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  • Committer: Teddy Hogeborn
  • Date: 2014-06-07 20:29:36 UTC
  • Revision ID: teddy@recompile.se-20140607202936-crh5fxrdd804oora
Fix typo in code comment.

* debian/mandos.postinst: Fix typo in comment.

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mandos-monitor
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# 
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# Mandos Monitor - Control and monitor the Mandos server
5
5
# 
6
 
# Copyright © 2009-2011 Teddy Hogeborn
7
 
# Copyright © 2009-2011 Björn Påhlsson
 
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# Copyright © 2009-2014 Teddy Hogeborn
 
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# Copyright © 2009-2014 Björn Påhlsson
8
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# 
9
9
# This program is free software: you can redistribute it and/or modify
10
10
# it under the terms of the GNU General Public License as published by
17
17
#     GNU General Public License for more details.
18
18
# 
19
19
# You should have received a copy of the GNU General Public License
20
 
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
20
# along with this program.  If not, see
 
21
# <http://www.gnu.org/licenses/>.
21
22
# 
22
23
# Contact the authors at <mandos@recompile.se>.
23
24
# 
24
25
 
25
26
from __future__ import (division, absolute_import, print_function,
26
27
                        unicode_literals)
 
28
try:
 
29
    from future_builtins import *
 
30
except ImportError:
 
31
    pass
27
32
 
28
33
import sys
29
34
import os
30
 
import signal
31
35
 
32
36
import datetime
33
37
 
35
39
import urwid
36
40
 
37
41
from dbus.mainloop.glib import DBusGMainLoop
38
 
import gobject
 
42
try:
 
43
    import gobject
 
44
except ImportError:
 
45
    from gi.repository import GObject as gobject
39
46
 
40
47
import dbus
41
48
 
42
 
import UserList
43
 
 
44
49
import locale
45
50
 
 
51
if sys.version_info[0] == 2:
 
52
    str = unicode
 
53
 
46
54
locale.setlocale(locale.LC_ALL, '')
47
55
 
48
56
import logging
52
60
domain = 'se.recompile'
53
61
server_interface = domain + '.Mandos'
54
62
client_interface = domain + '.Mandos.Client'
55
 
version = "1.4.1"
56
 
 
57
 
# Always run in monochrome mode
58
 
urwid.curses_display.curses.has_colors = lambda : False
59
 
 
60
 
# Urwid doesn't support blinking, but we want it.  Since we have no
61
 
# use for underline on its own, we make underline also always blink.
62
 
urwid.curses_display.curses.A_UNDERLINE |= (
63
 
    urwid.curses_display.curses.A_BLINK)
 
63
version = "1.6.5"
64
64
 
65
65
def isoformat_to_datetime(iso):
66
66
    "Parse an ISO 8601 date string to a datetime.datetime()"
83
83
    properties and calls a hook function when any of them are
84
84
    changed.
85
85
    """
86
 
    def __init__(self, proxy_object=None, *args, **kwargs):
 
86
    def __init__(self, proxy_object=None, properties=None, **kwargs):
87
87
        self.proxy = proxy_object # Mandos Client proxy object
88
 
        
89
 
        self.properties = dict()
 
88
        self.properties = dict() if properties is None else properties
90
89
        self.property_changed_match = (
91
90
            self.proxy.connect_to_signal("PropertyChanged",
92
 
                                         self.property_changed,
 
91
                                         self._property_changed,
93
92
                                         client_interface,
94
93
                                         byte_arrays=True))
95
94
        
96
 
        self.properties.update(
97
 
            self.proxy.GetAll(client_interface,
98
 
                              dbus_interface = dbus.PROPERTIES_IFACE))
99
 
 
100
 
        #XXX This breaks good super behaviour
101
 
#        super(MandosClientPropertyCache, self).__init__(
102
 
#            *args, **kwargs)
 
95
        if properties is None:
 
96
            self.properties.update(
 
97
                self.proxy.GetAll(client_interface,
 
98
                                  dbus_interface
 
99
                                  = dbus.PROPERTIES_IFACE))
 
100
        
 
101
        super(MandosClientPropertyCache, self).__init__(**kwargs)
 
102
    
 
103
    def _property_changed(self, property, value):
 
104
        """Helper which takes positional arguments"""
 
