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Split the networking module, moving the common tasks into wnettools.py
By splitting the common tasks performed by the networking module out into a separate set of classes, it is possible to reduce code duplication and improve the structure of the networking module. The wnettools module now performs _almost_ all the actual commands that control the network interfaces, splitting it from the actual connection logic contained in the networking module. Splitting these two tasks also allows for tool changes to be made in a central location, rather than spread throughout the networking.py file.
This commit is contained in:
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555
wnettools.py
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555
wnettools.py
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#!/usr/bin/env python
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""" Network interface control tools for wicd.
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This module implements functions to control and obtain information from
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network interfaces.
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def SetDNS() -- Set the DNS servers of the system.
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def GetWirelessInterfaces() -- Get the wireless interfaces available.
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class Interface() -- Control a network interface.
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class WiredInterface() -- Control a wired network interface.
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class WirelessInterface() -- Control a wireless network interface.
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"""
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#
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# Copyright (C) 2007 Adam Blackburn
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# Copyright (C) 2007 Dan O'Reilly
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# Copyright (C) 2007 Byron Hillis
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License Version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import misc
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import re
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import wpath
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# Compile the regex patterns that will be used to search the output of iwlist scan for info
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# these are well tested, should work on most cards
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essid_pattern = re.compile('.*ESSID:"(.*?)"\n', re.DOTALL | re.I | re.M | re.S)
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ap_mac_pattern = re.compile('.*Address: (.*?)\n',re.DOTALL | re.I | re.M | re.S)
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channel_pattern = re.compile('.*Channel:? ?(\d\d?)',re.DOTALL | re.I | re.M | re.S)
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strength_pattern = re.compile('.*Quality:?=? ?(\d\d*)',re.DOTALL | re.I | re.M | re.S)
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altstrength_pattern = re.compile('.*Signal level:?=? ?(\d\d*)',re.DOTALL | re.I | re.M | re.S)
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mode_pattern = re.compile('.*Mode:(.*?)\n',re.DOTALL | re.I | re.M | re.S)
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freq_pattern = re.compile('.*Frequency:(.*?)\n',re.DOTALL | re.I | re.M | re.S)
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ip_pattern = re.compile(r'inet [Aa]d?dr[^.]*:([^.]*\.[^.]*\.[^.]*\.[0-9]*)',re.S)
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wep_pattern = re.compile('.*Encryption key:(.*?)\n',re.DOTALL | re.I | re.M | re.S)
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altwpa_pattern = re.compile('(wpa_ie)',re.DOTALL | re.I | re.M | re.S)
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wpa1_pattern = re.compile('(WPA Version 1)',re.DOTALL | re.I | re.M | re.S)
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wpa2_pattern = re.compile('(WPA2)',re.DOTALL | re.I | re.M | re.S)
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def SetDNS(dns1=None, dns2=None, dns3=None):
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""" Set the DNS of the system to the specified DNS servers.
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Opens up resolv.conf and writes in the nameservers.
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Keyword arguments:
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dns1 -- IP address of DNS server 1
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dns2 -- IP address of DNS server 1
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dns3 -- IP address of DNS server 1
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"""
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dns_ips = [dns1, dns2, dns3]
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resolv = open("/etc/resolv.conf","w")
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for dns in dns_ips:
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if dns:
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print 'Setting DNS : ' + dns
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resolv.write('nameserver ' + dns + '\n')
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resolv.close()
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def GetWirelessInterfaces():
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""" Get available wireless interfaces.
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Returns:
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The first interface available.
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"""
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return misc.RunRegex(
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re.compile('(\w*)\s*\w*\s*[a-zA-Z0-9.-_]*\s*(?=ESSID)', re.DOTALL | re.I | re.M | re.S),
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misc.Run('iwconfig'))
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class Interface(object):
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""" Control a network interface. """
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def __init__(self, iface, verbose=True):
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""" Initialise the object.
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Keyword arguments:
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iface -- the name of the interface
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verbose -- whether to print every command run
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"""
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self.iface = iface
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self.verbose = verbose
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def Check(self):
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""" Check that all required tools are available."""
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# TODO: Implement this function.
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pass
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def Up(self):
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""" Bring the network interface up. """
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cmd = 'ifconfig ' + self.iface + ' up'
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if self.verbose: print cmd
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misc.Run(cmd)
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def Down(self):
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""" Take down the network interface. """
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cmd = 'ifconfig ' + self.iface + ' down'
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if self.verbose: print cmd
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misc.Run(cmd)
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def SetAddress(self, ip=None, netmask=None, broadcast=None):
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""" Set the IP addresses of an interface.
