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Internet Systems Consortium DHCP Distribution
Version 4.4.2b1
18 December 2019
Release Notes
NEW FEATURES
Please note that that ISC DHCP is now licensed under the Mozilla Public License,
MPL 2.0. Please see https://www.mozilla.org/en-US/MPL/2.0/ to read the MPL 2.0
license terms.
While release 4.4.2b1 is primarily a maintenance release that addresses a number
of defects, it does introduce a few new features:
- Keama - Keama is a migration utility that assists in converting ISC DHCP
server configuration files to Kea configuration files. It is found in the
keama subdirectory and includes a README.md file with instructions on how
to build it as well as a manpage on its usage.
- Two new server parameters related to ping checking were added:
1. ping-cltt-secs which allows the user to specify the number of seconds
that must elapse since CLTT before a ping check is conducted.
2. ping-timeout-ms which allows the user to specify the amount of time the
server waits for a ping-check response in milliseconds rather than in
seconds.
In general, the areas of focus for ISC DHCP 4.4 were:
1. Dynamic DNS additions
2. dhclient improvements
3. Support for dynamic shared libraries
Dynamic DNS Improvements:
- We added three new server configuration parameters which influence DDNS
conflict resolution:
1. ddns-dual-stack-mixed-mode - alters DNS conflict resolution behavior
to mitigate issues with non-compliant clients in dual stack environments.
2. ddns-guard-id-must-match - relaxes the DHCID RR client id matching
requirement of DNS conflict resolution.
3. ddns-other-guard-is-dynamic - alters dual-stack-mixed-mode behavior to
allow unguarded DNS entries to be overwritten in certain cases
- The server now honors update-static-leases parameter for static DHCPv6
hosts.
dhclient Improvements:
- We've added three command line parameters to dhclient:
1. --prefix-len-hint - directs dhclient to use the given length as
the prefix length hint when requesting prefixes
2. --decline-wait-time - instructs the client to wait the given number
of seconds after declining an IPv4 address before issuing a discover
3. --address-prefix-len - specifies the prefix length passed by dhclient
into the client script (via the environment variable ip6_prefixlen) with
each IPv6 address. We added this parameter because we have changed the
default value from 64 to 128 in order to be compliant with RFC3315bis
draft (-09, page 64) and RFC5942, Section 4, point 1.
**WARNING**: The new default value of 128 may not be backwardly compatible
with your environment. If you are operating without a router, such as
between VMs on a host, you may find they cannot see each other with prefix
length of 128. In such cases, you'll need to either provide routing or use
the command line parameter to set the value to 64. Alternatively you may
change the default at compile time by setting DHCLIENT_DEFAULT_PREFIX_LEN
in includes/site.h.
- dhclient will now generate a DHCPv6 DECLINE message when the client script
indicates a DAD failure
Dynamic shared library support:
Configure script, configure.ac+lt, which supports libtool is now provided
with the source tar ball. This script can be used to configure ISC DHCP
to build with libtool and thus use dynamic shared libraries.
Other Highlights:
- The server now supports dhcp-cache-threshold for DHCPv6 operations
- The server now supports DHPv6 address allocation based on EUI-64 DUIDs
- Experimental support for alternate relay port in the both the server
and relay for IPv4, IPv6 and 4o6 (see: draft-ietf-dhc-relay-port-10.txt)
For information on how to install, configure and run this software, as
well as how to find documentation and report bugs, please consult the
README file.
ISC DHCP uses standard GNU configure for installation. Please review the
output of "./configure --help" to see what options are available.
The system has only been tested on Linux, FreeBSD, and Solaris, and may not
work on other platforms. Please report any problems and suggested fixes to
<dhcp-users@isc.org>.
ISC DHCP is open source software maintained by Internet Systems
Consortium. This product includes cryptographic software written
by Eric Young (eay@cryptsoft.com).
Changes since 4.4.2b1 (Bug Fixes)
- Added a clarification on DHCPINFORMs and server authority to
dhcpd.conf.5
[Gitlab #37]
- Only emit lease scrubbing log messages when DEBUG_FAILOVER_MESSAGES
is defined.
[Gitlab #72]
- Added the interface name to socket initialization failure log messages.
Prior to this the log messages stated only the error reason without
stating the target interface.
[Gitlab #75]
- Corrected buffer pointer logic in dhcrelay functions that manipulate
agent relay options. Thanks to Thomas Imbert of MSRC Vulnerabilities
& Mitigations for reporting the issue.
[#71]
Changes since 4.4.1 (New Features)
- A new configuration parameter, ping-cltt-secs (v4 operation only), has
been added to allow the user to specify the number of seconds that must
elapse since CLTT before a ping check is conducted. Prior to this, the
value was hard coded at 60 seconds. Please see the server man pages for
a more detailed discussion.
[ISC-Bugs #36283]
- A new configuration parameter, ping-timeout-ms (v4 operation only),
has been added that allows the user to specify the amount of time
the server waits for a ping-check response in milliseconds rather
than in seconds (via ping-timeout). When greater than zero, the value
of ping-timeout-ms will override the value of ping-timeout. Thanks
to Jay Doran from Bluecat Networks for suggesting this feature.
