/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2008-08-27 01:18:25 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080827011825-ka3ni6xvy2ehi1y8
* .bzrignore: New.

* clients.conf ([foo]): Remove Radix-64 checksum.

* mandos (AvahiService.rename, server_state_changed,
          entry_group_state_changed): Make Avahi log messages more
                                      clear that they are about
                                      Zeroconf.
  (fingerprint): Use plain "0" instead of "ctypes.c_uint(0)".

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Lines of Context:
mandos
11
11
# and some lines in "main".
12
12
# 
13
13
# Everything else is
14
 
# Copyright © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 Björn Påhlsson
 
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
16
15
# 
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
31
30
# Contact the authors at <mandos@fukt.bsnet.se>.
32
31
# 
33
32
 
34
 
from __future__ import division, with_statement, absolute_import
 
33
from __future__ import division
35
34
 
36
35
import SocketServer
37
36
import socket
38
 
import optparse
 
37
import select
 
38
from optparse import OptionParser
39
39
import datetime
40
40
import errno
41
41
import gnutls.crypto
55
55
import stat
56
56
import logging
57
57
import logging.handlers
58
 
import pwd
59
 
from contextlib import closing
60
58
 
61
59
import dbus
62
 
import dbus.service
63
60
import gobject
64
61
import avahi
65
62
from dbus.mainloop.glib import DBusGMainLoop
66
63
import ctypes
67
 
import ctypes.util
68
64
 
69
 
version = "1.0.5"
 
65
version = "1.0"
70
66
 
71
67
logger = logging.Logger('mandos')
72
 
syslogger = (logging.handlers.SysLogHandler
73
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
 
              address = "/dev/log"))
75
 
syslogger.setFormatter(logging.Formatter
76
 
                       ('Mandos: %(levelname)s: %(message)s'))
 
68
syslogger = logging.handlers.SysLogHandler\
 
69
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
70
             address = "/dev/log")
 
71
syslogger.setFormatter(logging.Formatter\
 
72
                        ('Mandos: %(levelname)s: %(message)s'))
77
73
logger.addHandler(syslogger)
78
74
 
79
75
console = logging.StreamHandler()
82
78
logger.addHandler(console)
83
79
 
84
80
class AvahiError(Exception):
85
 
    def __init__(self, value, *args, **kwargs):
 
81
    def __init__(self, value):
86
82
        self.value = value
87
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
88
 
    def __unicode__(self):
89
 
        return unicode(repr(self.value))
 
83
    def __str__(self):
 
84
        return repr(self.value)
90
85
 
91
86
class AvahiServiceError(AvahiError):
92
87
    pass
112
107
                  a sensible number of times
113
108
    """
114
109
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
 
                 servicetype = None, port = None, TXT = None,
116
 
                 domain = "", host = "", max_renames = 32768):
 
110
                 type = None, port = None, TXT = None, domain = "",
 
111
                 host = "", max_renames = 32768):
117
112
        self.interface = interface
118
113
        self.name = name
119
 
        self.type = servicetype
 
114
        self.type = type
120
115
        self.port = port
121
 
        self.TXT = TXT if TXT is not None else []
 
116
        if TXT is None:
 
117
            self.TXT = []
 
118
        else:
 
119
            self.TXT = TXT
122
120
        self.domain = domain
123
121
        self.host = host
124
122
        self.rename_count = 0
128
126
        if self.rename_count >= self.max_renames:
129
127
            logger.critical(u"No suitable Zeroconf service name found"
130
128
                            u" after %i retries, exiting.",
131
 
                            self.rename_count)
132
 
            raise AvahiServiceError(u"Too many renames")
 
129
                            rename_count)
 
130
            raise AvahiServiceError("Too many renames")
133
131
        self.name = server.GetAlternativeServiceName(self.name)
134
132
        logger.info(u"Changing Zeroconf service name to %r ...",
135
133
                    str(self.name))
136
 
        syslogger.setFormatter(logging.Formatter
 
134
        syslogger.setFormatter(logging.Formatter\
137
135
                               ('Mandos (%s): %%(levelname)s:'
138
 
                                ' %%(message)s' % self.name))
 
136
                               ' %%(message)s' % self.name))
139
137
        self.remove()
140
138
        self.add()
141
139
        self.rename_count += 1
147
145
        """Derived from the Avahi example code"""
148
146
        global group
149
147
        if group is None:
150
 
            group = dbus.Interface(bus.get_object
151
 
                                   (avahi.DBUS_NAME,
 
148
            group = dbus.Interface\
 
149
                    (bus.get_object(avahi.DBUS_NAME,
152
150
                                    server.EntryGroupNew()),
153
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
152
            group.connect_to_signal('StateChanged',
155
153
                                    entry_group_state_changed)
156
154
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
170
168
# End of Avahi example code
171
169
 
172
170
 
173
 
def _datetime_to_dbus(dt, variant_level=0):
174
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
175
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
176
 
 
177
 
 
178
 
class Client(dbus.service.Object):
 
171
class Client(object):
179
172
    """A representation of a client host served by this server.
180
173
    Attributes:
181
 
    name:       string; from the config file, used in log messages
 
174
    name:      string; from the config file, used in log messages
182
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
183
176
                 uniquely identify the client
184
 
    secret:     bytestring; sent verbatim (over TLS) to client
185
 
    host:       string; available for use by the checker command
186
 
    created:    datetime.datetime(); (UTC) object creation
187
 
    last_enabled: datetime.datetime(); (UTC)
188
 
    enabled:    bool()
189
 
    last_checked_ok: datetime.datetime(); (UTC) or None
190
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
191
 
                                      until this client is invalid
192
 
    interval:   datetime.timedelta(); How often to start a new checker
193
 
    disable_hook:  If set, called by disable() as disable_hook(self)
194
 
    checker:    subprocess.Popen(); a running checker process used
195
 
                                    to see if the client lives.
196
 
                                    'None' if no process is running.
 
