1 Internet Systems Consortium DHCP Distribution
8 Please note that that ISC DHCP is now licensed under the Mozilla Public
9 License, MPL 2.0. Please see https://www.mozilla.org/en-US/MPL/2.0/ to read
10 the MPL 2.0 license terms.
12 NOTE: The client and relay components are now End-Of-Life.
13 4.4.3 is the final release for those components.
15 For information on how to install, configure and run this software, as
16 well as how to find documentation and report bugs, please consult the
19 ISC DHCP uses standard GNU configure for installation. Please review the
20 output of "./configure --help" to see what options are available.
22 The system has only been tested on Linux, and FreeBSD, and may not work on
23 other platforms. Please report any problems and suggested fixes to
26 ISC DHCP is open source software maintained by Internet Systems
27 Consortium. This product includes cryptographic software written
28 by Eric Young (eay@cryptsoft.com).
30 Changes since 4.4.2-P1 (New Features)
32 - BIND libraries updated to the latest version, 9.11.36. This fixes a number
33 of compilation issues on various systems, including OpenWRT. Thanks to
34 Philip Prindeville for testing on OpenWRT.
35 [Gitlab #218, #171, #180, #192]
37 - Added support for the new DHCPv4 option v6-only-preferred specified
38 in RFC 8925. A new reason code, V6ONLY, was added to the client script
39 and the client Linux script sample was updated.
42 Changes since 4.4.2-P1 (Bug Fixes)
44 - Minor corrections to allow compilation under gcc 10.
47 - Corrected logic in dhclient that causes it to decline DHCPv4 leases if the
48 client script exits abnormally (i.e. crashes).
51 - The limit on the size of lease file that can be loaded at start up
52 is now only enforced on 32-bit systems.
55 - The PRNG initialization has been improved. It now uses the configure flag
56 `--with-randomdev=PATH`, which specifies the device from which to read the
57 initial seed. That is typically `/dev/random` (the default value) or
58 `/dev/urandom`, but may be specified otherwise on the local system. If not
59 explicitly specified, the default device (`/dev/random`) is used. The old
60 behavior can be forced by disabling this feature (`--with-randomdev=no`).
61 If the initialization is disabled or reading from the random device fails,
62 the previous algorithm (retrieve the last four bytes of hardware addresses
63 from all network interfaces that have them, and use the current time and
67 - Minor dhclient code fix to remove compilation warnings.
70 - Removed hard-coded MD5 algorithm name in OMAPI connection logic. Prior
71 to this using any other algorithm via key-algorithm statement would
72 allow OMAPI connections to made but subsequent actions such as updating
76 Changes since 4.4.2 (Bug Fixes)
78 - Corrected a buffer overwrite possible when parsing hexadecimal
79 literals with more than 1024 octets.
83 Changes since 4.4.2b1 (Bug Fixes)
85 - Added a clarification on DHCPINFORMs and server authority to
89 - Only emit lease scrubbing log messages when DEBUG_FAILOVER_MESSAGES
93 - Added the interface name to socket initialization failure log messages.
94 Prior to this the log messages stated only the error reason without
95 stating the target interface.
98 - Corrected buffer pointer logic in dhcrelay functions that manipulate
99 agent relay options. Thanks to Thomas Imbert of MSRC Vulnerabilities
100 & Mitigations for reporting the issue.
103 - Corrected unresolved symbol errors building relay_unittests when
104 configured to build using libtool.
107 Changes since 4.4.1 (New Features)
109 - A new configuration parameter, ping-cltt-secs (v4 operation only), has
110 been added to allow the user to specify the number of seconds that must
111 elapse since CLTT before a ping check is conducted. Prior to this, the
112 value was hard coded at 60 seconds. Please see the server man pages for
113 a more detailed discussion.
116 - A new configuration parameter, ping-timeout-ms (v4 operation only),
117 has been added that allows the user to specify the amount of time
118 the server waits for a ping-check response in milliseconds rather
119 than in seconds (via ping-timeout). When greater than zero, the value
120 of ping-timeout-ms will override the value of ping-timeout. Thanks
121 to Jay Doran from Bluecat Networks for suggesting this feature.
124 - An experimental tool called, Keama (KEA Migration Assistant), which helps
125 translate ISC DHCP configurations to Kea configurations, is now included
129 Changes since 4.4.1 (Bug Fixes)
131 - Corrected a misuse of the BIND9 DDNS API which caused DDNS updates to be
132 carried out over TCP rather than UDP. The coding error was exposed by
133 migration to BIND9 9.11. Thanks to Jinmei Tatuya at Infoblox for
137 - Bind9 now defaults to requiring python to build. The Makefile for
138 building Bind9 when bundled with ISC DHCP was modified to turn off
142 - Corrected a dual-stack mixed-mode issue that occurs when both
143 ddns-guard-id-must-match and ddns-other-guard-is-dynamic
144 are enabled and that caused the server to incorrectly interpret
145 the presence of a guard record belonging to another client as
146 a case of no guard record at all. Thanks to Fernando Soto
147 from BlueCat Networks for reporting this issue.
150 - Corrected a compilation issue that occurred when building without DNS
151 update ability (e.g. by undefining NSUPDATE).
154 - Corrected an issue that was causing the server, when running in
155 DHPCv4 mode, to segfault when class lease limits are reached.
156 Thanks to Peter Nagy at Porion-Digital for reporting the matter
157 and submitting a patch.
160 - Made minor changes to eliminate warnings when compiled with GCC 9.
161 Thanks to Brett Neumeier for bringing the matter to our attention.
164 - Fixed potential memory leaks in parser error message generation
165 spotted by Coverity, CIDs: 1448191, 1448193, 1448194, 1448195
168 - Updated URL of IEEE oui.txt in contrib/dhcp-lease-list.pl. Thanks
169 to Tommy Smith for contributing the patch.
172 - Fixed define flags when using SO_BINDTODEVICE. Thanks to Joe LeVeque for
176 - Applied a patch from OpenBSD to always set the scope id of outbound
177 DHPCv6 packets. Note this change only applies when compiling under
178 OpenBSD. Thanks to Brad Smith at OpenBSD from bringing it to our
182 - Modified dhclient to not discard config file leases that are
183 duplicates of server-provided leases and to retain such leases
184 after they have been used as the fallback active lease and
185 DHCP service has been restored. This allows them to be used
186 more than once during the lifetime of a dhclient instance.
187 This applies to DHCPv4 operation only.
190 - Corrected a number of reference counter and zero-length buffer leaks.
191 Thanks to Christopher Ertl of MSRC Vulnerabilities & Mitigations for
195 - Closed a small window of time between the installation of graceful
196 shutdown signal handlers and application context startup, during which
197 the receipt of shutdown signal would cause a REQUIRE() assertion to
198 occur. Note this issue is only visible when compiling with
199 ENABLE_GENTLE_SHUTDOWN defined.
202 - Corrected a buffer overflow that can occur when retrieving zone
203 names that are more than 255 characters in length.
206 - The "d" domain name option format was incorrectly handled as text
207 instead of RFC 1035 wire format. Thanks to Jay Doran at BlueCat Networks
208 for reporting this issue.
211 - Improved the error message issued when a host declaration has both
212 a uid and a dhcp-client-identifier. Server configuration parsing will
213 now fail if a host declaration specifies more than one uid.
216 - Updated developer's documentation on building and running unit tests.
217 Removed support for --with-atf=bind as BIND9 no longer bundles in ATF
221 - Fixed a syntax error in ldap.c which cropped up under Ubuntu
222 18.04.1/gcc 7.4.0. Thanks to Charles Hedrick for pointing it out.
225 - Added clarification to dhcp-options.5 section on ip-address values
226 describing the first-use DNS resolution of options with hostnames as
227 values (e.g. next-server).
230 - The option format for the server option omapi-key was changed to a
231 format type 'k' (key name); while server options ldap-port and
232 ldap-init-retry were changed to 'L' (unsigned 32-bit integer). These
233 three options were inadvertantly broken when the 'd' format content
234 was changed to comply with RFC 1035 wire format (see Gitlab #2).
237 Changes since 4.4.0 (New Features)
239 Changes since 4.4.0 (Bug Fixes)
241 - A delayed-ack value of 0 (the default), now correctly disables the delayed
242 feature. A change in 4.4.0 prohibited lease updates marking leases active
243 from be written to the lease file when delayed-ack is 0. This in turn,
244 caused servers to lose active lease assignments upon restart.
247 ! Option reference count was not correctly decremented in error path
248 when parsing buffer for options. Reported by Felix Wilhelm, Google
253 ! Corrected an issue where large sized 'X/x' format options were causing
254 option handling logic to overwrite memory when expanding them to human
255 readable form. Reported by Felix Wilhelm, Google Security Team.
259 - Added use of new Bind9 compatibility header files, that are now necessary
260 to supply type definitions for primitive data types, removed from Bind9
261 proper. Altered util/bind.sh to pull from Bind9 repo on gitlab.
265 Changes since 4.4.0b1 (New Features)
267 - Duplicate address detection when binding to a new IPv6 address was added
268 to the following dhclient scripts: linux,freebsd,netbsd,openbsd, and macos.
269 The scripts will check for DAD errors after binding to a new IPv6 address
270 for at most --dad-wait-time seconds. If a DAD error is detected the script
271 will exit with a value of 3, instructing dhclient to decline the address. If
272 dad-wait-time is zero (the default), DAD error checking is not peformed.
275 - Support for sending and receiving additional DHCP4 options has been added
276 to both the dhcpd and dhclient. Specifically: option codes 93,94, and 97
277 (RFC 4578); code 150 (RFC 5859); and codes 209,219, and 211 (RFC 5071).
278 Beyond configuring, sending, requesting, and receiving these options neither
279 server nor client apply any additional logic based on their values.
280 Thanks to Peter Lewis for requesting this change.
283 Changes since 4.4.0b1 (Bug Fixes)
285 - Added clarifying text to dhcpd.conf.5 explaining the class match expressions
286 cannot rely on the results of executable statements.
289 - Fixed a bug which causes dhcpd and dhclient to crash on certain
290 systems when given relative path names for lease or pid files on
291 the command line. Affected systems are those on which the C library
292 function, realpath() does not support a second parameter value of
293 NULL (see manpages for realpath(3)).
296 - Fixed a build issue when building with embedded BIND9 under OpenBSD that
297 was causing BIND9 build to not generate dns/enumclass.h and dns/enumtype.h.
300 - Added <dhcp>/m4/README to the distribution tarball. Some versions of
301 ac_local() treat the absence of the m4 subdirectory as error rather than
302 warning. This was causing the call to autoreconf, necessary for building
303 with libtool, to fail.
306 Changes since 4.4.0a1 (New Features)
308 - Added experimental support for relay port (draft-ietf-dhc-relay-port-10.txt)
309 feature for DHCPv4, DHCPv6 and DHCPv4-over-DHCPv6. Relay port has to be
310 enabled at compile time via --enable-relay-port and is fully backward
311 compatible (i.e. works with previous implementations of servers and relays
312 using the standard ports). A new --rp <relay-port> command line option
313 specifies to dhcrelay an alternate source port for upstream (i.e. toward
314 the server) messages. Thanks to Naiming Shen and Enke Chen of Cisco
315 systems for submitting these patches.
318 - Added --release-on-roam to dhcpd server. When enabled and the server detects
319 that a DHCPv6 client (IAID+DUID) has roamed to a new network, it will release
320 the pre-existing leases on the old network and emit a log statement similar
323 "Client: <id> roamed to new network, releasing lease: <address>"
325 The server will carry out all of the same steps that would normally occur
326 when a client explicitly releases a lease. This behavior is disabled by
327 default and may only be specified globally. Prior to this the server renders
328 the leases unavailable until they expire or the server is restarted. Clients
329 that need leases in multiple networks must supply a unique IAID in each IA.
330 When release-on-roam is disabled (the default) the server maintains the
331 prior behavior of making such leases unavailable until they expire or the
332 server is restarted. Clients that need leases in multiple networks must
333 supply a unique IAID in each IA. This parameter may only be specified at
334 the global level. Thanks to Fernando Soto from BlueCat Networks for
335 suggesting this change.
339 - Support for delayed-ack is now compiled in by default. Prior to this
340 it had to be enabled at compile time via --enable-delayed-acks. The
341 default value for delayed-ack, however, has been changed from 28 to 0
342 (i.e. disabled). This was done to minimize the impact on users not
343 currently using the feature. Please note that the delayed-ack feature
344 is not currently compatible with support for DHPCv4-over-DHCPv6 so
345 when a 4to6 port command line argument enables this in the server the
346 delayed-ack value is reset to 0.
349 - The server (-6) now honors the parameter, update-static-leases, for static
350 (fixed-address6) DHCPv6 leases. It is worth noting that because stateful
351 data is not retained by the server for static leases, each time a client
352 requests or renews a static lease, the server will perform DDNS updates for
353 it. This may have significant performance implications for environments
354 with many clients that request or renew static leases often. Similarly,
355 the DNS entries will not be removed by server when a client issues a RELEASE
356 nor if the lease is deleted from the configuration. In such cases the DNS
357 entries must be removed manually. This feature is disabled by default.
358 Thanks to both Bill Shirley and dgutier-at-cern-dot-ch for requesting
364 - Added to the server (-6) a new statement, local-address6, which specifies
365 the source address of packets sent by the server. An additional flag,
366 bind-local-address6, disabled by default, binds the service socket to
367 to local-address6. Note that bind-local-address does not work with direct
368 clients: a relay has to forward packets to the server using the
369 local-address6 destination.
372 Changes since 4.4.0a1 (Bugs)
374 - The server now recognizes environment variables PATH_DHCPD_DB and
375 PATH_DHCPD_PID. These had been incorrectly compiled out of the code
376 unless DHCPv6 support was disabled. Additionally, the server man
377 pages were corrected to accurately reflect how the server chooses
378 file names (see lease-file-name and pid-file-name statements). Thanks
379 to Fernando Soto at Bluecat Networks for bringing this matter to our
383 - Removed an "Impossible condition" error upon exit in the dhcpd server that
384 has been shutdown via OMAPI. This condition was only apparent under Solaris
385 when building with --enable-use-sockets and --enable-ipv4-pktinfo.
388 - Corrected some minor Coverity issues: CID 1426059, 1426058, and 1426057.
391 - Added missing text to dhclient.8 and expanded release note coverage
392 for --address-prefix-len changes.
394 Changes since 4.3.6 (New Features)
396 - Added --enable-bind-install to install embedded bind includes and
397 libraries. Default is to not install them (it was the previous
398 behavior). If you'd like to change the includedir and/or libdir
399 installation directories to something different than for ISC DHCP
400 you must pass them using the --with-bind-extra-config configuration
404 - Added support of dynamic shared libraries with libtool. A new
405 --enable-libtool configuration parameter is available but
406 should not be used directly: *please* read the build configuration
407 section in the README file for the recommended procedure.
410 - IPv6 operation now supports an EUI-64 based address allocation which will
411 calculate addresses for clients with EUI-64 DUIDs based on those DUIDs when
412 enabled by setting use-eui-64 true. The parameter may defined down to the
413 pool scope. Note this feature must be compiled in by defining EUI_64 in
414 includes/site.h. This flag is undefined by default.
417 - The directory includes/isc-dhcp and it's only occupant, dst.h, have
418 been removed from the source tree. They are obsolete for branches
422 - Replaced ISC licensing with Mozilla Public License, MPL 2.0 licensing
423 throughout. Please see https://www.mozilla.org/en-US/MPL/2.0/ to read
424 the MPL 2.0 license terms.
427 - Load balancing for failover peers can now be disabled by setting
428 "load balance max secs" to 0. Doing so for both peers means both
429 servers will respond to all DHCPDISCOVERs or DHCPREQUESTs as soon as
433 - Added a new dhclient command line parameter, --prefix-len-hint <length>.
434 When used in conjunction with -P, it directs dhclient to use the given
435 length as the prefix length hint when requesting prefixes. Thanks to both
436 Indy, of the FireballISO open source project and H. Peter Anvin for
437 suggesting this change.
443 - dhclient will now wait for 10 seconds after declining an IPv4 address
444 before issuing a discover. This is in keeping with RFC 2131, section 3.1.5.
445 Prior to this dhclient did not wait at all. The amount of time dhclient
446 waits can be specified via a new command line parameter:
447 --decline-wait-time <seconds>. A value of zero equates to no wait at all.
448 Thanks to Pavel Kankovsky for bringing this matter to our attention.
449 **NOTE: THIS IS CHANGE IN DEFAULT BEHAVIOR.
452 - dhclient will now include the lease address when logging DHCPOFFERs,
453 DHCPREQUESTs, DHCPACKs, DHCPRELEASEs, and DHCPDECLINEs. Additionally,
454 DHCPOFFERs will be logged before their corresponding DHCPREQUESTs are
458 - When given the -T command line argument, in addition to reading the
459 current lease file, the server will write the leases to a temporary
460 lease file. This can help detect issues in server configuration that
461 only surface when leases are written to the file. The current lease
462 file will not be modified and the temporary lease file is removed upon
463 completion of the test.
466 - dhclient will now generate a DHCPv6 DECLINE message containing all IA_NA
467 addresses which for which the client script indicates a DAD failure. After
468 receiving the DECLINE reply, dhclient will restart the solicit process.
469 Note, the client script must exit with a value of 3 to signify that the
470 address failed DAD. Thanks to Jiri Popelka of Red Hat for submitting the
471 patch that was the foundation for this change.
472 **NOTE: THIS IS CHANGE IN DEFAULT BEHAVIOR.
477 - Replaced compilation option, enable-secs-byteorder, with a run-time, server
478 configuration parameter, check-secs-byte-order. When enabled, the
479 server will check for clients that do the byte ordering on the secs field
480 incorrectly. This field should be in network byte order but some clients
481 get it wrong. When this parameter is enabled the server will examine the
482 secs field and if it looks wrong (high byte non zero and low byte zero) swap
483 the bytes. The default is disabled. This parameter is only useful when
484 doing load balancing within failover.
487 - The default value for server (-6) parameter, prefix-length-mode, has been
488 changed from "exact" to "prefer". In "prefer" mode the server will offer
489 the first available prefix with the same length as that requested by the
490 client. If none are found then it will offer the first available prefix of
491 any length. This is more in line with with RFC 8168 and should improve
492 the out-of-the-box user experience.
493 **NOTE: THIS IS CHANGE IN DEFAULT BEHAVIOR.
496 - Added support for 'dhcp-cache-threshold' to IPv6 operation: If a client
497 renews before 'dhcp-cache-threshold' percent of its lease has elapsed
498 (default 25%), the server will reuse the allocated lease (provide a
499 lease within the currently allocated lease-time) rather than extend or
500 renew the lease. This allows the server to reply without needlessly
501 writing leases to disk. The preferred and valid lease lifetimes
502 sent to the client will be reduced by the age of the lease. The option
503 may be specified down to the pool level and is supported for all three
504 pool types: NA, TA, and PD.
507 - Added three new server configuration parameters which influence DDNS:
508 1. ddns-dual-stack-mixed-mode - alters DNS conflict resolution behavior
509 to mitigate issues with non-compliant clients in dual stack environments.
511 2. ddns-guard-id-must-match - relaxes the DHCID RR client id matching
512 requirement of DNS conflict resolution.
514 3. ddns-other-guard-is-dynamic - alters dual-stack-mixed-mode behavior to
515 allow unguarded DNS entries to be overwritten in certain cases
520 - A "key-algorithm <algorithm>" statement has been added to omshell to
521 allow the specification of the key algorithm to use during transaction
522 authentication. Prior to this it was hard-coded to be hmac-md5. It now
523 supports all of the same algorithms as the dhcpd server: hmac-md5 (the
524 default), hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384, and hmac-sha512.
527 - Added a server configuration parameter, persist-eui-64-leases, which
528 determines whether or not EUI-64 based leases are written to the
529 leases file. Default is true.
532 - Changed the default value of the prefix length passed by dhclient into the
533 client script for each IPv6 address from 64 to 128. This was done to comply
534 with RFC3315bis draft (-09, page 64) and RFC5942, Section 4, point 1.
535 In addition, dhclient now supports a command line argument,
536 --address-prefix-len, which may be used to override the default value.
537 **WARNING**: This change may not be backwardly compatible with your
538 environment. If you are operating without a router, such as between VMs on
539 a host, you may find they cannot see each with prefix length of 128. In
540 such cases, you'll need to either provide routing or use the command line
541 parameter to set the value to 64. Alternatively you may change the default
542 at compile time by setting DHCLIENT_DEFAULT_PREFIX_LEN in includes/site.h.
546 - Modified dhclient (-6) to bypass sending a confirm (INIT REBOOT) when it has
547 only expired address associations. Thanks to Jiri Popelka at Red Hat for
548 raising the issue and submitting the patch.
550 Changes since 4.3.6 (Bugs):
552 - Corrected an issue where the server would return a client's previously
553 released prefix lease even when the client provides a prefix length
554 hint that does not match the prior lease. Now the server will only
555 return the previous lease if it exactly matches the hint. If not
556 it will attempt to allocate a new prefix based on the hint and the
557 prefix-length-mode. Thanks to Tim DeNike - Lightspeed Communications
558 for pointing out the error of our ways.
561 - Added explicit include of BIND9 isc/util.h to adapt to revisions
562 in BIND9 (see BIND9 ticket #46311). Prior to this the build was failing
563 with implicit function declarations errors for POST() and INSIST().
566 - Added to code ignore empty IPv4 host name option (code 12). While RFC 2132
567 states the option cannot be empty, some clients are apparently capable of
568 sending it. Prior to this the server was attempting to use it and store it
569 in the lease file causing issues with DDNS and so forth.
572 - Corrected dhclient command line parsing for --dad-wait-time that causes
573 even valid values to fail as invalid on some environments.
576 - Replaced iasubopt::heap_index with separate values for active and inactive
577 heaps: iasubopt::active_index and iasubopt::inactive_index. This was done
578 to accommodate a change in behavior in BIND9 isc_heap_delete().
581 ! Plugged a socket descriptor leak in OMAPI, that can occur when there is
582 data pending to be written to an OMAPI connection, when the connection
583 is closed by the reader. Thanks to Pavel Zhukov at RedHat for bringing
584 this issue to our attention and whose patch helped guide us in the right
588 - The ability of the server to send back dhcp6.vendor-opts values has been
589 restored. A change in 4.3.5 (see #29246) which enabled it to send back the
590 FQDN option unfortunately broke its ability send back dhcp6.vendor-opts.
591 Thanks to Sumant Gupta (sumantgupta at gmail dot com) of Landis+Gry for
592 bringing this issue to our attention.
595 Changes since 4.3.6b1
601 - The server now allows the client identifier (option 61) to own leases
602 in more than one subnet concurrently. Prior to this the server would
603 incorrectly release an existing lease in one subnet prior to assigning
604 a lease in another subnet. Note that the prior behavior can be still
605 be achieved by enabling one-lease-per-client. Thanks to both David Zych at
606 the University of Illinois and Norm Proffitt of Infoblox for reporting
607 the issue; and Norm for suggesting a solution.
610 - When replying to a DHCPINFORM, the server will now include options specified
611 at the pool scope, provided the ciaddr field of the DHCPINFORM is populated.
612 Prior to this the server only evaluated options down to the subnet scope.
613 Thanks to Fernando Soto at BlueCat Networks for reporting the issue.
617 - When memory allocation fails in a repeated way the process writes
618 "Run out of memory." on the standard error and exists with status 1.
621 - The new lmdb (Lightning Memory DataBase) bind9 configure option is
622 now disabled by default to avoid the presence of this library to be
623 detected which can lead to a link failure.
626 - The linux interface discovery code has been modified to use getifaddrs()
627 as is done for BSD and OS-X. Prior to this the code would only recognize
628 the first address on an interface and thereby omit vlans.
