relnotes

DHCP服务器源码

- Delete the FTS_BOOTP and FTS_RESERVED states and implement them
  as modifier flags to the FTS_ACTIVE state, as called for in the
  failover protocol standard.

- Fix bugs in the pool merging code that resulted in references and
  dereferences of null pointers.   This bug had no impact unless the
  POINTER_DEBUG flag was defined.

- In the server, added a do-forward-updates flag that can be used to
  disable forward updates in all cases, so that sites that want the
  clients to take sole responsibility for updating their A record can
  do so.

- Make it possible to disable optimization of PTR record updates.

			Changes since 3.0.1rc5

- Include some new documentation and changes provided by Karl Auer.

- Add a workaround for some Lexmark printers that send a double-NUL-
  terminated host-name option, which would break DNS updates.

- Fix an off-by-one error in the MAC-address checking code for
  DHCPRELEASE that was added in 3.0.1rc5.

- Fix a bug where client-specific information was not being discarded
  from the lease when it expired or was released, resulting in
  problems if the lease was reallocated to a different client.

- If more than one allocation pool is specified that has the same set
  of constraints as another allocation pool on the same shared
  network, merge the two pools.

- Don't print an error in fallback_discard, since this just causes
  confusion and does not appear to be helping to encourage anyone to
  fix this bug.

			Changes since 3.0.1rc4

- Fix a bug that would cause the DHCP server to spin if asked to parse
  a certain kind of incorrect statement.

- Fix a related bug that would prevent an error from being reported in
  the same case.

- Additional documentation.

- Make sure that the hardware address matches the lease when
  processing a DHCPRELEASE message.

			Changes since 3.0.1rc3

- A minor bug fix in the arguments to a logging function call.
- Documentation update for dhcpd.conf.

		        Changes since 3.0.1rc2

- Allow the primary to send a POOLREQ message.   This isn't what the current
  failover draft says to do, so we may have to back it out if I can't get the
  authors to relent, but the scheme for balancing that's specified in the
  current draft seems needlessly hairy, so I'm floating a trial balloon.
  The rc1 code did not implement the method described in the draft either.

		        Changes since 3.0.1rc1

- Treat NXDOMAIN and NXRRSET as success when we are trying to delete a
  domain or RRSET.   This allows the DHCP server to forget about a name
  it added to the DNS once it's been removed, even if the DHCP server
  wasn't the one that removed it.

- Install defaults for failover maximum outstanding updates and maximum
  silent time.   This prevents problems that might occur if these values
  were not configured.

- Don't do DDNS deletes if ddns-update-style is none.

- Return relay agent information options in DHCPNAK.   This prevents DHCPNAK
  messages from being dropped when the relay agent information option contains
  routing information.

- Fix a problem where coming up in recover wouldn't result in an update
  request being sent.

- Add some more chatty messages when we start a recovery update and when it's
  done.

- Fix a possible problem where some state might have been left around
  after the peer lost contact and regained contact about how many updates
  were pending.

- Don't nix a lease update because of a lease conflict.   This test has
  never (as far as I know) prevented a mistake, and it appears to cause
  problems with failover.

- Add support in rc history code for keeping a selective history, rather
  than a history of all references and dereferences.   This code is only used
  when extensive additional debugging is enabled.

		           Changes since 3.0

- Make allocators for hash tables.   As a side effect, this fixes a memory
  smash in the subclass allocation code.

- Fix a small bug in omshell where if you try to close an object when
  no object is open, it dumps core.

- Fix an obscure coredump that could occur on shutdown.

- Fix a bug in the recording of host declaration rubouts in the lease file.

- Fix two potential spins in the host deletion code.

- Fix a core dump that would happen if an application tried to update
  a host object attribute with a null value.

		Changes since 3.0 Release Candidate 12

- Fix a memory leak in the evaluation code.

- Fix an obscure core dump.

- Print a couple of new warnings when parsing the configuration file
  when crucial information is left out.

- Log "no free leases" as an error.

- Documentation updates.

		Changes since 3.0 Release Candidate 11

- Always return a subnet selection option if one is sent.

- Fix a warning that was being printed because an automatic data
  structure wasn't zeroed.

- Fix some failover state transitions that were being handled
  incorrectly.

- When supersede_lease is called on a lease whose end time has already
  expired, but for which a state transition has not yet been done, do
  a state transition.   This fixes the case where if the secondary
  allocated a lease to a client and the lease "expired" while the
  secondary was in partner-down, no expiry event would actually
  happen, so the lease would remain active until the primary was
  restarted.

		Changes since 3.0 Release Candidate 10

- Fix a bug that was preventing released leases from changing state
  in failover-enabled pools.

- Fix a core dump in the client identifier finder code (for host
  declarations).

- Finish fixing a bug where bogus data would sometimes get logged to
  the dhclient.leases file because it was opened as descriptor 2.

- Fix the Linux dhclient-script according to suggestions made by
  several people on the dhcp-client mailing list.

