Re: Creating adhoc wireless Network

[Dan Williams <dcbw redhat com>]

On Mon, 2009-07-06 at 11:18 -0400, nexus aflb com wrote:
> Hi Dan,
> 
> I'm playing with the script you provide me but I have a problem :
> 
> File "Create_Wireless.py", line 135, in <module>
>     if props['DeviceType'] == 2:   # wifi
> KeyError: 'DeviceType'
> 
> if I execute step by steps :
> 
> >>> print nm_iface.GetDevices()
> dbus.Array([dbus.ObjectPath('/org/freedesktop/Hal/devices/net_00_24_81_56_2e_52'),
> dbus.ObjectPath('/org/freedesktop/Hal/devices/net_00_22_fa_46_76_9a')],
> signature=dbus.Signature('o'))
> >>> dev_proxy =
> sys_bus.get_object('org.freedesktop.NetworkManager','/org/freedesktop/Hal/devices/net_00_22_fa_46_76_9a')
> >>> print dev_proxy
> <ProxyObject wrapping <dbus._dbus.SystemBus (system) at 0xb7a5811c> :1.7
> /org/freedesktop/Hal/devices/net_00_22_fa_46_76_9a at 0xb7a5a80c>
> >>> dev_props_iface = dbus.Interface(dev_proxy,
> 'org.freedesktop.DBus.Properties')
> >>> print dev_props_iface
> <Interface <ProxyObject wrapping <dbus._dbus.SystemBus (system) at
> 0xb7a5811c> :1.7 /org/freedesktop/Hal/devices/net_00_22_fa_46_76_9a at
> 0xb7a5a80c> implementing 'org.freedesktop.DBus.Properties' at 0xb7a5a9ac>
> >>> print dev_props_iface.GetAll('org.freedesktop.NetworkManager.Device')
> dbus.Dictionary({}, signature=dbus.Signature('sv'))
> 
> It seems empty ! What's wrong ?

What version of dbus-glib do you have?  What does 'nm-tool' print out
when you run it?

