| 1 | #! @PYTHON@ |
| 2 | ### -*-python-*- |
| 3 | ### |
| 4 | ### Service for automatically tracking network connection status |
| 5 | ### |
| 6 | ### (c) 2010 Straylight/Edgeware |
| 7 | ### |
| 8 | |
| 9 | ###----- Licensing notice --------------------------------------------------- |
| 10 | ### |
| 11 | ### This file is part of Trivial IP Encryption (TrIPE). |
| 12 | ### |
| 13 | ### TrIPE is free software: you can redistribute it and/or modify it under |
| 14 | ### the terms of the GNU General Public License as published by the Free |
| 15 | ### Software Foundation; either version 3 of the License, or (at your |
| 16 | ### option) any later version. |
| 17 | ### |
| 18 | ### TrIPE is distributed in the hope that it will be useful, but WITHOUT |
| 19 | ### ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 20 | ### FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 21 | ### for more details. |
| 22 | ### |
| 23 | ### You should have received a copy of the GNU General Public License |
| 24 | ### along with TrIPE. If not, see <https://www.gnu.org/licenses/>. |
| 25 | |
| 26 | VERSION = '@VERSION@' |
| 27 | |
| 28 | ###-------------------------------------------------------------------------- |
| 29 | ### External dependencies. |
| 30 | |
| 31 | from ConfigParser import RawConfigParser |
| 32 | from optparse import OptionParser |
| 33 | import os as OS |
| 34 | import sys as SYS |
| 35 | import socket as S |
| 36 | import mLib as M |
| 37 | import tripe as T |
| 38 | import dbus as D |
| 39 | import re as RX |
| 40 | for i in ['mainloop', 'mainloop.glib']: |
| 41 | __import__('dbus.%s' % i) |
| 42 | try: from gi.repository import GLib as G |
| 43 | except ImportError: import gobject as G |
| 44 | from struct import pack, unpack |
| 45 | |
| 46 | SM = T.svcmgr |
| 47 | ##__import__('rmcr').__debug = True |
| 48 | |
| 49 | ###-------------------------------------------------------------------------- |
| 50 | ### Utilities. |
| 51 | |
| 52 | class struct (object): |
| 53 | """A simple container object.""" |
| 54 | def __init__(me, **kw): |
| 55 | me.__dict__.update(kw) |
| 56 | |
| 57 | ###-------------------------------------------------------------------------- |
| 58 | ### Address manipulation. |
| 59 | |
| 60 | class InetAddress (object): |
| 61 | def __init__(me, addrstr, maskstr = None): |
| 62 | me.addr = me._addrstr_to_int(addrstr) |
| 63 | if maskstr is None: |
| 64 | me.mask = -1 |
| 65 | elif maskstr.isdigit(): |
| 66 | me.mask = (1 << 32) - (1 << 32 - int(maskstr)) |
| 67 | else: |
| 68 | me.mask = me._addrstr_to_int(maskstr) |
| 69 | if me.addr&~me.mask: |
| 70 | raise ValueError('network contains bits set beyond mask') |
| 71 | def _addrstr_to_int(me, addrstr): |
| 72 | return unpack('>L', S.inet_aton(addrstr))[0] |
| 73 | def _int_to_addrstr(me, n): |
| 74 | return S.inet_ntoa(pack('>L', n)) |
| 75 | def sockaddr(me, port = 0): |
| 76 | if me.mask != -1: raise ValueError('not a simple address') |
| 77 | return me._int_to_addrstr(me.addr), port |
| 78 | def __str__(me): |
| 79 | addrstr = me._int_to_addrstr(me.addr) |
| 80 | if me.mask == -1: |
| 81 | return addrstr |
| 82 | else: |
| 83 | inv = me.mask ^ ((1 << 32) - 1) |
| 84 | if (inv&(inv + 1)) == 0: |
| 85 | return '%s/%d' % (addrstr, 32 - inv.bit_length()) |
| 86 | else: |
| 87 | return '%s/%s' % (addrstr, me._int_to_addrstr(me.mask)) |
