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  • Committer: Björn Påhlsson
  • Date: 2008-08-02 21:06:29 UTC
  • mto: (237.7.1 mandos) (24.1.154 mandos)
  • mto: This revision was merged to the branch mainline in revision 38.
  • Revision ID: belorn@braxen-20080802210629-p9jc5515yufcg4ge
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server.py
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class AvahiService(object):
99
 
    """An Avahi (Zeroconf) service.
100
 
    Attributes:
 
99
    """
101
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
102
101
               Used to optionally bind to the specified interface.
103
 
    name: string; Example: 'Mandos'
104
 
    type: string; Example: '_mandos._tcp'.
105
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
106
 
    port: integer; what port to announce
107
 
    TXT: list of strings; TXT record for the service
108
 
    domain: string; Domain to publish on, default to .local if empty.
109
 
    host: string; Host to publish records for, default is localhost
110
 
    max_renames: integer; maximum number of renames
111
 
    rename_count: integer; counter so we only rename after collisions
112
 
                  a sensible number of times
 
102
    name = string; Example: "Mandos"
 
103
    type = string; Example: "_mandos._tcp".
 
104
                   See <http://www.dns-sd.org/ServiceTypes.html>
 
105
    port = integer; what port to announce
 
106
    TXT = list of strings; TXT record for the service
 
107
    domain = string; Domain to publish on, default to .local if empty.
 
108
    host = string; Host to publish records for, default to localhost
 
109
                   if empty.
 
110
    max_renames = integer; maximum number of renames
 
111
    rename_count = integer; counter so we only rename after collisions
 
112
                   a sensible number of times
113
113
    """
114
114
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
115
                 type = None, port = None, TXT = None, domain = "",
116
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
117
118
        self.interface = interface
118
119
        self.name = name
119
120
        self.type = type
132
133
                            u" retries, exiting.", rename_count)
133
134
            raise AvahiServiceError("Too many renames")
134
135
        name = server.GetAlternativeServiceName(name)
135
 
        logger.error(u"Changing name to %r ...", name)
 
136
        logger.notice(u"Changing name to %r ...", name)
136
137
        self.remove()
137
138
        self.add()
138
139
        self.rename_count += 1
220
221
    interval = property(lambda self: self._interval,
221
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                        _set_interval)
222
223
    del _set_interval
223
 
    def __init__(self, name = None, stop_hook=None, config={}):
224
 
        """Note: the 'checker' key in 'config' sets the
225
 
        'checker_command' attribute and *not* the 'checker'
226
 
        attribute."""
 
224
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
 
225
                 secret=None, secfile=None, fqdn=None, timeout=None,
 
226
                 interval=-1, checker=None):
 
227
        """Note: the 'checker' argument sets the 'checker_command'
 
228
        attribute and not the 'checker' attribute.."""
227
229
        self.name = name
228
230
        logger.debug(u"Creating client %r", self.name)
229
 
        # Uppercase and remove spaces from fingerprint for later
230
 
        # comparison purposes with return value from the fingerprint()
231
 
        # function
232
 
        self.fingerprint = config["fingerprint"].upper()\
233
 
                           .replace(u" ", u"")
 
231
        # Uppercase and remove spaces from fingerprint
 
232
        # for later comparison purposes with return value of
 
233
        # the fingerprint() function
 
234
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
234
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
235
 
        if "secret" in config:
236
 
            self.secret = config["secret"].decode(u"base64")
237
 
        elif "secfile" in config:
238
 
            sf = open(config["secfile"])
 
236
        if secret:
 
237
            self.secret = secret.decode(u"base64")
 
238
        elif secfile:
 
239
            sf = open(secfile)
239
240
            self.secret = sf.read()
240
241
            sf.close()
241
242
        else:
242
243
            raise TypeError(u"No secret or secfile for client %s"
243
244
                            % self.name)
244
 
        self.fqdn = config.get("fqdn", "")
 
245
        self.fqdn = fqdn
245
246
        self.created = datetime.datetime.now()
246
247
        self.last_checked_ok = None
247
 
        self.timeout = string_to_delta(config["timeout"])
248
 
        self.interval = string_to_delta(config["interval"])
 
248
        self.timeout = string_to_delta(timeout)
 
249
        self.interval = string_to_delta(interval)
249
250
        self.stop_hook = stop_hook
250
251
        self.checker = None
251
252
        self.checker_initiator_tag = None
252
253
        self.stop_initiator_tag = None
253
254
        self.checker_callback_tag = None
254
 
        self.check_command = config["checker"]
 
