1 Internet Systems Consortium DHCP Distribution
9 ISC DHCP 4.2.x includes features that were not included in DHCP 4.1.x.
12 Processing the DHCP to DNS server transactions in an asyncrhonous fashion.
13 The DHCP server or client can now continue with its processing while
14 awaiting replies from the DNS server.
16 There are a number of DHCPv6 limitations and features missing in this
17 release, which will be addressed in the future:
19 - Only Solaris, Linux, FreeBSD, NetBSD, and OpenBSD are supported.
21 - DHCPv6 includes human-readable text in status code messages, in
22 English. A method to reconfigure or support other languages would
25 - The "host-identifier" option is limited to a simple token.
27 - The client and server can only operate DHCPv4 or DHCPv6 at a time,
28 not both. To use both protocols simultaneously, two instances of the
29 relevant daemon are required, one with the '-6' command line option.
31 For information on how to install, configure and run this software, as
32 well as how to find documentation and report bugs, please consult the
35 ISC DHCP uses standard GNU configure for installation. Please review the
36 output of "./configure --help" to see what options are available.
38 The system has only been tested on Linux, FreeBSD, and Solaris, and may not
39 work on other platforms. Please report any problems and suggested fixes to
42 Changes since 4.2.0 (new features)
44 - If a client renews before 'dhcp-cache-threshold' percent of its lease
45 has elapsed (default 25%), the server will reuse the allocated lease
46 (provide a lease within the currently allocated lease-time) rather
47 than extend or renew the lease. This absolves the server of needing
48 to perform an fsync() operation on the lease database before reply,
49 which improves performance. [ISC-Bugs #22228]
50 Update this patch to support asynchronous DDNS. If the server is
51 attempting to do DDNS on a lease it should be udpated and written to
52 disk even if that wouldn't be necessary due to the thresholding
55 - The 'no available billing' log line now also logs the name of the last
56 matching billing class tried before failing to provide a billing.
59 - A problem with missing get_hw_addr function when --enable-use-sockets
60 was used is now solved on GNU/Linux, BSD and GNU/Hurd systems. Note
61 that use-sockets feature was not tested on those systems. Client and
62 server code no longer use MAX_PATH constant that is not defined on
63 GNU/Hurd systems. [ISC-Bugs #25979]
65 - Add a perl script in the contrib directory, dhcp-lease-list.pl, which
66 can parse v4 lease files and output the lease information in a more
67 human friendly manner. This was written by Christian Hammers with
68 some updates by vom and ISC. This is contributed code and is not
69 supported by ISC; however it may be useful to some users.
72 - Add support in v6 for on-commit, on-expire and on-release.
75 - Add support for using classes with v6.
78 - Update the DDNS code to current standards and allow for sharing
79 of DDNS entries between v4 and v6 clients. The new code is used
80 if the ddns-update-style is set to "standard", the older code is
81 still available if ddns-update-style is set to "interim". The
82 oldest DDNS code "ad-hoc" has been removed. Thanks to Thomas Pegeot
83 who submitted a patch for this issue. This patch is based on
84 that work with some modifications.
87 - Add a configuration option to the server to suppress using fsync().
88 Enabling this option will mean that fsync() is never called. This
89 may provide better performance but there is also a risk that a lease
90 will not be properly written to the disk after it has been issued
91 to a client and before the server stops. Using this option is
95 - Add some logging statements to indicate when the server is ready
96 to serve. One statement is emitted after the server has finished
97 reading its files and is about to enter the dispatch loop.
98 This is "Server starting service.".
99 The second is emitted when a server determines that both it and
100 its failover peer are in the normal state.
101 This is "failover peer <name>: Both servers normal."
104 - Add support for accessing options from v6 relays. The v6relay
105 statement allows the administrator to choose which relay to
106 use when searching for an option, see the dhcp-options man page
107 for a description. The host-identifer option has also been
108 updated to support the use of relay options see the dhcpd.conf
109 man page for a description.
112 - When doing DDNS if there isn't an appropriate zone statement attempt
113 to find a reasoanble nameserver via a DNS resolver. This restores
114 some functionality that was lost in the transition to asynchronous
115 DDNS. Due to the lack of security and increase in fragility of the
116 system when using this feature we strongly recommend the use of
117 appropriate zone statements rather than using this functionality.
120 - Add support for specifying the address from which to send
121 DDNS updates on the DHCP server. There are two new options
122 "ddns-local-address4" and "ddns-local-address6" that each take
123 one instance of their respective address types.
128 - Address static analysis warnings.
129 [ISC-Bugs #33510] [ISC-Bugs #33511]
131 - Silence benign static analysis warnings.
134 - Add check for 64-bit package for atf.
137 - Use newer auto* tool packages and turn on RFC_3542 support on Mac OS.
140 - Remove a variable when it isn't being used due to #ifdefs to avoid
141 a compiler warning on Solaris using GCC.
144 - Add a check for too much whitespace in a config or lease file.
145 Thanks to Paolo Pellegrino for finding the issue and a suggestion
149 - Fix several problems with using OMAPI to manipulate class and subclass
153 - Added a sleep call after killing the old client to allow time
154 for the sockets to be cleaned. This should allow the -r option
155 to work more consistently.
158 - Missing files for ISC DHCP Developer's Guide are now included in
159 the release tarballs. To generate this documentation, please use
160 make devel command in doc directory. [ISC-Bugs #32767]
162 - Update client script for use with openwrt.
165 - Fix the socket handling for DHCPv6 clients to allow multiple instances
166 of a client on a single machine to work properly. Previously only
167 one client would receive the packets. Thanks to Jiri Popelka at Red Hat
168 for the bug report and a potential patch.
171 - Added support for gentle shutdown after signal is received.
172 [ISC-Bugs #32692] [ISC-Bugs 34945]
174 - Enhance the DHCPv6 server logging to include the addresses that are assigned
180 - Correct code to calculate timing values in client to compare
181 rebind value to infinity instead of renew value.
182 Thanks to Chenda Huang from H3C Technologies Co., Limited
183 for reporting this issue.
186 - Fix some issues in the code for parsing and printing options.
187 [ISC-Bugs #22625] - properly print options that have several fields
188 followed by an array of something for example "fIa"
189 [ISC-Bugs #27289] - properly parse options in declarations that have
190 several fields followed by an array of something for example "fIa"
191 [ISC-Bugs #27296] - properly determine if we parsed a 16 or 32 bit
192 value in evaluate_numeric_expression (extract-int).
193 [ISC-Bugs #27314] - properly parse a zero length option from
194 a lease file. Thanks to Marius Tomaschewski from SUSE for the report
195 and prototype patch for this ticket as well as ticket 27289.
197 ! Previously the server code was relaxed to allow packets with zero
198 length client ids to be processed. Under some situations use of
199 zero length client ids can cause the server to go into an infinite
200 loop. As such ids are not valid according to RFC 2132 section 9.14
201 the server no longer accepts them. Client ids with a length of 1
202 are also invalid but the server still accepts them in order to
203 minimize disruption. The restriction will likely be tightened in
204 the future to disallow ids with a length of 1.
205 Thanks to Markus Hietava of Codenomicon CROSS project for the
206 finding this issue and CERT-FI for vulnerability coordination.
210 ! When attempting to convert a DUID from a client id option
211 into a hardware address handle unexpected client ids properly.
212 Thanks to Markus Hietava of Codenomicon CROSS project for the
213 finding this issue and CERT-FI for vulnerability coordination.
217 ! A pair of memory leaks were found and fixed. Thanks to
218 Glen Eustace of Massey University, New Zealand for finding
223 - Existing legacy unit-tests have been migrated to Automated Test
224 Framework (ATF). Several new tests have been developed. To enable
225 unit-tests, please use --with-atf in configure script. A Developer's
226 Guide has been added. To generate it, please use make devel in
227 the doc directory. It is currently in early stages of development,
228 but is expected to grow in the near future. [ISC-Bugs 25901]
230 ! An issue with the use of lease times was found and fixed. Making
231 certain changes to the end time of an IPv6 lease could cause the
232 server to abort. Thanks to Glen Eustace of Massey University,
233 New Zealand for finding this issue.
237 - Update the memory leakage debug code to work with v6.
240 - Relax the requirements for deleting an A or AAAA record.
241 Previously the DDNS removal code required both the A or AAAA
242 record and the TXT record to exist. This requirement could
243 cause problems if something interrupted the removal leaving
244 the TXT record alone. This relaxation was codified in RFC 4703.
247 - Modify the failover code to handle incorrect peer names
248 better. Previously the structure holding the name might
249 have been freed inappropriately in some cases and not
250 freed in other cases.
253 - Add a configure option, enable-secs-byteorder, to deal with
254 clients that do the byte ordering on the secs field incorrectly.
255 This field should be in network byte order but some clients
256 get it wrong. When this option is enabled the server will examine
257 the secs field and if it looks wrong (high byte non zero and low
258 byte zero) swap the bytes. The default is disabled. This option
259 is only useful when doing load balancing within failover.
262 - Fix a set of issues that were discovered via a code inspection
263 tool. Thanks to Jiri Popelka and Tomas Hozza Red Hat for the logs
267 - Parsing unquoted base64 strings improved. Parser now properly handles
268 strings that contain reserved names. [ISC-Bugs #23048]
270 - Modify the nak_lease function to make some attempts to find a
271 server-identifier option to use for the NAK.
274 - The client now passes information about the options it requested
275 from the server to the script code via environment variables.
276 These variables are of the form requested_<option_name>=1 with
277 the option name being the same as used in the new_* and old_*
281 - Add support for a simple check that the server id in a request message
282 to a failover peer matches the server id of the server. This support
283 is enabled by editing the file includes/site.h and uncommenting the
284 definition for SERVER_ID_CHECK. The option has several restrictions
285 and issues - please read the comment in the site.h file before
289 - Tidy up some compiler issues in the debug code.
292 - Move the dhcpd.conf exmample file to dhcpd.conf.example to avoid
293 overwriting the dhcpd.conf file when installing a new version of
294 ISC DHCP. The user will now need to manual copy and edit the
295 dhcpd.conf file as desired.
298 - Check the status value when trying to read from a connection to
299 see if it may have been closed. If it appears closed don't try
300 to read from it again. This avoids a potential busy-wait like
301 loop when the peer names are mismatched.
304 - Remove an unused variable to keep compilers happy.
307 - Modify test makefiles to be more similar to standard makefiles
308 and comment out a currently unused test.
313 ! Add a check for a null pointer before calling the regexec function.
314 Without this check we could, under some circumstances, pass
315 a null pointer to the regexec function causing it to segfault.
316 Thanks to a report from BlueCat Networks.
320 ! Modify the DDNS handling code. In a previous patch we added logging
321 code to the DDNS handling. This code included a bug that caused it
322 to attempt to dereference a NULL pointer and eventually segfault.
323 While reviewing the code as we addressed this problem, we determined
324 that some of the updates to the lease structures would not work as
325 planned since the structures being updated were in the process of
326 being freed: these updates were removed. In addition we removed an
327 incorrect call to the DDNS removal function that could cause a failure
328 during the removal of DDNS information from the DNS server.
329 Thanks to Jasper Jongmans for reporting this issue.
333 - Fixed the code that checks if an address the server is planning
334 to hand out is in a reserved range. This would appear as
335 the server being out of addresses in pools with particular ranges.
338 - In the DDNS code handle error conditions more gracefully and add more
339 logging code. The major change is to handle unexpected cancel events
340 from the DNS client code.
343 - Tidy up the receive calls and eliminate the need for found_pkt.
346 - Add support for Infiniband over sockets to the server and
347 relay code. We've tested this on Solaris and hope to expand
348 support for Infiniband in the future. This patch also corrects
349 some issues we found in the socket code.
352 - Add a compile time check for the presence of the noreturn attribute
353 and use it for log_fatal if it's available. This will help code
354 checking programs to eliminate false positives.
357 - Fixed many compilation problems ("set, but not used" warnings) for
358 gcc 4.6 that may affect Ubuntu 11.10 users. [ISC-Bugs #27588]
360 - Modify the code that determines if an outstanding DDNS request
361 should be cancelled. This patch results in cancelling the
362 outstanding request less often. It fixes the problem caused
363 by a client doing a release where the TXT and PTR records
364 weren't removed from the DNS.
367 - Use offsetof() instead of sizeof() to get the sizes for dhcpv6_relay_packet
368 and dhcpv6_packet in several more places. Thanks to a report from
369 Bruno Verstuyft and Vincent Demaertelaere of Excentis.
372 - Remove outdated note in the description of the bootp keyword about the
373 option not satisfying the requirement of failover peers for denying
374 dynamic bootp clients.
377 - Multiple items to clean up IPv6 address processing.
378 When processing an IA that we've seen check to see if the
379 addresses are usable (not in use by somebody else) before
381 When reading in leases from the file discard expired addresses.
382 When picking an address for a client include the IA ID in
383 addition to the client ID to generally pick different addresses
385 [ISC-Bugs #23138] [ISC-Bugs #27945] [ISC-Bugs #25586]
388 - Remove unnecessary checks in the lease query code and clean up
389 several compiler issues (some dereferences of NULL and treating
390 an int as a boolean).
393 - Fix the NA and PD allocation code to handle the case where a client
394 provides a preference and the server doesn't have any addresses or
395 prefixes available. Previously the server ignored the request with
396 this patch it replies with a NoAddrsAvail or NoPrefixAvail response.
397 By default the code performs according to the errata of August 2010
398 for RFC 3315 section 17.2.2; to enable the previous style see the
399 section on RFC3315_PRE_ERRATA_2010_08 in includes/site.h. This option
400 may be removed in the future.
401 Thanks to Jiri Popelka at Red Hat for the patch.
404 - Fix up some issues found by static analysis.
405 A potential memory leak and NULL dereference in omapi.
406 The use of a boolean test instead of a bitwise test in dst.
409 - Rotate the lease file when running in v6 mode.
410 Thanks to Christoph Moench-Tegeder at Astaro for the
411 report and the first version of the patch.
416 - Fix the code that checks for an existing DDNS transaction to cancel
417 when removing DDNS information, so that we will continue with the
418 processing if we have a lease even if it doesn't have an outstanding
419 transaction. [ISC-Bugs #24682]
421 - Add AM_MAINTAINER_MODE to configure.ac to avoid rebuilding
422 configuration files. [ISC-Bugs #24107]
424 - Add support for passing DDNS information to a DNS server over
425 an IPv6 address. [ISC-Bugs #22647]
427 - Enhanced patch for 23595 to handle IPv4 fixed addresses more
428 cleanly. [ISC-Bugs #23595]
432 ! In dhclient check the data for some string options for
433 reasonableness before passing it along to the script that
434 interfaces with the OS.
438 - DHCPv6 server now responds properly if client asks for a prefix that
439 is already assigned to a different client. [ISC-Bugs #23948]
441 - Add the option "--no-pid" to the client, relay and server code,
442 to disable writing a pid file. Add the option "-pf pidfile"
443 to the relay to allow the user to supply the pidfile name at
444 runtime. Add the "with-relay6-pid-file" option to configure
445 to allow the user to supply the pidfile name for the relay
446 in v6 mode at configure time.
447 [ISC-Bugs #23351] [ISC-Bugs #17541]
449 - 'dhclient' no longer waits a random interval after first starting up to
450 begin in the INIT state. This conforms to RFC 2131, but elects not to
451 implement a 'SHOULD' direction in section 4.1. The goal of this change
452 is to start up faster. [ISC-Bugs #19660]
454 - Added 'initial-delay' parameter that specifies maximum amount of time
455 before client goes to the INIT state. The default value is 0. In previous
456 versions of the code client could wait up to 5 seconds. The old behavior
457 may be restored by using 'initial-delay 5;' in the client config file.
