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Re: How to get the D-bus path of the settings of a connection ?

On Tue, 2014-04-15 at 11:44 +0200, Manuel Yguel wrote:

Thanks a lot Dan, your explanations were very clear.
Thank to you I got a running example doing creation, connection, 
disconnection and deletion of the settings. I attached the code I wrote. 
It is not completely mature yet since it mixes c++ and C. But I intend 
to put some orthodoxy in it later.
I have an other question, I have seen that the connection called "Test 
of my" is still visible in the list of scanned networks displayed by the 
network-manager-applet. I thought first that it was because the list was 
not updated but it seems not to be the case. Worse: I am able to click 
on it and it looks like it tries to activate it, however I think it does 
not work.
Is this a problem related to the applet or did I miss to remove 
something when managing the adhoc connection ?


Is the stale connection still visible in "nmcli dev wifi list" output?
Is it also still visible in the "iwlist wlan0 scan" output?

Dan



Manuel


On 04/10/2014 05:52 PM, Dan Williams wrote:

On Thu, 2014-04-10 at 14:44 +0200, Manuel Yguel wrote:

I have successfully created and deleted adhoc networks from the glib API
thanks to Dan help. However my test program suffers from one problem:
the network connection configurations get stored in the network manager
memory and pollute the user interface. Thus I try to call
org.freedesktop.NetworkManager.Settings.Connection.Delete for a certain
NMConnection object without any success so far.
I can see in the D-bus (with qdbusviewer) the configuration for a single
network connection and I am able to call the Delete method on it
(because I can see it appears when the setting configuration is recorded).
However I do not know how to get the number (x) in the path that appears at
org/freedesktop/NetworkManager/Settings/x
in order to create a proxy for that "Settings.Connection object" and
call the Delete method on it later.
First I would like to know if there is a way to get the path of the
object storing the org.freedesktop.NetworkManager.Settings.Connection
from the glib API ?

When you add the connection to NetworkManager originally, NM will return
to you the object path that you can use to work with the Connection
object later.  With the libnm-glib API, when you call:

gboolean nm_remote_settings_add_connection (NMRemoteSettings *settings,
                                             NMConnection *connection,
                                             NMRemoteSettingsAddConnectionFunc callback,
                                             gpointer user_data);

"callback" is called when the add is completed, and your callback has
the prototype of:

typedef void (*NMRemoteSettingsAddConnectionFunc) (NMRemoteSettings *settings,
                                                    NMRemoteConnection *connection,
                                                    GError *error,
                                                    gpointer user_data);

The NMRemoteConnection object (a subclass of NMConnection) represents
the actual connection known by NM.  You can throw away the NMConnection
that you handed to nm_remote_settings_add_connection(), it is unchanged
by the call.  The NMRemoteConnection is the "live" object, which you can
keep around and use later with functions like:

void nm_remote_connection_delete (NMRemoteConnection *connection,
                                   NMRemoteConnectionResultFunc callback,
                                   gpointer user_data);


I was first thinking that it may be a NMSettingConnection object. I was
able to access it but I was only able to get the uuid or the human name
of the connection.
I also tried the nm_connection_get_path on the NMConnection object but I
get a NULL string.
I am quite stuck now and any help would be much appreciated.

I think the issue is that you might still be using the NMConnection that
you built up to send to NM with the add_connection() call.  That object
isn't consumed by add_connection(), but serves as a template and can be
disposed after calling add_connection().  The NMRemoteConnection is what
you want to use.

I've committed some more documentation to libnm-glib's NMRemoteSettings
object which describes this and hopefully helps you out.

http://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=2200687b0f92d553dc79e54b672069b2b704203d

There are also some examples here, the ones you're interested in have
"libnm-glib" in the name:

http://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/examples/C/glib

Let us know if you have further questions!

Dan



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