105
        return self.property_changed(property=property, value=value)
103
106
    
104
107
    def property_changed(self, property=None, value=None):
105
108
        """This is called whenever we get a PropertyChanged signal
108
111
        # Update properties dict with new value
109
112
        self.properties[property] = value
110
113
    
111
 
    def delete(self, *args, **kwargs):
 
114
    def delete(self):
112
115
        self.property_changed_match.remove()
113
 
        super(MandosClientPropertyCache, self).__init__(
114
 
            *args, **kwargs)
115
116
 
116
117
 
117
118
class MandosClientWidget(urwid.FlowWidget, MandosClientPropertyCache):
119
120
    """
120
121
    
121
122
    def __init__(self, server_proxy_object=None, update_hook=None,
122
 
                 delete_hook=None, logger=None, *args, **kwargs):
 
123
                 delete_hook=None, logger=None, **kwargs):
123
124
        # Called on update
124
125
        self.update_hook = update_hook
125
126
        # Called on delete
130
131
        self.logger = logger
131
132
        
132
133
        self._update_timer_callback_tag = None
133
 
        self._update_timer_callback_lock = 0
134
 
        self.last_checker_failed = False
135
134
        
136
135
        # The widget shown normally
137
136
        self._text_widget = urwid.Text("")
138
137
        # The widget shown when we have focus
139
138
        self._focus_text_widget = urwid.Text("")
140
 
        super(MandosClientWidget, self).__init__(
141
 
            update_hook=update_hook, delete_hook=delete_hook,
142
 
            *args, **kwargs)
 
139
        super(MandosClientWidget, self).__init__(**kwargs)
143
140
        self.update()
144
141
        self.opened = False
145
142
        
146
 
        last_checked_ok = isoformat_to_datetime(self.properties
147
 
                                                ["LastCheckedOK"])
148
 
        if last_checked_ok is None:
149
 
            self.last_checker_failed = True
150
 
        else:
151
 
            self.last_checker_failed = ((datetime.datetime.utcnow()
152
 
                                         - last_checked_ok)
153
 
                                        > datetime.timedelta
154
 
                                        (milliseconds=
155
 
                                         self.properties
156
 
                                         ["Interval"]))
157
 
        
158
 
        if self.last_checker_failed:
159
 
            self.using_timer(True)
160
 
        
161
 
        if self.need_approval:
162
 
            self.using_timer(True)
163
 
        
164
143
        self.match_objects = (
165
144
            self.proxy.connect_to_signal("CheckerCompleted",
166
145
                                         self.checker_completed,
182
161
                                         self.rejected,
183
162
                                         client_interface,
184
163
                                         byte_arrays=True))
185
 
        #self.logger('Created client %s' % (self.properties["Name"]))
 
164
        #self.logger('Created client {0}'
 
165
        #            .format(self.properties["Name"]))
186
166
    
187
 
    def property_changed(self, property=None, value=None):
188
 
        super(self, MandosClientWidget).property_changed(property,
189
 
                                                         value)
190
 
        if property == "ApprovalPending":
191
 
            using_timer(bool(value))
192
 
        
193
167
    def using_timer(self, flag):
194
168
        """Call this method with True or False when timer should be
195
169
        activated or deactivated.
196
170
        """
197
 
        old = self._update_timer_callback_lock
198
 
        if flag:
199
 
            self._update_timer_callback_lock += 1
200
 
        else:
201
 
            self._update_timer_callback_lock -= 1
202
 
        if old == 0 and self._update_timer_callback_lock:
 
171
        if flag and self._update_timer_callback_tag is None:
203
172
            # Will update the shown timer value every second
204
173
            self._update_timer_callback_tag = (gobject.timeout_add
205
174
                                               (1000,
206
175
                                                self.update_timer))
207
 
        elif old and self._update_timer_callback_lock == 0:
 
176
        elif not (flag or self._update_timer_callback_tag is None):
208
177
            gobject.source_remove(self._update_timer_callback_tag)
209
178
            self._update_timer_callback_tag = None
210
179
    