177
    secret:    bytestring; sent verbatim (over TLS) to client
 
178
    host:      string; available for use by the checker command
 
179
    created:   datetime.datetime(); object creation, not client host
 
180
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
181
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
182
                                     until this client is invalid
 
183
    interval:  datetime.timedelta(); How often to start a new checker
 
184
    stop_hook: If set, called by stop() as stop_hook(self)
 
185
    checker:   subprocess.Popen(); a running checker process used
 
186
                                   to see if the client lives.
 
187
                                   'None' if no process is running.
197
188
    checker_initiator_tag: a gobject event source tag, or None
198
 
    disable_initiator_tag:    - '' -
 
189
    stop_initiator_tag:    - '' -
199
190
    checker_callback_tag:  - '' -
200
191
    checker_command: string; External command which is run to check if
201
192
                     client lives.  %() expansions are done at
202
193
                     runtime with vars(self) as dict, so that for
203
194
                     instance %(name)s can be used in the command.
204
 
    use_dbus: bool(); Whether to provide D-Bus interface and signals
205
 
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
 
195
    Private attibutes:
 
196
    _timeout: Real variable for 'timeout'
 
197
    _interval: Real variable for 'interval'
 
198
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
199
    _interval_milliseconds: - '' -
206
200
    """
207
 
    def timeout_milliseconds(self):
208
 
        "Return the 'timeout' attribute in milliseconds"
209
 
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
210
 
                + (self.timeout.seconds * 1000)
211
 
                + (self.timeout.microseconds // 1000))
212
 
    
213
 
    def interval_milliseconds(self):
214
 
        "Return the 'interval' attribute in milliseconds"
215
 
        return ((self.interval.days * 24 * 60 * 60 * 1000)
216
 
                + (self.interval.seconds * 1000)
217
 
                + (self.interval.microseconds // 1000))
218
 
    
219
 
    def __init__(self, name = None, disable_hook=None, config=None,
220
 
                 use_dbus=True):
 
201
    def _set_timeout(self, timeout):
 
202
        "Setter function for 'timeout' attribute"
 
203
        self._timeout = timeout
 
204
        self._timeout_milliseconds = ((self.timeout.days
 
205
                                       * 24 * 60 * 60 * 1000)
 
206
                                      + (self.timeout.seconds * 1000)
 
207
                                      + (self.timeout.microseconds
 
208
                                         // 1000))
 
209
    timeout = property(lambda self: self._timeout,
 
210
                       _set_timeout)
 
211
    del _set_timeout
 
212
    def _set_interval(self, interval):
 
213
        "Setter function for 'interval' attribute"
 
214
        self._interval = interval
 
215
        self._interval_milliseconds = ((self.interval.days
 
216
                                        * 24 * 60 * 60 * 1000)
 
217
                                       + (self.interval.seconds
 
218
                                          * 1000)
 
219
                                       + (self.interval.microseconds
 
220
                                          // 1000))
 
221
    interval = property(lambda self: self._interval,
 
222
                        _set_interval)
 
223
    del _set_interval
 
224
    def __init__(self, name = None, stop_hook=None, config={}):
221
225
        """Note: the 'checker' key in 'config' sets the
222
226
        'checker_command' attribute and *not* the 'checker'
223
227
        attribute."""
224
228
        self.name = name
225
 
        if config is None:
226
 
            config = {}
227
229
        logger.debug(u"Creating client %r", self.name)
228
 
        self.use_dbus = use_dbus
229
 
        if self.use_dbus:
230
 
            self.dbus_object_path = (dbus.ObjectPath
231
 
                                     ("/Mandos/clients/"
232
 
                                      + self.name.replace(".", "_")))
233
 
            dbus.service.Object.__init__(self, bus,
234
 
                                         self.dbus_object_path)
235
230
        # Uppercase and remove spaces from fingerprint for later
236
231
        # comparison purposes with return value from the fingerprint()
237
232
        # function
238
 
        self.fingerprint = (config["fingerprint"].upper()
239
 
                            .replace(u" ", u""))
 
233
        self.fingerprint = config["fingerprint"].upper()\
 
234
                           .replace(u" ", u"")
240
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
241
236
        if "secret" in config:
242
237
            self.secret = config["secret"].decode(u"base64")
243
238
        elif "secfile" in config:
244
 
            with closing(open(os.path.expanduser
245
 
                              (os.path.expandvars
246
 
                               (config["secfile"])))) as secfile:
247
 
                self.secret = secfile.read()
 
239
            sf = open(config["secfile"])
 
240
            self.secret = sf.read()
 
241
            sf.close()
248
242
        else:
249
243
            raise TypeError(u"No secret or secfile for client %s"
250
244
                            % self.name)
251
245
        self.host = config.get("host", "")
252
 
        self.created = datetime.datetime.utcnow()
253
 
        self.enabled = False
254
 
        self.last_enabled = None
 
246
        self.created = datetime.datetime.now()
255
247
        self.last_checked_ok = None
256
248
        self.timeout = string_to_delta(config["timeout"])
257
249
        self.interval = string_to_delta(config["interval"])
258
 
        self.disable_hook = disable_hook
 
250
        self.stop_hook = stop_hook
259
251
        self.checker = None
260
252
        self.checker_initiator_tag = None
261
 
        self.disable_initiator_tag = None
 
253
        self.stop_initiator_tag = None
262
254
        self.checker_callback_tag = None
263
 
        self.checker_command = config["checker"]
264
 
    
265
 
    def enable(self):
 
255
        self.check_command = config["checker"]
 
