ether2any/tunnel/rfc1149/rfc1149.py

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#!/usr/bin/python
# -*- coding: utf-8 -*-
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#
# Copyright (C) 2011 Sebastian Lohff <seba@seba-geek.de>
# Licensed under GPL v3 or later
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import pyudev
import subprocess
import scapy
from scapy.all import IP
import sys
import tempfile
import threading
from zlib import crc32
from conf import Conf
sys.path.append("../../../")
from ether2any import Ether2Any
class UdevReader(threading.Thread):
def __init__(self, dev):
threading.Thread.__init__(self)
self.daemon = True
self.context = pyudev.Context()
self.dev = dev
self.mountpoint = Conf.get("mountpoint")
self.attrs = Conf.get("udevAttrs")
def isUsableDevice(self, device):
for k, v in self.attrs.items():
try:
if not device[k] == v:
print device[k]
return False
except KeyError:
return False
return True
def readPacket(self):
print " ** Decoding packet"
p = subprocess.Popen("find %s -iname '*jpg' -printf '%%C@ %%p\n'|sort -n|tail -n 1|awk {'print $2'}" % (self.mountpoint,), shell=True, stdout=subprocess.PIPE)
if p.wait() != 0:
return False
imgName = p.stdout.read().strip()
if imgName == "":
print " !! Error: No suitable image found"
return False
print " ++ Using image %s" % imgName
print " ++ Attempting convert + tesseract decoding"
imgFile, txtFile = tempfile.mktemp(suffix=".tif"), tempfile.mktemp()
p = subprocess.Popen("convert %(input)s -colorspace Gray -white-threshold 45%% %(tmpImg)s ; tesseract %(tmpImg)s %(output)s nobatch tessconf/hex" % {'input': imgName, 'tmpImg': imgFile, 'output': txtFile}, shell=True)
if p.wait() != 0:
print " !! Error executing convert/tesseract command"
return False
output = None
try:
outFile = open(txtFile + ".txt", "r")
output = outFile.read()
outFile.close()
except IOError:
print " !! Could not open tesseract output file"
return False
output = output.replace("\n", "").replace(" ", "")
if len(output) % 2 != 0:
print " !! Output of tesseract is not byte aligned"
return False
if len(output) < 10:
print " !! Output of tesseract is not long enough"
return False
packet = "".join(map(lambda x: chr(int(output[x:x+2], 16)), xrange(0, len(output[0:-8]), 2)))
checksum = int(output[-8:], 16)
calcedChecksum = crc32(packet) & 0xffffffff
if checksum != calcedChecksum:
print " !! Checksum failed (was 0x%08x, should be 0x%08x)" % (checksum, calcedChecksum)
return False
self.dev.write(packet)
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return True
def run(self):
monitor = pyudev.Monitor.from_netlink(self.context)
monitor.filter_by(subsystem='block')
for action, device in monitor:
if self.isUsableDevice(device):
self.devname = device['DEVNAME']
if action == 'add':
print ["/bin/mount", self.devname, self.mountpoint]
p = subprocess.Popen(["/bin/mount", self.devname, self.mountpoint])
ret = p.wait()
if ret == 0:
print " ++ Mounted camera/card (%s) at %s" % (self.devname, self.mountpoint)
if self.readPacket():
print " >> Successfully read packet"
else:
print " !! Error reading packet"
print " ** Releasing camera/card (%s)..." % (self.devname,)
subprocess.Popen(["/bin/umount", "-f", self.devname])
subprocess.Popen("/bin/sync")
print " ** Unmounted"
else:
print " !! Error mounting stick (%s) at %s: Error id %d" % (self.devname, self.mountpoint, ret)
elif action == 'remove':
print " -- Camera/card (%s) removed." % self.devname
class RFC1149(Ether2Any):
def __init__(self):
Ether2Any.__init__(self, tap=False)
network = Conf.get("network", {'mtu': 1500})
self.dev.ifconfig(**network)
self.dev.up()
self.reader = UdevReader(self.dev)
self.reader.start()
def toPrinter(self, packet):
packet = packet.upper()
print packet
def sendToNet(self, packet):
print "packet", repr(packet)
scp = IP(packet)
checksum = crc32(packet) & 0xffffffff
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checksumStr = "%08x" % checksum
hexRepr = " ".join(map(lambda x: "%02x" % ord(x), packet[4:])) + " " + " ".join(map(lambda x: checksumStr[x:x+2], range(0, len(checksumStr), 2)))
print " ?>", scp.summary(), " -- hex len", len(hexRepr), "checksum 0x%08x" % checksum
i = ""
while i.lower() not in ("a", "d"):
i = raw_input(" ?? (A)ccept/(D)rop? ")
if i == "a":
# accept the packet!
print " >> Moved one packet to printer"
self.toPrinter(hexRepr)
self.reader.output(hexRepr.replace(" ", ""))
else:
print " -- Dropped"
if __name__ == '__main__':
rfc1149 = RFC1149()
rfc1149.run()