text: /* delete.c - mdb backend delete routine */
  /* $OpenLDAP$ */
  /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   *
   * Copyright 2000-2020 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 "lutil.h"
  #include "back-mdb.h"
  
  int
  mdb_delete( Operation *op, SlapReply *rs )
  {
  	struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
  	struct berval	pdn = {0, NULL};
  	Entry	*e = NULL;
  	Entry	*p = NULL;
  	int		manageDSAit = get_manageDSAit( op );
  	AttributeDescription *children = slap_schema.si_ad_children;
  	AttributeDescription *entry = slap_schema.si_ad_entry;
  	MDB_txn		*txn = NULL;
  	MDB_cursor	*mc;
  	mdb_op_info opinfo = {{{ 0 }}}, *moi = &opinfo;
  
  	LDAPControl **preread_ctrl = NULL;
  	LDAPControl *ctrls[SLAP_MAX_RESPONSE_CONTROLS];
  	int num_ctrls = 0;
  
  	int	parent_is_glue = 0;
  	int parent_is_leaf = 0;
  
  	Debug( LDAP_DEBUG_ARGS, "==> " LDAP_XSTRING(mdb_delete) ": %s\n",
  		op->o_req_dn.bv_val );
  
  	if( op->o_txnSpec && txn_preop( op, rs ))
  		return rs->sr_err;
  
  	ctrls[num_ctrls] = 0;
  
  	/* begin transaction */
  	rs->sr_err = mdb_opinfo_get( op, mdb, 0, &moi );
  	rs->sr_text = NULL;
  	if( rs->sr_err != 0 ) {
  		Debug( LDAP_DEBUG_TRACE,
  			LDAP_XSTRING(mdb_delete) ": txn_begin failed: "
  			"%s (%d)\n", mdb_strerror(rs->sr_err), rs->sr_err );
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "internal error";
  		goto return_results;
  	}
  	txn = moi->moi_txn;
  
  	/* allocate CSN */
  	if ( BER_BVISNULL( &op->o_csn ) ) {
  		struct berval csn;
  		char csnbuf[LDAP_PVT_CSNSTR_BUFSIZE];
  
  		csn.bv_val = csnbuf;
  		csn.bv_len = sizeof(csnbuf);
  		slap_get_csn( op, &csn, 1 );
  	}
  
  	if ( !be_issuffix( op->o_bd, &op->o_req_ndn ) ) {
  		dnParent( &op->o_req_ndn, &pdn );
  	}
  
  	rs->sr_err = mdb_cursor_open( txn, mdb->mi_dn2id, &mc );
  	if ( rs->sr_err ) {
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "internal error";
  		goto return_results;
  	}
  	/* get parent */
  	rs->sr_err = mdb_dn2entry( op, txn, mc, &pdn, &p, NULL, 1 );
  	switch( rs->sr_err ) {
  	case 0:
  	case MDB_NOTFOUND:
  		break;
  	case LDAP_BUSY:
  		rs->sr_text = "ldap server busy";
  		goto return_results;
  	default:
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "internal error";
  		goto return_results;
  	}
  	if ( rs->sr_err == MDB_NOTFOUND ) {
  		Debug( LDAP_DEBUG_ARGS,
  			"<=- " LDAP_XSTRING(mdb_delete) ": no such object %s\n",
  			op->o_req_dn.bv_val );
  
  		if ( p && !BER_BVISEMPTY( &p->e_name )) {
  			rs->sr_matched = ch_strdup( p->e_name.bv_val );
  			if ( is_entry_referral( p )) {
  				BerVarray ref = get_entry_referrals( op, p );
  				rs->sr_ref = referral_rewrite( ref, &p->e_name,
  					&op->o_req_dn, LDAP_SCOPE_DEFAULT );
  				ber_bvarray_free( ref );
  			} else {
  				rs->sr_ref = NULL;
  			}
  		} else {
  			rs->sr_ref = referral_rewrite( default_referral, NULL,
  					&op->o_req_dn, LDAP_SCOPE_DEFAULT );
  		}
  		if ( p ) {
  			mdb_entry_return( op, p );
  			p = NULL;
  		}
  
  		rs->sr_err = LDAP_REFERRAL;
  		rs->sr_flags = REP_MATCHED_MUSTBEFREED | REP_REF_MUSTBEFREED;
  		goto return_results;
  	}
  
