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lib_workers.py
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lib_workers.py
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#! /usr/bin/python
#### LIBS ####
## CANON IMPORTS
import ctypes, multiprocessing, threading
import time, math, shutil, os
import random, importlib, inspect
## EXT IMPORTS
import winpcapy
## HOMEBREW LIBS
import conf_net as netconf
import conf_steg as stegconf
import conf_appli as appliconf
import lib_net as netlib
import lib_steg as steglib
import lib_shamir as shamirlib
import lib_packetparser as packetparser
#### VARS ####
# SCENARIO VARS
DEFAULT_STEGCONF = 'conf_steg.py'
BACKUP_STEGCONF = 'conf_steg.py.old'
DEFAULT_APPLICONF = 'conf_appli.py'
BACKUP_APPLICONF = 'conf_appli.py.old'
SCENARIO_FOLDER = 'scenarios'
STEGSCENAR_FOLDER = 'steg'
APPLISCENAR_FOLDER ='appli'
SCENARIO_NAME = None
# PCAP VARS
ERRBUF = winpcapy.create_string_buffer(winpcapy.PCAP_ERRBUF_SIZE)
DEV0 = netconf.DEVICE1
DEV1 = netconf.DEVICE2
DEV0MAC = netconf.DEV1MAC
DEV1MAC = netconf.DEV2MAC
DEV0IP = netconf.DEV1IP
DEV1IP = netconf.DEV2IP
DEV0HANDLER = winpcapy.pcap_open_live(DEV0,65536,0,1000,ERRBUF)
DEV1HANDLER = winpcapy.pcap_open_live(DEV1,65536,0,1000,ERRBUF)
# BUFFER VARS
DEV0RBUFFER = multiprocessing.Queue() # buffer entre readingspider et craftspider
DEV0MBUFFER = multiprocessing.Queue() # buffer entre craftspider et middlespider
DEV0CBUFFER = multiprocessing.Queue() # buffer entre applispider et craftspider
DEV1WBUFFER = multiprocessing.Queue() # buffer entre middlespider et writing spider
DEV1RBUFFER = multiprocessing.Queue() # buffer entre readingspider et craftspider
DEV1MBUFFER = multiprocessing.Queue() # buffer entre craftspider et middlespider
DEV1CBUFFER = multiprocessing.Queue() # buffer entre applispider et craftspider
DEV0WBUFFER = multiprocessing.Queue() # buffer entre middlespider et writing spider
DEV0ABUFFER = multiprocessing.Queue() # buffer interne application
DEV1ABUFFER = multiprocessing.Queue() # buffer interne application
# STEGOSYSTEME
STEG_ENGINE_IS_ON = stegconf.STEG_ENGINE_IS_ON
F_NIV3_STEG = stegconf.F_NIV3_STEG
F_NIV4_STEG = stegconf.F_NIV4_STEG
# APPLI
SRC_FILEPATH = appliconf.SRC_FILEPATH
DST_FILEPATH = appliconf.DST_FILEPATH
# SHAMIR
SHAMIR_ON = appliconf.SHAMIR_ON
SHAMIR_N = appliconf.SHAMIR_N
SHAMIR_K = appliconf.SHAMIR_K
SHAMIR_GFIELD = appliconf.SHAMIR_GFIELD
SHAMIR_MLR = appliconf.SHAMIR_MAX_LETTER_REF
O_ABSCISSE_SIZE = int(math.log(SHAMIR_N,2))+1
O_ORDONNEE_SIZE = 7 # Y modulo is SHAMIR_GFIELD, hence 67, hence 7 bits # should automatise calculus
# MSEQUENCE
MSEQUENCE_ON = appliconf.MSEQUENCE_ON
MS_KEY_PERIOD = appliconf.MS_KEY_PERIOD
MS_TAPS = appliconf.MS_TAPS
# PROTOCOL
FLAG_STRING = appliconf.FLAG_STRING
FLAG_METHOD = appliconf.FLAG_METHOD
FLAG_FREQ = appliconf.FLAG_FREQ
REF_LETTER = appliconf.REF_LETTER
O_HEADER_SIZE = REF_LETTER+1
# FILTERS
F_NIV3 = stegconf.F_NIV3
PROTO3 = stegconf.PROTO3
F_NIV3_SRC = stegconf.F_NIV3_SRC
F_NIV3_DST = stegconf.F_NIV3_DST
F_NIV4 = stegconf.F_NIV4
PROTO4 = stegconf.PROTO4
#### FX ####
## PCAP FX
def close_handlers():
winpcapy.pcap_close(DEV0HANDLER)
winpcapy.pcap_close(DEV1HANDLER)
def restart_handlers():
global DEV0HANDLER, DEV1HANDLER
