1 files changed, 605 insertions, 0 deletions

diff --git a/servers/slapd/back-bdb/delete.c b/servers/slapd/back-bdb/delete.c
new file mode 100644
index 0000000..11fd8b2
--- /dev/null
+++ b/servers/slapd/back-bdb/delete.c
@@ -0,0 +1,605 @@
+/* delete.c - bdb backend delete routine */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2000-2018 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-bdb.h"
+
+int
+bdb_delete( Operation *op, SlapReply *rs )
+{
+	struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
+	Entry	*matched = NULL;
+	struct berval	pdn = {0, NULL};
+	Entry	*e = NULL;
+	Entry	*p = NULL;
+	EntryInfo	*ei = NULL, *eip = NULL;
+	int		manageDSAit = get_manageDSAit( op );
+	AttributeDescription *children = slap_schema.si_ad_children;
+	AttributeDescription *entry = slap_schema.si_ad_entry;
+	DB_TXN		*ltid = NULL, *lt2;
+	struct bdb_op_info opinfo = {{{ 0 }}};
+	ID	eid;
+
+	DB_LOCK		lock, plock;
+
+	int		num_retries = 0;
+
+	int     rc;
+
+	LDAPControl **preread_ctrl = NULL;
+	LDAPControl *ctrls[SLAP_MAX_RESPONSE_CONTROLS];
+	int num_ctrls = 0;
+
+	int	parent_is_glue = 0;
+	int parent_is_leaf = 0;
+
+#ifdef LDAP_X_TXN
+	int settle = 0;
+#endif
+
+	Debug( LDAP_DEBUG_ARGS, "==> " LDAP_XSTRING(bdb_delete) ": %s\n",
+		op->o_req_dn.bv_val, 0, 0 );
+
+#ifdef LDAP_X_TXN
+	if( op->o_txnSpec ) {
+		/* acquire connection lock */
+		ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+		if( op->o_conn->c_txn == CONN_TXN_INACTIVE ) {
+			rs->sr_text = "invalid transaction identifier";
+			rs->sr_err = LDAP_X_TXN_ID_INVALID;
+			goto txnReturn;
+		} else if( op->o_conn->c_txn == CONN_TXN_SETTLE ) {
+			settle=1;
+			goto txnReturn;
+		}
+
+		if( op->o_conn->c_txn_backend == NULL ) {
+			op->o_conn->c_txn_backend = op->o_bd;
+
+		} else if( op->o_conn->c_txn_backend != op->o_bd ) {
+			rs->sr_text = "transaction cannot span multiple database contexts";
+			rs->sr_err = LDAP_AFFECTS_MULTIPLE_DSAS;
+			goto txnReturn;
+		}
+
+		/* insert operation into transaction */
+
+		rs->sr_text = "transaction specified";
+		rs->sr_err = LDAP_X_TXN_SPECIFY_OKAY;
+
+txnReturn:
+		/* release connection lock */
+		ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+
+		if( !settle ) {
+			send_ldap_result( op, rs );
+			return rs->sr_err;
+		}
+	}
+#endif
+
+	ctrls[num_ctrls] = 0;
+
+	/* 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( 0 ) {
+retry:	/* transaction retry */
+		if( e != NULL ) {
+			bdb_unlocked_cache_return_entry_w(&bdb->bi_cache, e);
+			e = NULL;
+		}
+		if( p != NULL ) {
+			bdb_unlocked_cache_return_entry_r(&bdb->bi_cache, p);
+			p = NULL;
+		}
+		Debug( LDAP_DEBUG_TRACE,
+			"==> " LDAP_XSTRING(bdb_delete) ": retrying...\n",
+			0, 0, 0 );
+		rs->sr_err = TXN_ABORT( ltid );
+		ltid = NULL;
+		LDAP_SLIST_REMOVE( &op->o_extra, &opinfo.boi_oe, OpExtra, oe_next );
+		opinfo.boi_oe.oe_key = NULL;
+		op->o_do_not_cache = opinfo.boi_acl_cache;
+		if( rs->sr_err != 0 ) {
+			rs->sr_err = LDAP_OTHER;
+			rs->sr_text = "internal error";
+			goto return_results;
+		}
+		if ( op->o_abandon ) {
+			rs->sr_err = SLAPD_ABANDON;
+			goto return_results;
+		}
+		parent_is_glue = 0;
+		parent_is_leaf = 0;