  	/* get entry */
  	rs->sr_err = mdb_dn2entry( op, txn, mc, &op->o_req_ndn, &e, NULL, 0 );
  	switch( rs->sr_err ) {
  	case MDB_NOTFOUND:
  		e = p;
  		p = NULL;
  	case 0:
  		break;
  	case LDAP_BUSY:
  		rs->sr_text = "ldap server busy";
  		goto return_results;
  	default:
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "internal error";
  		goto return_results;
  	}
  
  	/* FIXME : dn2entry() should return non-glue entry */
  	if ( rs->sr_err == MDB_NOTFOUND || ( !manageDSAit && is_entry_glue( e ))) {
  		Debug( LDAP_DEBUG_ARGS,
  			"<=- " LDAP_XSTRING(mdb_delete) ": no such object %s\n",
  			op->o_req_dn.bv_val );
  
  		rs->sr_matched = ch_strdup( e->e_dn );
  		if ( is_entry_referral( e )) {
  			BerVarray ref = get_entry_referrals( op, e );
  			rs->sr_ref = referral_rewrite( ref, &e->e_name,
  				&op->o_req_dn, LDAP_SCOPE_DEFAULT );
  			ber_bvarray_free( ref );
  		} else {
  			rs->sr_ref = NULL;
  		}
  		mdb_entry_return( op, e );
  		e = NULL;
  
  		rs->sr_err = LDAP_REFERRAL;
  		rs->sr_flags = REP_MATCHED_MUSTBEFREED | REP_REF_MUSTBEFREED;
  		goto return_results;
  	}
  
  	if ( pdn.bv_len != 0 ) {
  		/* check parent for "children" acl */
  		rs->sr_err = access_allowed( op, p,
  			children, NULL, ACL_WDEL, NULL );
  
  		if ( !rs->sr_err  ) {
  			Debug( LDAP_DEBUG_TRACE,
  				"<=- " LDAP_XSTRING(mdb_delete) ": no write "
  				"access to parent\n" );
  			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;
  
  				/* check parent for "children" acl */
  				rs->sr_err = access_allowed( op, p,
  					children, NULL, ACL_WDEL, NULL );
  
  				p = NULL;
  
  				if ( !rs->sr_err  ) {
  					Debug( LDAP_DEBUG_TRACE,
  						"<=- " LDAP_XSTRING(mdb_delete)
  						": no access to parent\n" );
  					rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
  					rs->sr_text = "no write access to parent";
  					goto return_results;
  				}
  
  			} else {
  				Debug( LDAP_DEBUG_TRACE,
  					"<=- " LDAP_XSTRING(mdb_delete)
  					": no parent and not root\n" );
  				rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
  				goto return_results;
  			}
  		}
  	}
  
  	if ( get_assert( op ) &&
  		( test_filter( op, e, get_assertion( op )) != LDAP_COMPARE_TRUE ))
  	{
  		rs->sr_err = LDAP_ASSERTION_FAILED;
  		goto return_results;
  	}
  
  	rs->sr_err = access_allowed( op, e,
  		entry, NULL, ACL_WDEL, NULL );
  
  	if ( !rs->sr_err  ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"<=- " LDAP_XSTRING(mdb_delete) ": no write access "
  			"to entry\n" );
  		rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
  		rs->sr_text = "no write access to entry";
  		goto return_results;
  	}
  
  	if ( !manageDSAit && is_entry_referral( e ) ) {
  		/* entry is a referral, don't allow delete */
  		rs->sr_ref = get_entry_referrals( op, e );
  
  		Debug( LDAP_DEBUG_TRACE,
  			LDAP_XSTRING(mdb_delete) ": entry is referral\n" );
  
