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iridium-parser.py
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iridium-parser.py
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#!/usr/bin/env python
# vim: set ts=4 sw=4 tw=0 et pm=:
import sys
import re
import struct
from bch import ndivide, nrepair, bch_repair
from crc import crc24
import rs
import rs6
import fileinput
import getopt
import types
import copy
import datetime
from itertools import izip
from math import sqrt,atan2,pi
options, remainder = getopt.getopt(sys.argv[1:], 'vgi:o:ps', [
'verbose',
'good',
'confidence=',
'input=',
'output=',
'perfect',
'satclass',
'plot=',
'filter=',
'voice-dump=',
'format=',
])
iridium_access="001100000011000011110011" # Actually 0x789h in BPSK
uplink_access= "110011000011110011111100" # BPSK: 0xc4b
iridium_lead_out="100101111010110110110011001111"
header_messaging="00110011111100110011001111110011" # 0x9669 in BPSK
messaging_bch_poly=1897
ringalert_bch_poly=1207
acch_bch_poly=3545 # 1207 also works?
hdr_poly=29
verbose = False
perfect = False
good = False
dosatclass = False
input= "raw"
output= "line"
ofmt= None
linefilter=[]
plotargs=["time", "frequency"]
vdumpfile=None
for opt, arg in options:
if opt in ('-v', '--verbose'):
verbose = True
elif opt in ('-g','--good'):
good = True
min_confidence=90
elif opt in ('--confidence'):
good = True
min_confidence=int(arg)
elif opt in ('-p', '--perfect'):
perfect = True
elif opt in ('-s', '--satclass'):
dosatclass = True
elif opt in ('--plot'):
plotargs=arg.split(',')
elif opt in ('--filter'):
linefilter=arg.split(',')
elif opt in ('--voice-dump'):
vdumpfile=arg
elif opt in ('-i', '--input'):
input=arg
elif opt in ('-o', '--output'):
output=arg
elif opt in ('--format'):
ofmt=arg.split(',');
else:
raise Exception("unknown argument?")
if input == "dump" or output == "dump":
import cPickle as pickle
dumpfile="pickle.dump"
if dosatclass == True:
import satclass
satclass.init()
if vdumpfile != None:
vdumpfile=open(vdumpfile,"wb")
class ParserError(Exception):
pass
class Zulu(datetime.tzinfo):
def utcoffset(self, dt):
return datetime.timedelta(0)
def dst(self, dt):
return datetime.timedelta(0)
def tzname(self,dt):
return "Z"
Z=Zulu()
tswarning=False
tsoffset=0
maxts=0
class Message(object):
def __init__(self,line):
self.parse_error=False
self.error=False
self.error_msg=[]
p=re.compile('RAW: ([^ ]*) (\d+) (\d+) A:(\w+) [IL]:(\w+) +(\d+)% ([\d.]+) +(\d+) ([\[\]<> 01]+)(.*)')
m=p.match(line)
if(not m):
self._new_error("Couldn't parse: "+line)
self.parse_error=True
return
self.filename=m.group(1)
if self.filename=="/dev/stdin":
self.filename="-";
self.timestamp=int(m.group(2))
self.frequency=int(m.group(3))
# self.access_ok=(m.group(4)=="OK")
# self.leadout_ok=(m.group(5)=="OK")
self.confidence=int(m.group(6))
self.level=float(m.group(7))
# self.raw_length=m.group(8)
self.bitstream_raw=symbol_reverse(re.sub("[\[\]<> ]","",m.group(9))) # raw bitstring with correct symbols
self.symbols=len(self.bitstream_raw)/2
if m.group(10):
self.extra_data=m.group(10)
self._new_error("There is crap at the end in extra_data")
# Make a "global" timestamp
global tswarning,tsoffset,maxts
mm=re.match("(\d\d)-(\d\d)-(20\d\d)T(\d\d)-(\d\d)-(\d\d)-[sr]1",self.filename)
if mm:
month, day, year, hour, minute, second = map(int, mm.groups())
ts=datetime.datetime(year,month,day,hour,minute,second)
ts=(ts- datetime.datetime(1970,1,1)).total_seconds()
ts+=float(self.timestamp)/1000
self.globaltime=ts
return
mm=re.match("i-(\d+(?:\.\d+)?)-[vbsrtl]1.([a-z])([a-z])",self.filename)
if mm:
b26=(ord(mm.group(2))-ord('a'))*26+ ord(mm.group(3))-ord('a')
self.b26=b26
ts=float(mm.group(1))+float(self.timestamp)/1000+b26*600
self.globaltime=ts
return
mm=re.match("i-(\d+(?:\.\d+)?)-[vbsrtl]1(?:-o[+-]\d+)?$",self.filename)
if mm:
ts=float(mm.group(1))+float(self.timestamp)/1000
self.globaltime=ts
return
if not tswarning:
print "Warning: no timestamp found in filename"
tswarning=True
ts=tsoffset+float(self.timestamp)/1000
if ts<maxts:
tsoffset=maxts
ts=tsoffset+float(self.timestamp)/1000
