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
44 ! Add a check for a null pointer before calling the regexec function.
45 Without this check we could, under some circumstances, pass
46 a null pointer to the regexec function causing it to segfault.
47 Thanks to a report from BlueCat Networks.
51 ! Modify the DDNS handling code. In a previous patch we added logging
52 code to the DDNS handling. This code included a bug that caused it
53 to attempt to dereference a NULL pointer and eventually segfault.
54 While reviewing the code as we addressed this problem, we determined
55 that some of the updates to the lease structures would not work as
56 planned since the structures being updated were in the process of
57 being freed: these updates were removed. In addition we removed an
58 incorrect call to the DDNS removal function that could cause a failure
59 during the removal of DDNS information from the DNS server.
60 Thanks to Jasper Jongmans for reporting this issue.
64 - Fixed the code that checks if an address the server is planning
65 to hand out is in a reserved range. This would appear as
66 the server being out of addresses in pools with particular ranges.
71 - Fix the code that checks for an existing DDNS transaction to cancel
72 when removing DDNS information, so that we will continue with the
73 processing if we have a lease even if it doesn't have an outstanding
74 transaction. [ISC-Bugs #24682]
76 - Add AM_MAINTAINER_MODE to configure.ac to avoid rebuilding
77 configuration files. [ISC-Bugs #24107]
79 - Add support for passing DDNS information to a DNS server over
80 an IPv6 address. [ISC-Bugs #22647]
82 - Enhanced patch for 23595 to handle IPv4 fixed addresses more
83 cleanly. [ISC-Bugs #23595]
87 ! In dhclient check the data for some string options for
88 reasonableness before passing it along to the script that
89 interfaces with the OS.
93 - DHCPv6 server now responds properly if client asks for a prefix that
94 is already assigned to a different client. [ISC-Bugs #23948]
96 - Add the option "--no-pid" to the client, relay and server code,
97 to disable writing a pid file. Add the option "-pf pidfile"
98 to the relay to allow the user to supply the pidfile name at
99 runtime. Add the "with-relay6-pid-file" option to configure
100 to allow the user to supply the pidfile name for the relay
101 in v6 mode at configure time.
102 [ISC-Bugs #23351] [ISC-Bugs #17541]
104 - 'dhclient' no longer waits a random interval after first starting up to
105 begin in the INIT state. This conforms to RFC 2131, but elects not to
106 implement a 'SHOULD' direction in section 4.1. The goal of this change
107 is to start up faster. [ISC-Bugs #19660]
109 - Added 'initial-delay' parameter that specifies maximum amount of time
110 before client goes to the INIT state. The default value is 0. In previous
111 versions of the code client could wait up to 5 seconds. The old behavior
112 may be restored by using 'initial-delay 5;' in the client config file.
115 - ICMP ping-check should now sit closer to precisely the number of seconds
116 configured (or default 1), due to making use of the new microsecond
117 scale timer internally to dhcpd. This corrects a bug where the server
118 may immediately timeout an ICMP ping-check if it was made late in the
119 current second. [ISC-Bugs #19660]
121 - The DHCP client will schedule renewal and rebinding events in
122 microseconds if the DHCP server provided a lease-time that would result
123 in sub-1-second timers. This corrects a bug where a 2-second or lower
124 lease-time would cause the DHCP client to enter an infinite loop by
125 scheduling renewal at zero seconds. [ISC-Bugs #19660]
127 - Client lease records are recorded at most once every 15 seconds. This
128 keeps the client from filling the lease database disk quickly on very small
129 lease times. [ISC-Bugs #19660]
131 - To defend against RFC 2131 non-compliant DHCP servers which fail to
132 advertise a lease-time (either mangled, or zero in value) the DHCP
133 client now adds the server to the reject list ACL and returns to INIT
134 state to hopefully find an RFC 2131 compliant server (or retry in INIT
135 forever). [ISC-Bugs #19660]
137 - Parameters configured to evaluate from user defined function calls can
138 now be correctly written to dhcpd.leases (as on 'on events' or dynamic
139 host records inserted via OMAPI). [ISC-Bugs #22266]
141 - If a 'next-server' parameter is configured in a dynamic host record via
142 OMAPI as a domain name, the syntax written to disk is now correctly parsed
143 upon restart. [ISC-Bugs #22266]
145 - The DHCP server now responds to DHCPLEASEQUERY messages from agents using
146 IP addresses not covered by a subnet in configuration. Whether or not to
147 respond to such an agent is still governed by the 'allow leasequery;'
148 configuration parameter, in the case of an agent not covered by a configured
149 subnet the root configuration area is examined. Server now also returns
150 vendor-class-id option, if client sent it. [ISC-Bugs #21094]
152 - Documentation fixes
153 [ISC-Bugs #17959] add text to AIX section describing how to have it send
154 responses to the all-ones address.
155 [ISC-Bugs #19615] update the includes in dhcpctl/dhcpctl.3 to be more correct
156 [ISC-Bugs #20676] update dhcpd.conf.5 to include the RFC numbers for DDNS
158 - Relay no longer crashes, when DHCP packet is received over interface without
159 any IPv4 address assigned. Also extended logging message about discarding
160 packets with invalid hlen with information about relevant interface name.
163 - Relay now properly logs that packet was received over interface without
164 global IPv6 address [ISC-Bugs #24070]
166 - Linux Packet Filter interface improvement. sockaddr_pkt structure is used,
167 rather than sockaddr. Packet ethertype is now forced to ETH_P_IP.
170 - Minor code cleanups - but note port change for #23196
171 [ISC-Bugs #23470] - Modify when an ignore return macro is defined to
172 handle unsed error return warnings for more versions of gcc.
173 [ISC-Bugs #23196] - Modify the reply handling in the server code to
174 send to a specified port rather than to the source port for the incoming
175 message. Sending to the source port was test code that should have
176 been removed. The previous functionality may be restored by defining
177 REPLY_TO_SOURCE_PORT in the includes/site.h file. We suggest you don't
178 enable this except for testing purposes.
179 [ISC-Bugs #22695] - Close a file descriptor in an error path.
180 [ISC-Bugs #19368] - Tidy up variable types in validate_port.
182 - Code cleanup: remove obsolete PROTO, KandR, INLINE and ANSI_DECL macros
185 - Compilation problem with gcc4.5 and omshell.c resolved. [ISC-Bugs #23831]
187 - If a client renews before 'dhcp-cache-threshold' percent of its lease
188 has elapsed (default 25%), the server will reuse the allocated lease
189 (provide a lease within the currently allocated lease-time) rather
190 than extend or renew the lease. This absolves the server of needing
191 to perform an fsync() operation on the lease database before reply,
192 which improves performance. [ISC-Bugs #22228]
194 - Client Script fixes
195 [ISC-Bugs #23045] Typos in client/scripts/openbsd
196 [ISC-Bugs #23565] In the client scripts add a zone id (interface id) if
197 the domain search address is link local.
198 [ISC-Bugs #1277] In some of the client scripts add code to handle the
199 case of the default router information being changed without the address
202 - Documentation cleanup
203 [ISC-Bugs #23326] Updated References document, several man page updates
205 - Server no longer complains about NULL pointer when configured
206 server-identifier expression fails to evaluate. [ISC-Bugs #24547]
208 - Convert ISC_R_INPROGRESS status to ISC_R_SUCCESS when called from other
209 than the dispatch handler. This fixes an issue where omshell, when
210 run from the same platform as the server, would appear to fail to
211 connect. This is a companion to #21839. [ISC-Bugs #23592]
213 - Enlarge the buffer size used by the Omshell code and some of the
214 print routines to allow for greater than 60 characters or, when
215 printing as hex strings, 20 characters. [ISC-Bugs #22743]
217 - In Solaris 11 switch to using sockets instead of DLPI, thanks
218 to a patch form Oracle. [ISC-Bugs #24634].
220 - Strict checks for content of domain-name DHCPv4 option can now be
221 configured during compilation time. Even though RFC2132 does not allow
222 to store more than one domain in domain-name option, such behavior is
223 now enabled by default, but this may change some time in the future.
224 See ACCEPT_LIST_IN_DOMAIN_NAME define in includes/site.h.
227 - DNS Update fix. A misconfigured server could crash during DNS update
228 processing if the configuration included overlapping pools or
229 multiple fixed-address entries for a single address. This issue
230 affected both IPv4 and IPv6. The fix allows a server to detect such
231 conditions, provides the user with extra information and recommended
232 steps to fix the problem. If the user enables the appropriate option
233 in site.h then server will be terminated
236 ! Two packets were found that cause a server to halt. The code
237 has been updated to properly process or reject the packets as
238 appropriate. Thanks to David Zych at University of Illinois
239 for reporting this issue. [ISC-Bugs #24960]
240 One CVE number for each class of packet.
246 - Documentation cleanup covering multiple tickets
247 [ISC-Bugs #20265] [ISC-Bugs #20259] minor cleanup
248 [ISC-Bugs #20263] add text describing some default values
249 [ISC-Bugs #20193] single quotes at the start of a line indicate a control
250 line to nroff, escape them if we actually want a quote.
251 [ISC-Bugs #18916] sync the pointer to web pages amongst the different docs
253 - 'get-host-names true;' now also works even if 'use-host-decl-names true;'
254 was also configured. The nature of this repair also fixes another
255 error; the host-name supplied by a client is no longer overridden by a
256 reverse lookup of the lease address. Thanks to a patch from Wilco Baan
257 Hofman supplied to us by the Debian package maintenance team.
258 [ISC-Bugs #21691] {Debian Bug#509445}
260 - The .TH tag for the dhcp-options manpage was typo repaired
261 thanks to a report from jidanni and the Debian package maintenance
262 team. [ISC-Bugs #21676] {Debian Bug#563613}
264 - More documentation changes - primarily to put the options in the dhclient
265 and dhcpd man pages into the standard form. Thanks in part to a patch
266 from David Cantrell at Red Hat.
267 [ISC-Bugs #20264] and parts of [ISC-Bugs #17744] dhclient.8 changes
269 - Add code to clear the pointer to an object in an OMAPI handle when the
270 object is freed due to a dereference. [ISC-Bugs #21306]
272 - Fixed a bug that leaks host record references onto lease structures,
273 causing the server to apply configuration intended for one host to any
274 other innocent clients that come along later. [ISC-Bugs #22018]
277 [ISC-Bugs #19566] When trying to find the zone for a name for ddns allow
278 the name to be at the apex of the zone.
279 [ISC-Bugs #19617] Restrict length of interface name read from command line
280 in dhcpd - based on a patch from David Cantrell at Red Hat.
281 [ISC-Bugs #20039] Correct some error messages in dhcpd.c
282 [ISC-Bugs #20070] Better range check on values when creating a DHCID.
283 [ISC-Bugs #20198] Avoid writing past the end of the field when adding
284 overly long file or server names to a packet and add a log message
285 if the configuration supplied overly long names for these fields.
286 Thanks to Martin Pala.
287 [ISC-Bugs #21497] Add a little more randomness to rng seed in client
288 thanks to a patch from Jeremiah Jinno.
290 - Correct error handling in DLPI [ISC-Bugs #20378]
292 - Remove __sun__ and __hpux__ typedefs in osdep.h as they are now being
293 checked in configure. [ISC-Bugs #20443]
295 - Modify how the cmsg header is allocated the v6 send and received routines
296 to compile on more compilers. [ISC-Bugs #20524]
298 - When parsing a domain name free the memory for the name after we are
299 done with it. [ISC-Bugs #20824]
301 - Add an elapsed time option to the release message and refactor the
302 code to move most of the common code to a single routine.
305 - Two identical log messages for commit_leases() have been disambiguated.
308 - Parse date strings more properly - the code now handles semi-colons in
309 date strings correctly. Thanks to a patch from Jiri Popelka at Red Hat.
310 [ISC-Bugs #21501, #20598]
312 - Fixes to lease input and output.
313 [ISC-Bugs #20418] - Some systems don't support the "%s" argument to
314 strftime, paste together the same string using mktime instead.
315 [ISC-Bugs #19596] - When parsing iaid values accept printable
317 [ISC-Bugs #21585] - Always print time values in omshell as hex
318 instead of ascii if the values happen to be printable characters.
320 - Minor changes for scripts, configure.ac and Makefiles
321 [ISC-Bugs #19147] Use domain-search instead of domain-name in manual and
322 example conf file. Thanks to a patch from David Cantrell
324 [ISC-Bugs #19761] Restore address when doing a rebind in DHCPv6
325 [ISC-Bugs #19945] Properly close the quote on some arguments.
326 [ISC-Bugs #20952] Add 64 bit types to configure.ac
327 [ISC-Bugs #21308] Add "PATH=" to CLIENT_PATH envrionment variable
329 - Update the code to parse dhcpv6 lease files to accept a semi-colon at
330 the end of the max-life and preferred-life clauses. In order to be
331 backwards compatible with older lease files not finding a semi-colon
332 is also accepted. [ISC-Bugs #22303].
334 ! Handle a relay forward message with an unspecified address in the
335 link address field. Previously such a message would cause the
336 server to crash. Thanks to a report from John Gibbons. [ISC-Bugs #21992]
337 CERT: VU#102047 CVE: CVE-2010-3611
339 - ./configure on longer searches for -lcrypto to explicitly link against.
340 This fixes a bug where 'dhclient' would have shared library dependencies
341 on '/usr/lib'. [ISC-Bugs #21967]
343 - Handle pipe failures more gracefully. Some OSes pass a SIGPIPE
344 signal to a process and will kill the process if the signal isn't
345 caught. This patch adds code to turn off the SIGPIPE signal via
346 a setsockopt() call. The signal is already being ignored as part
347 of the ISC library. [ISC-Bugs #22269]
349 - Restore printing of values in omshell to the style pre 21585. For
350 21585 we changed the print routines to always display time values
351 as a hex list. This had a side effect of printing all data strings
352 as a hex list. We shall investigate other ways of displaying time
353 values more usefully. [ISC-Bugs #22626]
355 ! Fix the handling of connection requests on the failover port.
356 Previously a connection request from a source that wasn't
357 listed as a failover peer would cause the server to become
358 non-responsive. Thanks to a report from Brad Bendily, brad@bendily.com.
360 CERT: VU#159528 CVE: CVE-2010-3616
362 - Don't pass the ISC_R_INPROGRESS status to the omapi signal handlers.
363 Passing it through to the handlers caused the omshell program to fail
364 to connect to the server. [ISC-Bugs #21839]
366 - Fix the paranthesis in the code to process configuration statements
367 beginning with "auth". The previous arrangement caused
368 "auto-partner-down" to be processed incorrectly. [ISC-Bugs #21854]
370 - Limit the timeout period allowed in the dispatch code to 2^^32-1 seconds.
371 Thanks to a report from Jiri Popelka at Red Hat.
372 [ISC-Bugs #22033], [Red Hat Bug #628258]
374 - When processing the format flags for a given option consume the
375 flag indicating an optional value correctly. A symptom of this
376 bug was an infinite loop when trying to parse the slp-service-scope
377 option. Thanks to a patch from Marius Tomaschewski.