DEV0HANDLER = winpcapy.pcap_open_live(DEV0,65536,0,1000,ERRBUF)
DEV1HANDLER = winpcapy.pcap_open_live(DEV1,65536,0,1000,ERRBUF)
def close_queues():
DEV0RBUFFER.close()
DEV0MBUFFER.close()
DEV0CBUFFER.close()
DEV1WBUFFER.close()
DEV1RBUFFER.close()
DEV1MBUFFER.close()
DEV1CBUFFER.close()
DEV0WBUFFER.close()
DEV0ABUFFER.close()
DEV1ABUFFER.close()
def restart_queues():
close_queues()
DEV0RBUFFER = multiprocessing.Queue()
DEV0MBUFFER = multiprocessing.Queue()
DEV0CBUFFER = multiprocessing.Queue()
DEV1WBUFFER = multiprocessing.Queue()
DEV1RBUFFER = multiprocessing.Queue()
DEV1MBUFFER = multiprocessing.Queue()
DEV1CBUFFER = multiprocessing.Queue()
DEV0WBUFFER = multiprocessing.Queue()
DEV0ABUFFER = multiprocessing.Queue()
DEV1ABUFFER = multiprocessing.Queue()
## SCENARIOS FX
def loadConf():
global STEG_ENGINE_IS_ON, F_NIV3_STEG, F_NIV4_STEG
global SRC_FILEPATH, DST_FILEPATH
global SHAMIR_N, SHAMIR_K, SHAMIR_GFIELD, SHAMIR_MLR, O_ABSCISSE_SIZE, O_ORDONNEE_SIZE
global MS_KEY_PERIOD, MS_TAPS
global FLAG_STRING, FLAG_METHOD, FLAG_FREQ, REF_LETTER, O_HEADER_SIZE
global F_NIV3, PROTO3, F_NIV3_SRC, F_NIV3_DST
global F_NIV4, PROTO4
# STEGOSYSTEME
STEG_ENGINE_IS_ON = stegconf.STEG_ENGINE_IS_ON
F_NIV3_STEG = stegconf.F_NIV3_STEG
F_NIV4_STEG = stegconf.F_NIV4_STEG
# APPLI
SRC_FILEPATH = appliconf.SRC_FILEPATH
DST_FILEPATH = appliconf.DST_FILEPATH
# SHAMIR
SHAMIR_ON = appliconf.SHAMIR_ON
SHAMIR_N = appliconf.SHAMIR_N
SHAMIR_K = appliconf.SHAMIR_K
SHAMIR_GFIELD = appliconf.SHAMIR_GFIELD
SHAMIR_MLR = appliconf.SHAMIR_MAX_LETTER_REF
O_ABSCISSE_SIZE = int(math.log(SHAMIR_N,2))+1
O_ORDONNEE_SIZE = 7 # Y modulo is SHAMIR_GFIELD, hence 67, hence 7 bits # should automatise calculus
# MSEQUENCE
MSEQUENCE_ON = appliconf.MSEQUENCE_ON
MS_KEY_PERIOD = appliconf.MS_KEY_PERIOD
MS_TAPS = appliconf.MS_TAPS
# PROTOCOL
FLAG_STRING = appliconf.FLAG_STRING
FLAG_METHOD = appliconf.FLAG_METHOD
FLAG_FREQ = appliconf.FLAG_FREQ
REF_LETTER = appliconf.REF_LETTER
O_HEADER_SIZE = REF_LETTER+1
# FILTERS
F_NIV3 = stegconf.F_NIV3
PROTO3 = stegconf.PROTO3
F_NIV3_SRC = stegconf.F_NIV3_SRC
F_NIV3_DST = stegconf.F_NIV3_DST
F_NIV4 = stegconf.F_NIV4
PROTO4 = stegconf.PROTO4
def changeScenar(scenario_name):
global SCENARIO_NAME
fsrc = os.path.join(os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))),DEFAULT_STEGCONF)
fdst = os.path.join(os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))),BACKUP_STEGCONF)
shutil.copy(fsrc,fdst)
fsrc = os.path.join(os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))),SCENARIO_FOLDER,STEGSCENAR_FOLDER,str(scenario_name)+".py")
fdst = os.path.join(os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))),DEFAULT_STEGCONF)
shutil.copy(fsrc,fdst)
fsrc = os.path.join(os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))),DEFAULT_APPLICONF)
fdst = os.path.join(os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))),BACKUP_APPLICONF)
shutil.copy(fsrc,fdst)
fsrc = os.path.join(os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))),SCENARIO_FOLDER,APPLISCENAR_FOLDER,str(scenario_name)+".py")
fdst = os.path.join(os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))),DEFAULT_APPLICONF)
shutil.copy(fsrc,fdst)
SCENARIO_NAME = scenario_name
def checkScenar(scenario_name):
