1 Internet Systems Consortium DHCP Distribution
9 Version 3.1.x of the ISC DHCP Distribution includes the following major
10 new features compared to its 3.0.x derivative:
12 - Failover protocol 'MAC Address Affinity' to reduce pool churn.
13 - Support for the 'reserved' and 'bootp' failover flags, which
14 means in lay terms that static allocations can be made to
15 clients in which 'on events' can be supported.
16 - Several other failover optimizations and changes.
17 - Management of class and subclass statements via OMAPI.
18 - Many new configuration statement functions.
19 - Initial formal support for VIVCO/VIVSO options.
21 For a full list of new features added in this release, please observe
22 the changes list directly following this section.
24 For information on how to install, configure and run this software,
25 as well as how to find documentation and report bugs, please consult
31 - A bug was fixed where attempting to permit leasequeries results in a
32 fatal internal error, "Unable to find server option 49".
36 - A bug in the FQDN universe that added FQDN codes to the NWIP universe's
37 hash table was repaired.
39 - The servers now try harder to transmit pending binding updates when
40 entering normal state.
42 - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
43 requeues all pending updates. This should reduce the number of spurious
44 'xid mismatch' log messages.
46 - An option definition referencing leak was fixed, which resulted in early
47 termination of dhclient upon the renewal event.
49 - Some default hash table sizes were tweaked, some upwards, some downwards.
50 3.1.0a1's tables resulted in a reduction in default server memory use.
51 The new selected values provide more of a zero sum (increasing the size
52 of tables likely to be populated, decreasing the size of tables unlikely).
54 - Lease structures appear in three spearate hashes: by IP address, by UID,
55 and by hardware address. One type of table was used for all three, and
56 improvements to IP address hashing were applied to all three (so UID and
57 hardware addresses were treated like 4-byte integers). There are now two
58 types of tables, and the uid/hw hashes use functions more appropriate
61 - The max-lease-misbalance percentage no longer causes scheduled rebalance
62 runs to be skipped: it still governs the schedule, but every scheduled
63 run will attempt balance.
65 - A segfault bug in recursive encapsulation support has been corrected.
67 Changes since 3.0 (New Features)
69 - A workaround for certain STSN servers that send a mangled domain-name
70 option was introduced for dhclient. The client will now accept corrupted
71 server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
72 or NAK). The server will continue to not accept corrupt client packets.
74 - Support for 'reserved' (psuedo-static) and BOOTP leases via failover
77 - Support for adding, removing, and managing class and subclass statements
80 - The failover implementation was updated to comply with revision 12 of
83 - 'make install' now creates the initial zero-length dhcpd.leases file if
84 one does not already exist on the system.
86 - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
88 - The Load Balance Algorithm was misimplemented. The current implementation
91 - lcase() and ucase() configuration expressions have been added which adjust
92 their arguments from upper to lower and lower to upper cases respectively.
93 Thanks to a patch from Albert Herranz.
95 - The dhclient 'reject ...;' statement, which rejects leases given by named
96 server-identifiers, now permits address ranges to be specified in CIDR
97 notation. Thanks to a patch from David Boyce.
99 - The subnet-mask option is now supplied by default, but at lowest
100 priority. This helps a small minority of clients that provide parameter
101 request lists, but do not list the subnet-mask option because they were
102 designed to interoperate with a server that behaves in this manner.
104 - The FQDN option is similarly supplied even if it does not appear on the
105 parameter request list, but not to the exclusion of options that do
106 appear at the parameter request list. Up until now it had ultimate
107 priority over the client's parameter request list.
109 - Varying option space code and length bit widths (8/16/32) are now
110 supported. This is a milestone in achieving RFC 3925 "VIVSO" and
113 - A new common (server or client) option, 'db-time-format local;', has
114 been added which prints the local time in /var/db/dhcpd.leases rather
115 than UTC. Thanks to a patch from Ken Lalonde.
117 - Some patches to improve DHCP Server startup speed from Andrew Matheson
118 have been incorporated.
120 - Failover pairs now implement 'MAC Affinity' on leases moving from the
121 active to free states. Leases that belonged to the failover secondary
122 are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
123 If lease rebalancing must move leases, it tries first to move leases
124 that belong to the peer in need.
126 - The server no longer sends POOLREQ messages unless the pool is severely
127 misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
129 - Pool rebalance events no longer happen upon successfully allocating a
130 lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
131 min-balance and max-balance statements for more information.
133 - The DHCP Relay Agent Information Option / Link Selection Sub-Option
134 is now supported. (See RFC3527 for details).
136 - A new DDNS related server option, update-conflict-detection, has been
137 added. If this option is enabled, dhcpd will perform normal DHCID
138 conflict resolution (the default). If this option is disabled, it will
139 instead trust the assigned name implicitly (removing any other bindings
140 on that name). This option has not been made available in dhclient.
142 - In those cases where the DHCP software manufactures an IP header (to
143 transmit via bpf, lpf, etc), the IP TTL the software selects has been
144 increased from 16 to 128. This is intended to match Microsoft Windows
145 DHCP Client behaviour, to increase compatibility.
147 - 'ignore client-updates;' now has behaviour that is different from
148 'deny client-updates;'. The client's request is not truly ignored,
149 rather it is encouraged. Should this value be configured, the server
150 updates DNS as though client-updates were set to 'deny'. That is, it
151 enters into DNS whatever it is configured to do already, provided it is
152 configured to. Then it sends a response to the client that lets the
153 client believe it is performing client updates (which it will), probably
154 for a different name. In essence, this lets the client do as it will,
155 ignoring this aspect of their request.
157 - Support for compressed 'domain name list' style DHCP option contents, and
158 in particular the domain search option (#119) was added.
160 - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
161 LEASEQUERY lets you query the DHCP server for information about a lease,
162 using either an IP address, MAC address, or client identifier. Thanks
163 to a patch from Justin Haddad.
165 - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
166 ethernet mac address) on the SCO platform specifically without any strange
167 ifconfig hacks. Many thanks go to the Kroger Co. for donating the
168 hardware and funding the development.
170 - A new common configuration executable statement, execute(), has been
171 added. This permits dhcpd or dhclient to execute a named external
172 program with command line arguments specified from other configuration
173 language. Thanks to a patch written by Mattias Ronnblom, gotten to us
176 - A new dhcp server option 'adaptive-lease-time-threshold' has been added
177 which causes the server to substantially reduce lease-times if there are
178 few (configured percentage) remaining leases. Thanks to a patch submitted
181 - Encapsulated option spaces within encapsulated option spaces is now
186 - A logic error in omapi interface code was repaired that might result in
187 incorrectly indicating 'up' state when any flags were set, rather than
188 specifically the INTERFACE_REQUESTED flag.
190 Changes since 3.0.5rc1
192 - A bug was repaired in fixes to the dhclient, which sought to run the
193 dhclient-script with the 'EXPIRE' state should it receive a NAK in
194 response to a REQUEST. The client now iterates the PREINIT state
195 after the EXPIRE state, so that interfaces that might be configured
196 'down' can be brought back 'up' and initialized.
198 - DHCPINFORM handling for clients that properly set ciaddr and come to the
199 server via a relay aget has been repaired.
203 - A warning that host statements declared within subnet or shared-network
204 scopes are actually global has been added.
206 - The default minimum lease time (if min-lease-time was not specified)
207 was raised from 0 to 300. 0 is not thought to be sensible, and is
208 known to be damaging.
210 - Added additional fatal error sanity checks surrounding lease binding
211 state count calculations (free/active counts used for failover pool
214 - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
215 misapplied to server values rather than client values. The server no longer
216 advertises 8-byte lease-time options when on 64-bit platforms.
218 - A bug where leases not in ACTIVE state would get billed to billed classes
219 (classes with lease limitations) was fixed. Non-active leases OFFERed
220 to clients are no longer billed (but billing is checked before offering).
222 - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
223 configuration option - the default configuration and results should be
226 - If the dhclient were to receive a DHCPNAK while it was in the RENEW
227 state (and consequently, had an active, 'bound' address and related
228 configuration options), it would fail to 'tear down' this information
229 before proceeding into INIT state. dhclient now iterates the dhclient-
230 script with the 'EXPIRE' action to cause these teardowns prior to entering
231 INIT state. Thanks to a patch from Chris Zimmerman.
233 - The omapi.1 manpage had some formatting errors repaired thanks to a patch
234 from Yoshihiko Sarumaru.