| 88 | def withinp(me, net): |
| 89 | if (me.mask&net.mask) != net.mask: return False |
| 90 | if (me.addr ^ net.addr)&net.mask: return False |
| 91 | return True |
| 92 | def eq(me, other): |
| 93 | if me.mask != other.mask: return False |
| 94 | if me.addr != other.addr: return False |
| 95 | return True |
| 96 | @classmethod |
| 97 | def from_sockaddr(cls, sa): |
| 98 | addr, port = (lambda a, p: (a, p))(*sa) |
| 99 | return cls(addr), port |
| 100 | |
| 101 | def parse_address(addrstr, maskstr = None): |
| 102 | return InetAddress(addrstr, maskstr) |
| 103 | |
| 104 | def parse_net(netstr): |
| 105 | try: sl = netstr.index('/') |
| 106 | except ValueError: raise ValueError('missing mask') |
| 107 | return parse_address(netstr[:sl], netstr[sl + 1:]) |
| 108 | |
| 109 | def straddr(a): return a is None and '#<none>' or str(a) |
| 110 | |
| 111 | ###-------------------------------------------------------------------------- |
| 112 | ### Parse the configuration file. |
| 113 | |
| 114 | ## Hmm. Should I try to integrate this with the peers database? It's not a |
| 115 | ## good fit; it'd need special hacks in tripe-newpeers. And the use case for |
| 116 | ## this service are largely going to be satellite notes, I don't think |
| 117 | ## scalability's going to be a problem. |
| 118 | |
| 119 | TESTADDR = InetAddress('1.2.3.4') |
| 120 | |
| 121 | CONFSYNTAX = [ |
| 122 | ('COMMENT', RX.compile(r'^\s*($|[;#])')), |
| 123 | ('GRPHDR', RX.compile(r'^\s*\[(.*)\]\s*$')), |
| 124 | ('ASSGN', RX.compile(r'\s*([\w.-]+)\s*[:=]\s*(|\S|\S.*\S)\s*$'))] |
| 125 | |
| 126 | class ConfigError (Exception): |
| 127 | def __init__(me, file, lno, msg): |
| 128 | me.file = file |
| 129 | me.lno = lno |
| 130 | me.msg = msg |
| 131 | def __str__(me): |
| 132 | return '%s:%d: %s' % (me.file, me.lno, me.msg) |
| 133 | |
| 134 | class Config (object): |
| 135 | """ |
| 136 | Represents a configuration file. |
| 137 | |
| 138 | The most interesting thing is probably the `groups' slot, which stores a |
| 139 | list of pairs (NAME, PATTERNS); the NAME is a string, and the PATTERNS a |
| 140 | list of (TAG, PEER, NET) triples. The implication is that there should be |
| 141 | precisely one peer from the set, and that it should be named TAG, where |
| 142 | (TAG, PEER, NET) is the first triple such that the host's primary IP |
| 143 | address (if PEER is None -- or the IP address it would use for |
| 144 | communicating with PEER) is within the NET. |
| 145 | """ |
| 146 | |
| 147 | def __init__(me, file): |
| 148 | """ |
| 149 | Construct a new Config object, reading the given FILE. |
| 150 | """ |
| 151 | me._file = file |
| 152 | me._fwatch = M.FWatch(file) |
| 153 | me._update() |
| 154 | |
| 155 | def check(me): |
| 156 | """ |
| 157 | See whether the configuration file has been updated. |
| 158 | """ |
| 159 | if me._fwatch.update(): |
| 160 | me._update() |
| 161 | |
| 162 | def _update(me): |
| 163 | """ |
| 164 | Internal function to update the configuration from the underlying file. |
| 165 | """ |
| 166 | |
| 167 | if T._debug: print '# reread config' |
| 168 | |
| 169 | ## Initial state. |
| 170 | testaddr = None |
| 171 | groups = {} |
| 172 | grpname = None |
| 173 | grplist = [] |
| 174 | |
| 175 | ## Open the file and start reading. |
| 176 | with open(me._file) as f: |
| 177 | lno = 0 |
| 178 | for line in f: |