255
        self.check_command = checker
255
256
    def start(self):
256
257
        """Start this client's checker and timeout hooks"""
257
258
        # Schedule a new checker to be started an 'interval' from now,
271
272
        but not currently used."""
272
273
        # If this client doesn't have a secret, it is already stopped.
273
274
        if self.secret:
274
 
            logger.info(u"Stopping client %s", self.name)
 
275
            logger.debug(u"Stopping client %s", self.name)
275
276
            self.secret = None
276
277
        else:
277
278
            return False
296
297
        self.checker = None
297
298
        if os.WIFEXITED(condition) \
298
299
               and (os.WEXITSTATUS(condition) == 0):
299
 
            logger.info(u"Checker for %(name)s succeeded",
300
 
                        vars(self))
 
300
            logger.debug(u"Checker for %(name)s succeeded",
 
301
                         vars(self))
301
302
            self.last_checked_ok = now
302
303
            gobject.source_remove(self.stop_initiator_tag)
303
304
            self.stop_initiator_tag = gobject.timeout_add\
307
308
            logger.warning(u"Checker for %(name)s crashed?",
308
309
                           vars(self))
309
310
        else:
310
 
            logger.info(u"Checker for %(name)s failed",
311
 
                        vars(self))
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
312
313
    def start_checker(self):
313
314
        """Start a new checker subprocess if one is not running.
314
315
        If a checker already exists, leave it running and do
337
338
                                 u' %s', self.check_command, error)
338
339
                    return True # Try again later
339
340
            try:
340
 
                logger.info(u"Starting checker %r for %s",
341
 
                            command, self.name)
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
342
343
                self.checker = subprocess.Popen(command,
343
344
                                                close_fds=True,
344
345
                                                shell=True, cwd="/")
395
396
 
396
397
def fingerprint(openpgp):
397
398
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
399
    # New empty GnuTLS certificate
 
400
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
401
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
402
        (ctypes.byref(crt))
398
403
    # New GnuTLS "datum" with the OpenPGP public key
399
404
    datum = gnutls.library.types.gnutls_datum_t\
400
405
        (ctypes.cast(ctypes.c_char_p(openpgp),
401
406
                     ctypes.POINTER(ctypes.c_ubyte)),
402
407
         ctypes.c_uint(len(openpgp)))
403
 
    # New empty GnuTLS certificate
404
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
405
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
406
 
        (ctypes.byref(crt))
407
408
    # Import the OpenPGP public key into the certificate
408
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
409
 
                    (crt, ctypes.byref(datum),
410
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
409
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
410
        (crt,
 
411
         ctypes.byref(datum),
 
412
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
411
413
    # New buffer for the fingerprint
412
414
    buffer = ctypes.create_string_buffer(20)
413
415
    buffer_length = ctypes.c_size_t()
429
431
    Note: This will run in its own forked process."""
430
432
    
431
433
    def handle(self):
432
 
        logger.info(u"TCP connection from: %s",
 
434
        logger.debug(u"TCP connection from: %s",
433
435
                     unicode(self.client_address))
434
436
        session = gnutls.connection.ClientSession\
435
437
                  (self.request, gnutls.connection.X509Credentials())
436
 
        
437
 
        line = self.request.makefile().readline()
438
 
        logger.debug(u"Protocol version: %r", line)
439
 
        try:
440
 
            if int(line.strip().split()[0]) > 1:
441
 
                raise RuntimeError
442
 
        except (ValueError, IndexError, RuntimeError), error:
443
 
            logger.error(u"Unknown protocol version: %s", error)
444
 
            return
445
 
        
446
438
        # Note: gnutls.connection.X509Credentials is really a generic
447
439
        # GnuTLS certificate credentials object so long as no X.509
448
440
        # keys are added to it.  Therefore, we can use it here despite
461
453
        try:
462
454
            session.handshake()
463
455
        except gnutls.errors.GNUTLSError, error:
464
 
            logger.warning(u"Handshake failed: %s", error)
 
456
            logger.debug(u"Handshake failed: %s", error)
465
457
            # Do not run session.bye() here: the session is not
466
458
            # established.  Just abandon the request.
467
459
            return
468
460
        try:
469
461
            fpr = fingerprint(peer_certificate(session))
470
462
        except (TypeError, gnutls.errors.GNUTLSError), error:
471
 
            logger.warning(u"Bad certificate: %s", error)
 
