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apc-b.py
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apc-b.py
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#!/usr/bin/python
__description__ = 'Tool to send beacon frames'
__author__ = 'Didier Stevens'
__version__ = '0.2.0'
__date__ = '2012/06/12'
"""
requires AirPCap drivers & API dll
Source code put in public domain by Didier Stevens, no Copyright
https://DidierStevens.com
Use at your own risk
History:
2008/06/18: start
2008/06/19: continue
2008/06/20: continue
2009/05/26: self.timestamp += 102400, cChannel
2009/05/29: channel hopping
2009/06/01: channel hopping
2012/06/12: version 0.2.0 nomap
Todo:
"""
import time
import ctypes
import struct
import optparse
import random
import sched
import zlib
import binascii
AIRPCAP_LT_802_11 = 1
AIRPCAP_LT_802_11_PLUS_PPI = 4
AIRPCAP_ERRBUF_SIZE = 512
AIRPCAP_READ_BUFFER_SIZE = 10240
AIRPCAP_ADAPTER = '\\\\.\\airpcap00'
NOMAP_SUFFIX = '_nomap'
def chomp(line):
if len(line) > 0 and line[-1] == '\n':
return line[:-1]
else:
return line
def file2strings(filename):
strings = []
try:
f = open(filename, 'r')
except:
return None
try:
for line in f:
strings += [chomp(line)]
finally:
f.close()
return strings
class cBeaconFrame:
"""Class for a beacon frame
"""
def __init__(self, ESSID, channel, BSSID=None):
self.ESSID = ESSID
self.channel = channel
if BSSID == None:
self.source_address = [0x00, 0x01, 0x02, 0x03, 0x04, random.randint(0, 255)]
self.bssid = [0x00, 0x01, 0x02, 0x03, 0x04, random.randint(0, 255)]
else:
self.source_address = [ord(b) for b in binascii.unhexlify(BSSID)]
self.bssid = self.source_address
self.sequence_number = 0
self.timestamp = 0
def make(self):
frame_control = [0x80, 0x00]
duration = [0x00, 0x00]
destination_address = [0xff, 0xff, 0xff, 0xff, 0xff, 0xff]
source_address = self.source_address
bssid = self.bssid
sequence = self.sequence_number * 16
segment_fragment_number = [sequence % 256, sequence / 256]
self.sequence_number = (self.sequence_number + 1) % 4096
timestamp = [ord(c) for c in struct.pack('<Q', self.timestamp)]
self.timestamp += 102400
beacon_interval = [0x64, 0x00]
capability_information = [0x01, 0x00]
param_essid = self.make_tag_string(0, self.ESSID)
param_supported_rates = self.make_tag(1, 8, [0x82, 0x84, 0x8b, 0x96, 0x0c, 0x12, 0x18, 0x24])
param_channel = self.make_tag(3, 1, [self.channel])
param_TIM = self.make_tag(5, 4, [0x00, 0x01, 0x00, 0x00])
self.frame = frame_control + duration + destination_address + source_address + bssid + segment_fragment_number + timestamp + beacon_interval + capability_information + param_essid + param_supported_rates + param_channel + param_TIM
def make_tag(self, id, len, data):
return [id, len] + data
def make_tag_string(self, id, data):
return [id, len(data)] + map(ord, data)
def get(self):
self.make()
c_beaconFrame = ctypes.create_string_buffer(len(self.frame))
for i, c in enumerate(self.frame):
c_beaconFrame[i] = chr(c)
return c_beaconFrame
def SendBeacons(sch, delay, hAPC, beacons, oChannel):
sch.enter(delay, 1, SendBeacons, [sch, delay, hAPC, beacons, oChannel])
oChannel.SetAirpcapChannel()
for oBeaconFrame in beacons:
c_beaconFrame = oBeaconFrame.get()
if ctypes.cdll.airpcap.AirpcapWrite(hAPC, c_beaconFrame, len(c_beaconFrame)) == 0:
print('Error AirpcapWrite %d' % ctypes.cdll.airpcap.AirpcapGetLastError(hAPC))
ctypes.cdll.airpcap.AirpcapClose(hAPC)
return
oChannel.Next()