| 179 | lno += 1 |
| 180 | for tag, rx in CONFSYNTAX: |
| 181 | m = rx.match(line) |
| 182 | if m: break |
| 183 | else: |
| 184 | raise ConfigError(me._file, lno, 'failed to parse line: %r' % line) |
| 185 | |
| 186 | if tag == 'COMMENT': |
| 187 | ## A comment. Ignore it and hope it goes away. |
| 188 | |
| 189 | continue |
| 190 | |
| 191 | elif tag == 'GRPHDR': |
| 192 | ## A group header. Flush the old group and start a new one. |
| 193 | newname = m.group(1) |
| 194 | |
| 195 | if grpname is not None: groups[grpname] = grplist |
| 196 | if newname in groups: |
| 197 | raise ConfigError(me._file, lno, |
| 198 | "duplicate group name `%s'" % newname) |
| 199 | grpname = newname |
| 200 | grplist = [] |
| 201 | |
| 202 | elif tag == 'ASSGN': |
| 203 | ## An assignment. Deal with it. |
| 204 | name, value = m.group(1), m.group(2) |
| 205 | |
| 206 | if grpname is None: |
| 207 | ## We're outside of any group, so this is a global configuration |
| 208 | ## tweak. |
| 209 | |
| 210 | if name == 'test-addr': |
| 211 | for astr in value.split(): |
| 212 | try: |
| 213 | a = parse_address(astr) |
| 214 | except Exception, e: |
| 215 | raise ConfigError(me._file, lno, |
| 216 | "invalid IP address `%s': %s" % |
| 217 | (astr, e)) |
| 218 | if testaddr is not None: |
| 219 | raise ConfigError(me._file, lno, 'duplicate test-address') |
| 220 | testaddr = a |
| 221 | else: |
| 222 | raise ConfigError(me._file, lno, |
| 223 | "unknown global option `%s'" % name) |
| 224 | |
| 225 | else: |
| 226 | ## Parse a pattern and add it to the group. |
| 227 | spec = value.split() |
| 228 | i = 0 |
| 229 | |
| 230 | ## Check for an explicit target address. |
| 231 | if i >= len(spec) or spec[i].find('/') >= 0: |
| 232 | peer = None |
| 233 | else: |
| 234 | try: |
| 235 | peer = parse_address(spec[i]) |
| 236 | except Exception, e: |
| 237 | raise ConfigError(me._file, lno, |
| 238 | "invalid IP address `%s': %s" % |
| 239 | (spec[i], e)) |
| 240 | i += 1 |
| 241 | |
| 242 | ## Parse the local network. |
| 243 | if len(spec) != i + 1: |
| 244 | raise ConfigError(me._file, lno, 'no network defined') |
| 245 | try: |
| 246 | net = parse_net(spec[i]) |
| 247 | except Exception, e: |
| 248 | raise ConfigError(me._file, lno, |
| 249 | "invalid IP network `%s': %s" % |
| 250 | (spec[i], e)) |
| 251 | |
| 252 | ## Add this entry to the list. |
| 253 | grplist.append((name, peer, net)) |
| 254 | |
| 255 | ## Fill in the default test address if necessary. |
| 256 | if testaddr is None: testaddr = TESTADDR |
| 257 | |
| 258 | ## Done. |
| 259 | if grpname is not None: groups[grpname] = grplist |
| 260 | me.testaddr = testaddr |
| 261 | me.groups = groups |
| 262 | |
| 263 | ### This will be a configuration file. |
| 264 | CF = None |
| 265 | |
| 266 | def cmd_showconfig(): |
| 267 | T.svcinfo('test-addr=%s' % CF.testaddr) |
| 268 | def cmd_showgroups(): |
| 269 | for g in sorted(CF.groups.iterkeys()): |
| 270 | T.svcinfo(g) |
| 271 | def cmd_showgroup(g): |
| 272 | try: pats = CF.groups[g] |
| 273 | except KeyError: raise T.TripeJobError('unknown-group', g) |
| 274 | for t, p, n in pats: |
| 275 | T.svcinfo('peer', t, |
| 276 | 'target', p and str(p) or '(default)', |
| 277 | 'net', str(n)) |
| 278 | |
| 279 | ###-------------------------------------------------------------------------- |
| 280 | ### Responding to a network up/down event. |
