| #!/usr/bin/env python |
| # -*- coding: utf-8 -*- |
| |
| """ pySim: various utilities |
| """ |
| |
| # |
| # Copyright (C) 2009-2010 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/>. |
| # |
| |
| |
| def h2b(s): |
| return ''.join([chr((int(x,16)<<4)+int(y,16)) for x,y in zip(s[0::2], s[1::2])]) |
| |
| def b2h(s): |
| return ''.join(['%02x'%ord(x) for x in s]) |
| |
| def h2i(s): |
| return [(int(x,16)<<4)+int(y,16) for x,y in zip(s[0::2], s[1::2])] |
| |
| def i2h(s): |
| return ''.join(['%02x'%(x) for x in s]) |
| |
| def h2s(s): |
| return ''.join([chr((int(x,16)<<4)+int(y,16)) for x,y in zip(s[0::2], s[1::2]) |
| if int(x + y, 16) != 0xff]) |
| |
| def s2h(s): |
| return b2h(s) |
| |
| # List of bytes to string |
| def i2s(s): |
| return ''.join([chr(x) for x in s]) |
| |
| def swap_nibbles(s): |
| return ''.join([x+y for x,y in zip(s[1::2], s[0::2])]) |
| |
| def rpad(s, l, c='f'): |
| return s + c * (l - len(s)) |
| |
| def lpad(s, l, c='f'): |
| return c * (l - len(s)) + s |
| |
| def half_round_up(n): |
| return (n + 1)//2 |
| |
| # IMSI encoded format: |
| # For IMSI 0123456789ABCDE: |
| # |
| # | byte 1 | 2 upper | 2 lower | 3 upper | 3 lower | ... | 9 upper | 9 lower | |
| # | length in bytes | 0 | odd/even | 2 | 1 | ... | E | D | |
| # |
| # If the IMSI is less than 15 characters, it should be padded with 'f' from the end. |
| # |
| # The length is the total number of bytes used to encoded the IMSI. This includes the odd/even |
| # parity bit. E.g. an IMSI of length 14 is 8 bytes long, not 7, as it uses bytes 2 to 9 to |
| # encode itself. |
| # |
| # Because of this, an odd length IMSI fits exactly into len(imsi) + 1 // 2 bytes, whereas an |
| # even length IMSI only uses half of the last byte. |
| |
| def enc_imsi(imsi): |
| """Converts a string imsi into the value of the EF""" |
| l = half_round_up(len(imsi) + 1) # Required bytes - include space for odd/even indicator |
| oe = len(imsi) & 1 # Odd (1) / Even (0) |
| ei = '%02x' % l + swap_nibbles('%01x%s' % ((oe<<3)|1, rpad(imsi, 15))) |
| return ei |
| |
| def dec_imsi(ef): |
| """Converts an EF value to the imsi string representation""" |
| if len(ef) < 4: |
| return None |
| l = int(ef[0:2], 16) * 2 # Length of the IMSI string |
| l = l - 1 # Encoded length byte includes oe nibble |
| swapped = swap_nibbles(ef[2:]).rstrip('f') |
| if len(swapped) < 1: |
| return None |
| oe = (int(swapped[0])>>3) & 1 # Odd (1) / Even (0) |
| if not oe: |
| # if even, only half of last byte was used |
| l = l-1 |
| if l != len(swapped) - 1: |
| return None |
| imsi = swapped[1:] |
| return imsi |
| |
| def dec_iccid(ef): |
| return swap_nibbles(ef).strip('f') |
| |
| def enc_iccid(iccid): |
| return swap_nibbles(rpad(iccid, 20)) |
| |
| def enc_plmn(mcc, mnc): |
| """Converts integer MCC/MNC into 3 bytes for EF""" |
| if len(mnc) == 2: |
| mnc = "F%s" % mnc |
| return swap_nibbles("%s%s" % (mcc, mnc)) |
| |
| def dec_spn(ef): |
| byte1 = int(ef[0:2]) |
| hplmn_disp = (byte1&0x01 == 0x01) |
| oplmn_disp = (byte1&0x02 == 0x02) |
| name = h2s(ef[2:]) |