256
    def start(self):
266
257
        """Start this client's checker and timeout hooks"""
267
 
        self.last_enabled = datetime.datetime.utcnow()
268
258
        # Schedule a new checker to be started an 'interval' from now,
269
259
        # and every interval from then on.
270
 
        self.checker_initiator_tag = (gobject.timeout_add
271
 
                                      (self.interval_milliseconds(),
272
 
                                       self.start_checker))
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
273
263
        # Also start a new checker *right now*.
274
264
        self.start_checker()
275
 
        # Schedule a disable() when 'timeout' has passed
276
 
        self.disable_initiator_tag = (gobject.timeout_add
277
 
                                   (self.timeout_milliseconds(),
278
 
                                    self.disable))
279
 
        self.enabled = True
280
 
        if self.use_dbus:
281
 
            # Emit D-Bus signals
282
 
            self.PropertyChanged(dbus.String(u"enabled"),
283
 
                                 dbus.Boolean(True, variant_level=1))
284
 
            self.PropertyChanged(dbus.String(u"last_enabled"),
285
 
                                 (_datetime_to_dbus(self.last_enabled,
286
 
                                                    variant_level=1)))
287
 
    
288
 
    def disable(self):
289
 
        """Disable this client."""
290
 
        if not getattr(self, "enabled", False):
 
265
        # Schedule a stop() when 'timeout' has passed
 
266
        self.stop_initiator_tag = gobject.timeout_add\
 
267
                                  (self._timeout_milliseconds,
 
268
                                   self.stop)
 
269
    def stop(self):
 
270
        """Stop this client.
 
271
        The possibility that a client might be restarted is left open,
 
272
        but not currently used."""
 
273
        # If this client doesn't have a secret, it is already stopped.
 
274
        if hasattr(self, "secret") and self.secret:
 
275
            logger.info(u"Stopping client %s", self.name)
 
276
            self.secret = None
 
277
        else:
291
278
            return False
292
 
        logger.info(u"Disabling client %s", self.name)
293
 
        if getattr(self, "disable_initiator_tag", False):
294
 
            gobject.source_remove(self.disable_initiator_tag)
295
 
            self.disable_initiator_tag = None
 
279
        if getattr(self, "stop_initiator_tag", False):
 
280
            gobject.source_remove(self.stop_initiator_tag)
 
281
            self.stop_initiator_tag = None
296
282
        if getattr(self, "checker_initiator_tag", False):
297
283
            gobject.source_remove(self.checker_initiator_tag)
298
284
            self.checker_initiator_tag = None
299
285
        self.stop_checker()
300
 
        if self.disable_hook:
301
 
            self.disable_hook(self)
302
 
        self.enabled = False
303
 
        if self.use_dbus:
304
 
            # Emit D-Bus signal
305
 
            self.PropertyChanged(dbus.String(u"enabled"),
306
 
                                 dbus.Boolean(False, variant_level=1))
 
286
        if self.stop_hook:
 
287
            self.stop_hook(self)
307
288
        # Do not run this again if called by a gobject.timeout_add
308
289
        return False
309
 
    
310
290
    def __del__(self):
311
 
        self.disable_hook = None
312
 
        self.disable()
313
 
    
314
 
    def checker_callback(self, pid, condition, command):
 
291
        self.stop_hook = None
 
292
        self.stop()
 
293
    def checker_callback(self, pid, condition):
315
294
        """The checker has completed, so take appropriate actions."""
 
295
        now = datetime.datetime.now()
316
296
        self.checker_callback_tag = None
317
297
        self.checker = None
318
 
        if self.use_dbus:
319
 
            # Emit D-Bus signal
320
 
            self.PropertyChanged(dbus.String(u"checker_running"),
321
 
                                 dbus.Boolean(False, variant_level=1))
322
 
        if (os.WIFEXITED(condition)
323
 
            and (os.WEXITSTATUS(condition) == 0)):
 
298
        if os.WIFEXITED(condition) \
 
299
               and (os.WEXITSTATUS(condition) == 0):
324
300
            logger.info(u"Checker for %(name)s succeeded",
325
301
                        vars(self))
326
 
            if self.use_dbus:
327
 
                # Emit D-Bus signal
328
 
                self.CheckerCompleted(dbus.Boolean(True),
329
 
                                      dbus.UInt16(condition),
330
 
                                      dbus.String(command))
331
 
            self.bump_timeout()
 
302
            self.last_checked_ok = now
 
303
            gobject.source_remove(self.stop_initiator_tag)
 
304
            self.stop_initiator_tag = gobject.timeout_add\
 
305
                                      (self._timeout_milliseconds,
 
306
                                       self.stop)
332
307
        elif not os.WIFEXITED(condition):
333
308
            logger.warning(u"Checker for %(name)s crashed?",
334
309
                           vars(self))
335
 
            if self.use_dbus:
336
 
                # Emit D-Bus signal
337
 
                self.CheckerCompleted(dbus.Boolean(False),
338
 
                                      dbus.UInt16(condition),
339
 
                                      dbus.String(command))
340
310
        else:
341
311
            logger.info(u"Checker for %(name)s failed",
342
312
                        vars(self))
343
 
            if self.use_dbus:
344
 
                # Emit D-Bus signal
345
 
                self.CheckerCompleted(dbus.Boolean(False),
346
 
                                      dbus.UInt16(condition),
347
 
                                      dbus.String(command))
348
 
    
349
 
    def bump_timeout(self):
350
 
        """Bump up the timeout for this client.
351
 
        This should only be called when the client has been seen,
352
 
        alive and well.
353
 
        """
354
 
        self.last_checked_ok = datetime.datetime.utcnow()
355
 
        gobject.source_remove(self.disable_initiator_tag)
356
 
        self.disable_initiator_tag = (gobject.timeout_add
357
 
                                      (self.timeout_milliseconds(),
358
 
                                       self.disable))
359
 
        if self.use_dbus:
360
 
            # Emit D-Bus signal
361
 
            self.PropertyChanged(
362
 
                dbus.String(u"last_checked_ok"),
363
 
                (_datetime_to_dbus(self.last_checked_ok,
364
 
                                   variant_level=1)))
365
 
    
366
313
    def start_checker(self):
367
314
        """Start a new checker subprocess if one is not running.
368
315
        If a checker already exists, leave it running and do
377
324
        # is as it should be.
378
325
        if self.checker is None:
379
326
            try:
380
 
