546 lines
19 KiB
Plaintext
546 lines
19 KiB
Plaintext
Internet Software Consortium DHCP Distribution
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Version 3, Beta 2, Patchlevel 24
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April 5, 2001
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Release Notes
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This is a development snapshot of Version 3 of the Internet Software
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Consortium DHCP Distribution.
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NEW FEATURES
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Version 3, Beta 2 of the ISC DHCP Distribution includes the following
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features that are new since version 2.0:
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- DHCP Failover Protocol support
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- OMAPI, an API for accessing and modifying the DHCP server and
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client state.
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- Conditional behaviour
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- Storing arbitrary information on leases
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- Address pools with access control
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- Client classing
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- Address allocation restriction by class
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- Relay agent information option support
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- Dynamic DNS updates
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- Many bug fixes, performance enhancements, and minor new DHCP
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protocol features.
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This beta release is quite new, and is running in production at only a
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few sites. We strongly recommend that you exercise caution in
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installing it. The 3.0 Beta 2 lease file is not backwards compatible
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with the 3.0 Beta 1 lease file, so if you have to go back, you will
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have to convert your lease files back to the 3.0 Beta 1 format - if
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you try to run a 3.0 Beta 1 server on a 3.0 Beta 2 lease file, it will
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cheerfully delete all your leases. Having said that, of course the
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way that new releases of open source software become stable is by
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people using them, finding the bugs, and reporting the bugs. So
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while we urge you to exercise caution, we would also appreciate any
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testing or production use you can safely do.
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For information on how to install, configure and run this software,
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as well as how to find documentation and report bugs, please consult
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the README file.
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The Dynamic DNS Update support is a descendent of an implementation
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done by Lans Carstensen and Brian Dols at Rose-Hulman Institute of
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Technology, Jim Watt at Applied Biosystems, Irina Goble at Integrated
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Measurement Systems, Igor Sharfmesser at Kazakh Telecom, and Brian
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Murrell at BC Tel Advanced Communications. I'd like to express my
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thanks to all of these good people here, both for working on the code
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and for prodding me into improving it.
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Changes since 3.0 Beta 2 Patchlevel 23
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- Fix a bug in the DNS update code where a status code was not being
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checked. This may have been causing core dumps.
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- When parsing the lease file, if a lease declaration includes a
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billing class statement, and the lease already has a billing class,
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unbill the old class.
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- When processing failover transactions, where acks will be deferred,
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process the state transition immediately.
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- Don't try to use the new SIOCGIFCONF buffer size detection code on
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Linux 2.0, which doesn't provide this functionality.
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- Apply a patch suggested by Tuan Uong for a problem in dlpi.c.
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- Fix a problem in using the which command in the configure script.
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- Fix a parse error in the client when setting up an omapi listener.
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- Document the -n and -g flags to the client.
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- Make sure there is always a stdin and stdout on startup. This
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prevents shell scripts from accidentally writing error messages into
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configuration files that happen to be opened as stderr.
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- If an interface is removed, the client will now notice that it is
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gone rather than spinning. This has only been tested on NetBSD.
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- The client will attempt to get an address even if it can't create a
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lease file.
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- Don't overwrite tracefiles.
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- Fix some memory allocation bugs in failover.
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Changes since 3.0 Beta 2 Patchlevel 22
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- Apply some patches suggested by Cyrille Lefevre, who is maintaining
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the FreeBSD ISC DHCP Distribution port.
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- Fix a core dump in DHCPRELEASE.
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Changes since 3.0 Beta 2 Patchlevel 21
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- This time for sure: fix the spin described in the changes for pl20.
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Changes since 3.0 Beta 2 Patchlevel 20
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- Fix a problem with Linux detecting large numbers of interfaces (Ben)
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- Fix a memory smash in the quotify code, which was introduced in
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pl19.
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- Actually fix the spin described in the changes for pl20. The
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previous fix only partially fixed the problem - enough to get it
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past the regression test.
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Changes since 3.0 Beta 2 Patchlevel 19
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- Fix a bug that could cause the server to abort if compiled with
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POINTER_DEBUG enabled.
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- Fix a bug that could cause the server to spin when responding to a
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DHCPREQUEST.
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- Apply Joost Mulders' suggested patches for DLPI on x86.
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- Support NUL characters in quoted strings.
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- Install unformatted man pages on SunOS.
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Changes since 3.0 Beta 2 Patchlevel 18
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- Allow the server to be placed in partner-down state using OMAPI.