- Log successful DNS updates at LOG_INFO, not LOG_ERROR.

- Print an error message and refuse to run if a failover peer is
  defined but not referenced by any pools.

- Correct a confusing error message in failover.

		Changes since 3.0 Release Candidate 9

- Fix a bug in lease allocation for Dynamic BOOTP clients.

	  Changes since 3.0 Release Candidate 8 Patchlevel 2

- Fix a bug that prevented update-static-leases from working.

- Document failover-state OMAPI object.

- Fix a compilation error on SunOS 4.

	  Changes since 3.0 Release Candidate 8 Patchlevel 1

- Fix a parsing bug that broke dns updates (both interim and ad-hoc).
  This was introduced in rc8pl1 as an unintended result of the memory
  leakage fixes that were in pl1.

- Fix a long-standing bug where the server would record that an update
  had been done for a client with no name, even though no update had
  been done, and then when the client's lease expired the deletion of
  that nonexistant record would time out because the name was the null
  string. 

- Clean up the omshell, dhcpctl and omapi man pages a bit.

		Changes since 3.0 Release Candidate 8

- Fix a bug that could cause the DHCP server to spin if
  one-lease-per-client was enabled.

- Fix a bug that was causing core dumps on BSD/os in the presence of
  malformed packets.

- In partner-down state, don't restrict lease lengths to MCLT.

- On the failover secondary, record the MCLT received from the primary
  so that if we come up without a connection to the primary we don't
  wind up giving out zero-length leases.

- Fix some compilation problems on BSD/os.

- Fix a bunch of memory leaks.

- Fix a couple of bugs in the option printer.

- Fix an obscure error reporting bug in the dns update code, and also
  make the message clearer when a key algorithm isn't supported.

- Fix a bug in the tracing code that prevented trace runs that used
  tcp connections from being played back.

- Add some additional debugging capability for catching memory leaks
  on exit.

- Make the client release the lease correctly on shutdown.

- Add some configurability to the build system.

- Install omshell manual page in man1, not man8.

- Craig Gwydir sent in a patch that fixes a long-standing bug in the
  DHCP client that could cause core dumps, but that for some reason
  hadn't been noticed until now.

		Changes since 3.0 Release Candidate 7

- Fix a bug in failover where we weren't sending updates after a
  transition from communications-interrupted to normal.

- Handle expired/released/reset -> free transition according to the
  protocol specification (this works - the other way not only wasn't
  conformant, but also didn't work).

- Add a control object in both client and server that allows either
  daemon to be shut down cleanly.

- When writing a lease, if we run out of disk space, shut down the
  output file and insist on writing a new one before proceeding.

- In the server, if the OMAPI listener port is occupied, keep trying
  to get it, rather than simply giving up and exiting.

- Support fetching variables from leases and also updating and adding
  variables to leases via OMAPI.

- If two failover peers have wildly different clocks, refuse to start
  doing failover.

- Fix a bug in the DNS update code that could cause core dumps when
  running on alpha processors.

- Fixed a bug in ddns updates for static lease entries, thanks to a
  patch from Andrey M Linkevitch.

- Add support for Darwin/MacOS X

- Install omshell (including new documentation).

- Support DNS updates in the client (this is a very obscure feature
  that most DHCP client users probably will not be able to use).

- Somewhat cleaner status logging in the client.

- Make OMAPI key naming syntax compatible with the way keys are
  actually named (key names are domain names).

- Fix a bug in the lease file writer.

- Install DHCP ISC headers in a different place than BIND 9 ISC
  headers, to avoid causing trouble in BIND 9 builds.

- Don't send updates for attributes on an object when the attributes
  haven't changed.   Support deleting attributes on remote objects.

- Fix a number of bugs in omshell, and add the unset and refresh
  statements.

- Handle disconnects in OMAPI a little bit more intelligently (so that
  the caller gets ECONNRESET instead of EINVAL).

- Fix a bunch of bugs in the handling of clients that have existing
  leases when the try to renew their leases while failover is
  operating.

		Changes since 3.0 Release Candidate 6

- Fix a core dump that could happen when processing a DHCPREQUEST from
  a client that had a host declaration that contained both a
  fixed-address declaration and a dhcp-client-identifier option
  declaration, if the client identifier was longer than nine bytes.

- Fix a memory leak that could happen in certain obscure cases when
  using omapi to manipulate leases.

- Fix some bugs and omissions in omshell.


		Changes since 3.0 Release Candidate 5

- Fix a bug in omapi_object_dereference that prevented objects in
  chains from having their reference counts decreased on dereference.

- Fix a bug in omapi_object_dereference that would prevent object
  chains from being freed upon removal of the last reference external
  to the chain.

- Fix a number of other memory leaks in the OMAPI protocol subsystem.

- Add code in the OMAPI protocol handler to trace memory leakage.

- Clean up the memory allocation/reference history printer.

- Support input of dotted quads and colon-separated hex lists as
  attribute values in omshell.