236 - A few lines of code that were failover-specific were moved within
237 #if defined() clauses so that compilation without failover could be
240 - The log message emitted when the 'leased-address' value was not available
241 in dhcpd.conf "executable statements" has been updated to be more helpful.
242 Manpage information for this value has also been updated.
244 - Abandoned or dissociated (err condition) leases now remove any related
245 dynamic dns bindings. Thanks to a patch from Patrick Schoo.
247 - Attempting to write a new lease file to replace a corrupt (due to
248 encountering non-retryable errors during writing) lease file should
249 no longer result in an infinite recursion.
251 - Host declaration hardware addresses and client identifiers may only be
252 configured once. dhcpd will now fail to load config files that specify
253 multiple identifiers (previous versions would silently over-ride the
254 value with the later configured value).
256 - Several option codes that have been allocated since our last release
257 have been named and documented.
259 - Option names of the form "unknown-123" have been removed from the in-
260 memory hash tables. In order to support options of these names that
261 may appear in dhclient.leases or similar in previous versions, the
262 parser will now find the new option code definition, or mock up a
263 generic option code definition. This should result in a smooth
264 transition from one name to the other, as the new name is used to
267 Changes since 3.0.4rc1
269 - The dhcp-options.5 manpage was updated to correct indentation errors
270 thanks to a patch from Jean Delvare.
272 Changes since 3.0.4b3
274 - Some manual pages were clarified pursuant to discussion on the dhcp-server
277 Changes since 3.0.4b2
279 - Null-termination sensing for certain clients that unfortunatley require
280 it in DHCPINFORM processing was repaired.
282 - The host-name option and a few others were moved from "X" format to "t"
283 format to be compatible with new NULL handling functions.
285 - DHCPINFORM processing is a little more careful about return addressing
286 its responses, or if responding via a relay. The INFORM related
287 messages also log the 'effective client ip address' rather than the
288 client's supplied ciaddr (since some clients produce null ciaddrs).
290 - The server was inappropriately sending leases to the RESET state in the
291 event that multiple active leases were found to match a singly-identified
292 client. This was changed to RELEASED (by accepting a different, ACTIVE
293 binding, the client is implicitly releasing its lease). This repairs a
294 bug wherein secondary servers in failover pairs detecting this condition
295 move leases to RESET, and primaries refuse to accept that state
296 transition (properly).
298 - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
300 Changes since 3.0.4b1
302 - Command line parsing in omshell was repaired - it no longer closes
303 STDIN after reading one line.
305 - The resolver library no longer closes the /etc/resolv.conf file
306 descriptor it opened twice.
308 - Changes to trailing NULL removal in 't' option-atoms has been rethought,
309 it now includes 'd' (domain name) types, and tries hard not to rewind an
310 option beyond the start of the text field it is un-terminating.
314 - A DDNS update handling function was misusing the DNS error codes, rather
315 than the internal generic result enumeration. The result is a confusing
316 syslog line, logging the wrong condition.
318 - The DHCP Server was not checking pool balance in the case where it brought
319 a non-ACTIVE lease out of storage for a client that was returning to use
320 a lease it once had long ago, and had since expired.
322 - Failover peers no longer bother to look for free leases to allocate when
323 they already found the client's ACTIVE lease. DISCOVERs are load balanced
324 wether freely-allocated or not, unless the server doubts the peer has
327 - Fixed a bug in dhcrelay agent addition code that suppressed trailing
328 PAD options - it was suppressing only one trailng PAD option, rather
329 than the entire block of them.
331 ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
332 option addition and stripping code. Added a few sanity checks. Although
333 highly improbable, due to requiring the reception of a DHCP datagram well
334 in excess of all known to be used physical MTU limitations, it is possible
335 this may have been used in a stack overflow security vulnerability. Thanks
336 to a patch from infamous42md.
338 ! Added some sanity checks to OMAPI connection/authentication code.
339 Although highly improbable, due to having to deliver in excess of 2^32
340 bytes of data via the OMAPI channel, not to mention requiring dhcpd to
341 be able to malloc() a memory region 2^32 bytes in size, it was possible
342 this might have resulted in a heap overflow security vulnerability.
343 Thanks to a patch from infamous42md.
345 - dmalloc() memset()'s the non-debug (data) portion of the allocated
346 memory to zero. Code that memset()'s the result returned by dmalloc() to
347 zero is redundant. These redundancies were removed.
349 - Some type declaration corrections to u_int16_t were made in common/tr.c
350 (Token Ring support) thanks to a patch from Jason Vas Dias at RedHat.
352 - A failover bug that was allowing leases that EXPIRED or were RELEASED
353 where tsfp and tstp are identical timestamps to languish in these
354 transitional states has been repaired. As a side effect, lease
355 databases should be kept more consistent overall, not just for these
358 - If the lease db is deleted out from under the daemon, and it moves to rewrite
359 the db, it will go ahead with the operation and move the new db into place
360 once it detects the old db does not exist.
362 - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
363 is either nonsensical or (in the case of IEEE1394) is not known to support
364 these interfaces. Thanks to Marius Gedminas and Andrew Pollock of Debian.
366 - Some previously undocumented reasons for dhclient-script invoking has
367 been doucmented in the dhclient-script.8 manpage.
369 - Failover potential expiry calculations (TSTP) have been corrected. Results
370 should be substantially more consistent, and proper given the constraints.
372 - Adjusted lease state validation checks in potential-conflict, to
373 account for possible clock skew similarly to normal state, and several
374 previously illegal transitions were made legal (ex: active->released).
376 - An impossible sanity check was removed from omapi/buffer.c, thanks to a
377 patch from 'infamous42md'.
379 - An OMAPI host/network byte order problem in lease time values has been
382 - Several minor bugs, largely relating to treating 8-byte time values as
383 4-byte entities, have been repaired after careful review of the FreeBSD
384 ports collection's patch set. Thanks to the nameless entities who have
385 contributed to the FreeBSD ports.
387 - When writing a trace file, the file is now created with permissions 0600,
388 to help administrators avoid accidentally publicising sensitive config
391 - The calculation of the maximum size of DHCP packets no longer includes
392 Ethernet framing overhead. The result is that the 'Maximum Message
393 Size' option advertised by clients, or the default value 576, is no
394 longer reduced by 14 bytes, and instead directly reflects the IP level
395 MTU (and the default, minimum allowed IP MTU of 576).
397 - The special status of RELEASED/EXPIRED/RESET leases when a server
398 is operating in partner-down was fixed. It no longer requires a
399 lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
400 event to turn these into FREE leases without peer acknowledgement
401 (after STOS+MCLT) has been repaired.
403 - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
406 - "append"ing a string onto the end of a "t" type option (such as the
407 domain-name field) that had been improperly NULL-terminated by the
408 DHCP server will no longer result in a truncated string containing
409 only the option from the server, and not the expected appended value.
410 Thanks to a patch from Jason Vas Dias at RedHat.
412 - File handlers on configuration state (config files and lease dbs) should
413 be treated consistently, regardless of wether TRACING is defined or not.
415 - The linux build environment has had some minor improvements - better
416 sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
417 and corrections to #if operators regarding LINUX_MAJOR should it ever
420 - The server now tries harder to survive the condition where it is unable
421 to open a new lease file to rewrite the lease state database.
423 Changes since 3.0.3b3
425 - dhclient.conf documentation for interface {} was updated to reflect recent
426 discussion on the dhcp-hackers mailing list.
428 - In response to reports that the software does not compile on GCC 4.0.0,
429 -Werror was removed from Makefile.conf for all platforms that used it.
430 We will address the true problem in a future release; this is a temporary
433 Changes since 3.0.3b2
435 - An error in code changes introduced in 3.0.3b2 was corrected, which caused
436 static BOOTP clients to receive random addresses.
438 Changes since 3.0.3b1
440 - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
441 host records would be left behind on leases that were not allocated to the
442 client currently booting (eg in the case where the host was denied booting).