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(Damien Neil)
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- Implement omshell, which can be used to do arbitrary things to the
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server (in theory). (Damien Neil)
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- Fix a case where if a client had two different leases the server could
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actually dereference the second one when it hadn't been referenced,
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leading to memory corruption and a core dump. (James Brister)
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- Fix a case where a client could request the address of another client's
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lease, but find_lease wouldn't detect that the other client had it, and
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would attempt to allocate it to the client, resulting in a lease conflict
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message.
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- Fix a case where a client with more than one client identifier could be
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given a lease where the hardware address was correct but the client
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identifier was not, resulting in a lease conflict message.
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- Fix a problem where the server could write out a colon-seperated
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hex list as a value for a variable, which would then not parse.
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The fix is to always write strings as quoted strings, with any
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non-printable characters quoted as octal escape sequences. So
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a file written the old way still won't work, but new files written
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this way will work.
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- Fix documentation for sending non-standard options.
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- Use unparsable names for unknown options. WARNING: this will
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break any configuration files that use the option-nnn convention.
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If you want to continue to use this convention for some options,
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please be sure to write a definition, like this:
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option option-nnn code nnn = string;
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You can use a descriptive name instead of option-nnn if you like.
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- Fix a problem where we would see a DHCPDISCOVER/DHCPOFFER/
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DHCPREQUEST/DHCPACK/DHCPREQUEST/DHCPNAK sequence. This was the
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result of a deceptively silly bug in supersede_lease.
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- Fix client script exit status check, according to a fix supplied by
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Hermann Lauer.
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- Fix an endianness bug in the tracefile support, regarding ICMP
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messages.
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- Fix a bug in the client where the medium would not work correctly if
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it contained quoted strings.
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** there was no pl17 **
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Changes since 3.0 Beta 2 Patchlevel 16
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- Add support for transaction tracing. This allows the state of the
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DHCP server on startup, and all the subsequent transactions, to be
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recorded in a file which can then be played back to reproduce the
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behaviour of the DHCP server. This can be used to quickly
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reproduce bugs that cause core dumps or corruption, and also for
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tracking down memory leaks.
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- Incorporate some bug fixes provided by Joost Mulders for the DLPI
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package which should clear up problems people have been seeing on
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Solaris.
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- Fix bugs in the handling of options stored as linked lists (agent
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options, fqdn options and nwip options) that could cause memory
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corruption and core dumps.
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- Fix a bug in DHCPREQUEST handling that resulted in DHCPNAK messages
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not being send in some cases when they were needed.
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- Make the lease structure somewhat more compact.
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- Make initial failover startup *much* faster. This was researched
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and implemented by Damien Neil.
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- Add a --version flag to all executables, which prints the program
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name and version to standard output.
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- Don't rewrite the lease file every thousand leases.
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- A bug in nit.c for older SunOS machines was fixed by a patch sent in
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by Takeshi Hagiwara.
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- Fix a memory corruption bug in the DHCP client.
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- Lots of documentation updates.
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- Add a feature allowing environment variables to be passed to the
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DHCP client script on the DHCP client command line.
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- Fix client medium support, which had been broken for some time.
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- Fix a bug in the DHCP client initial startup backoff interval, which
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would cause two DHCPDISCOVERS to be sent back-to-back on startup.
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Changes since 3.0 Beta 2 Patchlevel 15
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- Some documentation tweaks.
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- Maybe fix a problem in the DLPI code.
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- Fix some error code space inconsistencies in ddns update code.
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- Support relay agents that intercept unicast DHCP messages to stuff
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agent options into them.
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- Fix a small memory leak in the relay agent option support code.
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- Fix a core dump that would occur if a packet was sent with no
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options.
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Changes since 3.0 Beta 2 Patchlevel 14
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- Finish fixing a long-standing bug in the agent options code. This
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was causing core dumps and failing to operate correctly - in
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particular, agent option stashing wasn't working. Agent option
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stashing should now be working, meaning that agent options can be
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used in class statements to control address allocation.
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- Fix up documentation.
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- Fix a couple of small memory leaks that would have added up
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significantly in a high-demand situation.
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- Add a log-facility configuration parameter.
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- Fix a compile error on some older operating systems.
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- Add the ability in the client to execute certain statements before
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transmitting packets to the server. Handy for debugging; not much
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practical use otherwise.
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- Don't send faked-out giaddr when renewing or bound - again, useful
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for debugging.
