Max | 6882313 | 2016-11-15 19:10:05 +0100 | [diff] [blame] | 1 | #!/usr/bin/python3 |
| 2 | # -*- mode: python-mode; py-indent-tabs-mode: nil -*- |
| 3 | """ |
| 4 | /* |
| 5 | * Copyright (C) 2016 sysmocom s.f.m.c. GmbH |
| 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | */ |
| 23 | """ |
| 24 | |
| 25 | from ipa import Ctrl, IPA |
| 26 | from twisted.internet.protocol import ReconnectingClientFactory |
| 27 | from twisted.internet import reactor |
| 28 | from twisted.protocols import basic |
| 29 | import argparse |
| 30 | |
| 31 | class IPACommon(basic.Int16StringReceiver): |
| 32 | """ |
| 33 | Generic IPA protocol handler: include some routines for simpler subprotocols. |
| 34 | It's not intended as full implementation of all subprotocols, rather common ground and example code. |
| 35 | """ |
| 36 | def dbg(self, line): |
| 37 | """ |
| 38 | Debug print helper |
| 39 | """ |
| 40 | if self.factory.debug: |
| 41 | print(line) |
| 42 | |
| 43 | def osmo_CTRL(self, data): |
| 44 | """ |
| 45 | OSMO CTRL protocol |
| 46 | Placeholder, see corresponding derived class |
| 47 | """ |
| 48 | pass |
| 49 | |
| 50 | def osmo_MGCP(self, data): |
| 51 | """ |
| 52 | OSMO MGCP extension |
| 53 | """ |
| 54 | self.dbg('OSMO MGCP received %s' % data) |
| 55 | |
| 56 | def osmo_LAC(self, data): |
| 57 | """ |
| 58 | OSMO LAC extension |
| 59 | """ |
| 60 | self.dbg('OSMO LAC received %s' % data) |
| 61 | |
| 62 | def osmo_SMSC(self, data): |
| 63 | """ |
| 64 | OSMO SMSC extension |
| 65 | """ |
| 66 | self.dbg('OSMO SMSC received %s' % data) |
| 67 | |
| 68 | def osmo_ORC(self, data): |
| 69 | """ |
| 70 | OSMO ORC extension |
| 71 | """ |
| 72 | self.dbg('OSMO ORC received %s' % data) |
| 73 | |
| 74 | def osmo_GSUP(self, data): |
| 75 | """ |
| 76 | OSMO GSUP extension |
| 77 | """ |
| 78 | self.dbg('OSMO GSUP received %s' % data) |
| 79 | |
| 80 | def osmo_OAP(self, data): |
| 81 | """ |
| 82 | OSMO OAP extension |
| 83 | """ |
| 84 | self.dbg('OSMO OAP received %s' % data) |
| 85 | |
| 86 | def osmo_UNKNOWN(self, data): |
| 87 | """ |
| 88 | OSMO defaul extension handler |
| 89 | """ |
| 90 | self.dbg('OSMO unknown extension received %s' % data) |
| 91 | |
| 92 | def handle_RSL(self, data, proto, extension): |
| 93 | """ |
| 94 | RSL protocol handler |
| 95 | """ |
| 96 | self.dbg('IPA RSL received message with extension %s' % extension) |
| 97 | |
| 98 | def handle_CCM(self, data, proto, msgt): |
| 99 | """ |
| 100 | CCM (IPA Connection Management) |
| 101 | Placeholder, see corresponding derived class |
| 102 | """ |
| 103 | pass |
| 104 | |
| 105 | def handle_SCCP(self, data, proto, extension): |
| 106 | """ |
| 107 | SCCP protocol handler |
| 108 | """ |
| 109 | self.dbg('IPA SCCP received message with extension %s' % extension) |
| 110 | |
| 111 | def handle_OML(self, data, proto, extension): |
| 112 | """ |
| 113 | OML protocol handler |
| 114 | """ |
| 115 | self.dbg('IPA OML received message with extension %s' % extension) |
| 116 | |
| 117 | def handle_OSMO(self, data, proto, extension): |
| 118 | """ |
| 119 | Dispatcher point for OSMO subprotocols based on extension name, lambda default should never happen |
| 120 | """ |
| 121 | method = getattr(self, 'osmo_' + IPA().ext(extension), lambda: "extension dispatch failure") |
| 122 | method(data) |
| 123 | |
| 124 | def handle_MGCP(self, data, proto, extension): |
| 125 | """ |
| 126 | MGCP protocol handler |
| 127 | """ |
| 128 | self.dbg('IPA MGCP received message with attribute %s' % extension) |