[Gitlab #10]
- An experimental tool called, Keama (KEA Migration Assistant), which helps
translate ISC DHCP configurations to Kea configurations, is now included
in the distribution.
[Gitlab #34]
Changes since 4.4.1 (Bug Fixes)
- Corrected a misuse of the BIND9 DDNS API which caused DDNS updates to be
carried out over TCP rather than UDP. The coding error was exposed by
migration to BIND9 9.11. Thanks to Jinmei Tatuya at Infoblox for
reporting the issue.
[ISC-Bugs #47757]
- Bind9 now defaults to requiring python to build. The Makefile for
building Bind9 when bundled with ISC DHCP was modified to turn off
this dependency.
[Gitlab #3]
- Corrected a dual-stack mixed-mode issue that occurs when both
ddns-guard-id-must-match and ddns-other-guard-is-dynamic
are enabled and that caused the server to incorrectly interpret
the presence of a guard record belonging to another client as
a case of no guard record at all. Thanks to Fernando Soto
from BlueCat Networks for reporting this issue.
[Gitlab #1]
- Corrected a compilation issue that occurred when building without DNS
update ability (e.g. by undefining NSUPDATE).
[Gitlab #16]
- Corrected an issue that was causing the server, when running in
DHPCv4 mode, to segfault when class lease limits are reached.
Thanks to Peter Nagy at Porion-Digital for reporting the matter
and submitting a patch.
[Gitlab #13]
- Made minor changes to eliminate warnings when compiled with GCC 9.
Thanks to Brett Neumeier for bringing the matter to our attention.
[Gitlab #15]
- Fixed potential memory leaks in parser error message generation
spotted by Coverity, CIDs: 1448191, 1448193, 1448194, 1448195
[Gitlab #30]
- Updated URL of IEEE oui.txt in contrib/dhcp-lease-list.pl. Thanks
to Tommy Smith for contributing the patch.
[Gitlab #26]
- Fixed define flags when using SO_BINDTODEVICE. Thanks to Joe LeVeque for
reporting the issue.
[GitLab #19]
- Applied a patch from OpenBSD to always set the scope id of outbound
DHPCv6 packets. Note this change only applies when compiling under
OpenBSD. Thanks to Brad Smith at OpenBSD from bringing it to our
attention.
[Gitlab #33]
- Modified dhclient to not discard config file leases that are
duplicates of server-provided leases and to retain such leases
after they have been used as the fallback active lease and
DHCP service has been restored. This allows them to be used
more than once during the lifetime of a dhclient instance.
This applies to DHCPv4 operation only.
[Gitlab #9]
- Corrected a number of reference counter and zero-length buffer leaks.
Thanks to Christopher Ertl of MSRC Vulnerabilities & Mitigations for
pointing them out.
[Gitlab #57]
- Closed a small window of time between the installation of graceful
shutdown signal handlers and application context startup, during which
the receipt of shutdown signal would cause a REQUIRE() assertion to
occur. Note this issue is only visible when compiling with
ENABLE_GENTLE_SHUTDOWN defined.
[Gitlab #53]
- Corrected a buffer overflow that can occur when retrieving zone
names that are more than 255 characters in length.
[Gitlab #20]
- The "d" domain name option format was incorrectly handled as text
instead of RFC 1035 wire format. Thanks to Jay Doran at BlueCat Networks
for reporting this issue.
[Gitlab #2]
- Improved the error message issued when a host declaration has both
a uid and a dhcp-client-identifier. Server configuration parsing will
now fail if a host declaration specifies more than one uid.
[Gitlab #7]
- Updated developer's documentation on building and running unit tests.
Removed support for --with-atf=bind as BIND9 no longer bundles in ATF
source.
[Gitlab #35]
- Fixed a syntax error in ldap.c which cropped up under Ubuntu
18.04.1/gcc 7.4.0. Thanks to Charles Hedrick for pointing it out.
[Gitlab #51]
- Added clarification to dhcp-options.5 section on ip-address values
describing the first-use DNS resolution of options with hostnames as
values (e.g. next-server).
[Gitlab #28]
- The option format for the server option omapi-key was changed to a
format type 'k' (key name); while server options ldap-port and
ldap-init-retry were changed to 'L' (unsigned 32-bit integer). These
three options were inadvertantly broken when the 'd' format content
was changed to comply with RFC 1035 wire format (see Gitlab #2).
[Gitlab #68]
Changes since 4.4.0 (New Features)
- none
Changes since 4.4.0 (Bug Fixes)
- A delayed-ack value of 0 (the default), now correctly disables the delayed
feature. A change in 4.4.0 prohibited lease updates marking leases active
from be written to the lease file when delayed-ack is 0. This in turn,
caused servers to lose active lease assignments upon restart.
[ISC-Bugs #47141]
! Option reference count was not correctly decremented in error path
when parsing buffer for options. Reported by Felix Wilhelm, Google
Security Team.
[ISC-Bugs #47140]
CVE: CVE-2018-5733
! Corrected an issue where large sized 'X/x' format options were causing
option handling logic to overwrite memory when expanding them to human
readable form. Reported by Felix Wilhelm, Google Security Team.
