#!/usr/bin/env python """ monitor -- connection monitoring process This process is spawned as a child of the daemon, and is responsible for monitoring connection status and initiating autoreconnection when appropriate. """ # # Copyright (C) 2007 - 2009 Adam Blackburn # Copyright (C) 2007 - 2009 Dan O'Reilly # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License Version 2 as # published by the Free Software Foundation. # # 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, see . # import gobject import time from dbus import DBusException from wicd import wpath from wicd import misc from wicd import dbusmanager misc.RenameProcess("wicd-monitor") if __name__ == '__main__': wpath.chdir(__file__) dbusmanager.connect_to_dbus() dbus_dict = dbusmanager.get_dbus_ifaces() daemon = dbus_dict["daemon"] wired = dbus_dict["wired"] wireless = dbus_dict["wireless"] mainloop = None def diewithdbus(func): def wrapper(self, *__args, **__kargs): try: ret = func(self, *__args, **__kargs) self.__lost_dbus_count = 0 return ret except DBusException, e: print "Caught exception %s" % str(e) if not hasattr(self, "__lost_dbus_count"): self.__lost_dbus_count = 0 if self.__lost_dbus_count > 3: mainloop.quit() self.__lost_dbus_count += 1 return True wrapper.__name__ = func.__name__ wrapper.__dict__ = func.__dict__ wrapper.__doc__ = func.__doc__ return wrapper class ConnectionStatus(object): """ Class for monitoring the computer's connection status. """ def __init__(self): """ Initialize variables needed for the connection status methods. """ self.last_strength = -2 self.last_state = misc.NOT_CONNECTED self.last_reconnect_time = time.time() self.last_network = "" self.displayed_strength = -1 self.still_wired = False self.network = '' self.tried_reconnect = False self.connection_lost_counter = 0 self.reconnecting = False self.reconnect_tries = 0 self.signal_changed = False self.iwconfig = "" self.trigger_reconnect = False self.__lost_dbus_count = 0 self._to_time = daemon.GetBackendUpdateInterval() self.add_poll_callback() bus = dbusmanager.get_bus() bus.add_signal_receiver(self._force_update_connection_status, "UpdateState", "org.wicd.daemon") bus.add_signal_receiver(self._update_timeout_interval, "SignalBackendChanged", "org.wicd.daemon") def _update_timeout_interval(self, interval): """ Update the callback interval when signaled by the daemon. """ self._to_time = interval gobject.source_remove(self.update_callback) self.add_poll_callback() def _force_update_connection_status(self): """ Run a connection status update on demand. Removes the scheduled update_connection_status() call, explicitly calls the function, and reschedules it. """ gobject.source_remove(self.update_callback) self.update_connection_status() self.add_poll_callback() def add_poll_callback(self): """ Registers a polling call at a predetermined interval. The polling interval is determined by the backend in use. """ self.update_callback = misc.timeout_add(self._to_time, self.update_connection_status) def check_for_wired_connection(self, wired_ip): """ Checks for a wired connection. Checks for two states: 1) A wired connection is not in use, but a cable is plugged in, and the user has chosen to switch to a wired connection whenever its available, even if already connected to a wireless network. 2) A wired connection is currently active. """ self.trigger_reconnect = False if not wired_ip and daemon.GetPreferWiredNetwork(): if not daemon.GetForcedDisconnect() and wired.CheckPluggedIn(): self.trigger_reconnect = True elif wired_ip and wired.CheckPluggedIn(): # Only change the interface if it's not already set for wired if not self.still_wired: daemon.SetCurrentInterface(daemon.GetWiredInterface()) self.still_wired = True return True # Wired connection isn't active elif wired_ip and self.still_wired: # If we still have an IP, but no cable is plugged in # we should disconnect to clear it. wired.DisconnectWired() self.still_wired = False return False def check_for_wireless_connection(self, wireless_ip): """ Checks for an active wireless connection. Checks for an active wireless connection. Also notes if the signal strength is 0, and if it remains there for too long, triggers a wireless disconnect. Returns True if wireless connection is active, and False otherwise. """ # Make sure we have an IP before we do anything else. if not wireless_ip: return False if daemon.NeedsExternalCalls(): self.iwconfig = wireless.GetIwconfig() else: self.iwconfig = '' # Reset this, just in case. self.tried_reconnect = False bssid = wireless.GetApBssid() if not bssid: return False wifi_signal = self._get_printable_sig_strength(always_positive=True) if wifi_signal <= 0: # If we have no signal, increment connection loss counter. # If we haven't gotten any signal 4 runs in a row (12 seconds), # try to reconnect. self.connection_lost_counter += 1 print self.connection_lost_counter if self.connection_lost_counter >= 4 and daemon.GetAutoReconnect(): wireless.DisconnectWireless() self.connection_lost_counter = 0 return False else: # If we have a signal, reset the counter self.connection_lost_counter = 0 if (wifi_signal != self.last_strength or self.network != self.last_network): self.last_strength = wifi_signal self.last_network = self.network self.signal_changed = True daemon.SetCurrentInterface(daemon.GetWirelessInterface()) return True @diewithdbus def