629 Thanks to Jiri Popelka at Redhat, Marius Tomaschewski at SUSE, and Wei
630 Kong at Novell, who all submitted patches.
637 - Fixed a bug in OMAPI that causes omshell to crash when a name-value
638 pair with a zero length value is shipped in an object. Thanks to
639 Fernando Soto at BlueCat Networks for reporting the issue and
643 - On 64-bit platforms, dhclient now generates the correct value for the
644 script environment variable, "expiry", the lease expiry value exceeds
645 0x7FFFFFFF. Prior to this such values would produce negative values
646 for expiry in the script environment.
649 - Common timer logic was modified to cap the maximum timeout values at
650 0x7FFFFFFF - 1. Values larger than that were causing fatal timer out of
651 range errors on 64-bit platforms. Thanks to Jiri Popelka at Red Hat for
655 - DHCP6 FQDN option unpacking code now correctly handles values that contain
656 spaces, special, or non-printable characters. Prior to this the buffer
657 size needed was underestimated causing a conversion error message to
658 be logged and DNS updates to be skipped. Thanks to Fernando Soto at
659 BlueCat Networks for bringing the matter to our attention.
662 - When running in -6 mode, dhclient can enforce the require option statement
663 and will discard offered leases that do not contain all the required
664 options specified in the client configuration. If not enabled the client
665 will still consider such leases. This must be enabled at compile time
666 (see ENFORCE_DHCPV6_CLIENT_REQUIRE in includes/site.h). Thanks to
667 Mritunjaykumar Dubey at Nokia for reporting the issue.
670 - Altered DHCPv4 lease time calculation to avoid roll over errors on 64-bit
671 OS systems when using -1 or large values for default-lease-time. Rollover
672 values will be replaced with 0x7FFFFFFF - 1. This alleviates unintentionally
673 short expiration times being handed out when infinite lease times (-1) in
674 conjunction with failover. Our thanks to Alessandro Gherardi for bringing
675 the issue to our attention.
678 - Added new compile time option --with-srv-conf-file which specifies a
679 default location of the server configuration file.
682 - Added --dad-wait-time parameter to dhclient. It specifies the maximum time,
683 in seconds, that the client process should wait for the duplicate address
684 detection to complete before initiating DHCP requests. This value is
685 propagated to the dhclient script and the script is responsible for waiting
686 the specified amount of time or until DAD has completed. If the script does
687 not support it, specifying this parameter has no effect. The default value
688 is 0 which specifies that the script should not wait for DAD. With this
689 change the following scripts have been modified to support the new parameter:
690 freebsd, linux, macos, netbsd, openbsd.
693 - The server nows checks both the address and length of a prefix delegation
694 when attempting to match it to a prefix pool. This ensures the server
695 responds properly when pool configurations change such that once valid,
696 "in-pool" delegations are now treated as being invalid. During lease
697 file loading at startup, the server will discard any PD leases that
698 are deemed "out-of-pool" either by address or mis-matched prefix length.
699 Clients seeking to renew or rebind such leases will get a response of
700 No Binding in the case of the former, and the prefix delegation with
701 lifetimes set to zero in the case of the latter. Thanks to Mark Nejedlo
702 at TDS Telecom for reporting this issue.
705 - Modified DDNS support initialization such that DNS related ports will only be
706 opened by the server (dhcpd) at startup if ddns-update-style is not "none";
707 by dhclient only if and when the it first attempts an update; and never by
708 dhcrelay. Prior to this all three always did the initialization at startup
709 which causes them to always open on and listen for traffic on two random
710 ports. Thanks to Rodney Beede for reporting this issue.
714 - Added error logging to two memory allocation failure checks. Thanks to Bill
715 Parker (wp02855 at gmail dot com) for reporting the issue.
718 - Corrected a dhclient -6 issue that caused the client to crash with an
719 "Impossible condition" error after de-preferencing its only IA binding.
720 The crash occurred when server configuration changes rendered the existing
721 binding out-of-range and no other leases were available to offer. Thanks
722 to Pierre Clerissi for bringing this issue to our attention.
725 - By defining CALL_SCRIPT_ON_ONETRY_FAIL in includes/site.h, dhclient will
726 now call the script with reason set to FAIL when run with -1 (one try) and
727 there are no server responses. This applies to IPv4 mode only. Thanks for a
728 patch by Martin Pitt which got to us via Andrew Pollock.
731 - The server now detects failover peers that are not referenced in at least
732 one pool when run with the command line option for test mode, -T. Prior to
733 this the check was performed too far down stream to be detected in test mode.
736 - Linux script updated. The script is now based on Debian version. It uses
737 ip tool from iproute2 package and ifconfig is no longer used. This also
738 addresses an issue of calling arping with inappropriate parameter.
742 - Changed severity of the log message indicating UDP checksum errors in
743 the received packets from 'info' to 'debug' to avoid logging excessive
744 number of false positives when UDP checksum offloading is enabled.
747 - The directory minires has been removed from the source tree. It has
748 long been obsolete for branches other than v4_1_esv. Additionally,
749 includes/minires.h was renamed includes/ns_name.h.
752 - Replaced ifconfig parameters "add" and "delete" with "alias" and "-alias"
753 for IPv6 mode in the client scripts, netbsd and openbsd. This was
754 preventing IPv6 addresses from being added or removed from interfaces.
755 Thanks to Tim Dean for reporting this issue.
758 Changes since 4.3.5b1
760 - Corrected a bug which could cause the server to sporadically crash while
761 loading lease files with the lease-id-format is set to "hex". Our thanks
762 to Jay Ford, University of Iowa for reporting the issue.
765 - Eliminated a noisy, but otherwise harmless debug log statment that may
766 appear during server startup when building with --enable-binary-leases
767 and configuring multiple pools in a shared network. Thanks to Fernando
768 Soto from BlueCat Networks for reporting the issue and supplying a patch.
773 - Fixed util/bindvar.sh error handling.
776 - Correct error message in relay to use remote id length instead
777 of circuit id length.
780 - Add logic to test directory Makefiles to avoid copying Attfile(s)
781 when building within the source tree. This eliminates a noisy but
782 otherwise harmless error message when running "make check".
785 - Leases are now scrubbed of certain prior use information when pool
786 re-balancing reassigns them from one FO peer to the other. This
787 corrects an issue where leases that were offered but not used
788 by the client retained the client hostname from the original
789 client. Thanks to Pavel Polacek, Jan Evangelista Purkyne University
790 for reporting the issue.
793 - In the LDAP code and schema add some missing '6' characters to use
794 the v6 instead of the v4 versions. Thanks to Denis Taranushin for
795 reporting this issue and supplying its patch.
798 - Correct how the pick-first-value expression is written to a lease
799 file. Previously it was written as a concat expression due to
800 a cut and paste error.
803 - Modify the DDNS code to clean up the PTR record even if there
804 are issues while cleaning up the A or AAAA records.
807 - Added global configuration parameter, abandon-lease-time, which determines
808 the amount of time a lease remains abandoned. The default is 84600 seconds.
809 Additionaly, the server now conducts a ping check (if ping checks are
810 enabled) prior to offering an abandoned lease to client. Our thanks to
811 David Zych at University of Illinois for reporting the issue and working
812 with us to produce a viable solution.
815 - Correct handling of interface names during interface discovery. This
816 addresses an issue where interface names of 15 characters in length
817 could lead to crashes or interface recognition errors during startup
818 of dhcpd, dhclient, and dhcrelay.
821 - Updates to contrib/dhcp-lease-list.pl to make it more friendly.
822 The updates are: looking for the lease file in more places and skipping
823 the "processing complete" output when creating machine readable
824 output. Thanks to Cameron Paine (cbp at null dot net) for the
828 - When reusing a lease for dhcp-cache-threshold return the hostname
829 to the original lease. Also if the host pointer, UID or hardware address
830 change don't allow reuse of the lease.
831 Thanks to Michael Vincent for reporting this and helping us
832 verify the problem and fix.
835 - Change dmalloc to use a size_t as the length argument to bring it
836 in line with the call it will make to malloc().
839 - If the failover socket can't be bound, close it. Otherwise if the
840 user configures an incorrect address in the failover stanza the
841 server will continue to open new sockets every 90 seconds until
845 - Add DHCPv4-mode, dhcrelay command line options, "-iu" and "-id", that
846 allow interfaces to be upstream or downstream respectively. Upstream
847 interfaces will accept and forward only BOOTP replies, while downstream
848 interfaces will accept and forward only BOOTP requests.
851 - Clean up some memory references in the vendor-class construct.
854 Changes since 4.3.4b1
860 - Corrected a static analyzer warning in common/execute.c
863 - ISC DHCP now follows the common convention to use the base name a
864 program is invoked with (aka argv[0], vs. a builtin name) for
865 logs. This should help differentiate syslog entries for DHCPv4 and
866 DHCPv6 servers. You can define OLD_LOG_NAME in includes/site.h to
867 keep the previous behavior.
870 - The Linux packet filter code now correctly treats only the least significant
871 12 bits in an inbound packet's TCI value as the VLAN id (per IEEE 802.1Q).
872 Prior to this it was using the entire 16 bit value as the VLAN id and
873 incorrectly discarding packets. Thanks to Jiri Popelka at Red Hat for
874 reporting this issue and supplying its patch.
877 - Fixed several static analysis issues such as potential null
878 references, unchecked strdup returns. Thanks to Bill Parker (wp02855 at
879 gmail dot com) who identified these issues and supplied patches to
884 - Corrected compilation errors that prohibited building the server
885 and its ATF unit tests when failover is disabled.
888 - Added the lease address to the end of the debug level log message
889 emitted when an existing lease is renewed within the dhcp-cache-threshold.
890 Thanks to Nathan Neulinger at Missouri S&T for suggesting the change.
893 - Added dhcpv6 and delayed-ack to settings listed in the "Features:"
894 section of the configure script output. Additionally, all of the
895 features reported on will now always show either a "yes" or "no"
896 value. Prior to this features left to their default setting would
900 - Added a parameter, authoring-byte-order, to the lease file. This value
901 is automatically added to the top of new lease files by the server and
902 indicates the internal byte order (big endian or little endian) of the
903 server. This permits lease files generated on a server with one form of
904 byte order to be used on a server with the opposite form. Our thanks to
905 Timothe Litt for calling this to our attention and for the suggestions
909 - Fixed a small memory leak in the DHCPv6 version of the client code.
910 This is unlikely to cause significant issues in actual use.
913 - Corrected a few minor memory leaks in omapi's dereferencing of
914 host objects. Thanks to Jiri Popelka at Red Hat for reporting
915 the issue and supplying the patches.
919 - Cleaned up some of the Make infrastructure to make --with-libbind
920 work better. Though it still only works with an absolute path.
923 - Made the embedded bind libraries able to be cross compiled
924 (please refer to the bind9 documentation to learn how to cross
925 compile DHCP and its bind library dependency).
928 - Update the client code to better support getting IA_NAs and IA_PDs
929 in the same packet, see RFC7550 for some discussion.
932 ! Update the bounds checking when receiving a packet.
933 Thanks to Sebastian Poehn from Sophos for the bug report and a suggested
938 - When handling an incorrect command line for dhcpd, dhclient or dhcrelay
939 print out a specific error message about the first error in addition
940 to the usage string. This may be disabled by editing includes/site.h.
944 - The configure script will now exit with an error message if it cannot find
945 a GNU-style make tool (needed when building BIND libraries) or pkg-config
946 (needed to locate ATF used for building unit tests). Prior to this the
947 script would exit indicating success causing subsequent attempts to build
948 the software to fail.
951 - Properly terminate strings before passing them to regex and fix
952 a boundary error when creating certain new data strings.
953 Thanks to Andrey Jr. Melnikov for the bug report.
956 - Option expressions, such as prepend and append, are now supported when
957 running dhclient for IPv6. Prior to this such statements in the
958 client configuration file would be parsed but have no affect. Thanks
959 to Jiri Popelka at Red Hat for reporting the issue.
962 - A failover primary server will now accept a binding status update from the
963 secondary which transitions a lease from ACTIVE to ABANDONED. This accounts
964 for instances in which a client declines a lease and only the secondary
965 server receives it. Prior to this the primary server would reject such an
966 update as an "invalid state transition".
969 - Properly allocate memory for a bpf filter.
970 Thanks to Bill Parker (wp02855 at gmail dot com) who identified this issue.
973 - Updated contrib/dhcp-lease-list.pl to handle garbage in the oui file better
974 and to print out the hostnames a bit better.
975 Thanks to Antoine Beaupré from Debian for the suggested patch.
978 - The DHCPv6 server now handles long valid and preferred lease times better.
979 Values that would cause the internal end time of the lease to wrap are
980 modified to work as infinite.
983 - Updated support for cross compiling by allowing the library archiver
984 to be set at configure time via the environment variable 'AR'.
987 - The server will now match DHCPv6 relayed clients to host declarations
988 which include the "hardware" statement, if the relay connected to the
989 client supplies the client's hardware address via client-linklayer-address
990 option as per RFC 6939.
993 - Allow a filename to be specified instead of /dev/random during
994 configuration. This is passed to the BIND configuration to allow
995 for cross compilation.
998 - Add more option definitions.
1001 - Correct outputting of long lines in the lease file when writing
1002 a lease that includes long strings in an execute statement.
1005 - The server will now correctly treat a lease as reserved when the client
1006 requests an infinite lease time (i.e. OxFFFFFFFF) and "infinite-is-reserved"
1007 is enabled. Prior to this the server would halt. In addition, corrections
1008 were made to the server to allow a lease's flags field to be set via omapi.
1009 Prior to this, the server, depending on the host architecture, would
1010 incorrectly parse the new flags value from the omapi message.
1013 - ISC DHCP can now be configured and built from a directory other than
1014 the top level source directory. Note that "make distcheck" uses this
1018 - Add support for RFC 3527 to dhcrelay. A new, dhcrelay command line argument,
1019 "-U <interface>" enables the addition of a RFC 3527 compliant link selection
1020 suboption to the agent option added for clients directly connected to the
1025 - Add a new global DHCPv6 option, dhcpv6-set-tee-times, which when enabled
1026 instructs the server to calculate T1 and T2 as recommended in RFC 3315,
1030 - Corrected minor Coverity issues.
1033 - Add support for RFC 7341 DHCPv4 over DHCPv6 with a new configuration
1034 option "--enable-dhcpv4o6". Note this feature requires DHCPv6 support
1035 and is not compatible with delayed-ack. Both client and server use 2
1036 processes which communicate over UDP on a pair of sockets. The new
1037 "-4o6 <port>" command line argument enables DHCPv4 over DHCPv6 support
1038 and specifies the consecutive ports to use for inter-process communication.
1039 Please look at doc/DHCPv4-over-DHCPv6 for more details.
1042 - Correct interface name formation when using DLPI under Solaris 11. As of
1043 Solaris 11, ethernet device files are located in "/dev/net". The configure
1044 script has been modified to detect this situation and adjust the directory
1045 used accordingly. Thanks to Jarkko Torppa for reporting this issue and
1050 - Add a dereference call when handling an error condition while
1054 - Add a new parameter, lease-id-format, to both dhcpd and dhclient. The
1055 parameter controls the format in which certain values are written to lease
1056 files. Formats supported are octal - quoted string containing octal
1057 escapes, and hex - unquoted, colon separated hex digits. Thanks to
1058 Jay Ford, University of Iowa for bringing the issue to our attention.
1061 ! Add an option in site.h to limit the number of failover and control
1062 connections the server will accept. By default this is 200.
1066 Changes since 4.3.3b1
1072 - The server now does a better check to see if it can allocate the memory
1073 for large blocks of v4 leases and should provide a slightly better error
1074 message. Note well: the server pre-allocates v4 addresses, if you use
1075 a large range, such as a /8, the server will attempt to use a large
1076 amount of memory and may not start if there either isn't enough memory
1077 or the size exceeds what the code supports.
1080 - The server will now reject unicast Request, Renew, Decline, and Release
1081 messages from a client unless the server would have sent that client the
1082 dhcp6.unicast option. This behavior is in compliance with paragraph 1 in
1083 each of the sections 18.2,1, 18.2.3, 18.2.6, and 18.2.7 of RFC 3315. Prior
1084 to this, the server would simply accept the messages. Now, in order for
1085 the server to accept such a message, the server configuration must include
1086 the dhcp6.unicast option either globally or within the shared network to
1087 which the requested lease belongs. In other words, the server will map
1088 the first IA_XX address found within the client message to a shared-network
1089 and look for the presence of the unicast option there and then globally.
1090 Thanks to Jiri Popelka at Red Hat for this issue and his patch which
1094 - The ATF (Automated Testing Framework) tools used for optional unit tests
1095 can now be built from its embedded sources in bind, solving the
1096 atf-run / atf-report issue with recent (>= 0.20) versions of ATF.
1097 The new configuration option is "./configure --with-atf=bind".
1098 [ISC-Bugs #38754, #39300]
1100 - Corrected a compilation error introduced by the fix for ISC-Bugs #22806.
1101 On older linuxes that do not include the tpacket_auxdata structure don't
1102 bother allocating the cmsgbuf as it isn't necessary and we don't have
1103 a proper length for it.
1106 - Remove the dst directory. This was replaced in 4.2.0 with the dst
1107 code from the Bind libraries but we continued to include it for
1108 backwards compatibility. As we have now released 4.3.x it seems
1109 reasonable to remove it.
1112 - Write out the DUID server id on startup in all cases, previously if it
1113 was read in from server-duid option in the config or lease files for
1114 DHCPv4 it would not be written to the new lease file.
1117 - When parsing dates for leases convert dates past 2038 to "never".
1118 This avoids problems with integer overflows in the date and time
1119 handling code for people that decide to use very large lease times
1120 or add a lease entry with a date far in the future.
1123 - Leave the siaddr field clear when sending a NACK as per RFC 2131
1127 - In the client don't send expired addresses to the script as part of
1128 the binding process. Thanks to Sven Trenkel at Google for reporting
1129 the issue and suggesting the patch.
1132 - While parsing IPv6 addresses treat "add" as part of the address instead
1136 - Add support for accessing the v4 lease queues (active, free etc) in a
1137 binary fashion instead of needing to walk through a linear list to
1138 insert, find or remove an entry from the queues. In addition add a
1139 compile time option "--enable-binary-leases" to enable the new code
1140 or to continue using the old code. The old code is the default.
1141 Thanks to Fernando Soto from BlueCat Networks for the patch.
1144 - Delayed-ack now works properly with Failover. Prior to this, bind updates
1145 post startup were being queued but never delivered. Among other things, this
1146 was causing leases to not transition from expired or released to free.
1149 - Clean up parsing of v6 lease files a bit to avoid infinite loops if the
1150 lease file is corrupt in certain ways.
1153 - Corrected a crash in dhclient that occurs during lease renewal if the
1154 client is performing its own DNS updates. Thanks to Jiri Popelka at Red Hat
1158 - Corrected an issue in v6 lease file parsing. Prior to this, when encountering
1159 a lease with an address for which no configured pool exists, the server was
1160 declaring the lease file corrupt and incorrectly skipping over the subsequent
1161 entry in the file. The server will now emit a log message indicating that
1162 no pool was found for the address (or prefix) and correctly resume parsing
1163 with the next entry in the lease file. Our thanks to Michal Žejdl for
1164 reporting the issue.
1167 - Be more liberal in finding a subnet group associated with a static
1168 prefix. When we added the class matching code for v6 we also added
1169 a requirement that the static prefix must be within a subnet the
1170 client was in, in order to find the proper statements. We now
1171 look for a subnet based on the prefix, failing that on the static
1172 address for the client and failing that on the shared network
1176 - Add a new action expression "parse_vendor_options", which can be used
1177 to parse a vendor-encapsualted-option received by the server based on
1178 the encoding specified by the vendor-option-space statement.
1181 - Enhance the PARANOIA patch to include fchown() the lease file to
1182 allow it to be manipulated after the server does a chown().
1183 Thanks to Jiri Popelka at Red Hat for the patch.
1186 - Relax the requirement that prefix pools must be within the subnet.
1187 This was added in as part of #32453 in order to avoid configuration
1188 mistakes but is being removed as prefixes aren't required to be
1189 within the same subnet and many people configure them in that fashion.
1192 - Fixed a server crash that could occur when the server attempts to remove
1193 the billing class from the last lease billed to a dynamic class after said
1194 class has been deleted. Our thanks to Lasse Pesonen for reporting the
1198 - LDAP Patches - Numerous small patches submitted by contributors have
1199 been applied to the contributed code which supplies LDAP support.
1200 In addition, two larger submissions have also been included. The
1201 first adds support for IPv6 configuration and the second provides
1202 GSSAPI authentication. We would like to thank the following for their
1203 contributions (alphabetically):
1205 Bill Parker (wp02855 at gmail dot com)
1206 Jiri Popelka at Red Hat
1207 Marius Tomaschewski at SUSE
1208 (william at adelaide.edu.au), The University of Adelaide
1224 - Handle an out of memory condition in the client a bit better.
1225 Thanks to Frédéric Perrin from Brocade for finding the issue
1226 and suggesting a patch.
1229 Changes since 4.3.2rc2
1232 Changes since 4.3.2rc1
1234 - Corrected a compilation error introduced by the fix for ISC-Bugs #37415.
1235 The error occurs on Linux variants that do not support VLAN tag information
1236 in packet auxiliary data. The configure script now only enables inclusion
1237 of the VLAN tag-based logic if it is supported by the underlying OS.
1240 Changes since 4.3.2b1
1242 - Specifying the option, --disable-debug, on the configure script command line
1243 now disables debug features. Prior to this, specifying --disable-debug
1244 incorrectly enabled debug features. Thanks to Gustavo Zacarias for reporting
1248 - Unit test execution now uses a path augmented during configuration
1249 processing of the --with-atf option to locate ATF runtime tools, atf-run
1250 and atf-report. For most installations of ATF, this should alleviate the
1251 need to manually include them in the PATH, as was formerly required.
1252 If the configure script cannot locate the tools it will emit a warning,
1253 informing the user that the tools must be in the PATH when running unit
1255 Secondly, please note that "make check" will now exit with a failure status
1256 code (non-zero) if one or more unit tests fail. This means that invoking
1257 "make check" from an upper level directory will cause the make process to
1258 STOP after the first test subdirectory with failed test(s). To force all
1259 tests in all subdirectories to run, regardless of individual test outcome,
1260 use the command "make -k check".
1265 - Corrected parser's right brace matching when a statement contains an error.
1268 - TSIG-authenticated dynamic DNS updates now support the use of these
1269 additional algorithms: hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384,
1273 - Added check for invalid failover message type. Thanks to Tobias Stoeckmann
1274 working with the OpenBSD project who spotted the issue and provided the
1278 - Corrected rate limiting checks for bad packet logging. Thanks to Tobias
1279 Stoeckmann working with the OpenBSD project who spotted the issue and
1283 - Log statements depicting what files will be used by the server now occur
1284 after the configuration file has been processed.
1287 - Addressed Coverity issues reported as of 07-31-2014:
1288 [ISC-Bugs #36712] Corrects Coverity reported "high" impact issues.
1289 [ISC-Bugs #36933] Corrects Coverity reported "medium" impact issues
1290 [ISC-Bugs #37708] Fixes compilation error in dst_api.c seen in older
1291 compilers that was introduced by #36712
1293 - Server now supports a failover split value of 256.
1296 - Remove unneeded error #defines. These defines were included in case
1297 external programs required the older versions of the macro. They
1298 have been #ifdeffed for now and will be removed at a future date.
1299 See site.h for the #define to include them again, but you should
1300 switch to using the DHCP_R_* versions instead of the ISC_R_* versions.
1301 Also ISC_R_MULTIPLE has been removed as it is also defined in bind.
1304 - Added checks in range6 and prefix6 statement parsing to ensure addresses
1305 are within the declared subnet. Thanks to Jiri Popelka at Red Hat for the
1306 bug report and patch.