| return (name, hplmn_disp, oplmn_disp) |
| |
| def enc_spn(name, hplmn_disp=False, oplmn_disp=False): |
| byte1 = 0x00 |
| if hplmn_disp: byte1 = byte1|0x01 |
| if oplmn_disp: byte1 = byte1|0x02 |
| return i2h([byte1])+s2h(name) |
| |
| def hexstr_to_Nbytearr(s, nbytes): |
| return [s[i:i+(nbytes*2)] for i in range(0, len(s), (nbytes*2)) ] |
| |
| # Accepts hex string representing three bytes |
| def dec_mcc_from_plmn(plmn): |
| ia = h2i(plmn) |
| digit1 = ia[0] & 0x0F # 1st byte, LSB |
| digit2 = (ia[0] & 0xF0) >> 4 # 1st byte, MSB |
| digit3 = ia[1] & 0x0F # 2nd byte, LSB |
| if digit3 == 0xF and digit2 == 0xF and digit1 == 0xF: |
| return 0xFFF # 4095 |
| return derive_mcc(digit1, digit2, digit3) |
| |
| def dec_mnc_from_plmn(plmn): |
| ia = h2i(plmn) |
| digit1 = ia[2] & 0x0F # 3rd byte, LSB |
| digit2 = (ia[2] & 0xF0) >> 4 # 3rd byte, MSB |
| digit3 = (ia[1] & 0xF0) >> 4 # 2nd byte, MSB |
| if digit3 == 0xF and digit2 == 0xF and digit1 == 0xF: |
| return 0xFFF # 4095 |
| return derive_mnc(digit1, digit2, digit3) |
| |
| def dec_act(twohexbytes): |
| act_list = [ |
| {'bit': 15, 'name': "UTRAN"}, |
| {'bit': 14, 'name': "E-UTRAN"}, |
| {'bit': 7, 'name': "GSM"}, |
| {'bit': 6, 'name': "GSM COMPACT"}, |
| {'bit': 5, 'name': "cdma2000 HRPD"}, |
| {'bit': 4, 'name': "cdma2000 1xRTT"}, |
| ] |
| ia = h2i(twohexbytes) |
| u16t = (ia[0] << 8)|ia[1] |
| sel = [] |
| for a in act_list: |
| if u16t & (1 << a['bit']): |
| sel.append(a['name']) |
| return sel |
| |
| def dec_xplmn_w_act(fivehexbytes): |
| res = {'mcc': 0, 'mnc': 0, 'act': []} |
| plmn_chars = 6 |
| act_chars = 4 |
| plmn_str = fivehexbytes[:plmn_chars] # first three bytes (six ascii hex chars) |
| act_str = fivehexbytes[plmn_chars:plmn_chars + act_chars] # two bytes after first three bytes |
| res['mcc'] = dec_mcc_from_plmn(plmn_str) |
| res['mnc'] = dec_mnc_from_plmn(plmn_str) |
| res['act'] = dec_act(act_str) |
| return res |
| |
| def format_xplmn_w_act(hexstr): |
| s = "" |
| for rec_data in hexstr_to_Nbytearr(hexstr, 5): |
| rec_info = dec_xplmn_w_act(rec_data) |
| if rec_info['mcc'] == 0xFFF and rec_info['mnc'] == 0xFFF: |
| rec_str = "unused" |
| else: |
| rec_str = "MCC: %03d MNC: %03d AcT: %s" % (rec_info['mcc'], rec_info['mnc'], ", ".join(rec_info['act'])) |
| s += "\t%s # %s\n" % (rec_data, rec_str) |
| return s |
| |
| def dec_loci(hexstr): |
| res = {'tmsi': '', 'mcc': 0, 'mnc': 0, 'lac': '', 'status': 0} |
| res['tmsi'] = hexstr[:8] |
| res['mcc'] = dec_mcc_from_plmn(hexstr[8:14]) |
| res['mnc'] = dec_mnc_from_plmn(hexstr[8:14]) |
| res['lac'] = hexstr[14:18] |
| res['status'] = h2i(hexstr[20:22]) |
| return res |
| |
| def dec_psloci(hexstr): |
| res = {'p-tmsi': '', 'p-tmsi-sig': '', 'mcc': 0, 'mnc': 0, 'lac': '', 'rac': '', 'status': 0} |
| res['p-tmsi'] = hexstr[:8] |
| res['p-tmsi-sig'] = hexstr[8:14] |
| res['mcc'] = dec_mcc_from_plmn(hexstr[14:20]) |
| res['mnc'] = dec_mnc_from_plmn(hexstr[14:20]) |
| res['lac'] = hexstr[20:24] |
| res['rac'] = hexstr[24:26] |
| res['status'] = h2i(hexstr[26:28]) |
| return res |
| |
| def dec_epsloci(hexstr): |