+		bdb_trans_backoff( ++num_retries );
+	}
+
+	/* begin transaction */
+	rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, NULL, &ltid, 
+		bdb->bi_db_opflags );
+	Debug( LDAP_DEBUG_TRACE, LDAP_XSTRING(bdb_delete) ": txn1 id: %x\n",
+		ltid->id(ltid), 0, 0 );
+	rs->sr_text = NULL;
+	if( rs->sr_err != 0 ) {
+		Debug( LDAP_DEBUG_TRACE,
+			LDAP_XSTRING(bdb_delete) ": txn_begin failed: "
+			"%s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
+		rs->sr_err = LDAP_OTHER;
+		rs->sr_text = "internal error";
+		goto return_results;
+	}
+
+	opinfo.boi_oe.oe_key = bdb;
+	opinfo.boi_txn = ltid;
+	opinfo.boi_err = 0;
+	opinfo.boi_acl_cache = op->o_do_not_cache;
+	LDAP_SLIST_INSERT_HEAD( &op->o_extra, &opinfo.boi_oe, oe_next );
+
+	if ( !be_issuffix( op->o_bd, &op->o_req_ndn ) ) {
+		dnParent( &op->o_req_ndn, &pdn );
+	}
+
+	/* get entry */
+	rs->sr_err = bdb_dn2entry( op, ltid, &op->o_req_ndn, &ei, 1,
+		&lock );
+
+	switch( rs->sr_err ) {
+	case 0:
+	case DB_NOTFOUND:
+		break;
+	case DB_LOCK_DEADLOCK:
+	case DB_LOCK_NOTGRANTED:
+		goto retry;
+	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 == 0 ) {
+		e = ei->bei_e;
+		eip = ei->bei_parent;
+	} else {
+		matched = ei->bei_e;
+	}
+
+	/* FIXME : dn2entry() should return non-glue entry */
+	if ( e == NULL || ( !manageDSAit && is_entry_glue( e ))) {
+		Debug( LDAP_DEBUG_ARGS,
+			"<=- " LDAP_XSTRING(bdb_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;
+			bdb_unlocked_cache_return_entry_r(&bdb->bi_cache, matched);
+			matched = NULL;
+
+		} 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;
+	}
+
+	rc = bdb_cache_find_id( op, ltid, eip->bei_id, &eip, 0, &plock );
+	switch( rc ) {
+	case DB_LOCK_DEADLOCK:
+	case DB_LOCK_NOTGRANTED:
+		goto retry;
+	case 0:
+	case DB_NOTFOUND:
+		break;
+	default:
+		rs->sr_err = LDAP_OTHER;
+		rs->sr_text = "internal error";
+		goto return_results;
+	}
+	if ( eip ) p = eip->bei_e;
+
+	if ( pdn.bv_len != 0 ) {
+		if( p == NULL || !bvmatch( &pdn, &p->e_nname )) {
+			Debug( LDAP_DEBUG_TRACE,
+				"<=- " LDAP_XSTRING(bdb_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 */
+		rs->sr_err = access_allowed( op, p,
+			children, NULL, ACL_WDEL, NULL );
+
+		if ( !rs->sr_err  ) {
+			switch( opinfo.boi_err ) {
+			case DB_LOCK_DEADLOCK:
+			case DB_LOCK_NOTGRANTED:
+				goto retry;
+			}
+
+			Debug( LDAP_DEBUG_TRACE,
+				"<=- " LDAP_XSTRING(bdb_delete) ": no write "
+				"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;
+
+				/* check parent for "children" acl */
+				rs->sr_err = access_allowed( op, p,
+					children, NULL, ACL_WDEL, NULL );
+
+				p = NULL;
+
+				if ( !rs->sr_err  ) {
+					switch( opinfo.boi_err ) {
+					case DB_LOCK_DEADLOCK:
+					case DB_LOCK_NOTGRANTED:
+						goto retry;
+					}
+
+					Debug( LDAP_DEBUG_TRACE,
+						"<=- " LDAP_XSTRING(bdb_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,
+					"<=- " LDAP_XSTRING(bdb_delete)
+					": no parent and not root\n", 0, 0, 0 );
+				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  ) {
+		switch( opinfo.boi_err ) {
+		case DB_LOCK_DEADLOCK:
+		case DB_LOCK_NOTGRANTED:
+			goto retry;
+		}
+
+		Debug( LDAP_DEBUG_TRACE,
