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  • Committer: Teddy Hogeborn
  • Date: 2015-07-09 08:57:02 UTC
  • mto: (237.7.594 trunk)
  • mto: This revision was merged to the branch mainline in revision 325.
  • Revision ID: teddy@recompile.se-20150709085702-7bsl6191yo2eusik
initramfs-tools-hook: Use Diffie-Hellman parameters file if available.

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mandos-monitor
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# 
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# Mandos Monitor - Control and monitor the Mandos server
5
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# 
6
 
# Copyright © 2009-2012 Teddy Hogeborn
7
 
# Copyright © 2009-2012 Björn Påhlsson
 
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# Copyright © 2009-2015 Teddy Hogeborn
 
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# Copyright © 2009-2015 Björn Påhlsson
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# 
9
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# 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
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#     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.major == 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 = "1.5.3"
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 = "1.6.9"
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
 
            self.proxy.connect_to_signal("PropertyChanged",
92
 
                                         self.property_changed,
93
 
                                         client_interface,
 
90
            self.proxy.connect_to_signal("PropertiesChanged",
 
91
                                         self.properties_changed,
 
92
                                         dbus.PROPERTIES_IFACE,
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)
103
102
    
104
 
    def property_changed(self, property=None, value=None):
105
 
        """This is called whenever we get a PropertyChanged signal
106
 
        It updates the changed property in the "properties" dict.
 
103
    def properties_changed(self, interface, properties, invalidated):
 
104
        """This is called whenever we get a PropertiesChanged signal
 
105
        It updates the changed properties in the "properties" dict.
107
106
        """
108
107
        # Update properties dict with new value
109
 
        self.properties[property] = value
 
108
        self.properties.update(properties)
110
109
    
111
 
    def delete(self, *args, **kwargs):
 
110
    def delete(self):
112
111
        self.property_changed_match.remove()
113
 
        super(MandosClientPropertyCache, self).__init__(
114
 
            *args, **kwargs)
115
112
 
116
113
 
117
114
class MandosClientWidget(urwid.FlowWidget, MandosClientPropertyCache):
119
116
    """
120
117
    
121
118
    def __init__(self, server_proxy_object=None, update_hook=None,
122
 
                 delete_hook=None, logger=None, *args, **kwargs):
 
119
                 delete_hook=None, logger=None, **kwargs):
123
120
        # Called on update
124
121
        self.update_hook = update_hook
125
122
        # Called on delete
130
127
        self.logger = logger
131
128
        
132
129
        self._update_timer_callback_tag = None
133
 
        self._update_timer_callback_lock = 0
134
130
        
135
131
        # The widget shown normally
136
132
        self._text_widget = urwid.Text("")
137
133
        # The widget shown when we have focus
138
134
        self._focus_text_widget = urwid.Text("")
139
 
        super(MandosClientWidget, self).__init__(
140
 
            update_hook=update_hook, delete_hook=delete_hook,
141
 
            *args, **kwargs)
 
135
        super(MandosClientWidget, self).__init__(**kwargs)
142
136
        self.update()
143
137
        self.opened = False
144
138
        
145
 
        last_checked_ok = isoformat_to_datetime(self.properties
146
 
                                                ["LastCheckedOK"])
147
 
        
148
 
        if self.properties ["LastCheckerStatus"] != 0:
149
 
            self.using_timer(True)
150
 
        
151
 
        if self.need_approval:
152
 
            self.using_timer(True)
153
 
        
154
139
        self.match_objects = (
155
140
            self.proxy.connect_to_signal("CheckerCompleted",
156
141
                                         self.checker_completed,
172
157
                                         self.rejected,
173
158
                                         client_interface,
174
159
                                         byte_arrays=True))
175
 
        #self.logger('Created client %s' % (self.properties["Name"]))
176
 
    
177
 
    def property_changed(self, property=None, value=None):
178
 
        super(self, MandosClientWidget).property_changed(property,
179
 
                                                         value)
180
 
        if property == "ApprovalPending":
181
 
            using_timer(bool(value))
182
 
        if property == "LastCheckerStatus":
183
 
            using_timer(value != 0)
184
 
            #self.logger('Checker for client %s (command "%s")'
185
 
            #            ' was successful'
186
 
            #            % (self.properties["Name"], command))
 
160
        self.logger('Created client {}'
 
161
                    .format(self.properties["Name"]), level=0)
187
162
    
188
163
    def using_timer(self, flag):
189
164
        """Call this method with True or False when timer should be
190
165
        activated or deactivated.
191
166
        """
192
 
        old = self._update_timer_callback_lock
193
 
        if flag:
194
 
            self._update_timer_callback_lock += 1
195
 
        else:
196
 
            self._update_timer_callback_lock -= 1
197
 
        if old == 0 and self._update_timer_callback_lock:
 
