Trigger a USR1 if dco_update_keys fails

Trigger a USR1 if dco_update_keys fails

When dco_update_keys fails, we are in some weird state that we are
unlikely to recover since what userspace and kernel space think of
the keys is very likely to not in sync anymore. So abandon the
connection if this happens.

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Antonio Quartulli <antonio@openvpn.net>
Message-Id: <20221213225430.1892940-2-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg25679.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 419051c96e9fb1f3202fd67733aa3b6a4bbc3181)