380 - Disable the use of kqueue in the ISC library. This avoids a problem
381 between the fork and socket code that caused the dhcpd process to
382 use all available cpu if the program daemonized itself.
385 ! When processing a request in the DHCPv6 server code that specifies
386 an address that is tagged as abandoned (meaning we received a
387 decline request for it previously) don't attempt to move it from
388 the inactive to active pool as doing so can result in the server
389 crashing on an assert failure. Also retag the lease as active
390 and reset its timeout value.
393 - Removed the restriction on using IPv6 addresses in IPv4 mode. This
394 allows IPv4 options which contain IPv6 addresses to be specified. For
395 example the 6rd option can be specified and used like this:
398 option 6rd code 212 = { integer 8, integer 8,
399 ip6-address, array of ip-address };
400 option 6rd 16 10 2001:: 1.2.3.4, 5.6.7.8;
402 - Handle some DDNS corner cases better. Maintain the DDNS transaction
403 information when updating a lease and cancel any existing transactions
404 when removing the ddns information.
407 - Some fixes for LDAP
408 [ISC-Bugs #21783] - Include lber library when building ldap
409 [ISC-Bugs #22888] - Enable the ldap code when buidling common
410 The above fixes are from Jiri Popelka at Red Hat.
412 - Modify the dlpi code to accept getmsg() returning a positive value.
415 Changes since 4.2.0b2
417 - Add declaration for variable in debug code in alloc.c. [ISC-Bugs #21472]
419 Changes since 4.2.0b1
421 - Prohibit including lease time information in a response to a DHCP INFORM.
424 ! Accept a client id of length 0 while hashing. Previously the server would
425 exit if it attempted to hash a zero length client id, providing attackers
426 with a simple denial of service attack. [ISC-Bugs #21253]
427 CERT: VU#541921 - CVE: CVE-2010-2156
429 - A memory leak in ddns processing was closed. [ISC-Bugs #21377]
431 - Modify the exception handling for initial context creation. Previously
432 we would try and clean up before exiting. This could present problems
433 when the cleanup required part of the context that wasn't available. It
434 also didn't do much as we exited afterwards anyway. Now we simply log
435 the error and exit. [ISC-Bugs #21093]
437 - A bug was fixed that could cause the DHCPv6 server to advertise/assign a
438 previously allocated (active) lease to a client that has changed subnets,
439 despite being on different shared networks. Dynamic prefixes specifically
440 allocated in shared networks also now are not offered if the client has
441 moved. [ISC-Bugs #21152]
443 - Add some debugging output for use with the DDNS code. [ISC-Bugs #20916]
445 - Fix the trace code to handle timing events better and to truncate a file
446 before using instead of overwriting it. [ISC-Bugs #20969]
448 - Modify the determination of the default TTL to use for DDNS updates.
449 The user may still configure the ttl via ddns-ttl. The default for
450 both v4 and v6 is now 1/2 the (preferred) lease time with a limit. The
451 previous defaults (1/2 lease time without a limit for v4 and a default
452 value for v6) may be used by defining USE_OLD_DDNS_TTL in site.h
455 - libisc/libdns is now brought up to version 9.7.1rc1. This corrects
456 three reported flaws in ISC DHCP;
458 o DHCP processes (dhcpd, dhclient) fail to start if one of either the
459 IPv4 or IPv6 address families is not present. [ISC-Bugs #21122]
461 o Assertion failure when attempting to cancel a previously running DDNS
462 update. [ISC-Bugs #21133]
464 o Compilation failure of libisc/libdns due to the use of a flexible
465 array member. [ISC-Bugs #21316]
467 Changes since 4.2.0a2
469 - Update the fsync code to work with the changes to the DDNS code. It now
470 uses a timer instead of noticing if there are no more packets to process.
472 - When constructing the DNS name structure from a text string append
473 the root to relative names. This satisfies a requirement in the DNS
474 library that names be absolute instead of relative and prevents DHCP
475 from crashing. [ISC-Bugs #21054]
477 - "The LDAP Patch" that has been circulating for some time, written by
478 Brian Masney and S.Kalyanasundraram and maintained for application to
479 the DHCP-4 sources by David Cantrell has been included. Please be
480 advised that these sources were contributed, and do not yet meet the
481 high standards we place on production sources we include by default.
482 As a result, the LDAP features are only included by using a compile-time
483 option which defaults off, and if you enable it you do so under your
484 own recognizance. We will be improving this software over time.
487 Changes since 4.2.0a1
489 - When using 'ignore client-updates;', the FQDN returned to the client
490 is no longer truncated to one octet.
492 - Cleaned up an unused hardware address variable in nak_lease().
494 - Manpage entries for the ia-pd and ia-prefix options were updated to
495 reflect support for prefix delegation.
497 - Cleaned up some compiler warnings
499 - An optimization described in the failover protocol draft is now included,
500 which permits a DHCP server operating in communications-interrupted state
501 to 'rewind' a lease to the state most recently transmitted to its peer,
502 greatly increasing a server's endurance in communications-interrupted.
503 This is supported using a new 'rewind state' record on the dhcpd.leases
504 entry for each lease.
506 - Fix the trace code which was broken by the changes to the DDNS code.
508 Changes since 4.1.0 (new features)
510 - Failover port configuration can now be left to defaults (port 647) as
511 described in the -12 revision of the Failover draft (and assigned by
512 IANA). Thanks in part to a patch from David Cantrell at Red Hat.
514 - If configured, dhclient may now transmit to an anycast MAC address,
515 rather than using a broadcast address. Thanks to a patch from David
518 - Added client support for setting interface MTU and metric, thanks to
519 Roy "UberLord" Marples <roy@marples.name>.
521 - Added client -D option to specify DUID type to send.
523 - A new failover configuration parameter has been introduced for those
524 environments where DHCP servers can be reasonably guaranteed to be
525 "down" when the failover TCP socket is severed, "auto-partner-down".
526 This parameter is not generally safe, and by default is disabled, so
527 please carefully review the documentation of this parameter in the
528 dhcpd.conf(5) manpage before determining to use it yourself.
530 - Added a configuration function, 'gethostname()', which calls the system
531 function of the same name and presents the results as a data expression.
532 This function can be used to incorporate the system level hostname of
533 the system the DHCP software is operating on in responses or queries (such
534 as including a failover partner's hostname in a dhcp message or binding
535 scope, or having a DHCP client send any system hostname in the host-name or
536 FQDN options by default).
538 - The dhcp-renewal-time and dhcp-rebinding-time options may now be configured
539 for DHCPv4 operation and used independently of the dhcp-lease-time
540 calculations. Invalid renew and rebinding times (e.g., greater than the
541 determined lease time) are omitted.
543 - Processing the DHCP to DNS server transactions in an asyncrhonous fashion.
544 The DHCP server or client can now continue with its processing while
545 awaiting replies from the DNS server.
547 - The 'hardware [ethernet|etc] ...;' parameter in host records has been
548 extended to attempt to match DHCPv6 clients by the last octets of a
549 DUID-LL or DUID-LLT provided by the client.
551 Changes since 4.1.0 (bug fixes)
553 - Remove infinite loop in token_print_indent_concat().
555 - Validate the argument to the -p option.
557 - The notorious 'option <unknown> ... larger than buffer' log line,
558 which is seen in some malformed DHCP client packets, was modified.
559 It now logs the universe name, and does not log the length values
560 (which are bogus corruption read from the packet anyway). It also
561 carries a hopefully more useful explanation.
563 - Suppress spurious warnings from configure about --datarootdir
565 - A bug was fixed that caused the server not to answer some valid Solicit
566 and Request packets, if the dynamic range covering any requested addresses
567 had been deleted from configuration.
569 - Update the code to deal with GCC 4.3. This included two sets of changes.
570 The first is to the configuration files to include the use of
571 AC_USE_SYSTEM_EXTENSIONS. The second is to deal with return values that
574 - The db-time-format option was documented in manpages.
576 - Using reserved leases no longer results in 'lease with binding state
577 free not on its queue' error messages, thanks to a patch from Frode
580 - Fix a build error in dhcrelay, using older versions of gcc with
583 - Two uninitialized stack structures are now memset to zero, thanks to a
584 patch from David Cantrell at Red Hat.
586 - Fixed a cosmetic bug where pretty-printing valid domain-search options would
587 result in an erroneous error log message ('garbage in format string').
589 - A bug in DLPI packet transmission (Solaris, HP/UX) that caused the server
590 to stop receiving packets is fixed. The same fix also means that the MAC
591 address will no longer appear 'bogus' on DLPI-based systems.
593 - A bug in select handling was discovered where the results of one select()
594 call were discarded, causing the server to process the next select() call
595 and use more system calls than required. This has been repaired - the
596 sockets will be handled after the first return from select(), resulting in
599 - The update-conflict-detection feature would leave an FQDN updated without
600 a DHCID (still currently implemented as a TXT RR). This would cause later
601 expiration or release events to fail to remove the domain name. The feature
602 now also inserts the client's up to date DHCID record, so records may safely
603 be removed at expiration or release time. Thanks to a patch submitted by
606 - Memory leak in the load_balance_mine() function is fixed. This would
607 leak ~20-30 octets per DHCPDISCOVER packet while failover was in use
610 - Various compilation fixes have been included for the memory related
611 DEBUG #defines in includes/site.h.
613 - Fixed Linux client script 'unary operator expected' errors with DHCPv6.
615 - Fixed setting hostname in Linux hosts that require hostname argument
616 to be double-quoted. Also allow server-provided hostname to
617 override hostnames 'localhost' and '(none)'.
619 - Fixed failover reconnection retry code to continue to retry to reconnect
620 rather than restarting the listener.
622 - Compilation on Solaris with USE_SOCKETS defined in includes/site.h has
623 been repaired. Other USE_ overrides should work better.
625 - A check for the local flavor of IFNAMSIZ had a broken 'else' condition,
626 that probably still resulted in the correct behaviour (but wouldn't use
627 a larger defined value provided by the host OS).
629 - Fixed a bug where an OMAPI socket disconnection message would not result
630 in scheduling a failover reconnection, if the link had not negotiated a
631 failover connect yet (e.g.: connection refused, asynch socket connect()
634 - A bug was fixed that caused the 'conflict-done' state to fail to be parsed
635 in failover state records.
637 ! A stack overflow vulnerability was fixed in dhclient that could allow
638 remote attackers to execute arbitrary commands as root on the system,
639 or simply terminate the client, by providing an over-long subnet-mask
640 option. CERT VU#410676 - CVE-2009-0692
642 - Fixed a bug where relay agent options would never be returned when
643 processing a DHCPINFORM.
645 - Versions 3.0.x syntax with multiple name->code option definitions is now
646 supported. Note that, similarly to 3.0.x, for by-code lookups only the
647 last option definition is used.
649 - Fixed a bug where a time difference of greater than 60 seconds between a
650 failover pair could cause the primary to crash on contact with the
651 secondary. Thanks to a patch from Steinar Haug.
653 - Don't look for IPv6 interfaces on Linux when running in DHCPv4 mode.
654 Thanks to patches from Matthew Newton and David Cantrell.
656 - Secondary servers in a failover pair will now perform ddns removals if
657 they had performed ddns updates on a lease that is expiring, or was
658 released through the primary. As part of the same fix, stale binding scopes
659 will now be removed if a change in identity of a lease's active client is
660 detected, rather than simply if a lease is noticed to have expired (which it
661 may have expired without a failover server noticing in some situations).
663 - A patch supplied by David Cantrell at RedHat was applied that detects
664 invalid calling parameters given to the ns_name_ntop() function.
665 Specifically, it detects if the caller passed a pointer and size pair
666 that causes the pointer to integer-wrap past zero.
668 ! Fixed a fenceposting bug when a client had two host records configured,
669 one using 'uid' and the other using 'hardware ethernet'. CVE-2009-1892
671 - Fixed the check in the dhcp_interface_signal_handler routine to verify
672 the existence of the linked signal handler before calling it.
674 - Both host and subnet6 configuration groups are now included whether a
675 fixed-address6 (DHCPv6) is in use or not. Host scoped configuration takes
676 precedence. This fixes two bugs, one where host scoped configuration
677 would not be included from a non-fixed-address6 host record, and the equal
678 and opposite bug where subnet6 scoped configuration would not be used when
679 over-riding values were not present in a matching fixed-address6 host
682 - ./configure now checks to ensure the intX_t and u_intX_t types are defined,
683 correcting a compilation failure when using Sun's compiler.
685 - Modified the handling of a connection to avoid releasing the omapi io
686 object for the connection while it is still in use. One symptom from
687 this error was a segfault when a failover secondary attempted to connect
688 to the failover primary if their clocks were not synchronized.
690 - Clean up to allow compilation with gcc 2.95.4 on FreeBSD. Remove an
691 extra semi-colon from common/dns.c and moved setting a variable to NULL
692 in server/dhcpv6.c to allow the compiler to decide that the variable
693 was always properly set.
695 Changes since 4.1.0b1
697 - A missing "else" in dhcrelay.c could have caused an interface not to
700 Changes since 4.1.0a2
702 - A cosmetic bug in DHCPDECLINE processing was fixed which caused all
703 successful DHCPDECLINEs to be logged as "not found" rather than
706 - Added configuration file examples for DHCPv6.
708 - Some failover debugging #defines have been better defined and some
709 high frequency messages moved to a deeper debugging symbol.
711 - The CLTT parameter in failover is now only updated by client activity,
712 and not by failover binding updates (taking on the peer's CLTT).
714 - Failover BNDUPD messages are now discarded if they conflict with an
715 update that has been transmitted, but not acknowledged.
717 - A bug cleaning up unknown-xxx temporary option definitions was fixed.
719 - Delayed-ack is now a compile-time option, compiled out by default.
720 This feature is simply too experimental for right now, and causes
721 some problems to some failover installations. We will revisit this
724 - The !inet_pton() call in res_mkupdrec was adjusted to '<= 0' as
725 inet_pton returns either 1, 0, or -1.
727 - A dhclient-script for MacOS X has been included, which enables
728 'dhclient -6' support.
730 - DDNS removal routines were updated so that the DHCID is not removed until
731 the client has been deprived of all A and AAAA records (not only the last
732 one of either of those). This resolves a bug where dual stack clients
733 would not be able to regain their names after either expiration event.
735 Changes since 4.1.0a1
737 - Corrected list of failover state values in dhcpd man page.
739 - Fixed a bug that caused some request types to be logged incorrectly.
741 - Clients that sent a parameter request list containing the
742 routers option before the subnet mask option were receiving
743 only the latter. Fixed.
745 - The server wasn't always sending the FQDN option when it should.
747 - A partner-down failover server no longer emits 'peer holds all free leases'
748 if it is able to newly-allocate one of the peer's leases.
750 - Fixed a coredump when adding a class via OMAPI.
