This file is indexed.

/usr/share/pyshared/dbus/bus.py is in python-dbus 1.0.0-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
# Copyright (C) 2007 Collabora Ltd. <http://www.collabora.co.uk/>
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use, copy,
# modify, merge, publish, distribute, sublicense, and/or sell copies
# of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.

__all__ = ('BusConnection',)
__docformat__ = 'reStructuredText'

import logging
import weakref

from _dbus_bindings import (
    BUS_DAEMON_IFACE, BUS_DAEMON_NAME, BUS_DAEMON_PATH, BUS_SESSION,
    BUS_STARTER, BUS_SYSTEM, DBUS_START_REPLY_ALREADY_RUNNING,
    DBUS_START_REPLY_SUCCESS, NAME_FLAG_ALLOW_REPLACEMENT,
    NAME_FLAG_DO_NOT_QUEUE, NAME_FLAG_REPLACE_EXISTING,
    RELEASE_NAME_REPLY_NON_EXISTENT, RELEASE_NAME_REPLY_NOT_OWNER,
    RELEASE_NAME_REPLY_RELEASED, REQUEST_NAME_REPLY_ALREADY_OWNER,
    REQUEST_NAME_REPLY_EXISTS, REQUEST_NAME_REPLY_IN_QUEUE,
    REQUEST_NAME_REPLY_PRIMARY_OWNER, validate_bus_name, validate_error_name,
    validate_interface_name, validate_member_name, validate_object_path)
from dbus.connection import Connection
from dbus.exceptions import DBusException
from dbus.lowlevel import HANDLER_RESULT_NOT_YET_HANDLED
from dbus._compat import is_py2


_NAME_OWNER_CHANGE_MATCH = ("type='signal',sender='%s',"
                            "interface='%s',member='NameOwnerChanged',"
                            "path='%s',arg0='%%s'"
                            % (BUS_DAEMON_NAME, BUS_DAEMON_IFACE,
                               BUS_DAEMON_PATH))
"""(_NAME_OWNER_CHANGE_MATCH % sender) matches relevant NameOwnerChange
messages"""

_NAME_HAS_NO_OWNER = 'org.freedesktop.DBus.Error.NameHasNoOwner'

_logger = logging.getLogger('dbus.bus')


class NameOwnerWatch(object):
    __slots__ = ('_match', '_pending_call')

    def __init__(self, bus_conn, bus_name, callback):
        validate_bus_name(bus_name)

        def signal_cb(owned, old_owner, new_owner):
            callback(new_owner)

        def error_cb(e):
            if e.get_dbus_name() == _NAME_HAS_NO_OWNER:
                callback('')
            else:
                logging.basicConfig()
                _logger.debug('GetNameOwner(%s) failed:', bus_name,
                              exc_info=(e.__class__, e, None))

        self._match = bus_conn.add_signal_receiver(signal_cb,
                                                   'NameOwnerChanged',
                                                   BUS_DAEMON_IFACE,
                                                   BUS_DAEMON_NAME,
                                                   BUS_DAEMON_PATH,
                                                   arg0=bus_name)
        keywords = {}
        if is_py2:
            keywords['utf8_strings'] = True
        self._pending_call = bus_conn.call_async(BUS_DAEMON_NAME,
                                                 BUS_DAEMON_PATH,
                                                 BUS_DAEMON_IFACE,
                                                 'GetNameOwner',
                                                 's', (bus_name,),
                                                 callback, error_cb,
                                                 **keywords)

    def cancel(self):
        if self._match is not None:
            self._match.remove()
        if self._pending_call is not None:
            self._pending_call.cancel()
        self._match = None
        self._pending_call = None


class BusConnection(Connection):
    """A connection to a D-Bus daemon that implements the
    ``org.freedesktop.DBus`` pseudo-service.

    :Since: 0.81.0
    """

    TYPE_SESSION    = BUS_SESSION
    """Represents a session bus (same as the global dbus.BUS_SESSION)"""

    TYPE_SYSTEM     = BUS_SYSTEM
    """Represents the system bus (same as the global dbus.BUS_SYSTEM)"""

    TYPE_STARTER = BUS_STARTER
    """Represents the bus that started this service by activation (same as
    the global dbus.BUS_STARTER)"""

    START_REPLY_SUCCESS = DBUS_START_REPLY_SUCCESS
    START_REPLY_ALREADY_RUNNING = DBUS_START_REPLY_ALREADY_RUNNING

    def __new__(cls, address_or_type=TYPE_SESSION, mainloop=None):
        bus = cls._new_for_bus(address_or_type, mainloop=mainloop)

        # _bus_names is used by dbus.service.BusName!
        bus._bus_names = weakref.WeakValueDictionary()

        bus._signal_sender_matches = {}
        """Map from SignalMatch to NameOwnerWatch."""

