Dereference support

This adds support for the newly proposed LDAP Dereference feature (not to
be confused with alias dereferencing).  The details of the proposed feature
can be found here:
http://www.openldap.org/devel/cvsweb.cgi/~checkout~/doc/drafts/draft-masarati-ldap-deref-xx.txt
This adds a new deref plugin to the directory server.  This is a pre op search
plugin.  In order to allow the plugin to rewrite the controls sent back with
each entry, I changed the way pre-search and pre-entry plugins work.  They now
have the ability to alter the entry and controls just before being sent back
to the client.
This plugin does not currently support internal operations.  It should be easy
to add a call to register the plugin for internal ops if we need to do that.
The code supports real, computed (e.g. memberOf), and virtual attributes
both as the attibute to dereference and in the list of attributes to return
from each dereferenced entry.  This will allow us to use attributes such as
nsRole as the derefattr.
Tested on RHEL5 x86_64 with various openldap 2.4.15+ and Net::LDAP clients.
valgrind output is clean

1 files changed, 27 insertions, 34 deletions

diff --git a/missing b/missing
index 1c8ff704..894e786e 100755
--- a/missing
+++ b/missing
@@ -1,9 +1,9 @@
 #! /bin/sh
 # Common stub for a few missing GNU programs while installing.
 
-scriptversion=2006-05-10.23
+scriptversion=2005-06-08.21
 
-# Copyright (C) 1996, 1997, 1999, 2000, 2002, 2003, 2004, 2005, 2006
+# Copyright (C) 1996, 1997, 1999, 2000, 2002, 2003, 2004, 2005
 #   Free Software Foundation, Inc.
 # Originally by Fran,cois Pinard <pinard@iro.umontreal.ca>, 1996.
 
@@ -33,8 +33,6 @@ if test $# -eq 0; then
 fi
 
 run=:
-sed_output='s/.* --output[ =]\([^ ]*\).*/\1/p'
-sed_minuso='s/.* -o \([^ ]*\).*/\1/p'
 
 # In the cases where this matters, `missing' is being run in the
 # srcdir already.
@@ -46,7 +44,7 @@ fi
 
 msg="missing on your system"
 
-case $1 in
+case "$1" in
 --run)
   # Try to run requested program, and just exit if it succeeds.
   run=
@@ -79,7 +77,6 @@ Supported PROGRAM values:
   aclocal      touch file \`aclocal.m4'
   autoconf     touch file \`configure'
   autoheader   touch file \`config.h.in'
-  autom4te     touch the output file, or create a stub one
   automake     touch all \`Makefile.in' files
   bison        create \`y.tab.[ch]', if possible, from existing .[ch]
   flex         create \`lex.yy.c', if possible, from existing .c
@@ -109,7 +106,7 @@ esac
 # Now exit if we have it, but it failed.  Also exit now if we
 # don't have it and --version was passed (most likely to detect
 # the program).
-case $1 in
+case "$1" in
   lex|yacc)
     # Not GNU programs, they don't have --version.
     ;;
@@ -138,7 +135,7 @@ esac
 
 # If it does not exist, or fails to run (possibly an outdated version),
 # try to emulate it.
-case $1 in
+case "$1" in
   aclocal*)
     echo 1>&2 "\
 WARNING: \`$1' is $msg.  You should only need it if
@@ -167,7 +164,7 @@ WARNING: \`$1' is $msg.  You should only need it if
     test -z "$files" && files="config.h"
     touch_files=
     for f in $files; do
-      case $f in
+      case "$f" in
       *:*) touch_files="$touch_files "`echo "$f" |
 				       sed -e 's/^[^:]*://' -e 's/:.*//'`;;
       *) touch_files="$touch_files $f.in";;
@@ -195,8 +192,8 @@ WARNING: \`$1' is needed, but is $msg.
          You can get \`$1' as part of \`Autoconf' from any GNU
          archive site."
 