#steg_description = importlib.import_module(os.path.join(SCENARIO_FOLDER,STEGSCENAR_FOLDER,str(scenario_name))).DESCRIPTION
steg_description = importlib.import_module(str(SCENARIO_FOLDER)+"."+str(STEGSCENAR_FOLDER)+"."+str(scenario_name)).DESCRIPTION
#appli_description = importlib.import_module(os.path.join(SCENARIO_FOLDER,APPLISCENAR_FOLDER,str(scenario_name))).DESCRIPTION
appli_description = importlib.import_module(str(SCENARIO_FOLDER)+"."+str(APPLISCENAR_FOLDER)+"."+str(scenario_name)).DESCRIPTION
return steg_description+'\n'+appli_description
#### WORKERS ####
## NET WORKERS ##
# NET PROBE
class ProbeSpider(multiprocessing.Process):
def __init__(self,num,verbose=False):
multiprocessing.Process.__init__(self)
self.wtype = "engine"
self.verbose = verbose
self.is_running = True
self.num = num
if self.verbose:
print "ProbeSpider starting"
def run(self):
if self.num == 0:
handler = DEV0HANDLER
elif self.num == 1:
handler = DEV1HANDLER
while self.is_running:
hdr = ctypes.POINTER(winpcapy.pcap_pkthdr)()
pkt = ctypes.POINTER(ctypes.c_ubyte)()
res = winpcapy.pcap_next_ex(handler,ctypes.byref(hdr),ctypes.byref(pkt))
if res>0:
print "PROBE : packet found (len : "+str(hdr.contents.len)+")"
if self.verbose:
data = ctypes.string_at(pkt,hdr.contents.len)
print "PROBE : packet content : "+str(data)+"\n"
if self.verbose:
print "ProbeSpider stoped"
return
# NET WORKER (IN)
class ReadingSpider(multiprocessing.Process):
def __init__(self,num):
multiprocessing.Process.__init__(self)
self.wtype = "engine"
self.num = num
self.otbuffer = 0
self.inMac = 0
self.is_running = True
self.handler = 0
self.x = 0 # remplacer par complement a 1 du chiffre ? (i.e. c'est l'inverse binaire de num a priori)
if num == 0:
self.otbuffer = DEV0RBUFFER
self.inMac = DEV0MAC
self.x = 1
elif num == 1:
self.otbuffer = DEV1RBUFFER
self.inMac = DEV1MAC
def run(self):
handler = 0
if self.num == 0:
handler = DEV0HANDLER
elif self.num == 1:
handler = DEV1HANDLER
while self.is_running:
hdr = ctypes.POINTER(winpcapy.pcap_pkthdr)()
pkt = ctypes.POINTER(ctypes.c_ubyte)()
res = winpcapy.pcap_next_ex(handler,ctypes.byref(hdr),ctypes.byref(pkt))
if res>0 :
data = ctypes.string_at(pkt,hdr.contents.len)
if netlib.read_mac_hdr(data)[self.x] == self.inMac: # nota bene : limite effet passerelle
self.otbuffer.put(data)
return
# NET WORKER (OUT)
class WritingSpider(multiprocessing.Process):
def __init__(self,num):
multiprocessing.Process.__init__(self)
self.wtype = "engine"
self.num = num
self.inbuffer = 0
self.is_running = True
self.handler = 0
if self.num == 0:
self.inbuffer = DEV1WBUFFER
elif self.num == 1:
self.inbuffer = DEV0WBUFFER
def run(self):
handler = 0
if self.num == 0:
handler = DEV1HANDLER
elif self.num == 1:
handler = DEV0HANDLER
while self.is_running:
for data in iter(self.inbuffer.get, None):
data = netlib.format_packet(data)
winpcapy.pcap_sendpacket(handler,data,len(data))
return
# NET WORKER (MID)
class MiddleSpider(multiprocessing.Process):
def __init__(self,num):
multiprocessing.Process.__init__(self)
self.wtype = "engine"
self.num = num
self.inbuffer = 0
self.otbuffer = 0
self.inMac = 0
self.inIp = 0
self.outMac = 0
self.outIp = 0
self.is_running = True
self.type3 = 0
if self.num == 0:
self.inbuffer = DEV0MBUFFER
self.otbuffer = DEV1WBUFFER
