Adding upstream version 2.5.13+dfsg.upstream/2.5.13+dfsgupstream

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

1 files changed, 3377 insertions, 0 deletions

diff --git a/servers/slapd/slap.h b/servers/slapd/slap.h
new file mode 100644
index 0000000..5cf2f46
--- /dev/null
+++ b/servers/slapd/slap.h
@@ -0,0 +1,3377 @@
+/* slap.h - stand alone ldap server include file */
+/* $OpenLDAP$ */
+/* 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.
+ */
+
+#ifndef _SLAP_H_
+#define _SLAP_H_
+
+#include "ldap_defaults.h"
+
+#include <stdio.h>
+#include <ac/stdlib.h>
+
+#include <sys/types.h>
+#include <ac/syslog.h>
+#include <ac/regex.h>
+#include <ac/signal.h>
+#include <ac/socket.h>
+#include <ac/time.h>
+#include <ac/param.h>
+
+#include "ldap_avl.h"
+
+#ifndef ldap_debug
+#define ldap_debug slap_debug
+#endif
+
+#include "ldap_log.h"
+
+#include <ldap.h>
+#include <ldap_schema.h>
+
+#include "lber_pvt.h"
+#include "ldap_pvt.h"
+#include "ldap_pvt_thread.h"
+#include "ldap_queue.h"
+
+#include "lutil.h"
+
+LDAP_BEGIN_DECL
+
+#ifdef LDAP_DEVEL
+#define LDAP_COLLECTIVE_ATTRIBUTES
+#define LDAP_COMP_MATCH
+#define LDAP_SYNC_TIMESTAMP
+#define SLAP_CONTROL_X_WHATFAILED
+#ifndef SLAP_SCHEMA_EXPOSE
+#define SLAP_SCHEMA_EXPOSE
+#endif
+#endif
+
+#define SLAP_CONFIG_DELETE
+#define SLAP_AUXPROP_DONTUSECOPY
+#define LDAP_DYNAMIC_OBJECTS
+#define SLAP_CONTROL_X_TREE_DELETE LDAP_CONTROL_X_TREE_DELETE
+#define SLAP_CONTROL_X_SESSION_TRACKING
+#define SLAP_DISTPROC
+#define SLAP_CONTROL_X_LAZY_COMMIT
+
+#ifndef SLAP_STATS_ETIME
+#define SLAP_STATS_ETIME	1 /* microsecond op timing */
+#endif
+
+/*
+ * SLAPD Memory allocation macros
+ *
+ * Unlike ch_*() routines, these routines do not assert() upon
+ * allocation error.  They are intended to be used instead of
+ * ch_*() routines where the caller has implemented proper
+ * checking for and handling of allocation errors.
+ *
+ * Patches to convert ch_*() calls to SLAP_*() calls welcomed.
+ */
+#define SLAP_MALLOC(s)      ber_memalloc((s))
+#define SLAP_CALLOC(n,s)    ber_memcalloc((n),(s))
+#define SLAP_REALLOC(p,s)   ber_memrealloc((p),(s))
+#define SLAP_FREE(p)        ber_memfree((p))
+#define SLAP_VFREE(v)       ber_memvfree((void**)(v))
+#define SLAP_STRDUP(s)      ber_strdup((s))
+#define SLAP_STRNDUP(s,l)   ber_strndup((s),(l))
+
+#ifdef f_next
+#undef f_next /* name conflict between sys/file.h on SCO and struct filter */
+#endif
+
+#define SERVICE_NAME  OPENLDAP_PACKAGE "-slapd"
+#define SLAPD_ANONYMOUS ""
+
+#ifdef HAVE_TCPD
+# include <tcpd.h>
+# define SLAP_STRING_UNKNOWN	STRING_UNKNOWN
+#else /* ! TCP Wrappers */
+# define SLAP_STRING_UNKNOWN	"unknown"
+#endif /* ! TCP Wrappers */
+
+/* LDAPMod.mod_op value ===> Must be kept in sync with ldap.h! */
+/* These values are used internally by the backends. */
+/* SLAP_MOD_SOFTADD allows adding values that already exist without getting
+ * an error as required by modrdn when the new rdn was already an attribute
+ * value itself.
+ */
+#define SLAP_MOD_SOFTADD		0x1000
+/* SLAP_MOD_SOFTDEL allows deleting values if they exist without getting
+ * an error otherwise.
+ */
+#define SLAP_MOD_SOFTDEL		0x1001
+/* SLAP_MOD_ADD_IF_NOT_PRESENT allows adding values unless the attribute
+ * is already present without getting an error.
+ */
+#define SLAP_MOD_ADD_IF_NOT_PRESENT	0x1002
+/* SLAP_MOD_DEL_IF_PRESENT allows deleting values if the attribute
+ * is present, without getting an error otherwise.
+ * The semantics can be obtained using SLAP_MOD_SOFTDEL with NULL values.
+ */
+
+#define MAXREMATCHES (100)
+
+#define SLAP_MAX_WORKER_THREADS		(16)
+
+#define SLAP_SB_MAX_INCOMING_DEFAULT ((1<<18) - 1)
+#define SLAP_SB_MAX_INCOMING_AUTH ((1<<24) - 1)
+
+#define SLAP_CONN_MAX_PENDING_DEFAULT	100
+#define SLAP_CONN_MAX_PENDING_AUTH	1000
+#define SLAP_MAX_FILTER_DEPTH_DEFAULT	1000
+
+#define SLAP_TEXT_BUFLEN (256)
+
+/* pseudo error code indicating abandoned operation */
+#define SLAPD_ABANDON (-1024)
+
+/* pseudo error code indicating disconnect */
+#define SLAPD_DISCONNECT (-1025)
+
+/* unknown config file directive */
+#define SLAP_CONF_UNKNOWN (-1026)
+
+/* pseudo error code indicating async operation */
+#define SLAPD_ASYNCOP (-1027)
+
+/* We assume "C" locale, that is US-ASCII */
+#define ASCII_SPACE(c)	( (c) == ' ' )
+#define ASCII_LOWER(c)	( (c) >= 'a' && (c) <= 'z' )
+#define ASCII_UPPER(c)	( (c) >= 'A' && (c) <= 'Z' )
+#define ASCII_ALPHA(c)	( ASCII_LOWER(c) || ASCII_UPPER(c) )
+#define ASCII_DIGIT(c)	( (c) >= '0' && (c) <= '9' )
+#define ASCII_HEXLOWER(c)	( (c) >= 'a' && (c) <= 'f' )
+#define ASCII_HEXUPPER(c)	( (c) >= 'A' && (c) <= 'F' )
+#define ASCII_HEX(c)	( ASCII_DIGIT(c) || \
+	ASCII_HEXLOWER(c) || ASCII_HEXUPPER(c) )
+#define ASCII_ALNUM(c)	( ASCII_ALPHA(c) || ASCII_DIGIT(c) )
+#define ASCII_PRINTABLE(c) ( (c) >= ' ' && (c) <= '~' )
+
+#define SLAP_NIBBLE(c) ((c)&0x0f)
+#define SLAP_ESCAPE_CHAR ('\\')
+#define SLAP_ESCAPE_LO(c) ( "0123456789ABCDEF"[SLAP_NIBBLE(c)] )
+#define SLAP_ESCAPE_HI(c) ( SLAP_ESCAPE_LO((c)>>4) )
+
+#define FILTER_ESCAPE(c) ( (c) == '*' || (c) == '\\' \
+	|| (c) == '(' || (c) == ')' || !ASCII_PRINTABLE(c) )
+
+#define DN_ESCAPE(c)	((c) == SLAP_ESCAPE_CHAR)
+/* NOTE: for consistency, this macro must only operate
+ * on normalized/pretty DN, such that ';' is never used
+ * as RDN separator, and all occurrences of ';' must be escaped */
+#define DN_SEPARATOR(c)	((c) == ',')
+#define RDN_ATTRTYPEANDVALUE_SEPARATOR(c) ((c) == '+') /* RFC 4514 */
+#define RDN_SEPARATOR(c) (DN_SEPARATOR(c) || RDN_ATTRTYPEANDVALUE_SEPARATOR(c))
+#define RDN_NEEDSESCAPE(c)	((c) == '\\' || (c) == '"')
+
+#define DESC_LEADCHAR(c)	( ASCII_ALPHA(c) )
+#define DESC_CHAR(c)	( ASCII_ALNUM(c) || (c) == '-' )
+#define OID_LEADCHAR(c)	( ASCII_DIGIT(c) )
+#define OID_SEPARATOR(c)	( (c) == '.' )
+#define OID_CHAR(c)	( OID_LEADCHAR(c) || OID_SEPARATOR(c) )
+
+#define ATTR_LEADCHAR(c)	( DESC_LEADCHAR(c) || OID_LEADCHAR(c) )
+#define ATTR_CHAR(c)	( DESC_CHAR((c)) || OID_SEPARATOR(c) )
+
+#define AD_LEADCHAR(c)	( ATTR_LEADCHAR(c) )
+#define AD_CHAR(c)		( ATTR_CHAR(c) || (c) == ';' )
+
+#define SLAP_NUMERIC(c) ( ASCII_DIGIT(c) || ASCII_SPACE(c) )
+
+#define SLAP_PRINTABLE(c)	( ASCII_ALNUM(c) || (c) == '\'' || \
+	(c) == '(' || (c) == ')' || (c) == '+' || (c) == ',' || \
+	(c) == '-' || (c) == '.' || (c) == '/' || (c) == ':' || \
+	(c) == '?' || (c) == ' ' || (c) == '=' )
+#define SLAP_PRINTABLES(c)	( SLAP_PRINTABLE(c) || (c) == '$' )
+
+/* must match in schema_init.c */
+#define SLAPD_DN_SYNTAX			"1.3.6.1.4.1.1466.115.121.1.12"
+#define SLAPD_NAMEUID_SYNTAX	"1.3.6.1.4.1.1466.115.121.1.34"
+#define SLAPD_INTEGER_SYNTAX	"1.3.6.1.4.1.1466.115.121.1.27"
+#define SLAPD_GROUP_ATTR		"member"
+#define SLAPD_GROUP_CLASS		"groupOfNames"
+#define SLAPD_ROLE_ATTR			"roleOccupant"
+#define SLAPD_ROLE_CLASS		"organizationalRole"
+
+#define SLAPD_TOP_OID			"2.5.6.0"
+
+LDAP_SLAPD_V (int) slap_debug;
+
+typedef unsigned long slap_mask_t;
+
+/* Security Strength Factor */
+typedef unsigned slap_ssf_t;
+
+typedef struct slap_ssf_set {
+	slap_ssf_t sss_ssf;
+	slap_ssf_t sss_transport;
+	slap_ssf_t sss_tls;
+	slap_ssf_t sss_sasl;
+	slap_ssf_t sss_update_ssf;
+	slap_ssf_t sss_update_transport;
+	slap_ssf_t sss_update_tls;
+	slap_ssf_t sss_update_sasl;
+	slap_ssf_t sss_simple_bind;
+} slap_ssf_set_t;
+
+/* Flags for telling slap_sasl_getdn() what type of identity is being passed */
+#define SLAP_GETDN_AUTHCID 2
+#define SLAP_GETDN_AUTHZID 4
+
+/*
+ * Index types
+ */
+#define SLAP_INDEX_TYPE           0x00FFUL
+#define SLAP_INDEX_UNDEFINED      0x0001UL
+#define SLAP_INDEX_PRESENT        0x0002UL
+#define SLAP_INDEX_EQUALITY       0x0004UL
+#define SLAP_INDEX_APPROX         0x0008UL
+#define SLAP_INDEX_SUBSTR         0x0010UL
+#define SLAP_INDEX_EXTENDED		  0x0020UL
+
+#define SLAP_INDEX_DEFAULT        SLAP_INDEX_EQUALITY
+
+#define IS_SLAP_INDEX(mask, type)	(((mask) & (type)) == (type))
+
+#define SLAP_INDEX_SUBSTR_TYPE    0x0F00UL
+
+#define SLAP_INDEX_SUBSTR_INITIAL ( SLAP_INDEX_SUBSTR | 0x0100UL ) 
+#define SLAP_INDEX_SUBSTR_ANY     ( SLAP_INDEX_SUBSTR | 0x0200UL )
+#define SLAP_INDEX_SUBSTR_FINAL   ( SLAP_INDEX_SUBSTR | 0x0400UL )
+#define SLAP_INDEX_SUBSTR_DEFAULT \
+	( SLAP_INDEX_SUBSTR \
+	| SLAP_INDEX_SUBSTR_INITIAL \
+	| SLAP_INDEX_SUBSTR_ANY \
+	| SLAP_INDEX_SUBSTR_FINAL )
+
+/* defaults for initial/final substring indices */
+#define SLAP_INDEX_SUBSTR_IF_MINLEN_DEFAULT	2
+#define SLAP_INDEX_SUBSTR_IF_MAXLEN_DEFAULT	4
+
+/* defaults for any substring indices */
+#define SLAP_INDEX_SUBSTR_ANY_LEN_DEFAULT		4
+#define SLAP_INDEX_SUBSTR_ANY_STEP_DEFAULT		2
+
+/* default for ordered integer index keys */
+#define SLAP_INDEX_INTLEN_DEFAULT	4
+
+#define SLAP_INDEX_FLAGS         0xF000UL
+#define SLAP_INDEX_NOSUBTYPES    0x1000UL /* don't use index w/ subtypes */
+#define SLAP_INDEX_NOTAGS        0x2000UL /* don't use index w/ tags */
+
+/*
+ * there is a single index for each attribute.  these prefixes ensure
+ * that there is no collision among keys.
+ */
+#define SLAP_INDEX_EQUALITY_PREFIX	'=' 	/* prefix for equality keys     */
+#define SLAP_INDEX_APPROX_PREFIX	'~'		/* prefix for approx keys       */
+#define SLAP_INDEX_SUBSTR_PREFIX	'*'		/* prefix for substring keys    */
+#define SLAP_INDEX_SUBSTR_INITIAL_PREFIX '^'
+#define SLAP_INDEX_SUBSTR_FINAL_PREFIX '$'
+#define SLAP_INDEX_CONT_PREFIX		'.'		/* prefix for continuation keys */
+
+#define SLAP_SYNTAX_MATCHINGRULES_OID	 "1.3.6.1.4.1.1466.115.121.1.30"
+#define SLAP_SYNTAX_ATTRIBUTETYPES_OID	 "1.3.6.1.4.1.1466.115.121.1.3"
+#define SLAP_SYNTAX_OBJECTCLASSES_OID	 "1.3.6.1.4.1.1466.115.121.1.37"
+#define SLAP_SYNTAX_MATCHINGRULEUSES_OID "1.3.6.1.4.1.1466.115.121.1.31"
+#define SLAP_SYNTAX_CONTENTRULE_OID	 "1.3.6.1.4.1.1466.115.121.1.16"
+
+/*
+ * represents schema information for a database
+ */
+enum {
+	SLAP_SCHERR_OUTOFMEM = 1,
+	SLAP_SCHERR_CLASS_NOT_FOUND,
+	SLAP_SCHERR_CLASS_BAD_USAGE,
+	SLAP_SCHERR_CLASS_BAD_SUP,
+	SLAP_SCHERR_CLASS_DUP,
+	SLAP_SCHERR_CLASS_INCONSISTENT,
+	SLAP_SCHERR_ATTR_NOT_FOUND,
+	SLAP_SCHERR_ATTR_BAD_MR,
+	SLAP_SCHERR_ATTR_BAD_USAGE,
+	SLAP_SCHERR_ATTR_BAD_SUP,
+	SLAP_SCHERR_ATTR_INCOMPLETE,
+	SLAP_SCHERR_ATTR_DUP,
+	SLAP_SCHERR_ATTR_INCONSISTENT,
+	SLAP_SCHERR_MR_NOT_FOUND,
+	SLAP_SCHERR_MR_INCOMPLETE,
+	SLAP_SCHERR_MR_DUP,
+	SLAP_SCHERR_SYN_NOT_FOUND,
+	SLAP_SCHERR_SYN_DUP,
+	SLAP_SCHERR_SYN_SUP_NOT_FOUND,
+	SLAP_SCHERR_SYN_SUBST_NOT_SPECIFIED,
+	SLAP_SCHERR_SYN_SUBST_NOT_FOUND,
+	SLAP_SCHERR_NO_NAME,
+	SLAP_SCHERR_NOT_SUPPORTED,
+	SLAP_SCHERR_BAD_DESCR,
+	SLAP_SCHERR_OIDM,
+	SLAP_SCHERR_CR_DUP,
+	SLAP_SCHERR_CR_BAD_STRUCT,
+	SLAP_SCHERR_CR_BAD_AUX,
+	SLAP_SCHERR_CR_BAD_AT,
+
+	SLAP_SCHERR_LAST
+};
+
+/* forward declarations */
+typedef struct Syntax Syntax;
+typedef struct MatchingRule MatchingRule;
+typedef struct MatchingRuleUse MatchingRuleUse;
+typedef struct MatchingRuleAssertion MatchingRuleAssertion;
+typedef struct OidMacro OidMacro;
+typedef struct ObjectClass ObjectClass;
+typedef struct AttributeType AttributeType;
+typedef struct AttributeDescription AttributeDescription;
+typedef struct AttributeName AttributeName;
+typedef struct ContentRule ContentRule;
+
+typedef struct AttributeAssertion AttributeAssertion;
+typedef struct SubstringsAssertion SubstringsAssertion;
+typedef struct Filter Filter;
+typedef struct ValuesReturnFilter ValuesReturnFilter;
+typedef struct Attribute Attribute;
+#ifdef LDAP_COMP_MATCH
+typedef struct ComponentData ComponentData;
+typedef struct ComponentFilter ComponentFilter;
+#endif
+
+typedef struct Entry Entry;
+typedef struct Modification Modification;