        return bus

    def add_signal_receiver(self, handler_function, signal_name=None,
                            dbus_interface=None, bus_name=None,
                            path=None, **keywords):
        named_service = keywords.pop('named_service', None)
        if named_service is not None:
            if bus_name is not None:
                raise TypeError('bus_name and named_service cannot both be '
                                'specified')
            bus_name = named_service
            from warnings import warn
            warn('Passing the named_service parameter to add_signal_receiver '
                 'by name is deprecated: please use positional parameters',
                 DeprecationWarning, stacklevel=2)

        match = super(BusConnection, self).add_signal_receiver(
                handler_function, signal_name, dbus_interface, bus_name,
                path, **keywords)

        if (bus_name is not None and bus_name != BUS_DAEMON_NAME):
            if bus_name[:1] == ':':
                def callback(new_owner):
                    if new_owner == '':
                        match.remove()
            else:
                callback = match.set_sender_name_owner
            watch = self.watch_name_owner(bus_name, callback)
            self._signal_sender_matches[match] = watch

        self.add_match_string(str(match))

        return match

    def _clean_up_signal_match(self, match):
        # The signals lock is no longer held here (it was in <= 0.81.0)
        self.remove_match_string_non_blocking(str(match))
        watch = self._signal_sender_matches.pop(match, None)
        if watch is not None:
            watch.cancel()

    def activate_name_owner(self, bus_name):
        if (bus_name is not None and bus_name[:1] != ':'
            and bus_name != BUS_DAEMON_NAME):
            try:
                return self.get_name_owner(bus_name)
            except DBusException as e:
                if e.get_dbus_name() != _NAME_HAS_NO_OWNER:
                    raise
                # else it doesn't exist: try to start it
                self.start_service_by_name(bus_name)
                return self.get_name_owner(bus_name)
        else:
            # already unique
            return bus_name

    def get_object(self, bus_name, object_path, introspect=True,
                   follow_name_owner_changes=False, **kwargs):
        """Return a local proxy for the given remote object.

        Method calls on the proxy are translated into method calls on the
        remote object.

        :Parameters:
            `bus_name` : str
                A bus name (either the unique name or a well-known name)
                of the application owning the object. The keyword argument
                named_service is a deprecated alias for this.
            `object_path` : str
                The object path of the desired object
            `introspect` : bool
                If true (default), attempt to introspect the remote
                object to find out supported methods and their signatures
            `follow_name_owner_changes` : bool
                If the object path is a well-known name and this parameter
                is false (default), resolve the well-known name to the unique
                name of its current owner and bind to that instead; if the
                ownership of the well-known name changes in future,
                keep communicating with the original owner.
                This is necessary if the D-Bus API used is stateful.

                If the object path is a well-known name and this parameter
                is true, whenever the well-known name changes ownership in
                future, bind to the new owner, if any.

                If the given object path is a unique name, this parameter
                has no effect.

        :Returns: a `dbus.proxies.ProxyObject`
        :Raises `DBusException`: if resolving the well-known name to a
            unique name fails
        """
        if follow_name_owner_changes:
            self._require_main_loop()   # we don't get the signals otherwise

        named_service = kwargs.pop('named_service', None)
        if named_service is not None:
            if bus_name is not None:
                raise TypeError('bus_name and named_service cannot both '
                                'be specified')
            from warnings import warn
            warn('Passing the named_service parameter to get_object by name '
                 'is deprecated: please use positional parameters',
                 DeprecationWarning, stacklevel=2)
            bus_name = named_service
        if kwargs:
            raise TypeError('get_object does not take these keyword '
                            'arguments: %s' % ', '.join(kwargs.keys()))

        return self.ProxyObjectClass(self, bus_name, object_path,
                                     introspect=introspect,
                                     follow_name_owner_changes=follow_name_owner_changes)

    def get_unix_user(self, bus_name):
        """Get the numeric uid of the process owning the given bus name.

        :Parameters:
            `bus_name` : str
                A bus name, either unique or well-known
        :Returns: a `dbus.UInt32`
        :Since: 0.80.0
        """
        validate_bus_name(bus_name)
        return self.call_blocking(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                                  BUS_DAEMON_IFACE, 'GetConnectionUnixUser',
                                  's', (bus_name,))

    def start_service_by_name(self, bus_name, flags=0):
        """Start a service which will implement the given bus name on this Bus.

        :Parameters:
            `bus_name` : str
                The well-known bus name to be activated.
            `flags` : dbus.UInt32
                Flags to pass to StartServiceByName (currently none are
                defined)

        :Returns: A tuple of 2 elements. The first is always True, the
            second is either START_REPLY_SUCCESS or
            START_REPLY_ALREADY_RUNNING.

        :Raises `DBusException`: if the service could not be started.
        :Since: 0.80.0
        """
        validate_bus_name(bus_name)
        return (True, self.call_blocking(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                                         BUS_DAEMON_IFACE,
                                         'StartServiceByName',
                                         'su', (bus_name, flags)))

    # XXX: it might be nice to signal IN_QUEUE, EXISTS by exception,
    # but this would not be backwards-compatible
    def request_name(self, name, flags=0):
        """Request a bus name.