444 - The dhcpd.conf.5 manpage was updated to be more clear in regards to
445 multiple host declarations (thanks to Vincent McIntyre). 'Interim' style
446 dynamic updates were also retouched.
450 - A bug was fixed where a server might load balance a DHCP REQUEST to its
451 peer after already choosing not to load balance the preceeding DISCOVER.
452 The peer cannot allocate the originating server's lease.
454 - In the case where a secondary server lost its stable storage while the
455 primary was still in communications-interrupted, and came back online,
456 the lease databases would not be fully transferred to the secondary.
457 This was due to the secondary errantly sending an extra UPDREQ message
458 when the primary made its state transition to PARTNER-DOWN known.
460 - The package will now compile cleanly in gcc 3.3 and 3.4. As a side effect,
461 lease structures will be 9 bytes smaller on all platforms. Thanks to
462 Jason Vas Dias at Redhat.
464 - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
465 properly restricted to only detecting broadcast interfaces. Thanks
466 to a patch from Jason Vas Dias at RedHat.
468 - decode_udp_ip_header was changed so that the IP address was copied out
469 to a variable, rather than referenced by a pointer. This enforces 4-byte
470 alignment of the 32-bit IP address value. Thanks to a patch from Dr.
473 - An incorrect log message was corrected thanks to a patch from
476 - A bug in DDNS was repaired, where if the server's first DDNS action was
477 a DDNS removal rather than a DDNS update, the resolver library's
478 retransmit timer and retry timer was set to the default, implying a
479 15 second timeout interval. Which is a little excessive in a synchronous,
480 single-threaded system. In all cases, ISC DHCP should now hold fast to
481 a 1-second timeout, trying only once.
483 - The siaddr field was being improperly set to the server-identifier when
484 responding to DHCP messages. RFC2131 clarified the siaddr field as
485 meaning the 'next server in the bootstrap process', eg a tftp server.
486 The siaddr field is now left zeroed unless next-server is configured.
488 - mockup_lease() could have returned in an error condition (or in the
489 condition where no fixed-address was found matching the shared
490 network) with stale references to a host record. This is probably not
491 a memory leak since host records generally never die anyway.
493 - A bug was repaired where failover servers would let stale client identifiers
494 persist on leases that were reallocated to new clients not sending an id.
496 - Binding scopes ("set var = value;") are now removed from leases allocated
497 by failover peers if the lease had expired. This should help reduce the
498 number of stale binding scopes on leases.
500 - A small memory leak was closed involving client identifiers larger than
501 7 bytes, and failover.
503 - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
504 cause an internal function to overflow heap. Thanks to Jason Vas Dias
507 - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
508 or 'NUMBER_OR_NAME' was repaired. Hexadecimal parsing is affected, and
511 - In several cases, parse warnings were being issued before the lexical
512 token had been advanced to the token whose value was causing an error...
513 causing parse warnings to claim the problem is on the wrong token.
515 - Host declarations matching on client identifier for dynamic leases will
516 no longer match fixed-address host declarations (this is now identical
517 to behaviour for host records matching on hardware address).
519 Changes since 3.0.2rc3
521 - A previously undocumented configuration directive, 'local-address',
522 was documented in the dhcpd.conf manpage.
524 Changes since 3.0.2rc2
526 - Two varaibles introduced in 3.0.2b1 were used without being initialized
527 in the case where neither the FILE nor SNAME fields were available for
528 overloading. This was repaired.
530 - A heretofore believed to be impossible corner case of the option
531 overloading implementation turned out to be possible ("Unable to sort
532 overloaded options after 10 tries."). The implementation was reworked
533 to consider the case of an option so large it would require more than
536 - Many other instances of variables being used without being initialized
539 - An uninitialized variable in omapi_io_destroy() led to the discovery
540 that this function may result in orphaned pointers (and hence, a memory
543 Changes since 3.0.2rc1
545 - allocate_lease() was rewritten to repair a bug in which the server would
546 try to allocate an ABANDONED lease when FREE leases were available.
548 Changes since 3.0.2b1
550 - Some dhcp-eval.5 manpage formatting was repaired.
554 - A bug was fixed in the server's 'option overloading' implementation,
555 where options loaded into the 'file' and 'sname' packet fields were
556 not aligned precisely as rfc2131 dictates.
558 - The FreeBSD client script was changed to support the case where a domain
559 name was not provided by the server.
561 - A memory leak in 'omshell' per each command line parsed was
562 repaired, thanks to a patch from Jarkko Torppa.
564 - Log functions writing to stderr were adjusted to use the STDERR_FILENO
565 system definition rather than '2'. This is a no-op for 90% of platforms.
567 - One call to trace_write_packet_iov() counted the number of io vectors
568 incorrectly, causing inconsistent tracefiles. This was fixed.
570 - Some expression parse failure memory leaks were closed.
572 - A host byte order problem in tracefiles was repaired.
574 - Pools configured in DHCPD for failover possessing permission lists that
575 previously were assumed to not include dyanmic bootp clients are now
576 a little more pessimistic. The result is, dhcpd will nag you about just
577 about most pools that possess a 'allow' statement with no 'deny' that
578 would definitely match a dynamic bootp client.
580 - The 'ddns-update-style' configuration warning bit now insists that
581 the configuration be globally scoped.
583 - Two memory leaks in dhclient were closed thanks to a patch from Felix
586 - Some minor but excellently pedantic documentation errors were fixed
587 thanks to a patch from Thomas Klausner.
589 - Bugs in operator precedence in executable statements have been repaired
590 once again. More legal syntaxes should be parsed legally.
592 - Failing to initialize a tracefile for any reason if a tracefile was
593 specified is now a fatal error. Thanks to a patch from Albert Herranz.
595 - Corrected a bug in which the number of leases transferred as calculated
596 by the failover primary and sent to peers in POOLRESP responses may be
597 incorrect. This value is not believed to be used by other failover
598 implementations, excepting perhaps as logged information.
600 - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
601 sending POOLREQ messages instead of POOLRESP mesasges. This message
602 was essentially ignored since failover secondaries effectively do not
603 respond to POOLREQ messages.
605 - Type definitions for various bitwidths of integers in the sunos5-5
606 build of ISC DHCP have been fixed. It should compile and run more
607 easily when built in 64-bit for this platform.
609 - "allow known-clients;" is now a legal syntax, to avoid confusion.
611 - If one dhcp server chooses to 'load balance' a request to its failover
612 peer, it first checks to see if it believes said peer has a free
613 lease to allocate before ignoring the DISCOVER.
615 - log() was logging a work buffer, rather than the value returned by
616 executing the statements configured by the user. In some cases,
617 the work buffer and the intended results were the same. In some other
618 cases, they were not. This was fixed thanks to a patch from Gunnar
619 Fjone and directconnect.no.
621 - Compiler warnings for some string type conversions was fixed, thanks
622 to Andreas Gustafsson.
624 - The netbsd build environments were simplified to one, in which
625 -Wconversion is not used, thanks to Andreas Gustafsson.
627 - How randomness in the backoff-cutoff dhclient configuration variable
628 is implemented was better documented in the manpage, and the behaviour
629 of dhclient in REQUEST timeout handling was changed to match that of
630 DISCOVER timeout handling.
632 - Omapi was hardened against clients that pass in null values, thanks
633 to a patch from Mark Jason Dominus.
635 - A bug was fixed in dhclient that kept it from doing client-side
636 ddns updates. Thanks to a patch from Andreas Gustafsson, which
637 underwent some modification after review by Jason Vas Dias.
639 - Failover implementations disconnected due to the network between
640 them (rather than one of the two shutting down) will now try to
641 re-establish the failover connection every 5 seconds, rather than
642 to simply try once and give up until one of them is restarted.
643 Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
644 by Greger V. Teigre which led to an enhancement to it.
646 - A problem that kept DHCP Failover secondaries from tearing down
647 ddns records was repaired. Thanks to a patch from Ulf Ekberg from
650 - 64bit pointer sizes are detected properly on FreeBSD now.
