1 Internet Systems Consortium DHCP Distribution
9 ISC DHCP 4.1.x includes several new DHCPv6 features that were not included
10 in DHCP 4.0.x. These include:
12 - Support for the rapid-commit option on the client side
14 - Prefix Delegation support
16 - IA_TA address support
18 - A basic DHCPv6 relay agent, dhcrelay6
20 There are a number of DHCPv6 limitations and features missing in this
21 release, which will be addressed in the future:
23 - Only Solaris, Linux, FreeBSD, NetBSD, and OpenBSD are supported.
25 - Only a single address is supported per IA.
27 - DHCPv6 includes human-readable text in status code messages. These
28 should be configurable, and probably localized via gettext() or the
31 - The "host-identifier" option is limited to a simple token.
33 - The client and server can only operate DHCPv4 or DHCPv6 at a time,
34 not both. To use both protocols simultaneously, two instances of the
35 relevant daemon are required, one with the '-6' command line option.
37 For information on how to install, configure and run this software, as
38 well as how to find documentation and report bugs, please consult the
41 ISC DHCP uses standard GNU configure for installation. Please review the
42 output of "./configure --help" to see what options are available.
44 The system has only been tested on Linux, FreeBSD, and Solaris, and may not
45 work on other platforms. Please report any problems and suggested fixes to
49 Changes since 4.0.0 (new features)
51 - Added DHCPv6 rapid commit support.
53 - Added explicit parser support for zero-length DHCP options, such as
54 rapid-commit, via format code 'Z'.
56 - It's now possible to update the "ends" field of a lease with OMAPI.
57 This is useful if you want not only to release a lease, but also make
58 it available for reuse right away. Hat tip to Christof Chen.
60 - Fixed definition of the iaaddr hash functions to use the correct
61 functions when referencing and dereferencing memory.
63 - Some definitions not in phase with the IANA registry were updated.
65 - Allocated interface IDs are better controlled ('u' bit set to zero,
66 reserved IDs avoided).
68 - Unicast options are taken into account only for RENEWs.
70 - NoAddrsAvail answers to SOLICITs are always ADVERTISEs even when a SOLICIT
71 carries a rapid-commit option.
73 - Return in place of raise an impossible condition when one tries to release
74 an empty active lease.
76 - Timer granularity is now 1/100s in the DHCPv6 client.
78 - The dhclient-script was updated to create a host route for the default
79 gateway if the supplied subnet mask for an IPv4 address was a /32. This
80 allows the client to work in 'captive' network environments, where the
81 operator does not want clients to crosstalk directly.
83 - MINUS tokens should be parseable again.
85 - Multiple (up to "delayed-ack x;" maximum) DHCPv4 packets are now queued and
86 released in bursts after single fsync() events when the upper limit is
87 reached or if the receiving sockets go dry. The practical upshot is
88 that fsync-coupled server performance is now multiplicitively increased.
89 The default delayed ack limit is 28. Thanks entirely to a patch from
92 - ERO (RFC 4994) server support.
94 Changes since 4.0.0 (bug fixes)
96 - DHCP now builds on AIX.
98 - Exit with warning when DHCPv6-specific statements are used in the
99 config file but -6 is not specified.
101 - Fixed "--version" flag in dhcrelay
103 - The 'min-secs' configuration parameter's log message has been updated to
106 - The warning logged when an address range doesn't fit in the subnets
107 they were declared has been updated to be more helpful and identify the
108 typo in configuration that created the spanning addresses.
110 - A bug in failover pool rebalancing that caused POOLREQ message ping-pongs
113 - A flaw in failover pool rebalancing that could cause POOLREQ messages to
114 be sent outside of the min-balance/max-balance scheduled intervals has
117 - A cosmetic bug during potential-conflict recovery that caused the peer's
118 'conflict-done' state message to be logged as 'unknown-state' has been
119 repaired. It is now logged correctly.
121 - A bug was fixed where the 'giaddr' may be used to find the client's subnet
122 rather than its own 'ciaddr'.
124 - A log message was introduced to clarify the situation where a failover
125 'address' parameter (the server's local address) did not resolve to an
128 - The minimum site code value was set to 224 in 3.1.0 to track RFC3942. This
129 broke a lot of legacy site local configurations. The new code in place will
130 track site local space minimum option codes and logs a warning to encourage
131 updates and exploration of site local code migration problems. Option
132 codes less than 128 in site local spaces remain inaccessible.
134 - A possible relay agent option bug was repaired where random server
135 initialization state may have been used to signal the relay agent
136 information options sub-option code for the 'END' of the option space.
138 - Fixes to allow code to compile and run on Solaris 9.
140 - Fixes to allow code to compile on Mac OS X Leopard (10.5).
142 - When server is configured with options that it overrides, a warning is
143 issued when the configuration file is read, rather than at the time the
144 option is overridden. This was important, because the warning was given
145 every time the option was overridden, which could create a lot of
148 - Fixed a compilation problems on platforms that define a value for FDDI,
149 which conflicts with a dhcp configuration syntax token by the same name.
151 - When a failover server suspects it has encountered a peer running a
152 version 3.0.x failover server, a warning that the failover wire protocol
153 is incompatible is printed.
155 - The failover server no longer issues a floating point error if it encounters
156 a previously undefined option code.
158 - Fix startup error messages to report a missing "subnet6 declaration", rather
159 than a missing "subnet declaration", when running as a DHCPv6 server.
161 - DHCPv6 client timestamp in DUID was based on the year 1970 rather
164 - Warn when attempting to use a hardware parameter in DHCPv6.
166 - DHCPv6 released resources are now marked as released by the client.
168 Changes since 4.0.0b3
170 - The reverse dns name for PTR updates on IPv6 addresses has been fixed to
171 use ip6.arpa. rather than default to in-addr.arpa and require user
174 - dhc6_lease_destroy() and dhc6_ia_destroy() now set lease and IA pointers
175 to NULL after freeing, to prevent subsequent accesses to freed memory.
177 - The DHCPv6 server would not send the preference option unless the
178 client requested it, via the ORO. This has been fixed, so the DHCPv6
179 server will always send the preference value if it is configured.
181 - When addresses were passed as hints to the server in an IA, they were
182 incorrectly handled, sometimes being treated as an error. Now the
183 server will treat these as hints and ignore them if it cannot supply
186 - If the client had multiple addresses, and one expired (was not renewed
187 by the server), the client would continue to attempt to renew the same
188 old address over and over. Now, the client will omit any expired
189 addresses from future Confirm, Renew, or Rebind messages.
191 - dhclient -6 will now select renew/rebind timers based upon the longest
192 address expiration time rather than the shortest expiration time, in
193 order to avoid cascading renewals in the event a server elects not to
194 extend one of multiple IAADDR leases.
196 - The server now limits clients that request multiple addresses to one
197 address per IA by default, which can be adjusted through the
198 "limit-addrs-per-ia" configuration option.
200 - The DHCPv6 client now issues fresh transaction IDs on Renew and Rebind
201 message exchanges, rather than using the most recent ID.
203 - The DHCPv6 server now replies to Information-Request messages.
205 - A bug was fixed in the dhclient-script for BSDs to correctly carry error
206 codes through some conditions.
208 - The parsing of some options in the dhclient lease file, in particular
209 the success DHCPv6 status-code, was fixed.
211 - A bug was fixed that caused the DHCPv6 ORO option to be corrupted with
212 seemingly random values.
214 - A reference overleak in DHCPv6 shared network processing was repaired.
216 - ./configure now autodetects local database locations rather than trying
217 to put dhcpd.leases and dhclient.leases in /usr/local/var/db, which no
220 - Regression fix for bug where server advertised a IPv6 address in
221 response to a SOLICIT but would not return the address in response
224 - A bug was fixed where the DHCPv6 server puts the NoAddrsAvail status
225 code in the IA_NA was fixed. The status code now appears in the root
228 Changes since 4.0.0b2
230 - Clarified error message when lease limit exceeded
232 - Relative time may now be used as a qualifier for 'allow' and 'deny' access
233 control lists. These directives may be used to assist in re-addressing
234 address pools without having to constantly reconfigure the server. Please
235 see 'man dhcpd.conf' for more information on allow/deny 'after time' syntax.
236 Thanks to a patch from Christof Chen.
238 - The server will now include multiple IA_NA's and multiple IAADDRs within
239 them, if advertised by the client. It still only seeks to allocate one
242 Changes since 4.0.0b1
244 - Use different paths for PID and lease files when running in DHCPv4
245 or DHCPv6 mode, so that servers for both protcols can be run
246 simultaneously on a single interface.
248 - Fixed a buffer overflow error which could have allowed a denial
249 of service under unusual server configurations
251 - Eliminated a spurious error message from the client
253 - A number of bugs with the internal handling of lease state on the
254 server have been fixed. Some of these could cause server crashes.
256 - The peer_wants_leases() changes pulled up from 3.1.0 were corrected,
257 'never used' leases will no longer consistently shift between servers
258 on every pool rebalance run.
260 - sendmsg()/recvmsg() control buffers are now declared in such a way to
261 ensure they are correctly aligned on all (esp. 64-bit) architectures.
263 - The client leasing subsystem was streamlined and corrected to account
264 more closely for changes in client link attachment selection.
266 Changes since 4.0.0a3
268 - The DHCP server no longer requires a "ddns-update-style" statement,
269 and now defaults to "none", which means DNS updates are disabled.
271 - Log messages when failover peer names mismatch have been improved to
272 point out the problem.
274 - Bug where server advertised a IPv6 address in response to a SOLICIT
275 but would not return the address in response to a REQUEST. Thanks to
276 Dennis Kou for finding the bug.
278 - Fixed an error causing the server to lock up on lease expiration,
279 reported independently by Jothilingam Vasu and Dennis Kou.
281 - Fixed a ./configure bug where compile tests were failing due to
282 "-Werror" (unused variable) rather than the actual test failure. Lead
283 to inconsistent and unworkable auto-configurations.
285 - Compilation with DLPI and -Werror has been repaired.
287 - Error in decoding IA_NA option if multiple interfaces are present
288 fixed by Marcus Goller.
290 - DHCPv6 server Confirm message processing has been enhanced - it no
291 longer replies only to clients with host {} records, it now replies
292 as directed in RFC3315 section 18.2.2 - that is, to all clients
293 regardless of the existence of bindings.
295 - A core dump during expired lease cleanup has been repaired.
297 - DDNS updates state information are now stored in 'binding scopes' that
298 follow the leases through their lifecycles. This enables DDNS teardowns
299 on leases that are assigned and expired inbetween a server restart (the
300 state is recovered from dhcpd.leases). Arbitrary user-specified binding
301 scopes ('set var = "value";') are not yet supported.
303 - Additional compilation problems on HP/UX have been repaired.
305 Changes since 4.0.0a2
307 - Fix for startup where there are no IPv4 addresses on an interface.
