4.4BSD/usr/src/contrib/bind-4.9/CHANGES
4.9-FINAL -------------------
Kevin Dunlap sent in some changes for the BOG. So did a lot of other folks.
Someone asked about AXP-OSF, so I did a trivial 64-bit port. Porting to
other 64-bit systems should be simple now. Someone also sent in some MIPS
RISCOS portability changes, which were simple and therefore were put in.
Note that some type names have been added to BSD 4.4 as a result of this
work; they are going to be in <sys/types.h> in BSD 4.4 but they are in a
local include file called <sys/bitypes.h> in this distribution, with
appropriate #ifdef's in the include files that depend on them. Those of you
who are porting to 64-bit platforms where "long" isn't 32 bits should be
using these new names for your types; there was no standard before this,
but the names we've added for BIND 4.9 and BSD 4.4 are going to be proposed
to Posix at some point. Sometimes it's just not OK for "int" to be the
"natural integer size of the machine" and you just _have_ to tell the compiler
how many bits you want.
The NIC added a new root server, thus pushing the size of a nonauthoritative
root server response (which includes the root server list in the answer as
well as the authority sections) over the 512-byte limit. This showed up a
long-term BIND bug wherein it failed to set the TC ("truncation occurred")
bit if truncation occurred anywhere but the answer section. Since truncation
was occuring at the end of the packet, in the additional data section, this
meant that BIND was generating truncated responses without setting TC in the
response header. Upon further investigation, I found that BIND ignored TC
on responses it received from other name servers. RFC 1035 states that RR's
from truncated responses should not be cached; with creative interpretation
of the exact 1035 wording, I found a way to reach this goal while still
caching the answer section (as long as the truncation occurred in some other
section, which 1035 gives no definitive way to determine but I'm happy with
my guess).
While researching the above, I finally broke down and added credibility
output to the zone dump files. They are in the comments so should cause
no trouble. There's more work to be done on the dump output; in particular,
Phil Almquist proposed and even prototyped a "tagging" of all RR's with the
A RR of the nameserver that sent them to us; this feature should be added
and the dump output should include it. This would add a lot to our ability
to track down corrupt data.
Don Lewis and I had more discussions about TC and ended up agreeing that the
right thing to do is to set TC on responses that overflow in the answer or
authority section, truncating at an RR boundary, but do not set TC on responses
that overflow in the additional-data section (truncating at a {name,type}
boundary). This actually solves the root server problem pretty well, since
BIND 4.9 will, when it tries to use an NS whose A isn't in the cache, generate
a sysquery() for the missing A. (Heck, additional data TTL's are depreciated
at the rate of 5% per use, so this would end up happening pretty quickly even
if we did cache a partial {name,type} -- but now we won't have to.)
While trying to fix all of this stuff I ended up moving some functions around
to avoid duplicating them in different source files, and I reformatted some
source lines that went over 80 characters. I also made a few things "static"
that used to be unneccessarily global. More of that will happen in 4.9.1.
DEC's product version of MIT Hesiod uses SIGXFSZ for what we do with SIGHUP;
since the default for SIGXFSZ is to exit, it seemed prudent to wire it up to
do what SIGHUP does instead, so that this BIND can run on DEC Hesiod servers.
At the request of several people, I integrated the USC "dig" and Rutgers
"host" tools into the distribution. This required some changes to the
resolver library's debugging output formats, which will be visible in
nslookup, nsquery, and any other tool that sets the RES_DEBUG option.
Note that there is no support for "DEFNAMES" in this version of dig, due
to design changes between 4.8 (from which "dig" is derived) and 4.9. there
is no reason in principle why it can't be made to work, but it doesn't work
now. therefore only fully-qualified names can be looked up with this "dig".
I had to change the name of the resolver "state" structure to be "__res_state"
for standards conformance (really, it is not reasonable to expect that because
a program includes <resolv.h> it will never define its own structure called
"state". This change highlights the imperative that any application which is
relinked against this resolver must first be recompiled against these include
files (notably <resolv.h>). This is true for almost all versions of libresolv.