652 - A bug was repaired where the DHCP server would leave stale references
653 to host records on leases it once thought about offering to certain
654 clients. The result would be to apply host and 'known' scopes to the
655 wrong clients (possibly denying booting). NOTE: The 'mis-host' patch
656 that was being circulated as a workaround is not the way this bug was
657 fixed. If you were a victim of this bug in 3.0.1, you are cautioned
658 to proceed carefully and see if it fixes your problem.
660 - A bug was repaired in the server's DHCPINFORM handling, where it
661 tried to divine the client's address from the source packet and
662 would get it wrong. Thanks to Anshuman Singh Rawat.
664 - A log message was introduced to help illuminate the case where the
665 server was unable to find a lease to assign to any BOOTP client.
666 Thanks to Daniel Baker.
668 - A minor dhcpd.conf.5 manpage error was fixed.
670 Changes since 3.0.1rc14
672 - The global variable 'cur_time' was centralized and is now uniformly of a
673 type #defined in system-dependent headers. It had previously been defined
674 in one of many places as a 32-bit value, and this causes mayhem on 64-bit
675 big endian systems. It probably wasn't too healthy on little endian
678 - A printf format string error introduced in rc14 was repaired.
680 - AIX system-dependent header file was altered to only define NO_SNPRINTF
681 if the condition used to #ifdef in vsnprintf in AIX' header files
684 - The Alpha/OSF system-dependent header file was altered to define
685 NO_SNPRINTF on OS revisions older than 4.0G.
687 - omapip/test.c had string.h added to its includes.
689 Changes since 3.0.1rc13
691 ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
692 in logging messages with excessively long hostnames provided by the
693 clients. It is highly probable that these could have been used by
694 attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
695 release candidates 12 or 13. Special thanks to Gregory Duchemin for
696 both finding and solving the problem.
698 ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
699 in log_*() functions was evidented, on some specific platforms where
700 vsnprintf() was not believed to be available and calls were wrapped to
701 sprintf() instead. Again, credit goes to Gregory Duchemin for finding
702 the problem. Calls to snprintf() are now linked to a distribution-local
703 snprintf implementation, only in those cases where the architecture is
704 not known to provide one (see includes/cf/[arch].h). If you experience
705 linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
706 is where to look. This vulnerability did not exist in any previously
707 published version of ISC DHCP.
709 - Compilation on hpux 11.11 was repaired.
711 - 'The cross-compile bug fix' was backed out.
713 Changes since 3.0.1rc12
715 - Fixed a bug in omapi lease lookup function, to form the hardware
716 address for the hash lookup correctly, thanks to a patch from
719 - Fixed a bug where dhcrelay was sending relayed responses back to the
720 broadcast address, but with the source's unicast mac address. Should
721 now conform to rfc2131 section 4.1.
723 - Cross-compile bug fix; use $(AR) instead of ar. Thanks to Morten Brorup.
725 - Fixed a crash bug in dhclient where dhcpd servers that do not provide
726 renewal times results in an FPE. As a side effect, dhclient can now
727 properly handle 0xFFFFFFFF (-1) expiry times supplied by servers. Thanks
728 to a patch from Burt Silverman.
730 - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
731 and reformatted to correct a compilation error on solaris platforms.
733 - A patch was applied which fixes a case where leases read from the
734 leases database do not properly over-ride previously read leases.
736 - dhcpctl.3 manpage was tweaked.
738 Changes since 3.0.1rc11
740 - A patch from Steve Campbell was applied with minor modifications to
741 permit reverse dns PTR record updates with values containing spaces.
743 - A patch from Florian Lohoff was applied with some modifications to
744 dhcrelay. It now discards packets whose hop count exceeds 10 by default,
745 and a command-line option (-c) can be used to set this threshold.
747 - A failover bug relating to identifying peers by name length instead of
750 - Delcaring failover configs within shared-network statements should no
751 longer result in error.
753 - The -nw command line option to dhclient now works.
755 - Thanks to a patch from Michael Richardson:
756 - Some problems with long option processing have been fixed.
757 - Some fixes to minires so that updates of KEY records will work.
759 - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
760 see contrib/ms2isc/readme.txt for revision notes.
762 - Dhclient no longer uses shell commands to kill another instance of
763 itself, it sends the signal directly. Thanks to a patch from Martin
766 - The FreeBSD dhclient-script was changed so that a failure to write to
767 /etc/resolv.conf does not prematurely end the script. This keeps dhclient
768 from looping infinitely when this is the case. Thanks to a patch from
771 - A patch from Bill Stephens was applied which resolves a problem with lease
772 expiry times in failover configurations.
774 - A memory leak in configuration parsing was closed thanks to a patch from
777 - The function which discovers interfaces will now skip non-broadcast or
778 point-to-point interfaces, thanks to a patch from David Brownlee.
780 - Options not yet known by the dhcpd or dhclient have had their names
781 changed such that they do not contain # symbols, in case they should ever
782 appear in a lease file. An option that might have been named "#144" is
785 - Another patch from Bill Stephens which allows the ping-check timeout to
786 be configured as 'ping-timeout'. Defaults to 1.
788 Changes since 3.0.1rc10
790 - Potential buffer overflows in minires repaired.
792 - A change to the linux client script to use /bin/bash, since /bin/sh may
795 - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
797 - A correction of boolean parsing syntax validation - some illegal syntaxes
798 that worked before are now detected and produce errs, some legal syntaxes
799 that errored before will now work properly.
801 - Some search-and-replace errors that caused some options to change their
804 - Shu-min Chang of the Intel corporation has contributed a perl script and
805 module that converts the MS NT4 DHCP configuration to a ISC DHCP3
808 - Applied the remainder of the dhcpctl memory leak patch provided by Bill
809 Squier at ReefEdge, Inc. (groo@reefedge.com).
811 - Missing non-optional failover peer configurations will now result in a soft
812 error rather than a null dereference.
814 Changes since 3.0.1rc9
816 - A format string was corrected to fix compiler warnings.
818 - A number of spelling corrections were made in the man pages.
820 - The dhclient.conf.5 man page was changed to refer to do-forward-updates
821 rather than a configuration option that doesn't exist.
823 - A FreeBSD-specific bug in the interface removal handling was fixed.
825 - A Linux-specific Token Ring detection problem was fixed.
827 - Hashes removed from as-yet-unknown agent options, having those options
828 appear in reality before we know about them will no longer produce
829 self-corrupting lease databases.
831 - dhclient will use the proper port numbers now when using the -g option.
833 - A order-of-operations bug with 2 match clauses in 1 class statement is
834 fixed thanks to a patch from Andrew Matheson.
836 - Compilation problems on Solaris were fixed.
838 - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
840 - A fix to the dhcp ack process which makes certain group options will be
841 included in the first DHCPOFFER message was made thanks to a patch from
844 - A few memory leaks were repaired thanks to patches from Bill Squier at
845 ReefEdge, Inc. (groo@reefedge.com).
847 - A fix for shared-networks that sometimes give clients options for the
848 wrong subnets (in particular, 'option routers') was applied, thanks to
849 Ted Lemon for the patch.
851 - Omshell's handling of dotted octets as values was changed such that dots
852 one after the other produce zero values in the integer string.
854 Changes since 3.0.1rc8
856 - Fix a format string vulnerability in the server that could lead to a
857 remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
859 - Add additional support for NetBSD/sparc64.
861 - Fix a bug in the command-line parsing of the client. Also, resolve
864 - Add better support for shells other than bash in the Linux client
867 - Various build fixes for modern versions of FreeBSD and Linux.
869 - Fix a bad bounds check when printing binding state names.
871 - Clarify documentation about fixed-address and multiple addresses.
873 - Fix a typo in the authoritative error message.
875 - Make a log entry when we can't write a billing class.
877 - Use conversion targets that are the right size on all architectures.
879 - Increment the hop count when relaying.
881 - Log a message when lease state is changed through OMAPI.
883 - Don't rerun the shared_network when evaluating the pool.
885 - Fix a reversed test in the parser.
887 - Change the type of rbuf_max.
889 - Make FTS_LAST a manifest constant to quiet warnings.
891 Changes since 3.0.1rc7
893 - Fix two compiler warnings that are generated when compiling on Solaris
894 with gcc. These stop the build, even though they weren't actually
895 errors, because we prefer that our builds generate no warnings.