463
            logger.debug(u"Bad certificate: %s", error)
472
464
            session.bye()
473
465
            return
474
466
        logger.debug(u"Fingerprint: %s", fpr)
478
470
                client = c
479
471
                break
480
472
        if not client:
481
 
            logger.warning(u"Client not found for fingerprint: %s",
482
 
                           fpr)
 
473
            logger.debug(u"Client not found for fingerprint: %s", fpr)
483
474
            session.bye()
484
475
            return
485
476
        # Have to check if client.still_valid(), since it is possible
486
477
        # that the client timed out while establishing the GnuTLS
487
478
        # session.
488
479
        if not client.still_valid():
489
 
            logger.warning(u"Client %(name)s is invalid",
490
 
                           vars(client))
 
480
            logger.debug(u"Client %(name)s is invalid", vars(client))
491
481
            session.bye()
492
482
            return
493
483
        sent_size = 0
528
518
                                       self.settings["interface"])
529
519
            except socket.error, error:
530
520
                if error[0] == errno.EPERM:
531
 
                    logger.error(u"No permission to"
532
 
                                 u" bind to interface %s",
533
 
                                 self.settings["interface"])
 
521
                    logger.warning(u"No permission to"
 
522
                                   u" bind to interface %s",
 
523
                                   self.settings["interface"])
534
524
                else:
535
525
                    raise error
536
526
        # Only bind(2) the socket if we really need to.
582
572
def server_state_changed(state):
583
573
    """Derived from the Avahi example code"""
584
574
    if state == avahi.SERVER_COLLISION:
585
 
        logger.error(u"Server name collision")
 
575
        logger.warning(u"Server name collision")
586
576
        service.remove()
587
577
    elif state == avahi.SERVER_RUNNING:
588
578
        service.add()
602
592
                        unicode(error))
603
593
        raise AvahiGroupError("State changed: %s", str(error))
604
594
 
605
 
def if_nametoindex(interface):
 
595
def if_nametoindex(interface, _func=[None]):
606
596
    """Call the C function if_nametoindex(), or equivalent"""
607
 
    global if_nametoindex
 
597
    if _func[0] is not None:
 
598
        return _func[0](interface)
608
599
    try:
609
600
        if "ctypes.util" not in sys.modules:
610
601
            import ctypes.util
611
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
612
 
            (ctypes.util.find_library("c")).if_nametoindex
 
602
        while True:
 
603
            try:
 
604
                libc = ctypes.cdll.LoadLibrary\
 
605
                       (ctypes.util.find_library("c"))
 
606
                _func[0] = libc.if_nametoindex
 
607
                return _func[0](interface)
 
608
            except IOError, e:
 
609
                if e != errno.EINTR:
 
610
                    raise
613
611
    except (OSError, AttributeError):
614
612
        if "struct" not in sys.modules:
615
613
            import struct
616
614
        if "fcntl" not in sys.modules:
617
615
            import fcntl
618
 
        def if_nametoindex(interface):
 
616
        def the_hard_way(interface):
619
617
            "Get an interface index the hard way, i.e. using fcntl()"
620
618
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
621
619
            s = socket.socket()
624
622
            s.close()
625
623
            interface_index = struct.unpack("I", ifreq[16:20])[0]
626
624
            return interface_index
627
 
    return if_nametoindex(interface)
 
625
        _func[0] = the_hard_way
 
626
        return _func[0](interface)
628
627
 
629
628
 
630
629
def daemon(nochdir, noclose):
752
751
    def remove_from_clients(client):
753
752
        clients.remove(client)
754
753
        if not clients:
755
 
            logger.critical(u"No clients left, exiting")
 
754
            logger.debug(u"No clients left, exiting")
756
755
            sys.exit()
757
756
    
758
 
    clients.update(Set(Client(name = section,
 
757
    clients.update(Set(Client(name=section,
759
758
                              stop_hook = remove_from_clients,
760
 
                              config
761
 
                              = dict(client_config.items(section)))
 
759
                              **(dict(client_config\
 
760
                                      .items(section))))
762
761
                       for section in client_config.sections()))
763
762
    
764
763
    if not debug:
795
794
                                clients=clients)
796
795
    # Find out what port we got
797
796
    service.port = tcp_server.socket.getsockname()[1]
798
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
799
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
797
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
 
798
                 u" scope_id %d" % tcp_server.socket.getsockname())
800
799
    
801
800
    #service.interface = tcp_server.socket.getsockname()[3]
802
801