/* syncrepl.c -- Replication Engine which uses the LDAP Sync protocol */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 2003-2004 The OpenLDAP Foundation.
 * Portions Copyright 2003 by IBM Corporation.
 * Portions Copyright 2003 by Howard Chu, Symas Corporation.
 * 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>.
 */

#include "portable.h"

#include <stdio.h>

#include <ac/string.h>
#include <ac/socket.h>

#include "lutil.h"
#include "slap.h"
#include "lutil_ldap.h"

#include "ldap_rq.h"

/* FIXME: for ldap_ld_free() */
#undef ldap_debug
#include "../../libraries/libldap/ldap-int.h"

#define SYNCREPL_STR	"syncreplxxx"
#define CN_STR	"cn="

static const struct berval slap_syncrepl_bvc = BER_BVC(SYNCREPL_STR);
static const struct berval slap_syncrepl_cn_bvc = BER_BVC(CN_STR SYNCREPL_STR);

static int syncuuid_cmp( const void *, const void * );
static void avl_ber_bvfree( void * );
static void syncrepl_del_nonpresent( Operation *, syncinfo_t * );

/* callback functions */
static int dn_callback( struct slap_op *, struct slap_rep * );
static int nonpresent_callback( struct slap_op *, struct slap_rep * );
static int null_callback( struct slap_op *, struct slap_rep * );

static AttributeDescription *sync_descs[4];

void
init_syncrepl(syncinfo_t *si)
{
	int i, j, k, l, n;
	char **attrs, **exattrs;

	if ( !sync_descs[0] ) {
		sync_descs[0] = slap_schema.si_ad_objectClass;
		sync_descs[1] = slap_schema.si_ad_structuralObjectClass;
		sync_descs[2] = slap_schema.si_ad_entryCSN;
		sync_descs[3] = NULL;
	}

	if ( si->si_allattrs && si->si_allopattrs )
		attrs = NULL;
	else
		attrs = anlist2attrs( si->si_anlist );

	if ( attrs ) {
		if ( si->si_allattrs ) {
			i = 0;
			while ( attrs[i] ) {
				if ( !is_at_operational( at_find( attrs[i] ))) {
					for ( j = i; attrs[j] != NULL; j++ ) {
						if ( j == i )
							ch_free( attrs[i] );
						attrs[j] = attrs[j+1];
					}
				} else {
					i++;
				}
			}
			attrs = ( char ** ) ch_realloc( attrs, (i + 2)*sizeof( char * ) );
			attrs[i] = ch_strdup("*");
			attrs[i + 1] = NULL;

		} else if ( si->si_allopattrs ) {
			i = 0;
			while ( attrs[i] ) {
				if ( is_at_operational( at_find( attrs[i] ))) {
					for ( j = i; attrs[j] != NULL; j++ ) {
						if ( j == i )
							ch_free( attrs[i] );
						attrs[j] = attrs[j+1];
					}
				} else {
					i++;
				}
			}
			attrs = ( char ** ) ch_realloc( attrs, (i + 2)*sizeof( char * ) );
			attrs[i] = ch_strdup("+");
			attrs[i + 1] = NULL;
		}

		for ( i = 0; sync_descs[i] != NULL; i++ ) {
			j = 0;
			while ( attrs[j] ) {
				if ( !strcmp( attrs[j], sync_descs[i]->ad_cname.bv_val )) {
					for ( k = j; attrs[k] != NULL; k++ ) {
						if ( k == j )
							ch_free( attrs[k] );
						attrs[k] = attrs[k+1];
					}
				} else {
					j++;
				}
			}
		}

		for ( n = 0; attrs[ n ] != NULL; n++ ) /* empty */;

		if ( si->si_allopattrs ) {
			attrs = ( char ** ) ch_realloc( attrs, (n + 2)*sizeof( char * ));
		} else {
			attrs = ( char ** ) ch_realloc( attrs, (n + 4)*sizeof( char * ));
		}

		if ( attrs == NULL ) {
			Debug( LDAP_DEBUG_ANY, "out of memory\n", 0,0,0 );
		}

		/* Add Attributes */
		if ( si->si_allopattrs ) {
			attrs[n++] = ch_strdup( sync_descs[0]->ad_cname.bv_val );
		} else {
			for ( i = 0; sync_descs[ i ] != NULL; i++ ) {
				attrs[ n++ ] = ch_strdup ( sync_descs[i]->ad_cname.bv_val );
			}
		}
		attrs[ n ] = NULL;

	} else {

		i = 0;
		if ( si->si_allattrs == si->si_allopattrs ) {
			attrs = (char**) ch_malloc( 3 * sizeof(char*) );
			attrs[i++] = ch_strdup( "*" );
			attrs[i++] = ch_strdup( "+" );
		} else if ( si->si_allattrs && !si->si_allopattrs ) {
			for ( n = 0; sync_descs[ n ] != NULL; n++ ) ;
			attrs = (char**) ch_malloc( (n+1)* sizeof(char*) );
			attrs[i++] = ch_strdup( "*" );
			for ( j = 1; sync_descs[ j ] != NULL; j++ ) {
				attrs[i++] = ch_strdup ( sync_descs[j]->ad_cname.bv_val );
			}
		} else if ( !si->si_allattrs && si->si_allopattrs ) {
			attrs = (char**) ch_malloc( 3 * sizeof(char*) );
			attrs[i++] = ch_strdup( "+" );
			attrs[i++] = ch_strdup( sync_descs[0]->ad_cname.bv_val );
		}
		attrs[i] = NULL;
	}
	
	si->si_attrs = attrs;

	exattrs = anlist2attrs( si->si_exanlist );

	if ( exattrs ) {
		for ( n = 0; exattrs[n] != NULL; n++ ) ;

		for ( i = 0; sync_descs[i] != NULL; i++ ) {
			j = 0;
			while ( exattrs[j] != NULL ) {
				if ( !strcmp( exattrs[j], sync_descs[i]->ad_cname.bv_val )) {
					for ( k = j; exattrs[k] != NULL; k++ ) {
						if ( k == j )
							ch_free( exattrs[k] );
						exattrs[k] = exattrs[k+1];
					}
				} else {
					j++;
				}
			}
		}

		for ( i = 0; exattrs[i] != NULL; i++ ) {
			for ( j = 0; si->si_anlist[j].an_name.bv_val; j++ ) {
				ObjectClass	*oc;
				if ( ( oc = si->si_anlist[j].an_oc ) ) {
					k = 0;
					while ( oc->soc_required[k] ) {
						if ( !strcmp( exattrs[i],
							 oc->soc_required[k]->sat_cname.bv_val )) {
							for ( l = i; exattrs[l]; l++ ) {
								if ( l == i )
									ch_free( exattrs[i] );
								exattrs[l] = exattrs[l+1];
							}
						} else {
							k++;
						}
					}
				}
			}
		}

		for ( i = 0; exattrs[i] != NULL; i++ ) ;

		if ( i != n )
			exattrs = (char **) ch_realloc( exattrs, (i + 1)*sizeof(char *));
	}

	si->si_exattrs = exattrs;	
}

static int
ldap_sync_search(
	syncinfo_t *si,
	void *ctx )
{
	BerElementBuffer berbuf;
	BerElement *ber = (BerElement *)&berbuf;
	LDAPControl c[2], *ctrls[3];
	struct timeval timeout;
	ber_int_t	msgid;
	int rc;

	/* setup LDAP SYNC control */
	ber_init2( ber, NULL, LBER_USE_DER );
	ber_set_option( ber, LBER_OPT_BER_MEMCTX, &ctx );

	if ( si->si_syncCookie.octet_str &&
		!BER_BVISNULL( &si->si_syncCookie.octet_str[0] ) )
	{
		ber_printf( ber, "{eO}",
			abs(si->si_type),
			&si->si_syncCookie.octet_str[0] );
	} else {
		ber_printf( ber, "{e}",
			abs(si->si_type) );
	}

	if ( (rc = ber_flatten2( ber, &c[0].ldctl_value, 0 )) == LBER_ERROR ) {
		ber_free_buf( ber );
		return rc;
	}

	c[0].ldctl_oid = LDAP_CONTROL_SYNC;
	c[0].ldctl_iscritical = si->si_type < 0;
	ctrls[0] = &c[0];

	if ( si->si_authzId ) {
		c[1].ldctl_oid = LDAP_CONTROL_PROXY_AUTHZ;
		ber_str2bv( si->si_authzId, 0, 0, &c[1].ldctl_value );
		c[1].ldctl_iscritical = 1;
		ctrls[1] = &c[1];
		ctrls[2] = NULL;
	} else {
		ctrls[1] = NULL;
	}

	timeout.tv_sec = si->si_tlimit;
	timeout.tv_usec = 0;

	rc = ldap_search_ext( si->si_ld, si->si_base.bv_val, si->si_scope,
		si->si_filterstr.bv_val, si->si_attrs, si->si_attrsonly,
		ctrls, NULL, si->si_tlimit > 0 ? &timeout : NULL,
		si->si_slimit, &msgid );
	ber_free_buf( ber );
	return rc;
}

static int
do_syncrep1(
	Operation *op,
	syncinfo_t *si )
{
	int	rc;
	int cmdline_cookie_found = 0;

	char syncrepl_cbuf[sizeof(CN_STR SYNCREPL_STR)];
	struct berval syncrepl_cn_bv;
	struct sync_cookie	*sc = NULL;
	struct berval	*psub;
#ifdef HAVE_TLS
	void	*ssl;
#endif

	psub = &si->si_be->be_nsuffix[0];

	/* Init connection to master */
	rc = ldap_initialize( &si->si_ld, si->si_provideruri );
	if ( rc != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_ANY,
			"do_syncrep1: ldap_initialize failed (%s)\n",
			si->si_provideruri, 0, 0 );
		return rc;
	}

	op->o_protocol = LDAP_VERSION3;
	ldap_set_option( si->si_ld, LDAP_OPT_PROTOCOL_VERSION, &op->o_protocol );

	/* Bind to master */

	if ( si->si_tls ) {
		rc = ldap_start_tls_s( si->si_ld, NULL, NULL );
		if( rc != LDAP_SUCCESS ) {
			Debug( LDAP_DEBUG_ANY,
				"%s: ldap_start_tls failed (%d)\n",
				si->si_tls == SYNCINFO_TLS_CRITICAL ? "Error" : "Warning",
				rc, 0 );
			if( si->si_tls == SYNCINFO_TLS_CRITICAL ) goto done;
		}
	}

	if ( si->si_bindmethod == LDAP_AUTH_SASL ) {
#ifdef HAVE_CYRUS_SASL
		void *defaults;

		if ( si->si_secprops != NULL ) {
			rc = ldap_set_option( si->si_ld,
				LDAP_OPT_X_SASL_SECPROPS, si->si_secprops);

			if( rc != LDAP_OPT_SUCCESS ) {
				Debug( LDAP_DEBUG_ANY, "Error: ldap_set_option "
					"(%s,SECPROPS,\"%s\") failed!\n",
					si->si_provideruri, si->si_secprops, 0 );
				goto done;
			}
		}

		defaults = lutil_sasl_defaults( si->si_ld, si->si_saslmech,
			si->si_realm, si->si_authcId, si->si_passwd, si->si_authzId );

		rc = ldap_sasl_interactive_bind_s( si->si_ld,
				si->si_binddn,
				si->si_saslmech,
				NULL, NULL,
				LDAP_SASL_QUIET,
				lutil_sasl_interact,
				defaults );

		lutil_sasl_freedefs( defaults );