460 - ICMP ping-check should now sit closer to precisely the number of seconds
461 configured (or default 1), due to making use of the new microsecond
462 scale timer internally to dhcpd. This corrects a bug where the server
463 may immediately timeout an ICMP ping-check if it was made late in the
464 current second. [ISC-Bugs #19660]
466 - The DHCP client will schedule renewal and rebinding events in
467 microseconds if the DHCP server provided a lease-time that would result
468 in sub-1-second timers. This corrects a bug where a 2-second or lower
469 lease-time would cause the DHCP client to enter an infinite loop by
470 scheduling renewal at zero seconds. [ISC-Bugs #19660]
472 - Client lease records are recorded at most once every 15 seconds. This
473 keeps the client from filling the lease database disk quickly on very small
474 lease times. [ISC-Bugs #19660]
476 - To defend against RFC 2131 non-compliant DHCP servers which fail to
477 advertise a lease-time (either mangled, or zero in value) the DHCP
478 client now adds the server to the reject list ACL and returns to INIT
479 state to hopefully find an RFC 2131 compliant server (or retry in INIT
480 forever). [ISC-Bugs #19660]
482 - Parameters configured to evaluate from user defined function calls can
483 now be correctly written to dhcpd.leases (as on 'on events' or dynamic
484 host records inserted via OMAPI). [ISC-Bugs #22266]
486 - If a 'next-server' parameter is configured in a dynamic host record via
487 OMAPI as a domain name, the syntax written to disk is now correctly parsed
488 upon restart. [ISC-Bugs #22266]
490 - The DHCP server now responds to DHCPLEASEQUERY messages from agents using
491 IP addresses not covered by a subnet in configuration. Whether or not to
492 respond to such an agent is still governed by the 'allow leasequery;'
493 configuration parameter, in the case of an agent not covered by a configured
494 subnet the root configuration area is examined. Server now also returns
495 vendor-class-id option, if client sent it. [ISC-Bugs #21094]
497 - Documentation fixes
498 [ISC-Bugs #17959] add text to AIX section describing how to have it send
499 responses to the all-ones address.
500 [ISC-Bugs #19615] update the includes in dhcpctl/dhcpctl.3 to be more correct
501 [ISC-Bugs #20676] update dhcpd.conf.5 to include the RFC numbers for DDNS
503 - Relay no longer crashes, when DHCP packet is received over interface without
504 any IPv4 address assigned. Also extended logging message about discarding
505 packets with invalid hlen with information about relevant interface name.
508 - Relay now properly logs that packet was received over interface without
509 global IPv6 address [ISC-Bugs #24070]
511 - Linux Packet Filter interface improvement. sockaddr_pkt structure is used,
512 rather than sockaddr. Packet ethertype is now forced to ETH_P_IP.
515 - Minor code cleanups - but note port change for #23196
516 [ISC-Bugs #23470] - Modify when an ignore return macro is defined to
517 handle unsed error return warnings for more versions of gcc.
518 [ISC-Bugs #23196] - Modify the reply handling in the server code to
519 send to a specified port rather than to the source port for the incoming
520 message. Sending to the source port was test code that should have
521 been removed. The previous functionality may be restored by defining
522 REPLY_TO_SOURCE_PORT in the includes/site.h file. We suggest you don't
523 enable this except for testing purposes.
524 [ISC-Bugs #22695] - Close a file descriptor in an error path.
525 [ISC-Bugs #19368] - Tidy up variable types in validate_port.
527 - Code cleanup: remove obsolete PROTO, KandR, INLINE and ANSI_DECL macros
530 - Compilation problem with gcc4.5 and omshell.c resolved. [ISC-Bugs #23831]
532 - Client Script fixes
533 [ISC-Bugs #23045] Typos in client/scripts/openbsd
534 [ISC-Bugs #23565] In the client scripts add a zone id (interface id) if
535 the domain search address is link local.
536 [ISC-Bugs #1277] In some of the client scripts add code to handle the
537 case of the default router information being changed without the address
540 - Documentation cleanup
541 [ISC-Bugs #23326] Updated References document, several man page updates
543 - Server no longer complains about NULL pointer when configured
544 server-identifier expression fails to evaluate. [ISC-Bugs #24547]
546 - Convert ISC_R_INPROGRESS status to ISC_R_SUCCESS when called from other
547 than the dispatch handler. This fixes an issue where omshell, when
548 run from the same platform as the server, would appear to fail to
549 connect. This is a companion to #21839. [ISC-Bugs #23592]
551 - Enlarge the buffer size used by the Omshell code and some of the
552 print routines to allow for greater than 60 characters or, when
553 printing as hex strings, 20 characters. [ISC-Bugs #22743]
555 - In Solaris 11 switch to using sockets instead of DLPI, thanks
556 to a patch form Oracle. [ISC-Bugs #24634].
558 - Strict checks for content of domain-name DHCPv4 option can now be
559 configured during compilation time. Even though RFC2132 does not allow
560 to store more than one domain in domain-name option, such behavior is
561 now enabled by default, but this may change some time in the future.
562 See ACCEPT_LIST_IN_DOMAIN_NAME define in includes/site.h.
565 - DNS Update fix. A misconfigured server could crash during DNS update
566 processing if the configuration included overlapping pools or
567 multiple fixed-address entries for a single address. This issue
568 affected both IPv4 and IPv6. The fix allows a server to detect such
569 conditions, provides the user with extra information and recommended
570 steps to fix the problem. If the user enables the appropriate option
571 in site.h then server will be terminated
574 ! Two packets were found that cause a server to halt. The code
575 has been updated to properly process or reject the packets as
576 appropriate. Thanks to David Zych at University of Illinois
577 for reporting this issue. [ISC-Bugs #24960]
578 One CVE number for each class of packet.
584 - Documentation cleanup covering multiple tickets
585 [ISC-Bugs #20265] [ISC-Bugs #20259] minor cleanup
586 [ISC-Bugs #20263] add text describing some default values
587 [ISC-Bugs #20193] single quotes at the start of a line indicate a control
588 line to nroff, escape them if we actually want a quote.
589 [ISC-Bugs #18916] sync the pointer to web pages amongst the different docs
591 - 'get-host-names true;' now also works even if 'use-host-decl-names true;'
592 was also configured. The nature of this repair also fixes another
593 error; the host-name supplied by a client is no longer overridden by a
594 reverse lookup of the lease address. Thanks to a patch from Wilco Baan
595 Hofman supplied to us by the Debian package maintenance team.
596 [ISC-Bugs #21691] {Debian Bug#509445}
598 - The .TH tag for the dhcp-options manpage was typo repaired
599 thanks to a report from jidanni and the Debian package maintenance
600 team. [ISC-Bugs #21676] {Debian Bug#563613}
602 - More documentation changes - primarily to put the options in the dhclient
603 and dhcpd man pages into the standard form. Thanks in part to a patch
604 from David Cantrell at Red Hat.
605 [ISC-Bugs #20264] and parts of [ISC-Bugs #17744] dhclient.8 changes
607 - Add code to clear the pointer to an object in an OMAPI handle when the
608 object is freed due to a dereference. [ISC-Bugs #21306]
610 - Fixed a bug that leaks host record references onto lease structures,
611 causing the server to apply configuration intended for one host to any
612 other innocent clients that come along later. [ISC-Bugs #22018]
615 [ISC-Bugs #19566] When trying to find the zone for a name for ddns allow
616 the name to be at the apex of the zone.
617 [ISC-Bugs #19617] Restrict length of interface name read from command line
618 in dhcpd - based on a patch from David Cantrell at Red Hat.
619 [ISC-Bugs #20039] Correct some error messages in dhcpd.c
620 [ISC-Bugs #20070] Better range check on values when creating a DHCID.
621 [ISC-Bugs #20198] Avoid writing past the end of the field when adding
622 overly long file or server names to a packet and add a log message
623 if the configuration supplied overly long names for these fields.
624 Thanks to Martin Pala.
625 [ISC-Bugs #21497] Add a little more randomness to rng seed in client
626 thanks to a patch from Jeremiah Jinno.
628 - Correct error handling in DLPI [ISC-Bugs #20378]
630 - Remove __sun__ and __hpux__ typedefs in osdep.h as they are now being
631 checked in configure. [ISC-Bugs #20443]
633 - Modify how the cmsg header is allocated the v6 send and received routines
634 to compile on more compilers. [ISC-Bugs #20524]
636 - When parsing a domain name free the memory for the name after we are
637 done with it. [ISC-Bugs #20824]
639 - Add an elapsed time option to the release message and refactor the
640 code to move most of the common code to a single routine.
643 - Two identical log messages for commit_leases() have been disambiguated.
646 - Parse date strings more properly - the code now handles semi-colons in
647 date strings correctly. Thanks to a patch from Jiri Popelka at Red Hat.
648 [ISC-Bugs #21501, #20598]
650 - Fixes to lease input and output.
651 [ISC-Bugs #20418] - Some systems don't support the "%s" argument to
652 strftime, paste together the same string using mktime instead.
653 [ISC-Bugs #19596] - When parsing iaid values accept printable
655 [ISC-Bugs #21585] - Always print time values in omshell as hex
656 instead of ascii if the values happen to be printable characters.
658 - Minor changes for scripts, configure.ac and Makefiles
659 [ISC-Bugs #19147] Use domain-search instead of domain-name in manual and
660 example conf file. Thanks to a patch from David Cantrell
662 [ISC-Bugs #19761] Restore address when doing a rebind in DHCPv6
663 [ISC-Bugs #19945] Properly close the quote on some arguments.
664 [ISC-Bugs #20952] Add 64 bit types to configure.ac
665 [ISC-Bugs #21308] Add "PATH=" to CLIENT_PATH envrionment variable
667 - Update the code to parse dhcpv6 lease files to accept a semi-colon at
668 the end of the max-life and preferred-life clauses. In order to be
669 backwards compatible with older lease files not finding a semi-colon
670 is also accepted. [ISC-Bugs #22303].
672 ! Handle a relay forward message with an unspecified address in the
673 link address field. Previously such a message would cause the
674 server to crash. Thanks to a report from John Gibbons. [ISC-Bugs #21992]
675 CERT: VU#102047 CVE: CVE-2010-3611
677 - ./configure on longer searches for -lcrypto to explicitly link against.
678 This fixes a bug where 'dhclient' would have shared library dependencies
679 on '/usr/lib'. [ISC-Bugs #21967]
681 - Handle pipe failures more gracefully. Some OSes pass a SIGPIPE
682 signal to a process and will kill the process if the signal isn't
683 caught. This patch adds code to turn off the SIGPIPE signal via
684 a setsockopt() call. The signal is already being ignored as part
685 of the ISC library. [ISC-Bugs #22269]
687 - Restore printing of values in omshell to the style pre 21585. For
688 21585 we changed the print routines to always display time values
689 as a hex list. This had a side effect of printing all data strings
690 as a hex list. We shall investigate other ways of displaying time
691 values more usefully. [ISC-Bugs #22626]
693 ! Fix the handling of connection requests on the failover port.
694 Previously a connection request from a source that wasn't
695 listed as a failover peer would cause the server to become
696 non-responsive. Thanks to a report from Brad Bendily, brad@bendily.com.
698 CERT: VU#159528 CVE: CVE-2010-3616
700 - Don't pass the ISC_R_INPROGRESS status to the omapi signal handlers.
701 Passing it through to the handlers caused the omshell program to fail
702 to connect to the server. [ISC-Bugs #21839]
704 - Fix the paranthesis in the code to process configuration statements
705 beginning with "auth". The previous arrangement caused
706 "auto-partner-down" to be processed incorrectly. [ISC-Bugs #21854]
708 - Limit the timeout period allowed in the dispatch code to 2^^32-1 seconds.
709 Thanks to a report from Jiri Popelka at Red Hat.
710 [ISC-Bugs #22033], [Red Hat Bug #628258]
712 - When processing the format flags for a given option consume the
713 flag indicating an optional value correctly. A symptom of this
714 bug was an infinite loop when trying to parse the slp-service-scope
715 option. Thanks to a patch from Marius Tomaschewski.
718 - Disable the use of kqueue in the ISC library. This avoids a problem
719 between the fork and socket code that caused the dhcpd process to
720 use all available cpu if the program daemonized itself.
723 ! When processing a request in the DHCPv6 server code that specifies
724 an address that is tagged as abandoned (meaning we received a
725 decline request for it previously) don't attempt to move it from
726 the inactive to active pool as doing so can result in the server
727 crashing on an assert failure. Also retag the lease as active
728 and reset its timeout value.
731 - Removed the restriction on using IPv6 addresses in IPv4 mode. This
732 allows IPv4 options which contain IPv6 addresses to be specified. For
733 example the 6rd option can be specified and used like this:
736 option 6rd code 212 = { integer 8, integer 8,
737 ip6-address, array of ip-address };
738 option 6rd 16 10 2001:: 1.2.3.4, 5.6.7.8;
740 - Handle some DDNS corner cases better. Maintain the DDNS transaction
741 information when updating a lease and cancel any existing transactions
742 when removing the ddns information.
745 - Some fixes for LDAP
746 [ISC-Bugs #21783] - Include lber library when building ldap
747 [ISC-Bugs #22888] - Enable the ldap code when buidling common
748 The above fixes are from Jiri Popelka at Red Hat.
750 - Modify the dlpi code to accept getmsg() returning a positive value.
753 Changes since 4.2.0b2
755 - Add declaration for variable in debug code in alloc.c. [ISC-Bugs #21472]
757 Changes since 4.2.0b1
759 - Prohibit including lease time information in a response to a DHCP INFORM.
762 ! Accept a client id of length 0 while hashing. Previously the server would
763 exit if it attempted to hash a zero length client id, providing attackers
764 with a simple denial of service attack. [ISC-Bugs #21253]
765 CERT: VU#541921 - CVE: CVE-2010-2156
767 - A memory leak in ddns processing was closed. [ISC-Bugs #21377]
769 - Modify the exception handling for initial context creation. Previously
770 we would try and clean up before exiting. This could present problems
771 when the cleanup required part of the context that wasn't available. It
772 also didn't do much as we exited afterwards anyway. Now we simply log
773 the error and exit. [ISC-Bugs #21093]
775 - A bug was fixed that could cause the DHCPv6 server to advertise/assign a
776 previously allocated (active) lease to a client that has changed subnets,
777 despite being on different shared networks. Dynamic prefixes specifically
778 allocated in shared networks also now are not offered if the client has
779 moved. [ISC-Bugs #21152]
781 - Add some debugging output for use with the DDNS code. [ISC-Bugs #20916]
783 - Fix the trace code to handle timing events better and to truncate a file
784 before using instead of overwriting it. [ISC-Bugs #20969]
786 - Modify the determination of the default TTL to use for DDNS updates.
787 The user may still configure the ttl via ddns-ttl. The default for
788 both v4 and v6 is now 1/2 the (preferred) lease time with a limit. The
789 previous defaults (1/2 lease time without a limit for v4 and a default
790 value for v6) may be used by defining USE_OLD_DDNS_TTL in site.h
793 - libisc/libdns is now brought up to version 9.7.1rc1. This corrects
794 three reported flaws in ISC DHCP;
796 o DHCP processes (dhcpd, dhclient) fail to start if one of either the
797 IPv4 or IPv6 address families is not present. [ISC-Bugs #21122]
799 o Assertion failure when attempting to cancel a previously running DDNS
800 update. [ISC-Bugs #21133]
802 o Compilation failure of libisc/libdns due to the use of a flexible
803 array member. [ISC-Bugs #21316]
805 Changes since 4.2.0a2
807 - Update the fsync code to work with the changes to the DDNS code. It now
808 uses a timer instead of noticing if there are no more packets to process.
810 - When constructing the DNS name structure from a text string append
811 the root to relative names. This satisfies a requirement in the DNS
812 library that names be absolute instead of relative and prevents DHCP
813 from crashing. [ISC-Bugs #21054]
815 - "The LDAP Patch" that has been circulating for some time, written by
816 Brian Masney and S.Kalyanasundraram and maintained for application to
817 the DHCP-4 sources by David Cantrell has been included. Please be
818 advised that these sources were contributed, and do not yet meet the
819 high standards we place on production sources we include by default.
820 As a result, the LDAP features are only included by using a compile-time
821 option which defaults off, and if you enable it you do so under your
822 own recognizance. We will be improving this software over time.
825 Changes since 4.2.0a1
827 - When using 'ignore client-updates;', the FQDN returned to the client
828 is no longer truncated to one octet.
830 - Cleaned up an unused hardware address variable in nak_lease().
832 - Manpage entries for the ia-pd and ia-prefix options were updated to
833 reflect support for prefix delegation.
835 - Cleaned up some compiler warnings
837 - An optimization described in the failover protocol draft is now included,
838 which permits a DHCP server operating in communications-interrupted state
839 to 'rewind' a lease to the state most recently transmitted to its peer,
840 greatly increasing a server's endurance in communications-interrupted.
841 This is supported using a new 'rewind state' record on the dhcpd.leases
842 entry for each lease.
844 - Fix the trace code which was broken by the changes to the DDNS code.
846 Changes since 4.1.0 (new features)
848 - Failover port configuration can now be left to defaults (port 647) as
849 described in the -12 revision of the Failover draft (and assigned by
850 IANA). Thanks in part to a patch from David Cantrell at Red Hat.
852 - If configured, dhclient may now transmit to an anycast MAC address,
853 rather than using a broadcast address. Thanks to a patch from David
856 - Added client support for setting interface MTU and metric, thanks to
857 Roy "UberLord" Marples <roy@marples.name>.
859 - Added client -D option to specify DUID type to send.
