570 lines
20 KiB
Plaintext
570 lines
20 KiB
Plaintext
Internet Software Consortium
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Dynamic Host Configuration Protocol Distribution
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Version 2, Beta 1, Patchlevel 18
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March 5, 1998
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Release Notes
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This is the first Beta release of Version 2 of the Internet Software
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Consortium DHCP Distribution. This beta is believed to be fairly
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stable.
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PLANS
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Version 1 of the ISC DHCP Distribution includes just a DHCP Server.
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Version 1 has been in feature freeze since late 1996, and is quite
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stable. This is the release that we would expect very conservative
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sites to run in production, but it is no longer recommended.
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Version 2 of the ISC DHCP Distribution adds a DHCP Client and a
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DHCP/BOOTP Relay Agent to the DHCP Server that was offered in version
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1.0. In addition, some new capabilities have been added to the
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server:
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- IP addresses are now tested before they are assigned to
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clients. This allows the DHCP server to detect rogue
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machines that may have hijacked IP addresses before an IP
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address conflict can occur.
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- The server may be configured so that some DHCP clients can
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be excluded from booting.
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- Improved NAKing behaviour, so that clients that are using
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addresses other than the one the server knows they should be
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using are disciplined quickly.
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This version has been in a near feature freeze since January of 1998,
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has been in Beta test since then, and is planned for final release in
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mid-1999. It has a number of important features, and is the release
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that we would expect most sites to run. It is possible to run the
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Version 1 server with the Version 2 client at sites that want to be
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really conservative.
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Version 3 of the ISC DHCP Distribution will add conditional behaviour,
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client classing, Dynamic DNS Support, DHCPv4 16-bit option codes,
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asynchronous DNS query resolution, DHCP Authentication, and possibly
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support for a DHCP Interserver Protocol and live querying of the DHCP
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database. Currently, only client classing and conditional behaviour
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have been implemented - the DNS code is waiting for an enhanced DNS
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resolver. The code has gone through a major internal restructuring
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which will help to support wider option codes, and possibly IPv6, as
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well as a more sensible memory allocation strategy. This release is
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running in producion at the ISC, but is not expected to be stable in
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the near future, and is intended for sites that are in a position to
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experiment, or for sites that desperately need the new features.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 17
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- Fix a bug in the relay agent where messages to the client would be
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unicast in the IP header but broadcast in the link header. The
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Microsoft DHCP client would reject such packets, preventing it from
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being configured. This was only a problem on non-socket-API
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platforms.
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- Do not attempt to reclaim requested abandoned leases in response to
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DHCPDISCOVER messages.
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- Allow the maximum lease time parameter in a host declaration to
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override the maximum lease time parameter in a subnet declaration.
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- Better document the -p flag for dhclient, dhcrelay and dhcpd.
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- Apply John Wehle's patch to fix the endianness bug in the dlpi
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packet filter on Solaris.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 16
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- Fix linux man page install location.
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- Fix some confusion in the dhclient-script man page.
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- Fix error in includes/cf/linux.h that would have made network API
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selections in site.h work incorrectly.
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- Fix some major stupidity in the code that figures out where or not a
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client owns a particular lease.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 15
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- Fix Makefile.conf on Linux to refer to /var/state/dhcp instead of
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/var/state/dhcpd.
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- Eliminate redundant #defines in includes/cf/linux.h (for neatness).
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- Fix an obscure case where dhcpd is started by the /etc/rc system
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with exactly the same pid each time, dhcpd.pid is not erased on
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reboot, and therefore dhcpd would detect a server (itself) with the
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pid in dhcpd.pid and decide that another server was running and
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exit.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 14
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- Install the dhcp databases in /var/state/dhcp instead of /etc or
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/var/dhcpd, as suggested in the Linux Filesystem Hierarchy
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Standard.
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- Fix an endianness bug in dlpi.c. As a consequence, make the
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Solaris/i386 use dlpi again.
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- Fix a bunch of bugs in the Solaris client script.
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- Add some more information about Solaris to the README file.
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- Adjust startup message in interface probe so that the relay agent
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and client's unattached status will not trigger questions.
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- Update some error messages to provide more help to new users for
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some common mistakes.
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- Create an interface alias on Solaris when setting up IP aliases,
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rather than trying to do things the *BSD way.
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- Fix a null pointer dereference bug (this time I went through the
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whole function and audited it for more null pointer dereferences,
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and I didn't find any, for what that's worth).
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- Don't ever release leases in response to a DHCPDISCOVER (I think
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this was unlikely anyway, but why not be correct?).
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- Remove the shared-network example from the sample dhcpd.conf file.