167
        if flag and self._update_timer_callback_tag is None:
198
168
            # Will update the shown timer value every second
199
169
            self._update_timer_callback_tag = (gobject.timeout_add
200
170
                                               (1000,
201
171
                                                self.update_timer))
202
 
        elif old and self._update_timer_callback_lock == 0:
 
172
        elif not (flag or self._update_timer_callback_tag is None):
203
173
            gobject.source_remove(self._update_timer_callback_tag)
204
174
            self._update_timer_callback_tag = None
205
175
    
206
 
    def checker_completed(self, exitstatus, condition, command):
 
176
    def checker_completed(self, exitstatus, signal, command):
207
177
        if exitstatus == 0:
 
178
            self.logger('Checker for client {} (command "{}")'
 
179
                        ' succeeded'.format(self.properties["Name"],
 
180
                                            command), level=0)
208
181
            self.update()
209
182
            return
210
183
        # Checker failed
211
 
        if os.WIFEXITED(condition):
212
 
            self.logger('Checker for client %s (command "%s")'
213
 
                        ' failed with exit code %s'
214
 
                        % (self.properties["Name"], command,
215
 
                           os.WEXITSTATUS(condition)))
216
 
        elif os.WIFSIGNALED(condition):
217
 
            self.logger('Checker for client %s (command "%s")'
218
 
                        ' was killed by signal %s'
219
 
                        % (self.properties["Name"], command,
220
 
                           os.WTERMSIG(condition)))
221
 
        elif os.WCOREDUMP(condition):
222
 
            self.logger('Checker for client %s (command "%s")'
223
 
                        ' dumped core'
224
 
                        % (self.properties["Name"], command))
 
184
        if exitstatus >= 0:
 
185
            self.logger('Checker for client {} (command "{}") failed'
 
186
                        ' with exit code {}'
 
187
                        .format(self.properties["Name"], command,
 
188
                                exitstatus))
 
189
        elif signal != 0:
 
190
            self.logger('Checker for client {} (command "{}") was'
 
191
                        ' killed by signal {}'
 
192
                        .format(self.properties["Name"], command,
 
193
                                signal))
225
194
        else:
226
 
            self.logger('Checker for client %s completed'
227
 
                        ' mysteriously')
 
195
            self.logger('Checker for client {} completed'
 
196
                        ' mysteriously'
 
197
                        .format(self.properties["Name"]))
228
198
        self.update()
229
199
    
230
200
    def checker_started(self, command):
231
 
        """Server signals that a checker started. This could be useful
232
 
           to log in the future. """
233
 
        #self.logger('Client %s started checker "%s"'
234
 
        #            % (self.properties["Name"], unicode(command)))
235
 
        pass
 
201
        """Server signals that a checker started."""
 
202
        self.logger('Client {} started checker "{}"'
 
203
                    .format(self.properties["Name"],
 
204
                            command), level=0)
236
205
    
237
206
    def got_secret(self):
238
 
        self.logger('Client %s received its secret'
239
 
                    % self.properties["Name"])
 
207
        self.logger('Client {} received its secret'
 
208
                    .format(self.properties["Name"]))
240
209
    
241
210
    def need_approval(self, timeout, default):
242
211
        if not default:
243
 
            message = 'Client %s needs approval within %s seconds'
 
212
            message = 'Client {} needs approval within {} seconds'
244
213
        else:
245
 
            message = 'Client %s will get its secret in %s seconds'
246
 
        self.logger(message
247
 
                    % (self.properties["Name"], timeout/1000))
248
 
        self.using_timer(True)
 
214
            message = 'Client {} will get its secret in {} seconds'
 
215
        self.logger(message.format(self.properties["Name"],
 
216
                                   timeout/1000))
249
217
    
250
218
    def rejected(self, reason):
251
 
        self.logger('Client %s was rejected; reason: %s'
252
 
                    % (self.properties["Name"], reason))
 
219
        self.logger('Client {} was rejected; reason: {}'
 
220
                    .format(self.properties["Name"], reason))
253
221
    
254
222
    def selectable(self):
255
223
        """Make this a "selectable" widget.
277
245
                          "bold-underline-blink":
278
246
                              "bold-underline-blink-standout",
279
247
                          }
280
 
 
 
248
        
281
249
        # Rebuild focus and non-focus widgets using current properties
282
 
 
 