		/* FIXME: different error behaviors according to
		 *	1) return code
		 *	2) on err policy : exit, retry, backoff ...
		 */
		if ( rc != LDAP_SUCCESS ) {
			Debug( LDAP_DEBUG_ANY, "do_syncrep1: "
				"ldap_sasl_interactive_bind_s failed (%d)\n",
				rc, 0, 0 );

			/* FIXME (see above comment) */
			/* if Kerberos credentials cache is not active, retry */
			if ( strcmp( si->si_saslmech, "GSSAPI" ) == 0 &&
				rc == LDAP_LOCAL_ERROR )
			{
				rc = LDAP_SERVER_DOWN;
			}

			goto done;
		}
#else /* HAVE_CYRUS_SASL */
		/* Should never get here, we trapped this at config time */
		assert(0);
		fprintf( stderr, "not compiled with SASL support\n" );
		rc = LDAP_OTHER;
		goto done;
#endif

	} else {
		rc = ldap_bind_s( si->si_ld,
			si->si_binddn, si->si_passwd, si->si_bindmethod );
		if ( rc != LDAP_SUCCESS ) {
			Debug( LDAP_DEBUG_ANY, "do_syncrep1: "
				"ldap_bind_s failed (%d)\n", rc, 0, 0 );
			goto done;
		}
	}

	/* Set SSF to strongest of TLS, SASL SSFs */
	op->o_sasl_ssf = 0;
	op->o_tls_ssf = 0;
	op->o_transport_ssf = 0;
#ifdef HAVE_TLS
	if ( ldap_get_option( si->si_ld, LDAP_OPT_X_TLS_SSL_CTX, &ssl )
		== LDAP_SUCCESS && ssl != NULL )
	{
		op->o_tls_ssf = ldap_pvt_tls_get_strength( ssl );
	}
#endif /* HAVE_TLS */
	ldap_get_option( si->si_ld, LDAP_OPT_X_SASL_SSF, &op->o_sasl_ssf );
	op->o_ssf = ( op->o_sasl_ssf > op->o_tls_ssf )
		?  op->o_sasl_ssf : op->o_tls_ssf;

	/* get syncrepl cookie of shadow replica from subentry */
	assert( si->si_rid < 1000 );
	syncrepl_cn_bv.bv_val = syncrepl_cbuf;
	syncrepl_cn_bv.bv_len = snprintf( syncrepl_cbuf, sizeof(syncrepl_cbuf),
		CN_STR "syncrepl%ld", si->si_rid );
	build_new_dn( &op->o_req_ndn, psub, &syncrepl_cn_bv, op->o_tmpmemctx );
	op->o_req_dn = op->o_req_ndn;

	LDAP_STAILQ_FOREACH( sc, &slap_sync_cookie, sc_next ) {
		if ( si->si_rid == sc->rid ) {
			cmdline_cookie_found = 1;
			break;
		}
	}

	if ( cmdline_cookie_found ) {
		/* cookie is supplied in the command line */
		BerVarray cookie = NULL;
		struct berval cookie_bv;

		LDAP_STAILQ_REMOVE( &slap_sync_cookie, sc, sync_cookie, sc_next );
		slap_sync_cookie_free( &si->si_syncCookie, 0 );

		/* read stored cookie if it exists */
		backend_attribute( op, NULL, &op->o_req_ndn,
			slap_schema.si_ad_syncreplCookie, &cookie, ACL_READ );

		if ( !cookie ) {
			/* no stored cookie */
			if ( sc->ctxcsn == NULL ||
				 BER_BVISNULL( sc->ctxcsn ) ) {
				/* if cmdline cookie does not have ctxcsn */
				/* component, set it to an initial value */
				slap_init_sync_cookie_ctxcsn( sc );
			}
			slap_dup_sync_cookie( &si->si_syncCookie, sc );
			slap_sync_cookie_free( sc, 1 );
			sc = NULL;

		} else {
			/* stored cookie */
			struct berval newcookie = BER_BVNULL;
			ber_dupbv( &cookie_bv, &cookie[0] );
			ber_bvarray_add( &si->si_syncCookie.octet_str, &cookie_bv );
			slap_parse_sync_cookie( &si->si_syncCookie );
			ber_bvarray_free( si->si_syncCookie.octet_str );
			si->si_syncCookie.octet_str = NULL;
			ber_bvarray_free_x( cookie, op->o_tmpmemctx );
			if ( sc->sid != -1 ) {
				/* command line cookie wins */
				si->si_syncCookie.sid = sc->sid;
			}
			if ( sc->ctxcsn != NULL ) {
				/* command line cookie wins */
				if ( si->si_syncCookie.ctxcsn ) {
					ber_bvarray_free( si->si_syncCookie.ctxcsn );
					si->si_syncCookie.ctxcsn = NULL;
				}
				ber_dupbv( &cookie_bv, &sc->ctxcsn[0] );
				ber_bvarray_add( &si->si_syncCookie.ctxcsn, &cookie_bv );
			}
			if ( sc->rid != -1 ) {
				/* command line cookie wins */
				si->si_syncCookie.rid = sc->rid;
			}
			slap_sync_cookie_free( sc, 1 );
			sc = NULL;
			slap_compose_sync_cookie( NULL, &newcookie,
					&si->si_syncCookie.ctxcsn[0],
					si->si_syncCookie.sid, si->si_syncCookie.rid );
			ber_bvarray_add( &si->si_syncCookie.octet_str, &newcookie );
		}

	} else {
		/* no command line cookie is specified */
		if ( si->si_syncCookie.octet_str == NULL ) {
			BerVarray cookie = NULL;
			struct berval cookie_bv;
			/* try to read stored cookie */
			backend_attribute( op, NULL, &op->o_req_ndn,
				slap_schema.si_ad_syncreplCookie, &cookie, ACL_READ );
			if ( cookie ) {
				ber_dupbv( &cookie_bv, &cookie[0] );
				ber_bvarray_add( &si->si_syncCookie.octet_str, &cookie_bv );
				slap_parse_sync_cookie( &si->si_syncCookie );
				ber_bvarray_free_x( cookie, op->o_tmpmemctx );
			}
		}
	}

	rc = ldap_sync_search( si, op->o_tmpmemctx );

	if( rc != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_ANY, "do_syncrep1: "
			"ldap_search_ext: %s (%d)\n", ldap_err2string( rc ), rc, 0 );
	}

done:
	if ( rc ) {
		if ( si->si_ld ) {
			ldap_unbind( si->si_ld );
			si->si_ld = NULL;
		}
	}

	slap_sl_free( op->o_req_ndn.bv_val, op->o_tmpmemctx );

	return rc;
}

static int
do_syncrep2(
	Operation *op,
	syncinfo_t *si )
{
	LDAPControl	**rctrls = NULL;
	LDAPControl	*rctrlp;

	BerElementBuffer berbuf;
	BerElement	*ber = (BerElement *)&berbuf;

	LDAPMessage	*res = NULL;
	LDAPMessage	*msg = NULL;

	char		*retoid = NULL;
	struct berval	*retdata = NULL;

	Entry		*entry = NULL;

	int		syncstate;
	struct berval	syncUUID = BER_BVNULL;
	struct sync_cookie	syncCookie = { NULL, -1, NULL };
	struct sync_cookie	syncCookie_req = { NULL, -1, NULL };
	struct berval		cookie = BER_BVNULL;

	int	rc, err, i;
	ber_len_t	len;

	int rc_efree = 1;

	struct berval	*psub;
	Modifications	*modlist = NULL;

	const char		*text;
	int				match;

	struct timeval *tout_p = NULL;
	struct timeval tout = { 0, 0 };

	int		refreshDeletes = 0;
	int		refreshDone = 1;
	BerVarray syncUUIDs = NULL;
	ber_tag_t si_tag;

	if ( slapd_shutdown ) {
		rc = -2;
		goto done;
	}

	ber_init2( ber, NULL, LBER_USE_DER );
	ber_set_option( ber, LBER_OPT_BER_MEMCTX, &op->o_tmpmemctx );

	Debug( LDAP_DEBUG_TRACE, "=>do_syncrep2\n", 0, 0, 0 );

	psub = &si->si_be->be_nsuffix[0];

	slap_dup_sync_cookie( &syncCookie_req, &si->si_syncCookie );

	if ( abs(si->si_type) == LDAP_SYNC_REFRESH_AND_PERSIST ) {
		tout_p = &tout;
	} else {
		tout_p = NULL;
	}

	while (( rc = ldap_result( si->si_ld, LDAP_RES_ANY, LDAP_MSG_ONE,
		tout_p, &res )) > 0 )
	{
		if ( slapd_shutdown ) {
			rc = -2;
			goto done;
		}
		for( msg = ldap_first_message( si->si_ld, res );
			msg != NULL;
			msg = ldap_next_message( si->si_ld, msg ) )
		{
			switch( ldap_msgtype( msg ) ) {
			case LDAP_RES_SEARCH_ENTRY:
				ldap_get_entry_controls( si->si_ld, msg, &rctrls );
				/* we can't work without the control */
				if ( !rctrls ) {
					Debug( LDAP_DEBUG_ANY, "do_syncrep2: "
						"got search entry without "
						"control\n", 0, 0, 0 );
					rc = -1;
					goto done;
				}
				rctrlp = *rctrls;
				ber_init2( ber, &rctrlp->ldctl_value, LBER_USE_DER );
				ber_scanf( ber, "{em" /*"}"*/, &syncstate, &syncUUID );
				if ( ber_peek_tag( ber, &len ) == LDAP_TAG_SYNC_COOKIE ) {
					ber_scanf( ber, /*"{"*/ "m}", &cookie );
					if ( !BER_BVISNULL( &cookie ) ) {
						struct berval tmp_bv;
						ber_dupbv( &tmp_bv, &cookie );
						ber_bvarray_add( &syncCookie.octet_str, &tmp_bv );
					}
					if ( syncCookie.octet_str &&
							!BER_BVISNULL( &syncCookie.octet_str[0] ) )
					{
						slap_parse_sync_cookie( &syncCookie );
					}
				}
				if ( syncrepl_message_to_entry( si, op, msg,
					&modlist, &entry, syncstate ) == LDAP_SUCCESS ) {
					rc_efree = syncrepl_entry( si, op, entry, &modlist,
						syncstate, &syncUUID, &syncCookie_req, syncCookie.ctxcsn );
					if ( syncCookie.octet_str &&
						!BER_BVISNULL( &syncCookie.octet_str[0] ) )
					{
						syncrepl_updateCookie( si, op, psub, &syncCookie );
					}
				}
				ldap_controls_free( rctrls );
				if ( modlist ) {
					slap_mods_free( modlist );
				}
				if ( rc_efree && entry ) {
					entry_free( entry );
				}
				entry = NULL;
				break;