1313 - Addressed checksum issues:
1314 Added checksum readiness check to Linux packet filtering which eliminates
1315 invalid packet drops due to checksum errors when checksum offloading is
1316 in use. Based on dhcp-4.2.2-xen-checksum.patch made to the Fedora project.
1323 Inbound packets with UDP checksums of 0xffff now validate correctly rather
1328 - Added the echo-client-id configuration parameter to the server configuration.
1329 The server now supports RFC 6842 compliant behavior by setting a new
1330 configuration parameter, echo-client-id. When enabled, the server will
1331 include the client identifier option (Option code 61) if received, in its
1332 responses. The server identifier returned in NAKs (if enabled) will now
1333 be the globally defined value (if one) if the server cannot attribute the
1334 inbound request to a known subnet.
1338 - Added support of the configuration parameter, use-host-decl-names, to
1339 BOOTP request handling.
1342 - Added logic to ignore the signal, SIGPIPE, which ensures write failures
1343 will be delivered as errors rather than as SIGPIPE signals on all OSs.
1344 Thanks to Marius Tomaschewski from SUSE who reported the issue and provided
1345 the patch upon which the fix is based.
1348 - In the failover code, handle the case of communications being interrupted
1349 when the servers are dealing with POTENTIAL-CONFLICT. This patch allows
1350 the primary to accept the secondary moving from POTENTIAL-CONFLICT to
1351 RESOLUTION-INTERRUPTED as well as handling the bind update process better.
1352 In addition the code to resend update or update all requests has been
1353 modified to send requests more often.
1357 - By default, the server will now choose the value to use in the forward DNS
1358 name from the following in order of preference:
1360 1. FQDN option if provided by the client
1361 2. Host name option if provided by the client
1362 3. Configured option host-name if defined
1364 As before, this may be overridden by defining ddns-hostname to the desired
1365 value (or expression). In addition, the server logic has been extended to
1366 use the value of the host name declaration if use-host-decl-names is enabled
1367 and no other value is available.
1370 - DNS updates were being attempted when dhcp-cache-threshold enabled the use of
1371 the existing lease and the forward DNS name had not changed. This has been
1376 - Corrected an issue which caused dhclient to incorrectly form the result when
1377 prepending or appending to the IPv4 domain-search option, received from the
1378 server, when either of the values being combined contain compressed
1382 - Added the server-id-check parameter to the server configuration.
1383 This parameter allows run-time control over whether or not a server,
1384 participating in failover, verifies the dhcp-server-identifier option in
1385 DHCP REQUESTs against the server's id before processing the request.
1386 Formerly, enabling this behavior was done at compilation time through
1387 the use of the #define, SERVER_ID_CHECK, which has been removed from site.h
1388 The functionality is now only available through the new runtime parameter.
1391 - During startup, when the server encounters a lease whose binding state is
1392 FTS_BACKUP but whose pool has no configured failover peer, it will reset the
1393 lease's binding state to FTS_FREE. This allows the leases to be reclaimed
1394 by the server after a pool's configuration has changed from failover to
1395 standalone. Prior to this such leases would remain stuck in the backup state
1396 making them unavailable for assignment. Note this conversion will occur
1397 whether or not the server is compiled for failover.
1400 - Fixed a small issue in the treatment of hosts in the inform processing
1401 that could cause the response to an inform to include information from
1402 the wrong scope. The two examples we've heard of are getting subnet
1403 instead of group information associated with a host entry, or getting
1404 global information instead of subnet if the host entry was built via
1405 omapi. Thanks to Julien Soula at University of Lille for finding the
1406 bug and supplying a patch.
1409 - Avoid calling pool_timer() recursively from supersede_lease(). This could
1410 result in leases changing state incorrectly or delaying the running of the
1411 leae expiration code.
1414 - Move the check for a PID file and process to be before we rewrite the
1415 lease file. This avoids the possibility of starting a second instance
1416 of a server which changes the current lease file confusing the first
1417 instance. This check is only included if the admin hasn't disabled PID
1422 - In the client code change the way preferred_life and max_life are printed
1423 for environment variables to be unsigned rather than signed.
1424 Thanks to Jiri Popelka at Red Hat for the bug report and patch.
1427 - Modified Linux packet handling such that packets received via VLAN are now
1428 seen only by the VLAN interface. Prior to this, such packets were seen by
1429 both the VLAN interface and its parent (physical) interface, causing the
1430 server to respond to both. Note this remains an issue for non-Linux OSs.
1431 Thanks to Jiri Popelka at Red Hat for the patch.
1437 - Log content has been changed to more directly suggest that admins should
1438 check for multiple IPv6 clients attempting to use the same DUID when only
1439 abandoned addresses are available. Debug level logging will now emit counts
1440 of the total number of, in-use, and abandoned addresses in a shared subnet
1441 when the server finds no addresses available for a given DUID. Lastly,
1442 threshold logging is now automatically disabled for shared subnets whose
1443 total number of possible addresses exceeds (2^64)-1.
1447 - Added a global parameter, prefix-length-mode, which may be used to determine
1448 how the server uses a non-zero value for prefix-length supplied by clients
1449 when soliciting DHCPv6 prefixes. The server supports selection modes of:
1450 ignore, prefer, exact, minimum and maximum which are described in detail in
1451 the server man pages. The prior behavior of the server was to only offer a
1452 prefix whose length exactly matched the prefix-length value requested. If
1453 no such prefixes were available, the server returned a status of none
1454 available. Note the default mode, "exact", provides this same behavior.
1458 - Corrected inconsistencies in dhcrelay's setting the upper interface hop count
1459 limit such that it now sets it to 32 when the upstream address is a multicast
1460 address per RFC 3315 Section 20. Prior to this if the -u argument preceded
1461 the -l argument on the command line or if the same interface was specified
1462 for both; the logic to set the hop limit count for the upper interface was
1463 skipped. This caused the hop count limit to be set to the default value
1464 (typically 1) in the outbound upstream packets.
1467 Changes since 4.3.1b1
1469 - Modify the linux and openwrt dhclient scripts to process information
1470 from a stateless request. Thanks to Jiri Popelka at Red Hat for the
1471 bug report and patch.
1474 - Remove more unused RCSID tags. These weren't noticed in 4.3 as
1475 the code isn't used anymore but we remove them here to keep the
1476 code consistent across versions.
1481 - Tidy up several small tickets.
1482 Correct parsing of DUID from config file, previously the LL type
1483 was put in the wrong place in the DUID string.
1485 Add code to parse "do-forward-updates" as well as "do-forward-update"
1486 Thanks to Jiri Popelka at Red Hat.
1488 Remove log_priority as it isn't currently used.
1490 Increase the size of the buffer used for reading interface information.
1493 - Remove an extra set of the msg_controllen variable.
1496 - Add a more understandable error message if a configuration attempts
1497 to add multiple keys for a single zone. Thanks to a patch from Jiri
1501 - Fix some minor issues in the dst code.
1504 - Properly #ifdef functions so that the code can compile without NSUPDATE.
1507 - Update the partner's stos (start time of state, basically when we last
1508 heard from this partner) field when updating the state in failover.
1511 - Modify the overload processing to allow space for the remote agent ID.
1513 Handle the ordering of the SUBNET_MASK option even if it is the last
1517 - Remove the code that allows a server to follow RFC3315 instead of
1518 the subsequent errata from August 2010 when determining which IAs
1519 to include if no addresses will be assigned.
1522 - Remove unused RCSID tags.
1525 - Correct the v6 client timing code. When doing the timing backoff
1526 for MRT limit it to MRD.
1527 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
1530 - Add a log entry when killing a client and remove the PID files
1531 when a server, relay or client are killed.
1535 - Some minor cleanups in the client code.
1536 In addition to checking for dhcpc check for bootpc in the services list.
1538 Correct the client code to only try to get a lease once when the
1539 given the "-1" argument.
1540 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
1542 When asked for the version don't send the output to syslog.
1544 Add the next server information to the environment variables for
1545 use by the client script. In order to avoid changing the client
1546 lease file the next server information isn't written to it.
1547 Thanks to Tomas Hozza at Red Hat for the suggestion and a prototype fix.
1550 - Several updates to the dhcp server code.
1551 When not in quiet mode print out the files being used.
1553 As accessing some pid files may require privileges move the dropping
1554 of permission bits due to the paranoia patch to be after the pid code.
1555 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
1557 When processing a "--version" request don't output the version information
1560 - Add the "enable-log-pid" build option to the configure script. When enabled
1561 this causes the client, server and relay programs to include the PID
1562 number in syslog messages.
1563 Thanks to Marius Tomaschewski for the suggestion and proto-patch.
1566 - Add a #define to specify the prefix length used when a client attempts
1567 to configure an address. This can be modified by editing includes/site.h.
1568 By default it is set to 64. While 128 might be a better choice it would
1569 also be a change for currently running systems, so we have left it at 64.
1572 - Add a run time option to the client "-df" to allow the administrator to
1573 point to a second lease file the client can search for a DUID. This can
1574 be used to allow a v4 and a v6 instance of the client to share a DUID.
1575 The second file will only be searched if there isn't a DUID in the main
1576 lease file and the DUID will be written out to the main lease file.
1579 - Have the client fsync the lease file to avoid lease corruption if the
1580 client hibernates or otherwise shuts down.
1583 - Add a check for L2VLAN in bpf.c to help support VLAN interfaces
1584 Thanks to Steinar Haug for the suggestion.
1587 - Modify the handling of the resolv.conf file to allow the DHCP
1588 process to start up even if the resolv.conf file has problems.
1591 - Add threshold logging functionality. Two new options,
1592 log-threshold-low and log-threshold-high, indicate to the
1593 server if and when it should log an error message as addresses
1597 - Add code to properly dereference a pointer in the dhclient code
1598 on an error condition.
1601 - Add code to help clean up soft leases.
1604 - Disable the gentle shutdown functionality until we can determine
1605 the best way to present it to remove or reduce the side effects.
1608 Changes since 4.3.0rc1
1611 Changes since 4.3.0b1
1613 - Tidy up receive packet processing.
1614 Thanks to Brad Plank of GTA for reporting the issue and suggesting
1618 Changes since 4.3.0a1
1620 - Modify the message displayed when a process hits a fatal error.
1621 The new message is much shorter and simply points to the README
1622 and our website for directions on bug submissions.
1625 Changes since 4.2.0 (new features)
1627 - If a client renews before 'dhcp-cache-threshold' percent of its lease
1628 has elapsed (default 25%), the server will reuse the allocated lease
1629 (provide a lease within the currently allocated lease-time) rather
1630 than extend or renew the lease. This absolves the server of needing
1631 to perform an fsync() operation on the lease database before reply,
1632 which improves performance. [ISC-Bugs #22228]
1633 Updated this patch to support asynchronous DDNS. If the server is
1634 attempting to do DDNS on a lease it should be updated and written to
1635 disk even if that wouldn't be necessary due to the thresholding.
1638 - The 'no available billing' log line now also logs the name of the last
1639 matching billing class tried before failing to provide a billing.
1642 - A problem with missing get_hw_addr function when --enable-use-sockets
1643 was used is now solved on GNU/Linux, BSD and GNU/Hurd systems. Note
1644 that use-sockets feature was not tested on those systems. Client and
1645 server code no longer use MAX_PATH constant that is not defined on
1646 GNU/Hurd systems. [ISC-Bugs #25979]
1648 - Add a perl script in the contrib directory, dhcp-lease-list.pl, which
1649 can parse v4 lease files and output the lease information in a more
1650 human friendly manner. This was written by Christian Hammers with
1651 some updates by vom and ISC. This is contributed code and is not
1652 supported by ISC; however it may be useful to some users.
1655 - Add support in v6 for on-commit, on-expire and on-release.
1658 - Add support for using classes with v6.
1661 - Update the DDNS code to current standards and allow for sharing
1662 of DDNS entries between v4 and v6 clients. The new code is used
1663 if the ddns-update-style is set to "standard", the older code is
1664 still available if ddns-update-style is set to "interim". The
1665 oldest DDNS code "ad-hoc" has been removed. Thanks to Thomas Pegeot
1666 who submitted a patch for this issue. This patch is based on
1667 that work with some modifications.
1670 - Add a configuration option to the server to suppress using fsync().
1671 Enabling this option will mean that fsync() is never called. This
1672 may provide better performance but there is also a risk that a lease
1673 will not be properly written to the disk after it has been issued
1674 to a client and before the server stops. Using this option is
1678 - Add some logging statements to indicate when the server is ready
1679 to serve. One statement is emitted after the server has finished
1680 reading its files and is about to enter the dispatch loop.
1681 This is "Server starting service.".
1682 The second is emitted when a server determines that both it and
1683 its failover peer are in the normal state.
1684 This is "failover peer <name>: Both servers normal."
1687 - Add support for accessing options from v6 relays. The v6relay
1688 statement allows the administrator to choose which relay to
1689 use when searching for an option, see the dhcp-options man page
1690 for a description. The host-identifier option has also been
1691 updated to support the use of relay options, see the dhcpd.conf
1692 man page for a description.
1695 - When doing DDNS if there isn't an appropriate zone statement attempt
1696 to find a reasonable nameserver via a DNS resolver. This restores
1697 some functionality that was lost in the transition to asynchronous
1698 DDNS. Due to the lack of security and increase in fragility of the
1699 system when using this feature we strongly recommend the use of
1700 appropriate zone statements rather than using this functionality.
1703 - Add support for specifying the address from which to send
1704 DDNS updates on the DHCP server. There are two new options
1705 "ddns-local-address4" and "ddns-local-address6" that each take
1706 one instance of their respective address types.
1709 - Add ignore-client-uids option in the server. This option causes
1710 the server to not record a client's uid in its lease. This
1711 violates the specification but may also be useful when a client
1712 can dual boot using different client ids but the same mac address.
1713 Thank you to Brian De Wolf at Cal Poly Pomona for the patch.
1717 - Extend the DHCPINFORM processing to honor the subnet selection option
1718 and take host declarations into account.
1719 Thanks to Christof Chen for testing and submitting the patch.
1722 - Extend the hardware expression to look into the lease structure
1723 for a hardware address if there is no packet. This allows the
1724 server to find the hardware address during on-expiry processing.
1727 - Add definitions for some options that have been specified by the IETF.
1731 Changes since 4.2.0 (bug fixes)
1733 - When using 'ignore client-updates;', the FQDN returned to the client
1734 is no longer truncated to one octet.
1736 - Cleaned up an unused hardware address variable in nak_lease().
1738 - Manpage entries for the ia-pd and ia-prefix options were updated to
1739 reflect support for prefix delegation.
1741 - Cleaned up some compiler warnings
1743 - An optimization described in the failover protocol draft is now included,
1744 which permits a DHCP server operating in communications-interrupted state
1745 to 'rewind' a lease to the state most recently transmitted to its peer,
1746 greatly increasing a server's endurance in communications-interrupted.
1747 This is supported using a new 'rewind state' record on the dhcpd.leases
1748 entry for each lease.
1750 - Fix the trace code which was broken by the changes to the DDNS code.
1752 - Update the fsync code to work with the changes to the DDNS code. It now
1753 uses a timer instead of noticing if there are no more packets to process.
1755 - When constructing the DNS name structure from a text string append
1756 the root to relative names. This satisfies a requirement in the DNS
1757 library that names be absolute instead of relative and prevents DHCP
1758 from crashing. [ISC-Bugs #21054]
1760 - "The LDAP Patch" that has been circulating for some time, written by
1761 Brian Masney and S.Kalyanasundraram and maintained for application to
1762 the DHCP-4 sources by David Cantrell has been included. Please be
1763 advised that these sources were contributed, and do not yet meet the
1764 high standards we place on production sources we include by default.
1765 As a result, the LDAP features are only included by using a compile-time
1766 option which defaults off, and if you enable it you do so under your
1767 own recognizance. We will be improving this software over time.
1770 - Prohibit including lease time information in a response to a DHCP INFORM.
1773 ! Accept a client id of length 0 while hashing. Previously the server would
1774 exit if it attempted to hash a zero length client id, providing attackers
1775 with a simple denial of service attack. [ISC-Bugs #21253]
1776 CERT: VU#541921 - CVE: CVE-2010-2156
1778 - A memory leak in ddns processing was closed. [ISC-Bugs #21377]
1780 - Modify the exception handling for initial context creation. Previously
1781 we would try and clean up before exiting. This could present problems
1782 when the cleanup required part of the context that wasn't available. It
1783 also didn't do much as we exited afterwards anyway. Now we simply log
1784 the error and exit. [ISC-Bugs #21093]
1786 - A bug was fixed that could cause the DHCPv6 server to advertise/assign a
1787 previously allocated (active) lease to a client that has changed subnets,
1788 despite being on different shared networks. Dynamic prefixes specifically
1789 allocated in shared networks also now are not offered if the client has
1790 moved. [ISC-Bugs #21152]
1792 - Add some debugging output for use with the DDNS code. [ISC-Bugs #20916]
1794 - Fix the trace code to handle timing events better and to truncate a file
1795 before using instead of overwriting it. [ISC-Bugs #20969]
1797 - Modify the determination of the default TTL to use for DDNS updates.
1798 The user may still configure the ttl via ddns-ttl. The default for
1799 both v4 and v6 is now 1/2 the (preferred) lease time with a limit. The
1800 previous defaults (1/2 lease time without a limit for v4 and a default
1801 value for v6) may be used by defining USE_OLD_DDNS_TTL in site.h
1804 - libisc/libdns is now brought up to version 9.7.1rc1. This corrects
1805 three reported flaws in ISC DHCP;
1807 o DHCP processes (dhcpd, dhclient) fail to start if one of either the
1808 IPv4 or IPv6 address families is not present. [ISC-Bugs #21122]
1810 o Assertion failure when attempting to cancel a previously running DDNS
1811 update. [ISC-Bugs #21133]
1813 o Compilation failure of libisc/libdns due to the use of a flexible
1814 array member. [ISC-Bugs #21316]
1816 - Add declaration for variable in debug code in alloc.c. [ISC-Bugs #21472]
1818 - Documentation cleanup covering multiple tickets
1819 [ISC-Bugs #20265] [ISC-Bugs #20259] minor cleanup
1820 [ISC-Bugs #20263] add text describing some default values
1821 [ISC-Bugs #20193] single quotes at the start of a line indicate a control
1822 line to nroff, escape them if we actually want a quote.
1823 [ISC-Bugs #18916] sync the pointer to web pages amongst the different docs
1825 - 'get-host-names true;' now also works even if 'use-host-decl-names true;'
1826 was also configured. The nature of this repair also fixes another
1827 error; the host-name supplied by a client is no longer overridden by a
1828 reverse lookup of the lease address. Thanks to a patch from Wilco Baan
1829 Hofman supplied to us by the Debian package maintenance team.
1830 [ISC-Bugs #21691] {Debian Bug#509445}
1832 - The .TH tag for the dhcp-options manpage was typo repaired
1833 thanks to a report from jidanni and the Debian package maintenance
1834 team. [ISC-Bugs #21676] {Debian Bug#563613}
1836 - More documentation changes - primarily to put the options in the dhclient
1837 and dhcpd man pages into the standard form. Thanks in part to a patch
1838 from David Cantrell at Red Hat.
1839 [ISC-Bugs #20264] and parts of [ISC-Bugs #17744] dhclient.8 changes
1841 - Add code to clear the pointer to an object in an OMAPI handle when the
1842 object is freed due to a dereference. [ISC-Bugs #21306]
1844 - Fixed a bug that leaks host record references onto lease structures,
1845 causing the server to apply configuration intended for one host to any
1846 other innocent clients that come along later. [ISC-Bugs #22018]
1849 [ISC-Bugs #19566] When trying to find the zone for a name for ddns allow
1850 the name to be at the apex of the zone.
1851 [ISC-Bugs #19617] Restrict length of interface name read from command line
1852 in dhcpd - based on a patch from David Cantrell at Red Hat.
1853 [ISC-Bugs #20039] Correct some error messages in dhcpd.c
1854 [ISC-Bugs #20070] Better range check on values when creating a DHCID.
1855 [ISC-Bugs #20198] Avoid writing past the end of the field when adding
1856 overly long file or server names to a packet and add a log message
1857 if the configuration supplied overly long names for these fields.
1858 Thanks to Martin Pala.
1859 [ISC-Bugs #21497] Add a little more randomness to rng seed in client
1860 thanks to a patch from Jeremiah Jinno.
1862 - Correct error handling in DLPI [ISC-Bugs #20378]
1864 - Remove __sun__ and __hpux__ typedefs in osdep.h as they are now being
1865 checked in configure. [ISC-Bugs #20443]
1867 - Modify how the cmsg header is allocated the v6 send and received routines
1868 to compile on more compilers. [ISC-Bugs #20524]
1870 - When parsing a domain name free the memory for the name after we are
1871 done with it. [ISC-Bugs #20824]
1873 - Add an elapsed time option to the release message and refactor the
1874 code to move most of the common code to a single routine.
1877 - Two identical log messages for commit_leases() have been disambiguated.
1880 - Parse date strings more properly - the code now handles semi-colons in
1881 date strings correctly. Thanks to a patch from Jiri Popelka at Red Hat.
1882 [ISC-Bugs #21501, #20598]
1884 - Fixes to lease input and output.
1885 [ISC-Bugs #20418] - Some systems don't support the "%s" argument to
1886 strftime, paste together the same string using mktime instead.
1887 [ISC-Bugs #19596] - When parsing iaid values accept printable
1889 [ISC-Bugs #21585] - Always print time values in omshell as hex
1890 instead of ascii if the values happen to be printable characters.
1892 - Minor changes for scripts, configure.ac and Makefiles
1893 [ISC-Bugs #19147] Use domain-search instead of domain-name in manual and
1894 example conf file. Thanks to a patch from David Cantrell
1896 [ISC-Bugs #19761] Restore address when doing a rebind in DHCPv6
1897 [ISC-Bugs #19945] Properly close the quote on some arguments.
1898 [ISC-Bugs #20952] Add 64 bit types to configure.ac
1899 [ISC-Bugs #21308] Add "PATH=" to CLIENT_PATH environment variable
1901 - Update the code to parse dhcpv6 lease files to accept a semi-colon at
1902 the end of the max-life and preferred-life clauses. In order to be
1903 backwards compatible with older lease files not finding a semi-colon
1904 is also accepted. [ISC-Bugs #22303].
1906 ! Handle a relay forward message with an unspecified address in the
1907 link address field. Previously such a message would cause the
1908 server to crash. Thanks to a report from John Gibbins. [ISC-Bugs #21992]
1909 CERT: VU#102047 CVE: CVE-2010-3611
1911 - ./configure on longer searches for -lcrypto to explicitly link against.
1912 This fixes a bug where 'dhclient' would have shared library dependencies
1913 on '/usr/lib'. [ISC-Bugs #21967]
1915 - Handle pipe failures more gracefully. Some OSes pass a SIGPIPE
1916 signal to a process and will kill the process if the signal isn't
1917 caught. This patch adds code to turn off the SIGPIPE signal via
1918 a setsockopt() call. The signal is already being ignored as part
1919 of the ISC library. [ISC-Bugs #22269]
1921 - Restore printing of values in omshell to the style pre 21585. For
1922 21585 we changed the print routines to always display time values
1923 as a hex list. This had a side effect of printing all data strings
1924 as a hex list. We shall investigate other ways of displaying time
1925 values more usefully. [ISC-Bugs #22626]
1927 ! Fix the handling of connection requests on the failover port.
1928 Previously a connection request from a source that wasn't
1929 listed as a failover peer would cause the server to become
1930 non-responsive. Thanks to a report from Brad Bendily, brad@bendily.com.
1932 CERT: VU#159528 CVE: CVE-2010-3616
1934 - Don't pass the ISC_R_INPROGRESS status to the omapi signal handlers.