update_connection_status(self): """ Updates the tray icon and current connection status. Determines the current connection state and sends a dbus signal announcing when the status changes. Also starts the automatic reconnection process if necessary. """ wired_ip = None wifi_ip = None if daemon.GetSuspend(): print "Suspended." state = misc.SUSPENDED return self.update_state(state) # Determine what our current state is. # Are we currently connecting? if daemon.CheckIfConnecting(): state = misc.CONNECTING return self.update_state(state) daemon.SendConnectResultsIfAvail() # Check for wired. wired_ip = wired.GetWiredIP("") wired_found = self.check_for_wired_connection(wired_ip) if wired_found: return self.update_state(misc.WIRED, wired_ip=wired_ip) # Check for wireless wifi_ip = wireless.GetWirelessIP("") self.signal_changed = False wireless_found = self.check_for_wireless_connection(wifi_ip) if wireless_found: if self.trigger_reconnect: # If we made it here, that means we want to switch # to a wired network whenever possible, but a wireless # connection is active. So we kill the wireless connection # so the autoconnect logic will connect to the wired network. self.trigger_reconnect = False # Don't trigger it if the gui is open, because autoconnect # is disabled while it's open. if not daemon.GetGUIOpen(): print 'Killing wireless connection to switch to wired...' wireless.DisconnectWireless() daemon.AutoConnect(False, reply_handler=lambda *a:None, error_handler=lambda *a:None) return self.update_state(misc.NOT_CONNECTED) return self.update_state(misc.WIRELESS, wifi_ip=wifi_ip) state = misc.NOT_CONNECTED if self.last_state == misc.WIRELESS: from_wireless = True else: from_wireless = False self.auto_reconnect(from_wireless) return self.update_state(state) def update_state(self, state, wired_ip=None, wifi_ip=None): """ Set the current connection state. """ # Set our connection state/info. iwconfig = self.iwconfig if state == misc.NOT_CONNECTED: info = [""] elif state == misc.SUSPENDED: info = [""] elif state == misc.CONNECTING: if wired.CheckIfWiredConnecting(): info = ["wired"] else: info = ["wireless", str(wireless.GetCurrentNetwork(iwconfig))] elif state == misc.WIRELESS: self.reconnect_tries = 0 info = [str(wifi_ip), str(wireless.GetCurrentNetwork(iwconfig)), str(self._get_printable_sig_strength()), str(wireless.GetCurrentNetworkID(iwconfig)), wireless.GetCurrentBitrate(iwconfig)] elif state == misc.WIRED: self.reconnect_tries = 0 info = [str(wired_ip)] else: print 'ERROR: Invalid state!' return True daemon.SetConnectionStatus(state, info) # Send a D-Bus signal announcing status has changed if necessary. if (state != self.last_state or (state == misc.WIRELESS and self.signal_changed)): daemon.EmitStatusChanged(state, info) if (state != self.last_state) and (state == misc.NOT_CONNECTED) and \ (not daemon.GetForcedDisconnect()): daemon.Disconnect() # Disconnect() sets forced disconnect = True # so we'll revert that daemon.SetForcedDisconnect(False) self.last_state = state return True def _get_printable_sig_strength(self, always_positive=False): """ Get the correct signal strength format. """ try: if daemon.GetSignalDisplayType() == 0: wifi_signal = int(wireless.GetCurrentSignalStrength(self.iwconfig)) else: if always_positive: # because dBm is negative, add 99 to the signal. This way, if # the signal drops below -99, wifi_signal will == 0, and # an automatic reconnect will be triggered # this is only used in check_for_wireless_connection wifi_signal = 99 + int(wireless.GetCurrentDBMStrength(self.iwconfig)) else: wifi_signal = int(wireless.GetCurrentDBMStrength(self.iwconfig)) except TypeError: wifi_signal = 0 return wifi_signal def auto_reconnect(self, from_wireless=None): """ Automatically reconnects to a network if needed. If automatic reconnection is turned on, this method will attempt to first reconnect to the last used wireless network, and should that fail will simply run AutoConnect() """ if self.reconnecting: return # Some checks to keep reconnect retries from going crazy. if (self.reconnect_tries > 3 and (time.time() - self.last_reconnect_time) < 200): print "Throttling autoreconnect" return self.reconnecting = True daemon.SetCurrentInterface('') if daemon.ShouldAutoReconnect(): print 'Starting automatic reconnect process' self.last_reconnect_time = time.time() self.reconnect_tries += 1 # If we just lost a wireless connection, try to connect to that # network again. Otherwise just call Autoconnect. cur_net_id = wireless.GetCurrentNetworkID(self.iwconfig) if from_wireless and cur_net_id > -1: # make sure disconnect scripts are run # before we reconnect print 'Disconnecting from network' wireless.DisconnectWireless() print 'Trying to reconnect to last used wireless ' + \ 'network' wireless.ConnectWireless(cur_net_id) else: daemon.AutoConnect(True, reply_handler=reply_handle, error_handler=err_handle) self.reconnecting = False def reply_handle(): """ Just a dummy function needed for asynchronous dbus calls. """ pass def err_handle(error): """ Just a dummy function needed for asynchronous dbus calls. """ pass def main(): """ Starts the connection monitor. Starts a ConnectionStatus instance, sets the status to update an amount of time determined by the active backend. """ global mainloop monitor = ConnectionStatus() mainloop = gobject.MainLoop() mainloop.run() if __name__ == '__main__': main()