1 Internet Systems Consortium DHCP Distribution
9 The DHCP server in version 4.0.x of the ISC DHCP Distribution supports
10 DHCPv6 in addition to DHCP for IPv4.
12 Several new options have been added to the dhcpd executable, which are
13 documented in the man page. Several changes have been made to the
14 configuration file as well, which are also documented in the man
17 There are a number of DHCPv6 limitations and features missing in this
18 release, which will be addressed shortly:
20 - Only Solaris, Linux, FreeBSD, NetBSD, and OpenBSD are supported.
22 - There is no DHCPv6 Relay Agent implementation. There are only DHCPv6
23 Server and Client implementations.
25 - Only a single address is supported per IA.
27 - IA_TA addresses are not supported.
29 - IA_PD prefixes are not supported.
31 - DHCPv6 includes human-readable text in status code messages. These
32 should be configurable, and probably localized via gettext() or the
35 - The "host-identifier" option is limited to a simple token.
37 - Dynamically allocated leases do not respond to Confirm messages.
39 - The client and server can only operate DHCPv4 or DHCPv6 at a time,
40 not both. To use both protocols simultaneously, two instances of the
41 relevant daemon are required, one with the '-6' command line option.
43 For information on how to install, configure and run this software,
44 as well as how to find documentation and report bugs, please consult
47 ISC DHCP now uses standard GNU configure for installation. Please
48 review the output of "./configure --help" to see what options are
51 The system has only been tested on Linux, FreeBSD, and Solaris, and
52 may not work on other platforms. Please report any problems and
53 suggested fixes to <dhcp-users@isc.org>.
58 - The warning logged when an address range doesn't fit in the subnets
59 they were declared has been updated to be more helpful and identify the
60 typo in configuration that created the spanning addresses.
62 - The 'min-secs' configuration parameter's log message has been updated to
65 - A cosmetic bug during potential-conflict recovery that caused the peer's
66 'conflict-done' state message to be logged as 'unknown-state' has been
67 repaired. It is now logged correctly.
69 - Fixed definition of the iaaddr hash functions to use the correct
70 functions when referencing and dereferencing memory.
72 - A bug in failover pool rebalancing that caused POOLREQ message ping-pongs
75 - A flaw in failover pool rebalancing that could cause POOLREQ messages to
76 be sent outside of the min-balance/max-balance scheduled intervals has
79 - Some definitions not in phase with the IANA registry were updated.
81 - Allocated interface IDs are better controlled ('u' bit set to zero,
82 reserved IDs avoided).
84 - Unicast options are taken into account only for RENEWs.
86 - NoAddrsAvail answers to SOLICITs are always ADVERTISEs even when a SOLICIT
87 carries a rapid-commit option.
89 - Return in place of raise an impossible condition when one tries to release
90 an empty active lease.
92 - Timer granularity is now 1/100s in the DHCPv6 client.
94 - A bug was fixed where the 'giaddr' may be used to find the client's subnet
95 rather than its own 'ciaddr'.
97 - A log message was introduced to clarify the situation where a failover
98 'address' parameter (the server's local address) did not resolve to an
101 - The minimum site code value was set to 224 in 3.1.0 to track RFC3942. This
102 broke a lot of legacy site local configurations. The new code in place will
103 track site local space minimum option codes and logs a warning to encourage
104 updates and exploration of site local code migration problems. Option
105 codes less than 128 in site local spaces remain inaccessible.
107 - A possible relay agent option bug was repaired where random server
108 initialization state may have been used to signal the relay agent
109 information options sub-option code for the 'END' of the option space.
111 Changes since 4.0.0b3
113 - The reverse dns name for PTR updates on IPv6 addresses has been fixed to
114 use ip6.arpa. rather than default to in-addr.arpa and require user
117 - dhc6_lease_destroy() and dhc6_ia_destroy() now set lease and IA pointers
118 to NULL after freeing, to prevent subsequent accesses to freed memory.
120 - The DHCPv6 server would not send the preference option unless the
121 client requested it, via the ORO. This has been fixed, so the DHCPv6
122 server will always send the preference value if it is configured.
124 - When addresses were passed as hints to the server in an IA, they were
125 incorrectly handled, sometimes being treated as an error. Now the
126 server will treat these as hints and ignore them if it cannot supply
129 - If the client had multiple addresses, and one expired (was not renewed
130 by the server), the client would continue to attempt to renew the same
131 old address over and over. Now, the client will omit any expired
132 addresses from future Confirm, Renew, or Rebind messages.
134 - dhclient -6 will now select renew/rebind timers based upon the longest
135 address expiration time rather than the shortest expiration time, in
136 order to avoid cascading renewals in the event a server elects not to
137 extend one of multiple IAADDR leases.
139 - The server now limits clients that request multiple addresses to one
140 address per IA by default, which can be adjusted through the
141 "limit-addrs-per-ia" configuration option.
143 - The DHCPv6 client now issues fresh transaction IDs on Renew and Rebind
144 message exchanges, rather than using the most recent ID.
146 - The DHCPv6 server now replies to Information-Request messages.
148 - A bug was fixed in the dhclient-script for BSDs to correctly carry error
149 codes through some conditions.
151 - The parsing of some options in the dhclient lease file, in particular
152 the success DHCPv6 status-code, was fixed.
154 - A bug was fixed that caused the DHCPv6 ORO option to be corrupted with
155 seemingly random values.
157 - A reference overleak in DHCPv6 shared network processing was repaired.
159 - ./configure now autodetects local database locations rather than trying
160 to put dhcpd.leases and dhclient.leases in /usr/local/var/db, which no
163 - Regression fix for bug where server advertised a IPv6 address in
164 response to a SOLICIT but would not return the address in response
167 - A bug was fixed where the DHCPv6 server puts the NoAddrsAvail status
168 code in the IA_NA was fixed. The status code now appears in the root
171 Changes since 4.0.0b2
173 - Clarified error message when lease limit exceeded
175 - Relative time may now be used as a qualifier for 'allow' and 'deny' access
176 control lists. These directives may be used to assist in re-addressing
177 address pools without having to constantly reconfigure the server. Please
178 see 'man dhcpd.conf' for more information on allow/deny 'after time' syntax.
179 Thanks to a patch from Christof Chen.
181 - The server will now include multiple IA_NA's and multiple IAADDRs within
182 them, if advertised by the client. It still only seeks to allocate one
185 Changes since 4.0.0b1
187 - Use different paths for PID and lease files when running in DHCPv4
188 or DHCPv6 mode, so that servers for both protcols can be run
189 simultaneously on a single interface.
191 - Fixed a buffer overflow error which could have allowed a denial
192 of service under unusual server configurations
194 - Eliminated a spurious error message from the client
196 - A number of bugs with the internal handling of lease state on the
197 server have been fixed. Some of these could cause server crashes.
199 - The peer_wants_leases() changes pulled up from 3.1.0 were corrected,
200 'never used' leases will no longer consistently shift between servers
201 on every pool rebalance run.
203 - sendmsg()/recvmsg() control buffers are now declared in such a way to
204 ensure they are correctly aligned on all (esp. 64-bit) architectures.
206 - The client leasing subsystem was streamlined and corrected to account
207 more closely for changes in client link attachment selection.
209 Changes since 4.0.0a3
211 - The DHCP server no longer requires a "ddns-update-style" statement,
212 and now defaults to "none", which means DNS updates are disabled.
214 - Log messages when failover peer names mismatch have been improved to
215 point out the problem.
217 - Bug where server advertised a IPv6 address in response to a SOLICIT
218 but would not return the address in response to a REQUEST. Thanks to
219 Dennis Kou for finding the bug.
221 - Fixed an error causing the server to lock up on lease expiration,
222 reported independently by Jothilingam Vasu and Dennis Kou.
224 - Fixed a ./configure bug where compile tests were failing due to
225 "-Werror" (unused variable) rather than the actual test failure. Lead
226 to inconsistent and unworkable auto-configurations.
228 - Compilation with DLPI and -Werror has been repaired.
230 - Error in decoding IA_NA option if multiple interfaces are present
231 fixed by Marcus Goller.
233 - DHCPv6 server Confirm message processing has been enhanced - it no
234 longer replies only to clients with host {} records, it now replies
235 as directed in RFC3315 section 18.2.2 - that is, to all clients
236 regardless of the existence of bindings.
238 - A core dump during expired lease cleanup has been repaired.
240 - DDNS updates state information are now stored in 'binding scopes' that
241 follow the leases through their lifecycles. This enables DDNS teardowns
242 on leases that are assigned and expired inbetween a server restart (the
243 state is recovered from dhcpd.leases). Arbitrary user-specified binding
244 scopes ('set var = "value";') are not yet supported.
246 - Additional compilation problems on HP/UX have been repaired.
248 Changes since 4.0.0a2
250 - Fix for startup where there are no IPv4 addresses on an interface.
251 Thanks to Marcus Goller for reporting the bug.
253 - Fixed file descriptor leak on listen failure. Thanks to Tom Clark.
255 - Bug in server configuration parser caused server to get stuck on
256 startup for certain bad pool declarations. Thanks to Guillaume
257 Knispel for the bug report and fix.
259 - Code cleaned to remove warnings reported by "gcc -Wall".
261 - DHCPv6 is now the default. You can disable DHCPv6 support using the
262 "--disable-dhcpv6" flag when you run the configure script.
264 - An internal database inconsistency bug was repaired where the server
265 would segfault if a client attempted to renew a lease that had been
266 loaded from persistent storage.
268 - 'request' and 'also request' syntaxes have been added to accommodate
269 the DHCPv6 client configuration. 'send dhcp6.oro' is no longer
272 - Bug fixed where configuration file parsing did not work with
273 zero-length options; this made it impossible to set the
276 - Bogus messages about host records with IPv4 fixed-addresses being of
277 non-128-bits in length were removed.
279 Changes since 4.0.0a1
281 - Bug in octal parsing fixed. Thanks to Bernd Fuhrmann for the report
284 - Autoconf now supplies proper flags for Solaris DHCPv6 builds.
286 - Fix for parsing error on some IPv6 addresses.
288 - Invalid CIDR representation for IPv6 subnets or ranges now checked
289 for when loading configuration.
291 - Compilation on HP/UX has been repaired. The changes should generally
292 apply to any architecture that supplies SIOCGLIFCONF but does not
293 use 'struct lifconf' structures to pass values.
295 - Two new operators, ~= and ~~, have been integrated to implement
296 boolean matches by regular expression (such as may be used in
297 class matching statements). Thanks to a patch by Alexandr S.
