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reassembler.py
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reassembler.py
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#!/usr/bin/env python
# vim: set ts=4 sw=4 tw=0 et pm=:
import sys
import fileinput
import getopt
import datetime
import re
import struct
import math
import os
verbose = False
ifile= None
ofile= None
mode= "undef"
options, remainder = getopt.getopt(sys.argv[1:], 'vi:o:m:', [
'verbose',
'input=',
'output=',
'mode=',
])
for opt, arg in options:
if opt in ('-v', '--verbose'):
verbose = True
elif opt in ('-i', '--input'):
ifile=arg
elif opt in ('-o', '--output'):
ofile=arg
elif opt in ('-m', '--mode'):
mode=arg
else:
raise Exception("unknown argument?")
basename=None
if ifile == None:
if not remainder:
basename="stdin"
ifile = "/dev/stdin"
else:
ifile = remainder[0]
if not basename:
basename=re.sub('\.[^.]*$','',ifile)
# basename=os.path.basename(re.sub('\.[^.]*$','',ifile))
if ofile == None:
ofile="%s.%s" % (basename, mode)
outfile=sys.stdout
elif ofile == "" or ofile == "=":
ofile="%s.%s" % (basename, mode)
outfile=open(ofile,"w")
else:
basename=re.sub('\.[^.]*$','',ofile)
outfile=open(ofile,"w")
if verbose:
print "ifile",ifile
print "ofile",ofile
print "basen",basename
def fixtime(n,t):
try:
(crap,ts,fnord)=n.split("-",3)
return (float(ts)+int(t)/1000)
except:
return int(t)/1000
class MyObject(object):
pass
class Reassemble(object):
def __init__(self):
raise Exception("undef")
stat_line=0
stat_filter=0
def run(self,producer):
for line in producer:
res=self.filter(line)
if res != None:
self.stat_filter+=1
zz=self.process(res)
if zz != None:
for mo in zz:
self.consume(mo)
self.end()
def filter(self,line):
self.stat_line+=1
try:
q=MyObject()
q.typ,q.name,q.time,q.frequency,q.confidence,q.level,q.symbols,q.uldl,q.data=line.split(None,8)
q.frequency=int(q.frequency)
q.time=int(q.time)
q.level=float(q.level)
return q
except:
print >> sys.stderr, "Couldn't parse input line: ",line,
return None
def end(self):
print "Kept %d/%d (%3.1f%%) lines"%(self.stat_filter,self.stat_line,100.0*self.stat_filter/self.stat_line)
class ReassembleIDA(Reassemble):
def __init__(self):
pass
def filter(self,line):
q=super(ReassembleIDA,self).filter(line)
if q==None: return None
if q.typ=="IDA:":
qqq=re.compile('.* CRC:OK')
if not qqq.match(q.data):
return
# 0010 0 ctr=000 000 len=02 0:0000 [06.3a] 7456/0000 CRC:OK 0000
# 0000 0 ctr=000 000 len=00 0:0000 [8a.ed.09.b2.e0.a9.e7.0b.06.78.c9.49.0d.9b.60.6f.c0.07.fc.00.00.00.00] --- 0000
p=re.compile('.* cont=(\d) (\d) ctr=(\d+) \d+ len=(\d+) 0:0000 \[([0-9a-f.]*)\]\s+..../.... CRC:OK')
