960]
1465 One CVE number for each class of packet.
1469 - Fix the code that checks for an existing DDNS transaction to cancel
1470 when removing DDNS information, so that we will continue with the
1471 processing if we have a lease even if it doesn't have an outstanding
1472 transaction. [ISC-Bugs #24682]
1474 - Add AM_MAINTAINER_MODE to configure.ac to avoid rebuilding
1475 configuration files. [ISC-Bugs #24107]
1477 - Add support for passing DDNS information to a DNS server over
1478 an IPv6 address. [ISC-Bugs #22647]
1480 - Enhanced patch for 23595 to handle IPv4 fixed addresses more
1481 cleanly. [ISC-Bugs #23595]
1483 ! Add a check for a null pointer before calling the regexec function.
1484 Without this check we could, under some circumstances, pass
1485 a null pointer to the regexec function causing it to segfault.
1486 Thanks to a report from BlueCat Networks.
1490 ! Modify the DDNS handling code. In a previous patch we added logging
1491 code to the DDNS handling. This code included a bug that caused it
1492 to attempt to dereference a NULL pointer and eventually segfault.
1493 While reviewing the code as we addressed this problem, we determined
1494 that some of the updates to the lease structures would not work as
1495 planned since the structures being updated were in the process of
1496 being freed: these updates were removed. In addition we removed an
1497 incorrect call to the DDNS removal function that could cause a failure
1498 during the removal of DDNS information from the DNS server.
1499 Thanks to Jasper Jongmans for reporting this issue.
1503 - Fixed the code that checks if an address the server is planning
1504 to hand out is in a reserved range. This would appear as
1505 the server being out of addresses in pools with particular ranges.
1508 - In the DDNS code handle error conditions more gracefully and add more
1509 logging code. The major change is to handle unexpected cancel events
1510 from the DNS client code.
1513 - Tidy up the receive calls and eliminate the need for found_pkt.
1516 - Add support for Infiniband over sockets to the server and
1517 relay code. We've tested this on Solaris and hope to expand
1518 support for Infiniband in the future. This patch also corrects
1519 some issues we found in the socket code.
1522 - Add a compile time check for the presence of the noreturn attribute
1523 and use it for log_fatal if it's available. This will help code
1524 checking programs to eliminate false positives.
1527 - Fixed many compilation problems ("set, but not used" warnings) for
1528 gcc 4.6 that may affect Ubuntu 11.10 users. [ISC-Bugs #27588]
1530 - Modify the code that determines if an outstanding DDNS request
1531 should be cancelled. This patch results in cancelling the
1532 outstanding request less often. It fixes the problem caused
1533 by a client doing a release where the TXT and PTR records
1534 weren't removed from the DNS.
1537 - Use offsetof() instead of sizeof() to get the sizes for dhcpv6_relay_packet
1538 and dhcpv6_packet in several more places. Thanks to a report from
1539 Bruno Verstuyft and Vincent Demaertelaere of Excentis.
1542 - Remove outdated note in the description of the bootp keyword about the
1543 option not satisfying the requirement of failover peers for denying
1544 dynamic bootp clients.
1547 - Multiple items to clean up IPv6 address processing.
1548 When processing an IA that we've seen check to see if the
1549 addresses are usable (not in use by somebody else) before
1551 When reading in leases from the file discard expired addresses.
1552 When picking an address for a client include the IA ID in
1553 addition to the client ID to generally pick different addresses
1555 [ISC-Bugs #23138] [ISC-Bugs #27945] [ISC-Bugs #25586]
1558 - Remove unnecessary checks in the lease query code and clean up
1559 several compiler issues (some dereferences of NULL and treating
1560 an int as a boolean).
1563 - Fix the NA and PD allocation code to handle the case where a client
1564 provides a preference and the server doesn't have any addresses or
1565 prefixes available. Previously the server ignored the request with
1566 this patch it replies with a NoAddrsAvail or NoPrefixAvail response.
1567 By default the code performs according to the errata of August 2010
1568 for RFC 3315 section 17.2.2; to enable the previous style see the
1569 section on RFC3315_PRE_ERRATA_2010_08 in includes/site.h. This option
1570 may be removed in the future.
1571 Thanks to Jiri Popelka at Red Hat for the patch.
1574 - Fix up some issues found by static analysis.
1575 A potential memory leak and NULL dereference in omapi.
1576 The use of a boolean test instead of a bitwise test in dst.
1579 - Rotate the lease file when running in v6 mode.
1580 Thanks to Christoph Moench-Tegeder at Astaro for the
1581 report and the first version of the patch.
1584 - Correct code to calculate timing values in client to compare
1585 rebind value to infinity instead of renew value.
1586 Thanks to Chenda Huang from H3C Technologies Co., Limited
1587 for reporting this issue.
1590 - Fix some issues in the code for parsing and printing options.
1591 [ISC-Bugs #22625] - properly print options that have several fields
1592 followed by an array of something for example "fIa"
1593 [ISC-Bugs #27289] - properly parse options in declarations that have
1594 several fields followed by an array of something for example "fIa"
1595 [ISC-Bugs #27296] - properly determine if we parsed a 16 or 32 bit
1596 value in evaluate_numeric_expression (extract-int).
1597 [ISC-Bugs #27314] - properly parse a zero length option from
1598 a lease file. Thanks to Marius Tomaschewski from SUSE for the report
1599 and prototype patch for this ticket as well as ticket 27289.
1601 ! Previously the server code was relaxed to allow packets with zero
1602 length client ids to be processed. Under some situations use of
1603 zero length client ids can cause the server to go into an infinite
1604 loop. As such ids are not valid according to RFC 2132 section 9.14
1605 the server no longer accepts them. Client ids with a length of 1
1606 are also invalid but the server still accepts them in order to
1607 minimize disruption. The restriction will likely be tightened in
1608 the future to disallow ids with a length of 1.
1609 Thanks to Markus Hietava of Codenomicon CROSS project for the
1610 finding this issue and CERT-FI for vulnerability coordination.
1614 ! When attempting to convert a DUID from a client id option
1615 into a hardware address handle unexpected client ids properly.
1616 Thanks to Markus Hietava of Codenomicon CROSS project for the
1617 finding this issue and CERT-FI for vulnerability coordination.
1621 ! A pair of memory leaks were found and fixed. Thanks to
1622 Glen Eustace of Massey University, New Zealand for finding
1627 - Existing legacy unit-tests have been migrated to Automated Test
1628 Framework (ATF). Several new tests have been developed. To enable
1629 unit-tests, please use --with-atf in configure script. A Developer's
1630 Guide has been added. To generate it, please use make devel in
1631 the doc directory. It is currently in early stages of development,
1632 but is expected to grow in the near future. [ISC-Bugs 25901]
1634 ! An issue with the use of lease times was found and fixed. Making
1635 certain changes to the end time of an IPv6 lease could cause the
1636 server to abort. Thanks to Glen Eustace of Massey University,
1637 New Zealand for finding this issue.
1641 - Update the memory leakage debug code to work with v6.
1644 - Relax the requirements for deleting an A or AAAA record.
1645 Previously the DDNS removal code required both the A or AAAA
1646 record and the TXT record to exist. This requirement could
1647 cause problems if something interrupted the removal leaving
1648 the TXT record alone. This relaxation was codified in RFC 4703.
1651 - Modify the failover code to handle incorrect peer names
1652 better. Previously the structure holding the name might
1653 have been freed inappropriately in some cases and not
1654 freed in other cases.
1657 - Add a configure option, enable-secs-byteorder, to deal with
1658 clients that do the byte ordering on the secs field incorrectly.
1659 This field should be in network byte order but some clients
1660 get it wrong. When this option is enabled the server will examine
1661 the secs field and if it looks wrong (high byte non zero and low
1662 byte zero) swap the bytes. The default is disabled. This option
1663 is only useful when doing load balancing within failover.
1666 - Fix a set of issues that were discovered via a code inspection
1667 tool. Thanks to Jiri Popelka and Tomas Hozza Red Hat for the logs
1671 - Parsing unquoted base64 strings improved. Parser now properly handles
1672 strings that contain reserved names. [ISC-Bugs #23048]
1674 - Modify the nak_lease function to make some attempts to find a
1675 server-identifier option to use for the NAK.
1678 - The client now passes information about the options it requested
1679 from the server to the script code via environment variables.
1680 These variables are of the form requested_<option_name>=1 with
1681 the option name being the same as used in the new_* and old_*
1685 - Add support for a simple check that the server id in a request message
1686 to a failover peer matches the server id of the server. This support
1687 is enabled by editing the file includes/site.h and uncommenting the
1688 definition for SERVER_ID_CHECK. The option has several restrictions
1689 and issues - please read the comment in the site.h file before
1693 - Tidy up some compiler issues in the debug code.
1696 - Move the dhcpd.conf example file to dhcpd.conf.example to avoid
1697 overwriting the dhcpd.conf file when installing a new version of
1698 ISC DHCP. The user will now need to manual copy and edit the
1699 dhcpd.conf file as desired.
1702 - Check the status value when trying to read from a connection to
1703 see if it may have been closed. If it appears closed don't try
1704 to read from it again. This avoids a potential busy-wait like
1705 loop when the peer names are mismatched.
1708 - Remove an unused variable to keep compilers happy.
1711 - Modify test makefiles to be more similar to standard makefiles
1712 and comment out a currently unused test.
1715 - Address static analysis warnings.
1716 [ISC-Bugs #33510] [ISC-Bugs #33511]
1718 - Silence benign static analysis warnings.
1721 - Add check for 64-bit package for atf.
1724 - Use newer auto* tool packages and turn on RFC_3542 support on Mac OS.
1727 - Remove a variable when it isn't being used due to #ifdefs to avoid
1728 a compiler warning on Solaris using GCC.
1731 - Add a check for too much whitespace in a config or lease file.
1732 Thanks to Paolo Pellegrino for finding the issue and a suggestion
1736 - Fix several problems with using OMAPI to manipulate class and subclass
1740 - Added a sleep call after killing the old client to allow time
1741 for the sockets to be cleaned. This should allow the -r option
1742 to work more consistently.
1745 - Missing files for ISC DHCP Developer's Guide are now included in
1746 the release tarballs. To generate this documentation, please use
1747 make devel command in doc directory. [ISC-Bugs #32767]
1749 - Update client script for use with openwrt.
1752 - Fix the socket handling for DHCPv6 clients to allow multiple instances
1753 of a client on a single machine to work properly. Previously only
1754 one client would receive the packets. Thanks to Jiri Popelka at Red Hat
1755 for the bug report and a potential patch.
1758 - Added support for gentle shutdown after signal is received.
1759 [ISC-Bugs #32692] [ISC-Bugs 34945]
1761 - Enhance the DHCPv6 server logging to include the addresses that are assigned
1765 - Fix an operation in the DDNS code to be a bitwise instead of logical or.
1769 Changes since 4.1.0 (new features)
1771 - Failover port configuration can now be left to defaults (port 647) as
1772 described in the -12 revision of the Failover draft (and assigned by
1773 IANA). Thanks in part to a patch from David Cantrell at Red Hat.
1775 - If configured, dhclient may now transmit to an anycast MAC address,
1776 rather than using a broadcast address. Thanks to a patch from David
1777 Cantrell at Red Hat.
1779 - Added client support for setting interface MTU and metric, thanks to
1780 Roy "UberLord" Marples <roy@marples.name>.
1782 - Added client -D option to specify DUID type to send.
1784 - A new failover configuration parameter has been introduced for those
1785 environments where DHCP servers can be reasonably guaranteed to be
1786 "down" when the failover TCP socket is severed, "auto-partner-down".
1787 This parameter is not generally safe, and by default is disabled, so
1788 please carefully review the documentation of this parameter in the
1789 dhcpd.conf(5) manpage before determining to use it yourself.
1791 - Added a configuration function, 'gethostname()', which calls the system
1792 function of the same name and presents the results as a data expression.
1793 This function can be used to incorporate the system level hostname of
1794 the system the DHCP software is operating on in responses or queries (such
1795 as including a failover partner's hostname in a dhcp message or binding
1796 scope, or having a DHCP client send any system hostname in the host-name or
1797 FQDN options by default).
1799 - The dhcp-renewal-time and dhcp-rebinding-time options may now be configured
1800 for DHCPv4 operation and used independently of the dhcp-lease-time
1801 calculations. Invalid renew and rebinding times (e.g., greater than the
1802 determined lease time) are omitted.
1804 - Processing the DHCP to DNS server transactions in an asynchronous fashion,
1805 the DHCP server or client can now continue with its processing while
1806 awaiting replies from the DNS server.
1808 - The 'hardware [ethernet|etc] ...;' parameter in host records has been
1809 extended to attempt to match DHCPv6 clients by the last octets of a
1810 DUID-LL or DUID-LLT provided by the client.
1812 Changes since 4.1.0 (bug fixes)
1814 - Remove infinite loop in token_print_indent_concat().
1816 - Validate the argument to the -p option.
1818 - The notorious 'option <unknown> ... larger than buffer' log line,
1819 which is seen in some malformed DHCP client packets, was modified.
1820 It now logs the universe name, and does not log the length values
1821 (which are bogus corruption read from the packet anyway). It also
1822 carries a hopefully more useful explanation.
1824 - Suppress spurious warnings from configure about --datarootdir
1826 - A bug was fixed that caused the server not to answer some valid Solicit
1827 and Request packets, if the dynamic range covering any requested addresses
1828 had been deleted from configuration.
1830 - Update the code to deal with GCC 4.3. This included two sets of changes.
1831 The first is to the configuration files to include the use of
1832 AC_USE_SYSTEM_EXTENSIONS. The second is to deal with return values that
1835 - The db-time-format option was documented in manpages.
1837 - Using reserved leases no longer results in 'lease with binding state
1838 free not on its queue' error messages, thanks to a patch from Frode
1841 - Fix a build error in dhcrelay, using older versions of gcc with
1844 - Two uninitialized stack structures are now memset to zero, thanks to a
1845 patch from David Cantrell at Red Hat.