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Changes since 3.0 Beta 2 Patchlevel 13
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- Fixed a problem where the fqdn decoder would sometimes try to store
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an option with an (unsigned) negative length, resulting in a core
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dump on some systems.
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- Work around the Win98 DHCP client, which NUL-terminates the FQDN
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option.
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- Work around Win98 and Win2k clients that will claim they want to do
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the update even when they don't have any way to do it.
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- Fix some log messages that can be printed when failover is operating
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that were not printing enough information.
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- It was possible for a DHCPDISCOVER to get an allocation even when
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the state machine said the server shouldn't be responding.
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- Don't load balance DHCPREQUESTs from clients in RENEWING and
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REBINDING, since in RENEWING, if we heard it, it's for us, and in
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REBINDING, the client wouldn't have got to REBINDING if its primary
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were answering.
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- When we get a bogus state lease binding state transition, don't do
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the transition.
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Changes since 3.0 Beta 2 Patchlevel 12
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- Fixed a couple of silly compile errors.
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Changes since 3.0 Beta 2 Patchlevel 11
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- Albert Herranz tracked down and fixed a subtle bug in the base64
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decoder that would prevent any key with an 'x' in its base64
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representation from working correctly.
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- Thanks to Chris Cheney and Michael Sanders, we have a fix for the
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hang that they both spotted in the DHCP server - when
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one-lease-per-client was set, the code to release the "other" lease
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could spin.
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- Fix a problem with alignment of the input buffer in bpf in cases
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where two packets arrive in the same bpf read.
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- Fix a problem where the relay agent would crash if you specified an
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interface name on the command line.
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- Add the ability to conditionalize client behaviour based on the
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client state.
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- Add support for the FQDN option, and added support for a new way of
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doing ddns updates (ddns update style interim) that allows more than
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one DHCP server to update the DNS for the same network(s). This
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was implemented by Damien Neil with some additional functionality
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added by Ted Lemon.
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- Damien added a "log" statement, so that the configuration file can
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be made to log debugging information and other information.
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- Fixed a bug that caused option buffers not to be terminated with an
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end option.
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- Fixed a long-standing bug in the support for option spaces where the
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options are stored as an ordered list rather than in a hash table,
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which could theoretically result in memory pool corruption.
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- Prevent hardware declarations with no actual hardware address from
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being written as something unparsable, and behave correctly in the
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face of a null hardware address on input.
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- Allow key names to be FQDNs, and qualify the algorithm name if it is
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specified unqualified.
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- Modify the DDNS update code so that it never prints the "resolver
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failed" message, but instead says *why* the resolver failed.
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- Officially support the subnet selection option, which now has an
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RFC.
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- Fix a build bug on MacOS X.
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- Allow administrator to disable ping checking.
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- Clean up dhcpd.conf documentation and add more information about how
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it works.
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Changes since 3.0 Beta 2 Patchlevel 10
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- Fix a bug introduced during debugging (!) and accidentally committed
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to CVS.
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Changes since 3.0 Beta 2 Patchlevel 9
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- Fix DHCP client handling of vendor encapsulated options.
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- Fix a bug in the handling of relay agent information options introduced
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in patchlevel 9.
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- Stash agent options on client leases by default, and use the stashed
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options at renewal time.
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- Add the ability to test the client's binding state in the client
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configuration language.
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- Fix a core dump in the DNS update code.
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- Fix some expression evaluation bugs that were causing updates to be
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done when no client hostname was received.
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- Fix expression evaluation debugging printfs.
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- Teach pretty_print_option to print options in option spaces other than
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the DHCP option space.
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- Add a warning message if the RHS of a not is not boolean.
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- Never select for more than a day, because some implementations of
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select will just fail if the timeout is too long (!).
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- Fix a case where a DHCPDISCOVER from an unknown network would be
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silently dropped.
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- Fix a bug where if a client requested an IP address for which a different
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client had the lease, the DHCP server would reallocate it anyway.
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- Fix the DNS update code so that if the client changes its name, the DNS
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will be correctly updated.
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Changes since 3.0 Beta 2 Patchlevel 8
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- Oops, there was another subtle math error in the header-length
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bounds-checking.
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Changes since 3.0 Beta 2 Patchlevel 7
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- Oops, forgot to byte-swap udp header length before bounds-checking it.
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Changes since 3.0 Beta 2 Patchlevel 6
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- Fix a possible DoS attack where a client could cause the checksummer
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to dump core. This was a read, not a write, so it shouldn't be
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possible to exploit it any further than that.
