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 in the FQDN universe that added FQDN codes to the NWIP universe's
32 hash table was repaired.
34 - The servers now try harder to transmit pending binding updates when
35 entering normal state.
37 - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
38 requeues all pending updates. This should reduce the number of spurious
39 'xid mismatch' log mesasges.
41 Changes since 3.0 (New Features)
43 - A workaround for certain STSN servers that send a mangled domain-name
44 option was introduced for dhclient. The client will now accept corrupted
45 server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
46 or NAK). The server will continue to not accept corrupt client packets.
48 - Support for 'reserved' (psuedo-static) and BOOTP leases via failover
51 - Support for adding, removing, and managing class and subclass statements
54 - The failover implementation was updated to comply with revision 12 of
57 - 'make install' now creates the initial zero-length dhcpd.leases file if
58 one does not already exist on the system.
60 - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
62 - The Load Balance Algorithm was misimplemented. The current implementation
65 - lcase() and ucase() configuration expressions have been added which adjust
66 their arguments from upper to lower and lower to upper cases respectively.
67 Thanks to a patch from Albert Herranz.
69 - The dhclient 'reject ...;' statement, which rejects leases given by named
70 server-identifiers, now permits address ranges to be specified in CIDR
71 notation. Thanks to a patch from David Boyce.
73 - The subnet-mask option is now supplied by default, but at lowest
74 priority. This helps a small minority of clients that provide parameter
75 request lists, but do not list the subnet-mask option because they were
76 designed to interoperate with a server that behaves in this manner.
78 - The FQDN option is similarly supplied even if it does not appear on the
79 parameter request list, but not to the exclusion of options that do
80 appear at the parameter request list. Up until now it had ultimate
81 priority over the client's parameter request list.
83 - Varying option space code and length bit widths (8/16/32) are now
84 supported. This is a milestone in achieving RFC 3925 "VIVSO" and
87 - A new common (server or client) option, 'db-time-format local;', has
88 been added which prints the local time in /var/db/dhcpd.leases rather
89 than UTC. Thanks to a patch from Ken Lalonde.
91 - Some patches to improve DHCP Server startup speed from Andrew Matheson
92 have been incorporated.
94 - Failover pairs now implement 'MAC Affinity' on leases moving from the
95 active to free states. Leases that belonged to the failover secondary
96 are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
97 If lease rebalancing must move leases, it tries first to move leases
98 that belong to the peer in need.
100 - The server no longer sends POOLREQ messages unless the pool is severely
101 misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
103 - Pool rebalance events no longer happen upon successfully allocating a
104 lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
105 min-balance and max-balance statements for more information.
107 - The DHCP Relay Agent Information Option / Link Selection Sub-Option
108 is now supported. (See RFC3527 for details).
110 - A new DDNS related server option, update-conflict-detection, has been
111 added. If this option is enabled, dhcpd will perform normal DHCID
112 conflict resolution (the default). If this option is disabled, it will
113 instead trust the assigned name implicitly (removing any other bindings
114 on that name). This option has not been made available in dhclient.
116 - In those cases where the DHCP software manufactures an IP header (to
117 transmit via bpf, lpf, etc), the IP TTL the software selects has been
118 increased from 16 to 128. This is intended to match Microsoft Windows
119 DHCP Client behaviour, to increase compatibility.
121 - 'ignore client-updates;' now has behaviour that is different from
122 'deny client-updates;'. The client's request is not truly ignored,
123 rather it is encouraged. Should this value be configured, the server
124 updates DNS as though client-updates were set to 'deny'. That is, it
125 enters into DNS whatever it is configured to do already, provided it is
126 configured to. Then it sends a response to the client that lets the
127 client believe it is performing client updates (which it will), probably
128 for a different name. In essence, this lets the client do as it will,
129 ignoring this aspect of their request.
131 - Support for compressed 'domain name list' style DHCP option contents, and
132 in particular the domain search option (#119) was added.
134 - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
135 LEASEQUERY lets you query the DHCP server for information about a lease,
136 using either an IP address, MAC address, or client identifier. Thanks
137 to a patch from Justin Haddad.
139 - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
140 ethernet mac address) on the SCO platform specifically without any strange
141 ifconfig hacks. Many thanks go to the Kroger Co. for donating the
142 hardware and funding the development.
144 - A new common configuration executable statement, execute(), has been
145 added. This permits dhcpd or dhclient to execute a named external
146 program with command line arguments specified from other configuration
147 language. Thanks to a patch written by Mattias Ronnblom, gotten to us
150 - A new dhcp server option 'adaptive-lease-time-threshold' has been added
151 which causes the server to substantially reduce lease-times if there are
152 few (configured percentage) remaining leases. Thanks to a patch submitted
155 - Encapsulated option spaces within encapsulated option spaces is now
158 Changes since 3.0.5rc1
160 - A bug was repaired in fixes to the dhclient, which sought to run the
161 dhclient-script with the 'EXPIRE' state should it receive a NAK in
162 response to a REQUEST. The client now iterates the PREINIT state
163 after the EXPIRE state, so that interfaces that might be configured
164 'down' can be brought back 'up' and initialized.
166 - DHCPINFORM handling for clients that properly set ciaddr and come to the
167 server via a relay aget has been repaired.
171 - A warning that host statements declared within subnet or shared-network
172 scopes are actually global has been added.
174 - The default minimum lease time (if min-lease-time was not specified)
175 was raised from 0 to 300. 0 is not thought to be sensible, and is
176 known to be damaging.
178 - Added additional fatal error sanity checks surrounding lease binding
179 state count calculations (free/active counts used for failover pool
182 - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
183 misapplied to server values rather than client values. The server no longer
184 advertises 8-byte lease-time options when on 64-bit platforms.
186 - A bug where leases not in ACTIVE state would get billed to billed classes
187 (classes with lease limitations) was fixed. Non-active leases OFFERed
188 to clients are no longer billed (but billing is checked before offering).
190 - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
191 configuration option - the default configuration and results should be
194 - If the dhclient were to receive a DHCPNAK while it was in the RENEW
195 state (and consequently, had an active, 'bound' address and related
196 configuration options), it would fail to 'tear down' this information
197 before proceeding into INIT state. dhclient now iterates the dhclient-
198 script with the 'EXPIRE' action to cause these teardowns prior to entering
199 INIT state. Thanks to a patch from Chris Zimmerman.
201 - The omapi.1 manpage had some formatting errors repaired thanks to a patch
202 from Yoshihiko Sarumaru.
204 - A few lines of code that were failover-specific were moved within
205 #if defined() clauses so that compilation without failover could be
208 - The log message emitted when the 'leased-address' value was not available
209 in dhcpd.conf "executable statements" has been updated to be more helpful.
210 Manpage information for this value has also been updated.
212 - Abandoned or dissociated (err condition) leases now remove any related
213 dynamic dns bindings. Thanks to a patch from Patrick Schoo.
215 - Attempting to write a new lease file to replace a corrupt (due to
216 encountering non-retryable errors during writing) lease file should
217 no longer result in an infinite recursion.
219 - Host declaration hardware addresses and client identifiers may only be
220 configured once. dhcpd will now fail to load config files that specify
221 multiple identifiers (previous versions would silently over-ride the
222 value with the later configured value).
224 - Several option codes that have been allocated since our last release
225 have been named and documented.
227 - Option names of the form "unknown-123" have been removed from the in-
228 memory hash tables. In order to support options of these names that
229 may appear in dhclient.leases or similar in previous versions, the
230 parser will now find the new option code definition, or mock up a
231 generic option code definition. This should result in a smooth
232 transition from one name to the other, as the new name is used to
235 Changes since 3.0.4rc1
237 - The dhcp-options.5 manpage was updated to correct indentation errors
238 thanks to a patch from Jean Delvare.
240 Changes since 3.0.4b3
242 - Some manual pages were clarified pursuant to discussion on the dhcp-server
245 - Support for compressed 'domain name list' style DHCP option contents, and
246 in particular the domain search option (#119) was added.
