Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r228600:

Fix the incompatible enum conversions in libexec/ypxfr in another, more
messy way, so as to not disrupt other yp programs: just add casts to
convert the incompatible enums, as the numerical values are the same
(either by accident, design, or the phase of the moon at that time).

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Remove definition of struct dom_binding, it's non-standard C code and
unnecessary since src/include/rpcsvc/ypclnt.h's revision 1.10.

Tidy up some xdrproc_t related warnings.

Use __FBSDID vs. rcsid[].

Fix warnings.

Sponsored by: DARPA, NAI Labs

ANSIfy and remove some dead code.

Sponsored by: DARPA, NAI Labs

Apply the following mechanical transformations in preparation for
ansification and constification:

s{\s+__P\((\(.*?\))\)}{$1}g;
s{\(\s+}{\(}g;
s{\s+\)}{\)}g;
s{\s+,}{,}g;
s{(\s+)(for|if|switch|while)\(}{$1$2 \(}g;
s{return ([^\(].*?);}{return ($1);}g;
s{([\w\)])([!=+/\*-]?=)([\w\(+-])}{$1 $2 $3}g;
s{\s+$}{\n};g

Also add $FreeBSD$ where needed.

MFC after: 1 week

$Id$ -> $FreeBSD$

Fix ypxfr so that it can be run from cron.

Patch submitted by: Dan Nelson <dnelson@emsphone.com>

Fixed printf format errors.

Use full path in synopsis. Sort #includes. Use .Tn for NIS.

Putting records with zero-length keys into a Berkeley DB hash database
is asking for trouble (sequential database enumerations can get caught
in an infinite loop). The yp_mkdb(8) utility avoids putting such records
into a database, but ypxfr does not. Today I got bit by a NULL entry in
one of the amd maps on my network, which is served by a SunOS master.
The map was transfered successfully to my FreeBSD slave, but attempting
to dump it with ypcat(1) caused ypserv(8) to transmit the same record
over and over again, making the map appear to be infinitely large. I
finally noticed the problem while testing a new version of amd under
development at the Columbia CS department, which began gobbling up insane
amounts of memory while trying to swallow the map.

To deal with this problem, I'm modifying ypxfr to watch for records
with zero-length keys and turn them into something less destructive
before writing them to the database.

compare return value from getopt against -1 rather than EOF, per the final
posix standard on the topic.

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Give ypxfr the ability to detect the presence of the YP_INTERDOMAIN
and YP_SECURE flags so that it can properly add them to newly created
maps when needed. This applies only when using the 'standard' method
for map transfers. When using rpc.ypxfrd, the whole map is copied
verbatim, along with any special entries that may be encoded in it.

Also made -Wall a little quieter for ypxfrd_getmap.c.

Add a couple of reserved port checks: don't talk to either ypserv
or rpc.ypxfrd processes on remote systems that aren't bound to reserved
ports. The servers already do reserved port checks on the clients.

Obtained from: scrutinizing the OpenBSD ypxfr sources. (Note that this
applies to the ypserv check only; OpenBSD doesn't have an rpc.ypxfrd.)

Add support for rpc.ypxfrd and document it in the man page.

Also generallize the yp_dbwrite functions a little: allow the caller
to specify certain flags. I need this mostly for some changes to
rpc.yppasswdd to allow in-place updates.

Also change Makefile a little to use the same format as ypserv.

- Fix error reporting when checking order number via NIS: we return zero
on a failure, but if we're checking a corrupt map we could also get back
a zero from ypserv without really encountering any actual error. Flag this
condition and generate an meaningful error message.

- Fix transmission of ypxfr_clear to ypserv: error checking was wrong
and we sending YPXFR_YPERR as an error status instead of YPXFR_CLEAR.

- To help avoid a race condition (or at least reduce the likelyhood of
it occuring), use rename() to move a newly transfered map into place
instead of unlink()ing the old one first and then renaming. Da man page
sez that rename should do the unlink() for us. This prevents ypserv
from returning 'no such map in domain' when asked to query a map which
ypxfr has just unlink()ed but not yet replaced.

Sync with my sources at home (these are really tiny changes):

- Fix a SEGV condition in ypxfr_main.c that reared its ugly head while I
was working on the 'parallel jobs' feature of the new yppush. After we've
completed the map transfer and created a local temporary copy, we check
the order number of the map on ypserv again to make sure it didn't change
while the transfer was in progress (map skew). If for some reason we flat
out fail to get the order number from the server, we flag this as an
error and bail, telling ypxfr_exit() to clean up our temporary files
for us. However, ypxfr_exit() tries to close the database before unkining
it, not realizing that it has already been closed prior to the skew check.
The second attempt to close the database causes a SEGV somewhere inside
the DB code.

(Well, it does on my 2.0.5 machine anyway. I haven't seen anyone modify
the DB library code in ages, so the condition is probably still there.)

To work around this, we deliberately set dbp to NULL after closing the
database and check for the condition in ypxfr_exit(), being careful to
avoid the second close if we see the NULL.

- In yp_dbwrite.c, make yp_open_db_rw() open the database with O_EXLOCK
flag set. This probably won't affect much of anything, but I feel better
having it there.

This commit was generated by cvs2svn to compensate for changes in r13007,
which included commits to RCS files with non-trunk default branches.

Import the new ypxfr, written by yours truly. Functionally equivalent
to the old one, except that it supports an additional option (-p path)
that lets you specify the top level path wiere your NIS maps live.
(ypserv allows you to specify a path like this, so it makes sense that
ypxfr should too. ypserv will automagically pass the -p flag to ypxfr
if you use a path other than /var/yp when you start it.)

This program uses client stub code generated by rpcgen as well as
the yp_dblookup.c module from ypserv.