1935 Passing it through to the handlers caused the omshell program to fail
1936 to connect to the server. [ISC-Bugs #21839]
1938 - Fix the parenthesis in the code to process configuration statements
1939 beginning with "auth". The previous arrangement caused
1940 "auto-partner-down" to be processed incorrectly. [ISC-Bugs #21854]
1942 - Limit the timeout period allowed in the dispatch code to 2^^32-1 seconds.
1943 Thanks to a report from Jiri Popelka at Red Hat.
1944 [ISC-Bugs #22033], [Red Hat Bug #628258]
1946 - When processing the format flags for a given option consume the
1947 flag indicating an optional value correctly. A symptom of this
1948 bug was an infinite loop when trying to parse the slp-service-scope
1949 option. Thanks to a patch from Marius Tomaschewski.
1952 - Disable the use of kqueue in the ISC library. This avoids a problem
1953 between the fork and socket code that caused the dhcpd process to
1954 use all available cpu if the program daemonized itself.
1957 ! When processing a request in the DHCPv6 server code that specifies
1958 an address that is tagged as abandoned (meaning we received a
1959 decline request for it previously) don't attempt to move it from
1960 the inactive to active pool as doing so can result in the server
1961 crashing on an assert failure. Also retag the lease as active
1962 and reset its timeout value.
1965 - Removed the restriction on using IPv6 addresses in IPv4 mode. This
1966 allows IPv4 options which contain IPv6 addresses to be specified. For
1967 example the 6rd option can be specified and used like this:
1970 option 6rd code 212 = { integer 8, integer 8,
1971 ip6-address, array of ip-address };
1972 option 6rd 16 10 2001:: 1.2.3.4, 5.6.7.8;
1974 - Handle some DDNS corner cases better. Maintain the DDNS transaction
1975 information when updating a lease and cancel any existing transactions
1976 when removing the ddns information.
1979 - Some fixes for LDAP
1980 [ISC-Bugs #21783] - Include lber library when building ldap
1981 [ISC-Bugs #22888] - Enable the ldap code when buidling common
1982 The above fixes are from Jiri Popelka at Red Hat.
1984 - Modify the dlpi code to accept getmsg() returning a positive value.
1987 ! In dhclient check the data for some string options for
1988 reasonableness before passing it along to the script that
1989 interfaces with the OS.
1993 - DHCPv6 server now responds properly if client asks for a prefix that
1994 is already assigned to a different client. [ISC-Bugs #23948]
1996 - Add the option "--no-pid" to the client, relay and server code,
1997 to disable writing a pid file. Add the option "-pf pidfile"
1998 to the relay to allow the user to supply the pidfile name at
1999 runtime. Add the "with-relay6-pid-file" option to configure
2000 to allow the user to supply the pidfile name for the relay
2001 in v6 mode at configure time.
2002 [ISC-Bugs #23351] [ISC-Bugs #17541]
2004 - 'dhclient' no longer waits a random interval after first starting up to
2005 begin in the INIT state. This conforms to RFC 2131, but elects not to
2006 implement a 'SHOULD' direction in section 4.1. The goal of this change
2007 is to start up faster. [ISC-Bugs #19660]
2009 - Added 'initial-delay' parameter that specifies maximum amount of time
2010 before client goes to the INIT state. The default value is 0. In previous
2011 versions of the code client could wait up to 5 seconds. The old behavior
2012 may be restored by using 'initial-delay 5;' in the client config file.
2015 - ICMP ping-check should now sit closer to precisely the number of seconds
2016 configured (or default 1), due to making use of the new microsecond
2017 scale timer internally to dhcpd. This corrects a bug where the server
2018 may immediately timeout an ICMP ping-check if it was made late in the
2019 current second. [ISC-Bugs #19660]
2021 - The DHCP client will schedule renewal and rebinding events in
2022 microseconds if the DHCP server provided a lease-time that would result
2023 in sub-1-second timers. This corrects a bug where a 2-second or lower
2024 lease-time would cause the DHCP client to enter an infinite loop by
2025 scheduling renewal at zero seconds. [ISC-Bugs #19660]
2027 - Client lease records are recorded at most once every 15 seconds. This
2028 keeps the client from filling the lease database disk quickly on very small
2029 lease times. [ISC-Bugs #19660]
2031 - To defend against RFC 2131 non-compliant DHCP servers which fail to
2032 advertise a lease-time (either mangled, or zero in value) the DHCP
2033 client now adds the server to the reject list ACL and returns to INIT
2034 state to hopefully find an RFC 2131 compliant server (or retry in INIT
2035 forever). [ISC-Bugs #19660]
2037 - Parameters configured to evaluate from user defined function calls can
2038 now be correctly written to dhcpd.leases (as on 'on events' or dynamic
2039 host records inserted via OMAPI). [ISC-Bugs #22266]
2041 - If a 'next-server' parameter is configured in a dynamic host record via
2042 OMAPI as a domain name, the syntax written to disk is now correctly parsed
2043 upon restart. [ISC-Bugs #22266]
2045 - The DHCP server now responds to DHCPLEASEQUERY messages from agents using
2046 IP addresses not covered by a subnet in configuration. Whether or not to
2047 respond to such an agent is still governed by the 'allow leasequery;'
2048 configuration parameter, in the case of an agent not covered by a configured
2049 subnet the root configuration area is examined. Server now also returns
2050 vendor-class-id option, if client sent it. [ISC-Bugs #21094]
2052 - Documentation fixes
2053 [ISC-Bugs #17959] add text to AIX section describing how to have it send
2054 responses to the all-ones address.
2055 [ISC-Bugs #19615] update the includes in dhcpctl/dhcpctl.3 to be more correct
2056 [ISC-Bugs #20676] update dhcpd.conf.5 to include the RFC numbers for DDNS
2058 - Relay no longer crashes, when DHCP packet is received over interface without
2059 any IPv4 address assigned. Also extended logging message about discarding
2060 packets with invalid hlen with information about relevant interface name.
2063 - Relay now properly logs that packet was received over interface without
2064 global IPv6 address [ISC-Bugs #24070]
2066 - Linux Packet Filter interface improvement. sockaddr_pkt structure is used,
2067 rather than sockaddr. Packet ethertype is now forced to ETH_P_IP.
2070 - Minor code cleanups - but note port change for #23196
2071 [ISC-Bugs #23470] - Modify when an ignore return macro is defined to
2072 handle unsed error return warnings for more versions of gcc.
2073 [ISC-Bugs #23196] - Modify the reply handling in the server code to
2074 send to a specified port rather than to the source port for the incoming
2075 message. Sending to the source port was test code that should have
2076 been removed. The previous functionality may be restored by defining
2077 REPLY_TO_SOURCE_PORT in the includes/site.h file. We suggest you don't
2078 enable this except for testing purposes.
2079 [ISC-Bugs #22695] - Close a file descriptor in an error path.
2080 [ISC-Bugs #19368] - Tidy up variable types in validate_port.
2082 - Code cleanup: remove obsolete PROTO, KandR, INLINE and ANSI_DECL macros
2085 - Compilation problem with gcc4.5 and omshell.c resolved. [ISC-Bugs #23831]
2087 - Client Script fixes
2088 [ISC-Bugs #23045] Typos in client/scripts/openbsd
2089 [ISC-Bugs #23565] In the client scripts add a zone id (interface id) if
2090 the domain search address is link local.
2091 [ISC-Bugs #1277] In some of the client scripts add code to handle the
2092 case of the default router information being changed without the address
2095 - Documentation cleanup
2096 [ISC-Bugs #23326] Updated References document, several man page updates
2098 - Server no longer complains about NULL pointer when configured
2099 server-identifier expression fails to evaluate. [ISC-Bugs #24547]
2101 - Convert ISC_R_INPROGRESS status to ISC_R_SUCCESS when called from other
2102 than the dispatch handler. This fixes an issue where omshell, when
2103 run from the same platform as the server, would appear to fail to
2104 connect. This is a companion to #21839. [ISC-Bugs #23592]
2106 - Enlarge the buffer size used by the Omshell code and some of the
2107 print routines to allow for greater than 60 characters or, when
2108 printing as hex strings, 20 characters. [ISC-Bugs #22743]
2110 - In Solaris 11 switch to using sockets instead of DLPI, thanks
2111 to a patch form Oracle. [ISC-Bugs #24634].
2113 - Strict checks for content of domain-name DHCPv4 option can now be
2114 configured during compilation time. Even though RFC2132 does not allow
2115 to store more than one domain in domain-name option, such behavior is
2116 now enabled by default, but this may change some time in the future.
2117 See ACCEPT_LIST_IN_DOMAIN_NAME define in includes/site.h.
2120 - DNS Update fix. A misconfigured server could crash during DNS update
2121 processing if the configuration included overlapping pools or
2122 multiple fixed-address entries for a single address. This issue
2123 affected both IPv4 and IPv6. The fix allows a server to detect such
2124 conditions, provides the user with extra information and recommended
2125 steps to fix the problem. If the user enables the appropriate option
2126 in site.h then server will be terminated
2129 ! Two packets were found that cause a server to halt. The code
2130 has been updated to properly process or reject the packets as
2131 appropriate. Thanks to David Zych at University of Illinois
2132 for reporting this issue. [ISC-Bugs #24960]
2133 One CVE number for each class of packet.
2137 - Fix the code that checks for an existing DDNS transaction to cancel
2138 when removing DDNS information, so that we will continue with the
2139 processing if we have a lease even if it doesn't have an outstanding
2140 transaction. [ISC-Bugs #24682]
2142 - Add AM_MAINTAINER_MODE to configure.ac to avoid rebuilding
2143 configuration files. [ISC-Bugs #24107]
2145 - Add support for passing DDNS information to a DNS server over
2146 an IPv6 address. [ISC-Bugs #22647]
2148 - Enhanced patch for 23595 to handle IPv4 fixed addresses more
2149 cleanly. [ISC-Bugs #23595]
2151 ! Add a check for a null pointer before calling the regexec function.
2152 Without this check we could, under some circumstances, pass
2153 a null pointer to the regexec function causing it to segfault.
2154 Thanks to a report from BlueCat Networks.
2158 ! Modify the DDNS handling code. In a previous patch we added logging
2159 code to the DDNS handling. This code included a bug that caused it
2160 to attempt to dereference a NULL pointer and eventually segfault.
2161 While reviewing the code as we addressed this problem, we determined
2162 that some of the updates to the lease structures would not work as
2163 planned since the structures being updated were in the process of
2164 being freed: these updates were removed. In addition we removed an
2165 incorrect call to the DDNS removal function that could cause a failure
2166 during the removal of DDNS information from the DNS server.
2167 Thanks to Jasper Jongmans for reporting this issue.
2171 - Fixed the code that checks if an address the server is planning
2172 to hand out is in a reserved range. This would appear as
2173 the server being out of addresses in pools with particular ranges.
2176 - In the DDNS code handle error conditions more gracefully and add more
2177 logging code. The major change is to handle unexpected cancel events
2178 from the DNS client code.
2181 - Tidy up the receive calls and eliminate the need for found_pkt.
2184 - Add support for Infiniband over sockets to the server and
2185 relay code. We've tested this on Solaris and hope to expand
2186 support for Infiniband in the future. This patch also corrects
2187 some issues we found in the socket code.
2190 - Add a compile time check for the presence of the noreturn attribute
2191 and use it for log_fatal if it's available. This will help code
2192 checking programs to eliminate false positives.
2195 - Fixed many compilation problems ("set, but not used" warnings) for
2196 gcc 4.6 that may affect Ubuntu 11.10 users. [ISC-Bugs #27588]
2198 - Modify the code that determines if an outstanding DDNS request
2199 should be cancelled. This patch results in cancelling the
2200 outstanding request less often. It fixes the problem caused
2201 by a client doing a release where the TXT and PTR records
2202 weren't removed from the DNS.
2205 - Use offsetof() instead of sizeof() to get the sizes for dhcpv6_relay_packet
2206 and dhcpv6_packet in several more places. Thanks to a report from
2207 Bruno Verstuyft and Vincent Demaertelaere of Excentis.
2210 - Remove outdated note in the description of the bootp keyword about the
2211 option not satisfying the requirement of failover peers for denying
2212 dynamic bootp clients.
2215 - Multiple items to clean up IPv6 address processing.
2216 When processing an IA that we've seen check to see if the
2217 addresses are usable (not in use by somebody else) before
2219 When reading in leases from the file discard expired addresses.
2220 When picking an address for a client include the IA ID in
2221 addition to the client ID to generally pick different addresses
2223 [ISC-Bugs #23138] [ISC-Bugs #27945] [ISC-Bugs #25586]
2226 - Remove unnecessary checks in the lease query code and clean up
2227 several compiler issues (some dereferences of NULL and treating
2228 an int as a boolean).
2231 - Fix the NA and PD allocation code to handle the case where a client
2232 provides a preference and the server doesn't have any addresses or
2233 prefixes available. Previously the server ignored the request with
2234 this patch it replies with a NoAddrsAvail or NoPrefixAvail response.
2235 By default the code performs according to the errata of August 2010
2236 for RFC 3315 section 17.2.2; to enable the previous style see the
2237 section on RFC3315_PRE_ERRATA_2010_08 in includes/site.h. This option
2238 may be removed in the future.
2239 Thanks to Jiri Popelka at Red Hat for the patch.
2242 - Fix up some issues found by static analysis.
2243 A potential memory leak and NULL dereference in omapi.
2244 The use of a boolean test instead of a bitwise test in dst.
2247 - Rotate the lease file when running in v6 mode.
2248 Thanks to Christoph Moench-Tegeder at Astaro for the
2249 report and the first version of the patch.
2252 - Correct code to calculate timing values in client to compare
2253 rebind value to infinity instead of renew value.
2254 Thanks to Chenda Huang from H3C Technologies Co., Limited
2255 for reporting this issue.
2258 - Fix some issues in the code for parsing and printing options.
2259 [ISC-Bugs #22625] - properly print options that have several fields
2260 followed by an array of something for example "fIa"
2261 [ISC-Bugs #27289] - properly parse options in declarations that have
2262 several fields followed by an array of something for example "fIa"
2263 [ISC-Bugs #27296] - properly determine if we parsed a 16 or 32 bit
2264 value in evaluate_numeric_expression (extract-int).
2265 [ISC-Bugs #27314] - properly parse a zero length option from
2266 a lease file. Thanks to Marius Tomaschewski from SUSE for the report
2267 and prototype patch for this ticket as well as ticket 27289.
2269 ! Previously the server code was relaxed to allow packets with zero
2270 length client ids to be processed. Under some situations use of
2271 zero length client ids can cause the server to go into an infinite
2272 loop. As such ids are not valid according to RFC 2132 section 9.14
2273 the server no longer accepts them. Client ids with a length of 1
2274 are also invalid but the server still accepts them in order to
2275 minimize disruption. The restriction will likely be tightened in
2276 the future to disallow ids with a length of 1.
2277 Thanks to Markus Hietava of Codenomicon CROSS project for the
2278 finding this issue and CERT-FI for vulnerability coordination.
2282 ! When attempting to convert a DUID from a client id option
2283 into a hardware address handle unexpected client ids properly.
2284 Thanks to Markus Hietava of Codenomicon CROSS project for the
2285 finding this issue and CERT-FI for vulnerability coordination.
2289 ! A pair of memory leaks were found and fixed. Thanks to
2290 Glen Eustace of Massey University, New Zealand for finding
2295 - Existing legacy unit-tests have been migrated to Automated Test
2296 Framework (ATF). Several new tests have been developed. To enable
2297 unit-tests, please use --with-atf in configure script. A Developer's
2298 Guide has been added. To generate it, please use make devel in
2299 the doc directory. It is currently in early stages of development,
2300 but is expected to grow in the near future. [ISC-Bugs 25901]
2302 ! An issue with the use of lease times was found and fixed. Making
2303 certain changes to the end time of an IPv6 lease could cause the
2304 server to abort. Thanks to Glen Eustace of Massey University,
2305 New Zealand for finding this issue.
2309 - Update the memory leakage debug code to work with v6.
2312 - Relax the requirements for deleting an A or AAAA record.
2313 Previously the DDNS removal code required both the A or AAAA
2314 record and the TXT record to exist. This requirement could
2315 cause problems if something interrupted the removal leaving
2316 the TXT record alone. This relaxation was codified in RFC 4703.
2319 - Modify the failover code to handle incorrect peer names
2320 better. Previously the structure holding the name might
2321 have been freed inappropriately in some cases and not
2322 freed in other cases.
2325 - Add a configure option, enable-secs-byteorder, to deal with
2326 clients that do the byte ordering on the secs field incorrectly.
2327 This field should be in network byte order but some clients
2328 get it wrong. When this option is enabled the server will examine
2329 the secs field and if it looks wrong (high byte non zero and low
2330 byte zero) swap the bytes. The default is disabled. This option
2331 is only useful when doing load balancing within failover.
2334 - Fix a set of issues that were discovered via a code inspection
2335 tool. Thanks to Jiri Popelka and Tomas Hozza Red Hat for the logs
2339 - Parsing unquoted base64 strings improved. Parser now properly handles
2340 strings that contain reserved names. [ISC-Bugs #23048]
2342 - Modify the nak_lease function to make some attempts to find a
2343 server-identifier option to use for the NAK.
2346 - The client now passes information about the options it requested
2347 from the server to the script code via environment variables.
2348 These variables are of the form requested_<option_name>=1 with
2349 the option name being the same as used in the new_* and old_*
2353 - Add support for a simple check that the server id in a request message
2354 to a failover peer matches the server id of the server. This support
2355 is enabled by editing the file includes/site.h and uncommenting the
2356 definition for SERVER_ID_CHECK. The option has several restrictions
2357 and issues - please read the comment in the site.h file before
2361 - Tidy up some compiler issues in the debug code.
2364 - Move the dhcpd.conf example file to dhcpd.conf.example to avoid
2365 overwriting the dhcpd.conf file when installing a new version of
2366 ISC DHCP. The user will now need to manual copy and edit the
2367 dhcpd.conf file as desired.
2370 - Check the status value when trying to read from a connection to
2371 see if it may have been closed. If it appears closed don't try
2372 to read from it again. This avoids a potential busy-wait like
2373 loop when the peer names are mismatched.
2376 - Remove an unused variable to keep compilers happy.
2379 - Modify test makefiles to be more similar to standard makefiles
2380 and comment out a currently unused test.
2383 - Address static analysis warnings.
2384 [ISC-Bugs #33510] [ISC-Bugs #33511]
2386 - Silence benign static analysis warnings.
2389 - Add check for 64-bit package for atf.
2392 - Use newer auto* tool packages and turn on RFC_3542 support on Mac OS.
2395 - Remove a variable when it isn't being used due to #ifdefs to avoid
2396 a compiler warning on Solaris using GCC.
2399 - Add a check for too much whitespace in a config or lease file.
2400 Thanks to Paolo Pellegrino for finding the issue and a suggestion
2404 - Fix several problems with using OMAPI to manipulate class and subclass
2408 - Added a sleep call after killing the old client to allow time
2409 for the sockets to be cleaned. This should allow the -r option
2410 to work more consistently.
2413 - Missing files for ISC DHCP Developer's Guide are now included in
2414 the release tarballs. To generate this documentation, please use
2415 make devel command in doc directory. [ISC-Bugs #32767]
2417 - Update client script for use with openwrt.
2420 - Fix the socket handling for DHCPv6 clients to allow multiple instances
2421 of a client on a single machine to work properly. Previously only
2422 one client would receive the packets. Thanks to Jiri Popelka at Red Hat
2423 for the bug report and a potential patch.
2426 - Added support for gentle shutdown after signal is received.
2427 [ISC-Bugs #32692] [ISC-Bugs 34945]
2429 - Enhance the DHCPv6 server logging to include the addresses that are assigned
2433 - Fix an operation in the DDNS code to be a bitwise instead of logical or.
2437 Changes since 4.1.0 (new features)
2439 - Failover port configuration can now be left to defaults (port 647) as
2440 described in the -12 revision of the Failover draft (and assigned by
2441 IANA). Thanks in part to a patch from David Cantrell at Red Hat.
2443 - If configured, dhclient may now transmit to an anycast MAC address,
2444 rather than using a broadcast address. Thanks to a patch from David
2445 Cantrell at Red Hat.
2447 - Added client support for setting interface MTU and metric, thanks to
2448 Roy "UberLord" Marples <roy@marples.name>.
2450 - Added client -D option to specify DUID type to send.
2452 - A new failover configuration parameter has been introduced for those
2453 environments where DHCP servers can be reasonably guaranteed to be
2454 "down" when the failover TCP socket is severed, "auto-partner-down".
2455 This parameter is not generally safe, and by default is disabled, so
2456 please carefully review the documentation of this parameter in the
2457 dhcpd.conf(5) manpage before determining to use it yourself.
2459 - Added a configuration function, 'gethostname()', which calls the system
2460 function of the same name and presents the results as a data expression.
2461 This function can be used to incorporate the system level hostname of
2462 the system the DHCP software is operating on in responses or queries (such
2463 as including a failover partner's hostname in a dhcp message or binding
2464 scope, or having a DHCP client send any system hostname in the host-name or
2465 FQDN options by default).
2467 - The dhcp-renewal-time and dhcp-rebinding-time options may now be configured
2468 for DHCPv4 operation and used independently of the dhcp-lease-time
2469 calculations. Invalid renew and rebinding times (e.g., greater than the
2470 determined lease time) are omitted.
2472 - Processing the DHCP to DNS server transactions in an asynchronous fashion,
2473 the DHCP server or client can now continue with its processing while
2474 awaiting replies from the DNS server.
2476 - The 'hardware [ethernet|etc] ...;' parameter in host records has been
2477 extended to attempt to match DHCPv6 clients by the last octets of a
2478 DUID-LL or DUID-LLT provided by the client.
2480 Changes since 4.1.0 (bug fixes)
2482 - Remove infinite loop in token_print_indent_concat().
2484 - Validate the argument to the -p option.
2486 - The notorious 'option <unknown> ... larger than buffer' log line,
2487 which is seen in some malformed DHCP client packets, was modified.
2488 It now logs the universe name, and does not log the length values
2489 (which are bogus corruption read from the packet anyway). It also
2490 carries a hopefully more useful explanation.
2492 - Suppress spurious warnings from configure about --datarootdir
2494 - A bug was fixed that caused the server not to answer some valid Solicit
2495 and Request packets, if the dynamic range covering any requested addresses
2496 had been deleted from configuration.
2498 - Update the code to deal with GCC 4.3. This included two sets of changes.
2499 The first is to the configuration files to include the use of
2500 AC_USE_SYSTEM_EXTENSIONS. The second is to deal with return values that
2503 - The db-time-format option was documented in manpages.
2505 - Using reserved leases no longer results in 'lease with binding state
2506 free not on its queue' error messages, thanks to a patch from Frode
2509 - Fix a build error in dhcrelay, using older versions of gcc with
2512 - Two uninitialized stack structures are now memset to zero, thanks to a
2513 patch from David Cantrell at Red Hat.
2515 - Fixed a cosmetic bug where pretty-printing valid domain-search options would
2516 result in an erroneous error log message ('garbage in format string').
2518 - A bug in DLPI packet transmission (Solaris, HP/UX) that caused the server
2519 to stop receiving packets is fixed. The same fix also means that the MAC
2520 address will no longer appear 'bogus' on DLPI-based systems.
2522 - A bug in select handling was discovered where the results of one select()
2523 call were discarded, causing the server to process the next select() call
2524 and use more system calls than required. This has been repaired - the
2525 sockets will be handled after the first return from select(), resulting in
2528 - The update-conflict-detection feature would leave an FQDN updated without
2529 a DHCID (still currently implemented as a TXT RR). This would cause later
2530 expiration or release events to fail to remove the domain name. The feature
2531 now also inserts the client's up to date DHCID record, so records may safely
2532 be removed at expiration or release time. Thanks to a patch submitted by
2535 - Memory leak in the load_balance_mine() function is fixed. This would
2536 leak ~20-30 octets per DHCPDISCOVER packet while failover was in use
2537 and in normal state.