| res = {'guti': '', 'mcc': 0, 'mnc': 0, 'tac': '', 'status': 0} |
| res['guti'] = hexstr[:24] |
| res['tai'] = hexstr[24:34] |
| res['mcc'] = dec_mcc_from_plmn(hexstr[24:30]) |
| res['mnc'] = dec_mnc_from_plmn(hexstr[24:30]) |
| res['tac'] = hexstr[30:34] |
| res['status'] = h2i(hexstr[34:36]) |
| return res |
| |
| def dec_xplmn(threehexbytes): |
| res = {'mcc': 0, 'mnc': 0, 'act': []} |
| plmn_chars = 6 |
| plmn_str = threehexbytes[:plmn_chars] # first three bytes (six ascii hex chars) |
| res['mcc'] = dec_mcc_from_plmn(plmn_str) |
| res['mnc'] = dec_mnc_from_plmn(plmn_str) |
| return res |
| |
| def format_xplmn(hexstr): |
| s = "" |
| for rec_data in hexstr_to_Nbytearr(hexstr, 3): |
| rec_info = dec_xplmn(rec_data) |
| if rec_info['mcc'] == 0xFFF and rec_info['mnc'] == 0xFFF: |
| rec_str = "unused" |
| else: |
| rec_str = "MCC: %03d MNC: %03d" % (rec_info['mcc'], rec_info['mnc']) |
| s += "\t%s # %s\n" % (rec_data, rec_str) |
| return s |
| |
| def derive_milenage_opc(ki_hex, op_hex): |
| """ |
| Run the milenage algorithm to calculate OPC from Ki and OP |
| """ |
| from Crypto.Cipher import AES |
| from Crypto.Util.strxor import strxor |
| from pySim.utils import b2h |
| |
| # We pass in hex string and now need to work on bytes |
| aes = AES.new(h2b(ki_hex)) |
| opc_bytes = aes.encrypt(h2b(op_hex)) |
| return b2h(strxor(opc_bytes, h2b(op_hex))) |
| |
| def calculate_luhn(cc): |
| """ |
| Calculate Luhn checksum used in e.g. ICCID and IMEI |
| """ |
| num = list(map(int, str(cc))) |
| check_digit = 10 - sum(num[-2::-2] + [sum(divmod(d * 2, 10)) for d in num[::-2]]) % 10 |
| return 0 if check_digit == 10 else check_digit |
| |
| def mcc_from_imsi(imsi): |
| """ |
| Derive the MCC (Mobile Country Code) from the first three digits of an IMSI |
| """ |
| if imsi == None: |
| return None |
| |
| if len(imsi) > 3: |
| return imsi[:3] |
| else: |
| return None |
| |
| def mnc_from_imsi(imsi, long=False): |
| """ |
| Derive the MNC (Mobile Country Code) from the 4th to 6th digit of an IMSI |
| """ |
| if imsi == None: |
| return None |
| |
| if len(imsi) > 3: |
| if long: |
| return imsi[3:6] |
| else: |
| return imsi[3:5] |
| else: |
| return None |
| |
| def derive_mcc(digit1, digit2, digit3): |
| """ |
| Derive decimal representation of the MCC (Mobile Country Code) |
| from three given digits. |
| """ |
| |
| mcc = 0 |
| |
| if digit1 != 0x0f: |
| mcc += digit1 * 100 |
| if digit2 != 0x0f: |
| mcc += digit2 * 10 |
| if digit3 != 0x0f: |
| mcc += digit3 |
| |
| return mcc |
| |
| def derive_mnc(digit1, digit2, digit3=0x0f): |
| """ |
| Derive decimal representation of the MNC (Mobile Network Code) |
| from two or (optionally) three given digits. |
| """ |
| |
| mnc = 0 |
| |
| # 3-rd digit is optional for the MNC. If present |
| # the algorythm is the same as for the MCC. |
| if digit3 != 0x0f: |
| return derive_mcc(digit1, digit2, digit3) |
| |
| if digit1 != 0x0f: |
| mnc += digit1 * 10 |
| if digit2 != 0x0f: |
| mnc += digit2 |
| |
| return mnc |
| |
| def dec_msisdn(ef_msisdn): |
| """ |