1847 - Fixed a cosmetic bug where pretty-printing valid domain-search options would
1848 result in an erroneous error log message ('garbage in format string').
1850 - A bug in DLPI packet transmission (Solaris, HP/UX) that caused the server
1851 to stop receiving packets is fixed. The same fix also means that the MAC
1852 address will no longer appear 'bogus' on DLPI-based systems.
1854 - A bug in select handling was discovered where the results of one select()
1855 call were discarded, causing the server to process the next select() call
1856 and use more system calls than required. This has been repaired - the
1857 sockets will be handled after the first return from select(), resulting in
1860 - The update-conflict-detection feature would leave an FQDN updated without
1861 a DHCID (still currently implemented as a TXT RR). This would cause later
1862 expiration or release events to fail to remove the domain name. The feature
1863 now also inserts the client's up to date DHCID record, so records may safely
1864 be removed at expiration or release time. Thanks to a patch submitted by
1867 - Memory leak in the load_balance_mine() function is fixed. This would
1868 leak ~20-30 octets per DHCPDISCOVER packet while failover was in use
1869 and in normal state.
1871 - Various compilation fixes have been included for the memory related
1872 DEBUG #defines in includes/site.h.
1874 - Fixed Linux client script 'unary operator expected' errors with DHCPv6.
1876 - Fixed setting hostname in Linux hosts that require hostname argument
1877 to be double-quoted. Also allow server-provided hostname to
1878 override hostnames 'localhost' and '(none)'.
1880 - Fixed failover reconnection retry code to continue to retry to reconnect
1881 rather than restarting the listener.
1883 - Compilation on Solaris with USE_SOCKETS defined in includes/site.h has
1884 been repaired. Other USE_ overrides should work better.
1886 - A check for the local flavor of IFNAMSIZ had a broken 'else' condition,
1887 that probably still resulted in the correct behaviour (but wouldn't use
1888 a larger defined value provided by the host OS).
1890 - Fixed a bug where an OMAPI socket disconnection message would not result
1891 in scheduling a failover reconnection, if the link had not negotiated a
1892 failover connect yet (e.g.: connection refused, asynch socket connect()
1895 - A bug was fixed that caused the 'conflict-done' state to fail to be parsed
1896 in failover state records.
1898 ! A stack overflow vulnerability was fixed in dhclient that could allow
1899 remote attackers to execute arbitrary commands as root on the system,
1900 or simply terminate the client, by providing an over-long subnet-mask
1901 option. CERT VU#410676 - CVE-2009-0692
1903 - Fixed a bug where relay agent options would never be returned when
1904 processing a DHCPINFORM.
1906 - Versions 3.0.x syntax with multiple name->code option definitions is now
1907 supported. Note that, similarly to 3.0.x, for by-code lookups only the
1908 last option definition is used.
1910 - Fixed a bug where a time difference of greater than 60 seconds between a
1911 failover pair could cause the primary to crash on contact with the
1912 secondary. Thanks to a patch from Steinar Haug.
1914 - Don't look for IPv6 interfaces on Linux when running in DHCPv4 mode.
1915 Thanks to patches from Matthew Newton and David Cantrell.
1917 - Secondary servers in a failover pair will now perform ddns removals if
1918 they had performed ddns updates on a lease that is expiring, or was
1919 released through the primary. As part of the same fix, stale binding scopes
1920 will now be removed if a change in identity of a lease's active client is
1921 detected, rather than simply if a lease is noticed to have expired (which it
1922 may have expired without a failover server noticing in some situations).
1924 - A patch supplied by David Cantrell at RedHat was applied that detects
1925 invalid calling parameters given to the ns_name_ntop() function.
1926 Specifically, it detects if the caller passed a pointer and size pair
1927 that causes the pointer to integer-wrap past zero.
1929 ! Fixed a fenceposting bug when a client had two host records configured,
1930 one using 'uid' and the other using 'hardware ethernet'. CVE-2009-1892
1932 - Fixed the check in the dhcp_interface_signal_handler routine to verify
1933 the existence of the linked signal handler before calling it.
1935 - Both host and subnet6 configuration groups are now included whether a
1936 fixed-address6 (DHCPv6) is in use or not. Host scoped configuration takes
1937 precedence. This fixes two bugs, one where host scoped configuration
1938 would not be included from a non-fixed-address6 host record, and the equal
1939 and opposite bug where subnet6 scoped configuration would not be used when
1940 over-riding values were not present in a matching fixed-address6 host
1943 - ./configure now checks to ensure the intX_t and u_intX_t types are defined,
1944 correcting a compilation failure when using Sun's compiler.
1946 - Modified the handling of a connection to avoid releasing the omapi io
1947 object for the connection while it is still in use. One symptom from
1948 this error was a segfault when a failover secondary attempted to connect
1949 to the failover primary if their clocks were not synchronized.
1951 - Clean up to allow compilation with gcc 2.95.4 on FreeBSD. Remove an
1952 extra semi-colon from common/dns.c and moved setting a variable to NULL
1953 in server/dhcpv6.c to allow the compiler to decide that the variable
1954 was always properly set.
1956 Changes since 4.1.0b1
1958 - A missing "else" in dhcrelay.c could have caused an interface not to
1961 Changes since 4.1.0a2
1963 - A cosmetic bug in DHCPDECLINE processing was fixed which caused all
1964 successful DHCPDECLINEs to be logged as "not found" rather than
1967 - Added configuration file examples for DHCPv6.
1969 - Some failover debugging #defines have been better defined and some
1970 high frequency messages moved to a deeper debugging symbol.
1972 - The CLTT parameter in failover is now only updated by client activity,
1973 and not by failover binding updates (taking on the peer's CLTT).
1975 - Failover BNDUPD messages are now discarded if they conflict with an
1976 update that has been transmitted, but not acknowledged.
1978 - A bug cleaning up unknown-xxx temporary option definitions was fixed.
1980 - Delayed-ack is now a compile-time option, compiled out by default.
1981 This feature is simply too experimental for right now, and causes
1982 some problems to some failover installations. We will revisit this
1985 - The !inet_pton() call in res_mkupdrec was adjusted to '<= 0' as
1986 inet_pton returns either 1, 0, or -1.
1988 - A dhclient-script for MacOS X has been included, which enables
1989 'dhclient -6' support.
1991 - DDNS removal routines were updated so that the DHCID is not removed until
1992 the client has been deprived of all A and AAAA records (not only the last
1993 one of either of those). This resolves a bug where dual stack clients
1994 would not be able to regain their names after either expiration event.
1996 Changes since 4.1.0a1
1998 - Corrected list of failover state values in dhcpd man page.
2000 - Fixed a bug that caused some request types to be logged incorrectly.
2002 - Clients that sent a parameter request list containing the
2003 routers option before the subnet mask option were receiving
2004 only the latter. Fixed.
2006 - The server wasn't always sending the FQDN option when it should.
2008 - A partner-down failover server no longer emits 'peer holds all free leases'
2009 if it is able to newly-allocate one of the peer's leases.
2011 - Fixed a coredump when adding a class via OMAPI.
2013 - Check whether files are zero length before trying to parse them.
2015 - Ari Edelkind's PARANOIA patch has been included and may be compiled in
2016 via two ./configure parameters, --enable-paranoia and
2017 --enable-early-chroot.
2019 - ./configure was extended to cover many optional build features, such
2020 as failover, server tracing, debugging, and the execute() command.
2022 - There is now a default 1/4 of a second scheduled delay between delayed
2023 fsync()'s, it can be configured by the max-ack-delay configuration
2026 - A bug was fixed where the length of a hostname was miscalculated, so that
2027 hosts were given odd-looking domain names ("foo.bar.ba.example.com").
2029 - Shared network selection should be done from the innermost relay
2030 valid link-address field, rather than the outermost.
2032 - Prefix pools are attached to shared network scopes.
2034 - Merged IA_XX related structures.
2036 - Add DHCPv6 files in configure.
2038 - A memory leak when using omapi has been fixed.
2040 - DHCPv6 vendor-class options (VSIO) are now only sent when they appear
2041 on the DHCPv6 ORO. This resolves a bug where VSIO options were placed
2042 in IA_NA encapsulated options fields.
2044 - Integrated client with stateless, temporary address and prefix delegation
2047 - A double-dereference in dhclient transmission of DHCPDECLINEs was
2050 - Fix handling of format code 'Z'.
2052 - Support "-1" argument in DHCPv6.
2054 - Merge DHCPv6-only "dhcrelay6" into general-purpose "dhcrelay" (use
2055 "-6" option to select DHCPv6 mode).
2057 - Fix handling of -A and -a flags in dhcrelay; it was failing to expand
2058 packet size as needed to add relay agent options.
2060 - A bug in subnet6 parsing where options contained in subnet6 clauses would
2061 not be applied to clients addressed within that network was repaired.
2063 - When configuring a "subnet {}" or "subnet6 {}" without an explicit
2064 shared-network enclosing it, the DHCP software would synthesize a
2065 shared-network to contain the subnet. However, all configuration
2066 parameters within the subnet more intuitively belong "to any client
2067 on that interface", or rather the synthesized shared-network. So,
2068 when a shared-network is synthesized, it is used to contain the
2069 configuration present inside the subnet {} clause. This means that
2070 the configuration will be valid for all clients on that network, not
2071 just those addressed out of the stated subnet. If you intended the
2072 opposite, the workaround is to explicitly configure an empty
2075 - A bug was fixed where Information-Request processing was not sourcing
2076 configured option values.
2078 - A warning was added since the DHCPv6 processing software does not yet
2079 support class statements.
2081 - Compilation warnings on GCC 4.3 relating to bootp source address
2082 selection were repaired.
2084 - The v6 BSD socket method was updated to use a single UDP BSD socket
2085 no matter how many interfaces are involved, differentiating the
2086 interfaces the packets were received on by the interface index supplied
2089 - The relay agent no longer listens to the All DHCP Servers Multicast
2092 - A bug was fixed in data_string_sprintfa() where va_start was only called
2093 once for two invocations of vsprintf() variants.
2095 - ERO (RFC 4994) server support.
2097 - Basic and partial DHCPv6 leasequery support.
2099 - Reliable DHCPv6 release (previous behavior, send release and exit, is
2100 still available with dhclient -6 -1 -r).
2102 Changes since 4.0.0 (new features)
2104 - Added DHCPv6 rapid commit support.
2106 - Added explicit parser support for zero-length DHCP options, such as
2107 rapid-commit, via format code 'Z'.
2109 - It's now possible to update the "ends" field of a lease with OMAPI.
2110 This is useful if you want not only to release a lease, but also make
2111 it available for reuse right away. Hat tip to Christof Chen.
2113 - Fixed definition of the iaaddr hash functions to use the correct
2114 functions when referencing and dereferencing memory.
2116 - Some definitions not in phase with the IANA registry were updated.
2118 - Allocated interface IDs are better controlled ('u' bit set to zero,
2119 reserved IDs avoided).
2121 - Unicast options are taken into account only for RENEWs.
2123 - NoAddrsAvail answers to SOLICITs are always ADVERTISEs even when a SOLICIT
2124 carries a rapid-commit option.
2126 - Return in place of raise an impossible condition when one tries to release
2127 an empty active lease.
2129 - Timer granularity is now 1/100s in the DHCPv6 client.
2131 - The dhclient-script was updated to create a host route for the default
2132 gateway if the supplied subnet mask for an IPv4 address was a /32. This
2133 allows the client to work in 'captive' network environments, where the
2134 operator does not want clients to crosstalk directly.
2136 - MINUS tokens should be parsable again.
2138 - Multiple (up to "delayed-ack x;" maximum) DHCPv4 packets are now queued and
2139 released in bursts after single fsync() events when the upper limit is
2140 reached or if the receiving sockets go dry. The practical upshot is
2141 that fsync-coupled server performance is now multiplicitively increased.
2142 The default delayed ack limit is 28. Thanks entirely to a patch from
2145 Changes since 4.0.0 (bug fixes)
2147 - DHCP now builds on AIX.
2149 - Exit with warning when DHCPv6-specific statements are used in the
2150 config file but -6 is not specified.
2152 - Fixed "--version" flag in dhcrelay
2154 - The 'min-secs' configuration parameter's log message has been updated to
2157 - The warning logged when an address range doesn't fit in the subnets
2158 they were declared has been updated to be more helpful and identify the
2159 typo in configuration that created the spanning addresses.
2161 - A bug in failover pool rebalancing that caused POOLREQ message ping-pongs
2164 - A flaw in failover pool rebalancing that could cause POOLREQ messages to
2165 be sent outside of the min-balance/max-balance scheduled intervals has
2168 - A cosmetic bug during potential-conflict recovery that caused the peer's
2169 'conflict-done' state message to be logged as 'unknown-state' has been
2170 repaired. It is now logged correctly.
2172 - A bug was fixed where the 'giaddr' may be used to find the client's subnet
2173 rather than its own 'ciaddr'.
2175 - A log message was introduced to clarify the situation where a failover
2176 'address' parameter (the server's local address) did not resolve to an
2179 - The minimum site code value was set to 224 in 3.1.0 to track RFC3942. This
2180 broke a lot of legacy site local configurations. The new code in place will
2181 track site local space minimum option codes and logs a warning to encourage
2182 updates and exploration of site local code migration problems. Option
2183 codes less than 128 in site local spaces remain inaccessible.
2185 - A possible relay agent option bug was repaired where random server
2186 initialization state may have been used to signal the relay agent
2187 information options sub-option code for the 'END' of the option space.
2189 - Fixes to allow code to compile and run on Solaris 9.
2191 - Fixes to allow code to compile on Mac OS X Leopard (10.5).