250
        
283
251
        # Base part of a client. Name!
284
 
        base = ('%(name)s: '
285
 
                      % {"name": self.properties["Name"]})
 
252
        base = '{name}: '.format(name=self.properties["Name"])
286
253
        if not self.properties["Enabled"]:
287
254
            message = "DISABLED"
 
255
            self.using_timer(False)
288
256
        elif self.properties["ApprovalPending"]:
289
257
            timeout = datetime.timedelta(milliseconds
290
258
                                         = self.properties
292
260
            last_approval_request = isoformat_to_datetime(
293
261
                self.properties["LastApprovalRequest"])
294
262
            if last_approval_request is not None:
295
 
                timer = timeout - (datetime.datetime.utcnow()
296
 
                                   - last_approval_request)
 
263
                timer = max(timeout - (datetime.datetime.utcnow()
 
264
                                       - last_approval_request),
 
265
                            datetime.timedelta())
297
266
            else:
298
267
                timer = datetime.timedelta()
299
268
            if self.properties["ApprovedByDefault"]:
300
 
                message = "Approval in %s. (d)eny?"
 
269
                message = "Approval in {}. (d)eny?"
301
270
            else:
302
 
                message = "Denial in %s. (a)pprove?"
303
 
            message = message % unicode(timer).rsplit(".", 1)[0]
 
271
                message = "Denial in {}. (a)pprove?"
 
272
            message = message.format(str(timer).rsplit(".", 1)[0])
 
273
            self.using_timer(True)
304
274
        elif self.properties["LastCheckerStatus"] != 0:
305
 
            # When checker has failed, print a timer until client expires
 
275
            # When checker has failed, show timer until client expires
306
276
            expires = self.properties["Expires"]
307
277
            if expires == "":
308
278
                timer = datetime.timedelta(0)
309
279
            else:
310
 
                expires = datetime.datetime.strptime(expires,
311
 
                                                     '%Y-%m-%dT%H:%M:%S.%f')
312
 
                timer = expires - datetime.datetime.utcnow()
 
280
                expires = (datetime.datetime.strptime
 
281
                           (expires, '%Y-%m-%dT%H:%M:%S.%f'))
 
282
                timer = max(expires - datetime.datetime.utcnow(),
 
283
                            datetime.timedelta())
313
284
            message = ('A checker has failed! Time until client'
314
 
                       ' gets disabled: %s'
315
 
                           % unicode(timer).rsplit(".", 1)[0])
 
285
                       ' gets disabled: {}'
 
286
                       .format(str(timer).rsplit(".", 1)[0]))
 
287
            self.using_timer(True)
316
288
        else:
317
289
            message = "enabled"
318
 
        self._text = "%s%s" % (base, message)
319
 
            
 
290
            self.using_timer(False)
 
291
        self._text = "{}{}".format(base, message)
 
292
        
320
293
        if not urwid.supports_unicode():
321
294
            self._text = self._text.encode("ascii", "replace")
322
295
        textlist = [("normal", self._text)]
339
312
        self.update()
340
313
        return True             # Keep calling this
341
314
    
342
 
    def delete(self, *args, **kwargs):
 
315
    def delete(self, **kwargs):
343
316
        if self._update_timer_callback_tag is not None:
344
317
            gobject.source_remove(self._update_timer_callback_tag)
345
318
            self._update_timer_callback_tag = None
348
321
        self.match_objects = ()
349
322
        if self.delete_hook is not None:
350
323
            self.delete_hook(self)
351
 
        return super(MandosClientWidget, self).delete(*args, **kwargs)
 
324
        return super(MandosClientWidget, self).delete(**kwargs)
352
325
    
353
326
    def render(self, maxcolrow, focus=False):
354
327
        """Render differently if we have focus.
396
369
        else:
397
370
            return key
398
371
    
399
 
    def property_changed(self, property=None, value=None,
400
 
                         *args, **kwargs):
401
 
        """Call self.update() if old value is not new value.
 