I asked for items for the "TODO" list and got quite a few. Check them out
before you hack; someone else may already have started doing what you want to
do. I also asked for tools for the "contrib" subdirectory and got 650KB worth.
They make the BIND 4.9 distribution a lot larger than 4.8.3 was, but the extra
bytes are well worth their weight.
Kenneth Almquist (no relation to Phil, as far as I know) posted a patch for
res_send() that lets it keep track of servers that are responding "SERVFAIL"
or some other fatal condition; these servers are NOT used for retries of the
current query. This information is not persistent between calls to res_send()
since future calls will probably be for different {name,type} queries, which
will not neccessarily fail in the same way. This change is trivial and makes
a measurable difference in the amount of DNS traffic on my local net.
4.9-BETA ------------------- April 17, 1993 -- Paul Vixie -- DECWRL
"Peter Koch" <pk@TechFak.Uni-Bielefeld.DE>'s previous patch caused core
dumps on some systems. I fixed part of it and Peter sent me a fix for
the rest of it. All is now well.
The Bind Operations Guide in doc/BOG has been updated to 4.9. Also, the
man page in man/named.8 has had some patches applied. The copyrights are
all fixed now. Let's get this thing OUT of here!
4.9-ALPHA ------------------- March 15, 1993 -- Paul Vixie -- DECWRL
There was a really bad bug affecting wildcards. I received a patch
from "Peter Koch" <pk@TechFak.Uni-Bielefeld.DE> which fixes some of
it, but I can't quite motivate myself to fix the rest of it since I
know that what's _really_ wrong is going to require chainsaws and
dynamite to fix and that'll add another year to the release. I think
that this patch will hold us for a while.
There are a LOT of portability changes that I'm holding onto, especially
including 64-bit fixes. Do not submit any more portability changes
until 4.9.1 opens. Go ahead and make them, but be prepared to remake
them later. Let me know what you are doing but don't send me any diffs
for portability until I ask for them. 4.9 has been stuck in the barrel
for way too long already -- patches that don't fix RFC-noncompliance or
core dumps will just go into my "todo" folder (which is presently a
black hole of great mass).
4.9-ALPHA ---------------- Febrtuary 2, 1992 -- Paul Vixie -- DECWRL
Mostly portability fixes. The nslookup "lex" problem is BSDI-specific
and I'm not going to hold up release because of it. This will be the
last alpha release before the public beta. It is, as usual, running
the DEC.COM primary name service and has done so for more than a week
without any problems.
4.9-ALPHA ---------------- January 10, 1993 -- Paul Vixie -- DECWRL
Once I get the known bug in nslookup (see below) fixed, this version is going
to go into public beta. I would appreciate it if everyone would try it out.
KNOWN BUG IN THIS RELEASE: something wild is going on inside of the yylex()
routing on BSD/386 systems. It only affects nslookup. I'm still trying to
figure out how I'm going to debug this; lex experts, please see what's going
on. None of the changes since the 930105 release should have been capable
of producing this change, but something is sure doing it.
I finally fixed the {GET,PUT}{SHORT,LONG} macros to stop issuing warnings
on HP-UX systems. They are also warning-free on Ultrix(SPIM,VAX), BSDI(386),
and SunOS(SPARC) systems. I took the plunge and changed the internal functions
in res/res_comp.c to depend on these macros instead of duplicating the code,
and everything still works.
Tom Limoncelli found three ancient memory leaks. I fixed two of them
but the last one looks too much like a "cannot happen" for me to be
willing to experiment with it. Besides which, it's "very" minor.
Uses setsid() on POSIX systems. PID file is now optional. (arc@sgi)
Comments (";" or "#") are now allowed in resolv.conf (arc@sgi).
Documentation and copyright changes in README.
Known to compile on NeXT machines.
Some portability changes for AIX, whose CC is very picky.
I forgot to mention in the 921227 release that T_RP is supported (arc@sgi).