self.inMac = DEV0MAC
self.inIp = DEV0IP
self.outMac = DEV1MAC
self.outIp = DEV1IP
elif self.num == 1:
self.inbuffer = DEV1MBUFFER
self.otbuffer = DEV0WBUFFER
self.inMac = DEV1MAC
self.inIp = DEV1IP
self.outMac = DEV0MAC
self.outIp = DEV0IP
def run(self):
while self.is_running:
for data in iter(self.inbuffer.get, None):
# translation d'adresses niveau 2
if self.num == 0:
data = data[:6]+netlib.format_mac(self.outMac)+data[12:] # switch MAC
elif self.num == 1:
data = netlib.format_mac(self.outMac)+data[6:] # switch MAC
# translation d'adresses niveau 3 + calcul de checksums
self.type3 = netlib.get_type3(data[12:14])
if self.type3 == "0806": # si ARP
data = netlib.arp_rewriting(data,self.outMac,self.outIp,self.num)
# optimisation : si preformat lors de init, moins de taff dans netlib
elif self.type3 == "0800": # si IPv4
ipsrc = data[26:30]
ipdst = data[30:34]
# optimisation : passer le format_ip dans l'init
if self.num == 0:
if ipsrc == netlib.format_ip(self.inIp):
ipsrc = netlib.format_ip(self.outIp)
elif self.num == 1:
if ipdst == netlib.format_ip(self.inIp):
ipdst = netlib.format_ip(self.outIp)
data = netlib.ip_rewriting(data,ipsrc,ipdst) # nat + checksum
if netlib.udp_or_tcp(data[23]): # si udp ou tcp
data = netlib.tcpudp_rewriting(data) # checksum niveau4
self.otbuffer.put(data)
return
## CRAFT WORKERS ##
# NOVICE SPIDER
# No craft functions, no craft buffer
class NoviceSpider(multiprocessing.Process):
def __init__(self,num):
multiprocessing.Process.__init__(self)
self.wtype = "craft"
self.num = num
self.is_running = True
self.inbuffer = 0
self.otbuffer = 0
if self.num == 0:
self.inbuffer = DEV0RBUFFER
self.otbuffer = DEV0MBUFFER
elif self.num == 1:
self.inbuffer = DEV1RBUFFER
self.otbuffer = DEV1MBUFFER
def run(self):
while self.is_running:
for data in iter(self.inbuffer.get, None):
self.otbuffer.put(data)
return
# STEG WORKER
class StegSpider(multiprocessing.Process):
def check_steg(self,data):
doin = True
if not STEG_ENGINE_IS_ON:
doin = False
# LEVEL 3 : PROTOCOL FILTER
if F_NIV3 != "":
if self.type3 != PROTO3:
doin = False
# LEVEL 3 : DESTINATION ADDRESS FILTER
if F_NIV3_DST != "":
if self.type3 == "0800":
if not (steglib.check_ip(data[30:34],netlib.format_ip(F_NIV3_DST))): # ipv6 : 0x86dd, data[38:54]
doin = False
else:
doin = False
# LEVEL 3 : SOURCE ADDRESS FILTER
if F_NIV3_SRC != "":
if self.type3 == "0800":
if not (steglib.check_ip(data[26:30],netlib.format_ip(F_NIV3_SRC))): # ipv6 : 0x86dd, data[22:38]
doin = False
else:
doin = False
# LEVEL 4 : PROTOCOL FILTER
if F_NIV4 != "":
if self.type4 != PROTO4:
doin = False
return doin
# MAIN
def __init__(self,num):
multiprocessing.Process.__init__(self)
self.wtype = "craft"
self.num = num
self.inbuffer = 0
self.craftbuffer = 0
self.otbuffer = 0
self.is_running = True
self.type3 = ""
self.type4 = ""
if self.num == 0:
self.inbuffer = DEV0RBUFFER
self.craftbuffer = DEV0CBUFFER
self.otbuffer = DEV0MBUFFER
elif self.num == 1:
self.inbuffer = DEV1RBUFFER
self.craftbuffer = DEV1CBUFFER
self.otbuffer = DEV1MBUFFER
def run(self):
while self.is_running:
for data in iter(self.inbuffer.get, None):
# recognising protocols
self.type3 = netlib.get_type3(data[12:14])
if self.type3 == "0800": # what about ipv6 ? what about other protocols ?
