text: /* $OpenLDAP: pkg/ldap/servers/slapd/back-sql/delete.c,v 1.35.2.10 2010/04/13 20:23:42 kurt Exp $ */
  /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   *
   * Copyright 1999-2010 The OpenLDAP Foundation.
   * Portions Copyright 1999 Dmitry Kovalev.
   * Portions Copyright 2002 Pierangelo Masarati.
   * 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>.
   */
  /* ACKNOWLEDGEMENTS:
   * This work was initially developed by Dmitry Kovalev for inclusion
   * by OpenLDAP Software.  Additional significant contributors include
   * Pierangelo Masarati.
   */
  
  #include "portable.h"
  
  #include <stdio.h>
  #include <sys/types.h>
  #include "ac/string.h"
  
  #include "slap.h"
  #include "proto-sql.h"
  
  typedef struct backsql_delete_attr_t {
  	Operation 		*op;
  	SlapReply		*rs;
  	SQLHDBC			dbh; 
  	backsql_entryID		*e_id;
  } backsql_delete_attr_t;
  
  static int
  backsql_delete_attr_f( void *v_at, void *v_bda )
  {
  	backsql_at_map_rec	*at = (backsql_at_map_rec *)v_at;
  	backsql_delete_attr_t	*bda = (backsql_delete_attr_t *)v_bda;
  	int			rc;
  
  	rc = backsql_modify_delete_all_values( bda->op,
  			bda->rs, bda->dbh, bda->e_id, at );
  
  	if ( rc != LDAP_SUCCESS ) {
  		return BACKSQL_AVL_STOP;
  	}
  
  	return BACKSQL_AVL_CONTINUE;
  }
  
  static int
  backsql_delete_all_attrs(
  	Operation 		*op,
  	SlapReply		*rs,
  	SQLHDBC			dbh, 
  	backsql_entryID		*eid )
  {
  	backsql_delete_attr_t	bda;
  	int			rc;
  
  	bda.op = op;
  	bda.rs = rs;
  	bda.dbh = dbh;
  	bda.e_id = eid;
  	
  	rc = avl_apply( eid->eid_oc->bom_attrs, backsql_delete_attr_f, &bda,
  			BACKSQL_AVL_STOP, AVL_INORDER );
  	if ( rc == BACKSQL_AVL_STOP ) {
  		return rs->sr_err;
  	}
  
  	return LDAP_SUCCESS;
  }
  
  static int
  backsql_delete_int(
  	Operation	*op,
  	SlapReply	*rs,
  	SQLHDBC		dbh,
  	SQLHSTMT	*sthp,
  	backsql_entryID	*eid,
  	Entry		**ep )
  {
  	backsql_info 		*bi = (backsql_info*)op->o_bd->be_private;
  	SQLHSTMT		sth = SQL_NULL_HSTMT;
  	RETCODE			rc;
  	int			prc = LDAP_SUCCESS;
  	/* first parameter no */
  	SQLUSMALLINT		pno = 0;
  
  	sth = *sthp;
  
  	/* avl_apply ... */
  	rs->sr_err = backsql_delete_all_attrs( op, rs, dbh, eid );
  	if ( rs->sr_err != LDAP_SUCCESS ) {
  		goto done;
  	}
  
  	rc = backsql_Prepare( dbh, &sth, eid->eid_oc->bom_delete_proc, 0 );
  	if ( rc != SQL_SUCCESS ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"   backsql_delete(): "
  			"error preparing delete query\n", 
  			0, 0, 0 );
  		backsql_PrintErrors( bi->sql_db_env, dbh, sth, rc );
  