+			"<=- " LDAP_XSTRING(bdb_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 ) ) {
+		/* entry is a referral, don't allow delete */
+		rs->sr_ref = get_entry_referrals( op, e );
+
+		Debug( LDAP_DEBUG_TRACE,
+			LDAP_XSTRING(bdb_delete) ": 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;
+	}
+
+	/* 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(bdb_delete) ": pre-read "
+				"failed!\n", 0, 0, 0 );
+			if ( op->o_preread & SLAP_CONTROL_CRITICAL ) {
+				/* FIXME: is it correct to abort
+				 * operation if control fails? */
+				goto return_results;
+			}
+		}
+	}
+
+	/* nested transaction */
+	rs->sr_err = TXN_BEGIN( bdb->bi_dbenv, ltid, &lt2, 
+		bdb->bi_db_opflags );
+	rs->sr_text = NULL;
+	if( rs->sr_err != 0 ) {
+		Debug( LDAP_DEBUG_TRACE,
+			LDAP_XSTRING(bdb_delete) ": txn_begin(2) failed: "
+			"%s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
+		rs->sr_err = LDAP_OTHER;
+		rs->sr_text = "internal error";
+		goto return_results;
+	}
+	Debug( LDAP_DEBUG_TRACE, LDAP_XSTRING(bdb_delete) ": txn2 id: %x\n",
+		lt2->id(lt2), 0, 0 );
+
+	BDB_LOG_PRINTF( bdb->bi_dbenv, lt2, "slapd Starting delete %s(%d)",
+		e->e_nname.bv_val, e->e_id );
+
+	/* Can't do it if we have kids */
+	rs->sr_err = bdb_cache_children( op, lt2, e );
+	if( rs->sr_err != DB_NOTFOUND ) {
+		switch( rs->sr_err ) {
+		case DB_LOCK_DEADLOCK:
+		case DB_LOCK_NOTGRANTED:
+			goto retry;
+		case 0:
+			Debug(LDAP_DEBUG_ARGS,
+				"<=- " LDAP_XSTRING(bdb_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";
+			break;
+		default:
+			Debug(LDAP_DEBUG_ARGS,
+				"<=- " LDAP_XSTRING(bdb_delete)
+				": has_children failed: %s (%d)\n",
+				db_strerror(rs->sr_err), rs->sr_err, 0 );
+			rs->sr_err = LDAP_OTHER;
+			rs->sr_text = "internal error";
+		}
+		goto return_results;
+	}
+
+	/* delete from dn2id */
+	rs->sr_err = bdb_dn2id_delete( op, lt2, eip, e );
+	if ( rs->sr_err != 0 ) {
+		Debug(LDAP_DEBUG_TRACE,
+			"<=- " LDAP_XSTRING(bdb_delete) ": dn2id failed: "
+			"%s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
+		switch( rs->sr_err ) {
+		case DB_LOCK_DEADLOCK:
+		case DB_LOCK_NOTGRANTED:
+			goto retry;
+		}
+		rs->sr_text = "DN index delete failed";
+		rs->sr_err = LDAP_OTHER;
+		goto return_results;
+	}
+
+	/* delete indices for old attributes */
+	rs->sr_err = bdb_index_entry_del( op, lt2, e );
+	if ( rs->sr_err != LDAP_SUCCESS ) {
+		Debug(LDAP_DEBUG_TRACE,
+			"<=- " LDAP_XSTRING(bdb_delete) ": index failed: "
+			"%s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
+		switch( rs->sr_err ) {
+		case DB_LOCK_DEADLOCK:
+		case DB_LOCK_NOTGRANTED:
+			goto retry;
+		}
+		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 = bdb_index_values( op, lt2, slap_schema.si_ad_entryCSN,
+			vals, 0, SLAP_INDEX_ADD_OP );
+	if ( rs->sr_err != LDAP_SUCCESS ) {
+			switch( rs->sr_err ) {
+			case DB_LOCK_DEADLOCK:
+			case DB_LOCK_NOTGRANTED:
+				goto retry;
+			}
+			rs->sr_text = "entryCSN index update failed";
+			rs->sr_err = LDAP_OTHER;
+			goto return_results;
+		}
+	}
+
+	/* delete from id2entry */
+	rs->sr_err = bdb_id2entry_delete( op->o_bd, lt2, e );
+	if ( rs->sr_err != 0 ) {
+		Debug( LDAP_DEBUG_TRACE,