m=p.match(q.data)
if(not m):
print >> sys.stderr, "Couldn't parse IDA: ",q.data
else:
q.ul= (q.uldl=='UL')
q.f1= m.group(1)
q.f2= int(m.group(2))
q.ctr= int(m.group(3),2)
q.length= int(m.group(4))
q.data= m.group(5)
q.cont=(q.f1=='1')
# print "%s %s ctr:%02d %s"%(q.time,q.frequency,q.ctr,q.data)
return q
buf=[]
stat_broken=0
stat_ok=0
stat_fragments=0
stat_dupes=0
otime=0
odata=None
ofreq=0
def process(self,m):
# rudimentary De-Dupe
if (self.otime-1)<=m.time<=(self.otime+1) and self.odata==m.data and (self.ofreq-200)<m.frequency<(self.ofreq+200):
self.stat_dupes+=1
if verbose:
print "dupe: ",m.time,"(",m.cont,m.ctr,")",m.data
return
self.otime=m.time
self.odata=m.data
self.ofreq=m.frequency
ok=False
for (idx,(freq,time,ctr,dat,cont,ul)) in enumerate(self.buf[:]):
if (freq-260)<m.frequency<(freq+260) and time[-1]<=m.time<=(time[-1]+280) and (ctr+1)%8==m.ctr and ul==m.ul:
del self.buf[idx]
dat=dat+"."+m.data
time.append(m.time)
if m.cont:
self.buf.append([m.frequency,time,m.ctr,dat,m.cont,m.ul])
else:
self.stat_ok+=1
if verbose:
print ">assembled: [%s] %s"%(",".join(["%s"%x for x in time+[m.time]]),dat)
data="".join([chr(int(x,16)) for x in dat.split(".")])
return [[data,m.time,ul,m.level]]
self.stat_fragments+=1
ok=True
break
if ok:
pass
elif m.ctr==0 and not m.cont:
if verbose:
print ">single: [%s] %s"%(m.time,m.data)
data="".join([chr(int(x,16)) for x in m.data.split(".")])
return [[data,m.time,m.ul,m.level]]
elif m.ctr==0 and m.cont: # New long packet
self.stat_fragments+=1
if verbose:
print "initial: ",m.time,"(",m.cont,m.ctr,")",m.data
self.buf.append([m.frequency,[m.time],m.ctr,m.data,m.cont,m.ul])
elif m.ctr>0:
self.stat_broken+=1
self.stat_fragments+=1
if verbose:
print "orphan: ",m.time,"(",m.cont,m.ctr,")",m.data
pass
else:
print "unknown: ",m.time,m.cont,m.ctr,m.data
# expire packets
for (idx,(freq,time,ctr,dat,cont,ul)) in enumerate(self.buf[:]):
if time[-1]+1000<=m.time:
self.stat_broken+=1
del self.buf[idx]
if verbose:
print "timeout:",time,"(",cont,ctr,")",dat
data="".join([chr(int(x,16)) for x in dat.split(".")])
#could be put into assembled if long enough to be interesting?
break
def end(self):
super(ReassembleIDA,self).end()
print "%d valid packets assembled from %d fragments (1:%1.2f)."%(self.stat_ok,self.stat_fragments,((float)(self.stat_fragments)/self.stat_ok))
print "%d/%d (%3.1f%%) broken fragments."%(self.stat_broken,self.stat_fragments,(100.0*self.stat_broken/self.stat_fragments))
print "%d dupes removed."%(self.stat_dupes)
def consume(self,q):
(data,time,ul,level)=q
if ul:
ul="UL"
else:
ul="DL"
str=""
for c in data:
if( ord(c)>=32 and ord(c)<127):
str+=c
else:
str+="."