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "SQL-backend error";
  		*ep = NULL;
  		goto done;
  	}
  
  	if ( BACKSQL_IS_DEL( eid->eid_oc->bom_expect_return ) ) {
  		pno = 1;
  		rc = backsql_BindParamInt( sth, 1, SQL_PARAM_OUTPUT, &prc );
  		if ( rc != SQL_SUCCESS ) {
  			Debug( LDAP_DEBUG_TRACE,
  				"   backsql_delete(): "
  				"error binding output parameter for objectClass %s\n",
  				eid->eid_oc->bom_oc->soc_cname.bv_val, 0, 0 );
  			backsql_PrintErrors( bi->sql_db_env, dbh, 
  				sth, rc );
  			SQLFreeStmt( sth, SQL_DROP );
  
  			rs->sr_text = "SQL-backend error";
  			rs->sr_err = LDAP_OTHER;
  			*ep = NULL;
  			goto done;
  		}
  	}
  
  	rc = backsql_BindParamID( sth, pno + 1, SQL_PARAM_INPUT, &eid->eid_keyval );
  	if ( rc != SQL_SUCCESS ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"   backsql_delete(): "
  			"error binding keyval parameter for objectClass %s\n",
  			eid->eid_oc->bom_oc->soc_cname.bv_val, 0, 0 );
  		backsql_PrintErrors( bi->sql_db_env, dbh, 
  			sth, rc );
  		SQLFreeStmt( sth, SQL_DROP );
  
  		rs->sr_text = "SQL-backend error";
  		rs->sr_err = LDAP_OTHER;
  		*ep = NULL;
  		goto done;
  	}
  
  	rc = SQLExecute( sth );
  	if ( rc == SQL_SUCCESS && prc == LDAP_SUCCESS ) {
  		rs->sr_err = LDAP_SUCCESS;
  
  	} else {
  		Debug( LDAP_DEBUG_TRACE, "   backsql_delete(): "
  			"delete_proc execution failed (rc=%d, prc=%d)\n",
  			rc, prc, 0 );
  
  
  		if ( prc != LDAP_SUCCESS ) {
  			/* SQL procedure executed fine 
  			 * but returned an error */
  			rs->sr_err = BACKSQL_SANITIZE_ERROR( prc );
  
  		} else {
  			backsql_PrintErrors( bi->sql_db_env, dbh,
  					sth, rc );
  			rs->sr_err = LDAP_OTHER;
  		}
  		SQLFreeStmt( sth, SQL_DROP );
  		goto done;
  	}
  	SQLFreeStmt( sth, SQL_DROP );
  
  	/* delete "auxiliary" objectClasses, if any... */
  	rc = backsql_Prepare( dbh, &sth, bi->sql_delobjclasses_stmt, 0 );
  	if ( rc != SQL_SUCCESS ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"   backsql_delete(): "
  			"error preparing ldap_entry_objclasses delete query\n", 
  			0, 0, 0 );
  		backsql_PrintErrors( bi->sql_db_env, dbh, sth, rc );
  
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "SQL-backend error";
  		*ep = NULL;
  		goto done;
  	}
  
  	rc = backsql_BindParamID( sth, 1, SQL_PARAM_INPUT, &eid->eid_id );
  	if ( rc != SQL_SUCCESS ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"   backsql_delete(): "
  			"error binding auxiliary objectClasses "
  			"entry ID parameter for objectClass %s\n",
  			eid->eid_oc->bom_oc->soc_cname.bv_val, 0, 0 );
  		backsql_PrintErrors( bi->sql_db_env, dbh, 
  			sth, rc );
  		SQLFreeStmt( sth, SQL_DROP );
  
  		rs->sr_text = "SQL-backend error";
  		rs->sr_err = LDAP_OTHER;
  		*ep = NULL;
  		goto done;
  	}
  
  	rc = SQLExecute( sth );
  	switch ( rc ) {
  	case SQL_NO_DATA:
  		/* apparently there were no "auxiliary" objectClasses
  		 * for this entry... */
  	case SQL_SUCCESS:
  		break;
  
  	default:
  		Debug( LDAP_DEBUG_TRACE, "   backsql_delete(): "
  			"failed to delete record from ldap_entry_objclasses\n", 
  			0, 0, 0 );
  		backsql_PrintErrors( bi->sql_db_env, dbh, sth, rc );
  		SQLFreeStmt( sth, SQL_DROP );
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "SQL-backend error";
  		*ep = NULL;
  		goto done;
  	}
  	SQLFreeStmt( sth, SQL_DROP );
  