        :Parameters:
            `name` : str
                The well-known name to be requested
            `flags` : dbus.UInt32
                A bitwise-OR of 0 or more of the flags
                `NAME_FLAG_ALLOW_REPLACEMENT`,
                `NAME_FLAG_REPLACE_EXISTING`
                and `NAME_FLAG_DO_NOT_QUEUE`
        :Returns: `REQUEST_NAME_REPLY_PRIMARY_OWNER`,
            `REQUEST_NAME_REPLY_IN_QUEUE`,
            `REQUEST_NAME_REPLY_EXISTS` or
            `REQUEST_NAME_REPLY_ALREADY_OWNER`
        :Raises `DBusException`: if the bus daemon cannot be contacted or
            returns an error.
        """
        validate_bus_name(name, allow_unique=False)
        return self.call_blocking(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                                  BUS_DAEMON_IFACE, 'RequestName',
                                  'su', (name, flags))

    def release_name(self, name):
        """Release a bus name.

        :Parameters:
            `name` : str
                The well-known name to be released
        :Returns: `RELEASE_NAME_REPLY_RELEASED`,
            `RELEASE_NAME_REPLY_NON_EXISTENT`
            or `RELEASE_NAME_REPLY_NOT_OWNER`
        :Raises `DBusException`: if the bus daemon cannot be contacted or
            returns an error.
        """
        validate_bus_name(name, allow_unique=False)
        return self.call_blocking(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                                  BUS_DAEMON_IFACE, 'ReleaseName',
                                  's', (name,))

    def list_names(self):
        """Return a list of all currently-owned names on the bus.

        :Returns: a dbus.Array of dbus.UTF8String
        :Since: 0.81.0
        """
        keywords = {}
        if is_py2:
            keywords['utf8_strings'] = True
        return self.call_blocking(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                                  BUS_DAEMON_IFACE, 'ListNames',
                                  '', (), **keywords)

    def list_activatable_names(self):
        """Return a list of all names that can be activated on the bus.

        :Returns: a dbus.Array of dbus.UTF8String
        :Since: 0.81.0
        """
        keywords = {}
        if is_py2:
            keywords['utf8_strings'] = True
        return self.call_blocking(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                                  BUS_DAEMON_IFACE, 'ListActivatableNames',
                                  '', (), **keywords)

    def get_name_owner(self, bus_name):
        """Return the unique connection name of the primary owner of the
        given name.

        :Raises `DBusException`: if the `bus_name` has no owner
        :Since: 0.81.0
        """
        keywords = {}
        if is_py2:
            keywords['utf8_strings'] = True
        validate_bus_name(bus_name, allow_unique=False)
        return self.call_blocking(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                                  BUS_DAEMON_IFACE, 'GetNameOwner',
                                  's', (bus_name,), **keywords)

    def watch_name_owner(self, bus_name, callback):
        """Watch the unique connection name of the primary owner of the
        given name.

        `callback` will be called with one argument, which is either the
        unique connection name, or the empty string (meaning the name is
        not owned).

        :Since: 0.81.0
        """
        return NameOwnerWatch(self, bus_name, callback)

    def name_has_owner(self, bus_name):
        """Return True iff the given bus name has an owner on this bus.

        :Parameters:
            `bus_name` : str
                The bus name to look up
        :Returns: a `bool`
        """
        return bool(self.call_blocking(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                                       BUS_DAEMON_IFACE, 'NameHasOwner',
                                       's', (bus_name,)))

    def add_match_string(self, rule):
        """Arrange for this application to receive messages on the bus that
        match the given rule. This version will block.

        :Parameters:
            `rule` : str
                The match rule
        :Raises `DBusException`: on error.
        :Since: 0.80.0
        """
        self.call_blocking(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                           BUS_DAEMON_IFACE, 'AddMatch', 's', (rule,))

    # FIXME: add an async success/error handler capability?
    # (and the same for remove_...)
    def add_match_string_non_blocking(self, rule):
        """Arrange for this application to receive messages on the bus that
        match the given rule. This version will not block, but any errors
        will be ignored.


        :Parameters:
            `rule` : str
                The match rule
        :Raises `DBusException`: on error.
        :Since: 0.80.0
        """
        self.call_async(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                        BUS_DAEMON_IFACE, 'AddMatch', 's', (rule,),
                        None, None)

    def remove_match_string(self, rule):
        """Arrange for this application to receive messages on the bus that
        match the given rule. This version will block.

        :Parameters:
            `rule` : str
                The match rule
        :Raises `DBusException`: on error.
        :Since: 0.80.0
        """
        self.call_blocking(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                           BUS_DAEMON_IFACE, 'RemoveMatch', 's', (rule,))

    def remove_match_string_non_blocking(self, rule):
        """Arrange for this application to receive messages on the bus that
        match the given rule. This version will not block, but any errors
        will be ignored.


        :Parameters:
            `rule` : str
                The match rule
        :Raises `DBusException`: on error.
        :Since: 0.80.0
        """
        self.call_async(BUS_DAEMON_NAME, BUS_DAEMON_PATH,
                        BUS_DAEMON_IFACE, 'RemoveMatch', 's', (rule,),
                        None, None)