I included a number of changes that Alan Barrett has been trying to get
in since the 921221 version. Most are portability-related, and the few
things that are functional are changes to my own previous additions :-),
so I'm fairly sure that they are doing the right thing. Alan's changes
include:
include/arpa/nameser.h
improved error diagnosis in the BYTE_ORDER configuration.
changed hp9000 test to hp9000s300. As far as I know, there is
no hp9000 preprocessor symbol. Should probably add other
hp9000s<whatever> tests, but have not done so.
named/ns.h
Moved the XFER-related stuff from the end of the file to near
the top, where it is grouped with similar stuff.
Makefiles:
Add SYSLIBS variable, so folk can compile with -lBSD easily.
Changed install targets to make them easier to customise.
make links wasn't handling named.{reload,restart}*
Add ${CDEBUG} flag to link step. Some debuggers don't work
right if the program isn't linked with the -g flag.
struct timeval members are declared as unsigned long on some systems.
Add casts to (long) in several if statements that appear to assume
that tv_sec is signed.
PID_FIX in ns_main.c controlled more than just whether or not the
pid file gets fixed.
Changed it to control only that one feature.
For debugging, it is useful for a nameserver to listen to non-standard
port, but to forward requests to a standard port.
Add "-p remote/local" option to named/ns_main.c.
Also needed some other changes elsewhere.
Don't forward back to the host that asked us a question, unless they
asked from some port other than their nameserver port. This allows a
dig or nslookup user on a host to ask us questions with
recursion-desired, where we are willing to recursively ask the
nameserver on their host. However, if a nameserver asks us something
we will not recurse back to them.
nslookup() in named/ns_forw.c checks for this and returns -1.
ns_forw() and sysquery() notice this and return SERVFAIL.
Moved the nsContainsUs functionality from a separate routine
into nslookup(). No need to do the same tree walk several times.
While trying to track down various problems, added detection
and logging of errors in several syscalls in ns_main.c.
Avoid integer overflow in roundtrip time calc in ns_resp.
This needs a definition for INT_MAX.
Fixed root zone transfer bug. Also corrected some slightly misleading
comments in the doaxfr() code, and added some more comments.
4.9-ALPHA ---------------- January 5, 1993 -- Paul Vixie -- DECWRL
This one was built and tested on Ultrix 4.2 (SPIM, MIPS CC and GCC),
BSD/386 (Gamma.4), Sun SPARC (4.0.3, sorry, that's the latest I have),
4.3BSD Reno (VAX, PCC), and Ultrix 3.0 (VAX PCC).
Moved res/defs.h to conf/portability.h; named/options.h to conf/options.h.
Portability changes for O_NDELAY. SUNOS is really strange about this.
Removed some unneccessary goto's added to ns_main.c on 1jan. Oops.
Art Harkin of HP sent in a number of small (read: obviously correct)
improvements, some related to portability, some to functionality.
4.9-ALPHA ---------------- January 1, 1993 -- Paul Vixie -- DECWRL
Changed all O_NONBLOCK to O_NDELAY. Changed all {r}index to str{r}chr.
Added some SysV support in the form of bcopy->memcpy, bzero->memset.
Added C_HS support to named-xfer (greg@duke.cs.unlv.edu).
Fixed a line-number problem in asp's "include" logic (asp@uunet.uu.net).
streamq's were being used after free(). bug report from fuat@ans.net
and jpe@ee.egr.duke.edu. bug fix by vixie.
In the resolver, we now default to address 127.0.0.1 rather than 0.0.0.0.
There's a comment in the code that explains why.
In the resolver, arc@xingping.esg.sgi.com changed it to use inet_aton()
and included that function for those not running 4.4bsd.
arc@xingping.esg.sgi.com also provided lots of portability fixes and
general cleanups, in particular to nslookup which he maintains for CSRG.
4.9-ALPHA ---------------- December 27, 1992 -- Paul Vixie -- DECWRL
Added strtoul() to libresolv.a since it's yet another neccessary function
that older systems don't have. If we can stomach strcasecmp() we can sure
handle this.