+typedef struct Modifications Modifications;
+typedef struct LDAPModList LDAPModList;
+
+typedef struct BackendInfo BackendInfo;		/* per backend type */
+typedef struct BackendDB BackendDB;		/* per backend database */
+
+typedef struct Connection Connection;
+typedef struct Operation Operation;
+typedef struct SlapReply SlapReply;
+/* end of forward declarations */
+
+extern int slap_inet4or6;
+
+struct OidMacro {
+	struct berval som_oid;
+	BerVarray som_names;
+	BerVarray som_subs;
+#define	SLAP_OM_HARDCODE	0x10000U	/* This is hardcoded schema */
+	int som_flags;
+	LDAP_STAILQ_ENTRY(OidMacro) som_next;
+};
+
+typedef int slap_syntax_validate_func LDAP_P((
+	Syntax *syntax,
+	struct berval * in));
+
+typedef int slap_syntax_transform_func LDAP_P((
+	Syntax *syntax,
+	struct berval * in,
+	struct berval * out,
+	void *memctx));
+
+#ifdef LDAP_COMP_MATCH
+typedef void* slap_component_transform_func LDAP_P((
+	struct berval * in ));
+struct ComponentDesc;
+#endif
+
+struct Syntax {
+	LDAPSyntax			ssyn_syn;
+#define ssyn_oid		ssyn_syn.syn_oid
+#define ssyn_desc		ssyn_syn.syn_desc
+#define ssyn_extensions	ssyn_syn.syn_extensions
+	/*
+	 * Note: the former
+	ber_len_t	ssyn_oidlen;
+	 * has been replaced by a struct berval that uses the value
+	 * provided by ssyn_syn.syn_oid; a macro that expands to
+	 * the bv_len field of the berval is provided for backward
+	 * compatibility.  CAUTION: NEVER FREE THE BERVAL
+	 */
+	struct berval	ssyn_bvoid;
+#define	ssyn_oidlen	ssyn_bvoid.bv_len
+
+	unsigned int ssyn_flags;
+
+#define SLAP_SYNTAX_NONE	0x0000U
+#define SLAP_SYNTAX_BLOB	0x0001U /* syntax treated as blob (audio) */
+#define SLAP_SYNTAX_BINARY	0x0002U /* binary transfer required (certificate) */
+#define SLAP_SYNTAX_BER		0x0004U /* stored in BER encoding (certificate) */
+#ifdef SLAP_SCHEMA_EXPOSE
+#define SLAP_SYNTAX_HIDE	0x0000U /* publish everything */
+#else
+#define SLAP_SYNTAX_HIDE	0x8000U /* hide (do not publish) */
+#endif
+#define	SLAP_SYNTAX_HARDCODE	0x10000U	/* This is hardcoded schema */
+#define	SLAP_SYNTAX_DN		0x20000U	/* Treat like a DN */
+
+	Syntax				**ssyn_sups;
+
+	slap_syntax_validate_func	*ssyn_validate;
+	slap_syntax_transform_func	*ssyn_pretty;
+
+#ifdef SLAPD_BINARY_CONVERSION
+	/* convert to and from binary */
+	slap_syntax_transform_func	*ssyn_ber2str;
+	slap_syntax_transform_func	*ssyn_str2ber;
+#endif
+#ifdef LDAP_COMP_MATCH
+	slap_component_transform_func *ssyn_attr2comp;
+	struct ComponentDesc* ssync_comp_syntax;
+#endif
+
+	LDAP_STAILQ_ENTRY(Syntax)	ssyn_next;
+};
+
+#define slap_syntax_is_flag(s,flag) ((int)((s)->ssyn_flags & (flag)) ? 1 : 0)
+#define slap_syntax_is_blob(s)		slap_syntax_is_flag((s),SLAP_SYNTAX_BLOB)
+#define slap_syntax_is_binary(s)	slap_syntax_is_flag((s),SLAP_SYNTAX_BINARY)
+#define slap_syntax_is_ber(s)		slap_syntax_is_flag((s),SLAP_SYNTAX_BER)
+#define slap_syntax_is_hidden(s)	slap_syntax_is_flag((s),SLAP_SYNTAX_HIDE)
+
+typedef struct slap_syntax_defs_rec {
+	char *sd_desc;
+	int sd_flags;
+	char **sd_sups;
+	slap_syntax_validate_func *sd_validate;
+	slap_syntax_transform_func *sd_pretty;
+#ifdef SLAPD_BINARY_CONVERSION
+	slap_syntax_transform_func *sd_ber2str;
+	slap_syntax_transform_func *sd_str2ber;
+#endif
+} slap_syntax_defs_rec;
+
+/* X -> Y Converter */
+typedef int slap_mr_convert_func LDAP_P((
+	struct berval * in,
+	struct berval * out,
+	void *memctx ));
+
+/* Normalizer */
+typedef int slap_mr_normalize_func LDAP_P((
+	slap_mask_t use,
+	Syntax *syntax, /* NULL if in is asserted value */
+	MatchingRule *mr,
+	struct berval *in,
+	struct berval *out,
+	void *memctx ));
+
+/* Match (compare) function */
+typedef int slap_mr_match_func LDAP_P((
+	int *match,
+	slap_mask_t use,
+	Syntax *syntax,	/* syntax of stored value */
+	MatchingRule *mr,
+	struct berval *value,
+	void *assertValue ));
+
+/* Index generation function */
+typedef int slap_mr_indexer_func LDAP_P((
+	slap_mask_t use,
+	slap_mask_t mask,
+	Syntax *syntax,	/* syntax of stored value */
+	MatchingRule *mr,
+	struct berval *prefix,
+	BerVarray values,
+	BerVarray *keys,
+	void *memctx ));
+
+/* Filter index function */
+typedef int slap_mr_filter_func LDAP_P((
+	slap_mask_t use,
+	slap_mask_t mask,
+	Syntax *syntax,	/* syntax of stored value */
+	MatchingRule *mr,
+	struct berval *prefix,
+	void *assertValue,
+	BerVarray *keys,
+	void *memctx ));
+
+struct MatchingRule {
+	LDAPMatchingRule		smr_mrule;
+	MatchingRuleUse			*smr_mru;
+	/* RFC 4512 string representation */
+	struct berval			smr_str;
+	/*
+	 * Note: the former
+	 *			ber_len_t	smr_oidlen;
+	 * has been replaced by a struct berval that uses the value
+	 * provided by smr_mrule.mr_oid; a macro that expands to
+	 * the bv_len field of the berval is provided for backward
+	 * compatibility.  CAUTION: NEVER FREE THE BERVAL
+	 */
+	struct berval			smr_bvoid;
+#define	smr_oidlen			smr_bvoid.bv_len
+
+	slap_mask_t			smr_usage;
+
+#ifdef SLAP_SCHEMA_EXPOSE
+#define SLAP_MR_HIDE			0x0000U
+#else
+#define SLAP_MR_HIDE			0x8000U
+#endif
+
+#define SLAP_MR_MUTATION_NORMALIZER	0x4000U
+
+#define SLAP_MR_TYPE_MASK		0x0F00U
+#define SLAP_MR_SUBTYPE_MASK		0x00F0U
+#define SLAP_MR_USAGE			0x000FU
+
+#define SLAP_MR_NONE			0x0000U
+#define SLAP_MR_EQUALITY		0x0100U
+#define SLAP_MR_ORDERING		0x0200U
+#define SLAP_MR_SUBSTR			0x0400U
+#define SLAP_MR_EXT			0x0800U /* implicitly extensible */
+#define	SLAP_MR_ORDERED_INDEX		0x1000U
+#ifdef LDAP_COMP_MATCH
+#define SLAP_MR_COMPONENT		0x2000U
+#endif
+
+#define SLAP_MR_EQUALITY_APPROX	( SLAP_MR_EQUALITY | 0x0010U )
+
+#define SLAP_MR_SUBSTR_INITIAL	( SLAP_MR_SUBSTR | 0x0010U )
+#define SLAP_MR_SUBSTR_ANY	( SLAP_MR_SUBSTR | 0x0020U )
+#define SLAP_MR_SUBSTR_FINAL	( SLAP_MR_SUBSTR | 0x0040U )
+
+
+/*
+ * The asserted value, depending on the particular usage,
+ * is expected to conform to either the assertion syntax
+ * or the attribute syntax.   In some cases, the syntax of
+ * the value is known.  If so, these flags indicate which
+ * syntax the value is expected to conform to.  If not,
+ * neither of these flags is set (until the syntax of the
+ * provided value is determined).  If the value is of the
+ * attribute syntax, the flag is changed once a value of
+ * the assertion syntax is derived from the provided value.
+ */
+#define SLAP_MR_VALUE_OF_ASSERTION_SYNTAX	0x0001U
+#define SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX	0x0002U
+#define SLAP_MR_VALUE_OF_SYNTAX			(SLAP_MR_VALUE_OF_ASSERTION_SYNTAX|SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX)
+#define SLAP_MR_DENORMALIZE			(SLAP_MR_MUTATION_NORMALIZER)
+
+#define SLAP_MR_IS_VALUE_OF_ATTRIBUTE_SYNTAX( usage ) \
+	((usage) & SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX )
+#define SLAP_MR_IS_VALUE_OF_ASSERTION_SYNTAX( usage ) \
+	((usage) & SLAP_MR_VALUE_OF_ASSERTION_SYNTAX )
+#ifdef LDAP_DEBUG
+#define SLAP_MR_IS_VALUE_OF_SYNTAX( usage ) \
+	((usage) & SLAP_MR_VALUE_OF_SYNTAX)
+#else
+#define SLAP_MR_IS_VALUE_OF_SYNTAX( usage )	(1)
+#endif
+#define SLAP_MR_IS_DENORMALIZE( usage ) \
+	((usage) & SLAP_MR_DENORMALIZE )
+
+/* either or both the asserted value or attribute value
+ * may be provided in normalized form
+ */
+#define SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH		0x0004U
+#define SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH	0x0008U
+
+#define SLAP_IS_MR_ASSERTION_SYNTAX_MATCH( usage ) \
+	(!((usage) & SLAP_MR_ATTRIBUTE_SYNTAX_MATCH))
+#define SLAP_IS_MR_ATTRIBUTE_SYNTAX_MATCH( usage ) \
+	((usage) & SLAP_MR_ATTRIBUTE_SYNTAX_MATCH)
+
+#define SLAP_IS_MR_ATTRIBUTE_SYNTAX_CONVERTED_MATCH( usage ) \
+	(((usage) & SLAP_MR_ATTRIBUTE_SYNTAX_CONVERTED_MATCH) \
+		== SLAP_MR_ATTRIBUTE_SYNTAX_CONVERTED_MATCH)
+#define SLAP_IS_MR_ATTRIBUTE_SYNTAX_NONCONVERTED_MATCH( usage ) \
+	(((usage) & SLAP_MR_ATTRIBUTE_SYNTAX_CONVERTED_MATCH) \
+		== SLAP_MR_ATTRIBUTE_SYNTAX_MATCH)
+
+#define SLAP_IS_MR_ASSERTED_VALUE_NORMALIZED_MATCH( usage ) \
+	((usage) & SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH )
+#define SLAP_IS_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH( usage ) \
+	((usage) & SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH )
+
+	Syntax			*smr_syntax;
+	slap_mr_convert_func	*smr_convert;
+	slap_mr_normalize_func	*smr_normalize;
+	slap_mr_match_func	*smr_match;
+	slap_mr_indexer_func	*smr_indexer;
+	slap_mr_filter_func	*smr_filter;
+
+	/*
+	 * null terminated array of syntaxes compatible with this syntax
+	 * note: when MS_EXT is set, this MUST NOT contain the assertion
+	 * syntax of the rule.  When MS_EXT is not set, it MAY.
+	 */
+	Syntax			**smr_compat_syntaxes;
+
+	/*
+	 * For equality rules, refers to an associated approximate rule.
+	 * For non-equality rules, refers to an associated equality rule.
+	 */
+	MatchingRule	*smr_associated;
+
+#define SLAP_MR_ASSOCIATED(mr,amr)	\
+	(((mr) == (amr)) || ((mr)->smr_associated == (amr)))
+
+	LDAP_SLIST_ENTRY(MatchingRule)	smr_next;
+
+#define smr_oid				smr_mrule.mr_oid
+#define smr_names			smr_mrule.mr_names
+#define smr_desc			smr_mrule.mr_desc
+#define smr_obsolete		smr_mrule.mr_obsolete
+#define smr_syntax_oid		smr_mrule.mr_syntax_oid
+#define smr_extensions		smr_mrule.mr_extensions
+};
+
+struct MatchingRuleUse {
+	LDAPMatchingRuleUse		smru_mruleuse;
+	MatchingRule			*smru_mr;
+	/* RFC 4512 string representation */
+	struct berval			smru_str;
+
+	LDAP_SLIST_ENTRY(MatchingRuleUse) smru_next;
+
+#define smru_oid			smru_mruleuse.mru_oid
+#define smru_names			smru_mruleuse.mru_names
+#define smru_desc			smru_mruleuse.mru_desc
+#define smru_obsolete			smru_mruleuse.mru_obsolete
+#define smru_applies_oids		smru_mruleuse.mru_applies_oids
+
+#define smru_usage			smru_mr->smr_usage
+} /* MatchingRuleUse */ ;
+
+typedef struct slap_mrule_defs_rec {
+	char *						mrd_desc;
+	slap_mask_t					mrd_usage;
+	char **						mrd_compat_syntaxes;
+	slap_mr_convert_func *		mrd_convert;
+	slap_mr_normalize_func *	mrd_normalize;
+	slap_mr_match_func *		mrd_match;
+	slap_mr_indexer_func *		mrd_indexer;
+	slap_mr_filter_func *		mrd_filter;
+
+	/* For equality rule, this may refer to an associated approximate rule */
+	/* For non-equality rule, this may refer to an associated equality rule */
+	char *						mrd_associated;
+} slap_mrule_defs_rec;
+
+typedef int (AttributeTypeSchemaCheckFN)(
+	BackendDB *be,
+	Entry *e,
+	Attribute *attr,
+	const char** text,
+	char *textbuf, size_t textlen );
+
+struct AttributeType {
+	LDAPAttributeType		sat_atype;
+	struct berval			sat_cname;
+	AttributeType			*sat_sup;
+	AttributeType			**sat_subtypes;
+	MatchingRule			*sat_equality;
+	MatchingRule			*sat_approx;
+	MatchingRule			*sat_ordering;
+	MatchingRule			*sat_substr;
+	Syntax				*sat_syntax;
+
+	AttributeTypeSchemaCheckFN	*sat_check;
+	char				*sat_oidmacro;	/* attribute OID */
+	char				*sat_soidmacro;	/* syntax OID */
+
+#define SLAP_AT_NONE			0x0000U
+#define SLAP_AT_ABSTRACT		0x0100U /* cannot be instantiated */
+#define SLAP_AT_FINAL			0x0200U /* cannot be subtyped */
+#ifdef SLAP_SCHEMA_EXPOSE
+#define SLAP_AT_HIDE			0x0000U /* publish everything */
+#else
+#define SLAP_AT_HIDE			0x8000U /* hide attribute */
+#endif
+#define	SLAP_AT_DYNAMIC			0x0400U	/* dynamically generated */
+
+#define SLAP_AT_MANAGEABLE		0x0800U	/* no-user-mod can be by-passed */
+
+/* Note: ORDERED values have an ordering specifically set by the
+ * user, denoted by the {x} ordering prefix on the values.
+ *
+ * SORTED values are simply sorted by memcmp. SORTED values can
+ * be efficiently located by binary search. ORDERED values have no
+ * such advantage. An attribute cannot have both properties.
