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bitsparser.py
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bitsparser.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# vim: set ts=4 sw=4 tw=0 et pm=:
import sys
import re
import struct
import fileinput
import datetime
from math import sqrt,atan2,pi,log
import crcmod
from bch import ndivide, nrepair, bch_repair, bch_repair1
import rs
import rs6
from util import *
import itl
iridium_access="001100000011000011110011" # Actually 0x789h in BPSK
uplink_access= "110011000011110011111100" # BPSK: 0xc4b
UW_DOWNLINK = [0,2,2,2,2,0,0,0,2,0,0,2]
UW_UPLINK = [2,2,0,0,0,2,0,0,2,0,2,2]
header_messaging="00110011111100110011001111110011" # 0x9669 in BPSK
header_time_location="11"+"0"*94
messaging_bch_poly=1897
ringalert_bch_poly=1207
acch_bch_poly=3545 # 1207 also works?
hdr_poly=29 # IBC header
f_doppler= 36e3 # maximum doppler_shift
f_jitter= 1e3 # iridium-extractor precision
sdr_ppm= 100e-6 # SDR freq offset
f_simplex = (1626104e3 - f_doppler - f_jitter ) * (1- sdr_ppm) # lower bound for simplex channel
f_duplex = (1625979e3 + f_doppler + f_jitter ) * (1+ sdr_ppm) # upper bound for duplex cannel
# commandline arguments
args = None
def set_opts(new_args):
global args
args = new_args
class ParserError(Exception):
def __init__(self, message):
super().__init__(message)
self.cls=sys._getframe(1).f_locals['self'].__class__.__name__
tswarning=False
tsoffset=0
maxts=0
class Message(object):
p=re.compile(r'(RAW|RWA): ([^ ]*) (-?[\d.]+) (\d+) (?:N:([+-]?\d+(?:\.\d+)?)([+-]\d+(?:\.\d+)?)|A:(\w+)) [IL]:(\w+) +(\d+)% ([\d.]+|inf|nan) +(\d+) ([\[\]<> 01]+)(.*)')
parse_error=False
error=False
def __init__(self,line):
self.error_msg=[]
self.lineno=fileinput.lineno()
m=self.p.match(line)
if(args.errorfile != None):
self.line=line
if(not m):
self._new_error("Couldn't parse: "+line)
self.parse_error=True
return
self.swapped=(m.group(1)=="RAW")
self.filename=m.group(2)
if self.filename=="/dev/stdin":
self.filename="-";
self.timestamp=float(m.group(3))
if self.timestamp<0 or self.timestamp>1000*60*60*24*999: # 999d
self._new_error("Timestamp out of range")
self.frequency=int(m.group(4))
if args.channelize:
self.freq_print=channelize_str(self.frequency)
else:
self.freq_print="%010d"%(self.frequency)
if m.group(5) is not None:
self.snr=float(m.group(5))
self.noise=float(m.group(6))
else:
self.access_ok=(m.group(7)=="OK")
self.id=m.group(8)
self.confidence=int(m.group(9))
self.level=float(m.group(10))
if self.level==0:
self.level=float(m.group(10)+"1")
self.leveldb=20*log(self.level,10)
# self.raw_length=m.group(11)
self.bitstream_raw=(re.sub(r"[\[\]<> ]","",m.group(12))) # raw bitstring with correct symbols
if self.swapped:
self.bitstream_raw=symbol_reverse(self.bitstream_raw)
self.symbols=len(self.bitstream_raw)//2
if m.group(13):
self.extra_data=m.group(13)
self._new_error("There is crap at the end in extra_data")
# Make a "global" timestamp - needs to be an int to avoid precision loss
# Current format:
mm=re.match(r"i-(\d+)-t1$",self.filename)
if mm:
startts=int(mm.group(1))
self.fileinfo="p-%d"%startts
self.globalns=startts*(10**9)+int(float(self.timestamp)*(10**6))
return
