mirror of https://gerrit.osmocom.org/pysim
Add support for encoding/decoding SMS in TPDU and SMPP format
This is important when talking OTA with a SIM. Change-Id: I0d95e62c1e7183a7851d1fe38df0f5133830cb1f
This commit is contained in:
parent
7e55569f3a
commit
0b32725f80
361
pySim/sms.py
361
pySim/sms.py
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@ -18,20 +18,25 @@
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import typing
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from construct import Int8ub, Bytes
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from construct import Struct, Tell, this, RepeatUntil
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import abc
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from bidict import bidict
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from construct import Int8ub, Byte, Bytes, Bit, Flag, BitsInteger, Flag
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from construct import Struct, Enum, Tell, BitStruct, this, Padding
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from construct import Prefixed, GreedyRange, GreedyBytes
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from pySim.construct import HexAdapter, BcdAdapter, TonNpi
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from pySim.utils import Hexstr, h2b, b2h
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from smpp.pdu import pdu_types, operations
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BytesOrHex = typing.Union[Hexstr, bytes]
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class UserDataHeader:
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# a single IE in the user data header
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ie_c = Struct('offset'/Tell, 'iei'/Int8ub, 'length'/Int8ub, 'data'/Bytes(this.length))
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ie_c = Struct('iei'/Int8ub, 'length'/Int8ub, 'value'/Bytes(this.length))
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# parser for the full UDH: Length octet followed by sequence of IEs
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_construct = Struct('udhl'/Int8ub,
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# FIXME: somehow the below lambda is not working, we always only get the first IE?
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'ies'/RepeatUntil(lambda obj,lst,ctx: ctx._io.tell() > 1+this.udhl, ie_c))
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_construct = Struct('ies'/Prefixed(Int8ub, GreedyRange(ie_c)),
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'data'/GreedyBytes)
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def __init__(self, ies=[]):
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self.ies = ies
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@ -50,4 +55,346 @@ class UserDataHeader:
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if isinstance(inb, str):
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inb = h2b(inb)
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res = cls._construct.parse(inb)
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return cls(res['ies']), inb[1+res['udhl']:]
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return cls(res['ies']), res['data']
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def toBytes(self) -> bytes:
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return self._construct.build({'ies':self.ies, 'data':b''})
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def smpp_dcs_is_8bit(dcs: pdu_types.DataCoding) -> bool:
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"""Determine if the given SMPP data coding scheme is 8-bit or not."""
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if dcs == pdu_types.DataCoding(pdu_types.DataCodingScheme.DEFAULT,
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pdu_types.DataCodingDefault.OCTET_UNSPECIFIED):
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return True
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if dcs == pdu_types.DataCoding(pdu_types.DataCodingScheme.DEFAULT,
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pdu_types.DataCodingDefault.OCTET_UNSPECIFIED_COMMON):
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return True
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if dcs.scheme == pdu_types.DataCodingScheme.GSM_MESSAGE_CLASS and dcs.schemeData['msgCoding'] == pdu_types.DataCodingGsmMsgCoding.DATA_8BIT:
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return True
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else:
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return False
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def ensure_smpp_is_8bit(dcs: pdu_types.DataCoding):
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"""Assert if given SMPP data coding scheme is not 8-bit."""
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if not smpp_dcs_is_8bit(dcs):
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raise ValueError('We only support 8bit coded SMS for now')
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class AddressField:
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"""Representation of an address field as used in SMS T-PDU."""
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_construct = Struct('addr_len'/Int8ub,
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'type_of_addr'/TonNpi,
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'digits'/BcdAdapter(Bytes(this.addr_len//2 + this.addr_len%2)),
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'tell'/Tell)
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smpp_map_npi = bidict({
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'UNKNOWN': 'unknown',
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'ISDN': 'isdn_e164',
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'DATA': 'data_x121',
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'TELEX': 'telex_f69',
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'LAND_MOBILE': 'sc_specific6',
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'NATIONAL': 'national',
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'PRIVATE': 'private',
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'ERMES': 'ermes',
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})
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smpp_map_ton = bidict({
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'UNKNOWN': 'unknown',
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'INTERNATIONAL': 'international',
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'NATIONAL': 'national',
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'NETWORK_SPECIFIC': 'network_specific',
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'SUBSCRIBER_NUMBER': 'short_code',
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'ALPHANUMERIC': 'alphanumeric',
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'ABBREVIATED': 'abbreviated',
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})
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def __init__(self, digits, ton='unknown', npi='unknown'):
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self.ton = ton
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self.npi = npi
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self.digits = digits
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def __str__(self):
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return 'AddressField(TON=%s, NPI=%s, %s)' % (self.ton, self.npi, self.digits)
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@classmethod
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def fromBytes(cls, inb: BytesOrHex) -> typing.Tuple['AddressField', bytes]:
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"""Construct an AddressField instance from the binary T-PDU address format."""
