Adding upstream version 2.6.7+dfsg.upstream/2.6.7+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1025 insertions, 0 deletions

diff --git a/servers/slapd/entry.c b/servers/slapd/entry.c
new file mode 100644
index 0000000..8e1463c
--- /dev/null
+++ b/servers/slapd/entry.c
@@ -0,0 +1,1025 @@
+/* entry.c - routines for dealing with entries */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* Portions Copyright (c) 1995 Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and that due credit is given
+ * to the University of Michigan at Ann Arbor. The name of the University
+ * may not be used to endorse or promote products derived from this
+ * software without specific prior written permission. This software
+ * is provided ``as is'' without express or implied warranty.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/ctype.h>
+#include <ac/errno.h>
+#include <ac/socket.h>
+#include <ac/string.h>
+
+#include "slap.h"
+#include "ldif.h"
+
+static char		*ebuf;	/* buf returned by entry2str		 */
+static char		*ecur;	/* pointer to end of currently used ebuf */
+static int		emaxsize;/* max size of ebuf			 */
+
+/*
+ * Empty root entry
+ */
+const Entry slap_entry_root = {
+	NOID, { 0, "" }, { 0, "" }, NULL, 0, { 0, "" }, NULL
+};
+
+/*
+ * these mutexes must be used when calling the entry2str()
+ * routine since it returns a pointer to static data.
+ */
+ldap_pvt_thread_mutex_t	entry2str_mutex;
+
+static const struct berval dn_bv = BER_BVC("dn");
+
+/*
+ * Entry free list
+ *
+ * Allocate in chunks, minimum of 1000 at a time.
+ */
+#define	CHUNK_SIZE	1000
+typedef struct slap_list {
+	struct slap_list *next;
+} slap_list;
+static slap_list *entry_chunks;
+static Entry *entry_list;
+static ldap_pvt_thread_mutex_t entry_mutex;
+
+int entry_destroy(void)
+{
+	slap_list *e;
+	if ( ebuf ) free( ebuf );
+	ebuf = NULL;
+	ecur = NULL;
+	emaxsize = 0;
+
+	for ( e=entry_chunks; e; e=entry_chunks ) {
+		entry_chunks = e->next;
+		free( e );
+	}
+
+	ldap_pvt_thread_mutex_destroy( &entry_mutex );
+	ldap_pvt_thread_mutex_destroy( &entry2str_mutex );
+	return attr_destroy();
+}
+
+int
+entry_init(void)
+{
+	ldap_pvt_thread_mutex_init( &entry2str_mutex );
+	ldap_pvt_thread_mutex_init( &entry_mutex );
+	return attr_init();
+}
+
+Entry *
+str2entry( char *s )
+{
+	return str2entry2( s, 1 );
+}
+
+#define bvcasematch(bv1, bv2)	(ber_bvstrcasecmp(bv1, bv2) == 0)
+
+Entry *
+str2entry2( char *s, int checkvals )
+{
+	int rc;
+	Entry		*e;
+	struct berval	*type, *vals, *nvals;
+	char 	*freeval;
+	AttributeDescription *ad, *ad_prev;
+	const char *text;
+	char	*next;
+	int		attr_cnt;
+	int		i, lines;
+	Attribute	ahead, *atail;
+
+	/*
+	 * LDIF is used as the string format.
+	 * An entry looks like this:
+	 *
+	 *	dn: <dn>\n
+	 *	[<attr>:[:] <value>\n]
+	 *	[<tab><continuedvalue>\n]*
+	 *	...
+	 *
+	 * If a double colon is used after a type, it means the
+	 * following value is encoded as a base 64 string.  This
+	 * happens if the value contains a non-printing character
+	 * or newline.