2539 - Various compilation fixes have been included for the memory related
2540 DEBUG #defines in includes/site.h.
2542 - Fixed Linux client script 'unary operator expected' errors with DHCPv6.
2544 - Fixed setting hostname in Linux hosts that require hostname argument
2545 to be double-quoted. Also allow server-provided hostname to
2546 override hostnames 'localhost' and '(none)'.
2548 - Fixed failover reconnection retry code to continue to retry to reconnect
2549 rather than restarting the listener.
2551 - Compilation on Solaris with USE_SOCKETS defined in includes/site.h has
2552 been repaired. Other USE_ overrides should work better.
2554 - A check for the local flavor of IFNAMSIZ had a broken 'else' condition,
2555 that probably still resulted in the correct behaviour (but wouldn't use
2556 a larger defined value provided by the host OS).
2558 - Fixed a bug where an OMAPI socket disconnection message would not result
2559 in scheduling a failover reconnection, if the link had not negotiated a
2560 failover connect yet (e.g.: connection refused, asynch socket connect()
2563 - A bug was fixed that caused the 'conflict-done' state to fail to be parsed
2564 in failover state records.
2566 ! A stack overflow vulnerability was fixed in dhclient that could allow
2567 remote attackers to execute arbitrary commands as root on the system,
2568 or simply terminate the client, by providing an over-long subnet-mask
2569 option. CERT VU#410676 - CVE-2009-0692
2571 - Fixed a bug where relay agent options would never be returned when
2572 processing a DHCPINFORM.
2574 - Versions 3.0.x syntax with multiple name->code option definitions is now
2575 supported. Note that, similarly to 3.0.x, for by-code lookups only the
2576 last option definition is used.
2578 - Fixed a bug where a time difference of greater than 60 seconds between a
2579 failover pair could cause the primary to crash on contact with the
2580 secondary. Thanks to a patch from Steinar Haug.
2582 - Don't look for IPv6 interfaces on Linux when running in DHCPv4 mode.
2583 Thanks to patches from Matthew Newton and David Cantrell.
2585 - Secondary servers in a failover pair will now perform ddns removals if
2586 they had performed ddns updates on a lease that is expiring, or was
2587 released through the primary. As part of the same fix, stale binding scopes
2588 will now be removed if a change in identity of a lease's active client is
2589 detected, rather than simply if a lease is noticed to have expired (which it
2590 may have expired without a failover server noticing in some situations).
2592 - A patch supplied by David Cantrell at RedHat was applied that detects
2593 invalid calling parameters given to the ns_name_ntop() function.
2594 Specifically, it detects if the caller passed a pointer and size pair
2595 that causes the pointer to integer-wrap past zero.
2597 ! Fixed a fenceposting bug when a client had two host records configured,
2598 one using 'uid' and the other using 'hardware ethernet'. CVE-2009-1892
2600 - Fixed the check in the dhcp_interface_signal_handler routine to verify
2601 the existence of the linked signal handler before calling it.
2603 - Both host and subnet6 configuration groups are now included whether a
2604 fixed-address6 (DHCPv6) is in use or not. Host scoped configuration takes
2605 precedence. This fixes two bugs, one where host scoped configuration
2606 would not be included from a non-fixed-address6 host record, and the equal
2607 and opposite bug where subnet6 scoped configuration would not be used when
2608 over-riding values were not present in a matching fixed-address6 host
2611 - ./configure now checks to ensure the intX_t and u_intX_t types are defined,
2612 correcting a compilation failure when using Sun's compiler.
2614 - Modified the handling of a connection to avoid releasing the omapi io
2615 object for the connection while it is still in use. One symptom from
2616 this error was a segfault when a failover secondary attempted to connect
2617 to the failover primary if their clocks were not synchronized.
2619 - Clean up to allow compilation with gcc 2.95.4 on FreeBSD. Remove an
2620 extra semi-colon from common/dns.c and moved setting a variable to NULL
2621 in server/dhcpv6.c to allow the compiler to decide that the variable
2622 was always properly set.
2624 Changes since 4.1.0b1
2626 - A missing "else" in dhcrelay.c could have caused an interface not to
2629 Changes since 4.1.0a2
2631 - A cosmetic bug in DHCPDECLINE processing was fixed which caused all
2632 successful DHCPDECLINEs to be logged as "not found" rather than
2635 - Added configuration file examples for DHCPv6.
2637 - Some failover debugging #defines have been better defined and some
2638 high frequency messages moved to a deeper debugging symbol.
2640 - The CLTT parameter in failover is now only updated by client activity,
2641 and not by failover binding updates (taking on the peer's CLTT).
2643 - Failover BNDUPD messages are now discarded if they conflict with an
2644 update that has been transmitted, but not acknowledged.
2646 - A bug cleaning up unknown-xxx temporary option definitions was fixed.
2648 - Delayed-ack is now a compile-time option, compiled out by default.
2649 This feature is simply too experimental for right now, and causes
2650 some problems to some failover installations. We will revisit this
2653 - The !inet_pton() call in res_mkupdrec was adjusted to '<= 0' as
2654 inet_pton returns either 1, 0, or -1.
2656 - A dhclient-script for MacOS X has been included, which enables
2657 'dhclient -6' support.
2659 - DDNS removal routines were updated so that the DHCID is not removed until
2660 the client has been deprived of all A and AAAA records (not only the last
2661 one of either of those). This resolves a bug where dual stack clients
2662 would not be able to regain their names after either expiration event.
2664 Changes since 4.1.0a1
2666 - Corrected list of failover state values in dhcpd man page.
2668 - Fixed a bug that caused some request types to be logged incorrectly.
2670 - Clients that sent a parameter request list containing the
2671 routers option before the subnet mask option were receiving
2672 only the latter. Fixed.
2674 - The server wasn't always sending the FQDN option when it should.
2676 - A partner-down failover server no longer emits 'peer holds all free leases'
2677 if it is able to newly-allocate one of the peer's leases.
2679 - Fixed a coredump when adding a class via OMAPI.
2681 - Check whether files are zero length before trying to parse them.
2683 - Ari Edelkind's PARANOIA patch has been included and may be compiled in
2684 via two ./configure parameters, --enable-paranoia and
2685 --enable-early-chroot.
2687 - ./configure was extended to cover many optional build features, such
2688 as failover, server tracing, debugging, and the execute() command.
2690 - There is now a default 1/4 of a second scheduled delay between delayed
2691 fsync()'s, it can be configured by the max-ack-delay configuration
2694 - A bug was fixed where the length of a hostname was miscalculated, so that
2695 hosts were given odd-looking domain names ("foo.bar.ba.example.com").
2697 - Shared network selection should be done from the innermost relay
2698 valid link-address field, rather than the outermost.
2700 - Prefix pools are attached to shared network scopes.
2702 - Merged IA_XX related structures.
2704 - Add DHCPv6 files in configure.
2706 - A memory leak when using omapi has been fixed.
2708 - DHCPv6 vendor-class options (VSIO) are now only sent when they appear
2709 on the DHCPv6 ORO. This resolves a bug where VSIO options were placed
2710 in IA_NA encapsulated options fields.
2712 - Integrated client with stateless, temporary address and prefix delegation
2715 - A double-dereference in dhclient transmission of DHCPDECLINEs was
2718 - Fix handling of format code 'Z'.
2720 - Support "-1" argument in DHCPv6.
2722 - Merge DHCPv6-only "dhcrelay6" into general-purpose "dhcrelay" (use
2723 "-6" option to select DHCPv6 mode).
2725 - Fix handling of -A and -a flags in dhcrelay; it was failing to expand
2726 packet size as needed to add relay agent options.
2728 - A bug in subnet6 parsing where options contained in subnet6 clauses would
2729 not be applied to clients addressed within that network was repaired.
2731 - When configuring a "subnet {}" or "subnet6 {}" without an explicit
2732 shared-network enclosing it, the DHCP software would synthesize a
2733 shared-network to contain the subnet. However, all configuration
2734 parameters within the subnet more intuitively belong "to any client
2735 on that interface", or rather the synthesized shared-network. So,
2736 when a shared-network is synthesized, it is used to contain the
2737 configuration present inside the subnet {} clause. This means that
2738 the configuration will be valid for all clients on that network, not
2739 just those addressed out of the stated subnet. If you intended the
2740 opposite, the workaround is to explicitly configure an empty
2743 - A bug was fixed where Information-Request processing was not sourcing
2744 configured option values.
2746 - A warning was added since the DHCPv6 processing software does not yet
2747 support class statements.
2749 - Compilation warnings on GCC 4.3 relating to bootp source address
2750 selection were repaired.
2752 - The v6 BSD socket method was updated to use a single UDP BSD socket
2753 no matter how many interfaces are involved, differentiating the
2754 interfaces the packets were received on by the interface index supplied
2757 - The relay agent no longer listens to the All DHCP Servers Multicast
2760 - A bug was fixed in data_string_sprintfa() where va_start was only called
2761 once for two invocations of vsprintf() variants.
2763 - ERO (RFC 4994) server support.
2765 - Basic and partial DHCPv6 leasequery support.
2767 - Reliable DHCPv6 release (previous behavior, send release and exit, is
2768 still available with dhclient -6 -1 -r).
2770 Changes since 4.0.0 (new features)
2772 - Added DHCPv6 rapid commit support.
2774 - Added explicit parser support for zero-length DHCP options, such as
2775 rapid-commit, via format code 'Z'.
2777 - It's now possible to update the "ends" field of a lease with OMAPI.
2778 This is useful if you want not only to release a lease, but also make
2779 it available for reuse right away. Hat tip to Christof Chen.
2781 - Fixed definition of the iaaddr hash functions to use the correct
2782 functions when referencing and dereferencing memory.
2784 - Some definitions not in phase with the IANA registry were updated.
2786 - Allocated interface IDs are better controlled ('u' bit set to zero,
2787 reserved IDs avoided).
2789 - Unicast options are taken into account only for RENEWs.
2791 - NoAddrsAvail answers to SOLICITs are always ADVERTISEs even when a SOLICIT
2792 carries a rapid-commit option.
2794 - Return in place of raise an impossible condition when one tries to release
2795 an empty active lease.
2797 - Timer granularity is now 1/100s in the DHCPv6 client.
2799 - The dhclient-script was updated to create a host route for the default
2800 gateway if the supplied subnet mask for an IPv4 address was a /32. This
2801 allows the client to work in 'captive' network environments, where the
2802 operator does not want clients to crosstalk directly.
2804 - MINUS tokens should be parsable again.
2806 - Multiple (up to "delayed-ack x;" maximum) DHCPv4 packets are now queued and
2807 released in bursts after single fsync() events when the upper limit is
2808 reached or if the receiving sockets go dry. The practical upshot is
2809 that fsync-coupled server performance is now multiplicitively increased.
2810 The default delayed ack limit is 28. Thanks entirely to a patch from
2813 Changes since 4.0.0 (bug fixes)
2815 - DHCP now builds on AIX.
2817 - Exit with warning when DHCPv6-specific statements are used in the
2818 config file but -6 is not specified.
2820 - Fixed "--version" flag in dhcrelay
2822 - The 'min-secs' configuration parameter's log message has been updated to
2825 - The warning logged when an address range doesn't fit in the subnets
2826 they were declared has been updated to be more helpful and identify the
2827 typo in configuration that created the spanning addresses.
2829 - A bug in failover pool rebalancing that caused POOLREQ message ping-pongs
2832 - A flaw in failover pool rebalancing that could cause POOLREQ messages to
2833 be sent outside of the min-balance/max-balance scheduled intervals has
2836 - A cosmetic bug during potential-conflict recovery that caused the peer's
2837 'conflict-done' state message to be logged as 'unknown-state' has been
2838 repaired. It is now logged correctly.
2840 - A bug was fixed where the 'giaddr' may be used to find the client's subnet
2841 rather than its own 'ciaddr'.
2843 - A log message was introduced to clarify the situation where a failover
2844 'address' parameter (the server's local address) did not resolve to an
2847 - The minimum site code value was set to 224 in 3.1.0 to track RFC3942. This
2848 broke a lot of legacy site local configurations. The new code in place will
2849 track site local space minimum option codes and logs a warning to encourage
2850 updates and exploration of site local code migration problems. Option
2851 codes less than 128 in site local spaces remain inaccessible.
2853 - A possible relay agent option bug was repaired where random server
2854 initialization state may have been used to signal the relay agent
2855 information options sub-option code for the 'END' of the option space.
2857 - Fixes to allow code to compile and run on Solaris 9.
2859 - Fixes to allow code to compile on Mac OS X Leopard (10.5).
2861 - When server is configured with options that it overrides, a warning is
2862 issued when the configuration file is read, rather than at the time the
2863 option is overridden. This was important, because the warning was given
2864 every time the option was overridden, which could create a lot of
2865 unnecessary logging.
2867 - Fixed a compilation problems on platforms that define a value for FDDI,
2868 which conflicts with a dhcp configuration syntax token by the same name.
2870 - When a failover server suspects it has encountered a peer running a
2871 version 3.0.x failover server, a warning that the failover wire protocol
2872 is incompatible is printed.
2874 - The failover server no longer issues a floating point error if it encounters
2875 a previously undefined option code.
2877 - Fix startup error messages to report a missing "subnet6 declaration", rather
2878 than a missing "subnet declaration", when running as a DHCPv6 server.
2880 - DHCPv6 client timestamp in DUID was based on the year 1970 rather
2883 - Warn when attempting to use a hardware parameter in DHCPv6.
2885 - DHCPv6 released resources are now marked as released by the client.
2887 - 'Soft' bindings have no more side-effects.
2889 Changes since 4.0.0b3
2891 - The reverse dns name for PTR updates on IPv6 addresses has been fixed to
2892 use ip6.arpa. rather than default to in-addr.arpa and require user
2895 - dhc6_lease_destroy() and dhc6_ia_destroy() now set lease and IA pointers
2896 to NULL after freeing, to prevent subsequent accesses to freed memory.
2898 - The DHCPv6 server would not send the preference option unless the
2899 client requested it, via the ORO. This has been fixed, so the DHCPv6
2900 server will always send the preference value if it is configured.
2902 - When addresses were passed as hints to the server in an IA, they were
2903 incorrectly handled, sometimes being treated as an error. Now the
2904 server will treat these as hints and ignore them if it cannot supply
2905 a requested address.
2907 - If the client had multiple addresses, and one expired (was not renewed
2908 by the server), the client would continue to attempt to renew the same
2909 old address over and over. Now, the client will omit any expired
2910 addresses from future Confirm, Renew, or Rebind messages.
2912 - dhclient -6 will now select renew/rebind timers based upon the longest
2913 address expiration time rather than the shortest expiration time, in
2914 order to avoid cascading renewals in the event a server elects not to
2915 extend one of multiple IAADDR leases.
2917 - The server now limits clients that request multiple addresses to one
2918 address per IA by default, which can be adjusted through the
2919 "limit-addrs-per-ia" configuration option.
2921 - The DHCPv6 client now issues fresh transaction IDs on Renew and Rebind
2922 message exchanges, rather than using the most recent ID.
2924 - The DHCPv6 server now replies to Information-Request messages.
2926 - A bug was fixed in the dhclient-script for BSDs to correctly carry error
2927 codes through some conditions.
2929 - The parsing of some options in the dhclient lease file, in particular
2930 the success DHCPv6 status-code, was fixed.
2932 - A bug was fixed that caused the DHCPv6 ORO option to be corrupted with
2933 seemingly random values.
2935 - A reference overleak in DHCPv6 shared network processing was repaired.
2937 - ./configure now autodetects local database locations rather than trying
2938 to put dhcpd.leases and dhclient.leases in /usr/local/var/db, which no
2941 - Regression fix for bug where server advertised a IPv6 address in
2942 response to a SOLICIT but would not return the address in response
2945 - A bug was fixed where the DHCPv6 server puts the NoAddrsAvail status
2946 code in the IA_NA was fixed. The status code now appears in the root
2949 Changes since 4.0.0b2
2951 - Clarified error message when lease limit exceeded
2953 - Relative time may now be used as a qualifier for 'allow' and 'deny' access
2954 control lists. These directives may be used to assist in re-addressing
2955 address pools without having to constantly reconfigure the server. Please
2956 see 'man dhcpd.conf' for more information on allow/deny 'after time' syntax.
2957 Thanks to a patch from Christof Chen.
2959 - The server will now include multiple IA_NA's and multiple IAADDRs within
2960 them, if advertised by the client. It still only seeks to allocate one
2963 Changes since 4.0.0b1
2965 - Use different paths for PID and lease files when running in DHCPv4
2966 or DHCPv6 mode, so that servers for both protocols can be run
2967 simultaneously on a single interface.
2969 - Fixed a buffer overflow error which could have allowed a denial
2970 of service under unusual server configurations
2972 - Eliminated a spurious error message from the client
2974 - A number of bugs with the internal handling of lease state on the
2975 server have been fixed. Some of these could cause server crashes.
2977 - The peer_wants_leases() changes pulled up from 3.1.0 were corrected,
2978 'never used' leases will no longer consistently shift between servers
2979 on every pool rebalance run.
2981 - sendmsg()/recvmsg() control buffers are now declared in such a way to
2982 ensure they are correctly aligned on all (esp. 64-bit) architectures.
2984 - The client leasing subsystem was streamlined and corrected to account
2985 more closely for changes in client link attachment selection.
2987 Changes since 4.0.0a3
2989 - The DHCP server no longer requires a "ddns-update-style" statement,
2990 and now defaults to "none", which means DNS updates are disabled.
2992 - Log messages when failover peer names mismatch have been improved to
2993 point out the problem.
2995 - Bug where server advertised a IPv6 address in response to a SOLICIT
2996 but would not return the address in response to a REQUEST. Thanks to
2997 Dennis Kou for finding the bug.
2999 - Fixed an error causing the server to lock up on lease expiration,
3000 reported independently by Jothilingam Vasu and Dennis Kou.
3002 - Fixed a ./configure bug where compile tests were failing due to
3003 "-Werror" (unused variable) rather than the actual test failure. Lead
3004 to inconsistent and unworkable auto-configurations.
3006 - Compilation with DLPI and -Werror has been repaired.
3008 - Error in decoding IA_NA option if multiple interfaces are present
3009 fixed by Marcus Goller.
3011 - DHCPv6 server Confirm message processing has been enhanced - it no
3012 longer replies only to clients with host {} records, it now replies
3013 as directed in RFC3315 section 18.2.2 - that is, to all clients
3014 regardless of the existence of bindings.
3016 - A core dump during expired lease cleanup has been repaired.
3018 - DDNS updates state information are now stored in 'binding scopes' that
3019 follow the leases through their lifecycles. This enables DDNS teardowns
3020 on leases that are assigned and expired inbetween a server restart (the
3021 state is recovered from dhcpd.leases). Arbitrary user-specified binding
3022 scopes ('set var = "value";') are not yet supported.
3024 - Additional compilation problems on HP/UX have been repaired.
3026 Changes since 4.0.0a2
3028 - Fix for startup where there are no IPv4 addresses on an interface.
3029 Thanks to Marcus Goller for reporting the bug.
3031 - Fixed file descriptor leak on listen failure. Thanks to Tom Clark.
3033 - Bug in server configuration parser caused server to get stuck on
3034 startup for certain bad pool declarations. Thanks to Guillaume
3035 Knispel for the bug report and fix.
3037 - Code cleaned to remove warnings reported by "gcc -Wall".
3039 - DHCPv6 is now the default. You can disable DHCPv6 support using the
3040 "--disable-dhcpv6" flag when you run the configure script.
3042 - An internal database inconsistency bug was repaired where the server
3043 would segfault if a client attempted to renew a lease that had been
3044 loaded from persistent storage.
3046 - 'request' and 'also request' syntaxes have been added to accommodate
3047 the DHCPv6 client configuration. 'send dhcp6.oro' is no longer
3050 - Bug fixed where configuration file parsing did not work with
3051 zero-length options; this made it impossible to set the
3052 rapid-commit option.
3054 - Bogus messages about host records with IPv4 fixed-addresses being of
3055 non-128-bits in length were removed.
3057 Changes since 4.0.0a1
3059 - Bug in octal parsing fixed. Thanks to Bernd Fuhrmann for the report
3062 - Autoconf now supplies proper flags for Solaris DHCPv6 builds.
3064 - Fix for parsing error on some IPv6 addresses.
3066 - Invalid CIDR representation for IPv6 subnets or ranges now checked
3067 for when loading configuration.
3069 - Compilation on HP/UX has been repaired. The changes should generally
3070 apply to any architecture that supplies SIOCGLIFCONF but does not
3071 use 'struct lifconf' structures to pass values.
3073 - Two new operators, ~= and ~~, have been integrated to implement
3074 boolean matches by regular expression (such as may be used in
3075 class matching statements). Thanks to a patch by Alexandr S.
3076 Agranovsky, which underwent slight modification.
3078 - Fix for icmp packets on 64-bit systems (bug introduced in 4.0).
3080 - A bug was fixed in interface discovery wherein an error identifying
3081 a server-configured interface with no IPv4 addresses would SEGV.
3083 - Fixed a bug in which write_lease() might report a failure incorrectly
3085 - Added support for DHCPv6 Release messages
3087 - Added -x option to dhclient, which triggers dhclient processes
3088 to exit gracefully without releasing leases first
3090 - All binaries (client, server, relay) now change directories
3091 to / before going into daemon mode, so as not to hold $CWD open
3093 - Fixed a bug parsing DHCPv6 client-id's in host-identifier statements
3095 - Fixed a bug with the 'ddns-updates' boolean server configuration
3096 parameter, which caused the server to fail.
3098 Changes since 4.0.0-20070413
3100 - Old (expired) leases are now cleaned.
3102 - IPv6 subnets now have support for arbitrary allocation ranges via
3103 a new 'range6' configuration directive.
3105 - An obviated option code hash lookup to find D6O_CLIENTID was removed.
3107 - Corrected some situations where variables might be used without being
3110 - Silenced several other compiler warnings.
3112 - Include the more standard sys/uio.h rather than rely upon other
3113 header files to include it (fixes a BSD 4.2 compile failure).
3115 - Duplicate dhclient-script updates for DHCPv6 to all provided scripts.
3117 - DHCPv4 I/O methods that failed to sense hardware address were corrected.
3119 - DHCPv4 is now the default (as documented) rather than DHCPv6. The default
3120 was set to DHCPv6 to facilitate ease early development, and forgotten.
3122 - Corrected a segmentation violation in DHCPv4 socket processing.
3124 - dhclient will now fork() into the background once it binds to an
3125 IPv6 address, or immediately if the -n flag is supplied.
3127 - -q is now the default behaviour on dhclient, with -d or -v enabling
3128 non-quiet (stderr logging) mode.
3130 - Fix documentation of the domain-search atom (quoted, with commas).
3132 - Document DHCPv6 options presently in the default table.
3134 - Replaced ./configure shellscripting with GNU Autoconf.
3136 Changes since 3.1.0 (NEW FEATURES)
3138 - DHCPv6 Client and Server protocol support. Use '-6' to run the daemons
3139 as v6-only. Use '-4' to run the daemons as v4-only (default. There is
3140 no support currently for both.
3142 - Server support for multiple IA_NA options, containing at most one
3145 - Client support for one IA_NA option, containing any number of IAADDR
3148 - Server support for the DHCPv6 Information-request message.
3150 - Inappropriate unicast DHCPv6 messages sent to the server are now
3151 discarded, and this has rearchitected the IO system slightly.
3153 - The DHCPv6 server DUID defaults to type 1, is persistently stored in
3154 the leases database, and can be over-ridden (either completely, or by
3155 specifying type 1 or type 2).