248 Changes since 3.0.4b2
250 - Null-termination sensing for certain clients that unfortunatley require
251 it in DHCPINFORM processing was repaired.
253 - The host-name option and a few others were moved from "X" format to "t"
254 format to be compatible with new NULL handling functions.
256 - DHCPINFORM processing is a little more careful about return addressing
257 its responses, or if responding via a relay. The INFORM related
258 messages also log the 'effective client ip address' rather than the
259 client's supplied ciaddr (since some clients produce null ciaddrs).
261 - The server was inappropriately sending leases to the RESET state in the
262 event that multiple active leases were found to match a singly-identified
263 client. This was changed to RELEASED (by accepting a different, ACTIVE
264 binding, the client is implicitly releasing its lease). This repairs a
265 bug wherein secondary servers in failover pairs detecting this condition
266 move leases to RESET, and primaries refuse to accept that state
267 transition (properly).
269 - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
271 Changes since 3.0.4b1
273 - Command line parsing in omshell was repaired - it no longer closes
274 STDIN after reading one line.
276 - The resolver library no longer closes the /etc/resolv.conf file
277 descriptor it opened twice.
279 - Changes to trailing NULL removal in 't' option-atoms has been rethought,
280 it now includes 'd' (domain name) types, and tries hard not to rewind an
281 option beyond the start of the text field it is un-terminating.
285 - A DDNS update handling function was misusing the DNS error codes, rather
286 than the internal generic result enumeration. The result is a confusing
287 syslog line, logging the wrong condition.
289 - The DHCP Server was not checking pool balance in the case where it brought
290 a non-ACTIVE lease out of storage for a client that was returning to use
291 a lease it once had long ago, and had since expired.
293 - Failover peers no longer bother to look for free leases to allocate when
294 they already found the client's ACTIVE lease. DISCOVERs are load balanced
295 wether freely-allocated or not, unless the server doubts the peer has
298 - Fixed a bug in dhcrelay agent addition code that suppressed trailing
299 PAD options - it was suppressing only one trailng PAD option, rather
300 than the entire block of them.
302 ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
303 option addition and stripping code. Added a few sanity checks. Although
304 highly improbable, due to requiring the reception of a DHCP datagram well
305 in excess of all known to be used physical MTU limitations, it is possible
306 this may have been used in a stack overflow security vulnerability. Thanks
307 to a patch from infamous42md.
309 ! Added some sanity checks to OMAPI connection/authentication code.
310 Although highly improbable, due to having to deliver in excess of 2^32
311 bytes of data via the OMAPI channel, not to mention requiring dhcpd to
312 be able to malloc() a memory region 2^32 bytes in size, it was possible
313 this might have resulted in a heap overflow security vulnerability.
314 Thanks to a patch from infamous42md.
316 - dmalloc() memset()'s the non-debug (data) portion of the allocated
317 memory to zero. Code that memset()'s the result returned by dmalloc() to
318 zero is redundant. These redundancies were removed.
320 - Some type declaration corrections to u_int16_t were made in common/tr.c
321 (Token Ring support) thanks to a patch from Jason Vas Dias at RedHat.
323 - A failover bug that was allowing leases that EXPIRED or were RELEASED
324 where tsfp and tstp are identical timestamps to languish in these
325 transitional states has been repaired. As a side effect, lease
326 databases should be kept more consistent overall, not just for these
329 - If the lease db is deleted out from under the daemon, and it moves to rewrite
330 the db, it will go ahead with the operation and move the new db into place
331 once it detects the old db does not exist.
333 - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
334 is either nonsensical or (in the case of IEEE1394) is not known to support
335 these interfaces. Thanks to Marius Gedminas and Andrew Pollock of Debian.
337 - Some previously undocumented reasons for dhclient-script invoking has
338 been doucmented in the dhclient-script.8 manpage.
340 - Failover potential expiry calculations (TSTP) have been corrected. Results
341 should be substantially more consistent, and proper given the constraints.
343 - Adjusted lease state validation checks in potential-conflict, to
344 account for possible clock skew similarly to normal state, and several
345 previously illegal transitions were made legal (ex: active->released).
347 - An impossible sanity check was removed from omapi/buffer.c, thanks to a
348 patch from 'infamous42md'.
350 - An OMAPI host/network byte order problem in lease time values has been
353 - Several minor bugs, largely relating to treating 8-byte time values as
354 4-byte entities, have been repaired after careful review of the FreeBSD
355 ports collection's patch set. Thanks to the nameless entities who have
356 contributed to the FreeBSD ports.
358 - When writing a trace file, the file is now created with permissions 0600,
359 to help administrators avoid accidentally publicising sensitive config
362 - The calculation of the maximum size of DHCP packets no longer includes
363 Ethernet framing overhead. The result is that the 'Maximum Message
364 Size' option advertised by clients, or the default value 576, is no
365 longer reduced by 14 bytes, and instead directly reflects the IP level
366 MTU (and the default, minimum allowed IP MTU of 576).
368 - The special status of RELEASED/EXPIRED/RESET leases when a server
369 is operating in partner-down was fixed. It no longer requires a
370 lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
371 event to turn these into FREE leases without peer acknowledgement
372 (after STOS+MCLT) has been repaired.
374 - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
377 - "append"ing a string onto the end of a "t" type option (such as the
378 domain-name field) that had been improperly NULL-terminated by the
379 DHCP server will no longer result in a truncated string containing
380 only the option from the server, and not the expected appended value.
381 Thanks to a patch from Jason Vas Dias at RedHat.
383 - File handlers on configuration state (config files and lease dbs) should
384 be treated consistently, regardless of wether TRACING is defined or not.
386 - The linux build environment has had some minor improvements - better
387 sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
388 and corrections to #if operators regarding LINUX_MAJOR should it ever
391 - The server now tries harder to survive the condition where it is unable
392 to open a new lease file to rewrite the lease state database.
394 Changes since 3.0.3b3
396 - dhclient.conf documentation for interface {} was updated to reflect recent
397 discussion on the dhcp-hackers mailing list.
399 - In response to reports that the software does not compile on GCC 4.0.0,
400 -Werror was removed from Makefile.conf for all platforms that used it.
401 We will address the true problem in a future release; this is a temporary
404 Changes since 3.0.3b2
406 - An error in code changes introduced in 3.0.3b2 was corrected, which caused
407 static BOOTP clients to receive random addresses.
409 Changes since 3.0.3b1
411 - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
412 host records would be left behind on leases that were not allocated to the
413 client currently booting (eg in the case where the host was denied booting).
415 - The dhcpd.conf.5 manpage was updated to be more clear in regards to
416 multiple host declarations (thanks to Vincent McIntyre). 'Interim' style
417 dynamic updates were also retouched.
421 - A bug was fixed where a server might load balance a DHCP REQUEST to its
422 peer after already choosing not to load balance the preceeding DISCOVER.
423 The peer cannot allocate the originating server's lease.
425 - In the case where a secondary server lost its stable storage while the
426 primary was still in communications-interrupted, and came back online,
427 the lease databases would not be fully transferred to the secondary.
428 This was due to the secondary errantly sending an extra UPDREQ message
429 when the primary made its state transition to PARTNER-DOWN known.
431 - The package will now compile cleanly in gcc 3.3 and 3.4. As a side effect,
432 lease structures will be 9 bytes smaller on all platforms. Thanks to
433 Jason Vas Dias at Redhat.
435 - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
436 properly restricted to only detecting broadcast interfaces. Thanks
437 to a patch from Jason Vas Dias at RedHat.
439 - decode_udp_ip_header was changed so that the IP address was copied out
440 to a variable, rather than referenced by a pointer. This enforces 4-byte
441 alignment of the 32-bit IP address value. Thanks to a patch from Dr.