+	 */
+
+	Debug( LDAP_DEBUG_TRACE, "=> str2entry: \"%s\"\n",
+		s ? s : "NULL" );
+
+	e = entry_alloc();
+
+	if( e == NULL ) {
+		Debug( LDAP_DEBUG_ANY,
+			"<= str2entry NULL (entry allocation failed)\n" );
+		return( NULL );
+	}
+
+	/* initialize entry */
+	e->e_id = NOID;
+
+	/* dn + attributes */
+	atail = &ahead;
+	ahead.a_next = NULL;
+	ad = NULL;
+	ad_prev = NULL;
+	attr_cnt = 0;
+	next = s;
+
+	lines = ldif_countlines( s );
+	type = ch_calloc( 1, (lines+1)*3*sizeof(struct berval)+lines );
+	vals = type+lines+1;
+	nvals = vals+lines+1;
+	freeval = (char *)(nvals+lines+1);
+	i = -1;
+
+	/* parse into individual values, record DN */
+	while ( (s = ldif_getline( &next )) != NULL ) {
+		int freev;
+		if ( *s == '\n' || *s == '\0' ) {
+			break;
+		}
+		i++;
+		if (i >= lines) {
+			Debug( LDAP_DEBUG_TRACE,
+				"<= str2entry ran past end of entry\n" );
+			goto fail;
+		}
+
+		rc = ldif_parse_line2( s, type+i, vals+i, &freev );
+		freeval[i] = freev;
+		if ( rc ) {
+			Debug( LDAP_DEBUG_TRACE,
+				"<= str2entry NULL (parse_line)\n" );
+			continue;
+		}
+
+		if ( bvcasematch( &type[i], &dn_bv ) ) {
+			if ( e->e_dn != NULL ) {
+				Debug( LDAP_DEBUG_ANY, "str2entry: "
+					"entry %ld has multiple DNs \"%s\" and \"%s\"\n",
+					(long) e->e_id, e->e_dn, vals[i].bv_val );
+				goto fail;
+			}
+
+			rc = dnPrettyNormal( NULL, &vals[i], &e->e_name, &e->e_nname, NULL );
+			if( rc != LDAP_SUCCESS ) {
+				Debug( LDAP_DEBUG_ANY, "str2entry: "
+					"entry %ld has invalid DN \"%s\"\n",
+					(long) e->e_id, vals[i].bv_val );
+				goto fail;
+			}
+			if ( freeval[i] ) free( vals[i].bv_val );
+			vals[i].bv_val = NULL;
+			i--;
+			continue;
+		}
+	}
+	lines = i+1;
+
+	/* check to make sure there was a dn: line */
+	if ( BER_BVISNULL( &e->e_name )) {
+		Debug( LDAP_DEBUG_ANY, "str2entry: entry %ld has no dn\n",
+			(long) e->e_id );
+		goto fail;
+	}
+
+	/* Make sure all attributes with multiple values are contiguous */
+	if ( checkvals ) {
+		int j, k;
+		struct berval bv;
+		int fv;
+
+		for (i=0; i<lines; i++) {
+			for ( j=i+1; j<lines; j++ ) {
+				if ( bvcasematch( type+i, type+j )) {
+					/* out of order, move intervening attributes down */
+					if ( j != i+1 ) {
+						bv = vals[j];
+						fv = freeval[j];
+						for ( k=j; k>i; k-- ) {
+							type[k] = type[k-1];
+							vals[k] = vals[k-1];
+							freeval[k] = freeval[k-1];
+						}
+						k++;
+						type[k] = type[i];
+						vals[k] = bv;
+						freeval[k] = fv;
+					}
+					i++;
+				}
+			}
+		}
+	}
+
+	if ( lines > 0 ) {
+		for ( i=0; i<=lines; i++ ) {
+			ad_prev = ad;
+			if ( !ad || ( i<lines && !bvcasematch( type+i, &ad->ad_cname ))) {
+				ad = NULL;
+				rc = slap_bv2ad( type+i, &ad, &text );
+	
+				if( rc != LDAP_SUCCESS ) {
+					int wtool = ( slapMode & (SLAP_TOOL_MODE|SLAP_TOOL_READONLY|SLAP_TOOL_NO_SCHEMA_CHECK) ) == SLAP_TOOL_MODE;
+					Debug( wtool ? LDAP_DEBUG_ANY : LDAP_DEBUG_TRACE,
+						"<= str2entry: str2ad(%s): %s\n", type[i].bv_val, text );
+					if( wtool ) {
+						goto fail;
+					}
+	
+					rc = slap_bv2undef_ad( type+i, &ad, &text, 0 );
+					if( rc != LDAP_SUCCESS ) {
+						Debug( LDAP_DEBUG_ANY,
+							"<= str2entry: slap_str2undef_ad(%s): %s\n",
+								type[i].bv_val, text );