308 Thanks to Marcus Goller for reporting the bug.
310 - Fixed file descriptor leak on listen failure. Thanks to Tom Clark.
312 - Bug in server configuration parser caused server to get stuck on
313 startup for certain bad pool declarations. Thanks to Guillaume
314 Knispel for the bug report and fix.
316 - Code cleaned to remove warnings reported by "gcc -Wall".
318 - DHCPv6 is now the default. You can disable DHCPv6 support using the
319 "--disable-dhcpv6" flag when you run the configure script.
321 - An internal database inconsistency bug was repaired where the server
322 would segfault if a client attempted to renew a lease that had been
323 loaded from persistent storage.
325 - 'request' and 'also request' syntaxes have been added to accommodate
326 the DHCPv6 client configuration. 'send dhcp6.oro' is no longer
329 - Bug fixed where configuration file parsing did not work with
330 zero-length options; this made it impossible to set the
333 - Bogus messages about host records with IPv4 fixed-addresses being of
334 non-128-bits in length were removed.
336 Changes since 4.0.0a1
338 - Bug in octal parsing fixed. Thanks to Bernd Fuhrmann for the report
341 - Autoconf now supplies proper flags for Solaris DHCPv6 builds.
343 - Fix for parsing error on some IPv6 addresses.
345 - Invalid CIDR representation for IPv6 subnets or ranges now checked
346 for when loading configuration.
348 - Compilation on HP/UX has been repaired. The changes should generally
349 apply to any architecture that supplies SIOCGLIFCONF but does not
350 use 'struct lifconf' structures to pass values.
352 - Two new operators, ~= and ~~, have been integrated to implement
353 boolean matches by regular expression (such as may be used in
354 class matching statements). Thanks to a patch by Alexandr S.
355 Agranovsky, which underwent slight modification.
357 - Fix for icmp packets on 64-bit systems (bug introduced in 4.0).
359 - A bug was fixed in interface discovery wherein an error identifying
360 a server-configured interface with no IPv4 addresses would SEGV.
362 - Fixed a bug in which write_lease() might report a failure incorrectly
364 - Added support for DHCPv6 Release messages
366 - Added -x option to dhclient, which triggers dhclient processes
367 to exit gracefully without releasing leases first
369 - All binaries (client, server, relay) now change directories
370 to / before going into daemon mode, so as not to hold $CWD open
372 - Fixed a bug parsing DHCPv6 client-id's in host-identifier statements
374 - Fixed a bug with the 'ddns-updates' boolean server configuration
375 parameter, which caused the server to fail.
377 Changes since 4.0.0-20070413
379 - Old (expired) leases are now cleaned.
381 - IPv6 subnets now have support for arbitrary allocation ranges via
382 a new 'range6' configuration directive.
384 - An obviated option code hash lookup to find D6O_CLIENTID was removed.
386 - Corrected some situations where variables might be used without being
389 - Silenced several other compiler warnings.
391 - Include the more standard sys/uio.h rather than rely upon other
392 header files to include it (fixes a BSD 4.2 compile failure).
394 - Duplicate dhclient-script updates for DHCPv6 to all provided scripts.
396 - DHCPv4 I/O methods that failed to sense hardware address were corrected.
398 - DHCPv4 is now the default (as documented) rather than DHCPv6. The default
399 was set to DHCPv6 to facilitate ease early development, and forgotten.
401 - Corrected a segmentation violation in DHCPv4 socket processing.
403 - dhclient will now fork() into the background once it binds to an
404 IPv6 address, or immediately if the -n flag is supplied.
406 - -q is now the default behaviour on dhclient, with -d or -v enabling
407 non-quiet (stderr logging) mode.
409 - Fix documentation of the domain-search atom (quoted, with commas).
411 - Document DHCPv6 options presently in the default table.
413 - Replaced ./configure shellscripting with GNU Autoconf.
415 Changes since 3.1.0 (NEW FEATURES)
417 - DHCPv6 Client and Server protocol support. Use '-6' to run the daemons
418 as v6-only. Use '-4' to run the daemons as v4-only (default. There is
419 no support currently for both.
421 - Server support for multiple IA_NA options, containing at most one
424 - Client support for one IA_NA option, containing any number of IAADDR
427 - Server support for the DHCPv6 Information-request message.
429 - Inappropriate unicast DHCPv6 messages sent to the server are now
430 discarded, and this has rearchitected the IO system slightly.
432 - The DHCPv6 server DUID defaults to type 1, is persistently stored in
433 the leases database, and can be over-ridden (either completely, or by
434 specifying type 1 or type 2).
436 - The server only uses Rapid-Commit if it has been configured with the
437 Rapid-Commit option and the client requests it.
439 - DDNS support. We now update AAAA records in the same place we would
440 update A records, if we have an IPv6 address. We also generate IP6.ARPA
441 style names for PTR records if we're dealing with an IPv6 address. Both
442 A and AAAA updates are done using the same 'fqdn.' virtual option space
443 (although the DHCPv4 FQDN and DHCPv6 FQDN options are formatted
444 differently, they both use the same code here).
446 - The Linux dhclient-script attempts to set and remove assigned addresses,
447 and to configure /etc/resolv.conf from nameserver and domain name
448 configurations. It can be extended to configure other parameters.
450 - Initial DHCPv6 lease support.
452 - The IO system now tracks all local IP addresses, so that the DHCP
453 applications (particularly the dhcrelay) can discern between what frames
454 were transmitted to it, and what frames are being carried through it which
455 it should not intercept.
457 Changes since 3.1.0 (Maintenance)
459 - A bug was repaired where MAC Address Affinity for virgin leases always
460 mapped to the primary. Virgin leases now have an interleaved preference
461 between primary and secondary.
463 - A bug was repaired where MAC Address Affinity for clients with no client
464 identifier was sometimes mishashed to the peer. Load balancing during
465 runtime and pool rebalancing were opposing.
467 - An assertion in lease counting relating to reserved leases was repaired.
469 - The subnet-mask option inclusion now conforms with RFC2132 section 3.3;
470 it will only appear prior to the routers option if it is present on the
471 Parameter-Request-List. The subnet-mask option will also only be
472 included by default (if it is not on the PRL) in response to DISCOVER
475 - The FQDN option is only supplied if the client supplied an FQDN option or
476 if the FQDN option was explicitly requested on the PRL.
478 - Dynamic BOOTP leases are now load balanced in failover.
480 Changes since 3.1.0rc1
482 - The parse warning that 'deny dyanmic bootp;' must be configured for
483 failover protected subnets was removed.
485 Changes since 3.1.0b2
487 - Failover rebalance events no longer play ping pong with round errors
488 (moving leases between free and back to backup where there are an
489 odd number of leases).
491 - The 'pool' log line has been split into two messages, one before the
492 rebalance run, and one after.
494 - Any queued BNDACKs are transmitted before transmitting new BNDUPDs.
495 This enforces the correct sequence of events for the remote server
496 processing these messages.
498 Changes since 3.1.0b1
500 - Fixed a bug that caused OMAPI clients to freeze when opening lease
503 - A new server config option "fqdn-reply" specifies whether the server
504 should send out option 81 (FQDN). Defaults to "on". If set to "off",
505 the FQDN option is not sent, even if the client requested it. This is
506 needed because some clients misbehave otherwise. Thanks to Christof Chen
509 - Allow trace output files (-tf option) to be overwritten, rather than
510 crashing dhcpd if the file already exists
512 - A bug was fixed that caused dhcpd to segfault if a pool was declared
513 outside the scope of a subnet in dhcpd.conf.
515 - Some uninitialized values were repaired in dhcpleasequery.c that
516 caused the server to abort.
518 - A new server config option, 'do-reverse-updates', has been added
519 which causes the server to abstain from performing updates on PTR
520 records. Thanks to a patch from Christof Chen at Allianz.
522 - A bug was repaired in subencapsulation support, where spaces separated
523 by empty spaces would not get included.
525 - A bug in dhclient was repaired which caused it to send parameter request
526 lists of 55 bytes in length no matter how long the declared PRL was.
528 - 'dhcp.c(3953): non-null pointer' has been repaired. This fixes a flaw
529 wherein the DHCPv4 server may ignore a configured server-identifier.
531 - A flaw in failover startup sequences was repaired that sometimes left
532 the primary DHCP server's pool rebalance schedules unscheduled.
534 - Corrected a flaw that broke encapsulated spaces included due to presence
535 on the parameter request list.
537 Changes since 3.1.0a3
539 - Some spelling fixes.
541 Changes since 3.1.0a2
543 - A bug was fixed where attempting to permit leasequeries results in a
544 fatal internal error, "Unable to find server option 49".
546 - A bug was fixed in dhclient rendering the textual output form of the
547 domain-search option syntax.
549 Changes since 3.1.0a1
551 - A bug in the FQDN universe that added FQDN codes to the NWIP universe's
552 hash table was repaired.
554 - The servers now try harder to transmit pending binding updates when
555 entering normal state.
557 - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
558 requeues all pending updates. This should reduce the number of spurious
559 'xid mismatch' log messages.
561 - An option definition referencing leak was fixed, which resulted in early
562 termination of dhclient upon the renewal event.
564 - Some default hash table sizes were tweaked, some upwards, some downwards.
565 3.1.0a1's tables resulted in a reduction in default server memory use.
566 The new selected values provide more of a zero sum (increasing the size
567 of tables likely to be populated, decreasing the size of tables unlikely).
569 - Lease structures appear in three separate hashes: by IP address, by UID,
570 and by hardware address. One type of table was used for all three, and
571 improvements to IP address hashing were applied to all three (so UID and
572 hardware addresses were treated like 4-byte integers). There are now two
573 types of tables, and the uid/hw hashes use functions more appropriate
576 - The max-lease-misbalance percentage no longer causes scheduled rebalance
577 runs to be skipped: it still governs the schedule, but every scheduled
578 run will attempt balance.
580 - A segfault bug in recursive encapsulation support has been corrected.
582 Changes since 3.0 (New Features)
584 - A workaround for certain STSN servers that send a mangled domain-name
585 option was introduced for dhclient. The client will now accept corrupted
586 server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
587 or NAK). The server will continue to not accept corrupt client packets.
589 - Support for 'reserved' (pseudo-static) and BOOTP leases via failover
592 - Support for adding, removing, and managing class and subclass statements
595 - The failover implementation was updated to comply with revision 12 of
598 - 'make install' now creates the initial zero-length dhcpd.leases file if
599 one does not already exist on the system.
601 - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
603 - The Load Balance Algorithm was misimplemented. The current implementation
606 - lcase() and ucase() configuration expressions have been added which adjust
607 their arguments from upper to lower and lower to upper cases respectively.
608 Thanks to a patch from Albert Herranz.
610 - The dhclient 'reject ...;' statement, which rejects leases given by named
611 server-identifiers, now permits address ranges to be specified in CIDR
612 notation. Thanks to a patch from David Boyce.
