Since a link-local address should pretty much always be
assigned to an active interface, avoid flushing the routes
that allow link-local communication to work.
Use the interfaces kernel index when we can to avoid unecessary
iface->index lookups; and let callers figure out which address
family they really want to flush.
Previously the input would simply be printed, but if you're not
changing either the level or domains (ie sending "") then the
unchanged logging domains wouldn't be printed, only "".
As long as at least one IP config method completes, and as long as
methods that the user required to complete do complete, allow the
connection to complete.
When this property is TRUE, IP configuration can continue as long
as at least on IP configuration type succeeds. This allows
connections to networks where the user does not necessarily know
whether the network supports IPv4 or IPv6 and does not require
that both complete succesfully.
Since most of the time the user doesn't really care what type
of connectivity they have, as long as they have *some* connectivity,
this allows better "Just Works" behavior as long as the system
settings plugins and connection editors/applets use the right
defaults.
Suggested defaults for may-fail are:
IPv4: no (ie, require IPv4 connectivity)
IPv6: yes (ie, do not require IPv6 connectivity)
Users who require a specific type of connectivity are probably
knowlegable enough to check the box as needed for their network.
When the client exits it may take a short amount of time for the
dhclient hook script to deliver the options to NetworkManager; so
we need to keep the client object around a bit (so we know what
NMDHCPClient the options getting delivered are for). If we don't,
the DHCPManager will dispose of the DHCPClient object and then
when the options come in, it can't match up the PID from the
options with the PID of an existing NMDHCPClient. So put the
clients on a removal timer that keeps them around for a bit before
we let the manager dispose of them.
Since we're keeping the PID around too instead of zeroing it when
the client exits (for the reason above), track whether the client
is really dead yet so we don't indiscriminately kill a random
process that happens to re-use the PID.
Ignore early exits of the client in info-only mode; since there is
no address lease the client doesn't need to stick around after
getting DNS/etc options from the server.
Clients in IPv6 info-only mode may exit after getting a response
from the server, since there are no leases involved in info-only
mode. To ensure that the client's options are received when the
event comes in (which could be after we get the child watch
callback for the exit) we still need the client's PID.
