Adding upstream version 2.4.57+dfsg.upstream/2.4.57+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 446 insertions, 0 deletions

diff --git a/servers/slapd/back-bdb/id2entry.c b/servers/slapd/back-bdb/id2entry.c
new file mode 100644
index 0000000..d0e76ab
--- /dev/null
+++ b/servers/slapd/back-bdb/id2entry.c
@@ -0,0 +1,446 @@
+/* id2entry.c - routines to deal with the id2entry database */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2000-2021 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/errno.h>
+
+#include "back-bdb.h"
+
+static int bdb_id2entry_put(
+	BackendDB *be,
+	DB_TXN *tid,
+	Entry *e,
+	int flag )
+{
+	struct bdb_info *bdb = (struct bdb_info *) be->be_private;
+	DB *db = bdb->bi_id2entry->bdi_db;
+	DBT key, data;
+	struct berval bv;
+	int rc;
+	ID nid;
+#ifdef BDB_HIER
+	struct berval odn, ondn;
+
+	/* We only store rdns, and they go in the dn2id database. */
+
+	odn = e->e_name; ondn = e->e_nname;
+
+	e->e_name = slap_empty_bv;
+	e->e_nname = slap_empty_bv;
+#endif
+	DBTzero( &key );
+
+	/* Store ID in BigEndian format */
+	key.data = &nid;
+	key.size = sizeof(ID);
+	BDB_ID2DISK( e->e_id, &nid );
+
+	rc = entry_encode( e, &bv );
+#ifdef BDB_HIER
+	e->e_name = odn; e->e_nname = ondn;
+#endif
+	if( rc != LDAP_SUCCESS ) {
+		return -1;
+	}
+
+	DBTzero( &data );
+	bv2DBT( &bv, &data );
+
+	rc = db->put( db, tid, &key, &data, flag );
+
+	free( bv.bv_val );
+	return rc;
+}
+
+/*
+ * This routine adds (or updates) an entry on disk.
+ * The cache should be already be updated.
+ */
+
+
+int bdb_id2entry_add(
+	BackendDB *be,
+	DB_TXN *tid,
+	Entry *e )
+{
+	return bdb_id2entry_put(be, tid, e, DB_NOOVERWRITE);
+}
+
+int bdb_id2entry_update(
+	BackendDB *be,
+	DB_TXN *tid,
+	Entry *e )
+{
+	return bdb_id2entry_put(be, tid, e, 0);
+}
+
+int bdb_id2entry(
+	BackendDB *be,
+	DB_TXN *tid,
+	ID id,
+	Entry **e )
+{
+	struct bdb_info *bdb = (struct bdb_info *) be->be_private;
+	DB *db = bdb->bi_id2entry->bdi_db;
+	DBT key, data;
+	DBC *cursor;
+	EntryHeader eh;
+	char buf[16];
+	int rc = 0, off;
+	ID nid;
+
+	*e = NULL;
+
+	DBTzero( &key );
+	key.data = &nid;
+	key.size = sizeof(ID);
+	BDB_ID2DISK( id, &nid );
+
+	DBTzero( &data );
+	data.flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;
+
+	/* fetch it */
+	rc = db->cursor( db, tid, &cursor, bdb->bi_db_opflags );
+	if ( rc ) return rc;
+
+	/* Get the nattrs / nvals counts first */
+	data.ulen = data.dlen = sizeof(buf);
+	data.data = buf;
+	rc = cursor->c_get( cursor, &key, &data, DB_SET );
+	if ( rc ) goto finish;
+
+
+	eh.bv.bv_val = buf;
+	eh.bv.bv_len = data.size;
+	rc = entry_header( &eh );
+	if ( rc ) goto finish;
+
+	if ( eh.nvals ) {
+		/* Get the size */
+		data.flags ^= DB_DBT_PARTIAL;
+		data.ulen = 0;
+		rc = cursor->c_get( cursor, &key, &data, DB_CURRENT );
+		if ( rc != DB_BUFFER_SMALL ) goto finish;
+
+		/* Allocate a block and retrieve the data */
+		off = eh.data - eh.bv.bv_val;
+		eh.bv.bv_len = eh.nvals * sizeof( struct berval ) + data.size;
+		eh.bv.bv_val = ch_malloc( eh.bv.bv_len );
+		eh.data = eh.bv.bv_val + eh.nvals * sizeof( struct berval );
+		data.data = eh.data;
+		data.ulen = data.size;
+
+		/* skip past already parsed nattr/nvals */
+		eh.data += off;
+
+		rc = cursor->c_get( cursor, &key, &data, DB_CURRENT );
+	}
+
+finish:
+	cursor->c_close( cursor );
+
+	if( rc != 0 ) {
+		return rc;
+	}
+
+	if ( eh.nvals ) {
+#ifdef SLAP_ZONE_ALLOC
+		rc = entry_decode(&eh, e, bdb->bi_cache.c_zctx);
+#else
+		rc = entry_decode(&eh, e);
+#endif
+	} else {
+		*e = entry_alloc();
+	}
+
+	if( rc == 0 ) {
+		(*e)->e_id = id;
+	} else {
+		/* only free on error. On success, the entry was
+		 * decoded in place.