+						goto fail;
+					}
+				}
+	
+				/* require ';binary' when appropriate (ITS#5071) */
+				if ( slap_syntax_is_binary( ad->ad_type->sat_syntax ) && !slap_ad_is_binary( ad ) ) {
+					Debug( LDAP_DEBUG_ANY,
+						"str2entry: attributeType %s #%d: "
+						"needs ';binary' transfer as per syntax %s\n", 
+						ad->ad_cname.bv_val, 0,
+						ad->ad_type->sat_syntax->ssyn_oid );
+					goto fail;
+				}
+			}
+	
+			if (( ad_prev && ad != ad_prev ) || ( i == lines )) {
+				int j, k;
+				atail->a_next = attr_alloc( NULL );
+				atail = atail->a_next;
+				atail->a_flags = 0;
+				atail->a_numvals = attr_cnt;
+				atail->a_desc = ad_prev;
+				atail->a_vals = ch_malloc( (attr_cnt + 1) * sizeof(struct berval));
+				if( ad_prev->ad_type->sat_equality &&
+					ad_prev->ad_type->sat_equality->smr_normalize )
+					atail->a_nvals = ch_malloc( (attr_cnt + 1) * sizeof(struct berval));
+				else
+					atail->a_nvals = NULL;
+				k = i - attr_cnt;
+				for ( j=0; j<attr_cnt; j++ ) {
+					if ( freeval[k] )
+						atail->a_vals[j] = vals[k];
+					else
+						ber_dupbv( atail->a_vals+j, &vals[k] );
+					vals[k].bv_val = NULL;
+					if ( atail->a_nvals ) {
+						atail->a_nvals[j] = nvals[k];
+						nvals[k].bv_val = NULL;
+					}
+					k++;
+				}
+				BER_BVZERO( &atail->a_vals[j] );
+				if ( atail->a_nvals ) {
+					BER_BVZERO( &atail->a_nvals[j] );
+				} else {
+					atail->a_nvals = atail->a_vals;
+				}
+				attr_cnt = 0;
+				/* FIXME: we only need this when migrating from an unsorted DB */
+				if ( atail->a_desc->ad_type->sat_flags & SLAP_AT_SORTED_VAL ) {
+					rc = slap_sort_vals( (Modifications *)atail, &text, &j, NULL );
+					if ( rc == LDAP_SUCCESS ) {
+						atail->a_flags |= SLAP_ATTR_SORTED_VALS;
+					} else if ( rc == LDAP_TYPE_OR_VALUE_EXISTS ) {
+						Debug( LDAP_DEBUG_ANY,
+							"str2entry: attributeType %s value #%d provided more than once\n",
+							atail->a_desc->ad_cname.bv_val, j );
+						goto fail;
+					}
+				}
+				if ( i == lines ) break;
+			}
+	
+			if ( BER_BVISNULL( &vals[i] ) ) {
+				Debug( LDAP_DEBUG_ANY,
+					"str2entry: attributeType %s #%d: "
+					"no value\n", 
+					ad->ad_cname.bv_val, attr_cnt );
+				goto fail;
+			}
+	
+			if ( ad->ad_type->sat_equality &&
+				ad->ad_type->sat_equality->smr_normalize )
+			{
+				rc = ordered_value_normalize(
+					SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
+					ad,
+					ad->ad_type->sat_equality,
+					&vals[i], &nvals[i], NULL );
+	
+				if ( rc ) {
+					Debug( LDAP_DEBUG_ANY,
+						"<= str2entry NULL (smr_normalize %s %d)\n", ad->ad_cname.bv_val, rc );
+					goto fail;
+				}
+			}
+	
+			attr_cnt++;
+		}
+	}
+
+	free( type );
+	atail->a_next = NULL;
+	e->e_attrs = ahead.a_next;
+
+	Debug(LDAP_DEBUG_TRACE, "<= str2entry(%s) -> 0x%lx\n",
+		e->e_dn, (unsigned long) e );
+	return( e );
+
+fail:
+	for ( i=0; i<lines; i++ ) {
+		if ( freeval[i] ) free( vals[i].bv_val );
+		free( nvals[i].bv_val );
+	}
+	free( type );
+	entry_free( e );
+	return NULL;
+}
+
+
+#define GRABSIZE	BUFSIZ
+
+#define MAKE_SPACE( n )	{ \
+		while ( ecur + (n) > ebuf + emaxsize ) { \
+			ptrdiff_t	offset; \
+			offset = (int) (ecur - ebuf); \
+			ebuf = ch_realloc( ebuf, \
+				emaxsize + GRABSIZE ); \