372
    def properties_changed(self, interface, properties, invalidated):
 
373
        """Call self.update() if any properties changed.
402
374
        This overrides the method from MandosClientPropertyCache"""
403
 
        property_name = unicode(property)
404
 
        old_value = self.properties.get(property_name)
405
 
        super(MandosClientWidget, self).property_changed(
406
 
            property=property, value=value, *args, **kwargs)
407
 
        if self.properties.get(property_name) != old_value:
 
375
        old_values = { key: self.properties.get(key)
 
376
                       for key in properties.keys() }
 
377
        super(MandosClientWidget, self).properties_changed(
 
378
            interface, properties, invalidated)
 
379
        if any(old_values[key] != self.properties.get(key)
 
380
               for key in old_values):
408
381
            self.update()
409
382
 
410
383
 
413
386
    "down" key presses, thus not allowing any containing widgets to
414
387
    use them as an excuse to shift focus away from this widget.
415
388
    """
416
 
    def keypress(self, maxcolrow, key):
417
 
        ret = super(ConstrainedListBox, self).keypress(maxcolrow, key)
 
389
    def keypress(self, *args, **kwargs):
 
390
        ret = super(ConstrainedListBox, self).keypress(*args, **kwargs)
418
391
        if ret in ("up", "down"):
419
392
            return
420
393
        return ret
424
397
    """This is the entire user interface - the whole screen
425
398
    with boxes, lists of client widgets, etc.
426
399
    """
427
 
    def __init__(self, max_log_length=1000):
 
400
    def __init__(self, max_log_length=1000, log_level=1):
428
401
        DBusGMainLoop(set_as_default=True)
429
402
        
430
403
        self.screen = urwid.curses_display.Screen()
433
406
                ("normal",
434
407
                 "default", "default", None),
435
408
                ("bold",
436
 
                 "default", "default", "bold"),
 
409
                 "bold", "default", "bold"),
437
410
                ("underline-blink",
438
 
                 "default", "default", "underline"),
 
411
                 "underline,blink", "default", "underline,blink"),
439
412
                ("standout",
440
 
                 "default", "default", "standout"),
 
413
                 "standout", "default", "standout"),
441
414
                ("bold-underline-blink",
442
 
                 "default", "default", ("bold", "underline")),
 
415
                 "bold,underline,blink", "default", "bold,underline,blink"),
443
416
                ("bold-standout",
444
 
                 "default", "default", ("bold", "standout")),
 
417
                 "bold,standout", "default", "bold,standout"),
445
418
                ("underline-blink-standout",
446
 
                 "default", "default", ("underline", "standout")),
 
419
                 "underline,blink,standout", "default",
 
420
                 "underline,blink,standout"),
447
421
                ("bold-underline-blink-standout",
448
 
                 "default", "default", ("bold", "underline",
449
 
                                          "standout")),
 
422
                 "bold,underline,blink,standout", "default",
 
423
                 "bold,underline,blink,standout"),
450
424
                ))
451
425
        
452
426
        if urwid.supports_unicode():
467
441
        self.log = []
468
442
        self.max_log_length = max_log_length
469
443
        
 
444
        self.log_level = log_level
 
445
        
470
446
        # We keep a reference to the log widget so we can remove it
471
447
        # from the ListWalker without it getting destroyed
472
448
        self.logbox = ConstrainedListBox(self.log)
486
462
        self.main_loop = gobject.MainLoop()
487
463
    
488
464
    def client_not_found(self, fingerprint, address):
489
 
        self.log_message(("Client with address %s and fingerprint %s"
490
 
                          " could not be found" % (address,
491
 
                                                    fingerprint)))
 
465
        self.log_message("Client with address {} and fingerprint {}"
 
466
                         " could not be found"
 
467
                         .format(address, fingerprint))
492
468
    
493
469
    def rebuild(self):
494
470
        """This rebuilds the User Interface.
506
482
            self.uilist.append(self.logbox)
507
483
        self.topwidget = urwid.Pile(self.uilist)
508
484
    
509
 
    def log_message(self, message):
 
485
    def log_message(self, message, level=1):
 
486
        """Log message formatted with timestamp"""
 
487
        if level < self.log_level:
 
488
            return
510
489
        timestamp = datetime.datetime.now().isoformat()
511
 
        self.log_message_raw(timestamp + ": " + message)
 
490
        self.log_message_raw("{}: {}".format(timestamp, message),
 
491
                             level=level)
512
492
    
513
 
    def log_message_raw(self, markup):
 
493
    def log_message_raw(self, markup, level=1):
514
494
        """Add a log message to the log buffer."""
 