614 - The subnet-mask option is now supplied by default, but at lowest
615 priority. This helps a small minority of clients that provide parameter
616 request lists, but do not list the subnet-mask option because they were
617 designed to interoperate with a server that behaves in this manner.
619 - The FQDN option is similarly supplied even if it does not appear on the
620 parameter request list, but not to the exclusion of options that do
621 appear at the parameter request list. Up until now it had ultimate
622 priority over the client's parameter request list.
624 - Varying option space code and length bit widths (8/16/32) are now
625 supported. This is a milestone in achieving RFC 3925 "VIVSO" and
628 - A new common (server or client) option, 'db-time-format local;', has
629 been added which prints the local time in /var/db/dhcpd.leases rather
630 than UTC. Thanks to a patch from Ken Lalonde.
632 - Some patches to improve DHCP Server startup speed from Andrew Matheson
633 have been incorporated.
635 - Failover pairs now implement 'MAC Affinity' on leases moving from the
636 active to free states. Leases that belonged to the failover secondary
637 are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
638 If lease rebalancing must move leases, it tries first to move leases
639 that belong to the peer in need.
641 - The server no longer sends POOLREQ messages unless the pool is severely
642 misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
644 - Pool rebalance events no longer happen upon successfully allocating a
645 lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
646 min-balance and max-balance statements for more information.
648 - The DHCP Relay Agent Information Option / Link Selection Sub-Option
649 is now supported. (See RFC3527 for details).
651 - A new DDNS related server option, update-conflict-detection, has been
652 added. If this option is enabled, dhcpd will perform normal DHCID
653 conflict resolution (the default). If this option is disabled, it will
654 instead trust the assigned name implicitly (removing any other bindings
655 on that name). This option has not been made available in dhclient.
657 - In those cases where the DHCP software manufactures an IP header (to
658 transmit via bpf, lpf, etc), the IP TTL the software selects has been
659 increased from 16 to 128. This is intended to match Microsoft Windows
660 DHCP Client behaviour, to increase compatibility.
662 - 'ignore client-updates;' now has behaviour that is different from
663 'deny client-updates;'. The client's request is not truly ignored,
664 rather it is encouraged. Should this value be configured, the server
665 updates DNS as though client-updates were set to 'deny'. That is, it
666 enters into DNS whatever it is configured to do already, provided it is
667 configured to. Then it sends a response to the client that lets the
668 client believe it is performing client updates (which it will), probably
669 for a different name. In essence, this lets the client do as it will,
670 ignoring this aspect of their request.
672 - Support for compressed 'domain name list' style DHCP option contents, and
673 in particular the domain search option (#119) was added.
675 - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
676 LEASEQUERY lets you query the DHCP server for information about a lease,
677 using either an IP address, MAC address, or client identifier. Thanks
678 to a patch from Justin Haddad.
680 - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
681 ethernet mac address) on the SCO platform specifically without any strange
682 ifconfig hacks. Many thanks go to the Kroger Co. for donating the
683 hardware and funding the development.
685 - A new common configuration executable statement, execute(), has been
686 added. This permits dhcpd or dhclient to execute a named external
687 program with command line arguments specified from other configuration
688 language. Thanks to a patch written by Mattias Ronnblom, gotten to us
691 - A new dhcp server option 'adaptive-lease-time-threshold' has been added
692 which causes the server to substantially reduce lease-times if there are
693 few (configured percentage) remaining leases. Thanks to a patch submitted
696 - Encapsulated option spaces within encapsulated option spaces is now
699 Changes since 3.0.6rc1
701 - supersede_lease() now requeues leases in their respective hardware
702 address hash bucket. This mirrors client identifier behaviour.
706 - Assorted fixes for broken network devices: Packet length is now
707 determined from the IP header length field to finally calculate the
708 UDP payload length, because some NIC drivers return more data than
709 they actually received.
711 - UDP packets are now stored in aligned data structures.
713 - A logic error in omapi interface code was repaired that might result in
714 incorrectly indicating 'up' state when any flags were set, rather than
715 specifically the INTERFACE_REQUESTED flag. Thanks to a patch from
716 Jochen Voss which got to us via Andrew Pollock at Debian.
718 - A reference leak on binding scopes set by ddns updates was repaired.
720 - A memory leak in the minires_nsendsigned() function call was repaired.
721 Effectively, this leaked ~176 bytes per DDNS update.
723 - In the case where an "L2" DHCP Relay Agent (one that does not set giaddr)
724 was directly attached to the same broadcast domain as the DHCP server,
725 the RFC3046 relay agent information option was not being returned to the
726 relay in the server's replies. This was fixed; the dhcp server no longer
727 requires the giaddr to reply with relay agent information. Note that
728 this also improves compatibility with L2 devices that "intercept" DHCP
729 packets and expect relay agent information even in unicast (renewal)
730 replies. Thanks to a patch from Pekka Silvonen.
732 - A bug was fixed where the BOOTP header 'sname' field had a value, the
733 copy written to persistent storage was actually the contents of the
736 - A bug was fixed where the nwip virtual option space was referencing
737 the fqdn option's virtual option space's option cache.
739 - Timestamp parsing errors that indicated missing "minutes" fields rather
740 than the actually missing "seconds" fields have been repaired thanks to
741 a patch from Kevin Steves.
743 - A grammar error in the dhclient.8 manpage was repaired thanks to a patch
746 - Several spelling typos were repaired, and some cross-references to other
747 relevant documents were included in the manpages, thanks to a patch
748 by Andrew Pollock which got to us via Tomas Pospisek.
750 - Some bugs were fixed in the 'emergency relay agent options hologram'
751 which is used to retain relay agent option contents from when the
752 client was in INIT or REBIND states. This should solve problems where
753 relay agent options were not echoed from the server, even when giaddr
756 - dhclient now closes its descriptor to dhclient.leases prior to executing
757 dhclient-script. Thanks to a patch from Tomas Pospisek.
759 - The server's "by client-id" and "by hardware address" hash table lists
760 are now sorted according to the preference to re-allocate that lease to
761 returning clients. This should eliminate pool starvation problems
762 arising when "INIT" clients were given new leases rather than presently
765 Changes since 3.0.5rc1
767 - A bug was repaired in fixes to the dhclient, which sought to run the
768 dhclient-script with the 'EXPIRE' state should it receive a NAK in
769 response to a REQUEST. The client now iterates the PREINIT state
770 after the EXPIRE state, so that interfaces that might be configured
771 'down' can be brought back 'up' and initialized.
773 - DHCPINFORM handling for clients that properly set ciaddr and come to the
774 server via a relay aget has been repaired.
778 - A warning that host statements declared within subnet or shared-network
779 scopes are actually global has been added.
781 - The default minimum lease time (if min-lease-time was not specified)
782 was raised from 0 to 300. 0 is not thought to be sensible, and is
783 known to be damaging.
785 - Added additional fatal error sanity checks surrounding lease binding
786 state count calculations (free/active counts used for failover pool
789 - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
790 misapplied to server values rather than client values. The server no longer
791 advertises 8-byte lease-time options when on 64-bit platforms.
793 - A bug where leases not in ACTIVE state would get billed to billed classes
794 (classes with lease limitations) was fixed. Non-active leases OFFERed
795 to clients are no longer billed (but billing is checked before offering).
797 - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
798 configuration option - the default configuration and results should be
801 - If the dhclient were to receive a DHCPNAK while it was in the RENEW
802 state (and consequently, had an active, 'bound' address and related
803 configuration options), it would fail to 'tear down' this information
804 before proceeding into INIT state. dhclient now iterates the dhclient-
805 script with the 'EXPIRE' action to cause these teardowns prior to entering
806 INIT state. Thanks to a patch from Chris Zimmerman.
808 - The omapi.1 manpage had some formatting errors repaired thanks to a patch
809 from Yoshihiko Sarumaru.
811 - A few lines of code that were failover-specific were moved within
812 #if defined() clauses so that compilation without failover could be
815 - The log message emitted when the 'leased-address' value was not available
816 in dhcpd.conf "executable statements" has been updated to be more helpful.
817 Manpage information for this value has also been updated.
819 - Abandoned or dissociated (err condition) leases now remove any related
820 dynamic dns bindings. Thanks to a patch from Patrick Schoo.
822 - Attempting to write a new lease file to replace a corrupt (due to
823 encountering non-retryable errors during writing) lease file should
824 no longer result in an infinite recursion.
826 - Host declaration hardware addresses and client identifiers may only be
827 configured once. dhcpd will now fail to load config files that specify
828 multiple identifiers (previous versions would silently over-ride the
829 value with the later configured value).
831 - Several option codes that have been allocated since our last release
832 have been named and documented.
834 - Option names of the form "unknown-123" have been removed from the in-
835 memory hash tables. In order to support options of these names that
836 may appear in dhclient.leases or similar in previous versions, the
837 parser will now find the new option code definition, or mock up a
838 generic option code definition. This should result in a smooth
839 transition from one name to the other, as the new name is used to
842 Changes since 3.0.4rc1
844 - The dhcp-options.5 manpage was updated to correct indentation errors
845 thanks to a patch from Jean Delvare.
847 Changes since 3.0.4b3
849 - Some manual pages were clarified pursuant to discussion on the dhcp-server
852 Changes since 3.0.4b2
854 - Null-termination sensing for certain clients that unfortunately require
855 it in DHCPINFORM processing was repaired.
857 - The host-name option and a few others were moved from "X" format to "t"
858 format to be compatible with new NULL handling functions.
860 - DHCPINFORM processing is a little more careful about return addressing
861 its responses, or if responding via a relay. The INFORM related
862 messages also log the 'effective client ip address' rather than the
863 client's supplied ciaddr (since some clients produce null ciaddrs).
865 - The server was inappropriately sending leases to the RESET state in the
866 event that multiple active leases were found to match a singly-identified
867 client. This was changed to RELEASED (by accepting a different, ACTIVE
868 binding, the client is implicitly releasing its lease). This repairs a
869 bug wherein secondary servers in failover pairs detecting this condition
870 move leases to RESET, and primaries refuse to accept that state
871 transition (properly).
873 - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
875 Changes since 3.0.4b1
877 - Command line parsing in omshell was repaired - it no longer closes
878 STDIN after reading one line.
880 - The resolver library no longer closes the /etc/resolv.conf file
881 descriptor it opened twice.
883 - Changes to trailing NULL removal in 't' option-atoms has been rethought,
884 it now includes 'd' (domain name) types, and tries hard not to rewind an
885 option beyond the start of the text field it is un-terminating.
889 - A DDNS update handling function was misusing the DNS error codes, rather
890 than the internal generic result enumeration. The result is a confusing
891 syslog line, logging the wrong condition.
893 - The DHCP Server was not checking pool balance in the case where it brought
894 a non-ACTIVE lease out of storage for a client that was returning to use
895 a lease it once had long ago, and had since expired.