			case LDAP_RES_SEARCH_REFERENCE:
				Debug( LDAP_DEBUG_ANY,
					"do_syncrep2: reference received error\n", 0, 0, 0 );
				break;

			case LDAP_RES_SEARCH_RESULT:
				Debug( LDAP_DEBUG_SYNC,
					"do_syncrep2: LDAP_RES_SEARCH_RESULT\n", 0, 0, 0 );
				ldap_parse_result( si->si_ld, msg, &err, NULL, NULL, NULL,
					&rctrls, 0 );
				if ( rctrls ) {
					rctrlp = *rctrls;
					ber_init2( ber, &rctrlp->ldctl_value, LBER_USE_DER );

					ber_scanf( ber, "{" /*"}"*/);
					if ( ber_peek_tag( ber, &len ) == LDAP_TAG_SYNC_COOKIE ) {
						ber_scanf( ber, "m", &cookie );
						if ( !BER_BVISNULL( &cookie ) ) {
							struct berval tmp_bv;
							ber_dupbv( &tmp_bv, &cookie );
							ber_bvarray_add( &syncCookie.octet_str, &tmp_bv);
						}
						if ( syncCookie.octet_str &&
							!BER_BVISNULL( &syncCookie.octet_str[0] ) )
						{
							slap_parse_sync_cookie( &syncCookie );
						}
					}
					if ( ber_peek_tag( ber, &len ) == LDAP_TAG_REFRESHDELETES )
					{
						ber_scanf( ber, "b", &refreshDeletes );
					}
					ber_scanf( ber, /*"{"*/ "}" );
				}
				if ( syncCookie_req.ctxcsn == NULL ) {
					match = -1;
				} else if ( syncCookie.ctxcsn == NULL ) {
					match = 1;
				} else {
					value_match( &match, slap_schema.si_ad_entryCSN,
						slap_schema.si_ad_entryCSN->ad_type->sat_ordering,
						SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
						&syncCookie_req.ctxcsn[0], &syncCookie.ctxcsn[0],
						&text );
				}
				if ( syncCookie.octet_str && !BER_BVISNULL( syncCookie.octet_str ) &&
					match < 0 && err == LDAP_SUCCESS )
				{
					syncrepl_updateCookie( si, op, psub, &syncCookie );
				}
				if ( rctrls ) {
					ldap_controls_free( rctrls );
				}
				if (si->si_type != LDAP_SYNC_REFRESH_AND_PERSIST) {
					/* FIXME : different error behaviors according to
					 *	1) err code : LDAP_BUSY ...
					 *	2) on err policy : stop service, stop sync, retry
					 */
					if ( refreshDeletes == 0 && match < 0 &&
						err == LDAP_SUCCESS )
					{
						syncrepl_del_nonpresent( op, si );
					} else {
						avl_free( si->si_presentlist, avl_ber_bvfree );
						si->si_presentlist = NULL;
					}
				}
				rc = -2;
				goto done;
				break;

			case LDAP_RES_INTERMEDIATE:
				rc = ldap_parse_intermediate( si->si_ld, msg,
					&retoid, &retdata, NULL, 0 );
				if ( !rc && !strcmp( retoid, LDAP_SYNC_INFO ) ) {
					ber_init2( ber, retdata, LBER_USE_DER );

					switch ( si_tag = ber_peek_tag( ber, &len )) {
					ber_tag_t tag;
					case LDAP_TAG_SYNC_NEW_COOKIE:
						Debug( LDAP_DEBUG_SYNC,
							"do_syncrep2: %s - %s%s\n", 
							"LDAP_RES_INTERMEDIATE", 
							"NEW_COOKIE", "\n" );
						ber_scanf( ber, "tm", &tag, &cookie );
						break;
					case LDAP_TAG_SYNC_REFRESH_DELETE:
						Debug( LDAP_DEBUG_SYNC,
							"do_syncrep2: %s - %s%s\n", 
							"LDAP_RES_INTERMEDIATE", 
							"REFRESH_DELETE\n", "\n" );
						si->si_refreshDelete = 1;
					case LDAP_TAG_SYNC_REFRESH_PRESENT:
						Debug( LDAP_DEBUG_SYNC,
							"do_syncrep2: %s - %s%s\n", 
							"LDAP_RES_INTERMEDIATE", 
							si_tag == LDAP_TAG_SYNC_REFRESH_PRESENT ?
							"REFRESH_PRESENT" : "REFRESH_DELETE",
							"\n" );
						si->si_refreshDelete = 1;
						si->si_refreshPresent = 1;
						ber_scanf( ber, "t{" /*"}"*/, &tag );
						if ( ber_peek_tag( ber, &len ) == LDAP_TAG_SYNC_COOKIE )
						{
							ber_scanf( ber, "m", &cookie );
							if ( !BER_BVISNULL( &cookie ) ) {
								struct berval tmp_bv;
								ber_dupbv( &tmp_bv, &cookie );
								ber_bvarray_add( &syncCookie.octet_str,
									&tmp_bv);
							}
							if ( syncCookie.octet_str &&
								!BER_BVISNULL( &syncCookie.octet_str[0] ) )
							{
								slap_parse_sync_cookie( &syncCookie );
							}
						}
						if ( ber_peek_tag( ber, &len ) ==
							LDAP_TAG_REFRESHDONE )
						{
							ber_scanf( ber, "b", &refreshDone );
						}
						ber_scanf( ber, /*"{"*/ "}" );
						break;
					case LDAP_TAG_SYNC_ID_SET:
						Debug( LDAP_DEBUG_SYNC,
							"do_syncrep2: %s - %s%s\n", 
							"LDAP_RES_INTERMEDIATE", 
							"SYNC_ID_SET",
							"\n" );
						ber_scanf( ber, "t{" /*"}"*/, &tag );
						if ( ber_peek_tag( ber, &len ) ==
							LDAP_TAG_SYNC_COOKIE )
						{
							ber_scanf( ber, "m", &cookie );
							if ( !BER_BVISNULL( &cookie ) ) {
								struct berval tmp_bv;
								ber_dupbv( &tmp_bv, &cookie );
								ber_bvarray_add( &syncCookie.octet_str,
									&tmp_bv );
							}
							if ( syncCookie.octet_str &&
									!BER_BVISNULL( &syncCookie.octet_str[0] ) )
							{
								slap_parse_sync_cookie( &syncCookie );
							}
						}
						if ( ber_peek_tag( ber, &len ) ==
							LDAP_TAG_REFRESHDELETES )
						{
							ber_scanf( ber, "b", &refreshDeletes );
						}
						ber_scanf( ber, "[W]", &syncUUIDs );
						ber_scanf( ber, /*"{"*/ "}" );
						for ( i = 0; !BER_BVISNULL( &syncUUIDs[i] ); i++ ) {
							struct berval *syncuuid_bv;
							syncuuid_bv = ber_dupbv( NULL, &syncUUIDs[i] );
							slap_sl_free( syncUUIDs[i].bv_val,op->o_tmpmemctx );
							avl_insert( &si->si_presentlist,
								(caddr_t) syncuuid_bv,
								syncuuid_cmp, avl_dup_error );
						}
						slap_sl_free( syncUUIDs, op->o_tmpmemctx );
						break;
					default:
						Debug( LDAP_DEBUG_ANY,
							"do_syncrep2 : unknown syncinfo tag (%ld)\n",
						(long) si_tag, 0, 0 );
						ldap_memfree( retoid );
						ber_bvfree( retdata );
						continue;
					}

					if ( syncCookie_req.ctxcsn == NULL ) {
						match = -1;
					} else if ( syncCookie.ctxcsn == NULL ) {
						match = 1;
					} else {
						value_match( &match, slap_schema.si_ad_entryCSN,
							slap_schema.si_ad_entryCSN->ad_type->sat_ordering,
							SLAP_MR_VALUE_OF_ATTRIBUTE_SYNTAX,
							&syncCookie_req.ctxcsn[0],
							&syncCookie.ctxcsn[0], &text );
					}

					if ( syncCookie.ctxcsn && !BER_BVISNULL( &syncCookie.ctxcsn[0] ) &&
						match < 0 )
					{
						syncrepl_updateCookie( si, op, psub, &syncCookie);
					}

					if ( si->si_refreshPresent == 1 ) {
						if ( match < 0 ) {
							syncrepl_del_nonpresent( op, si );
						}
					} 

					ldap_memfree( retoid );
					ber_bvfree( retdata );
					break;

				} else {
					Debug( LDAP_DEBUG_ANY, "do_syncrep2 : "
						"unknown intermediate response (%d)\n",
						rc, 0, 0 );
					ldap_memfree( retoid );
					ber_bvfree( retdata );
					break;
				}
				break;

			default:
				Debug( LDAP_DEBUG_ANY, "do_syncrep2 : "
					"unknown message\n", 0, 0, 0 );
				break;

			}
			if ( syncCookie.octet_str ) {
				slap_sync_cookie_free( &syncCookie_req, 0 );
				slap_dup_sync_cookie( &syncCookie_req, &syncCookie );
				slap_sync_cookie_free( &syncCookie, 0 );
			}
		}
		ldap_msgfree( res );
		res = NULL;
	}

	if ( rc == -1 ) {
		const char *errstr;

		ldap_get_option( si->si_ld, LDAP_OPT_ERROR_NUMBER, &rc );
		errstr = ldap_err2string( rc );
		
		Debug( LDAP_DEBUG_ANY,
			"do_syncrep2 : %s\n", errstr, 0, 0 );
	}

done:
	slap_sync_cookie_free( &syncCookie, 0 );
	slap_sync_cookie_free( &syncCookie_req, 0 );

	if ( res ) ldap_msgfree( res );

	if ( rc && si->si_ld ) {
		ldap_unbind( si->si_ld );
		si->si_ld = NULL;
	}

	return rc;
}

void *
do_syncrepl(
	void	*ctx,
	void	*arg )
{
	struct re_s* rtask = arg;
	syncinfo_t *si = ( syncinfo_t * ) rtask->arg;
	Connection conn = {0};
	char opbuf[OPERATION_BUFFER_SIZE];
	Operation *op;
	int rc = LDAP_SUCCESS;
	int first = 0;
	int dostop = 0;
	ber_socket_t s;
	int i, defer = 1;
	Backend *be;

	Debug( LDAP_DEBUG_TRACE, "=>do_syncrepl\n", 0, 0, 0 );

	if ( si == NULL )
		return NULL;

	switch( abs( si->si_type )) {
	case LDAP_SYNC_REFRESH_ONLY:
	case LDAP_SYNC_REFRESH_AND_PERSIST:
		break;
	default:
		return NULL;
	}

	if ( slapd_shutdown && si->si_ld ) {
		ldap_get_option( si->si_ld, LDAP_OPT_DESC, &s );
		connection_client_stop( s );
		ldap_unbind( si->si_ld );
		si->si_ld = NULL;
		return NULL;
	}

	op = (Operation *)opbuf;
	connection_fake_init( &conn, op, ctx );