maxts=ts
self.globaltime=ts
def upgrade(self):
if self.error: return self
if(self.bitstream_raw.startswith(iridium_access)):
self.uplink=0
elif(self.bitstream_raw.startswith(uplink_access)):
self.uplink=1
else:
self._new_error("Access code missing")
return self
try:
return IridiumMessage(self).upgrade()
except ParserError,e:
self._new_error(str(e))
return self
def _new_error(self,msg):
self.error=True
msg=str(type(self).__name__) + ": "+msg
if not self.error_msg or self.error_msg[-1] != msg:
self.error_msg.append(msg)
def _pretty_header(self):
return "%s %09d %010d %3d%% %7.3f"%(self.filename,self.timestamp,self.frequency,self.confidence,self.level)
def _pretty_trailer(self):
return ""
def pretty(self):
if self.parse_error:
return "ERR: "
str= "RAW: "+self._pretty_header()
# str+= " "+self.bitstream_raw
bs=self.bitstream_raw
if (bs.startswith(iridium_access)):
str+=" <%s>"%iridium_access
bs=bs[len(iridium_access):]
elif (bs.startswith(uplink_access)):
str+=" <U%s>"%uplink_access
bs=bs[len(uplink_access):]
str+=" "+" ".join(slice(bs,16))
if("extra_data" in self.__dict__):
str+=" "+self.extra_data
str+=self._pretty_trailer()
return str
class IridiumMessage(Message):
def __init__(self,msg):
self.__dict__=msg.__dict__
if (self.uplink):
data=self.bitstream_raw[len(uplink_access):]
else:
data=self.bitstream_raw[len(iridium_access):]
# Try to detect packet type.
# XXX: will not detect packets with correctable bit errors at the beginning
if "msgtype" not in self.__dict__:
if data[:32] == header_messaging:
self.msgtype="MS"
if "msgtype" not in self.__dict__:
if data[:2] =="11" and data[2:96]=="0"*94:
self.msgtype="TL"
if "msgtype" not in self.__dict__:
hdrlen=6
blocklen=64
if len(data)>hdrlen+blocklen:
if ndivide(hdr_poly,data[:hdrlen])==0:
(o_bc1,o_bc2)=de_interleave(data[hdrlen:hdrlen+blocklen])
if ndivide(ringalert_bch_poly,o_bc1[:31])==0:
if ndivide(ringalert_bch_poly,o_bc2[:31])==0:
self.msgtype="BC"
if "msgtype" not in self.__dict__:
if len(data)>64: # XXX: heuristic based on LCW / first BCH block, can we do better?
(o_lcw1,o_lcw2,o_lcw3)=de_interleave_lcw(data[:46])
if ndivide( 29,o_lcw1)==0:
if ndivide( 41,o_lcw3)==0:
(e2,lcw2,bch)= bch_repair(465,o_lcw2+'0') # One bit missing, so we guess
if (e2==1): # Maybe the other one...
(e2,lcw2,bch)= bch_repair(465,o_lcw2+'1')
if e2==0:
self.msgtype="DA"
if "msgtype" not in self.__dict__:
firstlen=3*32
if len(data)>=3*32:
(o_ra1,o_ra2,o_ra3)=de_interleave3(data[:firstlen])
if ndivide(ringalert_bch_poly,o_ra1[:31])==0:
if ndivide(ringalert_bch_poly,o_ra2[:31])==0:
if ndivide(ringalert_bch_poly,o_ra3[:31])==0:
self.msgtype="RA"
if "msgtype" not in self.__dict__:
if len(data)<64:
raise ParserError("Iridium message too short")
else:
raise ParserError("unknown Iridium message type")
if self.msgtype=="MS":
hdrlen=32
self.header=data[:hdrlen]
self.descrambled=[]
(blocks,self.descramble_extra)=slice_extra(data[hdrlen:],64)
for x in blocks:
self.descrambled+=de_interleave(x)
elif self.msgtype=="TL":
hdrlen=96
self.header=data[:hdrlen]
self.descrambled=data[hdrlen:hdrlen+(256*3)]
self.descramble_extra=data[hdrlen+(256*3):]
elif self.msgtype=="RA":
firstlen=3*32
if len(data)<firstlen:
self._new_error("No data to descramble")
self.header=""
self.descrambled=de_interleave3(data[:firstlen])
(blocks,self.descramble_extra)=slice_extra(data[firstlen:],64)
for x in blocks:
self.descrambled+=de_interleave(x)
elif self.msgtype=="BC":
hdrlen=6
self.header=data[:hdrlen]
(e,d,bch)=bch_repair(hdr_poly,self.header)
self.bc_type = int(d, 2)
if e==0:
self.header="bc:%d" % self.bc_type
else:
self.header="%s/E%d"%(self.header,e)
self.descrambled=[]
(blocks,self.descramble_extra)=slice_extra(data[hdrlen:],64)
for x in blocks:
self.descrambled+=de_interleave(x)
elif self.msgtype=="DA":
lcwlen=46
(o_lcw1,o_lcw2,o_lcw3)=de_interleave_lcw(data[:lcwlen])
(e1,self.lcw1,bch)= bch_repair( 29,o_lcw1)
(e2,self.lcw2,bch)= bch_repair(465,o_lcw2+'0') # One bit error expected
if e2==1:
(e2,self.lcw2,bch)= bch_repair(465,o_lcw2+'1') # Other bit flip?
