1 Internet Systems Consortium DHCP Distribution
9 Please note that that ISC DHCP is now licensed under the Mozilla Public License,
10 MPL 2.0. Please see https://www.mozilla.org/en-US/MPL/2.0/ to read the MPL 2.0
13 The areas of focus for ISC DHCP 4.4 were:
15 1. Dynamic DNS additions
16 2. dhclient improvements
17 3. Support for dynamic shared libraries
19 Dynamic DNS Improvements:
21 - We added three new server configuration parameters which influence DDNS
24 1. ddns-dual-stack-mixed-mode - alters DNS conflict resolution behavior
25 to mitigate issues with non-compliant clients in dual stack environments.
27 2. ddns-guard-id-must-match - relaxes the DHCID RR client id matching
28 requirement of DNS conflict resolution.
30 3. ddns-other-guard-is-dynamic - alters dual-stack-mixed-mode behavior to
31 allow unguarded DNS entries to be overwritten in certain cases
33 - The server now honors update-static-leases parameter for static DHCPv6
36 dhclient Improvements:
38 - We've added three command line parameters to dhclient:
40 1. --prefix-len-hint - directs dhclient to use the given length as
41 the prefix length hint when requesting prefixes
43 2. --decline-wait-time - instructs the client to wait the given number
44 of seconds after declining an IPv4 address before issuing a discover
46 3. --address-prefix-len - specifies the prefix length passed by dhclient
47 into the client script (via the environment variable ip6_prefixlen) with
48 each IPv6 address. We added this parameter because we have changed the
49 default value from 64 to 128 in order to be compliant with RFC3315bis
50 draft (-09, page 64) and RFC5942, Section 4, point 1.
51 **WARNING**: The new default value of 128 may not be backwardly compatible
52 with your environment. If you are operating without a router, such as
53 between VMs on a host, you may find they cannot see each other with prefix
54 length of 128. In such cases, you'll need to either provide routing or use
55 the command line parameter to set the value to 64. Alternatively you may
56 change the default at compile time by setting DHCLIENT_DEFAULT_PREFIX_LEN
59 - dhclient will now generate a DHCPv6 DECLINE message when the client script
60 indicates a DAD failure
62 Dynamic shared library support:
64 Configure script, configure.ac+lt, which supports libtool is now provided
65 with the source tar ball. This script can be used to configure ISC DHCP
66 to build with libtool and thus use dynamic shared libraries.
70 - The server now supports dhcp-cache-threshold for DHCPv6 operations
71 - The server now supports DHPv6 address allocation based on EUI-64 DUIDs
72 - Experimental support for alternate relay port in the both the server
73 and relay for IPv4, IPv6 and 4o6 (see: draft-ietf-dhc-relay-port-10.txt)
75 For information on how to install, configure and run this software, as
76 well as how to find documentation and report bugs, please consult the
79 ISC DHCP uses standard GNU configure for installation. Please review the
80 output of "./configure --help" to see what options are available.
82 The system has only been tested on Linux, FreeBSD, and Solaris, and may not
83 work on other platforms. Please report any problems and suggested fixes to
86 ISC DHCP is open source software maintained by Internet Systems
87 Consortium. This product includes cryptographic software written
88 by Eric Young (eay@cryptsoft.com).
90 Changes since 4.4.1 (New Features)
92 - A new configuration parameter, ping-cltt-secs (v4 operation only), has
93 been added to allow the user to specify the number of seconds that must
94 elapse since CLTT before a ping check is conducted. Prior to this, the
95 value was hard coded at 60 seconds. Please see the server man pages for
96 a more detailed discussion.
99 - A new configuration parameter, ping-timeout-ms (v4 operation only),
100 has been added that allows the user to specify the amount of time
101 the server waits for a ping-check response in milliseconds rather
102 than in seconds (via ping-timeout). When greater than zero, the value
103 of ping-timeout-ms will override the value of ping-timeout. Thanks
104 to Jay Doran from Bluecat Networks for suggesting this feature.
105 [ISC-Bugs #10 git ebe4f7ae427fa91f561a0b6e5f242de08d319a16]
107 Changes since 4.4.1 (Bug Fixes)
109 - Corrected a misuse of the BIND9 DDNS API which caused DDNS updates to be
110 carried out over TCP rather than UDP. The coding error was exposed by
111 migration to BIND9 9.11. Thanks to Jinmei Tatuya at Infoblox for
115 - Bind9 now defaults to requiring python to build. The Makefile for
116 building Bind9 when bundled with ISC DHCP was modified to turn off
118 [ISC-Bugs #3,!1 git cc35f84943df44dac2499f3e16e8aaba7d54191d]
120 - Corrected a dual-stack mixed-mode issue that occurs when both
121 ddns-guard-id-must-match and ddns-other-guard-is-dynamic
122 are enabled and that caused the server to incorrectly interpret
123 the presence of a guard record belonging to another client as
124 a case of no guard record at all. Thanks to Fernando Soto
125 from BlueCat Networks for reporting this issue.
126 [ISC-Bugs #1,!2 git 9ef78585440f568da2a2a0093a8c40c49118e292]
128 - Corrected a compilation issue that occurred when building without DNS
129 update ability (e.g. by undefining NSUPDATE).
130 [ISC-Bugs, #16,!9 git ddb508ac083dae4ff83279dd240bad7f73a97b7d]
132 - Corrected an issue that was causing the server, when running in
133 DHPCv4 mode, to segfault when class lease limits are reached.
134 [ISC-Bugs #13, !7 git #TBD]
136 Changes since 4.4.0 (New Features)
138 Changes since 4.4.0 (Bug Fixes)
140 - A delayed-ack value of 0 (the default), now correctly disables the delayed
141 feature. A change in 4.4.0 prohibited lease updates marking leases active
142 from be written to the lease file when delayed-ack is 0. This in turn,
143 caused servers to lose active lease assignments upon restart.
146 ! Option reference count was not correctly decremented in error path
147 when parsing buffer for options. Reported by Felix Wilhelm, Google
152 ! Corrected an issue where large sized 'X/x' format options were causing
153 option handling logic to overwrite memory when expanding them to human
154 readable form. Reported by Felix Wilhelm, Google Security Team.
158 - Added use of new Bind9 compatibility header files, that are now necessary
159 to supply type definitions for primitive data types, removed from Bind9
160 proper. Altered util/bind.sh to pull from Bind9 repo on gitlab.
164 Changes since 4.4.0b1 (New Features)
166 - Duplicate address detection when binding to a new IPv6 address was added
167 to the following dhclient scripts: linux,freebsd,netbsd,openbsd, and macos.
168 The scripts will check for DAD errors after binding to a new IPv6 address
169 for at most --dad-wait-time seconds. If a DAD error is detected the script
170 will exit with a value of 3, instructing dhclient to decline the address. If
171 dad-wait-time is zero (the default), DAD error checking is not peformed.
174 - Support for sending and receiving additional DHCP4 options has been added
175 to both the dhcpd and dhclient. Specifically: option codes 93,94, and 97
176 (RFC 4578); code 150 (RFC 5859); and codes 209,219, and 211 (RFC 5071).
177 Beyond configuring, sending, requesting, and receiving these options neither
178 server nor client apply any additional logic based on their values.
179 Thanks to Peter Lewis for requesting this change.
182 Changes since 4.4.0b1 (Bug Fixes)
184 - Added clarifying text to dhcpd.conf.5 explaining the class match expressions
185 cannot rely on the results of executable statements.
188 - Fixed a bug which causes dhcpd and dhclient to crash on certain
189 systems when given relative path names for lease or pid files on
190 the command line. Affected systems are those on which the C library
191 function, realpath() does not support a second parameter value of
192 NULL (see manpages for realpath(3)).
195 - Fixed a build issue when building with embedded BIND9 under OpenBSD that
196 was causing BIND9 build to not generate dns/enumclass.h and dns/enumtype.h.
199 - Added <dhcp>/m4/README to the distribution tarball. Some versions of
200 ac_local() treat the absence of the m4 subdirectory as error rather than
201 warning. This was causing the call to autoreconf, necessary for building
202 with libtool, to fail.
205 Changes since 4.4.0a1 (New Features)
207 - Added experimental support for relay port (draft-ietf-dhc-relay-port-10.txt)
208 feature for DHCPv4, DHCPv6 and DHCPv4-over-DHCPv6. Relay port has to be
209 enabled at compile time via --enable-relay-port and is fully backward
210 compatible (i.e. works with previous implementations of servers and relays
211 using the standard ports). A new --rp <relay-port> command line option
212 specifies to dhcrelay an alternate source port for upstream (i.e. toward
213 the server) messages. Thanks to Naiming Shen and Enke Chen of Cisco
214 systems for submitting these patches.
217 - Added --release-on-roam to dhcpd server. When enabled and the server detects
218 that a DHCPv6 client (IAID+DUID) has roamed to a new network, it will release
219 the pre-existing leases on the old network and emit a log statement similar
222 "Client: <id> roamed to new network, releasing lease: <address>"
224 The server will carry out all of the same steps that would normally occur
225 when a client explicitly releases a lease. This behavior is disabled by
226 default and may only be specified globally. Prior to this the server renders
227 the leases unavailable until they expire or the server is restarted. Clients
228 that need leases in multiple networks must supply a unique IAID in each IA.
229 When release-on-roam is disabled (the default) the server maintains the
230 prior behavior of making such leases unavailable until they expire or the
231 server is restarted. Clients that need leases in multiple networks must
232 supply a unique IAID in each IA. This parameter may only be specified at
233 the global level. Thanks to Fernando Soto from BlueCat Networks for
234 suggesting this change.
238 - Support for delayed-ack is now compiled in by default. Prior to this
239 it had to be enabled at compile time via --enable-delayed-acks. The
240 default value for delayed-ack, however, has been changed from 28 to 0
241 (i.e. disabled). This was done to minimize the impact on users not
242 currently using the feature. Please note that the delayed-ack feature
243 is not currently compatible with support for DHPCv4-over-DHCPv6 so
244 when a 4to6 port command line argument enables this in the server the
245 delayed-ack value is reset to 0.
248 - The server (-6) now honors the parameter, update-static-leases, for static
249 (fixed-address6) DHCPv6 leases. It is worth noting that because stateful
250 data is not retained by the server for static leases, each time a client
251 requests or renews a static lease, the server will perform DDNS updates for
252 it. This may have significant performance implications for environments
253 with many clients that request or renew static leases often. Similarly,
254 the DNS entries will not be removed by server when a client issues a RELEASE
255 nor if the lease is deleted from the configuration. In such cases the DNS
256 entries must be removed manually. This feature is disabled by default.
257 Thanks to both Bill Shirley and dgutier-at-cern-dot-ch for requesting
263 - Added to the server (-6) a new statement, local-address6, which specifies
264 the source address of packets sent by the server. An additional flag,
265 bind-local-address6, disabled by default, binds the service socket to
266 to local-address6. Note that bind-local-address does not work with direct
267 clients: a relay has to forward packets to the server using the
268 local-address6 destination.
271 Changes since 4.4.0a1 (Bugs)
273 - The server now recognizes environment variables PATH_DHCPD_DB and
274 PATH_DHCPD_PID. These had been incorrectly compiled out of the code
275 unless DHCPv6 support was disabled. Additionally, the server man
276 pages were corrected to accurately reflect how the server chooses
277 file names (see lease-file-name and pid-file-name statements). Thanks
278 to Fernando Soto at Bluecat Networks for bringing this matter to our
282 - Removed an "Impossible condition" error upon exit in the dhcpd server that
283 has been shutdown via OMAPI. This condition was only apparent under Solaris
284 when building with --enable-use-sockets and --enable-ipv4-pktinfo.
287 - Corrected some minor Coverity issues: CID 1426059, 1426058, and 1426057.
290 - Added missing text to dhclient.8 and expanded release note coverage
291 for --address-prefix-len changes.
293 Changes since 4.3.6 (New Features)
295 - Added --enable-bind-install to install embedded bind includes and
296 libraries. Default is to not install them (it was the previous
297 behavior). If you'd like to change the includedir and/or libdir
298 installation directories to something different than for ISC DHCP
299 you must pass them using the --with-bind-extra-config configuration
303 - Added support of dynamic shared libraries with libtool. A new
304 --enable-libtool configuration parameter is available but
305 should not be used directly: *please* read the build configuration
306 section in the README file for the recommended procedure.
309 - IPv6 operation now supports an EUI-64 based address allocation which will
310 calculate addresses for clients with EUI-64 DUIDs based on those DUIDs when
311 enabled by setting use-eui-64 true. The parameter may defined down to the
312 pool scope. Note this feature must be compiled in by defining EUI_64 in
313 includes/site.h. This flag is undefined by default.
316 - The directory includes/isc-dhcp and it's only occupant, dst.h, have
317 been removed from the source tree. They are obsolete for branches
321 - Replaced ISC licensing with Mozilla Public License, MPL 2.0 licensing
322 throughout. Please see https://www.mozilla.org/en-US/MPL/2.0/ to read
323 the MPL 2.0 license terms.
326 - Load balancing for failover peers can now be disabled by setting
327 "load balance max secs" to 0. Doing so for both peers means both
328 servers will respond to all DHCPDISCOVERs or DHCPREQUESTs as soon as
332 - Added a new dhclient command line parameter, --prefix-len-hint <length>.
333 When used in conjunction with -P, it directs dhclient to use the given
334 length as the prefix length hint when requesting prefixes. Thanks to both
335 Indy, of the FireballISO open source project and H. Peter Anvin for
336 suggesting this change.
342 - dhclient will now wait for 10 seconds after declining an IPv4 address
343 before issuing a discover. This is in keeping with RFC 2131, section 3.1.5.
344 Prior to this dhclient did not wait at all. The amount of time dhclient
345 waits can be specified via a new command line parameter:
346 --decline-wait-time <seconds>. A value of zero equates to no wait at all.
347 Thanks to Pavel Kankovsky for bringing this matter to our attention.
348 **NOTE: THIS IS CHANGE IN DEFAULT BEHAVIOR.
351 - dhclient will now include the lease address when logging DHCPOFFERs,
352 DHCPREQUESTs, DHCPACKs, DHCPRELEASEs, and DHCPDECLINEs. Additionally,
353 DHCPOFFERs will be logged before their corresponding DHCPREQUESTs are
357 - When given the -T command line argument, in addition to reading the
358 current lease file, the server will write the leases to a temporary
359 lease file. This can help detect issues in server configuration that
360 only surface when leases are written to the file. The current lease
361 file will not be modified and the temporary lease file is removed upon
362 completion of the test.
365 - dhclient will now generate a DHCPv6 DECLINE message containing all IA_NA
366 addresses which for which the client script indicates a DAD failure. After
367 receiving the DECLINE reply, dhclient will restart the solicit process.
368 Note, the client script must exit with a value of 3 to signify that the
369 address failed DAD. Thanks to Jiri Popelka of Red Hat for submitting the
370 patch that was the foundation for this change.
371 **NOTE: THIS IS CHANGE IN DEFAULT BEHAVIOR.
376 - Replaced compilation option, enable-secs-byteorder, with a run-time, server
377 configuration parameter, check-secs-byte-order. When enabled, the
378 server will check for clients that do the byte ordering on the secs field
379 incorrectly. This field should be in network byte order but some clients
380 get it wrong. When this parameter is enabled the server will examine the
381 secs field and if it looks wrong (high byte non zero and low byte zero) swap
382 the bytes. The default is disabled. This parameter is only useful when
383 doing load balancing within failover.
386 - The default value for server (-6) parameter, prefix-length-mode, has been
387 changed from "exact" to "prefer". In "prefer" mode the server will offer
388 the first available prefix with the same length as that requested by the
389 client. If none are found then it will offer the first available prefix of
390 any length. This is more in line with with RFC 8168 and should improve
391 the out-of-the-box user experience.
392 **NOTE: THIS IS CHANGE IN DEFAULT BEHAVIOR.
395 - Added support for 'dhcp-cache-threshold' to IPv6 operation: If a client
396 renews before 'dhcp-cache-threshold' percent of its lease has elapsed
397 (default 25%), the server will reuse the allocated lease (provide a
398 lease within the currently allocated lease-time) rather than extend or
399 renew the lease. This allows the server to reply without needlessly
400 writing leases to disk. The preferred and valid lease lifetimes
401 sent to the client will be reduced by the age of the lease. The option
402 may be specified down to the pool level and is supported for all three
403 pool types: NA, TA, and PD.
406 - Added three new server configuration parameters which influence DDNS:
407 1. ddns-dual-stack-mixed-mode - alters DNS conflict resolution behavior
408 to mitigate issues with non-compliant clients in dual stack environments.
410 2. ddns-guard-id-must-match - relaxes the DHCID RR client id matching
411 requirement of DNS conflict resolution.
413 3. ddns-other-guard-is-dynamic - alters dual-stack-mixed-mode behavior to
414 allow unguarded DNS entries to be overwritten in certain cases
419 - A "key-algorithm <algorithm>" statement has been added to omshell to
420 allow the specification of the key algorithm to use during transaction
421 authentication. Prior to this it was hard-coded to be hmac-md5. It now
422 supports all of the same algorithms as the dhcpd server: hmac-md5 (the
423 default), hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384, and hmac-sha512.
426 - Added a server configuration parameter, persist-eui-64-leases, which
427 determines whether or not EUI-64 based leases are written to the
428 leases file. Default is true.
431 - Changed the default value of the prefix length passed by dhclient into the
432 client script for each IPv6 address from 64 to 128. This was done to comply
433 with RFC3315bis draft (-09, page 64) and RFC5942, Section 4, point 1.
434 In addition, dhclient now supports a command line argument,
435 --address-prefix-len, which may be used to override the default value.
436 **WARNING**: This change may not be backwardly compatible with your
437 environment. If you are operating without a router, such as between VMs on
438 a host, you may find they cannot see each with prefix length of 128. In
439 such cases, you'll need to either provide routing or use the command line
440 parameter to set the value to 64. Alternatively you may change the default
441 at compile time by setting DHCLIENT_DEFAULT_PREFIX_LEN in includes/site.h.
445 - Modified dhclient (-6) to bypass sending a confirm (INIT REBOOT) when it has
446 only expired address associations. Thanks to Jiri Popelka at Red Hat for
447 raising the issue and submitting the patch.
449 Changes since 4.3.6 (Bugs):
451 - Corrected an issue where the server would return a client's previously
452 released prefix lease even when the client provides a prefix length
453 hint that does not match the prior lease. Now the server will only
454 return the previous lease if it exactly matches the hint. If not
455 it will attempt to allocate a new prefix based on the hint and the
456 prefix-length-mode. Thanks to Tim DeNike - Lightspeed Communications
457 for pointing out the error of our ways.
460 - Added explicit include of BIND9 isc/util.h to adapt to revisions
461 in BIND9 (see BIND9 ticket #46311). Prior to this the build was failing
462 with implicit function declarations errors for POST() and INSIST().
465 - Added to code ignore empty IPv4 host name option (code 12). While RFC 2132
466 states the option cannot be empty, some clients are apparently capable of
467 sending it. Prior to this the server was attempting to use it and store it
468 in the lease file causing issues with DDNS and so forth.
471 - Corrected dhclient command line parsing for --dad-wait-time that causes
472 even valid values to fail as invalid on some environments.
475 - Replaced iasubopt::heap_index with separate values for active and inactive
476 heaps: iasubopt::active_index and iasubopt::inactive_index. This was done
477 to accommodate a change in behavior in BIND9 isc_heap_delete().
480 ! Plugged a socket descriptor leak in OMAPI, that can occur when there is
481 data pending to be written to an OMAPI connection, when the connection
482 is closed by the reader. Thanks to Pavel Zhukov at RedHat for bringing
483 this issue to our attention and whose patch helped guide us in the right
487 - The ability of the server to send back dhcp6.vendor-opts values has been
488 restored. A change in 4.3.5 (see #29246) which enabled it to send back the
489 FQDN option unfortunately broke its ability send back dhcp6.vendor-opts.
490 Thanks to Sumant Gupta (sumantgupta at gmail dot com) of Landis+Gry for
491 bringing this issue to our attention.
494 Changes since 4.3.6b1
500 - The server now allows the client identifier (option 61) to own leases
501 in more than one subnet concurrently. Prior to this the server would
502 incorrectly release an existing lease in one subnet prior to assigning
503 a lease in another subnet. Note that the prior behavior can be still
504 be achieved by enabling one-lease-per-client. Thanks to both David Zych at
505 the University of Illinois and Norm Proffitt of Infoblox for reporting
506 the issue; and Norm for suggesting a solution.
509 - When replying to a DHCPINFORM, the server will now include options specified
510 at the pool scope, provided the ciaddr field of the DHCPINFORM is populated.
511 Prior to this the server only evaluated options down to the subnet scope.
512 Thanks to Fernando Soto at BlueCat Networks for reporting the issue.
516 - When memory allocation fails in a repeated way the process writes
517 "Run out of memory." on the standard error and exists with status 1.
520 - The new lmdb (Lightning Memory DataBase) bind9 configure option is
521 now disabled by default to avoid the presence of this library to be
522 detected which can lead to a link failure.
525 - The linux interface discovery code has been modified to use getifaddrs()
526 as is done for BSD and OS-X. Prior to this the code would only recognize
527 the first address on an interface and thereby omit vlans.
528 Thanks to Jiri Popelka at Redhat, Marius Tomaschewski at SUSE, and Wei
529 Kong at Novell, who all submitted patches.
536 - Fixed a bug in OMAPI that causes omshell to crash when a name-value
537 pair with a zero length value is shipped in an object. Thanks to
538 Fernando Soto at BlueCat Networks for reporting the issue and
542 - On 64-bit platforms, dhclient now generates the correct value for the
543 script environment variable, "expiry", the lease expiry value exceeds
544 0x7FFFFFFF. Prior to this such values would produce negative values
545 for expiry in the script environment.
548 - Common timer logic was modified to cap the maximum timeout values at
549 0x7FFFFFFF - 1. Values larger than that were causing fatal timer out of
550 range errors on 64-bit platforms. Thanks to Jiri Popelka at Red Hat for
554 - DHCP6 FQDN option unpacking code now correctly handles values that contain
555 spaces, special, or non-printable characters. Prior to this the buffer
556 size needed was underestimated causing a conversion error message to
557 be logged and DNS updates to be skipped. Thanks to Fernando Soto at
558 BlueCat Networks for bringing the matter to our attention.
561 - When running in -6 mode, dhclient can enforce the require option statement
562 and will discard offered leases that do not contain all the required
563 options specified in the client configuration. If not enabled the client
564 will still consider such leases. This must be enabled at compile time
565 (see ENFORCE_DHCPV6_CLIENT_REQUIRE in includes/site.h). Thanks to
566 Mritunjaykumar Dubey at Nokia for reporting the issue.
569 - Altered DHCPv4 lease time calculation to avoid roll over errors on 64-bit
570 OS systems when using -1 or large values for default-lease-time. Rollover
571 values will be replaced with 0x7FFFFFFF - 1. This alleviates unintentionally
572 short expiration times being handed out when infinite lease times (-1) in
573 conjunction with failover. Our thanks to Alessandro Gherardi for bringing
574 the issue to our attention.
577 - Added new compile time option --with-srv-conf-file which specifies a
578 default location of the server configuration file.
581 - Added --dad-wait-time parameter to dhclient. It specifies the maximum time,
582 in seconds, that the client process should wait for the duplicate address
583 detection to complete before initiating DHCP requests. This value is
584 propagated to the dhclient script and the script is responsible for waiting
585 the specified amount of time or until DAD has completed. If the script does
586 not support it, specifying this parameter has no effect. The default value
587 is 0 which specifies that the script should not wait for DAD. With this
588 change the following scripts have been modified to support the new parameter:
589 freebsd, linux, macos, netbsd, openbsd.