+			emaxsize += GRABSIZE; \
+			ecur = ebuf + offset; \
+		} \
+	}
+
+/* NOTE: only preserved for binary compatibility */
+char *
+entry2str(
+	Entry	*e,
+	int		*len )
+{
+	return entry2str_wrap( e, len, LDIF_LINE_WIDTH );
+}
+
+char *
+entry2str_wrap(
+	Entry		*e,
+	int			*len,
+	ber_len_t	wrap )
+{
+	Attribute	*a;
+	struct berval	*bv;
+	int		i;
+	ber_len_t tmplen;
+
+	assert( e != NULL );
+
+	/*
+	 * In string format, an entry looks like this:
+	 *	dn: <dn>\n
+	 *	[<attr>: <value>\n]*
+	 */
+
+	ecur = ebuf;
+
+	/* put the dn */
+	if ( e->e_dn != NULL ) {
+		/* put "dn: <dn>" */
+		tmplen = e->e_name.bv_len;
+		MAKE_SPACE( LDIF_SIZE_NEEDED( 2, tmplen ));
+		ldif_sput_wrap( &ecur, LDIF_PUT_VALUE, "dn", e->e_dn, tmplen, wrap );
+	}
+
+	/* put the attributes */
+	for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
+		/* put "<type>:[:] <value>" line for each value */
+		for ( i = 0; a->a_vals[i].bv_val != NULL; i++ ) {
+			bv = &a->a_vals[i];
+			tmplen = a->a_desc->ad_cname.bv_len;
+			MAKE_SPACE( LDIF_SIZE_NEEDED( tmplen, bv->bv_len ));
+			ldif_sput_wrap( &ecur, LDIF_PUT_VALUE,
+				a->a_desc->ad_cname.bv_val,
+				bv->bv_val, bv->bv_len, wrap );
+		}
+	}
+	MAKE_SPACE( 1 );
+	*ecur = '\0';
+	*len = ecur - ebuf;
+
+	return( ebuf );
+}
+
+void
+entry_clean( Entry *e )
+{
+	/* free an entry structure */
+	assert( e != NULL );
+
+	/* e_private must be freed by the caller */
+	assert( e->e_private == NULL );
+
+	e->e_id = 0;
+
+	/* free DNs */
+	if ( !BER_BVISNULL( &e->e_name ) ) {
+		free( e->e_name.bv_val );
+		BER_BVZERO( &e->e_name );
+	}
+	if ( !BER_BVISNULL( &e->e_nname ) ) {
+		free( e->e_nname.bv_val );
+		BER_BVZERO( &e->e_nname );
+	}
+
+	if ( !BER_BVISNULL( &e->e_bv ) ) {
+		free( e->e_bv.bv_val );
+		BER_BVZERO( &e->e_bv );
+	}
+
+	/* free attributes */
+	if ( e->e_attrs ) {
+		attrs_free( e->e_attrs );
+		e->e_attrs = NULL;
+	}
+
+	e->e_ocflags = 0;
+}
+
+void
+entry_free( Entry *e )
+{
+	entry_clean( e );
+
+	ldap_pvt_thread_mutex_lock( &entry_mutex );
+	e->e_private = entry_list;
+	entry_list = e;
+	ldap_pvt_thread_mutex_unlock( &entry_mutex );
+}
+
+/* These parameters work well on AMD64 */
+#if 0
+#define	STRIDE 8
+#define	STRIPE 5
+#else
+#define	STRIDE 1
+#define	STRIPE 1
+#endif
+#define	STRIDE_FACTOR (STRIDE*STRIPE)
+
+int
+entry_prealloc( int num )
+{
+	Entry *e, **prev, *tmp;
+	slap_list *s;
+	int i, j;
+
+	if (!num) return 0;
+
+#if STRIDE_FACTOR > 1
+	/* Round up to our stride factor */
+	num += STRIDE_FACTOR-1;
+	num /= STRIDE_FACTOR;
+	num *= STRIDE_FACTOR;
+#endif
+
+	s = ch_calloc( 1, sizeof(slap_list) + num * sizeof(Entry));
+	s->next = entry_chunks;
+	entry_chunks = s;
+
+	prev = &tmp;
+	for (i=0; i<STRIPE; i++) {
+		e = (Entry *)(s+1);
+		e += i;
+		for (j=i; j<num; j+= STRIDE) {
+			*prev = e;
+			prev = (Entry **)&e->e_private;
+			e += STRIDE;
+		}
+	}
+	*prev = entry_list;
+	entry_list = (Entry *)(s+1);
+
+	return 0;
+}
+
+Entry *
+entry_alloc( void )
+{
+	Entry *e;
+
+	ldap_pvt_thread_mutex_lock( &entry_mutex );
+	if ( !entry_list )
+		entry_prealloc( CHUNK_SIZE );
+	e = entry_list;
+	entry_list = e->e_private;
+	e->e_private = NULL;
+	ldap_pvt_thread_mutex_unlock( &entry_mutex );
+
+	return e;
+}
+
+
+/*
+ * These routines are used only by Backend.