| Decode MSISDN from EF.MSISDN or EF.ADN (same structure). |
| See 3GPP TS 31.102, section 4.2.26 and 4.4.2.3. |
| """ |
| |
| # Convert from str to (kind of) 'bytes' |
| ef_msisdn = h2b(ef_msisdn) |
| |
| # Make sure mandatory fields are present |
| if len(ef_msisdn) < 14: |
| raise ValueError("EF.MSISDN is too short") |
| |
| # Skip optional Alpha Identifier |
| xlen = len(ef_msisdn) - 14 |
| msisdn_lhv = ef_msisdn[xlen:] |
| |
| # Parse the length (in bytes) of the BCD encoded number |
| bcd_len = ord(msisdn_lhv[0]) |
| # BCD length = length of dial num (max. 10 bytes) + 1 byte ToN and NPI |
| if bcd_len == 0xff: |
| return None |
| elif bcd_len > 11 or bcd_len < 1: |
| raise ValueError("Length of MSISDN (%d bytes) is out of range" % bcd_len) |
| |
| # Parse ToN / NPI |
| ton = (ord(msisdn_lhv[1]) >> 4) & 0x07 |
| npi = ord(msisdn_lhv[1]) & 0x0f |
| bcd_len -= 1 |
| |
| # No MSISDN? |
| if not bcd_len: |
| return (npi, ton, None) |
| |
| msisdn = swap_nibbles(b2h(msisdn_lhv[2:][:bcd_len])).rstrip('f') |
| # International number 10.5.118/3GPP TS 24.008 |
| if ton == 0x01: |
| msisdn = '+' + msisdn |
| |
| return (npi, ton, msisdn) |
| |
| def enc_msisdn(msisdn, npi=0x01, ton=0x03): |
| """ |
| Encode MSISDN as LHV so it can be stored to EF.MSISDN. |
| See 3GPP TS 31.102, section 4.2.26 and 4.4.2.3. |
| |
| Default NPI / ToN values: |
| - NPI: ISDN / telephony numbering plan (E.164 / E.163), |
| - ToN: network specific or international number (if starts with '+'). |
| """ |
| |
| # Leading '+' indicates International Number |
| if msisdn[0] == '+': |
| msisdn = msisdn[1:] |
| ton = 0x01 |
| |
| # Append 'f' padding if number of digits is odd |
| if len(msisdn) % 2 > 0: |
| msisdn += 'f' |
| |
| # BCD length also includes NPI/ToN header |
| bcd_len = len(msisdn) // 2 + 1 |
| npi_ton = (npi & 0x0f) | ((ton & 0x07) << 4) | 0x80 |
| bcd = rpad(swap_nibbles(msisdn), 10 * 2) # pad to 10 octets |
| |
| return ('%02x' % bcd_len) + ('%02x' % npi_ton) + bcd |
| |
| def dec_st(st, table="sim"): |
| """ |
| Parses the EF S/U/IST and prints the list of available services in EF S/U/IST |
| """ |
| |
| if table == "isim": |
| from pySim.ts_31_103 import EF_IST_map |
| lookup_map = EF_IST_map |
| elif table == "usim": |
| from pySim.ts_31_102 import EF_UST_map |
| lookup_map = EF_UST_map |
| else: |
| from pySim.ts_51_011 import EF_SST_map |
| lookup_map = EF_SST_map |
| |
| st_bytes = [st[i:i+2] for i in range(0, len(st), 2) ] |
| |
| avail_st = "" |
| # Get each byte and check for available services |
| for i in range(0, len(st_bytes)): |
| # Byte i contains info about Services num (8i+1) to num (8i+8) |
| byte = int(st_bytes[i], 16) |
| # Services in each byte are in order MSB to LSB |
| # MSB - Service (8i+8) |
| # LSB - Service (8i+1) |
| for j in range(1, 9): |
| if byte&0x01 == 0x01 and ((8*i) + j in lookup_map): |
| # Byte X contains info about Services num (8X-7) to num (8X) |
| # bit = 1: service available |
| # bit = 0: service not available |
| avail_st += '\tService %d - %s\n' % ((8*i) + j, lookup_map[(8*i) + j]) |
| byte = byte >> 1 |
