301 lines
9.6 KiB
Python
Executable File
301 lines
9.6 KiB
Python
Executable File
#!/usr/bin/python3
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# -*- mode: python-mode; py-indent-tabs-mode: nil -*-
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"""
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/*
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* Copyright (C) 2016 sysmocom s.f.m.c. GmbH
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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"""
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import struct, random, sys
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class IPA(object):
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"""
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Stateless IPA protocol multiplexer: add/remove/parse (extended) header
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"""
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version = "0.0.6"
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TCP_PORT_OML = 3002
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TCP_PORT_RSL = 3003
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# OpenBSC extensions: OSMO, MGCP_OLD
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PROTO = dict(RSL=0x00, CCM=0xFE, SCCP=0xFD, OML=0xFF, OSMO=0xEE, MGCP_OLD=0xFC)
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# ...OML Router Control, GSUP GPRS extension, Osmocom Authn Protocol
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EXT = dict(CTRL=0, MGCP=1, LAC=2, SMSC=3, ORC=4, GSUP=5, OAP=6, RSPRO=7)
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# OpenBSC extension: SCCP_OLD
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MSGT = dict(PING=0x00, PONG=0x01, ID_GET=0x04, ID_RESP=0x05, ID_ACK=0x06, SCCP_OLD=0xFF)
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_IDTAG = dict(SERNR=0, UNITNAME=1, LOCATION=2, TYPE=3, EQUIPVERS=4, SWVERSION=5, IPADDR=6, MACADDR=7, UNIT=8)
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CTRL_GET = 'GET'
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CTRL_SET = 'SET'
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CTRL_REP = 'REPLY'
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CTRL_ERR = 'ERR'
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CTRL_TRAP = 'TRAP'
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CTRL_TRAP_ID = 0
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def _l(self, d, p):
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"""
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Reverse dictionary lookup: return key for a given value
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"""
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if p is None:
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return 'UNKNOWN'
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return list(d.keys())[list(d.values()).index(p)]
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def _tag(self, t, v):
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"""
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Create TAG as TLV data
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"""
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return struct.pack(">HB", len(v) + 1, t) + v
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def proto(self, p):
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"""
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Lookup protocol name
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"""
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return self._l(self.PROTO, p)
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def ext(self, p):
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"""
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Lookup protocol extension name
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"""
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return self._l(self.EXT, p)
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def msgt(self, p):
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"""
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Lookup message type name
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"""
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return self._l(self.MSGT, p)
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def idtag(self, p):
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"""
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Lookup ID tag name
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"""
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return self._l(self._IDTAG, p)
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def ext_name(self, proto, exten):
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"""
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Return proper extension byte name depending on the protocol used
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"""
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if self.PROTO['CCM'] == proto:
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return self.msgt(exten)
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if self.PROTO['OSMO'] == proto:
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return self.ext(exten)
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return None
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def add_header(self, data, proto, ext=None):
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"""
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Add IPA header (with extension if necessary), data must be represented as bytes
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"""
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if ext is None:
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return struct.pack(">HB", len(data) + 1, proto) + data
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return struct.pack(">HBB", len(data) + 1, proto, ext) + data
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def del_header(self, data):
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"""
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Strip IPA protocol header correctly removing extension if present
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Returns data length, IPA protocol, extension (or None if not defined for a give protocol) and the data without header
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"""
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if not len(data):
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return None, None, None, None
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(dlen, proto) = struct.unpack('>HB', data[:3])
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if self.PROTO['OSMO'] == proto or self.PROTO['CCM'] == proto: # there's extension which we have to unpack
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return struct.unpack('>HBB', data[:4]) + (data[4:], ) # length, protocol, extension, data
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return dlen, proto, None, data[3:] # length, protocol, _, data
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def split_combined(self, data):
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"""
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Split the data which contains multiple concatenated IPA messages into tuple (first, rest) where rest contains remaining messages, first is the single IPA message
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"""
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(length, _, _, _) = self.del_header(data)
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return data[:(length + 3)], data[(length + 3):]
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def tag_serial(self, data):
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"""
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Make TAG for serial number
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"""
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return self._tag(self._IDTAG['SERNR'], data)
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def tag_name(self, data):
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"""
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Make TAG for unit name
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"""
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return self._tag(self._IDTAG['UNITNAME'], data)
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def tag_loc(self, data):
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"""
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Make TAG for location
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"""
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return self._tag(self._IDTAG['LOCATION'], data)
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def tag_type(self, data):
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"""
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Make TAG for unit type
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"""
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return self._tag(self._IDTAG['TYPE'], data)
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def tag_equip(self, data):
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"""
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Make TAG for equipment version
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"""
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return self._tag(self._IDTAG['EQUIPVERS'], data)
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def tag_sw(self, data):
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"""
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Make TAG for software version
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"""
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return self._tag(self._IDTAG['SWVERSION'], data)
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def tag_ip(self, data):
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"""
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Make TAG for IP address