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- Implement client- and server-side support for using the Client FQDN
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option.
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- Support for other option spaces in the client has been added. This
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means that it is now possible to define a vendor option space on the
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client, request options in that space from the server (which must
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define the same option space), and then use those options in the
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client. This also allows NWIP and Client FQDN options to be used
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meaningfully.
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- Add object initializer support. This means that objects can now be
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initialized to something other than all-zeros when allocated, which
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makes, e.g., the interface object support code a little more robust.
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- Fix an off-by-one bug in the host stuffer. This was causing host
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deletes not the work, and may also have been causing OMAPI
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connections to get dropped. Thanks to James Brister for tracking
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this one down!
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- Fixed a core dump in the interface discovery code that is triggered
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when there is no subnet declaration for an interface, but the server
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decides to continue running. Thanks to Shane Kerr for tracking
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down and fixing this problem.
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Changes since 3.0 Beta 2 Patchlevel 5
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- Fix a bug in the recent enhancement to the interface discovery code
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to support arbitrary-length interface lists.
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- Support NUL-terminated DHCP options when initializing client-script
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environment.
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- Fix suffix operator.
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- Fix NetWare/IP option parsing.
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- Better error/status checking in dhcpctl initialization and omapi
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connection code.
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- Fix a potential memory smash in dhcpctl code.
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- Fix SunOS4 and (maybe) Ultrix builds.
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- Fix a bug where a certain sort of incoming packet could cause a core
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dump on Solaris (and probably elsewhere).
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- Add some more safety checks in error logging code.
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- Add support for ISC_R_INCOMPLETE in OMAPI protocol connection code.
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- Fix relay agent so that if an interface is specified on the command
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line, the relay agent does not dump core.
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- Fix class matching so that match if can be combined with match or
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spawn with.
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- Do not allow spurious leases in the lease database to introduce
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potentially bogus leases into the in-memory database.
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- Fix a byte-order problem in the client hardware address type code
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for OMAPI.
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- Be slightly less picky about what sort of hardware addresses OMAPI
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can install in host declarations.
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Changes since 3.0 Beta 2 Patchlevel 4
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- Incorporated Peter Marschall's proposed change to array/record
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parsing, which allows things like the slp-agent option to be encoded
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correctly. Thanks very much to Peter for taking the initiative to
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do this, and for doing such a careful job of it (e.g., updating the
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comments)!
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- Added an encoding for the slp-agent option. :')
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- Fixed SunOS 4 build. Thanks to Robert Elz for responding to my
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request for help on this with patches!
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- Incorporated a change that should fix a problem reported by Philippe
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Jumelle where when the network connection between two servers is
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lost, they never reconnect.
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- Fix client script files other than that for NetBSD to actually use
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make_resolv_conf as documented in the manual page.
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- Fix a bug in the packet handling code that could result in a core
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dump.
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- Fix a bug in the bootp code where responses on the local net would
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be sent to the wrong MAC address. Thanks to Jerry Schave for
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catching this one.
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Changes since 3.0 Beta 2 Patchlevel 3
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- In the DHCP client, execute client statements prior to using the values
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of options, so that the client configuration can overried, e.g., the
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lease renewal time.
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- Fix a reference counting error that would result in very reproducible
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failures in updates, as well as occasional core dumps, if a zone was
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declared without a key.
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- Fix some Linux 2.0 compilation problems.
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- Fix a bug in scope evaluation during execution of "on" statements that
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caused values not to be recorded on leases.
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- If the dhcp-max-message-size option is specified in scope, and the
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client didn't send this option, use the one specified in scope to
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determine the maximum size of the response.
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Changes since 3.0 Beta 2 Patchlevel 2
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- Fix a case where spawning subclasses were being allocated
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incorrectly, resulting in a core dump.
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- Fix a case where the DHCP server might inappropriately NAK a
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RENEWING client.
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- Fix a place dhcprequest() where static leases could leak.
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- Include memory.h in omapip_p.h so that we don't get warnings about
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using memcmp().
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Changes since 3.0 Beta 2 Patchlevel 1
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- Notice when SIOCFIGCONF returns more data than fit in the buffer -
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allocate a larger buffer, and retry. Thanks to Greg Fausak for
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pointing this out.
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- In the server, if no interfaces were configured, report an error and
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exit.
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- Don't ever record a state of 'startup'.
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- Don't try to evaluate the local failover binding address if none was
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specified. Thanks to Joseph Breu for finding this.
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