# Older file formats:
mm=re.match(r"(\d\d)-(\d\d)-(20\d\d)T(\d\d)-(\d\d)-(\d\d)-[sr]1",self.filename)
if mm:
month, day, year, hour, minute, second = map(int, mm.groups())
ts=datetime.datetime(year,month,day,hour,minute,second)
startts=int(ts.timestamp())
self.fileinfo="p-%d"%startts
self.globalns=startts*(10**9)+int(float(self.timestamp)*(10**6))
return
mm=re.match(r"i-(\d+(?:\.\d+)?)-[vbsrtl]1.([a-z])([a-z])",self.filename)
if mm:
self.b26=(ord(mm.group(2))-ord('a'))*26+ ord(mm.group(3))-ord('a')
startts=float(mm.group(1))+self.b26*600
if startts != int(startts):
self.timestamp+=(startts%1)*(10**3)
startts=int(startts)
self.fileinfo="p-%d"%startts
self.globalns=startts*(10**9)+int(float(self.timestamp)*(10**6))
return
mm=re.match(r"i-(\d+(?:\.\d+)?)-[vbsrtl]1(?:-o[+-]\d+)?$",self.filename)
if mm:
startts=float(mm.group(1))
if startts != int(startts):
self.timestamp+=(startts%1)*(10**3)
startts=int(startts)
self.fileinfo="p-%d"%startts
self.globalns=startts*(10**9)+int(float(self.timestamp)*(10**6))
return
global tswarning,tsoffset,maxts
self.fileinfo="u-"+self.filename.replace("-",".")
if not tswarning:
print("Warning: no timestamp found in filename", file=sys.stderr)
tswarning=True
ts=tsoffset+float(self.timestamp)/1000
if ts<maxts:
tsoffset=maxts
ts=tsoffset+float(self.timestamp)/1000
maxts=ts
self.globalns=int(ts*(10**9))
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:
if args.uwec and len(self.bitstream_raw)>=len(iridium_access):
access=de_dqpsk(self.bitstream_raw[:len(iridium_access)])
if bitdiff(access,UW_DOWNLINK) <4:
self.uplink=0
self.ec_uw=bitdiff(access,UW_DOWNLINK)
elif bitdiff(access,UW_UPLINK) <4:
self.uplink=1
self.ec_uw=bitdiff(access,UW_UPLINK)
else:
self._new_error("Access code distance too big: %d/%d "%(bitdiff(access,UW_DOWNLINK),bitdiff(access,UW_UPLINK)))
if("uplink" not in self.__dict__):
self._new_error("Access code missing")
return self
try:
return IridiumMessage(self).upgrade()
except ParserError as e:
self._new_error(str(e), e.cls)
return self
def _new_error(self,msg, cls=None):
self.error=True
if cls is None:
msg=str(type(self).__name__) + ": "+msg
else:
msg=cls + ": "+msg
if not self.error_msg or self.error_msg[-1] != msg:
self.error_msg.append(msg)
def _pretty_header(self):
flags=""
if args.uwec or args.harder or not args.perfect:
flags="-e"
if("ec_uw" in self.__dict__):
flags+="%d"%self.ec_uw
else:
flags+="0"
if("ec_lcw" in self.__dict__):
flags+="%d"%self.ec_lcw
else:
flags+="0"
if("fixederrs" in self.__dict__):
if self.fixederrs>9:
flags+="9"
else:
flags+="%d"%self.fixederrs
else:
flags+="0"
hdr="%s%s %014.4f"%(self.fileinfo,flags,self.timestamp)
if "snr" not in self.__dict__:
return "%s %s %3d%% %7.3f"%(hdr,self.freq_print,self.confidence,self.level)
else:
return "%s %s %3d%% %06.2f|%07.2f|%05.2f"%(hdr,self.freq_print,self.confidence,self.leveldb,self.noise,self.snr)
def _pretty_trailer(self):
return ""
def pretty(self):
if self.parse_error:
return "ERR: "
str= "RAW: "+self._pretty_header()
bs=self.bitstream_raw
if "uplink" in self.__dict__:
str+= " %03d"%(self.symbols-len(iridium_access)//2)
if (self.uplink):
str+=" UL"
else:
str+=" DL"
str+=" <%s>"%bs[:len(iridium_access)]
bs=bs[len(iridium_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.