211
180
    def checker_completed(self, exitstatus, condition, command):
212
181
        if exitstatus == 0:
213
 
            if self.last_checker_failed:
214
 
                self.last_checker_failed = False
215
 
                self.using_timer(False)
216
 
            #self.logger('Checker for client %s (command "%s")'
217
 
            #            ' was successful'
218
 
            #            % (self.properties["Name"], command))
219
182
            self.update()
220
183
            return
221
184
        # Checker failed
222
 
        if not self.last_checker_failed:
223
 
            self.last_checker_failed = True
224
 
            self.using_timer(True)
225
185
        if os.WIFEXITED(condition):
226
 
            self.logger('Checker for client %s (command "%s")'
227
 
                        ' failed with exit code %s'
228
 
                        % (self.properties["Name"], command,
229
 
                           os.WEXITSTATUS(condition)))
 
186
            self.logger('Checker for client {0} (command "{1}")'
 
187
                        ' failed with exit code {2}'
 
188
                        .format(self.properties["Name"], command,
 
189
                                os.WEXITSTATUS(condition)))
230
190
        elif os.WIFSIGNALED(condition):
231
 
            self.logger('Checker for client %s (command "%s")'
232
 
                        ' was killed by signal %s'
233
 
                        % (self.properties["Name"], command,
234
 
                           os.WTERMSIG(condition)))
 
191
            self.logger('Checker for client {0} (command "{1}") was'
 
192
                        ' killed by signal {2}'
 
193
                        .format(self.properties["Name"], command,
 
194
                                os.WTERMSIG(condition)))
235
195
        elif os.WCOREDUMP(condition):
236
 
            self.logger('Checker for client %s (command "%s")'
 
196
            self.logger('Checker for client {0} (command "{1}")'
237
197
                        ' dumped core'
238
 
                        % (self.properties["Name"], command))
 
198
                        .format(self.properties["Name"], command))
239
199
        else:
240
 
            self.logger('Checker for client %s completed'
241
 
                        ' mysteriously')
 
200
            self.logger('Checker for client {0} completed'
 
201
                        ' mysteriously'
 
202
                        .format(self.properties["Name"]))
242
203
        self.update()
243
204
    
244
205
    def checker_started(self, command):
245
 
        #self.logger('Client %s started checker "%s"'
246
 
        #            % (self.properties["Name"], unicode(command)))
 
206
        """Server signals that a checker started. This could be useful
 
207
           to log in the future. """
 
208
        #self.logger('Client {0} started checker "{1}"'
 
209
        #            .format(self.properties["Name"],
 
210
        #                    str(command)))
247
211
        pass
248
212
    
249
213
    def got_secret(self):
250
 
        self.last_checker_failed = False
251
 
        self.logger('Client %s received its secret'
252
 
                    % self.properties["Name"])
 
214
        self.logger('Client {0} received its secret'
 
215
                    .format(self.properties["Name"]))
253
216
    
254
217
    def need_approval(self, timeout, default):
255
218
        if not default:
256
 
            message = 'Client %s needs approval within %s seconds'
 
219
            message = 'Client {0} needs approval within {1} seconds'
257
220
        else:
258
 
            message = 'Client %s will get its secret in %s seconds'
259
 
        self.logger(message
260
 
                    % (self.properties["Name"], timeout/1000))
261
 
        self.using_timer(True)
 
221
            message = 'Client {0} will get its secret in {1} seconds'
 
222
        self.logger(message.format(self.properties["Name"],
 
223
                                   timeout/1000))
262
224
    
263
225
    def rejected(self, reason):
264
 
        self.logger('Client %s was rejected; reason: %s'
265
 
                    % (self.properties["Name"], reason))
 
226
        self.logger('Client {0} was rejected; reason: {1}'
 
227
                    .format(self.properties["Name"], reason))
266
228
    
267
229
    def selectable(self):
268
230
        """Make this a "selectable" widget.
290
252
                          "bold-underline-blink":
291
253
                              "bold-underline-blink-standout",
292
254
                          }
293
 
 
 
255
        
294
256
        # Rebuild focus and non-focus widgets using current properties
295
 
 
 
257
        
296
258
        # Base part of a client. Name!
297
 
        base = ('%(name)s: '
298
 
                      % {"name": self.properties["Name"]})
 
259
        base = '{name}: '.format(name=self.properties["Name"])
299
260
        if not self.properties["Enabled"]:
300
261
            message = "DISABLED"
 
262
            self.using_timer(False)
301
263
        elif self.properties["ApprovalPending"]:
302
264
            timeout = datetime.timedelta(milliseconds
303
265
                                         = self.properties
305
267
            last_approval_request = isoformat_to_datetime(
306
268
                self.properties["LastApprovalRequest"])
307
269
            if last_approval_request is not None:
308
 
                timer = timeout - (datetime.datetime.utcnow()
309
 
                                   - last_approval_request)
 
270
                timer = max(timeout - (datetime.datetime.utcnow()
 
271
                                       - last_approval_request),
 
272
                            datetime.timedelta())
310
273
            else:
311
274
                timer = datetime.timedelta()
312
275
            if self.properties["ApprovedByDefault"]:
313
 
                message = "Approval in %s. (d)eny?"
 