897 - Failover peers no longer bother to look for free leases to allocate when
898 they already found the client's ACTIVE lease. DISCOVERs are load balanced
899 whether freely-allocated or not, unless the server doubts the peer has
902 - Fixed a bug in dhcrelay agent addition code that suppressed trailing
903 PAD options - it was suppressing only one trailing PAD option, rather
904 than the entire block of them.
906 ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
907 option addition and stripping code. Added a few sanity checks. Although
908 highly improbable, due to requiring the reception of a DHCP datagram well
909 in excess of all known to be used physical MTU limitations, it is possible
910 this may have been used in a stack overflow security vulnerability. Thanks
911 to a patch from infamous42md.
913 ! Added some sanity checks to OMAPI connection/authentication code.
914 Although highly improbable, due to having to deliver in excess of 2^32
915 bytes of data via the OMAPI channel, not to mention requiring dhcpd to
916 be able to malloc() a memory region 2^32 bytes in size, it was possible
917 this might have resulted in a heap overflow security vulnerability.
918 Thanks to a patch from infamous42md.
920 - dmalloc() memset()'s the non-debug (data) portion of the allocated
921 memory to zero. Code that memset()'s the result returned by dmalloc() to
922 zero is redundant. These redundancies were removed.
924 - Some type declaration corrections to u_int16_t were made in common/tr.c
925 (Token Ring support) thanks to a patch from Jason Vas Dias at RedHat.
927 - A failover bug that was allowing leases that EXPIRED or were RELEASED
928 where tsfp and tstp are identical timestamps to languish in these
929 transitional states has been repaired. As a side effect, lease
930 databases should be kept more consistent overall, not just for these
933 - If the lease db is deleted out from under the daemon, and it moves to rewrite
934 the db, it will go ahead with the operation and move the new db into place
935 once it detects the old db does not exist.
937 - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
938 is either nonsensical or (in the case of IEEE1394) is not known to support
939 these interfaces. Thanks to Marius Gedminas and Andrew Pollock of Debian.
941 - Some previously undocumented reasons for dhclient-script invoking has
942 been documented in the dhclient-script.8 manpage.
944 - Failover potential expiry calculations (TSTP) have been corrected. Results
945 should be substantially more consistent, and proper given the constraints.
947 - Adjusted lease state validation checks in potential-conflict, to
948 account for possible clock skew similarly to normal state, and several
949 previously illegal transitions were made legal (ex: active->released).
951 - An impossible sanity check was removed from omapi/buffer.c, thanks to a
952 patch from 'infamous42md'.
954 - An OMAPI host/network byte order problem in lease time values has been
957 - Several minor bugs, largely relating to treating 8-byte time values as
958 4-byte entities, have been repaired after careful review of the FreeBSD
959 ports collection's patch set. Thanks to the nameless entities who have
960 contributed to the FreeBSD ports.
962 - When writing a trace file, the file is now created with permissions 0600,
963 to help administrators avoid accidentally publicising sensitive config
966 - The calculation of the maximum size of DHCP packets no longer includes
967 Ethernet framing overhead. The result is that the 'Maximum Message
968 Size' option advertised by clients, or the default value 576, is no
969 longer reduced by 14 bytes, and instead directly reflects the IP level
970 MTU (and the default, minimum allowed IP MTU of 576).
972 - The special status of RELEASED/EXPIRED/RESET leases when a server
973 is operating in partner-down was fixed. It no longer requires a
974 lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
975 event to turn these into FREE leases without peer acknowledgement
976 (after STOS+MCLT) has been repaired.
978 - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
981 - "append"ing a string onto the end of a "t" type option (such as the
982 domain-name field) that had been improperly NULL-terminated by the
983 DHCP server will no longer result in a truncated string containing
984 only the option from the server, and not the expected appended value.
985 Thanks to a patch from Jason Vas Dias at RedHat.
987 - File handlers on configuration state (config files and lease dbs) should
988 be treated consistently, regardless of whether TRACING is defined or not.
990 - The Linux build environment has had some minor improvements - better
991 sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
992 and corrections to #if operators regarding LINUX_MAJOR should it ever
995 - The server now tries harder to survive the condition where it is unable
996 to open a new lease file to rewrite the lease state database.
998 Changes since 3.0.3b3
1000 - dhclient.conf documentation for interface {} was updated to reflect recent
1001 discussion on the dhcp-hackers mailing list.
1003 - In response to reports that the software does not compile on GCC 4.0.0,
1004 -Werror was removed from Makefile.conf for all platforms that used it.
1005 We will address the true problem in a future release; this is a temporary
1008 Changes since 3.0.3b2
1010 - An error in code changes introduced in 3.0.3b2 was corrected, which caused
1011 static BOOTP clients to receive random addresses.
1013 Changes since 3.0.3b1
1015 - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
1016 host records would be left behind on leases that were not allocated to the
1017 client currently booting (eg in the case where the host was denied booting).
1019 - The dhcpd.conf.5 manpage was updated to be more clear in regards to
1020 multiple host declarations (thanks to Vincent McIntyre). 'Interim' style
1021 dynamic updates were also retouched.
1025 - A bug was fixed where a server might load balance a DHCP REQUEST to its
1026 peer after already choosing not to load balance the preceding DISCOVER.
1027 The peer cannot allocate the originating server's lease.
1029 - In the case where a secondary server lost its stable storage while the
1030 primary was still in communications-interrupted, and came back online,
1031 the lease databases would not be fully transferred to the secondary.
1032 This was due to the secondary errantly sending an extra UPDREQ message
1033 when the primary made its state transition to PARTNER-DOWN known.
1035 - The package will now compile cleanly in gcc 3.3 and 3.4. As a side effect,
1036 lease structures will be 9 bytes smaller on all platforms. Thanks to
1037 Jason Vas Dias at Redhat.
1039 - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
1040 properly restricted to only detecting broadcast interfaces. Thanks
1041 to a patch from Jason Vas Dias at RedHat.
1043 - decode_udp_ip_header was changed so that the IP address was copied out
1044 to a variable, rather than referenced by a pointer. This enforces 4-byte
1045 alignment of the 32-bit IP address value. Thanks to a patch from Dr.
1048 - An incorrect log message was corrected thanks to a patch from
1051 - A bug in DDNS was repaired, where if the server's first DDNS action was
1052 a DDNS removal rather than a DDNS update, the resolver library's
1053 retransmit timer and retry timer was set to the default, implying a
1054 15 second timeout interval. Which is a little excessive in a synchronous,
1055 single-threaded system. In all cases, ISC DHCP should now hold fast to
1056 a 1-second timeout, trying only once.
1058 - The siaddr field was being improperly set to the server-identifier when
1059 responding to DHCP messages. RFC2131 clarified the siaddr field as
1060 meaning the 'next server in the bootstrap process', eg a tftp server.
1061 The siaddr field is now left zeroed unless next-server is configured.
1063 - mockup_lease() could have returned in an error condition (or in the
1064 condition where no fixed-address was found matching the shared
1065 network) with stale references to a host record. This is probably not
1066 a memory leak since host records generally never die anyway.
1068 - A bug was repaired where failover servers would let stale client identifiers
1069 persist on leases that were reallocated to new clients not sending an id.
1071 - Binding scopes ("set var = value;") are now removed from leases allocated
1072 by failover peers if the lease had expired. This should help reduce the
1073 number of stale binding scopes on leases.
1075 - A small memory leak was closed involving client identifiers larger than
1076 7 bytes, and failover.
1078 - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
1079 cause an internal function to overflow heap. Thanks to Jason Vas Dias
1082 - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
1083 or 'NUMBER_OR_NAME' was repaired. Hexadecimal parsing is affected, and
1086 - In several cases, parse warnings were being issued before the lexical
1087 token had been advanced to the token whose value was causing an error...
1088 causing parse warnings to claim the problem is on the wrong token.
1090 - Host declarations matching on client identifier for dynamic leases will
1091 no longer match fixed-address host declarations (this is now identical
1092 to behaviour for host records matching on hardware address).
1094 Changes since 3.0.2rc3
1096 - A previously undocumented configuration directive, 'local-address',
1097 was documented in the dhcpd.conf manpage.
1099 Changes since 3.0.2rc2
1101 - Two variables introduced in 3.0.2b1 were used without being initialized
1102 in the case where neither the FILE nor SNAME fields were available for
1103 overloading. This was repaired.
1105 - A heretofore believed to be impossible corner case of the option
1106 overloading implementation turned out to be possible ("Unable to sort
1107 overloaded options after 10 tries."). The implementation was reworked
1108 to consider the case of an option so large it would require more than
1109 three chunks to fit.
1111 - Many other instances of variables being used without being initialized
1114 - An uninitialized variable in omapi_io_destroy() led to the discovery
1115 that this function may result in orphaned pointers (and hence, a memory
1118 Changes since 3.0.2rc1
1120 - allocate_lease() was rewritten to repair a bug in which the server would
1121 try to allocate an ABANDONED lease when FREE leases were available.
1123 Changes since 3.0.2b1
1125 - Some dhcp-eval.5 manpage formatting was repaired.
1129 - A bug was fixed in the server's 'option overloading' implementation,
1130 where options loaded into the 'file' and 'sname' packet fields were
1131 not aligned precisely as rfc2131 dictates.
1133 - The FreeBSD client script was changed to support the case where a domain
1134 name was not provided by the server.
1136 - A memory leak in 'omshell' per each command line parsed was
1137 repaired, thanks to a patch from Jarkko Torppa.
1139 - Log functions writing to stderr were adjusted to use the STDERR_FILENO
1140 system definition rather than '2'. This is a no-op for 90% of platforms.
1142 - One call to trace_write_packet_iov() counted the number of io vectors
1143 incorrectly, causing inconsistent tracefiles. This was fixed.
1145 - Some expression parse failure memory leaks were closed.
1147 - A host byte order problem in tracefiles was repaired.
1149 - Pools configured in DHCPD for failover possessing permission lists that
1150 previously were assumed to not include dyanmic bootp clients are now
1151 a little more pessimistic. The result is, dhcpd will nag you about just
1152 about most pools that possess a 'allow' statement with no 'deny' that
1153 would definitely match a dynamic bootp client.
1155 - The 'ddns-update-style' configuration warning bit now insists that
1156 the configuration be globally scoped.
1158 - Two memory leaks in dhclient were closed thanks to a patch from Felix
1161 - Some minor but excellently pedantic documentation errors were fixed
1162 thanks to a patch from Thomas Klausner.
1164 - Bugs in operator precedence in executable statements have been repaired
1165 once again. More legal syntaxes should be parsed legally.
1167 - Failing to initialize a tracefile for any reason if a tracefile was
1168 specified is now a fatal error. Thanks to a patch from Albert Herranz.