# Will not detect packets with correctable bit errors at the beginning
# unless '--harder' is specifed
if "msgtype" not in self.__dict__ and (not args.freqclass or self.frequency > f_simplex) and not (args.freqclass and self.uplink):
if data[:32] == header_messaging:
self.msgtype="MS"
if "msgtype" not in self.__dict__ and args.linefilter['type'] == "IridiumMSMessage":
self._new_error("filtered message")
return
if "msgtype" not in self.__dict__ and (not args.freqclass or self.frequency > f_simplex) and not (args.freqclass and self.uplink):
if data[:96]==header_time_location:
self.msgtype="TL"
if "msgtype" not in self.__dict__ and args.linefilter['type'] == "IridiumSTLMessage":
self._new_error("filtered message")
return
if "msgtype" not in self.__dict__ and (not args.freqclass or self.frequency < f_duplex) and not (args.freqclass and self.uplink):
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__ and args.linefilter['type'] == "IridiumBCMessage":
self._new_error("filtered message")
return
if "msgtype" not in self.__dict__ and (not args.freqclass or self.frequency < f_duplex):
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="LW"
if "msgtype" not in self.__dict__ and args.linefilter['type'] == "IridiumLCWMessage":
self._new_error("filtered message")
return
if "msgtype" not in self.__dict__ and (not args.freqclass or self.frequency > f_simplex) and not (args.freqclass and self.uplink):
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__ and args.linefilter['type'] == "IridiumRAMessage":
self._new_error("filtered message")
return
if "msgtype" not in self.__dict__ and (not args.freqclass or self.frequency < f_duplex) and self.uplink:
if len(data)>=2*26 and len(data)<2*50:
self.msgtype="AQ"
if "msgtype" not in self.__dict__:
if args.harder:
# try IBC
if len(data)>=70 and not (args.freqclass and self.uplink):
hdrlen=6
blocklen=64
(e1,_,_)=bch_repair1(hdr_poly,data[:hdrlen])
(o_bc1,o_bc2)=de_interleave(data[hdrlen:hdrlen+blocklen])
(e2,d2,b2)=bch_repair(ringalert_bch_poly,o_bc1[:31])
(e3,d3,b3)=bch_repair(ringalert_bch_poly,o_bc2[:31])
if e1>=0 and e2>=0 and e3>=0:
if ((d2+b2+o_bc1[31]).count('1') % 2)==0:
if ((d3+b3+o_bc2[31]).count('1') % 2)==0:
self.msgtype="BC"
self.ec_lcw=e1
# try for LCW
if "msgtype" not in self.__dict__ and len(data)>=64:
(o_lcw1,o_lcw2,o_lcw3)=de_interleave_lcw(data[:46])
(e1 ,lcw1,bch)=bch_repair( 29,o_lcw1) # BCH(7,3)
(e2a,lcw2,bch)=bch_repair(465,o_lcw2+'0') # BCH(13,16)
(e2b,lcw2,bch)=bch_repair(465,o_lcw2+'1')
(e3 ,lcw3,bch)=bch_repair( 41,o_lcw3) # BCH(26,21)
e2=e2a
if (e2b>=0 and e2b<e2a) or (e2a<0):
e2=e2b
if e1>=0 and e2>=0 and e3>=0:
self.msgtype="LW"
self.ec_lcw=(e1+e2+e3)
# try for IRA
firstlen=3*32
if "msgtype" not in self.__dict__ and len(data)>=firstlen and not (args.freqclass and self.uplink):
(o_ra1,o_ra2,o_ra3)=de_interleave3(data[:firstlen])
(e1,d1,b1)=bch_repair(ringalert_bch_poly,o_ra1[:31])
(e2,d2,b2)=bch_repair(ringalert_bch_poly,o_ra2[:31])