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"""
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return self._tag(self._IDTAG['IPADDR'], data)
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def tag_mac(self, data):
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"""
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Make TAG for MAC address
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"""
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return self._tag(self._IDTAG['MACADDR'], data)
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def tag_unit(self, data):
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"""
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Make TAG for unit ID
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"""
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return self._tag(self._IDTAG['UNIT'], data)
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def identity(self, unit=b'', mac=b'', location=b'', utype=b'', equip=b'', sw=b'', name=b'', serial=b''):
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"""
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Make IPA IDENTITY tag list, by default returns empty concatenated bytes of tag list
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"""
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return self.tag_unit(unit) + self.tag_mac(mac) + self.tag_loc(location) + self.tag_type(utype) + self.tag_equip(equip) + self.tag_sw(sw) + self.tag_name(name) + self.tag_serial(serial)
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def ping(self):
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"""
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Make PING message
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"""
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return self.add_header(b'', self.PROTO['CCM'], self.MSGT['PING'])
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def pong(self):
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"""
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Make PONG message
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"""
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return self.add_header(b'', self.PROTO['CCM'], self.MSGT['PONG'])
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def id_ack(self):
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"""
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Make ID_ACK CCM message
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"""
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return self.add_header(b'', self.PROTO['CCM'], self.MSGT['ID_ACK'])
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def id_get(self):
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"""
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Make ID_GET CCM message
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"""
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return self.add_header(self.identity(), self.PROTO['CCM'], self.MSGT['ID_GET'])
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def id_resp(self, data):
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"""
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Make ID_RESP CCM message
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"""
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return self.add_header(data, self.PROTO['CCM'], self.MSGT['ID_RESP'])
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class Ctrl(IPA):
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"""
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Osmocom CTRL protocol implemented on top of IPA multiplexer
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"""
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def __init__(self):
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random.seed()
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def add_header(self, data):
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"""
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Add CTRL header
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"""
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return super(Ctrl, self).add_header(data.encode('utf-8'), IPA.PROTO['OSMO'], IPA.EXT['CTRL'])
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def rem_header(self, data):
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"""
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Remove CTRL header, check for appropriate protocol and extension
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"""
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(_, proto, ext, d) = super(Ctrl, self).del_header(data)
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if self.PROTO['OSMO'] != proto or self.EXT['CTRL'] != ext:
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return None
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return d
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def parse(self, raw_data):
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"""
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Parse Ctrl string returning (id, var, value) tuple
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var could be None in case of ERROR message
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value could be None in case of GET message
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both could be None in case of TRAP with non-zero id
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"""
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data = self.rem_header(raw_data)
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if data == None:
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return None, None, None
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data = data.decode('utf-8')
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(s, i, v) = data.split(' ', 2)
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if s == self.CTRL_ERR:
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return i, None, v
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if s == self.CTRL_GET:
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return i, v, None
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if s == self.CTRL_GET + '_' + self.CTRL_REP:
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return i, v, None
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(s, i, var, val) = data.split(' ', 3)
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if s == self.CTRL_TRAP and int(i) != self.CTRL_TRAP_ID:
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return i, None, None
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return i, var, val
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def parse_kv(self, raw_data):
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"""
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Parse Ctrl string returning (var, value) pair
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var could be None in case of ERROR message
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value could be None in case of GET message
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"""
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(i, var, val) = self.parse(raw_data)
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return var, val
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def trap(self, var, val):
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"""
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Make TRAP message with given (vak, val) pair
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"""
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return self.add_header("%s %d %s %s" % (self.CTRL_TRAP, self.CTRL_TRAP_ID, var, val))
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def cmd(self, var, val=None):
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"""
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Make SET/GET command message: returns (r, m) tuple where r is random operation id and m is assembled message
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"""
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r = random.randint(1, sys.maxsize)
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if val is not None:
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return r, self.add_header("%s %s %s %s" % (self.CTRL_SET, r, var, val))
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return r, self.add_header("%s %s %s" % (self.CTRL_GET, r, var))
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def reply(self, op_id, var, val=None):
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"""
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Make SET/GET command reply: returns assembled message
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"""
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if val is not None:
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return self.add_header("%s_%s %s %s %s" % (self.CTRL_SET, self.CTRL_REP, op_id, var, val))
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return self.add_header("%s_%s %s %s" % (self.CTRL_GET, self.CTRL_REP, op_id, var))
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def verify(self, reply, r, var, val=None):
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"""
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Verify reply to SET/GET command: returns (b, v) tuple where v is True/False verification result and v is the variable value
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"""
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(k, v) = self.parse_kv(reply)
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if k != var or (val is not None and v != val):
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return False, v
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return True, v
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if __name__ == '__main__':
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print("IPA multiplexer v%s loaded." % IPA.version)
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