  	/* delete entry... */
  	rc = backsql_Prepare( dbh, &sth, bi->sql_delentry_stmt, 0 );
  	if ( rc != SQL_SUCCESS ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"   backsql_delete(): "
  			"error preparing ldap_entries delete query\n", 
  			0, 0, 0 );
  		backsql_PrintErrors( bi->sql_db_env, dbh, sth, rc );
  
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "SQL-backend error";
  		*ep = NULL;
  		goto done;
  	}
  
  	rc = backsql_BindParamID( sth, 1, SQL_PARAM_INPUT, &eid->eid_id );
  	if ( rc != SQL_SUCCESS ) {
  		Debug( LDAP_DEBUG_TRACE,
  			"   backsql_delete(): "
  			"error binding entry ID parameter "
  			"for objectClass %s\n",
  			eid->eid_oc->bom_oc->soc_cname.bv_val, 0, 0 );
  		backsql_PrintErrors( bi->sql_db_env, dbh, 
  			sth, rc );
  		SQLFreeStmt( sth, SQL_DROP );
  
  		rs->sr_text = "SQL-backend error";
  		rs->sr_err = LDAP_OTHER;
  		*ep = NULL;
  		goto done;
  	}
  
  	rc = SQLExecute( sth );
  	if ( rc != SQL_SUCCESS ) {
  		Debug( LDAP_DEBUG_TRACE, "   backsql_delete(): "
  			"failed to delete record from ldap_entries\n", 
  			0, 0, 0 );
  		backsql_PrintErrors( bi->sql_db_env, dbh, sth, rc );
  		SQLFreeStmt( sth, SQL_DROP );
  		rs->sr_err = LDAP_OTHER;
  		rs->sr_text = "SQL-backend error";
  		*ep = NULL;
  		goto done;
  	}
  	SQLFreeStmt( sth, SQL_DROP );
  
  	rs->sr_err = LDAP_SUCCESS;
  	*ep = NULL;
  
  done:;
  	*sthp = sth;
  
  	return rs->sr_err;
  }
  
  typedef struct backsql_tree_delete_t {
  	Operation	*btd_op;
  	int		btd_rc;
  	backsql_entryID	*btd_eid;
  } backsql_tree_delete_t;
  
  static int
  backsql_tree_delete_search_cb( Operation *op, SlapReply *rs )
  {
  	if ( rs->sr_type == REP_SEARCH ) {
  		backsql_tree_delete_t	*btd;
  		backsql_entryID		*eid;
  
  		btd = (backsql_tree_delete_t *)op->o_callback->sc_private;
  
  		if ( !access_allowed( btd->btd_op, rs->sr_entry,
  			slap_schema.si_ad_entry, NULL, ACL_WDEL, NULL )
  			|| !access_allowed( btd->btd_op, rs->sr_entry,
  			slap_schema.si_ad_children, NULL, ACL_WDEL, NULL ) )
  		{
  			btd->btd_rc = LDAP_INSUFFICIENT_ACCESS;
  			return rs->sr_err = LDAP_UNAVAILABLE;
  		}
  
  		assert( rs->sr_entry != NULL );
  		assert( rs->sr_entry->e_private != NULL );
  
  		eid = (backsql_entryID *)rs->sr_entry->e_private;
  		assert( eid->eid_oc != NULL );
  		if ( eid->eid_oc == NULL || eid->eid_oc->bom_delete_proc == NULL ) {
  			btd->btd_rc = LDAP_UNWILLING_TO_PERFORM;
  			return rs->sr_err = LDAP_UNAVAILABLE;
  		}
  
  		eid = backsql_entryID_dup( eid, op->o_tmpmemctx );
  		eid->eid_next = btd->btd_eid;
  		btd->btd_eid = eid;
  	}
  
  	return 0;
  }
  
  static int
  backsql_tree_delete(
  	Operation	*op,
  	SlapReply	*rs,
  	SQLHDBC		dbh,
  	SQLHSTMT	*sthp )
  {
  	Operation		op2 = *op;
  	slap_callback		sc = { 0 };
  	SlapReply		rs2 = { 0 };
  	backsql_tree_delete_t	btd = { 0 };
  
  	int			rc;
  