1170 - Corrected a bug in which the number of leases transferred as calculated
1171 by the failover primary and sent to peers in POOLRESP responses may be
1172 incorrect. This value is not believed to be used by other failover
1173 implementations, excepting perhaps as logged information.
1175 - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
1176 sending POOLREQ messages instead of POOLRESP mesasges. This message
1177 was essentially ignored since failover secondaries effectively do not
1178 respond to POOLREQ messages.
1180 - Type definitions for various bitwidths of integers in the sunos5-5
1181 build of ISC DHCP have been fixed. It should compile and run more
1182 easily when built in 64-bit for this platform.
1184 - "allow known-clients;" is now a legal syntax, to avoid confusion.
1186 - If one dhcp server chooses to 'load balance' a request to its failover
1187 peer, it first checks to see if it believes said peer has a free
1188 lease to allocate before ignoring the DISCOVER.
1190 - log() was logging a work buffer, rather than the value returned by
1191 executing the statements configured by the user. In some cases,
1192 the work buffer and the intended results were the same. In some other
1193 cases, they were not. This was fixed thanks to a patch from Gunnar
1194 Fjone and directconnect.no.
1196 - Compiler warnings for some string type conversions was fixed, thanks
1197 to Andreas Gustafsson.
1199 - The netbsd build environments were simplified to one, in which
1200 -Wconversion is not used, thanks to Andreas Gustafsson.
1202 - How randomness in the backoff-cutoff dhclient configuration variable
1203 is implemented was better documented in the manpage, and the behaviour
1204 of dhclient in REQUEST timeout handling was changed to match that of
1205 DISCOVER timeout handling.
1207 - Omapi was hardened against clients that pass in null values, thanks
1208 to a patch from Mark Jason Dominus.
1210 - A bug was fixed in dhclient that kept it from doing client-side
1211 ddns updates. Thanks to a patch from Andreas Gustafsson, which
1212 underwent some modification after review by Jason Vas Dias.
1214 - Failover implementations disconnected due to the network between
1215 them (rather than one of the two shutting down) will now try to
1216 re-establish the failover connection every 5 seconds, rather than
1217 to simply try once and give up until one of them is restarted.
1218 Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
1219 by Greger V. Teigre which led to an enhancement to it.
1221 - A problem that kept DHCP Failover secondaries from tearing down
1222 ddns records was repaired. Thanks to a patch from Ulf Ekberg from
1225 - 64bit pointer sizes are detected properly on FreeBSD now.
1227 - A bug was repaired where the DHCP server would leave stale references
1228 to host records on leases it once thought about offering to certain
1229 clients. The result would be to apply host and 'known' scopes to the
1230 wrong clients (possibly denying booting). NOTE: The 'mis-host' patch
1231 that was being circulated as a workaround is not the way this bug was
1232 fixed. If you were a victim of this bug in 3.0.1, you are cautioned
1233 to proceed carefully and see if it fixes your problem.
1235 - A bug was repaired in the server's DHCPINFORM handling, where it
1236 tried to divine the client's address from the source packet and
1237 would get it wrong. Thanks to Anshuman Singh Rawat.
1239 - A log message was introduced to help illuminate the case where the
1240 server was unable to find a lease to assign to any BOOTP client.
1241 Thanks to Daniel Baker.
1243 - A minor dhcpd.conf.5 manpage error was fixed.
1245 Changes since 3.0.1rc14
1247 - The global variable 'cur_time' was centralized and is now uniformly of a
1248 type #defined in system-dependent headers. It had previously been defined
1249 in one of many places as a 32-bit value, and this causes mayhem on 64-bit
1250 big endian systems. It probably wasn't too healthy on little endian
1253 - A printf format string error introduced in rc14 was repaired.
1255 - AIX system-dependent header file was altered to only define NO_SNPRINTF
1256 if the condition used to #ifdef in vsnprintf in AIX' header files
1259 - The Alpha/OSF system-dependent header file was altered to define
1260 NO_SNPRINTF on OS revisions older than 4.0G.
1262 - omapip/test.c had string.h added to its includes.
1264 Changes since 3.0.1rc13
1266 ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
1267 in logging messages with excessively long hostnames provided by the
1268 clients. It is highly probable that these could have been used by
1269 attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
1270 release candidates 12 or 13. Special thanks to Gregory Duchemin for
1271 both finding and solving the problem.
1273 ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
1274 in log_*() functions was evidenced, on some specific platforms where
1275 vsnprintf() was not believed to be available and calls were wrapped to
1276 sprintf() instead. Again, credit goes to Gregory Duchemin for finding
1277 the problem. Calls to snprintf() are now linked to a distribution-local
1278 snprintf implementation, only in those cases where the architecture is
1279 not known to provide one (see includes/cf/[arch].h). If you experience
1280 linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
1281 is where to look. This vulnerability did not exist in any previously
1282 published version of ISC DHCP.
1284 - Compilation on hpux 11.11 was repaired.
1286 - 'The cross-compile bug fix' was backed out.
1288 Changes since 3.0.1rc12
1290 - Fixed a bug in omapi lease lookup function, to form the hardware
1291 address for the hash lookup correctly, thanks to a patch from
1294 - Fixed a bug where dhcrelay was sending relayed responses back to the
1295 broadcast address, but with the source's unicast mac address. Should
1296 now conform to rfc2131 section 4.1.
1298 - Cross-compile bug fix; use $(AR) instead of ar. Thanks to Morten Brorup.
1300 - Fixed a crash bug in dhclient where dhcpd servers that do not provide
1301 renewal times results in an FPE. As a side effect, dhclient can now
1302 properly handle 0xFFFFFFFF (-1) expiry times supplied by servers. Thanks
1303 to a patch from Burt Silverman.
1305 - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
1306 and reformatted to correct a compilation error on Solaris platforms.
1308 - A patch was applied which fixes a case where leases read from the
1309 leases database do not properly over-ride previously read leases.
1311 - dhcpctl.3 manpage was tweaked.
1313 Changes since 3.0.1rc11
1315 - A patch from Steve Campbell was applied with minor modifications to
1316 permit reverse dns PTR record updates with values containing spaces.
1318 - A patch from Florian Lohoff was applied with some modifications to
1319 dhcrelay. It now discards packets whose hop count exceeds 10 by default,
1320 and a command-line option (-c) can be used to set this threshold.
1322 - A failover bug relating to identifying peers by name length instead of
1325 - Declaring failover configs within shared-network statements should no
1326 longer result in error.
1328 - The -nw command line option to dhclient now works.
1330 - Thanks to a patch from Michael Richardson:
1331 - Some problems with long option processing have been fixed.
1332 - Some fixes to minires so that updates of KEY records will work.
1334 - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
1335 see contrib/ms2isc/readme.txt for revision notes.
1337 - Dhclient no longer uses shell commands to kill another instance of
1338 itself, it sends the signal directly. Thanks to a patch from Martin
1341 - The FreeBSD dhclient-script was changed so that a failure to write to
1342 /etc/resolv.conf does not prematurely end the script. This keeps dhclient
1343 from looping infinitely when this is the case. Thanks to a patch from
1346 - A patch from Bill Stephens was applied which resolves a problem with lease
1347 expiry times in failover configurations.
1349 - A memory leak in configuration parsing was closed thanks to a patch from
1352 - The function which discovers interfaces will now skip non-broadcast or
1353 point-to-point interfaces, thanks to a patch from David Brownlee.
1355 - Options not yet known by the dhcpd or dhclient have had their names
1356 changed such that they do not contain # symbols, in case they should ever
1357 appear in a lease file. An option that might have been named "#144" is
1360 - Another patch from Bill Stephens which allows the ping-check timeout to
1361 be configured as 'ping-timeout'. Defaults to 1.
1363 Changes since 3.0.1rc10
1365 - Potential buffer overflows in minires repaired.
1367 - A change to the linux client script to use /bin/bash, since /bin/sh may
1370 - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
1372 - A correction of boolean parsing syntax validation - some illegal syntaxes
1373 that worked before are now detected and produce errs, some legal syntaxes
1374 that errored before will now work properly.
1376 - Some search-and-replace errors that caused some options to change their
1379 - Shu-min Chang of the Intel corporation has contributed a perl script and
1380 module that converts the MS NT4 DHCP configuration to a ISC DHCP3
1383 - Applied the remainder of the dhcpctl memory leak patch provided by Bill
1384 Squier at ReefEdge, Inc. (groo@reefedge.com).
1386 - Missing non-optional failover peer configurations will now result in a soft
1387 error rather than a null dereference.
1389 Changes since 3.0.1rc9
1391 - A format string was corrected to fix compiler warnings.
1393 - A number of spelling corrections were made in the man pages.
1395 - The dhclient.conf.5 man page was changed to refer to do-forward-updates
1396 rather than a configuration option that doesn't exist.
1398 - A FreeBSD-specific bug in the interface removal handling was fixed.
1400 - A Linux-specific Token Ring detection problem was fixed.
1402 - Hashes removed from as-yet-unknown agent options, having those options
1403 appear in reality before we know about them will no longer produce
1404 self-corrupting lease databases.
1406 - dhclient will use the proper port numbers now when using the -g option.
1408 - A order-of-operations bug with 2 match clauses in 1 class statement is
1409 fixed thanks to a patch from Andrew Matheson.
1411 - Compilation problems on Solaris were fixed.
1413 - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
1415 - A fix to the dhcp ack process which makes certain group options will be
1416 included in the first DHCPOFFER message was made thanks to a patch from
1419 - A few memory leaks were repaired thanks to patches from Bill Squier at
1420 ReefEdge, Inc. (groo@reefedge.com).
1422 - A fix for shared-networks that sometimes give clients options for the
1423 wrong subnets (in particular, 'option routers') was applied, thanks to
1424 Ted Lemon for the patch.
1426 - Omshell's handling of dotted octets as values was changed such that dots
1427 one after the other produce zero values in the integer string.
1429 Changes since 3.0.1rc8
1431 - Fix a format string vulnerability in the server that could lead to a
1432 remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
1434 - Add additional support for NetBSD/sparc64.
1436 - Fix a bug in the command-line parsing of the client. Also, resolve
1439 - Add better support for shells other than bash in the Linux client
1442 - Various build fixes for modern versions of FreeBSD and Linux.
1444 - Fix a bad bounds check when printing binding state names.
1446 - Clarify documentation about fixed-address and multiple addresses.
1448 - Fix a typo in the authoritative error message.
1450 - Make a log entry when we can't write a billing class.
1452 - Use conversion targets that are the right size on all architectures.
1454 - Increment the hop count when relaying.
1456 - Log a message when lease state is changed through OMAPI.
1458 - Don't rerun the shared_network when evaluating the pool.
1460 - Fix a reversed test in the parser.
1462 - Change the type of rbuf_max.
1464 - Make FTS_LAST a manifest constant to quiet warnings.