+ */
+#define	SLAP_AT_ORDERED_VAL		0x0001U /* values are ordered */
+#define	SLAP_AT_ORDERED_SIB		0x0002U /* siblings are ordered */
+#define	SLAP_AT_ORDERED			0x0003U /* value has order index */
+
+#define	SLAP_AT_SORTED_VAL		0x0010U	/* values should be sorted */
+
+#define	SLAP_AT_HARDCODE		0x10000U	/* hardcoded schema */
+#define	SLAP_AT_DELETED			0x20000U
+
+	slap_mask_t			sat_flags;
+
+	LDAP_STAILQ_ENTRY(AttributeType) sat_next;
+
+#define sat_oid				sat_atype.at_oid
+#define sat_names			sat_atype.at_names
+#define sat_desc			sat_atype.at_desc
+#define sat_obsolete			sat_atype.at_obsolete
+#define sat_sup_oid			sat_atype.at_sup_oid
+#define sat_equality_oid		sat_atype.at_equality_oid
+#define sat_ordering_oid		sat_atype.at_ordering_oid
+#define sat_substr_oid			sat_atype.at_substr_oid
+#define sat_syntax_oid			sat_atype.at_syntax_oid
+#define sat_single_value		sat_atype.at_single_value
+#define sat_collective			sat_atype.at_collective
+#define sat_no_user_mod			sat_atype.at_no_user_mod
+#define sat_usage			sat_atype.at_usage
+#define sat_extensions			sat_atype.at_extensions
+
+	AttributeDescription		*sat_ad;
+	ldap_pvt_thread_mutex_t		sat_ad_mutex;
+};
+
+#define is_at_operational(at)	((at)->sat_usage)
+#define is_at_single_value(at)	((at)->sat_single_value)
+#define is_at_collective(at)	((at)->sat_collective)
+#define is_at_obsolete(at)		((at)->sat_obsolete)
+#define is_at_no_user_mod(at)	((at)->sat_no_user_mod)
+
+typedef int (ObjectClassSchemaCheckFN)(
+	BackendDB *be,
+	Entry *e,
+	ObjectClass *oc,
+	const char** text,
+	char *textbuf, size_t textlen );
+
+struct ObjectClass {
+	LDAPObjectClass			soc_oclass;
+	struct berval			soc_cname;
+	ObjectClass			**soc_sups;
+	AttributeType			**soc_required;
+	AttributeType			**soc_allowed;
+	ObjectClassSchemaCheckFN	*soc_check;
+	char				*soc_oidmacro;
+	slap_mask_t			soc_flags;
+#define soc_oid				soc_oclass.oc_oid
+#define soc_names			soc_oclass.oc_names
+#define soc_desc			soc_oclass.oc_desc
+#define soc_obsolete			soc_oclass.oc_obsolete
+#define soc_sup_oids			soc_oclass.oc_sup_oids
+#define soc_kind			soc_oclass.oc_kind
+#define soc_at_oids_must		soc_oclass.oc_at_oids_must
+#define soc_at_oids_may			soc_oclass.oc_at_oids_may
+#define soc_extensions			soc_oclass.oc_extensions
+
+	LDAP_STAILQ_ENTRY(ObjectClass)	soc_next;
+};
+
+#define	SLAP_OCF_SET_FLAGS	0x1
+#define	SLAP_OCF_CHECK_SUP	0x2
+#define	SLAP_OCF_MASK		(SLAP_OCF_SET_FLAGS|SLAP_OCF_CHECK_SUP)
+
+#define	SLAP_OC_ALIAS		0x0001
+#define	SLAP_OC_REFERRAL	0x0002
+#define	SLAP_OC_SUBENTRY	0x0004
+#define	SLAP_OC_DYNAMICOBJECT	0x0008
+#define	SLAP_OC_COLLECTIVEATTRIBUTESUBENTRY	0x0010
+#define SLAP_OC_GLUE		0x0020
+#define SLAP_OC_SYNCPROVIDERSUBENTRY		0x0040
+#define SLAP_OC_SYNCCONSUMERSUBENTRY		0x0080
+#define	SLAP_OC__MASK		0x00FF
+#define	SLAP_OC__END		0x0100
+#define SLAP_OC_OPERATIONAL	0x4000
+#ifdef SLAP_SCHEMA_EXPOSE
+#define SLAP_OC_HIDE		0x0000
+#else
+#define SLAP_OC_HIDE		0x8000
+#endif
+#define	SLAP_OC_HARDCODE	0x10000U	/* This is hardcoded schema */
+#define	SLAP_OC_DELETED		0x20000U
+
+/*
+ * DIT content rule
+ */
+struct ContentRule {
+	LDAPContentRule		scr_crule;
+	ObjectClass		*scr_sclass;
+	ObjectClass		**scr_auxiliaries;	/* optional */
+	AttributeType		**scr_required;		/* optional */
+	AttributeType		**scr_allowed;		/* optional */
+	AttributeType		**scr_precluded;	/* optional */
+#define scr_oid			scr_crule.cr_oid
+#define scr_names		scr_crule.cr_names
+#define scr_desc		scr_crule.cr_desc
+#define scr_obsolete		scr_crule.cr_obsolete
+#define scr_oc_oids_aux		scr_crule.cr_oc_oids_aux
+#define scr_at_oids_must	scr_crule.cr_at_oids_must
+#define scr_at_oids_may		scr_crule.cr_at_oids_may
+#define scr_at_oids_not		scr_crule.cr_at_oids_not
+
+	char			*scr_oidmacro;
+#define	SLAP_CR_HARDCODE	0x10000U
+	int			scr_flags;
+
+	LDAP_STAILQ_ENTRY( ContentRule ) scr_next;
+};
+
+/* Represents a recognized attribute description ( type + options ). */
+struct AttributeDescription {
+	AttributeDescription	*ad_next;
+	AttributeType		*ad_type;	/* attribute type, must be specified */
+	struct berval		ad_cname;	/* canonical name, must be specified */
+	struct berval		ad_tags;	/* empty if no tagging options */
+	unsigned ad_flags;
+#define SLAP_DESC_NONE		0x00U
+#define SLAP_DESC_BINARY	0x01U
+#define SLAP_DESC_TAG_RANGE	0x80U
+#define SLAP_DESC_TEMPORARY	0x1000U
+	unsigned ad_index;
+};
+
+/* flags to slap_*2undef_ad to register undefined (0, the default)
+ * or proxied (SLAP_AD_PROXIED) AttributeDescriptions; the additional
+ * SLAP_AD_NOINSERT is to lookup without insert */
+#define SLAP_AD_UNDEF		0x00U
+#define SLAP_AD_PROXIED		0x01U
+#define	SLAP_AD_NOINSERT	0x02U
+
+#define	SLAP_AN_OCEXCLUDE	0x01
+#define	SLAP_AN_OCINITED	0x02
+
+struct AttributeName {
+	struct berval		an_name;
+	AttributeDescription	*an_desc;
+	int			an_flags;
+	ObjectClass		*an_oc;
+};
+
+#define slap_ad_is_tagged(ad)			( (ad)->ad_tags.bv_len != 0 )
+#define slap_ad_is_tag_range(ad)	\
+	( ((ad)->ad_flags & SLAP_DESC_TAG_RANGE) ? 1 : 0 )
+#define slap_ad_is_binary(ad)		\
+	( ((ad)->ad_flags & SLAP_DESC_BINARY) ? 1 : 0 )
+
+/*
+ * pointers to schema elements used internally
+ */
+struct slap_internal_schema {
+	/* objectClass */
+	ObjectClass *si_oc_top;
+	ObjectClass *si_oc_extensibleObject;
+	ObjectClass *si_oc_alias;
+	ObjectClass *si_oc_referral;
+	ObjectClass *si_oc_rootdse;
+	ObjectClass *si_oc_subentry;
+	ObjectClass *si_oc_subschema;
+	ObjectClass *si_oc_collectiveAttributeSubentry;
+	ObjectClass *si_oc_dynamicObject;
+
+	ObjectClass *si_oc_glue;
+	ObjectClass *si_oc_syncConsumerSubentry;
+	ObjectClass *si_oc_syncProviderSubentry;
+
+	/* objectClass attribute descriptions */
+	AttributeDescription *si_ad_objectClass;
+
+	/* operational attribute descriptions */
+	AttributeDescription *si_ad_structuralObjectClass;
+	AttributeDescription *si_ad_creatorsName;
+	AttributeDescription *si_ad_createTimestamp;
+	AttributeDescription *si_ad_modifiersName;
+	AttributeDescription *si_ad_modifyTimestamp;
+	AttributeDescription *si_ad_hasSubordinates;
+	AttributeDescription *si_ad_subschemaSubentry;
+	AttributeDescription *si_ad_collectiveSubentries;
+	AttributeDescription *si_ad_collectiveExclusions;
+	AttributeDescription *si_ad_entryDN;
+	AttributeDescription *si_ad_entryUUID;
+	AttributeDescription *si_ad_entryCSN;
+	AttributeDescription *si_ad_namingCSN;
+
+	AttributeDescription *si_ad_dseType;
+	AttributeDescription *si_ad_syncreplCookie;
+	AttributeDescription *si_ad_syncTimestamp;
+	AttributeDescription *si_ad_contextCSN;
+
+	/* root DSE attribute descriptions */
+	AttributeDescription *si_ad_altServer;
+	AttributeDescription *si_ad_namingContexts;
+	AttributeDescription *si_ad_supportedControl;
+	AttributeDescription *si_ad_supportedExtension;
+	AttributeDescription *si_ad_supportedLDAPVersion;
+	AttributeDescription *si_ad_supportedSASLMechanisms;
+	AttributeDescription *si_ad_supportedFeatures;
+	AttributeDescription *si_ad_monitorContext;
+	AttributeDescription *si_ad_vendorName;
+	AttributeDescription *si_ad_vendorVersion;
+	AttributeDescription *si_ad_configContext;
+
+	/* subentry attribute descriptions */
+	AttributeDescription *si_ad_administrativeRole;
+	AttributeDescription *si_ad_subtreeSpecification;
+
+	/* subschema subentry attribute descriptions */
+	AttributeDescription *si_ad_attributeTypes;
+	AttributeDescription *si_ad_ditContentRules;
+	AttributeDescription *si_ad_ditStructureRules;
+	AttributeDescription *si_ad_ldapSyntaxes;
+	AttributeDescription *si_ad_matchingRules;
+	AttributeDescription *si_ad_matchingRuleUse;
+	AttributeDescription *si_ad_nameForms;
+	AttributeDescription *si_ad_objectClasses;
+
+	/* Aliases & Referrals */
+	AttributeDescription *si_ad_aliasedObjectName;
+	AttributeDescription *si_ad_ref;
+
+	/* Access Control Internals */
+	AttributeDescription *si_ad_entry;
+	AttributeDescription *si_ad_children;
+	AttributeDescription *si_ad_saslAuthzTo;
+	AttributeDescription *si_ad_saslAuthzFrom;
+
+	/* dynamic entries */
+	AttributeDescription *si_ad_entryTtl;
+	AttributeDescription *si_ad_dynamicSubtrees;
+
+	/* Other attributes descriptions */
+	AttributeDescription *si_ad_distinguishedName;
+	AttributeDescription *si_ad_name;
+	AttributeDescription *si_ad_cn;
+	AttributeDescription *si_ad_uid;
+	AttributeDescription *si_ad_uidNumber;
+	AttributeDescription *si_ad_gidNumber;
+	AttributeDescription *si_ad_userPassword;
+	AttributeDescription *si_ad_labeledURI;
+#ifdef SLAPD_AUTHPASSWD
+	AttributeDescription *si_ad_authPassword;
+	AttributeDescription *si_ad_authPasswordSchemes;
+#endif
+	AttributeDescription *si_ad_description;
+	AttributeDescription *si_ad_seeAlso;
+
+	/* privateKeys */
+	AttributeDescription *si_ad_pKCS8PrivateKey;
+
+	/* ppolicy lastbind equivalent */
+	AttributeDescription *si_ad_pwdLastSuccess;
+
+	/* Undefined Attribute Type */
+	AttributeType	*si_at_undefined;
+
+	/* "Proxied" Attribute Type */
+	AttributeType	*si_at_proxied;
+
+	/* Matching Rules */
+	MatchingRule	*si_mr_distinguishedNameMatch;
+	MatchingRule	*si_mr_dnSubtreeMatch;
+	MatchingRule	*si_mr_dnOneLevelMatch;
+	MatchingRule	*si_mr_dnSubordinateMatch;
+	MatchingRule	*si_mr_dnSuperiorMatch;
+	MatchingRule    *si_mr_caseExactMatch;
+	MatchingRule    *si_mr_caseExactSubstringsMatch;
+	MatchingRule    *si_mr_caseExactIA5Match;
+	MatchingRule	*si_mr_integerMatch;
+	MatchingRule    *si_mr_integerFirstComponentMatch;
+	MatchingRule    *si_mr_objectIdentifierFirstComponentMatch;
+	MatchingRule    *si_mr_caseIgnoreMatch;
+	MatchingRule    *si_mr_caseIgnoreListMatch;
+
+	/* Syntaxes */
+	Syntax		*si_syn_directoryString;
+	Syntax		*si_syn_distinguishedName;
+	Syntax		*si_syn_integer;
+	Syntax		*si_syn_octetString;
+
+	/* Schema Syntaxes */
+	Syntax		*si_syn_attributeTypeDesc;
+	Syntax		*si_syn_ditContentRuleDesc;
+	Syntax		*si_syn_ditStructureRuleDesc;
+	Syntax		*si_syn_ldapSyntaxDesc;
+	Syntax		*si_syn_matchingRuleDesc;
+	Syntax		*si_syn_matchingRuleUseDesc;
+	Syntax		*si_syn_nameFormDesc;
+	Syntax		*si_syn_objectClassDesc;
+};
+
+struct AttributeAssertion {
+	AttributeDescription	*aa_desc;
+	struct berval		aa_value;
+#ifdef LDAP_COMP_MATCH
+	ComponentFilter		*aa_cf;		/* for attribute aliasing */
+#endif
+};
+#ifdef LDAP_COMP_MATCH
+#define ATTRIBUTEASSERTION_INIT { NULL, BER_BVNULL, NULL }
+#else
+#define ATTRIBUTEASSERTION_INIT { NULL, BER_BVNULL }
+#endif
+
+struct SubstringsAssertion {
+	AttributeDescription	*sa_desc;
+	struct berval		sa_initial;
+	struct berval		*sa_any;
+	struct berval		sa_final;
+};
+
+struct MatchingRuleAssertion {
+	AttributeDescription	*ma_desc;	/* optional */
+	struct berval		ma_value;	/* required */
+	MatchingRule		*ma_rule;	/* optional */
+	struct berval		ma_rule_text;	/* optional */
+	int			ma_dnattrs;	/* boolean */
+#ifdef LDAP_COMP_MATCH
+	ComponentFilter		*ma_cf;	/* component filter */
+#endif
+};
+
+/*
+ * represents a search filter
+ */
+struct Filter {
+	ber_tag_t	f_choice;	/* values taken from ldap.h, plus: */
+#define SLAPD_FILTER_COMPUTED		0
+#define SLAPD_FILTER_MASK			0x7fff
+#define SLAPD_FILTER_UNDEFINED		0x8000
+
+	union f_un_u {
+		/* precomputed result */
+		ber_int_t		f_un_result;
+
+		/* present */
+		AttributeDescription	*f_un_desc;
+
+		/* simple value assertion */
+		AttributeAssertion	*f_un_ava;
+
+		/* substring assertion */
+		SubstringsAssertion	*f_un_ssa;
+
+		/* matching rule assertion */
+		MatchingRuleAssertion	*f_un_mra;
+
+#define f_desc			f_un.f_un_desc
+#define f_ava			f_un.f_un_ava
+#define f_av_desc		f_un.f_un_ava->aa_desc
+#define f_av_value		f_un.f_un_ava->aa_value
+#define f_sub			f_un.f_un_ssa
+#define f_sub_desc		f_un.f_un_ssa->sa_desc
+#define f_sub_initial		f_un.f_un_ssa->sa_initial
+#define f_sub_any		f_un.f_un_ssa->sa_any
+#define f_sub_final		f_un.f_un_ssa->sa_final
+#define f_mra			f_un.f_un_mra
+#define f_mr_rule		f_un.f_un_mra->ma_rule
+#define f_mr_rule_text		f_un.f_un_mra->ma_rule_text
+#define f_mr_desc		f_un.f_un_mra->ma_desc
+#define f_mr_value		f_un.f_un_mra->ma_value
+#define	f_mr_dnattrs		f_un.f_un_mra->ma_dnattrs
+
+		/* and, or, not */
+		Filter			*f_un_complex;
+	} f_un;
+
+#define f_result	f_un.f_un_result
+#define f_and		f_un.f_un_complex
+#define f_or		f_un.f_un_complex
+#define f_not		f_un.f_un_complex
+#define f_list		f_un.f_un_complex
+
+	Filter		*f_next;
+};
+
+/* compare routines can return undefined */
+#define SLAPD_COMPARE_UNDEFINED	((ber_int_t) -1)
+
+struct ValuesReturnFilter {
+	ber_tag_t	vrf_choice;
+
+	union vrf_un_u {
+		/* precomputed result */
+		ber_int_t vrf_un_result;
+
+		/* DN */
+		char *vrf_un_dn;
+
+		/* present */
+		AttributeDescription *vrf_un_desc;
+
+		/* simple value assertion */
+		AttributeAssertion *vrf_un_ava;
+
+		/* substring assertion */
+		SubstringsAssertion *vrf_un_ssa;
+
+		/* matching rule assertion */
+		MatchingRuleAssertion *vrf_un_mra;
+
+#define vrf_result		vrf_un.vrf_un_result
+#define vrf_dn			vrf_un.vrf_un_dn
+#define vrf_desc		vrf_un.vrf_un_desc
+#define vrf_ava			vrf_un.vrf_un_ava
+#define vrf_av_desc		vrf_un.vrf_un_ava->aa_desc
+#define vrf_av_value	vrf_un.vrf_un_ava->aa_value
+#define vrf_ssa			vrf_un.vrf_un_ssa
+#define vrf_sub			vrf_un.vrf_un_ssa
+#define vrf_sub_desc	vrf_un.vrf_un_ssa->sa_desc
+#define vrf_sub_initial	vrf_un.vrf_un_ssa->sa_initial
+#define vrf_sub_any		vrf_un.vrf_un_ssa->sa_any
+#define vrf_sub_final	vrf_un.vrf_un_ssa->sa_final
+#define vrf_mra			vrf_un.vrf_un_mra
+#define vrf_mr_rule		vrf_un.vrf_un_mra->ma_rule
+#define vrf_mr_rule_text	vrf_un.vrf_un_mra->ma_rule_text
+#define vrf_mr_desc		vrf_un.vrf_un_mra->ma_desc
+#define vrf_mr_value		vrf_un.vrf_un_mra->ma_value
+#define	vrf_mr_dnattrs	vrf_un.vrf_un_mra->ma_dnattrs
+
+
+	} vrf_un;
+
+	ValuesReturnFilter	*vrf_next;
+};
+
+/*
+ * represents an attribute (description + values)
+ * desc, vals, nvals, numvals fields must align with Modification
+ */
+struct Attribute {
+	AttributeDescription	*a_desc;
+	BerVarray		a_vals;		/* preserved values */
+	BerVarray		a_nvals;	/* normalized values */
+	unsigned		a_numvals;	/* number of vals */
+	unsigned		a_flags;
+#define SLAP_ATTR_IXADD			0x1U
+#define SLAP_ATTR_IXDEL			0x2U
+#define SLAP_ATTR_DONT_FREE_DATA	0x4U
+#define SLAP_ATTR_DONT_FREE_VALS	0x8U
+#define	SLAP_ATTR_SORTED_VALS		0x10U	/* values are sorted */
+#define	SLAP_ATTR_BIG_MULTI		0x20U	/* for backends */
+
+/* These flags persist across an attr_dup() */
+#define	SLAP_ATTR_PERSISTENT_FLAGS \
+	(SLAP_ATTR_SORTED_VALS|SLAP_ATTR_BIG_MULTI)
+
+	Attribute		*a_next;
+#ifdef LDAP_COMP_MATCH
+	ComponentData		*a_comp_data;	/* component values */
+#endif
+};
+
+
+/*
+ * the id used in the indexes to refer to an entry
+ */
+typedef unsigned long	ID;
+#define NOID	((ID)~0)
+
+typedef struct EntryHeader {
+	struct berval bv;
+	char *data;
+	int nattrs;
+	int nvals;
+} EntryHeader;
+
+/*
+ * represents an entry in core
+ */
+struct Entry {
+	/*
+	 * The ID field should only be changed before entry is
+	 * inserted into a cache.  The ID value is backend
+	 * specific.
+	 */
+	ID		e_id;
+
+	struct berval e_name;	/* name (DN) of this entry */
+	struct berval e_nname;	/* normalized name (DN) of this entry */
+
+	/* for migration purposes */
+#define e_dn e_name.bv_val
+#define e_ndn e_nname.bv_val
+
+	Attribute	*e_attrs;	/* list of attributes + values */
+
+	slap_mask_t	e_ocflags;
+
+	struct berval	e_bv;		/* For entry_encode/entry_decode */
+
+	/* for use by the backend for any purpose */
+	void*	e_private;
+};
+
+/*
+ * A list of LDAPMods
+ * desc, values, nvalues, numvals must align with Attribute
+ */
+struct Modification {
+	AttributeDescription *sm_desc;
+	BerVarray sm_values;
+	BerVarray sm_nvalues;
+	unsigned sm_numvals;
+	short sm_op;
+	short sm_flags;
+/* Set for internal mods, will bypass ACL checks. Only needed when
+ * running as non-root user, for user modifiable attributes.