276
                message = "Approval in {0}. (d)eny?"
314
277
            else:
315
 
                message = "Denial in %s. (a)pprove?"
316
 
            message = message % unicode(timer).rsplit(".", 1)[0]
317
 
        elif self.last_checker_failed:
318
 
            # When checker has failed, print a timer until client expires
 
278
                message = "Denial in {0}. (a)pprove?"
 
279
            message = message.format(str(timer).rsplit(".", 1)[0])
 
280
            self.using_timer(True)
 
281
        elif self.properties["LastCheckerStatus"] != 0:
 
282
            # When checker has failed, show timer until client expires
319
283
            expires = self.properties["Expires"]
320
284
            if expires == "":
321
285
                timer = datetime.timedelta(0)
322
286
            else:
323
 
                expires = datetime.datetime.strptime(expires,
324
 
                                                     '%Y-%m-%dT%H:%M:%S.%f')
325
 
                timer = expires - datetime.datetime.utcnow()
 
287
                expires = (datetime.datetime.strptime
 
288
                           (expires, '%Y-%m-%dT%H:%M:%S.%f'))
 
289
                timer = max(expires - datetime.datetime.utcnow(),
 
290
                            datetime.timedelta())
326
291
            message = ('A checker has failed! Time until client'
327
 
                       ' gets disabled: %s'
328
 
                           % unicode(timer).rsplit(".", 1)[0])
 
292
                       ' gets disabled: {0}'
 
293
                       .format(str(timer).rsplit(".", 1)[0]))
 
294
            self.using_timer(True)
329
295
        else:
330
296
            message = "enabled"
331
 
        self._text = "%s%s" % (base, message)
332
 
            
 
297
            self.using_timer(False)
 
298
        self._text = "{0}{1}".format(base, message)
 
299
        
333
300
        if not urwid.supports_unicode():
334
301
            self._text = self._text.encode("ascii", "replace")
335
302
        textlist = [("normal", self._text)]
352
319
        self.update()
353
320
        return True             # Keep calling this
354
321
    
355
 
    def delete(self, *args, **kwargs):
 
322
    def delete(self, **kwargs):
356
323
        if self._update_timer_callback_tag is not None:
357
324
            gobject.source_remove(self._update_timer_callback_tag)
358
325
            self._update_timer_callback_tag = None
361
328
        self.match_objects = ()
362
329
        if self.delete_hook is not None:
363
330
            self.delete_hook(self)
364
 
        return super(MandosClientWidget, self).delete(*args, **kwargs)
 
331
        return super(MandosClientWidget, self).delete(**kwargs)
365
332
    
366
333
    def render(self, maxcolrow, focus=False):
367
334
        """Render differently if we have focus.
409
376
        else:
410
377
            return key
411
378
    
412
 
    def property_changed(self, property=None, value=None,
413
 
                         *args, **kwargs):
 
379
    def property_changed(self, property=None, **kwargs):
414
380
        """Call self.update() if old value is not new value.
415
381
        This overrides the method from MandosClientPropertyCache"""
416
 
        property_name = unicode(property)
 
382
        property_name = str(property)
417
383
        old_value = self.properties.get(property_name)
418
384
        super(MandosClientWidget, self).property_changed(
419
 
            property=property, value=value, *args, **kwargs)
 
385
            property=property, **kwargs)
420
386
        if self.properties.get(property_name) != old_value:
421
387
            self.update()
422
388
 
426
392
    "down" key presses, thus not allowing any containing widgets to
427
393
    use them as an excuse to shift focus away from this widget.
428
394
    """
429
 
    def keypress(self, maxcolrow, key):
430
 
        ret = super(ConstrainedListBox, self).keypress(maxcolrow, key)
 
395
    def keypress(self, *args, **kwargs):
 