                # In case checker_command has exactly one % operator
381
 
                command = self.checker_command % self.host
 
327
                # In case check_command has exactly one % operator
 
328
                command = self.check_command % self.host
382
329
            except TypeError:
383
330
                # Escape attributes for the shell
384
331
                escaped_attrs = dict((key, re.escape(str(val)))
385
332
                                     for key, val in
386
333
                                     vars(self).iteritems())
387
334
                try:
388
 
                    command = self.checker_command % escaped_attrs
 
335
                    command = self.check_command % escaped_attrs
389
336
                except TypeError, error:
390
337
                    logger.error(u'Could not format string "%s":'
391
 
                                 u' %s', self.checker_command, error)
 
338
                                 u' %s', self.check_command, error)
392
339
                    return True # Try again later
393
340
            try:
394
341
                logger.info(u"Starting checker %r for %s",
400
347
                self.checker = subprocess.Popen(command,
401
348
                                                close_fds=True,
402
349
                                                shell=True, cwd="/")
403
 
                if self.use_dbus:
404
 
                    # Emit D-Bus signal
405
 
                    self.CheckerStarted(command)
406
 
                    self.PropertyChanged(
407
 
                        dbus.String("checker_running"),
408
 
                        dbus.Boolean(True, variant_level=1))
409
 
                self.checker_callback_tag = (gobject.child_watch_add
410
 
                                             (self.checker.pid,
411
 
                                              self.checker_callback,
412
 
                                              data=command))
 
350
                self.checker_callback_tag = gobject.child_watch_add\
 
351
                                            (self.checker.pid,
 
352
                                             self.checker_callback)
413
353
            except OSError, error:
414
354
                logger.error(u"Failed to start subprocess: %s",
415
355
                             error)
416
356
        # Re-run this periodically if run by gobject.timeout_add
417
357
        return True
418
 
    
419
358
    def stop_checker(self):
420
359
        """Force the checker process, if any, to stop."""
421
360
        if self.checker_callback_tag:
433
372
            if error.errno != errno.ESRCH: # No such process
434
373
                raise
435
374
        self.checker = None
436
 
        if self.use_dbus:
437
 
            self.PropertyChanged(dbus.String(u"checker_running"),
438
 
                                 dbus.Boolean(False, variant_level=1))
439
 
    
440
375
    def still_valid(self):
441
376
        """Has the timeout not yet passed for this client?"""
442
 
        if not getattr(self, "enabled", False):
443
 
            return False
444
 
        now = datetime.datetime.utcnow()
 
377
        now = datetime.datetime.now()
445
378
        if self.last_checked_ok is None:
446
379
            return now < (self.created + self.timeout)
447
380
        else:
448
381
            return now < (self.last_checked_ok + self.timeout)
449
 