+ */
+#define	SLAP_MOD_INTERNAL	0x01
+#define	SLAP_MOD_MANAGING	0x02
+	struct berval sm_type;
+};
+
+struct Modifications {
+	Modification	sml_mod;
+#define sml_op		sml_mod.sm_op
+#define sml_flags	sml_mod.sm_flags
+#define sml_desc	sml_mod.sm_desc
+#define	sml_type	sml_mod.sm_type
+#define sml_values	sml_mod.sm_values
+#define sml_nvalues	sml_mod.sm_nvalues
+#define sml_numvals	sml_mod.sm_numvals
+	Modifications	*sml_next;
+};
+
+/*
+ * represents an access control list
+ */
+typedef enum slap_access_t {
+	ACL_INVALID_ACCESS = -1,
+	ACL_NONE = 0,
+	ACL_DISCLOSE,
+	ACL_AUTH,
+	ACL_COMPARE,
+	ACL_SEARCH,
+	ACL_READ,
+	ACL_WRITE_,
+	ACL_MANAGE,
+
+	/* always leave at end of levels but not greater than ACL_LEVEL_MASK */
+	ACL_LAST,
+
+	/* ACL level mask and modifiers */
+	ACL_LEVEL_MASK = 0x000f,
+	ACL_QUALIFIER1 = 0x0100,
+	ACL_QUALIFIER2 = 0x0200,
+	ACL_QUALIFIER3 = 0x0400,
+	ACL_QUALIFIER4 = 0x0800,
+	ACL_QUALIFIER_MASK = 0x0f00,
+
+	/* write granularity */
+	ACL_WADD = ACL_WRITE_|ACL_QUALIFIER1,
+	ACL_WDEL = ACL_WRITE_|ACL_QUALIFIER2,
+
+	ACL_WRITE = ACL_WADD|ACL_WDEL
+} slap_access_t;
+
+typedef enum slap_control_e {
+	ACL_INVALID_CONTROL	= 0,
+	ACL_STOP,
+	ACL_CONTINUE,
+	ACL_BREAK
+} slap_control_t;
+
+typedef enum slap_style_e {
+	ACL_STYLE_REGEX = 0,
+	ACL_STYLE_EXPAND,
+	ACL_STYLE_BASE,
+	ACL_STYLE_ONE,
+	ACL_STYLE_SUBTREE,
+	ACL_STYLE_CHILDREN,
+	ACL_STYLE_LEVEL,
+	ACL_STYLE_ATTROF,
+	ACL_STYLE_ANONYMOUS,
+	ACL_STYLE_USERS,
+	ACL_STYLE_SELF,
+	ACL_STYLE_IP,
+	ACL_STYLE_IPV6,
+	ACL_STYLE_PATH,
+
+	ACL_STYLE_NONE
+} slap_style_t;
+
+typedef struct AuthorizationInformation {
+	ber_tag_t	sai_method;			/* LDAP_AUTH_* from <ldap.h> */
+	struct berval	sai_mech;		/* SASL Mechanism */
+	struct berval	sai_dn;			/* DN for reporting purposes */
+	struct berval	sai_ndn;		/* Normalized DN */
+
+	/* Security Strength Factors */
+	slap_ssf_t	sai_ssf;			/* Overall SSF */
+	slap_ssf_t	sai_transport_ssf;	/* Transport SSF */
+	slap_ssf_t	sai_tls_ssf;		/* TLS SSF */
+	slap_ssf_t	sai_sasl_ssf;		/* SASL SSF */
+} AuthorizationInformation;
+
+#ifdef SLAP_DYNACL
+
+/*
+ * "dynamic" ACL infrastructure (for ACIs and more)
+ */
+typedef int (slap_dynacl_parse) LDAP_P(( const char *fname, int lineno,
+	const char *opts, slap_style_t, const char *, void **privp ));
+typedef int (slap_dynacl_unparse) LDAP_P(( void *priv, struct berval *bv ));
+typedef int (slap_dynacl_mask) LDAP_P((
+		void			*priv,
+		Operation		*op,
+		Entry			*e,
+		AttributeDescription	*desc,
+		struct berval		*val,
+		int			nmatch,
+		regmatch_t		*matches,
+		slap_access_t		*grant,
+		slap_access_t		*deny ));
+typedef int (slap_dynacl_destroy) LDAP_P(( void *priv ));
+
+typedef struct slap_dynacl_t {
+	char			*da_name;
+	slap_dynacl_parse	*da_parse;
+	slap_dynacl_unparse	*da_unparse;
+	slap_dynacl_mask	*da_mask;
+	slap_dynacl_destroy	*da_destroy;
+	
+	void			*da_private;
+	struct slap_dynacl_t	*da_next;
+} slap_dynacl_t;
+#endif /* SLAP_DYNACL */
+
+/* the DN portion of the "by" part */
+typedef struct slap_dn_access {
+	/* DN pattern */
+	AuthorizationInformation	a_dnauthz;
+#define	a_pat			a_dnauthz.sai_dn
+
+	slap_style_t		a_style;
+	int			a_level;
+	int			a_self_level;
+	AttributeDescription	*a_at;
+	int			a_self;
+	int 			a_expand;
+} slap_dn_access;
+
+/* the "by" part */
+typedef struct Access {
+	slap_control_t a_type;
+
+/* strip qualifiers */
+#define ACL_LEVEL(p)			((p) & ACL_LEVEL_MASK)
+#define ACL_QUALIFIERS(p)		((p) & ~ACL_LEVEL_MASK)
+
+#define ACL_ACCESS2PRIV(access)		((0x01U << ACL_LEVEL((access))) | ACL_QUALIFIERS((access)))
+
+#define ACL_PRIV_NONE			ACL_ACCESS2PRIV( ACL_NONE )
+#define ACL_PRIV_DISCLOSE		ACL_ACCESS2PRIV( ACL_DISCLOSE )
+#define ACL_PRIV_AUTH			ACL_ACCESS2PRIV( ACL_AUTH )
+#define ACL_PRIV_COMPARE		ACL_ACCESS2PRIV( ACL_COMPARE )
+#define ACL_PRIV_SEARCH			ACL_ACCESS2PRIV( ACL_SEARCH )
+#define ACL_PRIV_READ			ACL_ACCESS2PRIV( ACL_READ )
+#define ACL_PRIV_WADD			ACL_ACCESS2PRIV( ACL_WADD )
+#define ACL_PRIV_WDEL			ACL_ACCESS2PRIV( ACL_WDEL )
+#define ACL_PRIV_WRITE			( ACL_PRIV_WADD | ACL_PRIV_WDEL )
+#define ACL_PRIV_MANAGE			ACL_ACCESS2PRIV( ACL_MANAGE )
+
+/* NOTE: always use the highest level; current: 0x00ffUL */
+#define ACL_PRIV_MASK			((ACL_ACCESS2PRIV(ACL_LAST) - 1) | ACL_QUALIFIER_MASK)
+
+/* priv flags */
+#define ACL_PRIV_LEVEL			0x1000UL
+#define ACL_PRIV_ADDITIVE		0x2000UL
+#define ACL_PRIV_SUBSTRACTIVE		0x4000UL
+
+/* invalid privs */
+#define ACL_PRIV_INVALID		0x0UL
+
+#define ACL_PRIV_ISSET(m,p)		(((m) & (p)) == (p))
+#define ACL_PRIV_ASSIGN(m,p)		do { (m)  =  (p); } while(0)
+#define ACL_PRIV_SET(m,p)		do { (m) |=  (p); } while(0)
+#define ACL_PRIV_CLR(m,p)		do { (m) &= ~(p); } while(0)
+
+#define ACL_INIT(m)			ACL_PRIV_ASSIGN((m), ACL_PRIV_NONE)
+#define ACL_INVALIDATE(m)		ACL_PRIV_ASSIGN((m), ACL_PRIV_INVALID)
+
+#define ACL_GRANT(m,a)			ACL_PRIV_ISSET((m),ACL_ACCESS2PRIV(a))
+
+#define ACL_IS_INVALID(m)		((m) == ACL_PRIV_INVALID)
+
+#define ACL_IS_LEVEL(m)			ACL_PRIV_ISSET((m),ACL_PRIV_LEVEL)
+#define ACL_IS_ADDITIVE(m)		ACL_PRIV_ISSET((m),ACL_PRIV_ADDITIVE)
+#define ACL_IS_SUBTRACTIVE(m)		ACL_PRIV_ISSET((m),ACL_PRIV_SUBSTRACTIVE)
+
+#define ACL_LVL_NONE			(ACL_PRIV_NONE|ACL_PRIV_LEVEL)
+#define ACL_LVL_DISCLOSE		(ACL_PRIV_DISCLOSE|ACL_LVL_NONE)
+#define ACL_LVL_AUTH			(ACL_PRIV_AUTH|ACL_LVL_DISCLOSE)
+#define ACL_LVL_COMPARE			(ACL_PRIV_COMPARE|ACL_LVL_AUTH)
+#define ACL_LVL_SEARCH			(ACL_PRIV_SEARCH|ACL_LVL_COMPARE)
+#define ACL_LVL_READ			(ACL_PRIV_READ|ACL_LVL_SEARCH)
+#define ACL_LVL_WADD			(ACL_PRIV_WADD|ACL_LVL_READ)
+#define ACL_LVL_WDEL			(ACL_PRIV_WDEL|ACL_LVL_READ)
+#define ACL_LVL_WRITE			(ACL_PRIV_WRITE|ACL_LVL_READ)
+#define ACL_LVL_MANAGE			(ACL_PRIV_MANAGE|ACL_LVL_WRITE)
+
+#define ACL_LVL(m,l)			(((m)&ACL_PRIV_MASK) == ((l)&ACL_PRIV_MASK))
+#define ACL_LVL_IS_NONE(m)		ACL_LVL((m),ACL_LVL_NONE)
+#define ACL_LVL_IS_DISCLOSE(m)		ACL_LVL((m),ACL_LVL_DISCLOSE)
+#define ACL_LVL_IS_AUTH(m)		ACL_LVL((m),ACL_LVL_AUTH)
+#define ACL_LVL_IS_COMPARE(m)		ACL_LVL((m),ACL_LVL_COMPARE)
+#define ACL_LVL_IS_SEARCH(m)		ACL_LVL((m),ACL_LVL_SEARCH)
+#define ACL_LVL_IS_READ(m)		ACL_LVL((m),ACL_LVL_READ)
+#define ACL_LVL_IS_WADD(m)		ACL_LVL((m),ACL_LVL_WADD)
+#define ACL_LVL_IS_WDEL(m)		ACL_LVL((m),ACL_LVL_WDEL)
+#define ACL_LVL_IS_WRITE(m)		ACL_LVL((m),ACL_LVL_WRITE)
+#define ACL_LVL_IS_MANAGE(m)		ACL_LVL((m),ACL_LVL_MANAGE)
+
+#define ACL_LVL_ASSIGN_NONE(m)		ACL_PRIV_ASSIGN((m),ACL_LVL_NONE)
+#define ACL_LVL_ASSIGN_DISCLOSE(m)	ACL_PRIV_ASSIGN((m),ACL_LVL_DISCLOSE)
+#define ACL_LVL_ASSIGN_AUTH(m)		ACL_PRIV_ASSIGN((m),ACL_LVL_AUTH)
+#define ACL_LVL_ASSIGN_COMPARE(m)	ACL_PRIV_ASSIGN((m),ACL_LVL_COMPARE)
+#define ACL_LVL_ASSIGN_SEARCH(m)	ACL_PRIV_ASSIGN((m),ACL_LVL_SEARCH)
+#define ACL_LVL_ASSIGN_READ(m)		ACL_PRIV_ASSIGN((m),ACL_LVL_READ)
+#define ACL_LVL_ASSIGN_WADD(m)		ACL_PRIV_ASSIGN((m),ACL_LVL_WADD)
+#define ACL_LVL_ASSIGN_WDEL(m)		ACL_PRIV_ASSIGN((m),ACL_LVL_WDEL)
+#define ACL_LVL_ASSIGN_WRITE(m)		ACL_PRIV_ASSIGN((m),ACL_LVL_WRITE)
+#define ACL_LVL_ASSIGN_MANAGE(m)	ACL_PRIV_ASSIGN((m),ACL_LVL_MANAGE)
+
+	slap_mask_t	a_access_mask;
+
+	/* DN pattern */
+	slap_dn_access		a_dn;
+#define a_dn_pat		a_dn.a_dnauthz.sai_dn
+#define	a_dn_at			a_dn.a_at
+#define	a_dn_self		a_dn.a_self
+
+	/* real DN pattern */
+	slap_dn_access		a_realdn;
+#define a_realdn_pat		a_realdn.a_dnauthz.sai_dn
+#define	a_realdn_at		a_realdn.a_at
+#define	a_realdn_self		a_realdn.a_self
+
+	/* used for ssf stuff
+	 * NOTE: the ssf stuff in a_realdn is ignored */
+#define	a_authz			a_dn.a_dnauthz
+
+	/* connection related stuff */
+	slap_style_t a_peername_style;
+	struct berval	a_peername_pat;
+#ifdef LDAP_PF_INET6
+	union {
+		struct in6_addr	ax6;
+		unsigned long	ax;
+	}	ax_peername_addr,
+		ax_peername_mask;
+#define	a_peername_addr6	ax_peername_addr.ax6
+#define	a_peername_addr		ax_peername_addr.ax
+#define	a_peername_mask6	ax_peername_mask.ax6
+#define	a_peername_mask		ax_peername_mask.ax
+/* apparently, only s6_addr is portable;
+ * define a portable address mask comparison */
+#define	slap_addr6_mask(val, msk, asr) ( \
+	(((val)->s6_addr[0] & (msk)->s6_addr[0]) == (asr)->s6_addr[0]) \
+	&& (((val)->s6_addr[1] & (msk)->s6_addr[1]) == (asr)->s6_addr[1]) \
+	&& (((val)->s6_addr[2] & (msk)->s6_addr[2]) == (asr)->s6_addr[2]) \
+	&& (((val)->s6_addr[3] & (msk)->s6_addr[3]) == (asr)->s6_addr[3]) \
+	&& (((val)->s6_addr[4] & (msk)->s6_addr[4]) == (asr)->s6_addr[4]) \
+	&& (((val)->s6_addr[5] & (msk)->s6_addr[5]) == (asr)->s6_addr[5]) \
+	&& (((val)->s6_addr[6] & (msk)->s6_addr[6]) == (asr)->s6_addr[6]) \
+	&& (((val)->s6_addr[7] & (msk)->s6_addr[7]) == (asr)->s6_addr[7]) \
+	&& (((val)->s6_addr[8] & (msk)->s6_addr[8]) == (asr)->s6_addr[8]) \
+	&& (((val)->s6_addr[9] & (msk)->s6_addr[9]) == (asr)->s6_addr[9]) \
+	&& (((val)->s6_addr[10] & (msk)->s6_addr[10]) == (asr)->s6_addr[10]) \
+	&& (((val)->s6_addr[11] & (msk)->s6_addr[11]) == (asr)->s6_addr[11]) \
+	&& (((val)->s6_addr[12] & (msk)->s6_addr[12]) == (asr)->s6_addr[12]) \
+	&& (((val)->s6_addr[13] & (msk)->s6_addr[13]) == (asr)->s6_addr[13]) \
+	&& (((val)->s6_addr[14] & (msk)->s6_addr[14]) == (asr)->s6_addr[14]) \
+	&& (((val)->s6_addr[15] & (msk)->s6_addr[15]) == (asr)->s6_addr[15]) \
+	)
+#else /* ! LDAP_PF_INET6 */
+	unsigned long	a_peername_addr,
+			a_peername_mask;
+#endif /* ! LDAP_PF_INET6 */
+	int		a_peername_port;
+
+	slap_style_t a_sockname_style;
+	struct berval	a_sockname_pat;
+
+	slap_style_t a_domain_style;
+	struct berval	a_domain_pat;
+	int		a_domain_expand;
+
+	slap_style_t a_sockurl_style;
+	struct berval	a_sockurl_pat;
+	slap_style_t a_set_style;
+	struct berval	a_set_pat;
+
+#ifdef SLAP_DYNACL
+	slap_dynacl_t		*a_dynacl;
+#endif /* SLAP_DYNACL */
+
+	/* ACL Groups */
+	slap_style_t a_group_style;
+	struct berval	a_group_pat;
+	ObjectClass		*a_group_oc;
+	AttributeDescription	*a_group_at;
+
+	struct Access		*a_next;
+} Access;
+
+/* the "to" part */
+typedef struct AccessControl {
+	/* "to" part: the entries this acl applies to */
+	Filter		*acl_filter;
+	slap_style_t acl_dn_style;
+	regex_t		acl_dn_re;
+	struct berval	acl_dn_pat;
+	AttributeName	*acl_attrs;
+	MatchingRule	*acl_attrval_mr;
+	slap_style_t	acl_attrval_style;
+	regex_t		acl_attrval_re;
+	struct berval	acl_attrval;
+
+	/* "by" part: list of who has what access to the entries */
+	Access	*acl_access;
+
+	struct AccessControl	*acl_next;
+} AccessControl;
+
+typedef struct AccessControlState {
+	/* Access state */
+
+	/* The stored state is valid when requesting as_access access
+	 * to the as_desc attributes.	 */
+	AttributeDescription *as_desc;
+	slap_access_t	as_access;
+
+	/* Value dependent acl where processing can restart */
+	AccessControl  *as_vd_acl;
+	int as_vd_acl_present;
+	int as_vd_acl_count;
+	slap_mask_t		as_vd_mask;
+
+	/* The cached result after evaluating a value independent attr.