897 Changes since 3.0.1rc6
899 - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
902 - Implement lease stealing for cases where the primary has fewer leases
903 than the secondary, as called for by the standard.
905 - Add a fudge factor to the lease expiry acceptance code, (suggested
906 by Kevin Miller of CMU).
908 - Fix a bug in permit_list_match that made it much too willing to say
909 that two permit lists matched.
911 - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
912 also more compact) messages about DNS updates.
914 - Fix a bug in generating wire-format domain names for the FQDN option.
916 - Fix a bug where the FQDN option would not be returned if the client
917 requested it, contrary to the standard.
919 - On Darwin, use the FreeBSD DHCP client script.
921 - On NetBSD/sparc, don't check for casting warnings.
923 - Add a flag in the DHCP client to disable updating the client's A
924 record when sending an FQDN option indicating that the client is
925 going to update its A record.
927 - In the client, don't attempt a DNS update until one second after
928 configuring the new IP address, and if the update times out, keep
929 trying until a response, positive or negative, is received from the
932 - Fix an uninitialized memory bug in the DHCP client.
934 - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
936 - Fix a bug in ns_parserr(), where it was returning the wrong sort
937 of result code in some cases (suggested by Ben Harris of the
940 - Fix a bug in is_identifier(), where it was checking against EOF
941 instead of the END_OF_FILE token (also suggested by Ben Harris).
943 - Fix a bug where if an option universe contained no options, the
944 DHCP server could dump core (Walter Steiner).
946 - Fix a bug in the handling of encapsulated options.
948 - Fix a bug that prevented NWIP suboptions from being processed.
950 - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
951 as modifier flags to the FTS_ACTIVE state, as called for in the
952 failover protocol standard.
954 - Fix bugs in the pool merging code that resulted in references and
955 dereferences of null pointers. This bug had no impact unless the
956 POINTER_DEBUG flag was defined.
958 - In the server, added a do-forward-updates flag that can be used to
959 disable forward updates in all cases, so that sites that want the
960 clients to take sole responsibility for updating their A record can
963 - Make it possible to disable optimization of PTR record updates.
965 Changes since 3.0.1rc5
967 - Include some new documentation and changes provided by Karl Auer.
969 - Add a workaround for some Lexmark printers that send a double-NUL-
970 terminated host-name option, which would break DNS updates.
972 - Fix an off-by-one error in the MAC-address checking code for
973 DHCPRELEASE that was added in 3.0.1rc5.
975 - Fix a bug where client-specific information was not being discarded
976 from the lease when it expired or was released, resulting in
977 problems if the lease was reallocated to a different client.
979 - If more than one allocation pool is specified that has the same set
980 of constraints as another allocation pool on the same shared
981 network, merge the two pools.
983 - Don't print an error in fallback_discard, since this just causes
984 confusion and does not appear to be helping to encourage anyone to
987 Changes since 3.0.1rc4
989 - Fix a bug that would cause the DHCP server to spin if asked to parse
990 a certain kind of incorrect statement.
992 - Fix a related bug that would prevent an error from being reported in
995 - Additional documentation.
997 - Make sure that the hardware address matches the lease when
998 processing a DHCPRELEASE message.
1000 Changes since 3.0.1rc3
1002 - A minor bug fix in the arguments to a logging function call.
1003 - Documentation update for dhcpd.conf.
1005 Changes since 3.0.1rc2
1007 - Allow the primary to send a POOLREQ message. This isn't what the current
1008 failover draft says to do, so we may have to back it out if I can't get the
1009 authors to relent, but the scheme for balancing that's specified in the
1010 current draft seems needlessly hairy, so I'm floating a trial balloon.
1011 The rc1 code did not implement the method described in the draft either.
1013 Changes since 3.0.1rc1
1015 - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
1016 domain or RRSET. This allows the DHCP server to forget about a name
1017 it added to the DNS once it's been removed, even if the DHCP server
1018 wasn't the one that removed it.
1020 - Install defaults for failover maximum outstanding updates and maximum
1021 silent time. This prevents problems that might occur if these values
1022 were not configured.
1024 - Don't do DDNS deletes if ddns-update-style is none.
1026 - Return relay agent information options in DHCPNAK. This prevents DHCPNAK
1027 messages from being dropped when the relay agent information option contains
1028 routing information.
1030 - Fix a problem where coming up in recover wouldn't result in an update
1033 - Add some more chatty messages when we start a recovery update and when it's
1036 - Fix a possible problem where some state might have been left around
1037 after the peer lost contact and regained contact about how many updates
1040 - Don't nix a lease update because of a lease conflict. This test has
1041 never (as far as I know) prevented a mistake, and it appears to cause
1042 problems with failover.
1044 - Add support in rc history code for keeping a selective history, rather
1045 than a history of all references and dereferences. This code is only used
1046 when extensive additional debugging is enabled.
1050 - Make allocators for hash tables. As a side effect, this fixes a memory
1051 smash in the subclass allocation code.
1053 - Fix a small bug in omshell where if you try to close an object when
1054 no object is open, it dumps core.
1056 - Fix an obscure coredump that could occur on shutdown.
1058 - Fix a bug in the recording of host declaration rubouts in the lease file.
1060 - Fix two potential spins in the host deletion code.
1062 - Fix a core dump that would happen if an application tried to update
1063 a host object attribute with a null value.
1065 Changes since 3.0 Release Candidate 12
1067 - Fix a memory leak in the evaluation code.
1069 - Fix an obscure core dump.
1071 - Print a couple of new warnings when parsing the configuration file
1072 when crucial information is left out.
1074 - Log "no free leases" as an error.
1076 - Documentation updates.
1078 Changes since 3.0 Release Candidate 11
1080 - Always return a subnet selection option if one is sent.
1082 - Fix a warning that was being printed because an automatic data
1083 structure wasn't zeroed.
1085 - Fix some failover state transitions that were being handled
1088 - When supersede_lease is called on a lease whose end time has already
1089 expired, but for which a state transition has not yet been done, do
1090 a state transition. This fixes the case where if the secondary
1091 allocated a lease to a client and the lease "expired" while the
1092 secondary was in partner-down, no expiry event would actually
1093 happen, so the lease would remain active until the primary was
1096 Changes since 3.0 Release Candidate 10
1098 - Fix a bug that was preventing released leases from changing state
1099 in failover-enabled pools.
1101 - Fix a core dump in the client identifier finder code (for host
1104 - Finish fixing a bug where bogus data would sometimes get logged to
1105 the dhclient.leases file because it was opened as descriptor 2.
1107 - Fix the Linux dhclient-script according to suggestions made by
1108 several people on the dhcp-client mailing list.
1110 - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
1112 - Print an error message and refuse to run if a failover peer is
1113 defined but not referenced by any pools.
1115 - Correct a confusing error message in failover.
1117 Changes since 3.0 Release Candidate 9
1119 - Fix a bug in lease allocation for Dynamic BOOTP clients.
1121 Changes since 3.0 Release Candidate 8 Patchlevel 2
1123 - Fix a bug that prevented update-static-leases from working.
1125 - Document failover-state OMAPI object.
1127 - Fix a compilation error on SunOS 4.
1129 Changes since 3.0 Release Candidate 8 Patchlevel 1
1131 - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
1132 This was introduced in rc8pl1 as an unintended result of the memory
1133 leakage fixes that were in pl1.
1135 - Fix a long-standing bug where the server would record that an update
1136 had been done for a client with no name, even though no update had
1137 been done, and then when the client's lease expired the deletion of
1138 that nonexistant record would time out because the name was the null
1141 - Clean up the omshell, dhcpctl and omapi man pages a bit.
1143 Changes since 3.0 Release Candidate 8
1145 - Fix a bug that could cause the DHCP server to spin if
1146 one-lease-per-client was enabled.
1148 - Fix a bug that was causing core dumps on BSD/os in the presence of
1151 - In partner-down state, don't restrict lease lengths to MCLT.
1153 - On the failover secondary, record the MCLT received from the primary
1154 so that if we come up without a connection to the primary we don't
1155 wind up giving out zero-length leases.