752 - Check whether files are zero length before trying to parse them.
754 - Ari Edelkind's PARANOIA patch has been included and may be compiled in
755 via two ./configure parameters, --enable-paranoia and
756 --enable-early-chroot.
758 - ./configure was extended to cover many optional build features, such
759 as failover, server tracing, debugging, and the execute() command.
761 - There is now a default 1/4 of a second scheduled delay between delayed
762 fsync()'s, it can be configured by the max-ack-delay configuration
765 - A bug was fixed where the length of a hostname was miscalculated, so that
766 hosts were given odd-looking domain names ("foo.bar.ba.example.com").
768 - Shared network selection should be done from the innermost relay
769 valid link-address field, rather than the outermost.
771 - Prefix pools are attached to shared network scopes.
773 - Merged IA_XX related structures.
775 - Add DHCPv6 files in configure.
777 - A memory leak when using omapi has been fixed.
779 - DHCPv6 vendor-class options (VSIO) are now only sent when they appear
780 on the DHCPv6 ORO. This resolves a bug where VSIO options were placed
781 in IA_NA encapsulated options fields.
783 - Integrated client with stateless, temporary address and prefix delegation
786 - A double-dereference in dhclient transmission of DHCPDECLINEs was
789 - Fix handling of format code 'Z'.
791 - Support "-1" argument in DHCPv6.
793 - Merge DHCPv6-only "dhcrelay6" into general-purpose "dhcrelay" (use
794 "-6" option to select DHCPv6 mode).
796 - Fix handling of -A and -a flags in dhcrelay; it was failing to expand
797 packet size as needed to add relay agent options.
799 - A bug in subnet6 parsing where options contained in subnet6 clauses would
800 not be applied to clients addressed within that network was repaired.
802 - When configuring a "subnet {}" or "subnet6 {}" without an explicit
803 shared-network enclosing it, the DHCP software would synthesize a
804 shared-network to contain the subnet. However, all configuration
805 parameters within the subnet more intuitively belong "to any client
806 on that interface", or rather the synthesized shared-network. So,
807 when a shared-network is synthesized, it is used to contain the
808 configuration present inside the subnet {} clause. This means that
809 the configuration will be valid for all clients on that network, not
810 just those addressed out of the stated subnet. If you intended the
811 opposite, the workaround is to explicitly configure an empty
814 - A bug was fixed where Information-Request processing was not sourcing
815 configured option values.
817 - A warning was added since the DHCPv6 processing software does not yet
818 support class statements.
820 - Compliation warnings on GCC 4.3 relating to bootp source address
821 selection were repaired.
823 - The v6 BSD socket method was updated to use a single UDP BSD socket
824 no matter how many interfaces are involved, differentiating the
825 interfaces the packets were received on by the interface index supplied
828 - The relay agent no longer listens to the All DHCP Servers Multicast
831 - A bug was fixed in data_string_sprintfa() where va_start was only called
832 once for two invocations of vsprintf() variants.
834 - ERO (RFC 4994) server support.
836 - Basic and partial DHCPv6 leasequery support.
838 - Reliable DHCPv6 release (previous behavior, send release and exit, is
839 still available with dhclient -6 -1 -r).
841 Changes since 4.0.0 (new features)
843 - Added DHCPv6 rapid commit support.
845 - Added explicit parser support for zero-length DHCP options, such as
846 rapid-commit, via format code 'Z'.
848 - It's now possible to update the "ends" field of a lease with OMAPI.
849 This is useful if you want not only to release a lease, but also make
850 it available for reuse right away. Hat tip to Christof Chen.
852 - Fixed definition of the iaaddr hash functions to use the correct
853 functions when referencing and dereferencing memory.
855 - Some definitions not in phase with the IANA registry were updated.
857 - Allocated interface IDs are better controlled ('u' bit set to zero,
858 reserved IDs avoided).
860 - Unicast options are taken into account only for RENEWs.
862 - NoAddrsAvail answers to SOLICITs are always ADVERTISEs even when a SOLICIT
863 carries a rapid-commit option.
865 - Return in place of raise an impossible condition when one tries to release
866 an empty active lease.
868 - Timer granularity is now 1/100s in the DHCPv6 client.
870 - The dhclient-script was updated to create a host route for the default
871 gateway if the supplied subnet mask for an IPv4 address was a /32. This
872 allows the client to work in 'captive' network environments, where the
873 operator does not want clients to crosstalk directly.
875 - MINUS tokens should be parseable again.
877 - Multiple (up to "delayed-ack x;" maximum) DHCPv4 packets are now queued and
878 released in bursts after single fsync() events when the upper limit is
879 reached or if the receiving sockets go dry. The practical upshot is
880 that fsync-coupled server performance is now multiplicitively increased.
881 The default delayed ack limit is 28. Thanks entirely to a patch from
884 Changes since 4.0.0 (bug fixes)
886 - DHCP now builds on AIX.
888 - Exit with warning when DHCPv6-specific statements are used in the
889 config file but -6 is not specified.
891 - Fixed "--version" flag in dhcrelay
893 - The 'min-secs' configuration parameter's log message has been updated to
896 - The warning logged when an address range doesn't fit in the subnets
897 they were declared has been updated to be more helpful and identify the
898 typo in configuration that created the spanning addresses.
900 - A bug in failover pool rebalancing that caused POOLREQ message ping-pongs
903 - A flaw in failover pool rebalancing that could cause POOLREQ messages to
904 be sent outside of the min-balance/max-balance scheduled intervals has
907 - A cosmetic bug during potential-conflict recovery that caused the peer's
908 'conflict-done' state message to be logged as 'unknown-state' has been
909 repaired. It is now logged correctly.
911 - A bug was fixed where the 'giaddr' may be used to find the client's subnet
912 rather than its own 'ciaddr'.
914 - A log message was introduced to clarify the situation where a failover
915 'address' parameter (the server's local address) did not resolve to an
918 - The minimum site code value was set to 224 in 3.1.0 to track RFC3942. This
919 broke a lot of legacy site local configurations. The new code in place will
920 track site local space minimum option codes and logs a warning to encourage
921 updates and exploration of site local code migration problems. Option
922 codes less than 128 in site local spaces remain inaccessible.
924 - A possible relay agent option bug was repaired where random server
925 initialization state may have been used to signal the relay agent
926 information options sub-option code for the 'END' of the option space.
928 - Fixes to allow code to compile and run on Solaris 9.
930 - Fixes to allow code to compile on Mac OS X Leopard (10.5).
932 - When server is configured with options that it overrides, a warning is
933 issued when the configuration file is read, rather than at the time the
934 option is overridden. This was important, because the warning was given
935 every time the option was overridden, which could create a lot of
938 - Fixed a compilation problems on platforms that define a value for FDDI,
939 which conflicts with a dhcp configuration syntax token by the same name.
941 - When a failover server suspects it has encountered a peer running a
942 version 3.0.x failover server, a warning that the failover wire protocol
943 is incompatible is printed.
945 - The failover server no longer issues a floating point error if it encounters
946 a previously undefined option code.
948 - Fix startup error messages to report a missing "subnet6 declaration", rather
949 than a missing "subnet declaration", when running as a DHCPv6 server.
951 - DHCPv6 client timestamp in DUID was based on the year 1970 rather
954 - Warn when attempting to use a hardware parameter in DHCPv6.
956 - DHCPv6 released resources are now marked as released by the client.
958 - 'Soft' bindings have no more side-effects.
960 Changes since 4.0.0b3
962 - The reverse dns name for PTR updates on IPv6 addresses has been fixed to
963 use ip6.arpa. rather than default to in-addr.arpa and require user
966 - dhc6_lease_destroy() and dhc6_ia_destroy() now set lease and IA pointers
967 to NULL after freeing, to prevent subsequent accesses to freed memory.
969 - The DHCPv6 server would not send the preference option unless the
970 client requested it, via the ORO. This has been fixed, so the DHCPv6
971 server will always send the preference value if it is configured.
973 - When addresses were passed as hints to the server in an IA, they were
974 incorrectly handled, sometimes being treated as an error. Now the
975 server will treat these as hints and ignore them if it cannot supply
978 - If the client had multiple addresses, and one expired (was not renewed
979 by the server), the client would continue to attempt to renew the same
980 old address over and over. Now, the client will omit any expired
981 addresses from future Confirm, Renew, or Rebind messages.
983 - dhclient -6 will now select renew/rebind timers based upon the longest
984 address expiration time rather than the shortest expiration time, in
985 order to avoid cascading renewals in the event a server elects not to
986 extend one of multiple IAADDR leases.
988 - The server now limits clients that request multiple addresses to one
989 address per IA by default, which can be adjusted through the
990 "limit-addrs-per-ia" configuration option.
992 - The DHCPv6 client now issues fresh transaction IDs on Renew and Rebind
993 message exchanges, rather than using the most recent ID.
995 - The DHCPv6 server now replies to Information-Request messages.
997 - A bug was fixed in the dhclient-script for BSDs to correctly carry error
998 codes through some conditions.
1000 - The parsing of some options in the dhclient lease file, in particular
1001 the success DHCPv6 status-code, was fixed.
1003 - A bug was fixed that caused the DHCPv6 ORO option to be corrupted with
1004 seemingly random values.
1006 - A reference overleak in DHCPv6 shared network processing was repaired.
1008 - ./configure now autodetects local database locations rather than trying
1009 to put dhcpd.leases and dhclient.leases in /usr/local/var/db, which no
1012 - Regression fix for bug where server advertised a IPv6 address in
1013 response to a SOLICIT but would not return the address in response
1016 - A bug was fixed where the DHCPv6 server puts the NoAddrsAvail status
1017 code in the IA_NA was fixed. The status code now appears in the root
1020 Changes since 4.0.0b2
1022 - Clarified error message when lease limit exceeded
1024 - Relative time may now be used as a qualifier for 'allow' and 'deny' access
1025 control lists. These directives may be used to assist in re-addressing
1026 address pools without having to constantly reconfigure the server. Please
1027 see 'man dhcpd.conf' for more information on allow/deny 'after time' syntax.
1028 Thanks to a patch from Christof Chen.
1030 - The server will now include multiple IA_NA's and multiple IAADDRs within
1031 them, if advertised by the client. It still only seeks to allocate one
1034 Changes since 4.0.0b1
1036 - Use different paths for PID and lease files when running in DHCPv4
1037 or DHCPv6 mode, so that servers for both protcols can be run
1038 simultaneously on a single interface.
1040 - Fixed a buffer overflow error which could have allowed a denial
1041 of service under unusual server configurations
1043 - Eliminated a spurious error message from the client
1045 - A number of bugs with the internal handling of lease state on the
1046 server have been fixed. Some of these could cause server crashes.
1048 - The peer_wants_leases() changes pulled up from 3.1.0 were corrected,
1049 'never used' leases will no longer consistently shift between servers
1050 on every pool rebalance run.
1052 - sendmsg()/recvmsg() control buffers are now declared in such a way to
1053 ensure they are correctly aligned on all (esp. 64-bit) architectures.
1055 - The client leasing subsystem was streamlined and corrected to account
1056 more closely for changes in client link attachment selection.
1058 Changes since 4.0.0a3
1060 - The DHCP server no longer requires a "ddns-update-style" statement,
1061 and now defaults to "none", which means DNS updates are disabled.
1063 - Log messages when failover peer names mismatch have been improved to
1064 point out the problem.
1066 - Bug where server advertised a IPv6 address in response to a SOLICIT
1067 but would not return the address in response to a REQUEST. Thanks to
1068 Dennis Kou for finding the bug.
1070 - Fixed an error causing the server to lock up on lease expiration,
1071 reported independently by Jothilingam Vasu and Dennis Kou.
1073 - Fixed a ./configure bug where compile tests were failing due to
1074 "-Werror" (unused variable) rather than the actual test failure. Lead
1075 to inconsistent and unworkable auto-configurations.
1077 - Compilation with DLPI and -Werror has been repaired.
1079 - Error in decoding IA_NA option if multiple interfaces are present
1080 fixed by Marcus Goller.
1082 - DHCPv6 server Confirm message processing has been enhanced - it no
1083 longer replies only to clients with host {} records, it now replies
1084 as directed in RFC3315 section 18.2.2 - that is, to all clients
1085 regardless of the existence of bindings.
1087 - A core dump during expired lease cleanup has been repaired.
1089 - DDNS updates state information are now stored in 'binding scopes' that
1090 follow the leases through their lifecycles. This enables DDNS teardowns
1091 on leases that are assigned and expired inbetween a server restart (the
1092 state is recovered from dhcpd.leases). Arbitrary user-specified binding
1093 scopes ('set var = "value";') are not yet supported.
1095 - Additional compilation problems on HP/UX have been repaired.
1097 Changes since 4.0.0a2
1099 - Fix for startup where there are no IPv4 addresses on an interface.
1100 Thanks to Marcus Goller for reporting the bug.
1102 - Fixed file descriptor leak on listen failure. Thanks to Tom Clark.
1104 - Bug in server configuration parser caused server to get stuck on
1105 startup for certain bad pool declarations. Thanks to Guillaume
1106 Knispel for the bug report and fix.
1108 - Code cleaned to remove warnings reported by "gcc -Wall".
1110 - DHCPv6 is now the default. You can disable DHCPv6 support using the
1111 "--disable-dhcpv6" flag when you run the configure script.
1113 - An internal database inconsistency bug was repaired where the server
1114 would segfault if a client attempted to renew a lease that had been
1115 loaded from persistent storage.
1117 - 'request' and 'also request' syntaxes have been added to accommodate
1118 the DHCPv6 client configuration. 'send dhcp6.oro' is no longer
1121 - Bug fixed where configuration file parsing did not work with
1122 zero-length options; this made it impossible to set the
1123 rapid-commit option.
1125 - Bogus messages about host records with IPv4 fixed-addresses being of
1126 non-128-bits in length were removed.
1128 Changes since 4.0.0a1
1130 - Bug in octal parsing fixed. Thanks to Bernd Fuhrmann for the report
1133 - Autoconf now supplies proper flags for Solaris DHCPv6 builds.
1135 - Fix for parsing error on some IPv6 addresses.
1137 - Invalid CIDR representation for IPv6 subnets or ranges now checked
1138 for when loading configuration.
1140 - Compilation on HP/UX has been repaired. The changes should generally
1141 apply to any architecture that supplies SIOCGLIFCONF but does not
1142 use 'struct lifconf' structures to pass values.
1144 - Two new operators, ~= and ~~, have been integrated to implement
1145 boolean matches by regular expression (such as may be used in
1146 class matching statements). Thanks to a patch by Alexandr S.
1147 Agranovsky, which underwent slight modification.
1149 - Fix for icmp packets on 64-bit systems (bug introduced in 4.0).
1151 - A bug was fixed in interface discovery wherein an error identifying
1152 a server-configured interface with no IPv4 addresses would SEGV.