try:
self.type4 = netlib.get_type4(data[23]) # get type4 for ipv4 VS get type4 for ipv6 ?
except Exception:
self.type4 = ""
pass
# doin' stegano ? filtering step
if self.check_steg(data) : # a optimiser en envoyant que les datas necessaires
# BINPACK
data = steglib.binpack(data)
# UNPAQUET
paquet = [] # will contain list of dicts(name, position, size, workable, value)
# unpacket level 2
header,data = packetparser.unPaquet(data,"Ethernet") # quid not Ethernet ?
paquet += [header]
# unpacket level 3
try:
header,data = packetparser.unPaquet(data,{v: k for k,v in stegconf.NIV3_DICT.items()}[self.type3])
paquet += [header]
except Exception as e:
print "ACHTUNG ! unPaquet level 3 for "+str(self.type3)+": "+str(e)
pass
# unpacket level 4
if self.type4 != "":
try:
header, data = packetparser.unPaquet(data,{v: k for k,v in stegconf.NIV4_DICT.items()}[self.type4])
paquet += [header]
except Exception as e:
print "ACHTUNG ! unPaquet level 4 for "+str(self.type4)+": "+str(e)
pass
# GET WORKABLE BITS
tab = [] # will contain ''.join(getWorkableBits(header)), a str(list of workable bits)
if F_NIV3_STEG and len(paquet)>1:
tab += [''.join(steglib.getWorkableBits(paquet[1]))] # manipulera un header
if F_NIV4_STEG and len(paquet)>2:
tab += [''.join(steglib.getWorkableBits(paquet[2]))] # manipulera un header
totalen = sum([len(t) for t in tab])
# INSERTION / EXTRACTION
if totalen>6: # enough space for protocol and data ?
if self.num == 0 : # insertion
print "INSERTION START"
# maxsize according to protocol, max 31 (3*8+7) bits plus 6 (2+3+1) bits of protocol
localbuff = list()
# data waiting to be steganographied
newlen = min(totalen,31+6)
if not self.craftbuffer.empty():
while (len(localbuff)<(newlen-6) and not (self.craftbuffer.empty())):
localbuff.append(self.craftbuffer.get())
S = int(len(localbuff)/8.0)
O = len(localbuff) - S*8
temptab = ''.join(tab)
while len(localbuff)<(totalen-6):
localbuff.append(str(temptab[len(localbuff)])) # too slow ?
