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  • Committer: Teddy Hogeborn
  • Date: 2012-01-08 11:33:39 UTC
  • mfrom: (237.4.26 release)
  • Revision ID: teddy@recompile.se-20120108113339-62jrim6n2p36929s
Merge from release branch.

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mandos-monitor
 
1
#!/usr/bin/python
 
2
# -*- mode: python; coding: utf-8 -*-
 
3
# 
 
4
# Mandos Monitor - Control and monitor the Mandos server
 
5
# 
 
6
# Copyright © 2009-2012 Teddy Hogeborn
 
7
# Copyright © 2009-2012 Björn Påhlsson
 
8
# 
 
9
# This program is free software: you can redistribute it and/or modify
 
10
# it under the terms of the GNU General Public License as published by
 
11
# the Free Software Foundation, either version 3 of the License, or
 
12
# (at your option) any later version.
 
13
#
 
14
#     This program is distributed in the hope that it will be useful,
 
15
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
 
16
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
17
#     GNU General Public License for more details.
 
18
# 
 
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/>.
 
21
# 
 
22
# Contact the authors at <mandos@recompile.se>.
 
23
# 
 
24
 
 
25
from __future__ import (division, absolute_import, print_function,
 
26
                        unicode_literals)
 
27
 
 
28
import sys
 
29
import os
 
30
import signal
 
31
 
 
32
import datetime
 
33
 
 
34
import urwid.curses_display
 
35
import urwid
 
36
 
 
37
from dbus.mainloop.glib import DBusGMainLoop
 
38
import gobject
 
39
 
 
40
import dbus
 
41
 
 
42
import UserList
 
43
 
 
44
import locale
 
45
 
 
46
locale.setlocale(locale.LC_ALL, '')
 
47
 
 
48
import logging
 
49
logging.getLogger('dbus.proxies').setLevel(logging.CRITICAL)
 
50
 
 
51
# Some useful constants
 
52
domain = 'se.recompile'
 
53
server_interface = domain + '.Mandos'
 
54
client_interface = domain + '.Mandos.Client'
 
55
version = "1.5.2"
 
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)
 
64
 
 
65
def isoformat_to_datetime(iso):
 
66
    "Parse an ISO 8601 date string to a datetime.datetime()"
 
67
    if not iso:
 
68
        return None
 
69
    d, t = iso.split("T", 1)
 
70
    year, month, day = d.split("-", 2)
 
71
    hour, minute, second = t.split(":", 2)
 
72
    second, fraction = divmod(float(second), 1)
 
73
    return datetime.datetime(int(year),
 
74
                             int(month),
 
75
                             int(day),
 
76
                             int(hour),
 
77
                             int(minute),
 
78
                             int(second),           # Whole seconds
 
79
                             int(fraction*1000000)) # Microseconds
 
80
 
 
81
class MandosClientPropertyCache(object):
 
82
    """This wraps a Mandos Client D-Bus proxy object, caches the
 
83
    properties and calls a hook function when any of them are
 
84
    changed.
 
85
    """
 
86
    def __init__(self, proxy_object=None, *args, **kwargs):
 
87
        self.proxy = proxy_object # Mandos Client proxy object
 
88
        
 
89
        self.properties = dict()
 
90
        self.property_changed_match = (
 
91
            self.proxy.connect_to_signal("PropertyChanged",
 
92
                                         self.property_changed,
 
93
                                         client_interface,
 
94
                                         byte_arrays=True))
 
95
        
 
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)
 
103
    
 
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.
 
107
        """
 
108
        # Update properties dict with new value
 
109
        self.properties[property] = value
 
110
    
 
111
    def delete(self, *args, **kwargs):
 
112
        self.property_changed_match.remove()
 
113
        super(MandosClientPropertyCache, self).__init__(
 
114
            *args, **kwargs)
 
115
 
 
116
 
 
117
class MandosClientWidget(urwid.FlowWidget, MandosClientPropertyCache):
 
118
    """A Mandos Client which is visible on the screen.
 