[ISC-Bugs #47139]
CVE: CVE-2018-5732
- Added use of new Bind9 compatibility header files, that are now necessary
to supply type definitions for primitive data types, removed from Bind9
proper. Altered util/bind.sh to pull from Bind9 repo on gitlab.
[ISC-Bugs #48072]
[ISC-Bugs #48071]
Changes since 4.4.0b1 (New Features)
- Duplicate address detection when binding to a new IPv6 address was added
to the following dhclient scripts: linux,freebsd,netbsd,openbsd, and macos.
The scripts will check for DAD errors after binding to a new IPv6 address
for at most --dad-wait-time seconds. If a DAD error is detected the script
will exit with a value of 3, instructing dhclient to decline the address. If
dad-wait-time is zero (the default), DAD error checking is not peformed.
[ISC-Bugs 46805]
- Support for sending and receiving additional DHCP4 options has been added
to both the dhcpd and dhclient. Specifically: option codes 93,94, and 97
(RFC 4578); code 150 (RFC 5859); and codes 209,219, and 211 (RFC 5071).
Beyond configuring, sending, requesting, and receiving these options neither
server nor client apply any additional logic based on their values.
Thanks to Peter Lewis for requesting this change.
[ISC-Bugs 47062]
Changes since 4.4.0b1 (Bug Fixes)
- Added clarifying text to dhcpd.conf.5 explaining the class match expressions
cannot rely on the results of executable statements.
[ISC-Bugs #45451]
- Fixed a bug which causes dhcpd and dhclient to crash on certain
systems when given relative path names for lease or pid files on
the command line. Affected systems are those on which the C library
function, realpath() does not support a second parameter value of
NULL (see manpages for realpath(3)).
[ISC-Bugs #46957]
- Fixed a build issue when building with embedded BIND9 under OpenBSD that
was causing BIND9 build to not generate dns/enumclass.h and dns/enumtype.h.
[ISC-Bugs #46971]
- Added <dhcp>/m4/README to the distribution tarball. Some versions of
ac_local() treat the absence of the m4 subdirectory as error rather than
warning. This was causing the call to autoreconf, necessary for building
with libtool, to fail.
[ISC-Bugs #47075]
Changes since 4.4.0a1 (New Features)
- Added experimental support for relay port (draft-ietf-dhc-relay-port-10.txt)
feature for DHCPv4, DHCPv6 and DHCPv4-over-DHCPv6. Relay port has to be
enabled at compile time via --enable-relay-port and is fully backward
compatible (i.e. works with previous implementations of servers and relays
using the standard ports). A new --rp <relay-port> command line option
specifies to dhcrelay an alternate source port for upstream (i.e. toward
the server) messages. Thanks to Naiming Shen and Enke Chen of Cisco
systems for submitting these patches.
[ISC-Bugs #44535]
- Added --release-on-roam to dhcpd server. When enabled and the server detects
that a DHCPv6 client (IAID+DUID) has roamed to a new network, it will release
the pre-existing leases on the old network and emit a log statement similar
to the following:
"Client: <id> roamed to new network, releasing lease: <address>"
The server will carry out all of the same steps that would normally occur
when a client explicitly releases a lease. This behavior is disabled by
default and may only be specified globally. Prior to this the server renders
the leases unavailable until they expire or the server is restarted. Clients
that need leases in multiple networks must supply a unique IAID in each IA.
When release-on-roam is disabled (the default) the server maintains the
prior behavior of making such leases unavailable until they expire or the
server is restarted. Clients that need leases in multiple networks must
supply a unique IAID in each IA. This parameter may only be specified at
the global level. Thanks to Fernando Soto from BlueCat Networks for
suggesting this change.
[ISC-Bugs #44576]
[ISC-Bugs #46849]
- Support for delayed-ack is now compiled in by default. Prior to this
it had to be enabled at compile time via --enable-delayed-acks. The
default value for delayed-ack, however, has been changed from 28 to 0
(i.e. disabled). This was done to minimize the impact on users not
currently using the feature. Please note that the delayed-ack feature
is not currently compatible with support for DHPCv4-over-DHCPv6 so
when a 4to6 port command line argument enables this in the server the
delayed-ack value is reset to 0.
[ISC-Bugs #42446]
- The server (-6) now honors the parameter, update-static-leases, for static
(fixed-address6) DHCPv6 leases. It is worth noting that because stateful
data is not retained by the server for static leases, each time a client
requests or renews a static lease, the server will perform DDNS updates for
it. This may have significant performance implications for environments
with many clients that request or renew static leases often. Similarly,
the DNS entries will not be removed by server when a client issues a RELEASE
nor if the lease is deleted from the configuration. In such cases the DNS
entries must be removed manually. This feature is disabled by default.
Thanks to both Bill Shirley and dgutier-at-cern-dot-ch for requesting
this change.
[ISC-Bugs #34097]
[ISC-Bugs #41054]
[ISC-Bugs #41450]
- Added to the server (-6) a new statement, local-address6, which specifies
the source address of packets sent by the server. An additional flag,
bind-local-address6, disabled by default, binds the service socket to
to local-address6. Note that bind-local-address does not work with direct
clients: a relay has to forward packets to the server using the
local-address6 destination.
