Dhcp 4.1 ESV R10b1 RELNOTES Guest on 26th June 2020 08:06:57 PM
  1.               Internet Systems Consortium DHCP Distribution
  2.                             Version 4.1-ESV-R10b1
  3.                                8 July 2014
  5.                               Release Notes
  7.                               NEW FEATURES
  9. Version 4.1-ESV-R10 is a maintenance release of an extended support version
  10. (ESV) release.  ESVs are intended for users who have longer upgrade
  11. constraints.  Please see our web page
  12. http://www.isc.org/downloads/extended-support
  13. for more information on ESVs.
  15. ISC DHCP 4.1.x includes several new DHCPv6 features that were not included
  16. in DHCP 4.0.x.  These include:
  18. - Support for the rapid-commit option on the client side
  20. - Prefix Delegation support
  22. - IA_TA address support
  24. - A basic DHCPv6 relay agent
  26. - Basic and partial DHCPv6 leasequery support
  28. There are a number of DHCPv6 limitations and features missing in this
  29. release, which will be addressed in the future:
  31. - Only Solaris, Linux, FreeBSD, NetBSD, and OpenBSD are supported.
  33. - Only a single address is supported per IA.
  35. - DHCPv6 includes human-readable text in status code messages. These
  36.   should be configurable, and probably localized via gettext() or the
  37.   like.
  39. - The "host-identifier" option is limited to a simple token.
  41. - The client and server can only operate DHCPv4 or DHCPv6 at a time,
  42.   not both.  To use both protocols simultaneously, two instances of the
  43.   relevant daemon are required, one with the '-6' command line option.
  45. For information on how to install, configure and run this software, as
  46. well as how to find documentation and report bugs, please consult the
  47. README file.
  49. ISC DHCP uses standard GNU configure for installation. Please review the
  50. output of "./configure --help" to see what options are available.
  52. The system has only been tested on Linux, FreeBSD, and Solaris, and may not
  53. work on other platforms. Please report any problems and suggested fixes to
  55. ISC DHCP is open source software maintained by Internet Systems
  56. Consortium.  This product includes cryptographic software written
  57. by Eric Young ([email protected]).
  59.                         Changes since 4.1-ESV-R9
  61. - Tidy up several small tickets
  62.   Correct parsing of DUID from config file, previously the LL type
  63.   was put in the wrong place in the DUID string.
  64.   [ISC-Bugs #20962]
  65.   Add code to parse "do-forward-updates" as well as "do-forward-update"
  66.   Thanks to Jiri Popelka at Red Hat.
  67.   [ISC-Bugs #31328]
  68.   Remove log_priority as it isn't currently used.
  69.   [ISC-Bugs #33397]
  70.   Increase the size of the buffer used for reading interface information.
  71.   [ISC-Bugs #34858]
  73. - Remove an extra set of the msg_controllen variable.
  74.   [ISC-Bugs #21035]
  76. - Add a more understandable error message if a configuration attempts
  77.   to add multiple keys for a single zone.  Thanks to a patch from Jiri
  78.   Popelka at Red Hat.
  79.   [ISC-Bugs #31892]
  81. - Fix some minor issues in the dst code.
  82.   [ISC-Bugs #34172]
  84. - Update the partner's stos (start time of state, basically when we last
  85.   heard from this partner) field when updating the state in failover.
  86.   [ISC-Bugs #35549]
  88. - Modify the overload processing to allow space for the remote agent ID
  89.   [ISC-Bugs #35569]
  90.   Handle the ordering of the SUBNET_MASK option even if it is the last
  91.   option in the list.
  92.   [ISC-Bugs #24580]
  94. - #ifdef variables used in RFC3315_PRE_ERRATA code.
  95.   [ISC-Bugs #28938]
  97. - Remove unused RCSID tags.
  98.   [ISC-Bugs #35846]
  100. - Correct the v6 client timing code.  When doing the timing backoff
  101.   for MRT limit it to MRD.
  102.   Thanks to Jiri Popelka at Red Hat for the bug and fix.
  103.   [ISC-Bugs #21238
  105. - Some minor cleanups in the client code
  106.   In addition to checking for dhcpc check for bootpc in the services list
  107.   [ISC-Bugs #18933]
  108.   Correct the client code to only try to get a lease once when the
  109.   given the "-1" argument.
  110.   Thanks to Jiri Popelka at Red Hat for the bug and fix.
  111.   [ISC-Bugs #26735]
  112.   When asked for the version don't send the output to syslog.
  113.   [ISC-Bugs #29772]
  114.   Add the next server information to the environment variables for
  115.   use by the client script.  In order to avoid changing the client
  116.   lease file the next server information isn't written to it.
  117.   Thanks to Tomas Hozza at Red Hat for the suggestion and a prototype fix.
  118.   [ISC-Bugs #33098]
  120. - Add the "enable-log-pid" option to the configure script.  When enabled
  121.   this causes the client, server and relay programs to include the PID
  122.   number in syslog messages.
  123.   Thanks to Marius Tomaschewski for the suggestion and proto-patch.
  124.   [ISC-Bugs #29713]
  126. - Add a #define to specify the prefix length used when a client attempts
  127.   to configure an address.  This can be modified by editing includes/site.h.
  128.   By default it is set to 64.  While 128 might be a better choice it would
  129.   also be a change for currently running systems, so we have left it at 64.
  130.   [ISC-Bugs #DHCP-2]
  132. - Have the client fsync the lease file to avoid lease corruption if the
  133.   client hibernates or otherwise shuts down.
  134.   [ISC-Bugs #35894]
  136. - Add a check for L2VLAN in bpf.c to help support VLAN interfaces
  137.   Thanks to Steinar Haug for the suggestion.
  138.   [ISC-Bugs #36033]
  140. - Add code to properly dereference a pointer in the dhclient code
  141.   on an error condition.
  142.   [ISC-Bugs #36194
  144. - Add code to help clean up soft leases.
  145.   [ISC-Bugs #36304]
  147.                         Changes since 4.1-ESV-R9rc1
  149. - None
  151.                         Changes since 4.1-ESV-R9b1
  153. - Tidy up receive packet processing.
  154.   Thanks to Brad Plank of GTA for reporting the issue and suggesting
  155.   a possible patch.
  156.   [ISC-Bugs #34447]
  157.                         Changes since 4.1-ESV-R8
  159. - Modify the server code to only prohibit the administrator from configuring
  160.   some options in the dhcp universe instead of all universes.
  161.   [ISC-Bugs #32309]
  163. - Address static analysis warnings.
  164.   [ISC-Bugs #33510] [ISC-Bugs #33511]
  166. - Silence benign static analysis warnings.
  167.   [ISC-Bugs #33428]
  169. - Add check for 64-bit package for atf.
  170.   [ISC-BUGS #32206]
  172. - Use newer auto* tool packages and turn on RFC_3542 support on Mac OS.
  173.   [ISC-Bugs #26303]
  175. - Remove a variable when it isn't being used due to #ifdefs to avoid
  176.   a compiler warning on Solaris using GCC.
  177.   [ISC-Bugs #33032]
  179. - Add a check for too much whitespace in a config or lease file.
  180.   Thanks to Paolo Pellegrino for finding the issue and a suggestion
  181.   for the patch.
  182.   [ISC-Bugs #33351]
  184. - Added a sleep call after killing the old client to allow time
  185.   for the sockets to be cleaned.  This should allow the -r option
  186.   to work more consistently.
  187.   [ISC-Bugs #18175]
  189. - Missing files for ISC DHCP Developer's Guide are now included in
  190.   the release tarballs. To generate this documentation, please use
  191.   make devel command in doc directory. [ISC-Bugs #32767]
  193. - Update client script for use with openwrt.
  194.   [ISC-Bugs #29843]
  196. - Fix the socket handling for DHCPv6 clients to allow multiple instances
  197.   of a client on a single machine to work properly.  Previously only
  198.   one client would receive the packets.  Thanks to Jiri Popelka at Red Hat
  199.   for the bug report and a potential patch.
  200.   [ISC-Bugs #34784]
  202. - Enhance the DHCPv6 server logging to include the addresses that are assigned
  203.   to the clients.  This can be enabled by defining LOG_V6_ADDRESSES in site.h.
  204.   [ISC-Bugs #26377]
  206.                         Changes since 4.1-ESV-R8rc1
  207. - None
  209.                         Changes since 4.1-ESV-R8b1
  211. - Modify test makefiles to be more similar to standard makefiles
  212.   and comment out a currently unused test.
  213.   [ISC-Bugs #32089]
  215.                         Changes since 4.1-ESV-R7
  217. - Update the memory leakage debug code to work with v6.
  218.   [ISC-Bugs #30297]
  220. - Modify the failover code to handle incorrect peer names
  221.   better.  Previously the structure holding the name might
  222.   have been freed inappropriately in some cases and not
  223.   freed in other cases.
  224.   [ISC-Bugs #30320]
  226. - Add a configue option, enable-secs-byteorder, to deal with
  227.   clients that do the byte ordering on the secs field incorrectly.
  228.   This field should be in network byte order but some clients
  229.   get it wrong.  When this option is enabled the server will examine
  230.   the secs field and if it looks wrong (high byte non zero and low
  231.   byte zero) swap the bytes.  The default is disabled.  This option
  232.   is only useful when doing load balancing within failover.
  233.   [ISC-Bugs #26108]
  235. - Fix a set of issues that were discovered via a code inspection
  236.   tool.  Thanks to Jiri Popelka and Tomas Hozza Red Hat for the logs
  237.   and patches.
  238.   [ISC-Bugs #23833]
  240. - Parsing unquoted base64 strings improved. Parser now properly handles
  241.   strings that contain reserved names. [ISC-Bugs #23048]
  243. - Modify the nak_lease function to make some attempts to find a
  244.   server-identifier option to use for the NAK.  This feature is
  245.   enabled by defining SERVER_ID_FOR_NAK in includes/site.h and
  246.   currently defaults to disabled.
  247.   [ISC-Bugs #25689]
  249. - The client now passes information about the options it requested
  250.   from the server to the script code via environment variables.
  251.   These variables are of the form requested_<option_name>=1 with
  252.   the option name being the same as used in the new_* and old_*
  253.   variables.
  254.   [ISC-Bugs #29068]
  256. - Add support for a simple check that the server id in a request message
  257.   to a failover peer matches the server id of the server.  This support
  258.   is enabled by editing the file includes/site.h and uncommenting the
  259.   definition for SERVER_ID_CHECK.  The option has several restrictions
  260.   and issues - please read the comment in the site.h file before
  261.   enabling it.
  262.   [ISC-Bugs #31463]
  264. - Tidy up some compiler issues in the debug code.
  265.   [ISC-Bugs #26460]
  267. - Move the dhcpd.conf example file to dhcpd.conf.example to avoid
  268.   overwriting the dhcpd.conf file when installing a new version of
  269.   ISC DHCP.  The user will now need to manual copy and edit the
  270.   dhcpd.conf file as desired.
  271.   [ISC-Bugs #19337]
  273. - Remove an unused variable to keep compilers happy.
  274.   [ISC-Bugs #31983]
  276.                         Changes since 4.1-ESV-R6
  278. - Existing legacy unit-tests have been migrated to Automated Test
  279.   Framework (ATF). Several new tests have been developed. To enable
  280.   unit-tests, please use --with-atf in configure script. A Developer's
  281.   Guide has been added. To generate it, please use make devel in
  282.   the doc directory. It is currently in early stages of development,
  283.   but is expected to grow in the near future. [ISC-Bugs 25901]
  285. ! An issue with the use of lease times was found and fixed.  Making
  286.   certain changes to the end time of an IPv6 lease could cause the
  287.   server to abort.  Thanks to Glen Eustace of Massey University,
  288.   New Zealand for finding this issue.
  289.   [ISC-Bugs #30281]
  290.   CVE: CVE-2012-3955
  292.                         Changes since 4.1-ESV-R5
  294. - Correct code to calculate timing values in client to compare
  295.   rebind value to infinity instead of renew value.
  296.   Thanks to Chenda Huang from H3C Technologies Co., Limited
  297.   for reporting this issue.
  298.   [ISC-Bugs #29062]
  300. - Fix some issues in the code for parsing and printing options.
  301.   [ISC-Bugs #22625] - properly print options that have several fields
  302.   followed by an array of something for example "fIa"
  303.   [ISC-Bugs #27289] - properly parse options in declarations that have
  304.   several fields followed by an array of something for example "fIa"
  305.   [ISC-Bugs #27296] - properly determine if we parsed a 16 or 32 bit
  306.   value in evaluate_numeric_expression (extract-int).
  307.   [ISC-Bugs #27314] - properly parse a zero length option from
  308.   a lease file.  Thanks to Marius Tomaschewski from SUSE for the report
  309.   and prototype patch for this ticket as well as ticket 27289.
  311. ! Previously the server code was relaxed to allow packets with zero
  312.   length client ids to be processed.  Under some situations use of
  313.   zero length client ids can cause the server to go into an infinite
  314.   loop.  As such ids are not valid according to RFC 2132 section 9.14
  315.   the server no longer accepts them.  Client ids with a length of 1
  316.   are also invalid but the server still accepts them in order to
  317.   minimize disruption.  The restriction will likely be tightened in
  318.   the future to disallow ids with a length of 1.
  319.   Thanks to Markus Hietava of Codenomicon CROSS project for the
  320.   finding this issue and CERT-FI for vulnerability coordination.
  321.   [ISC-Bugs #29851]
  322.   CVE: CVE-2012-3571
  324. ! A pair of memory leaks were found and fixed.  Thanks to
  325.   Glen Eustace of Massey University, New Zealand for finding
  326.   this issue.
  327.   [ISC-Bugs #30024]
  328.   CVE: CVE-2012-3954
  330.                         Changes since 4.1-ESV-R5rc2
  332. - None
  334.                         Changes since 4.1-ESV-R5rc1
  336. - Rotate the lease file when running in v6 mode.
  337.   Thanks to Christoph Moench-Tegeder at Astaro for the
  338.   report and the first version of the patch.
  339.   [ISC-Bugs #24887]
  341.                         Changes since 4.1-ESV-R5b1
  343. - None
  345.                         Changes since 4.1-ESV-R4
  347. - Fixed the code that checks if an address the server is planning
  348.   to hand out is in a reserved range.  This would appear as
  349.   the server being out of addresses in pools with particular ranges.
  350.   [ISC-Bugs #26498]
  352. - Tidy up the receive calls and eliminate the need for found_pkt.
  353.   [ISC-Bugs #25066]
  355. - Add support for Infiniband over sockets to the server and
  356.   relay code.  We've tested this on Solaris and hope to expand
  357.   support for Infiniband in the future.  This patch also corrects
  358.   some issues we found in the socket code.
  359.  [ISC-Bugs #24245]
  361. - Add a compile time check for the presence of the noreturn attribute
  362.   and use it for log_fatal if it's available.  This will help code
  363.   checking programs to eliminate false positives.
  364.   [ISC-Bugs #27539]
  366. - Fixed many compilation problems ("set, but not used" warnings) for
  367.   gcc 4.6 that may affect Ubuntu 11.10 users.
  368.   [ISC-Bugs #27588]
  370. - Remove outdated note in the description of the bootp keyword about the
  371.   option not satisfying the requirement of failover peers for denying
  372.   dynamic bootp clients.
  373.   [ISC-bugs #28574]
  375. - Multiple items to clean up IPv6 address processing.
  376.   When processing an IA that we've seen check to see if the
  377.   addresses are usable (not in use by somebody else) before
  378.   handing it out.
  379.   When reading in leases from the file discard expired addresses.
  380.   When picking an address for a client include the IA ID in
  381.   addition to the client ID to generally pick different addresses
  382.   for different IAs.
  383.   [ISC-Bugs #23138] [ISC-Bugs #27945] [ISC-Bugs #25586]
  384.   [ISC-Bugs #27684]
  386. - Remove unnecessary checks in the lease query code and clean up
  387.   several compiler issues (some dereferences of NULL and treating
  388.   an int as a boolean).
  389.   [ISC-Bugs #26203]
  391. - Fix the NA and PD allocation code to handle the case where a client
  392.   provides a preference and the server doesn't have any addresses or
  393.   prefixes available.  Previoulsy the server ignored the request with
  394.   this patch it replies with a NoAddrsAvail or NoPrefixAvail response.
  395.   By default the code performs according to the errata of August 2010
  396.   for RFC 3315 section 17.2.2; to enable the previous style see the
  397.   section on RFC3315_PRE_ERRATA_2010_08 in includes/site.h.  This option
  398.   may be removed in the future.
  399.   Thanks to Jiri Popelka at Red Hat for the patch.
  400.   [ISC-Bugs #22676]
  402. - Fix up some issues found by static analysis.
  403.   A potential memory leak and NULL dereference in omapi.
  404.   The use of a boolean test instead of a bitwise test in dst.
  405.   [ISC-Bugs #28941]
  407.                         Changes since 4.1-ESV-R3
  409. - Add AM_MAINTAINER_MODE to configure.ac to avoid rebuilding
  410.   configuration files.  [ISC-Bugs #24107]
  412. ! Add a check for a null pointer before calling the regexec function.
  413.   Without this check we could, under some circumstances, pass
  414.   a null pointer to the regexec function causing it to segfault.
  415.   Thanks to a report from BlueCat Networks.
  416.   [ISC-Bugs #26704].
  417.   CVE: CVE-2011-4539
  419.                         Changes since 4.1-ESV-R3b1
  421. - Compilation fix for gcc 4.5 or newer in server/ddns.c
  422.   [ISC-Bugs #24973]
  424. - Strict checks for content of domain-name DHCPv4 option can now be
  425.   configured during compilation time. Even though RFC2132 does not allow
  426.   to store more than one domain in domain-name option, such behavior is
  427.   now enabled by default, but this may change some time in the future.
  428.   See ACCEPT_LIST_IN_DOMAIN_NAME define in includes/site.h.
  429.   [ISC-Bugs #24167]
  431. ! Two packets were found that cause a server to halt.  The code
  432.   has been updated to properly process or reject the packets as
  433.   appropriate.  Thanks to David Zych at University of Illinois
  434.   for reporting this issue.  [ISC-Bugs #24960]
  435.   One CVE number for each class of packet.
  436.   CVE-2011-2748
  437.   CVE-2011-2749
  439.                         Changes since 4.1-ESV-R2
  441. - DHCPv6 server now responds properly if client asks for a prefix that
  442.   is already assigned to a different client. [ISC-Bugs #23948]
  444. - Fix the handling of connection requests on the failover port.