| 129 | |
| 130 | def handle_UNKNOWN(self, data, proto, extension): |
| 131 | """ |
| 132 | Default protocol handler |
| 133 | """ |
| 134 | self.dbg('IPA received message for %s (%s) protocol with attribute %s' % (IPA().proto(proto), proto, extension)) |
| 135 | |
| 136 | def process_chunk(self, data): |
| 137 | """ |
| 138 | Generic message dispatcher for IPA (sub)protocols based on protocol name, lambda default should never happen |
| 139 | """ |
| 140 | (_, proto, extension, content) = IPA().del_header(data) |
| 141 | if content is not None: |
| 142 | self.dbg('IPA received %s::%s [%d/%d] %s' % (IPA().proto(proto), IPA().ext_name(proto, extension), len(data), len(content), content)) |
| 143 | method = getattr(self, 'handle_' + IPA().proto(proto), lambda: "protocol dispatch failure") |
| 144 | method(content, proto, extension) |
| 145 | |
| 146 | def dataReceived(self, data): |
| 147 | """ |
| 148 | Override for dataReceived from Int16StringReceiver because of inherently incompatible interpretation of length |
| 149 | If default handler is used than we would always get off-by-1 error (Int16StringReceiver use equivalent of l + 2) |
| 150 | """ |
| 151 | if len(data): |
| 152 | (head, tail) = IPA().split_combined(data) |
| 153 | self.process_chunk(head) |
| 154 | self.dataReceived(tail) |
| 155 | |
| 156 | def connectionMade(self): |
| 157 | """ |
| 158 | We have to resetDelay() here to drop internal state to default values to make reconnection logic work |
| 159 | Make sure to call this via super() if overriding to keep reconnection logic intact |
| 160 | """ |
| 161 | self.dbg('IPA connection made!') |
| 162 | self.factory.resetDelay() |
| 163 | |
| 164 | |
| 165 | class CCM(IPACommon): |
| 166 | """ |
| 167 | Implementation of CCM protocol for IPA multiplex |
| 168 | """ |
| 169 | def ack(self): |
| 170 | self.transport.write(IPA().id_ack()) |
| 171 | |
| 172 | def ping(self): |
| 173 | self.transport.write(IPA().ping()) |
| 174 | |
| 175 | def pong(self): |
| 176 | self.transport.write(IPA().pong()) |
| 177 | |
| 178 | def handle_CCM(self, data, proto, msgt): |
| 179 | """ |
| 180 | CCM (IPA Connection Management) |
| 181 | Only basic logic necessary for tests is implemented (ping-pong, id ack etc) |
| 182 | """ |
| 183 | if msgt == IPA.MSGT['ID_GET']: |
| 184 | self.transport.getHandle().sendall(IPA().id_resp(self.factory.ccm_id)) |
| 185 | # if we call |
| 186 | # self.transport.write(IPA().id_resp(self.factory.test_id)) |
| 187 | # instead, than we would have to also call |
| 188 | # reactor.callLater(1, self.ack) |
| 189 | # instead of self.ack() |
| 190 | # otherwise the writes will be glued together - hence the necessity for ugly hack with 1s timeout |
| 191 | # Note: this still might work depending on the IPA implementation details on the other side |
| 192 | self.ack() |
| 193 | # schedule PING in 4s |
| 194 | reactor.callLater(4, self.ping) |
| 195 | if msgt == IPA.MSGT['PING']: |
| 196 | self.pong() |
| 197 | |
| 198 | |
| 199 | class CTRL(IPACommon): |
| 200 | """ |
| 201 | Implementation of Osmocom control protocol for IPA multiplex |
| 202 | """ |
| 203 | def ctrl_SET(self, data, op_id, v): |
| 204 | """ |
| 205 | Handle CTRL SET command |
| 206 | """ |
| 207 | self.dbg('CTRL SET [%s] %s' % (op_id, v)) |
| 208 | |
| 209 | def ctrl_SET_REPLY(self, data, op_id, v): |
| 210 | """ |
| 211 | Handle CTRL SET reply |
| 212 | """ |
| 213 | self.dbg('CTRL SET REPLY [%s] %s' % (op_id, v)) |
| 214 | |