(e3,self.lcw3,bch)= bch_repair( 41,o_lcw3)
self.ft=int(self.lcw1,2) # Frame type
if e1<0 or e2<0 or e3<0:
# LCW:=xx[type] yyyy[code]
# 0: maint
# 6: geoloc
# f: "no text"
# c: maint [lqi[x1c,2], power[[x19,3]]
# 789abde: reserved
# 0: sync [status[xa,1], dtoa[xc,10], dfoa[x16,8]]
# 3: maint [lqi[xa,2], power[xc,3], fine dtoa[xf,7], fine dfoa[x16,3]]
# 245: reserved
# 1: switch [dtoa[xc,10], dfoa[x16,8]]
# 1: acchl
# 1: acchl
# *: reserved
# 2: handoff
# c: handoff cand.
# f: "no text"
# 3: handoff resp. [cand[%c[0=P,1=S::0xb,1]], denied[0xc,1], ref[xd,1], slot[xf,2]+1, subband up[x11,5], subband down[x16,5], access[x1b,3]+1]
# *: reserved
# 3: reserved
self._new_error("LCW decode failed")
self.header="LCW(%s %s/%02d E%d,%s %sx/%03d E%d,%s %s/%02d E%d)"%(o_ft[:3],o_ft[3:],ndivide(29,o_ft),e1,o_lcw2[:6],o_lcw2[6:],ndivide(465,o_lcw2+'0'),e2,o_lcw3[:21],o_lcw3[21:],ndivide(41,o_lcw3),e3)
else:
# self.header="LCW(%d,%s,%s E%d)"%(self.ft,self.lcw2,self.lcw3,e1+e2+e3)
self.lcw_ft=int(self.lcw2[:2],2)
self.lcw_code=int(self.lcw2[2:],2)
if self.lcw_ft == 0:
ty="maint"
if self.lcw_code == 6:
code="geoloc"
elif self.lcw_code == 15:
code="<silent>"
elif self.lcw_code == 12:
code="maint[1]"
code+="[lqi:%d,power:%d]"%(int(self.lcw3[19:21],2),int(self.lcw3[16:19],2))
elif self.lcw_code == 0:
code="sync"
code+="[status:%d,dtoa:%d,dfoa:%d]"%(int(self.lcw3[1:2],2),int(self.lcw3[3:13],2),int(self.lcw3[13:21],2))
elif self.lcw_code == 3:
code="maint[2]"
code+="[lqi:%d,power:%d,f_dtoa:%d,f_dfoa:%d]"%(int(self.lcw3[1:3],2),int(self.lcw3[3:6],2),int(self.lcw3[6:13],2),int(self.lcw3[13:20],2))
elif self.lcw_code == 1:
code="switch"
code+="[dtoa:%d,dfoa:%d]"%(int(self.lcw3[3:13],2),int(self.lcw3[13:21],2))
else:
code="rsrvd"
elif self.lcw_ft == 1:
ty="acchl"
if self.lcw_code == 1:
code="acchl"
else:
code="rsrvd"
elif self.lcw_ft == 2:
ty="hndof"
if self.lcw_code == 12:
code="handoff_cand"
elif self.lcw_code == 3:
code="handoff_resp"
code+="[cand:%d,denied:%d,ref:%d,slot:%d,sband_up:%d,sband_dn:%d,access:%d]"%(int(self.lcw3[2:3],2),int(self.lcw3[3:4],2),int(self.lcw3[4:5],2),1+int(self.lcw3[6:8],2),int(self.lcw3[8:13],2),int(self.lcw3[13:18],2),1+int(self.lcw3[18:21],2))
elif self.lcw_code == 15:
code="<silent>"
else:
code="rsrvd"
elif self.lcw_ft == 3:
ty="rsrvd"
code="<>"
self.header="LCW(%d,T:%s,C:%s(%s),%s E%d)"%(self.ft,ty,code,int(self.lcw2,2),int(self.lcw3,2),e1+e2+e3)
self.header="%-110s "%self.header
self.descrambled=[]
self.payload_r=[]
self.payload_f=[]
data=data[lcwlen:]
if self.ft<=3 and len(data)<312:
self._new_error("Not enough data in data packet")
if self.ft==0: # Voice
self.msgtype="VO"
for x in slice(data[:312],8):
self.descrambled+=[x]
self.payload_f+=[int(x,2)]
self.payload_r+=[int(x[::-1],2)]
self.descramble_extra=data[312:]
elif self.ft==1: # IP via PPP
self.msgtype="IP"
for x in slice(data[:312],8):
self.descrambled+=[x[::-1]]
self.descramble_extra=data[312:]
elif self.ft==2: # DAta (SBD)
self.descramble_extra=data[124*2+64:]
data=data[:124*2+64]
blocks=slice(data,124)
end=blocks.pop()
for x in blocks:
(b1,b2)=de_interleave(x)
(b1,b2,b3,b4)=slice(b1+b2,31)
self.descrambled+=[b4,b2,b3,b1]
(b1,b2)=de_interleave(end)
self.descrambled+=[b2[1:],b1[1:]] # Throw away the extra bit
elif self.ft==7: # Synchronisation
self.msgtype="SY"
self.descrambled=data[:312]
self.sync=[int(x,2) for x in slice(self.descrambled, 8)]
self.descramble_extra=data[312:]
elif self.ft==3: # Unknown data
