smbd/winbindd: Do an early check if ctdbd is functional

This will avoid panic calls when smbd and winbind is started in cluster
mode before ctdb is functional. It still logs something sane at debug
level 0, but it does not panic and core anymore.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/source3/lib/ctdbd_conn.c b/source3/lib/ctdbd_conn.c
index 70833cb91d..6ab4bbe704 100644
--- a/source3/lib/ctdbd_conn.c
+++ b/source3/lib/ctdbd_conn.c
@@ -1822,8 +1822,32 @@ NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
 	return status;
 }
 
+NTSTATUS ctdbd_probe(void)
+{
+	/*
+	 * Do a very early check if ctdbd is around to avoid an abort and core
+	 * later
+	 */
+	struct ctdbd_connection *conn = NULL;
+	NTSTATUS status;
+
+	status = ctdbd_messaging_connection(talloc_tos(), &conn);
+
+	/*
+	 * We only care if we can connect.
+	 */
+	TALLOC_FREE(conn);
+
+	return status;
+}
+
 #else
 
+NTSTATUS ctdbd_probe(void)
+{
+	return NT_STATUS_OK;
+}
+
 NTSTATUS ctdbd_messaging_send_blob(struct ctdbd_connection *conn,
 				   uint32_t dst_vnn, uint64_t dst_srvid,
 				   const uint8_t *buf, size_t buflen)