	/* use global malloc for now */
	op->o_tmpmemctx = NULL;
	op->o_tmpmfuncs = &ch_mfuncs;

	op->o_dn = si->si_updatedn;
	op->o_ndn = si->si_updatedn;
	op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
	op->o_bd = be = si->si_be;

	/* Establish session, do search */
	if ( !si->si_ld ) {
		first = 1;
		si->si_refreshDelete = 0;
		si->si_refreshPresent = 0;
		rc = do_syncrep1( op, si );
	}

	/* Process results */
	if ( rc == LDAP_SUCCESS ) {
		ldap_get_option( si->si_ld, LDAP_OPT_DESC, &s );

		rc = do_syncrep2( op, si );

		if ( abs(si->si_type) == LDAP_SYNC_REFRESH_AND_PERSIST ) {
			/* If we succeeded, enable the connection for further listening.
			 * If we failed, tear down the connection and reschedule.
			 */
			if ( rc == LDAP_SUCCESS ) {
				if ( first ) {
					rc = connection_client_setup( s, do_syncrepl, arg );
				} else {
					connection_client_enable( s );
				} 
			} else if ( !first ) {
				dostop = 1;
			}
		} else {
			if ( rc == -2 ) rc = 0;
		}
	}

	/* At this point, we have 4 cases:
	 * 1) for any hard failure, give up and remove this task
	 * 2) for ServerDown, reschedule this task to run
	 * 3) for Refresh and Success, reschedule to run
	 * 4) for Persist and Success, reschedule to defer
	 */
	ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );

	if ( ldap_pvt_runqueue_isrunning( &slapd_rq, rtask )) {
		ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
	}

	if ( dostop ) {
		connection_client_stop( s );
	}

	if ( rc == LDAP_SUCCESS ) {
		if ( si->si_type == LDAP_SYNC_REFRESH_ONLY ) {
			defer = 0;
		}
		rtask->interval.tv_sec = si->si_interval;
		ldap_pvt_runqueue_resched( &slapd_rq, rtask, defer );
		if ( si->si_retrynum ) {
			for ( i = 0; si->si_retrynum_init[i] != -2; i++ ) {
				si->si_retrynum[i] = si->si_retrynum_init[i];
			}
			si->si_retrynum[i] = -2;
		}
	} else {
		for ( i = 0; si->si_retrynum && si->si_retrynum[i] <= 0; i++ ) {
			if ( si->si_retrynum[i] == -1  || si->si_retrynum[i] == -2 )
				break;
		}

		if ( !si->si_retrynum || si->si_retrynum[i] == -2 ) {
			ldap_pvt_runqueue_remove( &slapd_rq, rtask );
			LDAP_STAILQ_REMOVE( &be->be_syncinfo, si, syncinfo_s, si_next );
			syncinfo_free( si );
		} else if ( si->si_retrynum[i] >= -1 ) {
			if ( si->si_retrynum[i] > 0 )
				si->si_retrynum[i]--;
			rtask->interval.tv_sec = si->si_retryinterval[i];
			ldap_pvt_runqueue_resched( &slapd_rq, rtask, 0 );
			slap_wake_listener();
		}
	}
	
	ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );

	return NULL;
}

int
syncrepl_message_to_entry(
	syncinfo_t	*si,
	Operation	*op,
	LDAPMessage	*msg,
	Modifications	**modlist,
	Entry			**entry,
	int		syncstate
)
{
	Entry		*e = NULL;
	BerElement	*ber = NULL;
	Modifications	tmp;
	Modifications	*mod;
	Modifications	**modtail = modlist;

	const char	*text;
	char txtbuf[SLAP_TEXT_BUFLEN];
	size_t textlen = sizeof txtbuf;

	struct berval	bdn = {0, NULL}, dn, ndn;
	int		rc;

	*modlist = NULL;

	if ( ldap_msgtype( msg ) != LDAP_RES_SEARCH_ENTRY ) {
		Debug( LDAP_DEBUG_ANY,
			"Message type should be entry (%d)", ldap_msgtype( msg ), 0, 0 );
		return -1;
	}

	op->o_tag = LDAP_REQ_ADD;

	rc = ldap_get_dn_ber( si->si_ld, msg, &ber, &bdn );

	if ( rc != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_ANY,
			"syncrepl_message_to_entry : dn get failed (%d)", rc, 0, 0 );
		return rc;
	}

	dnPrettyNormal( NULL, &bdn, &dn, &ndn, op->o_tmpmemctx );
	ber_dupbv( &op->o_req_dn, &dn );
	ber_dupbv( &op->o_req_ndn, &ndn );
	slap_sl_free( ndn.bv_val, op->o_tmpmemctx );
	slap_sl_free( dn.bv_val, op->o_tmpmemctx );

	if ( syncstate == LDAP_SYNC_PRESENT || syncstate == LDAP_SYNC_DELETE ) {
		if ( entry )
			*entry = NULL;
		return LDAP_SUCCESS;
	}

	if ( entry == NULL ) {
		return -1;
	}

	e = ( Entry * ) ch_calloc( 1, sizeof( Entry ) );
	*entry = e;
	e->e_name = op->o_req_dn;
	e->e_nname = op->o_req_ndn;

	while ( ber_remaining( ber ) ) {
		if ( (ber_scanf( ber, "{mW}", &tmp.sml_type, &tmp.sml_values ) ==
			LBER_ERROR ) || BER_BVISNULL( &tmp.sml_type ) )
		{
			break;
		}

		mod  = (Modifications *) ch_malloc( sizeof( Modifications ));

		mod->sml_op = LDAP_MOD_REPLACE;
		mod->sml_next = NULL;
		mod->sml_desc = NULL;
		mod->sml_type = tmp.sml_type;
		mod->sml_values = tmp.sml_values;
		mod->sml_nvalues = NULL;

		*modtail = mod;
		modtail = &mod->sml_next;
	}

	if ( *modlist == NULL ) {
		Debug( LDAP_DEBUG_ANY, "syncrepl_message_to_entry: no attributes\n",
			0, 0, 0 );
		rc = -1;
		goto done;
	}

	rc = slap_mods_check( *modlist, 1, &text, txtbuf, textlen, NULL );

	if ( rc != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_ANY, "syncrepl_message_to_entry: mods check (%s)\n",
			text, 0, 0 );
		goto done;
	}

	/* Strip out dynamically generated attrs */
	for ( modtail = modlist; *modtail ; ) {
		mod = *modtail;
		if ( mod->sml_desc->ad_type->sat_flags & SLAP_AT_DYNAMIC ) {
			*modtail = mod->sml_next;
			slap_mod_free( &mod->sml_mod, 0 );
			ch_free( mod );
		} else {
			modtail = &mod->sml_next;
		}
	}

	/* Strip out attrs in exattrs list */
	for ( modtail = modlist; *modtail ; ) {
		mod = *modtail;
		if ( ldap_charray_inlist( si->si_exattrs,
					mod->sml_desc->ad_type->sat_cname.bv_val )) {
			*modtail = mod->sml_next;
			slap_mod_free( &mod->sml_mod, 0 );
			ch_free( mod );
		} else {
			modtail = &mod->sml_next;
		}
	}
	
	rc = slap_mods2entry( *modlist, &e, 1, 1, &text, txtbuf, textlen);
	if( rc != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_ANY, "syncrepl_message_to_entry: mods2entry (%s)\n",
			text, 0, 0 );
	}

done:
	ber_free ( ber, 0 );
	if ( rc != LDAP_SUCCESS ) {
		if ( e ) {
			entry_free( e );
			*entry = e = NULL;
		}
	}

	return rc;
}

/* During a refresh, we may get an LDAP_SYNC_ADD for an already existing
 * entry if a previous refresh was interrupted before sending us a new
 * context state. We try to compare the new entry to the existing entry
 * and ignore the new entry if they are the same.
 *
 * Also, we may get an update where the entryDN has changed, due to
 * a ModDn on the provider. We detect this as well, so we can issue
 * the corresponding operation locally.
 *
 * In the case of a modify, we get a list of all the attributes
 * in the original entry. Rather than deleting the entry and re-adding it,
 * we issue a Modify request that deletes all the attributes and adds all
 * the new ones. This avoids the issue of trying to delete/add a non-leaf
 * entry.
 *
 * We don't try to otherwise distinguish ModDN from Modify; in the case of
 * a ModDN we will issue both operations on the local database.
 */
typedef struct dninfo {
	Entry *new_entry;
	struct berval dn;
	struct berval ndn;
	int renamed;	/* Was an existing entry renamed? */
	int wasChanged;	/* are the attributes changed? */
	int attrs;		/* how many attribute types are in the ads list */
	AttributeDescription **ads;
} dninfo;

int
syncrepl_entry(
	syncinfo_t* si,
	Operation *op,
	Entry* entry,
	Modifications** modlist,
	int syncstate,
	struct berval* syncUUID,
	struct sync_cookie* syncCookie_req,
	struct berval* syncCSN )
{
	Backend *be = op->o_bd;
	slap_callback	cb = { NULL };
	struct berval	*syncuuid_bv = NULL;
	struct berval	syncUUID_strrep = BER_BVNULL;
	struct berval	uuid_bv = BER_BVNULL;

