Add a second netconfig-commit backend which, if enabled, doesn't
directly send any of the network configuration to the kernel or system
files but delegates the operation to an interested client's D-Bus
method as described in doc/agent-api.txt. This backend is switched to
when a client registers a netconfig agent object and is swiched away
from when the client disconnects or unregisters the agent. Only one
netconfig agent can be registered any given time.
It was found that if the user cancels/disconnects the agent prior to
entering credentials, IWD would get stuck and could no longer accept
any connect calls with the error "Operation already in progress".
For example exiting iwctl in the Password prompt would cause this:
iwctl
$ station wlan0 connect myssid
$ Password: <Ctrl-C>
This was due to the agent never calling the network callback in the
case of an agent disconnect. Network would wait indefinitely for the
credentials, and disallow any future connect attempts.
To fix this agent_finalize_pending can be called in agent_disconnect
with a NULL reply which behaves the same as if there was an
internal timeout and ultimately allows network to fail the connection
Converts agent into an IWD module. This removes the dbus dependency
on agent. Since dbus is initialized very early we can assume
dbus_get_bus is going to return a valid object.
In agent_receive_reply we first call the callback for the pending
request (agent_finalize_pending) then try to send the next request
in the queue. Check that the next request has not been sent already
which could happen if it has been just queued by the callback.
If the request being cancelled by agent_request_cancel has already been
sent over dbus we need to reset pending_id, the timeout, call l_dbus_cancel
to avoid the agent_receive_reply callback (and crash) and perhaps start
the next request. Alternatively we could only reset the callback and not
free the request, then wait until the agent method to return before starting
the next request.
If an application initiates the Connect() operation and
that application has an agent registered, then that
application's agent will be called. Otherwise, the default
agent is called.
Use the org.freedesktop.DBus.Properties interfaces on objects with
properties and drop the old style GetProperty/SetProperty methods on
individual interfaces. Agent and KnownNetworks have no properties at
this time so don't add org.freedesktop.DBus.Properties interfaces.