298 Agranovsky, which underwent slight modification.
300 - Fix for icmp packets on 64-bit systems (bug introduced in 4.0).
302 - A bug was fixed in interface discovery wherein an error identifying
303 a server-configured interface with no IPv4 addresses would SEGV.
305 - Fixed a bug in which write_lease() might report a failure incorrectly
307 - Added support for DHCPv6 Release messages
309 - Added -x option to dhclient, which triggers dhclient processes
310 to exit gracefully without releasing leases first
312 - All binaries (client, server, relay) now change directories
313 to / before going into daemon mode, so as not to hold $CWD open
315 - Fixed a bug parsing DHCPv6 client-id's in host-identifier statements
317 - Fixed a bug with the 'ddns-updates' boolean server configuration
318 parameter, which caused the server to fail.
320 Changes since 4.0.0-20070413
322 - Old (expired) leases are now cleaned.
324 - IPv6 subnets now have support for arbitrary allocation ranges via
325 a new 'range6' configuration directive.
327 - An obviated option code hash lookup to find D6O_CLIENTID was removed.
329 - Corrected some situations where variables might be used without being
332 - Silenced several other compiler warnings.
334 - Include the more standard sys/uio.h rather than rely upon other
335 header files to include it (fixes a BSD 4.2 compile failure).
337 - Duplicate dhclient-script updates for DHCPv6 to all provided scripts.
339 - DHCPv4 I/O methods that failed to sense hardware address were corrected.
341 - DHCPv4 is now the default (as documented) rather than DHCPv6. The default
342 was set to DHCPv6 to facilitate ease early development, and forgotten.
344 - Corrected a segmentation violation in DHCPv4 socket processing.
346 - dhclient will now fork() into the background once it binds to an
347 IPv6 address, or immediately if the -n flag is supplied.
349 - -q is now the default behaviour on dhclient, with -d or -v enabling
350 non-quiet (stderr logging) mode.
352 - Fix documentation of the domain-search atom (quoted, with commas).
354 - Document DHCPv6 options presently in the default table.
356 - Replaced ./configure shellscripting with GNU Autoconf.
358 Changes since 3.1.0 (NEW FEATURES)
360 - DHCPv6 Client and Server protocol support. Use '-6' to run the daemons
361 as v6-only. Use '-4' to run the daemons as v4-only (default. There is
362 no support currently for both.
364 - Server support for multiple IA_NA options, containing at most one
367 - Client support for one IA_NA option, containing any number of IAADDR
370 - Server support for the DHCPv6 Information-request message.
372 - Inappropriate unicast DHCPv6 messages sent to the server are now
373 discarded, and this has rearchitected the IO system slightly.
375 - The DHCPv6 server DUID defaults to type 1, is persistently stored in
376 the leases database, and can be over-ridden (either completely, or by
377 specifying type 1 or type 2).
379 - The server only uses Rapid-Commit if it has been configured with the
380 Rapid-Commit option and the client requests it.
382 - DDNS support. We now update AAAA records in the same place we would
383 update A records, if we have an IPv6 address. We also generate IP6.ARPA
384 style names for PTR records if we're dealing with an IPv6 address. Both
385 A and AAAA updates are done using the same 'fqdn.' virtual option space
386 (although the DHCPv4 FQDN and DHCPv6 FQDN options are formatted
387 differently, they both use the same code here).
389 - The Linux dhclient-script attempts to set and remove assigned addresses,
390 and to configure /etc/resolv.conf from nameserver and domain name
391 configurations. It can be extended to configure other parameters.
393 - Initial DHCPv6 lease support.
395 - The IO system now tracks all local IP addresses, so that the DHCP
396 applications (particularly the dhcrelay) can discern between what frames
397 were transmitted to it, and what frames are being carried through it which
398 it should not intercept.
400 Changes since 3.1.0 (Maintenance)
402 - A bug was repaired where MAC Address Affinity for virgin leases always
403 mapped to the primary. Virgin leases now have an interleaved preference
404 between primary and secondary.
406 - A bug was repaired where MAC Address Affinity for clients with no client
407 identifier was sometimes mishashed to the peer. Load balancing during
408 runtime and pool rebalancing were opposing.
410 - An assertion in lease counting relating to reserved leases was repaired.
412 - The subnet-mask option inclusion now conforms with RFC2132 section 3.3;
413 it will only appear prior to the routers option if it is present on the
414 Parameter-Request-List. The subnet-mask option will also only be
415 included by default (if it is not on the PRL) in response to DISCOVER
418 - The FQDN option is only supplied if the client supplied an FQDN option or
419 if the FQDN option was explicitly requested on the PRL.
421 - Dynamic BOOTP leases are now load balanced in failover.
423 Changes since 3.1.0rc1
425 - The parse warning that 'deny dyanmic bootp;' must be configured for
426 failover protected subnets was removed.
428 Changes since 3.1.0b2
430 - Failover rebalance events no longer play ping pong with round errors
431 (moving leases between free and back to backup where there are an
432 odd number of leases).
434 - The 'pool' log line has been split into two messages, one before the
435 rebalance run, and one after.
437 - Any queued BNDACKs are transmitted before transmitting new BNDUPDs.
438 This enforces the correct sequence of events for the remote server
439 processing these messages.
441 Changes since 3.1.0b1
443 - Fixed a bug that caused OMAPI clients to freeze when opening lease
446 - A new server config option "fqdn-reply" specifies whether the server
447 should send out option 81 (FQDN). Defaults to "on". If set to "off",
448 the FQDN option is not sent, even if the client requested it. This is
449 needed because some clients misbehave otherwise. Thanks to Christof Chen
452 - Allow trace output files (-tf option) to be overwritten, rather than
453 crashing dhcpd if the file already exists
455 - A bug was fixed that caused dhcpd to segfault if a pool was declared
456 outside the scope of a subnet in dhcpd.conf.
458 - Some uninitialized values were repaired in dhcpleasequery.c that
459 caused the server to abort.
461 - A new server config option, 'do-reverse-updates', has been added
462 which causes the server to abstain from performing updates on PTR
463 records. Thanks to a patch from Christof Chen at Allianz.
465 - A bug was repaired in subencapsulation support, where spaces separated
466 by empty spaces would not get included.
468 - A bug in dhclient was repaired which caused it to send parameter request
469 lists of 55 bytes in length no matter how long the declared PRL was.
471 - 'dhcp.c(3953): non-null pointer' has been repaired. This fixes a flaw
472 wherein the DHCPv4 server may ignore a configured server-identifier.
474 - A flaw in failover startup sequences was repaired that sometimes left
475 the primary DHCP server's pool rebalance schedules unscheduled.
477 - Corrected a flaw that broke encapsulated spaces included due to presence
478 on the parameter request list.
480 Changes since 3.1.0a3
482 - Some spelling fixes.
484 Changes since 3.1.0a2
486 - A bug was fixed where attempting to permit leasequeries results in a
487 fatal internal error, "Unable to find server option 49".
489 - A bug was fixed in dhclient rendering the textual output form of the
490 domain-search option syntax.
492 Changes since 3.1.0a1
494 - A bug in the FQDN universe that added FQDN codes to the NWIP universe's
495 hash table was repaired.
497 - The servers now try harder to transmit pending binding updates when
498 entering normal state.
500 - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
501 requeues all pending updates. This should reduce the number of spurious
502 'xid mismatch' log messages.
504 - An option definition referencing leak was fixed, which resulted in early
505 termination of dhclient upon the renewal event.
507 - Some default hash table sizes were tweaked, some upwards, some downwards.
508 3.1.0a1's tables resulted in a reduction in default server memory use.
509 The new selected values provide more of a zero sum (increasing the size
510 of tables likely to be populated, decreasing the size of tables unlikely).
512 - Lease structures appear in three separate hashes: by IP address, by UID,
513 and by hardware address. One type of table was used for all three, and
514 improvements to IP address hashing were applied to all three (so UID and
515 hardware addresses were treated like 4-byte integers). There are now two
516 types of tables, and the uid/hw hashes use functions more appropriate
519 - The max-lease-misbalance percentage no longer causes scheduled rebalance
520 runs to be skipped: it still governs the schedule, but every scheduled
521 run will attempt balance.
523 - A segfault bug in recursive encapsulation support has been corrected.
525 Changes since 3.0 (New Features)
527 - A workaround for certain STSN servers that send a mangled domain-name
528 option was introduced for dhclient. The client will now accept corrupted
529 server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
530 or NAK). The server will continue to not accept corrupt client packets.
532 - Support for 'reserved' (pseudo-static) and BOOTP leases via failover
535 - Support for adding, removing, and managing class and subclass statements
538 - The failover implementation was updated to comply with revision 12 of
541 - 'make install' now creates the initial zero-length dhcpd.leases file if
542 one does not already exist on the system.
544 - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
546 - The Load Balance Algorithm was misimplemented. The current implementation
549 - lcase() and ucase() configuration expressions have been added which adjust
550 their arguments from upper to lower and lower to upper cases respectively.
551 Thanks to a patch from Albert Herranz.
553 - The dhclient 'reject ...;' statement, which rejects leases given by named
554 server-identifiers, now permits address ranges to be specified in CIDR
555 notation. Thanks to a patch from David Boyce.
557 - The subnet-mask option is now supplied by default, but at lowest
558 priority. This helps a small minority of clients that provide parameter
559 request lists, but do not list the subnet-mask option because they were
560 designed to interoperate with a server that behaves in this manner.
562 - The FQDN option is similarly supplied even if it does not appear on the
563 parameter request list, but not to the exclusion of options that do
564 appear at the parameter request list. Up until now it had ultimate
565 priority over the client's parameter request list.
567 - Varying option space code and length bit widths (8/16/32) are now
568 supported. This is a milestone in achieving RFC 3925 "VIVSO" and
571 - A new common (server or client) option, 'db-time-format local;', has
572 been added which prints the local time in /var/db/dhcpd.leases rather
573 than UTC. Thanks to a patch from Ken Lalonde.
575 - Some patches to improve DHCP Server startup speed from Andrew Matheson
576 have been incorporated.
578 - Failover pairs now implement 'MAC Affinity' on leases moving from the
579 active to free states. Leases that belonged to the failover secondary
580 are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
581 If lease rebalancing must move leases, it tries first to move leases
582 that belong to the peer in need.
584 - The server no longer sends POOLREQ messages unless the pool is severely
585 misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
587 - Pool rebalance events no longer happen upon successfully allocating a
588 lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
589 min-balance and max-balance statements for more information.
591 - The DHCP Relay Agent Information Option / Link Selection Sub-Option
592 is now supported. (See RFC3527 for details).