  		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;
  	}
  
  	/* pre-read */
  	if( op->o_preread ) {
  		if( preread_ctrl == NULL ) {
  			preread_ctrl = &ctrls[num_ctrls++];
  			ctrls[num_ctrls] = NULL;
  		}
  		if( slap_read_controls( op, rs, e,
  			&slap_pre_read_bv, preread_ctrl ) )
  		{
  			Debug( LDAP_DEBUG_TRACE,
  				"<=- " LDAP_XSTRING(mdb_delete) ": pre-read "
  				"failed!\n" );
  			if ( op->o_preread & SLAP_CONTROL_CRITICAL ) {
  				/* FIXME: is it correct to abort
  				 * operation if control fails? */
  				goto return_results;
  			}
  		}
  	}
  
  	rs->sr_text = NULL;
  
  	/* Can't do it if we have kids */
  	rs->sr_err = mdb_dn2id_children( op, txn, e );
  	if( rs->sr_err != MDB_NOTFOUND ) {
  		switch( rs->sr_err ) {
  		case 0:
  			Debug(LDAP_DEBUG_ARGS,
  				"<=- " LDAP_XSTRING(mdb_delete)
  				": non-leaf %s\n",
  				op->o_req_dn.bv_val );
  			rs->sr_err = LDAP_NOT_ALLOWED_ON_NONLEAF;
  			rs->sr_text = "subordinate objects must be deleted first";
  			break;
  		default:
  			Debug(LDAP_DEBUG_ARGS,
  				"<=- " LDAP_XSTRING(mdb_delete)
  				": has_children failed: %s (%d)\n",
  				mdb_strerror(rs->sr_err), rs->sr_err );
  			rs->sr_err = LDAP_OTHER;
  			rs->sr_text = "internal error";
  		}
  		goto return_results;
  	}
  
  	/* delete from dn2id */
  	rs->sr_err = mdb_dn2id_delete( op, mc, e->e_id, 1 );
  	mdb_cursor_close( mc );
  	if ( rs->sr_err != 0 ) {
  		Debug(LDAP_DEBUG_TRACE,
  			"<=- " LDAP_XSTRING(mdb_delete) ": dn2id failed: "
  			"%s (%d)\n", mdb_strerror(rs->sr_err), rs->sr_err );
  		rs->sr_text = "DN index delete failed";
  		rs->sr_err = LDAP_OTHER;
  		goto return_results;
  	}
  
  	/* delete indices for old attributes */
  	rs->sr_err = mdb_index_entry_del( op, txn, e );
  	if ( rs->sr_err != LDAP_SUCCESS ) {
  		Debug(LDAP_DEBUG_TRACE,
  			"<=- " LDAP_XSTRING(mdb_delete) ": index failed: "
  			"%s (%d)\n", mdb_strerror(rs->sr_err), rs->sr_err );
  		rs->sr_text = "entry index delete failed";
  		rs->sr_err = LDAP_OTHER;
  		goto return_results;
  	}
  
  	/* fixup delete CSN */
  	if ( !SLAP_SHADOW( op->o_bd )) {
  		struct berval vals[2];
  
  		assert( !BER_BVISNULL( &op->o_csn ) );
  		vals[0] = op->o_csn;
  		BER_BVZERO( &vals[1] );
  		rs->sr_err = mdb_index_values( op, txn, slap_schema.si_ad_entryCSN,
  			vals, 0, SLAP_INDEX_ADD_OP );
  		if ( rs->sr_err != LDAP_SUCCESS ) {
  			rs->sr_text = "entryCSN index update failed";
  			rs->sr_err = LDAP_OTHER;
  			goto return_results;
  		}
  	}
  