592 - The server nows checks both the address and length of a prefix delegation
593 when attempting to match it to a prefix pool. This ensures the server
594 responds properly when pool configurations change such that once valid,
595 "in-pool" delegations are now treated as being invalid. During lease
596 file loading at startup, the server will discard any PD leases that
597 are deemed "out-of-pool" either by address or mis-matched prefix length.
598 Clients seeking to renew or rebind such leases will get a response of
599 No Binding in the case of the former, and the prefix delegation with
600 lifetimes set to zero in the case of the latter. Thanks to Mark Nejedlo
601 at TDS Telecom for reporting this issue.
604 - Modified DDNS support initialization such that DNS related ports will only be
605 opened by the server (dhcpd) at startup if ddns-update-style is not "none";
606 by dhclient only if and when the it first attempts an update; and never by
607 dhcrelay. Prior to this all three always did the initialization at startup
608 which causes them to always open on and listen for traffic on two random
609 ports. Thanks to Rodney Beede for reporting this issue.
613 - Added error logging to two memory allocation failure checks. Thanks to Bill
614 Parker (wp02855 at gmail dot com) for reporting the issue.
617 - Corrected a dhclient -6 issue that caused the client to crash with an
618 "Impossible condition" error after de-preferencing its only IA binding.
619 The crash occurred when server configuration changes rendered the existing
620 binding out-of-range and no other leases were available to offer. Thanks
621 to Pierre Clerissi for bringing this issue to our attention.
624 - By defining CALL_SCRIPT_ON_ONETRY_FAIL in includes/site.h, dhclient will
625 now call the script with reason set to FAIL when run with -1 (one try) and
626 there are no server responses. This applies to IPv4 mode only. Thanks for a
627 patch by Martin Pitt which got to us via Andrew Pollock.
630 - The server now detects failover peers that are not referenced in at least
631 one pool when run with the command line option for test mode, -T. Prior to
632 this the check was performed too far down stream to be detected in test mode.
635 - Linux script updated. The script is now based on Debian version. It uses
636 ip tool from iproute2 package and ifconfig is no longer used. This also
637 addresses an issue of calling arping with inappropriate parameter.
641 - Changed severity of the log message indicating UDP checksum errors in
642 the received packets from 'info' to 'debug' to avoid logging excessive
643 number of false positives when UDP checksum offloading is enabled.
646 - The directory minires has been removed from the source tree. It has
647 long been obsolete for branches other than v4_1_esv. Additionally,
648 includes/minires.h was renamed includes/ns_name.h.
651 - Replaced ifconfig parameters "add" and "delete" with "alias" and "-alias"
652 for IPv6 mode in the client scripts, netbsd and openbsd. This was
653 preventing IPv6 addresses from being added or removed from interfaces.
654 Thanks to Tim Dean for reporting this issue.
657 Changes since 4.3.5b1
659 - Corrected a bug which could cause the server to sporadically crash while
660 loading lease files with the lease-id-format is set to "hex". Our thanks
661 to Jay Ford, University of Iowa for reporting the issue.
664 - Eliminated a noisy, but otherwise harmless debug log statment that may
665 appear during server startup when building with --enable-binary-leases
666 and configuring multiple pools in a shared network. Thanks to Fernando
667 Soto from BlueCat Networks for reporting the issue and supplying a patch.
672 - Fixed util/bindvar.sh error handling.
675 - Correct error message in relay to use remote id length instead
676 of circuit id length.
679 - Add logic to test directory Makefiles to avoid copying Attfile(s)
680 when building within the source tree. This eliminates a noisy but
681 otherwise harmless error message when running "make check".
684 - Leases are now scrubbed of certain prior use information when pool
685 re-balancing reassigns them from one FO peer to the other. This
686 corrects an issue where leases that were offered but not used
687 by the client retained the client hostname from the original
688 client. Thanks to Pavel Polacek, Jan Evangelista Purkyne University
689 for reporting the issue.
692 - In the LDAP code and schema add some missing '6' characters to use
693 the v6 instead of the v4 versions. Thanks to Denis Taranushin for
694 reporting this issue and supplying its patch.
697 - Correct how the pick-first-value expression is written to a lease
698 file. Previously it was written as a concat expression due to
699 a cut and paste error.
702 - Modify the DDNS code to clean up the PTR record even if there
703 are issues while cleaning up the A or AAAA records.
706 - Added global configuration parameter, abandon-lease-time, which determines
707 the amount of time a lease remains abandoned. The default is 84600 seconds.
708 Additionaly, the server now conducts a ping check (if ping checks are
709 enabled) prior to offering an abandoned lease to client. Our thanks to
710 David Zych at University of Illinois for reporting the issue and working
711 with us to produce a viable solution.
714 - Correct handling of interface names during interface discovery. This
715 addresses an issue where interface names of 15 characters in length
716 could lead to crashes or interface recognition errors during startup
717 of dhcpd, dhclient, and dhcrelay.
720 - Updates to contrib/dhcp-lease-list.pl to make it more friendly.
721 The updates are: looking for the lease file in more places and skipping
722 the "processing complete" output when creating machine readable
723 output. Thanks to Cameron Paine (cbp at null dot net) for the
727 - When reusing a lease for dhcp-cache-threshold return the hostname
728 to the original lease. Also if the host pointer, UID or hardware address
729 change don't allow reuse of the lease.
730 Thanks to Michael Vincent for reporting this and helping us
731 verify the problem and fix.
734 - Change dmalloc to use a size_t as the length argument to bring it
735 in line with the call it will make to malloc().
738 - If the failover socket can't be bound, close it. Otherwise if the
739 user configures an incorrect address in the failover stanza the
740 server will continue to open new sockets every 90 seconds until
744 - Add DHCPv4-mode, dhcrelay command line options, "-iu" and "-id", that
745 allow interfaces to be upstream or downstream respectively. Upstream
746 interfaces will accept and forward only BOOTP replies, while downstream
747 interfaces will accept and forward only BOOTP requests.
750 - Clean up some memory references in the vendor-class construct.
753 Changes since 4.3.4b1
759 - Corrected a static analyzer warning in common/execute.c
762 - ISC DHCP now follows the common convention to use the base name a
763 program is invoked with (aka argv[0], vs. a builtin name) for
764 logs. This should help differentiate syslog entries for DHCPv4 and
765 DHCPv6 servers. You can define OLD_LOG_NAME in includes/site.h to
766 keep the previous behavior.
769 - The Linux packet filter code now correctly treats only the least significant
770 12 bits in an inbound packet's TCI value as the VLAN id (per IEEE 802.1Q).
771 Prior to this it was using the entire 16 bit value as the VLAN id and
772 incorrectly discarding packets. Thanks to Jiri Popelka at Red Hat for
773 reporting this issue and supplying its patch.
776 - Fixed several static analysis issues such as potential null
777 references, unchecked strdup returns. Thanks to Bill Parker (wp02855 at
778 gmail dot com) who identified these issues and supplied patches to
783 - Corrected compilation errors that prohibited building the server
784 and its ATF unit tests when failover is disabled.
787 - Added the lease address to the end of the debug level log message
788 emitted when an existing lease is renewed within the dhcp-cache-threshold.
789 Thanks to Nathan Neulinger at Missouri S&T for suggesting the change.
792 - Added dhcpv6 and delayed-ack to settings listed in the "Features:"
793 section of the configure script output. Additionally, all of the
794 features reported on will now always show either a "yes" or "no"
795 value. Prior to this features left to their default setting would
799 - Added a parameter, authoring-byte-order, to the lease file. This value
800 is automatically added to the top of new lease files by the server and
801 indicates the internal byte order (big endian or little endian) of the
802 server. This permits lease files generated on a server with one form of
803 byte order to be used on a server with the opposite form. Our thanks to
804 Timothe Litt for calling this to our attention and for the suggestions
808 - Fixed a small memory leak in the DHCPv6 version of the client code.
809 This is unlikely to cause significant issues in actual use.
812 - Corrected a few minor memory leaks in omapi's dereferencing of
813 host objects. Thanks to Jiri Popelka at Red Hat for reporting
814 the issue and supplying the patches.
818 - Cleaned up some of the Make infrastructure to make --with-libbind
819 work better. Though it still only works with an absolute path.
822 - Made the embedded bind libraries able to be cross compiled
823 (please refer to the bind9 documentation to learn how to cross
824 compile DHCP and its bind library dependency).
827 - Update the client code to better support getting IA_NAs and IA_PDs
828 in the same packet, see RFC7550 for some discussion.
831 ! Update the bounds checking when receiving a packet.
832 Thanks to Sebastian Poehn from Sophos for the bug report and a suggested
837 - When handling an incorrect command line for dhcpd, dhclient or dhcrelay
838 print out a specific error message about the first error in addition
839 to the usage string. This may be disabled by editing includes/site.h.
843 - The configure script will now exit with an error message if it cannot find
844 a GNU-style make tool (needed when building BIND libraries) or pkg-config
845 (needed to locate ATF used for building unit tests). Prior to this the
846 script would exit indicating success causing subsequent attempts to build
847 the software to fail.
850 - Properly terminate strings before passing them to regex and fix
851 a boundary error when creating certain new data strings.
852 Thanks to Andrey Jr. Melnikov for the bug report.
855 - Option expressions, such as prepend and append, are now supported when
856 running dhclient for IPv6. Prior to this such statements in the
857 client configuration file would be parsed but have no affect. Thanks
858 to Jiri Popelka at Red Hat for reporting the issue.
861 - A failover primary server will now accept a binding status update from the
862 secondary which transitions a lease from ACTIVE to ABANDONED. This accounts
863 for instances in which a client declines a lease and only the secondary
864 server receives it. Prior to this the primary server would reject such an
865 update as an "invalid state transition".
868 - Properly allocate memory for a bpf filter.
869 Thanks to Bill Parker (wp02855 at gmail dot com) who identified this issue.
872 - Updated contrib/dhcp-lease-list.pl to handle garbage in the oui file better
873 and to print out the hostnames a bit better.
874 Thanks to Antoine Beaupré from Debian for the suggested patch.
877 - The DHCPv6 server now handles long valid and preferred lease times better.
878 Values that would cause the internal end time of the lease to wrap are
879 modified to work as infinite.
882 - Updated support for cross compiling by allowing the library archiver
883 to be set at configure time via the environment variable 'AR'.
886 - The server will now match DHCPv6 relayed clients to host declarations
887 which include the "hardware" statement, if the relay connected to the
888 client supplies the client's hardware address via client-linklayer-address
889 option as per RFC 6939.
892 - Allow a filename to be specified instead of /dev/random during
893 configuration. This is passed to the BIND configuration to allow
894 for cross compilation.
897 - Add more option definitions.
900 - Correct outputting of long lines in the lease file when writing
901 a lease that includes long strings in an execute statement.
904 - The server will now correctly treat a lease as reserved when the client
905 requests an infinite lease time (i.e. OxFFFFFFFF) and "infinite-is-reserved"
906 is enabled. Prior to this the server would halt. In addition, corrections
907 were made to the server to allow a lease's flags field to be set via omapi.
908 Prior to this, the server, depending on the host architecture, would
909 incorrectly parse the new flags value from the omapi message.
912 - ISC DHCP can now be configured and built from a directory other than
913 the top level source directory. Note that "make distcheck" uses this
917 - Add support for RFC 3527 to dhcrelay. A new, dhcrelay command line argument,
918 "-U <interface>" enables the addition of a RFC 3527 compliant link selection
919 suboption to the agent option added for clients directly connected to the
924 - Add a new global DHCPv6 option, dhcpv6-set-tee-times, which when enabled
925 instructs the server to calculate T1 and T2 as recommended in RFC 3315,
929 - Corrected minor Coverity issues.
932 - Add support for RFC 7341 DHCPv4 over DHCPv6 with a new configuration
933 option "--enable-dhcpv4o6". Note this feature requires DHCPv6 support
934 and is not compatible with delayed-ack. Both client and server use 2
935 processes which communicate over UDP on a pair of sockets. The new
936 "-4o6 <port>" command line argument enables DHCPv4 over DHCPv6 support
937 and specifies the consecutive ports to use for inter-process communication.
938 Please look at doc/DHCPv4-over-DHCPv6 for more details.
941 - Correct interface name formation when using DLPI under Solaris 11. As of
942 Solaris 11, ethernet device files are located in "/dev/net". The configure
943 script has been modified to detect this situation and adjust the directory
944 used accordingly. Thanks to Jarkko Torppa for reporting this issue and
949 - Add a dereference call when handling an error condition while
953 - Add a new parameter, lease-id-format, to both dhcpd and dhclient. The
954 parameter controls the format in which certain values are written to lease
955 files. Formats supported are octal - quoted string containing octal
956 escapes, and hex - unquoted, colon separated hex digits. Thanks to
957 Jay Ford, University of Iowa for bringing the issue to our attention.
960 ! Add an option in site.h to limit the number of failover and control
961 connections the server will accept. By default this is 200.
965 Changes since 4.3.3b1
971 - The server now does a better check to see if it can allocate the memory
972 for large blocks of v4 leases and should provide a slightly better error
973 message. Note well: the server pre-allocates v4 addresses, if you use
974 a large range, such as a /8, the server will attempt to use a large
975 amount of memory and may not start if there either isn't enough memory
976 or the size exceeds what the code supports.
979 - The server will now reject unicast Request, Renew, Decline, and Release
980 messages from a client unless the server would have sent that client the
981 dhcp6.unicast option. This behavior is in compliance with paragraph 1 in
982 each of the sections 18.2,1, 18.2.3, 18.2.6, and 18.2.7 of RFC 3315. Prior
983 to this, the server would simply accept the messages. Now, in order for
984 the server to accept such a message, the server configuration must include
985 the dhcp6.unicast option either globally or within the shared network to
986 which the requested lease belongs. In other words, the server will map
987 the first IA_XX address found within the client message to a shared-network
988 and look for the presence of the unicast option there and then globally.
989 Thanks to Jiri Popelka at Red Hat for this issue and his patch which
993 - The ATF (Automated Testing Framework) tools used for optional unit tests
994 can now be built from its embedded sources in bind, solving the
995 atf-run / atf-report issue with recent (>= 0.20) versions of ATF.
996 The new configuration option is "./configure --with-atf=bind".
997 [ISC-Bugs #38754, #39300]
999 - Corrected a compilation error introduced by the fix for ISC-Bugs #22806.
1000 On older linuxes that do not include the tpacket_auxdata structure don't
1001 bother allocating the cmsgbuf as it isn't necessary and we don't have
1002 a proper length for it.
1005 - Remove the dst directory. This was replaced in 4.2.0 with the dst
1006 code from the Bind libraries but we continued to include it for
1007 backwards compatibility. As we have now released 4.3.x it seems
1008 reasonable to remove it.
1011 - Write out the DUID server id on startup in all cases, previously if it
1012 was read in from server-duid option in the config or lease files for
1013 DHCPv4 it would not be written to the new lease file.
1016 - When parsing dates for leases convert dates past 2038 to "never".
1017 This avoids problems with integer overflows in the date and time
1018 handling code for people that decide to use very large lease times
1019 or add a lease entry with a date far in the future.
1022 - Leave the siaddr field clear when sending a NACK as per RFC 2131
1026 - In the client don't send expired addresses to the script as part of
1027 the binding process. Thanks to Sven Trenkel at Google for reporting
1028 the issue and suggesting the patch.
1031 - While parsing IPv6 addresses treat "add" as part of the address instead
1035 - Add support for accessing the v4 lease queues (active, free etc) in a
1036 binary fashion instead of needing to walk through a linear list to
1037 insert, find or remove an entry from the queues. In addition add a
1038 compile time option "--enable-binary-leases" to enable the new code
1039 or to continue using the old code. The old code is the default.
1040 Thanks to Fernando Soto from BlueCat Networks for the patch.
1043 - Delayed-ack now works properly with Failover. Prior to this, bind updates
1044 post startup were being queued but never delivered. Among other things, this
1045 was causing leases to not transition from expired or released to free.
1048 - Clean up parsing of v6 lease files a bit to avoid infinite loops if the
1049 lease file is corrupt in certain ways.
1052 - Corrected a crash in dhclient that occurs during lease renewal if the
1053 client is performing its own DNS updates. Thanks to Jiri Popelka at Red Hat
1057 - Corrected an issue in v6 lease file parsing. Prior to this, when encountering
1058 a lease with an address for which no configured pool exists, the server was
1059 declaring the lease file corrupt and incorrectly skipping over the subsequent
1060 entry in the file. The server will now emit a log message indicating that
1061 no pool was found for the address (or prefix) and correctly resume parsing
1062 with the next entry in the lease file. Our thanks to Michal Žejdl for
1063 reporting the issue.
1066 - Be more liberal in finding a subnet group associated with a static
1067 prefix. When we added the class matching code for v6 we also added
1068 a requirement that the static prefix must be within a subnet the
1069 client was in, in order to find the proper statements. We now
1070 look for a subnet based on the prefix, failing that on the static
1071 address for the client and failing that on the shared network
1075 - Add a new action expression "parse_vendor_options", which can be used
1076 to parse a vendor-encapsualted-option received by the server based on
1077 the encoding specified by the vendor-option-space statement.
1080 - Enhance the PARANOIA patch to include fchown() the lease file to
1081 allow it to be manipulated after the server does a chown().
1082 Thanks to Jiri Popelka at Red Hat for the patch.
1085 - Relax the requirement that prefix pools must be within the subnet.
1086 This was added in as part of #32453 in order to avoid configuration
1087 mistakes but is being removed as prefixes aren't required to be
1088 within the same subnet and many people configure them in that fashion.
1091 - Fixed a server crash that could occur when the server attempts to remove
1092 the billing class from the last lease billed to a dynamic class after said
1093 class has been deleted. Our thanks to Lasse Pesonen for reporting the
1097 - LDAP Patches - Numerous small patches submitted by contributors have
1098 been applied to the contributed code which supplies LDAP support.
1099 In addition, two larger submissions have also been included. The
1100 first adds support for IPv6 configuration and the second provides
1101 GSSAPI authentication. We would like to thank the following for their
1102 contributions (alphabetically):
1104 Bill Parker (wp02855 at gmail dot com)
1105 Jiri Popelka at Red Hat
1106 Marius Tomaschewski at SUSE
1107 (william at adelaide.edu.au), The University of Adelaide
1123 - Handle an out of memory condition in the client a bit better.
1124 Thanks to Frédéric Perrin from Brocade for finding the issue
1125 and suggesting a patch.
1128 Changes since 4.3.2rc2
1131 Changes since 4.3.2rc1
1133 - Corrected a compilation error introduced by the fix for ISC-Bugs #37415.
1134 The error occurs on Linux variants that do not support VLAN tag information
1135 in packet auxiliary data. The configure script now only enables inclusion
1136 of the VLAN tag-based logic if it is supported by the underlying OS.
1139 Changes since 4.3.2b1
1141 - Specifying the option, --disable-debug, on the configure script command line
1142 now disables debug features. Prior to this, specifying --disable-debug
1143 incorrectly enabled debug features. Thanks to Gustavo Zacarias for reporting
1147 - Unit test execution now uses a path augmented during configuration
1148 processing of the --with-atf option to locate ATF runtime tools, atf-run
1149 and atf-report. For most installations of ATF, this should alleviate the
1150 need to manually include them in the PATH, as was formerly required.
1151 If the configure script cannot locate the tools it will emit a warning,
1152 informing the user that the tools must be in the PATH when running unit
1154 Secondly, please note that "make check" will now exit with a failure status
1155 code (non-zero) if one or more unit tests fail. This means that invoking
1156 "make check" from an upper level directory will cause the make process to
1157 STOP after the first test subdirectory with failed test(s). To force all
1158 tests in all subdirectories to run, regardless of individual test outcome,
1159 use the command "make -k check".
1164 - Corrected parser's right brace matching when a statement contains an error.
1167 - TSIG-authenticated dynamic DNS updates now support the use of these
1168 additional algorithms: hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384,
1172 - Added check for invalid failover message type. Thanks to Tobias Stoeckmann
1173 working with the OpenBSD project who spotted the issue and provided the
1177 - Corrected rate limiting checks for bad packet logging. Thanks to Tobias
1178 Stoeckmann working with the OpenBSD project who spotted the issue and
1182 - Log statements depicting what files will be used by the server now occur
1183 after the configuration file has been processed.
1186 - Addressed Coverity issues reported as of 07-31-2014:
1187 [ISC-Bugs #36712] Corrects Coverity reported "high" impact issues.
1188 [ISC-Bugs #36933] Corrects Coverity reported "medium" impact issues
1189 [ISC-Bugs #37708] Fixes compilation error in dst_api.c seen in older
1190 compilers that was introduced by #36712
1192 - Server now supports a failover split value of 256.
1195 - Remove unneeded error #defines. These defines were included in case
1196 external programs required the older versions of the macro. They
1197 have been #ifdeffed for now and will be removed at a future date.
1198 See site.h for the #define to include them again, but you should
1199 switch to using the DHCP_R_* versions instead of the ISC_R_* versions.
1200 Also ISC_R_MULTIPLE has been removed as it is also defined in bind.
1203 - Added checks in range6 and prefix6 statement parsing to ensure addresses
1204 are within the declared subnet. Thanks to Jiri Popelka at Red Hat for the
1205 bug report and patch.
1212 - Addressed checksum issues:
1213 Added checksum readiness check to Linux packet filtering which eliminates
1214 invalid packet drops due to checksum errors when checksum offloading is
1215 in use. Based on dhcp-4.2.2-xen-checksum.patch made to the Fedora project.
1222 Inbound packets with UDP checksums of 0xffff now validate correctly rather
1227 - Added the echo-client-id configuration parameter to the server configuration.
1228 The server now supports RFC 6842 compliant behavior by setting a new
1229 configuration parameter, echo-client-id. When enabled, the server will
1230 include the client identifier option (Option code 61) if received, in its
1231 responses. The server identifier returned in NAKs (if enabled) will now
1232 be the globally defined value (if one) if the server cannot attribute the
1233 inbound request to a known subnet.
1237 - Added support of the configuration parameter, use-host-decl-names, to
1238 BOOTP request handling.
1241 - Added logic to ignore the signal, SIGPIPE, which ensures write failures
1242 will be delivered as errors rather than as SIGPIPE signals on all OSs.
1243 Thanks to Marius Tomaschewski from SUSE who reported the issue and provided
1244 the patch upon which the fix is based.
1247 - In the failover code, handle the case of communications being interrupted
1248 when the servers are dealing with POTENTIAL-CONFLICT. This patch allows
1249 the primary to accept the secondary moving from POTENTIAL-CONFLICT to
1250 RESOLUTION-INTERRUPTED as well as handling the bind update process better.
1251 In addition the code to resend update or update all requests has been
1252 modified to send requests more often.
1256 - By default, the server will now choose the value to use in the forward DNS
1257 name from the following in order of preference:
1259 1. FQDN option if provided by the client
1260 2. Host name option if provided by the client
1261 3. Configured option host-name if defined
1263 As before, this may be overridden by defining ddns-hostname to the desired
1264 value (or expression). In addition, the server logic has been extended to
1265 use the value of the host name declaration if use-host-decl-names is enabled
1266 and no other value is available.