self.msgtype="U3"
self.descrambled=data[:312]
self.payload=[int(x,2) for x in slice(self.descrambled, 6)]
self.descramble_extra=data[312:]
else: # Need to check what other ft are
self.msgtype="UK"
self.descrambled=data[:312]
self.descramble_extra=data[312:]
self.lead_out_ok= self.descramble_extra.startswith(iridium_lead_out)
if self.msgtype!="VO" and self.msgtype!="IP" and len(self.descrambled)==0:
self._new_error("No data to descramble")
def upgrade(self):
if self.error: return self
try:
if self.msgtype=="VO":
return IridiumVOMessage(self).upgrade()
elif self.msgtype=="IP":
return IridiumIPMessage(self).upgrade()
elif self.msgtype=="SY":
return IridiumSYMessage(self).upgrade()
elif self.msgtype=="U3":
return IridiumLCW3Message(self).upgrade()
elif self.msgtype=="TL":
return IridiumSTLMessage(self).upgrade()
elif self.msgtype=="UK":
return self # XXX: probably need to descramble/BCH it
return IridiumECCMessage(self).upgrade()
except ParserError,e:
self._new_error(str(e))
return self
return self
def _pretty_header(self):
str= super(IridiumMessage,self)._pretty_header()
str+= " %03d"%(self.symbols-len(iridium_access)/2)
# str+=" L:"+("no","OK")[self.lead_out_ok]
if (self.uplink):
str+=" UL"
else:
str+=" DL"
if self.header:
str+=" "+self.header
return str
def _pretty_trailer(self):
str= super(IridiumMessage,self)._pretty_trailer()
if self.descramble_extra != "":
str+= " descr_extra:"+re.sub(iridium_lead_out,"["+iridium_lead_out+"]",self.descramble_extra)
return str
def pretty(self):
sstr= "IRI: "+self._pretty_header()
sstr+= " %2s"%self.msgtype
if self.descrambled!="":
sstr+= " ["
sstr+=".".join(["%02x"%int("0"+x,2) for x in slice("".join(self.descrambled), 8) ])
sstr+="]"
sstr+= self._pretty_trailer()
return sstr
class IridiumSYMessage(IridiumMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
def upgrade(self):
return self
def _pretty_header(self):
return super(IridiumSYMessage,self)._pretty_header()
def _pretty_trailer(self):
return super(IridiumSYMessage,self)._pretty_trailer()
def pretty(self):
str= "ISY: "+self._pretty_header()
errs=0
for x in self.sync:
if x!=0xaa:
errs+=1 # Maybe count bit errors
if errs==0:
str+=" Sync=OK"
else:
str+=" Sync=no, errs=%d"%errs
str+=self._pretty_trailer()
return str
class IridiumSTLMessage(IridiumMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
self.header="<11>"
def upgrade(self):
return self
def _pretty_header(self):
return super(IridiumSTLMessage,self)._pretty_header()
def _pretty_trailer(self):
return super(IridiumSTLMessage,self)._pretty_trailer()
def pretty(self):
str= "ITL: "+self._pretty_header()
str+=" ["+".".join(["%02x"%int("0"+x,2) for x in slice("".join(self.descrambled[:256]), 8) ])+"]"
str+=" ["+".".join(["%02x"%int("0"+x,2) for x in slice("".join(self.descrambled[256:512]), 8) ])+"]"
str+=" ["+".".join(["%02x"%int("0"+x,2) for x in slice("".join(self.descrambled[512:]), 8) ])+"]"
str+=self._pretty_trailer()
return str
class IridiumLCW3Message(IridiumMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
(ok,msg,csum)=rs6.rs_fix(self.payload)
self.rs6p=False
self.rs6=ok
if ok:
if bytearray(self.payload)==msg+csum:
self.rs6p=True
self.rs6m=msg
self.rs6c=csum
# self.payload=msg
def upgrade(self):
return self
def _pretty_header(self):
return super(IridiumLCW3Message,self)._pretty_header()
def _pretty_trailer(self):
return super(IridiumLCW3Message,self)._pretty_trailer()
def pretty(self):