444 - An incorrect log message was corrected thanks to a patch from
447 - A bug in DDNS was repaired, where if the server's first DDNS action was
448 a DDNS removal rather than a DDNS update, the resolver library's
449 retransmit timer and retry timer was set to the default, implying a
450 15 second timeout interval. Which is a little excessive in a synchronous,
451 single-threaded system. In all cases, ISC DHCP should now hold fast to
452 a 1-second timeout, trying only once.
454 - The siaddr field was being improperly set to the server-identifier when
455 responding to DHCP messages. RFC2131 clarified the siaddr field as
456 meaning the 'next server in the bootstrap process', eg a tftp server.
457 The siaddr field is now left zeroed unless next-server is configured.
459 - mockup_lease() could have returned in an error condition (or in the
460 condition where no fixed-address was found matching the shared
461 network) with stale references to a host record. This is probably not
462 a memory leak since host records generally never die anyway.
464 - A bug was repaired where failover servers would let stale client identifiers
465 persist on leases that were reallocated to new clients not sending an id.
467 - Binding scopes ("set var = value;") are now removed from leases allocated
468 by failover peers if the lease had expired. This should help reduce the
469 number of stale binding scopes on leases.
471 - A small memory leak was closed involving client identifiers larger than
472 7 bytes, and failover.
474 - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
475 cause an internal function to overflow heap. Thanks to Jason Vas Dias
478 - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
479 or 'NUMBER_OR_NAME' was repaired. Hexadecimal parsing is affected, and
482 - In several cases, parse warnings were being issued before the lexical
483 token had been advanced to the token whose value was causing an error...
484 causing parse warnings to claim the problem is on the wrong token.
486 - Host declarations matching on client identifier for dynamic leases will
487 no longer match fixed-address host declarations (this is now identical
488 to behaviour for host records matching on hardware address).
490 Changes since 3.0.2rc3
492 - A previously undocumented configuration directive, 'local-address',
493 was documented in the dhcpd.conf manpage.
495 Changes since 3.0.2rc2
497 - Two varaibles introduced in 3.0.2b1 were used without being initialized
498 in the case where neither the FILE nor SNAME fields were available for
499 overloading. This was repaired.
501 - A heretofore believed to be impossible corner case of the option
502 overloading implementation turned out to be possible ("Unable to sort
503 overloaded options after 10 tries."). The implementation was reworked
504 to consider the case of an option so large it would require more than
507 - Many other instances of variables being used without being initialized
510 - An uninitialized variable in omapi_io_destroy() led to the discovery
511 that this function may result in orphaned pointers (and hence, a memory
514 Changes since 3.0.2rc1
516 - allocate_lease() was rewritten to repair a bug in which the server would
517 try to allocate an ABANDONED lease when FREE leases were available.
519 Changes since 3.0.2b1
521 - Some dhcp-eval.5 manpage formatting was repaired.
525 - A bug was fixed in the server's 'option overloading' implementation,
526 where options loaded into the 'file' and 'sname' packet fields were
527 not aligned precisely as rfc2131 dictates.
529 - The FreeBSD client script was changed to support the case where a domain
530 name was not provided by the server.
532 - A memory leak in 'omshell' per each command line parsed was
533 repaired, thanks to a patch from Jarkko Torppa.
535 - Log functions writing to stderr were adjusted to use the STDERR_FILENO
536 system definition rather than '2'. This is a no-op for 90% of platforms.
538 - One call to trace_write_packet_iov() counted the number of io vectors
539 incorrectly, causing inconsistent tracefiles. This was fixed.
541 - Some expression parse failure memory leaks were closed.
543 - A host byte order problem in tracefiles was repaired.
545 - Pools configured in DHCPD for failover possessing permission lists that
546 previously were assumed to not include dyanmic bootp clients are now
547 a little more pessimistic. The result is, dhcpd will nag you about just
548 about most pools that possess a 'allow' statement with no 'deny' that
549 would definitely match a dynamic bootp client.
551 - The 'ddns-update-style' configuration warning bit now insists that
552 the configuration be globally scoped.
554 - Two memory leaks in dhclient were closed thanks to a patch from Felix
557 - Some minor but excellently pedantic documentation errors were fixed
558 thanks to a patch from Thomas Klausner.
560 - Bugs in operator precedence in executable statements have been repaired
561 once again. More legal syntaxes should be parsed legally.
563 - Failing to initialize a tracefile for any reason if a tracefile was
564 specified is now a fatal error. Thanks to a patch from Albert Herranz.
566 - Corrected a bug in which the number of leases transferred as calculated
567 by the failover primary and sent to peers in POOLRESP responses may be
568 incorrect. This value is not believed to be used by other failover
569 implementations, excepting perhaps as logged information.
571 - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
572 sending POOLREQ messages instead of POOLRESP mesasges. This message
573 was essentially ignored since failover secondaries effectively do not
574 respond to POOLREQ messages.
576 - Type definitions for various bitwidths of integers in the sunos5-5
577 build of ISC DHCP have been fixed. It should compile and run more
578 easily when built in 64-bit for this platform.
580 - "allow known-clients;" is now a legal syntax, to avoid confusion.
582 - If one dhcp server chooses to 'load balance' a request to its failover
583 peer, it first checks to see if it believes said peer has a free
584 lease to allocate before ignoring the DISCOVER.
586 - log() was logging a work buffer, rather than the value returned by
587 executing the statements configured by the user. In some cases,
588 the work buffer and the intended results were the same. In some other
589 cases, they were not. This was fixed thanks to a patch from Gunnar
590 Fjone and directconnect.no.
592 - Compiler warnings for some string type conversions was fixed, thanks
593 to Andreas Gustafsson.
595 - The netbsd build environments were simplified to one, in which
596 -Wconversion is not used, thanks to Andreas Gustafsson.
598 - How randomness in the backoff-cutoff dhclient configuration variable
599 is implemented was better documented in the manpage, and the behaviour
600 of dhclient in REQUEST timeout handling was changed to match that of
601 DISCOVER timeout handling.
603 - Omapi was hardened against clients that pass in null values, thanks
604 to a patch from Mark Jason Dominus.
606 - A bug was fixed in dhclient that kept it from doing client-side
607 ddns updates. Thanks to a patch from Andreas Gustafsson, which
608 underwent some modification after review by Jason Vas Dias.
610 - Failover implementations disconnected due to the network between
611 them (rather than one of the two shutting down) will now try to
612 re-establish the failover connection every 5 seconds, rather than
613 to simply try once and give up until one of them is restarted.
614 Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
615 by Greger V. Teigre which led to an enhancement to it.
617 - A problem that kept DHCP Failover secondaries from tearing down
618 ddns records was repaired. Thanks to a patch from Ulf Ekberg from
621 - 64bit pointer sizes are detected properly on FreeBSD now.
623 - A bug was repaired where the DHCP server would leave stale references
624 to host records on leases it once thought about offering to certain
625 clients. The result would be to apply host and 'known' scopes to the
626 wrong clients (possibly denying booting). NOTE: The 'mis-host' patch
627 that was being circulated as a workaround is not the way this bug was
628 fixed. If you were a victim of this bug in 3.0.1, you are cautioned
629 to proceed carefully and see if it fixes your problem.
631 - A bug was repaired in the server's DHCPINFORM handling, where it
632 tried to divine the client's address from the source packet and
633 would get it wrong. Thanks to Anshuman Singh Rawat.
635 - A log message was introduced to help illuminate the case where the
636 server was unable to find a lease to assign to any BOOTP client.
637 Thanks to Daniel Baker.
639 - A minor dhcpd.conf.5 manpage error was fixed.
641 Changes since 3.0.1rc14
643 - The global variable 'cur_time' was centralized and is now uniformly of a
644 type #defined in system-dependent headers. It had previously been defined
645 in one of many places as a 32-bit value, and this causes mayhem on 64-bit
646 big endian systems. It probably wasn't too healthy on little endian
649 - A printf format string error introduced in rc14 was repaired.
