lib: add simplified native msg support

This is intended to replace protobuf use in mgmtd.

Signed-off-by: Christian Hopps <chopps@labn.net>

1 files changed, 45 insertions, 0 deletions

diff --git a/lib/mgmt_msg_native.c b/lib/mgmt_msg_native.c
new file mode 100644
index 0000000000..a9e8a1711d
--- /dev/null
+++ b/lib/mgmt_msg_native.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * June 29 2023, Christian Hopps <chopps@labn.net>
+ *
+ * Copyright (c) 2023, LabN Consulting, L.L.C.
+ *
+ */
+#include <zebra.h>
+#include "mgmt_msg_native.h"
+
+DEFINE_MGROUP(MSG_NATIVE, "Native message allocations");
+DEFINE_MTYPE(MSG_NATIVE, MSG_NATIVE_MSG, "native mgmt msg");
+DEFINE_MTYPE(MSG_NATIVE, MSG_NATIVE_ERROR, "native mgmt error msg");
+
+int vmgmt_msg_native_send_error(struct msg_conn *conn, uint64_t sess_or_txn_id,
+				uint64_t req_id, bool short_circuit_ok,
+				int16_t error, const char *errfmt, va_list ap)
+{
+	struct mgmt_msg_error *msg;
+	ssize_t slen;
+	size_t mlen;
+	int ret;
+
+	msg = XCALLOC(MTYPE_MSG_NATIVE_ERROR, 1024);
+	msg->session_id = sess_or_txn_id;
+	msg->req_id = req_id;
+	msg->code = MGMT_MSG_CODE_ERROR;
+	msg->error = error;
+
+	slen = vsnprintfrr(msg->errstr, 1024 - sizeof(*msg), errfmt, ap);
+	mlen = MIN(slen + sizeof(*msg) + 1, 1024);
+
+	if (conn->debug)
+		zlog_debug("Sending error %d session-id %" PRIu64
+			   " req-id %" PRIu64 " scok %d errstr: %s",
+			   error, sess_or_txn_id, req_id, short_circuit_ok,
+			   msg->errstr);
+
+	ret = msg_conn_send_msg(conn, MGMT_MSG_VERSION_NATIVE, msg, mlen, NULL,
+				short_circuit_ok);
+
+	XFREE(MTYPE_MSG_NATIVE_ERROR, msg);
+
+	return ret;
+}