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05a59fb5dba42f3771110a520393fb5181afd65a
wicd/wnettools.py
imdano 05a59fb5db Experimental/Testing: 
- Improved behavior in the networking backend.  The wired/wireless wnettools instances now refer to each other, and get passed on to connection threads as well, which simplifies passing settings for external program usage.  Also removed some unecessary creating of duplicate wnettools instances which ended up causing some issues.
- Fixed bug where dhclient was being used as the dhcp client even if it was selected in the options menu.
- Fixed a typo in the connection commands used for ralink cards.
- Fixed the wrong cli option for releasing a dhcpcd lease.
- Monitor.py no longer calls for an auto-rescan if the daemon is currently connecting to a network.
- Cleaned up some comments and simplified the logic in a few methods/functions.
2008-06-19 22:09:39 +00:00

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#!/usr/bin/env python
""" Network interface control tools for wicd.
This module implements functions to control and obtain information from
network interfaces.
def SetDNS() -- Set the DNS servers of the system.
def GetWirelessInterfaces() -- Get the wireless interfaces available.
class Interface() -- Control a network interface.
class WiredInterface() -- Control a wired network interface.
class WirelessInterface() -- Control a wireless network interface.
"""
#
# Copyright (C) 2007 Adam Blackburn
# Copyright (C) 2007 Dan O'Reilly
# Copyright (C) 2007 Byron Hillis
#
# 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 <http://www.gnu.org/licenses/>.
#
import misc
import re
import os
import wpath
import time
import socket
import fcntl
import struct
import array
# Compile the regex patterns that will be used to search the output of iwlist
# scan for info these are well tested, should work on most cards
essid_pattern = re.compile('.*ESSID:"(.*?)"\n', re.I | re.M | re.S)
ap_mac_pattern = re.compile('.*Address: (.*?)\n', re.I | re.M | re.S)
channel_pattern = re.compile('.*Channel:? ?(\d\d?)', re.I | re.M | re.S)
strength_pattern = re.compile('.*Quality:?=? ?(\d+)\s*/?\s*(\d*)', re.I | re.M | re.S)
# These next two look a lot a like, altstrength is for Signal level = xx/100,
# which is just an alternate way of displaying link quality, signaldbm is
# for displaying actual signal strength (-xx dBm).
altstrength_pattern = re.compile('.*Signal level:?=? ?(\d\d*)', re.I | re.M | re.S)
signaldbm_pattern = re.compile('.*Signal level:?=? ?(-\d\d*)', re.I | re.M | re.S)
mode_pattern = re.compile('.*Mode:(.*?)\n', re.I | re.M | re.S)
freq_pattern = re.compile('.*Frequency:(.*?)\n', re.I | re.M | re.S)
ip_pattern = re.compile(r'inet [Aa]d?dr[^.]*:([^.]*\.[^.]*\.[^.]*\.[0-9]*)', re.S)
wep_pattern = re.compile('.*Encryption key:(.*?)\n', re.I | re.M | re.S)
altwpa_pattern = re.compile('(wpa_ie)', re.I | re.M | re.S)
wpa1_pattern = re.compile('(WPA Version 1)', re.I | re.M | re.S)
wpa2_pattern = re.compile('(WPA2)', re.I | re.M | re.S)
# Patterns for wpa_cli output
auth_pattern = re.compile('.*wpa_state=(.*?)\n', re.I | re.M | re.S)
RALINK_DRIVER = 'ralink legacy'
SIOCGIWESSID = 0x8B1B
SIOCGIFADDR = 0x8915
SIOCGIWSTATS = 0x8B0F
SIOCGIFHWADDR = 0x8927
SIOCGMIIPHY = 0x8947
SIOCGETHTOOL = 0x8946
SIOCGIFFLAGS = 0x8913
SIOCGIWRANGE = 0x8B0B
SIOCGIWAP = 0x8B15
def SetDNS(dns1=None, dns2=None, dns3=None):
""" Set the DNS of the system to the specified DNS servers.
Opens up resolv.conf and writes in the nameservers.
Keyword arguments:
dns1 -- IP address of DNS server 1
dns2 -- IP address of DNS server 1
dns3 -- IP address of DNS server 1
"""
resolv = open("/etc/resolv.conf","w")
for dns in [dns1, dns2, dns3]:
if dns:
print 'Setting DNS : ' + dns
resolv.write('nameserver ' + dns + '\n')
resolv.close()
def GetDefaultGateway():
""" Attempts to determine the default gateway by parsing route -n. """
route_info = misc.Run("route -n")
lines = route_info.split('\n')
gateway = None
for line in lines:
words = line.split()
print words
if not words:
continue
if words[0] == '0.0.0.0':
gateway = words[1]
break
if not gateway:
print 'couldn\'t retrieve default gateway from route -n'
return gateway
def StopDHCP():
""" Stop the DHCP client. """
cmd = 'killall dhclient dhclient3 pump dhcpcd-bin'
misc.Run(cmd)
def GetWirelessInterfaces():
""" Get available wireless interfaces.
Attempts to get an interface first by parsing /proc/net/wireless,
and should that fail, by parsing iwconfig.
Returns:
The first interface available.
"""
iface = _fast_get_wifi_interfaces()
if not iface:
output = misc.Run('iwconfig')
iface = misc.RunRegex(re.compile('(\w*)\s*\w*\s*[a-zA-Z0-9.-_]*\s*(?=ESSID)',
re.I | re.M | re.S), output)
return iface
def _fast_get_wifi_interfaces():
""" Tries to get a wireless interface using /sys/class/net. """
dev_dir = '/sys/class/net/'
ifnames = []
ifnames = [iface for iface in os.listdir(dev_dir) if 'wireless' \
in os.listdir(dev_dir + iface)]
return bool(ifnames) and ifnames[0] or None
def get_iw_ioctl_result(iface, call):
""" Makes the given ioctl call and returns the results.
Keyword arguments:
call -- The ioctl call to make
Returns:
The results of the ioctl call.
"""
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
buff = array.array('c', '\0' * 32)
addr, length = buff.buffer_info()
arg = struct.pack('Pi', addr, length)
data = (iface + '\0' * 16)[:16] + arg
try:
result = fcntl.ioctl(s.fileno(), call, data)
except IOError:
return None
except OSError:
return None
return buff.tostring()
class Interface(object):
""" Control a network interface. """
def __init__(self, iface, verbose=False):
""" Initialise the object.
Keyword arguments:
iface -- the name of the interface
verbose -- whether to print every command run
"""
self.iface = iface
self.verbose = verbose
self.DHCP_CLIENT = None
self.DHCP_CMD = None
self.DHCP_RELEASE = None
self.MIITOOL_FOUND = False
self.ETHTOOL_FOUND = False
self.IP_FOUND = False
self.flush_tool = None
self.link_detect = None
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.Check()
def SetDebugMode(self, value):
""" If True, verbose output is enabled. """
self.verbose = value
def SetInterface(self, iface):
""" Sets the interface.
Keyword arguments:
iface -- the name of the interface.
"""
self.iface = str(iface)
def _find_client_path(self, client):
""" Determines the full path for the given program.
Searches a hardcoded list of paths for a given program name.
Keyword arguments:
client -- The name of the program to search for
Returns:
The full path of the program or None
"""
paths = ['/sbin/', '/usr/sbin/', '/bin/', '/usr/bin/',
'/usr/local/sbin/', '/usr/local/bin/']
for path in paths:
if os.access("%s%s" % (path, client), os.F_OK):
return "%s%s" % (path, client)
if self.verbose:
"WARNING: No path found for %s" % (client)
return None
def _client_found(self, client):
""" Searches for the existence of the given program in PATH.
Uses "which" to determine if a given program exists in PATH.
Returns:
True if the program exists, False otherwise.
"""
output = misc.Run("which " + client)
if output and not ("no " + client) in output:
return True
return False
def CheckDHCP(self):
""" Check for a valid DHCP client.
Checks for the existence of a supported DHCP client. If one is
found, the appropriate values for DHCP_CMD, DHCP_RELEASE, and
DHCP_CLIENT are set. If a supported client is not found, a
warning is printed.
"""
def get_client_name(cl):
""" Converts the integer value for a dhcp client to a string. """
if cl in [misc.DHCLIENT, "dhclient"]:
client = "dhclient"
elif cl in [misc.DHCPCD, "dhcpcd"]:
client = "dhcpcd"
else:
client = "pump"
return client
print 'checking dhcp...'
if self.DHCP_CLIENT:
dhcp_client = get_client_name(self.DHCP_CLIENT)
dhcp_path = self._find_client_path(dhcp_client)
if not dhcp_path:
print "WARNING: Could not find selected dhcp client. Wicd " + \
" will try to find another supported client."
if not self.DHCP_CLIENT or not dhcp_path:
dhcp_client = None
dhcp_path = None
dhcpclients = ["dhclient", "dhcpcd", "pump"]
for client in dhcpclients:
dhcp_path = self._find_client_path(client)
if dhcp_path:
dhcp_client = client
break
if not dhcp_client:
print "WARNING: No supported DHCP Client could be found!"
return
elif dhcp_client in [misc.DHCLIENT, "dhclient"]:
dhcp_client = misc.DHCLIENT
dhcp_cmd = dhcp_path
dhcp_release = dhcp_cmd + " -r"
elif dhcp_client in [misc.PUMP, "pump"]:
dhcp_client = misc.PUMP
dhcp_cmd = dhcp_path + " -i"
dhcp_release = dhcp_cmd + " -r -i"
elif dhcp_client in [misc.DHCPCD, "dhcpcd"]:
dhcp_client = misc.DHCPCD
dhcp_cmd = dhcp_path
dhcp_release = dhcp_cmd + " -k"
else:
dhcp_client = None
dhcp_cmd = None
dhcp_release = None
self.DHCP_CMD = dhcp_cmd
self.DHCP_RELEASE = dhcp_release
self.DHCP_CLIENT = dhcp_client
def CheckWiredTools(self):
""" Check for the existence of ethtool and mii-tool. """
miitool_path = self._find_client_path("mii-tool")
if miitool_path:
self.miitool_cmd = miitool_path
self.MIITOOL_FOUND = True
else:
self.miitool_cmd = None
self.MIITOOL_FOUND = False
ethtool_path = self._find_client_path("ethtool")
if ethtool_path:
self.ethtool_cmd = ethtool_path
self.ETHTOOL_FOUND = True
else:
self.ethtool_cmd = None
self.ETHTOOL_FOUND = False
def CheckWirelessTools(self):
""" Check for the existence of wpa_cli """
wpa_cli_path = self._find_client_path("wpa_cli")
if wpa_cli_path:
self.WPA_CLI_FOUND = True
else:
self.WPA_CLI_FOUND = False
print "wpa_cli not found. Authentication will not be validated."
def Check(self):
""" Check that all required tools are available. """
# THINGS TO CHECK FOR: ethtool, pptp-linux, dhclient, host
self.CheckDHCP()
self.CheckWiredTools()
self.CheckWirelessTools()
ip_path = self._find_client_path("ip")
if ip_path:
self.ip_cmd = ip_path
self.IP_FOUND = True
else:
self.ip_cmd = None
self.IP_FOUND = False
def Up(self):
""" Bring the network interface up.
Returns:
True
"""
cmd = 'ifconfig ' + self.iface + ' up'
if self.verbose: print cmd
misc.Run(cmd)
return True
def Down(self):
""" Take down the network interface.
Returns:
True
"""
cmd = 'ifconfig ' + self.iface + ' down'
if self.verbose: print cmd
misc.Run(cmd)
return True
def SetAddress(self, ip=None, netmask=None, broadcast=None):
""" Set the IP addresses of an interface.
Keyword arguments:
ip -- interface IP address in dotted quad form
netmask -- netmask address in dotted quad form
broadcast -- broadcast address in dotted quad form
"""
if not self.iface:
return
cmd = ''.join(['ifconfig ', self.iface, ' '])
if ip:
cmd = ''.join([cmd, ip, ' '])
if netmask:
cmd = ''.join([cmd, 'netmask ', netmask, ' '])
if broadcast:
cmd = ''.join([cmd, 'broadcast ', broadcast, ' '])
if self.verbose: print cmd
misc.Run(cmd)
def _parse_dhclient(self, pipe):
""" Parse the output of dhclient.
Parses the output of dhclient and returns the status of
the connection attempt.
Keyword arguments:
pipe -- stdout pipe to the dhcpcd process.
Returns:
'success' if succesful', an error code string otherwise.
"""
dhclient_complete = False
dhclient_success = False
while not dhclient_complete:
line = pipe.readline()
if line == '': # Empty string means dhclient is done.
dhclient_complete = True
else:
print line.strip('\n')
if line.startswith('bound'):
dhclient_success = True
dhclient_complete = True
return self._check_dhcp_result(dhclient_success)
def _parse_pump(self, pipe):
""" Determines if obtaining an IP using pump succeeded.
Keyword arguments:
pipe -- stdout pipe to the dhcpcd process.
Returns:
'success' if succesful, an error code string otherwise.
"""
pump_complete = False
pump_success = True
while not pump_complete:
line = pipe.readline()
if line == '':
pump_complete = True
elif line.strip().lower().startswith('Operation failed.'):
pump_success = False
pump_complete = True
print line
return self._check_dhcp_result(pump_success)
def _parse_dhcpcd(self, pipe):
""" Determines if obtaining an IP using dhcpcd succeeded.
Keyword arguments:
pipe -- stdout pipe to the dhcpcd process.
Returns:
'success' if succesful', an error code string otherwise.
"""
dhcpcd_complete = False
dhcpcd_success = True
while not dhcpcd_complete:
line = pipe.readline()
if line.startswith("Error"):
dhcpcd_success = False
dhcpcd_complete = True
elif line == '':
dhcpcd_complete = True
print line
return self._check_dhcp_result(dhcpcd_success)
def _check_dhcp_result(self, success):
""" Print and return the correct DHCP connection result.