594 - A new DDNS related server option, update-conflict-detection, has been
595 added. If this option is enabled, dhcpd will perform normal DHCID
596 conflict resolution (the default). If this option is disabled, it will
597 instead trust the assigned name implicitly (removing any other bindings
598 on that name). This option has not been made available in dhclient.
600 - In those cases where the DHCP software manufactures an IP header (to
601 transmit via bpf, lpf, etc), the IP TTL the software selects has been
602 increased from 16 to 128. This is intended to match Microsoft Windows
603 DHCP Client behaviour, to increase compatibility.
605 - 'ignore client-updates;' now has behaviour that is different from
606 'deny client-updates;'. The client's request is not truly ignored,
607 rather it is encouraged. Should this value be configured, the server
608 updates DNS as though client-updates were set to 'deny'. That is, it
609 enters into DNS whatever it is configured to do already, provided it is
610 configured to. Then it sends a response to the client that lets the
611 client believe it is performing client updates (which it will), probably
612 for a different name. In essence, this lets the client do as it will,
613 ignoring this aspect of their request.
615 - Support for compressed 'domain name list' style DHCP option contents, and
616 in particular the domain search option (#119) was added.
618 - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
619 LEASEQUERY lets you query the DHCP server for information about a lease,
620 using either an IP address, MAC address, or client identifier. Thanks
621 to a patch from Justin Haddad.
623 - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
624 ethernet mac address) on the SCO platform specifically without any strange
625 ifconfig hacks. Many thanks go to the Kroger Co. for donating the
626 hardware and funding the development.
628 - A new common configuration executable statement, execute(), has been
629 added. This permits dhcpd or dhclient to execute a named external
630 program with command line arguments specified from other configuration
631 language. Thanks to a patch written by Mattias Ronnblom, gotten to us
634 - A new dhcp server option 'adaptive-lease-time-threshold' has been added
635 which causes the server to substantially reduce lease-times if there are
636 few (configured percentage) remaining leases. Thanks to a patch submitted
639 - Encapsulated option spaces within encapsulated option spaces is now
642 Changes since 3.0.6rc1
644 - supersede_lease() now requeues leases in their respective hardware
645 address hash bucket. This mirrors client identifier behaviour.
649 - Assorted fixes for broken network devices: Packet length is now
650 determined from the IP header length field to finally calculate the
651 UDP payload length, because some NIC drivers return more data than
652 they actually received.
654 - UDP packets are now stored in aligned data structures.
656 - A logic error in omapi interface code was repaired that might result in
657 incorrectly indicating 'up' state when any flags were set, rather than
658 specifically the INTERFACE_REQUESTED flag. Thanks to a patch from
659 Jochen Voss which got to us via Andrew Pollock at Debian.
661 - A reference leak on binding scopes set by ddns updates was repaired.
663 - A memory leak in the minires_nsendsigned() function call was repaired.
664 Effectively, this leaked ~176 bytes per DDNS update.
666 - In the case where an "L2" DHCP Relay Agent (one that does not set giaddr)
667 was directly attached to the same broadcast domain as the DHCP server,
668 the RFC3046 relay agent information option was not being returned to the
669 relay in the server's replies. This was fixed; the dhcp server no longer
670 requires the giaddr to reply with relay agent information. Note that
671 this also improves compatibility with L2 devices that "intercept" DHCP
672 packets and expect relay agent information even in unicast (renewal)
673 replies. Thanks to a patch from Pekka Silvonen.
675 - A bug was fixed where the BOOTP header 'sname' field had a value, the
676 copy written to persistent storage was actually the contents of the
679 - A bug was fixed where the nwip virtual option space was referencing
680 the fqdn option's virtual option space's option cache.
682 - Timestamp parsing errors that indicated missing "minutes" fields rather
683 than the actually missing "seconds" fields have been repaired thanks to
684 a patch from Kevin Steves.
686 - A grammar error in the dhclient.8 manpage was repaired thanks to a patch
689 - Several spelling typos were repaired, and some cross-references to other
690 relevant documents were included in the manpages, thanks to a patch
691 by Andrew Pollock which got to us via Tomas Pospisek.
693 - Some bugs were fixed in the 'emergency relay agent options hologram'
694 which is used to retain relay agent option contents from when the
695 client was in INIT or REBIND states. This should solve problems where
696 relay agent options were not echoed from the server, even when giaddr
699 - dhclient now closes its descriptor to dhclient.leases prior to executing
700 dhclient-script. Thanks to a patch from Tomas Pospisek.
702 - The server's "by client-id" and "by hardware address" hash table lists
703 are now sorted according to the preference to re-allocate that lease to
704 returning clients. This should eliminate pool starvation problems
705 arising when "INIT" clients were given new leases rather than presently
708 Changes since 3.0.5rc1
710 - A bug was repaired in fixes to the dhclient, which sought to run the
711 dhclient-script with the 'EXPIRE' state should it receive a NAK in
712 response to a REQUEST. The client now iterates the PREINIT state
713 after the EXPIRE state, so that interfaces that might be configured
714 'down' can be brought back 'up' and initialized.
716 - DHCPINFORM handling for clients that properly set ciaddr and come to the
717 server via a relay aget has been repaired.
721 - A warning that host statements declared within subnet or shared-network
722 scopes are actually global has been added.
724 - The default minimum lease time (if min-lease-time was not specified)
725 was raised from 0 to 300. 0 is not thought to be sensible, and is
726 known to be damaging.
728 - Added additional fatal error sanity checks surrounding lease binding
729 state count calculations (free/active counts used for failover pool
732 - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
733 misapplied to server values rather than client values. The server no longer
734 advertises 8-byte lease-time options when on 64-bit platforms.
736 - A bug where leases not in ACTIVE state would get billed to billed classes
737 (classes with lease limitations) was fixed. Non-active leases OFFERed
738 to clients are no longer billed (but billing is checked before offering).
740 - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
741 configuration option - the default configuration and results should be
744 - If the dhclient were to receive a DHCPNAK while it was in the RENEW
745 state (and consequently, had an active, 'bound' address and related
746 configuration options), it would fail to 'tear down' this information
747 before proceeding into INIT state. dhclient now iterates the dhclient-
748 script with the 'EXPIRE' action to cause these teardowns prior to entering
749 INIT state. Thanks to a patch from Chris Zimmerman.
751 - The omapi.1 manpage had some formatting errors repaired thanks to a patch
752 from Yoshihiko Sarumaru.
754 - A few lines of code that were failover-specific were moved within
755 #if defined() clauses so that compilation without failover could be
758 - The log message emitted when the 'leased-address' value was not available
759 in dhcpd.conf "executable statements" has been updated to be more helpful.
760 Manpage information for this value has also been updated.
762 - Abandoned or dissociated (err condition) leases now remove any related
763 dynamic dns bindings. Thanks to a patch from Patrick Schoo.
765 - Attempting to write a new lease file to replace a corrupt (due to
766 encountering non-retryable errors during writing) lease file should
767 no longer result in an infinite recursion.
769 - Host declaration hardware addresses and client identifiers may only be
770 configured once. dhcpd will now fail to load config files that specify
771 multiple identifiers (previous versions would silently over-ride the
772 value with the later configured value).
774 - Several option codes that have been allocated since our last release
775 have been named and documented.
777 - Option names of the form "unknown-123" have been removed from the in-
778 memory hash tables. In order to support options of these names that
779 may appear in dhclient.leases or similar in previous versions, the
780 parser will now find the new option code definition, or mock up a
781 generic option code definition. This should result in a smooth
782 transition from one name to the other, as the new name is used to
785 Changes since 3.0.4rc1
787 - The dhcp-options.5 manpage was updated to correct indentation errors
788 thanks to a patch from Jean Delvare.
790 Changes since 3.0.4b3
792 - Some manual pages were clarified pursuant to discussion on the dhcp-server
795 Changes since 3.0.4b2
797 - Null-termination sensing for certain clients that unfortunately require
798 it in DHCPINFORM processing was repaired.
800 - The host-name option and a few others were moved from "X" format to "t"
801 format to be compatible with new NULL handling functions.
803 - DHCPINFORM processing is a little more careful about return addressing
804 its responses, or if responding via a relay. The INFORM related
805 messages also log the 'effective client ip address' rather than the
806 client's supplied ciaddr (since some clients produce null ciaddrs).
808 - The server was inappropriately sending leases to the RESET state in the
809 event that multiple active leases were found to match a singly-identified
810 client. This was changed to RELEASED (by accepting a different, ACTIVE
811 binding, the client is implicitly releasing its lease). This repairs a
812 bug wherein secondary servers in failover pairs detecting this condition
813 move leases to RESET, and primaries refuse to accept that state
814 transition (properly).
816 - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
818 Changes since 3.0.4b1
820 - Command line parsing in omshell was repaired - it no longer closes
821 STDIN after reading one line.
823 - The resolver library no longer closes the /etc/resolv.conf file
824 descriptor it opened twice.
826 - Changes to trailing NULL removal in 't' option-atoms has been rethought,
827 it now includes 'd' (domain name) types, and tries hard not to rewind an
828 option beyond the start of the text field it is un-terminating.
832 - A DDNS update handling function was misusing the DNS error codes, rather
833 than the internal generic result enumeration. The result is a confusing
834 syslog line, logging the wrong condition.
836 - The DHCP Server was not checking pool balance in the case where it brought
837 a non-ACTIVE lease out of storage for a client that was returning to use
838 a lease it once had long ago, and had since expired.
840 - Failover peers no longer bother to look for free leases to allocate when
841 they already found the client's ACTIVE lease. DISCOVERs are load balanced
842 whether freely-allocated or not, unless the server doubts the peer has
845 - Fixed a bug in dhcrelay agent addition code that suppressed trailing
846 PAD options - it was suppressing only one trailing PAD option, rather
847 than the entire block of them.
849 ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
850 option addition and stripping code. Added a few sanity checks. Although
851 highly improbable, due to requiring the reception of a DHCP datagram well
852 in excess of all known to be used physical MTU limitations, it is possible
853 this may have been used in a stack overflow security vulnerability. Thanks
854 to a patch from infamous42md.
856 ! Added some sanity checks to OMAPI connection/authentication code.
857 Although highly improbable, due to having to deliver in excess of 2^32
858 bytes of data via the OMAPI channel, not to mention requiring dhcpd to
859 be able to malloc() a memory region 2^32 bytes in size, it was possible
860 this might have resulted in a heap overflow security vulnerability.
861 Thanks to a patch from infamous42md.
863 - dmalloc() memset()'s the non-debug (data) portion of the allocated
864 memory to zero. Code that memset()'s the result returned by dmalloc() to
865 zero is redundant. These redundancies were removed.