    
450
 
    ## D-Bus methods & signals
451
 
    _interface = u"org.mandos_system.Mandos.Client"
452
 
    
453
 
    # BumpTimeout - method
454
 
    BumpTimeout = dbus.service.method(_interface)(bump_timeout)
455
 
    BumpTimeout.__name__ = "BumpTimeout"
456
 
    
457
 
    # CheckerCompleted - signal
458
 
    @dbus.service.signal(_interface, signature="bqs")
459
 
    def CheckerCompleted(self, success, condition, command):
460
 
        "D-Bus signal"
461
 
        pass
462
 
    
463
 
    # CheckerStarted - signal
464
 
    @dbus.service.signal(_interface, signature="s")
465
 
    def CheckerStarted(self, command):
466
 
        "D-Bus signal"
467
 
        pass
468
 
    
469
 
    # GetAllProperties - method
470
 
    @dbus.service.method(_interface, out_signature="a{sv}")
471
 
    def GetAllProperties(self):
472
 
        "D-Bus method"
473
 
        return dbus.Dictionary({
474
 
                dbus.String("name"):
475
 
                    dbus.String(self.name, variant_level=1),
476
 
                dbus.String("fingerprint"):
477
 
                    dbus.String(self.fingerprint, variant_level=1),
478
 
                dbus.String("host"):
479
 
                    dbus.String(self.host, variant_level=1),
480
 
                dbus.String("created"):
481
 
                    _datetime_to_dbus(self.created, variant_level=1),
482
 
                dbus.String("last_enabled"):
483
 
                    (_datetime_to_dbus(self.last_enabled,
484
 
                                       variant_level=1)
485
 
                     if self.last_enabled is not None
486
 
                     else dbus.Boolean(False, variant_level=1)),
487
 
                dbus.String("enabled"):
488
 
                    dbus.Boolean(self.enabled, variant_level=1),
489
 
                dbus.String("last_checked_ok"):
490
 
                    (_datetime_to_dbus(self.last_checked_ok,
491
 
                                       variant_level=1)
492
 
                     if self.last_checked_ok is not None
493
 
                     else dbus.Boolean (False, variant_level=1)),
494
 
                dbus.String("timeout"):
495
 
                    dbus.UInt64(self.timeout_milliseconds(),
496
 
                                variant_level=1),
497
 
                dbus.String("interval"):
498
 
                    dbus.UInt64(self.interval_milliseconds(),
499
 
                                variant_level=1),
500
 
                dbus.String("checker"):
501
 
                    dbus.String(self.checker_command,
502
 
                                variant_level=1),
503
 
                dbus.String("checker_running"):
504
 
                    dbus.Boolean(self.checker is not None,
505
 
                                 variant_level=1),
506
 
                }, signature="sv")
507
 
    
508
 
    # IsStillValid - method
509
 
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
510
 
                    (still_valid))
511
 
    IsStillValid.__name__ = "IsStillValid"
512
 
    
513
 
    # PropertyChanged - signal
514
 
    @dbus.service.signal(_interface, signature="sv")
515
 
    def PropertyChanged(self, property, value):
516
 
        "D-Bus signal"
517
 
        pass
518
 
    
519
 
    # SetChecker - method
520
 
    @dbus.service.method(_interface, in_signature="s")
521
 
    def SetChecker(self, checker):
522
 
        "D-Bus setter method"
523
 
        self.checker_command = checker
524
 
        # Emit D-Bus signal
525
 
        self.PropertyChanged(dbus.String(u"checker"),
526
 
                             dbus.String(self.checker_command,
527
 
                                         variant_level=1))
528
 
    
529
 
    # SetHost - method
530
 
    @dbus.service.method(_interface, in_signature="s")
531
 
    def SetHost(self, host):
532
 
        "D-Bus setter method"
533
 
        self.host = host
534
 
        # Emit D-Bus signal
535
 
        self.PropertyChanged(dbus.String(u"host"),
536
 
                             dbus.String(self.host, variant_level=1))
537
 
    
538
 
    # SetInterval - method
539
 
    @dbus.service.method(_interface, in_signature="t")
540
 
    def SetInterval(self, milliseconds):
541
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
542
 
        # Emit D-Bus signal
543
 
        self.PropertyChanged(dbus.String(u"interval"),
544
 
                             (dbus.UInt64(self.interval_milliseconds(),
545
 
                                          variant_level=1)))
546
 
    
547
 
    # SetSecret - method
548
 
    @dbus.service.method(_interface, in_signature="ay",
549
 
                         byte_arrays=True)
550
 
    def SetSecret(self, secret):
551
 
        "D-Bus setter method"
552
 
        self.secret = str(secret)
553
 
    
554
 
    # SetTimeout - method
555
 
    @dbus.service.method(_interface, in_signature="t")
556
 
    def SetTimeout(self, milliseconds):
557
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
558
 
        # Emit D-Bus signal
559
 
        self.PropertyChanged(dbus.String(u"timeout"),
560
 
                             (dbus.UInt64(self.timeout_milliseconds(),
561
 
                                          variant_level=1)))
562
 
    
563
 
    # Enable - method
564
 
    Enable = dbus.service.method(_interface)(enable)
565
 
    Enable.__name__ = "Enable"
566
 
    
567
 
    # StartChecker - method
568
 
    @dbus.service.method(_interface)
569
 
    def StartChecker(self):
570
 
        "D-Bus method"
571
 
        self.start_checker()
572
 
    
573
 
    # Disable - method
574
 
    @dbus.service.method(_interface)
575
 
    def Disable(self):
576
 
        "D-Bus method"
577
 
        self.disable()
578
 
    
579
 
    # StopChecker - method
580
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
581
 
    StopChecker.__name__ = "StopChecker"
582
 
    
583
 
    del _interface
584
382
 
585
383
 
586
384
def peer_certificate(session):
587
385
    "Return the peer's OpenPGP certificate as a bytestring"
588
386
    # If not an OpenPGP certificate...
589
 
    if (gnutls.library.functions
590
 
        .gnutls_certificate_type_get(session._c_object)
591
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
387
    if gnutls.library.functions.gnutls_certificate_type_get\
 
388
            (session._c_object) \
 
389
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
592
390
        # ...do the normal thing
593
391
        return session.peer_certificate
594
392
    list_size = ctypes.c_uint()
595
 
    cert_list = (gnutls.library.functions
596
 
                 .gnutls_certificate_get_peers
597
 
                 (session._c_object, ctypes.byref(list_size)))
 
393
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
394
        (session._c_object, ctypes.byref(list_size))
598
395
    if list_size.value == 0:
599
396
        return None
600
397
    cert = cert_list[0]
604
401
def fingerprint(openpgp):
605
402
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
606
403
    # New GnuTLS "datum" with the OpenPGP public key
607
 
    datum = (gnutls.library.types
608
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
609
 
                                         ctypes.POINTER
610
 
                                         (ctypes.c_ubyte)),
611
 
                             ctypes.c_uint(len(openpgp))))
 
404
    datum = gnutls.library.types.gnutls_datum_t\
 
405
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
406
                     ctypes.POINTER(ctypes.c_ubyte)),
 
407
         ctypes.c_uint(len(openpgp)))
612
408
    # New empty GnuTLS certificate
613
409
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
614
 
    (gnutls.library.functions
615
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
410
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
411
        (ctypes.byref(crt))
616
412
    # Import the OpenPGP public key into the certificate
617
 
    (gnutls.library.functions
618
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
619
 
                                gnutls.library.constants
620
 
                                .GNUTLS_OPENPGP_FMT_RAW))
 
413
    gnutls.library.functions.gnutls_openpgp_crt_import\
 
414
                    (crt, ctypes.byref(datum),
 
415
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
621
416
    # Verify the self signature in the key
622
 
    crtverify = ctypes.c_uint()
623
 
    (gnutls.library.functions
624
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
 
417
    crtverify = ctypes.c_uint();
 
418
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
 
419
        (crt, 0, ctypes.byref(crtverify))
625
420
    if crtverify.value != 0:
626
421
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
627
422
        raise gnutls.errors.CertificateSecurityError("Verify failed")
628
423
    # New buffer for the fingerprint
629
 
    buf = ctypes.create_string_buffer(20)
630
 
    buf_len = ctypes.c_size_t()
 
424
    buffer = ctypes.create_string_buffer(20)
 
425
    buffer_length = ctypes.c_size_t()
631
426
    # Get the fingerprint from the certificate into the buffer
632
 
    (gnutls.library.functions
633
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
634
 