(e3,d3,b3)=bch_repair(ringalert_bch_poly,o_ra3[:31])
if e1>=0 and e2>=0 and e3>=0:
if ((d1+b1+o_ra1[31]).count('1') % 2)==0:
if ((d2+b2+o_ra2[31]).count('1') % 2)==0:
if ((d3+b3+o_ra3[31]).count('1') % 2)==0:
self.msgtype="RA"
# try ITL
if "msgtype" not in self.__dict__ and len(data)>=96+(8*8*12) and not (args.freqclass and self.uplink):
if bitdiff(data[:96],header_time_location)<4:
self.ec_lcw=1
self.msgtype="TL"
# try IMS
if "msgtype" not in self.__dict__ and len(data)>=32 and not (args.freqclass and self.uplink):
if bitdiff(data[:32],header_messaging)<2:
self.ec_lcw=1
self.msgtype="MS"
if "msgtype" not in self.__dict__:
if len(data)<64:
raise ParserError("Iridium message too short")
if args.forcetype:
self.msgtype=args.forcetype.partition(':')[0]
if "msgtype" not in self.__dict__:
raise ParserError("unknown Iridium message type")
if self.msgtype=="MS":
hdrlen=32
self.header=data[:hdrlen]
if self.header==header_messaging:
self.header=""
self.descrambled=[]
(blocks,self.descramble_extra)=slice_extra(data[hdrlen:],64)
for x in blocks:
self.descrambled+=de_interleave(x)
elif self.msgtype=="AQ":
datalen=2*26
self.header=""
self.descrambled=data[:datalen]
self.descramble_extra=data[datalen:]
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=[]
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_repair1(hdr_poly,self.header)
self.bc_type = int(d, 2)
if e<0:
self.header="%s/E%d"%(self.header,e)
if not args.forcetype:
self._new_error("IBC header error")
else:
self.header=""
self.descrambled=[]
(blocks,self.descramble_extra)=slice_extra(data[hdrlen:],64)
for x in blocks:
self.descrambled+=de_interleave(x)
elif self.msgtype=="LW":
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
(e2b,lcw2b, bch)= bch_repair(465,o_lcw2+'1') # Other bit flip?
(e3,self.lcw3, bch)= bch_repair( 41,o_lcw3)
if (e2b>=0 and e2b<=e2) or (e2<0):
e2=e2b
self.lcw2=lcw2b
self.ft=int(self.lcw1,2) # Frame type
if e1<0 or e2<0 or e3<0:
if not ( args.forcetype and ':' in args.forcetype):
self._new_error("LCW decode failed")
self.header="LCW(%s_%s/%01dE%d,%s_%sx/%03dE%d,%s_%s/%06dE%d)"%(o_lcw1[:3],o_lcw1[3:],int(self.lcw1,2),e1,o_lcw2[:6],o_lcw2[6:],int(self.lcw2,2),e2,o_lcw3[:21],o_lcw3[21:],int(self.lcw3,2),e3)
data=data[lcwlen:]
self.descramble_extra=data[312:]
self.descrambled=data[:312]
else:
raise Exception("Illegal Iridium frame type")
def upgrade(self):
if self.error: return self
try:
if self.msgtype=="LW":
return IridiumLCWMessage(self).upgrade()
elif self.msgtype=="TL":
return IridiumSTLMessage(self).upgrade()
elif self.msgtype=="AQ":
return IridiumAQMessage(self).upgrade()
elif self.msgtype in ("MS", "RA", "BC"):
return IridiumECCMessage(self).upgrade()
raise AssertionError("unknown frame type encountered")
except ParserError as e:
self._new_error(str(e), e.cls)
return self
return self
def _pretty_header(self):
str= super()._pretty_header()
str+= " %03d"%(self.symbols-len(iridium_access)//2)
if (self.uplink):
str+=" UL"
else:
str+=" DL"
if self.header:
str+=" "+self.header