495
        if level < self.log_level:
 
496
            return
515
497
        self.log.append(urwid.Text(markup, wrap=self.log_wrap))
516
498
        if (self.max_log_length
517
499
            and len(self.log) > self.max_log_length):
524
506
        """Toggle visibility of the log buffer."""
525
507
        self.log_visible = not self.log_visible
526
508
        self.rebuild()
527
 
        #self.log_message("Log visibility changed to: "
528
 
        #                 + unicode(self.log_visible))
 
509
        self.log_message("Log visibility changed to: {}"
 
510
                         .format(self.log_visible), level=0)
529
511
    
530
512
    def change_log_display(self):
531
513
        """Change type of log display.
536
518
            self.log_wrap = "clip"
537
519
        for textwidget in self.log:
538
520
            textwidget.set_wrap_mode(self.log_wrap)
539
 
        #self.log_message("Wrap mode: " + self.log_wrap)
 
521
        self.log_message("Wrap mode: {}".format(self.log_wrap),
 
522
                         level=0)
540
523
    
541
524
    def find_and_remove_client(self, path, name):
542
525
        """Find a client by its object path and remove it.
547
530
            client = self.clients_dict[path]
548
531
        except KeyError:
549
532
            # not found?
550
 
            self.log_message("Unknown client %r (%r) removed", name,
551
 
                             path)
 
533
            self.log_message("Unknown client {!r} ({!r}) removed"
 
534
                             .format(name, path))
552
535
            return
553
536
        client.delete()
554
537
    
571
554
        if path is None:
572
555
            path = client.proxy.object_path
573
556
        self.clients_dict[path] = client
574
 
        self.clients.sort(None, lambda c: c.properties["Name"])
 
557
        self.clients.sort(key=lambda c: c.properties["Name"])
575
558
        self.refresh()
576
559
    
577
560
    def remove_client(self, client, path=None):
579
562
        if path is None:
580
563
            path = client.proxy.object_path
581
564
        del self.clients_dict[path]
582
 
        if not self.clients_dict:
583
 
            # Work around bug in Urwid 0.9.8.3 - if a SimpleListWalker
584
 
            # is completely emptied, we need to recreate it.
585
 
            self.clients = urwid.SimpleListWalker([])
586
 
            self.rebuild()
587
565
        self.refresh()
588
566
    
589
567
    def refresh(self):
602
580
        try:
603
581
            mandos_clients = (self.mandos_serv
604
582
                              .GetAllClientsWithProperties())
 
583
            if not mandos_clients:
 
584
                self.log_message_raw(("bold", "Note: Server has no clients."))
605
585
        except dbus.exceptions.DBusException:
 
586
            self.log_message_raw(("bold", "Note: No Mandos server running."))
606
587
            mandos_clients = dbus.Dictionary()
607
588
        
608
589
        (self.mandos_serv
620
601
                            self.client_not_found,
621
602
                            dbus_interface=server_interface,
622
603
                            byte_arrays=True))
623
 
        for path, client in mandos_clients.iteritems():
 
604
        for path, client in mandos_clients.items():
624
605
            client_proxy_object = self.bus.get_object(self.busname,
625
606
                                                      path)
626
607
            self.add_client(MandosClientWidget(server_proxy_object
635
616
                                               logger
636
617
                                               =self.log_message),
637
618
                            path=path)
638
 
 
 
619
        
639
620
        self.refresh()
640
621
        self._input_callback_tag = (gobject.io_add_watch
641
622
                                    (sys.stdin.fileno(),
673
654
            elif key == "window resize":
674
655
                self.size = self.screen.get_cols_rows()
675
656
                self.refresh()
676
 
            elif key == "\f":  # Ctrl-L
 
657
            elif key == "ctrl l":
 
658
                self.screen.clear()
677
659
                self.refresh()
678
660
            elif key == "l" or key == "D":
679
661
                self.toggle_log_display()
691
673
                                            "?: Help",
692
674
                                            "l: Log window toggle",
693
675
                                            "TAB: Switch window",
694
 
                                            "w: Wrap (log)"))))
 
676
                                            "w: Wrap (log lines)",
 
677
                                            "v: Toggle verbose log",
 
678
                                            ))))
695
679
                self.log_message_raw(("bold",
696
680
                                      "  "
697
681
                                      .join(("Clients:",
710
694
                else:
711
695
                    self.topwidget.set_focus(self.logbox)
712
696
                self.refresh()
 
697
            elif key == "v":
 
698
                if self.log_level == 0:
 
699
                    self.log_level = 1
 
700
                    self.log_message("Verbose mode: Off")
 
701
                else:
 
702
                    self.log_level = 0
 
703
                    self.log_message("Verbose mode: On")
713
704
            #elif (key == "end" or key == "meta >" or key == "G"
714
705
            #      or key == ">"):
715
706
            #    pass            # xxx end-of-buffer
738
729
    ui.run()
739
730
except KeyboardInterrupt:
740
731
    ui.screen.stop()
741
 
except Exception, e:
742
 
    ui.log_message(unicode(e))
 
732
except Exception as e:
 
733
    ui.log_message(str(e))
743
734
    ui.screen.stop()
744
735
    raise