1154 - Fixed a bug in which write_lease() might report a failure incorrectly
1156 - Added support for DHCPv6 Release messages
1158 - Added -x option to dhclient, which triggers dhclient processes
1159 to exit gracefully without releasing leases first
1161 - All binaries (client, server, relay) now change directories
1162 to / before going into daemon mode, so as not to hold $CWD open
1164 - Fixed a bug parsing DHCPv6 client-id's in host-identifier statements
1166 - Fixed a bug with the 'ddns-updates' boolean server configuration
1167 parameter, which caused the server to fail.
1169 Changes since 4.0.0-20070413
1171 - Old (expired) leases are now cleaned.
1173 - IPv6 subnets now have support for arbitrary allocation ranges via
1174 a new 'range6' configuration directive.
1176 - An obviated option code hash lookup to find D6O_CLIENTID was removed.
1178 - Corrected some situations where variables might be used without being
1181 - Silenced several other compiler warnings.
1183 - Include the more standard sys/uio.h rather than rely upon other
1184 header files to include it (fixes a BSD 4.2 compile failure).
1186 - Duplicate dhclient-script updates for DHCPv6 to all provided scripts.
1188 - DHCPv4 I/O methods that failed to sense hardware address were corrected.
1190 - DHCPv4 is now the default (as documented) rather than DHCPv6. The default
1191 was set to DHCPv6 to facilitate ease early development, and forgotten.
1193 - Corrected a segmentation violation in DHCPv4 socket processing.
1195 - dhclient will now fork() into the background once it binds to an
1196 IPv6 address, or immediately if the -n flag is supplied.
1198 - -q is now the default behaviour on dhclient, with -d or -v enabling
1199 non-quiet (stderr logging) mode.
1201 - Fix documentation of the domain-search atom (quoted, with commas).
1203 - Document DHCPv6 options presently in the default table.
1205 - Replaced ./configure shellscripting with GNU Autoconf.
1207 Changes since 3.1.0 (NEW FEATURES)
1209 - DHCPv6 Client and Server protocol support. Use '-6' to run the daemons
1210 as v6-only. Use '-4' to run the daemons as v4-only (default. There is
1211 no support currently for both.
1213 - Server support for multiple IA_NA options, containing at most one
1216 - Client support for one IA_NA option, containing any number of IAADDR
1219 - Server support for the DHCPv6 Information-request message.
1221 - Inappropriate unicast DHCPv6 messages sent to the server are now
1222 discarded, and this has rearchitected the IO system slightly.
1224 - The DHCPv6 server DUID defaults to type 1, is persistently stored in
1225 the leases database, and can be over-ridden (either completely, or by
1226 specifying type 1 or type 2).
1228 - The server only uses Rapid-Commit if it has been configured with the
1229 Rapid-Commit option and the client requests it.
1231 - DDNS support. We now update AAAA records in the same place we would
1232 update A records, if we have an IPv6 address. We also generate IP6.ARPA
1233 style names for PTR records if we're dealing with an IPv6 address. Both
1234 A and AAAA updates are done using the same 'fqdn.' virtual option space
1235 (although the DHCPv4 FQDN and DHCPv6 FQDN options are formatted
1236 differently, they both use the same code here).
1238 - The Linux dhclient-script attempts to set and remove assigned addresses,
1239 and to configure /etc/resolv.conf from nameserver and domain name
1240 configurations. It can be extended to configure other parameters.
1242 - Initial DHCPv6 lease support.
1244 - The IO system now tracks all local IP addresses, so that the DHCP
1245 applications (particularly the dhcrelay) can discern between what frames
1246 were transmitted to it, and what frames are being carried through it which
1247 it should not intercept.
1249 Changes since 3.1.0 (Maintenance)
1251 - A bug was repaired where MAC Address Affinity for virgin leases always
1252 mapped to the primary. Virgin leases now have an interleaved preference
1253 between primary and secondary.
1255 - A bug was repaired where MAC Address Affinity for clients with no client
1256 identifier was sometimes mishashed to the peer. Load balancing during
1257 runtime and pool rebalancing were opposing.
1259 - An assertion in lease counting relating to reserved leases was repaired.
1261 - The subnet-mask option inclusion now conforms with RFC2132 section 3.3;
1262 it will only appear prior to the routers option if it is present on the
1263 Parameter-Request-List. The subnet-mask option will also only be
1264 included by default (if it is not on the PRL) in response to DISCOVER
1265 or REQUEST messages.
1267 - The FQDN option is only supplied if the client supplied an FQDN option or
1268 if the FQDN option was explicitly requested on the PRL.
1270 - Dynamic BOOTP leases are now load balanced in failover.
1272 Changes since 3.1.0rc1
1274 - The parse warning that 'deny dyanmic bootp;' must be configured for
1275 failover protected subnets was removed.
1277 Changes since 3.1.0b2
1279 - Failover rebalance events no longer play ping pong with round errors
1280 (moving leases between free and back to backup where there are an
1281 odd number of leases).
1283 - The 'pool' log line has been split into two messages, one before the
1284 rebalance run, and one after.
1286 - Any queued BNDACKs are transmitted before transmitting new BNDUPDs.
1287 This enforces the correct sequence of events for the remote server
1288 processing these messages.
1290 Changes since 3.1.0b1
1292 - Fixed a bug that caused OMAPI clients to freeze when opening lease
1295 - A new server config option "fqdn-reply" specifies whether the server
1296 should send out option 81 (FQDN). Defaults to "on". If set to "off",
1297 the FQDN option is not sent, even if the client requested it. This is
1298 needed because some clients misbehave otherwise. Thanks to Christof Chen
1301 - Allow trace output files (-tf option) to be overwritten, rather than
1302 crashing dhcpd if the file already exists
1304 - A bug was fixed that caused dhcpd to segfault if a pool was declared
1305 outside the scope of a subnet in dhcpd.conf.
1307 - Some uninitialized values were repaired in dhcpleasequery.c that
1308 caused the server to abort.
1310 - A new server config option, 'do-reverse-updates', has been added
1311 which causes the server to abstain from performing updates on PTR
1312 records. Thanks to a patch from Christof Chen at Allianz.
1314 - A bug was repaired in subencapsulation support, where spaces separated
1315 by empty spaces would not get included.
1317 - A bug in dhclient was repaired which caused it to send parameter request
1318 lists of 55 bytes in length no matter how long the declared PRL was.
1320 - 'dhcp.c(3953): non-null pointer' has been repaired. This fixes a flaw
1321 wherein the DHCPv4 server may ignore a configured server-identifier.
1323 - A flaw in failover startup sequences was repaired that sometimes left
1324 the primary DHCP server's pool rebalance schedules unscheduled.
1326 - Corrected a flaw that broke encapsulated spaces included due to presence
1327 on the parameter request list.
1329 Changes since 3.1.0a3
1331 - Some spelling fixes.
1333 Changes since 3.1.0a2
1335 - A bug was fixed where attempting to permit leasequeries results in a
1336 fatal internal error, "Unable to find server option 49".
1338 - A bug was fixed in dhclient rendering the textual output form of the
1339 domain-search option syntax.
1341 Changes since 3.1.0a1
1343 - A bug in the FQDN universe that added FQDN codes to the NWIP universe's
1344 hash table was repaired.
1346 - The servers now try harder to transmit pending binding updates when
1347 entering normal state.
1349 - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
1350 requeues all pending updates. This should reduce the number of spurious
1351 'xid mismatch' log messages.
1353 - An option definition referencing leak was fixed, which resulted in early
1354 termination of dhclient upon the renewal event.
1356 - Some default hash table sizes were tweaked, some upwards, some downwards.
1357 3.1.0a1's tables resulted in a reduction in default server memory use.
1358 The new selected values provide more of a zero sum (increasing the size
1359 of tables likely to be populated, decreasing the size of tables unlikely).
1361 - Lease structures appear in three separate hashes: by IP address, by UID,
1362 and by hardware address. One type of table was used for all three, and
1363 improvements to IP address hashing were applied to all three (so UID and
1364 hardware addresses were treated like 4-byte integers). There are now two
1365 types of tables, and the uid/hw hashes use functions more appropriate
1368 - The max-lease-misbalance percentage no longer causes scheduled rebalance
1369 runs to be skipped: it still governs the schedule, but every scheduled
1370 run will attempt balance.
1372 - A segfault bug in recursive encapsulation support has been corrected.
1374 Changes since 3.0 (New Features)
1376 - A workaround for certain STSN servers that send a mangled domain-name
1377 option was introduced for dhclient. The client will now accept corrupted
1378 server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
1379 or NAK). The server will continue to not accept corrupt client packets.
1381 - Support for 'reserved' (pseudo-static) and BOOTP leases via failover
1384 - Support for adding, removing, and managing class and subclass statements
1387 - The failover implementation was updated to comply with revision 12 of
1390 - 'make install' now creates the initial zero-length dhcpd.leases file if
1391 one does not already exist on the system.
1393 - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
1395 - The Load Balance Algorithm was misimplemented. The current implementation
1398 - lcase() and ucase() configuration expressions have been added which adjust
1399 their arguments from upper to lower and lower to upper cases respectively.
1400 Thanks to a patch from Albert Herranz.
1402 - The dhclient 'reject ...;' statement, which rejects leases given by named
1403 server-identifiers, now permits address ranges to be specified in CIDR
1404 notation. Thanks to a patch from David Boyce.
1406 - The subnet-mask option is now supplied by default, but at lowest
1407 priority. This helps a small minority of clients that provide parameter
1408 request lists, but do not list the subnet-mask option because they were
1409 designed to interoperate with a server that behaves in this manner.
1411 - The FQDN option is similarly supplied even if it does not appear on the
1412 parameter request list, but not to the exclusion of options that do
1413 appear at the parameter request list. Up until now it had ultimate
1414 priority over the client's parameter request list.
1416 - Varying option space code and length bit widths (8/16/32) are now
1417 supported. This is a milestone in achieving RFC 3925 "VIVSO" and
1420 - A new common (server or client) option, 'db-time-format local;', has
1421 been added which prints the local time in /var/db/dhcpd.leases rather
1422 than UTC. Thanks to a patch from Ken Lalonde.
1424 - Some patches to improve DHCP Server startup speed from Andrew Matheson
1425 have been incorporated.
1427 - Failover pairs now implement 'MAC Affinity' on leases moving from the
1428 active to free states. Leases that belonged to the failover secondary
1429 are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
1430 If lease rebalancing must move leases, it tries first to move leases
1431 that belong to the peer in need.
1433 - The server no longer sends POOLREQ messages unless the pool is severely
1434 misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
1436 - Pool rebalance events no longer happen upon successfully allocating a
1437 lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
1438 min-balance and max-balance statements for more information.
1440 - The DHCP Relay Agent Information Option / Link Selection Sub-Option
1441 is now supported. (See RFC3527 for details).
1443 - A new DDNS related server option, update-conflict-detection, has been
1444 added. If this option is enabled, dhcpd will perform normal DHCID
1445 conflict resolution (the default). If this option is disabled, it will
1446 instead trust the assigned name implicitly (removing any other bindings
1447 on that name). This option has not been made available in dhclient.
1449 - In those cases where the DHCP software manufactures an IP header (to
1450 transmit via bpf, lpf, etc), the IP TTL the software selects has been
1451 increased from 16 to 128. This is intended to match Microsoft Windows
1452 DHCP Client behaviour, to increase compatibility.
1454 - 'ignore client-updates;' now has behaviour that is different from
1455 'deny client-updates;'. The client's request is not truly ignored,
1456 rather it is encouraged. Should this value be configured, the server
1457 updates DNS as though client-updates were set to 'deny'. That is, it
1458 enters into DNS whatever it is configured to do already, provided it is
1459 configured to. Then it sends a response to the client that lets the
1460 client believe it is performing client updates (which it will), probably
1461 for a different name. In essence, this lets the client do as it will,
1462 ignoring this aspect of their request.
1464 - Support for compressed 'domain name list' style DHCP option contents, and
1465 in particular the domain search option (#119) was added.
1467 - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
1468 LEASEQUERY lets you query the DHCP server for information about a lease,
1469 using either an IP address, MAC address, or client identifier. Thanks
1470 to a patch from Justin Haddad.
1472 - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
1473 ethernet mac address) on the SCO platform specifically without any strange
1474 ifconfig hacks. Many thanks go to the Kroger Co. for donating the
1475 hardware and funding the development.
1477 - A new common configuration executable statement, execute(), has been
1478 added. This permits dhcpd or dhclient to execute a named external
1479 program with command line arguments specified from other configuration
1480 language. Thanks to a patch written by Mattias Ronnblom, gotten to us
1483 - A new dhcp server option 'adaptive-lease-time-threshold' has been added
1484 which causes the server to substantially reduce lease-times if there are
1485 few (configured percentage) remaining leases. Thanks to a patch submitted
1488 - Encapsulated option spaces within encapsulated option spaces is now
1491 Changes since 3.0.6rc1
1493 - supersede_lease() now requeues leases in their respective hardware
1494 address hash bucket. This mirrors client identifier behaviour.
1498 - Assorted fixes for broken network devices: Packet length is now
1499 determined from the IP header length field to finally calculate the
1500 UDP payload length, because some NIC drivers return more data than
1501 they actually received.
1503 - UDP packets are now stored in aligned data structures.
1505 - A logic error in omapi interface code was repaired that might result in
1506 incorrectly indicating 'up' state when any flags were set, rather than
1507 specifically the INTERFACE_REQUESTED flag. Thanks to a patch from
1508 Jochen Voss which got to us via Andrew Pollock at Debian.
1510 - A reference leak on binding scopes set by ddns updates was repaired.
1512 - A memory leak in the minires_nsendsigned() function call was repaired.
1513 Effectively, this leaked ~176 bytes per DDNS update.
1515 - In the case where an "L2" DHCP Relay Agent (one that does not set giaddr)
1516 was directly attached to the same broadcast domain as the DHCP server,
1517 the RFC3046 relay agent information option was not being returned to the
1518 relay in the server's replies. This was fixed; the dhcp server no longer
1519 requires the giaddr to reply with relay agent information. Note that
1520 this also improves compatibility with L2 devices that "intercept" DHCP
1521 packets and expect relay agent information even in unicast (renewal)
1522 replies. Thanks to a patch from Pekka Silvonen.
1524 - A bug was fixed where the BOOTP header 'sname' field had a value, the
1525 copy written to persistent storage was actually the contents of the
1528 - A bug was fixed where the nwip virtual option space was referencing
1529 the fqdn option's virtual option space's option cache.
1531 - Timestamp parsing errors that indicated missing "minutes" fields rather
1532 than the actually missing "seconds" fields have been repaired thanks to
1533 a patch from Kevin Steves.
1535 - A grammar error in the dhclient.8 manpage was repaired thanks to a patch
1538 - Several spelling typos were repaired, and some cross-references to other
1539 relevant documents were included in the manpages, thanks to a patch
1540 by Andrew Pollock which got to us via Tomas Pospisek.