3157 - The server only uses Rapid-Commit if it has been configured with the
3158 Rapid-Commit option and the client requests it.
3160 - DDNS support. We now update AAAA records in the same place we would
3161 update A records, if we have an IPv6 address. We also generate IP6.ARPA
3162 style names for PTR records if we're dealing with an IPv6 address. Both
3163 A and AAAA updates are done using the same 'fqdn.' virtual option space
3164 (although the DHCPv4 FQDN and DHCPv6 FQDN options are formatted
3165 differently, they both use the same code here).
3167 - The Linux dhclient-script attempts to set and remove assigned addresses,
3168 and to configure /etc/resolv.conf from nameserver and domain name
3169 configurations. It can be extended to configure other parameters.
3171 - Initial DHCPv6 lease support.
3173 - The IO system now tracks all local IP addresses, so that the DHCP
3174 applications (particularly the dhcrelay) can discern between what frames
3175 were transmitted to it, and what frames are being carried through it which
3176 it should not intercept.
3178 Changes since 3.1.0 (Maintenance)
3180 - A bug was repaired where MAC Address Affinity for virgin leases always
3181 mapped to the primary. Virgin leases now have an interleaved preference
3182 between primary and secondary.
3184 - A bug was repaired where MAC Address Affinity for clients with no client
3185 identifier was sometimes mishashed to the peer. Load balancing during
3186 runtime and pool rebalancing were opposing.
3188 - An assertion in lease counting relating to reserved leases was repaired.
3190 - The subnet-mask option inclusion now conforms with RFC2132 section 3.3;
3191 it will only appear prior to the routers option if it is present on the
3192 Parameter-Request-List. The subnet-mask option will also only be
3193 included by default (if it is not on the PRL) in response to DISCOVER
3194 or REQUEST messages.
3196 - The FQDN option is only supplied if the client supplied an FQDN option or
3197 if the FQDN option was explicitly requested on the PRL.
3199 - Dynamic BOOTP leases are now load balanced in failover.
3201 Changes since 3.1.0rc1
3203 - The parse warning that 'deny dynamic bootp;' must be configured for
3204 failover protected subnets was removed.
3206 Changes since 3.1.0b2
3208 - Failover rebalance events no longer play ping pong with round errors
3209 (moving leases between free and back to backup where there are an
3210 odd number of leases).
3212 - The 'pool' log line has been split into two messages, one before the
3213 rebalance run, and one after.
3215 - Any queued BNDACKs are transmitted before transmitting new BNDUPDs.
3216 This enforces the correct sequence of events for the remote server
3217 processing these messages.
3219 Changes since 3.1.0b1
3221 - Fixed a bug that caused OMAPI clients to freeze when opening lease
3224 - A new server config option "fqdn-reply" specifies whether the server
3225 should send out option 81 (FQDN). Defaults to "on". If set to "off",
3226 the FQDN option is not sent, even if the client requested it. This is
3227 needed because some clients misbehave otherwise. Thanks to Christof Chen
3230 - Allow trace output files (-tf option) to be overwritten, rather than
3231 crashing dhcpd if the file already exists
3233 - A bug was fixed that caused dhcpd to segfault if a pool was declared
3234 outside the scope of a subnet in dhcpd.conf.
3236 - Some uninitialized values were repaired in dhcpleasequery.c that
3237 caused the server to abort.
3239 - A new server config option, 'do-reverse-updates', has been added
3240 which causes the server to abstain from performing updates on PTR
3241 records. Thanks to a patch from Christof Chen at Allianz.
3243 - A bug was repaired in subencapsulation support, where spaces separated
3244 by empty spaces would not get included.
3246 - A bug in dhclient was repaired which caused it to send parameter request
3247 lists of 55 bytes in length no matter how long the declared PRL was.
3249 - 'dhcp.c(3953): non-null pointer' has been repaired. This fixes a flaw
3250 wherein the DHCPv4 server may ignore a configured server-identifier.
3252 - A flaw in failover startup sequences was repaired that sometimes left
3253 the primary DHCP server's pool rebalance schedules unscheduled.
3255 - Corrected a flaw that broke encapsulated spaces included due to presence
3256 on the parameter request list.
3258 Changes since 3.1.0a3
3260 - Some spelling fixes.
3262 Changes since 3.1.0a2
3264 - A bug was fixed where attempting to permit leasequeries results in a
3265 fatal internal error, "Unable to find server option 49".
3267 - A bug was fixed in dhclient rendering the textual output form of the
3268 domain-search option syntax.
3270 Changes since 3.1.0a1
3272 - A bug in the FQDN universe that added FQDN codes to the NWIP universe's
3273 hash table was repaired.
3275 - The servers now try harder to transmit pending binding updates when
3276 entering normal state.
3278 - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
3279 requeues all pending updates. This should reduce the number of spurious
3280 'xid mismatch' log messages.
3282 - An option definition referencing leak was fixed, which resulted in early
3283 termination of dhclient upon the renewal event.
3285 - Some default hash table sizes were tweaked, some upwards, some downwards.
3286 3.1.0a1's tables resulted in a reduction in default server memory use.
3287 The new selected values provide more of a zero sum (increasing the size
3288 of tables likely to be populated, decreasing the size of tables unlikely).
3290 - Lease structures appear in three separate hashes: by IP address, by UID,
3291 and by hardware address. One type of table was used for all three, and
3292 improvements to IP address hashing were applied to all three (so UID and
3293 hardware addresses were treated like 4-byte integers). There are now two
3294 types of tables, and the uid/hw hashes use functions more appropriate
3297 - The max-lease-misbalance percentage no longer causes scheduled rebalance
3298 runs to be skipped: it still governs the schedule, but every scheduled
3299 run will attempt balance.
3301 - A segfault bug in recursive encapsulation support has been corrected.
3303 Changes since 3.0 (New Features)
3305 - A workaround for certain STSN servers that send a mangled domain-name
3306 option was introduced for dhclient. The client will now accept corrupted
3307 server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
3308 or NAK). The server will continue to not accept corrupt client packets.
3310 - Support for 'reserved' (pseudo-static) and BOOTP leases via failover
3313 - Support for adding, removing, and managing class and subclass statements
3316 - The failover implementation was updated to comply with revision 12 of
3319 - 'make install' now creates the initial zero-length dhcpd.leases file if
3320 one does not already exist on the system.
3322 - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
3324 - The Load Balance Algorithm was misimplemented. The current implementation
3327 - lcase() and ucase() configuration expressions have been added which adjust
3328 their arguments from upper to lower and lower to upper cases respectively.
3329 Thanks to a patch from Albert Herranz.
3331 - The dhclient 'reject ...;' statement, which rejects leases given by named
3332 server-identifiers, now permits address ranges to be specified in CIDR
3333 notation. Thanks to a patch from David Boyce.
3335 - The subnet-mask option is now supplied by default, but at lowest
3336 priority. This helps a small minority of clients that provide parameter
3337 request lists, but do not list the subnet-mask option because they were
3338 designed to interoperate with a server that behaves in this manner.
3340 - The FQDN option is similarly supplied even if it does not appear on the
3341 parameter request list, but not to the exclusion of options that do
3342 appear at the parameter request list. Up until now it had ultimate
3343 priority over the client's parameter request list.
3345 - Varying option space code and length bit widths (8/16/32) are now
3346 supported. This is a milestone in achieving RFC 3925 "VIVSO" and
3349 - A new common (server or client) option, 'db-time-format local;', has
3350 been added which prints the local time in /var/db/dhcpd.leases rather
3351 than UTC. Thanks to a patch from Ken Lalonde.
3353 - Some patches to improve DHCP Server startup speed from Andrew Matheson
3354 have been incorporated.
3356 - Failover pairs now implement 'MAC Affinity' on leases moving from the
3357 active to free states. Leases that belonged to the failover secondary
3358 are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
3359 If lease rebalancing must move leases, it tries first to move leases
3360 that belong to the peer in need.
3362 - The server no longer sends POOLREQ messages unless the pool is severely
3363 misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
3365 - Pool rebalance events no longer happen upon successfully allocating a
3366 lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
3367 min-balance and max-balance statements for more information.
3369 - The DHCP Relay Agent Information Option / Link Selection Sub-Option
3370 is now supported. (See RFC3527 for details).
3372 - A new DDNS related server option, update-conflict-detection, has been
3373 added. If this option is enabled, dhcpd will perform normal DHCID
3374 conflict resolution (the default). If this option is disabled, it will
3375 instead trust the assigned name implicitly (removing any other bindings
3376 on that name). This option has not been made available in dhclient.
3378 - In those cases where the DHCP software manufactures an IP header (to
3379 transmit via bpf, lpf, etc), the IP TTL the software selects has been
3380 increased from 16 to 128. This is intended to match Microsoft Windows
3381 DHCP Client behaviour, to increase compatibility.
3383 - 'ignore client-updates;' now has behaviour that is different from
3384 'deny client-updates;'. The client's request is not truly ignored,
3385 rather it is encouraged. Should this value be configured, the server
3386 updates DNS as though client-updates were set to 'deny'. That is, it
3387 enters into DNS whatever it is configured to do already, provided it is
3388 configured to. Then it sends a response to the client that lets the
3389 client believe it is performing client updates (which it will), probably
3390 for a different name. In essence, this lets the client do as it will,
3391 ignoring this aspect of their request.
3393 - Support for compressed 'domain name list' style DHCP option contents, and
3394 in particular the domain search option (#119) was added.
3396 - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
3397 LEASEQUERY lets you query the DHCP server for information about a lease,
3398 using either an IP address, MAC address, or client identifier. Thanks
3399 to a patch from Justin Haddad.
3401 - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
3402 ethernet mac address) on the SCO platform specifically without any strange
3403 ifconfig hacks. Many thanks go to the Kroger Co. for donating the
3404 hardware and funding the development.
3406 - A new common configuration executable statement, execute(), has been
3407 added. This permits dhcpd or dhclient to execute a named external
3408 program with command line arguments specified from other configuration
3409 language. Thanks to a patch written by Mattias Ronnblom, gotten to us
3412 - A new dhcp server option 'adaptive-lease-time-threshold' has been added
3413 which causes the server to substantially reduce lease-times if there are
3414 few (configured percentage) remaining leases. Thanks to a patch submitted
3417 - Encapsulated option spaces within encapsulated option spaces is now
3420 Changes since 3.0.6rc1
3422 - supersede_lease() now requeues leases in their respective hardware
3423 address hash bucket. This mirrors client identifier behaviour.
3427 - Assorted fixes for broken network devices: Packet length is now
3428 determined from the IP header length field to finally calculate the
3429 UDP payload length, because some NIC drivers return more data than
3430 they actually received.
3432 - UDP packets are now stored in aligned data structures.
3434 - A logic error in omapi interface code was repaired that might result in
3435 incorrectly indicating 'up' state when any flags were set, rather than
3436 specifically the INTERFACE_REQUESTED flag. Thanks to a patch from
3437 Jochen Voss which got to us via Andrew Pollock at Debian.
3439 - A reference leak on binding scopes set by ddns updates was repaired.
3441 - A memory leak in the minires_nsendsigned() function call was repaired.
3442 Effectively, this leaked ~176 bytes per DDNS update.
3444 - In the case where an "L2" DHCP Relay Agent (one that does not set giaddr)
3445 was directly attached to the same broadcast domain as the DHCP server,
3446 the RFC3046 relay agent information option was not being returned to the
3447 relay in the server's replies. This was fixed; the dhcp server no longer
3448 requires the giaddr to reply with relay agent information. Note that
3449 this also improves compatibility with L2 devices that "intercept" DHCP
3450 packets and expect relay agent information even in unicast (renewal)
3451 replies. Thanks to a patch from Pekka Silvonen.
3453 - A bug was fixed where the BOOTP header 'sname' field had a value, the
3454 copy written to persistent storage was actually the contents of the
3457 - A bug was fixed where the nwip virtual option space was referencing
3458 the fqdn option's virtual option space's option cache.
3460 - Timestamp parsing errors that indicated missing "minutes" fields rather
3461 than the actually missing "seconds" fields have been repaired thanks to
3462 a patch from Kevin Steves.
3464 - A grammar error in the dhclient.8 manpage was repaired thanks to a patch
3467 - Several spelling typos were repaired, and some cross-references to other
3468 relevant documents were included in the manpages, thanks to a patch
3469 by Andrew Pollock which got to us via Tomas Pospisek.
3471 - Some bugs were fixed in the 'emergency relay agent options hologram'
3472 which is used to retain relay agent option contents from when the
3473 client was in INIT or REBIND states. This should solve problems where
3474 relay agent options were not echoed from the server, even when giaddr
3477 - dhclient now closes its descriptor to dhclient.leases prior to executing
3478 dhclient-script. Thanks to a patch from Tomas Pospisek.
3480 - The server's "by client-id" and "by hardware address" hash table lists
3481 are now sorted according to the preference to re-allocate that lease to
3482 returning clients. This should eliminate pool starvation problems
3483 arising when "INIT" clients were given new leases rather than presently
3486 Changes since 3.0.5rc1
3488 - A bug was repaired in fixes to the dhclient, which sought to run the
3489 dhclient-script with the 'EXPIRE' state should it receive a NAK in
3490 response to a REQUEST. The client now iterates the PREINIT state
3491 after the EXPIRE state, so that interfaces that might be configured
3492 'down' can be brought back 'up' and initialized.
3494 - DHCPINFORM handling for clients that properly set ciaddr and come to the
3495 server via a relay aget has been repaired.
3499 - A warning that host statements declared within subnet or shared-network
3500 scopes are actually global has been added.
3502 - The default minimum lease time (if min-lease-time was not specified)
3503 was raised from 0 to 300. 0 is not thought to be sensible, and is
3504 known to be damaging.
3506 - Added additional fatal error sanity checks surrounding lease binding
3507 state count calculations (free/active counts used for failover pool
3510 - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
3511 misapplied to server values rather than client values. The server no longer
3512 advertises 8-byte lease-time options when on 64-bit platforms.
3514 - A bug where leases not in ACTIVE state would get billed to billed classes
3515 (classes with lease limitations) was fixed. Non-active leases OFFERed
3516 to clients are no longer billed (but billing is checked before offering).
3518 - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
3519 configuration option - the default configuration and results should be
3522 - If the dhclient were to receive a DHCPNAK while it was in the RENEW
3523 state (and consequently, had an active, 'bound' address and related
3524 configuration options), it would fail to 'tear down' this information
3525 before proceeding into INIT state. dhclient now iterates the dhclient-
3526 script with the 'EXPIRE' action to cause these teardowns prior to entering
3527 INIT state. Thanks to a patch from Chris Zimmerman.
3529 - The omapi.1 manpage had some formatting errors repaired thanks to a patch
3530 from Yoshihiko Sarumaru.
3532 - A few lines of code that were failover-specific were moved within
3533 #if defined() clauses so that compilation without failover could be
3536 - The log message emitted when the 'leased-address' value was not available
3537 in dhcpd.conf "executable statements" has been updated to be more helpful.
3538 Manpage information for this value has also been updated.
3540 - Abandoned or dissociated (err condition) leases now remove any related
3541 dynamic dns bindings. Thanks to a patch from Patrick Schoo.
3543 - Attempting to write a new lease file to replace a corrupt (due to
3544 encountering non-retryable errors during writing) lease file should
3545 no longer result in an infinite recursion.
3547 - Host declaration hardware addresses and client identifiers may only be
3548 configured once. dhcpd will now fail to load config files that specify
3549 multiple identifiers (previous versions would silently over-ride the
3550 value with the later configured value).
3552 - Several option codes that have been allocated since our last release
3553 have been named and documented.
3555 - Option names of the form "unknown-123" have been removed from the in-
3556 memory hash tables. In order to support options of these names that
3557 may appear in dhclient.leases or similar in previous versions, the
3558 parser will now find the new option code definition, or mock up a
3559 generic option code definition. This should result in a smooth
3560 transition from one name to the other, as the new name is used to
3563 Changes since 3.0.4rc1
3565 - The dhcp-options.5 manpage was updated to correct indentation errors
3566 thanks to a patch from Jean Delvare.
3568 Changes since 3.0.4b3
3570 - Some manual pages were clarified pursuant to discussion on the dhcp-server
3573 Changes since 3.0.4b2
3575 - Null-termination sensing for certain clients that unfortunately require
3576 it in DHCPINFORM processing was repaired.
3578 - The host-name option and a few others were moved from "X" format to "t"
3579 format to be compatible with new NULL handling functions.
3581 - DHCPINFORM processing is a little more careful about return addressing
3582 its responses, or if responding via a relay. The INFORM related
3583 messages also log the 'effective client ip address' rather than the
3584 client's supplied ciaddr (since some clients produce null ciaddrs).
3586 - The server was inappropriately sending leases to the RESET state in the
3587 event that multiple active leases were found to match a singly-identified
3588 client. This was changed to RELEASED (by accepting a different, ACTIVE
3589 binding, the client is implicitly releasing its lease). This repairs a
3590 bug wherein secondary servers in failover pairs detecting this condition
3591 move leases to RESET, and primaries refuse to accept that state
3592 transition (properly).
3594 - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
3596 Changes since 3.0.4b1
3598 - Command line parsing in omshell was repaired - it no longer closes
3599 STDIN after reading one line.
3601 - The resolver library no longer closes the /etc/resolv.conf file
3602 descriptor it opened twice.
3604 - Changes to trailing NULL removal in 't' option-atoms has been rethought,
3605 it now includes 'd' (domain name) types, and tries hard not to rewind an
3606 option beyond the start of the text field it is un-terminating.
3610 - A DDNS update handling function was misusing the DNS error codes, rather
3611 than the internal generic result enumeration. The result is a confusing
3612 syslog line, logging the wrong condition.
3614 - The DHCP Server was not checking pool balance in the case where it brought
3615 a non-ACTIVE lease out of storage for a client that was returning to use
3616 a lease it once had long ago, and had since expired.
3618 - Failover peers no longer bother to look for free leases to allocate when
3619 they already found the client's ACTIVE lease. DISCOVERs are load balanced
3620 whether freely-allocated or not, unless the server doubts the peer has
3623 - Fixed a bug in dhcrelay agent addition code that suppressed trailing
3624 PAD options - it was suppressing only one trailing PAD option, rather
3625 than the entire block of them.
3627 ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
3628 option addition and stripping code. Added a few sanity checks. Although
3629 highly improbable, due to requiring the reception of a DHCP datagram well
3630 in excess of all known to be used physical MTU limitations, it is possible
3631 this may have been used in a stack overflow security vulnerability. Thanks
3632 to a patch from infamous42md.
3634 ! Added some sanity checks to OMAPI connection/authentication code.
3635 Although highly improbable, due to having to deliver in excess of 2^32
3636 bytes of data via the OMAPI channel, not to mention requiring dhcpd to
3637 be able to malloc() a memory region 2^32 bytes in size, it was possible
3638 this might have resulted in a heap overflow security vulnerability.
3639 Thanks to a patch from infamous42md.
3641 - dmalloc() memset()'s the non-debug (data) portion of the allocated
3642 memory to zero. Code that memset()'s the result returned by dmalloc() to
3643 zero is redundant. These redundancies were removed.
3645 - Some type declaration corrections to u_int16_t were made in common/tr.c
3646 (Token Ring support) thanks to a patch from Jason Vas Dias at Red Hat.
3648 - A failover bug that was allowing leases that EXPIRED or were RELEASED
3649 where tsfp and tstp are identical timestamps to languish in these
3650 transitional states has been repaired. As a side effect, lease
3651 databases should be kept more consistent overall, not just for these
3652 transitional states.
3654 - If the lease db is deleted out from under the daemon, and it moves to rewrite
3655 the db, it will go ahead with the operation and move the new db into place
3656 once it detects the old db does not exist.
3658 - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
3659 is either nonsensical or (in the case of IEEE1394) is not known to support
3660 these interfaces. Thanks to Marius Gedminas and Andrew Pollock of Debian.
3662 - Some previously undocumented reasons for dhclient-script invoking has
3663 been documented in the dhclient-script.8 manpage.
3665 - Failover potential expiry calculations (TSTP) have been corrected. Results
3666 should be substantially more consistent, and proper given the constraints.
3668 - Adjusted lease state validation checks in potential-conflict, to
3669 account for possible clock skew similarly to normal state, and several
3670 previously illegal transitions were made legal (ex: active->released).
3672 - An impossible sanity check was removed from omapi/buffer.c, thanks to a
3673 patch from 'infamous42md'.
3675 - An OMAPI host/network byte order problem in lease time values has been
3678 - Several minor bugs, largely relating to treating 8-byte time values as
3679 4-byte entities, have been repaired after careful review of the FreeBSD
3680 ports collection's patch set. Thanks to the nameless entities who have
3681 contributed to the FreeBSD ports.
3683 - When writing a trace file, the file is now created with permissions 0600,
3684 to help administrators avoid accidentally publicising sensitive config
3687 - The calculation of the maximum size of DHCP packets no longer includes
3688 Ethernet framing overhead. The result is that the 'Maximum Message
3689 Size' option advertised by clients, or the default value 576, is no
3690 longer reduced by 14 bytes, and instead directly reflects the IP level
3691 MTU (and the default, minimum allowed IP MTU of 576).
3693 - The special status of RELEASED/EXPIRED/RESET leases when a server
3694 is operating in partner-down was fixed. It no longer requires a
3695 lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
3696 event to turn these into FREE leases without peer acknowledgement
3697 (after STOS+MCLT) has been repaired.
3699 - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
3702 - "append"ing a string onto the end of a "t" type option (such as the
3703 domain-name field) that had been improperly NULL-terminated by the
3704 DHCP server will no longer result in a truncated string containing
3705 only the option from the server, and not the expected appended value.
3706 Thanks to a patch from Jason Vas Dias at Red Hat.
3708 - File handlers on configuration state (config files and lease dbs) should
3709 be treated consistently, regardless of whether TRACING is defined or not.
3711 - The Linux build environment has had some minor improvements - better
3712 sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
3713 and corrections to #if operators regarding LINUX_MAJOR should it ever
3716 - The server now tries harder to survive the condition where it is unable
3717 to open a new lease file to rewrite the lease state database.
3719 Changes since 3.0.3b3
3721 - dhclient.conf documentation for interface {} was updated to reflect recent
3722 discussion on the dhcp-hackers mailing list.
3724 - In response to reports that the software does not compile on GCC 4.0.0,
3725 -Werror was removed from Makefile.conf for all platforms that used it.
3726 We will address the true problem in a future release; this is a temporary
3729 Changes since 3.0.3b2
3731 - An error in code changes introduced in 3.0.3b2 was corrected, which caused
3732 static BOOTP clients to receive random addresses.
3734 Changes since 3.0.3b1
3736 - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
3737 host records would be left behind on leases that were not allocated to the
3738 client currently booting (eg in the case where the host was denied booting).
3740 - The dhcpd.conf.5 manpage was updated to be more clear in regards to
3741 multiple host declarations (thanks to Vincent McIntyre). 'Interim' style
3742 dynamic updates were also retouched.
3746 - A bug was fixed where a server might load balance a DHCP REQUEST to its
3747 peer after already choosing not to load balance the preceding DISCOVER.
3748 The peer cannot allocate the originating server's lease.
3750 - In the case where a secondary server lost its stable storage while the
3751 primary was still in communications-interrupted, and came back online,
3752 the lease databases would not be fully transferred to the secondary.
3753 This was due to the secondary errantly sending an extra UPDREQ message
3754 when the primary made its state transition to PARTNER-DOWN known.
3756 - The package will now compile cleanly in gcc 3.3 and 3.4. As a side effect,
3757 lease structures will be 9 bytes smaller on all platforms. Thanks to
3758 Jason Vas Dias at Red Hat.
3760 - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
3761 properly restricted to only detecting broadcast interfaces. Thanks
3762 to a patch from Jason Vas Dias at Red Hat.