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if isinstance(inb, str):
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inb = h2b(inb)
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res = cls._construct.parse(inb)
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#print("size: %s" % cls._construct.sizeof())
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ton = res['type_of_addr']['type_of_number']
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npi = res['type_of_addr']['numbering_plan_id']
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# return resulting instance + remainder bytes
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return cls(res['digits'][:res['addr_len']], ton, npi), inb[res['tell']:]
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@classmethod
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def fromSmpp(cls, addr, ton, npi) -> 'AddressField':
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"""Construct an AddressField from {source,dest}_addr_{,ton,npi} attributes of smpp.pdu."""
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# return the resulting instance
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return cls(addr.decode('ascii'), AddressField.smpp_map_ton[ton.name], AddressField.smpp_map_npi[npi.name])
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def toSmpp(self):
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"""Return smpp.pdo.*.source,dest}_addr_{,ton,npi} attributes for given AddressField."""
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return (self.digits, self.smpp_map_ton.inverse[self.ton], self.smpp_map_npi.inverse[self.npi])
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def toBytes(self) -> bytes:
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"""Encode the AddressField into the binary representation as used in T-PDU."""
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num_digits = len(self.digits)
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if num_digits % 2:
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self.digits += 'f'
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d = {
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'addr_len': num_digits,
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'type_of_addr': {
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'ext': True,
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'type_of_number': self.ton,
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'numbering_plan_id': self.npi,
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},
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'digits': self.digits,
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}
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return self._construct.build(d)
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class SMS_TPDU(abc.ABC):
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"""Base class for a SMS T-PDU."""
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def __init__(self, **kwargs):
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self.tp_mti = kwargs.get('tp_mti', None)
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self.tp_rp = kwargs.get('tp_rp', False)
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self.tp_udhi = kwargs.get('tp_udhi', False)
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self.tp_pid = kwargs.get('tp_pid', None)
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self.tp_dcs = kwargs.get('tp_dcs', None)
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self.tp_udl = kwargs.get('tp_udl', None)
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self.tp_ud = kwargs.get('tp_ud', None)
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class SMS_DELIVER(SMS_TPDU):
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"""Representation of a SMS-DELIVER T-PDU. This is the Network to MS/UE (downlink) direction."""
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flags_construct = BitStruct('tp_rp'/Flag, 'tp_udhi'/Flag, 'tp_rp'/Flag, 'tp_sri'/Flag,
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Padding(1), 'tp_mms'/Flag, 'tp_mti'/BitsInteger(2))
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def __init__(self, **kwargs):
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kwargs['tp_mti'] = 0
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super().__init__(**kwargs)
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self.tp_lp = kwargs.get('tp_lp', False)
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self.tp_mms = kwargs.get('tp_mms', False)
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self.tp_oa = kwargs.get('tp_oa', None)
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self.tp_scts = kwargs.get('tp_scts', None)
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self.tp_sri = kwargs.get('tp_sri', False)
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def __repr__(self):
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return '%s(MTI=%s, MMS=%s, LP=%s, RP=%s, UDHI=%s, SRI=%s, OA=%s, PID=%2x, DCS=%x, SCTS=%s, UDL=%u, UD=%s)' % (self.__class__.__name__, self.tp_mti, self.tp_mms, self.tp_lp, self.tp_rp, self.tp_udhi, self.tp_sri, self.tp_oa, self.tp_pid, self.tp_dcs, self.tp_scts, self.tp_udl, self.tp_ud)
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@classmethod
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def fromBytes(cls, inb: BytesOrHex) -> 'SMS_DELIVER':
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"""Construct a SMS_DELIVER instance from the binary encoded format as used in T-PDU."""