str= "IU3: "+self._pretty_header()
if self.rs6:
if self.rs6p:
str+=" RS=OK"
else:
str+=" RS=ok"
else:
str+=" RS=no"
if self.rs6:
str+=" {%02d}"%self.rs6m[0]
str+= " ["
v="".join(["{0:06b}".format(x) for x in self.rs6m ])
if self.rs6m[0]==0:
str+=v[:8]+"| "+group(v[8:],10)
elif self.rs6m[0]==6:
str+=group(v,8)
elif self.rs6m[0]==32:
str+=group(v,6)
else:
str+=group(v,6)
# if not self.rs6p:
# str+=" - "
# str+=".".join(["%02x"%x for x in self.rs6c ])
str+="]"
if self.rs6m[0]==6:
v="".join(["{0:06b}".format(x) for x in self.rs6m ])
w=[]
for x in xrange(8,len(v),24):
w+=[int(v[x:x+24],2)]
while len(w)>0 and w[-1]==0:
w=w[:-1]
str+=" <"+" ".join(["%06x"%x for x in w])+">"
else:
str+= " ["
v="".join(["{0:08b}".format(x) for x in self.payload ])
str+=group(v,24)
#str+=".".join(["%02x"%x for x in self.payload ])
str+="]"
str+=self._pretty_trailer()
return str
class IridiumVOMessage(IridiumMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
self.crcval=crc24(bytearray(self.payload_r))
if self.crcval==0:
self.vtype="VDA"
self.crc=struct.unpack(">L",bytearray([0]+self.payload_r[-3:]))
self.vdata=self.payload_r[5:-3]
self.vstype=self.payload_r[0]
self.vctr1=self.payload_r[1]
self.vuk1 =self.payload_r[2]
self.vctr2=self.payload_r[3]
self.vlen =self.payload_r[4]
else:
# if rs_check(self.payload_f):
(ok,msg,rsc)=rs.rs_fix(self.payload_f)
if ok:
self.vtype="VOD"
self.vdata=msg
else:
self.vtype="VOC"
self.vdata=self.payload_f
def upgrade(self):
return self
def _pretty_header(self):
return super(IridiumVOMessage,self)._pretty_header()
def _pretty_trailer(self):
return super(IridiumVOMessage,self)._pretty_trailer()
def pretty(self):
str= self.vtype+": "+self._pretty_header()
if self.vtype=="VDA":
if self.vstype==4:
str+= " type=%02x ct1=%03d ?=%02x ct2=%03d len=%03d "%(self.vstype,self.vctr1,self.vuk1,self.vctr2,self.vlen)
str+= "["
str+= ".".join(["%02x"%x for x in self.vdata[:self.vlen]])
str+= "]"
err=any(self.vdata[self.vlen:])
if err:
str+=" ERR"
str+= " "*(31-self.vlen)
else:
str+= " type=%02x ct1=%03d ?=%02x ct2=%03d "%(self.vstype,self.vctr1,self.vuk1,self.vctr2)
str+= " ["
str+= "%02x."%self.vlen
str+= ".".join(["%02x"%x for x in self.vdata])
str+= "]"
str+=" crc=%06x "%(self.crc)
for c in self.vdata:
if( c>=32 and c<127):
str+=chr(c)
else:
str+="."
else:
str+= " ["+".".join(["%02x"%x for x in self.vdata])+"]"
str+=self._pretty_trailer()
return str
class IridiumIPMessage(IridiumMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
self.payload_f=[int(x[::-1],2) for x in self.descrambled]
(ok,msg,rsc)=rs.rs_fix(self.payload_f)
if ok:
self.itype="IIQ"
self.idata=msg
csum1=0
csum2=0
for x in xrange(0,len(self.idata)-3,2):
csum1+=self.idata[x]
if csum1>255:
csum1=csum1&0xff
csum2+=1
csum2+=self.idata[x+1]
if csum2>255:
csum2=csum2&0xff
csum1+=1
csum1+=self.idata[-3] # Unclear if ever not=0
if csum1>255:
csum1=csum1&0xff
csum2+=1
self.iiqcsum=0xffff^(256*csum1+csum2)
if (self.iiqcsum == self.idata[-2]*256+self.idata[-1]):
self.itype="IIR"
self.idata=self.idata[0:-2]
else:
self.crcval=crc24(bytearray([int(x,2) for x in self.descrambled]))
if self.crcval==0:
self.itype="IIP"
self.ip_hdr=self.descrambled[0]
self.ip_ctr1=int(self.descrambled[1],2)
self.ip_uk1=self.descrambled[2]
self.ip_ctr2=int(self.descrambled[3],2)
self.ip_len= int(self.descrambled[4],2)
if self.ip_len>31:
#self._new_error("Invalid ip_len")
pass
self.ip_data=[int(x,2) for x in self.descrambled[5:31+5]] # XXX: only len bytes?