  445.   This was a security issue in 4.2.0 but is not in  4.1.x.
  446.   [ISC-Bugs #22679]
  448. - When processing the format flags for a given option consume the
  449.   flag indicating an optional value correctly.  A symptom of this
  450.   bug was an infinite loop when trying to parse the slp-service-scope
  451.   option.  Thanks to a patch from Marius Tomaschewski.
  452.   [ISC-Bugs #22055]
  454. - Modify the dlpi code to accept getmsg() returning a positive value.
  455.   [ISC-Bugs #22824]
  457. - Removed the restriction on using IPv6 addresses in IPv4 mode.  This
  458.   allows IPv4 options which contain IPv6 addresses to be specified.  For
  459.   example the 6rd option can be specified and used like this:
  460.   [ISC-Bugs #23039]
  462.         option 6rd code 212 = { integer 8, integer 8,
  463.                                 ip6-address, array of ip-address };
  464.         option 6rd 16 10 2001::,;
  466. - Add the option "--no-pid" to the client, relay and server code,
  467.   to disable writing a pid file.  Add the option "-pf pidfile"
  468.   to the relay to allow the user to supply the pidfile name at
  469.   runtime.  Add the "with-relay6-pid-file" option to configure
  470.   to allow the user to supply the pidfile name for the relay
  471.   in v6 mode at configure time.
  472.   [ISC-Bugs #23351] [ISC-Bugs #17541]
  474. - 'dhclient' no longer waits a random interval after first starting up to
  475.   begin in the INIT state.  This conforms to RFC 2131, but elects not to
  476.   implement a 'SHOULD' direction in section 4.1. [ISC-Bugs #19660]
  478. - Added 'initial-delay' parameter that specifies maximum amount of time
  479.   before client goes to the INIT state. The default value is 0. In previous
  480.   versions of the code client could wait up to 5 seconds. The old behavior
  481.   may be restored by using 'initial-delay 5;' in the client config file.
  482.   [ISC-Bugs #19660]
  484. - ICMP ping-check should now sit closer to precisely the number of seconds
  485.   configured (or default 1), due to making use of the new microsecond
  486.   scale timer internally to dhcpd.  This corrects a bug where the server
  487.   may immediately timeout an ICMP ping-check if it was made late in the
  488.   current second. [ISC-Bugs #19660]
  490. - The DHCP client will schedule renewal and rebinding events in
  491.   microseconds if the DHCP server provided a lease-time that would result
  492.   in sub-1-second timers.  This corrects a bug where a 2-second or lower
  493.   lease-time would cause the DHCP client to enter an infinite loop by
  494.   scheduling renewal at zero seconds. [ISC-Bugs #19660]
  496. - Client lease records are recorded at most once every 15 seconds.  This
  497.   keeps the client from filling the lease database disk quickly on very small
  498.   lease times. [ISC-Bugs #19660]
  500. - To defend against RFC 2131 non-compliant DHCP servers which fail to
  501.   advertise a lease-time (either mangled, or zero in value) the DHCP
  502.   client now adds the server to the reject list ACL and returns to INIT
  503.   state to hopefully find an RFC 2131 compliant server (or retry in INIT
  504.   forever). [ISC-Bugs #19660]
  506. - Parameters configured to evaluate from user defined function calls can
  507.   now be correctly written to dhcpd.leases (as on 'on events' or dynamic
  508.   host records inserted via OMAPI).  [ISC-Bugs #22266]
  510. - If a 'next-server' parameter is configured in a dynamic host record via
  511.   OMAPI as a domain name, the syntax written to disk is now correctly parsed
  512.   upon restart.  [ISC-Bugs #22266]
  514. - The DHCP server now responds to DHCPLEASEQUERY messages from agents using
  515.   IP addresses not covered by a subnet in configuration.  Whether or not to
  516.   respond to such an agent is still governed by the 'allow leasequery;'
  517.   configuration parameter, in the case of an agent not covered by a configured
  518.   subnet the root configuration area is examined. Server now also returns
  519.   vendor-class-id option, if client sent it. [ISC-Bugs #21094]
  521. - Documentation fixes
  522.   [ISC-Bugs #17959] add text to AIX section describing how to have it send
  523.   responses to the all-ones address.
  524.   [ISC-Bugs #19615] update the includes in dhcpctl/dhcpctl.3 to be more correct
  525.   [ISC-Bugs #20676] update dhcpd.conf.5 to include the RFC numbers for DDNS
  527. - Relay no longer crashes, when DHCP packet is received over interface without
  528.   any IPv4 address assigned. [ISC-Bugs #22409]
  530. - Linux Packet Filter interface improvement. sockaddr_pkt structure is used,
  531.   rather than sockaddr. Packet etherType is now forced to ETH_P_IP.
  532.   [ISC-Bugs #18975]
  534. - Minor code cleanups - but note port change for #23196
  535.   [ISC-Bugs #23470] - Modify when an ignore return macro is defined to
  536.   handle unsed error return warnings for more versions of gcc.
  537.   [ISC-Bugs #23196] - Modify the reply handling in the server code to
  538.   send to a specified port rather than to the source port for the incoming
  539.   message.  Sending to the source port was test code that should have
  540.   been removed.  The previous functionality may be restored by defining
  541.   REPLY_TO_SOURCE_PORT in the includes/site.h file.  We suggest you don't
  542.   enable this except for testing purposes.
  543.   [ISC-Bugs #22695] - Close a file descriptor in an error path.
  544.   [ISC-Bugs #19368] - Tidy up variable types in validate_port.
  546. - Code cleanup
  547.   [ISC-Bugs #13151] remove obsolete PROTO, KandR, INLINE and ANSI_DECL macros
  549. - Compilation problem with gcc4.5 and omshell.c resolved. [ISC-Bugs #23831]
  551. - Client Script fixes
  552.   [ISC-Bugs #23045] Typos in client/scripts/openbsd
  553.   [ISC-Bugs #23565] In the client scripts add a zone id (interface id) if
  554.   the domain search address is link local.
  555.   [ISC-Bugs #1277] In some of the client scripts add code to handle the
  556.   case of the default router information being changed without the address
  557.   being changed.
  559. - Enlarge the buffer size used by the Omshell code and some of the
  560.   print routines to allow for greater than 60 characters or, when
  561.   printing as hex strings, 20 characters.  [ISC-Bugs #22743]
  563. - In Solaris 11 switch to using sockets instead of DLPI, thanks
  564.   to a patch form Oracle.  [ISC-Bugs #24634].
  566.                         Changes since 4.1-ESV-R1
  568. ! In dhclient check the data for some string options for
  569.   reasonableness before passing it along to the script that
  570.   interfaces with the OS.
  571.   [ISC-Bugs #23722]
  572.   CVE: CVE-2011-0997
  574.                         Changes since 4.1-ESV
  576. ! When processing a request in the DHCPv6 server code that specifies
  577.   an address that is tagged as abandoned (meaning we received a
  578.   decline request for it previously) don't attempt to move it from
  579.   the inactive to active pool as doing so can result in the server
  580.   crshing on an assert failure.  Also retag the lease as active
  581.   and reset its timeout value.
  582.   [ISC-Bugs #21921]
  584.                         Changes since 4.1.2
  586. - ./configure on longer searches for -lcrypto to explicitly link against.
  587.   This fixes a bug where 'dhclient' would have shared library dependencies
  588.   on '/usr/lib'.  [ISC-Bugs #21967]
  590. - Restore printing of values in omshell to the style pre 21585.  For
  591.   21585 we changed the print routines to always display time values
  592.   as a hex list.  This had a side effect of printing all data strings
  593.   as a hex list.  We shall investigate other ways of displaying time
  594.   values more usefully.  [ISC-Bugs #22626]
  596.                         Changes since 4.1.2rc1
  598. ! Handle a relay forward message with an unspecified address in the
  599.   link address field.  Previously such a message would cause the
  600.   server to crash.  Thanks to a report from John Gibbons.  [ISC-Bugs #21992]
  601.   CERT: VU#102047 CVE: CVE-2010-3611
  603.                         Changes since 4.1.2b1
  605. - Update the code to parse dhcpv6 lease files to accept a semi-colon at
  606.   the end of the max-life and preferred-life clauses.  In order to be
  607.   backwards compatible with older lease files not finding a semi-colon
  608.   is also accepted.  [ISC-Bugs #22303].
  610.                         Changes since 4.1.1
  612. - Cleaned up some compiler warnings
  614. - Prohibit including lease time information in a response to a DHCP INFORM
  615.   Bug ticket 21092.
  617. ! Accept a client id of length 0 while hashing.  Previously the server would
  618.   exit if it attempted to hash a zero length client id, providing attackers
  619.   with a simple denial of service attack.  Bug ticket 21253.
  620.   CERT: VU#541921 - CVE: CVE-2010-2156
  622. - A bug was fixed that could cause the DHCPv6 server to advertise/assign a
  623.   previously allocated (active) lease to a client that has changed subnets,
  624.   despite being on different shared networks.  Dynamic prefixes specifically
  625.   allocated in shared networks also now are not offered if the client has
  626.   moved.  [ISC-Bugs #21152]
  628. - Add declaration for variable in debug code in alloc.c.  [ISC-Bugs #21472]
  630. - Documentation cleanup covering multiple tickets
  631.   [ISC-Bugs #20265] [ISC-Bugs #20259] [ISC-Bugs #19536] minor cleanup
  632.   [ISC-Bugs #20263] add text describing some default values
  633.   [ISC-Bugs #20193] single quotes at the start of a line indicate a control
  634.   line to nroff, escape them if we actually want a quote.
  635.   [ISC-Bugs #18916] sync the pointer to web pages amongst the different docs
  636.   [ISC-Bugs #20107] clarify description of ia-pd and ia-prefix.
  637.   [ISC-Bugs #20245] clarify editing the failover state in a lease file to put
  638.   a server into the PARTNER-DOWN state.
  640. - 'get-host-names true;' now also works even if 'use-host-decl-names true;'
  641.   was also configured.  The nature of this repair also fixes another
  642.   error; the host-name supplied by a client is no longer overridden by a
  643.   reverse lookup of the lease address.  Thanks to a patch from Wilco Baan
  644.   Hofman supplied to us by the Debian package maintenance team.
  645.   [ISC-Bugs #21691] {Debian Bug#509445}
  647. - The .TH tag for the dhcp-options manpage was typo repaired
  648.   thanks to a report from jidanni and the Debian package maintenance
  649.   team.  [ISC-Bugs #21676] {Debian Bug#563613}
  651. - More documentation changes - primarily to put the options in the dhclient
  652.   and dhcpd man pages into the standard form.  Thanks in part to a patch
  653.   from David Cantrell at Red Hat.
  654.   [ISC-Bugs #20264] and parts of [ISC-Bugs #17744] dhclient.8 changes
  656. - Minor compilation errors - type mismatches, extra semi-colons after macros
  657.   [ISC-Bugs #20884] [ISC-Bugs #20953] [ISC-Bugs #20955]
  659. - Add code to clear the pointer to an object in an OMAPI handle when the
  660.   object is freed due to a dereference.  [ISC-Bugs #21306]
  662. - Fixed a bug that leaks host record references onto lease structures,
  663.   causing the server to apply configuration intended for one host to any
  664.   other innocent clients that come along later.  [ISC-Bugs #22018]
  666. - Minor code fixes
  667.   [ISC-Bugs #19566] When trying to find the zone for a name for ddns allow
  668.   the name to be at the apex of the zone.
  669.   [ISC-Bugs #19617] Restrict length of interface name read from command line
  670.   in dhcpd - based on a patch from David Cantrell at Red Hat.
  671.   [ISC-Bugs #20039] Correct some error messages in dhcpd.c
  672.   [ISC-Bugs #20070] Better range check on values when creating a DHCID.
  673.   [ISC-Bugs #20198] Avoid writing past the end of the field when adding
  674.   overly long file or server names to a packet and add a log message
  675.   if the configuration supplied overly long names for these fields.
  676.   Thanks to Martin Pala.
  677.   [ISC-Bugs #21497] Add a little more randomness to rng seed in client
  678.   thanks to a patch from Jeremiah Jinno.
  680. - Correct error handling in DLPI [ISC-Bugs #20378]
  682. - Remove __sun__ and __hpux__ typedefs in osdep.h as they are now being
  683.   checked in configure.  [ISC-Bugs #20443]
  685. - Modify how the cmsg header is allocated the v6 send and received routines
  686.   to compile on more compilers.  [ISC-Bugs #20524]
  688. - When parsing a domain name free the memory for the name after we are
  689.   done with it.  [ISC-Bugs #20824]
  691. - Add an elapsed time option to the release message and refactor the
  692.   code to move most of the common code to a single routine.
  693.   [ISC-Bugs #21171].
  695. - Parse date strings more properly - the code now handles semi-colons in
  696.   date strings correctly.  Thanks to a patch from Jiri Popelka at Red Hat.
  697.   [ISC-Bugs #21501, #20598]
  699. - Fixes to lease input and output.
  700.   [ISC-Bugs #20418] - Some systems don't support the "%s" argument to
  701.   strftime, paste together the same string using mktime instead.
  702.   [ISC-Bugs #19596] - When parsing iaid values accept printable
  703.   characters.
  704.   [ISC-Bugs #21585] - Always print time values in omshell as hex
  705.   instead of ascii if the values happen to be printable characters.
  707. - Minor changes for scripts, configure.ac and Makefiles
  708.   [ISC-Bugs #19147] Use domain-search instead of domain-name in manual and
  709.                     example conf file.  Thanks to a patch from David Cantrell
  710.                     at Red Hat.
  711.   [ISC-Bugs #19761] Restore address when doing a rebind in DHCPv6
  712.   [ISC-Bugs #19945] Properly close the quote on some arguments.
  713.   [ISC-Bugs #20952] Add 64 bit types to configure.ac
  714.   [ISC-Bugs #21308] Add "PATH=" to CLIENT_PATH envrionment variable
  716. ! Handle pipe failures more gracefully.  Some OSes pass a SIGPIPE
  717.   signal to a process and will kill the process if the signal isn't
  718.   caught.  This patch adds code to turn off the SIGPIPE signal via
  719.   a setsockopt() call and to ignore the SIGPIPE signal in case the
  720.   OS doesn't support the necessary setsockopt() option.  This problem
  721.   was found during internal testing when the two servers in a failover
  722.   pair were repeatedly unable to communicate for longer than the
  723.   max-response-delay value.  Eventually one of the pair attempted a
  724.   write() call at just the same time as the other server killed the
  725.   connection and caused an uncaught SIGPIPE signal which caused the
  726.   OS to kill the server.
  727.   This is a minor security issue.  It is a security issue as it can
  728.   cause a server to stop.  It is minor as the attacker would need to
  729.   be able to interrupt traffic between the partners in a failover
  730.   pair for max-response-delay seconds at will - in which case the
  731.   defender has bigger problems than the DHCP server being killed.
  732.   Using the NIST CVSS security vulnerability rating system this
  733.   issue scored 1.2, meaning it is not a major risk for users.
  734.   [ISC-Bugs #22269]
  736.                         Changes since 4.1.1rc1
  738. - When using 'ignore client-updates;', the FQDN returned to the client
  739.   is no longer truncated to one octet.
  741.                         Changes since 4.1.1b3
  743. - None.
  745.                         Changes since 4.1.1b2
  747. - Fix test in dhcp_interface_signal_handler to check that the inner handler
  748.   has a signal_handler before calling it.
  750. - Both host and subnet6 configuration groups are now included whether a
  751.   fixed-address6 (DHCPv6) is in use or not.  Host scoped configuration takes
  752.   precedence.  This fixes two bugs, one where host scoped configuration
  753.   would not be included from a non-fixed-address6 host record, and the equal
  754.   and opposite bug where subnet6 scoped configuration would not be used when
  755.   over-riding values were not present in a matching fixed-address6 host
  756.   configuration.
  758. - ./configure now checks to ensure the intX_t and u_intX_t types are defined,
  759.   correcting a compilation failure when using Sun's compiler.
  761. - Modified the handling of a connection to avoid releasing the omapi io
  762.   object for the connection while it is still in use.  One symptom from
  763.   this error was a segfault when a failover secondary attempted to connect
  764.   to the failover primary if their clocks were not synchronized.
  766.                         Changes since 4.1.1b1
  768. - Remove infinite loop in token_print_indent_concat().
  770. - Memory leak in the load_balance_mine() function is fixed.  This would
  771.   leak ~20-30 octets per DHCPDISCOVER packet while failover was in use
  772.   and in normal state.
  774. - Various compilation fixes have been included for the memory related
  775.   DEBUG #defines in includes/site.h.
  777. - Fixed Linux client script 'unary operator expected' errors with DHCPv6.
  779. - Fixed setting hostname in Linux hosts that require hostname argument
  780.   to be double-quoted.  Also allow server-provided hostname to
  781.   override hostnames 'localhost' and '(none)'.
  783. - Added client support for setting interface MTU and metric, thanks to
  784.   Roy "UberLord" Marples <[email protected]>.
  786. - Fixed failover reconnection retry code to continue to retry to reconnect
  787.   rather than restarting the listener.
  789. - Compilation on Solaris with USE_SOCKETS defined in includes/site.h has
  790.   been repaired.  Other USE_ overrides should work better.
  792. - A check for the local flavor of IFNAMSIZ had a broken 'else' condition,
  793.   that probably still resulted in the correct behaviour (but wouldn't use
  794.   a larger defined value provided by the host OS).
  796. - Fixed a bug where an OMAPI socket disconnection message would not result
  797.   in scheduling a failover reconnection, if the link had not negotiated a
  798.   failover connect yet (e.g.: connection refused, asynch socket connect()
  799.   timeouts).
  801. - A bug was fixed that caused the 'conflict-done' state to fail to be parsed
  802.   in failover state records.