+			"<=- " LDAP_XSTRING(bdb_delete) ": id2entry failed: "
+			"%s (%d)\n", db_strerror(rs->sr_err), rs->sr_err, 0 );
+		switch( rs->sr_err ) {
+		case DB_LOCK_DEADLOCK:
+		case DB_LOCK_NOTGRANTED:
+			goto retry;
+		}
+		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 = bdb_cache_children( op, lt2, p );
+		if ( rs->sr_err != DB_NOTFOUND ) {
+			switch( rs->sr_err ) {
+			case DB_LOCK_DEADLOCK:
+			case DB_LOCK_NOTGRANTED:
+				goto retry;
+			case 0:
+				break;
+			default:
+				Debug(LDAP_DEBUG_ARGS,
+					"<=- " LDAP_XSTRING(bdb_delete)
+					": has_children failed: %s (%d)\n",
+					db_strerror(rs->sr_err), rs->sr_err, 0 );
+				rs->sr_err = LDAP_OTHER;
+				rs->sr_text = "internal error";
+				goto return_results;
+			}
+			parent_is_leaf = 1;
+		}
+		bdb_unlocked_cache_return_entry_r(&bdb->bi_cache, p);
+		p = NULL;
+	}
+
+	BDB_LOG_PRINTF( bdb->bi_dbenv, lt2, "slapd Commit1 delete %s(%d)",
+		e->e_nname.bv_val, e->e_id );
+
+	if ( TXN_COMMIT( lt2, 0 ) != 0 ) {
+		rs->sr_err = LDAP_OTHER;
+		rs->sr_text = "txn_commit(2) failed";
+		goto return_results;
+	}
+
+	eid = e->e_id;
+
+#if 0	/* Do we want to reclaim deleted IDs? */
+	ldap_pvt_thread_mutex_lock( &bdb->bi_lastid_mutex );
+	if ( e->e_id == bdb->bi_lastid ) {
+		bdb_last_id( op->o_bd, ltid );
+	}
+	ldap_pvt_thread_mutex_unlock( &bdb->bi_lastid_mutex );
+#endif
+
+	if( op->o_noop ) {
+		if ( ( rs->sr_err = TXN_ABORT( ltid ) ) != 0 ) {
+			rs->sr_text = "txn_abort (no-op) failed";
+		} else {
+			rs->sr_err = LDAP_X_NO_OPERATION;
+			ltid = NULL;
+			goto return_results;
+		}
+	} else {
+
+		BDB_LOG_PRINTF( bdb->bi_dbenv, ltid, "slapd Cache delete %s(%d)",
+			e->e_nname.bv_val, e->e_id );
+
+		rc = bdb_cache_delete( bdb, e, ltid, &lock );
+		switch( rc ) {
+		case DB_LOCK_DEADLOCK:
+		case DB_LOCK_NOTGRANTED:
+			goto retry;
+		}
+
+		rs->sr_err = TXN_COMMIT( ltid, 0 );
+	}
+	ltid = NULL;
+	LDAP_SLIST_REMOVE( &op->o_extra, &opinfo.boi_oe, OpExtra, oe_next );
+	opinfo.boi_oe.oe_key = NULL;
+
+	BDB_LOG_PRINTF( bdb->bi_dbenv, NULL, "slapd Committed delete %s(%d)",
+		e->e_nname.bv_val, e->e_id );
+
+	if( rs->sr_err != 0 ) {
+		Debug( LDAP_DEBUG_TRACE,
+			LDAP_XSTRING(bdb_delete) ": txn_%s failed: %s (%d)\n",
+			op->o_noop ? "abort (no-op)" : "commit",
+			db_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(bdb_delete) ": deleted%s id=%08lx dn=\"%s\"\n",
+		op->o_noop ? " (no-op)" : "",
+		eid, 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 )
+		bdb_unlocked_cache_return_entry_r(&bdb->bi_cache, p);
+
+	/* free entry */
+	if( e != NULL ) {
+		if ( rs->sr_err == LDAP_SUCCESS ) {
+			/* Free the EntryInfo and the Entry */
+			bdb_cache_entryinfo_lock( BEI(e) );
+			bdb_cache_delete_cleanup( &bdb->bi_cache, BEI(e) );
+		} else {
+			bdb_unlocked_cache_return_entry_w(&bdb->bi_cache, e);
+		}
+	}
+
+	if( ltid != NULL ) {
+		TXN_ABORT( ltid );
+	}
+	if ( opinfo.boi_oe.oe_key ) {
+		LDAP_SLIST_REMOVE( &op->o_extra, &opinfo.boi_oe, OpExtra, oe_next );
+	}
+
+	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( rs->sr_err == LDAP_SUCCESS && bdb->bi_txn_cp_kbyte ) {
+		TXN_CHECKPOINT( bdb->bi_dbenv,
+			bdb->bi_txn_cp_kbyte, bdb->bi_txn_cp_min, 0 );
+	}
+	return rs->sr_err;
+}