From: Antonio Quartulli <anto...@mandelbit.com>

We may bail out parsing an incoming DCO message because it may
concern a different interface.
In that case we print the following debug messages:

    dco_do_read
    ovpn-dco: ignoring message (type=5) for foreign ifindex 313
    process_incoming_dco: received message of type 0 - ignoring

However, the last message is confusing, because there is no message
of type 0 being received, but the message_type was simply not
initialized.

Bail out parsing earlier and avoid printing any bogus text.

Change-Id: I568faa12a5960e8b69de23c2df413b70b231592c
Signed-off-by: Antonio Quartulli <anto...@mandelbit.com>
Acked-by: Gert Doering <g...@greenie.muc.de>
---

This change was reviewed on Gerrit and approved by at least one
developer. I request to merge it to master.

Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1027
This mail reflects revision 3 of this Change.

Acked-by according to Gerrit (reflected above):
Gert Doering <g...@greenie.muc.de>

        
diff --git a/src/openvpn/forward.c b/src/openvpn/forward.c
index ed4cdb4..7134f30 100644
--- a/src/openvpn/forward.c
+++ b/src/openvpn/forward.c
@@ -1251,6 +1251,12 @@
 
     dco_do_read(dco);
 
+    /* no message for us to handle - platform specific code has logged details 
*/
+    if (dco->dco_message_type == 0)
+    {
+        return;
+    }
+
     /* FreeBSD currently sends us removal notifcation with the old peer-id in
      * p2p mode with the ping timeout reason, so ignore that one to not shoot
      * ourselves in the foot and removing the just established session */


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