1269 - DNS updates were being attempted when dhcp-cache-threshold enabled the use of
1270 the existing lease and the forward DNS name had not changed. This has been
1275 - Corrected an issue which caused dhclient to incorrectly form the result when
1276 prepending or appending to the IPv4 domain-search option, received from the
1277 server, when either of the values being combined contain compressed
1281 - Added the server-id-check parameter to the server configuration.
1282 This parameter allows run-time control over whether or not a server,
1283 participating in failover, verifies the dhcp-server-identifier option in
1284 DHCP REQUESTs against the server's id before processing the request.
1285 Formerly, enabling this behavior was done at compilation time through
1286 the use of the #define, SERVER_ID_CHECK, which has been removed from site.h
1287 The functionality is now only available through the new runtime parameter.
1290 - During startup, when the server encounters a lease whose binding state is
1291 FTS_BACKUP but whose pool has no configured failover peer, it will reset the
1292 lease's binding state to FTS_FREE. This allows the leases to be reclaimed
1293 by the server after a pool's configuration has changed from failover to
1294 standalone. Prior to this such leases would remain stuck in the backup state
1295 making them unavailable for assignment. Note this conversion will occur
1296 whether or not the server is compiled for failover.
1299 - Fixed a small issue in the treatment of hosts in the inform processing
1300 that could cause the response to an inform to include information from
1301 the wrong scope. The two examples we've heard of are getting subnet
1302 instead of group information associated with a host entry, or getting
1303 global information instead of subnet if the host entry was built via
1304 omapi. Thanks to Julien Soula at University of Lille for finding the
1305 bug and supplying a patch.
1308 - Avoid calling pool_timer() recursively from supersede_lease(). This could
1309 result in leases changing state incorrectly or delaying the running of the
1310 leae expiration code.
1313 - Move the check for a PID file and process to be before we rewrite the
1314 lease file. This avoids the possibility of starting a second instance
1315 of a server which changes the current lease file confusing the first
1316 instance. This check is only included if the admin hasn't disabled PID
1321 - In the client code change the way preferred_life and max_life are printed
1322 for environment variables to be unsigned rather than signed.
1323 Thanks to Jiri Popelka at Red Hat for the bug report and patch.
1326 - Modified Linux packet handling such that packets received via VLAN are now
1327 seen only by the VLAN interface. Prior to this, such packets were seen by
1328 both the VLAN interface and its parent (physical) interface, causing the
1329 server to respond to both. Note this remains an issue for non-Linux OSs.
1330 Thanks to Jiri Popelka at Red Hat for the patch.
1336 - Log content has been changed to more directly suggest that admins should
1337 check for multiple IPv6 clients attempting to use the same DUID when only
1338 abandoned addresses are available. Debug level logging will now emit counts
1339 of the total number of, in-use, and abandoned addresses in a shared subnet
1340 when the server finds no addresses available for a given DUID. Lastly,
1341 threshold logging is now automatically disabled for shared subnets whose
1342 total number of possible addresses exceeds (2^64)-1.
1346 - Added a global parameter, prefix-length-mode, which may be used to determine
1347 how the server uses a non-zero value for prefix-length supplied by clients
1348 when soliciting DHCPv6 prefixes. The server supports selection modes of:
1349 ignore, prefer, exact, minimum and maximum which are described in detail in
1350 the server man pages. The prior behavior of the server was to only offer a
1351 prefix whose length exactly matched the prefix-length value requested. If
1352 no such prefixes were available, the server returned a status of none
1353 available. Note the default mode, "exact", provides this same behavior.
1357 - Corrected inconsistencies in dhcrelay's setting the upper interface hop count
1358 limit such that it now sets it to 32 when the upstream address is a multicast
1359 address per RFC 3315 Section 20. Prior to this if the -u argument preceded
1360 the -l argument on the command line or if the same interface was specified
1361 for both; the logic to set the hop limit count for the upper interface was
1362 skipped. This caused the hop count limit to be set to the default value
1363 (typically 1) in the outbound upstream packets.
1366 Changes since 4.3.1b1
1368 - Modify the linux and openwrt dhclient scripts to process information
1369 from a stateless request. Thanks to Jiri Popelka at Red Hat for the
1370 bug report and patch.
1373 - Remove more unused RCSID tags. These weren't noticed in 4.3 as
1374 the code isn't used anymore but we remove them here to keep the
1375 code consistent across versions.
1380 - Tidy up several small tickets.
1381 Correct parsing of DUID from config file, previously the LL type
1382 was put in the wrong place in the DUID string.
1384 Add code to parse "do-forward-updates" as well as "do-forward-update"
1385 Thanks to Jiri Popelka at Red Hat.
1387 Remove log_priority as it isn't currently used.
1389 Increase the size of the buffer used for reading interface information.
1392 - Remove an extra set of the msg_controllen variable.
1395 - Add a more understandable error message if a configuration attempts
1396 to add multiple keys for a single zone. Thanks to a patch from Jiri
1400 - Fix some minor issues in the dst code.
1403 - Properly #ifdef functions so that the code can compile without NSUPDATE.
1406 - Update the partner's stos (start time of state, basically when we last
1407 heard from this partner) field when updating the state in failover.
1410 - Modify the overload processing to allow space for the remote agent ID.
1412 Handle the ordering of the SUBNET_MASK option even if it is the last
1416 - Remove the code that allows a server to follow RFC3315 instead of
1417 the subsequent errata from August 2010 when determining which IAs
1418 to include if no addresses will be assigned.
1421 - Remove unused RCSID tags.
1424 - Correct the v6 client timing code. When doing the timing backoff
1425 for MRT limit it to MRD.
1426 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
1429 - Add a log entry when killing a client and remove the PID files
1430 when a server, relay or client are killed.
1434 - Some minor cleanups in the client code.
1435 In addition to checking for dhcpc check for bootpc in the services list.
1437 Correct the client code to only try to get a lease once when the
1438 given the "-1" argument.
1439 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
1441 When asked for the version don't send the output to syslog.
1443 Add the next server information to the environment variables for
1444 use by the client script. In order to avoid changing the client
1445 lease file the next server information isn't written to it.
1446 Thanks to Tomas Hozza at Red Hat for the suggestion and a prototype fix.
1449 - Several updates to the dhcp server code.
1450 When not in quiet mode print out the files being used.
1452 As accessing some pid files may require privileges move the dropping
1453 of permission bits due to the paranoia patch to be after the pid code.
1454 Thanks to Jiri Popelka at Red Hat for the bug report and fix.
1456 When processing a "--version" request don't output the version information
1459 - Add the "enable-log-pid" build option to the configure script. When enabled
1460 this causes the client, server and relay programs to include the PID
1461 number in syslog messages.
1462 Thanks to Marius Tomaschewski for the suggestion and proto-patch.
1465 - Add a #define to specify the prefix length used when a client attempts
1466 to configure an address. This can be modified by editing includes/site.h.
1467 By default it is set to 64. While 128 might be a better choice it would
1468 also be a change for currently running systems, so we have left it at 64.
1471 - Add a run time option to the client "-df" to allow the administrator to
1472 point to a second lease file the client can search for a DUID. This can
1473 be used to allow a v4 and a v6 instance of the client to share a DUID.
1474 The second file will only be searched if there isn't a DUID in the main
1475 lease file and the DUID will be written out to the main lease file.
1478 - Have the client fsync the lease file to avoid lease corruption if the
1479 client hibernates or otherwise shuts down.
1482 - Add a check for L2VLAN in bpf.c to help support VLAN interfaces
1483 Thanks to Steinar Haug for the suggestion.
1486 - Modify the handling of the resolv.conf file to allow the DHCP
1487 process to start up even if the resolv.conf file has problems.
1490 - Add threshold logging functionality. Two new options,
1491 log-threshold-low and log-threshold-high, indicate to the
1492 server if and when it should log an error message as addresses
1496 - Add code to properly dereference a pointer in the dhclient code
1497 on an error condition.
1500 - Add code to help clean up soft leases.
1503 - Disable the gentle shutdown functionality until we can determine
1504 the best way to present it to remove or reduce the side effects.
1507 Changes since 4.3.0rc1
1510 Changes since 4.3.0b1
1512 - Tidy up receive packet processing.
1513 Thanks to Brad Plank of GTA for reporting the issue and suggesting
1517 Changes since 4.3.0a1
1519 - Modify the message displayed when a process hits a fatal error.
1520 The new message is much shorter and simply points to the README
1521 and our website for directions on bug submissions.
1524 Changes since 4.2.0 (new features)
1526 - If a client renews before 'dhcp-cache-threshold' percent of its lease
1527 has elapsed (default 25%), the server will reuse the allocated lease
1528 (provide a lease within the currently allocated lease-time) rather
1529 than extend or renew the lease. This absolves the server of needing
1530 to perform an fsync() operation on the lease database before reply,
1531 which improves performance. [ISC-Bugs #22228]
1532 Updated this patch to support asynchronous DDNS. If the server is
1533 attempting to do DDNS on a lease it should be updated and written to
1534 disk even if that wouldn't be necessary due to the thresholding.
1537 - The 'no available billing' log line now also logs the name of the last
1538 matching billing class tried before failing to provide a billing.
1541 - A problem with missing get_hw_addr function when --enable-use-sockets
1542 was used is now solved on GNU/Linux, BSD and GNU/Hurd systems. Note
1543 that use-sockets feature was not tested on those systems. Client and
1544 server code no longer use MAX_PATH constant that is not defined on
1545 GNU/Hurd systems. [ISC-Bugs #25979]
1547 - Add a perl script in the contrib directory, dhcp-lease-list.pl, which
1548 can parse v4 lease files and output the lease information in a more
1549 human friendly manner. This was written by Christian Hammers with
1550 some updates by vom and ISC. This is contributed code and is not
1551 supported by ISC; however it may be useful to some users.
1554 - Add support in v6 for on-commit, on-expire and on-release.
1557 - Add support for using classes with v6.
1560 - Update the DDNS code to current standards and allow for sharing
1561 of DDNS entries between v4 and v6 clients. The new code is used
1562 if the ddns-update-style is set to "standard", the older code is
1563 still available if ddns-update-style is set to "interim". The
1564 oldest DDNS code "ad-hoc" has been removed. Thanks to Thomas Pegeot
1565 who submitted a patch for this issue. This patch is based on
1566 that work with some modifications.
1569 - Add a configuration option to the server to suppress using fsync().
1570 Enabling this option will mean that fsync() is never called. This
1571 may provide better performance but there is also a risk that a lease
1572 will not be properly written to the disk after it has been issued
1573 to a client and before the server stops. Using this option is
1577 - Add some logging statements to indicate when the server is ready
1578 to serve. One statement is emitted after the server has finished
1579 reading its files and is about to enter the dispatch loop.
1580 This is "Server starting service.".
1581 The second is emitted when a server determines that both it and
1582 its failover peer are in the normal state.
1583 This is "failover peer <name>: Both servers normal."
1586 - Add support for accessing options from v6 relays. The v6relay
1587 statement allows the administrator to choose which relay to
1588 use when searching for an option, see the dhcp-options man page
1589 for a description. The host-identifier option has also been
1590 updated to support the use of relay options, see the dhcpd.conf
1591 man page for a description.
1594 - When doing DDNS if there isn't an appropriate zone statement attempt
1595 to find a reasonable nameserver via a DNS resolver. This restores
1596 some functionality that was lost in the transition to asynchronous
1597 DDNS. Due to the lack of security and increase in fragility of the
1598 system when using this feature we strongly recommend the use of
1599 appropriate zone statements rather than using this functionality.
1602 - Add support for specifying the address from which to send
1603 DDNS updates on the DHCP server. There are two new options
1604 "ddns-local-address4" and "ddns-local-address6" that each take
1605 one instance of their respective address types.
1608 - Add ignore-client-uids option in the server. This option causes
1609 the server to not record a client's uid in its lease. This
1610 violates the specification but may also be useful when a client
1611 can dual boot using different client ids but the same mac address.
1612 Thank you to Brian De Wolf at Cal Poly Pomona for the patch.
1616 - Extend the DHCPINFORM processing to honor the subnet selection option
1617 and take host declarations into account.
1618 Thanks to Christof Chen for testing and submitting the patch.
1621 - Extend the hardware expression to look into the lease structure
1622 for a hardware address if there is no packet. This allows the
1623 server to find the hardware address during on-expiry processing.
1626 - Add definitions for some options that have been specified by the IETF.
1630 Changes since 4.2.0 (bug fixes)
1632 - When using 'ignore client-updates;', the FQDN returned to the client
1633 is no longer truncated to one octet.
1635 - Cleaned up an unused hardware address variable in nak_lease().
1637 - Manpage entries for the ia-pd and ia-prefix options were updated to
1638 reflect support for prefix delegation.
1640 - Cleaned up some compiler warnings
1642 - An optimization described in the failover protocol draft is now included,
1643 which permits a DHCP server operating in communications-interrupted state
1644 to 'rewind' a lease to the state most recently transmitted to its peer,
1645 greatly increasing a server's endurance in communications-interrupted.
1646 This is supported using a new 'rewind state' record on the dhcpd.leases
1647 entry for each lease.
1649 - Fix the trace code which was broken by the changes to the DDNS code.
1651 - Update the fsync code to work with the changes to the DDNS code. It now
1652 uses a timer instead of noticing if there are no more packets to process.
1654 - When constructing the DNS name structure from a text string append
1655 the root to relative names. This satisfies a requirement in the DNS
1656 library that names be absolute instead of relative and prevents DHCP
1657 from crashing. [ISC-Bugs #21054]
1659 - "The LDAP Patch" that has been circulating for some time, written by
1660 Brian Masney and S.Kalyanasundraram and maintained for application to
1661 the DHCP-4 sources by David Cantrell has been included. Please be
1662 advised that these sources were contributed, and do not yet meet the
1663 high standards we place on production sources we include by default.
1664 As a result, the LDAP features are only included by using a compile-time
1665 option which defaults off, and if you enable it you do so under your
1666 own recognizance. We will be improving this software over time.
1669 - Prohibit including lease time information in a response to a DHCP INFORM.
1672 ! Accept a client id of length 0 while hashing. Previously the server would
1673 exit if it attempted to hash a zero length client id, providing attackers
1674 with a simple denial of service attack. [ISC-Bugs #21253]
1675 CERT: VU#541921 - CVE: CVE-2010-2156
1677 - A memory leak in ddns processing was closed. [ISC-Bugs #21377]
1679 - Modify the exception handling for initial context creation. Previously
1680 we would try and clean up before exiting. This could present problems
1681 when the cleanup required part of the context that wasn't available. It
1682 also didn't do much as we exited afterwards anyway. Now we simply log
1683 the error and exit. [ISC-Bugs #21093]
1685 - A bug was fixed that could cause the DHCPv6 server to advertise/assign a
1686 previously allocated (active) lease to a client that has changed subnets,
1687 despite being on different shared networks. Dynamic prefixes specifically
1688 allocated in shared networks also now are not offered if the client has
1689 moved. [ISC-Bugs #21152]
1691 - Add some debugging output for use with the DDNS code. [ISC-Bugs #20916]
1693 - Fix the trace code to handle timing events better and to truncate a file
1694 before using instead of overwriting it. [ISC-Bugs #20969]
1696 - Modify the determination of the default TTL to use for DDNS updates.
1697 The user may still configure the ttl via ddns-ttl. The default for
1698 both v4 and v6 is now 1/2 the (preferred) lease time with a limit. The
1699 previous defaults (1/2 lease time without a limit for v4 and a default
1700 value for v6) may be used by defining USE_OLD_DDNS_TTL in site.h
1703 - libisc/libdns is now brought up to version 9.7.1rc1. This corrects
1704 three reported flaws in ISC DHCP;
1706 o DHCP processes (dhcpd, dhclient) fail to start if one of either the
1707 IPv4 or IPv6 address families is not present. [ISC-Bugs #21122]
1709 o Assertion failure when attempting to cancel a previously running DDNS
1710 update. [ISC-Bugs #21133]
1712 o Compilation failure of libisc/libdns due to the use of a flexible
1713 array member. [ISC-Bugs #21316]
1715 - Add declaration for variable in debug code in alloc.c. [ISC-Bugs #21472]
1717 - Documentation cleanup covering multiple tickets
1718 [ISC-Bugs #20265] [ISC-Bugs #20259] minor cleanup
1719 [ISC-Bugs #20263] add text describing some default values
1720 [ISC-Bugs #20193] single quotes at the start of a line indicate a control
1721 line to nroff, escape them if we actually want a quote.
1722 [ISC-Bugs #18916] sync the pointer to web pages amongst the different docs
1724 - 'get-host-names true;' now also works even if 'use-host-decl-names true;'
1725 was also configured. The nature of this repair also fixes another
1726 error; the host-name supplied by a client is no longer overridden by a
1727 reverse lookup of the lease address. Thanks to a patch from Wilco Baan
1728 Hofman supplied to us by the Debian package maintenance team.
1729 [ISC-Bugs #21691] {Debian Bug#509445}
1731 - The .TH tag for the dhcp-options manpage was typo repaired
1732 thanks to a report from jidanni and the Debian package maintenance
1733 team. [ISC-Bugs #21676] {Debian Bug#563613}
1735 - More documentation changes - primarily to put the options in the dhclient
1736 and dhcpd man pages into the standard form. Thanks in part to a patch
1737 from David Cantrell at Red Hat.
1738 [ISC-Bugs #20264] and parts of [ISC-Bugs #17744] dhclient.8 changes
1740 - Add code to clear the pointer to an object in an OMAPI handle when the
1741 object is freed due to a dereference. [ISC-Bugs #21306]
1743 - Fixed a bug that leaks host record references onto lease structures,
1744 causing the server to apply configuration intended for one host to any
1745 other innocent clients that come along later. [ISC-Bugs #22018]
1748 [ISC-Bugs #19566] When trying to find the zone for a name for ddns allow
1749 the name to be at the apex of the zone.
1750 [ISC-Bugs #19617] Restrict length of interface name read from command line
1751 in dhcpd - based on a patch from David Cantrell at Red Hat.
1752 [ISC-Bugs #20039] Correct some error messages in dhcpd.c
1753 [ISC-Bugs #20070] Better range check on values when creating a DHCID.
1754 [ISC-Bugs #20198] Avoid writing past the end of the field when adding
1755 overly long file or server names to a packet and add a log message
1756 if the configuration supplied overly long names for these fields.
1757 Thanks to Martin Pala.
1758 [ISC-Bugs #21497] Add a little more randomness to rng seed in client
1759 thanks to a patch from Jeremiah Jinno.
1761 - Correct error handling in DLPI [ISC-Bugs #20378]
1763 - Remove __sun__ and __hpux__ typedefs in osdep.h as they are now being
1764 checked in configure. [ISC-Bugs #20443]
1766 - Modify how the cmsg header is allocated the v6 send and received routines
1767 to compile on more compilers. [ISC-Bugs #20524]
1769 - When parsing a domain name free the memory for the name after we are
1770 done with it. [ISC-Bugs #20824]
1772 - Add an elapsed time option to the release message and refactor the
1773 code to move most of the common code to a single routine.
1776 - Two identical log messages for commit_leases() have been disambiguated.
1779 - Parse date strings more properly - the code now handles semi-colons in
1780 date strings correctly. Thanks to a patch from Jiri Popelka at Red Hat.
1781 [ISC-Bugs #21501, #20598]
1783 - Fixes to lease input and output.
1784 [ISC-Bugs #20418] - Some systems don't support the "%s" argument to
1785 strftime, paste together the same string using mktime instead.
1786 [ISC-Bugs #19596] - When parsing iaid values accept printable
1788 [ISC-Bugs #21585] - Always print time values in omshell as hex
1789 instead of ascii if the values happen to be printable characters.
1791 - Minor changes for scripts, configure.ac and Makefiles
1792 [ISC-Bugs #19147] Use domain-search instead of domain-name in manual and
1793 example conf file. Thanks to a patch from David Cantrell
1795 [ISC-Bugs #19761] Restore address when doing a rebind in DHCPv6
1796 [ISC-Bugs #19945] Properly close the quote on some arguments.
1797 [ISC-Bugs #20952] Add 64 bit types to configure.ac
1798 [ISC-Bugs #21308] Add "PATH=" to CLIENT_PATH environment variable
1800 - Update the code to parse dhcpv6 lease files to accept a semi-colon at
1801 the end of the max-life and preferred-life clauses. In order to be
1802 backwards compatible with older lease files not finding a semi-colon
1803 is also accepted. [ISC-Bugs #22303].
1805 ! Handle a relay forward message with an unspecified address in the
1806 link address field. Previously such a message would cause the
1807 server to crash. Thanks to a report from John Gibbins. [ISC-Bugs #21992]
1808 CERT: VU#102047 CVE: CVE-2010-3611
1810 - ./configure on longer searches for -lcrypto to explicitly link against.
1811 This fixes a bug where 'dhclient' would have shared library dependencies
1812 on '/usr/lib'. [ISC-Bugs #21967]
1814 - Handle pipe failures more gracefully. Some OSes pass a SIGPIPE
1815 signal to a process and will kill the process if the signal isn't
1816 caught. This patch adds code to turn off the SIGPIPE signal via
1817 a setsockopt() call. The signal is already being ignored as part
1818 of the ISC library. [ISC-Bugs #22269]
1820 - Restore printing of values in omshell to the style pre 21585. For
1821 21585 we changed the print routines to always display time values
1822 as a hex list. This had a side effect of printing all data strings
1823 as a hex list. We shall investigate other ways of displaying time
1824 values more usefully. [ISC-Bugs #22626]
1826 ! Fix the handling of connection requests on the failover port.
1827 Previously a connection request from a source that wasn't
1828 listed as a failover peer would cause the server to become
1829 non-responsive. Thanks to a report from Brad Bendily, brad@bendily.com.
1831 CERT: VU#159528 CVE: CVE-2010-3616
1833 - Don't pass the ISC_R_INPROGRESS status to the omapi signal handlers.
1834 Passing it through to the handlers caused the omshell program to fail
1835 to connect to the server. [ISC-Bugs #21839]
1837 - Fix the parenthesis in the code to process configuration statements
1838 beginning with "auth". The previous arrangement caused
1839 "auto-partner-down" to be processed incorrectly. [ISC-Bugs #21854]
1841 - Limit the timeout period allowed in the dispatch code to 2^^32-1 seconds.
1842 Thanks to a report from Jiri Popelka at Red Hat.
1843 [ISC-Bugs #22033], [Red Hat Bug #628258]
1845 - When processing the format flags for a given option consume the
1846 flag indicating an optional value correctly. A symptom of this
1847 bug was an infinite loop when trying to parse the slp-service-scope
1848 option. Thanks to a patch from Marius Tomaschewski.
1851 - Disable the use of kqueue in the ISC library. This avoids a problem
1852 between the fork and socket code that caused the dhcpd process to
1853 use all available cpu if the program daemonized itself.
1856 ! When processing a request in the DHCPv6 server code that specifies
1857 an address that is tagged as abandoned (meaning we received a
1858 decline request for it previously) don't attempt to move it from
1859 the inactive to active pool as doing so can result in the server
1860 crashing on an assert failure. Also retag the lease as active
1861 and reset its timeout value.
1864 - Removed the restriction on using IPv6 addresses in IPv4 mode. This
1865 allows IPv4 options which contain IPv6 addresses to be specified. For
1866 example the 6rd option can be specified and used like this:
1869 option 6rd code 212 = { integer 8, integer 8,
1870 ip6-address, array of ip-address };
1871 option 6rd 16 10 2001:: 1.2.3.4, 5.6.7.8;
1873 - Handle some DDNS corner cases better. Maintain the DDNS transaction
1874 information when updating a lease and cancel any existing transactions
1875 when removing the ddns information.