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Keyword arguments:
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ip -- interface IP address in dotted quad form
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netmask -- netmask address in dotted quad form
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broadcast -- broadcast address in dotted quad form
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"""
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cmd = 'ifconfig ' + self.iface + ' '
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if ip:
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cmd += ip + ' '
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if netmask:
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cmd += 'netmask ' + netmask + ' '
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if broadcast:
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cmd += 'broadcast ' + broadcast + ' '
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if self.verbose: print cmd
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misc.Run(cmd)
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def StartDHCP(self):
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""" Start the DHCP client to obtain an IP address. """
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cmd = 'dhclient ' + self.iface
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if self.verbose: print cmd
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misc.Run(cmd)
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def StopDHCP(self):
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""" Stop the DHCP client. """
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cmd = 'killall dhclient dhclient3'
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if self.verbose: print cmd
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misc.Run(cmd)
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def FlushRoutes(self):
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""" Flush all network routes. """
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cmd = 'ip route flush dev ' + self.iface
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if self.verbose: print cmd
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misc.Run(cmd)
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def SetDefaultRoute(self, gw):
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""" Add a default route with the specified gateway.
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Keyword arguments:
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gw -- gateway of the default route in dotted quad form
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"""
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cmd = 'route add default gw ' + gw
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if self.verbose: print cmd
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misc.Run(cmd)
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def GetIP(self):
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""" Get the IP address of the interface.
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Returns:
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The IP address of the interface in dotted quad form.
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"""
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cmd = 'ifconfig ' + self.iface
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if self.verbose: print cmd
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output = misc.Run(cmd)
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return misc.RunRegex(ip_pattern,output)
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class WiredInterface(Interface):
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""" Control a wired network interface. """
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def __init__(self, iface, verbose=True):
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""" Initialise the wired network interface class.
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Keyword arguments:
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iface -- name of the interface
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verbose -- print all commands
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"""
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Interface.__init__(self, iface, verbose)
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def GetPluggedIn(self):
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""" Get the current physical connection state. """
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mii_tool_data = misc.Run( 'mii-tool ' + self.iface,True)
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if not misc.RunRegex(re.compile('(Invalid argument)',re.DOTALL | re.I | re.M | re.S),mii_tool_data) == None:
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print 'wired interface appears down, putting up for mii-tool check'
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misc.Run( 'ifconfig ' + self.iface + ' up' )
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mii_tool_data = misc.Run( 'mii-tool ' + self.iface)
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if not misc.RunRegex(re.compile('(link ok)',re.DOTALL | re.I | re.M | re.S),mii_tool_data) == None:
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return True
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else:
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return False
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class WirelessInterface(Interface):
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""" Control a wireless network interface. """
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def __init__(self, iface, verbose=True, wpa_driver='wext'):
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""" Initialise the wireless network interface class.
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Keyword arguments:
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iface -- name of the interface
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verbose -- print all commands
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"""
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Interface.__init__(self, iface, verbose)
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self.wpa_driver = wpa_driver
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def SetEssid(self, essid):
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""" Set the essid of the wireless interface.
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Keyword arguments:
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essid -- essid to set the interface to
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"""
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cmd = 'iwconfig ' + self.wireless_interface + ' essid "' + essid + '"'
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if self.verbose: print cmd
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misc.Run(cmd)
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def StopWPA(self):
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""" Stop wireless encryption. """
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cmd = 'killall wpa_supplicant'
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if self.verbose: print cmd
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misc.Run(cmd)
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def GetNetworks(self):
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""" Get a list of available wireless networks.
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Returns:
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A list containing available wireless networks.
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"""
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cmd = 'iwlist ' + self.iface + ' scan'
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if self.verbose: print cmd
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results = misc.Run(cmd)
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# Split the networks apart, using Cell as our split point
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# this way we can look at only one network at a time
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networks = results.split( ' Cell ' )
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# An array for the access points
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access_points = []
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for cell in networks:
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# Only use sections where there is an ESSID.
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if cell.count('ESSID:') > 0:
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# Add this network to the list of networks
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access_points.append(self._ParseAccessPoint(cell))
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return access_points
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def _FreqToChannel(self, freq):
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""" Translate the specified frequency to a channel.
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Note: This function is simply a lookup table and therefore the
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freq argument must be in the table to provide a valid channel.
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Keyword arguments:
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freq -- string containing the specified frequency
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Returns:
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The channel number, or None if not found.