| return avail_st |
| |
| def first_TLV_parser(bytelist): |
| ''' |
| first_TLV_parser([0xAA, 0x02, 0xAB, 0xCD, 0xFF, 0x00]) -> (170, 2, [171, 205]) |
| |
| parses first TLV format record in a list of bytelist |
| returns a 3-Tuple: Tag, Length, Value |
| Value is a list of bytes |
| parsing of length is ETSI'style 101.220 |
| ''' |
| Tag = bytelist[0] |
| if bytelist[1] == 0xFF: |
| Len = bytelist[2]*256 + bytelist[3] |
| Val = bytelist[4:4+Len] |
| else: |
| Len = bytelist[1] |
| Val = bytelist[2:2+Len] |
| return (Tag, Len, Val) |
| |
| def TLV_parser(bytelist): |
| ''' |
| TLV_parser([0xAA, ..., 0xFF]) -> [(T, L, [V]), (T, L, [V]), ...] |
| |
| loops on the input list of bytes with the "first_TLV_parser()" function |
| returns a list of 3-Tuples |
| ''' |
| ret = [] |
| while len(bytelist) > 0: |
| T, L, V = first_TLV_parser(bytelist) |
| if T == 0xFF: |
| # padding bytes |
| break |
| ret.append( (T, L, V) ) |
| # need to manage length of L |
| if L > 0xFE: |
| bytelist = bytelist[ L+4 : ] |
| else: |
| bytelist = bytelist[ L+2 : ] |
| return ret |
| |
| def enc_st(st, service, state=1): |
| """ |
| Encodes the EF S/U/IST/EST and returns the updated Service Table |
| |
| Parameters: |
| st - Current value of SIM/USIM/ISIM Service Table |
| service - Service Number to encode as activated/de-activated |
| state - 1 mean activate, 0 means de-activate |
| |
| Returns: |
| s - Modified value of SIM/USIM/ISIM Service Table |
| |
| Default values: |
| - state: 1 - Sets the particular Service bit to 1 |
| """ |
| st_bytes = [st[i:i+2] for i in range(0, len(st), 2) ] |
| |
| s = "" |
| # Check whether the requested service is present in each byte |
| for i in range(0, len(st_bytes)): |
| # Byte i contains info about Services num (8i+1) to num (8i+8) |
| if service in range((8*i) + 1, (8*i) + 9): |
| byte = int(st_bytes[i], 16) |
| # Services in each byte are in order MSB to LSB |
| # MSB - Service (8i+8) |
| # LSB - Service (8i+1) |
| mod_byte = 0x00 |
| # Copy bit by bit contents of byte to mod_byte with modified bit |
| # for requested service |
| for j in range(1, 9): |
| mod_byte = mod_byte >> 1 |
| if service == (8*i) + j: |
| mod_byte = state == 1 and mod_byte|0x80 or mod_byte&0x7f |
| else: |
| mod_byte = byte&0x01 == 0x01 and mod_byte|0x80 or mod_byte&0x7f |
| byte = byte >> 1 |
| |
| s += ('%02x' % (mod_byte)) |
| else: |
| s += st_bytes[i] |
| |
| return s |
| |
| def dec_addr_tlv(hexstr): |
| """ |
| Decode hex string to get EF.P-CSCF Address or EF.ePDGId or EF.ePDGIdEm. |
| See 3GPP TS 31.102 version 13.4.0 Release 13, section 4.2.8, 4.2.102 and 4.2.104. |
| """ |
| |
| # Convert from hex str to int bytes list |
| addr_tlv_bytes = h2i(hexstr) |
| |
| s = "" |
| |
| # Get list of tuples containing parsed TLVs |
| tlvs = TLV_parser(addr_tlv_bytes) |
| |
| for tlv in tlvs: |
| # tlv = (T, L, [V]) |
| # T = Tag |
| # L = Length |
| # [V] = List of value |
| |
| # Invalid Tag value scenario |
| if tlv[0] != 0x80: |
| continue |
| |
| # Empty field - Zero length |
| if tlv[1] == 0: |
| continue |
| |