	SlapReply	rs_search = {REP_RESULT};
	SlapReply	rs_delete = {REP_RESULT};
	SlapReply	rs_add = {REP_RESULT};
	SlapReply	rs_modify = {REP_RESULT};
	Filter f = {0};
	AttributeAssertion ava = {0};
	int rc = LDAP_SUCCESS;
	int ret = LDAP_SUCCESS;

	struct berval pdn = BER_BVNULL;
	struct berval org_req_dn = BER_BVNULL;
	struct berval org_req_ndn = BER_BVNULL;
	struct berval org_dn = BER_BVNULL;
	struct berval org_ndn = BER_BVNULL;
	int	org_managedsait;
	dninfo dni = {0};
	int	retry = 1;

	switch( syncstate ) {
	case LDAP_SYNC_PRESENT:
		Debug( LDAP_DEBUG_SYNC, "%s: %s\n",
					"syncrepl_entry",
					"LDAP_RES_SEARCH_ENTRY(LDAP_SYNC_PRESENT)", 0 );
		break;
	case LDAP_SYNC_ADD:
		Debug( LDAP_DEBUG_SYNC, "%s: %s\n",
					"syncrepl_entry",
					"LDAP_RES_SEARCH_ENTRY(LDAP_SYNC_ADD)", 0 );
		break;
	case LDAP_SYNC_DELETE:
		Debug( LDAP_DEBUG_SYNC, "%s: %s\n",
					"syncrepl_entry",
					"LDAP_RES_SEARCH_ENTRY(LDAP_SYNC_DELETE)", 0 );
		break;
	case LDAP_SYNC_MODIFY:
		Debug( LDAP_DEBUG_SYNC, "%s: %s\n",
					"syncrepl_entry",
					"LDAP_RES_SEARCH_ENTRY(LDAP_SYNC_MODIFY)", 0 );
		break;
	default:
		Debug( LDAP_DEBUG_ANY, "%s: %s\n",
					"syncrepl_entry",
					"LDAP_RES_SEARCH_ENTRY(UNKNOWN syncstate)", 0 );
	}

	if (( syncstate == LDAP_SYNC_PRESENT || syncstate == LDAP_SYNC_ADD )) {
		if ( !si->si_refreshPresent ) {
			syncuuid_bv = ber_dupbv( NULL, syncUUID );
			avl_insert( &si->si_presentlist, (caddr_t) syncuuid_bv,
				syncuuid_cmp, avl_dup_error );
		}
	}

	if ( syncstate == LDAP_SYNC_PRESENT ) {
		return 0;
	} else if ( syncstate != LDAP_SYNC_DELETE ) {
		if ( entry == NULL ) {
			return 0;
		}
	}

	f.f_choice = LDAP_FILTER_EQUALITY;
	f.f_ava = &ava;
	ava.aa_desc = slap_schema.si_ad_entryUUID;
	(void)slap_uuidstr_from_normalized( &syncUUID_strrep, syncUUID, op->o_tmpmemctx );
	ava.aa_value = *syncUUID;
	op->ors_filter = &f;

	op->ors_filterstr.bv_len = STRLENOF( "entryUUID=" ) + syncUUID->bv_len;
	op->ors_filterstr.bv_val = (char *) slap_sl_malloc(
		op->ors_filterstr.bv_len + 1, op->o_tmpmemctx ); 
	AC_MEMCPY( op->ors_filterstr.bv_val, "entryUUID=", STRLENOF( "entryUUID=" ) );
	AC_MEMCPY( &op->ors_filterstr.bv_val[STRLENOF( "entryUUID=" )],
		syncUUID->bv_val, syncUUID->bv_len );
	op->ors_filterstr.bv_val[op->ors_filterstr.bv_len] = '\0';

	op->o_tag = LDAP_REQ_SEARCH;
	op->ors_scope = LDAP_SCOPE_SUBTREE;

	/* get the entry for this UUID */
	op->o_req_dn = si->si_base;
	op->o_req_ndn = si->si_base;

	op->o_time = slap_get_time();
	op->ors_tlimit = SLAP_NO_LIMIT;
	op->ors_slimit = 1;

	op->ors_attrs = slap_anlist_all_attributes;
	op->ors_attrsonly = 0;

	/* set callback function */
	op->o_callback = &cb;
	cb.sc_response = dn_callback;
	cb.sc_private = &dni;
	dni.new_entry = entry;

	if ( limits_check( op, &rs_search ) == 0 ) {
		rc = be->be_search( op, &rs_search );
		Debug( LDAP_DEBUG_SYNC,
				"syncrepl_entry: %s (%d)\n", 
				"be_search", rc, 0 );
	}

	if ( !BER_BVISNULL( &op->ors_filterstr ) ) {
		slap_sl_free( op->ors_filterstr.bv_val, op->o_tmpmemctx );
	}

	cb.sc_response = null_callback;
	cb.sc_private = si;

	if ( entry && entry->e_name.bv_val ) {
		Debug( LDAP_DEBUG_SYNC,
				"syncrepl_entry: %s\n",
				entry->e_name.bv_val, 0, 0 );
	} else {
		Debug( LDAP_DEBUG_SYNC,
				"syncrepl_entry: %s\n",
				dni.dn.bv_val ? dni.dn.bv_val : "(null)", 0, 0 );
	}

	org_req_dn = op->o_req_dn;
	org_req_ndn = op->o_req_ndn;
	org_dn = op->o_dn;
	org_ndn = op->o_ndn;
	org_managedsait = get_manageDSAit( op );
	op->o_dn = op->o_bd->be_rootdn;
	op->o_ndn = op->o_bd->be_rootndn;
	op->o_managedsait = SLAP_CONTROL_NONCRITICAL;

	if ( syncstate != LDAP_SYNC_DELETE ) {
		attr_delete( &entry->e_attrs, slap_schema.si_ad_entryUUID );
		attr_merge_one( entry, slap_schema.si_ad_entryUUID,
			&syncUUID_strrep, syncUUID );
	}

	switch ( syncstate ) {
	case LDAP_SYNC_ADD:
	case LDAP_SYNC_MODIFY:
retry_add:;
		if ( BER_BVISNULL( &dni.dn )) {

			op->o_req_dn = entry->e_name;
			op->o_req_ndn = entry->e_nname;
			op->o_tag = LDAP_REQ_ADD;
			op->ora_e = entry;

			rc = be->be_add( op, &rs_add );
			Debug( LDAP_DEBUG_SYNC,
					"syncrepl_entry: %s (%d)\n", 
					"be_add", rc, 0 );
			switch ( rs_add.sr_err ) {
			case LDAP_SUCCESS:
				be_entry_release_w( op, entry );
				ret = 0;
				break;

			case LDAP_REFERRAL:
			/* we assume that LDAP_NO_SUCH_OBJECT is returned 
			 * only if the suffix entry is not present */
			case LDAP_NO_SUCH_OBJECT:
				syncrepl_add_glue( op, entry );
				ret = 0;
				break;

			/* if an entry was added via syncrepl_add_glue(),
			 * it likely has no entryUUID, so the previous
			 * be_search() doesn't find it.  In this case,
			 * give syncrepl a chance to modify it. */
			case LDAP_ALREADY_EXISTS:
				if ( retry ) {
					Operation	op2 = *op;
					SlapReply	rs2 = { 0 };
					slap_callback	cb2 = { 0 };

					op2.o_tag = LDAP_REQ_SEARCH;
					ber_dupbv_x( &op2.o_req_dn,
						&entry->e_name,
						op2.o_tmpmemctx );
					ber_dupbv_x( &op2.o_req_ndn,
						&entry->e_nname,
						op2.o_tmpmemctx );
					op2.ors_scope = LDAP_SCOPE_BASE;
					op2.ors_attrs = slap_anlist_all_attributes;
					op2.ors_attrsonly = 0;
					op2.ors_limit = NULL;
					op2.ors_slimit = 1;
					op2.ors_tlimit = SLAP_NO_LIMIT;

					f.f_choice = LDAP_FILTER_EQUALITY;
					f.f_ava = &ava;
					ava.aa_desc = slap_schema.si_ad_objectClass;
					ber_dupbv_x( &ava.aa_value,
						&slap_schema.si_oc_glue->soc_cname,
						op2.o_tmpmemctx );
					op2.ors_filter = &f;
					filter2bv_x( &op2, op2.ors_filter,
							&op2.ors_filterstr );

					op2.o_callback = &cb2;
					cb2.sc_response = dn_callback;
					cb2.sc_private = &dni;

					be->be_search( &op2, &rs2 );

					op2.o_tmpfree( op2.o_req_dn.bv_val,
						op2.o_tmpmemctx );
					op2.o_tmpfree( op2.o_req_ndn.bv_val,
						op2.o_tmpmemctx );
					op2.o_tmpfree( ava.aa_value.bv_val,
						op2.o_tmpmemctx );
					op2.o_tmpfree( op2.ors_filterstr.bv_val,
						op2.o_tmpmemctx );

					retry = 0;
					goto retry_add;
				}
				/* FALLTHRU */

			default:
				Debug( LDAP_DEBUG_ANY,
					"syncrepl_entry : be_add failed (%d)\n",
					rs_add.sr_err, 0, 0 );
				ret = 1;
				break;
			}
			goto done;
		}
		/* FALLTHRU */
		op->o_req_dn = dni.dn;
		op->o_req_ndn = dni.ndn;
		if ( dni.renamed ) {
			struct berval noldp, newp, nnewp;

			op->o_tag = LDAP_REQ_MODRDN;
			dnRdn( &entry->e_name, &op->orr_newrdn );
			dnRdn( &entry->e_nname, &op->orr_nnewrdn );

			dnParent( &dni.ndn, &noldp );
			dnParent( &entry->e_nname, &nnewp );
			if ( !dn_match( &noldp, &newp )) {
				dnParent( &entry->e_name, &newp );
				op->orr_newSup = &newp;
				op->orr_nnewSup = &nnewp;
			}
			op->orr_deleteoldrdn = 0;
			rc = be->be_modrdn( op, &rs_modify );
			Debug( LDAP_DEBUG_SYNC,
					"syncrepl_entry: %s (%d)\n", 
					"be_modrdn", rc, 0 );
			if ( rs_modify.sr_err == LDAP_SUCCESS ) {
				op->o_req_dn = entry->e_name;
				op->o_req_ndn = entry->e_nname;
			} else {
				ret = 1;
				goto done;
			}
		}
		if ( dni.wasChanged ) {
			Modifications *mod, *modhead = NULL;
			Modifications *modtail = NULL;
			int i;

			op->o_tag = LDAP_REQ_MODIFY;

			assert( *modlist );

			/* Delete all the old attrs */
			for ( i=0; i<dni.attrs; i++) {
				mod = ch_malloc( sizeof(Modifications));
				mod->sml_op = LDAP_MOD_DELETE;
				mod->sml_desc = dni.ads[i];
				mod->sml_type =mod->sml_desc->ad_cname;
				mod->sml_values = NULL;
				mod->sml_nvalues = NULL;
				if ( !modhead ) modhead = mod;
				if ( modtail ) {
					modtail->sml_next = mod;
				}
				modtail = mod;
			}

			/* Append passed in list to ours */
			if ( modtail ) {
				modtail->sml_next = *modlist;
				*modlist = modhead;
			} else {
				mod = *modlist;
			}