1542 - Some bugs were fixed in the 'emergency relay agent options hologram'
1543 which is used to retain relay agent option contents from when the
1544 client was in INIT or REBIND states. This should solve problems where
1545 relay agent options were not echoed from the server, even when giaddr
1548 - dhclient now closes its descriptor to dhclient.leases prior to executing
1549 dhclient-script. Thanks to a patch from Tomas Pospisek.
1551 - The server's "by client-id" and "by hardware address" hash table lists
1552 are now sorted according to the preference to re-allocate that lease to
1553 returning clients. This should eliminate pool starvation problems
1554 arising when "INIT" clients were given new leases rather than presently
1557 Changes since 3.0.5rc1
1559 - A bug was repaired in fixes to the dhclient, which sought to run the
1560 dhclient-script with the 'EXPIRE' state should it receive a NAK in
1561 response to a REQUEST. The client now iterates the PREINIT state
1562 after the EXPIRE state, so that interfaces that might be configured
1563 'down' can be brought back 'up' and initialized.
1565 - DHCPINFORM handling for clients that properly set ciaddr and come to the
1566 server via a relay aget has been repaired.
1570 - A warning that host statements declared within subnet or shared-network
1571 scopes are actually global has been added.
1573 - The default minimum lease time (if min-lease-time was not specified)
1574 was raised from 0 to 300. 0 is not thought to be sensible, and is
1575 known to be damaging.
1577 - Added additional fatal error sanity checks surrounding lease binding
1578 state count calculations (free/active counts used for failover pool
1581 - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
1582 misapplied to server values rather than client values. The server no longer
1583 advertises 8-byte lease-time options when on 64-bit platforms.
1585 - A bug where leases not in ACTIVE state would get billed to billed classes
1586 (classes with lease limitations) was fixed. Non-active leases OFFERed
1587 to clients are no longer billed (but billing is checked before offering).
1589 - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
1590 configuration option - the default configuration and results should be
1593 - If the dhclient were to receive a DHCPNAK while it was in the RENEW
1594 state (and consequently, had an active, 'bound' address and related
1595 configuration options), it would fail to 'tear down' this information
1596 before proceeding into INIT state. dhclient now iterates the dhclient-
1597 script with the 'EXPIRE' action to cause these teardowns prior to entering
1598 INIT state. Thanks to a patch from Chris Zimmerman.
1600 - The omapi.1 manpage had some formatting errors repaired thanks to a patch
1601 from Yoshihiko Sarumaru.
1603 - A few lines of code that were failover-specific were moved within
1604 #if defined() clauses so that compilation without failover could be
1607 - The log message emitted when the 'leased-address' value was not available
1608 in dhcpd.conf "executable statements" has been updated to be more helpful.
1609 Manpage information for this value has also been updated.
1611 - Abandoned or dissociated (err condition) leases now remove any related
1612 dynamic dns bindings. Thanks to a patch from Patrick Schoo.
1614 - Attempting to write a new lease file to replace a corrupt (due to
1615 encountering non-retryable errors during writing) lease file should
1616 no longer result in an infinite recursion.
1618 - Host declaration hardware addresses and client identifiers may only be
1619 configured once. dhcpd will now fail to load config files that specify
1620 multiple identifiers (previous versions would silently over-ride the
1621 value with the later configured value).
1623 - Several option codes that have been allocated since our last release
1624 have been named and documented.
1626 - Option names of the form "unknown-123" have been removed from the in-
1627 memory hash tables. In order to support options of these names that
1628 may appear in dhclient.leases or similar in previous versions, the
1629 parser will now find the new option code definition, or mock up a
1630 generic option code definition. This should result in a smooth
1631 transition from one name to the other, as the new name is used to
1634 Changes since 3.0.4rc1
1636 - The dhcp-options.5 manpage was updated to correct indentation errors
1637 thanks to a patch from Jean Delvare.
1639 Changes since 3.0.4b3
1641 - Some manual pages were clarified pursuant to discussion on the dhcp-server
1644 Changes since 3.0.4b2
1646 - Null-termination sensing for certain clients that unfortunately require
1647 it in DHCPINFORM processing was repaired.
1649 - The host-name option and a few others were moved from "X" format to "t"
1650 format to be compatible with new NULL handling functions.
1652 - DHCPINFORM processing is a little more careful about return addressing
1653 its responses, or if responding via a relay. The INFORM related
1654 messages also log the 'effective client ip address' rather than the
1655 client's supplied ciaddr (since some clients produce null ciaddrs).
1657 - The server was inappropriately sending leases to the RESET state in the
1658 event that multiple active leases were found to match a singly-identified
1659 client. This was changed to RELEASED (by accepting a different, ACTIVE
1660 binding, the client is implicitly releasing its lease). This repairs a
1661 bug wherein secondary servers in failover pairs detecting this condition
1662 move leases to RESET, and primaries refuse to accept that state
1663 transition (properly).
1665 - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
1667 Changes since 3.0.4b1
1669 - Command line parsing in omshell was repaired - it no longer closes
1670 STDIN after reading one line.
1672 - The resolver library no longer closes the /etc/resolv.conf file
1673 descriptor it opened twice.
1675 - Changes to trailing NULL removal in 't' option-atoms has been rethought,
1676 it now includes 'd' (domain name) types, and tries hard not to rewind an
1677 option beyond the start of the text field it is un-terminating.
1681 - A DDNS update handling function was misusing the DNS error codes, rather
1682 than the internal generic result enumeration. The result is a confusing
1683 syslog line, logging the wrong condition.
1685 - The DHCP Server was not checking pool balance in the case where it brought
1686 a non-ACTIVE lease out of storage for a client that was returning to use
1687 a lease it once had long ago, and had since expired.
1689 - Failover peers no longer bother to look for free leases to allocate when
1690 they already found the client's ACTIVE lease. DISCOVERs are load balanced
1691 whether freely-allocated or not, unless the server doubts the peer has
1694 - Fixed a bug in dhcrelay agent addition code that suppressed trailing
1695 PAD options - it was suppressing only one trailing PAD option, rather
1696 than the entire block of them.
1698 ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
1699 option addition and stripping code. Added a few sanity checks. Although
1700 highly improbable, due to requiring the reception of a DHCP datagram well
1701 in excess of all known to be used physical MTU limitations, it is possible
1702 this may have been used in a stack overflow security vulnerability. Thanks
1703 to a patch from infamous42md.
1705 ! Added some sanity checks to OMAPI connection/authentication code.
1706 Although highly improbable, due to having to deliver in excess of 2^32
1707 bytes of data via the OMAPI channel, not to mention requiring dhcpd to
1708 be able to malloc() a memory region 2^32 bytes in size, it was possible
1709 this might have resulted in a heap overflow security vulnerability.
1710 Thanks to a patch from infamous42md.
1712 - dmalloc() memset()'s the non-debug (data) portion of the allocated
1713 memory to zero. Code that memset()'s the result returned by dmalloc() to
1714 zero is redundant. These redundancies were removed.
1716 - Some type declaration corrections to u_int16_t were made in common/tr.c
1717 (Token Ring support) thanks to a patch from Jason Vas Dias at Red Hat.
1719 - A failover bug that was allowing leases that EXPIRED or were RELEASED
1720 where tsfp and tstp are identical timestamps to languish in these
1721 transitional states has been repaired. As a side effect, lease
1722 databases should be kept more consistent overall, not just for these
1723 transitional states.
1725 - If the lease db is deleted out from under the daemon, and it moves to rewrite
1726 the db, it will go ahead with the operation and move the new db into place
1727 once it detects the old db does not exist.
1729 - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
1730 is either nonsensical or (in the case of IEEE1394) is not known to support
1731 these interfaces. Thanks to Marius Gedminas and Andrew Pollock of Debian.
1733 - Some previously undocumented reasons for dhclient-script invoking has
1734 been documented in the dhclient-script.8 manpage.
1736 - Failover potential expiry calculations (TSTP) have been corrected. Results
1737 should be substantially more consistent, and proper given the constraints.
1739 - Adjusted lease state validation checks in potential-conflict, to
1740 account for possible clock skew similarly to normal state, and several
1741 previously illegal transitions were made legal (ex: active->released).
1743 - An impossible sanity check was removed from omapi/buffer.c, thanks to a
1744 patch from 'infamous42md'.
1746 - An OMAPI host/network byte order problem in lease time values has been
1749 - Several minor bugs, largely relating to treating 8-byte time values as
1750 4-byte entities, have been repaired after careful review of the FreeBSD
1751 ports collection's patch set. Thanks to the nameless entities who have
1752 contributed to the FreeBSD ports.
1754 - When writing a trace file, the file is now created with permissions 0600,
1755 to help administrators avoid accidentally publicising sensitive config
1758 - The calculation of the maximum size of DHCP packets no longer includes
1759 Ethernet framing overhead. The result is that the 'Maximum Message
1760 Size' option advertised by clients, or the default value 576, is no
1761 longer reduced by 14 bytes, and instead directly reflects the IP level
1762 MTU (and the default, minimum allowed IP MTU of 576).
1764 - The special status of RELEASED/EXPIRED/RESET leases when a server
1765 is operating in partner-down was fixed. It no longer requires a
1766 lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
1767 event to turn these into FREE leases without peer acknowledgement
1768 (after STOS+MCLT) has been repaired.
1770 - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
1773 - "append"ing a string onto the end of a "t" type option (such as the
1774 domain-name field) that had been improperly NULL-terminated by the
1775 DHCP server will no longer result in a truncated string containing
1776 only the option from the server, and not the expected appended value.
1777 Thanks to a patch from Jason Vas Dias at Red Hat.
1779 - File handlers on configuration state (config files and lease dbs) should
1780 be treated consistently, regardless of whether TRACING is defined or not.
1782 - The Linux build environment has had some minor improvements - better
1783 sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
1784 and corrections to #if operators regarding LINUX_MAJOR should it ever
1787 - The server now tries harder to survive the condition where it is unable
1788 to open a new lease file to rewrite the lease state database.
1790 Changes since 3.0.3b3
1792 - dhclient.conf documentation for interface {} was updated to reflect recent
1793 discussion on the dhcp-hackers mailing list.
1795 - In response to reports that the software does not compile on GCC 4.0.0,
1796 -Werror was removed from Makefile.conf for all platforms that used it.
1797 We will address the true problem in a future release; this is a temporary
1800 Changes since 3.0.3b2
1802 - An error in code changes introduced in 3.0.3b2 was corrected, which caused
1803 static BOOTP clients to receive random addresses.
1805 Changes since 3.0.3b1
1807 - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
1808 host records would be left behind on leases that were not allocated to the
1809 client currently booting (eg in the case where the host was denied booting).
1811 - The dhcpd.conf.5 manpage was updated to be more clear in regards to
1812 multiple host declarations (thanks to Vincent McIntyre). 'Interim' style
1813 dynamic updates were also retouched.
1817 - A bug was fixed where a server might load balance a DHCP REQUEST to its
1818 peer after already choosing not to load balance the preceding DISCOVER.
1819 The peer cannot allocate the originating server's lease.
1821 - In the case where a secondary server lost its stable storage while the
1822 primary was still in communications-interrupted, and came back online,
1823 the lease databases would not be fully transferred to the secondary.
1824 This was due to the secondary errantly sending an extra UPDREQ message
1825 when the primary made its state transition to PARTNER-DOWN known.
1827 - The package will now compile cleanly in gcc 3.3 and 3.4. As a side effect,
1828 lease structures will be 9 bytes smaller on all platforms. Thanks to
1829 Jason Vas Dias at Red Hat.
1831 - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
1832 properly restricted to only detecting broadcast interfaces. Thanks
1833 to a patch from Jason Vas Dias at Red Hat.
1835 - decode_udp_ip_header was changed so that the IP address was copied out
1836 to a variable, rather than referenced by a pointer. This enforces 4-byte
1837 alignment of the 32-bit IP address value. Thanks to a patch from Dr.
1840 - An incorrect log message was corrected thanks to a patch from
1843 - A bug in DDNS was repaired, where if the server's first DDNS action was
1844 a DDNS removal rather than a DDNS update, the resolver library's
1845 retransmit timer and retry timer was set to the default, implying a
1846 15 second timeout interval. Which is a little excessive in a synchronous,
1847 single-threaded system. In all cases, ISC DHCP should now hold fast to
1848 a 1-second timeout, trying only once.
1850 - The siaddr field was being improperly set to the server-identifier when
1851 responding to DHCP messages. RFC2131 clarified the siaddr field as
1852 meaning the 'next server in the bootstrap process', eg a tftp server.
1853 The siaddr field is now left zeroed unless next-server is configured.
1855 - mockup_lease() could have returned in an error condition (or in the
1856 condition where no fixed-address was found matching the shared
1857 network) with stale references to a host record. This is probably not
1858 a memory leak since host records generally never die anyway.
1860 - A bug was repaired where failover servers would let stale client identifiers
1861 persist on leases that were reallocated to new clients not sending an id.
1863 - Binding scopes ("set var = value;") are now removed from leases allocated
1864 by failover peers if the lease had expired. This should help reduce the
1865 number of stale binding scopes on leases.
1867 - A small memory leak was closed involving client identifiers larger than
1868 7 bytes, and failover.
1870 - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
1871 cause an internal function to overflow heap. Thanks to Jason Vas Dias
1874 - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
1875 or 'NUMBER_OR_NAME' was repaired. Hexadecimal parsing is affected, and
1878 - In several cases, parse warnings were being issued before the lexical
1879 token had been advanced to the token whose value was causing an error...
1880 causing parse warnings to claim the problem is on the wrong token.
1882 - Host declarations matching on client identifier for dynamic leases will
1883 no longer match fixed-address host declarations (this is now identical
1884 to behaviour for host records matching on hardware address).
1886 Changes since 3.0.2rc3
1888 - A previously undocumented configuration directive, 'local-address',
1889 was documented in the dhcpd.conf manpage.
1891 Changes since 3.0.2rc2
1893 - Two variables introduced in 3.0.2b1 were used without being initialized
1894 in the case where neither the FILE nor SNAME fields were available for
1895 overloading. This was repaired.
1897 - A heretofore believed to be impossible corner case of the option
1898 overloading implementation turned out to be possible ("Unable to sort
1899 overloaded options after 10 tries."). The implementation was reworked
1900 to consider the case of an option so large it would require more than
1901 three chunks to fit.
1903 - Many other instances of variables being used without being initialized
1906 - An uninitialized variable in omapi_io_destroy() led to the discovery
1907 that this function may result in orphaned pointers (and hence, a memory
1910 Changes since 3.0.2rc1
1912 - allocate_lease() was rewritten to repair a bug in which the server would
1913 try to allocate an ABANDONED lease when FREE leases were available.
1915 Changes since 3.0.2b1
1917 - Some dhcp-eval.5 manpage formatting was repaired.
1921 - A bug was fixed in the server's 'option overloading' implementation,
1922 where options loaded into the 'file' and 'sname' packet fields were
1923 not aligned precisely as rfc2131 dictates.