Moved res/named/gethostnamadr.c to res/gethnamaddr.c (note basename change)
and res/named/sethostent.c to res/sethostent.c. Since the host table stuff
isn't in separate files any more I saw no reason to retain the subdirectory.
Updated all the copyrights and applied the small lint changes that bring
the baseline of this version from "4.8.3 as seen on ucbarpa" up to "4.8.3
as released with net-2". Thanks to the alpha testers for pointing this out
to me and for sending in the diffs.
With much howling and screaming, I ported this to UMIPS (MIPS System V).
There are a lot of really bad things going on in their libc.a, and now
they're going on in BIND as well.
I added a "res/defs.h" file and then proceeded to include it from all kinds
of files that aren't in res/. I'm thinking of moving it but I'm also trying
to figure out where -- include/ is the wrong place. res/defs.h has in it all
the ugly ifdef's needed to figure out whether this is a late-model BSD system,
a POSIX system, or just old.
All the "#endif" and "#else" cpp directives now have comments around their
annotations. It turns out that System V CPP complains about "#endif DEBUG"
but has no problem with "#endif /*DEBUG*/". In many cases where the #ifdef
was obviously visible and unambiguous, I simply removed the annotation.
The "l" is now a ";". Thanks to all who replied :-).
There was a very bad bug in the named-xfer interface. 'nuff said.
AIX needs a 32-bit field for PID's. I can't imagine. But it's fixed.
The "domain" directive in named.boot is now an option, defaulting to off.
There was a benign bug in sqrm().
doaxfr() is now shorter and clearer.
There is an "include" directive in the named.boot file now. Its syntax is
simple: "include somefile". No quotes, no "#", no <brackets>. This feature
was in 4.9-ALPHA as well, courtesy of Andrew Partan. I forgot to document it.
4.9-ALPHA ---------------- December 21, 1992 -- Paul Vixie -- DECWRL
This release incorporates fixes from a lot of people, including many from
DECWRL. Some fixes are just lint; some are to avoid dumping core on non-VAX
computers; many are to fix promiscuity, corruption, and rudeness.
Various internal DEC programmers have ported the old 4.8.3 code to various
not-entirely-BSD-like platforms and turned up some interesting lint. All
of this has been fixed. Also, we fixed a bad bug in the handling of timeouts
and SERVFAIL's when forwarders and slave are both used.
I have made major changes to the code inside the ALLOW_UPDATES ifdef's, but
I don't use it and have never compiled with that option turned on so I don't
know if it still works. Given that SNMP has come and there is an IETF WG for
SNMP management of the DNS, I am thinking very seriously of purging all of the
ALLOW_UPDATES code in 4.9.1. I suspect that Mike Schwartz will let me know if
this is ok..
(interrim "KJB" notes) ------------------- March, 1992 -- Paul Vixie -- DECWRL
If we are about to forward a query for some zone for which we are one of the
servers, we send back a SERVFAIL instead. If we don't have it, chances are
good that the other name servers won't have it either. This is the major
cause of "network meltdown" when the root servers declare you as a name server
for some zone you don't know about and havn't configured yourself for.
Fixed a memory leak such that if db_update() fails to update the database
from a response packet, a databuf will no longer be orphaned. Also fixed
what looks like a similar leak in the ALLOW_UPDATES code but I don't use it
that hasn't been tested.
Fixed a memory sponge such that if we forward a query to someone who is not
ever going to answer it, we will eventually expire it from our query queue.
Previously it would expire after N retries to N' different servers, which
could be a very long time. Particularly in the case of lame delegations and
other forwarding loops, we feel that 90 seconds (two max-retry intervals) is
enough time for a query to be answered. While we were into this code we made
several fields in the query structure into "short"'s since they were only
being used to store smallish integers. The query list gets Very Long during
a forwarding loop -- even 90 seconds worth of queries is a lot of queries.