+	 * Only valid when != -1 and as_vd_acl == NULL */
+	int as_result;
+
+	/* True if started to process frontend ACLs */
+	int as_fe_done;
+} AccessControlState;
+#define ACL_STATE_INIT { NULL, ACL_NONE, NULL, 0, 0, ACL_PRIV_NONE, -1, 0 }
+
+typedef struct AclRegexMatches {        
+	int dn_count;
+        regmatch_t dn_data[MAXREMATCHES];
+	int val_count;
+        regmatch_t val_data[MAXREMATCHES];
+} AclRegexMatches;
+
+/*
+ * Backend-info
+ * represents a backend 
+ */
+
+typedef LDAP_STAILQ_HEAD(BeI, BackendInfo) slap_bi_head;
+typedef LDAP_STAILQ_HEAD(BeDB, BackendDB) slap_be_head;
+
+LDAP_SLAPD_V (int) nBackendInfo;
+LDAP_SLAPD_V (int) nBackendDB;
+LDAP_SLAPD_V (slap_bi_head) backendInfo;
+LDAP_SLAPD_V (slap_be_head) backendDB;
+LDAP_SLAPD_V (BackendDB *) frontendDB;
+
+LDAP_SLAPD_V (int) slapMode;	
+#define SLAP_UNDEFINED_MODE	0x0000
+#define SLAP_SERVER_MODE	0x0001
+#define SLAP_TOOL_MODE		0x0002
+#define SLAP_MODE			0x0003
+
+#define SLAP_TRUNCATE_MODE	0x0100
+#define	SLAP_TOOL_READMAIN	0x0200
+#define	SLAP_TOOL_READONLY	0x0400
+#define	SLAP_TOOL_QUICK		0x0800
+#define SLAP_TOOL_NO_SCHEMA_CHECK	0x1000
+#define SLAP_TOOL_VALUE_CHECK	0x2000
+
+#define SLAP_SERVER_RUNNING	0x8000
+
+#define SB_TLS_DEFAULT		(-1)
+#define SB_TLS_OFF		0
+#define SB_TLS_ON		1
+#define SB_TLS_CRITICAL		2
+
+enum slaptool {
+	SLAPADD=1,	/* LDIF -> database tool */
+	SLAPCAT,	/* database -> LDIF tool */
+	SLAPDN,		/* DN check w/ syntax tool */
+	SLAPINDEX,	/* database index tool */
+	SLAPMODIFY,	/* database modify tool */
+	SLAPPASSWD,	/* password generation tool */
+	SLAPSCHEMA,	/* schema checking tool */
+	SLAPTEST,	/* slapd.conf test tool */
+	SLAPAUTH,	/* test authz-regexp and authc/authz stuff */
+	SLAPACL,	/* test acl */
+	SLAPLAST
+};
+
+LDAP_SLAPD_V(enum slaptool) slapTool;
+
+typedef struct slap_keepalive {
+	int sk_idle;
+	int sk_probes;
+	int sk_interval;
+} slap_keepalive;
+
+typedef struct slap_bindconf {
+	struct berval sb_uri;
+	int sb_version;
+	int sb_tls;
+	int sb_method;
+	int sb_timeout_api;
+	int sb_timeout_net;
+	struct berval sb_binddn;
+	struct berval sb_cred;
+	struct berval sb_saslmech;
+	char *sb_secprops;
+	struct berval sb_realm;
+	struct berval sb_authcId;
+	struct berval sb_authzId;
+	slap_keepalive sb_keepalive;
+	unsigned int sb_tcp_user_timeout;
+#ifdef HAVE_TLS
+	void *sb_tls_ctx;
+	char *sb_tls_cert;
+	char *sb_tls_key;
+	char *sb_tls_cacert;
+	char *sb_tls_cacertdir;
+	char *sb_tls_reqcert;
+	char *sb_tls_reqsan;
+	char *sb_tls_cipher_suite;
+	char *sb_tls_protocol_min;
+	char *sb_tls_ecname;
+#ifdef HAVE_OPENSSL
+	char *sb_tls_crlcheck;
+#endif
+	int sb_tls_int_reqcert;
+	int sb_tls_int_reqsan;
+	int sb_tls_do_init;
+#endif
+} slap_bindconf;
+
+typedef struct slap_verbmasks {
+	struct berval word;
+	const slap_mask_t mask;
+} slap_verbmasks;
+
+typedef struct slap_cf_aux_table {
+	struct berval key;
+	int off;
+	char type;
+	char quote;
+	void *aux;
+} slap_cf_aux_table;
+
+typedef int 
+slap_cf_aux_table_parse_x LDAP_P((
+	struct berval *val,
+	void *bc,
+	slap_cf_aux_table *tab0,
+	const char *tabmsg,
+	int unparse ));
+
+#define SLAP_LIMIT_TIME	1
+#define SLAP_LIMIT_SIZE	2
+
+struct slap_limits_set {
+	/* time limits */
+	int	lms_t_soft;
+	int	lms_t_hard;
+
+	/* size limits */
+	int	lms_s_soft;
+	int	lms_s_hard;
+	int	lms_s_unchecked;
+	int	lms_s_pr;
+	int	lms_s_pr_hide;
+	int	lms_s_pr_total;
+};
+
+/* Note: this is different from LDAP_NO_LIMIT (0); slapd internal use only */
+#define SLAP_NO_LIMIT			-1
+#define SLAP_MAX_LIMIT			2147483647
+
+struct slap_limits {
+	unsigned		lm_flags;	/* type of pattern */
+	/* Values must match lmpats[] in limits.c */
+#define SLAP_LIMITS_UNDEFINED		0x0000U
+#define SLAP_LIMITS_EXACT		0x0001U
+#define SLAP_LIMITS_BASE		SLAP_LIMITS_EXACT
+#define SLAP_LIMITS_ONE			0x0002U
+#define SLAP_LIMITS_SUBTREE		0x0003U
+#define SLAP_LIMITS_CHILDREN		0x0004U
+#define SLAP_LIMITS_REGEX		0x0005U
+#define SLAP_LIMITS_ANONYMOUS		0x0006U
+#define SLAP_LIMITS_USERS		0x0007U
+#define SLAP_LIMITS_ANY			0x0008U
+#define SLAP_LIMITS_MASK		0x000FU
+
+#define SLAP_LIMITS_TYPE_SELF		0x0000U
+#define SLAP_LIMITS_TYPE_DN		SLAP_LIMITS_TYPE_SELF
+#define SLAP_LIMITS_TYPE_GROUP		0x0010U
+#define SLAP_LIMITS_TYPE_THIS		0x0020U
+#define SLAP_LIMITS_TYPE_MASK		0x00F0U
+
+	regex_t			lm_regex;	/* regex data for REGEX */
+
+	/*
+	 * normalized DN for EXACT, BASE, ONE, SUBTREE, CHILDREN;
+	 * pattern for REGEX; NULL for ANONYMOUS, USERS
+	 */
+	struct berval		lm_pat;
+
+	/* if lm_flags & SLAP_LIMITS_TYPE_MASK == SLAP_LIMITS_GROUP,
+	 * lm_group_oc is objectClass and lm_group_at is attributeType
+	 * of member in oc for match; then lm_flags & SLAP_LIMITS_MASK
+	 * can only be SLAP_LIMITS_EXACT */
+	ObjectClass		*lm_group_oc;
+	AttributeDescription	*lm_group_ad;
+
+	struct slap_limits_set	lm_limits;
+};
+
+/* temporary aliases */
+typedef BackendDB Backend;
+#define nbackends nBackendDB
+#define backends backendDB
+
+/*
+ * syncinfo structure for syncrepl
+ */
+
+struct syncinfo_s;
+
+#define SLAP_SYNC_RID_MAX	999
+#define SLAP_SYNC_SID_MAX	4095	/* based on liblutil/csn.c field width */
+
+/* fake conn connid constructed as rid; real connids start
+ * at SLAPD_SYNC_CONN_OFFSET */
+#define SLAPD_SYNC_SYNCCONN_OFFSET (SLAP_SYNC_RID_MAX + 1)
+#define SLAPD_SYNC_IS_SYNCCONN(connid) ((connid) < SLAPD_SYNC_SYNCCONN_OFFSET)
+#define SLAPD_SYNC_RID2SYNCCONN(rid) (rid)
+
+#define SLAP_SYNCUUID_SET_SIZE 256
+
+struct sync_cookie {
+	BerVarray ctxcsn;
+	int *sids;
+	int numcsns;
+	int rid;
+	struct berval octet_str;
+	struct berval delcsn;
+	int sid;
+	LDAP_STAILQ_ENTRY(sync_cookie) sc_next;
+};
+
+LDAP_STAILQ_HEAD( slap_sync_cookie_s, sync_cookie );
+
+/* Defs for pending_csn_list */
+LDAP_TAILQ_HEAD( be_pclh, slap_csn_entry );
+
+typedef struct be_pcsn {
+	struct be_pclh			be_pcsn_list;
+	ldap_pvt_thread_mutex_t	be_pcsn_mutex;
+} be_pcsn;
+
+#ifndef SLAP_MAX_CIDS
+#define	SLAP_MAX_CIDS	32	/* Maximum number of supported controls */
+#endif
+
+struct ConfigOCs;	/* slap-config.h */
+
+struct BackendDB {
+	BackendInfo	*bd_info;	/* pointer to shared backend info */
+	BackendDB	*bd_self;	/* pointer to this struct */
+
+	/* fields in this structure (and routines acting on this structure)
+	   should be renamed from be_ to bd_ */
+
+	/* BackendInfo accessors */
+#define		be_config	bd_info->bi_db_config
+#define		be_type		bd_info->bi_type
+
+#define		be_bind		bd_info->bi_op_bind
+#define		be_unbind	bd_info->bi_op_unbind
+#define		be_add		bd_info->bi_op_add
+#define		be_compare	bd_info->bi_op_compare
+#define		be_delete	bd_info->bi_op_delete
+#define		be_modify	bd_info->bi_op_modify
+#define		be_modrdn	bd_info->bi_op_modrdn
+#define		be_search	bd_info->bi_op_search
+#define		be_abandon	bd_info->bi_op_abandon
+
+#define		be_extended	bd_info->bi_extended
+#define		be_cancel	bd_info->bi_op_cancel
+
+#define		be_chk_referrals	bd_info->bi_chk_referrals
+#define		be_chk_controls		bd_info->bi_chk_controls
+#define		be_fetch	bd_info->bi_entry_get_rw
+#define		be_release	bd_info->bi_entry_release_rw
+#define		be_group	bd_info->bi_acl_group
+#define		be_attribute	bd_info->bi_acl_attribute
+#define		be_operational	bd_info->bi_operational
+
+/*
+ * define to honor hasSubordinates operational attribute in search filters
+ */
+#define		be_has_subordinates bd_info->bi_has_subordinates
+
+#define		be_connection_init	bd_info->bi_connection_init
+#define		be_connection_destroy	bd_info->bi_connection_destroy
+
+#ifdef SLAPD_TOOLS
+#define		be_entry_open bd_info->bi_tool_entry_open
+#define		be_entry_close bd_info->bi_tool_entry_close
+#define		be_entry_first bd_info->bi_tool_entry_first
+#define		be_entry_first_x bd_info->bi_tool_entry_first_x
+#define		be_entry_next bd_info->bi_tool_entry_next
+#define		be_entry_reindex bd_info->bi_tool_entry_reindex
+#define		be_entry_get bd_info->bi_tool_entry_get
+#define		be_entry_put bd_info->bi_tool_entry_put
+#define		be_sync bd_info->bi_tool_sync
+#define		be_dn2id_get bd_info->bi_tool_dn2id_get
+#define		be_entry_modify	bd_info->bi_tool_entry_modify
+#define		be_entry_delete	bd_info->bi_tool_entry_delete
+#endif
+
+	/* supported controls */
+	/* note: set to 0 if the database does not support the control;
+	 * be_ctrls[SLAP_MAX_CIDS] is set to 1 if initialized */
+	char		be_ctrls[SLAP_MAX_CIDS + 1];
+
+/* Database flags */
+#define SLAP_DBFLAG_NOLASTMOD		0x0001U
+#define SLAP_DBFLAG_NO_SCHEMA_CHECK	0x0002U
+#define	SLAP_DBFLAG_HIDDEN		0x0004U
+#define	SLAP_DBFLAG_ONE_SUFFIX		0x0008U
+#define	SLAP_DBFLAG_GLUE_INSTANCE	0x0010U	/* a glue backend */
+#define	SLAP_DBFLAG_GLUE_SUBORDINATE	0x0020U	/* child of a glue hierarchy */
+#define	SLAP_DBFLAG_GLUE_LINKED		0x0040U	/* child is connected to parent */
+#define SLAP_DBFLAG_GLUE_ADVERTISE	0x0080U /* advertise in rootDSE */
+#define SLAP_DBFLAG_OVERLAY		0x0100U	/* this db struct is an overlay */
+#define	SLAP_DBFLAG_GLOBAL_OVERLAY	0x0200U	/* this db struct is a global overlay */
+#define SLAP_DBFLAG_DYNAMIC		0x0400U /* this db allows dynamicObjects */
+#define	SLAP_DBFLAG_MONITORING		0x0800U	/* custom monitoring enabled */
+#define SLAP_DBFLAG_SHADOW		0x8000U /* a shadow */
+#define SLAP_DBFLAG_SINGLE_SHADOW	0x4000U	/* a single-provider shadow */
+#define SLAP_DBFLAG_SYNC_SHADOW		0x1000U /* a sync shadow */
+#define SLAP_DBFLAG_SLURP_SHADOW	0x2000U /* a slurp shadow */
+#define SLAP_DBFLAG_SHADOW_MASK		(SLAP_DBFLAG_SHADOW|SLAP_DBFLAG_SINGLE_SHADOW|SLAP_DBFLAG_SYNC_SHADOW|SLAP_DBFLAG_SLURP_SHADOW)
+#define SLAP_DBFLAG_CLEAN		0x10000U /* was cleanly shutdown */
+#define SLAP_DBFLAG_ACL_ADD		0x20000U /* check attr ACLs on adds */
+#define SLAP_DBFLAG_SYNC_SUBENTRY	0x40000U /* use subentry for context */
+#define SLAP_DBFLAG_MULTI_SHADOW	0x80000U /* uses multi-provider */
+#define SLAP_DBFLAG_DISABLED	0x100000U
+#define SLAP_DBFLAG_LASTBIND	0x200000U
+#define SLAP_DBFLAG_OPEN	0x400000U	/* db is currently open */
+	slap_mask_t	be_flags;
+#define SLAP_DBFLAGS(be)			((be)->be_flags)
+#define SLAP_NOLASTMOD(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_NOLASTMOD)
+#define SLAP_LASTMOD(be)			(!SLAP_NOLASTMOD(be))
+#define SLAP_LASTBIND(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_LASTBIND)
+#define SLAP_DBHIDDEN(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_HIDDEN)
+#define SLAP_DBDISABLED(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_DISABLED)
+#define SLAP_DB_ONE_SUFFIX(be)		(SLAP_DBFLAGS(be) & SLAP_DBFLAG_ONE_SUFFIX)
+#define SLAP_ISOVERLAY(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_OVERLAY)
+#define SLAP_ISGLOBALOVERLAY(be)		(SLAP_DBFLAGS(be) & SLAP_DBFLAG_GLOBAL_OVERLAY)
+#define SLAP_DBMONITORING(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_MONITORING)
+#define SLAP_NO_SCHEMA_CHECK(be)	\
+	(SLAP_DBFLAGS(be) & SLAP_DBFLAG_NO_SCHEMA_CHECK)
+#define	SLAP_GLUE_INSTANCE(be)		\
+	(SLAP_DBFLAGS(be) & SLAP_DBFLAG_GLUE_INSTANCE)
+#define	SLAP_GLUE_SUBORDINATE(be)	\
+	(SLAP_DBFLAGS(be) & SLAP_DBFLAG_GLUE_SUBORDINATE)
+#define	SLAP_GLUE_LINKED(be)		\
+	(SLAP_DBFLAGS(be) & SLAP_DBFLAG_GLUE_LINKED)
+#define	SLAP_GLUE_ADVERTISE(be)	\
+	(SLAP_DBFLAGS(be) & SLAP_DBFLAG_GLUE_ADVERTISE)
+#define SLAP_SHADOW(be)				(SLAP_DBFLAGS(be) & SLAP_DBFLAG_SHADOW)
+#define SLAP_SYNC_SHADOW(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_SYNC_SHADOW)
+#define SLAP_SLURP_SHADOW(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_SLURP_SHADOW)
+#define SLAP_SINGLE_SHADOW(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_SINGLE_SHADOW)
+#define SLAP_MULTIPROVIDER(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_MULTI_SHADOW)
+#define SLAP_DBCLEAN(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_CLEAN)
+#define SLAP_DBOPEN(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_OPEN)
+#define SLAP_DBACL_ADD(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_ACL_ADD)
+#define SLAP_SYNC_SUBENTRY(be)			(SLAP_DBFLAGS(be) & SLAP_DBFLAG_SYNC_SUBENTRY)
+
+	slap_mask_t	be_restrictops;		/* restriction operations */
+#define SLAP_RESTRICT_OP_ADD		0x0001U
+#define	SLAP_RESTRICT_OP_BIND		0x0002U
+#define SLAP_RESTRICT_OP_COMPARE	0x0004U
+#define SLAP_RESTRICT_OP_DELETE		0x0008U
+#define	SLAP_RESTRICT_OP_EXTENDED	0x0010U
+#define SLAP_RESTRICT_OP_MODIFY		0x0020U
+#define SLAP_RESTRICT_OP_RENAME		0x0040U
+#define SLAP_RESTRICT_OP_SEARCH		0x0080U
+#define SLAP_RESTRICT_OP_MASK		0x00FFU
+
+#define	SLAP_RESTRICT_READONLY		0x80000000U
+
+#define SLAP_RESTRICT_EXOP_START_TLS		0x0100U
+#define	SLAP_RESTRICT_EXOP_MODIFY_PASSWD	0x0200U
+#define SLAP_RESTRICT_EXOP_WHOAMI		0x0400U
+#define SLAP_RESTRICT_EXOP_CANCEL		0x0800U
+#define SLAP_RESTRICT_EXOP_MASK			0xFF00U
+
+#define SLAP_RESTRICT_OP_READS	\
+	( SLAP_RESTRICT_OP_COMPARE	\
+	| SLAP_RESTRICT_OP_SEARCH )
+#define SLAP_RESTRICT_OP_WRITES	\
+	( SLAP_RESTRICT_OP_ADD    \
+	| SLAP_RESTRICT_OP_DELETE \
+	| SLAP_RESTRICT_OP_MODIFY \
+	| SLAP_RESTRICT_OP_RENAME )
+#define SLAP_RESTRICT_OP_ALL \
+	( SLAP_RESTRICT_OP_READS \
+	| SLAP_RESTRICT_OP_WRITES \
+	| SLAP_RESTRICT_OP_BIND \
+	| SLAP_RESTRICT_OP_EXTENDED )
+
+#define SLAP_ALLOW_BIND_V2		0x0001U	/* LDAPv2 bind */
+#define SLAP_ALLOW_BIND_ANON_CRED	0x0002U /* cred should be empty */
+#define SLAP_ALLOW_BIND_ANON_DN		0x0004U /* dn should be empty */
+
+#define SLAP_ALLOW_UPDATE_ANON		0x0008U /* allow anonymous updates */
+#define SLAP_ALLOW_PROXY_AUTHZ_ANON	0x0010U /* allow anonymous proxyAuthz */
+
+#define SLAP_DISALLOW_BIND_ANON		0x0001U /* no anonymous */
+#define SLAP_DISALLOW_BIND_SIMPLE	0x0002U	/* simple authentication */
+
+#define SLAP_DISALLOW_TLS_2_ANON	0x0010U /* StartTLS -> Anonymous */
+#define SLAP_DISALLOW_TLS_AUTHC		0x0020U	/* TLS while authenticated */
+
+#define SLAP_DISALLOW_PROXY_AUTHZ_N_CRIT	0x0100U
+#define SLAP_DISALLOW_DONTUSECOPY_N_CRIT	0x0200U
+
+#define SLAP_DISALLOW_AUX_WO_CR		0x4000U
+
+	slap_mask_t	be_requires;	/* pre-operation requirements */
+#define SLAP_REQUIRE_BIND		0x0001U	/* bind before op */
+#define SLAP_REQUIRE_LDAP_V3	0x0002U	/* LDAPv3 before op */
+#define SLAP_REQUIRE_AUTHC		0x0004U	/* authentication before op */
+#define SLAP_REQUIRE_SASL		0x0008U	/* SASL before op  */
+#define SLAP_REQUIRE_STRONG		0x0010U	/* strong authentication before op */
+
+	/* Required Security Strength Factor */
+	slap_ssf_set_t be_ssf_set;
+
+	BerVarray	be_suffix;	/* the DN suffixes of data in this backend */
+	BerVarray	be_nsuffix;	/* the normalized DN suffixes in this backend */
+	struct berval be_schemadn;	/* per-backend subschema subentry DN */
+	struct berval be_schemandn;	/* normalized subschema DN */
+	struct berval be_rootdn;	/* the magic "root" name (DN) for this db */
+	struct berval be_rootndn;	/* the magic "root" normalized name (DN) for this db */
+	struct berval be_rootpw;	/* the magic "root" password for this db	*/
+	unsigned int be_max_deref_depth; /* limit for depth of an alias deref  */
+#define be_sizelimit	be_def_limit.lms_s_soft
+#define be_timelimit	be_def_limit.lms_t_soft
+	struct slap_limits_set be_def_limit; /* default limits */
+	struct slap_limits **be_limits; /* regex-based size and time limits */
+	AccessControl *be_acl;	/* access control list for this backend	   */
+	slap_access_t	be_dfltaccess;	/* access given if no acl matches	   */
+	AttributeName	*be_extra_anlist;	/* attributes that need to be added to search requests (ITS#6513) */
+
+	/* Consumer Information */
+	struct berval be_update_ndn;	/* allowed to make changes (in replicas) */
+	BerVarray	be_update_refs;	/* where to refer modifying clients to */
+	be_pcsn	be_pcsn_st;			/* be_pending_csn_list now inside this */
+	be_pcsn	*be_pcsn_p;
+	struct syncinfo_s						*be_syncinfo; /* For syncrepl */
+
+	void    *be_pb;         /* Netscape plugin */
+	struct ConfigOCs *be_cf_ocs;
+
+	void	*be_private;	/* anything the backend database needs 	   */
+	LDAP_STAILQ_ENTRY(BackendDB) be_next;
+};
+
+/* Backend function typedefs */
+typedef int (BI_bi_func) LDAP_P((BackendInfo *bi));
+typedef BI_bi_func BI_init;
+typedef BI_bi_func BI_open;
+typedef BI_bi_func BI_pause;
+typedef BI_bi_func BI_unpause;
+typedef BI_bi_func BI_close;