  	/*
  	 * - perform an internal subtree search as the rootdn
  	 * - for each entry
  	 *	- check access
  	 *	- check objectClass and delete method(s)
  	 * - for each entry
  	 *	- delete
  	 * - if successful, commit
  	 */
  
  	op2.o_tag = LDAP_REQ_SEARCH;
  	op2.o_protocol = LDAP_VERSION3;
  
  	btd.btd_op = op;
  	sc.sc_private = &btd;
  	sc.sc_response = backsql_tree_delete_search_cb;
  	op2.o_callback = &sc;
  
  	op2.o_dn = op->o_bd->be_rootdn;
  	op2.o_ndn = op->o_bd->be_rootndn;
  
  	op2.o_managedsait = SLAP_CONTROL_CRITICAL;
  
  	op2.ors_scope = LDAP_SCOPE_SUBTREE;
  	op2.ors_deref = LDAP_DEREF_NEVER;
  	op2.ors_slimit = SLAP_NO_LIMIT;
  	op2.ors_tlimit = SLAP_NO_LIMIT;
  	op2.ors_filter = (Filter *)slap_filter_objectClass_pres;
  	op2.ors_filterstr = *slap_filterstr_objectClass_pres;
  	op2.ors_attrs = slap_anlist_all_attributes;
  	op2.ors_attrsonly = 0;
  
  	rc = op->o_bd->be_search( &op2, &rs2 );
  	if ( rc != LDAP_SUCCESS ) {
  		rc = rs->sr_err = btd.btd_rc;
  		rs->sr_text = "subtree delete not possible";
  		send_ldap_result( op, rs );
  		goto clean;
  	}
  
  	for ( ; btd.btd_eid != NULL;
  		btd.btd_eid = backsql_free_entryID( btd.btd_eid,
  			1, op->o_tmpmemctx ) )
  	{
  		Entry	*e = (void *)0xbad;
  		rc = backsql_delete_int( op, rs, dbh, sthp, btd.btd_eid, &e );
  		if ( rc != LDAP_SUCCESS ) {
  			break;
  		}
  	}
  
  clean:;
  	for ( ; btd.btd_eid != NULL;
  		btd.btd_eid = backsql_free_entryID( btd.btd_eid,
  			1, op->o_tmpmemctx ) )
  		;
  
  	return rc;
  }
  
  int
  backsql_delete( Operation *op, SlapReply *rs )
  {
  	SQLHDBC 		dbh = SQL_NULL_HDBC;
  	SQLHSTMT		sth = SQL_NULL_HSTMT;
  	backsql_oc_map_rec	*oc = NULL;
  	backsql_srch_info	bsi = { 0 };
  	backsql_entryID		e_id = { 0 };
  	Entry			d = { 0 }, p = { 0 }, *e = NULL;
  	struct berval		pdn = BER_BVNULL;
  	int			manageDSAit = get_manageDSAit( op );
  
  	Debug( LDAP_DEBUG_TRACE, "==>backsql_delete(): deleting entry \"%s\"\n",
  			op->o_req_ndn.bv_val, 0, 0 );
  
  	rs->sr_err = backsql_get_db_conn( op, &dbh );
  	if ( rs->sr_err != LDAP_SUCCESS ) {
  		Debug( LDAP_DEBUG_TRACE, "   backsql_delete(): "
  			"could not get connection handle - exiting\n", 
  			0, 0, 0 );
  		rs->sr_text = ( rs->sr_err == LDAP_OTHER )
  			? "SQL-backend error" : NULL;
  		e = NULL;
  		goto done;
  	}
  