3764 - decode_udp_ip_header was changed so that the IP address was copied out
3765 to a variable, rather than referenced by a pointer. This enforces 4-byte
3766 alignment of the 32-bit IP address value. Thanks to a patch from Dr.
3769 - An incorrect log message was corrected thanks to a patch from
3772 - A bug in DDNS was repaired, where if the server's first DDNS action was
3773 a DDNS removal rather than a DDNS update, the resolver library's
3774 retransmit timer and retry timer was set to the default, implying a
3775 15 second timeout interval. Which is a little excessive in a synchronous,
3776 single-threaded system. In all cases, ISC DHCP should now hold fast to
3777 a 1-second timeout, trying only once.
3779 - The siaddr field was being improperly set to the server-identifier when
3780 responding to DHCP messages. RFC2131 clarified the siaddr field as
3781 meaning the 'next server in the bootstrap process', eg a tftp server.
3782 The siaddr field is now left zeroed unless next-server is configured.
3784 - mockup_lease() could have returned in an error condition (or in the
3785 condition where no fixed-address was found matching the shared
3786 network) with stale references to a host record. This is probably not
3787 a memory leak since host records generally never die anyway.
3789 - A bug was repaired where failover servers would let stale client identifiers
3790 persist on leases that were reallocated to new clients not sending an id.
3792 - Binding scopes ("set var = value;") are now removed from leases allocated
3793 by failover peers if the lease had expired. This should help reduce the
3794 number of stale binding scopes on leases.
3796 - A small memory leak was closed involving client identifiers larger than
3797 7 bytes, and failover.
3799 - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
3800 cause an internal function to overflow heap. Thanks to Jason Vas Dias
3803 - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
3804 or 'NUMBER_OR_NAME' was repaired. Hexadecimal parsing is affected, and
3807 - In several cases, parse warnings were being issued before the lexical
3808 token had been advanced to the token whose value was causing an error...
3809 causing parse warnings to claim the problem is on the wrong token.
3811 - Host declarations matching on client identifier for dynamic leases will
3812 no longer match fixed-address host declarations (this is now identical
3813 to behaviour for host records matching on hardware address).
3815 Changes since 3.0.2rc3
3817 - A previously undocumented configuration directive, 'local-address',
3818 was documented in the dhcpd.conf manpage.
3820 Changes since 3.0.2rc2
3822 - Two variables introduced in 3.0.2b1 were used without being initialized
3823 in the case where neither the FILE nor SNAME fields were available for
3824 overloading. This was repaired.
3826 - A heretofore believed to be impossible corner case of the option
3827 overloading implementation turned out to be possible ("Unable to sort
3828 overloaded options after 10 tries."). The implementation was reworked
3829 to consider the case of an option so large it would require more than
3830 three chunks to fit.
3832 - Many other instances of variables being used without being initialized
3835 - An uninitialized variable in omapi_io_destroy() led to the discovery
3836 that this function may result in orphaned pointers (and hence, a memory
3839 Changes since 3.0.2rc1
3841 - allocate_lease() was rewritten to repair a bug in which the server would
3842 try to allocate an ABANDONED lease when FREE leases were available.
3844 Changes since 3.0.2b1
3846 - Some dhcp-eval.5 manpage formatting was repaired.
3850 - A bug was fixed in the server's 'option overloading' implementation,
3851 where options loaded into the 'file' and 'sname' packet fields were
3852 not aligned precisely as rfc2131 dictates.
3854 - The FreeBSD client script was changed to support the case where a domain
3855 name was not provided by the server.
3857 - A memory leak in 'omshell' per each command line parsed was
3858 repaired, thanks to a patch from Jarkko Torppa.
3860 - Log functions writing to stderr were adjusted to use the STDERR_FILENO
3861 system definition rather than '2'. This is a no-op for 90% of platforms.
3863 - One call to trace_write_packet_iov() counted the number of io vectors
3864 incorrectly, causing inconsistent tracefiles. This was fixed.
3866 - Some expression parse failure memory leaks were closed.
3868 - A host byte order problem in tracefiles was repaired.
3870 - Pools configured in DHCPD for failover possessing permission lists that
3871 previously were assumed to not include dynamic bootp clients are now
3872 a little more pessimistic. The result is, dhcpd will nag you about just
3873 about most pools that possess a 'allow' statement with no 'deny' that
3874 would definitely match a dynamic bootp client.
3876 - The 'ddns-update-style' configuration warning bit now insists that
3877 the configuration be globally scoped.
3879 - Two memory leaks in dhclient were closed thanks to a patch from Felix
3882 - Some minor but excellently pedantic documentation errors were fixed
3883 thanks to a patch from Thomas Klausner.
3885 - Bugs in operator precedence in executable statements have been repaired
3886 once again. More legal syntaxes should be parsed legally.
3888 - Failing to initialize a tracefile for any reason if a tracefile was
3889 specified is now a fatal error. Thanks to a patch from Albert Herranz.
3891 - Corrected a bug in which the number of leases transferred as calculated
3892 by the failover primary and sent to peers in POOLRESP responses may be
3893 incorrect. This value is not believed to be used by other failover
3894 implementations, excepting perhaps as logged information.
3896 - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
3897 sending POOLREQ messages instead of POOLRESP mesasges. This message
3898 was essentially ignored since failover secondaries effectively do not
3899 respond to POOLREQ messages.
3901 - Type definitions for various bitwidths of integers in the sunos5-5
3902 build of ISC DHCP have been fixed. It should compile and run more
3903 easily when built in 64-bit for this platform.
3905 - "allow known-clients;" is now a legal syntax, to avoid confusion.
3907 - If one dhcp server chooses to 'load balance' a request to its failover
3908 peer, it first checks to see if it believes said peer has a free
3909 lease to allocate before ignoring the DISCOVER.
3911 - log() was logging a work buffer, rather than the value returned by
3912 executing the statements configured by the user. In some cases,
3913 the work buffer and the intended results were the same. In some other
3914 cases, they were not. This was fixed thanks to a patch from Gunnar
3915 Fjone and directconnect.no.
3917 - Compiler warnings for some string type conversions was fixed, thanks
3918 to Andreas Gustafsson.
3920 - The netbsd build environments were simplified to one, in which
3921 -Wconversion is not used, thanks to Andreas Gustafsson.
3923 - How randomness in the backoff-cutoff dhclient configuration variable
3924 is implemented was better documented in the manpage, and the behaviour
3925 of dhclient in REQUEST timeout handling was changed to match that of
3926 DISCOVER timeout handling.
3928 - Omapi was hardened against clients that pass in null values, thanks
3929 to a patch from Mark Jason Dominus.
3931 - A bug was fixed in dhclient that kept it from doing client-side
3932 ddns updates. Thanks to a patch from Andreas Gustafsson, which
3933 underwent some modification after review by Jason Vas Dias.
3935 - Failover implementations disconnected due to the network between
3936 them (rather than one of the two shutting down) will now try to
3937 re-establish the failover connection every 5 seconds, rather than
3938 to simply try once and give up until one of them is restarted.
3939 Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
3940 by Greger V. Teigre which led to an enhancement to it.
3942 - A problem that kept DHCP Failover secondaries from tearing down
3943 ddns records was repaired. Thanks to a patch from Ulf Ekberg from
3946 - 64bit pointer sizes are detected properly on FreeBSD now.
3948 - A bug was repaired where the DHCP server would leave stale references
3949 to host records on leases it once thought about offering to certain
3950 clients. The result would be to apply host and 'known' scopes to the
3951 wrong clients (possibly denying booting). NOTE: The 'mis-host' patch
3952 that was being circulated as a workaround is not the way this bug was
3953 fixed. If you were a victim of this bug in 3.0.1, you are cautioned
3954 to proceed carefully and see if it fixes your problem.
3956 - A bug was repaired in the server's DHCPINFORM handling, where it
3957 tried to divine the client's address from the source packet and
3958 would get it wrong. Thanks to Anshuman Singh Rawat.
3960 - A log message was introduced to help illuminate the case where the
3961 server was unable to find a lease to assign to any BOOTP client.
3962 Thanks to Daniel Baker.
3964 - A minor dhcpd.conf.5 manpage error was fixed.
3966 Changes since 3.0.1rc14
3968 - The global variable 'cur_time' was centralized and is now uniformly of a
3969 type #defined in system-dependent headers. It had previously been defined
3970 in one of many places as a 32-bit value, and this causes mayhem on 64-bit
3971 big endian systems. It probably wasn't too healthy on little endian
3974 - A printf format string error introduced in rc14 was repaired.
3976 - AIX system-dependent header file was altered to only define NO_SNPRINTF
3977 if the condition used to #ifdef in vsnprintf in AIX' header files
3980 - The Alpha/OSF system-dependent header file was altered to define
3981 NO_SNPRINTF on OS revisions older than 4.0G.
3983 - omapip/test.c had string.h added to its includes.
3985 Changes since 3.0.1rc13
3987 ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
3988 in logging messages with excessively long hostnames provided by the
3989 clients. It is highly probable that these could have been used by
3990 attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
3991 release candidates 12 or 13. Special thanks to Gregory Duchemin for
3992 both finding and solving the problem.
3994 ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
3995 in log_*() functions was evidenced, on some specific platforms where
3996 vsnprintf() was not believed to be available and calls were wrapped to
3997 sprintf() instead. Again, credit goes to Gregory Duchemin for finding
3998 the problem. Calls to snprintf() are now linked to a distribution-local
3999 snprintf implementation, only in those cases where the architecture is
4000 not known to provide one (see includes/cf/[arch].h). If you experience
4001 linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
4002 is where to look. This vulnerability did not exist in any previously
4003 published version of ISC DHCP.
4005 - Compilation on hpux 11.11 was repaired.
4007 - 'The cross-compile bug fix' was backed out.
4009 Changes since 3.0.1rc12
4011 - Fixed a bug in omapi lease lookup function, to form the hardware
4012 address for the hash lookup correctly, thanks to a patch from
4015 - Fixed a bug where dhcrelay was sending relayed responses back to the
4016 broadcast address, but with the source's unicast mac address. Should
4017 now conform to rfc2131 section 4.1.
4019 - Cross-compile bug fix; use $(AR) instead of ar. Thanks to Morten Brorup.
4021 - Fixed a crash bug in dhclient where dhcpd servers that do not provide
4022 renewal times results in an FPE. As a side effect, dhclient can now
4023 properly handle 0xFFFFFFFF (-1) expiry times supplied by servers. Thanks
4024 to a patch from Burt Silverman.
4026 - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
4027 and reformatted to correct a compilation error on Solaris platforms.
4029 - A patch was applied which fixes a case where leases read from the
4030 leases database do not properly over-ride previously read leases.
4032 - dhcpctl.3 manpage was tweaked.
4034 Changes since 3.0.1rc11
4036 - A patch from Steve Campbell was applied with minor modifications to
4037 permit reverse dns PTR record updates with values containing spaces.
4039 - A patch from Florian Lohoff was applied with some modifications to
4040 dhcrelay. It now discards packets whose hop count exceeds 10 by default,
4041 and a command-line option (-c) can be used to set this threshold.
4043 - A failover bug relating to identifying peers by name length instead of
4046 - Declaring failover configs within shared-network statements should no
4047 longer result in error.
4049 - The -nw command line option to dhclient now works.
4051 - Thanks to a patch from Michael Richardson:
4052 - Some problems with long option processing have been fixed.
4053 - Some fixes to minires so that updates of KEY records will work.
4055 - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
4056 see contrib/ms2isc/readme.txt for revision notes.
4058 - Dhclient no longer uses shell commands to kill another instance of
4059 itself, it sends the signal directly. Thanks to a patch from Martin
4062 - The FreeBSD dhclient-script was changed so that a failure to write to
4063 /etc/resolv.conf does not prematurely end the script. This keeps dhclient
4064 from looping infinitely when this is the case. Thanks to a patch from
4067 - A patch from Bill Stephens was applied which resolves a problem with lease
4068 expiry times in failover configurations.
4070 - A memory leak in configuration parsing was closed thanks to a patch from
4073 - The function which discovers interfaces will now skip non-broadcast or
4074 point-to-point interfaces, thanks to a patch from David Brownlee.
4076 - Options not yet known by the dhcpd or dhclient have had their names
4077 changed such that they do not contain # symbols, in case they should ever
4078 appear in a lease file. An option that might have been named "#144" is
4081 - Another patch from Bill Stephens which allows the ping-check timeout to
4082 be configured as 'ping-timeout'. Defaults to 1.
4084 Changes since 3.0.1rc10
4086 - Potential buffer overflows in minires repaired.
4088 - A change to the linux client script to use /bin/bash, since /bin/sh may
4091 - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
4093 - A correction of boolean parsing syntax validation - some illegal syntaxes
4094 that worked before are now detected and produce errs, some legal syntaxes
4095 that errored before will now work properly.
4097 - Some search-and-replace errors that caused some options to change their
4100 - Shu-min Chang of the Intel corporation has contributed a perl script and
4101 module that converts the MS NT4 DHCP configuration to a ISC DHCP3
4104 - Applied the remainder of the dhcpctl memory leak patch provided by Bill
4105 Squier at ReefEdge, Inc. (groo@reefedge.com).
4107 - Missing non-optional failover peer configurations will now result in a soft
4108 error rather than a null dereference.
4110 Changes since 3.0.1rc9
4112 - A format string was corrected to fix compiler warnings.
4114 - A number of spelling corrections were made in the man pages.
4116 - The dhclient.conf.5 man page was changed to refer to do-forward-updates
4117 rather than a configuration option that doesn't exist.
4119 - A FreeBSD-specific bug in the interface removal handling was fixed.
4121 - A Linux-specific Token Ring detection problem was fixed.
4123 - Hashes removed from as-yet-unknown agent options, having those options
4124 appear in reality before we know about them will no longer produce
4125 self-corrupting lease databases.
4127 - dhclient will use the proper port numbers now when using the -g option.
4129 - A order-of-operations bug with 2 match clauses in 1 class statement is
4130 fixed thanks to a patch from Andrew Matheson.
4132 - Compilation problems on Solaris were fixed.
4134 - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
4136 - A fix to the dhcp ack process which makes certain group options will be
4137 included in the first DHCPOFFER message was made thanks to a patch from
4140 - A few memory leaks were repaired thanks to patches from Bill Squier at
4141 ReefEdge, Inc. (groo@reefedge.com).
4143 - A fix for shared-networks that sometimes give clients options for the
4144 wrong subnets (in particular, 'option routers') was applied, thanks to
4145 Ted Lemon for the patch.
4147 - Omshell's handling of dotted octets as values was changed such that dots
4148 one after the other produce zero values in the integer string.
4150 Changes since 3.0.1rc8
4152 - Fix a format string vulnerability in the server that could lead to a
4153 remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
4155 - Add additional support for NetBSD/sparc64.
4157 - Fix a bug in the command-line parsing of the client. Also, resolve
4160 - Add better support for shells other than bash in the Linux client
4163 - Various build fixes for modern versions of FreeBSD and Linux.
4165 - Fix a bad bounds check when printing binding state names.
4167 - Clarify documentation about fixed-address and multiple addresses.
4169 - Fix a typo in the authoritative error message.
4171 - Make a log entry when we can't write a billing class.
4173 - Use conversion targets that are the right size on all architectures.
4175 - Increment the hop count when relaying.
4177 - Log a message when lease state is changed through OMAPI.
4179 - Don't rerun the shared_network when evaluating the pool.
4181 - Fix a reversed test in the parser.
4183 - Change the type of rbuf_max.
4185 - Make FTS_LAST a manifest constant to quiet warnings.
4187 Changes since 3.0.1rc7
4189 - Fix two compiler warnings that are generated when compiling on Solaris
4190 with gcc. These stop the build, even though they weren't actually
4191 errors, because we prefer that our builds generate no warnings.
4193 Changes since 3.0.1rc6
4195 - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
4198 - Implement lease stealing for cases where the primary has fewer leases
4199 than the secondary, as called for by the standard.
4201 - Add a fudge factor to the lease expiry acceptance code, (suggested
4202 by Kevin Miller of CMU).
4204 - Fix a bug in permit_list_match that made it much too willing to say
4205 that two permit lists matched.
4207 - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
4208 also more compact) messages about DNS updates.
4210 - Fix a bug in generating wire-format domain names for the FQDN option.
4212 - Fix a bug where the FQDN option would not be returned if the client
4213 requested it, contrary to the standard.
4215 - On Darwin, use the FreeBSD DHCP client script.
4217 - On NetBSD/sparc, don't check for casting warnings.
4219 - Add a flag in the DHCP client to disable updating the client's A
4220 record when sending an FQDN option indicating that the client is
4221 going to update its A record.
4223 - In the client, don't attempt a DNS update until one second after
4224 configuring the new IP address, and if the update times out, keep
4225 trying until a response, positive or negative, is received from the
4228 - Fix an uninitialized memory bug in the DHCP client.
4230 - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
4232 - Fix a bug in ns_parserr(), where it was returning the wrong sort
4233 of result code in some cases (suggested by Ben Harris of the
4236 - Fix a bug in is_identifier(), where it was checking against EOF
4237 instead of the END_OF_FILE token (also suggested by Ben Harris).
4239 - Fix a bug where if an option universe contained no options, the
4240 DHCP server could dump core (Walter Steiner).
4242 - Fix a bug in the handling of encapsulated options.
4244 - Fix a bug that prevented NWIP suboptions from being processed.
4246 - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
4247 as modifier flags to the FTS_ACTIVE state, as called for in the
4248 failover protocol standard.
4250 - Fix bugs in the pool merging code that resulted in references and
4251 dereferences of null pointers. This bug had no impact unless the
4252 POINTER_DEBUG flag was defined.
4254 - In the server, added a do-forward-updates flag that can be used to
4255 disable forward updates in all cases, so that sites that want the
4256 clients to take sole responsibility for updating their A record can
4259 - Make it possible to disable optimization of PTR record updates.
4261 Changes since 3.0.1rc5
4263 - Include some new documentation and changes provided by Karl Auer.
4265 - Add a workaround for some Lexmark printers that send a double-NUL-
4266 terminated host-name option, which would break DNS updates.
4268 - Fix an off-by-one error in the MAC-address checking code for
4269 DHCPRELEASE that was added in 3.0.1rc5.
4271 - Fix a bug where client-specific information was not being discarded
4272 from the lease when it expired or was released, resulting in
4273 problems if the lease was reallocated to a different client.
4275 - If more than one allocation pool is specified that has the same set
4276 of constraints as another allocation pool on the same shared
4277 network, merge the two pools.
4279 - Don't print an error in fallback_discard, since this just causes
4280 confusion and does not appear to be helping to encourage anyone to
4283 Changes since 3.0.1rc4
4285 - Fix a bug that would cause the DHCP server to spin if asked to parse
4286 a certain kind of incorrect statement.
4288 - Fix a related bug that would prevent an error from being reported in
4291 - Additional documentation.
4293 - Make sure that the hardware address matches the lease when
4294 processing a DHCPRELEASE message.
4296 Changes since 3.0.1rc3
4298 - A minor bug fix in the arguments to a logging function call.
4299 - Documentation update for dhcpd.conf.
4301 Changes since 3.0.1rc2
4303 - Allow the primary to send a POOLREQ message. This isn't what the current
4304 failover draft says to do, so we may have to back it out if I can't get the
4305 authors to relent, but the scheme for balancing that's specified in the
4306 current draft seems needlessly hairy, so I'm floating a trial balloon.
4307 The rc1 code did not implement the method described in the draft either.
4309 Changes since 3.0.1rc1
4311 - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
4312 domain or RRSET. This allows the DHCP server to forget about a name
4313 it added to the DNS once it's been removed, even if the DHCP server
4314 wasn't the one that removed it.
4316 - Install defaults for failover maximum outstanding updates and maximum
4317 silent time. This prevents problems that might occur if these values
4318 were not configured.
4320 - Don't do DDNS deletes if ddns-update-style is none.
4322 - Return relay agent information options in DHCPNAK. This prevents DHCPNAK
4323 messages from being dropped when the relay agent information option contains
4324 routing information.
4326 - Fix a problem where coming up in recover wouldn't result in an update
4329 - Add some more chatty messages when we start a recovery update and when it's
4332 - Fix a possible problem where some state might have been left around
4333 after the peer lost contact and regained contact about how many updates
4336 - Don't nix a lease update because of a lease conflict. This test has
4337 never (as far as I know) prevented a mistake, and it appears to cause
4338 problems with failover.
4340 - Add support in rc history code for keeping a selective history, rather
4341 than a history of all references and dereferences. This code is only used
4342 when extensive additional debugging is enabled.
4346 - Make allocators for hash tables. As a side effect, this fixes a memory
4347 smash in the subclass allocation code.
4349 - Fix a small bug in omshell where if you try to close an object when
4350 no object is open, it dumps core.
4352 - Fix an obscure coredump that could occur on shutdown.
4354 - Fix a bug in the recording of host declaration rubouts in the lease file.
4356 - Fix two potential spins in the host deletion code.
4358 - Fix a core dump that would happen if an application tried to update
4359 a host object attribute with a null value.
4361 Changes since 3.0 Release Candidate 12
4363 - Fix a memory leak in the evaluation code.
4365 - Fix an obscure core dump.
4367 - Print a couple of new warnings when parsing the configuration file
4368 when crucial information is left out.
4370 - Log "no free leases" as an error.
4372 - Documentation updates.
4374 Changes since 3.0 Release Candidate 11
4376 - Always return a subnet selection option if one is sent.
4378 - Fix a warning that was being printed because an automatic data
4379 structure wasn't zeroed.
4381 - Fix some failover state transitions that were being handled
4384 - When supersede_lease is called on a lease whose end time has already
4385 expired, but for which a state transition has not yet been done, do
4386 a state transition. This fixes the case where if the secondary
4387 allocated a lease to a client and the lease "expired" while the
4388 secondary was in partner-down, no expiry event would actually
4389 happen, so the lease would remain active until the primary was
4392 Changes since 3.0 Release Candidate 10
4394 - Fix a bug that was preventing released leases from changing state
4395 in failover-enabled pools.
4397 - Fix a core dump in the client identifier finder code (for host
4400 - Finish fixing a bug where bogus data would sometimes get logged to
4401 the dhclient.leases file because it was opened as descriptor 2.
4403 - Fix the Linux dhclient-script according to suggestions made by
4404 several people on the dhcp-client mailing list.
4406 - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
4408 - Print an error message and refuse to run if a failover peer is
4409 defined but not referenced by any pools.
4411 - Correct a confusing error message in failover.
4413 Changes since 3.0 Release Candidate 9
4415 - Fix a bug in lease allocation for Dynamic BOOTP clients.
4417 Changes since 3.0 Release Candidate 8 Patchlevel 2
4419 - Fix a bug that prevented update-static-leases from working.
4421 - Document failover-state OMAPI object.
4423 - Fix a compilation error on SunOS 4.
4425 Changes since 3.0 Release Candidate 8 Patchlevel 1
4427 - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
4428 This was introduced in rc8pl1 as an unintended result of the memory
4429 leakage fixes that were in pl1.
4431 - Fix a long-standing bug where the server would record that an update
4432 had been done for a client with no name, even though no update had
4433 been done, and then when the client's lease expired the deletion of
4434 that nonexistant record would time out because the name was the null
4437 - Clean up the omshell, dhcpctl and omapi man pages a bit.
4439 Changes since 3.0 Release Candidate 8
4441 - Fix a bug that could cause the DHCP server to spin if
4442 one-lease-per-client was enabled.
4444 - Fix a bug that was causing core dumps on BSD/os in the presence of
4447 - In partner-down state, don't restrict lease lengths to MCLT.
4449 - On the failover secondary, record the MCLT received from the primary
4450 so that if we come up without a connection to the primary we don't
4451 wind up giving out zero-length leases.
4453 - Fix some compilation problems on BSD/os.
4455 - Fix a bunch of memory leaks.
4457 - Fix a couple of bugs in the option printer.