1466 Changes since 3.0.1rc7
1468 - Fix two compiler warnings that are generated when compiling on Solaris
1469 with gcc. These stop the build, even though they weren't actually
1470 errors, because we prefer that our builds generate no warnings.
1472 Changes since 3.0.1rc6
1474 - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
1477 - Implement lease stealing for cases where the primary has fewer leases
1478 than the secondary, as called for by the standard.
1480 - Add a fudge factor to the lease expiry acceptance code, (suggested
1481 by Kevin Miller of CMU).
1483 - Fix a bug in permit_list_match that made it much too willing to say
1484 that two permit lists matched.
1486 - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
1487 also more compact) messages about DNS updates.
1489 - Fix a bug in generating wire-format domain names for the FQDN option.
1491 - Fix a bug where the FQDN option would not be returned if the client
1492 requested it, contrary to the standard.
1494 - On Darwin, use the FreeBSD DHCP client script.
1496 - On NetBSD/sparc, don't check for casting warnings.
1498 - Add a flag in the DHCP client to disable updating the client's A
1499 record when sending an FQDN option indicating that the client is
1500 going to update its A record.
1502 - In the client, don't attempt a DNS update until one second after
1503 configuring the new IP address, and if the update times out, keep
1504 trying until a response, positive or negative, is received from the
1507 - Fix an uninitialized memory bug in the DHCP client.
1509 - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
1511 - Fix a bug in ns_parserr(), where it was returning the wrong sort
1512 of result code in some cases (suggested by Ben Harris of the
1515 - Fix a bug in is_identifier(), where it was checking against EOF
1516 instead of the END_OF_FILE token (also suggested by Ben Harris).
1518 - Fix a bug where if an option universe contained no options, the
1519 DHCP server could dump core (Walter Steiner).
1521 - Fix a bug in the handling of encapsulated options.
1523 - Fix a bug that prevented NWIP suboptions from being processed.
1525 - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
1526 as modifier flags to the FTS_ACTIVE state, as called for in the
1527 failover protocol standard.
1529 - Fix bugs in the pool merging code that resulted in references and
1530 dereferences of null pointers. This bug had no impact unless the
1531 POINTER_DEBUG flag was defined.
1533 - In the server, added a do-forward-updates flag that can be used to
1534 disable forward updates in all cases, so that sites that want the
1535 clients to take sole responsibility for updating their A record can
1538 - Make it possible to disable optimization of PTR record updates.
1540 Changes since 3.0.1rc5
1542 - Include some new documentation and changes provided by Karl Auer.
1544 - Add a workaround for some Lexmark printers that send a double-NUL-
1545 terminated host-name option, which would break DNS updates.
1547 - Fix an off-by-one error in the MAC-address checking code for
1548 DHCPRELEASE that was added in 3.0.1rc5.
1550 - Fix a bug where client-specific information was not being discarded
1551 from the lease when it expired or was released, resulting in
1552 problems if the lease was reallocated to a different client.
1554 - If more than one allocation pool is specified that has the same set
1555 of constraints as another allocation pool on the same shared
1556 network, merge the two pools.
1558 - Don't print an error in fallback_discard, since this just causes
1559 confusion and does not appear to be helping to encourage anyone to
1562 Changes since 3.0.1rc4
1564 - Fix a bug that would cause the DHCP server to spin if asked to parse
1565 a certain kind of incorrect statement.
1567 - Fix a related bug that would prevent an error from being reported in
1570 - Additional documentation.
1572 - Make sure that the hardware address matches the lease when
1573 processing a DHCPRELEASE message.
1575 Changes since 3.0.1rc3
1577 - A minor bug fix in the arguments to a logging function call.
1578 - Documentation update for dhcpd.conf.
1580 Changes since 3.0.1rc2
1582 - Allow the primary to send a POOLREQ message. This isn't what the current
1583 failover draft says to do, so we may have to back it out if I can't get the
1584 authors to relent, but the scheme for balancing that's specified in the
1585 current draft seems needlessly hairy, so I'm floating a trial balloon.
1586 The rc1 code did not implement the method described in the draft either.
1588 Changes since 3.0.1rc1
1590 - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
1591 domain or RRSET. This allows the DHCP server to forget about a name
1592 it added to the DNS once it's been removed, even if the DHCP server
1593 wasn't the one that removed it.
1595 - Install defaults for failover maximum outstanding updates and maximum
1596 silent time. This prevents problems that might occur if these values
1597 were not configured.
1599 - Don't do DDNS deletes if ddns-update-style is none.
1601 - Return relay agent information options in DHCPNAK. This prevents DHCPNAK
1602 messages from being dropped when the relay agent information option contains
1603 routing information.
1605 - Fix a problem where coming up in recover wouldn't result in an update
1608 - Add some more chatty messages when we start a recovery update and when it's
1611 - Fix a possible problem where some state might have been left around
1612 after the peer lost contact and regained contact about how many updates
1615 - Don't nix a lease update because of a lease conflict. This test has
1616 never (as far as I know) prevented a mistake, and it appears to cause
1617 problems with failover.
1619 - Add support in rc history code for keeping a selective history, rather
1620 than a history of all references and dereferences. This code is only used
1621 when extensive additional debugging is enabled.
1625 - Make allocators for hash tables. As a side effect, this fixes a memory
1626 smash in the subclass allocation code.
1628 - Fix a small bug in omshell where if you try to close an object when
1629 no object is open, it dumps core.
1631 - Fix an obscure coredump that could occur on shutdown.
1633 - Fix a bug in the recording of host declaration rubouts in the lease file.
1635 - Fix two potential spins in the host deletion code.
1637 - Fix a core dump that would happen if an application tried to update
1638 a host object attribute with a null value.
1640 Changes since 3.0 Release Candidate 12
1642 - Fix a memory leak in the evaluation code.
1644 - Fix an obscure core dump.
1646 - Print a couple of new warnings when parsing the configuration file
1647 when crucial information is left out.
1649 - Log "no free leases" as an error.
1651 - Documentation updates.
1653 Changes since 3.0 Release Candidate 11
1655 - Always return a subnet selection option if one is sent.
1657 - Fix a warning that was being printed because an automatic data
1658 structure wasn't zeroed.
1660 - Fix some failover state transitions that were being handled
1663 - When supersede_lease is called on a lease whose end time has already
1664 expired, but for which a state transition has not yet been done, do
1665 a state transition. This fixes the case where if the secondary
1666 allocated a lease to a client and the lease "expired" while the
1667 secondary was in partner-down, no expiry event would actually
1668 happen, so the lease would remain active until the primary was
1671 Changes since 3.0 Release Candidate 10
1673 - Fix a bug that was preventing released leases from changing state
1674 in failover-enabled pools.
1676 - Fix a core dump in the client identifier finder code (for host
1679 - Finish fixing a bug where bogus data would sometimes get logged to
1680 the dhclient.leases file because it was opened as descriptor 2.
1682 - Fix the Linux dhclient-script according to suggestions made by
1683 several people on the dhcp-client mailing list.
1685 - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
1687 - Print an error message and refuse to run if a failover peer is
1688 defined but not referenced by any pools.
1690 - Correct a confusing error message in failover.
1692 Changes since 3.0 Release Candidate 9
1694 - Fix a bug in lease allocation for Dynamic BOOTP clients.
1696 Changes since 3.0 Release Candidate 8 Patchlevel 2
1698 - Fix a bug that prevented update-static-leases from working.
1700 - Document failover-state OMAPI object.
1702 - Fix a compilation error on SunOS 4.
1704 Changes since 3.0 Release Candidate 8 Patchlevel 1
1706 - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
1707 This was introduced in rc8pl1 as an unintended result of the memory
1708 leakage fixes that were in pl1.
1710 - Fix a long-standing bug where the server would record that an update
1711 had been done for a client with no name, even though no update had
1712 been done, and then when the client's lease expired the deletion of
1713 that nonexistant record would time out because the name was the null
1716 - Clean up the omshell, dhcpctl and omapi man pages a bit.
1718 Changes since 3.0 Release Candidate 8
1720 - Fix a bug that could cause the DHCP server to spin if
1721 one-lease-per-client was enabled.
1723 - Fix a bug that was causing core dumps on BSD/os in the presence of
1726 - In partner-down state, don't restrict lease lengths to MCLT.
1728 - On the failover secondary, record the MCLT received from the primary
1729 so that if we come up without a connection to the primary we don't
1730 wind up giving out zero-length leases.
1732 - Fix some compilation problems on BSD/os.
1734 - Fix a bunch of memory leaks.
1736 - Fix a couple of bugs in the option printer.
1738 - Fix an obscure error reporting bug in the dns update code, and also
1739 make the message clearer when a key algorithm isn't supported.
1741 - Fix a bug in the tracing code that prevented trace runs that used
1742 tcp connections from being played back.
1744 - Add some additional debugging capability for catching memory leaks
1747 - Make the client release the lease correctly on shutdown.
1749 - Add some configurability to the build system.
1751 - Install omshell manual page in man1, not man8.
1753 - Craig Gwydir sent in a patch that fixes a long-standing bug in the
1754 DHCP client that could cause core dumps, but that for some reason
1755 hadn't been noticed until now.
1757 Changes since 3.0 Release Candidate 7
1759 - Fix a bug in failover where we weren't sending updates after a
1760 transition from communications-interrupted to normal.
1762 - Handle expired/released/reset -> free transition according to the
1763 protocol specification (this works - the other way not only wasn't
1764 conformant, but also didn't work).
1766 - Add a control object in both client and server that allows either
1767 daemon to be shut down cleanly.
1769 - When writing a lease, if we run out of disk space, shut down the
1770 output file and insist on writing a new one before proceeding.
1772 - In the server, if the OMAPI listener port is occupied, keep trying
1773 to get it, rather than simply giving up and exiting.
1775 - Support fetching variables from leases and also updating and adding
1776 variables to leases via OMAPI.
1778 - If two failover peers have wildly different clocks, refuse to start
1781 - Fix a bug in the DNS update code that could cause core dumps when
1782 running on alpha processors.
1784 - Fixed a bug in ddns updates for static lease entries, thanks to a
1785 patch from Andrey M Linkevitch.
1787 - Add support for Darwin/MacOS X
1789 - Install omshell (including new documentation).
1791 - Support DNS updates in the client (this is a very obscure feature
1792 that most DHCP client users probably will not be able to use).
1794 - Somewhat cleaner status logging in the client.
1796 - Make OMAPI key naming syntax compatible with the way keys are
1797 actually named (key names are domain names).
1799 - Fix a bug in the lease file writer.
1801 - Install DHCP ISC headers in a different place than BIND 9 ISC
1802 headers, to avoid causing trouble in BIND 9 builds.
1804 - Don't send updates for attributes on an object when the attributes
1805 haven't changed. Support deleting attributes on remote objects.
1807 - Fix a number of bugs in omshell, and add the unset and refresh
1810 - Handle disconnects in OMAPI a little bit more intelligently (so that
1811 the caller gets ECONNRESET instead of EINVAL).