self.ip_cksum= self.descrambled[31+5:]
else:
self.itype="IIU"
def upgrade(self):
return self
def _pretty_header(self):
return super(IridiumIPMessage,self)._pretty_header()
def _pretty_trailer(self):
return super(IridiumIPMessage,self)._pretty_trailer()
def pretty(self):
s= self.itype+": "+self._pretty_header()
if self.itype=="IIP":
s+= " %s c1=%03d %s c2=%03d len=%03d"%(self.ip_hdr,self.ip_ctr1,self.ip_uk1,self.ip_ctr2,self.ip_len)
s+= " ["+".".join(["%02x"%x for x in self.ip_data])+"]"
s+= " %06x/%06x"%(int("".join(self.ip_cksum),2),self.crcval)
s+=" FCS:OK"
ip_data = ' IP: '
for c in self.ip_data:
if( c>=32 and c<127):
ip_data+=chr(c)
else:
ip_data+="."
s += ip_data
elif self.itype=="IIQ":
s+= " ["+" ".join(["%02x"%x for x in self.idata])+"]"
s+= " C=%04x"%self.iiqcsum
if (self.iiqcsum == self.idata[-2]*256+self.idata[-1]):
s+=" OK"
elif self.itype=="IIR":
s+= " ["+" ".join(["%02x"%x for x in self.idata])+"]"
else:
s+= " ["+" ".join(["%s"%x for x in self.descrambled])+"]"
s+=self._pretty_trailer()
return s
class IridiumECCMessage(IridiumMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
if self.msgtype == "MS":
self.poly=messaging_bch_poly
elif self.msgtype == "RA":
self.poly=ringalert_bch_poly
elif self.msgtype == "BC":
self.poly=ringalert_bch_poly
elif self.msgtype == "DA":
self.poly=acch_bch_poly
else:
raise ParserError("unknown Iridium message type(canthappen)")
self.bitstream_messaging=""
self.bitstream_bch=""
self.oddbits=""
self.fixederrs=0
for block in self.descrambled:
if len(block)!=32 and len(block)!=31:
raise ParserError("unknown BCH block len:%d"%len(block))
if len(block)==32:
bits=block[:31]
else:
bits=block
(errs,data,bch)=bch_repair(self.poly, bits)
if errs>0:
self.fixederrs+=1
if(errs<0):
if len(self.bitstream_bch) == 0:
self._new_error("BCH decode failed")
break
parity=(data+bch).count('1') % 2
if len(block)==32:
self.parity=(int(block[31])+parity)%2
if self.parity==1: raise ParserError("Parity error")
self.bitstream_bch+=data
self.bitstream_messaging+=data[1:]
self.oddbits+=data[0]
if len(self.bitstream_bch)==0:
self._new_error("No data to descramble")
def upgrade(self):
if self.error: return self
try:
if self.msgtype == "MS":
return IridiumMSMessage(self).upgrade()
elif self.msgtype == "RA":
return IridiumRAMessage(self).upgrade()
elif self.msgtype == "BC":
return IridiumBCMessage(self).upgrade()
elif self.msgtype == "DA":
return IridiumDAMessage(self).upgrade()
else:
self._new_error("Unknown message type")
except ParserError,e:
self._new_error(str(e))
return self
return self
def _pretty_header(self):
str= super(IridiumECCMessage,self)._pretty_header()
return str
def _pretty_trailer(self):
return super(IridiumECCMessage,self)._pretty_trailer()
def pretty(self):
str= "IME: "+self._pretty_header()+" "
for block in xrange(len(self.descrambled)):
b=self.descrambled[block]
if len(b)==31:
(errs,foo)=nrepair(self.poly,b)
res=ndivide(self.poly,b)
parity=(foo).count('1') % 2
str+="{%s %s/%04d E%s P%d}"%(b[:21],b[21:31],res,("0","1","2","-")[errs],parity)
elif len(b)==32:
(errs,foo)=nrepair(self.poly,b[:31])
res=ndivide(self.poly,b[:31])
parity=(foo+b[31]).count('1') % 2
str+="{%s %s %s/%04d E%s P%d}"%(b[:21],b[21:31],b[31],res,("0","1","2","-")[errs],parity)
else:
str+="length=%d?"%len(b)
str+=self._pretty_trailer()
return str
class IridiumDAMessage(IridiumECCMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
# Decode stuff from self.bitstream_bch
self.flags1=self.bitstream_bch[:4]
self.flag1b=self.bitstream_bch[4:5]
self.da_ctr=int(self.bitstream_bch[5:8],2)
self.flags2=self.bitstream_bch[8:12]
self.flags3=self.bitstream_bch[12:16]
self.zero1=int(self.bitstream_bch[16:20],2)
if self.zero1 != 0:
self._new_error("zero1 not 0")
def crc16(data): # 0x1021 / 0xffff unreflected
crc = 0xffff
for byte in data:
crc=crc^ord(byte)
for bit in range(0, 8):
if (crc&0x1):
crc = ((crc >> 1) ^ 0x8408)
else:
crc = crc >> 1
return crc ^ 0xdf9d
if len(self.bitstream_bch) < 9*20+16:
raise ParserError("Not enough data in data packet")
self.da_len=int(self.bitstream_bch[11:16],2)
if self.da_len>0:
self.da_crc=int(self.bitstream_bch[9*20:9*20+16],2)
self.da_ta=[int(x,2) for x in slice(self.bitstream_bch[20:9*20],8)]
crcstream=self.bitstream_bch[:16]+"0"*12+self.bitstream_bch[16:]
the_crc=crc16("".join([chr(int(x,2)) for x in crcstream]))
self.the_crc=the_crc
self.crc_ok=(the_crc==0)
else:
self.da_ta=[int(x,2) for x in slice(self.bitstream_bch[20:11*20],8)]
self.zero2=int(self.bitstream_bch[9*20+16:],2)
if self.zero2 != 0:
self._new_error("zero2 not 0")
sbd= self.bitstream_bch[1*20:9*20]
self.data=[]
for x in slice(sbd, 8):
self.data+=[int(x,2)]
def upgrade(self):
if self.error: return self
try:
return self
except ParserError,e:
self._new_error(str(e))
return self
return self
def _pretty_header(self):
return super(IridiumDAMessage,self)._pretty_header()
def _pretty_trailer(self):
return super(IridiumDAMessage,self)._pretty_trailer()
def pretty(self):
str= "IDA: "+self._pretty_header()
str+= " "+self.bitstream_bch[:3]
str+= " cont="+self.bitstream_bch[3:4]
str+= " "+self.bitstream_bch[4:5]
str+= " ctr="+self.bitstream_bch[5:8]
str+= " "+self.bitstream_bch[8:11]
str+= " len=%02d"%self.da_len
str+= " 0:"+self.bitstream_bch[16:20]
str+=" ["
if self.da_len>0:
if all([x==0 for x in self.da_ta[self.da_len+1:]]):
mstr= ".".join(["%02x"%x for x in self.da_ta[:self.da_len]])
else: # rest is not zero as it should be
mstr= ".".join(["%02x"%x for x in self.da_ta])
if self.da_len>0 and self.da_len<20:
mstr=mstr[:3*self.da_len-1]+'!'+mstr[3*self.da_len:]
else:
mstr= ".".join(["%02x"%x for x in self.da_ta])
str+= "%-60s"%(mstr+"]")
if self.da_len>0:
str+= " %04x"%int(self.bitstream_bch[9*20:9*20+16],2)
str+="/%04x"%self.the_crc
if self.crc_ok:
str+=" CRC:OK"
else:
str+=" CRC:no"
str+= " "+self.bitstream_bch[9*20+16:]
else:
str+=" --- "
str+= " "+self.bitstream_bch[9*20+16:]
if self.da_len>0:
sbd= self.bitstream_bch[1*20:9*20]
str+=' SBD: '
for x in slice(sbd, 8):
c=int(x,2)
if( c>=32 and c<127):
str+=chr(c)
else:
str+="."