+ *
+ * the Entry has three entry points (ways to find things):
+ *
+ *	by entry	e.g., if you already have an entry from the cache
+ *			and want to delete it. (really by entry ptr)
+ *	by dn		e.g., when looking for the base object of a search
+ *	by id		e.g., for search candidates
+ *
+ * these correspond to three different avl trees that are maintained.
+ */
+
+int
+entry_cmp( Entry *e1, Entry *e2 )
+{
+	return SLAP_PTRCMP( e1, e2 );
+}
+
+int
+entry_dn_cmp( const void *v_e1, const void *v_e2 )
+{
+	/* compare their normalized UPPERCASED dn's */
+	const Entry *e1 = v_e1, *e2 = v_e2;
+
+	return ber_bvcmp( &e1->e_nname, &e2->e_nname );
+}
+
+int
+entry_id_cmp( const void *v_e1, const void *v_e2 )
+{
+	const Entry *e1 = v_e1, *e2 = v_e2;
+	return( e1->e_id < e2->e_id ? -1 : (e1->e_id > e2->e_id ? 1 : 0) );
+}
+
+/* This is like a ber_len */
+#define entry_lenlen(l)	(((l) < 0x80) ? 1 : ((l) < 0x100) ? 2 : \
+	((l) < 0x10000) ? 3 : ((l) < 0x1000000) ? 4 : 5)
+
+static void
+entry_putlen(unsigned char **buf, ber_len_t len)
+{
+	ber_len_t lenlen = entry_lenlen(len);
+
+	if (lenlen == 1) {
+		**buf = (unsigned char) len;
+	} else {
+		int i;
+		**buf = 0x80 | ((unsigned char) lenlen - 1);
+		for (i=lenlen-1; i>0; i--) {
+			(*buf)[i] = (unsigned char) len;
+			len >>= 8;
+		}
+	}
+	*buf += lenlen;
+}
+
+static ber_len_t
+entry_getlen(unsigned char **buf)
+{
+	ber_len_t len;
+	int i;
+
+	len = *(*buf)++;
+	if (len <= 0x7f)
+		return len;
+	i = len & 0x7f;
+	len = 0;
+	for (;i > 0; i--) {
+		len <<= 8;
+		len |= *(*buf)++;
+	}
+	return len;
+}
+
+/* Count up the sizes of the components of an entry */
+void entry_partsize(Entry *e, ber_len_t *plen,
+	int *pnattrs, int *pnvals, int norm)
+{
+	ber_len_t len, dnlen, ndnlen;
+	int i, nat = 0, nval = 0;
+	Attribute *a;
+
+	dnlen = e->e_name.bv_len;
+	len = dnlen + 1;	/* trailing NUL byte */
+	len += entry_lenlen(dnlen);
+	if (norm) {
+		ndnlen = e->e_nname.bv_len;
+		len += ndnlen + 1;
+		len += entry_lenlen(ndnlen);
+	}
+	for (a=e->e_attrs; a; a=a->a_next) {
+		/* For AttributeDesc, we only store the attr name */
+		nat++;
+		len += a->a_desc->ad_cname.bv_len+1;
+		len += entry_lenlen(a->a_desc->ad_cname.bv_len);
+		for (i=0; a->a_vals[i].bv_val; i++) {
+			nval++;
+			len += a->a_vals[i].bv_len + 1;
+			len += entry_lenlen(a->a_vals[i].bv_len);
+		}
+		len += entry_lenlen(i);
+		nval++;	/* empty berval at end */
+		if (norm && a->a_nvals != a->a_vals) {
+			for (i=0; a->a_nvals[i].bv_val; i++) {
+				nval++;
+				len += a->a_nvals[i].bv_len + 1;
+				len += entry_lenlen(a->a_nvals[i].bv_len);
+			}
+			len += entry_lenlen(i);	/* i nvals */
+			nval++;
+		} else {
+			len += entry_lenlen(0);	/* 0 nvals */
+		}
+	}
+	len += entry_lenlen(nat);
+	len += entry_lenlen(nval);
+	*plen = len;
+	*pnattrs = nat;
+	*pnvals = nval;
+}
+
+/* Add up the size of the entry for a flattened buffer */
+ber_len_t entry_flatsize(Entry *e, int norm)
+{
+	ber_len_t len;
+	int nattrs, nvals;
+
+	entry_partsize(e, &len, &nattrs, &nvals, norm);
+	len += sizeof(Entry) + (nattrs * sizeof(Attribute)) +
+		(nvals * sizeof(struct berval));
+	return len;
+}
+
+/* Flatten an Entry into a buffer. The buffer is filled with just the
+ * strings/bervals of all the entry components. Each field is preceded
+ * by its length, encoded the way ber_put_len works. Every field is NUL
+ * terminated.  The entire buffer size is precomputed so that a single
+ * malloc can be performed. The entry size is also recorded,
+ * to aid in entry_decode.