867 - Some type declaration corrections to u_int16_t were made in common/tr.c
868 (Token Ring support) thanks to a patch from Jason Vas Dias at RedHat.
870 - A failover bug that was allowing leases that EXPIRED or were RELEASED
871 where tsfp and tstp are identical timestamps to languish in these
872 transitional states has been repaired. As a side effect, lease
873 databases should be kept more consistent overall, not just for these
876 - If the lease db is deleted out from under the daemon, and it moves to rewrite
877 the db, it will go ahead with the operation and move the new db into place
878 once it detects the old db does not exist.
880 - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
881 is either nonsensical or (in the case of IEEE1394) is not known to support
882 these interfaces. Thanks to Marius Gedminas and Andrew Pollock of Debian.
884 - Some previously undocumented reasons for dhclient-script invoking has
885 been documented in the dhclient-script.8 manpage.
887 - Failover potential expiry calculations (TSTP) have been corrected. Results
888 should be substantially more consistent, and proper given the constraints.
890 - Adjusted lease state validation checks in potential-conflict, to
891 account for possible clock skew similarly to normal state, and several
892 previously illegal transitions were made legal (ex: active->released).
894 - An impossible sanity check was removed from omapi/buffer.c, thanks to a
895 patch from 'infamous42md'.
897 - An OMAPI host/network byte order problem in lease time values has been
900 - Several minor bugs, largely relating to treating 8-byte time values as
901 4-byte entities, have been repaired after careful review of the FreeBSD
902 ports collection's patch set. Thanks to the nameless entities who have
903 contributed to the FreeBSD ports.
905 - When writing a trace file, the file is now created with permissions 0600,
906 to help administrators avoid accidentally publicising sensitive config
909 - The calculation of the maximum size of DHCP packets no longer includes
910 Ethernet framing overhead. The result is that the 'Maximum Message
911 Size' option advertised by clients, or the default value 576, is no
912 longer reduced by 14 bytes, and instead directly reflects the IP level
913 MTU (and the default, minimum allowed IP MTU of 576).
915 - The special status of RELEASED/EXPIRED/RESET leases when a server
916 is operating in partner-down was fixed. It no longer requires a
917 lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
918 event to turn these into FREE leases without peer acknowledgement
919 (after STOS+MCLT) has been repaired.
921 - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
924 - "append"ing a string onto the end of a "t" type option (such as the
925 domain-name field) that had been improperly NULL-terminated by the
926 DHCP server will no longer result in a truncated string containing
927 only the option from the server, and not the expected appended value.
928 Thanks to a patch from Jason Vas Dias at RedHat.
930 - File handlers on configuration state (config files and lease dbs) should
931 be treated consistently, regardless of whether TRACING is defined or not.
933 - The Linux build environment has had some minor improvements - better
934 sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
935 and corrections to #if operators regarding LINUX_MAJOR should it ever
938 - The server now tries harder to survive the condition where it is unable
939 to open a new lease file to rewrite the lease state database.
941 Changes since 3.0.3b3
943 - dhclient.conf documentation for interface {} was updated to reflect recent
944 discussion on the dhcp-hackers mailing list.
946 - In response to reports that the software does not compile on GCC 4.0.0,
947 -Werror was removed from Makefile.conf for all platforms that used it.
948 We will address the true problem in a future release; this is a temporary
951 Changes since 3.0.3b2
953 - An error in code changes introduced in 3.0.3b2 was corrected, which caused
954 static BOOTP clients to receive random addresses.
956 Changes since 3.0.3b1
958 - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
959 host records would be left behind on leases that were not allocated to the
960 client currently booting (eg in the case where the host was denied booting).
962 - The dhcpd.conf.5 manpage was updated to be more clear in regards to
963 multiple host declarations (thanks to Vincent McIntyre). 'Interim' style
964 dynamic updates were also retouched.
968 - A bug was fixed where a server might load balance a DHCP REQUEST to its
969 peer after already choosing not to load balance the preceding DISCOVER.
970 The peer cannot allocate the originating server's lease.
972 - In the case where a secondary server lost its stable storage while the
973 primary was still in communications-interrupted, and came back online,
974 the lease databases would not be fully transferred to the secondary.
975 This was due to the secondary errantly sending an extra UPDREQ message
976 when the primary made its state transition to PARTNER-DOWN known.
978 - The package will now compile cleanly in gcc 3.3 and 3.4. As a side effect,
979 lease structures will be 9 bytes smaller on all platforms. Thanks to
980 Jason Vas Dias at Redhat.
982 - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
983 properly restricted to only detecting broadcast interfaces. Thanks
984 to a patch from Jason Vas Dias at RedHat.
986 - decode_udp_ip_header was changed so that the IP address was copied out
987 to a variable, rather than referenced by a pointer. This enforces 4-byte
988 alignment of the 32-bit IP address value. Thanks to a patch from Dr.
991 - An incorrect log message was corrected thanks to a patch from
994 - A bug in DDNS was repaired, where if the server's first DDNS action was
995 a DDNS removal rather than a DDNS update, the resolver library's
996 retransmit timer and retry timer was set to the default, implying a
997 15 second timeout interval. Which is a little excessive in a synchronous,
998 single-threaded system. In all cases, ISC DHCP should now hold fast to
999 a 1-second timeout, trying only once.
1001 - The siaddr field was being improperly set to the server-identifier when
1002 responding to DHCP messages. RFC2131 clarified the siaddr field as
1003 meaning the 'next server in the bootstrap process', eg a tftp server.
1004 The siaddr field is now left zeroed unless next-server is configured.
1006 - mockup_lease() could have returned in an error condition (or in the
1007 condition where no fixed-address was found matching the shared
1008 network) with stale references to a host record. This is probably not
1009 a memory leak since host records generally never die anyway.
1011 - A bug was repaired where failover servers would let stale client identifiers
1012 persist on leases that were reallocated to new clients not sending an id.
1014 - Binding scopes ("set var = value;") are now removed from leases allocated
1015 by failover peers if the lease had expired. This should help reduce the
1016 number of stale binding scopes on leases.
1018 - A small memory leak was closed involving client identifiers larger than
1019 7 bytes, and failover.
1021 - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
1022 cause an internal function to overflow heap. Thanks to Jason Vas Dias
1025 - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
1026 or 'NUMBER_OR_NAME' was repaired. Hexadecimal parsing is affected, and
1029 - In several cases, parse warnings were being issued before the lexical
1030 token had been advanced to the token whose value was causing an error...
1031 causing parse warnings to claim the problem is on the wrong token.
1033 - Host declarations matching on client identifier for dynamic leases will
1034 no longer match fixed-address host declarations (this is now identical
1035 to behaviour for host records matching on hardware address).
1037 Changes since 3.0.2rc3
1039 - A previously undocumented configuration directive, 'local-address',
1040 was documented in the dhcpd.conf manpage.
1042 Changes since 3.0.2rc2
1044 - Two variables introduced in 3.0.2b1 were used without being initialized
1045 in the case where neither the FILE nor SNAME fields were available for
1046 overloading. This was repaired.
1048 - A heretofore believed to be impossible corner case of the option
1049 overloading implementation turned out to be possible ("Unable to sort
1050 overloaded options after 10 tries."). The implementation was reworked
1051 to consider the case of an option so large it would require more than
1052 three chunks to fit.
1054 - Many other instances of variables being used without being initialized
1057 - An uninitialized variable in omapi_io_destroy() led to the discovery
1058 that this function may result in orphaned pointers (and hence, a memory
1061 Changes since 3.0.2rc1
1063 - allocate_lease() was rewritten to repair a bug in which the server would
1064 try to allocate an ABANDONED lease when FREE leases were available.
1066 Changes since 3.0.2b1
1068 - Some dhcp-eval.5 manpage formatting was repaired.
1072 - A bug was fixed in the server's 'option overloading' implementation,
1073 where options loaded into the 'file' and 'sname' packet fields were
1074 not aligned precisely as rfc2131 dictates.
1076 - The FreeBSD client script was changed to support the case where a domain
1077 name was not provided by the server.
1079 - A memory leak in 'omshell' per each command line parsed was
1080 repaired, thanks to a patch from Jarkko Torppa.
1082 - Log functions writing to stderr were adjusted to use the STDERR_FILENO
1083 system definition rather than '2'. This is a no-op for 90% of platforms.
1085 - One call to trace_write_packet_iov() counted the number of io vectors
1086 incorrectly, causing inconsistent tracefiles. This was fixed.
1088 - Some expression parse failure memory leaks were closed.
1090 - A host byte order problem in tracefiles was repaired.
1092 - Pools configured in DHCPD for failover possessing permission lists that
1093 previously were assumed to not include dyanmic bootp clients are now
1094 a little more pessimistic. The result is, dhcpd will nag you about just
1095 about most pools that possess a 'allow' statement with no 'deny' that
1096 would definitely match a dynamic bootp client.
1098 - The 'ddns-update-style' configuration warning bit now insists that
1099 the configuration be globally scoped.
1101 - Two memory leaks in dhclient were closed thanks to a patch from Felix
1104 - Some minor but excellently pedantic documentation errors were fixed
1105 thanks to a patch from Thomas Klausner.
1107 - Bugs in operator precedence in executable statements have been repaired
1108 once again. More legal syntaxes should be parsed legally.
1110 - Failing to initialize a tracefile for any reason if a tracefile was
1111 specified is now a fatal error. Thanks to a patch from Albert Herranz.
1113 - Corrected a bug in which the number of leases transferred as calculated
1114 by the failover primary and sent to peers in POOLRESP responses may be
1115 incorrect. This value is not believed to be used by other failover
1116 implementations, excepting perhaps as logged information.
1118 - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
1119 sending POOLREQ messages instead of POOLRESP mesasges. This message
1120 was essentially ignored since failover secondaries effectively do not
1121 respond to POOLREQ messages.
1123 - Type definitions for various bitwidths of integers in the sunos5-5
1124 build of ISC DHCP have been fixed. It should compile and run more
1125 easily when built in 64-bit for this platform.
1127 - "allow known-clients;" is now a legal syntax, to avoid confusion.
1129 - If one dhcp server chooses to 'load balance' a request to its failover
1130 peer, it first checks to see if it believes said peer has a free
1131 lease to allocate before ignoring the DISCOVER.
1133 - log() was logging a work buffer, rather than the value returned by
1134 executing the statements configured by the user. In some cases,
1135 the work buffer and the intended results were the same. In some other
1136 cases, they were not. This was fixed thanks to a patch from Gunnar
1137 Fjone and directconnect.no.
1139 - Compiler warnings for some string type conversions was fixed, thanks
1140 to Andreas Gustafsson.