                                         ctypes.byref(buf_len)))
 
427
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
428
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
635
429
    # Deinit the certificate
636
430
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
637
431
    # Convert the buffer to a Python bytestring
638
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
432
    fpr = ctypes.string_at(buffer, buffer_length.value)
639
433
    # Convert the bytestring to hexadecimal notation
640
434
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
641
435
    return hex_fpr
642
436
 
643
437
 
644
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
438
class tcp_handler(SocketServer.BaseRequestHandler, object):
645
439
    """A TCP request handler class.
646
440
    Instantiated by IPv6_TCPServer for each request to handle it.
647
441
    Note: This will run in its own forked process."""
648
442
    
649
443
    def handle(self):
650
444
        logger.info(u"TCP connection from: %s",
651
 
                    unicode(self.client_address))
652
 
        session = (gnutls.connection
653
 
                   .ClientSession(self.request,
654
 
                                  gnutls.connection
655
 
                                  .X509Credentials()))
 
445
                     unicode(self.client_address))
 
446
        session = gnutls.connection.ClientSession\
 
447
                  (self.request, gnutls.connection.X509Credentials())
656
448
        
657
449
        line = self.request.makefile().readline()
658
450
        logger.debug(u"Protocol version: %r", line)
671
463
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
672
464
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
673
465
        #                "+DHE-DSS"))
674
 
        # Use a fallback default, since this MUST be set.
675
 
        priority = self.server.settings.get("priority", "NORMAL")
676
 
        (gnutls.library.functions
677
 
         .gnutls_priority_set_direct(session._c_object,
678
 
                                     priority, None))
 
466
        priority = "NORMAL"             # Fallback default, since this
 
467
                                        # MUST be set.
 
468
        if self.server.settings["priority"]:
 
469
            priority = self.server.settings["priority"]
 
470
        gnutls.library.functions.gnutls_priority_set_direct\
 
471
            (session._c_object, priority, None);
679
472
        
680
473
        try:
681
474
            session.handshake()
691
484
            session.bye()
692
485
            return
693
486
        logger.debug(u"Fingerprint: %s", fpr)
 
487
        client = None
694
488
        for c in self.server.clients:
695
489
            if c.fingerprint == fpr:
696
490
                client = c
697
491
                break
698
 
        else:
 
492
        if not client:
699
493
            logger.warning(u"Client not found for fingerprint: %s",
700
494
                           fpr)
701
495
            session.bye()
708
502
                           vars(client))
709
503
            session.bye()
710
504
            return
711
 
        ## This won't work here, since we're in a fork.
712
 
        # client.bump_timeout()
713
505
        sent_size = 0
714
506
        while sent_size < len(client.secret):
715
507
            sent = session.send(client.secret[sent_size:])
720
512
        session.bye()
721
513
 
722
514
 
723
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
724
 
                     SocketServer.TCPServer, object):
 
515
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
725
516
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
726
517
    Attributes:
727
518
        settings:       Server settings
728
519
        clients:        Set() of Client objects
729
 
        enabled:        Boolean; whether this server is activated yet
730
520
    """
731
521
    address_family = socket.AF_INET6
732
522
    def __init__(self, *args, **kwargs):
736
526
        if "clients" in kwargs:
737
527
            self.clients = kwargs["clients"]
738
528
            del kwargs["clients"]
739
 
        self.enabled = False
740
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
529
        return super(type(self), self).__init__(*args, **kwargs)
741
530
    def server_bind(self):
742
531
        """This overrides the normal server_bind() function
743
532
        to bind to an interface if one was specified, and also NOT to
772
561
#                                            if_nametoindex
773
562
#                                            (self.settings
774
563
#                                             ["interface"]))
775
 
            return super(IPv6_TCPServer, self).server_bind()
776
 
    def server_activate(self):
777
 
        if self.enabled:
778
 
            return super(IPv6_TCPServer, self).server_activate()
779
 
    def enable(self):
780
 
        self.enabled = True
 
564
            return super(type(self), self).server_bind()
781
565
 
782
566
 
783
567
def string_to_delta(interval):
799
583
    timevalue = datetime.timedelta(0)
800
584
    for s in interval.split():
801
585
        try:
802
 
            suffix = unicode(s[-1])
803
 
            value = int(s[:-1])
 
586
            suffix=unicode(s[-1])
 
587
            value=int(s[:-1])
804
588
            if suffix == u"d":
805
589
                delta = datetime.timedelta(value)
806
590
            elif suffix == u"s":
840
624
    elif state == avahi.ENTRY_GROUP_FAILURE:
841
625
        logger.critical(u"Avahi: Error in group state changed %s",
842
626
                        unicode(error))
843
 
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
627
        raise AvahiGroupError("State changed: %s", str(error))
844
628
 
845
629
def if_nametoindex(interface):
846
630
    """Call the C function if_nametoindex(), or equivalent"""
847
631
    global if_nametoindex
848
632
    try:
849
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
850
 
                          (ctypes.util.find_library("c"))
851
 
                          .if_nametoindex)
 
633
        if "ctypes.util" not in sys.modules:
 
634
            import ctypes.util
 
635
        if_nametoindex = ctypes.cdll.LoadLibrary\
 
636
            (ctypes.util.find_library("c")).if_nametoindex
852
637
    except (OSError, AttributeError):
853
638
        if "struct" not in sys.modules:
854
639
            import struct
857
642
        def if_nametoindex(interface):
858
643
            "Get an interface index the hard way, i.e. using fcntl()"
859
644
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
860
 
            with closing(socket.socket()) as s:
861
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
862
 
                                    struct.pack("16s16x", interface))
 
645
            s = socket.socket()
 
646
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
647
                                struct.pack("16s16x", interface))
 
648
            s.close()
863
649
            interface_index = struct.unpack("I", ifreq[16:20])[0]
864
650
            return interface_index
865
651
    return if_nametoindex(interface)
889
675
 