			/* Find end of this list */
			for ( ; mod != NULL; mod = mod->sml_next ) {
				modtail = mod;
			}

			mod = (Modifications *)ch_calloc(1, sizeof(Modifications));
			mod->sml_op = LDAP_MOD_REPLACE;
			mod->sml_desc = slap_schema.si_ad_entryUUID;
			mod->sml_type = mod->sml_desc->ad_cname;
			ber_dupbv( &uuid_bv, &syncUUID_strrep );
			ber_bvarray_add( &mod->sml_values, &uuid_bv );
			ber_dupbv( &uuid_bv, syncUUID );
			ber_bvarray_add( &mod->sml_nvalues, &uuid_bv );
			modtail->sml_next = mod;
					
			op->o_tag = LDAP_REQ_MODIFY;
			op->orm_modlist = *modlist;

			rc = be->be_modify( op, &rs_modify );
			Debug( LDAP_DEBUG_SYNC,
					"syncrepl_entry: %s (%d)\n", 
					"be_modify", rc, 0 );
			if ( rs_modify.sr_err != LDAP_SUCCESS ) {
				Debug( LDAP_DEBUG_ANY,
					"syncrepl_entry : be_modify failed (%d)\n",
					rs_modify.sr_err, 0, 0 );
			}
		}
		ret = 1;
		goto done;
	case LDAP_SYNC_DELETE :
		if ( !BER_BVISNULL( &dni.dn )) {
			op->o_req_dn = dni.dn;
			op->o_req_ndn = dni.ndn;
			op->o_tag = LDAP_REQ_DELETE;
			rc = be->be_delete( op, &rs_delete );
			Debug( LDAP_DEBUG_SYNC,
					"syncrepl_entry: %s (%d)\n", 
					"be_delete", rc, 0 );

			while ( rs_delete.sr_err == LDAP_SUCCESS
				&& op->o_delete_glue_parent ) {
				op->o_delete_glue_parent = 0;
				if ( !be_issuffix( op->o_bd, &op->o_req_ndn )) {
					slap_callback cb = { NULL };
					cb.sc_response = slap_null_cb;
					dnParent( &op->o_req_ndn, &pdn );
					op->o_req_dn = pdn;
					op->o_req_ndn = pdn;
					op->o_callback = &cb;
					op->o_bd->be_delete( op, &rs_delete );
				} else {
					break;
				}
			}
		}
		ret = 0;
		goto done;

	default :
		Debug( LDAP_DEBUG_ANY,
			"syncrepl_entry : unknown syncstate\n", 0, 0, 0 );
		ret = 1;
		goto done;
	}

done :
	if ( !BER_BVISNULL( &syncUUID_strrep ) ) {
		slap_sl_free( syncUUID_strrep.bv_val, op->o_tmpmemctx );
		BER_BVZERO( &syncUUID_strrep );
	}
	if ( dni.ads ) {
		op->o_tmpfree( dni.ads, op->o_tmpmemctx );
	}
	if ( !BER_BVISNULL( &dni.ndn ) ) {
		op->o_tmpfree( dni.ndn.bv_val, op->o_tmpmemctx );
	}
	if ( !BER_BVISNULL( &dni.dn ) ) {
		op->o_tmpfree( dni.dn.bv_val, op->o_tmpmemctx );
	}
	return ret;
}

static struct berval gcbva[] = {
	BER_BVC("top"),
	BER_BVC("glue"),
	BER_BVNULL
};

static void
syncrepl_del_nonpresent(
	Operation *op,
	syncinfo_t *si )
{
	Backend* be = op->o_bd;
	slap_callback	cb = { NULL };
	SlapReply	rs_search = {REP_RESULT};
	SlapReply	rs_delete = {REP_RESULT};
	SlapReply	rs_modify = {REP_RESULT};
	struct nonpresent_entry *np_list, *np_prev;
	int rc;
	Modifications *ml;
	Modifications *mlnext;
	Modifications *mod;
	Modifications *modlist = NULL;
	Modifications **modtail;
	AttributeName	an[2];

	struct berval pdn = BER_BVNULL;
	struct berval org_req_dn = BER_BVNULL;
	struct berval org_req_ndn = BER_BVNULL;
	struct berval org_dn = BER_BVNULL;
	struct berval org_ndn = BER_BVNULL;
	int	org_managedsait;

	op->o_req_dn = si->si_base;
	op->o_req_ndn = si->si_base;

	cb.sc_response = nonpresent_callback;
	cb.sc_private = si;

	op->o_callback = &cb;
	op->o_tag = LDAP_REQ_SEARCH;
	op->ors_scope = si->si_scope;
	op->ors_deref = LDAP_DEREF_NEVER;
	op->o_time = slap_get_time();
	op->ors_tlimit = SLAP_NO_LIMIT;
	op->ors_slimit = SLAP_NO_LIMIT;

	memset( &an[0], 0, 2 * sizeof( AttributeName ) );
	an[0].an_name = slap_schema.si_ad_entryUUID->ad_cname;
	an[0].an_desc = slap_schema.si_ad_entryUUID;
	op->ors_attrs = an;

	op->ors_attrsonly = 0;
	op->ors_filter = str2filter_x( op, si->si_filterstr.bv_val );
	op->ors_filterstr = si->si_filterstr;

	op->o_nocaching = 1;
	op->o_managedsait = SLAP_CONTROL_NONE;

	if ( limits_check( op, &rs_search ) == 0 ) {
		rc = be->be_search( op, &rs_search );
	}

	op->o_managedsait = SLAP_CONTROL_NONCRITICAL;
	op->o_nocaching = 0;

	if ( op->ors_filter ) filter_free_x( op, op->ors_filter );

	if ( !LDAP_LIST_EMPTY( &si->si_nonpresentlist ) ) {
		np_list = LDAP_LIST_FIRST( &si->si_nonpresentlist );
		while ( np_list != NULL ) {
			LDAP_LIST_REMOVE( np_list, npe_link );
			np_prev = np_list;
			np_list = LDAP_LIST_NEXT( np_list, npe_link );
			op->o_tag = LDAP_REQ_DELETE;
			op->o_callback = &cb;
			cb.sc_response = null_callback;
			cb.sc_private = si;
			op->o_req_dn = *np_prev->npe_name;
			op->o_req_ndn = *np_prev->npe_nname;
			rc = op->o_bd->be_delete( op, &rs_delete );

			if ( rs_delete.sr_err == LDAP_NOT_ALLOWED_ON_NONLEAF ) {
				modtail = &modlist;
				mod = (Modifications *) ch_calloc( 1, sizeof( Modifications ));
				mod->sml_op = LDAP_MOD_REPLACE;
				mod->sml_desc = slap_schema.si_ad_objectClass;
				mod->sml_type = mod->sml_desc->ad_cname;
				mod->sml_values = &gcbva[0];
				*modtail = mod;
				modtail = &mod->sml_next;

				mod = (Modifications *) ch_calloc( 1, sizeof( Modifications ));
				mod->sml_op = LDAP_MOD_REPLACE;
				mod->sml_desc = slap_schema.si_ad_structuralObjectClass;
				mod->sml_type = mod->sml_desc->ad_cname;
				mod->sml_values = &gcbva[1];
				*modtail = mod;
				modtail = &mod->sml_next;

				op->o_tag = LDAP_REQ_MODIFY;
				op->orm_modlist = modlist;

				rc = be->be_modify( op, &rs_modify );

				for ( ml = modlist; ml != NULL; ml = mlnext ) {
					mlnext = ml->sml_next;
					free( ml );
				}
			}

			org_req_dn = op->o_req_dn;
			org_req_ndn = op->o_req_ndn;
			org_dn = op->o_dn;
			org_ndn = op->o_ndn;
			org_managedsait = get_manageDSAit( op );
			op->o_dn = op->o_bd->be_rootdn;
			op->o_ndn = op->o_bd->be_rootndn;
			op->o_managedsait = SLAP_CONTROL_NONCRITICAL;

			while ( rs_delete.sr_err == LDAP_SUCCESS &&
					op->o_delete_glue_parent ) {
				op->o_delete_glue_parent = 0;
				if ( !be_issuffix( op->o_bd, &op->o_req_ndn )) {
					slap_callback cb = { NULL };
					cb.sc_response = slap_null_cb;
					dnParent( &op->o_req_ndn, &pdn );
					op->o_req_dn = pdn;
					op->o_req_ndn = pdn;
					op->o_callback = &cb;
					/* give it a root privil ? */
					op->o_bd->be_delete( op, &rs_delete );
				} else {
					break;
			    }
			}

			op->o_managedsait = org_managedsait;
			op->o_dn = org_dn;
			op->o_ndn = org_ndn;
			op->o_req_dn = org_req_dn;
			op->o_req_ndn = org_req_ndn;
			op->o_delete_glue_parent = 0;

			ber_bvfree( np_prev->npe_name );
			ber_bvfree( np_prev->npe_nname );
			BER_BVZERO( &op->o_req_dn );
			BER_BVZERO( &op->o_req_ndn );
			ch_free( np_prev );
		}
	}

	return;
}

void
syncrepl_add_glue(
	Operation* op,
	Entry *e )
{
	Backend *be = op->o_bd;
	slap_callback cb = { NULL };
	Attribute	*a;
	int	rc;
	int suffrdns;
	int i;
	struct berval dn = {0, NULL};
	struct berval ndn = {0, NULL};
	Entry	*glue;
	SlapReply	rs_add = {REP_RESULT};
	char	*ptr, *comma;

	op->o_tag = LDAP_REQ_ADD;
	op->o_callback = &cb;
	cb.sc_response = null_callback;
	cb.sc_private = NULL;

	dn = e->e_name;
	ndn = e->e_nname;

	/* count RDNs in suffix */
	if ( !BER_BVISEMPTY( &be->be_nsuffix[0] ) ) {
		for ( i = 0, ptr = be->be_nsuffix[0].bv_val; ptr; ptr = strchr( ptr, ',' ) ) {
			ptr++;
			i++;
		}
		suffrdns = i;
	} else {
		/* suffix is "" */
		suffrdns = 0;
	}

	/* Start with BE suffix */
	for ( i = 0, ptr = NULL; i < suffrdns; i++ ) {
		comma = strrchr( dn.bv_val, ',' );
		if ( ptr ) *ptr = ',';
		if ( comma ) *comma = '\0';
		ptr = comma;
	}
	if ( ptr ) {
		*ptr++ = ',';
		dn.bv_len -= ptr - dn.bv_val;
		dn.bv_val = ptr;
	}
	/* the normalizedDNs are always the same length, no counting
	 * required.
	 */
	if ( ndn.bv_len > be->be_nsuffix[0].bv_len ) {
		ndn.bv_val += ndn.bv_len - be->be_nsuffix[0].bv_len;
		ndn.bv_len = be->be_nsuffix[0].bv_len;
	}

	while ( ndn.bv_val > e->e_nname.bv_val ) {
		glue = (Entry *) ch_calloc( 1, sizeof(Entry) );
		ber_dupbv( &glue->e_name, &dn );
		ber_dupbv( &glue->e_nname, &ndn );

		a = ch_calloc( 1, sizeof( Attribute ));
		a->a_desc = slap_schema.si_ad_objectClass;

		a->a_vals = ch_calloc( 3, sizeof( struct berval ));
		ber_dupbv( &a->a_vals[0], &gcbva[0] );
		ber_dupbv( &a->a_vals[1], &gcbva[1] );
		ber_dupbv( &a->a_vals[2], &gcbva[2] );

		a->a_nvals = a->a_vals;

		a->a_next = glue->e_attrs;
		glue->e_attrs = a;

		a = ch_calloc( 1, sizeof( Attribute ));
		a->a_desc = slap_schema.si_ad_structuralObjectClass;

		a->a_vals = ch_calloc( 2, sizeof( struct berval ));
		ber_dupbv( &a->a_vals[0], &gcbva[1] );
		ber_dupbv( &a->a_vals[1], &gcbva[2] );

		a->a_nvals = a->a_vals;

		a->a_next = glue->e_attrs;
		glue->e_attrs = a;

		op->o_req_dn = glue->e_name;
		op->o_req_ndn = glue->e_nname;
		op->ora_e = glue;
		rc = be->be_add ( op, &rs_add );
		if ( rs_add.sr_err == LDAP_SUCCESS ) {
			be_entry_release_w( op, glue );
		} else {
		/* incl. ALREADY EXIST */
			entry_free( glue );
		}