print >>outfile, "%09d %s %s | %s"%(time,ul," ".join("%02x"%ord(x) for x in data),str)
class ReassembleIDALAP(ReassembleIDA):
first=True
outfile=None
def consume(self,q):
if self.first:
pcap_hdr=struct.pack("<LHHlLLL",0xa1b2c3d4,0x2,0x4,0x0,0,0xffff,1)
outfile.write(pcap_hdr)
self.first=False
# Filter non-GSM packets (see IDA-GSM.txt)
(data,time,ul,level)=q
if ord(data[0])&0xf==6 or ord(data[0])&0xf==8 or (ord(data[0])>>8)==7:
return
if len(data)==1:
return
lapdm=data
try:
olvl=10*math.log(level,10)
except:
olvl=0
if olvl>127:
olvl=127
if olvl<-126:
olvl=-126
if ul:
gsm=struct.pack("!BBBBHbBLBBBB",2,4,1*0+2,0,0x4000,olvl,0,0,7,0,0,0)+lapdm
else:
gsm=struct.pack("!BBBBHbBLBBBB",2,4,1*0+2,0,0x0000,olvl,0,0,7,0,0,0)+lapdm
udp=struct.pack("!HHHH",45988,4729,8+len(gsm),0xffff)+gsm
if ul:
ip=struct.pack("!BBHHBBBBHBBBBBBBB",(0x4<<4)+5,0,len(udp)+20,0xdaae,0x40,0x0,0x40,17,0xffff,10,0,0,1,127,0,0,1)+udp
else:
ip=struct.pack("!BBHHBBBBHBBBBBBBB",(0x4<<4)+5,0,len(udp)+20,0xdaae,0x40,0x0,0x40,17,0xffff,127,0,0,1,10,0,0,1)+udp
if ul:
eth=struct.pack("!BBBBBBBBBBBBH",0xaa,0xbb,0xcc,0xdd,0xee,0xff,0x10,0x22,0x33,0x44,0x55,0x66,0x800)+ip
else:
eth=struct.pack("!BBBBBBBBBBBBH",0x10,0x22,0x33,0x44,0x55,0x66,0xaa,0xbb,0xcc,0xdd,0xee,0xff,0x800)+ip
pcap=struct.pack("<IIII",time/1000,time%1000,len(eth),len(eth))+eth
outfile.write(pcap)
if verbose:
if ul:
ul="UL"
else:
ul="DL"
print "%09d %.3f %s %s"%(time,level,ul,".".join("%02x"%ord(x) for x in data))
class ReassembleIRA(Reassemble):
def __init__(self):
pass
def filter(self,line):
q=super(ReassembleIRA,self).filter(line)
if q==None: return None
if q.typ=="IRA:":
p=re.compile('.*sat:(\d+) beam:(\d+) pos=\((.[0-9.]+)/(.[0-9.]+)\) alt=([-0-9]+) .* bc_sb:\d+ (.*)')
m=p.match(q.data)
if(not m):
print >> sys.stderr, "Couldn't parse IRA: ",q.data
else:
q.sat= int(m.group(1))
q.beam= int(m.group(2))
q.posx= m.group(3)
q.posy= m.group(4)
q.alt= int(m.group(5))
p=re.compile('PAGE\(tmsi:([0-9a-f]+) msc_id:([0-9]+)\)')
q.pages=p.findall(m.group(6))
return q
def process(self,q):
for x in q.pages:
return ["%02d %02d %s %s %03d : %s %s"%(q.sat,q.beam,q.posx,q.posy,q.alt,x[0],x[1])]
def consume(self,q):
print >> outfile, q
class ReassembleMSG(Reassemble):
def __init__(self):
pass
def filter(self,line):
q=super(ReassembleMSG,self).filter(line)
if q == None: return None
if q.typ == "MSG:":
#ric:0098049 fmt:05 seq:43 1010010000 1/1 oNEZCOuxvM3PuiQHujzQYd5n0Q8ra0wfMG2WnnhoxAnunT9xzIBSkXyvNP[3] +11111
p=re.compile('.* ric:(\d+) fmt:(\d+) seq:(\d+) [01]+ (\d)/(\d) csum:([0-9a-f][0-9a-f]) msg:([0-9a-f]+)\.([01]*) ')
m=p.match(q.data)
if(not m):
print >> sys.stderr, "Couldn't parse MSG: ",q.data
else:
q.msg_ric= int(m.group(1))
q.fmt= int(m.group(2))
q.msg_seq= int(m.group(3))
q.msg_ctr= int(m.group(4))
q.msg_ctr_max= int(m.group(5))
q.msg_checksum=int(m.group(6),16)
q.msg_hex= m.group(7)
q.msg_brest= m.group(8)
q.time= fixtime(q.name,q.time)
q.msg_msgdata = ''.join(["{0:08b}".format(int(q.msg_hex[i:i+2], 16)) for i in range(0, len(q.msg_hex), 2)])
q.msg_msgdata+=q.msg_brest
# convert to 7bit thingies
m=re.compile('(\d{7})').findall(q.msg_msgdata)
q.msg_ascii=""
q.msg=[]
for (group) in m:
character = int(group, 2)
q.msg.append(character)
if(character<32 or character==127):
q.msg_ascii+="[%d]"%character
else:
q.msg_ascii+=chr(character)
if len(q.msg_msgdata)%7:
q.msg_rest=q.msg_msgdata[-(len(q.msg_msgdata)%7):]
else:
q.msg_rest=""
return q
buf={}
ricseq={}
wrapmargin=10
def process(self,m):