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- Make ``make install'' make all first.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 13
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- Support DESTDIR on installs.
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- Fix a bug in dhcp.c where a store through a null pointer would
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be made under some reasonably common circumstances.
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- Add test for ARPHRD_TUNNEL so that client and server do not fail on
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versions of Linux running IPsec implementations or the like.
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- Move tests for constants defined in O.S. headers into osdep.h - test
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for HAVE_whatever in .c files. Define relevant HAVE_whatevers in
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linux.h, so that versions of linux that define these constants as
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enums will still work.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 12
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- Initialize the "quiet" variable in dhclient.c to zero (it was used
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without first having been initialized).
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- Fix the parser code for the authoritative keyword.
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- Adjust lease discovery code to NAK more aggressively for addresses
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the server knows it owns.
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- Add several new messages for DHCPNAK.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 11
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- Use DLPI only on sparcs running Solaris, since it seems not to work
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on i386 boxes running Solaris for reasons yet to be determined.
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- In the client, close standard I/O descriptors when forking a daemon.
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- Don't let large lease lengths wrap lease expiry times - just use
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what fits into a TIME value.
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- Fix a bug in the SIOCGIFCONF interface scanning code.
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- Fix a core dump in the interface scanner that crops up on Linux when
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an interface is specified on the command line.
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- Don't use %D in strftime because egcs complains about it.
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- Print the error message if SO_BINDTODEVICE fails.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 10
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- Update top-level Makefile so that it exits correctly on errors in
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submakes under bash/gnu make (dunno which is the culprit, and don't
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really care).
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- Print a more helpful message if no free BPF devices are found.
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- Add support for specifying that the server is or is not
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authoritative for a particular network segment.
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- Fix two stupid typos in lpf.c.
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- Print a more helpful message if we can't create an LPF socket or
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can't attach a filter to it.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 9
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- Correct the hopelessly outdated information about Linux at the top
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of the README - many apologies to the Linux people who have had to
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read that nonsense for the past couple of snapshots and have been
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confused or annoyed by it. I simply hadn't read it recently, and
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didn't realize how out-of-date it was.
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- Print a message if the client finds no broadcast interfaces to
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configure.
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- Add support for use-lease-addr-for-default-route flag in server, so
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that Windows machines can be made to ARP for all addresses.
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- Update README file to mention new Linux gotchas.
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- After finally understanding Brian Murrel's code (my fault, not his)
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to get interface names from /proc/net/dev on Linux, fix what I broke
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of his code and document it.
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- Use sendto rather than send for SOCK_PACKET sockets, because they
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can't be connected, only bound. :'(
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- Fix up SOCK_PACKET creation so that the kernel doesn't complain
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about it.
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- Fix incorrect tests in linux client script:
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[ $relmajor == 2 ] -> [ $relmajor -eq 2 ]
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- Make typedefs for u8, u16 and u32 types. These are Linux kernel
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internal data types which are unfortunately exposed in the linux
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packetfilter header file.
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- Don't include <net/ethernet.h> in lpf.c - it defines things we're
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already correctly defining elsewhere, and doesn't define any useful
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new stuff.
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- Finally fix client PREINIT bug that causes interfaces not specified
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on the command line to be preinitialized. If no interfaces are
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specified on the command line, all interfaces are still
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preinitialized.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 8
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- Fix socket API fallback setup code, which was causing Linux servers
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and clients to loop endlessly on select when run as daemons.
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- Add support for Linux 2.2 version number (treated the same as Linux
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2.1, for now).
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- Correct apparent error in DHCPREQUEST destination address handling
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when in INIT-REBOOT state.
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- Do not set BROADCAST flag if we have a valid IP address.
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- Remove hard-coded filenames and use system-specific manifest
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constants.
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- Add entry and exit hooks to Linux dhclient-script (should be added
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to all operating systems once tested).
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- Test for linux major and minor version so as to correctly invoke
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network configuration programs.
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- Add support for Linux's gratuitous name change of bpf_insn structure
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(can't pollute precious Linux sources with the "Berkeley" word, I
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guess.
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- Correct USE_BPF_{SEND,RECEIVE} ifdefs for if_reinitialize_*
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functions.
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- Ensure that we have ifreq structure before initializing interface -
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if an interface was specified on the command line on Linux, this was
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not the case.
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- Get rid of references to enstamp structure in lpf.c. Correctly
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declare and initialize sock_fprog structure (aka bpf_filter
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structure on non-Linux machines).
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- Define ssize_t on Ultrix.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 7
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- Generalize FDDI support.
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- Fix potential core dump in interface discovery code.