1157 - Fix some compilation problems on BSD/os.
1159 - Fix a bunch of memory leaks.
1161 - Fix a couple of bugs in the option printer.
1163 - Fix an obscure error reporting bug in the dns update code, and also
1164 make the message clearer when a key algorithm isn't supported.
1166 - Fix a bug in the tracing code that prevented trace runs that used
1167 tcp connections from being played back.
1169 - Add some additional debugging capability for catching memory leaks
1172 - Make the client release the lease correctly on shutdown.
1174 - Add some configurability to the build system.
1176 - Install omshell manual page in man1, not man8.
1178 - Craig Gwydir sent in a patch that fixes a long-standing bug in the
1179 DHCP client that could cause core dumps, but that for some reason
1180 hadn't been noticed until now.
1182 Changes since 3.0 Release Candidate 7
1184 - Fix a bug in failover where we weren't sending updates after a
1185 transition from communications-interrupted to normal.
1187 - Handle expired/released/reset -> free transition according to the
1188 protocol specification (this works - the other way not only wasn't
1189 conformant, but also didn't work).
1191 - Add a control object in both client and server that allows either
1192 daemon to be shut down cleanly.
1194 - When writing a lease, if we run out of disk space, shut down the
1195 output file and insist on writing a new one before proceeding.
1197 - In the server, if the OMAPI listener port is occupied, keep trying
1198 to get it, rather than simply giving up and exiting.
1200 - Support fetching variables from leases and also updating and adding
1201 variables to leases via OMAPI.
1203 - If two failover peers have wildly different clocks, refuse to start
1206 - Fix a bug in the DNS update code that could cause core dumps when
1207 running on alpha processors.
1209 - Fixed a bug in ddns updates for static lease entries, thanks to a
1210 patch from Andrey M Linkevitch.
1212 - Add support for Darwin/MacOS X
1214 - Install omshell (including new documentation).
1216 - Support DNS updates in the client (this is a very obscure feature
1217 that most DHCP client users probably will not be able to use).
1219 - Somewhat cleaner status logging in the client.
1221 - Make OMAPI key naming syntax compatible with the way keys are
1222 actually named (key names are domain names).
1224 - Fix a bug in the lease file writer.
1226 - Install DHCP ISC headers in a different place than BIND 9 ISC
1227 headers, to avoid causing trouble in BIND 9 builds.
1229 - Don't send updates for attributes on an object when the attributes
1230 haven't changed. Support deleting attributes on remote objects.
1232 - Fix a number of bugs in omshell, and add the unset and refresh
1235 - Handle disconnects in OMAPI a little bit more intelligently (so that
1236 the caller gets ECONNRESET instead of EINVAL).
1238 - Fix a bunch of bugs in the handling of clients that have existing
1239 leases when the try to renew their leases while failover is
1242 Changes since 3.0 Release Candidate 6
1244 - Fix a core dump that could happen when processing a DHCPREQUEST from
1245 a client that had a host declaration that contained both a
1246 fixed-address declaration and a dhcp-client-identifier option
1247 declaration, if the client identifier was longer than nine bytes.
1249 - Fix a memory leak that could happen in certain obscure cases when
1250 using omapi to manipulate leases.
1252 - Fix some bugs and omissions in omshell.
1255 Changes since 3.0 Release Candidate 5
1257 - Fix a bug in omapi_object_dereference that prevented objects in
1258 chains from having their reference counts decreased on dereference.
1260 - Fix a bug in omapi_object_dereference that would prevent object
1261 chains from being freed upon removal of the last reference external
1264 - Fix a number of other memory leaks in the OMAPI protocol subsystem.
1266 - Add code in the OMAPI protocol handler to trace memory leakage.
1268 - Clean up the memory allocation/reference history printer.
1270 - Support input of dotted quads and colon-separated hex lists as
1271 attribute values in omshell.
1273 - Fix a typo in the Linux interface discovery code.
1275 - Conditionalize a piece of trace code that wasn't conditional.
1277 Changes since 3.0 Release Candidate 4
1279 - Fix a bug that would prevent leases from being abandoned properly on
1282 - Fix failover peer OMAPI support.
1284 - In failover, correctly handle expiration of leases. Previously,
1285 leases would never be reclaimed because they couldn't make the
1286 transition from EXPIRED to FREE.
1288 - Fix some broken failover state transitions.
1290 - Documentation fixes.
1292 - Take out an unnecessary check in DHCP relay agent information option
1293 stashing code that was preventing REBINDING clients from rebinding.
1295 - Prevent failover peers from allocating leases in DHCPREQUEST
1296 processing if the lease belongs to the other server.
1298 - Record server version in lease file introductory comment.
1300 - Correctly report connection errors in OMAPI and failover.
1302 - Make authentication signature algorithm name comparisons in OMAPI
1305 - Fix compile problem on SunOS 4.x
1307 - If a signature algorithm is not terminated with '.', terminate it so
1308 that comparisons between fully-qualified names will work
1311 - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
1312 systems with the probe not working correctly.
1314 - Don't allow user to type omapi key on command line of omshell.
1316 Changes since 3.0 Release Candidate 3
1318 - Do lease billing on startup in a way that I *think* will finally do
1319 the billing correctly - the previous method could overbill as a
1320 result of duplicate leases.
1322 - Document OMAPI server objects.
1324 Changes since 3.0 Release Candidate 2 Patchlevel 1
1326 - Fix some problems in the DDNS update code. Thanks to Albert
1327 Herranz for figuring out the main problem.
1329 - Fix some reference counting errors on host entries that were causing
1332 - Fix a byte-swap bug in the token ring code, thanks to Jochen
1335 - Fix a bug in lease billing, thanks to Jonas Bulow.
1337 Changes since 3.0 Release Candidate 2
1339 - Change the conditions under which a DHCPRELEASE is actually
1340 committed to be consistent with lease binding states rather than
1341 using the lease end time. This may fix some problems with the
1344 - Fix a bug where lease updates would fail on Digital Unix (and maybe
1345 others) because malloc was called with a size of zero.
1347 - Fix a core dump that happens when the DHCP server can't create its
1350 Changes since 3.0 Release Candidate 1 Patchlevel 1
1352 - Fix the dhcp_failover_put_message to not attempt to allocate a
1353 zero-length buffer. Some versions of malloc() fail if you try to
1354 allocate a zero-length buffer, and this was causing problems on,
1357 - Fix a case where the failover code was printing an error message
1358 when no error had occurred.
1360 - Fix a problem where when a server went down and back up again, the
1361 peer would not see a state transition and so would stay in the
1362 non-communicating state.
1364 - Be smart about going into recover_wait.
1366 - Fix a problem in the failover implementation where peers would fail
1367 to come into sync if interrupted in the RECOVER state. This could
1368 have been the cause of some problems people have reported recently.
1370 - Fix a problem with billing classes where they would not be unbilled
1371 when the client lease expired.
1373 - If select fails, figure out which descriptor is bad, and cut it out
1374 of the I/O loop. This prevents a potentially nasty spin. I
1375 haven't heard any report it in a while, but it came up consistently
1378 - Fix a bug in the relay agent where if you specified interfaces on
1379 the command line, it would fail.
1381 - Fix a couple of small bugs in the omapi connection object (no known
1384 - Add the missing 3.0 Beta 1 lease conversion script.
1386 - Read dhcp client script hooks if they exist, rather than only if
1389 Changes since 3.0 Release Candidate 1
1391 - Fix a memory smash that happens when fixed-address leases are used.
1392 ANY SITE AT WHICH FIXED-ADDRESS STATEMENTS ARE BEING USED SHOULD
1393 UPGRADE IMMEDIATELY. This has been a long-standing bug - thanks to
1394 Alvise Nobile for discovering it and helping me to find it!
1396 - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
1399 - There is a known problem with the DHCP server doing failover on
1400 Compaq Alpha systems. This patchlevel is not a release candidate
1401 because of this bug. The bug should be straightforward to fix, so
1402 a new release candidate is expected shortly.
1404 - There is a known problem in the DDNS update code that is probably a
1405 bug, and is not, as far as we know, fixed in this patchlevel.
