Fancier protocol for control socket

* pass error status back
* pass message boundaries

src/control_common.h

@@ -0,0 +1,46 @@
+/*
+    control_protocol.h -- control socket protocol.
+    Copyright (C) 2007 Scott Lamb <slamb@slamb.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id$
+*/
+
+#ifndef __TINC_CONTROL_PROTOCOL_H__
+#define __TINC_CONTROL_PROTOCOL_H__
+
+enum request_type {
+	REQ_STOP,
+	REQ_RELOAD,
+	REQ_RESTART,
+};
+
+#define TINC_CTL_VERSION_CURRENT 0
+
+/* This greeting is sent by the server on socket open. */
+typedef struct tinc_ctl_greeting_t {
+	int version;
+} tinc_ctl_greeting_t;
+
+/* A single request or response header. */
+typedef struct tinc_ctl_request_t {
+	size_t length; /* total length, including the header */
+	enum request_type type;
+	int id;
+	int res_errno; /* used only for responses */
+} tinc_ctl_request_t;
+
+#endif