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"""
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if freq == '2.412 GHz': return 1
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elif freq == '2.417 GHz': return 2
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elif freq == '2.422 GHz': return 3
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elif freq == '2.427 GHz': return 4
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elif freq == '2.432 GHz': return 5
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elif freq == '2.437 GHz': return 6
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elif freq == '2.442 GHz': return 7
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elif freq == '2.447 GHz': return 8
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elif freq == '2.452 GHz': return 9
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elif freq == '2.457 GHz': return 10
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elif freq == '2.462 GHz': return 11
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elif freq == '2.467 GHz': return 12
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elif freq == '2.472 GHz': return 13
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elif freq == '2.484 GHz': return 14
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else:
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print 'Couldn\'t determine channel number for current network - ' + freq
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return None
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def _ParseAccessPoint(self, cell):
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""" Parse a single cell from the output of iwlist.
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Keyword arguments:
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cell -- string containing the cell information
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Returns:
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A dictionary containing the cell networks properties.
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"""
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ap = {}
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# ESSID - Switch '<hidden>' to 'Hidden' to remove
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# brackets that can mix up formatting.
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ap['essid'] = misc.RunRegex(essid_pattern, cell)
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if ap['essid'] == '<hidden>':
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ap['essid'] = 'Hidden'
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ap['hidden'] = True
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else:
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ap['hidden'] = False
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# Channel - For cards that don't have a channel number,
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# convert the frequency.
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ap['channel'] = misc.RunRegex(channel_pattern, cell)
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if ap['channel'] == None:
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freq = misc.RunRegex(freq_pattern, cell)
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ap['channel'] = self._FreqToChannel(freq)
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# BSSID
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ap['bssid'] = misc.RunRegex(ap_mac_pattern, cell)
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# Mode
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ap['mode'] = misc.RunRegex(mode_pattern, cell)
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# Encryption - Default to WEP
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if misc.RunRegex(wep_pattern, cell) == 'on':
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if self.wpa_driver != 'ralink legacy':
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ap['encryption'] = True
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ap['encryption_method'] = 'WEP'
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if misc.RunRegex(wpa1_pattern,cell) == 'WPA Version 1':
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ap['encryption_method'] = 'WPA'
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if misc.RunRegex(altwpa_pattern,cell) == 'wpa_ie':
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ap['encryption_method'] = 'WPA'
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if misc.RunRegex(wpa2_pattern,cell) == 'WPA2':
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ap['encryption_method'] = 'WPA2'
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# Support for ralink legacy drivers (maybe only serialmonkey enhanced),
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# may not work w/ hidden networks
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else:
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iwpriv = misc.Run('iwpriv ' + self.wireless_interface + ' get_site_survey')
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lines = iwpriv.splitlines()
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lines = lines[2:]
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for x in lines: # Iterate through all networks found
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info = x.split()
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if len(info) < 5 or info == None or info == '': # Make sure we read in a valid entry
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break;
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if info[2] == ap['essid']:
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ap['encryption'] = True
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if info[5] == 'WEP' or (
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(info[5] == 'OPEN' or info[5] == 'SHARED') and
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info[4] == 'WEP'):
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ap['encryption_method'] = 'WEP'
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elif info[5] == 'WPA-PSK':
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ap['encryption_method'] = 'WPA'
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elif info[5] == 'WPA2-PSK':
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ap['encryption_method'] = 'WPA2'
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else:
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print 'Unknown AuthMode, can\'t assign encryption_method!!'
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ap['encryption_method'] = 'Unknown'
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# Set signal strength here (in dBm, not %)
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ap['quality'] = info[1][1:]
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else:
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ap['encryption'] = False
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if self.wpa_driver != 'ralink legacy':
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# Set strength to -1 if the quality is not found
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if misc.RunRegex(strength_pattern,cell):
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ap['quality'] = misc.RunRegex(strength_pattern,cell)
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elif misc.RunRegex(altstrength_pattern,cell):
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ap['quality'] = misc.RunRegex(altstrength_pattern,cell)
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else:
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ap['quality'] = -1
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return ap
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def SetMode(self, mode):
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""" Set the mode of the wireless interface.
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Keyword arguments:
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mode -- mode to set the interface to
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"""
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if mode.lower() == 'master':
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mode = 'managed'
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cmd = 'iwconfig ' + self.iface + ' mode ' + mode
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if self.verbose: print cmd
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results = misc.Run(cmd)
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def SetChannel(self, channel):
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""" Set the channel of the wireless interface.
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Keyword arguments:
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channel -- channel to set the interface to
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"""
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cmd = 'iwconfig ' + self.iface + ' channel ' + str(channel)
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if self.verbose: print cmd
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results = misc.Run(cmd)
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def SetKey(self, key):
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""" Set the encryption key of the wireless interface.
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Keyword arguments:
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key -- encryption key to set
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"""
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cmd = 'iwconfig ' + self.iface + ' key ' + key
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if self.verbose: print cmd
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results = misc.Run(cmd)
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def Associate(self, essid, channel=None, bssid=None):
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""" Associate with the specified wireless network.
