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Nicolas Iooss authored Aug 18, 2013 and Dan Williams committed Jan 09, 2014

Enable an OpenVPN tunnel to transmit IPv6 packets by passing relevant configuration variables to NM

Further input is only required if handle_auth() returns a message
from openvpn.  The non-interactive code always assumed that further
authentication was required, and failed the connection.

Always return any secrets which were found even if not strictly
required.  For ExternalUiMode, if the secret doesn't need to be
requested from the user, ensure that ShouldAsk is FALSE for
secrets which are found, but for which the user doesn't need
to enter, such as saved secrets.

This fixes a problem with GNOME Shell when multiple secrets are
stored by the user agent.  Since agents delete any saved secrets before
saving new secrets, this could delete some secrets, but since
that item was not included in the returned secrets, it wouldn't be
re-saved, and would be lost.

Like every other VPN plug-in does.

Make sure gettext knows the translations are in UTF-8, or else they'll
get garbled if the user's domain isn't UTF-8.

https://bugzilla.gnome.org/show_bug.cgi?id=702153

If openvpn server is configured with a non-default key size, clients have to use
the same size too. We add an option to use custom key size in GUI and handle that
in the service and properties code including import/export too.
However, note that using key sizes different from cipher-specific defaults is
not recommended. List available ciphers and default key sizes by
'openvpn --show-ciphers'.

man openvpn: search --keysize

https://bugzilla.gnome.org/show_bug.cgi?id=706775

Use function pointers and populate them with the right functions for
each mode instead of interleaving confusing code everywhere.