2193 - When server is configured with options that it overrides, a warning is
2194 issued when the configuration file is read, rather than at the time the
2195 option is overridden. This was important, because the warning was given
2196 every time the option was overridden, which could create a lot of
2197 unnecessary logging.
2199 - Fixed a compilation problems on platforms that define a value for FDDI,
2200 which conflicts with a dhcp configuration syntax token by the same name.
2202 - When a failover server suspects it has encountered a peer running a
2203 version 3.0.x failover server, a warning that the failover wire protocol
2204 is incompatible is printed.
2206 - The failover server no longer issues a floating point error if it encounters
2207 a previously undefined option code.
2209 - Fix startup error messages to report a missing "subnet6 declaration", rather
2210 than a missing "subnet declaration", when running as a DHCPv6 server.
2212 - DHCPv6 client timestamp in DUID was based on the year 1970 rather
2215 - Warn when attempting to use a hardware parameter in DHCPv6.
2217 - DHCPv6 released resources are now marked as released by the client.
2219 - 'Soft' bindings have no more side-effects.
2221 Changes since 4.0.0b3
2223 - The reverse dns name for PTR updates on IPv6 addresses has been fixed to
2224 use ip6.arpa. rather than default to in-addr.arpa and require user
2227 - dhc6_lease_destroy() and dhc6_ia_destroy() now set lease and IA pointers
2228 to NULL after freeing, to prevent subsequent accesses to freed memory.
2230 - The DHCPv6 server would not send the preference option unless the
2231 client requested it, via the ORO. This has been fixed, so the DHCPv6
2232 server will always send the preference value if it is configured.
2234 - When addresses were passed as hints to the server in an IA, they were
2235 incorrectly handled, sometimes being treated as an error. Now the
2236 server will treat these as hints and ignore them if it cannot supply
2237 a requested address.
2239 - If the client had multiple addresses, and one expired (was not renewed
2240 by the server), the client would continue to attempt to renew the same
2241 old address over and over. Now, the client will omit any expired
2242 addresses from future Confirm, Renew, or Rebind messages.
2244 - dhclient -6 will now select renew/rebind timers based upon the longest
2245 address expiration time rather than the shortest expiration time, in
2246 order to avoid cascading renewals in the event a server elects not to
2247 extend one of multiple IAADDR leases.
2249 - The server now limits clients that request multiple addresses to one
2250 address per IA by default, which can be adjusted through the
2251 "limit-addrs-per-ia" configuration option.
2253 - The DHCPv6 client now issues fresh transaction IDs on Renew and Rebind
2254 message exchanges, rather than using the most recent ID.
2256 - The DHCPv6 server now replies to Information-Request messages.
2258 - A bug was fixed in the dhclient-script for BSDs to correctly carry error
2259 codes through some conditions.
2261 - The parsing of some options in the dhclient lease file, in particular
2262 the success DHCPv6 status-code, was fixed.
2264 - A bug was fixed that caused the DHCPv6 ORO option to be corrupted with
2265 seemingly random values.
2267 - A reference overleak in DHCPv6 shared network processing was repaired.
2269 - ./configure now autodetects local database locations rather than trying
2270 to put dhcpd.leases and dhclient.leases in /usr/local/var/db, which no
2273 - Regression fix for bug where server advertised a IPv6 address in
2274 response to a SOLICIT but would not return the address in response
2277 - A bug was fixed where the DHCPv6 server puts the NoAddrsAvail status
2278 code in the IA_NA was fixed. The status code now appears in the root
2281 Changes since 4.0.0b2
2283 - Clarified error message when lease limit exceeded
2285 - Relative time may now be used as a qualifier for 'allow' and 'deny' access
2286 control lists. These directives may be used to assist in re-addressing
2287 address pools without having to constantly reconfigure the server. Please
2288 see 'man dhcpd.conf' for more information on allow/deny 'after time' syntax.
2289 Thanks to a patch from Christof Chen.
2291 - The server will now include multiple IA_NA's and multiple IAADDRs within
2292 them, if advertised by the client. It still only seeks to allocate one
2295 Changes since 4.0.0b1
2297 - Use different paths for PID and lease files when running in DHCPv4
2298 or DHCPv6 mode, so that servers for both protocols can be run
2299 simultaneously on a single interface.
2301 - Fixed a buffer overflow error which could have allowed a denial
2302 of service under unusual server configurations
2304 - Eliminated a spurious error message from the client
2306 - A number of bugs with the internal handling of lease state on the
2307 server have been fixed. Some of these could cause server crashes.
2309 - The peer_wants_leases() changes pulled up from 3.1.0 were corrected,
2310 'never used' leases will no longer consistently shift between servers
2311 on every pool rebalance run.
2313 - sendmsg()/recvmsg() control buffers are now declared in such a way to
2314 ensure they are correctly aligned on all (esp. 64-bit) architectures.
2316 - The client leasing subsystem was streamlined and corrected to account
2317 more closely for changes in client link attachment selection.
2319 Changes since 4.0.0a3
2321 - The DHCP server no longer requires a "ddns-update-style" statement,
2322 and now defaults to "none", which means DNS updates are disabled.
2324 - Log messages when failover peer names mismatch have been improved to
2325 point out the problem.
2327 - Bug where server advertised a IPv6 address in response to a SOLICIT
2328 but would not return the address in response to a REQUEST. Thanks to
2329 Dennis Kou for finding the bug.
2331 - Fixed an error causing the server to lock up on lease expiration,
2332 reported independently by Jothilingam Vasu and Dennis Kou.
2334 - Fixed a ./configure bug where compile tests were failing due to
2335 "-Werror" (unused variable) rather than the actual test failure. Lead
2336 to inconsistent and unworkable auto-configurations.
2338 - Compilation with DLPI and -Werror has been repaired.
2340 - Error in decoding IA_NA option if multiple interfaces are present
2341 fixed by Marcus Goller.
2343 - DHCPv6 server Confirm message processing has been enhanced - it no
2344 longer replies only to clients with host {} records, it now replies
2345 as directed in RFC3315 section 18.2.2 - that is, to all clients
2346 regardless of the existence of bindings.
2348 - A core dump during expired lease cleanup has been repaired.
2350 - DDNS updates state information are now stored in 'binding scopes' that
2351 follow the leases through their lifecycles. This enables DDNS teardowns
2352 on leases that are assigned and expired inbetween a server restart (the
2353 state is recovered from dhcpd.leases). Arbitrary user-specified binding
2354 scopes ('set var = "value";') are not yet supported.
2356 - Additional compilation problems on HP/UX have been repaired.
2358 Changes since 4.0.0a2
2360 - Fix for startup where there are no IPv4 addresses on an interface.
2361 Thanks to Marcus Goller for reporting the bug.
2363 - Fixed file descriptor leak on listen failure. Thanks to Tom Clark.
2365 - Bug in server configuration parser caused server to get stuck on
2366 startup for certain bad pool declarations. Thanks to Guillaume
2367 Knispel for the bug report and fix.
2369 - Code cleaned to remove warnings reported by "gcc -Wall".
2371 - DHCPv6 is now the default. You can disable DHCPv6 support using the
2372 "--disable-dhcpv6" flag when you run the configure script.
2374 - An internal database inconsistency bug was repaired where the server
2375 would segfault if a client attempted to renew a lease that had been
2376 loaded from persistent storage.
2378 - 'request' and 'also request' syntaxes have been added to accommodate
2379 the DHCPv6 client configuration. 'send dhcp6.oro' is no longer
2382 - Bug fixed where configuration file parsing did not work with
2383 zero-length options; this made it impossible to set the
2384 rapid-commit option.
2386 - Bogus messages about host records with IPv4 fixed-addresses being of
2387 non-128-bits in length were removed.
2389 Changes since 4.0.0a1
2391 - Bug in octal parsing fixed. Thanks to Bernd Fuhrmann for the report
2394 - Autoconf now supplies proper flags for Solaris DHCPv6 builds.
2396 - Fix for parsing error on some IPv6 addresses.
2398 - Invalid CIDR representation for IPv6 subnets or ranges now checked
2399 for when loading configuration.
2401 - Compilation on HP/UX has been repaired. The changes should generally
2402 apply to any architecture that supplies SIOCGLIFCONF but does not
2403 use 'struct lifconf' structures to pass values.
2405 - Two new operators, ~= and ~~, have been integrated to implement
2406 boolean matches by regular expression (such as may be used in
2407 class matching statements). Thanks to a patch by Alexandr S.
2408 Agranovsky, which underwent slight modification.
2410 - Fix for icmp packets on 64-bit systems (bug introduced in 4.0).
2412 - A bug was fixed in interface discovery wherein an error identifying
2413 a server-configured interface with no IPv4 addresses would SEGV.
2415 - Fixed a bug in which write_lease() might report a failure incorrectly
2417 - Added support for DHCPv6 Release messages
2419 - Added -x option to dhclient, which triggers dhclient processes
2420 to exit gracefully without releasing leases first
2422 - All binaries (client, server, relay) now change directories
2423 to / before going into daemon mode, so as not to hold $CWD open
2425 - Fixed a bug parsing DHCPv6 client-id's in host-identifier statements
2427 - Fixed a bug with the 'ddns-updates' boolean server configuration
2428 parameter, which caused the server to fail.
2430 Changes since 4.0.0-20070413
2432 - Old (expired) leases are now cleaned.
2434 - IPv6 subnets now have support for arbitrary allocation ranges via
2435 a new 'range6' configuration directive.
2437 - An obviated option code hash lookup to find D6O_CLIENTID was removed.
2439 - Corrected some situations where variables might be used without being
2442 - Silenced several other compiler warnings.
2444 - Include the more standard sys/uio.h rather than rely upon other
2445 header files to include it (fixes a BSD 4.2 compile failure).
2447 - Duplicate dhclient-script updates for DHCPv6 to all provided scripts.
2449 - DHCPv4 I/O methods that failed to sense hardware address were corrected.
2451 - DHCPv4 is now the default (as documented) rather than DHCPv6. The default
2452 was set to DHCPv6 to facilitate ease early development, and forgotten.
2454 - Corrected a segmentation violation in DHCPv4 socket processing.
2456 - dhclient will now fork() into the background once it binds to an
2457 IPv6 address, or immediately if the -n flag is supplied.
2459 - -q is now the default behaviour on dhclient, with -d or -v enabling
2460 non-quiet (stderr logging) mode.
2462 - Fix documentation of the domain-search atom (quoted, with commas).
2464 - Document DHCPv6 options presently in the default table.
2466 - Replaced ./configure shellscripting with GNU Autoconf.
2468 Changes since 3.1.0 (NEW FEATURES)
2470 - DHCPv6 Client and Server protocol support. Use '-6' to run the daemons
2471 as v6-only. Use '-4' to run the daemons as v4-only (default. There is
2472 no support currently for both.
2474 - Server support for multiple IA_NA options, containing at most one
2477 - Client support for one IA_NA option, containing any number of IAADDR
2480 - Server support for the DHCPv6 Information-request message.
2482 - Inappropriate unicast DHCPv6 messages sent to the server are now
2483 discarded, and this has rearchitected the IO system slightly.
2485 - The DHCPv6 server DUID defaults to type 1, is persistently stored in
2486 the leases database, and can be over-ridden (either completely, or by
2487 specifying type 1 or type 2).
2489 - The server only uses Rapid-Commit if it has been configured with the
2490 Rapid-Commit option and the client requests it.
2492 - DDNS support. We now update AAAA records in the same place we would
2493 update A records, if we have an IPv6 address. We also generate IP6.ARPA
2494 style names for PTR records if we're dealing with an IPv6 address. Both
2495 A and AAAA updates are done using the same 'fqdn.' virtual option space
2496 (although the DHCPv4 FQDN and DHCPv6 FQDN options are formatted
2497 differently, they both use the same code here).
2499 - The Linux dhclient-script attempts to set and remove assigned addresses,
2500 and to configure /etc/resolv.conf from nameserver and domain name
2501 configurations. It can be extended to configure other parameters.
2503 - Initial DHCPv6 lease support.
2505 - The IO system now tracks all local IP addresses, so that the DHCP
2506 applications (particularly the dhcrelay) can discern between what frames
2507 were transmitted to it, and what frames are being carried through it which
2508 it should not intercept.
2510 Changes since 3.1.0 (Maintenance)
2512 - A bug was repaired where MAC Address Affinity for virgin leases always
2513 mapped to the primary. Virgin leases now have an interleaved preference
2514 between primary and secondary.
2516 - A bug was repaired where MAC Address Affinity for clients with no client
2517 identifier was sometimes mishashed to the peer. Load balancing during
2518 runtime and pool rebalancing were opposing.
2520 - An assertion in lease counting relating to reserved leases was repaired.
2522 - The subnet-mask option inclusion now conforms with RFC2132 section 3.3;
2523 it will only appear prior to the routers option if it is present on the
2524 Parameter-Request-List. The subnet-mask option will also only be
2525 included by default (if it is not on the PRL) in response to DISCOVER
2526 or REQUEST messages.
2528 - The FQDN option is only supplied if the client supplied an FQDN option or
2529 if the FQDN option was explicitly requested on the PRL.
2531 - Dynamic BOOTP leases are now load balanced in failover.
2533 Changes since 3.1.0rc1
2535 - The parse warning that 'deny dynamic bootp;' must be configured for
2536 failover protected subnets was removed.
2538 Changes since 3.1.0b2
2540 - Failover rebalance events no longer play ping pong with round errors
2541 (moving leases between free and back to backup where there are an
2542 odd number of leases).
2544 - The 'pool' log line has been split into two messages, one before the
2545 rebalance run, and one after.
2547 - Any queued BNDACKs are transmitted before transmitting new BNDUPDs.
2548 This enforces the correct sequence of events for the remote server
2549 processing these messages.