1878 - Some fixes for LDAP
1879 [ISC-Bugs #21783] - Include lber library when building ldap
1880 [ISC-Bugs #22888] - Enable the ldap code when buidling common
1881 The above fixes are from Jiri Popelka at Red Hat.
1883 - Modify the dlpi code to accept getmsg() returning a positive value.
1886 ! In dhclient check the data for some string options for
1887 reasonableness before passing it along to the script that
1888 interfaces with the OS.
1892 - DHCPv6 server now responds properly if client asks for a prefix that
1893 is already assigned to a different client. [ISC-Bugs #23948]
1895 - Add the option "--no-pid" to the client, relay and server code,
1896 to disable writing a pid file. Add the option "-pf pidfile"
1897 to the relay to allow the user to supply the pidfile name at
1898 runtime. Add the "with-relay6-pid-file" option to configure
1899 to allow the user to supply the pidfile name for the relay
1900 in v6 mode at configure time.
1901 [ISC-Bugs #23351] [ISC-Bugs #17541]
1903 - 'dhclient' no longer waits a random interval after first starting up to
1904 begin in the INIT state. This conforms to RFC 2131, but elects not to
1905 implement a 'SHOULD' direction in section 4.1. The goal of this change
1906 is to start up faster. [ISC-Bugs #19660]
1908 - Added 'initial-delay' parameter that specifies maximum amount of time
1909 before client goes to the INIT state. The default value is 0. In previous
1910 versions of the code client could wait up to 5 seconds. The old behavior
1911 may be restored by using 'initial-delay 5;' in the client config file.
1914 - ICMP ping-check should now sit closer to precisely the number of seconds
1915 configured (or default 1), due to making use of the new microsecond
1916 scale timer internally to dhcpd. This corrects a bug where the server
1917 may immediately timeout an ICMP ping-check if it was made late in the
1918 current second. [ISC-Bugs #19660]
1920 - The DHCP client will schedule renewal and rebinding events in
1921 microseconds if the DHCP server provided a lease-time that would result
1922 in sub-1-second timers. This corrects a bug where a 2-second or lower
1923 lease-time would cause the DHCP client to enter an infinite loop by
1924 scheduling renewal at zero seconds. [ISC-Bugs #19660]
1926 - Client lease records are recorded at most once every 15 seconds. This
1927 keeps the client from filling the lease database disk quickly on very small
1928 lease times. [ISC-Bugs #19660]
1930 - To defend against RFC 2131 non-compliant DHCP servers which fail to
1931 advertise a lease-time (either mangled, or zero in value) the DHCP
1932 client now adds the server to the reject list ACL and returns to INIT
1933 state to hopefully find an RFC 2131 compliant server (or retry in INIT
1934 forever). [ISC-Bugs #19660]
1936 - Parameters configured to evaluate from user defined function calls can
1937 now be correctly written to dhcpd.leases (as on 'on events' or dynamic
1938 host records inserted via OMAPI). [ISC-Bugs #22266]
1940 - If a 'next-server' parameter is configured in a dynamic host record via
1941 OMAPI as a domain name, the syntax written to disk is now correctly parsed
1942 upon restart. [ISC-Bugs #22266]
1944 - The DHCP server now responds to DHCPLEASEQUERY messages from agents using
1945 IP addresses not covered by a subnet in configuration. Whether or not to
1946 respond to such an agent is still governed by the 'allow leasequery;'
1947 configuration parameter, in the case of an agent not covered by a configured
1948 subnet the root configuration area is examined. Server now also returns
1949 vendor-class-id option, if client sent it. [ISC-Bugs #21094]
1951 - Documentation fixes
1952 [ISC-Bugs #17959] add text to AIX section describing how to have it send
1953 responses to the all-ones address.
1954 [ISC-Bugs #19615] update the includes in dhcpctl/dhcpctl.3 to be more correct
1955 [ISC-Bugs #20676] update dhcpd.conf.5 to include the RFC numbers for DDNS
1957 - Relay no longer crashes, when DHCP packet is received over interface without
1958 any IPv4 address assigned. Also extended logging message about discarding
1959 packets with invalid hlen with information about relevant interface name.
1962 - Relay now properly logs that packet was received over interface without
1963 global IPv6 address [ISC-Bugs #24070]
1965 - Linux Packet Filter interface improvement. sockaddr_pkt structure is used,
1966 rather than sockaddr. Packet ethertype is now forced to ETH_P_IP.
1969 - Minor code cleanups - but note port change for #23196
1970 [ISC-Bugs #23470] - Modify when an ignore return macro is defined to
1971 handle unsed error return warnings for more versions of gcc.
1972 [ISC-Bugs #23196] - Modify the reply handling in the server code to
1973 send to a specified port rather than to the source port for the incoming
1974 message. Sending to the source port was test code that should have
1975 been removed. The previous functionality may be restored by defining
1976 REPLY_TO_SOURCE_PORT in the includes/site.h file. We suggest you don't
1977 enable this except for testing purposes.
1978 [ISC-Bugs #22695] - Close a file descriptor in an error path.
1979 [ISC-Bugs #19368] - Tidy up variable types in validate_port.
1981 - Code cleanup: remove obsolete PROTO, KandR, INLINE and ANSI_DECL macros
1984 - Compilation problem with gcc4.5 and omshell.c resolved. [ISC-Bugs #23831]
1986 - Client Script fixes
1987 [ISC-Bugs #23045] Typos in client/scripts/openbsd
1988 [ISC-Bugs #23565] In the client scripts add a zone id (interface id) if
1989 the domain search address is link local.
1990 [ISC-Bugs #1277] In some of the client scripts add code to handle the
1991 case of the default router information being changed without the address
1994 - Documentation cleanup
1995 [ISC-Bugs #23326] Updated References document, several man page updates
1997 - Server no longer complains about NULL pointer when configured
1998 server-identifier expression fails to evaluate. [ISC-Bugs #24547]
2000 - Convert ISC_R_INPROGRESS status to ISC_R_SUCCESS when called from other
2001 than the dispatch handler. This fixes an issue where omshell, when
2002 run from the same platform as the server, would appear to fail to
2003 connect. This is a companion to #21839. [ISC-Bugs #23592]
2005 - Enlarge the buffer size used by the Omshell code and some of the
2006 print routines to allow for greater than 60 characters or, when
2007 printing as hex strings, 20 characters. [ISC-Bugs #22743]
2009 - In Solaris 11 switch to using sockets instead of DLPI, thanks
2010 to a patch form Oracle. [ISC-Bugs #24634].
2012 - Strict checks for content of domain-name DHCPv4 option can now be
2013 configured during compilation time. Even though RFC2132 does not allow
2014 to store more than one domain in domain-name option, such behavior is
2015 now enabled by default, but this may change some time in the future.
2016 See ACCEPT_LIST_IN_DOMAIN_NAME define in includes/site.h.
2019 - DNS Update fix. A misconfigured server could crash during DNS update
2020 processing if the configuration included overlapping pools or
2021 multiple fixed-address entries for a single address. This issue
2022 affected both IPv4 and IPv6. The fix allows a server to detect such
2023 conditions, provides the user with extra information and recommended
2024 steps to fix the problem. If the user enables the appropriate option
2025 in site.h then server will be terminated
2028 ! Two packets were found that cause a server to halt. The code
2029 has been updated to properly process or reject the packets as
2030 appropriate. Thanks to David Zych at University of Illinois
2031 for reporting this issue. [ISC-Bugs #24960]
2032 One CVE number for each class of packet.
2036 - Fix the code that checks for an existing DDNS transaction to cancel
2037 when removing DDNS information, so that we will continue with the
2038 processing if we have a lease even if it doesn't have an outstanding
2039 transaction. [ISC-Bugs #24682]
2041 - Add AM_MAINTAINER_MODE to configure.ac to avoid rebuilding
2042 configuration files. [ISC-Bugs #24107]
2044 - Add support for passing DDNS information to a DNS server over
2045 an IPv6 address. [ISC-Bugs #22647]
2047 - Enhanced patch for 23595 to handle IPv4 fixed addresses more
2048 cleanly. [ISC-Bugs #23595]
2050 ! Add a check for a null pointer before calling the regexec function.
2051 Without this check we could, under some circumstances, pass
2052 a null pointer to the regexec function causing it to segfault.
2053 Thanks to a report from BlueCat Networks.
2057 ! Modify the DDNS handling code. In a previous patch we added logging
2058 code to the DDNS handling. This code included a bug that caused it
2059 to attempt to dereference a NULL pointer and eventually segfault.
2060 While reviewing the code as we addressed this problem, we determined
2061 that some of the updates to the lease structures would not work as
2062 planned since the structures being updated were in the process of
2063 being freed: these updates were removed. In addition we removed an
2064 incorrect call to the DDNS removal function that could cause a failure
2065 during the removal of DDNS information from the DNS server.
2066 Thanks to Jasper Jongmans for reporting this issue.
2070 - Fixed the code that checks if an address the server is planning
2071 to hand out is in a reserved range. This would appear as
2072 the server being out of addresses in pools with particular ranges.
2075 - In the DDNS code handle error conditions more gracefully and add more
2076 logging code. The major change is to handle unexpected cancel events
2077 from the DNS client code.
2080 - Tidy up the receive calls and eliminate the need for found_pkt.
2083 - Add support for Infiniband over sockets to the server and
2084 relay code. We've tested this on Solaris and hope to expand
2085 support for Infiniband in the future. This patch also corrects
2086 some issues we found in the socket code.
2089 - Add a compile time check for the presence of the noreturn attribute
2090 and use it for log_fatal if it's available. This will help code
2091 checking programs to eliminate false positives.
2094 - Fixed many compilation problems ("set, but not used" warnings) for
2095 gcc 4.6 that may affect Ubuntu 11.10 users. [ISC-Bugs #27588]
2097 - Modify the code that determines if an outstanding DDNS request
2098 should be cancelled. This patch results in cancelling the
2099 outstanding request less often. It fixes the problem caused
2100 by a client doing a release where the TXT and PTR records
2101 weren't removed from the DNS.
2104 - Use offsetof() instead of sizeof() to get the sizes for dhcpv6_relay_packet
2105 and dhcpv6_packet in several more places. Thanks to a report from
2106 Bruno Verstuyft and Vincent Demaertelaere of Excentis.
2109 - Remove outdated note in the description of the bootp keyword about the
2110 option not satisfying the requirement of failover peers for denying
2111 dynamic bootp clients.
2114 - Multiple items to clean up IPv6 address processing.
2115 When processing an IA that we've seen check to see if the
2116 addresses are usable (not in use by somebody else) before
2118 When reading in leases from the file discard expired addresses.
2119 When picking an address for a client include the IA ID in
2120 addition to the client ID to generally pick different addresses
2122 [ISC-Bugs #23138] [ISC-Bugs #27945] [ISC-Bugs #25586]
2125 - Remove unnecessary checks in the lease query code and clean up
2126 several compiler issues (some dereferences of NULL and treating
2127 an int as a boolean).
2130 - Fix the NA and PD allocation code to handle the case where a client
2131 provides a preference and the server doesn't have any addresses or
2132 prefixes available. Previously the server ignored the request with
2133 this patch it replies with a NoAddrsAvail or NoPrefixAvail response.
2134 By default the code performs according to the errata of August 2010
2135 for RFC 3315 section 17.2.2; to enable the previous style see the
2136 section on RFC3315_PRE_ERRATA_2010_08 in includes/site.h. This option
2137 may be removed in the future.
2138 Thanks to Jiri Popelka at Red Hat for the patch.
2141 - Fix up some issues found by static analysis.
2142 A potential memory leak and NULL dereference in omapi.
2143 The use of a boolean test instead of a bitwise test in dst.
2146 - Rotate the lease file when running in v6 mode.
2147 Thanks to Christoph Moench-Tegeder at Astaro for the
2148 report and the first version of the patch.
2151 - Correct code to calculate timing values in client to compare
2152 rebind value to infinity instead of renew value.
2153 Thanks to Chenda Huang from H3C Technologies Co., Limited
2154 for reporting this issue.
2157 - Fix some issues in the code for parsing and printing options.
2158 [ISC-Bugs #22625] - properly print options that have several fields
2159 followed by an array of something for example "fIa"
2160 [ISC-Bugs #27289] - properly parse options in declarations that have
2161 several fields followed by an array of something for example "fIa"
2162 [ISC-Bugs #27296] - properly determine if we parsed a 16 or 32 bit
2163 value in evaluate_numeric_expression (extract-int).
2164 [ISC-Bugs #27314] - properly parse a zero length option from
2165 a lease file. Thanks to Marius Tomaschewski from SUSE for the report
2166 and prototype patch for this ticket as well as ticket 27289.
2168 ! Previously the server code was relaxed to allow packets with zero
2169 length client ids to be processed. Under some situations use of
2170 zero length client ids can cause the server to go into an infinite
2171 loop. As such ids are not valid according to RFC 2132 section 9.14
2172 the server no longer accepts them. Client ids with a length of 1
2173 are also invalid but the server still accepts them in order to
2174 minimize disruption. The restriction will likely be tightened in
2175 the future to disallow ids with a length of 1.
2176 Thanks to Markus Hietava of Codenomicon CROSS project for the
2177 finding this issue and CERT-FI for vulnerability coordination.
2181 ! When attempting to convert a DUID from a client id option
2182 into a hardware address handle unexpected client ids properly.
2183 Thanks to Markus Hietava of Codenomicon CROSS project for the
2184 finding this issue and CERT-FI for vulnerability coordination.
2188 ! A pair of memory leaks were found and fixed. Thanks to
2189 Glen Eustace of Massey University, New Zealand for finding
2194 - Existing legacy unit-tests have been migrated to Automated Test
2195 Framework (ATF). Several new tests have been developed. To enable
2196 unit-tests, please use --with-atf in configure script. A Developer's
2197 Guide has been added. To generate it, please use make devel in
2198 the doc directory. It is currently in early stages of development,
2199 but is expected to grow in the near future. [ISC-Bugs 25901]
2201 ! An issue with the use of lease times was found and fixed. Making
2202 certain changes to the end time of an IPv6 lease could cause the
2203 server to abort. Thanks to Glen Eustace of Massey University,
2204 New Zealand for finding this issue.
2208 - Update the memory leakage debug code to work with v6.
2211 - Relax the requirements for deleting an A or AAAA record.
2212 Previously the DDNS removal code required both the A or AAAA
2213 record and the TXT record to exist. This requirement could
2214 cause problems if something interrupted the removal leaving
2215 the TXT record alone. This relaxation was codified in RFC 4703.
2218 - Modify the failover code to handle incorrect peer names
2219 better. Previously the structure holding the name might
2220 have been freed inappropriately in some cases and not
2221 freed in other cases.
2224 - Add a configure option, enable-secs-byteorder, to deal with
2225 clients that do the byte ordering on the secs field incorrectly.
2226 This field should be in network byte order but some clients
2227 get it wrong. When this option is enabled the server will examine
2228 the secs field and if it looks wrong (high byte non zero and low
2229 byte zero) swap the bytes. The default is disabled. This option
2230 is only useful when doing load balancing within failover.
2233 - Fix a set of issues that were discovered via a code inspection
2234 tool. Thanks to Jiri Popelka and Tomas Hozza Red Hat for the logs
2238 - Parsing unquoted base64 strings improved. Parser now properly handles
2239 strings that contain reserved names. [ISC-Bugs #23048]
2241 - Modify the nak_lease function to make some attempts to find a
2242 server-identifier option to use for the NAK.
2245 - The client now passes information about the options it requested
2246 from the server to the script code via environment variables.
2247 These variables are of the form requested_<option_name>=1 with
2248 the option name being the same as used in the new_* and old_*
2252 - Add support for a simple check that the server id in a request message
2253 to a failover peer matches the server id of the server. This support
2254 is enabled by editing the file includes/site.h and uncommenting the
2255 definition for SERVER_ID_CHECK. The option has several restrictions
2256 and issues - please read the comment in the site.h file before
2260 - Tidy up some compiler issues in the debug code.
2263 - Move the dhcpd.conf example file to dhcpd.conf.example to avoid
2264 overwriting the dhcpd.conf file when installing a new version of
2265 ISC DHCP. The user will now need to manual copy and edit the
2266 dhcpd.conf file as desired.
2269 - Check the status value when trying to read from a connection to
2270 see if it may have been closed. If it appears closed don't try
2271 to read from it again. This avoids a potential busy-wait like
2272 loop when the peer names are mismatched.
2275 - Remove an unused variable to keep compilers happy.
2278 - Modify test makefiles to be more similar to standard makefiles
2279 and comment out a currently unused test.
2282 - Address static analysis warnings.
2283 [ISC-Bugs #33510] [ISC-Bugs #33511]
2285 - Silence benign static analysis warnings.
2288 - Add check for 64-bit package for atf.
2291 - Use newer auto* tool packages and turn on RFC_3542 support on Mac OS.
2294 - Remove a variable when it isn't being used due to #ifdefs to avoid
2295 a compiler warning on Solaris using GCC.
2298 - Add a check for too much whitespace in a config or lease file.
2299 Thanks to Paolo Pellegrino for finding the issue and a suggestion
2303 - Fix several problems with using OMAPI to manipulate class and subclass
2307 - Added a sleep call after killing the old client to allow time
2308 for the sockets to be cleaned. This should allow the -r option
2309 to work more consistently.
2312 - Missing files for ISC DHCP Developer's Guide are now included in
2313 the release tarballs. To generate this documentation, please use
2314 make devel command in doc directory. [ISC-Bugs #32767]
2316 - Update client script for use with openwrt.
2319 - Fix the socket handling for DHCPv6 clients to allow multiple instances
2320 of a client on a single machine to work properly. Previously only
2321 one client would receive the packets. Thanks to Jiri Popelka at Red Hat
2322 for the bug report and a potential patch.
2325 - Added support for gentle shutdown after signal is received.
2326 [ISC-Bugs #32692] [ISC-Bugs 34945]
2328 - Enhance the DHCPv6 server logging to include the addresses that are assigned
2332 - Fix an operation in the DDNS code to be a bitwise instead of logical or.
2336 Changes since 4.1.0 (new features)
2338 - Failover port configuration can now be left to defaults (port 647) as
2339 described in the -12 revision of the Failover draft (and assigned by
2340 IANA). Thanks in part to a patch from David Cantrell at Red Hat.
2342 - If configured, dhclient may now transmit to an anycast MAC address,
2343 rather than using a broadcast address. Thanks to a patch from David
2344 Cantrell at Red Hat.
2346 - Added client support for setting interface MTU and metric, thanks to
2347 Roy "UberLord" Marples <roy@marples.name>.
2349 - Added client -D option to specify DUID type to send.
2351 - A new failover configuration parameter has been introduced for those
2352 environments where DHCP servers can be reasonably guaranteed to be
2353 "down" when the failover TCP socket is severed, "auto-partner-down".
2354 This parameter is not generally safe, and by default is disabled, so
2355 please carefully review the documentation of this parameter in the
2356 dhcpd.conf(5) manpage before determining to use it yourself.
2358 - Added a configuration function, 'gethostname()', which calls the system
2359 function of the same name and presents the results as a data expression.
2360 This function can be used to incorporate the system level hostname of
2361 the system the DHCP software is operating on in responses or queries (such
2362 as including a failover partner's hostname in a dhcp message or binding
2363 scope, or having a DHCP client send any system hostname in the host-name or
2364 FQDN options by default).
2366 - The dhcp-renewal-time and dhcp-rebinding-time options may now be configured
2367 for DHCPv4 operation and used independently of the dhcp-lease-time
2368 calculations. Invalid renew and rebinding times (e.g., greater than the
2369 determined lease time) are omitted.
2371 - Processing the DHCP to DNS server transactions in an asynchronous fashion,
2372 the DHCP server or client can now continue with its processing while
2373 awaiting replies from the DNS server.
2375 - The 'hardware [ethernet|etc] ...;' parameter in host records has been
2376 extended to attempt to match DHCPv6 clients by the last octets of a
2377 DUID-LL or DUID-LLT provided by the client.
2379 Changes since 4.1.0 (bug fixes)
2381 - Remove infinite loop in token_print_indent_concat().
2383 - Validate the argument to the -p option.
2385 - The notorious 'option <unknown> ... larger than buffer' log line,
2386 which is seen in some malformed DHCP client packets, was modified.
2387 It now logs the universe name, and does not log the length values
2388 (which are bogus corruption read from the packet anyway). It also
2389 carries a hopefully more useful explanation.
2391 - Suppress spurious warnings from configure about --datarootdir
2393 - A bug was fixed that caused the server not to answer some valid Solicit
2394 and Request packets, if the dynamic range covering any requested addresses
2395 had been deleted from configuration.
2397 - Update the code to deal with GCC 4.3. This included two sets of changes.
2398 The first is to the configuration files to include the use of
2399 AC_USE_SYSTEM_EXTENSIONS. The second is to deal with return values that
2402 - The db-time-format option was documented in manpages.
2404 - Using reserved leases no longer results in 'lease with binding state
2405 free not on its queue' error messages, thanks to a patch from Frode
2408 - Fix a build error in dhcrelay, using older versions of gcc with
2411 - Two uninitialized stack structures are now memset to zero, thanks to a
2412 patch from David Cantrell at Red Hat.
2414 - Fixed a cosmetic bug where pretty-printing valid domain-search options would
2415 result in an erroneous error log message ('garbage in format string').
2417 - A bug in DLPI packet transmission (Solaris, HP/UX) that caused the server
2418 to stop receiving packets is fixed. The same fix also means that the MAC
2419 address will no longer appear 'bogus' on DLPI-based systems.
2421 - A bug in select handling was discovered where the results of one select()
2422 call were discarded, causing the server to process the next select() call
2423 and use more system calls than required. This has been repaired - the
2424 sockets will be handled after the first return from select(), resulting in
2427 - The update-conflict-detection feature would leave an FQDN updated without
2428 a DHCID (still currently implemented as a TXT RR). This would cause later
2429 expiration or release events to fail to remove the domain name. The feature
2430 now also inserts the client's up to date DHCID record, so records may safely
2431 be removed at expiration or release time. Thanks to a patch submitted by
2434 - Memory leak in the load_balance_mine() function is fixed. This would
2435 leak ~20-30 octets per DHCPDISCOVER packet while failover was in use
2436 and in normal state.
2438 - Various compilation fixes have been included for the memory related
2439 DEBUG #defines in includes/site.h.
2441 - Fixed Linux client script 'unary operator expected' errors with DHCPv6.
2443 - Fixed setting hostname in Linux hosts that require hostname argument
2444 to be double-quoted. Also allow server-provided hostname to
2445 override hostnames 'localhost' and '(none)'.
2447 - Fixed failover reconnection retry code to continue to retry to reconnect
2448 rather than restarting the listener.
2450 - Compilation on Solaris with USE_SOCKETS defined in includes/site.h has
2451 been repaired. Other USE_ overrides should work better.
2453 - A check for the local flavor of IFNAMSIZ had a broken 'else' condition,
2454 that probably still resulted in the correct behaviour (but wouldn't use
2455 a larger defined value provided by the host OS).
2457 - Fixed a bug where an OMAPI socket disconnection message would not result
2458 in scheduling a failover reconnection, if the link had not negotiated a
2459 failover connect yet (e.g.: connection refused, asynch socket connect()
2462 - A bug was fixed that caused the 'conflict-done' state to fail to be parsed
2463 in failover state records.