119
    """
 
120
    
 
121
    def __init__(self, server_proxy_object=None, update_hook=None,
 
122
                 delete_hook=None, logger=None, *args, **kwargs):
 
123
        # Called on update
 
124
        self.update_hook = update_hook
 
125
        # Called on delete
 
126
        self.delete_hook = delete_hook
 
127
        # Mandos Server proxy object
 
128
        self.server_proxy_object = server_proxy_object
 
129
        # Logger
 
130
        self.logger = logger
 
131
        
 
132
        self._update_timer_callback_tag = None
 
133
        self._update_timer_callback_lock = 0
 
134
        self.last_checker_failed = False
 
135
        
 
136
        # The widget shown normally
 
137
        self._text_widget = urwid.Text("")
 
138
        # The widget shown when we have focus
 
139
        self._focus_text_widget = urwid.Text("")
 
140
        super(MandosClientWidget, self).__init__(
 
141
            update_hook=update_hook, delete_hook=delete_hook,
 
142
            *args, **kwargs)
 
143
        self.update()
 
144
        self.opened = False
 
145
        
 
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
        self.match_objects = (
 
165
            self.proxy.connect_to_signal("CheckerCompleted",
 
166
                                         self.checker_completed,
 
167
                                         client_interface,
 
168
                                         byte_arrays=True),
 
169
            self.proxy.connect_to_signal("CheckerStarted",
 
170
                                         self.checker_started,
 
171
                                         client_interface,
 
172
                                         byte_arrays=True),
 
173
            self.proxy.connect_to_signal("GotSecret",
 
174
                                         self.got_secret,
 
175
                                         client_interface,
 
176
                                         byte_arrays=True),
 
177
            self.proxy.connect_to_signal("NeedApproval",
 
178
                                         self.need_approval,
 
179
                                         client_interface,
 
180
                                         byte_arrays=True),
 
181
            self.proxy.connect_to_signal("Rejected",
 
182
                                         self.rejected,
 
183
                                         client_interface,
 
184
                                         byte_arrays=True))
 
185
        #self.logger('Created client %s' % (self.properties["Name"]))
 
186
    
 
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
    def using_timer(self, flag):
 
194
        """Call this method with True or False when timer should be
 
195
        activated or deactivated.
 
196
        """
 
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:
 
203
            # Will update the shown timer value every second
 
204
            self._update_timer_callback_tag = (gobject.timeout_add
 
205
                                               (1000,
 
206
                                                self.update_timer))
 
207
        elif old and self._update_timer_callback_lock == 0:
 
208
            gobject.source_remove(self._update_timer_callback_tag)
 
209
            self._update_timer_callback_tag = None
 
210
    
 
211
    def checker_completed(self, exitstatus, condition, command):
 
212
        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
            self.update()
 
220
            return
 
221
        # Checker failed
 
222
        if not self.last_checker_failed:
 
223
            self.last_checker_failed = True
 
224
            self.using_timer(True)
 
225
        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)))
 
230
        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)))
 
235
        elif os.WCOREDUMP(condition):
 
236
            self.logger('Checker for client %s (command "%s")'
 
237
                        ' dumped core'
 
238
                        % (self.properties["Name"], command))
 
239
        else:
 
240
            self.logger('Checker for client %s completed'
 
241
                        ' mysteriously')
 
242
        self.update()
 
243
    
 
244
    def checker_started(self, command):
 
245
        """Server signals that a checker started. This could be useful
 
246
           to log in the future. """
 
247
        #self.logger('Client %s started checker "%s"'
 
248
        #            % (self.properties["Name"], unicode(command)))
 
249
        pass
 
250
    
 
251
    def got_secret(self):
 
252
        self.last_checker_failed = False
 
253
        self.logger('Client %s received its secret'
 
254
                    % self.properties["Name"])
 
255
    
 
256
    def need_approval(self, timeout, default):
 
257
        if not default:
 
258
            message = 'Client %s needs approval within %s seconds'
 
259
        else:
 
260
            message = 'Client %s will get its secret in %s seconds'
 
261
        self.logger(message
 
262
                    % (self.properties["Name"], timeout/1000))
 
263
        self.using_timer(True)
 
264
    
 
265
    def rejected(self, reason):
 
266
        self.logger('Client %s was rejected; reason: %s'
 
267
                    % (self.properties["Name"], reason))
 
268
    
 
269
    def selectable(self):
 
270
        """Make this a "selectable" widget.
 