1142 - The netbsd build environments were simplified to one, in which
1143 -Wconversion is not used, thanks to Andreas Gustafsson.
1145 - How randomness in the backoff-cutoff dhclient configuration variable
1146 is implemented was better documented in the manpage, and the behaviour
1147 of dhclient in REQUEST timeout handling was changed to match that of
1148 DISCOVER timeout handling.
1150 - Omapi was hardened against clients that pass in null values, thanks
1151 to a patch from Mark Jason Dominus.
1153 - A bug was fixed in dhclient that kept it from doing client-side
1154 ddns updates. Thanks to a patch from Andreas Gustafsson, which
1155 underwent some modification after review by Jason Vas Dias.
1157 - Failover implementations disconnected due to the network between
1158 them (rather than one of the two shutting down) will now try to
1159 re-establish the failover connection every 5 seconds, rather than
1160 to simply try once and give up until one of them is restarted.
1161 Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
1162 by Greger V. Teigre which led to an enhancement to it.
1164 - A problem that kept DHCP Failover secondaries from tearing down
1165 ddns records was repaired. Thanks to a patch from Ulf Ekberg from
1168 - 64bit pointer sizes are detected properly on FreeBSD now.
1170 - A bug was repaired where the DHCP server would leave stale references
1171 to host records on leases it once thought about offering to certain
1172 clients. The result would be to apply host and 'known' scopes to the
1173 wrong clients (possibly denying booting). NOTE: The 'mis-host' patch
1174 that was being circulated as a workaround is not the way this bug was
1175 fixed. If you were a victim of this bug in 3.0.1, you are cautioned
1176 to proceed carefully and see if it fixes your problem.
1178 - A bug was repaired in the server's DHCPINFORM handling, where it
1179 tried to divine the client's address from the source packet and
1180 would get it wrong. Thanks to Anshuman Singh Rawat.
1182 - A log message was introduced to help illuminate the case where the
1183 server was unable to find a lease to assign to any BOOTP client.
1184 Thanks to Daniel Baker.
1186 - A minor dhcpd.conf.5 manpage error was fixed.
1188 Changes since 3.0.1rc14
1190 - The global variable 'cur_time' was centralized and is now uniformly of a
1191 type #defined in system-dependent headers. It had previously been defined
1192 in one of many places as a 32-bit value, and this causes mayhem on 64-bit
1193 big endian systems. It probably wasn't too healthy on little endian
1196 - A printf format string error introduced in rc14 was repaired.
1198 - AIX system-dependent header file was altered to only define NO_SNPRINTF
1199 if the condition used to #ifdef in vsnprintf in AIX' header files
1202 - The Alpha/OSF system-dependent header file was altered to define
1203 NO_SNPRINTF on OS revisions older than 4.0G.
1205 - omapip/test.c had string.h added to its includes.
1207 Changes since 3.0.1rc13
1209 ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
1210 in logging messages with excessively long hostnames provided by the
1211 clients. It is highly probable that these could have been used by
1212 attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
1213 release candidates 12 or 13. Special thanks to Gregory Duchemin for
1214 both finding and solving the problem.
1216 ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
1217 in log_*() functions was evidenced, on some specific platforms where
1218 vsnprintf() was not believed to be available and calls were wrapped to
1219 sprintf() instead. Again, credit goes to Gregory Duchemin for finding
1220 the problem. Calls to snprintf() are now linked to a distribution-local
1221 snprintf implementation, only in those cases where the architecture is
1222 not known to provide one (see includes/cf/[arch].h). If you experience
1223 linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
1224 is where to look. This vulnerability did not exist in any previously
1225 published version of ISC DHCP.
1227 - Compilation on hpux 11.11 was repaired.
1229 - 'The cross-compile bug fix' was backed out.
1231 Changes since 3.0.1rc12
1233 - Fixed a bug in omapi lease lookup function, to form the hardware
1234 address for the hash lookup correctly, thanks to a patch from
1237 - Fixed a bug where dhcrelay was sending relayed responses back to the
1238 broadcast address, but with the source's unicast mac address. Should
1239 now conform to rfc2131 section 4.1.
1241 - Cross-compile bug fix; use $(AR) instead of ar. Thanks to Morten Brorup.
1243 - Fixed a crash bug in dhclient where dhcpd servers that do not provide
1244 renewal times results in an FPE. As a side effect, dhclient can now
1245 properly handle 0xFFFFFFFF (-1) expiry times supplied by servers. Thanks
1246 to a patch from Burt Silverman.
1248 - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
1249 and reformatted to correct a compilation error on Solaris platforms.
1251 - A patch was applied which fixes a case where leases read from the
1252 leases database do not properly over-ride previously read leases.
1254 - dhcpctl.3 manpage was tweaked.
1256 Changes since 3.0.1rc11
1258 - A patch from Steve Campbell was applied with minor modifications to
1259 permit reverse dns PTR record updates with values containing spaces.
1261 - A patch from Florian Lohoff was applied with some modifications to
1262 dhcrelay. It now discards packets whose hop count exceeds 10 by default,
1263 and a command-line option (-c) can be used to set this threshold.
1265 - A failover bug relating to identifying peers by name length instead of
1268 - Declaring failover configs within shared-network statements should no
1269 longer result in error.
1271 - The -nw command line option to dhclient now works.
1273 - Thanks to a patch from Michael Richardson:
1274 - Some problems with long option processing have been fixed.
1275 - Some fixes to minires so that updates of KEY records will work.
1277 - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
1278 see contrib/ms2isc/readme.txt for revision notes.
1280 - Dhclient no longer uses shell commands to kill another instance of
1281 itself, it sends the signal directly. Thanks to a patch from Martin
1284 - The FreeBSD dhclient-script was changed so that a failure to write to
1285 /etc/resolv.conf does not prematurely end the script. This keeps dhclient
1286 from looping infinitely when this is the case. Thanks to a patch from
1289 - A patch from Bill Stephens was applied which resolves a problem with lease
1290 expiry times in failover configurations.
1292 - A memory leak in configuration parsing was closed thanks to a patch from
1295 - The function which discovers interfaces will now skip non-broadcast or
1296 point-to-point interfaces, thanks to a patch from David Brownlee.
1298 - Options not yet known by the dhcpd or dhclient have had their names
1299 changed such that they do not contain # symbols, in case they should ever
1300 appear in a lease file. An option that might have been named "#144" is
1303 - Another patch from Bill Stephens which allows the ping-check timeout to
1304 be configured as 'ping-timeout'. Defaults to 1.
1306 Changes since 3.0.1rc10
1308 - Potential buffer overflows in minires repaired.
1310 - A change to the linux client script to use /bin/bash, since /bin/sh may
1313 - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
1315 - A correction of boolean parsing syntax validation - some illegal syntaxes
1316 that worked before are now detected and produce errs, some legal syntaxes
1317 that errored before will now work properly.
1319 - Some search-and-replace errors that caused some options to change their
1322 - Shu-min Chang of the Intel corporation has contributed a perl script and
1323 module that converts the MS NT4 DHCP configuration to a ISC DHCP3
1326 - Applied the remainder of the dhcpctl memory leak patch provided by Bill
1327 Squier at ReefEdge, Inc. (groo@reefedge.com).
1329 - Missing non-optional failover peer configurations will now result in a soft
1330 error rather than a null dereference.
1332 Changes since 3.0.1rc9
1334 - A format string was corrected to fix compiler warnings.
1336 - A number of spelling corrections were made in the man pages.
1338 - The dhclient.conf.5 man page was changed to refer to do-forward-updates
1339 rather than a configuration option that doesn't exist.
1341 - A FreeBSD-specific bug in the interface removal handling was fixed.
1343 - A Linux-specific Token Ring detection problem was fixed.
1345 - Hashes removed from as-yet-unknown agent options, having those options
1346 appear in reality before we know about them will no longer produce
1347 self-corrupting lease databases.
1349 - dhclient will use the proper port numbers now when using the -g option.
1351 - A order-of-operations bug with 2 match clauses in 1 class statement is
1352 fixed thanks to a patch from Andrew Matheson.
1354 - Compilation problems on Solaris were fixed.
1356 - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
1358 - A fix to the dhcp ack process which makes certain group options will be
1359 included in the first DHCPOFFER message was made thanks to a patch from
1362 - A few memory leaks were repaired thanks to patches from Bill Squier at
1363 ReefEdge, Inc. (groo@reefedge.com).
1365 - A fix for shared-networks that sometimes give clients options for the
1366 wrong subnets (in particular, 'option routers') was applied, thanks to
1367 Ted Lemon for the patch.
1369 - Omshell's handling of dotted octets as values was changed such that dots
1370 one after the other produce zero values in the integer string.
1372 Changes since 3.0.1rc8
1374 - Fix a format string vulnerability in the server that could lead to a
1375 remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
1377 - Add additional support for NetBSD/sparc64.
1379 - Fix a bug in the command-line parsing of the client. Also, resolve
1382 - Add better support for shells other than bash in the Linux client
1385 - Various build fixes for modern versions of FreeBSD and Linux.
1387 - Fix a bad bounds check when printing binding state names.
1389 - Clarify documentation about fixed-address and multiple addresses.
1391 - Fix a typo in the authoritative error message.
1393 - Make a log entry when we can't write a billing class.
1395 - Use conversion targets that are the right size on all architectures.
1397 - Increment the hop count when relaying.
1399 - Log a message when lease state is changed through OMAPI.
1401 - Don't rerun the shared_network when evaluating the pool.
1403 - Fix a reversed test in the parser.
1405 - Change the type of rbuf_max.
1407 - Make FTS_LAST a manifest constant to quiet warnings.
1409 Changes since 3.0.1rc7
1411 - Fix two compiler warnings that are generated when compiling on Solaris
1412 with gcc. These stop the build, even though they weren't actually
1413 errors, because we prefer that our builds generate no warnings.
1415 Changes since 3.0.1rc6
1417 - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
1420 - Implement lease stealing for cases where the primary has fewer leases
1421 than the secondary, as called for by the standard.
1423 - Add a fudge factor to the lease expiry acceptance code, (suggested
1424 by Kevin Miller of CMU).
1426 - Fix a bug in permit_list_match that made it much too willing to say
1427 that two permit lists matched.
1429 - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
1430 also more compact) messages about DNS updates.
1432 - Fix a bug in generating wire-format domain names for the FQDN option.
1434 - Fix a bug where the FQDN option would not be returned if the client
1435 requested it, contrary to the standard.
1437 - On Darwin, use the FreeBSD DHCP client script.