890
676
 
891
677
def main():
892
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
678
    global main_loop_started
 
679
    main_loop_started = False
 
680
    
 
681
    parser = OptionParser(version = "%%prog %s" % version)
893
682
    parser.add_option("-i", "--interface", type="string",
894
683
                      metavar="IF", help="Bind to interface IF")
895
684
    parser.add_option("-a", "--address", type="string",
896
685
                      help="Address to listen for requests on")
897
686
    parser.add_option("-p", "--port", type="int",
898
687
                      help="Port number to receive requests on")
899
 
    parser.add_option("--check", action="store_true",
 
688
    parser.add_option("--check", action="store_true", default=False,
900
689
                      help="Run self-test")
901
690
    parser.add_option("--debug", action="store_true",
902
691
                      help="Debug mode; run in foreground and log to"
909
698
                      default="/etc/mandos", metavar="DIR",
910
699
                      help="Directory to search for configuration"
911
700
                      " files")
912
 
    parser.add_option("--no-dbus", action="store_false",
913
 
                      dest="use_dbus",
914
 
                      help="Do not provide D-Bus system bus"
915
 
                      " interface")
916
 
    options = parser.parse_args()[0]
 
701
    (options, args) = parser.parse_args()
917
702
    
918
703
    if options.check:
919
704
        import doctest
928
713
                        "priority":
929
714
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
930
715
                        "servicename": "Mandos",
931
 
                        "use_dbus": "True",
932
716
                        }
933
717
    
934
718
    # Parse config file for server-global settings
937
721
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
938
722
    # Convert the SafeConfigParser object to a dict
939
723
    server_settings = server_config.defaults()
940
 
    # Use getboolean on the boolean config options
941
 
    server_settings["debug"] = (server_config.getboolean
942
 
                                ("DEFAULT", "debug"))
943
 
    server_settings["use_dbus"] = (server_config.getboolean
944
 
                                   ("DEFAULT", "use_dbus"))
 
724
    # Use getboolean on the boolean config option
 
725
    server_settings["debug"] = server_config.getboolean\
 
726
                               ("DEFAULT", "debug")
945
727
    del server_config
946
728
    
947
729
    # Override the settings from the config file with command line
948
730
    # options, if set.
949
731
    for option in ("interface", "address", "port", "debug",
950
 
                   "priority", "servicename", "configdir",
951
 
                   "use_dbus"):
 
732
                   "priority", "servicename", "configdir"):
952
733
        value = getattr(options, option)
953
734
        if value is not None:
954
735
            server_settings[option] = value
955
736
    del options
956
737
    # Now we have our good server settings in "server_settings"
957
738
    
958
 
    # For convenience
959
739
    debug = server_settings["debug"]
960
 
    use_dbus = server_settings["use_dbus"]
961
740
    
962
741
    if not debug:
963
742
        syslogger.setLevel(logging.WARNING)
964
743
        console.setLevel(logging.WARNING)
965
744
    
966
745
    if server_settings["servicename"] != "Mandos":
967
 
        syslogger.setFormatter(logging.Formatter
 
746
        syslogger.setFormatter(logging.Formatter\
968
747
                               ('Mandos (%s): %%(levelname)s:'
969
748
                                ' %%(message)s'
970
749
                                % server_settings["servicename"]))
972
751
    # Parse config file with clients
973
752
    client_defaults = { "timeout": "1h",
974
753
                        "interval": "5m",
975
 
                        "checker": "fping -q -- %%(host)s",
 
754
                        "checker": "fping -q -- %(host)s",
976
755
                        "host": "",
977
756
                        }
978
757
    client_config = ConfigParser.SafeConfigParser(client_defaults)
979
758
    client_config.read(os.path.join(server_settings["configdir"],
980
759
                                    "clients.conf"))
981
760
    
982
 
    clients = Set()
983
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
984
 
                                 server_settings["port"]),
985
 
                                TCP_handler,
986
 
                                settings=server_settings,
987
 
                                clients=clients)
988
 
    pidfilename = "/var/run/mandos.pid"
989
 
    try:
990
 
        pidfile = open(pidfilename, "w")
991
 
    except IOError, error:
992
 
        logger.error("Could not open file %r", pidfilename)
993
 
    
994
 
    try:
995
 
        uid = pwd.getpwnam("_mandos").pw_uid
996
 
        gid = pwd.getpwnam("_mandos").pw_gid
997
 
    except KeyError:
998
 
        try:
999
 
            uid = pwd.getpwnam("mandos").pw_uid
1000
 
            gid = pwd.getpwnam("mandos").pw_gid
1001
 
        except KeyError:
1002
 
            try:
1003
 
                uid = pwd.getpwnam("nobody").pw_uid
1004
 
                gid = pwd.getpwnam("nogroup").pw_gid
1005
 
            except KeyError:
1006
 
                uid = 65534
1007
 
                gid = 65534
1008
 
    try:
1009
 
        os.setuid(uid)
1010
 
        os.setgid(gid)
1011
 
    except OSError, error:
1012
 
        if error[0] != errno.EPERM:
1013
 
            raise error
1014
 
    
1015
761
    global service
1016
762
    service = AvahiService(name = server_settings["servicename"],
1017
 
                           servicetype = "_mandos._tcp", )
 
763
                           type = "_mandos._tcp", );
1018
764
    if server_settings["interface"]:
1019
 
        service.interface = (if_nametoindex
1020
 
                             (server_settings["interface"]))
 
765
        service.interface = if_nametoindex\
 
766
                            (server_settings["interface"])
1021
767
    
1022
768
    global main_loop
1023
769
    global bus
1030
776
                                           avahi.DBUS_PATH_SERVER),
1031
777
                            avahi.DBUS_INTERFACE_SERVER)
1032
778
    # End of Avahi example code
1033
 
    if use_dbus:
1034
 
        bus_name = dbus.service.BusName(u"org.mandos-system.Mandos",
1035
 
                                        bus)
 