  804. ! A stack overflow vulnerability was fixed in dhclient that could allow
  805.   remote attackers to execute arbitrary commands as root on the system,
  806.   or simply terminate the client, by providing an over-long subnet-mask
  807.   option.  CERT VU#410676 - CVE-2009-0692
  809. - Versions 3.0.x syntax with multiple name->code option definitions is now
  810.   supported.  Note that, similarly to 3.0.x, for by-code lookups only the
  811.   last option definition is used.
  813. - Fixed a bug where a time difference of greater than 60 seconds between a
  814.   failover pair could cause the primary to crash on contact with the
  815.   secondary.  Thanks to a patch from Steinar Haug.
  817. - Don't look for IPv6 interfaces on Linux when running in DHCPv4 mode.
  818.   Thanks to patches from Matthew Newton and David Cantrell.
  820. - Secondary servers in a failover pair will now perform ddns removals if
  821.   they had performed ddns updates on a lease that is expiring, or was
  822.   released through the primary.  As part of the same fix, stale binding scopes
  823.   will now be removed if a change in identity of a lease's active client is
  824.   detected, rather than simply if a lease is noticed to have expired (which it
  825.   may have expired without a failover server noticing in some situations).
  827. - A patch supplied by David Cantrell at RedHat was applied that detects
  828.   invalid calling parameters given to the ns_name_ntop() function.
  829.   Specifically, it detects if the caller passed a pointer and size pair
  830.   that causes the pointer to integer-wrap past zero.
  832. ! Fixed a fenceposting bug when a client had two host records configured,
  833.   one using 'uid' and the other using 'hardware ethernet'.  CVE-2009-1892
  835.                         Changes since 4.1.0
  837. - Validate the argument to the -p option.
  839. - The notorious 'option <unknown> ... larger than buffer' log line,
  840.   which is seen in some malformed DHCP client packets, was modified.
  841.   It now logs the universe name, and does not log the length values
  842.   (which are bogus corruption read from the packet anyway).  It also
  843.   carries a hopefully more useful explanation.
  845. - A bug was fixed that caused the server not to answer some valid Solicit
  846.   and Request packets, if the dynamic range covering any requested addresses
  847.   had been deleted from configuration.
  849. - Suppress spurious warnings from configure about --datarootdir
  851. - Update the code to deal with GCC 4.3.  This included two sets of changes.
  852.   The first is to the configuration files to include the use of
  853.   AC_USE_SYSTEM_EXTENSIONS.  The second is to deal with return values that
  854.   were being ignored.
  856. - The db-time-format option was documented in manpages.
  858. - Using reserved leases no longer results in 'lease with binding state
  859.   free not on its queue' error messages, thanks to a patch from Frode
  860.   Nordahl.
  862. - DDNS removal routines were updated so that the DHCID is not removed until
  863.   the client has been deprived of all A and AAAA records (not only the last
  864.   one of either of those).  This resolves a bug where dual stack clients
  865.   would not be able to regain their names after either expiration event.
  867. - Fix a build error in dhcrelay, using older versions of gcc with
  868.   dhcpv6 disabled.
  870. - Two uninitialized stack structures are now memset to zero, thanks to
  871.   patch from David Cantrell at Red Hat.
  873. - Fixed a cosmetic bug where pretty-printing valid domain-search options would
  874.   result in an erroneous error log message ('garbage in format string').
  876. - A bug in DLPI packet transmission (Solaris, HP/UX) that caused the server
  877.   to stop receiving packets is fixed.  The same fix also means that the MAC
  878.   address will no longer appear 'bogus' on DLPI-based systems.
  880. - A bug in select handling was discovered where the results of one select()
  881.   call were discarded, causing the server to process the next select() call
  882.   and use more system calls than required.  This has been repaired - the
  883.   sockets will be handled after the first return from select(), resulting in
  884.   fewer system calls.
  886. - The update-conflict-detection feature would leave an FQDN updated without
  887.   a DHCID (still currently implemented as a TXT RR).  This would cause later
  888.   expiration or release events to fail to remove the domain name.  The feature
  889.   now also inserts the client's up to date DHCID record, so records may safely
  890.   be removed at expiration or release time.  Thanks to a patch submitted by
  891.   Christof Chen.
  893.                         Changes since 4.1.0b1
  895. - A missing "else" in dhcrelay.c could have caused an interface not to
  896.   be recognized.
  898.                         Changes since 4.1.0a2
  900. - A cosmetic bug in DHCPDECLINE processing was fixed which caused all
  901.   successful DHCPDECLINEs to be logged as "not found" rather than
  902.   "abandoned".
  904. - Added configuration file examples for DHCPv6.
  906. - Some failover debugging #defines have been better defined and some
  907.   high frequency messages moved to a deeper debugging symbol.
  909. - The CLTT parameter in failover is now only updated by client activity,
  910.   and not by failover binding updates (taking on the peer's CLTT).
  912. - Failover BNDUPD messages are now discarded if they conflict with an
  913.   update that has been transmitted, but not acknowledged.
  915. - A bug cleaning up unknown-xxx temporary option definitions was fixed.
  917. - Delayed-ack is now a compile-time option, compiled out by default.
  918.   This feature is simply too experimental for right now, and causes
  919.   some problems to some failover installations.  We will revisit this
  920.   in future releases.
  922. - The !inet_pton() call in res_mkupdrec was adjusted to '<= 0' as
  923.   inet_pton returns either 1, 0, or -1.
  925. - A dhclient-script for MacOS X has been included, which enables
  926.   'dhclient -6' support.
  928.                         Changes since 4.1.0a1
  930. - Corrected list of failover state values in dhcpd man page.
  932. - Fixed a bug that caused some request types to be logged incorrectly.
  934. - Clients that sent a parameter request list containing the
  935.   routers option before the subnet mask option were receiving
  936.   only the latter.  Fixed.
  938. - The server wasn't always sending the FQDN option when it should.
  940. - A partner-down failover server no longer emits 'peer holds all free leases'
  941.   if it is able to newly-allocate one of the peer's leases.
  943. - Fixed a coredump when adding a class via OMAPI.
  945. - Check whether files are zero length before trying to parse them.
  947. - Ari Edelkind's PARANOIA patch has been included and may be compiled in
  948.   via two ./configure parameters, --enable-paranoia and
  949.   --enable-early-chroot.
  951. - ./configure was extended to cover many optional build features, such
  952.   as failover, server tracing, debugging, and the execute() command.
  954. - There is now a default 1/4 of a second scheduled delay between delayed
  955.   fsync()'s, it can be configured by the max-ack-delay configuration
  956.   parameter.
  958. - A bug was fixed where the length of a hostname was miscalculated, so that
  959.   hosts were given odd-looking domain names ("foo.bar.ba.example.com").
  961. - Shared network selection should be done from the innermost relay
  962.   valid link-address field, rather than the outermost.
  964. - Prefix pools are attached to shared network scopes.
  966. - Merged IA_XX related structures.
  968. - Add DHCPv6 files in configure.
  970. - A memory leak when using omapi has been fixed.
  972. - DHCPv6 vendor-class options (VSIO) are now only sent when they appear
  973.   on the DHCPv6 ORO.  This resolves a bug where VSIO options were placed
  974.   in IA_NA encapsulated options fields.
  976. - Integrated client with stateless, temporary address and prefix delegation
  977.   support.
  979. - A double-dereference in dhclient transmission of DHCPDECLINEs was
  980.   repaired.
  982. - Fix handling of format code 'Z'.
  984. - Support "-1" argument in DHCPv6.
  986. - Merge DHCPv6-only "dhcrelay6" into general-purpose "dhcrelay" (use
  987.   "-6" option to select DHCPv6 mode).
  989. - Fix handling of -A and -a flags in dhcrelay; it was failing to expand
  990.   packet size as needed to add relay agent options.
  992. - A bug in subnet6 parsing where options contained in subnet6 clauses would
  993.   not be applied to clients addressed within that network was repaired.
  995. - When configuring a "subnet {}" or "subnet6 {}" without an explicit
  996.   shared-network enclosing it, the DHCP software would synthesize a
  997.   shared-network to contain the subnet.  However, all configuration
  998.   parameters within the subnet more intuitively belong "to any client
  999.   on that interface", or rather the synthesized shared-network.  So,
  1000.   when a shared-network is synthesized, it is used to contain the
  1001.   configuration present inside the subnet {} clause.  This means that
  1002.   the configuration will be valid for all clients on that network, not
  1003.   just those addressed out of the stated subnet.  If you intended the
  1004.   opposite, the workaround is to explicitly configure an empty
  1005.   shared-network.
  1007. - A bug was fixed where Information-Request processing was not sourcing
  1008.   configured option values.
  1010. - A warning was added since the DHCPv6 processing software does not yet
  1011.   support class statements.
  1013. - Compliation warnings on GCC 4.3 relating to bootp source address
  1014.   selection were repaired.
  1016. - The v6 BSD socket method was updated to use a single UDP BSD socket
  1017.   no matter how many interfaces are involved, differentiating the
  1018.   interfaces the packets were received on by the interface index supplied
  1019.   by the OS.
  1021. - The relay agent no longer listens to the All DHCP Servers Multicast
  1022.   address.
  1024. - A bug was fixed in data_string_sprintfa() where va_start was only called
  1025.   once for two invocations of vsprintf() variants.
  1027. - ERO (RFC 4994) server support.
  1029. - Basic and partial DHCPv6 leasequery support.
  1031. - Reliable DHCPv6 release (previous behavior, send release and exit, is
  1032.   still available with dhclient -6 -1 -r).
  1034.                         Changes since 4.0.0 (new features)
  1036. - Added DHCPv6 rapid commit support.
  1038. - Added explicit parser support for zero-length DHCP options, such as
  1039.   rapid-commit, via format code 'Z'.
  1041. - It's now possible to update the "ends" field of a lease with OMAPI.
  1042.   This is useful if you want not only to release a lease, but also make
  1043.   it available for reuse right away.  Hat tip to Christof Chen.
  1045. - Fixed definition of the iaaddr hash functions to use the correct
  1046.   functions when referencing and dereferencing memory.
  1048. - Some definitions not in phase with the IANA registry were updated.
  1050. - Allocated interface IDs are better controlled ('u' bit set to zero,
  1051.   reserved IDs avoided).
  1053. - Unicast options are taken into account only for RENEWs.
  1055. - NoAddrsAvail answers to SOLICITs are always ADVERTISEs even when a SOLICIT
  1056.   carries a rapid-commit option.
  1058. - Return in place of raise an impossible condition when one tries to release
  1059.   an empty active lease.
  1061. - Timer granularity is now 1/100s in the DHCPv6 client.
  1063. - The dhclient-script was updated to create a host route for the default
  1064.   gateway if the supplied subnet mask for an IPv4 address was a /32.  This
  1065.   allows the client to work in 'captive' network environments, where the
  1066.   operator does not want clients to crosstalk directly.
  1068. - MINUS tokens should be parseable again.
  1070. - Multiple (up to "delayed-ack x;" maximum) DHCPv4 packets are now queued and
  1071.   released in bursts after single fsync() events when the upper limit is
  1072.   reached or if the receiving sockets go dry.  The practical upshot is
  1073.   that fsync-coupled server performance is now multiplicitively increased.
  1074.   The default delayed ack limit is 28.  Thanks entirely to a patch from
  1075.   Christof Chen.
  1077.                         Changes since 4.0.0 (bug fixes)
  1079. - DHCP now builds on AIX.
  1081. - Exit with warning when DHCPv6-specific statements are used in the
  1082.   config file but -6 is not specified.
  1084. - Fixed "--version" flag in dhcrelay
  1086. - The 'min-secs' configuration parameter's log message has been updated to
  1087.   be more helpful.
  1089. - The warning logged when an address range doesn't fit in the subnets
  1090.   they were declared has been updated to be more helpful and identify the
  1091.   typo in configuration that created the spanning addresses.
  1093. - A bug in failover pool rebalancing that caused POOLREQ message ping-pongs
  1094.   was repaired.
  1096. - A flaw in failover pool rebalancing that could cause POOLREQ messages to
  1097.   be sent outside of the min-balance/max-balance scheduled intervals has
  1098.   been repaired.
  1100. - A cosmetic bug during potential-conflict recovery that caused the peer's
  1101.   'conflict-done' state message to be logged as 'unknown-state' has been
  1102.   repaired.  It is now logged correctly.
  1104. - A bug was fixed where the 'giaddr' may be used to find the client's subnet
  1105.   rather than its own 'ciaddr'.
  1107. - A log message was introduced to clarify the situation where a failover
  1108.   'address' parameter (the server's local address) did not resolve to an
  1109.   IPv4 address.
  1111. - The minimum site code value was set to 224 in 3.1.0 to track RFC3942.  This
  1112.   broke a lot of legacy site local configurations.  The new code in place will
  1113.   track site local space minimum option codes and logs a warning to encourage
  1114.   updates and exploration of site local code migration problems.  Option
  1115.   codes less than 128 in site local spaces remain inaccessible.
  1117. - A possible relay agent option bug was repaired where random server
  1118.   initialization state may have been used to signal the relay agent
  1119.   information options sub-option code for the 'END' of the option space.
  1121. - Fixes to allow code to compile and run on Solaris 9.
  1123. - Fixes to allow code to compile on Mac OS X Leopard (10.5).
  1125. - When server is configured with options that it overrides, a warning is
  1126.   issued when the configuration file is read, rather than at the time the
  1127.   option is overridden. This was important, because the warning was given
  1128.   every time the option was overridden, which could create a lot of
  1129.   unnecessary logging.
  1131. - Fixed a compilation problems on platforms that define a value for FDDI,
  1132.   which conflicts with a dhcp configuration syntax token by the same name.
  1134. - When a failover server suspects it has encountered a peer running a
  1135.   version 3.0.x failover server, a warning that the failover wire protocol
  1136.   is incompatible is printed.
  1138. - The failover server no longer issues a floating point error if it encounters
  1139.   a previously undefined option code.
  1141. - Fix startup error messages to report a missing "subnet6 declaration", rather
  1142.   than a missing "subnet declaration", when running as a DHCPv6 server.
  1144. - DHCPv6 client timestamp in DUID was based on the year 1970 rather
  1145.   than the year 2000.
  1147. - Warn when attempting to use a hardware parameter in DHCPv6.
  1149. - DHCPv6 released resources are now marked as released by the client.
  1151. - 'Soft' bindings have no more side-effects.
  1153.                         Changes since 4.0.0b3
  1155. - The reverse dns name for PTR updates on IPv6 addresses has been fixed to
  1156.   use ip6.arpa. rather than default to in-addr.arpa and require user
  1157.   configuration.
  1159. - dhc6_lease_destroy() and dhc6_ia_destroy() now set lease and IA pointers
  1160.   to NULL after freeing, to prevent subsequent accesses to freed memory.
  1162. - The DHCPv6 server would not send the preference option unless the
  1163.   client requested it, via the ORO. This has been fixed, so the DHCPv6
  1164.   server will always send the preference value if it is configured.
  1166. - When addresses were passed as hints to the server in an IA, they were
  1167.   incorrectly handled, sometimes being treated as an error. Now the
  1168.   server will treat these as hints and ignore them if it cannot supply
  1169.   a requested address.
  1171. - If the client had multiple addresses, and one expired (was not renewed
  1172.   by the server), the client would continue to attempt to renew the same
  1173.   old address over and over.  Now, the client will omit any expired
  1174.   addresses from future Confirm, Renew, or Rebind messages.
  1176. - dhclient -6 will now select renew/rebind timers based upon the longest
  1177.   address expiration time rather than the shortest expiration time, in
  1178.   order to avoid cascading renewals in the event a server elects not to
  1179.   extend one of multiple IAADDR leases.
  1181. - The server now limits clients that request multiple addresses to one
  1182.   address per IA by default, which can be adjusted through the
  1183.   "limit-addrs-per-ia" configuration option.
  1185. - The DHCPv6 client now issues fresh transaction IDs on Renew and Rebind
  1186.   message exchanges, rather than using the most recent ID.
  1188. - The DHCPv6 server now replies to Information-Request messages.
  1190. - A bug was fixed in the dhclient-script for BSDs to correctly carry error
  1191.   codes through some conditions.
  1193. - The parsing of some options in the dhclient lease file, in particular
  1194.   the success DHCPv6 status-code, was fixed.
  1196. - A bug was fixed that caused the DHCPv6 ORO option to be corrupted with
  1197.   seemingly random values.
  1199. - A reference overleak in DHCPv6 shared network processing was repaired.
  1201. - ./configure now autodetects local database locations rather than trying
  1202.   to put dhcpd.leases and dhclient.leases in /usr/local/var/db, which no
  1203.   one ever has.
  1205. - Regression fix for bug where server advertised a IPv6 address in
  1206.   response to a SOLICIT but would not return the address in response
  1207.   to a REQUEST.
  1209. - A bug was fixed where the DHCPv6 server puts the NoAddrsAvail status
  1210.   code in the IA_NA was fixed.  The status code now appears in the root
  1211.   level.
  1213.                         Changes since 4.0.0b2
  1215. - Clarified error message when lease limit exceeded
  1217. - Relative time may now be used as a qualifier for 'allow' and 'deny' access
  1218.   control lists.  These directives may be used to assist in re-addressing
  1219.   address pools without having to constantly reconfigure the server.  Please
  1220.   see 'man dhcpd.conf' for more information on allow/deny 'after time' syntax.
  1221.   Thanks to a patch from Christof Chen.
  1223. - The server will now include multiple IA_NA's and multiple IAADDRs within
  1224.   them, if advertised by the client.  It still only seeks to allocate one
  1225.   new address.
  1227.                         Changes since 4.0.0b1
  1229. - Use different paths for PID and lease files when running in DHCPv4
  1230.   or DHCPv6 mode, so that servers for both protcols can be run
  1231.   simultaneously on a single interface.
  1233. - Fixed a buffer overflow error which could have allowed a denial
  1234.   of service under unusual server configurations
  1236. - Eliminated a spurious error message from the client
  1238. - A number of bugs with the internal handling of lease state on the
  1239.   server have been fixed. Some of these could cause server crashes.
  1241. - The peer_wants_leases() changes pulled up from 3.1.0 were corrected,
  1242.   'never used' leases will no longer consistently shift between servers
  1243.   on every pool rebalance run.
  1245. - sendmsg()/recvmsg() control buffers are now declared in such a way to
  1246.   ensure they are correctly aligned on all (esp. 64-bit) architectures.
  1248. - The client leasing subsystem was streamlined and corrected to account
  1249.   more closely for changes in client link attachment selection.
  1251.                         Changes since 4.0.0a3
  1253. - The DHCP server no longer requires a "ddns-update-style" statement,
  1254.   and now defaults to "none", which means DNS updates are disabled.
  1256. - Log messages when failover peer names mismatch have been improved to
  1257.   point out the problem.
  1259. - Bug where server advertised a IPv6 address in response to a SOLICIT
  1260.   but would not return the address in response to a REQUEST. Thanks to
  1261.   Dennis Kou for finding the bug.
  1263. - Fixed an error causing the server to lock up on lease expiration,
  1264.   reported independently by Jothilingam Vasu and Dennis Kou.
  1266. - Fixed a ./configure bug where compile tests were failing due to
  1267.   "-Werror" (unused variable) rather than the actual test failure.  Lead
  1268.   to inconsistent and unworkable auto-configurations.
  1270. - Compilation with DLPI and -Werror has been repaired.
  1272. - Error in decoding IA_NA option if multiple interfaces are present
  1273.   fixed by Marcus Goller.
  1275. - DHCPv6 server Confirm message processing has been enhanced - it no
  1276.   longer replies only to clients with host {} records, it now replies
  1277.   as directed in RFC3315 section 18.2.2 - that is, to all clients
  1278.   regardless of the existence of bindings.
  1280. - A core dump during expired lease cleanup has been repaired.
  1282. - DDNS updates state information are now stored in 'binding scopes' that
  1283.   follow the leases through their lifecycles.  This enables DDNS teardowns
  1284.   on leases that are assigned and expired inbetween a server restart (the
  1285.   state is recovered from dhcpd.leases).  Arbitrary user-specified binding
  1286.   scopes ('set var = "value";') are not yet supported.
  1288. - Additional compilation problems on HP/UX have been repaired.
  1290.                         Changes since 4.0.0a2
  1292. - Fix for startup where there are no IPv4 addresses on an interface.
  1293.   Thanks to Marcus Goller for reporting the bug.
  1295. - Fixed file descriptor leak on listen failure. Thanks to Tom Clark.
  1297. - Bug in server configuration parser caused server to get stuck on
  1298.   startup for certain bad pool declarations. Thanks to Guillaume
  1299.   Knispel for the bug report and fix.
  1301. - Code cleaned to remove warnings reported by "gcc -Wall".
  1303. - DHCPv6 is now the default. You can disable DHCPv6 support using the
  1304.   "--disable-dhcpv6" flag when you run the configure script.
  1306. - An internal database inconsistency bug was repaired where the server
  1307.   would segfault if a client attempted to renew a lease that had been
  1308.   loaded from persistent storage.
  1310. - 'request' and 'also request' syntaxes have been added to accommodate
  1311.   the DHCPv6 client configuration.  'send dhcp6.oro' is no longer
  1312.   necessary.
  1314. - Bug fixed where configuration file parsing did not work with
  1315.   zero-length options; this made it impossible to set the
  1316.   rapid-commit option.
  1318. - Bogus messages about host records with IPv4 fixed-addresses being of
  1319.   non-128-bits in length were removed.
  1321.                         Changes since 4.0.0a1
  1323. - Bug in octal parsing fixed. Thanks to Bernd Fuhrmann for the report
  1324.   and fix.
  1326. - Autoconf now supplies proper flags for Solaris DHCPv6 builds.
  1328. - Fix for parsing error on some IPv6 addresses.
  1330. - Invalid CIDR representation for IPv6 subnets or ranges now checked
  1331.   for when loading configuration.
  1333. - Compilation on HP/UX has been repaired.  The changes should generally
  1334.   apply to any architecture that supplies SIOCGLIFCONF but does not
  1335.   use 'struct lifconf' structures to pass values.
  1337. - Two new operators, ~= and ~~, have been integrated to implement
  1338.   boolean matches by regular expression (such as may be used in
  1339.   class matching statements).  Thanks to a patch by Alexandr S.
  1340.   Agranovsky, which underwent slight modification.
  1342. - Fix for icmp packets on 64-bit systems (bug introduced in 4.0).
  1344. - A bug was fixed in interface discovery wherein an error identifying
  1345.   a server-configured interface with no IPv4 addresses would SEGV.
  1347. - Fixed a bug in which write_lease() might report a failure incorrectly
  1349. - Added support for DHCPv6 Release messages
  1351. - Added -x option to dhclient, which triggers dhclient processes
  1352.   to exit gracefully without releasing leases first
  1354. - All binaries (client, server, relay) now change directories
  1355.   to / before going into daemon mode, so as not to hold $CWD open
  1357. - Fixed a bug parsing DHCPv6 client-id's in host-identifier statements
  1359. - Fixed a bug with the 'ddns-updates' boolean server configuration
  1360.   parameter, which caused the server to fail.
  1362.                         Changes since 4.0.0-20070413
  1364. - Old (expired) leases are now cleaned.
  1366. - IPv6 subnets now have support for arbitrary allocation ranges via
  1367.   a new 'range6' configuration directive.
  1369. - An obviated option code hash lookup to find D6O_CLIENTID was removed.
  1371. - Corrected some situations where variables might be used without being
  1372.   initialized.
  1374. - Silenced several other compiler warnings.
  1376. - Include the more standard sys/uio.h rather than rely upon other
  1377.   header files to include it (fixes a BSD 4.2 compile failure).
  1379. - Duplicate dhclient-script updates for DHCPv6 to all provided scripts.
  1381. - DHCPv4 I/O methods that failed to sense hardware address were corrected.
  1383. - DHCPv4 is now the default (as documented) rather than DHCPv6.  The default
  1384.   was set to DHCPv6 to facilitate ease early development, and forgotten.
  1386. - Corrected a segmentation violation in DHCPv4 socket processing.
  1388. - dhclient will now fork() into the background once it binds to an
  1389.   IPv6 address, or immediately if the -n flag is supplied.
  1391. - -q is now the default behaviour on dhclient, with -d or -v enabling
  1392.   non-quiet (stderr logging) mode.
  1394. - Fix documentation of the domain-search atom (quoted, with commas).
  1396. - Document DHCPv6 options presently in the default table.
  1398. - Replaced ./configure shellscripting with GNU Autoconf.
  1400.                      Changes since 3.1.0 (NEW FEATURES)
  1402. - DHCPv6 Client and Server protocol support.  Use '-6' to run the daemons
  1403.   as v6-only.  Use '-4' to run the daemons as v4-only (default.  There is
  1404.   no support currently for both.
  1406. - Server support for multiple IA_NA options, containing at most one
  1407.   IAADDR option.
  1409. - Client support for one IA_NA option, containing any number of IAADDR
  1410.   options.
  1412. - Server support for the DHCPv6 Information-request message.
  1414. - Inappropriate unicast DHCPv6 messages sent to the server are now
  1415.   discarded, and this has rearchitected the IO system slightly.
  1417. - The DHCPv6 server DUID defaults to type 1, is persistently stored in
  1418.   the leases database, and can be over-ridden (either completely, or by
  1419.   specifying type 1 or type 2).
  1421. - The server only uses Rapid-Commit if it has been configured with the
  1422.   Rapid-Commit option and the client requests it.
  1424. - DDNS support. We now update AAAA records in the same place we would
  1425.   update A records, if we have an IPv6 address. We also generate IP6.ARPA
  1426.   style names for PTR records if we're dealing with an IPv6 address.  Both
  1427.   A and AAAA updates are done using the same 'fqdn.' virtual option space
  1428.   (although the DHCPv4 FQDN and DHCPv6 FQDN options are formatted
  1429.   differently, they both use the same code here).
  1431. - The Linux dhclient-script attempts to set and remove assigned addresses,
  1432.   and to configure /etc/resolv.conf from nameserver and domain name
  1433.   configurations.  It can be extended to configure other parameters.
  1435. - Initial DHCPv6 lease support.
  1437. - The IO system now tracks all local IP addresses, so that the DHCP
  1438.   applications (particularly the dhcrelay) can discern between what frames
  1439.   were transmitted to it, and what frames are being carried through it which
  1440.   it should not intercept.
  1442.                         Changes since 3.1.0 (Maintenance)
  1444. - A bug was repaired where MAC Address Affinity for virgin leases always
  1445.   mapped to the primary.  Virgin leases now have an interleaved preference
  1446.   between primary and secondary.
  1448. - A bug was repaired where MAC Address Affinity for clients with no client
  1449.   identifier was sometimes mishashed to the peer.  Load balancing during
  1450.   runtime and pool rebalancing were opposing.
  1452. - An assertion in lease counting relating to reserved leases was repaired.
  1454. - The subnet-mask option inclusion now conforms with RFC2132 section 3.3;
  1455.   it will only appear prior to the routers option if it is present on the
  1456.   Parameter-Request-List.  The subnet-mask option will also only be
  1457.   included by default (if it is not on the PRL) in response to DISCOVER
  1458.   or REQUEST messages.
  1460. - The FQDN option is only supplied if the client supplied an FQDN option or
  1461.   if the FQDN option was explicitly requested on the PRL.
  1463. - Dynamic BOOTP leases are now load balanced in failover.
  1465.                         Changes since 3.1.0rc1
  1467. - The parse warning that 'deny dyanmic bootp;' must be configured for
  1468.   failover protected subnets was removed.
  1470.                         Changes since 3.1.0b2
  1472. - Failover rebalance events no longer play ping pong with round errors
  1473.   (moving leases between free and back to backup where there are an
  1474.   odd number of leases).
  1476. - The 'pool' log line has been split into two messages, one before the
  1477.   rebalance run, and one after.
  1479. - Any queued BNDACKs are transmitted before transmitting new BNDUPDs.
  1480.   This enforces the correct sequence of events for the remote server
  1481.   processing these messages.
  1483.                         Changes since 3.1.0b1
  1485. - Fixed a bug that caused OMAPI clients to freeze when opening lease
  1486.   objects.
  1488. - A new server config option "fqdn-reply" specifies whether the server
  1489.   should send out option 81 (FQDN).  Defaults to "on".  If set to "off",
  1490.   the FQDN option is not sent, even if the client requested it.  This is
  1491.   needed because some clients misbehave otherwise.  Thanks to Christof Chen
  1492.   at Allianz.
  1494. - Allow trace output files (-tf option) to be overwritten, rather than
  1495.   crashing dhcpd if the file already exists
  1497. - A bug was fixed that caused dhcpd to segfault if a pool was declared
  1498.   outside the scope of a subnet in dhcpd.conf.
  1500. - Some uninitialized values were repaired in dhcpleasequery.c that
  1501.   caused the server to abort.
  1503. - A new server config option, 'do-reverse-updates', has been added
  1504.   which causes the server to abstain from performing updates on PTR
  1505.   records.  Thanks to a patch from Christof Chen at Allianz.
  1507. - A bug was repaired in subencapsulation support, where spaces separated
  1508.   by empty spaces would not get included.
  1510. - A bug in dhclient was repaired which caused it to send parameter request
  1511.   lists of 55 bytes in length no matter how long the declared PRL was.
  1513. - 'dhcp.c(3953): non-null pointer' has been repaired.  This fixes a flaw
  1514.   wherein the DHCPv4 server may ignore a configured server-identifier.
  1516. - A flaw in failover startup sequences was repaired that sometimes left
  1517.   the primary DHCP server's pool rebalance schedules unscheduled.
  1519. - Corrected a flaw that broke encapsulated spaces included due to presence
  1520.   on the parameter request list.
  1522.                         Changes since 3.1.0a3
  1524. - Some spelling fixes.
  1526.                         Changes since 3.1.0a2
  1528. - A bug was fixed where attempting to permit leasequeries results in a
  1529.   fatal internal error, "Unable to find server option 49".
  1531. - A bug was fixed in dhclient rendering the textual output form of the
  1532.   domain-search option syntax.
  1534.                         Changes since 3.1.0a1
  1536. - A bug in the FQDN universe that added FQDN codes to the NWIP universe's
  1537.   hash table was repaired.
  1539. - The servers now try harder to transmit pending binding updates when
  1540.   entering normal state.
  1542. - UPDREQ/UPDREQALL handling was optimized - it no longer dequeues and
  1543.   requeues all pending updates.  This should reduce the number of spurious
  1544.   'xid mismatch' log messages.
  1546. - An option definition referencing leak was fixed, which resulted in early
  1547.   termination of dhclient upon the renewal event.
  1549. - Some default hash table sizes were tweaked, some upwards, some downwards.
  1550.   3.1.0a1's tables resulted in a reduction in default server memory use.
  1551.   The new selected values provide more of a zero sum (increasing the size
  1552.   of tables likely to be populated, decreasing the size of tables unlikely).
  1554. - Lease structures appear in three separate hashes: by IP address, by UID,
  1555.   and by hardware address.  One type of table was used for all three, and
  1556.   improvements to IP address hashing were applied to all three (so UID and
  1557.   hardware addresses were treated like 4-byte integers).  There are now two
  1558.   types of tables, and the uid/hw hashes use functions more appropriate
  1559.   to their needs.
  1561. - The max-lease-misbalance percentage no longer causes scheduled rebalance
  1562.   runs to be skipped: it still governs the schedule, but every scheduled
  1563.   run will attempt balance.
  1565. - A segfault bug in recursive encapsulation support has been corrected.
  1567.                         Changes since 3.0 (New Features)
  1569. - A workaround for certain STSN servers that send a mangled domain-name
  1570.   option was introduced for dhclient.  The client will now accept corrupted
  1571.   server responses, if they contain a valid DHCP_MESSAGE_TYPE (OFFER, ACK,
  1572.   or NAK).  The server will continue to not accept corrupt client packets.
  1574. - Support for 'reserved' (pseudo-static) and BOOTP leases via failover
  1575.   was introduced.
  1577. - Support for adding, removing, and managing class and subclass statements
  1578.   via OMAPI.
  1580. - The failover implementation was updated to comply with revision 12 of
  1581.   the protocol draft.
  1583. - 'make install' now creates the initial zero-length dhcpd.leases file if
  1584.   one does not already exist on the system.
  1586. - RFC3942 compliance, site-local option spaces start at 224 now, not 128.
  1588. - The Load Balance Algorithm was misimplemented.  The current implementation
  1589.   matches RFC 3074.
  1591. - lcase() and ucase() configuration expressions have been added which adjust
  1592.   their arguments from upper to lower and lower to upper cases respectively.
  1593.   Thanks to a patch from Albert Herranz.
  1595. - The dhclient 'reject ...;' statement, which rejects leases given by named
  1596.   server-identifiers, now permits address ranges to be specified in CIDR
  1597.   notation.  Thanks to a patch from David Boyce.
  1599. - The subnet-mask option is now supplied by default, but at lowest
  1600.   priority.  This helps a small minority of clients that provide parameter
  1601.   request lists, but do not list the subnet-mask option because they were
  1602.   designed to interoperate with a server that behaves in this manner.
  1604. - The FQDN option is similarly supplied even if it does not appear on the
  1605.   parameter request list, but not to the exclusion of options that do
  1606.   appear at the parameter request list.  Up until now it had ultimate
  1607.   priority over the client's parameter request list.
  1609. - Varying option space code and length bit widths (8/16/32) are now
  1610.   supported.  This is a milestone in achieving RFC 3925 "VIVSO" and
  1611.   DHCPv6 support.
  1613. - A new common (server or client) option, 'db-time-format local;', has
  1614.   been added which prints the local time in /var/db/dhcpd.leases rather
  1615.   than UTC.  Thanks to a patch from Ken Lalonde.
  1617. - Some patches to improve DHCP Server startup speed from Andrew Matheson
  1618.   have been incorporated.
  1620. - Failover pairs now implement 'MAC Affinity' on leases moving from the
  1621.   active to free states.  Leases that belonged to the failover secondary
  1622.   are moved to BACKUP state rather than FREE upon exiting EXPIRED state.
  1623.   If lease rebalancing must move leases, it tries first to move leases
  1624.   that belong to the peer in need.
  1626. - The server no longer sends POOLREQ messages unless the pool is severely
  1627.   misbalanced in the peer's favor (see 'man dhcpd.conf' for more details).
  1629. - Pool rebalance events no longer happen upon successfully allocating a
  1630.   lease.  Instead, they happen on a schedule.  See 'man dhcpd.conf' for the
  1631.   min-balance and max-balance statements for more information.
  1633. - The DHCP Relay Agent Information Option / Link Selection Sub-Option
  1634.   is now supported.  (See RFC3527 for details).
  1636. - A new DDNS related server option, update-conflict-detection, has been
  1637.   added.  If this option is enabled, dhcpd will perform normal DHCID
  1638.   conflict resolution (the default).  If this option is disabled, it will
  1639.   instead trust the assigned name implicitly (removing any other bindings
  1640.   on that name).  This option has not been made available in dhclient.
  1642. - In those cases where the DHCP software manufactures an IP header (to
  1643.   transmit via bpf, lpf, etc), the IP TTL the software selects has been
  1644.   increased from 16 to 128.  This is intended to match Microsoft Windows
  1645.   DHCP Client behaviour, to increase compatibility.
  1647. - 'ignore client-updates;' now has behaviour that is different from
  1648.   'deny client-updates;'.  The client's request is not truly ignored,
  1649.   rather it is encouraged.  Should this value be configured, the server
  1650.   updates DNS as though client-updates were set to 'deny'.  That is, it
  1651.   enters into DNS whatever it is configured to do already, provided it is
  1652.   configured to.  Then it sends a response to the client that lets the
  1653.   client believe it is performing client updates (which it will), probably
  1654.   for a different name.  In essence, this lets the client do as it will,
  1655.   ignoring this aspect of their request.
  1657. - Support for compressed 'domain name list' style DHCP option contents, and
  1658.   in particular the domain search option (#119) was added.
  1660. - The DHCP LEASEQUERY protocol as defined in RFC4388 is now implemented.