1407 Changes since 3.0 Beta 2 Patchlevel 24
1409 - Went over problematic failover state transitions and made them all
1410 work, so that failover should now much less fragile.
1412 - Add some dhcpctl and omapi documentation
1414 - Fix compile errors when compiling with unusual predefines.
1416 - Make Token Ring work on Linux 2.4
1418 - Fix the Digital Unix BPF_WORDALIGN bug.
1420 - Fix some dhcp client documentation errors.
1422 - Update some parts of the README file.
1424 - Support GCC on SCO.
1426 Changes since 3.0 Beta 2 Patchlevel 23
1428 - Fix a bug in the DNS update code where a status code was not being
1429 checked. This may have been causing core dumps.
1431 - When parsing the lease file, if a lease declaration includes a
1432 billing class statement, and the lease already has a billing class,
1433 unbill the old class.
1435 - When processing failover transactions, where acks will be deferred,
1436 process the state transition immediately.
1438 - Don't try to use the new SIOCGIFCONF buffer size detection code on
1439 Linux 2.0, which doesn't provide this functionality.
1441 - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
1443 - Fix a problem in using the which command in the configure script.
1445 - Fix a parse error in the client when setting up an omapi listener.
1447 - Document the -n and -g flags to the client.
1449 - Make sure there is always a stdin and stdout on startup. This
1450 prevents shell scripts from accidentally writing error messages into
1451 configuration files that happen to be opened as stderr.
1453 - If an interface is removed, the client will now notice that it is
1454 gone rather than spinning. This has only been tested on NetBSD.
1456 - The client will attempt to get an address even if it can't create a
1459 - Don't overwrite tracefiles.
1461 - Fix some memory allocation bugs in failover.
1463 Changes since 3.0 Beta 2 Patchlevel 22
1465 - Apply some patches suggested by Cyrille Lefevre, who is maintaining
1466 the FreeBSD ISC DHCP Distribution port.
1468 - Fix a core dump in DHCPRELEASE.
1470 Changes since 3.0 Beta 2 Patchlevel 21
1472 - This time for sure: fix the spin described in the changes for pl20.
1474 Changes since 3.0 Beta 2 Patchlevel 20
1476 - Fix a problem with Linux detecting large numbers of interfaces (Ben)
1478 - Fix a memory smash in the quotify code, which was introduced in
1481 - Actually fix the spin described in the changes for pl20. The
1482 previous fix only partially fixed the problem - enough to get it
1483 past the regression test.
1485 Changes since 3.0 Beta 2 Patchlevel 19
1487 - Fix a bug that could cause the server to abort if compiled with
1488 POINTER_DEBUG enabled.
1490 - Fix a bug that could cause the server to spin when responding to a
1493 - Apply Joost Mulders' suggested patches for DLPI on x86.
1495 - Support NUL characters in quoted strings.
1497 - Install unformatted man pages on SunOS.
1499 Changes since 3.0 Beta 2 Patchlevel 18
1501 - Allow the server to be placed in partner-down state using OMAPI.
1504 - Implement omshell, which can be used to do arbitrary things to the
1505 server (in theory). (Damien Neil)
1507 - Fix a case where if a client had two different leases the server could
1508 actually dereference the second one when it hadn't been referenced,
1509 leading to memory corruption and a core dump. (James Brister)
1511 - Fix a case where a client could request the address of another client's
1512 lease, but find_lease wouldn't detect that the other client had it, and
1513 would attempt to allocate it to the client, resulting in a lease conflict
1516 - Fix a case where a client with more than one client identifier could be
1517 given a lease where the hardware address was correct but the client
1518 identifier was not, resulting in a lease conflict message.
1520 - Fix a problem where the server could write out a colon-separated
1521 hex list as a value for a variable, which would then not parse.
1522 The fix is to always write strings as quoted strings, with any
1523 non-printable characters quoted as octal escape sequences. So
1524 a file written the old way still won't work, but new files written
1527 - Fix documentation for sending non-standard options.
1529 - Use unparsable names for unknown options. WARNING: this will
1530 break any configuration files that use the option-nnn convention.
1531 If you want to continue to use this convention for some options,
1532 please be sure to write a definition, like this:
1534 option option-nnn code nnn = string;
1536 You can use a descriptive name instead of option-nnn if you like.
1538 - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
1539 DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
1540 result of a deceptively silly bug in supersede_lease.
1542 - Fix client script exit status check, according to a fix supplied by
1545 - Fix an endianness bug in the tracefile support, regarding ICMP
1548 - Fix a bug in the client where the medium would not work correctly if
1549 it contained quoted strings.
1551 ** there was no pl17 **
1553 Changes since 3.0 Beta 2 Patchlevel 16
1555 - Add support for transaction tracing. This allows the state of the
1556 DHCP server on startup, and all the subsequent transactions, to be
1557 recorded in a file which can then be played back to reproduce the
1558 behaviour of the DHCP server. This can be used to quickly
1559 reproduce bugs that cause core dumps or corruption, and also for
1560 tracking down memory leaks.
1562 - Incorporate some bug fixes provided by Joost Mulders for the DLPI
1563 package which should clear up problems people have been seeing on
1566 - Fix bugs in the handling of options stored as linked lists (agent
1567 options, fqdn options and nwip options) that could cause memory
1568 corruption and core dumps.
1570 - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
1571 not being send in some cases when they were needed.
1573 - Make the lease structure somewhat more compact.
1575 - Make initial failover startup *much* faster. This was researched
1576 and implemented by Damien Neil.
1578 - Add a --version flag to all executables, which prints the program
1579 name and version to standard output.
1581 - Don't rewrite the lease file every thousand leases.
1583 - A bug in nit.c for older SunOS machines was fixed by a patch sent in
1584 by Takeshi Hagiwara.
1586 - Fix a memory corruption bug in the DHCP client.
1588 - Lots of documentation updates.
1590 - Add a feature allowing environment variables to be passed to the
1591 DHCP client script on the DHCP client command line.
1593 - Fix client medium support, which had been broken for some time.
1595 - Fix a bug in the DHCP client initial startup backoff interval, which
1596 would cause two DHCPDISCOVERS to be sent back-to-back on startup.
1599 Changes since 3.0 Beta 2 Patchlevel 15
1601 - Some documentation tweaks.
1603 - Maybe fix a problem in the DLPI code.
1605 - Fix some error code space inconsistencies in ddns update code.
1607 - Support relay agents that intercept unicast DHCP messages to stuff
1608 agent options into them.
1610 - Fix a small memory leak in the relay agent option support code.
1612 - Fix a core dump that would occur if a packet was sent with no
1615 Changes since 3.0 Beta 2 Patchlevel 14
1617 - Finish fixing a long-standing bug in the agent options code. This
1618 was causing core dumps and failing to operate correctly - in
1619 particular, agent option stashing wasn't working. Agent option
1620 stashing should now be working, meaning that agent options can be
1621 used in class statements to control address allocation.
1623 - Fix up documentation.
1625 - Fix a couple of small memory leaks that would have added up
1626 significantly in a high-demand situation.
1628 - Add a log-facility configuration parameter.
1630 - Fix a compile error on some older operating systems.
1632 - Add the ability in the client to execute certain statements before
1633 transmitting packets to the server. Handy for debugging; not much
1634 practical use otherwise.
1636 - Don't send faked-out giaddr when renewing or bound - again, useful
1639 Changes since 3.0 Beta 2 Patchlevel 13
1641 - Fixed a problem where the fqdn decoder would sometimes try to store
1642 an option with an (unsigned) negative length, resulting in a core
1643 dump on some systems.
1645 - Work around the Win98 DHCP client, which NUL-terminates the FQDN
1648 - Work around Win98 and Win2k clients that will claim they want to do
1649 the update even when they don't have any way to do it.
1651 - Fix some log messages that can be printed when failover is operating
1652 that were not printing enough information.
1654 - It was possible for a DHCPDISCOVER to get an allocation even when
1655 the state machine said the server shouldn't be responding.