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if isinstance(inb, str):
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inb = h2b(inb)
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flags = inb[0]
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d = SMS_DELIVER.flags_construct.parse(inb)
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oa, remainder = AddressField.fromBytes(inb[1:])
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d['tp_oa'] = oa
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offset = 0
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d['tp_pid'] = remainder[offset]
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offset += 1
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d['tp_dcs'] = remainder[offset]
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offset += 1
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# TODO: further decode
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d['tp_scts'] = remainder[offset:offset+7]
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offset += 7
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d['tp_udl'] = remainder[offset]
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offset += 1
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d['tp_ud'] = remainder[offset:]
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return cls(**d)
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def toBytes(self) -> bytes:
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"""Encode a SMS_DELIVER instance to the binary encoded format as used in T-PDU."""
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outb = bytearray()
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d = {
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'tp_mti': self.tp_mti, 'tp_mms': self.tp_mms, 'tp_lp': self.tp_lp,
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'tp_rp': self.tp_rp, 'tp_udhi': self.tp_udhi, 'tp_sri': self.tp_sri,
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}
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flags = SMS_DELIVER.flags_construct.build(d)
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outb.extend(flags)
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outb.extend(self.tp_oa.toBytes())
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outb.append(self.tp_pid)
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outb.append(self.tp_dcs)
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outb.extend(self.tp_scts)
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outb.append(self.tp_udl)
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outb.extend(self.tp_ud)
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return outb
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@classmethod
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def fromSmpp(cls, smpp_pdu) -> 'SMS_DELIVER':
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"""Construct a SMS_DELIVER instance from the deliver format used by smpp.pdu."""
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if smpp_pdu.id == pdu_types.CommandId.submit_sm:
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return cls.fromSmppSubmit(smpp_pdu)
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else:
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raise ValueError('Unsupported SMPP commandId %s' % smpp_pdu.id)
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@classmethod
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def fromSmppSubmit(cls, smpp_pdu) -> 'SMS_DELIVER':
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"""Construct a SMS_DELIVER instance from the submit format used by smpp.pdu."""
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ensure_smpp_is_8bit(smpp_pdu.params['data_coding'])
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tp_oa = AddressField.fromSmpp(smpp_pdu.params['source_addr'],
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smpp_pdu.params['source_addr_ton'],
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smpp_pdu.params['source_addr_npi'])
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tp_ud = smpp_pdu.params['short_message']
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d = {
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'tp_lp': False,
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'tp_mms': False,
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'tp_oa': tp_oa,
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'tp_scts': h2b('22705200000000'), # FIXME
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'tp_sri': False,
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'tp_rp': False,
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'tp_udhi': pdu_types.EsmClassGsmFeatures.UDHI_INDICATOR_SET in smpp_pdu.params['esm_class'].gsmFeatures,
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'tp_pid': smpp_pdu.params['protocol_id'],
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'tp_dcs': 0xF6, # we only deal with binary SMS here
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'tp_udl': len(tp_ud),
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'tp_ud': tp_ud,
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}
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return cls(**d)
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class SMS_SUBMIT(SMS_TPDU):
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"""Representation of a SMS-SUBMIT T-PDU. This is the MS/UE -> network (uplink) direction."""
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flags_construct = BitStruct('tp_srr'/Flag, 'tp_udhi'/Flag, 'tp_rp'/Flag,
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'tp_vpf'/Enum(BitsInteger(2), none=0, relative=2, enhanced=1, absolute=3),
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'tp_rd'/Flag, 'tp_mti'/BitsInteger(2))
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def __init__(self, **kwargs):
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kwargs['tp_mti'] = 1
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super().__init__(**kwargs)
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self.tp_rd = kwargs.get('tp_rd', False)
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self.tp_vpf = kwargs.get('tp_vpf', 'none')
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self.tp_srr = kwargs.get('tp_srr', False)
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self.tp_mr = kwargs.get('tp_mr', None)
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self.tp_da = kwargs.get('tp_da', None)
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self.tp_vp = kwargs.get('tp_vp', None)
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def __repr__(self):
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return '%s(MTI=%s, RD=%s, VPF=%u, RP=%s, UDHI=%s, SRR=%s, DA=%s, PID=%2x, DCS=%x, VP=%s, UDL=%u, UD=%s)' % (self.__class__.__name__, self.tp_mti, self.tp_rd, self.tp_vpf, self.tp_rp, self.tp_udhi, self.tp_srr, self.tp_da, self.tp_pid, self.tp_dcs, self.tp_vp, self.tp_udl, self.tp_ud)
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@classmethod
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def fromBytes(cls, inb:BytesOrHex) -> 'SMS_SUBMIT':
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"""Construct a SMS_SUBMIT instance from the binary encoded format as used in T-PDU."""