779
    
 
780
    clients = Set()
 
781
    def remove_from_clients(client):
 
782
        clients.remove(client)
 
783
        if not clients:
 
784
            logger.critical(u"No clients left, exiting")
 
785
            sys.exit()
1036
786
    
1037
787
    clients.update(Set(Client(name = section,
 
788
                              stop_hook = remove_from_clients,
1038
789
                              config
1039
 
                              = dict(client_config.items(section)),
1040
 
                              use_dbus = use_dbus)
 
790
                              = dict(client_config.items(section)))
1041
791
                       for section in client_config.sections()))
1042
792
    if not clients:
1043
 
        logger.warning(u"No clients defined")
 
793
        logger.critical(u"No clients defined")
 
794
        sys.exit(1)
1044
795
    
1045
796
    if debug:
1046
797
        # Redirect stdin so all checkers get /dev/null
1054
805
        # Close all input and output, do double fork, etc.
1055
806
        daemon()
1056
807
    
 
808
    pidfilename = "/var/run/mandos/mandos.pid"
 
809
    pid = os.getpid()
1057
810
    try:
1058
 
        pid = os.getpid()
 
811
        pidfile = open(pidfilename, "w")
1059
812
        pidfile.write(str(pid) + "\n")
1060
813
        pidfile.close()
1061
814
        del pidfile
1062
 
    except IOError:
1063
 
        logger.error(u"Could not write to file %r with PID %d",
1064
 
                     pidfilename, pid)
1065
 
    except NameError:
1066
 
        # "pidfile" was never created
1067
 
        pass
1068
 
    del pidfilename
 
815
    except IOError, err:
 
816
        logger.error(u"Could not write %s file with PID %d",
 
817
                     pidfilename, os.getpid())
1069
818
    
1070
819
    def cleanup():
1071
820
        "Cleanup function; run on exit"
1078
827
        
1079
828
        while clients:
1080
829
            client = clients.pop()
1081
 
            client.disable_hook = None
1082
 
            client.disable()
 
830
            client.stop_hook = None
 
831
            client.stop()
1083
832
    
1084
833
    atexit.register(cleanup)
1085
834
    
1088
837
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1089
838
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1090
839
    
1091
 
    if use_dbus:
1092
 
        class MandosServer(dbus.service.Object):
1093
 
            """A D-Bus proxy object"""
1094
 
            def __init__(self):
1095
 
                dbus.service.Object.__init__(self, bus,
1096
 
                                             "/Mandos")
1097
 
            _interface = u"org.mandos_system.Mandos"
1098
 
 
1099
 
            @dbus.service.signal(_interface, signature="oa{sv}")
1100
 
            def ClientAdded(self, objpath, properties):
1101
 
                "D-Bus signal"
1102
 
                pass
1103
 
 
1104
 
            @dbus.service.signal(_interface, signature="o")
1105
 
            def ClientRemoved(self, objpath):
1106
 
                "D-Bus signal"
1107
 
                pass
1108
 
 
1109
 
            @dbus.service.method(_interface, out_signature="ao")
1110
 
            def GetAllClients(self):
1111
 
                return dbus.Array(c.dbus_object_path for c in clients)
1112
 
 
1113
 
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1114
 
            def GetAllClientsWithProperties(self):
1115
 
                return dbus.Dictionary(
1116
 
                    ((c.dbus_object_path, c.GetAllProperties())
1117
 
                     for c in clients),
1118
 
                    signature="oa{sv}")
1119
 
 
1120
 
            @dbus.service.method(_interface, in_signature="o")
1121
 
            def RemoveClient(self, object_path):
1122
 
                for c in clients:
1123
 
                    if c.dbus_object_path == object_path:
1124
 
                        clients.remove(c)
1125
 
                        # Don't signal anything except ClientRemoved
1126
 
                        c.use_dbus = False
1127
 
                        c.disable()
1128
 
                        # Emit D-Bus signal
1129
 
                        self.ClientRemoved(object_path)
1130
 
                        return
1131
 
                raise KeyError
1132
 
            @dbus.service.method(_interface)
1133
 
            def Quit(self):
1134
 
                main_loop.quit()
1135
 
 
1136
 
            del _interface
1137
 
    
1138
 
        mandos_server = MandosServer()
1139
 
    
1140
840
    for client in clients:
1141
 
        if use_dbus:
1142
 
            # Emit D-Bus signal
1143
 
            mandos_server.ClientAdded(client.dbus_object_path,
1144
 
                                      client.GetAllProperties())
1145
 
        client.enable()
1146
 
    
1147
 
    tcp_server.enable()
1148
 
    tcp_server.server_activate()
1149
 
    
 
841
        client.start()
 
842
    
 
843
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
844
                                 server_settings["port"]),
 
845
                                tcp_handler,
 
846
                                settings=server_settings,
 
847
                                clients=clients)
1150
848
    # Find out what port we got
1151
849
    service.port = tcp_server.socket.getsockname()[1]
1152
850
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
1166
864
        
1167
865
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1168
866
                             lambda *args, **kwargs:
1169
 
                             (tcp_server.handle_request
1170
 
                              (*args[2:], **kwargs) or True))
 
867
                             tcp_server.handle_request\
 
868
                             (*args[2:], **kwargs) or True)
1171
869
        
1172
870
        logger.debug(u"Starting main loop")
 
871
        main_loop_started = True
1173
872
        main_loop.run()
1174
873
    except AvahiError, error:
1175
 
        logger.critical(u"AvahiError: %s", error)
 
874
        logger.critical(u"AvahiError: %s" + unicode(error))
1176
875
        sys.exit(1)
1177
876
    except KeyboardInterrupt:
1178
877
        if debug: