1 Internet Systems Consortium DHCP Distribution
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 suppport 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).
57 - Corrected parser's right brace matching when a statement contains an error.
60 - TSIG-authenticated dynamic DNS updates now support the use of these
61 additional algorithms: hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384,
65 - Added check for invalid failover message type. Thanks to Tobias Stoeckmann
66 working with the OpendBSD project who spotted the issue and provided the
70 - Corrected rate limiting checks for bad packet logging. Thanks to Tobias
71 Stoeckmann working with the OpendBSD project who spotted the issue and
75 - Log statements depicting what files will be used by the server now occur
76 after the configuration file has been processed.
79 - Addressed Coverity issues reported as of 07-31-2014:
80 [ISC-Bugs #36712] Corrects Coverity reported "high" impact issues.
81 [ISC-Bugs #36933] Corrects Coverity reported "medium" impact issues
82 [ISC-Bugs #37708] Fixes compilation error in dst_api.c seen in older
83 compilers that was introduced by #36712
85 - Server now supports a failover split value of 256.
88 - Remove unneeded error #defines. These defines were included in case
89 external programs required the older versions of the macro. They
90 have been #ifdeffed for now and will be removed at a future date.
91 See site.h for the #define to include them again, but you should
92 switch to using the DHCP_R_* versions instead of the ISC_R_* versions.
93 Also ISC_R_MULTIPLE has been removed as it is also deifned in bind.
96 - Added checks in range6 and prefix6 statement parsing to ensure addresses
97 are within the declared. Thanks to Jiri Popelka at Red Hat for the bug
105 - Addressed checksum issues:
106 Added checksum readiness check to Linux packet filtering which eliminates
107 invalid packet drops due to checksum errors when checksum offloading is
108 in use. Based on dhcp-4.2.2-xen-checksum.patch made to the Fedora project.
115 Inbound packets with UPD checksums of 0xffff now validate correctly rather
120 - Added the echo-client-id configuration parameter to the server configuration.
121 The server now supports RFC 6842 compliant behavior by setting a new
122 configuration parameter, echo-client-id. When enabled, the server will
123 include the client identifier option (Option code 61) if received, in its
124 responses. The server identifier returned in NAKs (if enabled) will now
125 be the globally defined value (if one) if the server cannot attribute the
126 inbound request to a known subnet.
130 - Added support of the configuration parameter, use-host-decl-names, to
131 BOOTP request handling.
134 - Added logic to ignore the signal, SIGPIPE, which ensures write failures
135 will be delivered as errors rather than as SIGPIPE signals on all OSs.
136 Thanks to Marius Tomaschewski from SUSE who reported the issue and provided
137 the patch upon which the fix is based.
140 - In the failover code, handle the case of communications being interrupted
141 when the servers are dealing with POTENTIAL-CONFLICT. This patch allows
142 the primary to accept the secondary moving from POTENTIAL-CONFLICT to
143 RESOLUTION-INTERRUPTED as well as handling the bind update process better.
144 In addition the code to resend update or update all requests has been
145 modified to send requests more often.
149 Changes since 4.3.1b1
151 - Modify the linux and openwrt dhclient scripts to process information
152 from a stateless request. Thanks to Jiri Popelka at Red Hat for the
153 bug report and patch.
156 - Remove more unused RCSID tags. These weren't noticed in 4.3 as
157 the code isn't used anymore but we remove them here to keep the
158 code consistent across versions.
163 - Tidy up several small tickets.
164 Correct parsing of DUID from config file, previously the LL type
165 was put in the wrong place in the DUID string.
167 Add code to parse "do-forward-updates" as well as "do-forward-update"
168 Thanks to Jiri Popelka at Red Hat.
170 Remove log_priority as it isn't currently used.
172 Increase the size of the buffer used for reading interface information.
175 - Remove an extra set of the msg_controllen variable.
178 - Add a more understandable error message if a configuration attempts
179 to add multiple keys for a single zone. Thanks to a patch from Jiri
183 - Fix some minor issues in the dst code.
186 - Properly #ifdef functions so that the code can compile without NSUPDATE.
189 - Update the partner's stos (start time of state, basically when we last
190 heard from this partner) field when updating the state in failover.
193 - Modify the overload processing to allow space for the remote agent ID.
195 Handle the ordering of the SUBNET_MASK option even if it is the last
199 - Remove the code that allows a server to follow RFC3315 instead of
200 the subsequent errata from August 2010 when determining which IAs
201 to include if no addresses will be assigned.
204 - Remove unused RCSID tags.
207 - Correct the v6 client timing code. When doing the timing backoff
208 for MRT limit it to MRD.
209 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
212 - Add a log entry when killing a client and remove the PID files
213 when a server, relay or client are killed.
217 - Some minor cleanups in the client code.
218 In addition to checking for dhcpc check for bootpc in the services list.
220 Correct the client code to only try to get a lease once when the
221 given the "-1" argument.
222 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
224 When asked for the version don't send the output to syslog.
226 Add the next server information to the environment variables for
227 use by the client script. In order to avoid changing the client
228 lease file the next server information isn't written to it.
229 Thanks to Tomas Hozza at Red Hat for the suggestion and a prototype fix.
232 - Several updates to the dhcp server code.
233 When not in quiet mode print out the files being used.
235 As accessing some pid files may require privileges move the dropping
236 of permission bits due to the paranoia patch to be after the pid code.
237 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
239 When processing a "--version" request don't output the version information
242 - Add the "enable-log-pid" build option to the configure script. When enabled
243 this causes the client, server and relay programs to include the PID
244 number in syslog messages.
245 Thanks to Marius Tomaschewski for the suggestion and proto-patch.
248 - Add a #define to specify the prefix length used when a client attempts
249 to configure an address. This can be modified by editing includes/site.h.
250 By default it is set to 64. While 128 might be a better choice it would
251 also be a change for currently running systems, so we have left it at 64.
254 - Add a run time option to the client "-df" to allow the administrator to
255 point to a second lease file the client can search for a DUID. This can
256 be used to allow a v4 and a v6 instance of the client to share a DUID.
257 The second file will only be searched if there isn't a DUID in the main
258 lease file and the DUID will be written out to the main lease file.
261 - Have the client fsync the lease file to avoid lease corruption if the
262 client hibernates or otherwise shuts down.
265 - Add a check for L2VLAN in bpf.c to help support VLAN interfaces
266 Thanks to Steinar Haug for the suggestion.
269 - Modify the handling of the resolv.conf file to allow the DHCP
270 process to start up even if the resolv.conf file has problems.
273 - Add threshold logging functionality. Two new options,
274 log-threshold-low and log-threshold-high, indicate to the
275 server if and when it should log an error message as addresses
279 - Add code to properly dereference a pointer in the dhclient code
280 on an error condition.
283 - Add code to help clean up soft leases.
286 - Disable the gentle shutdown functionality until we can determine
287 the best way to present it to remove or reduce the side effects.
290 Changes since 4.3.0rc1
293 Changes since 4.3.0b1
295 - Tidy up receive packet processing.
296 Thanks to Brad Plank of GTA for reporting the issue and suggesting
300 Changes since 4.3.0a1
302 - Modify the message displayed when a process hits a fatal error.
303 The new message is much shorter and simply points to the README
304 and our website for directions on bug submissions.
307 - Handle an absent resolv.conf file better.
310 Changes since 4.2.0 (new features)
312 - If a client renews before 'dhcp-cache-threshold' percent of its lease
313 has elapsed (default 25%), the server will reuse the allocated lease
314 (provide a lease within the currently allocated lease-time) rather
315 than extend or renew the lease. This absolves the server of needing
316 to perform an fsync() operation on the lease database before reply,
317 which improves performance. [ISC-Bugs #22228]
318 Updated this patch to support asynchronous DDNS. If the server is
319 attempting to do DDNS on a lease it should be udpated and written to
320 disk even if that wouldn't be necessary due to the thresholding.
323 - The 'no available billing' log line now also logs the name of the last
324 matching billing class tried before failing to provide a billing.
327 - A problem with missing get_hw_addr function when --enable-use-sockets
328 was used is now solved on GNU/Linux, BSD and GNU/Hurd systems. Note
329 that use-sockets feature was not tested on those systems. Client and
330 server code no longer use MAX_PATH constant that is not defined on
331 GNU/Hurd systems. [ISC-Bugs #25979]
333 - Add a perl script in the contrib directory, dhcp-lease-list.pl, which
334 can parse v4 lease files and output the lease information in a more
335 human friendly manner. This was written by Christian Hammers with
336 some updates by vom and ISC. This is contributed code and is not
337 supported by ISC; however it may be useful to some users.
340 - Add support in v6 for on-commit, on-expire and on-release.
343 - Add support for using classes with v6.
346 - Update the DDNS code to current standards and allow for sharing
347 of DDNS entries between v4 and v6 clients. The new code is used
348 if the ddns-update-style is set to "standard", the older code is
349 still available if ddns-update-style is set to "interim". The
350 oldest DDNS code "ad-hoc" has been removed. Thanks to Thomas Pegeot
351 who submitted a patch for this issue. This patch is based on
352 that work with some modifications.
355 - Add a configuration option to the server to suppress using fsync().
356 Enabling this option will mean that fsync() is never called. This
357 may provide better performance but there is also a risk that a lease
358 will not be properly written to the disk after it has been issued
359 to a client and before the server stops. Using this option is
363 - Add some logging statements to indicate when the server is ready
364 to serve. One statement is emitted after the server has finished
365 reading its files and is about to enter the dispatch loop.
366 This is "Server starting service.".
367 The second is emitted when a server determines that both it and
368 its failover peer are in the normal state.
369 This is "failover peer <name>: Both servers normal."
372 - Add support for accessing options from v6 relays. The v6relay
373 statement allows the administrator to choose which relay to
374 use when searching for an option, see the dhcp-options man page
375 for a description. The host-identifier option has also been
376 updated to support the use of relay options, see the dhcpd.conf
377 man page for a description.
380 - When doing DDNS if there isn't an appropriate zone statement attempt
381 to find a reasonable nameserver via a DNS resolver. This restores
382 some functionality that was lost in the transition to asynchronous
383 DDNS. Due to the lack of security and increase in fragility of the
384 system when using this feature we strongly recommend the use of
385 appropriate zone statements rather than using this functionality.
388 - Add support for specifying the address from which to send
389 DDNS updates on the DHCP server. There are two new options
390 "ddns-local-address4" and "ddns-local-address6" that each take
391 one instance of their respective address types.
394 - Add ignore-client-uids option in the server. This option causes
395 the server to not record a client's uid in its lease. This
396 violates the specification but may also be useful when a client
397 can dual boot using different client ids but the same mac address.
398 Thank you to Brian De Wolf at Cal Poly Pomona for the patch.
402 - Extend the DHCPINFORM processing to honor the subnet selection option
403 and take host declarations into account.
404 Thanks to Christof Chen for testing and submitting the patch.
407 - Extend the hardware expression to look into the lease structure
408 for a hardware address if there is no packet. This allows the
409 server to find the hardware address during on-expiry processing.
412 - Add definitions for some options that have been specified by the IETF.
416 Changes since 4.2.0 (bug fixes)
418 - When using 'ignore client-updates;', the FQDN returned to the client
419 is no longer truncated to one octet.
421 - Cleaned up an unused hardware address variable in nak_lease().
423 - Manpage entries for the ia-pd and ia-prefix options were updated to
424 reflect support for prefix delegation.
426 - Cleaned up some compiler warnings
428 - An optimization described in the failover protocol draft is now included,
429 which permits a DHCP server operating in communications-interrupted state
430 to 'rewind' a lease to the state most recently transmitted to its peer,
431 greatly increasing a server's endurance in communications-interrupted.
432 This is supported using a new 'rewind state' record on the dhcpd.leases
433 entry for each lease.
435 - Fix the trace code which was broken by the changes to the DDNS code.
437 - Update the fsync code to work with the changes to the DDNS code. It now
438 uses a timer instead of noticing if there are no more packets to process.
440 - When constructing the DNS name structure from a text string append
441 the root to relative names. This satisfies a requirement in the DNS
442 library that names be absolute instead of relative and prevents DHCP
443 from crashing. [ISC-Bugs #21054]
445 - "The LDAP Patch" that has been circulating for some time, written by
446 Brian Masney and S.Kalyanasundraram and maintained for application to
447 the DHCP-4 sources by David Cantrell has been included. Please be
448 advised that these sources were contributed, and do not yet meet the
449 high standards we place on production sources we include by default.
450 As a result, the LDAP features are only included by using a compile-time
451 option which defaults off, and if you enable it you do so under your
452 own recognizance. We will be improving this software over time.
455 - Prohibit including lease time information in a response to a DHCP INFORM.
458 ! Accept a client id of length 0 while hashing. Previously the server would
459 exit if it attempted to hash a zero length client id, providing attackers
460 with a simple denial of service attack. [ISC-Bugs #21253]
461 CERT: VU#541921 - CVE: CVE-2010-2156
463 - A memory leak in ddns processing was closed. [ISC-Bugs #21377]
465 - Modify the exception handling for initial context creation. Previously
466 we would try and clean up before exiting. This could present problems
467 when the cleanup required part of the context that wasn't available. It
468 also didn't do much as we exited afterwards anyway. Now we simply log
469 the error and exit. [ISC-Bugs #21093]
471 - A bug was fixed that could cause the DHCPv6 server to advertise/assign a
472 previously allocated (active) lease to a client that has changed subnets,
473 despite being on different shared networks. Dynamic prefixes specifically
474 allocated in shared networks also now are not offered if the client has
475 moved. [ISC-Bugs #21152]
477 - Add some debugging output for use with the DDNS code. [ISC-Bugs #20916]
479 - Fix the trace code to handle timing events better and to truncate a file
480 before using instead of overwriting it. [ISC-Bugs #20969]
482 - Modify the determination of the default TTL to use for DDNS updates.
483 The user may still configure the ttl via ddns-ttl. The default for
484 both v4 and v6 is now 1/2 the (preferred) lease time with a limit. The
485 previous defaults (1/2 lease time without a limit for v4 and a default
486 value for v6) may be used by defining USE_OLD_DDNS_TTL in site.h
489 - libisc/libdns is now brought up to version 9.7.1rc1. This corrects
490 three reported flaws in ISC DHCP;
492 o DHCP processes (dhcpd, dhclient) fail to start if one of either the
493 IPv4 or IPv6 address families is not present. [ISC-Bugs #21122]
495 o Assertion failure when attempting to cancel a previously running DDNS
496 update. [ISC-Bugs #21133]
498 o Compilation failure of libisc/libdns due to the use of a flexible
499 array member. [ISC-Bugs #21316]
501 - Add declaration for variable in debug code in alloc.c. [ISC-Bugs #21472]
503 - Documentation cleanup covering multiple tickets
504 [ISC-Bugs #20265] [ISC-Bugs #20259] minor cleanup
505 [ISC-Bugs #20263] add text describing some default values
506 [ISC-Bugs #20193] single quotes at the start of a line indicate a control
507 line to nroff, escape them if we actually want a quote.
508 [ISC-Bugs #18916] sync the pointer to web pages amongst the different docs
510 - 'get-host-names true;' now also works even if 'use-host-decl-names true;'
511 was also configured. The nature of this repair also fixes another
512 error; the host-name supplied by a client is no longer overridden by a
513 reverse lookup of the lease address. Thanks to a patch from Wilco Baan
514 Hofman supplied to us by the Debian package maintenance team.
515 [ISC-Bugs #21691] {Debian Bug#509445}
517 - The .TH tag for the dhcp-options manpage was typo repaired
518 thanks to a report from jidanni and the Debian package maintenance
519 team. [ISC-Bugs #21676] {Debian Bug#563613}
521 - More documentation changes - primarily to put the options in the dhclient
522 and dhcpd man pages into the standard form. Thanks in part to a patch
523 from David Cantrell at Red Hat.
524 [ISC-Bugs #20264] and parts of [ISC-Bugs #17744] dhclient.8 changes
526 - Add code to clear the pointer to an object in an OMAPI handle when the
527 object is freed due to a dereference. [ISC-Bugs #21306]
529 - Fixed a bug that leaks host record references onto lease structures,
530 causing the server to apply configuration intended for one host to any
531 other innocent clients that come along later. [ISC-Bugs #22018]
534 [ISC-Bugs #19566] When trying to find the zone for a name for ddns allow
535 the name to be at the apex of the zone.
536 [ISC-Bugs #19617] Restrict length of interface name read from command line
537 in dhcpd - based on a patch from David Cantrell at Red Hat.
538 [ISC-Bugs #20039] Correct some error messages in dhcpd.c
539 [ISC-Bugs #20070] Better range check on values when creating a DHCID.
540 [ISC-Bugs #20198] Avoid writing past the end of the field when adding
541 overly long file or server names to a packet and add a log message
542 if the configuration supplied overly long names for these fields.
543 Thanks to Martin Pala.
544 [ISC-Bugs #21497] Add a little more randomness to rng seed in client
545 thanks to a patch from Jeremiah Jinno.
547 - Correct error handling in DLPI [ISC-Bugs #20378]
549 - Remove __sun__ and __hpux__ typedefs in osdep.h as they are now being
550 checked in configure. [ISC-Bugs #20443]
552 - Modify how the cmsg header is allocated the v6 send and received routines
553 to compile on more compilers. [ISC-Bugs #20524]
555 - When parsing a domain name free the memory for the name after we are
556 done with it. [ISC-Bugs #20824]
558 - Add an elapsed time option to the release message and refactor the
559 code to move most of the common code to a single routine.