| # First byte in the value has the address type |
| addr_type = tlv[2][0] |
| # TODO: Support parsing of IPv4 and IPv6 |
| # Address Type: 0x00 (FQDN), 0x01 (IPv4), 0x02 (IPv6), other (Reserved) |
| if addr_type == 0x00: #FQDN |
| # Skip address tye byte i.e. first byte in value list |
| content = tlv[2][1:] |
| s += "\t%s # %s\n" % (i2h(content), i2s(content)) |
| |
| return s |
| |
| def enc_addr_tlv(addr, addr_type='00'): |
| """ |
| Encode address TLV object used in EF.P-CSCF Address, EF.ePDGId and EF.ePDGIdEm. |
| See 3GPP TS 31.102 version 13.4.0 Release 13, section 4.2.8, 4.2.102 and 4.2.104. |
| |
| Default values: |
| - addr_type: 00 - FQDN format of Address |
| """ |
| |
| s = "" |
| |
| # TODO: Encoding of IPv4 and IPv6 address |
| if addr_type == '00': |
| hex_str = s2h(addr) |
| s += '80' + ('%02x' % ((len(hex_str)//2)+1)) + '00' + hex_str |
| |
| return s |
| |
| def sanitize_pin_adm(opts): |
| """ |
| The ADM pin can be supplied either in its hexadecimal form or as |
| ascii string. This function checks the supplied opts parameter and |
| returns the pin_adm as hex encoded string, regardles in which form |
| it was originally supplied by the user |
| """ |
| |
| pin_adm = None |
| |
| if opts.pin_adm is not None: |
| if len(opts.pin_adm) <= 8: |
| pin_adm = ''.join(['%02x'%(ord(x)) for x in opts.pin_adm]) |
| pin_adm = rpad(pin_adm, 16) |
| |
| else: |
| raise ValueError("PIN-ADM needs to be <=8 digits (ascii)") |
| |
| if opts.pin_adm_hex is not None: |
| if len(opts.pin_adm_hex) == 16: |
| pin_adm = opts.pin_adm_hex |
| # Ensure that it's hex-encoded |
| try: |
| try_encode = h2b(pin_adm) |
| except ValueError: |
| raise ValueError("PIN-ADM needs to be hex encoded using this option") |
| else: |
| raise ValueError("PIN-ADM needs to be exactly 16 digits (hex encoded)") |
| |
| return pin_adm |
| |
| def init_reader(opts): |
| """ |
| Init card reader driver |
| """ |
| if opts.pcsc_dev is not None: |
| print("Using PC/SC reader interface") |
| from pySim.transport.pcsc import PcscSimLink |
| sl = PcscSimLink(opts.pcsc_dev) |
| elif opts.osmocon_sock is not None: |
| print("Using Calypso-based (OsmocomBB) reader interface") |
| from pySim.transport.calypso import CalypsoSimLink |
| sl = CalypsoSimLink(sock_path=opts.osmocon_sock) |
| elif opts.modem_dev is not None: |
| print("Using modem for Generic SIM Access (3GPP TS 27.007)") |
| from pySim.transport.modem_atcmd import ModemATCommandLink |
| sl = ModemATCommandLink(device=opts.modem_dev, baudrate=opts.modem_baud) |
| else: # Serial reader is default |
| print("Using serial reader interface") |
| from pySim.transport.serial import SerialSimLink |
| sl = SerialSimLink(device=opts.device, baudrate=opts.baudrate) |
| |
| return sl |
| |
| def enc_ePDGSelection(hexstr, mcc, mnc, epdg_priority='0001', epdg_fqdn_format='00'): |
| """ |
| Encode ePDGSelection so it can be stored at EF.ePDGSelection or EF.ePDGSelectionEm. |
| See 3GPP TS 31.102 version 15.2.0 Release 15, section 4.2.104 and 4.2.106. |
| |
| Default values: |
| - epdg_priority: '0001' - 1st Priority |