2465 ! A stack overflow vulnerability was fixed in dhclient that could allow
2466 remote attackers to execute arbitrary commands as root on the system,
2467 or simply terminate the client, by providing an over-long subnet-mask
2468 option. CERT VU#410676 - CVE-2009-0692
2470 - Fixed a bug where relay agent options would never be returned when
2471 processing a DHCPINFORM.
2473 - Versions 3.0.x syntax with multiple name->code option definitions is now
2474 supported. Note that, similarly to 3.0.x, for by-code lookups only the
2475 last option definition is used.
2477 - Fixed a bug where a time difference of greater than 60 seconds between a
2478 failover pair could cause the primary to crash on contact with the
2479 secondary. Thanks to a patch from Steinar Haug.
2481 - Don't look for IPv6 interfaces on Linux when running in DHCPv4 mode.
2482 Thanks to patches from Matthew Newton and David Cantrell.
2484 - Secondary servers in a failover pair will now perform ddns removals if
2485 they had performed ddns updates on a lease that is expiring, or was
2486 released through the primary. As part of the same fix, stale binding scopes
2487 will now be removed if a change in identity of a lease's active client is
2488 detected, rather than simply if a lease is noticed to have expired (which it
2489 may have expired without a failover server noticing in some situations).
2491 - A patch supplied by David Cantrell at RedHat was applied that detects
2492 invalid calling parameters given to the ns_name_ntop() function.
2493 Specifically, it detects if the caller passed a pointer and size pair
2494 that causes the pointer to integer-wrap past zero.
2496 ! Fixed a fenceposting bug when a client had two host records configured,
2497 one using 'uid' and the other using 'hardware ethernet'. CVE-2009-1892
2499 - Fixed the check in the dhcp_interface_signal_handler routine to verify
2500 the existence of the linked signal handler before calling it.
2502 - Both host and subnet6 configuration groups are now included whether a
2503 fixed-address6 (DHCPv6) is in use or not. Host scoped configuration takes
2504 precedence. This fixes two bugs, one where host scoped configuration
2505 would not be included from a non-fixed-address6 host record, and the equal
2506 and opposite bug where subnet6 scoped configuration would not be used when
2507 over-riding values were not present in a matching fixed-address6 host
2510 - ./configure now checks to ensure the intX_t and u_intX_t types are defined,
2511 correcting a compilation failure when using Sun's compiler.
2513 - Modified the handling of a connection to avoid releasing the omapi io
2514 object for the connection while it is still in use. One symptom from
2515 this error was a segfault when a failover secondary attempted to connect
2516 to the failover primary if their clocks were not synchronized.
2518 - Clean up to allow compilation with gcc 2.95.4 on FreeBSD. Remove an
2519 extra semi-colon from common/dns.c and moved setting a variable to NULL
2520 in server/dhcpv6.c to allow the compiler to decide that the variable
2521 was always properly set.
2523 Changes since 4.1.0b1
2525 - A missing "else" in dhcrelay.c could have caused an interface not to
2528 Changes since 4.1.0a2
2530 - A cosmetic bug in DHCPDECLINE processing was fixed which caused all
2531 successful DHCPDECLINEs to be logged as "not found" rather than
2534 - Added configuration file examples for DHCPv6.
2536 - Some failover debugging #defines have been better defined and some
2537 high frequency messages moved to a deeper debugging symbol.
2539 - The CLTT parameter in failover is now only updated by client activity,
2540 and not by failover binding updates (taking on the peer's CLTT).
2542 - Failover BNDUPD messages are now discarded if they conflict with an
2543 update that has been transmitted, but not acknowledged.
2545 - A bug cleaning up unknown-xxx temporary option definitions was fixed.
2547 - Delayed-ack is now a compile-time option, compiled out by default.
2548 This feature is simply too experimental for right now, and causes
2549 some problems to some failover installations. We will revisit this
2552 - The !inet_pton() call in res_mkupdrec was adjusted to '<= 0' as
2553 inet_pton returns either 1, 0, or -1.
2555 - A dhclient-script for MacOS X has been included, which enables
2556 'dhclient -6' support.
2558 - DDNS removal routines were updated so that the DHCID is not removed until
2559 the client has been deprived of all A and AAAA records (not only the last
2560 one of either of those). This resolves a bug where dual stack clients
2561 would not be able to regain their names after either expiration event.
2563 Changes since 4.1.0a1
2565 - Corrected list of failover state values in dhcpd man page.
2567 - Fixed a bug that caused some request types to be logged incorrectly.
2569 - Clients that sent a parameter request list containing the
2570 routers option before the subnet mask option were receiving
2571 only the latter. Fixed.
2573 - The server wasn't always sending the FQDN option when it should.
2575 - A partner-down failover server no longer emits 'peer holds all free leases'
2576 if it is able to newly-allocate one of the peer's leases.
2578 - Fixed a coredump when adding a class via OMAPI.
2580 - Check whether files are zero length before trying to parse them.
2582 - Ari Edelkind's PARANOIA patch has been included and may be compiled in
2583 via two ./configure parameters, --enable-paranoia and
2584 --enable-early-chroot.
2586 - ./configure was extended to cover many optional build features, such
2587 as failover, server tracing, debugging, and the execute() command.
2589 - There is now a default 1/4 of a second scheduled delay between delayed
2590 fsync()'s, it can be configured by the max-ack-delay configuration
2593 - A bug was fixed where the length of a hostname was miscalculated, so that
2594 hosts were given odd-looking domain names ("foo.bar.ba.example.com").
2596 - Shared network selection should be done from the innermost relay
2597 valid link-address field, rather than the outermost.
2599 - Prefix pools are attached to shared network scopes.
2601 - Merged IA_XX related structures.
2603 - Add DHCPv6 files in configure.
2605 - A memory leak when using omapi has been fixed.
2607 - DHCPv6 vendor-class options (VSIO) are now only sent when they appear
2608 on the DHCPv6 ORO. This resolves a bug where VSIO options were placed
2609 in IA_NA encapsulated options fields.
2611 - Integrated client with stateless, temporary address and prefix delegation
2614 - A double-dereference in dhclient transmission of DHCPDECLINEs was
2617 - Fix handling of format code 'Z'.
2619 - Support "-1" argument in DHCPv6.
2621 - Merge DHCPv6-only "dhcrelay6" into general-purpose "dhcrelay" (use
2622 "-6" option to select DHCPv6 mode).
2624 - Fix handling of -A and -a flags in dhcrelay; it was failing to expand
2625 packet size as needed to add relay agent options.
2627 - A bug in subnet6 parsing where options contained in subnet6 clauses would
2628 not be applied to clients addressed within that network was repaired.
2630 - When configuring a "subnet {}" or "subnet6 {}" without an explicit
2631 shared-network enclosing it, the DHCP software would synthesize a
2632 shared-network to contain the subnet. However, all configuration
2633 parameters within the subnet more intuitively belong "to any client
2634 on that interface", or rather the synthesized shared-network. So,
2635 when a shared-network is synthesized, it is used to contain the
2636 configuration present inside the subnet {} clause. This means that
2637 the configuration will be valid for all clients on that network, not
2638 just those addressed out of the stated subnet. If you intended the
2639 opposite, the workaround is to explicitly configure an empty
2642 - A bug was fixed where Information-Request processing was not sourcing
2643 configured option values.
2645 - A warning was added since the DHCPv6 processing software does not yet
2646 support class statements.
2648 - Compilation warnings on GCC 4.3 relating to bootp source address
2649 selection were repaired.
2651 - The v6 BSD socket method was updated to use a single UDP BSD socket
2652 no matter how many interfaces are involved, differentiating the
2653 interfaces the packets were received on by the interface index supplied
2656 - The relay agent no longer listens to the All DHCP Servers Multicast
2659 - A bug was fixed in data_string_sprintfa() where va_start was only called
2660 once for two invocations of vsprintf() variants.
2662 - ERO (RFC 4994) server support.
2664 - Basic and partial DHCPv6 leasequery support.
2666 - Reliable DHCPv6 release (previous behavior, send release and exit, is
2667 still available with dhclient -6 -1 -r).
2669 Changes since 4.0.0 (new features)
2671 - Added DHCPv6 rapid commit support.
2673 - Added explicit parser support for zero-length DHCP options, such as
2674 rapid-commit, via format code 'Z'.
2676 - It's now possible to update the "ends" field of a lease with OMAPI.
2677 This is useful if you want not only to release a lease, but also make
2678 it available for reuse right away. Hat tip to Christof Chen.
2680 - Fixed definition of the iaaddr hash functions to use the correct
2681 functions when referencing and dereferencing memory.
2683 - Some definitions not in phase with the IANA registry were updated.
2685 - Allocated interface IDs are better controlled ('u' bit set to zero,
2686 reserved IDs avoided).
2688 - Unicast options are taken into account only for RENEWs.
2690 - NoAddrsAvail answers to SOLICITs are always ADVERTISEs even when a SOLICIT
2691 carries a rapid-commit option.
2693 - Return in place of raise an impossible condition when one tries to release
2694 an empty active lease.
2696 - Timer granularity is now 1/100s in the DHCPv6 client.
2698 - The dhclient-script was updated to create a host route for the default
2699 gateway if the supplied subnet mask for an IPv4 address was a /32. This
2700 allows the client to work in 'captive' network environments, where the
2701 operator does not want clients to crosstalk directly.
2703 - MINUS tokens should be parsable again.
2705 - Multiple (up to "delayed-ack x;" maximum) DHCPv4 packets are now queued and
2706 released in bursts after single fsync() events when the upper limit is
2707 reached or if the receiving sockets go dry. The practical upshot is
2708 that fsync-coupled server performance is now multiplicitively increased.
2709 The default delayed ack limit is 28. Thanks entirely to a patch from
2712 Changes since 4.0.0 (bug fixes)
2714 - DHCP now builds on AIX.
2716 - Exit with warning when DHCPv6-specific statements are used in the
2717 config file but -6 is not specified.
2719 - Fixed "--version" flag in dhcrelay
2721 - The 'min-secs' configuration parameter's log message has been updated to
2724 - The warning logged when an address range doesn't fit in the subnets
2725 they were declared has been updated to be more helpful and identify the
2726 typo in configuration that created the spanning addresses.
2728 - A bug in failover pool rebalancing that caused POOLREQ message ping-pongs
2731 - A flaw in failover pool rebalancing that could cause POOLREQ messages to
2732 be sent outside of the min-balance/max-balance scheduled intervals has
2735 - A cosmetic bug during potential-conflict recovery that caused the peer's
2736 'conflict-done' state message to be logged as 'unknown-state' has been
2737 repaired. It is now logged correctly.
2739 - A bug was fixed where the 'giaddr' may be used to find the client's subnet
2740 rather than its own 'ciaddr'.
2742 - A log message was introduced to clarify the situation where a failover
2743 'address' parameter (the server's local address) did not resolve to an
2746 - The minimum site code value was set to 224 in 3.1.0 to track RFC3942. This
2747 broke a lot of legacy site local configurations. The new code in place will
2748 track site local space minimum option codes and logs a warning to encourage
2749 updates and exploration of site local code migration problems. Option
2750 codes less than 128 in site local spaces remain inaccessible.
2752 - A possible relay agent option bug was repaired where random server
2753 initialization state may have been used to signal the relay agent
2754 information options sub-option code for the 'END' of the option space.
2756 - Fixes to allow code to compile and run on Solaris 9.
2758 - Fixes to allow code to compile on Mac OS X Leopard (10.5).
2760 - When server is configured with options that it overrides, a warning is
2761 issued when the configuration file is read, rather than at the time the
2762 option is overridden. This was important, because the warning was given
2763 every time the option was overridden, which could create a lot of
2764 unnecessary logging.
2766 - Fixed a compilation problems on platforms that define a value for FDDI,
2767 which conflicts with a dhcp configuration syntax token by the same name.
2769 - When a failover server suspects it has encountered a peer running a
2770 version 3.0.x failover server, a warning that the failover wire protocol
2771 is incompatible is printed.
2773 - The failover server no longer issues a floating point error if it encounters
2774 a previously undefined option code.
2776 - Fix startup error messages to report a missing "subnet6 declaration", rather
2777 than a missing "subnet declaration", when running as a DHCPv6 server.
2779 - DHCPv6 client timestamp in DUID was based on the year 1970 rather
2782 - Warn when attempting to use a hardware parameter in DHCPv6.
2784 - DHCPv6 released resources are now marked as released by the client.
2786 - 'Soft' bindings have no more side-effects.
2788 Changes since 4.0.0b3
2790 - The reverse dns name for PTR updates on IPv6 addresses has been fixed to
2791 use ip6.arpa. rather than default to in-addr.arpa and require user
2794 - dhc6_lease_destroy() and dhc6_ia_destroy() now set lease and IA pointers
2795 to NULL after freeing, to prevent subsequent accesses to freed memory.
2797 - The DHCPv6 server would not send the preference option unless the
2798 client requested it, via the ORO. This has been fixed, so the DHCPv6
2799 server will always send the preference value if it is configured.
2801 - When addresses were passed as hints to the server in an IA, they were
2802 incorrectly handled, sometimes being treated as an error. Now the
2803 server will treat these as hints and ignore them if it cannot supply
2804 a requested address.
2806 - If the client had multiple addresses, and one expired (was not renewed
2807 by the server), the client would continue to attempt to renew the same
2808 old address over and over. Now, the client will omit any expired
2809 addresses from future Confirm, Renew, or Rebind messages.
2811 - dhclient -6 will now select renew/rebind timers based upon the longest
2812 address expiration time rather than the shortest expiration time, in
2813 order to avoid cascading renewals in the event a server elects not to
2814 extend one of multiple IAADDR leases.
2816 - The server now limits clients that request multiple addresses to one
2817 address per IA by default, which can be adjusted through the
2818 "limit-addrs-per-ia" configuration option.
2820 - The DHCPv6 client now issues fresh transaction IDs on Renew and Rebind
2821 message exchanges, rather than using the most recent ID.
2823 - The DHCPv6 server now replies to Information-Request messages.
2825 - A bug was fixed in the dhclient-script for BSDs to correctly carry error
2826 codes through some conditions.
2828 - The parsing of some options in the dhclient lease file, in particular
2829 the success DHCPv6 status-code, was fixed.
2831 - A bug was fixed that caused the DHCPv6 ORO option to be corrupted with
2832 seemingly random values.
2834 - A reference overleak in DHCPv6 shared network processing was repaired.
2836 - ./configure now autodetects local database locations rather than trying
2837 to put dhcpd.leases and dhclient.leases in /usr/local/var/db, which no
2840 - Regression fix for bug where server advertised a IPv6 address in
2841 response to a SOLICIT but would not return the address in response
2844 - A bug was fixed where the DHCPv6 server puts the NoAddrsAvail status
2845 code in the IA_NA was fixed. The status code now appears in the root
2848 Changes since 4.0.0b2
2850 - Clarified error message when lease limit exceeded
2852 - Relative time may now be used as a qualifier for 'allow' and 'deny' access
2853 control lists. These directives may be used to assist in re-addressing
2854 address pools without having to constantly reconfigure the server. Please
2855 see 'man dhcpd.conf' for more information on allow/deny 'after time' syntax.
2856 Thanks to a patch from Christof Chen.
2858 - The server will now include multiple IA_NA's and multiple IAADDRs within
2859 them, if advertised by the client. It still only seeks to allocate one
2862 Changes since 4.0.0b1
2864 - Use different paths for PID and lease files when running in DHCPv4
2865 or DHCPv6 mode, so that servers for both protocols can be run
2866 simultaneously on a single interface.
2868 - Fixed a buffer overflow error which could have allowed a denial
2869 of service under unusual server configurations
2871 - Eliminated a spurious error message from the client
2873 - A number of bugs with the internal handling of lease state on the
2874 server have been fixed. Some of these could cause server crashes.
2876 - The peer_wants_leases() changes pulled up from 3.1.0 were corrected,
2877 'never used' leases will no longer consistently shift between servers
2878 on every pool rebalance run.
2880 - sendmsg()/recvmsg() control buffers are now declared in such a way to
2881 ensure they are correctly aligned on all (esp. 64-bit) architectures.
2883 - The client leasing subsystem was streamlined and corrected to account
2884 more closely for changes in client link attachment selection.
2886 Changes since 4.0.0a3
2888 - The DHCP server no longer requires a "ddns-update-style" statement,
2889 and now defaults to "none", which means DNS updates are disabled.
2891 - Log messages when failover peer names mismatch have been improved to
2892 point out the problem.
2894 - Bug where server advertised a IPv6 address in response to a SOLICIT
2895 but would not return the address in response to a REQUEST. Thanks to
2896 Dennis Kou for finding the bug.
2898 - Fixed an error causing the server to lock up on lease expiration,
2899 reported independently by Jothilingam Vasu and Dennis Kou.
2901 - Fixed a ./configure bug where compile tests were failing due to
2902 "-Werror" (unused variable) rather than the actual test failure. Lead
2903 to inconsistent and unworkable auto-configurations.
2905 - Compilation with DLPI and -Werror has been repaired.
2907 - Error in decoding IA_NA option if multiple interfaces are present
2908 fixed by Marcus Goller.
2910 - DHCPv6 server Confirm message processing has been enhanced - it no
2911 longer replies only to clients with host {} records, it now replies
2912 as directed in RFC3315 section 18.2.2 - that is, to all clients
2913 regardless of the existence of bindings.
2915 - A core dump during expired lease cleanup has been repaired.
2917 - DDNS updates state information are now stored in 'binding scopes' that
2918 follow the leases through their lifecycles. This enables DDNS teardowns
2919 on leases that are assigned and expired inbetween a server restart (the
2920 state is recovered from dhcpd.leases). Arbitrary user-specified binding
2921 scopes ('set var = "value";') are not yet supported.
2923 - Additional compilation problems on HP/UX have been repaired.
2925 Changes since 4.0.0a2
2927 - Fix for startup where there are no IPv4 addresses on an interface.
2928 Thanks to Marcus Goller for reporting the bug.
2930 - Fixed file descriptor leak on listen failure. Thanks to Tom Clark.
2932 - Bug in server configuration parser caused server to get stuck on
2933 startup for certain bad pool declarations. Thanks to Guillaume
2934 Knispel for the bug report and fix.
2936 - Code cleaned to remove warnings reported by "gcc -Wall".
2938 - DHCPv6 is now the default. You can disable DHCPv6 support using the
2939 "--disable-dhcpv6" flag when you run the configure script.
2941 - An internal database inconsistency bug was repaired where the server
2942 would segfault if a client attempted to renew a lease that had been
2943 loaded from persistent storage.
2945 - 'request' and 'also request' syntaxes have been added to accommodate
2946 the DHCPv6 client configuration. 'send dhcp6.oro' is no longer
2949 - Bug fixed where configuration file parsing did not work with
2950 zero-length options; this made it impossible to set the
2951 rapid-commit option.
2953 - Bogus messages about host records with IPv4 fixed-addresses being of
2954 non-128-bits in length were removed.
2956 Changes since 4.0.0a1
2958 - Bug in octal parsing fixed. Thanks to Bernd Fuhrmann for the report
2961 - Autoconf now supplies proper flags for Solaris DHCPv6 builds.
2963 - Fix for parsing error on some IPv6 addresses.
2965 - Invalid CIDR representation for IPv6 subnets or ranges now checked
2966 for when loading configuration.
2968 - Compilation on HP/UX has been repaired. The changes should generally
2969 apply to any architecture that supplies SIOCGLIFCONF but does not
2970 use 'struct lifconf' structures to pass values.
2972 - Two new operators, ~= and ~~, have been integrated to implement
2973 boolean matches by regular expression (such as may be used in
2974 class matching statements). Thanks to a patch by Alexandr S.
2975 Agranovsky, which underwent slight modification.
2977 - Fix for icmp packets on 64-bit systems (bug introduced in 4.0).
2979 - A bug was fixed in interface discovery wherein an error identifying
2980 a server-configured interface with no IPv4 addresses would SEGV.
2982 - Fixed a bug in which write_lease() might report a failure incorrectly
2984 - Added support for DHCPv6 Release messages
2986 - Added -x option to dhclient, which triggers dhclient processes
2987 to exit gracefully without releasing leases first
2989 - All binaries (client, server, relay) now change directories
2990 to / before going into daemon mode, so as not to hold $CWD open
2992 - Fixed a bug parsing DHCPv6 client-id's in host-identifier statements
2994 - Fixed a bug with the 'ddns-updates' boolean server configuration
2995 parameter, which caused the server to fail.
2997 Changes since 4.0.0-20070413
2999 - Old (expired) leases are now cleaned.
3001 - IPv6 subnets now have support for arbitrary allocation ranges via
3002 a new 'range6' configuration directive.
3004 - An obviated option code hash lookup to find D6O_CLIENTID was removed.
3006 - Corrected some situations where variables might be used without being
3009 - Silenced several other compiler warnings.
3011 - Include the more standard sys/uio.h rather than rely upon other
3012 header files to include it (fixes a BSD 4.2 compile failure).
3014 - Duplicate dhclient-script updates for DHCPv6 to all provided scripts.
3016 - DHCPv4 I/O methods that failed to sense hardware address were corrected.
3018 - DHCPv4 is now the default (as documented) rather than DHCPv6. The default
3019 was set to DHCPv6 to facilitate ease early development, and forgotten.
3021 - Corrected a segmentation violation in DHCPv4 socket processing.
3023 - dhclient will now fork() into the background once it binds to an
3024 IPv6 address, or immediately if the -n flag is supplied.
3026 - -q is now the default behaviour on dhclient, with -d or -v enabling
3027 non-quiet (stderr logging) mode.
3029 - Fix documentation of the domain-search atom (quoted, with commas).
3031 - Document DHCPv6 options presently in the default table.
3033 - Replaced ./configure shellscripting with GNU Autoconf.
3035 Changes since 3.1.0 (NEW FEATURES)
3037 - DHCPv6 Client and Server protocol support. Use '-6' to run the daemons
3038 as v6-only. Use '-4' to run the daemons as v4-only (default. There is
3039 no support currently for both.
3041 - Server support for multiple IA_NA options, containing at most one
3044 - Client support for one IA_NA option, containing any number of IAADDR
3047 - Server support for the DHCPv6 Information-request message.
3049 - Inappropriate unicast DHCPv6 messages sent to the server are now
3050 discarded, and this has rearchitected the IO system slightly.
3052 - The DHCPv6 server DUID defaults to type 1, is persistently stored in
3053 the leases database, and can be over-ridden (either completely, or by
3054 specifying type 1 or type 2).
3056 - The server only uses Rapid-Commit if it has been configured with the
3057 Rapid-Commit option and the client requests it.
3059 - DDNS support. We now update AAAA records in the same place we would
3060 update A records, if we have an IPv6 address. We also generate IP6.ARPA
3061 style names for PTR records if we're dealing with an IPv6 address. Both
3062 A and AAAA updates are done using the same 'fqdn.' virtual option space
3063 (although the DHCPv4 FQDN and DHCPv6 FQDN options are formatted
3064 differently, they both use the same code here).
3066 - The Linux dhclient-script attempts to set and remove assigned addresses,
3067 and to configure /etc/resolv.conf from nameserver and domain name
3068 configurations. It can be extended to configure other parameters.
3070 - Initial DHCPv6 lease support.
3072 - The IO system now tracks all local IP addresses, so that the DHCP
3073 applications (particularly the dhcrelay) can discern between what frames
3074 were transmitted to it, and what frames are being carried through it which
3075 it should not intercept.
3077 Changes since 3.1.0 (Maintenance)
3079 - A bug was repaired where MAC Address Affinity for virgin leases always
3080 mapped to the primary. Virgin leases now have an interleaved preference
3081 between primary and secondary.