562 - Two identical log messages for commit_leases() have been disambiguated.
565 - Parse date strings more properly - the code now handles semi-colons in
566 date strings correctly. Thanks to a patch from Jiri Popelka at Red Hat.
567 [ISC-Bugs #21501, #20598]
569 - Fixes to lease input and output.
570 [ISC-Bugs #20418] - Some systems don't support the "%s" argument to
571 strftime, paste together the same string using mktime instead.
572 [ISC-Bugs #19596] - When parsing iaid values accept printable
574 [ISC-Bugs #21585] - Always print time values in omshell as hex
575 instead of ascii if the values happen to be printable characters.
577 - Minor changes for scripts, configure.ac and Makefiles
578 [ISC-Bugs #19147] Use domain-search instead of domain-name in manual and
579 example conf file. Thanks to a patch from David Cantrell
581 [ISC-Bugs #19761] Restore address when doing a rebind in DHCPv6
582 [ISC-Bugs #19945] Properly close the quote on some arguments.
583 [ISC-Bugs #20952] Add 64 bit types to configure.ac
584 [ISC-Bugs #21308] Add "PATH=" to CLIENT_PATH envrionment variable
586 - Update the code to parse dhcpv6 lease files to accept a semi-colon at
587 the end of the max-life and preferred-life clauses. In order to be
588 backwards compatible with older lease files not finding a semi-colon
589 is also accepted. [ISC-Bugs #22303].
591 ! Handle a relay forward message with an unspecified address in the
592 link address field. Previously such a message would cause the
593 server to crash. Thanks to a report from John Gibbons. [ISC-Bugs #21992]
594 CERT: VU#102047 CVE: CVE-2010-3611
596 - ./configure on longer searches for -lcrypto to explicitly link against.
597 This fixes a bug where 'dhclient' would have shared library dependencies
598 on '/usr/lib'. [ISC-Bugs #21967]
600 - Handle pipe failures more gracefully. Some OSes pass a SIGPIPE
601 signal to a process and will kill the process if the signal isn't
602 caught. This patch adds code to turn off the SIGPIPE signal via
603 a setsockopt() call. The signal is already being ignored as part
604 of the ISC library. [ISC-Bugs #22269]
606 - Restore printing of values in omshell to the style pre 21585. For
607 21585 we changed the print routines to always display time values
608 as a hex list. This had a side effect of printing all data strings
609 as a hex list. We shall investigate other ways of displaying time
610 values more usefully. [ISC-Bugs #22626]
612 ! Fix the handling of connection requests on the failover port.
613 Previously a connection request from a source that wasn't
614 listed as a failover peer would cause the server to become
615 non-responsive. Thanks to a report from Brad Bendily, brad@bendily.com.
617 CERT: VU#159528 CVE: CVE-2010-3616
619 - Don't pass the ISC_R_INPROGRESS status to the omapi signal handlers.
620 Passing it through to the handlers caused the omshell program to fail
621 to connect to the server. [ISC-Bugs #21839]
623 - Fix the paranthesis in the code to process configuration statements
624 beginning with "auth". The previous arrangement caused
625 "auto-partner-down" to be processed incorrectly. [ISC-Bugs #21854]
627 - Limit the timeout period allowed in the dispatch code to 2^^32-1 seconds.
628 Thanks to a report from Jiri Popelka at Red Hat.
629 [ISC-Bugs #22033], [Red Hat Bug #628258]
631 - When processing the format flags for a given option consume the
632 flag indicating an optional value correctly. A symptom of this
633 bug was an infinite loop when trying to parse the slp-service-scope
634 option. Thanks to a patch from Marius Tomaschewski.
637 - Disable the use of kqueue in the ISC library. This avoids a problem
638 between the fork and socket code that caused the dhcpd process to
639 use all available cpu if the program daemonized itself.
642 ! When processing a request in the DHCPv6 server code that specifies
643 an address that is tagged as abandoned (meaning we received a
644 decline request for it previously) don't attempt to move it from
645 the inactive to active pool as doing so can result in the server
646 crashing on an assert failure. Also retag the lease as active
647 and reset its timeout value.
650 - Removed the restriction on using IPv6 addresses in IPv4 mode. This
651 allows IPv4 options which contain IPv6 addresses to be specified. For
652 example the 6rd option can be specified and used like this:
655 option 6rd code 212 = { integer 8, integer 8,
656 ip6-address, array of ip-address };
657 option 6rd 16 10 2001:: 1.2.3.4, 5.6.7.8;
659 - Handle some DDNS corner cases better. Maintain the DDNS transaction
660 information when updating a lease and cancel any existing transactions
661 when removing the ddns information.
664 - Some fixes for LDAP
665 [ISC-Bugs #21783] - Include lber library when building ldap
666 [ISC-Bugs #22888] - Enable the ldap code when buidling common
667 The above fixes are from Jiri Popelka at Red Hat.
669 - Modify the dlpi code to accept getmsg() returning a positive value.
672 ! In dhclient check the data for some string options for
673 reasonableness before passing it along to the script that
674 interfaces with the OS.
678 - DHCPv6 server now responds properly if client asks for a prefix that
679 is already assigned to a different client. [ISC-Bugs #23948]
681 - Add the option "--no-pid" to the client, relay and server code,
682 to disable writing a pid file. Add the option "-pf pidfile"
683 to the relay to allow the user to supply the pidfile name at
684 runtime. Add the "with-relay6-pid-file" option to configure
685 to allow the user to supply the pidfile name for the relay
686 in v6 mode at configure time.
687 [ISC-Bugs #23351] [ISC-Bugs #17541]
689 - 'dhclient' no longer waits a random interval after first starting up to
690 begin in the INIT state. This conforms to RFC 2131, but elects not to
691 implement a 'SHOULD' direction in section 4.1. The goal of this change
692 is to start up faster. [ISC-Bugs #19660]
694 - Added 'initial-delay' parameter that specifies maximum amount of time
695 before client goes to the INIT state. The default value is 0. In previous
696 versions of the code client could wait up to 5 seconds. The old behavior
697 may be restored by using 'initial-delay 5;' in the client config file.
700 - ICMP ping-check should now sit closer to precisely the number of seconds
701 configured (or default 1), due to making use of the new microsecond
702 scale timer internally to dhcpd. This corrects a bug where the server
703 may immediately timeout an ICMP ping-check if it was made late in the
704 current second. [ISC-Bugs #19660]
706 - The DHCP client will schedule renewal and rebinding events in
707 microseconds if the DHCP server provided a lease-time that would result
708 in sub-1-second timers. This corrects a bug where a 2-second or lower
709 lease-time would cause the DHCP client to enter an infinite loop by
710 scheduling renewal at zero seconds. [ISC-Bugs #19660]
712 - Client lease records are recorded at most once every 15 seconds. This
713 keeps the client from filling the lease database disk quickly on very small
714 lease times. [ISC-Bugs #19660]
716 - To defend against RFC 2131 non-compliant DHCP servers which fail to
717 advertise a lease-time (either mangled, or zero in value) the DHCP
718 client now adds the server to the reject list ACL and returns to INIT
719 state to hopefully find an RFC 2131 compliant server (or retry in INIT
720 forever). [ISC-Bugs #19660]
722 - Parameters configured to evaluate from user defined function calls can
723 now be correctly written to dhcpd.leases (as on 'on events' or dynamic
724 host records inserted via OMAPI). [ISC-Bugs #22266]
726 - If a 'next-server' parameter is configured in a dynamic host record via
727 OMAPI as a domain name, the syntax written to disk is now correctly parsed
728 upon restart. [ISC-Bugs #22266]
730 - The DHCP server now responds to DHCPLEASEQUERY messages from agents using
731 IP addresses not covered by a subnet in configuration. Whether or not to
732 respond to such an agent is still governed by the 'allow leasequery;'
733 configuration parameter, in the case of an agent not covered by a configured
734 subnet the root configuration area is examined. Server now also returns
735 vendor-class-id option, if client sent it. [ISC-Bugs #21094]
737 - Documentation fixes
738 [ISC-Bugs #17959] add text to AIX section describing how to have it send
739 responses to the all-ones address.
740 [ISC-Bugs #19615] update the includes in dhcpctl/dhcpctl.3 to be more correct
741 [ISC-Bugs #20676] update dhcpd.conf.5 to include the RFC numbers for DDNS
743 - Relay no longer crashes, when DHCP packet is received over interface without
744 any IPv4 address assigned. Also extended logging message about discarding
745 packets with invalid hlen with information about relevant interface name.
748 - Relay now properly logs that packet was received over interface without
749 global IPv6 address [ISC-Bugs #24070]
751 - Linux Packet Filter interface improvement. sockaddr_pkt structure is used,
752 rather than sockaddr. Packet ethertype is now forced to ETH_P_IP.
755 - Minor code cleanups - but note port change for #23196
756 [ISC-Bugs #23470] - Modify when an ignore return macro is defined to
757 handle unsed error return warnings for more versions of gcc.
758 [ISC-Bugs #23196] - Modify the reply handling in the server code to
759 send to a specified port rather than to the source port for the incoming
760 message. Sending to the source port was test code that should have
761 been removed. The previous functionality may be restored by defining
762 REPLY_TO_SOURCE_PORT in the includes/site.h file. We suggest you don't
763 enable this except for testing purposes.
764 [ISC-Bugs #22695] - Close a file descriptor in an error path.
765 [ISC-Bugs #19368] - Tidy up variable types in validate_port.
767 - Code cleanup: remove obsolete PROTO, KandR, INLINE and ANSI_DECL macros
770 - Compilation problem with gcc4.5 and omshell.c resolved. [ISC-Bugs #23831]
772 - Client Script fixes
773 [ISC-Bugs #23045] Typos in client/scripts/openbsd
774 [ISC-Bugs #23565] In the client scripts add a zone id (interface id) if
775 the domain search address is link local.
776 [ISC-Bugs #1277] In some of the client scripts add code to handle the
777 case of the default router information being changed without the address
780 - Documentation cleanup
781 [ISC-Bugs #23326] Updated References document, several man page updates
783 - Server no longer complains about NULL pointer when configured
784 server-identifier expression fails to evaluate. [ISC-Bugs #24547]
786 - Convert ISC_R_INPROGRESS status to ISC_R_SUCCESS when called from other
787 than the dispatch handler. This fixes an issue where omshell, when
788 run from the same platform as the server, would appear to fail to
789 connect. This is a companion to #21839. [ISC-Bugs #23592]
791 - Enlarge the buffer size used by the Omshell code and some of the
792 print routines to allow for greater than 60 characters or, when
793 printing as hex strings, 20 characters. [ISC-Bugs #22743]
795 - In Solaris 11 switch to using sockets instead of DLPI, thanks
796 to a patch form Oracle. [ISC-Bugs #24634].
798 - Strict checks for content of domain-name DHCPv4 option can now be
799 configured during compilation time. Even though RFC2132 does not allow
800 to store more than one domain in domain-name option, such behavior is
801 now enabled by default, but this may change some time in the future.
802 See ACCEPT_LIST_IN_DOMAIN_NAME define in includes/site.h.
805 - DNS Update fix. A misconfigured server could crash during DNS update
806 processing if the configuration included overlapping pools or
807 multiple fixed-address entries for a single address. This issue
808 affected both IPv4 and IPv6. The fix allows a server to detect such
809 conditions, provides the user with extra information and recommended
810 steps to fix the problem. If the user enables the appropriate option
811 in site.h then server will be terminated
814 ! Two packets were found that cause a server to halt. The code
815 has been updated to properly process or reject the packets as
816 appropriate. Thanks to David Zych at University of Illinois
817 for reporting this issue. [ISC-Bugs #24960]
818 One CVE number for each class of packet.
822 - Fix the code that checks for an existing DDNS transaction to cancel
823 when removing DDNS information, so that we will continue with the
824 processing if we have a lease even if it doesn't have an outstanding
825 transaction. [ISC-Bugs #24682]
827 - Add AM_MAINTAINER_MODE to configure.ac to avoid rebuilding
828 configuration files. [ISC-Bugs #24107]
830 - Add support for passing DDNS information to a DNS server over
831 an IPv6 address. [ISC-Bugs #22647]
833 - Enhanced patch for 23595 to handle IPv4 fixed addresses more
834 cleanly. [ISC-Bugs #23595]
836 ! Add a check for a null pointer before calling the regexec function.
837 Without this check we could, under some circumstances, pass
838 a null pointer to the regexec function causing it to segfault.
839 Thanks to a report from BlueCat Networks.
843 ! Modify the DDNS handling code. In a previous patch we added logging
844 code to the DDNS handling. This code included a bug that caused it
845 to attempt to dereference a NULL pointer and eventually segfault.
846 While reviewing the code as we addressed this problem, we determined
847 that some of the updates to the lease structures would not work as
848 planned since the structures being updated were in the process of
849 being freed: these updates were removed. In addition we removed an
850 incorrect call to the DDNS removal function that could cause a failure
851 during the removal of DDNS information from the DNS server.
852 Thanks to Jasper Jongmans for reporting this issue.
856 - Fixed the code that checks if an address the server is planning
857 to hand out is in a reserved range. This would appear as
858 the server being out of addresses in pools with particular ranges.
861 - In the DDNS code handle error conditions more gracefully and add more
862 logging code. The major change is to handle unexpected cancel events
863 from the DNS client code.
866 - Tidy up the receive calls and eliminate the need for found_pkt.
869 - Add support for Infiniband over sockets to the server and
870 relay code. We've tested this on Solaris and hope to expand
871 support for Infiniband in the future. This patch also corrects
872 some issues we found in the socket code.
875 - Add a compile time check for the presence of the noreturn attribute
876 and use it for log_fatal if it's available. This will help code
877 checking programs to eliminate false positives.
880 - Fixed many compilation problems ("set, but not used" warnings) for
881 gcc 4.6 that may affect Ubuntu 11.10 users. [ISC-Bugs #27588]
883 - Modify the code that determines if an outstanding DDNS request
884 should be cancelled. This patch results in cancelling the
885 outstanding request less often. It fixes the problem caused
886 by a client doing a release where the TXT and PTR records
887 weren't removed from the DNS.
890 - Use offsetof() instead of sizeof() to get the sizes for dhcpv6_relay_packet
891 and dhcpv6_packet in several more places. Thanks to a report from
892 Bruno Verstuyft and Vincent Demaertelaere of Excentis.
895 - Remove outdated note in the description of the bootp keyword about the
896 option not satisfying the requirement of failover peers for denying
897 dynamic bootp clients.
900 - Multiple items to clean up IPv6 address processing.
901 When processing an IA that we've seen check to see if the
902 addresses are usable (not in use by somebody else) before
904 When reading in leases from the file discard expired addresses.
905 When picking an address for a client include the IA ID in
906 addition to the client ID to generally pick different addresses
908 [ISC-Bugs #23138] [ISC-Bugs #27945] [ISC-Bugs #25586]
911 - Remove unnecessary checks in the lease query code and clean up
912 several compiler issues (some dereferences of NULL and treating
913 an int as a boolean).
916 - Fix the NA and PD allocation code to handle the case where a client
917 provides a preference and the server doesn't have any addresses or
918 prefixes available. Previously the server ignored the request with
919 this patch it replies with a NoAddrsAvail or NoPrefixAvail response.
920 By default the code performs according to the errata of August 2010
921 for RFC 3315 section 17.2.2; to enable the previous style see the
922 section on RFC3315_PRE_ERRATA_2010_08 in includes/site.h. This option
923 may be removed in the future.
924 Thanks to Jiri Popelka at Red Hat for the patch.
927 - Fix up some issues found by static analysis.
928 A potential memory leak and NULL dereference in omapi.
929 The use of a boolean test instead of a bitwise test in dst.
932 - Rotate the lease file when running in v6 mode.
933 Thanks to Christoph Moench-Tegeder at Astaro for the
934 report and the first version of the patch.
937 - Correct code to calculate timing values in client to compare
938 rebind value to infinity instead of renew value.
939 Thanks to Chenda Huang from H3C Technologies Co., Limited
940 for reporting this issue.
943 - Fix some issues in the code for parsing and printing options.
944 [ISC-Bugs #22625] - properly print options that have several fields
945 followed by an array of something for example "fIa"
946 [ISC-Bugs #27289] - properly parse options in declarations that have
947 several fields followed by an array of something for example "fIa"
948 [ISC-Bugs #27296] - properly determine if we parsed a 16 or 32 bit
949 value in evaluate_numeric_expression (extract-int).
950 [ISC-Bugs #27314] - properly parse a zero length option from
951 a lease file. Thanks to Marius Tomaschewski from SUSE for the report
952 and prototype patch for this ticket as well as ticket 27289.
954 ! Previously the server code was relaxed to allow packets with zero
955 length client ids to be processed. Under some situations use of
956 zero length client ids can cause the server to go into an infinite
957 loop. As such ids are not valid according to RFC 2132 section 9.14
958 the server no longer accepts them. Client ids with a length of 1
959 are also invalid but the server still accepts them in order to
960 minimize disruption. The restriction will likely be tightened in
961 the future to disallow ids with a length of 1.
962 Thanks to Markus Hietava of Codenomicon CROSS project for the
963 finding this issue and CERT-FI for vulnerability coordination.
967 ! When attempting to convert a DUID from a client id option
968 into a hardware address handle unexpected client ids properly.