+typedef BI_bi_func BI_destroy;
+typedef int (BI_config) LDAP_P((BackendInfo *bi,
+	const char *fname, int lineno,
+	int argc, char **argv));
+
+typedef struct config_reply_s ConfigReply; /* slap-config.h */
+typedef int (BI_db_func) LDAP_P((Backend *bd, ConfigReply *cr));
+typedef BI_db_func BI_db_init;
+typedef BI_db_func BI_db_open;
+typedef BI_db_func BI_db_close;
+typedef BI_db_func BI_db_destroy;
+typedef int (BI_db_config) LDAP_P((Backend *bd,
+	const char *fname, int lineno,
+	int argc, char **argv));
+
+typedef struct req_bind_s {
+	int rb_method;
+	struct berval rb_cred;
+	struct berval rb_edn;
+	slap_ssf_t rb_ssf;
+	struct berval rb_mech;
+} req_bind_s;
+
+typedef struct req_search_s {
+	int rs_scope;
+	int rs_deref;
+	int rs_slimit;
+	int rs_tlimit;
+	/* NULL means be_isroot evaluated to TRUE */
+	struct slap_limits_set *rs_limit;
+	int rs_attrsonly;
+	AttributeName *rs_attrs;
+	Filter *rs_filter;
+	struct berval rs_filterstr;
+} req_search_s;
+
+typedef struct req_compare_s {
+	AttributeAssertion *rs_ava;
+} req_compare_s;
+
+typedef struct req_modifications_s {
+	Modifications *rs_modlist;
+	char rs_no_opattrs;		/* don't att modify operational attrs */
+} req_modifications_s;
+
+typedef struct req_modify_s {
+	req_modifications_s rs_mods;	/* NOTE: must be first in req_modify_s & req_modrdn_s */
+	int rs_increment;
+} req_modify_s;
+
+typedef struct req_modrdn_s {
+	req_modifications_s rs_mods;	/* NOTE: must be first in req_modify_s & req_modrdn_s */
+	int rs_deleteoldrdn;
+	struct berval rs_newrdn;
+	struct berval rs_nnewrdn;
+	struct berval *rs_newSup;
+	struct berval *rs_nnewSup;
+} req_modrdn_s;
+
+typedef struct req_add_s {
+	Modifications *rs_modlist;
+	Entry *rs_e;
+} req_add_s;
+
+typedef struct req_abandon_s {
+	ber_int_t rs_msgid;
+} req_abandon_s;
+
+#ifdef SLAP_SCHEMA_EXPOSE
+#define SLAP_EXOP_HIDE 0x0000
+#else
+#define SLAP_EXOP_HIDE 0x8000
+#endif
+#define SLAP_EXOP_WRITES 0x0001		/* Exop does writes */
+
+typedef struct req_extended_s {
+	struct berval rs_reqoid;
+	int rs_flags;
+	struct berval *rs_reqdata;
+} req_extended_s;
+
+typedef struct req_pwdexop_s {
+	struct req_extended_s rs_extended;
+	struct berval rs_old;
+	struct berval rs_new;
+	Modifications *rs_mods;
+	Modifications **rs_modtail;
+} req_pwdexop_s;
+
+typedef enum slap_reply_e {
+	REP_RESULT,
+	REP_SASL,
+	REP_EXTENDED,
+	REP_SEARCH,
+	REP_SEARCHREF,
+	REP_INTERMEDIATE,
+	REP_GLUE_RESULT
+} slap_reply_t;
+
+typedef struct rep_sasl_s {
+	struct berval *r_sasldata;
+} rep_sasl_s;
+
+typedef struct rep_extended_s {
+	const char *r_rspoid;
+	struct berval *r_rspdata;
+} rep_extended_s;
+
+typedef struct rep_search_s {
+	Entry *r_entry;
+	slap_mask_t r_attr_flags;
+#define SLAP_ATTRS_UNDEFINED	(0x00U)
+#define SLAP_OPATTRS_NO			(0x01U)
+#define SLAP_OPATTRS_YES		(0x02U)
+#define SLAP_USERATTRS_NO		(0x10U)
+#define SLAP_USERATTRS_YES		(0x20U)
+#define SLAP_OPATTRS_MASK(f)	((f) & (SLAP_OPATTRS_NO|SLAP_OPATTRS_YES))
+#define SLAP_OPATTRS(f)			(((f) & SLAP_OPATTRS_YES) == SLAP_OPATTRS_YES)
+#define SLAP_USERATTRS_MASK(f)	((f) & (SLAP_USERATTRS_NO|SLAP_USERATTRS_YES))
+#define SLAP_USERATTRS(f)		\
+	(((f) & SLAP_USERATTRS_YES) == SLAP_USERATTRS_YES)
+
+	Attribute *r_operational_attrs;
+	AttributeName *r_attrs;
+	int r_nentries;
+	BerVarray r_v2ref;
+} rep_search_s;
+
+struct SlapReply {
+	slap_reply_t sr_type;
+	ber_tag_t sr_tag;
+	ber_int_t sr_msgid;
+	ber_int_t sr_err;
+	const char *sr_matched;
+	const char *sr_text;
+	BerVarray sr_ref;
+	LDAPControl **sr_ctrls;
+	union sr_u {
+		rep_search_s sru_search;
+		rep_sasl_s sru_sasl;
+		rep_extended_s sru_extended;
+	} sr_un;
+	slap_mask_t sr_flags;
+#define	REP_ENTRY_MODIFIABLE	((slap_mask_t) 0x0001U)
+#define	REP_ENTRY_MUSTBEFREED	((slap_mask_t) 0x0002U)
+#define	REP_ENTRY_MUSTRELEASE	((slap_mask_t) 0x0004U)
+#define	REP_ENTRY_MASK		(REP_ENTRY_MODIFIABLE|REP_ENTRY_MUSTFLUSH)
+#define	REP_ENTRY_MUSTFLUSH	(REP_ENTRY_MUSTBEFREED|REP_ENTRY_MUSTRELEASE)
+
+#define	REP_MATCHED_MUSTBEFREED	((slap_mask_t) 0x0010U)
+#define	REP_MATCHED_MASK	(REP_MATCHED_MUSTBEFREED)
+
+#define REP_REF_MUSTBEFREED	((slap_mask_t) 0x0020U)
+#define REP_REF_MASK		(REP_REF_MUSTBEFREED)
+
+#define REP_CTRLS_MUSTBEFREED	((slap_mask_t) 0x0040U)
+#define REP_CTRLS_MASK		(REP_CTRLS_MUSTBEFREED)
+
+#define	REP_NO_ENTRYDN		((slap_mask_t) 0x1000U)
+#define	REP_NO_SUBSCHEMA	((slap_mask_t) 0x2000U)
+#define	REP_NO_OPERATIONALS	(REP_NO_ENTRYDN|REP_NO_SUBSCHEMA)
+};
+
+/* short hands for response members */
+#define	sr_attrs sr_un.sru_search.r_attrs
+#define	sr_entry sr_un.sru_search.r_entry
+#define	sr_operational_attrs sr_un.sru_search.r_operational_attrs
+#define sr_attr_flags sr_un.sru_search.r_attr_flags
+#define	sr_v2ref sr_un.sru_search.r_v2ref
+#define	sr_nentries sr_un.sru_search.r_nentries
+#define	sr_rspoid sr_un.sru_extended.r_rspoid
+#define	sr_rspdata sr_un.sru_extended.r_rspdata
+#define	sr_sasldata sr_un.sru_sasl.r_sasldata
+
+typedef int (BI_op_func) LDAP_P(( Operation *op, SlapReply *rs ));
+typedef BI_op_func BI_op_bind;
+typedef BI_op_func BI_op_unbind;
+typedef BI_op_func BI_op_search;
+typedef BI_op_func BI_op_compare;
+typedef BI_op_func BI_op_modify;
+typedef BI_op_func BI_op_modrdn;
+typedef BI_op_func BI_op_add;
+typedef BI_op_func BI_op_delete;
+typedef BI_op_func BI_op_abandon;
+typedef BI_op_func BI_op_extended;
+typedef BI_op_func BI_op_cancel;
+typedef BI_op_func BI_chk_referrals;
+typedef BI_op_func BI_chk_controls;
+typedef int (BI_entry_release_rw)
+	LDAP_P(( Operation *op, Entry *e, int rw ));
+typedef int (BI_entry_get_rw) LDAP_P(( Operation *op, struct berval *ndn,
+	ObjectClass *oc, AttributeDescription *at, int rw, Entry **e ));
+typedef int (BI_operational) LDAP_P(( Operation *op, SlapReply *rs ));
+typedef int (BI_has_subordinates) LDAP_P(( Operation *op,
+	Entry *e, int *hasSubs ));
+typedef int (BI_access_allowed) LDAP_P(( Operation *op, Entry *e,
+	AttributeDescription *desc, struct berval *val, slap_access_t access,
+	AccessControlState *state, slap_mask_t *maskp ));
+typedef int (BI_acl_group) LDAP_P(( Operation *op, Entry *target,
+	struct berval *gr_ndn, struct berval *op_ndn,
+	ObjectClass *group_oc, AttributeDescription *group_at ));
+typedef int (BI_acl_attribute) LDAP_P(( Operation *op, Entry *target,
+	struct berval *entry_ndn, AttributeDescription *entry_at,
+	BerVarray *vals, slap_access_t access ));
+struct OpExtra;
+typedef int (BI_op_txn) LDAP_P(( Operation *op, int txnop, struct OpExtra **ptr ));
+#define SLAP_TXN_BEGIN	1
+#define SLAP_TXN_COMMIT	2
+#define SLAP_TXN_ABORT	3
+
+typedef int (BI_conn_func) LDAP_P(( BackendDB *bd, Connection *c ));
+typedef BI_conn_func BI_connection_init;
+typedef BI_conn_func BI_connection_destroy;
+
+typedef int (BI_tool_entry_open) LDAP_P(( BackendDB *be, int mode ));
+typedef int (BI_tool_entry_close) LDAP_P(( BackendDB *be ));
+typedef ID (BI_tool_entry_first) LDAP_P(( BackendDB *be ));
+typedef ID (BI_tool_entry_first_x) LDAP_P(( BackendDB *be, struct berval *base, int scope, Filter *f ));
+typedef ID (BI_tool_entry_next) LDAP_P(( BackendDB *be ));
+typedef Entry* (BI_tool_entry_get) LDAP_P(( BackendDB *be, ID id ));
+typedef ID (BI_tool_entry_put) LDAP_P(( BackendDB *be, Entry *e, 
+	struct berval *text ));
+typedef int (BI_tool_entry_reindex) LDAP_P(( BackendDB *be, ID id, AttributeDescription **adv ));
+typedef int (BI_tool_sync) LDAP_P(( BackendDB *be ));
+typedef ID (BI_tool_dn2id_get) LDAP_P(( BackendDB *be, struct berval *dn ));
+typedef ID (BI_tool_entry_modify) LDAP_P(( BackendDB *be, Entry *e, 
+	struct berval *text ));
+typedef int (BI_tool_entry_delete) LDAP_P(( BackendDB *be, struct berval *ndn,
+	struct berval *text ));
+
+struct BackendInfo {
+	char	*bi_type; /* type of backend */
+
+	/*
+	 * per backend type routines:
+	 * bi_init: called to allocate a backend_info structure,
+	 *		called once BEFORE configuration file is read.
+	 *		bi_init() initializes this structure hence is
+	 *		called directly from be_initialize()
+	 * bi_config: called per 'backend' specific option
+	 *		all such options must before any 'database' options
+	 *		bi_config() is called only from read_config()
+	 * bi_open: called to open each database, called
+	 *		once AFTER configuration file is read but
+	 *		BEFORE any bi_db_open() calls.
+	 *		bi_open() is called from backend_startup()
+	 * bi_close: called to close each database, called
+	 *		once during shutdown after all bi_db_close calls.
+	 *		bi_close() is called from backend_shutdown()
+	 * bi_destroy: called to destroy each database, called
+	 *		once during shutdown after all bi_db_destroy calls.
+	 *		bi_destroy() is called from backend_destroy()
+	 */
+	BI_init	*bi_init;
+	BI_config	*bi_config;
+	BI_open *bi_open;
+	BI_pause	*bi_pause;
+	BI_unpause	*bi_unpause;
+	BI_close	*bi_close;
+	BI_destroy	*bi_destroy;
+
+	/*
+	 * per database routines:
+	 * bi_db_init: called to initialize each database,
+	 *	called upon reading 'database <type>' 
+	 *	called only from backend_db_init()
+	 * bi_db_config: called to configure each database,
+	 *  called per database to handle per database options
+	 *	called only from read_config()
+	 * bi_db_open: called to open each database
+	 *	called once per database immediately AFTER bi_open()
+	 *	calls but before daemon startup.
+	 *  called only by backend_startup()
+	 * bi_db_close: called to close each database
+	 *	called once per database during shutdown but BEFORE
+	 *  any bi_close call.
+	 *  called only by backend_shutdown()
+	 * bi_db_destroy: called to destroy each database
+	 *  called once per database during shutdown AFTER all
+	 *  bi_close calls but before bi_destroy calls.
+	 *  called only by backend_destroy()
+	 */
+	BI_db_init	*bi_db_init;
+	BI_db_config	*bi_db_config;
+	BI_db_open	*bi_db_open;
+	BI_db_close	*bi_db_close;
+	BI_db_destroy	*bi_db_destroy;
+
+	/* LDAP Operations Handling Routines */
+	BI_op_bind	*bi_op_bind;
+	BI_op_unbind	*bi_op_unbind;
+	BI_op_search	*bi_op_search;
+	BI_op_compare	*bi_op_compare;
+	BI_op_modify	*bi_op_modify;
+	BI_op_modrdn	*bi_op_modrdn;
+	BI_op_add	*bi_op_add;
+	BI_op_delete	*bi_op_delete;
+	BI_op_abandon	*bi_op_abandon;
+
+	/* Extended Operations Helper */
+	BI_op_extended	*bi_extended;
+	BI_op_cancel	*bi_op_cancel;
+
+	/* Auxiliary Functions */
+	BI_operational		*bi_operational;
+	BI_chk_referrals	*bi_chk_referrals;
+	BI_chk_controls		*bi_chk_controls;
+	BI_op_txn			*bi_op_txn;
+	BI_entry_get_rw		*bi_entry_get_rw;
+	BI_entry_release_rw	*bi_entry_release_rw;
+
+	BI_has_subordinates	*bi_has_subordinates;
+	BI_access_allowed	*bi_access_allowed;
+	BI_acl_group		*bi_acl_group;
+	BI_acl_attribute	*bi_acl_attribute;
+
+	BI_connection_init	*bi_connection_init;
+	BI_connection_destroy	*bi_connection_destroy;
+
+	/* hooks for slap tools */
+	BI_tool_entry_open	*bi_tool_entry_open;
+	BI_tool_entry_close	*bi_tool_entry_close;
+	BI_tool_entry_first	*bi_tool_entry_first;	/* deprecated */
+	BI_tool_entry_first_x	*bi_tool_entry_first_x;
+	BI_tool_entry_next	*bi_tool_entry_next;
+	BI_tool_entry_get	*bi_tool_entry_get;
+	BI_tool_entry_put	*bi_tool_entry_put;
+	BI_tool_entry_reindex	*bi_tool_entry_reindex;
+	BI_tool_sync		*bi_tool_sync;
+	BI_tool_dn2id_get	*bi_tool_dn2id_get;
+	BI_tool_entry_modify	*bi_tool_entry_modify;
+	BI_tool_entry_delete	*bi_tool_entry_delete;
+
+#define SLAP_INDEX_ADD_OP		0x0001
+#define SLAP_INDEX_DELETE_OP	0x0002
+
+	slap_mask_t	bi_flags; /* backend flags */
+#define SLAP_BFLAG_MONITOR			0x0001U /* a monitor backend */
+#define SLAP_BFLAG_CONFIG			0x0002U /* a config backend */
+#define SLAP_BFLAG_FRONTEND			0x0004U /* the frontendDB */
+#define SLAP_BFLAG_NOLASTMODCMD		0x0010U
+#define SLAP_BFLAG_INCREMENT		0x0100U
+#define SLAP_BFLAG_ALIASES			0x1000U
+#define SLAP_BFLAG_REFERRALS		0x2000U
+#define SLAP_BFLAG_SUBENTRIES		0x4000U
+#define SLAP_BFLAG_DYNAMIC			0x8000U
+#define SLAP_BFLAG_STANDALONE		0x10000U /* started up regardless of whether any databases use it */
+#define SLAP_BFLAG_TXNS				0x20000U /* supports LDAP transactions */
+
+/* overlay specific */
+#define	SLAPO_BFLAG_SINGLE		0x01000000U
+#define	SLAPO_BFLAG_DBONLY		0x02000000U
+#define	SLAPO_BFLAG_GLOBONLY		0x04000000U
+#define	SLAPO_BFLAG_DISABLED		0x08000000U
+#define	SLAPO_BFLAG_MASK		0xFF000000U
+
+#define SLAP_BFLAGS(be)		((be)->bd_info->bi_flags)
+#define SLAP_MONITOR(be)	(SLAP_BFLAGS(be) & SLAP_BFLAG_MONITOR)
+#define SLAP_CONFIG(be)		(SLAP_BFLAGS(be) & SLAP_BFLAG_CONFIG)
+#define SLAP_FRONTEND(be)	(SLAP_BFLAGS(be) & SLAP_BFLAG_FRONTEND)
+#define SLAP_INCREMENT(be)	(SLAP_BFLAGS(be) & SLAP_BFLAG_INCREMENT)
+#define SLAP_ALIASES(be)	(SLAP_BFLAGS(be) & SLAP_BFLAG_ALIASES)
+#define SLAP_REFERRALS(be)	(SLAP_BFLAGS(be) & SLAP_BFLAG_REFERRALS)
+#define SLAP_SUBENTRIES(be)	(SLAP_BFLAGS(be) & SLAP_BFLAG_SUBENTRIES)
+#define SLAP_DYNAMIC(be)	((SLAP_BFLAGS(be) & SLAP_BFLAG_DYNAMIC) || (SLAP_DBFLAGS(be) & SLAP_DBFLAG_DYNAMIC))
+#define SLAP_NOLASTMODCMD(be)	(SLAP_BFLAGS(be) & SLAP_BFLAG_NOLASTMODCMD)
+#define SLAP_LASTMODCMD(be)	(!SLAP_NOLASTMODCMD(be))
+#define SLAP_TXNS(be)		(SLAP_BFLAGS(be) & SLAP_BFLAG_TXNS)
+
+/* overlay specific */
+#define SLAPO_SINGLE(be)	(SLAP_BFLAGS(be) & SLAPO_BFLAG_SINGLE)
+#define SLAPO_DBONLY(be)	(SLAP_BFLAGS(be) & SLAPO_BFLAG_DBONLY)
+#define SLAPO_GLOBONLY(be)	(SLAP_BFLAGS(be) & SLAPO_BFLAG_GLOBONLY)
+#define SLAPO_DISABLED(be)	(SLAP_BFLAGS(be) & SLAPO_BFLAG_DISABLED)
+
+	char	**bi_controls;		/* supported controls */
+	char	bi_ctrls[SLAP_MAX_CIDS + 1];
+
+	unsigned int bi_nDB;	/* number of databases of this type */
+	struct ConfigOCs *bi_cf_ocs;
+	char	**bi_obsolete_names;
+	void	*bi_extra;		/* backend type-specific APIs */
+	void	*bi_private;	/* backend type-specific config data */
+	LDAP_STAILQ_ENTRY(BackendInfo) bi_next ;
+};
+
+#define c_authtype	c_authz.sai_method
+#define c_authmech	c_authz.sai_mech
+#define c_dn		c_authz.sai_dn
+#define c_ndn		c_authz.sai_ndn
+#define c_ssf		c_authz.sai_ssf
+#define c_transport_ssf	c_authz.sai_transport_ssf
+#define c_tls_ssf	c_authz.sai_tls_ssf
+#define c_sasl_ssf	c_authz.sai_sasl_ssf
+
+#define o_authtype	o_authz.sai_method
+#define o_authmech	o_authz.sai_mech
+#define o_dn		o_authz.sai_dn
+#define o_ndn		o_authz.sai_ndn
+#define o_ssf		o_authz.sai_ssf
+#define o_transport_ssf	o_authz.sai_transport_ssf
+#define o_tls_ssf	o_authz.sai_tls_ssf
+#define o_sasl_ssf	o_authz.sai_sasl_ssf
+
+typedef int (slap_response)( Operation *, SlapReply * );
+
+struct slap_callback;
+typedef void (slap_writewait)( Operation *, struct slap_callback * );
+
+typedef struct slap_callback {
+	struct slap_callback *sc_next;
+	slap_response *sc_response;
+	slap_response *sc_cleanup;
+	void *sc_private;
+	slap_writewait *sc_writewait;
+} slap_callback;
+
+struct slap_overinfo;
+
+typedef enum slap_operation_e {
+	op_bind = 0,
+	op_unbind,
+	op_search,
+	op_compare,
+	op_modify,
+	op_modrdn,
+	op_add,
+	op_delete,
+	op_abandon,
+	op_extended,
+	op_cancel,
+	op_aux_operational,
+	op_aux_chk_referrals,
+	op_aux_chk_controls,
+	op_txn,
+	op_last
+} slap_operation_t;
+
+typedef struct slap_overinst {
+	BackendInfo on_bi;
+	slap_response *on_response;
+	struct slap_overinfo *on_info;
+	struct slap_overinst *on_next;
+} slap_overinst;
+
+typedef struct slap_overinfo {
+	BackendInfo oi_bi;
+	BackendInfo *oi_orig;
+	BackendDB	*oi_origdb;
+	struct slap_overinst *oi_list;
+} slap_overinfo;
+
+/* Should successive callbacks in a chain be processed? */
+#define	SLAP_CB_BYPASS		0x08800
+#define	SLAP_CB_CONTINUE	0x08000
+
+/*
+ * Paged Results state
+ */
+typedef unsigned long PagedResultsCookie;
+typedef struct PagedResultsState {
+	Backend *ps_be;
+	ber_int_t ps_size;
+	int ps_count;
+	PagedResultsCookie ps_cookie;
+	struct berval ps_cookieval;
+} PagedResultsState;
+
+struct slap_csn_entry {
+	Operation *ce_op;
+	struct berval ce_csn;
+	int ce_sid;
+#define SLAP_CSN_PENDING	1
+#define SLAP_CSN_COMMIT		2
+	long ce_state;
+	LDAP_TAILQ_ENTRY (slap_csn_entry) ce_csn_link;
+};
+
+/*
+ * Caches the result of a backend_group check for ACL evaluation
+ */
+typedef struct GroupAssertion {
+	struct GroupAssertion *ga_next;