return str
def _pretty_trailer(self):
str= super()._pretty_trailer()
if("descramble_extra" in self.__dict__) and self.descramble_extra != "":
str+= " descr_extra:"+self.descramble_extra
return str
def pretty(self):
sstr= "IRI: "+self._pretty_header()
sstr+= " %2s"%self.msgtype
if self.msgtype == "TL" and "i" in self.__dict__:
sstr+= " <"+" ".join(self.i)+">"
sstr+= " <"+" ".join(self.q)+">"
elif 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 IridiumLCWMessage(IridiumMessage):
def __init__(self,msg):
self.__dict__=msg.__dict__
if args.forcetype and ':' in args.forcetype:
self.ft=int(args.forcetype.partition(':')[2])
data=self.descrambled
self.pretty_lcw()
if self.ft<=3 and len(data)<312:
self._new_error("Not enough data in data packet")
self.descrambled=[]
self.payload_r=[]
self.payload_f=[]
if self.ft==0: # Voice - Mission data - voice
self.msgtype="VO"
for x in slice(data,8):
self.descrambled+=[x]
self.payload_f+=[int(x,2)]
self.payload_r+=[int(x[::-1],2)]
self.payload_6=[int(x,2) for x in slice(data[:312], 6)]
elif self.ft==1: # IP via PPP - Mission data - data
self.msgtype="IP"
for x in slice(data,8):
self.descrambled+=[x[::-1]]
self.payload_f+=[int(x,2)]
self.payload_r+=[int(x[::-1],2)]
elif self.ft==2: # DAta (SBD) - Mission control data - ISU/SV
self.msgtype="DA"
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
self.sync=[int(x,2) for x in slice(self.descrambled, 8)]
elif self.ft==3: # Mission control data - inband sig
self.msgtype="U3"
self.descrambled=data
self.payload6=[int(x,2) for x in slice(self.descrambled, 6)]
self.payload8=[int(x,2) for x in slice(self.descrambled, 8)]
elif self.ft==6: # "PT=,"
self.msgtype="U6"
self.descrambled=data
else: # Need to check what other ft are
self.msgtype="U%d"%self.ft
self.descrambled=data
if self.msgtype!="VO" and self.msgtype!="IP" and len(self.descrambled)==0:
self._new_error("No data to descramble")
def upgrade(self):
if args.linefilter['type']=='IridiumLCW3Message' and self.msgtype!="U3":
self._new_error("filtered message")
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=="DA":
return IridiumLCWECCMessage(self).upgrade()
elif self.msgtype=="U3":
return IridiumLCW3Message(self).upgrade()
elif self.msgtype.startswith("U"):
return self # XXX: probably need to descramble/BCH it
raise AssertionError("unknown frame type encountered")
except ParserError as e:
self._new_error(str(e), e.cls)
return self
return self
def pretty_lcw(self):
# 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.lcw_ft=int(self.lcw2[:2],2)
self.lcw_code=int(self.lcw2[2:],2)
lcw3bits=self.lcw3
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))
lcw3bits="%s"%(self.lcw3[:16])
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))
lcw3bits="%s|%s"%(self.lcw3[0],self.lcw3[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))
lcw3bits="%s|%s"%(self.lcw3[0],self.lcw3[20:])
elif self.lcw_code == 1:
code="switch"
code+="[dtoa:%d,dfoa:%d]"%(int(self.lcw3[3:13],2),int(self.lcw3[13:21],2))