Dan

> Thanks
> 
> 
> > On Wed, 2009-07-01 at 12:28 -0400, Dan Williams wrote:
> >> On Wed, 2009-07-01 at 11:26 -0400, nexus aflb com wrote:
> >> > Thanks for this quick answer.
> >> >
> >> > That's what I though. Adding a new connection isnot easy to do...
> >> >
> >> > when you say "programmatically ask the system settings service to
> >> create it"
> >> >
> >> > What do you mean ? Doing the same stuff as nm-applet but hardcoded ?
> >>
> >> Same way nm-connection-editor asks the system settings service to create
> >> a new connection when the user hits "Apply": you call the
> >> AddConnection() method on the
> >> org.freedesktop.NetworkManagerSettings.System interface with the
> >> connection details you want to set.
> >>
> >> Unfortunately we didn't define that method to return the object path of
> >> the newly created connection in 0.7 (will probably be fixed in 0.8), so
> >> you have to wait for the NewConnection signal that the
> >> system-settings-service emits, look for the UUID of the connection you
> >> just created to get the object path, and then tell NM to activate that
> >> connection.
> >>
> >> It's pretty straightforward actually, once you know what needs to be
> >> done.  If PolicyKit throws up a dialog, use polkit-gnome-authorization
> >> to allow the user to always have the
> >> org.freedesktop.network-manager-settings.system.modify permission and
> >> the user won't ever get asked.
> >
> > Check out the attached script.  It will create a WEP-enabled adhoc
> > connection if that connection (identified by UUID) doesn't already
> > exist, and then direct NetworkManager to activate that connection.  The
> > script is somewhat longer than it needs to be, simply because I made it
> > more readable, added comments so you can figure out what's going on, and
> > put some reasonable error checking in.
> >
> > Dan
> > ----
> >
> > #!/bin/env python
> > # -*- Mode: Python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4
> > -*-
> > #
> > # Copyright (C) 2009 Red Hat, Inc.
> > #
> > # This program is free software; you can redistribute it and/or modify
> > # it under the terms of the GNU General Public License as published by
> > # the Free Software Foundation; either version 2 of the License, or
> > # (at your option) any later version.
> > #
> > # This program is distributed in the hope that it will be useful,
> > # but WITHOUT ANY WARRANTY; without even the implied warranty of
> > # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > # GNU General Public License for more details.
> > #
> > # You should have received a copy of the GNU General Public License along
> > # with this program; if not, write to the Free Software Foundation, Inc.,
> > # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> > #
> >
> > import dbus
> > import glib
> > import sys
> > import posix
> > import time
> >
> > uuid = "cabfaf9e-4043-4afb-8506-0e6f4a225636"
> >
> > s_con = { 'id':          'My AdHoc',
> >           'uuid':        uuid,
> >           'type':        '802-11-wireless',
> >           'autoconnect': False,
> >           'name':        'connection' }
> >
> > s_wifi = { 'ssid':     dbus.ByteArray("foobar"),
> >            'mode':     'adhoc',
> >            'security': '802-11-wireless-security',
> >            'name':     '802-11-wireless' }
> >
> > s_wsec = { 'key-mgmt': 'none',
> >            'wep-key0': '0123456789abcdef0123456789',
> >            'name':     '802-11-wireless-security' }
> >
> > s_ip4 = { 'method': 'link-local',
> >           'name':   'ipv4' }
> >
> > con = { 'connection': s_con,
> >         '802-11-wireless': s_wifi,
> >         '802-11-wireless-security': s_wsec,
> >         'ipv4': s_ip4 }
> >
> > # init dbus
> > sys_bus = dbus.SystemBus()
> > ses_bus = dbus.SessionBus()
> >
> > ss_proxy =
> > sys_bus.get_object('org.freedesktop.NetworkManagerSystemSettings',
> >                           '/org/freedesktop/NetworkManagerSettings')
> > ss_iface = dbus.Interface(ss_proxy,
> > 'org.freedesktop.NetworkManagerSettings')
> > ss_sys_iface = dbus.Interface(ss_proxy,
> > 'org.freedesktop.NetworkManagerSettings.System')
> >
> > nm_proxy = sys_bus.get_object('org.freedesktop.NetworkManager',
> >                               '/org/freedesktop/NetworkManager')
> > nm_iface = dbus.Interface(nm_proxy, 'org.freedesktop.NetworkManager')
> >
> > pk_proxy =
> > ses_bus.get_object('org.freedesktop.PolicyKit.AuthenticationAgent', '/')
> > pk_iface = dbus.Interface(pk_proxy,
> > 'org.freedesktop.PolicyKit.AuthenticationAgent')
> >
> > def find_connection(requested_uuid):
> >     for c in ss_iface.ListConnections():
> >         # get the details of the connection
> >         c_proxy =
> > sys_bus.get_object('org.freedesktop.NetworkManagerSystemSettings',
> > c)
> >         c_iface = dbus.Interface(c_proxy,
> > 'org.freedesktop.NetworkManagerSettings.Connection')
> >         settings = c_iface.GetSettings()
> >         if settings['connection']['uuid'] == requested_uuid:
> >             # found our connection
> >             return c
> >     return None
> >
> > def try_add(connection):
> >     try:
> >         # Ask the system settings service to create the connection
> >         ss_sys_iface.AddConnection(connection)
> >         return None
> >     except Exception, e:
> >         parts = str(e).split(' ')
> >         if
> > parts[0].find('org.freedesktop.NetworkManagerSettings.System.NotPrivileged')
> > < 0:
> >             # not a permission denied, give up and exit
> >             print e
> >             sys.exit(1)
> >         # yay, permission denied, we can handle this
> >         return parts[1]
> >
> > # MAIN PROGRAM
> >
> > con_path = find_connection(uuid)
> > if not con_path:
> >     # Try to create the connection, which could fail if we need
> > authorization.
> >     # If auth is required, get the auth and try adding it again
> >     action = try_add(con)
> >     if action:
> >         gained = pk_iface.ObtainAuthorization(action, 0, posix.getpid())
> >         if gained:
> >             # Yay, we have the privilege now, try adding again
> >             action = try_add(con)
> >             if action:
> >                 # hmm, something went wrong and PolicyKit wasn't able to
> > auth the user
> >                 sys.exit(1)
> >
> >             con_path = find_connection(uuid)
> >
> > # Check again in case it was just added
> > if not con_path:
> >     print "Couldn't get newly created connection from system settings"
> >
> > # Find a wifi device to activate this connection on
> > dev_path = None
> > for dev in nm_iface.GetDevices():
> >     dev_proxy = sys_bus.get_object('org.freedesktop.NetworkManager', dev)
> >     dev_props_iface = dbus.Interface(dev_proxy,
> > 'org.freedesktop.DBus.Properties')
> >     props =
> > dev_props_iface.GetAll('org.freedesktop.NetworkManager.Device')
> >     if props['DeviceType'] == 2:   # wifi
> >         dev_path = dev
> >         break
> >
> > if not dev_path:
> >     print "No wifi devices available"
> >     sys.exit(1)
> >
> > # Now ask NM to activate that connection
> > active_path =
> > nm_iface.ActivateConnection('org.freedesktop.NetworkManagerSystemSettings',
> >                                           con_path, dev_path, "/")
> > if not active_path:
> >     print "Couldn't activate connection"
> >     sys.exit(1)
> >
> > # Wait for the connection to become active
> > active_proxy = sys_bus.get_object('org.freedesktop.NetworkManager',
> > active_path)
> > active_props_iface = dbus.Interface(active_proxy,
> > 'org.freedesktop.DBus.Properties')
> >
> > state = 0
> > while state != 2:  # 2 == activated
> >     state =
> > active_props_iface.Get('org.freedesktop.NetworkManager.Connection.Active',
> > 'State')
> >     if state != 2:
> >         print "waiting for connection to become active..."
> >         time.sleep(1)
> >
> > print "activated!"
> >
> >
> >
> 
>