+	Backend *ga_be;
+	ObjectClass *ga_oc;
+	AttributeDescription *ga_at;
+	int ga_res;
+	ber_len_t ga_len;
+	char ga_ndn[1];
+} GroupAssertion;
+
+struct slap_control_ids {
+	int sc_LDAPsync;
+	int sc_assert;
+	int sc_domainScope;
+	int sc_dontUseCopy;
+	int sc_manageDSAit;
+	int sc_modifyIncrement;
+	int sc_noOp;
+	int sc_pagedResults;
+	int sc_permissiveModify;
+	int sc_postRead;
+	int sc_preRead;
+	int sc_proxyAuthz;
+	int sc_relax;
+	int sc_searchOptions;
+#ifdef SLAP_CONTROL_X_SORTEDRESULTS
+	int sc_sortedResults;
+#endif
+	int sc_subentries;
+#ifdef SLAP_CONTROL_X_TREE_DELETE
+	int sc_treeDelete;
+#endif
+	int sc_txnSpec;
+#ifdef SLAP_CONTROL_X_SESSION_TRACKING
+	int sc_sessionTracking;
+#endif
+	int sc_valuesReturnFilter;
+#ifdef SLAP_CONTROL_X_WHATFAILED
+	int sc_whatFailed;
+#endif
+#ifdef LDAP_CONTROL_X_LAZY_COMMIT
+	int sc_lazyCommit;
+#endif
+};
+
+/*
+ * Operation indices
+ */
+typedef enum {
+	SLAP_OP_BIND = 0,
+	SLAP_OP_UNBIND,
+	SLAP_OP_SEARCH,
+	SLAP_OP_COMPARE,
+	SLAP_OP_MODIFY,
+	SLAP_OP_MODRDN,
+	SLAP_OP_ADD,
+	SLAP_OP_DELETE,
+	SLAP_OP_ABANDON,
+	SLAP_OP_EXTENDED,
+	SLAP_OP_LAST
+} slap_op_t;
+
+typedef struct slap_counters_t {
+	struct slap_counters_t	*sc_next;
+	ldap_pvt_thread_mutex_t	sc_mutex;
+	ldap_pvt_mp_t		sc_bytes;
+	ldap_pvt_mp_t		sc_pdu;
+	ldap_pvt_mp_t		sc_entries;
+	ldap_pvt_mp_t		sc_refs;
+
+	ldap_pvt_mp_t		sc_ops_completed;
+	ldap_pvt_mp_t		sc_ops_initiated;
+	ldap_pvt_mp_t		sc_ops_completed_[SLAP_OP_LAST];
+	ldap_pvt_mp_t		sc_ops_initiated_[SLAP_OP_LAST];
+} slap_counters_t;
+
+/*
+ * represents an operation pending from an ldap client
+ */
+typedef struct Opheader {
+	unsigned long	oh_opid;	/* id of this operation */
+	unsigned long	oh_connid;	/* id of conn initiating this op */
+	Connection	*oh_conn;	/* connection spawning this op */
+
+	ber_int_t	oh_msgid;	/* msgid of the request */
+	ber_int_t	oh_protocol;	/* version of the LDAP protocol used by client */
+
+	ldap_pvt_thread_t	oh_tid;	/* thread handling this op */
+
+	void	*oh_threadctx;		/* thread pool thread context */
+	void	*oh_tmpmemctx;		/* slab malloc context */
+	BerMemoryFunctions *oh_tmpmfuncs;
+
+	slap_counters_t	*oh_counters;
+
+	char		oh_log_prefix[ /* sizeof("conn= op=") + 2*LDAP_PVT_INTTYPE_CHARS(unsigned long) */ SLAP_TEXT_BUFLEN ];
+
+#ifdef LDAP_SLAPI
+	void	*oh_extensions;		/* NS-SLAPI plugin */
+#endif
+} Opheader;
+
+typedef union OpRequest {
+	req_add_s oq_add;
+	req_bind_s oq_bind;
+	req_compare_s oq_compare;
+	req_modify_s oq_modify;
+	req_modrdn_s oq_modrdn;
+	req_search_s oq_search;
+	req_abandon_s oq_abandon;
+	req_abandon_s oq_cancel;
+	req_extended_s oq_extended;
+	req_pwdexop_s oq_pwdexop;
+} OpRequest;
+
+/* This is only a header. Actual users should define their own
+ * structs with the oe_next / oe_key fields at the top and
+ * whatever else they need following.
+ */
+typedef struct OpExtra {
+	LDAP_SLIST_ENTRY(OpExtra) oe_next;
+	void *oe_key;
+} OpExtra;
+
+typedef struct OpExtraDB {
+	OpExtra oe;
+	BackendDB *oe_db;
+} OpExtraDB;
+
+struct Operation {
+	Opheader *o_hdr;
+
+#define o_opid o_hdr->oh_opid
+#define o_connid o_hdr->oh_connid
+#define o_conn o_hdr->oh_conn
+#define o_msgid o_hdr->oh_msgid
+#define o_protocol o_hdr->oh_protocol
+#define o_tid o_hdr->oh_tid
+#define o_threadctx o_hdr->oh_threadctx
+#define o_tmpmemctx o_hdr->oh_tmpmemctx
+#define o_tmpmfuncs o_hdr->oh_tmpmfuncs
+#define o_counters o_hdr->oh_counters
+
+#define	o_tmpalloc	o_tmpmfuncs->bmf_malloc
+#define o_tmpcalloc	o_tmpmfuncs->bmf_calloc
+#define	o_tmprealloc	o_tmpmfuncs->bmf_realloc
+#define	o_tmpfree	o_tmpmfuncs->bmf_free
+
+#define o_log_prefix o_hdr->oh_log_prefix
+
+	ber_tag_t	o_tag;		/* tag of the request */
+	time_t		o_time;		/* time op was initiated */
+	int			o_tincr;	/* counter for multiple ops with same o_time */
+	int			o_tusec;	/* microsecond timestamp */
+	struct timeval o_qtime;	/* time spent in queues before execution */
+
+	BackendDB	*o_bd;	/* backend DB processing this op */
+	struct berval	o_req_dn;	/* DN of target of request */
+	struct berval	o_req_ndn;
+
+	OpRequest o_request;
+
+/* short hands for union members */
+#define oq_add o_request.oq_add
+#define oq_bind o_request.oq_bind
+#define oq_compare o_request.oq_compare
+#define oq_modify o_request.oq_modify
+#define oq_modrdn o_request.oq_modrdn
+#define oq_search o_request.oq_search
+#define oq_abandon o_request.oq_abandon
+#define oq_cancel o_request.oq_cancel
+#define oq_extended o_request.oq_extended
+#define oq_pwdexop o_request.oq_pwdexop
+
+/* short hands for inner request members */
+#define orb_method oq_bind.rb_method
+#define orb_cred oq_bind.rb_cred
+#define orb_edn oq_bind.rb_edn
+#define orb_ssf oq_bind.rb_ssf
+#define orb_mech oq_bind.rb_mech
+
+#define ors_scope oq_search.rs_scope
+#define ors_deref oq_search.rs_deref
+#define ors_slimit oq_search.rs_slimit
+#define ors_tlimit oq_search.rs_tlimit
+#define ors_limit oq_search.rs_limit
+#define ors_attrsonly oq_search.rs_attrsonly
+#define ors_attrs oq_search.rs_attrs
+#define ors_filter oq_search.rs_filter
+#define ors_filterstr oq_search.rs_filterstr
+
+#define orr_modlist oq_modrdn.rs_mods.rs_modlist
+#define orr_no_opattrs oq_modrdn.rs_mods.rs_no_opattrs
+#define orr_deleteoldrdn oq_modrdn.rs_deleteoldrdn
+#define orr_newrdn oq_modrdn.rs_newrdn
+#define orr_nnewrdn oq_modrdn.rs_nnewrdn
+#define orr_newSup oq_modrdn.rs_newSup
+#define orr_nnewSup oq_modrdn.rs_nnewSup
+
+#define orc_ava oq_compare.rs_ava
+
+#define ora_e oq_add.rs_e
+#define ora_modlist oq_add.rs_modlist
+
+#define orn_msgid oq_abandon.rs_msgid
+
+#define orm_modlist oq_modify.rs_mods.rs_modlist
+#define orm_no_opattrs oq_modify.rs_mods.rs_no_opattrs
+#define orm_increment oq_modify.rs_increment
+
+#define ore_reqoid oq_extended.rs_reqoid
+#define ore_flags oq_extended.rs_flags
+#define ore_reqdata oq_extended.rs_reqdata
+	volatile sig_atomic_t o_abandon;	/* abandon flag */
+	volatile sig_atomic_t o_cancel;		/* cancel flag */
+#define SLAP_CANCEL_NONE				0x00
+#define SLAP_CANCEL_REQ					0x01
+#define SLAP_CANCEL_ACK					0x02
+#define SLAP_CANCEL_DONE				0x03
+
+	GroupAssertion *o_groups;
+	char o_do_not_cache;	/* don't cache groups from this op */
+	char o_is_auth_check;	/* authorization in progress */
+	char o_dont_replicate;
+	slap_access_t o_acl_priv;
+
+	char o_nocaching;
+	char o_delete_glue_parent;
+	char o_no_schema_check;
+#define get_no_schema_check(op)			((op)->o_no_schema_check)
+	char o_no_subordinate_glue;
+#define get_no_subordinate_glue(op)		((op)->o_no_subordinate_glue)
+
+#define SLAP_CONTROL_NONE	0
+#define SLAP_CONTROL_IGNORED	1
+#define SLAP_CONTROL_NONCRITICAL 2
+#define SLAP_CONTROL_CRITICAL	3
+#define	SLAP_CONTROL_MASK	3
+
+/* spare bits for simple flags */
+#define SLAP_CONTROL_SHIFT	4	/* shift to reach data bits */
+#define SLAP_CONTROL_DATA0	0x10
+#define SLAP_CONTROL_DATA1	0x20
+#define SLAP_CONTROL_DATA2	0x40
+#define SLAP_CONTROL_DATA3	0x80
+
+#define _SCM(x)	((x) & SLAP_CONTROL_MASK)
+
+	char o_ctrlflag[SLAP_MAX_CIDS];	/* per-control flags */
+	void **o_controls;		/* per-control state */
+
+#define o_dontUseCopy			o_ctrlflag[slap_cids.sc_dontUseCopy]
+#define get_dontUseCopy(op)		_SCM((op)->o_dontUseCopy)
+
+#define o_relax				o_ctrlflag[slap_cids.sc_relax]
+#define get_relax(op)		_SCM((op)->o_relax)
+
+#define o_managedsait	o_ctrlflag[slap_cids.sc_manageDSAit]
+#define get_manageDSAit(op)				_SCM((op)->o_managedsait)
+
+#define o_noop	o_ctrlflag[slap_cids.sc_noOp]
+#define o_proxy_authz	o_ctrlflag[slap_cids.sc_proxyAuthz]
+#define o_subentries	o_ctrlflag[slap_cids.sc_subentries]
+
+#define get_subentries(op)				_SCM((op)->o_subentries)
+#define	o_subentries_visibility	o_ctrlflag[slap_cids.sc_subentries]
+
+#define set_subentries_visibility(op)	((op)->o_subentries |= SLAP_CONTROL_DATA0)
+#define get_subentries_visibility(op)	(((op)->o_subentries & SLAP_CONTROL_DATA0) != 0)
+
+#define o_assert	o_ctrlflag[slap_cids.sc_assert]
+#define get_assert(op)					((int)(op)->o_assert)
+#define o_assertion	o_controls[slap_cids.sc_assert]
+#define get_assertion(op)				((op)->o_assertion)
+
+#define	o_valuesreturnfilter	o_ctrlflag[slap_cids.sc_valuesReturnFilter]
+#define o_vrFilter	o_controls[slap_cids.sc_valuesReturnFilter]
+
+#define o_permissive_modify	o_ctrlflag[slap_cids.sc_permissiveModify]
+#define get_permissiveModify(op)		((int)(op)->o_permissive_modify)
+
+#define o_domain_scope	o_ctrlflag[slap_cids.sc_domainScope]
+#define get_domainScope(op)				((int)(op)->o_domain_scope)
+
+#ifdef SLAP_CONTROL_X_TREE_DELETE
+#define	o_tree_delete	o_ctrlflag[slap_cids.sc_treeDelete]
+#define get_treeDelete(op)				((int)(op)->o_tree_delete)
+#endif
+
+#define o_preread	o_ctrlflag[slap_cids.sc_preRead]
+#define o_postread	o_ctrlflag[slap_cids.sc_postRead]
+
+#define	o_preread_attrs	o_controls[slap_cids.sc_preRead]
+#define o_postread_attrs	o_controls[slap_cids.sc_postRead]
+
+#define o_pagedresults	o_ctrlflag[slap_cids.sc_pagedResults]
+#define o_pagedresults_state	o_controls[slap_cids.sc_pagedResults]
+#define get_pagedresults(op)			((int)(op)->o_pagedresults)
+
+#ifdef SLAP_CONTROL_X_SORTEDRESULTS
+#define o_sortedresults		o_ctrlflag[slap_cids.sc_sortedResults]
+#endif
+
+#define o_txnSpec		o_ctrlflag[slap_cids.sc_txnSpec]
+
+#ifdef SLAP_CONTROL_X_SESSION_TRACKING
+#define o_session_tracking	o_ctrlflag[slap_cids.sc_sessionTracking]
+#define o_tracked_sessions	o_controls[slap_cids.sc_sessionTracking]
+#define get_sessionTracking(op)			((int)(op)->o_session_tracking)
+#endif
+
+#ifdef SLAP_CONTROL_X_WHATFAILED
+#define o_whatFailed o_ctrlflag[slap_cids.sc_whatFailed]
+#define get_whatFailed(op)				_SCM((op)->o_whatFailed)
+#endif
+
+#ifdef SLAP_CONTROL_X_LAZY_COMMIT
+#define o_lazyCommit o_ctrlflag[slap_cids.sc_lazyCommit]
+#define get_lazyCommit(op)				_SCM((op)->o_lazyCommit)
+#endif
+
+#define o_sync			o_ctrlflag[slap_cids.sc_LDAPsync]
+
+	AuthorizationInformation o_authz;
+
+	BerElement	*o_ber;		/* ber of the request */
+	BerElement	*o_res_ber;	/* ber of the CLDAP reply or readback control */
+	slap_callback *o_callback;	/* callback pointers */
+	LDAPControl	**o_ctrls;	 /* controls */
+	struct berval o_csn;
+
+	/* DEPRECATE o_private - use o_extra instead */
+	void	*o_private;	/* anything the backend needs */
+	LDAP_SLIST_HEAD(o_e, OpExtra) o_extra;	/* anything the backend needs */
+
+	LDAP_STAILQ_ENTRY(Operation)	o_next;	/* next operation in list */
+};
+
+typedef struct OperationBuffer {
+	Operation	ob_op;
+	Opheader	ob_hdr;
+	void		*ob_controls[SLAP_MAX_CIDS];
+} OperationBuffer;
+
+#define send_ldap_error( op, rs, err, text ) do { \
+		(rs)->sr_err = err; (rs)->sr_text = text; \
+		((op)->o_conn->c_send_ldap_result)( op, rs ); \
+	} while (0)
+#define send_ldap_discon( op, rs, err, text ) do { \
+		(rs)->sr_err = err; (rs)->sr_text = text; \
+		send_ldap_disconnect( op, rs ); \
+	} while (0)
+
+typedef void (SEND_LDAP_RESULT)(
+	Operation *op, SlapReply *rs);
+typedef int (SEND_SEARCH_ENTRY)(
+	Operation *op, SlapReply *rs);
+typedef int (SEND_SEARCH_REFERENCE)(
+	Operation *op, SlapReply *rs);
+typedef void (SEND_LDAP_EXTENDED)(
+	Operation *op, SlapReply *rs);
+typedef void (SEND_LDAP_INTERMEDIATE)(
+	Operation *op, SlapReply *rs);
+
+#define send_ldap_result( op, rs ) \
+	((op)->o_conn->c_send_ldap_result)( op, rs )
+#define send_search_entry( op, rs ) \
+	((op)->o_conn->c_send_search_entry)( op, rs )
+#define send_search_reference( op, rs ) \
+	((op)->o_conn->c_send_search_reference)( op, rs )
+#define send_ldap_extended( op, rs ) \
+	((op)->o_conn->c_send_ldap_extended)( op, rs )
+#define send_ldap_intermediate( op, rs ) \
+	((op)->o_conn->c_send_ldap_intermediate)( op, rs )
+
+typedef struct Listener Listener;
+
+/*
+ * represents a connection from an ldap client
+ */
+/* connection state (protected by c_mutex ) */
+enum sc_conn_state {
+	SLAP_C_INVALID = 0,		/* MUST BE ZERO (0) */
+	SLAP_C_INACTIVE,		/* zero threads */
+	SLAP_C_CLOSING,			/* closing */
+	SLAP_C_ACTIVE,			/* one or more threads */
+	SLAP_C_BINDING,			/* binding */
+	SLAP_C_CLIENT			/* outbound client conn */
+};
+struct Connection {
+	enum sc_conn_state	c_conn_state;	/* connection state */
+	int			c_conn_idx;		/* slot in connections array */
+	ber_socket_t	c_sd;
+	const char	*c_close_reason; /* why connection is closing */
+
+	ldap_pvt_thread_mutex_t	c_mutex; /* protect the connection */
+	Sockbuf		*c_sb;			/* ber connection stuff		  */
+
+	/* only can be changed by connect_init */
+	time_t		c_starttime;	/* when the connection was opened */
+	time_t		c_activitytime;	/* when the connection was last used */
+	unsigned long		c_connid;	/* id of this connection for stats*/
+
+	struct berval	c_peer_domain;	/* DNS name of client */
+	struct berval	c_peer_name;	/* peer name (trans=addr:port) */
+	Listener	*c_listener;
+#define c_listener_url c_listener->sl_url	/* listener URL */
+#define c_sock_name c_listener->sl_name	/* sock name (trans=addr:port) */
+
+	/* only can be changed by binding thread */
+	struct berval	c_sasl_bind_mech;			/* mech in progress */
+	struct berval	c_sasl_dn;	/* temporary storage */
+	struct berval	c_sasl_authz_dn;	/* SASL proxy authz */
+
+	/* authorization backend */
+	Backend *c_authz_backend;
+	void	*c_authz_cookie;
+#define SLAP_IS_AUTHZ_BACKEND( op )	\
+	( (op)->o_bd != NULL \
+		&& (op)->o_bd->be_private != NULL \
+		&& (op)->o_conn != NULL \
+		&& (op)->o_conn->c_authz_backend != NULL \
+		&& ( (op)->o_bd->be_private == (op)->o_conn->c_authz_backend->be_private \
+			|| (op)->o_bd->be_private == (op)->o_conn->c_authz_cookie ) )
+
+	AuthorizationInformation c_authz;
+
+	ber_int_t	c_protocol;	/* version of the LDAP protocol used by client */
+
+	LDAP_STAILQ_HEAD(c_o, Operation) c_ops;	/* list of operations being processed */
+	LDAP_STAILQ_HEAD(c_po, Operation) c_pending_ops;	/* list of pending operations */
+
+	ldap_pvt_thread_mutex_t	c_write1_mutex;	/* only one pdu written at a time */
+	ldap_pvt_thread_cond_t	c_write1_cv;	/* only one pdu written at a time */
+
+	BerElement	*c_currentber;	/* ber we're attempting to read */
+	int			c_writers;		/* number of writers waiting */
+	char		c_writing;		/* someone is writing */
+
+	char		c_sasl_bind_in_progress;	/* multi-op bind in progress */
+	char		c_writewaiter;	/* true if blocked on write */
+
+
+#define	CONN_IS_TLS	1
+#define	CONN_IS_UDP	2
+#define	CONN_IS_CLIENT	4
+#define	CONN_IS_IPC	8
+
+#ifdef LDAP_CONNECTIONLESS
+	char	c_is_udp;		/* true if this is (C)LDAP over UDP */
+#endif
+#ifdef HAVE_TLS
+	char	c_is_tls;		/* true if this LDAP over raw TLS */
+	char	c_needs_tls_accept;	/* true if SSL_accept should be called */
+#endif
+	char	c_sasl_layers;	 /* true if we need to install SASL i/o handlers */
+	char	c_sasl_done;		/* SASL completed once */
+	void	*c_sasl_authctx;	/* SASL authentication context */
+	void	*c_sasl_sockctx;	/* SASL security layer context */
+	void	*c_sasl_extra;		/* SASL session extra stuff */
+	void	*c_sasl_cbind;		/* SASL channel binding */
+	Operation	*c_sasl_bindop;	/* set to current op if it's a bind */
+
+#define CONN_TXN_INACTIVE 0
+#define CONN_TXN_SPECIFY 1
+#define CONN_TXN_SETTLE -1
+	int c_txn;
+
+	Backend *c_txn_backend;
+	LDAP_STAILQ_HEAD(c_to, Operation) c_txn_ops; /* list of operations in txn */
+
+	PagedResultsState c_pagedresults_state; /* paged result state */
+
+	long	c_n_ops_received;	/* num of ops received (next op_id) */
+	long	c_n_ops_executing;	/* num of ops currently executing */
+	long	c_n_ops_pending;	/* num of ops pending execution */
+	long	c_n_ops_completed;	/* num of ops completed */
+	long	c_n_ops_async;		/* mum of ops currently executing asynchronously */
+
+	long	c_n_get;		/* num of get calls */
+	long	c_n_read;		/* num of read calls */
+	long	c_n_write;		/* num of write calls */
+
+	void	*c_extensions;		/* Netscape plugin */
+
+	/*
+	 * Client connection handling
+	 */
+	ldap_pvt_thread_start_t	*c_clientfunc;
+	void	*c_clientarg;
+
+	/*
+	 * These are the "callbacks" that are available for back-ends to
+	 * supply data back to connected clients that are connected
+	 * through the "front-end".