+		 */
+#ifndef SLAP_ZONE_ALLOC
+		ch_free(eh.bv.bv_val);
+#endif
+	}
+#ifdef SLAP_ZONE_ALLOC
+	ch_free(eh.bv.bv_val);
+#endif
+
+	return rc;
+}
+
+int bdb_id2entry_delete(
+	BackendDB *be,
+	DB_TXN *tid,
+	Entry *e )
+{
+	struct bdb_info *bdb = (struct bdb_info *) be->be_private;
+	DB *db = bdb->bi_id2entry->bdi_db;
+	DBT key;
+	int rc;
+	ID nid;
+
+	DBTzero( &key );
+	key.data = &nid;
+	key.size = sizeof(ID);
+	BDB_ID2DISK( e->e_id, &nid );
+
+	/* delete from database */
+	rc = db->del( db, tid, &key, 0 );
+
+	return rc;
+}
+
+int bdb_entry_return(
+	Entry *e
+)
+{
+	/* Our entries are allocated in two blocks; the data comes from
+	 * the db itself and the Entry structure and associated pointers
+	 * are allocated in entry_decode. The db data pointer is saved
+	 * in e_bv.
+	 */
+	if ( e->e_bv.bv_val ) {
+		/* See if the DNs were changed by modrdn */
+		if( e->e_nname.bv_val < e->e_bv.bv_val || e->e_nname.bv_val >
+			e->e_bv.bv_val + e->e_bv.bv_len ) {
+			ch_free(e->e_name.bv_val);
+			ch_free(e->e_nname.bv_val);
+		}
+		e->e_name.bv_val = NULL;
+		e->e_nname.bv_val = NULL;
+		/* In tool mode the e_bv buffer is realloc'd, leave it alone */
+		if( !(slapMode & SLAP_TOOL_MODE) ) {
+			free( e->e_bv.bv_val );
+		}
+		BER_BVZERO( &e->e_bv );
+	}
+	entry_free( e );
+	return 0;
+}
+
+int bdb_entry_release(
+	Operation *op,
+	Entry *e,
+	int rw )
+{
+	struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
+	struct bdb_op_info *boi;
+	OpExtra *oex;
+ 
+	/* slapMode : SLAP_SERVER_MODE, SLAP_TOOL_MODE,
+			SLAP_TRUNCATE_MODE, SLAP_UNDEFINED_MODE */
+ 
+	if ( slapMode & SLAP_SERVER_MODE ) {
+		/* If not in our cache, just free it */
+		if ( !e->e_private ) {
+#ifdef SLAP_ZONE_ALLOC
+			return bdb_entry_return( bdb, e, -1 );
+#else
+			return bdb_entry_return( e );
+#endif
+		}
+		/* free entry and reader or writer lock */
+		LDAP_SLIST_FOREACH( oex, &op->o_extra, oe_next ) {
+			if ( oex->oe_key == bdb ) break;
+		}
+		boi = (struct bdb_op_info *)oex;
+
+		/* lock is freed with txn */
+		if ( !boi || boi->boi_txn ) {
+			bdb_unlocked_cache_return_entry_rw( bdb, e, rw );
+		} else {
+			struct bdb_lock_info *bli, *prev;
+			for ( prev=(struct bdb_lock_info *)&boi->boi_locks,
+				bli = boi->boi_locks; bli; prev=bli, bli=bli->bli_next ) {
+				if ( bli->bli_id == e->e_id ) {
+					bdb_cache_return_entry_rw( bdb, e, rw, &bli->bli_lock );
+					prev->bli_next = bli->bli_next;
+					/* Cleanup, or let caller know we unlocked */
+					if ( bli->bli_flag & BLI_DONTFREE )
+						bli->bli_flag = 0;
+					else
+						op->o_tmpfree( bli, op->o_tmpmemctx );
+					break;
+				}
+			}
+			if ( !boi->boi_locks ) {
+				LDAP_SLIST_REMOVE( &op->o_extra, &boi->boi_oe, OpExtra, oe_next );
+				if ( !(boi->boi_flag & BOI_DONTFREE))
+					op->o_tmpfree( boi, op->o_tmpmemctx );
+			}
+		}
+	} else {
+#ifdef SLAP_ZONE_ALLOC
+		int zseq = -1;
+		if (e->e_private != NULL) {
+			BEI(e)->bei_e = NULL;
+			zseq = BEI(e)->bei_zseq;
+		}
+#else
+		if (e->e_private != NULL)
+			BEI(e)->bei_e = NULL;
+#endif
+		e->e_private = NULL;
+#ifdef SLAP_ZONE_ALLOC
+		bdb_entry_return ( bdb, e, zseq );
+#else
+		bdb_entry_return ( e );
+#endif
+	}
+ 
+	return 0;
+}
+
+/* return LDAP_SUCCESS IFF we can retrieve the specified entry.
