/* delete.c - ldbm backend delete routine */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2005 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>.
 */

#include "portable.h"

#include <stdio.h>

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

#include "slap.h"
#include "back-ldbm.h"
#include "proto-back-ldbm.h"
#include "lutil.h"

int
ldbm_back_delete(
    Operation	*op,
    SlapReply	*rs )
{
	struct ldbminfo	*li = (struct ldbminfo *) op->o_bd->be_private;
	Entry	*matched;
	struct berval	pdn;
	Entry	*e, *p = NULL;
	int	rc = -1;
	int		manageDSAit = get_manageDSAit( op );
	AttributeDescription *children = slap_schema.si_ad_children;
	AttributeDescription *entry = slap_schema.si_ad_entry;

	Debug(LDAP_DEBUG_ARGS, "==> ldbm_back_delete: %s\n", op->o_req_dn.bv_val, 0, 0);

	/* grab giant lock for writing */
	ldap_pvt_thread_rdwr_wlock(&li->li_giant_rwlock);

	/* allocate CSN */
	if ( !SLAP_SHADOW( op->o_bd )) {
		struct berval csn;
		char csnbuf[LDAP_LUTIL_CSNSTR_BUFSIZE];

		csn.bv_val = csnbuf;
		csn.bv_len = sizeof(csnbuf);
		slap_get_csn( op, &csn, 1 );
	}

	/* get entry with writer lock */
	e = dn2entry_w( op->o_bd, &op->o_req_ndn, &matched );

	/* FIXME : dn2entry() should return non-glue entry */
	if ( e == NULL || ( !manageDSAit && is_entry_glue( e ))) {
		Debug(LDAP_DEBUG_ARGS, "<=- ldbm_back_delete: no such object %s\n",
			op->o_req_dn.bv_val, 0, 0);

		if ( matched != NULL ) {
			rs->sr_matched = ch_strdup( matched->e_dn );
			rs->sr_ref = is_entry_referral( matched )
				? get_entry_referrals( op, matched )
				: NULL;
			cache_return_entry_r( &li->li_cache, matched );

		} else {
			rs->sr_ref = referral_rewrite( default_referral, NULL,
							&op->o_req_dn, LDAP_SCOPE_DEFAULT );
		}

		rs->sr_err = LDAP_REFERRAL;
		rs->sr_flags |= REP_MATCHED_MUSTBEFREED | REP_REF_MUSTBEFREED;
		goto return_results;
	}

	/* check entry for "entry" acl */
	if ( ! access_allowed( op, e, entry, NULL, ACL_WDEL, NULL ) )
	{
		Debug( LDAP_DEBUG_TRACE,
			"<=- ldbm_back_delete: no write access to entry\n", 0,
			0, 0 );

		rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
		rs->sr_text = "no write access to entry";
		goto return_results;
	}

	if ( !manageDSAit && is_entry_referral( e ) ) {
		/* parent is a referral, don't allow add */
		/* parent is an alias, don't allow add */
		rs->sr_ref = get_entry_referrals( op, e );

		Debug( LDAP_DEBUG_TRACE, "entry is referral\n", 0,
		    0, 0 );

		rs->sr_err = LDAP_REFERRAL;
		rs->sr_matched = ch_strdup( e->e_name.bv_val );
		rs->sr_flags = REP_MATCHED_MUSTBEFREED | REP_REF_MUSTBEFREED;
		goto return_results;
	}

	if ( has_children( op->o_bd, e ) ) {
		Debug(LDAP_DEBUG_ARGS, "<=- ldbm_back_delete: non leaf %s\n",
			op->o_req_dn.bv_val, 0, 0);

		rs->sr_err = LDAP_NOT_ALLOWED_ON_NONLEAF;
		rs->sr_text = "subordinate objects must be deleted first";
		goto return_results;
	}

	/* delete from parent's id2children entry */
	if( !be_issuffix( op->o_bd, &e->e_nname ) && (dnParent( &e->e_nname, &pdn ),
		pdn.bv_len) ) {
		if( (p = dn2entry_w( op->o_bd, &pdn, NULL )) == NULL) {
			Debug( LDAP_DEBUG_TRACE,
				"<=- ldbm_back_delete: parent does not exist\n",
				0, 0, 0);

			rs->sr_err = LDAP_OTHER;
			rs->sr_text = "could not locate parent of entry";
			goto return_results;
		}

		/* check parent for "children" acl */
		if ( ! access_allowed( op, p,
			children, NULL, ACL_WDEL, NULL ) )
		{
			Debug( LDAP_DEBUG_TRACE,
				"<=- ldbm_back_delete: no access to parent\n", 0,
				0, 0 );

			rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
			rs->sr_text = "no write access to parent";
			goto return_results;
		}

	} else {
		/* no parent, must be root to delete */
		if( ! be_isroot( op ) ) {
			if ( be_issuffix( op->o_bd, (struct berval *)&slap_empty_bv )
				|| be_shadow_update( op ) ) {
				p = (Entry *)&slap_entry_root;
				
				rc = access_allowed( op, p,
					children, NULL, ACL_WDEL, NULL );
				p = NULL;
								
				/* check parent for "children" acl */
				if ( ! rc ) {
					Debug( LDAP_DEBUG_TRACE,
						"<=- ldbm_back_delete: no "
						"access to parent\n", 0, 0, 0 );

					rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
					rs->sr_text = "no write access to parent";
					goto return_results;
				}

			} else {
				Debug( LDAP_DEBUG_TRACE,
					"<=- ldbm_back_delete: no parent & "
					"not root\n", 0, 0, 0);

				rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
				goto return_results;
			}
		}
	}

	/* delete from dn2id mapping */
	if ( dn2id_delete( op->o_bd, &e->e_nname, e->e_id ) != 0 ) {
		Debug(LDAP_DEBUG_ARGS,
			"<=- ldbm_back_delete: operations error %s\n",
			op->o_req_dn.bv_val, 0, 0);

		rs->sr_err = LDAP_OTHER;
		rs->sr_text = "DN index delete failed";
		goto return_results;
	}

	/* delete from disk and cache */
	if ( id2entry_delete( op->o_bd, e ) != 0 ) {
		Debug(LDAP_DEBUG_ARGS,
			"<=- ldbm_back_delete: operations error %s\n",
			op->o_req_dn.bv_val, 0, 0);

		rs->sr_err = LDAP_OTHER;
		rs->sr_text = "entry delete failed";
		goto return_results;
	}

	/* delete attribute indices */
	(void) index_entry_del( op, e );

	rs->sr_err = LDAP_SUCCESS;

return_results:;
	rc = rs->sr_err;

	if( p != NULL ) {
		/* free parent and writer lock */
		cache_return_entry_w( &li->li_cache, p );
	}

	if ( e != NULL ) {
		/* free entry and writer lock */
		cache_return_entry_w( &li->li_cache, e );
	}

	ldap_pvt_thread_rdwr_wunlock(&li->li_giant_rwlock);

	send_ldap_result( op, rs );
	if ( !SLAP_SHADOW( op->o_bd ))
		slap_graduate_commit_csn( op );

	return rc;
}