2551 Changes since 3.1.0b1
2553 - Fixed a bug that caused OMAPI clients to freeze when opening lease
2556 - A new server config option "fqdn-reply" specifies whether the server
2557 should send out option 81 (FQDN). Defaults to "on". If set to "off",
2558 the FQDN option is not sent, even if the client requested it. This is
2559 needed because some clients misbehave otherwise. Thanks to Christof Chen
2562 - Allow trace output files (-tf option) to be overwritten, rather than
2563 crashing dhcpd if the file already exists
2565 - A bug was fixed that caused dhcpd to segfault if a pool was declared
2566 outside the scope of a subnet in dhcpd.conf.
2568 - Some uninitialized values were repaired in dhcpleasequery.c that
2569 caused the server to abort.
2571 - A new server config option, 'do-reverse-updates', has been added
2572 which causes the server to abstain from performing updates on PTR
2573 records. Thanks to a patch from Christof Chen at Allianz.
2575 - A bug was repaired in subencapsulation support, where spaces separated
2576 by empty spaces would not get included.
2578 - A bug in dhclient was repaired which caused it to send parameter request
2579 lists of 55 bytes in length no matter how long the declared PRL was.
2581 - 'dhcp.c(3953): non-null pointer' has been repaired. This fixes a flaw
2582 wherein the DHCPv4 server may ignore a configured server-identifier.
2584 - A flaw in failover startup sequences was repaired that sometimes left
2585 the primary DHCP server's pool rebalance schedules unscheduled.
2587 - Corrected a flaw that broke encapsulated spaces included due to presence
2588 on the parameter request list.
2590 Changes since 3.1.0a3
2592 - Some spelling fixes.
2594 Changes since 3.1.0a2
2596 - A bug was fixed where attempting to permit leasequeries results in a
2597 fatal internal error, "Unable to find server option 49".
2599 - A bug was fixed in dhclient rendering the textual output form of the
2600 domain-search option syntax.
2602 Changes since 3.1.0a1
2604 - A bug in the FQDN universe that added FQDN codes to the NWIP universe's
2605 hash table was repaired.
2607 - The servers now try harder to transmit pending binding updates when
2608 entering normal state.
2610 - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
2611 requeues all pending updates. This should reduce the number of spurious
2612 'xid mismatch' log messages.
2614 - An option definition referencing leak was fixed, which resulted in early
2615 termination of dhclient upon the renewal event.
2617 - Some default hash table sizes were tweaked, some upwards, some downwards.
2618 3.1.0a1's tables resulted in a reduction in default server memory use.
2619 The new selected values provide more of a zero sum (increasing the size
2620 of tables likely to be populated, decreasing the size of tables unlikely).
2622 - Lease structures appear in three separate hashes: by IP address, by UID,
2623 and by hardware address. One type of table was used for all three, and
2624 improvements to IP address hashing were applied to all three (so UID and
2625 hardware addresses were treated like 4-byte integers). There are now two
2626 types of tables, and the uid/hw hashes use functions more appropriate
2629 - The max-lease-misbalance percentage no longer causes scheduled rebalance
2630 runs to be skipped: it still governs the schedule, but every scheduled
2631 run will attempt balance.
2633 - A segfault bug in recursive encapsulation support has been corrected.
2635 Changes since 3.0 (New Features)
2637 - A workaround for certain STSN servers that send a mangled domain-name
2638 option was introduced for dhclient. The client will now accept corrupted
2639 server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
2640 or NAK). The server will continue to not accept corrupt client packets.
2642 - Support for 'reserved' (pseudo-static) and BOOTP leases via failover
2645 - Support for adding, removing, and managing class and subclass statements
2648 - The failover implementation was updated to comply with revision 12 of
2651 - 'make install' now creates the initial zero-length dhcpd.leases file if
2652 one does not already exist on the system.
2654 - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
2656 - The Load Balance Algorithm was misimplemented. The current implementation
2659 - lcase() and ucase() configuration expressions have been added which adjust
2660 their arguments from upper to lower and lower to upper cases respectively.
2661 Thanks to a patch from Albert Herranz.
2663 - The dhclient 'reject ...;' statement, which rejects leases given by named
2664 server-identifiers, now permits address ranges to be specified in CIDR
2665 notation. Thanks to a patch from David Boyce.
2667 - The subnet-mask option is now supplied by default, but at lowest
2668 priority. This helps a small minority of clients that provide parameter
2669 request lists, but do not list the subnet-mask option because they were
2670 designed to interoperate with a server that behaves in this manner.
2672 - The FQDN option is similarly supplied even if it does not appear on the
2673 parameter request list, but not to the exclusion of options that do
2674 appear at the parameter request list. Up until now it had ultimate
2675 priority over the client's parameter request list.
2677 - Varying option space code and length bit widths (8/16/32) are now
2678 supported. This is a milestone in achieving RFC 3925 "VIVSO" and
2681 - A new common (server or client) option, 'db-time-format local;', has
2682 been added which prints the local time in /var/db/dhcpd.leases rather
2683 than UTC. Thanks to a patch from Ken Lalonde.
2685 - Some patches to improve DHCP Server startup speed from Andrew Matheson
2686 have been incorporated.
2688 - Failover pairs now implement 'MAC Affinity' on leases moving from the
2689 active to free states. Leases that belonged to the failover secondary
2690 are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
2691 If lease rebalancing must move leases, it tries first to move leases
2692 that belong to the peer in need.
2694 - The server no longer sends POOLREQ messages unless the pool is severely
2695 misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
2697 - Pool rebalance events no longer happen upon successfully allocating a
2698 lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
2699 min-balance and max-balance statements for more information.
2701 - The DHCP Relay Agent Information Option / Link Selection Sub-Option
2702 is now supported. (See RFC3527 for details).
2704 - A new DDNS related server option, update-conflict-detection, has been
2705 added. If this option is enabled, dhcpd will perform normal DHCID
2706 conflict resolution (the default). If this option is disabled, it will
2707 instead trust the assigned name implicitly (removing any other bindings
2708 on that name). This option has not been made available in dhclient.
2710 - In those cases where the DHCP software manufactures an IP header (to
2711 transmit via bpf, lpf, etc), the IP TTL the software selects has been
2712 increased from 16 to 128. This is intended to match Microsoft Windows
2713 DHCP Client behaviour, to increase compatibility.
2715 - 'ignore client-updates;' now has behaviour that is different from
2716 'deny client-updates;'. The client's request is not truly ignored,
2717 rather it is encouraged. Should this value be configured, the server
2718 updates DNS as though client-updates were set to 'deny'. That is, it
2719 enters into DNS whatever it is configured to do already, provided it is
2720 configured to. Then it sends a response to the client that lets the
2721 client believe it is performing client updates (which it will), probably
2722 for a different name. In essence, this lets the client do as it will,
2723 ignoring this aspect of their request.
2725 - Support for compressed 'domain name list' style DHCP option contents, and
2726 in particular the domain search option (#119) was added.
2728 - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
2729 LEASEQUERY lets you query the DHCP server for information about a lease,
2730 using either an IP address, MAC address, or client identifier. Thanks
2731 to a patch from Justin Haddad.
2733 - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
2734 ethernet mac address) on the SCO platform specifically without any strange
2735 ifconfig hacks. Many thanks go to the Kroger Co. for donating the
2736 hardware and funding the development.
2738 - A new common configuration executable statement, execute(), has been
2739 added. This permits dhcpd or dhclient to execute a named external
2740 program with command line arguments specified from other configuration
2741 language. Thanks to a patch written by Mattias Ronnblom, gotten to us
2744 - A new dhcp server option 'adaptive-lease-time-threshold' has been added
2745 which causes the server to substantially reduce lease-times if there are
2746 few (configured percentage) remaining leases. Thanks to a patch submitted
2749 - Encapsulated option spaces within encapsulated option spaces is now
2752 Changes since 3.0.6rc1
2754 - supersede_lease() now requeues leases in their respective hardware
2755 address hash bucket. This mirrors client identifier behaviour.
2759 - Assorted fixes for broken network devices: Packet length is now
2760 determined from the IP header length field to finally calculate the
2761 UDP payload length, because some NIC drivers return more data than
2762 they actually received.
2764 - UDP packets are now stored in aligned data structures.
2766 - A logic error in omapi interface code was repaired that might result in
2767 incorrectly indicating 'up' state when any flags were set, rather than
2768 specifically the INTERFACE_REQUESTED flag. Thanks to a patch from
2769 Jochen Voss which got to us via Andrew Pollock at Debian.
2771 - A reference leak on binding scopes set by ddns updates was repaired.
2773 - A memory leak in the minires_nsendsigned() function call was repaired.
2774 Effectively, this leaked ~176 bytes per DDNS update.
2776 - In the case where an "L2" DHCP Relay Agent (one that does not set giaddr)
2777 was directly attached to the same broadcast domain as the DHCP server,
2778 the RFC3046 relay agent information option was not being returned to the
2779 relay in the server's replies. This was fixed; the dhcp server no longer
2780 requires the giaddr to reply with relay agent information. Note that
2781 this also improves compatibility with L2 devices that "intercept" DHCP
2782 packets and expect relay agent information even in unicast (renewal)
2783 replies. Thanks to a patch from Pekka Silvonen.
2785 - A bug was fixed where the BOOTP header 'sname' field had a value, the
2786 copy written to persistent storage was actually the contents of the
2789 - A bug was fixed where the nwip virtual option space was referencing
2790 the fqdn option's virtual option space's option cache.
2792 - Timestamp parsing errors that indicated missing "minutes" fields rather
2793 than the actually missing "seconds" fields have been repaired thanks to
2794 a patch from Kevin Steves.
2796 - A grammar error in the dhclient.8 manpage was repaired thanks to a patch
2799 - Several spelling typos were repaired, and some cross-references to other
2800 relevant documents were included in the manpages, thanks to a patch
2801 by Andrew Pollock which got to us via Tomas Pospisek.
2803 - Some bugs were fixed in the 'emergency relay agent options hologram'
2804 which is used to retain relay agent option contents from when the
2805 client was in INIT or REBIND states. This should solve problems where
2806 relay agent options were not echoed from the server, even when giaddr
2809 - dhclient now closes its descriptor to dhclient.leases prior to executing
2810 dhclient-script. Thanks to a patch from Tomas Pospisek.
2812 - The server's "by client-id" and "by hardware address" hash table lists
2813 are now sorted according to the preference to re-allocate that lease to
2814 returning clients. This should eliminate pool starvation problems
2815 arising when "INIT" clients were given new leases rather than presently
2818 Changes since 3.0.5rc1
2820 - A bug was repaired in fixes to the dhclient, which sought to run the
2821 dhclient-script with the 'EXPIRE' state should it receive a NAK in
2822 response to a REQUEST. The client now iterates the PREINIT state
2823 after the EXPIRE state, so that interfaces that might be configured
2824 'down' can be brought back 'up' and initialized.
2826 - DHCPINFORM handling for clients that properly set ciaddr and come to the
2827 server via a relay aget has been repaired.
2831 - A warning that host statements declared within subnet or shared-network
2832 scopes are actually global has been added.
2834 - The default minimum lease time (if min-lease-time was not specified)
2835 was raised from 0 to 300. 0 is not thought to be sensible, and is
2836 known to be damaging.
2838 - Added additional fatal error sanity checks surrounding lease binding
2839 state count calculations (free/active counts used for failover pool
2842 - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
2843 misapplied to server values rather than client values. The server no longer
2844 advertises 8-byte lease-time options when on 64-bit platforms.
2846 - A bug where leases not in ACTIVE state would get billed to billed classes
2847 (classes with lease limitations) was fixed. Non-active leases OFFERed
2848 to clients are no longer billed (but billing is checked before offering).
2850 - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
2851 configuration option - the default configuration and results should be
2854 - If the dhclient were to receive a DHCPNAK while it was in the RENEW
2855 state (and consequently, had an active, 'bound' address and related
2856 configuration options), it would fail to 'tear down' this information
2857 before proceeding into INIT state. dhclient now iterates the dhclient-
2858 script with the 'EXPIRE' action to cause these teardowns prior to entering
2859 INIT state. Thanks to a patch from Chris Zimmerman.
2861 - The omapi.1 manpage had some formatting errors repaired thanks to a patch
2862 from Yoshihiko Sarumaru.
2864 - A few lines of code that were failover-specific were moved within
2865 #if defined() clauses so that compilation without failover could be
2868 - The log message emitted when the 'leased-address' value was not available
2869 in dhcpd.conf "executable statements" has been updated to be more helpful.
2870 Manpage information for this value has also been updated.
2872 - Abandoned or dissociated (err condition) leases now remove any related
2873 dynamic dns bindings. Thanks to a patch from Patrick Schoo.
2875 - Attempting to write a new lease file to replace a corrupt (due to
2876 encountering non-retryable errors during writing) lease file should
2877 no longer result in an infinite recursion.
2879 - Host declaration hardware addresses and client identifiers may only be
2880 configured once. dhcpd will now fail to load config files that specify
2881 multiple identifiers (previous versions would silently over-ride the
2882 value with the later configured value).
2884 - Several option codes that have been allocated since our last release
2885 have been named and documented.
2887 - Option names of the form "unknown-123" have been removed from the in-
2888 memory hash tables. In order to support options of these names that
2889 may appear in dhclient.leases or similar in previous versions, the
2890 parser will now find the new option code definition, or mock up a
2891 generic option code definition. This should result in a smooth
2892 transition from one name to the other, as the new name is used to
2895 Changes since 3.0.4rc1
2897 - The dhcp-options.5 manpage was updated to correct indentation errors
2898 thanks to a patch from Jean Delvare.
2900 Changes since 3.0.4b3
2902 - Some manual pages were clarified pursuant to discussion on the dhcp-server
2905 Changes since 3.0.4b2
2907 - Null-termination sensing for certain clients that unfortunately require
2908 it in DHCPINFORM processing was repaired.
2910 - The host-name option and a few others were moved from "X" format to "t"
2911 format to be compatible with new NULL handling functions.