+ */
+int entry_encode(Entry *e, struct berval *bv)
+{
+	ber_len_t len, dnlen, ndnlen, i;
+	int nattrs, nvals;
+	Attribute *a;
+	unsigned char *ptr;
+
+	Debug( LDAP_DEBUG_TRACE, "=> entry_encode(0x%08lx): %s\n",
+		(long) e->e_id, e->e_dn );
+
+	dnlen = e->e_name.bv_len;
+	ndnlen = e->e_nname.bv_len;
+
+	entry_partsize( e, &len, &nattrs, &nvals, 1 );
+
+	bv->bv_len = len;
+	bv->bv_val = ch_malloc(len);
+	ptr = (unsigned char *)bv->bv_val;
+	entry_putlen(&ptr, nattrs);
+	entry_putlen(&ptr, nvals);
+	entry_putlen(&ptr, dnlen);
+	AC_MEMCPY(ptr, e->e_dn, dnlen);
+	ptr += dnlen;
+	*ptr++ = '\0';
+	entry_putlen(&ptr, ndnlen);
+	AC_MEMCPY(ptr, e->e_ndn, ndnlen);
+	ptr += ndnlen;
+	*ptr++ = '\0';
+
+	for (a=e->e_attrs; a; a=a->a_next) {
+		entry_putlen(&ptr, a->a_desc->ad_cname.bv_len);
+		AC_MEMCPY(ptr, a->a_desc->ad_cname.bv_val,
+			a->a_desc->ad_cname.bv_len);
+		ptr += a->a_desc->ad_cname.bv_len;
+		*ptr++ = '\0';
+		if (a->a_vals) {
+			for (i=0; a->a_vals[i].bv_val; i++);
+			assert( i == a->a_numvals );
+			entry_putlen(&ptr, i);
+			for (i=0; a->a_vals[i].bv_val; i++) {
+				entry_putlen(&ptr, a->a_vals[i].bv_len);
+				AC_MEMCPY(ptr, a->a_vals[i].bv_val,
+					a->a_vals[i].bv_len);
+				ptr += a->a_vals[i].bv_len;
+				*ptr++ = '\0';
+			}
+			if (a->a_nvals != a->a_vals) {
+				entry_putlen(&ptr, i);
+				for (i=0; a->a_nvals[i].bv_val; i++) {
+					entry_putlen(&ptr, a->a_nvals[i].bv_len);
+					AC_MEMCPY(ptr, a->a_nvals[i].bv_val,
+					a->a_nvals[i].bv_len);
+					ptr += a->a_nvals[i].bv_len;
+					*ptr++ = '\0';
+				}
+			} else {
+				entry_putlen(&ptr, 0);
+			}
+		}
+	}
+
+	Debug( LDAP_DEBUG_TRACE, "<= entry_encode(0x%08lx): %s\n",
+		(long) e->e_id, e->e_dn );
+
+	return 0;
+}
+
+/* Retrieve an Entry that was stored using entry_encode above.
+ * First entry_header must be called to decode the size of the entry.
+ * Then a single block of memory must be malloc'd to accommodate the
+ * bervals and the bulk data. Next the bulk data is retrieved from
+ * the DB and parsed by entry_decode.
+ *
+ * Note: everything is stored in a single contiguous block, so
+ * you can not free individual attributes or names from this
+ * structure. Attempting to do so will likely corrupt memory.
+ */
+int entry_header(EntryHeader *eh)
+{
+	unsigned char *ptr = (unsigned char *)eh->bv.bv_val;
+
+	/* Some overlays can create empty entries
+	 * so don't check for zeros here.