  1661.   LEASEQUERY lets you query the DHCP server for information about a lease,
  1662.   using either an IP address, MAC address, or client identifier.  Thanks
  1663.   to a patch from Justin Haddad.
  1665. - DHCPD is now RFC2131 section 4.1 compliant (broadcast to all-ones ip and
  1666.   ethernet mac address) on the SCO platform specifically without any strange
  1667.   ifconfig hacks.  Many thanks go to the Kroger Co. for donating the
  1668.   hardware and funding the development.
  1670. - A new common configuration executable statement, execute(), has been
  1671.   added.  This permits dhcpd or dhclient to execute a named external
  1672.   program with command line arguments specified from other configuration
  1673.   language.  Thanks to a patch written by Mattias Ronnblom, gotten to us
  1674.   via Robin Breathe.
  1676. - A new dhcp server option 'adaptive-lease-time-threshold' has been added
  1677.   which causes the server to substantially reduce lease-times if there are
  1678.   few (configured percentage) remaining leases.  Thanks to a patch submitted
  1679.   from Christof Chen.
  1681. - Encapsulated option spaces within encapsulated option spaces is now
  1682.   formally supported.
  1684.                         Changes since 3.0.6rc1
  1686. - supersede_lease() now requeues leases in their respective hardware
  1687.   address hash bucket.  This mirrors client identifier behaviour.
  1689.                         Changes since 3.0.5
  1691. - Assorted fixes for broken network devices:  Packet length is now
  1692.   determined from the IP header length field to finally calculate the
  1693.   UDP payload length, because some NIC drivers return more data than
  1694.   they actually received.
  1696. - UDP packets are now stored in aligned data structures.
  1698. - A logic error in omapi interface code was repaired that might result in
  1699.   incorrectly indicating 'up' state when any flags were set, rather than
  1700.   specifically the INTERFACE_REQUESTED flag.  Thanks to a patch from
  1701.   Jochen Voss which got to us via Andrew Pollock at Debian.
  1703. - A reference leak on binding scopes set by ddns updates was repaired.
  1705. - A memory leak in the minires_nsendsigned() function call was repaired.
  1706.   Effectively, this leaked ~176 bytes per DDNS update.
  1708. - In the case where an "L2" DHCP Relay Agent (one that does not set giaddr)
  1709.   was directly attached to the same broadcast domain as the DHCP server,
  1710.   the RFC3046 relay agent information option was not being returned to the
  1711.   relay in the server's replies.  This was fixed; the dhcp server no longer
  1712.   requires the giaddr to reply with relay agent information.  Note that
  1713.   this also improves compatibility with L2 devices that "intercept" DHCP
  1714.   packets and expect relay agent information even in unicast (renewal)
  1715.   replies.  Thanks to a patch from Pekka Silvonen.
  1717. - A bug was fixed where the BOOTP header 'sname' field had a value, the
  1718.   copy written to persistent storage was actually the contents of the
  1719.   'file' field.
  1721. - A bug was fixed where the nwip virtual option space was referencing
  1722.   the fqdn option's virtual option space's option cache.
  1724. - Timestamp parsing errors that indicated missing "minutes" fields rather
  1725.   than the actually missing "seconds" fields have been repaired thanks to
  1726.   a patch from Kevin Steves.
  1728. - A grammar error in the dhclient.8 manpage was repaired thanks to a patch
  1729.   from Chris Wagner.
  1731. - Several spelling typos were repaired, and some cross-references to other
  1732.   relevant documents were included in the manpages, thanks to a patch
  1733.   by Andrew Pollock which got to us via Tomas Pospisek.
  1735. - Some bugs were fixed in the 'emergency relay agent options hologram'
  1736.   which is used to retain relay agent option contents from when the
  1737.   client was in INIT or REBIND states.  This should solve problems where
  1738.   relay agent options were not echoed from the server, even when giaddr
  1739.   was set.
  1741. - dhclient now closes its descriptor to dhclient.leases prior to executing
  1742.   dhclient-script.  Thanks to a patch from Tomas Pospisek.
  1744. - The server's "by client-id" and "by hardware address" hash table lists
  1745.   are now sorted according to the preference to re-allocate that lease to
  1746.   returning clients.  This should eliminate pool starvation problems
  1747.   arising when "INIT" clients were given new leases rather than presently
  1748.   active ones.
  1750.                         Changes since 3.0.5rc1
  1752. - A bug was repaired in fixes to the dhclient, which sought to run the
  1753.   dhclient-script with the 'EXPIRE' state should it receive a NAK in
  1754.   response to a REQUEST.  The client now iterates the PREINIT state
  1755.   after the EXPIRE state, so that interfaces that might be configured
  1756.   'down' can be brought back 'up' and initialized.
  1758. - DHCPINFORM handling for clients that properly set ciaddr and come to the
  1759.   server via a relay aget has been repaired.
  1761.                         Changes since 3.0.4
  1763. - A warning that host statements declared within subnet or shared-network
  1764.   scopes are actually global has been added.
  1766. - The default minimum lease time (if min-lease-time was not specified)
  1767.   was raised from 0 to 300.  0 is not thought to be sensible, and is
  1768.   known to be damaging.
  1770. - Added additional fatal error sanity checks surrounding lease binding
  1771.   state count calculations (free/active counts used for failover pool
  1772.   balancing).
  1774. - Some time value size fixes in 3.0.4 brought on from FreeBSD /usr/ports were
  1775.   misapplied to server values rather than client values.  The server no longer
  1776.   advertises 8-byte lease-time options when on 64-bit platforms.
  1778. - A bug where leases not in ACTIVE state would get billed to billed classes
  1779.   (classes with lease limitations) was fixed.  Non-active leases OFFERed
  1780.   to clients are no longer billed (but billing is checked before offering).
  1782. - The dhcpd.conf.5 manpage was updated in regard to the ddns-domainname
  1783.   configuration option - the default configuration and results should be
  1784.   more clear now.
  1786. - If the dhclient were to receive a DHCPNAK while it was in the RENEW
  1787.   state (and consequently, had an active, 'bound' address and related
  1788.   configuration options), it would fail to 'tear down' this information
  1789.   before proceeding into INIT state.  dhclient now iterates the dhclient-
  1790.   script with the 'EXPIRE' action to cause these teardowns prior to entering
  1791.   INIT state.  Thanks to a patch from Chris Zimmerman.
  1793. - The omapi.1 manpage had some formatting errors repaired thanks to a patch
  1794.   from Yoshihiko Sarumaru.
  1796. - A few lines of code that were failover-specific were moved within
  1797.   #if defined() clauses so that compilation without failover could be
  1798.   made possible.
  1800. - The log message emitted when the 'leased-address' value was not available
  1801.   in dhcpd.conf "executable statements" has been updated to be more helpful.
  1802.   Manpage information for this value has also been updated.
  1804. - Abandoned or dissociated (err condition) leases now remove any related
  1805.   dynamic dns bindings.  Thanks to a patch from Patrick Schoo.
  1807. - Attempting to write a new lease file to replace a corrupt (due to
  1808.   encountering non-retryable errors during writing) lease file should
  1809.   no longer result in an infinite recursion.
  1811. - Host declaration hardware addresses and client identifiers may only be
  1812.   configured once.  dhcpd will now fail to load config files that specify
  1813.   multiple identifiers (previous versions would silently over-ride the
  1814.   value with the later configured value).
  1816. - Several option codes that have been allocated since our last release
  1817.   have been named and documented.
  1819. - Option names of the form "unknown-123" have been removed from the in-
  1820.   memory hash tables.  In order to support options of these names that
  1821.   may appear in dhclient.leases or similar in previous versions, the
  1822.   parser will now find the new option code definition, or mock up a
  1823.   generic option code definition.  This should result in a smooth
  1824.   transition from one name to the other, as the new name is used to
  1825.   write new output.
  1827.                         Changes since 3.0.4rc1
  1829. - The dhcp-options.5 manpage was updated to correct indentation errors
  1830.   thanks to a patch from Jean Delvare.
  1832.                         Changes since 3.0.4b3
  1834. - Some manual pages were clarified pursuant to discussion on the dhcp-server
  1835.   mailing list.
  1837.                         Changes since 3.0.4b2
  1839. - Null-termination sensing for certain clients that unfortunately require
  1840.   it in DHCPINFORM processing was repaired.
  1842. - The host-name option and a few others were moved from "X" format to "t"
  1843.   format to be compatible with new NULL handling functions.
  1845. - DHCPINFORM processing is a little more careful about return addressing
  1846.   its responses, or if responding via a relay.  The INFORM related
  1847.   messages also log the 'effective client ip address' rather than the
  1848.   client's supplied ciaddr (since some clients produce null ciaddrs).
  1850. - The server was inappropriately sending leases to the RESET state in the
  1851.   event that multiple active leases were found to match a singly-identified
  1852.   client.  This was changed to RELEASED (by accepting a different, ACTIVE
  1853.   binding, the client is implicitly releasing its lease).  This repairs a
  1854.   bug wherein secondary servers in failover pairs detecting this condition
  1855.   move leases to RESET, and primaries refuse to accept that state
  1856.   transition (properly).
  1858. - The memset-after-dmalloc() changes made in 3.0.4b1 have been backed out.
  1860.                         Changes since 3.0.4b1
  1862. - Command line parsing in omshell was repaired - it no longer closes
  1863.   STDIN after reading one line.
  1865. - The resolver library no longer closes the /etc/resolv.conf file
  1866.   descriptor it opened twice.
  1868. - Changes to trailing NULL removal in 't' option-atoms has been rethought,
  1869.   it now includes 'd' (domain name) types, and tries hard not to rewind an
  1870.   option beyond the start of the text field it is un-terminating.
  1872.                         Changes since 3.0.3
  1874. - A DDNS update handling function was misusing the DNS error codes, rather
  1875.   than the internal generic result enumeration.  The result is a confusing
  1876.   syslog line, logging the wrong condition.
  1878. - The DHCP Server was not checking pool balance in the case where it brought
  1879.   a non-ACTIVE lease out of storage for a client that was returning to use
  1880.   a lease it once had long ago, and had since expired.
  1882. - Failover peers no longer bother to look for free leases to allocate when
  1883.   they already found the client's ACTIVE lease.  DISCOVERs are load balanced
  1884.   whether freely-allocated or not, unless the server doubts the peer has
  1885.   leases to allocate.
  1887. - Fixed a bug in dhcrelay agent addition code that suppressed trailing
  1888.   PAD options - it was suppressing only one trailing PAD option, rather
  1889.   than the entire block of them.
  1891. ! Fixed some unlikely overlapping-region memcpy() bugs in dhcrelay agent
  1892.   option addition and stripping code.  Added a few sanity checks.  Although
  1893.   highly improbable, due to requiring the reception of a DHCP datagram well
  1894.   in excess of all known to be used physical MTU limitations, it is possible
  1895.   this may have been used in a stack overflow security vulnerability.  Thanks
  1896.   to a patch from infamous42md.
  1898. ! Added some sanity checks to OMAPI connection/authentication code.
  1899.   Although highly improbable, due to having to deliver in excess of 2^32
  1900.   bytes of data via the OMAPI channel, not to mention requiring dhcpd to
  1901.   be able to malloc() a memory region 2^32 bytes in size, it was possible
  1902.   this might have resulted in a heap overflow security vulnerability.
  1903.   Thanks to a patch from infamous42md.
  1905. - dmalloc() memset()'s the non-debug (data) portion of the allocated
  1906.   memory to zero.  Code that memset()'s the result returned by dmalloc() to
  1907.   zero is redundant.  These redundancies were removed.
  1909. - Some type declaration corrections to u_int16_t were made in common/tr.c
  1910.   (Token Ring support) thanks to a patch from Jason Vas Dias at Red Hat.
  1912. - A failover bug that was allowing leases that EXPIRED or were RELEASED
  1913.   where tsfp and tstp are identical timestamps to languish in these
  1914.   transitional states has been repaired.  As a side effect, lease
  1915.   databases should be kept more consistent overall, not just for these
  1916.   transitional states.
  1918. - If the lease db is deleted out from under the daemon, and it moves to rewrite
  1919.   the db, it will go ahead with the operation and move the new db into place
  1920.   once it detects the old db does not exist.
  1922. - dhclient now ignores IRDA, SIT, and IEEE1394 network interfaces, as it
  1923.   is either nonsensical or (in the case of IEEE1394) is not known to support
  1924.   these interfaces.  Thanks to Marius Gedminas and Andrew Pollock of Debian.
  1926. - Some previously undocumented reasons for dhclient-script invoking has
  1927.   been documented in the dhclient-script.8 manpage.
  1929. - Failover potential expiry calculations (TSTP) have been corrected.  Results
  1930.   should be substantially more consistent, and proper given the constraints.
  1932. - Adjusted lease state validation checks in potential-conflict, to
  1933.   account for possible clock skew similarly to normal state, and several
  1934.   previously illegal transitions were made legal (ex: active->released).
  1936. - An impossible sanity check was removed from omapi/buffer.c, thanks to a
  1937.   patch from 'infamous42md'.
  1939. - An OMAPI host/network byte order problem in lease time values has been
  1940.   repaired.
  1942. - Several minor bugs, largely relating to treating 8-byte time values as
  1943.   4-byte entities, have been repaired after careful review of the FreeBSD
  1944.   ports collection's patch set.  Thanks to the nameless entities who have
  1945.   contributed to the FreeBSD ports.
  1947. - When writing a trace file, the file is now created with permissions 0600,
  1948.   to help administrators avoid accidentally publicising sensitive config
  1949.   data.
  1951. - The calculation of the maximum size of DHCP packets no longer includes
  1952.   Ethernet framing overhead.  The result is that the 'Maximum Message
  1953.   Size' option advertised by clients, or the default value 576, is no
  1954.   longer reduced by 14 bytes, and instead directly reflects the IP level
  1955.   MTU (and the default, minimum allowed IP MTU of 576).
  1957. - The special status of RELEASED/EXPIRED/RESET leases when a server
  1958.   is operating in partner-down was fixed.  It no longer requires a
  1959.   lease be twice the MCLT beyond STOS to 'reallocate', and the expiry
  1960.   event to turn these into FREE leases without peer acknowledgement
  1961.   (after STOS+MCLT) has been repaired.
  1963. - Compilation on older Solaris systems (lacking /usr/include/sys/int_types.h)
  1964.   has been repaired.
  1966. - "append"ing a string onto the end of a "t" type option (such as the
  1967.   domain-name field) that had been improperly NULL-terminated by the
  1968.   DHCP server will no longer result in a truncated string containing
  1969.   only the option from the server, and not the expected appended value.
  1970.   Thanks to a patch from Jason Vas Dias at Red Hat.
  1972. - File handlers on configuration state (config files and lease dbs) should
  1973.   be treated consistently, regardless of whether TRACING is defined or not.
  1975. - The Linux build environment has had some minor improvements - better
  1976.   sensing of 64-bit pointer sizes (only used for establishing an icmp_id),
  1977.   and corrections to #if operators regarding LINUX_MAJOR should it ever
  1978.   move to 3.[01].x.
  1980. - The server now tries harder to survive the condition where it is unable
  1981.   to open a new lease file to rewrite the lease state database.
  1983.                         Changes since 3.0.3b3
  1985. - dhclient.conf documentation for interface {} was updated to reflect recent
  1986.   discussion on the dhcp-hackers mailing list.
  1988. - In response to reports that the software does not compile on GCC 4.0.0,
  1989.   -Werror was removed from Makefile.conf for all platforms that used it.
  1990.   We will address the true problem in a future release; this is a temporary
  1991.   workaround.
  1993.                         Changes since 3.0.3b2
  1995. - An error in code changes introduced in 3.0.3b2 was corrected, which caused
  1996.   static BOOTP clients to receive random addresses.
  1998.                         Changes since 3.0.3b1
  2000. - A bug was fixed in BOOTPREQUEST handling code wherein stale references to
  2001.   host records would be left behind on leases that were not allocated to the
  2002.   client currently booting (eg in the case where the host was denied booting).
  2004. - The dhcpd.conf.5 manpage was updated to be more clear in regards to
  2005.   multiple host declarations (thanks to Vincent McIntyre).  'Interim' style
  2006.   dynamic updates were also retouched.
  2008.                         Changes since 3.0.2
  2010. - A bug was fixed where a server might load balance a DHCP REQUEST to its
  2011.   peer after already choosing not to load balance the preceding DISCOVER.
  2012.   The peer cannot allocate the originating server's lease.
  2014. - In the case where a secondary server lost its stable storage while the
  2015.   primary was still in communications-interrupted, and came back online,
  2016.   the lease databases would not be fully transferred to the secondary.
  2017.   This was due to the secondary errantly sending an extra UPDREQ message
  2018.   when the primary made its state transition to PARTNER-DOWN known.
  2020. - The package will now compile cleanly in gcc 3.3 and 3.4.  As a side effect,
  2021.   lease structures will be 9 bytes smaller on all platforms.  Thanks to
  2022.   Jason Vas Dias at Red Hat.
  2024. - Interface discovery code in DISCOVER_UNCONFIGURED mode is now
  2025.   properly restricted to only detecting broadcast interfaces.  Thanks
  2026.   to a patch from Jason Vas Dias at Red Hat.
  2028. - decode_udp_ip_header was changed so that the IP address was copied out
  2029.   to a variable, rather than referenced by a pointer.  This enforces 4-byte
  2030.   alignment of the 32-bit IP address value.  Thanks to a patch from Dr.
  2031.   Peter Poeml.
  2033. - An incorrect log message was corrected thanks to a patch from
  2034.   Dr. Peter Poeml.
  2036. - A bug in DDNS was repaired, where if the server's first DDNS action was
  2037.   a DDNS removal rather than a DDNS update, the resolver library's
  2038.   retransmit timer and retry timer was set to the default, implying a
  2039.   15 second timeout interval.  Which is a little excessive in a synchronous,
  2040.   single-threaded system.  In all cases, ISC DHCP should now hold fast to
  2041.   a 1-second timeout, trying only once.
  2043. - The siaddr field was being improperly set to the server-identifier when
  2044.   responding to DHCP messages.  RFC2131 clarified the siaddr field as
  2045.   meaning the 'next server in the bootstrap process', eg a tftp server.