1925 - The FreeBSD client script was changed to support the case where a domain
1926 name was not provided by the server.
1928 - A memory leak in 'omshell' per each command line parsed was
1929 repaired, thanks to a patch from Jarkko Torppa.
1931 - Log functions writing to stderr were adjusted to use the STDERR_FILENO
1932 system definition rather than '2'. This is a no-op for 90% of platforms.
1934 - One call to trace_write_packet_iov() counted the number of io vectors
1935 incorrectly, causing inconsistent tracefiles. This was fixed.
1937 - Some expression parse failure memory leaks were closed.
1939 - A host byte order problem in tracefiles was repaired.
1941 - Pools configured in DHCPD for failover possessing permission lists that
1942 previously were assumed to not include dyanmic bootp clients are now
1943 a little more pessimistic. The result is, dhcpd will nag you about just
1944 about most pools that possess a 'allow' statement with no 'deny' that
1945 would definitely match a dynamic bootp client.
1947 - The 'ddns-update-style' configuration warning bit now insists that
1948 the configuration be globally scoped.
1950 - Two memory leaks in dhclient were closed thanks to a patch from Felix
1953 - Some minor but excellently pedantic documentation errors were fixed
1954 thanks to a patch from Thomas Klausner.
1956 - Bugs in operator precedence in executable statements have been repaired
1957 once again. More legal syntaxes should be parsed legally.
1959 - Failing to initialize a tracefile for any reason if a tracefile was
1960 specified is now a fatal error. Thanks to a patch from Albert Herranz.
1962 - Corrected a bug in which the number of leases transferred as calculated
1963 by the failover primary and sent to peers in POOLRESP responses may be
1964 incorrect. This value is not believed to be used by other failover
1965 implementations, excepting perhaps as logged information.
1967 - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
1968 sending POOLREQ messages instead of POOLRESP mesasges. This message
1969 was essentially ignored since failover secondaries effectively do not
1970 respond to POOLREQ messages.
1972 - Type definitions for various bitwidths of integers in the sunos5-5
1973 build of ISC DHCP have been fixed. It should compile and run more
1974 easily when built in 64-bit for this platform.
1976 - "allow known-clients;" is now a legal syntax, to avoid confusion.
1978 - If one dhcp server chooses to 'load balance' a request to its failover
1979 peer, it first checks to see if it believes said peer has a free
1980 lease to allocate before ignoring the DISCOVER.
1982 - log() was logging a work buffer, rather than the value returned by
1983 executing the statements configured by the user. In some cases,
1984 the work buffer and the intended results were the same. In some other
1985 cases, they were not. This was fixed thanks to a patch from Gunnar
1986 Fjone and directconnect.no.
1988 - Compiler warnings for some string type conversions was fixed, thanks
1989 to Andreas Gustafsson.
1991 - The netbsd build environments were simplified to one, in which
1992 -Wconversion is not used, thanks to Andreas Gustafsson.
1994 - How randomness in the backoff-cutoff dhclient configuration variable
1995 is implemented was better documented in the manpage, and the behaviour
1996 of dhclient in REQUEST timeout handling was changed to match that of
1997 DISCOVER timeout handling.
1999 - Omapi was hardened against clients that pass in null values, thanks
2000 to a patch from Mark Jason Dominus.
2002 - A bug was fixed in dhclient that kept it from doing client-side
2003 ddns updates. Thanks to a patch from Andreas Gustafsson, which
2004 underwent some modification after review by Jason Vas Dias.
2006 - Failover implementations disconnected due to the network between
2007 them (rather than one of the two shutting down) will now try to
2008 re-establish the failover connection every 5 seconds, rather than
2009 to simply try once and give up until one of them is restarted.
2010 Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
2011 by Greger V. Teigre which led to an enhancement to it.
2013 - A problem that kept DHCP Failover secondaries from tearing down
2014 ddns records was repaired. Thanks to a patch from Ulf Ekberg from
2017 - 64bit pointer sizes are detected properly on FreeBSD now.
2019 - A bug was repaired where the DHCP server would leave stale references
2020 to host records on leases it once thought about offering to certain
2021 clients. The result would be to apply host and 'known' scopes to the
2022 wrong clients (possibly denying booting). NOTE: The 'mis-host' patch
2023 that was being circulated as a workaround is not the way this bug was
2024 fixed. If you were a victim of this bug in 3.0.1, you are cautioned
2025 to proceed carefully and see if it fixes your problem.
2027 - A bug was repaired in the server's DHCPINFORM handling, where it
2028 tried to divine the client's address from the source packet and
2029 would get it wrong. Thanks to Anshuman Singh Rawat.
2031 - A log message was introduced to help illuminate the case where the
2032 server was unable to find a lease to assign to any BOOTP client.
2033 Thanks to Daniel Baker.
2035 - A minor dhcpd.conf.5 manpage error was fixed.
2037 Changes since 3.0.1rc14
2039 - The global variable 'cur_time' was centralized and is now uniformly of a
2040 type #defined in system-dependent headers. It had previously been defined
2041 in one of many places as a 32-bit value, and this causes mayhem on 64-bit
2042 big endian systems. It probably wasn't too healthy on little endian
2045 - A printf format string error introduced in rc14 was repaired.
2047 - AIX system-dependent header file was altered to only define NO_SNPRINTF
2048 if the condition used to #ifdef in vsnprintf in AIX' header files
2051 - The Alpha/OSF system-dependent header file was altered to define
2052 NO_SNPRINTF on OS revisions older than 4.0G.
2054 - omapip/test.c had string.h added to its includes.
2056 Changes since 3.0.1rc13
2058 ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
2059 in logging messages with excessively long hostnames provided by the
2060 clients. It is highly probable that these could have been used by
2061 attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
2062 release candidates 12 or 13. Special thanks to Gregory Duchemin for
2063 both finding and solving the problem.
2065 ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
2066 in log_*() functions was evidenced, on some specific platforms where
2067 vsnprintf() was not believed to be available and calls were wrapped to
2068 sprintf() instead. Again, credit goes to Gregory Duchemin for finding
2069 the problem. Calls to snprintf() are now linked to a distribution-local
2070 snprintf implementation, only in those cases where the architecture is
2071 not known to provide one (see includes/cf/[arch].h). If you experience
2072 linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
2073 is where to look. This vulnerability did not exist in any previously
2074 published version of ISC DHCP.
2076 - Compilation on hpux 11.11 was repaired.
2078 - 'The cross-compile bug fix' was backed out.
2080 Changes since 3.0.1rc12
2082 - Fixed a bug in omapi lease lookup function, to form the hardware
2083 address for the hash lookup correctly, thanks to a patch from
2086 - Fixed a bug where dhcrelay was sending relayed responses back to the
2087 broadcast address, but with the source's unicast mac address. Should
2088 now conform to rfc2131 section 4.1.
2090 - Cross-compile bug fix; use $(AR) instead of ar. Thanks to Morten Brorup.
2092 - Fixed a crash bug in dhclient where dhcpd servers that do not provide
2093 renewal times results in an FPE. As a side effect, dhclient can now
2094 properly handle 0xFFFFFFFF (-1) expiry times supplied by servers. Thanks
2095 to a patch from Burt Silverman.
2097 - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
2098 and reformatted to correct a compilation error on Solaris platforms.
2100 - A patch was applied which fixes a case where leases read from the
2101 leases database do not properly over-ride previously read leases.
2103 - dhcpctl.3 manpage was tweaked.
2105 Changes since 3.0.1rc11
2107 - A patch from Steve Campbell was applied with minor modifications to
2108 permit reverse dns PTR record updates with values containing spaces.
2110 - A patch from Florian Lohoff was applied with some modifications to
2111 dhcrelay. It now discards packets whose hop count exceeds 10 by default,
2112 and a command-line option (-c) can be used to set this threshold.
2114 - A failover bug relating to identifying peers by name length instead of
2117 - Declaring failover configs within shared-network statements should no
2118 longer result in error.
2120 - The -nw command line option to dhclient now works.
2122 - Thanks to a patch from Michael Richardson:
2123 - Some problems with long option processing have been fixed.
2124 - Some fixes to minires so that updates of KEY records will work.
2126 - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
2127 see contrib/ms2isc/readme.txt for revision notes.
2129 - Dhclient no longer uses shell commands to kill another instance of
2130 itself, it sends the signal directly. Thanks to a patch from Martin
2133 - The FreeBSD dhclient-script was changed so that a failure to write to
2134 /etc/resolv.conf does not prematurely end the script. This keeps dhclient
2135 from looping infinitely when this is the case. Thanks to a patch from
2138 - A patch from Bill Stephens was applied which resolves a problem with lease
2139 expiry times in failover configurations.
2141 - A memory leak in configuration parsing was closed thanks to a patch from
2144 - The function which discovers interfaces will now skip non-broadcast or
2145 point-to-point interfaces, thanks to a patch from David Brownlee.
2147 - Options not yet known by the dhcpd or dhclient have had their names
2148 changed such that they do not contain # symbols, in case they should ever
2149 appear in a lease file. An option that might have been named "#144" is
2152 - Another patch from Bill Stephens which allows the ping-check timeout to
2153 be configured as 'ping-timeout'. Defaults to 1.
2155 Changes since 3.0.1rc10
2157 - Potential buffer overflows in minires repaired.
2159 - A change to the linux client script to use /bin/bash, since /bin/sh may
2162 - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
2164 - A correction of boolean parsing syntax validation - some illegal syntaxes
2165 that worked before are now detected and produce errs, some legal syntaxes
2166 that errored before will now work properly.
2168 - Some search-and-replace errors that caused some options to change their
2171 - Shu-min Chang of the Intel corporation has contributed a perl script and
2172 module that converts the MS NT4 DHCP configuration to a ISC DHCP3
2175 - Applied the remainder of the dhcpctl memory leak patch provided by Bill
2176 Squier at ReefEdge, Inc. (groo@reefedge.com).
2178 - Missing non-optional failover peer configurations will now result in a soft
2179 error rather than a null dereference.
2181 Changes since 3.0.1rc9
2183 - A format string was corrected to fix compiler warnings.
2185 - A number of spelling corrections were made in the man pages.
2187 - The dhclient.conf.5 man page was changed to refer to do-forward-updates
2188 rather than a configuration option that doesn't exist.
2190 - A FreeBSD-specific bug in the interface removal handling was fixed.
2192 - A Linux-specific Token Ring detection problem was fixed.
2194 - Hashes removed from as-yet-unknown agent options, having those options
2195 appear in reality before we know about them will no longer produce
2196 self-corrupting lease databases.
2198 - dhclient will use the proper port numbers now when using the -g option.
2200 - A order-of-operations bug with 2 match clauses in 1 class statement is
2201 fixed thanks to a patch from Andrew Matheson.
2203 - Compilation problems on Solaris were fixed.
2205 - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
2207 - A fix to the dhcp ack process which makes certain group options will be
2208 included in the first DHCPOFFER message was made thanks to a patch from
2211 - A few memory leaks were repaired thanks to patches from Bill Squier at
2212 ReefEdge, Inc. (groo@reefedge.com).
2214 - A fix for shared-networks that sometimes give clients options for the
2215 wrong subnets (in particular, 'option routers') was applied, thanks to
2216 Ted Lemon for the patch.
2218 - Omshell's handling of dotted octets as values was changed such that dots
2219 one after the other produce zero values in the integer string.
2221 Changes since 3.0.1rc8
2223 - Fix a format string vulnerability in the server that could lead to a
2224 remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
2226 - Add additional support for NetBSD/sparc64.
2228 - Fix a bug in the command-line parsing of the client. Also, resolve
2231 - Add better support for shells other than bash in the Linux client
2234 - Various build fixes for modern versions of FreeBSD and Linux.
2236 - Fix a bad bounds check when printing binding state names.
2238 - Clarify documentation about fixed-address and multiple addresses.
2240 - Fix a typo in the authoritative error message.
2242 - Make a log entry when we can't write a billing class.
2244 - Use conversion targets that are the right size on all architectures.
2246 - Increment the hop count when relaying.
2248 - Log a message when lease state is changed through OMAPI.
2250 - Don't rerun the shared_network when evaluating the pool.
2252 - Fix a reversed test in the parser.
2254 - Change the type of rbuf_max.
2256 - Make FTS_LAST a manifest constant to quiet warnings.
2258 Changes since 3.0.1rc7
2260 - Fix two compiler warnings that are generated when compiling on Solaris
2261 with gcc. These stop the build, even though they weren't actually
2262 errors, because we prefer that our builds generate no warnings.
2264 Changes since 3.0.1rc6
2266 - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
2269 - Implement lease stealing for cases where the primary has fewer leases
2270 than the secondary, as called for by the standard.
2272 - Add a fudge factor to the lease expiry acceptance code, (suggested
2273 by Kevin Miller of CMU).
2275 - Fix a bug in permit_list_match that made it much too willing to say
2276 that two permit lists matched.
2278 - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
2279 also more compact) messages about DNS updates.
2281 - Fix a bug in generating wire-format domain names for the FQDN option.
2283 - Fix a bug where the FQDN option would not be returned if the client
2284 requested it, contrary to the standard.
2286 - On Darwin, use the FreeBSD DHCP client script.
2288 - On NetBSD/sparc, don't check for casting warnings.
2290 - Add a flag in the DHCP client to disable updating the client's A
2291 record when sending an FQDN option indicating that the client is
2292 going to update its A record.
2294 - In the client, don't attempt a DNS update until one second after
2295 configuring the new IP address, and if the update times out, keep
2296 trying until a response, positive or negative, is received from the
2299 - Fix an uninitialized memory bug in the DHCP client.
2301 - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
2303 - Fix a bug in ns_parserr(), where it was returning the wrong sort
2304 of result code in some cases (suggested by Ben Harris of the
2307 - Fix a bug in is_identifier(), where it was checking against EOF
2308 instead of the END_OF_FILE token (also suggested by Ben Harris).
2310 - Fix a bug where if an option universe contained no options, the
2311 DHCP server could dump core (Walter Steiner).
2313 - Fix a bug in the handling of encapsulated options.
2315 - Fix a bug that prevented NWIP suboptions from being processed.
2317 - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
2318 as modifier flags to the FTS_ACTIVE state, as called for in the
2319 failover protocol standard.
2321 - Fix bugs in the pool merging code that resulted in references and
2322 dereferences of null pointers. This bug had no impact unless the
2323 POINTER_DEBUG flag was defined.
2325 - In the server, added a do-forward-updates flag that can be used to
2326 disable forward updates in all cases, so that sites that want the
2327 clients to take sole responsibility for updating their A record can
2330 - Make it possible to disable optimization of PTR record updates.
2332 Changes since 3.0.1rc5
2334 - Include some new documentation and changes provided by Karl Auer.
2336 - Add a workaround for some Lexmark printers that send a double-NUL-
2337 terminated host-name option, which would break DNS updates.