2913 - DHCPINFORM processing is a little more careful about return addressing
2914 its responses, or if responding via a relay. The INFORM related
2915 messages also log the 'effective client ip address' rather than the
2916 client's supplied ciaddr (since some clients produce null ciaddrs).
2918 - The server was inappropriately sending leases to the RESET state in the
2919 event that multiple active leases were found to match a singly-identified
2920 client. This was changed to RELEASED (by accepting a different, ACTIVE
2921 binding, the client is implicitly releasing its lease). This repairs a
2922 bug wherein secondary servers in failover pairs detecting this condition
2923 move leases to RESET, and primaries refuse to accept that state
2924 transition (properly).
2926 - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
2928 Changes since 3.0.4b1
2930 - Command line parsing in omshell was repaired - it no longer closes
2931 STDIN after reading one line.
2933 - The resolver library no longer closes the /etc/resolv.conf file
2934 descriptor it opened twice.
2936 - Changes to trailing NULL removal in 't' option-atoms has been rethought,
2937 it now includes 'd' (domain name) types, and tries hard not to rewind an
2938 option beyond the start of the text field it is un-terminating.
2942 - A DDNS update handling function was misusing the DNS error codes, rather
2943 than the internal generic result enumeration. The result is a confusing
2944 syslog line, logging the wrong condition.
2946 - The DHCP Server was not checking pool balance in the case where it brought
2947 a non-ACTIVE lease out of storage for a client that was returning to use
2948 a lease it once had long ago, and had since expired.
2950 - Failover peers no longer bother to look for free leases to allocate when
2951 they already found the client's ACTIVE lease. DISCOVERs are load balanced
2952 whether freely-allocated or not, unless the server doubts the peer has
2955 - Fixed a bug in dhcrelay agent addition code that suppressed trailing
2956 PAD options - it was suppressing only one trailing PAD option, rather
2957 than the entire block of them.
2959 ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
2960 option addition and stripping code. Added a few sanity checks. Although
2961 highly improbable, due to requiring the reception of a DHCP datagram well
2962 in excess of all known to be used physical MTU limitations, it is possible
2963 this may have been used in a stack overflow security vulnerability. Thanks
2964 to a patch from infamous42md.
2966 ! Added some sanity checks to OMAPI connection/authentication code.
2967 Although highly improbable, due to having to deliver in excess of 2^32
2968 bytes of data via the OMAPI channel, not to mention requiring dhcpd to
2969 be able to malloc() a memory region 2^32 bytes in size, it was possible
2970 this might have resulted in a heap overflow security vulnerability.
2971 Thanks to a patch from infamous42md.
2973 - dmalloc() memset()'s the non-debug (data) portion of the allocated
2974 memory to zero. Code that memset()'s the result returned by dmalloc() to
2975 zero is redundant. These redundancies were removed.
2977 - Some type declaration corrections to u_int16_t were made in common/tr.c
2978 (Token Ring support) thanks to a patch from Jason Vas Dias at Red Hat.
2980 - A failover bug that was allowing leases that EXPIRED or were RELEASED
2981 where tsfp and tstp are identical timestamps to languish in these
2982 transitional states has been repaired. As a side effect, lease
2983 databases should be kept more consistent overall, not just for these
2984 transitional states.
2986 - If the lease db is deleted out from under the daemon, and it moves to rewrite
2987 the db, it will go ahead with the operation and move the new db into place
2988 once it detects the old db does not exist.
2990 - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
2991 is either nonsensical or (in the case of IEEE1394) is not known to support
2992 these interfaces. Thanks to Marius Gedminas and Andrew Pollock of Debian.
2994 - Some previously undocumented reasons for dhclient-script invoking has
2995 been documented in the dhclient-script.8 manpage.
2997 - Failover potential expiry calculations (TSTP) have been corrected. Results
2998 should be substantially more consistent, and proper given the constraints.
3000 - Adjusted lease state validation checks in potential-conflict, to
3001 account for possible clock skew similarly to normal state, and several
3002 previously illegal transitions were made legal (ex: active->released).
3004 - An impossible sanity check was removed from omapi/buffer.c, thanks to a
3005 patch from 'infamous42md'.
3007 - An OMAPI host/network byte order problem in lease time values has been
3010 - Several minor bugs, largely relating to treating 8-byte time values as
3011 4-byte entities, have been repaired after careful review of the FreeBSD
3012 ports collection's patch set. Thanks to the nameless entities who have
3013 contributed to the FreeBSD ports.
3015 - When writing a trace file, the file is now created with permissions 0600,
3016 to help administrators avoid accidentally publicising sensitive config
3019 - The calculation of the maximum size of DHCP packets no longer includes
3020 Ethernet framing overhead. The result is that the 'Maximum Message
3021 Size' option advertised by clients, or the default value 576, is no
3022 longer reduced by 14 bytes, and instead directly reflects the IP level
3023 MTU (and the default, minimum allowed IP MTU of 576).
3025 - The special status of RELEASED/EXPIRED/RESET leases when a server
3026 is operating in partner-down was fixed. It no longer requires a
3027 lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
3028 event to turn these into FREE leases without peer acknowledgement
3029 (after STOS+MCLT) has been repaired.
3031 - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
3034 - "append"ing a string onto the end of a "t" type option (such as the
3035 domain-name field) that had been improperly NULL-terminated by the
3036 DHCP server will no longer result in a truncated string containing
3037 only the option from the server, and not the expected appended value.
3038 Thanks to a patch from Jason Vas Dias at Red Hat.
3040 - File handlers on configuration state (config files and lease dbs) should
3041 be treated consistently, regardless of whether TRACING is defined or not.
3043 - The Linux build environment has had some minor improvements - better
3044 sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
3045 and corrections to #if operators regarding LINUX_MAJOR should it ever
3048 - The server now tries harder to survive the condition where it is unable
3049 to open a new lease file to rewrite the lease state database.
3051 Changes since 3.0.3b3
3053 - dhclient.conf documentation for interface {} was updated to reflect recent
3054 discussion on the dhcp-hackers mailing list.
3056 - In response to reports that the software does not compile on GCC 4.0.0,
3057 -Werror was removed from Makefile.conf for all platforms that used it.
3058 We will address the true problem in a future release; this is a temporary
3061 Changes since 3.0.3b2
3063 - An error in code changes introduced in 3.0.3b2 was corrected, which caused
3064 static BOOTP clients to receive random addresses.
3066 Changes since 3.0.3b1
3068 - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
3069 host records would be left behind on leases that were not allocated to the
3070 client currently booting (eg in the case where the host was denied booting).
3072 - The dhcpd.conf.5 manpage was updated to be more clear in regards to
3073 multiple host declarations (thanks to Vincent McIntyre). 'Interim' style
3074 dynamic updates were also retouched.
3078 - A bug was fixed where a server might load balance a DHCP REQUEST to its
3079 peer after already choosing not to load balance the preceding DISCOVER.
3080 The peer cannot allocate the originating server's lease.
3082 - In the case where a secondary server lost its stable storage while the
3083 primary was still in communications-interrupted, and came back online,
3084 the lease databases would not be fully transferred to the secondary.
3085 This was due to the secondary errantly sending an extra UPDREQ message
3086 when the primary made its state transition to PARTNER-DOWN known.
3088 - The package will now compile cleanly in gcc 3.3 and 3.4. As a side effect,
3089 lease structures will be 9 bytes smaller on all platforms. Thanks to
3090 Jason Vas Dias at Red Hat.
3092 - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
3093 properly restricted to only detecting broadcast interfaces. Thanks
3094 to a patch from Jason Vas Dias at Red Hat.
3096 - decode_udp_ip_header was changed so that the IP address was copied out
3097 to a variable, rather than referenced by a pointer. This enforces 4-byte
3098 alignment of the 32-bit IP address value. Thanks to a patch from Dr.
3101 - An incorrect log message was corrected thanks to a patch from
3104 - A bug in DDNS was repaired, where if the server's first DDNS action was
3105 a DDNS removal rather than a DDNS update, the resolver library's
3106 retransmit timer and retry timer was set to the default, implying a
3107 15 second timeout interval. Which is a little excessive in a synchronous,
3108 single-threaded system. In all cases, ISC DHCP should now hold fast to
3109 a 1-second timeout, trying only once.
3111 - The siaddr field was being improperly set to the server-identifier when
3112 responding to DHCP messages. RFC2131 clarified the siaddr field as
3113 meaning the 'next server in the bootstrap process', eg a tftp server.
3114 The siaddr field is now left zeroed unless next-server is configured.
3116 - mockup_lease() could have returned in an error condition (or in the
3117 condition where no fixed-address was found matching the shared
3118 network) with stale references to a host record. This is probably not
3119 a memory leak since host records generally never die anyway.
3121 - A bug was repaired where failover servers would let stale client identifiers
3122 persist on leases that were reallocated to new clients not sending an id.
3124 - Binding scopes ("set var = value;") are now removed from leases allocated
3125 by failover peers if the lease had expired. This should help reduce the
3126 number of stale binding scopes on leases.
3128 - A small memory leak was closed involving client identifiers larger than
3129 7 bytes, and failover.
3131 - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
3132 cause an internal function to overflow heap. Thanks to Jason Vas Dias
3135 - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
3136 or 'NUMBER_OR_NAME' was repaired. Hexadecimal parsing is affected, and
3139 - In several cases, parse warnings were being issued before the lexical
3140 token had been advanced to the token whose value was causing an error...
3141 causing parse warnings to claim the problem is on the wrong token.
3143 - Host declarations matching on client identifier for dynamic leases will
3144 no longer match fixed-address host declarations (this is now identical
3145 to behaviour for host records matching on hardware address).
3147 Changes since 3.0.2rc3
3149 - A previously undocumented configuration directive, 'local-address',
3150 was documented in the dhcpd.conf manpage.
3152 Changes since 3.0.2rc2
3154 - Two variables introduced in 3.0.2b1 were used without being initialized
3155 in the case where neither the FILE nor SNAME fields were available for
3156 overloading. This was repaired.
3158 - A heretofore believed to be impossible corner case of the option
3159 overloading implementation turned out to be possible ("Unable to sort
3160 overloaded options after 10 tries."). The implementation was reworked
3161 to consider the case of an option so large it would require more than
3162 three chunks to fit.
3164 - Many other instances of variables being used without being initialized
3167 - An uninitialized variable in omapi_io_destroy() led to the discovery
3168 that this function may result in orphaned pointers (and hence, a memory
3171 Changes since 3.0.2rc1
3173 - allocate_lease() was rewritten to repair a bug in which the server would
3174 try to allocate an ABANDONED lease when FREE leases were available.
3176 Changes since 3.0.2b1
3178 - Some dhcp-eval.5 manpage formatting was repaired.
3182 - A bug was fixed in the server's 'option overloading' implementation,
3183 where options loaded into the 'file' and 'sname' packet fields were
3184 not aligned precisely as rfc2131 dictates.
3186 - The FreeBSD client script was changed to support the case where a domain
3187 name was not provided by the server.
3189 - A memory leak in 'omshell' per each command line parsed was
3190 repaired, thanks to a patch from Jarkko Torppa.
3192 - Log functions writing to stderr were adjusted to use the STDERR_FILENO
3193 system definition rather than '2'. This is a no-op for 90% of platforms.
3195 - One call to trace_write_packet_iov() counted the number of io vectors
3196 incorrectly, causing inconsistent tracefiles. This was fixed.
3198 - Some expression parse failure memory leaks were closed.
3200 - A host byte order problem in tracefiles was repaired.
3202 - Pools configured in DHCPD for failover possessing permission lists that
3203 previously were assumed to not include dynamic bootp clients are now
3204 a little more pessimistic. The result is, dhcpd will nag you about just
3205 about most pools that possess a 'allow' statement with no 'deny' that
3206 would definitely match a dynamic bootp client.
3208 - The 'ddns-update-style' configuration warning bit now insists that
3209 the configuration be globally scoped.
3211 - Two memory leaks in dhclient were closed thanks to a patch from Felix
3214 - Some minor but excellently pedantic documentation errors were fixed
3215 thanks to a patch from Thomas Klausner.
3217 - Bugs in operator precedence in executable statements have been repaired
3218 once again. More legal syntaxes should be parsed legally.
3220 - Failing to initialize a tracefile for any reason if a tracefile was
3221 specified is now a fatal error. Thanks to a patch from Albert Herranz.
3223 - Corrected a bug in which the number of leases transferred as calculated
3224 by the failover primary and sent to peers in POOLRESP responses may be
3225 incorrect. This value is not believed to be used by other failover
3226 implementations, excepting perhaps as logged information.
3228 - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
3229 sending POOLREQ messages instead of POOLRESP mesasges. This message
3230 was essentially ignored since failover secondaries effectively do not
3231 respond to POOLREQ messages.
3233 - Type definitions for various bitwidths of integers in the sunos5-5
3234 build of ISC DHCP have been fixed. It should compile and run more
3235 easily when built in 64-bit for this platform.
3237 - "allow known-clients;" is now a legal syntax, to avoid confusion.
3239 - If one dhcp server chooses to 'load balance' a request to its failover
3240 peer, it first checks to see if it believes said peer has a free
3241 lease to allocate before ignoring the DISCOVER.
3243 - log() was logging a work buffer, rather than the value returned by
3244 executing the statements configured by the user. In some cases,
3245 the work buffer and the intended results were the same. In some other
3246 cases, they were not. This was fixed thanks to a patch from Gunnar
3247 Fjone and directconnect.no.
3249 - Compiler warnings for some string type conversions was fixed, thanks
3250 to Andreas Gustafsson.
3252 - The netbsd build environments were simplified to one, in which
3253 -Wconversion is not used, thanks to Andreas Gustafsson.
3255 - How randomness in the backoff-cutoff dhclient configuration variable
3256 is implemented was better documented in the manpage, and the behaviour
3257 of dhclient in REQUEST timeout handling was changed to match that of
3258 DISCOVER timeout handling.
3260 - Omapi was hardened against clients that pass in null values, thanks
3261 to a patch from Mark Jason Dominus.
3263 - A bug was fixed in dhclient that kept it from doing client-side
3264 ddns updates. Thanks to a patch from Andreas Gustafsson, which
3265 underwent some modification after review by Jason Vas Dias.
3267 - Failover implementations disconnected due to the network between
3268 them (rather than one of the two shutting down) will now try to
3269 re-establish the failover connection every 5 seconds, rather than
3270 to simply try once and give up until one of them is restarted.
3271 Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
3272 by Greger V. Teigre which led to an enhancement to it.
3274 - A problem that kept DHCP Failover secondaries from tearing down
3275 ddns records was repaired. Thanks to a patch from Ulf Ekberg from
3278 - 64bit pointer sizes are detected properly on FreeBSD now.
3280 - A bug was repaired where the DHCP server would leave stale references
3281 to host records on leases it once thought about offering to certain
3282 clients. The result would be to apply host and 'known' scopes to the
3283 wrong clients (possibly denying booting). NOTE: The 'mis-host' patch
3284 that was being circulated as a workaround is not the way this bug was
3285 fixed. If you were a victim of this bug in 3.0.1, you are cautioned
3286 to proceed carefully and see if it fixes your problem.
3288 - A bug was repaired in the server's DHCPINFORM handling, where it
3289 tried to divine the client's address from the source packet and
3290 would get it wrong. Thanks to Anshuman Singh Rawat.
3292 - A log message was introduced to help illuminate the case where the
3293 server was unable to find a lease to assign to any BOOTP client.
3294 Thanks to Daniel Baker.
3296 - A minor dhcpd.conf.5 manpage error was fixed.
3298 Changes since 3.0.1rc14
3300 - The global variable 'cur_time' was centralized and is now uniformly of a
3301 type #defined in system-dependent headers. It had previously been defined
3302 in one of many places as a 32-bit value, and this causes mayhem on 64-bit
3303 big endian systems. It probably wasn't too healthy on little endian
3306 - A printf format string error introduced in rc14 was repaired.
3308 - AIX system-dependent header file was altered to only define NO_SNPRINTF
3309 if the condition used to #ifdef in vsnprintf in AIX' header files
3312 - The Alpha/OSF system-dependent header file was altered to define
3313 NO_SNPRINTF on OS revisions older than 4.0G.
3315 - omapip/test.c had string.h added to its includes.
3317 Changes since 3.0.1rc13
3319 ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
3320 in logging messages with excessively long hostnames provided by the
3321 clients. It is highly probable that these could have been used by
3322 attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
3323 release candidates 12 or 13. Special thanks to Gregory Duchemin for
3324 both finding and solving the problem.
3326 ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
3327 in log_*() functions was evidenced, on some specific platforms where
3328 vsnprintf() was not believed to be available and calls were wrapped to
3329 sprintf() instead. Again, credit goes to Gregory Duchemin for finding
3330 the problem. Calls to snprintf() are now linked to a distribution-local
3331 snprintf implementation, only in those cases where the architecture is
3332 not known to provide one (see includes/cf/[arch].h). If you experience
3333 linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
3334 is where to look. This vulnerability did not exist in any previously
3335 published version of ISC DHCP.
3337 - Compilation on hpux 11.11 was repaired.
3339 - 'The cross-compile bug fix' was backed out.
3341 Changes since 3.0.1rc12
3343 - Fixed a bug in omapi lease lookup function, to form the hardware
3344 address for the hash lookup correctly, thanks to a patch from
3347 - Fixed a bug where dhcrelay was sending relayed responses back to the
3348 broadcast address, but with the source's unicast mac address. Should
3349 now conform to rfc2131 section 4.1.
3351 - Cross-compile bug fix; use $(AR) instead of ar. Thanks to Morten Brorup.
3353 - Fixed a crash bug in dhclient where dhcpd servers that do not provide
3354 renewal times results in an FPE. As a side effect, dhclient can now
3355 properly handle 0xFFFFFFFF (-1) expiry times supplied by servers. Thanks
3356 to a patch from Burt Silverman.
3358 - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
3359 and reformatted to correct a compilation error on Solaris platforms.
3361 - A patch was applied which fixes a case where leases read from the
3362 leases database do not properly over-ride previously read leases.
3364 - dhcpctl.3 manpage was tweaked.
3366 Changes since 3.0.1rc11
3368 - A patch from Steve Campbell was applied with minor modifications to
3369 permit reverse dns PTR record updates with values containing spaces.
3371 - A patch from Florian Lohoff was applied with some modifications to
3372 dhcrelay. It now discards packets whose hop count exceeds 10 by default,
3373 and a command-line option (-c) can be used to set this threshold.
3375 - A failover bug relating to identifying peers by name length instead of
3378 - Declaring failover configs within shared-network statements should no
3379 longer result in error.
3381 - The -nw command line option to dhclient now works.
3383 - Thanks to a patch from Michael Richardson:
3384 - Some problems with long option processing have been fixed.
3385 - Some fixes to minires so that updates of KEY records will work.
3387 - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
3388 see contrib/ms2isc/readme.txt for revision notes.
3390 - Dhclient no longer uses shell commands to kill another instance of
3391 itself, it sends the signal directly. Thanks to a patch from Martin
3394 - The FreeBSD dhclient-script was changed so that a failure to write to
3395 /etc/resolv.conf does not prematurely end the script. This keeps dhclient
3396 from looping infinitely when this is the case. Thanks to a patch from
3399 - A patch from Bill Stephens was applied which resolves a problem with lease
3400 expiry times in failover configurations.
3402 - A memory leak in configuration parsing was closed thanks to a patch from
3405 - The function which discovers interfaces will now skip non-broadcast or
3406 point-to-point interfaces, thanks to a patch from David Brownlee.
3408 - Options not yet known by the dhcpd or dhclient have had their names
3409 changed such that they do not contain # symbols, in case they should ever
3410 appear in a lease file. An option that might have been named "#144" is
3413 - Another patch from Bill Stephens which allows the ping-check timeout to
3414 be configured as 'ping-timeout'. Defaults to 1.
3416 Changes since 3.0.1rc10
3418 - Potential buffer overflows in minires repaired.
3420 - A change to the linux client script to use /bin/bash, since /bin/sh may
3423 - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
3425 - A correction of boolean parsing syntax validation - some illegal syntaxes
3426 that worked before are now detected and produce errs, some legal syntaxes
3427 that errored before will now work properly.
3429 - Some search-and-replace errors that caused some options to change their
3432 - Shu-min Chang of the Intel corporation has contributed a perl script and
3433 module that converts the MS NT4 DHCP configuration to a ISC DHCP3
3436 - Applied the remainder of the dhcpctl memory leak patch provided by Bill
3437 Squier at ReefEdge, Inc. (groo@reefedge.com).
3439 - Missing non-optional failover peer configurations will now result in a soft
3440 error rather than a null dereference.
3442 Changes since 3.0.1rc9
3444 - A format string was corrected to fix compiler warnings.
3446 - A number of spelling corrections were made in the man pages.
3448 - The dhclient.conf.5 man page was changed to refer to do-forward-updates
3449 rather than a configuration option that doesn't exist.
3451 - A FreeBSD-specific bug in the interface removal handling was fixed.
3453 - A Linux-specific Token Ring detection problem was fixed.
3455 - Hashes removed from as-yet-unknown agent options, having those options
3456 appear in reality before we know about them will no longer produce
3457 self-corrupting lease databases.
3459 - dhclient will use the proper port numbers now when using the -g option.
3461 - A order-of-operations bug with 2 match clauses in 1 class statement is
3462 fixed thanks to a patch from Andrew Matheson.
3464 - Compilation problems on Solaris were fixed.
3466 - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
3468 - A fix to the dhcp ack process which makes certain group options will be
3469 included in the first DHCPOFFER message was made thanks to a patch from
3472 - A few memory leaks were repaired thanks to patches from Bill Squier at
3473 ReefEdge, Inc. (groo@reefedge.com).
3475 - A fix for shared-networks that sometimes give clients options for the
3476 wrong subnets (in particular, 'option routers') was applied, thanks to
3477 Ted Lemon for the patch.
3479 - Omshell's handling of dotted octets as values was changed such that dots
3480 one after the other produce zero values in the integer string.
3482 Changes since 3.0.1rc8
3484 - Fix a format string vulnerability in the server that could lead to a
3485 remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
3487 - Add additional support for NetBSD/sparc64.
3489 - Fix a bug in the command-line parsing of the client. Also, resolve
3492 - Add better support for shells other than bash in the Linux client
3495 - Various build fixes for modern versions of FreeBSD and Linux.
3497 - Fix a bad bounds check when printing binding state names.
3499 - Clarify documentation about fixed-address and multiple addresses.
3501 - Fix a typo in the authoritative error message.
3503 - Make a log entry when we can't write a billing class.
3505 - Use conversion targets that are the right size on all architectures.
3507 - Increment the hop count when relaying.
3509 - Log a message when lease state is changed through OMAPI.
3511 - Don't rerun the shared_network when evaluating the pool.
3513 - Fix a reversed test in the parser.
3515 - Change the type of rbuf_max.
3517 - Make FTS_LAST a manifest constant to quiet warnings.
3519 Changes since 3.0.1rc7
3521 - Fix two compiler warnings that are generated when compiling on Solaris
3522 with gcc. These stop the build, even though they weren't actually
3523 errors, because we prefer that our builds generate no warnings.
3525 Changes since 3.0.1rc6
3527 - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
3530 - Implement lease stealing for cases where the primary has fewer leases
3531 than the secondary, as called for by the standard.
3533 - Add a fudge factor to the lease expiry acceptance code, (suggested
3534 by Kevin Miller of CMU).
3536 - Fix a bug in permit_list_match that made it much too willing to say
3537 that two permit lists matched.
3539 - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
3540 also more compact) messages about DNS updates.
3542 - Fix a bug in generating wire-format domain names for the FQDN option.
3544 - Fix a bug where the FQDN option would not be returned if the client
3545 requested it, contrary to the standard.
3547 - On Darwin, use the FreeBSD DHCP client script.
3549 - On NetBSD/sparc, don't check for casting warnings.
3551 - Add a flag in the DHCP client to disable updating the client's A
3552 record when sending an FQDN option indicating that the client is
3553 going to update its A record.
3555 - In the client, don't attempt a DNS update until one second after
3556 configuring the new IP address, and if the update times out, keep
3557 trying until a response, positive or negative, is received from the
3560 - Fix an uninitialized memory bug in the DHCP client.
3562 - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
3564 - Fix a bug in ns_parserr(), where it was returning the wrong sort
3565 of result code in some cases (suggested by Ben Harris of the
3568 - Fix a bug in is_identifier(), where it was checking against EOF
3569 instead of the END_OF_FILE token (also suggested by Ben Harris).
3571 - Fix a bug where if an option universe contained no options, the
3572 DHCP server could dump core (Walter Steiner).
3574 - Fix a bug in the handling of encapsulated options.
3576 - Fix a bug that prevented NWIP suboptions from being processed.
3578 - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
3579 as modifier flags to the FTS_ACTIVE state, as called for in the
3580 failover protocol standard.
3582 - Fix bugs in the pool merging code that resulted in references and
3583 dereferences of null pointers. This bug had no impact unless the
3584 POINTER_DEBUG flag was defined.
3586 - In the server, added a do-forward-updates flag that can be used to
3587 disable forward updates in all cases, so that sites that want the
3588 clients to take sole responsibility for updating their A record can
3591 - Make it possible to disable optimization of PTR record updates.
3593 Changes since 3.0.1rc5
3595 - Include some new documentation and changes provided by Karl Auer.
3597 - Add a workaround for some Lexmark printers that send a double-NUL-
3598 terminated host-name option, which would break DNS updates.
3600 - Fix an off-by-one error in the MAC-address checking code for
3601 DHCPRELEASE that was added in 3.0.1rc5.
3603 - Fix a bug where client-specific information was not being discarded
3604 from the lease when it expired or was released, resulting in
3605 problems if the lease was reallocated to a different client.
3607 - If more than one allocation pool is specified that has the same set
3608 of constraints as another allocation pool on the same shared
3609 network, merge the two pools.
3611 - Don't print an error in fallback_discard, since this just causes
3612 confusion and does not appear to be helping to encourage anyone to
3615 Changes since 3.0.1rc4
3617 - Fix a bug that would cause the DHCP server to spin if asked to parse
3618 a certain kind of incorrect statement.
3620 - Fix a related bug that would prevent an error from being reported in
3623 - Additional documentation.
3625 - Make sure that the hardware address matches the lease when
3626 processing a DHCPRELEASE message.
3628 Changes since 3.0.1rc3
3630 - A minor bug fix in the arguments to a logging function call.
3631 - Documentation update for dhcpd.conf.
3633 Changes since 3.0.1rc2
3635 - Allow the primary to send a POOLREQ message. This isn't what the current
3636 failover draft says to do, so we may have to back it out if I can't get the
3637 authors to relent, but the scheme for balancing that's specified in the
3638 current draft seems needlessly hairy, so I'm floating a trial balloon.
3639 The rc1 code did not implement the method described in the draft either.
3641 Changes since 3.0.1rc1
3643 - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
3644 domain or RRSET. This allows the DHCP server to forget about a name
3645 it added to the DNS once it's been removed, even if the DHCP server
3646 wasn't the one that removed it.
3648 - Install defaults for failover maximum outstanding updates and maximum
3649 silent time. This prevents problems that might occur if these values
3650 were not configured.
3652 - Don't do DDNS deletes if ddns-update-style is none.
3654 - Return relay agent information options in DHCPNAK. This prevents DHCPNAK
3655 messages from being dropped when the relay agent information option contains
3656 routing information.
3658 - Fix a problem where coming up in recover wouldn't result in an update
3661 - Add some more chatty messages when we start a recovery update and when it's
3664 - Fix a possible problem where some state might have been left around
3665 after the peer lost contact and regained contact about how many updates
3668 - Don't nix a lease update because of a lease conflict. This test has
3669 never (as far as I know) prevented a mistake, and it appears to cause
3670 problems with failover.
3672 - Add support in rc history code for keeping a selective history, rather
3673 than a history of all references and dereferences. This code is only used
3674 when extensive additional debugging is enabled.
3678 - Make allocators for hash tables. As a side effect, this fixes a memory
3679 smash in the subclass allocation code.
3681 - Fix a small bug in omshell where if you try to close an object when
3682 no object is open, it dumps core.
3684 - Fix an obscure coredump that could occur on shutdown.
3686 - Fix a bug in the recording of host declaration rubouts in the lease file.
3688 - Fix two potential spins in the host deletion code.
3690 - Fix a core dump that would happen if an application tried to update
3691 a host object attribute with a null value.
3693 Changes since 3.0 Release Candidate 12
3695 - Fix a memory leak in the evaluation code.
3697 - Fix an obscure core dump.
3699 - Print a couple of new warnings when parsing the configuration file
3700 when crucial information is left out.
3702 - Log "no free leases" as an error.
3704 - Documentation updates.
3706 Changes since 3.0 Release Candidate 11
3708 - Always return a subnet selection option if one is sent.
3710 - Fix a warning that was being printed because an automatic data
3711 structure wasn't zeroed.
3713 - Fix some failover state transitions that were being handled
3716 - When supersede_lease is called on a lease whose end time has already
3717 expired, but for which a state transition has not yet been done, do
3718 a state transition. This fixes the case where if the secondary
3719 allocated a lease to a client and the lease "expired" while the
3720 secondary was in partner-down, no expiry event would actually
3721 happen, so the lease would remain active until the primary was
3724 Changes since 3.0 Release Candidate 10
3726 - Fix a bug that was preventing released leases from changing state
3727 in failover-enabled pools.
3729 - Fix a core dump in the client identifier finder code (for host
3732 - Finish fixing a bug where bogus data would sometimes get logged to
3733 the dhclient.leases file because it was opened as descriptor 2.
3735 - Fix the Linux dhclient-script according to suggestions made by
3736 several people on the dhcp-client mailing list.
3738 - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
3740 - Print an error message and refuse to run if a failover peer is
3741 defined but not referenced by any pools.
3743 - Correct a confusing error message in failover.
3745 Changes since 3.0 Release Candidate 9
3747 - Fix a bug in lease allocation for Dynamic BOOTP clients.
3749 Changes since 3.0 Release Candidate 8 Patchlevel 2
3751 - Fix a bug that prevented update-static-leases from working.
3753 - Document failover-state OMAPI object.
3755 - Fix a compilation error on SunOS 4.
3757 Changes since 3.0 Release Candidate 8 Patchlevel 1
3759 - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
3760 This was introduced in rc8pl1 as an unintended result of the memory
3761 leakage fixes that were in pl1.
3763 - Fix a long-standing bug where the server would record that an update
3764 had been done for a client with no name, even though no update had
3765 been done, and then when the client's lease expired the deletion of
3766 that nonexistant record would time out because the name was the null
3769 - Clean up the omshell, dhcpctl and omapi man pages a bit.
3771 Changes since 3.0 Release Candidate 8
3773 - Fix a bug that could cause the DHCP server to spin if
3774 one-lease-per-client was enabled.
3776 - Fix a bug that was causing core dumps on BSD/os in the presence of
3779 - In partner-down state, don't restrict lease lengths to MCLT.
3781 - On the failover secondary, record the MCLT received from the primary
3782 so that if we come up without a connection to the primary we don't
3783 wind up giving out zero-length leases.
3785 - Fix some compilation problems on BSD/os.
3787 - Fix a bunch of memory leaks.
3789 - Fix a couple of bugs in the option printer.
3791 - Fix an obscure error reporting bug in the dns update code, and also
3792 make the message clearer when a key algorithm isn't supported.
3794 - Fix a bug in the tracing code that prevented trace runs that used
3795 tcp connections from being played back.
3797 - Add some additional debugging capability for catching memory leaks
3800 - Make the client release the lease correctly on shutdown.
3802 - Add some configurability to the build system.
3804 - Install omshell manual page in man1, not man8.
3806 - Craig Gwydir sent in a patch that fixes a long-standing bug in the
3807 DHCP client that could cause core dumps, but that for some reason
3808 hadn't been noticed until now.
3810 Changes since 3.0 Release Candidate 7
3812 - Fix a bug in failover where we weren't sending updates after a
3813 transition from communications-interrupted to normal.
3815 - Handle expired/released/reset -> free transition according to the
3816 protocol specification (this works - the other way not only wasn't
3817 conformant, but also didn't work).
3819 - Add a control object in both client and server that allows either
3820 daemon to be shut down cleanly.
3822 - When writing a lease, if we run out of disk space, shut down the
3823 output file and insist on writing a new one before proceeding.
3825 - In the server, if the OMAPI listener port is occupied, keep trying
3826 to get it, rather than simply giving up and exiting.
3828 - Support fetching variables from leases and also updating and adding
3829 variables to leases via OMAPI.
3831 - If two failover peers have wildly different clocks, refuse to start
3834 - Fix a bug in the DNS update code that could cause core dumps when
3835 running on alpha processors.
3837 - Fixed a bug in ddns updates for static lease entries, thanks to a
3838 patch from Andrey M Linkevitch.
3840 - Add support for Darwin/MacOS X
3842 - Install omshell (including new documentation).
3844 - Support DNS updates in the client (this is a very obscure feature
3845 that most DHCP client users probably will not be able to use).
3847 - Somewhat cleaner status logging in the client.
3849 - Make OMAPI key naming syntax compatible with the way keys are
3850 actually named (key names are domain names).
3852 - Fix a bug in the lease file writer.
3854 - Install DHCP ISC headers in a different place than BIND 9 ISC
3855 headers, to avoid causing trouble in BIND 9 builds.
3857 - Don't send updates for attributes on an object when the attributes
3858 haven't changed. Support deleting attributes on remote objects.
3860 - Fix a number of bugs in omshell, and add the unset and refresh
3863 - Handle disconnects in OMAPI a little bit more intelligently (so that
3864 the caller gets ECONNRESET instead of EINVAL).
3866 - Fix a bunch of bugs in the handling of clients that have existing
3867 leases when the try to renew their leases while failover is
3870 Changes since 3.0 Release Candidate 6
3872 - Fix a core dump that could happen when processing a DHCPREQUEST from
3873 a client that had a host declaration that contained both a
3874 fixed-address declaration and a dhcp-client-identifier option
3875 declaration, if the client identifier was longer than nine bytes.
3877 - Fix a memory leak that could happen in certain obscure cases when
3878 using omapi to manipulate leases.
3880 - Fix some bugs and omissions in omshell.
3882 Changes since 3.0 Release Candidate 5
3884 - Fix a bug in omapi_object_dereference that prevented objects in
3885 chains from having their reference counts decreased on dereference.
3887 - Fix a bug in omapi_object_dereference that would prevent object
3888 chains from being freed upon removal of the last reference external
3891 - Fix a number of other memory leaks in the OMAPI protocol subsystem.
3893 - Add code in the OMAPI protocol handler to trace memory leakage.
3895 - Clean up the memory allocation/reference history printer.
3897 - Support input of dotted quads and colon-separated hex lists as
3898 attribute values in omshell.
3900 - Fix a typo in the Linux interface discovery code.
3902 - Conditionalize a piece of trace code that wasn't conditional.
3904 Changes since 3.0 Release Candidate 4
3906 - Fix a bug that would prevent leases from being abandoned properly on
3909 - Fix failover peer OMAPI support.
3911 - In failover, correctly handle expiration of leases. Previously,
3912 leases would never be reclaimed because they couldn't make the
3913 transition from EXPIRED to FREE.
3915 - Fix some broken failover state transitions.
3917 - Documentation fixes.
3919 - Take out an unnecessary check in DHCP relay agent information option
3920 stashing code that was preventing REBINDING clients from rebinding.
3922 - Prevent failover peers from allocating leases in DHCPREQUEST
3923 processing if the lease belongs to the other server.
3925 - Record server version in lease file introductory comment.
3927 - Correctly report connection errors in OMAPI and failover.
3929 - Make authentication signature algorithm name comparisons in OMAPI
3932 - Fix compile problem on SunOS 4.x
3934 - If a signature algorithm is not terminated with '.', terminate it so
3935 that comparisons between fully-qualified names will work
3938 - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
3939 systems with the probe not working correctly.
3941 - Don't allow user to type omapi key on command line of omshell.
3943 Changes since 3.0 Release Candidate 3
3945 - Do lease billing on startup in a way that I *think* will finally do
3946 the billing correctly - the previous method could overbill as a
3947 result of duplicate leases.
3949 - Document OMAPI server objects.
3951 Changes since 3.0 Release Candidate 2 Patchlevel 1
3953 - Fix some problems in the DDNS update code. Thanks to Albert
3954 Herranz for figuring out the main problem.
3956 - Fix some reference counting errors on host entries that were causing
3959 - Fix a byte-swap bug in the token ring code, thanks to Jochen
3962 - Fix a bug in lease billing, thanks to Jonas Bulow.
3964 Changes since 3.0 Release Candidate 2
3966 - Change the conditions under which a DHCPRELEASE is actually
3967 committed to be consistent with lease binding states rather than
3968 using the lease end time. This may fix some problems with the
3971 - Fix a bug where lease updates would fail on Digital Unix (and maybe
3972 others) because malloc was called with a size of zero.
3974 - Fix a core dump that happens when the DHCP server can't create its
3977 Changes since 3.0 Release Candidate 1 Patchlevel 1
3979 - Fix the dhcp_failover_put_message to not attempt to allocate a
3980 zero-length buffer. Some versions of malloc() fail if you try to
3981 allocate a zero-length buffer, and this was causing problems on,
3984 - Fix a case where the failover code was printing an error message
3985 when no error had occurred.
3987 - Fix a problem where when a server went down and back up again, the
3988 peer would not see a state transition and so would stay in the
3989 non-communicating state.
3991 - Be smart about going into recover_wait.
3993 - Fix a problem in the failover implementation where peers would fail
3994 to come into sync if interrupted in the RECOVER state. This could
3995 have been the cause of some problems people have reported recently.
3997 - Fix a problem with billing classes where they would not be unbilled
3998 when the client lease expired.
4000 - If select fails, figure out which descriptor is bad, and cut it out
4001 of the I/O loop. This prevents a potentially nasty spin. I
4002 haven't heard any report it in a while, but it came up consistently
4005 - Fix a bug in the relay agent where if you specified interfaces on
4006 the command line, it would fail.
4008 - Fix a couple of small bugs in the omapi connection object (no known
4011 - Add the missing 3.0 Beta 1 lease conversion script.
4013 - Read dhcp client script hooks if they exist, rather than only if
4016 Changes since 3.0 Release Candidate 1
4018 - Fix a memory smash that happens when fixed-address leases are used.
4019 ANY SITE AT WHICH FIXED-ADDRESS STATEMENTS ARE BEING USED SHOULD
4020 UPGRADE IMMEDIATELY. This has been a long-standing bug - thanks to
4021 Alvise Nobile for discovering it and helping me to find it!
4023 - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
4026 - There is a known problem with the DHCP server doing failover on
4027 Compaq Alpha systems. This patchlevel is not a release candidate
4028 because of this bug. The bug should be straightforward to fix, so
4029 a new release candidate is expected shortly.
4031 - There is a known problem in the DDNS update code that is probably a
4032 bug, and is not, as far as we know, fixed in this patchlevel.
4034 Changes since 3.0 Beta 2 Patchlevel 24
4036 - Went over problematic failover state transitions and made them all
4037 work, so that failover should now much less fragile.
4039 - Add some dhcpctl and omapi documentation
4041 - Fix compile errors when compiling with unusual predefines.
4043 - Make Token Ring work on Linux 2.4
4045 - Fix the Digital Unix BPF_WORDALIGN bug.
4047 - Fix some dhcp client documentation errors.
4049 - Update some parts of the README file.
4051 - Support GCC on SCO.
4053 Changes since 3.0 Beta 2 Patchlevel 23
4055 - Fix a bug in the DNS update code where a status code was not being
4056 checked. This may have been causing core dumps.
4058 - When parsing the lease file, if a lease declaration includes a
4059 billing class statement, and the lease already has a billing class,
4060 unbill the old class.
4062 - When processing failover transactions, where acks will be deferred,
4063 process the state transition immediately.
4065 - Don't try to use the new SIOCGIFCONF buffer size detection code on
4066 Linux 2.0, which doesn't provide this functionality.
4068 - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
4070 - Fix a problem in using the which command in the configure script.
4072 - Fix a parse error in the client when setting up an omapi listener.
4074 - Document the -n and -g flags to the client.
4076 - Make sure there is always a stdin and stdout on startup. This
4077 prevents shell scripts from accidentally writing error messages into
4078 configuration files that happen to be opened as stderr.
4080 - If an interface is removed, the client will now notice that it is
4081 gone rather than spinning. This has only been tested on NetBSD.
4083 - The client will attempt to get an address even if it can't create a
4086 - Don't overwrite tracefiles.
4088 - Fix some memory allocation bugs in failover.
4090 Changes since 3.0 Beta 2 Patchlevel 22
4092 - Apply some patches suggested by Cyrille Lefevre, who is maintaining
4093 the FreeBSD ISC DHCP Distribution port.
4095 - Fix a core dump in DHCPRELEASE.
4097 Changes since 3.0 Beta 2 Patchlevel 21
4099 - This time for sure: fix the spin described in the changes for pl20.
