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# Copyright (C) 2009 One Laptop per Child
#
# 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 St, Fifth Floor, Boston, MA 02110-1301 USA
import logging
import dbus
import gobject
from jarabe.model import network
from jarabe.model.network import Settings
from jarabe.model.network import OlpcMesh as OlpcMeshSettings
from sugar.util import unique_id
_NM_SERVICE = 'org.freedesktop.NetworkManager'
_NM_IFACE = 'org.freedesktop.NetworkManager'
_NM_PATH = '/org/freedesktop/NetworkManager'
_NM_DEVICE_IFACE = 'org.freedesktop.NetworkManager.Device'
_NM_OLPC_MESH_IFACE = 'org.freedesktop.NetworkManager.Device.OlpcMesh'
_XS_ANYCAST = "\xc0\x27\xc0\x27\xc0\x00"
DEVICE_STATE_UNKNOWN = 0
DEVICE_STATE_UNMANAGED = 1
DEVICE_STATE_UNAVAILABLE = 2
DEVICE_STATE_DISCONNECTED = 3
DEVICE_STATE_PREPARE = 4
DEVICE_STATE_CONFIG = 5
DEVICE_STATE_NEED_AUTH = 6
DEVICE_STATE_IP_CONFIG = 7
DEVICE_STATE_ACTIVATED = 8
DEVICE_STATE_FAILED = 9
class OlpcMeshManager(object):
def __init__(self, mesh_device):
self._bus = dbus.SystemBus()
self.mesh_device = mesh_device
self.eth_device = self._get_companion_device()
self._connection_queue = []
"""Stack of connections that we'll iterate through until we find one
that works.
"""
props = dbus.Interface(self.mesh_device,
'org.freedesktop.DBus.Properties')
props.Get(_NM_DEVICE_IFACE, 'State',
reply_handler=self.__get_mesh_state_reply_cb,
error_handler=self.__get_state_error_cb)
props = dbus.Interface(self.eth_device,
'org.freedesktop.DBus.Properties')
props.Get(_NM_DEVICE_IFACE, 'State',
reply_handler=self.__get_eth_state_reply_cb,
error_handler=self.__get_state_error_cb)
self._bus.add_signal_receiver(self.__eth_device_state_changed_cb,
signal_name='StateChanged',
path=self.eth_device.object_path,
dbus_interface=_NM_DEVICE_IFACE)
self._bus.add_signal_receiver(self.__mshdev_state_changed_cb,
signal_name='StateChanged',
path=self.mesh_device.object_path,
dbus_interface=_NM_DEVICE_IFACE)
self._idle_source = 0
self._mesh_device_state = DEVICE_STATE_UNKNOWN
self._eth_device_state = DEVICE_STATE_UNKNOWN
if self._have_configured_connections():
self._start_automesh()
else:
self._start_automesh_timer()
def _get_companion_device(self):
props = dbus.Interface(self.mesh_device,
'org.freedesktop.DBus.Properties')
eth_device_o = props.Get(_NM_OLPC_MESH_IFACE, 'Companion')
return self._bus.get_object(_NM_SERVICE, eth_device_o)
def _have_configured_connections(self):
return len(network.get_settings().connections) > 0
def _start_automesh_timer(self):
"""Start our timer system which basically looks for 10 seconds of
inactivity on both devices, then starts automesh.
"""
if self._idle_source != 0:
gobject.source_remove(self._idle_source)
self._idle_source = gobject.timeout_add_seconds(10, self._idle_check)
def __get_state_error_cb(self, err):
logging.debug('Error getting the device state: %s', err)
def __get_mesh_state_reply_cb(self, state):
self._mesh_device_state = state
self._maybe_schedule_idle_check()
def __get_eth_state_reply_cb(self, state):
self._eth_device_state = state
self._maybe_schedule_idle_check()
def __eth_device_state_changed_cb(self, new_state, old_state, reason):
"""If a connection is activated on the eth device, stop trying our
automatic connections.
"""
self._eth_device_state = new_state
self._maybe_schedule_idle_check()
if new_state >= DEVICE_STATE_PREPARE \
and new_state <= DEVICE_STATE_ACTIVATED \
and len(self._connection_queue) > 0:
self._connection_queue = []
def __mshdev_state_changed_cb(self, new_state, old_state, reason):
self._mesh_device_state = new_state
self._maybe_schedule_idle_check()
if new_state == DEVICE_STATE_FAILED:
self._try_next_connection_from_queue()
elif new_state == DEVICE_STATE_ACTIVATED \
and len(self._connection_queue) > 0:
self._empty_connection_queue()
def _maybe_schedule_idle_check(self):
if self._mesh_device_state == DEVICE_STATE_DISCONNECTED \
and self._eth_device_state == DEVICE_STATE_DISCONNECTED:
self._start_automesh_timer()
def _idle_check(self):
if self._mesh_device_state == DEVICE_STATE_DISCONNECTED \
and self._eth_device_state == DEVICE_STATE_DISCONNECTED:
logging.debug("starting automesh due to inactivity")
self._start_automesh()
return False
def _make_connection(self, channel, anycast_address=None):
wireless_config = OlpcMeshSettings(channel, anycast_address)
settings = Settings(wireless_cfg=wireless_config)
if not anycast_address:
settings.ip4_config = network.IP4Config()
settings.ip4_config.method = 'link-local'
settings.connection.id = 'olpc-mesh-' + str(channel)
settings.connection.uuid = unique_id()
settings.connection.type = '802-11-olpc-mesh'
connection = network.add_connection(settings.connection.id, settings)
return connection
def __activate_reply_cb(self, connection):
logging.debug('Connection activated: %s', connection)
def __activate_error_cb(self, err):
logging.error('Failed to activate connection: %s', err)
def _activate_connection(self, channel, anycast_address=None):
logging.debug("activate channel %d anycast %s",
(channel, repr(anycast_address)))
proxy = self._bus.get_object(_NM_SERVICE, _NM_PATH)
network_manager = dbus.Interface(proxy, _NM_IFACE)
connection = self._make_connection(channel, anycast_address)
network_manager.ActivateConnection(network.SETTINGS_SERVICE,
connection.path,
self.mesh_device.object_path,
self.mesh_device.object_path,
reply_handler=self.__activate_reply_cb,
error_handler=self.__activate_error_cb)
def _try_next_connection_from_queue(self):
if len(self._connection_queue) == 0:
return
channel, anycast = self._connection_queue.pop()
self._activate_connection(channel, anycast)
def _empty_connection_queue(self):
self._connection_queue = []
def user_activate_channel(self, channel):
"""Activate a mesh connection on a user-specified channel.
Looks for XS first, then resorts to simple mesh."""
self._empty_connection_queue()
self._connection_queue.append((channel, None))
self._connection_queue.append((channel, _XS_ANYCAST))
self._try_next_connection_from_queue()
def _start_automesh(self):
"""Start meshing automatically, intended when there are no better
networks to connect to. First looks for XS on all channels, then falls
back to simple mesh on channel 1."""
self._empty_connection_queue()
self._connection_queue.append((1, None))
self._connection_queue.append((11, _XS_ANYCAST))
self._connection_queue.append((6, _XS_ANYCAST))
self._connection_queue.append((1, _XS_ANYCAST))
self._try_next_connection_from_queue()
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