2339 - Fix an off-by-one error in the MAC-address checking code for
2340 DHCPRELEASE that was added in 3.0.1rc5.
2342 - Fix a bug where client-specific information was not being discarded
2343 from the lease when it expired or was released, resulting in
2344 problems if the lease was reallocated to a different client.
2346 - If more than one allocation pool is specified that has the same set
2347 of constraints as another allocation pool on the same shared
2348 network, merge the two pools.
2350 - Don't print an error in fallback_discard, since this just causes
2351 confusion and does not appear to be helping to encourage anyone to
2354 Changes since 3.0.1rc4
2356 - Fix a bug that would cause the DHCP server to spin if asked to parse
2357 a certain kind of incorrect statement.
2359 - Fix a related bug that would prevent an error from being reported in
2362 - Additional documentation.
2364 - Make sure that the hardware address matches the lease when
2365 processing a DHCPRELEASE message.
2367 Changes since 3.0.1rc3
2369 - A minor bug fix in the arguments to a logging function call.
2370 - Documentation update for dhcpd.conf.
2372 Changes since 3.0.1rc2
2374 - Allow the primary to send a POOLREQ message. This isn't what the current
2375 failover draft says to do, so we may have to back it out if I can't get the
2376 authors to relent, but the scheme for balancing that's specified in the
2377 current draft seems needlessly hairy, so I'm floating a trial balloon.
2378 The rc1 code did not implement the method described in the draft either.
2380 Changes since 3.0.1rc1
2382 - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
2383 domain or RRSET. This allows the DHCP server to forget about a name
2384 it added to the DNS once it's been removed, even if the DHCP server
2385 wasn't the one that removed it.
2387 - Install defaults for failover maximum outstanding updates and maximum
2388 silent time. This prevents problems that might occur if these values
2389 were not configured.
2391 - Don't do DDNS deletes if ddns-update-style is none.
2393 - Return relay agent information options in DHCPNAK. This prevents DHCPNAK
2394 messages from being dropped when the relay agent information option contains
2395 routing information.
2397 - Fix a problem where coming up in recover wouldn't result in an update
2400 - Add some more chatty messages when we start a recovery update and when it's
2403 - Fix a possible problem where some state might have been left around
2404 after the peer lost contact and regained contact about how many updates
2407 - Don't nix a lease update because of a lease conflict. This test has
2408 never (as far as I know) prevented a mistake, and it appears to cause
2409 problems with failover.
2411 - Add support in rc history code for keeping a selective history, rather
2412 than a history of all references and dereferences. This code is only used
2413 when extensive additional debugging is enabled.
2417 - Make allocators for hash tables. As a side effect, this fixes a memory
2418 smash in the subclass allocation code.
2420 - Fix a small bug in omshell where if you try to close an object when
2421 no object is open, it dumps core.
2423 - Fix an obscure coredump that could occur on shutdown.
2425 - Fix a bug in the recording of host declaration rubouts in the lease file.
2427 - Fix two potential spins in the host deletion code.
2429 - Fix a core dump that would happen if an application tried to update
2430 a host object attribute with a null value.
2432 Changes since 3.0 Release Candidate 12
2434 - Fix a memory leak in the evaluation code.
2436 - Fix an obscure core dump.
2438 - Print a couple of new warnings when parsing the configuration file
2439 when crucial information is left out.
2441 - Log "no free leases" as an error.
2443 - Documentation updates.
2445 Changes since 3.0 Release Candidate 11
2447 - Always return a subnet selection option if one is sent.
2449 - Fix a warning that was being printed because an automatic data
2450 structure wasn't zeroed.
2452 - Fix some failover state transitions that were being handled
2455 - When supersede_lease is called on a lease whose end time has already
2456 expired, but for which a state transition has not yet been done, do
2457 a state transition. This fixes the case where if the secondary
2458 allocated a lease to a client and the lease "expired" while the
2459 secondary was in partner-down, no expiry event would actually
2460 happen, so the lease would remain active until the primary was
2463 Changes since 3.0 Release Candidate 10
2465 - Fix a bug that was preventing released leases from changing state
2466 in failover-enabled pools.
2468 - Fix a core dump in the client identifier finder code (for host
2471 - Finish fixing a bug where bogus data would sometimes get logged to
2472 the dhclient.leases file because it was opened as descriptor 2.
2474 - Fix the Linux dhclient-script according to suggestions made by
2475 several people on the dhcp-client mailing list.
2477 - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
2479 - Print an error message and refuse to run if a failover peer is
2480 defined but not referenced by any pools.
2482 - Correct a confusing error message in failover.
2484 Changes since 3.0 Release Candidate 9
2486 - Fix a bug in lease allocation for Dynamic BOOTP clients.
2488 Changes since 3.0 Release Candidate 8 Patchlevel 2
2490 - Fix a bug that prevented update-static-leases from working.
2492 - Document failover-state OMAPI object.
2494 - Fix a compilation error on SunOS 4.
2496 Changes since 3.0 Release Candidate 8 Patchlevel 1
2498 - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
2499 This was introduced in rc8pl1 as an unintended result of the memory
2500 leakage fixes that were in pl1.
2502 - Fix a long-standing bug where the server would record that an update
2503 had been done for a client with no name, even though no update had
2504 been done, and then when the client's lease expired the deletion of
2505 that nonexistant record would time out because the name was the null
2508 - Clean up the omshell, dhcpctl and omapi man pages a bit.
2510 Changes since 3.0 Release Candidate 8
2512 - Fix a bug that could cause the DHCP server to spin if
2513 one-lease-per-client was enabled.
2515 - Fix a bug that was causing core dumps on BSD/os in the presence of
2518 - In partner-down state, don't restrict lease lengths to MCLT.
2520 - On the failover secondary, record the MCLT received from the primary
2521 so that if we come up without a connection to the primary we don't
2522 wind up giving out zero-length leases.
2524 - Fix some compilation problems on BSD/os.
2526 - Fix a bunch of memory leaks.
2528 - Fix a couple of bugs in the option printer.
2530 - Fix an obscure error reporting bug in the dns update code, and also
2531 make the message clearer when a key algorithm isn't supported.
2533 - Fix a bug in the tracing code that prevented trace runs that used
2534 tcp connections from being played back.
2536 - Add some additional debugging capability for catching memory leaks
2539 - Make the client release the lease correctly on shutdown.
2541 - Add some configurability to the build system.
2543 - Install omshell manual page in man1, not man8.
2545 - Craig Gwydir sent in a patch that fixes a long-standing bug in the
2546 DHCP client that could cause core dumps, but that for some reason
2547 hadn't been noticed until now.
2549 Changes since 3.0 Release Candidate 7
2551 - Fix a bug in failover where we weren't sending updates after a
2552 transition from communications-interrupted to normal.
2554 - Handle expired/released/reset -> free transition according to the
2555 protocol specification (this works - the other way not only wasn't
2556 conformant, but also didn't work).
2558 - Add a control object in both client and server that allows either
2559 daemon to be shut down cleanly.
2561 - When writing a lease, if we run out of disk space, shut down the
2562 output file and insist on writing a new one before proceeding.
2564 - In the server, if the OMAPI listener port is occupied, keep trying
2565 to get it, rather than simply giving up and exiting.
2567 - Support fetching variables from leases and also updating and adding
2568 variables to leases via OMAPI.
2570 - If two failover peers have wildly different clocks, refuse to start
2573 - Fix a bug in the DNS update code that could cause core dumps when
2574 running on alpha processors.
2576 - Fixed a bug in ddns updates for static lease entries, thanks to a
2577 patch from Andrey M Linkevitch.
2579 - Add support for Darwin/MacOS X
2581 - Install omshell (including new documentation).
2583 - Support DNS updates in the client (this is a very obscure feature
2584 that most DHCP client users probably will not be able to use).
2586 - Somewhat cleaner status logging in the client.
2588 - Make OMAPI key naming syntax compatible with the way keys are
2589 actually named (key names are domain names).
2591 - Fix a bug in the lease file writer.
2593 - Install DHCP ISC headers in a different place than BIND 9 ISC
2594 headers, to avoid causing trouble in BIND 9 builds.
2596 - Don't send updates for attributes on an object when the attributes
2597 haven't changed. Support deleting attributes on remote objects.
2599 - Fix a number of bugs in omshell, and add the unset and refresh
2602 - Handle disconnects in OMAPI a little bit more intelligently (so that
2603 the caller gets ECONNRESET instead of EINVAL).
2605 - Fix a bunch of bugs in the handling of clients that have existing
2606 leases when the try to renew their leases while failover is
2609 Changes since 3.0 Release Candidate 6
2611 - Fix a core dump that could happen when processing a DHCPREQUEST from
2612 a client that had a host declaration that contained both a
2613 fixed-address declaration and a dhcp-client-identifier option
2614 declaration, if the client identifier was longer than nine bytes.
2616 - Fix a memory leak that could happen in certain obscure cases when
2617 using omapi to manipulate leases.
2619 - Fix some bugs and omissions in omshell.
2621 Changes since 3.0 Release Candidate 5
2623 - Fix a bug in omapi_object_dereference that prevented objects in
2624 chains from having their reference counts decreased on dereference.
2626 - Fix a bug in omapi_object_dereference that would prevent object
2627 chains from being freed upon removal of the last reference external
2630 - Fix a number of other memory leaks in the OMAPI protocol subsystem.
2632 - Add code in the OMAPI protocol handler to trace memory leakage.
2634 - Clean up the memory allocation/reference history printer.
2636 - Support input of dotted quads and colon-separated hex lists as
2637 attribute values in omshell.
2639 - Fix a typo in the Linux interface discovery code.
2641 - Conditionalize a piece of trace code that wasn't conditional.
2643 Changes since 3.0 Release Candidate 4
2645 - Fix a bug that would prevent leases from being abandoned properly on
2648 - Fix failover peer OMAPI support.
2650 - In failover, correctly handle expiration of leases. Previously,
2651 leases would never be reclaimed because they couldn't make the
2652 transition from EXPIRED to FREE.
2654 - Fix some broken failover state transitions.
2656 - Documentation fixes.
2658 - Take out an unnecessary check in DHCP relay agent information option
2659 stashing code that was preventing REBINDING clients from rebinding.
2661 - Prevent failover peers from allocating leases in DHCPREQUEST
2662 processing if the lease belongs to the other server.
2664 - Record server version in lease file introductory comment.
2666 - Correctly report connection errors in OMAPI and failover.
2668 - Make authentication signature algorithm name comparisons in OMAPI
2671 - Fix compile problem on SunOS 4.x
2673 - If a signature algorithm is not terminated with '.', terminate it so
2674 that comparisons between fully-qualified names will work
2677 - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
2678 systems with the probe not working correctly.
2680 - Don't allow user to type omapi key on command line of omshell.
2682 Changes since 3.0 Release Candidate 3
2684 - Do lease billing on startup in a way that I *think* will finally do
2685 the billing correctly - the previous method could overbill as a
2686 result of duplicate leases.
2688 - Document OMAPI server objects.
2690 Changes since 3.0 Release Candidate 2 Patchlevel 1
2692 - Fix some problems in the DDNS update code. Thanks to Albert
2693 Herranz for figuring out the main problem.
2695 - Fix some reference counting errors on host entries that were causing
2698 - Fix a byte-swap bug in the token ring code, thanks to Jochen
2701 - Fix a bug in lease billing, thanks to Jonas Bulow.
2703 Changes since 3.0 Release Candidate 2
2705 - Change the conditions under which a DHCPRELEASE is actually
2706 committed to be consistent with lease binding states rather than
2707 using the lease end time. This may fix some problems with the
2710 - Fix a bug where lease updates would fail on Digital Unix (and maybe
2711 others) because malloc was called with a size of zero.
2713 - Fix a core dump that happens when the DHCP server can't create its
2716 Changes since 3.0 Release Candidate 1 Patchlevel 1
2718 - Fix the dhcp_failover_put_message to not attempt to allocate a
2719 zero-length buffer. Some versions of malloc() fail if you try to
2720 allocate a zero-length buffer, and this was causing problems on,
2723 - Fix a case where the failover code was printing an error message
2724 when no error had occurred.
2726 - Fix a problem where when a server went down and back up again, the
2727 peer would not see a state transition and so would stay in the
2728 non-communicating state.
2730 - Be smart about going into recover_wait.
2732 - Fix a problem in the failover implementation where peers would fail
2733 to come into sync if interrupted in the RECOVER state. This could
2734 have been the cause of some problems people have reported recently.
2736 - Fix a problem with billing classes where they would not be unbilled
2737 when the client lease expired.
2739 - If select fails, figure out which descriptor is bad, and cut it out
2740 of the I/O loop. This prevents a potentially nasty spin. I
2741 haven't heard any report it in a while, but it came up consistently
2744 - Fix a bug in the relay agent where if you specified interfaces on
2745 the command line, it would fail.
2747 - Fix a couple of small bugs in the omapi connection object (no known
2750 - Add the missing 3.0 Beta 1 lease conversion script.
2752 - Read dhcp client script hooks if they exist, rather than only if
2755 Changes since 3.0 Release Candidate 1
2757 - Fix a memory smash that happens when fixed-address leases are used.
2758 ANY SITE AT WHICH FIXED-ADDRESS STATEMENTS ARE BEING USED SHOULD
2759 UPGRADE IMMEDIATELY. This has been a long-standing bug - thanks to
2760 Alvise Nobile for discovering it and helping me to find it!
2762 - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
2765 - There is a known problem with the DHCP server doing failover on
2766 Compaq Alpha systems. This patchlevel is not a release candidate
2767 because of this bug. The bug should be straightforward to fix, so
2768 a new release candidate is expected shortly.
2770 - There is a known problem in the DDNS update code that is probably a
2771 bug, and is not, as far as we know, fixed in this patchlevel.
2773 Changes since 3.0 Beta 2 Patchlevel 24
2775 - Went over problematic failover state transitions and made them all
2776 work, so that failover should now much less fragile.
2778 - Add some dhcpctl and omapi documentation
2780 - Fix compile errors when compiling with unusual predefines.
2782 - Make Token Ring work on Linux 2.4
2784 - Fix the Digital Unix BPF_WORDALIGN bug.
2786 - Fix some dhcp client documentation errors.
2788 - Update some parts of the README file.
2790 - Support GCC on SCO.
2792 Changes since 3.0 Beta 2 Patchlevel 23
2794 - Fix a bug in the DNS update code where a status code was not being
2795 checked. This may have been causing core dumps.
2797 - When parsing the lease file, if a lease declaration includes a
2798 billing class statement, and the lease already has a billing class,
2799 unbill the old class.
2801 - When processing failover transactions, where acks will be deferred,
2802 process the state transition immediately.
2804 - Don't try to use the new SIOCGIFCONF buffer size detection code on
2805 Linux 2.0, which doesn't provide this functionality.
2807 - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
2809 - Fix a problem in using the which command in the configure script.
2811 - Fix a parse error in the client when setting up an omapi listener.