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- Put explicit release versions on startup messages.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 6
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- Add support for Linux Packet Filter (thanks to Brian Murrell, Interlinx).
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- Add support for FDDI hardware type.
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- Fix a long-standing bug in DLPI support where the ethertype was
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being set incorrectly (thanks to Gong Wei, CCENet).
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- Don't use DLPI RAW mode on Solaris.
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- In the client, when a lease expires, the interface to which that
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lease is attached is unconfigured. On systems that use the socket
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API, the interface needs to then be reconfigured with the 0.0.0.0
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address so that it can be used to get a new address.
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- Add fallback support for Linux. This fixes a problem with the
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relay agent when relaying over non-broadcast links, and may also fix
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some obscure problems with unicasting DHCPACKs in both the server and
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relay agent.
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- When allocating leases, if the oldest lease is abandoned, try to
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find a younger-but-still-expired lease rather than reclaiming the
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abandoned lease.
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- Add more documentation to README.
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- The absence of the /etc/dhclient.conf file is no longer considered
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an error.
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- The dhcp client's lease file name can be specified on the command
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line.
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- The DHCP client should no longer zap interfaces that it has not been
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directed to configure.
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- If a client starts up in the init-reboot state, the xid will be a
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"random" number rather than always being zero, as was previously the
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case.
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- In addition to comparing transaction IDs, compare hardware addresses
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in response packets to verify that they are ours.
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- Rewrite the client lease database after 20 leases have been written.
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- Fix the exponential backoff code.
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- Add a Y2k comment to indicate that something suspicious-looking is
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in fact _not_ a problem.
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- Use mkstemp if possible.
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- Add missing fi in various client scripts.
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- Use "search" instead of "domain" in linux resolv.conf files.
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- Specify a hop count in all route command on solaris.
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- If an allocation fails, don't try to zero out the allocation buffer
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we didn't get.
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- Support subnets that are subsets of other subnets - that is, for
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example, 10.0.1.0/24 and 10.0.0.0/16. This is useful in fairly
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obscure circumstances.
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- Don't set the lease end time if it's already expired.
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- Don't define INADDR_LOOPBACK on FreeBSD if it's already defined in a
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system header.
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- Use the broadcast address in the relay agent if we are using the BSD
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socket API.
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- Allow host declarations without names.
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- Allow the server identifier option to be specified.
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- Don't dump hostnames into the lease file if they contain
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non-printable characters.
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- Copy the entire client hardware address buffer that the client sends
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to the output packet, not just the portion of it that's supposedly
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significant according to the hardware address length field. This
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is done for the benefit of certain Microsoft clients.
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- Don't send a second ICMP echo request if we receive two DHCPDISCOVER
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messages in quick succession. This prevents a rather annoying
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timing race in configuring some Win95 clients.
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- Fix up dhcp-options man page to make it more readable. Note that
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netbios-name-server is the same thing as WINS.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 5
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- Define some extra DLPI support flags that make DLPI work much better
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on Solaris.
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- Fix inet_aton prototype/declaration to match Internet Software
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Consortium BIND distribution.
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- Document new server-identifier functionality.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 4
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- Do not use -Wstrict-prototypes on Solaris with gcc - if the Internet
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Software Consortium BIND distribution is not installed, this produces
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errors.
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- Actually use the new DLPI support on Solaris - although the code was
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added in Patchlevel 2, it wasn't enabled (blush).
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- Fix a prototype bug that's exposed when DLPI support is enabled on
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Solaris.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 3
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- Fix a makefile botch that prevents the DHCP Distribution from
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from compiling on Solaris with gcc. Sigh.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 2
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- Allow server-identifier in any scope. Use in-scope server
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identifier option rather than the default, if one exists.
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- Delete newlines from abandoned lease reclaimation warning.
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- Only release other applicable leases held by a client when the
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client sends a DHCPREQUEST.
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- Fix core dump when find_lease didn't find a lease.
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- Update dhcpd.leases man page.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 1
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- Use -Wno-char-subscript on Solaris to prevent bogus warnings from
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gcc on Solaris 2.6.
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- Add support for Apple's new Rhapsody operating system.
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- Use DLPI on Solaris instead of using the BSD Sockets API.
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- Fix two network input buffer overflow problems which could allow an
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attacker to pervert the stack.
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- Fix an ancient typo that could theoretically cause memory
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corruption.
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- Sort abandoned leases in at current time rather than end of time.
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This allows abandoned leases to be reclaimed if there are no
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available free leases.
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- If a client explicitly requests a lease that's been abandoned, it's
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probably the system that was answering pings on that address, so let it
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have the lease.