271
        This overrides the method from urwid.FlowWidget."""
 
272
        return True
 
273
    
 
274
    def rows(self, maxcolrow, focus=False):
 
275
        """How many rows this widget will occupy might depend on
 
276
        whether we have focus or not.
 
277
        This overrides the method from urwid.FlowWidget"""
 
278
        return self.current_widget(focus).rows(maxcolrow, focus=focus)
 
279
    
 
280
    def current_widget(self, focus=False):
 
281
        if focus or self.opened:
 
282
            return self._focus_widget
 
283
        return self._widget
 
284
    
 
285
    def update(self):
 
286
        "Called when what is visible on the screen should be updated."
 
287
        # How to add standout mode to a style
 
288
        with_standout = { "normal": "standout",
 
289
                          "bold": "bold-standout",
 
290
                          "underline-blink":
 
291
                              "underline-blink-standout",
 
292
                          "bold-underline-blink":
 
293
                              "bold-underline-blink-standout",
 
294
                          }
 
295
 
 
296
        # Rebuild focus and non-focus widgets using current properties
 
297
 
 
298
        # Base part of a client. Name!
 
299
        base = ('%(name)s: '
 
300
                      % {"name": self.properties["Name"]})
 
301
        if not self.properties["Enabled"]:
 
302
            message = "DISABLED"
 
303
        elif self.properties["ApprovalPending"]:
 
304
            timeout = datetime.timedelta(milliseconds
 
305
                                         = self.properties
 
306
                                         ["ApprovalDelay"])
 
307
            last_approval_request = isoformat_to_datetime(
 
308
                self.properties["LastApprovalRequest"])
 
309
            if last_approval_request is not None:
 
310
                timer = timeout - (datetime.datetime.utcnow()
 
311
                                   - last_approval_request)
 
312
            else:
 
313
                timer = datetime.timedelta()
 
314
            if self.properties["ApprovedByDefault"]:
 
315
                message = "Approval in %s. (d)eny?"
 
316
            else:
 
317
                message = "Denial in %s. (a)pprove?"
 
318
            message = message % unicode(timer).rsplit(".", 1)[0]
 
319
        elif self.last_checker_failed:
 
320
            # When checker has failed, print a timer until client expires
 
321
            expires = self.properties["Expires"]
 
322
            if expires == "":
 
323
                timer = datetime.timedelta(0)
 
324
            else:
 
325
                expires = datetime.datetime.strptime(expires,
 
326
                                                     '%Y-%m-%dT%H:%M:%S.%f')
 
327
                timer = expires - datetime.datetime.utcnow()
 
328
            message = ('A checker has failed! Time until client'
 
329
                       ' gets disabled: %s'
 
330
                           % unicode(timer).rsplit(".", 1)[0])
 
331
        else:
 
332
            message = "enabled"
 
333
        self._text = "%s%s" % (base, message)
 
334
            
 
335
        if not urwid.supports_unicode():
 
336
            self._text = self._text.encode("ascii", "replace")
 
337
        textlist = [("normal", self._text)]
 
338
        self._text_widget.set_text(textlist)
 
339
        self._focus_text_widget.set_text([(with_standout[text[0]],
 
340
                                           text[1])
 
341
                                          if isinstance(text, tuple)
 
342
                                          else text
 
343
                                          for text in textlist])
 
344
        self._widget = self._text_widget
 
345
        self._focus_widget = urwid.AttrWrap(self._focus_text_widget,
 
346
                                            "standout")
 
347
        # Run update hook, if any
 
348
        if self.update_hook is not None:
 
349
            self.update_hook()
 
350
    
 
351
    def update_timer(self):
 
352
        """called by gobject. Will indefinitely loop until
 
353
        gobject.source_remove() on tag is called"""
 
354
        self.update()
 
355
        return True             # Keep calling this
 
356
    
 
357
    def delete(self, *args, **kwargs):
 
358
        if self._update_timer_callback_tag is not None:
 
359
            gobject.source_remove(self._update_timer_callback_tag)
 
360
            self._update_timer_callback_tag = None
 
361
        for match in self.match_objects:
 
362
            match.remove()
 
363
        self.match_objects = ()
 
364
        if self.delete_hook is not None:
 
365
            self.delete_hook(self)
 
366
        return super(MandosClientWidget, self).delete(*args, **kwargs)
 
367
    
 
368
    def render(self, maxcolrow, focus=False):
 
369
        """Render differently if we have focus.
 