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offset = 0
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if isinstance(inb, str):
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inb = h2b(inb)
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d = SMS_SUBMIT.flags_construct.parse(inb)
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offset += 1
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d['tp_mr']= inb[offset]
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offset += 1
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da, remainder = AddressField.fromBytes(inb[2:])
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d['tp_da'] = da
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offset = 0
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d['tp_pid'] = remainder[offset]
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offset += 1
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d['tp_dcs'] = remainder[offset]
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offset += 1
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if d['tp_vpf'] == 'none':
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pass
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elif d['tp_vpf'] == 'relative':
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# TODO: further decode
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d['tp_vp'] = remainder[offset:offset+1]
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offset += 1
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elif d['tp_vpf'] == 'enhanced':
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# TODO: further decode
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d['tp_vp'] = remainder[offset:offset+7]
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offset += 7
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pass
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elif d['tp_vpf'] == 'absolute':
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# TODO: further decode
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d['tp_vp'] = remainder[offset:offset+7]
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offset += 7
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pass
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else:
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raise ValueError('Invalid VPF: %s' % d['tp_vpf'])
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d['tp_udl'] = remainder[offset]
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offset += 1
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d['tp_ud'] = remainder[offset:]
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return cls(**d)
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def toBytes(self) -> bytes:
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"""Encode a SMS_SUBMIT instance to the binary encoded format as used in T-PDU."""
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outb = bytearray()
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d = {
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'tp_mti': self.tp_mti, 'tp_rd': self.tp_rd, 'tp_vpf': self.tp_vpf,
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'tp_rp': self.tp_rp, 'tp_udhi': self.tp_udhi, 'tp_srr': self.tp_srr,
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}
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flags = SMS_SUBMIT.flags_construct.build(d)
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outb.extend(flags)
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outb.append(self.tp_mr)
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outb.extend(self.tp_da.toBytes())
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outb.append(self.tp_pid)
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outb.append(self.tp_dcs)
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if self.tp_vpf != 'none':
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outb.extend(self.tp_vp)
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outb.append(self.tp_udl)
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outb.extend(self.tp_ud)
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return outb
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@classmethod
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def fromSmpp(cls, smpp_pdu) -> 'SMS_SUBMIT':
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"""Construct a SMS_SUBMIT instance from the format used by smpp.pdu."""
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if smpp_pdu.id == pdu_types.CommandId.submit_sm:
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return cls.fromSmppSubmit(smpp_pdu)
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else:
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raise ValueError('Unsupported SMPP commandId %s' % smpp_pdu.id)
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@classmethod
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def fromSmppSubmit(cls, smpp_pdu) -> 'SMS_SUBMIT':
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"""Construct a SMS_SUBMIT instance from the submit format used by smpp.pdu."""
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ensure_smpp_is_8bit(smpp_pdu.params['data_coding'])
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tp_da = AddressField.fromSmpp(smpp_pdu.params['destination_addr'],
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smpp_pdu.params['dest_addr_ton'],
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smpp_pdu.params['dest_addr_npi'])
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tp_ud = smpp_pdu.params['short_message']
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#vp_smpp = smpp_pdu.params['validity_period']
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#if not vp_smpp:
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# vpf = 'none'
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d = {
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'tp_rd': True if smpp_pdu.params['replace_if_present_flag'].name == 'REPLACE' else False,
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'tp_vpf': None, # vpf,
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'tp_rp': False, # related to ['registered_delivery'] ?
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'tp_udhi': pdu_types.EsmClassGsmFeatures.UDHI_INDICATOR_SET in smpp_pdu.params['esm_class'].gsmFeatures,
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'tp_srr': True if smpp_pdu.params['registered_delivery'] else False,
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'tp_mr': 0, # FIXME: sm_default_msg_id ?
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'tp_da': tp_da,
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'tp_pid': smpp_pdu.params['protocol_id'],
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'tp_dcs': 0xF6, # FIXME: we only deal with binary SMS here
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'tp_vp': None, # FIXME: implement VPF conversion
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'tp_udl': len(tp_ud),
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'tp_ud': tp_ud,
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}
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return cls(**d)
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def toSmpp(self) -> pdu_types.PDU:
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"""Translate a SMS_SUBMIT instance to a smpp.pdu.operations.SubmitSM instance."""