str+=self._pretty_trailer()
return str
class IridiumBCMessage(IridiumECCMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
blocks, _ =slice_extra(self.bitstream_bch,21)
self.readable = ''
if len(blocks) > 1 and self.bc_type == 0:
data1 = blocks[0]
data2 = blocks[1]
self.sv_id = int(data1[0:7], 2)
self.beam_id = int(data1[7:13], 2)
self.unknown01 = data1[13:14]
self.timeslot = int(data1[14:15], 2)
self.sv_blocking = int(data1[15:16], 2)
self.acqu_classes = data1[16:21] + data2[0:11]
self.acqu_subband = int(data2[11:16], 2)
self.acqu_channels = int(data2[16:19], 2)
self.unknown02 = data2[19:21]
self.readable += 'sat:%02d cell:%02d %s ts:%d sv_blkn:%d aq_cl:%s aq_sb:%02d aq_ch:%d %s' % (self.sv_id, self.beam_id, self.unknown01, self.timeslot, self.sv_blocking, self.acqu_classes, self.acqu_subband, self.acqu_channels, self.unknown02)
blocks = blocks[2:]
if len(blocks) > 1 and self.bc_type == 0:
data1 = blocks[0]
data2 = blocks[1]
self.type = int(data1[0:6], 2)
if self.type == 0:
self.unknown11 = data1[6:21] + data2[0:15]
self.max_uplink_pwr = int(data2[15:21], 2)
self.readable += ' %s max_uplink_pwr:%02d' % (self.unknown11, self.max_uplink_pwr)
elif self.type == 1:
self.unknown21 = data1[6:10]
self.time = int(data1[10:21]+data2[0:21], 2)
# Different Iridium epochs that we know about:
# 2014-05-11T14:23:55Z : 1399818235 current one
# 2007-03-08T03:50:21Z : 1173325821
# 1996-06-01T00:00:11Z : 833587211 the original one
self.readable += ' %s time:%sZ' % (self.unknown21, datetime.datetime.fromtimestamp(self.time*90/1000+1399818235,tz=Z).strftime("%Y-%m-%dT%H:%M:%S"))
elif self.type == 2:
self.unknown31 = data1[6:10]
self.tmsi_expiry = int(data1[10:21] + data2[0:21], 2)
self.readable += ' %s tmsi_expiry:%02d' % (self.unknown31, self.tmsi_expiry)
elif self.type == 4:
if data1+data2 != "000100000000100001110000110000110011110000":
self.readable += ' type:%02d %s%s' % (self.type, data1, data2)
else: # Unknown Type
self.readable += ' type:%02d %s%s' % (self.type, data1, data2)
# raise ParserError("unknown BC Type %s"%self.type)
blocks = blocks[2:]
def parse_assignment(data1, data2):
result = ''
if(data1 + data2 != '111000000000000000000000000000000000000000'):
# Channel Assignment
unknown1 = data1[0:3]
unknown2 = data1[3:11]
timeslot = int(data1[11:13], 2)
uplink_subband = int(data1[13:18], 2)
downlink_subband = int(data1[18:21] + data2[0:2], 2)
unknown3 = data2[2:5]
dtoa = int(data2[5:13], 2)
dfoa = int(data2[13:19], 2)
unknown4 = data2[19:21]
result = ' %s %s ts:%d ul_sb:%02d dl_sb:%02d %s dtoa:%03d dfoa:%02d %s' % (unknown1, unknown2, timeslot, uplink_subband, downlink_subband, unknown3, dtoa, dfoa, unknown4)
return result
while len(blocks) > 1:
data1 = blocks[0]
data2 = blocks[1]
self.readable += parse_assignment(data1, data2)
blocks = blocks[2:]
def upgrade(self):
if self.error: return self
try:
return self
except ParserError,e:
self._new_error(str(e))
return self
return self
def _pretty_header(self):
return super(IridiumBCMessage,self)._pretty_header()
def _pretty_trailer(self):
return super(IridiumBCMessage,self)._pretty_trailer()
def pretty(self):
str= "IBC: "+self._pretty_header() + ' ' + self.readable
str+=self._pretty_trailer()
return str
class IridiumRAMessage(IridiumECCMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
# Decode stuff from self.bitstream_bch
if len(self.bitstream_bch)<64:
raise ParserError("RA content too short")
self.ra_sat= int(self.bitstream_bch[0:7],2) # sv_id
self.ra_cell= int(self.bitstream_bch[7:13],2) # beam_id
self.ra_pos_x= int(self.bitstream_bch[14:25],2) - int(self.bitstream_bch[13])*(1<<11)
self.ra_pos_y= int(self.bitstream_bch[26:37],2) - int(self.bitstream_bch[25])*(1<<11)
self.ra_pos_z= int(self.bitstream_bch[38:49],2) - int(self.bitstream_bch[37])*(1<<11)
self.ra_int= int(self.bitstream_bch[49:56],2) # 90ms interval of RA (within same sat/cell)
self.ra_ts= int(self.bitstream_bch[56:57],2) # Broadcast slot 1 or 4
self.ra_eip= int(self.bitstream_bch[57:58],2) # EPI ?
self.ra_bc_sb= int(self.bitstream_bch[58:63],2) # BCH downlink sub-band
self.ra_lat = atan2(self.ra_pos_z,sqrt(self.ra_pos_x**2+self.ra_pos_y**2))*180/pi
self.ra_lon = atan2(self.ra_pos_y,self.ra_pos_x)*180/pi
self.ra_alt = sqrt(self.ra_pos_x**2+self.ra_pos_y**2+self.ra_pos_z**2)*4
self.ra_msg= False
ra_msg=self.bitstream_bch[63:]