		/* Move to next child */
		for (ptr = dn.bv_val-2; ptr > e->e_name.bv_val && *ptr != ','; ptr--) {
			/* empty */
		}
		if ( ptr == e->e_name.bv_val ) break;
		dn.bv_val = ++ptr;
		dn.bv_len = e->e_name.bv_len - (ptr-e->e_name.bv_val);
		for( ptr = ndn.bv_val-2;
			ptr > e->e_nname.bv_val && *ptr != ',';
			ptr--)
		{
			/* empty */
		}
		ndn.bv_val = ++ptr;
		ndn.bv_len = e->e_nname.bv_len - (ptr-e->e_nname.bv_val);
	}

	op->o_req_dn = e->e_name;
	op->o_req_ndn = e->e_nname;
	op->ora_e = e;
	rc = be->be_add ( op, &rs_add );
	if ( rs_add.sr_err == LDAP_SUCCESS ) {
		be_entry_release_w( op, e );
	} else {
		entry_free( e );
	}

	return;
}

static struct berval ocbva[] = {
	BER_BVC("top"),
	BER_BVC("subentry"),
	BER_BVC("syncConsumerSubentry"),
	BER_BVNULL
};

static struct berval cnbva[] = {
	BER_BVNULL,
	BER_BVNULL
};

static struct berval ssbva[] = {
	BER_BVC("{}"),
	BER_BVNULL
};

static struct berval scbva[] = {
	BER_BVNULL,
	BER_BVNULL
};

void
syncrepl_updateCookie(
	syncinfo_t *si,
	Operation *op,
	struct berval *pdn,
	struct sync_cookie *syncCookie )
{
	Backend *be = op->o_bd;
	Modifications *ml;
	Modifications *mlnext;
	Modifications *mod;
	Modifications *modlist = NULL;
	Modifications **modtail = &modlist;

	const char	*text;
	char txtbuf[SLAP_TEXT_BUFLEN];
	size_t textlen = sizeof txtbuf;

	Entry* e = NULL;
	int rc;

	char syncrepl_cbuf[sizeof(CN_STR SYNCREPL_STR)];
	struct berval slap_syncrepl_dn_bv = BER_BVNULL;
	struct berval slap_syncrepl_cn_bv = BER_BVNULL;
	
	slap_callback cb = { NULL };
	SlapReply	rs_add = {REP_RESULT};
	SlapReply	rs_modify = {REP_RESULT};

	slap_sync_cookie_free( &si->si_syncCookie, 0 );
	slap_dup_sync_cookie( &si->si_syncCookie, syncCookie );

	mod = (Modifications *) ch_calloc( 1, sizeof( Modifications ));
	mod->sml_op = LDAP_MOD_REPLACE;
	mod->sml_desc = slap_schema.si_ad_objectClass;
	mod->sml_type = mod->sml_desc->ad_cname;
	mod->sml_values = ocbva;
	*modtail = mod;
	modtail = &mod->sml_next;

	ber_dupbv( &cnbva[0], (struct berval *) &slap_syncrepl_bvc );
	assert( si->si_rid < 1000 );
	cnbva[0].bv_len = snprintf( cnbva[0].bv_val,
		slap_syncrepl_bvc.bv_len + 1,
		"syncrepl%ld", si->si_rid );
	mod = (Modifications *) ch_calloc( 1, sizeof( Modifications ));
	mod->sml_op = LDAP_MOD_REPLACE;
	mod->sml_desc = slap_schema.si_ad_cn;
	mod->sml_type = mod->sml_desc->ad_cname;
	mod->sml_values = cnbva;
	*modtail = mod;
	modtail = &mod->sml_next;

	mod = (Modifications *) ch_calloc( 1, sizeof( Modifications ));
	mod->sml_op = LDAP_MOD_REPLACE;
	mod->sml_desc = slap_schema.si_ad_subtreeSpecification;
	mod->sml_type = mod->sml_desc->ad_cname;
	mod->sml_values = ssbva;
	*modtail = mod;
	modtail = &mod->sml_next;

	/* Keep this last, so we can avoid touching the previous
	 * attributes unnecessarily.
	 */
	if ( scbva[0].bv_val ) ch_free( scbva[0].bv_val );
	ber_dupbv( &scbva[0], &si->si_syncCookie.octet_str[0] );
	mod = (Modifications *) ch_calloc( 1, sizeof( Modifications ));
	mod->sml_op = LDAP_MOD_REPLACE;
	mod->sml_desc = slap_schema.si_ad_syncreplCookie;
	mod->sml_type = mod->sml_desc->ad_cname;
	mod->sml_values = scbva;
	*modtail = mod;
	modtail = &mod->sml_next;

	slap_queue_csn( op, si->si_syncCookie.ctxcsn );

	mlnext = mod;

	op->o_tag = LDAP_REQ_ADD;
	rc = slap_mods_opattrs( op, modlist, modtail,
		 &text, txtbuf, textlen, 0 );

	for ( ml = modlist; ml != NULL; ml = ml->sml_next ) {
		ml->sml_op = LDAP_MOD_REPLACE;
	}

	if( rc != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_ANY, "syncrepl_updateCookie: mods opattrs (%s)\n",
			 text, 0, 0 );
	}

	e = ( Entry * ) ch_calloc( 1, sizeof( Entry ));

	slap_syncrepl_cn_bv.bv_val = syncrepl_cbuf;
	assert( si->si_rid < 1000 );
	slap_syncrepl_cn_bv.bv_len = snprintf( slap_syncrepl_cn_bv.bv_val,
		slap_syncrepl_cn_bvc.bv_len + 1,
		"cn=syncrepl%ld", si->si_rid );

	build_new_dn( &slap_syncrepl_dn_bv, pdn, &slap_syncrepl_cn_bv,
		op->o_tmpmemctx );
	ber_dupbv( &e->e_name, &slap_syncrepl_dn_bv );
	ber_dupbv( &e->e_nname, &slap_syncrepl_dn_bv );

	if ( !BER_BVISNULL( &slap_syncrepl_dn_bv ) ) {
		slap_sl_free( slap_syncrepl_dn_bv.bv_val, op->o_tmpmemctx );
	}

	e->e_attrs = NULL;

	rc = slap_mods2entry( modlist, &e, 1, 1, &text, txtbuf, textlen );

	if( rc != LDAP_SUCCESS ) {
		Debug( LDAP_DEBUG_ANY, "syncrepl_updateCookie: mods2entry (%s)\n",
			 text, 0, 0 );
	}

	cb.sc_response = null_callback;
	cb.sc_private = si;

	op->o_callback = &cb;
	op->o_req_dn = e->e_name;
	op->o_req_ndn = e->e_nname;

	/* update persistent cookie */
update_cookie_retry:
	op->o_tag = LDAP_REQ_MODIFY;
	/* Just modify the cookie value, not the entire entry */
	op->orm_modlist = mod;
	rc = be->be_modify( op, &rs_modify );

	if ( rs_modify.sr_err != LDAP_SUCCESS ) {
		if ( rs_modify.sr_err == LDAP_REFERRAL ||
			 rs_modify.sr_err == LDAP_NO_SUCH_OBJECT ) {
			op->o_tag = LDAP_REQ_ADD;
			op->ora_e = e;
			rc = be->be_add( op, &rs_add );
			if ( rs_add.sr_err != LDAP_SUCCESS ) {
				if ( rs_add.sr_err == LDAP_ALREADY_EXISTS ) {
					goto update_cookie_retry;
				} else if ( rs_add.sr_err == LDAP_REFERRAL ||
							rs_add.sr_err == LDAP_NO_SUCH_OBJECT ) {
					Debug( LDAP_DEBUG_ANY,
						"cookie will be non-persistent\n",
						0, 0, 0 );
				} else {
					Debug( LDAP_DEBUG_ANY,
						"be_add failed (%d)\n", rs_add.sr_err, 0, 0 );
				}
			} else {
				be_entry_release_w( op, e );
				goto done;
			}
		} else {
			Debug( LDAP_DEBUG_ANY,
				"be_modify failed (%d)\n", rs_modify.sr_err, 0, 0 );
		}
	}
	if ( e != NULL ) {
		entry_free( e );
	}

done :
	slap_graduate_commit_csn( op );


	if ( !BER_BVISNULL( &cnbva[0] ) ) {
		ch_free( cnbva[0].bv_val );
		BER_BVZERO( &cnbva[0] );
	}
	if ( !BER_BVISNULL( &scbva[0] ) ) {
		ch_free( scbva[0].bv_val );
		BER_BVZERO( &scbva[0] );
	}

	if ( mlnext->sml_next ) {
		slap_mods_free( mlnext->sml_next );
		mlnext->sml_next = NULL;
	}

	for (ml = modlist ; ml != NULL; ml = mlnext ) {
		mlnext = ml->sml_next;
		free( ml );
	}

	return;
}

int
syncrepl_isupdate( Operation *op )
{
	return ( syncrepl_isupdate_dn( op->o_bd, &op->o_ndn ));
}

int
syncrepl_isupdate_dn(
	Backend*		be,
	struct berval*	ndn )
{
	syncinfo_t*	si;
	int			ret = 0;

	if ( !LDAP_STAILQ_EMPTY( &be->be_syncinfo )) {
		LDAP_STAILQ_FOREACH( si, &be->be_syncinfo, si_next ) {
			if ( ( ret = dn_match( &si->si_updatedn, ndn ) ) ) {
				return ret;
			}
		}
	}
	return 0;
}

static int
dn_callback(
	Operation*	op,
	SlapReply*	rs )
{
	dninfo *dni = op->o_callback->sc_private;

	if ( rs->sr_type == REP_SEARCH ) {
		if ( !BER_BVISNULL( &dni->dn ) ) {
			Debug( LDAP_DEBUG_ANY,
				"dn_callback : consistency error - "
				"entryUUID is not unique\n", 0, 0, 0 );
		} else {
			ber_dupbv_x( &dni->dn, &rs->sr_entry->e_name, op->o_tmpmemctx );
			ber_dupbv_x( &dni->ndn, &rs->sr_entry->e_nname, op->o_tmpmemctx );
			/* If there is a new entry, see if it differs from the old.
			 * We compare the non-normalized values so that cosmetic changes
			 * in the provider are always propagated.
			 */
			if ( dni->new_entry ) {
				Attribute *old, *new;
				int i;

				/* Did the DN change? Note that we don't explicitly try to
				 * discover if the deleteOldRdn argument applies here. It
				 * would save an unnecessary Modify if we detected it, but
				 * that's a fair amount of trouble to compare the two attr
				 * lists in detail.
				 */
				if ( !dn_match( &rs->sr_entry->e_name,
						&dni->new_entry->e_name ) )
				{
					dni->renamed = 1;
				}

				for ( i = 0, old = rs->sr_entry->e_attrs;
						old;
						i++, old = old->a_next )
					;

				dni->attrs = i;