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esm_class = pdu_types.EsmClass(pdu_types.EsmClassMode.DEFAULT, pdu_types.EsmClassType.DEFAULT)
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reg_del = pdu_types.RegisteredDelivery(pdu_types.RegisteredDeliveryReceipt.NO_SMSC_DELIVERY_RECEIPT_REQUESTED)
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if self.tp_rp:
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repl_if = pdu_types.ReplaceIfPresentFlag.REPLACE
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else:
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repl_if = pdu_types.ReplaceIfPresentFlag.DO_NOT_REPLACE
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# we only deal with binary SMS here:
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if self.tp_dcs != 0xF6:
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raise ValueError('Unsupported DCS: We only support DCS=0xF6 for now')
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dc = pdu_types.DataCoding(pdu_types.DataCodingScheme.DEFAULT, pdu_types.DataCodingDefault.OCTET_UNSPECIFIED)
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(daddr, ton, npi) = self.tp_da.toSmpp()
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return operations.SubmitSM(service_type='',
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source_addr_ton=pdu_types.AddrTon.ALPHANUMERIC,
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source_addr_npi=pdu_types.AddrNpi.UNKNOWN,
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source_addr='simcard',
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dest_addr_ton=ton,
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dest_addr_npi=npi,
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destination_addr=daddr,
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esm_class=esm_class,
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protocol_id=self.tp_pid,
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priority_flag=pdu_types.PriorityFlag.LEVEL_0,
|
||||
#schedule_delivery_time,
|
||||
#validity_period,
|
||||
registered_delivery=reg_del,
|
||||
replace_if_present_flag=repl_if,
|
||||
data_coding=dc,
|
||||
#sm_default_msg_id,
|
||||
short_message=self.tp_ud)
|
||||
|
|
|
|||
|
|
@ -11,3 +11,4 @@ termcolor
|
|||
colorlog
|
||||
pycryptodomex
|
||||
packaging
|
||||
git+https://github.com/hologram-io/smpp.pdu
|
||||
|
|
|
|||
1
setup.py
1
setup.py
|
|
@ -22,6 +22,7 @@ setup(
|
|||
"colorlog",
|
||||
"pycryptodomex",
|
||||
"packaging",
|
||||
"smpp.pdu @ git+https://github.com/hologram-io/smpp.pdu",
|
||||
],
|
||||
scripts=[
|
||||
'pySim-prog.py',
|
||||
|
|
|
|||
|
|
@ -0,0 +1,105 @@
|
|||
#!/usr/bin/env python3
|
||||
|
||||
import unittest
|
||||
from pySim.utils import h2b, b2h
|
||||
from pySim.sms import *
|
||||
|
||||
class Test_SMS_UDH(unittest.TestCase):
|
||||
def test_single_ie(self):
|
||||
udh, tail = UserDataHeader.fromBytes('027100')
|
||||
self.assertEqual(len(udh.ies), 1)
|
||||
ie = udh.ies[0]
|
||||
self.assertEqual(ie.iei, 0x71)
|
||||
self.assertEqual(ie.length, 0)
|
||||
self.assertEqual(ie.value, b'')
|
||||
self.assertEqual(tail, b'')
|
||||
|
||||
def test_single_ie_tail(self):
|
||||
udh, tail = UserDataHeader.fromBytes('027100abcdef')
|
||||
self.assertEqual(len(udh.ies), 1)
|
||||
ie = udh.ies[0]
|
||||
self.assertEqual(ie.iei, 0x71)
|
||||
self.assertEqual(ie.length, 0)
|