396
        ret = super(ConstrainedListBox, self).keypress(*args, **kwargs)
431
397
        if ret in ("up", "down"):
432
398
            return
433
399
        return ret
446
412
                ("normal",
447
413
                 "default", "default", None),
448
414
                ("bold",
449
 
                 "default", "default", "bold"),
 
415
                 "bold", "default", "bold"),
450
416
                ("underline-blink",
451
 
                 "default", "default", "underline"),
 
417
                 "underline,blink", "default", "underline,blink"),
452
418
                ("standout",
453
 
                 "default", "default", "standout"),
 
419
                 "standout", "default", "standout"),
454
420
                ("bold-underline-blink",
455
 
                 "default", "default", ("bold", "underline")),
 
421
                 "bold,underline,blink", "default", "bold,underline,blink"),
456
422
                ("bold-standout",
457
 
                 "default", "default", ("bold", "standout")),
 
423
                 "bold,standout", "default", "bold,standout"),
458
424
                ("underline-blink-standout",
459
 
                 "default", "default", ("underline", "standout")),
 
425
                 "underline,blink,standout", "default",
 
426
                 "underline,blink,standout"),
460
427
                ("bold-underline-blink-standout",
461
 
                 "default", "default", ("bold", "underline",
462
 
                                          "standout")),
 
428
                 "bold,underline,blink,standout", "default",
 
429
                 "bold,underline,blink,standout"),
463
430
                ))
464
431
        
465
432
        if urwid.supports_unicode():
497
464
        
498
465
        self.busname = domain + '.Mandos'
499
466
        self.main_loop = gobject.MainLoop()
500
 
        self.bus = dbus.SystemBus()
501
 
        mandos_dbus_objc = self.bus.get_object(
502
 
            self.busname, "/", follow_name_owner_changes=True)
503
 
        self.mandos_serv = dbus.Interface(mandos_dbus_objc,
504
 
                                          dbus_interface
505
 
                                          = server_interface)
506
 
        try:
507
 
            mandos_clients = (self.mandos_serv
508
 
                              .GetAllClientsWithProperties())
509
 
        except dbus.exceptions.DBusException:
510
 
            mandos_clients = dbus.Dictionary()
511
 
        
512
 
        (self.mandos_serv
513
 
         .connect_to_signal("ClientRemoved",
514
 
                            self.find_and_remove_client,
515
 
                            dbus_interface=server_interface,
516
 
                            byte_arrays=True))
517
 
        (self.mandos_serv
518
 
         .connect_to_signal("ClientAdded",
519
 
                            self.add_new_client,
520
 
                            dbus_interface=server_interface,
521
 
                            byte_arrays=True))
522
 
        (self.mandos_serv
523
 
         .connect_to_signal("ClientNotFound",
524
 
                            self.client_not_found,
525
 
                            dbus_interface=server_interface,
526
 
                            byte_arrays=True))
527
 
        for path, client in mandos_clients.iteritems():
528
 
            client_proxy_object = self.bus.get_object(self.busname,
529
 
                                                      path)
530
 
            self.add_client(MandosClientWidget(server_proxy_object
531
 
                                               =self.mandos_serv,
532
 
                                               proxy_object
533
 
                                               =client_proxy_object,
534
 
                                               properties=client,
535
 
                                               update_hook
536
 
                                               =self.refresh,
537
 
                                               delete_hook
538
 
                                               =self.remove_client,
539
 
                                               logger
540
 
                                               =self.log_message),
541
 
                            path=path)
542
467
    
543
468
    def client_not_found(self, fingerprint, address):
544
 
        self.log_message(("Client with address %s and fingerprint %s"
545
 
                          " could not be found" % (address,
546
 
                                                    fingerprint)))
 
469
        self.log_message("Client with address {0} and fingerprint"
 
470
                         " {1} could not be found"
 
471
                         .format(address, fingerprint))
547
472
    
548
473
    def rebuild(self):
549
474
        """This rebuilds the User Interface.
559
484
                                                     self.divider)))
560
485
        if self.log_visible:
561
486
            self.uilist.append(self.logbox)
562
 
            pass
563
487
        self.topwidget = urwid.Pile(self.uilist)
564
488
    
565
489
    def log_message(self, message):
 