651 - AIX system-dependent header file was altered to only define NO_SNPRINTF
652 if the condition used to #ifdef in vsnprintf in AIX' header files
655 - The Alpha/OSF system-dependent header file was altered to define
656 NO_SNPRINTF on OS revisions older than 4.0G.
658 - omapip/test.c had string.h added to its includes.
660 Changes since 3.0.1rc13
662 ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
663 in logging messages with excessively long hostnames provided by the
664 clients. It is highly probable that these could have been used by
665 attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
666 release candidates 12 or 13. Special thanks to Gregory Duchemin for
667 both finding and solving the problem.
669 ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
670 in log_*() functions was evidented, on some specific platforms where
671 vsnprintf() was not believed to be available and calls were wrapped to
672 sprintf() instead. Again, credit goes to Gregory Duchemin for finding
673 the problem. Calls to snprintf() are now linked to a distribution-local
674 snprintf implementation, only in those cases where the architecture is
675 not known to provide one (see includes/cf/[arch].h). If you experience
676 linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
677 is where to look. This vulnerability did not exist in any previously
678 published version of ISC DHCP.
680 - Compilation on hpux 11.11 was repaired.
682 - 'The cross-compile bug fix' was backed out.
684 Changes since 3.0.1rc12
686 - Fixed a bug in omapi lease lookup function, to form the hardware
687 address for the hash lookup correctly, thanks to a patch from
690 - Fixed a bug where dhcrelay was sending relayed responses back to the
691 broadcast address, but with the source's unicast mac address. Should
692 now conform to rfc2131 section 4.1.
694 - Cross-compile bug fix; use $(AR) instead of ar. Thanks to Morten Brorup.
696 - Fixed a crash bug in dhclient where dhcpd servers that do not provide
697 renewal times results in an FPE. As a side effect, dhclient can now
698 properly handle 0xFFFFFFFF (-1) expiry times supplied by servers. Thanks
699 to a patch from Burt Silverman.
701 - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
702 and reformatted to correct a compilation error on solaris platforms.
704 - A patch was applied which fixes a case where leases read from the
705 leases database do not properly over-ride previously read leases.
707 - dhcpctl.3 manpage was tweaked.
709 Changes since 3.0.1rc11
711 - A patch from Steve Campbell was applied with minor modifications to
712 permit reverse dns PTR record updates with values containing spaces.
714 - A patch from Florian Lohoff was applied with some modifications to
715 dhcrelay. It now discards packets whose hop count exceeds 10 by default,
716 and a command-line option (-c) can be used to set this threshold.
718 - A failover bug relating to identifying peers by name length instead of
721 - Delcaring failover configs within shared-network statements should no
722 longer result in error.
724 - The -nw command line option to dhclient now works.
726 - Thanks to a patch from Michael Richardson:
727 - Some problems with long option processing have been fixed.
728 - Some fixes to minires so that updates of KEY records will work.
730 - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
731 see contrib/ms2isc/readme.txt for revision notes.
733 - Dhclient no longer uses shell commands to kill another instance of
734 itself, it sends the signal directly. Thanks to a patch from Martin
737 - The FreeBSD dhclient-script was changed so that a failure to write to
738 /etc/resolv.conf does not prematurely end the script. This keeps dhclient
739 from looping infinitely when this is the case. Thanks to a patch from
742 - A patch from Bill Stephens was applied which resolves a problem with lease
743 expiry times in failover configurations.
745 - A memory leak in configuration parsing was closed thanks to a patch from
748 - The function which discovers interfaces will now skip non-broadcast or
749 point-to-point interfaces, thanks to a patch from David Brownlee.
751 - Options not yet known by the dhcpd or dhclient have had their names
752 changed such that they do not contain # symbols, in case they should ever
753 appear in a lease file. An option that might have been named "#144" is
756 - Another patch from Bill Stephens which allows the ping-check timeout to
757 be configured as 'ping-timeout'. Defaults to 1.
759 Changes since 3.0.1rc10
761 - Potential buffer overflows in minires repaired.
763 - A change to the linux client script to use /bin/bash, since /bin/sh may
766 - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
768 - A correction of boolean parsing syntax validation - some illegal syntaxes
769 that worked before are now detected and produce errs, some legal syntaxes
770 that errored before will now work properly.
772 - Some search-and-replace errors that caused some options to change their
775 - Shu-min Chang of the Intel corporation has contributed a perl script and
776 module that converts the MS NT4 DHCP configuration to a ISC DHCP3
779 - Applied the remainder of the dhcpctl memory leak patch provided by Bill
780 Squier at ReefEdge, Inc. (groo@reefedge.com).
782 - Missing non-optional failover peer configurations will now result in a soft
783 error rather than a null dereference.
785 Changes since 3.0.1rc9
787 - A format string was corrected to fix compiler warnings.
789 - A number of spelling corrections were made in the man pages.
791 - The dhclient.conf.5 man page was changed to refer to do-forward-updates
792 rather than a configuration option that doesn't exist.
794 - A FreeBSD-specific bug in the interface removal handling was fixed.
796 - A Linux-specific Token Ring detection problem was fixed.
798 - Hashes removed from as-yet-unknown agent options, having those options
799 appear in reality before we know about them will no longer produce
800 self-corrupting lease databases.
802 - dhclient will use the proper port numbers now when using the -g option.
804 - A order-of-operations bug with 2 match clauses in 1 class statement is
805 fixed thanks to a patch from Andrew Matheson.
807 - Compilation problems on Solaris were fixed.
809 - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
811 - A fix to the dhcp ack process which makes certain group options will be
812 included in the first DHCPOFFER message was made thanks to a patch from
815 - A few memory leaks were repaired thanks to patches from Bill Squier at
816 ReefEdge, Inc. (groo@reefedge.com).
818 - A fix for shared-networks that sometimes give clients options for the
819 wrong subnets (in particular, 'option routers') was applied, thanks to
820 Ted Lemon for the patch.
822 - Omshell's handling of dotted octets as values was changed such that dots
823 one after the other produce zero values in the integer string.
825 Changes since 3.0.1rc8
827 - Fix a format string vulnerability in the server that could lead to a
828 remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
830 - Add additional support for NetBSD/sparc64.
832 - Fix a bug in the command-line parsing of the client. Also, resolve
835 - Add better support for shells other than bash in the Linux client
838 - Various build fixes for modern versions of FreeBSD and Linux.
840 - Fix a bad bounds check when printing binding state names.
842 - Clarify documentation about fixed-address and multiple addresses.
844 - Fix a typo in the authoritative error message.
846 - Make a log entry when we can't write a billing class.
848 - Use conversion targets that are the right size on all architectures.
850 - Increment the hop count when relaying.
852 - Log a message when lease state is changed through OMAPI.
854 - Don't rerun the shared_network when evaluating the pool.
856 - Fix a reversed test in the parser.
858 - Change the type of rbuf_max.
860 - Make FTS_LAST a manifest constant to quiet warnings.
862 Changes since 3.0.1rc7
864 - Fix two compiler warnings that are generated when compiling on Solaris
865 with gcc. These stop the build, even though they weren't actually
866 errors, because we prefer that our builds generate no warnings.
868 Changes since 3.0.1rc6
870 - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
873 - Implement lease stealing for cases where the primary has fewer leases
874 than the secondary, as called for by the standard.
876 - Add a fudge factor to the lease expiry acceptance code, (suggested
877 by Kevin Miller of CMU).
879 - Fix a bug in permit_list_match that made it much too willing to say
880 that two permit lists matched.
882 - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
883 also more compact) messages about DNS updates.
885 - Fix a bug in generating wire-format domain names for the FQDN option.
887 - Fix a bug where the FQDN option would not be returned if the client
888 requested it, contrary to the standard.
890 - On Darwin, use the FreeBSD DHCP client script.
892 - On NetBSD/sparc, don't check for casting warnings.
894 - Add a flag in the DHCP client to disable updating the client's A
895 record when sending an FQDN option indicating that the client is
896 going to update its A record.