1813 - Fix a bunch of bugs in the handling of clients that have existing
1814 leases when the try to renew their leases while failover is
1817 Changes since 3.0 Release Candidate 6
1819 - Fix a core dump that could happen when processing a DHCPREQUEST from
1820 a client that had a host declaration that contained both a
1821 fixed-address declaration and a dhcp-client-identifier option
1822 declaration, if the client identifier was longer than nine bytes.
1824 - Fix a memory leak that could happen in certain obscure cases when
1825 using omapi to manipulate leases.
1827 - Fix some bugs and omissions in omshell.
1830 Changes since 3.0 Release Candidate 5
1832 - Fix a bug in omapi_object_dereference that prevented objects in
1833 chains from having their reference counts decreased on dereference.
1835 - Fix a bug in omapi_object_dereference that would prevent object
1836 chains from being freed upon removal of the last reference external
1839 - Fix a number of other memory leaks in the OMAPI protocol subsystem.
1841 - Add code in the OMAPI protocol handler to trace memory leakage.
1843 - Clean up the memory allocation/reference history printer.
1845 - Support input of dotted quads and colon-separated hex lists as
1846 attribute values in omshell.
1848 - Fix a typo in the Linux interface discovery code.
1850 - Conditionalize a piece of trace code that wasn't conditional.
1852 Changes since 3.0 Release Candidate 4
1854 - Fix a bug that would prevent leases from being abandoned properly on
1857 - Fix failover peer OMAPI support.
1859 - In failover, correctly handle expiration of leases. Previously,
1860 leases would never be reclaimed because they couldn't make the
1861 transition from EXPIRED to FREE.
1863 - Fix some broken failover state transitions.
1865 - Documentation fixes.
1867 - Take out an unnecessary check in DHCP relay agent information option
1868 stashing code that was preventing REBINDING clients from rebinding.
1870 - Prevent failover peers from allocating leases in DHCPREQUEST
1871 processing if the lease belongs to the other server.
1873 - Record server version in lease file introductory comment.
1875 - Correctly report connection errors in OMAPI and failover.
1877 - Make authentication signature algorithm name comparisons in OMAPI
1880 - Fix compile problem on SunOS 4.x
1882 - If a signature algorithm is not terminated with '.', terminate it so
1883 that comparisons between fully-qualified names will work
1886 - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
1887 systems with the probe not working correctly.
1889 - Don't allow user to type omapi key on command line of omshell.
1891 Changes since 3.0 Release Candidate 3
1893 - Do lease billing on startup in a way that I *think* will finally do
1894 the billing correctly - the previous method could overbill as a
1895 result of duplicate leases.
1897 - Document OMAPI server objects.
1899 Changes since 3.0 Release Candidate 2 Patchlevel 1
1901 - Fix some problems in the DDNS update code. Thanks to Albert
1902 Herranz for figuring out the main problem.
1904 - Fix some reference counting errors on host entries that were causing
1907 - Fix a byte-swap bug in the token ring code, thanks to Jochen
1910 - Fix a bug in lease billing, thanks to Jonas Bulow.
1912 Changes since 3.0 Release Candidate 2
1914 - Change the conditions under which a DHCPRELEASE is actually
1915 committed to be consistent with lease binding states rather than
1916 using the lease end time. This may fix some problems with the
1919 - Fix a bug where lease updates would fail on Digital Unix (and maybe
1920 others) because malloc was called with a size of zero.
1922 - Fix a core dump that happens when the DHCP server can't create its
1925 Changes since 3.0 Release Candidate 1 Patchlevel 1
1927 - Fix the dhcp_failover_put_message to not attempt to allocate a
1928 zero-length buffer. Some versions of malloc() fail if you try to
1929 allocate a zero-length buffer, and this was causing problems on,
1932 - Fix a case where the failover code was printing an error message
1933 when no error had occurred.
1935 - Fix a problem where when a server went down and back up again, the
1936 peer would not see a state transition and so would stay in the
1937 non-communicating state.
1939 - Be smart about going into recover_wait.
1941 - Fix a problem in the failover implementation where peers would fail
1942 to come into sync if interrupted in the RECOVER state. This could
1943 have been the cause of some problems people have reported recently.
1945 - Fix a problem with billing classes where they would not be unbilled
1946 when the client lease expired.
1948 - If select fails, figure out which descriptor is bad, and cut it out
1949 of the I/O loop. This prevents a potentially nasty spin. I
1950 haven't heard any report it in a while, but it came up consistently
1953 - Fix a bug in the relay agent where if you specified interfaces on
1954 the command line, it would fail.
1956 - Fix a couple of small bugs in the omapi connection object (no known
1959 - Add the missing 3.0 Beta 1 lease conversion script.
1961 - Read dhcp client script hooks if they exist, rather than only if
1964 Changes since 3.0 Release Candidate 1
1966 - Fix a memory smash that happens when fixed-address leases are used.
1967 ANY SITE AT WHICH FIXED-ADDRESS STATEMENTS ARE BEING USED SHOULD
1968 UPGRADE IMMEDIATELY. This has been a long-standing bug - thanks to
1969 Alvise Nobile for discovering it and helping me to find it!
1971 - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
1974 - There is a known problem with the DHCP server doing failover on
1975 Compaq Alpha systems. This patchlevel is not a release candidate
1976 because of this bug. The bug should be straightforward to fix, so
1977 a new release candidate is expected shortly.
1979 - There is a known problem in the DDNS update code that is probably a
1980 bug, and is not, as far as we know, fixed in this patchlevel.
1982 Changes since 3.0 Beta 2 Patchlevel 24
1984 - Went over problematic failover state transitions and made them all
1985 work, so that failover should now much less fragile.
1987 - Add some dhcpctl and omapi documentation
1989 - Fix compile errors when compiling with unusual predefines.
1991 - Make Token Ring work on Linux 2.4
1993 - Fix the Digital Unix BPF_WORDALIGN bug.
1995 - Fix some dhcp client documentation errors.
1997 - Update some parts of the README file.
1999 - Support GCC on SCO.
2001 Changes since 3.0 Beta 2 Patchlevel 23
2003 - Fix a bug in the DNS update code where a status code was not being
2004 checked. This may have been causing core dumps.
2006 - When parsing the lease file, if a lease declaration includes a
2007 billing class statement, and the lease already has a billing class,
2008 unbill the old class.
2010 - When processing failover transactions, where acks will be deferred,
2011 process the state transition immediately.
2013 - Don't try to use the new SIOCGIFCONF buffer size detection code on
2014 Linux 2.0, which doesn't provide this functionality.
2016 - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
2018 - Fix a problem in using the which command in the configure script.
2020 - Fix a parse error in the client when setting up an omapi listener.
2022 - Document the -n and -g flags to the client.
2024 - Make sure there is always a stdin and stdout on startup. This
2025 prevents shell scripts from accidentally writing error messages into
2026 configuration files that happen to be opened as stderr.
2028 - If an interface is removed, the client will now notice that it is
2029 gone rather than spinning. This has only been tested on NetBSD.
2031 - The client will attempt to get an address even if it can't create a
2034 - Don't overwrite tracefiles.
2036 - Fix some memory allocation bugs in failover.
2038 Changes since 3.0 Beta 2 Patchlevel 22
2040 - Apply some patches suggested by Cyrille Lefevre, who is maintaining
2041 the FreeBSD ISC DHCP Distribution port.
2043 - Fix a core dump in DHCPRELEASE.
2045 Changes since 3.0 Beta 2 Patchlevel 21
2047 - This time for sure: fix the spin described in the changes for pl20.
2049 Changes since 3.0 Beta 2 Patchlevel 20
2051 - Fix a problem with Linux detecting large numbers of interfaces (Ben)
2053 - Fix a memory smash in the quotify code, which was introduced in
2056 - Actually fix the spin described in the changes for pl20. The
2057 previous fix only partially fixed the problem - enough to get it
2058 past the regression test.
2060 Changes since 3.0 Beta 2 Patchlevel 19
2062 - Fix a bug that could cause the server to abort if compiled with
2063 POINTER_DEBUG enabled.
2065 - Fix a bug that could cause the server to spin when responding to a
2068 - Apply Joost Mulders' suggested patches for DLPI on x86.
2070 - Support NUL characters in quoted strings.
2072 - Install unformatted man pages on SunOS.
2074 Changes since 3.0 Beta 2 Patchlevel 18
2076 - Allow the server to be placed in partner-down state using OMAPI.
2079 - Implement omshell, which can be used to do arbitrary things to the
2080 server (in theory). (Damien Neil)
2082 - Fix a case where if a client had two different leases the server could
2083 actually dereference the second one when it hadn't been referenced,
2084 leading to memory corruption and a core dump. (James Brister)
2086 - Fix a case where a client could request the address of another client's
2087 lease, but find_lease wouldn't detect that the other client had it, and
2088 would attempt to allocate it to the client, resulting in a lease conflict
2091 - Fix a case where a client with more than one client identifier could be
2092 given a lease where the hardware address was correct but the client
2093 identifier was not, resulting in a lease conflict message.
2095 - Fix a problem where the server could write out a colon-separated
2096 hex list as a value for a variable, which would then not parse.
2097 The fix is to always write strings as quoted strings, with any
2098 non-printable characters quoted as octal escape sequences. So
2099 a file written the old way still won't work, but new files written
2102 - Fix documentation for sending non-standard options.
2104 - Use unparsable names for unknown options. WARNING: this will
2105 break any configuration files that use the option-nnn convention.
2106 If you want to continue to use this convention for some options,
2107 please be sure to write a definition, like this:
2109 option option-nnn code nnn = string;
2111 You can use a descriptive name instead of option-nnn if you like.
2113 - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
2114 DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
2115 result of a deceptively silly bug in supersede_lease.
2117 - Fix client script exit status check, according to a fix supplied by
2120 - Fix an endianness bug in the tracefile support, regarding ICMP
2123 - Fix a bug in the client where the medium would not work correctly if
2124 it contained quoted strings.
2126 ** there was no pl17 **
2128 Changes since 3.0 Beta 2 Patchlevel 16
2130 - Add support for transaction tracing. This allows the state of the
2131 DHCP server on startup, and all the subsequent transactions, to be
2132 recorded in a file which can then be played back to reproduce the
2133 behaviour of the DHCP server. This can be used to quickly
2134 reproduce bugs that cause core dumps or corruption, and also for
2135 tracking down memory leaks.
2137 - Incorporate some bug fixes provided by Joost Mulders for the DLPI
2138 package which should clear up problems people have been seeing on
2141 - Fix bugs in the handling of options stored as linked lists (agent
2142 options, fqdn options and nwip options) that could cause memory
2143 corruption and core dumps.
2145 - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
2146 not being send in some cases when they were needed.
2148 - Make the lease structure somewhat more compact.
