#!/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 Adam Blackburn # Copyright (C) 2007 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 dbus import gobject import sys import time from dbus.mainloop.glib import DBusGMainLoop import wpath import misc misc.RenameProcess("wicd-monitor") if __name__ == '__main__': wpath.chdir(__file__) DBusGMainLoop(set_as_default=True) proxy_obj = dbus.SystemBus().get_object('org.wicd.daemon', '/org/wicd/daemon') daemon = dbus.Interface(proxy_obj, 'org.wicd.daemon') wired = dbus.Interface(proxy_obj, 'org.wicd.daemon.wired') wireless = dbus.Interface(proxy_obj, 'org.wicd.daemon.wireless') class ConnectionStatus(): """ Class for monitoring the computer's connection status. """ def __init__(self): """ Initialize variables needed for the connection status methods. """ self.last_strength = -2 self.displayed_strength = -1 self.still_wired = False self.network = '' self.tried_reconnect = False self.connection_lost_counter = 0 self.last_state = misc.NOT_CONNECTED self.reconnecting = False self.reconnect_tries = 0 self.last_reconnect_time = time.time() self.signal_changed = False # This determines if we use ioctl or external programs self.fast = True self.iwconfig = '' def check_for_wired_connection(self, wired_ip): """ Checks for an active wired connection. Checks for and updates the tray icon for an active wired connection Returns True if wired connection is active, false if inactive. """ if wired_ip and wired.CheckPluggedIn(self.fast): # 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 self.still_wired = False return False def check_for_wireless_connection(self, wireless_ip): """ Checks for an active wireless connection. Checks for and updates the tray icon for an active wireless connection. Returns True if wireless connection is active, and False otherwise. """ # Make sure we have an IP before we do anything else. if wireless_ip is None: return False if self.fast: self.iwconfig = '' else: self.iwconfig = wireless.GetIwconfig() # Reset this, just in case. self.tried_reconnect = False # Try getting signal strength, and default to 0 # if something goes wrong. try: if daemon.GetSignalDisplayType() == 0: wifi_signal = int(wireless.GetCurrentSignalStrength(self.iwconfig, self.fast)) else: wifi_signal = int(wireless.GetCurrentDBMStrength(self.iwconfig, self.fast)) except: wifi_signal = 0 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: self.connection_lost_counter = 0 return False else: # If we have a signal, reset the counter self.connection_lost_counter = 0 # Only update if the signal strength has changed because doing I/O # calls is expensive, and the icon flickers. if (wifi_signal != self.last_strength or self.network != wireless.GetCurrentNetwork(self.iwconfig, self.fast)): self.last_strength = wifi_signal self.signal_changed = True daemon.SetCurrentInterface(daemon.GetWirelessInterface()) return True 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 try: if daemon.GetSuspend(): print "Suspended." state = misc.SUSPENDED self.update_state(state) return True # Determine what our current state is. # Check for wired. wired_ip = wired.GetWiredIP(self.fast) wired_found = self.check_for_wired_connection(wired_ip) if wired_found: self.update_state(misc.WIRED, wired_ip=wired_ip) return True # Check for wireless wifi_ip = wireless.GetWirelessIP(self.fast) #self.iwconfig = wireless.GetIwconfig() self.signal_changed = False wireless_found = self.check_for_wireless_connection(wifi_ip) if wireless_found: self.update_state(misc.WIRELESS, wifi_ip=wifi_ip) return True # Are we currently connecting? if daemon.CheckIfConnecting(): state = misc.CONNECTING else: # No connection at all. state = misc.NOT_CONNECTED if self.last_state == misc.WIRELESS: from_wireless = True else: from_wireless = False self.auto_reconnect(from_wireless) self.update_state(state) except dbus.exceptions.DBusException, e: print 'Ignoring DBus Error: ' + str(e) finally: return True def update_state(self, state, wired_ip=None, wifi_ip=None): """ Set the current connection state. """ # Set our connection state/info. iwconfig = self.iwconfig fast = self.fast if state == misc.NOT_CONNECTED: info = [""] elif state == misc.SUSPENDED: info = [""] elif state == misc.CONNECTING: if wired.CheckIfWiredConnecting(): info = ["wired"] else: info = ["wireless", wireless.GetCurrentNetwork(iwconfig, fast)] elif state == misc.WIRELESS: self.reconnect_tries = 0 info = [wifi_ip, wireless.GetCurrentNetwork(iwconfig, fast), str(wireless.GetPrintableSignalStrength(iwconfig, fast)), str(wireless.GetCurrentNetworkID(iwconfig, fast))] elif state == misc.WIRED: self.reconnect_tries = 0 info = [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) self.last_state = state return True 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 > 2 and \ time.time() - self.last_reconnect_time < 30: 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, self.fast) if from_wireless and cur_net_id > -1: 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 rescan_networks(self): """ Calls a wireless scan. """ try: if daemon.GetSuspend(): return True wireless.Scan() daemon.SendScanSignal() except dbus.exceptions.DBusException: print 'dbus exception while attempting rescan' finally: return True 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 every two seconds, and sets a wireless scan to be called every two minutes. """ monitor = ConnectionStatus() gobject.timeout_add(2000, monitor.update_connection_status) gobject.timeout_add(120000, monitor.rescan_networks) mainloop = gobject.MainLoop() mainloop.run() if __name__ == '__main__': main()