| 281 | |
| 282 | def localaddr(peer): |
| 283 | """ |
| 284 | Return the local IP address used for talking to PEER. |
| 285 | """ |
| 286 | sk = S.socket(S.AF_INET, S.SOCK_DGRAM) |
| 287 | try: |
| 288 | try: |
| 289 | sk.connect(peer.sockaddr(1)) |
| 290 | addr = sk.getsockname() |
| 291 | return InetAddress.from_sockaddr(addr)[0] |
| 292 | except S.error: |
| 293 | return None |
| 294 | finally: |
| 295 | sk.close() |
| 296 | |
| 297 | _kick = T.Queue() |
| 298 | _delay = None |
| 299 | |
| 300 | def cancel_delay(): |
| 301 | global _delay |
| 302 | if _delay is not None: |
| 303 | if T._debug: print '# cancel delayed kick' |
| 304 | G.source_remove(_delay) |
| 305 | _delay = None |
| 306 | |
| 307 | def netupdown(upness, reason): |
| 308 | """ |
| 309 | Add or kill peers according to whether the network is up or down. |
| 310 | |
| 311 | UPNESS is true if the network is up, or false if it's down. |
| 312 | """ |
| 313 | |
| 314 | _kick.put((upness, reason)) |
| 315 | |
| 316 | def delay_netupdown(upness, reason): |
| 317 | global _delay |
| 318 | cancel_delay() |
| 319 | def _func(): |
| 320 | global _delay |
| 321 | if T._debug: print '# delayed %s: %s' % (upness, reason) |
| 322 | _delay = None |
| 323 | netupdown(upness, reason) |
| 324 | return False |
| 325 | if T._debug: print '# delaying %s: %s' % (upness, reason) |
| 326 | _delay = G.timeout_add(2000, _func) |
| 327 | |
| 328 | def kickpeers(): |
| 329 | while True: |
| 330 | upness, reason = _kick.get() |
| 331 | if T._debug: print '# kickpeers %s: %s' % (upness, reason) |
| 332 | select = [] |
| 333 | cancel_delay() |
| 334 | |
| 335 | ## Make sure the configuration file is up-to-date. Don't worry if we |
| 336 | ## can't do anything useful. |
| 337 | try: |
| 338 | CF.check() |
| 339 | except Exception, exc: |
| 340 | SM.warn('conntrack', 'config-file-error', |
| 341 | exc.__class__.__name__, str(exc)) |
| 342 | |
| 343 | ## Find the current list of peers. |
| 344 | peers = SM.list() |
| 345 | |
| 346 | ## Work out the primary IP address. |
| 347 | if upness: |
| 348 | addr = localaddr(CF.testaddr) |
| 349 | if addr is None: |
| 350 | upness = False |
| 351 | else: |
| 352 | addr = None |
| 353 | if not T._debug: pass |
| 354 | elif addr: print '# local address = %s' % straddr(addr) |
| 355 | else: print '# offline' |
| 356 | |
| 357 | ## Now decide what to do. |
| 358 | changes = [] |
| 359 | for g, pp in CF.groups.iteritems(): |
| 360 | if T._debug: print '# check group %s' % g |
| 361 | |
| 362 | ## Find out which peer in the group ought to be active. |
| 363 | ip = None |
| 364 | map = {} |
| 365 | want = None |
| 366 | for t, p, n in pp: |
| 367 | if p is None or not upness: |
| 368 | ipq = addr |
| 369 | else: |
| 370 | ipq = localaddr(p) |
| 371 | if T._debug: |
| 372 | info = 'peer=%s; target=%s; net=%s; local=%s' % ( |
| 373 | t, p or '(default)', n, straddr(ipq)) |
| 374 | if upness and ip is None and \ |
| 375 | ipq is not None and ipq.withinp(n): |
| 376 | if T._debug: print '# %s: SELECTED' % info |
| 377 | map[t] = 'up' |
| 378 | select.append('%s=%s' % (g, t)) |
| 379 | if t == 'down' or t.startswith('down/'): |
| 380 | want = None |
| 381 | else: |
| 382 | want = t |
| 383 | ip = ipq |
| 384 | else: |
| 385 | map[t] = 'down' |
| 386 | if T._debug: print '# %s: skipped' % info |
| 387 | |
| 388 | ## Shut down the wrong ones. |