lcw3bits="%s"%(self.lcw3[0:3])
else:
code="rsrvd(%d)"%(self.lcw_code)
elif self.lcw_ft == 1:
ty="acchl"
if self.lcw_code == 1:
code="acchl" # 1(0), 3(msg_type), 1(block_num), 3(sapi_code), 8(segm_list), 5(unused)
code+="[msg_type:%01x,bloc_num:%01x,sapi_code:%01x,segm_list:%08s]"%(int(self.lcw3[1:4],2),int(self.lcw3[4:5],2),int(self.lcw3[5:8],2),self.lcw3[8:16])
lcw3bits="%s,%02x"%(self.lcw3[:1],int(self.lcw3[16:],2))
else:
code="rsrvd(%d)"%(self.lcw_code)
elif self.lcw_ft == 2:
ty="hndof"
if self.lcw_code == 12:
code="handoff_cand"
lcw3bits="%s,%s"%(self.lcw3[:11],self.lcw3[11:])
elif self.lcw_code == 3:
code="handoff_resp"
code+="[cand:%s,denied:%d,ref:%d,slot:%d,sband_up:%d,sband_dn:%d,access:%d]"%(['P','S'][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))
lcw3bits="%s,%s"%(self.lcw3[0:2],self.lcw3[5:6])
elif self.lcw_code == 15:
code="<silent>"
else:
code="rsrvd(%d)"%(self.lcw_code)
elif self.lcw_ft == 3:
ty="rsrvd"
code="<%d>"%(self.lcw_code)
self.header="LCW(%d,T:%s,C:%s,%s)"%(self.ft,ty,code,lcw3bits)
self.header="%-110s "%self.header
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(IridiumLCWMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
def upgrade(self):
self.fixederrs=(1+bitdiff(self.descrambled,"10"*(len(self.descrambled)//2)))//2 # count symbols
if self.uplink:
fe=(1+bitdiff(self.descrambled,"11"*(len(self.descrambled)//2)))//2 # count symbols
if fe + 5 < self.fixederrs:
self.fixederrs=fe
self.pattern="11"
else:
self.pattern="10"
return self
def pretty(self):
str= "ISY: "+self._pretty_header()
if self.fixederrs==0:
str+=" Sync=OK"
else:
str+=" Sync=no errs=%d"%self.fixederrs
if len(self.descrambled) < 312:
str+=" short:%s "%len(self.descrambled)
if self.uplink:
str+=" pattern=%s"%self.pattern
str+=self._pretty_trailer()
return str
iaq_crc16=crcmod.mkCrcFun(poly=0x15101,initCrc=0,rev=False,xorOut=0)
class IridiumAQMessage(IridiumMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
self.fixederrs=0
self.sym=[]
imap=['0','e','e','1']
bits=self.descrambled
for x in range(0,len(bits)-1,2):
self.sym.append(imap[int(bits[x+0])*2 + int(bits[x+1])])
if 'e' in self.sym:
raise ParserError("IAQ content not BPSK")
self.rid=int(self.sym[4]+self.sym[6]+self.sym[8]+self.sym[10]+self.sym[5]+self.sym[7]+self.sym[9]+self.sym[11],2)
self.val=bytes([int("".join(self.sym[:4]),2),int("".join(self.sym[4:12]),2)])
self.ridcrc=int("".join(self.sym[12:]),2)
self.crcval=iaq_crc16( bytes(self.val)) >>2
def upgrade(self):
return self
def pretty(self):
st= "IAQ: "+self._pretty_header()
st+= " " + "".join(self.sym[0:4])
st+= " " + "Rid:%03d"%self.rid
if self.ridcrc==self.crcval:
st+= " " + "CRC:OK"
else:
st+= " " + "CRC:no[%04x]"%self.ridcrc
st+=self._pretty_trailer()
return st
class IridiumSTLMessage(IridiumMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
if not args.forcetype:
self.header="<11>"
else:
self.header="<"+self.header+">"
self.fixederrs=0
if len(self.descrambled) < 8*8*12: # 12 blocks of 8 bytes
