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#!/usr/bin/env python
#
# CCC Event HLR management common stuff
#
#
# Copyright (C) 2010 Sylvain Munaut <tnt@246tNt.com>
#
# 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/>.
#
import hashlib
import os
import random
from collections import namedtuple
try:
import json
except Importerror:
# Python < 2.5
import simplejson as json
#
# Various helpers
#
def isnum(s, l=-1):
return s.isdigit() and ((l== -1) or (len(s) == l))
#
# Storage tuples
#
CardParameters = namedtuple("CardParameters", "num iccid imsi ki")
NetworkParameters = namedtuple("NetworkParameters", "name cc mcc mnc smsp")
#
# State management
#
class StateManager(object):
def __init__(self, filename=None, options=None):
# Filename for state storage
self._filename = filename
# Params from options
self._net_name = options.name if options else None
self._net_cc = options.country if options else None
self._net_mcc = options.mcc if options else None
self._net_mnc = options.mnc if options else None
self._net_smsp = options.smsp if options else None
self._secret = options.secret if options else None
# Default
self._num_gen = 0
self._num_write = 0
def load(self):
# Skip if no state file
if self._filename is None:
return
# Skip if doesn't exist yet
if not os.path.isfile(self._filename):
return
# Read
fh = open(self._filename, 'r')
data = fh.read()
fh.close()
# Decode json and merge
dd = json.loads(data)
self._net_name = dd['name']
self._net_cc = dd['cc']
self._net_mcc = dd['mcc']
self._net_mnc = dd['mnc']
self._net_smsp = dd['smsp']
self._secret = dd['secret']
self._num_gen = dd['num_gen']
self._num_write = dd['num_write']
def save(self):
# Skip if no state file
if self._filename is None:
return
# Serialize
data = json.dumps({
'name': self._net_name,
'cc': self._net_cc,
'mcc': self._net_mcc,
'mnc': self._net_mnc,
'smsp': self._net_smsp,
'secret': self._secret,
'num_gen': self._num_gen,
'num_write': self._num_write,
})
# Save in json
fh = open(self._filename, 'w')
fh.write(data)
fh.close()
@property
def network(self):
return NetworkParameters(
self._net_name,
self._net_cc,
self._net_mcc,
self._net_mnc,
self._net_smsp,
)
def get_secret(self):
return self._secret
def next_gen_num(self):
n = self._num_gen
self._num_gen += 1
return n
def next_write_num(self):
n = self._num_write
self._num_write += 1
return n
#
# Card parameters generation
#
class CardParametersGenerator(object):
def __init__(self, cc, mcc, mnc, secret):
# Digitize country code (2 or 3 digits)
self._cc_digits = ('%03d' if cc > 100 else '%02d') % cc
# Digitize MCC/MNC (5 or 6 digits)
self._plmn_digits = ('%03d%03d' if mnc > 100 else '%03d%02d') % (mcc, mnc)
# Store secret
self._secret = secret
def _digits(self, usage, len_, num):
s = hashlib.sha1(self._secret + usage + '%d' % num)
d = ''.join(['%02d'%ord(x) for x in s.digest()])
return d[0:len_]
def _gen_iccid(self, num):
iccid = (
'89' + # Common prefix (telecom)
self._cc_digits + # Country Code on 2/3 digits
self._plmn_digits # MCC/MNC on 5/6 digits
)
ml = 20 - len(iccid)
iccid += self._digits('ccid', ml, num)
return iccid
def _gen_imsi(self, num):
ml = 15 - len(self._plmn_digits)
msin = self._digits('imsi', ml, num)
return (
self._plmn_digits + # MCC/MNC on 5/6 digits
msin # MSIN
)
def _gen_ki(self):
return ''.join(['%02x' % random.randrange(0,256) for i in range(16)])
def generate(self, num):
return CardParameters(
num,
self._gen_iccid(num),
self._gen_imsi(num),
self._gen_ki(),
)
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