This version includes my hacks that assign a "credibility index" to each
<name,type> such that when more credible data arrives for a given
<name,type>, all old data is purged. When equally-credible data arrives it
is aggregated in the way we all know and love; when less credible data
arrives it is completely ignored. Credibility, from best to worst, is:
1. zone files (primary or secondary)
2. authoritative answers
3. non-authoritative answers and authority records
4. additional data
5. zone files ("cache" or "bootstrap" information)
You need this version of bind if you still show any A RR's in network
32.0.0.0 when you look up uucp-gw-1.pa.dec.com's A or adobe.com's NS.
I have also added some extra code to prevent pollution of the internal
"hint cache." In all versions of BIND that I was able to test, any IN_A
response to any sysquery() would cause the IN_A RR to be added to the
fcachetab ("hint cache"). This resulted in lots of extra cruft in the hint
cache, that wasn't timed out properly, which in turn resulted in lots of
strange answers ('nuff said, take my word for it.)
Though changes have been made to make the Ultrix and GNU (2.1) C compilers
stop complaining about the source, it should still compile and run just
about anywhere. In fact, after I cleaned up lots of old lint, this version
of BIND is known to compile and run on:
Ultrix 4.2 (MIPS or VAX)
SunOS 4.0.3
BSD/386 (BSDi beta)
This was being released as King James Bind because, like KJ Sendmail, it is
a merge of every major variant of Bind that we know about. It was
assembled and tested by Paul Vixie of DEC NSL/WRL, with generous donations
of code and advice from Win Treese of DEC CRL. Changes from Don Lewis of
Harris, Andrew Partan of UUNET, and Piet Beertema of EUNet are also included.
See the OPTIONS file for a description of the changes you can control with
#ifdef's.
This server has been run on UUCP-GW-{1,2}.PA.DEC.COM, which are in the UUCP
Zone. Our named.boot file has ~1900 lines in it. Before we instituted the
changes in this release, our name server usually ran at about 16MB virtual,
15MB physical, growing slowly but constantly until we restarted it.
Whenever a new zone was added to the NIC's root zone listing us as a name
server, our servers would kill themselves and eachother (and NS.UU.NET, one
of the other UUCP Zone name servers) with forwarding loops. After these
changes, we run at a fairly constant 8MB virtual and physical size, and our
apparent CPU utilization is always 0.0% since we never finish a quantum and
the scheduler always sees us as waiting for I-O. In other words, life is good.
Notes from UCB version 4.8.3 follow:
-------------------
This is version 4.8.3 of bind. It is a test release that updates
versions 4.8 and 4.8.1 with fixes, and is essentially the same as
the version of named on the 4.3BSD Reno release. Although it is
currently described as a test release, it is believed to be reasonably
stable and more usable than the previously-released versions.
Here are some of the more important changes:
o A list of domains may be specified for searching in resolv.conf instead
of just the local domain name.
o gethostbyname() will accept a dotted quad.
o Support has been added for the the T_TXT data type and for the class
C_HS. These are both used by Hesiod from Project Athena at MIT.
o All of the pathnames have been put into one header file. This
makes it easier to change the location based upon your local
configuration.
o Responses are only accepted from an address to which we might of sent
the request. This might cause problems if some server is multihomed
and is still running BIND 4.3, but it prevents attacks induced by
sending responses from another address.
o Numerous bugs have been fixed: Adding a new authoritative zone now
works when the server has a cached SOA record. Comparisons in the
db now look at type and class as well instead of dropping records
with identical data. Scheduling of maintenance interrupts has been
moved to one routine avoid spurious ones. Named goes into the background
after more of the initialization is done. Stream connection queue
handling was cleaned up including a bug that caused data corruption
and core dumps. Sys5 no longer can have multiple transfers of the
same zone occuring at the same time. Handle CNAME -> CNAME loops
more gracefully. Avoid making one server never get queried. Border
conditions in resolver are checked more accurately.
o Nslookup has been updated.
There are several bug reports that have yet to be integrated into this
version. Hopefully they will be dealt with in the next release. Please
send feedback on this release.
