*: explicitly print "exit" at the end of every node config

There is a possibility that the same line can be matched as a command in
some node and its parent node. In this case, when reading the config,
this line is always executed as a command of the child node.

For example, with the following config:
```
router ospf
 network 193.168.0.0/16 area 0
!
mpls ldp
 discovery hello interval 111
!
```
Line `mpls ldp` is processed as command `mpls ldp-sync` inside the
`router ospf` node. This leads to a complete loss of `mpls ldp` node
configuration.

To eliminate this issue and all possible similar issues, let's print an
explicit "exit" at the end of every node config.

This commit also changes indentation for a couple of existing exit
commands so that all existing commands are on the same level as their
corresponding node-entering commands.

Fixes #9206.

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/ospfd/ospf_vty.c b/ospfd/ospf_vty.c
index 4c248c0df..1843947db 100644
--- a/ospfd/ospf_vty.c
+++ b/ospfd/ospf_vty.c
@@ -11970,7 +11970,7 @@ static int config_write_interface_one(struct vty *vty, struct vrf *vrf)
 
 		ospf_opaque_config_write_if(vty, ifp);
 
-		vty_endframe(vty, NULL);
+		vty_endframe(vty, "exit\n!\n");
 	}
 
 	return write;
@@ -12546,6 +12546,8 @@ static int ospf_config_write_one(struct vty *vty, struct ospf *ospf)
 	/* LDP-Sync print */
 	ospf_ldp_sync_write_config(vty, ospf);
 
+	vty_out(vty, "exit\n");
+
 	write++;
 	return write;
 }