+	 */
+	eh->nattrs = entry_getlen(&ptr);
+	eh->nvals = entry_getlen(&ptr);
+	eh->data = (char *)ptr;
+	return LDAP_SUCCESS;
+}
+
+int
+entry_decode_dn( EntryHeader *eh, struct berval *dn, struct berval *ndn )
+{
+	int i;
+	unsigned char *ptr = (unsigned char *)eh->bv.bv_val;
+
+	assert( dn != NULL || ndn != NULL );
+
+	ptr = (unsigned char *)eh->data;
+	i = entry_getlen(&ptr);
+	if ( dn != NULL ) {
+		dn->bv_val = (char *) ptr;
+		dn->bv_len = i;
+	}
+
+	if ( ndn != NULL ) {
+		ptr += i + 1;
+		i = entry_getlen(&ptr);
+		ndn->bv_val = (char *) ptr;
+		ndn->bv_len = i;
+	}
+
+	Debug( LDAP_DEBUG_TRACE,
+		"entry_decode_dn: \"%s\"\n",
+		dn ? dn->bv_val : ndn->bv_val );
+
+	return 0;
+}
+
+#ifdef SLAP_ZONE_ALLOC
+int entry_decode(EntryHeader *eh, Entry **e, void *ctx)
+#else
+int entry_decode(EntryHeader *eh, Entry **e)
+#endif
+{
+	int i, j, nattrs, nvals;
+	int rc;
+	Attribute *a;
+	Entry *x;
+	const char *text;
+	AttributeDescription *ad;
+	unsigned char *ptr = (unsigned char *)eh->bv.bv_val;
+	BerVarray bptr;
+
+	nattrs = eh->nattrs;
+	nvals = eh->nvals;
+	x = entry_alloc();
+	x->e_attrs = attrs_alloc( nattrs );
+	ptr = (unsigned char *)eh->data;
+	i = entry_getlen(&ptr);
+	x->e_name.bv_val = (char *) ptr;
+	x->e_name.bv_len = i;
+	ptr += i+1;
+	i = entry_getlen(&ptr);
+	x->e_nname.bv_val = (char *) ptr;
+	x->e_nname.bv_len = i;
+	ptr += i+1;
+	Debug( LDAP_DEBUG_TRACE,
+		"entry_decode: \"%s\"\n",
+		x->e_dn );
+	x->e_bv = eh->bv;
+
+	a = x->e_attrs;
+	bptr = (BerVarray)eh->bv.bv_val;
+
+	while (((char *)ptr - eh->bv.bv_val < eh->bv.bv_len) &&
+	       (i = entry_getlen(&ptr))) {
+		struct berval bv;
+		bv.bv_len = i;
+		bv.bv_val = (char *) ptr;
+		ad = NULL;
+		rc = slap_bv2ad( &bv, &ad, &text );
+
+		if( rc != LDAP_SUCCESS ) {
+			Debug( LDAP_DEBUG_TRACE,
+				"<= entry_decode: str2ad(%s): %s\n", ptr, text );
+			rc = slap_bv2undef_ad( &bv, &ad, &text, 0 );
+
+			if( rc != LDAP_SUCCESS ) {
+				Debug( LDAP_DEBUG_ANY,
+					"<= entry_decode: slap_str2undef_ad(%s): %s\n",
+						ptr, text );
+				return rc;
+			}
+		}
+		ptr += i + 1;
+		a->a_desc = ad;
+		a->a_flags = SLAP_ATTR_DONT_FREE_DATA | SLAP_ATTR_DONT_FREE_VALS;
+		j = entry_getlen(&ptr);
+		a->a_numvals = j;
+		a->a_vals = bptr;
+
+		while (j) {
+			i = entry_getlen(&ptr);
+			bptr->bv_len = i;
+			bptr->bv_val = (char *)ptr;
+			ptr += i+1;
+			bptr++;
+			j--;
+		}
+		bptr->bv_val = NULL;
+		bptr->bv_len = 0;
+		bptr++;
+
+		j = entry_getlen(&ptr);
+		if (j) {
+			a->a_nvals = bptr;
+			while (j) {
+				i = entry_getlen(&ptr);
+				bptr->bv_len = i;
+				bptr->bv_val = (char *)ptr;
+				ptr += i+1;
+				bptr++;
+				j--;
+			}
+			bptr->bv_val = NULL;
+			bptr->bv_len = 0;
+			bptr++;
+		} else {
+			a->a_nvals = a->a_vals;
+		}
+		/* FIXME: This is redundant once a sorted entry is saved into the DB */
+		if ( a->a_desc->ad_type->sat_flags & SLAP_AT_SORTED_VAL ) {
+			rc = slap_sort_vals( (Modifications *)a, &text, &j, NULL );