2150 - Make initial failover startup *much* faster. This was researched
2151 and implemented by Damien Neil.
2153 - Add a --version flag to all executables, which prints the program
2154 name and version to standard output.
2156 - Don't rewrite the lease file every thousand leases.
2158 - A bug in nit.c for older SunOS machines was fixed by a patch sent in
2159 by Takeshi Hagiwara.
2161 - Fix a memory corruption bug in the DHCP client.
2163 - Lots of documentation updates.
2165 - Add a feature allowing environment variables to be passed to the
2166 DHCP client script on the DHCP client command line.
2168 - Fix client medium support, which had been broken for some time.
2170 - Fix a bug in the DHCP client initial startup backoff interval, which
2171 would cause two DHCPDISCOVERS to be sent back-to-back on startup.
2174 Changes since 3.0 Beta 2 Patchlevel 15
2176 - Some documentation tweaks.
2178 - Maybe fix a problem in the DLPI code.
2180 - Fix some error code space inconsistencies in ddns update code.
2182 - Support relay agents that intercept unicast DHCP messages to stuff
2183 agent options into them.
2185 - Fix a small memory leak in the relay agent option support code.
2187 - Fix a core dump that would occur if a packet was sent with no
2190 Changes since 3.0 Beta 2 Patchlevel 14
2192 - Finish fixing a long-standing bug in the agent options code. This
2193 was causing core dumps and failing to operate correctly - in
2194 particular, agent option stashing wasn't working. Agent option
2195 stashing should now be working, meaning that agent options can be
2196 used in class statements to control address allocation.
2198 - Fix up documentation.
2200 - Fix a couple of small memory leaks that would have added up
2201 significantly in a high-demand situation.
2203 - Add a log-facility configuration parameter.
2205 - Fix a compile error on some older operating systems.
2207 - Add the ability in the client to execute certain statements before
2208 transmitting packets to the server. Handy for debugging; not much
2209 practical use otherwise.
2211 - Don't send faked-out giaddr when renewing or bound - again, useful
2214 Changes since 3.0 Beta 2 Patchlevel 13
2216 - Fixed a problem where the fqdn decoder would sometimes try to store
2217 an option with an (unsigned) negative length, resulting in a core
2218 dump on some systems.
2220 - Work around the Win98 DHCP client, which NUL-terminates the FQDN
2223 - Work around Win98 and Win2k clients that will claim they want to do
2224 the update even when they don't have any way to do it.
2226 - Fix some log messages that can be printed when failover is operating
2227 that were not printing enough information.
2229 - It was possible for a DHCPDISCOVER to get an allocation even when
2230 the state machine said the server shouldn't be responding.
2232 - Don't load balance DHCPREQUESTs from clients in RENEWING and
2233 REBINDING, since in RENEWING, if we heard it, it's for us, and in
2234 REBINDING, the client wouldn't have got to REBINDING if its primary
2237 - When we get a bogus state lease binding state transition, don't do
2241 Changes since 3.0 Beta 2 Patchlevel 12
2243 - Fixed a couple of silly compile errors.
2245 Changes since 3.0 Beta 2 Patchlevel 11
2247 - Albert Herranz tracked down and fixed a subtle bug in the base64
2248 decoder that would prevent any key with an 'x' in its base64
2249 representation from working correctly.
2251 - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
2252 hang that they both spotted in the DHCP server - when
2253 one-lease-per-client was set, the code to release the "other" lease
2256 - Fix a problem with alignment of the input buffer in bpf in cases
2257 where two packets arrive in the same bpf read.
2259 - Fix a problem where the relay agent would crash if you specified an
2260 interface name on the command line.
2262 - Add the ability to conditionalize client behaviour based on the
2265 - Add support for the FQDN option, and added support for a new way of
2266 doing ddns updates (ddns update style interim) that allows more than
2267 one DHCP server to update the DNS for the same network(s). This
2268 was implemented by Damien Neil with some additional functionality
2271 - Damien added a "log" statement, so that the configuration file can
2272 be made to log debugging information and other information.
2274 - Fixed a bug that caused option buffers not to be terminated with an
2277 - Fixed a long-standing bug in the support for option spaces where the
2278 options are stored as an ordered list rather than in a hash table,
2279 which could theoretically result in memory pool corruption.
2281 - Prevent hardware declarations with no actual hardware address from
2282 being written as something unparsable, and behave correctly in the
2283 face of a null hardware address on input.
2285 - Allow key names to be FQDNs, and qualify the algorithm name if it is
2286 specified unqualified.
2288 - Modify the DDNS update code so that it never prints the "resolver
2289 failed" message, but instead says *why* the resolver failed.
2291 - Officially support the subnet selection option, which now has an
2294 - Fix a build bug on MacOS X.
2296 - Allow administrator to disable ping checking.
2298 - Clean up dhcpd.conf documentation and add more information about how
2301 Changes since 3.0 Beta 2 Patchlevel 10
2303 - Fix a bug introduced during debugging (!) and accidentally committed
2306 Changes since 3.0 Beta 2 Patchlevel 9
2308 - Fix DHCP client handling of vendor encapsulated options.
2310 - Fix a bug in the handling of relay agent information options introduced
2313 - Stash agent options on client leases by default, and use the stashed
2314 options at renewal time.
2316 - Add the ability to test the client's binding state in the client
2317 configuration language.
2319 - Fix a core dump in the DNS update code.
2321 - Fix some expression evaluation bugs that were causing updates to be
2322 done when no client hostname was received.
2324 - Fix expression evaluation debugging printfs.
2326 - Teach pretty_print_option to print options in option spaces other than
2327 the DHCP option space.
2329 - Add a warning message if the RHS of a not is not boolean.
2331 - Never select for more than a day, because some implementations of
2332 select will just fail if the timeout is too long (!).
2334 - Fix a case where a DHCPDISCOVER from an unknown network would be
2337 - Fix a bug where if a client requested an IP address for which a different
2338 client had the lease, the DHCP server would reallocate it anyway.
2340 - Fix the DNS update code so that if the client changes its name, the DNS
2341 will be correctly updated.
2343 Changes since 3.0 Beta 2 Patchlevel 8
2345 - Oops, there was another subtle math error in the header-length
2348 Changes since 3.0 Beta 2 Patchlevel 7
2350 - Oops, forgot to byte-swap udp header length before bounds-checking it.
2352 Changes since 3.0 Beta 2 Patchlevel 6
2354 - Fix a possible DoS attack where a client could cause the checksummer
2355 to dump core. This was a read, not a write, so it shouldn't be
2356 possible to exploit it any further than that.
2358 - Implement client- and server-side support for using the Client FQDN
2361 - Support for other option spaces in the client has been added. This
2362 means that it is now possible to define a vendor option space on the
2363 client, request options in that space from the server (which must
2364 define the same option space), and then use those options in the
2365 client. This also allows NWIP and Client FQDN options to be used
2368 - Add object initializer support. This means that objects can now be
2369 initialized to something other than all-zeros when allocated, which
2370 makes, e.g., the interface object support code a little more robust.
2372 - Fix an off-by-one bug in the host stuffer. This was causing host
2373 deletes not the work, and may also have been causing OMAPI
2374 connections to get dropped. Thanks to James Brister for tracking
2377 - Fixed a core dump in the interface discovery code that is triggered
2378 when there is no subnet declaration for an interface, but the server
2379 decides to continue running. Thanks to Shane Kerr for tracking
2380 down and fixing this problem.
2382 Changes since 3.0 Beta 2 Patchlevel 5
2384 - Fix a bug in the recent enhancement to the interface discovery code
2385 to support arbitrary-length interface lists.
2387 - Support NUL-terminated DHCP options when initializing client-script
2390 - Fix suffix operator.
2392 - Fix NetWare/IP option parsing.
2394 - Better error/status checking in dhcpctl initialization and omapi
2397 - Fix a potential memory smash in dhcpctl code.
2399 - Fix SunOS4 and (maybe) Ultrix builds.
2401 - Fix a bug where a certain sort of incoming packet could cause a core
2402 dump on Solaris (and probably elsewhere).
2404 - Add some more safety checks in error logging code.
2406 - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
2408 - Fix relay agent so that if an interface is specified on the command
2409 line, the relay agent does not dump core.
2411 - Fix class matching so that match if can be combined with match or
2414 - Do not allow spurious leases in the lease database to introduce
2415 potentially bogus leases into the in-memory database.
2417 - Fix a byte-order problem in the client hardware address type code
2420 - Be slightly less picky about what sort of hardware addresses OMAPI
2421 can install in host declarations.
2423 Changes since 3.0 Beta 2 Patchlevel 4
2425 - Incorporated Peter Marschall's proposed change to array/record
2426 parsing, which allows things like the slp-agent option to be encoded
2427 correctly. Thanks very much to Peter for taking the initiative to
2428 do this, and for doing such a careful job of it (e.g., updating the
2431 - Added an encoding for the slp-agent option. :')
2433 - Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
2434 request for help on this with patches!
2436 - Incorporated a change that should fix a problem reported by Philippe
2437 Jumelle where when the network connection between two servers is
2438 lost, they never reconnect.
2440 - Fix client script files other than that for NetBSD to actually use
2441 make_resolv_conf as documented in the manual page.
2443 - Fix a bug in the packet handling code that could result in a core
2446 - Fix a bug in the bootp code where responses on the local net would
2447 be sent to the wrong MAC address. Thanks to Jerry Schave for
2450 Changes since 3.0 Beta 2 Patchlevel 3
2452 - In the DHCP client, execute client statements prior to using the values
2453 of options, so that the client configuration can overridden, e.g., the
2456 - Fix a reference counting error that would result in very reproducible
2457 failures in updates, as well as occasional core dumps, if a zone was
2458 declared without a key.
2460 - Fix some Linux 2.0 compilation problems.
2462 - Fix a bug in scope evaluation during execution of "on" statements that
2463 caused values not to be recorded on leases.
2465 - If the dhcp-max-message-size option is specified in scope, and the
2466 client didn't send this option, use the one specified in scope to
2467 determine the maximum size of the response.
2469 Changes since 3.0 Beta 2 Patchlevel 2
2471 - Fix a case where spawning subclasses were being allocated
2472 incorrectly, resulting in a core dump.
2474 - Fix a case where the DHCP server might inappropriately NAK a
2477 - Fix a place dhcprequest() where static leases could leak.
2479 - Include memory.h in omapip_p.h so that we don't get warnings about
2482 Changes since 3.0 Beta 2 Patchlevel 1
2484 - Notice when SIOCFIGCONF returns more data than fit in the buffer -
2485 allocate a larger buffer, and retry. Thanks to Greg Fausak for
2488 - In the server, if no interfaces were configured, report an error and
2491 - Don't ever record a state of 'startup'.
2493 - Don't try to evaluate the local failover binding address if none was
2494 specified. Thanks to Joseph Breu for finding this.