  	/*
  	 * Get the entry
  	 */
  	bsi.bsi_e = &d;
  	rs->sr_err = backsql_init_search( &bsi, &op->o_req_ndn,
  			LDAP_SCOPE_BASE, 
  			(time_t)(-1), NULL, dbh, op, rs, slap_anlist_no_attrs,
  			( BACKSQL_ISF_MATCHED | BACKSQL_ISF_GET_ENTRY | BACKSQL_ISF_GET_OC ) );
  	switch ( rs->sr_err ) {
  	case LDAP_SUCCESS:
  		break;
  
  	case LDAP_REFERRAL:
  		if ( manageDSAit && !BER_BVISNULL( &bsi.bsi_e->e_nname ) &&
  				dn_match( &op->o_req_ndn, &bsi.bsi_e->e_nname ) )
  		{
  			rs->sr_err = LDAP_SUCCESS;
  			rs->sr_text = NULL;
  			rs->sr_matched = NULL;
  			if ( rs->sr_ref ) {
  				ber_bvarray_free( rs->sr_ref );
  				rs->sr_ref = NULL;
  			}
  			break;
  		}
  		e = &d;
  		/* fallthru */
  
  	default:
  		Debug( LDAP_DEBUG_TRACE, "backsql_delete(): "
  			"could not retrieve deleteDN ID - no such entry\n", 
  			0, 0, 0 );
  		if ( !BER_BVISNULL( &d.e_nname ) ) {
  			/* FIXME: should always be true! */
  			e = &d;
  
  		} else {
  			e = NULL;
  		}
  		goto done;
  	}
  
  	if ( get_assert( op ) &&
  			( test_filter( op, &d, get_assertion( op ) )
  			  != LDAP_COMPARE_TRUE ) )
  	{
  		rs->sr_err = LDAP_ASSERTION_FAILED;
  		e = &d;
  		goto done;
  	}
  
  	if ( !access_allowed( op, &d, slap_schema.si_ad_entry, 
  			NULL, ACL_WDEL, NULL ) )
  	{
  		Debug( LDAP_DEBUG_TRACE, "   backsql_delete(): "
  			"no write access to entry\n", 
  			0, 0, 0 );
  		rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
  		e = &d;
  		goto done;
  	}
  
  	rs->sr_err = backsql_has_children( op, dbh, &op->o_req_ndn );
  	switch ( rs->sr_err ) {
  	case LDAP_COMPARE_FALSE:
  		rs->sr_err = LDAP_SUCCESS;
  		break;
  
  	case LDAP_COMPARE_TRUE:
  #ifdef SLAP_CONTROL_X_TREE_DELETE
  		if ( get_treeDelete( op ) ) {
  			rs->sr_err = LDAP_SUCCESS;
  			break;
  		}
  #endif /* SLAP_CONTROL_X_TREE_DELETE */
  
  		Debug( LDAP_DEBUG_TRACE, "   backsql_delete(): "
  			"entry \"%s\" has children\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";
  		/* fallthru */
  
  	default:
  		e = &d;
  		goto done;
  	}
  
  	assert( bsi.bsi_base_id.eid_oc != NULL );
  	oc = bsi.bsi_base_id.eid_oc;
  	if ( oc->bom_delete_proc == NULL ) {
  		Debug( LDAP_DEBUG_TRACE, "   backsql_delete(): "
  			"delete procedure is not defined "
  			"for this objectclass - aborting\n", 0, 0, 0 );
  		rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
  		rs->sr_text = "operation not permitted within namingContext";
  		e = NULL;
  		goto done;
  	}
  