1657 - Don't load balance DHCPREQUESTs from clients in RENEWING and
1658 REBINDING, since in RENEWING, if we heard it, it's for us, and in
1659 REBINDING, the client wouldn't have got to REBINDING if its primary
1662 - When we get a bogus state lease binding state transition, don't do
1666 Changes since 3.0 Beta 2 Patchlevel 12
1668 - Fixed a couple of silly compile errors.
1670 Changes since 3.0 Beta 2 Patchlevel 11
1672 - Albert Herranz tracked down and fixed a subtle bug in the base64
1673 decoder that would prevent any key with an 'x' in its base64
1674 representation from working correctly.
1676 - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
1677 hang that they both spotted in the DHCP server - when
1678 one-lease-per-client was set, the code to release the "other" lease
1681 - Fix a problem with alignment of the input buffer in bpf in cases
1682 where two packets arrive in the same bpf read.
1684 - Fix a problem where the relay agent would crash if you specified an
1685 interface name on the command line.
1687 - Add the ability to conditionalize client behaviour based on the
1690 - Add support for the FQDN option, and added support for a new way of
1691 doing ddns updates (ddns update style interim) that allows more than
1692 one DHCP server to update the DNS for the same network(s). This
1693 was implemented by Damien Neil with some additional functionality
1696 - Damien added a "log" statement, so that the configuration file can
1697 be made to log debugging information and other information.
1699 - Fixed a bug that caused option buffers not to be terminated with an
1702 - Fixed a long-standing bug in the support for option spaces where the
1703 options are stored as an ordered list rather than in a hash table,
1704 which could theoretically result in memory pool corruption.
1706 - Prevent hardware declarations with no actual hardware address from
1707 being written as something unparsable, and behave correctly in the
1708 face of a null hardware address on input.
1710 - Allow key names to be FQDNs, and qualify the algorithm name if it is
1711 specified unqualified.
1713 - Modify the DDNS update code so that it never prints the "resolver
1714 failed" message, but instead says *why* the resolver failed.
1716 - Officially support the subnet selection option, which now has an
1719 - Fix a build bug on MacOS X.
1721 - Allow administrator to disable ping checking.
1723 - Clean up dhcpd.conf documentation and add more information about how
1726 Changes since 3.0 Beta 2 Patchlevel 10
1728 - Fix a bug introduced during debugging (!) and accidentally committed
1731 Changes since 3.0 Beta 2 Patchlevel 9
1733 - Fix DHCP client handling of vendor encapsulated options.
1735 - Fix a bug in the handling of relay agent information options introduced
1738 - Stash agent options on client leases by default, and use the stashed
1739 options at renewal time.
1741 - Add the ability to test the client's binding state in the client
1742 configuration language.
1744 - Fix a core dump in the DNS update code.
1746 - Fix some expression evaluation bugs that were causing updates to be
1747 done when no client hostname was received.
1749 - Fix expression evaluation debugging printfs.
1751 - Teach pretty_print_option to print options in option spaces other than
1752 the DHCP option space.
1754 - Add a warning message if the RHS of a not is not boolean.
1756 - Never select for more than a day, because some implementations of
1757 select will just fail if the timeout is too long (!).
1759 - Fix a case where a DHCPDISCOVER from an unknown network would be
1762 - Fix a bug where if a client requested an IP address for which a different
1763 client had the lease, the DHCP server would reallocate it anyway.
1765 - Fix the DNS update code so that if the client changes its name, the DNS
1766 will be correctly updated.
1768 Changes since 3.0 Beta 2 Patchlevel 8
1770 - Oops, there was another subtle math error in the header-length
1773 Changes since 3.0 Beta 2 Patchlevel 7
1775 - Oops, forgot to byte-swap udp header length before bounds-checking it.
1777 Changes since 3.0 Beta 2 Patchlevel 6
1779 - Fix a possible DoS attack where a client could cause the checksummer
1780 to dump core. This was a read, not a write, so it shouldn't be
1781 possible to exploit it any further than that.
1783 - Implement client- and server-side support for using the Client FQDN
1786 - Support for other option spaces in the client has been added. This
1787 means that it is now possible to define a vendor option space on the
1788 client, request options in that space from the server (which must
1789 define the same option space), and then use those options in the
1790 client. This also allows NWIP and Client FQDN options to be used
1793 - Add object initializer support. This means that objects can now be
1794 initialized to something other than all-zeros when allocated, which
1795 makes, e.g., the interface object support code a little more robust.
1797 - Fix an off-by-one bug in the host stuffer. This was causing host
1798 deletes not the work, and may also have been causing OMAPI
1799 connections to get dropped. Thanks to James Brister for tracking
1802 - Fixed a core dump in the interface discovery code that is triggered
1803 when there is no subnet declaration for an interface, but the server
1804 decides to continue running. Thanks to Shane Kerr for tracking
1805 down and fixing this problem.
1807 Changes since 3.0 Beta 2 Patchlevel 5
1809 - Fix a bug in the recent enhancement to the interface discovery code
1810 to support arbitrary-length interface lists.
1812 - Support NUL-terminated DHCP options when initializing client-script
1815 - Fix suffix operator.
1817 - Fix NetWare/IP option parsing.
1819 - Better error/status checking in dhcpctl initialization and omapi
1822 - Fix a potential memory smash in dhcpctl code.
1824 - Fix SunOS4 and (maybe) Ultrix builds.
1826 - Fix a bug where a certain sort of incoming packet could cause a core
1827 dump on Solaris (and probably elsewhere).
1829 - Add some more safety checks in error logging code.
1831 - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
1833 - Fix relay agent so that if an interface is specified on the command
1834 line, the relay agent does not dump core.
1836 - Fix class matching so that match if can be combined with match or
1839 - Do not allow spurious leases in the lease database to introduce
1840 potentially bogus leases into the in-memory database.
1842 - Fix a byte-order problem in the client hardware address type code
1845 - Be slightly less picky about what sort of hardware addresses OMAPI
1846 can install in host declarations.
1848 Changes since 3.0 Beta 2 Patchlevel 4
1850 - Incorporated Peter Marschall's proposed change to array/record
1851 parsing, which allows things like the slp-agent option to be encoded
1852 correctly. Thanks very much to Peter for taking the initiative to
1853 do this, and for doing such a careful job of it (e.g., updating the
1856 - Added an encoding for the slp-agent option. :')
1858 - Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
1859 request for help on this with patches!
1861 - Incorporated a change that should fix a problem reported by Philippe
1862 Jumelle where when the network connection between two servers is
1863 lost, they never reconnect.
1865 - Fix client script files other than that for NetBSD to actually use
1866 make_resolv_conf as documented in the manual page.
1868 - Fix a bug in the packet handling code that could result in a core
1871 - Fix a bug in the bootp code where responses on the local net would
1872 be sent to the wrong MAC address. Thanks to Jerry Schave for
1875 Changes since 3.0 Beta 2 Patchlevel 3
1877 - In the DHCP client, execute client statements prior to using the values
1878 of options, so that the client configuration can overried, e.g., the
1881 - Fix a reference counting error that would result in very reproducible
1882 failures in updates, as well as occasional core dumps, if a zone was
1883 declared without a key.
1885 - Fix some Linux 2.0 compilation problems.
1887 - Fix a bug in scope evaluation during execution of "on" statements that
1888 caused values not to be recorded on leases.
1890 - If the dhcp-max-message-size option is specified in scope, and the
1891 client didn't send this option, use the one specified in scope to
1892 determine the maximum size of the response.
1894 Changes since 3.0 Beta 2 Patchlevel 2
1896 - Fix a case where spawning subclasses were being allocated
1897 incorrectly, resulting in a core dump.
1899 - Fix a case where the DHCP server might inappropriately NAK a
1902 - Fix a place dhcprequest() where static leases could leak.
1904 - Include memory.h in omapip_p.h so that we don't get warnings about
1907 Changes since 3.0 Beta 2 Patchlevel 1
1909 - Notice when SIOCFIGCONF returns more data than fit in the buffer -
1910 allocate a larger buffer, and retry. Thanks to Greg Fausak for
1913 - In the server, if no interfaces were configured, report an error and
1916 - Don't ever record a state of 'startup'.
1918 - Don't try to evaluate the local failover binding address if none was
1919 specified. Thanks to Joseph Breu for finding this.