localbuff = list(bin(S)[2:].zfill(2))+list(bin(O)[2:].zfill(3))+localbuff # len+5
localbuff.append(str(steglib.xor_complement1(map(int, localbuff)))) # ajout du flag
# localbuff a ete charge au maximum disponible, size, offset, padding et flag inclus
else: # no data waiting
localbuff = list(''.join(tab)[:-1])
localbuff.insert(random.randint(0,len(localbuff)),str(int(not(steglib.xor_complement1(map(int,localbuff)))))) # insertion du flag
# SET WORKABLE BITS
if F_NIV3_STEG and len(paquet)>1: # implies len(tab)>0
paquet[1] = steglib.setWorkableBits(paquet[1],localbuff[:len(tab[0])])
if F_NIV4_STEG and len(paquet)>2: # implies len(tab)>1
paquet[2] = steglib.setWorkableBits(paquet[2],localbuff[len(tab[0]):len(tab[0])+len(tab[1])])
elif self.num == 1 : # extraction
print "EXTRACTION START"
if steglib.xor_check(map(int,list(''.join(tab)))): # flag check
localbuff = list(''.join(tab)[:-1])
dsize = (int(''.join(localbuff[:2]),2)*8)+int(''.join(localbuff[2:5]),2) # S+O (number of bytes+offset)
localbuff = localbuff[5:dsize+5]
while len(localbuff)>0:
self.craftbuffer.put(localbuff.pop(0))
# REPAQUET
bindata = packetparser.repaquet(paquet,data)
# BINUNPACK
data = steglib.binunpack(bindata)
#print "HANDING THE PACKET OVER"
self.otbuffer.put(data)
return
## APPLI WORKERS ##
class SpamSpider(multiprocessing.Process):
def __init__(self,k):
multiprocessing.Process.__init__(self)
self.wtype = "application"
self.is_running = True
self.k = k
self.t = 0
self.otbuffer = DEV0CBUFFER
def run(self):
while (self.is_running and self.t<self.k):
self.otbuffer.put(str(random.randint(0,1)))
self.t += 1
return
class FileSpider(multiprocessing.Process):
# /!\ WARNING : APPLICATION-LEVEL FLAG SYSTEM NOT IMPLEMENTED YET /!\
def __init__(self,num,filename):
multiprocessing.Process.__init__(self)
self.wtype = "application"
self.is_running = True
self.num = num
self.filename = filename
# if SHAMIR_ON ?
self.shamirsize = (SHAMIR_MLR-1).bit_length()+(SHAMIR_N-1).bit_length()+(SHAMIR_GFIELD-1).bit_length()
self.shamirbuffer = []
self.shamir_rtable = {k:{} for k in range(SHAMIR_MLR)}
self.shamir_lastref = 0
self.shamirmessage = []
self.shamir_tvalue = SHAMIR_GFIELD
self.shamir_endingchar = shamirlib.BASE64_REVERSE['MESSAGE_ENDING_CHAR']
self.shamir_defaultval = 0
if self.num == 0:
self.craftbuffer = DEV0CBUFFER
elif self.num == 1:
self.craftbuffer = DEV1CBUFFER
def run(self):
while self.is_running:
if self.num == 0: # emission
filepath = os.path.join(os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))),"files",SRC_FILEPATH,self.filename)
with open(filepath) as f:
data = f.read()
f.close()
bdata = list()
if SHAMIR_ON:
bdata = shamirlib.send_message(data,SHAMIR_K,SHAMIR_N,SHAMIR_MAX_LETTER_REF,SHAMIR_GFIELD)
else:
bdata = [list(bin(ord(t))[2:].zfill(8)) for t in data]
for x in data:
for y in x:
self.craftbuffer.put(y)
if self.num == 1: # reception
filepath = os.path.join(os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))),"files",DST_FILEPATH,self.filename)
newdata = ""
if SHAMIR_ON:
if len(self.shamirbuffer) == self.shamirsize: # if enough bits for a shamir message
re = shamirlib.receive_element(map(str,self.shamirbuffer),SHAMIR_MLR,SHAMIR_N) # extract letter_ref, x and y from data
self.shamir_rtable[re[0]][re[1]] = re[2] # assigning value y to point x for letter letter_ref
if re[0] == self.shamir_lastref: # still the same letter
if len(self.shamir_rtable[re[0]])>SHAMIR_K: # do we have enough to try to reconstruct the original data ?
temp = shamirlib.reconstruction(rtable[re[0]])
tvalue = shamirlib.modulo_fractions(temp[0],temp[1],SHAMIR_GFIELD)
if tvalue == self.shamir_endingchar: # this is the end, my only friend, the end
msg = [x for x in self.shamirmessage if x != self.shamir_endingchar] # there should be no endingchar in shamirmessage, paranoid much ?
if len(msg)>0:
newdata = shamirlib.post_receiving_routine(msg,SHAMIR_GFIELD,self.shamir_defaultval)
# re-init (optimisation ?)
self.shamirbuffer = []
self.shamir_rtable = {k:{} for k in range(SHAMIR_MLR)}
self.shamir_lastref = 0
self.shamirmessage = []
self.shamir_tvalue = SHAMIR_GFIELD
else:
if tvalue != self.shamir_tvalue:
self.shamir_tvalue = tvalue # think of a better correction algorithm using previous values/K in N combinations
else: # oh my, we are looking at a new letter !
self.shamirmessage += [self.shamir_tvalue] # we add the reconstructed value to the message
self.shamir_rtable[self.shamir_lastref] = {}
self.shamir_tvalue = SHAMIR_GFIELD
self.shamir_lastref = re[0]
self.shamirbuffer = [] # empty the buffer after using the shamirsize bits
else: # get bits from craftbuffer to shamirbuffer
if not self.craftbuffer.empty():
self.shamirbuffer.append(self.craftbuffer.get())
else:
while not self.craftbuffer.empty():
tdata = ""
tdata += str(self.craftbuffer.get())
tdata = tdata+'0'*(8-(len(newdata)%8))
for k in range(len(tdata)/8):
newdata += chr(int(tdata[k*8:(k+1)*8],2))
with open(filepath,'w') as f:
f.write(newdata)
f.close()
return
# Multiple raw_input + multiprocessing conflict. To be rewritten.
class ShamirChatSpider(multiprocessing.Process):
# /!\ WARNING : APPLICATION-LEVEL FLAG SYSTEM NOT IMPLEMENTED YET /!\
def __init__(self,num):
multiprocessing.Process.__init__(self)
self.wtype = "application"
self.is_running = True
self.num = num
# if SHAMIR_ON ?
self.shamirsize = (SHAMIR_MLR-1).bit_length()+(SHAMIR_N-1).bit_length()+(SHAMIR_GFIELD-1).bit_length()
self.shamirbuffer = []
self.shamir_rtable = {k:{} for k in range(SHAMIR_MLR)}
self.shamir_lastref = 0
self.shamirmessage = []
self.shamir_tvalue = SHAMIR_GFIELD
self.shamir_endingchar = shamirlib.BASE64_REVERSE['MESSAGE_ENDING_CHAR']
self.shamir_defaultval = 0
if self.num == 0:
self.craftbuffer = DEV0CBUFFER
elif self.num == 1:
self.craftbuffer = DEV1CBUFFER
def run(self):
while self.is_running:
if self.num == 0: # emission
data = str(raw_input("\n(chat) > ")) # sanitize function needed
# will enter in conflict with ANANSI raw_input ?
if data == "EXIT":
self.is_running = False
print "\n(chat) > BYE"
else:
data = shamirlib.send_message(data,
SHAMIR_K,
SHAMIR_N,
SHAMIR_MLR,
SHAMIR_GFIELD)
for x in data:
for y in x:
self.craftbuffer.put(y)
if self.num == 1: # reception
if len(self.shamirbuffer) == self.shamirsize: # if enough bits for a shamir message
re = shamirlib.receive_element(map(str,self.shamirbuffer),SHAMIR_MLR,SHAMIR_N) # extract letter_ref, x and y from data
self.shamir_rtable[re[0]][re[1]] = re[2] # assigning value y to point x for letter letter_ref
if re[0] == self.shamir_lastref: # still the same letter
if len(self.shamir_rtable[re[0]])>SHAMIR_K: # do we have enough to try to reconstruct the original data ?
temp = shamirlib.reconstruction(rtable[re[0]])
tvalue = shamirlib.modulo_fractions(temp[0],temp[1],SHAMIR_GFIELD)
if tvalue == self.shamir_endingchar: # this is the end, my only friend, the end
msg = [x for x in self.shamirmessage if x != self.shamir_endingchar] # there should be no endingchar in shamirmessage, paranoid much ?
if len(msg)>0:
print "\nMSG : "+shamirlib.post_receiving_routine(msg,SHAMIR_GFIELD,self.shamir_defaultval)
# re-init (optimisation ?)
self.shamirbuffer = []
self.shamir_rtable = {k:{} for k in range(SHAMIR_MLR)}
self.shamir_lastref = 0
self.shamirmessage = []
self.shamir_tvalue = SHAMIR_GFIELD
else:
if tvalue != self.shamir_tvalue:
self.shamir_tvalue = tvalue # think of a better correction algorithm using previous values/K in N combinations
else: # oh my, we are looking at a new letter !
self.shamirmessage += [self.shamir_tvalue] # we add the reconstructed value to the message
self.shamir_rtable[self.shamir_lastref] = {}
self.shamir_tvalue = SHAMIR_GFIELD
self.shamir_lastref = re[0]
self.shamirbuffer = [] # empty the buffer after using the shamirsize bits
else: # get bits from craftbuffer to shamirbuffer
if not self.craftbuffer.empty():
self.shamirbuffer.append(self.craftbuffer.get())
return