| 215 | def ctrl_GET(self, data, op_id, v): |
| 216 | """ |
| 217 | Handle CTRL GET command |
| 218 | """ |
| 219 | self.dbg('CTRL GET [%s] %s' % (op_id, v)) |
| 220 | |
| 221 | def ctrl_GET_REPLY(self, data, op_id, v): |
| 222 | """ |
| 223 | Handle CTRL GET reply |
| 224 | """ |
| 225 | self.dbg('CTRL GET REPLY [%s] %s' % (op_id, v)) |
| 226 | |
| 227 | def ctrl_TRAP(self, data, op_id, v): |
| 228 | """ |
| 229 | Handle CTRL TRAP command |
| 230 | """ |
| 231 | self.dbg('CTRL TRAP [%s] %s' % (op_id, v)) |
| 232 | |
| 233 | def ctrl_ERROR(self, data, op_id, v): |
| 234 | """ |
| 235 | Handle CTRL ERROR reply |
| 236 | """ |
| 237 | self.dbg('CTRL ERROR [%s] %s' % (op_id, v)) |
| 238 | |
| 239 | def osmo_CTRL(self, data): |
| 240 | """ |
| 241 | OSMO CTRL message dispatcher, lambda default should never happen |
| 242 | For basic tests only, appropriate handling routines should be replaced: see CtrlServer for example |
| 243 | """ |
| 244 | self.dbg('OSMO CTRL received %s::%s' % Ctrl().parse(data.decode('utf-8'))) |
| 245 | (cmd, op_id, v) = data.decode('utf-8').split(' ', 2) |
| 246 | method = getattr(self, 'ctrl_' + cmd, lambda: "CTRL unknown command") |
| 247 | method(data, op_id, v) |
| 248 | |
| 249 | |
| 250 | class IPAServer(CCM): |
| 251 | """ |
| 252 | Test implementation of IPA server |
| 253 | Demonstrate CCM opearation by overriding necessary bits from CCM |
| 254 | """ |
| 255 | def connectionMade(self): |
| 256 | """ |
| 257 | Keep reconnection logic working by calling routine from CCM |
| 258 | Initiate CCM upon connection |
| 259 | """ |
| 260 | print('IPA server connection made!') |
| 261 | super(IPAServer, self).connectionMade() |
| 262 | self.transport.write(IPA().id_get()) |
| 263 | |
| 264 | |
| 265 | class CtrlServer(CTRL): |
| 266 | """ |
| 267 | Test implementation of CTRL server |
| 268 | Demonstarte CTRL handling by overriding simpler routines from CTRL |
| 269 | """ |
| 270 | def connectionMade(self): |
| 271 | """ |
| 272 | Keep reconnection logic working by calling routine from CTRL |
| 273 | Send TRAP upon connection |
| 274 | Note: we can't use sendString() because of it's incompatibility with IPA interpretation of length prefix |
| 275 | """ |
| 276 | print('CTRL server connection made!') |
| 277 | super(CtrlServer, self).connectionMade() |
| 278 | self.transport.write(Ctrl().trap('LOL', 'what')) |
| 279 | self.transport.write(Ctrl().trap('rulez', 'XXX')) |
| 280 | |
| 281 | def reply(self, r): |
| 282 | self.transport.write(Ctrl().add_header(r)) |
| 283 | |
| 284 | def ctrl_SET(self, data, op_id, v): |
| 285 | """ |
| 286 | CTRL SET command: always succeed |
| 287 | """ |
| 288 | print('SET [%s] %s' % (op_id, v)) |
| 289 | self.reply('SET_REPLY %s %s' % (op_id, v)) |
| 290 | |
| 291 | def ctrl_GET(self, data, op_id, v): |
| 292 | """ |
| 293 | CTRL GET command: always fail |
| 294 | """ |
| 295 | print('GET [%s] %s' % (op_id, v)) |
| 296 | self.reply('ERROR %s No variable found' % op_id) |
| 297 | |
| 298 | |
| 299 | class IPAFactory(ReconnectingClientFactory): |
| 300 | """ |
| 301 | Generic IPA Client Factory which can be used to store state for various subprotocols and manage connections |
| 302 | Note: so far we do not really need separate Factory for acting as a server due to protocol simplicity |
| 303 | """ |
| 304 | protocol = IPACommon |
| 305 | debug = False |
| 306 | ccm_id = IPA().identity(unit=b'1515/0/1', mac=b'b0:0b:fa:ce:de:ad:be:ef', utype=b'sysmoBTS', name=b'StingRay', location=b'hell', sw=IPA.version.encode('utf-8')) |