3083 - A bug was repaired where MAC Address Affinity for clients with no client
3084 identifier was sometimes mishashed to the peer. Load balancing during
3085 runtime and pool rebalancing were opposing.
3087 - An assertion in lease counting relating to reserved leases was repaired.
3089 - The subnet-mask option inclusion now conforms with RFC2132 section 3.3;
3090 it will only appear prior to the routers option if it is present on the
3091 Parameter-Request-List. The subnet-mask option will also only be
3092 included by default (if it is not on the PRL) in response to DISCOVER
3093 or REQUEST messages.
3095 - The FQDN option is only supplied if the client supplied an FQDN option or
3096 if the FQDN option was explicitly requested on the PRL.
3098 - Dynamic BOOTP leases are now load balanced in failover.
3100 Changes since 3.1.0rc1
3102 - The parse warning that 'deny dynamic bootp;' must be configured for
3103 failover protected subnets was removed.
3105 Changes since 3.1.0b2
3107 - Failover rebalance events no longer play ping pong with round errors
3108 (moving leases between free and back to backup where there are an
3109 odd number of leases).
3111 - The 'pool' log line has been split into two messages, one before the
3112 rebalance run, and one after.
3114 - Any queued BNDACKs are transmitted before transmitting new BNDUPDs.
3115 This enforces the correct sequence of events for the remote server
3116 processing these messages.
3118 Changes since 3.1.0b1
3120 - Fixed a bug that caused OMAPI clients to freeze when opening lease
3123 - A new server config option "fqdn-reply" specifies whether the server
3124 should send out option 81 (FQDN). Defaults to "on". If set to "off",
3125 the FQDN option is not sent, even if the client requested it. This is
3126 needed because some clients misbehave otherwise. Thanks to Christof Chen
3129 - Allow trace output files (-tf option) to be overwritten, rather than
3130 crashing dhcpd if the file already exists
3132 - A bug was fixed that caused dhcpd to segfault if a pool was declared
3133 outside the scope of a subnet in dhcpd.conf.
3135 - Some uninitialized values were repaired in dhcpleasequery.c that
3136 caused the server to abort.
3138 - A new server config option, 'do-reverse-updates', has been added
3139 which causes the server to abstain from performing updates on PTR
3140 records. Thanks to a patch from Christof Chen at Allianz.
3142 - A bug was repaired in subencapsulation support, where spaces separated
3143 by empty spaces would not get included.
3145 - A bug in dhclient was repaired which caused it to send parameter request
3146 lists of 55 bytes in length no matter how long the declared PRL was.
3148 - 'dhcp.c(3953): non-null pointer' has been repaired. This fixes a flaw
3149 wherein the DHCPv4 server may ignore a configured server-identifier.
3151 - A flaw in failover startup sequences was repaired that sometimes left
3152 the primary DHCP server's pool rebalance schedules unscheduled.
3154 - Corrected a flaw that broke encapsulated spaces included due to presence
3155 on the parameter request list.
3157 Changes since 3.1.0a3
3159 - Some spelling fixes.
3161 Changes since 3.1.0a2
3163 - A bug was fixed where attempting to permit leasequeries results in a
3164 fatal internal error, "Unable to find server option 49".
3166 - A bug was fixed in dhclient rendering the textual output form of the
3167 domain-search option syntax.
3169 Changes since 3.1.0a1
3171 - A bug in the FQDN universe that added FQDN codes to the NWIP universe's
3172 hash table was repaired.
3174 - The servers now try harder to transmit pending binding updates when
3175 entering normal state.
3177 - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
3178 requeues all pending updates. This should reduce the number of spurious
3179 'xid mismatch' log messages.
3181 - An option definition referencing leak was fixed, which resulted in early
3182 termination of dhclient upon the renewal event.
3184 - Some default hash table sizes were tweaked, some upwards, some downwards.
3185 3.1.0a1's tables resulted in a reduction in default server memory use.
3186 The new selected values provide more of a zero sum (increasing the size
3187 of tables likely to be populated, decreasing the size of tables unlikely).
3189 - Lease structures appear in three separate hashes: by IP address, by UID,
3190 and by hardware address. One type of table was used for all three, and
3191 improvements to IP address hashing were applied to all three (so UID and
3192 hardware addresses were treated like 4-byte integers). There are now two
3193 types of tables, and the uid/hw hashes use functions more appropriate
3196 - The max-lease-misbalance percentage no longer causes scheduled rebalance
3197 runs to be skipped: it still governs the schedule, but every scheduled
3198 run will attempt balance.
3200 - A segfault bug in recursive encapsulation support has been corrected.
3202 Changes since 3.0 (New Features)
3204 - A workaround for certain STSN servers that send a mangled domain-name
3205 option was introduced for dhclient. The client will now accept corrupted
3206 server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
3207 or NAK). The server will continue to not accept corrupt client packets.
3209 - Support for 'reserved' (pseudo-static) and BOOTP leases via failover
3212 - Support for adding, removing, and managing class and subclass statements
3215 - The failover implementation was updated to comply with revision 12 of
3218 - 'make install' now creates the initial zero-length dhcpd.leases file if
3219 one does not already exist on the system.
3221 - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
3223 - The Load Balance Algorithm was misimplemented. The current implementation
3226 - lcase() and ucase() configuration expressions have been added which adjust
3227 their arguments from upper to lower and lower to upper cases respectively.
3228 Thanks to a patch from Albert Herranz.
3230 - The dhclient 'reject ...;' statement, which rejects leases given by named
3231 server-identifiers, now permits address ranges to be specified in CIDR
3232 notation. Thanks to a patch from David Boyce.
3234 - The subnet-mask option is now supplied by default, but at lowest
3235 priority. This helps a small minority of clients that provide parameter
3236 request lists, but do not list the subnet-mask option because they were
3237 designed to interoperate with a server that behaves in this manner.
3239 - The FQDN option is similarly supplied even if it does not appear on the
3240 parameter request list, but not to the exclusion of options that do
3241 appear at the parameter request list. Up until now it had ultimate
3242 priority over the client's parameter request list.
3244 - Varying option space code and length bit widths (8/16/32) are now
3245 supported. This is a milestone in achieving RFC 3925 "VIVSO" and
3248 - A new common (server or client) option, 'db-time-format local;', has
3249 been added which prints the local time in /var/db/dhcpd.leases rather
3250 than UTC. Thanks to a patch from Ken Lalonde.
3252 - Some patches to improve DHCP Server startup speed from Andrew Matheson
3253 have been incorporated.
3255 - Failover pairs now implement 'MAC Affinity' on leases moving from the
3256 active to free states. Leases that belonged to the failover secondary
3257 are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
3258 If lease rebalancing must move leases, it tries first to move leases
3259 that belong to the peer in need.
3261 - The server no longer sends POOLREQ messages unless the pool is severely
3262 misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
3264 - Pool rebalance events no longer happen upon successfully allocating a
3265 lease. Instead, they happen on a schedule. See 'man dhcpd.conf' for the
3266 min-balance and max-balance statements for more information.
3268 - The DHCP Relay Agent Information Option / Link Selection Sub-Option
3269 is now supported. (See RFC3527 for details).
3271 - A new DDNS related server option, update-conflict-detection, has been
3272 added. If this option is enabled, dhcpd will perform normal DHCID
3273 conflict resolution (the default). If this option is disabled, it will
3274 instead trust the assigned name implicitly (removing any other bindings
3275 on that name). This option has not been made available in dhclient.
3277 - In those cases where the DHCP software manufactures an IP header (to
3278 transmit via bpf, lpf, etc), the IP TTL the software selects has been
3279 increased from 16 to 128. This is intended to match Microsoft Windows
3280 DHCP Client behaviour, to increase compatibility.
3282 - 'ignore client-updates;' now has behaviour that is different from
3283 'deny client-updates;'. The client's request is not truly ignored,
3284 rather it is encouraged. Should this value be configured, the server
3285 updates DNS as though client-updates were set to 'deny'. That is, it
3286 enters into DNS whatever it is configured to do already, provided it is
3287 configured to. Then it sends a response to the client that lets the
3288 client believe it is performing client updates (which it will), probably
3289 for a different name. In essence, this lets the client do as it will,
3290 ignoring this aspect of their request.
3292 - Support for compressed 'domain name list' style DHCP option contents, and
3293 in particular the domain search option (#119) was added.
3295 - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
3296 LEASEQUERY lets you query the DHCP server for information about a lease,
3297 using either an IP address, MAC address, or client identifier. Thanks
3298 to a patch from Justin Haddad.
3300 - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
3301 ethernet mac address) on the SCO platform specifically without any strange
3302 ifconfig hacks. Many thanks go to the Kroger Co. for donating the
3303 hardware and funding the development.
3305 - A new common configuration executable statement, execute(), has been
3306 added. This permits dhcpd or dhclient to execute a named external
3307 program with command line arguments specified from other configuration
3308 language. Thanks to a patch written by Mattias Ronnblom, gotten to us
3311 - A new dhcp server option 'adaptive-lease-time-threshold' has been added
3312 which causes the server to substantially reduce lease-times if there are
3313 few (configured percentage) remaining leases. Thanks to a patch submitted
3316 - Encapsulated option spaces within encapsulated option spaces is now
3319 Changes since 3.0.6rc1
3321 - supersede_lease() now requeues leases in their respective hardware
3322 address hash bucket. This mirrors client identifier behaviour.
3326 - Assorted fixes for broken network devices: Packet length is now
3327 determined from the IP header length field to finally calculate the
3328 UDP payload length, because some NIC drivers return more data than
3329 they actually received.
3331 - UDP packets are now stored in aligned data structures.
3333 - A logic error in omapi interface code was repaired that might result in
3334 incorrectly indicating 'up' state when any flags were set, rather than
3335 specifically the INTERFACE_REQUESTED flag. Thanks to a patch from
3336 Jochen Voss which got to us via Andrew Pollock at Debian.
3338 - A reference leak on binding scopes set by ddns updates was repaired.
3340 - A memory leak in the minires_nsendsigned() function call was repaired.
3341 Effectively, this leaked ~176 bytes per DDNS update.
3343 - In the case where an "L2" DHCP Relay Agent (one that does not set giaddr)
3344 was directly attached to the same broadcast domain as the DHCP server,
3345 the RFC3046 relay agent information option was not being returned to the
3346 relay in the server's replies. This was fixed; the dhcp server no longer
3347 requires the giaddr to reply with relay agent information. Note that
3348 this also improves compatibility with L2 devices that "intercept" DHCP
3349 packets and expect relay agent information even in unicast (renewal)
3350 replies. Thanks to a patch from Pekka Silvonen.
3352 - A bug was fixed where the BOOTP header 'sname' field had a value, the
3353 copy written to persistent storage was actually the contents of the
3356 - A bug was fixed where the nwip virtual option space was referencing
3357 the fqdn option's virtual option space's option cache.
3359 - Timestamp parsing errors that indicated missing "minutes" fields rather
3360 than the actually missing "seconds" fields have been repaired thanks to
3361 a patch from Kevin Steves.
3363 - A grammar error in the dhclient.8 manpage was repaired thanks to a patch
3366 - Several spelling typos were repaired, and some cross-references to other
3367 relevant documents were included in the manpages, thanks to a patch
3368 by Andrew Pollock which got to us via Tomas Pospisek.
3370 - Some bugs were fixed in the 'emergency relay agent options hologram'
3371 which is used to retain relay agent option contents from when the
3372 client was in INIT or REBIND states. This should solve problems where
3373 relay agent options were not echoed from the server, even when giaddr
3376 - dhclient now closes its descriptor to dhclient.leases prior to executing
3377 dhclient-script. Thanks to a patch from Tomas Pospisek.
3379 - The server's "by client-id" and "by hardware address" hash table lists
3380 are now sorted according to the preference to re-allocate that lease to
3381 returning clients. This should eliminate pool starvation problems
3382 arising when "INIT" clients were given new leases rather than presently
3385 Changes since 3.0.5rc1
3387 - A bug was repaired in fixes to the dhclient, which sought to run the
3388 dhclient-script with the 'EXPIRE' state should it receive a NAK in
3389 response to a REQUEST. The client now iterates the PREINIT state
3390 after the EXPIRE state, so that interfaces that might be configured
3391 'down' can be brought back 'up' and initialized.
3393 - DHCPINFORM handling for clients that properly set ciaddr and come to the
3394 server via a relay aget has been repaired.
3398 - A warning that host statements declared within subnet or shared-network
3399 scopes are actually global has been added.
3401 - The default minimum lease time (if min-lease-time was not specified)
3402 was raised from 0 to 300. 0 is not thought to be sensible, and is
3403 known to be damaging.
3405 - Added additional fatal error sanity checks surrounding lease binding
3406 state count calculations (free/active counts used for failover pool
3409 - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
3410 misapplied to server values rather than client values. The server no longer
3411 advertises 8-byte lease-time options when on 64-bit platforms.
3413 - A bug where leases not in ACTIVE state would get billed to billed classes
3414 (classes with lease limitations) was fixed. Non-active leases OFFERed
3415 to clients are no longer billed (but billing is checked before offering).
3417 - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
3418 configuration option - the default configuration and results should be
3421 - If the dhclient were to receive a DHCPNAK while it was in the RENEW
3422 state (and consequently, had an active, 'bound' address and related
3423 configuration options), it would fail to 'tear down' this information
3424 before proceeding into INIT state. dhclient now iterates the dhclient-
3425 script with the 'EXPIRE' action to cause these teardowns prior to entering
3426 INIT state. Thanks to a patch from Chris Zimmerman.
3428 - The omapi.1 manpage had some formatting errors repaired thanks to a patch
3429 from Yoshihiko Sarumaru.
3431 - A few lines of code that were failover-specific were moved within
3432 #if defined() clauses so that compilation without failover could be
3435 - The log message emitted when the 'leased-address' value was not available
3436 in dhcpd.conf "executable statements" has been updated to be more helpful.
3437 Manpage information for this value has also been updated.
3439 - Abandoned or dissociated (err condition) leases now remove any related
3440 dynamic dns bindings. Thanks to a patch from Patrick Schoo.
3442 - Attempting to write a new lease file to replace a corrupt (due to
3443 encountering non-retryable errors during writing) lease file should
3444 no longer result in an infinite recursion.
3446 - Host declaration hardware addresses and client identifiers may only be
3447 configured once. dhcpd will now fail to load config files that specify
3448 multiple identifiers (previous versions would silently over-ride the
3449 value with the later configured value).
3451 - Several option codes that have been allocated since our last release
3452 have been named and documented.
3454 - Option names of the form "unknown-123" have been removed from the in-
3455 memory hash tables. In order to support options of these names that
3456 may appear in dhclient.leases or similar in previous versions, the
3457 parser will now find the new option code definition, or mock up a
3458 generic option code definition. This should result in a smooth
3459 transition from one name to the other, as the new name is used to
3462 Changes since 3.0.4rc1
3464 - The dhcp-options.5 manpage was updated to correct indentation errors
3465 thanks to a patch from Jean Delvare.
3467 Changes since 3.0.4b3
3469 - Some manual pages were clarified pursuant to discussion on the dhcp-server
3472 Changes since 3.0.4b2
3474 - Null-termination sensing for certain clients that unfortunately require
3475 it in DHCPINFORM processing was repaired.
3477 - The host-name option and a few others were moved from "X" format to "t"
3478 format to be compatible with new NULL handling functions.
3480 - DHCPINFORM processing is a little more careful about return addressing
3481 its responses, or if responding via a relay. The INFORM related
3482 messages also log the 'effective client ip address' rather than the
3483 client's supplied ciaddr (since some clients produce null ciaddrs).
3485 - The server was inappropriately sending leases to the RESET state in the
3486 event that multiple active leases were found to match a singly-identified
3487 client. This was changed to RELEASED (by accepting a different, ACTIVE
3488 binding, the client is implicitly releasing its lease). This repairs a
3489 bug wherein secondary servers in failover pairs detecting this condition
3490 move leases to RESET, and primaries refuse to accept that state
3491 transition (properly).
3493 - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
3495 Changes since 3.0.4b1
3497 - Command line parsing in omshell was repaired - it no longer closes
3498 STDIN after reading one line.
3500 - The resolver library no longer closes the /etc/resolv.conf file
3501 descriptor it opened twice.
3503 - Changes to trailing NULL removal in 't' option-atoms has been rethought,
3504 it now includes 'd' (domain name) types, and tries hard not to rewind an
3505 option beyond the start of the text field it is un-terminating.
3509 - A DDNS update handling function was misusing the DNS error codes, rather
3510 than the internal generic result enumeration. The result is a confusing
3511 syslog line, logging the wrong condition.
3513 - The DHCP Server was not checking pool balance in the case where it brought
3514 a non-ACTIVE lease out of storage for a client that was returning to use
3515 a lease it once had long ago, and had since expired.
3517 - Failover peers no longer bother to look for free leases to allocate when
3518 they already found the client's ACTIVE lease. DISCOVERs are load balanced
3519 whether freely-allocated or not, unless the server doubts the peer has
3522 - Fixed a bug in dhcrelay agent addition code that suppressed trailing
3523 PAD options - it was suppressing only one trailing PAD option, rather
3524 than the entire block of them.
3526 ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
3527 option addition and stripping code. Added a few sanity checks. Although
3528 highly improbable, due to requiring the reception of a DHCP datagram well
3529 in excess of all known to be used physical MTU limitations, it is possible
3530 this may have been used in a stack overflow security vulnerability. Thanks
3531 to a patch from infamous42md.
3533 ! Added some sanity checks to OMAPI connection/authentication code.
3534 Although highly improbable, due to having to deliver in excess of 2^32
3535 bytes of data via the OMAPI channel, not to mention requiring dhcpd to
3536 be able to malloc() a memory region 2^32 bytes in size, it was possible
3537 this might have resulted in a heap overflow security vulnerability.
3538 Thanks to a patch from infamous42md.
3540 - dmalloc() memset()'s the non-debug (data) portion of the allocated
3541 memory to zero. Code that memset()'s the result returned by dmalloc() to
3542 zero is redundant. These redundancies were removed.
3544 - Some type declaration corrections to u_int16_t were made in common/tr.c
3545 (Token Ring support) thanks to a patch from Jason Vas Dias at Red Hat.
3547 - A failover bug that was allowing leases that EXPIRED or were RELEASED
3548 where tsfp and tstp are identical timestamps to languish in these
3549 transitional states has been repaired. As a side effect, lease
3550 databases should be kept more consistent overall, not just for these
3551 transitional states.
3553 - If the lease db is deleted out from under the daemon, and it moves to rewrite
3554 the db, it will go ahead with the operation and move the new db into place
3555 once it detects the old db does not exist.
3557 - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
3558 is either nonsensical or (in the case of IEEE1394) is not known to support
3559 these interfaces. Thanks to Marius Gedminas and Andrew Pollock of Debian.
3561 - Some previously undocumented reasons for dhclient-script invoking has
3562 been documented in the dhclient-script.8 manpage.
3564 - Failover potential expiry calculations (TSTP) have been corrected. Results
3565 should be substantially more consistent, and proper given the constraints.
3567 - Adjusted lease state validation checks in potential-conflict, to
3568 account for possible clock skew similarly to normal state, and several
3569 previously illegal transitions were made legal (ex: active->released).
3571 - An impossible sanity check was removed from omapi/buffer.c, thanks to a
3572 patch from 'infamous42md'.
3574 - An OMAPI host/network byte order problem in lease time values has been
3577 - Several minor bugs, largely relating to treating 8-byte time values as
3578 4-byte entities, have been repaired after careful review of the FreeBSD
3579 ports collection's patch set. Thanks to the nameless entities who have
3580 contributed to the FreeBSD ports.
3582 - When writing a trace file, the file is now created with permissions 0600,
3583 to help administrators avoid accidentally publicising sensitive config
3586 - The calculation of the maximum size of DHCP packets no longer includes
3587 Ethernet framing overhead. The result is that the 'Maximum Message
3588 Size' option advertised by clients, or the default value 576, is no
3589 longer reduced by 14 bytes, and instead directly reflects the IP level
3590 MTU (and the default, minimum allowed IP MTU of 576).
3592 - The special status of RELEASED/EXPIRED/RESET leases when a server
3593 is operating in partner-down was fixed. It no longer requires a
3594 lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
3595 event to turn these into FREE leases without peer acknowledgement
3596 (after STOS+MCLT) has been repaired.
3598 - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
3601 - "append"ing a string onto the end of a "t" type option (such as the
3602 domain-name field) that had been improperly NULL-terminated by the
3603 DHCP server will no longer result in a truncated string containing
3604 only the option from the server, and not the expected appended value.
3605 Thanks to a patch from Jason Vas Dias at Red Hat.
3607 - File handlers on configuration state (config files and lease dbs) should
3608 be treated consistently, regardless of whether TRACING is defined or not.
3610 - The Linux build environment has had some minor improvements - better
3611 sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
3612 and corrections to #if operators regarding LINUX_MAJOR should it ever
3615 - The server now tries harder to survive the condition where it is unable
3616 to open a new lease file to rewrite the lease state database.
3618 Changes since 3.0.3b3
3620 - dhclient.conf documentation for interface {} was updated to reflect recent
3621 discussion on the dhcp-hackers mailing list.
3623 - In response to reports that the software does not compile on GCC 4.0.0,
3624 -Werror was removed from Makefile.conf for all platforms that used it.
3625 We will address the true problem in a future release; this is a temporary
3628 Changes since 3.0.3b2
3630 - An error in code changes introduced in 3.0.3b2 was corrected, which caused
3631 static BOOTP clients to receive random addresses.
3633 Changes since 3.0.3b1
3635 - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
3636 host records would be left behind on leases that were not allocated to the
3637 client currently booting (eg in the case where the host was denied booting).
3639 - The dhcpd.conf.5 manpage was updated to be more clear in regards to
3640 multiple host declarations (thanks to Vincent McIntyre). 'Interim' style
3641 dynamic updates were also retouched.
3645 - A bug was fixed where a server might load balance a DHCP REQUEST to its
3646 peer after already choosing not to load balance the preceding DISCOVER.
3647 The peer cannot allocate the originating server's lease.
3649 - In the case where a secondary server lost its stable storage while the
3650 primary was still in communications-interrupted, and came back online,
3651 the lease databases would not be fully transferred to the secondary.
3652 This was due to the secondary errantly sending an extra UPDREQ message
3653 when the primary made its state transition to PARTNER-DOWN known.
3655 - The package will now compile cleanly in gcc 3.3 and 3.4. As a side effect,
3656 lease structures will be 9 bytes smaller on all platforms. Thanks to
3657 Jason Vas Dias at Red Hat.
3659 - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
3660 properly restricted to only detecting broadcast interfaces. Thanks
3661 to a patch from Jason Vas Dias at Red Hat.
3663 - decode_udp_ip_header was changed so that the IP address was copied out
3664 to a variable, rather than referenced by a pointer. This enforces 4-byte
3665 alignment of the 32-bit IP address value. Thanks to a patch from Dr.
3668 - An incorrect log message was corrected thanks to a patch from
3671 - A bug in DDNS was repaired, where if the server's first DDNS action was
3672 a DDNS removal rather than a DDNS update, the resolver library's
3673 retransmit timer and retry timer was set to the default, implying a
3674 15 second timeout interval. Which is a little excessive in a synchronous,
3675 single-threaded system. In all cases, ISC DHCP should now hold fast to
3676 a 1-second timeout, trying only once.
3678 - The siaddr field was being improperly set to the server-identifier when
3679 responding to DHCP messages. RFC2131 clarified the siaddr field as
3680 meaning the 'next server in the bootstrap process', eg a tftp server.
3681 The siaddr field is now left zeroed unless next-server is configured.
3683 - mockup_lease() could have returned in an error condition (or in the
3684 condition where no fixed-address was found matching the shared
3685 network) with stale references to a host record. This is probably not
3686 a memory leak since host records generally never die anyway.
3688 - A bug was repaired where failover servers would let stale client identifiers
3689 persist on leases that were reallocated to new clients not sending an id.
3691 - Binding scopes ("set var = value;") are now removed from leases allocated
3692 by failover peers if the lease had expired. This should help reduce the
3693 number of stale binding scopes on leases.
3695 - A small memory leak was closed involving client identifiers larger than
3696 7 bytes, and failover.
3698 - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
3699 cause an internal function to overflow heap. Thanks to Jason Vas Dias
3702 - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
3703 or 'NUMBER_OR_NAME' was repaired. Hexadecimal parsing is affected, and
3706 - In several cases, parse warnings were being issued before the lexical
3707 token had been advanced to the token whose value was causing an error...
3708 causing parse warnings to claim the problem is on the wrong token.
3710 - Host declarations matching on client identifier for dynamic leases will
3711 no longer match fixed-address host declarations (this is now identical
3712 to behaviour for host records matching on hardware address).
3714 Changes since 3.0.2rc3
3716 - A previously undocumented configuration directive, 'local-address',
3717 was documented in the dhcpd.conf manpage.
3719 Changes since 3.0.2rc2
3721 - Two variables introduced in 3.0.2b1 were used without being initialized
3722 in the case where neither the FILE nor SNAME fields were available for
3723 overloading. This was repaired.
3725 - A heretofore believed to be impossible corner case of the option
3726 overloading implementation turned out to be possible ("Unable to sort
3727 overloaded options after 10 tries."). The implementation was reworked
3728 to consider the case of an option so large it would require more than
3729 three chunks to fit.
3731 - Many other instances of variables being used without being initialized
3734 - An uninitialized variable in omapi_io_destroy() led to the discovery
3735 that this function may result in orphaned pointers (and hence, a memory
3738 Changes since 3.0.2rc1
3740 - allocate_lease() was rewritten to repair a bug in which the server would
3741 try to allocate an ABANDONED lease when FREE leases were available.
3743 Changes since 3.0.2b1
3745 - Some dhcp-eval.5 manpage formatting was repaired.
3749 - A bug was fixed in the server's 'option overloading' implementation,
3750 where options loaded into the 'file' and 'sname' packet fields were
3751 not aligned precisely as rfc2131 dictates.
3753 - The FreeBSD client script was changed to support the case where a domain
3754 name was not provided by the server.
3756 - A memory leak in 'omshell' per each command line parsed was
3757 repaired, thanks to a patch from Jarkko Torppa.
3759 - Log functions writing to stderr were adjusted to use the STDERR_FILENO
3760 system definition rather than '2'. This is a no-op for 90% of platforms.
3762 - One call to trace_write_packet_iov() counted the number of io vectors
3763 incorrectly, causing inconsistent tracefiles. This was fixed.
3765 - Some expression parse failure memory leaks were closed.
3767 - A host byte order problem in tracefiles was repaired.
3769 - Pools configured in DHCPD for failover possessing permission lists that
3770 previously were assumed to not include dynamic bootp clients are now
3771 a little more pessimistic. The result is, dhcpd will nag you about just
3772 about most pools that possess a 'allow' statement with no 'deny' that
3773 would definitely match a dynamic bootp client.
3775 - The 'ddns-update-style' configuration warning bit now insists that
3776 the configuration be globally scoped.
3778 - Two memory leaks in dhclient were closed thanks to a patch from Felix
3781 - Some minor but excellently pedantic documentation errors were fixed
3782 thanks to a patch from Thomas Klausner.
3784 - Bugs in operator precedence in executable statements have been repaired
3785 once again. More legal syntaxes should be parsed legally.
3787 - Failing to initialize a tracefile for any reason if a tracefile was
3788 specified is now a fatal error. Thanks to a patch from Albert Herranz.
3790 - Corrected a bug in which the number of leases transferred as calculated
3791 by the failover primary and sent to peers in POOLRESP responses may be
3792 incorrect. This value is not believed to be used by other failover
3793 implementations, excepting perhaps as logged information.
3795 - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
3796 sending POOLREQ messages instead of POOLRESP mesasges. This message
3797 was essentially ignored since failover secondaries effectively do not
3798 respond to POOLREQ messages.
3800 - Type definitions for various bitwidths of integers in the sunos5-5
3801 build of ISC DHCP have been fixed. It should compile and run more
3802 easily when built in 64-bit for this platform.
3804 - "allow known-clients;" is now a legal syntax, to avoid confusion.
3806 - If one dhcp server chooses to 'load balance' a request to its failover
3807 peer, it first checks to see if it believes said peer has a free
3808 lease to allocate before ignoring the DISCOVER.
3810 - log() was logging a work buffer, rather than the value returned by
3811 executing the statements configured by the user. In some cases,
3812 the work buffer and the intended results were the same. In some other
3813 cases, they were not. This was fixed thanks to a patch from Gunnar
3814 Fjone and directconnect.no.
3816 - Compiler warnings for some string type conversions was fixed, thanks
3817 to Andreas Gustafsson.
3819 - The netbsd build environments were simplified to one, in which
3820 -Wconversion is not used, thanks to Andreas Gustafsson.
3822 - How randomness in the backoff-cutoff dhclient configuration variable
3823 is implemented was better documented in the manpage, and the behaviour
3824 of dhclient in REQUEST timeout handling was changed to match that of
3825 DISCOVER timeout handling.
3827 - Omapi was hardened against clients that pass in null values, thanks
3828 to a patch from Mark Jason Dominus.
3830 - A bug was fixed in dhclient that kept it from doing client-side
3831 ddns updates. Thanks to a patch from Andreas Gustafsson, which
3832 underwent some modification after review by Jason Vas Dias.
3834 - Failover implementations disconnected due to the network between
3835 them (rather than one of the two shutting down) will now try to
3836 re-establish the failover connection every 5 seconds, rather than
3837 to simply try once and give up until one of them is restarted.
3838 Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
3839 by Greger V. Teigre which led to an enhancement to it.
3841 - A problem that kept DHCP Failover secondaries from tearing down
3842 ddns records was repaired. Thanks to a patch from Ulf Ekberg from
3845 - 64bit pointer sizes are detected properly on FreeBSD now.
3847 - A bug was repaired where the DHCP server would leave stale references
3848 to host records on leases it once thought about offering to certain
3849 clients. The result would be to apply host and 'known' scopes to the
3850 wrong clients (possibly denying booting). NOTE: The 'mis-host' patch
3851 that was being circulated as a workaround is not the way this bug was
3852 fixed. If you were a victim of this bug in 3.0.1, you are cautioned
3853 to proceed carefully and see if it fixes your problem.
3855 - A bug was repaired in the server's DHCPINFORM handling, where it
3856 tried to divine the client's address from the source packet and
3857 would get it wrong. Thanks to Anshuman Singh Rawat.
3859 - A log message was introduced to help illuminate the case where the
3860 server was unable to find a lease to assign to any BOOTP client.
3861 Thanks to Daniel Baker.
3863 - A minor dhcpd.conf.5 manpage error was fixed.
3865 Changes since 3.0.1rc14
3867 - The global variable 'cur_time' was centralized and is now uniformly of a
3868 type #defined in system-dependent headers. It had previously been defined
3869 in one of many places as a 32-bit value, and this causes mayhem on 64-bit
3870 big endian systems. It probably wasn't too healthy on little endian
3873 - A printf format string error introduced in rc14 was repaired.
3875 - AIX system-dependent header file was altered to only define NO_SNPRINTF
3876 if the condition used to #ifdef in vsnprintf in AIX' header files
3879 - The Alpha/OSF system-dependent header file was altered to define
3880 NO_SNPRINTF on OS revisions older than 4.0G.
3882 - omapip/test.c had string.h added to its includes.
3884 Changes since 3.0.1rc13
3886 ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
3887 in logging messages with excessively long hostnames provided by the
3888 clients. It is highly probable that these could have been used by
3889 attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
3890 release candidates 12 or 13. Special thanks to Gregory Duchemin for
3891 both finding and solving the problem.
3893 ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
3894 in log_*() functions was evidenced, on some specific platforms where
3895 vsnprintf() was not believed to be available and calls were wrapped to
3896 sprintf() instead. Again, credit goes to Gregory Duchemin for finding
3897 the problem. Calls to snprintf() are now linked to a distribution-local
3898 snprintf implementation, only in those cases where the architecture is
3899 not known to provide one (see includes/cf/[arch].h). If you experience
3900 linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
3901 is where to look. This vulnerability did not exist in any previously
3902 published version of ISC DHCP.
3904 - Compilation on hpux 11.11 was repaired.
3906 - 'The cross-compile bug fix' was backed out.
3908 Changes since 3.0.1rc12
3910 - Fixed a bug in omapi lease lookup function, to form the hardware
3911 address for the hash lookup correctly, thanks to a patch from
3914 - Fixed a bug where dhcrelay was sending relayed responses back to the
3915 broadcast address, but with the source's unicast mac address. Should
3916 now conform to rfc2131 section 4.1.
3918 - Cross-compile bug fix; use $(AR) instead of ar. Thanks to Morten Brorup.
3920 - Fixed a crash bug in dhclient where dhcpd servers that do not provide
3921 renewal times results in an FPE. As a side effect, dhclient can now
3922 properly handle 0xFFFFFFFF (-1) expiry times supplied by servers. Thanks
3923 to a patch from Burt Silverman.
3925 - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
3926 and reformatted to correct a compilation error on Solaris platforms.
3928 - A patch was applied which fixes a case where leases read from the
3929 leases database do not properly over-ride previously read leases.
3931 - dhcpctl.3 manpage was tweaked.
3933 Changes since 3.0.1rc11
3935 - A patch from Steve Campbell was applied with minor modifications to
3936 permit reverse dns PTR record updates with values containing spaces.
3938 - A patch from Florian Lohoff was applied with some modifications to
3939 dhcrelay. It now discards packets whose hop count exceeds 10 by default,
3940 and a command-line option (-c) can be used to set this threshold.
3942 - A failover bug relating to identifying peers by name length instead of
3945 - Declaring failover configs within shared-network statements should no
3946 longer result in error.
3948 - The -nw command line option to dhclient now works.
3950 - Thanks to a patch from Michael Richardson:
3951 - Some problems with long option processing have been fixed.
3952 - Some fixes to minires so that updates of KEY records will work.
3954 - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
3955 see contrib/ms2isc/readme.txt for revision notes.
3957 - Dhclient no longer uses shell commands to kill another instance of
3958 itself, it sends the signal directly. Thanks to a patch from Martin
3961 - The FreeBSD dhclient-script was changed so that a failure to write to
3962 /etc/resolv.conf does not prematurely end the script. This keeps dhclient
3963 from looping infinitely when this is the case. Thanks to a patch from
3966 - A patch from Bill Stephens was applied which resolves a problem with lease
3967 expiry times in failover configurations.
3969 - A memory leak in configuration parsing was closed thanks to a patch from
3972 - The function which discovers interfaces will now skip non-broadcast or
3973 point-to-point interfaces, thanks to a patch from David Brownlee.
3975 - Options not yet known by the dhcpd or dhclient have had their names
3976 changed such that they do not contain # symbols, in case they should ever
3977 appear in a lease file. An option that might have been named "#144" is
3980 - Another patch from Bill Stephens which allows the ping-check timeout to
3981 be configured as 'ping-timeout'. Defaults to 1.
3983 Changes since 3.0.1rc10
3985 - Potential buffer overflows in minires repaired.
3987 - A change to the linux client script to use /bin/bash, since /bin/sh may
3990 - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
3992 - A correction of boolean parsing syntax validation - some illegal syntaxes
3993 that worked before are now detected and produce errs, some legal syntaxes
3994 that errored before will now work properly.
3996 - Some search-and-replace errors that caused some options to change their
3999 - Shu-min Chang of the Intel corporation has contributed a perl script and
4000 module that converts the MS NT4 DHCP configuration to a ISC DHCP3
4003 - Applied the remainder of the dhcpctl memory leak patch provided by Bill
4004 Squier at ReefEdge, Inc. (groo@reefedge.com).
4006 - Missing non-optional failover peer configurations will now result in a soft
4007 error rather than a null dereference.
4009 Changes since 3.0.1rc9
4011 - A format string was corrected to fix compiler warnings.
4013 - A number of spelling corrections were made in the man pages.
4015 - The dhclient.conf.5 man page was changed to refer to do-forward-updates
4016 rather than a configuration option that doesn't exist.
4018 - A FreeBSD-specific bug in the interface removal handling was fixed.
4020 - A Linux-specific Token Ring detection problem was fixed.
4022 - Hashes removed from as-yet-unknown agent options, having those options
4023 appear in reality before we know about them will no longer produce
4024 self-corrupting lease databases.
4026 - dhclient will use the proper port numbers now when using the -g option.
4028 - A order-of-operations bug with 2 match clauses in 1 class statement is
4029 fixed thanks to a patch from Andrew Matheson.
4031 - Compilation problems on Solaris were fixed.
4033 - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
4035 - A fix to the dhcp ack process which makes certain group options will be
4036 included in the first DHCPOFFER message was made thanks to a patch from
4039 - A few memory leaks were repaired thanks to patches from Bill Squier at
4040 ReefEdge, Inc. (groo@reefedge.com).
4042 - A fix for shared-networks that sometimes give clients options for the
4043 wrong subnets (in particular, 'option routers') was applied, thanks to
4044 Ted Lemon for the patch.
4046 - Omshell's handling of dotted octets as values was changed such that dots
4047 one after the other produce zero values in the integer string.
4049 Changes since 3.0.1rc8
4051 - Fix a format string vulnerability in the server that could lead to a
4052 remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
4054 - Add additional support for NetBSD/sparc64.
4056 - Fix a bug in the command-line parsing of the client. Also, resolve
4059 - Add better support for shells other than bash in the Linux client
4062 - Various build fixes for modern versions of FreeBSD and Linux.
4064 - Fix a bad bounds check when printing binding state names.
4066 - Clarify documentation about fixed-address and multiple addresses.
4068 - Fix a typo in the authoritative error message.
4070 - Make a log entry when we can't write a billing class.
4072 - Use conversion targets that are the right size on all architectures.
4074 - Increment the hop count when relaying.
4076 - Log a message when lease state is changed through OMAPI.
4078 - Don't rerun the shared_network when evaluating the pool.
4080 - Fix a reversed test in the parser.
4082 - Change the type of rbuf_max.
4084 - Make FTS_LAST a manifest constant to quiet warnings.
4086 Changes since 3.0.1rc7
4088 - Fix two compiler warnings that are generated when compiling on Solaris
4089 with gcc. These stop the build, even though they weren't actually
4090 errors, because we prefer that our builds generate no warnings.
4092 Changes since 3.0.1rc6
4094 - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
4097 - Implement lease stealing for cases where the primary has fewer leases
4098 than the secondary, as called for by the standard.
4100 - Add a fudge factor to the lease expiry acceptance code, (suggested
4101 by Kevin Miller of CMU).
4103 - Fix a bug in permit_list_match that made it much too willing to say
4104 that two permit lists matched.
4106 - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
4107 also more compact) messages about DNS updates.
4109 - Fix a bug in generating wire-format domain names for the FQDN option.
4111 - Fix a bug where the FQDN option would not be returned if the client
4112 requested it, contrary to the standard.
4114 - On Darwin, use the FreeBSD DHCP client script.
4116 - On NetBSD/sparc, don't check for casting warnings.
4118 - Add a flag in the DHCP client to disable updating the client's A
4119 record when sending an FQDN option indicating that the client is
4120 going to update its A record.
4122 - In the client, don't attempt a DNS update until one second after
4123 configuring the new IP address, and if the update times out, keep
4124 trying until a response, positive or negative, is received from the
4127 - Fix an uninitialized memory bug in the DHCP client.
4129 - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
4131 - Fix a bug in ns_parserr(), where it was returning the wrong sort
4132 of result code in some cases (suggested by Ben Harris of the
4135 - Fix a bug in is_identifier(), where it was checking against EOF
4136 instead of the END_OF_FILE token (also suggested by Ben Harris).
4138 - Fix a bug where if an option universe contained no options, the
4139 DHCP server could dump core (Walter Steiner).
4141 - Fix a bug in the handling of encapsulated options.
4143 - Fix a bug that prevented NWIP suboptions from being processed.
4145 - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
4146 as modifier flags to the FTS_ACTIVE state, as called for in the
4147 failover protocol standard.
4149 - Fix bugs in the pool merging code that resulted in references and
4150 dereferences of null pointers. This bug had no impact unless the
4151 POINTER_DEBUG flag was defined.
4153 - In the server, added a do-forward-updates flag that can be used to
4154 disable forward updates in all cases, so that sites that want the
4155 clients to take sole responsibility for updating their A record can
4158 - Make it possible to disable optimization of PTR record updates.
4160 Changes since 3.0.1rc5
4162 - Include some new documentation and changes provided by Karl Auer.
4164 - Add a workaround for some Lexmark printers that send a double-NUL-
4165 terminated host-name option, which would break DNS updates.
4167 - Fix an off-by-one error in the MAC-address checking code for
4168 DHCPRELEASE that was added in 3.0.1rc5.
4170 - Fix a bug where client-specific information was not being discarded
4171 from the lease when it expired or was released, resulting in
4172 problems if the lease was reallocated to a different client.
4174 - If more than one allocation pool is specified that has the same set
4175 of constraints as another allocation pool on the same shared
4176 network, merge the two pools.
4178 - Don't print an error in fallback_discard, since this just causes
4179 confusion and does not appear to be helping to encourage anyone to
4182 Changes since 3.0.1rc4
4184 - Fix a bug that would cause the DHCP server to spin if asked to parse
4185 a certain kind of incorrect statement.
4187 - Fix a related bug that would prevent an error from being reported in
4190 - Additional documentation.
4192 - Make sure that the hardware address matches the lease when
4193 processing a DHCPRELEASE message.
4195 Changes since 3.0.1rc3
4197 - A minor bug fix in the arguments to a logging function call.
4198 - Documentation update for dhcpd.conf.
4200 Changes since 3.0.1rc2
4202 - Allow the primary to send a POOLREQ message. This isn't what the current
4203 failover draft says to do, so we may have to back it out if I can't get the
4204 authors to relent, but the scheme for balancing that's specified in the
4205 current draft seems needlessly hairy, so I'm floating a trial balloon.
4206 The rc1 code did not implement the method described in the draft either.
4208 Changes since 3.0.1rc1
4210 - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
4211 domain or RRSET. This allows the DHCP server to forget about a name
4212 it added to the DNS once it's been removed, even if the DHCP server
4213 wasn't the one that removed it.
4215 - Install defaults for failover maximum outstanding updates and maximum
4216 silent time. This prevents problems that might occur if these values
4217 were not configured.
4219 - Don't do DDNS deletes if ddns-update-style is none.
4221 - Return relay agent information options in DHCPNAK. This prevents DHCPNAK
4222 messages from being dropped when the relay agent information option contains
4223 routing information.
4225 - Fix a problem where coming up in recover wouldn't result in an update
4228 - Add some more chatty messages when we start a recovery update and when it's
4231 - Fix a possible problem where some state might have been left around
4232 after the peer lost contact and regained contact about how many updates
4235 - Don't nix a lease update because of a lease conflict. This test has
4236 never (as far as I know) prevented a mistake, and it appears to cause
4237 problems with failover.
4239 - Add support in rc history code for keeping a selective history, rather
4240 than a history of all references and dereferences. This code is only used
4241 when extensive additional debugging is enabled.
4245 - Make allocators for hash tables. As a side effect, this fixes a memory
4246 smash in the subclass allocation code.
4248 - Fix a small bug in omshell where if you try to close an object when
4249 no object is open, it dumps core.
4251 - Fix an obscure coredump that could occur on shutdown.
4253 - Fix a bug in the recording of host declaration rubouts in the lease file.
4255 - Fix two potential spins in the host deletion code.
4257 - Fix a core dump that would happen if an application tried to update
4258 a host object attribute with a null value.
4260 Changes since 3.0 Release Candidate 12
4262 - Fix a memory leak in the evaluation code.
4264 - Fix an obscure core dump.
4266 - Print a couple of new warnings when parsing the configuration file
4267 when crucial information is left out.
4269 - Log "no free leases" as an error.
4271 - Documentation updates.
4273 Changes since 3.0 Release Candidate 11
4275 - Always return a subnet selection option if one is sent.
4277 - Fix a warning that was being printed because an automatic data
4278 structure wasn't zeroed.
4280 - Fix some failover state transitions that were being handled
4283 - When supersede_lease is called on a lease whose end time has already
4284 expired, but for which a state transition has not yet been done, do
4285 a state transition. This fixes the case where if the secondary
4286 allocated a lease to a client and the lease "expired" while the
4287 secondary was in partner-down, no expiry event would actually
4288 happen, so the lease would remain active until the primary was
4291 Changes since 3.0 Release Candidate 10
4293 - Fix a bug that was preventing released leases from changing state
4294 in failover-enabled pools.
4296 - Fix a core dump in the client identifier finder code (for host
4299 - Finish fixing a bug where bogus data would sometimes get logged to
4300 the dhclient.leases file because it was opened as descriptor 2.
4302 - Fix the Linux dhclient-script according to suggestions made by
4303 several people on the dhcp-client mailing list.
4305 - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
4307 - Print an error message and refuse to run if a failover peer is
4308 defined but not referenced by any pools.
4310 - Correct a confusing error message in failover.
4312 Changes since 3.0 Release Candidate 9
4314 - Fix a bug in lease allocation for Dynamic BOOTP clients.
4316 Changes since 3.0 Release Candidate 8 Patchlevel 2
4318 - Fix a bug that prevented update-static-leases from working.
4320 - Document failover-state OMAPI object.
4322 - Fix a compilation error on SunOS 4.
4324 Changes since 3.0 Release Candidate 8 Patchlevel 1
4326 - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
4327 This was introduced in rc8pl1 as an unintended result of the memory
4328 leakage fixes that were in pl1.
4330 - Fix a long-standing bug where the server would record that an update
4331 had been done for a client with no name, even though no update had
4332 been done, and then when the client's lease expired the deletion of
4333 that nonexistant record would time out because the name was the null
4336 - Clean up the omshell, dhcpctl and omapi man pages a bit.
4338 Changes since 3.0 Release Candidate 8
4340 - Fix a bug that could cause the DHCP server to spin if
4341 one-lease-per-client was enabled.
4343 - Fix a bug that was causing core dumps on BSD/os in the presence of
4346 - In partner-down state, don't restrict lease lengths to MCLT.
4348 - On the failover secondary, record the MCLT received from the primary
4349 so that if we come up without a connection to the primary we don't
4350 wind up giving out zero-length leases.
4352 - Fix some compilation problems on BSD/os.
4354 - Fix a bunch of memory leaks.
4356 - Fix a couple of bugs in the option printer.
4358 - Fix an obscure error reporting bug in the dns update code, and also
4359 make the message clearer when a key algorithm isn't supported.
4361 - Fix a bug in the tracing code that prevented trace runs that used
4362 tcp connections from being played back.
4364 - Add some additional debugging capability for catching memory leaks
4367 - Make the client release the lease correctly on shutdown.