370
        This overrides the method from urwid.FlowWidget"""
 
371
        return self.current_widget(focus).render(maxcolrow,
 
372
                                                 focus=focus)
 
373
    
 
374
    def keypress(self, maxcolrow, key):
 
375
        """Handle keys.
 
376
        This overrides the method from urwid.FlowWidget"""
 
377
        if key == "+":
 
378
            self.proxy.Enable(dbus_interface = client_interface,
 
379
                              ignore_reply=True)
 
380
        elif key == "-":
 
381
            self.proxy.Disable(dbus_interface = client_interface,
 
382
                               ignore_reply=True)
 
383
        elif key == "a":
 
384
            self.proxy.Approve(dbus.Boolean(True, variant_level=1),
 
385
                               dbus_interface = client_interface,
 
386
                               ignore_reply=True)
 
387
        elif key == "d":
 
388
            self.proxy.Approve(dbus.Boolean(False, variant_level=1),
 
389
                                  dbus_interface = client_interface,
 
390
                               ignore_reply=True)
 
391
        elif key == "R" or key == "_" or key == "ctrl k":
 
392
            self.server_proxy_object.RemoveClient(self.proxy
 
393
                                                  .object_path,
 
394
                                                  ignore_reply=True)
 
395
        elif key == "s":
 
396
            self.proxy.StartChecker(dbus_interface = client_interface,
 
397
                                    ignore_reply=True)
 
398
        elif key == "S":
 
399
            self.proxy.StopChecker(dbus_interface = client_interface,
 
400
                                   ignore_reply=True)
 
401
        elif key == "C":
 
402
            self.proxy.CheckedOK(dbus_interface = client_interface,
 
403
                                 ignore_reply=True)
 
404
        # xxx
 
405
#         elif key == "p" or key == "=":
 
406
#             self.proxy.pause()
 
407
#         elif key == "u" or key == ":":
 
408
#             self.proxy.unpause()
 
409
#         elif key == "RET":
 
410
#             self.open()
 
411
        else:
 
412
            return key
 
413
    
 
414
    def property_changed(self, property=None, value=None,
 
415
                         *args, **kwargs):
 
416
        """Call self.update() if old value is not new value.
 
417
        This overrides the method from MandosClientPropertyCache"""
 
418
        property_name = unicode(property)
 
419
        old_value = self.properties.get(property_name)
 
420
        super(MandosClientWidget, self).property_changed(
 
421
            property=property, value=value, *args, **kwargs)
 
422
        if self.properties.get(property_name) != old_value:
 
423
            self.update()
 
424
 
 
425
 
 
426
class ConstrainedListBox(urwid.ListBox):
 
427
    """Like a normal urwid.ListBox, but will consume all "up" or
 
428
    "down" key presses, thus not allowing any containing widgets to
 
429
    use them as an excuse to shift focus away from this widget.
 
430
    """
 
431
    def keypress(self, maxcolrow, key):
 
432
        ret = super(ConstrainedListBox, self).keypress(maxcolrow, key)
 
433
        if ret in ("up", "down"):
 
434
            return
 
435
        return ret
 
436
 
 
437
 
 
438
class UserInterface(object):
 
439
    """This is the entire user interface - the whole screen
 
440
    with boxes, lists of client widgets, etc.
 
441
    """
 
442
    def __init__(self, max_log_length=1000):
 
443
        DBusGMainLoop(set_as_default=True)
 
444
        
 
445
        self.screen = urwid.curses_display.Screen()
 
446
        
 
447
        self.screen.register_palette((
 
448
                ("normal",
 
449
                 "default", "default", None),
 
450
                ("bold",
 
451
                 "default", "default", "bold"),
 
452
                ("underline-blink",
 
453
                 "default", "default", "underline"),
 
454
                ("standout",
 
455
                 "default", "default", "standout"),
 
456
                ("bold-underline-blink",
 
457
                 "default", "default", ("bold", "underline")),
 
458
                ("bold-standout",
 
459
                 "default", "default", ("bold", "standout")),
 
460
                ("underline-blink-standout",
 
461
                 "default", "default", ("underline", "standout")),
 
462
                ("bold-underline-blink-standout",
 
463
                 "default", "default", ("bold", "underline",
 
464
                                          "standout")),
 
465
                ))
 