| 389 | found = False |
| 390 | if T._debug: print '# peer-map = %r' % map |
| 391 | for p in peers: |
| 392 | what = map.get(p, 'leave') |
| 393 | if what == 'up': |
| 394 | found = True |
| 395 | if T._debug: print '# peer %s: already up' % p |
| 396 | elif what == 'down': |
| 397 | def _(p = p): |
| 398 | try: |
| 399 | SM.kill(p) |
| 400 | except T.TripeError, exc: |
| 401 | if exc.args[0] == 'unknown-peer': |
| 402 | ## Inherently racy; don't worry about this. |
| 403 | pass |
| 404 | else: |
| 405 | raise |
| 406 | if T._debug: print '# peer %s: bring down' % p |
| 407 | changes.append(_) |
| 408 | |
| 409 | ## Start the right one if necessary. |
| 410 | if want is not None and not found: |
| 411 | def _(want = want): |
| 412 | try: |
| 413 | list(SM.svcsubmit('connect', 'active', want)) |
| 414 | except T.TripeError, exc: |
| 415 | SM.warn('conntrack', 'connect-failed', want, *exc.args) |
| 416 | if T._debug: print '# peer %s: bring up' % want |
| 417 | changes.append(_) |
| 418 | |
| 419 | ## Commit the changes. |
| 420 | if changes: |
| 421 | SM.notify('conntrack', upness and 'up' or 'down', *select + reason) |
| 422 | for c in changes: c() |
| 423 | |
| 424 | ###-------------------------------------------------------------------------- |
| 425 | ### NetworkManager monitor. |
| 426 | |
| 427 | DBPROPS_IFACE = 'org.freedesktop.DBus.Properties' |
| 428 | |
| 429 | NM_NAME = 'org.freedesktop.NetworkManager' |
| 430 | NM_PATH = '/org/freedesktop/NetworkManager' |
| 431 | NM_IFACE = NM_NAME |
| 432 | NMCA_IFACE = NM_NAME + '.Connection.Active' |
| 433 | |
| 434 | NM_STATE_CONNECTED = 3 #obsolete |
| 435 | NM_STATE_CONNECTED_LOCAL = 50 |
| 436 | NM_STATE_CONNECTED_SITE = 60 |
| 437 | NM_STATE_CONNECTED_GLOBAL = 70 |
| 438 | NM_CONNSTATES = set([NM_STATE_CONNECTED, |
| 439 | NM_STATE_CONNECTED_LOCAL, |
| 440 | NM_STATE_CONNECTED_SITE, |
| 441 | NM_STATE_CONNECTED_GLOBAL]) |
| 442 | |
| 443 | class NetworkManagerMonitor (object): |
| 444 | """ |
| 445 | Watch NetworkManager signals for changes in network state. |
| 446 | """ |
| 447 | |
| 448 | ## Strategy. There are two kinds of interesting state transitions for us. |
| 449 | ## The first one is the global are-we-connected state, which we'll use to |
| 450 | ## toggle network upness on a global level. The second is which connection |
| 451 | ## has the default route, which we'll use to tweak which peer in the peer |
| 452 | ## group is active. The former is most easily tracked using the signal |
| 453 | ## org.freedesktop.NetworkManager.StateChanged; for the latter, we track |
| 454 | ## org.freedesktop.NetworkManager.Connection.Active.PropertiesChanged and |
| 455 | ## look for when a new connection gains the default route. |
| 456 | |
| 457 | def attach(me, bus): |
| 458 | try: |
| 459 | nm = bus.get_object(NM_NAME, NM_PATH) |
| 460 | state = nm.Get(NM_IFACE, 'State', dbus_interface = DBPROPS_IFACE) |
| 461 | if state in NM_CONNSTATES: |
| 462 | netupdown(True, ['nm', 'initially-connected']) |
| 463 | else: |
| 464 | netupdown(False, ['nm', 'initially-disconnected']) |
| 465 | except D.DBusException, e: |
| 466 | if T._debug: print '# exception attaching to network-manager: %s' % e |
| 467 | bus.add_signal_receiver(me._nm_state, 'StateChanged', |
| 468 | NM_IFACE, NM_NAME, NM_PATH) |
| 469 | bus.add_signal_receiver(me._nm_connchange, 'PropertiesChanged', |