Keyword Arguents:
success -- boolean specifying if DHCP was succesful.
Returns:
'success' if success == True, 'dhcp_failed' otherwise.
"""
if success:
print 'DHCP connection successful'
return 'success'
else:
print 'DHCP connection failed'
return 'dhcp_failed'
def StartDHCP(self):
""" Start the DHCP client to obtain an IP address.
Returns:
A string representing the result of the DHCP command. See
_check_dhcp_result for the possible values.
"""
cmd = self.DHCP_CMD + " " + self.iface
if self.verbose: print cmd
pipe = misc.Run(cmd, include_stderr=True, return_pipe=True)
DHCP_CLIENT = self.DHCP_CLIENT
if DHCP_CLIENT == misc.DHCLIENT:
return self._parse_dhclient(pipe)
elif DHCP_CLIENT == misc.PUMP:
return self._parse_pump(pipe)
elif DHCP_CLIENT == misc.DHCPCD:
return self._parse_dhcpcd(pipe)
def ReleaseDHCP(self):
""" Release the DHCP lease for this interface. """
cmd = self.DHCP_RELEASE + " " + self.iface
misc.Run(cmd)
def FlushRoutes(self):
""" Flush all network routes. """
if not self.iface:
return
if self.IP_FOUND and self.flush_tool != misc.ROUTE:
cmd = "ip route flush dev " + self.iface
else:
cmd = 'route del dev ' + self.iface
if self.verbose: print cmd
misc.Run(cmd)
def SetDefaultRoute(self, gw):
""" Add a default route with the specified gateway.
Keyword arguments:
gw -- gateway of the default route in dotted quad form
"""
cmd = 'route add default gw ' + gw
if self.verbose: print cmd
misc.Run(cmd)
def GetIP(self, fast=False):
""" Get the IP address of the interface.
Returns:
The IP address of the interface in dotted quad form.
"""
if fast:
return self._fast_get_ip()
cmd = 'ifconfig ' + self.iface
if self.verbose: print cmd
output = misc.Run(cmd)
return misc.RunRegex(ip_pattern, output)
def _fast_get_ip(self):
""" Gets the IP Address of the interface using ioctl.
Using ioctl calls to get the IP Address info is MUCH faster
than calling ifconfig and paring it's output. It's less
portable though, so there may be problems with it on some
systems.
"""
ifstruct = struct.pack('256s', self.iface)
try:
raw_ip = fcntl.ioctl(self.sock.fileno(), SIOCGIFADDR, ifstruct)
except IOError:
return None
except OSError:
return None
return socket.inet_ntoa(raw_ip[20:24])
def IsUp(self, fast=True):
""" Determines if the interface is up.
Returns:
True if the interface is up, False otherwise.
"""
if fast:
return self._fast_is_up()
cmd = "ifconfig " + self.iface
output = misc.Run(cmd)
lines = output.split('\n')
if len(lines) < 5:
return False
for line in lines[1:4]:
if line.strip().startswith('UP'):
return True
return False
def _fast_is_up(self):
""" Determines if the interfae is up using an ioctl call. """
data = (self.iface + '\0' * 16)[:18]
try:
result = fcntl.ioctl(self.sock.fileno(), SIOCGIFFLAGS, data)
except IOError, e:
if self.verbose:
print "SIOCGIFFLAGS failed: " + str(e)
return False
flags, = struct.unpack('H', result[16:18])
return bool(flags & 1)
class WiredInterface(Interface):
""" Control a wired network interface. """
def __init__(self, iface, verbose=False):
""" Initialise the wired network interface class.
Keyword arguments:
iface -- name of the interface
verbose -- print all commands
"""
Interface.__init__(self, iface, verbose)
def GetPluggedIn(self, fast=False):
""" Get the current physical connection state.
The method will first attempt to use ethtool do determine
physical connection state. Should ethtool fail to run properly,
mii-tool will be used instead.
Returns:
True if a link is detected, False otherwise.
"""
if not self.iface:
return False
if self.ETHTOOL_FOUND and self.link_detect != misc.MIITOOL:
return self._eth_get_plugged_in(fast)
elif self.MIITOOL_FOUND:
return self._mii_get_plugged_in(fast)
else:
print 'Error: No way of checking for a wired connection. Make \
sure that either mii-tool or ethtool is installed.'
return False
def _eth_get_plugged_in(self, fast):
""" Use ethtool to determine the physical connection state.
Returns:
True if a link is detected, False otherwise.
"""
if fast:
self._fast_eth_get_plugged_in()
link_tool = 'ethtool'
if not self.IsUp():
print 'Wired Interface is down, putting it up'
self.Up()
time.sleep(6)
tool_data = misc.Run(link_tool + ' ' + self.iface, True)
if misc.RunRegex(re.compile('(Link detected: yes)', re.I | re.M |
re.S), tool_data) is not None:
return True
else:
return False
def _fast_eth_get_plugged_in(self):
""" Determines link connection status using an ioctl call.
Uses the SIOCGETHTOOL ioctl call to determine link status.
Returns:
True if a wire is plugged in, False otherwise.
"""
if not self.IsUp():
self.Up()
time.sleep(5)
buff = array.array('i', [0x0000000a, 0x00000000])
addr, length = buff.buffer_info()
arg = struct.pack('Pi', addr, length)
data = (self.iface + '\0' * 16)[:16] + arg
try:
fcntl.ioctl(self.sock.fileno(), SIOCGETHTOOL, data)
except IOError, e:
if self.verbose:
print 'SIOCGETHTOOL failed: ' + str(e)
return False
return bool(buff.tolist()[1])
def _mii_get_plugged_in(self, fast):
""" Use mii-tool to determine the physical connection state.
Returns:
True if a link is detected, False otherwise.
"""
if fast:
return self._fast_mii_get_plugged_in()
link_tool = 'mii-tool'
tool_data = misc.Run(link_tool + ' ' + self.iface, True)
if misc.RunRegex(re.compile('(Invalid argument)', re.I | re.M | re.S),
tool_data) is not None:
print 'Wired Interface is down, putting it up'
self.Up()
time.sleep(4)
tool_data = misc.Run(link_tool + ' ' + self.iface, True)
if misc.RunRegex(re.compile('(link ok)', re.I | re.M | re.S),
tool_data) is not None:
return True
else:
return False
def _fast_mii_get_plugged_in(self):
""" Get link status using the SIOCGMIIPHY ioctl call. """
if not self.IsUp():
self.Up()
time.sleep(2.5)
buff = struct.pack('16shhhh', (self.iface + '\0' * 16)[:16], 0, 1,
0x0004, 0)
try:
result = fcntl.ioctl(self.sock.fileno(), SIOCGMIIPHY, buff)
except IOError, e:
if self.verbose:
print 'SIOCGMIIPHY failed: ' + str(e)
return False
reg = struct.unpack('16shhhh', result)[-1]
return bool(reg & 0x0004)
class WirelessInterface(Interface):
""" Control a wireless network interface. """
def __init__(self, iface, verbose=False, wpa_driver='wext'):
""" Initialise the wireless network interface class.
Keyword arguments:
iface -- name of the interface
verbose -- print all commands
"""
Interface.__init__(self, iface, verbose)
self.wpa_driver = wpa_driver
def SetWpaDriver(self, driver):
""" Sets the wpa_driver. """
self.wpa_driver = driver
def SetEssid(self, essid):
""" Set the essid of the wireless interface.
Keyword arguments:
essid -- essid to set the interface to
"""
cmd = 'iwconfig %s essid "%s"' % (self.iface, essid)
if self.verbose: print cmd
misc.Run(cmd)
def StopWPA(self):
""" Stop wireless encryption. """
cmd = 'killall wpa_supplicant'
if self.verbose: print cmd
misc.Run(cmd)
def GetKillSwitchStatus(self):
""" Determines if the wireless killswitch is enabled.
Returns:
True if the killswitch is enabled, False otherwise.
"""
output = misc.Run("iwconfig " + self.iface)
killswitch_pattern = re.compile('.*radio off', re.I | re.M | re.S)
if killswitch_pattern.search(output):
radiostatus = True
else:
radiostatus = False
return radiostatus
def GetIwconfig(self):
""" Returns the output of iwconfig for this interface. """
return misc.Run("iwconfig " + self.iface)
def GetNetworks(self):
""" Get a list of available wireless networks.
Returns:
A list containing available wireless networks.
"""
cmd = 'iwlist ' + self.iface + ' scan'
if self.verbose: print cmd
results = misc.Run(cmd)
# Split the networks apart, using Cell as our split point
# this way we can look at only one network at a time.
# The spaces around ' Cell ' are to minimize the chance that someone
# has an essid named Cell...
networks = results.split( ' Cell ' )
# Get available network info from iwpriv get_site_survey
# if we're using a ralink card (needed to get encryption info)
if self.wpa_driver == RALINK_DRIVER:
ralink_info = self._GetRalinkInfo()
else:
ralink_info = None
# An array for the access points
access_points = []
for cell in networks:
# Only use sections where there is an ESSID.
if 'ESSID:' in cell:
# Add this network to the list of networks
entry = self._ParseAccessPoint(cell, ralink_info)
if entry is not None:
access_points.append(entry)
return access_points
def _FreqToChannel(self, freq):
""" Translate the specified frequency to a channel.
Note: This function is simply a lookup dict and therefore the
freq argument must be in the dict to provide a valid channel.
Keyword arguments:
freq -- string containing the specified frequency
Returns:
The channel number, or None if not found.
"""
ret = None
freq_dict = {'2.412 GHz': 1, '2.417 GHz': 2, '2.422 GHz': 3,
'2.427 GHz': 4, '2.432 GHz': 5, '2.437 GHz': 6,
'2.442 GHz': 7, '2.447 GHz': 8, '2.452 GHz': 9,
'2.457 GHz': 10, '2.462 GHz': 11, '2.467 GHz': 12,
'2.472 GHz': 13, '2.484 GHz': 14 }
try:
ret = freq_dict[freq]
except KeyError:
print "Couldn't determine channel number for frequency: " + freq
return ret
def _GetRalinkInfo(self):
""" Get a network info list used for ralink drivers
Calls iwpriv <wireless interface> get_site_survey, which
on some ralink cards will return encryption and signal
strength info for wireless networks in the area.
"""
iwpriv = misc.Run('iwpriv ' + self.iface + ' get_site_survey')
lines = iwpriv.splitlines()
lines = lines[2:]
return lines
def _ParseAccessPoint(self, cell, ralink_info):
""" Parse a single cell from the output of iwlist.
Keyword arguments:
cell -- string containing the cell information
ralink_info -- string contating network information needed
for ralink cards.
Returns:
A dictionary containing the cell networks properties.
"""
ap = {}
# ESSID - Switch '<hidden>' to 'Hidden' to remove
# brackets that can mix up formatting.
ap['essid'] = misc.RunRegex(essid_pattern, cell)
try:
ap['essid'] = misc.to_unicode(ap['essid'])
except (UnicodeDecodeError, UnicodeEncodeError):
print 'Unicode problem with current network essid, ignoring!!'
return None
if ap['essid'] == '<hidden>':
ap['essid'] = 'Hidden'
ap['hidden'] = True
else:
ap['hidden'] = False
# Channel - For cards that don't have a channel number,
# convert the frequency.
ap['channel'] = misc.RunRegex(channel_pattern, cell)
if ap['channel'] == None:
freq = misc.RunRegex(freq_pattern, cell)
ap['channel'] = self._FreqToChannel(freq)
# BSSID
ap['bssid'] = misc.RunRegex(ap_mac_pattern, cell)
# Mode
ap['mode'] = misc.RunRegex(mode_pattern, cell)
# Break off here if we're using a ralink card
if self.wpa_driver == RALINK_DRIVER:
ap = self._ParseRalinkAccessPoint(ap, ralink_info, cell)
elif misc.RunRegex(wep_pattern, cell) == 'on':
# Encryption - Default to WEP
ap['encryption'] = True
ap['encryption_method'] = 'WEP'
if misc.RunRegex(wpa1_pattern, cell) == 'WPA Version 1':
ap['encryption_method'] = 'WPA'
if misc.RunRegex(altwpa_pattern, cell) == 'wpa_ie':
ap['encryption_method'] = 'WPA'
if misc.RunRegex(wpa2_pattern, cell) == 'WPA2':
ap['encryption_method'] = 'WPA2'
else:
ap['encryption'] = False
# Link Quality
# Set strength to -1 if the quality is not found
# more of the patch from
# https://bugs.launchpad.net/wicd/+bug/175104
if (strength_pattern.match(cell)):
[(strength, max_strength)] = strength_pattern.findall(cell)
if max_strength:
ap["quality"] = 100 * int(strength) // int(max_strength)
else:
ap["quality"] = int(strength)
elif misc.RunRegex(altstrength_pattern,cell):
ap['quality'] = misc.RunRegex(altstrength_pattern, cell)
else:
ap['quality'] = -1
# Signal Strength (only used if user doesn't want link
# quality displayed or it isn't found)
if misc.RunRegex(signaldbm_pattern, cell):
ap['strength'] = misc.RunRegex(signaldbm_pattern, cell)
elif self.wpa_driver != RALINK_DRIVER: # This is already set for ralink
ap['strength'] = -1
return ap
def _ParseRalinkAccessPoint(self, ap, ralink_info, cell):
""" Parse encryption and signal strength info for ralink cards
Keyword arguments:
ap -- array containing info about the current access point
ralink_info -- string containing available network info
cell -- string containing cell information
Returns:
Updated array containing info about the current access point
"""
lines = ralink_info
for x in lines: # Iterate through all networks found
info = x.split()
# Make sure we read in a valid entry
if len(info) < 5 or info == None or info == '':
break
if info[2] == ap['essid']:
if misc.RunRegex(wep_pattern, cell) == 'on':
ap['encryption'] = True
if info[5] == 'WEP' or (
(info[5] == 'OPEN' or info[5] == 'SHARED') and
info[4] == 'WEP'):
ap['encryption_method'] = 'WEP'
elif info[5] == 'WPA-PSK':
ap['encryption_method'] = 'WPA'
elif info[5] == 'WPA2-PSK':
ap['encryption_method'] = 'WPA2'
else:
print 'Unknown AuthMode, can\'t assign encryption_method!!'
ap['encryption_method'] = 'Unknown'
else:
ap['encryption'] = False
# Set signal strength here (in dBm, not %),
# ralink drivers don't return link quality
ap['strength'] = info[1]
return ap
def SetMode(self, mode):
""" Set the mode of the wireless interface.
Keyword arguments:
mode -- mode to set the interface to
"""
if mode.lower() == 'master':
mode = 'managed'
cmd = 'iwconfig %s mode %s' % (self.iface, mode)
if self.verbose: print cmd
misc.Run(cmd)
def SetChannel(self, channel):
""" Set the channel of the wireless interface.
Keyword arguments:
channel -- channel to set the interface to
"""
cmd = 'iwconfig %s channel %s' % (self.iface, str(channel))
if self.verbose: print cmd
misc.Run(cmd)
def SetKey(self, key):
""" Set the encryption key of the wireless interface.
Keyword arguments:
key -- encryption key to set
"""
cmd = 'iwconfig %s key %s' % (self.iface, key)
if self.verbose: print cmd
misc.Run(cmd)
def Associate(self, essid, channel=None, bssid=None):
""" Associate with the specified wireless network.
Keyword arguments:
essid -- essid of the network
channel -- channel of the network
bssid -- bssid of the network
"""
cmd = 'iwconfig %s essid "%s"' % (self.iface, essid)
if channel:
cmd = ''.join([cmd, ' channel ', str(channel)])
if bssid:
cmd = ''.join([cmd, ' ap ', bssid])
if self.verbose: print cmd
misc.Run(cmd)
def Authenticate(self, network):
""" Authenticate with the specified wireless network.
Keyword arguments:
network -- dictionary containing network info
"""
misc.ParseEncryption(network)
if self.wpa_driver == RALINK_DRIVER:
self._AuthenticateRalinkLegacy(network)
else:
cmd = ''.join(['wpa_supplicant -B -i ', self.iface, ' -c "',
wpath.networks, network['bssid'].replace(':','').lower(),
'" -D ', self.wpa_driver])
if self.verbose: print cmd
misc.Run(cmd)
def ValidateAuthentication(self, auth_time):
""" Validate WPA authentication.
Validate that the wpa_supplicant authentication
process was successful.
NOTE: It's possible this could return False,
though in reality wpa_supplicant just isn't
finished yet.
Keyword arguments:
auth_time -- The time at which authentication began.
Returns:
True if wpa_supplicant authenticated succesfully,
False otherwise.
"""
# Right now there's no way to do this for these drivers
if self.wpa_driver == RALINK_DRIVER or not self.WPA_CLI_FOUND:
return True
MAX_TIME = 15
MAX_DISCONNECTED_TIME = 3
while (time.time() - auth_time) < MAX_TIME:
cmd = 'wpa_cli -i ' + self.iface + ' status'
output = misc.Run(cmd)
result = misc.RunRegex(auth_pattern, output)
if self.verbose:
print 'WPA_CLI RESULT IS', result
if not result:
return False
if result == "COMPLETED":
return True
elif result == "DISCONNECTED" and \
(time.time() - auth_time) > MAX_DISCONNECTED_TIME:
# Force a rescan to get wpa_supplicant moving again.
self._ForceSupplicantScan()
MAX_TIME += 5
time.sleep(1)
print 'wpa_supplicant authentication may have failed.'
return False
def _ForceSupplicantScan(self):
""" Force wpa_supplicant to rescan available networks.
This function forces wpa_supplicant to rescan.
This works around authentication validation sometimes failing for
wpa_supplicant because it remains in a DISCONNECTED state for
quite a while, after which a rescan is required, and then
attempting to authenticate. This whole process takes a long
time, so we manually speed it up if we see it happening.
"""
print 'wpa_supplicant rescan forced...'
cmd = 'wpa_cli -i' + self.iface + ' scan'
misc.Run(cmd)
def _AuthenticateRalinkLegacy(self, network):
""" Authenticate with the specified wireless network.