861 - A new failover configuration parameter has been introduced for those
862 environments where DHCP servers can be reasonably guaranteed to be
863 "down" when the failover TCP socket is severed, "auto-partner-down".
864 This parameter is not generally safe, and by default is disabled, so
865 please carefully review the documentation of this parameter in the
866 dhcpd.conf(5) manpage before determining to use it yourself.
868 - Added a configuration function, 'gethostname()', which calls the system
869 function of the same name and presents the results as a data expression.
870 This function can be used to incorporate the system level hostname of
871 the system the DHCP software is operating on in responses or queries (such
872 as including a failover partner's hostname in a dhcp message or binding
873 scope, or having a DHCP client send any system hostname in the host-name or
874 FQDN options by default).
876 - The dhcp-renewal-time and dhcp-rebinding-time options may now be configured
877 for DHCPv4 operation and used independently of the dhcp-lease-time
878 calculations. Invalid renew and rebinding times (e.g., greater than the
879 determined lease time) are omitted.
881 - Processing the DHCP to DNS server transactions in an asyncrhonous fashion.
882 The DHCP server or client can now continue with its processing while
883 awaiting replies from the DNS server.
885 - The 'hardware [ethernet|etc] ...;' parameter in host records has been
886 extended to attempt to match DHCPv6 clients by the last octets of a
887 DUID-LL or DUID-LLT provided by the client.
889 Changes since 4.1.0 (bug fixes)
891 - Remove infinite loop in token_print_indent_concat().
893 - Validate the argument to the -p option.
895 - The notorious 'option <unknown> ... larger than buffer' log line,
896 which is seen in some malformed DHCP client packets, was modified.
897 It now logs the universe name, and does not log the length values
898 (which are bogus corruption read from the packet anyway). It also
899 carries a hopefully more useful explanation.
901 - Suppress spurious warnings from configure about --datarootdir
903 - A bug was fixed that caused the server not to answer some valid Solicit
904 and Request packets, if the dynamic range covering any requested addresses
905 had been deleted from configuration.
907 - Update the code to deal with GCC 4.3. This included two sets of changes.
908 The first is to the configuration files to include the use of
909 AC_USE_SYSTEM_EXTENSIONS. The second is to deal with return values that
912 - The db-time-format option was documented in manpages.
914 - Using reserved leases no longer results in 'lease with binding state
915 free not on its queue' error messages, thanks to a patch from Frode
918 - Fix a build error in dhcrelay, using older versions of gcc with
921 - Two uninitialized stack structures are now memset to zero, thanks to a
922 patch from David Cantrell at Red Hat.
924 - Fixed a cosmetic bug where pretty-printing valid domain-search options would
925 result in an erroneous error log message ('garbage in format string').
927 - A bug in DLPI packet transmission (Solaris, HP/UX) that caused the server
928 to stop receiving packets is fixed. The same fix also means that the MAC
929 address will no longer appear 'bogus' on DLPI-based systems.
931 - A bug in select handling was discovered where the results of one select()
932 call were discarded, causing the server to process the next select() call
933 and use more system calls than required. This has been repaired - the
934 sockets will be handled after the first return from select(), resulting in
937 - The update-conflict-detection feature would leave an FQDN updated without
938 a DHCID (still currently implemented as a TXT RR). This would cause later
939 expiration or release events to fail to remove the domain name. The feature
940 now also inserts the client's up to date DHCID record, so records may safely
941 be removed at expiration or release time. Thanks to a patch submitted by
944 - Memory leak in the load_balance_mine() function is fixed. This would
945 leak ~20-30 octets per DHCPDISCOVER packet while failover was in use
948 - Various compilation fixes have been included for the memory related
949 DEBUG #defines in includes/site.h.
951 - Fixed Linux client script 'unary operator expected' errors with DHCPv6.
953 - Fixed setting hostname in Linux hosts that require hostname argument
954 to be double-quoted. Also allow server-provided hostname to
955 override hostnames 'localhost' and '(none)'.
957 - Fixed failover reconnection retry code to continue to retry to reconnect
958 rather than restarting the listener.
960 - Compilation on Solaris with USE_SOCKETS defined in includes/site.h has
961 been repaired. Other USE_ overrides should work better.
963 - A check for the local flavor of IFNAMSIZ had a broken 'else' condition,
964 that probably still resulted in the correct behaviour (but wouldn't use
965 a larger defined value provided by the host OS).
967 - Fixed a bug where an OMAPI socket disconnection message would not result
968 in scheduling a failover reconnection, if the link had not negotiated a
969 failover connect yet (e.g.: connection refused, asynch socket connect()
972 - A bug was fixed that caused the 'conflict-done' state to fail to be parsed
973 in failover state records.
975 ! A stack overflow vulnerability was fixed in dhclient that could allow
976 remote attackers to execute arbitrary commands as root on the system,
977 or simply terminate the client, by providing an over-long subnet-mask
978 option. CERT VU#410676 - CVE-2009-0692
980 - Fixed a bug where relay agent options would never be returned when
981 processing a DHCPINFORM.
983 - Versions 3.0.x syntax with multiple name->code option definitions is now
984 supported. Note that, similarly to 3.0.x, for by-code lookups only the
985 last option definition is used.
987 - Fixed a bug where a time difference of greater than 60 seconds between a
988 failover pair could cause the primary to crash on contact with the
989 secondary. Thanks to a patch from Steinar Haug.
991 - Don't look for IPv6 interfaces on Linux when running in DHCPv4 mode.
992 Thanks to patches from Matthew Newton and David Cantrell.
994 - Secondary servers in a failover pair will now perform ddns removals if
995 they had performed ddns updates on a lease that is expiring, or was
996 released through the primary. As part of the same fix, stale binding scopes
997 will now be removed if a change in identity of a lease's active client is
998 detected, rather than simply if a lease is noticed to have expired (which it
999 may have expired without a failover server noticing in some situations).
1001 - A patch supplied by David Cantrell at RedHat was applied that detects
1002 invalid calling parameters given to the ns_name_ntop() function.
1003 Specifically, it detects if the caller passed a pointer and size pair
1004 that causes the pointer to integer-wrap past zero.
1006 ! Fixed a fenceposting bug when a client had two host records configured,
1007 one using 'uid' and the other using 'hardware ethernet'. CVE-2009-1892
1009 - Fixed the check in the dhcp_interface_signal_handler routine to verify
1010 the existence of the linked signal handler before calling it.
1012 - Both host and subnet6 configuration groups are now included whether a
1013 fixed-address6 (DHCPv6) is in use or not. Host scoped configuration takes
1014 precedence. This fixes two bugs, one where host scoped configuration
1015 would not be included from a non-fixed-address6 host record, and the equal
1016 and opposite bug where subnet6 scoped configuration would not be used when
1017 over-riding values were not present in a matching fixed-address6 host
1020 - ./configure now checks to ensure the intX_t and u_intX_t types are defined,
1021 correcting a compilation failure when using Sun's compiler.
1023 - Modified the handling of a connection to avoid releasing the omapi io
1024 object for the connection while it is still in use. One symptom from
1025 this error was a segfault when a failover secondary attempted to connect
1026 to the failover primary if their clocks were not synchronized.
1028 - Clean up to allow compilation with gcc 2.95.4 on FreeBSD. Remove an
1029 extra semi-colon from common/dns.c and moved setting a variable to NULL
1030 in server/dhcpv6.c to allow the compiler to decide that the variable
1031 was always properly set.
1033 Changes since 4.1.0b1
1035 - A missing "else" in dhcrelay.c could have caused an interface not to
1038 Changes since 4.1.0a2
1040 - A cosmetic bug in DHCPDECLINE processing was fixed which caused all
1041 successful DHCPDECLINEs to be logged as "not found" rather than
1044 - Added configuration file examples for DHCPv6.
1046 - Some failover debugging #defines have been better defined and some
1047 high frequency messages moved to a deeper debugging symbol.
1049 - The CLTT parameter in failover is now only updated by client activity,
1050 and not by failover binding updates (taking on the peer's CLTT).
1052 - Failover BNDUPD messages are now discarded if they conflict with an
1053 update that has been transmitted, but not acknowledged.
1055 - A bug cleaning up unknown-xxx temporary option definitions was fixed.
1057 - Delayed-ack is now a compile-time option, compiled out by default.
1058 This feature is simply too experimental for right now, and causes
1059 some problems to some failover installations. We will revisit this
1062 - The !inet_pton() call in res_mkupdrec was adjusted to '<= 0' as
1063 inet_pton returns either 1, 0, or -1.
1065 - A dhclient-script for MacOS X has been included, which enables
1066 'dhclient -6' support.
1068 - DDNS removal routines were updated so that the DHCID is not removed until
1069 the client has been deprived of all A and AAAA records (not only the last
1070 one of either of those). This resolves a bug where dual stack clients
1071 would not be able to regain their names after either expiration event.
1073 Changes since 4.1.0a1
1075 - Corrected list of failover state values in dhcpd man page.
1077 - Fixed a bug that caused some request types to be logged incorrectly.
1079 - Clients that sent a parameter request list containing the
1080 routers option before the subnet mask option were receiving
1081 only the latter. Fixed.
1083 - The server wasn't always sending the FQDN option when it should.
1085 - A partner-down failover server no longer emits 'peer holds all free leases'
1086 if it is able to newly-allocate one of the peer's leases.
1088 - Fixed a coredump when adding a class via OMAPI.
1090 - Check whether files are zero length before trying to parse them.
1092 - Ari Edelkind's PARANOIA patch has been included and may be compiled in
1093 via two ./configure parameters, --enable-paranoia and
1094 --enable-early-chroot.
1096 - ./configure was extended to cover many optional build features, such
1097 as failover, server tracing, debugging, and the execute() command.
1099 - There is now a default 1/4 of a second scheduled delay between delayed
1100 fsync()'s, it can be configured by the max-ack-delay configuration
1103 - A bug was fixed where the length of a hostname was miscalculated, so that
1104 hosts were given odd-looking domain names ("foo.bar.ba.example.com").
1106 - Shared network selection should be done from the innermost relay
1107 valid link-address field, rather than the outermost.
1109 - Prefix pools are attached to shared network scopes.
1111 - Merged IA_XX related structures.
1113 - Add DHCPv6 files in configure.
1115 - A memory leak when using omapi has been fixed.
1117 - DHCPv6 vendor-class options (VSIO) are now only sent when they appear
1118 on the DHCPv6 ORO. This resolves a bug where VSIO options were placed
1119 in IA_NA encapsulated options fields.
1121 - Integrated client with stateless, temporary address and prefix delegation
1124 - A double-dereference in dhclient transmission of DHCPDECLINEs was
1127 - Fix handling of format code 'Z'.
1129 - Support "-1" argument in DHCPv6.
1131 - Merge DHCPv6-only "dhcrelay6" into general-purpose "dhcrelay" (use
1132 "-6" option to select DHCPv6 mode).
1134 - Fix handling of -A and -a flags in dhcrelay; it was failing to expand
1135 packet size as needed to add relay agent options.
1137 - A bug in subnet6 parsing where options contained in subnet6 clauses would
1138 not be applied to clients addressed within that network was repaired.
1140 - When configuring a "subnet {}" or "subnet6 {}" without an explicit
1141 shared-network enclosing it, the DHCP software would synthesize a
1142 shared-network to contain the subnet. However, all configuration
1143 parameters within the subnet more intuitively belong "to any client
1144 on that interface", or rather the synthesized shared-network. So,
1145 when a shared-network is synthesized, it is used to contain the
1146 configuration present inside the subnet {} clause. This means that
1147 the configuration will be valid for all clients on that network, not
1148 just those addressed out of the stated subnet. If you intended the
1149 opposite, the workaround is to explicitly configure an empty
1152 - A bug was fixed where Information-Request processing was not sourcing
1153 configured option values.
1155 - A warning was added since the DHCPv6 processing software does not yet
1156 support class statements.
1158 - Compliation warnings on GCC 4.3 relating to bootp source address
1159 selection were repaired.
1161 - The v6 BSD socket method was updated to use a single UDP BSD socket
1162 no matter how many interfaces are involved, differentiating the
1163 interfaces the packets were received on by the interface index supplied
1166 - The relay agent no longer listens to the All DHCP Servers Multicast
1169 - A bug was fixed in data_string_sprintfa() where va_start was only called
1170 once for two invocations of vsprintf() variants.
1172 - ERO (RFC 4994) server support.
1174 - Basic and partial DHCPv6 leasequery support.
1176 - Reliable DHCPv6 release (previous behavior, send release and exit, is
1177 still available with dhclient -6 -1 -r).
1179 Changes since 4.0.0 (new features)
1181 - Added DHCPv6 rapid commit support.
1183 - Added explicit parser support for zero-length DHCP options, such as
1184 rapid-commit, via format code 'Z'.
1186 - It's now possible to update the "ends" field of a lease with OMAPI.
1187 This is useful if you want not only to release a lease, but also make
1188 it available for reuse right away. Hat tip to Christof Chen.
1190 - Fixed definition of the iaaddr hash functions to use the correct
1191 functions when referencing and dereferencing memory.
1193 - Some definitions not in phase with the IANA registry were updated.
1195 - Allocated interface IDs are better controlled ('u' bit set to zero,
1196 reserved IDs avoided).
1198 - Unicast options are taken into account only for RENEWs.
1200 - NoAddrsAvail answers to SOLICITs are always ADVERTISEs even when a SOLICIT
1201 carries a rapid-commit option.
1203 - Return in place of raise an impossible condition when one tries to release
1204 an empty active lease.
1206 - Timer granularity is now 1/100s in the DHCPv6 client.
1208 - The dhclient-script was updated to create a host route for the default
1209 gateway if the supplied subnet mask for an IPv4 address was a /32. This
1210 allows the client to work in 'captive' network environments, where the
1211 operator does not want clients to crosstalk directly.
1213 - MINUS tokens should be parseable again.
1215 - Multiple (up to "delayed-ack x;" maximum) DHCPv4 packets are now queued and
1216 released in bursts after single fsync() events when the upper limit is
1217 reached or if the receiving sockets go dry. The practical upshot is
1218 that fsync-coupled server performance is now multiplicitively increased.
1219 The default delayed ack limit is 28. Thanks entirely to a patch from
1222 Changes since 4.0.0 (bug fixes)
1224 - DHCP now builds on AIX.
1226 - Exit with warning when DHCPv6-specific statements are used in the
1227 config file but -6 is not specified.
1229 - Fixed "--version" flag in dhcrelay
1231 - The 'min-secs' configuration parameter's log message has been updated to
1234 - The warning logged when an address range doesn't fit in the subnets
1235 they were declared has been updated to be more helpful and identify the
1236 typo in configuration that created the spanning addresses.
1238 - A bug in failover pool rebalancing that caused POOLREQ message ping-pongs
1241 - A flaw in failover pool rebalancing that could cause POOLREQ messages to
1242 be sent outside of the min-balance/max-balance scheduled intervals has
1245 - A cosmetic bug during potential-conflict recovery that caused the peer's
1246 'conflict-done' state message to be logged as 'unknown-state' has been
1247 repaired. It is now logged correctly.
1249 - A bug was fixed where the 'giaddr' may be used to find the client's subnet
1250 rather than its own 'ciaddr'.
1252 - A log message was introduced to clarify the situation where a failover
1253 'address' parameter (the server's local address) did not resolve to an
1256 - The minimum site code value was set to 224 in 3.1.0 to track RFC3942. This
1257 broke a lot of legacy site local configurations. The new code in place will
1258 track site local space minimum option codes and logs a warning to encourage
1259 updates and exploration of site local code migration problems. Option
1260 codes less than 128 in site local spaces remain inaccessible.
1262 - A possible relay agent option bug was repaired where random server
1263 initialization state may have been used to signal the relay agent
1264 information options sub-option code for the 'END' of the option space.
1266 - Fixes to allow code to compile and run on Solaris 9.
1268 - Fixes to allow code to compile on Mac OS X Leopard (10.5).
1270 - When server is configured with options that it overrides, a warning is
1271 issued when the configuration file is read, rather than at the time the
1272 option is overridden. This was important, because the warning was given
1273 every time the option was overridden, which could create a lot of
1274 unnecessary logging.
1276 - Fixed a compilation problems on platforms that define a value for FDDI,
1277 which conflicts with a dhcp configuration syntax token by the same name.
1279 - When a failover server suspects it has encountered a peer running a
1280 version 3.0.x failover server, a warning that the failover wire protocol
1281 is incompatible is printed.
1283 - The failover server no longer issues a floating point error if it encounters
1284 a previously undefined option code.
1286 - Fix startup error messages to report a missing "subnet6 declaration", rather
1287 than a missing "subnet declaration", when running as a DHCPv6 server.
1289 - DHCPv6 client timestamp in DUID was based on the year 1970 rather
1292 - Warn when attempting to use a hardware parameter in DHCPv6.
1294 - DHCPv6 released resources are now marked as released by the client.
1296 - 'Soft' bindings have no more side-effects.
1298 Changes since 4.0.0b3
1300 - The reverse dns name for PTR updates on IPv6 addresses has been fixed to
1301 use ip6.arpa. rather than default to in-addr.arpa and require user
1304 - dhc6_lease_destroy() and dhc6_ia_destroy() now set lease and IA pointers
1305 to NULL after freeing, to prevent subsequent accesses to freed memory.
1307 - The DHCPv6 server would not send the preference option unless the
1308 client requested it, via the ORO. This has been fixed, so the DHCPv6
1309 server will always send the preference value if it is configured.
1311 - When addresses were passed as hints to the server in an IA, they were
1312 incorrectly handled, sometimes being treated as an error. Now the
1313 server will treat these as hints and ignore them if it cannot supply
1314 a requested address.
1316 - If the client had multiple addresses, and one expired (was not renewed
1317 by the server), the client would continue to attempt to renew the same
1318 old address over and over. Now, the client will omit any expired
1319 addresses from future Confirm, Renew, or Rebind messages.
1321 - dhclient -6 will now select renew/rebind timers based upon the longest
1322 address expiration time rather than the shortest expiration time, in
1323 order to avoid cascading renewals in the event a server elects not to
1324 extend one of multiple IAADDR leases.
1326 - The server now limits clients that request multiple addresses to one
1327 address per IA by default, which can be adjusted through the
1328 "limit-addrs-per-ia" configuration option.
1330 - The DHCPv6 client now issues fresh transaction IDs on Renew and Rebind
1331 message exchanges, rather than using the most recent ID.
1333 - The DHCPv6 server now replies to Information-Request messages.
1335 - A bug was fixed in the dhclient-script for BSDs to correctly carry error
1336 codes through some conditions.
1338 - The parsing of some options in the dhclient lease file, in particular
1339 the success DHCPv6 status-code, was fixed.
1341 - A bug was fixed that caused the DHCPv6 ORO option to be corrupted with
1342 seemingly random values.
1344 - A reference overleak in DHCPv6 shared network processing was repaired.
1346 - ./configure now autodetects local database locations rather than trying
1347 to put dhcpd.leases and dhclient.leases in /usr/local/var/db, which no
1350 - Regression fix for bug where server advertised a IPv6 address in
1351 response to a SOLICIT but would not return the address in response
1354 - A bug was fixed where the DHCPv6 server puts the NoAddrsAvail status
1355 code in the IA_NA was fixed. The status code now appears in the root
1358 Changes since 4.0.0b2
1360 - Clarified error message when lease limit exceeded
1362 - Relative time may now be used as a qualifier for 'allow' and 'deny' access
1363 control lists. These directives may be used to assist in re-addressing
1364 address pools without having to constantly reconfigure the server. Please
1365 see 'man dhcpd.conf' for more information on allow/deny 'after time' syntax.
1366 Thanks to a patch from Christof Chen.
1368 - The server will now include multiple IA_NA's and multiple IAADDRs within
1369 them, if advertised by the client. It still only seeks to allocate one
1372 Changes since 4.0.0b1
1374 - Use different paths for PID and lease files when running in DHCPv4
1375 or DHCPv6 mode, so that servers for both protcols can be run
1376 simultaneously on a single interface.
1378 - Fixed a buffer overflow error which could have allowed a denial
1379 of service under unusual server configurations
1381 - Eliminated a spurious error message from the client
1383 - A number of bugs with the internal handling of lease state on the
1384 server have been fixed. Some of these could cause server crashes.
1386 - The peer_wants_leases() changes pulled up from 3.1.0 were corrected,
1387 'never used' leases will no longer consistently shift between servers
1388 on every pool rebalance run.
1390 - sendmsg()/recvmsg() control buffers are now declared in such a way to
1391 ensure they are correctly aligned on all (esp. 64-bit) architectures.
1393 - The client leasing subsystem was streamlined and corrected to account
1394 more closely for changes in client link attachment selection.
1396 Changes since 4.0.0a3
1398 - The DHCP server no longer requires a "ddns-update-style" statement,
1399 and now defaults to "none", which means DNS updates are disabled.
1401 - Log messages when failover peer names mismatch have been improved to
1402 point out the problem.
1404 - Bug where server advertised a IPv6 address in response to a SOLICIT
1405 but would not return the address in response to a REQUEST. Thanks to
1406 Dennis Kou for finding the bug.
1408 - Fixed an error causing the server to lock up on lease expiration,
1409 reported independently by Jothilingam Vasu and Dennis Kou.
1411 - Fixed a ./configure bug where compile tests were failing due to
1412 "-Werror" (unused variable) rather than the actual test failure. Lead
1413 to inconsistent and unworkable auto-configurations.
1415 - Compilation with DLPI and -Werror has been repaired.
1417 - Error in decoding IA_NA option if multiple interfaces are present
1418 fixed by Marcus Goller.
1420 - DHCPv6 server Confirm message processing has been enhanced - it no
1421 longer replies only to clients with host {} records, it now replies
1422 as directed in RFC3315 section 18.2.2 - that is, to all clients
1423 regardless of the existence of bindings.
1425 - A core dump during expired lease cleanup has been repaired.
1427 - DDNS updates state information are now stored in 'binding scopes' that
1428 follow the leases through their lifecycles. This enables DDNS teardowns
1429 on leases that are assigned and expired inbetween a server restart (the
1430 state is recovered from dhcpd.leases). Arbitrary user-specified binding
1431 scopes ('set var = "value";') are not yet supported.
1433 - Additional compilation problems on HP/UX have been repaired.
1435 Changes since 4.0.0a2
1437 - Fix for startup where there are no IPv4 addresses on an interface.
1438 Thanks to Marcus Goller for reporting the bug.
1440 - Fixed file descriptor leak on listen failure. Thanks to Tom Clark.
1442 - Bug in server configuration parser caused server to get stuck on
1443 startup for certain bad pool declarations. Thanks to Guillaume
1444 Knispel for the bug report and fix.
1446 - Code cleaned to remove warnings reported by "gcc -Wall".
1448 - DHCPv6 is now the default. You can disable DHCPv6 support using the
1449 "--disable-dhcpv6" flag when you run the configure script.
1451 - An internal database inconsistency bug was repaired where the server
1452 would segfault if a client attempted to renew a lease that had been
1453 loaded from persistent storage.
1455 - 'request' and 'also request' syntaxes have been added to accommodate
1456 the DHCPv6 client configuration. 'send dhcp6.oro' is no longer
1459 - Bug fixed where configuration file parsing did not work with
1460 zero-length options; this made it impossible to set the
1461 rapid-commit option.
1463 - Bogus messages about host records with IPv4 fixed-addresses being of
1464 non-128-bits in length were removed.
1466 Changes since 4.0.0a1
1468 - Bug in octal parsing fixed. Thanks to Bernd Fuhrmann for the report
1471 - Autoconf now supplies proper flags for Solaris DHCPv6 builds.
1473 - Fix for parsing error on some IPv6 addresses.
1475 - Invalid CIDR representation for IPv6 subnets or ranges now checked
1476 for when loading configuration.
1478 - Compilation on HP/UX has been repaired. The changes should generally
1479 apply to any architecture that supplies SIOCGLIFCONF but does not
1480 use 'struct lifconf' structures to pass values.
1482 - Two new operators, ~= and ~~, have been integrated to implement
1483 boolean matches by regular expression (such as may be used in
1484 class matching statements). Thanks to a patch by Alexandr S.
1485 Agranovsky, which underwent slight modification.
1487 - Fix for icmp packets on 64-bit systems (bug introduced in 4.0).
1489 - A bug was fixed in interface discovery wherein an error identifying
1490 a server-configured interface with no IPv4 addresses would SEGV.
1492 - Fixed a bug in which write_lease() might report a failure incorrectly
1494 - Added support for DHCPv6 Release messages
1496 - Added -x option to dhclient, which triggers dhclient processes
1497 to exit gracefully without releasing leases first
1499 - All binaries (client, server, relay) now change directories
1500 to / before going into daemon mode, so as not to hold $CWD open
1502 - Fixed a bug parsing DHCPv6 client-id's in host-identifier statements
1504 - Fixed a bug with the 'ddns-updates' boolean server configuration
1505 parameter, which caused the server to fail.
1507 Changes since 4.0.0-20070413
1509 - Old (expired) leases are now cleaned.
1511 - IPv6 subnets now have support for arbitrary allocation ranges via
1512 a new 'range6' configuration directive.
1514 - An obviated option code hash lookup to find D6O_CLIENTID was removed.
1516 - Corrected some situations where variables might be used without being
1519 - Silenced several other compiler warnings.
1521 - Include the more standard sys/uio.h rather than rely upon other
1522 header files to include it (fixes a BSD 4.2 compile failure).
1524 - Duplicate dhclient-script updates for DHCPv6 to all provided scripts.
1526 - DHCPv4 I/O methods that failed to sense hardware address were corrected.
1528 - DHCPv4 is now the default (as documented) rather than DHCPv6. The default
1529 was set to DHCPv6 to facilitate ease early development, and forgotten.
1531 - Corrected a segmentation violation in DHCPv4 socket processing.
1533 - dhclient will now fork() into the background once it binds to an
1534 IPv6 address, or immediately if the -n flag is supplied.
1536 - -q is now the default behaviour on dhclient, with -d or -v enabling
1537 non-quiet (stderr logging) mode.
1539 - Fix documentation of the domain-search atom (quoted, with commas).
1541 - Document DHCPv6 options presently in the default table.
1543 - Replaced ./configure shellscripting with GNU Autoconf.
1545 Changes since 3.1.0 (NEW FEATURES)
1547 - DHCPv6 Client and Server protocol support. Use '-6' to run the daemons
1548 as v6-only. Use '-4' to run the daemons as v4-only (default. There is
1549 no support currently for both.
1551 - Server support for multiple IA_NA options, containing at most one
1554 - Client support for one IA_NA option, containing any number of IAADDR
1557 - Server support for the DHCPv6 Information-request message.
1559 - Inappropriate unicast DHCPv6 messages sent to the server are now
1560 discarded, and this has rearchitected the IO system slightly.
1562 - The DHCPv6 server DUID defaults to type 1, is persistently stored in
1563 the leases database, and can be over-ridden (either completely, or by
1564 specifying type 1 or type 2).
1566 - The server only uses Rapid-Commit if it has been configured with the
1567 Rapid-Commit option and the client requests it.
1569 - DDNS support. We now update AAAA records in the same place we would
1570 update A records, if we have an IPv6 address. We also generate IP6.ARPA
1571 style names for PTR records if we're dealing with an IPv6 address. Both
1572 A and AAAA updates are done using the same 'fqdn.' virtual option space
1573 (although the DHCPv4 FQDN and DHCPv6 FQDN options are formatted
1574 differently, they both use the same code here).
1576 - The Linux dhclient-script attempts to set and remove assigned addresses,
1577 and to configure /etc/resolv.conf from nameserver and domain name
1578 configurations. It can be extended to configure other parameters.
1580 - Initial DHCPv6 lease support.
1582 - The IO system now tracks all local IP addresses, so that the DHCP
1583 applications (particularly the dhcrelay) can discern between what frames
1584 were transmitted to it, and what frames are being carried through it which
1585 it should not intercept.
1587 Changes since 3.1.0 (Maintenance)
1589 - A bug was repaired where MAC Address Affinity for virgin leases always
1590 mapped to the primary. Virgin leases now have an interleaved preference
1591 between primary and secondary.
1593 - A bug was repaired where MAC Address Affinity for clients with no client
1594 identifier was sometimes mishashed to the peer. Load balancing during
1595 runtime and pool rebalancing were opposing.
1597 - An assertion in lease counting relating to reserved leases was repaired.
1599 - The subnet-mask option inclusion now conforms with RFC2132 section 3.3;
1600 it will only appear prior to the routers option if it is present on the
1601 Parameter-Request-List. The subnet-mask option will also only be
1602 included by default (if it is not on the PRL) in response to DISCOVER
1603 or REQUEST messages.
1605 - The FQDN option is only supplied if the client supplied an FQDN option or
1606 if the FQDN option was explicitly requested on the PRL.
1608 - Dynamic BOOTP leases are now load balanced in failover.
1610 Changes since 3.1.0rc1
1612 - The parse warning that 'deny dyanmic bootp;' must be configured for
1613 failover protected subnets was removed.
1615 Changes since 3.1.0b2
1617 - Failover rebalance events no longer play ping pong with round errors
1618 (moving leases between free and back to backup where there are an
1619 odd number of leases).
1621 - The 'pool' log line has been split into two messages, one before the
1622 rebalance run, and one after.
1624 - Any queued BNDACKs are transmitted before transmitting new BNDUPDs.
1625 This enforces the correct sequence of events for the remote server
1626 processing these messages.
1628 Changes since 3.1.0b1
1630 - Fixed a bug that caused OMAPI clients to freeze when opening lease
1633 - A new server config option "fqdn-reply" specifies whether the server
1634 should send out option 81 (FQDN). Defaults to "on". If set to "off",
1635 the FQDN option is not sent, even if the client requested it. This is
1636 needed because some clients misbehave otherwise. Thanks to Christof Chen
1639 - Allow trace output files (-tf option) to be overwritten, rather than
1640 crashing dhcpd if the file already exists
1642 - A bug was fixed that caused dhcpd to segfault if a pool was declared
1643 outside the scope of a subnet in dhcpd.conf.
1645 - Some uninitialized values were repaired in dhcpleasequery.c that
1646 caused the server to abort.
1648 - A new server config option, 'do-reverse-updates', has been added
1649 which causes the server to abstain from performing updates on PTR
1650 records. Thanks to a patch from Christof Chen at Allianz.
1652 - A bug was repaired in subencapsulation support, where spaces separated
1653 by empty spaces would not get included.
1655 - A bug in dhclient was repaired which caused it to send parameter request
1656 lists of 55 bytes in length no matter how long the declared PRL was.
1658 - 'dhcp.c(3953): non-null pointer' has been repaired. This fixes a flaw
1659 wherein the DHCPv4 server may ignore a configured server-identifier.
1661 - A flaw in failover startup sequences was repaired that sometimes left
1662 the primary DHCP server's pool rebalance schedules unscheduled.
1664 - Corrected a flaw that broke encapsulated spaces included due to presence
1665 on the parameter request list.
1667 Changes since 3.1.0a3
1669 - Some spelling fixes.
1671 Changes since 3.1.0a2
1673 - A bug was fixed where attempting to permit leasequeries results in a
1674 fatal internal error, "Unable to find server option 49".
1676 - A bug was fixed in dhclient rendering the textual output form of the
1677 domain-search option syntax.
1679 Changes since 3.1.0a1
1681 - A bug in the FQDN universe that added FQDN codes to the NWIP universe's
1682 hash table was repaired.
1684 - The servers now try harder to transmit pending binding updates when
1685 entering normal state.
1687 - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
1688 requeues all pending updates. This should reduce the number of spurious
1689 'xid mismatch' log messages.
1691 - An option definition referencing leak was fixed, which resulted in early
1692 termination of dhclient upon the renewal event.
1694 - Some default hash table sizes were tweaked, some upwards, some downwards.
1695 3.1.0a1's tables resulted in a reduction in default server memory use.
1696 The new selected values provide more of a zero sum (increasing the size
1697 of tables likely to be populated, decreasing the size of tables unlikely).
1699 - Lease structures appear in three separate hashes: by IP address, by UID,
1700 and by hardware address. One type of table was used for all three, and
1701 improvements to IP address hashing were applied to all three (so UID and
1702 hardware addresses were treated like 4-byte integers). There are now two
1703 types of tables, and the uid/hw hashes use functions more appropriate
1706 - The max-lease-misbalance percentage no longer causes scheduled rebalance
1707 runs to be skipped: it still governs the schedule, but every scheduled
1708 run will attempt balance.
1710 - A segfault bug in recursive encapsulation support has been corrected.
1712 Changes since 3.0 (New Features)
1714 - A workaround for certain STSN servers that send a mangled domain-name
1715 option was introduced for dhclient. The client will now accept corrupted
1716 server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
1717 or NAK). The server will continue to not accept corrupt client packets.
1719 - Support for 'reserved' (pseudo-static) and BOOTP leases via failover
1722 - Support for adding, removing, and managing class and subclass statements
1725 - The failover implementation was updated to comply with revision 12 of
1728 - 'make install' now creates the initial zero-length dhcpd.leases file if
1729 one does not already exist on the system.
1731 - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
1733 - The Load Balance Algorithm was misimplemented. The current implementation
1736 - lcase() and ucase() configuration expressions have been added which adjust
1737 their arguments from upper to lower and lower to upper cases respectively.
1738 Thanks to a patch from Albert Herranz.
1740 - The dhclient 'reject ...;' statement, which rejects leases given by named
1741 server-identifiers, now permits address ranges to be specified in CIDR
1742 notation. Thanks to a patch from David Boyce.
1744 - The subnet-mask option is now supplied by default, but at lowest
1745 priority. This helps a small minority of clients that provide parameter
1746 request lists, but do not list the subnet-mask option because they were
1747 designed to interoperate with a server that behaves in this manner.
1749 - The FQDN option is similarly supplied even if it does not appear on the
1750 parameter request list, but not to the exclusion of options that do
1751 appear at the parameter request list. Up until now it had ultimate
1752 priority over the client's parameter request list.
1754 - Varying option space code and length bit widths (8/16/32) are now
1755 supported. This is a milestone in achieving RFC 3925 "VIVSO" and
1758 - A new common (server or client) option, 'db-time-format local;', has
1759 been added which prints the local time in /var/db/dhcpd.leases rather
1760 than UTC. Thanks to a patch from Ken Lalonde.
1762 - Some patches to improve DHCP Server startup speed from Andrew Matheson
1763 have been incorporated.
1765 - Failover pairs now implement 'MAC Affinity' on leases moving from the
1766 active to free states. Leases that belonged to the failover secondary
1767 are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
1768 If lease rebalancing must move leases, it tries first to move leases
1769 that belong to the peer in need.
1771 - The server no longer sends POOLREQ messages unless the pool is severely
1772 misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
1774 - Pool rebalance events no longer happen upon successfully allocating a
1775 lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
1776 min-balance and max-balance statements for more information.
1778 - The DHCP Relay Agent Information Option / Link Selection Sub-Option
1779 is now supported. (See RFC3527 for details).
1781 - A new DDNS related server option, update-conflict-detection, has been
1782 added. If this option is enabled, dhcpd will perform normal DHCID
1783 conflict resolution (the default). If this option is disabled, it will
1784 instead trust the assigned name implicitly (removing any other bindings
1785 on that name). This option has not been made available in dhclient.
1787 - In those cases where the DHCP software manufactures an IP header (to
1788 transmit via bpf, lpf, etc), the IP TTL the software selects has been
1789 increased from 16 to 128. This is intended to match Microsoft Windows
1790 DHCP Client behaviour, to increase compatibility.
1792 - 'ignore client-updates;' now has behaviour that is different from
1793 'deny client-updates;'. The client's request is not truly ignored,
1794 rather it is encouraged. Should this value be configured, the server
1795 updates DNS as though client-updates were set to 'deny'. That is, it
1796 enters into DNS whatever it is configured to do already, provided it is
1797 configured to. Then it sends a response to the client that lets the
1798 client believe it is performing client updates (which it will), probably
1799 for a different name. In essence, this lets the client do as it will,
1800 ignoring this aspect of their request.
1802 - Support for compressed 'domain name list' style DHCP option contents, and
1803 in particular the domain search option (#119) was added.
1805 - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
1806 LEASEQUERY lets you query the DHCP server for information about a lease,
1807 using either an IP address, MAC address, or client identifier. Thanks
1808 to a patch from Justin Haddad.
1810 - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
1811 ethernet mac address) on the SCO platform specifically without any strange
1812 ifconfig hacks. Many thanks go to the Kroger Co. for donating the
1813 hardware and funding the development.
1815 - A new common configuration executable statement, execute(), has been
1816 added. This permits dhcpd or dhclient to execute a named external
1817 program with command line arguments specified from other configuration
1818 language. Thanks to a patch written by Mattias Ronnblom, gotten to us
1821 - A new dhcp server option 'adaptive-lease-time-threshold' has been added
1822 which causes the server to substantially reduce lease-times if there are
1823 few (configured percentage) remaining leases. Thanks to a patch submitted
1826 - Encapsulated option spaces within encapsulated option spaces is now
1829 Changes since 3.0.6rc1
1831 - supersede_lease() now requeues leases in their respective hardware
1832 address hash bucket. This mirrors client identifier behaviour.
1836 - Assorted fixes for broken network devices: Packet length is now
1837 determined from the IP header length field to finally calculate the
1838 UDP payload length, because some NIC drivers return more data than
1839 they actually received.
1841 - UDP packets are now stored in aligned data structures.
1843 - A logic error in omapi interface code was repaired that might result in
1844 incorrectly indicating 'up' state when any flags were set, rather than
1845 specifically the INTERFACE_REQUESTED flag. Thanks to a patch from
1846 Jochen Voss which got to us via Andrew Pollock at Debian.
1848 - A reference leak on binding scopes set by ddns updates was repaired.
1850 - A memory leak in the minires_nsendsigned() function call was repaired.
1851 Effectively, this leaked ~176 bytes per DDNS update.
1853 - In the case where an "L2" DHCP Relay Agent (one that does not set giaddr)
1854 was directly attached to the same broadcast domain as the DHCP server,
1855 the RFC3046 relay agent information option was not being returned to the
1856 relay in the server's replies. This was fixed; the dhcp server no longer
1857 requires the giaddr to reply with relay agent information. Note that
1858 this also improves compatibility with L2 devices that "intercept" DHCP
1859 packets and expect relay agent information even in unicast (renewal)
1860 replies. Thanks to a patch from Pekka Silvonen.
1862 - A bug was fixed where the BOOTP header 'sname' field had a value, the
1863 copy written to persistent storage was actually the contents of the
1866 - A bug was fixed where the nwip virtual option space was referencing
1867 the fqdn option's virtual option space's option cache.
1869 - Timestamp parsing errors that indicated missing "minutes" fields rather
1870 than the actually missing "seconds" fields have been repaired thanks to
1871 a patch from Kevin Steves.
1873 - A grammar error in the dhclient.8 manpage was repaired thanks to a patch
1876 - Several spelling typos were repaired, and some cross-references to other
1877 relevant documents were included in the manpages, thanks to a patch
1878 by Andrew Pollock which got to us via Tomas Pospisek.
1880 - Some bugs were fixed in the 'emergency relay agent options hologram'
1881 which is used to retain relay agent option contents from when the
1882 client was in INIT or REBIND states. This should solve problems where
1883 relay agent options were not echoed from the server, even when giaddr
1886 - dhclient now closes its descriptor to dhclient.leases prior to executing
1887 dhclient-script. Thanks to a patch from Tomas Pospisek.
1889 - The server's "by client-id" and "by hardware address" hash table lists
1890 are now sorted according to the preference to re-allocate that lease to
1891 returning clients. This should eliminate pool starvation problems
1892 arising when "INIT" clients were given new leases rather than presently
1895 Changes since 3.0.5rc1
1897 - A bug was repaired in fixes to the dhclient, which sought to run the
1898 dhclient-script with the 'EXPIRE' state should it receive a NAK in
1899 response to a REQUEST. The client now iterates the PREINIT state
1900 after the EXPIRE state, so that interfaces that might be configured
1901 'down' can be brought back 'up' and initialized.
1903 - DHCPINFORM handling for clients that properly set ciaddr and come to the
1904 server via a relay aget has been repaired.
1908 - A warning that host statements declared within subnet or shared-network
1909 scopes are actually global has been added.
1911 - The default minimum lease time (if min-lease-time was not specified)
1912 was raised from 0 to 300. 0 is not thought to be sensible, and is
1913 known to be damaging.
1915 - Added additional fatal error sanity checks surrounding lease binding
1916 state count calculations (free/active counts used for failover pool
1919 - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
1920 misapplied to server values rather than client values. The server no longer
1921 advertises 8-byte lease-time options when on 64-bit platforms.
1923 - A bug where leases not in ACTIVE state would get billed to billed classes
1924 (classes with lease limitations) was fixed. Non-active leases OFFERed
1925 to clients are no longer billed (but billing is checked before offering).
1927 - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
1928 configuration option - the default configuration and results should be
1931 - If the dhclient were to receive a DHCPNAK while it was in the RENEW
1932 state (and consequently, had an active, 'bound' address and related
1933 configuration options), it would fail to 'tear down' this information
1934 before proceeding into INIT state. dhclient now iterates the dhclient-
1935 script with the 'EXPIRE' action to cause these teardowns prior to entering
1936 INIT state. Thanks to a patch from Chris Zimmerman.
1938 - The omapi.1 manpage had some formatting errors repaired thanks to a patch
1939 from Yoshihiko Sarumaru.
1941 - A few lines of code that were failover-specific were moved within
1942 #if defined() clauses so that compilation without failover could be
1945 - The log message emitted when the 'leased-address' value was not available
1946 in dhcpd.conf "executable statements" has been updated to be more helpful.
1947 Manpage information for this value has also been updated.
1949 - Abandoned or dissociated (err condition) leases now remove any related
1950 dynamic dns bindings. Thanks to a patch from Patrick Schoo.
1952 - Attempting to write a new lease file to replace a corrupt (due to
1953 encountering non-retryable errors during writing) lease file should
1954 no longer result in an infinite recursion.
1956 - Host declaration hardware addresses and client identifiers may only be
1957 configured once. dhcpd will now fail to load config files that specify
1958 multiple identifiers (previous versions would silently over-ride the
1959 value with the later configured value).
1961 - Several option codes that have been allocated since our last release
1962 have been named and documented.
1964 - Option names of the form "unknown-123" have been removed from the in-
1965 memory hash tables. In order to support options of these names that
1966 may appear in dhclient.leases or similar in previous versions, the
1967 parser will now find the new option code definition, or mock up a
1968 generic option code definition. This should result in a smooth
1969 transition from one name to the other, as the new name is used to
1972 Changes since 3.0.4rc1
1974 - The dhcp-options.5 manpage was updated to correct indentation errors
1975 thanks to a patch from Jean Delvare.
1977 Changes since 3.0.4b3
1979 - Some manual pages were clarified pursuant to discussion on the dhcp-server
1982 Changes since 3.0.4b2
1984 - Null-termination sensing for certain clients that unfortunately require
1985 it in DHCPINFORM processing was repaired.
1987 - The host-name option and a few others were moved from "X" format to "t"
1988 format to be compatible with new NULL handling functions.
1990 - DHCPINFORM processing is a little more careful about return addressing
1991 its responses, or if responding via a relay. The INFORM related
1992 messages also log the 'effective client ip address' rather than the
1993 client's supplied ciaddr (since some clients produce null ciaddrs).
1995 - The server was inappropriately sending leases to the RESET state in the
1996 event that multiple active leases were found to match a singly-identified
1997 client. This was changed to RELEASED (by accepting a different, ACTIVE
1998 binding, the client is implicitly releasing its lease). This repairs a
1999 bug wherein secondary servers in failover pairs detecting this condition
2000 move leases to RESET, and primaries refuse to accept that state
2001 transition (properly).
2003 - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
2005 Changes since 3.0.4b1
2007 - Command line parsing in omshell was repaired - it no longer closes
2008 STDIN after reading one line.
2010 - The resolver library no longer closes the /etc/resolv.conf file
2011 descriptor it opened twice.
2013 - Changes to trailing NULL removal in 't' option-atoms has been rethought,
2014 it now includes 'd' (domain name) types, and tries hard not to rewind an
2015 option beyond the start of the text field it is un-terminating.
2019 - A DDNS update handling function was misusing the DNS error codes, rather
2020 than the internal generic result enumeration. The result is a confusing
2021 syslog line, logging the wrong condition.
2023 - The DHCP Server was not checking pool balance in the case where it brought
2024 a non-ACTIVE lease out of storage for a client that was returning to use
2025 a lease it once had long ago, and had since expired.
2027 - Failover peers no longer bother to look for free leases to allocate when
2028 they already found the client's ACTIVE lease. DISCOVERs are load balanced
2029 whether freely-allocated or not, unless the server doubts the peer has
2032 - Fixed a bug in dhcrelay agent addition code that suppressed trailing
2033 PAD options - it was suppressing only one trailing PAD option, rather
2034 than the entire block of them.
2036 ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
2037 option addition and stripping code. Added a few sanity checks. Although
2038 highly improbable, due to requiring the reception of a DHCP datagram well
2039 in excess of all known to be used physical MTU limitations, it is possible
2040 this may have been used in a stack overflow security vulnerability. Thanks
2041 to a patch from infamous42md.
2043 ! Added some sanity checks to OMAPI connection/authentication code.
2044 Although highly improbable, due to having to deliver in excess of 2^32
2045 bytes of data via the OMAPI channel, not to mention requiring dhcpd to
2046 be able to malloc() a memory region 2^32 bytes in size, it was possible
2047 this might have resulted in a heap overflow security vulnerability.
2048 Thanks to a patch from infamous42md.
2050 - dmalloc() memset()'s the non-debug (data) portion of the allocated
2051 memory to zero. Code that memset()'s the result returned by dmalloc() to
2052 zero is redundant. These redundancies were removed.
2054 - Some type declaration corrections to u_int16_t were made in common/tr.c
2055 (Token Ring support) thanks to a patch from Jason Vas Dias at Red Hat.
2057 - A failover bug that was allowing leases that EXPIRED or were RELEASED
2058 where tsfp and tstp are identical timestamps to languish in these
2059 transitional states has been repaired. As a side effect, lease
2060 databases should be kept more consistent overall, not just for these
2061 transitional states.
2063 - If the lease db is deleted out from under the daemon, and it moves to rewrite
2064 the db, it will go ahead with the operation and move the new db into place
2065 once it detects the old db does not exist.
2067 - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
2068 is either nonsensical or (in the case of IEEE1394) is not known to support
2069 these interfaces. Thanks to Marius Gedminas and Andrew Pollock of Debian.
2071 - Some previously undocumented reasons for dhclient-script invoking has
2072 been documented in the dhclient-script.8 manpage.
2074 - Failover potential expiry calculations (TSTP) have been corrected. Results
2075 should be substantially more consistent, and proper given the constraints.
2077 - Adjusted lease state validation checks in potential-conflict, to
2078 account for possible clock skew similarly to normal state, and several
2079 previously illegal transitions were made legal (ex: active->released).
2081 - An impossible sanity check was removed from omapi/buffer.c, thanks to a
2082 patch from 'infamous42md'.
2084 - An OMAPI host/network byte order problem in lease time values has been
2087 - Several minor bugs, largely relating to treating 8-byte time values as
2088 4-byte entities, have been repaired after careful review of the FreeBSD
2089 ports collection's patch set. Thanks to the nameless entities who have
2090 contributed to the FreeBSD ports.
2092 - When writing a trace file, the file is now created with permissions 0600,
2093 to help administrators avoid accidentally publicising sensitive config
2096 - The calculation of the maximum size of DHCP packets no longer includes
2097 Ethernet framing overhead. The result is that the 'Maximum Message
2098 Size' option advertised by clients, or the default value 576, is no
2099 longer reduced by 14 bytes, and instead directly reflects the IP level
2100 MTU (and the default, minimum allowed IP MTU of 576).
2102 - The special status of RELEASED/EXPIRED/RESET leases when a server
2103 is operating in partner-down was fixed. It no longer requires a
2104 lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
2105 event to turn these into FREE leases without peer acknowledgement
2106 (after STOS+MCLT) has been repaired.
2108 - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
2111 - "append"ing a string onto the end of a "t" type option (such as the
2112 domain-name field) that had been improperly NULL-terminated by the
2113 DHCP server will no longer result in a truncated string containing
2114 only the option from the server, and not the expected appended value.
2115 Thanks to a patch from Jason Vas Dias at Red Hat.
2117 - File handlers on configuration state (config files and lease dbs) should
2118 be treated consistently, regardless of whether TRACING is defined or not.
2120 - The Linux build environment has had some minor improvements - better
2121 sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
2122 and corrections to #if operators regarding LINUX_MAJOR should it ever
2125 - The server now tries harder to survive the condition where it is unable
2126 to open a new lease file to rewrite the lease state database.
2128 Changes since 3.0.3b3
2130 - dhclient.conf documentation for interface {} was updated to reflect recent
2131 discussion on the dhcp-hackers mailing list.
2133 - In response to reports that the software does not compile on GCC 4.0.0,
2134 -Werror was removed from Makefile.conf for all platforms that used it.
2135 We will address the true problem in a future release; this is a temporary
2138 Changes since 3.0.3b2
2140 - An error in code changes introduced in 3.0.3b2 was corrected, which caused
2141 static BOOTP clients to receive random addresses.
2143 Changes since 3.0.3b1
2145 - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
2146 host records would be left behind on leases that were not allocated to the
2147 client currently booting (eg in the case where the host was denied booting).
2149 - The dhcpd.conf.5 manpage was updated to be more clear in regards to
2150 multiple host declarations (thanks to Vincent McIntyre). 'Interim' style
2151 dynamic updates were also retouched.
2155 - A bug was fixed where a server might load balance a DHCP REQUEST to its
2156 peer after already choosing not to load balance the preceding DISCOVER.
2157 The peer cannot allocate the originating server's lease.
2159 - In the case where a secondary server lost its stable storage while the
2160 primary was still in communications-interrupted, and came back online,
2161 the lease databases would not be fully transferred to the secondary.
2162 This was due to the secondary errantly sending an extra UPDREQ message
2163 when the primary made its state transition to PARTNER-DOWN known.
2165 - The package will now compile cleanly in gcc 3.3 and 3.4. As a side effect,
2166 lease structures will be 9 bytes smaller on all platforms. Thanks to
2167 Jason Vas Dias at Red Hat.
2169 - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
2170 properly restricted to only detecting broadcast interfaces. Thanks
2171 to a patch from Jason Vas Dias at Red Hat.
2173 - decode_udp_ip_header was changed so that the IP address was copied out
2174 to a variable, rather than referenced by a pointer. This enforces 4-byte
2175 alignment of the 32-bit IP address value. Thanks to a patch from Dr.
2178 - An incorrect log message was corrected thanks to a patch from
2181 - A bug in DDNS was repaired, where if the server's first DDNS action was
2182 a DDNS removal rather than a DDNS update, the resolver library's
2183 retransmit timer and retry timer was set to the default, implying a
2184 15 second timeout interval. Which is a little excessive in a synchronous,
2185 single-threaded system. In all cases, ISC DHCP should now hold fast to
2186 a 1-second timeout, trying only once.
2188 - The siaddr field was being improperly set to the server-identifier when
2189 responding to DHCP messages. RFC2131 clarified the siaddr field as
2190 meaning the 'next server in the bootstrap process', eg a tftp server.
2191 The siaddr field is now left zeroed unless next-server is configured.
2193 - mockup_lease() could have returned in an error condition (or in the
2194 condition where no fixed-address was found matching the shared
2195 network) with stale references to a host record. This is probably not
2196 a memory leak since host records generally never die anyway.
2198 - A bug was repaired where failover servers would let stale client identifiers
2199 persist on leases that were reallocated to new clients not sending an id.
2201 - Binding scopes ("set var = value;") are now removed from leases allocated
2202 by failover peers if the lease had expired. This should help reduce the
2203 number of stale binding scopes on leases.
2205 - A small memory leak was closed involving client identifiers larger than
2206 7 bytes, and failover.
2208 - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
2209 cause an internal function to overflow heap. Thanks to Jason Vas Dias
2212 - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
2213 or 'NUMBER_OR_NAME' was repaired. Hexadecimal parsing is affected, and
2216 - In several cases, parse warnings were being issued before the lexical
2217 token had been advanced to the token whose value was causing an error...
2218 causing parse warnings to claim the problem is on the wrong token.
2220 - Host declarations matching on client identifier for dynamic leases will
2221 no longer match fixed-address host declarations (this is now identical
2222 to behaviour for host records matching on hardware address).
2224 Changes since 3.0.2rc3
2226 - A previously undocumented configuration directive, 'local-address',
2227 was documented in the dhcpd.conf manpage.
2229 Changes since 3.0.2rc2
2231 - Two variables introduced in 3.0.2b1 were used without being initialized
2232 in the case where neither the FILE nor SNAME fields were available for
2233 overloading. This was repaired.
2235 - A heretofore believed to be impossible corner case of the option
2236 overloading implementation turned out to be possible ("Unable to sort
2237 overloaded options after 10 tries."). The implementation was reworked
2238 to consider the case of an option so large it would require more than
2239 three chunks to fit.
2241 - Many other instances of variables being used without being initialized
2244 - An uninitialized variable in omapi_io_destroy() led to the discovery
2245 that this function may result in orphaned pointers (and hence, a memory
2248 Changes since 3.0.2rc1
2250 - allocate_lease() was rewritten to repair a bug in which the server would
2251 try to allocate an ABANDONED lease when FREE leases were available.
2253 Changes since 3.0.2b1
2255 - Some dhcp-eval.5 manpage formatting was repaired.
2259 - A bug was fixed in the server's 'option overloading' implementation,
2260 where options loaded into the 'file' and 'sname' packet fields were
2261 not aligned precisely as rfc2131 dictates.
2263 - The FreeBSD client script was changed to support the case where a domain
2264 name was not provided by the server.
2266 - A memory leak in 'omshell' per each command line parsed was
2267 repaired, thanks to a patch from Jarkko Torppa.
2269 - Log functions writing to stderr were adjusted to use the STDERR_FILENO
2270 system definition rather than '2'. This is a no-op for 90% of platforms.
2272 - One call to trace_write_packet_iov() counted the number of io vectors
2273 incorrectly, causing inconsistent tracefiles. This was fixed.
2275 - Some expression parse failure memory leaks were closed.
2277 - A host byte order problem in tracefiles was repaired.
2279 - Pools configured in DHCPD for failover possessing permission lists that
2280 previously were assumed to not include dyanmic bootp clients are now
2281 a little more pessimistic. The result is, dhcpd will nag you about just
2282 about most pools that possess a 'allow' statement with no 'deny' that
2283 would definitely match a dynamic bootp client.
2285 - The 'ddns-update-style' configuration warning bit now insists that
2286 the configuration be globally scoped.
2288 - Two memory leaks in dhclient were closed thanks to a patch from Felix
2291 - Some minor but excellently pedantic documentation errors were fixed
2292 thanks to a patch from Thomas Klausner.
2294 - Bugs in operator precedence in executable statements have been repaired
2295 once again. More legal syntaxes should be parsed legally.
2297 - Failing to initialize a tracefile for any reason if a tracefile was
2298 specified is now a fatal error. Thanks to a patch from Albert Herranz.
2300 - Corrected a bug in which the number of leases transferred as calculated
2301 by the failover primary and sent to peers in POOLRESP responses may be
2302 incorrect. This value is not believed to be used by other failover
2303 implementations, excepting perhaps as logged information.
2305 - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
2306 sending POOLREQ messages instead of POOLRESP mesasges. This message
2307 was essentially ignored since failover secondaries effectively do not
2308 respond to POOLREQ messages.
2310 - Type definitions for various bitwidths of integers in the sunos5-5
2311 build of ISC DHCP have been fixed. It should compile and run more
2312 easily when built in 64-bit for this platform.
2314 - "allow known-clients;" is now a legal syntax, to avoid confusion.
2316 - If one dhcp server chooses to 'load balance' a request to its failover
2317 peer, it first checks to see if it believes said peer has a free
2318 lease to allocate before ignoring the DISCOVER.
2320 - log() was logging a work buffer, rather than the value returned by
2321 executing the statements configured by the user. In some cases,
2322 the work buffer and the intended results were the same. In some other
2323 cases, they were not. This was fixed thanks to a patch from Gunnar
2324 Fjone and directconnect.no.
2326 - Compiler warnings for some string type conversions was fixed, thanks
2327 to Andreas Gustafsson.
2329 - The netbsd build environments were simplified to one, in which
2330 -Wconversion is not used, thanks to Andreas Gustafsson.
2332 - How randomness in the backoff-cutoff dhclient configuration variable
2333 is implemented was better documented in the manpage, and the behaviour
2334 of dhclient in REQUEST timeout handling was changed to match that of
2335 DISCOVER timeout handling.
2337 - Omapi was hardened against clients that pass in null values, thanks
2338 to a patch from Mark Jason Dominus.
2340 - A bug was fixed in dhclient that kept it from doing client-side
2341 ddns updates. Thanks to a patch from Andreas Gustafsson, which
2342 underwent some modification after review by Jason Vas Dias.
2344 - Failover implementations disconnected due to the network between
2345 them (rather than one of the two shutting down) will now try to
2346 re-establish the failover connection every 5 seconds, rather than
2347 to simply try once and give up until one of them is restarted.
2348 Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
2349 by Greger V. Teigre which led to an enhancement to it.
2351 - A problem that kept DHCP Failover secondaries from tearing down
2352 ddns records was repaired. Thanks to a patch from Ulf Ekberg from
2355 - 64bit pointer sizes are detected properly on FreeBSD now.
2357 - A bug was repaired where the DHCP server would leave stale references
2358 to host records on leases it once thought about offering to certain
2359 clients. The result would be to apply host and 'known' scopes to the
2360 wrong clients (possibly denying booting). NOTE: The 'mis-host' patch
2361 that was being circulated as a workaround is not the way this bug was
2362 fixed. If you were a victim of this bug in 3.0.1, you are cautioned
2363 to proceed carefully and see if it fixes your problem.
2365 - A bug was repaired in the server's DHCPINFORM handling, where it
2366 tried to divine the client's address from the source packet and
2367 would get it wrong. Thanks to Anshuman Singh Rawat.
2369 - A log message was introduced to help illuminate the case where the
2370 server was unable to find a lease to assign to any BOOTP client.
2371 Thanks to Daniel Baker.
2373 - A minor dhcpd.conf.5 manpage error was fixed.
2375 Changes since 3.0.1rc14
2377 - The global variable 'cur_time' was centralized and is now uniformly of a
2378 type #defined in system-dependent headers. It had previously been defined
2379 in one of many places as a 32-bit value, and this causes mayhem on 64-bit
2380 big endian systems. It probably wasn't too healthy on little endian
2383 - A printf format string error introduced in rc14 was repaired.
2385 - AIX system-dependent header file was altered to only define NO_SNPRINTF
2386 if the condition used to #ifdef in vsnprintf in AIX' header files
2389 - The Alpha/OSF system-dependent header file was altered to define
2390 NO_SNPRINTF on OS revisions older than 4.0G.
2392 - omapip/test.c had string.h added to its includes.
2394 Changes since 3.0.1rc13
2396 ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
2397 in logging messages with excessively long hostnames provided by the
2398 clients. It is highly probable that these could have been used by
2399 attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
2400 release candidates 12 or 13. Special thanks to Gregory Duchemin for
2401 both finding and solving the problem.
2403 ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
2404 in log_*() functions was evidenced, on some specific platforms where
2405 vsnprintf() was not believed to be available and calls were wrapped to
2406 sprintf() instead. Again, credit goes to Gregory Duchemin for finding
2407 the problem. Calls to snprintf() are now linked to a distribution-local
2408 snprintf implementation, only in those cases where the architecture is
2409 not known to provide one (see includes/cf/[arch].h). If you experience
2410 linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
2411 is where to look. This vulnerability did not exist in any previously
2412 published version of ISC DHCP.
2414 - Compilation on hpux 11.11 was repaired.
2416 - 'The cross-compile bug fix' was backed out.
2418 Changes since 3.0.1rc12
2420 - Fixed a bug in omapi lease lookup function, to form the hardware
2421 address for the hash lookup correctly, thanks to a patch from
2424 - Fixed a bug where dhcrelay was sending relayed responses back to the
2425 broadcast address, but with the source's unicast mac address. Should
2426 now conform to rfc2131 section 4.1.
2428 - Cross-compile bug fix; use $(AR) instead of ar. Thanks to Morten Brorup.
2430 - Fixed a crash bug in dhclient where dhcpd servers that do not provide
2431 renewal times results in an FPE. As a side effect, dhclient can now
2432 properly handle 0xFFFFFFFF (-1) expiry times supplied by servers. Thanks
2433 to a patch from Burt Silverman.
2435 - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
2436 and reformatted to correct a compilation error on Solaris platforms.
2438 - A patch was applied which fixes a case where leases read from the
2439 leases database do not properly over-ride previously read leases.
2441 - dhcpctl.3 manpage was tweaked.
2443 Changes since 3.0.1rc11
2445 - A patch from Steve Campbell was applied with minor modifications to
2446 permit reverse dns PTR record updates with values containing spaces.
2448 - A patch from Florian Lohoff was applied with some modifications to
2449 dhcrelay. It now discards packets whose hop count exceeds 10 by default,
2450 and a command-line option (-c) can be used to set this threshold.
2452 - A failover bug relating to identifying peers by name length instead of
2455 - Declaring failover configs within shared-network statements should no
2456 longer result in error.
2458 - The -nw command line option to dhclient now works.
2460 - Thanks to a patch from Michael Richardson:
2461 - Some problems with long option processing have been fixed.
2462 - Some fixes to minires so that updates of KEY records will work.
2464 - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
2465 see contrib/ms2isc/readme.txt for revision notes.
2467 - Dhclient no longer uses shell commands to kill another instance of
2468 itself, it sends the signal directly. Thanks to a patch from Martin
2471 - The FreeBSD dhclient-script was changed so that a failure to write to
2472 /etc/resolv.conf does not prematurely end the script. This keeps dhclient
2473 from looping infinitely when this is the case. Thanks to a patch from
2476 - A patch from Bill Stephens was applied which resolves a problem with lease
2477 expiry times in failover configurations.
2479 - A memory leak in configuration parsing was closed thanks to a patch from
2482 - The function which discovers interfaces will now skip non-broadcast or
2483 point-to-point interfaces, thanks to a patch from David Brownlee.
2485 - Options not yet known by the dhcpd or dhclient have had their names
2486 changed such that they do not contain # symbols, in case they should ever
2487 appear in a lease file. An option that might have been named "#144" is
2490 - Another patch from Bill Stephens which allows the ping-check timeout to
2491 be configured as 'ping-timeout'. Defaults to 1.
2493 Changes since 3.0.1rc10
2495 - Potential buffer overflows in minires repaired.
2497 - A change to the linux client script to use /bin/bash, since /bin/sh may
2500 - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
2502 - A correction of boolean parsing syntax validation - some illegal syntaxes
2503 that worked before are now detected and produce errs, some legal syntaxes
2504 that errored before will now work properly.
2506 - Some search-and-replace errors that caused some options to change their
2509 - Shu-min Chang of the Intel corporation has contributed a perl script and
2510 module that converts the MS NT4 DHCP configuration to a ISC DHCP3
2513 - Applied the remainder of the dhcpctl memory leak patch provided by Bill
2514 Squier at ReefEdge, Inc. (groo@reefedge.com).
2516 - Missing non-optional failover peer configurations will now result in a soft
2517 error rather than a null dereference.
2519 Changes since 3.0.1rc9
2521 - A format string was corrected to fix compiler warnings.
2523 - A number of spelling corrections were made in the man pages.
2525 - The dhclient.conf.5 man page was changed to refer to do-forward-updates
2526 rather than a configuration option that doesn't exist.
2528 - A FreeBSD-specific bug in the interface removal handling was fixed.
2530 - A Linux-specific Token Ring detection problem was fixed.
2532 - Hashes removed from as-yet-unknown agent options, having those options
2533 appear in reality before we know about them will no longer produce
2534 self-corrupting lease databases.
2536 - dhclient will use the proper port numbers now when using the -g option.
2538 - A order-of-operations bug with 2 match clauses in 1 class statement is
2539 fixed thanks to a patch from Andrew Matheson.
2541 - Compilation problems on Solaris were fixed.
2543 - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
2545 - A fix to the dhcp ack process which makes certain group options will be
2546 included in the first DHCPOFFER message was made thanks to a patch from
2549 - A few memory leaks were repaired thanks to patches from Bill Squier at
2550 ReefEdge, Inc. (groo@reefedge.com).
2552 - A fix for shared-networks that sometimes give clients options for the
2553 wrong subnets (in particular, 'option routers') was applied, thanks to
2554 Ted Lemon for the patch.
2556 - Omshell's handling of dotted octets as values was changed such that dots
2557 one after the other produce zero values in the integer string.
2559 Changes since 3.0.1rc8
2561 - Fix a format string vulnerability in the server that could lead to a
2562 remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
2564 - Add additional support for NetBSD/sparc64.
2566 - Fix a bug in the command-line parsing of the client. Also, resolve
2569 - Add better support for shells other than bash in the Linux client
2572 - Various build fixes for modern versions of FreeBSD and Linux.
2574 - Fix a bad bounds check when printing binding state names.
2576 - Clarify documentation about fixed-address and multiple addresses.
2578 - Fix a typo in the authoritative error message.
2580 - Make a log entry when we can't write a billing class.
2582 - Use conversion targets that are the right size on all architectures.
2584 - Increment the hop count when relaying.
2586 - Log a message when lease state is changed through OMAPI.
2588 - Don't rerun the shared_network when evaluating the pool.
2590 - Fix a reversed test in the parser.
2592 - Change the type of rbuf_max.
2594 - Make FTS_LAST a manifest constant to quiet warnings.
2596 Changes since 3.0.1rc7
2598 - Fix two compiler warnings that are generated when compiling on Solaris
2599 with gcc. These stop the build, even though they weren't actually
2600 errors, because we prefer that our builds generate no warnings.
2602 Changes since 3.0.1rc6
2604 - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
2607 - Implement lease stealing for cases where the primary has fewer leases
2608 than the secondary, as called for by the standard.
2610 - Add a fudge factor to the lease expiry acceptance code, (suggested
2611 by Kevin Miller of CMU).
2613 - Fix a bug in permit_list_match that made it much too willing to say
2614 that two permit lists matched.
2616 - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
2617 also more compact) messages about DNS updates.
2619 - Fix a bug in generating wire-format domain names for the FQDN option.
2621 - Fix a bug where the FQDN option would not be returned if the client
2622 requested it, contrary to the standard.
2624 - On Darwin, use the FreeBSD DHCP client script.
2626 - On NetBSD/sparc, don't check for casting warnings.
2628 - Add a flag in the DHCP client to disable updating the client's A
2629 record when sending an FQDN option indicating that the client is
2630 going to update its A record.
2632 - In the client, don't attempt a DNS update until one second after
2633 configuring the new IP address, and if the update times out, keep
2634 trying until a response, positive or negative, is received from the
2637 - Fix an uninitialized memory bug in the DHCP client.
2639 - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
2641 - Fix a bug in ns_parserr(), where it was returning the wrong sort
2642 of result code in some cases (suggested by Ben Harris of the
2645 - Fix a bug in is_identifier(), where it was checking against EOF
2646 instead of the END_OF_FILE token (also suggested by Ben Harris).
2648 - Fix a bug where if an option universe contained no options, the
2649 DHCP server could dump core (Walter Steiner).
2651 - Fix a bug in the handling of encapsulated options.
2653 - Fix a bug that prevented NWIP suboptions from being processed.
2655 - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
2656 as modifier flags to the FTS_ACTIVE state, as called for in the
2657 failover protocol standard.
2659 - Fix bugs in the pool merging code that resulted in references and
2660 dereferences of null pointers. This bug had no impact unless the
2661 POINTER_DEBUG flag was defined.
2663 - In the server, added a do-forward-updates flag that can be used to
2664 disable forward updates in all cases, so that sites that want the
2665 clients to take sole responsibility for updating their A record can
2668 - Make it possible to disable optimization of PTR record updates.
2670 Changes since 3.0.1rc5
2672 - Include some new documentation and changes provided by Karl Auer.
2674 - Add a workaround for some Lexmark printers that send a double-NUL-
2675 terminated host-name option, which would break DNS updates.
2677 - Fix an off-by-one error in the MAC-address checking code for
2678 DHCPRELEASE that was added in 3.0.1rc5.
2680 - Fix a bug where client-specific information was not being discarded
2681 from the lease when it expired or was released, resulting in
2682 problems if the lease was reallocated to a different client.
2684 - If more than one allocation pool is specified that has the same set
2685 of constraints as another allocation pool on the same shared
2686 network, merge the two pools.
2688 - Don't print an error in fallback_discard, since this just causes
2689 confusion and does not appear to be helping to encourage anyone to
2692 Changes since 3.0.1rc4
2694 - Fix a bug that would cause the DHCP server to spin if asked to parse
2695 a certain kind of incorrect statement.
2697 - Fix a related bug that would prevent an error from being reported in
2700 - Additional documentation.
2702 - Make sure that the hardware address matches the lease when
2703 processing a DHCPRELEASE message.
2705 Changes since 3.0.1rc3
2707 - A minor bug fix in the arguments to a logging function call.
2708 - Documentation update for dhcpd.conf.
2710 Changes since 3.0.1rc2
2712 - Allow the primary to send a POOLREQ message. This isn't what the current
2713 failover draft says to do, so we may have to back it out if I can't get the
2714 authors to relent, but the scheme for balancing that's specified in the
2715 current draft seems needlessly hairy, so I'm floating a trial balloon.
2716 The rc1 code did not implement the method described in the draft either.
2718 Changes since 3.0.1rc1
2720 - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
2721 domain or RRSET. This allows the DHCP server to forget about a name
2722 it added to the DNS once it's been removed, even if the DHCP server
2723 wasn't the one that removed it.
2725 - Install defaults for failover maximum outstanding updates and maximum
2726 silent time. This prevents problems that might occur if these values
2727 were not configured.
2729 - Don't do DDNS deletes if ddns-update-style is none.
2731 - Return relay agent information options in DHCPNAK. This prevents DHCPNAK
2732 messages from being dropped when the relay agent information option contains
2733 routing information.
2735 - Fix a problem where coming up in recover wouldn't result in an update
2738 - Add some more chatty messages when we start a recovery update and when it's
2741 - Fix a possible problem where some state might have been left around
2742 after the peer lost contact and regained contact about how many updates
2745 - Don't nix a lease update because of a lease conflict. This test has
2746 never (as far as I know) prevented a mistake, and it appears to cause
2747 problems with failover.
2749 - Add support in rc history code for keeping a selective history, rather
2750 than a history of all references and dereferences. This code is only used
2751 when extensive additional debugging is enabled.
2755 - Make allocators for hash tables. As a side effect, this fixes a memory
2756 smash in the subclass allocation code.
2758 - Fix a small bug in omshell where if you try to close an object when
2759 no object is open, it dumps core.
2761 - Fix an obscure coredump that could occur on shutdown.
2763 - Fix a bug in the recording of host declaration rubouts in the lease file.
2765 - Fix two potential spins in the host deletion code.
2767 - Fix a core dump that would happen if an application tried to update
2768 a host object attribute with a null value.
2770 Changes since 3.0 Release Candidate 12
2772 - Fix a memory leak in the evaluation code.
2774 - Fix an obscure core dump.
2776 - Print a couple of new warnings when parsing the configuration file
2777 when crucial information is left out.
2779 - Log "no free leases" as an error.
2781 - Documentation updates.
2783 Changes since 3.0 Release Candidate 11
2785 - Always return a subnet selection option if one is sent.
2787 - Fix a warning that was being printed because an automatic data
2788 structure wasn't zeroed.
2790 - Fix some failover state transitions that were being handled
2793 - When supersede_lease is called on a lease whose end time has already
2794 expired, but for which a state transition has not yet been done, do
2795 a state transition. This fixes the case where if the secondary
2796 allocated a lease to a client and the lease "expired" while the
2797 secondary was in partner-down, no expiry event would actually
2798 happen, so the lease would remain active until the primary was
2801 Changes since 3.0 Release Candidate 10
2803 - Fix a bug that was preventing released leases from changing state
2804 in failover-enabled pools.
2806 - Fix a core dump in the client identifier finder code (for host
2809 - Finish fixing a bug where bogus data would sometimes get logged to
2810 the dhclient.leases file because it was opened as descriptor 2.
2812 - Fix the Linux dhclient-script according to suggestions made by
2813 several people on the dhcp-client mailing list.
2815 - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
2817 - Print an error message and refuse to run if a failover peer is
2818 defined but not referenced by any pools.
2820 - Correct a confusing error message in failover.
2822 Changes since 3.0 Release Candidate 9
2824 - Fix a bug in lease allocation for Dynamic BOOTP clients.
2826 Changes since 3.0 Release Candidate 8 Patchlevel 2
2828 - Fix a bug that prevented update-static-leases from working.
2830 - Document failover-state OMAPI object.
2832 - Fix a compilation error on SunOS 4.
2834 Changes since 3.0 Release Candidate 8 Patchlevel 1
2836 - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
2837 This was introduced in rc8pl1 as an unintended result of the memory
2838 leakage fixes that were in pl1.
2840 - Fix a long-standing bug where the server would record that an update
2841 had been done for a client with no name, even though no update had
2842 been done, and then when the client's lease expired the deletion of
2843 that nonexistant record would time out because the name was the null
2846 - Clean up the omshell, dhcpctl and omapi man pages a bit.
2848 Changes since 3.0 Release Candidate 8
2850 - Fix a bug that could cause the DHCP server to spin if
2851 one-lease-per-client was enabled.
2853 - Fix a bug that was causing core dumps on BSD/os in the presence of
2856 - In partner-down state, don't restrict lease lengths to MCLT.
2858 - On the failover secondary, record the MCLT received from the primary
2859 so that if we come up without a connection to the primary we don't
2860 wind up giving out zero-length leases.
2862 - Fix some compilation problems on BSD/os.
2864 - Fix a bunch of memory leaks.
2866 - Fix a couple of bugs in the option printer.
2868 - Fix an obscure error reporting bug in the dns update code, and also
2869 make the message clearer when a key algorithm isn't supported.
2871 - Fix a bug in the tracing code that prevented trace runs that used
2872 tcp connections from being played back.
2874 - Add some additional debugging capability for catching memory leaks
2877 - Make the client release the lease correctly on shutdown.
2879 - Add some configurability to the build system.
2881 - Install omshell manual page in man1, not man8.
2883 - Craig Gwydir sent in a patch that fixes a long-standing bug in the
2884 DHCP client that could cause core dumps, but that for some reason
2885 hadn't been noticed until now.
2887 Changes since 3.0 Release Candidate 7
2889 - Fix a bug in failover where we weren't sending updates after a
2890 transition from communications-interrupted to normal.
2892 - Handle expired/released/reset -> free transition according to the
2893 protocol specification (this works - the other way not only wasn't
2894 conformant, but also didn't work).
2896 - Add a control object in both client and server that allows either
2897 daemon to be shut down cleanly.
2899 - When writing a lease, if we run out of disk space, shut down the
2900 output file and insist on writing a new one before proceeding.
2902 - In the server, if the OMAPI listener port is occupied, keep trying
2903 to get it, rather than simply giving up and exiting.
2905 - Support fetching variables from leases and also updating and adding
2906 variables to leases via OMAPI.
2908 - If two failover peers have wildly different clocks, refuse to start
2911 - Fix a bug in the DNS update code that could cause core dumps when
2912 running on alpha processors.
2914 - Fixed a bug in ddns updates for static lease entries, thanks to a
2915 patch from Andrey M Linkevitch.
2917 - Add support for Darwin/MacOS X
2919 - Install omshell (including new documentation).
2921 - Support DNS updates in the client (this is a very obscure feature
2922 that most DHCP client users probably will not be able to use).
2924 - Somewhat cleaner status logging in the client.
2926 - Make OMAPI key naming syntax compatible with the way keys are
2927 actually named (key names are domain names).
2929 - Fix a bug in the lease file writer.
2931 - Install DHCP ISC headers in a different place than BIND 9 ISC
2932 headers, to avoid causing trouble in BIND 9 builds.
2934 - Don't send updates for attributes on an object when the attributes
2935 haven't changed. Support deleting attributes on remote objects.
2937 - Fix a number of bugs in omshell, and add the unset and refresh
2940 - Handle disconnects in OMAPI a little bit more intelligently (so that
2941 the caller gets ECONNRESET instead of EINVAL).
2943 - Fix a bunch of bugs in the handling of clients that have existing
2944 leases when the try to renew their leases while failover is
2947 Changes since 3.0 Release Candidate 6
2949 - Fix a core dump that could happen when processing a DHCPREQUEST from
2950 a client that had a host declaration that contained both a
2951 fixed-address declaration and a dhcp-client-identifier option
2952 declaration, if the client identifier was longer than nine bytes.
2954 - Fix a memory leak that could happen in certain obscure cases when
2955 using omapi to manipulate leases.
2957 - Fix some bugs and omissions in omshell.
2959 Changes since 3.0 Release Candidate 5
2961 - Fix a bug in omapi_object_dereference that prevented objects in
2962 chains from having their reference counts decreased on dereference.
2964 - Fix a bug in omapi_object_dereference that would prevent object
2965 chains from being freed upon removal of the last reference external
2968 - Fix a number of other memory leaks in the OMAPI protocol subsystem.
2970 - Add code in the OMAPI protocol handler to trace memory leakage.
2972 - Clean up the memory allocation/reference history printer.
2974 - Support input of dotted quads and colon-separated hex lists as
2975 attribute values in omshell.
2977 - Fix a typo in the Linux interface discovery code.
2979 - Conditionalize a piece of trace code that wasn't conditional.
2981 Changes since 3.0 Release Candidate 4
2983 - Fix a bug that would prevent leases from being abandoned properly on
2986 - Fix failover peer OMAPI support.
2988 - In failover, correctly handle expiration of leases. Previously,
2989 leases would never be reclaimed because they couldn't make the
2990 transition from EXPIRED to FREE.
2992 - Fix some broken failover state transitions.
2994 - Documentation fixes.
2996 - Take out an unnecessary check in DHCP relay agent information option
2997 stashing code that was preventing REBINDING clients from rebinding.
2999 - Prevent failover peers from allocating leases in DHCPREQUEST
3000 processing if the lease belongs to the other server.
3002 - Record server version in lease file introductory comment.
3004 - Correctly report connection errors in OMAPI and failover.
3006 - Make authentication signature algorithm name comparisons in OMAPI
3009 - Fix compile problem on SunOS 4.x
3011 - If a signature algorithm is not terminated with '.', terminate it so
3012 that comparisons between fully-qualified names will work
3015 - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
3016 systems with the probe not working correctly.
3018 - Don't allow user to type omapi key on command line of omshell.
3020 Changes since 3.0 Release Candidate 3
3022 - Do lease billing on startup in a way that I *think* will finally do
3023 the billing correctly - the previous method could overbill as a
3024 result of duplicate leases.
3026 - Document OMAPI server objects.
3028 Changes since 3.0 Release Candidate 2 Patchlevel 1
3030 - Fix some problems in the DDNS update code. Thanks to Albert
3031 Herranz for figuring out the main problem.
3033 - Fix some reference counting errors on host entries that were causing
3036 - Fix a byte-swap bug in the token ring code, thanks to Jochen
3039 - Fix a bug in lease billing, thanks to Jonas Bulow.
3041 Changes since 3.0 Release Candidate 2
3043 - Change the conditions under which a DHCPRELEASE is actually
3044 committed to be consistent with lease binding states rather than
3045 using the lease end time. This may fix some problems with the
3048 - Fix a bug where lease updates would fail on Digital Unix (and maybe
3049 others) because malloc was called with a size of zero.
3051 - Fix a core dump that happens when the DHCP server can't create its
3054 Changes since 3.0 Release Candidate 1 Patchlevel 1
3056 - Fix the dhcp_failover_put_message to not attempt to allocate a
3057 zero-length buffer. Some versions of malloc() fail if you try to
3058 allocate a zero-length buffer, and this was causing problems on,
3061 - Fix a case where the failover code was printing an error message
3062 when no error had occurred.
3064 - Fix a problem where when a server went down and back up again, the
3065 peer would not see a state transition and so would stay in the
3066 non-communicating state.
3068 - Be smart about going into recover_wait.
3070 - Fix a problem in the failover implementation where peers would fail
3071 to come into sync if interrupted in the RECOVER state. This could
3072 have been the cause of some problems people have reported recently.
3074 - Fix a problem with billing classes where they would not be unbilled
3075 when the client lease expired.
3077 - If select fails, figure out which descriptor is bad, and cut it out
3078 of the I/O loop. This prevents a potentially nasty spin. I
3079 haven't heard any report it in a while, but it came up consistently
3082 - Fix a bug in the relay agent where if you specified interfaces on
3083 the command line, it would fail.
3085 - Fix a couple of small bugs in the omapi connection object (no known
3088 - Add the missing 3.0 Beta 1 lease conversion script.
3090 - Read dhcp client script hooks if they exist, rather than only if
3093 Changes since 3.0 Release Candidate 1
3095 - Fix a memory smash that happens when fixed-address leases are used.
3096 ANY SITE AT WHICH FIXED-ADDRESS STATEMENTS ARE BEING USED SHOULD
3097 UPGRADE IMMEDIATELY. This has been a long-standing bug - thanks to
3098 Alvise Nobile for discovering it and helping me to find it!
3100 - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
3103 - There is a known problem with the DHCP server doing failover on
3104 Compaq Alpha systems. This patchlevel is not a release candidate
3105 because of this bug. The bug should be straightforward to fix, so
3106 a new release candidate is expected shortly.
3108 - There is a known problem in the DDNS update code that is probably a
3109 bug, and is not, as far as we know, fixed in this patchlevel.
3111 Changes since 3.0 Beta 2 Patchlevel 24
3113 - Went over problematic failover state transitions and made them all
3114 work, so that failover should now much less fragile.
3116 - Add some dhcpctl and omapi documentation
3118 - Fix compile errors when compiling with unusual predefines.
3120 - Make Token Ring work on Linux 2.4
3122 - Fix the Digital Unix BPF_WORDALIGN bug.
3124 - Fix some dhcp client documentation errors.
3126 - Update some parts of the README file.
3128 - Support GCC on SCO.
3130 Changes since 3.0 Beta 2 Patchlevel 23
3132 - Fix a bug in the DNS update code where a status code was not being
3133 checked. This may have been causing core dumps.
3135 - When parsing the lease file, if a lease declaration includes a
3136 billing class statement, and the lease already has a billing class,
3137 unbill the old class.
3139 - When processing failover transactions, where acks will be deferred,
3140 process the state transition immediately.
3142 - Don't try to use the new SIOCGIFCONF buffer size detection code on
3143 Linux 2.0, which doesn't provide this functionality.
3145 - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
3147 - Fix a problem in using the which command in the configure script.
3149 - Fix a parse error in the client when setting up an omapi listener.
3151 - Document the -n and -g flags to the client.
3153 - Make sure there is always a stdin and stdout on startup. This
3154 prevents shell scripts from accidentally writing error messages into
3155 configuration files that happen to be opened as stderr.
3157 - If an interface is removed, the client will now notice that it is
3158 gone rather than spinning. This has only been tested on NetBSD.
3160 - The client will attempt to get an address even if it can't create a
3163 - Don't overwrite tracefiles.
3165 - Fix some memory allocation bugs in failover.
3167 Changes since 3.0 Beta 2 Patchlevel 22
3169 - Apply some patches suggested by Cyrille Lefevre, who is maintaining
3170 the FreeBSD ISC DHCP Distribution port.
3172 - Fix a core dump in DHCPRELEASE.
3174 Changes since 3.0 Beta 2 Patchlevel 21
3176 - This time for sure: fix the spin described in the changes for pl20.
3178 Changes since 3.0 Beta 2 Patchlevel 20
3180 - Fix a problem with Linux detecting large numbers of interfaces (Ben)
3182 - Fix a memory smash in the quotify code, which was introduced in
3185 - Actually fix the spin described in the changes for pl20. The
3186 previous fix only partially fixed the problem - enough to get it
3187 past the regression test.
3189 Changes since 3.0 Beta 2 Patchlevel 19
3191 - Fix a bug that could cause the server to abort if compiled with
3192 POINTER_DEBUG enabled.
3194 - Fix a bug that could cause the server to spin when responding to a
3197 - Apply Joost Mulders' suggested patches for DLPI on x86.
3199 - Support NUL characters in quoted strings.
3201 - Install unformatted man pages on SunOS.
3203 Changes since 3.0 Beta 2 Patchlevel 18
3205 - Allow the server to be placed in partner-down state using OMAPI.
3208 - Implement omshell, which can be used to do arbitrary things to the
3209 server (in theory). (Damien Neil)
3211 - Fix a case where if a client had two different leases the server could
3212 actually dereference the second one when it hadn't been referenced,
3213 leading to memory corruption and a core dump. (James Brister)
3215 - Fix a case where a client could request the address of another client's
3216 lease, but find_lease wouldn't detect that the other client had it, and
3217 would attempt to allocate it to the client, resulting in a lease conflict
3220 - Fix a case where a client with more than one client identifier could be
3221 given a lease where the hardware address was correct but the client
3222 identifier was not, resulting in a lease conflict message.
3224 - Fix a problem where the server could write out a colon-separated
3225 hex list as a value for a variable, which would then not parse.
3226 The fix is to always write strings as quoted strings, with any
3227 non-printable characters quoted as octal escape sequences. So
3228 a file written the old way still won't work, but new files written
3231 - Fix documentation for sending non-standard options.
3233 - Use unparsable names for unknown options. WARNING: this will
3234 break any configuration files that use the option-nnn convention.
3235 If you want to continue to use this convention for some options,
3236 please be sure to write a definition, like this:
3238 option option-nnn code nnn = string;
3240 You can use a descriptive name instead of option-nnn if you like.
3242 - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
3243 DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
3244 result of a deceptively silly bug in supersede_lease.
3246 - Fix client script exit status check, according to a fix supplied by
3249 - Fix an endianness bug in the tracefile support, regarding ICMP
3252 - Fix a bug in the client where the medium would not work correctly if
3253 it contained quoted strings.
3255 ** there was no pl17 **
3257 Changes since 3.0 Beta 2 Patchlevel 16
3259 - Add support for transaction tracing. This allows the state of the
3260 DHCP server on startup, and all the subsequent transactions, to be
3261 recorded in a file which can then be played back to reproduce the
3262 behaviour of the DHCP server. This can be used to quickly
3263 reproduce bugs that cause core dumps or corruption, and also for
3264 tracking down memory leaks.
3266 - Incorporate some bug fixes provided by Joost Mulders for the DLPI
3267 package which should clear up problems people have been seeing on
3270 - Fix bugs in the handling of options stored as linked lists (agent
3271 options, fqdn options and nwip options) that could cause memory
3272 corruption and core dumps.
3274 - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
3275 not being send in some cases when they were needed.
3277 - Make the lease structure somewhat more compact.
3279 - Make initial failover startup *much* faster. This was researched
3280 and implemented by Damien Neil.
3282 - Add a --version flag to all executables, which prints the program
3283 name and version to standard output.
3285 - Don't rewrite the lease file every thousand leases.
3287 - A bug in nit.c for older SunOS machines was fixed by a patch sent in
3288 by Takeshi Hagiwara.
3290 - Fix a memory corruption bug in the DHCP client.
3292 - Lots of documentation updates.
3294 - Add a feature allowing environment variables to be passed to the
3295 DHCP client script on the DHCP client command line.
3297 - Fix client medium support, which had been broken for some time.
3299 - Fix a bug in the DHCP client initial startup backoff interval, which
3300 would cause two DHCPDISCOVERS to be sent back-to-back on startup.
3302 Changes since 3.0 Beta 2 Patchlevel 15
3304 - Some documentation tweaks.
3306 - Maybe fix a problem in the DLPI code.
3308 - Fix some error code space inconsistencies in ddns update code.
3310 - Support relay agents that intercept unicast DHCP messages to stuff
3311 agent options into them.
3313 - Fix a small memory leak in the relay agent option support code.
3315 - Fix a core dump that would occur if a packet was sent with no
3318 Changes since 3.0 Beta 2 Patchlevel 14
3320 - Finish fixing a long-standing bug in the agent options code. This
3321 was causing core dumps and failing to operate correctly - in
3322 particular, agent option stashing wasn't working. Agent option
3323 stashing should now be working, meaning that agent options can be
3324 used in class statements to control address allocation.
3326 - Fix up documentation.
3328 - Fix a couple of small memory leaks that would have added up
3329 significantly in a high-demand situation.
3331 - Add a log-facility configuration parameter.
3333 - Fix a compile error on some older operating systems.
3335 - Add the ability in the client to execute certain statements before
3336 transmitting packets to the server. Handy for debugging; not much
3337 practical use otherwise.
3339 - Don't send faked-out giaddr when renewing or bound - again, useful
3342 Changes since 3.0 Beta 2 Patchlevel 13
3344 - Fixed a problem where the fqdn decoder would sometimes try to store
3345 an option with an (unsigned) negative length, resulting in a core
3346 dump on some systems.
3348 - Work around the Win98 DHCP client, which NUL-terminates the FQDN
3351 - Work around Win98 and Win2k clients that will claim they want to do
3352 the update even when they don't have any way to do it.
3354 - Fix some log messages that can be printed when failover is operating
3355 that were not printing enough information.
3357 - It was possible for a DHCPDISCOVER to get an allocation even when
3358 the state machine said the server shouldn't be responding.
3360 - Don't load balance DHCPREQUESTs from clients in RENEWING and
3361 REBINDING, since in RENEWING, if we heard it, it's for us, and in
3362 REBINDING, the client wouldn't have got to REBINDING if its primary
3365 - When we get a bogus state lease binding state transition, don't do
3369 Changes since 3.0 Beta 2 Patchlevel 12
3371 - Fixed a couple of silly compile errors.
3373 Changes since 3.0 Beta 2 Patchlevel 11
3375 - Albert Herranz tracked down and fixed a subtle bug in the base64
3376 decoder that would prevent any key with an 'x' in its base64
3377 representation from working correctly.
3379 - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
3380 hang that they both spotted in the DHCP server - when
3381 one-lease-per-client was set, the code to release the "other" lease
3384 - Fix a problem with alignment of the input buffer in bpf in cases
3385 where two packets arrive in the same bpf read.
3387 - Fix a problem where the relay agent would crash if you specified an
3388 interface name on the command line.
3390 - Add the ability to conditionalize client behaviour based on the
3393 - Add support for the FQDN option, and added support for a new way of
3394 doing ddns updates (ddns update style interim) that allows more than
3395 one DHCP server to update the DNS for the same network(s). This
3396 was implemented by Damien Neil with some additional functionality
3399 - Damien added a "log" statement, so that the configuration file can
3400 be made to log debugging information and other information.
3402 - Fixed a bug that caused option buffers not to be terminated with an
3405 - Fixed a long-standing bug in the support for option spaces where the
3406 options are stored as an ordered list rather than in a hash table,
3407 which could theoretically result in memory pool corruption.
3409 - Prevent hardware declarations with no actual hardware address from
3410 being written as something unparsable, and behave correctly in the
3411 face of a null hardware address on input.
3413 - Allow key names to be FQDNs, and qualify the algorithm name if it is
3414 specified unqualified.
3416 - Modify the DDNS update code so that it never prints the "resolver
3417 failed" message, but instead says *why* the resolver failed.
3419 - Officially support the subnet selection option, which now has an
3422 - Fix a build bug on MacOS X.
3424 - Allow administrator to disable ping checking.
3426 - Clean up dhcpd.conf documentation and add more information about how
3429 Changes since 3.0 Beta 2 Patchlevel 10
3431 - Fix a bug introduced during debugging (!) and accidentally committed
3434 Changes since 3.0 Beta 2 Patchlevel 9
3436 - Fix DHCP client handling of vendor encapsulated options.
3438 - Fix a bug in the handling of relay agent information options introduced
3441 - Stash agent options on client leases by default, and use the stashed
3442 options at renewal time.
3444 - Add the ability to test the client's binding state in the client
3445 configuration language.
3447 - Fix a core dump in the DNS update code.
3449 - Fix some expression evaluation bugs that were causing updates to be
3450 done when no client hostname was received.
3452 - Fix expression evaluation debugging printfs.
3454 - Teach pretty_print_option to print options in option spaces other than
3455 the DHCP option space.
3457 - Add a warning message if the RHS of a not is not boolean.
3459 - Never select for more than a day, because some implementations of
3460 select will just fail if the timeout is too long (!).
3462 - Fix a case where a DHCPDISCOVER from an unknown network would be
3465 - Fix a bug where if a client requested an IP address for which a different
3466 client had the lease, the DHCP server would reallocate it anyway.
3468 - Fix the DNS update code so that if the client changes its name, the DNS
3469 will be correctly updated.
3471 Changes since 3.0 Beta 2 Patchlevel 8
3473 - Oops, there was another subtle math error in the header-length
3476 Changes since 3.0 Beta 2 Patchlevel 7
3478 - Oops, forgot to byte-swap udp header length before bounds-checking it.
3480 Changes since 3.0 Beta 2 Patchlevel 6
3482 - Fix a possible DoS attack where a client could cause the checksummer
3483 to dump core. This was a read, not a write, so it shouldn't be
3484 possible to exploit it any further than that.
3486 - Implement client- and server-side support for using the Client FQDN
3489 - Support for other option spaces in the client has been added. This
3490 means that it is now possible to define a vendor option space on the
3491 client, request options in that space from the server (which must
3492 define the same option space), and then use those options in the
3493 client. This also allows NWIP and Client FQDN options to be used
3496 - Add object initializer support. This means that objects can now be
3497 initialized to something other than all-zeros when allocated, which
3498 makes, e.g., the interface object support code a little more robust.
3500 - Fix an off-by-one bug in the host stuffer. This was causing host
3501 deletes not the work, and may also have been causing OMAPI
3502 connections to get dropped. Thanks to James Brister for tracking
3505 - Fixed a core dump in the interface discovery code that is triggered
3506 when there is no subnet declaration for an interface, but the server
3507 decides to continue running. Thanks to Shane Kerr for tracking
3508 down and fixing this problem.
3510 Changes since 3.0 Beta 2 Patchlevel 5
3512 - Fix a bug in the recent enhancement to the interface discovery code
3513 to support arbitrary-length interface lists.
3515 - Support NUL-terminated DHCP options when initializing client-script
3518 - Fix suffix operator.
3520 - Fix NetWare/IP option parsing.
3522 - Better error/status checking in dhcpctl initialization and omapi
3525 - Fix a potential memory smash in dhcpctl code.
3527 - Fix SunOS4 and (maybe) Ultrix builds.
3529 - Fix a bug where a certain sort of incoming packet could cause a core
3530 dump on Solaris (and probably elsewhere).
3532 - Add some more safety checks in error logging code.
3534 - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
3536 - Fix relay agent so that if an interface is specified on the command
3537 line, the relay agent does not dump core.
3539 - Fix class matching so that match if can be combined with match or
3542 - Do not allow spurious leases in the lease database to introduce
3543 potentially bogus leases into the in-memory database.
3545 - Fix a byte-order problem in the client hardware address type code
3548 - Be slightly less picky about what sort of hardware addresses OMAPI
3549 can install in host declarations.
3551 Changes since 3.0 Beta 2 Patchlevel 4
3553 - Incorporated Peter Marschall's proposed change to array/record
3554 parsing, which allows things like the slp-agent option to be encoded
3555 correctly. Thanks very much to Peter for taking the initiative to
3556 do this, and for doing such a careful job of it (e.g., updating the
3559 - Added an encoding for the slp-agent option. :')
3561 - Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
3562 request for help on this with patches!
3564 - Incorporated a change that should fix a problem reported by Philippe
3565 Jumelle where when the network connection between two servers is
3566 lost, they never reconnect.
3568 - Fix client script files other than that for NetBSD to actually use
3569 make_resolv_conf as documented in the manual page.
3571 - Fix a bug in the packet handling code that could result in a core
3574 - Fix a bug in the bootp code where responses on the local net would
3575 be sent to the wrong MAC address. Thanks to Jerry Schave for
3578 Changes since 3.0 Beta 2 Patchlevel 3
3580 - In the DHCP client, execute client statements prior to using the values
3581 of options, so that the client configuration can overridden, e.g., the
3584 - Fix a reference counting error that would result in very reproducible
3585 failures in updates, as well as occasional core dumps, if a zone was
3586 declared without a key.
3588 - Fix some Linux 2.0 compilation problems.
3590 - Fix a bug in scope evaluation during execution of "on" statements that
3591 caused values not to be recorded on leases.
3593 - If the dhcp-max-message-size option is specified in scope, and the
3594 client didn't send this option, use the one specified in scope to
3595 determine the maximum size of the response.
3597 Changes since 3.0 Beta 2 Patchlevel 2
3599 - Fix a case where spawning subclasses were being allocated
3600 incorrectly, resulting in a core dump.
3602 - Fix a case where the DHCP server might inappropriately NAK a
3605 - Fix a place dhcprequest() where static leases could leak.
3607 - Include memory.h in omapip_p.h so that we don't get warnings about
3610 Changes since 3.0 Beta 2 Patchlevel 1
3612 - Notice when SIOCFIGCONF returns more data than fit in the buffer -
3613 allocate a larger buffer, and retry. Thanks to Greg Fausak for
3616 - In the server, if no interfaces were configured, report an error and
3619 - Don't ever record a state of 'startup'.
3621 - Don't try to evaluate the local failover binding address if none was
3622 specified. Thanks to Joseph Breu for finding this.