[ISC-Bugs #46084]
Changes since 4.4.0a1 (Bugs)
- The server now recognizes environment variables PATH_DHCPD_DB and
PATH_DHCPD_PID. These had been incorrectly compiled out of the code
unless DHCPv6 support was disabled. Additionally, the server man
pages were corrected to accurately reflect how the server chooses
file names (see lease-file-name and pid-file-name statements). Thanks
to Fernando Soto at Bluecat Networks for bringing this matter to our
attention.
[ISC-Bugs #46859]
- Removed an "Impossible condition" error upon exit in the dhcpd server that
has been shutdown via OMAPI. This condition was only apparent under Solaris
when building with --enable-use-sockets and --enable-ipv4-pktinfo.
[ISC-Bugs #36118]
- Corrected some minor Coverity issues: CID 1426059, 1426058, and 1426057.
[ISC-Bugs #46836]
- Added missing text to dhclient.8 and expanded release note coverage
for --address-prefix-len changes.
Changes since 4.3.6 (New Features)
- Added --enable-bind-install to install embedded bind includes and
libraries. Default is to not install them (it was the previous
behavior). If you'd like to change the includedir and/or libdir
installation directories to something different than for ISC DHCP
you must pass them using the --with-bind-extra-config configuration
arguments.
[ISC-Bugs #39318]
- Added support of dynamic shared libraries with libtool. A new
--enable-libtool configuration parameter is available but
should not be used directly: *please* read the build configuration
section in the README file for the recommended procedure.
[ISC-Bugs #29402]
- IPv6 operation now supports an EUI-64 based address allocation which will
calculate addresses for clients with EUI-64 DUIDs based on those DUIDs when
enabled by setting use-eui-64 true. The parameter may defined down to the
pool scope. Note this feature must be compiled in by defining EUI_64 in
includes/site.h. This flag is undefined by default.
[ISC-Bugs #43927]
- The directory includes/isc-dhcp and it's only occupant, dst.h, have
been removed from the source tree. They are obsolete for branches
other than v4_1_esv.
[ISC-bugs #45541]
- Replaced ISC licensing with Mozilla Public License, MPL 2.0 licensing
throughout. Please see https://www.mozilla.org/en-US/MPL/2.0/ to read
the MPL 2.0 license terms.
[ISC-Bugs #45541]
- Load balancing for failover peers can now be disabled by setting
"load balance max secs" to 0. Doing so for both peers means both
servers will respond to all DHCPDISCOVERs or DHCPREQUESTs as soon as
they are received.
[ISC-Bugs #39669]
- Added a new dhclient command line parameter, --prefix-len-hint <length>.
When used in conjunction with -P, it directs dhclient to use the given
length as the prefix length hint when requesting prefixes. Thanks to both
Indy, of the FireballISO open source project and H. Peter Anvin for
suggesting this change.
[ISC-Bugs #43792]
[ISC-Bugs #35112]
[ISC-Bugs #32228]
[ISC-Bugs #29470]
- dhclient will now wait for 10 seconds after declining an IPv4 address
before issuing a discover. This is in keeping with RFC 2131, section 3.1.5.
Prior to this dhclient did not wait at all. The amount of time dhclient
waits can be specified via a new command line parameter:
--decline-wait-time <seconds>. A value of zero equates to no wait at all.
Thanks to Pavel Kankovsky for bringing this matter to our attention.
**NOTE: THIS IS CHANGE IN DEFAULT BEHAVIOR.
[ISC-Bugs #45457]
- dhclient will now include the lease address when logging DHCPOFFERs,
DHCPREQUESTs, DHCPACKs, DHCPRELEASEs, and DHCPDECLINEs. Additionally,
DHCPOFFERs will be logged before their corresponding DHCPREQUESTs are
sent and logged.
[ISC-Bugs #2729]
- When given the -T command line argument, in addition to reading the
current lease file, the server will write the leases to a temporary
lease file. This can help detect issues in server configuration that
only surface when leases are written to the file. The current lease
file will not be modified and the temporary lease file is removed upon
completion of the test.
[ISC-Bugs #22267]
- dhclient will now generate a DHCPv6 DECLINE message containing all IA_NA
addresses which for which the client script indicates a DAD failure. After
receiving the DECLINE reply, dhclient will restart the solicit process.
Note, the client script must exit with a value of 3 to signify that the
address failed DAD. Thanks to Jiri Popelka of Red Hat for submitting the
patch that was the foundation for this change.
**NOTE: THIS IS CHANGE IN DEFAULT BEHAVIOR.
[ISC-Bugs #21237]
[ISC-Bugs #23357]
[ISC-Bugs #36966]
- Replaced compilation option, enable-secs-byteorder, with a run-time, server
configuration parameter, check-secs-byte-order. When enabled, the
server will check for clients that do the byte ordering on the secs field
incorrectly. This field should be in network byte order but some clients
get it wrong. When this parameter is enabled the server will examine the
secs field and if it looks wrong (high byte non zero and low byte zero) swap
the bytes. The default is disabled. This parameter is only useful when
doing load balancing within failover.