  2046.   The siaddr field is now left zeroed unless next-server is configured.
  2048. - mockup_lease() could have returned in an error condition (or in the
  2049.   condition where no fixed-address was found matching the shared
  2050.   network) with stale references to a host record.  This is probably not
  2051.   a memory leak since host records generally never die anyway.
  2053. - A bug was repaired where failover servers would let stale client identifiers
  2054.   persist on leases that were reallocated to new clients not sending an id.
  2056. - Binding scopes ("set var = value;") are now removed from leases allocated
  2057.   by failover peers if the lease had expired.  This should help reduce the
  2058.   number of stale binding scopes on leases.
  2060. - A small memory leak was closed involving client identifiers larger than
  2061.   7 bytes, and failover.
  2063. - Configuring a subnet in dhcpd.conf with a subnet mask of 32 bits might
  2064.   cause an internal function to overflow heap.  Thanks to Jason Vas Dias
  2065.   at Red Hat.
  2067. - Some inconsistencies in treating numbers that the lexer parsed as 'NUMBER'
  2068.   or 'NUMBER_OR_NAME' was repaired.  Hexadecimal parsing is affected, and
  2069.   should work better.
  2071. - In several cases, parse warnings were being issued before the lexical
  2072.   token had been advanced to the token whose value was causing an error...
  2073.   causing parse warnings to claim the problem is on the wrong token.
  2075. - Host declarations matching on client identifier for dynamic leases will
  2076.   no longer match fixed-address host declarations (this is now identical
  2077.   to behaviour for host records matching on hardware address).
  2079.                         Changes since 3.0.2rc3
  2081. - A previously undocumented configuration directive, 'local-address',
  2082.   was documented in the dhcpd.conf manpage.
  2084.                         Changes since 3.0.2rc2
  2086. - Two variables introduced in 3.0.2b1 were used without being initialized
  2087.   in the case where neither the FILE nor SNAME fields were available for
  2088.   overloading.  This was repaired.
  2090. - A heretofore believed to be impossible corner case of the option
  2091.   overloading implementation turned out to be possible ("Unable to sort
  2092.   overloaded options after 10 tries.").  The implementation was reworked
  2093.   to consider the case of an option so large it would require more than
  2094.   three chunks to fit.
  2096. - Many other instances of variables being used without being initialized
  2097.   were repaired.
  2099. - An uninitialized variable in omapi_io_destroy() led to the discovery
  2100.   that this function may result in orphaned pointers (and hence, a memory
  2101.   leak).
  2103.                         Changes since 3.0.2rc1
  2105. - allocate_lease() was rewritten to repair a bug in which the server would
  2106.   try to allocate an ABANDONED lease when FREE leases were available.
  2108.                         Changes since 3.0.2b1
  2110. - Some dhcp-eval.5 manpage formatting was repaired.
  2112.                         Changes since 3.0.1
  2114. - A bug was fixed in the server's 'option overloading' implementation,
  2115.   where options loaded into the 'file' and 'sname' packet fields were
  2116.   not aligned precisely as rfc2131 dictates.
  2118. - The FreeBSD client script was changed to support the case where a domain
  2119.   name was not provided by the server.
  2121. - A memory leak in 'omshell' per each command line parsed was
  2122.   repaired, thanks to a patch from Jarkko Torppa.
  2124. - Log functions writing to stderr were adjusted to use the STDERR_FILENO
  2125.   system definition rather than '2'.  This is a no-op for 90% of platforms.
  2127. - One call to trace_write_packet_iov() counted the number of io vectors
  2128.   incorrectly, causing inconsistent tracefiles.  This was fixed.
  2130. - Some expression parse failure memory leaks were closed.
  2132. - A host byte order problem in tracefiles was repaired.
  2134. - Pools configured in DHCPD for failover possessing permission lists that
  2135.   previously were assumed to not include dyanmic bootp clients are now
  2136.   a little more pessimistic.  The result is, dhcpd will nag you about just
  2137.   about most pools that possess a 'allow' statement with no 'deny' that
  2138.   would definitely match a dynamic bootp client.
  2140. - The 'ddns-update-style' configuration warning bit now insists that
  2141.   the configuration be globally scoped.
  2143. - Two memory leaks in dhclient were closed thanks to a patch from Felix
  2144.   Farkas.
  2146. - Some minor but excellently pedantic documentation errors were fixed
  2147.   thanks to a patch from Thomas Klausner.
  2149. - Bugs in operator precedence in executable statements have been repaired
  2150.   once again.  More legal syntaxes should be parsed legally.
  2152. - Failing to initialize a tracefile for any reason if a tracefile was
  2153.   specified is now a fatal error.  Thanks to a patch from Albert Herranz.
  2155. - Corrected a bug in which the number of leases transferred as calculated
  2156.   by the failover primary and sent to peers in POOLRESP responses may be
  2157.   incorrect.  This value is not believed to be used by other failover
  2158.   implementations, excepting perhaps as logged information.
  2160. - Corrected a bug in which 'dhcp_failover_send_poolresp()' was in fact
  2161.   sending POOLREQ messages instead of POOLRESP mesasges.  This message
  2162.   was essentially ignored since failover secondaries effectively do not
  2163.   respond to POOLREQ messages.
  2165. - Type definitions for various bitwidths of integers in the sunos5-5
  2166.   build of ISC DHCP have been fixed.  It should compile and run more
  2167.   easily when built in 64-bit for this platform.
  2169. - "allow known-clients;" is now a legal syntax, to avoid confusion.
  2171. - If one dhcp server chooses to 'load balance' a request to its failover
  2172.   peer, it first checks to see if it believes said peer has a free
  2173.   lease to allocate before ignoring the DISCOVER.
  2175. - log() was logging a work buffer, rather than the value returned by
  2176.   executing the statements configured by the user.  In some cases,
  2177.   the work buffer and the intended results were the same.  In some other
  2178.   cases, they were not.  This was fixed thanks to a patch from Gunnar
  2179.   Fjone and directconnect.no.
  2181. - Compiler warnings for some string type conversions was fixed, thanks
  2182.   to Andreas Gustafsson.
  2184. - The netbsd build environments were simplified to one, in which
  2185.   -Wconversion is not used, thanks to Andreas Gustafsson.
  2187. - How randomness in the backoff-cutoff dhclient configuration variable
  2188.   is implemented was better documented in the manpage, and the behaviour
  2189.   of dhclient in REQUEST timeout handling was changed to match that of
  2190.   DISCOVER timeout handling.
  2192. - Omapi was hardened against clients that pass in null values, thanks
  2193.   to a patch from Mark Jason Dominus.
  2195. - A bug was fixed in dhclient that kept it from doing client-side
  2196.   ddns updates.  Thanks to a patch from Andreas Gustafsson, which
  2197.   underwent some modification after review by Jason Vas Dias.
  2199. - Failover implementations disconnected due to the network between
  2200.   them (rather than one of the two shutting down) will now try to
  2201.   re-establish the failover connection every 5 seconds, rather than
  2202.   to simply try once and give up until one of them is restarted.
  2203.   Thanks to a patch from Ulf Ekberg from Infoblox, and field testing
  2204.   by Greger V. Teigre which led to an enhancement to it.
  2206. - A problem that kept DHCP Failover secondaries from tearing down
  2207.   ddns records was repaired.  Thanks to a patch from Ulf Ekberg from
  2208.   Infoblox.
  2210. - 64bit pointer sizes are detected properly on FreeBSD now.
  2212. - A bug was repaired where the DHCP server would leave stale references
  2213.   to host records on leases it once thought about offering to certain
  2214.   clients.  The result would be to apply host and 'known' scopes to the
  2215.   wrong clients (possibly denying booting).  NOTE:  The 'mis-host' patch
  2216.   that was being circulated as a workaround is not the way this bug was
  2217.   fixed.  If you were a victim of this bug in 3.0.1, you are cautioned
  2218.   to proceed carefully and see if it fixes your problem.
  2220. - A bug was repaired in the server's DHCPINFORM handling, where it
  2221.   tried to divine the client's address from the source packet and
  2222.   would get it wrong.  Thanks to Anshuman Singh Rawat.
  2224. - A log message was introduced to help illuminate the case where the
  2225.   server was unable to find a lease to assign to any BOOTP client.
  2226.   Thanks to Daniel Baker.
  2228. - A minor dhcpd.conf.5 manpage error was fixed.
  2230.                         Changes since 3.0.1rc14
  2232. - The global variable 'cur_time' was centralized and is now uniformly of a
  2233.   type #defined in system-dependent headers.  It had previously been defined
  2234.   in one of many places as a 32-bit value, and this causes mayhem on 64-bit
  2235.   big endian systems.  It probably wasn't too healthy on little endian
  2236.   systems either.
  2238. - A printf format string error introduced in rc14 was repaired.
  2240. - AIX system-dependent header file was altered to only define NO_SNPRINTF
  2241.   if the condition used to #ifdef in vsnprintf in AIX' header files
  2242.   is false.
  2244. - The Alpha/OSF system-dependent header file was altered to define
  2245.   NO_SNPRINTF on OS revisions older than 4.0G.
  2247. - omapip/test.c had string.h added to its includes.
  2249.                         Changes since 3.0.1rc13
  2251. ! CAN-2004-0460 - CERT VU#317350: Five stack overflow exploits were closed
  2252.   in logging messages with excessively long hostnames provided by the
  2253.   clients.  It is highly probable that these could have been used by
  2254.   attackers to gain arbitrary root access on systems using ISC DHCP 3.0.1
  2255.   release candidates 12 or 13.  Special thanks to Gregory Duchemin for
  2256.   both finding and solving the problem.
  2258. ! CAN-2004-0461 - CERT VU#654390: Once the above was closed, an opening
  2259.   in log_*() functions was evidenced, on some specific platforms where
  2260.   vsnprintf() was not believed to be available and calls were wrapped to
  2261.   sprintf() instead.  Again, credit goes to Gregory Duchemin for finding
  2262.   the problem.  Calls to snprintf() are now linked to a distribution-local
  2263.   snprintf implementation, only in those cases where the architecture is
  2264.   not known to provide one (see includes/cf/[arch].h).  If you experience
  2265.   linking problems with snprintf/vsnprintf or 'isc_print_' functions, this
  2266.   is where to look.  This vulnerability did not exist in any previously
  2267.   published version of ISC DHCP.
  2269. - Compilation on hpux 11.11 was repaired.
  2271. - 'The cross-compile bug fix' was backed out.
  2273.                         Changes since 3.0.1rc12
  2275. - Fixed a bug in omapi lease lookup function, to form the hardware
  2276.   address for the hash lookup correctly, thanks to a patch from
  2277.   Richard Hirst.
  2279. - Fixed a bug where dhcrelay was sending relayed responses back to the
  2280.   broadcast address, but with the source's unicast mac address.  Should
  2281.   now conform to rfc2131 section 4.1.
  2283. - Cross-compile bug fix; use $(AR) instead of ar.  Thanks to Morten Brorup.
  2285. - Fixed a crash bug in dhclient where dhcpd servers that do not provide
  2286.   renewal times results in an FPE.  As a side effect, dhclient can now
  2287.   properly handle 0xFFFFFFFF (-1) expiry times supplied by servers.  Thanks
  2288.   to a patch from Burt Silverman.
  2290. - The 'ping timeout' debugs from rc12 were removed to -DDEBUG only,
  2291.   and reformatted to correct a compilation error on Solaris platforms.
  2293. - A patch was applied which fixes a case where leases read from the
  2294.   leases database do not properly over-ride previously read leases.
  2296. - dhcpctl.3 manpage was tweaked.
  2298.                         Changes since 3.0.1rc11
  2300. - A patch from Steve Campbell was applied with minor modifications to
  2301.   permit reverse dns PTR record updates with values containing spaces.
  2303. - A patch from Florian Lohoff was applied with some modifications to
  2304.   dhcrelay.  It now discards packets whose hop count exceeds 10 by default,
  2305.   and a command-line option (-c) can be used to set this threshold.
  2307. - A failover bug relating to identifying peers by name length instead of
  2308.   by name was fixed.
  2310. - Declaring failover configs within shared-network statements should no
  2311.   longer result in error.
  2313. - The -nw command line option to dhclient now works.
  2315. - Thanks to a patch from Michael Richardson:
  2316.         - Some problems with long option processing have been fixed.
  2317.         - Some fixes to minires so that updates of KEY records will work.
  2319. - contrib/ms2isc was updated by Shu-Min Chang of the Intel Corporation.
  2320.   see contrib/ms2isc/readme.txt for revision notes.
  2322. - Dhclient no longer uses shell commands to kill another instance of
  2323.   itself, it sends the signal directly.  Thanks to a patch from Martin
  2324.   Blapp.
  2326. - The FreeBSD dhclient-script was changed so that a failure to write to
  2327.   /etc/resolv.conf does not prematurely end the script.  This keeps dhclient
  2328.   from looping infinitely when this is the case.  Thanks to a patch from
  2329.   Martin Blapp.
  2331. - A patch from Bill Stephens was applied which resolves a problem with lease
  2332.   expiry times in failover configurations.
  2334. - A memory leak in configuration parsing was closed thanks to a patch from
  2335.   Steve G.
  2337. - The function which discovers interfaces will now skip non-broadcast or
  2338.   point-to-point interfaces, thanks to a patch from David Brownlee.
  2340. - Options not yet known by the dhcpd or dhclient have had their names
  2341.   changed such that they do not contain # symbols, in case they should ever
  2342.   appear in a lease file.  An option that might have been named "#144" is
  2343.   now "unknown-144".
  2345. - Another patch from Bill Stephens which allows the ping-check timeout to
  2346.   be configured as 'ping-timeout'.  Defaults to 1.
  2348.                         Changes since 3.0.1rc10
  2350. - Potential buffer overflows in minires repaired.
  2352. - A change to the linux client script to use /bin/bash, since /bin/sh may
  2353.   not be bash.
  2355. - Some missing va_end cleanups thanks to a patch from Thomas Klausner.
  2357. - A correction of boolean parsing syntax validation - some illegal syntaxes
  2358.   that worked before are now detected and produce errs, some legal syntaxes
  2359.   that errored before will now work properly.
  2361. - Some search-and-replace errors that caused some options to change their
  2362.   names was repaired.
  2364. - Shu-min Chang of the Intel corporation has contributed a perl script and
  2365.   module that converts the MS NT4 DHCP configuration to a ISC DHCP3
  2366.   configuration file.
  2368. - Applied the remainder of the dhcpctl memory leak patch provided by Bill
  2369.   Squier at ReefEdge, Inc.  ([email protected]).
  2371. - Missing non-optional failover peer configurations will now result in a soft
  2372.   error rather than a null dereference.
  2374.                         Changes since 3.0.1rc9
  2376. - A format string was corrected to fix compiler warnings.
  2378. - A number of spelling corrections were made in the man pages.
  2380. - The dhclient.conf.5 man page was changed to refer to do-forward-updates
  2381.   rather than a configuration option that doesn't exist.
  2383. - A FreeBSD-specific bug in the interface removal handling was fixed.
  2385. - A Linux-specific Token Ring detection problem was fixed.
  2387. - Hashes removed from as-yet-unknown agent options, having those options
  2388.   appear in reality before we know about them will no longer produce
  2389.   self-corrupting lease databases.
  2391. - dhclient will use the proper port numbers now when using the -g option.
  2393. - A order-of-operations bug with 2 match clauses in 1 class statement is
  2394.   fixed thanks to a patch from Andrew Matheson.
  2396. - Compilation problems on Solaris were fixed.
  2398. - Compilation problems when built with DEBUG or DEBUG_PACKET were repaired.
  2400. - A fix to the dhcp ack process which makes certain group options will be
  2401.   included in the first DHCPOFFER message was made thanks to a patch from
  2402.   Ling Gou.
  2404. - A few memory leaks were repaired thanks to patches from Bill Squier at
  2405.   ReefEdge, Inc.  ([email protected]).
  2407. - A fix for shared-networks that sometimes give clients options for the
  2408.   wrong subnets (in particular, 'option routers') was applied, thanks to
  2409.   Ted Lemon for the patch.
  2411. - Omshell's handling of dotted octets as values was changed such that dots
  2412.   one after the other produce zero values in the integer string.
  2414.                         Changes since 3.0.1rc8
  2416. - Fix a format string vulnerability in the server that could lead to a
  2417.   remote root compromise (discovered by NGSEC Research Team, www.ngsec.com).
  2419. - Add additional support for NetBSD/sparc64.
  2421. - Fix a bug in the command-line parsing of the client.  Also, resolve
  2422.   a memory leak.
  2424. - Add better support for shells other than bash in the Linux client
  2425.   script.
  2427. - Various build fixes for modern versions of FreeBSD and Linux.
  2429. - Fix a bad bounds check when printing binding state names.
  2431. - Clarify documentation about fixed-address and multiple addresses.
  2433. - Fix a typo in the authoritative error message.
  2435. - Make a log entry when we can't write a billing class.
  2437. - Use conversion targets that are the right size on all architectures.
  2439. - Increment the hop count when relaying.
  2441. - Log a message when lease state is changed through OMAPI.
  2443. - Don't rerun the shared_network when evaluating the pool.
  2445. - Fix a reversed test in the parser.
  2447. - Change the type of rbuf_max.
  2449. - Make FTS_LAST a manifest constant to quiet warnings.
  2451.                         Changes since 3.0.1rc7
  2453. - Fix two compiler warnings that are generated when compiling on Solaris
  2454.   with gcc.   These stop the build, even though they weren't actually
  2455.   errors, because we prefer that our builds generate no warnings.
  2457.                         Changes since 3.0.1rc6
  2459. - Don't allow a lease that's in the EXPIRED, RELEASED or RESET state
  2460.   to be renewed.
  2462. - Implement lease stealing for cases where the primary has fewer leases
  2463.   than the secondary, as called for by the standard.
  2465. - Add a fudge factor to the lease expiry acceptance code, (suggested
  2466.   by Kevin Miller of CMU).
  2468. - Fix a bug in permit_list_match that made it much too willing to say
  2469.   that two permit lists matched.
  2471. - Unless DEBUG_DNS_UPDATES is defined, print more user-friendly (and
  2472.   also more compact) messages about DNS updates.