raise ParserError("ITL content too short")
symbols=de_dqpsk(self.descrambled)
(i_list,q_list)=split_qpsk(symbols)
i_list=["%02x"%int(x,2) for x in slice(i_list,8)]
q_list=["%02x"%int(x,2) for x in slice(q_list,8)]
self.i=["".join(x) for x in (i_list[:16],i_list[16:])]
self.q=["".join(x) for x in slice(q_list,12)]
if args.harder:
MAX_DIFF=10
self.ib=[bin(int(x, 16))[2:].zfill(len(x*4)) for x in self.i]
# Try to determine ITL version
self.itl_version= None
try:
self.itl_version= itl.PRS_HDR.index(self.i[0])
except ValueError:
if args.harder: # harder only supports V2
if bitdiff(self.ib[0],itl.BIN_HDR[2])<MAX_DIFF:
self.fixederrs+= 1
self.itl_version= 2
else:
raise ParserError("ITL PRS I#0 (version) unknown")
else:
raise ParserError("ITL PRS I#0 (version) unknown")
self.header="V%d"%self.itl_version
if self.itl_version==0: # No decoding yet
self.i= ["".join(x) for x in slice(i_list,16)]
self.q= ["".join(x) for x in slice(q_list,16)]
return
elif self.itl_version==1:
try:
self.plane= itl.MAP_PLANE_V1[self.i[1]]
except KeyError:
raise ParserError("ITL V1 PRS I#1 (plane) unknown")
self.msg=[]
for i,x in enumerate(self.q):
if x in itl.MAP_PRS_V1:
self.msg.append(itl.MAP_PRS_V1[x])
else:
if i==0 or self.msg[0]<77: # M8 does not contain normal PRS'
raise ParserError("ITL V1 PRS Q#%d unknown"%i)
self.msg.append(x)
elif self.itl_version==2 and not args.harder:
try:
self.plane= itl.MAP_PLANE[self.i[1]]
except KeyError:
raise ParserError("ITL V2 PRS I#1 (plane) unknown")
self.msg=[]
for i,x in enumerate(self.q):
if x in itl.MAP_PRS:
self.msg.append(itl.MAP_PRS[x])
else:
if i==0 or self.msg[0] != 108: # special message does not contain normal PRS
raise ParserError("ITL V2 PRS Q#%d unknown"%i)
self.msg.append(x)
if self.msg[0] != 108:
#sanity check the PRS sequence order
sanity = "".join([str(itl.MAP_PRS_TYPE[x]) for x in self.q])
if self.plane%2 == 0:
if sanity not in ("0123","1032"):
raise ParserError("ITL V2 PRS from unexpected set")
else:
if sanity not in ("2301","3210"):
raise ParserError("ITL V2 PRS from unexpected set")
elif self.itl_version==2 and args.harder:
self.plane=None
self.msg=[None]*4
if self.i[1] in itl.MAP_PLANE:
self.plane= itl.MAP_PLANE[self.i[1]]
else:
for i,p in enumerate(itl.BIN_PLANES):
if bitdiff(self.ib[1],p)<MAX_DIFF*2:
self.plane=i+1
self.fixederrs+=1
break
if self.plane is None:
raise ParserError("ITL V2 PRS I#1 (plane) unknown")
cat=None
for qidx in range(len(self.q)):
mindist=999
if qidx > 0 and self.msg[0] == 108:
self.msg[qidx]=self.q[qidx]
next
if self.q[qidx] in itl.MAP_PRS:
self.msg[qidx]= itl.MAP_PRS[self.q[qidx]]
cat=itl.MAP_PRS_TYPE[self.q[qidx]]
else:
q=bin(int(self.q[qidx], 16))[2:].zfill(len(self.q[qidx]*4))
if qidx==0: # Only search in correct PRS subset
if self.plane%2==0:
s=0
e=256
else:
s=256
e=512
elif qidx==1 or qidx==3:
cat^=1
s=128*cat
e=128*(cat+1)
elif qidx==2:
cat^=3
s=128*cat
e=128*(cat+1)
else:
raise AssertionError("ITL category error")
for i,prs in enumerate(itl.BIN_PRS[s:e]):