[ISC-Bugs #45364]
- The default value for server (-6) parameter, prefix-length-mode, has been
changed from "exact" to "prefer". In "prefer" mode the server will offer
the first available prefix with the same length as that requested by the
client. If none are found then it will offer the first available prefix of
any length. This is more in line with with RFC 8168 and should improve
the out-of-the-box user experience.
**NOTE: THIS IS CHANGE IN DEFAULT BEHAVIOR.
[ISC-Bugs #45615]
- Added support for 'dhcp-cache-threshold' to IPv6 operation: If a client
renews before 'dhcp-cache-threshold' percent of its lease has elapsed
(default 25%), the server will reuse the allocated lease (provide a
lease within the currently allocated lease-time) rather than extend or
renew the lease. This allows the server to reply without needlessly
writing leases to disk. The preferred and valid lease lifetimes
sent to the client will be reduced by the age of the lease. The option
may be specified down to the pool level and is supported for all three
pool types: NA, TA, and PD.
[ISC-Bugs #45292]
- Added three new server configuration parameters which influence DDNS:
1. ddns-dual-stack-mixed-mode - alters DNS conflict resolution behavior
to mitigate issues with non-compliant clients in dual stack environments.
2. ddns-guard-id-must-match - relaxes the DHCID RR client id matching
requirement of DNS conflict resolution.
3. ddns-other-guard-is-dynamic - alters dual-stack-mixed-mode behavior to
allow unguarded DNS entries to be overwritten in certain cases
[ISC-Bugs #42620]
[ISC-Bugs #42621]
[ISC-Bugs #44753]
- A "key-algorithm <algorithm>" statement has been added to omshell to
allow the specification of the key algorithm to use during transaction
authentication. Prior to this it was hard-coded to be hmac-md5. It now
supports all of the same algorithms as the dhcpd server: hmac-md5 (the
default), hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384, and hmac-sha512.
[ISC-Bugs #46771]
- Added a server configuration parameter, persist-eui-64-leases, which
determines whether or not EUI-64 based leases are written to the
leases file. Default is true.
[ISC-Bugs #45046]
- Changed the default value of the prefix length passed by dhclient into the
client script for each IPv6 address from 64 to 128. This was done to comply
with RFC3315bis draft (-09, page 64) and RFC5942, Section 4, point 1.
In addition, dhclient now supports a command line argument,
--address-prefix-len, which may be used to override the default value.
**WARNING**: This change may not be backwardly compatible with your
environment. If you are operating without a router, such as between VMs on
a host, you may find they cannot see each with prefix length of 128. In
such cases, you'll need to either provide routing or use the command line
parameter to set the value to 64. Alternatively you may change the default
at compile time by setting DHCLIENT_DEFAULT_PREFIX_LEN in includes/site.h.
[ISC-Bugs #23252]
[ISC-Bugs #37221]
- Modified dhclient (-6) to bypass sending a confirm (INIT REBOOT) when it has
only expired address associations. Thanks to Jiri Popelka at Red Hat for
raising the issue and submitting the patch.
[ISC-Bugs #22675]
Changes since 4.3.6 (Bugs):
- Corrected an issue where the server would return a client's previously
released prefix lease even when the client provides a prefix length
hint that does not match the prior lease. Now the server will only
return the previous lease if it exactly matches the hint. If not
it will attempt to allocate a new prefix based on the hint and the
prefix-length-mode. Thanks to Tim DeNike - Lightspeed Communications
for pointing out the error of our ways.
[ISC-bugs #45780]
- Added explicit include of BIND9 isc/util.h to adapt to revisions
in BIND9 (see BIND9 ticket #46311). Prior to this the build was failing
with implicit function declarations errors for POST() and INSIST().
[ISC-bugs #46332]
- Added to code ignore empty IPv4 host name option (code 12). While RFC 2132
states the option cannot be empty, some clients are apparently capable of
sending it. Prior to this the server was attempting to use it and store it
in the lease file causing issues with DDNS and so forth.
[ISC-bugs #43786]
- Corrected dhclient command line parsing for --dad-wait-time that causes
even valid values to fail as invalid on some environments.
[ISC-Bugs #46535]
- Replaced iasubopt::heap_index with separate values for active and inactive
heaps: iasubopt::active_index and iasubopt::inactive_index. This was done
to accommodate a change in behavior in BIND9 isc_heap_delete().
[ISC-bugs #46719]
! Plugged a socket descriptor leak in OMAPI, that can occur when there is
data pending to be written to an OMAPI connection, when the connection
is closed by the reader. Thanks to Pavel Zhukov at RedHat for bringing
this issue to our attention and whose patch helped guide us in the right
direction.
[ISC-Bugs #46767]
- The ability of the server to send back dhcp6.vendor-opts values has been
restored. A change in 4.3.5 (see #29246) which enabled it to send back the
FQDN option unfortunately broke its ability send back dhcp6.vendor-opts.
Thanks to Sumant Gupta (sumantgupta at gmail dot com) of Landis+Gry for
bringing this issue to our attention.
[ISC-Bugs #46427]
Changes since 4.3.6b1
- None
Changes since 4.3.5
- The server now allows the client identifier (option 61) to own leases
in more than one subnet concurrently. Prior to this the server would
incorrectly release an existing lease in one subnet prior to assigning
a lease in another subnet. Note that the prior behavior can be still
be achieved by enabling one-lease-per-client. Thanks to both David Zych at
the University of Illinois and Norm Proffitt of Infoblox for reporting
the issue; and Norm for suggesting a solution.