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- Fix a bunch of type conversion errors that are flagged by the Solaris
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C compiler.
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CHANGES FROM VERSION 2.0 BETA 1 PATCHLEVEL 0
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- Fix two potential buffer overflow problems.
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- Differentiate between versions of Linux for better success in
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compiling.
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- Fix bug in linux client script regarding routing setup.
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- Clarify socket API error message on multiple interfaces.
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- Fix broken comparison that was setting IP source address to zero.
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- Reclaim abandoned leases if we run out of free leases.
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CHANGES FROM THE DECEMBER 2, 1997 SNAPSHOT
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- Use %ld to print pid_t and cast pid_t values to long to avoid
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inconsistent declarations between different POSIX flavours.
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- Add support for ARPHRD_IEEE802 (token ring) hardware type.
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- If we own an address and a client requests it, but we can't assign
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it to that client, we now NAK it so that the client doesn't try to
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reuse it.
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CHANGES FROM THE JUNE SNAPSHOT
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- Support for NeXTstep 3.x and 4.x
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- Added man pages for dhcpd.leases, dhclient-script, dhclient.leases
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and dhclient.conf. Move general documentation of DHCP options into
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a seperate man page which is referred to by the dhclient.conf and
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dhcpd.conf man pages.
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- Updated README to answer some frequently asked questions.
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- Fixed a bug in command-line interface specification in dhclient - it
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was formerly not possible to specify that only certain interfaces be
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configured.
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- Do not leave client scripts lying around in /tmp after they've been
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used unless the -D flag is specified.
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- Add a new, non-standard, not-guaranteed-to-stay-the-same system
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configuration status message server which can be used to trigger the
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client to recheck its address, e.g., after a laptop has been put to
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sleep and then awakened (this has yet to be documented).
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- Fix handling of media selection in the REBOOT phase - previously the
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media type would not be remembered, which could cause severe delays
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in reacquiring an address if the default media type was wrong.
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- Allocate space for a NUL terminator on the end of client options -
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this was previously overlooked, and could cause garbage characters
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to be written to the temporary client script files.
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- Use mkstemp if it's available.
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- Supply network number and broadcast address to the client script so
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that on systems that need these values, they don't need to be
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computed with an awk script.
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- Keep a PID file for the client and the relay agent, and have the
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relay agent background itself by default.
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- Add client script for bsd/os, fix many niggling bugs in existing
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client scripts and add support for static routing tables to all bsd
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scripts.
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- Add a -q option to the client, server and relay agent so that they
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can be started from /etc/rc scripts without spewing a bunch of
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garbage on the console. By default, all three daemons still print
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startup messages, since these are helpful in bug reporting.
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- Don't print anything to stderr or stdout after going into
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background.
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- Fix bug where hostname keyword was not being recognized in
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dhcpd.leases file, resulting in the loss of lease database entries.
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- Fix problem on some operating systems where zero-length ifreq
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structures were being offset incorrectly when scanning the interface
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list on startup.
|
|
|
|
- Unless a BOOTP client requests it, never send more than 64 bytes of
|
|
options.
|
|
|
|
- Don't ping static leases, since we don't have a lease structure on
|
|
the heap to work with later.
|
|
|
|
- Fixed a compile problem on Solaris 2.6.
|
|
|
|
- Support interface aliases on Solaris.
|
|
|
|
- Print day and month with leading zero in lease files if less than
|
|
ten, for easier parsing by perl/sed/awk scripts.
|
|
|
|
- Never make the lease database world writable, even if dhcpd is
|
|
invoked with a bogus umask.
|
|
|
|
- Fix DHCPRELEASE handling (before, addressed would never be
|
|
released.)
|
|
|
|
- If there is more than one lease for a particular client on a
|
|
particular network, find the lease the client is asking for so as to
|
|
avoid a cycle of NAKs.
|
|
|
|
- If a BOOTP request is received from a particular client and that
|
|
client has previously received a DHCP address, make sure that we
|
|
still find a valid BOOTP lease so that we don't cycle through
|
|
addresses.
|
|
|
|
- Remove server-identifier option from documentation, other than to
|
|
document that it has been deprecated.
|
|
|
|
- Don't give up if we get an EINTR or EAGAIN while polling or
|
|
selecting - these return statuses can occur spuriously without
|
|
indicating a fatal problem.
|
|
|
|
- Do not select for exceptions, since we don't handle them. This was
|
|
causing massive CPU consumption on some systems.
|
|
|
|
- When a DHCP client has been assigned a fixed address but had
|
|
previously had a lease, it will request the old leased address. In
|
|
such an event, send a DHCPNAK so that it will discover its new
|
|
static binding.
|