+ */
+int bdb_entry_get(
+	Operation *op,
+	struct berval *ndn,
+	ObjectClass *oc,
+	AttributeDescription *at,
+	int rw,
+	Entry **ent )
+{
+	struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
+	struct bdb_op_info *boi = NULL;
+	DB_TXN *txn = NULL;
+	Entry *e = NULL;
+	EntryInfo *ei;
+	int	rc;
+	const char *at_name = at ? at->ad_cname.bv_val : "(null)";
+
+	DB_LOCK		lock;
+
+	Debug( LDAP_DEBUG_ARGS,
+		"=> bdb_entry_get: ndn: \"%s\"\n", ndn->bv_val, 0, 0 ); 
+	Debug( LDAP_DEBUG_ARGS,
+		"=> bdb_entry_get: oc: \"%s\", at: \"%s\"\n",
+		oc ? oc->soc_cname.bv_val : "(null)", at_name, 0);
+
+	if( op ) {
+		OpExtra *oex;
+		LDAP_SLIST_FOREACH( oex, &op->o_extra, oe_next ) {
+			if ( oex->oe_key == bdb ) break;
+		}
+		boi = (struct bdb_op_info *)oex;
+		if ( boi )
+			txn = boi->boi_txn;
+	}
+
+	if ( !txn ) {
+		rc = bdb_reader_get( op, bdb->bi_dbenv, &txn );
+		switch(rc) {
+		case 0:
+			break;
+		default:
+			return LDAP_OTHER;
+		}
+	}
+
+dn2entry_retry:
+	/* can we find entry */
+	rc = bdb_dn2entry( op, txn, ndn, &ei, 0, &lock );
+	switch( rc ) {
+	case DB_NOTFOUND:
+	case 0:
+		break;
+	case DB_LOCK_DEADLOCK:
+	case DB_LOCK_NOTGRANTED:
+		/* the txn must abort and retry */
+		if ( txn ) {
+			if ( boi ) boi->boi_err = rc;
+			return LDAP_BUSY;
+		}
+		ldap_pvt_thread_yield();
+		goto dn2entry_retry;
+	default:
+		if ( boi ) boi->boi_err = rc;
+		return (rc != LDAP_BUSY) ? LDAP_OTHER : LDAP_BUSY;
+	}
+	if (ei) e = ei->bei_e;
+	if (e == NULL) {
+		Debug( LDAP_DEBUG_ACL,
+			"=> bdb_entry_get: cannot find entry: \"%s\"\n",
+				ndn->bv_val, 0, 0 ); 
+		return LDAP_NO_SUCH_OBJECT; 
+	}
+	
+	Debug( LDAP_DEBUG_ACL,
+		"=> bdb_entry_get: found entry: \"%s\"\n",
+		ndn->bv_val, 0, 0 ); 
+
+	if ( oc && !is_entry_objectclass( e, oc, 0 )) {
+		Debug( LDAP_DEBUG_ACL,
+			"<= bdb_entry_get: failed to find objectClass %s\n",
+			oc->soc_cname.bv_val, 0, 0 ); 
+		rc = LDAP_NO_SUCH_ATTRIBUTE;
+		goto return_results;
+	}
+
+	/* NOTE: attr_find() or attrs_find()? */
+	if ( at && attr_find( e->e_attrs, at ) == NULL ) {
+		Debug( LDAP_DEBUG_ACL,
+			"<= bdb_entry_get: failed to find attribute %s\n",
+			at->ad_cname.bv_val, 0, 0 ); 
+		rc = LDAP_NO_SUCH_ATTRIBUTE;
+		goto return_results;
+	}
+
+return_results:
+	if( rc != LDAP_SUCCESS ) {
+		/* free entry */
+		bdb_cache_return_entry_rw(bdb, e, rw, &lock);
+
+	} else {
+		if ( slapMode & SLAP_SERVER_MODE ) {
+			*ent = e;
+			/* big drag. we need a place to store a read lock so we can
+			 * release it later?? If we're in a txn, nothing is needed
+			 * here because the locks will go away with the txn.
+			 */
+			if ( op ) {
+				if ( !boi ) {
+					boi = op->o_tmpcalloc(1,sizeof(struct bdb_op_info),op->o_tmpmemctx);
+					boi->boi_oe.oe_key = bdb;
+					LDAP_SLIST_INSERT_HEAD( &op->o_extra, &boi->boi_oe, oe_next );
+				}
+				if ( !boi->boi_txn ) {
+					struct bdb_lock_info *bli;
+					bli = op->o_tmpalloc( sizeof(struct bdb_lock_info),
+						op->o_tmpmemctx );
+					bli->bli_next = boi->boi_locks;
+					bli->bli_id = e->e_id;
+					bli->bli_flag = 0;
+					bli->bli_lock = lock;
+					boi->boi_locks = bli;
+				}
+			}
+		} else {
+			*ent = entry_dup( e );
+			bdb_cache_return_entry_rw(bdb, e, rw, &lock);
+		}
+	}
+
+	Debug( LDAP_DEBUG_TRACE,
+		"bdb_entry_get: rc=%d\n",
+		rc, 0, 0 ); 
+	return(rc);
+}