898 - In the client, don't attempt a DNS update until one second after
899 configuring the new IP address, and if the update times out, keep
900 trying until a response, positive or negative, is received from the
903 - Fix an uninitialized memory bug in the DHCP client.
905 - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
907 - Fix a bug in ns_parserr(), where it was returning the wrong sort
908 of result code in some cases (suggested by Ben Harris of the
911 - Fix a bug in is_identifier(), where it was checking against EOF
912 instead of the END_OF_FILE token (also suggested by Ben Harris).
914 - Fix a bug where if an option universe contained no options, the
915 DHCP server could dump core (Walter Steiner).
917 - Fix a bug in the handling of encapsulated options.
919 - Fix a bug that prevented NWIP suboptions from being processed.
921 - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
922 as modifier flags to the FTS_ACTIVE state, as called for in the
923 failover protocol standard.
925 - Fix bugs in the pool merging code that resulted in references and
926 dereferences of null pointers. This bug had no impact unless the
927 POINTER_DEBUG flag was defined.
929 - In the server, added a do-forward-updates flag that can be used to
930 disable forward updates in all cases, so that sites that want the
931 clients to take sole responsibility for updating their A record can
934 - Make it possible to disable optimization of PTR record updates.
936 Changes since 3.0.1rc5
938 - Include some new documentation and changes provided by Karl Auer.
940 - Add a workaround for some Lexmark printers that send a double-NUL-
941 terminated host-name option, which would break DNS updates.
943 - Fix an off-by-one error in the MAC-address checking code for
944 DHCPRELEASE that was added in 3.0.1rc5.
946 - Fix a bug where client-specific information was not being discarded
947 from the lease when it expired or was released, resulting in
948 problems if the lease was reallocated to a different client.
950 - If more than one allocation pool is specified that has the same set
951 of constraints as another allocation pool on the same shared
952 network, merge the two pools.
954 - Don't print an error in fallback_discard, since this just causes
955 confusion and does not appear to be helping to encourage anyone to
958 Changes since 3.0.1rc4
960 - Fix a bug that would cause the DHCP server to spin if asked to parse
961 a certain kind of incorrect statement.
963 - Fix a related bug that would prevent an error from being reported in
966 - Additional documentation.
968 - Make sure that the hardware address matches the lease when
969 processing a DHCPRELEASE message.
971 Changes since 3.0.1rc3
973 - A minor bug fix in the arguments to a logging function call.
974 - Documentation update for dhcpd.conf.
976 Changes since 3.0.1rc2
978 - Allow the primary to send a POOLREQ message. This isn't what the current
979 failover draft says to do, so we may have to back it out if I can't get the
980 authors to relent, but the scheme for balancing that's specified in the
981 current draft seems needlessly hairy, so I'm floating a trial balloon.
982 The rc1 code did not implement the method described in the draft either.
984 Changes since 3.0.1rc1
986 - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
987 domain or RRSET. This allows the DHCP server to forget about a name
988 it added to the DNS once it's been removed, even if the DHCP server
989 wasn't the one that removed it.
991 - Install defaults for failover maximum outstanding updates and maximum
992 silent time. This prevents problems that might occur if these values
995 - Don't do DDNS deletes if ddns-update-style is none.
997 - Return relay agent information options in DHCPNAK. This prevents DHCPNAK
998 messages from being dropped when the relay agent information option contains
1001 - Fix a problem where coming up in recover wouldn't result in an update
1004 - Add some more chatty messages when we start a recovery update and when it's
1007 - Fix a possible problem where some state might have been left around
1008 after the peer lost contact and regained contact about how many updates
1011 - Don't nix a lease update because of a lease conflict. This test has
1012 never (as far as I know) prevented a mistake, and it appears to cause
1013 problems with failover.
1015 - Add support in rc history code for keeping a selective history, rather
1016 than a history of all references and dereferences. This code is only used
1017 when extensive additional debugging is enabled.
1021 - Make allocators for hash tables. As a side effect, this fixes a memory
1022 smash in the subclass allocation code.
1024 - Fix a small bug in omshell where if you try to close an object when
1025 no object is open, it dumps core.
1027 - Fix an obscure coredump that could occur on shutdown.
1029 - Fix a bug in the recording of host declaration rubouts in the lease file.
1031 - Fix two potential spins in the host deletion code.
1033 - Fix a core dump that would happen if an application tried to update
1034 a host object attribute with a null value.
1036 Changes since 3.0 Release Candidate 12
1038 - Fix a memory leak in the evaluation code.
1040 - Fix an obscure core dump.
1042 - Print a couple of new warnings when parsing the configuration file
1043 when crucial information is left out.
1045 - Log "no free leases" as an error.
1047 - Documentation updates.
1049 Changes since 3.0 Release Candidate 11
1051 - Always return a subnet selection option if one is sent.
1053 - Fix a warning that was being printed because an automatic data
1054 structure wasn't zeroed.
1056 - Fix some failover state transitions that were being handled
1059 - When supersede_lease is called on a lease whose end time has already
1060 expired, but for which a state transition has not yet been done, do
1061 a state transition. This fixes the case where if the secondary
1062 allocated a lease to a client and the lease "expired" while the
1063 secondary was in partner-down, no expiry event would actually
1064 happen, so the lease would remain active until the primary was
1067 Changes since 3.0 Release Candidate 10
1069 - Fix a bug that was preventing released leases from changing state
1070 in failover-enabled pools.
1072 - Fix a core dump in the client identifier finder code (for host
1075 - Finish fixing a bug where bogus data would sometimes get logged to
1076 the dhclient.leases file because it was opened as descriptor 2.
1078 - Fix the Linux dhclient-script according to suggestions made by
1079 several people on the dhcp-client mailing list.
1081 - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
1083 - Print an error message and refuse to run if a failover peer is
1084 defined but not referenced by any pools.
1086 - Correct a confusing error message in failover.
1088 Changes since 3.0 Release Candidate 9
1090 - Fix a bug in lease allocation for Dynamic BOOTP clients.
1092 Changes since 3.0 Release Candidate 8 Patchlevel 2
1094 - Fix a bug that prevented update-static-leases from working.
1096 - Document failover-state OMAPI object.
1098 - Fix a compilation error on SunOS 4.
1100 Changes since 3.0 Release Candidate 8 Patchlevel 1
1102 - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
1103 This was introduced in rc8pl1 as an unintended result of the memory
1104 leakage fixes that were in pl1.
1106 - Fix a long-standing bug where the server would record that an update
1107 had been done for a client with no name, even though no update had
1108 been done, and then when the client's lease expired the deletion of
1109 that nonexistant record would time out because the name was the null
1112 - Clean up the omshell, dhcpctl and omapi man pages a bit.
1114 Changes since 3.0 Release Candidate 8
1116 - Fix a bug that could cause the DHCP server to spin if
1117 one-lease-per-client was enabled.
1119 - Fix a bug that was causing core dumps on BSD/os in the presence of
1122 - In partner-down state, don't restrict lease lengths to MCLT.
1124 - On the failover secondary, record the MCLT received from the primary
1125 so that if we come up without a connection to the primary we don't
1126 wind up giving out zero-length leases.
1128 - Fix some compilation problems on BSD/os.
1130 - Fix a bunch of memory leaks.
1132 - Fix a couple of bugs in the option printer.
1134 - Fix an obscure error reporting bug in the dns update code, and also
1135 make the message clearer when a key algorithm isn't supported.
1137 - Fix a bug in the tracing code that prevented trace runs that used
1138 tcp connections from being played back.
1140 - Add some additional debugging capability for catching memory leaks
1143 - Make the client release the lease correctly on shutdown.
1145 - Add some configurability to the build system.
1147 - Install omshell manual page in man1, not man8.
1149 - Craig Gwydir sent in a patch that fixes a long-standing bug in the
1150 DHCP client that could cause core dumps, but that for some reason
1151 hadn't been noticed until now.