+	 */
+	SEND_LDAP_RESULT *c_send_ldap_result;
+	SEND_SEARCH_ENTRY *c_send_search_entry;
+	SEND_SEARCH_REFERENCE *c_send_search_reference;
+	SEND_LDAP_EXTENDED *c_send_ldap_extended;
+	SEND_LDAP_INTERMEDIATE *c_send_ldap_intermediate;
+};
+
+#ifdef LDAP_DEBUG
+#ifdef LDAP_SYSLOG
+#ifdef LOG_LOCAL4
+#define SLAP_DEFAULT_SYSLOG_USER	LOG_LOCAL4
+#endif /* LOG_LOCAL4 */
+#endif /* !LDAP_SYSLOG */
+#endif /* !LDAP_DEBUG */
+
+/*
+ * listener; need to access it from monitor backend
+ */
+struct Listener {
+	struct berval sl_url;
+	struct berval sl_name;
+	mode_t	sl_perms;
+#ifdef HAVE_TLS
+	int		sl_is_tls;
+#endif
+#ifdef LDAP_CONNECTIONLESS
+	int	sl_is_udp;		/* UDP listener is also data port */
+#endif
+	int	sl_is_proxied;
+	int	sl_mute;	/* Listener is temporarily disabled due to emfile */
+	int	sl_busy;	/* Listener is busy (accept thread activated) */
+	ber_socket_t sl_sd;
+	Sockaddr sl_sa;
+#define sl_addr	sl_sa.sa_in_addr
+#define LDAP_TCP_BUFFER
+#ifdef LDAP_TCP_BUFFER
+	int	sl_tcp_rmem;	/* custom TCP read buffer size */
+	int	sl_tcp_wmem;	/* custom TCP write buffer size */
+#endif
+};
+
+/*
+ * Better know these all around slapd
+ */
+#define SLAP_LDAPDN_PRETTY 0x1
+#define SLAP_LDAPDN_MAXLEN 8192
+
+/* number of response controls supported */
+#define SLAP_MAX_RESPONSE_CONTROLS   6
+
+#ifdef SLAP_SCHEMA_EXPOSE
+#define SLAP_CTRL_HIDE				0x00000000U
+#else
+#define SLAP_CTRL_HIDE				0x80000000U
+#endif
+
+#define SLAP_CTRL_REQUIRES_ROOT		0x40000000U /* for Relax */
+
+#define SLAP_CTRL_GLOBAL			0x00800000U
+#define SLAP_CTRL_GLOBAL_SEARCH		0x00010000U	/* for NOOP */
+
+#define SLAP_CTRL_OPFLAGS			0x0000FFFFU
+#define SLAP_CTRL_ABANDON			0x00000001U
+#define SLAP_CTRL_ADD				0x00002002U
+#define SLAP_CTRL_BIND				0x00000004U
+#define SLAP_CTRL_COMPARE			0x00001008U
+#define SLAP_CTRL_DELETE			0x00002010U
+#define SLAP_CTRL_MODIFY			0x00002020U
+#define SLAP_CTRL_RENAME			0x00002040U
+#define SLAP_CTRL_SEARCH			0x00001080U
+#define SLAP_CTRL_UNBIND			0x00000100U
+
+#define SLAP_CTRL_INTROGATE	(SLAP_CTRL_COMPARE|SLAP_CTRL_SEARCH)
+#define SLAP_CTRL_UPDATE \
+	(SLAP_CTRL_ADD|SLAP_CTRL_DELETE|SLAP_CTRL_MODIFY|SLAP_CTRL_RENAME)
+#define SLAP_CTRL_ACCESS	(SLAP_CTRL_INTROGATE|SLAP_CTRL_UPDATE)
+
+typedef int (SLAP_CTRL_PARSE_FN) LDAP_P((
+	Operation *op,
+	SlapReply *rs,
+	LDAPControl *ctrl ));
+
+typedef int (*SLAP_ENTRY_INFO_FN) LDAP_P(( void *arg, Entry *e ));
+
+#define SLAP_SLAB_SIZE	(1024*1024)
+#define SLAP_SLAB_STACK 1
+
+#define SLAP_ZONE_ALLOC 1
+#undef SLAP_ZONE_ALLOC
+
+#ifdef LDAP_COMP_MATCH
+/*
+ * Extensible Filter Definition
+ *
+ * MatchingRuleAssertion := SEQUENCE {
+ *	matchingRule	[1] MatchingRuleId OPTIONAL,
+ *	type		[2] AttributeDescription OPTIONAL,
+ *	matchValue	[3] AssertionValue,
+ *	dnAttributes	[4] BOOLEAN DEFAULT FALSE }
+ *
+ * Following ComponentFilter is contained in matchValue
+ *
+ * ComponentAssertion ::= SEQUENCE {
+ *	component		ComponentReference (SIZE(1..MAX)) OPTIONAL
+ *	useDefaultValues	BOOLEAN DEFAULT TRUE,
+ *	rule			MATCHING-RULE.&id,
+ *	value			MATCHING-RULE.&AssertionType }
+ *
+ * ComponentFilter ::= CHOICE {
+ *	item	[0] ComponentAssertion,
+ *	and	[1] SEQUENCE OF ComponentFilter,
+ *	or	[2] SEQUENCE OF ComponentFilter,
+ *	not	[3] ComponentFilter }
+ */
+
+#define LDAP_COMPREF_IDENTIFIER		((ber_tag_t) 0x80U)
+#define LDAP_COMPREF_FROM_BEGINNING	((ber_tag_t) 0x81U)
+#define LDAP_COMPREF_COUNT		((ber_tag_t) 0x82U)
+#define LDAP_COMPREF_FROM_END		((ber_tag_t) 0x83U)
+#define LDAP_COMPREF_CONTENT		((ber_tag_t) 0x84U)
+#define LDAP_COMPREF_SELECT		((ber_tag_t) 0x85U)
+#define LDAP_COMPREF_ALL		((ber_tag_t) 0x86U)
+#define LDAP_COMPREF_DEFINED		((ber_tag_t) 0x87U)
+#define LDAP_COMPREF_UNDEFINED		((ber_tag_t) 0x88U)
+
+#define LDAP_COMP_FILTER_AND		((ber_tag_t) 0xa0U)
+#define LDAP_COMP_FILTER_OR		((ber_tag_t) 0xa1U)
+#define LDAP_COMP_FILTER_NOT		((ber_tag_t) 0xa2U)
+#define LDAP_COMP_FILTER_ITEM		((ber_tag_t) 0xa3U)
+#define LDAP_COMP_FILTER_UNDEFINED	((ber_tag_t) 0xa4U)
+
+typedef struct ComponentId ComponentId;
+typedef struct ComponentReference ComponentReference;
+typedef struct ComponentAssertion ComponentAssertion;
+typedef struct ComponentAssertionValue ComponentAssertionValue;
+typedef struct ComponentSyntaxInfo ComponentSyntaxInfo;
+typedef struct ComponentDesc ComponentDesc;
+
+struct ComponentData {
+	void			*cd_mem_op;	/* nibble memory handler */
+	ComponentSyntaxInfo**	cd_tree;	/* component tree */
+};
+
+struct ComponentId {
+	int		ci_type;
+	ComponentId	*ci_next;
+
+	union comp_id_value{
+		BerValue	ci_identifier;
+		ber_int_t	ci_from_beginning;
+		ber_int_t	ci_count;
+		ber_int_t	ci_from_end;
+		ber_int_t	ci_content;
+		BerValue	ci_select_value;
+		char		ci_all;
+	} ci_val;
+};
+
+struct ComponentReference {
+	ComponentId	*cr_list;
+	ComponentId	*cr_curr;
+	struct berval	cr_string;
+	int cr_len;
+	/* Component Indexing */
+	int		cr_asn_type_id;
+	slap_mask_t	cr_indexmask;
+	AttributeDescription* cr_ad;
+	BerVarray	cr_nvals;
+	ComponentReference* cr_next;
+};
+
+struct ComponentAssertion {
+	ComponentReference	*ca_comp_ref;
+	ber_int_t		ca_use_def;
+	MatchingRule		*ca_ma_rule;
+	struct berval		ca_ma_value;
+	ComponentData		ca_comp_data; /* componentized assertion */
+	ComponentFilter		*ca_cf;
+	MatchingRuleAssertion   *ca_mra;
+};
+
+struct ComponentFilter {
+	ber_tag_t	cf_choice;
+	union cf_un_u {
+		ber_int_t		cf_un_result;
+		ComponentAssertion	*cf_un_ca;
+		ComponentFilter		*cf_un_complex;
+	} cf_un;
+
+#define cf_ca		cf_un.cf_un_ca
+#define cf_result	cf_un.cf_un_result
+#define cf_and		cf_un.cf_un_complex
+#define cf_or		cf_un.cf_un_complex
+#define cf_not		cf_un.cf_un_complex
+#define cf_any		cf_un.cf_un_complex
+	
+	ComponentFilter	*cf_next;
+};
+
+struct ComponentAssertionValue {
+	char* cav_buf;
+	char* cav_ptr;
+	char* cav_end;
+};
+
+typedef int encoder_func LDAP_P((
+	void* b,
+	void* comp));
+
+typedef int gser_decoder_func LDAP_P((
+	void* mem_op,
+	void* b,
+	ComponentSyntaxInfo** comp_syn_info,
+	int* len,
+	int mode));
+
+typedef int comp_free_func LDAP_P((
+	void* b));
+
+typedef int ber_decoder_func LDAP_P((
+	void* mem_op,
+	void* b,
+	int tag,
+	int elmtLen,
+	ComponentSyntaxInfo* comp_syn_info,
+	int* len,
+	int mode));
+
+typedef int ber_tag_decoder_func LDAP_P((
+	void* mem_op,
+	void* b,
+	ComponentSyntaxInfo* comp_syn_info,
+	int* len,
+	int mode));
+
+typedef void* extract_component_from_id_func LDAP_P((
+	void* mem_op,
+	ComponentReference* cr,
+	void* comp ));
+
+typedef void* convert_attr_to_comp_func LDAP_P ((
+        Attribute* a,
+	Syntax* syn,
+        struct berval* bv ));
+
+typedef void* alloc_nibble_func LDAP_P ((
+	int initial_size,
+	int increment_size ));
+
+typedef void free_nibble_func LDAP_P ((
+	void* nm ));
+
+typedef void convert_assert_to_comp_func LDAP_P ((
+	void *mem_op,
+        ComponentSyntaxInfo* csi_attr,
+        struct berval* bv,
+        ComponentSyntaxInfo** csi,
+        int* len,
+        int mode ));
+                                                                          
+typedef int convert_asn_to_ldap_func LDAP_P ((
+        ComponentSyntaxInfo* csi,
+        struct berval *bv ));
+
+typedef void free_component_func LDAP_P ((
+        void* mem_op));
+
+typedef int test_component_func LDAP_P ((
+	void* attr_mem_op,
+	void* assert_mem_op,
+        ComponentSyntaxInfo* csi,
+	ComponentAssertion* ca));
+
+typedef void* test_membership_func LDAP_P ((
+	void* in ));
+
+typedef void* get_component_info_func LDAP_P ((
+	int in ));
+
+typedef int component_encoder_func LDAP_P ((
+	void* mem_op,
+	ComponentSyntaxInfo* csi,
+	struct berval* nvals ));
+	
+typedef int allcomponent_matching_func LDAP_P((
+	char* oid,
+	ComponentSyntaxInfo* comp1,
+	ComponentSyntaxInfo* comp));
+
+struct ComponentDesc {
+	/* Don't change the order of following four fields */
+	int				cd_tag;
+	AttributeType			*cd_comp_type;
+	struct berval			cd_ad_type;	/* ad_type, ad_cname */
+	struct berval			cd_ad_cname;	/* ad_type, ad_cname */
+	unsigned			cd_flags;	/* ad_flags */
+	int				cd_type;
+	int				cd_type_id;
+	encoder_func			*cd_ldap_encoder;
+	encoder_func			*cd_gser_encoder;
+	encoder_func			*cd_ber_encoder;
+	gser_decoder_func		*cd_gser_decoder;
+	ber_decoder_func		*cd_ber_decoder;
+	comp_free_func			*cd_free;
+	extract_component_from_id_func*  cd_extract_i;
+	allcomponent_matching_func	*cd_all_match;
+};
+
+struct ComponentSyntaxInfo {
+	Syntax		*csi_syntax;
+	ComponentDesc	*csi_comp_desc;
+};
+
+#endif /* LDAP_COMP_MATCH */
+
+#ifdef SLAP_ZONE_ALLOC
+#define SLAP_ZONE_SIZE 0x80000		/* 512KB */
+#define SLAP_ZONE_SHIFT 19
+#define SLAP_ZONE_INITSIZE 0x800000 /* 8MB */
+#define SLAP_ZONE_MAXSIZE 0x80000000/* 2GB */
+#define SLAP_ZONE_DELTA 0x800000	/* 8MB */
+#define SLAP_ZONE_ZOBLOCK 256
+
+struct zone_object {
+	void *zo_ptr;
+	int zo_siz;
+	int zo_idx;
+	int zo_blockhead;
+	LDAP_LIST_ENTRY(zone_object) zo_link;
+};
+
+struct zone_latency_history {
+	double zlh_latency;
+	LDAP_STAILQ_ENTRY(zone_latency_history) zlh_next;
+};
+
+struct zone_heap {
+	int zh_fd;
+	int zh_zonesize;
+	int zh_zoneorder;
+	int zh_numzones;
+	int zh_maxzones;
+	int zh_deltazones;
+	void **zh_zones;
+	ldap_pvt_thread_rdwr_t *zh_znlock;
+	Avlnode *zh_zonetree;
+	unsigned char ***zh_maps;
+	int *zh_seqno;
+	LDAP_LIST_HEAD( zh_freelist, zone_object ) *zh_free;
+	LDAP_LIST_HEAD( zh_so, zone_object ) zh_zopool;
+	ldap_pvt_thread_mutex_t zh_mutex;
+	ldap_pvt_thread_rdwr_t zh_lock;
+	double zh_ema_latency;
+	unsigned long zh_ema_samples;
+	LDAP_STAILQ_HEAD( zh_latency_history, zone_latency_history )
+				zh_latency_history_queue;
+	int zh_latency_history_qlen;
+	int zh_latency_jump;
+	int zh_swapping;
+};
+#endif
+
+#define SLAP_BACKEND_INIT_MODULE(b) \
+	static BackendInfo bi;	\
+	int \
+	init_module( int argc, char *argv[] ) \
+	{ \
+		bi.bi_type = #b ; \
+		bi.bi_init = b ## _back_initialize; \
+		backend_add( &bi ); \
+		return 0; \
+	}
+
+typedef int (OV_init)(void);
+typedef struct slap_oinit_t {
+	const char	*ov_type;
+	OV_init		*ov_init;
+} OverlayInit;
+
+LDAP_END_DECL
+
+#include "proto-slap.h"
+
+#endif /* _SLAP_H_ */