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Keyword arguments:
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essid -- essid of the network
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channel -- channel of the network
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bssid -- bssid of the network
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"""
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cmd = 'iwconfig ' + self.iface + ' essid "' + essid + '"'
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if channel:
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cmd += ' channel ' + str(channel)
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if bssid:
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cmd += ' ap ' + bssid
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if self.verbose: print cmd
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results = misc.Run(cmd)
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def Authenticate(self, network):
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""" Authenticate with the specified wireless network.
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Keyword arguments:
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network -- dictionary containing network info
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"""
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misc.ParseEncryption(network)
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if self.wpa_driver == 'ralink legacy':
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_AuthenticateRalinkLegacy(network)
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else:
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cmd = ('wpa_supplicant -B -i ' + self.iface + ' -c "'
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+ wpath.networks + network['bssid'].replace(':','').lower()
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+ '" -D ' + self.wpa_driver)
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if self.verbose: print cmd
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misc.Run(cmd)
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def _AuthenticateRalinkLegacy(self, network):
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""" Authenticate with the specified wireless network.
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This function handles Ralink legacy cards that cannot use
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wpa_supplicant.
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Keyword arguments:
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network -- dictionary containing network info
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"""
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if network.get('key') != None:
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iwpriv = misc.Run('iwpriv ' + self.iface + ' get_site_survey')
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lines = iwpriv.splitlines()
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lines = lines[2:]
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for x in lines:
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info = x.split()
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if len(info) < 5:
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break
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if info[2] == network.get('essid'):
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if info[5] == 'WEP' or (info[5] == 'OPEN' and info[4] == 'WEP'): # Needs to be tested
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print 'Setting up WEP'
|
||||
cmd = 'iwconfig ' + self.iface + ' key ' + network.get('key')
|
||||
if self.verbose: print cmd
|
||||
misc.Run(cmd)
|
||||
else:
|
||||
if info[5] == 'SHARED' and info[4] == 'WEP':
|
||||
print 'Setting up WEP'
|
||||
auth_mode = 'SHARED'
|
||||
key_name = 'Key1'
|
||||
elif info[5] == 'WPA-PSK':
|
||||
print 'Setting up WPA-PSK'
|
||||
auth_mode = 'WPAPSK'
|
||||
key_name = 'WPAPSK'
|
||||
elif info[5] == 'WPA2-PSK':
|
||||
print 'Setting up WPA2-PSK'
|
||||
auth_mode = 'WPA2PSK'
|
||||
key_name = 'WPAPSK'
|
||||
else:
|
||||
print 'Unknown AuthMode, can\'t complete connection process!'
|
||||
return
|
||||
|
||||
cmd_list = []
|
||||
cmd_list.append('NetworkType=' + info[6])
|
||||
cmd_list.append('AuthMode=' + auth_mode)
|
||||
cmd_list.append('EncryptType=' + info[4])
|
||||
cmd_list.append('SSID=' + info[2])
|
||||
cmd_list.append(key_name + '=' + network.get('key'))
|
||||
if info[5] == 'SHARED' and info[4] == 'WEP':
|
||||
cmd_list.append('DefaultKeyID=1')
|
||||
#TODO: Confirm whether this second SSID set is required.
|
||||
cmd_list.append('SSID=' + info[2])
|
||||
|
||||
for cmd in cmd_list:
|
||||
cmd = 'iwpriv ' + self.iface + ' '
|
||||
if self.verbose: print cmd
|
||||
misc.Run(cmd)
|
||||
|
||||
|
||||
def GetSignalStrength(self):
|
||||
""" Get the signal strength of the current network.
|
||||
|
||||
Returns:
|
||||
The signal strength.
|
||||
|
||||
"""
|
||||
cmd = 'iwconfig ' + self.iface
|
||||
if self.verbose: print cmd
|
||||
output = misc.Run(cmd)
|
||||
strength = misc.RunRegex(strength_pattern,output)
|
||||
if strength == None:
|
||||
strength = misc.RunRegex(altstrength_pattern,output)
|
||||
|
||||
return strength
|
||||
|
||||
|
||||
def GetCurrentNetwork(self):
|
||||
""" Get the essid of the current network.
|
||||
|
||||
Returns:
|
||||
The current network essid.
|
||||
|
||||
"""
|
||||
cmd = 'iwconfig ' + self.iface
|
||||
if self.verbose: print cmd
|
||||
output = misc.Run(cmd)
|
||||
return misc.RunRegex(re.compile('.*ESSID:"(.*?)"',re.DOTALL | re.I | re.M | re.S), output)
|
||||
|
||||
Reference in New Issue
Block a user