| 470 | NMCA_IFACE, NM_NAME, None) |
| 471 | |
| 472 | def _nm_state(me, state): |
| 473 | if state in NM_CONNSTATES: |
| 474 | delay_netupdown(True, ['nm', 'connected']) |
| 475 | else: |
| 476 | delay_netupdown(False, ['nm', 'disconnected']) |
| 477 | |
| 478 | def _nm_connchange(me, props): |
| 479 | if props.get('Default', False) or props.get('Default6', False): |
| 480 | delay_netupdown(True, ['nm', 'default-connection-change']) |
| 481 | |
| 482 | ##-------------------------------------------------------------------------- |
| 483 | ### Connman monitor. |
| 484 | |
| 485 | CM_NAME = 'net.connman' |
| 486 | CM_PATH = '/' |
| 487 | CM_IFACE = 'net.connman.Manager' |
| 488 | |
| 489 | class ConnManMonitor (object): |
| 490 | """ |
| 491 | Watch ConnMan signls for changes in network state. |
| 492 | """ |
| 493 | |
| 494 | ## Strategy. Everything seems to be usefully encoded in the `State' |
| 495 | ## property. If it's `offline', `idle' or `ready' then we don't expect a |
| 496 | ## network connection. During handover from one network to another, the |
| 497 | ## property passes through `ready' to `online'. |
| 498 | |
| 499 | def attach(me, bus): |
| 500 | try: |
| 501 | cm = bus.get_object(CM_NAME, CM_PATH) |
| 502 | props = cm.GetProperties(dbus_interface = CM_IFACE) |
| 503 | state = props['State'] |
| 504 | netupdown(state == 'online', ['connman', 'initially-%s' % state]) |
| 505 | except D.DBusException, e: |
| 506 | if T._debug: print '# exception attaching to connman: %s' % e |
| 507 | bus.add_signal_receiver(me._cm_state, 'PropertyChanged', |
| 508 | CM_IFACE, CM_NAME, CM_PATH) |
| 509 | |
| 510 | def _cm_state(me, prop, value): |
| 511 | if prop != 'State': return |
| 512 | delay_netupdown(value == 'online', ['connman', value]) |
| 513 | |
| 514 | ###-------------------------------------------------------------------------- |
| 515 | ### Maemo monitor. |
| 516 | |
| 517 | ICD_NAME = 'com.nokia.icd' |
| 518 | ICD_PATH = '/com/nokia/icd' |
| 519 | ICD_IFACE = ICD_NAME |
| 520 | |
| 521 | class MaemoICdMonitor (object): |
| 522 | """ |
| 523 | Watch ICd signals for changes in network state. |
| 524 | """ |
| 525 | |
| 526 | ## Strategy. ICd only handles one connection at a time in steady state, |
| 527 | ## though when switching between connections, it tries to bring the new one |
| 528 | ## up before shutting down the old one. This makes life a bit easier than |
| 529 | ## it is with NetworkManager. On the other hand, the notifications are |
| 530 | ## relative to particular connections only, and the indicator that the old |
| 531 | ## connection is down (`IDLE') comes /after/ the new one comes up |
| 532 | ## (`CONNECTED'), so we have to remember which one is active. |
| 533 | |
| 534 | def attach(me, bus): |
| 535 | try: |
| 536 | icd = bus.get_object(ICD_NAME, ICD_PATH) |
| 537 | try: |
| 538 | iap = icd.get_ipinfo(dbus_interface = ICD_IFACE)[0] |
| 539 | me._iap = iap |
| 540 | netupdown(True, ['icd', 'initially-connected', iap]) |
| 541 | except D.DBusException: |
| 542 | me._iap = None |
| 543 | netupdown(False, ['icd', 'initially-disconnected']) |
| 544 | except D.DBusException, e: |
| 545 | if T._debug: print '# exception attaching to icd: %s' % e |
| 546 | me._iap = None |
| 547 | bus.add_signal_receiver(me._icd_state, 'status_changed', ICD_IFACE, |
| 548 | ICD_NAME, ICD_PATH) |