# msg_seq wraps around after 61, detect it, and fix it.
if m.msg_ric in self.ricseq:
if (m.msg_seq + self.wrapmargin) < self.ricseq[m.msg_ric][1]: # seq wrapped around
self.ricseq[m.msg_ric][0]+=62
if (m.msg_seq + self.wrapmargin - 62) > self.ricseq[m.msg_ric][1]: # "wrapped back" (out-of-order old message)
self.ricseq[m.msg_ric][0]-=62
else:
self.ricseq[m.msg_ric]=[0,0]
self.ricseq[m.msg_ric][1]=m.msg_seq
id="%07d %04d"%(m.msg_ric,(m.msg_seq+self.ricseq[m.msg_ric][0]))
ts=m.time
if id in self.buf:
if self.buf[id].msg_checksum != m.msg_checksum:
print "Whoa! Checksum changed? Message %s (1: @%d checksum %d/2: @%d checksum %d)"%(id,self.buf[id].time,self.buf[id].msg_checksum,m.time,m.msg_checksum)
# "Wrap around" to not miss the changed packet.
self.ricseq[m.msg_ric][0]+=62
id="%07d %04d"%(m.msg_ric,(m.msg_seq+self.ricseq[m.msg_ric][0]))
m.msgs=['[MISSING]']*3
self.buf[id]=m
else:
m.msgs=['[MISSING]']*3
self.buf[id]=m
self.buf[id].msgs[m.msg_ctr]=m.msg_ascii
def messagechecksum(self,msg):
csum=0
for x in msg:
csum=(csum+ord(x))%128
return (~csum)%128
def consume(self,q):
print "consume()"
pass
def end(self): # XXX should be rewritten to consume
for b in sorted(self.buf, key=lambda x: self.buf[x].time):
msg="".join(self.buf[b].msgs[:1+self.buf[b].msg_ctr_max])
msg=re.sub("(\[3\])+$","",msg) # XXX: should be done differently
cmsg=re.sub("\[10\]","\n",msg) # XXX: should be done differently
csum=self.messagechecksum(cmsg)
str="Message %s @%s (len:%d)"%(b,datetime.datetime.fromtimestamp(self.buf[b].time).strftime("%Y-%m-%dT%H:%M:%S"),self.buf[b].msg_ctr_max)
str+= " %3d"%self.buf[b].msg_checksum
str+= (" fail"," OK ")[self.buf[b].msg_checksum == csum]
str+= ": %s"%(msg)
print >> outfile, str
zx=None
if False:
pass
if mode == "ida":
zx=ReassembleIDA()
elif mode == "lap":
if outfile == sys.stdout: # Force file, since it's binary
ofile="%s.%s" % (basename, "pcap")
outfile=open(ofile,"w")
zx=ReassembleIDALAP()
elif mode == "page":
zx=ReassembleIRA()
elif mode == "msg":
zx=ReassembleMSG()
zx.run(fileinput.input(ifile))