466
        
 
467
        if urwid.supports_unicode():
 
468
            self.divider = "─" # \u2500
 
469
            #self.divider = "━" # \u2501
 
470
        else:
 
471
            #self.divider = "-" # \u002d
 
472
            self.divider = "_" # \u005f
 
473
        
 
474
        self.screen.start()
 
475
        
 
476
        self.size = self.screen.get_cols_rows()
 
477
        
 
478
        self.clients = urwid.SimpleListWalker([])
 
479
        self.clients_dict = {}
 
480
        
 
481
        # We will add Text widgets to this list
 
482
        self.log = []
 
483
        self.max_log_length = max_log_length
 
484
        
 
485
        # We keep a reference to the log widget so we can remove it
 
486
        # from the ListWalker without it getting destroyed
 
487
        self.logbox = ConstrainedListBox(self.log)
 
488
        
 
489
        # This keeps track of whether self.uilist currently has
 
490
        # self.logbox in it or not
 
491
        self.log_visible = True
 
492
        self.log_wrap = "any"
 
493
        
 
494
        self.rebuild()
 
495
        self.log_message_raw(("bold",
 
496
                              "Mandos Monitor version " + version))
 
497
        self.log_message_raw(("bold",
 
498
                              "q: Quit  ?: Help"))
 
499
        
 
500
        self.busname = domain + '.Mandos'
 
501
        self.main_loop = gobject.MainLoop()
 
502
    
 
503
    def client_not_found(self, fingerprint, address):
 
504
        self.log_message(("Client with address %s and fingerprint %s"
 
505
                          " could not be found" % (address,
 
506
                                                    fingerprint)))
 
507
    
 
508
    def rebuild(self):
 
509
        """This rebuilds the User Interface.
 
510
        Call this when the widget layout needs to change"""
 
511
        self.uilist = []
 
512
        #self.uilist.append(urwid.ListBox(self.clients))
 
513
        self.uilist.append(urwid.Frame(ConstrainedListBox(self.
 
514
                                                          clients),
 
515
                                       #header=urwid.Divider(),
 
516
                                       header=None,
 
517
                                       footer=
 
518
                                       urwid.Divider(div_char=
 
519
                                                     self.divider)))
 
520
        if self.log_visible:
 
521
            self.uilist.append(self.logbox)
 
522
        self.topwidget = urwid.Pile(self.uilist)
 
523
    
 
524
    def log_message(self, message):
 
525
        timestamp = datetime.datetime.now().isoformat()
 
526
        self.log_message_raw(timestamp + ": " + message)
 
527
    
 
528
    def log_message_raw(self, markup):
 
529
        """Add a log message to the log buffer."""
 
530
        self.log.append(urwid.Text(markup, wrap=self.log_wrap))
 
531
        if (self.max_log_length
 
532
            and len(self.log) > self.max_log_length):
 
533
            del self.log[0:len(self.log)-self.max_log_length-1]
 
534
        self.logbox.set_focus(len(self.logbox.body.contents),
 
535
                              coming_from="above")
 
536
        self.refresh()
 
537
    
 
538
    def toggle_log_display(self):
 
539
        """Toggle visibility of the log buffer."""
 
540
        self.log_visible = not self.log_visible
 
541
        self.rebuild()
 
542
        #self.log_message("Log visibility changed to: "
 
543
        #                 + unicode(self.log_visible))
 
544
    
 
545
    def change_log_display(self):
 
546
        """Change type of log display.
 
547
        Currently, this toggles wrapping of text lines."""
 
548
        if self.log_wrap == "clip":
 
549
            self.log_wrap = "any"
 
550
        else:
 
551
            self.log_wrap = "clip"
 
552
        for textwidget in self.log:
 
553
            textwidget.set_wrap_mode(self.log_wrap)
 
554
        #self.log_message("Wrap mode: " + self.log_wrap)
 
555
    
 
556
    def find_and_remove_client(self, path, name):
 
557
        """Find a client by its object path and remove it.
 