class cChannel:
"""Channel Hopping Class
"""
def __init__(self, hAPC):
self.minimum = 1
self.maximum = 14
self.step = 5
self.counter = 0
self.AirpcapChannelSet = False
self.hAPC = hAPC
def Next(self):
self.counter = (self.counter + self.step) % (self.maximum - self.minimum + 1)
def Channel(self):
return self.counter + self.minimum
def SetChannel(self, channel):
self.counter = channel - self.minimum
def SetAirpcapChannel(self):
if self.step == 0 and self.AirpcapChannelSet:
return
if ctypes.cdll.airpcap.AirpcapSetDeviceChannel(self.hAPC, self.Channel()) == 0:
print('Error AirpcapSetDeviceChannel %s' % ctypes.cdll.airpcap.AirpcapGetLastError(self.hAPC))
ctypes.cdll.airpcap.AirpcapClose(self.hAPC)
return
self.AirpcapChannelSet = True
def CheckFCS(frame):
"""Return true when the FCS at the end of the frame is correct, i.e. the frame is not corrupted
"""
crc32 = zlib.crc32(frame[:-4])
fcs = struct.unpack('l', frame[-4:])[0]
return fcs == crc32
def ParsePacketBeacon(channel, raw_packet):
"""Parse a Beacon packet
"""
fmt_ppi = 'BBHL'
PpiPacketHeader = struct.unpack(fmt_ppi, raw_packet[0:struct.calcsize(fmt_ppi)])
if (CheckFCS(raw_packet[PpiPacketHeader[2]:])):
frame_control = struct.unpack('H', raw_packet[PpiPacketHeader[2]:PpiPacketHeader[2]+2])[0]
if frame_control & 0xf6 == 0x80:
fmt_ph = 'HH6s6s6sH'
probe_header = struct.unpack(fmt_ph, raw_packet[PpiPacketHeader[2]:PpiPacketHeader[2]+struct.calcsize(fmt_ph)])
parameters = raw_packet[PpiPacketHeader[2]+struct.calcsize(fmt_ph)+12:]
fmt_prm = 'BB'
parameter = struct.unpack(fmt_prm, parameters[0:struct.calcsize(fmt_prm)])
if parameter[0] == 0 and parameter[1] > 0 and parameter[1] < 33:
eth = ''
for i in range(0, 6):
eth = eth + '%02X' % ord(probe_header[3][i])
return (eth, parameters[2:2+parameter[1]], channel)
def Listen(listen, interval):
ca = ctypes.create_string_buffer(AIRPCAP_ADAPTER)
ce = ctypes.create_string_buffer(AIRPCAP_ERRBUF_SIZE)
hAPC = ctypes.cdll.airpcap.AirpcapOpen(ca.raw, ce)
if hAPC == 0:
print('Error opening adapter: %s' % repr(ce.raw))
return None
ctypes.cdll.airpcap.AirpcapTurnLedOff(hAPC, 0)
if ctypes.cdll.airpcap.AirpcapSetLinkType(hAPC, AIRPCAP_LT_802_11_PLUS_PPI) == 0:
print('Error AirpcapSetLinkType %s' % ctypes.cdll.airpcap.AirpcapGetLastError(hAPC))
ctypes.cdll.airpcap.AirpcapClose(hAPC)
return None
oChannel = cChannel(hAPC)
oChannel.SetAirpcapChannel()
hRead = ctypes.c_long(0)
if ctypes.cdll.airpcap.AirpcapGetReadEvent(hAPC, ctypes.pointer(hRead)) == 0:
print('Error AirpcapGetReadEvent %s' % ctypes.cdll.airpcap.AirpcapGetLastError(hAPC))
ctypes.cdll.airpcap.AirpcapClose(hAPC)
return None
c_PacketBuffer = ctypes.create_string_buffer(AIRPCAP_READ_BUFFER_SIZE)
BytesReceived = ctypes.c_long(0)
print('Listening for %ds:' % listen)
dESSIDs = {}
start = time.time()
try:
while time.time() - start <= listen:
# read captures and store in captures list
captureChannel = oChannel.Channel()
if ctypes.cdll.airpcap.AirpcapRead(hAPC, c_PacketBuffer, AIRPCAP_READ_BUFFER_SIZE, ctypes.pointer(BytesReceived)) == 0:
print('Error AirpcapRead %s' % ctypes.cdll.airpcap.AirpcapGetLastError(hAPC))
ctypes.cdll.airpcap.AirpcapClose(hAPC)
return None
captures = []
if BytesReceived.value > 0:
index = 0
while index < BytesReceived.value:
bpf_header = struct.unpack('LLLLH', c_PacketBuffer.raw[index:index+18])
captures.append([captureChannel, bpf_header, c_PacketBuffer.raw[index+bpf_header[4]:index+bpf_header[4]+bpf_header[2]]])