4459 - Fix an obscure error reporting bug in the dns update code, and also
4460 make the message clearer when a key algorithm isn't supported.
4462 - Fix a bug in the tracing code that prevented trace runs that used
4463 tcp connections from being played back.
4465 - Add some additional debugging capability for catching memory leaks
4468 - Make the client release the lease correctly on shutdown.
4470 - Add some configurability to the build system.
4472 - Install omshell manual page in man1, not man8.
4474 - Craig Gwydir sent in a patch that fixes a long-standing bug in the
4475 DHCP client that could cause core dumps, but that for some reason
4476 hadn't been noticed until now.
4478 Changes since 3.0 Release Candidate 7
4480 - Fix a bug in failover where we weren't sending updates after a
4481 transition from communications-interrupted to normal.
4483 - Handle expired/released/reset -> free transition according to the
4484 protocol specification (this works - the other way not only wasn't
4485 conformant, but also didn't work).
4487 - Add a control object in both client and server that allows either
4488 daemon to be shut down cleanly.
4490 - When writing a lease, if we run out of disk space, shut down the
4491 output file and insist on writing a new one before proceeding.
4493 - In the server, if the OMAPI listener port is occupied, keep trying
4494 to get it, rather than simply giving up and exiting.
4496 - Support fetching variables from leases and also updating and adding
4497 variables to leases via OMAPI.
4499 - If two failover peers have wildly different clocks, refuse to start
4502 - Fix a bug in the DNS update code that could cause core dumps when
4503 running on alpha processors.
4505 - Fixed a bug in ddns updates for static lease entries, thanks to a
4506 patch from Andrey M Linkevitch.
4508 - Add support for Darwin/MacOS X
4510 - Install omshell (including new documentation).
4512 - Support DNS updates in the client (this is a very obscure feature
4513 that most DHCP client users probably will not be able to use).
4515 - Somewhat cleaner status logging in the client.
4517 - Make OMAPI key naming syntax compatible with the way keys are
4518 actually named (key names are domain names).
4520 - Fix a bug in the lease file writer.
4522 - Install DHCP ISC headers in a different place than BIND 9 ISC
4523 headers, to avoid causing trouble in BIND 9 builds.
4525 - Don't send updates for attributes on an object when the attributes
4526 haven't changed. Support deleting attributes on remote objects.
4528 - Fix a number of bugs in omshell, and add the unset and refresh
4531 - Handle disconnects in OMAPI a little bit more intelligently (so that
4532 the caller gets ECONNRESET instead of EINVAL).
4534 - Fix a bunch of bugs in the handling of clients that have existing
4535 leases when the try to renew their leases while failover is
4538 Changes since 3.0 Release Candidate 6
4540 - Fix a core dump that could happen when processing a DHCPREQUEST from
4541 a client that had a host declaration that contained both a
4542 fixed-address declaration and a dhcp-client-identifier option
4543 declaration, if the client identifier was longer than nine bytes.
4545 - Fix a memory leak that could happen in certain obscure cases when
4546 using omapi to manipulate leases.
4548 - Fix some bugs and omissions in omshell.
4550 Changes since 3.0 Release Candidate 5
4552 - Fix a bug in omapi_object_dereference that prevented objects in
4553 chains from having their reference counts decreased on dereference.
4555 - Fix a bug in omapi_object_dereference that would prevent object
4556 chains from being freed upon removal of the last reference external
4559 - Fix a number of other memory leaks in the OMAPI protocol subsystem.
4561 - Add code in the OMAPI protocol handler to trace memory leakage.
4563 - Clean up the memory allocation/reference history printer.
4565 - Support input of dotted quads and colon-separated hex lists as
4566 attribute values in omshell.
4568 - Fix a typo in the Linux interface discovery code.
4570 - Conditionalize a piece of trace code that wasn't conditional.
4572 Changes since 3.0 Release Candidate 4
4574 - Fix a bug that would prevent leases from being abandoned properly on
4577 - Fix failover peer OMAPI support.
4579 - In failover, correctly handle expiration of leases. Previously,
4580 leases would never be reclaimed because they couldn't make the
4581 transition from EXPIRED to FREE.
4583 - Fix some broken failover state transitions.
4585 - Documentation fixes.
4587 - Take out an unnecessary check in DHCP relay agent information option
4588 stashing code that was preventing REBINDING clients from rebinding.
4590 - Prevent failover peers from allocating leases in DHCPREQUEST
4591 processing if the lease belongs to the other server.
4593 - Record server version in lease file introductory comment.
4595 - Correctly report connection errors in OMAPI and failover.
4597 - Make authentication signature algorithm name comparisons in OMAPI
4600 - Fix compile problem on SunOS 4.x
4602 - If a signature algorithm is not terminated with '.', terminate it so
4603 that comparisons between fully-qualified names will work
4606 - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
4607 systems with the probe not working correctly.
4609 - Don't allow user to type omapi key on command line of omshell.
4611 Changes since 3.0 Release Candidate 3
4613 - Do lease billing on startup in a way that I *think* will finally do
4614 the billing correctly - the previous method could overbill as a
4615 result of duplicate leases.
4617 - Document OMAPI server objects.
4619 Changes since 3.0 Release Candidate 2 Patchlevel 1
4621 - Fix some problems in the DDNS update code. Thanks to Albert
4622 Herranz for figuring out the main problem.
4624 - Fix some reference counting errors on host entries that were causing
4627 - Fix a byte-swap bug in the token ring code, thanks to Jochen
4630 - Fix a bug in lease billing, thanks to Jonas Bulow.
4632 Changes since 3.0 Release Candidate 2
4634 - Change the conditions under which a DHCPRELEASE is actually
4635 committed to be consistent with lease binding states rather than
4636 using the lease end time. This may fix some problems with the
4639 - Fix a bug where lease updates would fail on Digital Unix (and maybe
4640 others) because malloc was called with a size of zero.
4642 - Fix a core dump that happens when the DHCP server can't create its
4645 Changes since 3.0 Release Candidate 1 Patchlevel 1
4647 - Fix the dhcp_failover_put_message to not attempt to allocate a
4648 zero-length buffer. Some versions of malloc() fail if you try to
4649 allocate a zero-length buffer, and this was causing problems on,
4652 - Fix a case where the failover code was printing an error message
4653 when no error had occurred.
4655 - Fix a problem where when a server went down and back up again, the
4656 peer would not see a state transition and so would stay in the
4657 non-communicating state.
4659 - Be smart about going into recover_wait.
4661 - Fix a problem in the failover implementation where peers would fail
4662 to come into sync if interrupted in the RECOVER state. This could
4663 have been the cause of some problems people have reported recently.
4665 - Fix a problem with billing classes where they would not be unbilled
4666 when the client lease expired.
4668 - If select fails, figure out which descriptor is bad, and cut it out
4669 of the I/O loop. This prevents a potentially nasty spin. I
4670 haven't heard any report it in a while, but it came up consistently
4673 - Fix a bug in the relay agent where if you specified interfaces on
4674 the command line, it would fail.
4676 - Fix a couple of small bugs in the omapi connection object (no known
4679 - Add the missing 3.0 Beta 1 lease conversion script.
4681 - Read dhcp client script hooks if they exist, rather than only if
4684 Changes since 3.0 Release Candidate 1
4686 - Fix a memory smash that happens when fixed-address leases are used.
4687 ANY SITE AT WHICH FIXED-ADDRESS STATEMENTS ARE BEING USED SHOULD
4688 UPGRADE IMMEDIATELY. This has been a long-standing bug - thanks to
4689 Alvise Nobile for discovering it and helping me to find it!
4691 - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
4694 - There is a known problem with the DHCP server doing failover on
4695 Compaq Alpha systems. This patchlevel is not a release candidate
4696 because of this bug. The bug should be straightforward to fix, so
4697 a new release candidate is expected shortly.
4699 - There is a known problem in the DDNS update code that is probably a
4700 bug, and is not, as far as we know, fixed in this patchlevel.
4702 Changes since 3.0 Beta 2 Patchlevel 24
4704 - Went over problematic failover state transitions and made them all
4705 work, so that failover should now much less fragile.
4707 - Add some dhcpctl and omapi documentation
4709 - Fix compile errors when compiling with unusual predefines.
4711 - Make Token Ring work on Linux 2.4
4713 - Fix the Digital Unix BPF_WORDALIGN bug.
4715 - Fix some dhcp client documentation errors.
4717 - Update some parts of the README file.
4719 - Support GCC on SCO.
4721 Changes since 3.0 Beta 2 Patchlevel 23
4723 - Fix a bug in the DNS update code where a status code was not being
4724 checked. This may have been causing core dumps.
4726 - When parsing the lease file, if a lease declaration includes a
4727 billing class statement, and the lease already has a billing class,
4728 unbill the old class.
4730 - When processing failover transactions, where acks will be deferred,
4731 process the state transition immediately.
4733 - Don't try to use the new SIOCGIFCONF buffer size detection code on
4734 Linux 2.0, which doesn't provide this functionality.
4736 - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
4738 - Fix a problem in using the which command in the configure script.
4740 - Fix a parse error in the client when setting up an omapi listener.
4742 - Document the -n and -g flags to the client.
4744 - Make sure there is always a stdin and stdout on startup. This
4745 prevents shell scripts from accidentally writing error messages into
4746 configuration files that happen to be opened as stderr.
4748 - If an interface is removed, the client will now notice that it is
4749 gone rather than spinning. This has only been tested on NetBSD.
4751 - The client will attempt to get an address even if it can't create a
4754 - Don't overwrite tracefiles.
4756 - Fix some memory allocation bugs in failover.
4758 Changes since 3.0 Beta 2 Patchlevel 22
4760 - Apply some patches suggested by Cyrille Lefevre, who is maintaining
4761 the FreeBSD ISC DHCP Distribution port.
4763 - Fix a core dump in DHCPRELEASE.
4765 Changes since 3.0 Beta 2 Patchlevel 21
4767 - This time for sure: fix the spin described in the changes for pl20.
4769 Changes since 3.0 Beta 2 Patchlevel 20
4771 - Fix a problem with Linux detecting large numbers of interfaces (Ben)
4773 - Fix a memory smash in the quotify code, which was introduced in
4776 - Actually fix the spin described in the changes for pl20. The
4777 previous fix only partially fixed the problem - enough to get it
4778 past the regression test.
4780 Changes since 3.0 Beta 2 Patchlevel 19
4782 - Fix a bug that could cause the server to abort if compiled with
4783 POINTER_DEBUG enabled.
4785 - Fix a bug that could cause the server to spin when responding to a
4788 - Apply Joost Mulders' suggested patches for DLPI on x86.
4790 - Support NUL characters in quoted strings.
4792 - Install unformatted man pages on SunOS.
4794 Changes since 3.0 Beta 2 Patchlevel 18
4796 - Allow the server to be placed in partner-down state using OMAPI.
4799 - Implement omshell, which can be used to do arbitrary things to the
4800 server (in theory). (Damien Neil)
4802 - Fix a case where if a client had two different leases the server could
4803 actually dereference the second one when it hadn't been referenced,
4804 leading to memory corruption and a core dump. (James Brister)
4806 - Fix a case where a client could request the address of another client's
4807 lease, but find_lease wouldn't detect that the other client had it, and
4808 would attempt to allocate it to the client, resulting in a lease conflict
4811 - Fix a case where a client with more than one client identifier could be
4812 given a lease where the hardware address was correct but the client
4813 identifier was not, resulting in a lease conflict message.
4815 - Fix a problem where the server could write out a colon-separated
4816 hex list as a value for a variable, which would then not parse.
4817 The fix is to always write strings as quoted strings, with any
4818 non-printable characters quoted as octal escape sequences. So
4819 a file written the old way still won't work, but new files written
4822 - Fix documentation for sending non-standard options.
4824 - Use unparsable names for unknown options. WARNING: this will
4825 break any configuration files that use the option-nnn convention.
4826 If you want to continue to use this convention for some options,
4827 please be sure to write a definition, like this:
4829 option option-nnn code nnn = string;
4831 You can use a descriptive name instead of option-nnn if you like.
4833 - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
4834 DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
4835 result of a deceptively silly bug in supersede_lease.
4837 - Fix client script exit status check, according to a fix supplied by
4840 - Fix an endianness bug in the tracefile support, regarding ICMP
4843 - Fix a bug in the client where the medium would not work correctly if
4844 it contained quoted strings.
4846 ** there was no pl17 **
4848 Changes since 3.0 Beta 2 Patchlevel 16
4850 - Add support for transaction tracing. This allows the state of the
4851 DHCP server on startup, and all the subsequent transactions, to be
4852 recorded in a file which can then be played back to reproduce the
4853 behaviour of the DHCP server. This can be used to quickly
4854 reproduce bugs that cause core dumps or corruption, and also for
4855 tracking down memory leaks.
4857 - Incorporate some bug fixes provided by Joost Mulders for the DLPI
4858 package which should clear up problems people have been seeing on
4861 - Fix bugs in the handling of options stored as linked lists (agent
4862 options, fqdn options and nwip options) that could cause memory
4863 corruption and core dumps.
4865 - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
4866 not being send in some cases when they were needed.
4868 - Make the lease structure somewhat more compact.
4870 - Make initial failover startup *much* faster. This was researched
4871 and implemented by Damien Neil.
4873 - Add a --version flag to all executables, which prints the program
4874 name and version to standard output.
4876 - Don't rewrite the lease file every thousand leases.
4878 - A bug in nit.c for older SunOS machines was fixed by a patch sent in
4879 by Takeshi Hagiwara.
4881 - Fix a memory corruption bug in the DHCP client.
4883 - Lots of documentation updates.
4885 - Add a feature allowing environment variables to be passed to the
4886 DHCP client script on the DHCP client command line.
4888 - Fix client medium support, which had been broken for some time.
4890 - Fix a bug in the DHCP client initial startup backoff interval, which
4891 would cause two DHCPDISCOVERS to be sent back-to-back on startup.
4893 Changes since 3.0 Beta 2 Patchlevel 15
4895 - Some documentation tweaks.
4897 - Maybe fix a problem in the DLPI code.
4899 - Fix some error code space inconsistencies in ddns update code.
4901 - Support relay agents that intercept unicast DHCP messages to stuff
4902 agent options into them.
4904 - Fix a small memory leak in the relay agent option support code.
4906 - Fix a core dump that would occur if a packet was sent with no
4909 Changes since 3.0 Beta 2 Patchlevel 14
4911 - Finish fixing a long-standing bug in the agent options code. This
4912 was causing core dumps and failing to operate correctly - in
4913 particular, agent option stashing wasn't working. Agent option
4914 stashing should now be working, meaning that agent options can be
4915 used in class statements to control address allocation.
4917 - Fix up documentation.
4919 - Fix a couple of small memory leaks that would have added up
4920 significantly in a high-demand situation.
4922 - Add a log-facility configuration parameter.
4924 - Fix a compile error on some older operating systems.
4926 - Add the ability in the client to execute certain statements before
4927 transmitting packets to the server. Handy for debugging; not much
4928 practical use otherwise.
4930 - Don't send faked-out giaddr when renewing or bound - again, useful
4933 Changes since 3.0 Beta 2 Patchlevel 13
4935 - Fixed a problem where the fqdn decoder would sometimes try to store
4936 an option with an (unsigned) negative length, resulting in a core
4937 dump on some systems.
4939 - Work around the Win98 DHCP client, which NUL-terminates the FQDN
4942 - Work around Win98 and Win2k clients that will claim they want to do
4943 the update even when they don't have any way to do it.
4945 - Fix some log messages that can be printed when failover is operating
4946 that were not printing enough information.
4948 - It was possible for a DHCPDISCOVER to get an allocation even when
4949 the state machine said the server shouldn't be responding.
4951 - Don't load balance DHCPREQUESTs from clients in RENEWING and
4952 REBINDING, since in RENEWING, if we heard it, it's for us, and in
4953 REBINDING, the client wouldn't have got to REBINDING if its primary
4956 - When we get a bogus state lease binding state transition, don't do
4960 Changes since 3.0 Beta 2 Patchlevel 12
4962 - Fixed a couple of silly compile errors.
4964 Changes since 3.0 Beta 2 Patchlevel 11
4966 - Albert Herranz tracked down and fixed a subtle bug in the base64
4967 decoder that would prevent any key with an 'x' in its base64
4968 representation from working correctly.
4970 - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
4971 hang that they both spotted in the DHCP server - when
4972 one-lease-per-client was set, the code to release the "other" lease
4975 - Fix a problem with alignment of the input buffer in bpf in cases
4976 where two packets arrive in the same bpf read.
4978 - Fix a problem where the relay agent would crash if you specified an
4979 interface name on the command line.
4981 - Add the ability to conditionalize client behaviour based on the
4984 - Add support for the FQDN option, and added support for a new way of
4985 doing ddns updates (ddns update style interim) that allows more than
4986 one DHCP server to update the DNS for the same network(s). This
4987 was implemented by Damien Neil with some additional functionality
4990 - Damien added a "log" statement, so that the configuration file can
4991 be made to log debugging information and other information.
4993 - Fixed a bug that caused option buffers not to be terminated with an
4996 - Fixed a long-standing bug in the support for option spaces where the
4997 options are stored as an ordered list rather than in a hash table,
4998 which could theoretically result in memory pool corruption.
5000 - Prevent hardware declarations with no actual hardware address from
5001 being written as something unparsable, and behave correctly in the
5002 face of a null hardware address on input.
5004 - Allow key names to be FQDNs, and qualify the algorithm name if it is
5005 specified unqualified.
5007 - Modify the DDNS update code so that it never prints the "resolver
5008 failed" message, but instead says *why* the resolver failed.
5010 - Officially support the subnet selection option, which now has an
5013 - Fix a build bug on MacOS X.
5015 - Allow administrator to disable ping checking.
5017 - Clean up dhcpd.conf documentation and add more information about how
5020 Changes since 3.0 Beta 2 Patchlevel 10
5022 - Fix a bug introduced during debugging (!) and accidentally committed
5025 Changes since 3.0 Beta 2 Patchlevel 9
5027 - Fix DHCP client handling of vendor encapsulated options.
5029 - Fix a bug in the handling of relay agent information options introduced
5032 - Stash agent options on client leases by default, and use the stashed
5033 options at renewal time.
5035 - Add the ability to test the client's binding state in the client
5036 configuration language.
5038 - Fix a core dump in the DNS update code.
5040 - Fix some expression evaluation bugs that were causing updates to be
5041 done when no client hostname was received.
5043 - Fix expression evaluation debugging printfs.
5045 - Teach pretty_print_option to print options in option spaces other than
5046 the DHCP option space.
5048 - Add a warning message if the RHS of a not is not boolean.
5050 - Never select for more than a day, because some implementations of
5051 select will just fail if the timeout is too long (!).
5053 - Fix a case where a DHCPDISCOVER from an unknown network would be
5056 - Fix a bug where if a client requested an IP address for which a different
5057 client had the lease, the DHCP server would reallocate it anyway.
5059 - Fix the DNS update code so that if the client changes its name, the DNS
5060 will be correctly updated.
5062 Changes since 3.0 Beta 2 Patchlevel 8
5064 - Oops, there was another subtle math error in the header-length
5067 Changes since 3.0 Beta 2 Patchlevel 7
5069 - Oops, forgot to byte-swap udp header length before bounds-checking it.
5071 Changes since 3.0 Beta 2 Patchlevel 6
5073 - Fix a possible DoS attack where a client could cause the checksummer
5074 to dump core. This was a read, not a write, so it shouldn't be
5075 possible to exploit it any further than that.
5077 - Implement client- and server-side support for using the Client FQDN
5080 - Support for other option spaces in the client has been added. This
5081 means that it is now possible to define a vendor option space on the
5082 client, request options in that space from the server (which must
5083 define the same option space), and then use those options in the
5084 client. This also allows NWIP and Client FQDN options to be used
5087 - Add object initializer support. This means that objects can now be
5088 initialized to something other than all-zeros when allocated, which
5089 makes, e.g., the interface object support code a little more robust.
5091 - Fix an off-by-one bug in the host stuffer. This was causing host
5092 deletes not the work, and may also have been causing OMAPI
5093 connections to get dropped. Thanks to James Brister for tracking
5096 - Fixed a core dump in the interface discovery code that is triggered
5097 when there is no subnet declaration for an interface, but the server
5098 decides to continue running. Thanks to Shane Kerr for tracking
5099 down and fixing this problem.
5101 Changes since 3.0 Beta 2 Patchlevel 5
5103 - Fix a bug in the recent enhancement to the interface discovery code
5104 to support arbitrary-length interface lists.
5106 - Support NUL-terminated DHCP options when initializing client-script
5109 - Fix suffix operator.
5111 - Fix NetWare/IP option parsing.
5113 - Better error/status checking in dhcpctl initialization and omapi
5116 - Fix a potential memory smash in dhcpctl code.
5118 - Fix SunOS4 and (maybe) Ultrix builds.
5120 - Fix a bug where a certain sort of incoming packet could cause a core
5121 dump on Solaris (and probably elsewhere).
5123 - Add some more safety checks in error logging code.
5125 - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
5127 - Fix relay agent so that if an interface is specified on the command
5128 line, the relay agent does not dump core.
5130 - Fix class matching so that match if can be combined with match or
5133 - Do not allow spurious leases in the lease database to introduce
5134 potentially bogus leases into the in-memory database.
5136 - Fix a byte-order problem in the client hardware address type code
5139 - Be slightly less picky about what sort of hardware addresses OMAPI
5140 can install in host declarations.
5142 Changes since 3.0 Beta 2 Patchlevel 4
5144 - Incorporated Peter Marschall's proposed change to array/record
5145 parsing, which allows things like the slp-agent option to be encoded
5146 correctly. Thanks very much to Peter for taking the initiative to
5147 do this, and for doing such a careful job of it (e.g., updating the
5150 - Added an encoding for the slp-agent option. :')
5152 - Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
5153 request for help on this with patches!
5155 - Incorporated a change that should fix a problem reported by Philippe
5156 Jumelle where when the network connection between two servers is
5157 lost, they never reconnect.
5159 - Fix client script files other than that for NetBSD to actually use
5160 make_resolv_conf as documented in the manual page.
5162 - Fix a bug in the packet handling code that could result in a core
5165 - Fix a bug in the bootp code where responses on the local net would
5166 be sent to the wrong MAC address. Thanks to Jerry Schave for
5169 Changes since 3.0 Beta 2 Patchlevel 3
5171 - In the DHCP client, execute client statements prior to using the values
5172 of options, so that the client configuration can overridden, e.g., the
5175 - Fix a reference counting error that would result in very reproducible
5176 failures in updates, as well as occasional core dumps, if a zone was
5177 declared without a key.
5179 - Fix some Linux 2.0 compilation problems.
5181 - Fix a bug in scope evaluation during execution of "on" statements that
5182 caused values not to be recorded on leases.
5184 - If the dhcp-max-message-size option is specified in scope, and the
5185 client didn't send this option, use the one specified in scope to
5186 determine the maximum size of the response.
5188 Changes since 3.0 Beta 2 Patchlevel 2
5190 - Fix a case where spawning subclasses were being allocated
5191 incorrectly, resulting in a core dump.
5193 - Fix a case where the DHCP server might inappropriately NAK a
5196 - Fix a place dhcprequest() where static leases could leak.
5198 - Include memory.h in omapip_p.h so that we don't get warnings about
5201 Changes since 3.0 Beta 2 Patchlevel 1
5203 - Notice when SIOCFIGCONF returns more data than fit in the buffer -
5204 allocate a larger buffer, and retry. Thanks to Greg Fausak for
5207 - In the server, if no interfaces were configured, report an error and
5210 - Don't ever record a state of 'startup'.
5212 - Don't try to evaluate the local failover binding address if none was
5213 specified. Thanks to Joseph Breu for finding this.
projects / thirdparty / dhcp.git / blob