490
        """Log message formatted with timestamp"""
566
491
        timestamp = datetime.datetime.now().isoformat()
567
492
        self.log_message_raw(timestamp + ": " + message)
568
493
    
581
506
        self.log_visible = not self.log_visible
582
507
        self.rebuild()
583
508
        #self.log_message("Log visibility changed to: "
584
 
        #                 + unicode(self.log_visible))
 
509
        #                 + str(self.log_visible))
585
510
    
586
511
    def change_log_display(self):
587
512
        """Change type of log display.
603
528
            client = self.clients_dict[path]
604
529
        except KeyError:
605
530
            # not found?
606
 
            self.log_message("Unknown client %r (%r) removed", name,
607
 
                             path)
 
531
            self.log_message("Unknown client {0!r} ({1!r}) removed"
 
532
                             .format(name, path))
608
533
            return
609
534
        client.delete()
610
535
    
627
552
        if path is None:
628
553
            path = client.proxy.object_path
629
554
        self.clients_dict[path] = client
630
 
        self.clients.sort(None, lambda c: c.properties["Name"])
 
555
        self.clients.sort(key=lambda c: c.properties["Name"])
631
556
        self.refresh()
632
557
    
633
558
    def remove_client(self, client, path=None):
635
560
        if path is None:
636
561
            path = client.proxy.object_path
637
562
        del self.clients_dict[path]
638
 
        if not self.clients_dict:
639
 
            # Work around bug in Urwid 0.9.8.3 - if a SimpleListWalker
640
 
            # is completely emptied, we need to recreate it.
641
 
            self.clients = urwid.SimpleListWalker([])
642
 
            self.rebuild()
643
563
        self.refresh()
644
564
    
645
565
    def refresh(self):
649
569
    
650
570
    def run(self):
651
571
        """Start the main loop and exit when it's done."""
 
572
        self.bus = dbus.SystemBus()
 
573
        mandos_dbus_objc = self.bus.get_object(
 
574
            self.busname, "/", follow_name_owner_changes=True)
 
575
        self.mandos_serv = dbus.Interface(mandos_dbus_objc,
 
576
                                          dbus_interface
 
577
                                          = server_interface)
 
578
        try:
 
579
            mandos_clients = (self.mandos_serv
 
580
                              .GetAllClientsWithProperties())
 
581
            if not mandos_clients:
 
582
                self.log_message_raw(("bold", "Note: Server has no clients."))
 
583
        except dbus.exceptions.DBusException:
 
584
            self.log_message_raw(("bold", "Note: No Mandos server running."))
 
585
            mandos_clients = dbus.Dictionary()
 
586
        
 
587
        (self.mandos_serv
 
588
         .connect_to_signal("ClientRemoved",
 
589
                            self.find_and_remove_client,
 
590
                            dbus_interface=server_interface,
 
591
                            byte_arrays=True))
 
592
        (self.mandos_serv
 
593
         .connect_to_signal("ClientAdded",
 
594
                            self.add_new_client,
 
595
                            dbus_interface=server_interface,
 
596
                            byte_arrays=True))
 
597
        (self.mandos_serv
 
598
         .connect_to_signal("ClientNotFound",
 
599
                            self.client_not_found,
 
600
                            dbus_interface=server_interface,
 
601
                            byte_arrays=True))
 
602
        for path, client in mandos_clients.items():
 
603
            client_proxy_object = self.bus.get_object(self.busname,
 
604
                                                      path)
 
605
            self.add_client(MandosClientWidget(server_proxy_object
 
606
                                               =self.mandos_serv,
 
607
                                               proxy_object
 
608
                                               =client_proxy_object,
 
609
                                               properties=client,
 
610
                                               update_hook
 
611
                                               =self.refresh,
 
612
                                               delete_hook
 
613
                                               =self.remove_client,
 
614
                                               logger
 
615
                                               =self.log_message),
 
616
                            path=path)
 
617
        
652
618
        self.refresh()
653
619
        self._input_callback_tag = (gobject.io_add_watch
654
620
                                    (sys.stdin.fileno(),
751
717
    ui.run()
752
718
except KeyboardInterrupt:
753
719
    ui.screen.stop()
754
 
except Exception, e:
755
 
    ui.log_message(unicode(e))
 
720
except Exception as e:
 
721
    ui.log_message(str(e))
756
722
    ui.screen.stop()
757
723
    raise