-    file=`echo "$*" | sed -n "$sed_output"`
-    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
+    file=`echo "$*" | sed -n 's/.*--output[ =]*\([^ ]*\).*/\1/p'`
+    test -z "$file" && file=`echo "$*" | sed -n 's/.*-o[ ]*\([^ ]*\).*/\1/p'`
     if test -f "$file"; then
 	touch $file
     else
@@ -217,25 +214,25 @@ WARNING: \`$1' $msg.  You should only need it if
          in order for those modifications to take effect.  You can get
          \`Bison' from any GNU archive site."
     rm -f y.tab.c y.tab.h
-    if test $# -ne 1; then
+    if [ $# -ne 1 ]; then
         eval LASTARG="\${$#}"
-	case $LASTARG in
+	case "$LASTARG" in
 	*.y)
 	    SRCFILE=`echo "$LASTARG" | sed 's/y$/c/'`
-	    if test -f "$SRCFILE"; then
+	    if [ -f "$SRCFILE" ]; then
 	         cp "$SRCFILE" y.tab.c
 	    fi
 	    SRCFILE=`echo "$LASTARG" | sed 's/y$/h/'`
-	    if test -f "$SRCFILE"; then
+	    if [ -f "$SRCFILE" ]; then
 	         cp "$SRCFILE" y.tab.h
 	    fi
 	  ;;
 	esac
     fi
-    if test ! -f y.tab.h; then
+    if [ ! -f y.tab.h ]; then
 	echo >y.tab.h
     fi
-    if test ! -f y.tab.c; then
+    if [ ! -f y.tab.c ]; then
 	echo 'main() { return 0; }' >y.tab.c
     fi
     ;;
@@ -247,18 +244,18 @@ WARNING: \`$1' is $msg.  You should only need it if
          in order for those modifications to take effect.  You can get
          \`Flex' from any GNU archive site."
     rm -f lex.yy.c
-    if test $# -ne 1; then
+    if [ $# -ne 1 ]; then
         eval LASTARG="\${$#}"
-	case $LASTARG in
+	case "$LASTARG" in
 	*.l)
 	    SRCFILE=`echo "$LASTARG" | sed 's/l$/c/'`
-	    if test -f "$SRCFILE"; then
+	    if [ -f "$SRCFILE" ]; then
 	         cp "$SRCFILE" lex.yy.c
 	    fi
 	  ;;
 	esac
     fi
-    if test ! -f lex.yy.c; then
+    if [ ! -f lex.yy.c ]; then
 	echo 'main() { return 0; }' >lex.yy.c
     fi
     ;;
@@ -270,9 +267,11 @@ WARNING: \`$1' is $msg.  You should only need it if
 	 \`Help2man' package in order for those modifications to take
 	 effect.  You can get \`Help2man' from any GNU archive site."
 
-    file=`echo "$*" | sed -n "$sed_output"`
-    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
-    if test -f "$file"; then
+    file=`echo "$*" | sed -n 's/.*-o \([^ ]*\).*/\1/p'`
+    if test -z "$file"; then
+	file=`echo "$*" | sed -n 's/.*--output=\([^ ]*\).*/\1/p'`
+    fi
+    if [ -f "$file" ]; then
 	touch $file
     else
 	test -z "$file" || exec >$file
@@ -290,17 +289,11 @@ WARNING: \`$1' is $msg.  You should only need it if
          DU, IRIX).  You might want to install the \`Texinfo' package or
          the \`GNU make' package.  Grab either from any GNU archive site."
     # The file to touch is that specified with -o ...
-    file=`echo "$*" | sed -n "$sed_output"`
-    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
+    file=`echo "$*" | sed -n 's/.*-o \([^ ]*\).*/\1/p'`
     if test -z "$file"; then
       # ... or it is the one specified with @setfilename ...
       infile=`echo "$*" | sed 's/.* \([^ ]*\) *$/\1/'`
-      file=`sed -n '
-	/^@setfilename/{
-	  s/.* \([^ ]*\) *$/\1/
-	  p
-	  q
-	}' $infile`
+      file=`sed -n '/^@setfilename/ { s/.* \([^ ]*\) *$/\1/; p; q; }' $infile`
       # ... or it is derived from the source name (dir/f.texi becomes f.info)
       test -z "$file" && file=`echo "$infile" | sed 's,.*/,,;s,.[^.]*$,,'`.info
     fi
@@ -324,13 +317,13 @@ WARNING: \`$1' is $msg.  You should only need it if
     fi
     firstarg="$1"
     if shift; then
-	case $firstarg in
+	case "$firstarg" in
 	*o*)
 	    firstarg=`echo "$firstarg" | sed s/o//`
 	    tar "$firstarg" "$@" && exit 0
 	    ;;
 	esac
-	case $firstarg in
+	case "$firstarg" in
 	*h*)
 	    firstarg=`echo "$firstarg" | sed s/h//`
 	    tar "$firstarg" "$@" && exit 0