| 549 | |
| 550 | def _icd_state(me, iap, ty, state, hunoz): |
| 551 | if state == 'CONNECTED': |
| 552 | me._iap = iap |
| 553 | delay_netupdown(True, ['icd', 'connected', iap]) |
| 554 | elif state == 'IDLE' and iap == me._iap: |
| 555 | me._iap = None |
| 556 | delay_netupdown(False, ['icd', 'idle']) |
| 557 | |
| 558 | ###-------------------------------------------------------------------------- |
| 559 | ### D-Bus connection tracking. |
| 560 | |
| 561 | class DBusMonitor (object): |
| 562 | """ |
| 563 | Maintains a connection to the system D-Bus, and watches for signals. |
| 564 | |
| 565 | If the connection is initially down, or drops for some reason, we retry |
| 566 | periodically (every five seconds at the moment). If the connection |
| 567 | resurfaces, we reattach the monitors. |
| 568 | """ |
| 569 | |
| 570 | def __init__(me): |
| 571 | """ |
| 572 | Initialise the object and try to establish a connection to the bus. |
| 573 | """ |
| 574 | me._mons = [] |
| 575 | me._loop = D.mainloop.glib.DBusGMainLoop() |
| 576 | me._state = 'startup' |
| 577 | me._reconnect() |
| 578 | |
| 579 | def addmon(me, mon): |
| 580 | """ |
| 581 | Add a monitor object to watch for signals. |
| 582 | |
| 583 | MON.attach(BUS) is called, with BUS being the connection to the system |
| 584 | bus. MON should query its service's current status and watch for |
| 585 | relevant signals. |
| 586 | """ |
| 587 | me._mons.append(mon) |
| 588 | if me._bus is not None: |
| 589 | mon.attach(me._bus) |
| 590 | |
| 591 | def _reconnect(me, hunoz = None): |
| 592 | """ |
| 593 | Start connecting to the bus. |
| 594 | |
| 595 | If we fail the first time, retry periodically. |
| 596 | """ |
| 597 | if me._state == 'startup': |
| 598 | T.aside(SM.notify, 'conntrack', 'dbus-connection', 'startup') |
| 599 | elif me._state == 'connected': |
| 600 | T.aside(SM.notify, 'conntrack', 'dbus-connection', 'lost') |
| 601 | else: |
| 602 | T.aside(SM.notify, 'conntrack', 'dbus-connection', |
| 603 | 'state=%s' % me._state) |
| 604 | me._state == 'reconnecting' |
| 605 | me._bus = None |
| 606 | if me._try_connect(): |
| 607 | G.timeout_add_seconds(5, me._try_connect) |
| 608 | |
| 609 | def _try_connect(me): |
| 610 | """ |
| 611 | Actually make a connection attempt. |
| 612 | |
| 613 | If we succeed, attach the monitors. |
| 614 | """ |
| 615 | try: |
| 616 | addr = OS.getenv('TRIPE_CONNTRACK_BUS') |
| 617 | if addr == 'SESSION': |
| 618 | bus = D.SessionBus(mainloop = me._loop, private = True) |
| 619 | elif addr is not None: |
| 620 | bus = D.bus.BusConnection(addr, mainloop = me._loop) |
| 621 | else: |
| 622 | bus = D.SystemBus(mainloop = me._loop, private = True) |
| 623 | for m in me._mons: |
| 624 | m.attach(bus) |
| 625 | except D.DBusException, e: |
| 626 | return True |
| 627 | me._bus = bus |
| 628 | me._state = 'connected' |
| 629 | bus.call_on_disconnection(me._reconnect) |
| 630 | T.aside(SM.notify, 'conntrack', 'dbus-connection', 'connected') |
| 631 | return False |
| 632 | |
| 633 | ###-------------------------------------------------------------------------- |
| 634 | ### TrIPE service. |
| 635 | |
| 636 | class GIOWatcher (object): |
| 637 | """ |
| 638 | Monitor I/O events using glib. |
| 639 | """ |
| 640 | def __init__(me, conn, mc = G.main_context_default()): |
| 641 | me._conn = conn |
| 642 | me._watch = None |