||||
self.assertEqual(ie.value, b'')
|
||||
self.assertEqual(tail, b'\xab\xcd\xef')
|
||||
|
||||
def test_single_ie_value(self):
|
||||
udh, tail = UserDataHeader.fromBytes('03710110')
|
||||
self.assertEqual(len(udh.ies), 1)
|
||||
ie = udh.ies[0]
|
||||
self.assertEqual(ie.iei, 0x71)
|
||||
self.assertEqual(ie.length, 1)
|
||||
self.assertEqual(ie.value, b'\x10')
|
||||
self.assertEqual(tail, b'')
|
||||
|
||||
def test_two_ie_data_tail(self):
|
||||
udh, tail = UserDataHeader.fromBytes('0571007001ffabcd')
|
||||
self.assertEqual(len(udh.ies), 2)
|
||||
ie = udh.ies[0]
|
||||
self.assertEqual(ie.iei, 0x71)
|
||||
self.assertEqual(ie.length, 0)
|
||||
self.assertEqual(ie.value, b'')
|
||||
ie = udh.ies[1]
|
||||
self.assertEqual(ie.iei, 0x70)
|
||||
self.assertEqual(ie.length, 1)
|
||||
self.assertEqual(ie.value, b'\xff')
|
||||
self.assertEqual(tail, b'\xab\xcd')
|
||||
|
||||
def test_toBytes(self):
|
||||
indata = h2b('0571007001ff')
|
||||
udh, tail = UserDataHeader.fromBytes(indata)
|
||||
encoded = udh.toBytes()
|
||||
self.assertEqual(encoded, indata)
|
||||
|
||||
class Test_AddressField(unittest.TestCase):
|
||||
def test_fromBytes(self):
|
||||
encoded = h2b('0480214399')
|
||||
af, trailer = AddressField.fromBytes(encoded)
|
||||
self.assertEqual(trailer, b'\x99')
|
||||
self.assertEqual(af.ton, 'unknown')
|
||||
self.assertEqual(af.npi, 'unknown')
|
||||
self.assertEqual(af.digits, '1234')
|
||||
|
||||
def test_fromBytes_odd(self):
|
||||
af, trailer = AddressField.fromBytes('038021f399')
|
||||
self.assertEqual(trailer, b'\x99')
|
||||
self.assertEqual(af.ton, 'unknown')
|
||||
self.assertEqual(af.npi, 'unknown')
|
||||
self.assertEqual(af.digits, '123')
|
||||
|
||||
def test_toBytes(self):
|
||||
encoded = h2b('04802143')
|
||||
af, trailer = AddressField.fromBytes(encoded)
|
||||
self.assertEqual(af.toBytes(), encoded)
|
||||
|
||||
def test_toBytes_odd(self):
|
||||
af = AddressField('12345', 'international', 'isdn_e164')
|
||||
encoded = af.toBytes()
|
||||
self.assertEqual(encoded, h2b('05912143f5'))
|
||||
|
||||
|
||||
class Test_SUBMIT(unittest.TestCase):
|
||||
def test_fromBytes(self):
|
||||
s = SMS_SUBMIT.fromBytes('550d0b911614261771f000f5a78c0b050423f423f40003010201424547494e3a56434152440d0a56455253494f4e3a322e310d0a4e3a4d650d0a54454c3b505245463b43454c4c3b564f4943453a2b36313431363237313137300d0a54454c3b484f4d453b564f4943453a2b36313339353337303437310d0a54454c3b574f524b3b564f4943453a2b36313339363734373031350d0a454e443a')
|
||||
self.assertEqual(s.tp_mti, 1)
|
||||
self.assertEqual(s.tp_rd, True)
|
||||
self.assertEqual(s.tp_vpf, 'relative')
|
||||
self.assertEqual(s.tp_rp, False)
|
||||
self.assertEqual(s.tp_udhi, True)
|
||||
self.assertEqual(s.tp_srr, False)
|
||||
self.assertEqual(s.tp_pid, 0)
|
||||
self.assertEqual(s.tp_dcs, 0xf5)
|
||||
self.assertEqual(s.tp_udl, 140)
|
||||
|
||||
class Test_DELIVER(unittest.TestCase):
|
||||
def test_fromBytes(self):
|
||||
d = SMS_DELIVER.fromBytes('0408D0E5759A0E7FF6907090307513000824010101BB400101')
|
||||
self.assertEqual(d.tp_mti, 0)
|
||||
self.assertEqual(d.tp_mms, True)
|
||||
self.assertEqual(d.tp_lp, False)
|
||||
self.assertEqual(d.tp_rp, False)
|
||||
self.assertEqual(d.tp_udhi, False)
|
||||
self.assertEqual(d.tp_sri, False)
|
||||
self.assertEqual(d.tp_pid, 0x7f)
|
||||
self.assertEqual(d.tp_dcs, 0xf6)
|
||||
self.assertEqual(d.tp_udl, 8)
|
||||
Loading…
Reference in New Issue