  2474. - Fix a bug in generating wire-format domain names for the FQDN option.
  2476. - Fix a bug where the FQDN option would not be returned if the client
  2477.   requested it, contrary to the standard.
  2479. - On Darwin, use the FreeBSD DHCP client script.
  2481. - On NetBSD/sparc, don't check for casting warnings.
  2483. - Add a flag in the DHCP client to disable updating the client's A
  2484.   record when sending an FQDN option indicating that the client is
  2485.   going to update its A record.
  2487. - In the client, don't attempt a DNS update until one second after
  2488.   configuring the new IP address, and if the update times out, keep
  2489.   trying until a response, positive or negative, is received from the
  2490.   DNS server.
  2492. - Fix an uninitialized memory bug in the DHCP client.
  2494. - Apply some FreeBSD-specific bug fixes suggested by Murray Stokely.
  2496. - Fix a bug in ns_parserr(), where it was returning the wrong sort
  2497.   of result code in some cases (suggested by Ben Harris of the
  2498.   NetBSD project).
  2500. - Fix a bug in is_identifier(), where it was checking against EOF
  2501.   instead of the END_OF_FILE token (also suggested by Ben Harris).
  2503. - Fix a bug where if an option universe contained no options, the
  2504.   DHCP server could dump core (Walter Steiner).
  2506. - Fix a bug in the handling of encapsulated options.
  2508. - Fix a bug that prevented NWIP suboptions from being processed.
  2510. - Delete the FTS_BOOTP and FTS_RESERVED states and implement them
  2511.   as modifier flags to the FTS_ACTIVE state, as called for in the
  2512.   failover protocol standard.
  2514. - Fix bugs in the pool merging code that resulted in references and
  2515.   dereferences of null pointers.   This bug had no impact unless the
  2516.   POINTER_DEBUG flag was defined.
  2518. - In the server, added a do-forward-updates flag that can be used to
  2519.   disable forward updates in all cases, so that sites that want the
  2520.   clients to take sole responsibility for updating their A record can
  2521.   do so.
  2523. - Make it possible to disable optimization of PTR record updates.
  2525.                         Changes since 3.0.1rc5
  2527. - Include some new documentation and changes provided by Karl Auer.
  2529. - Add a workaround for some Lexmark printers that send a double-NUL-
  2530.   terminated host-name option, which would break DNS updates.
  2532. - Fix an off-by-one error in the MAC-address checking code for
  2533.   DHCPRELEASE that was added in 3.0.1rc5.
  2535. - Fix a bug where client-specific information was not being discarded
  2536.   from the lease when it expired or was released, resulting in
  2537.   problems if the lease was reallocated to a different client.
  2539. - If more than one allocation pool is specified that has the same set
  2540.   of constraints as another allocation pool on the same shared
  2541.   network, merge the two pools.
  2543. - Don't print an error in fallback_discard, since this just causes
  2544.   confusion and does not appear to be helping to encourage anyone to
  2545.   fix this bug.
  2547.                         Changes since 3.0.1rc4
  2549. - Fix a bug that would cause the DHCP server to spin if asked to parse
  2550.   a certain kind of incorrect statement.
  2552. - Fix a related bug that would prevent an error from being reported in
  2553.   the same case.
  2555. - Additional documentation.
  2557. - Make sure that the hardware address matches the lease when
  2558.   processing a DHCPRELEASE message.
  2560.                         Changes since 3.0.1rc3
  2562. - A minor bug fix in the arguments to a logging function call.
  2563. - Documentation update for dhcpd.conf.
  2565.                         Changes since 3.0.1rc2
  2567. - Allow the primary to send a POOLREQ message.   This isn't what the current
  2568.   failover draft says to do, so we may have to back it out if I can't get the
  2569.   authors to relent, but the scheme for balancing that's specified in the
  2570.   current draft seems needlessly hairy, so I'm floating a trial balloon.
  2571.   The rc1 code did not implement the method described in the draft either.
  2573.                         Changes since 3.0.1rc1
  2575. - Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
  2576.   domain or RRSET.   This allows the DHCP server to forget about a name
  2577.   it added to the DNS once it's been removed, even if the DHCP server
  2578.   wasn't the one that removed it.
  2580. - Install defaults for failover maximum outstanding updates and maximum
  2581.   silent time.   This prevents problems that might occur if these values
  2582.   were not configured.
  2584. - Don't do DDNS deletes if ddns-update-style is none.
  2586. - Return relay agent information options in DHCPNAK.   This prevents DHCPNAK
  2587.   messages from being dropped when the relay agent information option contains
  2588.   routing information.
  2590. - Fix a problem where coming up in recover wouldn't result in an update
  2591.   request being sent.
  2593. - Add some more chatty messages when we start a recovery update and when it's
  2594.   done.
  2596. - Fix a possible problem where some state might have been left around
  2597.   after the peer lost contact and regained contact about how many updates
  2598.   were pending.
  2600. - Don't nix a lease update because of a lease conflict.   This test has
  2601.   never (as far as I know) prevented a mistake, and it appears to cause
  2602.   problems with failover.
  2604. - Add support in rc history code for keeping a selective history, rather
  2605.   than a history of all references and dereferences.   This code is only used
  2606.   when extensive additional debugging is enabled.
  2608.                            Changes since 3.0
  2610. - Make allocators for hash tables.   As a side effect, this fixes a memory
  2611.   smash in the subclass allocation code.
  2613. - Fix a small bug in omshell where if you try to close an object when
  2614.   no object is open, it dumps core.
  2616. - Fix an obscure coredump that could occur on shutdown.
  2618. - Fix a bug in the recording of host declaration rubouts in the lease file.
  2620. - Fix two potential spins in the host deletion code.
  2622. - Fix a core dump that would happen if an application tried to update
  2623.   a host object attribute with a null value.
  2625.                 Changes since 3.0 Release Candidate 12
  2627. - Fix a memory leak in the evaluation code.
  2629. - Fix an obscure core dump.
  2631. - Print a couple of new warnings when parsing the configuration file
  2632.   when crucial information is left out.
  2634. - Log "no free leases" as an error.
  2636. - Documentation updates.
  2638.                 Changes since 3.0 Release Candidate 11
  2640. - Always return a subnet selection option if one is sent.
  2642. - Fix a warning that was being printed because an automatic data
  2643.   structure wasn't zeroed.
  2645. - Fix some failover state transitions that were being handled
  2646.   incorrectly.
  2648. - When supersede_lease is called on a lease whose end time has already
  2649.   expired, but for which a state transition has not yet been done, do
  2650.   a state transition.   This fixes the case where if the secondary
  2651.   allocated a lease to a client and the lease "expired" while the
  2652.   secondary was in partner-down, no expiry event would actually
  2653.   happen, so the lease would remain active until the primary was
  2654.   restarted.
  2656.                 Changes since 3.0 Release Candidate 10
  2658. - Fix a bug that was preventing released leases from changing state
  2659.   in failover-enabled pools.
  2661. - Fix a core dump in the client identifier finder code (for host
  2662.   declarations).
  2664. - Finish fixing a bug where bogus data would sometimes get logged to
  2665.   the dhclient.leases file because it was opened as descriptor 2.
  2667. - Fix the Linux dhclient-script according to suggestions made by
  2668.   several people on the dhcp-client mailing list.
  2670. - Log successful DNS updates at LOG_INFO, not LOG_ERROR.
  2672. - Print an error message and refuse to run if a failover peer is
  2673.   defined but not referenced by any pools.
  2675. - Correct a confusing error message in failover.
  2677.                 Changes since 3.0 Release Candidate 9
  2679. - Fix a bug in lease allocation for Dynamic BOOTP clients.
  2681.           Changes since 3.0 Release Candidate 8 Patchlevel 2
  2683. - Fix a bug that prevented update-static-leases from working.
  2685. - Document failover-state OMAPI object.
  2687. - Fix a compilation error on SunOS 4.
  2689.           Changes since 3.0 Release Candidate 8 Patchlevel 1
  2691. - Fix a parsing bug that broke dns updates (both interim and ad-hoc).
  2692.   This was introduced in rc8pl1 as an unintended result of the memory
  2693.   leakage fixes that were in pl1.
  2695. - Fix a long-standing bug where the server would record that an update
  2696.   had been done for a client with no name, even though no update had
  2697.   been done, and then when the client's lease expired the deletion of
  2698.   that nonexistant record would time out because the name was the null
  2699.   string.
  2701. - Clean up the omshell, dhcpctl and omapi man pages a bit.
  2703.                 Changes since 3.0 Release Candidate 8
  2705. - Fix a bug that could cause the DHCP server to spin if
  2706.   one-lease-per-client was enabled.
  2708. - Fix a bug that was causing core dumps on BSD/os in the presence of
  2709.   malformed packets.
  2711. - In partner-down state, don't restrict lease lengths to MCLT.
  2713. - On the failover secondary, record the MCLT received from the primary
  2714.   so that if we come up without a connection to the primary we don't
  2715.   wind up giving out zero-length leases.
  2717. - Fix some compilation problems on BSD/os.
  2719. - Fix a bunch of memory leaks.
  2721. - Fix a couple of bugs in the option printer.
  2723. - Fix an obscure error reporting bug in the dns update code, and also
  2724.   make the message clearer when a key algorithm isn't supported.
  2726. - Fix a bug in the tracing code that prevented trace runs that used
  2727.   tcp connections from being played back.
  2729. - Add some additional debugging capability for catching memory leaks
  2730.   on exit.
  2732. - Make the client release the lease correctly on shutdown.
  2734. - Add some configurability to the build system.
  2736. - Install omshell manual page in man1, not man8.
  2738. - Craig Gwydir sent in a patch that fixes a long-standing bug in the
  2739.   DHCP client that could cause core dumps, but that for some reason
  2740.   hadn't been noticed until now.
  2742.                 Changes since 3.0 Release Candidate 7
  2744. - Fix a bug in failover where we weren't sending updates after a
  2745.   transition from communications-interrupted to normal.
  2747. - Handle expired/released/reset -> free transition according to the
  2748.   protocol specification (this works - the other way not only wasn't
  2749.   conformant, but also didn't work).
  2751. - Add a control object in both client and server that allows either
  2752.   daemon to be shut down cleanly.
  2754. - When writing a lease, if we run out of disk space, shut down the
  2755.   output file and insist on writing a new one before proceeding.
  2757. - In the server, if the OMAPI listener port is occupied, keep trying
  2758.   to get it, rather than simply giving up and exiting.
  2760. - Support fetching variables from leases and also updating and adding
  2761.   variables to leases via OMAPI.
  2763. - If two failover peers have wildly different clocks, refuse to start
  2764.   doing failover.
  2766. - Fix a bug in the DNS update code that could cause core dumps when
  2767.   running on alpha processors.
  2769. - Fixed a bug in ddns updates for static lease entries, thanks to a
  2770.   patch from Andrey M Linkevitch.
  2772. - Add support for Darwin/MacOS X
  2774. - Install omshell (including new documentation).
  2776. - Support DNS updates in the client (this is a very obscure feature
  2777.   that most DHCP client users probably will not be able to use).
  2779. - Somewhat cleaner status logging in the client.
  2781. - Make OMAPI key naming syntax compatible with the way keys are
  2782.   actually named (key names are domain names).
  2784. - Fix a bug in the lease file writer.
  2786. - Install DHCP ISC headers in a different place than BIND 9 ISC
  2787.   headers, to avoid causing trouble in BIND 9 builds.
  2789. - Don't send updates for attributes on an object when the attributes
  2790.   haven't changed.   Support deleting attributes on remote objects.
  2792. - Fix a number of bugs in omshell, and add the unset and refresh
  2793.   statements.
  2795. - Handle disconnects in OMAPI a little bit more intelligently (so that
  2796.   the caller gets ECONNRESET instead of EINVAL).
  2798. - Fix a bunch of bugs in the handling of clients that have existing
  2799.   leases when the try to renew their leases while failover is
  2800.   operating.
  2802.                 Changes since 3.0 Release Candidate 6
  2804. - Fix a core dump that could happen when processing a DHCPREQUEST from
  2805.   a client that had a host declaration that contained both a
  2806.   fixed-address declaration and a dhcp-client-identifier option
  2807.   declaration, if the client identifier was longer than nine bytes.
  2809. - Fix a memory leak that could happen in certain obscure cases when
  2810.   using omapi to manipulate leases.
  2812. - Fix some bugs and omissions in omshell.
  2814.                 Changes since 3.0 Release Candidate 5
  2816. - Fix a bug in omapi_object_dereference that prevented objects in
  2817.   chains from having their reference counts decreased on dereference.
  2819. - Fix a bug in omapi_object_dereference that would prevent object
  2820.   chains from being freed upon removal of the last reference external
  2821.   to the chain.
  2823. - Fix a number of other memory leaks in the OMAPI protocol subsystem.
  2825. - Add code in the OMAPI protocol handler to trace memory leakage.
  2827. - Clean up the memory allocation/reference history printer.
  2829. - Support input of dotted quads and colon-separated hex lists as
  2830.   attribute values in omshell.
  2832. - Fix a typo in the Linux interface discovery code.
  2834. - Conditionalize a piece of trace code that wasn't conditional.
  2836.                 Changes since 3.0 Release Candidate 4
  2838. - Fix a bug that would prevent leases from being abandoned properly on
  2839.   DHCPDECLINE.
  2841. - Fix failover peer OMAPI support.
  2843. - In failover, correctly handle expiration of leases.   Previously,
  2844.   leases would never be reclaimed because they couldn't make the
  2845.   transition from EXPIRED to FREE.
  2847. - Fix some broken failover state transitions.
  2849. - Documentation fixes.
  2851. - Take out an unnecessary check in DHCP relay agent information option
  2852.   stashing code that was preventing REBINDING clients from rebinding.
  2854. - Prevent failover peers from allocating leases in DHCPREQUEST
  2855.   processing if the lease belongs to the other server.
  2857. - Record server version in lease file introductory comment.
  2859. - Correctly report connection errors in OMAPI and failover.
  2861. - Make authentication signature algorithm name comparisons in OMAPI
  2862.   case-insensitive.
  2864. - Fix compile problem on SunOS 4.x
  2866. - If a signature algorithm is not terminated with '.', terminate it so
  2867.   that comparisons between fully-qualified names will work
  2868.   consistently.
  2870. - Different SIOCGIFCONF probe code, may "fix" problem on some Linux
  2871.   systems with the probe not working correctly.
  2873. - Don't allow user to type omapi key on command line of omshell.
  2875.                 Changes since 3.0 Release Candidate 3
  2877. - Do lease billing on startup in a way that I *think* will finally do
  2878.   the billing correctly - the previous method could overbill as a
  2879.   result of duplicate leases.
  2881. - Document OMAPI server objects.
  2883.           Changes since 3.0 Release Candidate 2 Patchlevel 1
  2885. - Fix some problems in the DDNS update code.   Thanks to Albert
  2886.   Herranz for figuring out the main problem.
  2888. - Fix some reference counting errors on host entries that were causing
  2889.   core dumps.
  2891. - Fix a byte-swap bug in the token ring code, thanks to Jochen
  2892.   Friedrich.
  2894. - Fix a bug in lease billing, thanks to Jonas Bulow.
  2896.                 Changes since 3.0 Release Candidate 2
  2898. - Change the conditions under which a DHCPRELEASE is actually
  2899.   committed to be consistent with lease binding states rather than
  2900.   using the lease end time.   This may fix some problems with the
  2901.   billing class code.
  2903. - Fix a bug where lease updates would fail on Digital Unix (and maybe
  2904.   others) because malloc was called with a size of zero.
  2906. - Fix a core dump that happens when the DHCP server can't create its
  2907.   trace file.
  2909.           Changes since 3.0 Release Candidate 1 Patchlevel 1
  2911. - Fix the dhcp_failover_put_message to not attempt to allocate a
  2912.   zero-length buffer.   Some versions of malloc() fail if you try to
  2913.   allocate a zero-length buffer, and this was causing problems on,
  2914.   e.g., Digital Unix.
  2916. - Fix a case where the failover code was printing an error message
  2917.   when no error had occurred.
  2919. - Fix a problem where when a server went down and back up again, the
  2920.   peer would not see a state transition and so would stay in the
  2921.   non-communicating state.
  2923. - Be smart about going into recover_wait.
  2925. - Fix a problem in the failover implementation where peers would fail
  2926.   to come into sync if interrupted in the RECOVER state.   This could
  2927.   have been the cause of some problems people have reported recently.
  2929. - Fix a problem with billing classes where they would not be unbilled
  2930.   when the client lease expired.
  2932. - If select fails, figure out which descriptor is bad, and cut it out
  2933.   of the I/O loop.   This prevents a potentially nasty spin.  I
  2934.   haven't heard any report it in a while, but it came up consistently
  2935.   in testing.
  2937. - Fix a bug in the relay agent where if you specified interfaces on
  2938.   the command line, it would fail.
  2940. - Fix a couple of small bugs in the omapi connection object (no known
  2941.   user impact).
  2943. - Add the missing 3.0 Beta 1 lease conversion script.
  2945. - Read dhcp client script hooks if they exist, rather than only if
  2946.   they're executable.
  2948.                 Changes since 3.0 Release Candidate 1
  2950. - Fix a memory smash that happens when fixed-address leases are used.
  2952.   UPGRADE IMMEDIATELY.   This has been a long-standing bug - thanks to
  2953.   Alvise Nobile for discovering it and helping me to find it!
  2955. - Fix a small bug in binary-to-ascii, thanks to H. Peter Anvin of
  2956.   Transmeta.
  2958. - There is a known problem with the DHCP server doing failover on
  2959.   Compaq Alpha systems.   This patchlevel is not a release candidate
  2960.   because of this bug.   The bug should be straightforward to fix, so
  2961.   a new release candidate is expected shortly.
  2963. - There is a known problem in the DDNS update code that is probably a
  2964.   bug, and is not, as far as we know, fixed in this patchlevel.
  2966.                 Changes since 3.0 Beta 2 Patchlevel 24
  2968. - Went over problematic failover state transitions and made them all
  2969.   work, so that failover should now much less fragile.