				/* We assume that attributes are saved in the same order
				 * in the remote and local databases. So if we walk through
				 * the attributeDescriptions one by one they should match in
				 * lock step. If not, we signal a change. Otherwise we test
				 * all the values...
				 */
				for ( old = rs->sr_entry->e_attrs, new = dni->new_entry->e_attrs;
						old && new;
						old = old->a_next, new = new->a_next )
				{
					if ( old->a_desc != new->a_desc ) {
						dni->wasChanged = 1;
						break;
					}
					for ( i = 0; ; i++ ) {
						int nold, nnew;
						nold = BER_BVISNULL( &old->a_vals[i] );
						nnew = BER_BVISNULL( &new->a_vals[i] );
						/* If both are empty, stop looking */
						if ( nold && nnew ) {
							break;
						}
						/* If they are different, stop looking */
						if ( nold != nnew ) {
							dni->wasChanged = 1;
							break;
						}
						if ( ber_bvcmp( &old->a_vals[i], &new->a_vals[i] )) {
							dni->wasChanged = 1;
							break;
						}
					}
					if ( dni->wasChanged ) break;
				}
				if ( dni->wasChanged ) {
					dni->ads = op->o_tmpalloc( dni->attrs *
						sizeof(AttributeDescription *), op->o_tmpmemctx );
					i = 0;
					for ( old = rs->sr_entry->e_attrs; old; old = old->a_next ) {
						dni->ads[i] = old->a_desc;
						i++;
					}
				}
			}
		}
	} else if ( rs->sr_type == REP_RESULT ) {
		if ( rs->sr_err == LDAP_SIZELIMIT_EXCEEDED ) {
			Debug( LDAP_DEBUG_ANY,
				"dn_callback : consistency error - "
				"entryUUID is not unique\n", 0, 0, 0 );
		}
	}

	return LDAP_SUCCESS;
}

static int
nonpresent_callback(
	Operation*	op,
	SlapReply*	rs )
{
	syncinfo_t *si = op->o_callback->sc_private;
	Attribute *a;
	int count = 0;
	struct berval* present_uuid = NULL;
	struct nonpresent_entry *np_entry;

	if ( rs->sr_type == REP_RESULT ) {
		count = avl_free( si->si_presentlist, avl_ber_bvfree );
		si->si_presentlist = NULL;

	} else if ( rs->sr_type == REP_SEARCH ) {
		a = attr_find( rs->sr_entry->e_attrs, slap_schema.si_ad_entryUUID );

		if ( a == NULL ) return 0;

		present_uuid = avl_find( si->si_presentlist, &a->a_nvals[0],
			syncuuid_cmp );

		if ( present_uuid == NULL ) {
			np_entry = (struct nonpresent_entry *)
				ch_calloc( 1, sizeof( struct nonpresent_entry ));
			np_entry->npe_name = ber_dupbv( NULL, &rs->sr_entry->e_name );
			np_entry->npe_nname = ber_dupbv( NULL, &rs->sr_entry->e_nname );
			LDAP_LIST_INSERT_HEAD( &si->si_nonpresentlist, np_entry, npe_link );

		} else {
			avl_delete( &si->si_presentlist,
					&a->a_nvals[0], syncuuid_cmp );
			ch_free( present_uuid->bv_val );
			ch_free( present_uuid );
		}
	}
	return LDAP_SUCCESS;
}

static int
null_callback(
	Operation*	op,
	SlapReply*	rs )
{
	if ( rs->sr_err != LDAP_SUCCESS &&
		rs->sr_err != LDAP_REFERRAL &&
		rs->sr_err != LDAP_ALREADY_EXISTS &&
		rs->sr_err != LDAP_NO_SUCH_OBJECT &&
		rs->sr_err != LDAP_NOT_ALLOWED_ON_NONLEAF )
	{
		Debug( LDAP_DEBUG_ANY,
			"null_callback : error code 0x%x\n",
			rs->sr_err, 0, 0 );
	}
	return LDAP_SUCCESS;
}

Entry *
slap_create_syncrepl_entry(
	Backend *be,
	struct berval *context_csn,
	struct berval *rdn,
	struct berval *cn )
{
	Entry* e;

	struct berval bv;

	e = ( Entry * ) ch_calloc( 1, sizeof( Entry ));

	attr_merge( e, slap_schema.si_ad_objectClass, ocbva, NULL );

	attr_merge_one( e, slap_schema.si_ad_structuralObjectClass,
		&ocbva[1], NULL );

	attr_merge_one( e, slap_schema.si_ad_cn, cn, NULL );

	if ( context_csn ) {
		attr_merge_one( e, slap_schema.si_ad_syncreplCookie,
			context_csn, NULL );
	}

	BER_BVSTR( &bv, "{}" );
	attr_merge_one( e, slap_schema.si_ad_subtreeSpecification, &bv, NULL );

	build_new_dn( &e->e_name, &be->be_nsuffix[0], rdn, NULL );
	ber_dupbv( &e->e_nname, &e->e_name );

	return e;
}

struct berval *
slap_uuidstr_from_normalized(
	struct berval* uuidstr,
	struct berval* normalized,
	void *ctx )
{
	struct berval *new;
	unsigned char nibble;
	int i, d = 0;

	if ( normalized == NULL ) return NULL;
	if ( normalized->bv_len != 16 ) return NULL;

	if ( uuidstr ) {
		new = uuidstr;
	} else {
		new = (struct berval *)slap_sl_malloc( sizeof(struct berval), ctx );
		if ( new == NULL ) {
			return NULL;
		}
	}

	new->bv_len = 36;

	if ( ( new->bv_val = slap_sl_malloc( new->bv_len + 1, ctx ) ) == NULL ) {
		if ( new != uuidstr ) {
			slap_sl_free( new, ctx );
		}
		return NULL;
	}

	for ( i = 0; i < 16; i++ ) {
		if ( i == 4 || i == 6 || i == 8 || i == 10 ) {
			new->bv_val[(i<<1)+d] = '-';
			d += 1;
		}

		nibble = (normalized->bv_val[i] >> 4) & 0xF;
		if ( nibble < 10 ) {
			new->bv_val[(i<<1)+d] = nibble + '0';
		} else {
			new->bv_val[(i<<1)+d] = nibble - 10 + 'a';
		}

		nibble = (normalized->bv_val[i]) & 0xF;
		if ( nibble < 10 ) {
			new->bv_val[(i<<1)+d+1] = nibble + '0';
		} else {
			new->bv_val[(i<<1)+d+1] = nibble - 10 + 'a';
		}
	}

	new->bv_val[new->bv_len] = '\0';
	return new;
}

static int
syncuuid_cmp( const void* v_uuid1, const void* v_uuid2 )
{
	const struct berval *uuid1 = v_uuid1;
	const struct berval *uuid2 = v_uuid2;
	int rc = uuid1->bv_len - uuid2->bv_len;
	if ( rc ) return rc;
	return ( memcmp( uuid1->bv_val, uuid2->bv_val, uuid1->bv_len ) );
}

static void
avl_ber_bvfree( void *v_bv )
{
	struct berval	*bv = (struct berval *)v_bv;
	
	if( v_bv == NULL ) return;
	if ( !BER_BVISNULL( bv ) ) {
		ch_free( bv->bv_val );
	}
	ch_free( (char *) bv );
}

void
syncinfo_free( syncinfo_t *sie )
{
	if ( sie->si_provideruri ) {
		ch_free( sie->si_provideruri );
	}
	if ( sie->si_provideruri_bv ) {
		ber_bvarray_free( sie->si_provideruri_bv );
	}
	if ( sie->si_updatedn.bv_val ) {
		ch_free( sie->si_updatedn.bv_val );
	}
	if ( sie->si_binddn ) {
		ch_free( sie->si_binddn );
	}
	if ( sie->si_passwd ) {
		ch_free( sie->si_passwd );
	}
	if ( sie->si_saslmech ) {
		ch_free( sie->si_saslmech );
	}
	if ( sie->si_secprops ) {
		ch_free( sie->si_secprops );
	}
	if ( sie->si_realm ) {
		ch_free( sie->si_realm );
	}
	if ( sie->si_authcId ) {
		ch_free( sie->si_authcId );
	}
	if ( sie->si_authzId ) {
		ch_free( sie->si_authzId );
	}
	if ( sie->si_filterstr.bv_val ) {
		ch_free( sie->si_filterstr.bv_val );
	}
	if ( sie->si_base.bv_val ) {
		ch_free( sie->si_base.bv_val );
	}
	if ( sie->si_attrs ) {
		int i = 0;
		while ( sie->si_attrs[i] != NULL ) {
			ch_free( sie->si_attrs[i] );
			i++;
		}
		ch_free( sie->si_attrs );
	}
	if ( sie->si_exattrs ) {
		int i = 0;
		while ( sie->si_exattrs[i] != NULL ) {
			ch_free( sie->si_exattrs[i] );
			i++;
		}
		ch_free( sie->si_exattrs );
	}
	if ( sie->si_anlist ) {
		int i = 0;
		while ( sie->si_anlist[i].an_name.bv_val != NULL ) {
			ch_free( sie->si_anlist[i].an_name.bv_val );
			i++;
		}
		ch_free( sie->si_anlist );
	}
	if ( sie->si_exanlist ) {
		int i = 0;
		while ( sie->si_exanlist[i].an_name.bv_val != NULL ) {
			ch_free( sie->si_exanlist[i].an_name.bv_val );
			i++;
		}
		ch_free( sie->si_exanlist );
	}
	if ( sie->si_retryinterval ) {
		ch_free( sie->si_retryinterval );
	}
	if ( sie->si_retrynum ) {
		ch_free( sie->si_retrynum );
	}
	if ( sie->si_retrynum_init ) {
		ch_free( sie->si_retrynum_init );
	}
	slap_sync_cookie_free( &sie->si_syncCookie, 0 );
	if ( sie->si_presentlist ) {
	    avl_free( sie->si_presentlist, avl_ber_bvfree );
	}
	if ( sie->si_ld ) {
		ldap_ld_free( sie->si_ld, 1, NULL, NULL );
	}
	while ( !LDAP_LIST_EMPTY( &sie->si_nonpresentlist )) {
		struct nonpresent_entry* npe;
		npe = LDAP_LIST_FIRST( &sie->si_nonpresentlist );
		LDAP_LIST_REMOVE( npe, npe_link );
		if ( npe->npe_name ) {
			if ( npe->npe_name->bv_val ) {
				ch_free( npe->npe_name->bv_val );
			}
			ch_free( npe->npe_name );
		}
		if ( npe->npe_nname ) {
			if ( npe->npe_nname->bv_val ) {
				ch_free( npe->npe_nname->bv_val );
			}
			ch_free( npe->npe_nname );
		}
		ch_free( npe );
	}
	ch_free( sie );
}