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frames.py
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#! /usr/bin/python
# -*- coding: utf-8 -*-
"""
Copyright (C) 2013 Anders Nylund
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
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/>.
"""
from __future__ import print_function
import time
import random
from random import SystemRandom
START = b'\x02'
END = b'\x04'
STATUS_CODES = (0,1,2,3)
FUNCTION_CODES = (0,1,2,3,4,5,6,7,8,9,10,11)
class Request_frame(object):
def __init__(self):
self.REQUEST_HEADER_SIZE = 52
self.appid = ''.join([random.choice('abcdefghijk') for a in range(10)])
self.controllerid = ''.join([random.choice('abcdefghijk') for a in range(10)])
self.encrypted = False
self.sequencenumber = 1
self.pincode = '0123456789'
self.payload = ''
self.payloadsize = len(self.payload)
self.function = 0
def encode(self):
while True:
success = True
self.framedata = ('%12s'%self.appid[:12]).encode('ascii')
self.framedata += ('%06d'%int(self.controllerid[:6])).encode('ascii')
if self.encrypted:
if hasattr(self, 'xtea_key'):
#print ('xtea encrypt 1')
self.framedata += ('%1s'%'-').encode('ascii')
else:
self.framedata += ('%1s'%'*').encode('ascii')
else:
self.framedata += ('%1s'%' ').encode('ascii')
h = START;
if self.function not in FUNCTION_CODES:
raise IOError
h += ('%02u'%self.function).encode('ascii')
h += ('%02d'%self.sequencenumber).encode('ascii')
if self.encrypted:
h += ('%10s'%self.pincode[:10]).encode('ascii')
else:
h += '0000000000'.encode('ascii')
h += ('%10s'%int(time.time())).encode('ascii')
h += ('%4s'%'pad ').encode('ascii')
h += ('%03u'%len(self.payload)).encode('ascii')
if len(self.payload) > 495:
raise IOError
try:
h += self.payload.encode('ascii')
except UnicodeError:
h += self.payload
h += END;
if self.encrypted:
pad = b''.join([bytes(chr(SystemRandom().randrange(128)), 'utf-8') for x in range(64-len(h))])
h+=pad
if hasattr(self, 'xtea_key'):
#print ('xtea encrypt 2')
h = self.xtea_key.encrypt(h)
else:
h = self.public_key.encrypt(h, None)[0]
if len(h) != 64:
success = False
self.framedata += h
if success:
return self.framedata
print ('ERROR chipertext wrong length', len(h))
def decode(self, record):
i = 0
self.appid = record[i:12]
i+=12
self.controllerid = record[i:6]
i+=6
self.encryption = record[i:1]
i+=1
if not record[i] == START[0]:
raise IOError
if len(record) < 17:
raise IOError
i += 1
self.function = int(record[i:i+2])
i += 2
self.sequencenumber = int(record[i:i+2])
i += 2
self.pincode = record[i:i+10].decode('ascii')
i += 10
self.timestamp = int(record[i:i+10].decode('ascii'))
i += 10
self.extra = record[i:i+4].decode('ascii')
i += 4
self.payloadsize = int(record[i:i+3])
i += 3
if len(record) < self.payloadsize + self.REQUEST_HEADER_SIZE:
raise IOError
self.payload = record[i:i+self.payloadsize]
i += self.payloadsize
if not record[i] == END[0]:
raise IOError
class Response_frame(object):
def __init__(self, request):
self.RESPONSE_HEADER_SIZE = 28
self.request = request
def encode(self):
self.framedata = ('%12s'%self.request.appid).encode('ascii')
self.framedata += ('%6s'%self.request.controllerid).encode('ascii')
self.framedata += START;
if int(self.function) > 13:
raise IOError
self.framedata += ('%02u'%self.function).encode('ascii')
if self.status not in STATUS_CODES:
raise IOError
self.framedata += ('%2d'%self.request.sequencenumber).encode('ascii')
self.framedata += ('%1s'%self.status).encode('ascii')
if len(self.payload) > 1007:
raise IOError
self.framedata += ('%03u'%len(self.payload)).encode('ascii')
self.framedata += self.payload.encode('ascii')
self.framedata += END;
return self.framedata
def decode(self, record):
self.framedata = record
i = 0
self.appid = record[i:i+12]
i+=12
self.controllerid = record[i:i+6]
i+=6
#import pdb;pdb.set_trace()i
if not record[i] == START[0]:
raise IOError
if len(record) < self.RESPONSE_HEADER_SIZE:
raise IOError
i += 1
self.function = int(record[i:i+2])
i += 2
self.sequencenumber = int(record[i:i+2])
if self.sequencenumber != self.request.sequencenumber:
#print self.sequencenumber, self.request.sequencenumber
raise IOError
i += 2
self.status = int(record[i:i+1])
i += 1
self.size = int(record[i:i+3])
i += 3
if not len(record) == self.size + self.RESPONSE_HEADER_SIZE:
raise IOError
#print record[i:i+self.size]
self.payload = (record[i:i+self.size]).decode('ascii')
#print self.payload
i += self.size
if not record[i] == END[0]:
raise IOError
def parse_payload(self):
frame = self.payload
d = {}
for item in frame.split(';'):
name, value = item.split('=')
d[name] = value
return d