+			if ( rc == LDAP_SUCCESS ) {
+				a->a_flags |= SLAP_ATTR_SORTED_VALS;
+			} else if ( rc == LDAP_TYPE_OR_VALUE_EXISTS ) {
+				/* should never happen */
+				Debug( LDAP_DEBUG_ANY,
+					"entry_decode: attributeType %s value #%d provided more than once\n",
+					a->a_desc->ad_cname.bv_val, j );
+				return rc;
+			}
+		}
+		a = a->a_next;
+		nattrs--;
+		if ( !nattrs )
+			break;
+	}
+
+	Debug(LDAP_DEBUG_TRACE, "<= entry_decode(%s)\n",
+		x->e_dn );
+	*e = x;
+	return 0;
+}
+
+Entry *
+entry_dup2( Entry *dest, Entry *source )
+{
+	assert( dest != NULL );
+	assert( source != NULL );
+
+	assert( dest->e_private == NULL );
+
+	dest->e_id = source->e_id;
+	ber_dupbv( &dest->e_name, &source->e_name );
+	ber_dupbv( &dest->e_nname, &source->e_nname );
+	dest->e_attrs = attrs_dup( source->e_attrs );
+	dest->e_ocflags = source->e_ocflags;
+
+	return dest;
+}
+
+Entry *
+entry_dup( Entry *e )
+{
+	return entry_dup2( entry_alloc(), e );
+}
+
+#if 1
+/* Duplicates an entry using a single malloc. Saves CPU time, increases
+ * heap usage because a single large malloc is harder to satisfy than
+ * lots of small ones, and the freed space isn't as easily reusable.
+ *
+ * Probably not worth using this function.
+ */
+Entry *entry_dup_bv( Entry *e )
+{
+	ber_len_t len;
+	int nattrs, nvals;
+	Entry *ret;
+	struct berval *bvl;
+	char *ptr;
+	Attribute *src, *dst;
+
+	ret = entry_alloc();
+
+	entry_partsize(e, &len, &nattrs, &nvals, 1);
+	ret->e_id = e->e_id;
+	ret->e_attrs = attrs_alloc( nattrs );
+	ret->e_ocflags = e->e_ocflags;
+	ret->e_bv.bv_len = len + nvals * sizeof(struct berval);
+	ret->e_bv.bv_val = ch_malloc( ret->e_bv.bv_len );
+
+	bvl = (struct berval *)ret->e_bv.bv_val;
+	ptr = (char *)(bvl + nvals);
+
+	ret->e_name.bv_len = e->e_name.bv_len;
+	ret->e_name.bv_val = ptr;
+	AC_MEMCPY( ptr, e->e_name.bv_val, e->e_name.bv_len );
+	ptr += e->e_name.bv_len;
+	*ptr++ = '\0';
+
+	ret->e_nname.bv_len = e->e_nname.bv_len;
+	ret->e_nname.bv_val = ptr;
+	AC_MEMCPY( ptr, e->e_nname.bv_val, e->e_nname.bv_len );
+	ptr += e->e_name.bv_len;
+	*ptr++ = '\0';
+
+	dst = ret->e_attrs;
+	for (src = e->e_attrs; src; src=src->a_next,dst=dst->a_next ) {
+		int i;
+		dst->a_desc = src->a_desc;
+		dst->a_flags = SLAP_ATTR_DONT_FREE_DATA | SLAP_ATTR_DONT_FREE_VALS;
+		dst->a_vals = bvl;
+		dst->a_numvals = src->a_numvals;
+		for ( i=0; src->a_vals[i].bv_val; i++ ) {
+			bvl->bv_len = src->a_vals[i].bv_len;
+			bvl->bv_val = ptr;
+			AC_MEMCPY( ptr, src->a_vals[i].bv_val, bvl->bv_len );
+			ptr += bvl->bv_len;
+			*ptr++ = '\0';
+			bvl++;
+		}
+		BER_BVZERO(bvl);
+		bvl++;
+		if ( src->a_vals != src->a_nvals ) {
+			dst->a_nvals = bvl;
+			for ( i=0; src->a_nvals[i].bv_val; i++ ) {
+				bvl->bv_len = src->a_nvals[i].bv_len;
+				bvl->bv_val = ptr;
+				AC_MEMCPY( ptr, src->a_nvals[i].bv_val, bvl->bv_len );
+				ptr += bvl->bv_len;
+				*ptr++ = '\0';
+				bvl++;
+			}
+			BER_BVZERO(bvl);
+			bvl++;
+		}
+	}
+	return ret;
+}
+#endif