| 643 | me._mc = mc |
| 644 | def connected(me, sock): |
| 645 | me._watch = G.io_add_watch(sock, G.IO_IN, |
| 646 | lambda *hunoz: me._conn.receive()) |
| 647 | def disconnected(me): |
| 648 | G.source_remove(me._watch) |
| 649 | me._watch = None |
| 650 | def iterate(me): |
| 651 | me._mc.iteration(True) |
| 652 | |
| 653 | SM.iowatch = GIOWatcher(SM) |
| 654 | |
| 655 | def init(): |
| 656 | """ |
| 657 | Service initialization. |
| 658 | |
| 659 | Add the D-Bus monitor here, because we might send commands off immediately, |
| 660 | and we want to make sure the server connection is up. |
| 661 | """ |
| 662 | global DBM |
| 663 | T.Coroutine(kickpeers, name = 'kickpeers').switch() |
| 664 | DBM = DBusMonitor() |
| 665 | DBM.addmon(NetworkManagerMonitor()) |
| 666 | DBM.addmon(ConnManMonitor()) |
| 667 | DBM.addmon(MaemoICdMonitor()) |
| 668 | G.timeout_add_seconds(30, lambda: (_delay is not None or |
| 669 | netupdown(True, ['interval-timer']) or |
| 670 | True)) |
| 671 | |
| 672 | def parse_options(): |
| 673 | """ |
| 674 | Parse the command-line options. |
| 675 | |
| 676 | Automatically changes directory to the requested configdir, and turns on |
| 677 | debugging. Returns the options object. |
| 678 | """ |
| 679 | op = OptionParser(usage = '%prog [-a FILE] [-d DIR]', |
| 680 | version = '%%prog %s' % VERSION) |
| 681 | |
| 682 | op.add_option('-a', '--admin-socket', |
| 683 | metavar = 'FILE', dest = 'tripesock', default = T.tripesock, |
| 684 | help = 'Select socket to connect to [default %default]') |
| 685 | op.add_option('-d', '--directory', |
| 686 | metavar = 'DIR', dest = 'dir', default = T.configdir, |
| 687 | help = 'Select current diretory [default %default]') |
| 688 | op.add_option('-c', '--config', |
| 689 | metavar = 'FILE', dest = 'conf', default = 'conntrack.conf', |
| 690 | help = 'Select configuration [default %default]') |
| 691 | op.add_option('--daemon', dest = 'daemon', |
| 692 | default = False, action = 'store_true', |
| 693 | help = 'Become a daemon after successful initialization') |
| 694 | op.add_option('--debug', dest = 'debug', |
| 695 | default = False, action = 'store_true', |
| 696 | help = 'Emit debugging trace information') |
| 697 | op.add_option('--startup', dest = 'startup', |
| 698 | default = False, action = 'store_true', |
| 699 | help = 'Being called as part of the server startup') |
| 700 | |
| 701 | opts, args = op.parse_args() |
| 702 | if args: op.error('no arguments permitted') |
| 703 | OS.chdir(opts.dir) |
| 704 | T._debug = opts.debug |
| 705 | return opts |
| 706 | |
| 707 | ## Service table, for running manually. |
| 708 | def cmd_updown(upness): |
| 709 | return lambda *args: T.defer(netupdown, upness, ['manual'] + list(args)) |
| 710 | service_info = [('conntrack', VERSION, { |
| 711 | 'up': (0, None, '', cmd_updown(True)), |
| 712 | 'down': (0, None, '', cmd_updown(False)), |
| 713 | 'show-config': (0, 0, '', cmd_showconfig), |
| 714 | 'show-groups': (0, 0, '', cmd_showgroups), |
| 715 | 'show-group': (1, 1, 'GROUP', cmd_showgroup) |
| 716 | })] |
| 717 | |
| 718 | if __name__ == '__main__': |
| 719 | opts = parse_options() |
| 720 | CF = Config(opts.conf) |
| 721 | T.runservices(opts.tripesock, service_info, |
| 722 | init = init, daemon = opts.daemon) |
| 723 | |
| 724 | ###----- That's all, folks -------------------------------------------------- |