[ISC-Bugs #41358]
- When replying to a DHCPINFORM, the server will now include options specified
at the pool scope, provided the ciaddr field of the DHCPINFORM is populated.
Prior to this the server only evaluated options down to the subnet scope.
Thanks to Fernando Soto at BlueCat Networks for reporting the issue.
[ISC-Bugs #43219]
[ISC-Bugs #45051]
- When memory allocation fails in a repeated way the process writes
"Run out of memory." on the standard error and exists with status 1.
[ISC-Bugs #32744]
- The new lmdb (Lightning Memory DataBase) bind9 configure option is
now disabled by default to avoid the presence of this library to be
detected which can lead to a link failure.
[ISC-Bugs #45069]
- The linux interface discovery code has been modified to use getifaddrs()
as is done for BSD and OS-X. Prior to this the code would only recognize
the first address on an interface and thereby omit vlans.
Thanks to Jiri Popelka at Redhat, Marius Tomaschewski at SUSE, and Wei
Kong at Novell, who all submitted patches.
[ISC-Bugs #28761]
[ISC-Bugs #31992]
[ISC-Bugs #25428]
[ISC-Bugs #31940]
[ISC-Bugs #32935]
- Fixed a bug in OMAPI that causes omshell to crash when a name-value
pair with a zero length value is shipped in an object. Thanks to
Fernando Soto at BlueCat Networks for reporting the issue and
supplying the patch.
[ISC-Bugs #29108]
- On 64-bit platforms, dhclient now generates the correct value for the
script environment variable, "expiry", the lease expiry value exceeds
0x7FFFFFFF. Prior to this such values would produce negative values
for expiry in the script environment.
[ISC-Bugs #43326]
- Common timer logic was modified to cap the maximum timeout values at
0x7FFFFFFF - 1. Values larger than that were causing fatal timer out of
range errors on 64-bit platforms. Thanks to Jiri Popelka at Red Hat for
reporting the issue.
[ISC-Bugs #28038]
- DHCP6 FQDN option unpacking code now correctly handles values that contain
spaces, special, or non-printable characters. Prior to this the buffer
size needed was underestimated causing a conversion error message to
be logged and DNS updates to be skipped. Thanks to Fernando Soto at
BlueCat Networks for bringing the matter to our attention.
[ISC-Bugs #43592]
- When running in -6 mode, dhclient can enforce the require option statement
and will discard offered leases that do not contain all the required
options specified in the client configuration. If not enabled the client
will still consider such leases. This must be enabled at compile time
(see ENFORCE_DHCPV6_CLIENT_REQUIRE in includes/site.h). Thanks to
Mritunjaykumar Dubey at Nokia for reporting the issue.
[ISC-Bugs #41473]
- Altered DHCPv4 lease time calculation to avoid roll over errors on 64-bit
OS systems when using -1 or large values for default-lease-time. Rollover
values will be replaced with 0x7FFFFFFF - 1. This alleviates unintentionally
short expiration times being handed out when infinite lease times (-1) in
conjunction with failover. Our thanks to Alessandro Gherardi for bringing
the issue to our attention.
[ISC-Bugs #41976]
- Added new compile time option --with-srv-conf-file which specifies a
default location of the server configuration file.
[ISC-Bugs #44765]
- Added --dad-wait-time parameter to dhclient. It specifies the maximum time,
in seconds, that the client process should wait for the duplicate address
detection to complete before initiating DHCP requests. This value is
propagated to the dhclient script and the script is responsible for waiting
the specified amount of time or until DAD has completed. If the script does
not support it, specifying this parameter has no effect. The default value
is 0 which specifies that the script should not wait for DAD. With this
change the following scripts have been modified to support the new parameter:
freebsd, linux, macos, netbsd, openbsd.
[ISC-Bugs #36169]
- The server nows checks both the address and length of a prefix delegation
when attempting to match it to a prefix pool. This ensures the server
responds properly when pool configurations change such that once valid,
"in-pool" delegations are now treated as being invalid. During lease
file loading at startup, the server will discard any PD leases that
are deemed "out-of-pool" either by address or mis-matched prefix length.
Clients seeking to renew or rebind such leases will get a response of
No Binding in the case of the former, and the prefix delegation with
lifetimes set to zero in the case of the latter. Thanks to Mark Nejedlo
at TDS Telecom for reporting this issue.
[ISC-Bugs #35378]
- Modified DDNS support initialization such that DNS related ports will only be
opened by the server (dhcpd) at startup if ddns-update-style is not "none";
by dhclient only if and when the it first attempts an update; and never by
dhcrelay. Prior to this all three always did the initialization at startup
which causes them to always open on and listen for traffic on two random
ports. Thanks to Rodney Beede for reporting this issue.
[ISC-Bugs #45290]
[ISC-Bugs #33377]
- Added error logging to two memory allocation failure checks. Thanks to Bill
Parker (wp02855 at gmail dot com) for reporting the issue.