  	/* delete from id2entry */
  	rs->sr_err = mdb_id2entry_delete( op->o_bd, txn, e );
  	if ( rs->sr_err != 0 ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"<=- " LDAP_XSTRING(mdb_delete) ": id2entry failed: "
  			"%s (%d)\n", mdb_strerror(rs->sr_err), rs->sr_err );
  		rs->sr_text = "entry delete failed";
  		rs->sr_err = LDAP_OTHER;
  		goto return_results;
  	}
  
  	if ( pdn.bv_len != 0 ) {
  		parent_is_glue = is_entry_glue(p);
  		rs->sr_err = mdb_dn2id_children( op, txn, p );
  		if ( rs->sr_err != MDB_NOTFOUND ) {
  			switch( rs->sr_err ) {
  			case 0:
  				break;
  			default:
  				Debug(LDAP_DEBUG_ARGS,
  					"<=- " LDAP_XSTRING(mdb_delete)
  					": has_children failed: %s (%d)\n",
  					mdb_strerror(rs->sr_err), rs->sr_err );
  				rs->sr_err = LDAP_OTHER;
  				rs->sr_text = "internal error";
  				goto return_results;
  			}
  			parent_is_leaf = 1;
  		}
  		mdb_entry_return( op, p );
  		p = NULL;
  	}
  
  	if( moi == &opinfo ) {
  		LDAP_SLIST_REMOVE( &op->o_extra, &opinfo.moi_oe, OpExtra, oe_next );
  		opinfo.moi_oe.oe_key = NULL;
  		if( op->o_noop ) {
  			mdb_txn_abort( txn );
  			rs->sr_err = LDAP_X_NO_OPERATION;
  			txn = NULL;
  			goto return_results;
  		} else {
  			rs->sr_err = mdb_txn_commit( txn );
  		}
  		txn = NULL;
  	}
  
  	if( rs->sr_err != 0 ) {
  		Debug( LDAP_DEBUG_ANY,
  			LDAP_XSTRING(mdb_delete) ": txn_%s failed: %s (%d)\n",
  			op->o_noop ? "abort (no-op)" : "commit",
  			mdb_strerror(rs->sr_err), rs->sr_err );
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "commit failed";
  
  		goto return_results;
  	}
  
  	Debug( LDAP_DEBUG_TRACE,
  		LDAP_XSTRING(mdb_delete) ": deleted%s id=%08lx dn=\"%s\"\n",
  		op->o_noop ? " (no-op)" : "",
  		e->e_id, op->o_req_dn.bv_val );
  	rs->sr_err = LDAP_SUCCESS;
  	rs->sr_text = NULL;
  	if( num_ctrls ) rs->sr_ctrls = ctrls;
  
  return_results:
  	if ( rs->sr_err == LDAP_SUCCESS && parent_is_glue && parent_is_leaf ) {
  		op->o_delete_glue_parent = 1;
  	}
  
  	if ( p != NULL ) {
  		mdb_entry_return( op, p );
  	}
  
  	/* free entry */
  	if( e != NULL ) {
  		mdb_entry_return( op, e );
  	}
  
  	if( moi == &opinfo ) {
  		if( txn != NULL ) {
  			mdb_txn_abort( txn );
  		}
  		if ( opinfo.moi_oe.oe_key ) {
  			LDAP_SLIST_REMOVE( &op->o_extra, &opinfo.moi_oe, OpExtra, oe_next );
  		}
  	} else {
  		moi->moi_ref--;
  	}
  
  	send_ldap_result( op, rs );
  	slap_graduate_commit_csn( op );
  
  	if( preread_ctrl != NULL && (*preread_ctrl) != NULL ) {
  		slap_sl_free( (*preread_ctrl)->ldctl_value.bv_val, op->o_tmpmemctx );
  		slap_sl_free( *preread_ctrl, op->o_tmpmemctx );
  	}
  
  #if 0
  	if( rs->sr_err == LDAP_SUCCESS && mdb->bi_txn_cp_kbyte ) {
  		TXN_CHECKPOINT( mdb->bi_dbenv,
  			mdb->bi_txn_cp_kbyte, mdb->bi_txn_cp_min, 0 );
  	}
  #endif
  	return rs->sr_err;
  }
  