969 Thanks to Markus Hietava of Codenomicon CROSS project for the
970 finding this issue and CERT-FI for vulnerability coordination.
974 ! A pair of memory leaks were found and fixed. Thanks to
975 Glen Eustace of Massey University, New Zealand for finding
980 - Existing legacy unit-tests have been migrated to Automated Test
981 Framework (ATF). Several new tests have been developed. To enable
982 unit-tests, please use --with-atf in configure script. A Developer's
983 Guide has been added. To generate it, please use make devel in
984 the doc directory. It is currently in early stages of development,
985 but is expected to grow in the near future. [ISC-Bugs 25901]
987 ! An issue with the use of lease times was found and fixed. Making
988 certain changes to the end time of an IPv6 lease could cause the
989 server to abort. Thanks to Glen Eustace of Massey University,
990 New Zealand for finding this issue.
994 - Update the memory leakage debug code to work with v6.
997 - Relax the requirements for deleting an A or AAAA record.
998 Previously the DDNS removal code required both the A or AAAA
999 record and the TXT record to exist. This requirement could
1000 cause problems if something interrupted the removal leaving
1001 the TXT record alone. This relaxation was codified in RFC 4703.
1004 - Modify the failover code to handle incorrect peer names
1005 better. Previously the structure holding the name might
1006 have been freed inappropriately in some cases and not
1007 freed in other cases.
1010 - Add a configure option, enable-secs-byteorder, to deal with
1011 clients that do the byte ordering on the secs field incorrectly.
1012 This field should be in network byte order but some clients
1013 get it wrong. When this option is enabled the server will examine
1014 the secs field and if it looks wrong (high byte non zero and low
1015 byte zero) swap the bytes. The default is disabled. This option
1016 is only useful when doing load balancing within failover.
1019 - Fix a set of issues that were discovered via a code inspection
1020 tool. Thanks to Jiri Popelka and Tomas Hozza Red Hat for the logs
1024 - Parsing unquoted base64 strings improved. Parser now properly handles
1025 strings that contain reserved names. [ISC-Bugs #23048]
1027 - Modify the nak_lease function to make some attempts to find a
1028 server-identifier option to use for the NAK.
1031 - The client now passes information about the options it requested
1032 from the server to the script code via environment variables.
1033 These variables are of the form requested_<option_name>=1 with
1034 the option name being the same as used in the new_* and old_*
1038 - Add support for a simple check that the server id in a request message
1039 to a failover peer matches the server id of the server. This support
1040 is enabled by editing the file includes/site.h and uncommenting the
1041 definition for SERVER_ID_CHECK. The option has several restrictions
1042 and issues - please read the comment in the site.h file before
1046 - Tidy up some compiler issues in the debug code.
1049 - Move the dhcpd.conf exmample file to dhcpd.conf.example to avoid
1050 overwriting the dhcpd.conf file when installing a new version of
1051 ISC DHCP. The user will now need to manual copy and edit the
1052 dhcpd.conf file as desired.
1055 - Check the status value when trying to read from a connection to
1056 see if it may have been closed. If it appears closed don't try
1057 to read from it again. This avoids a potential busy-wait like
1058 loop when the peer names are mismatched.
1061 - Remove an unused variable to keep compilers happy.
1064 - Modify test makefiles to be more similar to standard makefiles
1065 and comment out a currently unused test.
1068 - Address static analysis warnings.
1069 [ISC-Bugs #33510] [ISC-Bugs #33511]
1071 - Silence benign static analysis warnings.
1074 - Add check for 64-bit package for atf.
1077 - Use newer auto* tool packages and turn on RFC_3542 support on Mac OS.
1080 - Remove a variable when it isn't being used due to #ifdefs to avoid
1081 a compiler warning on Solaris using GCC.
1084 - Add a check for too much whitespace in a config or lease file.
1085 Thanks to Paolo Pellegrino for finding the issue and a suggestion
1089 - Fix several problems with using OMAPI to manipulate class and subclass
1093 - Added a sleep call after killing the old client to allow time
1094 for the sockets to be cleaned. This should allow the -r option
1095 to work more consistently.
1098 - Missing files for ISC DHCP Developer's Guide are now included in
1099 the release tarballs. To generate this documentation, please use
1100 make devel command in doc directory. [ISC-Bugs #32767]
1102 - Update client script for use with openwrt.
1105 - Fix the socket handling for DHCPv6 clients to allow multiple instances
1106 of a client on a single machine to work properly. Previously only
1107 one client would receive the packets. Thanks to Jiri Popelka at Red Hat
1108 for the bug report and a potential patch.
1111 - Added support for gentle shutdown after signal is received.
1112 [ISC-Bugs #32692] [ISC-Bugs 34945]
1114 - Enhance the DHCPv6 server logging to include the addresses that are assigned
1118 - Fix an operation in the DDNS code to be a bitwise instead of logical or.
1122 Changes since 4.1.0 (new features)
1124 - Failover port configuration can now be left to defaults (port 647) as
1125 described in the -12 revision of the Failover draft (and assigned by
1126 IANA). Thanks in part to a patch from David Cantrell at Red Hat.
1128 - If configured, dhclient may now transmit to an anycast MAC address,
1129 rather than using a broadcast address. Thanks to a patch from David
1130 Cantrell at Red Hat.
1132 - Added client support for setting interface MTU and metric, thanks to
1133 Roy "UberLord" Marples <roy@marples.name>.
1135 - Added client -D option to specify DUID type to send.
1137 - A new failover configuration parameter has been introduced for those
1138 environments where DHCP servers can be reasonably guaranteed to be
1139 "down" when the failover TCP socket is severed, "auto-partner-down".
1140 This parameter is not generally safe, and by default is disabled, so
1141 please carefully review the documentation of this parameter in the
1142 dhcpd.conf(5) manpage before determining to use it yourself.
1144 - Added a configuration function, 'gethostname()', which calls the system
1145 function of the same name and presents the results as a data expression.
1146 This function can be used to incorporate the system level hostname of
1147 the system the DHCP software is operating on in responses or queries (such
1148 as including a failover partner's hostname in a dhcp message or binding
1149 scope, or having a DHCP client send any system hostname in the host-name or
1150 FQDN options by default).
1152 - The dhcp-renewal-time and dhcp-rebinding-time options may now be configured
1153 for DHCPv4 operation and used independently of the dhcp-lease-time
1154 calculations. Invalid renew and rebinding times (e.g., greater than the
1155 determined lease time) are omitted.
1157 - Processing the DHCP to DNS server transactions in an asyncrhonous fashion.
1158 The DHCP server or client can now continue with its processing while
1159 awaiting replies from the DNS server.
1161 - The 'hardware [ethernet|etc] ...;' parameter in host records has been
1162 extended to attempt to match DHCPv6 clients by the last octets of a
1163 DUID-LL or DUID-LLT provided by the client.
1165 Changes since 4.1.0 (bug fixes)
1167 - Remove infinite loop in token_print_indent_concat().
1169 - Validate the argument to the -p option.
1171 - The notorious 'option <unknown> ... larger than buffer' log line,
1172 which is seen in some malformed DHCP client packets, was modified.
1173 It now logs the universe name, and does not log the length values
1174 (which are bogus corruption read from the packet anyway). It also
1175 carries a hopefully more useful explanation.
1177 - Suppress spurious warnings from configure about --datarootdir
1179 - A bug was fixed that caused the server not to answer some valid Solicit
1180 and Request packets, if the dynamic range covering any requested addresses
1181 had been deleted from configuration.
1183 - Update the code to deal with GCC 4.3. This included two sets of changes.
1184 The first is to the configuration files to include the use of
1185 AC_USE_SYSTEM_EXTENSIONS. The second is to deal with return values that
1188 - The db-time-format option was documented in manpages.
1190 - Using reserved leases no longer results in 'lease with binding state
1191 free not on its queue' error messages, thanks to a patch from Frode
1194 - Fix a build error in dhcrelay, using older versions of gcc with
1197 - Two uninitialized stack structures are now memset to zero, thanks to a
1198 patch from David Cantrell at Red Hat.
1200 - Fixed a cosmetic bug where pretty-printing valid domain-search options would
1201 result in an erroneous error log message ('garbage in format string').
1203 - A bug in DLPI packet transmission (Solaris, HP/UX) that caused the server
1204 to stop receiving packets is fixed. The same fix also means that the MAC
1205 address will no longer appear 'bogus' on DLPI-based systems.
1207 - A bug in select handling was discovered where the results of one select()
1208 call were discarded, causing the server to process the next select() call
1209 and use more system calls than required. This has been repaired - the
1210 sockets will be handled after the first return from select(), resulting in
1213 - The update-conflict-detection feature would leave an FQDN updated without
1214 a DHCID (still currently implemented as a TXT RR). This would cause later
1215 expiration or release events to fail to remove the domain name. The feature
1216 now also inserts the client's up to date DHCID record, so records may safely
1217 be removed at expiration or release time. Thanks to a patch submitted by
1220 - Memory leak in the load_balance_mine() function is fixed. This would
1221 leak ~20-30 octets per DHCPDISCOVER packet while failover was in use
1222 and in normal state.
1224 - Various compilation fixes have been included for the memory related
1225 DEBUG #defines in includes/site.h.
1227 - Fixed Linux client script 'unary operator expected' errors with DHCPv6.
1229 - Fixed setting hostname in Linux hosts that require hostname argument
1230 to be double-quoted. Also allow server-provided hostname to
1231 override hostnames 'localhost' and '(none)'.
1233 - Fixed failover reconnection retry code to continue to retry to reconnect
1234 rather than restarting the listener.
1236 - Compilation on Solaris with USE_SOCKETS defined in includes/site.h has
1237 been repaired. Other USE_ overrides should work better.
1239 - A check for the local flavor of IFNAMSIZ had a broken 'else' condition,
1240 that probably still resulted in the correct behaviour (but wouldn't use
1241 a larger defined value provided by the host OS).
1243 - Fixed a bug where an OMAPI socket disconnection message would not result
1244 in scheduling a failover reconnection, if the link had not negotiated a
1245 failover connect yet (e.g.: connection refused, asynch socket connect()
1248 - A bug was fixed that caused the 'conflict-done' state to fail to be parsed
1249 in failover state records.
1251 ! A stack overflow vulnerability was fixed in dhclient that could allow
1252 remote attackers to execute arbitrary commands as root on the system,
1253 or simply terminate the client, by providing an over-long subnet-mask
1254 option. CERT VU#410676 - CVE-2009-0692
1256 - Fixed a bug where relay agent options would never be returned when
1257 processing a DHCPINFORM.
1259 - Versions 3.0.x syntax with multiple name->code option definitions is now
1260 supported. Note that, similarly to 3.0.x, for by-code lookups only the
1261 last option definition is used.
1263 - Fixed a bug where a time difference of greater than 60 seconds between a
1264 failover pair could cause the primary to crash on contact with the
1265 secondary. Thanks to a patch from Steinar Haug.
1267 - Don't look for IPv6 interfaces on Linux when running in DHCPv4 mode.
1268 Thanks to patches from Matthew Newton and David Cantrell.
1270 - Secondary servers in a failover pair will now perform ddns removals if
1271 they had performed ddns updates on a lease that is expiring, or was
1272 released through the primary. As part of the same fix, stale binding scopes
1273 will now be removed if a change in identity of a lease's active client is
1274 detected, rather than simply if a lease is noticed to have expired (which it
1275 may have expired without a failover server noticing in some situations).
1277 - A patch supplied by David Cantrell at RedHat was applied that detects
1278 invalid calling parameters given to the ns_name_ntop() function.
1279 Specifically, it detects if the caller passed a pointer and size pair
1280 that causes the pointer to integer-wrap past zero.
1282 ! Fixed a fenceposting bug when a client had two host records configured,
1283 one using 'uid' and the other using 'hardware ethernet'. CVE-2009-1892
1285 - Fixed the check in the dhcp_interface_signal_handler routine to verify
1286 the existence of the linked signal handler before calling it.
1288 - Both host and subnet6 configuration groups are now included whether a
1289 fixed-address6 (DHCPv6) is in use or not. Host scoped configuration takes
1290 precedence. This fixes two bugs, one where host scoped configuration
1291 would not be included from a non-fixed-address6 host record, and the equal
1292 and opposite bug where subnet6 scoped configuration would not be used when
1293 over-riding values were not present in a matching fixed-address6 host
1296 - ./configure now checks to ensure the intX_t and u_intX_t types are defined,
1297 correcting a compilation failure when using Sun's compiler.
1299 - Modified the handling of a connection to avoid releasing the omapi io
1300 object for the connection while it is still in use. One symptom from
1301 this error was a segfault when a failover secondary attempted to connect
1302 to the failover primary if their clocks were not synchronized.
1304 - Clean up to allow compilation with gcc 2.95.4 on FreeBSD. Remove an
1305 extra semi-colon from common/dns.c and moved setting a variable to NULL
1306 in server/dhcpv6.c to allow the compiler to decide that the variable
1307 was always properly set.
1309 Changes since 4.1.0b1
1311 - A missing "else" in dhcrelay.c could have caused an interface not to
1314 Changes since 4.1.0a2
1316 - A cosmetic bug in DHCPDECLINE processing was fixed which caused all
1317 successful DHCPDECLINEs to be logged as "not found" rather than
1320 - Added configuration file examples for DHCPv6.
1322 - Some failover debugging #defines have been better defined and some
1323 high frequency messages moved to a deeper debugging symbol.
1325 - The CLTT parameter in failover is now only updated by client activity,
1326 and not by failover binding updates (taking on the peer's CLTT).
1328 - Failover BNDUPD messages are now discarded if they conflict with an
1329 update that has been transmitted, but not acknowledged.
1331 - A bug cleaning up unknown-xxx temporary option definitions was fixed.
1333 - Delayed-ack is now a compile-time option, compiled out by default.
1334 This feature is simply too experimental for right now, and causes
1335 some problems to some failover installations. We will revisit this
1338 - The !inet_pton() call in res_mkupdrec was adjusted to '<= 0' as
1339 inet_pton returns either 1, 0, or -1.
1341 - A dhclient-script for MacOS X has been included, which enables
1342 'dhclient -6' support.
1344 - DDNS removal routines were updated so that the DHCID is not removed until
1345 the client has been deprived of all A and AAAA records (not only the last
1346 one of either of those). This resolves a bug where dual stack clients
1347 would not be able to regain their names after either expiration event.
1349 Changes since 4.1.0a1
1351 - Corrected list of failover state values in dhcpd man page.
1353 - Fixed a bug that caused some request types to be logged incorrectly.
1355 - Clients that sent a parameter request list containing the
1356 routers option before the subnet mask option were receiving
1357 only the latter. Fixed.
1359 - The server wasn't always sending the FQDN option when it should.
1361 - A partner-down failover server no longer emits 'peer holds all free leases'
1362 if it is able to newly-allocate one of the peer's leases.
1364 - Fixed a coredump when adding a class via OMAPI.
1366 - Check whether files are zero length before trying to parse them.
1368 - Ari Edelkind's PARANOIA patch has been included and may be compiled in
1369 via two ./configure parameters, --enable-paranoia and
1370 --enable-early-chroot.
1372 - ./configure was extended to cover many optional build features, such
1373 as failover, server tracing, debugging, and the execute() command.
1375 - There is now a default 1/4 of a second scheduled delay between delayed
1376 fsync()'s, it can be configured by the max-ack-delay configuration
1379 - A bug was fixed where the length of a hostname was miscalculated, so that
1380 hosts were given odd-looking domain names ("foo.bar.ba.example.com").
1382 - Shared network selection should be done from the innermost relay
1383 valid link-address field, rather than the outermost.
1385 - Prefix pools are attached to shared network scopes.
1387 - Merged IA_XX related structures.
1389 - Add DHCPv6 files in configure.
1391 - A memory leak when using omapi has been fixed.
1393 - DHCPv6 vendor-class options (VSIO) are now only sent when they appear
1394 on the DHCPv6 ORO. This resolves a bug where VSIO options were placed
1395 in IA_NA encapsulated options fields.
1397 - Integrated client with stateless, temporary address and prefix delegation
1400 - A double-dereference in dhclient transmission of DHCPDECLINEs was
1403 - Fix handling of format code 'Z'.
1405 - Support "-1" argument in DHCPv6.
1407 - Merge DHCPv6-only "dhcrelay6" into general-purpose "dhcrelay" (use
1408 "-6" option to select DHCPv6 mode).
1410 - Fix handling of -A and -a flags in dhcrelay; it was failing to expand
1411 packet size as needed to add relay agent options.
1413 - A bug in subnet6 parsing where options contained in subnet6 clauses would
1414 not be applied to clients addressed within that network was repaired.
1416 - When configuring a "subnet {}" or "subnet6 {}" without an explicit
1417 shared-network enclosing it, the DHCP software would synthesize a
1418 shared-network to contain the subnet. However, all configuration
1419 parameters within the subnet more intuitively belong "to any client
1420 on that interface", or rather the synthesized shared-network. So,
1421 when a shared-network is synthesized, it is used to contain the
1422 configuration present inside the subnet {} clause. This means that
1423 the configuration will be valid for all clients on that network, not
1424 just those addressed out of the stated subnet. If you intended the
1425 opposite, the workaround is to explicitly configure an empty
1428 - A bug was fixed where Information-Request processing was not sourcing
1429 configured option values.
1431 - A warning was added since the DHCPv6 processing software does not yet
1432 support class statements.
1434 - Compliation warnings on GCC 4.3 relating to bootp source address
1435 selection were repaired.
1437 - The v6 BSD socket method was updated to use a single UDP BSD socket
1438 no matter how many interfaces are involved, differentiating the
1439 interfaces the packets were received on by the interface index supplied
1442 - The relay agent no longer listens to the All DHCP Servers Multicast
1445 - A bug was fixed in data_string_sprintfa() where va_start was only called
1446 once for two invocations of vsprintf() variants.
1448 - ERO (RFC 4994) server support.
1450 - Basic and partial DHCPv6 leasequery support.
1452 - Reliable DHCPv6 release (previous behavior, send release and exit, is
1453 still available with dhclient -6 -1 -r).
1455 Changes since 4.0.0 (new features)
1457 - Added DHCPv6 rapid commit support.
1459 - Added explicit parser support for zero-length DHCP options, such as
1460 rapid-commit, via format code 'Z'.
1462 - It's now possible to update the "ends" field of a lease with OMAPI.
1463 This is useful if you want not only to release a lease, but also make
1464 it available for reuse right away. Hat tip to Christof Chen.
1466 - Fixed definition of the iaaddr hash functions to use the correct
1467 functions when referencing and dereferencing memory.
1469 - Some definitions not in phase with the IANA registry were updated.
1471 - Allocated interface IDs are better controlled ('u' bit set to zero,
1472 reserved IDs avoided).
1474 - Unicast options are taken into account only for RENEWs.
1476 - NoAddrsAvail answers to SOLICITs are always ADVERTISEs even when a SOLICIT
1477 carries a rapid-commit option.
1479 - Return in place of raise an impossible condition when one tries to release
1480 an empty active lease.
1482 - Timer granularity is now 1/100s in the DHCPv6 client.
1484 - The dhclient-script was updated to create a host route for the default
1485 gateway if the supplied subnet mask for an IPv4 address was a /32. This
1486 allows the client to work in 'captive' network environments, where the
1487 operator does not want clients to crosstalk directly.
1489 - MINUS tokens should be parseable again.
1491 - Multiple (up to "delayed-ack x;" maximum) DHCPv4 packets are now queued and
1492 released in bursts after single fsync() events when the upper limit is
1493 reached or if the receiving sockets go dry. The practical upshot is
1494 that fsync-coupled server performance is now multiplicitively increased.
1495 The default delayed ack limit is 28. Thanks entirely to a patch from
1498 Changes since 4.0.0 (bug fixes)
1500 - DHCP now builds on AIX.
1502 - Exit with warning when DHCPv6-specific statements are used in the
1503 config file but -6 is not specified.
1505 - Fixed "--version" flag in dhcrelay
1507 - The 'min-secs' configuration parameter's log message has been updated to
1510 - The warning logged when an address range doesn't fit in the subnets
1511 they were declared has been updated to be more helpful and identify the
1512 typo in configuration that created the spanning addresses.
1514 - A bug in failover pool rebalancing that caused POOLREQ message ping-pongs
1517 - A flaw in failover pool rebalancing that could cause POOLREQ messages to
1518 be sent outside of the min-balance/max-balance scheduled intervals has
1521 - A cosmetic bug during potential-conflict recovery that caused the peer's
1522 'conflict-done' state message to be logged as 'unknown-state' has been
1523 repaired. It is now logged correctly.
1525 - A bug was fixed where the 'giaddr' may be used to find the client's subnet
1526 rather than its own 'ciaddr'.
1528 - A log message was introduced to clarify the situation where a failover
1529 'address' parameter (the server's local address) did not resolve to an
1532 - The minimum site code value was set to 224 in 3.1.0 to track RFC3942. This
1533 broke a lot of legacy site local configurations. The new code in place will
1534 track site local space minimum option codes and logs a warning to encourage
1535 updates and exploration of site local code migration problems. Option
1536 codes less than 128 in site local spaces remain inaccessible.
1538 - A possible relay agent option bug was repaired where random server
1539 initialization state may have been used to signal the relay agent
1540 information options sub-option code for the 'END' of the option space.
1542 - Fixes to allow code to compile and run on Solaris 9.
1544 - Fixes to allow code to compile on Mac OS X Leopard (10.5).
1546 - When server is configured with options that it overrides, a warning is
1547 issued when the configuration file is read, rather than at the time the
1548 option is overridden. This was important, because the warning was given
1549 every time the option was overridden, which could create a lot of
1550 unnecessary logging.
1552 - Fixed a compilation problems on platforms that define a value for FDDI,
1553 which conflicts with a dhcp configuration syntax token by the same name.
1555 - When a failover server suspects it has encountered a peer running a
1556 version 3.0.x failover server, a warning that the failover wire protocol
1557 is incompatible is printed.
1559 - The failover server no longer issues a floating point error if it encounters
1560 a previously undefined option code.
1562 - Fix startup error messages to report a missing "subnet6 declaration", rather
1563 than a missing "subnet declaration", when running as a DHCPv6 server.
1565 - DHCPv6 client timestamp in DUID was based on the year 1970 rather
1568 - Warn when attempting to use a hardware parameter in DHCPv6.
1570 - DHCPv6 released resources are now marked as released by the client.
1572 - 'Soft' bindings have no more side-effects.
1574 Changes since 4.0.0b3
1576 - The reverse dns name for PTR updates on IPv6 addresses has been fixed to
1577 use ip6.arpa. rather than default to in-addr.arpa and require user
1580 - dhc6_lease_destroy() and dhc6_ia_destroy() now set lease and IA pointers
1581 to NULL after freeing, to prevent subsequent accesses to freed memory.
1583 - The DHCPv6 server would not send the preference option unless the
1584 client requested it, via the ORO. This has been fixed, so the DHCPv6
1585 server will always send the preference value if it is configured.
1587 - When addresses were passed as hints to the server in an IA, they were
1588 incorrectly handled, sometimes being treated as an error. Now the
1589 server will treat these as hints and ignore them if it cannot supply
1590 a requested address.
1592 - If the client had multiple addresses, and one expired (was not renewed
1593 by the server), the client would continue to attempt to renew the same
1594 old address over and over. Now, the client will omit any expired
1595 addresses from future Confirm, Renew, or Rebind messages.
1597 - dhclient -6 will now select renew/rebind timers based upon the longest
1598 address expiration time rather than the shortest expiration time, in
1599 order to avoid cascading renewals in the event a server elects not to
1600 extend one of multiple IAADDR leases.
1602 - The server now limits clients that request multiple addresses to one
1603 address per IA by default, which can be adjusted through the
1604 "limit-addrs-per-ia" configuration option.
1606 - The DHCPv6 client now issues fresh transaction IDs on Renew and Rebind
1607 message exchanges, rather than using the most recent ID.
1609 - The DHCPv6 server now replies to Information-Request messages.
1611 - A bug was fixed in the dhclient-script for BSDs to correctly carry error
1612 codes through some conditions.
1614 - The parsing of some options in the dhclient lease file, in particular
1615 the success DHCPv6 status-code, was fixed.
1617 - A bug was fixed that caused the DHCPv6 ORO option to be corrupted with
1618 seemingly random values.
1620 - A reference overleak in DHCPv6 shared network processing was repaired.
1622 - ./configure now autodetects local database locations rather than trying
1623 to put dhcpd.leases and dhclient.leases in /usr/local/var/db, which no
1626 - Regression fix for bug where server advertised a IPv6 address in
1627 response to a SOLICIT but would not return the address in response
1630 - A bug was fixed where the DHCPv6 server puts the NoAddrsAvail status
1631 code in the IA_NA was fixed. The status code now appears in the root
1634 Changes since 4.0.0b2
1636 - Clarified error message when lease limit exceeded
1638 - Relative time may now be used as a qualifier for 'allow' and 'deny' access
1639 control lists. These directives may be used to assist in re-addressing
1640 address pools without having to constantly reconfigure the server. Please
1641 see 'man dhcpd.conf' for more information on allow/deny 'after time' syntax.
1642 Thanks to a patch from Christof Chen.
1644 - The server will now include multiple IA_NA's and multiple IAADDRs within
1645 them, if advertised by the client. It still only seeks to allocate one
1648 Changes since 4.0.0b1
1650 - Use different paths for PID and lease files when running in DHCPv4
1651 or DHCPv6 mode, so that servers for both protcols can be run
1652 simultaneously on a single interface.
1654 - Fixed a buffer overflow error which could have allowed a denial
1655 of service under unusual server configurations
1657 - Eliminated a spurious error message from the client
1659 - A number of bugs with the internal handling of lease state on the
1660 server have been fixed. Some of these could cause server crashes.
1662 - The peer_wants_leases() changes pulled up from 3.1.0 were corrected,
1663 'never used' leases will no longer consistently shift between servers
1664 on every pool rebalance run.
1666 - sendmsg()/recvmsg() control buffers are now declared in such a way to
1667 ensure they are correctly aligned on all (esp. 64-bit) architectures.
1669 - The client leasing subsystem was streamlined and corrected to account
1670 more closely for changes in client link attachment selection.
1672 Changes since 4.0.0a3
1674 - The DHCP server no longer requires a "ddns-update-style" statement,
1675 and now defaults to "none", which means DNS updates are disabled.
1677 - Log messages when failover peer names mismatch have been improved to
1678 point out the problem.
1680 - Bug where server advertised a IPv6 address in response to a SOLICIT
1681 but would not return the address in response to a REQUEST. Thanks to
1682 Dennis Kou for finding the bug.
1684 - Fixed an error causing the server to lock up on lease expiration,
1685 reported independently by Jothilingam Vasu and Dennis Kou.
1687 - Fixed a ./configure bug where compile tests were failing due to
1688 "-Werror" (unused variable) rather than the actual test failure. Lead
1689 to inconsistent and unworkable auto-configurations.
1691 - Compilation with DLPI and -Werror has been repaired.
1693 - Error in decoding IA_NA option if multiple interfaces are present
1694 fixed by Marcus Goller.
1696 - DHCPv6 server Confirm message processing has been enhanced - it no
1697 longer replies only to clients with host {} records, it now replies
1698 as directed in RFC3315 section 18.2.2 - that is, to all clients
1699 regardless of the existence of bindings.
1701 - A core dump during expired lease cleanup has been repaired.
1703 - DDNS updates state information are now stored in 'binding scopes' that
1704 follow the leases through their lifecycles. This enables DDNS teardowns
1705 on leases that are assigned and expired inbetween a server restart (the
1706 state is recovered from dhcpd.leases). Arbitrary user-specified binding
1707 scopes ('set var = "value";') are not yet supported.
1709 - Additional compilation problems on HP/UX have been repaired.
1711 Changes since 4.0.0a2
1713 - Fix for startup where there are no IPv4 addresses on an interface.
1714 Thanks to Marcus Goller for reporting the bug.
1716 - Fixed file descriptor leak on listen failure. Thanks to Tom Clark.
1718 - Bug in server configuration parser caused server to get stuck on
1719 startup for certain bad pool declarations. Thanks to Guillaume
1720 Knispel for the bug report and fix.
1722 - Code cleaned to remove warnings reported by "gcc -Wall".
1724 - DHCPv6 is now the default. You can disable DHCPv6 support using the
1725 "--disable-dhcpv6" flag when you run the configure script.
1727 - An internal database inconsistency bug was repaired where the server
1728 would segfault if a client attempted to renew a lease that had been
1729 loaded from persistent storage.
1731 - 'request' and 'also request' syntaxes have been added to accommodate
1732 the DHCPv6 client configuration. 'send dhcp6.oro' is no longer
1735 - Bug fixed where configuration file parsing did not work with
1736 zero-length options; this made it impossible to set the
1737 rapid-commit option.
1739 - Bogus messages about host records with IPv4 fixed-addresses being of
1740 non-128-bits in length were removed.
1742 Changes since 4.0.0a1
1744 - Bug in octal parsing fixed. Thanks to Bernd Fuhrmann for the report
1747 - Autoconf now supplies proper flags for Solaris DHCPv6 builds.
1749 - Fix for parsing error on some IPv6 addresses.
1751 - Invalid CIDR representation for IPv6 subnets or ranges now checked
1752 for when loading configuration.
1754 - Compilation on HP/UX has been repaired. The changes should generally
1755 apply to any architecture that supplies SIOCGLIFCONF but does not
1756 use 'struct lifconf' structures to pass values.
1758 - Two new operators, ~= and ~~, have been integrated to implement
1759 boolean matches by regular expression (such as may be used in
1760 class matching statements). Thanks to a patch by Alexandr S.
1761 Agranovsky, which underwent slight modification.
1763 - Fix for icmp packets on 64-bit systems (bug introduced in 4.0).
1765 - A bug was fixed in interface discovery wherein an error identifying
1766 a server-configured interface with no IPv4 addresses would SEGV.
1768 - Fixed a bug in which write_lease() might report a failure incorrectly
1770 - Added support for DHCPv6 Release messages
1772 - Added -x option to dhclient, which triggers dhclient processes
1773 to exit gracefully without releasing leases first
1775 - All binaries (client, server, relay) now change directories
1776 to / before going into daemon mode, so as not to hold $CWD open
1778 - Fixed a bug parsing DHCPv6 client-id's in host-identifier statements
1780 - Fixed a bug with the 'ddns-updates' boolean server configuration
1781 parameter, which caused the server to fail.
1783 Changes since 4.0.0-20070413
1785 - Old (expired) leases are now cleaned.
1787 - IPv6 subnets now have support for arbitrary allocation ranges via
1788 a new 'range6' configuration directive.
1790 - An obviated option code hash lookup to find D6O_CLIENTID was removed.
1792 - Corrected some situations where variables might be used without being
1795 - Silenced several other compiler warnings.
1797 - Include the more standard sys/uio.h rather than rely upon other
1798 header files to include it (fixes a BSD 4.2 compile failure).
1800 - Duplicate dhclient-script updates for DHCPv6 to all provided scripts.
1802 - DHCPv4 I/O methods that failed to sense hardware address were corrected.
1804 - DHCPv4 is now the default (as documented) rather than DHCPv6. The default
1805 was set to DHCPv6 to facilitate ease early development, and forgotten.
1807 - Corrected a segmentation violation in DHCPv4 socket processing.
1809 - dhclient will now fork() into the background once it binds to an
1810 IPv6 address, or immediately if the -n flag is supplied.
1812 - -q is now the default behaviour on dhclient, with -d or -v enabling
1813 non-quiet (stderr logging) mode.
1815 - Fix documentation of the domain-search atom (quoted, with commas).
1817 - Document DHCPv6 options presently in the default table.
1819 - Replaced ./configure shellscripting with GNU Autoconf.
1821 Changes since 3.1.0 (NEW FEATURES)
1823 - DHCPv6 Client and Server protocol support. Use '-6' to run the daemons
1824 as v6-only. Use '-4' to run the daemons as v4-only (default. There is
1825 no support currently for both.
1827 - Server support for multiple IA_NA options, containing at most one
1830 - Client support for one IA_NA option, containing any number of IAADDR
1833 - Server support for the DHCPv6 Information-request message.
1835 - Inappropriate unicast DHCPv6 messages sent to the server are now
1836 discarded, and this has rearchitected the IO system slightly.
1838 - The DHCPv6 server DUID defaults to type 1, is persistently stored in
1839 the leases database, and can be over-ridden (either completely, or by
1840 specifying type 1 or type 2).
1842 - The server only uses Rapid-Commit if it has been configured with the
1843 Rapid-Commit option and the client requests it.
1845 - DDNS support. We now update AAAA records in the same place we would
1846 update A records, if we have an IPv6 address. We also generate IP6.ARPA
1847 style names for PTR records if we're dealing with an IPv6 address. Both
1848 A and AAAA updates are done using the same 'fqdn.' virtual option space
1849 (although the DHCPv4 FQDN and DHCPv6 FQDN options are formatted
1850 differently, they both use the same code here).
1852 - The Linux dhclient-script attempts to set and remove assigned addresses,
1853 and to configure /etc/resolv.conf from nameserver and domain name
1854 configurations. It can be extended to configure other parameters.
1856 - Initial DHCPv6 lease support.
1858 - The IO system now tracks all local IP addresses, so that the DHCP
1859 applications (particularly the dhcrelay) can discern between what frames
1860 were transmitted to it, and what frames are being carried through it which
1861 it should not intercept.
1863 Changes since 3.1.0 (Maintenance)
1865 - A bug was repaired where MAC Address Affinity for virgin leases always
1866 mapped to the primary. Virgin leases now have an interleaved preference
1867 between primary and secondary.
1869 - A bug was repaired where MAC Address Affinity for clients with no client
1870 identifier was sometimes mishashed to the peer. Load balancing during
1871 runtime and pool rebalancing were opposing.
1873 - An assertion in lease counting relating to reserved leases was repaired.
1875 - The subnet-mask option inclusion now conforms with RFC2132 section 3.3;
1876 it will only appear prior to the routers option if it is present on the
1877 Parameter-Request-List. The subnet-mask option will also only be
1878 included by default (if it is not on the PRL) in response to DISCOVER
1879 or REQUEST messages.
1881 - The FQDN option is only supplied if the client supplied an FQDN option or
1882 if the FQDN option was explicitly requested on the PRL.
1884 - Dynamic BOOTP leases are now load balanced in failover.
1886 Changes since 3.1.0rc1
1888 - The parse warning that 'deny dyanmic bootp;' must be configured for
1889 failover protected subnets was removed.
1891 Changes since 3.1.0b2
1893 - Failover rebalance events no longer play ping pong with round errors
1894 (moving leases between free and back to backup where there are an
1895 odd number of leases).
1897 - The 'pool' log line has been split into two messages, one before the
1898 rebalance run, and one after.
1900 - Any queued BNDACKs are transmitted before transmitting new BNDUPDs.
1901 This enforces the correct sequence of events for the remote server
1902 processing these messages.
1904 Changes since 3.1.0b1
1906 - Fixed a bug that caused OMAPI clients to freeze when opening lease
1909 - A new server config option "fqdn-reply" specifies whether the server
1910 should send out option 81 (FQDN). Defaults to "on". If set to "off",
1911 the FQDN option is not sent, even if the client requested it. This is
1912 needed because some clients misbehave otherwise. Thanks to Christof Chen
1915 - Allow trace output files (-tf option) to be overwritten, rather than
1916 crashing dhcpd if the file already exists
1918 - A bug was fixed that caused dhcpd to segfault if a pool was declared
1919 outside the scope of a subnet in dhcpd.conf.
1921 - Some uninitialized values were repaired in dhcpleasequery.c that
1922 caused the server to abort.
1924 - A new server config option, 'do-reverse-updates', has been added
1925 which causes the server to abstain from performing updates on PTR
1926 records. Thanks to a patch from Christof Chen at Allianz.
1928 - A bug was repaired in subencapsulation support, where spaces separated
1929 by empty spaces would not get included.
1931 - A bug in dhclient was repaired which caused it to send parameter request
1932 lists of 55 bytes in length no matter how long the declared PRL was.
1934 - 'dhcp.c(3953): non-null pointer' has been repaired. This fixes a flaw
1935 wherein the DHCPv4 server may ignore a configured server-identifier.
1937 - A flaw in failover startup sequences was repaired that sometimes left
1938 the primary DHCP server's pool rebalance schedules unscheduled.
1940 - Corrected a flaw that broke encapsulated spaces included due to presence
1941 on the parameter request list.
1943 Changes since 3.1.0a3
1945 - Some spelling fixes.
1947 Changes since 3.1.0a2
1949 - A bug was fixed where attempting to permit leasequeries results in a
1950 fatal internal error, "Unable to find server option 49".
1952 - A bug was fixed in dhclient rendering the textual output form of the
1953 domain-search option syntax.
1955 Changes since 3.1.0a1
1957 - A bug in the FQDN universe that added FQDN codes to the NWIP universe's
1958 hash table was repaired.
1960 - The servers now try harder to transmit pending binding updates when
1961 entering normal state.
1963 - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
1964 requeues all pending updates. This should reduce the number of spurious
1965 'xid mismatch' log messages.
1967 - An option definition referencing leak was fixed, which resulted in early
1968 termination of dhclient upon the renewal event.
1970 - Some default hash table sizes were tweaked, some upwards, some downwards.
1971 3.1.0a1's tables resulted in a reduction in default server memory use.
1972 The new selected values provide more of a zero sum (increasing the size
1973 of tables likely to be populated, decreasing the size of tables unlikely).
1975 - Lease structures appear in three separate hashes: by IP address, by UID,
1976 and by hardware address. One type of table was used for all three, and
1977 improvements to IP address hashing were applied to all three (so UID and
1978 hardware addresses were treated like 4-byte integers). There are now two
1979 types of tables, and the uid/hw hashes use functions more appropriate
1982 - The max-lease-misbalance percentage no longer causes scheduled rebalance
1983 runs to be skipped: it still governs the schedule, but every scheduled
1984 run will attempt balance.
1986 - A segfault bug in recursive encapsulation support has been corrected.
1988 Changes since 3.0 (New Features)
1990 - A workaround for certain STSN servers that send a mangled domain-name
1991 option was introduced for dhclient. The client will now accept corrupted
1992 server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
1993 or NAK). The server will continue to not accept corrupt client packets.
1995 - Support for 'reserved' (pseudo-static) and BOOTP leases via failover
1998 - Support for adding, removing, and managing class and subclass statements
2001 - The failover implementation was updated to comply with revision 12 of
2004 - 'make install' now creates the initial zero-length dhcpd.leases file if
2005 one does not already exist on the system.
2007 - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
2009 - The Load Balance Algorithm was misimplemented. The current implementation
2012 - lcase() and ucase() configuration expressions have been added which adjust
2013 their arguments from upper to lower and lower to upper cases respectively.
2014 Thanks to a patch from Albert Herranz.
2016 - The dhclient 'reject ...;' statement, which rejects leases given by named
2017 server-identifiers, now permits address ranges to be specified in CIDR
2018 notation. Thanks to a patch from David Boyce.
2020 - The subnet-mask option is now supplied by default, but at lowest
2021 priority. This helps a small minority of clients that provide parameter
2022 request lists, but do not list the subnet-mask option because they were
2023 designed to interoperate with a server that behaves in this manner.
2025 - The FQDN option is similarly supplied even if it does not appear on the
2026 parameter request list, but not to the exclusion of options that do
2027 appear at the parameter request list. Up until now it had ultimate
2028 priority over the client's parameter request list.
2030 - Varying option space code and length bit widths (8/16/32) are now
2031 supported. This is a milestone in achieving RFC 3925 "VIVSO" and
2034 - A new common (server or client) option, 'db-time-format local;', has
2035 been added which prints the local time in /var/db/dhcpd.leases rather
2036 than UTC. Thanks to a patch from Ken Lalonde.
2038 - Some patches to improve DHCP Server startup speed from Andrew Matheson
2039 have been incorporated.
2041 - Failover pairs now implement 'MAC Affinity' on leases moving from the
2042 active to free states. Leases that belonged to the failover secondary
2043 are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
2044 If lease rebalancing must move leases, it tries first to move leases
2045 that belong to the peer in need.
2047 - The server no longer sends POOLREQ messages unless the pool is severely
2048 misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
2050 - Pool rebalance events no longer happen upon successfully allocating a
2051 lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
2052 min-balance and max-balance statements for more information.
2054 - The DHCP Relay Agent Information Option / Link Selection Sub-Option
2055 is now supported. (See RFC3527 for details).
2057 - A new DDNS related server option, update-conflict-detection, has been
2058 added. If this option is enabled, dhcpd will perform normal DHCID
2059 conflict resolution (the default). If this option is disabled, it will
2060 instead trust the assigned name implicitly (removing any other bindings
2061 on that name). This option has not been made available in dhclient.
2063 - In those cases where the DHCP software manufactures an IP header (to
2064 transmit via bpf, lpf, etc), the IP TTL the software selects has been
2065 increased from 16 to 128. This is intended to match Microsoft Windows
2066 DHCP Client behaviour, to increase compatibility.
2068 - 'ignore client-updates;' now has behaviour that is different from
2069 'deny client-updates;'. The client's request is not truly ignored,
2070 rather it is encouraged. Should this value be configured, the server
2071 updates DNS as though client-updates were set to 'deny'. That is, it
2072 enters into DNS whatever it is configured to do already, provided it is
2073 configured to. Then it sends a response to the client that lets the
2074 client believe it is performing client updates (which it will), probably
2075 for a different name. In essence, this lets the client do as it will,
2076 ignoring this aspect of their request.
2078 - Support for compressed 'domain name list' style DHCP option contents, and
2079 in particular the domain search option (#119) was added.
2081 - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
2082 LEASEQUERY lets you query the DHCP server for information about a lease,
2083 using either an IP address, MAC address, or client identifier. Thanks
2084 to a patch from Justin Haddad.
2086 - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
2087 ethernet mac address) on the SCO platform specifically without any strange
2088 ifconfig hacks. Many thanks go to the Kroger Co. for donating the
2089 hardware and funding the development.
2091 - A new common configuration executable statement, execute(), has been
2092 added. This permits dhcpd or dhclient to execute a named external
2093 program with command line arguments specified from other configuration
2094 language. Thanks to a patch written by Mattias Ronnblom, gotten to us
2097 - A new dhcp server option 'adaptive-lease-time-threshold' has been added
2098 which causes the server to substantially reduce lease-times if there are
2099 few (configured percentage) remaining leases. Thanks to a patch submitted
2102 - Encapsulated option spaces within encapsulated option spaces is now
2105 Changes since 3.0.6rc1
2107 - supersede_lease() now requeues leases in their respective hardware
2108 address hash bucket. This mirrors client identifier behaviour.
2112 - Assorted fixes for broken network devices: Packet length is now
2113 determined from the IP header length field to finally calculate the
2114 UDP payload length, because some NIC drivers return more data than
2115 they actually received.
2117 - UDP packets are now stored in aligned data structures.
2119 - A logic error in omapi interface code was repaired that might result in
2120 incorrectly indicating 'up' state when any flags were set, rather than
2121 specifically the INTERFACE_REQUESTED flag. Thanks to a patch from
2122 Jochen Voss which got to us via Andrew Pollock at Debian.
2124 - A reference leak on binding scopes set by ddns updates was repaired.
2126 - A memory leak in the minires_nsendsigned() function call was repaired.
2127 Effectively, this leaked ~176 bytes per DDNS update.
2129 - In the case where an "L2" DHCP Relay Agent (one that does not set giaddr)
2130 was directly attached to the same broadcast domain as the DHCP server,
2131 the RFC3046 relay agent information option was not being returned to the
2132 relay in the server's replies. This was fixed; the dhcp server no longer
2133 requires the giaddr to reply with relay agent information. Note that
2134 this also improves compatibility with L2 devices that "intercept" DHCP
2135 packets and expect relay agent information even in unicast (renewal)
2136 replies. Thanks to a patch from Pekka Silvonen.
2138 - A bug was fixed where the BOOTP header 'sname' field had a value, the
2139 copy written to persistent storage was actually the contents of the
2142 - A bug was fixed where the nwip virtual option space was referencing
2143 the fqdn option's virtual option space's option cache.
2145 - Timestamp parsing errors that indicated missing "minutes" fields rather
2146 than the actually missing "seconds" fields have been repaired thanks to
2147 a patch from Kevin Steves.
2149 - A grammar error in the dhclient.8 manpage was repaired thanks to a patch
2152 - Several spelling typos were repaired, and some cross-references to other
2153 relevant documents were included in the manpages, thanks to a patch
2154 by Andrew Pollock which got to us via Tomas Pospisek.
2156 - Some bugs were fixed in the 'emergency relay agent options hologram'
2157 which is used to retain relay agent option contents from when the
2158 client was in INIT or REBIND states. This should solve problems where
2159 relay agent options were not echoed from the server, even when giaddr
2162 - dhclient now closes its descriptor to dhclient.leases prior to executing
2163 dhclient-script. Thanks to a patch from Tomas Pospisek.
2165 - The server's "by client-id" and "by hardware address" hash table lists
2166 are now sorted according to the preference to re-allocate that lease to
2167 returning clients. This should eliminate pool starvation problems
2168 arising when "INIT" clients were given new leases rather than presently
2171 Changes since 3.0.5rc1
2173 - A bug was repaired in fixes to the dhclient, which sought to run the
2174 dhclient-script with the 'EXPIRE' state should it receive a NAK in
2175 response to a REQUEST. The client now iterates the PREINIT state
2176 after the EXPIRE state, so that interfaces that might be configured
2177 'down' can be brought back 'up' and initialized.
2179 - DHCPINFORM handling for clients that properly set ciaddr and come to the
2180 server via a relay aget has been repaired.
2184 - A warning that host statements declared within subnet or shared-network
2185 scopes are actually global has been added.
2187 - The default minimum lease time (if min-lease-time was not specified)
2188 was raised from 0 to 300. 0 is not thought to be sensible, and is
2189 known to be damaging.
2191 - Added additional fatal error sanity checks surrounding lease binding
2192 state count calculations (free/active counts used for failover pool
2195 - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
2196 misapplied to server values rather than client values. The server no longer
2197 advertises 8-byte lease-time options when on 64-bit platforms.
2199 - A bug where leases not in ACTIVE state would get billed to billed classes
2200 (classes with lease limitations) was fixed. Non-active leases OFFERed
2201 to clients are no longer billed (but billing is checked before offering).
2203 - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
2204 configuration option - the default configuration and results should be
2207 - If the dhclient were to receive a DHCPNAK while it was in the RENEW
2208 state (and consequently, had an active, 'bound' address and related
2209 configuration options), it would fail to 'tear down' this information
2210 before proceeding into INIT state. dhclient now iterates the dhclient-
2211 script with the 'EXPIRE' action to cause these teardowns prior to entering
2212 INIT state. Thanks to a patch from Chris Zimmerman.
2214 - The omapi.1 manpage had some formatting errors repaired thanks to a patch
2215 from Yoshihiko Sarumaru.
2217 - A few lines of code that were failover-specific were moved within
2218 #if defined() clauses so that compilation without failover could be
2221 - The log message emitted when the 'leased-address' value was not available
2222 in dhcpd.conf "executable statements" has been updated to be more helpful.
2223 Manpage information for this value has also been updated.
2225 - Abandoned or dissociated (err condition) leases now remove any related
2226 dynamic dns bindings. Thanks to a patch from Patrick Schoo.
2228 - Attempting to write a new lease file to replace a corrupt (due to
2229 encountering non-retryable errors during writing) lease file should
2230 no longer result in an infinite recursion.
2232 - Host declaration hardware addresses and client identifiers may only be
2233 configured once. dhcpd will now fail to load config files that specify
2234 multiple identifiers (previous versions would silently over-ride the
2235 value with the later configured value).
2237 - Several option codes that have been allocated since our last release
2238 have been named and documented.
2240 - Option names of the form "unknown-123" have been removed from the in-
2241 memory hash tables. In order to support options of these names that
2242 may appear in dhclient.leases or similar in previous versions, the
2243 parser will now find the new option code definition, or mock up a
2244 generic option code definition. This should result in a smooth
2245 transition from one name to the other, as the new name is used to
2248 Changes since 3.0.4rc1
2250 - The dhcp-options.5 manpage was updated to correct indentation errors
2251 thanks to a patch from Jean Delvare.
2253 Changes since 3.0.4b3
2255 - Some manual pages were clarified pursuant to discussion on the dhcp-server
2258 Changes since 3.0.4b2
2260 - Null-termination sensing for certain clients that unfortunately require
2261 it in DHCPINFORM processing was repaired.
2263 - The host-name option and a few others were moved from "X" format to "t"
2264 format to be compatible with new NULL handling functions.
2266 - DHCPINFORM processing is a little more careful about return addressing
2267 its responses, or if responding via a relay. The INFORM related
2268 messages also log the 'effective client ip address' rather than the
2269 client's supplied ciaddr (since some clients produce null ciaddrs).
2271 - The server was inappropriately sending leases to the RESET state in the
2272 event that multiple active leases were found to match a singly-identified
2273 client. This was changed to RELEASED (by accepting a different, ACTIVE
2274 binding, the client is implicitly releasing its lease). This repairs a
2275 bug wherein secondary servers in failover pairs detecting this condition
2276 move leases to RESET, and primaries refuse to accept that state
2277 transition (properly).
2279 - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
2281 Changes since 3.0.4b1
2283 - Command line parsing in omshell was repaired - it no longer closes
2284 STDIN after reading one line.
2286 - The resolver library no longer closes the /etc/resolv.conf file
2287 descriptor it opened twice.
2289 - Changes to trailing NULL removal in 't' option-atoms has been rethought,
2290 it now includes 'd' (domain name) types, and tries hard not to rewind an
2291 option beyond the start of the text field it is un-terminating.
2295 - A DDNS update handling function was misusing the DNS error codes, rather
2296 than the internal generic result enumeration. The result is a confusing
2297 syslog line, logging the wrong condition.
2299 - The DHCP Server was not checking pool balance in the case where it brought
2300 a non-ACTIVE lease out of storage for a client that was returning to use
2301 a lease it once had long ago, and had since expired.
2303 - Failover peers no longer bother to look for free leases to allocate when
2304 they already found the client's ACTIVE lease. DISCOVERs are load balanced
2305 whether freely-allocated or not, unless the server doubts the peer has
2308 - Fixed a bug in dhcrelay agent addition code that suppressed trailing
2309 PAD options - it was suppressing only one trailing PAD option, rather
2310 than the entire block of them.
2312 ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
2313 option addition and stripping code. Added a few sanity checks. Although
2314 highly improbable, due to requiring the reception of a DHCP datagram well
2315 in excess of all known to be used physical MTU limitations, it is possible
2316 this may have been used in a stack overflow security vulnerability. Thanks
2317 to a patch from infamous42md.
2319 ! Added some sanity checks to OMAPI connection/authentication code.
2320 Although highly improbable, due to having to deliver in excess of 2^32
2321 bytes of data via the OMAPI channel, not to mention requiring dhcpd to
2322 be able to malloc() a memory region 2^32 bytes in size, it was possible
2323 this might have resulted in a heap overflow security vulnerability.
2324 Thanks to a patch from infamous42md.
2326 - dmalloc() memset()'s the non-debug (data) portion of the allocated
2327 memory to zero. Code that memset()'s the result returned by dmalloc() to
2328 zero is redundant. These redundancies were removed.
2330 - Some type declaration corrections to u_int16_t were made in common/tr.c
2331 (Token Ring support) thanks to a patch from Jason Vas Dias at Red Hat.
2333 - A failover bug that was allowing leases that EXPIRED or were RELEASED
2334 where tsfp and tstp are identical timestamps to languish in these
2335 transitional states has been repaired. As a side effect, lease
2336 databases should be kept more consistent overall, not just for these
2337 transitional states.
2339 - If the lease db is deleted out from under the daemon, and it moves to rewrite
2340 the db, it will go ahead with the operation and move the new db into place
2341 once it detects the old db does not exist.
2343 - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
2344 is either nonsensical or (in the case of IEEE1394) is not known to support
2345 these interfaces. Thanks to Marius Gedminas and Andrew Pollock of Debian.
2347 - Some previously undocumented reasons for dhclient-script invoking has
2348 been documented in the dhclient-script.8 manpage.
2350 - Failover potential expiry calculations (TSTP) have been corrected. Results
2351 should be substantially more consistent, and proper given the constraints.
2353 - Adjusted lease state validation checks in potential-conflict, to
2354 account for possible clock skew similarly to normal state, and several
2355 previously illegal transitions were made legal (ex: active->released).
2357 - An impossible sanity check was removed from omapi/buffer.c, thanks to a
2358 patch from 'infamous42md'.
2360 - An OMAPI host/network byte order problem in lease time values has been
2363 - Several minor bugs, largely relating to treating 8-byte time values as
2364 4-byte entities, have been repaired after careful review of the FreeBSD
2365 ports collection's patch set. Thanks to the nameless entities who have
2366 contributed to the FreeBSD ports.
2368 - When writing a trace file, the file is now created with permissions 0600,
2369 to help administrators avoid accidentally publicising sensitive config
2372 - The calculation of the maximum size of DHCP packets no longer includes
2373 Ethernet framing overhead. The result is that the 'Maximum Message
2374 Size' option advertised by clients, or the default value 576, is no
2375 longer reduced by 14 bytes, and instead directly reflects the IP level
2376 MTU (and the default, minimum allowed IP MTU of 576).
2378 - The special status of RELEASED/EXPIRED/RESET leases when a server
2379 is operating in partner-down was fixed. It no longer requires a
2380 lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
2381 event to turn these into FREE leases without peer acknowledgement
2382 (after STOS+MCLT) has been repaired.
2384 - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
2387 - "append"ing a string onto the end of a "t" type option (such as the
2388 domain-name field) that had been improperly NULL-terminated by the
2389 DHCP server will no longer result in a truncated string containing
2390 only the option from the server, and not the expected appended value.
2391 Thanks to a patch from Jason Vas Dias at Red Hat.
2393 - File handlers on configuration state (config files and lease dbs) should
2394 be treated consistently, regardless of whether TRACING is defined or not.
2396 - The Linux build environment has had some minor improvements - better
2397 sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
2398 and corrections to #if operators regarding LINUX_MAJOR should it ever
2401 - The server now tries harder to survive the condition where it is unable
2402 to open a new lease file to rewrite the lease state database.
2404 Changes since 3.0.3b3
2406 - dhclient.conf documentation for interface {} was updated to reflect recent
2407 discussion on the dhcp-hackers mailing list.
2409 - In response to reports that the software does not compile on GCC 4.0.0,
2410 -Werror was removed from Makefile.conf for all platforms that used it.
2411 We will address the true problem in a future release; this is a temporary
2414 Changes since 3.0.3b2
2416 - An error in code changes introduced in 3.0.3b2 was corrected, which caused
2417 static BOOTP clients to receive random addresses.
2419 Changes since 3.0.3b1
2421 - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
2422 host records would be left behind on leases that were not allocated to the
2423 client currently booting (eg in the case where the host was denied booting).
2425 - The dhcpd.conf.5 manpage was updated to be more clear in regards to
2426 multiple host declarations (thanks to Vincent McIntyre). 'Interim' style
2427 dynamic updates were also retouched.
2431 - A bug was fixed where a server might load balance a DHCP REQUEST to its
2432 peer after already choosing not to load balance the preceding DISCOVER.
2433 The peer cannot allocate the originating server's lease.
2435 - In the case where a secondary server lost its stable storage while the
2436 primary was still in communications-interrupted, and came back online,
2437 the lease databases would not be fully transferred to the secondary.
2438 This was due to the secondary errantly sending an extra UPDREQ message
2439 when the primary made its state transition to PARTNER-DOWN known.
2441 - The package will now compile cleanly in gcc 3.3 and 3.4. As a side effect,
2442 lease structures will be 9 bytes smaller on all platforms. Thanks to
2443 Jason Vas Dias at Red Hat.
2445 - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
2446 properly restricted to only detecting broadcast interfaces. Thanks
2447 to a patch from Jason Vas Dias at Red Hat.
2449 - decode_udp_ip_header was changed so that the IP address was copied out
2450 to a variable, rather than referenced by a pointer. This enforces 4-byte
2451 alignment of the 32-bit IP address value. Thanks to a patch from Dr.
2454 - An incorrect log message was corrected thanks to a patch from
2457 - A bug in DDNS was repaired, where if the server's first DDNS action was
2458 a DDNS removal rather than a DDNS update, the resolver library's
2459 retransmit timer and retry timer was set to the default, implying a
2460 15 second timeout interval. Which is a little excessive in a synchronous,
2461 single-threaded system. In all cases, ISC DHCP should now hold fast to
2462 a 1-second timeout, trying only once.
2464 - The siaddr field was being improperly set to the server-identifier when
2465 responding to DHCP messages. RFC2131 clarified the siaddr field as
2466 meaning the 'next server in the bootstrap process', eg a tftp server.
2467 The siaddr field is now left zeroed unless next-server is configured.
2469 - mockup_lease() could have returned in an error condition (or in the
2470 condition where no fixed-address was found matching the shared
2471 network) with stale references to a host record. This is probably not
2472 a memory leak since host records generally never die anyway.
2474 - A bug was repaired where failover servers would let stale client identifiers
2475 persist on leases that were reallocated to new clients not sending an id.
2477 - Binding scopes ("set var = value;") are now removed from leases allocated
2478 by failover peers if the lease had expired. This should help reduce the
2479 number of stale binding scopes on leases.
2481 - A small memory leak was closed involving client identifiers larger than
2482 7 bytes, and failover.
2484 - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
2485 cause an internal function to overflow heap. Thanks to Jason Vas Dias
2488 - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
2489 or 'NUMBER_OR_NAME' was repaired. Hexadecimal parsing is affected, and
2492 - In several cases, parse warnings were being issued before the lexical
2493 token had been advanced to the token whose value was causing an error...
2494 causing parse warnings to claim the problem is on the wrong token.
2496 - Host declarations matching on client identifier for dynamic leases will
2497 no longer match fixed-address host declarations (this is now identical
2498 to behaviour for host records matching on hardware address).
2500 Changes since 3.0.2rc3
2502 - A previously undocumented configuration directive, 'local-address',
2503 was documented in the dhcpd.conf manpage.
2505 Changes since 3.0.2rc2
2507 - Two variables introduced in 3.0.2b1 were used without being initialized
2508 in the case where neither the FILE nor SNAME fields were available for
2509 overloading. This was repaired.
2511 - A heretofore believed to be impossible corner case of the option
2512 overloading implementation turned out to be possible ("Unable to sort
2513 overloaded options after 10 tries."). The implementation was reworked
2514 to consider the case of an option so large it would require more than
2515 three chunks to fit.
2517 - Many other instances of variables being used without being initialized
2520 - An uninitialized variable in omapi_io_destroy() led to the discovery
2521 that this function may result in orphaned pointers (and hence, a memory
2524 Changes since 3.0.2rc1
2526 - allocate_lease() was rewritten to repair a bug in which the server would
2527 try to allocate an ABANDONED lease when FREE leases were available.
2529 Changes since 3.0.2b1
2531 - Some dhcp-eval.5 manpage formatting was repaired.
2535 - A bug was fixed in the server's 'option overloading' implementation,
2536 where options loaded into the 'file' and 'sname' packet fields were
2537 not aligned precisely as rfc2131 dictates.
2539 - The FreeBSD client script was changed to support the case where a domain
2540 name was not provided by the server.
2542 - A memory leak in 'omshell' per each command line parsed was
2543 repaired, thanks to a patch from Jarkko Torppa.
2545 - Log functions writing to stderr were adjusted to use the STDERR_FILENO
2546 system definition rather than '2'. This is a no-op for 90% of platforms.
2548 - One call to trace_write_packet_iov() counted the number of io vectors
2549 incorrectly, causing inconsistent tracefiles. This was fixed.
2551 - Some expression parse failure memory leaks were closed.
2553 - A host byte order problem in tracefiles was repaired.
2555 - Pools configured in DHCPD for failover possessing permission lists that
2556 previously were assumed to not include dyanmic bootp clients are now
2557 a little more pessimistic. The result is, dhcpd will nag you about just
2558 about most pools that possess a 'allow' statement with no 'deny' that
2559 would definitely match a dynamic bootp client.
2561 - The 'ddns-update-style' configuration warning bit now insists that
2562 the configuration be globally scoped.
2564 - Two memory leaks in dhclient were closed thanks to a patch from Felix
2567 - Some minor but excellently pedantic documentation errors were fixed
2568 thanks to a patch from Thomas Klausner.
2570 - Bugs in operator precedence in executable statements have been repaired
2571 once again. More legal syntaxes should be parsed legally.
2573 - Failing to initialize a tracefile for any reason if a tracefile was
2574 specified is now a fatal error. Thanks to a patch from Albert Herranz.
2576 - Corrected a bug in which the number of leases transferred as calculated
2577 by the failover primary and sent to peers in POOLRESP responses may be
2578 incorrect. This value is not believed to be used by other failover
2579 implementations, excepting perhaps as logged information.
2581 - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
2582 sending POOLREQ messages instead of POOLRESP mesasges. This message
2583 was essentially ignored since failover secondaries effectively do not
2584 respond to POOLREQ messages.
2586 - Type definitions for various bitwidths of integers in the sunos5-5
2587 build of ISC DHCP have been fixed. It should compile and run more
2588 easily when built in 64-bit for this platform.
2590 - "allow known-clients;" is now a legal syntax, to avoid confusion.
2592 - If one dhcp server chooses to 'load balance' a request to its failover
2593 peer, it first checks to see if it believes said peer has a free
2594 lease to allocate before ignoring the DISCOVER.
2596 - log() was logging a work buffer, rather than the value returned by
2597 executing the statements configured by the user. In some cases,
2598 the work buffer and the intended results were the same. In some other
2599 cases, they were not. This was fixed thanks to a patch from Gunnar
2600 Fjone and directconnect.no.
2602 - Compiler warnings for some string type conversions was fixed, thanks
2603 to Andreas Gustafsson.
2605 - The netbsd build environments were simplified to one, in which
2606 -Wconversion is not used, thanks to Andreas Gustafsson.
2608 - How randomness in the backoff-cutoff dhclient configuration variable
2609 is implemented was better documented in the manpage, and the behaviour
2610 of dhclient in REQUEST timeout handling was changed to match that of
2611 DISCOVER timeout handling.
2613 - Omapi was hardened against clients that pass in null values, thanks
2614 to a patch from Mark Jason Dominus.
2616 - A bug was fixed in dhclient that kept it from doing client-side
2617 ddns updates. Thanks to a patch from Andreas Gustafsson, which
2618 underwent some modification after review by Jason Vas Dias.
2620 - Failover implementations disconnected due to the network between
2621 them (rather than one of the two shutting down) will now try to
2622 re-establish the failover connection every 5 seconds, rather than
2623 to simply try once and give up until one of them is restarted.
2624 Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
2625 by Greger V. Teigre which led to an enhancement to it.
2627 - A problem that kept DHCP Failover secondaries from tearing down
2628 ddns records was repaired. Thanks to a patch from Ulf Ekberg from
2631 - 64bit pointer sizes are detected properly on FreeBSD now.
2633 - A bug was repaired where the DHCP server would leave stale references
2634 to host records on leases it once thought about offering to certain
2635 clients. The result would be to apply host and 'known' scopes to the
2636 wrong clients (possibly denying booting). NOTE: The 'mis-host' patch
2637 that was being circulated as a workaround is not the way this bug was
2638 fixed. If you were a victim of this bug in 3.0.1, you are cautioned
2639 to proceed carefully and see if it fixes your problem.
2641 - A bug was repaired in the server's DHCPINFORM handling, where it
2642 tried to divine the client's address from the source packet and
2643 would get it wrong. Thanks to Anshuman Singh Rawat.
2645 - A log message was introduced to help illuminate the case where the
2646 server was unable to find a lease to assign to any BOOTP client.
2647 Thanks to Daniel Baker.
2649 - A minor dhcpd.conf.5 manpage error was fixed.
2651 Changes since 3.0.1rc14
2653 - The global variable 'cur_time' was centralized and is now uniformly of a
2654 type #defined in system-dependent headers. It had previously been defined
2655 in one of many places as a 32-bit value, and this causes mayhem on 64-bit
2656 big endian systems. It probably wasn't too healthy on little endian
2659 - A printf format string error introduced in rc14 was repaired.
2661 - AIX system-dependent header file was altered to only define NO_SNPRINTF
2662 if the condition used to #ifdef in vsnprintf in AIX' header files
2665 - The Alpha/OSF system-dependent header file was altered to define
2666 NO_SNPRINTF on OS revisions older than 4.0G.
2668 - omapip/test.c had string.h added to its includes.
2670 Changes since 3.0.1rc13
2672 ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
2673 in logging messages with excessively long hostnames provided by the
2674 clients. It is highly probable that these could have been used by
2675 attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
2676 release candidates 12 or 13. Special thanks to Gregory Duchemin for
2677 both finding and solving the problem.
2679 ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
2680 in log_*() functions was evidenced, on some specific platforms where
2681 vsnprintf() was not believed to be available and calls were wrapped to
2682 sprintf() instead. Again, credit goes to Gregory Duchemin for finding
2683 the problem. Calls to snprintf() are now linked to a distribution-local
2684 snprintf implementation, only in those cases where the architecture is
2685 not known to provide one (see includes/cf/[arch].h). If you experience
2686 linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
2687 is where to look. This vulnerability did not exist in any previously
2688 published version of ISC DHCP.
2690 - Compilation on hpux 11.11 was repaired.
2692 - 'The cross-compile bug fix' was backed out.
2694 Changes since 3.0.1rc12
2696 - Fixed a bug in omapi lease lookup function, to form the hardware
2697 address for the hash lookup correctly, thanks to a patch from
2700 - Fixed a bug where dhcrelay was sending relayed responses back to the
2701 broadcast address, but with the source's unicast mac address. Should
2702 now conform to rfc2131 section 4.1.
2704 - Cross-compile bug fix; use $(AR) instead of ar. Thanks to Morten Brorup.
2706 - Fixed a crash bug in dhclient where dhcpd servers that do not provide
2707 renewal times results in an FPE. As a side effect, dhclient can now
2708 properly handle 0xFFFFFFFF (-1) expiry times supplied by servers. Thanks
2709 to a patch from Burt Silverman.
2711 - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
2712 and reformatted to correct a compilation error on Solaris platforms.
2714 - A patch was applied which fixes a case where leases read from the
2715 leases database do not properly over-ride previously read leases.
2717 - dhcpctl.3 manpage was tweaked.
2719 Changes since 3.0.1rc11
2721 - A patch from Steve Campbell was applied with minor modifications to
2722 permit reverse dns PTR record updates with values containing spaces.
2724 - A patch from Florian Lohoff was applied with some modifications to
2725 dhcrelay. It now discards packets whose hop count exceeds 10 by default,
2726 and a command-line option (-c) can be used to set this threshold.
2728 - A failover bug relating to identifying peers by name length instead of
2731 - Declaring failover configs within shared-network statements should no
2732 longer result in error.
2734 - The -nw command line option to dhclient now works.
2736 - Thanks to a patch from Michael Richardson:
2737 - Some problems with long option processing have been fixed.
2738 - Some fixes to minires so that updates of KEY records will work.
2740 - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
2741 see contrib/ms2isc/readme.txt for revision notes.
2743 - Dhclient no longer uses shell commands to kill another instance of
2744 itself, it sends the signal directly. Thanks to a patch from Martin
2747 - The FreeBSD dhclient-script was changed so that a failure to write to
2748 /etc/resolv.conf does not prematurely end the script. This keeps dhclient
2749 from looping infinitely when this is the case. Thanks to a patch from
2752 - A patch from Bill Stephens was applied which resolves a problem with lease
2753 expiry times in failover configurations.
2755 - A memory leak in configuration parsing was closed thanks to a patch from
2758 - The function which discovers interfaces will now skip non-broadcast or
2759 point-to-point interfaces, thanks to a patch from David Brownlee.
2761 - Options not yet known by the dhcpd or dhclient have had their names
2762 changed such that they do not contain # symbols, in case they should ever
2763 appear in a lease file. An option that might have been named "#144" is
2766 - Another patch from Bill Stephens which allows the ping-check timeout to
2767 be configured as 'ping-timeout'. Defaults to 1.
2769 Changes since 3.0.1rc10
2771 - Potential buffer overflows in minires repaired.
2773 - A change to the linux client script to use /bin/bash, since /bin/sh may
2776 - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
2778 - A correction of boolean parsing syntax validation - some illegal syntaxes
2779 that worked before are now detected and produce errs, some legal syntaxes
2780 that errored before will now work properly.
2782 - Some search-and-replace errors that caused some options to change their
2785 - Shu-min Chang of the Intel corporation has contributed a perl script and
2786 module that converts the MS NT4 DHCP configuration to a ISC DHCP3
2789 - Applied the remainder of the dhcpctl memory leak patch provided by Bill
2790 Squier at ReefEdge, Inc. (groo@reefedge.com).
2792 - Missing non-optional failover peer configurations will now result in a soft
2793 error rather than a null dereference.
2795 Changes since 3.0.1rc9
2797 - A format string was corrected to fix compiler warnings.
2799 - A number of spelling corrections were made in the man pages.
2801 - The dhclient.conf.5 man page was changed to refer to do-forward-updates
2802 rather than a configuration option that doesn't exist.
2804 - A FreeBSD-specific bug in the interface removal handling was fixed.
2806 - A Linux-specific Token Ring detection problem was fixed.
2808 - Hashes removed from as-yet-unknown agent options, having those options
2809 appear in reality before we know about them will no longer produce
2810 self-corrupting lease databases.
2812 - dhclient will use the proper port numbers now when using the -g option.
2814 - A order-of-operations bug with 2 match clauses in 1 class statement is
2815 fixed thanks to a patch from Andrew Matheson.
2817 - Compilation problems on Solaris were fixed.
2819 - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
2821 - A fix to the dhcp ack process which makes certain group options will be
2822 included in the first DHCPOFFER message was made thanks to a patch from
2825 - A few memory leaks were repaired thanks to patches from Bill Squier at
2826 ReefEdge, Inc. (groo@reefedge.com).
2828 - A fix for shared-networks that sometimes give clients options for the
2829 wrong subnets (in particular, 'option routers') was applied, thanks to
2830 Ted Lemon for the patch.
2832 - Omshell's handling of dotted octets as values was changed such that dots
2833 one after the other produce zero values in the integer string.
2835 Changes since 3.0.1rc8
2837 - Fix a format string vulnerability in the server that could lead to a
2838 remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
2840 - Add additional support for NetBSD/sparc64.
2842 - Fix a bug in the command-line parsing of the client. Also, resolve
2845 - Add better support for shells other than bash in the Linux client
2848 - Various build fixes for modern versions of FreeBSD and Linux.
2850 - Fix a bad bounds check when printing binding state names.
2852 - Clarify documentation about fixed-address and multiple addresses.
2854 - Fix a typo in the authoritative error message.
2856 - Make a log entry when we can't write a billing class.
2858 - Use conversion targets that are the right size on all architectures.
2860 - Increment the hop count when relaying.
2862 - Log a message when lease state is changed through OMAPI.
2864 - Don't rerun the shared_network when evaluating the pool.
2866 - Fix a reversed test in the parser.
2868 - Change the type of rbuf_max.
2870 - Make FTS_LAST a manifest constant to quiet warnings.
2872 Changes since 3.0.1rc7
2874 - Fix two compiler warnings that are generated when compiling on Solaris
2875 with gcc. These stop the build, even though they weren't actually
2876 errors, because we prefer that our builds generate no warnings.
2878 Changes since 3.0.1rc6
2880 - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
2883 - Implement lease stealing for cases where the primary has fewer leases
2884 than the secondary, as called for by the standard.
2886 - Add a fudge factor to the lease expiry acceptance code, (suggested
2887 by Kevin Miller of CMU).
2889 - Fix a bug in permit_list_match that made it much too willing to say
2890 that two permit lists matched.
2892 - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
2893 also more compact) messages about DNS updates.
2895 - Fix a bug in generating wire-format domain names for the FQDN option.
2897 - Fix a bug where the FQDN option would not be returned if the client
2898 requested it, contrary to the standard.
2900 - On Darwin, use the FreeBSD DHCP client script.
2902 - On NetBSD/sparc, don't check for casting warnings.
2904 - Add a flag in the DHCP client to disable updating the client's A
2905 record when sending an FQDN option indicating that the client is
2906 going to update its A record.
2908 - In the client, don't attempt a DNS update until one second after
2909 configuring the new IP address, and if the update times out, keep
2910 trying until a response, positive or negative, is received from the
2913 - Fix an uninitialized memory bug in the DHCP client.
2915 - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
2917 - Fix a bug in ns_parserr(), where it was returning the wrong sort
2918 of result code in some cases (suggested by Ben Harris of the
2921 - Fix a bug in is_identifier(), where it was checking against EOF
2922 instead of the END_OF_FILE token (also suggested by Ben Harris).
2924 - Fix a bug where if an option universe contained no options, the
2925 DHCP server could dump core (Walter Steiner).
2927 - Fix a bug in the handling of encapsulated options.
2929 - Fix a bug that prevented NWIP suboptions from being processed.
2931 - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
2932 as modifier flags to the FTS_ACTIVE state, as called for in the
2933 failover protocol standard.
2935 - Fix bugs in the pool merging code that resulted in references and
2936 dereferences of null pointers. This bug had no impact unless the
2937 POINTER_DEBUG flag was defined.
2939 - In the server, added a do-forward-updates flag that can be used to
2940 disable forward updates in all cases, so that sites that want the
2941 clients to take sole responsibility for updating their A record can
2944 - Make it possible to disable optimization of PTR record updates.
2946 Changes since 3.0.1rc5
2948 - Include some new documentation and changes provided by Karl Auer.
2950 - Add a workaround for some Lexmark printers that send a double-NUL-
2951 terminated host-name option, which would break DNS updates.
2953 - Fix an off-by-one error in the MAC-address checking code for
2954 DHCPRELEASE that was added in 3.0.1rc5.
2956 - Fix a bug where client-specific information was not being discarded
2957 from the lease when it expired or was released, resulting in
2958 problems if the lease was reallocated to a different client.
2960 - If more than one allocation pool is specified that has the same set
2961 of constraints as another allocation pool on the same shared
2962 network, merge the two pools.
2964 - Don't print an error in fallback_discard, since this just causes
2965 confusion and does not appear to be helping to encourage anyone to
2968 Changes since 3.0.1rc4
2970 - Fix a bug that would cause the DHCP server to spin if asked to parse
2971 a certain kind of incorrect statement.
2973 - Fix a related bug that would prevent an error from being reported in
2976 - Additional documentation.
2978 - Make sure that the hardware address matches the lease when
2979 processing a DHCPRELEASE message.
2981 Changes since 3.0.1rc3
2983 - A minor bug fix in the arguments to a logging function call.
2984 - Documentation update for dhcpd.conf.
2986 Changes since 3.0.1rc2
2988 - Allow the primary to send a POOLREQ message. This isn't what the current
2989 failover draft says to do, so we may have to back it out if I can't get the
2990 authors to relent, but the scheme for balancing that's specified in the
2991 current draft seems needlessly hairy, so I'm floating a trial balloon.
2992 The rc1 code did not implement the method described in the draft either.
2994 Changes since 3.0.1rc1
2996 - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
2997 domain or RRSET. This allows the DHCP server to forget about a name
2998 it added to the DNS once it's been removed, even if the DHCP server
2999 wasn't the one that removed it.
3001 - Install defaults for failover maximum outstanding updates and maximum
3002 silent time. This prevents problems that might occur if these values
3003 were not configured.
3005 - Don't do DDNS deletes if ddns-update-style is none.
3007 - Return relay agent information options in DHCPNAK. This prevents DHCPNAK
3008 messages from being dropped when the relay agent information option contains
3009 routing information.
3011 - Fix a problem where coming up in recover wouldn't result in an update
3014 - Add some more chatty messages when we start a recovery update and when it's
3017 - Fix a possible problem where some state might have been left around
3018 after the peer lost contact and regained contact about how many updates
3021 - Don't nix a lease update because of a lease conflict. This test has
3022 never (as far as I know) prevented a mistake, and it appears to cause
3023 problems with failover.
3025 - Add support in rc history code for keeping a selective history, rather
3026 than a history of all references and dereferences. This code is only used
3027 when extensive additional debugging is enabled.
3031 - Make allocators for hash tables. As a side effect, this fixes a memory
3032 smash in the subclass allocation code.
3034 - Fix a small bug in omshell where if you try to close an object when
3035 no object is open, it dumps core.
3037 - Fix an obscure coredump that could occur on shutdown.
3039 - Fix a bug in the recording of host declaration rubouts in the lease file.
3041 - Fix two potential spins in the host deletion code.
3043 - Fix a core dump that would happen if an application tried to update
3044 a host object attribute with a null value.
3046 Changes since 3.0 Release Candidate 12
3048 - Fix a memory leak in the evaluation code.
3050 - Fix an obscure core dump.
3052 - Print a couple of new warnings when parsing the configuration file
3053 when crucial information is left out.
3055 - Log "no free leases" as an error.
3057 - Documentation updates.
3059 Changes since 3.0 Release Candidate 11
3061 - Always return a subnet selection option if one is sent.
3063 - Fix a warning that was being printed because an automatic data
3064 structure wasn't zeroed.
3066 - Fix some failover state transitions that were being handled
3069 - When supersede_lease is called on a lease whose end time has already
3070 expired, but for which a state transition has not yet been done, do
3071 a state transition. This fixes the case where if the secondary
3072 allocated a lease to a client and the lease "expired" while the
3073 secondary was in partner-down, no expiry event would actually
3074 happen, so the lease would remain active until the primary was
3077 Changes since 3.0 Release Candidate 10
3079 - Fix a bug that was preventing released leases from changing state
3080 in failover-enabled pools.
3082 - Fix a core dump in the client identifier finder code (for host
3085 - Finish fixing a bug where bogus data would sometimes get logged to
3086 the dhclient.leases file because it was opened as descriptor 2.
3088 - Fix the Linux dhclient-script according to suggestions made by
3089 several people on the dhcp-client mailing list.
3091 - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
3093 - Print an error message and refuse to run if a failover peer is
3094 defined but not referenced by any pools.
3096 - Correct a confusing error message in failover.
3098 Changes since 3.0 Release Candidate 9
3100 - Fix a bug in lease allocation for Dynamic BOOTP clients.
3102 Changes since 3.0 Release Candidate 8 Patchlevel 2
3104 - Fix a bug that prevented update-static-leases from working.
3106 - Document failover-state OMAPI object.
3108 - Fix a compilation error on SunOS 4.
3110 Changes since 3.0 Release Candidate 8 Patchlevel 1
3112 - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
3113 This was introduced in rc8pl1 as an unintended result of the memory
3114 leakage fixes that were in pl1.
3116 - Fix a long-standing bug where the server would record that an update
3117 had been done for a client with no name, even though no update had
3118 been done, and then when the client's lease expired the deletion of
3119 that nonexistant record would time out because the name was the null
3122 - Clean up the omshell, dhcpctl and omapi man pages a bit.
3124 Changes since 3.0 Release Candidate 8
3126 - Fix a bug that could cause the DHCP server to spin if
3127 one-lease-per-client was enabled.
3129 - Fix a bug that was causing core dumps on BSD/os in the presence of
3132 - In partner-down state, don't restrict lease lengths to MCLT.
3134 - On the failover secondary, record the MCLT received from the primary
3135 so that if we come up without a connection to the primary we don't
3136 wind up giving out zero-length leases.
3138 - Fix some compilation problems on BSD/os.
3140 - Fix a bunch of memory leaks.
3142 - Fix a couple of bugs in the option printer.
3144 - Fix an obscure error reporting bug in the dns update code, and also
3145 make the message clearer when a key algorithm isn't supported.
3147 - Fix a bug in the tracing code that prevented trace runs that used
3148 tcp connections from being played back.
3150 - Add some additional debugging capability for catching memory leaks
3153 - Make the client release the lease correctly on shutdown.
3155 - Add some configurability to the build system.
3157 - Install omshell manual page in man1, not man8.
3159 - Craig Gwydir sent in a patch that fixes a long-standing bug in the
3160 DHCP client that could cause core dumps, but that for some reason
3161 hadn't been noticed until now.
3163 Changes since 3.0 Release Candidate 7
3165 - Fix a bug in failover where we weren't sending updates after a
3166 transition from communications-interrupted to normal.
3168 - Handle expired/released/reset -> free transition according to the
3169 protocol specification (this works - the other way not only wasn't
3170 conformant, but also didn't work).
3172 - Add a control object in both client and server that allows either
3173 daemon to be shut down cleanly.
3175 - When writing a lease, if we run out of disk space, shut down the
3176 output file and insist on writing a new one before proceeding.
3178 - In the server, if the OMAPI listener port is occupied, keep trying
3179 to get it, rather than simply giving up and exiting.
3181 - Support fetching variables from leases and also updating and adding
3182 variables to leases via OMAPI.
3184 - If two failover peers have wildly different clocks, refuse to start
3187 - Fix a bug in the DNS update code that could cause core dumps when
3188 running on alpha processors.
3190 - Fixed a bug in ddns updates for static lease entries, thanks to a
3191 patch from Andrey M Linkevitch.
3193 - Add support for Darwin/MacOS X
3195 - Install omshell (including new documentation).
3197 - Support DNS updates in the client (this is a very obscure feature
3198 that most DHCP client users probably will not be able to use).
3200 - Somewhat cleaner status logging in the client.
3202 - Make OMAPI key naming syntax compatible with the way keys are
3203 actually named (key names are domain names).
3205 - Fix a bug in the lease file writer.
3207 - Install DHCP ISC headers in a different place than BIND 9 ISC
3208 headers, to avoid causing trouble in BIND 9 builds.
3210 - Don't send updates for attributes on an object when the attributes
3211 haven't changed. Support deleting attributes on remote objects.
3213 - Fix a number of bugs in omshell, and add the unset and refresh
3216 - Handle disconnects in OMAPI a little bit more intelligently (so that
3217 the caller gets ECONNRESET instead of EINVAL).
3219 - Fix a bunch of bugs in the handling of clients that have existing
3220 leases when the try to renew their leases while failover is
3223 Changes since 3.0 Release Candidate 6
3225 - Fix a core dump that could happen when processing a DHCPREQUEST from
3226 a client that had a host declaration that contained both a
3227 fixed-address declaration and a dhcp-client-identifier option
3228 declaration, if the client identifier was longer than nine bytes.
3230 - Fix a memory leak that could happen in certain obscure cases when
3231 using omapi to manipulate leases.
3233 - Fix some bugs and omissions in omshell.
3235 Changes since 3.0 Release Candidate 5
3237 - Fix a bug in omapi_object_dereference that prevented objects in
3238 chains from having their reference counts decreased on dereference.
3240 - Fix a bug in omapi_object_dereference that would prevent object
3241 chains from being freed upon removal of the last reference external
3244 - Fix a number of other memory leaks in the OMAPI protocol subsystem.
3246 - Add code in the OMAPI protocol handler to trace memory leakage.
3248 - Clean up the memory allocation/reference history printer.
3250 - Support input of dotted quads and colon-separated hex lists as
3251 attribute values in omshell.
3253 - Fix a typo in the Linux interface discovery code.
3255 - Conditionalize a piece of trace code that wasn't conditional.
3257 Changes since 3.0 Release Candidate 4
3259 - Fix a bug that would prevent leases from being abandoned properly on
3262 - Fix failover peer OMAPI support.
3264 - In failover, correctly handle expiration of leases. Previously,
3265 leases would never be reclaimed because they couldn't make the
3266 transition from EXPIRED to FREE.
3268 - Fix some broken failover state transitions.
3270 - Documentation fixes.
3272 - Take out an unnecessary check in DHCP relay agent information option
3273 stashing code that was preventing REBINDING clients from rebinding.
3275 - Prevent failover peers from allocating leases in DHCPREQUEST
3276 processing if the lease belongs to the other server.
3278 - Record server version in lease file introductory comment.
3280 - Correctly report connection errors in OMAPI and failover.
3282 - Make authentication signature algorithm name comparisons in OMAPI
3285 - Fix compile problem on SunOS 4.x
3287 - If a signature algorithm is not terminated with '.', terminate it so
3288 that comparisons between fully-qualified names will work
3291 - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
3292 systems with the probe not working correctly.
3294 - Don't allow user to type omapi key on command line of omshell.
3296 Changes since 3.0 Release Candidate 3
3298 - Do lease billing on startup in a way that I *think* will finally do
3299 the billing correctly - the previous method could overbill as a
3300 result of duplicate leases.
3302 - Document OMAPI server objects.
3304 Changes since 3.0 Release Candidate 2 Patchlevel 1
3306 - Fix some problems in the DDNS update code. Thanks to Albert
3307 Herranz for figuring out the main problem.
3309 - Fix some reference counting errors on host entries that were causing
3312 - Fix a byte-swap bug in the token ring code, thanks to Jochen
3315 - Fix a bug in lease billing, thanks to Jonas Bulow.
3317 Changes since 3.0 Release Candidate 2
3319 - Change the conditions under which a DHCPRELEASE is actually
3320 committed to be consistent with lease binding states rather than
3321 using the lease end time. This may fix some problems with the
3324 - Fix a bug where lease updates would fail on Digital Unix (and maybe
3325 others) because malloc was called with a size of zero.
3327 - Fix a core dump that happens when the DHCP server can't create its
3330 Changes since 3.0 Release Candidate 1 Patchlevel 1
3332 - Fix the dhcp_failover_put_message to not attempt to allocate a
3333 zero-length buffer. Some versions of malloc() fail if you try to
3334 allocate a zero-length buffer, and this was causing problems on,
3337 - Fix a case where the failover code was printing an error message
3338 when no error had occurred.
3340 - Fix a problem where when a server went down and back up again, the
3341 peer would not see a state transition and so would stay in the
3342 non-communicating state.
3344 - Be smart about going into recover_wait.
3346 - Fix a problem in the failover implementation where peers would fail
3347 to come into sync if interrupted in the RECOVER state. This could
3348 have been the cause of some problems people have reported recently.
3350 - Fix a problem with billing classes where they would not be unbilled
3351 when the client lease expired.
3353 - If select fails, figure out which descriptor is bad, and cut it out
3354 of the I/O loop. This prevents a potentially nasty spin. I
3355 haven't heard any report it in a while, but it came up consistently
3358 - Fix a bug in the relay agent where if you specified interfaces on
3359 the command line, it would fail.
3361 - Fix a couple of small bugs in the omapi connection object (no known
3364 - Add the missing 3.0 Beta 1 lease conversion script.
3366 - Read dhcp client script hooks if they exist, rather than only if
3369 Changes since 3.0 Release Candidate 1
3371 - Fix a memory smash that happens when fixed-address leases are used.
3372 ANY SITE AT WHICH FIXED-ADDRESS STATEMENTS ARE BEING USED SHOULD
3373 UPGRADE IMMEDIATELY. This has been a long-standing bug - thanks to
3374 Alvise Nobile for discovering it and helping me to find it!
3376 - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
3379 - There is a known problem with the DHCP server doing failover on
3380 Compaq Alpha systems. This patchlevel is not a release candidate
3381 because of this bug. The bug should be straightforward to fix, so
3382 a new release candidate is expected shortly.
3384 - There is a known problem in the DDNS update code that is probably a
3385 bug, and is not, as far as we know, fixed in this patchlevel.
3387 Changes since 3.0 Beta 2 Patchlevel 24
3389 - Went over problematic failover state transitions and made them all
3390 work, so that failover should now much less fragile.
3392 - Add some dhcpctl and omapi documentation
3394 - Fix compile errors when compiling with unusual predefines.
3396 - Make Token Ring work on Linux 2.4
3398 - Fix the Digital Unix BPF_WORDALIGN bug.
3400 - Fix some dhcp client documentation errors.
3402 - Update some parts of the README file.
3404 - Support GCC on SCO.
3406 Changes since 3.0 Beta 2 Patchlevel 23
3408 - Fix a bug in the DNS update code where a status code was not being
3409 checked. This may have been causing core dumps.
3411 - When parsing the lease file, if a lease declaration includes a
3412 billing class statement, and the lease already has a billing class,
3413 unbill the old class.
3415 - When processing failover transactions, where acks will be deferred,
3416 process the state transition immediately.
3418 - Don't try to use the new SIOCGIFCONF buffer size detection code on
3419 Linux 2.0, which doesn't provide this functionality.
3421 - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
3423 - Fix a problem in using the which command in the configure script.
3425 - Fix a parse error in the client when setting up an omapi listener.
3427 - Document the -n and -g flags to the client.
3429 - Make sure there is always a stdin and stdout on startup. This
3430 prevents shell scripts from accidentally writing error messages into
3431 configuration files that happen to be opened as stderr.
3433 - If an interface is removed, the client will now notice that it is
3434 gone rather than spinning. This has only been tested on NetBSD.
3436 - The client will attempt to get an address even if it can't create a
3439 - Don't overwrite tracefiles.
3441 - Fix some memory allocation bugs in failover.
3443 Changes since 3.0 Beta 2 Patchlevel 22
3445 - Apply some patches suggested by Cyrille Lefevre, who is maintaining
3446 the FreeBSD ISC DHCP Distribution port.
3448 - Fix a core dump in DHCPRELEASE.
3450 Changes since 3.0 Beta 2 Patchlevel 21
3452 - This time for sure: fix the spin described in the changes for pl20.
3454 Changes since 3.0 Beta 2 Patchlevel 20
3456 - Fix a problem with Linux detecting large numbers of interfaces (Ben)
3458 - Fix a memory smash in the quotify code, which was introduced in
3461 - Actually fix the spin described in the changes for pl20. The
3462 previous fix only partially fixed the problem - enough to get it
3463 past the regression test.
3465 Changes since 3.0 Beta 2 Patchlevel 19
3467 - Fix a bug that could cause the server to abort if compiled with
3468 POINTER_DEBUG enabled.
3470 - Fix a bug that could cause the server to spin when responding to a
3473 - Apply Joost Mulders' suggested patches for DLPI on x86.
3475 - Support NUL characters in quoted strings.
3477 - Install unformatted man pages on SunOS.
3479 Changes since 3.0 Beta 2 Patchlevel 18
3481 - Allow the server to be placed in partner-down state using OMAPI.
3484 - Implement omshell, which can be used to do arbitrary things to the
3485 server (in theory). (Damien Neil)
3487 - Fix a case where if a client had two different leases the server could
3488 actually dereference the second one when it hadn't been referenced,
3489 leading to memory corruption and a core dump. (James Brister)
3491 - Fix a case where a client could request the address of another client's
3492 lease, but find_lease wouldn't detect that the other client had it, and
3493 would attempt to allocate it to the client, resulting in a lease conflict
3496 - Fix a case where a client with more than one client identifier could be
3497 given a lease where the hardware address was correct but the client
3498 identifier was not, resulting in a lease conflict message.
3500 - Fix a problem where the server could write out a colon-separated
3501 hex list as a value for a variable, which would then not parse.
3502 The fix is to always write strings as quoted strings, with any
3503 non-printable characters quoted as octal escape sequences. So
3504 a file written the old way still won't work, but new files written
3507 - Fix documentation for sending non-standard options.
3509 - Use unparsable names for unknown options. WARNING: this will
3510 break any configuration files that use the option-nnn convention.
3511 If you want to continue to use this convention for some options,
3512 please be sure to write a definition, like this:
3514 option option-nnn code nnn = string;
3516 You can use a descriptive name instead of option-nnn if you like.
3518 - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
3519 DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
3520 result of a deceptively silly bug in supersede_lease.
3522 - Fix client script exit status check, according to a fix supplied by
3525 - Fix an endianness bug in the tracefile support, regarding ICMP
3528 - Fix a bug in the client where the medium would not work correctly if
3529 it contained quoted strings.
3531 ** there was no pl17 **
3533 Changes since 3.0 Beta 2 Patchlevel 16
3535 - Add support for transaction tracing. This allows the state of the
3536 DHCP server on startup, and all the subsequent transactions, to be
3537 recorded in a file which can then be played back to reproduce the
3538 behaviour of the DHCP server. This can be used to quickly
3539 reproduce bugs that cause core dumps or corruption, and also for
3540 tracking down memory leaks.
3542 - Incorporate some bug fixes provided by Joost Mulders for the DLPI
3543 package which should clear up problems people have been seeing on
3546 - Fix bugs in the handling of options stored as linked lists (agent
3547 options, fqdn options and nwip options) that could cause memory
3548 corruption and core dumps.
3550 - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
3551 not being send in some cases when they were needed.
3553 - Make the lease structure somewhat more compact.
3555 - Make initial failover startup *much* faster. This was researched
3556 and implemented by Damien Neil.
3558 - Add a --version flag to all executables, which prints the program
3559 name and version to standard output.
3561 - Don't rewrite the lease file every thousand leases.
3563 - A bug in nit.c for older SunOS machines was fixed by a patch sent in
3564 by Takeshi Hagiwara.
3566 - Fix a memory corruption bug in the DHCP client.
3568 - Lots of documentation updates.
3570 - Add a feature allowing environment variables to be passed to the
3571 DHCP client script on the DHCP client command line.
3573 - Fix client medium support, which had been broken for some time.
3575 - Fix a bug in the DHCP client initial startup backoff interval, which
3576 would cause two DHCPDISCOVERS to be sent back-to-back on startup.
3578 Changes since 3.0 Beta 2 Patchlevel 15
3580 - Some documentation tweaks.
3582 - Maybe fix a problem in the DLPI code.
3584 - Fix some error code space inconsistencies in ddns update code.
3586 - Support relay agents that intercept unicast DHCP messages to stuff
3587 agent options into them.
3589 - Fix a small memory leak in the relay agent option support code.
3591 - Fix a core dump that would occur if a packet was sent with no
3594 Changes since 3.0 Beta 2 Patchlevel 14
3596 - Finish fixing a long-standing bug in the agent options code. This
3597 was causing core dumps and failing to operate correctly - in
3598 particular, agent option stashing wasn't working. Agent option
3599 stashing should now be working, meaning that agent options can be
3600 used in class statements to control address allocation.
3602 - Fix up documentation.
3604 - Fix a couple of small memory leaks that would have added up
3605 significantly in a high-demand situation.
3607 - Add a log-facility configuration parameter.
3609 - Fix a compile error on some older operating systems.
3611 - Add the ability in the client to execute certain statements before
3612 transmitting packets to the server. Handy for debugging; not much
3613 practical use otherwise.
3615 - Don't send faked-out giaddr when renewing or bound - again, useful
3618 Changes since 3.0 Beta 2 Patchlevel 13
3620 - Fixed a problem where the fqdn decoder would sometimes try to store
3621 an option with an (unsigned) negative length, resulting in a core
3622 dump on some systems.
3624 - Work around the Win98 DHCP client, which NUL-terminates the FQDN
3627 - Work around Win98 and Win2k clients that will claim they want to do
3628 the update even when they don't have any way to do it.
3630 - Fix some log messages that can be printed when failover is operating
3631 that were not printing enough information.
3633 - It was possible for a DHCPDISCOVER to get an allocation even when
3634 the state machine said the server shouldn't be responding.
3636 - Don't load balance DHCPREQUESTs from clients in RENEWING and
3637 REBINDING, since in RENEWING, if we heard it, it's for us, and in
3638 REBINDING, the client wouldn't have got to REBINDING if its primary
3641 - When we get a bogus state lease binding state transition, don't do
3645 Changes since 3.0 Beta 2 Patchlevel 12
3647 - Fixed a couple of silly compile errors.
3649 Changes since 3.0 Beta 2 Patchlevel 11
3651 - Albert Herranz tracked down and fixed a subtle bug in the base64
3652 decoder that would prevent any key with an 'x' in its base64
3653 representation from working correctly.
3655 - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
3656 hang that they both spotted in the DHCP server - when
3657 one-lease-per-client was set, the code to release the "other" lease
3660 - Fix a problem with alignment of the input buffer in bpf in cases
3661 where two packets arrive in the same bpf read.
3663 - Fix a problem where the relay agent would crash if you specified an
3664 interface name on the command line.
3666 - Add the ability to conditionalize client behaviour based on the
3669 - Add support for the FQDN option, and added support for a new way of
3670 doing ddns updates (ddns update style interim) that allows more than
3671 one DHCP server to update the DNS for the same network(s). This
3672 was implemented by Damien Neil with some additional functionality
3675 - Damien added a "log" statement, so that the configuration file can
3676 be made to log debugging information and other information.
3678 - Fixed a bug that caused option buffers not to be terminated with an
3681 - Fixed a long-standing bug in the support for option spaces where the
3682 options are stored as an ordered list rather than in a hash table,
3683 which could theoretically result in memory pool corruption.
3685 - Prevent hardware declarations with no actual hardware address from
3686 being written as something unparsable, and behave correctly in the
3687 face of a null hardware address on input.
3689 - Allow key names to be FQDNs, and qualify the algorithm name if it is
3690 specified unqualified.
3692 - Modify the DDNS update code so that it never prints the "resolver
3693 failed" message, but instead says *why* the resolver failed.
3695 - Officially support the subnet selection option, which now has an
3698 - Fix a build bug on MacOS X.
3700 - Allow administrator to disable ping checking.
3702 - Clean up dhcpd.conf documentation and add more information about how
3705 Changes since 3.0 Beta 2 Patchlevel 10
3707 - Fix a bug introduced during debugging (!) and accidentally committed
3710 Changes since 3.0 Beta 2 Patchlevel 9
3712 - Fix DHCP client handling of vendor encapsulated options.
3714 - Fix a bug in the handling of relay agent information options introduced
3717 - Stash agent options on client leases by default, and use the stashed
3718 options at renewal time.
3720 - Add the ability to test the client's binding state in the client
3721 configuration language.
3723 - Fix a core dump in the DNS update code.
3725 - Fix some expression evaluation bugs that were causing updates to be
3726 done when no client hostname was received.
3728 - Fix expression evaluation debugging printfs.
3730 - Teach pretty_print_option to print options in option spaces other than
3731 the DHCP option space.
3733 - Add a warning message if the RHS of a not is not boolean.
3735 - Never select for more than a day, because some implementations of
3736 select will just fail if the timeout is too long (!).
3738 - Fix a case where a DHCPDISCOVER from an unknown network would be
3741 - Fix a bug where if a client requested an IP address for which a different
3742 client had the lease, the DHCP server would reallocate it anyway.
3744 - Fix the DNS update code so that if the client changes its name, the DNS
3745 will be correctly updated.
3747 Changes since 3.0 Beta 2 Patchlevel 8
3749 - Oops, there was another subtle math error in the header-length
3752 Changes since 3.0 Beta 2 Patchlevel 7
3754 - Oops, forgot to byte-swap udp header length before bounds-checking it.
3756 Changes since 3.0 Beta 2 Patchlevel 6
3758 - Fix a possible DoS attack where a client could cause the checksummer
3759 to dump core. This was a read, not a write, so it shouldn't be
3760 possible to exploit it any further than that.
3762 - Implement client- and server-side support for using the Client FQDN
3765 - Support for other option spaces in the client has been added. This
3766 means that it is now possible to define a vendor option space on the
3767 client, request options in that space from the server (which must
3768 define the same option space), and then use those options in the
3769 client. This also allows NWIP and Client FQDN options to be used
3772 - Add object initializer support. This means that objects can now be
3773 initialized to something other than all-zeros when allocated, which
3774 makes, e.g., the interface object support code a little more robust.
3776 - Fix an off-by-one bug in the host stuffer. This was causing host
3777 deletes not the work, and may also have been causing OMAPI
3778 connections to get dropped. Thanks to James Brister for tracking
3781 - Fixed a core dump in the interface discovery code that is triggered
3782 when there is no subnet declaration for an interface, but the server
3783 decides to continue running. Thanks to Shane Kerr for tracking
3784 down and fixing this problem.
3786 Changes since 3.0 Beta 2 Patchlevel 5
3788 - Fix a bug in the recent enhancement to the interface discovery code
3789 to support arbitrary-length interface lists.
3791 - Support NUL-terminated DHCP options when initializing client-script
3794 - Fix suffix operator.
3796 - Fix NetWare/IP option parsing.
3798 - Better error/status checking in dhcpctl initialization and omapi
3801 - Fix a potential memory smash in dhcpctl code.
3803 - Fix SunOS4 and (maybe) Ultrix builds.
3805 - Fix a bug where a certain sort of incoming packet could cause a core
3806 dump on Solaris (and probably elsewhere).
3808 - Add some more safety checks in error logging code.
3810 - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
3812 - Fix relay agent so that if an interface is specified on the command
3813 line, the relay agent does not dump core.
3815 - Fix class matching so that match if can be combined with match or
3818 - Do not allow spurious leases in the lease database to introduce
3819 potentially bogus leases into the in-memory database.
3821 - Fix a byte-order problem in the client hardware address type code
3824 - Be slightly less picky about what sort of hardware addresses OMAPI
3825 can install in host declarations.
3827 Changes since 3.0 Beta 2 Patchlevel 4
3829 - Incorporated Peter Marschall's proposed change to array/record
3830 parsing, which allows things like the slp-agent option to be encoded
3831 correctly. Thanks very much to Peter for taking the initiative to
3832 do this, and for doing such a careful job of it (e.g., updating the
3835 - Added an encoding for the slp-agent option. :')
3837 - Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
3838 request for help on this with patches!
3840 - Incorporated a change that should fix a problem reported by Philippe
3841 Jumelle where when the network connection between two servers is
3842 lost, they never reconnect.
3844 - Fix client script files other than that for NetBSD to actually use
3845 make_resolv_conf as documented in the manual page.
3847 - Fix a bug in the packet handling code that could result in a core
3850 - Fix a bug in the bootp code where responses on the local net would
3851 be sent to the wrong MAC address. Thanks to Jerry Schave for
3854 Changes since 3.0 Beta 2 Patchlevel 3
3856 - In the DHCP client, execute client statements prior to using the values
3857 of options, so that the client configuration can overridden, e.g., the
3860 - Fix a reference counting error that would result in very reproducible
3861 failures in updates, as well as occasional core dumps, if a zone was
3862 declared without a key.
3864 - Fix some Linux 2.0 compilation problems.
3866 - Fix a bug in scope evaluation during execution of "on" statements that
3867 caused values not to be recorded on leases.
3869 - If the dhcp-max-message-size option is specified in scope, and the
3870 client didn't send this option, use the one specified in scope to
3871 determine the maximum size of the response.
3873 Changes since 3.0 Beta 2 Patchlevel 2
3875 - Fix a case where spawning subclasses were being allocated
3876 incorrectly, resulting in a core dump.
3878 - Fix a case where the DHCP server might inappropriately NAK a
3881 - Fix a place dhcprequest() where static leases could leak.
3883 - Include memory.h in omapip_p.h so that we don't get warnings about
3886 Changes since 3.0 Beta 2 Patchlevel 1
3888 - Notice when SIOCFIGCONF returns more data than fit in the buffer -
3889 allocate a larger buffer, and retry. Thanks to Greg Fausak for
3892 - In the server, if no interfaces were configured, report an error and
3895 - Don't ever record a state of 'startup'.
3897 - Don't try to evaluate the local failover binding address if none was
3898 specified. Thanks to Joseph Breu for finding this.
projects / thirdparty / dhcp.git / blob