4369 - Add some configurability to the build system.
4371 - Install omshell manual page in man1, not man8.
4373 - Craig Gwydir sent in a patch that fixes a long-standing bug in the
4374 DHCP client that could cause core dumps, but that for some reason
4375 hadn't been noticed until now.
4377 Changes since 3.0 Release Candidate 7
4379 - Fix a bug in failover where we weren't sending updates after a
4380 transition from communications-interrupted to normal.
4382 - Handle expired/released/reset -> free transition according to the
4383 protocol specification (this works - the other way not only wasn't
4384 conformant, but also didn't work).
4386 - Add a control object in both client and server that allows either
4387 daemon to be shut down cleanly.
4389 - When writing a lease, if we run out of disk space, shut down the
4390 output file and insist on writing a new one before proceeding.
4392 - In the server, if the OMAPI listener port is occupied, keep trying
4393 to get it, rather than simply giving up and exiting.
4395 - Support fetching variables from leases and also updating and adding
4396 variables to leases via OMAPI.
4398 - If two failover peers have wildly different clocks, refuse to start
4401 - Fix a bug in the DNS update code that could cause core dumps when
4402 running on alpha processors.
4404 - Fixed a bug in ddns updates for static lease entries, thanks to a
4405 patch from Andrey M Linkevitch.
4407 - Add support for Darwin/MacOS X
4409 - Install omshell (including new documentation).
4411 - Support DNS updates in the client (this is a very obscure feature
4412 that most DHCP client users probably will not be able to use).
4414 - Somewhat cleaner status logging in the client.
4416 - Make OMAPI key naming syntax compatible with the way keys are
4417 actually named (key names are domain names).
4419 - Fix a bug in the lease file writer.
4421 - Install DHCP ISC headers in a different place than BIND 9 ISC
4422 headers, to avoid causing trouble in BIND 9 builds.
4424 - Don't send updates for attributes on an object when the attributes
4425 haven't changed. Support deleting attributes on remote objects.
4427 - Fix a number of bugs in omshell, and add the unset and refresh
4430 - Handle disconnects in OMAPI a little bit more intelligently (so that
4431 the caller gets ECONNRESET instead of EINVAL).
4433 - Fix a bunch of bugs in the handling of clients that have existing
4434 leases when the try to renew their leases while failover is
4437 Changes since 3.0 Release Candidate 6
4439 - Fix a core dump that could happen when processing a DHCPREQUEST from
4440 a client that had a host declaration that contained both a
4441 fixed-address declaration and a dhcp-client-identifier option
4442 declaration, if the client identifier was longer than nine bytes.
4444 - Fix a memory leak that could happen in certain obscure cases when
4445 using omapi to manipulate leases.
4447 - Fix some bugs and omissions in omshell.
4449 Changes since 3.0 Release Candidate 5
4451 - Fix a bug in omapi_object_dereference that prevented objects in
4452 chains from having their reference counts decreased on dereference.
4454 - Fix a bug in omapi_object_dereference that would prevent object
4455 chains from being freed upon removal of the last reference external
4458 - Fix a number of other memory leaks in the OMAPI protocol subsystem.
4460 - Add code in the OMAPI protocol handler to trace memory leakage.
4462 - Clean up the memory allocation/reference history printer.
4464 - Support input of dotted quads and colon-separated hex lists as
4465 attribute values in omshell.
4467 - Fix a typo in the Linux interface discovery code.
4469 - Conditionalize a piece of trace code that wasn't conditional.
4471 Changes since 3.0 Release Candidate 4
4473 - Fix a bug that would prevent leases from being abandoned properly on
4476 - Fix failover peer OMAPI support.
4478 - In failover, correctly handle expiration of leases. Previously,
4479 leases would never be reclaimed because they couldn't make the
4480 transition from EXPIRED to FREE.
4482 - Fix some broken failover state transitions.
4484 - Documentation fixes.
4486 - Take out an unnecessary check in DHCP relay agent information option
4487 stashing code that was preventing REBINDING clients from rebinding.
4489 - Prevent failover peers from allocating leases in DHCPREQUEST
4490 processing if the lease belongs to the other server.
4492 - Record server version in lease file introductory comment.
4494 - Correctly report connection errors in OMAPI and failover.
4496 - Make authentication signature algorithm name comparisons in OMAPI
4499 - Fix compile problem on SunOS 4.x
4501 - If a signature algorithm is not terminated with '.', terminate it so
4502 that comparisons between fully-qualified names will work
4505 - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
4506 systems with the probe not working correctly.
4508 - Don't allow user to type omapi key on command line of omshell.
4510 Changes since 3.0 Release Candidate 3
4512 - Do lease billing on startup in a way that I *think* will finally do
4513 the billing correctly - the previous method could overbill as a
4514 result of duplicate leases.
4516 - Document OMAPI server objects.
4518 Changes since 3.0 Release Candidate 2 Patchlevel 1
4520 - Fix some problems in the DDNS update code. Thanks to Albert
4521 Herranz for figuring out the main problem.
4523 - Fix some reference counting errors on host entries that were causing
4526 - Fix a byte-swap bug in the token ring code, thanks to Jochen
4529 - Fix a bug in lease billing, thanks to Jonas Bulow.
4531 Changes since 3.0 Release Candidate 2
4533 - Change the conditions under which a DHCPRELEASE is actually
4534 committed to be consistent with lease binding states rather than
4535 using the lease end time. This may fix some problems with the
4538 - Fix a bug where lease updates would fail on Digital Unix (and maybe
4539 others) because malloc was called with a size of zero.
4541 - Fix a core dump that happens when the DHCP server can't create its
4544 Changes since 3.0 Release Candidate 1 Patchlevel 1
4546 - Fix the dhcp_failover_put_message to not attempt to allocate a
4547 zero-length buffer. Some versions of malloc() fail if you try to
4548 allocate a zero-length buffer, and this was causing problems on,
4551 - Fix a case where the failover code was printing an error message
4552 when no error had occurred.
4554 - Fix a problem where when a server went down and back up again, the
4555 peer would not see a state transition and so would stay in the
4556 non-communicating state.
4558 - Be smart about going into recover_wait.
4560 - Fix a problem in the failover implementation where peers would fail
4561 to come into sync if interrupted in the RECOVER state. This could
4562 have been the cause of some problems people have reported recently.
4564 - Fix a problem with billing classes where they would not be unbilled
4565 when the client lease expired.
4567 - If select fails, figure out which descriptor is bad, and cut it out
4568 of the I/O loop. This prevents a potentially nasty spin. I
4569 haven't heard any report it in a while, but it came up consistently
4572 - Fix a bug in the relay agent where if you specified interfaces on
4573 the command line, it would fail.
4575 - Fix a couple of small bugs in the omapi connection object (no known
4578 - Add the missing 3.0 Beta 1 lease conversion script.
4580 - Read dhcp client script hooks if they exist, rather than only if
4583 Changes since 3.0 Release Candidate 1
4585 - Fix a memory smash that happens when fixed-address leases are used.
4586 ANY SITE AT WHICH FIXED-ADDRESS STATEMENTS ARE BEING USED SHOULD
4587 UPGRADE IMMEDIATELY. This has been a long-standing bug - thanks to
4588 Alvise Nobile for discovering it and helping me to find it!
4590 - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
4593 - There is a known problem with the DHCP server doing failover on
4594 Compaq Alpha systems. This patchlevel is not a release candidate
4595 because of this bug. The bug should be straightforward to fix, so
4596 a new release candidate is expected shortly.
4598 - There is a known problem in the DDNS update code that is probably a
4599 bug, and is not, as far as we know, fixed in this patchlevel.
4601 Changes since 3.0 Beta 2 Patchlevel 24
4603 - Went over problematic failover state transitions and made them all
4604 work, so that failover should now much less fragile.
4606 - Add some dhcpctl and omapi documentation
4608 - Fix compile errors when compiling with unusual predefines.
4610 - Make Token Ring work on Linux 2.4
4612 - Fix the Digital Unix BPF_WORDALIGN bug.
4614 - Fix some dhcp client documentation errors.
4616 - Update some parts of the README file.
4618 - Support GCC on SCO.
4620 Changes since 3.0 Beta 2 Patchlevel 23
4622 - Fix a bug in the DNS update code where a status code was not being
4623 checked. This may have been causing core dumps.
4625 - When parsing the lease file, if a lease declaration includes a
4626 billing class statement, and the lease already has a billing class,
4627 unbill the old class.
4629 - When processing failover transactions, where acks will be deferred,
4630 process the state transition immediately.
4632 - Don't try to use the new SIOCGIFCONF buffer size detection code on
4633 Linux 2.0, which doesn't provide this functionality.
4635 - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
4637 - Fix a problem in using the which command in the configure script.
4639 - Fix a parse error in the client when setting up an omapi listener.
4641 - Document the -n and -g flags to the client.
4643 - Make sure there is always a stdin and stdout on startup. This
4644 prevents shell scripts from accidentally writing error messages into
4645 configuration files that happen to be opened as stderr.
4647 - If an interface is removed, the client will now notice that it is
4648 gone rather than spinning. This has only been tested on NetBSD.
4650 - The client will attempt to get an address even if it can't create a
4653 - Don't overwrite tracefiles.
4655 - Fix some memory allocation bugs in failover.
4657 Changes since 3.0 Beta 2 Patchlevel 22
4659 - Apply some patches suggested by Cyrille Lefevre, who is maintaining
4660 the FreeBSD ISC DHCP Distribution port.
4662 - Fix a core dump in DHCPRELEASE.
4664 Changes since 3.0 Beta 2 Patchlevel 21
4666 - This time for sure: fix the spin described in the changes for pl20.
4668 Changes since 3.0 Beta 2 Patchlevel 20
4670 - Fix a problem with Linux detecting large numbers of interfaces (Ben)
4672 - Fix a memory smash in the quotify code, which was introduced in
4675 - Actually fix the spin described in the changes for pl20. The
4676 previous fix only partially fixed the problem - enough to get it
4677 past the regression test.
4679 Changes since 3.0 Beta 2 Patchlevel 19
4681 - Fix a bug that could cause the server to abort if compiled with
4682 POINTER_DEBUG enabled.
4684 - Fix a bug that could cause the server to spin when responding to a
4687 - Apply Joost Mulders' suggested patches for DLPI on x86.
4689 - Support NUL characters in quoted strings.
4691 - Install unformatted man pages on SunOS.
4693 Changes since 3.0 Beta 2 Patchlevel 18
4695 - Allow the server to be placed in partner-down state using OMAPI.
4698 - Implement omshell, which can be used to do arbitrary things to the
4699 server (in theory). (Damien Neil)
4701 - Fix a case where if a client had two different leases the server could
4702 actually dereference the second one when it hadn't been referenced,
4703 leading to memory corruption and a core dump. (James Brister)
4705 - Fix a case where a client could request the address of another client's
4706 lease, but find_lease wouldn't detect that the other client had it, and
4707 would attempt to allocate it to the client, resulting in a lease conflict
4710 - Fix a case where a client with more than one client identifier could be
4711 given a lease where the hardware address was correct but the client
4712 identifier was not, resulting in a lease conflict message.
4714 - Fix a problem where the server could write out a colon-separated
4715 hex list as a value for a variable, which would then not parse.
4716 The fix is to always write strings as quoted strings, with any
4717 non-printable characters quoted as octal escape sequences. So
4718 a file written the old way still won't work, but new files written
4721 - Fix documentation for sending non-standard options.
4723 - Use unparsable names for unknown options. WARNING: this will
4724 break any configuration files that use the option-nnn convention.
4725 If you want to continue to use this convention for some options,
4726 please be sure to write a definition, like this:
4728 option option-nnn code nnn = string;
4730 You can use a descriptive name instead of option-nnn if you like.
4732 - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
4733 DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
4734 result of a deceptively silly bug in supersede_lease.
4736 - Fix client script exit status check, according to a fix supplied by
4739 - Fix an endianness bug in the tracefile support, regarding ICMP
4742 - Fix a bug in the client where the medium would not work correctly if
4743 it contained quoted strings.
4745 ** there was no pl17 **
4747 Changes since 3.0 Beta 2 Patchlevel 16
4749 - Add support for transaction tracing. This allows the state of the
4750 DHCP server on startup, and all the subsequent transactions, to be
4751 recorded in a file which can then be played back to reproduce the
4752 behaviour of the DHCP server. This can be used to quickly
4753 reproduce bugs that cause core dumps or corruption, and also for
4754 tracking down memory leaks.
4756 - Incorporate some bug fixes provided by Joost Mulders for the DLPI
4757 package which should clear up problems people have been seeing on
4760 - Fix bugs in the handling of options stored as linked lists (agent
4761 options, fqdn options and nwip options) that could cause memory
4762 corruption and core dumps.
4764 - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
4765 not being send in some cases when they were needed.
4767 - Make the lease structure somewhat more compact.
4769 - Make initial failover startup *much* faster. This was researched
4770 and implemented by Damien Neil.
4772 - Add a --version flag to all executables, which prints the program
4773 name and version to standard output.
4775 - Don't rewrite the lease file every thousand leases.
4777 - A bug in nit.c for older SunOS machines was fixed by a patch sent in
4778 by Takeshi Hagiwara.
4780 - Fix a memory corruption bug in the DHCP client.
4782 - Lots of documentation updates.
4784 - Add a feature allowing environment variables to be passed to the
4785 DHCP client script on the DHCP client command line.
4787 - Fix client medium support, which had been broken for some time.
4789 - Fix a bug in the DHCP client initial startup backoff interval, which
4790 would cause two DHCPDISCOVERS to be sent back-to-back on startup.
4792 Changes since 3.0 Beta 2 Patchlevel 15
4794 - Some documentation tweaks.
4796 - Maybe fix a problem in the DLPI code.
4798 - Fix some error code space inconsistencies in ddns update code.
4800 - Support relay agents that intercept unicast DHCP messages to stuff
4801 agent options into them.
4803 - Fix a small memory leak in the relay agent option support code.
4805 - Fix a core dump that would occur if a packet was sent with no
4808 Changes since 3.0 Beta 2 Patchlevel 14
4810 - Finish fixing a long-standing bug in the agent options code. This
4811 was causing core dumps and failing to operate correctly - in
4812 particular, agent option stashing wasn't working. Agent option
4813 stashing should now be working, meaning that agent options can be
4814 used in class statements to control address allocation.
4816 - Fix up documentation.
4818 - Fix a couple of small memory leaks that would have added up
4819 significantly in a high-demand situation.
4821 - Add a log-facility configuration parameter.
4823 - Fix a compile error on some older operating systems.
4825 - Add the ability in the client to execute certain statements before
4826 transmitting packets to the server. Handy for debugging; not much
4827 practical use otherwise.
4829 - Don't send faked-out giaddr when renewing or bound - again, useful
4832 Changes since 3.0 Beta 2 Patchlevel 13
4834 - Fixed a problem where the fqdn decoder would sometimes try to store
4835 an option with an (unsigned) negative length, resulting in a core
4836 dump on some systems.
4838 - Work around the Win98 DHCP client, which NUL-terminates the FQDN
4841 - Work around Win98 and Win2k clients that will claim they want to do
4842 the update even when they don't have any way to do it.
4844 - Fix some log messages that can be printed when failover is operating
4845 that were not printing enough information.
4847 - It was possible for a DHCPDISCOVER to get an allocation even when
4848 the state machine said the server shouldn't be responding.
4850 - Don't load balance DHCPREQUESTs from clients in RENEWING and
4851 REBINDING, since in RENEWING, if we heard it, it's for us, and in
4852 REBINDING, the client wouldn't have got to REBINDING if its primary
4855 - When we get a bogus state lease binding state transition, don't do
4859 Changes since 3.0 Beta 2 Patchlevel 12
4861 - Fixed a couple of silly compile errors.
4863 Changes since 3.0 Beta 2 Patchlevel 11
4865 - Albert Herranz tracked down and fixed a subtle bug in the base64
4866 decoder that would prevent any key with an 'x' in its base64
4867 representation from working correctly.
4869 - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
4870 hang that they both spotted in the DHCP server - when
4871 one-lease-per-client was set, the code to release the "other" lease
4874 - Fix a problem with alignment of the input buffer in bpf in cases
4875 where two packets arrive in the same bpf read.
4877 - Fix a problem where the relay agent would crash if you specified an
4878 interface name on the command line.
4880 - Add the ability to conditionalize client behaviour based on the
4883 - Add support for the FQDN option, and added support for a new way of
4884 doing ddns updates (ddns update style interim) that allows more than
4885 one DHCP server to update the DNS for the same network(s). This
4886 was implemented by Damien Neil with some additional functionality
4889 - Damien added a "log" statement, so that the configuration file can
4890 be made to log debugging information and other information.
4892 - Fixed a bug that caused option buffers not to be terminated with an
4895 - Fixed a long-standing bug in the support for option spaces where the
4896 options are stored as an ordered list rather than in a hash table,
4897 which could theoretically result in memory pool corruption.
4899 - Prevent hardware declarations with no actual hardware address from
4900 being written as something unparsable, and behave correctly in the
4901 face of a null hardware address on input.
4903 - Allow key names to be FQDNs, and qualify the algorithm name if it is
4904 specified unqualified.
4906 - Modify the DDNS update code so that it never prints the "resolver
4907 failed" message, but instead says *why* the resolver failed.
4909 - Officially support the subnet selection option, which now has an
4912 - Fix a build bug on MacOS X.
4914 - Allow administrator to disable ping checking.
4916 - Clean up dhcpd.conf documentation and add more information about how
4919 Changes since 3.0 Beta 2 Patchlevel 10
4921 - Fix a bug introduced during debugging (!) and accidentally committed
4924 Changes since 3.0 Beta 2 Patchlevel 9
4926 - Fix DHCP client handling of vendor encapsulated options.
4928 - Fix a bug in the handling of relay agent information options introduced
4931 - Stash agent options on client leases by default, and use the stashed
4932 options at renewal time.
4934 - Add the ability to test the client's binding state in the client
4935 configuration language.
4937 - Fix a core dump in the DNS update code.
4939 - Fix some expression evaluation bugs that were causing updates to be
4940 done when no client hostname was received.
4942 - Fix expression evaluation debugging printfs.
4944 - Teach pretty_print_option to print options in option spaces other than
4945 the DHCP option space.
4947 - Add a warning message if the RHS of a not is not boolean.
4949 - Never select for more than a day, because some implementations of
4950 select will just fail if the timeout is too long (!).
4952 - Fix a case where a DHCPDISCOVER from an unknown network would be
4955 - Fix a bug where if a client requested an IP address for which a different
4956 client had the lease, the DHCP server would reallocate it anyway.
4958 - Fix the DNS update code so that if the client changes its name, the DNS
4959 will be correctly updated.
4961 Changes since 3.0 Beta 2 Patchlevel 8
4963 - Oops, there was another subtle math error in the header-length
4966 Changes since 3.0 Beta 2 Patchlevel 7
4968 - Oops, forgot to byte-swap udp header length before bounds-checking it.
4970 Changes since 3.0 Beta 2 Patchlevel 6
4972 - Fix a possible DoS attack where a client could cause the checksummer
4973 to dump core. This was a read, not a write, so it shouldn't be
4974 possible to exploit it any further than that.
4976 - Implement client- and server-side support for using the Client FQDN
4979 - Support for other option spaces in the client has been added. This
4980 means that it is now possible to define a vendor option space on the
4981 client, request options in that space from the server (which must
4982 define the same option space), and then use those options in the
4983 client. This also allows NWIP and Client FQDN options to be used
4986 - Add object initializer support. This means that objects can now be
4987 initialized to something other than all-zeros when allocated, which
4988 makes, e.g., the interface object support code a little more robust.
4990 - Fix an off-by-one bug in the host stuffer. This was causing host
4991 deletes not the work, and may also have been causing OMAPI
4992 connections to get dropped. Thanks to James Brister for tracking
4995 - Fixed a core dump in the interface discovery code that is triggered
4996 when there is no subnet declaration for an interface, but the server
4997 decides to continue running. Thanks to Shane Kerr for tracking
4998 down and fixing this problem.
5000 Changes since 3.0 Beta 2 Patchlevel 5
5002 - Fix a bug in the recent enhancement to the interface discovery code
5003 to support arbitrary-length interface lists.
5005 - Support NUL-terminated DHCP options when initializing client-script
5008 - Fix suffix operator.
5010 - Fix NetWare/IP option parsing.
5012 - Better error/status checking in dhcpctl initialization and omapi
5015 - Fix a potential memory smash in dhcpctl code.
5017 - Fix SunOS4 and (maybe) Ultrix builds.
5019 - Fix a bug where a certain sort of incoming packet could cause a core
5020 dump on Solaris (and probably elsewhere).
5022 - Add some more safety checks in error logging code.
5024 - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
5026 - Fix relay agent so that if an interface is specified on the command
5027 line, the relay agent does not dump core.
5029 - Fix class matching so that match if can be combined with match or
5032 - Do not allow spurious leases in the lease database to introduce
5033 potentially bogus leases into the in-memory database.
5035 - Fix a byte-order problem in the client hardware address type code
5038 - Be slightly less picky about what sort of hardware addresses OMAPI
5039 can install in host declarations.
5041 Changes since 3.0 Beta 2 Patchlevel 4
5043 - Incorporated Peter Marschall's proposed change to array/record
5044 parsing, which allows things like the slp-agent option to be encoded
5045 correctly. Thanks very much to Peter for taking the initiative to
5046 do this, and for doing such a careful job of it (e.g., updating the
5049 - Added an encoding for the slp-agent option. :')
5051 - Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
5052 request for help on this with patches!
5054 - Incorporated a change that should fix a problem reported by Philippe
5055 Jumelle where when the network connection between two servers is
5056 lost, they never reconnect.
5058 - Fix client script files other than that for NetBSD to actually use
5059 make_resolv_conf as documented in the manual page.
5061 - Fix a bug in the packet handling code that could result in a core
5064 - Fix a bug in the bootp code where responses on the local net would
5065 be sent to the wrong MAC address. Thanks to Jerry Schave for
5068 Changes since 3.0 Beta 2 Patchlevel 3
5070 - In the DHCP client, execute client statements prior to using the values
5071 of options, so that the client configuration can overridden, e.g., the
5074 - Fix a reference counting error that would result in very reproducible
5075 failures in updates, as well as occasional core dumps, if a zone was
5076 declared without a key.
5078 - Fix some Linux 2.0 compilation problems.
5080 - Fix a bug in scope evaluation during execution of "on" statements that
5081 caused values not to be recorded on leases.
5083 - If the dhcp-max-message-size option is specified in scope, and the
5084 client didn't send this option, use the one specified in scope to
5085 determine the maximum size of the response.
5087 Changes since 3.0 Beta 2 Patchlevel 2
5089 - Fix a case where spawning subclasses were being allocated
5090 incorrectly, resulting in a core dump.
5092 - Fix a case where the DHCP server might inappropriately NAK a
5095 - Fix a place dhcprequest() where static leases could leak.
5097 - Include memory.h in omapip_p.h so that we don't get warnings about
5100 Changes since 3.0 Beta 2 Patchlevel 1
5102 - Notice when SIOCFIGCONF returns more data than fit in the buffer -
5103 allocate a larger buffer, and retry. Thanks to Greg Fausak for
5106 - In the server, if no interfaces were configured, report an error and
5109 - Don't ever record a state of 'startup'.
5111 - Don't try to evaluate the local failover binding address if none was
5112 specified. Thanks to Joseph Breu for finding this.
projects / thirdparty / dhcp.git / blob