1439 - On NetBSD/sparc, don't check for casting warnings.
1441 - Add a flag in the DHCP client to disable updating the client's A
1442 record when sending an FQDN option indicating that the client is
1443 going to update its A record.
1445 - In the client, don't attempt a DNS update until one second after
1446 configuring the new IP address, and if the update times out, keep
1447 trying until a response, positive or negative, is received from the
1450 - Fix an uninitialized memory bug in the DHCP client.
1452 - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
1454 - Fix a bug in ns_parserr(), where it was returning the wrong sort
1455 of result code in some cases (suggested by Ben Harris of the
1458 - Fix a bug in is_identifier(), where it was checking against EOF
1459 instead of the END_OF_FILE token (also suggested by Ben Harris).
1461 - Fix a bug where if an option universe contained no options, the
1462 DHCP server could dump core (Walter Steiner).
1464 - Fix a bug in the handling of encapsulated options.
1466 - Fix a bug that prevented NWIP suboptions from being processed.
1468 - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
1469 as modifier flags to the FTS_ACTIVE state, as called for in the
1470 failover protocol standard.
1472 - Fix bugs in the pool merging code that resulted in references and
1473 dereferences of null pointers. This bug had no impact unless the
1474 POINTER_DEBUG flag was defined.
1476 - In the server, added a do-forward-updates flag that can be used to
1477 disable forward updates in all cases, so that sites that want the
1478 clients to take sole responsibility for updating their A record can
1481 - Make it possible to disable optimization of PTR record updates.
1483 Changes since 3.0.1rc5
1485 - Include some new documentation and changes provided by Karl Auer.
1487 - Add a workaround for some Lexmark printers that send a double-NUL-
1488 terminated host-name option, which would break DNS updates.
1490 - Fix an off-by-one error in the MAC-address checking code for
1491 DHCPRELEASE that was added in 3.0.1rc5.
1493 - Fix a bug where client-specific information was not being discarded
1494 from the lease when it expired or was released, resulting in
1495 problems if the lease was reallocated to a different client.
1497 - If more than one allocation pool is specified that has the same set
1498 of constraints as another allocation pool on the same shared
1499 network, merge the two pools.
1501 - Don't print an error in fallback_discard, since this just causes
1502 confusion and does not appear to be helping to encourage anyone to
1505 Changes since 3.0.1rc4
1507 - Fix a bug that would cause the DHCP server to spin if asked to parse
1508 a certain kind of incorrect statement.
1510 - Fix a related bug that would prevent an error from being reported in
1513 - Additional documentation.
1515 - Make sure that the hardware address matches the lease when
1516 processing a DHCPRELEASE message.
1518 Changes since 3.0.1rc3
1520 - A minor bug fix in the arguments to a logging function call.
1521 - Documentation update for dhcpd.conf.
1523 Changes since 3.0.1rc2
1525 - Allow the primary to send a POOLREQ message. This isn't what the current
1526 failover draft says to do, so we may have to back it out if I can't get the
1527 authors to relent, but the scheme for balancing that's specified in the
1528 current draft seems needlessly hairy, so I'm floating a trial balloon.
1529 The rc1 code did not implement the method described in the draft either.
1531 Changes since 3.0.1rc1
1533 - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
1534 domain or RRSET. This allows the DHCP server to forget about a name
1535 it added to the DNS once it's been removed, even if the DHCP server
1536 wasn't the one that removed it.
1538 - Install defaults for failover maximum outstanding updates and maximum
1539 silent time. This prevents problems that might occur if these values
1540 were not configured.
1542 - Don't do DDNS deletes if ddns-update-style is none.
1544 - Return relay agent information options in DHCPNAK. This prevents DHCPNAK
1545 messages from being dropped when the relay agent information option contains
1546 routing information.
1548 - Fix a problem where coming up in recover wouldn't result in an update
1551 - Add some more chatty messages when we start a recovery update and when it's
1554 - Fix a possible problem where some state might have been left around
1555 after the peer lost contact and regained contact about how many updates
1558 - Don't nix a lease update because of a lease conflict. This test has
1559 never (as far as I know) prevented a mistake, and it appears to cause
1560 problems with failover.
1562 - Add support in rc history code for keeping a selective history, rather
1563 than a history of all references and dereferences. This code is only used
1564 when extensive additional debugging is enabled.
1568 - Make allocators for hash tables. As a side effect, this fixes a memory
1569 smash in the subclass allocation code.
1571 - Fix a small bug in omshell where if you try to close an object when
1572 no object is open, it dumps core.
1574 - Fix an obscure coredump that could occur on shutdown.
1576 - Fix a bug in the recording of host declaration rubouts in the lease file.
1578 - Fix two potential spins in the host deletion code.
1580 - Fix a core dump that would happen if an application tried to update
1581 a host object attribute with a null value.
1583 Changes since 3.0 Release Candidate 12
1585 - Fix a memory leak in the evaluation code.
1587 - Fix an obscure core dump.
1589 - Print a couple of new warnings when parsing the configuration file
1590 when crucial information is left out.
1592 - Log "no free leases" as an error.
1594 - Documentation updates.
1596 Changes since 3.0 Release Candidate 11
1598 - Always return a subnet selection option if one is sent.
1600 - Fix a warning that was being printed because an automatic data
1601 structure wasn't zeroed.
1603 - Fix some failover state transitions that were being handled
1606 - When supersede_lease is called on a lease whose end time has already
1607 expired, but for which a state transition has not yet been done, do
1608 a state transition. This fixes the case where if the secondary
1609 allocated a lease to a client and the lease "expired" while the
1610 secondary was in partner-down, no expiry event would actually
1611 happen, so the lease would remain active until the primary was
1614 Changes since 3.0 Release Candidate 10
1616 - Fix a bug that was preventing released leases from changing state
1617 in failover-enabled pools.
1619 - Fix a core dump in the client identifier finder code (for host
1622 - Finish fixing a bug where bogus data would sometimes get logged to
1623 the dhclient.leases file because it was opened as descriptor 2.
1625 - Fix the Linux dhclient-script according to suggestions made by
1626 several people on the dhcp-client mailing list.
1628 - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
1630 - Print an error message and refuse to run if a failover peer is
1631 defined but not referenced by any pools.
1633 - Correct a confusing error message in failover.
1635 Changes since 3.0 Release Candidate 9
1637 - Fix a bug in lease allocation for Dynamic BOOTP clients.
1639 Changes since 3.0 Release Candidate 8 Patchlevel 2
1641 - Fix a bug that prevented update-static-leases from working.
1643 - Document failover-state OMAPI object.
1645 - Fix a compilation error on SunOS 4.
1647 Changes since 3.0 Release Candidate 8 Patchlevel 1
1649 - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
1650 This was introduced in rc8pl1 as an unintended result of the memory
1651 leakage fixes that were in pl1.
1653 - Fix a long-standing bug where the server would record that an update
1654 had been done for a client with no name, even though no update had
1655 been done, and then when the client's lease expired the deletion of
1656 that nonexistant record would time out because the name was the null
1659 - Clean up the omshell, dhcpctl and omapi man pages a bit.
1661 Changes since 3.0 Release Candidate 8
1663 - Fix a bug that could cause the DHCP server to spin if
1664 one-lease-per-client was enabled.
1666 - Fix a bug that was causing core dumps on BSD/os in the presence of
1669 - In partner-down state, don't restrict lease lengths to MCLT.
1671 - On the failover secondary, record the MCLT received from the primary
1672 so that if we come up without a connection to the primary we don't
1673 wind up giving out zero-length leases.
1675 - Fix some compilation problems on BSD/os.
1677 - Fix a bunch of memory leaks.
1679 - Fix a couple of bugs in the option printer.
1681 - Fix an obscure error reporting bug in the dns update code, and also
1682 make the message clearer when a key algorithm isn't supported.
1684 - Fix a bug in the tracing code that prevented trace runs that used
1685 tcp connections from being played back.
1687 - Add some additional debugging capability for catching memory leaks
1690 - Make the client release the lease correctly on shutdown.
1692 - Add some configurability to the build system.
1694 - Install omshell manual page in man1, not man8.
1696 - Craig Gwydir sent in a patch that fixes a long-standing bug in the
1697 DHCP client that could cause core dumps, but that for some reason
1698 hadn't been noticed until now.
1700 Changes since 3.0 Release Candidate 7
1702 - Fix a bug in failover where we weren't sending updates after a
1703 transition from communications-interrupted to normal.
1705 - Handle expired/released/reset -> free transition according to the
1706 protocol specification (this works - the other way not only wasn't
1707 conformant, but also didn't work).
1709 - Add a control object in both client and server that allows either
1710 daemon to be shut down cleanly.
1712 - When writing a lease, if we run out of disk space, shut down the
1713 output file and insist on writing a new one before proceeding.
1715 - In the server, if the OMAPI listener port is occupied, keep trying
1716 to get it, rather than simply giving up and exiting.
1718 - Support fetching variables from leases and also updating and adding
1719 variables to leases via OMAPI.
1721 - If two failover peers have wildly different clocks, refuse to start
1724 - Fix a bug in the DNS update code that could cause core dumps when
1725 running on alpha processors.
1727 - Fixed a bug in ddns updates for static lease entries, thanks to a
1728 patch from Andrey M Linkevitch.
1730 - Add support for Darwin/MacOS X
1732 - Install omshell (including new documentation).
1734 - Support DNS updates in the client (this is a very obscure feature
1735 that most DHCP client users probably will not be able to use).
1737 - Somewhat cleaner status logging in the client.
1739 - Make OMAPI key naming syntax compatible with the way keys are
1740 actually named (key names are domain names).
1742 - Fix a bug in the lease file writer.
1744 - Install DHCP ISC headers in a different place than BIND 9 ISC
1745 headers, to avoid causing trouble in BIND 9 builds.
1747 - Don't send updates for attributes on an object when the attributes
1748 haven't changed. Support deleting attributes on remote objects.
1750 - Fix a number of bugs in omshell, and add the unset and refresh
1753 - Handle disconnects in OMAPI a little bit more intelligently (so that
1754 the caller gets ECONNRESET instead of EINVAL).
1756 - Fix a bunch of bugs in the handling of clients that have existing
1757 leases when the try to renew their leases while failover is
1760 Changes since 3.0 Release Candidate 6
1762 - Fix a core dump that could happen when processing a DHCPREQUEST from
1763 a client that had a host declaration that contained both a
1764 fixed-address declaration and a dhcp-client-identifier option
1765 declaration, if the client identifier was longer than nine bytes.