dist=bitdiff(q,prs)
if dist<mindist: mindist=dist
if dist<MAX_DIFF:
self.msg[qidx]=i%128
if cat is None:
cat=(i+s)//128
self.fixederrs+=1
break
if self.msg[qidx] is None:
self._new_error("ITL V2 PRS Q#%d unknown"%qidx)
raise ParserError("ITL PRS dist=%d"%mindist)
else:
raise AssertionError("ITL version error")
try:
(self.sat, self.mt)= itl.map_sat(self.msg[0], self.itl_version)
except ValueError:
raise ParserError("ITL invalid sat ID")
self.msg=self.msg[1:]
def upgrade(self):
return self
def pretty(self):
st= "ITL: "+self._pretty_header()
if self.itl_version==0:
st+= " -"
st+= " <"+" ".join(self.i)+">"
st+= " <"+" ".join(self.q)+">"
elif self.itl_version==1:
st+= " OK P%d"%self.plane
st+= " "+self.sat+" "+self.mt
for x in self.msg:
try:
st+= " "+"{0:07b}".format(x)
except ValueError:
st+= " "+x
else:
st+=" OK P%d"%self.plane
st+=" "+self.sat+" "+self.mt
for x in self.msg:
try:
st+= " "+"{0:07b}".format(x)
except ValueError:
st+= " "+x
st+=self._pretty_trailer()
return st
class IridiumLCW3Message(IridiumLCWMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
self.utype="IU3"
self.rs8p=False
self.rs6p=False
self.fixederrs=0
(ok,msg,csum)=rs.rs_fix(self.payload8)
self.rs8=ok
if ok:
self.utype="I38"
if bytearray(self.payload8)==msg+csum:
self.rs8p=True
else:
self.fixederrs+=1
self.rs8m=msg
self.rs8c=csum
self.csum=checksum_16(self.rs8m)
else:
(ok,msg,csum)=rs6.rs_fix(self.payload6)
self.rs6=ok
if ok:
self.utype="I36"
if bytearray(self.payload6)==msg+csum:
self.rs6p=True
else:
self.fixederrs+=1
self.rs6m=msg
self.rs6c=csum
def upgrade(self):
return self
def pretty(self):
str= self.utype+": "+self._pretty_header()
if self.utype=='I38':
if self.rs8p:
str+=" RS8=OK"
else:
str+=" RS8=ok"
if self.csum==0:
str+=" CS=OK"
self.rs8m=self.rs8m[0:-3]
remove_zeros(self.rs8m)
else:
str+=" CS=no"
str+= " ["
str+=" ".join(["%02x"%(x) for x in self.rs8m ])
str+= "]"
elif self.utype=='I36':
if self.rs6p:
str+=" RS6=OK"
else:
str+=" RS6=ok"
str+=" {%02d}"%self.rs6m[0]
str+= " ["
num=None
v="".join(["{0:06b}".format(x) for x in self.rs6m[1:] ])
if self.rs6m[0]==0:
str+=v[:2]+"| "+group(v[2:],10)
elif self.rs6m[0]==6:
str+=v[:2]+"| "+group(v[2:],24)
num=[int(x,2) for x in slice(v[2:],24)]
remove_zeros(num)
elif self.rs6m[0]==32 or self.rs6m[0]==34:
str+=v[:2]+"| "+group(v[2:],24)
num=[int(x,2) for x in slice(v[2:-4],24)]
if int(v[-4:],2)!=0:
num+=[int(v[-4:],2)]
while len(num)>0 and num[-1]==0x7ffff:
num=num[:-1]
else:
str+=group(v,6)
str+="]"
if num is not None:
str+=" <"+" ".join(["%06x"%x for x in num])+">"
else:
str+=" RS=no"
str+= " ["
str+=group(self.descrambled,8)
str+="]"
str+=self._pretty_trailer()
return str
class IridiumVOMessage(IridiumLCWMessage):
def __init__(self,imsg):
self.__dict__=imsg.__dict__
# Test if CRC24 is ok -> VDA
self.crcval=iip_crc24( bytes(self.payload_r))
if self.crcval==0:
self.vtype="VDA"
return
# Test if rs6 accepts it -> VO6 (unknown)
(ok,msg,csum)=rs6.rs_fix(self.payload_6)
self.rs6p=False
self.rs6=ok