| - epdg_fqdn_format: '00' - Operator Identifier FQDN |
| """ |
| |
| plmn1 = enc_plmn(mcc, mnc) + epdg_priority + epdg_fqdn_format |
| # TODO: Handle encoding of Length field for length more than 127 Bytes |
| content = '80' + ('%02x' % (len(plmn1)//2)) + plmn1 |
| content = rpad(content, len(hexstr)) |
| return content |
| |
| def dec_ePDGSelection(sixhexbytes): |
| """ |
| Decode ePDGSelection to get EF.ePDGSelection or EF.ePDGSelectionEm. |
| See 3GPP TS 31.102 version 15.2.0 Release 15, section 4.2.104 and 4.2.106. |
| """ |
| |
| res = {'mcc': 0, 'mnc': 0, 'epdg_priority': 0, 'epdg_fqdn_format': ''} |
| plmn_chars = 6 |
| epdg_priority_chars = 4 |
| epdg_fqdn_format_chars = 2 |
| # first three bytes (six ascii hex chars) |
| plmn_str = sixhexbytes[:plmn_chars] |
| # two bytes after first three bytes |
| epdg_priority_str = sixhexbytes[plmn_chars:plmn_chars + epdg_priority_chars] |
| # one byte after first five bytes |
| epdg_fqdn_format_str = sixhexbytes[plmn_chars + epdg_priority_chars:plmn_chars + epdg_priority_chars + epdg_fqdn_format_chars] |
| res['mcc'] = dec_mcc_from_plmn(plmn_str) |
| res['mnc'] = dec_mnc_from_plmn(plmn_str) |
| res['epdg_priority'] = epdg_priority_str |
| res['epdg_fqdn_format'] = epdg_fqdn_format_str == '00' and 'Operator Identifier FQDN' or 'Location based FQDN' |
| return res |
| |
| def format_ePDGSelection(hexstr): |
| ePDGSelection_info_tag_chars = 2 |
| ePDGSelection_info_tag_str = hexstr[:2] |
| s = "" |
| # Minimum length |
| len_chars = 2 |
| # TODO: Need to determine length properly - definite length support only |
| # Inconsistency in spec: 3GPP TS 31.102 version 15.2.0 Release 15, 4.2.104 |
| # As per spec, length is 5n, n - number of PLMNs |
| # But, each PLMN entry is made of PLMN (3 Bytes) + ePDG Priority (2 Bytes) + ePDG FQDN format (1 Byte) |
| # Totalling to 6 Bytes, maybe length should be 6n |
| len_str = hexstr[ePDGSelection_info_tag_chars:ePDGSelection_info_tag_chars+len_chars] |
| |
| # Not programmed scenario |
| if int(len_str, 16) == 255 or int(ePDGSelection_info_tag_str, 16) == 255: |
| len_chars = 0 |
| ePDGSelection_info_tag_chars = 0 |
| if len_str[0] == '8': |
| # The bits 7 to 1 denotes the number of length octets if length > 127 |
| if int(len_str[1]) > 0: |
| # Update number of length octets |
| len_chars = len_chars * int(len_str[1]) |
| len_str = hexstr[ePDGSelection_info_tag_chars:len_chars] |
| |
| content_str = hexstr[ePDGSelection_info_tag_chars+len_chars:] |
| # Right pad to prevent index out of range - multiple of 6 bytes |
| content_str = rpad(content_str, len(content_str) + (12 - (len(content_str) % 12))) |
| for rec_data in hexstr_to_Nbytearr(content_str, 6): |
| rec_info = dec_ePDGSelection(rec_data) |
| if rec_info['mcc'] == 0xFFF and rec_info['mnc'] == 0xFFF: |
| rec_str = "unused" |
| else: |
| rec_str = "MCC: %03d MNC: %03d ePDG Priority: %s ePDG FQDN format: %s" % \ |
| (rec_info['mcc'], rec_info['mnc'], rec_info['epdg_priority'], rec_info['epdg_fqdn_format']) |
| s += "\t%s # %s\n" % (rec_data, rec_str) |
| return s |