# calculate index next capture
index = index + bpf_header[4]
if bpf_header[2] % 4 == 0:
index = index + bpf_header[2]
else:
index = index + (bpf_header[2] / 4 + 1) * 4
# parse captures
for capture in captures:
beacondata = ParsePacketBeacon(capture[0], capture[2])
if beacondata:
if not beacondata[0] in dESSIDs:
print(' \'%s\': %s channel %d' % (beacondata[1], beacondata[0], beacondata[2]))
dESSIDs[beacondata[0]] = beacondata
# hop channel
oChannel.Next()
oChannel.SetAirpcapChannel()
time.sleep(interval)
except KeyboardInterrupt:
print('Interrupted by user')
result = []
for BSSID, values in dESSIDs.items():
if not values[1].endswith(NOMAP_SUFFIX) and len(values[1] + NOMAP_SUFFIX) <= 32:
result.append((values[1] + NOMAP_SUFFIX, values[0], values[2]))
ctypes.cdll.airpcap.AirpcapClose(hAPC)
return result
def Main():
"""Tool to send beacon frames
"""
oParser = optparse.OptionParser(usage='usage: %prog [options]', version='%prog ' + __version__)
oParser.add_option('-f', '--file', help='file with beacon ESSIDs')
oParser.add_option('-e', '--essid', default='default', help='beacon ESSID')
oParser.add_option('-c', '--channel', type=int, default=1, help='beacon channel')
oParser.add_option('-H', '--hop', action='store_true', default=False, help='do channel hopping')
oParser.add_option('-i', '--interval', default=0.5, type=float, help='interval in seconds between channel hops')
oParser.add_option('-l', '--listen', default=60, type=int, help='listening period (60s default)')
oParser.add_option('-n', '--nomap', action='store_true', default=False, help='send _nomap beacons')
(options, args) = oParser.parse_args()
if len(args) != 0:
oParser.print_help()
print('')
print(' %s' % __description__)
print(' Source code put in the public domain by Didier Stevens, no Copyright')
print(' Use at your own risk')
print(' https://DidierStevens.com')
else:
if options.nomap:
listenResult = Listen(options.listen, options.interval)
if listenResult == None or listenResult == []:
return
ca = ctypes.create_string_buffer(AIRPCAP_ADAPTER)
ce = ctypes.create_string_buffer(AIRPCAP_ERRBUF_SIZE)
hAPC = ctypes.cdll.airpcap.AirpcapOpen(ca.raw, ce)
if hAPC == 0:
print('Error opening adapter: %s' % repr(ce.raw))
return
ctypes.cdll.airpcap.AirpcapTurnLedOff(hAPC, 0)
if ctypes.cdll.airpcap.AirpcapSetLinkType(hAPC, AIRPCAP_LT_802_11) == 0:
print('Error AirpcapSetLinkType %s' % ctypes.cdll.airpcap.AirpcapGetLastError(hAPC))
ctypes.cdll.airpcap.AirpcapClose(hAPC)
return
try:
if options.nomap:
beacons = [cBeaconFrame(beacon[0], beacon[2], beacon[1]) for beacon in listenResult]
elif options.file == None:
beacons = [cBeaconFrame(options.essid, options.channel)]
else:
ESSIDs = file2strings(options.file)
if ESSIDs == None:
print('Error reading file', options.file)
ctypes.cdll.airpcap.AirpcapClose(hAPC)
return
beacons = [cBeaconFrame(ESSID, options.channel) for ESSID in ESSIDs]
if not options.nomap:
print('Channel: %d' % options.channel)
print('Beacons:')
for oBeaconFrame in beacons:
print(' \'%s\'' % oBeaconFrame.ESSID)
oChannel = cChannel(hAPC)
oChannel.SetChannel(options.channel)
oChannel.maximum = 13
if not options.hop:
oChannel.step = 0
oSched = sched.scheduler(time.time, time.sleep)
oSched.enter(0.1024, 1, SendBeacons, [oSched, 0.1024, hAPC, beacons, oChannel])
oSched.run()
except KeyboardInterrupt:
print('Interrupted by user')
ctypes.cdll.airpcap.AirpcapClose(hAPC)
if __name__ == '__main__':
Main()