558
        
 
559
        This is connected to the ClientRemoved signal from the
 
560
        Mandos server object."""
 
561
        try:
 
562
            client = self.clients_dict[path]
 
563
        except KeyError:
 
564
            # not found?
 
565
            self.log_message("Unknown client %r (%r) removed", name,
 
566
                             path)
 
567
            return
 
568
        client.delete()
 
569
    
 
570
    def add_new_client(self, path):
 
571
        client_proxy_object = self.bus.get_object(self.busname, path)
 
572
        self.add_client(MandosClientWidget(server_proxy_object
 
573
                                           =self.mandos_serv,
 
574
                                           proxy_object
 
575
                                           =client_proxy_object,
 
576
                                           update_hook
 
577
                                           =self.refresh,
 
578
                                           delete_hook
 
579
                                           =self.remove_client,
 
580
                                           logger
 
581
                                           =self.log_message),
 
582
                        path=path)
 
583
    
 
584
    def add_client(self, client, path=None):
 
585
        self.clients.append(client)
 
586
        if path is None:
 
587
            path = client.proxy.object_path
 
588
        self.clients_dict[path] = client
 
589
        self.clients.sort(None, lambda c: c.properties["Name"])
 
590
        self.refresh()
 
591
    
 
592
    def remove_client(self, client, path=None):
 
593
        self.clients.remove(client)
 
594
        if path is None:
 
595
            path = client.proxy.object_path
 
596
        del self.clients_dict[path]
 
597
        if not self.clients_dict:
 
598
            # Work around bug in Urwid 0.9.8.3 - if a SimpleListWalker
 
599
            # is completely emptied, we need to recreate it.
 
600
            self.clients = urwid.SimpleListWalker([])
 
601
            self.rebuild()
 
602
        self.refresh()
 
603
    
 
604
    def refresh(self):
 
605
        """Redraw the screen"""
 
606
        canvas = self.topwidget.render(self.size, focus=True)
 
607
        self.screen.draw_screen(self.size, canvas)
 
608
    
 
609
    def run(self):
 
610
        """Start the main loop and exit when it's done."""
 
611
        self.bus = dbus.SystemBus()
 
612
        mandos_dbus_objc = self.bus.get_object(
 
613
            self.busname, "/", follow_name_owner_changes=True)
 
614
        self.mandos_serv = dbus.Interface(mandos_dbus_objc,
 
615
                                          dbus_interface
 
616
                                          = server_interface)
 
617
        try:
 
618
            mandos_clients = (self.mandos_serv
 
619
                              .GetAllClientsWithProperties())
 
620
        except dbus.exceptions.DBusException:
 
621
            mandos_clients = dbus.Dictionary()
 
622
        
 
623
        (self.mandos_serv
 
624
         .connect_to_signal("ClientRemoved",
 
625
                            self.find_and_remove_client,
 
626
                            dbus_interface=server_interface,
 
627
                            byte_arrays=True))
 
628
        (self.mandos_serv
 
629
         .connect_to_signal("ClientAdded",
 
630
                            self.add_new_client,
 
631
                            dbus_interface=server_interface,
 
632
                            byte_arrays=True))
 
633
        (self.mandos_serv
 
634
         .connect_to_signal("ClientNotFound",
 
635
                            self.client_not_found,
 
636
                            dbus_interface=server_interface,
 
637
                            byte_arrays=True))
 
638
        for path, client in mandos_clients.iteritems():
 
639
            client_proxy_object = self.bus.get_object(self.busname,
 
640
                                                      path)
 
641
            self.add_client(MandosClientWidget(server_proxy_object
 
642
                                               =self.mandos_serv,
 
643
                                               proxy_object
 
644
                                               =client_proxy_object,
 
645
                                               properties=client,
 
646
                                               update_hook
 
647
                                               =self.refresh,
 
648
                                               delete_hook
 
649
                                               =self.remove_client,
 
650
                                               logger
 
651
                                               =self.log_message),
 
652
                            path=path)
 
653
 
 
654
        self.refresh()
 
655
        self._input_callback_tag = (gobject.io_add_watch
 
656
                                    (sys.stdin.fileno(),
 
657
                                     gobject.IO_IN,
 
658
                                     self.process_input))
 