  2971. - Add some dhcpctl and omapi documentation
  2973. - Fix compile errors when compiling with unusual predefines.
  2975. - Make Token Ring work on Linux 2.4
  2977. - Fix the Digital Unix BPF_WORDALIGN bug.
  2979. - Fix some dhcp client documentation errors.
  2981. - Update some parts of the README file.
  2983. - Support GCC on SCO.
  2985.                 Changes since 3.0 Beta 2 Patchlevel 23
  2987. - Fix a bug in the DNS update code where a status code was not being
  2988.   checked.   This may have been causing core dumps.
  2990. - When parsing the lease file, if a lease declaration includes a
  2991.   billing class statement, and the lease already has a billing class,
  2992.   unbill the old class.
  2994. - When processing failover transactions, where acks will be deferred,
  2995.   process the state transition immediately.
  2997. -  Don't try to use the new SIOCGIFCONF buffer size detection code on
  2998.    Linux 2.0, which doesn't provide this functionality.
  3000. - Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
  3002. - Fix a problem in using the which command in the configure script.
  3004. - Fix a parse error in the client when setting up an omapi listener.
  3006. - Document the -n and -g flags to the client.
  3008. - Make sure there is always a stdin and stdout on startup.   This
  3009.   prevents shell scripts from accidentally writing error messages into
  3010.   configuration files that happen to be opened as stderr.
  3012. - If an interface is removed, the client will now notice that it is
  3013.   gone rather than spinning.   This has only been tested on NetBSD.
  3015. - The client will attempt to get an address even if it can't create a
  3016.   lease file.
  3018. - Don't overwrite tracefiles.
  3020. - Fix some memory allocation bugs in failover.
  3022.                 Changes since 3.0 Beta 2 Patchlevel 22
  3024. - Apply some patches suggested by Cyrille Lefevre, who is maintaining
  3025.   the FreeBSD ISC DHCP Distribution port.
  3027. - Fix a core dump in DHCPRELEASE.
  3029.                 Changes since 3.0 Beta 2 Patchlevel 21
  3031. - This time for sure: fix the spin described in the changes for pl20.
  3033.                 Changes since 3.0 Beta 2 Patchlevel 20
  3035. - Fix a problem with Linux detecting large numbers of interfaces (Ben)
  3037. - Fix a memory smash in the quotify code, which was introduced in
  3038.   pl19.
  3040. - Actually fix the spin described in the changes for pl20.   The
  3041.   previous fix only partially fixed the problem - enough to get it
  3042.   past the regression test.
  3044.                 Changes since 3.0 Beta 2 Patchlevel 19
  3046. - Fix a bug that could cause the server to abort if compiled with
  3047.   POINTER_DEBUG enabled.
  3049. - Fix a bug that could cause the server to spin when responding to a
  3050.   DHCPREQUEST.
  3052. - Apply Joost Mulders' suggested patches for DLPI on x86.
  3054. - Support NUL characters in quoted strings.
  3056. - Install unformatted man pages on SunOS.
  3058.                 Changes since 3.0 Beta 2 Patchlevel 18
  3060. - Allow the server to be placed in partner-down state using OMAPI.
  3061.   (Damien Neil)
  3063. - Implement omshell, which can be used to do arbitrary things to the
  3064.   server (in theory). (Damien Neil)
  3066. - Fix a case where if a client had two different leases the server could
  3067.   actually dereference the second one when it hadn't been referenced,
  3068.   leading to memory corruption and a core dump. (James Brister)
  3070. - Fix a case where a client could request the address of another client's
  3071.   lease, but find_lease wouldn't detect that the other client had it, and
  3072.   would attempt to allocate it to the client, resulting in a lease conflict
  3073.   message.
  3075. - Fix a case where a client with more than one client identifier could be
  3076.   given a lease where the hardware address was correct but the client
  3077.   identifier was not, resulting in a lease conflict message.
  3079. - Fix a problem where the server could write out a colon-separated
  3080.   hex list as a value for a variable, which would then not parse.
  3081.   The fix is to always write strings as quoted strings, with any
  3082.   non-printable characters quoted as octal escape sequences.   So
  3083.   a file written the old way still won't work, but new files written
  3084.   this way will work.
  3086. - Fix documentation for sending non-standard options.
  3088. - Use unparsable names for unknown options.    WARNING: this will
  3089.   break any configuration files that use the option-nnn convention.
  3090.   If you want to continue to use this convention for some options,
  3091.   please be sure to write a definition, like this:
  3093.   option option-nnn code nnn = string;
  3095.   You can use a descriptive name instead of option-nnn if you like.
  3097. - Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
  3098.   DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence.   This was the
  3099.   result of a deceptively silly bug in supersede_lease.
  3101. - Fix client script exit status check, according to a fix supplied by
  3102.   Hermann Lauer.
  3104. - Fix an endianness bug in the tracefile support, regarding ICMP
  3105.   messages.
  3107. - Fix a bug in the client where the medium would not work correctly if
  3108.   it contained quoted strings.
  3110.                        ** there was no pl17 **
  3112.                 Changes since 3.0 Beta 2 Patchlevel 16
  3114. - Add support for transaction tracing.   This allows the state of the
  3115.   DHCP server on startup, and all the subsequent transactions, to be
  3116.   recorded in a file which can then be played back to reproduce the
  3117.   behaviour of the DHCP server.   This can be used to quickly
  3118.   reproduce bugs that cause core dumps or corruption, and also for
  3119.   tracking down memory leaks.
  3121. - Incorporate some bug fixes provided by Joost Mulders for the DLPI
  3122.   package which should clear up problems people have been seeing on
  3123.   Solaris.
  3125. - Fix bugs in the handling of options stored as linked lists (agent
  3126.   options, fqdn options and nwip options) that could cause memory
  3127.   corruption and core dumps.
  3129. - Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
  3130.   not being send in some cases when they were needed.
  3132. - Make the lease structure somewhat more compact.
  3134. - Make initial failover startup *much* faster.   This was researched
  3135.   and implemented by Damien Neil.
  3137. - Add a --version flag to all executables, which prints the program
  3138.   name and version to standard output.
  3140. - Don't rewrite the lease file every thousand leases.
  3142. - A bug in nit.c for older SunOS machines was fixed by a patch sent in
  3143.   by Takeshi Hagiwara.
  3145. - Fix a memory corruption bug in the DHCP client.
  3147. - Lots of documentation updates.
  3149. - Add a feature allowing environment variables to be passed to the
  3150.   DHCP client script on the DHCP client command line.
  3152. - Fix client medium support, which had been broken for some time.
  3154. - Fix a bug in the DHCP client initial startup backoff interval, which
  3155.   would cause two DHCPDISCOVERS to be sent back-to-back on startup.
  3157.                 Changes since 3.0 Beta 2 Patchlevel 15
  3159. - Some documentation tweaks.
  3161. - Maybe fix a problem in the DLPI code.
  3163. - Fix some error code space inconsistencies in ddns update code.
  3165. - Support relay agents that intercept unicast DHCP messages to stuff
  3166.   agent options into them.
  3168. - Fix a small memory leak in the relay agent option support code.
  3170. - Fix a core dump that would occur if a packet was sent with no
  3171.   options.
  3173.                 Changes since 3.0 Beta 2 Patchlevel 14
  3175. - Finish fixing a long-standing bug in the agent options code.   This
  3176.   was causing core dumps and failing to operate correctly - in
  3177.   particular, agent option stashing wasn't working.   Agent option
  3178.   stashing should now be working, meaning that agent options can be
  3179.   used in class statements to control address allocation.
  3181. - Fix up documentation.
  3183. - Fix a couple of small memory leaks that would have added up
  3184.   significantly in a high-demand situation.
  3186. - Add a log-facility configuration parameter.
  3188. - Fix a compile error on some older operating systems.
  3190. - Add the ability in the client to execute certain statements before
  3191.   transmitting packets to the server.   Handy for debugging; not much
  3192.   practical use otherwise.
  3194. - Don't send faked-out giaddr when renewing or bound - again, useful
  3195.   for debugging.
  3197.                 Changes since 3.0 Beta 2 Patchlevel 13
  3199. - Fixed a problem where the fqdn decoder would sometimes try to store
  3200.   an option with an (unsigned) negative length, resulting in a core
  3201.   dump on some systems.
  3203. - Work around the Win98 DHCP client, which NUL-terminates the FQDN
  3204.   option.
  3206. - Work around Win98 and Win2k clients that will claim they want to do
  3207.   the update even when they don't have any way to do it.
  3209. - Fix some log messages that can be printed when failover is operating
  3210.   that were not printing enough information.
  3212. - It was possible for a DHCPDISCOVER to get an allocation even when
  3213.   the state machine said the server shouldn't be responding.
  3215. - Don't load balance DHCPREQUESTs from clients in RENEWING and
  3216.   REBINDING, since in RENEWING, if we heard it, it's for us, and in
  3217.   REBINDING, the client wouldn't have got to REBINDING if its primary
  3218.   were answering.
  3220. - When we get a bogus state lease binding state transition, don't do
  3221.   the transition.
  3224.                 Changes since 3.0 Beta 2 Patchlevel 12
  3226. - Fixed a couple of silly compile errors.
  3228.                 Changes since 3.0 Beta 2 Patchlevel 11
  3230. - Albert Herranz tracked down and fixed a subtle bug in the base64
  3231.   decoder that would prevent any key with an 'x' in its base64
  3232.   representation from working correctly.
  3234. - Thanks to Chris Cheney and Michael Sanders, we have a fix for the
  3235.   hang that they both spotted in the DHCP server - when
  3236.   one-lease-per-client was set, the code to release the "other" lease
  3237.   could spin.
  3239. - Fix a problem with alignment of the input buffer in bpf in cases
  3240.   where two packets arrive in the same bpf read.
  3242. - Fix a problem where the relay agent would crash if you specified an
  3243.   interface name on the command line.
  3245. - Add the ability to conditionalize client behaviour based on the
  3246.   client state.
  3248. - Add support for the FQDN option, and added support for a new way of
  3249.   doing ddns updates (ddns update style interim) that allows more than
  3250.   one DHCP server to update the DNS for the same network(s).   This
  3251.   was implemented by Damien Neil with some additional functionality
  3252.   added by Ted Lemon.
  3254. - Damien added a "log" statement, so that the configuration file can
  3255.   be made to log debugging information and other information.
  3257. - Fixed a bug that caused option buffers not to be terminated with an
  3258.   end option.
  3260. - Fixed a long-standing bug in the support for option spaces where the
  3261.   options are stored as an ordered list rather than in a hash table,
  3262.   which could theoretically result in memory pool corruption.
  3264. - Prevent hardware declarations with no actual hardware address from
  3265.   being written as something unparsable, and behave correctly in the
  3266.   face of a null hardware address on input.
  3268. - Allow key names to be FQDNs, and qualify the algorithm name if it is
  3269.   specified unqualified.
  3271. - Modify the DDNS update code so that it never prints the "resolver
  3272.   failed" message, but instead says *why* the resolver failed.
  3274. - Officially support the subnet selection option, which now has an
  3275.   RFC.
  3277. - Fix a build bug on MacOS X.
  3279. - Allow administrator to disable ping checking.
  3281. - Clean up dhcpd.conf documentation and add more information about how
  3282.   it works.
  3284.                 Changes since 3.0 Beta 2 Patchlevel 10
  3286. - Fix a bug introduced during debugging (!) and accidentally committed
  3287.   to CVS.
  3289.                 Changes since 3.0 Beta 2 Patchlevel 9
  3291. - Fix DHCP client handling of vendor encapsulated options.
  3293. - Fix a bug in the handling of relay agent information options introduced
  3294.   in patchlevel 9.
  3296. - Stash agent options on client leases by default, and use the stashed
  3297.   options at renewal time.
  3299. - Add the ability to test the client's binding state in the client
  3300.   configuration language.
  3302. - Fix a core dump in the DNS update code.
  3304. - Fix some expression evaluation bugs that were causing updates to be
  3305.   done when no client hostname was received.
  3307. - Fix expression evaluation debugging printfs.
  3309. - Teach pretty_print_option to print options in option spaces other than
  3310.   the DHCP option space.
  3312. - Add a warning message if the RHS of a not is not boolean.
  3314. - Never select for more than a day, because some implementations of
  3315.   select will just fail if the timeout is too long (!).
  3317. - Fix a case where a DHCPDISCOVER from an unknown network would be
  3318.   silently dropped.
  3320. - Fix a bug where if a client requested an IP address for which a different
  3321.   client had the lease, the DHCP server would reallocate it anyway.
  3323. - Fix the DNS update code so that if the client changes its name, the DNS
  3324.   will be correctly updated.
  3326.                 Changes since 3.0 Beta 2 Patchlevel 8
  3328. - Oops, there was another subtle math error in the header-length
  3329.   bounds-checking.
  3331.                 Changes since 3.0 Beta 2 Patchlevel 7
  3333. - Oops, forgot to byte-swap udp header length before bounds-checking it.
  3335.                 Changes since 3.0 Beta 2 Patchlevel 6
  3337. - Fix a possible DoS attack where a client could cause the checksummer
  3338.   to dump core.   This was a read, not a write, so it shouldn't be
  3339.   possible to exploit it any further than that.
  3341. - Implement client- and server-side support for using the Client FQDN
  3342.   option.
  3344. - Support for other option spaces in the client has been added.   This
  3345.   means that it is now possible to define a vendor option space on the
  3346.   client, request options in that space from the server (which must
  3347.   define the same option space), and then use those options in the
  3348.   client.   This also allows NWIP and Client FQDN options to be used
  3349.   meaningfully.
  3351. - Add object initializer support.   This means that objects can now be
  3352.   initialized to something other than all-zeros when allocated, which
  3353.   makes, e.g., the interface object support code a little more robust.
  3355. - Fix an off-by-one bug in the host stuffer.   This was causing host
  3356.   deletes not the work, and may also have been causing OMAPI
  3357.   connections to get dropped.   Thanks to James Brister for tracking
  3358.   this one down!
  3360. - Fixed a core dump in the interface discovery code that is triggered
  3361.   when there is no subnet declaration for an interface, but the server
  3362.   decides to continue running.   Thanks to Shane Kerr for tracking
  3363.   down and fixing this problem.
  3365.                 Changes since 3.0 Beta 2 Patchlevel 5
  3367. - Fix a bug in the recent enhancement to the interface discovery code
  3368.   to support arbitrary-length interface lists.
  3370. - Support NUL-terminated DHCP options when initializing client-script
  3371.   environment.
  3373. - Fix suffix operator.
  3375. - Fix NetWare/IP option parsing.
  3377. - Better error/status checking in dhcpctl initialization and omapi
  3378.   connection code.
  3380. - Fix a potential memory smash in dhcpctl code.
  3382. - Fix SunOS4 and (maybe) Ultrix builds.
  3384. - Fix a bug where a certain sort of incoming packet could cause a core
  3385.   dump on Solaris (and probably elsewhere).
  3387. - Add some more safety checks in error logging code.
  3389. - Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
  3391. - Fix relay agent so that if an interface is specified on the command
  3392.   line, the relay agent does not dump core.
  3394. - Fix class matching so that match if can be combined with match or
  3395.   spawn with.
  3397. - Do not allow spurious leases in the lease database to introduce
  3398.   potentially bogus leases into the in-memory database.
  3400. - Fix a byte-order problem in the client hardware address type code
  3401.   for OMAPI.
  3403. - Be slightly less picky about what sort of hardware addresses OMAPI
  3404.   can install in host declarations.
  3406.                 Changes since 3.0 Beta 2 Patchlevel 4
  3408. - Incorporated Peter Marschall's proposed change to array/record
  3409.   parsing, which allows things like the slp-agent option to be encoded
  3410.   correctly.   Thanks very much to Peter for taking the initiative to
  3411.   do this, and for doing such a careful job of it (e.g., updating the
  3414. - Added an encoding for the slp-agent option.   :')
  3416. - Fixed SunOS 4 build.  Thanks to Robert Elz for responding to my
  3417.   request for help on this with patches!
  3419. - Incorporated a change that should fix a problem reported by Philippe
  3420.   Jumelle where when the network connection between two servers is
  3421.   lost, they never reconnect.
  3423. - Fix client script files other than that for NetBSD to actually use
  3424.   make_resolv_conf as documented in the manual page.
  3426. - Fix a bug in the packet handling code that could result in a core
  3427.   dump.
  3429. - Fix a bug in the bootp code where responses on the local net would
  3430.   be sent to the wrong MAC address.   Thanks to Jerry Schave for
  3431.   catching this one.
  3433.                 Changes since 3.0 Beta 2 Patchlevel 3
  3435. - In the DHCP client, execute client statements prior to using the values
  3436.   of options, so that the client configuration can overridden, e.g., the
  3437.   lease renewal time.
  3439. - Fix a reference counting error that would result in very reproducible
  3440.   failures in updates, as well as occasional core dumps, if a zone was
  3441.   declared without a key.
  3443. - Fix some Linux 2.0 compilation problems.
  3445. - Fix a bug in scope evaluation during execution of "on" statements that
  3446.   caused values not to be recorded on leases.
  3448. - If the dhcp-max-message-size option is specified in scope, and the
  3449.   client didn't send this option, use the one specified in scope to
  3450.   determine the maximum size of the response.
  3452.                 Changes since 3.0 Beta 2 Patchlevel 2
  3454. - Fix a case where spawning subclasses were being allocated
  3455.   incorrectly, resulting in a core dump.
  3457. - Fix a case where the DHCP server might inappropriately NAK a
  3458.   RENEWING client.
  3460. - Fix a place dhcprequest() where static leases could leak.
  3462. - Include memory.h in omapip_p.h so that we don't get warnings about
  3463.   using memcmp().
  3465.                 Changes since 3.0 Beta 2 Patchlevel 1
  3467. - Notice when SIOCFIGCONF returns more data than fit in the buffer -
  3468.   allocate a larger buffer, and retry.   Thanks to Greg Fausak for
  3469.   pointing this out.
  3471. - In the server, if no interfaces were configured, report an error and
  3472.   exit.
  3474. - Don't ever record a state of 'startup'.
  3476. - Don't try to evaluate the local failover binding address if none was
  3477.   specified.   Thanks to Joseph Breu for finding this.

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