1767 - Fix a memory leak that could happen in certain obscure cases when
1768 using omapi to manipulate leases.
1770 - Fix some bugs and omissions in omshell.
1773 Changes since 3.0 Release Candidate 5
1775 - Fix a bug in omapi_object_dereference that prevented objects in
1776 chains from having their reference counts decreased on dereference.
1778 - Fix a bug in omapi_object_dereference that would prevent object
1779 chains from being freed upon removal of the last reference external
1782 - Fix a number of other memory leaks in the OMAPI protocol subsystem.
1784 - Add code in the OMAPI protocol handler to trace memory leakage.
1786 - Clean up the memory allocation/reference history printer.
1788 - Support input of dotted quads and colon-separated hex lists as
1789 attribute values in omshell.
1791 - Fix a typo in the Linux interface discovery code.
1793 - Conditionalize a piece of trace code that wasn't conditional.
1795 Changes since 3.0 Release Candidate 4
1797 - Fix a bug that would prevent leases from being abandoned properly on
1800 - Fix failover peer OMAPI support.
1802 - In failover, correctly handle expiration of leases. Previously,
1803 leases would never be reclaimed because they couldn't make the
1804 transition from EXPIRED to FREE.
1806 - Fix some broken failover state transitions.
1808 - Documentation fixes.
1810 - Take out an unnecessary check in DHCP relay agent information option
1811 stashing code that was preventing REBINDING clients from rebinding.
1813 - Prevent failover peers from allocating leases in DHCPREQUEST
1814 processing if the lease belongs to the other server.
1816 - Record server version in lease file introductory comment.
1818 - Correctly report connection errors in OMAPI and failover.
1820 - Make authentication signature algorithm name comparisons in OMAPI
1823 - Fix compile problem on SunOS 4.x
1825 - If a signature algorithm is not terminated with '.', terminate it so
1826 that comparisons between fully-qualified names will work
1829 - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
1830 systems with the probe not working correctly.
1832 - Don't allow user to type omapi key on command line of omshell.
1834 Changes since 3.0 Release Candidate 3
1836 - Do lease billing on startup in a way that I *think* will finally do
1837 the billing correctly - the previous method could overbill as a
1838 result of duplicate leases.
1840 - Document OMAPI server objects.
1842 Changes since 3.0 Release Candidate 2 Patchlevel 1
1844 - Fix some problems in the DDNS update code. Thanks to Albert
1845 Herranz for figuring out the main problem.
1847 - Fix some reference counting errors on host entries that were causing
1850 - Fix a byte-swap bug in the token ring code, thanks to Jochen
1853 - Fix a bug in lease billing, thanks to Jonas Bulow.
1855 Changes since 3.0 Release Candidate 2
1857 - Change the conditions under which a DHCPRELEASE is actually
1858 committed to be consistent with lease binding states rather than
1859 using the lease end time. This may fix some problems with the
1862 - Fix a bug where lease updates would fail on Digital Unix (and maybe
1863 others) because malloc was called with a size of zero.
1865 - Fix a core dump that happens when the DHCP server can't create its
1868 Changes since 3.0 Release Candidate 1 Patchlevel 1
1870 - Fix the dhcp_failover_put_message to not attempt to allocate a
1871 zero-length buffer. Some versions of malloc() fail if you try to
1872 allocate a zero-length buffer, and this was causing problems on,
1875 - Fix a case where the failover code was printing an error message
1876 when no error had occurred.
1878 - Fix a problem where when a server went down and back up again, the
1879 peer would not see a state transition and so would stay in the
1880 non-communicating state.
1882 - Be smart about going into recover_wait.
1884 - Fix a problem in the failover implementation where peers would fail
1885 to come into sync if interrupted in the RECOVER state. This could
1886 have been the cause of some problems people have reported recently.
1888 - Fix a problem with billing classes where they would not be unbilled
1889 when the client lease expired.
1891 - If select fails, figure out which descriptor is bad, and cut it out
1892 of the I/O loop. This prevents a potentially nasty spin. I
1893 haven't heard any report it in a while, but it came up consistently
1896 - Fix a bug in the relay agent where if you specified interfaces on
1897 the command line, it would fail.
1899 - Fix a couple of small bugs in the omapi connection object (no known
1902 - Add the missing 3.0 Beta 1 lease conversion script.
1904 - Read dhcp client script hooks if they exist, rather than only if
1907 Changes since 3.0 Release Candidate 1
1909 - Fix a memory smash that happens when fixed-address leases are used.
1910 ANY SITE AT WHICH FIXED-ADDRESS STATEMENTS ARE BEING USED SHOULD
1911 UPGRADE IMMEDIATELY. This has been a long-standing bug - thanks to
1912 Alvise Nobile for discovering it and helping me to find it!
1914 - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
1917 - There is a known problem with the DHCP server doing failover on
1918 Compaq Alpha systems. This patchlevel is not a release candidate
1919 because of this bug. The bug should be straightforward to fix, so
1920 a new release candidate is expected shortly.
1922 - There is a known problem in the DDNS update code that is probably a
1923 bug, and is not, as far as we know, fixed in this patchlevel.
1925 Changes since 3.0 Beta 2 Patchlevel 24
1927 - Went over problematic failover state transitions and made them all
1928 work, so that failover should now much less fragile.
1930 - Add some dhcpctl and omapi documentation
1932 - Fix compile errors when compiling with unusual predefines.
1934 - Make Token Ring work on Linux 2.4
1936 - Fix the Digital Unix BPF_WORDALIGN bug.
1938 - Fix some dhcp client documentation errors.
1940 - Update some parts of the README file.
1942 - Support GCC on SCO.
1944 Changes since 3.0 Beta 2 Patchlevel 23
1946 - Fix a bug in the DNS update code where a status code was not being
1947 checked. This may have been causing core dumps.
1949 - When parsing the lease file, if a lease declaration includes a
1950 billing class statement, and the lease already has a billing class,
1951 unbill the old class.
1953 - When processing failover transactions, where acks will be deferred,
1954 process the state transition immediately.
1956 - Don't try to use the new SIOCGIFCONF buffer size detection code on
1957 Linux 2.0, which doesn't provide this functionality.
1959 - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
1961 - Fix a problem in using the which command in the configure script.
1963 - Fix a parse error in the client when setting up an omapi listener.
1965 - Document the -n and -g flags to the client.
1967 - Make sure there is always a stdin and stdout on startup. This
1968 prevents shell scripts from accidentally writing error messages into
1969 configuration files that happen to be opened as stderr.
1971 - If an interface is removed, the client will now notice that it is
1972 gone rather than spinning. This has only been tested on NetBSD.
1974 - The client will attempt to get an address even if it can't create a
1977 - Don't overwrite tracefiles.
1979 - Fix some memory allocation bugs in failover.
1981 Changes since 3.0 Beta 2 Patchlevel 22
1983 - Apply some patches suggested by Cyrille Lefevre, who is maintaining
1984 the FreeBSD ISC DHCP Distribution port.
1986 - Fix a core dump in DHCPRELEASE.
1988 Changes since 3.0 Beta 2 Patchlevel 21
1990 - This time for sure: fix the spin described in the changes for pl20.
1992 Changes since 3.0 Beta 2 Patchlevel 20
1994 - Fix a problem with Linux detecting large numbers of interfaces (Ben)
1996 - Fix a memory smash in the quotify code, which was introduced in
1999 - Actually fix the spin described in the changes for pl20. The
2000 previous fix only partially fixed the problem - enough to get it
2001 past the regression test.
2003 Changes since 3.0 Beta 2 Patchlevel 19
2005 - Fix a bug that could cause the server to abort if compiled with
2006 POINTER_DEBUG enabled.
2008 - Fix a bug that could cause the server to spin when responding to a
2011 - Apply Joost Mulders' suggested patches for DLPI on x86.
2013 - Support NUL characters in quoted strings.
2015 - Install unformatted man pages on SunOS.
2017 Changes since 3.0 Beta 2 Patchlevel 18
2019 - Allow the server to be placed in partner-down state using OMAPI.
2022 - Implement omshell, which can be used to do arbitrary things to the
2023 server (in theory). (Damien Neil)
2025 - Fix a case where if a client had two different leases the server could
2026 actually dereference the second one when it hadn't been referenced,
2027 leading to memory corruption and a core dump. (James Brister)
2029 - Fix a case where a client could request the address of another client's
2030 lease, but find_lease wouldn't detect that the other client had it, and
2031 would attempt to allocate it to the client, resulting in a lease conflict
2034 - Fix a case where a client with more than one client identifier could be
2035 given a lease where the hardware address was correct but the client
2036 identifier was not, resulting in a lease conflict message.
2038 - Fix a problem where the server could write out a colon-separated
2039 hex list as a value for a variable, which would then not parse.
2040 The fix is to always write strings as quoted strings, with any
2041 non-printable characters quoted as octal escape sequences. So
2042 a file written the old way still won't work, but new files written
2045 - Fix documentation for sending non-standard options.
2047 - Use unparsable names for unknown options. WARNING: this will
2048 break any configuration files that use the option-nnn convention.
2049 If you want to continue to use this convention for some options,
2050 please be sure to write a definition, like this:
2052 option option-nnn code nnn = string;
2054 You can use a descriptive name instead of option-nnn if you like.
2056 - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
2057 DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
2058 result of a deceptively silly bug in supersede_lease.
2060 - Fix client script exit status check, according to a fix supplied by
2063 - Fix an endianness bug in the tracefile support, regarding ICMP
2066 - Fix a bug in the client where the medium would not work correctly if
2067 it contained quoted strings.
2069 ** there was no pl17 **
2071 Changes since 3.0 Beta 2 Patchlevel 16
2073 - Add support for transaction tracing. This allows the state of the
2074 DHCP server on startup, and all the subsequent transactions, to be
2075 recorded in a file which can then be played back to reproduce the
2076 behaviour of the DHCP server. This can be used to quickly
2077 reproduce bugs that cause core dumps or corruption, and also for
2078 tracking down memory leaks.
2080 - Incorporate some bug fixes provided by Joost Mulders for the DLPI
2081 package which should clear up problems people have been seeing on
2084 - Fix bugs in the handling of options stored as linked lists (agent
2085 options, fqdn options and nwip options) that could cause memory
2086 corruption and core dumps.
2088 - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
2089 not being send in some cases when they were needed.
2091 - Make the lease structure somewhat more compact.
2093 - Make initial failover startup *much* faster. This was researched
2094 and implemented by Damien Neil.
2096 - Add a --version flag to all executables, which prints the program
2097 name and version to standard output.
2099 - Don't rewrite the lease file every thousand leases.
