1 files changed, 143 insertions, 0 deletions
diff --git a/servers/slapd/back-bdb/compare.c b/servers/slapd/back-bdb/compare.c
new file mode 100644
index 0000000..adc4575
--- /dev/null
+++ b/servers/slapd/back-bdb/compare.c
@@ -0,0 +1,143 @@
+/* compare.c - bdb backend compare routine */
+/* $OpenLDAP$ */
+/* 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 "back-bdb.h"
+
+int
+bdb_compare( Operation *op, SlapReply *rs )
+{
+	struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private;
+	Entry		*e = NULL;
+	EntryInfo	*ei;
+	int		manageDSAit = get_manageDSAit( op );
+
+	DB_TXN		*rtxn;
+	DB_LOCK		lock;
+
+	rs->sr_err = bdb_reader_get(op, bdb->bi_dbenv, &rtxn);
+	switch(rs->sr_err) {
+	case 0:
+		break;
+	default:
+		send_ldap_error( op, rs, LDAP_OTHER, "internal error" );
+		return rs->sr_err;
+	}
+
+dn2entry_retry:
+	/* get entry */
+	rs->sr_err = bdb_dn2entry( op, rtxn, &op->o_req_ndn, &ei, 1,
+		&lock );
+
+	switch( rs->sr_err ) {
+	case DB_NOTFOUND:
+	case 0:
+		break;
+	case LDAP_BUSY:
+		rs->sr_text = "ldap server busy";
+		goto return_results;
+	case DB_LOCK_DEADLOCK:
+	case DB_LOCK_NOTGRANTED:
+		goto dn2entry_retry;
+	default:
+		rs->sr_err = LDAP_OTHER;
+		rs->sr_text = "internal error";
+		goto return_results;
+	}
+
+	e = ei->bei_e;
+	if ( rs->sr_err == DB_NOTFOUND ) {
+		if ( e != NULL ) {
+			/* return referral only if "disclose" is granted on the object */
+			if ( ! access_allowed( op, e, slap_schema.si_ad_entry,
+				NULL, ACL_DISCLOSE, NULL ) )
+			{
+				rs->sr_err = LDAP_NO_SUCH_OBJECT;
+
+			} else {
+				rs->sr_matched = ch_strdup( e->e_dn );
+				rs->sr_ref = is_entry_referral( e )
+					? get_entry_referrals( op, e )
+					: NULL;
+				rs->sr_err = LDAP_REFERRAL;
+			}
+
+			bdb_cache_return_entry_r( bdb, e, &lock );
+			e = NULL;
+
+		} else {
+			rs->sr_ref = referral_rewrite( default_referral,
+				NULL, &op->o_req_dn, LDAP_SCOPE_DEFAULT );
+			rs->sr_err = rs->sr_ref ? LDAP_REFERRAL : LDAP_NO_SUCH_OBJECT;
+		}
+
+		send_ldap_result( op, rs );
+
+		ber_bvarray_free( rs->sr_ref );
+		free( (char *)rs->sr_matched );
+		rs->sr_ref = NULL;
+		rs->sr_matched = NULL;
+
+		goto done;
+	}
+
+	if (!manageDSAit && is_entry_referral( e ) ) {
+		/* return referral only if "disclose" is granted on the object */
+		if ( !access_allowed( op, e, slap_schema.si_ad_entry,
+			NULL, ACL_DISCLOSE, NULL ) )
+		{
+			rs->sr_err = LDAP_NO_SUCH_OBJECT;
+		} else {
+			/* entry is a referral, don't allow compare */
+			rs->sr_ref = get_entry_referrals( op, e );
+			rs->sr_err = LDAP_REFERRAL;
+			rs->sr_matched = e->e_name.bv_val;
+		}
+
+		Debug( LDAP_DEBUG_TRACE, "entry is referral\n", 0, 0, 0 );
+
+		send_ldap_result( op, rs );
+
+		ber_bvarray_free( rs->sr_ref );
+		rs->sr_ref = NULL;
+		rs->sr_matched = NULL;
+		goto done;
+	}
+
+	rs->sr_err = slap_compare_entry( op, e, op->orc_ava );
+
+return_results:
+	send_ldap_result( op, rs );
+
+	switch ( rs->sr_err ) {
+	case LDAP_COMPARE_FALSE:
+	case LDAP_COMPARE_TRUE:
+		rs->sr_err = LDAP_SUCCESS;
+		break;
+	}
+
+done:
+	/* free entry */
+	if ( e != NULL ) {
+		bdb_cache_return_entry_r( bdb, e, &lock );
+	}
+
+	return rs->sr_err;
+}