[ISC-Bugs #41185]
- Corrected a dhclient -6 issue that caused the client to crash with an
"Impossible condition" error after de-preferencing its only IA binding.
The crash occurred when server configuration changes rendered the existing
binding out-of-range and no other leases were available to offer. Thanks
to Pierre Clerissi for bringing this issue to our attention.
[ISC-Bugs #44373]
- By defining CALL_SCRIPT_ON_ONETRY_FAIL in includes/site.h, dhclient will
now call the script with reason set to FAIL when run with -1 (one try) and
there are no server responses. This applies to IPv4 mode only. Thanks for a
patch by Martin Pitt which got to us via Andrew Pollock.
[ISC-bugs #18183]
- The server now detects failover peers that are not referenced in at least
one pool when run with the command line option for test mode, -T. Prior to
this the check was performed too far down stream to be detected in test mode.
[ISC-Bugs #29892]
- Linux script updated. The script is now based on Debian version. It uses
ip tool from iproute2 package and ifconfig is no longer used. This also
addresses an issue of calling arping with inappropriate parameter.
[ISC-bugs #19430]
[ISC-bugs #18111]
- Changed severity of the log message indicating UDP checksum errors in
the received packets from 'info' to 'debug' to avoid logging excessive
number of false positives when UDP checksum offloading is enabled.
[ISC-bugs #41757]
- The directory minires has been removed from the source tree. It has
long been obsolete for branches other than v4_1_esv. Additionally,
includes/minires.h was renamed includes/ns_name.h.
[ISC-bugs #45471]
- Replaced ifconfig parameters "add" and "delete" with "alias" and "-alias"
for IPv6 mode in the client scripts, netbsd and openbsd. This was
preventing IPv6 addresses from being added or removed from interfaces.
Thanks to Tim Dean for reporting this issue.
[ISC-bugs #31573]
Changes since 4.3.5b1
- Corrected a bug which could cause the server to sporadically crash while
loading lease files with the lease-id-format is set to "hex". Our thanks
to Jay Ford, University of Iowa for reporting the issue.
[ISC-Bugs #43185]
- Eliminated a noisy, but otherwise harmless debug log statment that may
appear during server startup when building with --enable-binary-leases
and configuring multiple pools in a shared network. Thanks to Fernando
Soto from BlueCat Networks for reporting the issue and supplying a patch.
[ISC-Bugs #43262]
Changes since 4.3.4
- Fixed util/bindvar.sh error handling.
[ISC-Bugs #41973]
- Correct error message in relay to use remote id length instead
of circuit id length.
[ISC-Bugs #42556]
- Add logic to test directory Makefiles to avoid copying Attfile(s)
when building within the source tree. This eliminates a noisy but
otherwise harmless error message when running "make check".
[ISC-Bugs #41883]
- Leases are now scrubbed of certain prior use information when pool
re-balancing reassigns them from one FO peer to the other. This
corrects an issue where leases that were offered but not used
by the client retained the client hostname from the original
client. Thanks to Pavel Polacek, Jan Evangelista Purkyne University
for reporting the issue.
[ISC-Bugs #42008]
- In the LDAP code and schema add some missing '6' characters to use
the v6 instead of the v4 versions. Thanks to Denis Taranushin for
reporting this issue and supplying its patch.
[ISC-Bugs #42666]
- Correct how the pick-first-value expression is written to a lease
file. Previously it was written as a concat expression due to
a cut and paste error.
[ISC-Bugs #42253]
- Modify the DDNS code to clean up the PTR record even if there
are issues while cleaning up the A or AAAA records.
[ISC-Bugs #23954]
- Added global configuration parameter, abandon-lease-time, which determines
the amount of time a lease remains abandoned. The default is 84600 seconds.
Additionaly, the server now conducts a ping check (if ping checks are
enabled) prior to offering an abandoned lease to client. Our thanks to
David Zych at University of Illinois for reporting the issue and working
with us to produce a viable solution.
[ISC-Bugs #41815]
- Correct handling of interface names during interface discovery. This
addresses an issue where interface names of 15 characters in length
could lead to crashes or interface recognition errors during startup
of dhcpd, dhclient, and dhcrelay.
[ISC-Bugs #42226]
- Updates to contrib/dhcp-lease-list.pl to make it more friendly.
The updates are: looking for the lease file in more places and skipping
the "processing complete" output when creating machine readable
output. Thanks to Cameron Paine (cbp at null dot net) for the
patch.
[ISC-Bugs #42113]
- When reusing a lease for dhcp-cache-threshold return the hostname
to the original lease. Also if the host pointer, UID or hardware address
change don't allow reuse of the lease.
Thanks to Michael Vincent for reporting this and helping us
verify the problem and fix.
[ISC-Bugs #42849]
- Change dmalloc to use a size_t as the length argument to bring it
in line with the call it will make to malloc().
[ISC-Bugs #40843]
- If the failover socket can't be bound, close it. Otherwise if the
user configures an incorrect address in the failover stanza the
server will continue to open new sockets every 90 seconds until
it runs out.
[ISC-Bugs #42452]
- Add DHCPv4-mode, dhcrelay command line options, "-iu" and "-id", that
allow interfaces to be upstream or downstream respectively. Upstream
interfaces will accept and forward only BOOTP replies, while downstream
interfaces will accept and forward only BOOTP requests.