4101 Changes since 3.0 Beta 2 Patchlevel 20
4103 - Fix a problem with Linux detecting large numbers of interfaces (Ben)
4105 - Fix a memory smash in the quotify code, which was introduced in
4108 - Actually fix the spin described in the changes for pl20. The
4109 previous fix only partially fixed the problem - enough to get it
4110 past the regression test.
4112 Changes since 3.0 Beta 2 Patchlevel 19
4114 - Fix a bug that could cause the server to abort if compiled with
4115 POINTER_DEBUG enabled.
4117 - Fix a bug that could cause the server to spin when responding to a
4120 - Apply Joost Mulders' suggested patches for DLPI on x86.
4122 - Support NUL characters in quoted strings.
4124 - Install unformatted man pages on SunOS.
4126 Changes since 3.0 Beta 2 Patchlevel 18
4128 - Allow the server to be placed in partner-down state using OMAPI.
4131 - Implement omshell, which can be used to do arbitrary things to the
4132 server (in theory). (Damien Neil)
4134 - Fix a case where if a client had two different leases the server could
4135 actually dereference the second one when it hadn't been referenced,
4136 leading to memory corruption and a core dump. (James Brister)
4138 - Fix a case where a client could request the address of another client's
4139 lease, but find_lease wouldn't detect that the other client had it, and
4140 would attempt to allocate it to the client, resulting in a lease conflict
4143 - Fix a case where a client with more than one client identifier could be
4144 given a lease where the hardware address was correct but the client
4145 identifier was not, resulting in a lease conflict message.
4147 - Fix a problem where the server could write out a colon-separated
4148 hex list as a value for a variable, which would then not parse.
4149 The fix is to always write strings as quoted strings, with any
4150 non-printable characters quoted as octal escape sequences. So
4151 a file written the old way still won't work, but new files written
4154 - Fix documentation for sending non-standard options.
4156 - Use unparsable names for unknown options. WARNING: this will
4157 break any configuration files that use the option-nnn convention.
4158 If you want to continue to use this convention for some options,
4159 please be sure to write a definition, like this:
4161 option option-nnn code nnn = string;
4163 You can use a descriptive name instead of option-nnn if you like.
4165 - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
4166 DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
4167 result of a deceptively silly bug in supersede_lease.
4169 - Fix client script exit status check, according to a fix supplied by
4172 - Fix an endianness bug in the tracefile support, regarding ICMP
4175 - Fix a bug in the client where the medium would not work correctly if
4176 it contained quoted strings.
4178 ** there was no pl17 **
4180 Changes since 3.0 Beta 2 Patchlevel 16
4182 - Add support for transaction tracing. This allows the state of the
4183 DHCP server on startup, and all the subsequent transactions, to be
4184 recorded in a file which can then be played back to reproduce the
4185 behaviour of the DHCP server. This can be used to quickly
4186 reproduce bugs that cause core dumps or corruption, and also for
4187 tracking down memory leaks.
4189 - Incorporate some bug fixes provided by Joost Mulders for the DLPI
4190 package which should clear up problems people have been seeing on
4193 - Fix bugs in the handling of options stored as linked lists (agent
4194 options, fqdn options and nwip options) that could cause memory
4195 corruption and core dumps.
4197 - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
4198 not being send in some cases when they were needed.
4200 - Make the lease structure somewhat more compact.
4202 - Make initial failover startup *much* faster. This was researched
4203 and implemented by Damien Neil.
4205 - Add a --version flag to all executables, which prints the program
4206 name and version to standard output.
4208 - Don't rewrite the lease file every thousand leases.
4210 - A bug in nit.c for older SunOS machines was fixed by a patch sent in
4211 by Takeshi Hagiwara.
4213 - Fix a memory corruption bug in the DHCP client.
4215 - Lots of documentation updates.
4217 - Add a feature allowing environment variables to be passed to the
4218 DHCP client script on the DHCP client command line.
4220 - Fix client medium support, which had been broken for some time.
4222 - Fix a bug in the DHCP client initial startup backoff interval, which
4223 would cause two DHCPDISCOVERS to be sent back-to-back on startup.
4225 Changes since 3.0 Beta 2 Patchlevel 15
4227 - Some documentation tweaks.
4229 - Maybe fix a problem in the DLPI code.
4231 - Fix some error code space inconsistencies in ddns update code.
4233 - Support relay agents that intercept unicast DHCP messages to stuff
4234 agent options into them.
4236 - Fix a small memory leak in the relay agent option support code.
4238 - Fix a core dump that would occur if a packet was sent with no
4241 Changes since 3.0 Beta 2 Patchlevel 14
4243 - Finish fixing a long-standing bug in the agent options code. This
4244 was causing core dumps and failing to operate correctly - in
4245 particular, agent option stashing wasn't working. Agent option
4246 stashing should now be working, meaning that agent options can be
4247 used in class statements to control address allocation.
4249 - Fix up documentation.
4251 - Fix a couple of small memory leaks that would have added up
4252 significantly in a high-demand situation.
4254 - Add a log-facility configuration parameter.
4256 - Fix a compile error on some older operating systems.
4258 - Add the ability in the client to execute certain statements before
4259 transmitting packets to the server. Handy for debugging; not much
4260 practical use otherwise.
4262 - Don't send faked-out giaddr when renewing or bound - again, useful
4265 Changes since 3.0 Beta 2 Patchlevel 13
4267 - Fixed a problem where the fqdn decoder would sometimes try to store
4268 an option with an (unsigned) negative length, resulting in a core
4269 dump on some systems.
4271 - Work around the Win98 DHCP client, which NUL-terminates the FQDN
4274 - Work around Win98 and Win2k clients that will claim they want to do
4275 the update even when they don't have any way to do it.
4277 - Fix some log messages that can be printed when failover is operating
4278 that were not printing enough information.
4280 - It was possible for a DHCPDISCOVER to get an allocation even when
4281 the state machine said the server shouldn't be responding.
4283 - Don't load balance DHCPREQUESTs from clients in RENEWING and
4284 REBINDING, since in RENEWING, if we heard it, it's for us, and in
4285 REBINDING, the client wouldn't have got to REBINDING if its primary
4288 - When we get a bogus state lease binding state transition, don't do
4292 Changes since 3.0 Beta 2 Patchlevel 12
4294 - Fixed a couple of silly compile errors.
4296 Changes since 3.0 Beta 2 Patchlevel 11
4298 - Albert Herranz tracked down and fixed a subtle bug in the base64
4299 decoder that would prevent any key with an 'x' in its base64
4300 representation from working correctly.
4302 - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
4303 hang that they both spotted in the DHCP server - when
4304 one-lease-per-client was set, the code to release the "other" lease
4307 - Fix a problem with alignment of the input buffer in bpf in cases
4308 where two packets arrive in the same bpf read.
4310 - Fix a problem where the relay agent would crash if you specified an
4311 interface name on the command line.
4313 - Add the ability to conditionalize client behaviour based on the
4316 - Add support for the FQDN option, and added support for a new way of
4317 doing ddns updates (ddns update style interim) that allows more than
4318 one DHCP server to update the DNS for the same network(s). This
4319 was implemented by Damien Neil with some additional functionality
4322 - Damien added a "log" statement, so that the configuration file can
4323 be made to log debugging information and other information.
4325 - Fixed a bug that caused option buffers not to be terminated with an
4328 - Fixed a long-standing bug in the support for option spaces where the
4329 options are stored as an ordered list rather than in a hash table,
4330 which could theoretically result in memory pool corruption.
4332 - Prevent hardware declarations with no actual hardware address from
4333 being written as something unparsable, and behave correctly in the
4334 face of a null hardware address on input.
4336 - Allow key names to be FQDNs, and qualify the algorithm name if it is
4337 specified unqualified.
4339 - Modify the DDNS update code so that it never prints the "resolver
4340 failed" message, but instead says *why* the resolver failed.
4342 - Officially support the subnet selection option, which now has an
4345 - Fix a build bug on MacOS X.
4347 - Allow administrator to disable ping checking.
4349 - Clean up dhcpd.conf documentation and add more information about how
4352 Changes since 3.0 Beta 2 Patchlevel 10
4354 - Fix a bug introduced during debugging (!) and accidentally committed
4357 Changes since 3.0 Beta 2 Patchlevel 9
4359 - Fix DHCP client handling of vendor encapsulated options.
4361 - Fix a bug in the handling of relay agent information options introduced
4364 - Stash agent options on client leases by default, and use the stashed
4365 options at renewal time.
4367 - Add the ability to test the client's binding state in the client
4368 configuration language.
4370 - Fix a core dump in the DNS update code.
4372 - Fix some expression evaluation bugs that were causing updates to be
4373 done when no client hostname was received.
4375 - Fix expression evaluation debugging printfs.
4377 - Teach pretty_print_option to print options in option spaces other than
4378 the DHCP option space.
4380 - Add a warning message if the RHS of a not is not boolean.
4382 - Never select for more than a day, because some implementations of
4383 select will just fail if the timeout is too long (!).
4385 - Fix a case where a DHCPDISCOVER from an unknown network would be
4388 - Fix a bug where if a client requested an IP address for which a different
4389 client had the lease, the DHCP server would reallocate it anyway.
4391 - Fix the DNS update code so that if the client changes its name, the DNS
4392 will be correctly updated.
4394 Changes since 3.0 Beta 2 Patchlevel 8
4396 - Oops, there was another subtle math error in the header-length
4399 Changes since 3.0 Beta 2 Patchlevel 7
4401 - Oops, forgot to byte-swap udp header length before bounds-checking it.
4403 Changes since 3.0 Beta 2 Patchlevel 6
4405 - Fix a possible DoS attack where a client could cause the checksummer
4406 to dump core. This was a read, not a write, so it shouldn't be
4407 possible to exploit it any further than that.
4409 - Implement client- and server-side support for using the Client FQDN
4412 - Support for other option spaces in the client has been added. This
4413 means that it is now possible to define a vendor option space on the
4414 client, request options in that space from the server (which must
4415 define the same option space), and then use those options in the
4416 client. This also allows NWIP and Client FQDN options to be used
4419 - Add object initializer support. This means that objects can now be
4420 initialized to something other than all-zeros when allocated, which
4421 makes, e.g., the interface object support code a little more robust.
4423 - Fix an off-by-one bug in the host stuffer. This was causing host
4424 deletes not the work, and may also have been causing OMAPI
4425 connections to get dropped. Thanks to James Brister for tracking
4428 - Fixed a core dump in the interface discovery code that is triggered
4429 when there is no subnet declaration for an interface, but the server
4430 decides to continue running. Thanks to Shane Kerr for tracking
4431 down and fixing this problem.
4433 Changes since 3.0 Beta 2 Patchlevel 5
4435 - Fix a bug in the recent enhancement to the interface discovery code
4436 to support arbitrary-length interface lists.
4438 - Support NUL-terminated DHCP options when initializing client-script
4441 - Fix suffix operator.
4443 - Fix NetWare/IP option parsing.
4445 - Better error/status checking in dhcpctl initialization and omapi
4448 - Fix a potential memory smash in dhcpctl code.
4450 - Fix SunOS4 and (maybe) Ultrix builds.
4452 - Fix a bug where a certain sort of incoming packet could cause a core
4453 dump on Solaris (and probably elsewhere).
4455 - Add some more safety checks in error logging code.
4457 - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
4459 - Fix relay agent so that if an interface is specified on the command
4460 line, the relay agent does not dump core.
4462 - Fix class matching so that match if can be combined with match or
4465 - Do not allow spurious leases in the lease database to introduce
4466 potentially bogus leases into the in-memory database.
4468 - Fix a byte-order problem in the client hardware address type code
4471 - Be slightly less picky about what sort of hardware addresses OMAPI
4472 can install in host declarations.
4474 Changes since 3.0 Beta 2 Patchlevel 4
4476 - Incorporated Peter Marschall's proposed change to array/record
4477 parsing, which allows things like the slp-agent option to be encoded
4478 correctly. Thanks very much to Peter for taking the initiative to
4479 do this, and for doing such a careful job of it (e.g., updating the
4482 - Added an encoding for the slp-agent option. :')
4484 - Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
4485 request for help on this with patches!
4487 - Incorporated a change that should fix a problem reported by Philippe
4488 Jumelle where when the network connection between two servers is
4489 lost, they never reconnect.
4491 - Fix client script files other than that for NetBSD to actually use
4492 make_resolv_conf as documented in the manual page.
4494 - Fix a bug in the packet handling code that could result in a core
4497 - Fix a bug in the bootp code where responses on the local net would
4498 be sent to the wrong MAC address. Thanks to Jerry Schave for
4501 Changes since 3.0 Beta 2 Patchlevel 3
4503 - In the DHCP client, execute client statements prior to using the values
4504 of options, so that the client configuration can overridden, e.g., the
4507 - Fix a reference counting error that would result in very reproducible
4508 failures in updates, as well as occasional core dumps, if a zone was
4509 declared without a key.
4511 - Fix some Linux 2.0 compilation problems.
4513 - Fix a bug in scope evaluation during execution of "on" statements that
4514 caused values not to be recorded on leases.
4516 - If the dhcp-max-message-size option is specified in scope, and the
4517 client didn't send this option, use the one specified in scope to
4518 determine the maximum size of the response.
4520 Changes since 3.0 Beta 2 Patchlevel 2
4522 - Fix a case where spawning subclasses were being allocated
4523 incorrectly, resulting in a core dump.
4525 - Fix a case where the DHCP server might inappropriately NAK a
4528 - Fix a place dhcprequest() where static leases could leak.
4530 - Include memory.h in omapip_p.h so that we don't get warnings about
4533 Changes since 3.0 Beta 2 Patchlevel 1
4535 - Notice when SIOCFIGCONF returns more data than fit in the buffer -
4536 allocate a larger buffer, and retry. Thanks to Greg Fausak for
4539 - In the server, if no interfaces were configured, report an error and
4542 - Don't ever record a state of 'startup'.
4544 - Don't try to evaluate the local failover binding address if none was
4545 specified. Thanks to Joseph Breu for finding this.