This function handles Ralink legacy cards that cannot use
wpa_supplicant.
Keyword arguments:
network -- dictionary containing network info
"""
if network.get('key') != None:
lines = self._GetRalinkInfo()
for x in lines:
info = x.split()
if len(info) < 5:
break
if info[2] == network.get('essid'):
if info[5] == 'WEP' or (info[5] == 'OPEN' and \
info[4] == 'WEP'):
print 'Setting up WEP'
cmd = ''.join(['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('EncrypType=' + 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')
cmd_list.append('SSID=' + info[2])
for cmd in cmd_list:
cmd = 'iwpriv ' + self.iface + ' '
if self.verbose: print cmd
misc.Run(cmd)
def GetBSSID(self, fast=True):
""" Get the MAC address for the interface. """
if fast:
return self._fast_get_bssid()
else:
return ""
def _fast_get_bssid(self):
""" Gets the MAC address for the connected AP using ioctl calls. """
data = (self.iface + '\0' * 32)[:32]
try:
result = fcntl.ioctl(self.sock.fileno(), SIOCGIWAP, data)[16:]
except IOError, e:
if self.verbose:
print "SIOCGIWAP failed: " + str(e)
return ""
raw_addr = struct.unpack("xxBBBBBB", result[:8])
return "%02X:%02X:%02X:%02X:%02X:%02X" % raw_addr
def GetSignalStrength(self, iwconfig=None, fast=False):
""" Get the signal strength of the current network.
Returns:
The signal strength.
"""
if fast:
return self._get_signal_strength_fast()
if not iwconfig:
cmd = 'iwconfig ' + self.iface
if self.verbose: print cmd
output = misc.Run(cmd)
else:
output = iwconfig
[(strength, max_strength)] = strength_pattern.findall(output)
if max_strength and strength:
return 100 * int(strength) // int(max_strength)
if strength is None:
strength = misc.RunRegex(altstrength_pattern, output)
return strength
def _get_signal_strength_fast(self):
""" Get the link quality using ioctl calls. """
buff = get_iw_ioctl_result(self.iface, SIOCGIWSTATS)
strength = ord(buff[2])
max_strength = self._get_max_strength_fast()
if strength and max_strength:
return 100 * int(strength) // int(max_strength)
return strength
def _get_max_strength_fast(self):
""" Gets the maximum possible strength from the wireless driver. """
buff = array.array('c', '\0' * 700)
addr, length = buff.buffer_info()
arg = struct.pack('Pi', addr, length)
iwfreq = (self.iface + '\0' * 16)[:16] + arg
try:
result = fcntl.ioctl(self.sock.fileno(), SIOCGIWRANGE, iwfreq)
except IOError, e:
if self.verbose:
print "SIOCGIWRANGE failed: " + str(e)
return None
# This defines the iwfreq struct, used to get singal strength.
fmt = "iiihb6ii4B4Bi32i2i2i2i2i3h8h2b2bhi8i2b3h2i2ihB17x" + 32 * "ihbb"
size = struct.calcsize(fmt)
data = buff.tostring()
data = data[0:size]
values = struct.unpack(fmt, data)
return values[12]
def GetDBMStrength(self, iwconfig=None, fast=False):
""" Get the dBm signal strength of the current network.
Returns:
The dBm signal strength.
"""
if fast:
return self._get_dbm_strength_fast()
if iwconfig:
cmd = 'iwconfig ' + self.iface
if self.verbose: print cmd
output = misc.Run(cmd)
else:
output = iwconfig
dbm_strength = misc.RunRegex(signaldbm_pattern, output)
return dbm_strength
def _get_dbm_strength_fast(self):
""" Uses the SIOCGIWSTATS ioctl call to get dbm signal strength.
Returns:
The dBm signal strength or None if it can't be found.
"""
buff = misc.get_irwange_ioctl_result(self.iface, SIOCGIWSTATS)
if not buff:
return None
return str((ord(buff[3]) - 256))
def GetCurrentNetwork(self, iwconfig=None, fast=False):
""" Get the essid of the current network.
Returns:
The current network essid.
"""
if fast:
return self._get_essid_fast()
if not iwconfig:
cmd = 'iwconfig ' + self.iface
if self.verbose: print cmd
output = misc.Run(cmd)
else:
output = iwconfig
network = misc.RunRegex(re.compile('.*ESSID:"(.*?)"',
re.I | re.M | re.S), output)
if network:
network = misc.to_unicode(network)
return network
def _get_essid_fast(self):
""" Get the current essid using ioctl. """
buff = get_iw_ioctl_result(self.iface, SIOCGIWESSID)
if not buff:
return None
return buff.strip('\x00')
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