[ISC-Bugs #41547]
- Clean up some memory references in the vendor-class construct.
[ISC-Bugs #42984]
Changes since 4.3.4b1
- None
Changes since 4.3.3
- Corrected a static analyzer warning in common/execute.c
[ISC-Bugs #40374]
- ISC DHCP now follows the common convention to use the base name a
program is invoked with (aka argv[0], vs. a builtin name) for
logs. This should help differentiate syslog entries for DHCPv4 and
DHCPv6 servers. You can define OLD_LOG_NAME in includes/site.h to
keep the previous behavior.
[ISC-Bugs #38692]
- The Linux packet filter code now correctly treats only the least significant
12 bits in an inbound packet's TCI value as the VLAN id (per IEEE 802.1Q).
Prior to this it was using the entire 16 bit value as the VLAN id and
incorrectly discarding packets. Thanks to Jiri Popelka at Red Hat for
reporting this issue and supplying its patch.
[ISC-Bugs #40591]
- Fixed several static analysis issues such as potential null
references, unchecked strdup returns. Thanks to Bill Parker (wp02855 at
gmail dot com) who identified these issues and supplied patches to
address them.
[ISC-Bugs #40754]
[ISC-Bugs #40823]
- Corrected compilation errors that prohibited building the server
and its ATF unit tests when failover is disabled.
[ISC-Bugs #40372]
- Added the lease address to the end of the debug level log message
emitted when an existing lease is renewed within the dhcp-cache-threshold.
Thanks to Nathan Neulinger at Missouri S&T for suggesting the change.
[ISC-Bugs #40598]
- Added dhcpv6 and delayed-ack to settings listed in the "Features:"
section of the configure script output. Additionally, all of the
features reported on will now always show either a "yes" or "no"
value. Prior to this features left to their default setting would
not show a value.
[ISC-Bugs #40381]
- Added a parameter, authoring-byte-order, to the lease file. This value
is automatically added to the top of new lease files by the server and
indicates the internal byte order (big endian or little endian) of the
server. This permits lease files generated on a server with one form of
byte order to be used on a server with the opposite form. Our thanks to
Timothe Litt for calling this to our attention and for the suggestions
he provided.
[ISC-Bugs #38396]
- Fixed a small memory leak in the DHCPv6 version of the client code.
This is unlikely to cause significant issues in actual use.
[ISC-Bugs #40990]
- Corrected a few minor memory leaks in omapi's dereferencing of
host objects. Thanks to Jiri Popelka at Red Hat for reporting
the issue and supplying the patches.
[ISC-Bugs #33990]
[ISC-Bugs #41325]
- Cleaned up some of the Make infrastructure to make --with-libbind
work better. Though it still only works with an absolute path.
[ISC-Bugs #39210]
- Made the embedded bind libraries able to be cross compiled
(please refer to the bind9 documentation to learn how to cross
compile DHCP and its bind library dependency).
[ISC-Bugs #38836]
- Update the client code to better support getting IA_NAs and IA_PDs
in the same packet, see RFC7550 for some discussion.
[ISC-Bugs #40190]
! Update the bounds checking when receiving a packet.
Thanks to Sebastian Poehn from Sophos for the bug report and a suggested
patch.
[ISC-Bugs #41267]
CVE: CVE-2015-8605
- When handling an incorrect command line for dhcpd, dhclient or dhcrelay
print out a specific error message about the first error in addition
to the usage string. This may be disabled by editing includes/site.h.
[ISC-Bugs #40321]
[ISC-Bugs #41454]
- The configure script will now exit with an error message if it cannot find
a GNU-style make tool (needed when building BIND libraries) or pkg-config
(needed to locate ATF used for building unit tests). Prior to this the
script would exit indicating success causing subsequent attempts to build
the software to fail.
[ISC-Bugs #40371]
- Properly terminate strings before passing them to regex and fix
a boundary error when creating certain new data strings.
Thanks to Andrey Jr. Melnikov for the bug report.
[ISC-Bugs #41217]
- Option expressions, such as prepend and append, are now supported when
running dhclient for IPv6. Prior to this such statements in the
client configuration file would be parsed but have no affect. Thanks
to Jiri Popelka at Red Hat for reporting the issue.
[ISC-Bugs #39952]
- A failover primary server will now accept a binding status update from the
secondary which transitions a lease from ACTIVE to ABANDONED. This accounts
for instances in which a client declines a lease and only the secondary
server receives it. Prior to this the primary server would reject such an
update as an "invalid state transition".
[ISC_BUGS #25189]
- Properly allocate memory for a bpf filter.
Thanks to Bill Parker (wp02855 at gmail dot com) who identified this issue.
[ISC-Bugs #41485]
- Updated contrib/dhcp-lease-list.pl to handle garbage in the oui file better
and to print out the hostnames a bit better.
Thanks to Antoine Beaupré from Debian for the suggested patch.
[ISC-Bugs #41288]
- The DHCPv6 server now handles long valid and preferred lease times better.
Values that would cause the internal end time of the lease to wrap are
modified to work as infinite.