| 307 | |
| 308 | def __init__(self, proto=None, debug=False, ccm_id=None): |
| 309 | if proto: |
| 310 | self.protocol = proto |
| 311 | if debug: |
| 312 | self.debug = debug |
| 313 | if ccm_id: |
| 314 | self.ccm_id = ccm_id |
| 315 | |
| 316 | def clientConnectionFailed(self, connector, reason): |
| 317 | """ |
| 318 | Only necessary for as debugging aid - if we can somehow set parent's class noisy attribute then we can omit this method |
| 319 | """ |
| 320 | if self.debug: |
| 321 | print('IPAFactory connection failed:', reason.getErrorMessage()) |
| 322 | ReconnectingClientFactory.clientConnectionFailed(self, connector, reason) |
| 323 | |
| 324 | def clientConnectionLost(self, connector, reason): |
| 325 | """ |
| 326 | Only necessary for as debugging aid - if we can somehow set parent's class noisy attribute then we can omit this method |
| 327 | """ |
| 328 | if self.debug: |
| 329 | print('IPAFactory connection lost:', reason.getErrorMessage()) |
| 330 | ReconnectingClientFactory.clientConnectionLost(self, connector, reason) |
| 331 | |
| 332 | |
| 333 | if __name__ == '__main__': |
| 334 | p = argparse.ArgumentParser("Twisted IPA (module v%s) app" % IPA.version) |
| 335 | p.add_argument('-v', '--version', action='version', version='%(prog)s v0.3') |
| 336 | p.add_argument('-p', '--port', type=int, default=4250, help="Port to use for CTRL interface") |
| 337 | p.add_argument('-d', '--host', default='localhost', help="Adress to use for CTRL interface") |
| 338 | cs = p.add_mutually_exclusive_group() |
| 339 | cs.add_argument("-c", "--client", action='store_true', help="asume client role") |
| 340 | cs.add_argument("-s", "--server", action='store_true', help="asume server role") |
| 341 | ic = p.add_mutually_exclusive_group() |
| 342 | ic.add_argument("--ipa", action='store_true', help="use IPA protocol") |
| 343 | ic.add_argument("--ctrl", action='store_true', help="use CTRL protocol") |
| 344 | args = p.parse_args() |
| 345 | test = False |
| 346 | if args.ctrl: |
| 347 | if args.client: |
| 348 | # Start osmo-bsc to receive TRAP messages when osmo-bts-* connects to it |
| 349 | print('CTRL client, connecting to %s:%d' % (args.host, args.port)) |
| 350 | reactor.connectTCP(args.host, args.port, IPAFactory(CTRL, debug=True)) |
| 351 | test = True |
| 352 | if args.server: |
| 353 | # Use bsc_control.py to issue set/get commands |
| 354 | print('CTRL server, listening on port %d' % args.port) |
| 355 | reactor.listenTCP(args.port, IPAFactory(CtrlServer, debug=True)) |
| 356 | test = True |
| 357 | if args.ipa: |
| 358 | if args.client: |
| 359 | # Start osmo-nitb which would initiate A-bis/IP session |
| 360 | print('IPA client, connecting to %s ports %d and %d' % (args.host, IPA.TCP_PORT_OML, IPA.TCP_PORT_RSL)) |
| 361 | reactor.connectTCP(args.host, IPA.TCP_PORT_OML, IPAFactory(CCM, debug=True)) |
| 362 | reactor.connectTCP(args.host, IPA.TCP_PORT_RSL, IPAFactory(CCM, debug=True)) |
| 363 | test = True |
| 364 | if args.server: |
| 365 | # Start osmo-bts-* which would attempt to connect to us |
| 366 | print('IPA server, listening on ports %d and %d' % (IPA.TCP_PORT_OML, IPA.TCP_PORT_RSL)) |
| 367 | reactor.listenTCP(IPA.TCP_PORT_RSL, IPAFactory(IPAServer, debug=True)) |
| 368 | reactor.listenTCP(IPA.TCP_PORT_OML, IPAFactory(IPAServer, debug=True)) |
| 369 | test = True |
| 370 | if test: |
| 371 | reactor.run() |
| 372 | else: |
| 373 | print("Please specify which protocol in which role you'd like to test.") |