659
        self.main_loop.run()
 
660
        # Main loop has finished, we should close everything now
 
661
        gobject.source_remove(self._input_callback_tag)
 
662
        self.screen.stop()
 
663
    
 
664
    def stop(self):
 
665
        self.main_loop.quit()
 
666
    
 
667
    def process_input(self, source, condition):
 
668
        keys = self.screen.get_input()
 
669
        translations = { "ctrl n": "down",      # Emacs
 
670
                         "ctrl p": "up",        # Emacs
 
671
                         "ctrl v": "page down", # Emacs
 
672
                         "meta v": "page up",   # Emacs
 
673
                         " ": "page down",      # less
 
674
                         "f": "page down",      # less
 
675
                         "b": "page up",        # less
 
676
                         "j": "down",           # vi
 
677
                         "k": "up",             # vi
 
678
                         }
 
679
        for key in keys:
 
680
            try:
 
681
                key = translations[key]
 
682
            except KeyError:    # :-)
 
683
                pass
 
684
            
 
685
            if key == "q" or key == "Q":
 
686
                self.stop()
 
687
                break
 
688
            elif key == "window resize":
 
689
                self.size = self.screen.get_cols_rows()
 
690
                self.refresh()
 
691
            elif key == "\f":  # Ctrl-L
 
692
                self.refresh()
 
693
            elif key == "l" or key == "D":
 
694
                self.toggle_log_display()
 
695
                self.refresh()
 
696
            elif key == "w" or key == "i":
 
697
                self.change_log_display()
 
698
                self.refresh()
 
699
            elif key == "?" or key == "f1" or key == "esc":
 
700
                if not self.log_visible:
 
701
                    self.log_visible = True
 
702
                    self.rebuild()
 
703
                self.log_message_raw(("bold",
 
704
                                      "  ".
 
705
                                      join(("q: Quit",
 
706
                                            "?: Help",
 
707
                                            "l: Log window toggle",
 
708
                                            "TAB: Switch window",
 
709
                                            "w: Wrap (log)"))))
 
710
                self.log_message_raw(("bold",
 
711
                                      "  "
 
712
                                      .join(("Clients:",
 
713
                                             "+: Enable",
 
714
                                             "-: Disable",
 
715
                                             "R: Remove",
 
716
                                             "s: Start new checker",
 
717
                                             "S: Stop checker",
 
718
                                             "C: Checker OK",
 
719
                                             "a: Approve",
 
720
                                             "d: Deny"))))
 
721
                self.refresh()
 
722
            elif key == "tab":
 
723
                if self.topwidget.get_focus() is self.logbox:
 
724
                    self.topwidget.set_focus(0)
 
725
                else:
 
726
                    self.topwidget.set_focus(self.logbox)
 
727
                self.refresh()
 
728
            #elif (key == "end" or key == "meta >" or key == "G"
 
729
            #      or key == ">"):
 
730
            #    pass            # xxx end-of-buffer
 
731
            #elif (key == "home" or key == "meta <" or key == "g"
 
732
            #      or key == "<"):
 
733
            #    pass            # xxx beginning-of-buffer
 
734
            #elif key == "ctrl e" or key == "$":
 
735
            #    pass            # xxx move-end-of-line
 
736
            #elif key == "ctrl a" or key == "^":
 
737
            #    pass            # xxx move-beginning-of-line
 
738
            #elif key == "ctrl b" or key == "meta (" or key == "h":
 
739
            #    pass            # xxx left
 
740
            #elif key == "ctrl f" or key == "meta )" or key == "l":
 
741
            #    pass            # xxx right
 
742
            #elif key == "a":
 
743
            #    pass            # scroll up log
 
744
            #elif key == "z":
 
745
            #    pass            # scroll down log
 
746
            elif self.topwidget.selectable():
 
747
                self.topwidget.keypress(self.size, key)
 
748
                self.refresh()
 
749
        return True
 
750
 
 
751
ui = UserInterface()
 
752
try:
 
753
    ui.run()
 
754
except KeyboardInterrupt:
 
755
    ui.screen.stop()
 
756
except Exception, e:
 
757
    ui.log_message(unicode(e))
 
758
    ui.screen.stop()
 
759
    raise