1153 Changes since 3.0 Release Candidate 7
1155 - Fix a bug in failover where we weren't sending updates after a
1156 transition from communications-interrupted to normal.
1158 - Handle expired/released/reset -> free transition according to the
1159 protocol specification (this works - the other way not only wasn't
1160 conformant, but also didn't work).
1162 - Add a control object in both client and server that allows either
1163 daemon to be shut down cleanly.
1165 - When writing a lease, if we run out of disk space, shut down the
1166 output file and insist on writing a new one before proceeding.
1168 - In the server, if the OMAPI listener port is occupied, keep trying
1169 to get it, rather than simply giving up and exiting.
1171 - Support fetching variables from leases and also updating and adding
1172 variables to leases via OMAPI.
1174 - If two failover peers have wildly different clocks, refuse to start
1177 - Fix a bug in the DNS update code that could cause core dumps when
1178 running on alpha processors.
1180 - Fixed a bug in ddns updates for static lease entries, thanks to a
1181 patch from Andrey M Linkevitch.
1183 - Add support for Darwin/MacOS X
1185 - Install omshell (including new documentation).
1187 - Support DNS updates in the client (this is a very obscure feature
1188 that most DHCP client users probably will not be able to use).
1190 - Somewhat cleaner status logging in the client.
1192 - Make OMAPI key naming syntax compatible with the way keys are
1193 actually named (key names are domain names).
1195 - Fix a bug in the lease file writer.
1197 - Install DHCP ISC headers in a different place than BIND 9 ISC
1198 headers, to avoid causing trouble in BIND 9 builds.
1200 - Don't send updates for attributes on an object when the attributes
1201 haven't changed. Support deleting attributes on remote objects.
1203 - Fix a number of bugs in omshell, and add the unset and refresh
1206 - Handle disconnects in OMAPI a little bit more intelligently (so that
1207 the caller gets ECONNRESET instead of EINVAL).
1209 - Fix a bunch of bugs in the handling of clients that have existing
1210 leases when the try to renew their leases while failover is
1213 Changes since 3.0 Release Candidate 6
1215 - Fix a core dump that could happen when processing a DHCPREQUEST from
1216 a client that had a host declaration that contained both a
1217 fixed-address declaration and a dhcp-client-identifier option
1218 declaration, if the client identifier was longer than nine bytes.
1220 - Fix a memory leak that could happen in certain obscure cases when
1221 using omapi to manipulate leases.
1223 - Fix some bugs and omissions in omshell.
1226 Changes since 3.0 Release Candidate 5
1228 - Fix a bug in omapi_object_dereference that prevented objects in
1229 chains from having their reference counts decreased on dereference.
1231 - Fix a bug in omapi_object_dereference that would prevent object
1232 chains from being freed upon removal of the last reference external
1235 - Fix a number of other memory leaks in the OMAPI protocol subsystem.
1237 - Add code in the OMAPI protocol handler to trace memory leakage.
1239 - Clean up the memory allocation/reference history printer.
1241 - Support input of dotted quads and colon-separated hex lists as
1242 attribute values in omshell.
1244 - Fix a typo in the Linux interface discovery code.
1246 - Conditionalize a piece of trace code that wasn't conditional.
1248 Changes since 3.0 Release Candidate 4
1250 - Fix a bug that would prevent leases from being abandoned properly on
1253 - Fix failover peer OMAPI support.
1255 - In failover, correctly handle expiration of leases. Previously,
1256 leases would never be reclaimed because they couldn't make the
1257 transition from EXPIRED to FREE.
1259 - Fix some broken failover state transitions.
1261 - Documentation fixes.
1263 - Take out an unnecessary check in DHCP relay agent information option
1264 stashing code that was preventing REBINDING clients from rebinding.
1266 - Prevent failover peers from allocating leases in DHCPREQUEST
1267 processing if the lease belongs to the other server.
1269 - Record server version in lease file introductory comment.
1271 - Correctly report connection errors in OMAPI and failover.
1273 - Make authentication signature algorithm name comparisons in OMAPI
1276 - Fix compile problem on SunOS 4.x
1278 - If a signature algorithm is not terminated with '.', terminate it so
1279 that comparisons between fully-qualified names will work
1282 - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
1283 systems with the probe not working correctly.
1285 - Don't allow user to type omapi key on command line of omshell.
1287 Changes since 3.0 Release Candidate 3
1289 - Do lease billing on startup in a way that I *think* will finally do
1290 the billing correctly - the previous method could overbill as a
1291 result of duplicate leases.
1293 - Document OMAPI server objects.
1295 Changes since 3.0 Release Candidate 2 Patchlevel 1
1297 - Fix some problems in the DDNS update code. Thanks to Albert
1298 Herranz for figuring out the main problem.
1300 - Fix some reference counting errors on host entries that were causing
1303 - Fix a byte-swap bug in the token ring code, thanks to Jochen
1306 - Fix a bug in lease billing, thanks to Jonas Bulow.
1308 Changes since 3.0 Release Candidate 2
1310 - Change the conditions under which a DHCPRELEASE is actually
1311 committed to be consistent with lease binding states rather than
1312 using the lease end time. This may fix some problems with the
1315 - Fix a bug where lease updates would fail on Digital Unix (and maybe
1316 others) because malloc was called with a size of zero.
1318 - Fix a core dump that happens when the DHCP server can't create its
1321 Changes since 3.0 Release Candidate 1 Patchlevel 1
1323 - Fix the dhcp_failover_put_message to not attempt to allocate a
1324 zero-length buffer. Some versions of malloc() fail if you try to
1325 allocate a zero-length buffer, and this was causing problems on,
1328 - Fix a case where the failover code was printing an error message
1329 when no error had occurred.
1331 - Fix a problem where when a server went down and back up again, the
1332 peer would not see a state transition and so would stay in the
1333 non-communicating state.
1335 - Be smart about going into recover_wait.
1337 - Fix a problem in the failover implementation where peers would fail
1338 to come into sync if interrupted in the RECOVER state. This could
1339 have been the cause of some problems people have reported recently.
1341 - Fix a problem with billing classes where they would not be unbilled
1342 when the client lease expired.
1344 - If select fails, figure out which descriptor is bad, and cut it out
1345 of the I/O loop. This prevents a potentially nasty spin. I
1346 haven't heard any report it in a while, but it came up consistently
1349 - Fix a bug in the relay agent where if you specified interfaces on
1350 the command line, it would fail.
1352 - Fix a couple of small bugs in the omapi connection object (no known
1355 - Add the missing 3.0 Beta 1 lease conversion script.
1357 - Read dhcp client script hooks if they exist, rather than only if
1360 Changes since 3.0 Release Candidate 1
1362 - Fix a memory smash that happens when fixed-address leases are used.
1363 ANY SITE AT WHICH FIXED-ADDRESS STATEMENTS ARE BEING USED SHOULD
1364 UPGRADE IMMEDIATELY. This has been a long-standing bug - thanks to
1365 Alvise Nobile for discovering it and helping me to find it!
1367 - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
1370 - There is a known problem with the DHCP server doing failover on
1371 Compaq Alpha systems. This patchlevel is not a release candidate
1372 because of this bug. The bug should be straightforward to fix, so
1373 a new release candidate is expected shortly.
1375 - There is a known problem in the DDNS update code that is probably a
1376 bug, and is not, as far as we know, fixed in this patchlevel.
1378 Changes since 3.0 Beta 2 Patchlevel 24
1380 - Went over problematic failover state transitions and made them all
1381 work, so that failover should now much less fragile.
1383 - Add some dhcpctl and omapi documentation
1385 - Fix compile errors when compiling with unusual predefines.
1387 - Make Token Ring work on Linux 2.4
1389 - Fix the Digital Unix BPF_WORDALIGN bug.
1391 - Fix some dhcp client documentation errors.
1393 - Update some parts of the README file.
1395 - Support GCC on SCO.
1397 Changes since 3.0 Beta 2 Patchlevel 23
1399 - Fix a bug in the DNS update code where a status code was not being
1400 checked. This may have been causing core dumps.
1402 - When parsing the lease file, if a lease declaration includes a
1403 billing class statement, and the lease already has a billing class,
1404 unbill the old class.
1406 - When processing failover transactions, where acks will be deferred,
1407 process the state transition immediately.
1409 - Don't try to use the new SIOCGIFCONF buffer size detection code on
1410 Linux 2.0, which doesn't provide this functionality.
1412 - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
1414 - Fix a problem in using the which command in the configure script.
1416 - Fix a parse error in the client when setting up an omapi listener.
1418 - Document the -n and -g flags to the client.
1420 - Make sure there is always a stdin and stdout on startup. This
1421 prevents shell scripts from accidentally writing error messages into
1422 configuration files that happen to be opened as stderr.
1424 - If an interface is removed, the client will now notice that it is
1425 gone rather than spinning. This has only been tested on NetBSD.
1427 - The client will attempt to get an address even if it can't create a
1430 - Don't overwrite tracefiles.
1432 - Fix some memory allocation bugs in failover.
1434 Changes since 3.0 Beta 2 Patchlevel 22
1436 - Apply some patches suggested by Cyrille Lefevre, who is maintaining
1437 the FreeBSD ISC DHCP Distribution port.
1439 - Fix a core dump in DHCPRELEASE.
1441 Changes since 3.0 Beta 2 Patchlevel 21
1443 - This time for sure: fix the spin described in the changes for pl20.
1445 Changes since 3.0 Beta 2 Patchlevel 20
1447 - Fix a problem with Linux detecting large numbers of interfaces (Ben)
1449 - Fix a memory smash in the quotify code, which was introduced in
1452 - Actually fix the spin described in the changes for pl20. The
1453 previous fix only partially fixed the problem - enough to get it
1454 past the regression test.
1456 Changes since 3.0 Beta 2 Patchlevel 19
1458 - Fix a bug that could cause the server to abort if compiled with
1459 POINTER_DEBUG enabled.
1461 - Fix a bug that could cause the server to spin when responding to a
1464 - Apply Joost Mulders' suggested patches for DLPI on x86.
1466 - Support NUL characters in quoted strings.
1468 - Install unformatted man pages on SunOS.
1470 Changes since 3.0 Beta 2 Patchlevel 18
1472 - Allow the server to be placed in partner-down state using OMAPI.
1475 - Implement omshell, which can be used to do arbitrary things to the
1476 server (in theory). (Damien Neil)
1478 - Fix a case where if a client had two different leases the server could
1479 actually dereference the second one when it hadn't been referenced,
1480 leading to memory corruption and a core dump. (James Brister)
1482 - Fix a case where a client could request the address of another client's
1483 lease, but find_lease wouldn't detect that the other client had it, and
1484 would attempt to allocate it to the client, resulting in a lease conflict
1487 - Fix a case where a client with more than one client identifier could be
1488 given a lease where the hardware address was correct but the client
1489 identifier was not, resulting in a lease conflict message.
1491 - Fix a problem where the server could write out a colon-separated
1492 hex list as a value for a variable, which would then not parse.
1493 The fix is to always write strings as quoted strings, with any
1494 non-printable characters quoted as octal escape sequences. So
1495 a file written the old way still won't work, but new files written
1498 - Fix documentation for sending non-standard options.
1500 - Use unparsable names for unknown options. WARNING: this will
1501 break any configuration files that use the option-nnn convention.
1502 If you want to continue to use this convention for some options,
1503 please be sure to write a definition, like this:
1505 option option-nnn code nnn = string;
1507 You can use a descriptive name instead of option-nnn if you like.
1509 - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
1510 DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
1511 result of a deceptively silly bug in supersede_lease.
1513 - Fix client script exit status check, according to a fix supplied by
1516 - Fix an endianness bug in the tracefile support, regarding ICMP
1519 - Fix a bug in the client where the medium would not work correctly if
1520 it contained quoted strings.
1522 ** there was no pl17 **
1524 Changes since 3.0 Beta 2 Patchlevel 16
1526 - Add support for transaction tracing. This allows the state of the
1527 DHCP server on startup, and all the subsequent transactions, to be
1528 recorded in a file which can then be played back to reproduce the
1529 behaviour of the DHCP server. This can be used to quickly
1530 reproduce bugs that cause core dumps or corruption, and also for
1531 tracking down memory leaks.
1533 - Incorporate some bug fixes provided by Joost Mulders for the DLPI
1534 package which should clear up problems people have been seeing on
1537 - Fix bugs in the handling of options stored as linked lists (agent
1538 options, fqdn options and nwip options) that could cause memory
1539 corruption and core dumps.
1541 - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
1542 not being send in some cases when they were needed.
1544 - Make the lease structure somewhat more compact.
1546 - Make initial failover startup *much* faster. This was researched
1547 and implemented by Damien Neil.
1549 - Add a --version flag to all executables, which prints the program
1550 name and version to standard output.
1552 - Don't rewrite the lease file every thousand leases.
1554 - A bug in nit.c for older SunOS machines was fixed by a patch sent in
1555 by Takeshi Hagiwara.
1557 - Fix a memory corruption bug in the DHCP client.
1559 - Lots of documentation updates.
1561 - Add a feature allowing environment variables to be passed to the
1562 DHCP client script on the DHCP client command line.
1564 - Fix client medium support, which had been broken for some time.
1566 - Fix a bug in the DHCP client initial startup backoff interval, which
1567 would cause two DHCPDISCOVERS to be sent back-to-back on startup.
1570 Changes since 3.0 Beta 2 Patchlevel 15
1572 - Some documentation tweaks.
1574 - Maybe fix a problem in the DLPI code.
1576 - Fix some error code space inconsistencies in ddns update code.
1578 - Support relay agents that intercept unicast DHCP messages to stuff
1579 agent options into them.
1581 - Fix a small memory leak in the relay agent option support code.
1583 - Fix a core dump that would occur if a packet was sent with no
1586 Changes since 3.0 Beta 2 Patchlevel 14
1588 - Finish fixing a long-standing bug in the agent options code. This
1589 was causing core dumps and failing to operate correctly - in
1590 particular, agent option stashing wasn't working. Agent option
1591 stashing should now be working, meaning that agent options can be
1592 used in class statements to control address allocation.
1594 - Fix up documentation.
1596 - Fix a couple of small memory leaks that would have added up
1597 significantly in a high-demand situation.
1599 - Add a log-facility configuration parameter.
1601 - Fix a compile error on some older operating systems.
1603 - Add the ability in the client to execute certain statements before
1604 transmitting packets to the server. Handy for debugging; not much
1605 practical use otherwise.
1607 - Don't send faked-out giaddr when renewing or bound - again, useful
1610 Changes since 3.0 Beta 2 Patchlevel 13
1612 - Fixed a problem where the fqdn decoder would sometimes try to store
1613 an option with an (unsigned) negative length, resulting in a core
1614 dump on some systems.
1616 - Work around the Win98 DHCP client, which NUL-terminates the FQDN
1619 - Work around Win98 and Win2k clients that will claim they want to do
1620 the update even when they don't have any way to do it.
1622 - Fix some log messages that can be printed when failover is operating
1623 that were not printing enough information.
1625 - It was possible for a DHCPDISCOVER to get an allocation even when
1626 the state machine said the server shouldn't be responding.
1628 - Don't load balance DHCPREQUESTs from clients in RENEWING and
1629 REBINDING, since in RENEWING, if we heard it, it's for us, and in
1630 REBINDING, the client wouldn't have got to REBINDING if its primary
1633 - When we get a bogus state lease binding state transition, don't do
1637 Changes since 3.0 Beta 2 Patchlevel 12
1639 - Fixed a couple of silly compile errors.
1641 Changes since 3.0 Beta 2 Patchlevel 11
1643 - Albert Herranz tracked down and fixed a subtle bug in the base64
1644 decoder that would prevent any key with an 'x' in its base64
1645 representation from working correctly.
1647 - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
1648 hang that they both spotted in the DHCP server - when
1649 one-lease-per-client was set, the code to release the "other" lease
1652 - Fix a problem with alignment of the input buffer in bpf in cases
1653 where two packets arrive in the same bpf read.
1655 - Fix a problem where the relay agent would crash if you specified an
1656 interface name on the command line.
1658 - Add the ability to conditionalize client behaviour based on the
1661 - Add support for the FQDN option, and added support for a new way of
1662 doing ddns updates (ddns update style interim) that allows more than
1663 one DHCP server to update the DNS for the same network(s). This
1664 was implemented by Damien Neil with some additional functionality
1667 - Damien added a "log" statement, so that the configuration file can
1668 be made to log debugging information and other information.
1670 - Fixed a bug that caused option buffers not to be terminated with an
1673 - Fixed a long-standing bug in the support for option spaces where the
1674 options are stored as an ordered list rather than in a hash table,
1675 which could theoretically result in memory pool corruption.
1677 - Prevent hardware declarations with no actual hardware address from
1678 being written as something unparsable, and behave correctly in the
1679 face of a null hardware address on input.
1681 - Allow key names to be FQDNs, and qualify the algorithm name if it is
1682 specified unqualified.
1684 - Modify the DDNS update code so that it never prints the "resolver
1685 failed" message, but instead says *why* the resolver failed.
1687 - Officially support the subnet selection option, which now has an
1690 - Fix a build bug on MacOS X.
1692 - Allow administrator to disable ping checking.
1694 - Clean up dhcpd.conf documentation and add more information about how
1697 Changes since 3.0 Beta 2 Patchlevel 10
1699 - Fix a bug introduced during debugging (!) and accidentally committed
1702 Changes since 3.0 Beta 2 Patchlevel 9
1704 - Fix DHCP client handling of vendor encapsulated options.
1706 - Fix a bug in the handling of relay agent information options introduced
1709 - Stash agent options on client leases by default, and use the stashed
1710 options at renewal time.
1712 - Add the ability to test the client's binding state in the client
1713 configuration language.
1715 - Fix a core dump in the DNS update code.
1717 - Fix some expression evaluation bugs that were causing updates to be
1718 done when no client hostname was received.
1720 - Fix expression evaluation debugging printfs.
1722 - Teach pretty_print_option to print options in option spaces other than
1723 the DHCP option space.
1725 - Add a warning message if the RHS of a not is not boolean.
1727 - Never select for more than a day, because some implementations of
1728 select will just fail if the timeout is too long (!).
1730 - Fix a case where a DHCPDISCOVER from an unknown network would be
1733 - Fix a bug where if a client requested an IP address for which a different
1734 client had the lease, the DHCP server would reallocate it anyway.
1736 - Fix the DNS update code so that if the client changes its name, the DNS
1737 will be correctly updated.
1739 Changes since 3.0 Beta 2 Patchlevel 8
1741 - Oops, there was another subtle math error in the header-length
1744 Changes since 3.0 Beta 2 Patchlevel 7
1746 - Oops, forgot to byte-swap udp header length before bounds-checking it.
1748 Changes since 3.0 Beta 2 Patchlevel 6
1750 - Fix a possible DoS attack where a client could cause the checksummer
1751 to dump core. This was a read, not a write, so it shouldn't be
1752 possible to exploit it any further than that.
1754 - Implement client- and server-side support for using the Client FQDN
1757 - Support for other option spaces in the client has been added. This
1758 means that it is now possible to define a vendor option space on the
1759 client, request options in that space from the server (which must
1760 define the same option space), and then use those options in the
1761 client. This also allows NWIP and Client FQDN options to be used
1764 - Add object initializer support. This means that objects can now be
1765 initialized to something other than all-zeros when allocated, which
1766 makes, e.g., the interface object support code a little more robust.
1768 - Fix an off-by-one bug in the host stuffer. This was causing host
1769 deletes not the work, and may also have been causing OMAPI
1770 connections to get dropped. Thanks to James Brister for tracking
1773 - Fixed a core dump in the interface discovery code that is triggered
1774 when there is no subnet declaration for an interface, but the server
1775 decides to continue running. Thanks to Shane Kerr for tracking
1776 down and fixing this problem.
1778 Changes since 3.0 Beta 2 Patchlevel 5
1780 - Fix a bug in the recent enhancement to the interface discovery code
1781 to support arbitrary-length interface lists.
1783 - Support NUL-terminated DHCP options when initializing client-script
1786 - Fix suffix operator.
1788 - Fix NetWare/IP option parsing.
1790 - Better error/status checking in dhcpctl initialization and omapi
1793 - Fix a potential memory smash in dhcpctl code.
1795 - Fix SunOS4 and (maybe) Ultrix builds.
1797 - Fix a bug where a certain sort of incoming packet could cause a core
1798 dump on Solaris (and probably elsewhere).
1800 - Add some more safety checks in error logging code.
1802 - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
1804 - Fix relay agent so that if an interface is specified on the command
1805 line, the relay agent does not dump core.
1807 - Fix class matching so that match if can be combined with match or
1810 - Do not allow spurious leases in the lease database to introduce
1811 potentially bogus leases into the in-memory database.
1813 - Fix a byte-order problem in the client hardware address type code
1816 - Be slightly less picky about what sort of hardware addresses OMAPI
1817 can install in host declarations.
1819 Changes since 3.0 Beta 2 Patchlevel 4
1821 - Incorporated Peter Marschall's proposed change to array/record
1822 parsing, which allows things like the slp-agent option to be encoded
1823 correctly. Thanks very much to Peter for taking the initiative to
1824 do this, and for doing such a careful job of it (e.g., updating the
1827 - Added an encoding for the slp-agent option. :')
1829 - Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
1830 request for help on this with patches!
1832 - Incorporated a change that should fix a problem reported by Philippe
1833 Jumelle where when the network connection between two servers is
1834 lost, they never reconnect.
1836 - Fix client script files other than that for NetBSD to actually use
1837 make_resolv_conf as documented in the manual page.
1839 - Fix a bug in the packet handling code that could result in a core
1842 - Fix a bug in the bootp code where responses on the local net would
1843 be sent to the wrong MAC address. Thanks to Jerry Schave for
1846 Changes since 3.0 Beta 2 Patchlevel 3
1848 - In the DHCP client, execute client statements prior to using the values
1849 of options, so that the client configuration can overried, e.g., the
1852 - Fix a reference counting error that would result in very reproducible
1853 failures in updates, as well as occasional core dumps, if a zone was
1854 declared without a key.
1856 - Fix some Linux 2.0 compilation problems.
1858 - Fix a bug in scope evaluation during execution of "on" statements that
1859 caused values not to be recorded on leases.
1861 - If the dhcp-max-message-size option is specified in scope, and the
1862 client didn't send this option, use the one specified in scope to
1863 determine the maximum size of the response.
1865 Changes since 3.0 Beta 2 Patchlevel 2
1867 - Fix a case where spawning subclasses were being allocated
1868 incorrectly, resulting in a core dump.
1870 - Fix a case where the DHCP server might inappropriately NAK a
1873 - Fix a place dhcprequest() where static leases could leak.
1875 - Include memory.h in omapip_p.h so that we don't get warnings about
1878 Changes since 3.0 Beta 2 Patchlevel 1
1880 - Notice when SIOCFIGCONF returns more data than fit in the buffer -
1881 allocate a larger buffer, and retry. Thanks to Greg Fausak for
1884 - In the server, if no interfaces were configured, report an error and
1887 - Don't ever record a state of 'startup'.
1889 - Don't try to evaluate the local failover binding address if none was
1890 specified. Thanks to Joseph Breu for finding this.