  	/*
  	 * Get the parent
  	 */
  	e_id = bsi.bsi_base_id;
  	memset( &bsi.bsi_base_id, 0, sizeof( bsi.bsi_base_id ) );
  	if ( !be_issuffix( op->o_bd, &op->o_req_ndn ) ) {
  		dnParent( &op->o_req_ndn, &pdn );
  		bsi.bsi_e = &p;
  		rs->sr_err = backsql_init_search( &bsi, &pdn,
  				LDAP_SCOPE_BASE, 
  				(time_t)(-1), NULL, dbh, op, rs,
  				slap_anlist_no_attrs,
  				BACKSQL_ISF_GET_ENTRY );
  		if ( rs->sr_err != LDAP_SUCCESS ) {
  			Debug( LDAP_DEBUG_TRACE, "backsql_delete(): "
  				"could not retrieve deleteDN ID "
  				"- no such entry\n", 
  				0, 0, 0 );
  			e = &p;
  			goto done;
  		}
  
  		(void)backsql_free_entryID( &bsi.bsi_base_id, 0, op->o_tmpmemctx );
  
  		/* check parent for "children" acl */
  		if ( !access_allowed( op, &p, slap_schema.si_ad_children, 
  				NULL, ACL_WDEL, NULL ) )
  		{
  			Debug( LDAP_DEBUG_TRACE, "   backsql_delete(): "
  				"no write access to parent\n", 
  				0, 0, 0 );
  			rs->sr_err = LDAP_INSUFFICIENT_ACCESS;
  			e = &p;
  			goto done;
  
  		}
  	}
  
  	e = &d;
  #ifdef SLAP_CONTROL_X_TREE_DELETE
  	if ( get_treeDelete( op ) ) {
  		backsql_tree_delete( op, rs, dbh, &sth );
  		if ( rs->sr_err == LDAP_OTHER || rs->sr_err == LDAP_SUCCESS )
  		{
  			e = NULL;
  		}
  
  	} else
  #endif /* SLAP_CONTROL_X_TREE_DELETE */
  	{
  		backsql_delete_int( op, rs, dbh, &sth, &e_id, &e );
  	}
  
  	/*
  	 * Commit only if all operations succeed
  	 */
  	if ( sth != SQL_NULL_HSTMT ) {
  		SQLUSMALLINT	CompletionType = SQL_ROLLBACK;
  	
  		if ( rs->sr_err == LDAP_SUCCESS && !op->o_noop ) {
  			assert( e == NULL );
  			CompletionType = SQL_COMMIT;
  		}
  
  		SQLTransact( SQL_NULL_HENV, dbh, CompletionType );
  	}
  
  done:;
  	if ( e != NULL ) {
  		if ( !access_allowed( op, e, slap_schema.si_ad_entry, NULL,
  					ACL_DISCLOSE, NULL ) )
  		{
  			rs->sr_err = LDAP_NO_SUCH_OBJECT;
  			rs->sr_text = NULL;
  			rs->sr_matched = NULL;
  			if ( rs->sr_ref ) {
  				ber_bvarray_free( rs->sr_ref );
  				rs->sr_ref = NULL;
  			}
  		}
  	}
  
  	if ( op->o_noop && rs->sr_err == LDAP_SUCCESS ) {
  		rs->sr_err = LDAP_X_NO_OPERATION;
  	}
  
  	send_ldap_result( op, rs );
  
  	Debug( LDAP_DEBUG_TRACE, "<==backsql_delete()\n", 0, 0, 0 );
  
  	if ( !BER_BVISNULL( &e_id.eid_ndn ) ) {
  		(void)backsql_free_entryID( &e_id, 0, op->o_tmpmemctx );
  	}
  
  	if ( !BER_BVISNULL( &d.e_nname ) ) {
  		backsql_entry_clean( op, &d );
  	}
  
  	if ( !BER_BVISNULL( &p.e_nname ) ) {
  		backsql_entry_clean( op, &p );
  	}
  
  	if ( rs->sr_ref ) {
  		ber_bvarray_free( rs->sr_ref );
  		rs->sr_ref = NULL;
  	}
  
  	return rs->sr_err;
  }
  
  