2101 - A bug in nit.c for older SunOS machines was fixed by a patch sent in
2102 by Takeshi Hagiwara.
2104 - Fix a memory corruption bug in the DHCP client.
2106 - Lots of documentation updates.
2108 - Add a feature allowing environment variables to be passed to the
2109 DHCP client script on the DHCP client command line.
2111 - Fix client medium support, which had been broken for some time.
2113 - Fix a bug in the DHCP client initial startup backoff interval, which
2114 would cause two DHCPDISCOVERS to be sent back-to-back on startup.
2117 Changes since 3.0 Beta 2 Patchlevel 15
2119 - Some documentation tweaks.
2121 - Maybe fix a problem in the DLPI code.
2123 - Fix some error code space inconsistencies in ddns update code.
2125 - Support relay agents that intercept unicast DHCP messages to stuff
2126 agent options into them.
2128 - Fix a small memory leak in the relay agent option support code.
2130 - Fix a core dump that would occur if a packet was sent with no
2133 Changes since 3.0 Beta 2 Patchlevel 14
2135 - Finish fixing a long-standing bug in the agent options code. This
2136 was causing core dumps and failing to operate correctly - in
2137 particular, agent option stashing wasn't working. Agent option
2138 stashing should now be working, meaning that agent options can be
2139 used in class statements to control address allocation.
2141 - Fix up documentation.
2143 - Fix a couple of small memory leaks that would have added up
2144 significantly in a high-demand situation.
2146 - Add a log-facility configuration parameter.
2148 - Fix a compile error on some older operating systems.
2150 - Add the ability in the client to execute certain statements before
2151 transmitting packets to the server. Handy for debugging; not much
2152 practical use otherwise.
2154 - Don't send faked-out giaddr when renewing or bound - again, useful
2157 Changes since 3.0 Beta 2 Patchlevel 13
2159 - Fixed a problem where the fqdn decoder would sometimes try to store
2160 an option with an (unsigned) negative length, resulting in a core
2161 dump on some systems.
2163 - Work around the Win98 DHCP client, which NUL-terminates the FQDN
2166 - Work around Win98 and Win2k clients that will claim they want to do
2167 the update even when they don't have any way to do it.
2169 - Fix some log messages that can be printed when failover is operating
2170 that were not printing enough information.
2172 - It was possible for a DHCPDISCOVER to get an allocation even when
2173 the state machine said the server shouldn't be responding.
2175 - Don't load balance DHCPREQUESTs from clients in RENEWING and
2176 REBINDING, since in RENEWING, if we heard it, it's for us, and in
2177 REBINDING, the client wouldn't have got to REBINDING if its primary
2180 - When we get a bogus state lease binding state transition, don't do
2184 Changes since 3.0 Beta 2 Patchlevel 12
2186 - Fixed a couple of silly compile errors.
2188 Changes since 3.0 Beta 2 Patchlevel 11
2190 - Albert Herranz tracked down and fixed a subtle bug in the base64
2191 decoder that would prevent any key with an 'x' in its base64
2192 representation from working correctly.
2194 - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
2195 hang that they both spotted in the DHCP server - when
2196 one-lease-per-client was set, the code to release the "other" lease
2199 - Fix a problem with alignment of the input buffer in bpf in cases
2200 where two packets arrive in the same bpf read.
2202 - Fix a problem where the relay agent would crash if you specified an
2203 interface name on the command line.
2205 - Add the ability to conditionalize client behaviour based on the
2208 - Add support for the FQDN option, and added support for a new way of
2209 doing ddns updates (ddns update style interim) that allows more than
2210 one DHCP server to update the DNS for the same network(s). This
2211 was implemented by Damien Neil with some additional functionality
2214 - Damien added a "log" statement, so that the configuration file can
2215 be made to log debugging information and other information.
2217 - Fixed a bug that caused option buffers not to be terminated with an
2220 - Fixed a long-standing bug in the support for option spaces where the
2221 options are stored as an ordered list rather than in a hash table,
2222 which could theoretically result in memory pool corruption.
2224 - Prevent hardware declarations with no actual hardware address from
2225 being written as something unparsable, and behave correctly in the
2226 face of a null hardware address on input.
2228 - Allow key names to be FQDNs, and qualify the algorithm name if it is
2229 specified unqualified.
2231 - Modify the DDNS update code so that it never prints the "resolver
2232 failed" message, but instead says *why* the resolver failed.
2234 - Officially support the subnet selection option, which now has an
2237 - Fix a build bug on MacOS X.
2239 - Allow administrator to disable ping checking.
2241 - Clean up dhcpd.conf documentation and add more information about how
2244 Changes since 3.0 Beta 2 Patchlevel 10
2246 - Fix a bug introduced during debugging (!) and accidentally committed
2249 Changes since 3.0 Beta 2 Patchlevel 9
2251 - Fix DHCP client handling of vendor encapsulated options.
2253 - Fix a bug in the handling of relay agent information options introduced
2256 - Stash agent options on client leases by default, and use the stashed
2257 options at renewal time.
2259 - Add the ability to test the client's binding state in the client
2260 configuration language.
2262 - Fix a core dump in the DNS update code.
2264 - Fix some expression evaluation bugs that were causing updates to be
2265 done when no client hostname was received.
2267 - Fix expression evaluation debugging printfs.
2269 - Teach pretty_print_option to print options in option spaces other than
2270 the DHCP option space.
2272 - Add a warning message if the RHS of a not is not boolean.
2274 - Never select for more than a day, because some implementations of
2275 select will just fail if the timeout is too long (!).
2277 - Fix a case where a DHCPDISCOVER from an unknown network would be
2280 - Fix a bug where if a client requested an IP address for which a different
2281 client had the lease, the DHCP server would reallocate it anyway.
2283 - Fix the DNS update code so that if the client changes its name, the DNS
2284 will be correctly updated.
2286 Changes since 3.0 Beta 2 Patchlevel 8
2288 - Oops, there was another subtle math error in the header-length
2291 Changes since 3.0 Beta 2 Patchlevel 7
2293 - Oops, forgot to byte-swap udp header length before bounds-checking it.
2295 Changes since 3.0 Beta 2 Patchlevel 6
2297 - Fix a possible DoS attack where a client could cause the checksummer
2298 to dump core. This was a read, not a write, so it shouldn't be
2299 possible to exploit it any further than that.
2301 - Implement client- and server-side support for using the Client FQDN
2304 - Support for other option spaces in the client has been added. This
2305 means that it is now possible to define a vendor option space on the
2306 client, request options in that space from the server (which must
2307 define the same option space), and then use those options in the
2308 client. This also allows NWIP and Client FQDN options to be used
2311 - Add object initializer support. This means that objects can now be
2312 initialized to something other than all-zeros when allocated, which
2313 makes, e.g., the interface object support code a little more robust.
2315 - Fix an off-by-one bug in the host stuffer. This was causing host
2316 deletes not the work, and may also have been causing OMAPI
2317 connections to get dropped. Thanks to James Brister for tracking
2320 - Fixed a core dump in the interface discovery code that is triggered
2321 when there is no subnet declaration for an interface, but the server
2322 decides to continue running. Thanks to Shane Kerr for tracking
2323 down and fixing this problem.
2325 Changes since 3.0 Beta 2 Patchlevel 5
2327 - Fix a bug in the recent enhancement to the interface discovery code
2328 to support arbitrary-length interface lists.
2330 - Support NUL-terminated DHCP options when initializing client-script
2333 - Fix suffix operator.
2335 - Fix NetWare/IP option parsing.
2337 - Better error/status checking in dhcpctl initialization and omapi
2340 - Fix a potential memory smash in dhcpctl code.
2342 - Fix SunOS4 and (maybe) Ultrix builds.
2344 - Fix a bug where a certain sort of incoming packet could cause a core
2345 dump on Solaris (and probably elsewhere).
2347 - Add some more safety checks in error logging code.
2349 - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
2351 - Fix relay agent so that if an interface is specified on the command
2352 line, the relay agent does not dump core.
2354 - Fix class matching so that match if can be combined with match or
2357 - Do not allow spurious leases in the lease database to introduce
2358 potentially bogus leases into the in-memory database.
2360 - Fix a byte-order problem in the client hardware address type code
2363 - Be slightly less picky about what sort of hardware addresses OMAPI
2364 can install in host declarations.
2366 Changes since 3.0 Beta 2 Patchlevel 4
2368 - Incorporated Peter Marschall's proposed change to array/record
2369 parsing, which allows things like the slp-agent option to be encoded
2370 correctly. Thanks very much to Peter for taking the initiative to
2371 do this, and for doing such a careful job of it (e.g., updating the
2374 - Added an encoding for the slp-agent option. :')
2376 - Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
2377 request for help on this with patches!
2379 - Incorporated a change that should fix a problem reported by Philippe
2380 Jumelle where when the network connection between two servers is
2381 lost, they never reconnect.
2383 - Fix client script files other than that for NetBSD to actually use
2384 make_resolv_conf as documented in the manual page.
2386 - Fix a bug in the packet handling code that could result in a core
2389 - Fix a bug in the bootp code where responses on the local net would
2390 be sent to the wrong MAC address. Thanks to Jerry Schave for
2393 Changes since 3.0 Beta 2 Patchlevel 3
2395 - In the DHCP client, execute client statements prior to using the values
2396 of options, so that the client configuration can overridden, e.g., the
2399 - Fix a reference counting error that would result in very reproducible
2400 failures in updates, as well as occasional core dumps, if a zone was
2401 declared without a key.
2403 - Fix some Linux 2.0 compilation problems.
2405 - Fix a bug in scope evaluation during execution of "on" statements that
2406 caused values not to be recorded on leases.
2408 - If the dhcp-max-message-size option is specified in scope, and the
2409 client didn't send this option, use the one specified in scope to
2410 determine the maximum size of the response.
2412 Changes since 3.0 Beta 2 Patchlevel 2
2414 - Fix a case where spawning subclasses were being allocated
2415 incorrectly, resulting in a core dump.
2417 - Fix a case where the DHCP server might inappropriately NAK a
2420 - Fix a place dhcprequest() where static leases could leak.
2422 - Include memory.h in omapip_p.h so that we don't get warnings about
2425 Changes since 3.0 Beta 2 Patchlevel 1
2427 - Notice when SIOCFIGCONF returns more data than fit in the buffer -
2428 allocate a larger buffer, and retry. Thanks to Greg Fausak for
2431 - In the server, if no interfaces were configured, report an error and
2434 - Don't ever record a state of 'startup'.
2436 - Don't try to evaluate the local failover binding address if none was
2437 specified. Thanks to Joseph Breu for finding this.