Notes from versions 4.8.1 and 4.8 follow:
------------------
This is version 4.8.1 of bind. It is a test release that includes
version 4.8 with fixes, asynchronous zone transfer and better reload
capabilities. Although it is currently described as a test release,
it is believed to be reasonably stable and more usable than the currently-
released version, 4.8. The changes of note are:
o The asynchronous zone transfer code previously posted to the bind
mailing list has been integrated, completed and tested. There are
a number of changes from the version posted, including fixes to
allow top-level domains to work and a simplification of the timer
code.
o The code for reloading the server has been changed so that only
primary zones master files that have changed are reloaded. The
cache and secondary zones are not flushed, and the sortlist, domain,
etc. are reset to correspond to the boot file contents.
o Several bugs have been fixed: the name "*" is not interpreted as
a wildcard in cached zones, only in primary zones. Secondary servers
no longer decrement the time-to-live of records by the time since
they verified the zone with the master; as a result, they never
hand out nameserver referrals with too short a TTL to be usable.
A bug was fixed that caused secondary servers with out-of-date
zones to return empty answers between the actual expiration time
and the next timeout.
There are several other bugs that have been reported but have not yet
been fixed. In addition, the next regular release of named will
support negative caching, but this has not been integrated.
I would appreciate receiving feedback on this release; in particular,
problems (or lack of problems) when installing on various systems.
I attempted to update the SysV code when integrating the zone-transfer,
but haven't tested it.
The notes from version 4.8 follow.
----------
Welcome to version 4.8 of bind.
There have been several changes to the named boot file (/etc/named.boot)
of which you should be aware. The "domain" line for each zone is no longer
needed, but one such line may still be used to specify a default domain
to be used for queries containing names with only a single component.
The term "suffixes", which was added in version 4.7alpha, has been removed.
The manual page on named (named.8) has been updated to reflect all
these changes. Please read this and look at the example files
before installation. You should also note the changes in the
resolver code to support non-fully-qualified addresses and per-user
host aliases. See hostname(7) for an overview. Two new routines
have been added to the resolver library since the last test release:
res_query formulates a query, sends it, waits for a response and does
preliminary error checking; res_search implements the search rules
of gethostbyname using res_query.
The MX lookup routine in sendmail has been modified to use res_search.
Also, dn_skip takes an additional parameter and has been renamed
to dn_skipname. While old sendmail binaries will work with the new
version of bind, because of these changes, it is desirable to install
new sendmail sources and recompile sendmail. Do not rebuild sendmail
from old sources. The new sendmail is on ucbarpa.Berkeley.EDU for
anonymous FTP from pub/4.3/sendmail.MX.tar and pub/4.3/sendmail.MX.tar.Z.
There have been numerous changes to named, fixing most of the known
bugs that can be fixed without major structural changes in the server.
Several server configurations that failed before should now work.
Certain robustness problems have been fixed, in particular bounds-
checking when processing incoming packets. Two changes have been made
in preparation for negative caching: SOA records are sent in the authority
section in negative responses with NXDOMAIN set, and a bug was fixed that
caused confusion and repeated requests if a response had no error, no answer
and an SOA in the authority section. As such responses are already sent
by other servers, and will be sent by the next release of BIND, it is
important that all sites upgrade to this version as quickly as possible.
The root "hint" cache and cache file remain the largest problem area,
along with named's naivete in accepting bogus server's data.
These will be addressed in the next release, along with asynchronous
zone transfers, intelligent reloading of zone files, faster startup,
and caching of negative responses.
This version (4.8) will replace the last officially released version (4.5).
Version 4.5 has a serious bug that causes the generation of a continuous
stream of bogons to the root domain servers (bogus queries with the query
response bit set and possibly garbage for nsid and rcode). It is imperative
that these versions of named be replaced as fast as possible. We urge you to
field 4.8 quickly, for the sake of the root domain servers.
Mike Karels
Jean Wood
bind@ucbarpa.Berkeley.EDU
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