2813 - Document the -n and -g flags to the client.
2815 - Make sure there is always a stdin and stdout on startup. This
2816 prevents shell scripts from accidentally writing error messages into
2817 configuration files that happen to be opened as stderr.
2819 - If an interface is removed, the client will now notice that it is
2820 gone rather than spinning. This has only been tested on NetBSD.
2822 - The client will attempt to get an address even if it can't create a
2825 - Don't overwrite tracefiles.
2827 - Fix some memory allocation bugs in failover.
2829 Changes since 3.0 Beta 2 Patchlevel 22
2831 - Apply some patches suggested by Cyrille Lefevre, who is maintaining
2832 the FreeBSD ISC DHCP Distribution port.
2834 - Fix a core dump in DHCPRELEASE.
2836 Changes since 3.0 Beta 2 Patchlevel 21
2838 - This time for sure: fix the spin described in the changes for pl20.
2840 Changes since 3.0 Beta 2 Patchlevel 20
2842 - Fix a problem with Linux detecting large numbers of interfaces (Ben)
2844 - Fix a memory smash in the quotify code, which was introduced in
2847 - Actually fix the spin described in the changes for pl20. The
2848 previous fix only partially fixed the problem - enough to get it
2849 past the regression test.
2851 Changes since 3.0 Beta 2 Patchlevel 19
2853 - Fix a bug that could cause the server to abort if compiled with
2854 POINTER_DEBUG enabled.
2856 - Fix a bug that could cause the server to spin when responding to a
2859 - Apply Joost Mulders' suggested patches for DLPI on x86.
2861 - Support NUL characters in quoted strings.
2863 - Install unformatted man pages on SunOS.
2865 Changes since 3.0 Beta 2 Patchlevel 18
2867 - Allow the server to be placed in partner-down state using OMAPI.
2870 - Implement omshell, which can be used to do arbitrary things to the
2871 server (in theory). (Damien Neil)
2873 - Fix a case where if a client had two different leases the server could
2874 actually dereference the second one when it hadn't been referenced,
2875 leading to memory corruption and a core dump. (James Brister)
2877 - Fix a case where a client could request the address of another client's
2878 lease, but find_lease wouldn't detect that the other client had it, and
2879 would attempt to allocate it to the client, resulting in a lease conflict
2882 - Fix a case where a client with more than one client identifier could be
2883 given a lease where the hardware address was correct but the client
2884 identifier was not, resulting in a lease conflict message.
2886 - Fix a problem where the server could write out a colon-separated
2887 hex list as a value for a variable, which would then not parse.
2888 The fix is to always write strings as quoted strings, with any
2889 non-printable characters quoted as octal escape sequences. So
2890 a file written the old way still won't work, but new files written
2893 - Fix documentation for sending non-standard options.
2895 - Use unparsable names for unknown options. WARNING: this will
2896 break any configuration files that use the option-nnn convention.
2897 If you want to continue to use this convention for some options,
2898 please be sure to write a definition, like this:
2900 option option-nnn code nnn = string;
2902 You can use a descriptive name instead of option-nnn if you like.
2904 - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
2905 DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
2906 result of a deceptively silly bug in supersede_lease.
2908 - Fix client script exit status check, according to a fix supplied by
2911 - Fix an endianness bug in the tracefile support, regarding ICMP
2914 - Fix a bug in the client where the medium would not work correctly if
2915 it contained quoted strings.
2917 ** there was no pl17 **
2919 Changes since 3.0 Beta 2 Patchlevel 16
2921 - Add support for transaction tracing. This allows the state of the
2922 DHCP server on startup, and all the subsequent transactions, to be
2923 recorded in a file which can then be played back to reproduce the
2924 behaviour of the DHCP server. This can be used to quickly
2925 reproduce bugs that cause core dumps or corruption, and also for
2926 tracking down memory leaks.
2928 - Incorporate some bug fixes provided by Joost Mulders for the DLPI
2929 package which should clear up problems people have been seeing on
2932 - Fix bugs in the handling of options stored as linked lists (agent
2933 options, fqdn options and nwip options) that could cause memory
2934 corruption and core dumps.
2936 - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
2937 not being send in some cases when they were needed.
2939 - Make the lease structure somewhat more compact.
2941 - Make initial failover startup *much* faster. This was researched
2942 and implemented by Damien Neil.
2944 - Add a --version flag to all executables, which prints the program
2945 name and version to standard output.
2947 - Don't rewrite the lease file every thousand leases.
2949 - A bug in nit.c for older SunOS machines was fixed by a patch sent in
2950 by Takeshi Hagiwara.
2952 - Fix a memory corruption bug in the DHCP client.
2954 - Lots of documentation updates.
2956 - Add a feature allowing environment variables to be passed to the
2957 DHCP client script on the DHCP client command line.
2959 - Fix client medium support, which had been broken for some time.
2961 - Fix a bug in the DHCP client initial startup backoff interval, which
2962 would cause two DHCPDISCOVERS to be sent back-to-back on startup.
2964 Changes since 3.0 Beta 2 Patchlevel 15
2966 - Some documentation tweaks.
2968 - Maybe fix a problem in the DLPI code.
2970 - Fix some error code space inconsistencies in ddns update code.
2972 - Support relay agents that intercept unicast DHCP messages to stuff
2973 agent options into them.
2975 - Fix a small memory leak in the relay agent option support code.
2977 - Fix a core dump that would occur if a packet was sent with no
2980 Changes since 3.0 Beta 2 Patchlevel 14
2982 - Finish fixing a long-standing bug in the agent options code. This
2983 was causing core dumps and failing to operate correctly - in
2984 particular, agent option stashing wasn't working. Agent option
2985 stashing should now be working, meaning that agent options can be
2986 used in class statements to control address allocation.
2988 - Fix up documentation.
2990 - Fix a couple of small memory leaks that would have added up
2991 significantly in a high-demand situation.
2993 - Add a log-facility configuration parameter.
2995 - Fix a compile error on some older operating systems.
2997 - Add the ability in the client to execute certain statements before
2998 transmitting packets to the server. Handy for debugging; not much
2999 practical use otherwise.
3001 - Don't send faked-out giaddr when renewing or bound - again, useful
3004 Changes since 3.0 Beta 2 Patchlevel 13
3006 - Fixed a problem where the fqdn decoder would sometimes try to store
3007 an option with an (unsigned) negative length, resulting in a core
3008 dump on some systems.
3010 - Work around the Win98 DHCP client, which NUL-terminates the FQDN
3013 - Work around Win98 and Win2k clients that will claim they want to do
3014 the update even when they don't have any way to do it.
3016 - Fix some log messages that can be printed when failover is operating
3017 that were not printing enough information.
3019 - It was possible for a DHCPDISCOVER to get an allocation even when
3020 the state machine said the server shouldn't be responding.
3022 - Don't load balance DHCPREQUESTs from clients in RENEWING and
3023 REBINDING, since in RENEWING, if we heard it, it's for us, and in
3024 REBINDING, the client wouldn't have got to REBINDING if its primary
3027 - When we get a bogus state lease binding state transition, don't do
3031 Changes since 3.0 Beta 2 Patchlevel 12
3033 - Fixed a couple of silly compile errors.
3035 Changes since 3.0 Beta 2 Patchlevel 11
3037 - Albert Herranz tracked down and fixed a subtle bug in the base64
3038 decoder that would prevent any key with an 'x' in its base64
3039 representation from working correctly.
3041 - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
3042 hang that they both spotted in the DHCP server - when
3043 one-lease-per-client was set, the code to release the "other" lease
3046 - Fix a problem with alignment of the input buffer in bpf in cases
3047 where two packets arrive in the same bpf read.
3049 - Fix a problem where the relay agent would crash if you specified an
3050 interface name on the command line.
3052 - Add the ability to conditionalize client behaviour based on the
3055 - Add support for the FQDN option, and added support for a new way of
3056 doing ddns updates (ddns update style interim) that allows more than
3057 one DHCP server to update the DNS for the same network(s). This
3058 was implemented by Damien Neil with some additional functionality
3061 - Damien added a "log" statement, so that the configuration file can
3062 be made to log debugging information and other information.
3064 - Fixed a bug that caused option buffers not to be terminated with an
3067 - Fixed a long-standing bug in the support for option spaces where the
3068 options are stored as an ordered list rather than in a hash table,
3069 which could theoretically result in memory pool corruption.
3071 - Prevent hardware declarations with no actual hardware address from
3072 being written as something unparsable, and behave correctly in the
3073 face of a null hardware address on input.
3075 - Allow key names to be FQDNs, and qualify the algorithm name if it is
3076 specified unqualified.
3078 - Modify the DDNS update code so that it never prints the "resolver
3079 failed" message, but instead says *why* the resolver failed.
3081 - Officially support the subnet selection option, which now has an
3084 - Fix a build bug on MacOS X.
3086 - Allow administrator to disable ping checking.
3088 - Clean up dhcpd.conf documentation and add more information about how
3091 Changes since 3.0 Beta 2 Patchlevel 10
3093 - Fix a bug introduced during debugging (!) and accidentally committed
3096 Changes since 3.0 Beta 2 Patchlevel 9
3098 - Fix DHCP client handling of vendor encapsulated options.
3100 - Fix a bug in the handling of relay agent information options introduced
3103 - Stash agent options on client leases by default, and use the stashed
3104 options at renewal time.
3106 - Add the ability to test the client's binding state in the client
3107 configuration language.
3109 - Fix a core dump in the DNS update code.
3111 - Fix some expression evaluation bugs that were causing updates to be
3112 done when no client hostname was received.
3114 - Fix expression evaluation debugging printfs.
3116 - Teach pretty_print_option to print options in option spaces other than
3117 the DHCP option space.
3119 - Add a warning message if the RHS of a not is not boolean.
3121 - Never select for more than a day, because some implementations of
3122 select will just fail if the timeout is too long (!).
3124 - Fix a case where a DHCPDISCOVER from an unknown network would be
3127 - Fix a bug where if a client requested an IP address for which a different
3128 client had the lease, the DHCP server would reallocate it anyway.
3130 - Fix the DNS update code so that if the client changes its name, the DNS
3131 will be correctly updated.
3133 Changes since 3.0 Beta 2 Patchlevel 8
3135 - Oops, there was another subtle math error in the header-length
3138 Changes since 3.0 Beta 2 Patchlevel 7
3140 - Oops, forgot to byte-swap udp header length before bounds-checking it.
3142 Changes since 3.0 Beta 2 Patchlevel 6
3144 - Fix a possible DoS attack where a client could cause the checksummer
3145 to dump core. This was a read, not a write, so it shouldn't be
3146 possible to exploit it any further than that.
3148 - Implement client- and server-side support for using the Client FQDN
3151 - Support for other option spaces in the client has been added. This
3152 means that it is now possible to define a vendor option space on the
3153 client, request options in that space from the server (which must
3154 define the same option space), and then use those options in the
3155 client. This also allows NWIP and Client FQDN options to be used
3158 - Add object initializer support. This means that objects can now be
3159 initialized to something other than all-zeros when allocated, which
3160 makes, e.g., the interface object support code a little more robust.
3162 - Fix an off-by-one bug in the host stuffer. This was causing host
3163 deletes not the work, and may also have been causing OMAPI
3164 connections to get dropped. Thanks to James Brister for tracking
3167 - Fixed a core dump in the interface discovery code that is triggered
3168 when there is no subnet declaration for an interface, but the server
3169 decides to continue running. Thanks to Shane Kerr for tracking
3170 down and fixing this problem.
3172 Changes since 3.0 Beta 2 Patchlevel 5
3174 - Fix a bug in the recent enhancement to the interface discovery code
3175 to support arbitrary-length interface lists.
3177 - Support NUL-terminated DHCP options when initializing client-script
3180 - Fix suffix operator.
3182 - Fix NetWare/IP option parsing.
3184 - Better error/status checking in dhcpctl initialization and omapi
3187 - Fix a potential memory smash in dhcpctl code.
3189 - Fix SunOS4 and (maybe) Ultrix builds.
3191 - Fix a bug where a certain sort of incoming packet could cause a core
3192 dump on Solaris (and probably elsewhere).
3194 - Add some more safety checks in error logging code.
3196 - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
3198 - Fix relay agent so that if an interface is specified on the command
3199 line, the relay agent does not dump core.
3201 - Fix class matching so that match if can be combined with match or
3204 - Do not allow spurious leases in the lease database to introduce
3205 potentially bogus leases into the in-memory database.
3207 - Fix a byte-order problem in the client hardware address type code
3210 - Be slightly less picky about what sort of hardware addresses OMAPI
3211 can install in host declarations.
3213 Changes since 3.0 Beta 2 Patchlevel 4
3215 - Incorporated Peter Marschall's proposed change to array/record
3216 parsing, which allows things like the slp-agent option to be encoded
3217 correctly. Thanks very much to Peter for taking the initiative to
3218 do this, and for doing such a careful job of it (e.g., updating the
3221 - Added an encoding for the slp-agent option. :')
3223 - Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
3224 request for help on this with patches!
3226 - Incorporated a change that should fix a problem reported by Philippe
3227 Jumelle where when the network connection between two servers is
3228 lost, they never reconnect.
3230 - Fix client script files other than that for NetBSD to actually use
3231 make_resolv_conf as documented in the manual page.
3233 - Fix a bug in the packet handling code that could result in a core
3236 - Fix a bug in the bootp code where responses on the local net would
3237 be sent to the wrong MAC address. Thanks to Jerry Schave for
3240 Changes since 3.0 Beta 2 Patchlevel 3
3242 - In the DHCP client, execute client statements prior to using the values
3243 of options, so that the client configuration can overridden, e.g., the
3246 - Fix a reference counting error that would result in very reproducible
3247 failures in updates, as well as occasional core dumps, if a zone was
3248 declared without a key.
3250 - Fix some Linux 2.0 compilation problems.
3252 - Fix a bug in scope evaluation during execution of "on" statements that
3253 caused values not to be recorded on leases.
3255 - If the dhcp-max-message-size option is specified in scope, and the
3256 client didn't send this option, use the one specified in scope to
3257 determine the maximum size of the response.
3259 Changes since 3.0 Beta 2 Patchlevel 2
3261 - Fix a case where spawning subclasses were being allocated
3262 incorrectly, resulting in a core dump.
3264 - Fix a case where the DHCP server might inappropriately NAK a
3267 - Fix a place dhcprequest() where static leases could leak.
3269 - Include memory.h in omapip_p.h so that we don't get warnings about
3272 Changes since 3.0 Beta 2 Patchlevel 1
3274 - Notice when SIOCFIGCONF returns more data than fit in the buffer -
3275 allocate a larger buffer, and retry. Thanks to Greg Fausak for
3278 - In the server, if no interfaces were configured, report an error and
3281 - Don't ever record a state of 'startup'.
3283 - Don't try to evaluate the local failover binding address if none was
3284 specified. Thanks to Joseph Breu for finding this.